linux-kernel - Re: [PATCH net v2 2/7] net: dsa: mt7530: fix trapping frames with multiple CPU ports on MT7530

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Message-ID: <edcbe326-c456-06ef-373b-313e780209de@arinc9.com>
Date:   Tue, 13 Jun 2023 20:58:33 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     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 v2 2/7] net: dsa: mt7530: fix trapping frames with
 multiple CPU ports on MT7530

On 13.06.2023 20:39, Vladimir Oltean wrote:
> On Tue, Jun 13, 2023 at 08:30:28PM +0300, Arınç ÜNAL wrote:
>> That fixes port 5 on certain variants of the MT7530 switch, as it was
>> already working on the other variants, which, in conclusion, fixes port 5 on
>> all MT7530 variants.
> 
> Ok. I didn't pay enough attention to the commit message.
> 
>> And no, trapping works. Having only CPU port 5 defined on the devicetree
>> will cause the CPU_PORT bits to be set to port 5. There's only a problem
>> when multiple CPU ports are defined.
> 
> Got it. Then this is really not a problem, and the commit message frames
> it incorrectly.

Actually this patch fixes the issue it describes. At the state of this 
patch, when multiple CPU ports are defined, port 5 is the active CPU 
port, CPU_PORT bits are set to port 6.

Once "the patch that prefers port 6, I could easily find the exact name 
but your mail snipping makes it hard" is applied, this issue becomes 
redundant.

> 
>>> So how about settling on that as a more modest Fixes: tag, and
>>> explaining clearly in the commit message what's affected?
>>
>> I don't see anything to change in the patch log except addressing Russell's
>> comments.
> 
> Ok. I see Russell has commented on v4, though I don't see that he particularly
> pointed out that this fixes a problem which isn't yet a problem. I got lost in
> all the versions. v2 and v3 are out of my inbox now :)

All good, I had to quickly roll v3 as v2 had wrong author information 
and I couldn't risk getting v2 applied.

Arınç