bridge: switchdev: Allow clearing FDB entry offload indication

Currently, an FDB entry only ceases being offloaded when it is deleted.
This changes with VxLAN encapsulation.

Devices capable of performing VxLAN encapsulation usually have only one
FDB table, unlike the software data path which has two - one in the
bridge driver and another in the VxLAN driver.

Therefore, bridge FDB entries pointing to a VxLAN device are only
offloaded if there is a corresponding entry in the VxLAN FDB.

Allow clearing the offload indication in case the corresponding entry
was deleted from the VxLAN FDB.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 12 insertions, 8 deletions

diff --git a/net/bridge/br.c b/net/bridge/br.c
index e411e40333e2..360ad66c21e9 100644
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -151,7 +151,7 @@ static int br_switchdev_event(struct notifier_block *unused,
 			break;
 		}
 		br_fdb_offloaded_set(br, p, fdb_info->addr,
-				     fdb_info->vid);
+				     fdb_info->vid, true);
 		break;
 	case SWITCHDEV_FDB_DEL_TO_BRIDGE:
 		fdb_info = ptr;
@@ -163,7 +163,7 @@ static int br_switchdev_event(struct notifier_block *unused,
 	case SWITCHDEV_FDB_OFFLOADED:
 		fdb_info = ptr;
 		br_fdb_offloaded_set(br, p, fdb_info->addr,
-				     fdb_info->vid);
+				     fdb_info->vid, fdb_info->offloaded);
 		break;
 	}
 
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 74331690a390..e56ba3912a90 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -1152,7 +1152,7 @@ int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 }
 
 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
-			  const unsigned char *addr, u16 vid)
+			  const unsigned char *addr, u16 vid, bool offloaded)
 {
 	struct net_bridge_fdb_entry *fdb;
 
@@ -1160,7 +1160,7 @@ void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
 
 	fdb = br_fdb_find(br, addr, vid);
 	if (fdb)
-		fdb->offloaded = 1;
+		fdb->offloaded = offloaded;
 
 	spin_unlock_bh(&br->hash_lock);
 }
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 10ee39fdca5c..2920e06a5403 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -574,7 +574,7 @@ int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 			      const unsigned char *addr, u16 vid,
 			      bool swdev_notify);
 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
-			  const unsigned char *addr, u16 vid);
+			  const unsigned char *addr, u16 vid, bool offloaded);
 
 /* br_forward.c */
 enum br_pkt_type {
diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
index d77f807420c4..b993df770675 100644
--- a/net/bridge/br_switchdev.c
+++ b/net/bridge/br_switchdev.c
@@ -103,7 +103,7 @@ int br_switchdev_set_port_flag(struct net_bridge_port *p,
 static void
 br_switchdev_fdb_call_notifiers(bool adding, const unsigned char *mac,
 				u16 vid, struct net_device *dev,
-				bool added_by_user)
+				bool added_by_user, bool offloaded)
 {
 	struct switchdev_notifier_fdb_info info;
 	unsigned long notifier_type;
@@ -111,6 +111,7 @@ br_switchdev_fdb_call_notifiers(bool adding, const unsigned char *mac,
 	info.addr = mac;
 	info.vid = vid;
 	info.added_by_user = added_by_user;
+	info.offloaded = offloaded;
 	notifier_type = adding ? SWITCHDEV_FDB_ADD_TO_DEVICE : SWITCHDEV_FDB_DEL_TO_DEVICE;
 	call_switchdev_notifiers(notifier_type, dev, &info.info);
 }
@@ -126,13 +127,15 @@ br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
 		br_switchdev_fdb_call_notifiers(false, fdb->key.addr.addr,
 						fdb->key.vlan_id,
 						fdb->dst->dev,
-						fdb->added_by_user);
+						fdb->added_by_user,
+						fdb->offloaded);
 		break;
 	case RTM_NEWNEIGH:
 		br_switchdev_fdb_call_notifiers(true, fdb->key.addr.addr,
 						fdb->key.vlan_id,
 						fdb->dst->dev,
-						fdb->added_by_user);
+						fdb->added_by_user,
+						fdb->offloaded);
 		break;
 	}
 }
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 3f840b6eea69..5428ef529019 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1478,6 +1478,7 @@ static void dsa_slave_switchdev_event_work(struct work_struct *work)
 			netdev_dbg(dev, "fdb add failed err=%d\n", err);
 			break;
 		}
+		fdb_info->offloaded = true;
 		call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
 					 &fdb_info->info);
 		break;