tools: ynl-gen: support using pre-defined values in attr checks

Support using pre-defined values in checks so we don't need to use hard
code number for the string, binary length. e.g. we have a definition like

 #define TEAM_STRING_MAX_LEN 32

Which defined in yaml like:

 definitions:
   -
     name: string-max-len
     type: const
     value: 32

It can be used in the attribute-sets like

attribute-sets:
  -
    name: attr-option
    name-prefix: team-attr-option-
    attributes:
      -
        name: name
        type: string
        checks:
          len: string-max-len

With this patch it will be converted to

[TEAM_ATTR_OPTION_NAME] = { .type = NLA_STRING, .len = TEAM_STRING_MAX_LEN, }

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Link: https://lore.kernel.org/r/20240311140727.109562-1-liuhangbin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

5 files changed, 6 insertions, 4 deletions

diff --git a/Documentation/netlink/genetlink-c.yaml b/Documentation/netlink/genetlink-c.yaml
index 3ebd50d788200c..24692a9343f087 100644
--- a/Documentation/netlink/genetlink-c.yaml
+++ b/Documentation/netlink/genetlink-c.yaml
@@ -11,7 +11,7 @@ $defs:
     minimum: 0
   len-or-define:
     type: [ string, integer ]
-    pattern: ^[0-9A-Za-z_]+( - 1)?$
+    pattern: ^[0-9A-Za-z_-]+( - 1)?$
     minimum: 0
   len-or-limit:
     # literal int or limit based on fixed-width type e.g. u8-min, u16-max, etc.
diff --git a/Documentation/netlink/genetlink-legacy.yaml b/Documentation/netlink/genetlink-legacy.yaml
index 1d3fe363770797..b0b7e8bab8a983 100644
--- a/Documentation/netlink/genetlink-legacy.yaml
+++ b/Documentation/netlink/genetlink-legacy.yaml
@@ -11,7 +11,7 @@ $defs:
     minimum: 0
   len-or-define:
     type: [ string, integer ]
-    pattern: ^[0-9A-Za-z_]+( - 1)?$
+    pattern: ^[0-9A-Za-z_-]+( - 1)?$
     minimum: 0
   len-or-limit:
     # literal int or limit based on fixed-width type e.g. u8-min, u16-max, etc.
diff --git a/Documentation/netlink/genetlink.yaml b/Documentation/netlink/genetlink.yaml
index 3283bf458ff13d..d7edb88555630e 100644
--- a/Documentation/netlink/genetlink.yaml
+++ b/Documentation/netlink/genetlink.yaml
@@ -11,7 +11,7 @@ $defs:
     minimum: 0
   len-or-define:
     type: [ string, integer ]
-    pattern: ^[0-9A-Za-z_]+( - 1)?$
+    pattern: ^[0-9A-Za-z_-]+( - 1)?$
     minimum: 0
   len-or-limit:
     # literal int or limit based on fixed-width type e.g. u8-min, u16-max, etc.
diff --git a/Documentation/netlink/netlink-raw.yaml b/Documentation/netlink/netlink-raw.yaml
index 40fc8ab1ee4428..57490e5c1ddf81 100644
--- a/Documentation/netlink/netlink-raw.yaml
+++ b/Documentation/netlink/netlink-raw.yaml
@@ -11,7 +11,7 @@ $defs:
     minimum: 0
   len-or-define:
     type: [ string, integer ]
-    pattern: ^[0-9A-Za-z_]+( - 1)?$
+    pattern: ^[0-9A-Za-z_-]+( - 1)?$
     minimum: 0
 
 # Schema for specs
diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index 67bfaff0515458..5bb7ca01fe510d 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -80,6 +80,8 @@ class Type(SpecAttr):
         value = self.checks.get(limit, default)
         if value is None:
             return value
+        elif value in self.family.consts:
+            return c_upper(f"{self.family['name']}-{value}")
         if not isinstance(value, int):
             value = limit_to_number(value)
         return value