linux-kernel - Re: [PATCH net-next] ptp: add vclock timestamp conversion IOCTL

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Date:   Mon, 27 Sep 2021 11:28:32 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Sebastien Laveze <sebastien.laveze@....nxp.com>,
        Richard Cochran <richardcochran@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        yangbo.lu@....com
Cc:     yannick.vignon@....nxp.com, rui.sousa@....nxp.com
Subject: Re: [PATCH net-next] ptp: add vclock timestamp conversion IOCTL

On 9/27/21 2:32 AM, Sebastien Laveze wrote:
> From: Seb Laveze <sebastien.laveze@....com>
> 
> Add an IOCTL to perform per-timestamp conversion, as an extension of the
> ptp virtual framework introduced in commit 5d43f951b1ac ("ptp: add ptp
> virtual clock driver framework").
> 
> The original implementation allows binding a socket to a given virtual
> clock to perform the timestamps conversions. Commit 5d43f951b1ac ("ptp:
> add ptp virtual clock driver framework").
> 
> This binding works well if the application requires all timestamps in the
> same domain but is not convenient when multiple domains need to be
> supported using a single socket.
> 
> Typically, IEEE 802.1AS-2020 can be implemented using a single socket,
> the CMLDS layer using raw PHC timestamps and the domain specific
> timestamps converted in the appropriate gPTP domain using this IOCTL.
> 
> Signed-off-by: Seb Laveze <sebastien.laveze@....com>
> ---
>   drivers/ptp/ptp_chardev.c      | 24 ++++++++++++++++++++++++
>   include/uapi/linux/ptp_clock.h |  1 +
>   2 files changed, 25 insertions(+)
> 

> diff --git a/include/uapi/linux/ptp_clock.h b/include/uapi/linux/ptp_clock.h
> index 1d108d597f66..13147d454aa8 100644
> --- a/include/uapi/linux/ptp_clock.h
> +++ b/include/uapi/linux/ptp_clock.h
> @@ -223,6 +223,7 @@ struct ptp_pin_desc {
>   	_IOWR(PTP_CLK_MAGIC, 17, struct ptp_sys_offset_precise)
>   #define PTP_SYS_OFFSET_EXTENDED2 \
>   	_IOWR(PTP_CLK_MAGIC, 18, struct ptp_sys_offset_extended)
> +#define PTP_VCLOCK_CONV_TS  _IOWR(PTP_CLK_MAGIC, 19, struct __kernel_timespec)
>   
>   struct ptp_extts_event {
>   	struct ptp_clock_time t; /* Time event occured. */
> 

Hi,
Would someone please update Documentation/userspace-api/ioctl/ioctl-number.rst
to include
#define PTP_CLK_MAGIC '=', the name of this header file, and optional
comment or contact info, please.

thanks.
-- 
~Randy