netdev - [PATCH net 1/3] tools: ynl: fully inherit attrs in subsets

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Date:   Wed,  1 Mar 2023 10:36:40 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
        linux-doc@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        corbet@....net, sdf@...gle.com
Subject: [PATCH net 1/3] tools: ynl: fully inherit attrs in subsets

To avoid having to repeat the entire definition of an attribute
(including the value) use the Attr object from the original set.
In fact this is already the documented expectation.

Fixes: be5bea1cc0bf ("net: add basic C code generators for Netlink")
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: corbet@....net
CC: sdf@...gle.com
CC: linux-doc@...r.kernel.org
---
 Documentation/userspace-api/netlink/specs.rst |  3 ++-
 tools/net/ynl/lib/nlspec.py                   | 23 ++++++++++++-------
 2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/Documentation/userspace-api/netlink/specs.rst b/Documentation/userspace-api/netlink/specs.rst
index 6ffe8137cd90..1424ab1b9b33 100644
--- a/Documentation/userspace-api/netlink/specs.rst
+++ b/Documentation/userspace-api/netlink/specs.rst
@@ -199,7 +199,8 @@ The ``value`` property can be skipped, in which case the attribute ID
 will be the value of the previous attribute plus one (recursively)
 and ``0`` for the first attribute in the attribute set.
 
-Note that the ``value`` of an attribute is defined only in its main set.
+Note that the ``value`` of an attribute is defined only in its main set
+(not in subsets).
 
 enum
 ~~~~
diff --git a/tools/net/ynl/lib/nlspec.py b/tools/net/ynl/lib/nlspec.py
index 71da568e2c28..dff31dad36c5 100644
--- a/tools/net/ynl/lib/nlspec.py
+++ b/tools/net/ynl/lib/nlspec.py
@@ -95,15 +95,22 @@ jsonschema = None
         self.attrs = collections.OrderedDict()
         self.attrs_by_val = collections.OrderedDict()
 
-        val = 0
-        for elem in self.yaml['attributes']:
-            if 'value' in elem:
-                val = elem['value']
+        if self.subset_of is None:
+            val = 0
+            for elem in self.yaml['attributes']:
+                if 'value' in elem:
+                    val = elem['value']
 
-            attr = self.new_attr(elem, val)
-            self.attrs[attr.name] = attr
-            self.attrs_by_val[attr.value] = attr
-            val += 1
+                attr = self.new_attr(elem, val)
+                self.attrs[attr.name] = attr
+                self.attrs_by_val[attr.value] = attr
+                val += 1
+        else:
+            real_set = family.attr_sets[self.subset_of]
+            for elem in self.yaml['attributes']:
+                attr = real_set[elem['name']]
+                self.attrs[attr.name] = attr
+                self.attrs_by_val[attr.value] = attr
 
     def new_attr(self, elem, value):
         return SpecAttr(self.family, self, elem, value)
-- 
2.39.2