[dpdk-dev] [PATCH v2 11/16] examples/l3fwd-power: enable use of new telemetry

[Ciara Power <ciara.power@intel.com>]

The l3fwd-power example app now registers a stats command with
telemetry, and provides a callback function to handle formatting the
power stats.

An example usage is shown below:

Connecting to /var/run/dpdk/rte/dpdk_telemetry.v2
{"pid": 6726, "version": "DPDK 20.05.0-rc0", "max_output_len": 16384}
--> /
{"/": ["/", "/ethdev/link_status", "/ethdev/list", "/ethdev/xstats", \
    "/info", "/l3fwd-power/stats", "/rawdev/list", "/rawdev/xstats"]}
--> /l3fwd-power/stats
{"/l3fwd-power/stats": {"empty_poll": 281625000, "full_poll": 0, \
    "busy_percent": 0}}

The existing stats tracking done by the app using the metrics
library is unaffected. This will still be used to ensure backward
compatibility.

Cc: david.hunt@intel.com

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Signed-off-by: Ciara Power <ciara.power@intel.com>
---
 examples/l3fwd-power/Makefile    |  4 +++
 examples/l3fwd-power/main.c      | 57 ++++++++++++++++++++++++--------
 examples/l3fwd-power/meson.build |  4 +++
 3 files changed, 51 insertions(+), 14 deletions(-)

diff --git a/examples/l3fwd-power/Makefile b/examples/l3fwd-power/Makefile
index 729d49639b..531a1d81cb 100644
--- a/examples/l3fwd-power/Makefile
+++ b/examples/l3fwd-power/Makefile
@@ -68,6 +68,10 @@ ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y)
 CFLAGS_main.o += -Wno-return-type
 endif
 
+ifeq ($(CONFIG_RTE_LIBRTE_TELEMETRY),y)
+LDLIBS += -lrte_telemetry
+endif
+
 include $(RTE_SDK)/mk/rte.extapp.mk
 endif
 endif
diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c
index c7fe0ec034..1435458b49 100644
--- a/examples/l3fwd-power/main.c
+++ b/examples/l3fwd-power/main.c
@@ -46,6 +46,9 @@
 #include <rte_spinlock.h>
 #include <rte_power_empty_poll.h>
 #include <rte_metrics.h>
+#ifdef RTE_LIBRTE_TELEMETRY
+#include <rte_telemetry.h>
+#endif
 
 #include "perf_core.h"
 #include "main.h"
@@ -131,7 +134,7 @@
 #define EMPTY_POLL_MED_THRESHOLD 350000UL
 #define EMPTY_POLL_HGH_THRESHOLD 580000UL
 
-
+#define NUM_TELSTATS RTE_DIM(telstats_strings)
 
 static uint16_t nb_rxd = RTE_TEST_RX_DESC_DEFAULT;
 static uint16_t nb_txd = RTE_TEST_TX_DESC_DEFAULT;
@@ -2079,14 +2082,11 @@ init_power_library(void)
 	return ret;
 }
 static void
-update_telemetry(__attribute__((unused)) struct rte_timer *tim,
-		__attribute__((unused)) void *arg)
+get_current_stat_values(uint64_t *values)
 {
 	unsigned int lcore_id = rte_lcore_id();
 	struct lcore_conf *qconf;
 	uint64_t app_eps = 0, app_fps = 0, app_br = 0;
-	uint64_t values[3] = {0};
-	int ret;
 	uint64_t count = 0;
 
 	RTE_LCORE_FOREACH_SLAVE(lcore_id) {
@@ -2105,17 +2105,43 @@ update_telemetry(__attribute__((unused)) struct rte_timer *tim,
 		values[0] = app_eps/count;
 		values[1] = app_fps/count;
 		values[2] = app_br/count;
-	} else {
-		values[0] = 0;
-		values[1] = 0;
-		values[2] = 0;
-	}
+	} else
+		memset(values, 0, sizeof(uint64_t) * NUM_TELSTATS);
+
+}
+
+static void
+update_telemetry(__attribute__((unused)) struct rte_timer *tim,
+		__attribute__((unused)) void *arg)
+{
+	int ret;
+	uint64_t values[3] = {0};
 
+	get_current_stat_values(values);
 	ret = rte_metrics_update_values(RTE_METRICS_GLOBAL, telstats_index,
 					values, RTE_DIM(values));
 	if (ret < 0)
 		RTE_LOG(WARNING, POWER, "failed to update metrcis\n");
 }
+#ifdef RTE_LIBRTE_TELEMETRY
+static int
+handle_app_stats(const char *cmd __rte_unused,
+		const char *params __rte_unused,
+		char *buffer, int buf_len)
+{
+	int used = 0;
+	uint64_t values[3] = {0};
+	uint32_t i;
+
+	used = rte_tel_json_empty_obj(buffer, buf_len, used);
+	get_current_stat_values(values);
+	for (i = 0; i < NUM_TELSTATS; i++)
+		used = rte_tel_json_add_obj_u64(buffer, buf_len, used,
+				telstats_strings[i].name, values[i]);
+
+	return used;
+}
+#endif
 static void
 telemetry_setup_timer(void)
 {
@@ -2203,8 +2229,7 @@ main(int argc, char **argv)
 	uint32_t dev_rxq_num, dev_txq_num;
 	uint8_t nb_rx_queue, queue, socketid;
 	uint16_t portid;
-	uint8_t num_telstats = RTE_DIM(telstats_strings);
-	const char *ptr_strings[num_telstats];
+	const char *ptr_strings[NUM_TELSTATS];
 
 	/* catch SIGINT and restore cpufreq governor to ondemand */
 	signal(SIGINT, signal_exit_now);
@@ -2503,10 +2528,10 @@ main(int argc, char **argv)
 		/* Init metrics library */
 		rte_metrics_init(rte_socket_id());
 		/** Register stats with metrics library */
-		for (i = 0; i < num_telstats; i++)
+		for (i = 0; i < NUM_TELSTATS; i++)
 			ptr_strings[i] = telstats_strings[i].name;
 
-		ret = rte_metrics_reg_names(ptr_strings, num_telstats);
+		ret = rte_metrics_reg_names(ptr_strings, NUM_TELSTATS);
 		if (ret >= 0)
 			telstats_index = ret;
 		else
@@ -2516,6 +2541,10 @@ main(int argc, char **argv)
 			rte_spinlock_init(&stats[lcore_id].telemetry_lock);
 		}
 		rte_timer_init(&telemetry_timer);
+#ifdef RTE_LIBRTE_TELEMETRY
+		rte_telemetry_register_cmd("/l3fwd-power/stats",
+				handle_app_stats);
+#endif
 		rte_eal_mp_remote_launch(main_telemetry_loop, NULL,
 						SKIP_MASTER);
 	}
diff --git a/examples/l3fwd-power/meson.build b/examples/l3fwd-power/meson.build
index d5a3d4bb2f..e7c6be6477 100644
--- a/examples/l3fwd-power/meson.build
+++ b/examples/l3fwd-power/meson.build
@@ -16,3 +16,7 @@ deps += ['power', 'timer', 'lpm', 'hash', 'metrics']
 sources = files(
 	'main.c', 'perf_core.c'
 )
+
+if dpdk_conf.has('RTE_LIBRTE_TELEMETRY')
+	deps += ['telemetry']
+endif
-- 
2.17.1