tcp: make TCP_USER_TIMEOUT accurate for zero window probes
The TCP_USER_TIMEOUT is checked by the 0-window probe timer. As the timer has backoff with a max interval of about two minutes, the actual timeout for TCP_USER_TIMEOUT can be off by up to two minutes. In this patch the TCP_USER_TIMEOUT is made more accurate by taking it into account when computing the timer value for the 0-window probes. This patch is similar to and builds on top of the one that made TCP_USER_TIMEOUT accurate for RTOs in commit b701a99e ("tcp: Add tcp_clamp_rto_to_user_timeout() helper to improve accuracy"). Fixes: 9721e709 ("tcp: simplify window probe aborting on USER_TIMEOUT") Signed-off-by:Enke Chen <enchen@paloaltonetworks.com> Reviewed-by:
Neal Cardwell <ncardwell@google.com> Signed-off-by:
Eric Dumazet <edumazet@google.com> Link: https://lore.kernel.org/r/20210122191306.GA99540@localhost.localdomain Signed-off-by:
Jakub Kicinski <kuba@kernel.org>
parent
3a30537c
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