XNB_RING_TYPE_TX
txb = &xnb->ring_configs[XNB_RING_TYPE_TX].back_ring.tx_ring;
&xnb->ring_configs[XNB_RING_TYPE_TX].back_ring.tx_ring;
bzero(&xnb->ring_configs[XNB_RING_TYPE_TX],
if (ring_type == XNB_RING_TYPE_TX) {
&xnb->ring_configs[XNB_RING_TYPE_TX].ring_ref,