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bridge: vlan: move back vlan_flush 

Ido Schimmel reported a problem with switchdev devices because of the
order change of del_nbp operations, more specifically the move of
nbp_vlan_flush() which deletes all vlans and frees vlgrp after the
rx_handler has been unregistered. So in order to fix this move
vlan_flush back where it was and make it destroy the rhtable after
NULLing vlgrp and waiting a grace period to make sure noone can see it.

Reported-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2015-10-12 21:47:05 +02:00 committed by David S. Miller
parent b8d02c3cac
commit f409d0ed87
3 changed files with 25 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
net/bridge/br_if.c
View File

@ -248,6 +248,7 @@ static void del_nbp(struct net_bridge_port *p)
list_del_rcu(&p->list);
nbp_vlan_flush(p);
br_fdb_delete_by_port(br, p, 0, 1);
nbp_update_port_count(br);
@ -256,8 +257,6 @@ static void del_nbp(struct net_bridge_port *p)
dev->priv_flags &= ~IFF_BRIDGE_PORT;
netdev_rx_handler_unregister(dev);
/* use the synchronize_rcu done by netdev_rx_handler_unregister */
nbp_vlan_flush(p);
br_multicast_del_port(p);

1
net/bridge/br_private.h
View File

@ -132,7 +132,6 @@ struct net_bridge_vlan_group {
struct list_head vlan_list;
u16 num_vlans;
u16 pvid;
struct rcu_head rcu;
};
struct net_bridge_fdb_entry

31
net/bridge/br_vlan.c
View File

@ -307,15 +307,20 @@ out:
return err;
}
static void __vlan_flush(struct net_bridge_vlan_group *vlgrp)
static void __vlan_group_free(struct net_bridge_vlan_group *vg)
{
WARN_ON(!list_empty(&vg->vlan_list));
rhashtable_destroy(&vg->vlan_hash);
kfree(vg);
}
static void __vlan_flush(struct net_bridge_vlan_group *vg)
{
struct net_bridge_vlan *vlan, *tmp;
__vlan_delete_pvid(vlgrp, vlgrp->pvid);
list_for_each_entry_safe(vlan, tmp, &vlgrp->vlan_list, vlist)
__vlan_delete_pvid(vg, vg->pvid);
list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist)
__vlan_del(vlan);
rhashtable_destroy(&vlgrp->vlan_hash);
kfree_rcu(vlgrp, rcu);
}
struct sk_buff *br_handle_vlan(struct net_bridge *br,
@ -571,9 +576,15 @@ int br_vlan_delete(struct net_bridge *br, u16 vid)
void br_vlan_flush(struct net_bridge *br)
{
struct net_bridge_vlan_group *vg;
ASSERT_RTNL();
__vlan_flush(br_vlan_group(br));
vg = br_vlan_group(br);
__vlan_flush(vg);
RCU_INIT_POINTER(br->vlgrp, NULL);
synchronize_rcu();
__vlan_group_free(vg);
}
struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
@ -959,7 +970,13 @@ int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
void nbp_vlan_flush(struct net_bridge_port *port)
{
struct net_bridge_vlan_group *vg;
ASSERT_RTNL();
__vlan_flush(nbp_vlan_group(port));
vg = nbp_vlan_group(port);
__vlan_flush(vg);
RCU_INIT_POINTER(port->vlgrp, NULL);
synchronize_rcu();
__vlan_group_free(vg);
}