netdev - [PATCH net-next 0/5] tcp: allow to reduce max RTO

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Message-ID: <20250207152830.2527578-1-edumazet@google.com>
Date: Fri,  7 Feb 2025 15:28:25 +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: netdev@...r.kernel.org, Neal Cardwell <ncardwell@...gle.com>, 
	Kuniyuki Iwashima <kuniyu@...zon.com>, Jason Xing <kernelxing@...cent.com>, 
	Simon Horman <horms@...nel.org>, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 0/5] tcp: allow to reduce max RTO

This is a followup of a discussion started 6 months ago
by Jason Xing.

Some applications want to lower the time between each
retransmit attempts.

TCP_KEEPINTVL and TCP_KEEPCNT socket options don't
work around the issue.

This series adds:

- a new TCP level socket option (TCP_RTO_MAX_MS)
- a new sysctl (/proc/sys/net/ipv4/tcp_rto_max_ms)

Admins and/or applications can now change the max rto value
at their own risk.

Link: https://lore.kernel.org/netdev/20240715033118.32322-1-kerneljasonxing@gmail.com/T/

Eric Dumazet (5):
  tcp: remove tcp_reset_xmit_timer() @max_when argument
  tcp: add a @pace_delay parameter to tcp_reset_xmit_timer()
  tcp: use tcp_reset_xmit_timer()
  tcp: add the ability to control max RTO
  tcp: add tcp_rto_max_ms sysctl

 Documentation/networking/ip-sysctl.rst        | 13 ++++++++
 .../net_cachelines/inet_connection_sock.rst   |  1 +
 .../net_cachelines/netns_ipv4_sysctl.rst      |  1 +
 include/net/inet_connection_sock.h            |  1 +
 include/net/netns/ipv4.h                      |  1 +
 include/net/tcp.h                             | 23 +++++++++-----
 include/uapi/linux/tcp.h                      |  1 +
 net/ipv4/sysctl_net_ipv4.c                    | 10 ++++++
 net/ipv4/tcp.c                                | 14 ++++++++-
 net/ipv4/tcp_fastopen.c                       |  4 +--
 net/ipv4/tcp_input.c                          | 19 +++++-------
 net/ipv4/tcp_ipv4.c                           |  6 ++--
 net/ipv4/tcp_output.c                         | 17 +++++-----
 net/ipv4/tcp_timer.c                          | 31 ++++++++++---------
 14 files changed, 93 insertions(+), 49 deletions(-)

-- 
2.48.1.502.g6dc24dfdaf-goog