patches for DPDK stable branches
 help / color / mirror / Atom feed
From: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
To: dev@dpdk.org, honnappa.nagarahalli@arm.com, matan@nvidia.com,
	shahafs@nvidia.com, viacheslavo@nvidia.com
Cc: ruifeng.wang@arm.com, matan@mellanox.com, stable@dpdk.org
Subject: [dpdk-stable] [PATCH] net/mlx5: remove unwanted barrier
Date: Sun,  6 Jun 2021 11:49:48 -0500	[thread overview]
Message-ID: <20210606164948.35997-1-honnappa.nagarahalli@arm.com> (raw)

The IO barrier is not required as cqe->op_own is read once. The
checks done on the local variable and the memory is not read again.

Fixes: 88c0733535d6 ("net/mlx5: extend Rx completion with error handling")
Cc: matan@mellanox.com
Cc: stable@dpdk.org

Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---
 drivers/common/mlx5/mlx5_common.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/common/mlx5/mlx5_common.h b/drivers/common/mlx5/mlx5_common.h
index 5028a05b49..a4c29f51f1 100644
--- a/drivers/common/mlx5/mlx5_common.h
+++ b/drivers/common/mlx5/mlx5_common.h
@@ -195,7 +195,7 @@ check_cqe(volatile struct mlx5_cqe *cqe, const uint16_t cqes_n,
 
 	if (unlikely((op_owner != (!!(idx))) || (op_code == MLX5_CQE_INVALID)))
 		return MLX5_CQE_STATUS_HW_OWN;
-	rte_io_rmb();
+
 	if (unlikely(op_code == MLX5_CQE_RESP_ERR ||
 		     op_code == MLX5_CQE_REQ_ERR))
 		return MLX5_CQE_STATUS_ERR;
-- 
2.17.1


             reply	other threads:[~2021-06-06 16:50 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-06 16:49 Honnappa Nagarahalli [this message]
2021-07-01 12:52 ` Slava Ovsiienko
2021-07-02 21:51   ` Honnappa Nagarahalli
2022-08-30 20:00 ` [PATCH v2] net/mlx5: use just sufficient barrier for Arm platforms Honnappa Nagarahalli
2022-09-27  6:34   ` Slava Ovsiienko
2022-09-27 21:03     ` Honnappa Nagarahalli
2022-11-15  1:45       ` Honnappa Nagarahalli
2023-03-07 16:07         ` Slava Ovsiienko
2023-03-09  2:42           ` Honnappa Nagarahalli
2022-09-27 21:06     ` Honnappa Nagarahalli
2023-03-09  2:32   ` [PATCH v3] net/mlx5: use just sufficient barrier for ARM platforms Honnappa Nagarahalli
2023-03-09 15:44     ` Slava Ovsiienko
2023-03-19 13:32     ` Raslan Darawsheh

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210606164948.35997-1-honnappa.nagarahalli@arm.com \
    --to=honnappa.nagarahalli@arm.com \
    --cc=dev@dpdk.org \
    --cc=matan@mellanox.com \
    --cc=matan@nvidia.com \
    --cc=ruifeng.wang@arm.com \
    --cc=shahafs@nvidia.com \
    --cc=stable@dpdk.org \
    --cc=viacheslavo@nvidia.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).