examples/l2fwd-keepalive/main.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2016 Intel Corporation
 */
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <setjmp.h>
#include <stdarg.h>
#include <ctype.h>
#include <errno.h>
#include <getopt.h>
#include <signal.h>
 
#include <rte_common.h>
#include <rte_log.h>
#include <rte_malloc.h>
#include <rte_memory.h>
#include <rte_memcpy.h>
#include <rte_eal.h>
#include <rte_launch.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_timer.h>
#include <rte_keepalive.h>
 
#include "shm.h"
 
#define RTE_LOGTYPE_L2FWD RTE_LOGTYPE_USER1
 
#define NB_MBUF_PER_PORT 3000
 
#define MAX_PKT_BURST 32
#define BURST_TX_DRAIN_US 100 /* TX drain every ~100us */
 
/*
 * 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 l2fwd_ports_eth_addr[RTE_MAX_ETHPORTS];
 
/* mask of enabled ports */
static uint32_t l2fwd_enabled_port_mask;
 
/* list of enabled ports */
static uint32_t l2fwd_dst_ports[RTE_MAX_ETHPORTS];
 
static unsigned int l2fwd_rx_queue_per_lcore = 1;
 
#define MAX_RX_QUEUE_PER_LCORE 16
#define MAX_TX_QUEUE_PER_PORT 16
struct lcore_queue_conf {
    unsigned n_rx_port;
    unsigned rx_port_list[MAX_RX_QUEUE_PER_LCORE];
} __rte_cache_aligned;
struct lcore_queue_conf lcore_queue_conf[RTE_MAX_LCORE];
 
struct rte_eth_dev_tx_buffer *tx_buffer[RTE_MAX_ETHPORTS];
 
static struct rte_eth_conf port_conf = {
    .rxmode = {
        .split_hdr_size = 0,
    },
    .txmode = {
        .mq_mode = RTE_ETH_MQ_TX_NONE,
    },
};
 
struct rte_mempool *l2fwd_pktmbuf_pool = NULL;
 
/* Per-port statistics struct */
struct l2fwd_port_statistics {
    uint64_t tx;
    uint64_t rx;
    uint64_t dropped;
} __rte_cache_aligned;
struct l2fwd_port_statistics port_statistics[RTE_MAX_ETHPORTS];
 
/* A tsc-based timer responsible for triggering statistics printout */
#define TIMER_MILLISECOND 1
#define MAX_TIMER_PERIOD 86400 /* 1 day max */
static int64_t timer_period = 10 * TIMER_MILLISECOND * 1000; /* 10 seconds */
static int64_t check_period = 5; /* default check cycle is 5ms */
 
/* Keepalive structure */
struct rte_keepalive *rte_global_keepalive_info;
 
/* Termination signalling */
static int terminate_signal_received;
 
/* Termination signal handler */
static void handle_sigterm(__rte_unused int value)
{
    terminate_signal_received = 1;
}
 
/* Print out statistics on packets dropped */
static void
print_stats(__rte_unused struct rte_timer *ptr_timer,
    __rte_unused void *ptr_data)
{
    uint64_t total_packets_dropped, total_packets_tx, total_packets_rx;
    uint16_t portid;
 
    total_packets_dropped = 0;
    total_packets_tx = 0;
    total_packets_rx = 0;
 
    const char clr[] = { 27, '[', '2', 'J', '\0' };
    const char topLeft[] = { 27, '[', '1', ';', '1', 'H', '\0' };
 
        /* Clear screen and move to top left */
    printf("%s%s", clr, topLeft);
 
    printf("\nPort statistics ====================================");
 
    for (portid = 0; portid < RTE_MAX_ETHPORTS; portid++) {
        /* skip disabled ports */
        if ((l2fwd_enabled_port_mask & (1 << portid)) == 0)
            continue;
        printf("\nStatistics for port %u ------------------------------"
               "\nPackets sent: %24"PRIu64
               "\nPackets received: %20"PRIu64
               "\nPackets dropped: %21"PRIu64,
               portid,
               port_statistics[portid].tx,
               port_statistics[portid].rx,
               port_statistics[portid].dropped);
 
        total_packets_dropped += port_statistics[portid].dropped;
        total_packets_tx += port_statistics[portid].tx;
        total_packets_rx += port_statistics[portid].rx;
    }
    printf("\nAggregate statistics ==============================="
           "\nTotal packets sent: %18"PRIu64
           "\nTotal packets received: %14"PRIu64
           "\nTotal packets dropped: %15"PRIu64,
           total_packets_tx,
           total_packets_rx,
           total_packets_dropped);
    printf("\n====================================================\n");
 
    fflush(stdout);
}
 
static void
l2fwd_simple_forward(struct rte_mbuf *m, unsigned portid)
{
    struct rte_ether_hdr *eth;
    void *tmp;
    int sent;
    unsigned dst_port;
    struct rte_eth_dev_tx_buffer *buffer;
 
    dst_port = l2fwd_dst_ports[portid];
    eth = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
 
    /* 02:00:00:00:00:xx */
    tmp = &eth->dst_addr.addr_bytes[0];
    *((uint64_t *)tmp) = 0x000000000002 + ((uint64_t)dst_port << 40);
 
    /* src addr */
    rte_ether_addr_copy(&l2fwd_ports_eth_addr[dst_port], &eth->src_addr);
 
    buffer = tx_buffer[dst_port];
    sent = rte_eth_tx_buffer(dst_port, 0, buffer, m);
    if (sent)
        port_statistics[dst_port].tx += sent;
}
 
/* main processing loop */
static void
l2fwd_main_loop(void)
{
    struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
    struct rte_mbuf *m;
    int sent;
    unsigned lcore_id;
    uint64_t prev_tsc, diff_tsc, cur_tsc;
    unsigned i, j, portid, nb_rx;
    struct lcore_queue_conf *qconf;
    const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1)
        / US_PER_S * BURST_TX_DRAIN_US;
    struct rte_eth_dev_tx_buffer *buffer;
 
    prev_tsc = 0;
 
    lcore_id = rte_lcore_id();
    qconf = &lcore_queue_conf[lcore_id];
 
    if (qconf->n_rx_port == 0) {
        RTE_LOG(INFO, L2FWD, "lcore %u has nothing to do\n", lcore_id);
        return;
    }
 
    RTE_LOG(INFO, L2FWD, "entering main loop on lcore %u\n", lcore_id);
 
    for (i = 0; i < qconf->n_rx_port; i++) {
 
        portid = qconf->rx_port_list[i];
        RTE_LOG(INFO, L2FWD, " -- lcoreid=%u portid=%u\n", lcore_id,
            portid);
    }
 
    uint64_t tsc_initial = rte_rdtsc();
    uint64_t tsc_lifetime = (rand()&0x07) * rte_get_tsc_hz();
 
    while (!terminate_signal_received) {
        /* Keepalive heartbeat. 8< */
        rte_keepalive_mark_alive(rte_global_keepalive_info);
 
        cur_tsc = rte_rdtsc();
 
        /*
         * Die randomly within 7 secs for demo purposes if
         * keepalive enabled
         */
        if (check_period > 0 && cur_tsc - tsc_initial > tsc_lifetime)
            break;
        /* >8 End of keepalive heartbeat. */
 
        /*
         * TX burst queue drain
         */
        diff_tsc = cur_tsc - prev_tsc;
        if (unlikely(diff_tsc > drain_tsc)) {
 
            for (i = 0; i < qconf->n_rx_port; i++) {
 
                portid = l2fwd_dst_ports[qconf->rx_port_list[i]];
                buffer = tx_buffer[portid];
 
                sent = rte_eth_tx_buffer_flush(portid, 0, buffer);
                if (sent)
                    port_statistics[portid].tx += sent;
 
            }
 
            prev_tsc = cur_tsc;
        }
 
        /*
         * Read packet from RX queues
         */
        for (i = 0; i < qconf->n_rx_port; i++) {
 
            portid = qconf->rx_port_list[i];
            nb_rx = rte_eth_rx_burst(portid, 0,
                         pkts_burst, MAX_PKT_BURST);
 
            port_statistics[portid].rx += nb_rx;
 
            for (j = 0; j < nb_rx; j++) {
                m = pkts_burst[j];
                rte_prefetch0(rte_pktmbuf_mtod(m, void *));
                l2fwd_simple_forward(m, portid);
            }
        }
    }
}
 
static int
l2fwd_launch_one_lcore(__rte_unused void *dummy)
{
    l2fwd_main_loop();
    return 0;
}
 
/* display usage */
static void
l2fwd_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"
           "  -K PERIOD: Keepalive check period (5 default; 86400 max)\n"
           "  -T PERIOD: statistics will be refreshed each PERIOD seconds (0 to disable, 10 default, 86400 maximum)\n",
           prgname);
}
 
static int
l2fwd_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 pm;
}
 
static unsigned int
l2fwd_parse_nqueue(const char *q_arg)
{
    char *end = NULL;
    unsigned long n;
 
    /* parse hexadecimal string */
    n = strtoul(q_arg, &end, 10);
    if ((q_arg[0] == '\0') || (end == NULL) || (*end != '\0'))
        return 0;
    if (n == 0)
        return 0;
    if (n >= MAX_RX_QUEUE_PER_LCORE)
        return 0;
 
    return n;
}
 
static int
l2fwd_parse_timer_period(const char *q_arg)
{
    char *end = NULL;
    int n;
 
    /* parse number string */
    n = strtol(q_arg, &end, 10);
    if ((q_arg[0] == '\0') || (end == NULL) || (*end != '\0'))
        return -1;
    if (n >= MAX_TIMER_PERIOD)
        return -1;
 
    return n;
}
 
static int
l2fwd_parse_check_period(const char *q_arg)
{
    char *end = NULL;
    int n;
 
    /* parse number string */
    n = strtol(q_arg, &end, 10);
    if ((q_arg[0] == '\0') || (end == NULL) || (*end != '\0'))
        return -1;
    if (n >= MAX_TIMER_PERIOD)
        return -1;
 
    return n;
}
 
/* Parse the argument given in the command line of the application */
static int
l2fwd_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:T:K:",
                  lgopts, &option_index)) != EOF) {
 
        switch (opt) {
        /* portmask */
        case 'p':
            l2fwd_enabled_port_mask = l2fwd_parse_portmask(optarg);
            if (l2fwd_enabled_port_mask == 0) {
                printf("invalid portmask\n");
                l2fwd_usage(prgname);
                return -1;
            }
            break;
 
        /* nqueue */
        case 'q':
            l2fwd_rx_queue_per_lcore = l2fwd_parse_nqueue(optarg);
            if (l2fwd_rx_queue_per_lcore == 0) {
                printf("invalid queue number\n");
                l2fwd_usage(prgname);
                return -1;
            }
            break;
 
        /* timer period */
        case 'T':
            timer_period = l2fwd_parse_timer_period(optarg)
                * (int64_t)(1000 * TIMER_MILLISECOND);
            if (timer_period < 0) {
                printf("invalid timer period\n");
                l2fwd_usage(prgname);
                return -1;
            }
            break;
 
        /* Check period */
        case 'K':
            check_period = l2fwd_parse_check_period(optarg);
            if (check_period < 0) {
                printf("invalid check period\n");
                l2fwd_usage(prgname);
                return -1;
            }
            break;
 
        /* long options */
        case 0:
            l2fwd_usage(prgname);
            return -1;
 
        default:
            l2fwd_usage(prgname);
            return -1;
        }
    }
 
    if (optind >= 0)
        argv[optind-1] = prgname;
 
    ret = optind-1;
    optind = 1; /* reset getopt lib */
    return ret;
}
 
/* 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;
    int ret;
    char link_status_text[RTE_ETH_LINK_MAX_STR_LEN];
 
    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));
            ret = rte_eth_link_get_nowait(portid, &link);
            if (ret < 0) {
                all_ports_up = 0;
                if (print_flag == 1)
                    printf("Port %u link get failed: %s\n",
                        portid, rte_strerror(-ret));
                continue;
            }
            /* print link status if flag set */
            if (print_flag == 1) {
                rte_eth_link_to_str(link_status_text,
                    sizeof(link_status_text), &link);
                printf("Port %d %s\n", portid,
                       link_status_text);
                continue;
            }
            /* clear all_ports_up flag if any link down */
            if (link.link_status == RTE_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");
        }
    }
}
 
static void
dead_core(__rte_unused void *ptr_data, const int id_core)
{
    if (terminate_signal_received)
        return;
    printf("Dead core %i - restarting..\n", id_core);
    if (rte_eal_get_lcore_state(id_core) == WAIT) {
        rte_eal_remote_launch(l2fwd_launch_one_lcore, NULL, id_core);
    } else {
        printf("..false positive!\n");
    }
}
 
static void
relay_core_state(void *ptr_data, const int id_core,
    const enum rte_keepalive_state core_state, uint64_t last_alive)
{
    rte_keepalive_relayed_state((struct rte_keepalive_shm *)ptr_data,
        id_core, core_state, last_alive);
}
 
int
main(int argc, char **argv)
{
    struct lcore_queue_conf *qconf;
    int ret;
    uint16_t nb_ports;
    uint16_t nb_ports_available = 0;
    uint16_t portid, last_port;
    unsigned lcore_id, rx_lcore_id;
    unsigned nb_ports_in_mask = 0;
    unsigned int total_nb_mbufs;
    struct sigaction signal_handler;
    struct rte_keepalive_shm *ka_shm;
 
    memset(&signal_handler, 0, sizeof(signal_handler));
    terminate_signal_received = 0;
    signal_handler.sa_handler = &handle_sigterm;
    if (sigaction(SIGINT, &signal_handler, NULL) == -1 ||
            sigaction(SIGTERM, &signal_handler, NULL) == -1)
        rte_exit(EXIT_FAILURE, "SIGNAL\n");
 
 
    /* init EAL */
    ret = rte_eal_init(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Invalid EAL arguments\n");
    argc -= ret;
    argv += ret;
 
    l2fwd_enabled_port_mask = 0;
 
    /* parse application arguments (after the EAL ones) */
    ret = l2fwd_parse_args(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Invalid L2FWD arguments\n");
 
    nb_ports = rte_eth_dev_count_avail();
    if (nb_ports == 0)
        rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");
 
    /* create the mbuf pool */
    total_nb_mbufs = NB_MBUF_PER_PORT * nb_ports;
 
    l2fwd_pktmbuf_pool = rte_pktmbuf_pool_create("mbuf_pool",
        total_nb_mbufs, 32, 0, RTE_MBUF_DEFAULT_BUF_SIZE,
        rte_socket_id());
    if (l2fwd_pktmbuf_pool == NULL)
        rte_exit(EXIT_FAILURE, "Cannot init mbuf pool\n");
 
    /* reset l2fwd_dst_ports */
    for (portid = 0; portid < RTE_MAX_ETHPORTS; portid++)
        l2fwd_dst_ports[portid] = 0;
    last_port = 0;
 
    /*
     * Each logical core is assigned a dedicated TX queue on each port.
     */
    RTE_ETH_FOREACH_DEV(portid) {
        /* skip ports that are not enabled */
        if ((l2fwd_enabled_port_mask & (1 << portid)) == 0)
            continue;
 
        if (nb_ports_in_mask % 2) {
            l2fwd_dst_ports[portid] = last_port;
            l2fwd_dst_ports[last_port] = portid;
        } else
            last_port = portid;
 
        nb_ports_in_mask++;
    }
    if (nb_ports_in_mask % 2) {
        printf("Notice: odd number of ports in portmask.\n");
        l2fwd_dst_ports[last_port] = last_port;
    }
 
    rx_lcore_id = 1;
    qconf = NULL;
 
    /* Initialize the port/queue configuration of each logical core */
    RTE_ETH_FOREACH_DEV(portid) {
        /* skip ports that are not enabled */
        if ((l2fwd_enabled_port_mask & (1 << portid)) == 0)
            continue;
 
        /* get the lcore_id for this port */
        while (rte_lcore_is_enabled(rx_lcore_id) == 0 ||
               lcore_queue_conf[rx_lcore_id].n_rx_port ==
               l2fwd_rx_queue_per_lcore) {
            rx_lcore_id++;
            if (rx_lcore_id >= RTE_MAX_LCORE)
                rte_exit(EXIT_FAILURE, "Not enough cores\n");
        }
 
        if (qconf != &lcore_queue_conf[rx_lcore_id])
            /* Assigned a new logical core in the loop above. */
            qconf = &lcore_queue_conf[rx_lcore_id];
 
        qconf->rx_port_list[qconf->n_rx_port] = portid;
        qconf->n_rx_port++;
        printf("Lcore %u: RX port %u\n",
            rx_lcore_id, portid);
    }
 
    /* Initialise each port */
    RTE_ETH_FOREACH_DEV(portid) {
        struct rte_eth_dev_info dev_info;
        struct rte_eth_rxconf rxq_conf;
        struct rte_eth_txconf txq_conf;
        struct rte_eth_conf local_port_conf = port_conf;
 
        /* skip ports that are not enabled */
        if ((l2fwd_enabled_port_mask & (1 << portid)) == 0) {
            printf("Skipping disabled port %u\n", portid);
            continue;
        }
        nb_ports_available++;
 
        /* init port */
        printf("Initializing port %u... ", portid);
        fflush(stdout);
 
        ret = rte_eth_dev_info_get(portid, &dev_info);
        if (ret != 0)
            rte_exit(EXIT_FAILURE,
                "Error during getting device (port %u) info: %s\n",
                portid, strerror(-ret));
 
        if (dev_info.tx_offload_capa & RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE)
            local_port_conf.txmode.offloads |=
                RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE;
        ret = rte_eth_dev_configure(portid, 1, 1, &local_port_conf);
        if (ret < 0)
            rte_exit(EXIT_FAILURE,
                "Cannot configure device: err=%d, port=%u\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=%u\n",
                ret, portid);
 
        ret = rte_eth_macaddr_get(portid,
                      &l2fwd_ports_eth_addr[portid]);
        if (ret < 0)
            rte_exit(EXIT_FAILURE,
                "Cannot mac address: err=%d, port=%u\n",
                ret, portid);
 
        /* init one RX queue */
        fflush(stdout);
        rxq_conf = dev_info.default_rxconf;
        rxq_conf.offloads = local_port_conf.rxmode.offloads;
        ret = rte_eth_rx_queue_setup(portid, 0, nb_rxd,
                         rte_eth_dev_socket_id(portid),
                         &rxq_conf,
                         l2fwd_pktmbuf_pool);
        if (ret < 0)
            rte_exit(EXIT_FAILURE,
                "rte_eth_rx_queue_setup:err=%d, port=%u\n",
                ret, portid);
 
        /* init one TX queue on each port */
        fflush(stdout);
        txq_conf = dev_info.default_txconf;
        txq_conf.offloads = local_port_conf.txmode.offloads;
        ret = rte_eth_tx_queue_setup(portid, 0, nb_txd,
                rte_eth_dev_socket_id(portid),
                &txq_conf);
        if (ret < 0)
            rte_exit(EXIT_FAILURE,
                "rte_eth_tx_queue_setup:err=%d, port=%u\n",
                ret, portid);
 
        /* Initialize TX buffers */
        tx_buffer[portid] = rte_zmalloc_socket("tx_buffer",
                RTE_ETH_TX_BUFFER_SIZE(MAX_PKT_BURST), 0,
                rte_eth_dev_socket_id(portid));
        if (tx_buffer[portid] == NULL)
            rte_exit(EXIT_FAILURE, "Cannot allocate buffer for tx on port %u\n",
                        portid);
 
        rte_eth_tx_buffer_init(tx_buffer[portid], MAX_PKT_BURST);
 
        ret = rte_eth_tx_buffer_set_err_callback(tx_buffer[portid],
                rte_eth_tx_buffer_count_callback,
                &port_statistics[portid].dropped);
        if (ret < 0)
            rte_exit(EXIT_FAILURE,
            "Cannot set error callback for tx buffer on port %u\n",
                 portid);
 
        /* Start device */
        ret = rte_eth_dev_start(portid);
        if (ret < 0)
            rte_exit(EXIT_FAILURE,
                "rte_eth_dev_start:err=%d, port=%u\n",
                  ret, portid);
 
        ret = rte_eth_promiscuous_enable(portid);
        if (ret != 0)
            rte_exit(EXIT_FAILURE,
                 "rte_eth_promiscuous_enable:err=%s, port=%u\n",
                 rte_strerror(-ret), portid);
 
        printf("Port %u, MAC address: "
            RTE_ETHER_ADDR_PRT_FMT "\n\n",
            portid,
            RTE_ETHER_ADDR_BYTES(&l2fwd_ports_eth_addr[portid]));
 
        /* initialize port stats */
        memset(&port_statistics, 0, sizeof(port_statistics));
    }
 
    if (!nb_ports_available) {
        rte_exit(EXIT_FAILURE,
            "All available ports are disabled. Please set portmask.\n");
    }
 
    check_all_ports_link_status(l2fwd_enabled_port_mask);
 
    struct rte_timer hb_timer, stats_timer;
 
    rte_timer_subsystem_init();
    rte_timer_init(&stats_timer);
 
    ka_shm = NULL;
    if (check_period > 0) {
        ka_shm = rte_keepalive_shm_create();
        if (ka_shm == NULL)
            rte_exit(EXIT_FAILURE,
                "rte_keepalive_shm_create() failed");
        /* Initialize keepalive functionality. 8< */
        rte_global_keepalive_info =
            rte_keepalive_create(&dead_core, ka_shm);
        if (rte_global_keepalive_info == NULL)
            rte_exit(EXIT_FAILURE, "init_keep_alive() failed");
        /* >8 End of initializing keepalive functionality. */
        rte_keepalive_register_relay_callback(rte_global_keepalive_info,
            relay_core_state, ka_shm);
        rte_timer_init(&hb_timer);
        if (rte_timer_reset(&hb_timer,
                (check_period * rte_get_timer_hz()) / 1000,
                PERIODICAL,
                rte_lcore_id(),
                (void(*)(struct rte_timer*, void*))
                &rte_keepalive_dispatch_pings,
                rte_global_keepalive_info
                ) != 0 )
            rte_exit(EXIT_FAILURE, "Keepalive setup failure.\n");
    }
    if (timer_period > 0) {
        /* Issues the pings keepalive_dispatch_pings(). 8< */
        if (rte_timer_reset(&stats_timer,
                (timer_period * rte_get_timer_hz()) / 1000,
                PERIODICAL,
                rte_lcore_id(),
                &print_stats, NULL
                ) != 0 )
            rte_exit(EXIT_FAILURE, "Stats setup failure.\n");
        /* >8 End of issuing the pings keepalive_dispatch_pings(). */
    }
    /* launch per-lcore init on every worker lcore */
    RTE_LCORE_FOREACH_WORKER(lcore_id) {
        struct lcore_queue_conf *qconf = &lcore_queue_conf[lcore_id];
 
        if (qconf->n_rx_port == 0)
            RTE_LOG(INFO, L2FWD,
                "lcore %u has nothing to do\n",
                lcore_id
                );
        else {
            rte_eal_remote_launch(
                l2fwd_launch_one_lcore,
                NULL,
                lcore_id
                );
            rte_keepalive_register_core(rte_global_keepalive_info,
                lcore_id);
        }
    }
    while (!terminate_signal_received) {
        rte_timer_manage();
        rte_delay_ms(5);
        }
 
    RTE_LCORE_FOREACH_WORKER(lcore_id) {
        if (rte_eal_wait_lcore(lcore_id) < 0)
            return -1;
    }
 
    if (ka_shm != NULL)
        rte_keepalive_shm_cleanup(ka_shm);
 
    /* clean up the EAL */
    rte_eal_cleanup();
 
    return 0;
}