hns_roce_alloc_db
err = hns_roce_alloc_db(hr_dev, &hr_cq->db, 1);
int hns_roce_alloc_db(struct hns_roce_dev *hr_dev, struct hns_roce_db *db,
ret = hns_roce_alloc_db(hr_dev, &hr_qp->rdb, 0);
ret = hns_roce_alloc_db(hr_dev, &srq->rdb, 1);