1 files changed, 52 insertions, 1 deletions

diff --git a/net/dsa/switch.c b/net/dsa/switch.c
index ce56acdba203..d5bc4bb7310d 100644
--- a/net/dsa/switch.c
+++ b/net/dsa/switch.c
@@ -12,7 +12,12 @@
 #include <linux/if_vlan.h>
 #include <net/switchdev.h>
 
-#include "dsa_priv.h"
+#include "dsa.h"
+#include "netlink.h"
+#include "port.h"
+#include "slave.h"
+#include "switch.h"
+#include "tag_8021q.h"
 
 static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
 						   unsigned int ageing_time)
@@ -1013,6 +1018,52 @@ static int dsa_switch_event(struct notifier_block *nb,
 	return notifier_from_errno(err);
 }
 
+/**
+ * dsa_tree_notify - Execute code for all switches in a DSA switch tree.
+ * @dst: collection of struct dsa_switch devices to notify.
+ * @e: event, must be of type DSA_NOTIFIER_*
+ * @v: event-specific value.
+ *
+ * Given a struct dsa_switch_tree, this can be used to run a function once for
+ * each member DSA switch. The other alternative of traversing the tree is only
+ * through its ports list, which does not uniquely list the switches.
+ */
+int dsa_tree_notify(struct dsa_switch_tree *dst, unsigned long e, void *v)
+{
+	struct raw_notifier_head *nh = &dst->nh;
+	int err;
+
+	err = raw_notifier_call_chain(nh, e, v);
+
+	return notifier_to_errno(err);
+}
+
+/**
+ * dsa_broadcast - Notify all DSA trees in the system.
+ * @e: event, must be of type DSA_NOTIFIER_*
+ * @v: event-specific value.
+ *
+ * Can be used to notify the switching fabric of events such as cross-chip
+ * bridging between disjoint trees (such as islands of tagger-compatible
+ * switches bridged by an incompatible middle switch).
+ *
+ * WARNING: this function is not reliable during probe time, because probing
+ * between trees is asynchronous and not all DSA trees might have probed.
+ */
+int dsa_broadcast(unsigned long e, void *v)
+{
+	struct dsa_switch_tree *dst;
+	int err = 0;
+
+	list_for_each_entry(dst, &dsa_tree_list, list) {
+		err = dsa_tree_notify(dst, e, v);
+		if (err)
+			break;
+	}
+
+	return err;
+}
+
 int dsa_switch_register_notifier(struct dsa_switch *ds)
 {
 	ds->nb.notifier_call = dsa_switch_event;