Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * 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/capability.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>

#include <net/iw_handler.h>

#include "net-sysfs.h"

#ifdef CONFIG_SYSFS

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 device *dev,

                           struct device_attribute *attr, char *buf,

                           ssize_t (*format)(const struct net_device *, char *))

{

        struct net_device *net = to_net_dev(dev);

        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 device *dev,                         \

                            struct device_attribute *attr, char *buf)   \

{                                                                       \

        return netdev_show(dev, attr, buf, format_##field);             \

}

/* use same locking and permission rules as SIF* ioctl's */

static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,

                            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;

}

NETDEVICE_SHOW(addr_len, fmt_dec);

NETDEVICE_SHOW(iflink, fmt_dec);

NETDEVICE_SHOW(ifindex, fmt_dec);

NETDEVICE_SHOW(features, fmt_long_hex);

NETDEVICE_SHOW(type, fmt_dec);

NETDEVICE_SHOW(link_mode, 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 device *dev, struct device_attribute *attr,

                            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 device *dev,

                            struct device_attribute *attr, 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 device *dev,

                            struct device_attribute *attr, 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 ssize_t show_dormant(struct device *dev,

                            struct device_attribute *attr, char *buf)

{

        struct net_device *netdev = to_net_dev(dev);

        if (netif_running(netdev))

                return sprintf(buf, fmt_dec, !!netif_dormant(netdev));

        return -EINVAL;

}

static const char *operstates[] = {

        "unknown",

        "notpresent", /* currently unused */

        "down",

        "lowerlayerdown",

        "testing", /* currently unused */

        "dormant",

        "up"

};

static ssize_t show_operstate(struct device *dev,

                              struct device_attribute *attr, char *buf)

{

        const struct net_device *netdev = to_net_dev(dev);

        unsigned char operstate;

        read_lock(&dev_base_lock);

        operstate = netdev->operstate;

        if (!netif_running(netdev))

                operstate = IF_OPER_DOWN;

        read_unlock(&dev_base_lock);

        if (operstate >= ARRAY_SIZE(operstates))

                return -EINVAL; /* should not happen */

        return sprintf(buf, "%s\n", operstates[operstate]);

}

/* 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 device *dev, struct device_attribute *attr,

                         const char *buf, size_t len)

{

        return netdev_store(dev, attr, buf, len, change_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 device *dev, struct device_attribute *attr,

                           const char *buf, size_t len)

{

        return netdev_store(dev, attr, buf, len, change_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 device *dev,

                                  struct device_attribute *attr,

                                  const char *buf, size_t len)

{

        return netdev_store(dev, attr, buf, len, change_tx_queue_len);

}

static struct device_attribute net_class_attributes[] = {

        __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),

        __ATTR(iflink, S_IRUGO, show_iflink, NULL),

        __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),

        __ATTR(features, S_IRUGO, show_features, NULL),

        __ATTR(type, S_IRUGO, show_type, NULL),

        __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),

        __ATTR(address, S_IRUGO, show_address, NULL),

        __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),

        __ATTR(carrier, S_IRUGO, show_carrier, NULL),

        __ATTR(dormant, S_IRUGO, show_dormant, NULL),

        __ATTR(operstate, S_IRUGO, show_operstate, NULL),

        __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),

        __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),

        __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,

               store_tx_queue_len),

        {}

};

/* Show a given an attribute in the statistics group */

static ssize_t netstat_show(const struct device *d,

                            struct device_attribute *attr, char *buf,

                            unsigned long offset)

{

        struct net_device *dev = to_net_dev(d);

        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 device *d,                            \

                           struct device_attribute *attr, char *buf)    \

{                                                                       \

        return netstat_show(d, attr, buf,                               \

                            offsetof(struct net_device_stats, name));   \

}                                                                       \

static 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[] = {

        &dev_attr_rx_packets.attr,

        &dev_attr_tx_packets.attr,

        &dev_attr_rx_bytes.attr,

        &dev_attr_tx_bytes.attr,

        &dev_attr_rx_errors.attr,

        &dev_attr_tx_errors.attr,

        &dev_attr_rx_dropped.attr,

        &dev_attr_tx_dropped.attr,

        &dev_attr_multicast.attr,

        &dev_attr_collisions.attr,

        &dev_attr_rx_length_errors.attr,

        &dev_attr_rx_over_errors.attr,

        &dev_attr_rx_crc_errors.attr,

        &dev_attr_rx_frame_errors.attr,

        &dev_attr_rx_fifo_errors.attr,

        &dev_attr_rx_missed_errors.attr,

        &dev_attr_tx_aborted_errors.attr,

        &dev_attr_tx_carrier_errors.attr,

        &dev_attr_tx_fifo_errors.attr,

        &dev_attr_tx_heartbeat_errors.attr,

        &dev_attr_tx_window_errors.attr,

        &dev_attr_rx_compressed.attr,

        &dev_attr_tx_compressed.attr,

        NULL

};

static struct attribute_group netstat_group = {

        .name  = "statistics",

        .attrs  = netstat_attrs,

};

#ifdef CONFIG_WIRELESS_EXT

/* helper function that does all the locking etc for wireless stats */

static ssize_t wireless_show(struct device *d, char *buf,

                             ssize_t (*format)(const struct iw_statistics *,

                                               char *))

{

        struct net_device *dev = to_net_dev(d);

        const struct iw_statistics *iw = NULL;

        ssize_t ret = -EINVAL;

        read_lock(&dev_base_lock);

        if (dev_isalive(dev)) {

                if (dev->wireless_handlers &&

                    dev->wireless_handlers->get_wireless_stats)

                        iw = dev->wireless_handlers->get_wireless_stats(dev);

                if (iw != 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 device *d,                         \

                              struct device_attribute *attr, char *buf) \

{                                                                       \

        return wireless_show(d, buf, format_iw_##name);                 \

}                                                                       \

static 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[] = {

        &dev_attr_status.attr,

        &dev_attr_link.attr,

        &dev_attr_level.attr,

        &dev_attr_noise.attr,

        &dev_attr_nwid.attr,

        &dev_attr_crypt.attr,

        &dev_attr_fragment.attr,

        &dev_attr_retries.attr,

        &dev_attr_misc.attr,

        &dev_attr_beacon.attr,

        NULL

};

static struct attribute_group wireless_group = {

        .name = "wireless",

        .attrs = wireless_attrs,

};

#endif

#endif /* CONFIG_SYSFS */

#ifdef CONFIG_HOTPLUG

static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)

{

        struct net_device *dev = to_net_dev(d);

        int retval;

        /* pass interface to uevent. */

        retval = add_uevent_var(env, "INTERFACE=%s", dev->name);

        if (retval)

                goto exit;

        /* pass ifindex to uevent.

         * ifindex is useful as it won't change (interface name may change)

         * and is what RtNetlink uses natively. */

        retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);

exit:

        return retval;

}

#endif

/*

 *      netdev_release -- destroy and free a dead device.

 *      Called when last reference to device kobject is gone.

 */

static void netdev_release(struct device *d)

{

        struct net_device *dev = to_net_dev(d);

        BUG_ON(dev->reg_state != NETREG_RELEASED);

        kfree((char *)dev - dev->padded);

}

static struct class net_class = {

        .name = "net",

        .dev_release = netdev_release,

#ifdef CONFIG_SYSFS

        .dev_attrs = net_class_attributes,

#endif /* CONFIG_SYSFS */

#ifdef CONFIG_HOTPLUG

        .dev_uevent = netdev_uevent,

#endif

};

/* Delete sysfs entries but hold kobject reference until after all

 * netdev references are gone.

 */

void netdev_unregister_kobject(struct net_device * net)

{

        struct device *dev = &(net->dev);

        kobject_get(&dev->kobj);

        device_del(dev);

}

/* Create sysfs entries for network device. */

int netdev_register_kobject(struct net_device *net)

{

        struct device *dev = &(net->dev);

        struct attribute_group **groups = net->sysfs_groups;

        device_initialize(dev);

        dev->class = &net_class;

        dev->platform_data = net;

        dev->groups = groups;

        BUILD_BUG_ON(BUS_ID_SIZE < IFNAMSIZ);

        strlcpy(dev->bus_id, net->name, BUS_ID_SIZE);

#ifdef CONFIG_SYSFS

        if (net->get_stats)

                *groups++ = &netstat_group;

#ifdef CONFIG_WIRELESS_EXT

        if (net->wireless_handlers && net->wireless_handlers->get_wireless_stats)

                *groups++ = &wireless_group;

#endif

#endif /* CONFIG_SYSFS */

        return device_add(dev);

}

int netdev_kobject_init(void)

{

        return class_register(&net_class);

}