diff options
| author | Dave Airlie <airlied@redhat.com> | 2015-12-08 11:04:26 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2015-12-08 11:04:26 +1000 |
| commit | e876b41ab074561d65f213bf5e0fc68cf5bc7380 (patch) | |
| tree | 5bcbd7e4f7b6ac2a34e61011f8eb2cde90bf8603 /net/ipv4/tcp_timer.c | |
| parent | 47c0fd72822159eb501411f975f5672a0bf7a7fb (diff) | |
| parent | 527e9316f8ec44bd53d90fb9f611fa7ffff52bb9 (diff) | |
Back merge tag 'v4.4-rc4' into drm-next
We've picked up a few conflicts and it would be nice
to resolve them before we move onwards.
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); |