Subject: Re: [PATCH] mac80211: add a function for setting the TIM bit for a
 specific station
From: Johannes Berg <johannes@sipsolutions.net>
To: Felix Fietkau <nbd@openwrt.org>
Cc: linux-wireless@vger.kernel.org, linville@tuxdriver.com
In-Reply-To: <4DAC0026.5020905@openwrt.org>
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	 <1303114525.3588.2.camel@jlt3.sipsolutions.net>
	 <4DAC0026.5020905@openwrt.org>
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Date: Mon, 18 Apr 2011 11:21:24 +0200
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On Mon, 2011-04-18 at 11:11 +0200, Felix Fietkau wrote:

> > The only question I have is how will PS-Poll be handled while an
> > aggregation session is active?? Is it even allowed to poll a-MPDUs?

> Not sure - polling A-MPDUs may not be allowed, the standard only 
> mentions polling MSDU and A-MSDU. We could add a driver callback later 
> that mac80211 calls upon receiving a PS-Poll when WLAN_STA_PS_DRIVER_BUF 
> is set, which will trigger the release of a single packet and indicate 
> in the return status whether it was the last one (from the driver's 
> point of view).

Yeah I just looked at it too -- seems not allowed, and I don't even see
a way to implement it. I suppose for any long-term sleep (rather than
for things like scanning) the aggregation sessions should just be torn
down.

johannes