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05 April 2024, 19:05:47 UTC
Revision 93b174ad71b08e504c2cf6e8a58ecce778b77a40 authored by Yuchung Cheng on 06 December 2012, 08:45:32 UTC, committed by David S. Miller on 07 December 2012, 19:39:28 UTC 
tcp: bug fix Fast Open client retransmission
 
If SYN-ACK partially acks SYN-data, the client retransmits the
remaining data by tcp_retransmit_skb(). This increments lost recovery
state variables like tp->retrans_out in Open state. If loss recovery
happens before the retransmission is acked, it triggers the WARN_ON
check in tcp_fastretrans_alert(). For example: the client sends
SYN-data, gets SYN-ACK acking only ISN, retransmits data, sends
another 4 data packets and get 3 dupacks.

Since the retransmission is not caused by network drop it should not
update the recovery state variables. Further the server may return a
smaller MSS than the cached MSS used for SYN-data, so the retranmission
needs a loop. Otherwise some data will not be retransmitted until timeout
or other loss recovery events.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 1afa471
History
Tip revision: 93b174ad71b08e504c2cf6e8a58ecce778b77a40 authored by Yuchung Cheng on 06 December 2012, 08:45:32 UTC
tcp: bug fix Fast Open client retransmission
Tip revision: 93b174a
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