netdev - Re: [RFC PATCH net-next] ptp: Introduce PTP_SYS_OFFSET_EXTENDED

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Message-ID: <aIMDc8JC4prOmpLQ@hoboy.vegasvil.org>
Date: Thu, 24 Jul 2025 21:09:23 -0700
From: Richard Cochran <richardcochran@...il.com>
To: David Arinzon <darinzon@...zon.com>
Cc: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	"Woodhouse, David" <dwmw@...zon.com>, Andrew Lunn <andrew@...n.ch>,
	Miroslav Lichvar <mlichvar@...hat.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>, netdev@...r.kernel.org,
	"Machulsky, Zorik" <zorik@...zon.com>,
	"Matushevsky, Alexander" <matua@...zon.com>,
	Saeed Bshara <saeedb@...zon.com>, "Wilson, Matt" <msw@...zon.com>,
	"Liguori, Anthony" <aliguori@...zon.com>,
	"Bshara, Nafea" <nafea@...zon.com>,
	"Schmeilin, Evgeny" <evgenys@...zon.com>,
	"Belgazal, Netanel" <netanel@...zon.com>,
	"Saidi, Ali" <alisaidi@...zon.com>,
	"Herrenschmidt, Benjamin" <benh@...zon.com>,
	"Kiyanovski, Arthur" <akiyano@...zon.com>,
	"Dagan, Noam" <ndagan@...zon.com>,
	"Bernstein, Amit" <amitbern@...zon.com>,
	"Ostrovsky, Evgeny" <evostrov@...zon.com>,
	"Tabachnik, Ofir" <ofirt@...zon.com>,
	Julien Ridoux <ridouxj@...zon.com>,
	Josh Levinson <joshlev@...zon.com>
Subject: Re: [RFC PATCH net-next] ptp: Introduce
 PTP_SYS_OFFSET_EXTENDED_TRUSTED ioctl

On Thu, Jul 24, 2025 at 02:56:56PM +0300, David Arinzon wrote:

> The first objective focuses on the use case where the PHC device
> is fully managed. The ENA driver, for example, exposes a PHC
> device, whose synchronization status and quality is maintained
> without any user-space application. This new ioctl reports on the
> clock accuracy and status of the PHC device to user-space
> applications, where ptp4l and similar are not available.

This seems pretty rare.  I can't think of any other hardware that
makes claims about synchronization quality.

So this ioctl would be just for one device.

Thanks,
Richard