linux-kernel - Re: [PATCH] tg3: fix VLAN tagging regression

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Date:	Wed, 21 Sep 2011 00:08:53 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Kasper Pedersen <kernel@...perkp.dk>
Cc:	Jesse Gross <jesse@...ira.com>,
	Matt Carlson <mcarlson@...adcom.com>,
	Michael Chan <mchan@...adcom.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tg3: fix VLAN tagging regression

Le mardi 20 septembre 2011 à 23:57 +0200, Kasper Pedersen a écrit :
> On 09/20/2011 11:27 PM, Jesse Gross wrote:
> 
> > On Tue, Sep 20, 2011 at 2:09 PM, Matt Carlson <mcarlson@...adcom.com> wrote:
> >> On Tue, Sep 20, 2011 at 01:48:56PM -0700, Kasper Pedersen wrote:
> >>> commit 92cd3a17ce9c719abb4c28dee3438e0c641f8de4
> >>>     tg3: Simplify tx bd assignments
> >>>
> >>> broke VLAN tagging on outbound packets.
> >>> It ifdef'ed BCM_KERNEL_SUPPORTS_8021Q, but this
> >>> is not set anywhere. So vlan never gets set, and
> >>> all packets are sent with vlan=0.
> >>>
> >>> Change to use the CONFIG_VLAN_xxx defines instead.
> >>> Tested on BCM5721 rev 11.
> >>>
> >>> Signed-off-by: Kasper Pedersen <kernel@...perkp.dk>
> >>
> >> Yes.  This is correct.
> >>
> >> Acked-by: Matt Carlson <mcarlson@...adcom.com>
> > 
> > Actually, please don't do this.  Those config #define's refer to the
> > 802.1q module that creates vlan devices only.  The rest of the network
> > stack has code for dealing with vlan packets that is not protected by
> > config guards, so there's no reason that drivers should be.  The
> > correct thing to do here is just drop the test altogether and
> > unconditionally include the code.
> > 
> 
> 
> currently testing, and will post a just-remove-ifdef in a few hours,
> assuming it behaves as expected on a no-802.1q-module config.
> 
> 
> tg3 has one more place where this is done, and it looks as if the code
> in that location doesn't quite mesh with the comment.

Thanks for finding this bug, this hit me last day on a BCM5755M but I
had no time to investigate.


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