From patchwork Sat Dec 10 15:30:38 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Coquelin X-Patchwork-Id: 704736 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org 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 ozlabs.org (Postfix) with ESMTPS id 3tbY8X6Frqz9sD6 for ; Sun, 11 Dec 2016 02:35:40 +1100 (AEDT) Received: from localhost ([::1]:52116 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cFjgY-0003pA-Sc for incoming@patchwork.ozlabs.org; Sat, 10 Dec 2016 10:35:38 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35050) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cFjcE-0000aA-Te for qemu-devel@nongnu.org; Sat, 10 Dec 2016 10:31:13 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cFjcB-0007Qa-Ot for qemu-devel@nongnu.org; Sat, 10 Dec 2016 10:31:10 -0500 Received: from mx1.redhat.com ([209.132.183.28]:39676) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cFjcB-0007QO-Gd for qemu-devel@nongnu.org; Sat, 10 Dec 2016 10:31:07 -0500 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (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 AF267C057FA9; Sat, 10 Dec 2016 15:31:06 +0000 (UTC) Received: from max-t460s.redhat.com ([10.36.126.4]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id uBAFUmUq001725; Sat, 10 Dec 2016 10:31:02 -0500 From: Maxime Coquelin To: mst@redhat.com, aconole@redhat.com, pbonzini@redhat.com, qemu-devel@nongnu.org, jasowang@redhat.com, yuanhan.liu@linux.intel.com Date: Sat, 10 Dec 2016 16:30:38 +0100 Message-Id: <20161210153038.9184-4-maxime.coquelin@redhat.com> In-Reply-To: <20161210153038.9184-1-maxime.coquelin@redhat.com> References: <20161210153038.9184-1-maxime.coquelin@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Sat, 10 Dec 2016 15:31:06 +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] [PATCH v4 3/3] virtio-net: Add MTU feature support 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: mlureau@redhat.com, Maxime Coquelin , fbl@redhat.com, ktraynor@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch allows advising guest with host MTU's by setting host_mtu parameter. If VIRTIO_NET_F_MTU has been successfully negotiated, MTU value is passed to the backend. Cc: Michael S. Tsirkin Cc: Aaron Conole --- hw/net/virtio-net.c | 19 +++++++++++++++++++ include/hw/virtio/virtio-net.h | 1 + 2 files changed, 20 insertions(+) diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index 5009533..b6da529 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -55,6 +55,8 @@ static VirtIOFeature feature_sizes[] = { .end = endof(struct virtio_net_config, status)}, {.flags = 1 << VIRTIO_NET_F_MQ, .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, + {.flags = 1 << VIRTIO_NET_F_MTU, + .end = endof(struct virtio_net_config, mtu)}, {} }; @@ -81,6 +83,7 @@ static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) virtio_stw_p(vdev, &netcfg.status, n->status); virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues); + virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu); memcpy(netcfg.mac, n->mac, ETH_ALEN); memcpy(config, &netcfg, n->config_size); } @@ -152,6 +155,16 @@ static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) qemu_net_queue_purge(qnc->incoming_queue, qnc->peer); } + if (virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_MTU)) { + r = vhost_net_set_mtu(get_vhost_net(nc->peer), n->net_conf.mtu); + if (r < 0) { + error_report("%uBytes MTU not supported by the backend", + n->net_conf.mtu); + + return; + } + } + n->vhost_started = 1; r = vhost_net_start(vdev, n->nic->ncs, queues); if (r < 0) { @@ -1695,6 +1708,7 @@ static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features) { int i, config_size = 0; virtio_add_feature(&host_features, VIRTIO_NET_F_MAC); + for (i = 0; feature_sizes[i].flags != 0; i++) { if (host_features & feature_sizes[i].flags) { config_size = MAX(feature_sizes[i].end, config_size); @@ -1724,6 +1738,10 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp) NetClientState *nc; int i; + if (n->net_conf.mtu) { + n->host_features |= (0x1 << VIRTIO_NET_F_MTU); + } + virtio_net_set_config_size(n, n->host_features); virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); @@ -1922,6 +1940,7 @@ static Property virtio_net_properties[] = { DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE), + DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0), DEFINE_PROP_END_OF_LIST(), }; diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h index 0ced975..8ea56a8 100644 --- a/include/hw/virtio/virtio-net.h +++ b/include/hw/virtio/virtio-net.h @@ -36,6 +36,7 @@ typedef struct virtio_net_conf int32_t txburst; char *tx; uint16_t rx_queue_size; + uint16_t mtu; } virtio_net_conf; /* Maximum packet size we can receive from tap device: header + 64k */