1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2015 Akamai Technologies.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * * Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
14 * distribution.
15 * * Neither the name of Intel Corporation nor the names of its
16 * contributors may be used to endorse or promote products derived
17 * from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include "test.h"
33
34 #include <stdio.h>
35 #include <unistd.h>
36 #include <inttypes.h>
37 #include <rte_cycles.h>
38 #include <rte_timer.h>
39 #include <rte_common.h>
40 #include <rte_lcore.h>
41 #include <rte_random.h>
42 #include <rte_malloc.h>
43 #include <rte_pause.h>
44
45 #ifdef RTE_EXEC_ENV_LINUX
46 #define usec_delay(us) usleep(us)
47 #else
48 #define usec_delay(us) rte_delay_us(us)
49 #endif
50
51 #define BILLION (1UL << 30)
52
53 #define TEST_DURATION_S 4 /* in seconds */
54 #define N_TIMERS 50
55
56 static struct rte_timer timer[N_TIMERS];
57 static unsigned int timer_lcore_id[N_TIMERS];
58
59 static unsigned int main_lcore;
60 static volatile unsigned int stop_workers;
61
62 static int reload_timer(struct rte_timer *tim);
63
64 RTE_LOG_REGISTER(timer_logtype_test, test.timer, INFO);
65
66 static void
timer_cb(struct rte_timer * tim,void * arg __rte_unused)67 timer_cb(struct rte_timer *tim, void *arg __rte_unused)
68 {
69 /* Simulate slow callback function, 100 us. */
70 rte_delay_us(100);
71 if (tim == &timer[0])
72 rte_log(RTE_LOG_DEBUG, timer_logtype_test,
73 "------------------------------------------------\n");
74 rte_log(RTE_LOG_DEBUG, timer_logtype_test, "%s: core %u timer %"
75 PRIuPTR "\n", __func__, rte_lcore_id(), tim - timer);
76 (void)reload_timer(tim);
77 }
78
79 RTE_DEFINE_PER_LCORE(unsigned, n_reset_collisions);
80
81 static int
reload_timer(struct rte_timer * tim)82 reload_timer(struct rte_timer *tim)
83 {
84 /* Make timer expire roughly when the TSC hits the next BILLION
85 * multiple. Add in timer's index to make them expire in nearly
86 * sorted order. This makes all timers somewhat synchronized,
87 * firing ~2-3 times per second, assuming 2-3 GHz TSCs.
88 */
89 uint64_t ticks = BILLION - (rte_get_timer_cycles() % BILLION) +
90 (tim - timer);
91 int ret;
92
93 ret = rte_timer_reset(tim, ticks, PERIODICAL, main_lcore, timer_cb, NULL);
94 if (ret != 0) {
95 rte_log(RTE_LOG_DEBUG, timer_logtype_test,
96 "- core %u failed to reset timer %" PRIuPTR " (OK)\n",
97 rte_lcore_id(), tim - timer);
98 RTE_PER_LCORE(n_reset_collisions) += 1;
99 }
100 return ret;
101 }
102
103 static int
worker_main_loop(__rte_unused void * arg)104 worker_main_loop(__rte_unused void *arg)
105 {
106 unsigned lcore_id = rte_lcore_id();
107 unsigned i;
108
109 RTE_PER_LCORE(n_reset_collisions) = 0;
110
111 printf("Starting main loop on core %u\n", lcore_id);
112
113 while (!stop_workers) {
114 /* Wait until the timer manager is running.
115 * We know it's running when we see timer[0] NOT pending.
116 */
117 if (rte_timer_pending(&timer[0])) {
118 rte_pause();
119 continue;
120 }
121
122 /* Now, go cause some havoc!
123 * Reload our timers.
124 */
125 for (i = 0; i < N_TIMERS; i++) {
126 if (timer_lcore_id[i] == lcore_id)
127 (void)reload_timer(&timer[i]);
128 }
129 usec_delay(100*1000); /* sleep 100 ms */
130 }
131
132 if (RTE_PER_LCORE(n_reset_collisions) != 0) {
133 printf("- core %u, %u reset collisions (OK)\n",
134 lcore_id, RTE_PER_LCORE(n_reset_collisions));
135 }
136 return 0;
137 }
138
139 static int
test_timer_racecond(void)140 test_timer_racecond(void)
141 {
142 int ret;
143 uint64_t hz;
144 uint64_t cur_time;
145 uint64_t end_time;
146 int64_t diff = 0;
147 unsigned lcore_id;
148 unsigned i;
149
150 main_lcore = lcore_id = rte_lcore_id();
151 hz = rte_get_timer_hz();
152
153 /* init and start timers */
154 for (i = 0; i < N_TIMERS; i++) {
155 rte_timer_init(&timer[i]);
156 ret = reload_timer(&timer[i]);
157 TEST_ASSERT(ret == 0, "reload_timer failed");
158
159 /* Distribute timers to workers.
160 * Note that we assign timer[0] to the main.
161 */
162 timer_lcore_id[i] = lcore_id;
163 lcore_id = rte_get_next_lcore(lcore_id, 1, 1);
164 }
165
166 /* calculate the "end of test" time */
167 cur_time = rte_get_timer_cycles();
168 end_time = cur_time + (hz * TEST_DURATION_S);
169
170 /* start worker cores */
171 stop_workers = 0;
172 printf("Start timer manage race condition test (%u seconds)\n",
173 TEST_DURATION_S);
174 rte_eal_mp_remote_launch(worker_main_loop, NULL, SKIP_MAIN);
175
176 while (diff >= 0) {
177 /* run the timers */
178 rte_timer_manage();
179
180 /* wait 100 ms */
181 usec_delay(100*1000);
182
183 cur_time = rte_get_timer_cycles();
184 diff = end_time - cur_time;
185 }
186
187 /* stop worker cores */
188 printf("Stopping timer manage race condition test\n");
189 stop_workers = 1;
190 rte_eal_mp_wait_lcore();
191
192 /* stop timers */
193 for (i = 0; i < N_TIMERS; i++) {
194 ret = rte_timer_stop(&timer[i]);
195 TEST_ASSERT(ret == 0, "rte_timer_stop failed");
196 }
197
198 return TEST_SUCCESS;
199 }
200
201 REGISTER_TEST_COMMAND(timer_racecond_autotest, test_timer_racecond);
202