netdev - Re: [Bridge] Can linux kernel bridge forward 802.1q tagged vlan packets?

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Message-ID: <20130822151941.301cd36a@nehalam.linuxnetplumber.net>
Date:	Thu, 22 Aug 2013 15:19:41 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Marek Kierdelewicz <marek@...sta.pl>
Cc:	Stephan von Krawczynski <skraw@...net.com>,
	bridge@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [Bridge] Can linux kernel bridge forward 802.1q tagged vlan
 packets?

On Thu, 22 Aug 2013 23:49:41 +0200
Marek Kierdelewicz <marek@...sta.pl> wrote:

> Hi,
> 
> >My general idea is to bridge tagged vlan packets from a physical
> >interface (intel) to a virtual interface (virtio in qemu) and not
> >losing the tags, so the qemu guest can use vconfig and friends to get
> >some vlan interfaces. Is this possible and are there any additional
> >steps necessary besides the usual bridge configuration?
> 
> I'm using this setup with KVM virtualization (Qemu's successor). It
> didn't work with default nic type for guest (realtek I think) as 802.1q
> tags were not preserved properly in one of the directions. I don't
> remember specifics. Anyway using e1000 driver instead of default fixed
> it. Works like a charm.

KVM e1000 Vnic doesn't do VLAN offloading at least in my experience.
Virtio works fine.
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