netdev - Re: GREv4 ipv6 is broken for UDP stream on 3.9

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Message-ID: <CALnjE+pHEqdZ9KADF9L+8WfGwi+q-NgXSR7bnEiz4BhArY7q-w@mail.gmail.com>
Date:	Thu, 30 May 2013 09:46:15 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Dmitry Kravkov <dkravkov@...il.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: GREv4 ipv6 is broken for UDP stream on 3.9

I sent out fix "udp6: Fix udp fragmentation for tunnel traffic."
Can you give it a try ?

Thanks.

On Wed, May 29, 2013 at 1:16 AM, Dmitry Kravkov <dkravkov@...il.com> wrote:
> Hi,
>
> since 3.9-rc1 i see that rx side drops all data packets for:
>
> netperf -6 -t UDP_STREAM -H fe80::5efe:c0a8:630c%gre_7 -l 1
>
> when gre_7 is:
>
> 13: gre_7: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1476 qdisc noqueue state UNKNOWN
>     link/gre 192.168.99.29 peer 192.168.99.12
>
> The packets just gets corrupted.
>
> This bisected to:
> commit 68c331631143f5f039baac99a650e0b9e1ea02b6
> Author: Pravin B Shelar <pshelar@...ira.com>
> Date:   Thu Feb 14 14:02:41 2013 +0000
>
>     v4 GRE: Add TCP segmentation offload for GRE
>
> Looks like gre_gso_segment build wrong segments for GSO flow.
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