/*
// Copyright (c) 2010-2017 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/

#include <string.h>
#include <locale.h>
#include <unistd.h>
#include <signal.h>

#include <rte_cycles.h>
#include <rte_atomic.h>
#include <rte_table_hash.h>
#include <rte_memzone.h>
#include <rte_errno.h>

#include "prox_malloc.h"
#include "run.h"
#include "main.h"
#include "log.h"
#include "quit.h"
#include "clock.h"
#include "defines.h"
#include "version.h"
#include "prox_args.h"
#include "prox_assert.h"
#include "prox_cfg.h"
#include "prox_shared.h"
#include "prox_port_cfg.h"
#include "toeplitz.h"
#include "hash_utils.h"
#include "handle_lb_net.h"
#include "prox_cksum.h"
#include "thread_nop.h"
#include "thread_generic.h"
#include "thread_pipeline.h"
#include "cqm.h"

#if RTE_VERSION < RTE_VERSION_NUM(1,8,0,0)
#define RTE_CACHE_LINE_SIZE CACHE_LINE_SIZE
#endif

uint8_t lb_nb_txrings = 0xff;
struct rte_ring *ctrl_rings[RTE_MAX_LCORE*MAX_TASKS_PER_CORE];

static void __attribute__((noreturn)) prox_usage(const char *prgname)
{
	plog_info("\nUsage: %s [-f CONFIG_FILE] [-a|-e] [-m|-s|-i] [-w DEF] [-u] [-t]\n"
		  "\t-f CONFIG_FILE : configuration file to load, ./prox.cfg by default\n"
		  "\t-l LOG_FILE : log file name, ./prox.log by default\n"
		  "\t-p : include PID in log file name if default log file is used\n"
		  "\t-o DISPLAY: Set display to use, can be 'curses' (default), 'cli' or 'none'\n"
		  "\t-v verbosity : initial logging verbosity\n"
		  "\t-a : autostart all cores (by default)\n"
		  "\t-e : don't autostart\n"
		  "\t-n : Create NULL devices instead of using PCI devices, useful together with -i\n"
		  "\t-m : list supported task modes and exit\n"
		  "\t-s : check configuration file syntax and exit\n"
		  "\t-i : check initialization sequence and exit\n"
		  "\t-u : Listen on UDS /tmp/prox.sock\n"
		  "\t-t : Listen on TCP port 8474\n"
		  "\t-q : Pass argument to Lua interpreter, useful to define variables\n"
		  "\t-w : define variable using syntax varname=value\n"
		  "\t     takes precedence over variables defined in CONFIG_FILE\n"
		  "\t-k : Log statistics to file \"stats_dump\" in current directory\n"
		  "\t-d : Run as daemon, the parent process will block until PROX is not initialized\n"
		  "\t-z : Ignore CPU topology, implies -i\n"
		  "\t-r : Change initial screen refresh rate. If set to a lower than 0.001 seconds,\n"
		  "\t	  screen refreshing will be disabled\n"
		  , prgname);
	exit(EXIT_FAILURE);
}

static void check_mixed_normal_pipeline(void)
{
	struct lcore_cfg *lconf = NULL;
	uint32_t lcore_id = -1;

	while (prox_core_next(&lcore_id, 0) == 0) {
		lconf = &lcore_cfg[lcore_id];

		int all_thread_nop = 1;
		int generic = 0;
		int pipeline = 0;
		for (uint8_t task_id = 0; task_id < lconf->n_tasks_all; ++task_id) {
			struct task_args *targ = &lconf->targs[task_id];
			all_thread_nop = all_thread_nop &&
				targ->task_init->thread_x == thread_nop;

			pipeline = pipeline || targ->task_init->thread_x == thread_pipeline;
			generic = generic || targ->task_init->thread_x == thread_generic;
		}
		PROX_PANIC(generic && pipeline, "Can't run both pipeline and normal thread on same core\n");

		if (all_thread_nop)
			lconf->thread_x = thread_nop;
		else {
			lconf->thread_x = thread_generic;
		}
	}
}

static void check_missing_rx(void)
{
	struct lcore_cfg *lconf = NULL;
	struct task_args *targ;

	while (core_targ_next(&lconf, &targ, 0) == 0) {
		PROX_PANIC((targ->flags & TASK_ARG_RX_RING) && targ->rx_rings[0] == 0 && !targ->tx_opt_ring_task,
			   "Configuration Error - Core %u task %u Receiving from ring, but nobody xmitting to this ring\n", lconf->id, targ->id);
		if (targ->nb_rxports == 0 && targ->nb_rxrings == 0) {
			PROX_PANIC(!task_init_flag_set(targ->task_init, TASK_FEATURE_NO_RX),
				   "\tCore %u task %u: no rx_ports and no rx_rings configured while required by mode %s\n", lconf->id, targ->id, targ->task_init->mode_str);
		}
	}
}

static void check_cfg_consistent(void)
{
	check_missing_rx();
	check_mixed_normal_pipeline();
}

static void plog_all_rings(void)
{
	struct lcore_cfg *lconf = NULL;
	struct task_args *targ;

	while (core_targ_next(&lconf, &targ, 0) == 0) {
		for (uint8_t ring_idx = 0; ring_idx < targ->nb_rxrings; ++ring_idx) {
			plog_info("\tCore %u, task %u, rx_ring[%u] %p\n", lconf->id, targ->id, ring_idx, targ->rx_rings[ring_idx]);
		}
	}
}

static int chain_flag_state(struct task_args *targ, uint64_t flag, int is_set)
{
	if (task_init_flag_set(targ->task_init, flag) == is_set)
		return 1;

	int ret = 0;

	for (uint32_t i = 0; i < targ->n_prev_tasks; ++i) {
		ret = chain_flag_state(targ->prev_tasks[i], flag, is_set);
		if (ret)
			return 1;
	}
	return 0;
}

static void configure_if_tx_queues(struct task_args *targ, uint8_t socket)
{
	uint8_t if_port;

	for (uint8_t i = 0; i < targ->nb_txports; ++i) {
		if_port = targ->tx_port_queue[i].port;

		PROX_PANIC(if_port == OUT_DISCARD, "port misconfigured, exiting\n");

		PROX_PANIC(!prox_port_cfg[if_port].active, "\tPort %u not used, skipping...\n", if_port);

		int dsocket = prox_port_cfg[if_port].socket;
		if (dsocket != -1 && dsocket != socket) {
			plog_warn("TX core on socket %d while device on socket %d\n", socket, dsocket);
		}

		if (prox_port_cfg[if_port].tx_ring[0] == '\0') {  // Rings-backed port can use single queue
			targ->tx_port_queue[i].queue = prox_port_cfg[if_port].n_txq;
			prox_port_cfg[if_port].n_txq++;
		} else {
			prox_port_cfg[if_port].n_txq = 1;
			targ->tx_port_queue[i].queue = 0;
		}
		/* Set the ETH_TXQ_FLAGS_NOREFCOUNT flag if none of
		   the tasks up to the task transmitting to the port
		   does not use refcnt. */
		if (!chain_flag_state(targ, TASK_FEATURE_TXQ_FLAGS_REFCOUNT, 1)) {
			prox_port_cfg[if_port].tx_conf.txq_flags |= ETH_TXQ_FLAGS_NOREFCOUNT;
			plog_info("\t\tEnabling No refcnt on port %d\n", if_port);
		}
		else {
			plog_info("\t\tRefcnt used on port %d\n", if_port);
		}

		/* By default OFFLOAD is enabled, but if the whole
		   chain has NOOFFLOADS set all the way until the
		   first task that receives from a port, it will be
		   disabled for the destination port. */
		if (chain_flag_state(targ, TASK_FEATURE_TXQ_FLAGS_NOOFFLOADS, 1)) {
			prox_port_cfg[if_port].tx_conf.txq_flags |= ETH_TXQ_FLAGS_NOOFFLOADS;
			plog_info("\t\tDisabling TX offloads on port %d\n", if_port);
		} else {
			plog_info("\t\tEnabling TX offloads on port %d\n", if_port);
		}

		/* By default NOMULTSEGS is disabled, as drivers/NIC might split packets on RX
		   It should only be enabled when we know for sure that the RX does not split packets.
		   Set the ETH_TXQ_FLAGS_NOMULTSEGS flag if none of the tasks up to the task
		   transmitting to the port does not use multsegs. */
		if (!chain_flag_state(targ, TASK_FEATURE_TXQ_FLAGS_NOMULTSEGS, 0)) {
			prox_port_cfg[if_port].tx_conf.txq_flags |= ETH_TXQ_FLAGS_NOMULTSEGS;
			plog_info("\t\tEnabling No MultiSegs on port %d\n", if_port);
		}
		else {
			plog_info("\t\tMultiSegs used on port %d\n", if_port);
		}
	}
}

static void configure_if_rx_queues(struct task_args *targ, uint8_t socket)
{
	for (int i = 0; i < targ->nb_rxports; i++) {
		uint8_t if_port = targ->rx_port_queue[i].port;

		if (if_port == OUT_DISCARD) {
			return;
		}

		PROX_PANIC(!prox_port_cfg[if_port].active, "Port %u not used, aborting...\n", if_port);

		if(prox_port_cfg[if_port].rx_ring[0] != '\0') {
			prox_port_cfg[if_port].n_rxq = 0;
		}

		targ->rx_port_queue[i].queue = prox_port_cfg[if_port].n_rxq;
		prox_port_cfg[if_port].pool[targ->rx_port_queue[i].queue] = targ->pool;
		prox_port_cfg[if_port].pool_size[targ->rx_port_queue[i].queue] = targ->nb_mbuf - 1;
		prox_port_cfg[if_port].n_rxq++;

		int dsocket = prox_port_cfg[if_port].socket;
		if (dsocket != -1 && dsocket != socket) {
			plog_warn("RX core on socket %d while device on socket %d\n", socket, dsocket);
		}
	}
}

static void configure_if_queues(void)
{
	struct lcore_cfg *lconf = NULL;
	struct task_args *targ;
	uint8_t socket;

	while (core_targ_next(&lconf, &targ, 0) == 0) {
		socket = rte_lcore_to_socket_id(lconf->id);

		configure_if_tx_queues(targ, socket);
		configure_if_rx_queues(targ, socket);
	}
}

static const char *gen_ring_name(void)
{
	static char retval[] = "XX";
	static const char* ring_names =
		"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
		"abcdefghijklmnopqrstuvwxyz"
		"[\\]^_`!\"#$%&'()*+,-./:;<="
		">?@{|}0123456789";
	static int idx2 = 0;

	int idx = idx2;

	retval[0] = ring_names[idx % strlen(ring_names)];
	idx /= strlen(ring_names);
	retval[1] = idx ? ring_names[(idx - 1) % strlen(ring_names)] : 0;

	idx2++;

	return retval;
}

static int task_is_master(struct task_args *targ)
{
	return !targ->lconf;
}

struct ring_init_stats {
	uint32_t n_pkt_rings;
	uint32_t n_ctrl_rings;
	uint32_t n_opt_rings;
};

static uint32_t ring_init_stats_total(const struct ring_init_stats *ris)
{
	return ris->n_pkt_rings + ris->n_ctrl_rings + ris->n_opt_rings;
}

static uint32_t count_incoming_tasks(uint32_t lcore_worker, uint32_t dest_task)
{
	struct lcore_cfg *lconf = NULL;
	struct task_args *targ;
	uint32_t ret = 0;
	struct core_task ct;

	while (core_targ_next(&lconf, &targ, 0) == 0) {
		for (uint8_t idxx = 0; idxx < MAX_PROTOCOLS; ++idxx) {
			for (uint8_t ridx = 0; ridx < targ->core_task_set[idxx].n_elems; ++ridx) {
				ct = targ->core_task_set[idxx].core_task[ridx];

				if (dest_task == ct.task && lcore_worker == ct.core)
					ret++;
			}
		}
	}
	return ret;
}

static struct rte_ring *get_existing_ring(uint32_t lcore_id, uint32_t task_id)
{
	if (!prox_core_active(lcore_id, 0))
		return NULL;

	struct lcore_cfg *lconf = &lcore_cfg[lcore_id];

	if (task_id >= lconf->n_tasks_all)
		return NULL;

	if (lconf->targs[task_id].nb_rxrings == 0)
		return NULL;

	return lconf->targs[task_id].rx_rings[0];
}

static void init_ring_between_tasks(struct lcore_cfg *lconf, struct task_args *starg,
				    const struct core_task ct, uint8_t ring_idx, int idx,
				    struct ring_init_stats *ris)
{
	uint8_t socket;
	struct rte_ring *ring = NULL;
	struct lcore_cfg *lworker;
	struct task_args *dtarg;

	PROX_ASSERT(prox_core_active(ct.core, 0));
	lworker = &lcore_cfg[ct.core];

	/* socket used is the one that the sending core resides on */
	socket = rte_lcore_to_socket_id(lconf->id);

	plog_info("\t\tCreating ring on socket %u with size %u\n"
		  "\t\t\tsource core, task and socket = %u, %u, %u\n"
		  "\t\t\tdestination core, task and socket = %u, %u, %u\n"
		  "\t\t\tdestination worker id = %u\n",
		  socket, starg->ring_size,
		  lconf->id, starg->id, socket,
		  ct.core, ct.task, rte_lcore_to_socket_id(ct.core),
		  ring_idx);

	if (ct.type) {
		struct rte_ring **dring = NULL;

		if (ct.type == CTRL_TYPE_MSG)
			dring = &lworker->ctrl_rings_m[ct.task];
		else if (ct.type == CTRL_TYPE_PKT) {
			dring = &lworker->ctrl_rings_p[ct.task];
			starg->flags |= TASK_ARG_CTRL_RINGS_P;
		}

		if (*dring == NULL)
			ring = rte_ring_create(gen_ring_name(), starg->ring_size, socket, RING_F_SC_DEQ);
		else
			ring = *dring;
		PROX_PANIC(ring == NULL, "Cannot create ring to connect I/O core %u with worker core %u\n", lconf->id, ct.core);

		starg->tx_rings[starg->tot_n_txrings_inited] = ring;
		starg->tot_n_txrings_inited++;
		*dring = ring;
		if (lconf->id == prox_cfg.master) {
			ctrl_rings[ct.core*MAX_TASKS_PER_CORE + ct.task] = ring;
		}

		plog_info("\t\tCore %u task %u to -> core %u task %u ctrl_ring %s %p %s\n",
			  lconf->id, starg->id, ct.core, ct.task, ct.type == CTRL_TYPE_PKT?
			  "pkt" : "msg", ring, ring->name);
		ris->n_ctrl_rings++;
		return;
	}

	dtarg = &lworker->targs[ct.task];
	lworker->targs[ct.task].worker_thread_id = ring_idx;
	PROX_ASSERT(dtarg->flags & TASK_ARG_RX_RING);
	PROX_ASSERT(ct.task < lworker->n_tasks_all);

	/* If all the following conditions are met, the ring can be
	   optimized away. */
	if (!task_is_master(starg) && starg->lconf->id == dtarg->lconf->id &&
	    starg->nb_txrings == 1 && idx == 0 && dtarg->task &&
	    dtarg->tot_rxrings == 1 && starg->task == dtarg->task - 1) {
		plog_info("\t\tOptimizing away ring on core %u from task %u to task %u\n",
			  dtarg->lconf->id, starg->task, dtarg->task);
		/* No need to set up ws_mbuf. */
		starg->tx_opt_ring = 1;
		/* During init of destination task, the buffer in the
		   source task will be initialized. */
		dtarg->tx_opt_ring_task = starg;
		ris->n_opt_rings++;
		++dtarg->nb_rxrings;
		return;
	}

	int ring_created = 1;
	/* Only create multi-producer rings if configured to do so AND
	   there is only one task sending to the task */
	if ((prox_cfg.flags & DSF_MP_RINGS && count_incoming_tasks(ct.core, ct.task) > 1)
		|| (prox_cfg.flags & DSF_ENABLE_BYPASS)) {
		ring = get_existing_ring(ct.core, ct.task);

		if (ring) {
			plog_info("\t\tCore %u task %u creatign MP ring %p to core %u task %u\n",
				  lconf->id, starg->id, ring, ct.core, ct.task);
			ring_created = 0;
		}
		else {
			ring = rte_ring_create(gen_ring_name(), starg->ring_size, socket, RING_F_SC_DEQ);
			plog_info("\t\tCore %u task %u using MP ring %p from core %u task %u\n",
				  lconf->id, starg->id, ring, ct.core, ct.task);
		}
	}
	else
		ring = rte_ring_create(gen_ring_name(), starg->ring_size, socket, RING_F_SP_ENQ | RING_F_SC_DEQ);

	PROX_PANIC(ring == NULL, "Cannot create ring to connect I/O core %u with worker core %u\n", lconf->id, ct.core);

	starg->tx_rings[starg->tot_n_txrings_inited] = ring;
	starg->tot_n_txrings_inited++;

	if (ring_created) {
		PROX_ASSERT(dtarg->nb_rxrings < MAX_RINGS_PER_TASK);
		dtarg->rx_rings[dtarg->nb_rxrings] = ring;
		++dtarg->nb_rxrings;
	}
	dtarg->nb_slave_threads = starg->core_task_set[idx].n_elems;
	dtarg->lb_friend_core = lconf->id;
	dtarg->lb_friend_task = starg->id;
	plog_info("\t\tWorker thread %d has core %d, task %d as a lb friend\n", ct.core, lconf->id, starg->id);
	plog_info("\t\tCore %u task %u tx_ring[%u] -> core %u task %u rx_ring[%u] %p %s %u WT\n",
		  lconf->id, starg->id, ring_idx, ct.core, ct.task, dtarg->nb_rxrings, ring, ring->name,
		  dtarg->nb_slave_threads);
	++ris->n_pkt_rings;
}

static void init_rings(void)
{
	struct lcore_cfg *lconf = NULL;
	struct task_args *starg;
	struct ring_init_stats ris = {0};

	while (core_targ_next(&lconf, &starg, 1) == 0) {
		plog_info("\t*** Initializing rings on core %u, task %u ***\n", lconf->id, starg->id);
		for (uint8_t idx = 0; idx < MAX_PROTOCOLS; ++idx) {
			for (uint8_t ring_idx = 0; ring_idx < starg->core_task_set[idx].n_elems; ++ring_idx) {
				PROX_ASSERT(ring_idx < MAX_WT_PER_LB);
				PROX_ASSERT(starg->tot_n_txrings_inited < MAX_RINGS_PER_TASK);

				struct core_task ct = starg->core_task_set[idx].core_task[ring_idx];
				init_ring_between_tasks(lconf, starg, ct, ring_idx, idx, &ris);
			}
		}
	}

	plog_info("\tInitialized %d rings:\n"
		  "\t\tNumber of packet rings: %u\n"
		  "\t\tNumber of control rings: %u\n"
		  "\t\tNumber of optimized rings: %u\n",
		  ring_init_stats_total(&ris),
		  ris.n_pkt_rings,
		  ris.n_ctrl_rings,
		  ris.n_opt_rings);
}

static void shuffle_mempool(struct rte_mempool* mempool, uint32_t nb_mbuf)
{
	struct rte_mbuf** pkts = prox_zmalloc(nb_mbuf * sizeof(*pkts), rte_socket_id());
	uint64_t got = 0;

	while (rte_mempool_get_bulk(mempool, (void**)(pkts + got), 1) == 0)
		++got;

	while (got) {
		int idx;
		do {
			idx = rand() % nb_mbuf - 1;
		} while (pkts[idx] == 0);

		rte_mempool_put_bulk(mempool, (void**)&pkts[idx], 1);
		pkts[idx] = 0;
		--got;
	};
	prox_free(pkts);
}

static void setup_mempools_unique_per_socket(void)
{
	uint32_t flags = 0;
	char name[64];
	struct lcore_cfg *lconf = NULL;
	struct task_args *targ;

	struct rte_mempool     *pool[MAX_SOCKETS];
	uint32_t mbuf_count[MAX_SOCKETS] = {0};
	uint32_t nb_cache_mbuf[MAX_SOCKETS] = {0};
	uint32_t mbuf_size[MAX_SOCKETS] = {0};

	while (core_targ_next_early(&lconf, &targ, 0) == 0) {
		PROX_PANIC(targ->task_init == NULL, "task_init = NULL, is mode specified for core %d, task %d ?\n", lconf->id, targ->id);
		uint8_t socket = rte_lcore_to_socket_id(lconf->id);
		PROX_ASSERT(socket < MAX_SOCKETS);

		if (targ->mbuf_size_set_explicitely)
			flags = MEMPOOL_F_NO_SPREAD;
		if ((!targ->mbuf_size_set_explicitely) && (targ->task_init->mbuf_size != 0)) {
			targ->mbuf_size = targ->task_init->mbuf_size;
		}
		if (targ->rx_port_queue[0].port != OUT_DISCARD) {
			struct prox_port_cfg* port_cfg = &prox_port_cfg[targ->rx_port_queue[0].port];
			PROX_ASSERT(targ->nb_mbuf != 0);
			mbuf_count[socket] += targ->nb_mbuf;
			if (nb_cache_mbuf[socket] == 0)
				nb_cache_mbuf[socket] = targ->nb_cache_mbuf;
			else {
				PROX_PANIC(nb_cache_mbuf[socket] != targ->nb_cache_mbuf,
					   "all mbuf_cache must have the same size if using a unique mempool per socket\n");
			}
			if (mbuf_size[socket] == 0)
				mbuf_size[socket] = targ->mbuf_size;
			else {
				PROX_PANIC(mbuf_size[socket] != targ->mbuf_size,
					   "all mbuf_size must have the same size if using a unique mempool per socket\n");
			}
			if ((!targ->mbuf_size_set_explicitely) && (strcmp(port_cfg->short_name, "vmxnet3") == 0)) {
				if (mbuf_size[socket] < MBUF_SIZE + RTE_PKTMBUF_HEADROOM)
					mbuf_size[socket] = MBUF_SIZE + RTE_PKTMBUF_HEADROOM;
			}
		}
	}
	for (int i = 0 ; i < MAX_SOCKETS; i++) {
		if (mbuf_count[i] != 0) {
			sprintf(name, "socket_%u_pool", i);
			pool[i] = rte_mempool_create(name,
						     mbuf_count[i] - 1, mbuf_size[i],
						     nb_cache_mbuf[i],
						     sizeof(struct rte_pktmbuf_pool_private),
						     rte_pktmbuf_pool_init, NULL,
						     prox_pktmbuf_init, NULL,
						     i, flags);
			PROX_PANIC(pool[i] == NULL, "\t\tError: cannot create mempool for socket %u\n", i);
			plog_info("\t\tMempool %p size = %u * %u cache %u, socket %d\n", pool[i],
				  mbuf_count[i], mbuf_size[i], nb_cache_mbuf[i], i);

			if (prox_cfg.flags & DSF_SHUFFLE) {
				shuffle_mempool(pool[i], mbuf_count[i]);
			}
		}
	}

	lconf = NULL;
	while (core_targ_next_early(&lconf, &targ, 0) == 0) {
		uint8_t socket = rte_lcore_to_socket_id(lconf->id);

		if (targ->rx_port_queue[0].port != OUT_DISCARD) {
			/* use this pool for the interface that the core is receiving from */
			/* If one core receives from multiple ports, all the ports use the same mempool */
			targ->pool = pool[socket];
			/* Set the number of mbuf to the number of the unique mempool, so that the used and free work */
			targ->nb_mbuf = mbuf_count[socket];
			plog_info("\t\tMempool %p size = %u * %u cache %u, socket %d\n", targ->pool,
				  targ->nb_mbuf, mbuf_size[socket], targ->nb_cache_mbuf, socket);
		}
	}
}

static void setup_mempool_for_rx_task(struct lcore_cfg *lconf, struct task_args *targ)
{
	const uint8_t socket = rte_lcore_to_socket_id(lconf->id);
	struct prox_port_cfg *port_cfg = &prox_port_cfg[targ->rx_port_queue[0].port];
	const struct rte_memzone *mz;
	struct rte_mempool *mp = NULL;
	uint32_t flags = 0;
	char memzone_name[64];
	char name[64];

	/* mbuf size can be set
	 *  - from config file (highest priority, overwriting any other config) - should only be used as workaround
	 *  - through each 'mode', overwriting the default mbuf_size
	 *  - defaulted to MBUF_SIZE i.e. 1518 Bytes
	 * Except is set expliciteky, ensure that size is big enough for vmxnet3 driver
	 */
	if (targ->mbuf_size_set_explicitely) {
		flags = MEMPOOL_F_NO_SPREAD;
		/* targ->mbuf_size already set */
	}
	else if (targ->task_init->mbuf_size != 0) {
		/* mbuf_size not set through config file but set through mode */
		targ->mbuf_size = targ->task_init->mbuf_size;
	}
	else if (strcmp(port_cfg->short_name, "vmxnet3") == 0) {
		if (targ->mbuf_size < MBUF_SIZE + RTE_PKTMBUF_HEADROOM)
			targ->mbuf_size = MBUF_SIZE + RTE_PKTMBUF_HEADROOM;
	}

	/* allocate memory pool for packets */
	PROX_ASSERT(targ->nb_mbuf != 0);

	if (targ->pool_name[0] == '\0') {
		sprintf(name, "core_%u_port_%u_pool", lconf->id, targ->id);
	}

	snprintf(memzone_name, sizeof(memzone_name)-1, "MP_%s", targ->pool_name);
	mz = rte_memzone_lookup(memzone_name);

	if (mz != NULL) {
		mp = (struct rte_mempool*)mz->addr;

		targ->nb_mbuf = mp->size;
		targ->pool = mp;
	}

#ifdef RTE_LIBRTE_IVSHMEM_FALSE
	if (mz != NULL && mp != NULL && mp->phys_addr != mz->ioremap_addr) {
		/* Init mbufs with ioremap_addr for dma */
		mp->phys_addr = mz->ioremap_addr;
		mp->elt_pa[0] = mp->phys_addr + (mp->elt_va_start - (uintptr_t)mp);

		struct prox_pktmbuf_reinit_args init_args;
		init_args.mp = mp;
		init_args.lconf = lconf;

		uint32_t elt_sz = mp->elt_size + mp->header_size + mp->trailer_size;
		rte_mempool_obj_iter((void*)mp->elt_va_start, mp->size, elt_sz, 1,
				     mp->elt_pa, mp->pg_num, mp->pg_shift, prox_pktmbuf_reinit, &init_args);
	}
#endif

	/* Use this pool for the interface that the core is
	   receiving from if one core receives from multiple
	   ports, all the ports use the same mempool */
	if (targ->pool == NULL) {
		plog_info("\t\tCreating mempool with name '%s'\n", name);
		targ->pool = rte_mempool_create(name,
						targ->nb_mbuf - 1, targ->mbuf_size,
						targ->nb_cache_mbuf,
						sizeof(struct rte_pktmbuf_pool_private),
						rte_pktmbuf_pool_init, NULL,
						prox_pktmbuf_init, lconf,
						socket, flags);
	}

	PROX_PANIC(targ->pool == NULL,
		   "\t\tError: cannot create mempool for core %u port %u: %s\n", lconf->id, targ->id, rte_strerror(rte_errno));

	plog_info("\t\tMempool %p size = %u * %u cache %u, socket %d\n", targ->pool,
		  targ->nb_mbuf, targ->mbuf_size, targ->nb_cache_mbuf, socket);
	if (prox_cfg.flags & DSF_SHUFFLE) {
		shuffle_mempool(targ->pool, targ->nb_mbuf);
	}
}

static void setup_mempools_multiple_per_socket(void)
{
	struct lcore_cfg *lconf = NULL;
	struct task_args *targ;

	while (core_targ_next_early(&lconf, &targ, 0) == 0) {
		PROX_PANIC(targ->task_init == NULL, "task_init = NULL, is mode specified for core %d, task %d ?\n", lconf->id, targ->id);
		if (targ->rx_port_queue[0].port == OUT_DISCARD)
			continue;
		setup_mempool_for_rx_task(lconf, targ);
	}
}

static void setup_mempools(void)
{
	if (prox_cfg.flags & UNIQUE_MEMPOOL_PER_SOCKET)
		setup_mempools_unique_per_socket();
	else
		setup_mempools_multiple_per_socket();
}

static void set_task_lconf(void)
{
	struct lcore_cfg *lconf;
	uint32_t lcore_id = -1;

	while(prox_core_next(&lcore_id, 0) == 0) {
		lconf = &lcore_cfg[lcore_id];
		for (uint8_t task_id = 0; task_id < lconf->n_tasks_all; ++task_id) {
			lconf->targs[task_id].lconf = lconf;
		}
	}
}

static void set_dest_threads(void)
{
	struct lcore_cfg *lconf = NULL;
	struct task_args *targ;

	while (core_targ_next(&lconf, &targ, 0) == 0) {
		for (uint8_t idx = 0; idx < MAX_PROTOCOLS; ++idx) {
			for (uint8_t ring_idx = 0; ring_idx < targ->core_task_set[idx].n_elems; ++ring_idx) {
				struct core_task ct = targ->core_task_set[idx].core_task[ring_idx];

				struct task_args *dest_task = core_targ_get(ct.core, ct.task);
				dest_task->prev_tasks[dest_task->n_prev_tasks++] = targ;
			}
		}
	}
}

static void setup_all_task_structs_early_init(void)
{
	struct lcore_cfg *lconf = NULL;
	struct task_args *targ;

	plog_info("\t*** Calling early init on all tasks ***\n");
	while (core_targ_next(&lconf, &targ, 0) == 0) {
		if (targ->task_init->early_init) {
			targ->task_init->early_init(targ);
		}
	}
}

static void setup_all_task_structs(void)
{
	struct lcore_cfg *lconf;
	uint32_t lcore_id = -1;

	while(prox_core_next(&lcore_id, 0) == 0) {
		lconf = &lcore_cfg[lcore_id];
		for (uint8_t task_id = 0; task_id < lconf->n_tasks_all; ++task_id) {
			lconf->tasks_all[task_id] = init_task_struct(&lconf->targs[task_id]);
		}
	}
}

static void init_port_activate(void)
{
	struct lcore_cfg *lconf = NULL;
	struct task_args *targ;
	uint8_t port_id = 0;

	while (core_targ_next_early(&lconf, &targ, 0) == 0) {
		for (int i = 0; i < targ->nb_rxports; i++) {
			port_id = targ->rx_port_queue[i].port;
			prox_port_cfg[port_id].active = 1;
		}

		for (int i = 0; i < targ->nb_txports; i++) {
			port_id = targ->tx_port_queue[i].port;
			prox_port_cfg[port_id].active = 1;
		}
	}
}

/* Initialize cores and allocate mempools */
static void init_lcores(void)
{
	struct lcore_cfg *lconf = 0;
	uint32_t lcore_id = -1;

	while(prox_core_next(&lcore_id, 0) == 0) {
		uint8_t socket = rte_lcore_to_socket_id(lcore_id);
		PROX_PANIC(socket + 1 > MAX_SOCKETS, "Can't configure core %u (on socket %u). MAX_SOCKET is set to %d\n", lcore_id, socket, MAX_SOCKETS);
	}

	/* need to allocate mempools as the first thing to use the lowest possible address range */
	plog_info("=== Initializing mempools ===\n");
	setup_mempools();

	lcore_cfg_alloc_hp();

	set_dest_threads();
	set_task_lconf();

	plog_info("=== Initializing port addresses ===\n");
	init_port_addr();

	plog_info("=== Initializing queue numbers on cores ===\n");
	configure_if_queues();

	plog_info("=== Initializing rings on cores ===\n");
	init_rings();

	plog_info("=== Checking configuration consistency ===\n");
	check_cfg_consistent();

	plog_all_rings();

	setup_all_task_structs_early_init();
	plog_info("=== Initializing tasks ===\n");
	setup_all_task_structs();
}

static int setup_prox(int argc, char **argv)
{
	if (prox_read_config_file() != 0 ||
	    prox_setup_rte(argv[0]) != 0) {
		return -1;
	}

	if (prox_cfg.flags & DSF_CHECK_SYNTAX) {
		plog_info("=== Configuration file syntax has been checked ===\n\n");
		exit(EXIT_SUCCESS);
	}

	init_port_activate();
	plog_info("=== Initializing rte devices ===\n");
	if (!(prox_cfg.flags & DSF_USE_DUMMY_DEVICES))
		init_rte_ring_dev();
	init_rte_dev(prox_cfg.flags & DSF_USE_DUMMY_DEVICES);
	plog_info("=== Calibrating TSC overhead ===\n");
	clock_init();
	plog_info("\tTSC running at %"PRIu64" Hz\n", rte_get_tsc_hz());

	init_lcores();
	plog_info("=== Initializing ports ===\n");
	init_port_all();

	if (prox_cfg.logbuf_size) {
		prox_cfg.logbuf = prox_zmalloc(prox_cfg.logbuf_size, rte_socket_id());
		PROX_PANIC(prox_cfg.logbuf == NULL, "Failed to allocate memory for logbuf with size = %d\n", prox_cfg.logbuf_size);
	}

	if (prox_cfg.flags & DSF_CHECK_INIT) {
		plog_info("=== Initialization sequence completed ===\n\n");
		exit(EXIT_SUCCESS);
	}

	/* Current way that works to disable DPDK logging */
	FILE *f = fopen("/dev/null", "r");
	rte_openlog_stream(f);
	plog_info("=== PROX started ===\n");
	return 0;
}

static int success = 0;
static void siguser_handler(int signal)
{
	if (signal == SIGUSR1)
		success = 1;
	else
		success = 0;
}

static void sigabrt_handler(__attribute__((unused)) int signum)
{
	/* restore default disposition for SIGABRT and SIGPIPE */
	signal(SIGABRT, SIG_DFL);
	signal(SIGPIPE, SIG_DFL);

	/* ignore further Ctrl-C */
	signal(SIGINT, SIG_IGN);

	/* more drastic exit on tedious termination signal */
	plog_info("Aborting...\n");
	if (lcore_cfg != NULL) {
		uint32_t lcore_id;
		pthread_t thread_id, tid0, tid = pthread_self();
		memset(&tid0, 0, sizeof(tid0));

		/* cancel all threads except current one */
		lcore_id = -1;
		while (prox_core_next(&lcore_id, 1) == 0) {
			thread_id = lcore_cfg[lcore_id].thread_id;
			if (pthread_equal(thread_id, tid0))
				continue;
			if (pthread_equal(thread_id, tid))
				continue;
			pthread_cancel(thread_id);
		}

		/* wait for cancelled threads to terminate */
		lcore_id = -1;
		while (prox_core_next(&lcore_id, 1) == 0) {
			thread_id = lcore_cfg[lcore_id].thread_id;
			if (pthread_equal(thread_id, tid0))
				continue;
			if (pthread_equal(thread_id, tid))
				continue;
			pthread_join(thread_id, NULL);
		}
	}

	/* close ncurses */
	display_end();

	/* close ports on termination signal */
	close_ports_atexit();

	/* terminate now */
	abort();
}

static void sigterm_handler(int signum)
{
	/* abort on second Ctrl-C */
	if (signum == SIGINT)
		signal(SIGINT, sigabrt_handler);

	/* gracefully quit on harmless termination signal */
	/* ports will subsequently get closed at resulting exit */
	quit();
}

int main(int argc, char **argv)
{
	/* set en_US locale to print big numbers with ',' */
	setlocale(LC_NUMERIC, "en_US.utf-8");

	if (prox_parse_args(argc, argv) != 0){
		prox_usage(argv[0]);
	}

	plog_init(prox_cfg.log_name, prox_cfg.log_name_pid);
	plog_info("=== " PROGRAM_NAME " " VERSION_STR " ===\n");
	plog_info("\tUsing DPDK %s\n", rte_version() + sizeof(RTE_VER_PREFIX));
	read_rdt_info();

	if (prox_cfg.flags & DSF_LIST_TASK_MODES) {
		/* list supported task modes and exit */
		tasks_list();
		return EXIT_SUCCESS;
	}

	/* close ports at normal exit */
	atexit(close_ports_atexit);
	/* gracefully quit on harmless termination signals */
	signal(SIGHUP, sigterm_handler);
	signal(SIGINT, sigterm_handler);
	signal(SIGQUIT, sigterm_handler);
	signal(SIGTERM, sigterm_handler);
	signal(SIGUSR1, sigterm_handler);
	signal(SIGUSR2, sigterm_handler);
	/* more drastic exit on tedious termination signals */
	signal(SIGABRT, sigabrt_handler);
	signal(SIGPIPE, sigabrt_handler);

	if (prox_cfg.flags & DSF_DAEMON) {
		signal(SIGUSR1, siguser_handler);
		signal(SIGUSR2, siguser_handler);
		plog_info("=== Running in Daemon mode ===\n");
		plog_info("\tForking child and waiting for setup completion\n");

		pid_t ppid = getpid();
		pid_t pid = fork();
		if (pid < 0) {
			plog_err("Failed to fork process to run in daemon mode\n");
			return EXIT_FAILURE;
		}

		if (pid == 0) {
			fclose(stdin);
			fclose(stdout);
			fclose(stderr);
			if (setsid() < 0) {
				kill(ppid, SIGUSR2);
				return EXIT_FAILURE;
			}
			if (setup_prox(argc, argv) != 0) {
				kill(ppid, SIGUSR2);
				return EXIT_FAILURE;
			}
			else {
				kill(ppid, SIGUSR1);
				run(prox_cfg.flags);
				return EXIT_SUCCESS;
			}
		}
		else {
			/* Before exiting the parent, wait until the
			   child process has finished setting up */
			pause();
			if (prox_cfg.logbuf) {
				file_print(prox_cfg.logbuf);
			}
			return success? EXIT_SUCCESS : EXIT_FAILURE;
		}
	}

	if (setup_prox(argc, argv) != 0)
		return EXIT_FAILURE;
	run(prox_cfg.flags);
	return EXIT_SUCCESS;
}