Set min_rnr_timer to 12 for RDMA CM case.

Description:
	Default min_rnr_timer value leads to traffic drops
	if running tests with for long duration (1 hour and more)
	in case IB SEND responder side scatter memory is changing.

Signed-off-by: Dmitry Akhmedzhanov <[email protected]>

Author: dimasique1nv

configure.ac

@@ -29,7 +29,7 @@
 # SOFTWARE.
 dnl Process this file with autoconf to produce a configure script.
 
-AC_INIT([perftest],[5.95],[[email protected]])
+AC_INIT([perftest],[5.96],[[email protected]])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_AUX_DIR([config])
 AC_CONFIG_MACRO_DIR([m4])

src/perftest_communication.c

@@ -2215,6 +2215,9 @@ int rdma_cm_connection_request_handler(struct pingpong_context *ctx,
 	char *error_message = "";
 	struct cma_node *cm_node;
 	struct rdma_conn_param conn_param;
+	struct ibv_qp_attr rtr_attr = {
+		.min_rnr_timer = MIN_RNR_TIMER,
+	};
 
 	connection_index = ctx->cma_master.connection_index;
 
@@ -2266,6 +2269,11 @@ int rdma_cm_connection_request_handler(struct pingpong_context *ctx,
 		goto error_2;
 	}
 
+	if (user_param->connection_type == RC)
+	{
+		ibv_modify_qp(ctx->qp[connection_index], &rtr_attr, IBV_QP_MIN_RNR_TIMER);
+	}
+
 	rc = rdma_cm_initialize_ud_connection_parameters(ctx, user_param);
 	if (rc) {
 		error_message = \

src/perftest_resources.c

@@ -2010,7 +2010,7 @@ static int ctx_modify_qp_to_rtr(struct ibv_qp *qp,
 				flags |= IBV_QP_AV | IBV_QP_PATH_MTU;
 				if (is_dc_server_side)
 				{
-					attr->min_rnr_timer = 12;
+					attr->min_rnr_timer = MIN_RNR_TIMER;
 					flags |= IBV_QP_MIN_RNR_TIMER;
 				} //DCT
 			}
@@ -2024,7 +2024,7 @@ static int ctx_modify_qp_to_rtr(struct ibv_qp *qp,
 				if (user_param->connection_type == RC || user_param->connection_type == XRC) {
 
 					attr->max_dest_rd_atomic = my_dest->out_reads;
-					attr->min_rnr_timer = 12;
+					attr->min_rnr_timer = MIN_RNR_TIMER;
 					flags |= (IBV_QP_MIN_RNR_TIMER | IBV_QP_MAX_DEST_RD_ATOMIC);
 				}
 			}

src/perftest_resources.h

@@ -80,6 +80,7 @@
 #define PL			(1)
 #define ATOMIC_ADD_VALUE	(1)
 #define ATOMIC_SWAP_VALUE	(0)
+#define MIN_RNR_TIMER		(12)
 
 /* Space for GRH when we scatter the packet in UD. */
 #define PINGPONG_SEND_WRID	(60)