[dpdk-dev] [PATCH 2/7] examples/l3fwd-acl: 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: konstantin.ananyev@intel.com

Reported-by: David Marchand <david.marchand@redhat.com>
Signed-off-by: Ibtisam Tariq <ibtisam.tariq@emumba.com>
---
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/l3fwd-acl/main.c | 219 +++++++++++++++++++-------------------
 1 file changed, 110 insertions(+), 109 deletions(-)

diff --git a/examples/l3fwd-acl/main.c b/examples/l3fwd-acl/main.c
index 961594f5f..5725963ad 100644
--- a/examples/l3fwd-acl/main.c
+++ b/examples/l3fwd-acl/main.c
@@ -195,13 +195,24 @@ send_single_packet(struct rte_mbuf *m, uint16_t port);
 #define ACL_LEAD_CHAR		('@')
 #define ROUTE_LEAD_CHAR		('R')
 #define COMMENT_LEAD_CHAR	('#')
-#define OPTION_CONFIG		"config"
-#define OPTION_NONUMA		"no-numa"
-#define OPTION_ENBJMO		"enable-jumbo"
-#define OPTION_RULE_IPV4	"rule_ipv4"
-#define OPTION_RULE_IPV6	"rule_ipv6"
-#define OPTION_ALG		"alg"
-#define OPTION_ETH_DEST		"eth-dest"
+
+enum {
+#define OPT_CONFIG		"config"
+	OPT_CONFIG_NUM = 256,
+#define OPT_NONUMA		"no-numa"
+	OPT_NONUMA_NUM,
+#define OPT_ENBJMO		"enable-jumbo"
+	OPT_ENBJMO_NUM,
+#define OPT_RULE_IPV4	"rule_ipv4"
+	OPT_RULE_IPV4_NUM,
+#define OPT_RULE_IPV6	"rule_ipv6"
+	OPT_RULE_IPV6_NUM,
+#define OPT_ALG		    "alg"
+	OPT_ALG_NUM,
+#define OPT_ETH_DEST    "eth-dest"
+	OPT_ETH_DEST_NUM,
+};
+
 #define ACL_DENY_SIGNATURE	0xf0000000
 #define RTE_LOGTYPE_L3FWDACL	RTE_LOGTYPE_USER3
 #define acl_log(format, ...)	RTE_LOG(ERR, L3FWDACL, format, ##__VA_ARGS__)
@@ -1177,9 +1188,9 @@ static void
 dump_acl_config(void)
 {
 	printf("ACL option are:\n");
-	printf(OPTION_RULE_IPV4": %s\n", parm_config.rule_ipv4_name);
-	printf(OPTION_RULE_IPV6": %s\n", parm_config.rule_ipv6_name);
-	printf(OPTION_ALG": %s\n", str_acl_alg(parm_config.alg));
+	printf(OPT_RULE_IPV4": %s\n", parm_config.rule_ipv4_name);
+	printf(OPT_RULE_IPV6": %s\n", parm_config.rule_ipv6_name);
+	printf(OPT_ALG": %s\n", str_acl_alg(parm_config.alg));
 }
 
 static int
@@ -1608,27 +1619,27 @@ print_usage(const char *prgname)
 
 	usage_acl_alg(alg, sizeof(alg));
 	printf("%s [EAL options] -- -p PORTMASK -P"
-		"--"OPTION_RULE_IPV4"=FILE"
-		"--"OPTION_RULE_IPV6"=FILE"
-		"  [--"OPTION_CONFIG" (port,queue,lcore)[,(port,queue,lcore]]"
-		"  [--"OPTION_ENBJMO" [--max-pkt-len PKTLEN]]\n"
+		"--"OPT_RULE_IPV4"=FILE"
+		"--"OPT_RULE_IPV6"=FILE"
+		"  [--"OPT_CONFIG" (port,queue,lcore)[,(port,queue,lcore]]"
+		"  [--"OPT_ENBJMO" [--max-pkt-len PKTLEN]]\n"
 		"  -p PORTMASK: hexadecimal bitmask of ports to configure\n"
 		"  -P : enable promiscuous mode\n"
-		"  --"OPTION_CONFIG": (port,queue,lcore): "
+		"  --"OPT_CONFIG": (port,queue,lcore): "
 		"rx queues configuration\n"
-		"  --"OPTION_NONUMA": optional, disable numa awareness\n"
-		"  --"OPTION_ENBJMO": enable jumbo frame"
+		"  --"OPT_NONUMA": optional, disable numa awareness\n"
+		"  --"OPT_ENBJMO": enable jumbo frame"
 		" which max packet len is PKTLEN in decimal (64-9600)\n"
-		"  --"OPTION_RULE_IPV4"=FILE: specify the ipv4 rules entries "
+		"  --"OPT_RULE_IPV4"=FILE: specify the ipv4 rules entries "
 		"file. "
 		"Each rule occupy one line. "
 		"2 kinds of rules are supported. "
 		"One is ACL entry at while line leads with character '%c', "
 		"another is route entry at while line leads with "
 		"character '%c'.\n"
-		"  --"OPTION_RULE_IPV6"=FILE: specify the ipv6 rules "
+		"  --"OPT_RULE_IPV6"=FILE: specify the ipv6 rules "
 		"entries file.\n"
-		"  --"OPTION_ALG": ACL classify method to use, one of: %s\n",
+		"  --"OPT_ALG": ACL classify method to use, one of: %s\n",
 		prgname, ACL_LEAD_CHAR, ROUTE_LEAD_CHAR, alg);
 }
 
@@ -1747,14 +1758,14 @@ parse_args(int argc, char **argv)
 	int option_index;
 	char *prgname = argv[0];
 	static struct option lgopts[] = {
-		{OPTION_CONFIG, 1, 0, 0},
-		{OPTION_NONUMA, 0, 0, 0},
-		{OPTION_ENBJMO, 0, 0, 0},
-		{OPTION_RULE_IPV4, 1, 0, 0},
-		{OPTION_RULE_IPV6, 1, 0, 0},
-		{OPTION_ALG, 1, 0, 0},
-		{OPTION_ETH_DEST, 1, 0, 0},
-		{NULL, 0, 0, 0}
+		{OPT_CONFIG,    1, NULL, OPT_CONFIG_NUM    },
+		{OPT_NONUMA,    0, NULL, OPT_NONUMA_NUM    },
+		{OPT_ENBJMO,    0, NULL, OPT_ENBJMO_NUM    },
+		{OPT_RULE_IPV4, 1, NULL, OPT_RULE_IPV4_NUM },
+		{OPT_RULE_IPV6, 1, NULL, OPT_RULE_IPV6_NUM },
+		{OPT_ALG,       1, NULL, OPT_ALG_NUM       },
+		{OPT_ETH_DEST,  1, NULL, OPT_ETH_DEST_NUM  },
+		{NULL,          0, 0,    0                 }
 	};
 
 	argvopt = argv;
@@ -1772,104 +1783,94 @@ parse_args(int argc, char **argv)
 				return -1;
 			}
 			break;
+
 		case 'P':
 			printf("Promiscuous mode selected\n");
 			promiscuous_on = 1;
 			break;
 
 		/* long options */
-		case 0:
-			if (!strncmp(lgopts[option_index].name,
-					OPTION_CONFIG,
-					sizeof(OPTION_CONFIG))) {
-				ret = parse_config(optarg);
-				if (ret) {
-					printf("invalid config\n");
-					print_usage(prgname);
-					return -1;
-				}
-			}
-
-			if (!strncmp(lgopts[option_index].name,
-					OPTION_NONUMA,
-					sizeof(OPTION_NONUMA))) {
-				printf("numa is disabled\n");
-				numa_on = 0;
-			}
-
-			if (!strncmp(lgopts[option_index].name,
-					OPTION_ENBJMO, sizeof(OPTION_ENBJMO))) {
-				struct option lenopts = {
-					"max-pkt-len",
-					required_argument,
-					0,
-					0
-				};
-
-				printf("jumbo frame is enabled\n");
-				port_conf.rxmode.offloads |=
-						DEV_RX_OFFLOAD_JUMBO_FRAME;
-				port_conf.txmode.offloads |=
-						DEV_TX_OFFLOAD_MULTI_SEGS;
-
-				/*
-				 * if no max-pkt-len set, then use the
-				 * default value RTE_ETHER_MAX_LEN
-				 */
-				if (0 == getopt_long(argc, argvopt, "",
-						&lenopts, &option_index)) {
-					ret = parse_max_pkt_len(optarg);
-					if ((ret < 64) ||
-						(ret > MAX_JUMBO_PKT_LEN)) {
-						printf("invalid packet "
-							"length\n");
-						print_usage(prgname);
-						return -1;
-					}
-					port_conf.rxmode.max_rx_pkt_len = ret;
-				}
-				printf("set jumbo frame max packet length "
-					"to %u\n",
-					(unsigned int)
-					port_conf.rxmode.max_rx_pkt_len);
+		case OPT_CONFIG_NUM:
+			ret = parse_config(optarg);
+			if (ret) {
+				printf("invalid config\n");
+				print_usage(prgname);
+				return -1;
 			}
+			break;
 
-			if (!strncmp(lgopts[option_index].name,
-					OPTION_RULE_IPV4,
-					sizeof(OPTION_RULE_IPV4)))
-				parm_config.rule_ipv4_name = optarg;
-
-			if (!strncmp(lgopts[option_index].name,
-					OPTION_RULE_IPV6,
-					sizeof(OPTION_RULE_IPV6))) {
-				parm_config.rule_ipv6_name = optarg;
-			}
+		case OPT_NONUMA_NUM:
+			printf("numa is disabled\n");
+			numa_on = 0;
+			break;
 
-			if (!strncmp(lgopts[option_index].name,
-					OPTION_ALG, sizeof(OPTION_ALG))) {
-				parm_config.alg = parse_acl_alg(optarg);
-				if (parm_config.alg ==
-						RTE_ACL_CLASSIFY_DEFAULT) {
-					printf("unknown %s value:\"%s\"\n",
-						OPTION_ALG, optarg);
+		case OPT_ENBJMO_NUM:
+		{
+			struct option lenopts = {
+				"max-pkt-len",
+				required_argument,
+				0,
+				0
+			};
+
+			printf("jumbo frame is enabled\n");
+			port_conf.rxmode.offloads |=
+					DEV_RX_OFFLOAD_JUMBO_FRAME;
+			port_conf.txmode.offloads |=
+					DEV_TX_OFFLOAD_MULTI_SEGS;
+
+			/*
+			 * if no max-pkt-len set, then use the
+			 * default value RTE_ETHER_MAX_LEN
+			 */
+			if (0 == getopt_long(argc, argvopt, "",
+					&lenopts, &option_index)) {
+				ret = parse_max_pkt_len(optarg);
+				if ((ret < 64) ||
+					(ret > MAX_JUMBO_PKT_LEN)) {
+					printf("invalid packet "
+						"length\n");
 					print_usage(prgname);
 					return -1;
 				}
+				port_conf.rxmode.max_rx_pkt_len = ret;
 			}
+			printf("set jumbo frame max packet length "
+				"to %u\n",
+				(unsigned int)
+				port_conf.rxmode.max_rx_pkt_len);
+			break;
+		}
+		case OPT_RULE_IPV4_NUM:
+			parm_config.rule_ipv4_name = optarg;
+			break;
 
-			if (!strncmp(lgopts[option_index].name, OPTION_ETH_DEST,
-					sizeof(OPTION_ETH_DEST))) {
-				const char *serr = parse_eth_dest(optarg);
-				if (serr != NULL) {
-					printf("invalid %s value:\"%s\": %s\n",
-						OPTION_ETH_DEST, optarg, serr);
-					print_usage(prgname);
-					return -1;
-				}
-			}
+		case OPT_RULE_IPV6_NUM:
+			parm_config.rule_ipv6_name = optarg;
+			break;
 
+		case OPT_ALG_NUM:
+			parm_config.alg = parse_acl_alg(optarg);
+			if (parm_config.alg ==
+					RTE_ACL_CLASSIFY_DEFAULT) {
+				printf("unknown %s value:\"%s\"\n",
+					OPT_ALG, optarg);
+				print_usage(prgname);
+				return -1;
+			}
 			break;
 
+		case OPT_ETH_DEST_NUM:
+		{
+			const char *serr = parse_eth_dest(optarg);
+			if (serr != NULL) {
+				printf("invalid %s value:\"%s\": %s\n",
+					OPT_ETH_DEST, optarg, serr);
+				print_usage(prgname);
+				return -1;
+			}
+			break;
+		}
 		default:
 			print_usage(prgname);
 			return -1;
-- 
2.17.1