80aa15c4df
Timer sample example assumes that the frequency of the timer is about
2Ghz to control the period of calling rte_timer_manage(). But this
assumption is easy to fail. For example. the frequency of tsc on ARM64
is much less than 2Ghz.
This patch uses the frequency of the current timer to calculate the
correct time interval to ensure consistent result on all platforms.
In addition, the rte_rdtsc() is replaced with the more recommended
rte_get_timer_cycles function in this patch.
Fixes: af75078fece3 ("first public release")
Cc: stable@dpdk.org
Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2010-2014 Intel Corporation
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#include <errno.h>
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#include <sys/queue.h>
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#include <rte_common.h>
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#include <rte_memory.h>
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#include <rte_launch.h>
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#include <rte_eal.h>
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#include <rte_per_lcore.h>
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#include <rte_lcore.h>
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#include <rte_cycles.h>
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#include <rte_timer.h>
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#include <rte_debug.h>
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static uint64_t timer_resolution_cycles;
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static struct rte_timer timer0;
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static struct rte_timer timer1;
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/* timer0 callback */
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static void
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timer0_cb(__rte_unused struct rte_timer *tim,
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__rte_unused void *arg)
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{
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static unsigned counter = 0;
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unsigned lcore_id = rte_lcore_id();
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printf("%s() on lcore %u\n", __func__, lcore_id);
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/* this timer is automatically reloaded until we decide to
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* stop it, when counter reaches 20. */
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if ((counter ++) == 20)
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rte_timer_stop(tim);
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}
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/* timer1 callback */
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static void
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timer1_cb(__rte_unused struct rte_timer *tim,
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__rte_unused void *arg)
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{
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unsigned lcore_id = rte_lcore_id();
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uint64_t hz;
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printf("%s() on lcore %u\n", __func__, lcore_id);
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/* reload it on another lcore */
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hz = rte_get_timer_hz();
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lcore_id = rte_get_next_lcore(lcore_id, 0, 1);
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rte_timer_reset(tim, hz/3, SINGLE, lcore_id, timer1_cb, NULL);
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}
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static __rte_noreturn int
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lcore_mainloop(__rte_unused void *arg)
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{
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uint64_t prev_tsc = 0, cur_tsc, diff_tsc;
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unsigned lcore_id;
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lcore_id = rte_lcore_id();
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printf("Starting mainloop on core %u\n", lcore_id);
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while (1) {
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/*
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* Call the timer handler on each core: as we don't need a
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* very precise timer, so only call rte_timer_manage()
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* every ~10ms. In a real application, this will enhance
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* performances as reading the HPET timer is not efficient.
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*/
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cur_tsc = rte_get_timer_cycles();
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diff_tsc = cur_tsc - prev_tsc;
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if (diff_tsc > timer_resolution_cycles) {
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rte_timer_manage();
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prev_tsc = cur_tsc;
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}
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}
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}
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int
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main(int argc, char **argv)
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{
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int ret;
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uint64_t hz;
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unsigned lcore_id;
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/* init EAL */
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ret = rte_eal_init(argc, argv);
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if (ret < 0)
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rte_panic("Cannot init EAL\n");
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/* init RTE timer library */
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rte_timer_subsystem_init();
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/* init timer structures */
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rte_timer_init(&timer0);
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rte_timer_init(&timer1);
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hz = rte_get_timer_hz();
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timer_resolution_cycles = hz * 10 / 1000; /* around 10ms */
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/* load timer0, every second, on main lcore, reloaded automatically */
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lcore_id = rte_lcore_id();
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rte_timer_reset(&timer0, hz, PERIODICAL, lcore_id, timer0_cb, NULL);
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/* load timer1, every second/3, on next lcore, reloaded manually */
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lcore_id = rte_get_next_lcore(lcore_id, 0, 1);
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rte_timer_reset(&timer1, hz/3, SINGLE, lcore_id, timer1_cb, NULL);
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/* call lcore_mainloop() on every worker lcore */
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RTE_LCORE_FOREACH_WORKER(lcore_id) {
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rte_eal_remote_launch(lcore_mainloop, NULL, lcore_id);
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}
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/* call it on main lcore too */
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(void) lcore_mainloop(NULL);
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/* clean up the EAL */
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rte_eal_cleanup();
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return 0;
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}
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