[SRU][jammy:linux-gcp][PATCH 0/3] Backport sysctl_tcp_rto_min_us

[Vinicius Peixoto]

BugLink: https://bugs.launchpad.net/bugs/2076950

[Impact]

Google has requested backports for the following upstream patches:

f086edef71be7174a16c1ed67ac65a085cda28b1 tcp: add sysctl_tcp_rto_min_us
5258da376f3c51332f917087361caf4c76e9e84f tcp: derive delack_max with tcp_rto_min helper

[Fix]

Noble:
* Backported due to context conflicts
Jammy: 
* Clean cherry-pick for pre-req commit f086edef71be
* Fixed context the same context conflicts as Noble, plus a few others
  due to other missing commits that add unrelated TCP sysctls

[Test plan]
* Build and boot tested
* Tested if the new sysctl was added:
    $ sysctl net.ipv4.tcp_rto_min_us
    net.ipv4.tcp_rto_min_us = 200000
    $ sysctl -w net.ipv4.tcp_rto_min_us=50000
    net.ipv4.tcp_rto_min_us = 50000
* Ran the kernel selftests in tools/testing/selftests/net to ensure
  basic network functionality wasn't compromised

[Where problems could occur]
Since this this adds new networking functionality, any problems here
would impact networking on affected systems.

[Other info]
#SF 00392021

Eric Dumazet (1):
  tcp: derive delack_max from rto_min

Kevin Yang (2):
  tcp: derive delack_max with tcp_rto_min helper
  tcp: add sysctl_tcp_rto_min_us

 Documentation/networking/ip-sysctl.rst | 13 +++++++++++++
 include/net/netns/ipv4.h               |  1 +
 include/net/tcp.h                      |  2 ++
 net/ipv4/sysctl_net_ipv4.c             |  8 ++++++++
 net/ipv4/tcp.c                         |  7 +++++--
 net/ipv4/tcp_ipv4.c                    |  2 ++
 net/ipv4/tcp_output.c                  |  9 ++++++++-
 7 files changed, 39 insertions(+), 3 deletions(-)

-- 
2.43.0