netdev - [PATCH net-next 3/5] tools: ynl-gen: print alloc helper for multi-val attrs

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Message-ID: <20250722161927.3489203-4-kuba@kernel.org>
Date: Tue, 22 Jul 2025 09:19:25 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	andrew+netdev@...n.ch,
	horms@...nel.org,
	donald.hunter@...il.com,
	almasrymina@...gle.com,
	sdf@...ichev.me,
	Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next 3/5] tools: ynl-gen: print alloc helper for multi-val attrs

In general YNL provides allocation and free helpers for types.
For pure nested structs which are used as multi-attr (and therefore
have to be allocated dynamically) we already print a free helper
as it's needed by free of the containing struct.

Add printing of the alloc helper for consistency. The helper
takes the number of entries to allocate as an argument, e.g.:

  static inline struct netdev_queue_id *netdev_queue_id_alloc(unsigned int n)
  {
	return calloc(n, sizeof(struct netdev_queue_id));
  }

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
 tools/net/ynl/pyynl/ynl_gen_c.py | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/tools/net/ynl/pyynl/ynl_gen_c.py b/tools/net/ynl/pyynl/ynl_gen_c.py
index dc78542e6c88..0394b786aa93 100755
--- a/tools/net/ynl/pyynl/ynl_gen_c.py
+++ b/tools/net/ynl/pyynl/ynl_gen_c.py
@@ -2472,11 +2472,22 @@ _C_KW = {
     return 'obj'
 
 
-def print_alloc_wrapper(ri, direction):
+def print_alloc_wrapper(ri, direction, struct=None):
     name = op_prefix(ri, direction)
-    ri.cw.write_func_prot(f'static inline struct {name} *', f"{name}_alloc", [f"void"])
+    struct_name = name
+    if ri.type_name_conflict:
+        struct_name += '_'
+
+    arg = ["void"]
+    cnt = "1"
+    if struct and struct.in_multi_val:
+        arg = ["unsigned int n"]
+        cnt = "n"
+
+    ri.cw.write_func_prot(f'static inline struct {struct_name} *',
+                          f"{name}_alloc", arg)
     ri.cw.block_start()
-    ri.cw.p(f'return calloc(1, sizeof(struct {name}));')
+    ri.cw.p(f'return calloc({cnt}, sizeof(struct {struct_name}));')
     ri.cw.block_end()
 
 
@@ -2547,6 +2558,8 @@ _C_KW = {
     _print_type(ri, "", struct)
 
     if struct.request and struct.in_multi_val:
+        print_alloc_wrapper(ri, "", struct)
+        ri.cw.nl()
         free_rsp_nested_prototype(ri)
         ri.cw.nl()
 
-- 
2.50.1