From patchwork Thu Apr 11 11:01:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yuval Shaia X-Patchwork-Id: 10895767 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3754B139A for ; Thu, 11 Apr 2019 11:02:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 210D728CD6 for ; Thu, 11 Apr 2019 11:02:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1596628CF6; Thu, 11 Apr 2019 11:02:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A952228CD6 for ; Thu, 11 Apr 2019 11:02:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726599AbfDKLC1 (ORCPT ); Thu, 11 Apr 2019 07:02:27 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:37670 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726629AbfDKLC1 (ORCPT ); Thu, 11 Apr 2019 07:02:27 -0400 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x3BArZxT090391; Thu, 11 Apr 2019 11:02:06 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding; s=corp-2018-07-02; bh=PCog7WmPdrJ3Z4PqseZQAwTpYfReok+Z2nleYdYdSaM=; b=1CRDtqTizOMaOu+/g1KtV0POtgecB//uMm00KfOluexnMU1g6ZmOfSqk4z2GGN3YfEWa ULvyRE5ybAVCw2UyGICOvhmsdzPNFsVIUUc1nHixh6jEH+LG8unE2wysSgQCPZkoGodm O4ZW8FCW533UATxLZrfZvqucCRer6mwnQ1zDlYHXY9ZXliStq9pIrRu3hy1ieAOM686D N/TEKAFyEPqIW4MS5sf02rkoDuNdQpiYQqRTxMIbpjSDCKvtxjlGp8YrWeq0AEgzASqZ epIAXCYuWdEZeBRzsRu0dgecMsHwoHYNqSI//Sfo2SgiBkH5HqhvPS58RqKmeoPqMXKm dw== Received: from aserp3020.oracle.com (aserp3020.oracle.com [141.146.126.70]) by userp2120.oracle.com with ESMTP id 2rpmrqg6s5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 11 Apr 2019 11:02:04 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x3BB1g4D059792; Thu, 11 Apr 2019 11:02:04 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserp3020.oracle.com with ESMTP id 2rpytcq8sr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 11 Apr 2019 11:02:03 +0000 Received: from abhmp0022.oracle.com (abhmp0022.oracle.com [141.146.116.28]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x3BB23DN008373; Thu, 11 Apr 2019 11:02:03 GMT Received: from host4.lan (/77.138.183.59) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 11 Apr 2019 04:02:02 -0700 From: Yuval Shaia To: virtualization@lists.linux-foundation.org, qemu-devel@nongnu.org, mst@redhat.com, cohuck@redhat.com, marcel.apfelbaum@gmail.com, linux-rdma@vger.kernel.org, jgg@mellanox.com Cc: Yuval Shaia Subject: [RFC 0/3] VirtIO RDMA Date: Thu, 11 Apr 2019 14:01:54 +0300 Message-Id: <20190411110157.14252-1-yuval.shaia@oracle.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9223 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904110077 X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9223 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904110077 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Data center backends use more and more RDMA or RoCE devices and more and more software runs in virtualized environment. There is a need for a standard to enable RDMA/RoCE on Virtual Machines. Virtio is the optimal solution since is the de-facto para-virtualizaton technology and also because the Virtio specification allows Hardware Vendors to support Virtio protocol natively in order to achieve bare metal performance. This RFC is an effort to addresses challenges in defining the RDMA/RoCE Virtio Specification and a look forward on possible implementation techniques. Open issues/Todo list: List is huge, this is only start point of the project. Anyway, here is one example of item in the list: - Multi VirtQ: Every QP has two rings and every CQ has one. This means that in order to support for example 32K QPs we will need 64K VirtQ. Not sure that this is reasonable so one option is to have one for all and multiplex the traffic on it. This is not good approach as by design it introducing an optional starvation. Another approach would be multi queues and round-robin (for example) between them. Expectations from this posting: In general, any comment is welcome, starting from hey, drop this as it is a very bad idea, to yeah, go ahead, we really want it. Idea here is that since it is not a minor effort i first want to know if there is some sort interest in the community for such device. The scope of the implementation is limited to probing the device and doing some basic ibverbs commands. Data-path is not yet implemented. So with this one can expect only that driver is (partialy) loaded and basic queries and resource allocation is done. One note regarding the patchset. I know it is not standard to collaps patches from several repos as i did here (qemu and linux) but decided to do it anyway so the whole picture can be seen. patch 1: virtio-net: Move some virtio-net-pci decl to include/hw/virtio This is a prelimenary patch just as a hack so i will not need to impelement new netdev patch 2: hw/virtio-rdma: VirtIO rdma device The implementation of the device patch 3: RDMA/virtio-rdma: VirtIO rdma driver The device driver