tools: ynl-gen: support code gen for events

Netlink specs support both events and notifications (former can
define their own message contents). Plug in missing code to
generate types, parsers and include events into notification
tables.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl/lib/nlspec.py

@@ -423,7 +423,7 @@ class SpecFamily(SpecElement):
         self.fixed_header = self.yaml['operations'].get('fixed-header')
         req_val = rsp_val = 1
         for elem in self.yaml['operations']['list']:
-            if 'notify' in elem:
+            if 'notify' in elem or 'event' in elem:
                 if 'value' in elem:
                     rsp_val = elem['value']
                 req_val_next = req_val

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

@@ -828,7 +828,7 @@ class Family(SpecFamily):
                 }
 
     def _load_root_sets(self):
-        for op_name, op in self.ops.items():
+        for op_name, op in self.msgs.items():
             if 'attribute-set' not in op:
                 continue
 
@@ -839,6 +839,8 @@ class Family(SpecFamily):
                     req_attrs.update(set(op[op_mode]['request']['attributes']))
                 if op_mode in op and 'reply' in op[op_mode]:
                     rsp_attrs.update(set(op[op_mode]['reply']['attributes']))
+            if 'event' in op:
+                rsp_attrs.update(set(op['event']['attributes']))
 
             if op['attribute-set'] not in self.root_sets:
                 self.root_sets[op['attribute-set']] = {'request': req_attrs, 'reply': rsp_attrs}
@@ -2193,10 +2195,13 @@ def render_user_family(family, cw, prototype):
     if family.ntfs:
         cw.block_start(line=f"static const struct ynl_ntf_info {family['name']}_ntf_info[] = ")
         for ntf_op_name, ntf_op in family.ntfs.items():
-            if 'notify' not in ntf_op:
-                continue
-            op = family.ops[ntf_op['notify']]
-            ri = RenderInfo(cw, family, "user", op, op.name, "notify")
+            if 'notify' in ntf_op:
+                op = family.ops[ntf_op['notify']]
+                ri = RenderInfo(cw, family, "user", op, op.name, "notify")
+            elif 'event' in ntf_op:
+                ri = RenderInfo(cw, family, "user", ntf_op, ntf_op_name, "event")
+            else:
+                raise Exception('Invalid notification ' + ntf_op_name)
             _render_user_ntf_entry(ri, ntf_op)
         for op_name, op in family.ops.items():
             if 'event' not in op:
@@ -2424,6 +2429,7 @@ def main():
                         raise Exception(f'Only notifications with consistent types supported ({op.name})')
                     print_wrapped_type(ri)
 
+            for op_name, op in parsed.ntfs.items():
                 if 'event' in op:
                     ri = RenderInfo(cw, parsed, args.mode, op, op_name, 'event')
                     cw.p(f"/* {op.enum_name} - event */")
@@ -2485,6 +2491,7 @@ def main():
                         raise Exception(f'Only notifications with consistent types supported ({op.name})')
                     print_ntf_type_free(ri)
 
+            for op_name, op in parsed.ntfs.items():
                 if 'event' in op:
                     cw.p(f"/* {op.enum_name} - event */")