netdev - Re: [PATCH v2 1/1] tcp: fixing TLP's FIN recovery

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Message-Id: <20141007.161713.27716499707772337.davem@davemloft.net>
Date:	Tue, 07 Oct 2014 16:17:13 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	joshhunt00@...il.com
Cc:	per.hurtig@....se, eric.dumazet@...il.com, panweiping3@...il.com,
	nanditad@...gle.com, netdev@...r.kernel.org, anna.brunstrom@....se,
	mohammad.rajiullah@....se, ncardwell@...gle.com,
	sergei.shtylyov@...entembedded.com
Subject: Re: [PATCH v2 1/1] tcp: fixing TLP's FIN recovery

From: Josh Hunt <joshhunt00@...il.com>
Date: Tue, 7 Oct 2014 10:03:29 -0500

> On Thu, Jun 12, 2014 at 1:06 PM, David Miller <davem@...emloft.net> wrote:
>> From: Per Hurtig <per.hurtig@....se>
>> Date: Thu, 12 Jun 2014 17:08:32 +0200
>>
>>> Fix to a problem observed when losing a FIN segment that does not
>>> contain data.  In such situations, TLP is unable to recover from
>>> *any* tail loss and instead adds at least PTO ms to the
>>> retransmission process, i.e., RTO = RTO + PTO.
>>>
>>> Signed-off-by: Per Hurtig <per.hurtig@....se>
>>
>> Applied, thanks.
> 
> Can we queue this up for stable? 2cd0d743b05e87 (tcp: fix
> tcp_match_skb_to_sack() for unaligned SACK at end of an skb) is
> already in stable and based on the changelog was put in place to fix a
> case that this patch introduced:
> 
> "This was visible now because the recently simplified TLP logic in
>  bef1909ee3ed1c ("tcp: fixing TLP's FIN recovery") could find that 0-byte
>  skb at the end of the write queue, and now that we do not check that
>  skb's length we could send it as a TLP probe."
> 
> However, the patch to fix TLP's FIN recovery is not in -stable.

Queued up for -stable, thanks.
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