1 files changed, 65 insertions, 0 deletions

diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index d162b21b14bd..22e02f4edd99 100644
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -11,6 +11,8 @@
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/notifier.h>
 #include <linux/netdevice.h>
 #include <net/switchdev.h>
 
@@ -50,3 +52,66 @@ int netdev_switch_port_stp_update(struct net_device *dev, u8 state)
         return ops->ndo_switch_port_stp_update(dev, state);
 }
 EXPORT_SYMBOL(netdev_switch_port_stp_update);
+
+static DEFINE_MUTEX(netdev_switch_mutex);
+static RAW_NOTIFIER_HEAD(netdev_switch_notif_chain);
+
+/**
+ *      register_netdev_switch_notifier - Register nofifier
+ *      @nb: notifier_block
+ *
+ *      Register switch device notifier. This should be used by code
+ *      which needs to monitor events happening in particular device.
+ *      Return values are same as for atomic_notifier_chain_register().
+ */
+int register_netdev_switch_notifier(struct notifier_block *nb)
+{
+        int err;
+
+        mutex_lock(&netdev_switch_mutex);
+        err = raw_notifier_chain_register(&netdev_switch_notif_chain, nb);
+        mutex_unlock(&netdev_switch_mutex);
+        return err;
+}
+EXPORT_SYMBOL(register_netdev_switch_notifier);
+
+/**
+ *      unregister_netdev_switch_notifier - Unregister nofifier
+ *      @nb: notifier_block
+ *
+ *      Unregister switch device notifier.
+ *      Return values are same as for atomic_notifier_chain_unregister().
+ */
+int unregister_netdev_switch_notifier(struct notifier_block *nb)
+{
+        int err;
+
+        mutex_lock(&netdev_switch_mutex);
+        err = raw_notifier_chain_unregister(&netdev_switch_notif_chain, nb);
+        mutex_unlock(&netdev_switch_mutex);
+        return err;
+}
+EXPORT_SYMBOL(unregister_netdev_switch_notifier);
+
+/**
+ *      call_netdev_switch_notifiers - Call nofifiers
+ *      @val: value passed unmodified to notifier function
+ *      @dev: port device
+ *      @info: notifier information data
+ *
+ *      Call all network notifier blocks. This should be called by driver
+ *      when it needs to propagate hardware event.
+ *      Return values are same as for atomic_notifier_call_chain().
+ */
+int call_netdev_switch_notifiers(unsigned long val, struct net_device *dev,
+                                 struct netdev_switch_notifier_info *info)
+{
+        int err;
+
+        info->dev = dev;
+        mutex_lock(&netdev_switch_mutex);
+        err = raw_notifier_call_chain(&netdev_switch_notif_chain, val, info);
+        mutex_unlock(&netdev_switch_mutex);
+        return err;
+}
+EXPORT_SYMBOL(call_netdev_switch_notifiers);