[1/2] bonding: add the debugfs facility to the bonding driver

This patch provides the debugfs facility to the bonding driver.
The "bonding" directory is created in the debugfs root and directories of
each bonding interface (like bond0, bond1...) are created in that.

 # mount -t debugfs none /sys/kernel/debug

 # ls /sys/kernel/debug/bonding
 bond0  bond1

Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>

---
 drivers/net/bonding/Makefile       |    2
 drivers/net/bonding/bond_debugfs.c |   90 +++++++++++++++++++++++++++++++++++++
 drivers/net/bonding/bond_main.c    |   10 +++-
 drivers/net/bonding/bonding.h      |    7 ++
 4 files changed, 107 insertions(+), 2 deletions(-)


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Taku Izumi <izumi.taku@jp.fujitsu.com> wrote:

>
>This patch provides the debugfs facility to the bonding driver.
>The "bonding" directory is created in the debugfs root and directories of
>each bonding interface (like bond0, bond1...) are created in that.
>
> # mount -t debugfs none /sys/kernel/debug
>
> # ls /sys/kernel/debug/bonding
> bond0  bond1
>
>Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
>
>---
> drivers/net/bonding/Makefile       |    2
> drivers/net/bonding/bond_debugfs.c |   90 +++++++++++++++++++++++++++++++++++++
> drivers/net/bonding/bond_main.c    |   10 +++-
> drivers/net/bonding/bonding.h      |    7 ++
> 4 files changed, 107 insertions(+), 2 deletions(-)
>
>Index: net-next/drivers/net/bonding/bond_main.c
>===================================================================
>--- net-next.orig/drivers/net/bonding/bond_main.c
>+++ net-next/drivers/net/bonding/bond_main.c
>@@ -3507,6 +3507,8 @@ static int bond_event_changename(struct
> 	bond_remove_proc_entry(bond);
> 	bond_create_proc_entry(bond);
>
>+	bond_debug_reregister(bond);
>+
> 	return NOTIFY_DONE;
> }
>
>@@ -4789,6 +4791,8 @@ static void bond_uninit(struct net_devic
>
> 	bond_remove_proc_entry(bond);
>
>+	bond_debug_unregister(bond);
>+
> 	__hw_addr_flush(&bond->mc_list);
>
> 	list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
>@@ -5191,6 +5195,8 @@ static int bond_init(struct net_device *
>
> 	bond_prepare_sysfs_group(bond);
>
>+	bond_debug_register(bond);
>+
> 	__hw_addr_init(&bond->mc_list);
> 	return 0;
> }
>@@ -5312,6 +5318,8 @@ static int __init bonding_init(void)
> 	if (res)
> 		goto err_link;
>
>+	bond_create_debugfs();
>+
> 	for (i = 0; i < max_bonds; i++) {
> 		res = bond_create(&init_net, NULL);
> 		if (res)
>@@ -5322,7 +5330,6 @@ static int __init bonding_init(void)
> 	if (res)
> 		goto err;
>
>-
> 	register_netdevice_notifier(&bond_netdev_notifier);
> 	register_inetaddr_notifier(&bond_inetaddr_notifier);
> 	bond_register_ipv6_notifier();
>@@ -5346,6 +5353,7 @@ static void __exit bonding_exit(void)
> 	bond_unregister_ipv6_notifier();
>
> 	bond_destroy_sysfs();
>+	bond_destroy_debugfs();
>
> 	rtnl_link_unregister(&bond_link_ops);
> 	unregister_pernet_subsys(&bond_net_ops);
>Index: net-next/drivers/net/bonding/Makefile
>===================================================================
>--- net-next.orig/drivers/net/bonding/Makefile
>+++ net-next/drivers/net/bonding/Makefile
>@@ -4,7 +4,7 @@
>
> obj-$(CONFIG_BONDING) += bonding.o
>
>-bonding-objs := bond_main.o bond_3ad.o bond_alb.o bond_sysfs.o
>+bonding-objs := bond_main.o bond_3ad.o bond_alb.o bond_sysfs.o bond_debugfs.o
>
> ipv6-$(subst m,y,$(CONFIG_IPV6)) += bond_ipv6.o
> bonding-objs += $(ipv6-y)
>Index: net-next/drivers/net/bonding/bond_debugfs.c
>===================================================================
>--- /dev/null
>+++ net-next/drivers/net/bonding/bond_debugfs.c
>@@ -0,0 +1,90 @@
>+#include <linux/kernel.h>
>+#include <linux/module.h>
>+#include <linux/device.h>
>+#include <linux/netdevice.h>
>+
>+#include "bonding.h"
>+
>+#ifdef CONFIG_DEBUG_FS
>+
>+#include <linux/debugfs.h>
>+#include <linux/seq_file.h>
>+
>+static struct dentry *bonding_debug_root;
>+
>+void bond_debug_register(struct bonding *bond)
>+{
>+	if (!bonding_debug_root)
>+		return;
>+
>+	bond->debug_dir =
>+		debugfs_create_dir(bond->dev->name, bonding_debug_root);
>+
>+	if (!bond->debug_dir) {
>+		pr_warning("%s: Warning: failed to regist to debugfs\n",

	Please spell out "register."

>+			bond->dev->name);
>+		return;
>+	}
>+}
>+
>+void bond_debug_unregister(struct bonding *bond)
>+{
>+	debugfs_remove_recursive(bond->debug_dir);
>+}
>+
>+void bond_debug_reregister(struct bonding *bond)
>+{
>+	struct dentry *d;
>+
>+	if (!bonding_debug_root)
>+		return;
>+
>+	d = debugfs_rename(bonding_debug_root, bond->debug_dir,
>+			   bonding_debug_root, bond->dev->name);
>+	if (d) {
>+		bond->debug_dir = d;
>+	} else {
>+		pr_warning("Warning: failed to re-regist, so unregist this\n");

	Again, please use the entire word.

>+		bond_debug_unregister(bond);
>+	}
>+}
>+
>+void bond_create_debugfs(void)
>+{
>+	bonding_debug_root = debugfs_create_dir("bonding", NULL);
>+
>+	if (!bonding_debug_root) {
>+		pr_warning("Warning: Cannot create bonding directory"
>+				" in debugfs\n");
>+	}
>+}
>+
>+void bond_destroy_debugfs(void)
>+{
>+	debugfs_remove_recursive(bonding_debug_root);
>+}
>+
>+
>+#else /* !CONFIG_DEBUG_FS */
>+
>+void bond_debug_register(struct bonding *bond)
>+{
>+}
>+
>+void bond_debug_unregister(struct bonding *bond)
>+{
>+}
>+
>+void bond_debug_reregister(struct bonding *bond)
>+{
>+}
>+
>+void bond_create_debugfs(void)
>+{
>+}
>+
>+void bond_destroy_debugfs(void)
>+{
>+}
>+
>+#endif /* CONFIG_DEBUG_FS */
>Index: net-next/drivers/net/bonding/bonding.h
>===================================================================
>--- net-next.orig/drivers/net/bonding/bonding.h
>+++ net-next/drivers/net/bonding/bonding.h
>@@ -259,6 +259,8 @@ struct bonding {
> #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
> 	struct   in6_addr master_ipv6;
> #endif
>+	/* debugging suport via debugfs */
>+	struct	 dentry *debug_dir;

	Should this entry be behind #ifdef CONFIG_DEBUG_FS?

> };
>
> /**
>@@ -380,6 +382,11 @@ void bond_select_active_slave(struct bon
> void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
> void bond_register_arp(struct bonding *);
> void bond_unregister_arp(struct bonding *);
>+void bond_create_debugfs(void);
>+void bond_destroy_debugfs(void);
>+void bond_debug_register(struct bonding *bond);
>+void bond_debug_unregister(struct bonding *bond);
>+void bond_debug_reregister(struct bonding *bond);
>
> struct bond_net {
> 	struct net *		net;	/* Associated network namespace */
>

	-J

---
	-Jay Vosburgh, IBM Linux Technology Center, fubar@us.ibm.com
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