tcp: fix SYNACK RTT estimation in Fast Open

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tp->lsndtime may not always be the SYNACK timestamp if a passive
Fast Open socket sends data before handshake completes. And if the
remote acknowledges both the data and the SYNACK, the RTT sample
is already taken in tcp_ack(), so no need to call
tcp_update_ack_rtt() in tcp_synack_rtt_meas() aagain.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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Yuchung Cheng 2013-10-24 08:44:25 -07:00 • committed by David S. Miller

parent e9e2a904ef

commit bc15afa39e

1 changed files with 13 additions and 5 deletions

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18

net/ipv4/tcp_input.c

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