netdev - Re: capturing vlan on 2.6.18

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Date:	Tue, 4 Mar 2008 13:09:11 +0100
From:	Pavel Krauz <krauz@...z.cz>
To:	Pekka Pietikainen <pp@...oulu.fi>
Cc:	netdev@...r.kernel.org
Subject: Re: capturing vlan on 2.6.18

> On Tuesday 04 March 2008 12:18, Pekka Pietikainen wrote:
> On Thu, Feb 28, 2008 at 12:26:08PM +0100, Pavel Krauz wrote:
> > >> Is this a kernel bug or am I supposed to set something?
> > > It's an unfortunate side effect of hardware VLAN acceleration. It
> > > can't be turned off (apart from patching the driver to not advertise
> > > VLAN acceleration support).
> > I think that enabling VLAN tags shall be at least kernel run-time or boot time
> >  configurable option.
> Oh, the no VLAN tags with bnx2 is a slightly different matter,
> I've used the patch
> 
> #ifdef BCM_VLAN
>         if (!bp->vlgrp && !(bp->flags & ASF_ENABLE_FLAG))
>                 rx_mode |= BNX2_EMAC_RX_MODE_KEEP_VLAN_TAG;
> #else

Thanks,
I have found out that by disabling the ASF/management firmware through Broadcom 
diagnostic utility I get VLAN tags in the packets. I think that it shall be at least documented
in the driver/help. I have no idea for what the ASF is used for in linux.
There shall be a tool or option how to disable it from user space or at boot time or in driver.

Pavel


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