From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758334AbZBKVvJ (ORCPT ); Wed, 11 Feb 2009 16:51:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758562AbZBKVuv (ORCPT ); Wed, 11 Feb 2009 16:50:51 -0500 Received: from xc.sipsolutions.net ([83.246.72.84]:49478 "EHLO sipsolutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754820AbZBKVuu (ORCPT ); Wed, 11 Feb 2009 16:50:50 -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: <1234388845.16004.53.camel@johannes.local> 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> <1234388845.16004.53.camel@johannes.local> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-QJDoUAqAZmwieoIxO/hj" Date: Wed, 11 Feb 2009 22:50:07 +0100 Message-Id: <1234389007.16004.55.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 --=-QJDoUAqAZmwieoIxO/hj Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Wed, 2009-02-11 at 22:47 +0100, Johannes Berg wrote: > > >> 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. >=20 > 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? Or if there's a firmware bug. johannes --=-QJDoUAqAZmwieoIxO/hj Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Comment: Johannes Berg (powerbook) iQIcBAABAgAGBQJJk0gKAAoJEKVg1VMiehFYHzkQAI4TEGOISIDni20gm6Ca9oEE 2zqkUUI3rszUbh76rVCmGPmbSQCfvEI1fGr2sqszMqdcDeiPSvudxuSiMc7Dpt0G I5ziz6gAL61ry1Do+qi3Ny3x+qs2eAcGDxx8Ua97NQvXrpuXx9ApH4ytvaFvu541 sbogJ9e46NwwLBOVyH3HgLHazX76uNQrunU6BdE+Z6qUS6XB9w36UNM/N2VTnVgb rZj3q5oQ/xcElQXvw4fybXXZSGS+49qeUeQyJ1JEnoOPpHiOtUowu7RRnhqBtsmA Bq1+FvEMvRGJVlrFHDVdKmrRCcl4qzglbW1iVoTIVHLpXWpDaKst31naf7f3w4ZO fWPaMzqIV9kSwk/kPKeq1scxn5uXJC8A5yNlMljBbyGc5Zcpul8dFa4tqrFbTyai wGG7d/g/TBZFZeJ9VVPHPbhf5vyNFyeZeTpSgOkslovx6uGZXUwQT5GhxPNaecas gE2M9P6VLxEYWHjK2b0jgWDtv0Khp7WIwPul+pd88omARHf0YfwpbyMsSZcpJmYK QTKBLICBAH/Y9bilBpcMndyAFT14NuJZgZQZTq5hNNUQHLHGlS5RKgSdJFDL1TES TpMorbeXQyKCWQqmb3KgD5i/aUI3YfR+8LViTCBTiyTmNkSMo5RD0+yokGDeJN5s mfyJ6FCP9YSJ9UvSJopf =mlG3 -----END PGP SIGNATURE----- --=-QJDoUAqAZmwieoIxO/hj--