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

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Date:   Fri, 30 Jul 2021 20:41:35 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     DENG Qingfang <dqfext@...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 08:39:02PM +0300, Vladimir Oltean wrote:
> On Sat, Jul 31, 2021 at 01:32:03AM +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?
> > 
> > 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.
> 
> Ah, mt7530 is one of the switches which has multiple CPU ports, I had
> forgotten that. In that case, then static FDB entries are pretty much
> the only way to go indeed.

I forget which ones are the modes in which the multi-CPU feature on
mt7530 is supposed to be used: static assignment of user ports to CPU
ports, or LAG between the CPU ports, or a mix of both?