examples/load_balancer/config.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <inttypes.h>
#include <sys/types.h>
#include <string.h>
#include <sys/queue.h>
#include <stdarg.h>
#include <errno.h>
#include <getopt.h>

#include <rte_common.h>
#include <rte_byteorder.h>
#include <rte_log.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_random.h>
#include <rte_debug.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_mempool.h>
#include <rte_mbuf.h>
#include <rte_ip.h>
#include <rte_tcp.h>
#include <rte_lpm.h>
#include <rte_string_fns.h>

#include "main.h"

struct app_params app;

static const char usage[] =
"                                                                               \n"
"    load_balancer <EAL PARAMS> -- <APP PARAMS>                                 \n"
"                                                                               \n"
"Application manadatory parameters:                                             \n"
"    --rx \"(PORT, QUEUE, LCORE), ...\" : List of NIC RX ports and queues       \n"
"           handled by the I/O RX lcores                                        \n"
"    --tx \"(PORT, LCORE), ...\" : List of NIC TX ports handled by the I/O TX   \n"
"           lcores                                                              \n"
"    --w \"LCORE, ...\" : List of the worker lcores                             \n"
"    --lpm \"IP / PREFIX => PORT; ...\" : List of LPM rules used by the worker  \n"
"           lcores for packet forwarding                                        \n"
"                                                                               \n"
"Application optional parameters:                                               \n"
"    --rsz \"A, B, C, D\" : Ring sizes                                          \n"
"           A = Size (in number of buffer descriptors) of each of the NIC RX    \n"
"               rings read by the I/O RX lcores (default value is %u)           \n"
"           B = Size (in number of elements) of each of the SW rings used by the\n"
"               I/O RX lcores to send packets to worker lcores (default value is\n"
"               %u)                                                             \n"
"           C = Size (in number of elements) of each of the SW rings used by the\n"
"               worker lcores to send packets to I/O TX lcores (default value is\n"
"               %u)                                                             \n"
"           D = Size (in number of buffer descriptors) of each of the NIC TX    \n"
"               rings written by I/O TX lcores (default value is %u)            \n"
"    --bsz \"(A, B), (C, D), (E, F)\" :  Burst sizes                            \n"
"           A = I/O RX lcore read burst size from NIC RX (default value is %u)  \n"
"           B = I/O RX lcore write burst size to output SW rings (default value \n"
"               is %u)                                                          \n"
"           C = Worker lcore read burst size from input SW rings (default value \n"
"               is %u)                                                          \n"
"           D = Worker lcore write burst size to output SW rings (default value \n"
"               is %u)                                                          \n"
"           E = I/O TX lcore read burst size from input SW rings (default value \n"
"               is %u)                                                          \n"
"           F = I/O TX lcore write burst size to NIC TX (default value is %u)   \n"
"    --pos-lb POS : Position of the 1-byte field within the input packet used by\n"
"           the I/O RX lcores to identify the worker lcore for the current      \n"
"           packet (default value is %u)                                        \n";

void
app_print_usage(void)
{
    printf(usage,
        APP_DEFAULT_NIC_RX_RING_SIZE,
        APP_DEFAULT_RING_RX_SIZE,
        APP_DEFAULT_RING_TX_SIZE,
        APP_DEFAULT_NIC_TX_RING_SIZE,
        APP_DEFAULT_BURST_SIZE_IO_RX_READ,
        APP_DEFAULT_BURST_SIZE_IO_RX_WRITE,
        APP_DEFAULT_BURST_SIZE_WORKER_READ,
        APP_DEFAULT_BURST_SIZE_WORKER_WRITE,
        APP_DEFAULT_BURST_SIZE_IO_TX_READ,
        APP_DEFAULT_BURST_SIZE_IO_TX_WRITE,
        APP_DEFAULT_IO_RX_LB_POS
    );
}

#ifndef APP_ARG_RX_MAX_CHARS
#define APP_ARG_RX_MAX_CHARS     4096
#endif

#ifndef APP_ARG_RX_MAX_TUPLES
#define APP_ARG_RX_MAX_TUPLES    128
#endif

static int
str_to_unsigned_array(
    const char *s, size_t sbuflen,
    char separator,
    unsigned num_vals,
    unsigned *vals)
{
    char str[sbuflen+1];
    char *splits[num_vals];
    char *endptr = NULL;
    int i, num_splits = 0;

    /* copy s so we don't modify original string */
    strlcpy(str, s, sizeof(str));
    num_splits = rte_strsplit(str, sizeof(str), splits, num_vals, separator);

    errno = 0;
    for (i = 0; i < num_splits; i++) {
        vals[i] = strtoul(splits[i], &endptr, 0);
        if (errno != 0 || *endptr != '\0')
            return -1;
    }

    return num_splits;
}

static int
str_to_unsigned_vals(
    const char *s,
    size_t sbuflen,
    char separator,
    unsigned num_vals, ...)
{
    unsigned i, vals[num_vals];
    va_list ap;

    num_vals = str_to_unsigned_array(s, sbuflen, separator, num_vals, vals);

    va_start(ap, num_vals);
    for (i = 0; i < num_vals; i++) {
        unsigned *u = va_arg(ap, unsigned *);
        *u = vals[i];
    }
    va_end(ap);
    return num_vals;
}

static int
parse_arg_rx(const char *arg)
{
    const char *p0 = arg, *p = arg;
    uint32_t n_tuples;

    if (strnlen(arg, APP_ARG_RX_MAX_CHARS + 1) == APP_ARG_RX_MAX_CHARS + 1) {
        return -1;
    }

    n_tuples = 0;
    while ((p = strchr(p0,'(')) != NULL) {
        struct app_lcore_params *lp;
        uint32_t port, queue, lcore, i;

        p0 = strchr(p++, ')');
        if ((p0 == NULL) ||
            (str_to_unsigned_vals(p, p0 - p, ',', 3, &port, &queue, &lcore) !=  3)) {
            return -2;
        }

        /* Enable port and queue for later initialization */
        if ((port >= APP_MAX_NIC_PORTS) || (queue >= APP_MAX_RX_QUEUES_PER_NIC_PORT)) {
            return -3;
        }
        if (app.nic_rx_queue_mask[port][queue] != 0) {
            return -4;
        }
        app.nic_rx_queue_mask[port][queue] = 1;

        /* Check and assign (port, queue) to I/O lcore */
        if (rte_lcore_is_enabled(lcore) == 0) {
            return -5;
        }

        if (lcore >= APP_MAX_LCORES) {
            return -6;
        }
        lp = &app.lcore_params[lcore];
        if (lp->type == e_APP_LCORE_WORKER) {
            return -7;
        }
        lp->type = e_APP_LCORE_IO;
        const size_t n_queues = RTE_MIN(lp->io.rx.n_nic_queues,
                                        RTE_DIM(lp->io.rx.nic_queues));
        for (i = 0; i < n_queues; i ++) {
            if ((lp->io.rx.nic_queues[i].port == port) &&
                (lp->io.rx.nic_queues[i].queue == queue)) {
                return -8;
            }
        }
        if (lp->io.rx.n_nic_queues >= APP_MAX_NIC_RX_QUEUES_PER_IO_LCORE) {
            return -9;
        }
        lp->io.rx.nic_queues[lp->io.rx.n_nic_queues].port = port;
        lp->io.rx.nic_queues[lp->io.rx.n_nic_queues].queue = (uint8_t) queue;
        lp->io.rx.n_nic_queues ++;

        n_tuples ++;
        if (n_tuples > APP_ARG_RX_MAX_TUPLES) {
            return -10;
        }
    }

    if (n_tuples == 0) {
        return -11;
    }

    return 0;
}

#ifndef APP_ARG_TX_MAX_CHARS
#define APP_ARG_TX_MAX_CHARS     4096
#endif

#ifndef APP_ARG_TX_MAX_TUPLES
#define APP_ARG_TX_MAX_TUPLES    128
#endif

static int
parse_arg_tx(const char *arg)
{
    const char *p0 = arg, *p = arg;
    uint32_t n_tuples;

    if (strnlen(arg, APP_ARG_TX_MAX_CHARS + 1) == APP_ARG_TX_MAX_CHARS + 1) {
        return -1;
    }

    n_tuples = 0;
    while ((p = strchr(p0,'(')) != NULL) {
        struct app_lcore_params *lp;
        uint32_t port, lcore, i;

        p0 = strchr(p++, ')');
        if ((p0 == NULL) ||
            (str_to_unsigned_vals(p, p0 - p, ',', 2, &port, &lcore) !=  2)) {
            return -2;
        }

        /* Enable port and queue for later initialization */
        if (port >= APP_MAX_NIC_PORTS) {
            return -3;
        }
        if (app.nic_tx_port_mask[port] != 0) {
            return -4;
        }
        app.nic_tx_port_mask[port] = 1;

        /* Check and assign (port, queue) to I/O lcore */
        if (rte_lcore_is_enabled(lcore) == 0) {
            return -5;
        }

        if (lcore >= APP_MAX_LCORES) {
            return -6;
        }
        lp = &app.lcore_params[lcore];
        if (lp->type == e_APP_LCORE_WORKER) {
            return -7;
        }
        lp->type = e_APP_LCORE_IO;
        const size_t n_ports = RTE_MIN(lp->io.tx.n_nic_ports,
                                       RTE_DIM(lp->io.tx.nic_ports));
        for (i = 0; i < n_ports; i ++) {
            if (lp->io.tx.nic_ports[i] == port) {
                return -8;
            }
        }
        if (lp->io.tx.n_nic_ports >= APP_MAX_NIC_TX_PORTS_PER_IO_LCORE) {
            return -9;
        }
        lp->io.tx.nic_ports[lp->io.tx.n_nic_ports] = port;
        lp->io.tx.n_nic_ports ++;

        n_tuples ++;
        if (n_tuples > APP_ARG_TX_MAX_TUPLES) {
            return -10;
        }
    }

    if (n_tuples == 0) {
        return -11;
    }

    return 0;
}

#ifndef APP_ARG_W_MAX_CHARS
#define APP_ARG_W_MAX_CHARS     4096
#endif

#ifndef APP_ARG_W_MAX_TUPLES
#define APP_ARG_W_MAX_TUPLES    APP_MAX_WORKER_LCORES
#endif

static int
parse_arg_w(const char *arg)
{
    const char *p = arg;
    uint32_t n_tuples;

    if (strnlen(arg, APP_ARG_W_MAX_CHARS + 1) == APP_ARG_W_MAX_CHARS + 1) {
        return -1;
    }

    n_tuples = 0;
    while (*p != 0) {
        struct app_lcore_params *lp;
        uint32_t lcore;

        errno = 0;
        lcore = strtoul(p, NULL, 0);
        if (errno != 0) {
            return -2;
        }

        /* Check and enable worker lcore */
        if (rte_lcore_is_enabled(lcore) == 0) {
            return -3;
        }

        if (lcore >= APP_MAX_LCORES) {
            return -4;
        }
        lp = &app.lcore_params[lcore];
        if (lp->type == e_APP_LCORE_IO) {
            return -5;
        }
        lp->type = e_APP_LCORE_WORKER;

        n_tuples ++;
        if (n_tuples > APP_ARG_W_MAX_TUPLES) {
            return -6;
        }

        p = strchr(p, ',');
        if (p == NULL) {
            break;
        }
        p ++;
    }

    if (n_tuples == 0) {
        return -7;
    }

    if ((n_tuples & (n_tuples - 1)) != 0) {
        return -8;
    }

    return 0;
}

#ifndef APP_ARG_LPM_MAX_CHARS
#define APP_ARG_LPM_MAX_CHARS     4096
#endif

static int
parse_arg_lpm(const char *arg)
{
    const char *p = arg, *p0;

    if (strnlen(arg, APP_ARG_LPM_MAX_CHARS + 1) == APP_ARG_TX_MAX_CHARS + 1) {
        return -1;
    }

    while (*p != 0) {
        uint32_t ip_a, ip_b, ip_c, ip_d, ip, depth, if_out;
        char *endptr;

        p0 = strchr(p, '/');
        if ((p0 == NULL) ||
            (str_to_unsigned_vals(p, p0 - p, '.', 4, &ip_a, &ip_b, &ip_c, &ip_d) != 4)) {
            return -2;
        }

        p = p0 + 1;
        errno = 0;
        depth = strtoul(p, &endptr, 0);
        if (errno != 0 || *endptr != '=') {
            return -3;
        }
        p = strchr(p, '>');
        if (p == NULL) {
            return -4;
        }
        if_out = strtoul(++p, &endptr, 0);
        if (errno != 0 || (*endptr != '\0' && *endptr != ';')) {
            return -5;
        }

        if ((ip_a >= 256) || (ip_b >= 256) || (ip_c >= 256) || (ip_d >= 256) ||
             (depth == 0) || (depth >= 32) ||
             (if_out >= APP_MAX_NIC_PORTS)) {
            return -6;
        }
        ip = (ip_a << 24) | (ip_b << 16) | (ip_c << 8) | ip_d;

        if (app.n_lpm_rules >= APP_MAX_LPM_RULES) {
            return -7;
        }
        app.lpm_rules[app.n_lpm_rules].ip = ip;
        app.lpm_rules[app.n_lpm_rules].depth = (uint8_t) depth;
        app.lpm_rules[app.n_lpm_rules].if_out = (uint8_t) if_out;
        app.n_lpm_rules ++;

        p = strchr(p, ';');
        if (p == NULL) {
            return -8;
        }
        p ++;
    }

    if (app.n_lpm_rules == 0) {
        return -9;
    }

    return 0;
}

static int
app_check_lpm_table(void)
{
    uint32_t rule;

    /* For each rule, check that the output I/F is enabled */
    for (rule = 0; rule < app.n_lpm_rules; rule ++)
    {
        uint32_t port = app.lpm_rules[rule].if_out;

        if (app.nic_tx_port_mask[port] == 0) {
            return -1;
        }
    }

    return 0;
}

static int
app_check_every_rx_port_is_tx_enabled(void)
{
    uint16_t port;

    for (port = 0; port < APP_MAX_NIC_PORTS; port ++) {
        if ((app_get_nic_rx_queues_per_port(port) > 0) && (app.nic_tx_port_mask[port] == 0)) {
            return -1;
        }
    }

    return 0;
}

#ifndef APP_ARG_RSZ_CHARS
#define APP_ARG_RSZ_CHARS 63
#endif

static int
parse_arg_rsz(const char *arg)
{
    if (strnlen(arg, APP_ARG_RSZ_CHARS + 1) == APP_ARG_RSZ_CHARS + 1) {
        return -1;
    }

    if (str_to_unsigned_vals(arg, APP_ARG_RSZ_CHARS, ',', 4,
            &app.nic_rx_ring_size,
            &app.ring_rx_size,
            &app.ring_tx_size,
            &app.nic_tx_ring_size) !=  4)
        return -2;


    if ((app.nic_rx_ring_size == 0) ||
        (app.nic_tx_ring_size == 0) ||
        (app.ring_rx_size == 0) ||
        (app.ring_tx_size == 0)) {
        return -3;
    }

    return 0;
}

#ifndef APP_ARG_BSZ_CHARS
#define APP_ARG_BSZ_CHARS 63
#endif

static int
parse_arg_bsz(const char *arg)
{
    const char *p = arg, *p0;
    if (strnlen(arg, APP_ARG_BSZ_CHARS + 1) == APP_ARG_BSZ_CHARS + 1) {
        return -1;
    }

    p0 = strchr(p++, ')');
    if ((p0 == NULL) ||
        (str_to_unsigned_vals(p, p0 - p, ',', 2, &app.burst_size_io_rx_read, &app.burst_size_io_rx_write) !=  2)) {
        return -2;
    }

    p = strchr(p0, '(');
    if (p == NULL) {
        return -3;
    }

    p0 = strchr(p++, ')');
    if ((p0 == NULL) ||
        (str_to_unsigned_vals(p, p0 - p, ',', 2, &app.burst_size_worker_read, &app.burst_size_worker_write) !=  2)) {
        return -4;
    }

    p = strchr(p0, '(');
    if (p == NULL) {
        return -5;
    }

    p0 = strchr(p++, ')');
    if ((p0 == NULL) ||
        (str_to_unsigned_vals(p, p0 - p, ',', 2, &app.burst_size_io_tx_read, &app.burst_size_io_tx_write) !=  2)) {
        return -6;
    }

    if ((app.burst_size_io_rx_read == 0) ||
        (app.burst_size_io_rx_write == 0) ||
        (app.burst_size_worker_read == 0) ||
        (app.burst_size_worker_write == 0) ||
        (app.burst_size_io_tx_read == 0) ||
        (app.burst_size_io_tx_write == 0)) {
        return -7;
    }

    if ((app.burst_size_io_rx_read > APP_MBUF_ARRAY_SIZE) ||
        (app.burst_size_io_rx_write > APP_MBUF_ARRAY_SIZE) ||
        (app.burst_size_worker_read > APP_MBUF_ARRAY_SIZE) ||
        (app.burst_size_worker_write > APP_MBUF_ARRAY_SIZE) ||
        ((2 * app.burst_size_io_tx_read) > APP_MBUF_ARRAY_SIZE) ||
        (app.burst_size_io_tx_write > APP_MBUF_ARRAY_SIZE)) {
        return -8;
    }

    return 0;
}

#ifndef APP_ARG_NUMERICAL_SIZE_CHARS
#define APP_ARG_NUMERICAL_SIZE_CHARS 15
#endif

static int
parse_arg_pos_lb(const char *arg)
{
    uint32_t x;
    char *endpt;

    if (strnlen(arg, APP_ARG_NUMERICAL_SIZE_CHARS + 1) == APP_ARG_NUMERICAL_SIZE_CHARS + 1) {
        return -1;
    }

    errno = 0;
    x = strtoul(arg, &endpt, 10);
    if (errno != 0 || endpt == arg || *endpt != '\0'){
        return -2;
    }

    if (x >= 64) {
        return -3;
    }

    app.pos_lb = (uint8_t) x;

    return 0;
}

/* Parse the argument given in the command line of the application */
int
app_parse_args(int argc, char **argv)
{
    int opt, ret;
    char **argvopt;
    int option_index;
    char *prgname = argv[0];
    static struct option lgopts[] = {
        {"rx", 1, 0, 0},
        {"tx", 1, 0, 0},
        {"w", 1, 0, 0},
        {"lpm", 1, 0, 0},
        {"rsz", 1, 0, 0},
        {"bsz", 1, 0, 0},
        {"pos-lb", 1, 0, 0},
        {NULL, 0, 0, 0}
    };
    uint32_t arg_w = 0;
    uint32_t arg_rx = 0;
    uint32_t arg_tx = 0;
    uint32_t arg_lpm = 0;
    uint32_t arg_rsz = 0;
    uint32_t arg_bsz = 0;
    uint32_t arg_pos_lb = 0;

    argvopt = argv;

    while ((opt = getopt_long(argc, argvopt, "",
                lgopts, &option_index)) != EOF) {

        switch (opt) {
        /* long options */
        case 0:
            if (!strcmp(lgopts[option_index].name, "rx")) {
                arg_rx = 1;
                ret = parse_arg_rx(optarg);
                if (ret) {
                    printf("Incorrect value for --rx argument (%d)\n", ret);
                    return -1;
                }
            }
            if (!strcmp(lgopts[option_index].name, "tx")) {
                arg_tx = 1;
                ret = parse_arg_tx(optarg);
                if (ret) {
                    printf("Incorrect value for --tx argument (%d)\n", ret);
                    return -1;
                }
            }
            if (!strcmp(lgopts[option_index].name, "w")) {
                arg_w = 1;
                ret = parse_arg_w(optarg);
                if (ret) {
                    printf("Incorrect value for --w argument (%d)\n", ret);
                    return -1;
                }
            }
            if (!strcmp(lgopts[option_index].name, "lpm")) {
                arg_lpm = 1;
                ret = parse_arg_lpm(optarg);
                if (ret) {
                    printf("Incorrect value for --lpm argument (%d)\n", ret);
                    return -1;
                }
            }
            if (!strcmp(lgopts[option_index].name, "rsz")) {
                arg_rsz = 1;
                ret = parse_arg_rsz(optarg);
                if (ret) {
                    printf("Incorrect value for --rsz argument (%d)\n", ret);
                    return -1;
                }
            }
            if (!strcmp(lgopts[option_index].name, "bsz")) {
                arg_bsz = 1;
                ret = parse_arg_bsz(optarg);
                if (ret) {
                    printf("Incorrect value for --bsz argument (%d)\n", ret);
                    return -1;
                }
            }
            if (!strcmp(lgopts[option_index].name, "pos-lb")) {
                arg_pos_lb = 1;
                ret = parse_arg_pos_lb(optarg);
                if (ret) {
                    printf("Incorrect value for --pos-lb argument (%d)\n", ret);
                    return -1;
                }
            }
            break;

        default:
            return -1;
        }
    }

    /* Check that all mandatory arguments are provided */
    if ((arg_rx == 0) || (arg_tx == 0) || (arg_w == 0) || (arg_lpm == 0)){
        printf("Not all mandatory arguments are present\n");
        return -1;
    }

    /* Assign default values for the optional arguments not provided */
    if (arg_rsz == 0) {
        app.nic_rx_ring_size = APP_DEFAULT_NIC_RX_RING_SIZE;
        app.nic_tx_ring_size = APP_DEFAULT_NIC_TX_RING_SIZE;
        app.ring_rx_size = APP_DEFAULT_RING_RX_SIZE;
        app.ring_tx_size = APP_DEFAULT_RING_TX_SIZE;
    }

    if (arg_bsz == 0) {
        app.burst_size_io_rx_read = APP_DEFAULT_BURST_SIZE_IO_RX_READ;
        app.burst_size_io_rx_write = APP_DEFAULT_BURST_SIZE_IO_RX_WRITE;
        app.burst_size_io_tx_read = APP_DEFAULT_BURST_SIZE_IO_TX_READ;
        app.burst_size_io_tx_write = APP_DEFAULT_BURST_SIZE_IO_TX_WRITE;
        app.burst_size_worker_read = APP_DEFAULT_BURST_SIZE_WORKER_READ;
        app.burst_size_worker_write = APP_DEFAULT_BURST_SIZE_WORKER_WRITE;
    }

    if (arg_pos_lb == 0) {
        app.pos_lb = APP_DEFAULT_IO_RX_LB_POS;
    }

    /* Check cross-consistency of arguments */
    if ((ret = app_check_lpm_table()) < 0) {
        printf("At least one LPM rule is inconsistent (%d)\n", ret);
        return -1;
    }
    if (app_check_every_rx_port_is_tx_enabled() < 0) {
        printf("On LPM lookup miss, packet is sent back on the input port.\n");
        printf("At least one RX port is not enabled for TX.\n");
        return -2;
    }

    if (optind >= 0)
        argv[optind - 1] = prgname;

    ret = optind - 1;
    optind = 1; /* reset getopt lib */
    return ret;
}

int
app_get_nic_rx_queues_per_port(uint16_t port)
{
    uint32_t i, count;

    if (port >= APP_MAX_NIC_PORTS) {
        return -1;
    }

    count = 0;
    for (i = 0; i < APP_MAX_RX_QUEUES_PER_NIC_PORT; i ++) {
        if (app.nic_rx_queue_mask[port][i] == 1) {
            count ++;
        }
    }

    return count;
}

int
app_get_lcore_for_nic_rx(uint16_t port, uint8_t queue, uint32_t *lcore_out)
{
    uint32_t lcore;

    for (lcore = 0; lcore < APP_MAX_LCORES; lcore ++) {
        struct app_lcore_params_io *lp = &app.lcore_params[lcore].io;
        uint32_t i;

        if (app.lcore_params[lcore].type != e_APP_LCORE_IO) {
            continue;
        }

        const size_t n_queues = RTE_MIN(lp->rx.n_nic_queues,
                                        RTE_DIM(lp->rx.nic_queues));
        for (i = 0; i < n_queues; i ++) {
            if ((lp->rx.nic_queues[i].port == port) &&
                (lp->rx.nic_queues[i].queue == queue)) {
                *lcore_out = lcore;
                return 0;
            }
        }
    }

    return -1;
}

int
app_get_lcore_for_nic_tx(uint16_t port, uint32_t *lcore_out)
{
    uint32_t lcore;

    for (lcore = 0; lcore < APP_MAX_LCORES; lcore ++) {
        struct app_lcore_params_io *lp = &app.lcore_params[lcore].io;
        uint32_t i;

        if (app.lcore_params[lcore].type != e_APP_LCORE_IO) {
            continue;
        }

        const size_t n_ports = RTE_MIN(lp->tx.n_nic_ports,
                                       RTE_DIM(lp->tx.nic_ports));
        for (i = 0; i < n_ports; i ++) {
            if (lp->tx.nic_ports[i] == port) {
                *lcore_out = lcore;
                return 0;
            }
        }
    }

    return -1;
}

int
app_is_socket_used(uint32_t socket)
{
    uint32_t lcore;

    for (lcore = 0; lcore < APP_MAX_LCORES; lcore ++) {
        if (app.lcore_params[lcore].type == e_APP_LCORE_DISABLED) {
            continue;
        }

        if (socket == rte_lcore_to_socket_id(lcore)) {
            return 1;
        }
    }

    return 0;
}

uint32_t
app_get_lcores_io_rx(void)
{
    uint32_t lcore, count;

    count = 0;
    for (lcore = 0; lcore < APP_MAX_LCORES; lcore ++) {
        struct app_lcore_params_io *lp_io = &app.lcore_params[lcore].io;

        if ((app.lcore_params[lcore].type != e_APP_LCORE_IO) ||
            (lp_io->rx.n_nic_queues == 0)) {
            continue;
        }

        count ++;
    }

    return count;
}

uint32_t
app_get_lcores_worker(void)
{
    uint32_t lcore, count;

    count = 0;
    for (lcore = 0; lcore < APP_MAX_LCORES; lcore ++) {
        if (app.lcore_params[lcore].type != e_APP_LCORE_WORKER) {
            continue;
        }

        count ++;
    }

    if (count > APP_MAX_WORKER_LCORES) {
        rte_panic("Algorithmic error (too many worker lcores)\n");
        return 0;
    }

    return count;
}

void
app_print_params(void)
{
    unsigned port, queue, lcore, rule, i, j;

    /* Print NIC RX configuration */
    printf("NIC RX ports: ");
    for (port = 0; port < APP_MAX_NIC_PORTS; port ++) {
        uint32_t n_rx_queues = app_get_nic_rx_queues_per_port(port);

        if (n_rx_queues == 0) {
            continue;
        }

        printf("%u (", port);
        for (queue = 0; queue < APP_MAX_RX_QUEUES_PER_NIC_PORT; queue ++) {
            if (app.nic_rx_queue_mask[port][queue] == 1) {
                printf("%u ", queue);
            }
        }
        printf(")  ");
    }
    printf(";\n");

    /* Print I/O lcore RX params */
    for (lcore = 0; lcore < APP_MAX_LCORES; lcore ++) {
        struct app_lcore_params_io *lp = &app.lcore_params[lcore].io;

        if ((app.lcore_params[lcore].type != e_APP_LCORE_IO) ||
            (lp->rx.n_nic_queues == 0)) {
            continue;
        }

        printf("I/O lcore %u (socket %u): ", lcore, rte_lcore_to_socket_id(lcore));

        printf("RX ports  ");
        for (i = 0; i < lp->rx.n_nic_queues; i ++) {
            printf("(%u, %u)  ",
                (unsigned) lp->rx.nic_queues[i].port,
                (unsigned) lp->rx.nic_queues[i].queue);
        }
        printf("; ");

        printf("Output rings  ");
        for (i = 0; i < lp->rx.n_rings; i ++) {
            printf("%p  ", lp->rx.rings[i]);
        }
        printf(";\n");
    }

    /* Print worker lcore RX params */
    for (lcore = 0; lcore < APP_MAX_LCORES; lcore ++) {
        struct app_lcore_params_worker *lp = &app.lcore_params[lcore].worker;

        if (app.lcore_params[lcore].type != e_APP_LCORE_WORKER) {
            continue;
        }

        printf("Worker lcore %u (socket %u) ID %u: ",
            lcore,
            rte_lcore_to_socket_id(lcore),
            (unsigned)lp->worker_id);

        printf("Input rings  ");
        for (i = 0; i < lp->n_rings_in; i ++) {
            printf("%p  ", lp->rings_in[i]);
        }

        printf(";\n");
    }

    printf("\n");

    /* Print NIC TX configuration */
    printf("NIC TX ports:  ");
    for (port = 0; port < APP_MAX_NIC_PORTS; port ++) {
        if (app.nic_tx_port_mask[port] == 1) {
            printf("%u  ", port);
        }
    }
    printf(";\n");

    /* Print I/O TX lcore params */
    for (lcore = 0; lcore < APP_MAX_LCORES; lcore ++) {
        struct app_lcore_params_io *lp = &app.lcore_params[lcore].io;
        uint32_t n_workers = app_get_lcores_worker();

        if ((app.lcore_params[lcore].type != e_APP_LCORE_IO) ||
             (lp->tx.n_nic_ports == 0)) {
            continue;
        }

        printf("I/O lcore %u (socket %u): ", lcore, rte_lcore_to_socket_id(lcore));

        printf("Input rings per TX port  ");
        for (i = 0; i < lp->tx.n_nic_ports; i ++) {
            port = lp->tx.nic_ports[i];

            printf("%u (", port);
            for (j = 0; j < n_workers; j ++) {
                printf("%p  ", lp->tx.rings[port][j]);
            }
            printf(")  ");

        }

        printf(";\n");
    }

    /* Print worker lcore TX params */
    for (lcore = 0; lcore < APP_MAX_LCORES; lcore ++) {
        struct app_lcore_params_worker *lp = &app.lcore_params[lcore].worker;

        if (app.lcore_params[lcore].type != e_APP_LCORE_WORKER) {
            continue;
        }

        printf("Worker lcore %u (socket %u) ID %u: \n",
            lcore,
            rte_lcore_to_socket_id(lcore),
            (unsigned)lp->worker_id);

        printf("Output rings per TX port  ");
        for (port = 0; port < APP_MAX_NIC_PORTS; port ++) {
            if (lp->rings_out[port] != NULL) {
                printf("%u (%p)  ", port, lp->rings_out[port]);
            }
        }

        printf(";\n");
    }

    /* Print LPM rules */
    printf("LPM rules: \n");
    for (rule = 0; rule < app.n_lpm_rules; rule ++) {
        uint32_t ip = app.lpm_rules[rule].ip;
        uint8_t depth = app.lpm_rules[rule].depth;
        uint8_t if_out = app.lpm_rules[rule].if_out;

        printf("\t%u: %u.%u.%u.%u/%u => %u;\n",
            rule,
            (unsigned) (ip & 0xFF000000) >> 24,
            (unsigned) (ip & 0x00FF0000) >> 16,
            (unsigned) (ip & 0x0000FF00) >> 8,
            (unsigned) ip & 0x000000FF,
            (unsigned) depth,
            (unsigned) if_out
        );
    }

    /* Rings */
    printf("Ring sizes: NIC RX = %u; Worker in = %u; Worker out = %u; NIC TX = %u;\n",
        (unsigned) app.nic_rx_ring_size,
        (unsigned) app.ring_rx_size,
        (unsigned) app.ring_tx_size,
        (unsigned) app.nic_tx_ring_size);

    /* Bursts */
    printf("Burst sizes: I/O RX (rd = %u, wr = %u); Worker (rd = %u, wr = %u); I/O TX (rd = %u, wr = %u)\n",
        (unsigned) app.burst_size_io_rx_read,
        (unsigned) app.burst_size_io_rx_write,
        (unsigned) app.burst_size_worker_read,
        (unsigned) app.burst_size_worker_write,
        (unsigned) app.burst_size_io_tx_read,
        (unsigned) app.burst_size_io_tx_write);
}