On Wed, 2012-05-02 at 07:50 +0200, Frank Blaschka wrote:
> On Mon, Apr 30, 2012 at 07:51:33AM +0200, Eric Dumazet wrote:
> > On Mon, 2012-04-30 at 07:38 +0200, Frank Blaschka wrote:
> > > From: Frank Blaschka <frank.blaschka@xxxxxxxxxx>
> > >
> > > commit 8a83a00b0735190384a348156837918271034144 unconditionally
> > > drops dst reference when skb->dev is set. This causes a regression
> > > with VLAN and the qeth_l3 network driver. qeth_l3 can not get gw
> > > information from the skb coming from the vlan driver. It is only
> > > valid to drop the dst in case of different name spaces.
> > >
> > > Signed-off-by: Frank Blaschka <frank.blaschka@xxxxxxxxxx>
> > > ---
> > > net/core/dev.c | 2 +-
> > > 1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > --- a/net/core/dev.c
> > > +++ b/net/core/dev.c
> > > @@ -1881,8 +1881,8 @@ EXPORT_SYMBOL(netif_device_attach);
> > > #ifdef CONFIG_NET_NS
> > > void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
> > > {
> > > - skb_dst_drop(skb);
> > > if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
> > > + skb_dst_drop(skb);
> > > secpath_reset(skb);
> > > nf_reset(skb);
> > > skb_init_secmark(skb);
> > >
> >
> > You forgot CC Arnd Bergmann <arnd@xxxxxxxx> ?
> >
> > But we do want to do the skb_dst_drop() in dev_forward_skb()
> >
> > Your patch breaks dev_forward_skb() then.
> If NET_NS is not defined is this broken too?
> >
> > But apparently this forward path was alredy broken in Arnd patch...
> >
> Ok, until nobody comes up with an other idea I will post a patch to
> change back the vlan driver (use skb->dev = dev instead of skb_set_dev)
> next week.
> >
If Arnd doesnt care to even reply, we can just revert his buggy patch,
instead of trying to understand and fix all issues.
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