Return-Path: From: Alexander Aring To: linux-wpan@vger.kernel.org Cc: linux-bluetooth@vger.kernel.org, kernel@pengutronix.de, mcr@sandelman.ca, lukasz.duda@nordicsemi.no, martin.gergeleit@hs-rm.de, Alexander Aring Subject: [RFC bluetooth-next 1/4] 6lowpan: add debugfs support Date: Wed, 11 Nov 2015 18:14:36 +0100 Message-Id: <1447262079-2509-2-git-send-email-alex.aring@gmail.com> In-Reply-To: <1447262079-2509-1-git-send-email-alex.aring@gmail.com> References: <1447262079-2509-1-git-send-email-alex.aring@gmail.com> Sender: linux-wpan-owner@vger.kernel.org List-ID: 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. Signed-off-by: Alexander Aring --- include/net/6lowpan.h | 2 +- net/6lowpan/6lowpan_i.h | 25 +++++++++++++++++++++ net/6lowpan/Kconfig | 7 ++++++ net/6lowpan/Makefile | 1 + net/6lowpan/core.c | 19 +++++++++++++++- net/6lowpan/debugfs.c | 51 +++++++++++++++++++++++++++++++++++++++++++ net/bluetooth/6lowpan.c | 17 +++++++++------ net/ieee802154/6lowpan/core.c | 14 +++++++----- 8 files changed, 122 insertions(+), 14 deletions(-) create mode 100644 net/6lowpan/6lowpan_i.h create mode 100644 net/6lowpan/debugfs.c diff --git a/include/net/6lowpan.h b/include/net/6lowpan.h index cf3bc56..edce9a1 100644 --- a/include/net/6lowpan.h +++ b/include/net/6lowpan.h @@ -185,7 +185,7 @@ static inline void lowpan_push_hc_data(u8 **hc_ptr, const void *data, *hc_ptr += len; } -void lowpan_netdev_setup(struct net_device *dev, enum lowpan_lltypes lltype); +int lowpan_netdev_setup(struct net_device *dev, enum lowpan_lltypes lltype); /** * lowpan_header_decompress - replace 6LoWPAN header with IPv6 header diff --git a/net/6lowpan/6lowpan_i.h b/net/6lowpan/6lowpan_i.h new file mode 100644 index 0000000..102c2a4 --- /dev/null +++ b/net/6lowpan/6lowpan_i.h @@ -0,0 +1,25 @@ +#ifndef __6LOWPAN_I_H +#define __6LOWPAN_I_H + +#include + +#ifdef CONFIG_6LOWPAN_DEBUGFS +int lowpan_dev_debugfs_init(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 int __init lowpan_debugfs_init(void) +{ + return 0; +} + +static inline void lowpan_debugfs_exit(void) { } +#endif /* CONFIG_6LOWPAN_DEBUGFS */ + +#endif /* __6LOWPAN_I_H */ diff --git a/net/6lowpan/Kconfig b/net/6lowpan/Kconfig index 7fa0f38..01c901c 100644 --- a/net/6lowpan/Kconfig +++ b/net/6lowpan/Kconfig @@ -5,6 +5,13 @@ 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 + ---help--- + This enables 6LoWPAN debugfs support. For example to manipulate + IPHC context information at runtime. + menuconfig 6LOWPAN_NHC tristate "Next Header Compression Support" depends on 6LOWPAN diff --git a/net/6lowpan/Makefile b/net/6lowpan/Makefile index c6ffc55..54cad8d 100644 --- a/net/6lowpan/Makefile +++ b/net/6lowpan/Makefile @@ -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 diff --git a/net/6lowpan/core.c b/net/6lowpan/core.c index 83b19e0..7f46c7e 100644 --- a/net/6lowpan/core.c +++ b/net/6lowpan/core.c @@ -15,7 +15,9 @@ #include -void lowpan_netdev_setup(struct net_device *dev, enum lowpan_lltypes lltype) +#include "6lowpan_i.h" + +int lowpan_netdev_setup(struct net_device *dev, enum lowpan_lltypes lltype) { dev->addr_len = EUI64_ADDR_LEN; dev->type = ARPHRD_6LOWPAN; @@ -23,11 +25,19 @@ void lowpan_netdev_setup(struct net_device *dev, enum lowpan_lltypes lltype) dev->priv_flags |= IFF_NO_QUEUE; lowpan_priv(dev)->lltype = lltype; + + return lowpan_dev_debugfs_init(dev); } EXPORT_SYMBOL(lowpan_netdev_setup); 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"); @@ -40,6 +50,13 @@ 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"); diff --git a/net/6lowpan/debugfs.c b/net/6lowpan/debugfs.c new file mode 100644 index 0000000..e70eee4 --- /dev/null +++ b/net/6lowpan/debugfs.c @@ -0,0 +1,51 @@ +/* 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 + * Copyright (c) 2015 Nordic Semiconductor. All Rights Reserved. + */ + +#include + +#include + +#include "6lowpan_i.h" + +static struct dentry *lowpan_debugfs; + +int lowpan_dev_debugfs_init(struct net_device *dev) +{ + static struct dentry *iface; + + /* creating the root */ + iface = debugfs_create_dir(dev->name, lowpan_debugfs); + if (!iface) + goto fail; + + return 0; + +fail: + lowpan_debugfs_exit(); + return -EINVAL; +} + +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); +} diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c index 9e9cca3..57aa5ff 100644 --- a/net/bluetooth/6lowpan.c +++ b/net/bluetooth/6lowpan.c @@ -825,16 +825,14 @@ static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev) list_add_rcu(&(*dev)->list, &bt_6lowpan_devices); spin_unlock(&devices_lock); - lowpan_netdev_setup(netdev, LOWPAN_LLTYPE_BTLE); + err = lowpan_netdev_setup(netdev, LOWPAN_LLTYPE_BTLE); + if (err < 0) + goto free_netdev; err = register_netdev(netdev); if (err < 0) { BT_INFO("register_netdev failed %d", err); - spin_lock(&devices_lock); - list_del_rcu(&(*dev)->list); - spin_unlock(&devices_lock); - free_netdev(netdev); - goto out; + goto free_netdev; } BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d", @@ -844,7 +842,12 @@ static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev) return 0; -out: +free_netdev: + spin_lock(&devices_lock); + list_del_rcu(&(*dev)->list); + spin_unlock(&devices_lock); + free_netdev(netdev); + return err; } diff --git a/net/ieee802154/6lowpan/core.c b/net/ieee802154/6lowpan/core.c index 20c49c7..67ed7dc 100644 --- a/net/ieee802154/6lowpan/core.c +++ b/net/ieee802154/6lowpan/core.c @@ -161,16 +161,20 @@ static int lowpan_newlink(struct net *src_net, struct net_device *ldev, wdev->needed_headroom; ldev->needed_tailroom = wdev->needed_tailroom; - lowpan_netdev_setup(ldev, LOWPAN_LLTYPE_IEEE802154); + ret = lowpan_netdev_setup(ldev, LOWPAN_LLTYPE_IEEE802154); + if (ret < 0) + goto dev_put; ret = register_netdevice(ldev); - if (ret < 0) { - dev_put(wdev); - return ret; - } + if (ret < 0) + goto dev_put; wdev->ieee802154_ptr->lowpan_dev = ldev; return 0; + +dev_put: + dev_put(wdev); + return ret; } static void lowpan_dellink(struct net_device *ldev, struct list_head *head) -- 2.6.1