rxe: fix error completion wr_id and qp_num

commit e48d8ed upstream.

Error completions must still contain a valid wr_id and
qp_num such that the consumer can rely on. Correctly
fill these fields in receive error completions.

Reported-by: Walker Benjamin <benjamin.walker@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Zhu Yanjun <yanjun.zhu@oracle.com>
Tested-by: Zhu Yanjun <yanjun.zhu@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: sagigrimberg

drivers/infiniband/sw/rxe/rxe_resp.c

@@ -844,11 +844,16 @@ static enum resp_states do_complete(struct rxe_qp *qp,
 
 	memset(&cqe, 0, sizeof(cqe));
 
-	wc->wr_id		= wqe->wr_id;
-	wc->status		= qp->resp.status;
-	wc->qp			= &qp->ibqp;
+	if (qp->rcq->is_user) {
+		uwc->status             = qp->resp.status;
+		uwc->qp_num             = qp->ibqp.qp_num;
+		uwc->wr_id              = wqe->wr_id;
+	} else {
+		wc->status              = qp->resp.status;
+		wc->qp                  = &qp->ibqp;
+		wc->wr_id               = wqe->wr_id;
+	}
 
-	/* fields after status are not required for errors */
 	if (wc->status == IB_WC_SUCCESS) {
 		wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
 				pkt->mask & RXE_WRITE_MASK) ?