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net: introduce change lower state notifier

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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>
This commit is contained in:
Jiri Pirko
2015-12-03 12:12:15 +01:00
committed by David S. Miller
parent 41f0b04964
commit 04d482660a
2 changed files with 28 additions and 0 deletions
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20
net/core/dev.c
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@@ -5756,6 +5756,26 @@ int dev_get_nest_level(struct net_device *dev,
}
EXPORT_SYMBOL(dev_get_nest_level);
/**
* netdev_lower_change - Dispatch event about lower device state change
* @lower_dev: device
* @lower_state_info: state to dispatch
*
* Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info.
* The caller must hold the RTNL lock.
*/
void netdev_lower_state_changed(struct net_device *lower_dev,
void *lower_state_info)
{
struct netdev_notifier_changelowerstate_info changelowerstate_info;
ASSERT_RTNL();
changelowerstate_info.lower_state_info = lower_state_info;
call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE, lower_dev,
&changelowerstate_info.info);
}
EXPORT_SYMBOL(netdev_lower_state_changed);
static void dev_change_rx_flags(struct net_device *dev, int flags)
{
const struct net_device_ops *ops = dev->netdev_ops;