From patchwork Wed Nov 30 10:10:15 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Coquelin X-Patchwork-Id: 700953 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3tTGXt5Ghsz9t1T for ; Wed, 30 Nov 2016 21:16:30 +1100 (AEDT) Received: from localhost ([::1]:42553 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cC1wB-0000P9-Na for incoming@patchwork.ozlabs.org; Wed, 30 Nov 2016 05:16:27 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41139) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cC1qW-0003wh-T7 for qemu-devel@nongnu.org; Wed, 30 Nov 2016 05:10:37 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cC1qV-000185-KD for qemu-devel@nongnu.org; Wed, 30 Nov 2016 05:10:36 -0500 Received: from mx1.redhat.com ([209.132.183.28]:44408) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cC1qU-000173-Vy for qemu-devel@nongnu.org; Wed, 30 Nov 2016 05:10:35 -0500 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 35D3961BBE; Wed, 30 Nov 2016 10:10:34 +0000 (UTC) Received: from max-t460s.redhat.com (vpn1-6-15.ams2.redhat.com [10.36.6.15]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id uAUAAOuG030698; Wed, 30 Nov 2016 05:10:29 -0500 From: Maxime Coquelin To: mst@redhat.com, aconole@redhat.com, pbonzini@redhat.com, qemu-devel@nongnu.org, fbl@redhat.com, berrange@redhat.com, mlureau@redhat.com, ktraynor@redhat.com Date: Wed, 30 Nov 2016 11:10:15 +0100 Message-Id: <20161130101017.13382-2-maxime.coquelin@redhat.com> In-Reply-To: <20161130101017.13382-1-maxime.coquelin@redhat.com> References: <20161130101017.13382-1-maxime.coquelin@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Wed, 30 Nov 2016 10:10:34 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [RFC v3 1/3] vhost-user: Add MTU protocol feature and op 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: Maxime Coquelin , jasowang@redhat.com, yuanhan.liu@linux.intel.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch implements VHOST_USER_PROTOCOL_F_MTU protocol feature and VHOST_USER_SET_MTU request so that the backend gets notified of the user defined host MTU. Vhost-net driver sends this request through a new vhost_net_set_mtu vhost_ops entry. Cc: Michael S. Tsirkin Cc: Aaron Conole Signed-off-by: Maxime Coquelin --- docs/specs/vhost-user.txt | 13 +++++++++++++ hw/virtio/vhost-user.c | 13 +++++++++++++ include/hw/virtio/vhost-backend.h | 2 ++ 3 files changed, 28 insertions(+) diff --git a/docs/specs/vhost-user.txt b/docs/specs/vhost-user.txt index 7890d71..1740baa 100644 --- a/docs/specs/vhost-user.txt +++ b/docs/specs/vhost-user.txt @@ -259,6 +259,7 @@ Protocol features #define VHOST_USER_PROTOCOL_F_LOG_SHMFD 1 #define VHOST_USER_PROTOCOL_F_RARP 2 #define VHOST_USER_PROTOCOL_F_REPLY_ACK 3 +#define VHOST_USER_PROTOCOL_F_MTU 4 Message types ------------- @@ -470,6 +471,18 @@ 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_MTU + + Id: 20 + Equivalent ioctl: N/A + Master payload: u64 + + Set host MTU value exposed to the guest. + This request should be sent only when VIRTIO_NET_F_MTU feature has been + successfully negotiated, VHOST_USER_F_PROTOCOL_FEATURES is present in + VHOST_USER_GET_FEATURES and protocol feature bit VHOST_USER_PROTOCOL_F_MTU + is present in VHOST_USER_GET_PROTOCOL_FEATURES. + VHOST_USER_PROTOCOL_F_REPLY_ACK: ------------------------------- The original vhost-user specification only demands replies for certain diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 7ee92b3..86e8255 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -32,6 +32,7 @@ enum VhostUserProtocolFeature { VHOST_USER_PROTOCOL_F_LOG_SHMFD = 1, VHOST_USER_PROTOCOL_F_RARP = 2, VHOST_USER_PROTOCOL_F_REPLY_ACK = 3, + VHOST_USER_PROTOCOL_F_MTU = 4, VHOST_USER_PROTOCOL_F_MAX }; @@ -59,6 +60,7 @@ typedef enum VhostUserRequest { VHOST_USER_GET_QUEUE_NUM = 17, VHOST_USER_SET_VRING_ENABLE = 18, VHOST_USER_SEND_RARP = 19, + VHOST_USER_SET_MTU = 20, VHOST_USER_MAX } VhostUserRequest; @@ -186,6 +188,7 @@ static bool vhost_user_one_time_request(VhostUserRequest request) case VHOST_USER_RESET_OWNER: case VHOST_USER_SET_MEM_TABLE: case VHOST_USER_GET_QUEUE_NUM: + case VHOST_USER_SET_MTU: return true; default: return false; @@ -685,6 +688,15 @@ static bool vhost_user_can_merge(struct vhost_dev *dev, return mfd == rfd; } +static int vhost_user_net_set_mtu(struct vhost_dev *dev, uint16_t mtu) +{ + if (dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_MTU)) { + return vhost_user_set_u64(dev, VHOST_USER_SET_MTU, (uint64_t)mtu); + } + + return -1; +} + const VhostOps user_ops = { .backend_type = VHOST_BACKEND_TYPE_USER, .vhost_backend_init = vhost_user_init, @@ -708,4 +720,5 @@ const VhostOps user_ops = { .vhost_requires_shm_log = vhost_user_requires_shm_log, .vhost_migration_done = vhost_user_migration_done, .vhost_backend_can_merge = vhost_user_can_merge, + .vhost_net_set_mtu = vhost_user_net_set_mtu, }; diff --git a/include/hw/virtio/vhost-backend.h b/include/hw/virtio/vhost-backend.h index 6e90703..30abc11 100644 --- a/include/hw/virtio/vhost-backend.h +++ b/include/hw/virtio/vhost-backend.h @@ -32,6 +32,7 @@ typedef int (*vhost_backend_memslots_limit)(struct vhost_dev *dev); typedef int (*vhost_net_set_backend_op)(struct vhost_dev *dev, struct vhost_vring_file *file); +typedef int (*vhost_net_set_mtu_op)(struct vhost_dev *dev, uint16_t mtu); typedef int (*vhost_scsi_set_endpoint_op)(struct vhost_dev *dev, struct vhost_scsi_target *target); typedef int (*vhost_scsi_clear_endpoint_op)(struct vhost_dev *dev, @@ -83,6 +84,7 @@ typedef struct VhostOps { vhost_backend_cleanup vhost_backend_cleanup; vhost_backend_memslots_limit vhost_backend_memslots_limit; vhost_net_set_backend_op vhost_net_set_backend; + vhost_net_set_mtu_op vhost_net_set_mtu; vhost_scsi_set_endpoint_op vhost_scsi_set_endpoint; vhost_scsi_clear_endpoint_op vhost_scsi_clear_endpoint; vhost_scsi_get_abi_version_op vhost_scsi_get_abi_version;