rtnetlink: Remove rtnl_register() and rtnl_register_module().

No one uses rtnl_register() and rtnl_register_module().

Let's remove them.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20241014201828.91221-12-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/rtnetlink.h

@@ -29,6 +29,16 @@ static inline enum rtnl_kinds rtnl_msgtype_kind(int msgtype)
 	return msgtype & RTNL_KIND_MASK;
 }
 
+/**
+ *	struct rtnl_msg_handler - rtnetlink message type and handlers
+ *
+ *	@owner: NULL for built-in, THIS_MODULE for module
+ *	@protocol: Protocol family or PF_UNSPEC
+ *	@msgtype: rtnetlink message type
+ *	@doit: Function pointer called for each request message
+ *	@dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
+ *	@flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
+ */
 struct rtnl_msg_handler {
 	struct module *owner;
 	int protocol;
@@ -38,11 +48,6 @@ struct rtnl_msg_handler {
 	int flags;
 };
 
-void rtnl_register(int protocol, int msgtype,
-		   rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
-int rtnl_register_module(struct module *owner, int protocol, int msgtype,
-			 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
-int rtnl_unregister(int protocol, int msgtype);
 void rtnl_unregister_all(int protocol);
 
 int __rtnl_register_many(const struct rtnl_msg_handler *handlers, int n);

net/core/rtnetlink.c

@@ -338,65 +338,14 @@ static int rtnl_register_internal(struct module *owner,
 	return ret;
 }
 
-/**
- * rtnl_register_module - Register a rtnetlink message type
- *
- * @owner: module registering the hook (THIS_MODULE)
- * @protocol: Protocol family or PF_UNSPEC
- * @msgtype: rtnetlink message type
- * @doit: Function pointer called for each request message
- * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
- * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
- *
- * Like rtnl_register, but for use by removable modules.
- */
-int rtnl_register_module(struct module *owner,
-			 int protocol, int msgtype,
-			 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
-			 unsigned int flags)
-{
-	return rtnl_register_internal(owner, protocol, msgtype,
-				      doit, dumpit, flags);
-}
-EXPORT_SYMBOL_GPL(rtnl_register_module);
-
-/**
- * rtnl_register - Register a rtnetlink message type
- * @protocol: Protocol family or PF_UNSPEC
- * @msgtype: rtnetlink message type
- * @doit: Function pointer called for each request message
- * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
- * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
- *
- * Registers the specified function pointers (at least one of them has
- * to be non-NULL) to be called whenever a request message for the
- * specified protocol family and message type is received.
- *
- * The special protocol family PF_UNSPEC may be used to define fallback
- * function pointers for the case when no entry for the specific protocol
- * family exists.
- */
-void rtnl_register(int protocol, int msgtype,
-		   rtnl_doit_func doit, rtnl_dumpit_func dumpit,
-		   unsigned int flags)
-{
-	int err;
-
-	err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit,
-				     flags);
-	if (err)
-		pr_err("Unable to register rtnetlink message handler, "
-		       "protocol = %d, message type = %d\n", protocol, msgtype);
-}
-
 /**
  * rtnl_unregister - Unregister a rtnetlink message type
  * @protocol: Protocol family or PF_UNSPEC
  * @msgtype: rtnetlink message type
  *
  * Returns 0 on success or a negative error code.
  */
-int rtnl_unregister(int protocol, int msgtype)
+static int rtnl_unregister(int protocol, int msgtype)
 {
 	struct rtnl_link __rcu **tab;
 	struct rtnl_link *link;
@@ -419,7 +368,6 @@ int rtnl_unregister(int protocol, int msgtype)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(rtnl_unregister);
 
 /**
  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
@@ -454,6 +402,26 @@ void rtnl_unregister_all(int protocol)
 }
 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 
+/**
+ * __rtnl_register_many - Register rtnetlink message types
+ * @handlers: Array of struct rtnl_msg_handlers
+ * @n: The length of @handlers
+ *
+ * Registers the specified function pointers (at least one of them has
+ * to be non-NULL) to be called whenever a request message for the
+ * specified protocol family and message type is received.
+ *
+ * The special protocol family PF_UNSPEC may be used to define fallback
+ * function pointers for the case when no entry for the specific protocol
+ * family exists.
+ *
+ * When one element of @handlers fails to register,
+ * 1) built-in: panics.
+ * 2) modules : the previous successful registrations are unwinded
+ *              and an error is returned.
+ *
+ * Use rtnl_register_many().
+ */
 int __rtnl_register_many(const struct rtnl_msg_handler *handlers, int n)
 {
 	const struct rtnl_msg_handler *handler;