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

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Message-ID: <AANLkTincFt4fKLvtity=MgQ2+cuvNFrBHqu3+bMLsypc@mail.gmail.com>
Date:	Mon, 17 Jan 2011 16:13:18 -0800
From:	Jesse Gross <jesse@...ira.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [BUG] bnx2 + vlan + TSO : doesnt work

On Mon, Jan 17, 2011 at 4:09 PM, Ben Hutchings
<bhutchings@...arflare.com> wrote:
> 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.

I think it is better for netif_skb_features() to actually return the
correct features rather than bypass it here.  NETIF_F_HW_VLAN_TX
doesn't depend on any other offloads, so we can always include it if
it is in dev->features.

Separately, this means there is a problem with bnx2 because it allows
vlan insertion to be turned off, which would have the same effect.
Maybe it is looking directly at skb->protocol or similar for TSO.
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