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

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Message-ID: <9a836863-c279-490f-a49a-de4db5de9fd4@lunn.ch>
Date:   Wed, 17 May 2023 22:51:17 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     alexis.lothore@...tlin.com
Cc:     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 Wed, May 17, 2023 at 10:34:30PM +0200, alexis.lothore@...tlin.com wrote:
> From: Alexis Lothoré <alexis.lothore@...tlin.com>
> 
> Marvell 88E6361 is an 8-port switch derived from the
> 88E6393X/88E9193X/88E6191X switches family. It can benefit from the
> existing mv88e6xxx driver by simply adding the proper switch description in
> the driver. Main differences with other switches from this
> family are:
> - 8 ports exposed (instead of 11): ports 1, 2 and 8 not available
> - No 5GBase-x nor SFI/USXGMII support

So what exactly is supported for link modes?

The way you reuse the 6393 ops, are these differences actually
enforced? It looks like mv88e6393x_phylink_get_caps() will allow
2500BaseX, 5GBaseX and 10GBaseR for port 10.

> +	[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?

     Andrew