netdev - Re: [PATCH net] tcp: fix DSACK-based undo on non-duplicate ACK

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Message-Id: <20171105.231718.1729738107149124866.davem@davemloft.net>
Date:   Sun, 05 Nov 2017 23:17:18 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     priyarjha@...gle.com
Cc:     netdev@...r.kernel.org, ycheng@...gle.com, ncardwell@...gle.com
Subject: Re: [PATCH net] tcp: fix DSACK-based undo on non-duplicate ACK

From: Priyaranjan Jha <priyarjha@...gle.com>
Date: Fri,  3 Nov 2017 17:46:55 -0700

> Fixes DSACK-based undo when sender is in Open State and
> an ACK advances snd_una.
> 
> Example scenario:
> - Sender goes into recovery and makes some spurious rtx.
> - It comes out of recovery and enters into open state.
> - It sends some more packets, let's say 4.
> - The receiver sends an ACK for the first two, but this ACK is lost.
> - The sender receives ack for first two, and DSACK for previous
>   spurious rtx.
> 
> Signed-off-by: Priyaranjan Jha <priyarjha@...gle.com>
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>
> Acked-by: Yousuk Seung <ysseung@...gle.com>

Applied, thanks.