1 /*- 2 * BSD LICENSE 3 * 4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <stdio.h> 35 #include <string.h> 36 #include <stdint.h> 37 #include <errno.h> 38 #include <sys/queue.h> 39 40 #include <rte_common.h> 41 #include <rte_memory.h> 42 #include <rte_launch.h> 43 #include <rte_eal.h> 44 #include <rte_per_lcore.h> 45 #include <rte_lcore.h> 46 #include <rte_cycles.h> 47 #include <rte_timer.h> 48 #include <rte_debug.h> 49 50 #define TIMER_RESOLUTION_CYCLES 20000000ULL /* around 10ms at 2 Ghz */ 51 52 static struct rte_timer timer0; 53 static struct rte_timer timer1; 54 55 /* timer0 callback */ 56 static void 57 timer0_cb(__attribute__((unused)) struct rte_timer *tim, 58 __attribute__((unused)) void *arg) 59 { 60 static unsigned counter = 0; 61 unsigned lcore_id = rte_lcore_id(); 62 63 printf("%s() on lcore %u\n", __func__, lcore_id); 64 65 /* this timer is automatically reloaded until we decide to 66 * stop it, when counter reaches 20. */ 67 if ((counter ++) == 20) 68 rte_timer_stop(tim); 69 } 70 71 /* timer1 callback */ 72 static void 73 timer1_cb(__attribute__((unused)) struct rte_timer *tim, 74 __attribute__((unused)) void *arg) 75 { 76 unsigned lcore_id = rte_lcore_id(); 77 uint64_t hz; 78 79 printf("%s() on lcore %u\n", __func__, lcore_id); 80 81 /* reload it on another lcore */ 82 hz = rte_get_timer_hz(); 83 lcore_id = rte_get_next_lcore(lcore_id, 0, 1); 84 rte_timer_reset(tim, hz/3, SINGLE, lcore_id, timer1_cb, NULL); 85 } 86 87 static __attribute__((noreturn)) int 88 lcore_mainloop(__attribute__((unused)) void *arg) 89 { 90 uint64_t prev_tsc = 0, cur_tsc, diff_tsc; 91 unsigned lcore_id; 92 93 lcore_id = rte_lcore_id(); 94 printf("Starting mainloop on core %u\n", lcore_id); 95 96 while (1) { 97 /* 98 * Call the timer handler on each core: as we don't 99 * need a very precise timer, so only call 100 * rte_timer_manage() every ~10ms (at 2Ghz). In a real 101 * application, this will enhance performances as 102 * reading the HPET timer is not efficient. 103 */ 104 cur_tsc = rte_rdtsc(); 105 diff_tsc = cur_tsc - prev_tsc; 106 if (diff_tsc > TIMER_RESOLUTION_CYCLES) { 107 rte_timer_manage(); 108 prev_tsc = cur_tsc; 109 } 110 } 111 } 112 113 int 114 main(int argc, char **argv) 115 { 116 int ret; 117 uint64_t hz; 118 unsigned lcore_id; 119 120 /* init EAL */ 121 ret = rte_eal_init(argc, argv); 122 if (ret < 0) 123 rte_panic("Cannot init EAL\n"); 124 125 /* init RTE timer library */ 126 rte_timer_subsystem_init(); 127 128 /* init timer structures */ 129 rte_timer_init(&timer0); 130 rte_timer_init(&timer1); 131 132 /* load timer0, every second, on master lcore, reloaded automatically */ 133 hz = rte_get_timer_hz(); 134 lcore_id = rte_lcore_id(); 135 rte_timer_reset(&timer0, hz, PERIODICAL, lcore_id, timer0_cb, NULL); 136 137 /* load timer1, every second/3, on next lcore, reloaded manually */ 138 lcore_id = rte_get_next_lcore(lcore_id, 0, 1); 139 rte_timer_reset(&timer1, hz/3, SINGLE, lcore_id, timer1_cb, NULL); 140 141 /* call lcore_mainloop() on every slave lcore */ 142 RTE_LCORE_FOREACH_SLAVE(lcore_id) { 143 rte_eal_remote_launch(lcore_mainloop, NULL, lcore_id); 144 } 145 146 /* call it on master lcore too */ 147 (void) lcore_mainloop(NULL); 148 149 return 0; 150 } 151