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Commit 04d48266 authored by Jiri Pirko's avatar Jiri Pirko Committed by David S. Miller
Browse files

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: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 41f0b049

include/linux/netdevice.h

+8 −0
Original line number Diff line number Diff line
@@ -2158,6 +2158,7 @@ struct netdev_lag_upper_info { 
#define NETDEV_CHANGEINFODATA	0x0018

#define NETDEV_BONDING_INFO	0x0019

#define NETDEV_PRECHANGEUPPER	0x001A

#define NETDEV_CHANGELOWERSTATE	0x001B



int register_netdevice_notifier(struct notifier_block *nb);

int unregister_netdevice_notifier(struct notifier_block *nb);
@@ -2179,6 +2180,11 @@ struct netdev_notifier_changeupper_info { 
	void *upper_info; /* upper dev info */

};



struct netdev_notifier_changelowerstate_info {

	struct netdev_notifier_info info; /* must be first */

	void *lower_state_info; /* is lower dev state */

};



static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,

					     struct net_device *dev)

{
@@ -3640,6 +3646,8 @@ void netdev_upper_dev_unlink(struct net_device *dev, 
void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);

void *netdev_lower_dev_get_private(struct net_device *dev,

				   struct net_device *lower_dev);

void netdev_lower_state_changed(struct net_device *lower_dev,

				void *lower_state_info);



/* RSS keys are 40 or 52 bytes long */

#define NETDEV_RSS_KEY_LEN 52

net/core/dev.c

+20 −0
Original line number Diff line number Diff line
@@ -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;