net: sparx5: Use Switchdev fdb events for managing fdb entries

Changes the handling of fdb entries to use Switchdev events,
instead of the previous "sync_bridge" and "sync_port" which
only run when adding or removing VLANs on the bridge.
Signed-off-by: Casper Andersson <casper.casan@gmail.com>
Link: https://lore.kernel.org/r/20220314160918.4rfrrfgmbsf2pxl3@wse-c0155Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/microchip/sparx5/sparx5_mactable.c

@@ -286,7 +286,8 @@ static void sparx5_fdb_call_notifiers(enum switchdev_notifier_type type,
 }
 
 int sparx5_add_mact_entry(struct sparx5 *sparx5,
-			  struct sparx5_port *port,
+			  struct net_device *dev,
+			  u16 portno,
 			  const unsigned char *addr, u16 vid)
 {
 	struct sparx5_mact_entry *mact_entry;
@@ -302,14 +303,14 @@ int sparx5_add_mact_entry(struct sparx5 *sparx5,
 	 * mact thread to start the frame will reach CPU and the CPU will
 	 * add the entry but without the extern_learn flag.
 	 */
-	mact_entry = find_mact_entry(sparx5, addr, vid, port->portno);
+	mact_entry = find_mact_entry(sparx5, addr, vid, portno);
 	if (mact_entry)
 		goto update_hw;
 
 	/* Add the entry in SW MAC table not to get the notification when
 	 * SW is pulling again
 	 */
-	mact_entry = alloc_mact_entry(sparx5, addr, vid, port->portno);
+	mact_entry = alloc_mact_entry(sparx5, addr, vid, portno);
 	if (!mact_entry)
 		return -ENOMEM;
 
@@ -318,13 +319,13 @@ int sparx5_add_mact_entry(struct sparx5 *sparx5,
 	mutex_unlock(&sparx5->mact_lock);
 
 update_hw:
-	ret = sparx5_mact_learn(sparx5, port->portno, addr, vid);
+	ret = sparx5_mact_learn(sparx5, portno, addr, vid);
 
 	/* New entry? */
 	if (mact_entry->flags == 0) {
 		mact_entry->flags |= MAC_ENT_LOCK; /* Don't age this */
 		sparx5_fdb_call_notifiers(SWITCHDEV_FDB_ADD_TO_BRIDGE, addr, vid,
-					  port->ndev, true);
+					  dev, true);
 	}
 
 	return ret;

drivers/net/ethernet/microchip/sparx5/sparx5_main.h

@@ -305,7 +305,8 @@ bool sparx5_mact_getnext(struct sparx5 *sparx5,
 int sparx5_mact_forget(struct sparx5 *sparx5,
 		       const unsigned char mac[ETH_ALEN], u16 vid);
 int sparx5_add_mact_entry(struct sparx5 *sparx5,
-			  struct sparx5_port *port,
+			  struct net_device *dev,
+			  u16 portno,
 			  const unsigned char *addr, u16 vid);
 int sparx5_del_mact_entry(struct sparx5 *sparx5,
 			  const unsigned char *addr,

drivers/net/ethernet/microchip/sparx5/sparx5_switchdev.c

@@ -16,6 +16,7 @@ struct sparx5_switchdev_event_work {
 	struct work_struct work;
 	struct switchdev_notifier_fdb_info fdb_info;
 	struct net_device *dev;
+	struct sparx5 *sparx5;
 	unsigned long event;
 };
 
@@ -247,31 +248,34 @@ static void sparx5_switchdev_bridge_fdb_event_work(struct work_struct *work)
 	struct switchdev_notifier_fdb_info *fdb_info;
 	struct sparx5_port *port;
 	struct sparx5 *sparx5;
+	bool host_addr;
 
 	rtnl_lock();
-	if (!sparx5_netdevice_check(dev))
-		goto out;
-
-	port = netdev_priv(dev);
-	sparx5 = port->sparx5;
+	if (!sparx5_netdevice_check(dev)) {
+		host_addr = true;
+		sparx5 = switchdev_work->sparx5;
+	} else {
+		host_addr = false;
+		sparx5 = switchdev_work->sparx5;
+		port = netdev_priv(dev);
+	}
 
 	fdb_info = &switchdev_work->fdb_info;
 
 	switch (switchdev_work->event) {
 	case SWITCHDEV_FDB_ADD_TO_DEVICE:
-		if (!fdb_info->added_by_user)
-			break;
-		sparx5_add_mact_entry(sparx5, port, fdb_info->addr,
-				      fdb_info->vid);
+		if (host_addr)
+			sparx5_add_mact_entry(sparx5, dev, PGID_CPU,
+					      fdb_info->addr, fdb_info->vid);
+		else
+			sparx5_add_mact_entry(sparx5, port->ndev, port->portno,
+					      fdb_info->addr, fdb_info->vid);
 		break;
 	case SWITCHDEV_FDB_DEL_TO_DEVICE:
-		if (!fdb_info->added_by_user)
-			break;
 		sparx5_del_mact_entry(sparx5, fdb_info->addr, fdb_info->vid);
 		break;
 	}
 
-out:
 	rtnl_unlock();
 	kfree(switchdev_work->fdb_info.addr);
 	kfree(switchdev_work);
@@ -283,15 +287,18 @@ static void sparx5_schedule_work(struct work_struct *work)
 	queue_work(sparx5_owq, work);
 }
 
-static int sparx5_switchdev_event(struct notifier_block *unused,
+static int sparx5_switchdev_event(struct notifier_block *nb,
 				  unsigned long event, void *ptr)
 {
 	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
 	struct sparx5_switchdev_event_work *switchdev_work;
 	struct switchdev_notifier_fdb_info *fdb_info;
 	struct switchdev_notifier_info *info = ptr;
+	struct sparx5 *spx5;
 	int err;
 
+	spx5 = container_of(nb, struct sparx5, switchdev_nb);
+
 	switch (event) {
 	case SWITCHDEV_PORT_ATTR_SET:
 		err = switchdev_handle_port_attr_set(dev, ptr,
@@ -307,6 +314,7 @@ static int sparx5_switchdev_event(struct notifier_block *unused,
 
 		switchdev_work->dev = dev;
 		switchdev_work->event = event;
+		switchdev_work->sparx5 = spx5;
 
 		fdb_info = container_of(info,
 					struct switchdev_notifier_fdb_info,
@@ -333,54 +341,6 @@ static int sparx5_switchdev_event(struct notifier_block *unused,
 	return NOTIFY_BAD;
 }
 
-static void sparx5_sync_port_dev_addr(struct sparx5 *sparx5,
-				      struct sparx5_port *port,
-				      u16 vid, bool add)
-{
-	if (!port ||
-	    !test_bit(port->portno, sparx5->bridge_mask))
-		return; /* Skip null/host interfaces */
-
-	/* Bridge connects to vid? */
-	if (add) {
-		/* Add port MAC address from the VLAN */
-		sparx5_mact_learn(sparx5, PGID_CPU,
-				  port->ndev->dev_addr, vid);
-	} else {
-		/* Control port addr visibility depending on
-		 * port VLAN connectivity.
-		 */
-		if (test_bit(port->portno, sparx5->vlan_mask[vid]))
-			sparx5_mact_learn(sparx5, PGID_CPU,
-					  port->ndev->dev_addr, vid);
-		else
-			sparx5_mact_forget(sparx5,
-					   port->ndev->dev_addr, vid);
-	}
-}
-
-static void sparx5_sync_bridge_dev_addr(struct net_device *dev,
-					struct sparx5 *sparx5,
-					u16 vid, bool add)
-{
-	int i;
-
-	/* First, handle bridge address'es */
-	if (add) {
-		sparx5_mact_learn(sparx5, PGID_CPU, dev->dev_addr,
-				  vid);
-		sparx5_mact_learn(sparx5, PGID_BCAST, dev->broadcast,
-				  vid);
-	} else {
-		sparx5_mact_forget(sparx5, dev->dev_addr, vid);
-		sparx5_mact_forget(sparx5, dev->broadcast, vid);
-	}
-
-	/* Now look at bridged ports */
-	for (i = 0; i < SPX5_PORTS; i++)
-		sparx5_sync_port_dev_addr(sparx5, sparx5->ports[i], vid, add);
-}
-
 static int sparx5_handle_port_vlan_add(struct net_device *dev,
 				       struct notifier_block *nb,
 				       const struct switchdev_obj_port_vlan *v)
@@ -392,7 +352,9 @@ static int sparx5_handle_port_vlan_add(struct net_device *dev,
 			container_of(nb, struct sparx5,
 				     switchdev_blocking_nb);
 
-		sparx5_sync_bridge_dev_addr(dev, sparx5, v->vid, true);
+		/* Flood broadcast to CPU */
+		sparx5_mact_learn(sparx5, PGID_BCAST, dev->broadcast,
+				  v->vid);
 		return 0;
 	}
 
@@ -438,7 +400,7 @@ static int sparx5_handle_port_vlan_del(struct net_device *dev,
 			container_of(nb, struct sparx5,
 				     switchdev_blocking_nb);
 
-		sparx5_sync_bridge_dev_addr(dev, sparx5, vid, false);
+		sparx5_mact_forget(sparx5, dev->broadcast, vid);
 		return 0;
 	}
 
@@ -449,9 +411,6 @@ static int sparx5_handle_port_vlan_del(struct net_device *dev,
 	if (ret)
 		return ret;
 
-	/* Delete the port MAC address with the matching VLAN information */
-	sparx5_mact_forget(port->sparx5, port->ndev->dev_addr, vid);
-
 	return 0;
 }