netdev - [PATCH net-next 0/4] net: tcp: make txhash use consistent for IPv4

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Message-Id: <20230427134527.18127-1-atenart@kernel.org>
Date:   Thu, 27 Apr 2023 15:45:23 +0200
From:   Antoine Tenart <atenart@...nel.org>
To:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com
Cc:     Antoine Tenart <atenart@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH net-next 0/4] net: tcp: make txhash use consistent for IPv4

Hello,

Series is divided in two parts. First two commits make the txhash (used
for the skb hash in TCP) to be consistent for all IPv4/TCP packets (IPv6
doesn't have the same issue). Last two commits improve doc/comment
hash-related parts.

One example is when using OvS with dp_hash, which uses skb->hash, to
select a path. We'd like packets from the same flow to be consistent, as
well as the hash being stable over time when using net.core.txrehash=0.
Same applies for kernel ECMP which also can use skb->hash.

IMHO the series makes sense in net-next, but we could argue (some)
commits be seen as fixes and I can resend if necessary.

Thanks!
Antoine

Antoine Tenart (4):
  net: tcp: make the txhash available in TIME_WAIT sockets for IPv4 too
  net: ipv4: use consistent txhash in TIME_WAIT and SYN_RECV
  Documentation: net: net.core.txrehash is not specific to listening
    sockets
  net: skbuff: fix l4_hash comment

 Documentation/admin-guide/sysctl/net.rst |  4 ++--
 include/linux/skbuff.h                   |  4 ++--
 include/net/ip.h                         |  2 +-
 net/ipv4/ip_output.c                     |  4 +++-
 net/ipv4/tcp_ipv4.c                      | 14 +++++++++-----
 net/ipv4/tcp_minisocks.c                 |  2 +-
 6 files changed, 18 insertions(+), 12 deletions(-)

-- 
2.40.0