From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755806Ab2GDUGQ (ORCPT ); Wed, 4 Jul 2012 16:06:16 -0400 Received: from mail.snarked.org ([67.43.172.250]:60116 "EHLO mail.snarked.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932239Ab2GDUGL (ORCPT ); Wed, 4 Jul 2012 16:06:11 -0400 X-Greylist: delayed 566 seconds by postgrey-1.27 at vger.kernel.org; Wed, 04 Jul 2012 16:06:11 EDT X-Envelope-From: (mail.snarked.org) To: linux-kernel@vger.kernel.org From: "D. Stussy" Newsgroups: linux.kernel,alt.comp.os.linux.networking Subject: Intel e1000 ethernet device, change in kernel v3.4, and jumbo frames setting DENIED. Date: Wed, 4 Jul 2012 12:56:44 -0700 Message-ID: Reply-To: "D. Stussy" Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset="utf-8"; reply-type=original Content-Transfer-Encoding: 7bit X-No-Archive: Yes X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3555.308 X-Newsreader: Microsoft Windows Live Mail 15.4.3555.308 Importance: Normal X-Priority: 3 X-MSMail-Priority: Normal Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There has been some changes to the driver such that things like checksum verification is offloaded from the CPU. However, this blocks the ability to set a jumbo frame. The kernel does record an error indicating that checksum offloading need be disabled fro jumbo frame MTU sizes to be used. My e1000 interfaces use the 82574L chipset. 1) Was this an intentional change? 2) How do I disable that function so I can set jumbo frames with "ifconfig" or "ip"? I simply don't know what setting I need to pass. Exact kernel message: "Jumbo frames cannot be enabled when both receive checksum offload and receive hashing are enabled. Disable one of the receive offload features before enabling jumbos."