netdev - [PATCH net-next 0/2] net/mlx5: Avoid payload in skb's linear part for better GRO-processing

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Message-Id: <20250713-cpaasch-pf-927-netmlx5-avoid-copying-the-payload-to-the-malloced-area-v1-0-ecaed8c2844e@openai.com>
Date: Sun, 13 Jul 2025 16:33:05 -0700
From: Christoph Paasch via B4 Relay <devnull+cpaasch.openai.com@...nel.org>
To: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>, 
 Tariq Toukan <tariqt@...dia.com>, Mark Bloch <mbloch@...dia.com>, 
 Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: linux-rdma@...r.kernel.org, netdev@...r.kernel.org, 
 Christoph Paasch <cpaasch@...nai.com>
Subject: [PATCH net-next 0/2] net/mlx5: Avoid payload in skb's linear part
 for better GRO-processing

When LRO is enabled on the MLX, mlx5e_skb_from_cqe_mpwrq_nonlinear
copies parts of the payload to the linear part of the skb.

This triggers suboptimal processing in GRO, causing slow throughput,...

This patch series addresses this by copying a lower-bound estimate of
the protocol headers - trying to avoid the payload part. This results in
a significant throughput improvement (detailled results in the specific
patch).

Signed-off-by: Christoph Paasch <cpaasch@...nai.com>
---
Christoph Paasch (2):
      net/mlx5: Bring back get_cqe_l3_hdr_type
      net/mlx5: Avoid copying payload to the skb's linear part

 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 33 ++++++++++++++++++++++++-
 include/linux/mlx5/device.h                     | 12 ++++++++-
 2 files changed, 43 insertions(+), 2 deletions(-)
---
base-commit: a52f9f0d77f20efc285908a28b5697603b6597c7
change-id: 20250712-cpaasch-pf-927-netmlx5-avoid-copying-the-payload-to-the-malloced-area-6524917455a6

Best regards,
-- 
Christoph Paasch <cpaasch@...nai.com>