linux-kernel - Re: [RFC net-next v2 3/4] net: dsa: mt7530: set STP state also on filter ID 1

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Message-Id: <20210802155810.1818085-1-dqfext@gmail.com>
Date:   Mon,  2 Aug 2021 23:58:10 +0800
From:   DENG Qingfang <dqfext@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Eric Woudstra <ericwouds@...il.com>,
        René van Dorst <opensource@...rst.com>,
        Frank Wunderlich <frank-w@...lic-files.de>
Subject: Re: [RFC net-next v2 3/4] net: dsa: mt7530: set STP state also on filter ID 1

On Mon, Aug 02, 2021 at 06:42:26PM +0300, Vladimir Oltean wrote:
> On Mon, Aug 02, 2021 at 11:31:29PM +0800, DENG Qingfang wrote:
> > The current code only sets FID 0's STP state. This patch sets both 0's and
> > 1's states.
> >
> > The *5 part is binary magic. [1:0] is FID 0's state, [3:2] is FID 1's state
> > and so on. Since 5 == 4'b0101, the value in [1:0] is copied to [3:2] after
> > the multiplication.
> >
> > Perhaps I should only change FID 1's state.
> 
> Keep the patches dumb for us mortals please.
> If you only change FID 1's state, I am concerned that the driver no
> longer initializes FID 0's port state, and might leave that to the
> default set by other pre-kernel initialization stage (bootloader?).
> So even if you might assume that standalone ports are FORWARDING, they
> might not be.

The default value is forwarding, and the switch is reset by the driver
so any pre-kernel initialization stage is no more.