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