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

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Message-ID: <56B1C608.1040805@cumulusnetworks.com>
Date:	Wed, 3 Feb 2016 10:19:04 +0100
From:	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:	Nikolay Aleksandrov <razor@...ckwall.org>, netdev@...r.kernel.org
Cc:	mst@...hat.com, 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 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