linux/net/core/net-sysfs.c
Stephen Hemminger 699a411451 [NET]: Allow controlling NAPI device weight with sysfs
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>
2005-06-08 14:55:42 -07:00

479 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);
}