netdev - Re: [PATCH net-next RFC v4 2/5] net: Expose available time stamping layers to user space.

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Message-ID: <ZGvK0aBhluD0OxWp@hoboy.vegasvil.org>
Date: Mon, 22 May 2023 13:04:33 -0700
From: Richard Cochran <richardcochran@...il.com>
To: "Zulkifli, Muhammad Husaini" <muhammad.husaini.zulkifli@...el.com>
Cc: Jakub Kicinski <kuba@...nel.org>,
	Vladimir Oltean <vladimir.oltean@....com>,
	"Russell King (Oracle)" <linux@...linux.org.uk>,
	Andrew Lunn <andrew@...n.ch>,
	Köry Maincent <kory.maincent@...tlin.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"glipus@...il.com" <glipus@...il.com>,
	"maxime.chevallier@...tlin.com" <maxime.chevallier@...tlin.com>,
	"vadim.fedorenko@...ux.dev" <vadim.fedorenko@...ux.dev>,
	"gerhard@...leder-embedded.com" <gerhard@...leder-embedded.com>,
	"thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
	"krzysztof.kozlowski+dt@...aro.org" <krzysztof.kozlowski+dt@...aro.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"Keller, Jacob E" <jacob.e.keller@...el.com>
Subject: Re: [PATCH net-next RFC v4 2/5] net: Expose available time stamping
 layers to user space.

On Mon, May 22, 2023 at 03:56:36AM +0000, Zulkifli, Muhammad Husaini wrote:

> A controller may only support one HW Timestamp (PHY/Port) and one MAC Timestamp 
> (DMA Timestamp) for packet timestamp activity. If a PTP packet has used the HW Timestamp (PHY/Port), 

This is wrong.

The time stamping setting is global, at the device level, not at the
socket.  And that is not going to change.  This series is about
selecting between MAC/PHY time stamping globally, at the device level.

Thanks,
Richard