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Message-Id: <200708102112.l7ALC9oD009457@imap1.linux-foundation.org>
Date: Fri, 10 Aug 2007 14:12:09 -0700
From: akpm@...ux-foundation.org
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, akpm@...ux-foundation.org,
satyam@...radead.org, Joel.Becker@...cle.com,
k-keiichi@...jp.nec.com, mpm@...enic.com
Subject: [patch 26/28] netconsole: Support dynamic reconfiguration using configfs
From: Satyam Sharma <satyam@...radead.org>
Based upon initial work by Keiichi Kii <k-keiichi@...jp.nec.com>.
This patch introduces support for dynamic reconfiguration (adding, removing
and/or modifying parameters of netconsole targets at runtime) using a
userspace interface exported via configfs. Documentation is also updated
accordingly.
Issues and brief design overview:
(1) Kernel-initiated creation / destruction of kernel objects is not
possible with configfs -- the lifetimes of the "config items" is managed
exclusively from userspace. But netconsole must support boot/module
params too, and these are parsed in kernel and hence netpolls must be
setup from the kernel. Joel Becker suggested to separately manage the
lifetimes of the two kinds of netconsole_target objects -- those created
via configfs mkdir(2) from userspace and those specified from the
boot/module option string. This adds complexity and some redundancy here
and also means that boot/module param-created targets are not exposed
through the configfs namespace (and hence cannot be updated / destroyed
dynamically). However, this saves us from locking / refcounting
complexities that would need to be introduced in configfs to support
kernel-initiated item creation / destroy there.
(2) In configfs, item creation takes place in the call chain of the
mkdir(2) syscall in the driver subsystem. If we used an ioctl(2) to
create / destroy objects from userspace, the special userspace program is
able to fill out the structure to be passed into the ioctl and hence
specify attributes such as local interface that are required at the time
we set up the netpoll. For configfs, this information is not available at
the time of mkdir(2). So, we keep all newly-created targets (via
configfs) disabled by default. The user is expected to set various
attributes appropriately (including the local network interface if
required) and then write(2) "1" to the "enabled" attribute. Thus,
netpoll_setup() is then called on the set parameters in the context of
_this_ write(2) on the "enabled" attribute itself. This design enables
the user to reconfigure existing netconsole targets at runtime to be
attached to newly-come-up interfaces that may not have existed when
netconsole was loaded or when the targets were actually created. All this
effectively enables us to get rid of custom ioctls.
(3) Ultra-paranoid configfs attribute show() and store() operations, with
sanity and input range checking, using only safe string primitives, and
compliant with the recommendations in Documentation/filesystems/sysfs.txt.
(4) A new function netpoll_print_options() is created in the netpoll API,
that just prints out the configured parameters for a netpoll structure.
netpoll_parse_options() is modified to use that and it is also exported to
be used from netconsole.
Signed-off-by: Satyam Sharma <satyam@...radead.org>
Acked-by: Keiichi Kii <k-keiichi@...jp.nec.com>
Cc: Matt Mackall <mpm@...enic.com>
Cc: Joel Becker <Joel.Becker@...cle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
Documentation/networking/netconsole.txt | 68 ++
drivers/net/Kconfig | 10
drivers/net/netconsole.c | 605 +++++++++++++++++++++-
include/linux/netpoll.h | 1
net/core/netpoll.c | 44 -
5 files changed, 683 insertions(+), 45 deletions(-)
diff -puN Documentation/networking/netconsole.txt~netconsole-support-dynamic-reconfiguration-using-configfs Documentation/networking/netconsole.txt
--- a/Documentation/networking/netconsole.txt~netconsole-support-dynamic-reconfiguration-using-configfs
+++ a/Documentation/networking/netconsole.txt
@@ -3,6 +3,10 @@ started by Ingo Molnar <mingo@...hat.com
2.6 port and netpoll api by Matt Mackall <mpm@...enic.com>, Sep 9 2003
Please send bug reports to Matt Mackall <mpm@...enic.com>
+and Satyam Sharma <satyam.sharma@...il.com>
+
+Introduction:
+=============
This module logs kernel printk messages over UDP allowing debugging of
problem where disk logging fails and serial consoles are impractical.
@@ -13,6 +17,9 @@ the specified interface as soon as possi
capture of early kernel panics, it does capture most of the boot
process.
+Sender and receiver configuration:
+==================================
+
It takes a string configuration parameter "netconsole" in the
following format:
@@ -46,6 +53,67 @@ address.
The remote host can run either 'netcat -u -l -p <port>' or syslogd.
+Dynamic reconfiguration:
+========================
+
+Dynamic reconfigurability is a useful addition to netconsole that enables
+remote logging targets to be dynamically added, removed, or have their
+parameters reconfigured at runtime from a configfs-based userspace interface.
+[ Note that the parameters of netconsole targets that were specified/created
+from the boot/module option are not exposed via this interface, and hence
+cannot be modified dynamically. ]
+
+To include this feature, select CONFIG_NETCONSOLE_DYNAMIC when building the
+netconsole module (or kernel, if netconsole is built-in).
+
+Some examples follow (where configfs is mounted at the /sys/kernel/config
+mountpoint).
+
+To add a remote logging target (target names can be arbitrary):
+
+ cd /sys/kernel/config/netconsole/
+ mkdir target1
+
+Note that newly created targets have default parameter values (as mentioned
+above) and are disabled by default -- they must first be enabled by writing
+"1" to the "enabled" attribute (usually after setting parameters accordingly)
+as described below.
+
+To remove a target:
+
+ rmdir /sys/kernel/config/netconsole/othertarget/
+
+The interface exposes these parameters of a netconsole target to userspace:
+
+ enabled Is this target currently enabled? (read-write)
+ dev_name Local network interface name (read-write)
+ local_port Source UDP port to use (read-write)
+ remote_port Remote agent's UDP port (read-write)
+ local_ip Source IP address to use (read-write)
+ remote_ip Remote agent's IP address (read-write)
+ local_mac Local interface's MAC address (read-only)
+ remote_mac Remote agent's MAC address (read-write)
+
+The "enabled" attribute is also used to control whether the parameters of
+a target can be updated or not -- you can modify the parameters of only
+disabled targets (i.e. if "enabled" is 0).
+
+To update a target's parameters:
+
+ cat enabled # check if enabled is 1
+ echo 0 > enabled # disable the target (if required)
+ echo eth2 > dev_name # set local interface
+ echo 10.0.0.4 > remote_ip # update some parameter
+ echo cb:a9:87:65:43:21 > remote_mac # update more parameters
+ echo 1 > enabled # enable target again
+
+You can also update the local interface dynamically. This is especially
+useful if you want to use interfaces that have newly come up (and may not
+have existed when netconsole was loaded / initialized).
+
+Miscellaneous notes:
+====================
+
WARNING: the default target ethernet setting uses the broadcast
ethernet address to send packets, which can cause increased load on
other systems on the same ethernet segment.
diff -puN drivers/net/Kconfig~netconsole-support-dynamic-reconfiguration-using-configfs drivers/net/Kconfig
--- a/drivers/net/Kconfig~netconsole-support-dynamic-reconfiguration-using-configfs
+++ a/drivers/net/Kconfig
@@ -3021,6 +3021,16 @@ config NETCONSOLE
If you want to log kernel messages over the network, enable this.
See <file:Documentation/networking/netconsole.txt> for details.
+config NETCONSOLE_DYNAMIC
+ bool "Dynamic reconfiguration of logging targets (EXPERIMENTAL)"
+ depends on NETCONSOLE && SYSFS && EXPERIMENTAL
+ select CONFIGFS_FS
+ help
+ This option enables the ability to dynamically reconfigure target
+ parameters (interface, IP addresses, port numbers, MAC addresses)
+ at runtime through a userspace interface exported using configfs.
+ See <file:Documentation/networking/netconsole.txt> for details.
+
config NETPOLL
def_bool NETCONSOLE
diff -puN drivers/net/netconsole.c~netconsole-support-dynamic-reconfiguration-using-configfs drivers/net/netconsole.c
--- a/drivers/net/netconsole.c~netconsole-support-dynamic-reconfiguration-using-configfs
+++ a/drivers/net/netconsole.c
@@ -41,6 +41,8 @@
#include <linux/moduleparam.h>
#include <linux/string.h>
#include <linux/netpoll.h>
+#include <linux/inet.h>
+#include <linux/configfs.h>
MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@...enic.com>");
MODULE_DESCRIPTION("Console driver for network interfaces");
@@ -71,20 +73,100 @@ static DEFINE_SPINLOCK(target_list_lock)
/**
* struct netconsole_target - Represents a configured netconsole target.
* @list: Links this target into the target_list.
+ * @item: Links us into the configfs subsystem hierarchy.
+ * @enabled: On / off knob to enable / disable target.
+ * Visible from userspace (read-write).
+ * We maintain a strict 1:1 correspondence between this and
+ * whether the corresponding netpoll is active or inactive.
+ * Also, other parameters of a target may be modified at
+ * runtime only when it is disabled (enabled == 0).
* @np: The netpoll structure for this target.
+ * Contains the other userspace visible parameters:
+ * dev_name (read-write)
+ * local_port (read-write)
+ * remote_port (read-write)
+ * local_ip (read-write)
+ * remote_ip (read-write)
+ * local_mac (read-only)
+ * remote_mac (read-write)
*/
struct netconsole_target {
struct list_head list;
+#ifdef CONFIG_NETCONSOLE_DYNAMIC
+ struct config_item item;
+#endif
+ int enabled;
struct netpoll np;
};
-/* Allocate new target and setup netpoll for it */
-static struct netconsole_target *alloc_target(char *target_config)
+#ifdef CONFIG_NETCONSOLE_DYNAMIC
+
+static struct configfs_subsystem netconsole_subsys;
+
+static int __init dynamic_netconsole_init(void)
+{
+ config_group_init(&netconsole_subsys.su_group);
+ mutex_init(&netconsole_subsys.su_mutex);
+ return configfs_register_subsystem(&netconsole_subsys);
+}
+
+static void __exit dynamic_netconsole_exit(void)
+{
+ configfs_unregister_subsystem(&netconsole_subsys);
+}
+
+/*
+ * Targets that were created by parsing the boot/module option string
+ * do not exist in the configfs hierarchy (and have NULL names) and will
+ * never go away, so make these a no-op for them.
+ */
+static void netconsole_target_get(struct netconsole_target *nt)
+{
+ if (config_item_name(&nt->item))
+ config_item_get(&nt->item);
+}
+
+static void netconsole_target_put(struct netconsole_target *nt)
+{
+ if (config_item_name(&nt->item))
+ config_item_put(&nt->item);
+}
+
+#else /* !CONFIG_NETCONSOLE_DYNAMIC */
+
+static int __init dynamic_netconsole_init(void)
+{
+ return 0;
+}
+
+static void __exit dynamic_netconsole_exit(void)
+{
+}
+
+/*
+ * No danger of targets going away from under us when dynamic
+ * reconfigurability is off.
+ */
+static void netconsole_target_get(struct netconsole_target *nt)
+{
+}
+
+static void netconsole_target_put(struct netconsole_target *nt)
+{
+}
+
+#endif /* CONFIG_NETCONSOLE_DYNAMIC */
+
+/* Allocate new target (from boot/module param) and setup netpoll for it */
+static struct netconsole_target *alloc_param_target(char *target_config)
{
int err = -ENOMEM;
struct netconsole_target *nt;
- /* Allocate and initialize with defaults */
+ /*
+ * Allocate and initialize with defaults.
+ * Note that these targets get their config_item fields zeroed-out.
+ */
nt = kzalloc(sizeof(*nt), GFP_KERNEL);
if (!nt) {
printk(KERN_ERR "netconsole: failed to allocate memory\n");
@@ -106,6 +188,8 @@ static struct netconsole_target *alloc_t
if (err)
goto fail;
+ nt->enabled = 1;
+
return nt;
fail:
@@ -113,13 +197,469 @@ fail:
return ERR_PTR(err);
}
-/* Cleanup netpoll for given target and free it */
-static void free_target(struct netconsole_target *nt)
+/* Cleanup netpoll for given target (from boot/module param) and free it */
+static void free_param_target(struct netconsole_target *nt)
{
netpoll_cleanup(&nt->np);
kfree(nt);
}
+#ifdef CONFIG_NETCONSOLE_DYNAMIC
+
+/*
+ * Our subsystem hierarchy is:
+ *
+ * /sys/kernel/config/netconsole/
+ * |
+ * <target>/
+ * | enabled
+ * | dev_name
+ * | local_port
+ * | remote_port
+ * | local_ip
+ * | remote_ip
+ * | local_mac
+ * | remote_mac
+ * |
+ * <target>/...
+ */
+
+struct netconsole_target_attr {
+ struct configfs_attribute attr;
+ ssize_t (*show)(struct netconsole_target *nt,
+ char *buf);
+ ssize_t (*store)(struct netconsole_target *nt,
+ const char *buf,
+ size_t count);
+};
+
+static struct netconsole_target *to_target(struct config_item *item)
+{
+ return item ?
+ container_of(item, struct netconsole_target, item) :
+ NULL;
+}
+
+/*
+ * Wrapper over simple_strtol (base 10) with sanity and range checking.
+ * We return (signed) long only because we may want to return errors.
+ * Do not use this to convert numbers that are allowed to be negative.
+ */
+static long strtol10_check_range(const char *cp, long min, long max)
+{
+ long ret;
+ char *p = (char *) cp;
+
+ WARN_ON(min < 0);
+ WARN_ON(max < min);
+
+ ret = simple_strtol(p, &p, 10);
+
+ if (*p && (*p != '\n')) {
+ printk(KERN_ERR "netconsole: invalid input\n");
+ return -EINVAL;
+ }
+ if ((ret < min) || (ret > max)) {
+ printk(KERN_ERR "netconsole: input %ld must be between "
+ "%ld and %ld\n", ret, min, max);
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+/*
+ * Attribute operations for netconsole_target.
+ */
+
+static ssize_t show_enabled(struct netconsole_target *nt, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", nt->enabled);
+}
+
+static ssize_t show_dev_name(struct netconsole_target *nt, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%s\n", nt->np.dev_name);
+}
+
+static ssize_t show_local_port(struct netconsole_target *nt, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.local_port);
+}
+
+static ssize_t show_remote_port(struct netconsole_target *nt, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.remote_port);
+}
+
+static ssize_t show_local_ip(struct netconsole_target *nt, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d.%d.%d.%d\n",
+ HIPQUAD(nt->np.local_ip));
+}
+
+static ssize_t show_remote_ip(struct netconsole_target *nt, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d.%d.%d.%d\n",
+ HIPQUAD(nt->np.remote_ip));
+}
+
+static ssize_t show_local_mac(struct netconsole_target *nt, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%02x:%02x:%02x:%02x:%02x:%02x\n",
+ nt->np.local_mac[0], nt->np.local_mac[1],
+ nt->np.local_mac[2], nt->np.local_mac[3],
+ nt->np.local_mac[4], nt->np.local_mac[5]);
+}
+
+static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%02x:%02x:%02x:%02x:%02x:%02x\n",
+ nt->np.remote_mac[0], nt->np.remote_mac[1],
+ nt->np.remote_mac[2], nt->np.remote_mac[3],
+ nt->np.remote_mac[4], nt->np.remote_mac[5]);
+}
+
+/*
+ * This one is special -- targets created through the configfs interface
+ * are not enabled (and the corresponding netpoll activated) by default.
+ * The user is expected to set the desired parameters first (which
+ * would enable him to dynamically add new netpoll targets for new
+ * network interfaces as and when they come up).
+ */
+static ssize_t store_enabled(struct netconsole_target *nt,
+ const char *buf,
+ size_t count)
+{
+ int err;
+ long enabled;
+
+ enabled = strtol10_check_range(buf, 0, 1);
+ if (enabled < 0)
+ return enabled;
+
+ if (enabled) { /* 1 */
+
+ /*
+ * Skip netpoll_parse_options() -- all the attributes are
+ * already configured via configfs. Just print them out.
+ */
+ netpoll_print_options(&nt->np);
+
+ err = netpoll_setup(&nt->np);
+ if (err)
+ return err;
+
+ printk(KERN_INFO "netconsole: network logging started\n");
+
+ } else { /* 0 */
+ netpoll_cleanup(&nt->np);
+ }
+
+ nt->enabled = enabled;
+
+ return strnlen(buf, count);
+}
+
+static ssize_t store_dev_name(struct netconsole_target *nt,
+ const char *buf,
+ size_t count)
+{
+ size_t len;
+
+ if (nt->enabled) {
+ printk(KERN_ERR "netconsole: target (%s) is enabled, "
+ "disable to update parameters\n",
+ config_item_name(&nt->item));
+ return -EINVAL;
+ }
+
+ strlcpy(nt->np.dev_name, buf, IFNAMSIZ);
+
+ /* Get rid of possible trailing newline from echo(1) */
+ len = strnlen(nt->np.dev_name, IFNAMSIZ);
+ if (nt->np.dev_name[len - 1] == '\n')
+ nt->np.dev_name[len - 1] = '\0';
+
+ return strnlen(buf, count);
+}
+
+static ssize_t store_local_port(struct netconsole_target *nt,
+ const char *buf,
+ size_t count)
+{
+ long local_port;
+#define __U16_MAX ((__u16) ~0U)
+
+ if (nt->enabled) {
+ printk(KERN_ERR "netconsole: target (%s) is enabled, "
+ "disable to update parameters\n",
+ config_item_name(&nt->item));
+ return -EINVAL;
+ }
+
+ local_port = strtol10_check_range(buf, 0, __U16_MAX);
+ if (local_port < 0)
+ return local_port;
+
+ nt->np.local_port = local_port;
+
+ return strnlen(buf, count);
+}
+
+static ssize_t store_remote_port(struct netconsole_target *nt,
+ const char *buf,
+ size_t count)
+{
+ long remote_port;
+#define __U16_MAX ((__u16) ~0U)
+
+ if (nt->enabled) {
+ printk(KERN_ERR "netconsole: target (%s) is enabled, "
+ "disable to update parameters\n",
+ config_item_name(&nt->item));
+ return -EINVAL;
+ }
+
+ remote_port = strtol10_check_range(buf, 0, __U16_MAX);
+ if (remote_port < 0)
+ return remote_port;
+
+ nt->np.remote_port = remote_port;
+
+ return strnlen(buf, count);
+}
+
+static ssize_t store_local_ip(struct netconsole_target *nt,
+ const char *buf,
+ size_t count)
+{
+ if (nt->enabled) {
+ printk(KERN_ERR "netconsole: target (%s) is enabled, "
+ "disable to update parameters\n",
+ config_item_name(&nt->item));
+ return -EINVAL;
+ }
+
+ nt->np.local_ip = ntohl(in_aton(buf));
+
+ return strnlen(buf, count);
+}
+
+static ssize_t store_remote_ip(struct netconsole_target *nt,
+ const char *buf,
+ size_t count)
+{
+ if (nt->enabled) {
+ printk(KERN_ERR "netconsole: target (%s) is enabled, "
+ "disable to update parameters\n",
+ config_item_name(&nt->item));
+ return -EINVAL;
+ }
+
+ nt->np.remote_ip = ntohl(in_aton(buf));
+
+ return strnlen(buf, count);
+}
+
+static ssize_t store_remote_mac(struct netconsole_target *nt,
+ const char *buf,
+ size_t count)
+{
+ u8 remote_mac[ETH_ALEN];
+ char *p = (char *) buf;
+ int i;
+
+ if (nt->enabled) {
+ printk(KERN_ERR "netconsole: target (%s) is enabled, "
+ "disable to update parameters\n",
+ config_item_name(&nt->item));
+ return -EINVAL;
+ }
+
+ for (i = 0; i < ETH_ALEN - 1; i++) {
+ remote_mac[i] = simple_strtoul(p, &p, 16);
+ if (*p != ':')
+ goto invalid;
+ p++;
+ }
+ remote_mac[ETH_ALEN - 1] = simple_strtoul(p, &p, 16);
+ if (*p && (*p != '\n'))
+ goto invalid;
+
+ memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN);
+
+ return strnlen(buf, count);
+
+invalid:
+ printk(KERN_ERR "netconsole: invalid input\n");
+ return -EINVAL;
+}
+
+/*
+ * Attribute definitions for netconsole_target.
+ */
+
+#define NETCONSOLE_TARGET_ATTR_RO(_name) \
+static struct netconsole_target_attr netconsole_target_##_name = \
+ __CONFIGFS_ATTR(_name, S_IRUGO, show_##_name, NULL)
+
+#define NETCONSOLE_TARGET_ATTR_RW(_name) \
+static struct netconsole_target_attr netconsole_target_##_name = \
+ __CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, show_##_name, store_##_name)
+
+NETCONSOLE_TARGET_ATTR_RW(enabled);
+NETCONSOLE_TARGET_ATTR_RW(dev_name);
+NETCONSOLE_TARGET_ATTR_RW(local_port);
+NETCONSOLE_TARGET_ATTR_RW(remote_port);
+NETCONSOLE_TARGET_ATTR_RW(local_ip);
+NETCONSOLE_TARGET_ATTR_RW(remote_ip);
+NETCONSOLE_TARGET_ATTR_RO(local_mac);
+NETCONSOLE_TARGET_ATTR_RW(remote_mac);
+
+static struct configfs_attribute *netconsole_target_attrs[] = {
+ &netconsole_target_enabled.attr,
+ &netconsole_target_dev_name.attr,
+ &netconsole_target_local_port.attr,
+ &netconsole_target_remote_port.attr,
+ &netconsole_target_local_ip.attr,
+ &netconsole_target_remote_ip.attr,
+ &netconsole_target_local_mac.attr,
+ &netconsole_target_remote_mac.attr,
+ NULL,
+};
+
+/*
+ * Item operations and type for netconsole_target.
+ */
+
+static void netconsole_target_release(struct config_item *item)
+{
+ kfree(to_target(item));
+}
+
+static ssize_t netconsole_target_attr_show(struct config_item *item,
+ struct configfs_attribute *attr,
+ char *buf)
+{
+ ssize_t ret = -EINVAL;
+ struct netconsole_target *nt = to_target(item);
+ struct netconsole_target_attr *na =
+ container_of(attr, struct netconsole_target_attr, attr);
+
+ if (na->show)
+ ret = na->show(nt, buf);
+
+ return ret;
+}
+
+static ssize_t netconsole_target_attr_store(struct config_item *item,
+ struct configfs_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ ssize_t ret = -EINVAL;
+ struct netconsole_target *nt = to_target(item);
+ struct netconsole_target_attr *na =
+ container_of(attr, struct netconsole_target_attr, attr);
+
+ if (na->store)
+ ret = na->store(nt, buf, count);
+
+ return ret;
+}
+
+static struct configfs_item_operations netconsole_target_item_ops = {
+ .release = netconsole_target_release,
+ .show_attribute = netconsole_target_attr_show,
+ .store_attribute = netconsole_target_attr_store,
+};
+
+static struct config_item_type netconsole_target_type = {
+ .ct_attrs = netconsole_target_attrs,
+ .ct_item_ops = &netconsole_target_item_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+/*
+ * Group operations and type for netconsole_subsys.
+ */
+
+static struct config_item *make_netconsole_target(struct config_group *group,
+ const char *name)
+{
+ unsigned long flags;
+ struct netconsole_target *nt;
+
+ /*
+ * Allocate and initialize with defaults.
+ * Target is disabled at creation (enabled == 0).
+ */
+ nt = kzalloc(sizeof(*nt), GFP_KERNEL);
+ if (!nt) {
+ printk(KERN_ERR "netconsole: failed to allocate memory\n");
+ return NULL;
+ }
+
+ nt->np.name = "netconsole";
+ strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ);
+ nt->np.local_port = 6665;
+ nt->np.remote_port = 6666;
+ memset(nt->np.remote_mac, 0xff, ETH_ALEN);
+
+ /* Initialize the config_item member */
+ config_item_init_type_name(&nt->item, name, &netconsole_target_type);
+
+ /* Adding, but it is disabled */
+ spin_lock_irqsave(&target_list_lock, flags);
+ list_add(&nt->list, &target_list);
+ spin_unlock_irqrestore(&target_list_lock, flags);
+
+ return &nt->item;
+}
+
+static void drop_netconsole_target(struct config_group *group,
+ struct config_item *item)
+{
+ unsigned long flags;
+ struct netconsole_target *nt = to_target(item);
+
+ spin_lock_irqsave(&target_list_lock, flags);
+ list_del(&nt->list);
+ spin_unlock_irqrestore(&target_list_lock, flags);
+
+ /*
+ * The target may have never been enabled, or was manually disabled
+ * before being removed so netpoll may have already been cleaned up.
+ */
+ if (nt->enabled)
+ netpoll_cleanup(&nt->np);
+
+ config_item_put(&nt->item);
+}
+
+static struct configfs_group_operations netconsole_subsys_group_ops = {
+ .make_item = make_netconsole_target,
+ .drop_item = drop_netconsole_target,
+};
+
+static struct config_item_type netconsole_subsys_type = {
+ .ct_group_ops = &netconsole_subsys_group_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+/* The netconsole configfs subsystem */
+static struct configfs_subsystem netconsole_subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "netconsole",
+ .ci_type = &netconsole_subsys_type,
+ },
+ },
+};
+
+#endif /* CONFIG_NETCONSOLE_DYNAMIC */
+
/* Handle network interface device notifications */
static int netconsole_netdev_event(struct notifier_block *this,
unsigned long event,
@@ -134,6 +674,7 @@ static int netconsole_netdev_event(struc
spin_lock_irqsave(&target_list_lock, flags);
list_for_each_entry(nt, &target_list, list) {
+ netconsole_target_get(nt);
if (nt->np.dev == dev) {
switch (event) {
case NETDEV_CHANGEADDR:
@@ -145,6 +686,7 @@ static int netconsole_netdev_event(struc
break;
}
}
+ netconsole_target_put(nt);
}
spin_unlock_irqrestore(&target_list_lock, flags);
@@ -169,7 +711,8 @@ static void write_msg(struct console *co
spin_lock_irqsave(&target_list_lock, flags);
list_for_each_entry(nt, &target_list, list) {
- if (netif_running(nt->np.dev)) {
+ netconsole_target_get(nt);
+ if (nt->enabled && netif_running(nt->np.dev)) {
/*
* We nest this inside the for-each-target loop above
* so that we're able to get as much logging out to
@@ -184,6 +727,7 @@ static void write_msg(struct console *co
left -= frag;
}
}
+ netconsole_target_put(nt);
}
spin_unlock_irqrestore(&target_list_lock, flags);
}
@@ -196,48 +740,52 @@ static struct console netconsole = {
static int __init init_netconsole(void)
{
- int err = 0;
+ int err;
struct netconsole_target *nt, *tmp;
unsigned long flags;
char *target_config;
char *input = config;
- if (!strnlen(input, MAX_PARAM_LENGTH)) {
- printk(KERN_INFO "netconsole: not configured, aborting\n");
- goto out;
- }
-
- while ((target_config = strsep(&input, ";"))) {
- nt = alloc_target(target_config);
- if (IS_ERR(nt)) {
- err = PTR_ERR(nt);
- goto fail;
+ if (strnlen(input, MAX_PARAM_LENGTH)) {
+ while ((target_config = strsep(&input, ";"))) {
+ nt = alloc_param_target(target_config);
+ if (IS_ERR(nt)) {
+ err = PTR_ERR(nt);
+ goto fail;
+ }
+ spin_lock_irqsave(&target_list_lock, flags);
+ list_add(&nt->list, &target_list);
+ spin_unlock_irqrestore(&target_list_lock, flags);
}
- spin_lock_irqsave(&target_list_lock, flags);
- list_add(&nt->list, &target_list);
- spin_unlock_irqrestore(&target_list_lock, flags);
}
err = register_netdevice_notifier(&netconsole_netdev_notifier);
if (err)
goto fail;
+ err = dynamic_netconsole_init();
+ if (err)
+ goto undonotifier;
+
register_console(&netconsole);
printk(KERN_INFO "netconsole: network logging started\n");
-out:
return err;
+undonotifier:
+ unregister_netdevice_notifier(&netconsole_netdev_notifier);
+
fail:
printk(KERN_ERR "netconsole: cleaning up\n");
/*
- * Remove all targets and destroy them. Skipping the list
+ * Remove all targets and destroy them (only targets created
+ * from the boot/module option exist here). Skipping the list
* lock is safe here, and netpoll_cleanup() will sleep.
*/
list_for_each_entry_safe(nt, tmp, &target_list, list) {
list_del(&nt->list);
- free_target(nt);
+ free_param_target(nt);
}
return err;
@@ -248,15 +796,20 @@ static void __exit cleanup_netconsole(vo
struct netconsole_target *nt, *tmp;
unregister_console(&netconsole);
+ dynamic_netconsole_exit();
unregister_netdevice_notifier(&netconsole_netdev_notifier);
/*
- * Remove all targets and destroy them. Skipping the list
- * lock is safe here, and netpoll_cleanup() will sleep.
+ * Targets created via configfs pin references on our module
+ * and would first be rmdir(2)'ed from userspace. We reach
+ * here only when they are already destroyed, and only those
+ * created from the boot/module option are left, so remove and
+ * destroy them. Skipping the list lock is safe here, and
+ * netpoll_cleanup() will sleep.
*/
list_for_each_entry_safe(nt, tmp, &target_list, list) {
list_del(&nt->list);
- free_target(nt);
+ free_param_target(nt);
}
}
diff -puN include/linux/netpoll.h~netconsole-support-dynamic-reconfiguration-using-configfs include/linux/netpoll.h
--- a/include/linux/netpoll.h~netconsole-support-dynamic-reconfiguration-using-configfs
+++ a/include/linux/netpoll.h
@@ -35,6 +35,7 @@ struct netpoll_info {
void netpoll_poll(struct netpoll *np);
void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
+void netpoll_print_options(struct netpoll *np);
int netpoll_parse_options(struct netpoll *np, char *opt);
int netpoll_setup(struct netpoll *np);
int netpoll_trap(void);
diff -puN net/core/netpoll.c~netconsole-support-dynamic-reconfiguration-using-configfs net/core/netpoll.c
--- a/net/core/netpoll.c~netconsole-support-dynamic-reconfiguration-using-configfs
+++ a/net/core/netpoll.c
@@ -532,6 +532,29 @@ out:
return 0;
}
+void netpoll_print_options(struct netpoll *np)
+{
+ printk(KERN_INFO "%s: local port %d\n",
+ np->name, np->local_port);
+ printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
+ np->name, HIPQUAD(np->local_ip));
+ printk(KERN_INFO "%s: interface %s\n",
+ np->name, np->dev_name);
+ printk(KERN_INFO "%s: remote port %d\n",
+ np->name, np->remote_port);
+ printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n",
+ np->name, HIPQUAD(np->remote_ip));
+ printk(KERN_INFO "%s: remote ethernet address "
+ "%02x:%02x:%02x:%02x:%02x:%02x\n",
+ np->name,
+ np->remote_mac[0],
+ np->remote_mac[1],
+ np->remote_mac[2],
+ np->remote_mac[3],
+ np->remote_mac[4],
+ np->remote_mac[5]);
+}
+
int netpoll_parse_options(struct netpoll *np, char *opt)
{
char *cur=opt, *delim;
@@ -544,7 +567,6 @@ int netpoll_parse_options(struct netpoll
cur = delim;
}
cur++;
- printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port);
if (*cur != '/') {
if ((delim = strchr(cur, '/')) == NULL)
@@ -552,9 +574,6 @@ int netpoll_parse_options(struct netpoll
*delim = 0;
np->local_ip = ntohl(in_aton(cur));
cur = delim;
-
- printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
- np->name, HIPQUAD(np->local_ip));
}
cur++;
@@ -568,8 +587,6 @@ int netpoll_parse_options(struct netpoll
}
cur++;
- printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name);
-
if (*cur != '@') {
/* dst port */
if ((delim = strchr(cur, '@')) == NULL)
@@ -579,7 +596,6 @@ int netpoll_parse_options(struct netpoll
cur = delim;
}
cur++;
- printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port);
/* dst ip */
if ((delim = strchr(cur, '/')) == NULL)
@@ -588,9 +604,6 @@ int netpoll_parse_options(struct netpoll
np->remote_ip = ntohl(in_aton(cur));
cur = delim + 1;
- printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n",
- np->name, HIPQUAD(np->remote_ip));
-
if (*cur != 0) {
/* MAC address */
if ((delim = strchr(cur, ':')) == NULL)
@@ -621,15 +634,7 @@ int netpoll_parse_options(struct netpoll
np->remote_mac[5] = simple_strtol(cur, NULL, 16);
}
- printk(KERN_INFO "%s: remote ethernet address "
- "%02x:%02x:%02x:%02x:%02x:%02x\n",
- np->name,
- np->remote_mac[0],
- np->remote_mac[1],
- np->remote_mac[2],
- np->remote_mac[3],
- np->remote_mac[4],
- np->remote_mac[5]);
+ netpoll_print_options(np);
return 0;
@@ -831,6 +836,7 @@ void netpoll_set_trap(int trap)
EXPORT_SYMBOL(netpoll_set_trap);
EXPORT_SYMBOL(netpoll_trap);
+EXPORT_SYMBOL(netpoll_print_options);
EXPORT_SYMBOL(netpoll_parse_options);
EXPORT_SYMBOL(netpoll_setup);
EXPORT_SYMBOL(netpoll_cleanup);
_
-
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