D60218.id188359.diff
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D60218.id188359.diff
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	diff --git a/usr.sbin/bhyve/net_backend_netmap.c b/usr.sbin/bhyve/net_backend_netmap.c
	--- a/usr.sbin/bhyve/net_backend_netmap.c
	+++ b/usr.sbin/bhyve/net_backend_netmap.c
	@@ -259,6 +259,19 @@
	while (head != ring->tail) {
	struct netmap_slot *slot = ring->slot + head;

	+ /*
	+ * A VALE switch fills the slots it has leased in this ring
	+ * and then not used with empty packets. Drop them here: a
	+ * length of 0 tells the caller that there is nothing to
	+ * receive, and the slot would stay at the head of the ring
	+ * forever.
	+ */
	+ if (totlen == 0 && slot->len == 0 &&
	+ (slot->flags & NS_MOREFRAG) == 0) {
	+ head = nm_ring_next(ring, head);
	+ ring->head = ring->cur = head;
	+ continue;
	+ }
	totlen += slot->len;
	if ((slot->flags & NS_MOREFRAG) == 0)
	break;