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| author | Takashi Iwai <tiwai@suse.de> | 2015-12-21 13:46:30 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2015-12-21 13:46:30 +0300 |
| commit | 1d9d4495001d3c470e5c902ff35a6aa626924fc1 (patch) | |
| tree | 1ae39f4ccadb610bc16fea88a1f93b23a4df37b1 /net/ipv4/tcp_timer.c | |
| parent | d3d33aabac51341065bcce0e9c2d9d27902a08c4 (diff) | |
| parent | e2dc7d7d8ed3019f72855af1c3dcda3fb456b488 (diff) | |
| download | linux-1d9d4495001d3c470e5c902ff35a6aa626924fc1.tar.xz | |
Merge branch 'topic/hdmi-jack' into for-next
Diffstat (limited to 'net/ipv4/tcp_timer.c')
| -rw-r--r-- | net/ipv4/tcp_timer.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c index c9c716a483e4..193ba1fa8a9a 100644 --- a/net/ipv4/tcp_timer.c +++ b/net/ipv4/tcp_timer.c @@ -168,7 +168,7 @@ static int tcp_write_timeout(struct sock *sk) dst_negative_advice(sk); if (tp->syn_fastopen || tp->syn_data) tcp_fastopen_cache_set(sk, 0, NULL, true, 0); - if (tp->syn_data) + if (tp->syn_data && icsk->icsk_retransmits == 1) NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPFASTOPENACTIVEFAIL); } @@ -176,6 +176,18 @@ static int tcp_write_timeout(struct sock *sk) syn_set = true; } else { if (retransmits_timed_out(sk, sysctl_tcp_retries1, 0, 0)) { + /* Some middle-boxes may black-hole Fast Open _after_ + * the handshake. Therefore we conservatively disable + * Fast Open on this path on recurring timeouts with + * few or zero bytes acked after Fast Open. + */ + if (tp->syn_data_acked && + tp->bytes_acked <= tp->rx_opt.mss_clamp) { + tcp_fastopen_cache_set(sk, 0, NULL, true, 0); + if (icsk->icsk_retransmits == sysctl_tcp_retries1) + NET_INC_STATS_BH(sock_net(sk), + LINUX_MIB_TCPFASTOPENACTIVEFAIL); + } /* Black hole detection */ tcp_mtu_probing(icsk, sk); |