netdev - Re: [PATCH net] net: dsa: mt7530: don't change PVC_EG

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Date:   Sun, 5 Feb 2023 22:39:06 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Arınç ÜNAL <arinc.unal@...nc9.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Frank Wunderlich <frank-w@...lic-files.de>,
        erkin.bozoglu@...ont.com, richard@...terhints.com
Subject: Re: [PATCH net] net: dsa: mt7530: don't change PVC_EG_TAG when CPU
 port becomes VLAN-aware

Hi Arınç,

On Sun, Feb 05, 2023 at 10:25:27PM +0300, Arınç ÜNAL wrote:
> Unrelated to this, as in it existed before this patch, port@0 hasn't been
> working at all on my MT7621AT Unielec U7621-06 board and MT7623NI Bananapi
> BPI-R2.
> 
> Packets are sent out from master eth1 fine, the computer receives them.
> Frames are received on eth1 but nothing shows on the DSA slave interface of
> port@0. Sounds like malformed frames are received on eth1.

I need to ask, how do the packets look like on the RX path of the DSA
master, as seen by tcpdump -i eth1 -e -n -Q in -XX? If they aren't
received, can you post consecutive outputs from ethtool -S eth1 | grep -v ': 0',
to see what (error) counter increments?