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

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Message-ID: <20111117001312.GB9596@rere.qmqm.pl>
Date:	Thu, 17 Nov 2011 01:13:12 +0100
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	Ben Hutchings <bhutchings@...arflare.com>
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, Nov 17, 2011 at 12:09:56AM +0000, Ben Hutchings wrote:
> 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.

Agreed. But as Dave was quicker, we need to fix this in separate patch.

Best Regards,
Michał Mirosław
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