[PATCH] Device.GeneveDevice: add external property

[Jan Tluka]

This is to support so called lightweight tunnels when tunnel metadata
is defined externally, e.g. using 'ip route .. encap' command.

Since the external flag makes any mandatory options irrelevant, the
mandatory options are defined dynamically.

Signed-off-by: Jan Tluka <jtluka(a)redhat.com&gt;
---
 lnst/Devices/GeneveDevice.py | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/lnst/Devices/GeneveDevice.py b/lnst/Devices/GeneveDevice.py
index a188ef4c..2418c7c9 100644
--- a/lnst/Devices/GeneveDevice.py
+++ b/lnst/Devices/GeneveDevice.py
@@ -21,7 +21,12 @@ from lnst.Devices.SoftDevice import SoftDevice
 class GeneveDevice(SoftDevice):
     _name_template = "t_gnv"
     _link_type = "geneve"
-    _mandatory_opts = ["id", "remote"]
+
+    def __init__(self, ifmanager, *args, **kwargs):
+        if "external" not in kwargs:
+            self._mandatory_opts = ["id", "remote"]
+
+        super(GeneveDevice, self).__init__(ifmanager, *args, **kwargs)
 
     @property
     def id(self):
@@ -63,3 +68,13 @@ class GeneveDevice(SoftDevice):
     def dst_port(self, val):
         self._set_linkinfo_data_attr("IFLA_GENEVE_PORT", int(val))
         self._nl_link_sync("set")
+
+    @property
+    def external(self):
+        return self._get_linkinfo_data_attr("IFLA_GENEVE_COLLECT_METADATA") is
not None
+
+    @external.setter
+    def external(self, val):
+        if val:
+            self._set_linkinfo_data_attr("IFLA_GENEVE_COLLECT_METADATA", True)
+            self._nl_link_sync("set")
-- 
2.26.3