netdev - GREv4 ipv6 is broken for UDP stream on 3.9

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Date:	Wed, 29 May 2013 11:16:21 +0300
From:	Dmitry Kravkov <dkravkov@...il.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:	Pravin B Shelar <pshelar@...ira.com>
Subject: GREv4 ipv6 is broken for UDP stream on 3.9

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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