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net: bridge: Add support for calling FDB external learning under rcu

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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 <arkadis@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arkadi Sharshevsky 2017-06-08 08:44:12 +02:00 committed by David S. Miller
parent 3922285d96
commit 0baa10fff2
3 changed files with 8 additions and 4 deletions
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4
net/bridge/br.c
View File

@ -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;

2
net/bridge/br_fdb.c
View File

@ -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);

6
net/bridge/br_private.h
View File

@ -284,6 +284,12 @@ 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;