From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263769AbUILXAc (ORCPT ); Sun, 12 Sep 2004 19:00:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263770AbUILXAc (ORCPT ); Sun, 12 Sep 2004 19:00:32 -0400 Received: from adsl-63-197-226-105.dsl.snfc21.pacbell.net ([63.197.226.105]:39582 "EHLO cheetah.davemloft.net") by vger.kernel.org with ESMTP id S263769AbUILXAW convert rfc822-to-8bit (ORCPT ); Sun, 12 Sep 2004 19:00:22 -0400 Date: Sun, 12 Sep 2004 15:58:50 -0700 From: "David S. Miller" To: David Woodhouse Cc: ag@roxor.be, linux-kernel@vger.kernel.org Subject: Re: iMac G3 IPv6 issue Message-Id: <20040912155850.0e8fd0b5.davem@davemloft.net> In-Reply-To: <1095011851.4995.54.camel@localhost.localdomain> References: <20040912133936.GA11099@caladan.roxor.be> <1095011851.4995.54.camel@localhost.localdomain> X-Mailer: Sylpheed version 0.9.12 (GTK+ 1.2.10; sparc-unknown-linux-gnu) X-Face: "_;p5u5aPsO,_Vsx"^v-pEq09'CU4&Dc1$fQExov$62l60cgCc%FnIwD=.UF^a>?5'9Kn[;433QFVV9M..2eN.@4ZWPGbdi<=?[:T>y?SD(R*-3It"Vj:)"dP Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 12 Sep 2004 18:57:31 +0100 David Woodhouse wrote: > On Sun, 2004-09-12 at 15:39 +0200, Aurélien GÉRÔME wrote: > > I put IPv6 support, but the console is flooded by a lot of: > > hw tcp v6 csum failed > > However, IPv6 works, and IPv4 packets do not have this kind of issue. > > The network card is a Sun Gem. It is kind of weird to see bad packets. > > I use the sungem in a similar machine with IPv6, and haven't seen any > problems. Can you tcpdump from a different machine on the network and > confirm whether these reported bad checksums really are happening or if > it's the fault of the hardware/driver? One thing that's interesting is that the sungem and sunhme drivers are the only two in the whole tree that support IPV6 checksum offload. Like David, I have never seen this problem on Sparc systems using the GEM chip and this driver.