net: dsa: b53: add MTU configuration support

It looks like the Broadcom switches supported by the b53 driver don't
support precise configuration of the MTU, but just a mumbo-jumbo boolean
flag. Set that.

Also configure BCM583XX devices to send and receive jumbo frames when
ports are configured with 10/100 Mbps speed.

Signed-off-by: Murali Krishna Policharla <murali.policharla@broadcom.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index ceafce4..39ae4ed 100644 (file)
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -699,9 +699,6 @@ int b53_configure_vlan(struct dsa_switch *ds)
                b53_write16(dev, B53_VLAN_PAGE,
                            B53_VLAN_PORT_DEF_TAG(i), def_vid);
 
-       if (!is5325(dev) && !is5365(dev))
-               b53_set_jumbo(dev, dev->enable_jumbo, false);
-
        return 0;
 }
 EXPORT_SYMBOL(b53_configure_vlan);
@@ -807,8 +804,6 @@ static int b53_phy_write16(struct dsa_switch *ds, int addr, int reg, u16 val)
 static int b53_reset_switch(struct b53_device *priv)
 {
        /* reset vlans */
-       priv->enable_jumbo = false;
-
        memset(priv->vlans, 0, sizeof(*priv->vlans) * priv->num_vlans);
        memset(priv->ports, 0, sizeof(*priv->ports) * priv->num_ports);
 
@@ -2065,6 +2060,26 @@ int b53_set_mac_eee(struct dsa_switch *ds, int port, struct ethtool_eee *e)
 }
 EXPORT_SYMBOL(b53_set_mac_eee);
 
+static int b53_change_mtu(struct dsa_switch *ds, int port, int mtu)
+{
+       struct b53_device *dev = ds->priv;
+       bool enable_jumbo;
+       bool allow_10_100;
+
+       if (is5325(dev) || is5365(dev))
+               return -EOPNOTSUPP;
+
+       enable_jumbo = (mtu >= JMS_MIN_SIZE);
+       allow_10_100 = (dev->chip_id == BCM583XX_DEVICE_ID);
+
+       return b53_set_jumbo(dev, enable_jumbo, allow_10_100);
+}
+
+static int b53_get_max_mtu(struct dsa_switch *ds, int port)
+{
+       return JMS_MAX_SIZE;
+}
+
 static const struct dsa_switch_ops b53_switch_ops = {
        .get_tag_protocol       = b53_get_tag_protocol,
        .setup                  = b53_setup,
@@ -2102,6 +2117,8 @@ static const struct dsa_switch_ops b53_switch_ops = {
        .port_mdb_prepare       = b53_mdb_prepare,
        .port_mdb_add           = b53_mdb_add,
        .port_mdb_del           = b53_mdb_del,
+       .port_max_mtu           = b53_get_max_mtu,
+       .port_change_mtu        = b53_change_mtu,
 };
 
 struct b53_chip_data {