[PATCH net-next 03/12] netlink: specs: support setting prefix-name per attribute

[Jakub Kicinski <kuba@kernel.org>]

Ethtool's PSE PoDL has a attr nest with different prefixes:

/* Power Sourcing Equipment */
enum {
	ETHTOOL_A_PSE_UNSPEC,
	ETHTOOL_A_PSE_HEADER,			/* nest - _A_HEADER_* */
	ETHTOOL_A_PODL_PSE_ADMIN_STATE,		/* u32 */
	ETHTOOL_A_PODL_PSE_ADMIN_CONTROL,	/* u32 */
	ETHTOOL_A_PODL_PSE_PW_D_STATUS,		/* u32 */

Header has a prefix of ETHTOOL_A_PSE_ and other attrs prefix of
ETHTOOL_A_PODL_PSE_ we can't cover them uniformly.
If PODL was after PSE life would be easy.

Now we either need to add prefixes to attr names which is yucky
or support setting prefix name per attr.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 Documentation/netlink/genetlink-c.yaml      | 4 ++++
 Documentation/netlink/genetlink-legacy.yaml | 4 ++++
 tools/net/ynl/ynl-gen-c.py                  | 7 +++++--
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/Documentation/netlink/genetlink-c.yaml b/Documentation/netlink/genetlink-c.yaml
index 8e8c17b0a6c6..0519c257ecf4 100644
--- a/Documentation/netlink/genetlink-c.yaml
+++ b/Documentation/netlink/genetlink-c.yaml
@@ -195,6 +195,10 @@ additionalProperties: False
                     description: Max length for a string or a binary attribute.
                     $ref: '#/$defs/len-or-define'
               sub-type: *attr-type
+              # Start genetlink-c
+              name-prefix:
+                type: string
+              # End genetlink-c
 
       # Make sure name-prefix does not appear in subsets (subsets inherit naming)
       dependencies:
diff --git a/Documentation/netlink/genetlink-legacy.yaml b/Documentation/netlink/genetlink-legacy.yaml
index ac4350498f5e..b474889b49ff 100644
--- a/Documentation/netlink/genetlink-legacy.yaml
+++ b/Documentation/netlink/genetlink-legacy.yaml
@@ -226,6 +226,10 @@ additionalProperties: False
                     description: Max length for a string or a binary attribute.
                     $ref: '#/$defs/len-or-define'
               sub-type: *attr-type
+              # Start genetlink-c
+              name-prefix:
+                type: string
+              # End genetlink-c
               # Start genetlink-legacy
               struct:
                 description: Name of the struct type used for the attribute.
diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index 89d9471e9c2b..05b49aa459a7 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -58,8 +58,11 @@ from lib import SpecFamily, SpecAttrSet, SpecAttr, SpecOperation, SpecEnumSet, S
         delattr(self, "enum_name")
 
     def resolve(self):
-        self.enum_name = f"{self.attr_set.name_prefix}{self.name}"
-        self.enum_name = c_upper(self.enum_name)
+        if 'name-prefix' in self.attr:
+            enum_name = f"{self.attr['name-prefix']}{self.name}"
+        else:
+            enum_name = f"{self.attr_set.name_prefix}{self.name}"
+        self.enum_name = c_upper(enum_name)
 
     def is_multi_val(self):
         return None
-- 
2.40.1