linux-kernel - Re: [PATCH net-next 27/30] net: dsa: mt7530: introduce BPDU trapping for MT7530 switch

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Message-ID: <cc21196b-a18a-ce3c-e3f3-4303abf4b9a3@arinc9.com>
Date:   Sun, 4 Jun 2023 12:39:33 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Daniel Golle <daniel@...rotopia.org>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Russell King <linux@...linux.org.uk>,
        Richard van Schagen <richard@...terhints.com>,
        Richard van Schagen <vschagen@...com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
        erkin.bozoglu@...ont.com, mithat.guner@...ont.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next 27/30] net: dsa: mt7530: introduce BPDU trapping
 for MT7530 switch

On 4.06.2023 12:23, Vladimir Oltean wrote:
> On Sun, Jun 04, 2023 at 11:51:33AM +0300, Arınç ÜNAL wrote:
>>> If the switch doesn't currently trap BPDUs, isn't STP broken?
>>
>> No, the BPDU_PORT_FW bits are 0 after reset. The MT7620 programming guide
>> states that frames with 01:80:C2:00:00:00 MAC DA (which is how the BPDU
>> distinction is being made) will follow the system default which means the
>> BPDUs will be treated as normal multicast frames.
>>
>> Only if all 3 bits are set will the BPDUs be dropped.
> 
> Right, if you don't trap BPDUs just to the CPU but flood them, I believe
> the STP protocol won't behave properly with switching loops. Worth testing.

I've got no interest spending time playing around with STP at the moment 
so I'm going to pass.

Arınç