netdev - Re: [PATCH 2/2] net: verify GSO flag bits against netdev features

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Date:	Thu, 17 Nov 2011 00:09:56 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
CC:	<netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 2/2] net: verify GSO flag bits against netdev features

On Thu, 2011-11-17 at 01:05 +0100, Michał Mirosław wrote:
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> ---
>  include/linux/netdevice.h |    9 +++++++++
>  1 files changed, 9 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index b35ffd7..31da3bb 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -2492,6 +2492,15 @@ netdev_features_t netif_skb_features(struct sk_buff *skb);
>  static inline int net_gso_ok(netdev_features_t features, int gso_type)
>  {
>  	netdev_features_t feature = gso_type << NETIF_F_GSO_SHIFT;
> +
> +	/* check flags correspondence */
> +	BUILD_BUG_ON(SKB_GSO_TCPV4   != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
> +	BUILD_BUG_ON(SKB_GSO_UDP     != (NETIF_F_UFO >> NETIF_F_GSO_SHIFT));
> +	BUILD_BUG_ON(SKB_GSO_DODGY   != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
> +	BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
> +	BUILD_BUG_ON(SKB_GSO_TCPV6   != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
> +	BUILD_BUG_ON(SKB_GSO_FCOE    != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));
> +
>  	return (features & feature) == feature;
>  }

This is fine but should still be done at the same time as changing the
definitions.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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