net: introduce change lower state notifier
When lower device like bonding slave, team/bridge port, etc changes its state, it is useful for others to notice this change. Currently this is implemented specificly for bonding as NETDEV_BONDING_INFO notifier. This patch aims to replace this specific usage and make this more generic to be used for all upper-lower devices. Introduce NETDEV_CHANGELOWERSTATE netdev notifier type and netdev_lower_state_changed() helper. Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -2158,6 +2158,7 @@ struct netdev_lag_upper_info {
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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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#define NETDEV_CHANGELOWERSTATE 0x001B
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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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@ -2179,6 +2180,11 @@ struct netdev_notifier_changeupper_info {
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void *upper_info; /* upper dev info */
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};
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struct netdev_notifier_changelowerstate_info {
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struct netdev_notifier_info info; /* must be first */
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void *lower_state_info; /* is lower dev state */
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};
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static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
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struct net_device *dev)
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{
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@ -3640,6 +3646,8 @@ void netdev_upper_dev_unlink(struct net_device *dev,
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void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
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void *netdev_lower_dev_get_private(struct net_device *dev,
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struct net_device *lower_dev);
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void netdev_lower_state_changed(struct net_device *lower_dev,
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void *lower_state_info);
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/* RSS keys are 40 or 52 bytes long */
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#define NETDEV_RSS_KEY_LEN 52
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@ -5756,6 +5756,26 @@ int dev_get_nest_level(struct net_device *dev,
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}
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EXPORT_SYMBOL(dev_get_nest_level);
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/**
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* netdev_lower_change - Dispatch event about lower device state change
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* @lower_dev: device
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* @lower_state_info: state to dispatch
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*
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* Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info.
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* The caller must hold the RTNL lock.
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*/
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void netdev_lower_state_changed(struct net_device *lower_dev,
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void *lower_state_info)
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{
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struct netdev_notifier_changelowerstate_info changelowerstate_info;
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ASSERT_RTNL();
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changelowerstate_info.lower_state_info = lower_state_info;
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call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE, lower_dev,
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&changelowerstate_info.info);
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}
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EXPORT_SYMBOL(netdev_lower_state_changed);
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static void dev_change_rx_flags(struct net_device *dev, int flags)
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{
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const struct net_device_ops *ops = dev->netdev_ops;
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