[PATCH for-next v6 7/7] RDMA/rxe: Add module parameters for mcast limits

[Bob Pearson <rpearsonhpe@xxxxxxxxx>]

Add module parameters for max_mcast_grp, max_mcast_qp_attach,
and tot_mcast_qp_attach to allow setting these parameters to
small values when the driver is loaded to support testing these
limits.

Signed-off-by: Bob Pearson <rpearsonhpe@xxxxxxxxx>
---
 drivers/infiniband/sw/rxe/Makefile    |  3 ++-
 drivers/infiniband/sw/rxe/rxe.c       |  6 +++---
 drivers/infiniband/sw/rxe/rxe_param.c | 23 +++++++++++++++++++++++
 drivers/infiniband/sw/rxe/rxe_param.h |  4 ++++
 4 files changed, 32 insertions(+), 4 deletions(-)
 create mode 100644 drivers/infiniband/sw/rxe/rxe_param.c

diff --git a/drivers/infiniband/sw/rxe/Makefile b/drivers/infiniband/sw/rxe/Makefile
index 5395a581f4bb..b183924ea01d 100644
--- a/drivers/infiniband/sw/rxe/Makefile
+++ b/drivers/infiniband/sw/rxe/Makefile
@@ -22,4 +22,5 @@ rdma_rxe-y := \
 	rxe_mcast.o \
 	rxe_task.o \
 	rxe_net.o \
-	rxe_hw_counters.o
+	rxe_hw_counters.o \
+	rxe_param.o
diff --git a/drivers/infiniband/sw/rxe/rxe.c b/drivers/infiniband/sw/rxe/rxe.c
index 147cb16e937d..599fbfdeb426 100644
--- a/drivers/infiniband/sw/rxe/rxe.c
+++ b/drivers/infiniband/sw/rxe/rxe.c
@@ -59,9 +59,9 @@ static void rxe_init_device_param(struct rxe_dev *rxe)
 	rxe->attr.max_res_rd_atom		= RXE_MAX_RES_RD_ATOM;
 	rxe->attr.max_qp_init_rd_atom		= RXE_MAX_QP_INIT_RD_ATOM;
 	rxe->attr.atomic_cap			= IB_ATOMIC_HCA;
-	rxe->attr.max_mcast_grp			= RXE_MAX_MCAST_GRP;
-	rxe->attr.max_mcast_qp_attach		= RXE_MAX_MCAST_QP_ATTACH;
-	rxe->attr.max_total_mcast_qp_attach	= RXE_MAX_TOT_MCAST_QP_ATTACH;
+	rxe->attr.max_mcast_grp			= rxe_max_mcast_grp;
+	rxe->attr.max_mcast_qp_attach		= rxe_max_mcast_qp_attach;
+	rxe->attr.max_total_mcast_qp_attach	= rxe_max_tot_mcast_qp_attach;
 	rxe->attr.max_ah			= RXE_MAX_AH;
 	rxe->attr.max_srq			= RXE_MAX_SRQ;
 	rxe->attr.max_srq_wr			= RXE_MAX_SRQ_WR;
diff --git a/drivers/infiniband/sw/rxe/rxe_param.c b/drivers/infiniband/sw/rxe/rxe_param.c
new file mode 100644
index 000000000000..27873e7de753
--- /dev/null
+++ b/drivers/infiniband/sw/rxe/rxe_param.c
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/*
+ * Copyright (c) 2023 Hewlett Packard Enterprise, Inc. All rights reserved.
+ */
+
+#include "rxe.h"
+
+int rxe_max_mcast_grp = RXE_MAX_MCAST_GRP;
+module_param_named(max_mcast_grp, rxe_max_mcast_grp, int, 0444);
+MODULE_PARM_DESC(max_mcast_grp,
+	"Maximum number of multicast groups per device");
+
+int rxe_max_mcast_qp_attach = RXE_MAX_MCAST_QP_ATTACH;
+module_param_named(max_mcast_qp_attach, rxe_max_mcast_qp_attach,
+		int, 0444);
+MODULE_PARM_DESC(max_mcast_qp_attach,
+	"Maximum number of QPs attached to a multicast group");
+
+int rxe_max_tot_mcast_qp_attach = RXE_MAX_TOT_MCAST_QP_ATTACH;
+module_param_named(max_tot_mcast_qp_attach, rxe_max_tot_mcast_qp_attach,
+		int, 0444);
+MODULE_PARM_DESC(max_tot_mcast_qp_attach,
+	"Maximum total number of QPs attached to multicast groups per device");
diff --git a/drivers/infiniband/sw/rxe/rxe_param.h b/drivers/infiniband/sw/rxe/rxe_param.h
index d2f57ead78ad..d6fe50f5f483 100644
--- a/drivers/infiniband/sw/rxe/rxe_param.h
+++ b/drivers/infiniband/sw/rxe/rxe_param.h
@@ -125,6 +125,10 @@ enum rxe_device_param {
 	RXE_VENDOR_ID			= 0XFFFFFF,
 };
 
+extern int rxe_max_mcast_grp;
+extern int rxe_max_mcast_qp_attach;
+extern int rxe_max_tot_mcast_qp_attach;
+
 /* default/initial rxe port parameters */
 enum rxe_port_param {
 	RXE_PORT_GID_TBL_LEN		= 1024,
-- 
2.40.1