DPDK 21.11.0
rte_time.h
1/* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2015 Intel Corporation
3 */
4
5#ifndef _RTE_TIME_H_
6#define _RTE_TIME_H_
7
8#include <stdint.h>
9#include <time.h>
10
11#define NSEC_PER_SEC 1000000000L
12
19 uint64_t cycle_last;
21 uint64_t nsec;
23 uint64_t nsec_mask;
25 uint64_t nsec_frac;
27 uint64_t cc_mask;
29 uint32_t cc_shift;
30};
31
35static inline uint64_t
36rte_cyclecounter_cycles_to_ns(struct rte_timecounter *tc, uint64_t cycles)
37{
38 uint64_t ns;
39
40 /* Add fractional nanoseconds. */
41 ns = cycles + tc->nsec_frac;
42 tc->nsec_frac = ns & tc->nsec_mask;
43
44 /* Shift to get only nanoseconds. */
45 return ns >> tc->cc_shift;
46}
47
51static inline uint64_t
52rte_timecounter_update(struct rte_timecounter *tc, uint64_t cycle_now)
53{
54 uint64_t cycle_delta, ns_offset;
55
56 /* Calculate the delta since the last call. */
57 if (tc->cycle_last <= cycle_now)
58 cycle_delta = (cycle_now - tc->cycle_last) & tc->cc_mask;
59 else
60 /* Handle cycle counts that have wrapped around . */
61 cycle_delta = (~(tc->cycle_last - cycle_now) & tc->cc_mask) + 1;
62
63 /* Convert to nanoseconds. */
64 ns_offset = rte_cyclecounter_cycles_to_ns(tc, cycle_delta);
65
66 /* Store current cycle counter for next call. */
67 tc->cycle_last = cycle_now;
68
69 /* Update the nanosecond count. */
70 tc->nsec += ns_offset;
71
72 return tc->nsec;
73}
74
78static inline uint64_t
79rte_timespec_to_ns(const struct timespec *ts)
80{
81 return ((uint64_t) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
82}
83
87static inline struct timespec
88rte_ns_to_timespec(uint64_t nsec)
89{
90 struct timespec ts = {0, 0};
91
92 if (nsec == 0)
93 return ts;
94
95 ts.tv_sec = nsec / NSEC_PER_SEC;
96 ts.tv_nsec = nsec % NSEC_PER_SEC;
97
98 return ts;
99}
100
101#endif /* _RTE_TIME_H_ */
uint64_t cycle_last
Definition: rte_time.h:19
uint64_t nsec_mask
Definition: rte_time.h:23
uint32_t cc_shift
Definition: rte_time.h:29
uint64_t nsec_frac
Definition: rte_time.h:25
uint64_t nsec
Definition: rte_time.h:21
uint64_t cc_mask
Definition: rte_time.h:27