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IB/mlx5: Introduce VAR object and its alloc/destroy methods

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Introduce VAR object and its alloc/destroy KABI methods. The internal
implementation uses the IB core API to manage mmap/munamp calls.

Link: https://lore.kernel.org/r/20191212110928.334995-5-leon@kernel.org
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Yishai Hadas 2019-12-12 13:09:27 +02:00 committed by Jason Gunthorpe
parent f164be8c03
commit 7be76bef32
3 changed files with 181 additions and 0 deletions
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157
drivers/infiniband/hw/mlx5/main.c
View File

@ -2078,6 +2078,7 @@ static void mlx5_ib_mmap_free(struct rdma_user_mmap_entry *entry)
{
struct mlx5_user_mmap_entry *mentry = to_mmmap(entry);
struct mlx5_ib_dev *dev = to_mdev(entry->ucontext->device);
struct mlx5_var_table *var_table = &dev->var_table;
struct mlx5_ib_dm *mdm;
switch (mentry->mmap_flag) {
@ -2087,6 +2088,12 @@ static void mlx5_ib_mmap_free(struct rdma_user_mmap_entry *entry)
mdm->size);
kfree(mdm);
break;
case MLX5_IB_MMAP_TYPE_VAR:
mutex_lock(&var_table->bitmap_lock);
clear_bit(mentry->page_idx, var_table->bitmap);
mutex_unlock(&var_table->bitmap_lock);
kfree(mentry);
break;
default:
WARN_ON(true);
}
@ -2255,6 +2262,15 @@ static int mlx5_ib_mmap_offset(struct mlx5_ib_dev *dev,
return ret;
}
static u64 mlx5_entry_to_mmap_offset(struct mlx5_user_mmap_entry *entry)
{
u16 cmd = entry->rdma_entry.start_pgoff >> 16;
u16 index = entry->rdma_entry.start_pgoff & 0xFFFF;
return (((index >> 8) << 16) | (cmd << MLX5_IB_MMAP_CMD_SHIFT) |
(index & 0xFF)) << PAGE_SHIFT;
}
static int mlx5_ib_mmap(struct ib_ucontext *ibcontext, struct vm_area_struct *vma)
{
struct mlx5_ib_ucontext *context = to_mucontext(ibcontext);
@ -6034,6 +6050,145 @@ static void mlx5_ib_cleanup_multiport_master(struct mlx5_ib_dev *dev)
mlx5_nic_vport_disable_roce(dev->mdev);
}
static int var_obj_cleanup(struct ib_uobject *uobject,
enum rdma_remove_reason why,
struct uverbs_attr_bundle *attrs)
{
struct mlx5_user_mmap_entry *obj = uobject->object;
rdma_user_mmap_entry_remove(&obj->rdma_entry);
return 0;
}
static struct mlx5_user_mmap_entry *
alloc_var_entry(struct mlx5_ib_ucontext *c)
{
struct mlx5_user_mmap_entry *entry;
struct mlx5_var_table *var_table;
u32 page_idx;
int err;
var_table = &to_mdev(c->ibucontext.device)->var_table;
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return ERR_PTR(-ENOMEM);
mutex_lock(&var_table->bitmap_lock);
page_idx = find_first_zero_bit(var_table->bitmap,
var_table->num_var_hw_entries);
if (page_idx >= var_table->num_var_hw_entries) {
err = -ENOSPC;
mutex_unlock(&var_table->bitmap_lock);
goto end;
}
set_bit(page_idx, var_table->bitmap);
mutex_unlock(&var_table->bitmap_lock);
entry->address = var_table->hw_start_addr +
(page_idx * var_table->stride_size);
entry->page_idx = page_idx;
entry->mmap_flag = MLX5_IB_MMAP_TYPE_VAR;
err = rdma_user_mmap_entry_insert_range(
&c->ibucontext, &entry->rdma_entry, var_table->stride_size,
MLX5_IB_MMAP_OFFSET_START << 16,
(MLX5_IB_MMAP_OFFSET_END << 16) + (1UL << 16) - 1);
if (err)
goto err_insert;
return entry;
err_insert:
mutex_lock(&var_table->bitmap_lock);
clear_bit(page_idx, var_table->bitmap);
mutex_unlock(&var_table->bitmap_lock);
end:
kfree(entry);
return ERR_PTR(err);
}
static int UVERBS_HANDLER(MLX5_IB_METHOD_VAR_OBJ_ALLOC)(
struct uverbs_attr_bundle *attrs)
{
struct ib_uobject *uobj = uverbs_attr_get_uobject(
attrs, MLX5_IB_ATTR_VAR_OBJ_ALLOC_HANDLE);
struct mlx5_ib_ucontext *c;
struct mlx5_user_mmap_entry *entry;
u64 mmap_offset;
u32 length;
int err;
c = to_mucontext(ib_uverbs_get_ucontext(attrs));
if (IS_ERR(c))
return PTR_ERR(c);
entry = alloc_var_entry(c);
if (IS_ERR(entry))
return PTR_ERR(entry);
mmap_offset = mlx5_entry_to_mmap_offset(entry);
length = entry->rdma_entry.npages * PAGE_SIZE;
uobj->object = entry;
err = uverbs_copy_to(attrs, MLX5_IB_ATTR_VAR_OBJ_ALLOC_MMAP_OFFSET,
&mmap_offset, sizeof(mmap_offset));
if (err)
goto err;
err = uverbs_copy_to(attrs, MLX5_IB_ATTR_VAR_OBJ_ALLOC_PAGE_ID,
&entry->page_idx, sizeof(entry->page_idx));
if (err)
goto err;
err = uverbs_copy_to(attrs, MLX5_IB_ATTR_VAR_OBJ_ALLOC_MMAP_LENGTH,
&length, sizeof(length));
if (err)
goto err;
return 0;
err:
rdma_user_mmap_entry_remove(&entry->rdma_entry);
return err;
}
DECLARE_UVERBS_NAMED_METHOD(
MLX5_IB_METHOD_VAR_OBJ_ALLOC,
UVERBS_ATTR_IDR(MLX5_IB_ATTR_VAR_OBJ_ALLOC_HANDLE,
MLX5_IB_OBJECT_VAR,
UVERBS_ACCESS_NEW,
UA_MANDATORY),
UVERBS_ATTR_PTR_OUT(MLX5_IB_ATTR_VAR_OBJ_ALLOC_PAGE_ID,
UVERBS_ATTR_TYPE(u32),
UA_MANDATORY),
UVERBS_ATTR_PTR_OUT(MLX5_IB_ATTR_VAR_OBJ_ALLOC_MMAP_LENGTH,
UVERBS_ATTR_TYPE(u32),
UA_MANDATORY),
UVERBS_ATTR_PTR_OUT(MLX5_IB_ATTR_VAR_OBJ_ALLOC_MMAP_OFFSET,
UVERBS_ATTR_TYPE(u64),
UA_MANDATORY));
DECLARE_UVERBS_NAMED_METHOD_DESTROY(
MLX5_IB_METHOD_VAR_OBJ_DESTROY,
UVERBS_ATTR_IDR(MLX5_IB_ATTR_VAR_OBJ_DESTROY_HANDLE,
MLX5_IB_OBJECT_VAR,
UVERBS_ACCESS_DESTROY,
UA_MANDATORY));
DECLARE_UVERBS_NAMED_OBJECT(MLX5_IB_OBJECT_VAR,
UVERBS_TYPE_ALLOC_IDR(var_obj_cleanup),
&UVERBS_METHOD(MLX5_IB_METHOD_VAR_OBJ_ALLOC),
&UVERBS_METHOD(MLX5_IB_METHOD_VAR_OBJ_DESTROY));
static bool var_is_supported(struct ib_device *device)
{
struct mlx5_ib_dev *dev = to_mdev(device);
return (MLX5_CAP_GEN_64(dev->mdev, general_obj_types) &
MLX5_GENERAL_OBJ_TYPES_CAP_VIRTIO_NET_Q);
}
ADD_UVERBS_ATTRIBUTES_SIMPLE(
mlx5_ib_dm,
UVERBS_OBJECT_DM,
@ -6064,6 +6219,8 @@ static const struct uapi_definition mlx5_ib_defs[] = {
UAPI_DEF_CHAIN_OBJ_TREE(UVERBS_OBJECT_FLOW_ACTION,
&mlx5_ib_flow_action),
UAPI_DEF_CHAIN_OBJ_TREE(UVERBS_OBJECT_DM, &mlx5_ib_dm),
UAPI_DEF_CHAIN_OBJ_TREE_NAMED(MLX5_IB_OBJECT_VAR,
UAPI_DEF_IS_OBJ_SUPPORTED(var_is_supported)),
{}
};

7
drivers/infiniband/hw/mlx5/mlx5_ib.h
View File

@ -71,6 +71,11 @@
#define MLX5_MKEY_PAGE_SHIFT_MASK __mlx5_mask(mkc, log_page_size)
enum {
MLX5_IB_MMAP_OFFSET_START = 9,
MLX5_IB_MMAP_OFFSET_END = 255,
};
enum {
MLX5_IB_MMAP_CMD_SHIFT = 8,
MLX5_IB_MMAP_CMD_MASK = 0xff,
@ -120,6 +125,7 @@ enum {
enum mlx5_ib_mmap_type {
MLX5_IB_MMAP_TYPE_MEMIC = 1,
MLX5_IB_MMAP_TYPE_VAR = 2,
};
#define MLX5_LOG_SW_ICM_BLOCK_SIZE(dev) \
@ -563,6 +569,7 @@ struct mlx5_user_mmap_entry {
struct rdma_user_mmap_entry rdma_entry;
u8 mmap_flag;
u64 address;
u32 page_idx;
};
struct mlx5_ib_dm {

17
include/uapi/rdma/mlx5_user_ioctl_cmds.h
View File

@ -115,6 +115,22 @@ enum mlx5_ib_devx_obj_methods {
MLX5_IB_METHOD_DEVX_OBJ_ASYNC_QUERY,
};
enum mlx5_ib_var_alloc_attrs {
MLX5_IB_ATTR_VAR_OBJ_ALLOC_HANDLE = (1U << UVERBS_ID_NS_SHIFT),
MLX5_IB_ATTR_VAR_OBJ_ALLOC_MMAP_OFFSET,
MLX5_IB_ATTR_VAR_OBJ_ALLOC_MMAP_LENGTH,
MLX5_IB_ATTR_VAR_OBJ_ALLOC_PAGE_ID,
};
enum mlx5_ib_var_obj_destroy_attrs {
MLX5_IB_ATTR_VAR_OBJ_DESTROY_HANDLE = (1U << UVERBS_ID_NS_SHIFT),
};
enum mlx5_ib_var_obj_methods {
MLX5_IB_METHOD_VAR_OBJ_ALLOC = (1U << UVERBS_ID_NS_SHIFT),
MLX5_IB_METHOD_VAR_OBJ_DESTROY,
};
enum mlx5_ib_devx_umem_reg_attrs {
MLX5_IB_ATTR_DEVX_UMEM_REG_HANDLE = (1U << UVERBS_ID_NS_SHIFT),
MLX5_IB_ATTR_DEVX_UMEM_REG_ADDR,
@ -156,6 +172,7 @@ enum mlx5_ib_objects {
MLX5_IB_OBJECT_FLOW_MATCHER,
MLX5_IB_OBJECT_DEVX_ASYNC_CMD_FD,
MLX5_IB_OBJECT_DEVX_ASYNC_EVENT_FD,
MLX5_IB_OBJECT_VAR,
};
enum mlx5_ib_flow_matcher_create_attrs {