[PATCH net-next v2 3/6] tools: ynl: Add array-nest attr decoding to ynl

[Donald Hunter <donald.hunter@gmail.com>]

Add support for decoding nested arrays of scalars in netlink messages.

Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
---
 tools/net/ynl/lib/ynl.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/net/ynl/lib/ynl.py b/tools/net/ynl/lib/ynl.py
index 32536e1f9064..077ba9e8dc98 100644
--- a/tools/net/ynl/lib/ynl.py
+++ b/tools/net/ynl/lib/ynl.py
@@ -93,6 +93,10 @@ class NlAttr:
     def as_bin(self):
         return self.raw
 
+    def as_array(self, type):
+        format, _ = self.type_formats[type]
+        return list({ x[0] for x in struct.iter_unpack(format, self.raw) })
+
     def __repr__(self):
         return f"[type:{self.type} len:{self._len}] {self.raw}"
 
@@ -381,6 +385,8 @@ class YnlFamily(SpecFamily):
                 decoded = attr.as_bin()
             elif attr_spec["type"] == 'flag':
                 decoded = True
+            elif attr_spec["type"] == 'array-nest':
+                decoded = attr.as_array(attr_spec["sub-type"])
             else:
                 raise Exception(f'Unknown {attr.type} {attr_spec["name"]} {attr_spec["type"]}')
 
-- 
2.39.0