Hello.
On 17/11/15 23:33, Alexander Aring wrote:
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.
This will be useful for other things as well later on. Some small
remarks below.
Signed-off-by: Alexander Aring<alex.aring@xxxxxxxxx>
---
include/net/6lowpan.h | 6 ++++-
net/6lowpan/6lowpan_i.h | 28 ++++++++++++++++++++++
net/6lowpan/Kconfig | 7 ++++++
net/6lowpan/Makefile | 1 +
net/6lowpan/core.c | 25 +++++++++++++++++++-
net/6lowpan/debugfs.c | 54 +++++++++++++++++++++++++++++++++++++++++++
net/bluetooth/6lowpan.c | 21 +++++++++++------
net/ieee802154/6lowpan/core.c | 18 +++++++++++----
8 files changed, 146 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..e484898 100644
--- a/include/net/6lowpan.h
+++ b/include/net/6lowpan.h
@@ -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 *));
@@ -185,7 +188,8 @@ 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);
+void lowpan_netdev_unsetup(struct net_device *dev);
Unsetup sounds really wrong. Can we call it teardown? Especially as we
export this symbol.
/**
* 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..33b2605
--- /dev/null
+++ b/net/6lowpan/6lowpan_i.h
@@ -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_uninit(struct net_device *dev);
Exit instead of uninit?
+
+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;
+}
+
+void lowpan_dev_debugfs_uninit(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 */
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..fe58509 100644
--- a/net/6lowpan/core.c
+++ b/net/6lowpan/core.c
@@ -15,7 +15,9 @@
#include <net/6lowpan.h>
-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 +25,25 @@ 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);
+void lowpan_netdev_unsetup(struct net_device *dev)
+{
+ lowpan_dev_debugfs_uninit(dev);
+}
+EXPORT_SYMBOL(lowpan_netdev_unsetup);
+
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 +56,13 @@ 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..b0a26fd
--- /dev/null
+++ b/net/6lowpan/debugfs.c
@@ -0,0 +1,54 @@
+/* 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@xxxxxxxxxxxxxx>
+ * 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:
+ lowpan_dev_debugfs_uninit(dev);
+ return -EINVAL;
+}
+
+void lowpan_dev_debugfs_uninit(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);
+}
diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index 9e9cca3..d10ce57 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 unsetup_lowpan;
Again teardown, please.
}
BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
@@ -844,7 +842,15 @@ static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev)
return 0;
-out:
+unsetup_lowpan:
+ lowpan_netdev_unsetup(netdev);
+
+free_netdev:
+ spin_lock(&devices_lock);
+ list_del_rcu(&(*dev)->list);
+ spin_unlock(&devices_lock);
+ free_netdev(netdev);
+
return err;
}
@@ -1348,6 +1354,7 @@ static void disconnect_devices(void)
ifdown(entry->netdev);
BT_DBG("Unregistering netdev %s %p",
entry->netdev->name, entry->netdev);
+ lowpan_netdev_unsetup(entry->netdev);
unregister_netdev(entry->netdev);
kfree(entry);
}
diff --git a/net/ieee802154/6lowpan/core.c b/net/ieee802154/6lowpan/core.c
index 20c49c7..3b42a75 100644
--- a/net/ieee802154/6lowpan/core.c
+++ b/net/ieee802154/6lowpan/core.c
@@ -161,16 +161,23 @@ 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 unsetup_lowpan;
Teardown
wdev->ieee802154_ptr->lowpan_dev = ldev;
return 0;
+
+unsetup_lowpan:
+ lowpan_netdev_unsetup(ldev);
+
+dev_put:
+ dev_put(wdev);
+ return ret;
}
static void lowpan_dellink(struct net_device *ldev, struct list_head *head)
@@ -180,6 +187,7 @@ static void lowpan_dellink(struct net_device *ldev, struct list_head *head)
ASSERT_RTNL();
wdev->ieee802154_ptr->lowpan_dev = NULL;
+ lowpan_netdev_unsetup(ldev);
unregister_netdevice(ldev);
dev_put(wdev);
}
If you are going to change the th uninit to exit and the unsetup to
teardown you can add my review.
Reviewed-by: Stefan Schmidt <stefan@xxxxxxxxxxxxxxx>
regards
Stefan Schmidt
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