Subject: Re: [PATCH v3 1/1] mac80211: tell driver when dtim change detected
From: Johannes Berg <johannes@sipsolutions.net>
To: Jouni Malinen <j@w1.fi>
Cc: "Luis R. Rodriguez" <mcgrof@gmail.com>, wey-yi.w.guy@intel.com,
	linux-wireless@vger.kernel.org, Kalle Valo <kalle.valo@nokia.com>
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Date: Mon, 25 Jan 2010 19:38:47 +0100
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On Mon, 2010-01-25 at 19:36 +0100, Johannes Berg wrote:
> On Mon, 2010-01-25 at 10:32 -0800, Jouni Malinen wrote:
>=20
> > Anyway, that is just asking for
> > problems due to the way a specific timestamps are defined to be used fo=
r
> > the beacons that are followed by buffered multicast/broadcast frames.
>=20
> That's actually an interesting point -- does anyone implement that
> properly, or is that just a side note in the standard nobody even reads?
> We certainly don't in mac80211 since we don't have that level of
> synchronisation between the TSF and the beacon get function.

And, in fact, the DTIM count is kinda useless if one was to rely on that
timing requirement, so I have a feeling that the intention of the people
who wrote this bit of the standard wasn't to actually impose such a
requirement.

johannes

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