net: bridge: switchdev: send FDB notifications for host addresses

Treat addresses added to the bridge itself in the same way as regular
ports and send out a notification so that drivers may sync it down to
the hardware FDB.

Signed-off-by: Tobias Waldekranz <[email protected]>
Signed-off-by: Vladimir Oltean <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: wkz

net/bridge/br_fdb.c

@@ -607,7 +607,7 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 			/* fastpath: update of existing entry */
 			if (unlikely(source != READ_ONCE(fdb->dst) &&
 				     !test_bit(BR_FDB_STICKY, &fdb->flags))) {
-				br_switchdev_fdb_notify(fdb, RTM_DELNEIGH);
+				br_switchdev_fdb_notify(br, fdb, RTM_DELNEIGH);
 				WRITE_ONCE(fdb->dst, source);
 				fdb_modified = true;
 				/* Take over HW learned entry */
@@ -800,7 +800,7 @@ static void fdb_notify(struct net_bridge *br,
 	int err = -ENOBUFS;
 
 	if (swdev_notify)
-		br_switchdev_fdb_notify(fdb, type);
+		br_switchdev_fdb_notify(br, fdb, type);
 
 	skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
 	if (skb == NULL)

net/bridge/br_private.h

@@ -1654,8 +1654,8 @@ int br_switchdev_set_port_flag(struct net_bridge_port *p,
 			       unsigned long flags,
 			       unsigned long mask,
 			       struct netlink_ext_ack *extack);
-void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
-			     int type);
+void br_switchdev_fdb_notify(struct net_bridge *br,
+			     const struct net_bridge_fdb_entry *fdb, int type);
 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
 			       struct netlink_ext_ack *extack);
 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
@@ -1702,7 +1702,8 @@ static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
 }
 
 static inline void
-br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
+br_switchdev_fdb_notify(struct net_bridge *br,
+			const struct net_bridge_fdb_entry *fdb, int type)
 {
 }
 

net/bridge/br_switchdev.c

@@ -108,9 +108,11 @@ int br_switchdev_set_port_flag(struct net_bridge_port *p,
 }
 
 void
-br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
+br_switchdev_fdb_notify(struct net_bridge *br,
+			const struct net_bridge_fdb_entry *fdb, int type)
 {
 	const struct net_bridge_port *dst = READ_ONCE(fdb->dst);
+	struct net_device *dev = dst ? dst->dev : br->dev;
 	struct switchdev_notifier_fdb_info info = {
 		.addr = fdb->key.addr.addr,
 		.vid = fdb->key.vlan_id,
@@ -119,17 +121,14 @@ br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
 		.offloaded = test_bit(BR_FDB_OFFLOADED, &fdb->flags),
 	};
 
-	if (!dst)
-		return;
-
 	switch (type) {
 	case RTM_DELNEIGH:
 		call_switchdev_notifiers(SWITCHDEV_FDB_DEL_TO_DEVICE,
-					 dst->dev, &info.info, NULL);
+					 dev, &info.info, NULL);
 		break;
 	case RTM_NEWNEIGH:
 		call_switchdev_notifiers(SWITCHDEV_FDB_ADD_TO_DEVICE,
-					 dst->dev, &info.info, NULL);
+					 dev, &info.info, NULL);
 		break;
 	}
 }