linux-kernel - Re: net: dsa: Realtek switch drivers

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Message-ID: <65566aaa-ba49-4ad9-ab3f-9d49780a809b@lunn.ch>
Date: Wed, 3 Jul 2024 05:39:49 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc: Luiz Angelo Daros de Luca <luizluca@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	"alsi@...g-olufsen.dk" <alsi@...g-olufsen.dk>,
	Florian Fainelli <f.fainelli@...il.com>,
	"olteanv@...il.com" <olteanv@...il.com>,
	Marek Behún <kabel@...nel.org>,
	"ericwouds@...il.com" <ericwouds@...il.com>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	"kuba@...nel.org" <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	"justinstitt@...gle.com" <justinstitt@...gle.com>,
	"rmk+kernel@...linux.org.uk" <rmk+kernel@...linux.org.uk>,
	netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"sander@...nheule.net" <sander@...nheule.net>
Subject: Re: net: dsa: Realtek switch drivers

> One reason for using DSAI've just found is that in theory the RTL930x
> supports a CPU disabled mode where you do connect it to an external CPU and
> the data travels over SGMII like you'd get with a traditional DSA design.
> It's not a mode I'm planning on supporting anytime soon but it might come up
> when I get round to submitting some patches.

You might want to look at ocelot, which is both a pure switchdev and a
DSA driver. Its design is not great because it became dual later in
its life. I suspect it would be designed differently if this has been
considered at the beginning.

	   Andrew