From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47912) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cwEQE-0001vx-KN for qemu-devel@nongnu.org; Thu, 06 Apr 2017 16:54:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cwEQ9-000806-QN for qemu-devel@nongnu.org; Thu, 06 Apr 2017 16:54:26 -0400 Received: from quartz.orcorp.ca ([184.70.90.242]:47873) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1cwEQ9-0007zK-H3 for qemu-devel@nongnu.org; Thu, 06 Apr 2017 16:54:21 -0400 Date: Thu, 6 Apr 2017 14:54:16 -0600 From: Jason Gunthorpe Message-ID: <20170406205416.GB27155@obsidianresearch.com> References: <1490872341-9959-1-git-send-email-marcel@redhat.com> <20170330141314.GM20443@mtr-leonro.local> <5e952524-7c2d-b4da-4bd7-6437830a40d8@redhat.com> <20170403062314.GO20443@mtr-leonro.local> <20170404173349.GY20443@mtr-leonro.local> <20170406194552.GB2170@yuval-lap> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170406194552.GB2170@yuval-lap> Subject: Re: [Qemu-devel] [PATCH RFC] hw/pvrdma: Proposal of a new pvrdma device List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Yuval Shaia Cc: Leon Romanovsky , Marcel Apfelbaum , Doug Ledford , qemu-devel@nongnu.org, linux-rdma@vger.kernel.org On Thu, Apr 06, 2017 at 10:45:54PM +0300, Yuval Shaia wrote: > > Just add my 2 cents. You didn't answer on my question about other possible > > implementations. It can be SoftRoCE loopback optimizations, special ULP, > > RDMA transport, virtual driver with multiple VFs and single PF. > > Please see my response to Jason's comments - eventually, when a support for > VM to external host communication will be added - kdbr will become ULP as > well. So, is KDBR only to be used on the HV side? Ie it never shows up in the VM? That is even weirder, we certainly do not want to see a kernel RDMA ULP for any of this - the entire point of RDMA is to let user space implement their protocols without needing a unique kernel component!! Jason