On Thu, May 12, 2011 at 05:29:07PM +0100, Ben Hutchings wrote:
> On Thu, 2011-05-12 at 18:06 +0200, Michał Mirosław wrote:
> > This implements checks for forwarding mode in netdev_fix_features() using
> > dev->priv_flags bits. As a side effect, after device is no longer
> > forwarding it gets LRO back. This also means that user is not allowed to
> > enable LRO after device is put to forwarding mode.
> >
> > This patch depends on removal of discrete offload setting ethtool ops.
>
> This is nice, but:
>
> [...]
> > --- a/net/bridge/br_if.c
> > +++ b/net/bridge/br_if.c
> > @@ -158,6 +158,8 @@ static void del_nbp(struct net_bridge_port *p)
> > br_netpoll_disable(p);
> >
> > call_rcu(&p->rcu, destroy_nbp_rcu);
> > +
> > + netdev_update_features(dev);
> > }
> >
> > /* called with RTNL */
> > @@ -368,11 +370,9 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
> >
> > dev->priv_flags |= IFF_BRIDGE_PORT;
> >
> > - dev_disable_lro(dev);
> > -
> > list_add_rcu(&p->list, &br->port_list);
> >
> > - netdev_update_features(br->dev);
> > + netdev_change_features(dev);
> >
> > spin_lock_bh(&br->lock);
> > changed_addr = br_stp_recalculate_bridge_id(br);
> Why netdev_change_features() here? I thought that was primarily for use
> when vlan_features may have been changed.
Because this recalculates port's features and then cascades to bridge's
device. I could have written:
netdev_update_features(dev);
netdev_update_features(br->dev);
But that might cause redundant recalculations for br->dev (first through
notifier calls). I'll add a comment here.
>
> [...]
> > --- a/net/core/dev.c
> > +++ b/net/core/dev.c
> [...]
> > @@ -5241,6 +5221,11 @@ u32 netdev_fix_features(struct net_device *dev, u32 features)
> > }
> > }
> >
> > + if (features & NETIF_F_LRO && dev->priv_flags & IFF_LRO_FORBIDDEN) {
> > + netdev_info(dev, "Disabling LRO for forwarding interface.\n");
> > + features &= NETIF_F_LRO;
> [...]
>
> Mising '~'.
Fixed.
Best Regards,
Michał Mirosław
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