net: dsa: mv88e6xxx: Implement MTU change

The Marvell Switches support jumbo packages. So implement the
callbacks needed for changing the MTU.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index d995f5b..6f01995 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -2693,6 +2693,31 @@ static int mv88e6xxx_setup_port(struct mv88e6xxx_chip *chip, int port)
        return mv88e6xxx_port_write(chip, port, MV88E6XXX_PORT_DEFAULT_VLAN, 0);
 }
 
+static int mv88e6xxx_get_max_mtu(struct dsa_switch *ds, int port)
+{
+       struct mv88e6xxx_chip *chip = ds->priv;
+
+       if (chip->info->ops->port_set_jumbo_size)
+               return 10240;
+       return 1522;
+}
+
+static int mv88e6xxx_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
+{
+       struct mv88e6xxx_chip *chip = ds->priv;
+       int ret = 0;
+
+       mv88e6xxx_reg_lock(chip);
+       if (chip->info->ops->port_set_jumbo_size)
+               ret = chip->info->ops->port_set_jumbo_size(chip, port, new_mtu);
+       else
+               if (new_mtu > 1522)
+                       ret = -EINVAL;
+       mv88e6xxx_reg_unlock(chip);
+
+       return ret;
+}
+
 static int mv88e6xxx_port_enable(struct dsa_switch *ds, int port,
                                 struct phy_device *phydev)
 {
@@ -5525,6 +5550,8 @@ static const struct dsa_switch_ops mv88e6xxx_switch_ops = {
        .get_sset_count         = mv88e6xxx_get_sset_count,
        .port_enable            = mv88e6xxx_port_enable,
        .port_disable           = mv88e6xxx_port_disable,
+       .port_max_mtu           = mv88e6xxx_get_max_mtu,
+       .port_change_mtu        = mv88e6xxx_change_mtu,
        .get_mac_eee            = mv88e6xxx_get_mac_eee,
        .set_mac_eee            = mv88e6xxx_set_mac_eee,
        .get_eeprom_len         = mv88e6xxx_get_eeprom_len,