netdev - Re: [PATCH net-next v5 08/16] net: ethtool: Add a command to expose current time stamping layer

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Date: Tue, 17 Oct 2023 10:29:20 +0200
From: Köry Maincent <kory.maincent@...tlin.com>
To: Richard Cochran <richardcochran@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>, Florian
 Fainelli <florian.fainelli@...adcom.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>, "David S . Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 Jonathan Corbet <corbet@....net>, Jay Vosburgh <j.vosburgh@...il.com>, Andy
 Gospodarek <andy@...yhouse.net>, Nicolas Ferre
 <nicolas.ferre@...rochip.com>, Claudiu Beznea <claudiu.beznea@...on.dev>,
 Horatiu Vultur <horatiu.vultur@...rochip.com>,
 UNGLinuxDriver@...rochip.com, Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, Heiner Kallweit
 <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, Radu Pirea
 <radu-nicolae.pirea@....nxp.com>, Willem de Bruijn
 <willemdebruijn.kernel@...il.com>, Vladimir Oltean
 <vladimir.oltean@....com>, Michael Walle <michael@...le.cc>, Jacob Keller
 <jacob.e.keller@...el.com>, Maxime Chevallier
 <maxime.chevallier@...tlin.com>
Subject: Re: [PATCH net-next v5 08/16] net: ethtool: Add a command to expose
 current time stamping layer

On Mon, 16 Oct 2023 16:50:01 -0700
Richard Cochran <richardcochran@...il.com> wrote:

> On Mon, Oct 16, 2023 at 12:41:34PM +0200, Köry Maincent wrote:
> 
> > Still I am wondering why hardware timestamping capabilities can be enabled
> > without phc.  
> 
> There is hardware that simply provides time values on frames from a
> free running clock, and that clock cannot be read, set, or adjusted.
> 
> So the time stamps only relate to other time stamps from the same
> device.  That might be used for performance analysis.

Ok, thanks you for the information.

Köry