netdev - Re: [PATCH] tcp: detect SYN/data drop when F-RTO is disabled

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Date:	Thu, 31 Jan 2013 14:21:22 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ycheng@...gle.com
Cc:	ncardwell@...gle.com, edumazet@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH] tcp: detect SYN/data drop when F-RTO is disabled

From: Yuchung Cheng <ycheng@...gle.com>
Date: Thu, 31 Jan 2013 11:16:46 -0800

> 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@...gle.com>

Applied, thanks.
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