linux-kernel - Re: [PATCH net-next 08/30] net: dsa: mt7530: change p{5,6}_interface to p{5,6}

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Message-ID: <20230610175553.hle2josd5s5jfhjo@skbuf>
Date:   Sat, 10 Jun 2023 20:55:53 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Arınç ÜNAL <arinc.unal@...nc9.com>
Cc:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Daniel Golle <daniel@...rotopia.org>,
        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>,
        Richard van Schagen <richard@...terhints.com>,
        Richard van Schagen <vschagen@...com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
        erkin.bozoglu@...ont.com, mithat.guner@...ont.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next 08/30] net: dsa: mt7530: change p{5,6}_interface
 to p{5,6}_configured

On Sat, Jun 10, 2023 at 01:57:27PM +0300, Arınç ÜNAL wrote:
> I was able to confirm all user ports of the MT7531BE switch transmit/receive
> traffic to/from the SGMII CPU port and computer fine after getting rid of
> priv->info->cpu_port_config().
> 
> Tried all user ports being affine to the RGMII CPU port, that works too.
> 
> https://github.com/arinc9/linux/commit/4e79313a95d45950cab526456ef0030286ba4d4e

Did you do black-box testing after removing the code, or were you
also able to independently confirm that the configurations done by
cpu_port_config() were later overwritten? I'm trying to disambiguate
between "works by coincidence" and "works because the analysis was
correct".