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

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Date:   Sat, 31 Jul 2021 01:58:16 +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 08:41:35PM +0300, Vladimir Oltean wrote:
> On Fri, Jul 30, 2021 at 08:39:02PM +0300, Vladimir Oltean wrote:
> > 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?

MT7530 only supports static assignment, by changing the port matrix.

MT7531 also supports hardware LAG, but I don't think it's ideal because
its CPU ports have different speeds (one 1Gbps RGMII and the other 2.5Gbps
HSGMII).