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List:       linux-vlan
Subject:    RE: [VLAN] 8139cp.c and VLAN Hardware Acceleration
From:       "Simon Talbot" <simont () nse ! co ! uk>
Date:       2003-08-18 11:38:42
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Ahhh, could well be the case -- should bean that if you use the original
cose, and choose a VLAN ID of something like 257 (0x0101) it should work
with the buggy version of the code.

I will apply your patch and re-enable hardware acceleration and see what
happens, will post to the list my findings when done (this is in service
in a large scale MPLS system so applying the patch and checking is kindo
of tricky !

Will keep you posted, thanks very much,

Simon

Simon Talbot MEng, ACGI
(Chief Engineer)
Net Solutions Europe Limited
Tel: 01206 216400
Fax: 01206 216420

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-----Original Message-----
From: Matthew Natalier [mailto:matthewn@snapgear.com] 
Sent: 18 August 2003 06:45
To: Linux 802.1Q VLAN
Subject: Re: [VLAN] 8139cp.c and VLAN Hardware Acceleration


Hi Simon,

On Thu, 2003-07-03 at 08:07, Simon Talbot wrote:
> I have some strange VLAN issues with the 8139c+ Ethernet chip and some

> VLANs I am experimenting with which hopefully someone can help shed 
> some light on.
> 
I have just been playing with this and encountered the exact same
problem.

I appears as though the C+ driver copies the vlan tag with the wrong
byte order.  If I do a packet dump I get the following packet extracts:

81 00 07 f2

You can see the ethertype and then the vlan id field.  This is for a
vlan of 2034 (created using 'vconfig add eth0 2034').

This is with the hardware C+ vlan support:

81 00 f2 07

Once again created with 'vconfig add eth0 2034'.

Find attached a simple patch against 2.4.21 which fixes the byte
ordering problem.

Interestingly enough, I have a couple of HP 2626 switches here and they
seem to want the vlan_id to have the incorrect byte ordering.  Has
anybody else encountered this?  I have yet to ask HP about what is going
on here.

Cheers

Matt

-- 
Matthew Natalier, Systems Programmer, SnapGear, Inc.
Ph: +61 7 3435 2805, Fx: +61 7 3891 3630
Email: matthewn@snapgear.com, Web: http://www.SnapGear.com


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