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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David S. Miller

parent
125ecf4b59
commit
573c7ba006
@@ -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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