netdev - Re: [PATCHv3 2/2] tg3: Allow ethtool to enable/disable loopback.

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Date:	Wed, 4 May 2011 13:11:12 +0200
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	Mahesh Bandewar <maheshb@...gle.com>
Cc:	Matt Carlson <mcarlson@...adcom.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Michael Chan <mchan@...adcom.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Tom Herbert <therbert@...gle.com>
Subject: Re: [PATCHv3 2/2] tg3: Allow ethtool to enable/disable loopback.

On Tue, May 03, 2011 at 06:18:55PM -0700, Mahesh Bandewar wrote:
> This patch adds tg3_set_features() to handle loopback mode. Currently the
> capability is added for the devices which support internal MAC loopback mode.
> So when enabled, it enables internal-MAC loopback.
[...]
> diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
> index 7c7c9a8..46de633 100644
> --- a/drivers/net/tg3.c
> +++ b/drivers/net/tg3.c
> @@ -6319,6 +6319,51 @@ static u32 tg3_fix_features(struct net_device *dev, u32 features)
>  	return features;
>  }
>  
> +static int tg3_set_features(struct net_device *dev, u32 features)
> +{
> +	struct tg3 *tp = netdev_priv(dev);
> +	u32 cur_mode = 0;
> +	int err = 0;
> +
> +	if (!netif_running(dev)) {
> +		err = -EAGAIN;
> +		goto sfeatures_out;
> +	}

netdev_update_features() is not designed to handle -EAGAIN from
ndo_set_features callback. It might be useful to implement this
handling, but in this case you should just return 0 and check
dev->features in ndo_open callback.

Best Regards,
Michał Mirosław
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