netdev - [RFC net-next 3/7] net: bridge: switchdev: Send FDB notifications for host addresses

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Date:   Sat, 16 Jan 2021 02:25:11 +0100
From:   Tobias Waldekranz <tobias@...dekranz.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        olteanv@...il.com, roopa@...dia.com, nikolay@...dia.com,
        netdev@...r.kernel.org
Subject: [RFC net-next 3/7] 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 <tobias@...dekranz.com>
---
 net/bridge/br_fdb.c       |  4 ++--
 net/bridge/br_private.h   |  7 ++++---
 net/bridge/br_switchdev.c | 11 +++++------
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index b7490237f3fc..1d54ae0f58fb 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -602,7 +602,7 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 			/* fastpath: update of existing entry */
 			if (unlikely(source != fdb->dst &&
 				     !test_bit(BR_FDB_STICKY, &fdb->flags))) {
-				br_switchdev_fdb_notify(fdb, RTM_DELNEIGH);
+				br_switchdev_fdb_notify(br, fdb, RTM_DELNEIGH);
 				fdb->dst = source;
 				fdb_modified = true;
 				/* Take over HW learned entry */
@@ -735,7 +735,7 @@ 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)
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index d62c6e1af64a..a3e20b747eca 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -1568,8 +1568,8 @@ bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
 int br_switchdev_set_port_flag(struct net_bridge_port *p,
 			       unsigned long flags,
 			       unsigned long mask);
-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);
@@ -1615,7 +1615,8 @@ 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)
 {
 }
 
diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
index 1090bb3d4ee0..125637c34f14 100644
--- a/net/bridge/br_switchdev.c
+++ b/net/bridge/br_switchdev.c
@@ -103,7 +103,8 @@ 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)
 {
 	struct switchdev_notifier_fdb_info info = {
 		.addr = fdb->key.addr.addr,
@@ -112,18 +113,16 @@ br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
 		.local = test_bit(BR_FDB_LOCAL, &fdb->flags),
 		.offloaded = test_bit(BR_FDB_OFFLOADED, &fdb->flags),
 	};
-
-	if (!fdb->dst)
-		return;
+	struct net_device *dev = fdb->dst ? fdb->dst->dev : br->dev;
 
 	switch (type) {
 	case RTM_DELNEIGH:
 		call_switchdev_notifiers(SWITCHDEV_FDB_DEL_TO_DEVICE,
-					 fdb->dst->dev, &info.info, NULL);
+					 dev, &info.info, NULL);
 		break;
 	case RTM_NEWNEIGH:
 		call_switchdev_notifiers(SWITCHDEV_FDB_ADD_TO_DEVICE,
-					 fdb->dst->dev, &info.info, NULL);
+					 dev, &info.info, NULL);
 		break;
 	}
 }
-- 
2.17.1