linux-kernel - Re: [PATCH net-next v19 01/13] rtase: Add pci table supported in this module

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Message-ID: <eb543843-306f-42de-9fd1-6711753f007f@lunn.ch>
Date: Sun, 26 May 2024 00:44:03 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Larry Chiu <larry.chiu@...ltek.com>
Cc: Justin Lai <justinlai0215@...ltek.com>,
	"kuba@...nel.org" <kuba@...nel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>,
	"pabeni@...hat.com" <pabeni@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"jiri@...nulli.us" <jiri@...nulli.us>,
	"horms@...nel.org" <horms@...nel.org>,
	Ping-Ke Shih <pkshih@...ltek.com>
Subject: Re: [PATCH net-next v19 01/13] rtase: Add pci table supported in
 this module

> Yes, STP, IGMP snooping, ... are working as you said. However, PTP may
> have other special design to synchronize time with the other ports, and I
> may not be able to explain in detail here.

So long as Linux only plays the roll of a normal leaf node, that
should be O.K. Since you don't have a PHY, you need this MAC driver to
do the time stamping of PTP packets received by this MAC using the
MACs PHC.

Linux cannot be involved in synchronisation between ports because it
has no knowledge there are ports. Switch firmware will need to
synchronize the switches PHC with the upstream source, and send PTP
messages out ports, including the port towards Linux.

      Andrew