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

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Date:	Wed, 11 May 2011 16:11:21 -0700
From:	Mahesh Bandewar <maheshb@...gle.com>
To:	Michał Mirosław <mirqus@...il.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.

On Wed, May 11, 2011 at 12:15 PM, Michał Mirosław <mirqus@...il.com> wrote:
> 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.
>
This is not intrusive so should not create problems when that happens.

> [...]
>> --- 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.
>
set_features() can return the return code of set_loopback() instead of
0; this way the consistency will be maintained.

Thanks,
--mahesh..

> Best Regards,
> Michał Mirosław
>
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