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

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Date:   Mon,  2 Aug 2021 23:31:29 +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 04:43:36PM +0300, Vladimir Oltean wrote:
> On Sun, Aug 01, 2021 at 03:10:21AM +0800, DENG Qingfang wrote:
> > --- a/drivers/net/dsa/mt7530.h
> > +++ b/drivers/net/dsa/mt7530.h
> > @@ -181,7 +181,7 @@ enum mt7530_vlan_egress_attr {
> >  
> >  /* Register for port STP state control */
> >  #define MT7530_SSP_P(x)			(0x2000 + ((x) * 0x100))
> > -#define  FID_PST(x)			((x) & 0x3)
> 
> Shouldn't these macros have _two_ arguments, the FID and the port state?
> 
> > +#define  FID_PST(x)			(((x) & 0x3) * 0x5)
> 
> "* 5": explanation?
> 
> >  #define  FID_PST_MASK			FID_PST(0x3)
> >  
> >  enum mt7530_stp_state {
> > -- 
> > 2.25.1
> > 
> 
> I don't exactly understand how this patch works, sorry.
> Are you altering port state only on bridged ports, or also on standalone
> ports after this patch? Are standalone ports in the proper STP state
> (FORWARDING)?

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.