tree 4ae86fc3abfb67f840858783cd6a852178f2ed76
parent 1b77adb2c2ab8a7574e4d3bd5cafe02748f9ed24
author Kevin Yang <yyd@google.com> 1717450254 +0000
committer COS Cherry Picker <cloud-image-release@prod.google.com> 1719219822 -0700

tcp: add sysctl_tcp_rto_min_us

[ Upstream commit f086edef71be7174a16c1ed67ac65a085cda28b1 ]

Adding a sysctl knob to allow user to specify a default
rto_min at socket init time, other than using the hard
coded 200ms default rto_min.

Note that the rto_min route option has the highest precedence
for configuring this setting, followed by the TCP_BPF_RTO_MIN
socket option, followed by the tcp_rto_min_us sysctl.

BUG=b/345799473
TEST=presubmit
RELEASE_NOTE=None

cos-patch: bug
Signed-off-by: Kevin Yang <yyd@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Yuchung Cheng <ycheng@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Tony Lu <tonylu@linux.alibaba.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Change-Id: I5f1ef617eb30f9f4498a35035e6edc872b9a2e89
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/74721
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Arnav Kansal <rnv@google.com>
Main-Branch-Verified: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Kevin Berry <kpberry@google.com>