linux-kernel - Re: [PATCH net-next v2 4/4] net: dsa: mt7530: always install FDB entries with IVL and FID 1

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Date:   Tue, 3 Aug 2021 19:51:38 +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,
        Eric Woudstra <ericwouds@...il.com>,
        René van Dorst <opensource@...rst.com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
Subject: Re: [PATCH net-next v2 4/4] net: dsa: mt7530: always install FDB
 entries with IVL and FID 1

On Wed, Aug 04, 2021 at 12:04:04AM +0800, DENG Qingfang wrote:
> This reverts commit 7e777021780e ("mt7530 mt7530_fdb_write only set ivl
> bit vid larger than 1").
> 
> Before this series, the default value of all ports' PVID is 1, which is
> copied into the FDB entry, even if the ports are VLAN unaware. So
> `bridge fdb show` will show entries like `dev swp0 vlan 1 self` even on
> a VLAN-unaware bridge.
> 
> The blamed commit does not solve that issue completely, instead it may
> cause a new issue that FDB is inaccessible in a VLAN-aware bridge with
> PVID 1.
> 
> This series sets PVID to 0 on VLAN-unaware ports, so `bridge fdb show`
> will no longer print `vlan 1` on VLAN-unaware bridges, and that special
> case in fdb_write is not required anymore.
> 
> Set FDB entries' filter ID to 1 to match the VLAN table.
> 
> Signed-off-by: DENG Qingfang <dqfext@...il.com>
> ---

The way FDB entries are installed now makes a lot more intuitive sense.