[dpdk-dev] [PATCH 6/8] examples/vhost: enhance getopt_long usage

[Ibtisam Tariq]

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.

Bugzilla ID: 238
Fixes: d19533e86f ("examples/vhost: copy old vhost example")
Fixes: bde19a4d4b ("examples/vhost: rename --dev-basename to --socket-file")
Cc: jiayu.hu at intel.com
Cc: huawei.xie at intel.com

Reported-by: David Marchand <david.marchand at redhat.com>
Signed-off-by: Ibtisam Tariq <ibtisam.tariq at emumba.com>
---
 examples/vhost/main.c | 264 +++++++++++++++++++++++-------------------
 1 file changed, 143 insertions(+), 121 deletions(-)

diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index faa482245..8056cac7a 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -450,6 +450,29 @@ us_vhost_usage(const char *prgname)
 	       prgname);
 }
 
+enum {
+#define CMD_LINE_OPT_VM2VM               "vm2vm"
+	CMD_LINE_OPT_VM2VM_NUM = 256,
+#define CMD_LINE_OPT_RX_RETRY            "rx-retry"
+	CMD_LINE_OPT_RX_RETRY_NUM,
+#define CMD_LINE_OPT_RX_RETRY_DELAY      "rx-retry-delay"
+	CMD_LINE_OPT_RX_RETRY_DELAY_NUM,
+#define CMD_LINE_OPT_RX_RETRY_NUMB        "rx-retry-num"
+	CMD_LINE_OPT_RX_RETRY_NUMB_NUM,
+#define CMD_LINE_OPT_MERGEABLE           "mergeable"
+	CMD_LINE_OPT_MERGEABLE_NUM,
+#define CMD_LINE_OPT_STATS               "stats"
+	CMD_LINE_OPT_STATS_NUM,
+#define CMD_LINE_OPT_SOCKET_FILE         "socket-file"
+	CMD_LINE_OPT_SOCKET_FILE_NUM,
+#define CMD_LINE_OPT_TX_CSUM             "tx-csum"
+	CMD_LINE_OPT_TX_CSUM_NUM,
+#define CMD_LINE_OPT_TSO                 "tso"
+	CMD_LINE_OPT_TSO_NUM,
+#define CMD_LINE_OPT_CLIENT              "client"
+#define CMD_LINE_OPT_BUILTIN_NET_DRIVER  "builtin-net-driver"
+};
+
 /*
  * Parse the arguments given in the command line of the application.
  */
@@ -461,17 +484,27 @@ us_vhost_parse_args(int argc, char **argv)
 	unsigned i;
 	const char *prgname = argv[0];
 	static struct option long_option[] = {
-		{"vm2vm", required_argument, NULL, 0},
-		{"rx-retry", required_argument, NULL, 0},
-		{"rx-retry-delay", required_argument, NULL, 0},
-		{"rx-retry-num", required_argument, NULL, 0},
-		{"mergeable", required_argument, NULL, 0},
-		{"stats", required_argument, NULL, 0},
-		{"socket-file", required_argument, NULL, 0},
-		{"tx-csum", required_argument, NULL, 0},
-		{"tso", required_argument, NULL, 0},
-		{"client", no_argument, &client_mode, 1},
-		{"builtin-net-driver", no_argument, &builtin_net_driver, 1},
+		{CMD_LINE_OPT_VM2VM, required_argument,
+				NULL, CMD_LINE_OPT_VM2VM_NUM},
+		{CMD_LINE_OPT_RX_RETRY, required_argument,
+				NULL, CMD_LINE_OPT_RX_RETRY_NUM},
+		{CMD_LINE_OPT_RX_RETRY_DELAY, required_argument,
+				NULL, CMD_LINE_OPT_RX_RETRY_DELAY_NUM},
+		{CMD_LINE_OPT_RX_RETRY_NUMB, required_argument,
+				NULL, CMD_LINE_OPT_RX_RETRY_NUMB_NUM},
+		{CMD_LINE_OPT_MERGEABLE, required_argument,
+				NULL, CMD_LINE_OPT_MERGEABLE_NUM},
+		{CMD_LINE_OPT_STATS, required_argument,
+				NULL, CMD_LINE_OPT_STATS_NUM},
+		{CMD_LINE_OPT_SOCKET_FILE, required_argument,
+				NULL, CMD_LINE_OPT_SOCKET_FILE_NUM},
+		{CMD_LINE_OPT_TX_CSUM, required_argument,
+				NULL, CMD_LINE_OPT_TX_CSUM_NUM},
+		{CMD_LINE_OPT_TSO, required_argument,
+				NULL, CMD_LINE_OPT_TSO_NUM},
+		{CMD_LINE_OPT_CLIENT, no_argument, &client_mode, 1},
+		{CMD_LINE_OPT_BUILTIN_NET_DRIVER, no_argument,
+				&builtin_net_driver, 1},
 		{NULL, 0, 0, 0},
 	};
 
@@ -497,126 +530,115 @@ us_vhost_parse_args(int argc, char **argv)
 
 			break;
 
-		case 0:
-			/* Enable/disable vm2vm comms. */
-			if (!strncmp(long_option[option_index].name, "vm2vm",
-				MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, (VM2VM_LAST - 1));
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG,
-						"Invalid argument for "
-						"vm2vm [0|1|2]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else {
-					vm2vm_mode = (vm2vm_type)ret;
-				}
+		case CMD_LINE_OPT_VM2VM_NUM:
+		{
+			ret = parse_num_opt(optarg, (VM2VM_LAST - 1));
+			if (ret == -1) {
+				RTE_LOG(INFO, VHOST_CONFIG,
+					"Invalid argument for "
+					"vm2vm [0|1|2]\n");
+				us_vhost_usage(prgname);
+				return -1;
 			}
-
-			/* Enable/disable retries on RX. */
-			if (!strncmp(long_option[option_index].name, "rx-retry", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, 1);
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for rx-retry [0|1]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else {
-					enable_retry = ret;
-				}
+			vm2vm_mode = (vm2vm_type)ret;
+			break;
+		}
+		case CMD_LINE_OPT_RX_RETRY_NUM:
+		{
+			ret = parse_num_opt(optarg, 1);
+			if (ret == -1) {
+				RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for rx-retry [0|1]\n");
+				us_vhost_usage(prgname);
+				return -1;
 			}
-
-			/* Enable/disable TX checksum offload. */
-			if (!strncmp(long_option[option_index].name, "tx-csum", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, 1);
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for tx-csum [0|1]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else
-					enable_tx_csum = ret;
+			enable_retry = ret;
+			break;
+		}
+		case CMD_LINE_OPT_TX_CSUM_NUM:
+		{
+			ret = parse_num_opt(optarg, 1);
+			if (ret == -1) {
+				RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for tx-csum [0|1]\n");
+				us_vhost_usage(prgname);
+				return -1;
 			}
-
-			/* Enable/disable TSO offload. */
-			if (!strncmp(long_option[option_index].name, "tso", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, 1);
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for tso [0|1]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else
-					enable_tso = ret;
+			enable_tx_csum = ret;
+			break;
+		}
+		case CMD_LINE_OPT_TSO_NUM:
+		{
+			ret = parse_num_opt(optarg, 1);
+			if (ret == -1) {
+				RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for tso [0|1]\n");
+				us_vhost_usage(prgname);
+				return -1;
 			}
-
-			/* Specify the retries delay time (in useconds) on RX. */
-			if (!strncmp(long_option[option_index].name, "rx-retry-delay", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, INT32_MAX);
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for rx-retry-delay [0-N]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else {
-					burst_rx_delay_time = ret;
-				}
+			enable_tso = ret;
+			break;
+		}
+		case CMD_LINE_OPT_RX_RETRY_DELAY_NUM:
+		{
+			ret = parse_num_opt(optarg, INT32_MAX);
+			if (ret == -1) {
+				RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for rx-retry-delay [0-N]\n");
+				us_vhost_usage(prgname);
+				return -1;
 			}
-
-			/* Specify the retries number on RX. */
-			if (!strncmp(long_option[option_index].name, "rx-retry-num", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, INT32_MAX);
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for rx-retry-num [0-N]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else {
-					burst_rx_retry_num = ret;
-				}
+			burst_rx_delay_time = ret;
+			break;
+		}
+		case CMD_LINE_OPT_RX_RETRY_NUMB_NUM:
+		{
+			ret = parse_num_opt(optarg, INT32_MAX);
+			if (ret == -1) {
+				RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for rx-retry-num [0-N]\n");
+				us_vhost_usage(prgname);
+				return -1;
 			}
-
-			/* Enable/disable RX mergeable buffers. */
-			if (!strncmp(long_option[option_index].name, "mergeable", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, 1);
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for mergeable [0|1]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else {
-					mergeable = !!ret;
-					if (ret) {
-						vmdq_conf_default.rxmode.offloads |=
-							DEV_RX_OFFLOAD_JUMBO_FRAME;
-						vmdq_conf_default.rxmode.max_rx_pkt_len
-							= JUMBO_FRAME_MAX_SIZE;
-					}
-				}
+			burst_rx_retry_num = ret;
+			break;
+		}
+		case CMD_LINE_OPT_MERGEABLE_NUM:
+		{
+			ret = parse_num_opt(optarg, 1);
+			if (ret == -1) {
+				RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for mergeable [0|1]\n");
+				us_vhost_usage(prgname);
+				return -1;
 			}
-
-			/* Enable/disable stats. */
-			if (!strncmp(long_option[option_index].name, "stats", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, INT32_MAX);
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG,
-						"Invalid argument for stats [0..N]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else {
-					enable_stats = ret;
-				}
+			mergeable = !!ret;
+			if (ret) {
+				vmdq_conf_default.rxmode.offloads |=
+					DEV_RX_OFFLOAD_JUMBO_FRAME;
+				vmdq_conf_default.rxmode.max_rx_pkt_len
+					= JUMBO_FRAME_MAX_SIZE;
 			}
-
-			/* Set socket file path. */
-			if (!strncmp(long_option[option_index].name,
-						"socket-file", MAX_LONG_OPT_SZ)) {
-				if (us_vhost_parse_socket_path(optarg) == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG,
-					"Invalid argument for socket name (Max %d characters)\n",
-					PATH_MAX);
-					us_vhost_usage(prgname);
-					return -1;
-				}
+			break;
+		}
+		case CMD_LINE_OPT_STATS_NUM:
+		{
+			ret = parse_num_opt(optarg, INT32_MAX);
+			if (ret == -1) {
+				RTE_LOG(INFO, VHOST_CONFIG,
+					"Invalid argument for stats [0..N]\n");
+				us_vhost_usage(prgname);
+				return -1;
 			}
-
+			enable_stats = ret;
 			break;
-
-			/* Invalid option - print options. */
+		}
+		case CMD_LINE_OPT_SOCKET_FILE_NUM:
+		{
+			if (us_vhost_parse_socket_path(optarg) == -1) {
+				RTE_LOG(INFO, VHOST_CONFIG,
+				"Invalid argument for socket name (Max %d characters)\n",
+				PATH_MAX);
+				us_vhost_usage(prgname);
+				return -1;
+			}
+			break;
+		}
+		/* Invalid option - print options. */
 		default:
 			us_vhost_usage(prgname);
 			return -1;
-- 
2.17.1