net: dsa: qca8k: add support for port fast aging

The switch supports fast aging by flushing any rule in the ARL
table for a specific port.
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/qca8k.c

@@ -1786,6 +1786,16 @@ qca8k_port_bridge_leave(struct dsa_switch *ds, int port, struct net_device *br)
 		  QCA8K_PORT_LOOKUP_MEMBER, BIT(cpu_port));
 }
 
+static void
+qca8k_port_fast_age(struct dsa_switch *ds, int port)
+{
+	struct qca8k_priv *priv = ds->priv;
+
+	mutex_lock(&priv->reg_mutex);
+	qca8k_fdb_access(priv, QCA8K_FDB_FLUSH_PORT, port);
+	mutex_unlock(&priv->reg_mutex);
+}
+
 static int
 qca8k_port_enable(struct dsa_switch *ds, int port,
 		  struct phy_device *phy)
@@ -1994,6 +2004,7 @@ static const struct dsa_switch_ops qca8k_switch_ops = {
 	.port_stp_state_set	= qca8k_port_stp_state_set,
 	.port_bridge_join	= qca8k_port_bridge_join,
 	.port_bridge_leave	= qca8k_port_bridge_leave,
+	.port_fast_age		= qca8k_port_fast_age,
 	.port_fdb_add		= qca8k_port_fdb_add,
 	.port_fdb_del		= qca8k_port_fdb_del,
 	.port_fdb_dump		= qca8k_port_fdb_dump,

drivers/net/dsa/qca8k.h

@@ -262,6 +262,7 @@ enum qca8k_fdb_cmd {
 	QCA8K_FDB_FLUSH	= 1,
 	QCA8K_FDB_LOAD = 2,
 	QCA8K_FDB_PURGE = 3,
+	QCA8K_FDB_FLUSH_PORT = 5,
 	QCA8K_FDB_NEXT = 6,
 	QCA8K_FDB_SEARCH = 7,
 };