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: <20230616102520.4uvuhywkcpk5ljtk@skbuf>
Date:   Fri, 16 Jun 2023 13:25:20 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
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 11:17:54AM +0100, Russell King (Oracle) wrote:
> 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().
> 
> -- 
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

Ah, no, I just misread the patch, because the new term was added to the
left of the existing one, and not to the right as I would have expected.
I though it was this:

> > > -	if (priv->id == ID_MT7530)
> > > +	if (priv->id == ID_MT7530 || priv->id == ID_MT7621)

thus my confusion and my question.

I'm okay with the change now.