netdevsim: put netdevsim bus code into separate file

As the code related to netdevsim bus is going to get bigger, move the
existing code to a separate file.
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/netdevsim/Makefile

@@ -3,7 +3,7 @@
 obj-$(CONFIG_NETDEVSIM) += netdevsim.o
 
 netdevsim-objs := \
-	netdev.o dev.o fib.o sdev.o
+	netdev.o dev.o fib.o sdev.o bus.o
 
 ifeq ($(CONFIG_BPF_SYSCALL),y)
 netdevsim-objs += \

drivers/net/netdevsim/bus.c

+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2017 Netronome Systems, Inc.
+ * Copyright (C) 2019 Mellanox Technologies. All rights reserved
+ */
+
+#include <linux/device.h>
+
+#include "netdevsim.h"
+
+struct bus_type nsim_bus = {
+	.name		= DRV_NAME,
+	.dev_name	= DRV_NAME,
+	.num_vf		= nsim_num_vf,
+};
+
+int nsim_bus_init(void)
+{
+	return bus_register(&nsim_bus);
+}
+
+void nsim_bus_exit(void)
+{
+	bus_unregister(&nsim_bus);
+}

drivers/net/netdevsim/netdev.c

@@ -42,19 +42,13 @@ struct nsim_vf_config {
 
 static struct dentry *nsim_ddir;
 
-static int nsim_num_vf(struct device *dev)
+int nsim_num_vf(struct device *dev)
 {
 	struct netdevsim *ns = to_nsim(dev);
 
 	return ns->num_vfs;
 }
 
-static struct bus_type nsim_bus = {
-	.name		= DRV_NAME,
-	.dev_name	= DRV_NAME,
-	.num_vf		= nsim_num_vf,
-};
-
 static int nsim_vfs_enable(struct netdevsim *ns, unsigned int num_vfs)
 {
 	ns->vfconfigs = kcalloc(num_vfs, sizeof(struct nsim_vf_config),
@@ -544,18 +538,18 @@ static int __init nsim_module_init(void)
 	if (err)
 		goto err_debugfs_destroy;
 
-	err = bus_register(&nsim_bus);
+	err = nsim_bus_init();
 	if (err)
 		goto err_sdev_exit;
 
 	err = rtnl_link_register(&nsim_link_ops);
 	if (err)
-		goto err_unreg_bus;
+		goto err_bus_exit;
 
 	return 0;
 
-err_unreg_bus:
-	bus_unregister(&nsim_bus);
+err_bus_exit:
+	nsim_bus_exit();
 err_sdev_exit:
 	nsim_sdev_exit();
 err_debugfs_destroy:
@@ -566,7 +560,7 @@ static int __init nsim_module_init(void)
 static void __exit nsim_module_exit(void)
 {
 	rtnl_link_unregister(&nsim_link_ops);
-	bus_unregister(&nsim_bus);
+	nsim_bus_exit();
 	nsim_sdev_exit();
 	debugfs_remove_recursive(nsim_ddir);
 }

drivers/net/netdevsim/netdevsim.h

@@ -188,3 +188,10 @@ static inline struct netdevsim *to_nsim(struct device *ptr)
 {
 	return container_of(ptr, struct netdevsim, dev);
 }
+
+int nsim_num_vf(struct device *dev);
+
+extern struct bus_type nsim_bus;
+
+int nsim_bus_init(void);
+void nsim_bus_exit(void);