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

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Message-ID: <d840e007-c819-42df-bc71-536328d4f5d7@lunn.ch>
Date: Fri, 17 May 2024 15:49:39 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Justin Lai <justinlai0215@...ltek.com>
Cc: kuba@...nel.org, davem@...emloft.net, edumazet@...gle.com,
	pabeni@...hat.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, jiri@...nulli.us, horms@...nel.org,
	rkannoth@...vell.com, pkshih@...ltek.com, larry.chiu@...ltek.com
Subject: Re: [PATCH net-next v19 01/13] rtase: Add pci table supported in
 this module

> + *  Below is a simplified block diagram of the chip and its relevant interfaces.
> + *
> + *               *************************
> + *               *                       *
> + *               *  CPU network device   *
> + *               *                       *
> + *               *   +-------------+     *
> + *               *   |  PCIE Host  |     *
> + *               ***********++************
> + *                          ||
> + *                         PCIE
> + *                          ||
> + *      ********************++**********************
> + *      *            | PCIE Endpoint |             *
> + *      *            +---------------+             *
> + *      *                | GMAC |                  *
> + *      *                +--++--+  Realtek         *
> + *      *                   ||     RTL90xx Series  *
> + *      *                   ||                     *
> + *      *     +-------------++----------------+    *
> + *      *     |           | MAC |             |    *
> + *      *     |           +-----+             |    *
> + *      *     |                               |    *
> + *      *     |     Ethernet Switch Core      |    *
> + *      *     |                               |    *
> + *      *     |   +-----+           +-----+   |    *
> + *      *     |   | MAC |...........| MAC |   |    *
> + *      *     +---+-----+-----------+-----+---+    *
> + *      *         | PHY |...........| PHY |        *
> + *      *         +--++-+           +--++-+        *
> + *      *************||****************||***********
> + *
> + *  The block of the Realtek RTL90xx series is our entire chip architecture,
> + *  the GMAC is connected to the switch core, and there is no PHY in between.

Given this architecture, this driver cannot be used unless there is a
switch driver as well. This driver is nearly ready to be merged. So
what are your plans for the switch driver? Do you have a first version
you can post? That will reassure us you do plan to release a switch
driver, and not use a SDK in userspace.

	Andrew