[PATCH v2] app/testpmd: add bitrate stats option

[Pablo de Lara <pablo.de.lara.guarch@intel.com>]

From: Remy Horton <remy.horton@intel.com>

Bit-rate collation should only be done by one core. This patch adds
an option to select which core performs the bit-rate calculation,
which is also disabled by default.

Fixes: 7e4441c8efb9 ("app/testpmd: add bitrate statistics calculation")

Signed-off-by: Remy Horton <remy.horton@intel.com>
Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
---

Changes in v2:
- Added parameter to documentation

 app/test-pmd/parameters.c             | 19 +++++++++++++++++-
 app/test-pmd/testpmd.c                | 36 +++++++++++++++++++++++++----------
 app/test-pmd/testpmd.h                |  5 +++++
 doc/guides/testpmd_app_ug/run_app.rst |  4 ++++
 4 files changed, 53 insertions(+), 11 deletions(-)

diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c
index 3f4d3a2..a0300eb 100644
--- a/app/test-pmd/parameters.c
+++ b/app/test-pmd/parameters.c
@@ -201,7 +201,9 @@ usage(char* progname)
 	printf("  --disable-link-check: disable check on link status when "
 	       "starting/stopping ports.\n");
 	printf("  --no-lsc-interrupt: disable link status change interrupt.\n");
-	printf("  --no-rmv-interrupt: disable device removal interrupt.");
+	printf("  --no-rmv-interrupt: disable device removal interrupt.\n");
+	printf("  --bitrate-stats=N: set the logical core N to perform "
+		"bit-rate calculation.\n");
 }
 
 #ifdef RTE_LIBRTE_CMDLINE
@@ -536,6 +538,9 @@ launch_args_parse(int argc, char** argv)
 #ifdef RTE_LIBRTE_LATENCY_STATS
 		{ "latencystats",               1, 0, 0 },
 #endif
+#ifdef RTE_LIBRTE_BITRATE
+		{ "bitrate-stats",              1, 0, 0 },
+#endif
 		{ "disable-crc-strip",          0, 0, 0 },
 		{ "enable-lro",                 0, 0, 0 },
 		{ "enable-rx-cksum",            0, 0, 0 },
@@ -793,6 +798,18 @@ launch_args_parse(int argc, char** argv)
 						 " must be >= 0\n", n);
 			}
 #endif
+#ifdef RTE_LIBRTE_BITRATE
+			if (!strcmp(lgopts[opt_idx].name, "bitrate-stats")) {
+				n = atoi(optarg);
+				if (n >= 0) {
+					bitrate_lcore_id = (lcoreid_t) n;
+					bitrate_enabled = 1;
+				} else
+					rte_exit(EXIT_FAILURE,
+						 "invalid lcore id %d for bitrate stats"
+						 " must be >= 0\n", n);
+			}
+#endif
 			if (!strcmp(lgopts[opt_idx].name, "disable-crc-strip"))
 				rx_mode.hw_strip_crc = 0;
 			if (!strcmp(lgopts[opt_idx].name, "enable-lro"))
diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 3a57348..cfd5382 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -355,8 +355,12 @@ uint16_t nb_rx_queue_stats_mappings = 0;
 
 unsigned max_socket = 0;
 
+#ifdef RTE_LIBRTE_BITRATE
 /* Bitrate statistics */
 struct rte_stats_bitrates *bitrate_data;
+lcoreid_t bitrate_lcore_id;
+uint8_t bitrate_enabled;
+#endif
 
 /* Forward function declarations */
 static void map_port_queue_stats_mapping_registers(uint8_t pi, struct rte_port *port);
@@ -962,12 +966,18 @@ run_pkt_fwd_on_lcore(struct fwd_lcore *fc, packet_fwd_t pkt_fwd)
 		for (sm_id = 0; sm_id < nb_fs; sm_id++)
 			(*pkt_fwd)(fsm[sm_id]);
 #ifdef RTE_LIBRTE_BITRATE
-		tics_current = rte_rdtsc();
-		if (tics_current - tics_datum >= tics_per_1sec) {
-			/* Periodic bitrate calculation */
-			for (idx_port = 0; idx_port < cnt_ports; idx_port++)
-				rte_stats_bitrate_calc(bitrate_data, idx_port);
-			tics_datum = tics_current;
+		if (bitrate_enabled != 0 &&
+				bitrate_lcore_id == rte_lcore_id()) {
+			tics_current = rte_rdtsc();
+			if (tics_current - tics_datum >= tics_per_1sec) {
+				/* Periodic bitrate calculation */
+				for (idx_port = 0;
+						idx_port < cnt_ports;
+						idx_port++)
+					rte_stats_bitrate_calc(bitrate_data,
+						idx_port);
+				tics_datum = tics_current;
+			}
 		}
 #endif
 #ifdef RTE_LIBRTE_LATENCY_STATS
@@ -2238,6 +2248,9 @@ main(int argc, char** argv)
 		rte_panic("Empty set of forwarding logical cores - check the "
 			  "core mask supplied in the command parameters\n");
 
+	/* Bitrate stats disabled by default */
+	bitrate_enabled = 0;
+
 	argc -= diag;
 	argv += diag;
 	if (argc > 1)
@@ -2275,10 +2288,13 @@ main(int argc, char** argv)
 
 	/* Setup bitrate stats */
 #ifdef RTE_LIBRTE_BITRATE
-	bitrate_data = rte_stats_bitrate_create();
-	if (bitrate_data == NULL)
-		rte_exit(EXIT_FAILURE, "Could not allocate bitrate data.\n");
-	rte_stats_bitrate_reg(bitrate_data);
+	if (bitrate_enabled != 0) {
+		bitrate_data = rte_stats_bitrate_create();
+		if (bitrate_data == NULL)
+			rte_exit(EXIT_FAILURE,
+				"Could not allocate bitrate data.\n");
+		rte_stats_bitrate_reg(bitrate_data);
+	}
 #endif
 
 
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index a9ff07e..6443f7e 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -380,6 +380,11 @@ extern uint8_t latencystats_enabled;
 extern lcoreid_t latencystats_lcore_id;
 #endif
 
+#ifdef RTE_LIBRTE_BITRATE
+extern lcoreid_t bitrate_lcore_id;
+extern uint8_t bitrate_enabled;
+#endif
+
 extern struct rte_fdir_conf fdir_conf;
 
 /*
diff --git a/doc/guides/testpmd_app_ug/run_app.rst b/doc/guides/testpmd_app_ug/run_app.rst
index df5a0ee..b9be1e6 100644
--- a/doc/guides/testpmd_app_ug/run_app.rst
+++ b/doc/guides/testpmd_app_ug/run_app.rst
@@ -465,3 +465,7 @@ The commandline options are:
 *   ``--disable-link-check``
 
     Disable check on link status when starting/stopping ports.
+
+*  ``--bitrate-stats=N``
+
+    Set the logical core N to perform bitrate calculation.
-- 
2.7.4