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net: introduce pre-change upper device notifier

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This newly introduced netdevice notifier is called before actual change
upper happens. That provides a possibility for notifier handlers to
know upper change will happen and react to it, including possibility to
forbid the change. That is valuable for drivers which can check if the
upper device linkage is supported and forbid that in case it is not.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2015-10-16 14:01:22 +02:00 committed by David S. Miller
parent 125ecf4b59
commit 573c7ba006
2 changed files with 10 additions and 0 deletions
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1
include/linux/netdevice.h
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@ -2106,6 +2106,7 @@ struct pcpu_sw_netstats {
#define NETDEV_PRECHANGEMTU 0x0017 /* notify before mtu change happened */
#define NETDEV_CHANGEINFODATA 0x0018
#define NETDEV_BONDING_INFO 0x0019
#define NETDEV_PRECHANGEUPPER 0x001A
int register_netdevice_notifier(struct notifier_block *nb);
int unregister_netdevice_notifier(struct notifier_block *nb);

9
net/core/dev.c
View File

@ -5346,6 +5346,12 @@ static int __netdev_upper_dev_link(struct net_device *dev,
changeupper_info.master = master;
changeupper_info.linking = true;
ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev,
&changeupper_info.info);
ret = notifier_to_errno(ret);
if (ret)
return ret;
ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, private,
master);
if (ret)
@ -5488,6 +5494,9 @@ void netdev_upper_dev_unlink(struct net_device *dev,
changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev;
changeupper_info.linking = false;
call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev,
&changeupper_info.info);
__netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
/* Here is the tricky part. We must remove all dev's lower