ddcd7640ca
The new macro __rte_noreturn, for compiler hinting, is now used where appropriate for consistency. Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
122 lines
2.8 KiB
C
122 lines
2.8 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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#define TIMER_RESOLUTION_CYCLES 20000000ULL /* around 10ms at 2 Ghz */
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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
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* need a very precise timer, so only call
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* rte_timer_manage() every ~10ms (at 2Ghz). In a real
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* application, this will enhance performances as
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* reading the HPET timer is not efficient.
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*/
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cur_tsc = rte_rdtsc();
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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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/* load timer0, every second, on master lcore, reloaded automatically */
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hz = rte_get_timer_hz();
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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 slave lcore */
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RTE_LCORE_FOREACH_SLAVE(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 master lcore too */
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(void) lcore_mainloop(NULL);
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return 0;
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}
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