From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37685) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c7UhJ-0004f4-Er for qemu-devel@nongnu.org; Thu, 17 Nov 2016 16:58:22 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1c7UhG-0007lR-D6 for qemu-devel@nongnu.org; Thu, 17 Nov 2016 16:58:21 -0500 Received: from mx1.redhat.com ([209.132.183.28]:58326) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1c7UhG-0007lK-87 for qemu-devel@nongnu.org; Thu, 17 Nov 2016 16:58:18 -0500 From: Maxime Coquelin Date: Thu, 17 Nov 2016 22:58:05 +0100 Message-Id: <1479419887-10515-2-git-send-email-maxime.coquelin@redhat.com> In-Reply-To: <1479419887-10515-1-git-send-email-maxime.coquelin@redhat.com> References: <1479419887-10515-1-git-send-email-maxime.coquelin@redhat.com> Subject: [Qemu-devel] [RFC v2 1/3] vhost-user: Add new protocol feature MTU List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: mst@redhat.com, aconole@redhat.com, pbonzini@redhat.com, qemu-devel@nongnu.org Cc: jasowang@redhat.com, yuanhan.liu@linux.intel.com, Maxime Coquelin This patch adds VHOST_USER_PROTOCOL_F_MTU protocol feature. If supported, QEMU sends VHOST_USER_GET_MTU request to the client, and expects a u64 reply containing the MTU advised for the guest. Cc: Michael S. Tsirkin Cc: Aaron Conole Signed-off-by: Maxime Coquelin --- hw/virtio/vhost-user.c | 11 +++++++++++ include/hw/virtio/vhost.h | 1 + 2 files changed, 12 insertions(+) diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 7ee92b3..eaf007d 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_GET_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_GET_MTU: return true; default: return false; @@ -602,6 +605,14 @@ static int vhost_user_init(struct vhost_dev *dev, void *opaque) return err; } } + + /* query the MTU we support if backend supports MTU feature */ + if (dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_MTU)) { + err = vhost_user_get_u64(dev, VHOST_USER_GET_MTU, &dev->mtu); + if (err < 0) { + return err; + } + } } if (dev->migration_blocker == NULL && diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h index 1fe5aad..c674a05 100644 --- a/include/hw/virtio/vhost.h +++ b/include/hw/virtio/vhost.h @@ -51,6 +51,7 @@ struct vhost_dev { uint64_t backend_features; uint64_t protocol_features; uint64_t max_queues; + uint64_t mtu; bool started; bool log_enabled; uint64_t log_size; -- 2.7.4