netdev - Re: [PATCH v2] ethtool : Allow ethtool to set interface in loopback mode.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1291394014.13384.7.camel@bwh-desktop>
Date:	Fri, 03 Dec 2010 16:33:34 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Lamparter <equinox@...c24.net>
Cc:	Mahesh Bandewar <maheshb@...gle.com>,
	linux-netdev <netdev@...r.kernel.org>,
	Tom Herbert <therbert@...gle.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH v2] ethtool : Allow ethtool to set interface in
 loopback mode.

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.

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html