Re: [BUG] bnx2 + vlan + TSO : doesnt work

Ben Hutchings
2011-01-18T00:09:28Z

On Tue, 2011-01-18 at 01:00 +0100, Eric Dumazet wrote:
> Le lundi 17 janvier 2011 à 23:47 +0000, Ben Hutchings a écrit :
> > On Tue, 2011-01-18 at 00:41 +0100, Eric Dumazet wrote:
> > > Oh well, my dev machine, with bnx2 and tg3 NICs, isnt working at all
> > > with current linux-2.6 tree (I need vlans on my setup)
> > >
> > > tg3 : vlan not working
> > >
> > > bnx2 : vlan + TSO not working (or very slowly, since only non GSO frames
> > > are OK)
> > >
> > > I suspect recent commits from Jesse are the problem.
> > > (bnx2_xmit() is feeded with zeroed vlan_tci skbs)
> > >
> > > Maybe f01a5236bd4b1401 (net offloading: Generalize
> > > netif_get_vlan_features().) ?
> > >
> > > I dont see NETIF_F_HW_VLAN_TX being set in vlan_features in net drivers.
> > > They only set this flag in dev->features
> > >
> > > I dont think changing all drivers to also set vlan_features makes sense.
> > >
> > > Is following patch the right path ? (It does solve my problem)
> >
> > This isn't right. NETIF_F_HW_VLAN_TX in vlan_features would mean that
> > the hardware can do two levels of VLAN tag insertion, which is generally
> > not true.
> >
>
> So should we revert part of Jesse patch ? I want my vlan back ;)

Yeah, that looks right.

Ben.

> diff --git a/net/core/dev.c b/net/core/dev.c
> index 54277df..8209d93 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -2076,7 +2076,7 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
> features = netif_skb_features(skb);
>
> if (vlan_tx_tag_present(skb) &&
> - !(features & NETIF_F_HW_VLAN_TX)) {
> + !(dev->features & NETIF_F_HW_VLAN_TX)) {
> skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
> if (unlikely(!skb))
> goto out;
>
>

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