[dpdk-dev] [PATCH] telemetry: fix incorrect stat name to id mapping

[Bruce Richardson]

If we have two NIC ports which have a different set of NIC stats we can
end up having two different stats registered with xstats with the same
name. [Since the stats are updated in bulk as a contiguous set, the
second driver re-using the registration of the first is not possible.]

This causes issues with the invalid stat for one driver being found due to
a lookup by name which is unnecessary. Instead of getting stat names
involved do the lookup by ID instead.

CC: stable at dpdk.org
Fixes: 1b756087db93 ("telemetry: add parser for client socket messages")

Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
---
 lib/librte_telemetry/rte_telemetry_parser.c | 22 +++++++++------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/lib/librte_telemetry/rte_telemetry_parser.c b/lib/librte_telemetry/rte_telemetry_parser.c
index 03a58a2fd..9bc16eef4 100644
--- a/lib/librte_telemetry/rte_telemetry_parser.c
+++ b/lib/librte_telemetry/rte_telemetry_parser.c
@@ -256,7 +256,7 @@ rte_telemetry_command_ports_all_stat_values(struct telemetry_impl *telemetry,
 	 int action, json_t *data)
 {
 	int ret, num_metrics, i, p;
-	struct rte_metric_name *names;
+	struct rte_metric_value *values;
 	uint64_t num_port_ids = 0;
 	uint32_t port_ids[RTE_MAX_ETHPORTS];
 
@@ -281,7 +281,7 @@ rte_telemetry_command_ports_all_stat_values(struct telemetry_impl *telemetry,
 		return -1;
 	}
 
-	num_metrics = rte_metrics_get_names(NULL, 0);
+	num_metrics = rte_metrics_get_values(0, NULL, 0);
 	if (num_metrics < 0) {
 		TELEMETRY_LOG_ERR("Cannot get metrics count");
 
@@ -300,8 +300,8 @@ rte_telemetry_command_ports_all_stat_values(struct telemetry_impl *telemetry,
 		return -1;
 	}
 
-	names = malloc(sizeof(struct rte_metric_name) * num_metrics);
-	if (names == NULL) {
+	values = malloc(sizeof(struct rte_metric_value) * num_metrics);
+	if (values == NULL) {
 		TELEMETRY_LOG_ERR("Cannot allocate memory");
 		ret = rte_telemetry_send_error_response(telemetry,
 			 -ENOMEM);
@@ -310,7 +310,6 @@ rte_telemetry_command_ports_all_stat_values(struct telemetry_impl *telemetry,
 		return -1;
 	}
 
-	const char *stat_names[num_metrics];
 	uint32_t stat_ids[num_metrics];
 
 	RTE_ETH_FOREACH_DEV(p) {
@@ -328,16 +327,13 @@ rte_telemetry_command_ports_all_stat_values(struct telemetry_impl *telemetry,
 		goto fail;
 	}
 
-	ret = rte_metrics_get_names(names, num_metrics);
-	for (i = 0; i < num_metrics; i++)
-		stat_names[i] = names[i].name;
-
-	ret = rte_telemetry_stat_names_to_ids(telemetry, stat_names, stat_ids,
-		num_metrics);
+	ret = rte_metrics_get_values(port_ids[0], values, num_metrics);
 	if (ret < 0) {
-		TELEMETRY_LOG_ERR("Could not convert stat names to IDs");
+		TELEMETRY_LOG_ERR("Could not get stat values");
 		goto fail;
 	}
+	for (i = 0; i < num_metrics; i++)
+		stat_ids[i] = values[i].key;
 
 	ret = rte_telemetry_send_ports_stats_values(stat_ids, num_metrics,
 		port_ids, num_port_ids, telemetry);
@@ -349,7 +345,7 @@ rte_telemetry_command_ports_all_stat_values(struct telemetry_impl *telemetry,
 	return 0;
 
 fail:
-	free(names);
+	free(values);
 	return -1;
 }
 
-- 
2.20.1