cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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net-sysfs.c (49735B)


      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * net-sysfs.c - network device class and attributes
      4 *
      5 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
      6 */
      7
      8#include <linux/capability.h>
      9#include <linux/kernel.h>
     10#include <linux/netdevice.h>
     11#include <linux/if_arp.h>
     12#include <linux/slab.h>
     13#include <linux/sched/signal.h>
     14#include <linux/sched/isolation.h>
     15#include <linux/nsproxy.h>
     16#include <net/sock.h>
     17#include <net/net_namespace.h>
     18#include <linux/rtnetlink.h>
     19#include <linux/vmalloc.h>
     20#include <linux/export.h>
     21#include <linux/jiffies.h>
     22#include <linux/pm_runtime.h>
     23#include <linux/of.h>
     24#include <linux/of_net.h>
     25#include <linux/cpu.h>
     26
     27#include "dev.h"
     28#include "net-sysfs.h"
     29
     30#ifdef CONFIG_SYSFS
     31static const char fmt_hex[] = "%#x\n";
     32static const char fmt_dec[] = "%d\n";
     33static const char fmt_ulong[] = "%lu\n";
     34static const char fmt_u64[] = "%llu\n";
     35
     36/* Caller holds RTNL or dev_base_lock */
     37static inline int dev_isalive(const struct net_device *dev)
     38{
     39	return dev->reg_state <= NETREG_REGISTERED;
     40}
     41
     42/* use same locking rules as GIF* ioctl's */
     43static ssize_t netdev_show(const struct device *dev,
     44			   struct device_attribute *attr, char *buf,
     45			   ssize_t (*format)(const struct net_device *, char *))
     46{
     47	struct net_device *ndev = to_net_dev(dev);
     48	ssize_t ret = -EINVAL;
     49
     50	read_lock(&dev_base_lock);
     51	if (dev_isalive(ndev))
     52		ret = (*format)(ndev, buf);
     53	read_unlock(&dev_base_lock);
     54
     55	return ret;
     56}
     57
     58/* generate a show function for simple field */
     59#define NETDEVICE_SHOW(field, format_string)				\
     60static ssize_t format_##field(const struct net_device *dev, char *buf)	\
     61{									\
     62	return sprintf(buf, format_string, dev->field);			\
     63}									\
     64static ssize_t field##_show(struct device *dev,				\
     65			    struct device_attribute *attr, char *buf)	\
     66{									\
     67	return netdev_show(dev, attr, buf, format_##field);		\
     68}									\
     69
     70#define NETDEVICE_SHOW_RO(field, format_string)				\
     71NETDEVICE_SHOW(field, format_string);					\
     72static DEVICE_ATTR_RO(field)
     73
     74#define NETDEVICE_SHOW_RW(field, format_string)				\
     75NETDEVICE_SHOW(field, format_string);					\
     76static DEVICE_ATTR_RW(field)
     77
     78/* use same locking and permission rules as SIF* ioctl's */
     79static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
     80			    const char *buf, size_t len,
     81			    int (*set)(struct net_device *, unsigned long))
     82{
     83	struct net_device *netdev = to_net_dev(dev);
     84	struct net *net = dev_net(netdev);
     85	unsigned long new;
     86	int ret;
     87
     88	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
     89		return -EPERM;
     90
     91	ret = kstrtoul(buf, 0, &new);
     92	if (ret)
     93		goto err;
     94
     95	if (!rtnl_trylock())
     96		return restart_syscall();
     97
     98	if (dev_isalive(netdev)) {
     99		ret = (*set)(netdev, new);
    100		if (ret == 0)
    101			ret = len;
    102	}
    103	rtnl_unlock();
    104 err:
    105	return ret;
    106}
    107
    108NETDEVICE_SHOW_RO(dev_id, fmt_hex);
    109NETDEVICE_SHOW_RO(dev_port, fmt_dec);
    110NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
    111NETDEVICE_SHOW_RO(addr_len, fmt_dec);
    112NETDEVICE_SHOW_RO(ifindex, fmt_dec);
    113NETDEVICE_SHOW_RO(type, fmt_dec);
    114NETDEVICE_SHOW_RO(link_mode, fmt_dec);
    115
    116static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
    117			   char *buf)
    118{
    119	struct net_device *ndev = to_net_dev(dev);
    120
    121	return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
    122}
    123static DEVICE_ATTR_RO(iflink);
    124
    125static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
    126{
    127	return sprintf(buf, fmt_dec, dev->name_assign_type);
    128}
    129
    130static ssize_t name_assign_type_show(struct device *dev,
    131				     struct device_attribute *attr,
    132				     char *buf)
    133{
    134	struct net_device *ndev = to_net_dev(dev);
    135	ssize_t ret = -EINVAL;
    136
    137	if (ndev->name_assign_type != NET_NAME_UNKNOWN)
    138		ret = netdev_show(dev, attr, buf, format_name_assign_type);
    139
    140	return ret;
    141}
    142static DEVICE_ATTR_RO(name_assign_type);
    143
    144/* use same locking rules as GIFHWADDR ioctl's */
    145static ssize_t address_show(struct device *dev, struct device_attribute *attr,
    146			    char *buf)
    147{
    148	struct net_device *ndev = to_net_dev(dev);
    149	ssize_t ret = -EINVAL;
    150
    151	read_lock(&dev_base_lock);
    152	if (dev_isalive(ndev))
    153		ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
    154	read_unlock(&dev_base_lock);
    155	return ret;
    156}
    157static DEVICE_ATTR_RO(address);
    158
    159static ssize_t broadcast_show(struct device *dev,
    160			      struct device_attribute *attr, char *buf)
    161{
    162	struct net_device *ndev = to_net_dev(dev);
    163
    164	if (dev_isalive(ndev))
    165		return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
    166	return -EINVAL;
    167}
    168static DEVICE_ATTR_RO(broadcast);
    169
    170static int change_carrier(struct net_device *dev, unsigned long new_carrier)
    171{
    172	if (!netif_running(dev))
    173		return -EINVAL;
    174	return dev_change_carrier(dev, (bool)new_carrier);
    175}
    176
    177static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
    178			     const char *buf, size_t len)
    179{
    180	struct net_device *netdev = to_net_dev(dev);
    181
    182	/* The check is also done in change_carrier; this helps returning early
    183	 * without hitting the trylock/restart in netdev_store.
    184	 */
    185	if (!netdev->netdev_ops->ndo_change_carrier)
    186		return -EOPNOTSUPP;
    187
    188	return netdev_store(dev, attr, buf, len, change_carrier);
    189}
    190
    191static ssize_t carrier_show(struct device *dev,
    192			    struct device_attribute *attr, char *buf)
    193{
    194	struct net_device *netdev = to_net_dev(dev);
    195
    196	if (netif_running(netdev))
    197		return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
    198
    199	return -EINVAL;
    200}
    201static DEVICE_ATTR_RW(carrier);
    202
    203static ssize_t speed_show(struct device *dev,
    204			  struct device_attribute *attr, char *buf)
    205{
    206	struct net_device *netdev = to_net_dev(dev);
    207	int ret = -EINVAL;
    208
    209	/* The check is also done in __ethtool_get_link_ksettings; this helps
    210	 * returning early without hitting the trylock/restart below.
    211	 */
    212	if (!netdev->ethtool_ops->get_link_ksettings)
    213		return ret;
    214
    215	if (!rtnl_trylock())
    216		return restart_syscall();
    217
    218	if (netif_running(netdev) && netif_device_present(netdev)) {
    219		struct ethtool_link_ksettings cmd;
    220
    221		if (!__ethtool_get_link_ksettings(netdev, &cmd))
    222			ret = sprintf(buf, fmt_dec, cmd.base.speed);
    223	}
    224	rtnl_unlock();
    225	return ret;
    226}
    227static DEVICE_ATTR_RO(speed);
    228
    229static ssize_t duplex_show(struct device *dev,
    230			   struct device_attribute *attr, char *buf)
    231{
    232	struct net_device *netdev = to_net_dev(dev);
    233	int ret = -EINVAL;
    234
    235	/* The check is also done in __ethtool_get_link_ksettings; this helps
    236	 * returning early without hitting the trylock/restart below.
    237	 */
    238	if (!netdev->ethtool_ops->get_link_ksettings)
    239		return ret;
    240
    241	if (!rtnl_trylock())
    242		return restart_syscall();
    243
    244	if (netif_running(netdev)) {
    245		struct ethtool_link_ksettings cmd;
    246
    247		if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
    248			const char *duplex;
    249
    250			switch (cmd.base.duplex) {
    251			case DUPLEX_HALF:
    252				duplex = "half";
    253				break;
    254			case DUPLEX_FULL:
    255				duplex = "full";
    256				break;
    257			default:
    258				duplex = "unknown";
    259				break;
    260			}
    261			ret = sprintf(buf, "%s\n", duplex);
    262		}
    263	}
    264	rtnl_unlock();
    265	return ret;
    266}
    267static DEVICE_ATTR_RO(duplex);
    268
    269static ssize_t testing_show(struct device *dev,
    270			    struct device_attribute *attr, char *buf)
    271{
    272	struct net_device *netdev = to_net_dev(dev);
    273
    274	if (netif_running(netdev))
    275		return sprintf(buf, fmt_dec, !!netif_testing(netdev));
    276
    277	return -EINVAL;
    278}
    279static DEVICE_ATTR_RO(testing);
    280
    281static ssize_t dormant_show(struct device *dev,
    282			    struct device_attribute *attr, char *buf)
    283{
    284	struct net_device *netdev = to_net_dev(dev);
    285
    286	if (netif_running(netdev))
    287		return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
    288
    289	return -EINVAL;
    290}
    291static DEVICE_ATTR_RO(dormant);
    292
    293static const char *const operstates[] = {
    294	"unknown",
    295	"notpresent", /* currently unused */
    296	"down",
    297	"lowerlayerdown",
    298	"testing",
    299	"dormant",
    300	"up"
    301};
    302
    303static ssize_t operstate_show(struct device *dev,
    304			      struct device_attribute *attr, char *buf)
    305{
    306	const struct net_device *netdev = to_net_dev(dev);
    307	unsigned char operstate;
    308
    309	read_lock(&dev_base_lock);
    310	operstate = netdev->operstate;
    311	if (!netif_running(netdev))
    312		operstate = IF_OPER_DOWN;
    313	read_unlock(&dev_base_lock);
    314
    315	if (operstate >= ARRAY_SIZE(operstates))
    316		return -EINVAL; /* should not happen */
    317
    318	return sprintf(buf, "%s\n", operstates[operstate]);
    319}
    320static DEVICE_ATTR_RO(operstate);
    321
    322static ssize_t carrier_changes_show(struct device *dev,
    323				    struct device_attribute *attr,
    324				    char *buf)
    325{
    326	struct net_device *netdev = to_net_dev(dev);
    327
    328	return sprintf(buf, fmt_dec,
    329		       atomic_read(&netdev->carrier_up_count) +
    330		       atomic_read(&netdev->carrier_down_count));
    331}
    332static DEVICE_ATTR_RO(carrier_changes);
    333
    334static ssize_t carrier_up_count_show(struct device *dev,
    335				     struct device_attribute *attr,
    336				     char *buf)
    337{
    338	struct net_device *netdev = to_net_dev(dev);
    339
    340	return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
    341}
    342static DEVICE_ATTR_RO(carrier_up_count);
    343
    344static ssize_t carrier_down_count_show(struct device *dev,
    345				       struct device_attribute *attr,
    346				       char *buf)
    347{
    348	struct net_device *netdev = to_net_dev(dev);
    349
    350	return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
    351}
    352static DEVICE_ATTR_RO(carrier_down_count);
    353
    354/* read-write attributes */
    355
    356static int change_mtu(struct net_device *dev, unsigned long new_mtu)
    357{
    358	return dev_set_mtu(dev, (int)new_mtu);
    359}
    360
    361static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
    362			 const char *buf, size_t len)
    363{
    364	return netdev_store(dev, attr, buf, len, change_mtu);
    365}
    366NETDEVICE_SHOW_RW(mtu, fmt_dec);
    367
    368static int change_flags(struct net_device *dev, unsigned long new_flags)
    369{
    370	return dev_change_flags(dev, (unsigned int)new_flags, NULL);
    371}
    372
    373static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
    374			   const char *buf, size_t len)
    375{
    376	return netdev_store(dev, attr, buf, len, change_flags);
    377}
    378NETDEVICE_SHOW_RW(flags, fmt_hex);
    379
    380static ssize_t tx_queue_len_store(struct device *dev,
    381				  struct device_attribute *attr,
    382				  const char *buf, size_t len)
    383{
    384	if (!capable(CAP_NET_ADMIN))
    385		return -EPERM;
    386
    387	return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
    388}
    389NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
    390
    391static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
    392{
    393	WRITE_ONCE(dev->gro_flush_timeout, val);
    394	return 0;
    395}
    396
    397static ssize_t gro_flush_timeout_store(struct device *dev,
    398				       struct device_attribute *attr,
    399				       const char *buf, size_t len)
    400{
    401	if (!capable(CAP_NET_ADMIN))
    402		return -EPERM;
    403
    404	return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
    405}
    406NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
    407
    408static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val)
    409{
    410	WRITE_ONCE(dev->napi_defer_hard_irqs, val);
    411	return 0;
    412}
    413
    414static ssize_t napi_defer_hard_irqs_store(struct device *dev,
    415					  struct device_attribute *attr,
    416					  const char *buf, size_t len)
    417{
    418	if (!capable(CAP_NET_ADMIN))
    419		return -EPERM;
    420
    421	return netdev_store(dev, attr, buf, len, change_napi_defer_hard_irqs);
    422}
    423NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_dec);
    424
    425static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
    426			     const char *buf, size_t len)
    427{
    428	struct net_device *netdev = to_net_dev(dev);
    429	struct net *net = dev_net(netdev);
    430	size_t count = len;
    431	ssize_t ret = 0;
    432
    433	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
    434		return -EPERM;
    435
    436	/* ignore trailing newline */
    437	if (len >  0 && buf[len - 1] == '\n')
    438		--count;
    439
    440	if (!rtnl_trylock())
    441		return restart_syscall();
    442
    443	if (dev_isalive(netdev)) {
    444		ret = dev_set_alias(netdev, buf, count);
    445		if (ret < 0)
    446			goto err;
    447		ret = len;
    448		netdev_state_change(netdev);
    449	}
    450err:
    451	rtnl_unlock();
    452
    453	return ret;
    454}
    455
    456static ssize_t ifalias_show(struct device *dev,
    457			    struct device_attribute *attr, char *buf)
    458{
    459	const struct net_device *netdev = to_net_dev(dev);
    460	char tmp[IFALIASZ];
    461	ssize_t ret = 0;
    462
    463	ret = dev_get_alias(netdev, tmp, sizeof(tmp));
    464	if (ret > 0)
    465		ret = sprintf(buf, "%s\n", tmp);
    466	return ret;
    467}
    468static DEVICE_ATTR_RW(ifalias);
    469
    470static int change_group(struct net_device *dev, unsigned long new_group)
    471{
    472	dev_set_group(dev, (int)new_group);
    473	return 0;
    474}
    475
    476static ssize_t group_store(struct device *dev, struct device_attribute *attr,
    477			   const char *buf, size_t len)
    478{
    479	return netdev_store(dev, attr, buf, len, change_group);
    480}
    481NETDEVICE_SHOW(group, fmt_dec);
    482static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
    483
    484static int change_proto_down(struct net_device *dev, unsigned long proto_down)
    485{
    486	return dev_change_proto_down(dev, (bool)proto_down);
    487}
    488
    489static ssize_t proto_down_store(struct device *dev,
    490				struct device_attribute *attr,
    491				const char *buf, size_t len)
    492{
    493	return netdev_store(dev, attr, buf, len, change_proto_down);
    494}
    495NETDEVICE_SHOW_RW(proto_down, fmt_dec);
    496
    497static ssize_t phys_port_id_show(struct device *dev,
    498				 struct device_attribute *attr, char *buf)
    499{
    500	struct net_device *netdev = to_net_dev(dev);
    501	ssize_t ret = -EINVAL;
    502
    503	/* The check is also done in dev_get_phys_port_id; this helps returning
    504	 * early without hitting the trylock/restart below.
    505	 */
    506	if (!netdev->netdev_ops->ndo_get_phys_port_id)
    507		return -EOPNOTSUPP;
    508
    509	if (!rtnl_trylock())
    510		return restart_syscall();
    511
    512	if (dev_isalive(netdev)) {
    513		struct netdev_phys_item_id ppid;
    514
    515		ret = dev_get_phys_port_id(netdev, &ppid);
    516		if (!ret)
    517			ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
    518	}
    519	rtnl_unlock();
    520
    521	return ret;
    522}
    523static DEVICE_ATTR_RO(phys_port_id);
    524
    525static ssize_t phys_port_name_show(struct device *dev,
    526				   struct device_attribute *attr, char *buf)
    527{
    528	struct net_device *netdev = to_net_dev(dev);
    529	ssize_t ret = -EINVAL;
    530
    531	/* The checks are also done in dev_get_phys_port_name; this helps
    532	 * returning early without hitting the trylock/restart below.
    533	 */
    534	if (!netdev->netdev_ops->ndo_get_phys_port_name &&
    535	    !netdev->netdev_ops->ndo_get_devlink_port)
    536		return -EOPNOTSUPP;
    537
    538	if (!rtnl_trylock())
    539		return restart_syscall();
    540
    541	if (dev_isalive(netdev)) {
    542		char name[IFNAMSIZ];
    543
    544		ret = dev_get_phys_port_name(netdev, name, sizeof(name));
    545		if (!ret)
    546			ret = sprintf(buf, "%s\n", name);
    547	}
    548	rtnl_unlock();
    549
    550	return ret;
    551}
    552static DEVICE_ATTR_RO(phys_port_name);
    553
    554static ssize_t phys_switch_id_show(struct device *dev,
    555				   struct device_attribute *attr, char *buf)
    556{
    557	struct net_device *netdev = to_net_dev(dev);
    558	ssize_t ret = -EINVAL;
    559
    560	/* The checks are also done in dev_get_phys_port_name; this helps
    561	 * returning early without hitting the trylock/restart below. This works
    562	 * because recurse is false when calling dev_get_port_parent_id.
    563	 */
    564	if (!netdev->netdev_ops->ndo_get_port_parent_id &&
    565	    !netdev->netdev_ops->ndo_get_devlink_port)
    566		return -EOPNOTSUPP;
    567
    568	if (!rtnl_trylock())
    569		return restart_syscall();
    570
    571	if (dev_isalive(netdev)) {
    572		struct netdev_phys_item_id ppid = { };
    573
    574		ret = dev_get_port_parent_id(netdev, &ppid, false);
    575		if (!ret)
    576			ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
    577	}
    578	rtnl_unlock();
    579
    580	return ret;
    581}
    582static DEVICE_ATTR_RO(phys_switch_id);
    583
    584static ssize_t threaded_show(struct device *dev,
    585			     struct device_attribute *attr, char *buf)
    586{
    587	struct net_device *netdev = to_net_dev(dev);
    588	ssize_t ret = -EINVAL;
    589
    590	if (!rtnl_trylock())
    591		return restart_syscall();
    592
    593	if (dev_isalive(netdev))
    594		ret = sprintf(buf, fmt_dec, netdev->threaded);
    595
    596	rtnl_unlock();
    597	return ret;
    598}
    599
    600static int modify_napi_threaded(struct net_device *dev, unsigned long val)
    601{
    602	int ret;
    603
    604	if (list_empty(&dev->napi_list))
    605		return -EOPNOTSUPP;
    606
    607	if (val != 0 && val != 1)
    608		return -EOPNOTSUPP;
    609
    610	ret = dev_set_threaded(dev, val);
    611
    612	return ret;
    613}
    614
    615static ssize_t threaded_store(struct device *dev,
    616			      struct device_attribute *attr,
    617			      const char *buf, size_t len)
    618{
    619	return netdev_store(dev, attr, buf, len, modify_napi_threaded);
    620}
    621static DEVICE_ATTR_RW(threaded);
    622
    623static struct attribute *net_class_attrs[] __ro_after_init = {
    624	&dev_attr_netdev_group.attr,
    625	&dev_attr_type.attr,
    626	&dev_attr_dev_id.attr,
    627	&dev_attr_dev_port.attr,
    628	&dev_attr_iflink.attr,
    629	&dev_attr_ifindex.attr,
    630	&dev_attr_name_assign_type.attr,
    631	&dev_attr_addr_assign_type.attr,
    632	&dev_attr_addr_len.attr,
    633	&dev_attr_link_mode.attr,
    634	&dev_attr_address.attr,
    635	&dev_attr_broadcast.attr,
    636	&dev_attr_speed.attr,
    637	&dev_attr_duplex.attr,
    638	&dev_attr_dormant.attr,
    639	&dev_attr_testing.attr,
    640	&dev_attr_operstate.attr,
    641	&dev_attr_carrier_changes.attr,
    642	&dev_attr_ifalias.attr,
    643	&dev_attr_carrier.attr,
    644	&dev_attr_mtu.attr,
    645	&dev_attr_flags.attr,
    646	&dev_attr_tx_queue_len.attr,
    647	&dev_attr_gro_flush_timeout.attr,
    648	&dev_attr_napi_defer_hard_irqs.attr,
    649	&dev_attr_phys_port_id.attr,
    650	&dev_attr_phys_port_name.attr,
    651	&dev_attr_phys_switch_id.attr,
    652	&dev_attr_proto_down.attr,
    653	&dev_attr_carrier_up_count.attr,
    654	&dev_attr_carrier_down_count.attr,
    655	&dev_attr_threaded.attr,
    656	NULL,
    657};
    658ATTRIBUTE_GROUPS(net_class);
    659
    660/* Show a given an attribute in the statistics group */
    661static ssize_t netstat_show(const struct device *d,
    662			    struct device_attribute *attr, char *buf,
    663			    unsigned long offset)
    664{
    665	struct net_device *dev = to_net_dev(d);
    666	ssize_t ret = -EINVAL;
    667
    668	WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
    669		offset % sizeof(u64) != 0);
    670
    671	read_lock(&dev_base_lock);
    672	if (dev_isalive(dev)) {
    673		struct rtnl_link_stats64 temp;
    674		const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
    675
    676		ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
    677	}
    678	read_unlock(&dev_base_lock);
    679	return ret;
    680}
    681
    682/* generate a read-only statistics attribute */
    683#define NETSTAT_ENTRY(name)						\
    684static ssize_t name##_show(struct device *d,				\
    685			   struct device_attribute *attr, char *buf)	\
    686{									\
    687	return netstat_show(d, attr, buf,				\
    688			    offsetof(struct rtnl_link_stats64, name));	\
    689}									\
    690static DEVICE_ATTR_RO(name)
    691
    692NETSTAT_ENTRY(rx_packets);
    693NETSTAT_ENTRY(tx_packets);
    694NETSTAT_ENTRY(rx_bytes);
    695NETSTAT_ENTRY(tx_bytes);
    696NETSTAT_ENTRY(rx_errors);
    697NETSTAT_ENTRY(tx_errors);
    698NETSTAT_ENTRY(rx_dropped);
    699NETSTAT_ENTRY(tx_dropped);
    700NETSTAT_ENTRY(multicast);
    701NETSTAT_ENTRY(collisions);
    702NETSTAT_ENTRY(rx_length_errors);
    703NETSTAT_ENTRY(rx_over_errors);
    704NETSTAT_ENTRY(rx_crc_errors);
    705NETSTAT_ENTRY(rx_frame_errors);
    706NETSTAT_ENTRY(rx_fifo_errors);
    707NETSTAT_ENTRY(rx_missed_errors);
    708NETSTAT_ENTRY(tx_aborted_errors);
    709NETSTAT_ENTRY(tx_carrier_errors);
    710NETSTAT_ENTRY(tx_fifo_errors);
    711NETSTAT_ENTRY(tx_heartbeat_errors);
    712NETSTAT_ENTRY(tx_window_errors);
    713NETSTAT_ENTRY(rx_compressed);
    714NETSTAT_ENTRY(tx_compressed);
    715NETSTAT_ENTRY(rx_nohandler);
    716
    717static struct attribute *netstat_attrs[] __ro_after_init = {
    718	&dev_attr_rx_packets.attr,
    719	&dev_attr_tx_packets.attr,
    720	&dev_attr_rx_bytes.attr,
    721	&dev_attr_tx_bytes.attr,
    722	&dev_attr_rx_errors.attr,
    723	&dev_attr_tx_errors.attr,
    724	&dev_attr_rx_dropped.attr,
    725	&dev_attr_tx_dropped.attr,
    726	&dev_attr_multicast.attr,
    727	&dev_attr_collisions.attr,
    728	&dev_attr_rx_length_errors.attr,
    729	&dev_attr_rx_over_errors.attr,
    730	&dev_attr_rx_crc_errors.attr,
    731	&dev_attr_rx_frame_errors.attr,
    732	&dev_attr_rx_fifo_errors.attr,
    733	&dev_attr_rx_missed_errors.attr,
    734	&dev_attr_tx_aborted_errors.attr,
    735	&dev_attr_tx_carrier_errors.attr,
    736	&dev_attr_tx_fifo_errors.attr,
    737	&dev_attr_tx_heartbeat_errors.attr,
    738	&dev_attr_tx_window_errors.attr,
    739	&dev_attr_rx_compressed.attr,
    740	&dev_attr_tx_compressed.attr,
    741	&dev_attr_rx_nohandler.attr,
    742	NULL
    743};
    744
    745static const struct attribute_group netstat_group = {
    746	.name  = "statistics",
    747	.attrs  = netstat_attrs,
    748};
    749
    750static struct attribute *wireless_attrs[] = {
    751	NULL
    752};
    753
    754static const struct attribute_group wireless_group = {
    755	.name = "wireless",
    756	.attrs = wireless_attrs,
    757};
    758
    759static bool wireless_group_needed(struct net_device *ndev)
    760{
    761#if IS_ENABLED(CONFIG_CFG80211)
    762	if (ndev->ieee80211_ptr)
    763		return true;
    764#endif
    765#if IS_ENABLED(CONFIG_WIRELESS_EXT)
    766	if (ndev->wireless_handlers)
    767		return true;
    768#endif
    769	return false;
    770}
    771
    772#else /* CONFIG_SYSFS */
    773#define net_class_groups	NULL
    774#endif /* CONFIG_SYSFS */
    775
    776#ifdef CONFIG_SYSFS
    777#define to_rx_queue_attr(_attr) \
    778	container_of(_attr, struct rx_queue_attribute, attr)
    779
    780#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
    781
    782static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
    783				  char *buf)
    784{
    785	const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
    786	struct netdev_rx_queue *queue = to_rx_queue(kobj);
    787
    788	if (!attribute->show)
    789		return -EIO;
    790
    791	return attribute->show(queue, buf);
    792}
    793
    794static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
    795				   const char *buf, size_t count)
    796{
    797	const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
    798	struct netdev_rx_queue *queue = to_rx_queue(kobj);
    799
    800	if (!attribute->store)
    801		return -EIO;
    802
    803	return attribute->store(queue, buf, count);
    804}
    805
    806static const struct sysfs_ops rx_queue_sysfs_ops = {
    807	.show = rx_queue_attr_show,
    808	.store = rx_queue_attr_store,
    809};
    810
    811#ifdef CONFIG_RPS
    812static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
    813{
    814	struct rps_map *map;
    815	cpumask_var_t mask;
    816	int i, len;
    817
    818	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
    819		return -ENOMEM;
    820
    821	rcu_read_lock();
    822	map = rcu_dereference(queue->rps_map);
    823	if (map)
    824		for (i = 0; i < map->len; i++)
    825			cpumask_set_cpu(map->cpus[i], mask);
    826
    827	len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
    828	rcu_read_unlock();
    829	free_cpumask_var(mask);
    830
    831	return len < PAGE_SIZE ? len : -EINVAL;
    832}
    833
    834static ssize_t store_rps_map(struct netdev_rx_queue *queue,
    835			     const char *buf, size_t len)
    836{
    837	struct rps_map *old_map, *map;
    838	cpumask_var_t mask;
    839	int err, cpu, i;
    840	static DEFINE_MUTEX(rps_map_mutex);
    841
    842	if (!capable(CAP_NET_ADMIN))
    843		return -EPERM;
    844
    845	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
    846		return -ENOMEM;
    847
    848	err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
    849	if (err) {
    850		free_cpumask_var(mask);
    851		return err;
    852	}
    853
    854	if (!cpumask_empty(mask)) {
    855		cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_DOMAIN));
    856		cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_WQ));
    857		if (cpumask_empty(mask)) {
    858			free_cpumask_var(mask);
    859			return -EINVAL;
    860		}
    861	}
    862
    863	map = kzalloc(max_t(unsigned int,
    864			    RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
    865		      GFP_KERNEL);
    866	if (!map) {
    867		free_cpumask_var(mask);
    868		return -ENOMEM;
    869	}
    870
    871	i = 0;
    872	for_each_cpu_and(cpu, mask, cpu_online_mask)
    873		map->cpus[i++] = cpu;
    874
    875	if (i) {
    876		map->len = i;
    877	} else {
    878		kfree(map);
    879		map = NULL;
    880	}
    881
    882	mutex_lock(&rps_map_mutex);
    883	old_map = rcu_dereference_protected(queue->rps_map,
    884					    mutex_is_locked(&rps_map_mutex));
    885	rcu_assign_pointer(queue->rps_map, map);
    886
    887	if (map)
    888		static_branch_inc(&rps_needed);
    889	if (old_map)
    890		static_branch_dec(&rps_needed);
    891
    892	mutex_unlock(&rps_map_mutex);
    893
    894	if (old_map)
    895		kfree_rcu(old_map, rcu);
    896
    897	free_cpumask_var(mask);
    898	return len;
    899}
    900
    901static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
    902					   char *buf)
    903{
    904	struct rps_dev_flow_table *flow_table;
    905	unsigned long val = 0;
    906
    907	rcu_read_lock();
    908	flow_table = rcu_dereference(queue->rps_flow_table);
    909	if (flow_table)
    910		val = (unsigned long)flow_table->mask + 1;
    911	rcu_read_unlock();
    912
    913	return sprintf(buf, "%lu\n", val);
    914}
    915
    916static void rps_dev_flow_table_release(struct rcu_head *rcu)
    917{
    918	struct rps_dev_flow_table *table = container_of(rcu,
    919	    struct rps_dev_flow_table, rcu);
    920	vfree(table);
    921}
    922
    923static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
    924					    const char *buf, size_t len)
    925{
    926	unsigned long mask, count;
    927	struct rps_dev_flow_table *table, *old_table;
    928	static DEFINE_SPINLOCK(rps_dev_flow_lock);
    929	int rc;
    930
    931	if (!capable(CAP_NET_ADMIN))
    932		return -EPERM;
    933
    934	rc = kstrtoul(buf, 0, &count);
    935	if (rc < 0)
    936		return rc;
    937
    938	if (count) {
    939		mask = count - 1;
    940		/* mask = roundup_pow_of_two(count) - 1;
    941		 * without overflows...
    942		 */
    943		while ((mask | (mask >> 1)) != mask)
    944			mask |= (mask >> 1);
    945		/* On 64 bit arches, must check mask fits in table->mask (u32),
    946		 * and on 32bit arches, must check
    947		 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
    948		 */
    949#if BITS_PER_LONG > 32
    950		if (mask > (unsigned long)(u32)mask)
    951			return -EINVAL;
    952#else
    953		if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
    954				/ sizeof(struct rps_dev_flow)) {
    955			/* Enforce a limit to prevent overflow */
    956			return -EINVAL;
    957		}
    958#endif
    959		table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
    960		if (!table)
    961			return -ENOMEM;
    962
    963		table->mask = mask;
    964		for (count = 0; count <= mask; count++)
    965			table->flows[count].cpu = RPS_NO_CPU;
    966	} else {
    967		table = NULL;
    968	}
    969
    970	spin_lock(&rps_dev_flow_lock);
    971	old_table = rcu_dereference_protected(queue->rps_flow_table,
    972					      lockdep_is_held(&rps_dev_flow_lock));
    973	rcu_assign_pointer(queue->rps_flow_table, table);
    974	spin_unlock(&rps_dev_flow_lock);
    975
    976	if (old_table)
    977		call_rcu(&old_table->rcu, rps_dev_flow_table_release);
    978
    979	return len;
    980}
    981
    982static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
    983	= __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
    984
    985static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
    986	= __ATTR(rps_flow_cnt, 0644,
    987		 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
    988#endif /* CONFIG_RPS */
    989
    990static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
    991#ifdef CONFIG_RPS
    992	&rps_cpus_attribute.attr,
    993	&rps_dev_flow_table_cnt_attribute.attr,
    994#endif
    995	NULL
    996};
    997ATTRIBUTE_GROUPS(rx_queue_default);
    998
    999static void rx_queue_release(struct kobject *kobj)
   1000{
   1001	struct netdev_rx_queue *queue = to_rx_queue(kobj);
   1002#ifdef CONFIG_RPS
   1003	struct rps_map *map;
   1004	struct rps_dev_flow_table *flow_table;
   1005
   1006	map = rcu_dereference_protected(queue->rps_map, 1);
   1007	if (map) {
   1008		RCU_INIT_POINTER(queue->rps_map, NULL);
   1009		kfree_rcu(map, rcu);
   1010	}
   1011
   1012	flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
   1013	if (flow_table) {
   1014		RCU_INIT_POINTER(queue->rps_flow_table, NULL);
   1015		call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
   1016	}
   1017#endif
   1018
   1019	memset(kobj, 0, sizeof(*kobj));
   1020	dev_put_track(queue->dev, &queue->dev_tracker);
   1021}
   1022
   1023static const void *rx_queue_namespace(struct kobject *kobj)
   1024{
   1025	struct netdev_rx_queue *queue = to_rx_queue(kobj);
   1026	struct device *dev = &queue->dev->dev;
   1027	const void *ns = NULL;
   1028
   1029	if (dev->class && dev->class->ns_type)
   1030		ns = dev->class->namespace(dev);
   1031
   1032	return ns;
   1033}
   1034
   1035static void rx_queue_get_ownership(struct kobject *kobj,
   1036				   kuid_t *uid, kgid_t *gid)
   1037{
   1038	const struct net *net = rx_queue_namespace(kobj);
   1039
   1040	net_ns_get_ownership(net, uid, gid);
   1041}
   1042
   1043static struct kobj_type rx_queue_ktype __ro_after_init = {
   1044	.sysfs_ops = &rx_queue_sysfs_ops,
   1045	.release = rx_queue_release,
   1046	.default_groups = rx_queue_default_groups,
   1047	.namespace = rx_queue_namespace,
   1048	.get_ownership = rx_queue_get_ownership,
   1049};
   1050
   1051static int rx_queue_add_kobject(struct net_device *dev, int index)
   1052{
   1053	struct netdev_rx_queue *queue = dev->_rx + index;
   1054	struct kobject *kobj = &queue->kobj;
   1055	int error = 0;
   1056
   1057	/* Kobject_put later will trigger rx_queue_release call which
   1058	 * decreases dev refcount: Take that reference here
   1059	 */
   1060	dev_hold_track(queue->dev, &queue->dev_tracker, GFP_KERNEL);
   1061
   1062	kobj->kset = dev->queues_kset;
   1063	error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
   1064				     "rx-%u", index);
   1065	if (error)
   1066		goto err;
   1067
   1068	if (dev->sysfs_rx_queue_group) {
   1069		error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
   1070		if (error)
   1071			goto err;
   1072	}
   1073
   1074	kobject_uevent(kobj, KOBJ_ADD);
   1075
   1076	return error;
   1077
   1078err:
   1079	kobject_put(kobj);
   1080	return error;
   1081}
   1082
   1083static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
   1084				 kgid_t kgid)
   1085{
   1086	struct netdev_rx_queue *queue = dev->_rx + index;
   1087	struct kobject *kobj = &queue->kobj;
   1088	int error;
   1089
   1090	error = sysfs_change_owner(kobj, kuid, kgid);
   1091	if (error)
   1092		return error;
   1093
   1094	if (dev->sysfs_rx_queue_group)
   1095		error = sysfs_group_change_owner(
   1096			kobj, dev->sysfs_rx_queue_group, kuid, kgid);
   1097
   1098	return error;
   1099}
   1100#endif /* CONFIG_SYSFS */
   1101
   1102int
   1103net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
   1104{
   1105#ifdef CONFIG_SYSFS
   1106	int i;
   1107	int error = 0;
   1108
   1109#ifndef CONFIG_RPS
   1110	if (!dev->sysfs_rx_queue_group)
   1111		return 0;
   1112#endif
   1113	for (i = old_num; i < new_num; i++) {
   1114		error = rx_queue_add_kobject(dev, i);
   1115		if (error) {
   1116			new_num = old_num;
   1117			break;
   1118		}
   1119	}
   1120
   1121	while (--i >= new_num) {
   1122		struct kobject *kobj = &dev->_rx[i].kobj;
   1123
   1124		if (!refcount_read(&dev_net(dev)->ns.count))
   1125			kobj->uevent_suppress = 1;
   1126		if (dev->sysfs_rx_queue_group)
   1127			sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
   1128		kobject_put(kobj);
   1129	}
   1130
   1131	return error;
   1132#else
   1133	return 0;
   1134#endif
   1135}
   1136
   1137static int net_rx_queue_change_owner(struct net_device *dev, int num,
   1138				     kuid_t kuid, kgid_t kgid)
   1139{
   1140#ifdef CONFIG_SYSFS
   1141	int error = 0;
   1142	int i;
   1143
   1144#ifndef CONFIG_RPS
   1145	if (!dev->sysfs_rx_queue_group)
   1146		return 0;
   1147#endif
   1148	for (i = 0; i < num; i++) {
   1149		error = rx_queue_change_owner(dev, i, kuid, kgid);
   1150		if (error)
   1151			break;
   1152	}
   1153
   1154	return error;
   1155#else
   1156	return 0;
   1157#endif
   1158}
   1159
   1160#ifdef CONFIG_SYSFS
   1161/*
   1162 * netdev_queue sysfs structures and functions.
   1163 */
   1164struct netdev_queue_attribute {
   1165	struct attribute attr;
   1166	ssize_t (*show)(struct netdev_queue *queue, char *buf);
   1167	ssize_t (*store)(struct netdev_queue *queue,
   1168			 const char *buf, size_t len);
   1169};
   1170#define to_netdev_queue_attr(_attr) \
   1171	container_of(_attr, struct netdev_queue_attribute, attr)
   1172
   1173#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
   1174
   1175static ssize_t netdev_queue_attr_show(struct kobject *kobj,
   1176				      struct attribute *attr, char *buf)
   1177{
   1178	const struct netdev_queue_attribute *attribute
   1179		= to_netdev_queue_attr(attr);
   1180	struct netdev_queue *queue = to_netdev_queue(kobj);
   1181
   1182	if (!attribute->show)
   1183		return -EIO;
   1184
   1185	return attribute->show(queue, buf);
   1186}
   1187
   1188static ssize_t netdev_queue_attr_store(struct kobject *kobj,
   1189				       struct attribute *attr,
   1190				       const char *buf, size_t count)
   1191{
   1192	const struct netdev_queue_attribute *attribute
   1193		= to_netdev_queue_attr(attr);
   1194	struct netdev_queue *queue = to_netdev_queue(kobj);
   1195
   1196	if (!attribute->store)
   1197		return -EIO;
   1198
   1199	return attribute->store(queue, buf, count);
   1200}
   1201
   1202static const struct sysfs_ops netdev_queue_sysfs_ops = {
   1203	.show = netdev_queue_attr_show,
   1204	.store = netdev_queue_attr_store,
   1205};
   1206
   1207static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
   1208{
   1209	unsigned long trans_timeout = atomic_long_read(&queue->trans_timeout);
   1210
   1211	return sprintf(buf, fmt_ulong, trans_timeout);
   1212}
   1213
   1214static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
   1215{
   1216	struct net_device *dev = queue->dev;
   1217	unsigned int i;
   1218
   1219	i = queue - dev->_tx;
   1220	BUG_ON(i >= dev->num_tx_queues);
   1221
   1222	return i;
   1223}
   1224
   1225static ssize_t traffic_class_show(struct netdev_queue *queue,
   1226				  char *buf)
   1227{
   1228	struct net_device *dev = queue->dev;
   1229	int num_tc, tc;
   1230	int index;
   1231
   1232	if (!netif_is_multiqueue(dev))
   1233		return -ENOENT;
   1234
   1235	if (!rtnl_trylock())
   1236		return restart_syscall();
   1237
   1238	index = get_netdev_queue_index(queue);
   1239
   1240	/* If queue belongs to subordinate dev use its TC mapping */
   1241	dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
   1242
   1243	num_tc = dev->num_tc;
   1244	tc = netdev_txq_to_tc(dev, index);
   1245
   1246	rtnl_unlock();
   1247
   1248	if (tc < 0)
   1249		return -EINVAL;
   1250
   1251	/* We can report the traffic class one of two ways:
   1252	 * Subordinate device traffic classes are reported with the traffic
   1253	 * class first, and then the subordinate class so for example TC0 on
   1254	 * subordinate device 2 will be reported as "0-2". If the queue
   1255	 * belongs to the root device it will be reported with just the
   1256	 * traffic class, so just "0" for TC 0 for example.
   1257	 */
   1258	return num_tc < 0 ? sprintf(buf, "%d%d\n", tc, num_tc) :
   1259			    sprintf(buf, "%d\n", tc);
   1260}
   1261
   1262#ifdef CONFIG_XPS
   1263static ssize_t tx_maxrate_show(struct netdev_queue *queue,
   1264			       char *buf)
   1265{
   1266	return sprintf(buf, "%lu\n", queue->tx_maxrate);
   1267}
   1268
   1269static ssize_t tx_maxrate_store(struct netdev_queue *queue,
   1270				const char *buf, size_t len)
   1271{
   1272	struct net_device *dev = queue->dev;
   1273	int err, index = get_netdev_queue_index(queue);
   1274	u32 rate = 0;
   1275
   1276	if (!capable(CAP_NET_ADMIN))
   1277		return -EPERM;
   1278
   1279	/* The check is also done later; this helps returning early without
   1280	 * hitting the trylock/restart below.
   1281	 */
   1282	if (!dev->netdev_ops->ndo_set_tx_maxrate)
   1283		return -EOPNOTSUPP;
   1284
   1285	err = kstrtou32(buf, 10, &rate);
   1286	if (err < 0)
   1287		return err;
   1288
   1289	if (!rtnl_trylock())
   1290		return restart_syscall();
   1291
   1292	err = -EOPNOTSUPP;
   1293	if (dev->netdev_ops->ndo_set_tx_maxrate)
   1294		err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
   1295
   1296	rtnl_unlock();
   1297	if (!err) {
   1298		queue->tx_maxrate = rate;
   1299		return len;
   1300	}
   1301	return err;
   1302}
   1303
   1304static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
   1305	= __ATTR_RW(tx_maxrate);
   1306#endif
   1307
   1308static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
   1309	= __ATTR_RO(tx_timeout);
   1310
   1311static struct netdev_queue_attribute queue_traffic_class __ro_after_init
   1312	= __ATTR_RO(traffic_class);
   1313
   1314#ifdef CONFIG_BQL
   1315/*
   1316 * Byte queue limits sysfs structures and functions.
   1317 */
   1318static ssize_t bql_show(char *buf, unsigned int value)
   1319{
   1320	return sprintf(buf, "%u\n", value);
   1321}
   1322
   1323static ssize_t bql_set(const char *buf, const size_t count,
   1324		       unsigned int *pvalue)
   1325{
   1326	unsigned int value;
   1327	int err;
   1328
   1329	if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
   1330		value = DQL_MAX_LIMIT;
   1331	} else {
   1332		err = kstrtouint(buf, 10, &value);
   1333		if (err < 0)
   1334			return err;
   1335		if (value > DQL_MAX_LIMIT)
   1336			return -EINVAL;
   1337	}
   1338
   1339	*pvalue = value;
   1340
   1341	return count;
   1342}
   1343
   1344static ssize_t bql_show_hold_time(struct netdev_queue *queue,
   1345				  char *buf)
   1346{
   1347	struct dql *dql = &queue->dql;
   1348
   1349	return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
   1350}
   1351
   1352static ssize_t bql_set_hold_time(struct netdev_queue *queue,
   1353				 const char *buf, size_t len)
   1354{
   1355	struct dql *dql = &queue->dql;
   1356	unsigned int value;
   1357	int err;
   1358
   1359	err = kstrtouint(buf, 10, &value);
   1360	if (err < 0)
   1361		return err;
   1362
   1363	dql->slack_hold_time = msecs_to_jiffies(value);
   1364
   1365	return len;
   1366}
   1367
   1368static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
   1369	= __ATTR(hold_time, 0644,
   1370		 bql_show_hold_time, bql_set_hold_time);
   1371
   1372static ssize_t bql_show_inflight(struct netdev_queue *queue,
   1373				 char *buf)
   1374{
   1375	struct dql *dql = &queue->dql;
   1376
   1377	return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
   1378}
   1379
   1380static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
   1381	__ATTR(inflight, 0444, bql_show_inflight, NULL);
   1382
   1383#define BQL_ATTR(NAME, FIELD)						\
   1384static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,		\
   1385				 char *buf)				\
   1386{									\
   1387	return bql_show(buf, queue->dql.FIELD);				\
   1388}									\
   1389									\
   1390static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,		\
   1391				const char *buf, size_t len)		\
   1392{									\
   1393	return bql_set(buf, len, &queue->dql.FIELD);			\
   1394}									\
   1395									\
   1396static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
   1397	= __ATTR(NAME, 0644,				\
   1398		 bql_show_ ## NAME, bql_set_ ## NAME)
   1399
   1400BQL_ATTR(limit, limit);
   1401BQL_ATTR(limit_max, max_limit);
   1402BQL_ATTR(limit_min, min_limit);
   1403
   1404static struct attribute *dql_attrs[] __ro_after_init = {
   1405	&bql_limit_attribute.attr,
   1406	&bql_limit_max_attribute.attr,
   1407	&bql_limit_min_attribute.attr,
   1408	&bql_hold_time_attribute.attr,
   1409	&bql_inflight_attribute.attr,
   1410	NULL
   1411};
   1412
   1413static const struct attribute_group dql_group = {
   1414	.name  = "byte_queue_limits",
   1415	.attrs  = dql_attrs,
   1416};
   1417#endif /* CONFIG_BQL */
   1418
   1419#ifdef CONFIG_XPS
   1420static ssize_t xps_queue_show(struct net_device *dev, unsigned int index,
   1421			      int tc, char *buf, enum xps_map_type type)
   1422{
   1423	struct xps_dev_maps *dev_maps;
   1424	unsigned long *mask;
   1425	unsigned int nr_ids;
   1426	int j, len;
   1427
   1428	rcu_read_lock();
   1429	dev_maps = rcu_dereference(dev->xps_maps[type]);
   1430
   1431	/* Default to nr_cpu_ids/dev->num_rx_queues and do not just return 0
   1432	 * when dev_maps hasn't been allocated yet, to be backward compatible.
   1433	 */
   1434	nr_ids = dev_maps ? dev_maps->nr_ids :
   1435		 (type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues);
   1436
   1437	mask = bitmap_zalloc(nr_ids, GFP_NOWAIT);
   1438	if (!mask) {
   1439		rcu_read_unlock();
   1440		return -ENOMEM;
   1441	}
   1442
   1443	if (!dev_maps || tc >= dev_maps->num_tc)
   1444		goto out_no_maps;
   1445
   1446	for (j = 0; j < nr_ids; j++) {
   1447		int i, tci = j * dev_maps->num_tc + tc;
   1448		struct xps_map *map;
   1449
   1450		map = rcu_dereference(dev_maps->attr_map[tci]);
   1451		if (!map)
   1452			continue;
   1453
   1454		for (i = map->len; i--;) {
   1455			if (map->queues[i] == index) {
   1456				__set_bit(j, mask);
   1457				break;
   1458			}
   1459		}
   1460	}
   1461out_no_maps:
   1462	rcu_read_unlock();
   1463
   1464	len = bitmap_print_to_pagebuf(false, buf, mask, nr_ids);
   1465	bitmap_free(mask);
   1466
   1467	return len < PAGE_SIZE ? len : -EINVAL;
   1468}
   1469
   1470static ssize_t xps_cpus_show(struct netdev_queue *queue, char *buf)
   1471{
   1472	struct net_device *dev = queue->dev;
   1473	unsigned int index;
   1474	int len, tc;
   1475
   1476	if (!netif_is_multiqueue(dev))
   1477		return -ENOENT;
   1478
   1479	index = get_netdev_queue_index(queue);
   1480
   1481	if (!rtnl_trylock())
   1482		return restart_syscall();
   1483
   1484	/* If queue belongs to subordinate dev use its map */
   1485	dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
   1486
   1487	tc = netdev_txq_to_tc(dev, index);
   1488	if (tc < 0) {
   1489		rtnl_unlock();
   1490		return -EINVAL;
   1491	}
   1492
   1493	/* Make sure the subordinate device can't be freed */
   1494	get_device(&dev->dev);
   1495	rtnl_unlock();
   1496
   1497	len = xps_queue_show(dev, index, tc, buf, XPS_CPUS);
   1498
   1499	put_device(&dev->dev);
   1500	return len;
   1501}
   1502
   1503static ssize_t xps_cpus_store(struct netdev_queue *queue,
   1504			      const char *buf, size_t len)
   1505{
   1506	struct net_device *dev = queue->dev;
   1507	unsigned int index;
   1508	cpumask_var_t mask;
   1509	int err;
   1510
   1511	if (!netif_is_multiqueue(dev))
   1512		return -ENOENT;
   1513
   1514	if (!capable(CAP_NET_ADMIN))
   1515		return -EPERM;
   1516
   1517	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
   1518		return -ENOMEM;
   1519
   1520	index = get_netdev_queue_index(queue);
   1521
   1522	err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
   1523	if (err) {
   1524		free_cpumask_var(mask);
   1525		return err;
   1526	}
   1527
   1528	if (!rtnl_trylock()) {
   1529		free_cpumask_var(mask);
   1530		return restart_syscall();
   1531	}
   1532
   1533	err = netif_set_xps_queue(dev, mask, index);
   1534	rtnl_unlock();
   1535
   1536	free_cpumask_var(mask);
   1537
   1538	return err ? : len;
   1539}
   1540
   1541static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
   1542	= __ATTR_RW(xps_cpus);
   1543
   1544static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
   1545{
   1546	struct net_device *dev = queue->dev;
   1547	unsigned int index;
   1548	int tc;
   1549
   1550	index = get_netdev_queue_index(queue);
   1551
   1552	if (!rtnl_trylock())
   1553		return restart_syscall();
   1554
   1555	tc = netdev_txq_to_tc(dev, index);
   1556	rtnl_unlock();
   1557	if (tc < 0)
   1558		return -EINVAL;
   1559
   1560	return xps_queue_show(dev, index, tc, buf, XPS_RXQS);
   1561}
   1562
   1563static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
   1564			      size_t len)
   1565{
   1566	struct net_device *dev = queue->dev;
   1567	struct net *net = dev_net(dev);
   1568	unsigned long *mask;
   1569	unsigned int index;
   1570	int err;
   1571
   1572	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
   1573		return -EPERM;
   1574
   1575	mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
   1576	if (!mask)
   1577		return -ENOMEM;
   1578
   1579	index = get_netdev_queue_index(queue);
   1580
   1581	err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
   1582	if (err) {
   1583		bitmap_free(mask);
   1584		return err;
   1585	}
   1586
   1587	if (!rtnl_trylock()) {
   1588		bitmap_free(mask);
   1589		return restart_syscall();
   1590	}
   1591
   1592	cpus_read_lock();
   1593	err = __netif_set_xps_queue(dev, mask, index, XPS_RXQS);
   1594	cpus_read_unlock();
   1595
   1596	rtnl_unlock();
   1597
   1598	bitmap_free(mask);
   1599	return err ? : len;
   1600}
   1601
   1602static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
   1603	= __ATTR_RW(xps_rxqs);
   1604#endif /* CONFIG_XPS */
   1605
   1606static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
   1607	&queue_trans_timeout.attr,
   1608	&queue_traffic_class.attr,
   1609#ifdef CONFIG_XPS
   1610	&xps_cpus_attribute.attr,
   1611	&xps_rxqs_attribute.attr,
   1612	&queue_tx_maxrate.attr,
   1613#endif
   1614	NULL
   1615};
   1616ATTRIBUTE_GROUPS(netdev_queue_default);
   1617
   1618static void netdev_queue_release(struct kobject *kobj)
   1619{
   1620	struct netdev_queue *queue = to_netdev_queue(kobj);
   1621
   1622	memset(kobj, 0, sizeof(*kobj));
   1623	dev_put_track(queue->dev, &queue->dev_tracker);
   1624}
   1625
   1626static const void *netdev_queue_namespace(struct kobject *kobj)
   1627{
   1628	struct netdev_queue *queue = to_netdev_queue(kobj);
   1629	struct device *dev = &queue->dev->dev;
   1630	const void *ns = NULL;
   1631
   1632	if (dev->class && dev->class->ns_type)
   1633		ns = dev->class->namespace(dev);
   1634
   1635	return ns;
   1636}
   1637
   1638static void netdev_queue_get_ownership(struct kobject *kobj,
   1639				       kuid_t *uid, kgid_t *gid)
   1640{
   1641	const struct net *net = netdev_queue_namespace(kobj);
   1642
   1643	net_ns_get_ownership(net, uid, gid);
   1644}
   1645
   1646static struct kobj_type netdev_queue_ktype __ro_after_init = {
   1647	.sysfs_ops = &netdev_queue_sysfs_ops,
   1648	.release = netdev_queue_release,
   1649	.default_groups = netdev_queue_default_groups,
   1650	.namespace = netdev_queue_namespace,
   1651	.get_ownership = netdev_queue_get_ownership,
   1652};
   1653
   1654static int netdev_queue_add_kobject(struct net_device *dev, int index)
   1655{
   1656	struct netdev_queue *queue = dev->_tx + index;
   1657	struct kobject *kobj = &queue->kobj;
   1658	int error = 0;
   1659
   1660	/* Kobject_put later will trigger netdev_queue_release call
   1661	 * which decreases dev refcount: Take that reference here
   1662	 */
   1663	dev_hold_track(queue->dev, &queue->dev_tracker, GFP_KERNEL);
   1664
   1665	kobj->kset = dev->queues_kset;
   1666	error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
   1667				     "tx-%u", index);
   1668	if (error)
   1669		goto err;
   1670
   1671#ifdef CONFIG_BQL
   1672	error = sysfs_create_group(kobj, &dql_group);
   1673	if (error)
   1674		goto err;
   1675#endif
   1676
   1677	kobject_uevent(kobj, KOBJ_ADD);
   1678	return 0;
   1679
   1680err:
   1681	kobject_put(kobj);
   1682	return error;
   1683}
   1684
   1685static int tx_queue_change_owner(struct net_device *ndev, int index,
   1686				 kuid_t kuid, kgid_t kgid)
   1687{
   1688	struct netdev_queue *queue = ndev->_tx + index;
   1689	struct kobject *kobj = &queue->kobj;
   1690	int error;
   1691
   1692	error = sysfs_change_owner(kobj, kuid, kgid);
   1693	if (error)
   1694		return error;
   1695
   1696#ifdef CONFIG_BQL
   1697	error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
   1698#endif
   1699	return error;
   1700}
   1701#endif /* CONFIG_SYSFS */
   1702
   1703int
   1704netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
   1705{
   1706#ifdef CONFIG_SYSFS
   1707	int i;
   1708	int error = 0;
   1709
   1710	/* Tx queue kobjects are allowed to be updated when a device is being
   1711	 * unregistered, but solely to remove queues from qdiscs. Any path
   1712	 * adding queues should be fixed.
   1713	 */
   1714	WARN(dev->reg_state == NETREG_UNREGISTERING && new_num > old_num,
   1715	     "New queues can't be registered after device unregistration.");
   1716
   1717	for (i = old_num; i < new_num; i++) {
   1718		error = netdev_queue_add_kobject(dev, i);
   1719		if (error) {
   1720			new_num = old_num;
   1721			break;
   1722		}
   1723	}
   1724
   1725	while (--i >= new_num) {
   1726		struct netdev_queue *queue = dev->_tx + i;
   1727
   1728		if (!refcount_read(&dev_net(dev)->ns.count))
   1729			queue->kobj.uevent_suppress = 1;
   1730#ifdef CONFIG_BQL
   1731		sysfs_remove_group(&queue->kobj, &dql_group);
   1732#endif
   1733		kobject_put(&queue->kobj);
   1734	}
   1735
   1736	return error;
   1737#else
   1738	return 0;
   1739#endif /* CONFIG_SYSFS */
   1740}
   1741
   1742static int net_tx_queue_change_owner(struct net_device *dev, int num,
   1743				     kuid_t kuid, kgid_t kgid)
   1744{
   1745#ifdef CONFIG_SYSFS
   1746	int error = 0;
   1747	int i;
   1748
   1749	for (i = 0; i < num; i++) {
   1750		error = tx_queue_change_owner(dev, i, kuid, kgid);
   1751		if (error)
   1752			break;
   1753	}
   1754
   1755	return error;
   1756#else
   1757	return 0;
   1758#endif /* CONFIG_SYSFS */
   1759}
   1760
   1761static int register_queue_kobjects(struct net_device *dev)
   1762{
   1763	int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
   1764
   1765#ifdef CONFIG_SYSFS
   1766	dev->queues_kset = kset_create_and_add("queues",
   1767					       NULL, &dev->dev.kobj);
   1768	if (!dev->queues_kset)
   1769		return -ENOMEM;
   1770	real_rx = dev->real_num_rx_queues;
   1771#endif
   1772	real_tx = dev->real_num_tx_queues;
   1773
   1774	error = net_rx_queue_update_kobjects(dev, 0, real_rx);
   1775	if (error)
   1776		goto error;
   1777	rxq = real_rx;
   1778
   1779	error = netdev_queue_update_kobjects(dev, 0, real_tx);
   1780	if (error)
   1781		goto error;
   1782	txq = real_tx;
   1783
   1784	return 0;
   1785
   1786error:
   1787	netdev_queue_update_kobjects(dev, txq, 0);
   1788	net_rx_queue_update_kobjects(dev, rxq, 0);
   1789#ifdef CONFIG_SYSFS
   1790	kset_unregister(dev->queues_kset);
   1791#endif
   1792	return error;
   1793}
   1794
   1795static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
   1796{
   1797	int error = 0, real_rx = 0, real_tx = 0;
   1798
   1799#ifdef CONFIG_SYSFS
   1800	if (ndev->queues_kset) {
   1801		error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
   1802		if (error)
   1803			return error;
   1804	}
   1805	real_rx = ndev->real_num_rx_queues;
   1806#endif
   1807	real_tx = ndev->real_num_tx_queues;
   1808
   1809	error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
   1810	if (error)
   1811		return error;
   1812
   1813	error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
   1814	if (error)
   1815		return error;
   1816
   1817	return 0;
   1818}
   1819
   1820static void remove_queue_kobjects(struct net_device *dev)
   1821{
   1822	int real_rx = 0, real_tx = 0;
   1823
   1824#ifdef CONFIG_SYSFS
   1825	real_rx = dev->real_num_rx_queues;
   1826#endif
   1827	real_tx = dev->real_num_tx_queues;
   1828
   1829	net_rx_queue_update_kobjects(dev, real_rx, 0);
   1830	netdev_queue_update_kobjects(dev, real_tx, 0);
   1831
   1832	dev->real_num_rx_queues = 0;
   1833	dev->real_num_tx_queues = 0;
   1834#ifdef CONFIG_SYSFS
   1835	kset_unregister(dev->queues_kset);
   1836#endif
   1837}
   1838
   1839static bool net_current_may_mount(void)
   1840{
   1841	struct net *net = current->nsproxy->net_ns;
   1842
   1843	return ns_capable(net->user_ns, CAP_SYS_ADMIN);
   1844}
   1845
   1846static void *net_grab_current_ns(void)
   1847{
   1848	struct net *ns = current->nsproxy->net_ns;
   1849#ifdef CONFIG_NET_NS
   1850	if (ns)
   1851		refcount_inc(&ns->passive);
   1852#endif
   1853	return ns;
   1854}
   1855
   1856static const void *net_initial_ns(void)
   1857{
   1858	return &init_net;
   1859}
   1860
   1861static const void *net_netlink_ns(struct sock *sk)
   1862{
   1863	return sock_net(sk);
   1864}
   1865
   1866const struct kobj_ns_type_operations net_ns_type_operations = {
   1867	.type = KOBJ_NS_TYPE_NET,
   1868	.current_may_mount = net_current_may_mount,
   1869	.grab_current_ns = net_grab_current_ns,
   1870	.netlink_ns = net_netlink_ns,
   1871	.initial_ns = net_initial_ns,
   1872	.drop_ns = net_drop_ns,
   1873};
   1874EXPORT_SYMBOL_GPL(net_ns_type_operations);
   1875
   1876static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
   1877{
   1878	struct net_device *dev = to_net_dev(d);
   1879	int retval;
   1880
   1881	/* pass interface to uevent. */
   1882	retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
   1883	if (retval)
   1884		goto exit;
   1885
   1886	/* pass ifindex to uevent.
   1887	 * ifindex is useful as it won't change (interface name may change)
   1888	 * and is what RtNetlink uses natively.
   1889	 */
   1890	retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
   1891
   1892exit:
   1893	return retval;
   1894}
   1895
   1896/*
   1897 *	netdev_release -- destroy and free a dead device.
   1898 *	Called when last reference to device kobject is gone.
   1899 */
   1900static void netdev_release(struct device *d)
   1901{
   1902	struct net_device *dev = to_net_dev(d);
   1903
   1904	BUG_ON(dev->reg_state != NETREG_RELEASED);
   1905
   1906	/* no need to wait for rcu grace period:
   1907	 * device is dead and about to be freed.
   1908	 */
   1909	kfree(rcu_access_pointer(dev->ifalias));
   1910	netdev_freemem(dev);
   1911}
   1912
   1913static const void *net_namespace(struct device *d)
   1914{
   1915	struct net_device *dev = to_net_dev(d);
   1916
   1917	return dev_net(dev);
   1918}
   1919
   1920static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
   1921{
   1922	struct net_device *dev = to_net_dev(d);
   1923	const struct net *net = dev_net(dev);
   1924
   1925	net_ns_get_ownership(net, uid, gid);
   1926}
   1927
   1928static struct class net_class __ro_after_init = {
   1929	.name = "net",
   1930	.dev_release = netdev_release,
   1931	.dev_groups = net_class_groups,
   1932	.dev_uevent = netdev_uevent,
   1933	.ns_type = &net_ns_type_operations,
   1934	.namespace = net_namespace,
   1935	.get_ownership = net_get_ownership,
   1936};
   1937
   1938#ifdef CONFIG_OF
   1939static int of_dev_node_match(struct device *dev, const void *data)
   1940{
   1941	for (; dev; dev = dev->parent) {
   1942		if (dev->of_node == data)
   1943			return 1;
   1944	}
   1945
   1946	return 0;
   1947}
   1948
   1949/*
   1950 * of_find_net_device_by_node - lookup the net device for the device node
   1951 * @np: OF device node
   1952 *
   1953 * Looks up the net_device structure corresponding with the device node.
   1954 * If successful, returns a pointer to the net_device with the embedded
   1955 * struct device refcount incremented by one, or NULL on failure. The
   1956 * refcount must be dropped when done with the net_device.
   1957 */
   1958struct net_device *of_find_net_device_by_node(struct device_node *np)
   1959{
   1960	struct device *dev;
   1961
   1962	dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
   1963	if (!dev)
   1964		return NULL;
   1965
   1966	return to_net_dev(dev);
   1967}
   1968EXPORT_SYMBOL(of_find_net_device_by_node);
   1969#endif
   1970
   1971/* Delete sysfs entries but hold kobject reference until after all
   1972 * netdev references are gone.
   1973 */
   1974void netdev_unregister_kobject(struct net_device *ndev)
   1975{
   1976	struct device *dev = &ndev->dev;
   1977
   1978	if (!refcount_read(&dev_net(ndev)->ns.count))
   1979		dev_set_uevent_suppress(dev, 1);
   1980
   1981	kobject_get(&dev->kobj);
   1982
   1983	remove_queue_kobjects(ndev);
   1984
   1985	pm_runtime_set_memalloc_noio(dev, false);
   1986
   1987	device_del(dev);
   1988}
   1989
   1990/* Create sysfs entries for network device. */
   1991int netdev_register_kobject(struct net_device *ndev)
   1992{
   1993	struct device *dev = &ndev->dev;
   1994	const struct attribute_group **groups = ndev->sysfs_groups;
   1995	int error = 0;
   1996
   1997	device_initialize(dev);
   1998	dev->class = &net_class;
   1999	dev->platform_data = ndev;
   2000	dev->groups = groups;
   2001
   2002	dev_set_name(dev, "%s", ndev->name);
   2003
   2004#ifdef CONFIG_SYSFS
   2005	/* Allow for a device specific group */
   2006	if (*groups)
   2007		groups++;
   2008
   2009	*groups++ = &netstat_group;
   2010
   2011	if (wireless_group_needed(ndev))
   2012		*groups++ = &wireless_group;
   2013#endif /* CONFIG_SYSFS */
   2014
   2015	error = device_add(dev);
   2016	if (error)
   2017		return error;
   2018
   2019	error = register_queue_kobjects(ndev);
   2020	if (error) {
   2021		device_del(dev);
   2022		return error;
   2023	}
   2024
   2025	pm_runtime_set_memalloc_noio(dev, true);
   2026
   2027	return error;
   2028}
   2029
   2030/* Change owner for sysfs entries when moving network devices across network
   2031 * namespaces owned by different user namespaces.
   2032 */
   2033int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
   2034			const struct net *net_new)
   2035{
   2036	kuid_t old_uid = GLOBAL_ROOT_UID, new_uid = GLOBAL_ROOT_UID;
   2037	kgid_t old_gid = GLOBAL_ROOT_GID, new_gid = GLOBAL_ROOT_GID;
   2038	struct device *dev = &ndev->dev;
   2039	int error;
   2040
   2041	net_ns_get_ownership(net_old, &old_uid, &old_gid);
   2042	net_ns_get_ownership(net_new, &new_uid, &new_gid);
   2043
   2044	/* The network namespace was changed but the owning user namespace is
   2045	 * identical so there's no need to change the owner of sysfs entries.
   2046	 */
   2047	if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid))
   2048		return 0;
   2049
   2050	error = device_change_owner(dev, new_uid, new_gid);
   2051	if (error)
   2052		return error;
   2053
   2054	error = queue_change_owner(ndev, new_uid, new_gid);
   2055	if (error)
   2056		return error;
   2057
   2058	return 0;
   2059}
   2060
   2061int netdev_class_create_file_ns(const struct class_attribute *class_attr,
   2062				const void *ns)
   2063{
   2064	return class_create_file_ns(&net_class, class_attr, ns);
   2065}
   2066EXPORT_SYMBOL(netdev_class_create_file_ns);
   2067
   2068void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
   2069				 const void *ns)
   2070{
   2071	class_remove_file_ns(&net_class, class_attr, ns);
   2072}
   2073EXPORT_SYMBOL(netdev_class_remove_file_ns);
   2074
   2075int __init netdev_kobject_init(void)
   2076{
   2077	kobj_ns_type_register(&net_ns_type_operations);
   2078	return class_register(&net_class);
   2079}