linux-kernel - Re: [PATCH net-next 2/2] net: dsa: microchip: add KSZ8 change_tag

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Message-ID: <90009327-df9d-4ed7-ac6c-be87065421ba@lunn.ch>
Date: Mon, 19 Aug 2024 15:05:56 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Pieter <vtpieter@...il.com>
Cc: Vladimir Oltean <olteanv@...il.com>,
	Woojung Huh <woojung.huh@...rochip.com>,
	UNGLinuxDriver@...rochip.com,
	Florian Fainelli <f.fainelli@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Russell King <linux@...linux.org.uk>,
	Pieter Van Trappen <pieter.van.trappen@...n.ch>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] net: dsa: microchip: add KSZ8
 change_tag_protocol support

> Previously I could not use DSA because of the macb driver limitation, now
> fixed (max_mtu increase, submitted here). Once I got that working, I notice
> that full DSA was not a compatible use case for my board because of
> requiring the conduit interface to behave as a regular ethernet interface.
> So it's really the unmanaged switch case, which I though I motivated well in
> the patch description here (PHY library, ethtool and switch WoL management).

If its an unmanaged switch, you don't need DSA, or anything at all
other than MACB. Linux is just a plain host connected to a switch. It
is a little unusual that the switch is integrated into the same box,
rather than being a patch cable away, bit linux does not really see
this difference compared to any other unmanaged switch.

	Andrew