examples/multi_process/client_server_mp/mp_server/args.c

/*-
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 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
 *   All rights reserved.
 *
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 *   modification, are permitted provided that the following conditions
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 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
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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
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#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"

/* 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(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)count);
                        else
                            ports->id[ports->num_ports++] = count;
                }
                pm = (pm >> 1);
                count++;
        }

        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(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: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_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;
}