/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
 *   Copyright(c) 2014 6WIND S.A.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <pthread.h>
#include <syslog.h>
#include <getopt.h>
#include <sys/file.h>
#include <stddef.h>
#include <errno.h>
#include <limits.h>
#include <errno.h>
#include <sys/mman.h>
#include <sys/queue.h>

#include <rte_common.h>
#include <rte_debug.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_eal_memconfig.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_log.h>
#include <rte_random.h>
#include <rte_cycles.h>
#include <rte_string_fns.h>
#include <rte_cpuflags.h>
#include <rte_interrupts.h>
#include <rte_pci.h>
#include <rte_dev.h>
#include <rte_devargs.h>
#include <rte_common.h>
#include <rte_version.h>
#include <rte_atomic.h>
#include <malloc_heap.h>

#include "eal_private.h"
#include "eal_thread.h"
#include "eal_internal_cfg.h"
#include "eal_filesystem.h"
#include "eal_hugepages.h"
#include "eal_options.h"

#define MEMSIZE_IF_NO_HUGE_PAGE (64ULL * 1024ULL * 1024ULL)

/* Allow the application to print its usage message too if set */
static rte_usage_hook_t	rte_application_usage_hook = NULL;
/* early configuration structure, when memory config is not mmapped */
static struct rte_mem_config early_mem_config;

/* define fd variable here, because file needs to be kept open for the
 * duration of the program, as we hold a write lock on it in the primary proc */
static int mem_cfg_fd = -1;

static struct flock wr_lock = {
		.l_type = F_WRLCK,
		.l_whence = SEEK_SET,
		.l_start = offsetof(struct rte_mem_config, memseg),
		.l_len = sizeof(early_mem_config.memseg),
};

/* Address of global and public configuration */
static struct rte_config rte_config = {
		.mem_config = &early_mem_config,
};

/* internal configuration (per-core) */
struct lcore_config lcore_config[RTE_MAX_LCORE];

/* internal configuration */
struct internal_config internal_config;

/* used by rte_rdtsc() */
int rte_cycles_vmware_tsc_map;

/* Return a pointer to the configuration structure */
struct rte_config *
rte_eal_get_configuration(void)
{
	return &rte_config;
}

/* parse a sysfs (or other) file containing one integer value */
int
eal_parse_sysfs_value(const char *filename, unsigned long *val)
{
	FILE *f;
	char buf[BUFSIZ];
	char *end = NULL;

	if ((f = fopen(filename, "r")) == NULL) {
		RTE_LOG(ERR, EAL, "%s(): cannot open sysfs value %s\n",
			__func__, filename);
		return -1;
	}

	if (fgets(buf, sizeof(buf), f) == NULL) {
		RTE_LOG(ERR, EAL, "%s(): cannot read sysfs value %s\n",
			__func__, filename);
		fclose(f);
		return -1;
	}
	*val = strtoul(buf, &end, 0);
	if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
		RTE_LOG(ERR, EAL, "%s(): cannot parse sysfs value %s\n",
				__func__, filename);
		fclose(f);
		return -1;
	}
	fclose(f);
	return 0;
}


/* create memory configuration in shared/mmap memory. Take out
 * a write lock on the memsegs, so we can auto-detect primary/secondary.
 * This means we never close the file while running (auto-close on exit).
 * We also don't lock the whole file, so that in future we can use read-locks
 * on other parts, e.g. memzones, to detect if there are running secondary
 * processes. */
static void
rte_eal_config_create(void)
{
	void *rte_mem_cfg_addr;
	int retval;

	const char *pathname = eal_runtime_config_path();

	if (internal_config.no_shconf)
		return;

	if (mem_cfg_fd < 0){
		mem_cfg_fd = open(pathname, O_RDWR | O_CREAT, 0660);
		if (mem_cfg_fd < 0)
			rte_panic("Cannot open '%s' for rte_mem_config\n", pathname);
	}

	retval = ftruncate(mem_cfg_fd, sizeof(*rte_config.mem_config));
	if (retval < 0){
		close(mem_cfg_fd);
		rte_panic("Cannot resize '%s' for rte_mem_config\n", pathname);
	}

	retval = fcntl(mem_cfg_fd, F_SETLK, &wr_lock);
	if (retval < 0){
		close(mem_cfg_fd);
		rte_exit(EXIT_FAILURE, "Cannot create lock on '%s'. Is another primary "
				"process running?\n", pathname);
	}

	rte_mem_cfg_addr = mmap(NULL, sizeof(*rte_config.mem_config),
				PROT_READ | PROT_WRITE, MAP_SHARED, mem_cfg_fd, 0);

	if (rte_mem_cfg_addr == MAP_FAILED){
		rte_panic("Cannot mmap memory for rte_config\n");
	}
	memcpy(rte_mem_cfg_addr, &early_mem_config, sizeof(early_mem_config));
	rte_config.mem_config = (struct rte_mem_config *) rte_mem_cfg_addr;
}

/* attach to an existing shared memory config */
static void
rte_eal_config_attach(void)
{
	void *rte_mem_cfg_addr;
	const char *pathname = eal_runtime_config_path();

	if (internal_config.no_shconf)
		return;

	if (mem_cfg_fd < 0){
		mem_cfg_fd = open(pathname, O_RDWR);
		if (mem_cfg_fd < 0)
			rte_panic("Cannot open '%s' for rte_mem_config\n", pathname);
	}

	rte_mem_cfg_addr = mmap(NULL, sizeof(*rte_config.mem_config),
				PROT_READ | PROT_WRITE, MAP_SHARED, mem_cfg_fd, 0);
	close(mem_cfg_fd);
	if (rte_mem_cfg_addr == MAP_FAILED)
		rte_panic("Cannot mmap memory for rte_config\n");

	rte_config.mem_config = (struct rte_mem_config *) rte_mem_cfg_addr;
}

/* Detect if we are a primary or a secondary process */
enum rte_proc_type_t
eal_proc_type_detect(void)
{
	enum rte_proc_type_t ptype = RTE_PROC_PRIMARY;
	const char *pathname = eal_runtime_config_path();

	/* if we can open the file but not get a write-lock we are a secondary
	 * process. NOTE: if we get a file handle back, we keep that open
	 * and don't close it to prevent a race condition between multiple opens */
	if (((mem_cfg_fd = open(pathname, O_RDWR)) >= 0) &&
			(fcntl(mem_cfg_fd, F_SETLK, &wr_lock) < 0))
		ptype = RTE_PROC_SECONDARY;

	RTE_LOG(INFO, EAL, "Auto-detected process type: %s\n",
			ptype == RTE_PROC_PRIMARY ? "PRIMARY" : "SECONDARY");

	return ptype;
}

/* Sets up rte_config structure with the pointer to shared memory config.*/
static void
rte_config_init(void)
{
	rte_config.process_type = internal_config.process_type;

	switch (rte_config.process_type){
	case RTE_PROC_PRIMARY:
		rte_eal_config_create();
		break;
	case RTE_PROC_SECONDARY:
		rte_eal_config_attach();
		rte_eal_mcfg_wait_complete(rte_config.mem_config);
		break;
	case RTE_PROC_AUTO:
	case RTE_PROC_INVALID:
		rte_panic("Invalid process type\n");
	}
}

/* display usage */
static void
eal_usage(const char *prgname)
{
	printf("\nUsage: %s ", prgname);
	eal_common_usage();
	/* Allow the application to print its usage message too if hook is set */
	if ( rte_application_usage_hook ) {
		printf("===== Application Usage =====\n\n");
		rte_application_usage_hook(prgname);
	}
}

/* Set a per-application usage message */
rte_usage_hook_t
rte_set_application_usage_hook( rte_usage_hook_t usage_func )
{
	rte_usage_hook_t	old_func;

	/* Will be NULL on the first call to denote the last usage routine. */
	old_func					= rte_application_usage_hook;
	rte_application_usage_hook	= usage_func;

	return old_func;
}

static inline size_t
eal_get_hugepage_mem_size(void)
{
	uint64_t size = 0;
	unsigned i, j;

	for (i = 0; i < internal_config.num_hugepage_sizes; i++) {
		struct hugepage_info *hpi = &internal_config.hugepage_info[i];
		if (hpi->hugedir != NULL) {
			for (j = 0; j < RTE_MAX_NUMA_NODES; j++) {
				size += hpi->hugepage_sz * hpi->num_pages[j];
			}
		}
	}

	return (size < SIZE_MAX) ? (size_t)(size) : SIZE_MAX;
}

/* Parse the arguments for --log-level only */
static void
eal_log_level_parse(int argc, char **argv)
{
	int opt;
	char **argvopt;
	int option_index;
	const int old_optind = optind;
	const int old_optopt = optopt;
	const int old_optreset = optreset;
	char * const old_optarg = optarg;

	argvopt = argv;
	optind = 1;
	optreset = 1;

	eal_reset_internal_config(&internal_config);

	while ((opt = getopt_long(argc, argvopt, eal_short_options,
				  eal_long_options, &option_index)) != EOF) {

		int ret;

		/* getopt is not happy, stop right now */
		if (opt == '?')
			break;

		ret = (opt == OPT_LOG_LEVEL_NUM) ?
			eal_parse_common_option(opt, optarg, &internal_config) : 0;

		/* common parser is not happy */
		if (ret < 0)
			break;
	}

	/* restore getopt lib */
	optind = old_optind;
	optopt = old_optopt;
	optreset = old_optreset;
	optarg = old_optarg;
}

/* Parse the argument given in the command line of the application */
static int
eal_parse_args(int argc, char **argv)
{
	int opt, ret;
	char **argvopt;
	int option_index;
	char *prgname = argv[0];
	const int old_optind = optind;
	const int old_optopt = optopt;
	const int old_optreset = optreset;
	char * const old_optarg = optarg;

	argvopt = argv;
	optind = 1;
	optreset = 1;

	while ((opt = getopt_long(argc, argvopt, eal_short_options,
				  eal_long_options, &option_index)) != EOF) {

		/* getopt is not happy, stop right now */
		if (opt == '?') {
			eal_usage(prgname);
			ret = -1;
			goto out;
		}

		ret = eal_parse_common_option(opt, optarg, &internal_config);
		/* common parser is not happy */
		if (ret < 0) {
			eal_usage(prgname);
			ret = -1;
			goto out;
		}
		/* common parser handled this option */
		if (ret == 0)
			continue;

		switch (opt) {
		case 'h':
			eal_usage(prgname);
			exit(EXIT_SUCCESS);
		default:
			if (opt < OPT_LONG_MIN_NUM && isprint(opt)) {
				RTE_LOG(ERR, EAL, "Option %c is not supported "
					"on FreeBSD\n", opt);
			} else if (opt >= OPT_LONG_MIN_NUM &&
				   opt < OPT_LONG_MAX_NUM) {
				RTE_LOG(ERR, EAL, "Option %s is not supported "
					"on FreeBSD\n",
					eal_long_options[option_index].name);
			} else {
				RTE_LOG(ERR, EAL, "Option %d is not supported "
					"on FreeBSD\n", opt);
			}
			eal_usage(prgname);
			ret = -1;
			goto out;
		}
	}

	if (eal_adjust_config(&internal_config) != 0) {
		ret = -1;
		goto out;
	}

	/* sanity checks */
	if (eal_check_common_options(&internal_config) != 0) {
		eal_usage(prgname);
		ret = -1;
		goto out;
	}

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

out:
	/* restore getopt lib */
	optind = old_optind;
	optopt = old_optopt;
	optreset = old_optreset;
	optarg = old_optarg;

	return ret;
}

static void
eal_check_mem_on_local_socket(void)
{
	const struct rte_memseg *ms;
	int i, socket_id;

	socket_id = rte_lcore_to_socket_id(rte_config.master_lcore);

	ms = rte_eal_get_physmem_layout();

	for (i = 0; i < RTE_MAX_MEMSEG; i++)
		if (ms[i].socket_id == socket_id &&
				ms[i].len > 0)
			return;

	RTE_LOG(WARNING, EAL, "WARNING: Master core has no "
			"memory on local socket!\n");
}

static int
sync_func(__attribute__((unused)) void *arg)
{
	return 0;
}

inline static void
rte_eal_mcfg_complete(void)
{
	/* ALL shared mem_config related INIT DONE */
	if (rte_config.process_type == RTE_PROC_PRIMARY)
		rte_config.mem_config->magic = RTE_MAGIC;
}

/* return non-zero if hugepages are enabled. */
int rte_eal_has_hugepages(void)
{
	return !internal_config.no_hugetlbfs;
}

/* Abstraction for port I/0 privilege */
int
rte_eal_iopl_init(void)
{
	static int fd;

	fd = open("/dev/io", O_RDWR);
	if (fd < 0)
		return -1;
	/* keep fd open for iopl */
	return 0;
}

/* Launch threads, called at application init(). */
int
rte_eal_init(int argc, char **argv)
{
	int i, fctret, ret;
	pthread_t thread_id;
	static rte_atomic32_t run_once = RTE_ATOMIC32_INIT(0);
	char cpuset[RTE_CPU_AFFINITY_STR_LEN];
	char thread_name[RTE_MAX_THREAD_NAME_LEN];

	if (!rte_atomic32_test_and_set(&run_once))
		return -1;

	thread_id = pthread_self();

	if (rte_eal_log_early_init() < 0)
		rte_panic("Cannot init early logs\n");

	eal_log_level_parse(argc, argv);

	/* set log level as early as possible */
	rte_set_log_level(internal_config.log_level);

	if (rte_eal_cpu_init() < 0)
		rte_panic("Cannot detect lcores\n");

	fctret = eal_parse_args(argc, argv);
	if (fctret < 0)
		exit(1);

	if (internal_config.no_hugetlbfs == 0 &&
			internal_config.process_type != RTE_PROC_SECONDARY &&
			eal_hugepage_info_init() < 0)
		rte_panic("Cannot get hugepage information\n");

	if (internal_config.memory == 0 && internal_config.force_sockets == 0) {
		if (internal_config.no_hugetlbfs)
			internal_config.memory = MEMSIZE_IF_NO_HUGE_PAGE;
		else
			internal_config.memory = eal_get_hugepage_mem_size();
	}

	if (internal_config.vmware_tsc_map == 1) {
#ifdef RTE_LIBRTE_EAL_VMWARE_TSC_MAP_SUPPORT
		rte_cycles_vmware_tsc_map = 1;
		RTE_LOG (DEBUG, EAL, "Using VMWARE TSC MAP, "
				"you must have monitor_control.pseudo_perfctr = TRUE\n");
#else
		RTE_LOG (WARNING, EAL, "Ignoring --vmware-tsc-map because "
				"RTE_LIBRTE_EAL_VMWARE_TSC_MAP_SUPPORT is not set\n");
#endif
	}

	rte_srand(rte_rdtsc());

	rte_config_init();

	if (rte_eal_memory_init() < 0)
		rte_panic("Cannot init memory\n");

	if (rte_eal_memzone_init() < 0)
		rte_panic("Cannot init memzone\n");

	if (rte_eal_tailqs_init() < 0)
		rte_panic("Cannot init tail queues for objects\n");

/*	if (rte_eal_log_init(argv[0], internal_config.syslog_facility) < 0)
		rte_panic("Cannot init logs\n");*/

	if (rte_eal_alarm_init() < 0)
		rte_panic("Cannot init interrupt-handling thread\n");

	if (rte_eal_intr_init() < 0)
		rte_panic("Cannot init interrupt-handling thread\n");

	if (rte_eal_timer_init() < 0)
		rte_panic("Cannot init HPET or TSC timers\n");

	if (rte_eal_pci_init() < 0)
		rte_panic("Cannot init PCI\n");

	eal_check_mem_on_local_socket();

	if (eal_plugins_init() < 0)
		rte_panic("Cannot init plugins\n");

	eal_thread_init_master(rte_config.master_lcore);

	ret = eal_thread_dump_affinity(cpuset, RTE_CPU_AFFINITY_STR_LEN);

	RTE_LOG(DEBUG, EAL, "Master lcore %u is ready (tid=%p;cpuset=[%s%s])\n",
		rte_config.master_lcore, thread_id, cpuset,
		ret == 0 ? "" : "...");

	if (rte_eal_dev_init() < 0)
		rte_panic("Cannot init pmd devices\n");

	RTE_LCORE_FOREACH_SLAVE(i) {

		/*
		 * create communication pipes between master thread
		 * and children
		 */
		if (pipe(lcore_config[i].pipe_master2slave) < 0)
			rte_panic("Cannot create pipe\n");
		if (pipe(lcore_config[i].pipe_slave2master) < 0)
			rte_panic("Cannot create pipe\n");

		lcore_config[i].state = WAIT;

		/* create a thread for each lcore */
		ret = pthread_create(&lcore_config[i].thread_id, NULL,
				     eal_thread_loop, NULL);
		if (ret != 0)
			rte_panic("Cannot create thread\n");

		/* Set thread_name for aid in debugging. */
		snprintf(thread_name, RTE_MAX_THREAD_NAME_LEN,
				"lcore-slave-%d", i);
		pthread_set_name_np(lcore_config[i].thread_id, thread_name);
	}

	/*
	 * Launch a dummy function on all slave lcores, so that master lcore
	 * knows they are all ready when this function returns.
	 */
	rte_eal_mp_remote_launch(sync_func, NULL, SKIP_MASTER);
	rte_eal_mp_wait_lcore();

	/* Probe & Initialize PCI devices */
	if (rte_eal_pci_probe())
		rte_panic("Cannot probe PCI\n");

	rte_eal_mcfg_complete();

	return fctret;
}

/* get core role */
enum rte_lcore_role_t
rte_eal_lcore_role(unsigned lcore_id)
{
	return rte_config.lcore_role[lcore_id];
}

enum rte_proc_type_t
rte_eal_process_type(void)
{
	return rte_config.process_type;
}