DB_TAG
hr_reg_write(&db, DB_TAG, srq->srqn);
hr_reg_write(&cq_db, DB_TAG, hr_cq->cqn);
hr_reg_write(&cq_db, DB_TAG, hr_cq->cqn);
hr_reg_write(&sq_db, DB_TAG, qp->qpn);
hr_reg_write(&rq_db, DB_TAG, qp->qpn);