netdev - Re: [PATCH net-next v5 2/2] virtio_net: add ethtool support for set and get of settings

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Date:	Thu, 4 Feb 2016 14:23:14 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Cc:	Nikolay Aleksandrov <razor@...ckwall.org>, netdev@...r.kernel.org,
	roopa@...ulusnetworks.com, davem@...emloft.net
Subject: Re: [PATCH net-next v5 2/2] virtio_net: add ethtool support for set
 and get of settings

On Wed, Feb 03, 2016 at 10:19:04AM +0100, Nikolay Aleksandrov wrote:
> On 02/03/2016 04:04 AM, Nikolay Aleksandrov wrote:
> > From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
> > 
> > This patch allows the user to set and retrieve speed and duplex of the
> > virtio_net device via ethtool. Having this functionality is very helpful
> > for simulating different environments and also enables the virtio_net
> > device to participate in operations where proper speed and duplex are
> > required (e.g. currently bonding lacp mode requires full duplex). Custom
> > speed and duplex are not allowed, the user-supplied settings are validated
> > before applying.
> > 
> > Example:
> > $ ethtool eth1
> > Settings for eth1:
> > ...
> > 	Speed: Unknown!
> > 	Duplex: Unknown! (255)
> > $ ethtool -s eth1 speed 1000 duplex full
> > $ ethtool eth1
> > Settings for eth1:
> > ...
> > 	Speed: 1000Mb/s
> > 	Duplex: Full
> > 
> > Based on a patch by Roopa Prabhu.
> > 
> > Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
> > ---
> > v2: use the new ethtool speed/duplex validation functions and allow half
> > duplex to be set
> > v3: return error if the user tries to change anything besides speed/duplex
> > as per Michael's comment
> > We have to zero-out advertising as it gets set automatically by ethtool if
> > setting speed and duplex together.
> > v4: Set port type to PORT_OTHER
> > v5: null diff1.port because we set cmd->port now and ethtool returns it in
> > the set request, retested all cases
> > 
> 
> Hmm, nulling the advertising and ->port completely ignores them, i.e. won't produce
> an error if the user actually specified a different value for either of them.
> We can check if the ->port matches what we returned, but there's no fix for
> advertising. I'm leaving both ignored for now, please let me know if you'd
> prefer otherwise.
> 
> Thanks,
>  Nik

I think I prefer validating port.
For advertising we don't allow enabling autonegotiation so ignoring
these is fine I think.

-- 
MST