Perftest: Query correct RDMA/atomic caps for DC

Currently, verbs exposed those caps only for RC,
therefore for DC we need to query it through DEVX.

Without this fix, we use the RC caps for DC QPs, this
cause perfomance degredation in ConnectX-7.

Signed-off-by: Maor Gottlieb <maorg@nvidia.com>

configure.ac

@@ -142,6 +142,14 @@ AC_TRY_LINK([
         [int x = MLX5DV_QP_INIT_ATTR_MASK_QP_CREATE_FLAGS;],[HAVE_MLX5DV=yes], [HAVE_MLX5DV=no])
 AM_CONDITIONAL([HAVE_MLX5DV],[test "x$HAVE_MLX5DV" = "xyes"])
 
+AC_TRY_LINK([
+#include <infiniband/mlx5dv.h>],
+        [int x = __devx_dw_off(32);],[HAVE_MLX5_DEVX=yes], [HAVE_MLX5_DEVX=no])
+AM_CONDITIONAL([HAVE_MLX5_DEVX],[test "x$HAVE_MLX5_DEVX" = "xyes"])
+if [test $HAVE_MLX5_DEVX = yes] && [test $HAVE_MLX5DV = yes];  then
+            AC_DEFINE([HAVE_MLX5_DEVX], [1], [Have MLX5 DEVX support])
+fi
+
 AC_TRY_LINK([
 #include <infiniband/mlx5dv.h>],
         [int x = MLX5DV_QP_INIT_ATTR_MASK_DCI_STREAMS;],[HAVE_DCS=yes], [HAVE_DCS=no])

src/perftest_parameters.c

@@ -10,6 +10,7 @@
 #include <sys/stat.h>
 #endif
 #include "perftest_parameters.h"
+#include "mlx5_devx.h"
 #include "raw_ethernet_resources.h"
 #include<math.h>
 #ifdef HAVE_RO
@@ -1974,17 +1975,49 @@ static int set_link_layer(struct ibv_context *context, struct perftest_parameter
 	return SUCCESS;
 }
 
+static int get_device_max_reads_dc(struct ibv_context *context)
+{
+#ifdef HAVE_MLX5_DEVX
+	uint32_t in[DEVX_ST_SZ_DW(query_hca_cap_in)] = {};
+	uint32_t out[DEVX_ST_SZ_DW(query_hca_cap_out)] = {};
+	uint16_t opmod = HCA_CAP_OPMOD_GET_CUR;
+	int ret;
+
+	DEVX_SET(query_hca_cap_in, in, opcode, MLX5_CMD_OP_QUERY_HCA_CAP);
+	DEVX_SET(query_hca_cap_in, in, op_mod, opmod);
+
+	ret = mlx5dv_devx_general_cmd(context, in, sizeof(in), out,
+				      sizeof(out));
+	if (!ret)
+		return (1 << DEVX_GET(query_hca_cap_out, out,
+				      cmd_hca_cap.log_max_ra_req_dc));
+#endif
+	return 0;
+}
+
+static int get_device_max_reads(struct ibv_context *context,
+				struct perftest_parameters *user_param)
+{
+	struct ibv_device_attr attr;
+	int max_reads = 0;
+
+	if (user_param->connection_type == DC)
+		max_reads = get_device_max_reads_dc(context);
+	if (!max_reads && !ibv_query_device(context,&attr))
+		max_reads = attr.max_qp_rd_atom;
+	return max_reads;
+}
+
 /******************************************************************************
  *
  ******************************************************************************/
-static int ctx_set_out_reads(struct ibv_context *context,int num_user_reads)
+static int ctx_set_out_reads(struct ibv_context *context,
+			     struct perftest_parameters *user_param)
 {
 	int max_reads = 0;
-	struct ibv_device_attr attr;
+	int num_user_reads = user_param->out_reads;
 
-	if (!ibv_query_device(context,&attr)) {
-		max_reads = attr.max_qp_rd_atom;
-	}
+	max_reads = get_device_max_reads(context, user_param);
 
 	if (num_user_reads > max_reads) {
 		printf(RESULT_LINE);
@@ -3043,7 +3076,7 @@ int check_link_and_mtu(struct ibv_context *context,struct perftest_parameters *u
 	ctx_set_max_inline(context,user_param);
 
 	if (user_param->verb == READ || user_param->verb == ATOMIC)
-		user_param->out_reads = ctx_set_out_reads(context,user_param->out_reads);
+		user_param->out_reads = ctx_set_out_reads(context,user_param);
 	else
 		user_param->out_reads = 1;
 
@@ -3109,7 +3142,7 @@ int check_link(struct ibv_context *context,struct perftest_parameters *user_para
 	ctx_set_max_inline(context,user_param);
 
 	if (user_param->verb == READ || user_param->verb == ATOMIC)
-		user_param->out_reads = ctx_set_out_reads(context,user_param->out_reads);
+		user_param->out_reads = ctx_set_out_reads(context,user_param);
 	else
 		user_param->out_reads = 1;