6lowpan: add debugfs support

This patch will introduce a 6lowpan entry into the debugfs if enabled.
Inside this 6lowpan directory we create a subdirectories of all 6lowpan
interfaces to offer a per interface debugfs support.

Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring 2015-12-09 22:46:30 +01:00 committed by Marcel Holtmann
parent 00f5931411
commit b1815fd949
6 changed files with 120 additions and 1 deletions

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@ -53,6 +53,8 @@
#ifndef __6LOWPAN_H__
#define __6LOWPAN_H__
#include <linux/debugfs.h>
#include <net/ipv6.h>
#include <net/net_namespace.h>
@ -98,6 +100,7 @@ enum lowpan_lltypes {
struct lowpan_priv {
enum lowpan_lltypes lltype;
struct dentry *iface_debugfs;
/* must be last */
u8 priv[0] __aligned(sizeof(void *));

28
net/6lowpan/6lowpan_i.h Normal file
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@ -0,0 +1,28 @@
#ifndef __6LOWPAN_I_H
#define __6LOWPAN_I_H
#include <linux/netdevice.h>
#ifdef CONFIG_6LOWPAN_DEBUGFS
int lowpan_dev_debugfs_init(struct net_device *dev);
void lowpan_dev_debugfs_exit(struct net_device *dev);
int __init lowpan_debugfs_init(void);
void lowpan_debugfs_exit(void);
#else
static inline int lowpan_dev_debugfs_init(struct net_device *dev)
{
return 0;
}
static inline void lowpan_dev_debugfs_exit(struct net_device *dev) { }
static inline int __init lowpan_debugfs_init(void)
{
return 0;
}
static inline void lowpan_debugfs_exit(void) { }
#endif /* CONFIG_6LOWPAN_DEBUGFS */
#endif /* __6LOWPAN_I_H */

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@ -5,6 +5,14 @@ menuconfig 6LOWPAN
This enables IPv6 over Low power Wireless Personal Area Network -
"6LoWPAN" which is supported by IEEE 802.15.4 or Bluetooth stacks.
config 6LOWPAN_DEBUGFS
bool "6LoWPAN debugfs support"
depends on 6LOWPAN
depends on DEBUG_FS
---help---
This enables 6LoWPAN debugfs support. For example to manipulate
IPHC context information at runtime.
menuconfig 6LOWPAN_NHC
tristate "Next Header and Generic Header Compression Support"
depends on 6LOWPAN

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@ -1,6 +1,7 @@
obj-$(CONFIG_6LOWPAN) += 6lowpan.o
6lowpan-y := core.o iphc.o nhc.o
6lowpan-$(CONFIG_6LOWPAN_DEBUGFS) += debugfs.o
#rfc6282 nhcs
obj-$(CONFIG_6LOWPAN_NHC_DEST) += nhc_dest.o

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@ -15,9 +15,13 @@
#include <net/6lowpan.h>
#include "6lowpan_i.h"
int lowpan_register_netdevice(struct net_device *dev,
enum lowpan_lltypes lltype)
{
int ret;
dev->addr_len = EUI64_ADDR_LEN;
dev->type = ARPHRD_6LOWPAN;
dev->mtu = IPV6_MIN_MTU;
@ -25,7 +29,15 @@ int lowpan_register_netdevice(struct net_device *dev,
lowpan_priv(dev)->lltype = lltype;
return register_netdevice(dev);
ret = lowpan_dev_debugfs_init(dev);
if (ret < 0)
return ret;
ret = register_netdevice(dev);
if (ret < 0)
lowpan_dev_debugfs_exit(dev);
return ret;
}
EXPORT_SYMBOL(lowpan_register_netdevice);
@ -44,6 +56,7 @@ EXPORT_SYMBOL(lowpan_register_netdev);
void lowpan_unregister_netdevice(struct net_device *dev)
{
unregister_netdevice(dev);
lowpan_dev_debugfs_exit(dev);
}
EXPORT_SYMBOL(lowpan_unregister_netdevice);
@ -57,6 +70,12 @@ EXPORT_SYMBOL(lowpan_unregister_netdev);
static int __init lowpan_module_init(void)
{
int ret;
ret = lowpan_debugfs_init();
if (ret < 0)
return ret;
request_module_nowait("ipv6");
request_module_nowait("nhc_dest");
@ -69,6 +88,13 @@ static int __init lowpan_module_init(void)
return 0;
}
static void __exit lowpan_module_exit(void)
{
lowpan_debugfs_exit();
}
module_init(lowpan_module_init);
module_exit(lowpan_module_exit);
MODULE_LICENSE("GPL");

53
net/6lowpan/debugfs.c Normal file
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@ -0,0 +1,53 @@
/* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Authors:
* (C) 2015 Pengutronix, Alexander Aring <aar@pengutronix.de>
* Copyright (c) 2015 Nordic Semiconductor. All Rights Reserved.
*/
#include <net/6lowpan.h>
#include "6lowpan_i.h"
static struct dentry *lowpan_debugfs;
int lowpan_dev_debugfs_init(struct net_device *dev)
{
struct lowpan_priv *lpriv = lowpan_priv(dev);
/* creating the root */
lpriv->iface_debugfs = debugfs_create_dir(dev->name, lowpan_debugfs);
if (!lpriv->iface_debugfs)
goto fail;
return 0;
fail:
return -EINVAL;
}
void lowpan_dev_debugfs_exit(struct net_device *dev)
{
debugfs_remove_recursive(lowpan_priv(dev)->iface_debugfs);
}
int __init lowpan_debugfs_init(void)
{
lowpan_debugfs = debugfs_create_dir("6lowpan", NULL);
if (!lowpan_debugfs)
return -EINVAL;
return 0;
}
void lowpan_debugfs_exit(void)
{
debugfs_remove_recursive(lowpan_debugfs);
}