Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S968394AbWLEQCM (ORCPT ); Tue, 5 Dec 2006 11:02:12 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S968393AbWLEQCM (ORCPT ); Tue, 5 Dec 2006 11:02:12 -0500 Received: from rrcs-24-153-217-226.sw.biz.rr.com ([24.153.217.226]:55973 "EHLO smtp.opengridcomputing.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S968391AbWLEQCK (ORCPT ); Tue, 5 Dec 2006 11:02:10 -0500 Subject: Re: [PATCH v2 04/13] Connection Manager From: Steve Wise To: Brice Goglin Cc: Roland Dreier , Evgeniy Polyakov , netdev@vger.kernel.org, openib-general@openib.org, linux-kernel@vger.kernel.org In-Reply-To: <45754DE3.1020505@ens-lyon.org> References: <20061202224917.27014.15424.stgit@dell3.ogc.int> <20061202224958.27014.65970.stgit@dell3.ogc.int> <20061204110825.GA26251@2ka.mipt.ru> <1165249251.32724.26.camel@stevo-desktop> <45754DE3.1020505@ens-lyon.org> Content-Type: text/plain Date: Tue, 05 Dec 2006 10:02:09 -0600 Message-Id: <1165334529.16087.69.camel@stevo-desktop> Mime-Version: 1.0 X-Mailer: Evolution 2.4.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1402 Lines: 39 On Tue, 2006-12-05 at 11:45 +0100, Brice Goglin wrote: > Steve Wise wrote: > > There is no SW TCP stack in this driver. The HW supports RDMA over > > TCP/IP/10GbE in HW and this is required for zero-copy RDMA over Ethernet > > (aka iWARP). The device is a 10 GbE device, not Infiniband. > > Then, I wonder why the driver goes in drivers/infiniband/ :) drivers/infiniband support both IB and IWARP transports. > Is there really no way to only keep the actual hw infiniband there, move > iwarp/rdma drivers in drivers/net/something/ and the core stuff in > net/something/ ? > Sure, this _could_ be done, but what I think you're missing is that applications use the interface exported by drivers/infiniband over both IB -and- IWARP transports. The application can be written to not care which transport is used. Examples of apps that can run over both transports using the same common interface: user mode: MVAPICH2, OMPI, IMPI, HPMPI, kernel mode: NFS-RDMA, iSER. Note that the include directory used by drivers/infiniband is now include/rdma. Perhaps drivers/infiniband should be renamed to drivers/rdma as well at some point... Steve. - 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/