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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Woojung Huh , Russell King , Steen Hegelund , Daniel Machon , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org Subject: Re: [PATCH net-next 5/8] net: dsa: lan9645x: add bridge support Message-ID: <20260303161751.s4ryquinp2fus37g@skbuf> References: <20260303-dsa_lan9645x_switch_driver_base-v1-0-bff8ca1396f5@microchip.com> <20260303-dsa_lan9645x_switch_driver_base-v1-0-bff8ca1396f5@microchip.com> <20260303-dsa_lan9645x_switch_driver_base-v1-5-bff8ca1396f5@microchip.com> <20260303-dsa_lan9645x_switch_driver_base-v1-5-bff8ca1396f5@microchip.com> <20260303142048.y4vu5i57daeuezxm@skbuf> <930c6381b676f6c911e3c7235be5b08c7ca24e09.camel@microchip.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <930c6381b676f6c911e3c7235be5b08c7ca24e09.camel@microchip.com> On Tue, Mar 03, 2026 at 05:08:10PM +0100, Jens Emil Schulz Ostergaard wrote: > On Tue, 2026-03-03 at 16:20 +0200, Vladimir Oltean wrote: > > > > On Tue, Mar 03, 2026 at 01:22:31PM +0100, Jens Emil Schulz Østergaard wrote: > > > We support a single bridge device. > > > > Why? I keep seeing this from Microchip engineers. Having two > > VLAN-unaware bridges on different sets of ports is a perfectly valid use > > case. On Ocelot I took the driver from a state where it had an identical > > implementation to yours and I made it handle multiple bridges. I don't > > see where's the problem. > > The main reason is that is what we support in other drivers such as sparx5, > lan969x and lan966x. I saw your solution for Ocelot, but I could not think > of the use case, where you would not just use vlans on a single bridge to > isolate forwarding domains. But I may be missing something. I already said the use case, VLAN-unaware bridging, where it transports VLAN-tagged packets from one port to another without filtering based on the VLAN tag. You can't replicate that with a bridge with vlan_filtering=1, because it would then stumble over VLAN-tagged packets which you'd need to add to the VLAN table, otherwise they'd be dropped. And then you couldn't have the same VLANs being transported in bridge A as the VLANs that are transported by bridge B, because you would allow inter-bridge forwarding. It's just not the same thing. > The same solution would work here, but the bridges can not be vlan-aware. Yeah, hardware limitation, there it makes sense to have a restriction in place.