netdev - Re: [PATCHv1] e1000e: Allow ethtool to enable/disable loopback.

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Date:	Wed, 11 May 2011 21:15:49 +0200
From:	Michał Mirosław <mirqus@...il.com>
To:	Mahesh Bandewar <maheshb@...gle.com>
Cc:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	e1000-devel <e1000-devel@...ts.sourceforge.net>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Tom Herbert <therbert@...gle.com>
Subject: Re: [PATCHv1] e1000e: Allow ethtool to enable/disable loopback.

2011/5/11 Mahesh Bandewar <maheshb@...gle.com>:
> This patch adds e1000_set_features() to handle loopback mode. When loopback
> is enabled, it enables internal-MAC loopback.

Please wait for this driver's conversion to hw_features. One comment
below, though.

[...]
> --- a/drivers/net/e1000e/netdev.c
> +++ b/drivers/net/e1000e/netdev.c
[...]
> +static int e1000_set_features(struct net_device *dev, u32 features)
> +{
> +       u32 changed = dev->features ^ features;
> +
> +       if ((changed & NETIF_F_LOOPBACK) && netif_running(dev))
> +               e1000_set_loopback(dev, features);
> +
> +       return 0;
> +}
[...]

If e1000_set_loopback() fails, this should set dev->features to passed
features (but keeping NETIF_F_LOOPBACK unchanged in dev->features) to
keep the state consistent.

Best Regards,
Michał Mirosław
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