linux-kernel - Re: [PATCH 0/3] net: renesas: rswitch: R-Car S4 add HW offloading for layer 2 switching

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Message-ID: <9c8cb213-7daf-43bb-8d20-aaefa13127af@lunn.ch>
Date: Fri, 4 Jul 2025 10:33:59 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Michael Dege <michael.dege@...esas.com>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Niklas Söderlund <niklas.soderlund@...natech.se>,
	Paul Barker <paul@...rker.dev>, Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Nikita Yushchenko <nikita.yoush@...entembedded.com>
Subject: Re: [PATCH 0/3] net: renesas: rswitch: R-Car S4 add HW offloading
 for layer 2 switching

On Fri, Jul 04, 2025 at 07:51:14AM +0200, Michael Dege wrote:
> Hello!
> 
> The current R-Car S4 rswitch driver only supports port based fowarding.
> This patch set adds HW offloading for L2 switching/bridgeing. The driver
> hooks into switchdev.
> 
> 1. Rename the base driver file to keep the driver name (rswitch.ko)
> 
> 2. Add the L2 driver extension in a separate file. The HW offloading
> is automatically configured when a port is added to the bridge device.
> 
> Ussage example:
> ip link add name br type bridge
> ip link set dev tsn0 master br
> ip link set dev tsn1 master br
> ip link set dev br up
> ip link set dev tsn0 up
> ip link set dev tsn1 up

It is not wrong, but it is normal for an interface to have a number of
some sort. So br0.

> 
> Layer 2 traffic is now fowarded by HW from port TSN0 to port TSN1.
> 
> 3. Provides the functionality to set the MAC table ageing time in the
> Rswitch.
> 
> Usage example:
> brctl setageing br 300

brctl is deprecated. iproute2 has a method to do this, which would be
a better reference to give.

  Andrew