linux-kernel - Re: [PATCH net-next 06/12] net: dsa: rzn1-a5psw: add Renesas RZ/N1 advanced 5 port switch driver

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Date:   Fri, 15 Apr 2022 10:40:29 +0200
From:   Clément Léger <clement.leger@...tlin.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Herve Codina <herve.codina@...tlin.com>,
        Miquèl Raynal <miquel.raynal@...tlin.com>,
        Milan Stevanovic <milan.stevanovic@...com>,
        Jimmy Lalande <jimmy.lalande@...com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, netdev@...r.kernel.org,
        Laurent Gonzales <laurent.gonzales@....se.com>,
        Jean-Pierre Geslin <jean-pierre.geslin@....se.com>,
        Phil Edworthy <phil.edworthy@...esas.com>
Subject: Re: [PATCH net-next 06/12] net: dsa: rzn1-a5psw: add Renesas RZ/N1
 advanced 5 port switch driver

Le Thu, 14 Apr 2022 14:02:10 +0100,
"Russell King (Oracle)" <linux@...linux.org.uk> a écrit :

> On Thu, Apr 14, 2022 at 02:22:44PM +0200, Clément Léger wrote:
> > Add Renesas RZ/N1 advanced 5 port switch driver. This switch handles 5
> > ports including 1 CPU management port. A MDIO bus is also exposed by
> > this switch and allows to communicate with PHYs connected to the ports.
> > Each switch port (except for the CPU management ports) are connected to
> > the MII converter.
> > 
> > This driver include basic bridging support, more support will be added
> > later (vlan, etc).  
> 
> This patch looks to me like it needs to be updated...

Hi Russell,

When you say so, do you expect the VLAN support to be included ?

> 
> > +static void a5psw_phylink_validate(struct dsa_switch *ds, int port,
> > +				   unsigned long *supported,
> > +				   struct phylink_link_state *state)
> > +{
> > +	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0 };
> > +
> > +	phylink_set_port_modes(mask);
> > +
> > +	phylink_set(mask, Autoneg);
> > +	phylink_set(mask, Pause);
> > +	phylink_set(mask, Asym_Pause);
> > +
> > +	phylink_set(mask, 1000baseT_Full);
> > +	if (!dsa_is_cpu_port(ds, port)) {
> > +		phylink_set(mask, 10baseT_Half);
> > +		phylink_set(mask, 10baseT_Full);
> > +		phylink_set(mask, 100baseT_Half);
> > +		phylink_set(mask, 100baseT_Full);
> > +	}  
> 
> If the port supports e.g. RGMII (as it does via the media converter)
> then it also supports 1000baseX modes as well - because a PHY attached
> to the RGMII port can convert to 1000baseX.
> 
> > +
> > +	linkmode_and(supported, supported, mask);
> > +	linkmode_and(state->advertising, state->advertising, mask);
> > +}  
> 
> This basically means "I support every phy_interface_t mode that has ever
> been implemented" which surely is not what you want. I doubt from the
> above that you support 10GBASE-KR for example.

Hmmm yes indeed, that's not what I meant *at all*.

> 
> Please instead implement the .phylink_get_caps DSA switch interface, and
> fill in the config->supported_interfaces for all interface modes that
> the port supports (that including the media converter as well) and the
> config->mac_capabilities members.
> 

Ok, looks indeed more fitted and easier to understand.

-- 
Clément Léger,
Embedded Linux and Kernel engineer at Bootlin
https://bootlin.com