netdev - RE: [RFC 0/3] ptp: Add esterror support

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Message-ID: <e61e087d636c44cba4aa94cc414e921c@amazon.com>
Date: Thu, 15 Aug 2024 11:40:37 +0000
From: "Arinzon, David" <darinzon@...zon.com>
To: Vadim Fedorenko <vadfed@...a.com>, Maciek Machnikowski
	<maciek@...hnikowski.net>, "kuba@...nel.org" <kuba@...nel.org>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"richardcochran@...il.com" <richardcochran@...il.com>,
	"jacob.e.keller@...el.com" <jacob.e.keller@...el.com>, "Bernstein, Amit"
	<amitbern@...zon.com>
Subject: RE: [RFC 0/3] ptp: Add esterror support

> >
> >
> > On 15/08/2024 02:41, Jakub Kicinski wrote:
> >> On Tue, 13 Aug 2024 12:55:59 +0000 Maciek Machnikowski wrote:
> >>> This patch series implements handling of timex esterror field by ptp
> >>> devices.
> >>>
> >>> Esterror field can be used to return or set the estimated error of
> >>> the clock. This is useful for devices containing a hardware clock
> >>> that is controlled and synchronized internally (such as a time card)
> >>> or when the synchronization is pushed to the embedded CPU of a DPU.
> >>>
> >>> Current implementation of ADJ_ESTERROR can enable pushing current
> >>> offset of the clock calculated by a userspace app to the device,
> >>> which can act upon this information by enabling or disabling
> >>> time-related functions when certain boundaries are not met (eg.
> >>> packet launchtime)
> >>
> >> Please do CC people who are working on the VM / PTP / vdso thing, and
> >> time people like tglx. And an implementation for a real device would
> >> be nice to establish attention.
> >
> > Noted - will CC in future releases.
> >
> > AWS planned the implementation in ENA driver - will work with David on
> > making it part of the patchset once we "upgrade" from an RFC - but
> > wanted to discuss the approach first.
> 
> I can implement the interface for OCP TimeCard too, I think we have HW
> information about it already.

CC Amit Bernstein (AWS, ENA driver).