examples/l3fwd-power: implement proper shutdown

Currently, shutdown for l3fwd-power application is all over the place
and may or may not happen either in the signal handler or in the main()
function. Fix this so that the signal handler will only set the exit
variable, thereby allowing all of the loops to end properly and proceed
to deinitialize everything.

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Acked-by: David Hunt <david.hunt@intel.com>
Reviewed-by: Reshma Pattan <reshma.pattan@intel.com>

examples/l3fwd-power/main.c

@@ -422,41 +422,10 @@ static int is_done(void)
 static void
 signal_exit_now(int sigtype)
 {
-	unsigned lcore_id;
-	unsigned int portid;
-	int ret;
-
-	if (sigtype == SIGINT) {
-		if (app_mode == APP_MODE_EMPTY_POLL ||
-				app_mode == APP_MODE_TELEMETRY)
-			quit_signal = true;
 
+	if (sigtype == SIGINT)
+		quit_signal = true;
 
-		for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
-			if (rte_lcore_is_enabled(lcore_id) == 0)
-				continue;
-
-			/* init power management library */
-			ret = rte_power_exit(lcore_id);
-			if (ret)
-				rte_exit(EXIT_FAILURE, "Power management "
-					"library de-initialization failed on "
-							"core%u\n", lcore_id);
-		}
-
-		if (app_mode != APP_MODE_EMPTY_POLL) {
-			RTE_ETH_FOREACH_DEV(portid) {
-				if ((enabled_port_mask & (1 << portid)) == 0)
-					continue;
-
-				rte_eth_dev_stop(portid);
-				rte_eth_dev_close(portid);
-			}
-		}
-	}
-
-	if (app_mode != APP_MODE_EMPTY_POLL)
-		rte_exit(EXIT_SUCCESS, "User forced exit\n");
 }
 
 /*  Freqency scale down timer callback */
@@ -1196,7 +1165,7 @@ main_loop(__rte_unused void *dummy)
 	else
 		RTE_LOG(INFO, L3FWD_POWER, "RX interrupt won't enable.\n");
 
-	while (1) {
+	while (!is_done()) {
 		stats[lcore_id].nb_iteration_looped++;
 
 		cur_tsc = rte_rdtsc();
@@ -1343,6 +1312,8 @@ main_loop(__rte_unused void *dummy)
 			stats[lcore_id].sleep_time += lcore_idle_hint;
 		}
 	}
+
+	return 0;
 }
 
 static int
@@ -2080,6 +2051,26 @@ init_power_library(void)
 	}
 	return ret;
 }
+
+static int
+deinit_power_library(void)
+{
+	unsigned int lcore_id;
+	int ret = 0;
+
+	RTE_LCORE_FOREACH(lcore_id) {
+		/* deinit power management library */
+		ret = rte_power_exit(lcore_id);
+		if (ret) {
+			RTE_LOG(ERR, POWER,
+				"Library deinitialization failed on core %u\n",
+				lcore_id);
+			return ret;
+		}
+	}
+	return ret;
+}
+
 static void
 update_telemetry(__rte_unused struct rte_timer *tim,
 		__rte_unused void *arg)
@@ -2530,8 +2521,23 @@ main(int argc, char **argv)
 			return -1;
 	}
 
+	RTE_ETH_FOREACH_DEV(portid)
+	{
+		if ((enabled_port_mask & (1 << portid)) == 0)
+			continue;
+
+		rte_eth_dev_stop(portid);
+		rte_eth_dev_close(portid);
+	}
+
 	if (app_mode == APP_MODE_EMPTY_POLL)
 		rte_power_empty_poll_stat_free();
 
+	if (app_mode != APP_MODE_TELEMETRY && deinit_power_library())
+		rte_exit(EXIT_FAILURE, "deinit_power_library failed\n");
+
+	if (rte_eal_cleanup() < 0)
+		RTE_LOG(ERR, L3FWD_POWER, "EAL cleanup failed\n");
+
 	return 0;
 }