netdev - Re: bond_compute_features() does not handle devices with different CSUM

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Date:	Wed, 30 May 2007 08:16:00 -0700
From:	"Laurent Chavey" <chavey@...gle.com>
To:	"Michael Buesch" <mb@...sch.de>
Cc:	netdev@...r.kernel.org
Subject: Re: bond_compute_features() does not handle devices with different CSUM

features = features & (dev_features & BOND_INTERSECT_FEATURES);

On 5/30/07, Michael Buesch <mb@...sch.de> wrote:
> On Wednesday 30 May 2007 04:47:09 Laurent Chavey wrote:
> > proposed change.
> >
> > --- 2.6.20/drivers/net/bonding/bond_main.c      2007-05-29
> > 19:43:39.010565000 -0700
> > +++ 2.6.20.fix/drivers/net/bonding/bond_main.c  2007-05-29
> > 19:46:12.376980000 -0700
> > @@ -1227,7 +1227,14 @@
> >         int i;
> >
> >         bond_for_each_slave(bond, slave, i) {
> > -               features &= (slave->dev->features & BOND_INTERSECT_FEATURES);
> > +               /* NETIF_F_HW_CSUM includes support for NET_IF_IP_CSUM
> > +                * as such when looking for the intersection we need to
> > +                * add it to the device supported features
> > +                */
> > +               unsigned long dev_features = slave->dev->features;
> > +               if (slave->dev->features & NETIF_F_HW_CSUM)
> > +                       dev_features |= NETIF_F_IP_CSUM;
>
>
> > +               features &= (features & BOND_INTERSECT_FEATURES);
>
> Is this statement correct?
> It's the same as
>         features = features & (features & BOND_INTERSECT_FEATURES);
> which looks strange to me.
> Did you mean something like
>         features |= (dev_features & BOND_INTERSECT_FEATURES);
> ?
>
> --
> Greetings Michael.
>
-
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