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#include <net/netdev_rx_queue.h>
  27#include <net/rps.h>
  28
  29#include "dev.h"
  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
  38/* Caller holds RTNL or RCU */
  39static inline int dev_isalive(const struct net_device *dev)
  40{
  41	return READ_ONCE(dev->reg_state) <= NETREG_REGISTERED;
  42}
  43
  44/* use same locking rules as GIF* ioctl's */
  45static ssize_t netdev_show(const struct device *dev,
  46			   struct device_attribute *attr, char *buf,
  47			   ssize_t (*format)(const struct net_device *, char *))
  48{
  49	struct net_device *ndev = to_net_dev(dev);
  50	ssize_t ret = -EINVAL;
  51
  52	rcu_read_lock();
  53	if (dev_isalive(ndev))
  54		ret = (*format)(ndev, buf);
  55	rcu_read_unlock();
  56
  57	return ret;
  58}
  59
  60/* generate a show function for simple field */
  61#define NETDEVICE_SHOW(field, format_string)				\
  62static ssize_t format_##field(const struct net_device *dev, char *buf)	\
  63{									\
  64	return sysfs_emit(buf, format_string, READ_ONCE(dev->field));		\
  65}									\
  66static ssize_t field##_show(struct device *dev,				\
  67			    struct device_attribute *attr, char *buf)	\
  68{									\
  69	return netdev_show(dev, attr, buf, format_##field);		\
  70}									\
  71
  72#define NETDEVICE_SHOW_RO(field, format_string)				\
  73NETDEVICE_SHOW(field, format_string);					\
  74static DEVICE_ATTR_RO(field)
  75
  76#define NETDEVICE_SHOW_RW(field, format_string)				\
  77NETDEVICE_SHOW(field, format_string);					\
  78static DEVICE_ATTR_RW(field)
  79
  80/* use same locking and permission rules as SIF* ioctl's */
  81static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  82			    const char *buf, size_t len,
  83			    int (*set)(struct net_device *, unsigned long))
  84{
  85	struct net_device *netdev = to_net_dev(dev);
  86	struct net *net = dev_net(netdev);
  87	unsigned long new;
  88	int ret;
  89
  90	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  91		return -EPERM;
  92
  93	ret = kstrtoul(buf, 0, &new);
  94	if (ret)
  95		goto err;
  96
  97	if (!rtnl_trylock())
  98		return restart_syscall();
  99
 100	if (dev_isalive(netdev)) {
 101		ret = (*set)(netdev, new);
 102		if (ret == 0)
 103			ret = len;
 104	}
 105	rtnl_unlock();
 106 err:
 107	return ret;
 108}
 109
 110NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 111NETDEVICE_SHOW_RO(dev_port, fmt_dec);
 112NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 113NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 114NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 115NETDEVICE_SHOW_RO(type, fmt_dec);
 116NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 117
 118static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
 119			   char *buf)
 120{
 121	struct net_device *ndev = to_net_dev(dev);
 122
 123	return sysfs_emit(buf, fmt_dec, dev_get_iflink(ndev));
 124}
 125static DEVICE_ATTR_RO(iflink);
 126
 127static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
 128{
 129	return sysfs_emit(buf, fmt_dec, READ_ONCE(dev->name_assign_type));
 130}
 131
 132static ssize_t name_assign_type_show(struct device *dev,
 133				     struct device_attribute *attr,
 134				     char *buf)
 135{
 136	struct net_device *ndev = to_net_dev(dev);
 137	ssize_t ret = -EINVAL;
 138
 139	if (READ_ONCE(ndev->name_assign_type) != NET_NAME_UNKNOWN)
 140		ret = netdev_show(dev, attr, buf, format_name_assign_type);
 141
 142	return ret;
 143}
 144static DEVICE_ATTR_RO(name_assign_type);
 145
 146/* use same locking rules as GIFHWADDR ioctl's (dev_get_mac_address()) */
 147static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 148			    char *buf)
 149{
 150	struct net_device *ndev = to_net_dev(dev);
 151	ssize_t ret = -EINVAL;
 152
 153	down_read(&dev_addr_sem);
 154
 155	rcu_read_lock();
 156	if (dev_isalive(ndev))
 157		ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
 158	rcu_read_unlock();
 159
 160	up_read(&dev_addr_sem);
 161	return ret;
 162}
 163static DEVICE_ATTR_RO(address);
 164
 165static ssize_t broadcast_show(struct device *dev,
 166			      struct device_attribute *attr, char *buf)
 167{
 168	struct net_device *ndev = to_net_dev(dev);
 169	int ret = -EINVAL;
 170
 171	rcu_read_lock();
 172	if (dev_isalive(ndev))
 173		ret = sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
 174	rcu_read_unlock();
 175	return ret;
 176}
 177static DEVICE_ATTR_RO(broadcast);
 178
 179static int change_carrier(struct net_device *dev, unsigned long new_carrier)
 180{
 181	if (!netif_running(dev))
 182		return -EINVAL;
 183	return dev_change_carrier(dev, (bool)new_carrier);
 184}
 185
 186static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 187			     const char *buf, size_t len)
 188{
 189	struct net_device *netdev = to_net_dev(dev);
 190
 191	/* The check is also done in change_carrier; this helps returning early
 192	 * without hitting the trylock/restart in netdev_store.
 193	 */
 194	if (!netdev->netdev_ops->ndo_change_carrier)
 195		return -EOPNOTSUPP;
 196
 197	return netdev_store(dev, attr, buf, len, change_carrier);
 198}
 199
 200static ssize_t carrier_show(struct device *dev,
 201			    struct device_attribute *attr, char *buf)
 202{
 203	struct net_device *netdev = to_net_dev(dev);
 204	int ret = -EINVAL;
 205
 206	if (!rtnl_trylock())
 207		return restart_syscall();
 208
 209	if (netif_running(netdev)) {
 210		/* Synchronize carrier state with link watch,
 211		 * see also rtnl_getlink().
 212		 */
 213		linkwatch_sync_dev(netdev);
 214
 215		ret = sysfs_emit(buf, fmt_dec, !!netif_carrier_ok(netdev));
 216	}
 217	rtnl_unlock();
 218
 219	return ret;
 220}
 221static DEVICE_ATTR_RW(carrier);
 222
 223static ssize_t speed_show(struct device *dev,
 224			  struct device_attribute *attr, char *buf)
 225{
 226	struct net_device *netdev = to_net_dev(dev);
 227	int ret = -EINVAL;
 228
 229	/* The check is also done in __ethtool_get_link_ksettings; this helps
 230	 * returning early without hitting the trylock/restart below.
 231	 */
 232	if (!netdev->ethtool_ops->get_link_ksettings)
 233		return ret;
 234
 235	if (!rtnl_trylock())
 236		return restart_syscall();
 237
 238	if (netif_running(netdev) && netif_device_present(netdev)) {
 239		struct ethtool_link_ksettings cmd;
 240
 241		if (!__ethtool_get_link_ksettings(netdev, &cmd))
 242			ret = sysfs_emit(buf, fmt_dec, cmd.base.speed);
 243	}
 244	rtnl_unlock();
 245	return ret;
 246}
 247static DEVICE_ATTR_RO(speed);
 248
 249static ssize_t duplex_show(struct device *dev,
 250			   struct device_attribute *attr, char *buf)
 251{
 252	struct net_device *netdev = to_net_dev(dev);
 253	int ret = -EINVAL;
 254
 255	/* The check is also done in __ethtool_get_link_ksettings; this helps
 256	 * returning early without hitting the trylock/restart below.
 257	 */
 258	if (!netdev->ethtool_ops->get_link_ksettings)
 259		return ret;
 260
 261	if (!rtnl_trylock())
 262		return restart_syscall();
 263
 264	if (netif_running(netdev)) {
 265		struct ethtool_link_ksettings cmd;
 266
 267		if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
 268			const char *duplex;
 269
 270			switch (cmd.base.duplex) {
 271			case DUPLEX_HALF:
 272				duplex = "half";
 273				break;
 274			case DUPLEX_FULL:
 275				duplex = "full";
 276				break;
 277			default:
 278				duplex = "unknown";
 279				break;
 280			}
 281			ret = sysfs_emit(buf, "%s\n", duplex);
 282		}
 283	}
 284	rtnl_unlock();
 285	return ret;
 286}
 287static DEVICE_ATTR_RO(duplex);
 288
 289static ssize_t testing_show(struct device *dev,
 290			    struct device_attribute *attr, char *buf)
 291{
 292	struct net_device *netdev = to_net_dev(dev);
 293
 294	if (netif_running(netdev))
 295		return sysfs_emit(buf, fmt_dec, !!netif_testing(netdev));
 296
 297	return -EINVAL;
 298}
 299static DEVICE_ATTR_RO(testing);
 300
 301static ssize_t dormant_show(struct device *dev,
 302			    struct device_attribute *attr, char *buf)
 303{
 304	struct net_device *netdev = to_net_dev(dev);
 305
 306	if (netif_running(netdev))
 307		return sysfs_emit(buf, fmt_dec, !!netif_dormant(netdev));
 308
 309	return -EINVAL;
 310}
 311static DEVICE_ATTR_RO(dormant);
 312
 313static const char *const operstates[] = {
 314	"unknown",
 315	"notpresent", /* currently unused */
 316	"down",
 317	"lowerlayerdown",
 318	"testing",
 319	"dormant",
 320	"up"
 321};
 322
 323static ssize_t operstate_show(struct device *dev,
 324			      struct device_attribute *attr, char *buf)
 325{
 326	const struct net_device *netdev = to_net_dev(dev);
 327	unsigned char operstate;
 328
 329	operstate = READ_ONCE(netdev->operstate);
 
 330	if (!netif_running(netdev))
 331		operstate = IF_OPER_DOWN;
 
 332
 333	if (operstate >= ARRAY_SIZE(operstates))
 334		return -EINVAL; /* should not happen */
 335
 336	return sysfs_emit(buf, "%s\n", operstates[operstate]);
 337}
 338static DEVICE_ATTR_RO(operstate);
 339
 340static ssize_t carrier_changes_show(struct device *dev,
 341				    struct device_attribute *attr,
 342				    char *buf)
 343{
 344	struct net_device *netdev = to_net_dev(dev);
 345
 346	return sysfs_emit(buf, fmt_dec,
 347			  atomic_read(&netdev->carrier_up_count) +
 348			  atomic_read(&netdev->carrier_down_count));
 349}
 350static DEVICE_ATTR_RO(carrier_changes);
 351
 352static ssize_t carrier_up_count_show(struct device *dev,
 353				     struct device_attribute *attr,
 354				     char *buf)
 355{
 356	struct net_device *netdev = to_net_dev(dev);
 357
 358	return sysfs_emit(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
 359}
 360static DEVICE_ATTR_RO(carrier_up_count);
 361
 362static ssize_t carrier_down_count_show(struct device *dev,
 363				       struct device_attribute *attr,
 364				       char *buf)
 365{
 366	struct net_device *netdev = to_net_dev(dev);
 367
 368	return sysfs_emit(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
 369}
 370static DEVICE_ATTR_RO(carrier_down_count);
 371
 372/* read-write attributes */
 373
 374static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 375{
 376	return dev_set_mtu(dev, (int)new_mtu);
 377}
 378
 379static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 380			 const char *buf, size_t len)
 381{
 382	return netdev_store(dev, attr, buf, len, change_mtu);
 383}
 384NETDEVICE_SHOW_RW(mtu, fmt_dec);
 385
 386static int change_flags(struct net_device *dev, unsigned long new_flags)
 387{
 388	return dev_change_flags(dev, (unsigned int)new_flags, NULL);
 389}
 390
 391static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 392			   const char *buf, size_t len)
 393{
 394	return netdev_store(dev, attr, buf, len, change_flags);
 395}
 396NETDEVICE_SHOW_RW(flags, fmt_hex);
 397
 398static ssize_t tx_queue_len_store(struct device *dev,
 399				  struct device_attribute *attr,
 400				  const char *buf, size_t len)
 401{
 402	if (!capable(CAP_NET_ADMIN))
 403		return -EPERM;
 404
 405	return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
 406}
 407NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
 408
 409static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 410{
 411	WRITE_ONCE(dev->gro_flush_timeout, val);
 412	return 0;
 413}
 414
 415static ssize_t gro_flush_timeout_store(struct device *dev,
 416				       struct device_attribute *attr,
 417				       const char *buf, size_t len)
 418{
 419	if (!capable(CAP_NET_ADMIN))
 420		return -EPERM;
 421
 422	return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 423}
 424NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 425
 426static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val)
 427{
 428	WRITE_ONCE(dev->napi_defer_hard_irqs, val);
 429	return 0;
 430}
 431
 432static ssize_t napi_defer_hard_irqs_store(struct device *dev,
 433					  struct device_attribute *attr,
 434					  const char *buf, size_t len)
 435{
 436	if (!capable(CAP_NET_ADMIN))
 437		return -EPERM;
 438
 439	return netdev_store(dev, attr, buf, len, change_napi_defer_hard_irqs);
 440}
 441NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_dec);
 442
 443static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 444			     const char *buf, size_t len)
 445{
 446	struct net_device *netdev = to_net_dev(dev);
 447	struct net *net = dev_net(netdev);
 448	size_t count = len;
 449	ssize_t ret = 0;
 450
 451	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 452		return -EPERM;
 453
 454	/* ignore trailing newline */
 455	if (len >  0 && buf[len - 1] == '\n')
 456		--count;
 457
 458	if (!rtnl_trylock())
 459		return restart_syscall();
 460
 461	if (dev_isalive(netdev)) {
 462		ret = dev_set_alias(netdev, buf, count);
 463		if (ret < 0)
 464			goto err;
 465		ret = len;
 466		netdev_state_change(netdev);
 467	}
 468err:
 469	rtnl_unlock();
 470
 471	return ret;
 472}
 473
 474static ssize_t ifalias_show(struct device *dev,
 475			    struct device_attribute *attr, char *buf)
 476{
 477	const struct net_device *netdev = to_net_dev(dev);
 478	char tmp[IFALIASZ];
 479	ssize_t ret = 0;
 480
 481	ret = dev_get_alias(netdev, tmp, sizeof(tmp));
 482	if (ret > 0)
 483		ret = sysfs_emit(buf, "%s\n", tmp);
 484	return ret;
 485}
 486static DEVICE_ATTR_RW(ifalias);
 487
 488static int change_group(struct net_device *dev, unsigned long new_group)
 489{
 490	dev_set_group(dev, (int)new_group);
 491	return 0;
 492}
 493
 494static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 495			   const char *buf, size_t len)
 496{
 497	return netdev_store(dev, attr, buf, len, change_group);
 498}
 499NETDEVICE_SHOW(group, fmt_dec);
 500static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
 501
 502static int change_proto_down(struct net_device *dev, unsigned long proto_down)
 503{
 504	return dev_change_proto_down(dev, (bool)proto_down);
 505}
 506
 507static ssize_t proto_down_store(struct device *dev,
 508				struct device_attribute *attr,
 509				const char *buf, size_t len)
 510{
 511	return netdev_store(dev, attr, buf, len, change_proto_down);
 512}
 513NETDEVICE_SHOW_RW(proto_down, fmt_dec);
 514
 515static ssize_t phys_port_id_show(struct device *dev,
 516				 struct device_attribute *attr, char *buf)
 517{
 518	struct net_device *netdev = to_net_dev(dev);
 519	ssize_t ret = -EINVAL;
 520
 521	/* The check is also done in dev_get_phys_port_id; this helps returning
 522	 * early without hitting the trylock/restart below.
 523	 */
 524	if (!netdev->netdev_ops->ndo_get_phys_port_id)
 525		return -EOPNOTSUPP;
 526
 527	if (!rtnl_trylock())
 528		return restart_syscall();
 529
 530	if (dev_isalive(netdev)) {
 531		struct netdev_phys_item_id ppid;
 532
 533		ret = dev_get_phys_port_id(netdev, &ppid);
 534		if (!ret)
 535			ret = sysfs_emit(buf, "%*phN\n", ppid.id_len, ppid.id);
 536	}
 537	rtnl_unlock();
 538
 539	return ret;
 540}
 541static DEVICE_ATTR_RO(phys_port_id);
 542
 543static ssize_t phys_port_name_show(struct device *dev,
 544				   struct device_attribute *attr, char *buf)
 545{
 546	struct net_device *netdev = to_net_dev(dev);
 547	ssize_t ret = -EINVAL;
 548
 549	/* The checks are also done in dev_get_phys_port_name; this helps
 550	 * returning early without hitting the trylock/restart below.
 551	 */
 552	if (!netdev->netdev_ops->ndo_get_phys_port_name &&
 553	    !netdev->devlink_port)
 554		return -EOPNOTSUPP;
 555
 556	if (!rtnl_trylock())
 557		return restart_syscall();
 558
 559	if (dev_isalive(netdev)) {
 560		char name[IFNAMSIZ];
 561
 562		ret = dev_get_phys_port_name(netdev, name, sizeof(name));
 563		if (!ret)
 564			ret = sysfs_emit(buf, "%s\n", name);
 565	}
 566	rtnl_unlock();
 567
 568	return ret;
 569}
 570static DEVICE_ATTR_RO(phys_port_name);
 571
 572static ssize_t phys_switch_id_show(struct device *dev,
 573				   struct device_attribute *attr, char *buf)
 574{
 575	struct net_device *netdev = to_net_dev(dev);
 576	ssize_t ret = -EINVAL;
 577
 578	/* The checks are also done in dev_get_phys_port_name; this helps
 579	 * returning early without hitting the trylock/restart below. This works
 580	 * because recurse is false when calling dev_get_port_parent_id.
 581	 */
 582	if (!netdev->netdev_ops->ndo_get_port_parent_id &&
 583	    !netdev->devlink_port)
 584		return -EOPNOTSUPP;
 585
 586	if (!rtnl_trylock())
 587		return restart_syscall();
 588
 589	if (dev_isalive(netdev)) {
 590		struct netdev_phys_item_id ppid = { };
 
 
 
 
 591
 592		ret = dev_get_port_parent_id(netdev, &ppid, false);
 593		if (!ret)
 594			ret = sysfs_emit(buf, "%*phN\n", ppid.id_len, ppid.id);
 
 595	}
 596	rtnl_unlock();
 597
 598	return ret;
 599}
 600static DEVICE_ATTR_RO(phys_switch_id);
 601
 602static ssize_t threaded_show(struct device *dev,
 603			     struct device_attribute *attr, char *buf)
 604{
 605	struct net_device *netdev = to_net_dev(dev);
 606	ssize_t ret = -EINVAL;
 607
 608	if (!rtnl_trylock())
 609		return restart_syscall();
 610
 611	if (dev_isalive(netdev))
 612		ret = sysfs_emit(buf, fmt_dec, netdev->threaded);
 613
 614	rtnl_unlock();
 615	return ret;
 616}
 617
 618static int modify_napi_threaded(struct net_device *dev, unsigned long val)
 619{
 620	int ret;
 621
 622	if (list_empty(&dev->napi_list))
 623		return -EOPNOTSUPP;
 624
 625	if (val != 0 && val != 1)
 626		return -EOPNOTSUPP;
 627
 628	ret = dev_set_threaded(dev, val);
 629
 630	return ret;
 631}
 632
 633static ssize_t threaded_store(struct device *dev,
 634			      struct device_attribute *attr,
 635			      const char *buf, size_t len)
 636{
 637	return netdev_store(dev, attr, buf, len, modify_napi_threaded);
 638}
 639static DEVICE_ATTR_RW(threaded);
 640
 641static struct attribute *net_class_attrs[] __ro_after_init = {
 642	&dev_attr_netdev_group.attr,
 643	&dev_attr_type.attr,
 644	&dev_attr_dev_id.attr,
 645	&dev_attr_dev_port.attr,
 646	&dev_attr_iflink.attr,
 647	&dev_attr_ifindex.attr,
 648	&dev_attr_name_assign_type.attr,
 649	&dev_attr_addr_assign_type.attr,
 650	&dev_attr_addr_len.attr,
 651	&dev_attr_link_mode.attr,
 652	&dev_attr_address.attr,
 653	&dev_attr_broadcast.attr,
 654	&dev_attr_speed.attr,
 655	&dev_attr_duplex.attr,
 656	&dev_attr_dormant.attr,
 657	&dev_attr_testing.attr,
 658	&dev_attr_operstate.attr,
 659	&dev_attr_carrier_changes.attr,
 660	&dev_attr_ifalias.attr,
 661	&dev_attr_carrier.attr,
 662	&dev_attr_mtu.attr,
 663	&dev_attr_flags.attr,
 664	&dev_attr_tx_queue_len.attr,
 665	&dev_attr_gro_flush_timeout.attr,
 666	&dev_attr_napi_defer_hard_irqs.attr,
 667	&dev_attr_phys_port_id.attr,
 668	&dev_attr_phys_port_name.attr,
 669	&dev_attr_phys_switch_id.attr,
 670	&dev_attr_proto_down.attr,
 671	&dev_attr_carrier_up_count.attr,
 672	&dev_attr_carrier_down_count.attr,
 673	&dev_attr_threaded.attr,
 674	NULL,
 675};
 676ATTRIBUTE_GROUPS(net_class);
 677
 678/* Show a given an attribute in the statistics group */
 679static ssize_t netstat_show(const struct device *d,
 680			    struct device_attribute *attr, char *buf,
 681			    unsigned long offset)
 682{
 683	struct net_device *dev = to_net_dev(d);
 684	ssize_t ret = -EINVAL;
 685
 686	WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 687		offset % sizeof(u64) != 0);
 688
 689	rcu_read_lock();
 690	if (dev_isalive(dev)) {
 691		struct rtnl_link_stats64 temp;
 692		const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 693
 694		ret = sysfs_emit(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
 695	}
 696	rcu_read_unlock();
 697	return ret;
 698}
 699
 700/* generate a read-only statistics attribute */
 701#define NETSTAT_ENTRY(name)						\
 702static ssize_t name##_show(struct device *d,				\
 703			   struct device_attribute *attr, char *buf)	\
 704{									\
 705	return netstat_show(d, attr, buf,				\
 706			    offsetof(struct rtnl_link_stats64, name));	\
 707}									\
 708static DEVICE_ATTR_RO(name)
 709
 710NETSTAT_ENTRY(rx_packets);
 711NETSTAT_ENTRY(tx_packets);
 712NETSTAT_ENTRY(rx_bytes);
 713NETSTAT_ENTRY(tx_bytes);
 714NETSTAT_ENTRY(rx_errors);
 715NETSTAT_ENTRY(tx_errors);
 716NETSTAT_ENTRY(rx_dropped);
 717NETSTAT_ENTRY(tx_dropped);
 718NETSTAT_ENTRY(multicast);
 719NETSTAT_ENTRY(collisions);
 720NETSTAT_ENTRY(rx_length_errors);
 721NETSTAT_ENTRY(rx_over_errors);
 722NETSTAT_ENTRY(rx_crc_errors);
 723NETSTAT_ENTRY(rx_frame_errors);
 724NETSTAT_ENTRY(rx_fifo_errors);
 725NETSTAT_ENTRY(rx_missed_errors);
 726NETSTAT_ENTRY(tx_aborted_errors);
 727NETSTAT_ENTRY(tx_carrier_errors);
 728NETSTAT_ENTRY(tx_fifo_errors);
 729NETSTAT_ENTRY(tx_heartbeat_errors);
 730NETSTAT_ENTRY(tx_window_errors);
 731NETSTAT_ENTRY(rx_compressed);
 732NETSTAT_ENTRY(tx_compressed);
 733NETSTAT_ENTRY(rx_nohandler);
 734
 735static struct attribute *netstat_attrs[] __ro_after_init = {
 736	&dev_attr_rx_packets.attr,
 737	&dev_attr_tx_packets.attr,
 738	&dev_attr_rx_bytes.attr,
 739	&dev_attr_tx_bytes.attr,
 740	&dev_attr_rx_errors.attr,
 741	&dev_attr_tx_errors.attr,
 742	&dev_attr_rx_dropped.attr,
 743	&dev_attr_tx_dropped.attr,
 744	&dev_attr_multicast.attr,
 745	&dev_attr_collisions.attr,
 746	&dev_attr_rx_length_errors.attr,
 747	&dev_attr_rx_over_errors.attr,
 748	&dev_attr_rx_crc_errors.attr,
 749	&dev_attr_rx_frame_errors.attr,
 750	&dev_attr_rx_fifo_errors.attr,
 751	&dev_attr_rx_missed_errors.attr,
 752	&dev_attr_tx_aborted_errors.attr,
 753	&dev_attr_tx_carrier_errors.attr,
 754	&dev_attr_tx_fifo_errors.attr,
 755	&dev_attr_tx_heartbeat_errors.attr,
 756	&dev_attr_tx_window_errors.attr,
 757	&dev_attr_rx_compressed.attr,
 758	&dev_attr_tx_compressed.attr,
 759	&dev_attr_rx_nohandler.attr,
 760	NULL
 761};
 762
 763static const struct attribute_group netstat_group = {
 764	.name  = "statistics",
 765	.attrs  = netstat_attrs,
 766};
 767
 
 768static struct attribute *wireless_attrs[] = {
 769	NULL
 770};
 771
 772static const struct attribute_group wireless_group = {
 773	.name = "wireless",
 774	.attrs = wireless_attrs,
 775};
 776
 777static bool wireless_group_needed(struct net_device *ndev)
 778{
 779#if IS_ENABLED(CONFIG_CFG80211)
 780	if (ndev->ieee80211_ptr)
 781		return true;
 782#endif
 783#if IS_ENABLED(CONFIG_WIRELESS_EXT)
 784	if (ndev->wireless_handlers)
 785		return true;
 786#endif
 787	return false;
 788}
 789
 790#else /* CONFIG_SYSFS */
 791#define net_class_groups	NULL
 792#endif /* CONFIG_SYSFS */
 793
 794#ifdef CONFIG_SYSFS
 795#define to_rx_queue_attr(_attr) \
 796	container_of(_attr, struct rx_queue_attribute, attr)
 797
 798#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 799
 800static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 801				  char *buf)
 802{
 803	const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 804	struct netdev_rx_queue *queue = to_rx_queue(kobj);
 805
 806	if (!attribute->show)
 807		return -EIO;
 808
 809	return attribute->show(queue, buf);
 810}
 811
 812static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 813				   const char *buf, size_t count)
 814{
 815	const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 816	struct netdev_rx_queue *queue = to_rx_queue(kobj);
 817
 818	if (!attribute->store)
 819		return -EIO;
 820
 821	return attribute->store(queue, buf, count);
 822}
 823
 824static const struct sysfs_ops rx_queue_sysfs_ops = {
 825	.show = rx_queue_attr_show,
 826	.store = rx_queue_attr_store,
 827};
 828
 829#ifdef CONFIG_RPS
 830static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
 831{
 832	struct rps_map *map;
 833	cpumask_var_t mask;
 834	int i, len;
 835
 836	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 837		return -ENOMEM;
 838
 839	rcu_read_lock();
 840	map = rcu_dereference(queue->rps_map);
 841	if (map)
 842		for (i = 0; i < map->len; i++)
 843			cpumask_set_cpu(map->cpus[i], mask);
 844
 845	len = sysfs_emit(buf, "%*pb\n", cpumask_pr_args(mask));
 846	rcu_read_unlock();
 847	free_cpumask_var(mask);
 848
 849	return len < PAGE_SIZE ? len : -EINVAL;
 850}
 851
 852static int netdev_rx_queue_set_rps_mask(struct netdev_rx_queue *queue,
 853					cpumask_var_t mask)
 854{
 855	static DEFINE_MUTEX(rps_map_mutex);
 856	struct rps_map *old_map, *map;
 857	int cpu, i;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 858
 859	map = kzalloc(max_t(unsigned int,
 860			    RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 861		      GFP_KERNEL);
 862	if (!map)
 
 863		return -ENOMEM;
 
 864
 865	i = 0;
 866	for_each_cpu_and(cpu, mask, cpu_online_mask)
 867		map->cpus[i++] = cpu;
 868
 869	if (i) {
 870		map->len = i;
 871	} else {
 872		kfree(map);
 873		map = NULL;
 874	}
 875
 876	mutex_lock(&rps_map_mutex);
 877	old_map = rcu_dereference_protected(queue->rps_map,
 878					    mutex_is_locked(&rps_map_mutex));
 879	rcu_assign_pointer(queue->rps_map, map);
 880
 881	if (map)
 882		static_branch_inc(&rps_needed);
 883	if (old_map)
 884		static_branch_dec(&rps_needed);
 885
 886	mutex_unlock(&rps_map_mutex);
 887
 888	if (old_map)
 889		kfree_rcu(old_map, rcu);
 890	return 0;
 891}
 892
 893int rps_cpumask_housekeeping(struct cpumask *mask)
 894{
 895	if (!cpumask_empty(mask)) {
 896		cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_DOMAIN));
 897		cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_WQ));
 898		if (cpumask_empty(mask))
 899			return -EINVAL;
 900	}
 901	return 0;
 902}
 903
 904static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 905			     const char *buf, size_t len)
 906{
 907	cpumask_var_t mask;
 908	int err;
 909
 910	if (!capable(CAP_NET_ADMIN))
 911		return -EPERM;
 912
 913	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 914		return -ENOMEM;
 915
 916	err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 917	if (err)
 918		goto out;
 919
 920	err = rps_cpumask_housekeeping(mask);
 921	if (err)
 922		goto out;
 923
 924	err = netdev_rx_queue_set_rps_mask(queue, mask);
 925
 926out:
 927	free_cpumask_var(mask);
 928	return err ? : len;
 929}
 930
 931static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 932					   char *buf)
 933{
 934	struct rps_dev_flow_table *flow_table;
 935	unsigned long val = 0;
 936
 937	rcu_read_lock();
 938	flow_table = rcu_dereference(queue->rps_flow_table);
 939	if (flow_table)
 940		val = (unsigned long)flow_table->mask + 1;
 941	rcu_read_unlock();
 942
 943	return sysfs_emit(buf, "%lu\n", val);
 944}
 945
 946static void rps_dev_flow_table_release(struct rcu_head *rcu)
 947{
 948	struct rps_dev_flow_table *table = container_of(rcu,
 949	    struct rps_dev_flow_table, rcu);
 950	vfree(table);
 951}
 952
 953static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 954					    const char *buf, size_t len)
 955{
 956	unsigned long mask, count;
 957	struct rps_dev_flow_table *table, *old_table;
 958	static DEFINE_SPINLOCK(rps_dev_flow_lock);
 959	int rc;
 960
 961	if (!capable(CAP_NET_ADMIN))
 962		return -EPERM;
 963
 964	rc = kstrtoul(buf, 0, &count);
 965	if (rc < 0)
 966		return rc;
 967
 968	if (count) {
 969		mask = count - 1;
 970		/* mask = roundup_pow_of_two(count) - 1;
 971		 * without overflows...
 972		 */
 973		while ((mask | (mask >> 1)) != mask)
 974			mask |= (mask >> 1);
 975		/* On 64 bit arches, must check mask fits in table->mask (u32),
 976		 * and on 32bit arches, must check
 977		 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 978		 */
 979#if BITS_PER_LONG > 32
 980		if (mask > (unsigned long)(u32)mask)
 981			return -EINVAL;
 982#else
 983		if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 984				/ sizeof(struct rps_dev_flow)) {
 985			/* Enforce a limit to prevent overflow */
 986			return -EINVAL;
 987		}
 988#endif
 989		table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 990		if (!table)
 991			return -ENOMEM;
 992
 993		table->mask = mask;
 994		for (count = 0; count <= mask; count++)
 995			table->flows[count].cpu = RPS_NO_CPU;
 996	} else {
 997		table = NULL;
 998	}
 999
1000	spin_lock(&rps_dev_flow_lock);
1001	old_table = rcu_dereference_protected(queue->rps_flow_table,
1002					      lockdep_is_held(&rps_dev_flow_lock));
1003	rcu_assign_pointer(queue->rps_flow_table, table);
1004	spin_unlock(&rps_dev_flow_lock);
1005
1006	if (old_table)
1007		call_rcu(&old_table->rcu, rps_dev_flow_table_release);
1008
1009	return len;
1010}
1011
1012static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
1013	= __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
1014
1015static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
1016	= __ATTR(rps_flow_cnt, 0644,
1017		 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
1018#endif /* CONFIG_RPS */
1019
1020static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
1021#ifdef CONFIG_RPS
1022	&rps_cpus_attribute.attr,
1023	&rps_dev_flow_table_cnt_attribute.attr,
1024#endif
1025	NULL
1026};
1027ATTRIBUTE_GROUPS(rx_queue_default);
1028
1029static void rx_queue_release(struct kobject *kobj)
1030{
1031	struct netdev_rx_queue *queue = to_rx_queue(kobj);
1032#ifdef CONFIG_RPS
1033	struct rps_map *map;
1034	struct rps_dev_flow_table *flow_table;
1035
1036	map = rcu_dereference_protected(queue->rps_map, 1);
1037	if (map) {
1038		RCU_INIT_POINTER(queue->rps_map, NULL);
1039		kfree_rcu(map, rcu);
1040	}
1041
1042	flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
1043	if (flow_table) {
1044		RCU_INIT_POINTER(queue->rps_flow_table, NULL);
1045		call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
1046	}
1047#endif
1048
1049	memset(kobj, 0, sizeof(*kobj));
1050	netdev_put(queue->dev, &queue->dev_tracker);
1051}
1052
1053static const void *rx_queue_namespace(const struct kobject *kobj)
1054{
1055	struct netdev_rx_queue *queue = to_rx_queue(kobj);
1056	struct device *dev = &queue->dev->dev;
1057	const void *ns = NULL;
1058
1059	if (dev->class && dev->class->ns_type)
1060		ns = dev->class->namespace(dev);
1061
1062	return ns;
1063}
1064
1065static void rx_queue_get_ownership(const struct kobject *kobj,
1066				   kuid_t *uid, kgid_t *gid)
1067{
1068	const struct net *net = rx_queue_namespace(kobj);
1069
1070	net_ns_get_ownership(net, uid, gid);
1071}
1072
1073static const struct kobj_type rx_queue_ktype = {
1074	.sysfs_ops = &rx_queue_sysfs_ops,
1075	.release = rx_queue_release,
1076	.default_groups = rx_queue_default_groups,
1077	.namespace = rx_queue_namespace,
1078	.get_ownership = rx_queue_get_ownership,
1079};
1080
1081static int rx_queue_default_mask(struct net_device *dev,
1082				 struct netdev_rx_queue *queue)
1083{
1084#if IS_ENABLED(CONFIG_RPS) && IS_ENABLED(CONFIG_SYSCTL)
1085	struct cpumask *rps_default_mask = READ_ONCE(dev_net(dev)->core.rps_default_mask);
1086
1087	if (rps_default_mask && !cpumask_empty(rps_default_mask))
1088		return netdev_rx_queue_set_rps_mask(queue, rps_default_mask);
1089#endif
1090	return 0;
1091}
1092
1093static int rx_queue_add_kobject(struct net_device *dev, int index)
1094{
1095	struct netdev_rx_queue *queue = dev->_rx + index;
1096	struct kobject *kobj = &queue->kobj;
1097	int error = 0;
1098
1099	/* Kobject_put later will trigger rx_queue_release call which
1100	 * decreases dev refcount: Take that reference here
1101	 */
1102	netdev_hold(queue->dev, &queue->dev_tracker, GFP_KERNEL);
1103
1104	kobj->kset = dev->queues_kset;
1105	error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
1106				     "rx-%u", index);
1107	if (error)
1108		goto err;
1109
1110	if (dev->sysfs_rx_queue_group) {
1111		error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
1112		if (error)
1113			goto err;
 
 
1114	}
1115
1116	error = rx_queue_default_mask(dev, queue);
1117	if (error)
1118		goto err;
1119
1120	kobject_uevent(kobj, KOBJ_ADD);
1121
1122	return error;
1123
1124err:
1125	kobject_put(kobj);
1126	return error;
1127}
1128
1129static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
1130				 kgid_t kgid)
1131{
1132	struct netdev_rx_queue *queue = dev->_rx + index;
1133	struct kobject *kobj = &queue->kobj;
1134	int error;
1135
1136	error = sysfs_change_owner(kobj, kuid, kgid);
1137	if (error)
1138		return error;
1139
1140	if (dev->sysfs_rx_queue_group)
1141		error = sysfs_group_change_owner(
1142			kobj, dev->sysfs_rx_queue_group, kuid, kgid);
1143
1144	return error;
1145}
1146#endif /* CONFIG_SYSFS */
1147
1148int
1149net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1150{
1151#ifdef CONFIG_SYSFS
1152	int i;
1153	int error = 0;
1154
1155#ifndef CONFIG_RPS
1156	if (!dev->sysfs_rx_queue_group)
1157		return 0;
1158#endif
1159	for (i = old_num; i < new_num; i++) {
1160		error = rx_queue_add_kobject(dev, i);
1161		if (error) {
1162			new_num = old_num;
1163			break;
1164		}
1165	}
1166
1167	while (--i >= new_num) {
1168		struct kobject *kobj = &dev->_rx[i].kobj;
1169
1170		if (!refcount_read(&dev_net(dev)->ns.count))
1171			kobj->uevent_suppress = 1;
1172		if (dev->sysfs_rx_queue_group)
1173			sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
1174		kobject_put(kobj);
1175	}
1176
1177	return error;
1178#else
1179	return 0;
1180#endif
1181}
1182
1183static int net_rx_queue_change_owner(struct net_device *dev, int num,
1184				     kuid_t kuid, kgid_t kgid)
1185{
1186#ifdef CONFIG_SYSFS
1187	int error = 0;
1188	int i;
1189
1190#ifndef CONFIG_RPS
1191	if (!dev->sysfs_rx_queue_group)
1192		return 0;
1193#endif
1194	for (i = 0; i < num; i++) {
1195		error = rx_queue_change_owner(dev, i, kuid, kgid);
1196		if (error)
1197			break;
1198	}
1199
1200	return error;
1201#else
1202	return 0;
1203#endif
1204}
1205
1206#ifdef CONFIG_SYSFS
1207/*
1208 * netdev_queue sysfs structures and functions.
1209 */
1210struct netdev_queue_attribute {
1211	struct attribute attr;
1212	ssize_t (*show)(struct netdev_queue *queue, char *buf);
1213	ssize_t (*store)(struct netdev_queue *queue,
1214			 const char *buf, size_t len);
1215};
1216#define to_netdev_queue_attr(_attr) \
1217	container_of(_attr, struct netdev_queue_attribute, attr)
1218
1219#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1220
1221static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1222				      struct attribute *attr, char *buf)
1223{
1224	const struct netdev_queue_attribute *attribute
1225		= to_netdev_queue_attr(attr);
1226	struct netdev_queue *queue = to_netdev_queue(kobj);
1227
1228	if (!attribute->show)
1229		return -EIO;
1230
1231	return attribute->show(queue, buf);
1232}
1233
1234static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1235				       struct attribute *attr,
1236				       const char *buf, size_t count)
1237{
1238	const struct netdev_queue_attribute *attribute
1239		= to_netdev_queue_attr(attr);
1240	struct netdev_queue *queue = to_netdev_queue(kobj);
1241
1242	if (!attribute->store)
1243		return -EIO;
1244
1245	return attribute->store(queue, buf, count);
1246}
1247
1248static const struct sysfs_ops netdev_queue_sysfs_ops = {
1249	.show = netdev_queue_attr_show,
1250	.store = netdev_queue_attr_store,
1251};
1252
1253static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1254{
1255	unsigned long trans_timeout = atomic_long_read(&queue->trans_timeout);
 
 
 
 
1256
1257	return sysfs_emit(buf, fmt_ulong, trans_timeout);
1258}
1259
1260static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1261{
1262	struct net_device *dev = queue->dev;
1263	unsigned int i;
1264
1265	i = queue - dev->_tx;
1266	BUG_ON(i >= dev->num_tx_queues);
1267
1268	return i;
1269}
1270
1271static ssize_t traffic_class_show(struct netdev_queue *queue,
1272				  char *buf)
1273{
1274	struct net_device *dev = queue->dev;
1275	int num_tc, tc;
1276	int index;
1277
1278	if (!netif_is_multiqueue(dev))
1279		return -ENOENT;
1280
1281	if (!rtnl_trylock())
1282		return restart_syscall();
1283
1284	index = get_netdev_queue_index(queue);
1285
1286	/* If queue belongs to subordinate dev use its TC mapping */
1287	dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1288
1289	num_tc = dev->num_tc;
1290	tc = netdev_txq_to_tc(dev, index);
1291
1292	rtnl_unlock();
1293
1294	if (tc < 0)
1295		return -EINVAL;
1296
1297	/* We can report the traffic class one of two ways:
1298	 * Subordinate device traffic classes are reported with the traffic
1299	 * class first, and then the subordinate class so for example TC0 on
1300	 * subordinate device 2 will be reported as "0-2". If the queue
1301	 * belongs to the root device it will be reported with just the
1302	 * traffic class, so just "0" for TC 0 for example.
1303	 */
1304	return num_tc < 0 ? sysfs_emit(buf, "%d%d\n", tc, num_tc) :
1305			    sysfs_emit(buf, "%d\n", tc);
1306}
1307
1308#ifdef CONFIG_XPS
1309static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1310			       char *buf)
1311{
1312	return sysfs_emit(buf, "%lu\n", queue->tx_maxrate);
1313}
1314
1315static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1316				const char *buf, size_t len)
1317{
1318	struct net_device *dev = queue->dev;
1319	int err, index = get_netdev_queue_index(queue);
1320	u32 rate = 0;
1321
1322	if (!capable(CAP_NET_ADMIN))
1323		return -EPERM;
1324
1325	/* The check is also done later; this helps returning early without
1326	 * hitting the trylock/restart below.
1327	 */
1328	if (!dev->netdev_ops->ndo_set_tx_maxrate)
1329		return -EOPNOTSUPP;
1330
1331	err = kstrtou32(buf, 10, &rate);
1332	if (err < 0)
1333		return err;
1334
1335	if (!rtnl_trylock())
1336		return restart_syscall();
1337
1338	err = -EOPNOTSUPP;
1339	if (dev->netdev_ops->ndo_set_tx_maxrate)
1340		err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1341
1342	rtnl_unlock();
1343	if (!err) {
1344		queue->tx_maxrate = rate;
1345		return len;
1346	}
1347	return err;
1348}
1349
1350static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1351	= __ATTR_RW(tx_maxrate);
1352#endif
1353
1354static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1355	= __ATTR_RO(tx_timeout);
1356
1357static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1358	= __ATTR_RO(traffic_class);
1359
1360#ifdef CONFIG_BQL
1361/*
1362 * Byte queue limits sysfs structures and functions.
1363 */
1364static ssize_t bql_show(char *buf, unsigned int value)
1365{
1366	return sysfs_emit(buf, "%u\n", value);
1367}
1368
1369static ssize_t bql_set(const char *buf, const size_t count,
1370		       unsigned int *pvalue)
1371{
1372	unsigned int value;
1373	int err;
1374
1375	if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1376		value = DQL_MAX_LIMIT;
1377	} else {
1378		err = kstrtouint(buf, 10, &value);
1379		if (err < 0)
1380			return err;
1381		if (value > DQL_MAX_LIMIT)
1382			return -EINVAL;
1383	}
1384
1385	*pvalue = value;
1386
1387	return count;
1388}
1389
1390static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1391				  char *buf)
1392{
1393	struct dql *dql = &queue->dql;
1394
1395	return sysfs_emit(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1396}
1397
1398static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1399				 const char *buf, size_t len)
1400{
1401	struct dql *dql = &queue->dql;
1402	unsigned int value;
1403	int err;
1404
1405	err = kstrtouint(buf, 10, &value);
1406	if (err < 0)
1407		return err;
1408
1409	dql->slack_hold_time = msecs_to_jiffies(value);
1410
1411	return len;
1412}
1413
1414static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1415	= __ATTR(hold_time, 0644,
1416		 bql_show_hold_time, bql_set_hold_time);
1417
1418static ssize_t bql_show_stall_thrs(struct netdev_queue *queue, char *buf)
1419{
1420	struct dql *dql = &queue->dql;
1421
1422	return sprintf(buf, "%u\n", jiffies_to_msecs(dql->stall_thrs));
1423}
1424
1425static ssize_t bql_set_stall_thrs(struct netdev_queue *queue,
1426				  const char *buf, size_t len)
1427{
1428	struct dql *dql = &queue->dql;
1429	unsigned int value;
1430	int err;
1431
1432	err = kstrtouint(buf, 10, &value);
1433	if (err < 0)
1434		return err;
1435
1436	value = msecs_to_jiffies(value);
1437	if (value && (value < 4 || value > 4 / 2 * BITS_PER_LONG))
1438		return -ERANGE;
1439
1440	if (!dql->stall_thrs && value)
1441		dql->last_reap = jiffies;
1442	/* Force last_reap to be live */
1443	smp_wmb();
1444	dql->stall_thrs = value;
1445
1446	return len;
1447}
1448
1449static struct netdev_queue_attribute bql_stall_thrs_attribute __ro_after_init =
1450	__ATTR(stall_thrs, 0644, bql_show_stall_thrs, bql_set_stall_thrs);
1451
1452static ssize_t bql_show_stall_max(struct netdev_queue *queue, char *buf)
1453{
1454	return sprintf(buf, "%u\n", READ_ONCE(queue->dql.stall_max));
1455}
1456
1457static ssize_t bql_set_stall_max(struct netdev_queue *queue,
1458				 const char *buf, size_t len)
1459{
1460	WRITE_ONCE(queue->dql.stall_max, 0);
1461	return len;
1462}
1463
1464static struct netdev_queue_attribute bql_stall_max_attribute __ro_after_init =
1465	__ATTR(stall_max, 0644, bql_show_stall_max, bql_set_stall_max);
1466
1467static ssize_t bql_show_stall_cnt(struct netdev_queue *queue, char *buf)
1468{
1469	struct dql *dql = &queue->dql;
1470
1471	return sprintf(buf, "%lu\n", dql->stall_cnt);
1472}
1473
1474static struct netdev_queue_attribute bql_stall_cnt_attribute __ro_after_init =
1475	__ATTR(stall_cnt, 0444, bql_show_stall_cnt, NULL);
1476
1477static ssize_t bql_show_inflight(struct netdev_queue *queue,
1478				 char *buf)
1479{
1480	struct dql *dql = &queue->dql;
1481
1482	return sysfs_emit(buf, "%u\n", dql->num_queued - dql->num_completed);
1483}
1484
1485static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1486	__ATTR(inflight, 0444, bql_show_inflight, NULL);
1487
1488#define BQL_ATTR(NAME, FIELD)						\
1489static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,		\
1490				 char *buf)				\
1491{									\
1492	return bql_show(buf, queue->dql.FIELD);				\
1493}									\
1494									\
1495static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,		\
1496				const char *buf, size_t len)		\
1497{									\
1498	return bql_set(buf, len, &queue->dql.FIELD);			\
1499}									\
1500									\
1501static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1502	= __ATTR(NAME, 0644,				\
1503		 bql_show_ ## NAME, bql_set_ ## NAME)
1504
1505BQL_ATTR(limit, limit);
1506BQL_ATTR(limit_max, max_limit);
1507BQL_ATTR(limit_min, min_limit);
1508
1509static struct attribute *dql_attrs[] __ro_after_init = {
1510	&bql_limit_attribute.attr,
1511	&bql_limit_max_attribute.attr,
1512	&bql_limit_min_attribute.attr,
1513	&bql_hold_time_attribute.attr,
1514	&bql_inflight_attribute.attr,
1515	&bql_stall_thrs_attribute.attr,
1516	&bql_stall_cnt_attribute.attr,
1517	&bql_stall_max_attribute.attr,
1518	NULL
1519};
1520
1521static const struct attribute_group dql_group = {
1522	.name  = "byte_queue_limits",
1523	.attrs  = dql_attrs,
1524};
1525#else
1526/* Fake declaration, all the code using it should be dead */
1527extern const struct attribute_group dql_group;
1528#endif /* CONFIG_BQL */
1529
1530#ifdef CONFIG_XPS
1531static ssize_t xps_queue_show(struct net_device *dev, unsigned int index,
1532			      int tc, char *buf, enum xps_map_type type)
1533{
 
 
1534	struct xps_dev_maps *dev_maps;
1535	unsigned long *mask;
1536	unsigned int nr_ids;
1537	int j, len;
1538
1539	rcu_read_lock();
1540	dev_maps = rcu_dereference(dev->xps_maps[type]);
1541
1542	/* Default to nr_cpu_ids/dev->num_rx_queues and do not just return 0
1543	 * when dev_maps hasn't been allocated yet, to be backward compatible.
1544	 */
1545	nr_ids = dev_maps ? dev_maps->nr_ids :
1546		 (type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues);
1547
1548	mask = bitmap_zalloc(nr_ids, GFP_NOWAIT);
1549	if (!mask) {
1550		rcu_read_unlock();
1551		return -ENOMEM;
 
1552	}
1553
1554	if (!dev_maps || tc >= dev_maps->num_tc)
1555		goto out_no_maps;
1556
1557	for (j = 0; j < nr_ids; j++) {
1558		int i, tci = j * dev_maps->num_tc + tc;
1559		struct xps_map *map;
1560
1561		map = rcu_dereference(dev_maps->attr_map[tci]);
1562		if (!map)
1563			continue;
1564
1565		for (i = map->len; i--;) {
1566			if (map->queues[i] == index) {
1567				__set_bit(j, mask);
1568				break;
 
 
 
 
1569			}
1570		}
1571	}
1572out_no_maps:
1573	rcu_read_unlock();
1574
1575	len = bitmap_print_to_pagebuf(false, buf, mask, nr_ids);
1576	bitmap_free(mask);
1577
1578	return len < PAGE_SIZE ? len : -EINVAL;
1579}
1580
1581static ssize_t xps_cpus_show(struct netdev_queue *queue, char *buf)
1582{
1583	struct net_device *dev = queue->dev;
1584	unsigned int index;
1585	int len, tc;
1586
1587	if (!netif_is_multiqueue(dev))
1588		return -ENOENT;
1589
1590	index = get_netdev_queue_index(queue);
1591
1592	if (!rtnl_trylock())
1593		return restart_syscall();
1594
1595	/* If queue belongs to subordinate dev use its map */
1596	dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1597
1598	tc = netdev_txq_to_tc(dev, index);
1599	if (tc < 0) {
1600		rtnl_unlock();
1601		return -EINVAL;
1602	}
1603
1604	/* Make sure the subordinate device can't be freed */
1605	get_device(&dev->dev);
1606	rtnl_unlock();
1607
1608	len = xps_queue_show(dev, index, tc, buf, XPS_CPUS);
1609
1610	put_device(&dev->dev);
1611	return len;
1612}
1613
1614static ssize_t xps_cpus_store(struct netdev_queue *queue,
1615			      const char *buf, size_t len)
1616{
1617	struct net_device *dev = queue->dev;
1618	unsigned int index;
1619	cpumask_var_t mask;
1620	int err;
1621
1622	if (!netif_is_multiqueue(dev))
1623		return -ENOENT;
1624
1625	if (!capable(CAP_NET_ADMIN))
1626		return -EPERM;
1627
1628	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1629		return -ENOMEM;
1630
1631	index = get_netdev_queue_index(queue);
1632
1633	err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1634	if (err) {
1635		free_cpumask_var(mask);
1636		return err;
1637	}
1638
1639	if (!rtnl_trylock()) {
1640		free_cpumask_var(mask);
1641		return restart_syscall();
1642	}
1643
1644	err = netif_set_xps_queue(dev, mask, index);
1645	rtnl_unlock();
1646
1647	free_cpumask_var(mask);
1648
1649	return err ? : len;
1650}
1651
1652static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1653	= __ATTR_RW(xps_cpus);
1654
1655static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1656{
1657	struct net_device *dev = queue->dev;
1658	unsigned int index;
1659	int tc;
1660
1661	index = get_netdev_queue_index(queue);
1662
1663	if (!rtnl_trylock())
1664		return restart_syscall();
1665
1666	tc = netdev_txq_to_tc(dev, index);
1667	rtnl_unlock();
1668	if (tc < 0)
1669		return -EINVAL;
1670
1671	return xps_queue_show(dev, index, tc, buf, XPS_RXQS);
1672}
1673
1674static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1675			      size_t len)
1676{
1677	struct net_device *dev = queue->dev;
1678	struct net *net = dev_net(dev);
1679	unsigned long *mask;
1680	unsigned int index;
1681	int err;
1682
1683	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1684		return -EPERM;
1685
1686	mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1687	if (!mask)
1688		return -ENOMEM;
1689
1690	index = get_netdev_queue_index(queue);
1691
1692	err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1693	if (err) {
1694		bitmap_free(mask);
1695		return err;
1696	}
1697
1698	if (!rtnl_trylock()) {
1699		bitmap_free(mask);
1700		return restart_syscall();
1701	}
1702
1703	cpus_read_lock();
1704	err = __netif_set_xps_queue(dev, mask, index, XPS_RXQS);
1705	cpus_read_unlock();
1706
1707	rtnl_unlock();
1708
1709	bitmap_free(mask);
1710	return err ? : len;
1711}
1712
1713static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1714	= __ATTR_RW(xps_rxqs);
1715#endif /* CONFIG_XPS */
1716
1717static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1718	&queue_trans_timeout.attr,
1719	&queue_traffic_class.attr,
1720#ifdef CONFIG_XPS
1721	&xps_cpus_attribute.attr,
1722	&xps_rxqs_attribute.attr,
1723	&queue_tx_maxrate.attr,
1724#endif
1725	NULL
1726};
1727ATTRIBUTE_GROUPS(netdev_queue_default);
1728
1729static void netdev_queue_release(struct kobject *kobj)
1730{
1731	struct netdev_queue *queue = to_netdev_queue(kobj);
1732
1733	memset(kobj, 0, sizeof(*kobj));
1734	netdev_put(queue->dev, &queue->dev_tracker);
1735}
1736
1737static const void *netdev_queue_namespace(const struct kobject *kobj)
1738{
1739	struct netdev_queue *queue = to_netdev_queue(kobj);
1740	struct device *dev = &queue->dev->dev;
1741	const void *ns = NULL;
1742
1743	if (dev->class && dev->class->ns_type)
1744		ns = dev->class->namespace(dev);
1745
1746	return ns;
1747}
1748
1749static void netdev_queue_get_ownership(const struct kobject *kobj,
1750				       kuid_t *uid, kgid_t *gid)
1751{
1752	const struct net *net = netdev_queue_namespace(kobj);
1753
1754	net_ns_get_ownership(net, uid, gid);
1755}
1756
1757static const struct kobj_type netdev_queue_ktype = {
1758	.sysfs_ops = &netdev_queue_sysfs_ops,
1759	.release = netdev_queue_release,
1760	.default_groups = netdev_queue_default_groups,
1761	.namespace = netdev_queue_namespace,
1762	.get_ownership = netdev_queue_get_ownership,
1763};
1764
1765static bool netdev_uses_bql(const struct net_device *dev)
1766{
1767	if (dev->features & NETIF_F_LLTX ||
1768	    dev->priv_flags & IFF_NO_QUEUE)
1769		return false;
1770
1771	return IS_ENABLED(CONFIG_BQL);
1772}
1773
1774static int netdev_queue_add_kobject(struct net_device *dev, int index)
1775{
1776	struct netdev_queue *queue = dev->_tx + index;
1777	struct kobject *kobj = &queue->kobj;
1778	int error = 0;
1779
1780	/* Kobject_put later will trigger netdev_queue_release call
1781	 * which decreases dev refcount: Take that reference here
1782	 */
1783	netdev_hold(queue->dev, &queue->dev_tracker, GFP_KERNEL);
1784
1785	kobj->kset = dev->queues_kset;
1786	error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1787				     "tx-%u", index);
1788	if (error)
1789		goto err;
1790
1791	if (netdev_uses_bql(dev)) {
1792		error = sysfs_create_group(kobj, &dql_group);
1793		if (error)
1794			goto err;
 
1795	}
 
1796
1797	kobject_uevent(kobj, KOBJ_ADD);
1798	return 0;
1799
1800err:
1801	kobject_put(kobj);
1802	return error;
1803}
1804
1805static int tx_queue_change_owner(struct net_device *ndev, int index,
1806				 kuid_t kuid, kgid_t kgid)
1807{
1808	struct netdev_queue *queue = ndev->_tx + index;
1809	struct kobject *kobj = &queue->kobj;
1810	int error;
1811
1812	error = sysfs_change_owner(kobj, kuid, kgid);
1813	if (error)
1814		return error;
1815
1816	if (netdev_uses_bql(ndev))
1817		error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
1818
1819	return error;
1820}
1821#endif /* CONFIG_SYSFS */
1822
1823int
1824netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1825{
1826#ifdef CONFIG_SYSFS
1827	int i;
1828	int error = 0;
1829
1830	/* Tx queue kobjects are allowed to be updated when a device is being
1831	 * unregistered, but solely to remove queues from qdiscs. Any path
1832	 * adding queues should be fixed.
1833	 */
1834	WARN(dev->reg_state == NETREG_UNREGISTERING && new_num > old_num,
1835	     "New queues can't be registered after device unregistration.");
1836
1837	for (i = old_num; i < new_num; i++) {
1838		error = netdev_queue_add_kobject(dev, i);
1839		if (error) {
1840			new_num = old_num;
1841			break;
1842		}
1843	}
1844
1845	while (--i >= new_num) {
1846		struct netdev_queue *queue = dev->_tx + i;
1847
1848		if (!refcount_read(&dev_net(dev)->ns.count))
1849			queue->kobj.uevent_suppress = 1;
1850
1851		if (netdev_uses_bql(dev))
1852			sysfs_remove_group(&queue->kobj, &dql_group);
1853
1854		kobject_put(&queue->kobj);
1855	}
1856
1857	return error;
1858#else
1859	return 0;
1860#endif /* CONFIG_SYSFS */
1861}
1862
1863static int net_tx_queue_change_owner(struct net_device *dev, int num,
1864				     kuid_t kuid, kgid_t kgid)
1865{
1866#ifdef CONFIG_SYSFS
1867	int error = 0;
1868	int i;
1869
1870	for (i = 0; i < num; i++) {
1871		error = tx_queue_change_owner(dev, i, kuid, kgid);
1872		if (error)
1873			break;
1874	}
1875
1876	return error;
1877#else
1878	return 0;
1879#endif /* CONFIG_SYSFS */
1880}
1881
1882static int register_queue_kobjects(struct net_device *dev)
1883{
1884	int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1885
1886#ifdef CONFIG_SYSFS
1887	dev->queues_kset = kset_create_and_add("queues",
1888					       NULL, &dev->dev.kobj);
1889	if (!dev->queues_kset)
1890		return -ENOMEM;
1891	real_rx = dev->real_num_rx_queues;
1892#endif
1893	real_tx = dev->real_num_tx_queues;
1894
1895	error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1896	if (error)
1897		goto error;
1898	rxq = real_rx;
1899
1900	error = netdev_queue_update_kobjects(dev, 0, real_tx);
1901	if (error)
1902		goto error;
1903	txq = real_tx;
1904
1905	return 0;
1906
1907error:
1908	netdev_queue_update_kobjects(dev, txq, 0);
1909	net_rx_queue_update_kobjects(dev, rxq, 0);
1910#ifdef CONFIG_SYSFS
1911	kset_unregister(dev->queues_kset);
1912#endif
1913	return error;
1914}
1915
1916static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
1917{
1918	int error = 0, real_rx = 0, real_tx = 0;
1919
1920#ifdef CONFIG_SYSFS
1921	if (ndev->queues_kset) {
1922		error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
1923		if (error)
1924			return error;
1925	}
1926	real_rx = ndev->real_num_rx_queues;
1927#endif
1928	real_tx = ndev->real_num_tx_queues;
1929
1930	error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
1931	if (error)
1932		return error;
1933
1934	error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
1935	if (error)
1936		return error;
1937
1938	return 0;
1939}
1940
1941static void remove_queue_kobjects(struct net_device *dev)
1942{
1943	int real_rx = 0, real_tx = 0;
1944
1945#ifdef CONFIG_SYSFS
1946	real_rx = dev->real_num_rx_queues;
1947#endif
1948	real_tx = dev->real_num_tx_queues;
1949
1950	net_rx_queue_update_kobjects(dev, real_rx, 0);
1951	netdev_queue_update_kobjects(dev, real_tx, 0);
1952
1953	dev->real_num_rx_queues = 0;
1954	dev->real_num_tx_queues = 0;
1955#ifdef CONFIG_SYSFS
1956	kset_unregister(dev->queues_kset);
1957#endif
1958}
1959
1960static bool net_current_may_mount(void)
1961{
1962	struct net *net = current->nsproxy->net_ns;
1963
1964	return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1965}
1966
1967static void *net_grab_current_ns(void)
1968{
1969	struct net *ns = current->nsproxy->net_ns;
1970#ifdef CONFIG_NET_NS
1971	if (ns)
1972		refcount_inc(&ns->passive);
1973#endif
1974	return ns;
1975}
1976
1977static const void *net_initial_ns(void)
1978{
1979	return &init_net;
1980}
1981
1982static const void *net_netlink_ns(struct sock *sk)
1983{
1984	return sock_net(sk);
1985}
1986
1987const struct kobj_ns_type_operations net_ns_type_operations = {
1988	.type = KOBJ_NS_TYPE_NET,
1989	.current_may_mount = net_current_may_mount,
1990	.grab_current_ns = net_grab_current_ns,
1991	.netlink_ns = net_netlink_ns,
1992	.initial_ns = net_initial_ns,
1993	.drop_ns = net_drop_ns,
1994};
1995EXPORT_SYMBOL_GPL(net_ns_type_operations);
1996
1997static int netdev_uevent(const struct device *d, struct kobj_uevent_env *env)
1998{
1999	const struct net_device *dev = to_net_dev(d);
2000	int retval;
2001
2002	/* pass interface to uevent. */
2003	retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
2004	if (retval)
2005		goto exit;
2006
2007	/* pass ifindex to uevent.
2008	 * ifindex is useful as it won't change (interface name may change)
2009	 * and is what RtNetlink uses natively.
2010	 */
2011	retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
2012
2013exit:
2014	return retval;
2015}
2016
2017/*
2018 *	netdev_release -- destroy and free a dead device.
2019 *	Called when last reference to device kobject is gone.
2020 */
2021static void netdev_release(struct device *d)
2022{
2023	struct net_device *dev = to_net_dev(d);
2024
2025	BUG_ON(dev->reg_state != NETREG_RELEASED);
2026
2027	/* no need to wait for rcu grace period:
2028	 * device is dead and about to be freed.
2029	 */
2030	kfree(rcu_access_pointer(dev->ifalias));
2031	netdev_freemem(dev);
2032}
2033
2034static const void *net_namespace(const struct device *d)
2035{
2036	const struct net_device *dev = to_net_dev(d);
2037
2038	return dev_net(dev);
2039}
2040
2041static void net_get_ownership(const struct device *d, kuid_t *uid, kgid_t *gid)
2042{
2043	const struct net_device *dev = to_net_dev(d);
2044	const struct net *net = dev_net(dev);
2045
2046	net_ns_get_ownership(net, uid, gid);
2047}
2048
2049static struct class net_class __ro_after_init = {
2050	.name = "net",
2051	.dev_release = netdev_release,
2052	.dev_groups = net_class_groups,
2053	.dev_uevent = netdev_uevent,
2054	.ns_type = &net_ns_type_operations,
2055	.namespace = net_namespace,
2056	.get_ownership = net_get_ownership,
2057};
2058
2059#ifdef CONFIG_OF
2060static int of_dev_node_match(struct device *dev, const void *data)
2061{
2062	for (; dev; dev = dev->parent) {
2063		if (dev->of_node == data)
2064			return 1;
2065	}
2066
2067	return 0;
 
 
 
2068}
2069
2070/*
2071 * of_find_net_device_by_node - lookup the net device for the device node
2072 * @np: OF device node
2073 *
2074 * Looks up the net_device structure corresponding with the device node.
2075 * If successful, returns a pointer to the net_device with the embedded
2076 * struct device refcount incremented by one, or NULL on failure. The
2077 * refcount must be dropped when done with the net_device.
2078 */
2079struct net_device *of_find_net_device_by_node(struct device_node *np)
2080{
2081	struct device *dev;
2082
2083	dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
2084	if (!dev)
2085		return NULL;
2086
2087	return to_net_dev(dev);
2088}
2089EXPORT_SYMBOL(of_find_net_device_by_node);
2090#endif
2091
2092/* Delete sysfs entries but hold kobject reference until after all
2093 * netdev references are gone.
2094 */
2095void netdev_unregister_kobject(struct net_device *ndev)
2096{
2097	struct device *dev = &ndev->dev;
2098
2099	if (!refcount_read(&dev_net(ndev)->ns.count))
2100		dev_set_uevent_suppress(dev, 1);
2101
2102	kobject_get(&dev->kobj);
2103
2104	remove_queue_kobjects(ndev);
2105
2106	pm_runtime_set_memalloc_noio(dev, false);
2107
2108	device_del(dev);
2109}
2110
2111/* Create sysfs entries for network device. */
2112int netdev_register_kobject(struct net_device *ndev)
2113{
2114	struct device *dev = &ndev->dev;
2115	const struct attribute_group **groups = ndev->sysfs_groups;
2116	int error = 0;
2117
2118	device_initialize(dev);
2119	dev->class = &net_class;
2120	dev->platform_data = ndev;
2121	dev->groups = groups;
2122
2123	dev_set_name(dev, "%s", ndev->name);
2124
2125#ifdef CONFIG_SYSFS
2126	/* Allow for a device specific group */
2127	if (*groups)
2128		groups++;
2129
2130	*groups++ = &netstat_group;
2131
2132	if (wireless_group_needed(ndev))
 
 
 
 
2133		*groups++ = &wireless_group;
 
 
2134#endif /* CONFIG_SYSFS */
2135
2136	error = device_add(dev);
2137	if (error)
2138		return error;
2139
2140	error = register_queue_kobjects(ndev);
2141	if (error) {
2142		device_del(dev);
2143		return error;
2144	}
2145
2146	pm_runtime_set_memalloc_noio(dev, true);
2147
2148	return error;
2149}
2150
2151/* Change owner for sysfs entries when moving network devices across network
2152 * namespaces owned by different user namespaces.
2153 */
2154int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
2155			const struct net *net_new)
2156{
2157	kuid_t old_uid = GLOBAL_ROOT_UID, new_uid = GLOBAL_ROOT_UID;
2158	kgid_t old_gid = GLOBAL_ROOT_GID, new_gid = GLOBAL_ROOT_GID;
2159	struct device *dev = &ndev->dev;
2160	int error;
2161
2162	net_ns_get_ownership(net_old, &old_uid, &old_gid);
2163	net_ns_get_ownership(net_new, &new_uid, &new_gid);
2164
2165	/* The network namespace was changed but the owning user namespace is
2166	 * identical so there's no need to change the owner of sysfs entries.
2167	 */
2168	if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid))
2169		return 0;
2170
2171	error = device_change_owner(dev, new_uid, new_gid);
2172	if (error)
2173		return error;
2174
2175	error = queue_change_owner(ndev, new_uid, new_gid);
2176	if (error)
2177		return error;
2178
2179	return 0;
2180}
2181
2182int netdev_class_create_file_ns(const struct class_attribute *class_attr,
2183				const void *ns)
2184{
2185	return class_create_file_ns(&net_class, class_attr, ns);
2186}
2187EXPORT_SYMBOL(netdev_class_create_file_ns);
2188
2189void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
2190				 const void *ns)
2191{
2192	class_remove_file_ns(&net_class, class_attr, ns);
2193}
2194EXPORT_SYMBOL(netdev_class_remove_file_ns);
2195
2196int __init netdev_kobject_init(void)
2197{
2198	kobj_ns_type_register(&net_ns_type_operations);
2199	return class_register(&net_class);
2200}