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v26.07
examples/timer/main.c
133 строки
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Conor Fogarty
doc: use code snippets in sample app guides
31 июл 2021, 16:42
31 июл 2021, 16:42
9a212dc
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/* 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. 8< */ static void timer0_cb(__rte_unused struct rte_timer *tim, __rte_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) rte_timer_stop(tim); } /* >8 End of timer0 callback. */ /* timer1 callback. 8< */ 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 */ hz = rte_get_timer_hz(); lcore_id = rte_get_next_lcore(lcore_id, 0, 1); rte_timer_reset(tim, hz/3, SINGLE, lcore_id, timer1_cb, NULL); } /* >8 End of timer1 callback. */ 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); /* Main loop. 8< */ 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) { rte_timer_manage(); prev_tsc = cur_tsc; } } /* >8 End of main loop. */ } int main(int argc, char **argv) { int ret; uint64_t hz; unsigned lcore_id; /* Init EAL. 8< */ ret = rte_eal_init(argc, argv); if (ret < 0) rte_panic("Cannot init EAL\n"); /* init RTE timer library */ rte_timer_subsystem_init(); /* >8 End of init EAL. */ /* Init timer structures. 8< */ rte_timer_init(&timer0); rte_timer_init(&timer1); /* >8 End of init timer structures. */ /* Load timer0, every second, on main lcore, reloaded automatically. 8< */ hz = rte_get_timer_hz(); timer_resolution_cycles = hz * 10 / 1000; /* around 10ms */ 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); /* >8 End of two timers configured. */ /* Call lcore_mainloop() on every worker lcore. 8< */ RTE_LCORE_FOREACH_WORKER(lcore_id) { rte_eal_remote_launch(lcore_mainloop, NULL, lcore_id); } /* call it on main lcore too */ (void) lcore_mainloop(NULL); /* >8 End of call lcore_mainloop() on every worker lcore. */ /* clean up the EAL */ rte_eal_cleanup(); return 0; }