Subject: Re: p54: AP mode: no data frame despite traffic indication set in
	TIM
From: Johannes Berg <johannes@sipsolutions.net>
To: Stefan Steuerwald <salsasepp@googlemail.com>
Cc: linux-wireless@vger.kernel.org, Chr <chunkeey@web.de>
In-Reply-To: <f76a32050811240536n4643d477jb49f8e18cb860820@mail.gmail.com> (sfid-20081124_143654_582633_D11529BD)
References: <f76a32050811210612i13ee251ewd6c1cab616a62529@mail.gmail.com>
	 <f76a32050811240536n4643d477jb49f8e18cb860820@mail.gmail.com>
	 (sfid-20081124_143654_582633_D11529BD)
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Date: Mon, 24 Nov 2008 14:41:08 +0100
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On Mon, 2008-11-24 at 14:36 +0100, Stefan Steuerwald wrote:

> I see "dropped TX filtered frame" messages in the syslog when at the
> same time I see wireless packet sequences as described below. Please
> see the attached logs.

Ah, very good, thank you.

> Nov 24 13:49:11 alix kernel: wlan0: STA 00:22:41:91:8e:96 aid 1 send
> PS frame since STA not sleeping anymore
> Nov 24 13:49:11 alix kernel: phy0: dropped TX filtered frame,
> queue_len=3D0 PS=3D0 @135594

That confirms my suspicion that something is going on with p54.
Christian, can you review the comment in net/mac80211/main.c around line
400, the one about races, wrt. p54?

> which may explain why I don't see any data packet on the air. Also
> attached is hostapd log.

Indeed.

> Another thing is the fact that we see 24(!) consecutive beacons with
> TIM bit set until the iPod finally wakes up. It seems to be lying to
> the AP, as it advertises a listen_interval of only 10. May this cause
> the above?

That is another issue, yes, but probably not causing it, we'd be seeing
"expired buffered frame" messages if it was, I think.

johannes

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