From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758503AbZBKVsZ (ORCPT ); Wed, 11 Feb 2009 16:48:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755868AbZBKVsO (ORCPT ); Wed, 11 Feb 2009 16:48:14 -0500 Received: from xc.sipsolutions.net ([83.246.72.84]:49384 "EHLO sipsolutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755359AbZBKVsN (ORCPT ); Wed, 11 Feb 2009 16:48:13 -0500 Subject: RE: [PATCH]iwlan dma mapping read and write changes From: Johannes Berg To: "Winkler, Tomas" Cc: "Yu, Fenghua" , David Woodhouse , Ingo Molnar , Stephen Rothwell , "Grumbach, Emmanuel" , "Zhu, Yi" , Chris Wright , LKML , "iommu@lists.linux-foundation.org" In-Reply-To: <6F5C1D715B2DA5498A628E6B9C124F04F633E2D5@hasmsx504.ger.corp.intel.com> References: <20081001165606.GA21279@linux-os.sc.intel.com> <20090211182648.GA1661@linux-os.sc.intel.com> <6F5C1D715B2DA5498A628E6B9C124F04F633E2CD@hasmsx504.ger.corp.intel.com> <1234388027.16004.50.camel@johannes.local> <6F5C1D715B2DA5498A628E6B9C124F04F633E2D5@hasmsx504.ger.corp.intel.com> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-kWY3FhLxAHEgSuViB5so" Date: Wed, 11 Feb 2009 22:47:25 +0100 Message-Id: <1234388845.16004.53.camel@johannes.local> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-kWY3FhLxAHEgSuViB5so Content-Type: text/plain Content-Transfer-Encoding: quoted-printable > >> Indeed the firmware/ucode write back to host memory to update retry > >> counter for APMDU packets. I'm not sure if this is needed for legacy > >> traffic, though. > > > >I don't think they can be seeing AMPDU packets since that is, well, > >broken? >=20 > Currently I'm not aware of any other cases where memory is accessed > back but I may have not complete info. Will be back with the answer > tomorrow. I don't think it really matters, since AMPDU packets will be fixed soon, and for those you know it's necessary (and the report says that under some other circumstances it's also necessary). Unless there'd be some benefit from using BIDI only when we know it'll be needed, and using TODEV in the other cases? johannes --=-kWY3FhLxAHEgSuViB5so Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Comment: Johannes Berg (powerbook) iQIcBAABAgAGBQJJk0dqAAoJEKVg1VMiehFY7yYQAKq8CiVHcI87LdoQ02/98i4c kjsv/dCmWgJF1mWlpes2eh7ciNixUrluZq+56D9a4uduyi13ditUQ7ICu7Km9np2 sdyRNspC5KSe3bizpN5gzNQPnrZajDeSPrGjgM3CwxOtknORvXDssewXG7cRL8/H w633+LxC297Kz6/00VQ6jfsE4aFJzTvHflFwiWfhw5POKRX1ubqqLiYKFCCqhCED cA8rtoNKQ6hr1cyNEmHllobDzayk2w/W/r1SgIocrDO4GhIjh76CFkUG/NyeA4Y8 6W3MvL+v+rHMH76tFKOe1jbt5p4+IlpWT0zA4U6QOe4Go54aq2ByAu7AyboqJ03G yyn2v+nw81oyz0upt7BJ+GrCY/TmUCXdu/1qtcXTcgA5AsbgHNZDKGo8nwYYUV6C tJDZYoSmI3R/jOHl7sUZ8/jKETDaVRxte5dVojb6ss237PigN36q/APdZgX8g7xD lXKavGsXw6BnlEHlJ16YSyn1ekDra3MUaMyrMY5jQ4ijpwCwrPSsECQO2N7JoCr0 J8DcHWSyqsk3xqqut3sjbb4I/p+srgKaPxYGlEgneorVI7x2+1/XXSQi7NaaiaiH aNQeeqyXFQr9Hpz1A8XGI46x4ZmAkyUveiVKMb1Gb2+qH6Kg9Ti+gTUMXTBsHNFY sXiKpFMHjGFnNXjsTjFu =HYgZ -----END PGP SIGNATURE----- --=-kWY3FhLxAHEgSuViB5so--