1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2010-2014 Intel Corporation 3 */ 4 5 #include <stdio.h> 6 #include <string.h> 7 #include <stdint.h> 8 #include <errno.h> 9 #include <sys/queue.h> 10 11 #include <rte_common.h> 12 #include <rte_memory.h> 13 #include <rte_launch.h> 14 #include <rte_eal.h> 15 #include <rte_per_lcore.h> 16 #include <rte_lcore.h> 17 #include <rte_cycles.h> 18 #include <rte_timer.h> 19 #include <rte_debug.h> 20 21 #define TIMER_RESOLUTION_CYCLES 20000000ULL /* around 10ms at 2 Ghz */ 22 23 static struct rte_timer timer0; 24 static struct rte_timer timer1; 25 26 /* timer0 callback */ 27 static void 28 timer0_cb(__attribute__((unused)) struct rte_timer *tim, 29 __attribute__((unused)) void *arg) 30 { 31 static unsigned counter = 0; 32 unsigned lcore_id = rte_lcore_id(); 33 34 printf("%s() on lcore %u\n", __func__, lcore_id); 35 36 /* this timer is automatically reloaded until we decide to 37 * stop it, when counter reaches 20. */ 38 if ((counter ++) == 20) 39 rte_timer_stop(tim); 40 } 41 42 /* timer1 callback */ 43 static void 44 timer1_cb(__attribute__((unused)) struct rte_timer *tim, 45 __attribute__((unused)) void *arg) 46 { 47 unsigned lcore_id = rte_lcore_id(); 48 uint64_t hz; 49 50 printf("%s() on lcore %u\n", __func__, lcore_id); 51 52 /* reload it on another lcore */ 53 hz = rte_get_timer_hz(); 54 lcore_id = rte_get_next_lcore(lcore_id, 0, 1); 55 rte_timer_reset(tim, hz/3, SINGLE, lcore_id, timer1_cb, NULL); 56 } 57 58 static __attribute__((noreturn)) int 59 lcore_mainloop(__attribute__((unused)) void *arg) 60 { 61 uint64_t prev_tsc = 0, cur_tsc, diff_tsc; 62 unsigned lcore_id; 63 64 lcore_id = rte_lcore_id(); 65 printf("Starting mainloop on core %u\n", lcore_id); 66 67 while (1) { 68 /* 69 * Call the timer handler on each core: as we don't 70 * need a very precise timer, so only call 71 * rte_timer_manage() every ~10ms (at 2Ghz). In a real 72 * application, this will enhance performances as 73 * reading the HPET timer is not efficient. 74 */ 75 cur_tsc = rte_rdtsc(); 76 diff_tsc = cur_tsc - prev_tsc; 77 if (diff_tsc > TIMER_RESOLUTION_CYCLES) { 78 rte_timer_manage(); 79 prev_tsc = cur_tsc; 80 } 81 } 82 } 83 84 int 85 main(int argc, char **argv) 86 { 87 int ret; 88 uint64_t hz; 89 unsigned lcore_id; 90 91 /* init EAL */ 92 ret = rte_eal_init(argc, argv); 93 if (ret < 0) 94 rte_panic("Cannot init EAL\n"); 95 96 /* init RTE timer library */ 97 rte_timer_subsystem_init(); 98 99 /* init timer structures */ 100 rte_timer_init(&timer0); 101 rte_timer_init(&timer1); 102 103 /* load timer0, every second, on master lcore, reloaded automatically */ 104 hz = rte_get_timer_hz(); 105 lcore_id = rte_lcore_id(); 106 rte_timer_reset(&timer0, hz, PERIODICAL, lcore_id, timer0_cb, NULL); 107 108 /* load timer1, every second/3, on next lcore, reloaded manually */ 109 lcore_id = rte_get_next_lcore(lcore_id, 0, 1); 110 rte_timer_reset(&timer1, hz/3, SINGLE, lcore_id, timer1_cb, NULL); 111 112 /* call lcore_mainloop() on every slave lcore */ 113 RTE_LCORE_FOREACH_SLAVE(lcore_id) { 114 rte_eal_remote_launch(lcore_mainloop, NULL, lcore_id); 115 } 116 117 /* call it on master lcore too */ 118 (void) lcore_mainloop(NULL); 119 120 return 0; 121 } 122