Re: [PATCH net] net: renesas: rswitch: fix forwarding offload statemachine

[Nikita Yushchenko]

WBR,
Nikita Yushchenko,
System Software Engineer @ Cogent Embedded

05.02.2026 15:41, Nikita Yushchenko wrote:
> > > 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.
>
> "Offloading" means - forward a frame from one hw port to other hw port without inserting it into CPU 
> queue. Offloaded frame is never visible to software bridge.
>
> There is code that allows offload only if the linux bridge device used to connect rswitch ports does not 
> have anything else.  If it has something else, offloading is disabled (because there is no way to know 
> when a frame can be processed within rswitch hw without sending it to cpu).

A frame being received by bridge device itself is not a subject for offload, ever.