examples/quota_watermark/qw/args.c

/*-
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 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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 *   modification, are permitted provided that the following conditions
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 *       notice, this list of conditions and the following disclaimer.
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 *       notice, this list of conditions and the following disclaimer in
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 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#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;
}