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Diffstat (limited to 'hw')
-rw-r--r--hw/net/virtio-net.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 6f98eab2ba..7b3ad4a9f0 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) {
@@ -1721,6 +1734,7 @@ 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);
@@ -1750,6 +1764,10 @@ 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);
@@ -1948,6 +1966,7 @@ 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(),
};