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authorYuchung Cheng <ycheng@google.com>2013-04-29 08:44:51 +0000
committerDavid S. Miller <davem@davemloft.net>2013-04-29 15:14:03 -0400
commitcd75eff64dae8856afbf6ef0f0ca3c145465d8e0 (patch)
tree2fc9c3079b60e4534935a4daaf6410485a477dd5
parent6a5dc9e598fe90160fee7de098fa319665f5253e (diff)
tcp: reset timer after any SYNACK retransmit
Linux immediately returns SYNACK on (spurious) SYN retransmits, but keeps the SYNACK timer running independently. Thus the timer may fire right after the SYNACK retransmit and causes a SYN-SYNACK cross-fire burst. Adopt the fast retransmit/recovery idea in established state by re-arming the SYNACK timer after the fast (SYNACK) retransmit. The timer may fire late up to 500ms due to the current SYNACK timer wheel, but it's OK to be conservative when network is congested. Eric's new listener design should address this issue. Signed-off-by: Yuchung Cheng <ycheng@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/tcp_minisocks.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 05eaf890461..0f017882725 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -551,8 +551,13 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,
*
* Note that even if there is new data in the SYN packet
* they will be thrown away too.
+ *
+ * Reset timer after retransmitting SYNACK, similar to
+ * the idea of fast retransmit in recovery.
*/
- inet_rtx_syn_ack(sk, req);
+ if (!inet_rtx_syn_ack(sk, req))
+ req->expires = min(TCP_TIMEOUT_INIT << req->num_timeout,
+ TCP_RTO_MAX) + jiffies;
return NULL;
}