This is a note to let you know that I've just added the patch titled
Revert "net/mlx5: Add retry mechanism to the command entry index allocation"
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
revert-net-mlx5-add-retry-mechanism-to-the-command-entry-index-allocation.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4f6626b0e140867fd6d5a2e9d4ceaef97f10f46a Mon Sep 17 00:00:00 2001
From: Moshe Shemesh <moshe@xxxxxxxxxx>
Date: Sun, 5 Dec 2021 11:20:59 +0200
Subject: Revert "net/mlx5: Add retry mechanism to the command entry index allocation"
From: Moshe Shemesh <moshe@xxxxxxxxxx>
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@xxxxxxxxxx>
Reviewed-by: Eran Ben Elisha <eranbe@xxxxxxxxxx>
Signed-off-by: Saeed Mahameed <saeedm@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/mellanox/mlx5/core/cmd.c | 21 +--------------------
1 file changed, 1 insertion(+), 20 deletions(-)
--- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
@@ -887,25 +887,6 @@ static bool opcode_allowed(struct mlx5_c
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;
-}
-
bool mlx5_cmd_is_down(struct mlx5_core_dev *dev)
{
return pci_channel_offline(dev->pdev) ||
@@ -930,7 +911,7 @@ static void cmd_work_handler(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_rl(dev, "failed to allocate command entry\n");
if (ent->callback) {
Patches currently in stable-queue which might be from moshe@xxxxxxxxxx are
queue-5.10/revert-net-mlx5-add-retry-mechanism-to-the-command-entry-index-allocation.patch
queue-5.10/net-mlx5-set-command-entry-semaphore-up-once-got-ind.patch
