99a2dd955f
There is no reason for the DPDK libraries to all have 'librte_' prefix on the directory names. This prefix makes the directory names longer and also makes it awkward to add features referring to individual libraries in the build - should the lib names be specified with or without the prefix. Therefore, we can just remove the library prefix and use the library's unique name as the directory name, i.e. 'eal' rather than 'librte_eal' Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2015 Intel Corporation
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*/
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#ifndef _RTE_TIME_H_
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#define _RTE_TIME_H_
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#include <stdint.h>
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#include <time.h>
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#define NSEC_PER_SEC 1000000000L
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/**
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* Structure to hold the parameters of a running cycle counter to assist
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* in converting cycles to nanoseconds.
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*/
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struct rte_timecounter {
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/** Last cycle counter value read. */
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uint64_t cycle_last;
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/** Nanoseconds count. */
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uint64_t nsec;
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/** Bitmask separating nanosecond and sub-nanoseconds. */
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uint64_t nsec_mask;
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/** Sub-nanoseconds count. */
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uint64_t nsec_frac;
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/** Bitmask for two's complement subtraction of non-64 bit counters. */
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uint64_t cc_mask;
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/** Cycle to nanosecond divisor (power of two). */
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uint32_t cc_shift;
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};
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/**
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* Converts cyclecounter cycles to nanoseconds.
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*/
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static inline uint64_t
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rte_cyclecounter_cycles_to_ns(struct rte_timecounter *tc, uint64_t cycles)
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{
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uint64_t ns;
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/* Add fractional nanoseconds. */
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ns = cycles + tc->nsec_frac;
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tc->nsec_frac = ns & tc->nsec_mask;
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/* Shift to get only nanoseconds. */
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return ns >> tc->cc_shift;
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}
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/**
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* Update the internal nanosecond count in the structure.
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*/
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static inline uint64_t
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rte_timecounter_update(struct rte_timecounter *tc, uint64_t cycle_now)
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{
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uint64_t cycle_delta, ns_offset;
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/* Calculate the delta since the last call. */
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if (tc->cycle_last <= cycle_now)
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cycle_delta = (cycle_now - tc->cycle_last) & tc->cc_mask;
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else
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/* Handle cycle counts that have wrapped around . */
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cycle_delta = (~(tc->cycle_last - cycle_now) & tc->cc_mask) + 1;
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/* Convert to nanoseconds. */
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ns_offset = rte_cyclecounter_cycles_to_ns(tc, cycle_delta);
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/* Store current cycle counter for next call. */
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tc->cycle_last = cycle_now;
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/* Update the nanosecond count. */
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tc->nsec += ns_offset;
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return tc->nsec;
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}
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/**
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* Convert from timespec structure into nanosecond units.
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*/
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static inline uint64_t
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rte_timespec_to_ns(const struct timespec *ts)
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{
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return ((uint64_t) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
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}
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/**
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* Convert from nanosecond units into timespec structure.
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*/
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static inline struct timespec
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rte_ns_to_timespec(uint64_t nsec)
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{
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struct timespec ts = {0, 0};
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if (nsec == 0)
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return ts;
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ts.tv_sec = nsec / NSEC_PER_SEC;
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ts.tv_nsec = nsec % NSEC_PER_SEC;
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return ts;
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}
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#endif /* _RTE_TIME_H_ */
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