[dpdk-dev] [PATCH 5/7] examples/qos_sched: enhance getopt_long usage

[Ibtisam Tariq <ibtisam.tariq@emumba.com>]

Instead of using getopt_long return value, strcmp was used to
compare the input parameters with the struct option array. This
patch get rid of all those strcmp by directly binding each longopt
with an int enum. This is to improve readability and consistency in
all examples.

Bugzilla ID: 238
Cc: stephen@networkplumber.org

Reported-by: David Marchand <david.marchand@redhat.com>
Signed-off-by: Ibtisam Tariq <ibtisam.tariq@emumba.com>
---
v3:
* Remove str_is function.

v2:
* Remove extra indentations.
* Remove extra block brackets in switch statement.
* Change enum names to start with OPT_ and remove KEYWORD from enum names.

v1:
* enhance getopt_long usage.
---
 examples/qos_sched/args.c | 149 +++++++++++++++++++++-----------------
 1 file changed, 83 insertions(+), 66 deletions(-)

diff --git a/examples/qos_sched/args.c b/examples/qos_sched/args.c
index c369ba9b4..10ca7bea6 100644
--- a/examples/qos_sched/args.c
+++ b/examples/qos_sched/args.c
@@ -81,10 +81,6 @@ app_usage(const char *prgname)
 		);
 }
 
-static inline int str_is(const char *str, const char *is)
-{
-	return strcmp(str, is) == 0;
-}
 
 /* returns core mask used by DPDK */
 static uint64_t
@@ -297,6 +293,25 @@ app_parse_burst_conf(const char *conf_str)
 	return 0;
 }
 
+enum {
+#define OPT_PFC "pfc"
+	OPT_PFC_NUM = 256,
+#define OPT_MNC "mnc"
+	OPT_MNC_NUM,
+#define OPT_RSZ "rsz"
+	OPT_RSZ_NUM,
+#define OPT_BSZ "bsz"
+	OPT_BSZ_NUM,
+#define OPT_MSZ "msz"
+	OPT_MSZ_NUM,
+#define OPT_RTH "rth"
+	OPT_RTH_NUM,
+#define OPT_TTH "tth"
+	OPT_TTH_NUM,
+#define OPT_CFG "cfg"
+	OPT_CFG_NUM,
+};
+
 /*
  * Parses the argument given in the command line of the application,
  * calculates mask for used cores and initializes EAL with calculated core mask
@@ -306,20 +321,19 @@ app_parse_args(int argc, char **argv)
 {
 	int opt, ret;
 	int option_index;
-	const char *optname;
 	char *prgname = argv[0];
 	uint32_t i, nb_lcores;
 
 	static struct option lgopts[] = {
-		{ "pfc", 1, 0, 0 },
-		{ "mnc", 1, 0, 0 },
-		{ "rsz", 1, 0, 0 },
-		{ "bsz", 1, 0, 0 },
-		{ "msz", 1, 0, 0 },
-		{ "rth", 1, 0, 0 },
-		{ "tth", 1, 0, 0 },
-		{ "cfg", 1, 0, 0 },
-		{ NULL,  0, 0, 0 }
+		{OPT_PFC, 1, NULL, OPT_PFC_NUM},
+		{OPT_MNC, 1, NULL, OPT_MNC_NUM},
+		{OPT_RSZ, 1, NULL, OPT_RSZ_NUM},
+		{OPT_BSZ, 1, NULL, OPT_BSZ_NUM},
+		{OPT_MSZ, 1, NULL, OPT_MSZ_NUM},
+		{OPT_RTH, 1, NULL, OPT_RTH_NUM},
+		{OPT_TTH, 1, NULL, OPT_TTH_NUM},
+		{OPT_CFG, 1, NULL, OPT_CFG_NUM},
+		{NULL,    0, 0,    0          }
 	};
 
 	/* initialize EAL first */
@@ -342,66 +356,69 @@ app_parse_args(int argc, char **argv)
 				interactive = 1;
 				break;
 			/* long options */
-			case 0:
-				optname = lgopts[option_index].name;
-				if (str_is(optname, "pfc")) {
-					ret = app_parse_flow_conf(optarg);
-					if (ret) {
-						RTE_LOG(ERR, APP, "Invalid pipe configuration %s\n", optarg);
-						return -1;
-					}
-					break;
-				}
-				if (str_is(optname, "mnc")) {
-					app_main_core = (uint32_t)atoi(optarg);
-					break;
-				}
-				if (str_is(optname, "rsz")) {
-					ret = app_parse_ring_conf(optarg);
-					if (ret) {
-						RTE_LOG(ERR, APP, "Invalid ring configuration %s\n", optarg);
-						return -1;
-					}
-					break;
+
+			case OPT_PFC_NUM:
+				ret = app_parse_flow_conf(optarg);
+				if (ret) {
+					RTE_LOG(ERR, APP, "Invalid pipe configuration %s\n",
+							optarg);
+					return -1;
 				}
-				if (str_is(optname, "bsz")) {
-					ret = app_parse_burst_conf(optarg);
-					if (ret) {
-						RTE_LOG(ERR, APP, "Invalid burst configuration %s\n", optarg);
-						return -1;
-					}
-					break;
+				break;
+
+			case OPT_MNC_NUM:
+				app_main_core = (uint32_t)atoi(optarg);
+				break;
+
+			case OPT_RSZ_NUM:
+				ret = app_parse_ring_conf(optarg);
+				if (ret) {
+					RTE_LOG(ERR, APP, "Invalid ring configuration %s\n",
+							optarg);
+					return -1;
 				}
-				if (str_is(optname, "msz")) {
-					mp_size = atoi(optarg);
-					if (mp_size <= 0) {
-						RTE_LOG(ERR, APP, "Invalid mempool size %s\n", optarg);
-						return -1;
-					}
-					break;
+				break;
+
+			case OPT_BSZ_NUM:
+				ret = app_parse_burst_conf(optarg);
+				if (ret) {
+					RTE_LOG(ERR, APP, "Invalid burst configuration %s\n",
+							optarg);
+					return -1;
 				}
-				if (str_is(optname, "rth")) {
-					ret = app_parse_rth_conf(optarg);
-					if (ret) {
-						RTE_LOG(ERR, APP, "Invalid RX threshold configuration %s\n", optarg);
-						return -1;
-					}
-					break;
+				break;
+
+			case OPT_MSZ_NUM:
+				mp_size = atoi(optarg);
+				if (mp_size <= 0) {
+					RTE_LOG(ERR, APP, "Invalid mempool size %s\n",
+							optarg);
+					return -1;
 				}
-				if (str_is(optname, "tth")) {
-					ret = app_parse_tth_conf(optarg);
-					if (ret) {
-						RTE_LOG(ERR, APP, "Invalid TX threshold configuration %s\n", optarg);
-						return -1;
-					}
-					break;
+				break;
+
+			case OPT_RTH_NUM:
+				ret = app_parse_rth_conf(optarg);
+				if (ret) {
+					RTE_LOG(ERR, APP, "Invalid RX threshold configuration %s\n",
+							optarg);
+					return -1;
 				}
-				if (str_is(optname, "cfg")) {
-					cfg_profile = optarg;
-					break;
+				break;
+
+			case OPT_TTH_NUM:
+				ret = app_parse_tth_conf(optarg);
+				if (ret) {
+					RTE_LOG(ERR, APP, "Invalid TX threshold configuration %s\n",
+							optarg);
+					return -1;
 				}
 				break;
 
+			case OPT_CFG_NUM:
+				cfg_profile = optarg;
+				break;
+
 			default:
 				app_usage(prgname);
 				return -1;
-- 
2.17.1