linux-kernel - Re: [PATCH net-next v3 1/2] ptp: add control over HW timestamp latch point

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Message-ID: <20241105180457.01c54f15@kernel.org>
Date: Tue, 5 Nov 2024 18:04:57 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 intel-wired-lan@...ts.osuosl.org, anthony.l.nguyen@...el.com,
 przemyslaw.kitszel@...el.com, davem@...emloft.net, edumazet@...gle.com,
 pabeni@...hat.com, richardcochran@...il.com, Aleksandr Loktionov
 <aleksandr.loktionov@...el.com>
Subject: Re: [PATCH net-next v3 1/2] ptp: add control over HW timestamp
 latch point

On Wed,  6 Nov 2024 02:07:55 +0100 Arkadiusz Kubalewski wrote:
> +What:		/sys/class/ptp/ptp<N>/ts_point
> +Date:		October 2024
> +Contact:	Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
> +Description:
> +		This file provides control over the point in time in
> +		which the HW timestamp is latched. As specified in IEEE
> +		802.3cx, the latch point can be either at the beginning
> +		or after the end of Start of Frame Delimiter (SFD).
> +		Value "1" means the timestamp is latched at the
> +		beginning of the SFD. Value "2" means that timestamp is
> +		latched after the end of SFD.

Richard has the final say but IMO packet timestamping config does not
belong to the PHC, rather ndo_hwtstamp_set.