[dpdk-dev] [PATCH v3 4/7] l3fwd-power: add support for requesting legacy mode

[Anatoly Burakov <anatoly.burakov@intel.com>]

Currently, legacy mode is the implicit default, but it is not possible
to directly request using legacy mode. Add the argument to enable
requesting legacy mode, and also make it the default.

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 examples/l3fwd-power/main.c | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c
index c70611bb7f..c02b0a3574 100644
--- a/examples/l3fwd-power/main.c
+++ b/examples/l3fwd-power/main.c
@@ -195,7 +195,8 @@ static int parse_ptype; /**< Parse packet type using rx callback, and */
 			/**< disabled by default */
 
 enum appmode {
-	APP_MODE_LEGACY = 0,
+	APP_MODE_DEFAULT = 0,
+	APP_MODE_LEGACY,
 	APP_MODE_EMPTY_POLL,
 	APP_MODE_TELEMETRY
 };
@@ -1435,6 +1436,7 @@ print_usage(const char *prgname)
 		"  --enable-jumbo: enable jumbo frame"
 		" which max packet len is PKTLEN in decimal (64-9600)\n"
 		"  --parse-ptype: parse packet type by software\n"
+		"  --legacy: use legacy interrupt-based scaling\n"
 		"  --empty-poll: enable empty poll detection"
 		" follow (training_flag, high_threshold, med_threshold)\n"
 		" --telemetry: enable telemetry mode, to update"
@@ -1581,6 +1583,7 @@ parse_ep_config(const char *q_arg)
 
 }
 #define CMD_LINE_OPT_PARSE_PTYPE "parse-ptype"
+#define CMD_LINE_OPT_LEGACY "legacy"
 #define CMD_LINE_OPT_EMPTY_POLL "empty-poll"
 #define CMD_LINE_OPT_TELEMETRY "telemetry"
 
@@ -1601,6 +1604,7 @@ parse_args(int argc, char **argv)
 		{"enable-jumbo", 0, 0, 0},
 		{CMD_LINE_OPT_EMPTY_POLL, 1, 0, 0},
 		{CMD_LINE_OPT_PARSE_PTYPE, 0, 0, 0},
+		{CMD_LINE_OPT_LEGACY, 0, 0, 0},
 		{CMD_LINE_OPT_TELEMETRY, 0, 0, 0},
 		{NULL, 0, 0, 0}
 	};
@@ -1673,10 +1677,21 @@ parse_args(int argc, char **argv)
 				numa_on = 0;
 			}
 
+			if (!strncmp(lgopts[option_index].name,
+					CMD_LINE_OPT_LEGACY,
+					sizeof(CMD_LINE_OPT_LEGACY))) {
+				if (app_mode != APP_MODE_DEFAULT) {
+					printf(" legacy mode is mutually exclusive with other modes\n");
+					return -1;
+				}
+				app_mode = APP_MODE_LEGACY;
+				printf("legacy mode is enabled\n");
+			}
+
 			if (!strncmp(lgopts[option_index].name,
 					CMD_LINE_OPT_EMPTY_POLL, 10)) {
-				if (app_mode == APP_MODE_TELEMETRY) {
-					printf(" empty-poll cannot be enabled as telemetry mode is enabled\n");
+				if (app_mode != APP_MODE_DEFAULT) {
+					printf(" empty-poll mode is mutually exclusive with other modes\n");
 					return -1;
 				}
 				app_mode = APP_MODE_EMPTY_POLL;
@@ -1693,8 +1708,8 @@ parse_args(int argc, char **argv)
 			if (!strncmp(lgopts[option_index].name,
 					CMD_LINE_OPT_TELEMETRY,
 					sizeof(CMD_LINE_OPT_TELEMETRY))) {
-				if (app_mode == APP_MODE_EMPTY_POLL) {
-					printf("telemetry mode cannot be enabled as empty poll mode is enabled\n");
+				if (app_mode != APP_MODE_DEFAULT) {
+					printf(" telemetry mode is mutually exclusive with other modes\n");
 					return -1;
 				}
 				app_mode = APP_MODE_TELEMETRY;
@@ -2254,6 +2269,9 @@ main(int argc, char **argv)
 	if (ret < 0)
 		rte_exit(EXIT_FAILURE, "Invalid L3FWD parameters\n");
 
+	if (app_mode == APP_MODE_DEFAULT)
+		app_mode = APP_MODE_LEGACY;
+
 	/* only legacy and empty poll mode rely on power library */
 	if ((app_mode == APP_MODE_LEGACY || app_mode == APP_MODE_EMPTY_POLL) &&
 			init_power_library())
-- 
2.17.1