RDMA/rxe: Check the last packet by RXE_END_MASK

It's wrong to check the last packet by RXE_COMP_MASK because the flag is
to indicate if responder needs to generate a completion.

Fixes: 9fcd67d1 ("IB/rxe: increment msn only when completing a request")
Fixes: 8700e3e7 ("Soft RoCE driver")
Link: https://lore.kernel.org/r/20211229034438.1854908-1-yangx.jy@fujitsu.comSigned-off-by: Xiao Yang <yangx.jy@fujitsu.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/sw/rxe/rxe_resp.c

@@ -814,6 +814,10 @@ static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
 			return RESPST_ERR_INVALIDATE_RKEY;
 	}
 
+	if (pkt->mask & RXE_END_MASK)
+		/* We successfully processed this new request. */
+		qp->resp.msn++;
+
 	/* next expected psn, read handles this separately */
 	qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
 	qp->resp.ack_psn = qp->resp.psn;
@@ -821,11 +825,9 @@ static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
 	qp->resp.opcode = pkt->opcode;
 	qp->resp.status = IB_WC_SUCCESS;
 
-	if (pkt->mask & RXE_COMP_MASK) {
-		/* We successfully processed this new request. */
-		qp->resp.msn++;
+	if (pkt->mask & RXE_COMP_MASK)
 		return RESPST_COMPLETE;
-	} else if (qp_type(qp) == IB_QPT_RC)
+	else if (qp_type(qp) == IB_QPT_RC)
 		return RESPST_ACKNOWLEDGE;
 	else
 		return RESPST_CLEANUP;