[patch net-next 03/19] net: bridge: Add support for calling FDB external learning under rcu

[Jiri Pirko]

From: Arkadi Sharshevsky <arka...@mellanox.com>

This is done as a preparation to moving the switchdev notifier chain
to be atomic. The FDB external learning should be called under rtnl
or rcu.

Signed-off-by: Arkadi Sharshevsky <arka...@mellanox.com>
Reviewed-by: Ido Schimmel <ido...@mellanox.com>
Signed-off-by: Jiri Pirko <j...@mellanox.com>
---
 net/bridge/br.c         | 4 ++--
 net/bridge/br_fdb.c     | 2 --
 net/bridge/br_private.h | 6 ++++++
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/net/bridge/br.c b/net/bridge/br.c
index 889e564..e962fff 100644
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -121,7 +121,7 @@ static struct notifier_block br_device_notifier = {
        .notifier_call = br_device_event
 };
 
-/* called with RTNL */
+/* called with RTNL or RCU */
 static int br_switchdev_event(struct notifier_block *unused,
                              unsigned long event, void *ptr)
 {
@@ -131,7 +131,7 @@ static int br_switchdev_event(struct notifier_block *unused,
        struct switchdev_notifier_fdb_info *fdb_info;
        int err = NOTIFY_DONE;
 
-       p = br_port_get_rtnl(dev);
+       p = br_port_get_rtnl_rcu(dev);
        if (!p)
                goto out;
 
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index ab0c7cc..5c780cd 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -1075,7 +1075,6 @@ int br_fdb_external_learn_add(struct net_bridge *br, 
struct net_bridge_port *p,
        struct net_bridge_fdb_entry *fdb;
        int err = 0;
 
-       ASSERT_RTNL();
        spin_lock_bh(&br->hash_lock);
 
        head = &br->hash[br_mac_hash(addr, vid)];
@@ -1110,7 +1109,6 @@ int br_fdb_external_learn_del(struct net_bridge *br, 
struct net_bridge_port *p,
        struct net_bridge_fdb_entry *fdb;
        int err = 0;
 
-       ASSERT_RTNL();
        spin_lock_bh(&br->hash_lock);
 
        fdb = br_fdb_find(br, addr, vid);
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 5dc30ed..69ba3ba 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -288,6 +288,12 @@ static inline struct net_bridge_port 
*br_port_get_rtnl(const struct net_device *
                rtnl_dereference(dev->rx_handler_data) : NULL;
 }
 
+static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct 
net_device *dev)
+{
+       return br_port_exists(dev) ?
+               rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
+}
+
 struct net_bridge {
        spinlock_t                      lock;
        spinlock_t                      hash_lock;
-- 
2.9.3