linux-kernel - Re: [PATCH net-next 2/2] net: dsa: mv88e6xxx: enable support for 88E6361 switch

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Message-ID: <20230519153233.3fb8a4d1@thinkpad>
Date:   Fri, 19 May 2023 15:32:33 +0200
From:   Marek Behún <kabel@...nel.org>
To:     Alexis Lothoré <alexis.lothore@...tlin.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com,
        paul.arola@...us.com, scott.roberts@...us.com
Subject: Re: [PATCH net-next 2/2] net: dsa: mv88e6xxx: enable support for
 88E6361 switch

On Fri, 19 May 2023 15:16:57 +0200
Alexis Lothoré <alexis.lothore@...tlin.com> wrote:

> On 5/19/23 14:38, Marek Behún wrote:
> > On Thu, 18 May 2023 14:58:00 +0200
> > Andrew Lunn <andrew@...n.ch> wrote:
> >   
> >>>>> +	[MV88E6361] = {
> >>>>> +		.prod_num = MV88E6XXX_PORT_SWITCH_ID_PROD_6361,
> >>>>> +		.family = MV88E6XXX_FAMILY_6393,
> >>>>> +		.name = "Marvell 88E6361",
> >>>>> +		.num_databases = 4096,
> >>>>> +		.num_macs = 16384,
> >>>>> +		.num_ports = 11,
> >>>>> +		/* Ports 1, 2 and 8 are not routed */
> >>>>> +		.invalid_port_mask = BIT(1) | BIT(2) | BIT(8),
> >>>>> +		.num_internal_phys = 5,    
> >>>>
> >>>> Which ports have internal PHYs? 2, 3, 4, 5, 6, 7 ?  What does
> >>>> mv88e6xxx_phy_is_internal() return for these ports, and
> >>>> mv88e6xxx_get_capsmv88e6xxx_get_caps()? I'm wondering if you actually
> >>>> need to list 8 here?    
> >>>
> >>> Indeed there is something wrong here too. I need to tune
> >>> mv88e6393x_phylink_get_caps to reflect 88E6361 differences.
> >>>
> >>> As stated above, port 3 to 7 are the ones with internal PHY.
> >>> For mv88e6xxx_phy_is_internal, I see that it is merely comparing the port index
> >>> to the number of internal phys, so in this case it would advertise (wrongly)
> >>> that ports 0 to 4 have internal phys.    
> >>
> >> Ports 1 and 2 should hopefully be protected by the
> >> invalid_port_mask. It should not even be possible to create those
> >> ports. port 0 is interesting, and possibly currently broken on
> >> 6393. Please take a look at that.  
> > 
> > Why would port 0 be broken on 6393x ?  
> By "broken", I guess Andrew means that if we feed port 0 to
> mv88e6xxx_phy_is_internal, it will return true, which is wrong since there is no
> internal phy for port 0 on 6393X ?

OK that's true :)