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| author | Enke Chen <enchen@paloaltonetworks.com> | 2021-01-22 11:13:06 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-03 23:28:51 +0100 |
| commit | 011c3d9427da318472d1e6f7de518cc288039927 (patch) | |
| tree | d2520d311f37d99cd0a55bae721c113920a689c8 /include | |
| parent | bcc83b43e1edde77fba694a6e8ca21290f610fb6 (diff) | |
| download | linux-011c3d9427da318472d1e6f7de518cc288039927.tar.gz linux-011c3d9427da318472d1e6f7de518cc288039927.tar.bz2 linux-011c3d9427da318472d1e6f7de518cc288039927.zip | |
tcp: make TCP_USER_TIMEOUT accurate for zero window probes
commit 344db93ae3ee69fc137bd6ed89a8ff1bf5b0db08 upstream.
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 b701a99e431d ("tcp: Add
tcp_clamp_rto_to_user_timeout() helper to improve accuracy").
Fixes: 9721e709fa68 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/tcp.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index d4ef5bf94168..5f55b1fa7772 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -625,6 +625,7 @@ static inline void tcp_clear_xmit_timers(struct sock *sk) unsigned int tcp_sync_mss(struct sock *sk, u32 pmtu); unsigned int tcp_current_mss(struct sock *sk); +u32 tcp_clamp_probe0_to_user_timeout(const struct sock *sk, u32 when); /* Bound MSS / TSO packet size with the half of the window */ static inline int tcp_bound_to_half_wnd(struct tcp_sock *tp, int pktsize) |