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Date:   Fri, 30 Jul 2021 22:07:06 +0300
From:   Vladimir Oltean <olteanv@gmail.com>
To:     DENG Qingfang <dqfext@gmail.com>
Cc:     Sean Wang <sean.wang@mediatek.com>,
        Landen Chao <Landen.Chao@mediatek.com>,
        Andrew Lunn <andrew@lunn.ch>,
        Vivien Didelot <vivien.didelot@gmail.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC net-next 1/2] net: dsa: tag_mtk: skip address learning on
 transmit to standalone ports
Message-ID: <20210730190706.jm7uizyqltmle2bi@skbuf>
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On Sat, Jul 31, 2021 at 03:00:20AM +0800, DENG Qingfang wrote:
> On Fri, Jul 30, 2021 at 07:24:03PM +0300, Vladimir Oltean wrote:
> > Considering that you also have the option of setting
> > ds->assisted_learning_on_cpu_port = true and this will have less false
> > positives, what are the reasons why you did not choose that approach?
> 
> After enabling it, I noticed .port_fdb_{add,del} are called with VID=0
> (which it does not use now) unless I turn on VLAN filtering. Is that
> normal?

They are called with the VID from the learned packet.
If the bridge is VLAN-unaware, the MAC SA is learned with VID 0.
Generally, VID 0 is always used for VLAN-unaware bridging. You can
privately translate VID 0 to whatever VLAN ID you use in VLAN-unaware
mode.