[Patch v2 net-next 1/3] net: bridge: mcast: Add offload failed mdb flag

[Joseph Huang <Joseph.Huang@garmin.com>]

Add MDB_FLAGS_OFFLOAD_FAILED and MDB_PG_FLAGS_OFFLOAD_FAILED to indicate
that an attempt to offload the MDB entry to switchdev has failed.

Signed-off-by: Joseph Huang <Joseph.Huang@garmin.com>
---
 include/uapi/linux/if_bridge.h |  9 +++++----
 net/bridge/br_mdb.c            |  2 ++
 net/bridge/br_private.h        | 20 +++++++++++++++-----
 net/bridge/br_switchdev.c      |  7 ++-----
 4 files changed, 24 insertions(+), 14 deletions(-)

diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index a5b743a2f775..f2a6de424f3f 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -699,10 +699,11 @@ struct br_mdb_entry {
 #define MDB_TEMPORARY 0
 #define MDB_PERMANENT 1
 	__u8 state;
-#define MDB_FLAGS_OFFLOAD	(1 << 0)
-#define MDB_FLAGS_FAST_LEAVE	(1 << 1)
-#define MDB_FLAGS_STAR_EXCL	(1 << 2)
-#define MDB_FLAGS_BLOCKED	(1 << 3)
+#define MDB_FLAGS_OFFLOAD		(1 << 0)
+#define MDB_FLAGS_FAST_LEAVE		(1 << 1)
+#define MDB_FLAGS_STAR_EXCL		(1 << 2)
+#define MDB_FLAGS_BLOCKED		(1 << 3)
+#define MDB_FLAGS_OFFLOAD_FAILED	(1 << 4)
 	__u8 flags;
 	__u16 vid;
 	struct {
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index 1a52a0bca086..0639691cd19b 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -144,6 +144,8 @@ static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
 		e->flags |= MDB_FLAGS_STAR_EXCL;
 	if (flags & MDB_PG_FLAGS_BLOCKED)
 		e->flags |= MDB_FLAGS_BLOCKED;
+	if (flags & MDB_PG_FLAGS_OFFLOAD_FAILED)
+		e->flags |= MDB_FLAGS_OFFLOAD_FAILED;
 }
 
 static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip,
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 1054b8a88edc..5f9d6075017e 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -306,11 +306,12 @@ struct net_bridge_fdb_flush_desc {
 	u16				vlan_id;
 };
 
-#define MDB_PG_FLAGS_PERMANENT	BIT(0)
-#define MDB_PG_FLAGS_OFFLOAD	BIT(1)
-#define MDB_PG_FLAGS_FAST_LEAVE	BIT(2)
-#define MDB_PG_FLAGS_STAR_EXCL	BIT(3)
-#define MDB_PG_FLAGS_BLOCKED	BIT(4)
+#define MDB_PG_FLAGS_PERMANENT		BIT(0)
+#define MDB_PG_FLAGS_OFFLOAD		BIT(1)
+#define MDB_PG_FLAGS_FAST_LEAVE		BIT(2)
+#define MDB_PG_FLAGS_STAR_EXCL		BIT(3)
+#define MDB_PG_FLAGS_BLOCKED		BIT(4)
+#define MDB_PG_FLAGS_OFFLOAD_FAILED	BIT(5)
 
 #define PG_SRC_ENT_LIMIT	32
 
@@ -1343,6 +1344,15 @@ br_multicast_ctx_matches_vlan_snooping(const struct net_bridge_mcast *brmctx)
 
 	return !!(vlan_snooping_enabled == br_multicast_ctx_is_vlan(brmctx));
 }
+
+static inline void
+br_multicast_set_pg_offload_flags(struct net_bridge_port_group *p,
+				  bool offloaded)
+{
+	p->flags &= ~(MDB_PG_FLAGS_OFFLOAD | MDB_PG_FLAGS_OFFLOAD_FAILED);
+	p->flags |= (offloaded ? MDB_PG_FLAGS_OFFLOAD :
+		MDB_PG_FLAGS_OFFLOAD_FAILED);
+}
 #else
 static inline int br_multicast_rcv(struct net_bridge_mcast **brmctx,
 				   struct net_bridge_mcast_port **pmctx,
diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
index 7b41ee8740cb..40f0b16e4df8 100644
--- a/net/bridge/br_switchdev.c
+++ b/net/bridge/br_switchdev.c
@@ -505,9 +505,6 @@ static void br_switchdev_mdb_complete(struct net_device *dev, int err, void *pri
 	struct net_bridge_port *port = data->port;
 	struct net_bridge *br = port->br;
 
-	if (err)
-		goto err;
-
 	spin_lock_bh(&br->multicast_lock);
 	mp = br_mdb_ip_get(br, &data->ip);
 	if (!mp)
@@ -516,11 +513,11 @@ static void br_switchdev_mdb_complete(struct net_device *dev, int err, void *pri
 	     pp = &p->next) {
 		if (p->key.port != port)
 			continue;
-		p->flags |= MDB_PG_FLAGS_OFFLOAD;
+
+		br_multicast_set_pg_offload_flags(p, !err);
 	}
 out:
 	spin_unlock_bh(&br->multicast_lock);
-err:
 	kfree(priv);
 }
 
-- 
2.49.0