Linux Audio

Check our new training course

Loading...
v3.15
   1/*
   2 * net-sysfs.c - network device class and attributes
   3 *
   4 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
   5 *
   6 *	This program is free software; you can redistribute it and/or
   7 *	modify it under the terms of the GNU General Public License
   8 *	as published by the Free Software Foundation; either version
   9 *	2 of the License, or (at your option) any later version.
  10 */
  11
  12#include <linux/capability.h>
  13#include <linux/kernel.h>
  14#include <linux/netdevice.h>
 
  15#include <linux/if_arp.h>
  16#include <linux/slab.h>
 
  17#include <linux/nsproxy.h>
  18#include <net/sock.h>
  19#include <net/net_namespace.h>
  20#include <linux/rtnetlink.h>
  21#include <linux/vmalloc.h>
  22#include <linux/export.h>
  23#include <linux/jiffies.h>
  24#include <linux/pm_runtime.h>
 
 
  25
  26#include "net-sysfs.h"
  27
  28#ifdef CONFIG_SYSFS
  29static const char fmt_hex[] = "%#x\n";
  30static const char fmt_long_hex[] = "%#lx\n";
  31static const char fmt_dec[] = "%d\n";
  32static const char fmt_udec[] = "%u\n";
  33static const char fmt_ulong[] = "%lu\n";
  34static const char fmt_u64[] = "%llu\n";
  35
  36static inline int dev_isalive(const struct net_device *dev)
  37{
  38	return dev->reg_state <= NETREG_REGISTERED;
  39}
  40
  41/* use same locking rules as GIF* ioctl's */
  42static ssize_t netdev_show(const struct device *dev,
  43			   struct device_attribute *attr, char *buf,
  44			   ssize_t (*format)(const struct net_device *, char *))
  45{
  46	struct net_device *net = to_net_dev(dev);
  47	ssize_t ret = -EINVAL;
  48
  49	read_lock(&dev_base_lock);
  50	if (dev_isalive(net))
  51		ret = (*format)(net, buf);
  52	read_unlock(&dev_base_lock);
  53
  54	return ret;
  55}
  56
  57/* generate a show function for simple field */
  58#define NETDEVICE_SHOW(field, format_string)				\
  59static ssize_t format_##field(const struct net_device *net, char *buf)	\
  60{									\
  61	return sprintf(buf, format_string, net->field);			\
  62}									\
  63static ssize_t field##_show(struct device *dev,				\
  64			    struct device_attribute *attr, char *buf)	\
  65{									\
  66	return netdev_show(dev, attr, buf, format_##field);		\
  67}									\
  68
  69#define NETDEVICE_SHOW_RO(field, format_string)				\
  70NETDEVICE_SHOW(field, format_string);					\
  71static DEVICE_ATTR_RO(field)
  72
  73#define NETDEVICE_SHOW_RW(field, format_string)				\
  74NETDEVICE_SHOW(field, format_string);					\
  75static DEVICE_ATTR_RW(field)
  76
  77/* use same locking and permission rules as SIF* ioctl's */
  78static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  79			    const char *buf, size_t len,
  80			    int (*set)(struct net_device *, unsigned long))
  81{
  82	struct net_device *netdev = to_net_dev(dev);
  83	struct net *net = dev_net(netdev);
  84	unsigned long new;
  85	int ret = -EINVAL;
  86
  87	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  88		return -EPERM;
  89
  90	ret = kstrtoul(buf, 0, &new);
  91	if (ret)
  92		goto err;
  93
  94	if (!rtnl_trylock())
  95		return restart_syscall();
  96
  97	if (dev_isalive(netdev)) {
  98		if ((ret = (*set)(netdev, new)) == 0)
 
  99			ret = len;
 100	}
 101	rtnl_unlock();
 102 err:
 103	return ret;
 104}
 105
 106NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 107NETDEVICE_SHOW_RO(dev_port, fmt_dec);
 108NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 109NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 110NETDEVICE_SHOW_RO(iflink, fmt_dec);
 111NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 112NETDEVICE_SHOW_RO(type, fmt_dec);
 113NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 114
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 115/* use same locking rules as GIFHWADDR ioctl's */
 116static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 117			    char *buf)
 118{
 119	struct net_device *net = to_net_dev(dev);
 120	ssize_t ret = -EINVAL;
 121
 122	read_lock(&dev_base_lock);
 123	if (dev_isalive(net))
 124		ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
 125	read_unlock(&dev_base_lock);
 126	return ret;
 127}
 128static DEVICE_ATTR_RO(address);
 129
 130static ssize_t broadcast_show(struct device *dev,
 131			      struct device_attribute *attr, char *buf)
 132{
 133	struct net_device *net = to_net_dev(dev);
 134	if (dev_isalive(net))
 135		return sysfs_format_mac(buf, net->broadcast, net->addr_len);
 
 136	return -EINVAL;
 137}
 138static DEVICE_ATTR_RO(broadcast);
 139
 140static int change_carrier(struct net_device *net, unsigned long new_carrier)
 141{
 142	if (!netif_running(net))
 143		return -EINVAL;
 144	return dev_change_carrier(net, (bool) new_carrier);
 145}
 146
 147static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 148			     const char *buf, size_t len)
 149{
 150	return netdev_store(dev, attr, buf, len, change_carrier);
 151}
 152
 153static ssize_t carrier_show(struct device *dev,
 154			    struct device_attribute *attr, char *buf)
 155{
 156	struct net_device *netdev = to_net_dev(dev);
 157	if (netif_running(netdev)) {
 
 158		return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 159	}
 160	return -EINVAL;
 161}
 162static DEVICE_ATTR_RW(carrier);
 163
 164static ssize_t speed_show(struct device *dev,
 165			  struct device_attribute *attr, char *buf)
 166{
 167	struct net_device *netdev = to_net_dev(dev);
 168	int ret = -EINVAL;
 169
 170	if (!rtnl_trylock())
 171		return restart_syscall();
 172
 173	if (netif_running(netdev)) {
 174		struct ethtool_cmd cmd;
 175		if (!__ethtool_get_settings(netdev, &cmd))
 176			ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
 
 177	}
 178	rtnl_unlock();
 179	return ret;
 180}
 181static DEVICE_ATTR_RO(speed);
 182
 183static ssize_t duplex_show(struct device *dev,
 184			   struct device_attribute *attr, char *buf)
 185{
 186	struct net_device *netdev = to_net_dev(dev);
 187	int ret = -EINVAL;
 188
 189	if (!rtnl_trylock())
 190		return restart_syscall();
 191
 192	if (netif_running(netdev)) {
 193		struct ethtool_cmd cmd;
 194		if (!__ethtool_get_settings(netdev, &cmd)) {
 
 195			const char *duplex;
 196			switch (cmd.duplex) {
 
 197			case DUPLEX_HALF:
 198				duplex = "half";
 199				break;
 200			case DUPLEX_FULL:
 201				duplex = "full";
 202				break;
 203			default:
 204				duplex = "unknown";
 205				break;
 206			}
 207			ret = sprintf(buf, "%s\n", duplex);
 208		}
 209	}
 210	rtnl_unlock();
 211	return ret;
 212}
 213static DEVICE_ATTR_RO(duplex);
 214
 215static ssize_t dormant_show(struct device *dev,
 216			    struct device_attribute *attr, char *buf)
 217{
 218	struct net_device *netdev = to_net_dev(dev);
 219
 220	if (netif_running(netdev))
 221		return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 222
 223	return -EINVAL;
 224}
 225static DEVICE_ATTR_RO(dormant);
 226
 227static const char *const operstates[] = {
 228	"unknown",
 229	"notpresent", /* currently unused */
 230	"down",
 231	"lowerlayerdown",
 232	"testing", /* currently unused */
 233	"dormant",
 234	"up"
 235};
 236
 237static ssize_t operstate_show(struct device *dev,
 238			      struct device_attribute *attr, char *buf)
 239{
 240	const struct net_device *netdev = to_net_dev(dev);
 241	unsigned char operstate;
 242
 243	read_lock(&dev_base_lock);
 244	operstate = netdev->operstate;
 245	if (!netif_running(netdev))
 246		operstate = IF_OPER_DOWN;
 247	read_unlock(&dev_base_lock);
 248
 249	if (operstate >= ARRAY_SIZE(operstates))
 250		return -EINVAL; /* should not happen */
 251
 252	return sprintf(buf, "%s\n", operstates[operstate]);
 253}
 254static DEVICE_ATTR_RO(operstate);
 255
 256static ssize_t carrier_changes_show(struct device *dev,
 257				    struct device_attribute *attr,
 258				    char *buf)
 259{
 260	struct net_device *netdev = to_net_dev(dev);
 
 261	return sprintf(buf, fmt_dec,
 262		       atomic_read(&netdev->carrier_changes));
 
 263}
 264static DEVICE_ATTR_RO(carrier_changes);
 265
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 266/* read-write attributes */
 267
 268static int change_mtu(struct net_device *net, unsigned long new_mtu)
 269{
 270	return dev_set_mtu(net, (int) new_mtu);
 271}
 272
 273static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 274			 const char *buf, size_t len)
 275{
 276	return netdev_store(dev, attr, buf, len, change_mtu);
 277}
 278NETDEVICE_SHOW_RW(mtu, fmt_dec);
 279
 280static int change_flags(struct net_device *net, unsigned long new_flags)
 281{
 282	return dev_change_flags(net, (unsigned int) new_flags);
 283}
 284
 285static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 286			   const char *buf, size_t len)
 287{
 288	return netdev_store(dev, attr, buf, len, change_flags);
 289}
 290NETDEVICE_SHOW_RW(flags, fmt_hex);
 291
 292static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
 
 
 
 
 
 
 
 
 
 
 
 293{
 294	net->tx_queue_len = new_len;
 295	return 0;
 296}
 297
 298static ssize_t tx_queue_len_store(struct device *dev,
 299				  struct device_attribute *attr,
 300				  const char *buf, size_t len)
 301{
 302	if (!capable(CAP_NET_ADMIN))
 303		return -EPERM;
 304
 305	return netdev_store(dev, attr, buf, len, change_tx_queue_len);
 306}
 307NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
 308
 309static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 310			     const char *buf, size_t len)
 311{
 312	struct net_device *netdev = to_net_dev(dev);
 313	struct net *net = dev_net(netdev);
 314	size_t count = len;
 315	ssize_t ret;
 316
 317	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 318		return -EPERM;
 319
 320	/* ignore trailing newline */
 321	if (len >  0 && buf[len - 1] == '\n')
 322		--count;
 323
 324	if (!rtnl_trylock())
 325		return restart_syscall();
 326	ret = dev_set_alias(netdev, buf, count);
 
 
 
 
 
 
 
 
 327	rtnl_unlock();
 328
 329	return ret < 0 ? ret : len;
 330}
 331
 332static ssize_t ifalias_show(struct device *dev,
 333			    struct device_attribute *attr, char *buf)
 334{
 335	const struct net_device *netdev = to_net_dev(dev);
 
 336	ssize_t ret = 0;
 337
 338	if (!rtnl_trylock())
 339		return restart_syscall();
 340	if (netdev->ifalias)
 341		ret = sprintf(buf, "%s\n", netdev->ifalias);
 342	rtnl_unlock();
 343	return ret;
 344}
 345static DEVICE_ATTR_RW(ifalias);
 346
 347static int change_group(struct net_device *net, unsigned long new_group)
 348{
 349	dev_set_group(net, (int) new_group);
 350	return 0;
 351}
 352
 353static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 354			   const char *buf, size_t len)
 355{
 356	return netdev_store(dev, attr, buf, len, change_group);
 357}
 358NETDEVICE_SHOW(group, fmt_dec);
 359static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
 
 
 
 
 
 
 
 
 
 
 
 
 
 360
 361static ssize_t phys_port_id_show(struct device *dev,
 362				 struct device_attribute *attr, char *buf)
 363{
 364	struct net_device *netdev = to_net_dev(dev);
 365	ssize_t ret = -EINVAL;
 366
 367	if (!rtnl_trylock())
 368		return restart_syscall();
 369
 370	if (dev_isalive(netdev)) {
 371		struct netdev_phys_port_id ppid;
 372
 373		ret = dev_get_phys_port_id(netdev, &ppid);
 374		if (!ret)
 375			ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 376	}
 377	rtnl_unlock();
 378
 379	return ret;
 380}
 381static DEVICE_ATTR_RO(phys_port_id);
 382
 383static struct attribute *net_class_attrs[] = {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 384	&dev_attr_netdev_group.attr,
 385	&dev_attr_type.attr,
 386	&dev_attr_dev_id.attr,
 387	&dev_attr_dev_port.attr,
 388	&dev_attr_iflink.attr,
 389	&dev_attr_ifindex.attr,
 
 390	&dev_attr_addr_assign_type.attr,
 391	&dev_attr_addr_len.attr,
 392	&dev_attr_link_mode.attr,
 393	&dev_attr_address.attr,
 394	&dev_attr_broadcast.attr,
 395	&dev_attr_speed.attr,
 396	&dev_attr_duplex.attr,
 397	&dev_attr_dormant.attr,
 398	&dev_attr_operstate.attr,
 399	&dev_attr_carrier_changes.attr,
 400	&dev_attr_ifalias.attr,
 401	&dev_attr_carrier.attr,
 402	&dev_attr_mtu.attr,
 403	&dev_attr_flags.attr,
 404	&dev_attr_tx_queue_len.attr,
 
 405	&dev_attr_phys_port_id.attr,
 
 
 
 
 
 406	NULL,
 407};
 408ATTRIBUTE_GROUPS(net_class);
 409
 410/* Show a given an attribute in the statistics group */
 411static ssize_t netstat_show(const struct device *d,
 412			    struct device_attribute *attr, char *buf,
 413			    unsigned long offset)
 414{
 415	struct net_device *dev = to_net_dev(d);
 416	ssize_t ret = -EINVAL;
 417
 418	WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 419			offset % sizeof(u64) != 0);
 420
 421	read_lock(&dev_base_lock);
 422	if (dev_isalive(dev)) {
 423		struct rtnl_link_stats64 temp;
 424		const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 425
 426		ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
 427	}
 428	read_unlock(&dev_base_lock);
 429	return ret;
 430}
 431
 432/* generate a read-only statistics attribute */
 433#define NETSTAT_ENTRY(name)						\
 434static ssize_t name##_show(struct device *d,				\
 435			   struct device_attribute *attr, char *buf) 	\
 436{									\
 437	return netstat_show(d, attr, buf,				\
 438			    offsetof(struct rtnl_link_stats64, name));	\
 439}									\
 440static DEVICE_ATTR_RO(name)
 441
 442NETSTAT_ENTRY(rx_packets);
 443NETSTAT_ENTRY(tx_packets);
 444NETSTAT_ENTRY(rx_bytes);
 445NETSTAT_ENTRY(tx_bytes);
 446NETSTAT_ENTRY(rx_errors);
 447NETSTAT_ENTRY(tx_errors);
 448NETSTAT_ENTRY(rx_dropped);
 449NETSTAT_ENTRY(tx_dropped);
 450NETSTAT_ENTRY(multicast);
 451NETSTAT_ENTRY(collisions);
 452NETSTAT_ENTRY(rx_length_errors);
 453NETSTAT_ENTRY(rx_over_errors);
 454NETSTAT_ENTRY(rx_crc_errors);
 455NETSTAT_ENTRY(rx_frame_errors);
 456NETSTAT_ENTRY(rx_fifo_errors);
 457NETSTAT_ENTRY(rx_missed_errors);
 458NETSTAT_ENTRY(tx_aborted_errors);
 459NETSTAT_ENTRY(tx_carrier_errors);
 460NETSTAT_ENTRY(tx_fifo_errors);
 461NETSTAT_ENTRY(tx_heartbeat_errors);
 462NETSTAT_ENTRY(tx_window_errors);
 463NETSTAT_ENTRY(rx_compressed);
 464NETSTAT_ENTRY(tx_compressed);
 
 465
 466static struct attribute *netstat_attrs[] = {
 467	&dev_attr_rx_packets.attr,
 468	&dev_attr_tx_packets.attr,
 469	&dev_attr_rx_bytes.attr,
 470	&dev_attr_tx_bytes.attr,
 471	&dev_attr_rx_errors.attr,
 472	&dev_attr_tx_errors.attr,
 473	&dev_attr_rx_dropped.attr,
 474	&dev_attr_tx_dropped.attr,
 475	&dev_attr_multicast.attr,
 476	&dev_attr_collisions.attr,
 477	&dev_attr_rx_length_errors.attr,
 478	&dev_attr_rx_over_errors.attr,
 479	&dev_attr_rx_crc_errors.attr,
 480	&dev_attr_rx_frame_errors.attr,
 481	&dev_attr_rx_fifo_errors.attr,
 482	&dev_attr_rx_missed_errors.attr,
 483	&dev_attr_tx_aborted_errors.attr,
 484	&dev_attr_tx_carrier_errors.attr,
 485	&dev_attr_tx_fifo_errors.attr,
 486	&dev_attr_tx_heartbeat_errors.attr,
 487	&dev_attr_tx_window_errors.attr,
 488	&dev_attr_rx_compressed.attr,
 489	&dev_attr_tx_compressed.attr,
 
 490	NULL
 491};
 492
 493
 494static struct attribute_group netstat_group = {
 495	.name  = "statistics",
 496	.attrs  = netstat_attrs,
 497};
 498
 499#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 500static struct attribute *wireless_attrs[] = {
 501	NULL
 502};
 503
 504static struct attribute_group wireless_group = {
 505	.name = "wireless",
 506	.attrs = wireless_attrs,
 507};
 508#endif
 509
 510#else /* CONFIG_SYSFS */
 511#define net_class_groups	NULL
 512#endif /* CONFIG_SYSFS */
 513
 514#ifdef CONFIG_SYSFS
 515#define to_rx_queue_attr(_attr) container_of(_attr,		\
 516    struct rx_queue_attribute, attr)
 517
 518#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 519
 520static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 521				  char *buf)
 522{
 523	struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 524	struct netdev_rx_queue *queue = to_rx_queue(kobj);
 525
 526	if (!attribute->show)
 527		return -EIO;
 528
 529	return attribute->show(queue, attribute, buf);
 530}
 531
 532static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 533				   const char *buf, size_t count)
 534{
 535	struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 536	struct netdev_rx_queue *queue = to_rx_queue(kobj);
 537
 538	if (!attribute->store)
 539		return -EIO;
 540
 541	return attribute->store(queue, attribute, buf, count);
 542}
 543
 544static const struct sysfs_ops rx_queue_sysfs_ops = {
 545	.show = rx_queue_attr_show,
 546	.store = rx_queue_attr_store,
 547};
 548
 549#ifdef CONFIG_RPS
 550static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 551			    struct rx_queue_attribute *attribute, char *buf)
 552{
 553	struct rps_map *map;
 554	cpumask_var_t mask;
 555	size_t len = 0;
 556	int i;
 557
 558	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 559		return -ENOMEM;
 560
 561	rcu_read_lock();
 562	map = rcu_dereference(queue->rps_map);
 563	if (map)
 564		for (i = 0; i < map->len; i++)
 565			cpumask_set_cpu(map->cpus[i], mask);
 566
 567	len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 568	if (PAGE_SIZE - len < 3) {
 569		rcu_read_unlock();
 570		free_cpumask_var(mask);
 571		return -EINVAL;
 572	}
 573	rcu_read_unlock();
 574
 575	free_cpumask_var(mask);
 576	len += sprintf(buf + len, "\n");
 577	return len;
 578}
 579
 580static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 581		      struct rx_queue_attribute *attribute,
 582		      const char *buf, size_t len)
 583{
 584	struct rps_map *old_map, *map;
 585	cpumask_var_t mask;
 586	int err, cpu, i;
 587	static DEFINE_SPINLOCK(rps_map_lock);
 588
 589	if (!capable(CAP_NET_ADMIN))
 590		return -EPERM;
 591
 592	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 593		return -ENOMEM;
 594
 595	err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 596	if (err) {
 597		free_cpumask_var(mask);
 598		return err;
 599	}
 600
 601	map = kzalloc(max_t(unsigned int,
 602	    RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 603	    GFP_KERNEL);
 604	if (!map) {
 605		free_cpumask_var(mask);
 606		return -ENOMEM;
 607	}
 608
 609	i = 0;
 610	for_each_cpu_and(cpu, mask, cpu_online_mask)
 611		map->cpus[i++] = cpu;
 612
 613	if (i)
 614		map->len = i;
 615	else {
 616		kfree(map);
 617		map = NULL;
 618	}
 619
 620	spin_lock(&rps_map_lock);
 621	old_map = rcu_dereference_protected(queue->rps_map,
 622					    lockdep_is_held(&rps_map_lock));
 623	rcu_assign_pointer(queue->rps_map, map);
 624	spin_unlock(&rps_map_lock);
 625
 626	if (map)
 627		static_key_slow_inc(&rps_needed);
 628	if (old_map) {
 629		kfree_rcu(old_map, rcu);
 630		static_key_slow_dec(&rps_needed);
 631	}
 
 
 
 
 
 632	free_cpumask_var(mask);
 633	return len;
 634}
 635
 636static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 637					   struct rx_queue_attribute *attr,
 638					   char *buf)
 639{
 640	struct rps_dev_flow_table *flow_table;
 641	unsigned long val = 0;
 642
 643	rcu_read_lock();
 644	flow_table = rcu_dereference(queue->rps_flow_table);
 645	if (flow_table)
 646		val = (unsigned long)flow_table->mask + 1;
 647	rcu_read_unlock();
 648
 649	return sprintf(buf, "%lu\n", val);
 650}
 651
 652static void rps_dev_flow_table_release(struct rcu_head *rcu)
 653{
 654	struct rps_dev_flow_table *table = container_of(rcu,
 655	    struct rps_dev_flow_table, rcu);
 656	vfree(table);
 657}
 658
 659static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 660				     struct rx_queue_attribute *attr,
 661				     const char *buf, size_t len)
 662{
 663	unsigned long mask, count;
 664	struct rps_dev_flow_table *table, *old_table;
 665	static DEFINE_SPINLOCK(rps_dev_flow_lock);
 666	int rc;
 667
 668	if (!capable(CAP_NET_ADMIN))
 669		return -EPERM;
 670
 671	rc = kstrtoul(buf, 0, &count);
 672	if (rc < 0)
 673		return rc;
 674
 675	if (count) {
 676		mask = count - 1;
 677		/* mask = roundup_pow_of_two(count) - 1;
 678		 * without overflows...
 679		 */
 680		while ((mask | (mask >> 1)) != mask)
 681			mask |= (mask >> 1);
 682		/* On 64 bit arches, must check mask fits in table->mask (u32),
 683		 * and on 32bit arches, must check
 684		 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 685		 */
 686#if BITS_PER_LONG > 32
 687		if (mask > (unsigned long)(u32)mask)
 688			return -EINVAL;
 689#else
 690		if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 691				/ sizeof(struct rps_dev_flow)) {
 692			/* Enforce a limit to prevent overflow */
 693			return -EINVAL;
 694		}
 695#endif
 696		table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 697		if (!table)
 698			return -ENOMEM;
 699
 700		table->mask = mask;
 701		for (count = 0; count <= mask; count++)
 702			table->flows[count].cpu = RPS_NO_CPU;
 703	} else
 704		table = NULL;
 
 705
 706	spin_lock(&rps_dev_flow_lock);
 707	old_table = rcu_dereference_protected(queue->rps_flow_table,
 708					      lockdep_is_held(&rps_dev_flow_lock));
 709	rcu_assign_pointer(queue->rps_flow_table, table);
 710	spin_unlock(&rps_dev_flow_lock);
 711
 712	if (old_table)
 713		call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 714
 715	return len;
 716}
 717
 718static struct rx_queue_attribute rps_cpus_attribute =
 719	__ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 720
 721
 722static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 723	__ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 724	    show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 725#endif /* CONFIG_RPS */
 726
 727static struct attribute *rx_queue_default_attrs[] = {
 728#ifdef CONFIG_RPS
 729	&rps_cpus_attribute.attr,
 730	&rps_dev_flow_table_cnt_attribute.attr,
 731#endif
 732	NULL
 733};
 734
 735static void rx_queue_release(struct kobject *kobj)
 736{
 737	struct netdev_rx_queue *queue = to_rx_queue(kobj);
 738#ifdef CONFIG_RPS
 739	struct rps_map *map;
 740	struct rps_dev_flow_table *flow_table;
 741
 742
 743	map = rcu_dereference_protected(queue->rps_map, 1);
 744	if (map) {
 745		RCU_INIT_POINTER(queue->rps_map, NULL);
 746		kfree_rcu(map, rcu);
 747	}
 748
 749	flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 750	if (flow_table) {
 751		RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 752		call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 753	}
 754#endif
 755
 756	memset(kobj, 0, sizeof(*kobj));
 757	dev_put(queue->dev);
 758}
 759
 760static const void *rx_queue_namespace(struct kobject *kobj)
 761{
 762	struct netdev_rx_queue *queue = to_rx_queue(kobj);
 763	struct device *dev = &queue->dev->dev;
 764	const void *ns = NULL;
 765
 766	if (dev->class && dev->class->ns_type)
 767		ns = dev->class->namespace(dev);
 768
 769	return ns;
 770}
 771
 772static struct kobj_type rx_queue_ktype = {
 773	.sysfs_ops = &rx_queue_sysfs_ops,
 774	.release = rx_queue_release,
 775	.default_attrs = rx_queue_default_attrs,
 776	.namespace = rx_queue_namespace
 777};
 778
 779static int rx_queue_add_kobject(struct net_device *net, int index)
 780{
 781	struct netdev_rx_queue *queue = net->_rx + index;
 782	struct kobject *kobj = &queue->kobj;
 783	int error = 0;
 784
 785	kobj->kset = net->queues_kset;
 786	error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 787	    "rx-%u", index);
 788	if (error)
 789		goto exit;
 790
 791	if (net->sysfs_rx_queue_group) {
 792		error = sysfs_create_group(kobj, net->sysfs_rx_queue_group);
 793		if (error)
 794			goto exit;
 
 
 795	}
 796
 797	kobject_uevent(kobj, KOBJ_ADD);
 798	dev_hold(queue->dev);
 799
 800	return error;
 801exit:
 802	kobject_put(kobj);
 803	return error;
 804}
 805#endif /* CONFIG_SYSFS */
 806
 807int
 808net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
 809{
 810#ifdef CONFIG_SYSFS
 811	int i;
 812	int error = 0;
 813
 814#ifndef CONFIG_RPS
 815	if (!net->sysfs_rx_queue_group)
 816		return 0;
 817#endif
 818	for (i = old_num; i < new_num; i++) {
 819		error = rx_queue_add_kobject(net, i);
 820		if (error) {
 821			new_num = old_num;
 822			break;
 823		}
 824	}
 825
 826	while (--i >= new_num) {
 827		if (net->sysfs_rx_queue_group)
 828			sysfs_remove_group(&net->_rx[i].kobj,
 829					   net->sysfs_rx_queue_group);
 830		kobject_put(&net->_rx[i].kobj);
 
 
 
 831	}
 832
 833	return error;
 834#else
 835	return 0;
 836#endif
 837}
 838
 839#ifdef CONFIG_SYSFS
 840/*
 841 * netdev_queue sysfs structures and functions.
 842 */
 843struct netdev_queue_attribute {
 844	struct attribute attr;
 845	ssize_t (*show)(struct netdev_queue *queue,
 846	    struct netdev_queue_attribute *attr, char *buf);
 847	ssize_t (*store)(struct netdev_queue *queue,
 848	    struct netdev_queue_attribute *attr, const char *buf, size_t len);
 849};
 850#define to_netdev_queue_attr(_attr) container_of(_attr,		\
 851    struct netdev_queue_attribute, attr)
 852
 853#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 854
 855static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 856				      struct attribute *attr, char *buf)
 857{
 858	struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 
 859	struct netdev_queue *queue = to_netdev_queue(kobj);
 860
 861	if (!attribute->show)
 862		return -EIO;
 863
 864	return attribute->show(queue, attribute, buf);
 865}
 866
 867static ssize_t netdev_queue_attr_store(struct kobject *kobj,
 868				       struct attribute *attr,
 869				       const char *buf, size_t count)
 870{
 871	struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 
 872	struct netdev_queue *queue = to_netdev_queue(kobj);
 873
 874	if (!attribute->store)
 875		return -EIO;
 876
 877	return attribute->store(queue, attribute, buf, count);
 878}
 879
 880static const struct sysfs_ops netdev_queue_sysfs_ops = {
 881	.show = netdev_queue_attr_show,
 882	.store = netdev_queue_attr_store,
 883};
 884
 885static ssize_t show_trans_timeout(struct netdev_queue *queue,
 886				  struct netdev_queue_attribute *attribute,
 887				  char *buf)
 888{
 889	unsigned long trans_timeout;
 890
 891	spin_lock_irq(&queue->_xmit_lock);
 892	trans_timeout = queue->trans_timeout;
 893	spin_unlock_irq(&queue->_xmit_lock);
 894
 895	return sprintf(buf, "%lu", trans_timeout);
 896}
 897
 898static struct netdev_queue_attribute queue_trans_timeout =
 899	__ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 900
 901#ifdef CONFIG_BQL
 902/*
 903 * Byte queue limits sysfs structures and functions.
 904 */
 905static ssize_t bql_show(char *buf, unsigned int value)
 906{
 907	return sprintf(buf, "%u\n", value);
 908}
 909
 910static ssize_t bql_set(const char *buf, const size_t count,
 911		       unsigned int *pvalue)
 912{
 913	unsigned int value;
 914	int err;
 915
 916	if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
 917		value = DQL_MAX_LIMIT;
 918	else {
 919		err = kstrtouint(buf, 10, &value);
 920		if (err < 0)
 921			return err;
 922		if (value > DQL_MAX_LIMIT)
 923			return -EINVAL;
 924	}
 925
 926	*pvalue = value;
 927
 928	return count;
 929}
 930
 931static ssize_t bql_show_hold_time(struct netdev_queue *queue,
 932				  struct netdev_queue_attribute *attr,
 933				  char *buf)
 934{
 935	struct dql *dql = &queue->dql;
 936
 937	return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
 938}
 939
 940static ssize_t bql_set_hold_time(struct netdev_queue *queue,
 941				 struct netdev_queue_attribute *attribute,
 942				 const char *buf, size_t len)
 943{
 944	struct dql *dql = &queue->dql;
 945	unsigned int value;
 946	int err;
 947
 948	err = kstrtouint(buf, 10, &value);
 949	if (err < 0)
 950		return err;
 951
 952	dql->slack_hold_time = msecs_to_jiffies(value);
 953
 954	return len;
 955}
 956
 957static struct netdev_queue_attribute bql_hold_time_attribute =
 958	__ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
 959	    bql_set_hold_time);
 960
 961static ssize_t bql_show_inflight(struct netdev_queue *queue,
 962				 struct netdev_queue_attribute *attr,
 963				 char *buf)
 964{
 965	struct dql *dql = &queue->dql;
 966
 967	return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
 968}
 969
 970static struct netdev_queue_attribute bql_inflight_attribute =
 971	__ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
 972
 973#define BQL_ATTR(NAME, FIELD)						\
 974static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,		\
 975				 struct netdev_queue_attribute *attr,	\
 976				 char *buf)				\
 977{									\
 978	return bql_show(buf, queue->dql.FIELD);				\
 979}									\
 980									\
 981static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,		\
 982				struct netdev_queue_attribute *attr,	\
 983				const char *buf, size_t len)		\
 984{									\
 985	return bql_set(buf, len, &queue->dql.FIELD);			\
 986}									\
 987									\
 988static struct netdev_queue_attribute bql_ ## NAME ## _attribute =	\
 989	__ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME,		\
 990	    bql_set_ ## NAME);
 991
 992BQL_ATTR(limit, limit)
 993BQL_ATTR(limit_max, max_limit)
 994BQL_ATTR(limit_min, min_limit)
 995
 996static struct attribute *dql_attrs[] = {
 997	&bql_limit_attribute.attr,
 998	&bql_limit_max_attribute.attr,
 999	&bql_limit_min_attribute.attr,
1000	&bql_hold_time_attribute.attr,
1001	&bql_inflight_attribute.attr,
1002	NULL
1003};
1004
1005static struct attribute_group dql_group = {
1006	.name  = "byte_queue_limits",
1007	.attrs  = dql_attrs,
1008};
1009#endif /* CONFIG_BQL */
1010
1011#ifdef CONFIG_XPS
1012static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1013{
1014	struct net_device *dev = queue->dev;
1015	unsigned int i;
1016
1017	i = queue - dev->_tx;
1018	BUG_ON(i >= dev->num_tx_queues);
1019
1020	return i;
1021}
1022
1023
1024static ssize_t show_xps_map(struct netdev_queue *queue,
1025			    struct netdev_queue_attribute *attribute, char *buf)
1026{
1027	struct net_device *dev = queue->dev;
 
1028	struct xps_dev_maps *dev_maps;
1029	cpumask_var_t mask;
1030	unsigned long index;
1031	size_t len = 0;
1032	int i;
 
 
 
 
 
 
 
1033
1034	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1035		return -ENOMEM;
1036
1037	index = get_netdev_queue_index(queue);
1038
1039	rcu_read_lock();
1040	dev_maps = rcu_dereference(dev->xps_maps);
1041	if (dev_maps) {
1042		for_each_possible_cpu(i) {
1043			struct xps_map *map =
1044			    rcu_dereference(dev_maps->cpu_map[i]);
1045			if (map) {
1046				int j;
1047				for (j = 0; j < map->len; j++) {
1048					if (map->queues[j] == index) {
1049						cpumask_set_cpu(i, mask);
1050						break;
1051					}
 
 
1052				}
1053			}
1054		}
1055	}
1056	rcu_read_unlock();
1057
1058	len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
1059	if (PAGE_SIZE - len < 3) {
1060		free_cpumask_var(mask);
1061		return -EINVAL;
1062	}
1063
1064	free_cpumask_var(mask);
1065	len += sprintf(buf + len, "\n");
1066	return len;
1067}
1068
1069static ssize_t store_xps_map(struct netdev_queue *queue,
1070		      struct netdev_queue_attribute *attribute,
1071		      const char *buf, size_t len)
1072{
1073	struct net_device *dev = queue->dev;
1074	unsigned long index;
1075	cpumask_var_t mask;
1076	int err;
1077
1078	if (!capable(CAP_NET_ADMIN))
1079		return -EPERM;
1080
1081	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1082		return -ENOMEM;
1083
1084	index = get_netdev_queue_index(queue);
1085
1086	err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1087	if (err) {
1088		free_cpumask_var(mask);
1089		return err;
1090	}
1091
1092	err = netif_set_xps_queue(dev, mask, index);
1093
1094	free_cpumask_var(mask);
1095
1096	return err ? : len;
1097}
1098
1099static struct netdev_queue_attribute xps_cpus_attribute =
1100    __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1101#endif /* CONFIG_XPS */
1102
1103static struct attribute *netdev_queue_default_attrs[] = {
1104	&queue_trans_timeout.attr,
 
1105#ifdef CONFIG_XPS
1106	&xps_cpus_attribute.attr,
 
1107#endif
1108	NULL
1109};
1110
1111static void netdev_queue_release(struct kobject *kobj)
1112{
1113	struct netdev_queue *queue = to_netdev_queue(kobj);
1114
1115	memset(kobj, 0, sizeof(*kobj));
1116	dev_put(queue->dev);
1117}
1118
1119static const void *netdev_queue_namespace(struct kobject *kobj)
1120{
1121	struct netdev_queue *queue = to_netdev_queue(kobj);
1122	struct device *dev = &queue->dev->dev;
1123	const void *ns = NULL;
1124
1125	if (dev->class && dev->class->ns_type)
1126		ns = dev->class->namespace(dev);
1127
1128	return ns;
1129}
1130
1131static struct kobj_type netdev_queue_ktype = {
1132	.sysfs_ops = &netdev_queue_sysfs_ops,
1133	.release = netdev_queue_release,
1134	.default_attrs = netdev_queue_default_attrs,
1135	.namespace = netdev_queue_namespace,
1136};
1137
1138static int netdev_queue_add_kobject(struct net_device *net, int index)
1139{
1140	struct netdev_queue *queue = net->_tx + index;
1141	struct kobject *kobj = &queue->kobj;
1142	int error = 0;
1143
1144	kobj->kset = net->queues_kset;
1145	error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1146	    "tx-%u", index);
1147	if (error)
1148		goto exit;
1149
1150#ifdef CONFIG_BQL
1151	error = sysfs_create_group(kobj, &dql_group);
1152	if (error)
1153		goto exit;
 
 
1154#endif
1155
1156	kobject_uevent(kobj, KOBJ_ADD);
1157	dev_hold(queue->dev);
1158
1159	return 0;
1160exit:
1161	kobject_put(kobj);
1162	return error;
1163}
1164#endif /* CONFIG_SYSFS */
1165
1166int
1167netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1168{
1169#ifdef CONFIG_SYSFS
1170	int i;
1171	int error = 0;
1172
1173	for (i = old_num; i < new_num; i++) {
1174		error = netdev_queue_add_kobject(net, i);
1175		if (error) {
1176			new_num = old_num;
1177			break;
1178		}
1179	}
1180
1181	while (--i >= new_num) {
1182		struct netdev_queue *queue = net->_tx + i;
1183
 
 
1184#ifdef CONFIG_BQL
1185		sysfs_remove_group(&queue->kobj, &dql_group);
1186#endif
1187		kobject_put(&queue->kobj);
1188	}
1189
1190	return error;
1191#else
1192	return 0;
1193#endif /* CONFIG_SYSFS */
1194}
1195
1196static int register_queue_kobjects(struct net_device *net)
1197{
1198	int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1199
1200#ifdef CONFIG_SYSFS
1201	net->queues_kset = kset_create_and_add("queues",
1202	    NULL, &net->dev.kobj);
1203	if (!net->queues_kset)
1204		return -ENOMEM;
1205	real_rx = net->real_num_rx_queues;
1206#endif
1207	real_tx = net->real_num_tx_queues;
1208
1209	error = net_rx_queue_update_kobjects(net, 0, real_rx);
1210	if (error)
1211		goto error;
1212	rxq = real_rx;
1213
1214	error = netdev_queue_update_kobjects(net, 0, real_tx);
1215	if (error)
1216		goto error;
1217	txq = real_tx;
1218
1219	return 0;
1220
1221error:
1222	netdev_queue_update_kobjects(net, txq, 0);
1223	net_rx_queue_update_kobjects(net, rxq, 0);
1224	return error;
1225}
1226
1227static void remove_queue_kobjects(struct net_device *net)
1228{
1229	int real_rx = 0, real_tx = 0;
1230
1231#ifdef CONFIG_SYSFS
1232	real_rx = net->real_num_rx_queues;
1233#endif
1234	real_tx = net->real_num_tx_queues;
1235
1236	net_rx_queue_update_kobjects(net, real_rx, 0);
1237	netdev_queue_update_kobjects(net, real_tx, 0);
1238#ifdef CONFIG_SYSFS
1239	kset_unregister(net->queues_kset);
1240#endif
1241}
1242
1243static bool net_current_may_mount(void)
1244{
1245	struct net *net = current->nsproxy->net_ns;
1246
1247	return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1248}
1249
1250static void *net_grab_current_ns(void)
1251{
1252	struct net *ns = current->nsproxy->net_ns;
1253#ifdef CONFIG_NET_NS
1254	if (ns)
1255		atomic_inc(&ns->passive);
1256#endif
1257	return ns;
1258}
1259
1260static const void *net_initial_ns(void)
1261{
1262	return &init_net;
1263}
1264
1265static const void *net_netlink_ns(struct sock *sk)
1266{
1267	return sock_net(sk);
1268}
1269
1270struct kobj_ns_type_operations net_ns_type_operations = {
1271	.type = KOBJ_NS_TYPE_NET,
1272	.current_may_mount = net_current_may_mount,
1273	.grab_current_ns = net_grab_current_ns,
1274	.netlink_ns = net_netlink_ns,
1275	.initial_ns = net_initial_ns,
1276	.drop_ns = net_drop_ns,
1277};
1278EXPORT_SYMBOL_GPL(net_ns_type_operations);
1279
1280static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1281{
1282	struct net_device *dev = to_net_dev(d);
1283	int retval;
1284
1285	/* pass interface to uevent. */
1286	retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1287	if (retval)
1288		goto exit;
1289
1290	/* pass ifindex to uevent.
1291	 * ifindex is useful as it won't change (interface name may change)
1292	 * and is what RtNetlink uses natively. */
 
1293	retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1294
1295exit:
1296	return retval;
1297}
1298
1299/*
1300 *	netdev_release -- destroy and free a dead device.
1301 *	Called when last reference to device kobject is gone.
1302 */
1303static void netdev_release(struct device *d)
1304{
1305	struct net_device *dev = to_net_dev(d);
1306
1307	BUG_ON(dev->reg_state != NETREG_RELEASED);
1308
1309	kfree(dev->ifalias);
 
 
 
1310	netdev_freemem(dev);
1311}
1312
1313static const void *net_namespace(struct device *d)
1314{
1315	struct net_device *dev;
1316	dev = container_of(d, struct net_device, dev);
1317	return dev_net(dev);
1318}
1319
1320static struct class net_class = {
1321	.name = "net",
1322	.dev_release = netdev_release,
1323	.dev_groups = net_class_groups,
1324	.dev_uevent = netdev_uevent,
1325	.ns_type = &net_ns_type_operations,
1326	.namespace = net_namespace,
1327};
1328
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1329/* Delete sysfs entries but hold kobject reference until after all
1330 * netdev references are gone.
1331 */
1332void netdev_unregister_kobject(struct net_device * net)
1333{
1334	struct device *dev = &(net->dev);
 
 
 
1335
1336	kobject_get(&dev->kobj);
1337
1338	remove_queue_kobjects(net);
1339
1340	pm_runtime_set_memalloc_noio(dev, false);
1341
1342	device_del(dev);
1343}
1344
1345/* Create sysfs entries for network device. */
1346int netdev_register_kobject(struct net_device *net)
1347{
1348	struct device *dev = &(net->dev);
1349	const struct attribute_group **groups = net->sysfs_groups;
1350	int error = 0;
1351
1352	device_initialize(dev);
1353	dev->class = &net_class;
1354	dev->platform_data = net;
1355	dev->groups = groups;
1356
1357	dev_set_name(dev, "%s", net->name);
1358
1359#ifdef CONFIG_SYSFS
1360	/* Allow for a device specific group */
1361	if (*groups)
1362		groups++;
1363
1364	*groups++ = &netstat_group;
1365
1366#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1367	if (net->ieee80211_ptr)
1368		*groups++ = &wireless_group;
1369#if IS_ENABLED(CONFIG_WIRELESS_EXT)
1370	else if (net->wireless_handlers)
1371		*groups++ = &wireless_group;
1372#endif
1373#endif
1374#endif /* CONFIG_SYSFS */
1375
1376	error = device_add(dev);
1377	if (error)
1378		return error;
1379
1380	error = register_queue_kobjects(net);
1381	if (error) {
1382		device_del(dev);
1383		return error;
1384	}
1385
1386	pm_runtime_set_memalloc_noio(dev, true);
1387
1388	return error;
1389}
1390
1391int netdev_class_create_file_ns(struct class_attribute *class_attr,
1392				const void *ns)
1393{
1394	return class_create_file_ns(&net_class, class_attr, ns);
1395}
1396EXPORT_SYMBOL(netdev_class_create_file_ns);
1397
1398void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1399				 const void *ns)
1400{
1401	class_remove_file_ns(&net_class, class_attr, ns);
1402}
1403EXPORT_SYMBOL(netdev_class_remove_file_ns);
1404
1405int __init netdev_kobject_init(void)
1406{
1407	kobj_ns_type_register(&net_ns_type_operations);
1408	return class_register(&net_class);
1409}
v4.17
   1/*
   2 * net-sysfs.c - network device class and attributes
   3 *
   4 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
   5 *
   6 *	This program is free software; you can redistribute it and/or
   7 *	modify it under the terms of the GNU General Public License
   8 *	as published by the Free Software Foundation; either version
   9 *	2 of the License, or (at your option) any later version.
  10 */
  11
  12#include <linux/capability.h>
  13#include <linux/kernel.h>
  14#include <linux/netdevice.h>
  15#include <net/switchdev.h>
  16#include <linux/if_arp.h>
  17#include <linux/slab.h>
  18#include <linux/sched/signal.h>
  19#include <linux/nsproxy.h>
  20#include <net/sock.h>
  21#include <net/net_namespace.h>
  22#include <linux/rtnetlink.h>
  23#include <linux/vmalloc.h>
  24#include <linux/export.h>
  25#include <linux/jiffies.h>
  26#include <linux/pm_runtime.h>
  27#include <linux/of.h>
  28#include <linux/of_net.h>
  29
  30#include "net-sysfs.h"
  31
  32#ifdef CONFIG_SYSFS
  33static const char fmt_hex[] = "%#x\n";
 
  34static const char fmt_dec[] = "%d\n";
 
  35static const char fmt_ulong[] = "%lu\n";
  36static const char fmt_u64[] = "%llu\n";
  37
  38static inline int dev_isalive(const struct net_device *dev)
  39{
  40	return dev->reg_state <= NETREG_REGISTERED;
  41}
  42
  43/* use same locking rules as GIF* ioctl's */
  44static ssize_t netdev_show(const struct device *dev,
  45			   struct device_attribute *attr, char *buf,
  46			   ssize_t (*format)(const struct net_device *, char *))
  47{
  48	struct net_device *ndev = to_net_dev(dev);
  49	ssize_t ret = -EINVAL;
  50
  51	read_lock(&dev_base_lock);
  52	if (dev_isalive(ndev))
  53		ret = (*format)(ndev, buf);
  54	read_unlock(&dev_base_lock);
  55
  56	return ret;
  57}
  58
  59/* generate a show function for simple field */
  60#define NETDEVICE_SHOW(field, format_string)				\
  61static ssize_t format_##field(const struct net_device *dev, char *buf)	\
  62{									\
  63	return sprintf(buf, format_string, dev->field);			\
  64}									\
  65static ssize_t field##_show(struct device *dev,				\
  66			    struct device_attribute *attr, char *buf)	\
  67{									\
  68	return netdev_show(dev, attr, buf, format_##field);		\
  69}									\
  70
  71#define NETDEVICE_SHOW_RO(field, format_string)				\
  72NETDEVICE_SHOW(field, format_string);					\
  73static DEVICE_ATTR_RO(field)
  74
  75#define NETDEVICE_SHOW_RW(field, format_string)				\
  76NETDEVICE_SHOW(field, format_string);					\
  77static DEVICE_ATTR_RW(field)
  78
  79/* use same locking and permission rules as SIF* ioctl's */
  80static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  81			    const char *buf, size_t len,
  82			    int (*set)(struct net_device *, unsigned long))
  83{
  84	struct net_device *netdev = to_net_dev(dev);
  85	struct net *net = dev_net(netdev);
  86	unsigned long new;
  87	int ret = -EINVAL;
  88
  89	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  90		return -EPERM;
  91
  92	ret = kstrtoul(buf, 0, &new);
  93	if (ret)
  94		goto err;
  95
  96	if (!rtnl_trylock())
  97		return restart_syscall();
  98
  99	if (dev_isalive(netdev)) {
 100		ret = (*set)(netdev, new);
 101		if (ret == 0)
 102			ret = len;
 103	}
 104	rtnl_unlock();
 105 err:
 106	return ret;
 107}
 108
 109NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 110NETDEVICE_SHOW_RO(dev_port, fmt_dec);
 111NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 112NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 
 113NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 114NETDEVICE_SHOW_RO(type, fmt_dec);
 115NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 116
 117static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
 118			   char *buf)
 119{
 120	struct net_device *ndev = to_net_dev(dev);
 121
 122	return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
 123}
 124static DEVICE_ATTR_RO(iflink);
 125
 126static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
 127{
 128	return sprintf(buf, fmt_dec, dev->name_assign_type);
 129}
 130
 131static ssize_t name_assign_type_show(struct device *dev,
 132				     struct device_attribute *attr,
 133				     char *buf)
 134{
 135	struct net_device *ndev = to_net_dev(dev);
 136	ssize_t ret = -EINVAL;
 137
 138	if (ndev->name_assign_type != NET_NAME_UNKNOWN)
 139		ret = netdev_show(dev, attr, buf, format_name_assign_type);
 140
 141	return ret;
 142}
 143static DEVICE_ATTR_RO(name_assign_type);
 144
 145/* use same locking rules as GIFHWADDR ioctl's */
 146static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 147			    char *buf)
 148{
 149	struct net_device *ndev = to_net_dev(dev);
 150	ssize_t ret = -EINVAL;
 151
 152	read_lock(&dev_base_lock);
 153	if (dev_isalive(ndev))
 154		ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
 155	read_unlock(&dev_base_lock);
 156	return ret;
 157}
 158static DEVICE_ATTR_RO(address);
 159
 160static ssize_t broadcast_show(struct device *dev,
 161			      struct device_attribute *attr, char *buf)
 162{
 163	struct net_device *ndev = to_net_dev(dev);
 164
 165	if (dev_isalive(ndev))
 166		return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
 167	return -EINVAL;
 168}
 169static DEVICE_ATTR_RO(broadcast);
 170
 171static int change_carrier(struct net_device *dev, unsigned long new_carrier)
 172{
 173	if (!netif_running(dev))
 174		return -EINVAL;
 175	return dev_change_carrier(dev, (bool)new_carrier);
 176}
 177
 178static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 179			     const char *buf, size_t len)
 180{
 181	return netdev_store(dev, attr, buf, len, change_carrier);
 182}
 183
 184static ssize_t carrier_show(struct device *dev,
 185			    struct device_attribute *attr, char *buf)
 186{
 187	struct net_device *netdev = to_net_dev(dev);
 188
 189	if (netif_running(netdev))
 190		return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 191
 192	return -EINVAL;
 193}
 194static DEVICE_ATTR_RW(carrier);
 195
 196static ssize_t speed_show(struct device *dev,
 197			  struct device_attribute *attr, char *buf)
 198{
 199	struct net_device *netdev = to_net_dev(dev);
 200	int ret = -EINVAL;
 201
 202	if (!rtnl_trylock())
 203		return restart_syscall();
 204
 205	if (netif_running(netdev)) {
 206		struct ethtool_link_ksettings cmd;
 207
 208		if (!__ethtool_get_link_ksettings(netdev, &cmd))
 209			ret = sprintf(buf, fmt_dec, cmd.base.speed);
 210	}
 211	rtnl_unlock();
 212	return ret;
 213}
 214static DEVICE_ATTR_RO(speed);
 215
 216static ssize_t duplex_show(struct device *dev,
 217			   struct device_attribute *attr, char *buf)
 218{
 219	struct net_device *netdev = to_net_dev(dev);
 220	int ret = -EINVAL;
 221
 222	if (!rtnl_trylock())
 223		return restart_syscall();
 224
 225	if (netif_running(netdev)) {
 226		struct ethtool_link_ksettings cmd;
 227
 228		if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
 229			const char *duplex;
 230
 231			switch (cmd.base.duplex) {
 232			case DUPLEX_HALF:
 233				duplex = "half";
 234				break;
 235			case DUPLEX_FULL:
 236				duplex = "full";
 237				break;
 238			default:
 239				duplex = "unknown";
 240				break;
 241			}
 242			ret = sprintf(buf, "%s\n", duplex);
 243		}
 244	}
 245	rtnl_unlock();
 246	return ret;
 247}
 248static DEVICE_ATTR_RO(duplex);
 249
 250static ssize_t dormant_show(struct device *dev,
 251			    struct device_attribute *attr, char *buf)
 252{
 253	struct net_device *netdev = to_net_dev(dev);
 254
 255	if (netif_running(netdev))
 256		return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 257
 258	return -EINVAL;
 259}
 260static DEVICE_ATTR_RO(dormant);
 261
 262static const char *const operstates[] = {
 263	"unknown",
 264	"notpresent", /* currently unused */
 265	"down",
 266	"lowerlayerdown",
 267	"testing", /* currently unused */
 268	"dormant",
 269	"up"
 270};
 271
 272static ssize_t operstate_show(struct device *dev,
 273			      struct device_attribute *attr, char *buf)
 274{
 275	const struct net_device *netdev = to_net_dev(dev);
 276	unsigned char operstate;
 277
 278	read_lock(&dev_base_lock);
 279	operstate = netdev->operstate;
 280	if (!netif_running(netdev))
 281		operstate = IF_OPER_DOWN;
 282	read_unlock(&dev_base_lock);
 283
 284	if (operstate >= ARRAY_SIZE(operstates))
 285		return -EINVAL; /* should not happen */
 286
 287	return sprintf(buf, "%s\n", operstates[operstate]);
 288}
 289static DEVICE_ATTR_RO(operstate);
 290
 291static ssize_t carrier_changes_show(struct device *dev,
 292				    struct device_attribute *attr,
 293				    char *buf)
 294{
 295	struct net_device *netdev = to_net_dev(dev);
 296
 297	return sprintf(buf, fmt_dec,
 298		       atomic_read(&netdev->carrier_up_count) +
 299		       atomic_read(&netdev->carrier_down_count));
 300}
 301static DEVICE_ATTR_RO(carrier_changes);
 302
 303static ssize_t carrier_up_count_show(struct device *dev,
 304				     struct device_attribute *attr,
 305				     char *buf)
 306{
 307	struct net_device *netdev = to_net_dev(dev);
 308
 309	return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
 310}
 311static DEVICE_ATTR_RO(carrier_up_count);
 312
 313static ssize_t carrier_down_count_show(struct device *dev,
 314				       struct device_attribute *attr,
 315				       char *buf)
 316{
 317	struct net_device *netdev = to_net_dev(dev);
 318
 319	return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
 320}
 321static DEVICE_ATTR_RO(carrier_down_count);
 322
 323/* read-write attributes */
 324
 325static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 326{
 327	return dev_set_mtu(dev, (int)new_mtu);
 328}
 329
 330static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 331			 const char *buf, size_t len)
 332{
 333	return netdev_store(dev, attr, buf, len, change_mtu);
 334}
 335NETDEVICE_SHOW_RW(mtu, fmt_dec);
 336
 337static int change_flags(struct net_device *dev, unsigned long new_flags)
 338{
 339	return dev_change_flags(dev, (unsigned int)new_flags);
 340}
 341
 342static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 343			   const char *buf, size_t len)
 344{
 345	return netdev_store(dev, attr, buf, len, change_flags);
 346}
 347NETDEVICE_SHOW_RW(flags, fmt_hex);
 348
 349static ssize_t tx_queue_len_store(struct device *dev,
 350				  struct device_attribute *attr,
 351				  const char *buf, size_t len)
 352{
 353	if (!capable(CAP_NET_ADMIN))
 354		return -EPERM;
 355
 356	return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
 357}
 358NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
 359
 360static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 361{
 362	dev->gro_flush_timeout = val;
 363	return 0;
 364}
 365
 366static ssize_t gro_flush_timeout_store(struct device *dev,
 367				       struct device_attribute *attr,
 368				       const char *buf, size_t len)
 369{
 370	if (!capable(CAP_NET_ADMIN))
 371		return -EPERM;
 372
 373	return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 374}
 375NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 376
 377static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 378			     const char *buf, size_t len)
 379{
 380	struct net_device *netdev = to_net_dev(dev);
 381	struct net *net = dev_net(netdev);
 382	size_t count = len;
 383	ssize_t ret = 0;
 384
 385	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 386		return -EPERM;
 387
 388	/* ignore trailing newline */
 389	if (len >  0 && buf[len - 1] == '\n')
 390		--count;
 391
 392	if (!rtnl_trylock())
 393		return restart_syscall();
 394
 395	if (dev_isalive(netdev)) {
 396		ret = dev_set_alias(netdev, buf, count);
 397		if (ret < 0)
 398			goto err;
 399		ret = len;
 400		netdev_state_change(netdev);
 401	}
 402err:
 403	rtnl_unlock();
 404
 405	return ret;
 406}
 407
 408static ssize_t ifalias_show(struct device *dev,
 409			    struct device_attribute *attr, char *buf)
 410{
 411	const struct net_device *netdev = to_net_dev(dev);
 412	char tmp[IFALIASZ];
 413	ssize_t ret = 0;
 414
 415	ret = dev_get_alias(netdev, tmp, sizeof(tmp));
 416	if (ret > 0)
 417		ret = sprintf(buf, "%s\n", tmp);
 
 
 418	return ret;
 419}
 420static DEVICE_ATTR_RW(ifalias);
 421
 422static int change_group(struct net_device *dev, unsigned long new_group)
 423{
 424	dev_set_group(dev, (int)new_group);
 425	return 0;
 426}
 427
 428static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 429			   const char *buf, size_t len)
 430{
 431	return netdev_store(dev, attr, buf, len, change_group);
 432}
 433NETDEVICE_SHOW(group, fmt_dec);
 434static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
 435
 436static int change_proto_down(struct net_device *dev, unsigned long proto_down)
 437{
 438	return dev_change_proto_down(dev, (bool)proto_down);
 439}
 440
 441static ssize_t proto_down_store(struct device *dev,
 442				struct device_attribute *attr,
 443				const char *buf, size_t len)
 444{
 445	return netdev_store(dev, attr, buf, len, change_proto_down);
 446}
 447NETDEVICE_SHOW_RW(proto_down, fmt_dec);
 448
 449static ssize_t phys_port_id_show(struct device *dev,
 450				 struct device_attribute *attr, char *buf)
 451{
 452	struct net_device *netdev = to_net_dev(dev);
 453	ssize_t ret = -EINVAL;
 454
 455	if (!rtnl_trylock())
 456		return restart_syscall();
 457
 458	if (dev_isalive(netdev)) {
 459		struct netdev_phys_item_id ppid;
 460
 461		ret = dev_get_phys_port_id(netdev, &ppid);
 462		if (!ret)
 463			ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 464	}
 465	rtnl_unlock();
 466
 467	return ret;
 468}
 469static DEVICE_ATTR_RO(phys_port_id);
 470
 471static ssize_t phys_port_name_show(struct device *dev,
 472				   struct device_attribute *attr, char *buf)
 473{
 474	struct net_device *netdev = to_net_dev(dev);
 475	ssize_t ret = -EINVAL;
 476
 477	if (!rtnl_trylock())
 478		return restart_syscall();
 479
 480	if (dev_isalive(netdev)) {
 481		char name[IFNAMSIZ];
 482
 483		ret = dev_get_phys_port_name(netdev, name, sizeof(name));
 484		if (!ret)
 485			ret = sprintf(buf, "%s\n", name);
 486	}
 487	rtnl_unlock();
 488
 489	return ret;
 490}
 491static DEVICE_ATTR_RO(phys_port_name);
 492
 493static ssize_t phys_switch_id_show(struct device *dev,
 494				   struct device_attribute *attr, char *buf)
 495{
 496	struct net_device *netdev = to_net_dev(dev);
 497	ssize_t ret = -EINVAL;
 498
 499	if (!rtnl_trylock())
 500		return restart_syscall();
 501
 502	if (dev_isalive(netdev)) {
 503		struct switchdev_attr attr = {
 504			.orig_dev = netdev,
 505			.id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
 506			.flags = SWITCHDEV_F_NO_RECURSE,
 507		};
 508
 509		ret = switchdev_port_attr_get(netdev, &attr);
 510		if (!ret)
 511			ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
 512				      attr.u.ppid.id);
 513	}
 514	rtnl_unlock();
 515
 516	return ret;
 517}
 518static DEVICE_ATTR_RO(phys_switch_id);
 519
 520static struct attribute *net_class_attrs[] __ro_after_init = {
 521	&dev_attr_netdev_group.attr,
 522	&dev_attr_type.attr,
 523	&dev_attr_dev_id.attr,
 524	&dev_attr_dev_port.attr,
 525	&dev_attr_iflink.attr,
 526	&dev_attr_ifindex.attr,
 527	&dev_attr_name_assign_type.attr,
 528	&dev_attr_addr_assign_type.attr,
 529	&dev_attr_addr_len.attr,
 530	&dev_attr_link_mode.attr,
 531	&dev_attr_address.attr,
 532	&dev_attr_broadcast.attr,
 533	&dev_attr_speed.attr,
 534	&dev_attr_duplex.attr,
 535	&dev_attr_dormant.attr,
 536	&dev_attr_operstate.attr,
 537	&dev_attr_carrier_changes.attr,
 538	&dev_attr_ifalias.attr,
 539	&dev_attr_carrier.attr,
 540	&dev_attr_mtu.attr,
 541	&dev_attr_flags.attr,
 542	&dev_attr_tx_queue_len.attr,
 543	&dev_attr_gro_flush_timeout.attr,
 544	&dev_attr_phys_port_id.attr,
 545	&dev_attr_phys_port_name.attr,
 546	&dev_attr_phys_switch_id.attr,
 547	&dev_attr_proto_down.attr,
 548	&dev_attr_carrier_up_count.attr,
 549	&dev_attr_carrier_down_count.attr,
 550	NULL,
 551};
 552ATTRIBUTE_GROUPS(net_class);
 553
 554/* Show a given an attribute in the statistics group */
 555static ssize_t netstat_show(const struct device *d,
 556			    struct device_attribute *attr, char *buf,
 557			    unsigned long offset)
 558{
 559	struct net_device *dev = to_net_dev(d);
 560	ssize_t ret = -EINVAL;
 561
 562	WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 563		offset % sizeof(u64) != 0);
 564
 565	read_lock(&dev_base_lock);
 566	if (dev_isalive(dev)) {
 567		struct rtnl_link_stats64 temp;
 568		const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 569
 570		ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
 571	}
 572	read_unlock(&dev_base_lock);
 573	return ret;
 574}
 575
 576/* generate a read-only statistics attribute */
 577#define NETSTAT_ENTRY(name)						\
 578static ssize_t name##_show(struct device *d,				\
 579			   struct device_attribute *attr, char *buf)	\
 580{									\
 581	return netstat_show(d, attr, buf,				\
 582			    offsetof(struct rtnl_link_stats64, name));	\
 583}									\
 584static DEVICE_ATTR_RO(name)
 585
 586NETSTAT_ENTRY(rx_packets);
 587NETSTAT_ENTRY(tx_packets);
 588NETSTAT_ENTRY(rx_bytes);
 589NETSTAT_ENTRY(tx_bytes);
 590NETSTAT_ENTRY(rx_errors);
 591NETSTAT_ENTRY(tx_errors);
 592NETSTAT_ENTRY(rx_dropped);
 593NETSTAT_ENTRY(tx_dropped);
 594NETSTAT_ENTRY(multicast);
 595NETSTAT_ENTRY(collisions);
 596NETSTAT_ENTRY(rx_length_errors);
 597NETSTAT_ENTRY(rx_over_errors);
 598NETSTAT_ENTRY(rx_crc_errors);
 599NETSTAT_ENTRY(rx_frame_errors);
 600NETSTAT_ENTRY(rx_fifo_errors);
 601NETSTAT_ENTRY(rx_missed_errors);
 602NETSTAT_ENTRY(tx_aborted_errors);
 603NETSTAT_ENTRY(tx_carrier_errors);
 604NETSTAT_ENTRY(tx_fifo_errors);
 605NETSTAT_ENTRY(tx_heartbeat_errors);
 606NETSTAT_ENTRY(tx_window_errors);
 607NETSTAT_ENTRY(rx_compressed);
 608NETSTAT_ENTRY(tx_compressed);
 609NETSTAT_ENTRY(rx_nohandler);
 610
 611static struct attribute *netstat_attrs[] __ro_after_init = {
 612	&dev_attr_rx_packets.attr,
 613	&dev_attr_tx_packets.attr,
 614	&dev_attr_rx_bytes.attr,
 615	&dev_attr_tx_bytes.attr,
 616	&dev_attr_rx_errors.attr,
 617	&dev_attr_tx_errors.attr,
 618	&dev_attr_rx_dropped.attr,
 619	&dev_attr_tx_dropped.attr,
 620	&dev_attr_multicast.attr,
 621	&dev_attr_collisions.attr,
 622	&dev_attr_rx_length_errors.attr,
 623	&dev_attr_rx_over_errors.attr,
 624	&dev_attr_rx_crc_errors.attr,
 625	&dev_attr_rx_frame_errors.attr,
 626	&dev_attr_rx_fifo_errors.attr,
 627	&dev_attr_rx_missed_errors.attr,
 628	&dev_attr_tx_aborted_errors.attr,
 629	&dev_attr_tx_carrier_errors.attr,
 630	&dev_attr_tx_fifo_errors.attr,
 631	&dev_attr_tx_heartbeat_errors.attr,
 632	&dev_attr_tx_window_errors.attr,
 633	&dev_attr_rx_compressed.attr,
 634	&dev_attr_tx_compressed.attr,
 635	&dev_attr_rx_nohandler.attr,
 636	NULL
 637};
 638
 639static const struct attribute_group netstat_group = {
 
 640	.name  = "statistics",
 641	.attrs  = netstat_attrs,
 642};
 643
 644#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 645static struct attribute *wireless_attrs[] = {
 646	NULL
 647};
 648
 649static const struct attribute_group wireless_group = {
 650	.name = "wireless",
 651	.attrs = wireless_attrs,
 652};
 653#endif
 654
 655#else /* CONFIG_SYSFS */
 656#define net_class_groups	NULL
 657#endif /* CONFIG_SYSFS */
 658
 659#ifdef CONFIG_SYSFS
 660#define to_rx_queue_attr(_attr) \
 661	container_of(_attr, struct rx_queue_attribute, attr)
 662
 663#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 664
 665static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 666				  char *buf)
 667{
 668	const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 669	struct netdev_rx_queue *queue = to_rx_queue(kobj);
 670
 671	if (!attribute->show)
 672		return -EIO;
 673
 674	return attribute->show(queue, buf);
 675}
 676
 677static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 678				   const char *buf, size_t count)
 679{
 680	const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 681	struct netdev_rx_queue *queue = to_rx_queue(kobj);
 682
 683	if (!attribute->store)
 684		return -EIO;
 685
 686	return attribute->store(queue, buf, count);
 687}
 688
 689static const struct sysfs_ops rx_queue_sysfs_ops = {
 690	.show = rx_queue_attr_show,
 691	.store = rx_queue_attr_store,
 692};
 693
 694#ifdef CONFIG_RPS
 695static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
 
 696{
 697	struct rps_map *map;
 698	cpumask_var_t mask;
 699	int i, len;
 
 700
 701	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 702		return -ENOMEM;
 703
 704	rcu_read_lock();
 705	map = rcu_dereference(queue->rps_map);
 706	if (map)
 707		for (i = 0; i < map->len; i++)
 708			cpumask_set_cpu(map->cpus[i], mask);
 709
 710	len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 
 
 
 
 
 711	rcu_read_unlock();
 
 712	free_cpumask_var(mask);
 713
 714	return len < PAGE_SIZE ? len : -EINVAL;
 715}
 716
 717static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 718			     const char *buf, size_t len)
 
 719{
 720	struct rps_map *old_map, *map;
 721	cpumask_var_t mask;
 722	int err, cpu, i;
 723	static DEFINE_MUTEX(rps_map_mutex);
 724
 725	if (!capable(CAP_NET_ADMIN))
 726		return -EPERM;
 727
 728	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 729		return -ENOMEM;
 730
 731	err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 732	if (err) {
 733		free_cpumask_var(mask);
 734		return err;
 735	}
 736
 737	map = kzalloc(max_t(unsigned int,
 738			    RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 739		      GFP_KERNEL);
 740	if (!map) {
 741		free_cpumask_var(mask);
 742		return -ENOMEM;
 743	}
 744
 745	i = 0;
 746	for_each_cpu_and(cpu, mask, cpu_online_mask)
 747		map->cpus[i++] = cpu;
 748
 749	if (i) {
 750		map->len = i;
 751	} else {
 752		kfree(map);
 753		map = NULL;
 754	}
 755
 756	mutex_lock(&rps_map_mutex);
 757	old_map = rcu_dereference_protected(queue->rps_map,
 758					    mutex_is_locked(&rps_map_mutex));
 759	rcu_assign_pointer(queue->rps_map, map);
 
 760
 761	if (map)
 762		static_key_slow_inc(&rps_needed);
 763	if (old_map)
 
 764		static_key_slow_dec(&rps_needed);
 765
 766	mutex_unlock(&rps_map_mutex);
 767
 768	if (old_map)
 769		kfree_rcu(old_map, rcu);
 770
 771	free_cpumask_var(mask);
 772	return len;
 773}
 774
 775static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 
 776					   char *buf)
 777{
 778	struct rps_dev_flow_table *flow_table;
 779	unsigned long val = 0;
 780
 781	rcu_read_lock();
 782	flow_table = rcu_dereference(queue->rps_flow_table);
 783	if (flow_table)
 784		val = (unsigned long)flow_table->mask + 1;
 785	rcu_read_unlock();
 786
 787	return sprintf(buf, "%lu\n", val);
 788}
 789
 790static void rps_dev_flow_table_release(struct rcu_head *rcu)
 791{
 792	struct rps_dev_flow_table *table = container_of(rcu,
 793	    struct rps_dev_flow_table, rcu);
 794	vfree(table);
 795}
 796
 797static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 798					    const char *buf, size_t len)
 
 799{
 800	unsigned long mask, count;
 801	struct rps_dev_flow_table *table, *old_table;
 802	static DEFINE_SPINLOCK(rps_dev_flow_lock);
 803	int rc;
 804
 805	if (!capable(CAP_NET_ADMIN))
 806		return -EPERM;
 807
 808	rc = kstrtoul(buf, 0, &count);
 809	if (rc < 0)
 810		return rc;
 811
 812	if (count) {
 813		mask = count - 1;
 814		/* mask = roundup_pow_of_two(count) - 1;
 815		 * without overflows...
 816		 */
 817		while ((mask | (mask >> 1)) != mask)
 818			mask |= (mask >> 1);
 819		/* On 64 bit arches, must check mask fits in table->mask (u32),
 820		 * and on 32bit arches, must check
 821		 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 822		 */
 823#if BITS_PER_LONG > 32
 824		if (mask > (unsigned long)(u32)mask)
 825			return -EINVAL;
 826#else
 827		if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 828				/ sizeof(struct rps_dev_flow)) {
 829			/* Enforce a limit to prevent overflow */
 830			return -EINVAL;
 831		}
 832#endif
 833		table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 834		if (!table)
 835			return -ENOMEM;
 836
 837		table->mask = mask;
 838		for (count = 0; count <= mask; count++)
 839			table->flows[count].cpu = RPS_NO_CPU;
 840	} else {
 841		table = NULL;
 842	}
 843
 844	spin_lock(&rps_dev_flow_lock);
 845	old_table = rcu_dereference_protected(queue->rps_flow_table,
 846					      lockdep_is_held(&rps_dev_flow_lock));
 847	rcu_assign_pointer(queue->rps_flow_table, table);
 848	spin_unlock(&rps_dev_flow_lock);
 849
 850	if (old_table)
 851		call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 852
 853	return len;
 854}
 855
 856static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
 857	= __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
 858
 859static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
 860	= __ATTR(rps_flow_cnt, 0644,
 861		 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 
 862#endif /* CONFIG_RPS */
 863
 864static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
 865#ifdef CONFIG_RPS
 866	&rps_cpus_attribute.attr,
 867	&rps_dev_flow_table_cnt_attribute.attr,
 868#endif
 869	NULL
 870};
 871
 872static void rx_queue_release(struct kobject *kobj)
 873{
 874	struct netdev_rx_queue *queue = to_rx_queue(kobj);
 875#ifdef CONFIG_RPS
 876	struct rps_map *map;
 877	struct rps_dev_flow_table *flow_table;
 878
 
 879	map = rcu_dereference_protected(queue->rps_map, 1);
 880	if (map) {
 881		RCU_INIT_POINTER(queue->rps_map, NULL);
 882		kfree_rcu(map, rcu);
 883	}
 884
 885	flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 886	if (flow_table) {
 887		RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 888		call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 889	}
 890#endif
 891
 892	memset(kobj, 0, sizeof(*kobj));
 893	dev_put(queue->dev);
 894}
 895
 896static const void *rx_queue_namespace(struct kobject *kobj)
 897{
 898	struct netdev_rx_queue *queue = to_rx_queue(kobj);
 899	struct device *dev = &queue->dev->dev;
 900	const void *ns = NULL;
 901
 902	if (dev->class && dev->class->ns_type)
 903		ns = dev->class->namespace(dev);
 904
 905	return ns;
 906}
 907
 908static struct kobj_type rx_queue_ktype __ro_after_init = {
 909	.sysfs_ops = &rx_queue_sysfs_ops,
 910	.release = rx_queue_release,
 911	.default_attrs = rx_queue_default_attrs,
 912	.namespace = rx_queue_namespace
 913};
 914
 915static int rx_queue_add_kobject(struct net_device *dev, int index)
 916{
 917	struct netdev_rx_queue *queue = dev->_rx + index;
 918	struct kobject *kobj = &queue->kobj;
 919	int error = 0;
 920
 921	kobj->kset = dev->queues_kset;
 922	error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 923				     "rx-%u", index);
 924	if (error)
 925		return error;
 926
 927	if (dev->sysfs_rx_queue_group) {
 928		error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
 929		if (error) {
 930			kobject_put(kobj);
 931			return error;
 932		}
 933	}
 934
 935	kobject_uevent(kobj, KOBJ_ADD);
 936	dev_hold(queue->dev);
 937
 938	return error;
 
 
 
 939}
 940#endif /* CONFIG_SYSFS */
 941
 942int
 943net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
 944{
 945#ifdef CONFIG_SYSFS
 946	int i;
 947	int error = 0;
 948
 949#ifndef CONFIG_RPS
 950	if (!dev->sysfs_rx_queue_group)
 951		return 0;
 952#endif
 953	for (i = old_num; i < new_num; i++) {
 954		error = rx_queue_add_kobject(dev, i);
 955		if (error) {
 956			new_num = old_num;
 957			break;
 958		}
 959	}
 960
 961	while (--i >= new_num) {
 962		struct kobject *kobj = &dev->_rx[i].kobj;
 963
 964		if (!refcount_read(&dev_net(dev)->count))
 965			kobj->uevent_suppress = 1;
 966		if (dev->sysfs_rx_queue_group)
 967			sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
 968		kobject_put(kobj);
 969	}
 970
 971	return error;
 972#else
 973	return 0;
 974#endif
 975}
 976
 977#ifdef CONFIG_SYSFS
 978/*
 979 * netdev_queue sysfs structures and functions.
 980 */
 981struct netdev_queue_attribute {
 982	struct attribute attr;
 983	ssize_t (*show)(struct netdev_queue *queue, char *buf);
 
 984	ssize_t (*store)(struct netdev_queue *queue,
 985			 const char *buf, size_t len);
 986};
 987#define to_netdev_queue_attr(_attr) \
 988	container_of(_attr, struct netdev_queue_attribute, attr)
 989
 990#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 991
 992static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 993				      struct attribute *attr, char *buf)
 994{
 995	const struct netdev_queue_attribute *attribute
 996		= to_netdev_queue_attr(attr);
 997	struct netdev_queue *queue = to_netdev_queue(kobj);
 998
 999	if (!attribute->show)
1000		return -EIO;
1001
1002	return attribute->show(queue, buf);
1003}
1004
1005static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1006				       struct attribute *attr,
1007				       const char *buf, size_t count)
1008{
1009	const struct netdev_queue_attribute *attribute
1010		= to_netdev_queue_attr(attr);
1011	struct netdev_queue *queue = to_netdev_queue(kobj);
1012
1013	if (!attribute->store)
1014		return -EIO;
1015
1016	return attribute->store(queue, buf, count);
1017}
1018
1019static const struct sysfs_ops netdev_queue_sysfs_ops = {
1020	.show = netdev_queue_attr_show,
1021	.store = netdev_queue_attr_store,
1022};
1023
1024static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
 
 
1025{
1026	unsigned long trans_timeout;
1027
1028	spin_lock_irq(&queue->_xmit_lock);
1029	trans_timeout = queue->trans_timeout;
1030	spin_unlock_irq(&queue->_xmit_lock);
1031
1032	return sprintf(buf, "%lu", trans_timeout);
1033}
1034
1035static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1036{
1037	struct net_device *dev = queue->dev;
1038	unsigned int i;
1039
1040	i = queue - dev->_tx;
1041	BUG_ON(i >= dev->num_tx_queues);
1042
1043	return i;
1044}
1045
1046static ssize_t traffic_class_show(struct netdev_queue *queue,
1047				  char *buf)
1048{
1049	struct net_device *dev = queue->dev;
1050	int index = get_netdev_queue_index(queue);
1051	int tc = netdev_txq_to_tc(dev, index);
1052
1053	if (tc < 0)
1054		return -EINVAL;
1055
1056	return sprintf(buf, "%u\n", tc);
1057}
1058
1059#ifdef CONFIG_XPS
1060static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1061			       char *buf)
1062{
1063	return sprintf(buf, "%lu\n", queue->tx_maxrate);
1064}
1065
1066static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1067				const char *buf, size_t len)
1068{
1069	struct net_device *dev = queue->dev;
1070	int err, index = get_netdev_queue_index(queue);
1071	u32 rate = 0;
1072
1073	err = kstrtou32(buf, 10, &rate);
1074	if (err < 0)
1075		return err;
1076
1077	if (!rtnl_trylock())
1078		return restart_syscall();
1079
1080	err = -EOPNOTSUPP;
1081	if (dev->netdev_ops->ndo_set_tx_maxrate)
1082		err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1083
1084	rtnl_unlock();
1085	if (!err) {
1086		queue->tx_maxrate = rate;
1087		return len;
1088	}
1089	return err;
1090}
1091
1092static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1093	= __ATTR_RW(tx_maxrate);
1094#endif
1095
1096static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1097	= __ATTR_RO(tx_timeout);
1098
1099static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1100	= __ATTR_RO(traffic_class);
1101
1102#ifdef CONFIG_BQL
1103/*
1104 * Byte queue limits sysfs structures and functions.
1105 */
1106static ssize_t bql_show(char *buf, unsigned int value)
1107{
1108	return sprintf(buf, "%u\n", value);
1109}
1110
1111static ssize_t bql_set(const char *buf, const size_t count,
1112		       unsigned int *pvalue)
1113{
1114	unsigned int value;
1115	int err;
1116
1117	if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1118		value = DQL_MAX_LIMIT;
1119	} else {
1120		err = kstrtouint(buf, 10, &value);
1121		if (err < 0)
1122			return err;
1123		if (value > DQL_MAX_LIMIT)
1124			return -EINVAL;
1125	}
1126
1127	*pvalue = value;
1128
1129	return count;
1130}
1131
1132static ssize_t bql_show_hold_time(struct netdev_queue *queue,
 
1133				  char *buf)
1134{
1135	struct dql *dql = &queue->dql;
1136
1137	return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1138}
1139
1140static ssize_t bql_set_hold_time(struct netdev_queue *queue,
 
1141				 const char *buf, size_t len)
1142{
1143	struct dql *dql = &queue->dql;
1144	unsigned int value;
1145	int err;
1146
1147	err = kstrtouint(buf, 10, &value);
1148	if (err < 0)
1149		return err;
1150
1151	dql->slack_hold_time = msecs_to_jiffies(value);
1152
1153	return len;
1154}
1155
1156static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1157	= __ATTR(hold_time, 0644,
1158		 bql_show_hold_time, bql_set_hold_time);
1159
1160static ssize_t bql_show_inflight(struct netdev_queue *queue,
 
1161				 char *buf)
1162{
1163	struct dql *dql = &queue->dql;
1164
1165	return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1166}
1167
1168static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1169	__ATTR(inflight, 0444, bql_show_inflight, NULL);
1170
1171#define BQL_ATTR(NAME, FIELD)						\
1172static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,		\
 
1173				 char *buf)				\
1174{									\
1175	return bql_show(buf, queue->dql.FIELD);				\
1176}									\
1177									\
1178static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,		\
 
1179				const char *buf, size_t len)		\
1180{									\
1181	return bql_set(buf, len, &queue->dql.FIELD);			\
1182}									\
1183									\
1184static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1185	= __ATTR(NAME, 0644,				\
1186		 bql_show_ ## NAME, bql_set_ ## NAME)
1187
1188BQL_ATTR(limit, limit);
1189BQL_ATTR(limit_max, max_limit);
1190BQL_ATTR(limit_min, min_limit);
1191
1192static struct attribute *dql_attrs[] __ro_after_init = {
1193	&bql_limit_attribute.attr,
1194	&bql_limit_max_attribute.attr,
1195	&bql_limit_min_attribute.attr,
1196	&bql_hold_time_attribute.attr,
1197	&bql_inflight_attribute.attr,
1198	NULL
1199};
1200
1201static const struct attribute_group dql_group = {
1202	.name  = "byte_queue_limits",
1203	.attrs  = dql_attrs,
1204};
1205#endif /* CONFIG_BQL */
1206
1207#ifdef CONFIG_XPS
1208static ssize_t xps_cpus_show(struct netdev_queue *queue,
1209			     char *buf)
 
 
 
 
 
 
 
 
 
 
 
 
1210{
1211	struct net_device *dev = queue->dev;
1212	int cpu, len, num_tc = 1, tc = 0;
1213	struct xps_dev_maps *dev_maps;
1214	cpumask_var_t mask;
1215	unsigned long index;
1216
1217	index = get_netdev_queue_index(queue);
1218
1219	if (dev->num_tc) {
1220		num_tc = dev->num_tc;
1221		tc = netdev_txq_to_tc(dev, index);
1222		if (tc < 0)
1223			return -EINVAL;
1224	}
1225
1226	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1227		return -ENOMEM;
1228
 
 
1229	rcu_read_lock();
1230	dev_maps = rcu_dereference(dev->xps_maps);
1231	if (dev_maps) {
1232		for_each_possible_cpu(cpu) {
1233			int i, tci = cpu * num_tc + tc;
1234			struct xps_map *map;
1235
1236			map = rcu_dereference(dev_maps->cpu_map[tci]);
1237			if (!map)
1238				continue;
1239
1240			for (i = map->len; i--;) {
1241				if (map->queues[i] == index) {
1242					cpumask_set_cpu(cpu, mask);
1243					break;
1244				}
1245			}
1246		}
1247	}
1248	rcu_read_unlock();
1249
1250	len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 
 
 
 
 
1251	free_cpumask_var(mask);
1252	return len < PAGE_SIZE ? len : -EINVAL;
 
1253}
1254
1255static ssize_t xps_cpus_store(struct netdev_queue *queue,
1256			      const char *buf, size_t len)
 
1257{
1258	struct net_device *dev = queue->dev;
1259	unsigned long index;
1260	cpumask_var_t mask;
1261	int err;
1262
1263	if (!capable(CAP_NET_ADMIN))
1264		return -EPERM;
1265
1266	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1267		return -ENOMEM;
1268
1269	index = get_netdev_queue_index(queue);
1270
1271	err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1272	if (err) {
1273		free_cpumask_var(mask);
1274		return err;
1275	}
1276
1277	err = netif_set_xps_queue(dev, mask, index);
1278
1279	free_cpumask_var(mask);
1280
1281	return err ? : len;
1282}
1283
1284static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1285	= __ATTR_RW(xps_cpus);
1286#endif /* CONFIG_XPS */
1287
1288static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1289	&queue_trans_timeout.attr,
1290	&queue_traffic_class.attr,
1291#ifdef CONFIG_XPS
1292	&xps_cpus_attribute.attr,
1293	&queue_tx_maxrate.attr,
1294#endif
1295	NULL
1296};
1297
1298static void netdev_queue_release(struct kobject *kobj)
1299{
1300	struct netdev_queue *queue = to_netdev_queue(kobj);
1301
1302	memset(kobj, 0, sizeof(*kobj));
1303	dev_put(queue->dev);
1304}
1305
1306static const void *netdev_queue_namespace(struct kobject *kobj)
1307{
1308	struct netdev_queue *queue = to_netdev_queue(kobj);
1309	struct device *dev = &queue->dev->dev;
1310	const void *ns = NULL;
1311
1312	if (dev->class && dev->class->ns_type)
1313		ns = dev->class->namespace(dev);
1314
1315	return ns;
1316}
1317
1318static struct kobj_type netdev_queue_ktype __ro_after_init = {
1319	.sysfs_ops = &netdev_queue_sysfs_ops,
1320	.release = netdev_queue_release,
1321	.default_attrs = netdev_queue_default_attrs,
1322	.namespace = netdev_queue_namespace,
1323};
1324
1325static int netdev_queue_add_kobject(struct net_device *dev, int index)
1326{
1327	struct netdev_queue *queue = dev->_tx + index;
1328	struct kobject *kobj = &queue->kobj;
1329	int error = 0;
1330
1331	kobj->kset = dev->queues_kset;
1332	error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1333				     "tx-%u", index);
1334	if (error)
1335		return error;
1336
1337#ifdef CONFIG_BQL
1338	error = sysfs_create_group(kobj, &dql_group);
1339	if (error) {
1340		kobject_put(kobj);
1341		return error;
1342	}
1343#endif
1344
1345	kobject_uevent(kobj, KOBJ_ADD);
1346	dev_hold(queue->dev);
1347
1348	return 0;
 
 
 
1349}
1350#endif /* CONFIG_SYSFS */
1351
1352int
1353netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1354{
1355#ifdef CONFIG_SYSFS
1356	int i;
1357	int error = 0;
1358
1359	for (i = old_num; i < new_num; i++) {
1360		error = netdev_queue_add_kobject(dev, i);
1361		if (error) {
1362			new_num = old_num;
1363			break;
1364		}
1365	}
1366
1367	while (--i >= new_num) {
1368		struct netdev_queue *queue = dev->_tx + i;
1369
1370		if (!refcount_read(&dev_net(dev)->count))
1371			queue->kobj.uevent_suppress = 1;
1372#ifdef CONFIG_BQL
1373		sysfs_remove_group(&queue->kobj, &dql_group);
1374#endif
1375		kobject_put(&queue->kobj);
1376	}
1377
1378	return error;
1379#else
1380	return 0;
1381#endif /* CONFIG_SYSFS */
1382}
1383
1384static int register_queue_kobjects(struct net_device *dev)
1385{
1386	int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1387
1388#ifdef CONFIG_SYSFS
1389	dev->queues_kset = kset_create_and_add("queues",
1390					       NULL, &dev->dev.kobj);
1391	if (!dev->queues_kset)
1392		return -ENOMEM;
1393	real_rx = dev->real_num_rx_queues;
1394#endif
1395	real_tx = dev->real_num_tx_queues;
1396
1397	error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1398	if (error)
1399		goto error;
1400	rxq = real_rx;
1401
1402	error = netdev_queue_update_kobjects(dev, 0, real_tx);
1403	if (error)
1404		goto error;
1405	txq = real_tx;
1406
1407	return 0;
1408
1409error:
1410	netdev_queue_update_kobjects(dev, txq, 0);
1411	net_rx_queue_update_kobjects(dev, rxq, 0);
1412	return error;
1413}
1414
1415static void remove_queue_kobjects(struct net_device *dev)
1416{
1417	int real_rx = 0, real_tx = 0;
1418
1419#ifdef CONFIG_SYSFS
1420	real_rx = dev->real_num_rx_queues;
1421#endif
1422	real_tx = dev->real_num_tx_queues;
1423
1424	net_rx_queue_update_kobjects(dev, real_rx, 0);
1425	netdev_queue_update_kobjects(dev, real_tx, 0);
1426#ifdef CONFIG_SYSFS
1427	kset_unregister(dev->queues_kset);
1428#endif
1429}
1430
1431static bool net_current_may_mount(void)
1432{
1433	struct net *net = current->nsproxy->net_ns;
1434
1435	return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1436}
1437
1438static void *net_grab_current_ns(void)
1439{
1440	struct net *ns = current->nsproxy->net_ns;
1441#ifdef CONFIG_NET_NS
1442	if (ns)
1443		refcount_inc(&ns->passive);
1444#endif
1445	return ns;
1446}
1447
1448static const void *net_initial_ns(void)
1449{
1450	return &init_net;
1451}
1452
1453static const void *net_netlink_ns(struct sock *sk)
1454{
1455	return sock_net(sk);
1456}
1457
1458const struct kobj_ns_type_operations net_ns_type_operations = {
1459	.type = KOBJ_NS_TYPE_NET,
1460	.current_may_mount = net_current_may_mount,
1461	.grab_current_ns = net_grab_current_ns,
1462	.netlink_ns = net_netlink_ns,
1463	.initial_ns = net_initial_ns,
1464	.drop_ns = net_drop_ns,
1465};
1466EXPORT_SYMBOL_GPL(net_ns_type_operations);
1467
1468static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1469{
1470	struct net_device *dev = to_net_dev(d);
1471	int retval;
1472
1473	/* pass interface to uevent. */
1474	retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1475	if (retval)
1476		goto exit;
1477
1478	/* pass ifindex to uevent.
1479	 * ifindex is useful as it won't change (interface name may change)
1480	 * and is what RtNetlink uses natively.
1481	 */
1482	retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1483
1484exit:
1485	return retval;
1486}
1487
1488/*
1489 *	netdev_release -- destroy and free a dead device.
1490 *	Called when last reference to device kobject is gone.
1491 */
1492static void netdev_release(struct device *d)
1493{
1494	struct net_device *dev = to_net_dev(d);
1495
1496	BUG_ON(dev->reg_state != NETREG_RELEASED);
1497
1498	/* no need to wait for rcu grace period:
1499	 * device is dead and about to be freed.
1500	 */
1501	kfree(rcu_access_pointer(dev->ifalias));
1502	netdev_freemem(dev);
1503}
1504
1505static const void *net_namespace(struct device *d)
1506{
1507	struct net_device *dev = to_net_dev(d);
1508
1509	return dev_net(dev);
1510}
1511
1512static struct class net_class __ro_after_init = {
1513	.name = "net",
1514	.dev_release = netdev_release,
1515	.dev_groups = net_class_groups,
1516	.dev_uevent = netdev_uevent,
1517	.ns_type = &net_ns_type_operations,
1518	.namespace = net_namespace,
1519};
1520
1521#ifdef CONFIG_OF_NET
1522static int of_dev_node_match(struct device *dev, const void *data)
1523{
1524	int ret = 0;
1525
1526	if (dev->parent)
1527		ret = dev->parent->of_node == data;
1528
1529	return ret == 0 ? dev->of_node == data : ret;
1530}
1531
1532/*
1533 * of_find_net_device_by_node - lookup the net device for the device node
1534 * @np: OF device node
1535 *
1536 * Looks up the net_device structure corresponding with the device node.
1537 * If successful, returns a pointer to the net_device with the embedded
1538 * struct device refcount incremented by one, or NULL on failure. The
1539 * refcount must be dropped when done with the net_device.
1540 */
1541struct net_device *of_find_net_device_by_node(struct device_node *np)
1542{
1543	struct device *dev;
1544
1545	dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1546	if (!dev)
1547		return NULL;
1548
1549	return to_net_dev(dev);
1550}
1551EXPORT_SYMBOL(of_find_net_device_by_node);
1552#endif
1553
1554/* Delete sysfs entries but hold kobject reference until after all
1555 * netdev references are gone.
1556 */
1557void netdev_unregister_kobject(struct net_device *ndev)
1558{
1559	struct device *dev = &ndev->dev;
1560
1561	if (!refcount_read(&dev_net(ndev)->count))
1562		dev_set_uevent_suppress(dev, 1);
1563
1564	kobject_get(&dev->kobj);
1565
1566	remove_queue_kobjects(ndev);
1567
1568	pm_runtime_set_memalloc_noio(dev, false);
1569
1570	device_del(dev);
1571}
1572
1573/* Create sysfs entries for network device. */
1574int netdev_register_kobject(struct net_device *ndev)
1575{
1576	struct device *dev = &ndev->dev;
1577	const struct attribute_group **groups = ndev->sysfs_groups;
1578	int error = 0;
1579
1580	device_initialize(dev);
1581	dev->class = &net_class;
1582	dev->platform_data = ndev;
1583	dev->groups = groups;
1584
1585	dev_set_name(dev, "%s", ndev->name);
1586
1587#ifdef CONFIG_SYSFS
1588	/* Allow for a device specific group */
1589	if (*groups)
1590		groups++;
1591
1592	*groups++ = &netstat_group;
1593
1594#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1595	if (ndev->ieee80211_ptr)
1596		*groups++ = &wireless_group;
1597#if IS_ENABLED(CONFIG_WIRELESS_EXT)
1598	else if (ndev->wireless_handlers)
1599		*groups++ = &wireless_group;
1600#endif
1601#endif
1602#endif /* CONFIG_SYSFS */
1603
1604	error = device_add(dev);
1605	if (error)
1606		return error;
1607
1608	error = register_queue_kobjects(ndev);
1609	if (error) {
1610		device_del(dev);
1611		return error;
1612	}
1613
1614	pm_runtime_set_memalloc_noio(dev, true);
1615
1616	return error;
1617}
1618
1619int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1620				const void *ns)
1621{
1622	return class_create_file_ns(&net_class, class_attr, ns);
1623}
1624EXPORT_SYMBOL(netdev_class_create_file_ns);
1625
1626void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1627				 const void *ns)
1628{
1629	class_remove_file_ns(&net_class, class_attr, ns);
1630}
1631EXPORT_SYMBOL(netdev_class_remove_file_ns);
1632
1633int __init netdev_kobject_init(void)
1634{
1635	kobj_ns_type_register(&net_ns_type_operations);
1636	return class_register(&net_class);
1637}