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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Florian Fainelli , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH RFC net-next 3/3] net: dsa: deny 8021q uppers on vlan unaware bridged ports Message-ID: <20251111115627.orks445s5o2adkbu@skbuf> References: <20251110214443.342103-1-jonas.gorski@gmail.com> <20251110214443.342103-4-jonas.gorski@gmail.com> <20251110222501.bghtbydtokuofwlr@skbuf> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Nov 11, 2025 at 11:06:48AM +0100, Jonas Gorski wrote: > But I noticed while testing that apparently b53 in filtering=0 mode > does not forward any tagged traffic (and I think I know why ...). > > Is there a way to ask for a replay of the fdb (static) entries? To fix > this for older switches, we need to disable 802.1q mode, but this also > switches the ARL from IVL to SVL, which changes the hashing, and would > break any existing entries. So we need to flush the ARL before > toggling 802.1q mode, and then reprogram any static entries. I'm not clear on what happens. "Broken" FDB entries in the incorrect bridge vlan_filtering mode sounds like normal behaviour (FDB entries with VID=0 while vlan_filtering=1, or FDB entries with VID!=0 while vlan_filtering=0). They should just sit idle in the ARL until the VLAN filtering mode makes them active.