D27931.diff
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	diff --git a/sys/dev/virtio/network/if_vtnet.c b/sys/dev/virtio/network/if_vtnet.c
	--- a/sys/dev/virtio/network/if_vtnet.c
	+++ b/sys/dev/virtio/network/if_vtnet.c
	@@ -657,6 +657,20 @@

	negotiated_features = virtio_negotiate_features(dev, features);

	+ if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) {
	+ uint16_t mtu;
	+
	+ mtu = virtio_read_dev_config_2(dev,
	+ offsetof(struct virtio_net_config, mtu));
	+ if (mtu < VTNET_MIN_MTU /* \|\| mtu > VTNET_MAX_MTU */) {
	+ device_printf(dev, "Invalid MTU value: %d. "
	+ "MTU feature disabled.\n", mtu);
	+ features &= ~VIRTIO_NET_F_MTU;
	+ negotiated_features =
	+ virtio_negotiate_features(dev, features);
	+ }
	+ }
	+
	if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) {
	uint16_t npairs;

	diff --git a/sys/dev/virtio/network/if_vtnetvar.h b/sys/dev/virtio/network/if_vtnetvar.h
	--- a/sys/dev/virtio/network/if_vtnetvar.h
	+++ b/sys/dev/virtio/network/if_vtnetvar.h
	@@ -340,6 +340,7 @@
	#define VTNET_LRO_FEATURES (VIRTIO_NET_F_GUEST_TSO4 \| \
	VIRTIO_NET_F_GUEST_TSO6 \| VIRTIO_NET_F_GUEST_ECN)

	+#define VTNET_MIN_MTU 68
	#define VTNET_MAX_MTU 65536
	#define VTNET_MAX_RX_SIZE 65550