From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: [BUG] ipv6 and TSO on GRE is broken Date: Wed, 01 May 2013 08:53:42 -0700 Message-ID: <1367423622.11020.54.camel@edumazet-glaptop> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: Pravin B Shelar , "Steinar H. Gunderson" To: netdev Return-path: Received: from mail-pd0-f182.google.com ([209.85.192.182]:49245 "EHLO mail-pd0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761541Ab3EAPxp (ORCPT ); Wed, 1 May 2013 11:53:45 -0400 Received: by mail-pd0-f182.google.com with SMTP id 14so874275pdj.41 for ; Wed, 01 May 2013 08:53:45 -0700 (PDT) Sender: netdev-owner@vger.kernel.org List-ID: 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