From: Yuchung Cheng <ycheng@google.com>
Date: Thu, 31 Jan 2013 19:16:46 +0000 (-0800)
Subject: tcp: detect SYN/data drop when F-RTO is disabled
X-Git-Tag: v3.8-rc7~2^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=66555e92fb7a619188c02cceae4bbc414f15f96d;p=pandora-kernel.git

tcp: detect SYN/data drop when F-RTO is disabled

On receiving the SYN-ACK, Fast Open checks icsk_retransmit for SYN
retransmission to detect SYN/data drops. But if F-RTO is disabled,
icsk_retransmit is reset at step D of tcp_fastretrans_alert() (
under tcp_ack()) before tcp_rcv_fastopen_synack(). The fix is to use
total_retrans instead which accounts for SYN retransmission regardless
the use of F-RTO.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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