linux-kernel - Re: [RFC net-next 1/2] net: dsa: tag_mtk: skip address learning on transmit to standalone ports

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Message-Id: <20210730173203.518307-1-dqfext@gmail.com>
Date:   Sat, 31 Jul 2021 01:32:03 +0800
From:   DENG Qingfang <dqfext@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC net-next 1/2] net: dsa: tag_mtk: skip address learning on transmit to standalone ports

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?

You're right. Hardware learning on CPU port does have some limitations.

I have been testing a multi CPU ports patch, and assisted learning has
to be used, because FDB entries should be installed like multicast
ones, which point to all CPU ports.