net: introduce pre-change upper device notifier
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>
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@ -2106,6 +2106,7 @@ struct pcpu_sw_netstats {
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#define NETDEV_PRECHANGEMTU 0x0017 /* notify before mtu change happened */
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#define NETDEV_CHANGEINFODATA 0x0018
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#define NETDEV_BONDING_INFO 0x0019
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#define NETDEV_PRECHANGEUPPER 0x001A
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int register_netdevice_notifier(struct notifier_block *nb);
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int unregister_netdevice_notifier(struct notifier_block *nb);
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@ -5346,6 +5346,12 @@ static int __netdev_upper_dev_link(struct net_device *dev,
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changeupper_info.master = master;
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changeupper_info.linking = true;
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ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev,
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&changeupper_info.info);
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ret = notifier_to_errno(ret);
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if (ret)
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return ret;
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ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, private,
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master);
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if (ret)
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@ -5488,6 +5494,9 @@ void netdev_upper_dev_unlink(struct net_device *dev,
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changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev;
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changeupper_info.linking = false;
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call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev,
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&changeupper_info.info);
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__netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
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/* Here is the tricky part. We must remove all dev's lower
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