virtio_queue_poll
while ((vic = virtio_queue_poll(state->vio_rq)) != NULL) {
while ((vic = virtio_queue_poll(vin->vin_vq)) != NULL) {
while ((vic = virtio_queue_poll(vib->vib_vq)) != NULL) {
while ((vic = virtio_queue_poll(vif->vif_ctrl_vq)) == NULL) {
while ((vic = virtio_queue_poll(vif->vif_rx_vq)) != NULL) {
while ((vic = virtio_queue_poll(vif->vif_tx_vq)) != NULL) {
while ((vic = virtio_queue_poll(sc->vs_ctl_vq)) != NULL) {
while ((vic = virtio_queue_poll(sc->vs_evt_vq)) != NULL) {
while ((vic = virtio_queue_poll(sc->vs_cmd_vq)) != NULL) {
virtio_chain_t *virtio_queue_poll(virtio_queue_t *);