RX_FETCH_INDEX
ENIC_BUS_WRITE_4(rq->ctrl, RX_FETCH_INDEX, 0);
ENIC_BUS_WRITE_4(rq->ctrl, RX_FETCH_INDEX, fetch_index);
fetch_index = ENIC_BUS_READ_4(rq->ctrl, RX_FETCH_INDEX);
fetch_index = ENIC_BUS_READ_4(rq->ctrl, RX_FETCH_INDEX);