switchdev: introduce switchdev notifier

This patch introduces new notifier for purposes of exposing events which happen
on switch driver side. The consumers of the event messages are mainly involved
masters, namely bridge and ovs.

Suggested-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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);