From patchwork Thu Nov 24 03:20:58 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wang, Wei W" X-Patchwork-Id: 9444733 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A830860235 for ; Thu, 24 Nov 2016 03:25:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9FB96276D6 for ; Thu, 24 Nov 2016 03:25:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9495327CEA; Thu, 24 Nov 2016 03:25:11 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 246FC276D6 for ; Thu, 24 Nov 2016 03:25:11 +0000 (UTC) Received: from localhost ([::1]:37701 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c9ker-00053u-Ur for patchwork-qemu-devel@patchwork.kernel.org; Wed, 23 Nov 2016 22:25:09 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55103) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c9kak-0002IF-Pf for qemu-devel@nongnu.org; Wed, 23 Nov 2016 22:20:55 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1c9kaj-0005Ch-Nu for qemu-devel@nongnu.org; Wed, 23 Nov 2016 22:20:54 -0500 Received: from mga05.intel.com ([192.55.52.43]:7824) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1c9kaj-0005Bk-F4 for qemu-devel@nongnu.org; Wed, 23 Nov 2016 22:20:53 -0500 Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga105.fm.intel.com with ESMTP; 23 Nov 2016 19:20:53 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,690,1473145200"; d="scan'208";a="34962159" Received: from devel-ww.sh.intel.com ([10.239.48.106]) by orsmga005.jf.intel.com with ESMTP; 23 Nov 2016 19:20:51 -0800 From: Wei Wang To: marcandre.lureau@gmail.com, mst@redhat.com, stefanha@redhat.com, pbonzini@redhat.com, qemu-devel@nongnu.org, virtio-comment@lists.oasis-open.org Date: Wed, 23 Nov 2016 22:20:58 -0500 Message-Id: <1479957659-141601-4-git-send-email-wei.w.wang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1479957659-141601-1-git-send-email-wei.w.wang@intel.com> References: <1479957659-141601-1-git-send-email-wei.w.wang@intel.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 192.55.52.43 Subject: [Qemu-devel] [PATCH v2 3/4] spec/vhost-user: add the VHOST_USER_SET_PEER_CONNECTION message X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Wei Wang Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP The VHOST_USER_SET_PEER_CONNECTION message is introduced to manage the vhost-pci dataplane connection status. The slave can use the vhost-pci dataplane to transmit/receive packets to/from the master when the connection is turned ON, and stops using it when the connection is turned OFF. Signed-off-by: Wei Wang --- docs/specs/vhost-user.txt | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/docs/specs/vhost-user.txt b/docs/specs/vhost-user.txt index 3bbe641..fdc99ea 100644 --- a/docs/specs/vhost-user.txt +++ b/docs/specs/vhost-user.txt @@ -130,12 +130,14 @@ is a list of the ones that do: * VHOST_USER_GET_PROTOCOL_FEATURES * VHOST_USER_GET_VRING_BASE * VHOST_USER_SET_LOG_BASE (if VHOST_USER_PROTOCOL_F_LOG_SHMFD) + * VHOST_USER_SET_PEER_CONNECTION [ Also see the section on REPLY_ACK protocol extension. ] Currently, the communication also supports the slave actively sending messages to the master. Here is a list of them: * VHOST_USER_SET_FEATURES + * VHOST_USER_SET_PEER_CONNECTION There are several messages that the master sends with file descriptors passed in the ancillary data: @@ -479,6 +481,39 @@ Message types The first 6 bytes of the payload contain the mac address of the guest to allow the vhost user backend to construct and broadcast the fake RARP. + * VHOST_USER_SET_PEER_CONNECTION + + Id: 20 + Equivalent ioctl: N/A + Master payload: u64 + Slave payload: u64 + + The slave device requests to connect or disconnect to the master device. + The master device may request to disconnect to the slave device. + This request should be sent only when VHOST_USER_PROTOCOL_F_VHOST_PCI has + been negotiated. + + Connection command (ON): If the reply message indicates "success", the + connection status is "active", and the slave can start to transmit and + receive packets to the master through the vhost-pci dataplane. Replying of + this message is asynchronous, because the device needs to talk to the + driver first. + Disconnection command (OFF): If the reply message indicates "success", the + connection status is "inactive". The slave cannot use the vhost-pci + dataplane when the connection is "inactive". Replying of this message is + asynchronous, because the device needs to talk to the driver first. + Creation command (CREATE): Sent by the master to the slave to request for + the creation of a slave device. If the reply messages indicates "success", + it means that the slave is able to create a slave device for the master. + Destroy command (DESTROY): Sent by the master to the slave to request for + the destruction of the slave device. This command should only be sent when + the connection is "inactive". No reply is needed for this command. + + #define VHOST_USER_SET_PEER_CONNECTION_F_OFF 0 + #define VHOST_USER_SET_PEER_CONNECTION_F_ON 1 + #define VHOST_USER_SET_PEER_CONNECTION_F_CREATE 2 + #define VHOST_USER_SET_PEER_CONNECTION_F_DESTROY 3 + VHOST_USER_PROTOCOL_F_REPLY_ACK: ------------------------------- The original vhost-user specification only demands replies for certain