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

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Date: Tue, 21 May 2024 06:20:04 +0000
From: Larry Chiu <larry.chiu@...ltek.com>
To: Justin Lai <justinlai0215@...ltek.com>, Andrew Lunn <andrew@...n.ch>
CC: "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


>> + *  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

Hi Andrew,
This GMAC is configured after the switch is boot-up and does not require a switch driver to work.