netdev - Re: [PATCH net-next 5/5] net: dsa: mv88e6xxx: implementation of dynamic ATU entries

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Date:   Fri, 3 Feb 2023 09:20:22 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     netdev@...io-technology.com
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <olteanv@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        "maintainer:MICROCHIP KSZ SERIES ETHERNET SWITCH DRIVER" 
        <UNGLinuxDriver@...rochip.com>, Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Clément Léger <clement.leger@...tlin.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Russell King <linux@...linux.org.uk>,
        Christian Marangi <ansuelsmth@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        "open list:RENESAS RZ/N1 A5PSW SWITCH DRIVER" 
        <linux-renesas-soc@...r.kernel.org>,
        "moderated list:ETHERNET BRIDGE" <bridge@...ts.linux-foundation.org>
Subject: Re: [PATCH net-next 5/5] net: dsa: mv88e6xxx: implementation of
 dynamic ATU entries

On Thu, Feb 02, 2023 at 06:00:00PM +0100, netdev@...io-technology.com wrote:
> On 2023-01-31 19:56, Simon Horman wrote:
> > > --- a/drivers/net/dsa/mv88e6xxx/chip.c
> > > +++ b/drivers/net/dsa/mv88e6xxx/chip.c
> > > @@ -42,6 +42,7 @@
> > >  #include "ptp.h"
> > >  #include "serdes.h"
> > >  #include "smi.h"
> > > +#include "switchdev.h"
> > > 
> > >  static void assert_reg_lock(struct mv88e6xxx_chip *chip)
> > >  {
> > > @@ -2726,18 +2727,25 @@ static int mv88e6xxx_port_fdb_add(struct
> > > dsa_switch *ds, int port,
> > >  				  const unsigned char *addr, u16 vid,
> > >  				  u16 fdb_flags, struct dsa_db db)
> > >  {
> > > +	bool is_dynamic = !!(fdb_flags & DSA_FDB_FLAG_DYNAMIC);
> > >  	struct mv88e6xxx_chip *chip = ds->priv;
> > > +	u8 state;
> > >  	int err;
> > > 
> > > -	/* Ignore entries with flags set */
> > > -	if (fdb_flags)
> > > -		return 0;
> > > +	state = MV88E6XXX_G1_ATU_DATA_STATE_UC_STATIC;
> > > +	if (is_dynamic)
> > > +		state = MV88E6XXX_G1_ATU_DATA_STATE_UC_AGE_7_NEWEST;
> > 
> > What if flags other than DSA_FDB_FLAG_DYNAMIC are set (in future)?
> 
> They will have to be caught and handled here if there is support for it,
> e.g. something like...
> 
> else if (someflag)
>         dosomething();
> 
> For now only one flag will actually be set and they are mutually exclusive,
> as they will not make sense together with the potential flags I know, but
> that can change at some time of course.

Yes, I see that is workable. I do feel that checking for other flags would
be a bit more robust. But as you say, there are none. So whichever
approach you prefer is fine by me.

> > 
> > > +	else
> > > +		if (fdb_flags)
> > 
> > nit: else if (fdb_flags)
> > 
> > > +			return 0;
> > > 
> > 
> > ...