netdev - Re: [PATCH net-next v13 01/13] rtase: Add pci table supported in this module

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Date: Sat, 2 Dec 2023 17:27:57 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Justin Lai <justinlai0215@...ltek.com>, davem@...emloft.net,
	edumazet@...gle.com, pabeni@...hat.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	pkshih@...ltek.com, larry.chiu@...ltek.com
Subject: Re: [PATCH net-next v13 01/13] rtase: Add pci table supported in
 this module

On Fri, Dec 01, 2023 at 08:36:02PM -0800, Jakub Kicinski wrote:
> On Thu, 30 Nov 2023 19:43:15 +0800 Justin Lai wrote:
> > + *  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.
> > + *  In addition, this driver is mainly used to control GMAC, but does not
> > + *  control the switch core, so it is not the same as DSA.
> 
> Okay, but you seem to only register one netdev.
> 
> Which MAC is it for?

The GMAC one. This is going to be a DSA system, and this driver is for
the conduit MAC the CPU uses. At some point, i hope there is a DSA
driver added, or the existing realtek driver is extended to support
this switch.

       Andrew