[PATCH net-next 2/6] tools: ynl: convert enum selector to string for sub-message parsing

[Hangbin Liu <hangbin.liu@linux.dev>]

From: Hangbin Liu <liuhangbin@kylinos.cn>

YNL sub-message parsing expects a string selector for strcmp(). So for
non-external enum selectors, convert the integer value to its string form
via the family's {enum}_str() helper. This enables correct decoding of
sub-messages keyed by enum values.

Signed-off-by: Hangbin Liu <liuhangbin@kylinos.cn>
---
 tools/net/ynl/pyynl/ynl_gen_c.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/net/ynl/pyynl/ynl_gen_c.py b/tools/net/ynl/pyynl/ynl_gen_c.py
index 2b3483db1b60..45bd7bc834b4 100755
--- a/tools/net/ynl/pyynl/ynl_gen_c.py
+++ b/tools/net/ynl/pyynl/ynl_gen_c.py
@@ -951,9 +951,17 @@ class TypeSubMessage(TypeNest):
             sel_var = f"_sel_{sel}"
         else:
             sel_var = f"{var}->{sel}"
+
+        parse_sel = sel_var
+        if not self.selector.is_external() and self.selector.attr and \
+           "enum" in self.selector.attr.attr:
+            enum_name = self.selector.attr.attr["enum"]
+            str_fn = c_lower(self.family.ident_name + "-" + enum_name) + "_str"
+            parse_sel = f"{str_fn}({sel_var})"
+
         get_lines = [f'if (!{sel_var})',
                      f'return ynl_submsg_failed(yarg, "{self.name}", "{selector}");',
-                     f"if ({self.nested_render_name}_parse(&parg, {sel_var}, attr))",
+                     f"if ({self.nested_render_name}_parse(&parg, {parse_sel}, attr))",
                      "return YNL_PARSE_CB_ERROR;"]
         init_lines = [f"parg.rsp_policy = &{self.nested_render_name}_nest;",
                       f"parg.data = &{var}->{self.c_name};"]

-- 
2.55.0