netdev - [PATCH net-next 0/7] ipv6: tcp: no longer rebuild fl6 at each transmit

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Message-ID: <20260206173426.1638518-1-edumazet@google.com>
Date: Fri,  6 Feb 2026 17:34:19 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, Neal Cardwell <ncardwell@...gle.com>, 
	Kuniyuki Iwashima <kuniyu@...gle.com>, David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 0/7] ipv6: tcp: no longer rebuild fl6 at each transmit

TCP v6 spends a good amount of time rebuilding a fresh fl6 at each
transmit in inet6_csk_xmit()/inet6_csk_route_socket().

TCP v4 caches the information in inet->cork.fl.u.ip4 instead.

This series changes TCP v6 to behave the same, saving cpu cycles
and reducing cache line misses and stack use.

Eric Dumazet (7):
  ipv6: add daddr/final storage in struct ipv6_pinfo
  ipv6: use np->final in inet6_sk_rebuild_header()
  ipv6: use inet->cork.fl.u.ip6 and np->final in
    ip6_datagram_dst_update()
  ipv6: inet6_csk_xmit() and inet6_csk_update_pmtu() use
    inet->cork.fl.u.ip6
  tcp: populate inet->cork.fl.u.ip6 in tcp_v6_connect()
  tcp: populate inet->cork.fl.u.ip6 in tcp_v6_syn_recv_sock()
  tcp: inet6_csk_xmit() optimization

 include/linux/ipv6.h                |  4 ++
 include/net/inet6_connection_sock.h |  4 +-
 net/ipv6/af_inet6.c                 |  4 +-
 net/ipv6/datagram.c                 | 21 +++++-----
 net/ipv6/inet6_connection_sock.c    | 57 +++++++++++++------------
 net/ipv6/tcp_ipv6.c                 | 64 ++++++++++++++---------------
 6 files changed, 82 insertions(+), 72 deletions(-)

-- 
2.53.0.rc2.204.g2597b5adb4-goog