/* 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;
}