examples/ipv4_multicast/main.c

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

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <inttypes.h>
#include <sys/types.h>
#include <string.h>
#include <sys/queue.h>
#include <stdarg.h>
#include <errno.h>
#include <getopt.h>

#include <rte_common.h>
#include <rte_byteorder.h>
#include <rte_log.h>
#include <rte_memory.h>
#include <rte_memcpy.h>
#include <rte_eal.h>
#include <rte_launch.h>
#include <rte_atomic.h>
#include <rte_cycles.h>
#include <rte_prefetch.h>
#include <rte_lcore.h>
#include <rte_per_lcore.h>
#include <rte_branch_prediction.h>
#include <rte_interrupts.h>
#include <rte_random.h>
#include <rte_debug.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_mempool.h>
#include <rte_mbuf.h>
#include <rte_malloc.h>
#include <rte_fbk_hash.h>
#include <rte_ip.h>

#define RTE_LOGTYPE_IPv4_MULTICAST RTE_LOGTYPE_USER1

#define MAX_PORTS 16

#define MCAST_CLONE_PORTS   2
#define MCAST_CLONE_SEGS    2

#define PKT_MBUF_DATA_SIZE  RTE_MBUF_DEFAULT_BUF_SIZE
#define NB_PKT_MBUF 8192

#define HDR_MBUF_DATA_SIZE  (2 * RTE_PKTMBUF_HEADROOM)
#define NB_HDR_MBUF (NB_PKT_MBUF * MAX_PORTS)

#define NB_CLONE_MBUF   (NB_PKT_MBUF * MCAST_CLONE_PORTS * MCAST_CLONE_SEGS * 2)

/* allow max jumbo frame 9.5 KB */
#define JUMBO_FRAME_MAX_SIZE    0x2600

#define MAX_PKT_BURST 32
#define BURST_TX_DRAIN_US 100 /* TX drain every ~100us */

/* Configure how many packets ahead to prefetch, when reading packets */
#define PREFETCH_OFFSET 3

/*
 * Construct Ethernet multicast address from IPv4 multicast address.
 * Citing RFC 1112, section 6.4:
 * "An IP host group address is mapped to an Ethernet multicast address
 * by placing the low-order 23-bits of the IP address into the low-order
 * 23 bits of the Ethernet multicast address 01-00-5E-00-00-00 (hex)."
 */
#define ETHER_ADDR_FOR_IPV4_MCAST(x)    \
    (rte_cpu_to_be_64(0x01005e000000ULL | ((x) & 0x7fffff)) >> 16)

/*
 * Configurable number of RX/TX ring descriptors
 */
#define RTE_TEST_RX_DESC_DEFAULT 1024
#define RTE_TEST_TX_DESC_DEFAULT 1024
static uint16_t nb_rxd = RTE_TEST_RX_DESC_DEFAULT;
static uint16_t nb_txd = RTE_TEST_TX_DESC_DEFAULT;

/* ethernet addresses of ports */
static struct rte_ether_addr ports_eth_addr[MAX_PORTS];

/* mask of enabled ports */
static uint32_t enabled_port_mask = 0;

static uint16_t nb_ports;

static int rx_queue_per_lcore = 1;

struct mbuf_table {
    uint16_t len;
    struct rte_mbuf *m_table[MAX_PKT_BURST];
};

#define MAX_RX_QUEUE_PER_LCORE 16
#define MAX_TX_QUEUE_PER_PORT 16
struct lcore_queue_conf {
    uint64_t tx_tsc;
    uint16_t n_rx_queue;
    uint8_t rx_queue_list[MAX_RX_QUEUE_PER_LCORE];
    uint16_t tx_queue_id[MAX_PORTS];
    struct mbuf_table tx_mbufs[MAX_PORTS];
} __rte_cache_aligned;
static struct lcore_queue_conf lcore_queue_conf[RTE_MAX_LCORE];

static struct rte_eth_conf port_conf = {
    .rxmode = {
        .max_rx_pkt_len = JUMBO_FRAME_MAX_SIZE,
        .split_hdr_size = 0,
        .offloads = DEV_RX_OFFLOAD_JUMBO_FRAME,
    },
    .txmode = {
        .mq_mode = ETH_MQ_TX_NONE,
        .offloads = DEV_TX_OFFLOAD_MULTI_SEGS,
    },
};

static struct rte_mempool *packet_pool, *header_pool, *clone_pool;


/* Multicast */
static struct rte_fbk_hash_params mcast_hash_params = {
    .name = "MCAST_HASH",
    .entries = 1024,
    .entries_per_bucket = 4,
    .socket_id = 0,
    .hash_func = NULL,
    .init_val = 0,
};

struct rte_fbk_hash_table *mcast_hash = NULL;

struct mcast_group_params {
    uint32_t ip;
    uint16_t port_mask;
};

static struct mcast_group_params mcast_group_table[] = {
        {RTE_IPV4(224,0,0,101), 0x1},
        {RTE_IPV4(224,0,0,102), 0x2},
        {RTE_IPV4(224,0,0,103), 0x3},
        {RTE_IPV4(224,0,0,104), 0x4},
        {RTE_IPV4(224,0,0,105), 0x5},
        {RTE_IPV4(224,0,0,106), 0x6},
        {RTE_IPV4(224,0,0,107), 0x7},
        {RTE_IPV4(224,0,0,108), 0x8},
        {RTE_IPV4(224,0,0,109), 0x9},
        {RTE_IPV4(224,0,0,110), 0xA},
        {RTE_IPV4(224,0,0,111), 0xB},
        {RTE_IPV4(224,0,0,112), 0xC},
        {RTE_IPV4(224,0,0,113), 0xD},
        {RTE_IPV4(224,0,0,114), 0xE},
        {RTE_IPV4(224,0,0,115), 0xF},
};

#define N_MCAST_GROUPS \
    (sizeof (mcast_group_table) / sizeof (mcast_group_table[0]))


/* Send burst of packets on an output interface */
static void
send_burst(struct lcore_queue_conf *qconf, uint16_t port)
{
    struct rte_mbuf **m_table;
    uint16_t n, queueid;
    int ret;

    queueid = qconf->tx_queue_id[port];
    m_table = (struct rte_mbuf **)qconf->tx_mbufs[port].m_table;
    n = qconf->tx_mbufs[port].len;

    ret = rte_eth_tx_burst(port, queueid, m_table, n);
    while (unlikely (ret < n)) {
        rte_pktmbuf_free(m_table[ret]);
        ret++;
    }

    qconf->tx_mbufs[port].len = 0;
}

/* Get number of bits set. */
static inline uint32_t
bitcnt(uint32_t v)
{
    uint32_t n;

    for (n = 0; v != 0; v &= v - 1, n++)
        ;

    return n;
}

static inline struct rte_mbuf *
mcast_out_pkt(struct rte_mbuf *pkt, int use_clone)
{
    struct rte_mbuf *hdr;

    /* Create new mbuf for the header. */
    if (unlikely ((hdr = rte_pktmbuf_alloc(header_pool)) == NULL))
        return NULL;

    /* If requested, then make a new clone packet. */
    if (use_clone != 0 &&
        unlikely ((pkt = rte_pktmbuf_clone(pkt, clone_pool)) == NULL)) {
        rte_pktmbuf_free(hdr);
        return NULL;
    }

    /* prepend new header */
    hdr->next = pkt;

    /* update header's fields */
    hdr->pkt_len = (uint16_t)(hdr->data_len + pkt->pkt_len);
    hdr->nb_segs = pkt->nb_segs + 1;

    __rte_mbuf_sanity_check(hdr, 1);
    return hdr;
}

/*
 * Write new Ethernet header to the outgoing packet,
 * and put it into the outgoing queue for the given port.
 */
static inline void
mcast_send_pkt(struct rte_mbuf *pkt, struct rte_ether_addr *dest_addr,
        struct lcore_queue_conf *qconf, uint16_t port)
{
    struct rte_ether_hdr *ethdr;
    uint16_t len;

    /* Construct Ethernet header. */
    ethdr = (struct rte_ether_hdr *)
        rte_pktmbuf_prepend(pkt, (uint16_t)sizeof(*ethdr));
    RTE_ASSERT(ethdr != NULL);

    rte_ether_addr_copy(dest_addr, &ethdr->d_addr);
    rte_ether_addr_copy(&ports_eth_addr[port], &ethdr->s_addr);
    ethdr->ether_type = rte_be_to_cpu_16(RTE_ETHER_TYPE_IPV4);

    /* Put new packet into the output queue */
    len = qconf->tx_mbufs[port].len;
    qconf->tx_mbufs[port].m_table[len] = pkt;
    qconf->tx_mbufs[port].len = ++len;

    /* Transmit packets */
    if (unlikely(MAX_PKT_BURST == len))
        send_burst(qconf, port);
}

/* Multicast forward of the input packet */
static inline void
mcast_forward(struct rte_mbuf *m, struct lcore_queue_conf *qconf)
{
    struct rte_mbuf *mc;
    struct rte_ipv4_hdr *iphdr;
    uint32_t dest_addr, port_mask, port_num, use_clone;
    int32_t hash;
    uint16_t port;
    union {
        uint64_t as_int;
        struct rte_ether_addr as_addr;
    } dst_eth_addr;

    /* Remove the Ethernet header from the input packet */
    iphdr = (struct rte_ipv4_hdr *)
        rte_pktmbuf_adj(m, (uint16_t)sizeof(struct rte_ether_hdr));
    RTE_ASSERT(iphdr != NULL);

    dest_addr = rte_be_to_cpu_32(iphdr->dst_addr);

    /*
     * Check that it is a valid multicast address and
     * we have some active ports assigned to it.
     */
    if (!RTE_IS_IPV4_MCAST(dest_addr) ||
        (hash = rte_fbk_hash_lookup(mcast_hash, dest_addr)) <= 0 ||
        (port_mask = hash & enabled_port_mask) == 0) {
        rte_pktmbuf_free(m);
        return;
    }

    /* Calculate number of destination ports. */
    port_num = bitcnt(port_mask);

    /* Should we use rte_pktmbuf_clone() or not. */
    use_clone = (port_num <= MCAST_CLONE_PORTS &&
        m->nb_segs <= MCAST_CLONE_SEGS);

    /* Mark all packet's segments as referenced port_num times */
    if (use_clone == 0)
        rte_pktmbuf_refcnt_update(m, (uint16_t)port_num);

    /* construct destination ethernet address */
    dst_eth_addr.as_int = ETHER_ADDR_FOR_IPV4_MCAST(dest_addr);

    for (port = 0; use_clone != port_mask; port_mask >>= 1, port++) {

        /* Prepare output packet and send it out. */
        if ((port_mask & 1) != 0) {
            if (likely ((mc = mcast_out_pkt(m, use_clone)) != NULL))
                mcast_send_pkt(mc, &dst_eth_addr.as_addr,
                        qconf, port);
            else if (use_clone == 0)
                rte_pktmbuf_free(m);
        }
    }

    /*
     * If we making clone packets, then, for the last destination port,
     * we can overwrite input packet's metadata.
     */
    if (use_clone != 0)
        mcast_send_pkt(m, &dst_eth_addr.as_addr, qconf, port);
    else
        rte_pktmbuf_free(m);
}

/* Send burst of outgoing packet, if timeout expires. */
static inline void
send_timeout_burst(struct lcore_queue_conf *qconf)
{
    uint64_t cur_tsc;
    uint16_t portid;
    const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) / US_PER_S * BURST_TX_DRAIN_US;

    cur_tsc = rte_rdtsc();
    if (likely (cur_tsc < qconf->tx_tsc + drain_tsc))
        return;

    for (portid = 0; portid < MAX_PORTS; portid++) {
        if (qconf->tx_mbufs[portid].len != 0)
            send_burst(qconf, portid);
    }
    qconf->tx_tsc = cur_tsc;
}

/* main processing loop */
static int
main_loop(__rte_unused void *dummy)
{
    struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
    unsigned lcore_id;
    int i, j, nb_rx;
    uint16_t portid;
    struct lcore_queue_conf *qconf;

    lcore_id = rte_lcore_id();
    qconf = &lcore_queue_conf[lcore_id];


    if (qconf->n_rx_queue == 0) {
        RTE_LOG(INFO, IPv4_MULTICAST, "lcore %u has nothing to do\n",
            lcore_id);
        return 0;
    }

    RTE_LOG(INFO, IPv4_MULTICAST, "entering main loop on lcore %u\n",
        lcore_id);

    for (i = 0; i < qconf->n_rx_queue; i++) {

        portid = qconf->rx_queue_list[i];
        RTE_LOG(INFO, IPv4_MULTICAST, " -- lcoreid=%u portid=%d\n",
            lcore_id, portid);
    }

    while (1) {

        /*
         * Read packet from RX queues
         */
        for (i = 0; i < qconf->n_rx_queue; i++) {

            portid = qconf->rx_queue_list[i];
            nb_rx = rte_eth_rx_burst(portid, 0, pkts_burst,
                         MAX_PKT_BURST);

            /* Prefetch first packets */
            for (j = 0; j < PREFETCH_OFFSET && j < nb_rx; j++) {
                rte_prefetch0(rte_pktmbuf_mtod(
                        pkts_burst[j], void *));
            }

            /* Prefetch and forward already prefetched packets */
            for (j = 0; j < (nb_rx - PREFETCH_OFFSET); j++) {
                rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[
                        j + PREFETCH_OFFSET], void *));
                mcast_forward(pkts_burst[j], qconf);
            }

            /* Forward remaining prefetched packets */
            for (; j < nb_rx; j++) {
                mcast_forward(pkts_burst[j], qconf);
            }
        }

        /* Send out packets from TX queues */
        send_timeout_burst(qconf);
    }
}

/* display usage */
static void
print_usage(const char *prgname)
{
    printf("%s [EAL options] -- -p PORTMASK [-q NQ]\n"
        "  -p PORTMASK: hexadecimal bitmask of ports to configure\n"
        "  -q NQ: number of queue (=ports) per lcore (default is 1)\n",
        prgname);
}

static uint32_t
parse_portmask(const char *portmask)
{
    char *end = NULL;
    unsigned long pm;

    /* parse hexadecimal string */
    pm = strtoul(portmask, &end, 16);
    if ((portmask[0] == '\0') || (end == NULL) || (*end != '\0'))
        return 0;

    return (uint32_t)pm;
}

static int
parse_nqueue(const char *q_arg)
{
    char *end = NULL;
    unsigned long n;

    /* parse numerical string */
    errno = 0;
    n = strtoul(q_arg, &end, 0);
    if (errno != 0 || end == NULL || *end != '\0' ||
            n == 0 || n >= MAX_RX_QUEUE_PER_LCORE)
        return -1;

    return n;
}

/* Parse the argument given in the command line of the application */
static int
parse_args(int argc, char **argv)
{
    int opt, ret;
    char **argvopt;
    int option_index;
    char *prgname = argv[0];
    static struct option lgopts[] = {
        {NULL, 0, 0, 0}
    };

    argvopt = argv;

    while ((opt = getopt_long(argc, argvopt, "p:q:",
                  lgopts, &option_index)) != EOF) {

        switch (opt) {
        /* portmask */
        case 'p':
            enabled_port_mask = parse_portmask(optarg);
            if (enabled_port_mask == 0) {
                printf("invalid portmask\n");
                print_usage(prgname);
                return -1;
            }
            break;

        /* nqueue */
        case 'q':
            rx_queue_per_lcore = parse_nqueue(optarg);
            if (rx_queue_per_lcore < 0) {
                printf("invalid queue number\n");
                print_usage(prgname);
                return -1;
            }
            break;

        default:
            print_usage(prgname);
            return -1;
        }
    }

    if (optind >= 0)
        argv[optind-1] = prgname;

    ret = optind-1;
    optind = 1; /* reset getopt lib */
    return ret;
}

static void
print_ethaddr(const char *name, struct rte_ether_addr *eth_addr)
{
    char buf[RTE_ETHER_ADDR_FMT_SIZE];
    rte_ether_format_addr(buf, RTE_ETHER_ADDR_FMT_SIZE, eth_addr);
    printf("%s%s", name, buf);
}

static int
init_mcast_hash(void)
{
    uint32_t i;

    mcast_hash_params.socket_id = rte_socket_id();
    mcast_hash = rte_fbk_hash_create(&mcast_hash_params);
    if (mcast_hash == NULL){
        return -1;
    }

    for (i = 0; i < N_MCAST_GROUPS; i ++){
        if (rte_fbk_hash_add_key(mcast_hash,
            mcast_group_table[i].ip,
            mcast_group_table[i].port_mask) < 0) {
            return -1;
        }
    }

    return 0;
}

/* Check the link status of all ports in up to 9s, and print them finally */
static void
check_all_ports_link_status(uint32_t port_mask)
{
#define CHECK_INTERVAL 100 /* 100ms */
#define MAX_CHECK_TIME 90 /* 9s (90 * 100ms) in total */
    uint16_t portid;
    uint8_t count, all_ports_up, print_flag = 0;
    struct rte_eth_link link;

    printf("\nChecking link status");
    fflush(stdout);
    for (count = 0; count <= MAX_CHECK_TIME; count++) {
        all_ports_up = 1;
        RTE_ETH_FOREACH_DEV(portid) {
            if ((port_mask & (1 << portid)) == 0)
                continue;
            memset(&link, 0, sizeof(link));
            rte_eth_link_get_nowait(portid, &link);
            /* print link status if flag set */
            if (print_flag == 1) {
                if (link.link_status)
                    printf(
                    "Port%d Link Up. Speed %u Mbps - %s\n",
                    portid, link.link_speed,
                (link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
                    ("full-duplex") : ("half-duplex\n"));
                else
                    printf("Port %d Link Down\n", portid);
                continue;
            }
            /* clear all_ports_up flag if any link down */
            if (link.link_status == ETH_LINK_DOWN) {
                all_ports_up = 0;
                break;
            }
        }
        /* after finally printing all link status, get out */
        if (print_flag == 1)
            break;

        if (all_ports_up == 0) {
            printf(".");
            fflush(stdout);
            rte_delay_ms(CHECK_INTERVAL);
        }

        /* set the print_flag if all ports up or timeout */
        if (all_ports_up == 1 || count == (MAX_CHECK_TIME - 1)) {
            print_flag = 1;
            printf("done\n");
        }
    }
}

int
main(int argc, char **argv)
{
    struct lcore_queue_conf *qconf;
    struct rte_eth_dev_info dev_info;
    struct rte_eth_txconf *txconf;
    int ret;
    uint16_t queueid;
    unsigned lcore_id = 0, rx_lcore_id = 0;
    uint32_t n_tx_queue, nb_lcores;
    uint16_t portid;

    /* init EAL */
    ret = rte_eal_init(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Invalid EAL parameters\n");
    argc -= ret;
    argv += ret;

    /* parse application arguments (after the EAL ones) */
    ret = parse_args(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Invalid IPV4_MULTICAST parameters\n");

    /* create the mbuf pools */
    packet_pool = rte_pktmbuf_pool_create("packet_pool", NB_PKT_MBUF, 32,
        0, PKT_MBUF_DATA_SIZE, rte_socket_id());

    if (packet_pool == NULL)
        rte_exit(EXIT_FAILURE, "Cannot init packet mbuf pool\n");

    header_pool = rte_pktmbuf_pool_create("header_pool", NB_HDR_MBUF, 32,
        0, HDR_MBUF_DATA_SIZE, rte_socket_id());

    if (header_pool == NULL)
        rte_exit(EXIT_FAILURE, "Cannot init header mbuf pool\n");

    clone_pool = rte_pktmbuf_pool_create("clone_pool", NB_CLONE_MBUF, 32,
        0, 0, rte_socket_id());

    if (clone_pool == NULL)
        rte_exit(EXIT_FAILURE, "Cannot init clone mbuf pool\n");

    nb_ports = rte_eth_dev_count_avail();
    if (nb_ports == 0)
        rte_exit(EXIT_FAILURE, "No physical ports!\n");
    if (nb_ports > MAX_PORTS)
        nb_ports = MAX_PORTS;

    nb_lcores = rte_lcore_count();

    /* initialize all ports */
    RTE_ETH_FOREACH_DEV(portid) {
        struct rte_eth_rxconf rxq_conf;
        struct rte_eth_conf local_port_conf = port_conf;

        /* skip ports that are not enabled */
        if ((enabled_port_mask & (1 << portid)) == 0) {
            printf("Skipping disabled port %d\n", portid);
            continue;
        }

        qconf = &lcore_queue_conf[rx_lcore_id];

        /* limit the frame size to the maximum supported by NIC */
        rte_eth_dev_info_get(portid, &dev_info);
        local_port_conf.rxmode.max_rx_pkt_len = RTE_MIN(
            dev_info.max_rx_pktlen,
            local_port_conf.rxmode.max_rx_pkt_len);

        /* get the lcore_id for this port */
        while (rte_lcore_is_enabled(rx_lcore_id) == 0 ||
               qconf->n_rx_queue == (unsigned)rx_queue_per_lcore) {

            rx_lcore_id ++;
            qconf = &lcore_queue_conf[rx_lcore_id];

            if (rx_lcore_id >= RTE_MAX_LCORE)
                rte_exit(EXIT_FAILURE, "Not enough cores\n");
        }
        qconf->rx_queue_list[qconf->n_rx_queue] = portid;
        qconf->n_rx_queue++;

        /* init port */
        printf("Initializing port %d on lcore %u... ", portid,
               rx_lcore_id);
        fflush(stdout);

        n_tx_queue = nb_lcores;
        if (n_tx_queue > MAX_TX_QUEUE_PER_PORT)
            n_tx_queue = MAX_TX_QUEUE_PER_PORT;

        ret = rte_eth_dev_configure(portid, 1, (uint16_t)n_tx_queue,
                        &local_port_conf);
        if (ret < 0)
            rte_exit(EXIT_FAILURE, "Cannot configure device: err=%d, port=%d\n",
                  ret, portid);

        ret = rte_eth_dev_adjust_nb_rx_tx_desc(portid, &nb_rxd,
                               &nb_txd);
        if (ret < 0)
            rte_exit(EXIT_FAILURE,
                 "Cannot adjust number of descriptors: err=%d, port=%d\n",
                 ret, portid);

        rte_eth_macaddr_get(portid, &ports_eth_addr[portid]);
        print_ethaddr(" Address:", &ports_eth_addr[portid]);
        printf(", ");

        /* init one RX queue */
        queueid = 0;
        printf("rxq=%hu ", queueid);
        fflush(stdout);
        rxq_conf = dev_info.default_rxconf;
        rxq_conf.offloads = local_port_conf.rxmode.offloads;
        ret = rte_eth_rx_queue_setup(portid, queueid, nb_rxd,
                         rte_eth_dev_socket_id(portid),
                         &rxq_conf,
                         packet_pool);
        if (ret < 0)
            rte_exit(EXIT_FAILURE, "rte_eth_tx_queue_setup: err=%d, port=%d\n",
                  ret, portid);

        /* init one TX queue per couple (lcore,port) */
        queueid = 0;

        RTE_LCORE_FOREACH(lcore_id) {
            if (rte_lcore_is_enabled(lcore_id) == 0)
                continue;
            printf("txq=%u,%hu ", lcore_id, queueid);
            fflush(stdout);

            txconf = &dev_info.default_txconf;
            txconf->offloads = local_port_conf.txmode.offloads;
            ret = rte_eth_tx_queue_setup(portid, queueid, nb_txd,
                             rte_lcore_to_socket_id(lcore_id), txconf);
            if (ret < 0)
                rte_exit(EXIT_FAILURE, "rte_eth_tx_queue_setup: err=%d, "
                      "port=%d\n", ret, portid);

            qconf = &lcore_queue_conf[lcore_id];
            qconf->tx_queue_id[portid] = queueid;
            queueid++;
        }
        rte_eth_allmulticast_enable(portid);
        /* Start device */
        ret = rte_eth_dev_start(portid);
        if (ret < 0)
            rte_exit(EXIT_FAILURE, "rte_eth_dev_start: err=%d, port=%d\n",
                  ret, portid);

        printf("done:\n");
    }

    check_all_ports_link_status(enabled_port_mask);

    /* initialize the multicast hash */
    int retval = init_mcast_hash();
    if (retval != 0)
        rte_exit(EXIT_FAILURE, "Cannot build the multicast hash\n");

    /* launch per-lcore init on every lcore */
    rte_eal_mp_remote_launch(main_loop, NULL, CALL_MASTER);
    RTE_LCORE_FOREACH_SLAVE(lcore_id) {
        if (rte_eal_wait_lcore(lcore_id) < 0)
            return -1;
    }

    return 0;
}