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RDMA/mlx5: Simplify devx async commands 

With the new FD structure the async commands do not need to hold any
references while running. The existing mlx5_cmd_exec_cb() and
mlx5_cmd_cleanup_async_ctx() provide enough synchronization to ensure
that all outstanding commands are completed before the uobject can be
destructed.

Remove the now confusing get_file() and the type erasure of the
devx_async_cmd_event_file.

Link: https://lore.kernel.org/r/1578504126-9400-4-git-send-email-yishaih@mellanox.com
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Jason Gunthorpe 2020-01-08 19:21:55 +02:00
parent f7c8416cce
commit 93887e66ff
1 changed files with 10 additions and 14 deletions
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24
drivers/infiniband/hw/mlx5/devx.c
View File

@ -30,7 +30,7 @@ enum devx_obj_flags {
struct devx_async_data {
struct mlx5_ib_dev *mdev;
struct list_head list;
struct ib_uobject *fd_uobj;
struct devx_async_cmd_event_file *ev_file;
struct mlx5_async_work cb_work;
u16 cmd_out_len;
/* must be last field in this structure */
@ -1673,21 +1673,20 @@ static void devx_query_callback(int status, struct mlx5_async_work *context)
{
struct devx_async_data *async_data =
container_of(context, struct devx_async_data, cb_work);
struct ib_uobject *fd_uobj = async_data->fd_uobj;
struct devx_async_cmd_event_file *ev_file;
struct devx_async_event_queue *ev_queue;
struct devx_async_cmd_event_file *ev_file = async_data->ev_file;
struct devx_async_event_queue *ev_queue = &ev_file->ev_queue;
unsigned long flags;
ev_file = container_of(fd_uobj, struct devx_async_cmd_event_file,
uobj);
ev_queue = &ev_file->ev_queue;
/*
* Note that if the struct devx_async_cmd_event_file uobj begins to be
* destroyed it will block at mlx5_cmd_cleanup_async_ctx() until this
* routine returns, ensuring that it always remains valid here.
*/
spin_lock_irqsave(&ev_queue->lock, flags);
list_add_tail(&async_data->list, &ev_queue->event_list);
spin_unlock_irqrestore(&ev_queue->lock, flags);
wake_up_interruptible(&ev_queue->poll_wait);
fput(fd_uobj->object);
}
#define MAX_ASYNC_BYTES_IN_USE (1024 * 1024) /* 1MB */
@ -1756,9 +1755,8 @@ static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_OBJ_ASYNC_QUERY)(
async_data->cmd_out_len = cmd_out_len;
async_data->mdev = mdev;
async_data->fd_uobj = fd_uobj;
async_data->ev_file = ev_file;
get_file(fd_uobj->object);
MLX5_SET(general_obj_in_cmd_hdr, cmd_in, uid, uid);
err = mlx5_cmd_exec_cb(&ev_file->async_ctx, cmd_in,
uverbs_attr_get_len(attrs,
@ -1768,12 +1766,10 @@ static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_OBJ_ASYNC_QUERY)(
devx_query_callback, &async_data->cb_work);
if (err)
goto cb_err;
goto free_async;
return 0;
cb_err:
fput(fd_uobj->object);
free_async:
kvfree(async_data);
sub_bytes: