examples/quota_watermark/qw/args.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <rte_common.h>
#include <rte_lcore.h>

#include "args.h"


unsigned int portmask = 0;


static void
usage(const char *prgname)
{
    fprintf(stderr, "Usage: %s [EAL args] -- -p <portmask>\n"
            "-p PORTMASK: hexadecimal bitmask of NIC ports to configure\n",
            prgname);
}

static unsigned long
parse_portmask(const char *portmask_str)
{
    return strtoul(portmask_str, NULL, 16);
}

static void
check_core_count(void)
{
    if (rte_lcore_count() < 3)
        rte_exit(EXIT_FAILURE,
                "At least 3 cores need to be passed in the coremask\n");
}

static void
check_portmask_value(unsigned int portmask)
{
    unsigned int port_nb = 0;

    port_nb = __builtin_popcount(portmask);

    if (port_nb == 0)
        rte_exit(EXIT_FAILURE,
                "At least 2 ports need to be passed in the portmask\n");

    if (port_nb % 2 != 0)
        rte_exit(EXIT_FAILURE,
                "An even number of ports is required in the portmask\n");
}

int
parse_qw_args(int argc, char **argv)
{
    int opt;

    while ((opt = getopt(argc, argv, "h:p:")) != -1) {
        switch (opt) {
        case 'h':
            usage(argv[0]);
            break;
        case 'p':
            portmask = parse_portmask(optarg);
            break;
        default:
            usage(argv[0]);
        }
    }

    check_core_count();
    check_portmask_value(portmask);

    return 0;
}