netdev - [PATCH net-next v5 01/25] netlink: add NLA_POLICY_MAX

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Date: Thu, 27 Jun 2024 15:08:19 +0200
From: Antonio Quartulli <antonio@...nvpn.net>
To: netdev@...r.kernel.org
Cc: kuba@...nel.org,
	ryazanov.s.a@...il.com,
	pabeni@...hat.com,
	edumazet@...gle.com,
	andrew@...n.ch,
	sd@...asysnail.net,
	Antonio Quartulli <antonio@...nvpn.net>,
	donald.hunter@...il.com
Subject: [PATCH net-next v5 01/25] netlink: add NLA_POLICY_MAX_LEN macro

Similarly to NLA_POLICY_MIN_LEN, NLA_POLICY_MAX_LEN defines a policy
with a maximum length value.

The netlink generator for YAML specs has been extended accordingly.

Cc: donald.hunter@...il.com
Signed-off-by: Antonio Quartulli <antonio@...nvpn.net>
---
 include/net/netlink.h      | 1 +
 tools/net/ynl/ynl-gen-c.py | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/include/net/netlink.h b/include/net/netlink.h
index e78ce008e07c..31d83f6a465b 100644
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -469,6 +469,7 @@ struct nla_policy {
 	.max = _len						\
 }
 #define NLA_POLICY_MIN_LEN(_len)	NLA_POLICY_MIN(NLA_BINARY, _len)
+#define NLA_POLICY_MAX_LEN(_len)	NLA_POLICY_MAX(NLA_BINARY, _len)
 
 /**
  * struct nl_info - netlink source information
diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index 374ca5e86e24..5910ecd38081 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -466,6 +466,8 @@ class TypeBinary(Type):
     def _attr_policy(self, policy):
         if 'exact-len' in self.checks:
             mem = 'NLA_POLICY_EXACT_LEN(' + str(self.get_limit('exact-len')) + ')'
+        elif 'max-len' in self.checks:
+            mem = 'NLA_POLICY_MAX_LEN(' + str(self.get_limit('max-len')) + ')'
         else:
             mem = '{ '
             if len(self.checks) == 1 and 'min-len' in self.checks:
-- 
2.44.2