examples/l2fwd-jobstats/main.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2016 Intel Corporation
 */

#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <ctype.h>
#include <getopt.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_debug.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_mempool.h>
#include <rte_mbuf.h>
#include <rte_spinlock.h>

#include <rte_errno.h>
#include <rte_jobstats.h>
#include <rte_timer.h>
#include <rte_alarm.h>
#include <rte_pause.h>

#define RTE_LOGTYPE_L2FWD RTE_LOGTYPE_USER1

#define NB_MBUF   8192

#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];

#define UPDATE_STEP_UP 1
#define UPDATE_STEP_DOWN 32

static unsigned int l2fwd_rx_queue_per_lcore = 1;

#define MAX_RX_QUEUE_PER_LCORE 16
#define MAX_TX_QUEUE_PER_PORT 16
/* List of queues to be polled for given lcore. 8< */
struct lcore_queue_conf {
    unsigned n_rx_port;
    unsigned rx_port_list[MAX_RX_QUEUE_PER_LCORE];
    uint64_t next_flush_time[RTE_MAX_ETHPORTS];

    struct rte_timer rx_timers[MAX_RX_QUEUE_PER_LCORE];
    struct rte_jobstats port_fwd_jobs[MAX_RX_QUEUE_PER_LCORE];

    struct rte_timer flush_timer;
    struct rte_jobstats flush_job;
    struct rte_jobstats idle_job;
    struct rte_jobstats_context jobs_context;

    uint16_t stats_read_pending;
    rte_spinlock_t lock;
} __rte_cache_aligned;
/* >8 End of list of queues to be polled for given lcore. */
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];

/* 1 day max */
#define MAX_TIMER_PERIOD 86400
/* default period is 10 seconds */
static int64_t timer_period = 10;
/* default timer frequency */
static double hz;
/* BURST_TX_DRAIN_US converted to cycles */
uint64_t drain_tsc;
/* Convert cycles to ns */
static inline double
cycles_to_ns(uint64_t cycles)
{
    double t = cycles;

    t *= (double)NS_PER_S;
    t /= hz;
    return t;
}

static void
show_lcore_stats(unsigned lcore_id)
{
    struct lcore_queue_conf *qconf = &lcore_queue_conf[lcore_id];
    struct rte_jobstats_context *ctx = &qconf->jobs_context;
    struct rte_jobstats *job;
    uint8_t i;

    /* LCore statistics. */
    uint64_t stats_period, loop_count;
    uint64_t exec, exec_min, exec_max;
    uint64_t management, management_min, management_max;
    uint64_t busy, busy_min, busy_max;

    /* Jobs statistics. */
    const uint16_t port_cnt = qconf->n_rx_port;
    uint64_t jobs_exec_cnt[port_cnt], jobs_period[port_cnt];
    uint64_t jobs_exec[port_cnt], jobs_exec_min[port_cnt],
                jobs_exec_max[port_cnt];

    uint64_t flush_exec_cnt, flush_period;
    uint64_t flush_exec, flush_exec_min, flush_exec_max;

    uint64_t idle_exec_cnt;
    uint64_t idle_exec, idle_exec_min, idle_exec_max;
    uint64_t collection_time = rte_get_timer_cycles();

    /* Ask forwarding thread to give us stats. */
    __atomic_store_n(&qconf->stats_read_pending, 1, __ATOMIC_RELAXED);
    rte_spinlock_lock(&qconf->lock);
    __atomic_store_n(&qconf->stats_read_pending, 0, __ATOMIC_RELAXED);

    /* Collect context statistics. */
    stats_period = ctx->state_time - ctx->start_time;
    loop_count = ctx->loop_cnt;

    exec = ctx->exec_time;
    exec_min = ctx->min_exec_time;
    exec_max = ctx->max_exec_time;

    management = ctx->management_time;
    management_min = ctx->min_management_time;
    management_max = ctx->max_management_time;

    rte_jobstats_context_reset(ctx);

    for (i = 0; i < port_cnt; i++) {
        job = &qconf->port_fwd_jobs[i];

        jobs_exec_cnt[i] = job->exec_cnt;
        jobs_period[i] = job->period;

        jobs_exec[i] = job->exec_time;
        jobs_exec_min[i] = job->min_exec_time;
        jobs_exec_max[i] = job->max_exec_time;

        rte_jobstats_reset(job);
    }

    flush_exec_cnt = qconf->flush_job.exec_cnt;
    flush_period = qconf->flush_job.period;
    flush_exec = qconf->flush_job.exec_time;
    flush_exec_min = qconf->flush_job.min_exec_time;
    flush_exec_max = qconf->flush_job.max_exec_time;
    rte_jobstats_reset(&qconf->flush_job);

    idle_exec_cnt = qconf->idle_job.exec_cnt;
    idle_exec = qconf->idle_job.exec_time;
    idle_exec_min = qconf->idle_job.min_exec_time;
    idle_exec_max = qconf->idle_job.max_exec_time;
    rte_jobstats_reset(&qconf->idle_job);

    rte_spinlock_unlock(&qconf->lock);

    exec -= idle_exec;
    busy = exec + management;
    busy_min = exec_min + management_min;
    busy_max = exec_max + management_max;


    collection_time = rte_get_timer_cycles() - collection_time;

#define STAT_FMT "\n%-18s %'14.0f %6.1f%% %'10.0f %'10.0f %'10.0f"

    printf("\n----------------"
            "\nLCore %3u: statistics (time in ns, collected in %'9.0f)"
            "\n%-18s %14s %7s %10s %10s %10s "
            "\n%-18s %'14.0f"
            "\n%-18s %'14" PRIu64
            STAT_FMT /* Exec */
            STAT_FMT /* Management */
            STAT_FMT /* Busy */
            STAT_FMT, /* Idle  */
            lcore_id, cycles_to_ns(collection_time),
            "Stat type", "total", "%total", "avg", "min", "max",
            "Stats duration:", cycles_to_ns(stats_period),
            "Loop count:", loop_count,
            "Exec time",
            cycles_to_ns(exec), exec * 100.0 / stats_period,
            cycles_to_ns(loop_count  ? exec / loop_count : 0),
            cycles_to_ns(exec_min),
            cycles_to_ns(exec_max),
            "Management time",
            cycles_to_ns(management), management * 100.0 / stats_period,
            cycles_to_ns(loop_count  ? management / loop_count : 0),
            cycles_to_ns(management_min),
            cycles_to_ns(management_max),
            "Exec + management",
            cycles_to_ns(busy),  busy * 100.0 / stats_period,
            cycles_to_ns(loop_count ? busy / loop_count : 0),
            cycles_to_ns(busy_min),
            cycles_to_ns(busy_max),
            "Idle (job)",
            cycles_to_ns(idle_exec), idle_exec * 100.0 / stats_period,
            cycles_to_ns(idle_exec_cnt ? idle_exec / idle_exec_cnt : 0),
            cycles_to_ns(idle_exec_min),
            cycles_to_ns(idle_exec_max));

    for (i = 0; i < qconf->n_rx_port; i++) {
        job = &qconf->port_fwd_jobs[i];
        printf("\n\nJob %" PRIu32 ": %-20s "
                "\n%-18s %'14" PRIu64
                "\n%-18s %'14.0f"
                STAT_FMT,
                i, job->name,
                "Exec count:", jobs_exec_cnt[i],
                "Exec period: ", cycles_to_ns(jobs_period[i]),
                "Exec time",
                cycles_to_ns(jobs_exec[i]), jobs_exec[i] * 100.0 / stats_period,
                cycles_to_ns(jobs_exec_cnt[i] ? jobs_exec[i] / jobs_exec_cnt[i]
                        : 0),
                cycles_to_ns(jobs_exec_min[i]),
                cycles_to_ns(jobs_exec_max[i]));
    }

    if (qconf->n_rx_port > 0) {
        job = &qconf->flush_job;
        printf("\n\nJob %" PRIu32 ": %-20s "
                "\n%-18s %'14" PRIu64
                "\n%-18s %'14.0f"
                STAT_FMT,
                i, job->name,
                "Exec count:", flush_exec_cnt,
                "Exec period: ", cycles_to_ns(flush_period),
                "Exec time",
                cycles_to_ns(flush_exec), flush_exec * 100.0 / stats_period,
                cycles_to_ns(flush_exec_cnt ? flush_exec / flush_exec_cnt : 0),
                cycles_to_ns(flush_exec_min),
                cycles_to_ns(flush_exec_max));
    }
}

/* Print out statistics on packets dropped */
static void
show_stats_cb(__rte_unused void *param)
{
    uint64_t total_packets_dropped, total_packets_tx, total_packets_rx;
    unsigned portid, lcore_id;

    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"
            "\nPort statistics ===================================",
            clr, topLeft);

    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
            "\n====================================================",
            total_packets_tx,
            total_packets_rx,
            total_packets_dropped);

    RTE_LCORE_FOREACH(lcore_id) {
        if (lcore_queue_conf[lcore_id].n_rx_port > 0)
            show_lcore_stats(lcore_id);
    }

    printf("\n====================================================\n");

    fflush(stdout);

    rte_eal_alarm_set(timer_period * US_PER_S, show_stats_cb, NULL);
}

/* Start of l2fwd_simple_forward. 8< */
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;
}
/* >8 End of l2fwd_simple_forward. */

static void
l2fwd_job_update_cb(struct rte_jobstats *job, int64_t result)
{
    int64_t err = job->target - result;
    int64_t histeresis = job->target / 8;

    if (err < -histeresis) {
        if (job->min_period + UPDATE_STEP_DOWN < job->period)
            job->period -= UPDATE_STEP_DOWN;
    } else if (err > histeresis) {
        if (job->period + UPDATE_STEP_UP < job->max_period)
            job->period += UPDATE_STEP_UP;
    }
}

static void
l2fwd_fwd_job(__rte_unused struct rte_timer *timer, void *arg)
{
    struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
    struct rte_mbuf *m;

    const uint16_t port_idx = (uintptr_t) arg;
    const unsigned lcore_id = rte_lcore_id();
    struct lcore_queue_conf *qconf = &lcore_queue_conf[lcore_id];
    struct rte_jobstats *job = &qconf->port_fwd_jobs[port_idx];
    const uint16_t portid = qconf->rx_port_list[port_idx];

    uint8_t j;
    uint16_t total_nb_rx;

    rte_jobstats_start(&qconf->jobs_context, job);

    /* Call rx burst 2 times. This allow rte_jobstats logic to see if this
     * function must be called more frequently. */

    /* Call rx burst 2 times. 8< */
    total_nb_rx = rte_eth_rx_burst(portid, 0, pkts_burst,
            MAX_PKT_BURST);

    for (j = 0; j < total_nb_rx; j++) {
        m = pkts_burst[j];
        rte_prefetch0(rte_pktmbuf_mtod(m, void *));
        l2fwd_simple_forward(m, portid);
    }
    /* >8 End of call rx burst 2 times. */

    /* Read second try. 8< */
    if (total_nb_rx == MAX_PKT_BURST) {
        const uint16_t nb_rx = rte_eth_rx_burst(portid, 0, pkts_burst,
                MAX_PKT_BURST);

        total_nb_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);
        }
    }
    /* >8 End of read second try. */

    port_statistics[portid].rx += total_nb_rx;

    /* Adjust period time in which we are running here. 8< */
    if (rte_jobstats_finish(job, total_nb_rx) != 0) {
        rte_timer_reset(&qconf->rx_timers[port_idx], job->period, PERIODICAL,
                lcore_id, l2fwd_fwd_job, arg);
    }
    /* >8 End of adjust period time in which we are running. */
}

/* Draining TX queue of each port. 8< */
static void
l2fwd_flush_job(__rte_unused struct rte_timer *timer, __rte_unused void *arg)
{
    uint64_t now;
    unsigned lcore_id;
    struct lcore_queue_conf *qconf;
    uint16_t portid;
    unsigned i;
    uint32_t sent;
    struct rte_eth_dev_tx_buffer *buffer;

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

    rte_jobstats_start(&qconf->jobs_context, &qconf->flush_job);

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

    for (i = 0; i < qconf->n_rx_port; i++) {
        portid = l2fwd_dst_ports[qconf->rx_port_list[i]];

        if (qconf->next_flush_time[portid] <= now)
            continue;

        buffer = tx_buffer[portid];
        sent = rte_eth_tx_buffer_flush(portid, 0, buffer);
        if (sent)
            port_statistics[portid].tx += sent;

        qconf->next_flush_time[portid] = rte_get_timer_cycles() + drain_tsc;
    }

    /* Pass target to indicate that this job is happy of time interval
     * in which it was called. */
    rte_jobstats_finish(&qconf->flush_job, qconf->flush_job.target);
}
/* >8 End of draining TX queue of each port. */

/* main processing loop */
static void
l2fwd_main_loop(void)
{
    unsigned lcore_id;
    unsigned i, portid;
    struct lcore_queue_conf *qconf;
    uint8_t stats_read_pending = 0;
    uint8_t need_manage;

    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);
    }

    rte_jobstats_init(&qconf->idle_job, "idle", 0, 0, 0, 0);

    /* Minimize impact of stats reading. 8< */
    for (;;) {
        rte_spinlock_lock(&qconf->lock);

        do {
            rte_jobstats_context_start(&qconf->jobs_context);

            /* Do the Idle job:
             * - Read stats_read_pending flag
             * - check if some real job need to be executed
             */
            rte_jobstats_start(&qconf->jobs_context, &qconf->idle_job);

            uint64_t repeats = 0;

            do {
                uint8_t i;
                uint64_t now = rte_get_timer_cycles();

                repeats++;
                need_manage = qconf->flush_timer.expire < now;
                /* Check if we was esked to give a stats. */
                stats_read_pending = __atomic_load_n(&qconf->stats_read_pending,
                        __ATOMIC_RELAXED);
                need_manage |= stats_read_pending;

                for (i = 0; i < qconf->n_rx_port && !need_manage; i++)
                    need_manage = qconf->rx_timers[i].expire < now;

            } while (!need_manage);

            if (likely(repeats != 1))
                rte_jobstats_finish(&qconf->idle_job, qconf->idle_job.target);
            else
                rte_jobstats_abort(&qconf->idle_job);

            rte_timer_manage();
            rte_jobstats_context_finish(&qconf->jobs_context);
        } while (likely(stats_read_pending == 0));

        rte_spinlock_unlock(&qconf->lock);
        rte_pause();
    }
    /* >8 End of minimize impact of stats reading. */
}

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"
           "  -T PERIOD: statistics will be refreshed each PERIOD seconds (0 to disable, 10 default, 86400 maximum)\n"
           "  -l set system default locale instead of default (\"C\" locale) for thousands separator in stats.",
           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;
}

/* 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:l",
                  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);
            if (timer_period < 0) {
                printf("invalid timer period\n");
                l2fwd_usage(prgname);
                return -1;
            }
            break;

        /* For thousands separator in printf. */
        case 'l':
            setlocale(LC_ALL, "");
            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");
        }
    }
}

int
main(int argc, char **argv)
{
    struct lcore_queue_conf *qconf;
    unsigned lcore_id, rx_lcore_id;
    unsigned nb_ports_in_mask = 0;
    int ret;
    char name[RTE_JOBSTATS_NAMESIZE];
    uint16_t nb_ports;
    uint16_t nb_ports_available = 0;
    uint16_t portid, last_port;
    uint8_t i;

    /* Init EAL. 8< */
    ret = rte_eal_init(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Invalid EAL arguments\n");
    argc -= ret;
    argv += ret;

    /* parse application arguments (after the EAL ones) */
    ret = l2fwd_parse_args(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Invalid L2FWD arguments\n");
        /* >8 End of init EAL. */

    rte_timer_subsystem_init();

    /* fetch default timer frequency. */
    hz = rte_get_timer_hz();

    /* Create the mbuf pool. 8< */
    l2fwd_pktmbuf_pool =
        rte_pktmbuf_pool_create("mbuf_pool", NB_MBUF, 32,
            0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
    if (l2fwd_pktmbuf_pool == NULL)
        rte_exit(EXIT_FAILURE, "Cannot init mbuf pool\n");
    /* >8 End of creation of mbuf pool. */
    nb_ports = rte_eth_dev_count_avail();
    if (nb_ports == 0)
        rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");

    /* Reset l2fwd_dst_ports. 8< */
    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++;
    }
    /* >8 End of reset l2fwd_dst_ports. */
    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 = 0;
    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;
        /* Configure the RX and TX queues. 8< */
        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);
        /* >8 End of configuring the RX and TX queues. */

        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 get 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;
        /* RX queue initialization. 8< */
        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);
        /* >8 End of RX queue initialization. */

        /* Init one TX queue on each port. 8< */
        txq_conf = dev_info.default_txconf;
        txq_conf.offloads = local_port_conf.txmode.offloads;
        fflush(stdout);
        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);
        /* >8 End of init one TX queue on each port. */

        /* 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);

        printf("done:\n");

        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);
            return ret;

        }

        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);

    drain_tsc = (hz + US_PER_S - 1) / US_PER_S * BURST_TX_DRAIN_US;

    RTE_LCORE_FOREACH(lcore_id) {
        qconf = &lcore_queue_conf[lcore_id];

        rte_spinlock_init(&qconf->lock);

        if (rte_jobstats_context_init(&qconf->jobs_context) != 0)
            rte_panic("Jobs stats context for core %u init failed\n", lcore_id);

        if (qconf->n_rx_port == 0) {
            RTE_LOG(INFO, L2FWD,
                "lcore %u: no ports so no jobs stats context initialization\n",
                lcore_id);
            continue;
        }
        /* Add flush job. 8< */

        /* Set fixed period by setting min = max = initial period. Set target to
         * zero as it is irrelevant for this job.
         */
        rte_jobstats_init(&qconf->flush_job, "flush", drain_tsc, drain_tsc,
                drain_tsc, 0);

        rte_timer_init(&qconf->flush_timer);
        ret = rte_timer_reset(&qconf->flush_timer, drain_tsc, PERIODICAL,
                lcore_id, &l2fwd_flush_job, NULL);

        if (ret < 0) {
            rte_exit(1, "Failed to reset flush job timer for lcore %u: %s",
                    lcore_id, rte_strerror(-ret));
        }
        /* >8 End of add flush job. */

        for (i = 0; i < qconf->n_rx_port; i++) {
            struct rte_jobstats *job = &qconf->port_fwd_jobs[i];

            portid = qconf->rx_port_list[i];
            printf("Setting forward job for port %u\n", portid);

            snprintf(name, RTE_DIM(name), "port %u fwd", portid);
            /* Setup forward job. 8< */

            /* Set min, max and initial period. Set target to MAX_PKT_BURST as
             * this is desired optimal RX/TX burst size.
             */
            rte_jobstats_init(job, name, 0, drain_tsc, 0, MAX_PKT_BURST);
            rte_jobstats_set_update_period_function(job, l2fwd_job_update_cb);

            rte_timer_init(&qconf->rx_timers[i]);
            ret = rte_timer_reset(&qconf->rx_timers[i], 0, PERIODICAL, lcore_id,
                    &l2fwd_fwd_job, (void *)(uintptr_t)i);

            if (ret < 0) {
                rte_exit(1, "Failed to reset lcore %u port %u job timer: %s",
                        lcore_id, qconf->rx_port_list[i], rte_strerror(-ret));
            }
            /* >8 End of forward job. */
        }
    }

    if (timer_period)
        rte_eal_alarm_set(timer_period * MS_PER_S, show_stats_cb, NULL);
    else
        RTE_LOG(INFO, L2FWD, "Stats display disabled\n");

    /* launch per-lcore init on every lcore */
    rte_eal_mp_remote_launch(l2fwd_launch_one_lcore, NULL, CALL_MAIN);
    RTE_LCORE_FOREACH_WORKER(lcore_id) {
        if (rte_eal_wait_lcore(lcore_id) < 0)
            return -1;
    }

    /* clean up the EAL */
    rte_eal_cleanup();

    return 0;
}