Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750769AbWEOX3r (ORCPT ); Mon, 15 May 2006 19:29:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750771AbWEOX3r (ORCPT ); Mon, 15 May 2006 19:29:47 -0400 Received: from palrel10.hp.com ([156.153.255.245]:48289 "EHLO palrel10.hp.com") by vger.kernel.org with ESMTP id S1750769AbWEOX3q (ORCPT ); Mon, 15 May 2006 19:29:46 -0400 Date: Mon, 15 May 2006 16:30:49 -0700 From: Grant Grundler To: Roland Dreier Cc: Grant Grundler , "Bryan O'Sullivan" , Segher Boessenkool , linux-kernel@vger.kernel.org, openib-general@openib.org Subject: Re: [openib-general] Re: [PATCH 21 of 53] ipath - use phys_to_virt instead of bus_to_virt Message-ID: <20060515233049.GM29082@esmail.cup.hp.com> References: <4e0a07d20868c6c4f038.1147477386@eng-12.pathscale.com> <1147728081.2773.25.camel@chalcedony.pathscale.com> <20060515231342.GK29082@esmail.cup.hp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.11+cvs20060403 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1149 Lines: 26 On Mon, May 15, 2006 at 04:16:45PM -0700, Roland Dreier wrote: > Grant> Or figure out which openib.org interface has to change so > Grant> the original virt addresses that were registered/handed to > Grant> the ULP are passed down to the low level interface driver > Grant> too. Seems like a more obvious way to fix the problem. > Grant> Someone did suggest this already, right? > > It's been suggested many times, but no one ever comes up with a way to > handle the fact that RDMA means that addresses come from remote > systems as well as being passed in through an API. Aren't remote addresses handled differently than local ones? ULP has to map local addresses. We can't map remote ones (remote host maps it). The ULP must know the difference and can tell the lower level driver which is which. Sorry, I hope my ignorance of RDMA isn't getting in the way again. thanks, grant - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/