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5242711294
In order to use the parsing tree, we need to assign the root to all drivers. Currently, we just assign the default parsing tree via ib_uverbs_add_one. The driver could override this by assigning a parsing tree prior to registering the device. Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
439 lines
14 KiB
C
439 lines
14 KiB
C
/*
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* Copyright (c) 2017, Mellanox Technologies inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _UVERBS_IOCTL_
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#define _UVERBS_IOCTL_
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#include <rdma/uverbs_types.h>
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#include <linux/uaccess.h>
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#include <rdma/rdma_user_ioctl.h>
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#include <rdma/ib_user_ioctl_verbs.h>
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/*
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* =======================================
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* Verbs action specifications
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* =======================================
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*/
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enum uverbs_attr_type {
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UVERBS_ATTR_TYPE_NA,
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UVERBS_ATTR_TYPE_PTR_IN,
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UVERBS_ATTR_TYPE_PTR_OUT,
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UVERBS_ATTR_TYPE_IDR,
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UVERBS_ATTR_TYPE_FD,
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};
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enum uverbs_obj_access {
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UVERBS_ACCESS_READ,
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UVERBS_ACCESS_WRITE,
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UVERBS_ACCESS_NEW,
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UVERBS_ACCESS_DESTROY
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};
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enum {
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UVERBS_ATTR_SPEC_F_MANDATORY = 1U << 0,
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/* Support extending attributes by length */
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UVERBS_ATTR_SPEC_F_MIN_SZ = 1U << 1,
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};
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struct uverbs_attr_spec {
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enum uverbs_attr_type type;
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union {
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u16 len;
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struct {
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/*
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* higher bits mean the namespace and lower bits mean
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* the type id within the namespace.
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*/
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u16 obj_type;
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u8 access;
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} obj;
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};
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/* Combination of bits from enum UVERBS_ATTR_SPEC_F_XXXX */
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u8 flags;
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};
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struct uverbs_attr_spec_hash {
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size_t num_attrs;
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unsigned long *mandatory_attrs_bitmask;
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struct uverbs_attr_spec attrs[0];
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};
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struct uverbs_attr_bundle;
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struct ib_uverbs_file;
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enum {
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/*
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* Action marked with this flag creates a context (or root for all
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* objects).
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*/
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UVERBS_ACTION_FLAG_CREATE_ROOT = 1U << 0,
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};
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struct uverbs_method_spec {
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/* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */
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u32 flags;
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size_t num_buckets;
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size_t num_child_attrs;
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int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile,
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struct uverbs_attr_bundle *ctx);
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struct uverbs_attr_spec_hash *attr_buckets[0];
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};
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struct uverbs_method_spec_hash {
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size_t num_methods;
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struct uverbs_method_spec *methods[0];
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};
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struct uverbs_object_spec {
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const struct uverbs_obj_type *type_attrs;
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size_t num_buckets;
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struct uverbs_method_spec_hash *method_buckets[0];
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};
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struct uverbs_object_spec_hash {
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size_t num_objects;
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struct uverbs_object_spec *objects[0];
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};
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struct uverbs_root_spec {
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size_t num_buckets;
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struct uverbs_object_spec_hash *object_buckets[0];
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};
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/*
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* =======================================
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* Verbs definitions
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* =======================================
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*/
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struct uverbs_attr_def {
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u16 id;
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struct uverbs_attr_spec attr;
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};
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struct uverbs_method_def {
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u16 id;
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/* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */
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u32 flags;
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size_t num_attrs;
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const struct uverbs_attr_def * const (*attrs)[];
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int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile,
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struct uverbs_attr_bundle *ctx);
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};
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struct uverbs_object_def {
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u16 id;
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const struct uverbs_obj_type *type_attrs;
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size_t num_methods;
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const struct uverbs_method_def * const (*methods)[];
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};
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struct uverbs_object_tree_def {
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size_t num_objects;
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const struct uverbs_object_def * const (*objects)[];
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};
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#define UA_FLAGS(_flags) .flags = _flags
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#define __UVERBS_ATTR0(_id, _len, _type, ...) \
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((const struct uverbs_attr_def) \
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{.id = _id, .attr = {.type = _type, {.len = _len}, .flags = 0, } })
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#define __UVERBS_ATTR1(_id, _len, _type, _flags) \
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((const struct uverbs_attr_def) \
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{.id = _id, .attr = {.type = _type, {.len = _len}, _flags, } })
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#define __UVERBS_ATTR(_id, _len, _type, _flags, _n, ...) \
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__UVERBS_ATTR##_n(_id, _len, _type, _flags)
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/*
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* In new compiler, UVERBS_ATTR could be simplified by declaring it as
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* [_id] = {.type = _type, .len = _len, ##__VA_ARGS__}
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* But since we support older compilers too, we need the more complex code.
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*/
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#define UVERBS_ATTR(_id, _len, _type, ...) \
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__UVERBS_ATTR(_id, _len, _type, ##__VA_ARGS__, 1, 0)
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#define UVERBS_ATTR_PTR_IN_SZ(_id, _len, ...) \
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UVERBS_ATTR(_id, _len, UVERBS_ATTR_TYPE_PTR_IN, ##__VA_ARGS__)
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/* If sizeof(_type) <= sizeof(u64), this will be inlined rather than a pointer */
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#define UVERBS_ATTR_PTR_IN(_id, _type, ...) \
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UVERBS_ATTR_PTR_IN_SZ(_id, sizeof(_type), ##__VA_ARGS__)
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#define UVERBS_ATTR_PTR_OUT_SZ(_id, _len, ...) \
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UVERBS_ATTR(_id, _len, UVERBS_ATTR_TYPE_PTR_OUT, ##__VA_ARGS__)
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#define UVERBS_ATTR_PTR_OUT(_id, _type, ...) \
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UVERBS_ATTR_PTR_OUT_SZ(_id, sizeof(_type), ##__VA_ARGS__)
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/*
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* In new compiler, UVERBS_ATTR_IDR (and FD) could be simplified by declaring
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* it as
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* {.id = _id, \
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* .attr {.type = __obj_class, \
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* .obj = {.obj_type = _idr_type, \
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* .access = _access \
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* }, ##__VA_ARGS__ } }
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* But since we support older compilers too, we need the more complex code.
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*/
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#define ___UVERBS_ATTR_OBJ0(_id, _obj_class, _obj_type, _access, ...)\
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((const struct uverbs_attr_def) \
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{.id = _id, \
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.attr = {.type = _obj_class, \
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{.obj = {.obj_type = _obj_type, .access = _access } },\
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.flags = 0} })
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#define ___UVERBS_ATTR_OBJ1(_id, _obj_class, _obj_type, _access, _flags)\
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((const struct uverbs_attr_def) \
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{.id = _id, \
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.attr = {.type = _obj_class, \
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{.obj = {.obj_type = _obj_type, .access = _access} }, \
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_flags} })
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#define ___UVERBS_ATTR_OBJ(_id, _obj_class, _obj_type, _access, _flags, \
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_n, ...) \
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___UVERBS_ATTR_OBJ##_n(_id, _obj_class, _obj_type, _access, _flags)
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#define __UVERBS_ATTR_OBJ(_id, _obj_class, _obj_type, _access, ...) \
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___UVERBS_ATTR_OBJ(_id, _obj_class, _obj_type, _access, \
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##__VA_ARGS__, 1, 0)
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#define UVERBS_ATTR_IDR(_id, _idr_type, _access, ...) \
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__UVERBS_ATTR_OBJ(_id, UVERBS_ATTR_TYPE_IDR, _idr_type, _access,\
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##__VA_ARGS__)
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#define UVERBS_ATTR_FD(_id, _fd_type, _access, ...) \
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__UVERBS_ATTR_OBJ(_id, UVERBS_ATTR_TYPE_FD, _fd_type, \
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(_access) + BUILD_BUG_ON_ZERO( \
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(_access) != UVERBS_ACCESS_NEW && \
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(_access) != UVERBS_ACCESS_READ), \
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##__VA_ARGS__)
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#define DECLARE_UVERBS_ATTR_SPEC(_name, ...) \
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const struct uverbs_attr_def _name = __VA_ARGS__
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#define _UVERBS_METHOD_ATTRS_SZ(...) \
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(sizeof((const struct uverbs_attr_def * const []){__VA_ARGS__}) /\
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sizeof(const struct uverbs_attr_def *))
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#define _UVERBS_METHOD(_id, _handler, _flags, ...) \
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((const struct uverbs_method_def) { \
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.id = _id, \
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.flags = _flags, \
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.handler = _handler, \
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.num_attrs = _UVERBS_METHOD_ATTRS_SZ(__VA_ARGS__), \
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.attrs = &(const struct uverbs_attr_def * const []){__VA_ARGS__} })
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#define DECLARE_UVERBS_METHOD(_name, _id, _handler, ...) \
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const struct uverbs_method_def _name = \
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_UVERBS_METHOD(_id, _handler, 0, ##__VA_ARGS__)
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#define DECLARE_UVERBS_CTX_METHOD(_name, _id, _handler, _flags, ...) \
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const struct uverbs_method_def _name = \
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_UVERBS_METHOD(_id, _handler, \
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UVERBS_ACTION_FLAG_CREATE_ROOT, \
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##__VA_ARGS__)
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#define _UVERBS_OBJECT_METHODS_SZ(...) \
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(sizeof((const struct uverbs_method_def * const []){__VA_ARGS__}) / \
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sizeof(const struct uverbs_method_def *))
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#define _UVERBS_OBJECT(_id, _type_attrs, ...) \
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((const struct uverbs_object_def) { \
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.id = _id, \
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.type_attrs = _type_attrs, \
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.num_methods = _UVERBS_OBJECT_METHODS_SZ(__VA_ARGS__), \
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.methods = &(const struct uverbs_method_def * const []){__VA_ARGS__} })
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#define DECLARE_UVERBS_OBJECT(_name, _id, _type_attrs, ...) \
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const struct uverbs_object_def _name = \
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_UVERBS_OBJECT(_id, _type_attrs, ##__VA_ARGS__)
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#define _UVERBS_TREE_OBJECTS_SZ(...) \
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(sizeof((const struct uverbs_object_def * const []){__VA_ARGS__}) / \
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sizeof(const struct uverbs_object_def *))
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#define _UVERBS_OBJECT_TREE(...) \
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((const struct uverbs_object_tree_def) { \
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.num_objects = _UVERBS_TREE_OBJECTS_SZ(__VA_ARGS__), \
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.objects = &(const struct uverbs_object_def * const []){__VA_ARGS__} })
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#define DECLARE_UVERBS_OBJECT_TREE(_name, ...) \
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const struct uverbs_object_tree_def _name = \
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_UVERBS_OBJECT_TREE(__VA_ARGS__)
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/* =================================================
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* Parsing infrastructure
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* =================================================
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*/
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struct uverbs_ptr_attr {
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union {
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u64 data;
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void __user *ptr;
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};
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u16 len;
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/* Combination of bits from enum UVERBS_ATTR_F_XXXX */
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u16 flags;
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};
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struct uverbs_obj_attr {
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/* pointer to the kernel descriptor -> type, access, etc */
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const struct uverbs_obj_type *type;
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struct ib_uobject *uobject;
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/* fd or id in idr of this object */
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int id;
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};
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struct uverbs_attr {
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/*
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* pointer to the user-space given attribute, in order to write the
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* new uobject's id or update flags.
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*/
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struct ib_uverbs_attr __user *uattr;
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union {
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struct uverbs_ptr_attr ptr_attr;
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struct uverbs_obj_attr obj_attr;
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};
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};
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struct uverbs_attr_bundle_hash {
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/* if bit i is set, it means attrs[i] contains valid information */
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unsigned long *valid_bitmap;
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size_t num_attrs;
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/*
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* arrays of attributes, each element corresponds to the specification
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* of the attribute in the same index.
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*/
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struct uverbs_attr *attrs;
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};
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struct uverbs_attr_bundle {
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size_t num_buckets;
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struct uverbs_attr_bundle_hash hash[];
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};
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static inline bool uverbs_attr_is_valid_in_hash(const struct uverbs_attr_bundle_hash *attrs_hash,
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unsigned int idx)
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{
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return test_bit(idx, attrs_hash->valid_bitmap);
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}
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static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_bundle,
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unsigned int idx)
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{
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u16 idx_bucket = idx >> UVERBS_ID_NS_SHIFT;
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if (attrs_bundle->num_buckets <= idx_bucket)
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return false;
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return uverbs_attr_is_valid_in_hash(&attrs_bundle->hash[idx_bucket],
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idx & ~UVERBS_ID_NS_MASK);
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}
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static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle,
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u16 idx)
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{
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u16 idx_bucket = idx >> UVERBS_ID_NS_SHIFT;
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if (!uverbs_attr_is_valid(attrs_bundle, idx))
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return ERR_PTR(-ENOENT);
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return &attrs_bundle->hash[idx_bucket].attrs[idx & ~UVERBS_ID_NS_MASK];
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}
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static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle,
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size_t idx, const void *from)
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{
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const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
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u16 flags;
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if (IS_ERR(attr))
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return PTR_ERR(attr);
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flags = attr->ptr_attr.flags | UVERBS_ATTR_F_VALID_OUTPUT;
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return (!copy_to_user(attr->ptr_attr.ptr, from, attr->ptr_attr.len) &&
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!put_user(flags, &attr->uattr->flags)) ? 0 : -EFAULT;
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}
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static inline int _uverbs_copy_from(void *to, size_t to_size,
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const struct uverbs_attr_bundle *attrs_bundle,
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size_t idx)
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{
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const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
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if (IS_ERR(attr))
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return PTR_ERR(attr);
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if (to_size <= sizeof(((struct ib_uverbs_attr *)0)->data))
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memcpy(to, &attr->ptr_attr.data, attr->ptr_attr.len);
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else if (copy_from_user(to, attr->ptr_attr.ptr, attr->ptr_attr.len))
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return -EFAULT;
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return 0;
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}
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#define uverbs_copy_from(to, attrs_bundle, idx) \
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_uverbs_copy_from(to, sizeof(*(to)), attrs_bundle, idx)
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/* =================================================
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* Definitions -> Specs infrastructure
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* =================================================
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*/
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/*
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* uverbs_alloc_spec_tree - Merges different common and driver specific feature
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* into one parsing tree that every uverbs command will be parsed upon.
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*
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* @num_trees: Number of trees in the array @trees.
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* @trees: Array of pointers to tree root definitions to merge. Each such tree
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* possibly contains objects, methods and attributes definitions.
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*
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* Returns:
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* uverbs_root_spec *: The root of the merged parsing tree.
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* On error, we return an error code. Error is checked via IS_ERR.
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*
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* The following merges could take place:
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* a. Two trees representing the same method with different handler
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* -> We take the handler of the tree that its handler != NULL
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* and its index in the trees array is greater. The incentive for that
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* is that developers are expected to first merge common trees and then
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* merge trees that gives specialized the behaviour.
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* b. Two trees representing the same object with different
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* type_attrs (struct uverbs_obj_type):
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* -> We take the type_attrs of the tree that its type_attr != NULL
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* and its index in the trees array is greater. This could be used
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* in order to override the free function, allocation size, etc.
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* c. Two trees representing the same method attribute (same id but possibly
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* different attributes):
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* -> ERROR (-ENOENT), we believe that's not the programmer's intent.
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*
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* An object without any methods is considered invalid and will abort the
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* function with -ENOENT error.
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*/
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#if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS)
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struct uverbs_root_spec *uverbs_alloc_spec_tree(unsigned int num_trees,
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const struct uverbs_object_tree_def **trees);
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void uverbs_free_spec_tree(struct uverbs_root_spec *root);
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#else
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static inline struct uverbs_root_spec *uverbs_alloc_spec_tree(unsigned int num_trees,
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const struct uverbs_object_tree_def **trees)
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{
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return NULL;
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}
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static inline void uverbs_free_spec_tree(struct uverbs_root_spec *root)
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{
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}
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#endif
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#endif
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