korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-13 22:14:20 +08:00
Code Issues Packages Projects Releases Wiki Activity
51d0a2b4cf
linux/drivers/infiniband/core/uverbs_ioctl.c

629 lines
18 KiB
C
Raw Normal View History

IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
/*
* Copyright (c) 2017, Mellanox Technologies inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <rdma/rdma_user_ioctl.h>
#include <rdma/uverbs_ioctl.h>
#include "rdma_core.h"
#include "uverbs.h"
IB/uverbs: Add a simple allocator to uverbs_attr_bundle This is similar in spirit to devm, it keeps track of any allocations linked to this method call and ensures they are all freed when the method exits. Further, if there is space in the internal/onstack buffer then the allocator will hand out that memory and avoid an expensive call to kalloc/kfree in the syscall path. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:40 +08:00
struct bundle_alloc_head {
struct bundle_alloc_head *next;
u8 data[];
};
IB/uverbs: Provide implementation private memory for the uverbs_attr_bundle This already existed as the anonymous 'ctx' structure, but this was not really a useful form. Hoist this struct into bundle_priv and rework the internal things to use it instead. Move a bunch of the processing internal state into the priv and reduce the excessive use of function arguments. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:38 +08:00
struct bundle_priv {
IB/uverbs: Add a simple allocator to uverbs_attr_bundle This is similar in spirit to devm, it keeps track of any allocations linked to this method call and ensures they are all freed when the method exits. Further, if there is space in the internal/onstack buffer then the allocator will hand out that memory and avoid an expensive call to kalloc/kfree in the syscall path. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:40 +08:00
/* Must be first */
struct bundle_alloc_head alloc_head;
struct bundle_alloc_head *allocated_mem;
size_t internal_avail;
size_t internal_used;
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
struct radix_tree_root *radix;
const struct uverbs_api_ioctl_method *method_elm;
void __rcu **radix_slots;
unsigned long radix_slots_len;
u32 method_key;
IB/uverbs: Provide implementation private memory for the uverbs_attr_bundle This already existed as the anonymous 'ctx' structure, but this was not really a useful form. Hoist this struct into bundle_priv and rework the internal things to use it instead. Move a bunch of the processing internal state into the priv and reduce the excessive use of function arguments. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:38 +08:00
struct ib_uverbs_attr __user *user_attrs;
struct ib_uverbs_attr *uattrs;
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
DECLARE_BITMAP(uobj_finalize, UVERBS_API_ATTR_BKEY_LEN);
IB/uverbs: Provide implementation private memory for the uverbs_attr_bundle This already existed as the anonymous 'ctx' structure, but this was not really a useful form. Hoist this struct into bundle_priv and rework the internal things to use it instead. Move a bunch of the processing internal state into the priv and reduce the excessive use of function arguments. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:38 +08:00
/*
* Must be last. bundle ends in a flex array which overlaps
* internal_buffer.
*/
struct uverbs_attr_bundle bundle;
IB/uverbs: Add a simple allocator to uverbs_attr_bundle This is similar in spirit to devm, it keeps track of any allocations linked to this method call and ensures they are all freed when the method exits. Further, if there is space in the internal/onstack buffer then the allocator will hand out that memory and avoid an expensive call to kalloc/kfree in the syscall path. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:40 +08:00
u64 internal_buffer[32];
IB/uverbs: Provide implementation private memory for the uverbs_attr_bundle This already existed as the anonymous 'ctx' structure, but this was not really a useful form. Hoist this struct into bundle_priv and rework the internal things to use it instead. Move a bunch of the processing internal state into the priv and reduce the excessive use of function arguments. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:38 +08:00
};
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
/*
* Each method has an absolute minimum amount of memory it needs to allocate,
* precompute that amount and determine if the onstack memory can be used or
* if allocation is need.
*/
void uapi_compute_bundle_size(struct uverbs_api_ioctl_method *method_elm,
unsigned int num_attrs)
{
struct bundle_priv *pbundle;
size_t bundle_size =
offsetof(struct bundle_priv, internal_buffer) +
sizeof(*pbundle->bundle.attrs) * method_elm->key_bitmap_len +
sizeof(*pbundle->uattrs) * num_attrs;
method_elm->use_stack = bundle_size <= sizeof(*pbundle);
method_elm->bundle_size =
ALIGN(bundle_size + 256, sizeof(*pbundle->internal_buffer));
/* Do not want order-2 allocations for this. */
WARN_ON_ONCE(method_elm->bundle_size > PAGE_SIZE);
}
IB/uverbs: Add a simple allocator to uverbs_attr_bundle This is similar in spirit to devm, it keeps track of any allocations linked to this method call and ensures they are all freed when the method exits. Further, if there is space in the internal/onstack buffer then the allocator will hand out that memory and avoid an expensive call to kalloc/kfree in the syscall path. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:40 +08:00
/**
* uverbs_alloc() - Quickly allocate memory for use with a bundle
* @bundle: The bundle
* @size: Number of bytes to allocate
* @flags: Allocator flags
*
* The bundle allocator is intended for allocations that are connected with
* processing the system call related to the bundle. The allocated memory is
* always freed once the system call completes, and cannot be freed any other
* way.
*
* This tries to use a small pool of pre-allocated memory for performance.
*/
__malloc void *_uverbs_alloc(struct uverbs_attr_bundle *bundle, size_t size,
gfp_t flags)
{
struct bundle_priv *pbundle =
container_of(bundle, struct bundle_priv, bundle);
size_t new_used;
void *res;
if (check_add_overflow(size, pbundle->internal_used, &new_used))
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
return ERR_PTR(-EOVERFLOW);
IB/uverbs: Add a simple allocator to uverbs_attr_bundle This is similar in spirit to devm, it keeps track of any allocations linked to this method call and ensures they are all freed when the method exits. Further, if there is space in the internal/onstack buffer then the allocator will hand out that memory and avoid an expensive call to kalloc/kfree in the syscall path. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:40 +08:00
if (new_used > pbundle->internal_avail) {
struct bundle_alloc_head *buf;
buf = kvmalloc(struct_size(buf, data, size), flags);
if (!buf)
return ERR_PTR(-ENOMEM);
buf->next = pbundle->allocated_mem;
pbundle->allocated_mem = buf;
return buf->data;
}
res = (void *)pbundle->internal_buffer + pbundle->internal_used;
pbundle->internal_used =
ALIGN(new_used, sizeof(*pbundle->internal_buffer));
if (flags & __GFP_ZERO)
memset(res, 0, size);
return res;
}
EXPORT_SYMBOL(_uverbs_alloc);
IB/uverbs: Safely extend existing attributes Previously, we've used UVERBS_ATTR_SPEC_F_MIN_SZ for extending existing attributes. The behavior of this flag was the kernel accepts anything bigger than the minimum size it specified. This is unsafe, since in order to safely extend an attribute, we need to make sure unknown size is zeroed. Replacing UVERBS_ATTR_SPEC_F_MIN_SZ with UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO, which essentially checks that the unknown size is zero. In addition, attributes are now decorated with UVERBS_ATTR_TYPE and UVERBS_ATTR_STRUCT, so we can provide the minimum and known length. Users of this flag needs to use copy_from_or_zero functions/macros. Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-03-19 21:02:36 +08:00
static bool uverbs_is_attr_cleared(const struct ib_uverbs_attr *uattr,
u16 len)
{
if (uattr->len > sizeof(((struct ib_uverbs_attr *)0)->data))
return ib_is_buffer_cleared(u64_to_user_ptr(uattr->data) + len,
uattr->len - len);
return !memchr_inv((const void *)&uattr->data + len,
0, uattr->len - len);
}
IB/uverbs: Provide implementation private memory for the uverbs_attr_bundle This already existed as the anonymous 'ctx' structure, but this was not really a useful form. Hoist this struct into bundle_priv and rework the internal things to use it instead. Move a bunch of the processing internal state into the priv and reduce the excessive use of function arguments. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:38 +08:00
static int uverbs_process_attr(struct bundle_priv *pbundle,
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
const struct uverbs_api_attr *attr_uapi,
struct ib_uverbs_attr *uattr, u32 attr_bkey)
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
{
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
const struct uverbs_attr_spec *spec = &attr_uapi->spec;
struct uverbs_attr *e = &pbundle->bundle.attrs[attr_bkey];
const struct uverbs_attr_spec *val_spec = spec;
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
struct uverbs_obj_attr *o_attr;
switch (spec->type) {
IB/uverbs: Add enum attribute type to ioctl() interface Methods sometimes need to get one attribute out of a group of pre-defined attributes. This is an enum-like behavior. Since this is a common requirement, we add a new ENUM attribute to the generic uverbs ioctl() layer. This attribute is embedded in methods, like any other attributes we currently have. ENUM attributes point to an array of standard UVERBS_ATTR_PTR_IN. The user-space encodes the enum's attribute id in the id field and the internal PTR_IN attr id in the enum_data.elem_id field. This ENUM attribute could be shared by several attributes and it can get UVERBS_ATTR_SPEC_F_MANDATORY flag, stating this attribute must be supported by the kernel, like any other attribute. Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-03-28 14:27:42 +08:00
case UVERBS_ATTR_TYPE_ENUM_IN:
RDMA/uverbs: Simplify UVERBS_ATTR family of macros Instead of using a complex cascade of macros, just directly provide the initializer list each of the declarations is trying to create. Now that the macros are simplified this also reworks the uverbs_attr_spec to be friendly to older compilers by eliminating any unnamed structures/unions inside, and removing the duplication of some fields. The structure size remains at 16 bytes which was the original motivation for some of this oddness. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
2018-07-04 13:50:25 +08:00
if (uattr->attr_data.enum_data.elem_id >= spec->u.enum_def.num_elems)
IB/uverbs: Add enum attribute type to ioctl() interface Methods sometimes need to get one attribute out of a group of pre-defined attributes. This is an enum-like behavior. Since this is a common requirement, we add a new ENUM attribute to the generic uverbs ioctl() layer. This attribute is embedded in methods, like any other attributes we currently have. ENUM attributes point to an array of standard UVERBS_ATTR_PTR_IN. The user-space encodes the enum's attribute id in the id field and the internal PTR_IN attr id in the enum_data.elem_id field. This ENUM attribute could be shared by several attributes and it can get UVERBS_ATTR_SPEC_F_MANDATORY flag, stating this attribute must be supported by the kernel, like any other attribute. Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-03-28 14:27:42 +08:00
return -EOPNOTSUPP;
if (uattr->attr_data.enum_data.reserved)
return -EINVAL;
RDMA/uverbs: Simplify UVERBS_ATTR family of macros Instead of using a complex cascade of macros, just directly provide the initializer list each of the declarations is trying to create. Now that the macros are simplified this also reworks the uverbs_attr_spec to be friendly to older compilers by eliminating any unnamed structures/unions inside, and removing the duplication of some fields. The structure size remains at 16 bytes which was the original motivation for some of this oddness. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
2018-07-04 13:50:25 +08:00
val_spec = &spec->u2.enum_def.ids[uattr->attr_data.enum_data.elem_id];
IB/uverbs: Add enum attribute type to ioctl() interface Methods sometimes need to get one attribute out of a group of pre-defined attributes. This is an enum-like behavior. Since this is a common requirement, we add a new ENUM attribute to the generic uverbs ioctl() layer. This attribute is embedded in methods, like any other attributes we currently have. ENUM attributes point to an array of standard UVERBS_ATTR_PTR_IN. The user-space encodes the enum's attribute id in the id field and the internal PTR_IN attr id in the enum_data.elem_id field. This ENUM attribute could be shared by several attributes and it can get UVERBS_ATTR_SPEC_F_MANDATORY flag, stating this attribute must be supported by the kernel, like any other attribute. Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-03-28 14:27:42 +08:00
/* Currently we only support PTR_IN based enums */
if (val_spec->type != UVERBS_ATTR_TYPE_PTR_IN)
return -EOPNOTSUPP;
e->ptr_attr.enum_id = uattr->attr_data.enum_data.elem_id;
/* fall through */
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
case UVERBS_ATTR_TYPE_PTR_IN:
IB/uverbs: Safely extend existing attributes Previously, we've used UVERBS_ATTR_SPEC_F_MIN_SZ for extending existing attributes. The behavior of this flag was the kernel accepts anything bigger than the minimum size it specified. This is unsafe, since in order to safely extend an attribute, we need to make sure unknown size is zeroed. Replacing UVERBS_ATTR_SPEC_F_MIN_SZ with UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO, which essentially checks that the unknown size is zero. In addition, attributes are now decorated with UVERBS_ATTR_TYPE and UVERBS_ATTR_STRUCT, so we can provide the minimum and known length. Users of this flag needs to use copy_from_or_zero functions/macros. Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-03-19 21:02:36 +08:00
/* Ensure that any data provided by userspace beyond the known
* struct is zero. Userspace that knows how to use some future
* longer struct will fail here if used with an old kernel and
* non-zero content, making ABI compat/discovery simpler.
*/
RDMA/uverbs: Simplify UVERBS_ATTR family of macros Instead of using a complex cascade of macros, just directly provide the initializer list each of the declarations is trying to create. Now that the macros are simplified this also reworks the uverbs_attr_spec to be friendly to older compilers by eliminating any unnamed structures/unions inside, and removing the duplication of some fields. The structure size remains at 16 bytes which was the original motivation for some of this oddness. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
2018-07-04 13:50:25 +08:00
if (uattr->len > val_spec->u.ptr.len &&
RDMA/uverbs: Combine MIN_SZ_OR_ZERO with UVERBS_ATTR_STRUCT After all the rework is done it is now possible to include single flags in the type macros. Any user of UVERBS_ATTR_STRUCT needs to zero check data past the end of the known struct to be correct, so make this mandatory, and get rid of MIN_SZ_OR_ZERO as a user flag. This changes UVERBS_ATTR_TYPE to refer to a struct of exact size with not possibility of extension, convert the few users of UVERBS_ATTR_TYPE and MIN_SZ_OR_ZERO to use UVERBS_ATTR_STRUCT. The one user of UVERBS_ATTR_STRUCT without MIN_SZ_OR_ZERO is just confused. There is some padding at the end of that struct, but userspace always provides it with the padding. The construction doesn't test if the padding is zero, so it is pointless. Just use UVERBS_ATTR_TYPE. Finally, rename min_sz_or_zero to zero_trailing to better reflect what it does and hopefully avoid such mis-uses in the future. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
2018-07-04 13:50:31 +08:00
val_spec->zero_trailing &&
RDMA/uverbs: Simplify UVERBS_ATTR family of macros Instead of using a complex cascade of macros, just directly provide the initializer list each of the declarations is trying to create. Now that the macros are simplified this also reworks the uverbs_attr_spec to be friendly to older compilers by eliminating any unnamed structures/unions inside, and removing the duplication of some fields. The structure size remains at 16 bytes which was the original motivation for some of this oddness. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
2018-07-04 13:50:25 +08:00
!uverbs_is_attr_cleared(uattr, val_spec->u.ptr.len))
IB/uverbs: Safely extend existing attributes Previously, we've used UVERBS_ATTR_SPEC_F_MIN_SZ for extending existing attributes. The behavior of this flag was the kernel accepts anything bigger than the minimum size it specified. This is unsafe, since in order to safely extend an attribute, we need to make sure unknown size is zeroed. Replacing UVERBS_ATTR_SPEC_F_MIN_SZ with UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO, which essentially checks that the unknown size is zero. In addition, attributes are now decorated with UVERBS_ATTR_TYPE and UVERBS_ATTR_STRUCT, so we can provide the minimum and known length. Users of this flag needs to use copy_from_or_zero functions/macros. Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-03-19 21:02:36 +08:00
return -EOPNOTSUPP;
/* fall through */
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
case UVERBS_ATTR_TYPE_PTR_OUT:
RDMA/uverbs: Simplify UVERBS_ATTR family of macros Instead of using a complex cascade of macros, just directly provide the initializer list each of the declarations is trying to create. Now that the macros are simplified this also reworks the uverbs_attr_spec to be friendly to older compilers by eliminating any unnamed structures/unions inside, and removing the duplication of some fields. The structure size remains at 16 bytes which was the original motivation for some of this oddness. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
2018-07-04 13:50:25 +08:00
if (uattr->len < val_spec->u.ptr.min_len ||
RDMA/uverbs: Combine MIN_SZ_OR_ZERO with UVERBS_ATTR_STRUCT After all the rework is done it is now possible to include single flags in the type macros. Any user of UVERBS_ATTR_STRUCT needs to zero check data past the end of the known struct to be correct, so make this mandatory, and get rid of MIN_SZ_OR_ZERO as a user flag. This changes UVERBS_ATTR_TYPE to refer to a struct of exact size with not possibility of extension, convert the few users of UVERBS_ATTR_TYPE and MIN_SZ_OR_ZERO to use UVERBS_ATTR_STRUCT. The one user of UVERBS_ATTR_STRUCT without MIN_SZ_OR_ZERO is just confused. There is some padding at the end of that struct, but userspace always provides it with the padding. The construction doesn't test if the padding is zero, so it is pointless. Just use UVERBS_ATTR_TYPE. Finally, rename min_sz_or_zero to zero_trailing to better reflect what it does and hopefully avoid such mis-uses in the future. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
2018-07-04 13:50:31 +08:00
(!val_spec->zero_trailing &&
RDMA/uverbs: Simplify UVERBS_ATTR family of macros Instead of using a complex cascade of macros, just directly provide the initializer list each of the declarations is trying to create. Now that the macros are simplified this also reworks the uverbs_attr_spec to be friendly to older compilers by eliminating any unnamed structures/unions inside, and removing the duplication of some fields. The structure size remains at 16 bytes which was the original motivation for some of this oddness. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
2018-07-04 13:50:25 +08:00
uattr->len > val_spec->u.ptr.len))
IB/uverbs: Add enum attribute type to ioctl() interface Methods sometimes need to get one attribute out of a group of pre-defined attributes. This is an enum-like behavior. Since this is a common requirement, we add a new ENUM attribute to the generic uverbs ioctl() layer. This attribute is embedded in methods, like any other attributes we currently have. ENUM attributes point to an array of standard UVERBS_ATTR_PTR_IN. The user-space encodes the enum's attribute id in the id field and the internal PTR_IN attr id in the enum_data.elem_id field. This ENUM attribute could be shared by several attributes and it can get UVERBS_ATTR_SPEC_F_MANDATORY flag, stating this attribute must be supported by the kernel, like any other attribute. Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-03-28 14:27:42 +08:00
return -EINVAL;
if (spec->type != UVERBS_ATTR_TYPE_ENUM_IN &&
uattr->attr_data.reserved)
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
return -EINVAL;
IB/uverbs: Remove the ib_uverbs_attr pointer from each attr Memory in the bundle is valuable, do not waste it holding an 8 byte pointer for the rare case of writing to a PTR_OUT. We can compute the pointer by storing a small 1 byte array offset and the base address of the uattr memory in the bundle private memory. This also means we can access the kernel's copy of the ib_uverbs_attr, so drop the copy of flags as well. Since the uattr base should be private bundle information this also de-inlines the already too big uverbs_copy_to inline and moves create_udata into uverbs_ioctl.c so they can see the private struct definition. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:39 +08:00
e->ptr_attr.uattr_idx = uattr - pbundle->uattrs;
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
e->ptr_attr.len = uattr->len;
IB/uverbs: Add PTR_IN attributes that are allocated/copied automatically Adding UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY flag to PTR_IN attributes. By using this flag, the parse automatically allocates and copies the user-space data. This data is accessible by using uverbs_attr_get_len and uverbs_attr_get_alloced_ptr inline accessor functions from the handler. Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-06-17 17:59:52 +08:00
RDMA/uverbs: Remove UA_FLAGS This bit of boilerplate isn't really necessary, we can use bitfields instead of a flags enum and the macros can then individually initialize them through the __VA_ARGS__ like everything else. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
2018-07-04 13:50:29 +08:00
if (val_spec->alloc_and_copy && !uverbs_attr_ptr_is_inline(e)) {
IB/uverbs: Add PTR_IN attributes that are allocated/copied automatically Adding UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY flag to PTR_IN attributes. By using this flag, the parse automatically allocates and copies the user-space data. This data is accessible by using uverbs_attr_get_len and uverbs_attr_get_alloced_ptr inline accessor functions from the handler. Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-06-17 17:59:52 +08:00
void *p;
IB/uverbs: Add a simple allocator to uverbs_attr_bundle This is similar in spirit to devm, it keeps track of any allocations linked to this method call and ensures they are all freed when the method exits. Further, if there is space in the internal/onstack buffer then the allocator will hand out that memory and avoid an expensive call to kalloc/kfree in the syscall path. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:40 +08:00
p = uverbs_alloc(&pbundle->bundle, uattr->len);
if (IS_ERR(p))
return PTR_ERR(p);
IB/uverbs: Add PTR_IN attributes that are allocated/copied automatically Adding UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY flag to PTR_IN attributes. By using this flag, the parse automatically allocates and copies the user-space data. This data is accessible by using uverbs_attr_get_len and uverbs_attr_get_alloced_ptr inline accessor functions from the handler. Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-06-17 17:59:52 +08:00
e->ptr_attr.ptr = p;
if (copy_from_user(p, u64_to_user_ptr(uattr->data),
IB/uverbs: Add a simple allocator to uverbs_attr_bundle This is similar in spirit to devm, it keeps track of any allocations linked to this method call and ensures they are all freed when the method exits. Further, if there is space in the internal/onstack buffer then the allocator will hand out that memory and avoid an expensive call to kalloc/kfree in the syscall path. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:40 +08:00
uattr->len))
IB/uverbs: Add PTR_IN attributes that are allocated/copied automatically Adding UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY flag to PTR_IN attributes. By using this flag, the parse automatically allocates and copies the user-space data. This data is accessible by using uverbs_attr_get_len and uverbs_attr_get_alloced_ptr inline accessor functions from the handler. Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-06-17 17:59:52 +08:00
return -EFAULT;
} else {
e->ptr_attr.data = uattr->data;
}
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
break;
case UVERBS_ATTR_TYPE_IDR:
case UVERBS_ATTR_TYPE_FD:
IB/uverbs: Add enum attribute type to ioctl() interface Methods sometimes need to get one attribute out of a group of pre-defined attributes. This is an enum-like behavior. Since this is a common requirement, we add a new ENUM attribute to the generic uverbs ioctl() layer. This attribute is embedded in methods, like any other attributes we currently have. ENUM attributes point to an array of standard UVERBS_ATTR_PTR_IN. The user-space encodes the enum's attribute id in the id field and the internal PTR_IN attr id in the enum_data.elem_id field. This ENUM attribute could be shared by several attributes and it can get UVERBS_ATTR_SPEC_F_MANDATORY flag, stating this attribute must be supported by the kernel, like any other attribute. Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-03-28 14:27:42 +08:00
if (uattr->attr_data.reserved)
return -EINVAL;
IB/uverbs: Fix locking around struct ib_uverbs_file ucontext We have a parallel unlocked reader and writer with ib_uverbs_get_context() vs everything else, and nothing guarantees this works properly. Audit and fix all of the places that access ucontext to use one of the following locking schemes: - Call ib_uverbs_get_ucontext() under SRCU and check for failure - Access the ucontext through an struct ib_uobject context member while holding a READ or WRITE lock on the uobject. This value cannot be NULL and has no race. - Hold the ucontext_lock and check for ufile->ucontext !NULL This also re-implements ib_uverbs_get_ucontext() in a way that is safe against concurrent ib_uverbs_get_context() and disassociation. As a side effect, every access to ucontext in the commands is via ib_uverbs_get_context() with an error check, or via the uobject, so there is no longer any need for the core code to check ucontext on every command call. These checks are also removed. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-07-11 03:43:06 +08:00
if (uattr->len != 0)
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
return -EINVAL;
o_attr = &e->obj_attr;
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
o_attr->attr_elm = attr_uapi;
IB/uverbs: Remove rdma_explicit_destroy() from the ioctl methods The core code will destroy the HW object on behalf of the method, if the method provides an implementation it must simply copy data from the stub uobj into the response. Destroy methods cannot touch the HW object. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-07-27 05:57:56 +08:00
IB/uverbs: Handle IDR and FD types without truncation Our ABI for write() uses a s32 for FDs and a u32 for IDRs, but internally we ended up implicitly casting these ABI values into an 'int'. For ioctl() we use a s64 for FDs and a u64 for IDRs, again casting to an int. The various casts to int are all missing range checks which can cause userspace values that should be considered invalid to be accepted. Fix this by making the generic lookup routine accept a s64, which does not truncate the write API's u32/s32 or the ioctl API's s64. Then push the detailed range checking down to the actual type implementations to be shared by both interfaces. Finally, change the copy of the uobj->id to sign extend into a s64, so eg, if we ever wish to return a negative value for a FD it is carried properly. This ensures that userspace values are never weirdly interpreted due to the various trunctations and everything that is really out of range gets an EINVAL. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-07-11 10:55:14 +08:00
/*
* The type of uattr->data is u64 for UVERBS_ATTR_TYPE_IDR and
* s64 for UVERBS_ATTR_TYPE_FD. We can cast the u64 to s64
* here without caring about truncation as we know that the
* IDR implementation today rejects negative IDs
*/
IB/uverbs: Replace ib_ucontext with ib_uverbs_file in core function calls The correct handle to refer to the idr/etc is ib_uverbs_file, revise all the core APIs to use this instead. The user API are left as wrappers that automatically convert a ucontext to a ufile for now. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
2018-07-04 16:32:08 +08:00
o_attr->uobject = uverbs_get_uobject_from_file(
IB/uverbs: Use uverbs_api to manage the object type inside the uobject Currently the struct uverbs_obj_type stored in the ib_uobject is part of the .rodata segment of the module that defines the object. This is a problem if drivers define new uapi objects as we will be left with a dangling pointer after device disassociation. Switch the uverbs_obj_type for struct uverbs_api_object, which is allocated memory that is part of the uverbs_api and is guaranteed to always exist. Further this moves the 'type_class' into this memory which means access to the IDR/FD function pointers is also guaranteed. Drivers cannot define new types. This makes it safe to continue to use all uobjects, including driver defined ones, after disassociation. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:37 +08:00
spec->u.obj.obj_type,
IB/uverbs: Provide implementation private memory for the uverbs_attr_bundle This already existed as the anonymous 'ctx' structure, but this was not really a useful form. Hoist this struct into bundle_priv and rework the internal things to use it instead. Move a bunch of the processing internal state into the priv and reduce the excessive use of function arguments. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:38 +08:00
pbundle->bundle.ufile,
RDMA/uverbs: Simplify UVERBS_ATTR family of macros Instead of using a complex cascade of macros, just directly provide the initializer list each of the declarations is trying to create. Now that the macros are simplified this also reworks the uverbs_attr_spec to be friendly to older compilers by eliminating any unnamed structures/unions inside, and removing the duplication of some fields. The structure size remains at 16 bytes which was the original motivation for some of this oddness. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
2018-07-04 13:50:25 +08:00
spec->u.obj.access,
IB/uverbs: Handle IDR and FD types without truncation Our ABI for write() uses a s32 for FDs and a u32 for IDRs, but internally we ended up implicitly casting these ABI values into an 'int'. For ioctl() we use a s64 for FDs and a u64 for IDRs, again casting to an int. The various casts to int are all missing range checks which can cause userspace values that should be considered invalid to be accepted. Fix this by making the generic lookup routine accept a s64, which does not truncate the write API's u32/s32 or the ioctl API's s64. Then push the detailed range checking down to the actual type implementations to be shared by both interfaces. Finally, change the copy of the uobj->id to sign extend into a s64, so eg, if we ever wish to return a negative value for a FD it is carried properly. This ensures that userspace values are never weirdly interpreted due to the various trunctations and everything that is really out of range gets an EINVAL. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-07-11 10:55:14 +08:00
uattr->data_s64);
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
if (IS_ERR(o_attr->uobject))
return PTR_ERR(o_attr->uobject);
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
__set_bit(attr_bkey, pbundle->uobj_finalize);
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
RDMA/uverbs: Simplify UVERBS_ATTR family of macros Instead of using a complex cascade of macros, just directly provide the initializer list each of the declarations is trying to create. Now that the macros are simplified this also reworks the uverbs_attr_spec to be friendly to older compilers by eliminating any unnamed structures/unions inside, and removing the duplication of some fields. The structure size remains at 16 bytes which was the original motivation for some of this oddness. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
2018-07-04 13:50:25 +08:00
if (spec->u.obj.access == UVERBS_ACCESS_NEW) {
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
unsigned int uattr_idx = uattr - pbundle->uattrs;
IB/uverbs: Handle IDR and FD types without truncation Our ABI for write() uses a s32 for FDs and a u32 for IDRs, but internally we ended up implicitly casting these ABI values into an 'int'. For ioctl() we use a s64 for FDs and a u64 for IDRs, again casting to an int. The various casts to int are all missing range checks which can cause userspace values that should be considered invalid to be accepted. Fix this by making the generic lookup routine accept a s64, which does not truncate the write API's u32/s32 or the ioctl API's s64. Then push the detailed range checking down to the actual type implementations to be shared by both interfaces. Finally, change the copy of the uobj->id to sign extend into a s64, so eg, if we ever wish to return a negative value for a FD it is carried properly. This ensures that userspace values are never weirdly interpreted due to the various trunctations and everything that is really out of range gets an EINVAL. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-07-11 10:55:14 +08:00
s64 id = o_attr->uobject->id;
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
/* Copy the allocated id to the user-space */
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
if (put_user(id, &pbundle->user_attrs[uattr_idx].data))
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
return -EFAULT;
}
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
/*
* We search the radix tree with the method prefix and now we want to fast
* search the suffix bits to get a particular attribute pointer. It is not
* totally clear to me if this breaks the radix tree encasulation or not, but
* it uses the iter data to determine if the method iter points at the same
* chunk that will store the attribute, if so it just derefs it directly. By
* construction in most kernel configs the method and attrs will all fit in a
* single radix chunk, so in most cases this will have no search. Other cases
* this falls back to a full search.
*/
static void __rcu **uapi_get_attr_for_method(struct bundle_priv *pbundle,
u32 attr_key)
IB/uverbs: Refactor uverbs_finalize_objects uverbs_finalize_objects is currently used only to commit or abort objects. Since we want to add automatic allocation/free of PTR_IN attributes, moving it to uverbs_ioctl.c and renamit it to uverbs_finalize_attrs. Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-06-17 17:59:51 +08:00
{
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
void __rcu **slot;
IB/uverbs: Refactor uverbs_finalize_objects uverbs_finalize_objects is currently used only to commit or abort objects. Since we want to add automatic allocation/free of PTR_IN attributes, moving it to uverbs_ioctl.c and renamit it to uverbs_finalize_attrs. Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-06-17 17:59:51 +08:00
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
if (likely(attr_key < pbundle->radix_slots_len)) {
void *entry;
IB/uverbs: Refactor uverbs_finalize_objects uverbs_finalize_objects is currently used only to commit or abort objects. Since we want to add automatic allocation/free of PTR_IN attributes, moving it to uverbs_ioctl.c and renamit it to uverbs_finalize_attrs. Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-06-17 17:59:51 +08:00
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
slot = pbundle->radix_slots + attr_key;
entry = rcu_dereference_raw(*slot);
if (likely(!radix_tree_is_internal_node(entry) && entry))
return slot;
IB/uverbs: Refactor uverbs_finalize_objects uverbs_finalize_objects is currently used only to commit or abort objects. Since we want to add automatic allocation/free of PTR_IN attributes, moving it to uverbs_ioctl.c and renamit it to uverbs_finalize_attrs. Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-06-17 17:59:51 +08:00
}
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
return radix_tree_lookup_slot(pbundle->radix,
pbundle->method_key | attr_key);
IB/uverbs: Refactor uverbs_finalize_objects uverbs_finalize_objects is currently used only to commit or abort objects. Since we want to add automatic allocation/free of PTR_IN attributes, moving it to uverbs_ioctl.c and renamit it to uverbs_finalize_attrs. Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-06-17 17:59:51 +08:00
}
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
static int uverbs_set_attr(struct bundle_priv *pbundle,
struct ib_uverbs_attr *uattr)
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
{
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
u32 attr_key = uapi_key_attr(uattr->attr_id);
u32 attr_bkey = uapi_bkey_attr(attr_key);
const struct uverbs_api_attr *attr;
void __rcu **slot;
int ret;
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
slot = uapi_get_attr_for_method(pbundle, attr_key);
if (!slot) {
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
/*
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
* Kernel does not support the attribute but user-space says it
* is mandatory
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
*/
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
if (uattr->flags & UVERBS_ATTR_F_MANDATORY)
return -EPROTONOSUPPORT;
return 0;
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
}
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
attr = srcu_dereference(
*slot, &pbundle->bundle.ufile->device->disassociate_srcu);
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
/* Reject duplicate attributes from user-space */
if (test_bit(attr_bkey, pbundle->bundle.attr_present))
return -EINVAL;
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
ret = uverbs_process_attr(pbundle, attr, uattr, attr_bkey);
if (ret)
return ret;
IB/uverbs: Fix validating mandatory attributes Previously, if a method contained mandatory attributes in a namespace that wasn't given by the user, these attributes weren't validated. Fixing this by iterating over all specification namespaces. Fixes: fac9658cabb9 ("IB/core: Add new ioctl interface") Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2018-04-24 16:15:20 +08:00
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
__set_bit(attr_bkey, pbundle->bundle.attr_present);
IB/uverbs: Fix validating mandatory attributes Previously, if a method contained mandatory attributes in a namespace that wasn't given by the user, these attributes weren't validated. Fixing this by iterating over all specification namespaces. Fixes: fac9658cabb9 ("IB/core: Add new ioctl interface") Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2018-04-24 16:15:20 +08:00
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
return 0;
}
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
static int ib_uverbs_run_method(struct bundle_priv *pbundle,
unsigned int num_attrs)
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
{
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
int (*handler)(struct ib_uverbs_file *ufile,
struct uverbs_attr_bundle *ctx);
size_t uattrs_size = array_size(sizeof(*pbundle->uattrs), num_attrs);
unsigned int destroy_bkey = pbundle->method_elm->destroy_bkey;
unsigned int i;
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
int ret;
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
/* See uverbs_disassociate_api() */
handler = srcu_dereference(
pbundle->method_elm->handler,
&pbundle->bundle.ufile->device->disassociate_srcu);
if (!handler)
return -EIO;
pbundle->uattrs = uverbs_alloc(&pbundle->bundle, uattrs_size);
if (IS_ERR(pbundle->uattrs))
return PTR_ERR(pbundle->uattrs);
if (copy_from_user(pbundle->uattrs, pbundle->user_attrs, uattrs_size))
return -EFAULT;
for (i = 0; i != num_attrs; i++) {
ret = uverbs_set_attr(pbundle, &pbundle->uattrs[i]);
if (unlikely(ret))
return ret;
}
/* User space did not provide all the mandatory attributes */
if (unlikely(!bitmap_subset(pbundle->method_elm->attr_mandatory,
pbundle->bundle.attr_present,
pbundle->method_elm->key_bitmap_len)))
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
return -EINVAL;
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
if (destroy_bkey != UVERBS_API_ATTR_BKEY_LEN) {
struct uverbs_obj_attr *destroy_attr =
&pbundle->bundle.attrs[destroy_bkey].obj_attr;
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
ret = uobj_destroy(destroy_attr->uobject);
IB/uverbs: Remove rdma_explicit_destroy() from the ioctl methods The core code will destroy the HW object on behalf of the method, if the method provides an implementation it must simply copy data from the stub uobj into the response. Destroy methods cannot touch the HW object. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-07-27 05:57:56 +08:00
if (ret)
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
return ret;
__clear_bit(destroy_bkey, pbundle->uobj_finalize);
IB/uverbs: Remove rdma_explicit_destroy() from the ioctl methods The core code will destroy the HW object on behalf of the method, if the method provides an implementation it must simply copy data from the stub uobj into the response. Destroy methods cannot touch the HW object. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-07-27 05:57:56 +08:00
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
ret = handler(pbundle->bundle.ufile, &pbundle->bundle);
uobj_put_destroy(destroy_attr->uobject);
} else {
ret = handler(pbundle->bundle.ufile, &pbundle->bundle);
IB/uverbs: Allow RDMA_REMOVE_DESTROY to work concurrently with disassociate After all the recent structural changes this is now straightfoward, hoist the hw_destroy_rwsem up out of rdma_destroy_explicit and wrap it around the uobject write lock as well as the destroy. This is necessary as obtaining a write lock concurrently with uverbs_destroy_ufile_hw() will cause malfunction. After this change none of the destroy callbacks require the disassociate_srcu lock to be correct. This requires introducing a new lookup mode, UVERBS_LOOKUP_DESTROY as the IOCTL interface needs to hold an unlocked kref until all command verification is completed. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-07-26 11:40:14 +08:00
}
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
/*
* EPROTONOSUPPORT is ONLY to be returned if the ioctl framework can
* not invoke the method because the request is not supported. No
* other cases should return this code.
*/
if (WARN_ON_ONCE(ret == -EPROTONOSUPPORT))
return -EINVAL;
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
return ret;
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
}
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
static int bundle_destroy(struct bundle_priv *pbundle, bool commit)
IB/uverbs: Add a simple allocator to uverbs_attr_bundle This is similar in spirit to devm, it keeps track of any allocations linked to this method call and ensures they are all freed when the method exits. Further, if there is space in the internal/onstack buffer then the allocator will hand out that memory and avoid an expensive call to kalloc/kfree in the syscall path. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:40 +08:00
{
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
unsigned int key_bitmap_len = pbundle->method_elm->key_bitmap_len;
IB/uverbs: Add a simple allocator to uverbs_attr_bundle This is similar in spirit to devm, it keeps track of any allocations linked to this method call and ensures they are all freed when the method exits. Further, if there is space in the internal/onstack buffer then the allocator will hand out that memory and avoid an expensive call to kalloc/kfree in the syscall path. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:40 +08:00
struct bundle_alloc_head *memblock;
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
unsigned int i;
int ret = 0;
i = -1;
while ((i = find_next_bit(pbundle->uobj_finalize, key_bitmap_len,
i + 1)) < key_bitmap_len) {
struct uverbs_attr *attr = &pbundle->bundle.attrs[i];
int current_ret;
current_ret = uverbs_finalize_object(
attr->obj_attr.uobject,
attr->obj_attr.attr_elm->spec.u.obj.access, commit);
if (!ret)
ret = current_ret;
}
IB/uverbs: Add a simple allocator to uverbs_attr_bundle This is similar in spirit to devm, it keeps track of any allocations linked to this method call and ensures they are all freed when the method exits. Further, if there is space in the internal/onstack buffer then the allocator will hand out that memory and avoid an expensive call to kalloc/kfree in the syscall path. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:40 +08:00
for (memblock = pbundle->allocated_mem; memblock;) {
struct bundle_alloc_head *tmp = memblock;
memblock = memblock->next;
kvfree(tmp);
}
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
return ret;
IB/uverbs: Add a simple allocator to uverbs_attr_bundle This is similar in spirit to devm, it keeps track of any allocations linked to this method call and ensures they are all freed when the method exits. Further, if there is space in the internal/onstack buffer then the allocator will hand out that memory and avoid an expensive call to kalloc/kfree in the syscall path. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:40 +08:00
}
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
static int ib_uverbs_cmd_verbs(struct ib_uverbs_file *ufile,
struct ib_uverbs_ioctl_hdr *hdr,
struct ib_uverbs_attr __user *user_attrs)
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
{
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
const struct uverbs_api_ioctl_method *method_elm;
struct uverbs_api *uapi = ufile->device->uapi;
struct radix_tree_iter attrs_iter;
struct bundle_priv *pbundle;
struct bundle_priv onstack;
void __rcu **slot;
int destroy_ret;
int ret;
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
if (unlikely(hdr->driver_id != uapi->driver_id))
IB/uverbs: Extend uverbs_ioctl header with driver_id Extending uverbs_ioctl header with driver_id and another reserved field. driver_id should be used in order to identify the driver. Since every driver could have its own parsing tree, this is necessary for strace support. Downstream patches take off the EXPERIMENTAL flag from the ioctl() IB support and thus we add some reserved fields for future usage. Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-03-19 21:02:34 +08:00
return -EINVAL;
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
slot = radix_tree_iter_lookup(
&uapi->radix, &attrs_iter,
uapi_key_obj(hdr->object_id) |
uapi_key_ioctl_method(hdr->method_id));
if (unlikely(!slot))
RDMA/uverbs: Use an unambiguous errno for method not supported Returning EOPNOTSUPP is problematic because it can also be returned by the method function, and we use it in quite a few places in drivers these days. Instead, dedicate EPROTONOSUPPORT to indicate that the ioctl framework is enabled but the requested object and method are not supported by the kernel. No other case will return this code, and it lets userspace know to fall back to write(). grep says we do not use it today in drivers/infiniband subsystem. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2018-01-25 10:58:34 +08:00
return -EPROTONOSUPPORT;
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
method_elm = srcu_dereference(*slot, &ufile->device->disassociate_srcu);
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
if (!method_elm->use_stack) {
pbundle = kmalloc(method_elm->bundle_size, GFP_KERNEL);
if (!pbundle)
return -ENOMEM;
pbundle->internal_avail =
method_elm->bundle_size -
IB/uverbs: Add a simple allocator to uverbs_attr_bundle This is similar in spirit to devm, it keeps track of any allocations linked to this method call and ensures they are all freed when the method exits. Further, if there is space in the internal/onstack buffer then the allocator will hand out that memory and avoid an expensive call to kalloc/kfree in the syscall path. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:40 +08:00
offsetof(struct bundle_priv, internal_buffer);
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
pbundle->alloc_head.next = NULL;
pbundle->allocated_mem = &pbundle->alloc_head;
IB/uverbs: Add a simple allocator to uverbs_attr_bundle This is similar in spirit to devm, it keeps track of any allocations linked to this method call and ensures they are all freed when the method exits. Further, if there is space in the internal/onstack buffer then the allocator will hand out that memory and avoid an expensive call to kalloc/kfree in the syscall path. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:40 +08:00
} else {
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
pbundle = &onstack;
pbundle->internal_avail = sizeof(pbundle->internal_buffer);
pbundle->allocated_mem = NULL;
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
}
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
/* Space for the pbundle->bundle.attrs flex array */
pbundle->method_elm = method_elm;
pbundle->method_key = attrs_iter.index;
pbundle->bundle.ufile = ufile;
pbundle->radix = &uapi->radix;
pbundle->radix_slots = slot;
pbundle->radix_slots_len = radix_tree_chunk_size(&attrs_iter);
pbundle->user_attrs = user_attrs;
pbundle->internal_used = ALIGN(pbundle->method_elm->key_bitmap_len *
sizeof(*pbundle->bundle.attrs),
sizeof(*pbundle->internal_buffer));
memset(pbundle->bundle.attr_present, 0,
sizeof(pbundle->bundle.attr_present));
memset(pbundle->uobj_finalize, 0, sizeof(pbundle->uobj_finalize));
ret = ib_uverbs_run_method(pbundle, hdr->num_attrs);
destroy_ret = bundle_destroy(pbundle, ret == 0);
if (unlikely(destroy_ret && !ret))
return destroy_ret;
RDMA/uverbs: Use an unambiguous errno for method not supported Returning EOPNOTSUPP is problematic because it can also be returned by the method function, and we use it in quite a few places in drivers these days. Instead, dedicate EPROTONOSUPPORT to indicate that the ioctl framework is enabled but the requested object and method are not supported by the kernel. No other case will return this code, and it lets userspace know to fall back to write(). grep says we do not use it today in drivers/infiniband subsystem. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2018-01-25 10:58:34 +08:00
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
return ret;
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
}
#define IB_UVERBS_MAX_CMD_SZ 4096
long ib_uverbs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct ib_uverbs_file *file = filp->private_data;
struct ib_uverbs_ioctl_hdr __user *user_hdr =
(struct ib_uverbs_ioctl_hdr __user *)arg;
struct ib_uverbs_ioctl_hdr hdr;
struct ib_device *ib_dev;
int srcu_key;
long err;
srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
ib_dev = srcu_dereference(file->device->ib_dev,
&file->device->disassociate_srcu);
if (!ib_dev) {
err = -EIO;
goto out;
}
if (cmd == RDMA_VERBS_IOCTL) {
err = copy_from_user(&hdr, user_hdr, sizeof(hdr));
if (err || hdr.length > IB_UVERBS_MAX_CMD_SZ ||
hdr.length != sizeof(hdr) + hdr.num_attrs * sizeof(struct ib_uverbs_attr)) {
err = -EINVAL;
goto out;
}
IB/uverbs: Extend uverbs_ioctl header with driver_id Extending uverbs_ioctl header with driver_id and another reserved field. driver_id should be used in order to identify the driver. Since every driver could have its own parsing tree, this is necessary for strace support. Downstream patches take off the EXPERIMENTAL flag from the ioctl() IB support and thus we add some reserved fields for future usage. Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-03-19 21:02:34 +08:00
if (hdr.reserved1 || hdr.reserved2) {
RDMA/uverbs: Use an unambiguous errno for method not supported Returning EOPNOTSUPP is problematic because it can also be returned by the method function, and we use it in quite a few places in drivers these days. Instead, dedicate EPROTONOSUPPORT to indicate that the ioctl framework is enabled but the requested object and method are not supported by the kernel. No other case will return this code, and it lets userspace know to fall back to write(). grep says we do not use it today in drivers/infiniband subsystem. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2018-01-25 10:58:34 +08:00
err = -EPROTONOSUPPORT;
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
goto out;
}
IB/uverbs: Use uverbs_api to unmarshal ioctl commands Convert the ioctl method syscall path to use the uverbs_api data structures. The new uapi structure includes all the same information, just in a different and more optimal way. - Use attr_bkey instead of 2 level radix trees for everything related to attributes. This includes the attribute storage, presence, and detection of missing mandatory attributes. - Avoid iterating over all attribute storage at finish, instead use find_first_bit with the attr_bkey to locate only those attrs that need cleanup. - Organize things to always run, and always rely on, cleanup. This avoids a bunch of tricky error unwind cases. - Locate the method using the radix tree, and locate the attributes using a very efficient incremental radix tree lookup - Use the precomputed destroy_bkey to handle uobject destruction - Use the precomputed allocation sizes and precomputed 'need_stack' to avoid maths in the fast path. This is optimal if userspace does not pass (many) unsupported attributes. Overall this results in much better codegen for the attribute accessors, everything is now stored in bitmaps or linear arrays indexed by attr_bkey. The compiler can compute attr_bkey values at compile time for all method attributes, meaning things like uverbs_attr_is_valid() now compile into single instruction bit tests. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-10 10:14:42 +08:00
err = ib_uverbs_cmd_verbs(file, &hdr, user_hdr->attrs);
IB/core: Add new ioctl interface In this ioctl interface, processing the command starts from properties of the command and fetching the appropriate user objects before calling the handler. Parsing and validation is done according to a specifier declared by the driver's code. In the driver, all supported objects are declared. These objects are separated to different object namepsaces. Dividing objects to namespaces is done at initialization by using the higher bits of the object ids. This initialization can mix objects declared in different places to one parsing tree using in this ioctl interface. For each object we list all supported methods. Similarly to objects, methods are separated to method namespaces too. Namespacing is done similarly to the objects case. This could be used in order to add methods to an existing object. Each method has a specific handler, which could be either a default handler or a driver specific handler. Along with the handler, a bunch of attributes are specified as well. Similarly to objects and method, attributes are namespaced and hashed by their ids at initialization too. All supported attributes are subject to automatic fetching and validation. These attributes include the command, response and the method's related objects' ids. When these entities (objects, methods and attributes) are used, the high bits of the entities ids are used in order to calculate the hash bucket index. Then, these high bits are masked out in order to have a zero based index. Since we use these high bits for both bucketing and namespacing, we get a compact representation and O(1) array access. This is mandatory for efficient dispatching. Each attribute has a type (PTR_IN, PTR_OUT, IDR and FD) and a length. Attributes could be validated through some attributes, like: (*) Minimum size / Exact size (*) Fops for FD (*) Object type for IDR If an IDR/fd attribute is specified, the kernel also states the object type and the required access (NEW, WRITE, READ or DESTROY). All uobject/fd management is done automatically by the infrastructure, meaning - the infrastructure will fail concurrent commands that at least one of them requires concurrent access (WRITE/DESTROY), synchronize actions with device removals (dissociate context events) and take care of reference counting (increase/decrease) for concurrent actions invocation. The reference counts on the actual kernel objects shall be handled by the handlers. objects +--------+ | | | | methods +--------+ | | ns method method_spec +-----+ |len | +--------+ +------+[d]+-------+ +----------------+[d]+------------+ |attr1+-> |type | | object +> |method+-> | spec +-> + attr_buckets +-> |default_chain+--> +-----+ |idr_type| +--------+ +------+ |handler| | | +------------+ |attr2| |access | | | | | +-------+ +----------------+ |driver chain| +-----+ +--------+ | | | | +------------+ | | +------+ | | | | | | | | | | | | | | | | | | | | +--------+ [d] = Hash ids to groups using the high order bits The right types table is also chosen by using the high bits from the ids. Currently we have either default or driver specific groups. Once validation and object fetching (or creation) completed, we call the handler: int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, struct uverbs_attr_bundle *ctx); ctx bundles attributes of different namespaces. Each element there is an array of attributes which corresponds to one namespaces of attributes. For example, in the usually used case: ctx core +----------------------------+ +------------+ | core: +---> | valid | +----------------------------+ | cmd_attr | | driver: | +------------+ |----------------------------+--+ | valid | | | cmd_attr | | +------------+ | | valid | | | obj_attr | | +------------+ | | drivers | +------------+ +> | valid | | cmd_attr | +------------+ | valid | | cmd_attr | +------------+ | valid | | obj_attr | +------------+ Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-03 21:06:57 +08:00
} else {
err = -ENOIOCTLCMD;
}
out:
srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
return err;
}
IB/uverbs: Add UVERBS_ATTR_FLAGS_IN to the specs language This clearly indicates that the input is a bitwise combination of values in an enum, and identifies which enum contains the definition of the bits. Special accessors are provided that handle the mandatory validation of the allowed bits and enforce the correct type for bitwise flags. If we had introduced this at the start then the kabi would have uniformly used u64 data to pass flags, however today there is a mixture of u64 and u32 flags. All places are converted to accept both sizes and the accessor fixes it. This allows all existing flags to grow to u64 in future without any hassle. Finally all flags are, by definition, optional. If flags are not passed the accessor does not fail, but provides a value of zero. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-07-27 06:37:14 +08:00
int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, u64 allowed_bits)
{
const struct uverbs_attr *attr;
u64 flags;
attr = uverbs_attr_get(attrs_bundle, idx);
/* Missing attribute means 0 flags */
if (IS_ERR(attr)) {
*to = 0;
return 0;
}
/*
* New userspace code should use 8 bytes to pass flags, but we
* transparently support old userspaces that were using 4 bytes as
* well.
*/
if (attr->ptr_attr.len == 8)
flags = attr->ptr_attr.data;
else if (attr->ptr_attr.len == 4)
IB/uverbs: Fix reading of 32 bit flags This is missing a zeroing of the high bits of flags, and is also not correct for big endian machines. Properly zero extend the 32 bit flags into the 64 bit stack variable. Reported-by: Michael J. Ruhl <michael.j.ruhl@intel.com> Fixes: bccd06223f21 ("IB/uverbs: Add UVERBS_ATTR_FLAGS_IN to the specs language") Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
2018-08-10 00:19:35 +08:00
flags = *(u32 *)&attr->ptr_attr.data;
IB/uverbs: Add UVERBS_ATTR_FLAGS_IN to the specs language This clearly indicates that the input is a bitwise combination of values in an enum, and identifies which enum contains the definition of the bits. Special accessors are provided that handle the mandatory validation of the allowed bits and enforce the correct type for bitwise flags. If we had introduced this at the start then the kabi would have uniformly used u64 data to pass flags, however today there is a mixture of u64 and u32 flags. All places are converted to accept both sizes and the accessor fixes it. This allows all existing flags to grow to u64 in future without any hassle. Finally all flags are, by definition, optional. If flags are not passed the accessor does not fail, but provides a value of zero. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-07-27 06:37:14 +08:00
else
return -EINVAL;
if (flags & ~allowed_bits)
return -EINVAL;
*to = flags;
return 0;
}
EXPORT_SYMBOL(uverbs_get_flags64);
int uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, u64 allowed_bits)
{
u64 flags;
int ret;
ret = uverbs_get_flags64(&flags, attrs_bundle, idx, allowed_bits);
if (ret)
return ret;
if (flags > U32_MAX)
return -EINVAL;
*to = flags;
return 0;
}
EXPORT_SYMBOL(uverbs_get_flags32);
IB/uverbs: Remove the ib_uverbs_attr pointer from each attr Memory in the bundle is valuable, do not waste it holding an 8 byte pointer for the rare case of writing to a PTR_OUT. We can compute the pointer by storing a small 1 byte array offset and the base address of the uattr memory in the bundle private memory. This also means we can access the kernel's copy of the ib_uverbs_attr, so drop the copy of flags as well. Since the uattr base should be private bundle information this also de-inlines the already too big uverbs_copy_to inline and moves create_udata into uverbs_ioctl.c so they can see the private struct definition. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
2018-08-10 10:14:39 +08:00
/*
* This is for ease of conversion. The purpose is to convert all drivers to
* use uverbs_attr_bundle instead of ib_udata. Assume attr == 0 is input and
* attr == 1 is output.
*/
void create_udata(struct uverbs_attr_bundle *bundle, struct ib_udata *udata)
{
struct bundle_priv *pbundle =
container_of(bundle, struct bundle_priv, bundle);
const struct uverbs_attr *uhw_in =
uverbs_attr_get(bundle, UVERBS_ATTR_UHW_IN);
const struct uverbs_attr *uhw_out =
uverbs_attr_get(bundle, UVERBS_ATTR_UHW_OUT);
if (!IS_ERR(uhw_in)) {
udata->inlen = uhw_in->ptr_attr.len;
if (uverbs_attr_ptr_is_inline(uhw_in))
udata->inbuf =
&pbundle->user_attrs[uhw_in->ptr_attr.uattr_idx]
.data;
else
udata->inbuf = u64_to_user_ptr(uhw_in->ptr_attr.data);
} else {
udata->inbuf = NULL;
udata->inlen = 0;
}
if (!IS_ERR(uhw_out)) {
udata->outbuf = u64_to_user_ptr(uhw_out->ptr_attr.data);
udata->outlen = uhw_out->ptr_attr.len;
} else {
udata->outbuf = NULL;
udata->outlen = 0;
}
}
int uverbs_copy_to(const struct uverbs_attr_bundle *bundle, size_t idx,
const void *from, size_t size)
{
struct bundle_priv *pbundle =
container_of(bundle, struct bundle_priv, bundle);
const struct uverbs_attr *attr = uverbs_attr_get(bundle, idx);
u16 flags;
size_t min_size;
if (IS_ERR(attr))
return PTR_ERR(attr);
min_size = min_t(size_t, attr->ptr_attr.len, size);
if (copy_to_user(u64_to_user_ptr(attr->ptr_attr.data), from, min_size))
return -EFAULT;
flags = pbundle->uattrs[attr->ptr_attr.uattr_idx].flags |
UVERBS_ATTR_F_VALID_OUTPUT;
if (put_user(flags,
&pbundle->user_attrs[attr->ptr_attr.uattr_idx].flags))
return -EFAULT;
return 0;
}
EXPORT_SYMBOL(uverbs_copy_to);
Reference in New Issue Copy Permalink