examples/l3fwd-power: select default mode automatically

[dpdk.git] / examples / l3fwd-power / main.c

diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c
index 51acbfd..6a4a279 100644 (file)
--- a/examples/l3fwd-power/main.c
+++ b/examples/l3fwd-power/main.c
@@ -2412,6 +2412,42 @@ launch_timer(unsigned int lcore_id)
        return 0;
 }
 
+static int
+autodetect_mode(void)
+{
+       RTE_LOG(NOTICE, L3FWD_POWER, "Operating mode not specified, probing frequency scaling support...\n");
+
+       /*
+        * Empty poll and telemetry modes have to be specifically requested to
+        * be enabled, but we can auto-detect between interrupt mode with or
+        * without frequency scaling. Both ACPI and pstate can be used.
+        */
+       if (rte_power_check_env_supported(PM_ENV_ACPI_CPUFREQ))
+               return APP_MODE_LEGACY;
+       if (rte_power_check_env_supported(PM_ENV_PSTATE_CPUFREQ))
+               return APP_MODE_LEGACY;
+
+       RTE_LOG(NOTICE, L3FWD_POWER, "Frequency scaling not supported, selecting interrupt-only mode\n");
+
+       return APP_MODE_INTERRUPT;
+}
+
+static const char *
+mode_to_str(enum appmode mode)
+{
+       switch (mode) {
+       case APP_MODE_LEGACY:
+               return "legacy";
+       case APP_MODE_EMPTY_POLL:
+               return "empty poll";
+       case APP_MODE_TELEMETRY:
+               return "telemetry";
+       case APP_MODE_INTERRUPT:
+               return "interrupt-only";
+       default:
+               return "invalid";
+       }
+}
 
 int
 main(int argc, char **argv)
@@ -2449,7 +2485,10 @@ main(int argc, char **argv)
                rte_exit(EXIT_FAILURE, "Invalid L3FWD parameters\n");
 
        if (app_mode == APP_MODE_DEFAULT)
-               app_mode = APP_MODE_LEGACY;
+               app_mode = autodetect_mode();
+
+       RTE_LOG(INFO, L3FWD_POWER, "Selected operation mode: %s\n",
+                       mode_to_str(app_mode));
 
        /* only legacy and empty poll mode rely on power library */
        if ((app_mode == APP_MODE_LEGACY || app_mode == APP_MODE_EMPTY_POLL) &&