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Message-ID: <45FFD3CF.2010409@bx.jp.nec.com>
Date: Tue, 20 Mar 2007 21:30:07 +0900
From: Keiichi KII <k-keiichi@...jp.nec.com>
To: mpm@...enic.com
CC: linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [RFC][PATCH -mm take3 4/6][resend] using symlink for the net_device
From: Keiichi KII <k-keiichi@...jp.nec.com>
We use symbolic link for net_device.
The link in sysfs represents the corresponding network etherdevice.
-+- /sys/class/misc/
|-+- netconsole/
|-+- port1/
| |--- id [r--r--r--] id
| |--- net:<net_dev> [rw-r--r--] net_dev: eth0,eth1,...
| ...
|--- port2/
...
Signed-off-by: Keiichi KII <k-keiichi@...jp.nec.com>
Signed-off-by: Takayoshi Kochi <t-kochi@...jp.nec.com>
---
Index: linux-mm/drivers/net/netconsole.c
===================================================================
--- linux-mm.orig/drivers/net/netconsole.c
+++ linux-mm/drivers/net/netconsole.c
@@ -77,6 +77,9 @@ static int add_target(char* target_confi
static int setup_target_sysfs(struct netconsole_target *nt);
static void cleanup_netconsole(void);
static void delete_target(struct netconsole_target *nt);
+static char* make_netdev_class_name(char *netdev_name);
+static int netconsole_event(struct notifier_block *this, unsigned long event,
+ void *ptr);
static int miscdev_configured;
@@ -275,6 +278,10 @@ static struct netpoll np = {
.remote_mac = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
};
+static struct notifier_block netconsole_notifier = {
+ .notifier_call = netconsole_event,
+};
+
static int add_target(char* target_config)
{
int retval = 0;
@@ -322,10 +329,20 @@ static int add_target(char* target_confi
static int setup_target_sysfs(struct netconsole_target *nt)
{
+ int retval = 0;
+ char *name;
+
kobject_set_name(&nt->obj, "port%d", nt->id);
nt->obj.parent = &netconsole_miscdev.this_device->kobj;
nt->obj.ktype = &target_ktype;
- return kobject_register(&nt->obj);
+ retval = kobject_register(&nt->obj);
+ name = make_netdev_class_name(nt->np.dev_name);
+ if (IS_ERR(name))
+ return PTR_ERR(name);
+ retval = sysfs_create_link(&nt->obj, &nt->np.dev->dev.kobj, name);
+ kfree(name);
+
+ return retval;
}
static void delete_target(struct netconsole_target *nt)
@@ -337,6 +354,57 @@ static void delete_target(struct netcons
kfree(nt);
}
+static char* make_netdev_class_name(char *netdev_name)
+{
+ int size;
+ char *name;
+ char *netdev_class_prefix = "net:";
+
+ size = strlen(netdev_class_prefix) + strlen(netdev_name) + 1;
+ name = kmalloc(size, GFP_KERNEL);
+ if (!name) {
+ printk(KERN_ERR "netconsole: kmalloc() failed!\n");
+ return ERR_PTR(-ENOMEM);
+ }
+ strcpy(name, netdev_class_prefix);
+ strcat(name, netdev_name);
+
+ return name;
+}
+
+static int netconsole_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ int error = 0;
+ char *old_link_name = NULL, *new_link_name = NULL;
+ struct netconsole_target *nt;
+ struct net_device *dev = ptr;
+
+ if (event == NETDEV_CHANGENAME) {
+ spin_lock(&target_list_lock);
+ list_for_each_entry(nt, &target_list, list) {
+ if (nt->np.dev != dev)
+ continue;
+ new_link_name = make_netdev_class_name(dev->name);
+ old_link_name =
+ make_netdev_class_name(nt->np.dev_name);
+ sysfs_remove_link(&nt->obj, old_link_name);
+ error = sysfs_create_link(&nt->obj,
+ &nt->np.dev->dev.kobj,
+ new_link_name);
+ if (error)
+ printk(KERN_ERR "can't create link: %s\n",
+ new_link_name);
+ strcpy(nt->np.dev_name, dev->name);
+ kfree(new_link_name);
+ kfree(old_link_name);
+ }
+ spin_unlock(&target_list_lock);
+ }
+
+ return NOTIFY_DONE;
+}
+
static void write_msg(struct console *con, const char *msg, unsigned int len)
{
int frag, left;
@@ -393,6 +461,7 @@ static int __init init_netconsole(void)
miscdev_configured = 1;
register_console(&netconsole);
+ register_netdevice_notifier(&netconsole_notifier);
if(!strlen(config)) {
printk(KERN_ERR "netconsole: not configured\n");
@@ -416,6 +485,7 @@ static void cleanup_netconsole(void)
struct netconsole_target *nt, *tmp;
unregister_console(&netconsole);
+ unregister_netdevice_notifier(&netconsole_notifier);
list_for_each_entry_safe(nt, tmp, &target_list, list) {
kobject_unregister(&nt->obj);
}
--
-
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