examples/server_node_efd/server/args.c

/* 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;

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);
}

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;
}

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;
}

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;
}