1 /*- 2 * BSD LICENSE 3 * 4 * Copyright(c) 2010-2012 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 * version: DPDK.L.1.2.3-3 34 */ 35 36 #include <stdio.h> 37 #include <string.h> 38 #include <stdint.h> 39 #include <errno.h> 40 #include <sys/queue.h> 41 42 #include <rte_common.h> 43 #include <rte_memory.h> 44 #include <rte_memzone.h> 45 #include <rte_launch.h> 46 #include <rte_tailq.h> 47 #include <rte_eal.h> 48 #include <rte_per_lcore.h> 49 #include <rte_lcore.h> 50 #include <rte_cycles.h> 51 #include <rte_timer.h> 52 #include <rte_debug.h> 53 54 #include "main.h" 55 56 #define TIMER_RESOLUTION_CYCLES 20000000ULL /* around 10ms at 2 Ghz */ 57 58 static struct rte_timer timer0; 59 static struct rte_timer timer1; 60 61 /* timer0 callback */ 62 static void 63 timer0_cb(__attribute__((unused)) struct rte_timer *tim, 64 __attribute__((unused)) void *arg) 65 { 66 static unsigned counter = 0; 67 unsigned lcore_id = rte_lcore_id(); 68 69 printf("%s() on lcore %u\n", __func__, lcore_id); 70 71 /* this timer is automatically reloaded until we decide to 72 * stop it, when counter reaches 20. */ 73 if ((counter ++) == 20) 74 rte_timer_stop(tim); 75 } 76 77 /* timer1 callback */ 78 static void 79 timer1_cb(__attribute__((unused)) struct rte_timer *tim, 80 __attribute__((unused)) void *arg) 81 { 82 unsigned lcore_id = rte_lcore_id(); 83 uint64_t hz; 84 85 printf("%s() on lcore %u\n", __func__, lcore_id); 86 87 /* reload it on another lcore */ 88 hz = rte_get_hpet_hz(); 89 lcore_id = rte_get_next_lcore(lcore_id, 0, 1); 90 rte_timer_reset(tim, hz/3, SINGLE, lcore_id, timer1_cb, NULL); 91 } 92 93 static __attribute__((noreturn)) int 94 lcore_mainloop(__attribute__((unused)) void *arg) 95 { 96 uint64_t prev_tsc = 0, cur_tsc, diff_tsc; 97 unsigned lcore_id; 98 99 lcore_id = rte_lcore_id(); 100 printf("Starting mainloop on core %u\n", lcore_id); 101 102 while (1) { 103 /* 104 * Call the timer handler on each core: as we don't 105 * need a very precise timer, so only call 106 * rte_timer_manage() every ~10ms (at 2Ghz). In a real 107 * application, this will enhance performances as 108 * reading the HPET timer is not efficient. 109 */ 110 cur_tsc = rte_rdtsc(); 111 diff_tsc = cur_tsc - prev_tsc; 112 if (diff_tsc > TIMER_RESOLUTION_CYCLES) { 113 rte_timer_manage(); 114 prev_tsc = cur_tsc; 115 } 116 } 117 } 118 119 int 120 MAIN(int argc, char **argv) 121 { 122 int ret; 123 uint64_t hz; 124 unsigned lcore_id; 125 126 /* init EAL */ 127 ret = rte_eal_init(argc, argv); 128 if (ret < 0) 129 rte_panic("Cannot init EAL\n"); 130 131 /* init RTE timer library */ 132 rte_timer_subsystem_init(); 133 134 /* init timer structures */ 135 rte_timer_init(&timer0); 136 rte_timer_init(&timer1); 137 138 /* load timer0, every second, on master lcore, reloaded automatically */ 139 hz = rte_get_hpet_hz(); 140 lcore_id = rte_lcore_id(); 141 rte_timer_reset(&timer0, hz, PERIODICAL, lcore_id, timer0_cb, NULL); 142 143 /* load timer1, every second/3, on next lcore, reloaded manually */ 144 lcore_id = rte_get_next_lcore(lcore_id, 0, 1); 145 rte_timer_reset(&timer1, hz/3, SINGLE, lcore_id, timer1_cb, NULL); 146 147 /* call lcore_mainloop() on every slave lcore */ 148 RTE_LCORE_FOREACH_SLAVE(lcore_id) { 149 rte_eal_remote_launch(lcore_mainloop, NULL, lcore_id); 150 } 151 152 /* call it on master lcore too */ 153 (void) lcore_mainloop(NULL); 154 155 return 0; 156 } 157