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

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Message-ID: <20231016072204.1cb41eab@kernel.org>
Date: Mon, 16 Oct 2023 07:22:04 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Köry Maincent <kory.maincent@...tlin.com>
Cc: Andrew Lunn <andrew@...n.ch>, 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>, Richard
 Cochran <richardcochran@...il.com>, 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 12:41:34 +0200 Köry Maincent wrote:
> > Netdev vs phylib is an implementation detail of Linux.
> > I'm also surprised that you changed this.  
> 
> This is the main reason I changed this. This is Linux implementation purpose to
> know whether it should go through netdev or phylib, and then each of these
> drivers could use other timestamps which are hardware related.

For an integrated design there's 90% chance the stamping is done 
by the MAC. Even if it isn't there's no difference between PHY
and MAC in terms of quality.

But there is a big difference between MAC/PHY and DMA which would
both fall under NETDEV?