linux-kernel - Re: [PATCH net-next v19 03/10] ptp: Add phc source and helpers to register specific PTP clock or get information

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Message-ID: <20241115101256.34300900@kmaincent-XPS-13-7390>
Date: Fri, 15 Nov 2024 10:12:56 +0100
From: Kory Maincent <kory.maincent@...tlin.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Florian Fainelli <florian.fainelli@...adcom.com>, Broadcom internal
 kernel review list <bcm-kernel-feedback-list@...adcom.com>, Andrew Lunn
 <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, Russell King
 <linux@...linux.org.uk>, "David S. Miller" <davem@...emloft.net>, Eric
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 Gospodarek <andy@...yhouse.net>, Nicolas Ferre
 <nicolas.ferre@...rochip.com>, Claudiu Beznea <claudiu.beznea@...on.dev>,
 Willem de Bruijn <willemdebruijn.kernel@...il.com>, Jonathan Corbet
 <corbet@....net>, Horatiu Vultur <horatiu.vultur@...rochip.com>,
 UNGLinuxDriver@...rochip.com, Simon Horman <horms@...nel.org>, Vladimir
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 danieller@...dia.com, ecree.xilinx@...il.com, Andrew Lunn
 <andrew+netdev@...n.ch>, Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 linux-doc@...r.kernel.org, Maxime Chevallier
 <maxime.chevallier@...tlin.com>, Rahul Rameshbabu <rrameshbabu@...dia.com>,
 Willem de Bruijn <willemb@...gle.com>, Shannon Nelson
 <shannon.nelson@....com>, Alexandra Winter <wintera@...ux.ibm.com>, Jacob
 Keller <jacob.e.keller@...el.com>
Subject: Re: [PATCH net-next v19 03/10] ptp: Add phc source and helpers to
 register specific PTP clock or get information

On Thu, 14 Nov 2024 17:39:06 -0800
Jakub Kicinski <kuba@...nel.org> wrote:

> On Thu, 14 Nov 2024 11:46:10 +0100 Kory Maincent wrote:
>  [...]  
> > > 
> > > In net_device? Yes, I think so.    
> >  
> > Also as the "user" is not described in the ptp_clock structure the only way
> > to find it is to roll through all the PTP of the concerned net device
> > topology. This find ptp loop will not be in the hotpath but only when
> > getting the tsinfo of a PHC or changing the current PHC. Is it ok for you?  
> 
> I think so :) We need to be able to figure out if it's the MAC PHC
> quickly, because MAC timestamping can be high rate. But IIUC PHY
> timestamping will usually involve async work and slow buses, so
> walking all PHYs of a netdev should be fine. Especially that 99%
> of the time there will only be one. Hope I understood the question..

Yes, thanks for the confirmation. 

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com