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

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Date:	Tue, 18 Jan 2011 00:09:25 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, Jesse Gross <jesse@...ira.com>
Subject: Re: [BUG] bnx2 + vlan + TSO : doesnt work

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.

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