netdev - Re: [PATCH net-next v7 15/16] net: ethtool: ts: Let the active time stamping layer be selectable

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Date: Wed, 29 Nov 2023 15:56:13 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Köry Maincent <kory.maincent@...tlin.com>
Cc: Vladimir Oltean <vladimir.oltean@....com>, Andrew Lunn <andrew@...n.ch>,
 Florian Fainelli <florian.fainelli@...adcom.com>, Broadcom internal kernel
 review list <bcm-kernel-feedback-list@...adcom.com>, Heiner Kallweit
 <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo
 Abeni <pabeni@...hat.com>, Richard Cochran <richardcochran@...il.com>, Radu
 Pirea <radu-nicolae.pirea@....nxp.com>, Jay Vosburgh
 <j.vosburgh@...il.com>, Andy 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>, Thomas
 Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, Maxime Chevallier
 <maxime.chevallier@...tlin.com>, rrameshbabu@...dia.com
Subject: Re: [PATCH net-next v7 15/16] net: ethtool: ts: Let the active time
 stamping layer be selectable

On Wed, 29 Nov 2023 23:00:34 +0100 Köry Maincent wrote:
> > Not sure why you say "not used", though. Are you not planning to expose
> > the qualifier as an attribute to the listing of hwtstamp providers
> > offered to user space by ETHTOOL_MSG_TSINFO_GET?  
> 
> Yes I will, I was just saying that all the PHC would be set as precise for now.
> Approximate timestamp quality won't be used because IIUC there are no NIC driver
> supporting it yet.

Agreed that we should add the attr from the start.

Maybe we can ask/work with Rahul <rrameshbabu@...dia.com>
to implement the right thing in mlx5?

Failing that we can mark mlx5 as imprecise, until its sorted out.
So that we have both types in the tree.