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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2015 Akamai Technologies.
* All rights reserved.
*/
#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>
#include <rte_pause.h>
#ifdef RTE_EXEC_ENV_LINUX
#define usec_delay(us) usleep(us)
#else
#define usec_delay(us) rte_delay_us(us)
#endif
#define BILLION (1UL << 30)
#define TEST_DURATION_S 4 /* in seconds */
#define N_TIMERS 50
static struct rte_timer timer[N_TIMERS];
static unsigned int timer_lcore_id[N_TIMERS];
static unsigned int main_lcore;
static volatile unsigned int stop_workers;
static int reload_timer(struct rte_timer *tim);
RTE_LOG_REGISTER(timer_logtype_test, test.timer, INFO);
static void
timer_cb(struct rte_timer *tim, void *arg __rte_unused)
{
/* Simulate slow callback function, 100 us. */
rte_delay_us(100);
if (tim == &timer[0])
rte_log(RTE_LOG_DEBUG, timer_logtype_test,
"------------------------------------------------\n");
rte_log(RTE_LOG_DEBUG, timer_logtype_test, "%s: core %u timer %"
PRIuPTR "\n", __func__, rte_lcore_id(), tim - timer);
(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, main_lcore, timer_cb, NULL);
if (ret != 0) {
rte_log(RTE_LOG_DEBUG, timer_logtype_test,
"- core %u failed to reset timer %" PRIuPTR " (OK)\n",
rte_lcore_id(), tim - timer);
RTE_PER_LCORE(n_reset_collisions) += 1;
}
return ret;
}
static int
worker_main_loop(__rte_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_workers) {
/* 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;
main_lcore = 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 workers.
* Note that we assign timer[0] to the main.
*/
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 worker cores */
stop_workers = 0;
printf("Start timer manage race condition test (%u seconds)\n",
TEST_DURATION_S);
rte_eal_mp_remote_launch(worker_main_loop, NULL, SKIP_MAIN);
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 worker cores */
printf("Stopping timer manage race condition test\n");
stop_workers = 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_PERF_TEST(timer_racecond_autotest, test_timer_racecond);
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