WX_RX_DESC
rx_desc = WX_RX_DESC(rx_ring, i);
rx_desc = WX_RX_DESC(rx_ring, 0);
prefetch(WX_RX_DESC(rx_ring, ntc));
rx_desc = WX_RX_DESC(rx_ring, rx_ring->next_to_clean);
rx_desc = WX_RX_DESC(ring, 0);