siw_invalidate_stag
int siw_invalidate_stag(struct ib_pd *pd, u32 stag);
rv = siw_invalidate_stag(qp->pd, srx->inval_stag);
rv = siw_invalidate_stag(qp->pd, wqe->sqe.sge[0].lkey);
rv = siw_invalidate_stag(qp->pd, wqe->sqe.rkey);