linux-kernel - RE: [PATCH net] net: renesas: rswitch: fix forwarding offload statemachine

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Message-ID:
 <TY4PR01MB142829EB0EDDE13B588F949298299A@TY4PR01MB14282.jpnprd01.prod.outlook.com>
Date: Thu, 5 Feb 2026 14:35:27 +0000
From: Michael Dege <michael.dege@...esas.com>
To: Nikita Yushchenko <nikita.yoush@...entembedded.com>, Yoshihiro Shimoda
	<yoshihiro.shimoda.uh@...esas.com>, 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>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH net] net: renesas: rswitch: fix forwarding offload
 statemachine

Hello Nikita,


> -----Original Message-----
> From: Nikita Yushchenko <nikita.yoush@...entembedded.com>
> Sent: Thursday, February 5, 2026 2:57 PM
> To: Michael Dege <michael.dege@...esas.com>; Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>;
> 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>
> Cc: netdev@...r.kernel.org; linux-renesas-soc@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH net] net: renesas: rswitch: fix forwarding offload statemachine
> 
> >> Quite strange, is anything else logged?  E.g. some messages from linux bridge layer?
> >>
> >> Nikita
> >
> > Here is the log from the version without "if else"
> >
> > [   83.107759] renesas_eth_sw e6880000.ethernet tsn0: Link is Down
> > [   83.108734] br0: port 1(tsn0) entered disabled state
> > [   83.109669] renesas_eth_sw e6880000.ethernet tsn0: stopping hw learning
> > [   83.110519] renesas_eth_sw e6880000.ethernet tsn0: stopping hw forwarding
> > [   83.111405] renesas_eth_sw e6880000.ethernet tsn1: stopping hw forwarding
> 
> The driver was originally designed to enable hardware forwarding when not less than two ports are in
> forwarding state. When only one port has hw forwarding, there is no destination to forward.
> 
> Nikita
> 

The current driver allows Linux to use the bridge port as local port to the bridge. The offloading 
Also supports switching traffic to Linux through the bridge port. Therefore, the offloading shouldn't 
Be dropped if only one external port is up on the bridge.

Best regards,

Michael