linux-kernel - Re: [PATCH v2] net: preserve IP control block during GSO segmentation

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Message-Id: <20160115.143553.1070533798353652921.davem@davemloft.net>
Date:	Fri, 15 Jan 2016 14:35:53 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	fw@...len.de
Cc:	koct9i@...il.com, netdev@...r.kernel.org, dev@...nvswitch.org,
	cascardo@...hat.com, edumazet@...gle.com,
	linux-kernel@...r.kernel.org, pshelar@...ira.com,
	xiyou.wangcong@...il.com
Subject: Re: [PATCH v2] net: preserve IP control block during GSO
 segmentation

From: Florian Westphal <fw@...len.de>
Date: Thu, 14 Jan 2016 00:36:28 +0100

> David Miller <davem@...emloft.net> wrote:
>> From: Konstantin Khlebnikov <koct9i@...il.com>
>> Date: Fri, 08 Jan 2016 15:21:46 +0300
>> 
>> > Skb_gso_segment() uses skb control block during segmentation.
>> > This patch adds 32-bytes room for previous control block which
>> > will be copied into all resulting segments.
>> > 
>> > This patch fixes kernel crash during fragmenting forwarded packets.
>> > Fragmentation requires valid IP CB in skb for clearing ip options.
>> > Also patch removes custom save/restore in ovs code, now it's redundant.
>> > 
>> > Signed-off-by: Konstantin Khlebnikov <koct9i@...il.com>
>> > Link: http://lkml.kernel.org/r/CALYGNiP-0MZ-FExV2HutTvE9U-QQtkKSoE--KN=JQE5STYsjAA@mail.gmail.com
>> 
>> If this works I definitely prefer this approach to the other patch
>> where the CB is copied back and forth.
> 
> I quite frankly don't care and just like you to apply one or the other;
> use coin toss if needed :-}

So I am going to apply this patch from Konstantin and queued it up for -stable.

Thanks.