netdev - Re: [RFC]: vlan priority handling in WMM

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Date:	Thu, 11 Jul 2013 18:17:10 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Cedric Debarge <cedric.debarge@...sys.fr>
CC:	<netdev@...r.kernel.org>, <linux-wireless@...r.kernel.org>
Subject: Re: [RFC]: vlan priority handling in WMM

On Thu, 2013-07-11 at 09:45 +0200, Cedric Debarge wrote:
> Dear mailing list,
> 
> I would like to manage the VLAN priority in Wireless QOS (WMM).
> 
> I get the VLAN tag from skb->vlan_tci and I extract the VLAN priority. 
> 
> How I should handle the priority value 0. 
> 	- Handle this value as no priority request, In this case the frame will 
> 		sent with the DSCP priority or default (Best effort)
>         - Handle this value as a lowest priority, in this case I Map it to the WMM.
[...]

IEEE 802.1q refers to the definition in 802.1d:

> The user_priority parameter is the priority requested by the
> originating service user. The value of this parameter is in the range
> 0 through 7.
> 
> NOTE—The default user_priority value is 0. Values 1 through 7 form an
> ordered sequence of user_priorities, with 1 being the lowest value and
> 7 the highest. See 7.7.3 and Annex G (informative) for further
> explanation of the use of user_priority values.

So a value of 0 should be treated as no priority request, same as for an
untagged frame.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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