summaryrefslogtreecommitdiffstats
path: root/app/test/test_timer_racecond.c
blob: 7824ec4bf6191f9b76300102e5f20d44d51811ba (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2015 Akamai Technologies.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "test.h"

#include <stdio.h>
#include <unistd.h>
#include <inttypes.h>
#include <rte_cycles.h>
#include <rte_timer.h>
#include <rte_common.h>
#include <rte_lcore.h>
#include <rte_random.h>
#include <rte_malloc.h>

#undef TEST_TIMER_RACECOND_VERBOSE

#ifdef RTE_EXEC_ENV_LINUXAPP
#define usec_delay(us) usleep(us)
#else
#define usec_delay(us) rte_delay_us(us)
#endif

#define BILLION (1UL << 30)

#define TEST_DURATION_S 20 /* in seconds */
#define N_TIMERS    50

static struct rte_timer timer[N_TIMERS];
static unsigned timer_lcore_id[N_TIMERS];

static unsigned master;
static volatile unsigned stop_slaves;

static int reload_timer(struct rte_timer *tim);

static void
timer_cb(struct rte_timer *tim, void *arg __rte_unused)
{
	/* Simulate slow callback function, 100 us. */
	rte_delay_us(100);

#ifdef TEST_TIMER_RACECOND_VERBOSE
	if (tim == &timer[0])
		printf("------------------------------------------------\n");
	printf("timer_cb: core %u timer %lu\n",
		rte_lcore_id(), tim - timer);
#endif
	(void)reload_timer(tim);
}

RTE_DEFINE_PER_LCORE(unsigned, n_reset_collisions);

static int
reload_timer(struct rte_timer *tim)
{
	/* Make timer expire roughly when the TSC hits the next BILLION
	 * multiple. Add in timer's index to make them expire in nearly
	 * sorted order. This makes all timers somewhat synchronized,
	 * firing ~2-3 times per second, assuming 2-3 GHz TSCs.
	 */
	uint64_t ticks = BILLION - (rte_get_timer_cycles() % BILLION) +
	    (tim - timer);
	int ret;

	ret = rte_timer_reset(tim, ticks, PERIODICAL, master, timer_cb, NULL);
	if (ret != 0) {
#ifdef TEST_TIMER_RACECOND_VERBOSE
		printf("- core %u failed to reset timer %lu (OK)\n",
			rte_lcore_id(), tim - timer);
#endif
		RTE_PER_LCORE(n_reset_collisions) += 1;
	}
	return ret;
}

static int
slave_main_loop(__attribute__((unused)) void *arg)
{
	unsigned lcore_id = rte_lcore_id();
	unsigned i;

	RTE_PER_LCORE(n_reset_collisions) = 0;

	printf("Starting main loop on core %u\n", lcore_id);

	while (!stop_slaves) {
		/* Wait until the timer manager is running.
		 * We know it's running when we see timer[0] NOT pending.
		 */
		if (rte_timer_pending(&timer[0])) {
			rte_pause();
			continue;
		}

		/* Now, go cause some havoc!
		 * Reload our timers.
		 */
		for (i = 0; i < N_TIMERS; i++) {
			if (timer_lcore_id[i] == lcore_id)
				(void)reload_timer(&timer[i]);
		}
		usec_delay(100*1000); /* sleep 100 ms */
	}

	if (RTE_PER_LCORE(n_reset_collisions) != 0) {
		printf("- core %u, %u reset collisions (OK)\n",
			lcore_id, RTE_PER_LCORE(n_reset_collisions));
	}
	return 0;
}

static int
test_timer_racecond(void)
{
	int ret;
	uint64_t hz;
	uint64_t cur_time;
	uint64_t end_time;
	int64_t diff = 0;
	unsigned lcore_id;
	unsigned i;

	master = lcore_id = rte_lcore_id();
	hz = rte_get_timer_hz();

	/* init and start timers */
	for (i = 0; i < N_TIMERS; i++) {
		rte_timer_init(&timer[i]);
		ret = reload_timer(&timer[i]);
		TEST_ASSERT(ret == 0, "reload_timer failed");

		/* Distribute timers to slaves.
		 * Note that we assign timer[0] to the master.
		 */
		timer_lcore_id[i] = lcore_id;
		lcore_id = rte_get_next_lcore(lcore_id, 1, 1);
	}

	/* calculate the "end of test" time */
	cur_time = rte_get_timer_cycles();
	end_time = cur_time + (hz * TEST_DURATION_S);

	/* start slave cores */
	stop_slaves = 0;
	printf("Start timer manage race condition test (%u seconds)\n",
			TEST_DURATION_S);
	rte_eal_mp_remote_launch(slave_main_loop, NULL, SKIP_MASTER);

	while (diff >= 0) {
		/* run the timers */
		rte_timer_manage();

		/* wait 100 ms */
		usec_delay(100*1000);

		cur_time = rte_get_timer_cycles();
		diff = end_time - cur_time;
	}

	/* stop slave cores */
	printf("Stopping timer manage race condition test\n");
	stop_slaves = 1;
	rte_eal_mp_wait_lcore();

	/* stop timers */
	for (i = 0; i < N_TIMERS; i++) {
		ret = rte_timer_stop(&timer[i]);
		TEST_ASSERT(ret == 0, "rte_timer_stop failed");
	}

	return TEST_SUCCESS;
}

REGISTER_TEST_COMMAND(timer_racecond_autotest, test_timer_racecond);