net: use batched device unregister in veth and macvlan
veth devices dont use the batched device unregisters yet.
Since veth are a pair of devices, it makes sense to use a batch of two
unregisters, this roughly divides dismantle time by two.
Fix this by changing dellink() callers to always provide a non NULL
head. (Idea from Michał Mirosław)
This patch also handles macvlan case : We now dismantle all macvlans on
top of a lower dev at once.
Reported-by: Alex Bligh <alex@alex.org.uk>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Michał Mirosław <mirqus@gmail.com>
Cc: Jesse Gross <jesse@nicira.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ben Greear <greearb@candelatech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 3ad5425..d7c0bc62 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -785,6 +785,7 @@
struct net_device *dev = ptr;
struct macvlan_dev *vlan, *next;
struct macvlan_port *port;
+ LIST_HEAD(list_kill);
if (!macvlan_port_exists(dev))
return NOTIFY_DONE;
@@ -810,7 +811,9 @@
break;
list_for_each_entry_safe(vlan, next, &port->vlans, list)
- vlan->dev->rtnl_link_ops->dellink(vlan->dev, NULL);
+ vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
+ unregister_netdevice_many(&list_kill);
+ list_del(&list_kill);
break;
case NETDEV_PRE_TYPE_CHANGE:
/* Forbid underlaying device to change its type. */
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 5a160f4..d2ba259 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1501,6 +1501,7 @@
char ifname[IFNAMSIZ];
struct nlattr *tb[IFLA_MAX+1];
int err;
+ LIST_HEAD(list_kill);
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
if (err < 0)
@@ -1524,7 +1525,9 @@
if (!ops)
return -EOPNOTSUPP;
- ops->dellink(dev, NULL);
+ ops->dellink(dev, &list_kill);
+ unregister_netdevice_many(&list_kill);
+ list_del(&list_kill);
return 0;
}