netdev - [PATCH net] tools: ynl: fix setting presence bits in simple nests

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Date: Wed, 20 Mar 2024 19:02:14 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	Jakub Kicinski <kuba@...nel.org>,
	sdf@...gle.com
Subject: [PATCH net] tools: ynl: fix setting presence bits in simple nests

When we set members of simple nested structures in requests
we need to set "presence" bits for all the nesting layers
below. This has nothing to do with the presence type of
the last layer.

Fixes: be5bea1cc0bf ("net: add basic C code generators for Netlink")
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: sdf@...gle.com
---
 tools/net/ynl/ynl-gen-c.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index 6b7eb2d2aaf1..a451cbfbd781 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -228,8 +228,11 @@ from lib import SpecFamily, SpecAttrSet, SpecAttr, SpecOperation, SpecEnumSet, S
         presence = ''
         for i in range(0, len(ref)):
             presence = f"{var}->{'.'.join(ref[:i] + [''])}_present.{ref[i]}"
-            if self.presence_type() == 'bit':
-                code.append(presence + ' = 1;')
+            # Every layer below last is a nest, so we know it uses bit presence
+            # last layer is "self" and may be a complex type
+            if i == len(ref) - 1 and self.presence_type() != 'bit':
+                continue
+            code.append(presence + ' = 1;')
         code += self._setter_lines(ri, member, presence)
 
         func_name = f"{op_prefix(ri, direction, deref=deref)}_set_{'_'.join(ref)}"
-- 
2.44.0