linux-kernel - Re: [PATCH net v5 2/6] net: dsa: mt7530: fix trapping frames on non-MT7621 SoC MT7530 switch

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Message-ID: <ZIw20jmqI1d/W+YY@shell.armlinux.org.uk>
Date:   Fri, 16 Jun 2023 11:17:54 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     arinc9.unal@...il.com,
        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>,
        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 2/6] net: dsa: mt7530: fix trapping frames on
 non-MT7621 SoC MT7530 switch

On Fri, Jun 16, 2023 at 01:03:14PM +0300, Vladimir Oltean wrote:
> On Fri, Jun 16, 2023 at 05:53:23AM +0300, arinc9.unal@...il.com wrote:
> > From: Arınç ÜNAL <arinc.unal@...nc9.com>
> > 
> > The check for setting the CPU_PORT bits must include the non-MT7621 SoC
> > MT7530 switch variants to trap frames. Expand the check to include them.
> > 
> > Fixes: b8f126a8d543 ("net-next: dsa: add dsa support for Mediatek MT7530 switch")
> > Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> > ---
> 
> why do you say non-MT7621 when the change specifically includes MT7621?
> What is the affected SoC then?

Thanks for falling into one of the issues that makes reviewing these
patches difficult. :/

> > -	if (priv->id == ID_MT7621)
> > +	if (priv->id == ID_MT7530 || priv->id == ID_MT7621)
> >  		mt7530_rmw(priv, MT7530_MFC, CPU_MASK, CPU_EN | CPU_PORT(port));

I *think* what the commit message should be saying is that the setup
for the CPU port(*) is necessary not only for MT7621, but also for
MT7530 variants as well.

That can be construed from the commit message, but it doesn't easily
read that way.

* - in this case, it's the CPU port field and the CPU enable bit.
Note that CPU_MASK only covers CPU_PORT() and not CPU_EN, but this
doesn't matter for mt7530_rmw().

-- 
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