RING_GET_RESPONSE
rxresp = RING_GET_RESPONSE(&xnbp->xnb_rx_ring, prod);
RING_GET_RESPONSE(&xnbp->xnb_rx_ring, prod)->status =
txresp = RING_GET_RESPONSE(&xnbp->xnb_tx_ring, i);
rxresp = RING_GET_RESPONSE(&xnbp->xnb_rx_ring, prod);
RING_GET_RESPONSE(&xnbp->xnb_rx_ring, prod)->status =
trp = RING_GET_RESPONSE(&xnfp->xnf_tx_ring, i);
netif_rx_response_t rsp = *RING_GET_RESPONSE(&xnfp->xnf_rx_ring, cons);
rsp = *RING_GET_RESPONSE(&xnfp->xnf_rx_ring, cons);
target = RING_GET_RESPONSE(uring, uring->rsp_cons);