netdev - Re: [PATCH 1/1] add ethtool loopback support

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Date:	Thu, 08 Apr 2010 20:35:56 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Laurent Chavey <chavey@...gle.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, therbert@...gle.com
Subject: Re: [PATCH 1/1] add ethtool loopback support

On Thu, 2010-04-08 at 12:17 -0700, Laurent Chavey wrote:
> On Thu, Apr 8, 2010 at 11:29 AM, Ben Hutchings
> <bhutchings@...arflare.com> wrote:
> > On Thu, 2010-04-08 at 10:35 -0700, chavey@...gle.com wrote:
[...]
> >> +enum ethtool_loopback_type {
> >> +     ETH_MAC                 = 0x00000001,
> >> +     ETH_PHY_INT             = 0x00000002,
> >> +     ETH_PHY_EXT             = 0x00000004
> >> +};
> > [...]
> >
> > There are many different places you can loop back within a MAC or PHY,
> > not to mention bypassing the MAC altogether.  See
> > drivers/net/sfc/mcdi_pcol.h, starting from the line
> > '#define MC_CMD_LOOPBACK_NONE 0'.  I believe we implement all of those
> > loopback modes on at least one board.
> >
> > Also are these supposed to be an enumeration or flags?  In theory you
> those are enums that can be or together.

I.e. they are flags.  So how do you answer this:

> > could use wire-side and host-side loopback at the same time if they
> > don't overlap, but it's probably too much trouble to bother with.  Any
> > other combination is meaningless.

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.

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