/*-
 *   BSD LICENSE
 * 
 *   Copyright(c) 2010-2013 Intel Corporation. All rights reserved.
 *   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.
 */

#ifndef _RTE_LCORE_H_
#define _RTE_LCORE_H_

/**
 * @file
 *
 * API for lcore and Socket Manipulation. Parts of this are execution
 * environment specific.
 *
 */
#include <rte_per_lcore.h>
#include <rte_eal.h>
#include <rte_launch.h>

#ifdef __cplusplus
extern "C" {
#endif

#define LCORE_ID_ANY -1    /**< Any lcore. */

RTE_DECLARE_PER_LCORE(unsigned, _lcore_id); /**< Per core "core id". */

/**
 * Return the ID of the execution unit we are running on.
 * @return
 *  Logical core ID
 */
static inline unsigned
rte_lcore_id(void)
{
	return RTE_PER_LCORE(_lcore_id);
}

/**
 * Get the id of the master lcore
 *
 * @return
 *   the id of the master lcore
 */
static inline unsigned
rte_get_master_lcore(void)
{
	return rte_eal_get_configuration()->master_lcore;
}

/**
 * Return the number of execution units (lcores) on the system.
 *
 * @return
 *   the number of execution units (lcores) on the system.
 */
static inline unsigned
rte_lcore_count(void)
{
	const struct rte_config *cfg = rte_eal_get_configuration();
	return cfg->lcore_count;
}

#include <exec-env/rte_lcore.h>

/**
 * Return the ID of the physical socket of the logical core we are
 * running on.
 * @return
 *   the ID of current lcoreid's physical socket
 */
static inline unsigned
rte_socket_id(void)
{
	return lcore_config[rte_lcore_id()].socket_id;
}

/**
 * Get the ID of the physical socket of the specified lcore
 *
 * @param lcore_id
 *   the targeted lcore, which MUST be between 0 and RTE_MAX_LCORE-1.
 * @return
 *   the ID of lcoreid's physical socket
 */
static inline unsigned
rte_lcore_to_socket_id(unsigned lcore_id)
{
	return lcore_config[lcore_id].socket_id;
}

/**
 * Test if an lcore is enabled.
 *
 * @param lcore_id
 *   The identifier of the lcore, which MUST be between 0 and
 *   RTE_MAX_LCORE-1.
 * @return
 *   True if the given lcore is enabled; false otherwise.
 */
static inline int
rte_lcore_is_enabled(unsigned lcore_id)
{
	struct rte_config *cfg = rte_eal_get_configuration();
	if (lcore_id >= RTE_MAX_LCORE)
		return 0;
	return (cfg->lcore_role[lcore_id] != ROLE_OFF);
}

/**
 * Get the next enabled lcore ID.
 *
 * @param i
 *   The current lcore (reference).
 * @param skip_master
 *   If true, do not return the ID of the master lcore.
 * @param wrap
 *   If true, go back to 0 when RTE_MAX_LCORE is reached; otherwise,
 *   return RTE_MAX_LCORE.
 * @return
 *   The next lcore_id or RTE_MAX_LCORE if not found.
 */
static inline unsigned
rte_get_next_lcore(unsigned i, int skip_master, int wrap)
{
	i++;
	if (wrap)
		i %= RTE_MAX_LCORE;

	while (i < RTE_MAX_LCORE) {
		if (!rte_lcore_is_enabled(i) ||
		    (skip_master && (i == rte_get_master_lcore()))) {
			i++;
			if (wrap)
				i %= RTE_MAX_LCORE;
			continue;
		}
		break;
	}
	return i;
}
/**
 * Macro to browse all running lcores.
 */
#define RTE_LCORE_FOREACH(i)						\
	for (i = rte_get_next_lcore(-1, 0, 0);				\
	     i<RTE_MAX_LCORE;						\
	     i = rte_get_next_lcore(i, 0, 0))

/**
 * Macro to browse all running lcores except the master lcore.
 */
#define RTE_LCORE_FOREACH_SLAVE(i)					\
	for (i = rte_get_next_lcore(-1, 1, 0);				\
	     i<RTE_MAX_LCORE;						\
	     i = rte_get_next_lcore(i, 1, 0))

#ifdef __cplusplus
}
#endif


#endif /* _RTE_LCORE_H_ */