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

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Message-ID: <38459609-c0a3-434a-aeba-31dd56eb96f8@machnikowski.net>
Date: Thu, 15 Aug 2024 11:35:46 +0200
From: Maciek Machnikowski <maciek@...hnikowski.net>
To: Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org, richardcochran@...il.com,
 jacob.e.keller@...el.com, vadfed@...a.com, darinzon@...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.