e1000_adv_rx_desc
size = sizeof (union e1000_adv_rx_desc) * rx_data->ring_size;
rx_data->rbd_ring = (union e1000_adv_rx_desc *)(uintptr_t)
union e1000_adv_rx_desc *rbd;
size = rx_data->ring_size * sizeof (union e1000_adv_rx_desc);
union e1000_adv_rx_desc *current_rbd;
union e1000_adv_rx_desc *rbd_ring; /* Rx desc ring */