Commit b4ad7baa authored by Scott Feldman's avatar Scott Feldman Committed by David S. Miller
Browse files

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: default avatarScott Feldman <sfeldma@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 023033b1

Documentation/networking/switchdev.txt

+2 −9
Original line number Diff line number Diff line
@@ -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

^^^^^^^^^^^^^^^^^^^^^^^^

drivers/net/ethernet/rocker/rocker.c

+1 −1
Original line number Diff line number Diff line
@@ -4392,7 +4392,7 @@ static int rocker_port_fdb_del(struct rocker_port *rocker_port, 
			       const struct switchdev_obj_fdb *fdb)

{

	__be16 vlan_id = rocker_port_vid_to_vlan(rocker_port, fdb->vid, NULL);

	int flags = ROCKER_OP_FLAG_REMOVE;

	int flags = ROCKER_OP_FLAG_NOWAIT | ROCKER_OP_FLAG_REMOVE;



	if (!rocker_port_is_bridged(rocker_port))

		return -EINVAL;

net/bridge/br_fdb.c

+17 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/atomic.h>

#include <asm/unaligned.h>

#include <linux/if_vlan.h>

#include <net/switchdev.h>

#include "br_private.h"



static struct kmem_cache *br_fdb_cache __read_mostly;
@@ -130,11 +131,27 @@ static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr) 
	}

}



static void fdb_del_external_learn(struct net_bridge_fdb_entry *f)

{

	struct switchdev_obj obj = {

		.id = SWITCHDEV_OBJ_PORT_FDB,

		.u.fdb = {

			.addr = f->addr.addr,

			.vid = f->vlan_id,

		},

	};



	switchdev_port_obj_del(f->dst->dev, &obj);

}



static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)

{

	if (f->is_static)

		fdb_del_hw_addr(br, f->addr.addr);



	if (f->added_by_external_learn)

		fdb_del_external_learn(f);



	hlist_del_rcu(&f->hlist);

	fdb_notify(br, f, RTM_DELNEIGH);

	call_rcu(&f->rcu, fdb_rcu_free);

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