netdev - Re: [RFC net-next 2/2] net: dsa: mt7530: trap packets from standalone ports to the CPU

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Message-Id: <20210730175139.518992-1-dqfext@gmail.com>
Date:   Sat, 31 Jul 2021 01:51:39 +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 <netdev@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC net-next 2/2] net: dsa: mt7530: trap packets from standalone ports to the CPU

On Fri, Jul 30, 2021 at 08:35:11PM +0300, Vladimir Oltean wrote:
> On Sat, Jul 31, 2021 at 01:21:14AM +0800, DENG Qingfang wrote:
> > I just found a cleaner solution: Leaving standalone ports in port matrix
> > mode. As all bridges use independent VLAN learning, standalone ports'
> > FDB lookup with FID 0 won't hit.
> 
> So standalone ports are completely VLAN-unaware and always use a FID of
> 0, ports under a VLAN-unaware bridge are in fallback mode (look up the
> VLAN table but don't drop on miss), use a FID of 1-7, and ports under a
> VLAN-aware bridge are in the security mode and use the CVID instead of
> the FID for VLAN classification?

No. Both VLAN-unaware and VLAN-aware bridges use independent VLAN learning
i.e. use CVID for FDB lookup.

> 
> Make sure to test a mix of standalone, VLAN-unaware bridge and
> VLAN-aware bridge with the same MAC address in all 3 domains. If that
> works well this should be really good.