netdev - Re: [PATCH net-next] hv_netvsc: add ethtool support for set and get of settings

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Date:	Mon, 29 Feb 2016 22:34:38 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	David Miller <davem@...emloft.net>, sixiao@...rosoft.com
Cc:	kys@...rosoft.com, haiyangz@...rosoft.com,
	devel@...uxdriverproject.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] hv_netvsc: add ethtool support for set and get
 of settings

On Mon, 2016-02-29 at 17:09 -0500, David Miller wrote:
> From: Simon Xiao <sixiao@...rosoft.com>
> Date: Thu, 25 Feb 2016 15:24:08 -0800
> 
> > This patch allows the user to set and retrieve speed and duplex of the
> > hv_netvsc device via ethtool.
> > 
> > Example:
> > $ ethtool eth0
> > Settings for eth0:
> > ...
> >     Speed: Unknown!
> >     Duplex: Unknown! (255)
> > ...
> > $ ethtool -s eth0 speed 1000 duplex full
> > $ ethtool eth0
> > Settings for eth0:
> > ...
> >     Speed: 1000Mb/s
> >     Duplex: Full
> > ...
> > 
> > This is based on patches by Roopa Prabhu and Nikolay Aleksandrov.
> > 
> > Signed-off-by: Simon Xiao <sixiao@...rosoft.com>
> 
> Applied, thanks.

I missed this due to flu, but now I look at it - I don't see the point.
Link speed isn't meaingful for a memory-based transport, so "unknown"
is correct.  The link is effectively full duplex though.

If the issue is that ethtool is a bit shouty about unknowns, let's
consider changing that in ethtool, not teaching drivers to lie.

Ben.

-- 
Ben Hutchings
If God had intended Man to program,
we'd have been born with serial I/O ports.
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