examples/multi_process/client_server_mp/mp_server/args.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 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_ethdev.h>
#include <rte_string_fns.h>

#include "common.h"
#include "args.h"
#include "init.h"

/* global var for number of clients - extern in header */
uint8_t num_clients;

static const char *progname;

static void
usage(void)
{
    printf(
        "%s [EAL options] -- -p PORTMASK -n NUM_CLIENTS [-s NUM_SOCKETS]\n"
        " -p PORTMASK: hexadecimal bitmask of ports to use\n"
        " -n NUM_CLIENTS: number of client processes to use\n"
        , progname);
}

static int
parse_portmask(const char *portmask)
{
    char *end = NULL;
    unsigned long long pm;
    uint16_t id;

    if (portmask == NULL || *portmask == '\0')
        return -1;

    /* convert parameter to a number and verify */
    errno = 0;
    pm = strtoull(portmask, &end, 16);
    if (errno != 0 || end == NULL || *end != '\0')
        return -1;

    RTE_ETH_FOREACH_DEV(id) {
        unsigned long msk = 1u << id;

        if ((pm & msk) == 0)
            continue;

        pm &= ~msk;
        ports->id[ports->num_ports++] = id;
    }

    if (pm != 0) {
        printf("WARNING: leftover ports in mask %#llx - ignoring\n",
               pm);
    }

    return 0;
}

static int
parse_num_clients(const char *clients)
{
    char *end = NULL;
    unsigned long temp;

    if (clients == NULL || *clients == '\0')
        return -1;

    temp = strtoul(clients, &end, 10);
    if (end == NULL || *end != '\0' || temp == 0)
        return -1;

    num_clients = (uint8_t)temp;
    return 0;
}

int
parse_app_args(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:p:", lgopts,
        &option_index)) != EOF){
        switch (opt){
            case 'p':
                if (parse_portmask(optarg) != 0) {
                    usage();
                    return -1;
                }
                break;
            case 'n':
                if (parse_num_clients(optarg) != 0){
                    usage();
                    return -1;
                }
                break;
            default:
                printf("ERROR: Unknown option '%c'\n", opt);
                usage();
                return -1;
        }
    }

    if (ports->num_ports == 0 || num_clients == 0){
        usage();
        return -1;
    }

    if (ports->num_ports % 2 != 0){
        printf("ERROR: application requires an even number of ports to use\n");
        return -1;
    }
    return 0;
}