DPDK  16.11.9
timer/main.c
/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 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.
*/
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <sys/queue.h>
#include <rte_common.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_cycles.h>
#include <rte_timer.h>
#include <rte_debug.h>
#define TIMER_RESOLUTION_CYCLES 20000000ULL /* around 10ms at 2 Ghz */
static struct rte_timer timer0;
static struct rte_timer timer1;
/* timer0 callback */
static void
timer0_cb(__attribute__((unused)) struct rte_timer *tim,
__attribute__((unused)) void *arg)
{
static unsigned counter = 0;
unsigned lcore_id = rte_lcore_id();
printf("%s() on lcore %u\n", __func__, lcore_id);
/* this timer is automatically reloaded until we decide to
* stop it, when counter reaches 20. */
if ((counter ++) == 20)
}
/* timer1 callback */
static void
timer1_cb(__attribute__((unused)) struct rte_timer *tim,
__attribute__((unused)) void *arg)
{
unsigned lcore_id = rte_lcore_id();
uint64_t hz;
printf("%s() on lcore %u\n", __func__, lcore_id);
/* reload it on another lcore */
lcore_id = rte_get_next_lcore(lcore_id, 0, 1);
rte_timer_reset(tim, hz/3, SINGLE, lcore_id, timer1_cb, NULL);
}
static __attribute__((noreturn)) int
lcore_mainloop(__attribute__((unused)) void *arg)
{
uint64_t prev_tsc = 0, cur_tsc, diff_tsc;
unsigned lcore_id;
lcore_id = rte_lcore_id();
printf("Starting mainloop on core %u\n", lcore_id);
while (1) {
/*
* Call the timer handler on each core: as we don't
* need a very precise timer, so only call
* rte_timer_manage() every ~10ms (at 2Ghz). In a real
* application, this will enhance performances as
* reading the HPET timer is not efficient.
*/
cur_tsc = rte_rdtsc();
diff_tsc = cur_tsc - prev_tsc;
if (diff_tsc > TIMER_RESOLUTION_CYCLES) {
prev_tsc = cur_tsc;
}
}
}
int
main(int argc, char **argv)
{
int ret;
uint64_t hz;
unsigned lcore_id;
/* init EAL */
ret = rte_eal_init(argc, argv);
if (ret < 0)
rte_panic("Cannot init EAL\n");
/* init RTE timer library */
/* init timer structures */
rte_timer_init(&timer0);
rte_timer_init(&timer1);
/* load timer0, every second, on master lcore, reloaded automatically */
lcore_id = rte_lcore_id();
rte_timer_reset(&timer0, hz, PERIODICAL, lcore_id, timer0_cb, NULL);
/* load timer1, every second/3, on next lcore, reloaded manually */
lcore_id = rte_get_next_lcore(lcore_id, 0, 1);
rte_timer_reset(&timer1, hz/3, SINGLE, lcore_id, timer1_cb, NULL);
/* call lcore_mainloop() on every slave lcore */
rte_eal_remote_launch(lcore_mainloop, NULL, lcore_id);
}
/* call it on master lcore too */
(void) lcore_mainloop(NULL);
return 0;
}