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authorYuchung Cheng <ycheng@google.com>2017-12-12 13:10:40 -0800
committerDavid S. Miller <davem@davemloft.net>2017-12-13 15:51:12 -0500
commit7268586baa530312041e597b518b5c6a05110df1 (patch)
tree09075b8fb35fcc5ad90f744345d1582fe7d62f4c /include/net/tcp.h
parent8a83c5d7969b8433584e3cf658a8d76c4dc37f4d (diff)
downloadlinux-7268586baa530312041e597b518b5c6a05110df1.tar.bz2
tcp: pause Fast Open globally after third consecutive timeout
Prior to this patch, active Fast Open is paused on a specific destination IP address if the previous connections to the IP address have experienced recurring timeouts . But recent experiments by Microsoft (https://goo.gl/cykmn7) and Mozilla browsers indicate the isssue is often caused by broken middle-boxes sitting close to the client. Therefore it is much better user experience if Fast Open is disabled out-right globally to avoid experiencing further timeouts on connections toward other destinations. This patch changes the destination-IP disablement to global disablement if a connection experiencing recurring timeouts or aborts due to timeout. Repeated incidents would still exponentially increase the pause time, starting from an hour. This is extremely conservative but an unfortunate compromise to minimize bad experience due to broken middle-boxes. Reported-by: Dragana Damjanovic <ddamjanovic@mozilla.com> Reported-by: Patrick McManus <mcmanus@ducksong.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Reviewed-by: Wei Wang <weiwan@google.com> Reviewed-by: Neal Cardwell <ncardwell@google.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/tcp.h')
-rw-r--r--include/net/tcp.h5
1 files changed, 2 insertions, 3 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 3c3744e52cd1..6939e69d3c37 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1507,8 +1507,7 @@ int tcp_md5_hash_key(struct tcp_md5sig_pool *hp,
/* From tcp_fastopen.c */
void tcp_fastopen_cache_get(struct sock *sk, u16 *mss,
- struct tcp_fastopen_cookie *cookie, int *syn_loss,
- unsigned long *last_syn_loss);
+ struct tcp_fastopen_cookie *cookie);
void tcp_fastopen_cache_set(struct sock *sk, u16 mss,
struct tcp_fastopen_cookie *cookie, bool syn_lost,
u16 try_exp);
@@ -1546,7 +1545,7 @@ extern unsigned int sysctl_tcp_fastopen_blackhole_timeout;
void tcp_fastopen_active_disable(struct sock *sk);
bool tcp_fastopen_active_should_disable(struct sock *sk);
void tcp_fastopen_active_disable_ofo_check(struct sock *sk);
-void tcp_fastopen_active_timeout_reset(void);
+void tcp_fastopen_active_detect_blackhole(struct sock *sk, bool expired);
/* Latencies incurred by various limits for a sender. They are
* chronograph-like stats that are mutually exclusive.