netdev - Re: Problem with VLANs and via-velocity driver

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Date:	Fri, 13 Nov 2009 11:36:49 +0100
From:	Séguier Régis <rseguier@...eleport.net>
To:	Kevin Shanahan <kmshanah@...enchant.net>
CC:	netdev@...r.kernel.org
Subject: Re: Problem with VLANs and via-velocity driver

Patrick McHardy a écrit :
> Kevin Shanahan wrote:
>   
>> Hi,
>>
>> I've had some problems with getting a fairly simple (I thought) VLAN
>> configuration working with the on board Via NICs on my Via M700
>> board. Looks like as soon as a tagged VLAN interface is added, the
>> underlying "raw" (untagged) interface stops responding.
>>
>> ...
>>
>> A bit of searching found a few references to similar problems going
>> back a few years (2005, 2007). Sounded like there were some driver
>> issues, but it wasn't clear from the messages I found whether they
>> were believed to be fixed or not. I tried the same test using a
>> differnt NIC with the tg3 driver and there were no problems, so it
>> looks to me like it's still a via-velocity issue. Unfortunately I
>> don't have room to add NICs to this machine and need to use the on
>> board Via hardware.
>>     
>
> There's some special-casing for VID 0 in velocity_init_cam_filter().
> Does "ip link add link eth0 type vlan id 0" make any difference?
> If not, does "ip link set eth0 promisc on"?
>   
When we patch the driver to support multiple vlan, we decide to use the 
vlan 0 to desactivate the vlan filtering.

via-velocity: fix vlan receipt

- vlans were using a single CAM register (see mac_set_vlan_cam)
- setting the address filtering registers for vlans is not
  needed when there is no vlan

The non-tagged interface is filtered out as soon as a tagged
(!= 0) interface is created. Its traffic appears again when an
zero-tagged interface is created.

Tested on Via Epia SN (VT6130 chipset) with several vlans whose
tag was above or beyond 255.

Signed-off-by: Séguier Régis <rseguier@...eleport.net>
Acked-by: Francois Romieu <romieu@...zoreil.com>
Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
-- 
Régis Séguier
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