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

[Andrew Lunn]

On Fri, Jul 04, 2025 at 11:05:14AM +0200, Nikita Yushchenko wrote:
> > 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.

So in this case, the hardware offload has been reserved by br0, but is
in fact never used, since there is only one port in the bridge. If i
was to then do

ip link set dev tsn2 master br1
ip link set dev tsn2 up

br1 would not be offloaded, but done in software.

	Andrew