netdev - Re: [PATCH net] tcp: avoid setting cwnd to invalid ssthresh after cwnd reduction states

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Date:   Wed, 02 Aug 2017 10:51:36 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     ycheng@...gle.com
Cc:     netdev@...r.kernel.org, ncardwell@...gle.com, edumazet@...gle.com
Subject: Re: [PATCH net] tcp: avoid setting cwnd to invalid ssthresh after
 cwnd reduction states

From: Yuchung Cheng <ycheng@...gle.com>
Date: Tue,  1 Aug 2017 13:22:32 -0700

> If the sender switches the congestion control during ECN-triggered
> cwnd-reduction state (CA_CWR), upon exiting recovery cwnd is set to
> the ssthresh value calculated by the previous congestion control. If
> the previous congestion control is BBR that always keep ssthresh
> to TCP_INIFINITE_SSTHRESH, cwnd ends up being infinite. The safe
> step is to avoid assigning invalid ssthresh value when recovery ends.
> 
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>

Applied, thanks.

Is this a -stable candidate?