RDMA/rtrs: RDMA_RXE requires more number of WR

When using rdma_rxe, post_one_recv() returns ENOMEM error due to the full
recv queue.  This patch increase the number of WR for receive queue to
support all devices.

Link: https://lore.kernel.org/r/20210614090337.29557-4-jinpu.wang@ionos.comSigned-off-by: Md Haris Iqbal <haris.iqbal@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Gioh Kim <gi-oh.kim@ionos.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/ulp/rtrs/rtrs-clt.c

@@ -1579,10 +1579,11 @@ static int create_con_cq_qp(struct rtrs_clt_con *con)
 	lockdep_assert_held(&con->con_mutex);
 	if (con->c.cid == 0) {
 		/*
-		 * One completion for each receive and two for each send
-		 * (send request + registration)
+		 * Two (request + registration) completion for send
+		 * Two for recv if always_invalidate is set on server
+		 * or one for recv.
 		 * + 2 for drain and heartbeat
-		 * in case qp gets into error state
+		 * in case qp gets into error state.
 		 */
 		max_send_wr = SERVICE_CON_QUEUE_DEPTH * 2 + 2;
 		max_recv_wr = SERVICE_CON_QUEUE_DEPTH * 2 + 2;

drivers/infiniband/ulp/rtrs/rtrs-srv.c

@@ -1656,7 +1656,7 @@ static int create_con(struct rtrs_srv_sess *sess,
 		 * + 2 for drain and heartbeat
 		 */
 		max_send_wr = SERVICE_CON_QUEUE_DEPTH * 2 + 2;
-		max_recv_wr = SERVICE_CON_QUEUE_DEPTH + 2;
+		max_recv_wr = SERVICE_CON_QUEUE_DEPTH * 2 + 2;
 		cq_size = max_send_wr + max_recv_wr;
 	} else {
 		/*