From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Hutchings Subject: Re: [PATCH v2] ethtool : Allow ethtool to set interface in loopback mode. Date: Fri, 03 Dec 2010 16:33:34 +0000 Message-ID: <1291394014.13384.7.camel@bwh-desktop> References: <1291299660.3259.5.camel@bwh-desktop> <20101203160333.GA235120@jupiter.n2.diac24.net> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: Mahesh Bandewar , linux-netdev , Tom Herbert , David Miller To: David Lamparter Return-path: Received: from exchange.solarflare.com ([216.237.3.220]:2865 "EHLO exchange.solarflare.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751620Ab0LCQdh (ORCPT ); Fri, 3 Dec 2010 11:33:37 -0500 In-Reply-To: <20101203160333.GA235120@jupiter.n2.diac24.net> Sender: netdev-owner@vger.kernel.org List-ID: On Fri, 2010-12-03 at 17:03 +0100, David Lamparter wrote: > On Thu, Dec 02, 2010 at 02:35:51PM -0800, Mahesh Bandewar wrote: > > This patch adds -L command-line option to switch loopback mode on/off > > and -l option to display current loopback mode on a specified interface. > [...] > > +.A1 on off > > +Switches loopback mode > > +.B on > > +or > > +.B off > > What about devices that support different kinds of loopback, like MAC > loopback & PHY loopback? (No idea if we have kernel support for this > either...) That distinction is useful for diagnostic purposes, but drivers can already cover those different loopback modes in self-test. The motivation for this feature is testing data path behaviour, and Mahesh has specified that loopback should be enabled as near as possible to the host. Ben. -- Ben Hutchings, Senior Software Engineer, Solarflare Communications Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked.