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git.proxmox.com Git - ceph.git/blob - ceph/src/spdk/dpdk/test/test/test_cycles.c
1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
8 #include <rte_common.h>
9 #include <rte_cycles.h>
19 * - Loop N times and check that the timer always increments and
20 * never decrements during this loop.
22 * - Wait one second using rte_usleep() and check that the increment
23 * of cycles is correct with regard to the frequency of the timer.
30 uint64_t start_cycles
, cycles
, prev_cycles
;
31 uint64_t hz
= rte_get_timer_hz();
32 uint64_t max_inc
= (hz
/ 100); /* 10 ms max between 2 reads */
34 /* check that the timer is always incrementing */
35 start_cycles
= rte_get_timer_cycles();
36 prev_cycles
= start_cycles
;
38 cycles
= rte_get_timer_cycles();
39 if ((uint64_t)(cycles
- prev_cycles
) > max_inc
) {
40 printf("increment too high or going backwards\n");
46 /* check that waiting 1 second is precise */
47 prev_cycles
= rte_get_timer_cycles();
48 rte_delay_us(1000000);
49 cycles
= rte_get_timer_cycles();
51 if ((uint64_t)(cycles
- prev_cycles
) > (hz
+ max_inc
)) {
52 printf("delay_us is not accurate: too long\n");
55 if ((uint64_t)(cycles
- prev_cycles
) < (hz
- max_inc
)) {
56 printf("delay_us is not accurate: too short\n");
63 REGISTER_TEST_COMMAND(cycles_autotest
, test_cycles
);
66 * rte_delay_us_callback test
68 * - check if callback is correctly registered/unregistered
72 static unsigned int pattern
;
73 static void my_rte_delay_us(unsigned int us
)
79 test_user_delay_us(void)
87 /* register custom delay function */
88 rte_delay_us_callback_register(my_rte_delay_us
);
98 /* restore original delay function */
99 rte_delay_us_callback_register(rte_delay_us_block
);
108 REGISTER_TEST_COMMAND(user_delay_us
, test_user_delay_us
);