examples/ntb/ntb_fwd.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2019 Intel Corporation
 */
#include <stdint.h>
#include <stdio.h>
#include <inttypes.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <getopt.h>

#include <cmdline_parse_string.h>
#include <cmdline_socket.h>
#include <cmdline.h>
#include <rte_common.h>
#include <rte_rawdev.h>
#include <rte_ethdev.h>
#include <rte_malloc.h>
#include <rte_lcore.h>
#include <rte_cycles.h>
#include <rte_pmd_ntb.h>
#include <rte_mbuf_pool_ops.h>

/* Per-port statistics struct */
struct ntb_port_statistics {
    uint64_t tx;
    uint64_t rx;
} __rte_cache_aligned;
/* Port 0: NTB dev, Port 1: ethdev when iofwd. */
struct ntb_port_statistics ntb_port_stats[2];

struct ntb_fwd_stream {
    uint16_t tx_port;
    uint16_t rx_port;
    uint16_t qp_id;
    uint8_t tx_ntb;  /* If ntb device is tx port. */
};

struct ntb_fwd_lcore_conf {
    uint16_t stream_id;
    uint16_t nb_stream;
    uint8_t stopped;
};

enum ntb_fwd_mode {
    FILE_TRANS = 0,
    RXONLY,
    TXONLY,
    IOFWD,
    MAX_FWD_MODE,
};
static const char *const fwd_mode_s[] = {
    "file-trans",
    "rxonly",
    "txonly",
    "iofwd",
    NULL,
};
static enum ntb_fwd_mode fwd_mode = MAX_FWD_MODE;

static struct ntb_fwd_lcore_conf fwd_lcore_conf[RTE_MAX_LCORE];
static struct ntb_fwd_stream *fwd_streams;

static struct rte_mempool *mbuf_pool;

#define NTB_DRV_NAME_LEN 7
#define MEMPOOL_CACHE_SIZE 256

static uint8_t in_test;
static uint8_t interactive = 1;
static uint16_t eth_port_id = RTE_MAX_ETHPORTS;
static uint16_t dev_id;

/* Number of queues, default set as 1 */
static uint16_t num_queues = 1;
static uint16_t ntb_buf_size = RTE_MBUF_DEFAULT_BUF_SIZE;

/* Configurable number of descriptors */
#define NTB_DEFAULT_NUM_DESCS 1024
static uint16_t nb_desc = NTB_DEFAULT_NUM_DESCS;

static uint16_t tx_free_thresh;

#define NTB_MAX_PKT_BURST 32
#define NTB_DFLT_PKT_BURST 32
static uint16_t pkt_burst = NTB_DFLT_PKT_BURST;

#define BURST_TX_RETRIES 64

static struct rte_eth_conf eth_port_conf = {
    .rxmode = {
        .mq_mode = ETH_MQ_RX_RSS,
        .split_hdr_size = 0,
    },
    .rx_adv_conf = {
        .rss_conf = {
            .rss_key = NULL,
            .rss_hf = ETH_RSS_IP,
        },
    },
    .txmode = {
        .mq_mode = ETH_MQ_TX_NONE,
    },
};

/* *** Help command with introduction. *** */
struct cmd_help_result {
    cmdline_fixed_string_t help;
};

static void
cmd_help_parsed(__rte_unused void *parsed_result,
        struct cmdline *cl,
        __rte_unused void *data)
{
    cmdline_printf(
        cl,
        "\n"
        "The following commands are currently available:\n\n"
        "Control:\n"
        "    quit                                      :"
        " Quit the application.\n"
        "\nTransmission:\n"
        "    send [path]                               :"
        " Send [path] file. Only take effect in file-trans mode\n"
        "    start                                     :"
        " Start transmissions.\n"
        "    stop                                      :"
        " Stop transmissions.\n"
        "    clear/show port stats                     :"
        " Clear/show port stats.\n"
        "    set fwd file-trans/rxonly/txonly/iofwd    :"
        " Set packet forwarding mode.\n"
    );

}

cmdline_parse_token_string_t cmd_help_help =
    TOKEN_STRING_INITIALIZER(struct cmd_help_result, help, "help");

cmdline_parse_inst_t cmd_help = {
    .f = cmd_help_parsed,
    .data = NULL,
    .help_str = "show help",
    .tokens = {
        (void *)&cmd_help_help,
        NULL,
    },
};

/* *** QUIT *** */
struct cmd_quit_result {
    cmdline_fixed_string_t quit;
};

static void
cmd_quit_parsed(__rte_unused void *parsed_result,
        struct cmdline *cl,
        __rte_unused void *data)
{
    struct ntb_fwd_lcore_conf *conf;
    uint32_t lcore_id;

    /* Stop transmission first. */
    RTE_LCORE_FOREACH_SLAVE(lcore_id) {
        conf = &fwd_lcore_conf[lcore_id];

        if (!conf->nb_stream)
            continue;

        if (conf->stopped)
            continue;

        conf->stopped = 1;
    }
    printf("\nWaiting for lcores to finish...\n");
    rte_eal_mp_wait_lcore();
    in_test = 0;

    /* Stop traffic and Close port. */
    rte_rawdev_stop(dev_id);
    rte_rawdev_close(dev_id);
    if (eth_port_id < RTE_MAX_ETHPORTS && fwd_mode == IOFWD) {
        rte_eth_dev_stop(eth_port_id);
        rte_eth_dev_close(eth_port_id);
    }

    cmdline_quit(cl);
}

cmdline_parse_token_string_t cmd_quit_quit =
        TOKEN_STRING_INITIALIZER(struct cmd_quit_result, quit, "quit");

cmdline_parse_inst_t cmd_quit = {
    .f = cmd_quit_parsed,
    .data = NULL,
    .help_str = "exit application",
    .tokens = {
        (void *)&cmd_quit_quit,
        NULL,
    },
};

/* *** SEND FILE PARAMETERS *** */
struct cmd_sendfile_result {
    cmdline_fixed_string_t send_string;
    char filepath[];
};

static void
cmd_sendfile_parsed(void *parsed_result,
            __rte_unused struct cmdline *cl,
            __rte_unused void *data)
{
    struct cmd_sendfile_result *res = parsed_result;
    struct rte_rawdev_buf *pkts_send[NTB_MAX_PKT_BURST];
    struct rte_mbuf *mbuf_send[NTB_MAX_PKT_BURST];
    uint64_t size, count, i, j, nb_burst;
    uint16_t nb_tx, buf_size;
    unsigned int nb_pkt;
    size_t queue_id = 0;
    uint16_t retry = 0;
    uint32_t val;
    FILE *file;
    int ret;

    if (num_queues != 1) {
        printf("File transmission only supports 1 queue.\n");
        num_queues = 1;
    }

    file = fopen(res->filepath, "r");
    if (file == NULL) {
        printf("Fail to open the file.\n");
        return;
    }

    if (fseek(file, 0, SEEK_END) < 0) {
        printf("Fail to get file size.\n");
        fclose(file);
        return;
    }
    size = ftell(file);
    if (fseek(file, 0, SEEK_SET) < 0) {
        printf("Fail to get file size.\n");
        fclose(file);
        return;
    }

    /* Tell remote about the file size. */
    val = size >> 32;
    rte_rawdev_set_attr(dev_id, "spad_user_0", val);
    val = size;
    rte_rawdev_set_attr(dev_id, "spad_user_1", val);
    printf("Sending file, size is %"PRIu64"\n", size);

    for (i = 0; i < NTB_MAX_PKT_BURST; i++)
        pkts_send[i] = (struct rte_rawdev_buf *)
                malloc(sizeof(struct rte_rawdev_buf));

    buf_size = ntb_buf_size - RTE_PKTMBUF_HEADROOM;
    count = (size + buf_size - 1) / buf_size;
    nb_burst = (count + pkt_burst - 1) / pkt_burst;

    for (i = 0; i < nb_burst; i++) {
        val = RTE_MIN(count, pkt_burst);
        if (rte_mempool_get_bulk(mbuf_pool, (void **)mbuf_send,
                    val) == 0) {
            for (nb_pkt = 0; nb_pkt < val; nb_pkt++) {
                mbuf_send[nb_pkt]->port = dev_id;
                mbuf_send[nb_pkt]->data_len =
                fread(rte_pktmbuf_mtod(mbuf_send[nb_pkt],
                    void *), 1, buf_size, file);
                mbuf_send[nb_pkt]->pkt_len =
                    mbuf_send[nb_pkt]->data_len;
                pkts_send[nb_pkt]->buf_addr = mbuf_send[nb_pkt];
            }
        } else {
            for (nb_pkt = 0; nb_pkt < val; nb_pkt++) {
                mbuf_send[nb_pkt] =
                    rte_mbuf_raw_alloc(mbuf_pool);
                if (mbuf_send[nb_pkt] == NULL)
                    break;
                mbuf_send[nb_pkt]->port = dev_id;
                mbuf_send[nb_pkt]->data_len =
                fread(rte_pktmbuf_mtod(mbuf_send[nb_pkt],
                    void *), 1, buf_size, file);
                mbuf_send[nb_pkt]->pkt_len =
                    mbuf_send[nb_pkt]->data_len;
                pkts_send[nb_pkt]->buf_addr = mbuf_send[nb_pkt];
            }
        }

        ret = rte_rawdev_enqueue_buffers(dev_id, pkts_send, nb_pkt,
                        (void *)queue_id);
        if (ret < 0) {
            printf("Enqueue failed with err %d\n", ret);
            for (j = 0; j < nb_pkt; j++)
                rte_pktmbuf_free(mbuf_send[j]);
            goto clean;
        }
        nb_tx = ret;
        while (nb_tx != nb_pkt && retry < BURST_TX_RETRIES) {
            rte_delay_us(1);
            ret = rte_rawdev_enqueue_buffers(dev_id,
                    &pkts_send[nb_tx], nb_pkt - nb_tx,
                    (void *)queue_id);
            if (ret < 0) {
                printf("Enqueue failed with err %d\n", ret);
                for (j = nb_tx; j < nb_pkt; j++)
                    rte_pktmbuf_free(mbuf_send[j]);
                goto clean;
            }
            nb_tx += ret;
        }
        count -= nb_pkt;
    }

    /* Clear register after file sending done. */
    rte_rawdev_set_attr(dev_id, "spad_user_0", 0);
    rte_rawdev_set_attr(dev_id, "spad_user_1", 0);
    printf("Done sending file.\n");

clean:
    for (i = 0; i < NTB_MAX_PKT_BURST; i++)
        free(pkts_send[i]);
    fclose(file);
}

cmdline_parse_token_string_t cmd_send_file_send =
    TOKEN_STRING_INITIALIZER(struct cmd_sendfile_result, send_string,
                 "send");
cmdline_parse_token_string_t cmd_send_file_filepath =
    TOKEN_STRING_INITIALIZER(struct cmd_sendfile_result, filepath, NULL);


cmdline_parse_inst_t cmd_send_file = {
    .f = cmd_sendfile_parsed,
    .data = NULL,
    .help_str = "send <file_path>",
    .tokens = {
        (void *)&cmd_send_file_send,
        (void *)&cmd_send_file_filepath,
        NULL,
    },
};

#define RECV_FILE_LEN 30
static int
start_polling_recv_file(void *param)
{
    struct rte_rawdev_buf *pkts_recv[NTB_MAX_PKT_BURST];
    struct ntb_fwd_lcore_conf *conf = param;
    struct rte_mbuf *mbuf;
    char filepath[RECV_FILE_LEN];
    uint64_t val, size, file_len;
    uint16_t nb_rx, i, file_no;
    size_t queue_id = 0;
    FILE *file;
    int ret;

    for (i = 0; i < NTB_MAX_PKT_BURST; i++)
        pkts_recv[i] = (struct rte_rawdev_buf *)
                malloc(sizeof(struct rte_rawdev_buf));

    file_no = 0;
    while (!conf->stopped) {
        snprintf(filepath, RECV_FILE_LEN, "ntb_recv_file%d", file_no);
        file = fopen(filepath, "w");
        if (file == NULL) {
            printf("Fail to open the file.\n");
            return -EINVAL;
        }

        rte_rawdev_get_attr(dev_id, "spad_user_0", &val);
        size = val << 32;
        rte_rawdev_get_attr(dev_id, "spad_user_1", &val);
        size |= val;

        if (!size) {
            fclose(file);
            continue;
        }

        file_len = 0;
        nb_rx = NTB_MAX_PKT_BURST;
        while (file_len < size && !conf->stopped) {
            ret = rte_rawdev_dequeue_buffers(dev_id, pkts_recv,
                    pkt_burst, (void *)queue_id);
            if (ret < 0) {
                printf("Dequeue failed with err %d\n", ret);
                fclose(file);
                goto clean;
            }
            nb_rx = ret;
            ntb_port_stats[0].rx += nb_rx;
            for (i = 0; i < nb_rx; i++) {
                mbuf = pkts_recv[i]->buf_addr;
                fwrite(rte_pktmbuf_mtod(mbuf, void *), 1,
                    mbuf->data_len, file);
                file_len += mbuf->data_len;
                rte_pktmbuf_free(mbuf);
                pkts_recv[i]->buf_addr = NULL;
            }
        }

        printf("Received file (size: %" PRIu64 ") from peer to %s.\n",
            size, filepath);
        fclose(file);
        file_no++;
    }

clean:
    for (i = 0; i < NTB_MAX_PKT_BURST; i++)
        free(pkts_recv[i]);
    return 0;
}

static int
start_iofwd_per_lcore(void *param)
{
    struct rte_rawdev_buf *ntb_buf[NTB_MAX_PKT_BURST];
    struct rte_mbuf *pkts_burst[NTB_MAX_PKT_BURST];
    struct ntb_fwd_lcore_conf *conf = param;
    struct ntb_fwd_stream fs;
    uint16_t nb_rx, nb_tx;
    int i, j, ret;

    for (i = 0; i < NTB_MAX_PKT_BURST; i++)
        ntb_buf[i] = (struct rte_rawdev_buf *)
                 malloc(sizeof(struct rte_rawdev_buf));

    while (!conf->stopped) {
        for (i = 0; i < conf->nb_stream; i++) {
            fs = fwd_streams[conf->stream_id + i];
            if (fs.tx_ntb) {
                nb_rx = rte_eth_rx_burst(fs.rx_port,
                        fs.qp_id, pkts_burst,
                        pkt_burst);
                if (unlikely(nb_rx == 0))
                    continue;
                for (j = 0; j < nb_rx; j++)
                    ntb_buf[j]->buf_addr = pkts_burst[j];
                ret = rte_rawdev_enqueue_buffers(fs.tx_port,
                        ntb_buf, nb_rx,
                        (void *)(size_t)fs.qp_id);
                if (ret < 0) {
                    printf("Enqueue failed with err %d\n",
                        ret);
                    for (j = 0; j < nb_rx; j++)
                        rte_pktmbuf_free(pkts_burst[j]);
                    goto clean;
                }
                nb_tx = ret;
                ntb_port_stats[0].tx += nb_tx;
                ntb_port_stats[1].rx += nb_rx;
            } else {
                ret = rte_rawdev_dequeue_buffers(fs.rx_port,
                        ntb_buf, pkt_burst,
                        (void *)(size_t)fs.qp_id);
                if (ret < 0) {
                    printf("Dequeue failed with err %d\n",
                        ret);
                    goto clean;
                }
                nb_rx = ret;
                if (unlikely(nb_rx == 0))
                    continue;
                for (j = 0; j < nb_rx; j++)
                    pkts_burst[j] = ntb_buf[j]->buf_addr;
                nb_tx = rte_eth_tx_burst(fs.tx_port,
                    fs.qp_id, pkts_burst, nb_rx);
                ntb_port_stats[1].tx += nb_tx;
                ntb_port_stats[0].rx += nb_rx;
            }
            if (unlikely(nb_tx < nb_rx)) {
                do {
                    rte_pktmbuf_free(pkts_burst[nb_tx]);
                } while (++nb_tx < nb_rx);
            }
        }
    }

clean:
    for (i = 0; i < NTB_MAX_PKT_BURST; i++)
        free(ntb_buf[i]);

    return 0;
}

static int
start_rxonly_per_lcore(void *param)
{
    struct rte_rawdev_buf *ntb_buf[NTB_MAX_PKT_BURST];
    struct ntb_fwd_lcore_conf *conf = param;
    struct ntb_fwd_stream fs;
    uint16_t nb_rx;
    int i, j, ret;

    for (i = 0; i < NTB_MAX_PKT_BURST; i++)
        ntb_buf[i] = (struct rte_rawdev_buf *)
                 malloc(sizeof(struct rte_rawdev_buf));

    while (!conf->stopped) {
        for (i = 0; i < conf->nb_stream; i++) {
            fs = fwd_streams[conf->stream_id + i];
            ret = rte_rawdev_dequeue_buffers(fs.rx_port,
                  ntb_buf, pkt_burst, (void *)(size_t)fs.qp_id);
            if (ret < 0) {
                printf("Dequeue failed with err %d\n", ret);
                goto clean;
            }
            nb_rx = ret;
            if (unlikely(nb_rx == 0))
                continue;
            ntb_port_stats[0].rx += nb_rx;

            for (j = 0; j < nb_rx; j++)
                rte_pktmbuf_free(ntb_buf[j]->buf_addr);
        }
    }

clean:
    for (i = 0; i < NTB_MAX_PKT_BURST; i++)
        free(ntb_buf[i]);

    return 0;
}


static int
start_txonly_per_lcore(void *param)
{
    struct rte_rawdev_buf *ntb_buf[NTB_MAX_PKT_BURST];
    struct rte_mbuf *pkts_burst[NTB_MAX_PKT_BURST];
    struct ntb_fwd_lcore_conf *conf = param;
    struct ntb_fwd_stream fs;
    uint16_t nb_pkt, nb_tx;
    int i, j, ret;

    for (i = 0; i < NTB_MAX_PKT_BURST; i++)
        ntb_buf[i] = (struct rte_rawdev_buf *)
                 malloc(sizeof(struct rte_rawdev_buf));

    while (!conf->stopped) {
        for (i = 0; i < conf->nb_stream; i++) {
            fs = fwd_streams[conf->stream_id + i];
            if (rte_mempool_get_bulk(mbuf_pool, (void **)pkts_burst,
                  pkt_burst) == 0) {
                for (nb_pkt = 0; nb_pkt < pkt_burst; nb_pkt++) {
                    pkts_burst[nb_pkt]->port = dev_id;
                    pkts_burst[nb_pkt]->data_len =
                        pkts_burst[nb_pkt]->buf_len -
                        RTE_PKTMBUF_HEADROOM;
                    pkts_burst[nb_pkt]->pkt_len =
                        pkts_burst[nb_pkt]->data_len;
                    ntb_buf[nb_pkt]->buf_addr =
                        pkts_burst[nb_pkt];
                }
            } else {
                for (nb_pkt = 0; nb_pkt < pkt_burst; nb_pkt++) {
                    pkts_burst[nb_pkt] =
                        rte_pktmbuf_alloc(mbuf_pool);
                    if (pkts_burst[nb_pkt] == NULL)
                        break;
                    pkts_burst[nb_pkt]->port = dev_id;
                    pkts_burst[nb_pkt]->data_len =
                        pkts_burst[nb_pkt]->buf_len -
                        RTE_PKTMBUF_HEADROOM;
                    pkts_burst[nb_pkt]->pkt_len =
                        pkts_burst[nb_pkt]->data_len;
                    ntb_buf[nb_pkt]->buf_addr =
                        pkts_burst[nb_pkt];
                }
            }
            ret = rte_rawdev_enqueue_buffers(fs.tx_port, ntb_buf,
                    nb_pkt, (void *)(size_t)fs.qp_id);
            if (ret < 0) {
                printf("Enqueue failed with err %d\n", ret);
                for (j = 0; j < nb_pkt; j++)
                    rte_pktmbuf_free(pkts_burst[j]);
                goto clean;
            }
            nb_tx = ret;
            ntb_port_stats[0].tx += nb_tx;
            if (unlikely(nb_tx < nb_pkt)) {
                do {
                    rte_pktmbuf_free(pkts_burst[nb_tx]);
                } while (++nb_tx < nb_pkt);
            }
        }
    }

clean:
    for (i = 0; i < NTB_MAX_PKT_BURST; i++)
        free(ntb_buf[i]);

    return 0;
}

static int
ntb_fwd_config_setup(void)
{
    uint16_t i;

    /* Make sure iofwd has valid ethdev. */
    if (fwd_mode == IOFWD && eth_port_id >= RTE_MAX_ETHPORTS) {
        printf("No ethdev, cannot be in iofwd mode.");
        return -EINVAL;
    }

    if (fwd_mode == IOFWD) {
        fwd_streams = rte_zmalloc("ntb_fwd: fwd_streams",
            sizeof(struct ntb_fwd_stream) * num_queues * 2,
            RTE_CACHE_LINE_SIZE);
        for (i = 0; i < num_queues; i++) {
            fwd_streams[i * 2].qp_id = i;
            fwd_streams[i * 2].tx_port = dev_id;
            fwd_streams[i * 2].rx_port = eth_port_id;
            fwd_streams[i * 2].tx_ntb = 1;

            fwd_streams[i * 2 + 1].qp_id = i;
            fwd_streams[i * 2 + 1].tx_port = eth_port_id;
            fwd_streams[i * 2 + 1].rx_port = dev_id;
            fwd_streams[i * 2 + 1].tx_ntb = 0;
        }
        return 0;
    }

    if (fwd_mode == RXONLY || fwd_mode == FILE_TRANS) {
        /* Only support 1 queue in file-trans for in order. */
        if (fwd_mode == FILE_TRANS)
            num_queues = 1;

        fwd_streams = rte_zmalloc("ntb_fwd: fwd_streams",
                sizeof(struct ntb_fwd_stream) * num_queues,
                RTE_CACHE_LINE_SIZE);
        for (i = 0; i < num_queues; i++) {
            fwd_streams[i].qp_id = i;
            fwd_streams[i].tx_port = RTE_MAX_ETHPORTS;
            fwd_streams[i].rx_port = dev_id;
            fwd_streams[i].tx_ntb = 0;
        }
        return 0;
    }

    if (fwd_mode == TXONLY) {
        fwd_streams = rte_zmalloc("ntb_fwd: fwd_streams",
                sizeof(struct ntb_fwd_stream) * num_queues,
                RTE_CACHE_LINE_SIZE);
        for (i = 0; i < num_queues; i++) {
            fwd_streams[i].qp_id = i;
            fwd_streams[i].tx_port = dev_id;
            fwd_streams[i].rx_port = RTE_MAX_ETHPORTS;
            fwd_streams[i].tx_ntb = 1;
        }
    }
    return 0;
}

static void
assign_stream_to_lcores(void)
{
    struct ntb_fwd_lcore_conf *conf;
    struct ntb_fwd_stream *fs;
    uint16_t nb_streams, sm_per_lcore, sm_id, i;
    uint32_t lcore_id;
    uint8_t lcore_num, nb_extra;

    lcore_num = rte_lcore_count();
    /* Exclude master core */
    lcore_num--;

    nb_streams = (fwd_mode == IOFWD) ? num_queues * 2 : num_queues;

    sm_per_lcore = nb_streams / lcore_num;
    nb_extra = nb_streams % lcore_num;
    sm_id = 0;
    i = 0;

    RTE_LCORE_FOREACH_SLAVE(lcore_id) {
        conf = &fwd_lcore_conf[lcore_id];

        if (i < nb_extra) {
            conf->nb_stream = sm_per_lcore + 1;
            conf->stream_id = sm_id;
            sm_id = sm_id + sm_per_lcore + 1;
        } else {
            conf->nb_stream = sm_per_lcore;
            conf->stream_id = sm_id;
            sm_id = sm_id + sm_per_lcore;
        }

        i++;
        if (sm_id >= nb_streams)
            break;
    }

    /* Print packet forwading config. */
    RTE_LCORE_FOREACH_SLAVE(lcore_id) {
        conf = &fwd_lcore_conf[lcore_id];

        if (!conf->nb_stream)
            continue;

        printf("Streams on Lcore %u :\n", lcore_id);
        for (i = 0; i < conf->nb_stream; i++) {
            fs = &fwd_streams[conf->stream_id + i];
            if (fwd_mode == IOFWD)
                printf(" + Stream %u : %s%u RX -> %s%u TX,"
                    " Q=%u\n", conf->stream_id + i,
                    fs->tx_ntb ? "Eth" : "NTB", fs->rx_port,
                    fs->tx_ntb ? "NTB" : "Eth", fs->tx_port,
                    fs->qp_id);
            if (fwd_mode == FILE_TRANS || fwd_mode == RXONLY)
                printf(" + Stream %u : %s%u RX only\n",
                    conf->stream_id, "NTB", fs->rx_port);
            if (fwd_mode == TXONLY)
                printf(" + Stream %u : %s%u TX only\n",
                    conf->stream_id, "NTB", fs->tx_port);
        }
    }
}

static void
start_pkt_fwd(void)
{
    struct ntb_fwd_lcore_conf *conf;
    struct rte_eth_link eth_link;
    uint32_t lcore_id;
    int ret, i;

    ret = ntb_fwd_config_setup();
    if (ret < 0) {
        printf("Cannot start traffic. Please reset fwd mode.\n");
        return;
    }

    /* If using iofwd, checking ethdev link status first. */
    if (fwd_mode == IOFWD) {
        printf("Checking eth link status...\n");
        /* Wait for eth link up at most 100 times. */
        for (i = 0; i < 100; i++) {
            ret = rte_eth_link_get(eth_port_id, &eth_link);
            if (ret < 0) {
                printf("Link get failed with err %d\n", ret);
                return;
            }
            if (eth_link.link_status) {
                printf("Eth%u Link Up. Speed %u Mbps - %s\n",
                    eth_port_id, eth_link.link_speed,
                    (eth_link.link_duplex ==
                     ETH_LINK_FULL_DUPLEX) ?
                    ("full-duplex") : ("half-duplex"));
                break;
            }
        }
        if (!eth_link.link_status) {
            printf("Eth%u link down. Cannot start traffic.\n",
                eth_port_id);
            return;
        }
    }

    assign_stream_to_lcores();
    in_test = 1;

    RTE_LCORE_FOREACH_SLAVE(lcore_id) {
        conf = &fwd_lcore_conf[lcore_id];

        if (!conf->nb_stream)
            continue;

        conf->stopped = 0;
        if (fwd_mode == FILE_TRANS)
            rte_eal_remote_launch(start_polling_recv_file,
                          conf, lcore_id);
        else if (fwd_mode == IOFWD)
            rte_eal_remote_launch(start_iofwd_per_lcore,
                          conf, lcore_id);
        else if (fwd_mode == RXONLY)
            rte_eal_remote_launch(start_rxonly_per_lcore,
                          conf, lcore_id);
        else if (fwd_mode == TXONLY)
            rte_eal_remote_launch(start_txonly_per_lcore,
                          conf, lcore_id);
    }
}

/* *** START FWD PARAMETERS *** */
struct cmd_start_result {
    cmdline_fixed_string_t start;
};

static void
cmd_start_parsed(__rte_unused void *parsed_result,
                __rte_unused struct cmdline *cl,
                __rte_unused void *data)
{
    start_pkt_fwd();
}

cmdline_parse_token_string_t cmd_start_start =
        TOKEN_STRING_INITIALIZER(struct cmd_start_result, start, "start");

cmdline_parse_inst_t cmd_start = {
    .f = cmd_start_parsed,
    .data = NULL,
    .help_str = "start pkt fwd between ntb and ethdev",
    .tokens = {
        (void *)&cmd_start_start,
        NULL,
    },
};

/* *** STOP *** */
struct cmd_stop_result {
    cmdline_fixed_string_t stop;
};

static void
cmd_stop_parsed(__rte_unused void *parsed_result,
        __rte_unused struct cmdline *cl,
        __rte_unused void *data)
{
    struct ntb_fwd_lcore_conf *conf;
    uint32_t lcore_id;

    RTE_LCORE_FOREACH_SLAVE(lcore_id) {
        conf = &fwd_lcore_conf[lcore_id];

        if (!conf->nb_stream)
            continue;

        if (conf->stopped)
            continue;

        conf->stopped = 1;
    }
    printf("\nWaiting for lcores to finish...\n");
    rte_eal_mp_wait_lcore();
    in_test = 0;
    printf("\nDone.\n");
}

cmdline_parse_token_string_t cmd_stop_stop =
        TOKEN_STRING_INITIALIZER(struct cmd_stop_result, stop, "stop");

cmdline_parse_inst_t cmd_stop = {
    .f = cmd_stop_parsed,
    .data = NULL,
    .help_str = "stop: Stop packet forwarding",
    .tokens = {
        (void *)&cmd_stop_stop,
        NULL,
    },
};

static void
ntb_stats_clear(void)
{
    int nb_ids, i;
    uint32_t *ids;

    /* Clear NTB dev stats */
    nb_ids = rte_rawdev_xstats_names_get(dev_id, NULL, 0);
    if (nb_ids  < 0) {
        printf("Error: Cannot get count of xstats\n");
        return;
    }
    ids = malloc(sizeof(uint32_t) * nb_ids);
    for (i = 0; i < nb_ids; i++)
        ids[i] = i;
    rte_rawdev_xstats_reset(dev_id, ids, nb_ids);
    printf("\n  statistics for NTB port %d cleared\n", dev_id);

    /* Clear Ethdev stats if have any */
    if (fwd_mode == IOFWD && eth_port_id != RTE_MAX_ETHPORTS) {
        rte_eth_stats_reset(eth_port_id);
        printf("\n  statistics for ETH port %d cleared\n", eth_port_id);
    }
}

static inline void
ntb_calculate_throughput(uint16_t port) {
    uint64_t diff_pkts_rx, diff_pkts_tx, diff_cycles;
    uint64_t mpps_rx, mpps_tx;
    static uint64_t prev_pkts_rx[2];
    static uint64_t prev_pkts_tx[2];
    static uint64_t prev_cycles[2];

    diff_cycles = prev_cycles[port];
    prev_cycles[port] = rte_rdtsc();
    if (diff_cycles > 0)
        diff_cycles = prev_cycles[port] - diff_cycles;
    diff_pkts_rx = (ntb_port_stats[port].rx > prev_pkts_rx[port]) ?
        (ntb_port_stats[port].rx - prev_pkts_rx[port]) : 0;
    diff_pkts_tx = (ntb_port_stats[port].tx > prev_pkts_tx[port]) ?
        (ntb_port_stats[port].tx - prev_pkts_tx[port]) : 0;
    prev_pkts_rx[port] = ntb_port_stats[port].rx;
    prev_pkts_tx[port] = ntb_port_stats[port].tx;
    mpps_rx = diff_cycles > 0 ?
        diff_pkts_rx * rte_get_tsc_hz() / diff_cycles : 0;
    mpps_tx = diff_cycles > 0 ?
        diff_pkts_tx * rte_get_tsc_hz() / diff_cycles : 0;
    printf("  Throughput (since last show)\n");
    printf("  Rx-pps: %12"PRIu64"\n  Tx-pps: %12"PRIu64"\n",
            mpps_rx, mpps_tx);

}

static void
ntb_stats_display(void)
{
    struct rte_rawdev_xstats_name *xstats_names;
    struct rte_eth_stats stats;
    uint64_t *values;
    uint32_t *ids;
    int nb_ids, i;

    printf("###### statistics for NTB port %d #######\n", dev_id);

    /* Get NTB dev stats and stats names */
    nb_ids = rte_rawdev_xstats_names_get(dev_id, NULL, 0);
    if (nb_ids  < 0) {
        printf("Error: Cannot get count of xstats\n");
        return;
    }
    xstats_names = malloc(sizeof(struct rte_rawdev_xstats_name) * nb_ids);
    if (xstats_names == NULL) {
        printf("Cannot allocate memory for xstats lookup\n");
        return;
    }
    if (nb_ids != rte_rawdev_xstats_names_get(
            dev_id, xstats_names, nb_ids)) {
        printf("Error: Cannot get xstats lookup\n");
        free(xstats_names);
        return;
    }
    ids = malloc(sizeof(uint32_t) * nb_ids);
    for (i = 0; i < nb_ids; i++)
        ids[i] = i;
    values = malloc(sizeof(uint64_t) * nb_ids);
    if (nb_ids != rte_rawdev_xstats_get(dev_id, ids, values, nb_ids)) {
        printf("Error: Unable to get xstats\n");
        free(xstats_names);
        free(values);
        free(ids);
        return;
    }

    /* Display NTB dev stats */
    for (i = 0; i < nb_ids; i++)
        printf("  %s: %"PRIu64"\n", xstats_names[i].name, values[i]);
    ntb_calculate_throughput(0);

    /* Get Ethdev stats if have any */
    if (fwd_mode == IOFWD && eth_port_id != RTE_MAX_ETHPORTS) {
        printf("###### statistics for ETH port %d ######\n",
            eth_port_id);
        rte_eth_stats_get(eth_port_id, &stats);
        printf("  RX-packets: %"PRIu64"\n", stats.ipackets);
        printf("  RX-bytes: %"PRIu64"\n", stats.ibytes);
        printf("  RX-errors: %"PRIu64"\n", stats.ierrors);
        printf("  RX-missed: %"PRIu64"\n", stats.imissed);
        printf("  TX-packets: %"PRIu64"\n", stats.opackets);
        printf("  TX-bytes: %"PRIu64"\n", stats.obytes);
        printf("  TX-errors: %"PRIu64"\n", stats.oerrors);
        ntb_calculate_throughput(1);
    }

    free(xstats_names);
    free(values);
    free(ids);
}

/* *** SHOW/CLEAR PORT STATS *** */
struct cmd_stats_result {
    cmdline_fixed_string_t show;
    cmdline_fixed_string_t port;
    cmdline_fixed_string_t stats;
};

static void
cmd_stats_parsed(void *parsed_result,
         __rte_unused struct cmdline *cl,
         __rte_unused void *data)
{
    struct cmd_stats_result *res = parsed_result;
    if (!strcmp(res->show, "clear"))
        ntb_stats_clear();
    else
        ntb_stats_display();
}

cmdline_parse_token_string_t cmd_stats_show =
    TOKEN_STRING_INITIALIZER(struct cmd_stats_result, show, "show#clear");
cmdline_parse_token_string_t cmd_stats_port =
    TOKEN_STRING_INITIALIZER(struct cmd_stats_result, port, "port");
cmdline_parse_token_string_t cmd_stats_stats =
    TOKEN_STRING_INITIALIZER(struct cmd_stats_result, stats, "stats");


cmdline_parse_inst_t cmd_stats = {
    .f = cmd_stats_parsed,
    .data = NULL,
    .help_str = "show|clear port stats",
    .tokens = {
        (void *)&cmd_stats_show,
        (void *)&cmd_stats_port,
        (void *)&cmd_stats_stats,
        NULL,
    },
};

/* *** SET FORWARDING MODE *** */
struct cmd_set_fwd_mode_result {
    cmdline_fixed_string_t set;
    cmdline_fixed_string_t fwd;
    cmdline_fixed_string_t mode;
};

static void
cmd_set_fwd_mode_parsed(__rte_unused void *parsed_result,
            __rte_unused struct cmdline *cl,
            __rte_unused void *data)
{
    struct cmd_set_fwd_mode_result *res = parsed_result;
    int i;

    if (in_test) {
        printf("Please stop traffic first.\n");
        return;
    }

    for (i = 0; i < MAX_FWD_MODE; i++) {
        if (!strcmp(res->mode, fwd_mode_s[i])) {
            fwd_mode = i;
            return;
        }
    }
    printf("Invalid %s packet forwarding mode.\n", res->mode);
}

cmdline_parse_token_string_t cmd_setfwd_set =
    TOKEN_STRING_INITIALIZER(struct cmd_set_fwd_mode_result, set, "set");
cmdline_parse_token_string_t cmd_setfwd_fwd =
    TOKEN_STRING_INITIALIZER(struct cmd_set_fwd_mode_result, fwd, "fwd");
cmdline_parse_token_string_t cmd_setfwd_mode =
    TOKEN_STRING_INITIALIZER(struct cmd_set_fwd_mode_result, mode,
                "file-trans#iofwd#txonly#rxonly");

cmdline_parse_inst_t cmd_set_fwd_mode = {
    .f = cmd_set_fwd_mode_parsed,
    .data = NULL,
    .help_str = "set forwarding mode as file-trans|rxonly|txonly|iofwd",
    .tokens = {
        (void *)&cmd_setfwd_set,
        (void *)&cmd_setfwd_fwd,
        (void *)&cmd_setfwd_mode,
        NULL,
    },
};

/* list of instructions */
cmdline_parse_ctx_t main_ctx[] = {
    (cmdline_parse_inst_t *)&cmd_help,
    (cmdline_parse_inst_t *)&cmd_send_file,
    (cmdline_parse_inst_t *)&cmd_start,
    (cmdline_parse_inst_t *)&cmd_stop,
    (cmdline_parse_inst_t *)&cmd_stats,
    (cmdline_parse_inst_t *)&cmd_set_fwd_mode,
    (cmdline_parse_inst_t *)&cmd_quit,
    NULL,
};

/* prompt function, called from main on MASTER lcore */
static void
prompt(void)
{
    struct cmdline *cl;

    cl = cmdline_stdin_new(main_ctx, "ntb> ");
    if (cl == NULL)
        return;

    cmdline_interact(cl);
    cmdline_stdin_exit(cl);
}

static void
signal_handler(int signum)
{
    if (signum == SIGINT || signum == SIGTERM) {
        printf("\nSignal %d received, preparing to exit...\n", signum);
        signal(signum, SIG_DFL);
        kill(getpid(), signum);
    }
}

#define OPT_BUF_SIZE         "buf-size"
#define OPT_FWD_MODE         "fwd-mode"
#define OPT_NB_DESC          "nb-desc"
#define OPT_TXFREET          "txfreet"
#define OPT_BURST            "burst"
#define OPT_QP               "qp"

enum {
    /* long options mapped to a short option */
    OPT_NO_ZERO_COPY_NUM = 1,
    OPT_BUF_SIZE_NUM,
    OPT_FWD_MODE_NUM,
    OPT_NB_DESC_NUM,
    OPT_TXFREET_NUM,
    OPT_BURST_NUM,
    OPT_QP_NUM,
};

static const char short_options[] =
    "i" /* interactive mode */
    ;

static const struct option lgopts[] = {
    {OPT_BUF_SIZE,     1, NULL, OPT_BUF_SIZE_NUM     },
    {OPT_FWD_MODE,     1, NULL, OPT_FWD_MODE_NUM     },
    {OPT_NB_DESC,      1, NULL, OPT_NB_DESC_NUM      },
    {OPT_TXFREET,      1, NULL, OPT_TXFREET_NUM      },
    {OPT_BURST,        1, NULL, OPT_BURST_NUM        },
    {OPT_QP,           1, NULL, OPT_QP_NUM           },
    {0,                0, NULL, 0                    }
};

static void
ntb_usage(const char *prgname)
{
    printf("%s [EAL options] -- [options]\n"
           "-i: run in interactive mode.\n"
           "-qp=N: set number of queues as N (N > 0, default: 1).\n"
           "--fwd-mode=N: set fwd mode (N: file-trans | rxonly | "
           "txonly | iofwd, default: file-trans)\n"
           "--buf-size=N: set mbuf dataroom size as N (0 < N < 65535,"
           " default: 2048).\n"
           "--nb-desc=N: set number of descriptors as N (%u <= N <= %u,"
           " default: 1024).\n"
           "--txfreet=N: set tx free thresh for NTB driver as N. (N >= 0)\n"
           "--burst=N: set pkt burst as N (0 < N <= %u default: 32).\n",
           prgname, NTB_MIN_DESC_SIZE, NTB_MAX_DESC_SIZE,
           NTB_MAX_PKT_BURST);
}

static void
ntb_parse_args(int argc, char **argv)
{
    char *prgname = argv[0], **argvopt = argv;
    int opt, opt_idx, n, i;

    while ((opt = getopt_long(argc, argvopt, short_options,
                lgopts, &opt_idx)) != EOF) {
        switch (opt) {
        case 'i':
            printf("Interactive-mode selected.\n");
            interactive = 1;
            break;
        case OPT_QP_NUM:
            n = atoi(optarg);
            if (n > 0)
                num_queues = n;
            else
                rte_exit(EXIT_FAILURE, "q must be > 0.\n");
            break;
        case OPT_BUF_SIZE_NUM:
            n = atoi(optarg);
            if (n > RTE_PKTMBUF_HEADROOM && n <= 0xFFFF)
                ntb_buf_size = n;
            else
                rte_exit(EXIT_FAILURE, "buf-size must be > "
                    "%u and < 65536.\n",
                    RTE_PKTMBUF_HEADROOM);
            break;
        case OPT_FWD_MODE_NUM:
            for (i = 0; i < MAX_FWD_MODE; i++) {
                if (!strcmp(optarg, fwd_mode_s[i])) {
                    fwd_mode = i;
                    break;
                }
            }
            if (i == MAX_FWD_MODE)
                rte_exit(EXIT_FAILURE, "Unsupported mode. "
                "(Should be: file-trans | rxonly | txonly "
                "| iofwd)\n");
            break;
        case OPT_NB_DESC_NUM:
            n = atoi(optarg);
            if (n >= NTB_MIN_DESC_SIZE && n <= NTB_MAX_DESC_SIZE)
                nb_desc = n;
            else
                rte_exit(EXIT_FAILURE, "nb-desc must be within"
                    " [%u, %u].\n", NTB_MIN_DESC_SIZE,
                    NTB_MAX_DESC_SIZE);
            break;
        case OPT_TXFREET_NUM:
            n = atoi(optarg);
            if (n >= 0)
                tx_free_thresh = n;
            else
                rte_exit(EXIT_FAILURE, "txfreet must be"
                    " >= 0\n");
            break;
        case OPT_BURST_NUM:
            n = atoi(optarg);
            if (n > 0 && n <= NTB_MAX_PKT_BURST)
                pkt_burst = n;
            else
                rte_exit(EXIT_FAILURE, "burst must be within "
                    "(0, %u].\n", NTB_MAX_PKT_BURST);
            break;

        default:
            ntb_usage(prgname);
            rte_exit(EXIT_FAILURE,
                 "Command line is incomplete or incorrect.\n");
            break;
        }
    }
}

static void
ntb_mempool_mz_free(__rte_unused struct rte_mempool_memhdr *memhdr,
        void *opaque)
{
    const struct rte_memzone *mz = opaque;
    rte_memzone_free(mz);
}

static struct rte_mempool *
ntb_mbuf_pool_create(uint16_t mbuf_seg_size, uint32_t nb_mbuf,
             struct ntb_dev_info ntb_info,
             struct ntb_dev_config *ntb_conf,
             unsigned int socket_id)
{
    size_t mz_len, total_elt_sz, max_mz_len, left_sz;
    struct rte_pktmbuf_pool_private mbp_priv;
    char pool_name[RTE_MEMPOOL_NAMESIZE];
    char mz_name[RTE_MEMZONE_NAMESIZE];
    const struct rte_memzone *mz;
    struct rte_mempool *mp;
    uint64_t align;
    uint32_t mz_id;
    int ret;

    snprintf(pool_name, sizeof(pool_name), "ntb_mbuf_pool_%u", socket_id);
    mp = rte_mempool_create_empty(pool_name, nb_mbuf,
                      (mbuf_seg_size + sizeof(struct rte_mbuf)),
                      MEMPOOL_CACHE_SIZE,
                      sizeof(struct rte_pktmbuf_pool_private),
                      socket_id, 0);
    if (mp == NULL)
        return NULL;

    if (rte_mempool_set_ops_byname(mp, rte_mbuf_best_mempool_ops(), NULL)) {
        printf("error setting mempool handler\n");
        goto fail;
    }

    memset(&mbp_priv, 0, sizeof(mbp_priv));
    mbp_priv.mbuf_data_room_size = mbuf_seg_size;
    mbp_priv.mbuf_priv_size = 0;
    rte_pktmbuf_pool_init(mp, &mbp_priv);

    ntb_conf->mz_list = rte_zmalloc("ntb_memzone_list",
                sizeof(struct rte_memzone *) *
                ntb_info.mw_cnt, 0);
    if (ntb_conf->mz_list == NULL)
        goto fail;

    /* Put ntb header on mw0. */
    if (ntb_info.mw_size[0] < ntb_info.ntb_hdr_size) {
        printf("mw0 (size: %" PRIu64 ") is not enough for ntb hdr"
               " (size: %u)\n", ntb_info.mw_size[0],
               ntb_info.ntb_hdr_size);
        goto fail;
    }

    total_elt_sz = mp->header_size + mp->elt_size + mp->trailer_size;
    left_sz = total_elt_sz * nb_mbuf;
    for (mz_id = 0; mz_id < ntb_info.mw_cnt; mz_id++) {
        /* If populated mbuf is enough, no need to reserve extra mz. */
        if (!left_sz)
            break;
        snprintf(mz_name, sizeof(mz_name), "ntb_mw_%d", mz_id);
        align = ntb_info.mw_size_align ? ntb_info.mw_size[mz_id] :
            RTE_CACHE_LINE_SIZE;
        /* Reserve ntb header space on memzone 0. */
        max_mz_len = mz_id ? ntb_info.mw_size[mz_id] :
                 ntb_info.mw_size[mz_id] - ntb_info.ntb_hdr_size;
        mz_len = left_sz <= max_mz_len ? left_sz :
            (max_mz_len / total_elt_sz * total_elt_sz);
        if (!mz_len)
            continue;
        mz = rte_memzone_reserve_aligned(mz_name, mz_len, socket_id,
                    RTE_MEMZONE_IOVA_CONTIG, align);
        if (mz == NULL) {
            printf("Cannot allocate %" PRIu64 " aligned memzone"
                " %u\n", align, mz_id);
            goto fail;
        }
        left_sz -= mz_len;

        /* Reserve ntb header space on memzone 0. */
        if (mz_id)
            ret = rte_mempool_populate_iova(mp, mz->addr, mz->iova,
                    mz->len, ntb_mempool_mz_free,
                    (void *)(uintptr_t)mz);
        else
            ret = rte_mempool_populate_iova(mp,
                    (void *)((size_t)mz->addr +
                    ntb_info.ntb_hdr_size),
                    mz->iova + ntb_info.ntb_hdr_size,
                    mz->len - ntb_info.ntb_hdr_size,
                    ntb_mempool_mz_free,
                    (void *)(uintptr_t)mz);
        if (ret <= 0) {
            rte_memzone_free(mz);
            rte_mempool_free(mp);
            return NULL;
        }

        ntb_conf->mz_list[mz_id] = mz;
    }
    if (left_sz) {
        printf("mw space is not enough for mempool.\n");
        goto fail;
    }

    ntb_conf->mz_num = mz_id;
    rte_mempool_obj_iter(mp, rte_pktmbuf_init, NULL);

    return mp;
fail:
    rte_mempool_free(mp);
    return NULL;
}

int
main(int argc, char **argv)
{
    struct rte_eth_conf eth_pconf = eth_port_conf;
    struct rte_rawdev_info ntb_rawdev_conf;
    struct rte_rawdev_info ntb_rawdev_info;
    struct rte_eth_dev_info ethdev_info;
    struct rte_eth_rxconf eth_rx_conf;
    struct rte_eth_txconf eth_tx_conf;
    struct ntb_queue_conf ntb_q_conf;
    struct ntb_dev_config ntb_conf;
    struct ntb_dev_info ntb_info;
    uint64_t ntb_link_status;
    uint32_t nb_mbuf;
    int ret, i;

    signal(SIGINT, signal_handler);
    signal(SIGTERM, signal_handler);

    ret = rte_eal_init(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Error with EAL initialization.\n");

    if (rte_lcore_count() < 2)
        rte_exit(EXIT_FAILURE, "Need at least 2 cores\n");

    /* Find 1st ntb rawdev. */
    for (i = 0; i < RTE_RAWDEV_MAX_DEVS; i++)
        if (rte_rawdevs[i].driver_name &&
            (strncmp(rte_rawdevs[i].driver_name, "raw_ntb",
            NTB_DRV_NAME_LEN) == 0) && (rte_rawdevs[i].attached == 1))
            break;

    if (i == RTE_RAWDEV_MAX_DEVS)
        rte_exit(EXIT_FAILURE, "Cannot find any ntb device.\n");

    dev_id = i;

    argc -= ret;
    argv += ret;

    ntb_parse_args(argc, argv);

    rte_rawdev_set_attr(dev_id, NTB_QUEUE_SZ_NAME, nb_desc);
    printf("Set queue size as %u.\n", nb_desc);
    rte_rawdev_set_attr(dev_id, NTB_QUEUE_NUM_NAME, num_queues);
    printf("Set queue number as %u.\n", num_queues);
    ntb_rawdev_info.dev_private = (rte_rawdev_obj_t)(&ntb_info);
    rte_rawdev_info_get(dev_id, &ntb_rawdev_info);

    nb_mbuf = nb_desc * num_queues * 2 * 2 + rte_lcore_count() *
          MEMPOOL_CACHE_SIZE;
    mbuf_pool = ntb_mbuf_pool_create(ntb_buf_size, nb_mbuf, ntb_info,
                     &ntb_conf, rte_socket_id());
    if (mbuf_pool == NULL)
        rte_exit(EXIT_FAILURE, "Cannot create mbuf pool.\n");

    ntb_conf.num_queues = num_queues;
    ntb_conf.queue_size = nb_desc;
    ntb_rawdev_conf.dev_private = (rte_rawdev_obj_t)(&ntb_conf);
    ret = rte_rawdev_configure(dev_id, &ntb_rawdev_conf);
    if (ret)
        rte_exit(EXIT_FAILURE, "Can't config ntb dev: err=%d, "
            "port=%u\n", ret, dev_id);

    ntb_q_conf.tx_free_thresh = tx_free_thresh;
    ntb_q_conf.nb_desc = nb_desc;
    ntb_q_conf.rx_mp = mbuf_pool;
    for (i = 0; i < num_queues; i++) {
        /* Setup rawdev queue */
        ret = rte_rawdev_queue_setup(dev_id, i, &ntb_q_conf);
        if (ret < 0)
            rte_exit(EXIT_FAILURE,
                "Failed to setup ntb queue %u.\n", i);
    }

    /* Waiting for peer dev up at most 100s.*/
    printf("Checking ntb link status...\n");
    for (i = 0; i < 1000; i++) {
        rte_rawdev_get_attr(dev_id, NTB_LINK_STATUS_NAME,
                    &ntb_link_status);
        if (ntb_link_status) {
            printf("Peer dev ready, ntb link up.\n");
            break;
        }
        rte_delay_ms(100);
    }
    rte_rawdev_get_attr(dev_id, NTB_LINK_STATUS_NAME, &ntb_link_status);
    if (ntb_link_status == 0)
        printf("Expire 100s. Link is not up. Please restart app.\n");

    ret = rte_rawdev_start(dev_id);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "rte_rawdev_start: err=%d, port=%u\n",
            ret, dev_id);

    /* Find 1st ethdev */
    eth_port_id = rte_eth_find_next(0);

    if (eth_port_id < RTE_MAX_ETHPORTS) {
        rte_eth_dev_info_get(eth_port_id, &ethdev_info);
        eth_pconf.rx_adv_conf.rss_conf.rss_hf &=
                ethdev_info.flow_type_rss_offloads;
        ret = rte_eth_dev_configure(eth_port_id, num_queues,
                        num_queues, &eth_pconf);
        if (ret)
            rte_exit(EXIT_FAILURE, "Can't config ethdev: err=%d, "
                "port=%u\n", ret, eth_port_id);
        eth_rx_conf = ethdev_info.default_rxconf;
        eth_rx_conf.offloads = eth_pconf.rxmode.offloads;
        eth_tx_conf = ethdev_info.default_txconf;
        eth_tx_conf.offloads = eth_pconf.txmode.offloads;

        /* Setup ethdev queue if ethdev exists */
        for (i = 0; i < num_queues; i++) {
            ret = rte_eth_rx_queue_setup(eth_port_id, i, nb_desc,
                    rte_eth_dev_socket_id(eth_port_id),
                    &eth_rx_conf, mbuf_pool);
            if (ret < 0)
                rte_exit(EXIT_FAILURE,
                    "Failed to setup eth rxq %u.\n", i);
            ret = rte_eth_tx_queue_setup(eth_port_id, i, nb_desc,
                    rte_eth_dev_socket_id(eth_port_id),
                    &eth_tx_conf);
            if (ret < 0)
                rte_exit(EXIT_FAILURE,
                    "Failed to setup eth txq %u.\n", i);
        }

        ret = rte_eth_dev_start(eth_port_id);
        if (ret < 0)
            rte_exit(EXIT_FAILURE, "rte_eth_dev_start: err=%d, "
                "port=%u\n", ret, eth_port_id);
    }

    /* initialize port stats */
    memset(&ntb_port_stats, 0, sizeof(ntb_port_stats));

    /* Set default fwd mode if user doesn't set it. */
    if (fwd_mode == MAX_FWD_MODE && eth_port_id < RTE_MAX_ETHPORTS) {
        printf("Set default fwd mode as iofwd.\n");
        fwd_mode = IOFWD;
    }
    if (fwd_mode == MAX_FWD_MODE) {
        printf("Set default fwd mode as file-trans.\n");
        fwd_mode = FILE_TRANS;
    }

    if (interactive) {
        sleep(1);
        prompt();
    } else {
        start_pkt_fwd();
    }

    return 0;
}