DPDK patches and discussions
 help / color / mirror / Atom feed
From: Ranjit Menon <ranjit.menon@intel.com>
To: Fady Bader <fady@mellanox.com>, <dev@dpdk.org>
Cc: <thomas@monjalon.net>, <tbashar@mellanox.com>,
	<talshn@mellanox.com>, <yohadt@mellanox.com>,
	<dmitry.kozliuk@gmail.com>, <harini.ramakrishnan@microsoft.com>,
	<ocardona@microsoft.com>, <pallavi.kadam@intel.com>
Subject: Re: [dpdk-dev] [PATCH v9 2/2] timer: support EAL functions on Windows
Date: Wed, 17 Jun 2020 15:15:51 -0700
Message-ID: <ded7afaf-dfd3-420b-713e-da16a20418e0@intel.com> (raw)
In-Reply-To: <20200617093915.16428-3-fady@mellanox.com>


On 6/17/2020 2:39 AM, Fady Bader wrote:
> Implemented the needed Windows eal timer functions.
>
> Signed-off-by: Fady Bader <fady@mellanox.com>
> ---
>   lib/librte_eal/common/meson.build       |  1 +
>   lib/librte_eal/windows/eal.c            |  6 +++
>   lib/librte_eal/windows/eal_timer.c      | 91 +++++++++++++++++++++++++++++++++
>   lib/librte_eal/windows/include/rte_os.h |  2 +
>   lib/librte_eal/windows/meson.build      |  1 +
>   5 files changed, 101 insertions(+)
>   create mode 100644 lib/librte_eal/windows/eal_timer.c
>
> diff --git a/lib/librte_eal/common/meson.build b/lib/librte_eal/common/meson.build
> index 3108442697..4bdf77922f 100644
> --- a/lib/librte_eal/common/meson.build
> +++ b/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
> diff --git a/lib/librte_eal/windows/eal.c b/lib/librte_eal/windows/eal.c
> index 427a5557fa..b6bffd3d92 100644
> --- a/lib/librte_eal/windows/eal.c
> +++ b/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) {
> diff --git a/lib/librte_eal/windows/eal_timer.c b/lib/librte_eal/windows/eal_timer.c
> new file mode 100644
> index 0000000000..59099e8942
> --- /dev/null
> +++ b/lib/librte_eal/windows/eal_timer.c
> @@ -0,0 +1,91 @@
> +/* 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 = rte_get_tsc_cycles();

I think a better implementation may be:

uint64_t start, end;

QueryPerformanceFrequency(&frequency);

start = rte_get_tsc_cycles();
QueryPerformanceCounter(&t_start);

rte_delay_us_sleep(US_PER_SEC / 10); /* 1/10 second */

.....

> +
> +	QueryPerformanceCounter(&t_start);
> +	QueryPerformanceFrequency(&frequency);
> +
> +	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);
> +}

[Snip]

ranjit m.


  reply	other threads:[~2020-06-17 22:15 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-23 14:43 [dpdk-dev] [PATCH 0/2] eal timer split and implementation for Windows Fady Bader
2020-04-23 14:43 ` [dpdk-dev] [PATCH 1/2] timer: move from common to Unix directory Fady Bader
2020-06-17  9:39   ` [dpdk-dev] [PATCH v9 0/2] eal timer split and implementation for Windows Fady Bader
2020-06-17  9:39     ` [dpdk-dev] [PATCH v9 1/2] timer: move from common to Unix directory Fady Bader
2020-06-17  9:39     ` [dpdk-dev] [PATCH v9 2/2] timer: support EAL functions on Windows Fady Bader
2020-06-17 22:15       ` Ranjit Menon [this message]
2020-06-18  7:56         ` Fady Bader
2020-06-18  6:55   ` [dpdk-dev] [PATCH v10 0/2] eal timer split and implementation for Windows Fady Bader
2020-06-18  6:55     ` [dpdk-dev] [PATCH v10 1/2] timer: move from common to Unix directory Fady Bader
2020-06-18  6:55     ` [dpdk-dev] [PATCH v10 2/2] timer: support EAL functions on Windows Fady Bader
2020-06-18 19:32     ` [dpdk-dev] [PATCH v10 0/2] eal timer split and implementation for Windows Ranjit Menon
2020-06-23 16:19       ` Thomas Monjalon
2020-04-23 14:43 ` [dpdk-dev] [PATCH 2/2] timer: support EAL functions on Windows Fady Bader
2020-04-23 15:18   ` Dmitry Kozlyuk
2020-04-24 21:32   ` Dmitry Kozlyuk

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=ded7afaf-dfd3-420b-713e-da16a20418e0@intel.com \
    --to=ranjit.menon@intel.com \
    --cc=dev@dpdk.org \
    --cc=dmitry.kozliuk@gmail.com \
    --cc=fady@mellanox.com \
    --cc=harini.ramakrishnan@microsoft.com \
    --cc=ocardona@microsoft.com \
    --cc=pallavi.kadam@intel.com \
    --cc=talshn@mellanox.com \
    --cc=tbashar@mellanox.com \
    --cc=thomas@monjalon.net \
    --cc=yohadt@mellanox.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

DPDK patches and discussions

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.dpdk.org/dev/0 dev/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 dev dev/ https://inbox.dpdk.org/dev \
		dev@dpdk.org
	public-inbox-index dev

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.dev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git