mp->sw_if_index = htonl (vif->sw_if_index);
virtio_vring_t *vring = vec_elt_at_index (vif->rxq_vrings, 0);
mp->rx_ring_sz = htons (vring->size);
mp->sw_if_index = htonl (vif->sw_if_index);
virtio_vring_t *vring = vec_elt_at_index (vif->rxq_vrings, 0);
mp->rx_ring_sz = htons (vring->size);