TX_POSTED_INDEX
ENIC_BUS_WRITE_4(wq->ctrl, TX_POSTED_INDEX, head_idx);
ENIC_BUS_WRITE_4(dc2c->wq_ctrl, TX_POSTED_INDEX, new_posted);
ENIC_BUS_WRITE_4(wq->ctrl, TX_POSTED_INDEX, posted_index);
ENIC_BUS_WRITE_4(wq->ctrl, TX_POSTED_INDEX, 0);