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Diffstat (limited to 'test/test/test_timer_racecond.c')
| -rw-r--r-- | test/test/test_timer_racecond.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/test/test/test_timer_racecond.c b/test/test/test_timer_racecond.c new file mode 100644 index 00000000..7824ec4b --- /dev/null +++ b/test/test/test_timer_racecond.c @@ -0,0 +1,205 @@ +/*- + * 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); |