driver: rawnetworkinterfacedriver: Add managed attribute

Adds an attribute that controls if the driver fully manages the
network interface, which causes it to setup and teardown the interface
on activate and deactivate. This allows users to disable this behavior
if they are externally managing the interface.

Closes: #1728

Signed-off-by: Joshua Watt <Joshua.Watt@garmin.com>
[bst: make documentation more consistent]
Signed-off-by: Bastian Krause <bst@pengutronix.de>

Author: JoshuaWatt

doc/configuration.rst

@@ -3393,7 +3393,9 @@ network interface to the user, including:
   Address Autoconfiguration) and Neighbor Discovery
 - disabling Generic Receive Offload (GRO)
 
-This might change in the future.
+This might change in the future. If you do not want the driver to automatically
+manage the interface (e.g. you are managing it externally), set
+``manage_interface`` to ``False``.
 
 Binds to:
   iface:
@@ -3405,7 +3407,9 @@ Implements:
   - None yet
 
 Arguments:
-  - None
+  - manage_interface (bool, default=True): if ``True`` this driver will
+    setup/teardown the interface on activate/deactivate. Set this to ``False``
+    if you are managing the interface externally.
 
 .. _conf-strategies:
 

labgrid/driver/rawnetworkinterfacedriver.py

@@ -18,22 +18,33 @@
 @target_factory.reg_driver
 @attr.s(eq=False)
 class RawNetworkInterfaceDriver(Driver):
+    """RawNetworkInterface - Manage a network interface and interact with it at a low level
+
+    Args:
+        manage_interface (bool, default=True): if True this driver will
+        setup/teardown the interface on activate/deactivate. Set this to False
+        if you are managing the interface externally.
+    """
+
     bindings = {
         "iface": {"NetworkInterface", "RemoteNetworkInterface", "USBNetworkInterface"},
     }
+    manage_interface = attr.ib(default=True, validator=attr.validators.instance_of(bool))
 
     def __attrs_post_init__(self):
         super().__attrs_post_init__()
         self._record_handle = None
         self._replay_handle = None
 
     def on_activate(self):
-        self._set_interface("up")
-        self._wait_state("up")
+        if self.manage_inteface:
+            self._set_interface("up")
+            self._wait_state("up")
 
     def on_deactivate(self):
-        self._set_interface("down")
-        self._wait_state("down")
+        if self.manage_interface:
+            self._set_interface("down")
+            self._wait_state("down")
 
     def _wrap_command(self, args):
         wrapper = ["sudo", "labgrid-raw-interface"]