Date: Wed, 9 Jan 2013 15:33:04 +0100
From: Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de>
To: Christian Lamparter <chunkeey@googlemail.com>
Cc: Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de>,
	Adrian Chadd <adrian@freebsd.org>,
	Johannes Berg <johannes@sipsolutions.net>,
	linux-wireless@vger.kernel.org, linville@tuxdriver.com,
	mathias.kretschmer@fokus.fraunhofer.de,
	Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Subject: Re: [PATCH] nl80211: allow ad-hoc to set WMM parameters from
 outside
Message-ID: <20130109143304.GA23469@pandem0nium> (sfid-20130109_153319_972408_43D83857)
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 <20130109131540.GA22836@pandem0nium>
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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.
> >=20
> > Applying the EDCA parameters in the hardware and sending "standard" WME=
 IEs
> > (without EDCA parameter sets) is understandable, Linux does that too.=
=20
>=20
> Well, the WFA WMM Specification v1.2 costs $99 (last time I checked, whic=
h wasn't
> too long ago). However Johannes told me that the WMM IE should not be add=
ed
> 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 t=
o 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 ...
>=20
> 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 p=
art 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 f=
avor of
not sending anything in IBSS and do local changes only. :)
>=20
> [Note: It's worth mentioning that the WFA WMM spec was just a stop-gap me=
asure
> 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>]
>=20
> Regards,
> 	Chr

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