netdev - [BUG] ipv6 and TSO on GRE is broken

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Date:	Wed, 01 May 2013 08:53:42 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	netdev <netdev@...r.kernel.org>
Cc:	Pravin B Shelar <pshelar@...ira.com>,
	"Steinar H. Gunderson" <sesse@...gle.com>
Subject: [BUG] ipv6 and TSO on GRE is broken

This was reported by Steinar.

Sending this to netdev, as I wont have time to debug this in the near
future. (~ 3 days)

3.9 and latest net-next are broken for IPv6 on top of GRE tunnel

GSO seems OK, but TSO not :

lpq83:~# ethtool -K gre1 tso off gso on 
lpq83:~# netperf -H 4444::555:0084
MIGRATED TCP STREAM TEST from ::0 (::) port 0 AF_INET6 to 4444::555:0084
() port 0 AF_INET6
Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 87380  16384  16384    10.00    3789.10   
lpq83:~# ethtool -K gre1 tso on
lpq83:~# netperf -H 4444::555:0084
MIGRATED TCP STREAM TEST from ::0 (::) port 0 AF_INET6 to 4444::555:0084
() port 0 AF_INET6
Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 87380  16384  16384    10.00     321.27   

No problem for IPv4

Thanks

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