bridge: del external_learned fdbs from device on flush or ageout

We need to delete from offload the device externally learnded fdbs when any
one of these events happen:

1) Bridge ages out fdb.  (When bridge is doing ageing vs. device doing
ageing.  If device is doing ageing, it would send SWITCHDEV_FDB_DEL
directly).

2) STP state change flushes fdbs on port.

3) User uses sysfs interface to flush fdbs from bridge or bridge port:

	echo 1 >/sys/class/net/BR_DEV/bridge/flush
	echo 1 >/sys/class/net/BR_PORT/brport/flush

4) Offload driver send event SWITCHDEV_FDB_DEL to delete fdb entry.

For rocker, we can now get called to delete fdb entry in wait and nowait
contexts, so set NOWAIT flag when deleting fdb entry.

Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 9 deletions

diff --git a/Documentation/networking/switchdev.txt b/Documentation/networking/switchdev.txt
index da82cd7..c5d7ade 100644
--- a/Documentation/networking/switchdev.txt
+++ b/Documentation/networking/switchdev.txt
@@ -251,15 +251,8 @@ out stale FDB entries.  To keep an FDB entry "alive", the driver should refresh
 the FDB entry by calling call_switchdev_notifiers(SWITCHDEV_FDB_ADD, ...).  The
 notification will reset the FDB entry's last-used time to now.  The driver
 should rate limit refresh notifications, for example, no more than once a
-second.  If the FDB entry expires, ndo_fdb_del is called to remove entry from
-the device.  XXX: this last part isn't currently correct: ndo_fdb_del isn't
-called, so the stale entry remains in device...this need to get fixed.
-
-FDB Flush
-^^^^^^^^^
-
-XXX: Unimplemented.  Need to support FDB flush by bridge driver for port and
-remove both static and learned FDB entries.
+second.  If the FDB entry expires, fdb_delete is called to remove entry from
+the device.
 
 STP State Change on Port
 ^^^^^^^^^^^^^^^^^^^^^^^^