From mboxrd@z Thu Jan 1 00:00:00 1970 From: Evgeniy Polyakov Subject: Re: [PATCH v2 04/13] Connection Manager Date: Tue, 5 Dec 2006 18:27:36 +0300 Message-ID: <20061205152736.GA2274@2ka.mipt.ru> References: <20061202224917.27014.15424.stgit@dell3.ogc.int> <20061202224958.27014.65970.stgit@dell3.ogc.int> <20061204110825.GA26251@2ka.mipt.ru> <20061205050725.GA26033@2ka.mipt.ru> <20061205051657.GB26845@2ka.mipt.ru> <1165331676.16087.29.camel@stevo-desktop> Mime-Version: 1.0 Content-Type: text/plain; charset=koi8-r Cc: Roland Dreier , netdev@vger.kernel.org, openib-general@openib.org, linux-kernel@vger.kernel.org Return-path: Received: from relay.2ka.mipt.ru ([194.85.82.65]:60969 "EHLO 2ka.mipt.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S968269AbWLEP1q (ORCPT ); Tue, 5 Dec 2006 10:27:46 -0500 To: Steve Wise Content-Disposition: inline In-Reply-To: <1165331676.16087.29.camel@stevo-desktop> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Tue, Dec 05, 2006 at 09:14:36AM -0600, Steve Wise (swise@opengridcomputing.com) wrote: > Chelsio doesn't implement TCP stack in the driver. Just like Ammasso, > it sends messages to the HW to setup connections. It differs from > Ammasso in at least 2 ways: > > 1) Ammasso does the MPA negotiations in FW/HW. Chelsio does it in the > RDMA driver. So there is code in the Chelsio driver to handle MPA > startup negotiation (the exchange of 2 packets over the TCP connection > while its still in streaming more). BTW: This code _could_ be moved > into the core IWCM if we find it could be used by other rnic devices > (don't know yet). > > 2) Ammasso implments a 100% deep adapter. It does ARP, routing, IP, > TCP, and IWARP protocols all in firmware/hw. It had 2 mac addresses > simulating 2 ethernet ports. One exclusively for RDMA connections, and > one for host stack traffic. Chelsio implements a shallower adapter that > only does TCP in HW. ARP, for instance, is handled by the native stack > and the rdma driver uses netevents to maintain arp tables in the HW for > use by the offloaded TCP connections. So breifly saying - there is TCP stack implementation (including ARP and routing and other parts) in hardware/firmware/driver which is guaranteed to not be visible to host other than in form of high-level dataflow. Am I right here? > Steve. > > > > - > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Evgeniy Polyakov