4 * Copyright(c) 2015 Akamai Technologies.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
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.
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.
39 #include <rte_cycles.h>
40 #include <rte_timer.h>
41 #include <rte_common.h>
42 #include <rte_lcore.h>
43 #include <rte_random.h>
44 #include <rte_malloc.h>
46 #undef TEST_TIMER_RACECOND_VERBOSE
48 #ifdef RTE_EXEC_ENV_LINUXAPP
49 #define usec_delay(us) usleep(us)
51 #define usec_delay(us) rte_delay_us(us)
54 #define BILLION (1UL << 30)
56 #define TEST_DURATION_S 20 /* in seconds */
59 static struct rte_timer timer[N_TIMERS];
60 static unsigned timer_lcore_id[N_TIMERS];
62 static unsigned master;
63 static volatile unsigned stop_slaves;
65 static int reload_timer(struct rte_timer *tim);
68 timer_cb(struct rte_timer *tim, void *arg __rte_unused)
70 /* Simulate slow callback function, 100 us. */
73 #ifdef TEST_TIMER_RACECOND_VERBOSE
75 printf("------------------------------------------------\n");
76 printf("timer_cb: core %u timer %lu\n",
77 rte_lcore_id(), tim - timer);
79 (void)reload_timer(tim);
82 RTE_DEFINE_PER_LCORE(unsigned, n_reset_collisions);
85 reload_timer(struct rte_timer *tim)
87 /* Make timer expire roughly when the TSC hits the next BILLION
88 * multiple. Add in timer's index to make them expire in nearly
89 * sorted order. This makes all timers somewhat synchronized,
90 * firing ~2-3 times per second, assuming 2-3 GHz TSCs.
92 uint64_t ticks = BILLION - (rte_get_timer_cycles() % BILLION) +
96 ret = rte_timer_reset(tim, ticks, PERIODICAL, master, timer_cb, NULL);
98 #ifdef TEST_TIMER_RACECOND_VERBOSE
99 printf("- core %u failed to reset timer %lu (OK)\n",
100 rte_lcore_id(), tim - timer);
102 RTE_PER_LCORE(n_reset_collisions) += 1;
108 slave_main_loop(__attribute__((unused)) void *arg)
110 unsigned lcore_id = rte_lcore_id();
113 RTE_PER_LCORE(n_reset_collisions) = 0;
115 printf("Starting main loop on core %u\n", lcore_id);
117 while (!stop_slaves) {
118 /* Wait until the timer manager is running.
119 * We know it's running when we see timer[0] NOT pending.
121 if (rte_timer_pending(&timer[0])) {
126 /* Now, go cause some havoc!
129 for (i = 0; i < N_TIMERS; i++) {
130 if (timer_lcore_id[i] == lcore_id)
131 (void)reload_timer(&timer[i]);
133 usec_delay(100*1000); /* sleep 100 ms */
136 if (RTE_PER_LCORE(n_reset_collisions) != 0) {
137 printf("- core %u, %u reset collisions (OK)\n",
138 lcore_id, RTE_PER_LCORE(n_reset_collisions));
144 test_timer_racecond(void)
154 master = lcore_id = rte_lcore_id();
155 hz = rte_get_timer_hz();
157 /* init and start timers */
158 for (i = 0; i < N_TIMERS; i++) {
159 rte_timer_init(&timer[i]);
160 ret = reload_timer(&timer[i]);
161 TEST_ASSERT(ret == 0, "reload_timer failed");
163 /* Distribute timers to slaves.
164 * Note that we assign timer[0] to the master.
166 timer_lcore_id[i] = lcore_id;
167 lcore_id = rte_get_next_lcore(lcore_id, 1, 1);
170 /* calculate the "end of test" time */
171 cur_time = rte_get_timer_cycles();
172 end_time = cur_time + (hz * TEST_DURATION_S);
174 /* start slave cores */
176 printf("Start timer manage race condition test (%u seconds)\n",
178 rte_eal_mp_remote_launch(slave_main_loop, NULL, SKIP_MASTER);
185 usec_delay(100*1000);
187 cur_time = rte_get_timer_cycles();
188 diff = end_time - cur_time;
191 /* stop slave cores */
192 printf("Stopping timer manage race condition test\n");
194 rte_eal_mp_wait_lcore();
197 for (i = 0; i < N_TIMERS; i++) {
198 ret = rte_timer_stop(&timer[i]);
199 TEST_ASSERT(ret == 0, "rte_timer_stop failed");
205 static struct test_command timer_racecond_cmd = {
206 .command = "timer_racecond_autotest",
207 .callback = test_timer_racecond,
209 REGISTER_TEST_COMMAND(timer_racecond_cmd);