switchdev: Add a blocking notifier chain

In general one can't assume that a switchdev notifier is called in a
non-atomic context, and correspondingly, the switchdev notifier chain is
an atomic one.

However, port object addition and deletion messages are delivered from a
process context. Even the MDB addition messages, whose delivery is
scheduled from atomic context, are queued and the delivery itself takes
place in blocking context. For VLAN messages in particular, keeping the
blocking nature is important for error reporting.

Therefore introduce a blocking notifier chain and related service
functions to distribute the notifications for which a blocking context
can be assumed.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 27 insertions, 0 deletions

diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index dd969224a9b9..e021b67b9b32 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -182,10 +182,17 @@ int switchdev_port_obj_add(struct net_device *dev,
                            const struct switchdev_obj *obj);
 int switchdev_port_obj_del(struct net_device *dev,
                            const struct switchdev_obj *obj);
+
 int register_switchdev_notifier(struct notifier_block *nb);
 int unregister_switchdev_notifier(struct notifier_block *nb);
 int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
                              struct switchdev_notifier_info *info);
+
+int register_switchdev_blocking_notifier(struct notifier_block *nb);
+int unregister_switchdev_blocking_notifier(struct notifier_block *nb);
+int call_switchdev_blocking_notifiers(unsigned long val, struct net_device *dev,
+                                      struct switchdev_notifier_info *info);
+
 void switchdev_port_fwd_mark_set(struct net_device *dev,
                                  struct net_device *group_dev,
                                  bool joining);
@@ -241,6 +248,26 @@ static inline int call_switchdev_notifiers(unsigned long val,
         return NOTIFY_DONE;
 }
 
+static inline int
+register_switchdev_blocking_notifier(struct notifier_block *nb)
+{
+        return 0;
+}
+
+static inline int
+unregister_switchdev_blocking_notifier(struct notifier_block *nb)
+{
+        return 0;
+}
+
+static inline int
+call_switchdev_blocking_notifiers(unsigned long val,
+                                  struct net_device *dev,
+                                  struct switchdev_notifier_info *info)
+{
+        return NOTIFY_DONE;
+}
+
 static inline bool switchdev_port_same_parent_id(struct net_device *a,
                                                  struct net_device *b)
 {