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net: bridge: add helper to replay VLANs installed on port

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Currently this simple setup with DSA:

ip link add br0 type bridge vlan_filtering 1
ip link add bond0 type bond
ip link set bond0 master br0
ip link set swp0 master bond0

will not work because the bridge has created the PVID in br_add_if ->
nbp_vlan_init, and it has notified switchdev of the existence of VLAN 1,
but that was too early, since swp0 was not yet a lower of bond0, so it
had no reason to act upon that notification.

We need a helper in the bridge to replay the switchdev VLAN objects that
were notified since the bridge port creation, because some of them may
have been missed.

As opposed to the br_mdb_replay function, the vg->vlan_list write side
protection is offered by the rtnl_mutex which is sleepable, so we don't
need to queue up the objects in atomic context, we can replay them right
away.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2021-03-23 01:51:46 +02:00 • committed by David S. Miller
parent 04846f903b
commit 22f67cdfae
2 changed files with 83 additions and 0 deletions
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10
include/linux/if_bridge.h
View file

@ -111,6 +111,8 @@ int br_vlan_get_pvid_rcu(const struct net_device *dev, u16 *p_pvid);
int br_vlan_get_proto(const struct net_device *dev, u16 *p_proto);
int br_vlan_get_info(const struct net_device *dev, u16 vid,
struct bridge_vlan_info *p_vinfo);
int br_vlan_replay(struct net_device *br_dev, struct net_device *dev,
struct notifier_block *nb, struct netlink_ext_ack *extack);
#else
static inline bool br_vlan_enabled(const struct net_device *dev)
{
@ -137,6 +139,14 @@ static inline int br_vlan_get_info(const struct net_device *dev, u16 vid,
{
return -EINVAL;
}
static inline int br_vlan_replay(struct net_device *br_dev,
struct net_device *dev,
struct notifier_block *nb,
struct netlink_ext_ack *extack)
{
return -EOPNOTSUPP;
}
#endif
#if IS_ENABLED(CONFIG_BRIDGE)