1 /*- 2 * BSD LICENSE 3 * 4 * Copyright(c) 2010-2013 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_memzone.h> 43 #include <rte_launch.h> 44 #include <rte_tailq.h> 45 #include <rte_eal.h> 46 #include <rte_per_lcore.h> 47 #include <rte_lcore.h> 48 #include <rte_cycles.h> 49 #include <rte_timer.h> 50 #include <rte_debug.h> 51 52 #include "main.h" 53 54 #define TIMER_RESOLUTION_CYCLES 20000000ULL /* around 10ms at 2 Ghz */ 55 56 static struct rte_timer timer0; 57 static struct rte_timer timer1; 58 59 /* timer0 callback */ 60 static void 61 timer0_cb(__attribute__((unused)) struct rte_timer *tim, 62 __attribute__((unused)) void *arg) 63 { 64 static unsigned counter = 0; 65 unsigned lcore_id = rte_lcore_id(); 66 67 printf("%s() on lcore %u\n", __func__, lcore_id); 68 69 /* this timer is automatically reloaded until we decide to 70 * stop it, when counter reaches 20. */ 71 if ((counter ++) == 20) 72 rte_timer_stop(tim); 73 } 74 75 /* timer1 callback */ 76 static void 77 timer1_cb(__attribute__((unused)) struct rte_timer *tim, 78 __attribute__((unused)) void *arg) 79 { 80 unsigned lcore_id = rte_lcore_id(); 81 uint64_t hz; 82 83 printf("%s() on lcore %u\n", __func__, lcore_id); 84 85 /* reload it on another lcore */ 86 hz = rte_get_timer_hz(); 87 lcore_id = rte_get_next_lcore(lcore_id, 0, 1); 88 rte_timer_reset(tim, hz/3, SINGLE, lcore_id, timer1_cb, NULL); 89 } 90 91 static __attribute__((noreturn)) int 92 lcore_mainloop(__attribute__((unused)) void *arg) 93 { 94 uint64_t prev_tsc = 0, cur_tsc, diff_tsc; 95 unsigned lcore_id; 96 97 lcore_id = rte_lcore_id(); 98 printf("Starting mainloop on core %u\n", lcore_id); 99 100 while (1) { 101 /* 102 * Call the timer handler on each core: as we don't 103 * need a very precise timer, so only call 104 * rte_timer_manage() every ~10ms (at 2Ghz). In a real 105 * application, this will enhance performances as 106 * reading the HPET timer is not efficient. 107 */ 108 cur_tsc = rte_rdtsc(); 109 diff_tsc = cur_tsc - prev_tsc; 110 if (diff_tsc > TIMER_RESOLUTION_CYCLES) { 111 rte_timer_manage(); 112 prev_tsc = cur_tsc; 113 } 114 } 115 } 116 117 int 118 MAIN(int argc, char **argv) 119 { 120 int ret; 121 uint64_t hz; 122 unsigned lcore_id; 123 124 /* init EAL */ 125 ret = rte_eal_init(argc, argv); 126 if (ret < 0) 127 rte_panic("Cannot init EAL\n"); 128 129 /* init RTE timer library */ 130 rte_timer_subsystem_init(); 131 132 /* init timer structures */ 133 rte_timer_init(&timer0); 134 rte_timer_init(&timer1); 135 136 /* load timer0, every second, on master lcore, reloaded automatically */ 137 hz = rte_get_timer_hz(); 138 lcore_id = rte_lcore_id(); 139 rte_timer_reset(&timer0, hz, PERIODICAL, lcore_id, timer0_cb, NULL); 140 141 /* load timer1, every second/3, on next lcore, reloaded manually */ 142 lcore_id = rte_get_next_lcore(lcore_id, 0, 1); 143 rte_timer_reset(&timer1, hz/3, SINGLE, lcore_id, timer1_cb, NULL); 144 145 /* call lcore_mainloop() on every slave lcore */ 146 RTE_LCORE_FOREACH_SLAVE(lcore_id) { 147 rte_eal_remote_launch(lcore_mainloop, NULL, lcore_id); 148 } 149 150 /* call it on master lcore too */ 151 (void) lcore_mainloop(NULL); 152 153 return 0; 154 } 155