From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yuval Shaia Subject: Re: [PATCH] IB/ipoib: CSUM support in connected mode Date: Thu, 30 Jul 2015 23:46:36 +0300 Message-ID: <20150730204635.GC3487@yuval-lab> References: <1438256764-9077-1-git-send-email-yuval.shaia@oracle.com> <1438264693.9344.19.camel@opteya.com> <20150730152049.GA29102@yuval-lab> <55BA47F0.5080504@redhat.com> <20150730171538.GA25282@obsidianresearch.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20150730171538.GA25282-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Jason Gunthorpe Cc: Doug Ledford , Yann Droneaud , linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org On Thu, Jul 30, 2015 at 11:15:38AM -0600, Jason Gunthorpe wrote: > On Thu, Jul 30, 2015 at 11:51:12AM -0400, Doug Ledford wrote: > > > In its current state, I have my doubts about this patch. However, it > > seems to me that this should be relatively easy to fix in such a way > > that you get 90%+ of the performance benefit, and can turn it on by > > default, and we don't cause any problems. > > The best way to implement this is to leverage all the checksum > offload work people did for virtualization. > > Forward the checksum offload status through the RC connection and > recover it on the other side. The current approach is to utilize IPoIB's private-data to exchange this information. > > Then the far side stack will know it is dealing with a partial > checksum packet and will properly regenerate the checksum if it > re-transmits. > > ie doing it this way doesn't totally break the netstack :) > > Jason > -- > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in > the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html