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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Florian Fainelli , Jonas Gorski , netdev@vger.kernel.org, Hauke Mehrtens , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= Subject: Re: [PATCH V3 1/4 net] net: dsa: b53: deal with Northstar devices using CPU port 5 or 7 Message-ID: <20260813190813.63fjmjmciry6ubaf@skbuf> References: <20260812132755.32585-1-zajec5@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Thu, Aug 13, 2026 at 01:53:56PM +0300, Semih Baskan wrote: > With all three CPU ports enabled, GMNGCFG ends up in dual IMP mode > (0xc2 read back). In that mode a tagged frame whose VID is missing > from the VLAN table is delivered to no CPU port at all: an 8021q > upper on a standalone port receives 0 of 7 tagged probes, whether > the port 5 conduit is up or down. With port 8 as the only enabled > CPU port in the DT, where GMNGCFG reads 0b10, the same frames were > delivered. So the preferred CPU port alone does not revive > standalone 8021q uppers on DTs that enable all three ports. > > The same effect touches 4/4: the R8000 today has ports 5 and 7 > disabled, the single IMP configuration, and enabling them lands the > switch in dual IMP mode through the same driver path. If its switch > behaves like this BCM53011, standalone 8021q uppers on the R8000 > stop receiving with 4/4 applied. Where is the code that configures this GMNGCFG register? > On the RT-N18U the boot firmware provisions a MAC only for gmac0, > so gmac2 comes up with a random MAC and the bridge inherits it, > changing per boot. In the previous version, Rafał included a patch so that gmac2 uses the same MAC address as gmac0. Is this better? https://lore.kernel.org/netdev/20260811193658.14304-2-zajec5@gmail.com/