Return-path: Received: from xc.sipsolutions.net ([83.246.72.84]:59980 "EHLO sipsolutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752066AbYKXNiI (ORCPT ); Mon, 24 Nov 2008 08:38:08 -0500 Subject: Re: p54: AP mode: no data frame despite traffic indication set in TIM From: Johannes Berg To: Stefan Steuerwald Cc: linux-wireless@vger.kernel.org, Chr In-Reply-To: (sfid-20081121_151226_825613_6BD7F761) References: (sfid-20081121_151226_825613_6BD7F761) Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-ir55+/dpiGxh1LK5ImRy" Date: Mon, 24 Nov 2008 14:37:54 +0100 Message-Id: <1227533874.2927.2.camel@johannes.berg> (sfid-20081124_143812_530218_CA2F202E) Mime-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: --=-ir55+/dpiGxh1LK5ImRy Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Fri, 2008-11-21 at 15:12 +0100, Stefan Steuerwald wrote: > - frame 7: http request > - frame 13: iPod goes to sleep > - frame 23: AP beacon indicates traffic for iPod (AID 1 in TIM) in 24 too, the ipod probably didn't see the beacon in frame 23 even though 23 was a dtim beacon (which is a bit odd, but maybe the ipod doesn't care about mcast at this point) > - frame 25: iPod wakes up 26: ack from the AP > - in between: MISSING DATA ??? > - frame 27: AP beacon with no traffic indicated ??? > - frame 29: iPod goes to sleep again > - subsequent frames: repetitions of this, until the TCP connection is clo= sed >=20 > My understanding is that the AP would not indicate any traffic without > actually having some ready to send? Wrong assumption? Indeed. Christian, is it possible that the p54 device is actually filtering these frames? I'm pretty sure mac80211 behaves correctly, and it unsetting the TIM bit means that it must no longer have traffic buffered. johannes --=-ir55+/dpiGxh1LK5ImRy Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Comment: Johannes Berg (powerbook) iQIcBAABAgAGBQJJKq4tAAoJEKVg1VMiehFYXycQAI0yOzAtBQ6wddQdAUwnF96F ZESWVu20YKdNNjPUjwK+v9GyW8DWvflP96DT3KKH8LscqMQCTxkFcYkgnfL4nsAb 2qJbCw6A/01Y41RoJ+DIYsL4TKyQV+FFy4kITGPa+/Qe07QsKbuGVbCldcBiSoTI FTQj8jK9q7KO2tC4s9rl15AJ1PZ+uWDZUficxFpSE+7DtmCYNTr7vubrDLbkP4lq +0wNmjtA603g3XgrU42Tp8Q9tJkzo81SrDfBor4zq74ks2ENDJ0cCp2tAnhlNe5p 6X3okDGiMgv1LReqBXj/6+D/Q6VOZ1ZN83HMPqHm3gxC41RYuvlFaSzhKpwEvFU/ t8dKj6LJ2qT1GWfcLZ3roz+flIWtJ/MLQbxMOl4IIlwXuA1ySpyf7GT8o/zZIbQZ DxFGhPhcb2z+QCX6c+lKLINu1lpYdaSbs38CtuqO32wqnpVuyBLOQ96HUS2vfp4l TWKiE4nLJQGQYCY2SuQVKfBMWnPcDyBiRQgvxDl2KBaaOgSm6YOBHTdDq7/ts9QU X7D4N9Cjyf4frowzmm80H7jLZcbDeFGcFCKzuyBkcybpLGLSGW6jepdG+z5ZKana uwMmzeSXibeDPN89ye70cQn0SzbJmViyM7clqmtdM3xZq6hYWBx7KNgAoAHQX9pH hFYpeSbKDTXUwQLanZU+ =qFIs -----END PGP SIGNATURE----- --=-ir55+/dpiGxh1LK5ImRy--