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| author |   David S. Miller <davem@davemloft.net> | 2015-03-18 22:52:33 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-03-18 22:52:56 -0400 |
| commit | 99c4a26a159b28fa46a3e746a9b41b297e73d261 (patch) | |
| tree | 38f5c5d424b7596b77e1f40d7c5f1ce33cfa115e /include | |
| parent | inet: add a schedule point in inet_twsk_purge() (diff) | |
| download | linux-dev-99c4a26a159b28fa46a3e746a9b41b297e73d261.tar.xz linux-dev-99c4a26a159b28fa46a3e746a9b41b297e73d261.zip | |
net: Fix high overhead of vlan sub-device teardown.
When a networking device is taken down that has a non-trivial number
of VLAN devices configured under it, we eat a full synchronize_net()
for every such VLAN device.
This is because of the call chain:
NETDEV_DOWN notifier
--> vlan_device_event()
--> dev_change_flags()
--> __dev_change_flags()
--> __dev_close()
--> __dev_close_many()
--> dev_deactivate_many()
--> synchronize_net()
This is kind of rediculous because we already have infrastructure for
batching doing operation X to a list of net devices so that we only
incur one sync.
So make use of that by exporting dev_close_many() and adjusting it's
interfaace so that the caller can fully manage the batch list. Use
this in vlan_device_event() and all the overhead goes away.
Reported-by: Salam Noureddine <noureddine@arista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/netdevice.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index ec8f9b5f6500..76951c5fbedf 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -2156,6 +2156,7 @@ struct net_device *__dev_get_by_name(struct net *net, const char *name); int dev_alloc_name(struct net_device *dev, const char *name); int dev_open(struct net_device *dev); int dev_close(struct net_device *dev); +int dev_close_many(struct list_head *head, bool unlink); void dev_disable_lro(struct net_device *dev); int dev_loopback_xmit(struct sk_buff *newskb); int dev_queue_xmit(struct sk_buff *skb); |