netdev - [RFC PATCH 0/2] net: gro: avoid touching transport header

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Message-ID: <cover.1764943231.git.pabeni@redhat.com>
Date: Fri,  5 Dec 2025 15:03:29 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Simon Horman <horms@...nel.org>,
	Neal Cardwell <ncardwell@...gle.com>,
	Kuniyuki Iwashima <kuniyu@...gle.com>,
	David Ahern <dsahern@...nel.org>
Subject: [RFC PATCH 0/2] net: gro: avoid touching transport header

This series is basically a pre-req for GRO support for double UDP
encapsulation:

https://lore.kernel.org/netdev/cover.1764056123.git.pabeni@redhat.com/

that otherwise would requiring explicitly disabling gro on the outer
geneve device.

I *think* it should also help plain TCP GRO performances, even if don't
have a very high speed, full zero-copy, big TCP testbed handy to
actually prove it - see patch 1 for the gory details.

Paolo Abeni (2):
  net: gro: avoid relaying on skb->transport_header at receive time
  net: gro: set the transport header later

 include/net/gro.h        | 26 ++++++++++++++++++++++++++
 include/net/tcp.h        |  3 ++-
 net/ipv4/af_inet.c       |  2 +-
 net/ipv4/tcp_offload.c   | 16 +++++++++-------
 net/ipv4/udp_offload.c   |  8 ++++++--
 net/ipv6/ip6_offload.c   |  3 +--
 net/ipv6/tcpv6_offload.c |  2 +-
 7 files changed, 46 insertions(+), 14 deletions(-)

-- 
2.52.0