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dpdk/examples/server_node_efd/server/args.c

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+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2016-2017 Intel Corporation
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <getopt.h>
+#include <stdarg.h>
+#include <errno.h>
+
+#include <rte_memory.h>
+#include <rte_string_fns.h>
+
+#include "common.h"
+#include "args.h"
+#include "init.h"
+
+/* 1M flows by default */
+#define DEFAULT_NUM_FLOWS    0x100000
+
+/* global var for number of nodes - extern in header */
+uint8_t num_nodes;
+/* global var for number of flows - extern in header */
+uint32_t num_flows = DEFAULT_NUM_FLOWS;
+
+static const char *progname;
+
+/**
+ * Prints out usage information to stdout
+ */
+static void
+usage(void)
+{
+	printf("%s [EAL options] -- -p PORTMASK -n NUM_NODES -f NUM_FLOWS\n"
+		" -p PORTMASK: hexadecimal bitmask of ports to use\n"
+		" -n NUM_NODES: number of node processes to use\n"
+		" -f NUM_FLOWS: number of flows to be added in the EFD table\n",
+		progname);
+}
+
+/**
+ * The ports to be used by the application are passed in
+ * the form of a bitmask. This function parses the bitmask
+ * and places the port numbers to be used into the port[]
+ * array variable
+ */
+static int
+parse_portmask(uint8_t max_ports, const char *portmask)
+{
+	char *end = NULL;
+	unsigned long pm;
+	uint8_t count = 0;
+
+	if (portmask == NULL || *portmask == '\0')
+		return -1;
+
+	/* convert parameter to a number and verify */
+	pm = strtoul(portmask, &end, 16);
+	if (end == NULL || *end != '\0' || pm == 0)
+		return -1;
+
+	/* loop through bits of the mask and mark ports */
+	while (pm != 0) {
+		if (pm & 0x01) { /* bit is set in mask, use port */
+			if (count >= max_ports)
+				printf("WARNING: requested port %u not present"
+				" - ignoring\n", (unsigned int)count);
+			else
+			    info->id[info->num_ports++] = count;
+		}
+		pm = (pm >> 1);
+		count++;
+	}
+
+	return 0;
+}
+
+/**
+ * Take the number of nodes parameter passed to the app
+ * and convert to a number to store in the num_nodes variable
+ */
+static int
+parse_num_nodes(const char *nodes)
+{
+	char *end = NULL;
+	unsigned long temp;
+
+	if (nodes == NULL || *nodes == '\0')
+		return -1;
+
+	temp = strtoul(nodes, &end, 10);
+	if (end == NULL || *end != '\0' || temp == 0)
+		return -1;
+
+	num_nodes = (uint8_t)temp;
+	return 0;
+}
+
+static int
+parse_num_flows(const char *flows)
+{
+	char *end = NULL;
+
+	/* parse hexadecimal string */
+	num_flows = strtoul(flows, &end, 16);
+	if ((flows[0] == '\0') || (end == NULL) || (*end != '\0'))
+		return -1;
+
+	if (num_flows == 0)
+		return -1;
+
+	return 0;
+}
+
+/**
+ * The application specific arguments follow the DPDK-specific
+ * arguments which are stripped by the DPDK init. This function
+ * processes these application arguments, printing usage info
+ * on error.
+ */
+int
+parse_app_args(uint8_t max_ports, int argc, char *argv[])
+{
+	int option_index, opt;
+	char **argvopt = argv;
+	static struct option lgopts[] = { /* no long options */
+		{NULL, 0, 0, 0 }
+	};
+	progname = argv[0];
+
+	while ((opt = getopt_long(argc, argvopt, "n:f:p:", lgopts,
+			&option_index)) != EOF) {
+		switch (opt) {
+		case 'p':
+			if (parse_portmask(max_ports, optarg) != 0) {
+				usage();
+				return -1;
+			}
+			break;
+		case 'n':
+			if (parse_num_nodes(optarg) != 0) {
+				usage();
+				return -1;
+			}
+			break;
+		case 'f':
+			if (parse_num_flows(optarg) != 0) {
+				usage();
+				return -1;
+			}
+			break;
+		default:
+			printf("ERROR: Unknown option '%c'\n", opt);
+			usage();
+			return -1;
+		}
+	}
+
+	if (info->num_ports == 0 || num_nodes == 0) {
+		usage();
+		return -1;
+	}
+
+	if (info->num_ports % 2 != 0) {
+		printf("ERROR: application requires an even "
+				"number of ports to use\n");
+		return -1;
+	}
+	return 0;
+}