tools: ynl-gen: enable code gen for directional specs

I think that user space code gen for directional specs
works after recent changes. Let them through.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl/lib/nlspec.py

@@ -324,6 +324,7 @@ class SpecFamily(SpecElement):
 
     Attributes:
         proto     protocol type (e.g. genetlink)
+        msg_id_model   enum-model for operations (unified, directional etc.)
         license   spec license (loaded from an SPDX tag on the spec)
 
         attr_sets  dict of attribute sets
@@ -349,6 +350,7 @@ class SpecFamily(SpecElement):
         super().__init__(self, spec)
 
         self.proto = self.yaml.get('protocol', 'genetlink')
+        self.msg_id_model = self.yaml['operations'].get('enum-model', 'unified')
 
         if schema_path is None:
             schema_path = os.path.dirname(os.path.dirname(spec_path)) + f'/{self.proto}.yaml'
@@ -477,10 +479,9 @@ class SpecFamily(SpecElement):
             attr_set = self.new_attr_set(elem)
             self.attr_sets[elem['name']] = attr_set
 
-        msg_id_model = self.yaml['operations'].get('enum-model', 'unified')
-        if msg_id_model == 'unified':
+        if self.msg_id_model == 'unified':
             self._dictify_ops_unified()
-        elif msg_id_model == 'directional':
+        elif self.msg_id_model == 'directional':
             self._dictify_ops_directional()
 
         for op in self.msgs.values():

tools/net/ynl/ynl-gen-c.py

@@ -709,9 +709,6 @@ class Operation(SpecOperation):
     def __init__(self, family, yaml, req_value, rsp_value):
         super().__init__(family, yaml, req_value, rsp_value)
 
-        if req_value != rsp_value:
-            raise Exception("Directional messages not supported by codegen")
-
         self.render_name = family.name + '_' + c_lower(self.name)
 
         self.dual_policy = ('do' in yaml and 'request' in yaml['do']) and \
@@ -2243,6 +2240,13 @@ def main():
         os.sys.exit(1)
         return
 
+    supported_models = ['unified']
+    if args.mode == 'user':
+        supported_models += ['directional']
+    if parsed.msg_id_model not in supported_models:
+        print(f'Message enum-model {parsed.msg_id_model} not supported for {args.mode} generation')
+        os.sys.exit(1)
+
     cw = CodeWriter(BaseNlLib(), out_file)
 
     _, spec_kernel = find_kernel_root(args.spec)