[v2,1/2] l3fwd-power: exit if initializing power library failed

  Currently, if power library initialization fails, only a log message is
displayed. This is suboptimal for a number of reasons, but the main one
is that telemetry mode does not depend on the power library and can
therefore run in environments where l3fwd-power would normally not run
correctly (such as inside a VM). This will lead to attempts to
deinitialize the power library on exit, with a subsequent forced unclean
shutdown of DPDK.

Fix this by only initializing the power library in modes that actually
need it, and change a log message to a failure to initialize.

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 | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)
  

Tested-by:  Xie,WeiX < weix.xie@intel.com>

Regards,
Xie Wei


-----Original Message-----
From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Anatoly Burakov
Sent: Tuesday, April 21, 2020 1:57 AM
To: dev@dpdk.org
Cc: Hunt, David <david.hunt@intel.com>; Pattan, Reshma <reshma.pattan@intel.com>
Subject: [dpdk-dev] [PATCH v2 1/2] l3fwd-power: exit if initializing power library failed

Currently, if power library initialization fails, only a log message is displayed. This is suboptimal for a number of reasons, but the main one is that telemetry mode does not depend on the power library and can therefore run in environments where l3fwd-power would normally not run correctly (such as inside a VM). This will lead to attempts to deinitialize the power library on exit, with a subsequent forced unclean shutdown of DPDK.

Fix this by only initializing the power library in modes that actually need it, and change a log message to a failure to initialize.

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 | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c index b46aa7bac..be50ec049 100644
--- a/examples/l3fwd-power/main.c
+++ b/examples/l3fwd-power/main.c
@@ -2065,15 +2065,17 @@ static int check_ptype(uint16_t portid)  static int
 init_power_library(void)
 {
-	int ret = 0, lcore_id;
-	for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
-		if (rte_lcore_is_enabled(lcore_id)) {
-			/* init power management library */
-			ret = rte_power_init(lcore_id);
-			if (ret)
-				RTE_LOG(ERR, POWER,
+	unsigned int lcore_id;
+	int ret = 0;
+
+	RTE_LCORE_FOREACH(lcore_id) {
+		/* init power management library */
+		ret = rte_power_init(lcore_id);
+		if (ret) {
+			RTE_LOG(ERR, POWER,
 				"Library initialization failed on core %u\n",
 				lcore_id);
+			return ret;
 		}
 	}
 	return ret;
@@ -2224,8 +2226,8 @@ main(int argc, char **argv)
 	if (ret < 0)
 		rte_exit(EXIT_FAILURE, "Invalid L3FWD parameters\n");
 
-	if (init_power_library())
-		RTE_LOG(ERR, L3FWD_POWER, "init_power_library failed\n");
+	if (app_mode != APP_MODE_TELEMETRY && init_power_library())
+		rte_exit(EXIT_FAILURE, "init_power_library failed\n");
 
 	if (update_lcore_params() < 0)
 		rte_exit(EXIT_FAILURE, "update_lcore_params failed\n");
--
2.17.1