NTB: client event cleanup

Provide a better event interface between the client and transport

Signed-off-by: Jon Mason <jon.mason@intel.com>
diff --git a/include/linux/ntb.h b/include/linux/ntb.h
index f6a1520..cbc792c 100644
--- a/include/linux/ntb.h
+++ b/include/linux/ntb.h
@@ -54,6 +54,11 @@
 	void (*remove) (struct pci_dev *pdev);
 };
 
+enum {
+	NTB_LINK_DOWN = 0,
+	NTB_LINK_UP,
+};
+
 int ntb_register_client(struct ntb_client *drvr);
 void ntb_unregister_client(struct ntb_client *drvr);
 int ntb_register_client_dev(char *device_name);