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/*-
 *   BSD LICENSE
 *
 *   Copyright 2015 Intel Shannon Ltd. 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 <inttypes.h>

#include <rte_common.h>
#include <rte_cycles.h>
#include <rte_lcore.h>
#include <rte_log.h>
#include <rte_keepalive.h>
#include <rte_malloc.h>

static void
print_trace(const char *msg, struct rte_keepalive *keepcfg, int idx_core)
{
	RTE_LOG(INFO, EAL, "%sLast seen %" PRId64 "ms ago.\n",
		msg,
		((rte_rdtsc() - keepcfg->last_alive[idx_core])*1000)
		/ rte_get_tsc_hz()
	      );
}


void
rte_keepalive_dispatch_pings(__rte_unused void *ptr_timer,
	void *ptr_data)
{
	struct rte_keepalive *keepcfg = ptr_data;
	int idx_core;

	for (idx_core = 0; idx_core < RTE_KEEPALIVE_MAXCORES; idx_core++) {
		if (keepcfg->active_cores[idx_core] == 0)
			continue;

		switch (keepcfg->state_flags[idx_core]) {
		case ALIVE: /* Alive */
			keepcfg->state_flags[idx_core] = MISSING;
			keepcfg->last_alive[idx_core] = rte_rdtsc();
			break;
		case MISSING: /* MIA */
			print_trace("Core MIA. ", keepcfg, idx_core);
			keepcfg->state_flags[idx_core] = DEAD;
			break;
		case DEAD: /* Dead */
			keepcfg->state_flags[idx_core] = GONE;
			print_trace("Core died. ", keepcfg, idx_core);
			if (keepcfg->callback)
				keepcfg->callback(
					keepcfg->callback_data,
					idx_core
					);
			break;
		case GONE: /* Buried */
			break;
		}
	}
}


struct rte_keepalive *
rte_keepalive_create(rte_keepalive_failure_callback_t callback,
	void *data)
{
	struct rte_keepalive *keepcfg;

	keepcfg = rte_zmalloc("RTE_EAL_KEEPALIVE",
		sizeof(struct rte_keepalive),
		RTE_CACHE_LINE_SIZE);
	if (keepcfg != NULL) {
		keepcfg->callback = callback;
		keepcfg->callback_data = data;
		keepcfg->tsc_initial = rte_rdtsc();
		keepcfg->tsc_mhz = rte_get_tsc_hz() / 1000;
	}
	return keepcfg;
}


void
rte_keepalive_register_core(struct rte_keepalive *keepcfg, const int id_core)
{
	if (id_core < RTE_KEEPALIVE_MAXCORES)
		keepcfg->active_cores[id_core] = 1;
}