[RFC PATCH 2/2] libxl: prototype libxl_device_nic_add/remove with IDL

[Nick Rosbrook <rosbrookn@xxxxxxxxx>]

Add a DeviceFunction class and describe prototypes for
libxl_device_nic_add/remove in libxl_types.idl.

Signed-off-by: Nick Rosbrook <rosbrookn@xxxxxxxxxxxx>
--
This is mostly to serve as an example of how the first patch would be
used for function support in the IDL.
---
 tools/libxl/idl.py          | 8 ++++++++
 tools/libxl/libxl_types.idl | 6 ++++++
 2 files changed, 14 insertions(+)

diff --git a/tools/libxl/idl.py b/tools/libxl/idl.py
index 1839871f86..15085af8c7 100644
--- a/tools/libxl/idl.py
+++ b/tools/libxl/idl.py
@@ -386,6 +386,14 @@ class CtxFunction(Function):
 
         Function.__init__(self, name, params, return_type, return_is_status)
 
+class DeviceFunction(CtxFunction):
+    """ A function that modifies a device. """
+    def __init__(self, name=None, device_param=None):
+        params = [ ("domid", uint32), device_param ]
+
+        CtxFunction.__init__(self, name=name, params=params, 
return_type=integer,
+                             return_is_status=True, is_asyncop=True)
+
 def parse(f):
     print("Parsing %s" % f, file=sys.stderr)
 
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 9d3f05f399..22ba93ee4b 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -769,6 +769,12 @@ libxl_device_nic = Struct("device_nic", [
     ("colo_checkpoint_port", string)
     ])
 
+libxl_device_nic_add = DeviceFunction("device_nic_add",
+    ("nic", libxl_device_nic))
+
+libxl_device_nic_remove = DeviceFunction("device_nic_remove",
+    ("nic", libxl_device_nic))
+
 libxl_device_pci = Struct("device_pci", [
     ("func",      uint8),
     ("dev",       uint8),
-- 
2.17.1