DPDK  20.11.3
examples/timer/main.c
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#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_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>
static uint64_t timer_resolution_cycles;
static struct rte_timer timer0;
static struct rte_timer timer1;
/* timer0 callback */
static void
timer0_cb(__rte_unused struct rte_timer *tim,
{
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(__rte_unused struct rte_timer *tim,
__rte_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 __rte_noreturn int
lcore_mainloop(__rte_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. In a real application, this will enhance
* performances as reading the HPET timer is not efficient.
*/
cur_tsc = rte_get_timer_cycles();
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);
timer_resolution_cycles = hz * 10 / 1000; /* around 10ms */
/* load timer0, every second, on main 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 worker lcore */
rte_eal_remote_launch(lcore_mainloop, NULL, lcore_id);
}
/* call it on main lcore too */
(void) lcore_mainloop(NULL);
/* clean up the EAL */
return 0;
}