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

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Message-ID: <MN2PR11MB4664B05DF435E9731B7877419B4B2@MN2PR11MB4664.namprd11.prod.outlook.com>
Date: Tue, 29 Oct 2024 15:56:05 +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: [PATCH net-next v2 0/2] ptp: add control over HW timestamp latch
 point

>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-ed948f3b6887@bootlin.com/#r
Or some other idea?