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

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Message-ID: <4E790C5E.5000000@kasperkp.dk>
Date:	Tue, 20 Sep 2011 23:57:50 +0200
From:	Kasper Pedersen <kernel@...perkp.dk>
To:	Jesse Gross <jesse@...ira.com>
CC:	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

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.

/Kasper Pedersen
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