540fbc2786
Implemented the needed Windows eal timer functions. Signed-off-by: Fady Bader <fady@mellanox.com> Reviewed-by: Tal Shnaiderman <talshn@mellanox.com> Tested-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com> Acked-by: Ranjit Menon <ranjit.menon@intel.com>
95 lines
1.9 KiB
C
95 lines
1.9 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright 2020 Mellanox Technologies, Ltd
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*/
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#include <inttypes.h>
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#include <rte_windows.h>
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#include <rte_common.h>
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#include <rte_cycles.h>
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#include <rte_eal.h>
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#include <rte_errno.h>
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#include "eal_private.h"
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#define US_PER_SEC 1E6
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#define CYC_PER_10MHZ 1E7
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void
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rte_delay_us_sleep(unsigned int us)
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{
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HANDLE timer;
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LARGE_INTEGER due_time;
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/* create waitable timer */
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timer = CreateWaitableTimer(NULL, TRUE, NULL);
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if (!timer) {
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RTE_LOG_WIN32_ERR("CreateWaitableTimer()");
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rte_errno = ENOMEM;
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return;
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}
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/*
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* due_time's uom is 100 ns, multiply by 10 to convert to microseconds
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* set us microseconds time for timer
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*/
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due_time.QuadPart = -((int64_t)us * 10);
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if (!SetWaitableTimer(timer, &due_time, 0, NULL, NULL, FALSE)) {
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RTE_LOG_WIN32_ERR("SetWaitableTimer()");
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rte_errno = EINVAL;
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goto end;
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}
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/* start wait for timer for us microseconds */
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if (WaitForSingleObject(timer, INFINITE) == WAIT_FAILED) {
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RTE_LOG_WIN32_ERR("WaitForSingleObject()");
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rte_errno = EINVAL;
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}
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end:
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CloseHandle(timer);
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}
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uint64_t
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get_tsc_freq(void)
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{
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LARGE_INTEGER t_start, t_end, elapsed_us;
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LARGE_INTEGER frequency;
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uint64_t tsc_hz;
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uint64_t end, start;
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QueryPerformanceFrequency(&frequency);
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QueryPerformanceCounter(&t_start);
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start = rte_get_tsc_cycles();
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rte_delay_us_sleep(US_PER_SEC / 10); /* 1/10 second */
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if (rte_errno != 0)
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return 0;
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QueryPerformanceCounter(&t_end);
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end = rte_get_tsc_cycles();
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elapsed_us.QuadPart = t_end.QuadPart - t_start.QuadPart;
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/*
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* To guard against loss-of-precision, convert to microseconds
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* *before* dividing by ticks-per-second.
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*/
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elapsed_us.QuadPart *= US_PER_SEC;
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elapsed_us.QuadPart /= frequency.QuadPart;
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double secs = ((double)elapsed_us.QuadPart)/US_PER_SEC;
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tsc_hz = (uint64_t)((end - start)/secs);
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/* Round up to 10Mhz. 1E7 ~ 10Mhz */
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return RTE_ALIGN_MUL_NEAR(tsc_hz, CYC_PER_10MHZ);
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}
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int
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rte_eal_timer_init(void)
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{
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set_tsc_freq();
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return 0;
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}
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