Re: [PATCH v4 net-next 0/7] ptp: Add PHC timestamp quality attributes

[Richard Cochran <richardcochran@gmail.com>]

On Tue, Jul 14, 2026 at 02:03:01AM +0000, Arthur Kiyanovski wrote:
> This series adds quality attributes to PTP Hardware Clock (PHC)
> timestamps, allowing userspace to obtain error bound, clock status,
> timescale, and system counter values alongside timestamps in a single
> call.
> 
> Motivation
> ----------
> The existing PTP APIs return timestamps without any indication of
> their quality. Applications that need clock accuracy and
> synchronization status commonly rely on external tools such as
> ptp4l, which implement synchronization logic and can export their
> measurement of clock accuracy.

Yes, and what is wrong with that?  Nothing, AFAICT

? For managed PHC devices — such as
> the ENA network adapter, whose clock is synchronized by the device
> without userspace involvement — these tools are not available, and
> the existing APIs lack a way to report quality metrics to consumers
> of time.

So make some user space tool that advertises your device's qualities.

Don't push this stuff into the kernel, where it doesn't belong.

Thanks,
Richard