net: dsa: install the primary unicast MAC address as standalone port host FDB

To be able to safely turn off CPU flooding for standalone ports, we need
to ensure that the dev_addr of each DSA slave interface is installed as
a standalone host FDB entry for compatible switches.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 1402f93b1de2768c0a15b152847b92a556409d67..6eb728efac43c0d9462bb6fcc72fd11df898b71d 100644 (file)
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -175,6 +175,7 @@ static int dsa_slave_open(struct net_device *dev)
 {
        struct net_device *master = dsa_slave_to_master(dev);
        struct dsa_port *dp = dsa_slave_to_port(dev);
+       struct dsa_switch *ds = dp->ds;
        int err;
 
        err = dev_open(master, NULL);
@@ -183,10 +184,16 @@ static int dsa_slave_open(struct net_device *dev)
                goto out;
        }
 
+       if (dsa_switch_supports_uc_filtering(ds)) {
+               err = dsa_port_standalone_host_fdb_add(dp, dev->dev_addr, 0);
+               if (err)
+                       goto out;
+       }
+
        if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
                err = dev_uc_add(master, dev->dev_addr);
                if (err < 0)
-                       goto out;
+                       goto del_host_addr;
        }
 
        err = dsa_port_enable_rt(dp, dev->phydev);
@@ -198,6 +205,9 @@ static int dsa_slave_open(struct net_device *dev)
 del_unicast:
        if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
                dev_uc_del(master, dev->dev_addr);
+del_host_addr:
+       if (dsa_switch_supports_uc_filtering(ds))
+               dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
 out:
        return err;
 }
@@ -206,12 +216,16 @@ static int dsa_slave_close(struct net_device *dev)
 {
        struct net_device *master = dsa_slave_to_master(dev);
        struct dsa_port *dp = dsa_slave_to_port(dev);
+       struct dsa_switch *ds = dp->ds;
 
        dsa_port_disable_rt(dp);
 
        if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
                dev_uc_del(master, dev->dev_addr);
 
+       if (dsa_switch_supports_uc_filtering(ds))
+               dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
+
        return 0;
 }
 
@@ -244,24 +258,41 @@ static void dsa_slave_set_rx_mode(struct net_device *dev)
 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 {
        struct net_device *master = dsa_slave_to_master(dev);
+       struct dsa_port *dp = dsa_slave_to_port(dev);
+       struct dsa_switch *ds = dp->ds;
        struct sockaddr *addr = a;
        int err;
 
        if (!is_valid_ether_addr(addr->sa_data))
                return -EADDRNOTAVAIL;
 
+       if (dsa_switch_supports_uc_filtering(ds)) {
+               err = dsa_port_standalone_host_fdb_add(dp, addr->sa_data, 0);
+               if (err)
+                       return err;
+       }
+
        if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
                err = dev_uc_add(master, addr->sa_data);
                if (err < 0)
-                       return err;
+                       goto del_unicast;
        }
 
        if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
                dev_uc_del(master, dev->dev_addr);
 
+       if (dsa_switch_supports_uc_filtering(ds))
+               dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
+
        eth_hw_addr_set(dev, addr->sa_data);
 
        return 0;
+
+del_unicast:
+       if (dsa_switch_supports_uc_filtering(ds))
+               dsa_port_standalone_host_fdb_del(dp, addr->sa_data, 0);
+
+       return err;
 }
 
 struct dsa_slave_dump_ctx {