mirror of
https://github.com/torvalds/linux.git
synced 2024-12-11 13:41:55 +00:00
699a411451
Simple interface to allow changing network device scheduling weight with sysfs. Please consider this for 2.6.12, since risk/impact is small. Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
480 lines
13 KiB
C
480 lines
13 KiB
C
/*
|
|
* net-sysfs.c - network device class and attributes
|
|
*
|
|
* Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/if_arp.h>
|
|
#include <net/sock.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/wireless.h>
|
|
|
|
#define to_class_dev(obj) container_of(obj,struct class_device,kobj)
|
|
#define to_net_dev(class) container_of(class, struct net_device, class_dev)
|
|
|
|
static const char fmt_hex[] = "%#x\n";
|
|
static const char fmt_long_hex[] = "%#lx\n";
|
|
static const char fmt_dec[] = "%d\n";
|
|
static const char fmt_ulong[] = "%lu\n";
|
|
|
|
static inline int dev_isalive(const struct net_device *dev)
|
|
{
|
|
return dev->reg_state == NETREG_REGISTERED;
|
|
}
|
|
|
|
/* use same locking rules as GIF* ioctl's */
|
|
static ssize_t netdev_show(const struct class_device *cd, char *buf,
|
|
ssize_t (*format)(const struct net_device *, char *))
|
|
{
|
|
struct net_device *net = to_net_dev(cd);
|
|
ssize_t ret = -EINVAL;
|
|
|
|
read_lock(&dev_base_lock);
|
|
if (dev_isalive(net))
|
|
ret = (*format)(net, buf);
|
|
read_unlock(&dev_base_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* generate a show function for simple field */
|
|
#define NETDEVICE_SHOW(field, format_string) \
|
|
static ssize_t format_##field(const struct net_device *net, char *buf) \
|
|
{ \
|
|
return sprintf(buf, format_string, net->field); \
|
|
} \
|
|
static ssize_t show_##field(struct class_device *cd, char *buf) \
|
|
{ \
|
|
return netdev_show(cd, buf, format_##field); \
|
|
}
|
|
|
|
|
|
/* use same locking and permission rules as SIF* ioctl's */
|
|
static ssize_t netdev_store(struct class_device *dev,
|
|
const char *buf, size_t len,
|
|
int (*set)(struct net_device *, unsigned long))
|
|
{
|
|
struct net_device *net = to_net_dev(dev);
|
|
char *endp;
|
|
unsigned long new;
|
|
int ret = -EINVAL;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
new = simple_strtoul(buf, &endp, 0);
|
|
if (endp == buf)
|
|
goto err;
|
|
|
|
rtnl_lock();
|
|
if (dev_isalive(net)) {
|
|
if ((ret = (*set)(net, new)) == 0)
|
|
ret = len;
|
|
}
|
|
rtnl_unlock();
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
/* generate a read-only network device class attribute */
|
|
#define NETDEVICE_ATTR(field, format_string) \
|
|
NETDEVICE_SHOW(field, format_string) \
|
|
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL) \
|
|
|
|
NETDEVICE_ATTR(addr_len, fmt_dec);
|
|
NETDEVICE_ATTR(iflink, fmt_dec);
|
|
NETDEVICE_ATTR(ifindex, fmt_dec);
|
|
NETDEVICE_ATTR(features, fmt_long_hex);
|
|
NETDEVICE_ATTR(type, fmt_dec);
|
|
|
|
/* use same locking rules as GIFHWADDR ioctl's */
|
|
static ssize_t format_addr(char *buf, const unsigned char *addr, int len)
|
|
{
|
|
int i;
|
|
char *cp = buf;
|
|
|
|
for (i = 0; i < len; i++)
|
|
cp += sprintf(cp, "%02x%c", addr[i],
|
|
i == (len - 1) ? '\n' : ':');
|
|
return cp - buf;
|
|
}
|
|
|
|
static ssize_t show_address(struct class_device *dev, char *buf)
|
|
{
|
|
struct net_device *net = to_net_dev(dev);
|
|
ssize_t ret = -EINVAL;
|
|
|
|
read_lock(&dev_base_lock);
|
|
if (dev_isalive(net))
|
|
ret = format_addr(buf, net->dev_addr, net->addr_len);
|
|
read_unlock(&dev_base_lock);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t show_broadcast(struct class_device *dev, char *buf)
|
|
{
|
|
struct net_device *net = to_net_dev(dev);
|
|
if (dev_isalive(net))
|
|
return format_addr(buf, net->broadcast, net->addr_len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static ssize_t show_carrier(struct class_device *dev, char *buf)
|
|
{
|
|
struct net_device *netdev = to_net_dev(dev);
|
|
if (netif_running(netdev)) {
|
|
return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static CLASS_DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
|
|
static CLASS_DEVICE_ATTR(broadcast, S_IRUGO, show_broadcast, NULL);
|
|
static CLASS_DEVICE_ATTR(carrier, S_IRUGO, show_carrier, NULL);
|
|
|
|
/* read-write attributes */
|
|
NETDEVICE_SHOW(mtu, fmt_dec);
|
|
|
|
static int change_mtu(struct net_device *net, unsigned long new_mtu)
|
|
{
|
|
return dev_set_mtu(net, (int) new_mtu);
|
|
}
|
|
|
|
static ssize_t store_mtu(struct class_device *dev, const char *buf, size_t len)
|
|
{
|
|
return netdev_store(dev, buf, len, change_mtu);
|
|
}
|
|
|
|
static CLASS_DEVICE_ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu);
|
|
|
|
NETDEVICE_SHOW(flags, fmt_hex);
|
|
|
|
static int change_flags(struct net_device *net, unsigned long new_flags)
|
|
{
|
|
return dev_change_flags(net, (unsigned) new_flags);
|
|
}
|
|
|
|
static ssize_t store_flags(struct class_device *dev, const char *buf, size_t len)
|
|
{
|
|
return netdev_store(dev, buf, len, change_flags);
|
|
}
|
|
|
|
static CLASS_DEVICE_ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags);
|
|
|
|
NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
|
|
|
|
static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
|
|
{
|
|
net->tx_queue_len = new_len;
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t store_tx_queue_len(struct class_device *dev, const char *buf, size_t len)
|
|
{
|
|
return netdev_store(dev, buf, len, change_tx_queue_len);
|
|
}
|
|
|
|
static CLASS_DEVICE_ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
|
|
store_tx_queue_len);
|
|
|
|
NETDEVICE_SHOW(weight, fmt_dec);
|
|
|
|
static int change_weight(struct net_device *net, unsigned long new_weight)
|
|
{
|
|
net->weight = new_weight;
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t store_weight(struct class_device *dev, const char *buf, size_t len)
|
|
{
|
|
return netdev_store(dev, buf, len, change_weight);
|
|
}
|
|
|
|
static CLASS_DEVICE_ATTR(weight, S_IRUGO | S_IWUSR, show_weight,
|
|
store_weight);
|
|
|
|
|
|
static struct class_device_attribute *net_class_attributes[] = {
|
|
&class_device_attr_ifindex,
|
|
&class_device_attr_iflink,
|
|
&class_device_attr_addr_len,
|
|
&class_device_attr_tx_queue_len,
|
|
&class_device_attr_features,
|
|
&class_device_attr_mtu,
|
|
&class_device_attr_flags,
|
|
&class_device_attr_weight,
|
|
&class_device_attr_type,
|
|
&class_device_attr_address,
|
|
&class_device_attr_broadcast,
|
|
&class_device_attr_carrier,
|
|
NULL
|
|
};
|
|
|
|
/* Show a given an attribute in the statistics group */
|
|
static ssize_t netstat_show(const struct class_device *cd, char *buf,
|
|
unsigned long offset)
|
|
{
|
|
struct net_device *dev = to_net_dev(cd);
|
|
struct net_device_stats *stats;
|
|
ssize_t ret = -EINVAL;
|
|
|
|
if (offset > sizeof(struct net_device_stats) ||
|
|
offset % sizeof(unsigned long) != 0)
|
|
WARN_ON(1);
|
|
|
|
read_lock(&dev_base_lock);
|
|
if (dev_isalive(dev) && dev->get_stats &&
|
|
(stats = (*dev->get_stats)(dev)))
|
|
ret = sprintf(buf, fmt_ulong,
|
|
*(unsigned long *)(((u8 *) stats) + offset));
|
|
|
|
read_unlock(&dev_base_lock);
|
|
return ret;
|
|
}
|
|
|
|
/* generate a read-only statistics attribute */
|
|
#define NETSTAT_ENTRY(name) \
|
|
static ssize_t show_##name(struct class_device *cd, char *buf) \
|
|
{ \
|
|
return netstat_show(cd, buf, \
|
|
offsetof(struct net_device_stats, name)); \
|
|
} \
|
|
static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
|
|
|
|
NETSTAT_ENTRY(rx_packets);
|
|
NETSTAT_ENTRY(tx_packets);
|
|
NETSTAT_ENTRY(rx_bytes);
|
|
NETSTAT_ENTRY(tx_bytes);
|
|
NETSTAT_ENTRY(rx_errors);
|
|
NETSTAT_ENTRY(tx_errors);
|
|
NETSTAT_ENTRY(rx_dropped);
|
|
NETSTAT_ENTRY(tx_dropped);
|
|
NETSTAT_ENTRY(multicast);
|
|
NETSTAT_ENTRY(collisions);
|
|
NETSTAT_ENTRY(rx_length_errors);
|
|
NETSTAT_ENTRY(rx_over_errors);
|
|
NETSTAT_ENTRY(rx_crc_errors);
|
|
NETSTAT_ENTRY(rx_frame_errors);
|
|
NETSTAT_ENTRY(rx_fifo_errors);
|
|
NETSTAT_ENTRY(rx_missed_errors);
|
|
NETSTAT_ENTRY(tx_aborted_errors);
|
|
NETSTAT_ENTRY(tx_carrier_errors);
|
|
NETSTAT_ENTRY(tx_fifo_errors);
|
|
NETSTAT_ENTRY(tx_heartbeat_errors);
|
|
NETSTAT_ENTRY(tx_window_errors);
|
|
NETSTAT_ENTRY(rx_compressed);
|
|
NETSTAT_ENTRY(tx_compressed);
|
|
|
|
static struct attribute *netstat_attrs[] = {
|
|
&class_device_attr_rx_packets.attr,
|
|
&class_device_attr_tx_packets.attr,
|
|
&class_device_attr_rx_bytes.attr,
|
|
&class_device_attr_tx_bytes.attr,
|
|
&class_device_attr_rx_errors.attr,
|
|
&class_device_attr_tx_errors.attr,
|
|
&class_device_attr_rx_dropped.attr,
|
|
&class_device_attr_tx_dropped.attr,
|
|
&class_device_attr_multicast.attr,
|
|
&class_device_attr_collisions.attr,
|
|
&class_device_attr_rx_length_errors.attr,
|
|
&class_device_attr_rx_over_errors.attr,
|
|
&class_device_attr_rx_crc_errors.attr,
|
|
&class_device_attr_rx_frame_errors.attr,
|
|
&class_device_attr_rx_fifo_errors.attr,
|
|
&class_device_attr_rx_missed_errors.attr,
|
|
&class_device_attr_tx_aborted_errors.attr,
|
|
&class_device_attr_tx_carrier_errors.attr,
|
|
&class_device_attr_tx_fifo_errors.attr,
|
|
&class_device_attr_tx_heartbeat_errors.attr,
|
|
&class_device_attr_tx_window_errors.attr,
|
|
&class_device_attr_rx_compressed.attr,
|
|
&class_device_attr_tx_compressed.attr,
|
|
NULL
|
|
};
|
|
|
|
|
|
static struct attribute_group netstat_group = {
|
|
.name = "statistics",
|
|
.attrs = netstat_attrs,
|
|
};
|
|
|
|
#ifdef WIRELESS_EXT
|
|
/* helper function that does all the locking etc for wireless stats */
|
|
static ssize_t wireless_show(struct class_device *cd, char *buf,
|
|
ssize_t (*format)(const struct iw_statistics *,
|
|
char *))
|
|
{
|
|
struct net_device *dev = to_net_dev(cd);
|
|
const struct iw_statistics *iw;
|
|
ssize_t ret = -EINVAL;
|
|
|
|
read_lock(&dev_base_lock);
|
|
if (dev_isalive(dev) && dev->get_wireless_stats
|
|
&& (iw = dev->get_wireless_stats(dev)) != NULL)
|
|
ret = (*format)(iw, buf);
|
|
read_unlock(&dev_base_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* show function template for wireless fields */
|
|
#define WIRELESS_SHOW(name, field, format_string) \
|
|
static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
|
|
{ \
|
|
return sprintf(buf, format_string, iw->field); \
|
|
} \
|
|
static ssize_t show_iw_##name(struct class_device *cd, char *buf) \
|
|
{ \
|
|
return wireless_show(cd, buf, format_iw_##name); \
|
|
} \
|
|
static CLASS_DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
|
|
|
|
WIRELESS_SHOW(status, status, fmt_hex);
|
|
WIRELESS_SHOW(link, qual.qual, fmt_dec);
|
|
WIRELESS_SHOW(level, qual.level, fmt_dec);
|
|
WIRELESS_SHOW(noise, qual.noise, fmt_dec);
|
|
WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
|
|
WIRELESS_SHOW(crypt, discard.code, fmt_dec);
|
|
WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
|
|
WIRELESS_SHOW(misc, discard.misc, fmt_dec);
|
|
WIRELESS_SHOW(retries, discard.retries, fmt_dec);
|
|
WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
|
|
|
|
static struct attribute *wireless_attrs[] = {
|
|
&class_device_attr_status.attr,
|
|
&class_device_attr_link.attr,
|
|
&class_device_attr_level.attr,
|
|
&class_device_attr_noise.attr,
|
|
&class_device_attr_nwid.attr,
|
|
&class_device_attr_crypt.attr,
|
|
&class_device_attr_fragment.attr,
|
|
&class_device_attr_retries.attr,
|
|
&class_device_attr_misc.attr,
|
|
&class_device_attr_beacon.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group wireless_group = {
|
|
.name = "wireless",
|
|
.attrs = wireless_attrs,
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_HOTPLUG
|
|
static int netdev_hotplug(struct class_device *cd, char **envp,
|
|
int num_envp, char *buf, int size)
|
|
{
|
|
struct net_device *dev = to_net_dev(cd);
|
|
int i = 0;
|
|
int n;
|
|
|
|
/* pass interface in env to hotplug. */
|
|
envp[i++] = buf;
|
|
n = snprintf(buf, size, "INTERFACE=%s", dev->name) + 1;
|
|
buf += n;
|
|
size -= n;
|
|
|
|
if ((size <= 0) || (i >= num_envp))
|
|
return -ENOMEM;
|
|
|
|
envp[i] = NULL;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* netdev_release -- destroy and free a dead device.
|
|
* Called when last reference to class_device kobject is gone.
|
|
*/
|
|
static void netdev_release(struct class_device *cd)
|
|
{
|
|
struct net_device *dev
|
|
= container_of(cd, struct net_device, class_dev);
|
|
|
|
BUG_ON(dev->reg_state != NETREG_RELEASED);
|
|
|
|
kfree((char *)dev - dev->padded);
|
|
}
|
|
|
|
static struct class net_class = {
|
|
.name = "net",
|
|
.release = netdev_release,
|
|
#ifdef CONFIG_HOTPLUG
|
|
.hotplug = netdev_hotplug,
|
|
#endif
|
|
};
|
|
|
|
void netdev_unregister_sysfs(struct net_device * net)
|
|
{
|
|
struct class_device * class_dev = &(net->class_dev);
|
|
|
|
if (net->get_stats)
|
|
sysfs_remove_group(&class_dev->kobj, &netstat_group);
|
|
|
|
#ifdef WIRELESS_EXT
|
|
if (net->get_wireless_stats)
|
|
sysfs_remove_group(&class_dev->kobj, &wireless_group);
|
|
#endif
|
|
class_device_del(class_dev);
|
|
|
|
}
|
|
|
|
/* Create sysfs entries for network device. */
|
|
int netdev_register_sysfs(struct net_device *net)
|
|
{
|
|
struct class_device *class_dev = &(net->class_dev);
|
|
int i;
|
|
struct class_device_attribute *attr;
|
|
int ret;
|
|
|
|
class_dev->class = &net_class;
|
|
class_dev->class_data = net;
|
|
|
|
strlcpy(class_dev->class_id, net->name, BUS_ID_SIZE);
|
|
if ((ret = class_device_register(class_dev)))
|
|
goto out;
|
|
|
|
for (i = 0; (attr = net_class_attributes[i]) != NULL; i++) {
|
|
if ((ret = class_device_create_file(class_dev, attr)))
|
|
goto out_unreg;
|
|
}
|
|
|
|
|
|
if (net->get_stats &&
|
|
(ret = sysfs_create_group(&class_dev->kobj, &netstat_group)))
|
|
goto out_unreg;
|
|
|
|
#ifdef WIRELESS_EXT
|
|
if (net->get_wireless_stats &&
|
|
(ret = sysfs_create_group(&class_dev->kobj, &wireless_group)))
|
|
goto out_cleanup;
|
|
|
|
return 0;
|
|
out_cleanup:
|
|
if (net->get_stats)
|
|
sysfs_remove_group(&class_dev->kobj, &netstat_group);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
|
|
out_unreg:
|
|
printk(KERN_WARNING "%s: sysfs attribute registration failed %d\n",
|
|
net->name, ret);
|
|
class_device_unregister(class_dev);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int netdev_sysfs_init(void)
|
|
{
|
|
return class_register(&net_class);
|
|
}
|