timer: support EAL functions on Windows

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>

lib/librte_eal/common/meson.build

@@ -26,6 +26,7 @@ if is_windows
 		'malloc_elem.c',
 		'malloc_heap.c',
 		'rte_malloc.c',
+		'eal_common_timer.c',
 	)
 	subdir_done()
 endif

lib/librte_eal/windows/eal.c

@@ -354,6 +354,12 @@ rte_eal_init(int argc, char **argv)
 		return -1;
 	}
 
+	if (rte_eal_timer_init() < 0) {
+		rte_eal_init_alert("Cannot init TSC timer");
+		rte_errno = EFAULT;
+		return -1;
+	}
+
 	eal_thread_init_master(rte_config.master_lcore);
 
 	RTE_LCORE_FOREACH_SLAVE(i) {

lib/librte_eal/windows/eal_timer.c

@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2020 Mellanox Technologies, Ltd
+ */
+
+#include <inttypes.h>
+
+#include <rte_windows.h>
+#include <rte_common.h>
+#include <rte_cycles.h>
+#include <rte_eal.h>
+#include <rte_errno.h>
+#include "eal_private.h"
+
+#define US_PER_SEC 1E6
+#define CYC_PER_10MHZ 1E7
+
+void
+rte_delay_us_sleep(unsigned int us)
+{
+	HANDLE timer;
+	LARGE_INTEGER due_time;
+
+	/* create waitable timer */
+	timer = CreateWaitableTimer(NULL, TRUE, NULL);
+	if (!timer) {
+		RTE_LOG_WIN32_ERR("CreateWaitableTimer()");
+		rte_errno = ENOMEM;
+		return;
+	}
+
+	/*
+	 * due_time's uom is 100 ns, multiply by 10 to convert to microseconds
+	 * set us microseconds time for timer
+	 */
+	due_time.QuadPart = -((int64_t)us * 10);
+	if (!SetWaitableTimer(timer, &due_time, 0, NULL, NULL, FALSE)) {
+		RTE_LOG_WIN32_ERR("SetWaitableTimer()");
+		rte_errno = EINVAL;
+		goto end;
+	}
+	/* start wait for timer for us microseconds */
+	if (WaitForSingleObject(timer, INFINITE) == WAIT_FAILED) {
+		RTE_LOG_WIN32_ERR("WaitForSingleObject()");
+		rte_errno = EINVAL;
+	}
+
+end:
+	CloseHandle(timer);
+}
+
+uint64_t
+get_tsc_freq(void)
+{
+	LARGE_INTEGER t_start, t_end, elapsed_us;
+	LARGE_INTEGER frequency;
+	uint64_t tsc_hz;
+	uint64_t end, start;
+
+	QueryPerformanceFrequency(&frequency);
+
+	QueryPerformanceCounter(&t_start);
+	start = rte_get_tsc_cycles();
+
+	rte_delay_us_sleep(US_PER_SEC / 10); /* 1/10 second */
+
+	if (rte_errno != 0)
+		return 0;
+
+	QueryPerformanceCounter(&t_end);
+	end = rte_get_tsc_cycles();
+
+	elapsed_us.QuadPart = t_end.QuadPart - t_start.QuadPart;
+
+	/*
+	 * To guard against loss-of-precision, convert to microseconds
+	 * *before* dividing by ticks-per-second.
+	 */
+	elapsed_us.QuadPart *= US_PER_SEC;
+	elapsed_us.QuadPart /= frequency.QuadPart;
+
+	double secs = ((double)elapsed_us.QuadPart)/US_PER_SEC;
+	tsc_hz = (uint64_t)((end - start)/secs);
+
+	/* Round up to 10Mhz. 1E7 ~ 10Mhz */
+	return RTE_ALIGN_MUL_NEAR(tsc_hz, CYC_PER_10MHZ);
+}
+
+
+int
+rte_eal_timer_init(void)
+{
+	set_tsc_freq();
+	return 0;
+}

lib/librte_eal/windows/include/rte_os.h

@@ -25,6 +25,8 @@ extern "C" {
 #define PATH_MAX _MAX_PATH
 #endif
 
+#define sleep(x) Sleep(1000 * (x))
+
 #define strerror_r(a, b, c) strerror_s(b, c, a)
 
 /* strdup is deprecated in Microsoft libc and _strdup is preferred */

lib/librte_eal/windows/meson.build

@@ -14,6 +14,7 @@ sources += files(
 	'eal_memory.c',
 	'eal_mp.c',
 	'eal_thread.c',
+	'eal_timer.c',
 	'fnmatch.c',
 	'getopt.c',
 )