netdev - Re: [RFC v8 net-next 15/16] net: dsa: felix: add phylink_get

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Date:   Mon, 9 May 2022 17:23:32 -0700
From:   Colin Foster <colin.foster@...advantage.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Terry Bowman <terry.bowman@....com>,
        Wolfram Sang <wsa@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [RFC v8 net-next 15/16] net: dsa: felix: add phylink_get_caps
 capability

On Mon, May 09, 2022 at 10:34:45AM +0000, Vladimir Oltean wrote:
> On Sun, May 08, 2022 at 11:53:12AM -0700, Colin Foster wrote:
> > Add the ability for felix users to announce their capabilities to DSA
> > switches by way of phylink_get_caps. This will allow those users the
> > ability to use phylink_generic_validate, which otherwise wouldn't be
> > possible.
> > 
> > Signed-off-by: Colin Foster <colin.foster@...advantage.com>
> > ---
> >  drivers/net/dsa/ocelot/felix.c | 22 +++++++++++++++-------
> >  drivers/net/dsa/ocelot/felix.h |  2 ++
> >  2 files changed, 17 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
> > index d09408baaab7..32ed093f47c6 100644
> > --- a/drivers/net/dsa/ocelot/felix.c
> > +++ b/drivers/net/dsa/ocelot/felix.c
> > @@ -982,15 +982,23 @@ static void felix_phylink_get_caps(struct dsa_switch *ds, int port,
> >  				   struct phylink_config *config)
> >  {
> >  	struct ocelot *ocelot = ds->priv;
> > +	struct felix *felix;
> >  
> > -	/* This driver does not make use of the speed, duplex, pause or the
> > -	 * advertisement in its mac_config, so it is safe to mark this driver
> > -	 * as non-legacy.
> > -	 */
> > -	config->legacy_pre_march2020 = false;
> > +	felix = ocelot_to_felix(ocelot);
> > +
> > +	if (felix->info->phylink_get_caps) {
> > +		felix->info->phylink_get_caps(ocelot, port, config);
> > +	} else {
> >  
> > -	__set_bit(ocelot->ports[port]->phy_mode,
> > -		  config->supported_interfaces);
> > +		/* This driver does not make use of the speed, duplex, pause or
> > +		 * the advertisement in its mac_config, so it is safe to mark
> > +		 * this driver as non-legacy.
> > +		 */
> > +		config->legacy_pre_march2020 = false;
> 
> I don't think you mean to set legacy_pre_march2020 to true only
> felix->info->phylink_get_caps is absent, do you?
> 
> Also, I'm thinking maybe we could provide an implementation of this
> function for all switches, not just for vsc7512.

I had assumed these last two patches might spark more discussion, which
is why I kept them separate (specifically the last patch).

With this, are you simply suggesting to take everything that is
currently in felix_phylink_get_caps and doing it in the felix / seville
implementations? This is because the default condition is no longer the
"only" condition. Sounds easy enough.

> 
> > +
> > +		__set_bit(ocelot->ports[port]->phy_mode,
> > +			  config->supported_interfaces);
> > +	}
> >  }
> >  
> >  static void felix_phylink_validate(struct dsa_switch *ds, int port,
> > diff --git a/drivers/net/dsa/ocelot/felix.h b/drivers/net/dsa/ocelot/felix.h
> > index 3ecac79bbf09..33281370f415 100644
> > --- a/drivers/net/dsa/ocelot/felix.h
> > +++ b/drivers/net/dsa/ocelot/felix.h
> > @@ -57,6 +57,8 @@ struct felix_info {
> >  					u32 speed);
> >  	struct regmap *(*init_regmap)(struct ocelot *ocelot,
> >  				      struct resource *res);
> > +	void	(*phylink_get_caps)(struct ocelot *ocelot, int port,
> > +				    struct phylink_config *pl_config);
> >  };
> >  
> >  extern const struct dsa_switch_ops felix_switch_ops;
> > -- 
> > 2.25.1
> >