From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266129AbUG1WeG (ORCPT ); Wed, 28 Jul 2004 18:34:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266685AbUG1WdW (ORCPT ); Wed, 28 Jul 2004 18:33:22 -0400 Received: from ns1.lanforge.com ([66.165.47.210]:2018 "EHLO www.lanforge.com") by vger.kernel.org with ESMTP id S266129AbUG1Wa7 (ORCPT ); Wed, 28 Jul 2004 18:30:59 -0400 Message-ID: <4108291D.7000804@candelatech.com> Date: Wed, 28 Jul 2004 15:30:53 -0700 From: Ben Greear Organization: Candela Technologies User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040113 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Alan Cox CC: linux-kernel@vger.kernel.org Subject: Re: PATCH: VLAN support for 3c59x/3c90x References: <20040728124256.GA31246@devserv.devel.redhat.com> <41081BC4.6040607@candelatech.com> <20040728221554.GA22747@devserv.devel.redhat.com> In-Reply-To: <20040728221554.GA22747@devserv.devel.redhat.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Alan Cox wrote: > On Wed, Jul 28, 2004 at 02:33:56PM -0700, Ben Greear wrote: > >>>Stefan de Konink ported this code from the 2.4 VLAN patches and tested it >>>extensively. I cleaned up the ifdefs and fixed a problem with bracketing >>>that made older cards fail. >> >>I am sure this will be appreciated by the VLAN users! >> >>Also, do you happen to know how large of an MTU these cards >>can support? > > > In VLAN mode they support just the extra VLAN bits, with the length > checking turned off its either FDDI or jumbo frame size but I don't remember > which. I think FDDI. So if you try to configure the MTU to 1504 using ifconfig or whatever, will that actually work? One reason I ask is that I saw a report of a bug/issue where it was not possible to send a raw-packet from user space that is bigger than the MTU. This would preclude user-space from generating a VLAN packet with the extra 4 bytes. Being able to change the MTU would at least partially work around this issue. Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com