Re: [PATCH] nl80211: allow ad-hoc to set WMM parameters from outside

[Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de>]

[-- Attachment #1: Type: text/plain, Size: 1717 bytes --]

Hello Christian,

On Wed, Jan 09, 2013 at 03:10:49PM +0100, Christian Lamparter wrote:
> On Wednesday, January 09, 2013 02:15:40 PM Simon Wunderlich wrote:
> > On Tue, Jan 08, 2013 at 09:28:44AM -0800, Adrian Chadd wrote:
> > > I still populate the WME fields; I need to "fix" paying attention to
> > > them in the adhoc case.
> > 
> > Applying the EDCA parameters in the hardware and sending "standard" WME IEs
> > (without EDCA parameter sets) is understandable, Linux does that too. 
> 
> Well, the WFA WMM Specification v1.2 costs $99 (last time I checked, which wasn't
> too long ago). However Johannes told me that the WMM IE should not be added
> to IBSS beacons.

I don't have the spec, and I don't intend to buy it. :)

But: We do have WMM IE sent by Linux IBSS STAs even today. The difference to the AP
WMM IEs is that it doesn't include EDCA parameters (cwmin/max, aifs, ...). But still,
this is useful to detect that the other IBBS station is WMM-capable: we can then
use QOS_DATA frames, use noack, etc ...
> 
> However, we can still pack some EDCA parameters into beacons, probe/(re-)assoc
> resps because there's an alternative IE. The "EDCA Parameter Set IE" is part of
> 802.11-2012 8.4.2.31 - The Element ID is 12 [Table 8-54].

Ah didn't know that - thanks for pointing that out. Although I'm still in favor of
not sending anything in IBSS and do local changes only. :)
> 
> [Note: It's worth mentioning that the WFA WMM spec was just a stop-gap measure
> until 802.11e was ready. Here's an article which explains this weird bit of
> history, unfortunately it is in German
> <http://www.heise.de/netze/artikel/Parallelnorm-WMM-223736.html>]
> 
> Regards,
> 	Chr

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 198 bytes --]