netdev - Re: [PATCH 09/12] tile: support TSO for IPv6 in tilegx network driver

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Message-Id: <20130731.122534.774117327230299927.davem@redhat.com>
Date:	Wed, 31 Jul 2013 12:25:34 -0700 (PDT)
From:	David Miller <davem@...hat.com>
To:	cmetcalf@...era.com
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 09/12] tile: support TSO for IPv6 in tilegx network
 driver

From: Chris Metcalf <cmetcalf@...era.com>
Date: Wed, 31 Jul 2013 11:05:04 -0400

> @@ -1950,6 +1963,7 @@ static void tile_net_setup(struct net_device *dev)
>  	dev->features |= NETIF_F_HW_CSUM;
>  	dev->features |= NETIF_F_SG;
>  	dev->features |= NETIF_F_TSO;
> +	dev->features |= NETIF_F_TSO6;
>  	dev->mtu = 1500;

This driver is severely out of date wrt. how to properly advertise
device features, and you really need to fix this _before_ adding
support for new capabilities.

dev->hw_features specifies what the device is capable of, whereas
dev->features specifies what features are currently enabled.

Using these two values we determine what feature bits the user
can configure on and off using generic code which checks
dev->hw_features when the user makes a request.

You'll also want to have a look at netdev_ops->ndo_fix_features
and netdev_ops->ndo_set_features which allow a driver to handle
attempts to install illegal combinations of features.

You can look at other well maintained drivers to see how this
works.

Thanks.
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