linux-kernel - Re: [PATCH net v5 1/6] net: dsa: mt7530: set all CPU ports in MT7531_CPU

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Message-ID: <20230616100130.f7mjociopsgd6pe4@skbuf>
Date:   Fri, 16 Jun 2023 13:01:30 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     arinc9.unal@...il.com
Cc:     Arınç ÜNAL <arinc.unal@...nc9.com>,
        Daniel Golle <daniel@...rotopia.org>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        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>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
        mithat.guner@...ont.com, erkin.bozoglu@...ont.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net v5 1/6] net: dsa: mt7530: set all CPU ports in
 MT7531_CPU_PMAP

On Fri, Jun 16, 2023 at 05:53:22AM +0300, arinc9.unal@...il.com wrote:
> From: Arınç ÜNAL <arinc.unal@...nc9.com>
> 
> MT7531_CPU_PMAP represents the destination port mask for trapped-to-CPU
> frames (further restricted by PCR_MATRIX).
> 
> Currently the driver sets the first CPU port as the single port in this bit
> mask, which works fine regardless of whether the device tree defines port
> 5, 6 or 5+6 as CPU ports. This is because the logic coincides with DSA's
> logic of picking the first CPU port as the CPU port that all user ports are
> affine to, by default.
> 
> An upcoming change would like to influence DSA's selection of the default
> CPU port to no longer be the first one, and in that case, this logic needs
> adaptation.
> 
> Since there is no observed leakage or duplication of frames if all CPU
> ports are defined in this bit mask, simply include them all.
> 
> Suggested-by: Russell King (Oracle) <linux@...linux.org.uk>
> Suggested-by: Vladimir Oltean <olteanv@...il.com>
> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> ---

Reviewed-by: Vladimir Oltean <olteanv@...il.com>