path: root/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 */
	snprintf(str, sizeof(str), "%s", s);
	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);
}