netdev - Re: vlan 03/07: Add ethtool support

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Date:	Mon, 7 Jul 2008 17:52:18 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: vlan 03/07: Add ethtool support

Patrick McHardy wrote:
> vlan: Add ethtool support
> 
> Add ethtool support for querying the device for offload settings.
> 
> Signed-off-by: Patrick McHardy <kaber@...sh.net>
[...]
> +static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
> +{
> +	const struct vlan_dev_info *vlan = vlan_dev_info(dev);
> +	struct net_device *real_dev = vlan->real_dev;
> +
> +	if (real_dev->ethtool_ops == NULL ||
> +	    real_dev->ethtool_ops->get_rx_csum == NULL)
> +		return 0;
> +	return real_dev->ethtool_ops->get_rx_csum(real_dev);

But we don't know whether RX checksum offload applies to VLAN-tagged
packets (or, admittedly, any specific protocol).  It would be nice if there
was a feature flag for this so it could be advertised in vlan_features.

> +}
> +
> +static const struct ethtool_ops vlan_ethtool_ops = {
> +	.get_link		= ethtool_op_get_link,
> +	.get_rx_csum		= vlan_ethtool_get_rx_csum,

Can't we also add:

	.get_tx_csum		= ethtool_op_get_tx_csum,
	.get_sg			= ethtool_op_get_sg,
	.get_tso		= ethtool_op_get_tso,
	.get_flags		= ethtool_op_get_flags,

?

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
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