From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Dillow Subject: Re: r8169, enabling TX checksumming breaks things? Date: Wed, 23 Sep 2009 10:02:24 -0400 Message-ID: <1253714544.3925.6.camel@lap75545.ornl.gov> References: <200909230915.27854.denys@visp.net.lb> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: romieu@fr.zoreil.com, netdev@vger.kernel.org To: Denys Fedoryschenko Return-path: Received: from emroute1.ornl.gov ([160.91.4.119]:37545 "EHLO emroute1.ornl.gov" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753059AbZIWOCX (ORCPT ); Wed, 23 Sep 2009 10:02:23 -0400 Received: from emroute1.ornl.gov ([127.0.0.1]) by emroute1.ornl.gov (PMDF V6.4 #31561) with ESMTP id <0KQF00LOZGC2UF@emroute1.ornl.gov> for netdev@vger.kernel.org; Wed, 23 Sep 2009 10:02:27 -0400 (EDT) In-reply-to: <200909230915.27854.denys@visp.net.lb> Sender: netdev-owner@vger.kernel.org List-ID: On Wed, 2009-09-23 at 09:15 +0300, Denys Fedoryschenko wrote: > Hi > > Is it expected that: > 1)TX checksumming is off by default > 2)If i try to enable it over ethtool -K eth0 tx on , TCP sessions on proxy > getting stuck, even in tcpdump looks everything fine and packets reaching > destination, i don't understand what is a reason of failure. > Maybe if this feature supposed to not work - user must not be able just to > turn it on? It is broken for large swaths of the hardware -- I have patches that got it and TSO working on my hardware, and they provide a framework to see about getting it working on yours. Basically, the fields are in different places depending on the chip revision. I'll try to dig those out tonight and send them along so we can experiment.