patches for DPDK stable branches
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From: Alexander Kozyrev <akozyrev@nvidia.com>
To: dev@dpdk.org
Cc: stable@dpdk.org, rasland@nvidia.com, dekelp@nvidia.com, matan@nvidia.com
Subject: [dpdk-stable] [PATCH] net/mlx5: fix packet padding config for RxQ via DevX
Date: Sun, 15 Nov 2020 14:25:34 +0000
Message-ID: <20201115142534.31383-1-akozyrev@nvidia.com> (raw)

Received packets can be aligned to the size of the cache line on
PCI transactions. This could improve performance by avoiding
partial cache line writes in exchange for increased PCI bandwidth.

This feature is supposed to be controlled by the rxq_pkt_pad_en
devarg and it is true for an RxQ created via the Verbs API.
But in the DevX API case, it is erroneously controlled by the
rxq_cqe_pad_en devarg instead, which is in charge of the CQE
padding instead and should not control the RxQ creation.

Fix DevX RxQ creation by using the proper configuration flag for
Rx packet padding that is being set by the rxq_pkt_pad_en devarg.

Fixes: dc9ceff73c ("net/mlx5: create advanced RxQ via DevX")
Cc: stable@dpdk.org

Signed-off-by: Alexander Kozyrev <akozyrev@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
---
 drivers/net/mlx5/mlx5_devx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_devx.c b/drivers/net/mlx5/mlx5_devx.c
index e9ceda5caf..34044fcb0c 100644
--- a/drivers/net/mlx5/mlx5_devx.c
+++ b/drivers/net/mlx5/mlx5_devx.c
@@ -294,7 +294,7 @@ static void
 mlx5_devx_wq_attr_fill(struct mlx5_priv *priv, struct mlx5_rxq_ctrl *rxq_ctrl,
 		       struct mlx5_devx_wq_attr *wq_attr)
 {
-	wq_attr->end_padding_mode = priv->config.cqe_pad ?
+	wq_attr->end_padding_mode = priv->config.hw_padding ?
 					MLX5_WQ_END_PAD_MODE_ALIGN :
 					MLX5_WQ_END_PAD_MODE_NONE;
 	wq_attr->pd = priv->sh->pdn;
-- 
2.24.1


             reply	other threads:[~2020-11-15 14:25 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-15 14:25 Alexander Kozyrev [this message]
2020-11-17 10:52 ` Raslan Darawsheh

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