/* 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_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_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
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;

        rte_atomic16_t stats_read_pending;
        rte_spinlock_t lock;
} __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 = 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. */
        rte_atomic16_set(&qconf->stats_read_pending, 1);
        rte_spinlock_lock(&qconf->lock);
        rte_atomic16_set(&qconf->stats_read_pending, 0);

        /* 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);
}

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->d_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->s_addr);

        buffer = tx_buffer[dst_port];
        sent = rte_eth_tx_buffer(dst_port, 0, buffer, m);
        if (sent)
                port_statistics[dst_port].tx += sent;
}

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. */

        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);
        }

        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);
                }
        }

        port_statistics[portid].rx += total_nb_rx;

        /* Adjust period time in which we are running here. */
        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);
        }
}

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 interwal
         * in which it was called. */
        rte_jobstats_finish(&qconf->flush_job, qconf->flush_job.target);
}

/* 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);

        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 =
                                                rte_atomic16_read(&qconf->stats_read_pending);
                                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();
        }
}

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 == 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 */
        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");

        rte_timer_subsystem_init();

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

        /* create the mbuf pool */
        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");

        nb_ports = rte_eth_dev_count_avail();
        if (nb_ports == 0)
                rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\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 = 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 & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
                        local_port_conf.txmode.offloads |=
                                DEV_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 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;
                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 */
                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);

                /* 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: %02X:%02X:%02X:%02X:%02X:%02X\n\n",
                                portid,
                                l2fwd_ports_eth_addr[portid].addr_bytes[0],
                                l2fwd_ports_eth_addr[portid].addr_bytes[1],
                                l2fwd_ports_eth_addr[portid].addr_bytes[2],
                                l2fwd_ports_eth_addr[portid].addr_bytes[3],
                                l2fwd_ports_eth_addr[portid].addr_bytes[4],
                                l2fwd_ports_eth_addr[portid].addr_bytes[5]);

                /* 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.
                 * 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));
                }

                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.
                         * 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));
                        }
                }
        }

        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;
}