linux-kernel - RE: [Intel-wired-lan] [PATCH net-next v2 0/2] ptp: add control over HW timestamp latch point

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Message-ID: <MW3PR11MB466680659C24F17A64B37A279B532@MW3PR11MB4666.namprd11.prod.outlook.com>
Date: Wed, 6 Nov 2024 01:15:11 +0000
From: "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>
To: Vadim Fedorenko <vadim.fedorenko@...ux.dev>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "intel-wired-lan@...ts.osuosl.org"
	<intel-wired-lan@...ts.osuosl.org>
CC: "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>, "Kitszel, Przemyslaw"
	<przemyslaw.kitszel@...el.com>, "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"richardcochran@...il.com" <richardcochran@...il.com>
Subject: RE: [Intel-wired-lan] [PATCH net-next v2 0/2] ptp: add control over
 HW timestamp latch point

>From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
>Vadim Fedorenko
>Sent: Tuesday, October 29, 2024 5:17 PM
>
>On 29/10/2024 15:56, Kubalewski, Arkadiusz wrote:
>>> From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
>>> Sent: Tuesday, October 29, 2024 12:30 PM
>>>
>>> On 28/10/2024 20:47, Arkadiusz Kubalewski wrote:
>>>> HW support of PTP/timesync solutions in network PHY chips can be
>>>> achieved with two different approaches, the timestamp maybe latched
>>>> either in the beginning or after the Start of Frame Delimiter (SFD)
>>>>[1].
>>>>
>>>> Allow ptp device drivers to provide user with control over the
>>>> timestamp latch point.
>>>>
>>>> [1] https://www.ieee802.org/3/cx/public/april20/tse_3cx_01_0420.pdf
>>>
>>> I just wonder should we add ethtool interface to control this feature.
>>> As we are adding it for phy devices, it's good idea to have a way to
>>> control it through eth device too. WDYT?
>>
>> Seems doable, I guess somehow expand the controllability being added
>> right now with this series:
>> https://lore.kernel.org/netdev/20241023-feature_ptp_netnext-v18-0-ed94
>> 8f3b6887@...tlin.com/#r
>> Or some other idea?
>
>Yeah, the series mentioned correlates with your work, that's why I asked
>about it.
>It would be great to be sure that the interface you are proposing can be
>reused or somehow combined with the series.

Sure, I did some modifications to allow this extension in the future, as
this is still being developed.

Thank you!
Arkadiusz