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Revert "net/mlx5: Add retry mechanism to the command entry index allocation"

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commit 4f6626b0e140867fd6d5a2e9d4ceaef97f10f46a upstream.

This reverts commit 410bd754cd73c4a2ac3856d9a03d7b08f9c906bf.

The reverted commit had added a retry mechanism to the command entry
index allocation. The previous patch ensures that there is a free
command entry index once the command work handler holds the command
semaphore. Thus the retry mechanism is not needed.

Fixes: 410bd754cd73 ("net/mlx5: Add retry mechanism to the command entry index allocation")
Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Eran Ben Elisha <eranbe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Moshe Shemesh 2021-12-05 11:20:59 +02:00 committed by Greg Kroah-Hartman
parent 6926d42794
commit 261f991764
1 changed files with 1 additions and 20 deletions
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21
drivers/net/ethernet/mellanox/mlx5/core/cmd.c
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@ -887,25 +887,6 @@ static bool opcode_allowed(struct mlx5_cmd *cmd, u16 opcode)
return cmd->allowed_opcode == opcode;
}
static int cmd_alloc_index_retry(struct mlx5_cmd *cmd)
{
unsigned long alloc_end = jiffies + msecs_to_jiffies(1000);
int idx;
retry:
idx = cmd_alloc_index(cmd);
if (idx < 0 && time_before(jiffies, alloc_end)) {
/* Index allocation can fail on heavy load of commands. This is a temporary
* situation as the current command already holds the semaphore, meaning that
* another command completion is being handled and it is expected to release
* the entry index soon.
*/
cpu_relax();
goto retry;
}
return idx;
}
static void cmd_work_handler(struct work_struct *work)
{
struct mlx5_cmd_work_ent *ent = container_of(work, struct mlx5_cmd_work_ent, work);
@ -923,7 +904,7 @@ static void cmd_work_handler(struct work_struct *work)
sem = ent->page_queue ? &cmd->pages_sem : &cmd->sem;
down(sem);
if (!ent->page_queue) {
alloc_ret = cmd_alloc_index_retry(cmd);
alloc_ret = cmd_alloc_index(cmd);
if (alloc_ret < 0) {
mlx5_core_err(dev, "failed to allocate command entry\n");
if (ent->callback) {