[PATCH net-next v3 1/8] ynl: support enum-cnt-name attribute in legacy definitions

[Stanislav Fomichev <sdf@fomichev.me>]

This is similar to existing attr-cnt-name in the attributes
to allow changing the name of the 'count' enum entry.

Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
---
 Documentation/netlink/genetlink-c.yaml             | 3 +++
 Documentation/netlink/genetlink-legacy.yaml        | 3 +++
 Documentation/userspace-api/netlink/c-code-gen.rst | 4 +++-
 tools/net/ynl/ynl-gen-c.py                         | 8 ++++++--
 4 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/Documentation/netlink/genetlink-c.yaml b/Documentation/netlink/genetlink-c.yaml
index 4f803eaac6d8..9660ffb1ed6a 100644
--- a/Documentation/netlink/genetlink-c.yaml
+++ b/Documentation/netlink/genetlink-c.yaml
@@ -106,6 +106,9 @@ additionalProperties: False
         name-prefix:
           description: For enum the prefix of the values, optional.
           type: string
+        enum-cnt-name:
+          description: Name of the render-max counter enum entry.
+          type: string
         # End genetlink-c
 
   attribute-sets:
diff --git a/Documentation/netlink/genetlink-legacy.yaml b/Documentation/netlink/genetlink-legacy.yaml
index 8db0e22fa72c..16380e12cabe 100644
--- a/Documentation/netlink/genetlink-legacy.yaml
+++ b/Documentation/netlink/genetlink-legacy.yaml
@@ -117,6 +117,9 @@ additionalProperties: False
         name-prefix:
           description: For enum the prefix of the values, optional.
           type: string
+        enum-cnt-name:
+          description: Name of the render-max counter enum entry.
+          type: string
         # End genetlink-c
         # Start genetlink-legacy
         members:
diff --git a/Documentation/userspace-api/netlink/c-code-gen.rst b/Documentation/userspace-api/netlink/c-code-gen.rst
index 89de42c13350..46415e6d646d 100644
--- a/Documentation/userspace-api/netlink/c-code-gen.rst
+++ b/Documentation/userspace-api/netlink/c-code-gen.rst
@@ -56,7 +56,9 @@ If ``name-prefix`` is specified it replaces the ``$family-$enum``
 portion of the entry name.
 
 Boolean ``render-max`` controls creation of the max values
-(which are enabled by default for attribute enums).
+(which are enabled by default for attribute enums). These max
+values are named ``__$pfx-MAX`` and ``$pfx-MAX``. The name
+of the first value can be overridden via ``enum-cnt-name`` property.
 
 Attributes
 ==========
diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index d8201c4b1520..bfe95826ae3e 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -801,6 +801,7 @@ from lib import SpecFamily, SpecAttrSet, SpecAttr, SpecOperation, SpecEnumSet, S
             self.user_type = 'int'
 
         self.value_pfx = yaml.get('name-prefix', f"{family.ident_name}-{yaml['name']}-")
+        self.enum_cnt_name = yaml.get('enum-cnt-name', None)
 
         super().__init__(family, yaml)
 
@@ -2472,9 +2473,12 @@ _C_KW = {
                     max_val = f' = {enum.get_mask()},'
                     cw.p(max_name + max_val)
                 else:
+                    cnt_name = enum.enum_cnt_name
                     max_name = c_upper(name_pfx + 'max')
-                    cw.p('__' + max_name + ',')
-                    cw.p(max_name + ' = (__' + max_name + ' - 1)')
+                    if not cnt_name:
+                        cnt_name = '__' + name_pfx + 'max'
+                    cw.p(c_upper(cnt_name) + ',')
+                    cw.p(max_name + ' = (' + c_upper(cnt_name) + ' - 1)')
             cw.block_end(line=';')
             cw.nl()
         elif const['type'] == 'const':
-- 
2.47.0