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: <79a57427-fd4a-4b9a-a081-cf09b649a20e@cogentembedded.com>
Date: Fri, 4 Jul 2025 11:05:14 +0200
From: Nikita Yushchenko <nikita.yoush@...entembedded.com>
To: Andrew Lunn <andrew@...n.ch>, 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
Subject: Re: [PATCH 0/3] net: renesas: rswitch: R-Car S4 add HW offloading for
 layer 2 switching

> Looking at the code, it is not clear to me what would happen with:
> 
> ip link add name br0 type bridge
> ip link set dev tsn0 master br0
> ip link set dev br0 up
> ip link set dev tsn0 up
> ip link add name br1 type bridge
> ip link set dev tsn1 master br1
> ip link set dev br1 up
> ip link set dev tsn1 up

Per design, it shall enable hardware forwarding when two ports are in the same brdev.