netdev - Re: [PATCH] net: phy: marvell: fix detection of PHY on Topaz switches

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Date:   Mon, 12 Apr 2021 16:44:11 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Pali Rohár <pali@...nel.org>
Cc:     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>,
        Marek Behún <kabel@...nel.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: phy: marvell: fix detection of PHY on Topaz switches

On Mon, Apr 12, 2021 at 03:34:47PM +0200, Pali Rohár wrote:
> On Monday 12 April 2021 15:15:07 Andrew Lunn wrote:
> > > +static u16 mv88e6xxx_physid_for_family(enum mv88e6xxx_family family);
> > > +
> > 
> > No forward declaration please. Move the code around. It is often best
> > to do that in a patch which just moves code, no other changes. It
> > makes it easier to review.
> 
> Avoiding forward declaration would mean to move about half of source
> code. mv88e6xxx_physid_for_family depends on mv88e6xxx_table which
> depends on all _ops structures which depends on all lot of other
> functions.

So this is basically what you are trying to do:

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 903d619e08ed..ef4dbcb052b7 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -3026,6 +3026,18 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
        return err;
 }
 
+static const enum mv88e6xxx_model family_model_table[] = {
+       [MV88E6XXX_FAMILY_6095] = MV88E6XXX_PORT_SWITCH_ID_PROD_6095,
+       [MV88E6XXX_FAMILY_6097] = MV88E6XXX_PORT_SWITCH_ID_PROD_6097,
+       [MV88E6XXX_FAMILY_6185] = MV88E6XXX_PORT_SWITCH_ID_PROD_6185,
+       [MV88E6XXX_FAMILY_6250] = MV88E6XXX_PORT_SWITCH_ID_PROD_6250,
+       [MV88E6XXX_FAMILY_6320] = MV88E6XXX_PORT_SWITCH_ID_PROD_6320,
+       [MV88E6XXX_FAMILY_6341] = MV88E6XXX_PORT_SWITCH_ID_PROD_6341,
+       [MV88E6XXX_FAMILY_6351] = MV88E6XXX_PORT_SWITCH_ID_PROD_6351,
+       [MV88E6XXX_FAMILY_6352] = MV88E6XXX_PORT_SWITCH_ID_PROD_6352,
+       [MV88E6XXX_FAMILY_6390] = MV88E6XXX_PORT_SWITCH_ID_PROD_6390,
+};
+
 static int mv88e6xxx_mdio_read(struct mii_bus *bus, int phy, int reg)
 {
        struct mv88e6xxx_mdio_bus *mdio_bus = bus->priv;
@@ -3056,7 +3068,7 @@ static int mv88e6xxx_mdio_read(struct mii_bus *bus, int phy, int reg)
                         * a PHY,
                         */
                        if (!(val & 0x3f0))
-                               val |= MV88E6XXX_PORT_SWITCH_ID_PROD_6390 >> 4;
+                               val |= family_model_table[chip->info->family] >> 4;
        }

and it compiles. No forward declarations needed. It is missing all the
error checking etc, but i don't see why that should change the
dependencies.

	Andrew