This atomic notifier is later used by drivers to deliver callbacks to
the core network stack without requireing rtnl lock to be held.
Signed-off-by: Hannes Frederic Sowa <han...@stressinduktion.org>
---
include/linux/netdevice.h | 9 +++++++++
net/core/dev.c | 24 ++++++++++++++++++++++++
2 files changed, 33 insertions(+)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index c20b814e46a072..fb6064c88fc259 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2223,6 +2223,15 @@ netdev_notifier_info_to_dev(const struct
netdev_notifier_info *info)
int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
+enum netdev_atomic_callback_type {
+ PLACEHOLDER = 0x1UL,
+};
+
+int register_netdev_atomic_notifier(struct notifier_block *nb);
+int unregister_netdev_atomic_notifier(struct notifier_block *nb);
+int call_netdev_atomic_notifiers(enum netdev_atomic_callback_type type,
+ struct net_device *dev);
+
extern rwlock_t dev_base_lock; /*
Device list lock */
diff --git a/net/core/dev.c b/net/core/dev.c
index 914b4a24c65436..e96248d955f1aa 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -7840,6 +7840,30 @@ define_netdev_printk_level(netdev_warn, KERN_WARNING);
define_netdev_printk_level(netdev_notice, KERN_NOTICE);
define_netdev_printk_level(netdev_info, KERN_INFO);
+static ATOMIC_NOTIFIER_HEAD(netdev_atomic_notifier_chain);
+
+int register_netdev_atomic_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&netdev_atomic_notifier_chain,
+ nb);
+}
+EXPORT_SYMBOL_GPL(register_netdev_atomic_notifier);
+
+int unregister_netdev_atomic_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&netdev_atomic_notifier_chain,
+ nb);
+}
+EXPORT_SYMBOL_GPL(unregister_netdev_atomic_notifier);
+
+int call_netdev_atomic_notifiers(enum netdev_atomic_callback_type type,
+ struct net_device *dev)
+{
+ return atomic_notifier_call_chain(&netdev_atomic_notifier_chain,
+ type, dev);
+}
+EXPORT_SYMBOL_GPL(call_netdev_atomic_notifiers);
+
static void __net_exit netdev_exit(struct net *net)
{
kfree(net->dev_name_head);
--
2.5.0
--
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