Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755157AbYHJMuF (ORCPT ); Sun, 10 Aug 2008 08:50:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753573AbYHJMtv (ORCPT ); Sun, 10 Aug 2008 08:49:51 -0400 Received: from srv5.dvmed.net ([207.36.208.214]:40609 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753447AbYHJMtu (ORCPT ); Sun, 10 Aug 2008 08:49:50 -0400 Message-ID: <489EE3DC.9060202@pobox.com> Date: Sun, 10 Aug 2008 08:49:32 -0400 From: Jeff Garzik User-Agent: Thunderbird 2.0.0.16 (X11/20080723) MIME-Version: 1.0 To: Alan Cox CC: Roland Dreier , Steve Wise , davem@davemloft.net, Divy Le Ray , Karen Xie , netdev@vger.kernel.org, open-iscsi@googlegroups.com, michaelc@cs.wisc.edu, daisyc@us.ibm.com, wenxiong@us.ibm.com, bhua@us.ibm.com, Dimitrios Michailidis , Casey Leedom , linux-scsi , LKML Subject: Re: [RFC][PATCH 1/1] cxgb3i: cxgb3 iSCSI initiator References: <200807300019.m6U0JkdY012558@localhost.localdomain> <200807311752.00911.divy@chelsio.com> <200808071145.03848.divy@chelsio.com> <489C8BEB.8060001@opengridcomputing.com> <489CC58D.4010606@pobox.com> <20080810101935.5c8e8e9a@lxorguk.ukuu.org.uk> In-Reply-To: <20080810101935.5c8e8e9a@lxorguk.ukuu.org.uk> Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -4.4 (----) X-Spam-Report: SpamAssassin version 3.2.5 on srv5.dvmed.net summary: Content analysis details: (-4.4 points, 5.0 required) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 938 Lines: 25 Alan Cox wrote: >> - It doesn't work in theory, because the suggestion (I guess) is that >> the iSCSI HBA has its own MAC and IP and behaves like a separate > > The iSCSI HBA is its own system - that is the root of the problem. Indeed. Just like with TOE, from the net stack's point of view, an iSCSI HBA is essentially a wholly asynchronous remote system [with a really fast communication bus like PCI Express]. As such, the task becomes updating the net stack such that formerly-private resources are now shared with an independent, external system... with all the complexity, additional failure modes, and additional security complications that come along with that. Jeff -- 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/