[PATCH net-next 1/3] tools: ynl: correctly handle overrides of fields in subset

[Jakub Kicinski <kuba@kernel.org>]

We stated in documentation [1] and previous discussions [2]
that the need for overriding fields in members of subsets
is anticipated. Implement it.

[1] https://docs.kernel.org/next/userspace-api/netlink/specs.html#subset-of
[2] https://lore.kernel.org/netdev/20231004171350.1f59cd1d@kernel.org/

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 tools/net/ynl/lib/nlspec.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/net/ynl/lib/nlspec.py b/tools/net/ynl/lib/nlspec.py
index a745739655ad..314ec8007496 100644
--- a/tools/net/ynl/lib/nlspec.py
+++ b/tools/net/ynl/lib/nlspec.py
@@ -219,7 +219,10 @@ jsonschema = None
         else:
             real_set = family.attr_sets[self.subset_of]
             for elem in self.yaml['attributes']:
-                attr = real_set[elem['name']]
+                real_attr = real_set[elem['name']]
+                combined_elem = real_attr.yaml | elem
+                attr = self.new_attr(combined_elem, real_attr.value)
+
                 self.attrs[attr.name] = attr
                 self.attrs_by_val[attr.value] = attr
 
-- 
2.47.1