1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * INET		An implementation of the TCP/IP protocol suite for the LINUX
4  *		operating system.  INET is implemented using the  BSD Socket
5  *		interface as the means of communication with the user level.
6  *
7  *		Definitions for the Interfaces handler.
8  *
9  * Version:	@(#)dev.h	1.0.10	08/12/93
10  *
11  * Authors:	Ross Biro
12  *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
13  *		Corey Minyard <wf-rch!minyard@relay.EU.net>
14  *		Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
15  *		Alan Cox, <alan@lxorguk.ukuu.org.uk>
16  *		Bjorn Ekwall. <bj0rn@blox.se>
17  *              Pekka Riikonen <priikone@poseidon.pspt.fi>
18  *
19  *		Moved to /usr/include/linux for NET3
20  */
21 #ifndef _LINUX_NETDEVICE_H
22 #define _LINUX_NETDEVICE_H
23 
24 #include <linux/timer.h>
25 #include <linux/bug.h>
26 #include <linux/delay.h>
27 #include <linux/atomic.h>
28 #include <linux/prefetch.h>
29 #include <asm/cache.h>
30 #include <asm/byteorder.h>
31 #include <asm/local.h>
32 
33 #include <linux/percpu.h>
34 #include <linux/rculist.h>
35 #include <linux/workqueue.h>
36 #include <linux/dynamic_queue_limits.h>
37 
38 #include <net/net_namespace.h>
39 #ifdef CONFIG_DCB
40 #include <net/dcbnl.h>
41 #endif
42 #include <net/netprio_cgroup.h>
43 
44 #include <linux/netdev_features.h>
45 #include <linux/neighbour.h>
46 #include <uapi/linux/netdevice.h>
47 #include <uapi/linux/if_bonding.h>
48 #include <uapi/linux/pkt_cls.h>
49 #include <uapi/linux/netdev.h>
50 #include <linux/hashtable.h>
51 #include <linux/rbtree.h>
52 #include <net/net_trackers.h>
53 #include <net/net_debug.h>
54 #include <net/dropreason-core.h>
55 
56 struct netpoll_info;
57 struct device;
58 struct ethtool_ops;
59 struct kernel_hwtstamp_config;
60 struct phy_device;
61 struct dsa_port;
62 struct ip_tunnel_parm;
63 struct macsec_context;
64 struct macsec_ops;
65 struct netdev_name_node;
66 struct sd_flow_limit;
67 struct sfp_bus;
68 /* 802.11 specific */
69 struct wireless_dev;
70 /* 802.15.4 specific */
71 struct wpan_dev;
72 struct mpls_dev;
73 /* UDP Tunnel offloads */
74 struct udp_tunnel_info;
75 struct udp_tunnel_nic_info;
76 struct udp_tunnel_nic;
77 struct bpf_prog;
78 struct xdp_buff;
79 struct xdp_frame;
80 struct xdp_metadata_ops;
81 struct xdp_md;
82 
83 typedef u32 xdp_features_t;
84 
85 void synchronize_net(void);
86 void netdev_set_default_ethtool_ops(struct net_device *dev,
87 				    const struct ethtool_ops *ops);
88 void netdev_sw_irq_coalesce_default_on(struct net_device *dev);
89 
90 /* Backlog congestion levels */
91 #define NET_RX_SUCCESS		0	/* keep 'em coming, baby */
92 #define NET_RX_DROP		1	/* packet dropped */
93 
94 #define MAX_NEST_DEV 8
95 
96 /*
97  * Transmit return codes: transmit return codes originate from three different
98  * namespaces:
99  *
100  * - qdisc return codes
101  * - driver transmit return codes
102  * - errno values
103  *
104  * Drivers are allowed to return any one of those in their hard_start_xmit()
105  * function. Real network devices commonly used with qdiscs should only return
106  * the driver transmit return codes though - when qdiscs are used, the actual
107  * transmission happens asynchronously, so the value is not propagated to
108  * higher layers. Virtual network devices transmit synchronously; in this case
109  * the driver transmit return codes are consumed by dev_queue_xmit(), and all
110  * others are propagated to higher layers.
111  */
112 
113 /* qdisc ->enqueue() return codes. */
114 #define NET_XMIT_SUCCESS	0x00
115 #define NET_XMIT_DROP		0x01	/* skb dropped			*/
116 #define NET_XMIT_CN		0x02	/* congestion notification	*/
117 #define NET_XMIT_MASK		0x0f	/* qdisc flags in net/sch_generic.h */
118 
119 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
120  * indicates that the device will soon be dropping packets, or already drops
121  * some packets of the same priority; prompting us to send less aggressively. */
122 #define net_xmit_eval(e)	((e) == NET_XMIT_CN ? 0 : (e))
123 #define net_xmit_errno(e)	((e) != NET_XMIT_CN ? -ENOBUFS : 0)
124 
125 /* Driver transmit return codes */
126 #define NETDEV_TX_MASK		0xf0
127 
128 enum netdev_tx {
129 	__NETDEV_TX_MIN	 = INT_MIN,	/* make sure enum is signed */
130 	NETDEV_TX_OK	 = 0x00,	/* driver took care of packet */
131 	NETDEV_TX_BUSY	 = 0x10,	/* driver tx path was busy*/
132 };
133 typedef enum netdev_tx netdev_tx_t;
134 
135 /*
136  * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
137  * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
138  */
dev_xmit_complete(int rc)139 static inline bool dev_xmit_complete(int rc)
140 {
141 	/*
142 	 * Positive cases with an skb consumed by a driver:
143 	 * - successful transmission (rc == NETDEV_TX_OK)
144 	 * - error while transmitting (rc < 0)
145 	 * - error while queueing to a different device (rc & NET_XMIT_MASK)
146 	 */
147 	if (likely(rc < NET_XMIT_MASK))
148 		return true;
149 
150 	return false;
151 }
152 
153 /*
154  *	Compute the worst-case header length according to the protocols
155  *	used.
156  */
157 
158 #if defined(CONFIG_HYPERV_NET)
159 # define LL_MAX_HEADER 128
160 #elif defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
161 # if defined(CONFIG_MAC80211_MESH)
162 #  define LL_MAX_HEADER 128
163 # else
164 #  define LL_MAX_HEADER 96
165 # endif
166 #else
167 # define LL_MAX_HEADER 32
168 #endif
169 
170 #if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \
171     !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL)
172 #define MAX_HEADER LL_MAX_HEADER
173 #else
174 #define MAX_HEADER (LL_MAX_HEADER + 48)
175 #endif
176 
177 /*
178  *	Old network device statistics. Fields are native words
179  *	(unsigned long) so they can be read and written atomically.
180  */
181 
182 #define NET_DEV_STAT(FIELD)			\
183 	union {					\
184 		unsigned long FIELD;		\
185 		atomic_long_t __##FIELD;	\
186 	}
187 
188 struct net_device_stats {
189 	NET_DEV_STAT(rx_packets);
190 	NET_DEV_STAT(tx_packets);
191 	NET_DEV_STAT(rx_bytes);
192 	NET_DEV_STAT(tx_bytes);
193 	NET_DEV_STAT(rx_errors);
194 	NET_DEV_STAT(tx_errors);
195 	NET_DEV_STAT(rx_dropped);
196 	NET_DEV_STAT(tx_dropped);
197 	NET_DEV_STAT(multicast);
198 	NET_DEV_STAT(collisions);
199 	NET_DEV_STAT(rx_length_errors);
200 	NET_DEV_STAT(rx_over_errors);
201 	NET_DEV_STAT(rx_crc_errors);
202 	NET_DEV_STAT(rx_frame_errors);
203 	NET_DEV_STAT(rx_fifo_errors);
204 	NET_DEV_STAT(rx_missed_errors);
205 	NET_DEV_STAT(tx_aborted_errors);
206 	NET_DEV_STAT(tx_carrier_errors);
207 	NET_DEV_STAT(tx_fifo_errors);
208 	NET_DEV_STAT(tx_heartbeat_errors);
209 	NET_DEV_STAT(tx_window_errors);
210 	NET_DEV_STAT(rx_compressed);
211 	NET_DEV_STAT(tx_compressed);
212 };
213 #undef NET_DEV_STAT
214 
215 /* per-cpu stats, allocated on demand.
216  * Try to fit them in a single cache line, for dev_get_stats() sake.
217  */
218 struct net_device_core_stats {
219 	unsigned long	rx_dropped;
220 	unsigned long	tx_dropped;
221 	unsigned long	rx_nohandler;
222 	unsigned long	rx_otherhost_dropped;
223 } __aligned(4 * sizeof(unsigned long));
224 
225 #include <linux/cache.h>
226 #include <linux/skbuff.h>
227 
228 #ifdef CONFIG_RPS
229 #include <linux/static_key.h>
230 extern struct static_key_false rps_needed;
231 extern struct static_key_false rfs_needed;
232 #endif
233 
234 struct neighbour;
235 struct neigh_parms;
236 struct sk_buff;
237 
238 struct netdev_hw_addr {
239 	struct list_head	list;
240 	struct rb_node		node;
241 	unsigned char		addr[MAX_ADDR_LEN];
242 	unsigned char		type;
243 #define NETDEV_HW_ADDR_T_LAN		1
244 #define NETDEV_HW_ADDR_T_SAN		2
245 #define NETDEV_HW_ADDR_T_UNICAST	3
246 #define NETDEV_HW_ADDR_T_MULTICAST	4
247 	bool			global_use;
248 	int			sync_cnt;
249 	int			refcount;
250 	int			synced;
251 	struct rcu_head		rcu_head;
252 };
253 
254 struct netdev_hw_addr_list {
255 	struct list_head	list;
256 	int			count;
257 
258 	/* Auxiliary tree for faster lookup on addition and deletion */
259 	struct rb_root		tree;
260 };
261 
262 #define netdev_hw_addr_list_count(l) ((l)->count)
263 #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
264 #define netdev_hw_addr_list_for_each(ha, l) \
265 	list_for_each_entry(ha, &(l)->list, list)
266 
267 #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
268 #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
269 #define netdev_for_each_uc_addr(ha, dev) \
270 	netdev_hw_addr_list_for_each(ha, &(dev)->uc)
271 #define netdev_for_each_synced_uc_addr(_ha, _dev) \
272 	netdev_for_each_uc_addr((_ha), (_dev)) \
273 		if ((_ha)->sync_cnt)
274 
275 #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
276 #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
277 #define netdev_for_each_mc_addr(ha, dev) \
278 	netdev_hw_addr_list_for_each(ha, &(dev)->mc)
279 #define netdev_for_each_synced_mc_addr(_ha, _dev) \
280 	netdev_for_each_mc_addr((_ha), (_dev)) \
281 		if ((_ha)->sync_cnt)
282 
283 struct hh_cache {
284 	unsigned int	hh_len;
285 	seqlock_t	hh_lock;
286 
287 	/* cached hardware header; allow for machine alignment needs.        */
288 #define HH_DATA_MOD	16
289 #define HH_DATA_OFF(__len) \
290 	(HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
291 #define HH_DATA_ALIGN(__len) \
292 	(((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
293 	unsigned long	hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
294 };
295 
296 /* Reserve HH_DATA_MOD byte-aligned hard_header_len, but at least that much.
297  * Alternative is:
298  *   dev->hard_header_len ? (dev->hard_header_len +
299  *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
300  *
301  * We could use other alignment values, but we must maintain the
302  * relationship HH alignment <= LL alignment.
303  */
304 #define LL_RESERVED_SPACE(dev) \
305 	((((dev)->hard_header_len + READ_ONCE((dev)->needed_headroom)) \
306 	  & ~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
307 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
308 	((((dev)->hard_header_len + READ_ONCE((dev)->needed_headroom) + (extra)) \
309 	  & ~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
310 
311 struct header_ops {
312 	int	(*create) (struct sk_buff *skb, struct net_device *dev,
313 			   unsigned short type, const void *daddr,
314 			   const void *saddr, unsigned int len);
315 	int	(*parse)(const struct sk_buff *skb, unsigned char *haddr);
316 	int	(*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type);
317 	void	(*cache_update)(struct hh_cache *hh,
318 				const struct net_device *dev,
319 				const unsigned char *haddr);
320 	bool	(*validate)(const char *ll_header, unsigned int len);
321 	__be16	(*parse_protocol)(const struct sk_buff *skb);
322 };
323 
324 /* These flag bits are private to the generic network queueing
325  * layer; they may not be explicitly referenced by any other
326  * code.
327  */
328 
329 enum netdev_state_t {
330 	__LINK_STATE_START,
331 	__LINK_STATE_PRESENT,
332 	__LINK_STATE_NOCARRIER,
333 	__LINK_STATE_LINKWATCH_PENDING,
334 	__LINK_STATE_DORMANT,
335 	__LINK_STATE_TESTING,
336 };
337 
338 struct gro_list {
339 	struct list_head	list;
340 	int			count;
341 };
342 
343 /*
344  * size of gro hash buckets, must less than bit number of
345  * napi_struct::gro_bitmask
346  */
347 #define GRO_HASH_BUCKETS	8
348 
349 /*
350  * Structure for NAPI scheduling similar to tasklet but with weighting
351  */
352 struct napi_struct {
353 	/* The poll_list must only be managed by the entity which
354 	 * changes the state of the NAPI_STATE_SCHED bit.  This means
355 	 * whoever atomically sets that bit can add this napi_struct
356 	 * to the per-CPU poll_list, and whoever clears that bit
357 	 * can remove from the list right before clearing the bit.
358 	 */
359 	struct list_head	poll_list;
360 
361 	unsigned long		state;
362 	int			weight;
363 	int			defer_hard_irqs_count;
364 	unsigned long		gro_bitmask;
365 	int			(*poll)(struct napi_struct *, int);
366 #ifdef CONFIG_NETPOLL
367 	/* CPU actively polling if netpoll is configured */
368 	int			poll_owner;
369 #endif
370 	/* CPU on which NAPI has been scheduled for processing */
371 	int			list_owner;
372 	struct net_device	*dev;
373 	struct gro_list		gro_hash[GRO_HASH_BUCKETS];
374 	struct sk_buff		*skb;
375 	struct list_head	rx_list; /* Pending GRO_NORMAL skbs */
376 	int			rx_count; /* length of rx_list */
377 	unsigned int		napi_id;
378 	struct hrtimer		timer;
379 	struct task_struct	*thread;
380 	/* control-path-only fields follow */
381 	struct list_head	dev_list;
382 	struct hlist_node	napi_hash_node;
383 };
384 
385 enum {
386 	NAPI_STATE_SCHED,		/* Poll is scheduled */
387 	NAPI_STATE_MISSED,		/* reschedule a napi */
388 	NAPI_STATE_DISABLE,		/* Disable pending */
389 	NAPI_STATE_NPSVC,		/* Netpoll - don't dequeue from poll_list */
390 	NAPI_STATE_LISTED,		/* NAPI added to system lists */
391 	NAPI_STATE_NO_BUSY_POLL,	/* Do not add in napi_hash, no busy polling */
392 	NAPI_STATE_IN_BUSY_POLL,	/* sk_busy_loop() owns this NAPI */
393 	NAPI_STATE_PREFER_BUSY_POLL,	/* prefer busy-polling over softirq processing*/
394 	NAPI_STATE_THREADED,		/* The poll is performed inside its own thread*/
395 	NAPI_STATE_SCHED_THREADED,	/* Napi is currently scheduled in threaded mode */
396 };
397 
398 enum {
399 	NAPIF_STATE_SCHED		= BIT(NAPI_STATE_SCHED),
400 	NAPIF_STATE_MISSED		= BIT(NAPI_STATE_MISSED),
401 	NAPIF_STATE_DISABLE		= BIT(NAPI_STATE_DISABLE),
402 	NAPIF_STATE_NPSVC		= BIT(NAPI_STATE_NPSVC),
403 	NAPIF_STATE_LISTED		= BIT(NAPI_STATE_LISTED),
404 	NAPIF_STATE_NO_BUSY_POLL	= BIT(NAPI_STATE_NO_BUSY_POLL),
405 	NAPIF_STATE_IN_BUSY_POLL	= BIT(NAPI_STATE_IN_BUSY_POLL),
406 	NAPIF_STATE_PREFER_BUSY_POLL	= BIT(NAPI_STATE_PREFER_BUSY_POLL),
407 	NAPIF_STATE_THREADED		= BIT(NAPI_STATE_THREADED),
408 	NAPIF_STATE_SCHED_THREADED	= BIT(NAPI_STATE_SCHED_THREADED),
409 };
410 
411 enum gro_result {
412 	GRO_MERGED,
413 	GRO_MERGED_FREE,
414 	GRO_HELD,
415 	GRO_NORMAL,
416 	GRO_CONSUMED,
417 };
418 typedef enum gro_result gro_result_t;
419 
420 /*
421  * enum rx_handler_result - Possible return values for rx_handlers.
422  * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
423  * further.
424  * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
425  * case skb->dev was changed by rx_handler.
426  * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
427  * @RX_HANDLER_PASS: Do nothing, pass the skb as if no rx_handler was called.
428  *
429  * rx_handlers are functions called from inside __netif_receive_skb(), to do
430  * special processing of the skb, prior to delivery to protocol handlers.
431  *
432  * Currently, a net_device can only have a single rx_handler registered. Trying
433  * to register a second rx_handler will return -EBUSY.
434  *
435  * To register a rx_handler on a net_device, use netdev_rx_handler_register().
436  * To unregister a rx_handler on a net_device, use
437  * netdev_rx_handler_unregister().
438  *
439  * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
440  * do with the skb.
441  *
442  * If the rx_handler consumed the skb in some way, it should return
443  * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
444  * the skb to be delivered in some other way.
445  *
446  * If the rx_handler changed skb->dev, to divert the skb to another
447  * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
448  * new device will be called if it exists.
449  *
450  * If the rx_handler decides the skb should be ignored, it should return
451  * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
452  * are registered on exact device (ptype->dev == skb->dev).
453  *
454  * If the rx_handler didn't change skb->dev, but wants the skb to be normally
455  * delivered, it should return RX_HANDLER_PASS.
456  *
457  * A device without a registered rx_handler will behave as if rx_handler
458  * returned RX_HANDLER_PASS.
459  */
460 
461 enum rx_handler_result {
462 	RX_HANDLER_CONSUMED,
463 	RX_HANDLER_ANOTHER,
464 	RX_HANDLER_EXACT,
465 	RX_HANDLER_PASS,
466 };
467 typedef enum rx_handler_result rx_handler_result_t;
468 typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
469 
470 void __napi_schedule(struct napi_struct *n);
471 void __napi_schedule_irqoff(struct napi_struct *n);
472 
napi_disable_pending(struct napi_struct * n)473 static inline bool napi_disable_pending(struct napi_struct *n)
474 {
475 	return test_bit(NAPI_STATE_DISABLE, &n->state);
476 }
477 
napi_prefer_busy_poll(struct napi_struct * n)478 static inline bool napi_prefer_busy_poll(struct napi_struct *n)
479 {
480 	return test_bit(NAPI_STATE_PREFER_BUSY_POLL, &n->state);
481 }
482 
483 bool napi_schedule_prep(struct napi_struct *n);
484 
485 /**
486  *	napi_schedule - schedule NAPI poll
487  *	@n: NAPI context
488  *
489  * Schedule NAPI poll routine to be called if it is not already
490  * running.
491  */
napi_schedule(struct napi_struct * n)492 static inline void napi_schedule(struct napi_struct *n)
493 {
494 	if (napi_schedule_prep(n))
495 		__napi_schedule(n);
496 }
497 
498 /**
499  *	napi_schedule_irqoff - schedule NAPI poll
500  *	@n: NAPI context
501  *
502  * Variant of napi_schedule(), assuming hard irqs are masked.
503  */
napi_schedule_irqoff(struct napi_struct * n)504 static inline void napi_schedule_irqoff(struct napi_struct *n)
505 {
506 	if (napi_schedule_prep(n))
507 		__napi_schedule_irqoff(n);
508 }
509 
510 /* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
napi_reschedule(struct napi_struct * napi)511 static inline bool napi_reschedule(struct napi_struct *napi)
512 {
513 	if (napi_schedule_prep(napi)) {
514 		__napi_schedule(napi);
515 		return true;
516 	}
517 	return false;
518 }
519 
520 /**
521  * napi_complete_done - NAPI processing complete
522  * @n: NAPI context
523  * @work_done: number of packets processed
524  *
525  * Mark NAPI processing as complete. Should only be called if poll budget
526  * has not been completely consumed.
527  * Prefer over napi_complete().
528  * Return false if device should avoid rearming interrupts.
529  */
530 bool napi_complete_done(struct napi_struct *n, int work_done);
531 
napi_complete(struct napi_struct * n)532 static inline bool napi_complete(struct napi_struct *n)
533 {
534 	return napi_complete_done(n, 0);
535 }
536 
537 int dev_set_threaded(struct net_device *dev, bool threaded);
538 
539 /**
540  *	napi_disable - prevent NAPI from scheduling
541  *	@n: NAPI context
542  *
543  * Stop NAPI from being scheduled on this context.
544  * Waits till any outstanding processing completes.
545  */
546 void napi_disable(struct napi_struct *n);
547 
548 void napi_enable(struct napi_struct *n);
549 
550 /**
551  *	napi_synchronize - wait until NAPI is not running
552  *	@n: NAPI context
553  *
554  * Wait until NAPI is done being scheduled on this context.
555  * Waits till any outstanding processing completes but
556  * does not disable future activations.
557  */
napi_synchronize(const struct napi_struct * n)558 static inline void napi_synchronize(const struct napi_struct *n)
559 {
560 	if (IS_ENABLED(CONFIG_SMP))
561 		while (test_bit(NAPI_STATE_SCHED, &n->state))
562 			msleep(1);
563 	else
564 		barrier();
565 }
566 
567 /**
568  *	napi_if_scheduled_mark_missed - if napi is running, set the
569  *	NAPIF_STATE_MISSED
570  *	@n: NAPI context
571  *
572  * If napi is running, set the NAPIF_STATE_MISSED, and return true if
573  * NAPI is scheduled.
574  **/
napi_if_scheduled_mark_missed(struct napi_struct * n)575 static inline bool napi_if_scheduled_mark_missed(struct napi_struct *n)
576 {
577 	unsigned long val, new;
578 
579 	val = READ_ONCE(n->state);
580 	do {
581 		if (val & NAPIF_STATE_DISABLE)
582 			return true;
583 
584 		if (!(val & NAPIF_STATE_SCHED))
585 			return false;
586 
587 		new = val | NAPIF_STATE_MISSED;
588 	} while (!try_cmpxchg(&n->state, &val, new));
589 
590 	return true;
591 }
592 
593 enum netdev_queue_state_t {
594 	__QUEUE_STATE_DRV_XOFF,
595 	__QUEUE_STATE_STACK_XOFF,
596 	__QUEUE_STATE_FROZEN,
597 };
598 
599 #define QUEUE_STATE_DRV_XOFF	(1 << __QUEUE_STATE_DRV_XOFF)
600 #define QUEUE_STATE_STACK_XOFF	(1 << __QUEUE_STATE_STACK_XOFF)
601 #define QUEUE_STATE_FROZEN	(1 << __QUEUE_STATE_FROZEN)
602 
603 #define QUEUE_STATE_ANY_XOFF	(QUEUE_STATE_DRV_XOFF | QUEUE_STATE_STACK_XOFF)
604 #define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF | \
605 					QUEUE_STATE_FROZEN)
606 #define QUEUE_STATE_DRV_XOFF_OR_FROZEN (QUEUE_STATE_DRV_XOFF | \
607 					QUEUE_STATE_FROZEN)
608 
609 /*
610  * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue.  The
611  * netif_tx_* functions below are used to manipulate this flag.  The
612  * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
613  * queue independently.  The netif_xmit_*stopped functions below are called
614  * to check if the queue has been stopped by the driver or stack (either
615  * of the XOFF bits are set in the state).  Drivers should not need to call
616  * netif_xmit*stopped functions, they should only be using netif_tx_*.
617  */
618 
619 struct netdev_queue {
620 /*
621  * read-mostly part
622  */
623 	struct net_device	*dev;
624 	netdevice_tracker	dev_tracker;
625 
626 	struct Qdisc __rcu	*qdisc;
627 	struct Qdisc __rcu	*qdisc_sleeping;
628 #ifdef CONFIG_SYSFS
629 	struct kobject		kobj;
630 #endif
631 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
632 	int			numa_node;
633 #endif
634 	unsigned long		tx_maxrate;
635 	/*
636 	 * Number of TX timeouts for this queue
637 	 * (/sys/class/net/DEV/Q/trans_timeout)
638 	 */
639 	atomic_long_t		trans_timeout;
640 
641 	/* Subordinate device that the queue has been assigned to */
642 	struct net_device	*sb_dev;
643 #ifdef CONFIG_XDP_SOCKETS
644 	struct xsk_buff_pool    *pool;
645 #endif
646 /*
647  * write-mostly part
648  */
649 	spinlock_t		_xmit_lock ____cacheline_aligned_in_smp;
650 	int			xmit_lock_owner;
651 	/*
652 	 * Time (in jiffies) of last Tx
653 	 */
654 	unsigned long		trans_start;
655 
656 	unsigned long		state;
657 
658 #ifdef CONFIG_BQL
659 	struct dql		dql;
660 #endif
661 } ____cacheline_aligned_in_smp;
662 
663 extern int sysctl_fb_tunnels_only_for_init_net;
664 extern int sysctl_devconf_inherit_init_net;
665 
666 /*
667  * sysctl_fb_tunnels_only_for_init_net == 0 : For all netns
668  *                                     == 1 : For initns only
669  *                                     == 2 : For none.
670  */
net_has_fallback_tunnels(const struct net * net)671 static inline bool net_has_fallback_tunnels(const struct net *net)
672 {
673 #if IS_ENABLED(CONFIG_SYSCTL)
674 	int fb_tunnels_only_for_init_net = READ_ONCE(sysctl_fb_tunnels_only_for_init_net);
675 
676 	return !fb_tunnels_only_for_init_net ||
677 		(net_eq(net, &init_net) && fb_tunnels_only_for_init_net == 1);
678 #else
679 	return true;
680 #endif
681 }
682 
net_inherit_devconf(void)683 static inline int net_inherit_devconf(void)
684 {
685 #if IS_ENABLED(CONFIG_SYSCTL)
686 	return READ_ONCE(sysctl_devconf_inherit_init_net);
687 #else
688 	return 0;
689 #endif
690 }
691 
netdev_queue_numa_node_read(const struct netdev_queue * q)692 static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
693 {
694 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
695 	return q->numa_node;
696 #else
697 	return NUMA_NO_NODE;
698 #endif
699 }
700 
netdev_queue_numa_node_write(struct netdev_queue * q,int node)701 static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
702 {
703 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
704 	q->numa_node = node;
705 #endif
706 }
707 
708 #ifdef CONFIG_RPS
709 /*
710  * This structure holds an RPS map which can be of variable length.  The
711  * map is an array of CPUs.
712  */
713 struct rps_map {
714 	unsigned int len;
715 	struct rcu_head rcu;
716 	u16 cpus[];
717 };
718 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
719 
720 /*
721  * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
722  * tail pointer for that CPU's input queue at the time of last enqueue, and
723  * a hardware filter index.
724  */
725 struct rps_dev_flow {
726 	u16 cpu;
727 	u16 filter;
728 	unsigned int last_qtail;
729 };
730 #define RPS_NO_FILTER 0xffff
731 
732 /*
733  * The rps_dev_flow_table structure contains a table of flow mappings.
734  */
735 struct rps_dev_flow_table {
736 	unsigned int mask;
737 	struct rcu_head rcu;
738 	struct rps_dev_flow flows[];
739 };
740 #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
741     ((_num) * sizeof(struct rps_dev_flow)))
742 
743 /*
744  * The rps_sock_flow_table contains mappings of flows to the last CPU
745  * on which they were processed by the application (set in recvmsg).
746  * Each entry is a 32bit value. Upper part is the high-order bits
747  * of flow hash, lower part is CPU number.
748  * rps_cpu_mask is used to partition the space, depending on number of
749  * possible CPUs : rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1
750  * For example, if 64 CPUs are possible, rps_cpu_mask = 0x3f,
751  * meaning we use 32-6=26 bits for the hash.
752  */
753 struct rps_sock_flow_table {
754 	u32	mask;
755 
756 	u32	ents[] ____cacheline_aligned_in_smp;
757 };
758 #define	RPS_SOCK_FLOW_TABLE_SIZE(_num) (offsetof(struct rps_sock_flow_table, ents[_num]))
759 
760 #define RPS_NO_CPU 0xffff
761 
762 extern u32 rps_cpu_mask;
763 extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
764 
rps_record_sock_flow(struct rps_sock_flow_table * table,u32 hash)765 static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
766 					u32 hash)
767 {
768 	if (table && hash) {
769 		unsigned int index = hash & table->mask;
770 		u32 val = hash & ~rps_cpu_mask;
771 
772 		/* We only give a hint, preemption can change CPU under us */
773 		val |= raw_smp_processor_id();
774 
775 		/* The following WRITE_ONCE() is paired with the READ_ONCE()
776 		 * here, and another one in get_rps_cpu().
777 		 */
778 		if (READ_ONCE(table->ents[index]) != val)
779 			WRITE_ONCE(table->ents[index], val);
780 	}
781 }
782 
783 #ifdef CONFIG_RFS_ACCEL
784 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id,
785 			 u16 filter_id);
786 #endif
787 #endif /* CONFIG_RPS */
788 
789 /* XPS map type and offset of the xps map within net_device->xps_maps[]. */
790 enum xps_map_type {
791 	XPS_CPUS = 0,
792 	XPS_RXQS,
793 	XPS_MAPS_MAX,
794 };
795 
796 #ifdef CONFIG_XPS
797 /*
798  * This structure holds an XPS map which can be of variable length.  The
799  * map is an array of queues.
800  */
801 struct xps_map {
802 	unsigned int len;
803 	unsigned int alloc_len;
804 	struct rcu_head rcu;
805 	u16 queues[];
806 };
807 #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
808 #define XPS_MIN_MAP_ALLOC ((L1_CACHE_ALIGN(offsetof(struct xps_map, queues[1])) \
809        - sizeof(struct xps_map)) / sizeof(u16))
810 
811 /*
812  * This structure holds all XPS maps for device.  Maps are indexed by CPU.
813  *
814  * We keep track of the number of cpus/rxqs used when the struct is allocated,
815  * in nr_ids. This will help not accessing out-of-bound memory.
816  *
817  * We keep track of the number of traffic classes used when the struct is
818  * allocated, in num_tc. This will be used to navigate the maps, to ensure we're
819  * not crossing its upper bound, as the original dev->num_tc can be updated in
820  * the meantime.
821  */
822 struct xps_dev_maps {
823 	struct rcu_head rcu;
824 	unsigned int nr_ids;
825 	s16 num_tc;
826 	struct xps_map __rcu *attr_map[]; /* Either CPUs map or RXQs map */
827 };
828 
829 #define XPS_CPU_DEV_MAPS_SIZE(_tcs) (sizeof(struct xps_dev_maps) +	\
830 	(nr_cpu_ids * (_tcs) * sizeof(struct xps_map *)))
831 
832 #define XPS_RXQ_DEV_MAPS_SIZE(_tcs, _rxqs) (sizeof(struct xps_dev_maps) +\
833 	(_rxqs * (_tcs) * sizeof(struct xps_map *)))
834 
835 #endif /* CONFIG_XPS */
836 
837 #define TC_MAX_QUEUE	16
838 #define TC_BITMASK	15
839 /* HW offloaded queuing disciplines txq count and offset maps */
840 struct netdev_tc_txq {
841 	u16 count;
842 	u16 offset;
843 };
844 
845 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
846 /*
847  * This structure is to hold information about the device
848  * configured to run FCoE protocol stack.
849  */
850 struct netdev_fcoe_hbainfo {
851 	char	manufacturer[64];
852 	char	serial_number[64];
853 	char	hardware_version[64];
854 	char	driver_version[64];
855 	char	optionrom_version[64];
856 	char	firmware_version[64];
857 	char	model[256];
858 	char	model_description[256];
859 };
860 #endif
861 
862 #define MAX_PHYS_ITEM_ID_LEN 32
863 
864 /* This structure holds a unique identifier to identify some
865  * physical item (port for example) used by a netdevice.
866  */
867 struct netdev_phys_item_id {
868 	unsigned char id[MAX_PHYS_ITEM_ID_LEN];
869 	unsigned char id_len;
870 };
871 
netdev_phys_item_id_same(struct netdev_phys_item_id * a,struct netdev_phys_item_id * b)872 static inline bool netdev_phys_item_id_same(struct netdev_phys_item_id *a,
873 					    struct netdev_phys_item_id *b)
874 {
875 	return a->id_len == b->id_len &&
876 	       memcmp(a->id, b->id, a->id_len) == 0;
877 }
878 
879 typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
880 				       struct sk_buff *skb,
881 				       struct net_device *sb_dev);
882 
883 enum net_device_path_type {
884 	DEV_PATH_ETHERNET = 0,
885 	DEV_PATH_VLAN,
886 	DEV_PATH_BRIDGE,
887 	DEV_PATH_PPPOE,
888 	DEV_PATH_DSA,
889 	DEV_PATH_MTK_WDMA,
890 };
891 
892 struct net_device_path {
893 	enum net_device_path_type	type;
894 	const struct net_device		*dev;
895 	union {
896 		struct {
897 			u16		id;
898 			__be16		proto;
899 			u8		h_dest[ETH_ALEN];
900 		} encap;
901 		struct {
902 			enum {
903 				DEV_PATH_BR_VLAN_KEEP,
904 				DEV_PATH_BR_VLAN_TAG,
905 				DEV_PATH_BR_VLAN_UNTAG,
906 				DEV_PATH_BR_VLAN_UNTAG_HW,
907 			}		vlan_mode;
908 			u16		vlan_id;
909 			__be16		vlan_proto;
910 		} bridge;
911 		struct {
912 			int port;
913 			u16 proto;
914 		} dsa;
915 		struct {
916 			u8 wdma_idx;
917 			u8 queue;
918 			u16 wcid;
919 			u8 bss;
920 		} mtk_wdma;
921 	};
922 };
923 
924 #define NET_DEVICE_PATH_STACK_MAX	5
925 #define NET_DEVICE_PATH_VLAN_MAX	2
926 
927 struct net_device_path_stack {
928 	int			num_paths;
929 	struct net_device_path	path[NET_DEVICE_PATH_STACK_MAX];
930 };
931 
932 struct net_device_path_ctx {
933 	const struct net_device *dev;
934 	u8			daddr[ETH_ALEN];
935 
936 	int			num_vlans;
937 	struct {
938 		u16		id;
939 		__be16		proto;
940 	} vlan[NET_DEVICE_PATH_VLAN_MAX];
941 };
942 
943 enum tc_setup_type {
944 	TC_QUERY_CAPS,
945 	TC_SETUP_QDISC_MQPRIO,
946 	TC_SETUP_CLSU32,
947 	TC_SETUP_CLSFLOWER,
948 	TC_SETUP_CLSMATCHALL,
949 	TC_SETUP_CLSBPF,
950 	TC_SETUP_BLOCK,
951 	TC_SETUP_QDISC_CBS,
952 	TC_SETUP_QDISC_RED,
953 	TC_SETUP_QDISC_PRIO,
954 	TC_SETUP_QDISC_MQ,
955 	TC_SETUP_QDISC_ETF,
956 	TC_SETUP_ROOT_QDISC,
957 	TC_SETUP_QDISC_GRED,
958 	TC_SETUP_QDISC_TAPRIO,
959 	TC_SETUP_FT,
960 	TC_SETUP_QDISC_ETS,
961 	TC_SETUP_QDISC_TBF,
962 	TC_SETUP_QDISC_FIFO,
963 	TC_SETUP_QDISC_HTB,
964 	TC_SETUP_ACT,
965 };
966 
967 /* These structures hold the attributes of bpf state that are being passed
968  * to the netdevice through the bpf op.
969  */
970 enum bpf_netdev_command {
971 	/* Set or clear a bpf program used in the earliest stages of packet
972 	 * rx. The prog will have been loaded as BPF_PROG_TYPE_XDP. The callee
973 	 * is responsible for calling bpf_prog_put on any old progs that are
974 	 * stored. In case of error, the callee need not release the new prog
975 	 * reference, but on success it takes ownership and must bpf_prog_put
976 	 * when it is no longer used.
977 	 */
978 	XDP_SETUP_PROG,
979 	XDP_SETUP_PROG_HW,
980 	/* BPF program for offload callbacks, invoked at program load time. */
981 	BPF_OFFLOAD_MAP_ALLOC,
982 	BPF_OFFLOAD_MAP_FREE,
983 	XDP_SETUP_XSK_POOL,
984 };
985 
986 struct bpf_prog_offload_ops;
987 struct netlink_ext_ack;
988 struct xdp_umem;
989 struct xdp_dev_bulk_queue;
990 struct bpf_xdp_link;
991 
992 enum bpf_xdp_mode {
993 	XDP_MODE_SKB = 0,
994 	XDP_MODE_DRV = 1,
995 	XDP_MODE_HW = 2,
996 	__MAX_XDP_MODE
997 };
998 
999 struct bpf_xdp_entity {
1000 	struct bpf_prog *prog;
1001 	struct bpf_xdp_link *link;
1002 };
1003 
1004 struct netdev_bpf {
1005 	enum bpf_netdev_command command;
1006 	union {
1007 		/* XDP_SETUP_PROG */
1008 		struct {
1009 			u32 flags;
1010 			struct bpf_prog *prog;
1011 			struct netlink_ext_ack *extack;
1012 		};
1013 		/* BPF_OFFLOAD_MAP_ALLOC, BPF_OFFLOAD_MAP_FREE */
1014 		struct {
1015 			struct bpf_offloaded_map *offmap;
1016 		};
1017 		/* XDP_SETUP_XSK_POOL */
1018 		struct {
1019 			struct xsk_buff_pool *pool;
1020 			u16 queue_id;
1021 		} xsk;
1022 	};
1023 };
1024 
1025 /* Flags for ndo_xsk_wakeup. */
1026 #define XDP_WAKEUP_RX (1 << 0)
1027 #define XDP_WAKEUP_TX (1 << 1)
1028 
1029 #ifdef CONFIG_XFRM_OFFLOAD
1030 struct xfrmdev_ops {
1031 	int	(*xdo_dev_state_add) (struct xfrm_state *x, struct netlink_ext_ack *extack);
1032 	void	(*xdo_dev_state_delete) (struct xfrm_state *x);
1033 	void	(*xdo_dev_state_free) (struct xfrm_state *x);
1034 	bool	(*xdo_dev_offload_ok) (struct sk_buff *skb,
1035 				       struct xfrm_state *x);
1036 	void	(*xdo_dev_state_advance_esn) (struct xfrm_state *x);
1037 	void	(*xdo_dev_state_update_curlft) (struct xfrm_state *x);
1038 	int	(*xdo_dev_policy_add) (struct xfrm_policy *x, struct netlink_ext_ack *extack);
1039 	void	(*xdo_dev_policy_delete) (struct xfrm_policy *x);
1040 	void	(*xdo_dev_policy_free) (struct xfrm_policy *x);
1041 };
1042 #endif
1043 
1044 struct dev_ifalias {
1045 	struct rcu_head rcuhead;
1046 	char ifalias[];
1047 };
1048 
1049 struct devlink;
1050 struct tlsdev_ops;
1051 
1052 struct netdev_net_notifier {
1053 	struct list_head list;
1054 	struct notifier_block *nb;
1055 };
1056 
1057 /*
1058  * This structure defines the management hooks for network devices.
1059  * The following hooks can be defined; unless noted otherwise, they are
1060  * optional and can be filled with a null pointer.
1061  *
1062  * int (*ndo_init)(struct net_device *dev);
1063  *     This function is called once when a network device is registered.
1064  *     The network device can use this for any late stage initialization
1065  *     or semantic validation. It can fail with an error code which will
1066  *     be propagated back to register_netdev.
1067  *
1068  * void (*ndo_uninit)(struct net_device *dev);
1069  *     This function is called when device is unregistered or when registration
1070  *     fails. It is not called if init fails.
1071  *
1072  * int (*ndo_open)(struct net_device *dev);
1073  *     This function is called when a network device transitions to the up
1074  *     state.
1075  *
1076  * int (*ndo_stop)(struct net_device *dev);
1077  *     This function is called when a network device transitions to the down
1078  *     state.
1079  *
1080  * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
1081  *                               struct net_device *dev);
1082  *	Called when a packet needs to be transmitted.
1083  *	Returns NETDEV_TX_OK.  Can return NETDEV_TX_BUSY, but you should stop
1084  *	the queue before that can happen; it's for obsolete devices and weird
1085  *	corner cases, but the stack really does a non-trivial amount
1086  *	of useless work if you return NETDEV_TX_BUSY.
1087  *	Required; cannot be NULL.
1088  *
1089  * netdev_features_t (*ndo_features_check)(struct sk_buff *skb,
1090  *					   struct net_device *dev
1091  *					   netdev_features_t features);
1092  *	Called by core transmit path to determine if device is capable of
1093  *	performing offload operations on a given packet. This is to give
1094  *	the device an opportunity to implement any restrictions that cannot
1095  *	be otherwise expressed by feature flags. The check is called with
1096  *	the set of features that the stack has calculated and it returns
1097  *	those the driver believes to be appropriate.
1098  *
1099  * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb,
1100  *                         struct net_device *sb_dev);
1101  *	Called to decide which queue to use when device supports multiple
1102  *	transmit queues.
1103  *
1104  * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
1105  *	This function is called to allow device receiver to make
1106  *	changes to configuration when multicast or promiscuous is enabled.
1107  *
1108  * void (*ndo_set_rx_mode)(struct net_device *dev);
1109  *	This function is called device changes address list filtering.
1110  *	If driver handles unicast address filtering, it should set
1111  *	IFF_UNICAST_FLT in its priv_flags.
1112  *
1113  * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
1114  *	This function  is called when the Media Access Control address
1115  *	needs to be changed. If this interface is not defined, the
1116  *	MAC address can not be changed.
1117  *
1118  * int (*ndo_validate_addr)(struct net_device *dev);
1119  *	Test if Media Access Control address is valid for the device.
1120  *
1121  * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
1122  *	Old-style ioctl entry point. This is used internally by the
1123  *	appletalk and ieee802154 subsystems but is no longer called by
1124  *	the device ioctl handler.
1125  *
1126  * int (*ndo_siocbond)(struct net_device *dev, struct ifreq *ifr, int cmd);
1127  *	Used by the bonding driver for its device specific ioctls:
1128  *	SIOCBONDENSLAVE, SIOCBONDRELEASE, SIOCBONDSETHWADDR, SIOCBONDCHANGEACTIVE,
1129  *	SIOCBONDSLAVEINFOQUERY, and SIOCBONDINFOQUERY
1130  *
1131  * * int (*ndo_eth_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
1132  *	Called for ethernet specific ioctls: SIOCGMIIPHY, SIOCGMIIREG,
1133  *	SIOCSMIIREG, SIOCSHWTSTAMP and SIOCGHWTSTAMP.
1134  *
1135  * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
1136  *	Used to set network devices bus interface parameters. This interface
1137  *	is retained for legacy reasons; new devices should use the bus
1138  *	interface (PCI) for low level management.
1139  *
1140  * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
1141  *	Called when a user wants to change the Maximum Transfer Unit
1142  *	of a device.
1143  *
1144  * void (*ndo_tx_timeout)(struct net_device *dev, unsigned int txqueue);
1145  *	Callback used when the transmitter has not made any progress
1146  *	for dev->watchdog ticks.
1147  *
1148  * void (*ndo_get_stats64)(struct net_device *dev,
1149  *                         struct rtnl_link_stats64 *storage);
1150  * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
1151  *	Called when a user wants to get the network device usage
1152  *	statistics. Drivers must do one of the following:
1153  *	1. Define @ndo_get_stats64 to fill in a zero-initialised
1154  *	   rtnl_link_stats64 structure passed by the caller.
1155  *	2. Define @ndo_get_stats to update a net_device_stats structure
1156  *	   (which should normally be dev->stats) and return a pointer to
1157  *	   it. The structure may be changed asynchronously only if each
1158  *	   field is written atomically.
1159  *	3. Update dev->stats asynchronously and atomically, and define
1160  *	   neither operation.
1161  *
1162  * bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id)
1163  *	Return true if this device supports offload stats of this attr_id.
1164  *
1165  * int (*ndo_get_offload_stats)(int attr_id, const struct net_device *dev,
1166  *	void *attr_data)
1167  *	Get statistics for offload operations by attr_id. Write it into the
1168  *	attr_data pointer.
1169  *
1170  * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16 vid);
1171  *	If device supports VLAN filtering this function is called when a
1172  *	VLAN id is registered.
1173  *
1174  * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, __be16 proto, u16 vid);
1175  *	If device supports VLAN filtering this function is called when a
1176  *	VLAN id is unregistered.
1177  *
1178  * void (*ndo_poll_controller)(struct net_device *dev);
1179  *
1180  *	SR-IOV management functions.
1181  * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
1182  * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan,
1183  *			  u8 qos, __be16 proto);
1184  * int (*ndo_set_vf_rate)(struct net_device *dev, int vf, int min_tx_rate,
1185  *			  int max_tx_rate);
1186  * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
1187  * int (*ndo_set_vf_trust)(struct net_device *dev, int vf, bool setting);
1188  * int (*ndo_get_vf_config)(struct net_device *dev,
1189  *			    int vf, struct ifla_vf_info *ivf);
1190  * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state);
1191  * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
1192  *			  struct nlattr *port[]);
1193  *
1194  *      Enable or disable the VF ability to query its RSS Redirection Table and
1195  *      Hash Key. This is needed since on some devices VF share this information
1196  *      with PF and querying it may introduce a theoretical security risk.
1197  * int (*ndo_set_vf_rss_query_en)(struct net_device *dev, int vf, bool setting);
1198  * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
1199  * int (*ndo_setup_tc)(struct net_device *dev, enum tc_setup_type type,
1200  *		       void *type_data);
1201  *	Called to setup any 'tc' scheduler, classifier or action on @dev.
1202  *	This is always called from the stack with the rtnl lock held and netif
1203  *	tx queues stopped. This allows the netdevice to perform queue
1204  *	management safely.
1205  *
1206  *	Fiber Channel over Ethernet (FCoE) offload functions.
1207  * int (*ndo_fcoe_enable)(struct net_device *dev);
1208  *	Called when the FCoE protocol stack wants to start using LLD for FCoE
1209  *	so the underlying device can perform whatever needed configuration or
1210  *	initialization to support acceleration of FCoE traffic.
1211  *
1212  * int (*ndo_fcoe_disable)(struct net_device *dev);
1213  *	Called when the FCoE protocol stack wants to stop using LLD for FCoE
1214  *	so the underlying device can perform whatever needed clean-ups to
1215  *	stop supporting acceleration of FCoE traffic.
1216  *
1217  * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid,
1218  *			     struct scatterlist *sgl, unsigned int sgc);
1219  *	Called when the FCoE Initiator wants to initialize an I/O that
1220  *	is a possible candidate for Direct Data Placement (DDP). The LLD can
1221  *	perform necessary setup and returns 1 to indicate the device is set up
1222  *	successfully to perform DDP on this I/O, otherwise this returns 0.
1223  *
1224  * int (*ndo_fcoe_ddp_done)(struct net_device *dev,  u16 xid);
1225  *	Called when the FCoE Initiator/Target is done with the DDPed I/O as
1226  *	indicated by the FC exchange id 'xid', so the underlying device can
1227  *	clean up and reuse resources for later DDP requests.
1228  *
1229  * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid,
1230  *			      struct scatterlist *sgl, unsigned int sgc);
1231  *	Called when the FCoE Target wants to initialize an I/O that
1232  *	is a possible candidate for Direct Data Placement (DDP). The LLD can
1233  *	perform necessary setup and returns 1 to indicate the device is set up
1234  *	successfully to perform DDP on this I/O, otherwise this returns 0.
1235  *
1236  * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
1237  *			       struct netdev_fcoe_hbainfo *hbainfo);
1238  *	Called when the FCoE Protocol stack wants information on the underlying
1239  *	device. This information is utilized by the FCoE protocol stack to
1240  *	register attributes with Fiber Channel management service as per the
1241  *	FC-GS Fabric Device Management Information(FDMI) specification.
1242  *
1243  * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type);
1244  *	Called when the underlying device wants to override default World Wide
1245  *	Name (WWN) generation mechanism in FCoE protocol stack to pass its own
1246  *	World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE
1247  *	protocol stack to use.
1248  *
1249  *	RFS acceleration.
1250  * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb,
1251  *			    u16 rxq_index, u32 flow_id);
1252  *	Set hardware filter for RFS.  rxq_index is the target queue index;
1253  *	flow_id is a flow ID to be passed to rps_may_expire_flow() later.
1254  *	Return the filter ID on success, or a negative error code.
1255  *
1256  *	Slave management functions (for bridge, bonding, etc).
1257  * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
1258  *	Called to make another netdev an underling.
1259  *
1260  * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
1261  *	Called to release previously enslaved netdev.
1262  *
1263  * struct net_device *(*ndo_get_xmit_slave)(struct net_device *dev,
1264  *					    struct sk_buff *skb,
1265  *					    bool all_slaves);
1266  *	Get the xmit slave of master device. If all_slaves is true, function
1267  *	assume all the slaves can transmit.
1268  *
1269  *      Feature/offload setting functions.
1270  * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
1271  *		netdev_features_t features);
1272  *	Adjusts the requested feature flags according to device-specific
1273  *	constraints, and returns the resulting flags. Must not modify
1274  *	the device state.
1275  *
1276  * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
1277  *	Called to update device configuration to new features. Passed
1278  *	feature set might be less than what was returned by ndo_fix_features()).
1279  *	Must return >0 or -errno if it changed dev->features itself.
1280  *
1281  * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
1282  *		      struct net_device *dev,
1283  *		      const unsigned char *addr, u16 vid, u16 flags,
1284  *		      struct netlink_ext_ack *extack);
1285  *	Adds an FDB entry to dev for addr.
1286  * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[],
1287  *		      struct net_device *dev,
1288  *		      const unsigned char *addr, u16 vid)
1289  *	Deletes the FDB entry from dev coresponding to addr.
1290  * int (*ndo_fdb_del_bulk)(struct ndmsg *ndm, struct nlattr *tb[],
1291  *			   struct net_device *dev,
1292  *			   u16 vid,
1293  *			   struct netlink_ext_ack *extack);
1294  * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
1295  *		       struct net_device *dev, struct net_device *filter_dev,
1296  *		       int *idx)
1297  *	Used to add FDB entries to dump requests. Implementers should add
1298  *	entries to skb and update idx with the number of entries.
1299  *
1300  * int (*ndo_mdb_add)(struct net_device *dev, struct nlattr *tb[],
1301  *		      u16 nlmsg_flags, struct netlink_ext_ack *extack);
1302  *	Adds an MDB entry to dev.
1303  * int (*ndo_mdb_del)(struct net_device *dev, struct nlattr *tb[],
1304  *		      struct netlink_ext_ack *extack);
1305  *	Deletes the MDB entry from dev.
1306  * int (*ndo_mdb_dump)(struct net_device *dev, struct sk_buff *skb,
1307  *		       struct netlink_callback *cb);
1308  *	Dumps MDB entries from dev. The first argument (marker) in the netlink
1309  *	callback is used by core rtnetlink code.
1310  *
1311  * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh,
1312  *			     u16 flags, struct netlink_ext_ack *extack)
1313  * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq,
1314  *			     struct net_device *dev, u32 filter_mask,
1315  *			     int nlflags)
1316  * int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh,
1317  *			     u16 flags);
1318  *
1319  * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier);
1320  *	Called to change device carrier. Soft-devices (like dummy, team, etc)
1321  *	which do not represent real hardware may define this to allow their
1322  *	userspace components to manage their virtual carrier state. Devices
1323  *	that determine carrier state from physical hardware properties (eg
1324  *	network cables) or protocol-dependent mechanisms (eg
1325  *	USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function.
1326  *
1327  * int (*ndo_get_phys_port_id)(struct net_device *dev,
1328  *			       struct netdev_phys_item_id *ppid);
1329  *	Called to get ID of physical port of this device. If driver does
1330  *	not implement this, it is assumed that the hw is not able to have
1331  *	multiple net devices on single physical port.
1332  *
1333  * int (*ndo_get_port_parent_id)(struct net_device *dev,
1334  *				 struct netdev_phys_item_id *ppid)
1335  *	Called to get the parent ID of the physical port of this device.
1336  *
1337  * void* (*ndo_dfwd_add_station)(struct net_device *pdev,
1338  *				 struct net_device *dev)
1339  *	Called by upper layer devices to accelerate switching or other
1340  *	station functionality into hardware. 'pdev is the lowerdev
1341  *	to use for the offload and 'dev' is the net device that will
1342  *	back the offload. Returns a pointer to the private structure
1343  *	the upper layer will maintain.
1344  * void (*ndo_dfwd_del_station)(struct net_device *pdev, void *priv)
1345  *	Called by upper layer device to delete the station created
1346  *	by 'ndo_dfwd_add_station'. 'pdev' is the net device backing
1347  *	the station and priv is the structure returned by the add
1348  *	operation.
1349  * int (*ndo_set_tx_maxrate)(struct net_device *dev,
1350  *			     int queue_index, u32 maxrate);
1351  *	Called when a user wants to set a max-rate limitation of specific
1352  *	TX queue.
1353  * int (*ndo_get_iflink)(const struct net_device *dev);
1354  *	Called to get the iflink value of this device.
1355  * int (*ndo_fill_metadata_dst)(struct net_device *dev, struct sk_buff *skb);
1356  *	This function is used to get egress tunnel information for given skb.
1357  *	This is useful for retrieving outer tunnel header parameters while
1358  *	sampling packet.
1359  * void (*ndo_set_rx_headroom)(struct net_device *dev, int needed_headroom);
1360  *	This function is used to specify the headroom that the skb must
1361  *	consider when allocation skb during packet reception. Setting
1362  *	appropriate rx headroom value allows avoiding skb head copy on
1363  *	forward. Setting a negative value resets the rx headroom to the
1364  *	default value.
1365  * int (*ndo_bpf)(struct net_device *dev, struct netdev_bpf *bpf);
1366  *	This function is used to set or query state related to XDP on the
1367  *	netdevice and manage BPF offload. See definition of
1368  *	enum bpf_netdev_command for details.
1369  * int (*ndo_xdp_xmit)(struct net_device *dev, int n, struct xdp_frame **xdp,
1370  *			u32 flags);
1371  *	This function is used to submit @n XDP packets for transmit on a
1372  *	netdevice. Returns number of frames successfully transmitted, frames
1373  *	that got dropped are freed/returned via xdp_return_frame().
1374  *	Returns negative number, means general error invoking ndo, meaning
1375  *	no frames were xmit'ed and core-caller will free all frames.
1376  * struct net_device *(*ndo_xdp_get_xmit_slave)(struct net_device *dev,
1377  *					        struct xdp_buff *xdp);
1378  *      Get the xmit slave of master device based on the xdp_buff.
1379  * int (*ndo_xsk_wakeup)(struct net_device *dev, u32 queue_id, u32 flags);
1380  *      This function is used to wake up the softirq, ksoftirqd or kthread
1381  *	responsible for sending and/or receiving packets on a specific
1382  *	queue id bound to an AF_XDP socket. The flags field specifies if
1383  *	only RX, only Tx, or both should be woken up using the flags
1384  *	XDP_WAKEUP_RX and XDP_WAKEUP_TX.
1385  * int (*ndo_tunnel_ctl)(struct net_device *dev, struct ip_tunnel_parm *p,
1386  *			 int cmd);
1387  *	Add, change, delete or get information on an IPv4 tunnel.
1388  * struct net_device *(*ndo_get_peer_dev)(struct net_device *dev);
1389  *	If a device is paired with a peer device, return the peer instance.
1390  *	The caller must be under RCU read context.
1391  * int (*ndo_fill_forward_path)(struct net_device_path_ctx *ctx, struct net_device_path *path);
1392  *     Get the forwarding path to reach the real device from the HW destination address
1393  * ktime_t (*ndo_get_tstamp)(struct net_device *dev,
1394  *			     const struct skb_shared_hwtstamps *hwtstamps,
1395  *			     bool cycles);
1396  *	Get hardware timestamp based on normal/adjustable time or free running
1397  *	cycle counter. This function is required if physical clock supports a
1398  *	free running cycle counter.
1399  *
1400  * int (*ndo_hwtstamp_get)(struct net_device *dev,
1401  *			   struct kernel_hwtstamp_config *kernel_config);
1402  *	Get the currently configured hardware timestamping parameters for the
1403  *	NIC device.
1404  *
1405  * int (*ndo_hwtstamp_set)(struct net_device *dev,
1406  *			   struct kernel_hwtstamp_config *kernel_config,
1407  *			   struct netlink_ext_ack *extack);
1408  *	Change the hardware timestamping parameters for NIC device.
1409  */
1410 struct net_device_ops {
1411 	int			(*ndo_init)(struct net_device *dev);
1412 	void			(*ndo_uninit)(struct net_device *dev);
1413 	int			(*ndo_open)(struct net_device *dev);
1414 	int			(*ndo_stop)(struct net_device *dev);
1415 	netdev_tx_t		(*ndo_start_xmit)(struct sk_buff *skb,
1416 						  struct net_device *dev);
1417 	netdev_features_t	(*ndo_features_check)(struct sk_buff *skb,
1418 						      struct net_device *dev,
1419 						      netdev_features_t features);
1420 	u16			(*ndo_select_queue)(struct net_device *dev,
1421 						    struct sk_buff *skb,
1422 						    struct net_device *sb_dev);
1423 	void			(*ndo_change_rx_flags)(struct net_device *dev,
1424 						       int flags);
1425 	void			(*ndo_set_rx_mode)(struct net_device *dev);
1426 	int			(*ndo_set_mac_address)(struct net_device *dev,
1427 						       void *addr);
1428 	int			(*ndo_validate_addr)(struct net_device *dev);
1429 	int			(*ndo_do_ioctl)(struct net_device *dev,
1430 					        struct ifreq *ifr, int cmd);
1431 	int			(*ndo_eth_ioctl)(struct net_device *dev,
1432 						 struct ifreq *ifr, int cmd);
1433 	int			(*ndo_siocbond)(struct net_device *dev,
1434 						struct ifreq *ifr, int cmd);
1435 	int			(*ndo_siocwandev)(struct net_device *dev,
1436 						  struct if_settings *ifs);
1437 	int			(*ndo_siocdevprivate)(struct net_device *dev,
1438 						      struct ifreq *ifr,
1439 						      void __user *data, int cmd);
1440 	int			(*ndo_set_config)(struct net_device *dev,
1441 					          struct ifmap *map);
1442 	int			(*ndo_change_mtu)(struct net_device *dev,
1443 						  int new_mtu);
1444 	int			(*ndo_neigh_setup)(struct net_device *dev,
1445 						   struct neigh_parms *);
1446 	void			(*ndo_tx_timeout) (struct net_device *dev,
1447 						   unsigned int txqueue);
1448 
1449 	void			(*ndo_get_stats64)(struct net_device *dev,
1450 						   struct rtnl_link_stats64 *storage);
1451 	bool			(*ndo_has_offload_stats)(const struct net_device *dev, int attr_id);
1452 	int			(*ndo_get_offload_stats)(int attr_id,
1453 							 const struct net_device *dev,
1454 							 void *attr_data);
1455 	struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
1456 
1457 	int			(*ndo_vlan_rx_add_vid)(struct net_device *dev,
1458 						       __be16 proto, u16 vid);
1459 	int			(*ndo_vlan_rx_kill_vid)(struct net_device *dev,
1460 						        __be16 proto, u16 vid);
1461 #ifdef CONFIG_NET_POLL_CONTROLLER
1462 	void                    (*ndo_poll_controller)(struct net_device *dev);
1463 	int			(*ndo_netpoll_setup)(struct net_device *dev,
1464 						     struct netpoll_info *info);
1465 	void			(*ndo_netpoll_cleanup)(struct net_device *dev);
1466 #endif
1467 	int			(*ndo_set_vf_mac)(struct net_device *dev,
1468 						  int queue, u8 *mac);
1469 	int			(*ndo_set_vf_vlan)(struct net_device *dev,
1470 						   int queue, u16 vlan,
1471 						   u8 qos, __be16 proto);
1472 	int			(*ndo_set_vf_rate)(struct net_device *dev,
1473 						   int vf, int min_tx_rate,
1474 						   int max_tx_rate);
1475 	int			(*ndo_set_vf_spoofchk)(struct net_device *dev,
1476 						       int vf, bool setting);
1477 	int			(*ndo_set_vf_trust)(struct net_device *dev,
1478 						    int vf, bool setting);
1479 	int			(*ndo_get_vf_config)(struct net_device *dev,
1480 						     int vf,
1481 						     struct ifla_vf_info *ivf);
1482 	int			(*ndo_set_vf_link_state)(struct net_device *dev,
1483 							 int vf, int link_state);
1484 	int			(*ndo_get_vf_stats)(struct net_device *dev,
1485 						    int vf,
1486 						    struct ifla_vf_stats
1487 						    *vf_stats);
1488 	int			(*ndo_set_vf_port)(struct net_device *dev,
1489 						   int vf,
1490 						   struct nlattr *port[]);
1491 	int			(*ndo_get_vf_port)(struct net_device *dev,
1492 						   int vf, struct sk_buff *skb);
1493 	int			(*ndo_get_vf_guid)(struct net_device *dev,
1494 						   int vf,
1495 						   struct ifla_vf_guid *node_guid,
1496 						   struct ifla_vf_guid *port_guid);
1497 	int			(*ndo_set_vf_guid)(struct net_device *dev,
1498 						   int vf, u64 guid,
1499 						   int guid_type);
1500 	int			(*ndo_set_vf_rss_query_en)(
1501 						   struct net_device *dev,
1502 						   int vf, bool setting);
1503 	int			(*ndo_setup_tc)(struct net_device *dev,
1504 						enum tc_setup_type type,
1505 						void *type_data);
1506 #if IS_ENABLED(CONFIG_FCOE)
1507 	int			(*ndo_fcoe_enable)(struct net_device *dev);
1508 	int			(*ndo_fcoe_disable)(struct net_device *dev);
1509 	int			(*ndo_fcoe_ddp_setup)(struct net_device *dev,
1510 						      u16 xid,
1511 						      struct scatterlist *sgl,
1512 						      unsigned int sgc);
1513 	int			(*ndo_fcoe_ddp_done)(struct net_device *dev,
1514 						     u16 xid);
1515 	int			(*ndo_fcoe_ddp_target)(struct net_device *dev,
1516 						       u16 xid,
1517 						       struct scatterlist *sgl,
1518 						       unsigned int sgc);
1519 	int			(*ndo_fcoe_get_hbainfo)(struct net_device *dev,
1520 							struct netdev_fcoe_hbainfo *hbainfo);
1521 #endif
1522 
1523 #if IS_ENABLED(CONFIG_LIBFCOE)
1524 #define NETDEV_FCOE_WWNN 0
1525 #define NETDEV_FCOE_WWPN 1
1526 	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
1527 						    u64 *wwn, int type);
1528 #endif
1529 
1530 #ifdef CONFIG_RFS_ACCEL
1531 	int			(*ndo_rx_flow_steer)(struct net_device *dev,
1532 						     const struct sk_buff *skb,
1533 						     u16 rxq_index,
1534 						     u32 flow_id);
1535 #endif
1536 	int			(*ndo_add_slave)(struct net_device *dev,
1537 						 struct net_device *slave_dev,
1538 						 struct netlink_ext_ack *extack);
1539 	int			(*ndo_del_slave)(struct net_device *dev,
1540 						 struct net_device *slave_dev);
1541 	struct net_device*	(*ndo_get_xmit_slave)(struct net_device *dev,
1542 						      struct sk_buff *skb,
1543 						      bool all_slaves);
1544 	struct net_device*	(*ndo_sk_get_lower_dev)(struct net_device *dev,
1545 							struct sock *sk);
1546 	netdev_features_t	(*ndo_fix_features)(struct net_device *dev,
1547 						    netdev_features_t features);
1548 	int			(*ndo_set_features)(struct net_device *dev,
1549 						    netdev_features_t features);
1550 	int			(*ndo_neigh_construct)(struct net_device *dev,
1551 						       struct neighbour *n);
1552 	void			(*ndo_neigh_destroy)(struct net_device *dev,
1553 						     struct neighbour *n);
1554 
1555 	int			(*ndo_fdb_add)(struct ndmsg *ndm,
1556 					       struct nlattr *tb[],
1557 					       struct net_device *dev,
1558 					       const unsigned char *addr,
1559 					       u16 vid,
1560 					       u16 flags,
1561 					       struct netlink_ext_ack *extack);
1562 	int			(*ndo_fdb_del)(struct ndmsg *ndm,
1563 					       struct nlattr *tb[],
1564 					       struct net_device *dev,
1565 					       const unsigned char *addr,
1566 					       u16 vid, struct netlink_ext_ack *extack);
1567 	int			(*ndo_fdb_del_bulk)(struct ndmsg *ndm,
1568 						    struct nlattr *tb[],
1569 						    struct net_device *dev,
1570 						    u16 vid,
1571 						    struct netlink_ext_ack *extack);
1572 	int			(*ndo_fdb_dump)(struct sk_buff *skb,
1573 						struct netlink_callback *cb,
1574 						struct net_device *dev,
1575 						struct net_device *filter_dev,
1576 						int *idx);
1577 	int			(*ndo_fdb_get)(struct sk_buff *skb,
1578 					       struct nlattr *tb[],
1579 					       struct net_device *dev,
1580 					       const unsigned char *addr,
1581 					       u16 vid, u32 portid, u32 seq,
1582 					       struct netlink_ext_ack *extack);
1583 	int			(*ndo_mdb_add)(struct net_device *dev,
1584 					       struct nlattr *tb[],
1585 					       u16 nlmsg_flags,
1586 					       struct netlink_ext_ack *extack);
1587 	int			(*ndo_mdb_del)(struct net_device *dev,
1588 					       struct nlattr *tb[],
1589 					       struct netlink_ext_ack *extack);
1590 	int			(*ndo_mdb_dump)(struct net_device *dev,
1591 						struct sk_buff *skb,
1592 						struct netlink_callback *cb);
1593 	int			(*ndo_bridge_setlink)(struct net_device *dev,
1594 						      struct nlmsghdr *nlh,
1595 						      u16 flags,
1596 						      struct netlink_ext_ack *extack);
1597 	int			(*ndo_bridge_getlink)(struct sk_buff *skb,
1598 						      u32 pid, u32 seq,
1599 						      struct net_device *dev,
1600 						      u32 filter_mask,
1601 						      int nlflags);
1602 	int			(*ndo_bridge_dellink)(struct net_device *dev,
1603 						      struct nlmsghdr *nlh,
1604 						      u16 flags);
1605 	int			(*ndo_change_carrier)(struct net_device *dev,
1606 						      bool new_carrier);
1607 	int			(*ndo_get_phys_port_id)(struct net_device *dev,
1608 							struct netdev_phys_item_id *ppid);
1609 	int			(*ndo_get_port_parent_id)(struct net_device *dev,
1610 							  struct netdev_phys_item_id *ppid);
1611 	int			(*ndo_get_phys_port_name)(struct net_device *dev,
1612 							  char *name, size_t len);
1613 	void*			(*ndo_dfwd_add_station)(struct net_device *pdev,
1614 							struct net_device *dev);
1615 	void			(*ndo_dfwd_del_station)(struct net_device *pdev,
1616 							void *priv);
1617 
1618 	int			(*ndo_set_tx_maxrate)(struct net_device *dev,
1619 						      int queue_index,
1620 						      u32 maxrate);
1621 	int			(*ndo_get_iflink)(const struct net_device *dev);
1622 	int			(*ndo_fill_metadata_dst)(struct net_device *dev,
1623 						       struct sk_buff *skb);
1624 	void			(*ndo_set_rx_headroom)(struct net_device *dev,
1625 						       int needed_headroom);
1626 	int			(*ndo_bpf)(struct net_device *dev,
1627 					   struct netdev_bpf *bpf);
1628 	int			(*ndo_xdp_xmit)(struct net_device *dev, int n,
1629 						struct xdp_frame **xdp,
1630 						u32 flags);
1631 	struct net_device *	(*ndo_xdp_get_xmit_slave)(struct net_device *dev,
1632 							  struct xdp_buff *xdp);
1633 	int			(*ndo_xsk_wakeup)(struct net_device *dev,
1634 						  u32 queue_id, u32 flags);
1635 	int			(*ndo_tunnel_ctl)(struct net_device *dev,
1636 						  struct ip_tunnel_parm *p, int cmd);
1637 	struct net_device *	(*ndo_get_peer_dev)(struct net_device *dev);
1638 	int                     (*ndo_fill_forward_path)(struct net_device_path_ctx *ctx,
1639                                                          struct net_device_path *path);
1640 	ktime_t			(*ndo_get_tstamp)(struct net_device *dev,
1641 						  const struct skb_shared_hwtstamps *hwtstamps,
1642 						  bool cycles);
1643 	int			(*ndo_hwtstamp_get)(struct net_device *dev,
1644 						    struct kernel_hwtstamp_config *kernel_config);
1645 	int			(*ndo_hwtstamp_set)(struct net_device *dev,
1646 						    struct kernel_hwtstamp_config *kernel_config,
1647 						    struct netlink_ext_ack *extack);
1648 };
1649 
1650 /**
1651  * enum netdev_priv_flags - &struct net_device priv_flags
1652  *
1653  * These are the &struct net_device, they are only set internally
1654  * by drivers and used in the kernel. These flags are invisible to
1655  * userspace; this means that the order of these flags can change
1656  * during any kernel release.
1657  *
1658  * You should have a pretty good reason to be extending these flags.
1659  *
1660  * @IFF_802_1Q_VLAN: 802.1Q VLAN device
1661  * @IFF_EBRIDGE: Ethernet bridging device
1662  * @IFF_BONDING: bonding master or slave
1663  * @IFF_ISATAP: ISATAP interface (RFC4214)
1664  * @IFF_WAN_HDLC: WAN HDLC device
1665  * @IFF_XMIT_DST_RELEASE: dev_hard_start_xmit() is allowed to
1666  *	release skb->dst
1667  * @IFF_DONT_BRIDGE: disallow bridging this ether dev
1668  * @IFF_DISABLE_NETPOLL: disable netpoll at run-time
1669  * @IFF_MACVLAN_PORT: device used as macvlan port
1670  * @IFF_BRIDGE_PORT: device used as bridge port
1671  * @IFF_OVS_DATAPATH: device used as Open vSwitch datapath port
1672  * @IFF_TX_SKB_SHARING: The interface supports sharing skbs on transmit
1673  * @IFF_UNICAST_FLT: Supports unicast filtering
1674  * @IFF_TEAM_PORT: device used as team port
1675  * @IFF_SUPP_NOFCS: device supports sending custom FCS
1676  * @IFF_LIVE_ADDR_CHANGE: device supports hardware address
1677  *	change when it's running
1678  * @IFF_MACVLAN: Macvlan device
1679  * @IFF_XMIT_DST_RELEASE_PERM: IFF_XMIT_DST_RELEASE not taking into account
1680  *	underlying stacked devices
1681  * @IFF_L3MDEV_MASTER: device is an L3 master device
1682  * @IFF_NO_QUEUE: device can run without qdisc attached
1683  * @IFF_OPENVSWITCH: device is a Open vSwitch master
1684  * @IFF_L3MDEV_SLAVE: device is enslaved to an L3 master device
1685  * @IFF_TEAM: device is a team device
1686  * @IFF_RXFH_CONFIGURED: device has had Rx Flow indirection table configured
1687  * @IFF_PHONY_HEADROOM: the headroom value is controlled by an external
1688  *	entity (i.e. the master device for bridged veth)
1689  * @IFF_MACSEC: device is a MACsec device
1690  * @IFF_NO_RX_HANDLER: device doesn't support the rx_handler hook
1691  * @IFF_FAILOVER: device is a failover master device
1692  * @IFF_FAILOVER_SLAVE: device is lower dev of a failover master device
1693  * @IFF_L3MDEV_RX_HANDLER: only invoke the rx handler of L3 master device
1694  * @IFF_NO_ADDRCONF: prevent ipv6 addrconf
1695  * @IFF_TX_SKB_NO_LINEAR: device/driver is capable of xmitting frames with
1696  *	skb_headlen(skb) == 0 (data starts from frag0)
1697  * @IFF_CHANGE_PROTO_DOWN: device supports setting carrier via IFLA_PROTO_DOWN
1698  * @IFF_SEE_ALL_HWTSTAMP_REQUESTS: device wants to see calls to
1699  *	ndo_hwtstamp_set() for all timestamp requests regardless of source,
1700  *	even if those aren't HWTSTAMP_SOURCE_NETDEV.
1701  */
1702 enum netdev_priv_flags {
1703 	IFF_802_1Q_VLAN			= 1<<0,
1704 	IFF_EBRIDGE			= 1<<1,
1705 	IFF_BONDING			= 1<<2,
1706 	IFF_ISATAP			= 1<<3,
1707 	IFF_WAN_HDLC			= 1<<4,
1708 	IFF_XMIT_DST_RELEASE		= 1<<5,
1709 	IFF_DONT_BRIDGE			= 1<<6,
1710 	IFF_DISABLE_NETPOLL		= 1<<7,
1711 	IFF_MACVLAN_PORT		= 1<<8,
1712 	IFF_BRIDGE_PORT			= 1<<9,
1713 	IFF_OVS_DATAPATH		= 1<<10,
1714 	IFF_TX_SKB_SHARING		= 1<<11,
1715 	IFF_UNICAST_FLT			= 1<<12,
1716 	IFF_TEAM_PORT			= 1<<13,
1717 	IFF_SUPP_NOFCS			= 1<<14,
1718 	IFF_LIVE_ADDR_CHANGE		= 1<<15,
1719 	IFF_MACVLAN			= 1<<16,
1720 	IFF_XMIT_DST_RELEASE_PERM	= 1<<17,
1721 	IFF_L3MDEV_MASTER		= 1<<18,
1722 	IFF_NO_QUEUE			= 1<<19,
1723 	IFF_OPENVSWITCH			= 1<<20,
1724 	IFF_L3MDEV_SLAVE		= 1<<21,
1725 	IFF_TEAM			= 1<<22,
1726 	IFF_RXFH_CONFIGURED		= 1<<23,
1727 	IFF_PHONY_HEADROOM		= 1<<24,
1728 	IFF_MACSEC			= 1<<25,
1729 	IFF_NO_RX_HANDLER		= 1<<26,
1730 	IFF_FAILOVER			= 1<<27,
1731 	IFF_FAILOVER_SLAVE		= 1<<28,
1732 	IFF_L3MDEV_RX_HANDLER		= 1<<29,
1733 	IFF_NO_ADDRCONF			= BIT_ULL(30),
1734 	IFF_TX_SKB_NO_LINEAR		= BIT_ULL(31),
1735 	IFF_CHANGE_PROTO_DOWN		= BIT_ULL(32),
1736 	IFF_SEE_ALL_HWTSTAMP_REQUESTS	= BIT_ULL(33),
1737 };
1738 
1739 #define IFF_802_1Q_VLAN			IFF_802_1Q_VLAN
1740 #define IFF_EBRIDGE			IFF_EBRIDGE
1741 #define IFF_BONDING			IFF_BONDING
1742 #define IFF_ISATAP			IFF_ISATAP
1743 #define IFF_WAN_HDLC			IFF_WAN_HDLC
1744 #define IFF_XMIT_DST_RELEASE		IFF_XMIT_DST_RELEASE
1745 #define IFF_DONT_BRIDGE			IFF_DONT_BRIDGE
1746 #define IFF_DISABLE_NETPOLL		IFF_DISABLE_NETPOLL
1747 #define IFF_MACVLAN_PORT		IFF_MACVLAN_PORT
1748 #define IFF_BRIDGE_PORT			IFF_BRIDGE_PORT
1749 #define IFF_OVS_DATAPATH		IFF_OVS_DATAPATH
1750 #define IFF_TX_SKB_SHARING		IFF_TX_SKB_SHARING
1751 #define IFF_UNICAST_FLT			IFF_UNICAST_FLT
1752 #define IFF_TEAM_PORT			IFF_TEAM_PORT
1753 #define IFF_SUPP_NOFCS			IFF_SUPP_NOFCS
1754 #define IFF_LIVE_ADDR_CHANGE		IFF_LIVE_ADDR_CHANGE
1755 #define IFF_MACVLAN			IFF_MACVLAN
1756 #define IFF_XMIT_DST_RELEASE_PERM	IFF_XMIT_DST_RELEASE_PERM
1757 #define IFF_L3MDEV_MASTER		IFF_L3MDEV_MASTER
1758 #define IFF_NO_QUEUE			IFF_NO_QUEUE
1759 #define IFF_OPENVSWITCH			IFF_OPENVSWITCH
1760 #define IFF_L3MDEV_SLAVE		IFF_L3MDEV_SLAVE
1761 #define IFF_TEAM			IFF_TEAM
1762 #define IFF_RXFH_CONFIGURED		IFF_RXFH_CONFIGURED
1763 #define IFF_PHONY_HEADROOM		IFF_PHONY_HEADROOM
1764 #define IFF_MACSEC			IFF_MACSEC
1765 #define IFF_NO_RX_HANDLER		IFF_NO_RX_HANDLER
1766 #define IFF_FAILOVER			IFF_FAILOVER
1767 #define IFF_FAILOVER_SLAVE		IFF_FAILOVER_SLAVE
1768 #define IFF_L3MDEV_RX_HANDLER		IFF_L3MDEV_RX_HANDLER
1769 #define IFF_TX_SKB_NO_LINEAR		IFF_TX_SKB_NO_LINEAR
1770 
1771 /* Specifies the type of the struct net_device::ml_priv pointer */
1772 enum netdev_ml_priv_type {
1773 	ML_PRIV_NONE,
1774 	ML_PRIV_CAN,
1775 };
1776 
1777 enum netdev_stat_type {
1778 	NETDEV_PCPU_STAT_NONE,
1779 	NETDEV_PCPU_STAT_LSTATS, /* struct pcpu_lstats */
1780 	NETDEV_PCPU_STAT_TSTATS, /* struct pcpu_sw_netstats */
1781 	NETDEV_PCPU_STAT_DSTATS, /* struct pcpu_dstats */
1782 };
1783 
1784 /**
1785  *	struct net_device - The DEVICE structure.
1786  *
1787  *	Actually, this whole structure is a big mistake.  It mixes I/O
1788  *	data with strictly "high-level" data, and it has to know about
1789  *	almost every data structure used in the INET module.
1790  *
1791  *	@name:	This is the first field of the "visible" part of this structure
1792  *		(i.e. as seen by users in the "Space.c" file).  It is the name
1793  *		of the interface.
1794  *
1795  *	@name_node:	Name hashlist node
1796  *	@ifalias:	SNMP alias
1797  *	@mem_end:	Shared memory end
1798  *	@mem_start:	Shared memory start
1799  *	@base_addr:	Device I/O address
1800  *	@irq:		Device IRQ number
1801  *
1802  *	@state:		Generic network queuing layer state, see netdev_state_t
1803  *	@dev_list:	The global list of network devices
1804  *	@napi_list:	List entry used for polling NAPI devices
1805  *	@unreg_list:	List entry  when we are unregistering the
1806  *			device; see the function unregister_netdev
1807  *	@close_list:	List entry used when we are closing the device
1808  *	@ptype_all:     Device-specific packet handlers for all protocols
1809  *	@ptype_specific: Device-specific, protocol-specific packet handlers
1810  *
1811  *	@adj_list:	Directly linked devices, like slaves for bonding
1812  *	@features:	Currently active device features
1813  *	@hw_features:	User-changeable features
1814  *
1815  *	@wanted_features:	User-requested features
1816  *	@vlan_features:		Mask of features inheritable by VLAN devices
1817  *
1818  *	@hw_enc_features:	Mask of features inherited by encapsulating devices
1819  *				This field indicates what encapsulation
1820  *				offloads the hardware is capable of doing,
1821  *				and drivers will need to set them appropriately.
1822  *
1823  *	@mpls_features:	Mask of features inheritable by MPLS
1824  *	@gso_partial_features: value(s) from NETIF_F_GSO\*
1825  *
1826  *	@ifindex:	interface index
1827  *	@group:		The group the device belongs to
1828  *
1829  *	@stats:		Statistics struct, which was left as a legacy, use
1830  *			rtnl_link_stats64 instead
1831  *
1832  *	@core_stats:	core networking counters,
1833  *			do not use this in drivers
1834  *	@carrier_up_count:	Number of times the carrier has been up
1835  *	@carrier_down_count:	Number of times the carrier has been down
1836  *
1837  *	@wireless_handlers:	List of functions to handle Wireless Extensions,
1838  *				instead of ioctl,
1839  *				see <net/iw_handler.h> for details.
1840  *	@wireless_data:	Instance data managed by the core of wireless extensions
1841  *
1842  *	@netdev_ops:	Includes several pointers to callbacks,
1843  *			if one wants to override the ndo_*() functions
1844  *	@xdp_metadata_ops:	Includes pointers to XDP metadata callbacks.
1845  *	@ethtool_ops:	Management operations
1846  *	@l3mdev_ops:	Layer 3 master device operations
1847  *	@ndisc_ops:	Includes callbacks for different IPv6 neighbour
1848  *			discovery handling. Necessary for e.g. 6LoWPAN.
1849  *	@xfrmdev_ops:	Transformation offload operations
1850  *	@tlsdev_ops:	Transport Layer Security offload operations
1851  *	@header_ops:	Includes callbacks for creating,parsing,caching,etc
1852  *			of Layer 2 headers.
1853  *
1854  *	@flags:		Interface flags (a la BSD)
1855  *	@xdp_features:	XDP capability supported by the device
1856  *	@priv_flags:	Like 'flags' but invisible to userspace,
1857  *			see if.h for the definitions
1858  *	@gflags:	Global flags ( kept as legacy )
1859  *	@padded:	How much padding added by alloc_netdev()
1860  *	@operstate:	RFC2863 operstate
1861  *	@link_mode:	Mapping policy to operstate
1862  *	@if_port:	Selectable AUI, TP, ...
1863  *	@dma:		DMA channel
1864  *	@mtu:		Interface MTU value
1865  *	@min_mtu:	Interface Minimum MTU value
1866  *	@max_mtu:	Interface Maximum MTU value
1867  *	@type:		Interface hardware type
1868  *	@hard_header_len: Maximum hardware header length.
1869  *	@min_header_len:  Minimum hardware header length
1870  *
1871  *	@needed_headroom: Extra headroom the hardware may need, but not in all
1872  *			  cases can this be guaranteed
1873  *	@needed_tailroom: Extra tailroom the hardware may need, but not in all
1874  *			  cases can this be guaranteed. Some cases also use
1875  *			  LL_MAX_HEADER instead to allocate the skb
1876  *
1877  *	interface address info:
1878  *
1879  * 	@perm_addr:		Permanent hw address
1880  * 	@addr_assign_type:	Hw address assignment type
1881  * 	@addr_len:		Hardware address length
1882  *	@upper_level:		Maximum depth level of upper devices.
1883  *	@lower_level:		Maximum depth level of lower devices.
1884  *	@neigh_priv_len:	Used in neigh_alloc()
1885  * 	@dev_id:		Used to differentiate devices that share
1886  * 				the same link layer address
1887  * 	@dev_port:		Used to differentiate devices that share
1888  * 				the same function
1889  *	@addr_list_lock:	XXX: need comments on this one
1890  *	@name_assign_type:	network interface name assignment type
1891  *	@uc_promisc:		Counter that indicates promiscuous mode
1892  *				has been enabled due to the need to listen to
1893  *				additional unicast addresses in a device that
1894  *				does not implement ndo_set_rx_mode()
1895  *	@uc:			unicast mac addresses
1896  *	@mc:			multicast mac addresses
1897  *	@dev_addrs:		list of device hw addresses
1898  *	@queues_kset:		Group of all Kobjects in the Tx and RX queues
1899  *	@promiscuity:		Number of times the NIC is told to work in
1900  *				promiscuous mode; if it becomes 0 the NIC will
1901  *				exit promiscuous mode
1902  *	@allmulti:		Counter, enables or disables allmulticast mode
1903  *
1904  *	@vlan_info:	VLAN info
1905  *	@dsa_ptr:	dsa specific data
1906  *	@tipc_ptr:	TIPC specific data
1907  *	@atalk_ptr:	AppleTalk link
1908  *	@ip_ptr:	IPv4 specific data
1909  *	@ip6_ptr:	IPv6 specific data
1910  *	@ax25_ptr:	AX.25 specific data
1911  *	@ieee80211_ptr:	IEEE 802.11 specific data, assign before registering
1912  *	@ieee802154_ptr: IEEE 802.15.4 low-rate Wireless Personal Area Network
1913  *			 device struct
1914  *	@mpls_ptr:	mpls_dev struct pointer
1915  *	@mctp_ptr:	MCTP specific data
1916  *
1917  *	@dev_addr:	Hw address (before bcast,
1918  *			because most packets are unicast)
1919  *
1920  *	@_rx:			Array of RX queues
1921  *	@num_rx_queues:		Number of RX queues
1922  *				allocated at register_netdev() time
1923  *	@real_num_rx_queues: 	Number of RX queues currently active in device
1924  *	@xdp_prog:		XDP sockets filter program pointer
1925  *	@gro_flush_timeout:	timeout for GRO layer in NAPI
1926  *	@napi_defer_hard_irqs:	If not zero, provides a counter that would
1927  *				allow to avoid NIC hard IRQ, on busy queues.
1928  *
1929  *	@rx_handler:		handler for received packets
1930  *	@rx_handler_data: 	XXX: need comments on this one
1931  *	@tcx_ingress:		BPF & clsact qdisc specific data for ingress processing
1932  *	@ingress_queue:		XXX: need comments on this one
1933  *	@nf_hooks_ingress:	netfilter hooks executed for ingress packets
1934  *	@broadcast:		hw bcast address
1935  *
1936  *	@rx_cpu_rmap:	CPU reverse-mapping for RX completion interrupts,
1937  *			indexed by RX queue number. Assigned by driver.
1938  *			This must only be set if the ndo_rx_flow_steer
1939  *			operation is defined
1940  *	@index_hlist:		Device index hash chain
1941  *
1942  *	@_tx:			Array of TX queues
1943  *	@num_tx_queues:		Number of TX queues allocated at alloc_netdev_mq() time
1944  *	@real_num_tx_queues: 	Number of TX queues currently active in device
1945  *	@qdisc:			Root qdisc from userspace point of view
1946  *	@tx_queue_len:		Max frames per queue allowed
1947  *	@tx_global_lock: 	XXX: need comments on this one
1948  *	@xdp_bulkq:		XDP device bulk queue
1949  *	@xps_maps:		all CPUs/RXQs maps for XPS device
1950  *
1951  *	@xps_maps:	XXX: need comments on this one
1952  *	@tcx_egress:		BPF & clsact qdisc specific data for egress processing
1953  *	@nf_hooks_egress:	netfilter hooks executed for egress packets
1954  *	@qdisc_hash:		qdisc hash table
1955  *	@watchdog_timeo:	Represents the timeout that is used by
1956  *				the watchdog (see dev_watchdog())
1957  *	@watchdog_timer:	List of timers
1958  *
1959  *	@proto_down_reason:	reason a netdev interface is held down
1960  *	@pcpu_refcnt:		Number of references to this device
1961  *	@dev_refcnt:		Number of references to this device
1962  *	@refcnt_tracker:	Tracker directory for tracked references to this device
1963  *	@todo_list:		Delayed register/unregister
1964  *	@link_watch_list:	XXX: need comments on this one
1965  *
1966  *	@reg_state:		Register/unregister state machine
1967  *	@dismantle:		Device is going to be freed
1968  *	@rtnl_link_state:	This enum represents the phases of creating
1969  *				a new link
1970  *
1971  *	@needs_free_netdev:	Should unregister perform free_netdev?
1972  *	@priv_destructor:	Called from unregister
1973  *	@npinfo:		XXX: need comments on this one
1974  * 	@nd_net:		Network namespace this network device is inside
1975  *
1976  * 	@ml_priv:	Mid-layer private
1977  *	@ml_priv_type:  Mid-layer private type
1978  *
1979  *	@pcpu_stat_type:	Type of device statistics which the core should
1980  *				allocate/free: none, lstats, tstats, dstats. none
1981  *				means the driver is handling statistics allocation/
1982  *				freeing internally.
1983  *	@lstats:		Loopback statistics: packets, bytes
1984  *	@tstats:		Tunnel statistics: RX/TX packets, RX/TX bytes
1985  *	@dstats:		Dummy statistics: RX/TX/drop packets, RX/TX bytes
1986  *
1987  *	@garp_port:	GARP
1988  *	@mrp_port:	MRP
1989  *
1990  *	@dm_private:	Drop monitor private
1991  *
1992  *	@dev:		Class/net/name entry
1993  *	@sysfs_groups:	Space for optional device, statistics and wireless
1994  *			sysfs groups
1995  *
1996  *	@sysfs_rx_queue_group:	Space for optional per-rx queue attributes
1997  *	@rtnl_link_ops:	Rtnl_link_ops
1998  *
1999  *	@gso_max_size:	Maximum size of generic segmentation offload
2000  *	@tso_max_size:	Device (as in HW) limit on the max TSO request size
2001  *	@gso_max_segs:	Maximum number of segments that can be passed to the
2002  *			NIC for GSO
2003  *	@tso_max_segs:	Device (as in HW) limit on the max TSO segment count
2004  * 	@gso_ipv4_max_size:	Maximum size of generic segmentation offload,
2005  * 				for IPv4.
2006  *
2007  *	@dcbnl_ops:	Data Center Bridging netlink ops
2008  *	@num_tc:	Number of traffic classes in the net device
2009  *	@tc_to_txq:	XXX: need comments on this one
2010  *	@prio_tc_map:	XXX: need comments on this one
2011  *
2012  *	@fcoe_ddp_xid:	Max exchange id for FCoE LRO by ddp
2013  *
2014  *	@priomap:	XXX: need comments on this one
2015  *	@phydev:	Physical device may attach itself
2016  *			for hardware timestamping
2017  *	@sfp_bus:	attached &struct sfp_bus structure.
2018  *
2019  *	@qdisc_tx_busylock: lockdep class annotating Qdisc->busylock spinlock
2020  *
2021  *	@proto_down:	protocol port state information can be sent to the
2022  *			switch driver and used to set the phys state of the
2023  *			switch port.
2024  *
2025  *	@wol_enabled:	Wake-on-LAN is enabled
2026  *
2027  *	@threaded:	napi threaded mode is enabled
2028  *
2029  *	@net_notifier_list:	List of per-net netdev notifier block
2030  *				that follow this device when it is moved
2031  *				to another network namespace.
2032  *
2033  *	@macsec_ops:    MACsec offloading ops
2034  *
2035  *	@udp_tunnel_nic_info:	static structure describing the UDP tunnel
2036  *				offload capabilities of the device
2037  *	@udp_tunnel_nic:	UDP tunnel offload state
2038  *	@xdp_state:		stores info on attached XDP BPF programs
2039  *
2040  *	@nested_level:	Used as a parameter of spin_lock_nested() of
2041  *			dev->addr_list_lock.
2042  *	@unlink_list:	As netif_addr_lock() can be called recursively,
2043  *			keep a list of interfaces to be deleted.
2044  *	@gro_max_size:	Maximum size of aggregated packet in generic
2045  *			receive offload (GRO)
2046  * 	@gro_ipv4_max_size:	Maximum size of aggregated packet in generic
2047  * 				receive offload (GRO), for IPv4.
2048  *	@xdp_zc_max_segs:	Maximum number of segments supported by AF_XDP
2049  *				zero copy driver
2050  *
2051  *	@dev_addr_shadow:	Copy of @dev_addr to catch direct writes.
2052  *	@linkwatch_dev_tracker:	refcount tracker used by linkwatch.
2053  *	@watchdog_dev_tracker:	refcount tracker used by watchdog.
2054  *	@dev_registered_tracker:	tracker for reference held while
2055  *					registered
2056  *	@offload_xstats_l3:	L3 HW stats for this netdevice.
2057  *
2058  *	@devlink_port:	Pointer to related devlink port structure.
2059  *			Assigned by a driver before netdev registration using
2060  *			SET_NETDEV_DEVLINK_PORT macro. This pointer is static
2061  *			during the time netdevice is registered.
2062  *
2063  *	FIXME: cleanup struct net_device such that network protocol info
2064  *	moves out.
2065  */
2066 
2067 struct net_device {
2068 	char			name[IFNAMSIZ];
2069 	struct netdev_name_node	*name_node;
2070 	struct dev_ifalias	__rcu *ifalias;
2071 	/*
2072 	 *	I/O specific fields
2073 	 *	FIXME: Merge these and struct ifmap into one
2074 	 */
2075 	unsigned long		mem_end;
2076 	unsigned long		mem_start;
2077 	unsigned long		base_addr;
2078 
2079 	/*
2080 	 *	Some hardware also needs these fields (state,dev_list,
2081 	 *	napi_list,unreg_list,close_list) but they are not
2082 	 *	part of the usual set specified in Space.c.
2083 	 */
2084 
2085 	unsigned long		state;
2086 
2087 	struct list_head	dev_list;
2088 	struct list_head	napi_list;
2089 	struct list_head	unreg_list;
2090 	struct list_head	close_list;
2091 	struct list_head	ptype_all;
2092 	struct list_head	ptype_specific;
2093 
2094 	struct {
2095 		struct list_head upper;
2096 		struct list_head lower;
2097 	} adj_list;
2098 
2099 	/* Read-mostly cache-line for fast-path access */
2100 	unsigned int		flags;
2101 	xdp_features_t		xdp_features;
2102 	unsigned long long	priv_flags;
2103 	const struct net_device_ops *netdev_ops;
2104 	const struct xdp_metadata_ops *xdp_metadata_ops;
2105 	int			ifindex;
2106 	unsigned short		gflags;
2107 	unsigned short		hard_header_len;
2108 
2109 	/* Note : dev->mtu is often read without holding a lock.
2110 	 * Writers usually hold RTNL.
2111 	 * It is recommended to use READ_ONCE() to annotate the reads,
2112 	 * and to use WRITE_ONCE() to annotate the writes.
2113 	 */
2114 	unsigned int		mtu;
2115 	unsigned short		needed_headroom;
2116 	unsigned short		needed_tailroom;
2117 
2118 	netdev_features_t	features;
2119 	netdev_features_t	hw_features;
2120 	netdev_features_t	wanted_features;
2121 	netdev_features_t	vlan_features;
2122 	netdev_features_t	hw_enc_features;
2123 	netdev_features_t	mpls_features;
2124 	netdev_features_t	gso_partial_features;
2125 
2126 	unsigned int		min_mtu;
2127 	unsigned int		max_mtu;
2128 	unsigned short		type;
2129 	unsigned char		min_header_len;
2130 	unsigned char		name_assign_type;
2131 
2132 	int			group;
2133 
2134 	struct net_device_stats	stats; /* not used by modern drivers */
2135 
2136 	struct net_device_core_stats __percpu *core_stats;
2137 
2138 	/* Stats to monitor link on/off, flapping */
2139 	atomic_t		carrier_up_count;
2140 	atomic_t		carrier_down_count;
2141 
2142 #ifdef CONFIG_WIRELESS_EXT
2143 	const struct iw_handler_def *wireless_handlers;
2144 	struct iw_public_data	*wireless_data;
2145 #endif
2146 	const struct ethtool_ops *ethtool_ops;
2147 #ifdef CONFIG_NET_L3_MASTER_DEV
2148 	const struct l3mdev_ops	*l3mdev_ops;
2149 #endif
2150 #if IS_ENABLED(CONFIG_IPV6)
2151 	const struct ndisc_ops *ndisc_ops;
2152 #endif
2153 
2154 #ifdef CONFIG_XFRM_OFFLOAD
2155 	const struct xfrmdev_ops *xfrmdev_ops;
2156 #endif
2157 
2158 #if IS_ENABLED(CONFIG_TLS_DEVICE)
2159 	const struct tlsdev_ops *tlsdev_ops;
2160 #endif
2161 
2162 	const struct header_ops *header_ops;
2163 
2164 	unsigned char		operstate;
2165 	unsigned char		link_mode;
2166 
2167 	unsigned char		if_port;
2168 	unsigned char		dma;
2169 
2170 	/* Interface address info. */
2171 	unsigned char		perm_addr[MAX_ADDR_LEN];
2172 	unsigned char		addr_assign_type;
2173 	unsigned char		addr_len;
2174 	unsigned char		upper_level;
2175 	unsigned char		lower_level;
2176 
2177 	unsigned short		neigh_priv_len;
2178 	unsigned short          dev_id;
2179 	unsigned short          dev_port;
2180 	unsigned short		padded;
2181 
2182 	spinlock_t		addr_list_lock;
2183 	int			irq;
2184 
2185 	struct netdev_hw_addr_list	uc;
2186 	struct netdev_hw_addr_list	mc;
2187 	struct netdev_hw_addr_list	dev_addrs;
2188 
2189 #ifdef CONFIG_SYSFS
2190 	struct kset		*queues_kset;
2191 #endif
2192 #ifdef CONFIG_LOCKDEP
2193 	struct list_head	unlink_list;
2194 #endif
2195 	unsigned int		promiscuity;
2196 	unsigned int		allmulti;
2197 	bool			uc_promisc;
2198 #ifdef CONFIG_LOCKDEP
2199 	unsigned char		nested_level;
2200 #endif
2201 
2202 
2203 	/* Protocol-specific pointers */
2204 
2205 	struct in_device __rcu	*ip_ptr;
2206 	struct inet6_dev __rcu	*ip6_ptr;
2207 #if IS_ENABLED(CONFIG_VLAN_8021Q)
2208 	struct vlan_info __rcu	*vlan_info;
2209 #endif
2210 #if IS_ENABLED(CONFIG_NET_DSA)
2211 	struct dsa_port		*dsa_ptr;
2212 #endif
2213 #if IS_ENABLED(CONFIG_TIPC)
2214 	struct tipc_bearer __rcu *tipc_ptr;
2215 #endif
2216 #if IS_ENABLED(CONFIG_ATALK)
2217 	void 			*atalk_ptr;
2218 #endif
2219 #if IS_ENABLED(CONFIG_AX25)
2220 	void			*ax25_ptr;
2221 #endif
2222 #if IS_ENABLED(CONFIG_CFG80211)
2223 	struct wireless_dev	*ieee80211_ptr;
2224 #endif
2225 #if IS_ENABLED(CONFIG_IEEE802154) || IS_ENABLED(CONFIG_6LOWPAN)
2226 	struct wpan_dev		*ieee802154_ptr;
2227 #endif
2228 #if IS_ENABLED(CONFIG_MPLS_ROUTING)
2229 	struct mpls_dev __rcu	*mpls_ptr;
2230 #endif
2231 #if IS_ENABLED(CONFIG_MCTP)
2232 	struct mctp_dev __rcu	*mctp_ptr;
2233 #endif
2234 
2235 /*
2236  * Cache lines mostly used on receive path (including eth_type_trans())
2237  */
2238 	/* Interface address info used in eth_type_trans() */
2239 	const unsigned char	*dev_addr;
2240 
2241 	struct netdev_rx_queue	*_rx;
2242 	unsigned int		num_rx_queues;
2243 	unsigned int		real_num_rx_queues;
2244 
2245 	struct bpf_prog __rcu	*xdp_prog;
2246 	unsigned long		gro_flush_timeout;
2247 	int			napi_defer_hard_irqs;
2248 #define GRO_LEGACY_MAX_SIZE	65536u
2249 /* TCP minimal MSS is 8 (TCP_MIN_GSO_SIZE),
2250  * and shinfo->gso_segs is a 16bit field.
2251  */
2252 #define GRO_MAX_SIZE		(8 * 65535u)
2253 	unsigned int		gro_max_size;
2254 	unsigned int		gro_ipv4_max_size;
2255 	unsigned int		xdp_zc_max_segs;
2256 	rx_handler_func_t __rcu	*rx_handler;
2257 	void __rcu		*rx_handler_data;
2258 #ifdef CONFIG_NET_XGRESS
2259 	struct bpf_mprog_entry __rcu *tcx_ingress;
2260 #endif
2261 	struct netdev_queue __rcu *ingress_queue;
2262 #ifdef CONFIG_NETFILTER_INGRESS
2263 	struct nf_hook_entries __rcu *nf_hooks_ingress;
2264 #endif
2265 
2266 	unsigned char		broadcast[MAX_ADDR_LEN];
2267 #ifdef CONFIG_RFS_ACCEL
2268 	struct cpu_rmap		*rx_cpu_rmap;
2269 #endif
2270 	struct hlist_node	index_hlist;
2271 
2272 /*
2273  * Cache lines mostly used on transmit path
2274  */
2275 	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
2276 	unsigned int		num_tx_queues;
2277 	unsigned int		real_num_tx_queues;
2278 	struct Qdisc __rcu	*qdisc;
2279 	unsigned int		tx_queue_len;
2280 	spinlock_t		tx_global_lock;
2281 
2282 	struct xdp_dev_bulk_queue __percpu *xdp_bulkq;
2283 
2284 #ifdef CONFIG_XPS
2285 	struct xps_dev_maps __rcu *xps_maps[XPS_MAPS_MAX];
2286 #endif
2287 #ifdef CONFIG_NET_XGRESS
2288 	struct bpf_mprog_entry __rcu *tcx_egress;
2289 #endif
2290 #ifdef CONFIG_NETFILTER_EGRESS
2291 	struct nf_hook_entries __rcu *nf_hooks_egress;
2292 #endif
2293 
2294 #ifdef CONFIG_NET_SCHED
2295 	DECLARE_HASHTABLE	(qdisc_hash, 4);
2296 #endif
2297 	/* These may be needed for future network-power-down code. */
2298 	struct timer_list	watchdog_timer;
2299 	int			watchdog_timeo;
2300 
2301 	u32                     proto_down_reason;
2302 
2303 	struct list_head	todo_list;
2304 
2305 #ifdef CONFIG_PCPU_DEV_REFCNT
2306 	int __percpu		*pcpu_refcnt;
2307 #else
2308 	refcount_t		dev_refcnt;
2309 #endif
2310 	struct ref_tracker_dir	refcnt_tracker;
2311 
2312 	struct list_head	link_watch_list;
2313 
2314 	enum { NETREG_UNINITIALIZED=0,
2315 	       NETREG_REGISTERED,	/* completed register_netdevice */
2316 	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
2317 	       NETREG_UNREGISTERED,	/* completed unregister todo */
2318 	       NETREG_RELEASED,		/* called free_netdev */
2319 	       NETREG_DUMMY,		/* dummy device for NAPI poll */
2320 	} reg_state:8;
2321 
2322 	bool dismantle;
2323 
2324 	enum {
2325 		RTNL_LINK_INITIALIZED,
2326 		RTNL_LINK_INITIALIZING,
2327 	} rtnl_link_state:16;
2328 
2329 	bool needs_free_netdev;
2330 	void (*priv_destructor)(struct net_device *dev);
2331 
2332 #ifdef CONFIG_NETPOLL
2333 	struct netpoll_info __rcu	*npinfo;
2334 #endif
2335 
2336 	possible_net_t			nd_net;
2337 
2338 	/* mid-layer private */
2339 	void				*ml_priv;
2340 	enum netdev_ml_priv_type	ml_priv_type;
2341 
2342 	enum netdev_stat_type		pcpu_stat_type:8;
2343 	union {
2344 		struct pcpu_lstats __percpu		*lstats;
2345 		struct pcpu_sw_netstats __percpu	*tstats;
2346 		struct pcpu_dstats __percpu		*dstats;
2347 	};
2348 
2349 #if IS_ENABLED(CONFIG_GARP)
2350 	struct garp_port __rcu	*garp_port;
2351 #endif
2352 #if IS_ENABLED(CONFIG_MRP)
2353 	struct mrp_port __rcu	*mrp_port;
2354 #endif
2355 #if IS_ENABLED(CONFIG_NET_DROP_MONITOR)
2356 	struct dm_hw_stat_delta __rcu *dm_private;
2357 #endif
2358 	struct device		dev;
2359 	const struct attribute_group *sysfs_groups[4];
2360 	const struct attribute_group *sysfs_rx_queue_group;
2361 
2362 	const struct rtnl_link_ops *rtnl_link_ops;
2363 
2364 	/* for setting kernel sock attribute on TCP connection setup */
2365 #define GSO_MAX_SEGS		65535u
2366 #define GSO_LEGACY_MAX_SIZE	65536u
2367 /* TCP minimal MSS is 8 (TCP_MIN_GSO_SIZE),
2368  * and shinfo->gso_segs is a 16bit field.
2369  */
2370 #define GSO_MAX_SIZE		(8 * GSO_MAX_SEGS)
2371 
2372 	unsigned int		gso_max_size;
2373 #define TSO_LEGACY_MAX_SIZE	65536
2374 #define TSO_MAX_SIZE		UINT_MAX
2375 	unsigned int		tso_max_size;
2376 	u16			gso_max_segs;
2377 #define TSO_MAX_SEGS		U16_MAX
2378 	u16			tso_max_segs;
2379 	unsigned int		gso_ipv4_max_size;
2380 
2381 #ifdef CONFIG_DCB
2382 	const struct dcbnl_rtnl_ops *dcbnl_ops;
2383 #endif
2384 	s16			num_tc;
2385 	struct netdev_tc_txq	tc_to_txq[TC_MAX_QUEUE];
2386 	u8			prio_tc_map[TC_BITMASK + 1];
2387 
2388 #if IS_ENABLED(CONFIG_FCOE)
2389 	unsigned int		fcoe_ddp_xid;
2390 #endif
2391 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
2392 	struct netprio_map __rcu *priomap;
2393 #endif
2394 	struct phy_device	*phydev;
2395 	struct sfp_bus		*sfp_bus;
2396 	struct lock_class_key	*qdisc_tx_busylock;
2397 	bool			proto_down;
2398 	unsigned		wol_enabled:1;
2399 	unsigned		threaded:1;
2400 
2401 	struct list_head	net_notifier_list;
2402 
2403 #if IS_ENABLED(CONFIG_MACSEC)
2404 	/* MACsec management functions */
2405 	const struct macsec_ops *macsec_ops;
2406 #endif
2407 	const struct udp_tunnel_nic_info	*udp_tunnel_nic_info;
2408 	struct udp_tunnel_nic	*udp_tunnel_nic;
2409 
2410 	/* protected by rtnl_lock */
2411 	struct bpf_xdp_entity	xdp_state[__MAX_XDP_MODE];
2412 
2413 	u8 dev_addr_shadow[MAX_ADDR_LEN];
2414 	netdevice_tracker	linkwatch_dev_tracker;
2415 	netdevice_tracker	watchdog_dev_tracker;
2416 	netdevice_tracker	dev_registered_tracker;
2417 	struct rtnl_hw_stats64	*offload_xstats_l3;
2418 
2419 	struct devlink_port	*devlink_port;
2420 };
2421 #define to_net_dev(d) container_of(d, struct net_device, dev)
2422 
2423 /*
2424  * Driver should use this to assign devlink port instance to a netdevice
2425  * before it registers the netdevice. Therefore devlink_port is static
2426  * during the netdev lifetime after it is registered.
2427  */
2428 #define SET_NETDEV_DEVLINK_PORT(dev, port)			\
2429 ({								\
2430 	WARN_ON((dev)->reg_state != NETREG_UNINITIALIZED);	\
2431 	((dev)->devlink_port = (port));				\
2432 })
2433 
netif_elide_gro(const struct net_device * dev)2434 static inline bool netif_elide_gro(const struct net_device *dev)
2435 {
2436 	if (!(dev->features & NETIF_F_GRO) || dev->xdp_prog)
2437 		return true;
2438 	return false;
2439 }
2440 
2441 #define	NETDEV_ALIGN		32
2442 
2443 static inline
netdev_get_prio_tc_map(const struct net_device * dev,u32 prio)2444 int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
2445 {
2446 	return dev->prio_tc_map[prio & TC_BITMASK];
2447 }
2448 
2449 static inline
netdev_set_prio_tc_map(struct net_device * dev,u8 prio,u8 tc)2450 int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc)
2451 {
2452 	if (tc >= dev->num_tc)
2453 		return -EINVAL;
2454 
2455 	dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK;
2456 	return 0;
2457 }
2458 
2459 int netdev_txq_to_tc(struct net_device *dev, unsigned int txq);
2460 void netdev_reset_tc(struct net_device *dev);
2461 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset);
2462 int netdev_set_num_tc(struct net_device *dev, u8 num_tc);
2463 
2464 static inline
netdev_get_num_tc(struct net_device * dev)2465 int netdev_get_num_tc(struct net_device *dev)
2466 {
2467 	return dev->num_tc;
2468 }
2469 
net_prefetch(void * p)2470 static inline void net_prefetch(void *p)
2471 {
2472 	prefetch(p);
2473 #if L1_CACHE_BYTES < 128
2474 	prefetch((u8 *)p + L1_CACHE_BYTES);
2475 #endif
2476 }
2477 
net_prefetchw(void * p)2478 static inline void net_prefetchw(void *p)
2479 {
2480 	prefetchw(p);
2481 #if L1_CACHE_BYTES < 128
2482 	prefetchw((u8 *)p + L1_CACHE_BYTES);
2483 #endif
2484 }
2485 
2486 void netdev_unbind_sb_channel(struct net_device *dev,
2487 			      struct net_device *sb_dev);
2488 int netdev_bind_sb_channel_queue(struct net_device *dev,
2489 				 struct net_device *sb_dev,
2490 				 u8 tc, u16 count, u16 offset);
2491 int netdev_set_sb_channel(struct net_device *dev, u16 channel);
netdev_get_sb_channel(struct net_device * dev)2492 static inline int netdev_get_sb_channel(struct net_device *dev)
2493 {
2494 	return max_t(int, -dev->num_tc, 0);
2495 }
2496 
2497 static inline
netdev_get_tx_queue(const struct net_device * dev,unsigned int index)2498 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
2499 					 unsigned int index)
2500 {
2501 	DEBUG_NET_WARN_ON_ONCE(index >= dev->num_tx_queues);
2502 	return &dev->_tx[index];
2503 }
2504 
skb_get_tx_queue(const struct net_device * dev,const struct sk_buff * skb)2505 static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev,
2506 						    const struct sk_buff *skb)
2507 {
2508 	return netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
2509 }
2510 
netdev_for_each_tx_queue(struct net_device * dev,void (* f)(struct net_device *,struct netdev_queue *,void *),void * arg)2511 static inline void netdev_for_each_tx_queue(struct net_device *dev,
2512 					    void (*f)(struct net_device *,
2513 						      struct netdev_queue *,
2514 						      void *),
2515 					    void *arg)
2516 {
2517 	unsigned int i;
2518 
2519 	for (i = 0; i < dev->num_tx_queues; i++)
2520 		f(dev, &dev->_tx[i], arg);
2521 }
2522 
2523 #define netdev_lockdep_set_classes(dev)				\
2524 {								\
2525 	static struct lock_class_key qdisc_tx_busylock_key;	\
2526 	static struct lock_class_key qdisc_xmit_lock_key;	\
2527 	static struct lock_class_key dev_addr_list_lock_key;	\
2528 	unsigned int i;						\
2529 								\
2530 	(dev)->qdisc_tx_busylock = &qdisc_tx_busylock_key;	\
2531 	lockdep_set_class(&(dev)->addr_list_lock,		\
2532 			  &dev_addr_list_lock_key);		\
2533 	for (i = 0; i < (dev)->num_tx_queues; i++)		\
2534 		lockdep_set_class(&(dev)->_tx[i]._xmit_lock,	\
2535 				  &qdisc_xmit_lock_key);	\
2536 }
2537 
2538 u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb,
2539 		     struct net_device *sb_dev);
2540 struct netdev_queue *netdev_core_pick_tx(struct net_device *dev,
2541 					 struct sk_buff *skb,
2542 					 struct net_device *sb_dev);
2543 
2544 /* returns the headroom that the master device needs to take in account
2545  * when forwarding to this dev
2546  */
netdev_get_fwd_headroom(struct net_device * dev)2547 static inline unsigned netdev_get_fwd_headroom(struct net_device *dev)
2548 {
2549 	return dev->priv_flags & IFF_PHONY_HEADROOM ? 0 : dev->needed_headroom;
2550 }
2551 
netdev_set_rx_headroom(struct net_device * dev,int new_hr)2552 static inline void netdev_set_rx_headroom(struct net_device *dev, int new_hr)
2553 {
2554 	if (dev->netdev_ops->ndo_set_rx_headroom)
2555 		dev->netdev_ops->ndo_set_rx_headroom(dev, new_hr);
2556 }
2557 
2558 /* set the device rx headroom to the dev's default */
netdev_reset_rx_headroom(struct net_device * dev)2559 static inline void netdev_reset_rx_headroom(struct net_device *dev)
2560 {
2561 	netdev_set_rx_headroom(dev, -1);
2562 }
2563 
netdev_get_ml_priv(struct net_device * dev,enum netdev_ml_priv_type type)2564 static inline void *netdev_get_ml_priv(struct net_device *dev,
2565 				       enum netdev_ml_priv_type type)
2566 {
2567 	if (dev->ml_priv_type != type)
2568 		return NULL;
2569 
2570 	return dev->ml_priv;
2571 }
2572 
netdev_set_ml_priv(struct net_device * dev,void * ml_priv,enum netdev_ml_priv_type type)2573 static inline void netdev_set_ml_priv(struct net_device *dev,
2574 				      void *ml_priv,
2575 				      enum netdev_ml_priv_type type)
2576 {
2577 	WARN(dev->ml_priv_type && dev->ml_priv_type != type,
2578 	     "Overwriting already set ml_priv_type (%u) with different ml_priv_type (%u)!\n",
2579 	     dev->ml_priv_type, type);
2580 	WARN(!dev->ml_priv_type && dev->ml_priv,
2581 	     "Overwriting already set ml_priv and ml_priv_type is ML_PRIV_NONE!\n");
2582 
2583 	dev->ml_priv = ml_priv;
2584 	dev->ml_priv_type = type;
2585 }
2586 
2587 /*
2588  * Net namespace inlines
2589  */
2590 static inline
dev_net(const struct net_device * dev)2591 struct net *dev_net(const struct net_device *dev)
2592 {
2593 	return read_pnet(&dev->nd_net);
2594 }
2595 
2596 static inline
dev_net_set(struct net_device * dev,struct net * net)2597 void dev_net_set(struct net_device *dev, struct net *net)
2598 {
2599 	write_pnet(&dev->nd_net, net);
2600 }
2601 
2602 /**
2603  *	netdev_priv - access network device private data
2604  *	@dev: network device
2605  *
2606  * Get network device private data
2607  */
netdev_priv(const struct net_device * dev)2608 static inline void *netdev_priv(const struct net_device *dev)
2609 {
2610 	return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
2611 }
2612 
2613 /* Set the sysfs physical device reference for the network logical device
2614  * if set prior to registration will cause a symlink during initialization.
2615  */
2616 #define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
2617 
2618 /* Set the sysfs device type for the network logical device to allow
2619  * fine-grained identification of different network device types. For
2620  * example Ethernet, Wireless LAN, Bluetooth, WiMAX etc.
2621  */
2622 #define SET_NETDEV_DEVTYPE(net, devtype)	((net)->dev.type = (devtype))
2623 
2624 /* Default NAPI poll() weight
2625  * Device drivers are strongly advised to not use bigger value
2626  */
2627 #define NAPI_POLL_WEIGHT 64
2628 
2629 void netif_napi_add_weight(struct net_device *dev, struct napi_struct *napi,
2630 			   int (*poll)(struct napi_struct *, int), int weight);
2631 
2632 /**
2633  * netif_napi_add() - initialize a NAPI context
2634  * @dev:  network device
2635  * @napi: NAPI context
2636  * @poll: polling function
2637  *
2638  * netif_napi_add() must be used to initialize a NAPI context prior to calling
2639  * *any* of the other NAPI-related functions.
2640  */
2641 static inline void
netif_napi_add(struct net_device * dev,struct napi_struct * napi,int (* poll)(struct napi_struct *,int))2642 netif_napi_add(struct net_device *dev, struct napi_struct *napi,
2643 	       int (*poll)(struct napi_struct *, int))
2644 {
2645 	netif_napi_add_weight(dev, napi, poll, NAPI_POLL_WEIGHT);
2646 }
2647 
2648 static inline void
netif_napi_add_tx_weight(struct net_device * dev,struct napi_struct * napi,int (* poll)(struct napi_struct *,int),int weight)2649 netif_napi_add_tx_weight(struct net_device *dev,
2650 			 struct napi_struct *napi,
2651 			 int (*poll)(struct napi_struct *, int),
2652 			 int weight)
2653 {
2654 	set_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state);
2655 	netif_napi_add_weight(dev, napi, poll, weight);
2656 }
2657 
2658 /**
2659  * netif_napi_add_tx() - initialize a NAPI context to be used for Tx only
2660  * @dev:  network device
2661  * @napi: NAPI context
2662  * @poll: polling function
2663  *
2664  * This variant of netif_napi_add() should be used from drivers using NAPI
2665  * to exclusively poll a TX queue.
2666  * This will avoid we add it into napi_hash[], thus polluting this hash table.
2667  */
netif_napi_add_tx(struct net_device * dev,struct napi_struct * napi,int (* poll)(struct napi_struct *,int))2668 static inline void netif_napi_add_tx(struct net_device *dev,
2669 				     struct napi_struct *napi,
2670 				     int (*poll)(struct napi_struct *, int))
2671 {
2672 	netif_napi_add_tx_weight(dev, napi, poll, NAPI_POLL_WEIGHT);
2673 }
2674 
2675 /**
2676  *  __netif_napi_del - remove a NAPI context
2677  *  @napi: NAPI context
2678  *
2679  * Warning: caller must observe RCU grace period before freeing memory
2680  * containing @napi. Drivers might want to call this helper to combine
2681  * all the needed RCU grace periods into a single one.
2682  */
2683 void __netif_napi_del(struct napi_struct *napi);
2684 
2685 /**
2686  *  netif_napi_del - remove a NAPI context
2687  *  @napi: NAPI context
2688  *
2689  *  netif_napi_del() removes a NAPI context from the network device NAPI list
2690  */
netif_napi_del(struct napi_struct * napi)2691 static inline void netif_napi_del(struct napi_struct *napi)
2692 {
2693 	__netif_napi_del(napi);
2694 	synchronize_net();
2695 }
2696 
2697 struct packet_type {
2698 	__be16			type;	/* This is really htons(ether_type). */
2699 	bool			ignore_outgoing;
2700 	struct net_device	*dev;	/* NULL is wildcarded here	     */
2701 	netdevice_tracker	dev_tracker;
2702 	int			(*func) (struct sk_buff *,
2703 					 struct net_device *,
2704 					 struct packet_type *,
2705 					 struct net_device *);
2706 	void			(*list_func) (struct list_head *,
2707 					      struct packet_type *,
2708 					      struct net_device *);
2709 	bool			(*id_match)(struct packet_type *ptype,
2710 					    struct sock *sk);
2711 	struct net		*af_packet_net;
2712 	void			*af_packet_priv;
2713 	struct list_head	list;
2714 };
2715 
2716 struct offload_callbacks {
2717 	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
2718 						netdev_features_t features);
2719 	struct sk_buff		*(*gro_receive)(struct list_head *head,
2720 						struct sk_buff *skb);
2721 	int			(*gro_complete)(struct sk_buff *skb, int nhoff);
2722 };
2723 
2724 struct packet_offload {
2725 	__be16			 type;	/* This is really htons(ether_type). */
2726 	u16			 priority;
2727 	struct offload_callbacks callbacks;
2728 	struct list_head	 list;
2729 };
2730 
2731 /* often modified stats are per-CPU, other are shared (netdev->stats) */
2732 struct pcpu_sw_netstats {
2733 	u64_stats_t		rx_packets;
2734 	u64_stats_t		rx_bytes;
2735 	u64_stats_t		tx_packets;
2736 	u64_stats_t		tx_bytes;
2737 	struct u64_stats_sync   syncp;
2738 } __aligned(4 * sizeof(u64));
2739 
2740 struct pcpu_dstats {
2741 	u64			rx_packets;
2742 	u64			rx_bytes;
2743 	u64			rx_drops;
2744 	u64			tx_packets;
2745 	u64			tx_bytes;
2746 	u64			tx_drops;
2747 	struct u64_stats_sync	syncp;
2748 } __aligned(8 * sizeof(u64));
2749 
2750 struct pcpu_lstats {
2751 	u64_stats_t packets;
2752 	u64_stats_t bytes;
2753 	struct u64_stats_sync syncp;
2754 } __aligned(2 * sizeof(u64));
2755 
2756 void dev_lstats_read(struct net_device *dev, u64 *packets, u64 *bytes);
2757 
dev_sw_netstats_rx_add(struct net_device * dev,unsigned int len)2758 static inline void dev_sw_netstats_rx_add(struct net_device *dev, unsigned int len)
2759 {
2760 	struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
2761 
2762 	u64_stats_update_begin(&tstats->syncp);
2763 	u64_stats_add(&tstats->rx_bytes, len);
2764 	u64_stats_inc(&tstats->rx_packets);
2765 	u64_stats_update_end(&tstats->syncp);
2766 }
2767 
dev_sw_netstats_tx_add(struct net_device * dev,unsigned int packets,unsigned int len)2768 static inline void dev_sw_netstats_tx_add(struct net_device *dev,
2769 					  unsigned int packets,
2770 					  unsigned int len)
2771 {
2772 	struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
2773 
2774 	u64_stats_update_begin(&tstats->syncp);
2775 	u64_stats_add(&tstats->tx_bytes, len);
2776 	u64_stats_add(&tstats->tx_packets, packets);
2777 	u64_stats_update_end(&tstats->syncp);
2778 }
2779 
dev_lstats_add(struct net_device * dev,unsigned int len)2780 static inline void dev_lstats_add(struct net_device *dev, unsigned int len)
2781 {
2782 	struct pcpu_lstats *lstats = this_cpu_ptr(dev->lstats);
2783 
2784 	u64_stats_update_begin(&lstats->syncp);
2785 	u64_stats_add(&lstats->bytes, len);
2786 	u64_stats_inc(&lstats->packets);
2787 	u64_stats_update_end(&lstats->syncp);
2788 }
2789 
2790 #define __netdev_alloc_pcpu_stats(type, gfp)				\
2791 ({									\
2792 	typeof(type) __percpu *pcpu_stats = alloc_percpu_gfp(type, gfp);\
2793 	if (pcpu_stats)	{						\
2794 		int __cpu;						\
2795 		for_each_possible_cpu(__cpu) {				\
2796 			typeof(type) *stat;				\
2797 			stat = per_cpu_ptr(pcpu_stats, __cpu);		\
2798 			u64_stats_init(&stat->syncp);			\
2799 		}							\
2800 	}								\
2801 	pcpu_stats;							\
2802 })
2803 
2804 #define netdev_alloc_pcpu_stats(type)					\
2805 	__netdev_alloc_pcpu_stats(type, GFP_KERNEL)
2806 
2807 #define devm_netdev_alloc_pcpu_stats(dev, type)				\
2808 ({									\
2809 	typeof(type) __percpu *pcpu_stats = devm_alloc_percpu(dev, type);\
2810 	if (pcpu_stats) {						\
2811 		int __cpu;						\
2812 		for_each_possible_cpu(__cpu) {				\
2813 			typeof(type) *stat;				\
2814 			stat = per_cpu_ptr(pcpu_stats, __cpu);		\
2815 			u64_stats_init(&stat->syncp);			\
2816 		}							\
2817 	}								\
2818 	pcpu_stats;							\
2819 })
2820 
2821 enum netdev_lag_tx_type {
2822 	NETDEV_LAG_TX_TYPE_UNKNOWN,
2823 	NETDEV_LAG_TX_TYPE_RANDOM,
2824 	NETDEV_LAG_TX_TYPE_BROADCAST,
2825 	NETDEV_LAG_TX_TYPE_ROUNDROBIN,
2826 	NETDEV_LAG_TX_TYPE_ACTIVEBACKUP,
2827 	NETDEV_LAG_TX_TYPE_HASH,
2828 };
2829 
2830 enum netdev_lag_hash {
2831 	NETDEV_LAG_HASH_NONE,
2832 	NETDEV_LAG_HASH_L2,
2833 	NETDEV_LAG_HASH_L34,
2834 	NETDEV_LAG_HASH_L23,
2835 	NETDEV_LAG_HASH_E23,
2836 	NETDEV_LAG_HASH_E34,
2837 	NETDEV_LAG_HASH_VLAN_SRCMAC,
2838 	NETDEV_LAG_HASH_UNKNOWN,
2839 };
2840 
2841 struct netdev_lag_upper_info {
2842 	enum netdev_lag_tx_type tx_type;
2843 	enum netdev_lag_hash hash_type;
2844 };
2845 
2846 struct netdev_lag_lower_state_info {
2847 	u8 link_up : 1,
2848 	   tx_enabled : 1;
2849 };
2850 
2851 #include <linux/notifier.h>
2852 
2853 /* netdevice notifier chain. Please remember to update netdev_cmd_to_name()
2854  * and the rtnetlink notification exclusion list in rtnetlink_event() when
2855  * adding new types.
2856  */
2857 enum netdev_cmd {
2858 	NETDEV_UP	= 1,	/* For now you can't veto a device up/down */
2859 	NETDEV_DOWN,
2860 	NETDEV_REBOOT,		/* Tell a protocol stack a network interface
2861 				   detected a hardware crash and restarted
2862 				   - we can use this eg to kick tcp sessions
2863 				   once done */
2864 	NETDEV_CHANGE,		/* Notify device state change */
2865 	NETDEV_REGISTER,
2866 	NETDEV_UNREGISTER,
2867 	NETDEV_CHANGEMTU,	/* notify after mtu change happened */
2868 	NETDEV_CHANGEADDR,	/* notify after the address change */
2869 	NETDEV_PRE_CHANGEADDR,	/* notify before the address change */
2870 	NETDEV_GOING_DOWN,
2871 	NETDEV_CHANGENAME,
2872 	NETDEV_FEAT_CHANGE,
2873 	NETDEV_BONDING_FAILOVER,
2874 	NETDEV_PRE_UP,
2875 	NETDEV_PRE_TYPE_CHANGE,
2876 	NETDEV_POST_TYPE_CHANGE,
2877 	NETDEV_POST_INIT,
2878 	NETDEV_PRE_UNINIT,
2879 	NETDEV_RELEASE,
2880 	NETDEV_NOTIFY_PEERS,
2881 	NETDEV_JOIN,
2882 	NETDEV_CHANGEUPPER,
2883 	NETDEV_RESEND_IGMP,
2884 	NETDEV_PRECHANGEMTU,	/* notify before mtu change happened */
2885 	NETDEV_CHANGEINFODATA,
2886 	NETDEV_BONDING_INFO,
2887 	NETDEV_PRECHANGEUPPER,
2888 	NETDEV_CHANGELOWERSTATE,
2889 	NETDEV_UDP_TUNNEL_PUSH_INFO,
2890 	NETDEV_UDP_TUNNEL_DROP_INFO,
2891 	NETDEV_CHANGE_TX_QUEUE_LEN,
2892 	NETDEV_CVLAN_FILTER_PUSH_INFO,
2893 	NETDEV_CVLAN_FILTER_DROP_INFO,
2894 	NETDEV_SVLAN_FILTER_PUSH_INFO,
2895 	NETDEV_SVLAN_FILTER_DROP_INFO,
2896 	NETDEV_OFFLOAD_XSTATS_ENABLE,
2897 	NETDEV_OFFLOAD_XSTATS_DISABLE,
2898 	NETDEV_OFFLOAD_XSTATS_REPORT_USED,
2899 	NETDEV_OFFLOAD_XSTATS_REPORT_DELTA,
2900 	NETDEV_XDP_FEAT_CHANGE,
2901 };
2902 const char *netdev_cmd_to_name(enum netdev_cmd cmd);
2903 
2904 int register_netdevice_notifier(struct notifier_block *nb);
2905 int unregister_netdevice_notifier(struct notifier_block *nb);
2906 int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb);
2907 int unregister_netdevice_notifier_net(struct net *net,
2908 				      struct notifier_block *nb);
2909 int register_netdevice_notifier_dev_net(struct net_device *dev,
2910 					struct notifier_block *nb,
2911 					struct netdev_net_notifier *nn);
2912 int unregister_netdevice_notifier_dev_net(struct net_device *dev,
2913 					  struct notifier_block *nb,
2914 					  struct netdev_net_notifier *nn);
2915 
2916 struct netdev_notifier_info {
2917 	struct net_device	*dev;
2918 	struct netlink_ext_ack	*extack;
2919 };
2920 
2921 struct netdev_notifier_info_ext {
2922 	struct netdev_notifier_info info; /* must be first */
2923 	union {
2924 		u32 mtu;
2925 	} ext;
2926 };
2927 
2928 struct netdev_notifier_change_info {
2929 	struct netdev_notifier_info info; /* must be first */
2930 	unsigned int flags_changed;
2931 };
2932 
2933 struct netdev_notifier_changeupper_info {
2934 	struct netdev_notifier_info info; /* must be first */
2935 	struct net_device *upper_dev; /* new upper dev */
2936 	bool master; /* is upper dev master */
2937 	bool linking; /* is the notification for link or unlink */
2938 	void *upper_info; /* upper dev info */
2939 };
2940 
2941 struct netdev_notifier_changelowerstate_info {
2942 	struct netdev_notifier_info info; /* must be first */
2943 	void *lower_state_info; /* is lower dev state */
2944 };
2945 
2946 struct netdev_notifier_pre_changeaddr_info {
2947 	struct netdev_notifier_info info; /* must be first */
2948 	const unsigned char *dev_addr;
2949 };
2950 
2951 enum netdev_offload_xstats_type {
2952 	NETDEV_OFFLOAD_XSTATS_TYPE_L3 = 1,
2953 };
2954 
2955 struct netdev_notifier_offload_xstats_info {
2956 	struct netdev_notifier_info info; /* must be first */
2957 	enum netdev_offload_xstats_type type;
2958 
2959 	union {
2960 		/* NETDEV_OFFLOAD_XSTATS_REPORT_DELTA */
2961 		struct netdev_notifier_offload_xstats_rd *report_delta;
2962 		/* NETDEV_OFFLOAD_XSTATS_REPORT_USED */
2963 		struct netdev_notifier_offload_xstats_ru *report_used;
2964 	};
2965 };
2966 
2967 int netdev_offload_xstats_enable(struct net_device *dev,
2968 				 enum netdev_offload_xstats_type type,
2969 				 struct netlink_ext_ack *extack);
2970 int netdev_offload_xstats_disable(struct net_device *dev,
2971 				  enum netdev_offload_xstats_type type);
2972 bool netdev_offload_xstats_enabled(const struct net_device *dev,
2973 				   enum netdev_offload_xstats_type type);
2974 int netdev_offload_xstats_get(struct net_device *dev,
2975 			      enum netdev_offload_xstats_type type,
2976 			      struct rtnl_hw_stats64 *stats, bool *used,
2977 			      struct netlink_ext_ack *extack);
2978 void
2979 netdev_offload_xstats_report_delta(struct netdev_notifier_offload_xstats_rd *rd,
2980 				   const struct rtnl_hw_stats64 *stats);
2981 void
2982 netdev_offload_xstats_report_used(struct netdev_notifier_offload_xstats_ru *ru);
2983 void netdev_offload_xstats_push_delta(struct net_device *dev,
2984 				      enum netdev_offload_xstats_type type,
2985 				      const struct rtnl_hw_stats64 *stats);
2986 
netdev_notifier_info_init(struct netdev_notifier_info * info,struct net_device * dev)2987 static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
2988 					     struct net_device *dev)
2989 {
2990 	info->dev = dev;
2991 	info->extack = NULL;
2992 }
2993 
2994 static inline struct net_device *
netdev_notifier_info_to_dev(const struct netdev_notifier_info * info)2995 netdev_notifier_info_to_dev(const struct netdev_notifier_info *info)
2996 {
2997 	return info->dev;
2998 }
2999 
3000 static inline struct netlink_ext_ack *
netdev_notifier_info_to_extack(const struct netdev_notifier_info * info)3001 netdev_notifier_info_to_extack(const struct netdev_notifier_info *info)
3002 {
3003 	return info->extack;
3004 }
3005 
3006 int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
3007 int call_netdevice_notifiers_info(unsigned long val,
3008 				  struct netdev_notifier_info *info);
3009 
3010 extern rwlock_t				dev_base_lock;		/* Device list lock */
3011 
3012 #define for_each_netdev(net, d)		\
3013 		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
3014 #define for_each_netdev_reverse(net, d)	\
3015 		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
3016 #define for_each_netdev_rcu(net, d)		\
3017 		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
3018 #define for_each_netdev_safe(net, d, n)	\
3019 		list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
3020 #define for_each_netdev_continue(net, d)		\
3021 		list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
3022 #define for_each_netdev_continue_reverse(net, d)		\
3023 		list_for_each_entry_continue_reverse(d, &(net)->dev_base_head, \
3024 						     dev_list)
3025 #define for_each_netdev_continue_rcu(net, d)		\
3026 	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
3027 #define for_each_netdev_in_bond_rcu(bond, slave)	\
3028 		for_each_netdev_rcu(&init_net, slave)	\
3029 			if (netdev_master_upper_dev_get_rcu(slave) == (bond))
3030 #define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
3031 
3032 #define for_each_netdev_dump(net, d, ifindex)				\
3033 	xa_for_each_start(&(net)->dev_by_index, (ifindex), (d), (ifindex))
3034 
next_net_device(struct net_device * dev)3035 static inline struct net_device *next_net_device(struct net_device *dev)
3036 {
3037 	struct list_head *lh;
3038 	struct net *net;
3039 
3040 	net = dev_net(dev);
3041 	lh = dev->dev_list.next;
3042 	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
3043 }
3044 
next_net_device_rcu(struct net_device * dev)3045 static inline struct net_device *next_net_device_rcu(struct net_device *dev)
3046 {
3047 	struct list_head *lh;
3048 	struct net *net;
3049 
3050 	net = dev_net(dev);
3051 	lh = rcu_dereference(list_next_rcu(&dev->dev_list));
3052 	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
3053 }
3054 
first_net_device(struct net * net)3055 static inline struct net_device *first_net_device(struct net *net)
3056 {
3057 	return list_empty(&net->dev_base_head) ? NULL :
3058 		net_device_entry(net->dev_base_head.next);
3059 }
3060 
first_net_device_rcu(struct net * net)3061 static inline struct net_device *first_net_device_rcu(struct net *net)
3062 {
3063 	struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head));
3064 
3065 	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
3066 }
3067 
3068 int netdev_boot_setup_check(struct net_device *dev);
3069 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
3070 				       const char *hwaddr);
3071 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
3072 void dev_add_pack(struct packet_type *pt);
3073 void dev_remove_pack(struct packet_type *pt);
3074 void __dev_remove_pack(struct packet_type *pt);
3075 void dev_add_offload(struct packet_offload *po);
3076 void dev_remove_offload(struct packet_offload *po);
3077 
3078 int dev_get_iflink(const struct net_device *dev);
3079 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb);
3080 int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr,
3081 			  struct net_device_path_stack *stack);
3082 struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags,
3083 				      unsigned short mask);
3084 struct net_device *dev_get_by_name(struct net *net, const char *name);
3085 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name);
3086 struct net_device *__dev_get_by_name(struct net *net, const char *name);
3087 bool netdev_name_in_use(struct net *net, const char *name);
3088 int dev_alloc_name(struct net_device *dev, const char *name);
3089 int dev_open(struct net_device *dev, struct netlink_ext_ack *extack);
3090 void dev_close(struct net_device *dev);
3091 void dev_close_many(struct list_head *head, bool unlink);
3092 void dev_disable_lro(struct net_device *dev);
3093 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *newskb);
3094 u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb,
3095 		     struct net_device *sb_dev);
3096 u16 dev_pick_tx_cpu_id(struct net_device *dev, struct sk_buff *skb,
3097 		       struct net_device *sb_dev);
3098 
3099 int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev);
3100 int __dev_direct_xmit(struct sk_buff *skb, u16 queue_id);
3101 
dev_queue_xmit(struct sk_buff * skb)3102 static inline int dev_queue_xmit(struct sk_buff *skb)
3103 {
3104 	return __dev_queue_xmit(skb, NULL);
3105 }
3106 
dev_queue_xmit_accel(struct sk_buff * skb,struct net_device * sb_dev)3107 static inline int dev_queue_xmit_accel(struct sk_buff *skb,
3108 				       struct net_device *sb_dev)
3109 {
3110 	return __dev_queue_xmit(skb, sb_dev);
3111 }
3112 
dev_direct_xmit(struct sk_buff * skb,u16 queue_id)3113 static inline int dev_direct_xmit(struct sk_buff *skb, u16 queue_id)
3114 {
3115 	int ret;
3116 
3117 	ret = __dev_direct_xmit(skb, queue_id);
3118 	if (!dev_xmit_complete(ret))
3119 		kfree_skb(skb);
3120 	return ret;
3121 }
3122 
3123 int register_netdevice(struct net_device *dev);
3124 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head);
3125 void unregister_netdevice_many(struct list_head *head);
unregister_netdevice(struct net_device * dev)3126 static inline void unregister_netdevice(struct net_device *dev)
3127 {
3128 	unregister_netdevice_queue(dev, NULL);
3129 }
3130 
3131 int netdev_refcnt_read(const struct net_device *dev);
3132 void free_netdev(struct net_device *dev);
3133 void netdev_freemem(struct net_device *dev);
3134 int init_dummy_netdev(struct net_device *dev);
3135 
3136 struct net_device *netdev_get_xmit_slave(struct net_device *dev,
3137 					 struct sk_buff *skb,
3138 					 bool all_slaves);
3139 struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev,
3140 					    struct sock *sk);
3141 struct net_device *dev_get_by_index(struct net *net, int ifindex);
3142 struct net_device *__dev_get_by_index(struct net *net, int ifindex);
3143 struct net_device *netdev_get_by_index(struct net *net, int ifindex,
3144 				       netdevice_tracker *tracker, gfp_t gfp);
3145 struct net_device *netdev_get_by_name(struct net *net, const char *name,
3146 				      netdevice_tracker *tracker, gfp_t gfp);
3147 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);
3148 struct net_device *dev_get_by_napi_id(unsigned int napi_id);
3149 
dev_hard_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned int len)3150 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
3151 				  unsigned short type,
3152 				  const void *daddr, const void *saddr,
3153 				  unsigned int len)
3154 {
3155 	if (!dev->header_ops || !dev->header_ops->create)
3156 		return 0;
3157 
3158 	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
3159 }
3160 
dev_parse_header(const struct sk_buff * skb,unsigned char * haddr)3161 static inline int dev_parse_header(const struct sk_buff *skb,
3162 				   unsigned char *haddr)
3163 {
3164 	const struct net_device *dev = skb->dev;
3165 
3166 	if (!dev->header_ops || !dev->header_ops->parse)
3167 		return 0;
3168 	return dev->header_ops->parse(skb, haddr);
3169 }
3170 
dev_parse_header_protocol(const struct sk_buff * skb)3171 static inline __be16 dev_parse_header_protocol(const struct sk_buff *skb)
3172 {
3173 	const struct net_device *dev = skb->dev;
3174 
3175 	if (!dev->header_ops || !dev->header_ops->parse_protocol)
3176 		return 0;
3177 	return dev->header_ops->parse_protocol(skb);
3178 }
3179 
3180 /* ll_header must have at least hard_header_len allocated */
dev_validate_header(const struct net_device * dev,char * ll_header,int len)3181 static inline bool dev_validate_header(const struct net_device *dev,
3182 				       char *ll_header, int len)
3183 {
3184 	if (likely(len >= dev->hard_header_len))
3185 		return true;
3186 	if (len < dev->min_header_len)
3187 		return false;
3188 
3189 	if (capable(CAP_SYS_RAWIO)) {
3190 		memset(ll_header + len, 0, dev->hard_header_len - len);
3191 		return true;
3192 	}
3193 
3194 	if (dev->header_ops && dev->header_ops->validate)
3195 		return dev->header_ops->validate(ll_header, len);
3196 
3197 	return false;
3198 }
3199 
dev_has_header(const struct net_device * dev)3200 static inline bool dev_has_header(const struct net_device *dev)
3201 {
3202 	return dev->header_ops && dev->header_ops->create;
3203 }
3204 
3205 /*
3206  * Incoming packets are placed on per-CPU queues
3207  */
3208 struct softnet_data {
3209 	struct list_head	poll_list;
3210 	struct sk_buff_head	process_queue;
3211 
3212 	/* stats */
3213 	unsigned int		processed;
3214 	unsigned int		time_squeeze;
3215 #ifdef CONFIG_RPS
3216 	struct softnet_data	*rps_ipi_list;
3217 #endif
3218 
3219 	bool			in_net_rx_action;
3220 	bool			in_napi_threaded_poll;
3221 
3222 #ifdef CONFIG_NET_FLOW_LIMIT
3223 	struct sd_flow_limit __rcu *flow_limit;
3224 #endif
3225 	struct Qdisc		*output_queue;
3226 	struct Qdisc		**output_queue_tailp;
3227 	struct sk_buff		*completion_queue;
3228 #ifdef CONFIG_XFRM_OFFLOAD
3229 	struct sk_buff_head	xfrm_backlog;
3230 #endif
3231 	/* written and read only by owning cpu: */
3232 	struct {
3233 		u16 recursion;
3234 		u8  more;
3235 #ifdef CONFIG_NET_EGRESS
3236 		u8  skip_txqueue;
3237 #endif
3238 	} xmit;
3239 #ifdef CONFIG_RPS
3240 	/* input_queue_head should be written by cpu owning this struct,
3241 	 * and only read by other cpus. Worth using a cache line.
3242 	 */
3243 	unsigned int		input_queue_head ____cacheline_aligned_in_smp;
3244 
3245 	/* Elements below can be accessed between CPUs for RPS/RFS */
3246 	call_single_data_t	csd ____cacheline_aligned_in_smp;
3247 	struct softnet_data	*rps_ipi_next;
3248 	unsigned int		cpu;
3249 	unsigned int		input_queue_tail;
3250 #endif
3251 	unsigned int		received_rps;
3252 	unsigned int		dropped;
3253 	struct sk_buff_head	input_pkt_queue;
3254 	struct napi_struct	backlog;
3255 
3256 	/* Another possibly contended cache line */
3257 	spinlock_t		defer_lock ____cacheline_aligned_in_smp;
3258 	int			defer_count;
3259 	int			defer_ipi_scheduled;
3260 	struct sk_buff		*defer_list;
3261 	call_single_data_t	defer_csd;
3262 };
3263 
input_queue_head_incr(struct softnet_data * sd)3264 static inline void input_queue_head_incr(struct softnet_data *sd)
3265 {
3266 #ifdef CONFIG_RPS
3267 	sd->input_queue_head++;
3268 #endif
3269 }
3270 
input_queue_tail_incr_save(struct softnet_data * sd,unsigned int * qtail)3271 static inline void input_queue_tail_incr_save(struct softnet_data *sd,
3272 					      unsigned int *qtail)
3273 {
3274 #ifdef CONFIG_RPS
3275 	*qtail = ++sd->input_queue_tail;
3276 #endif
3277 }
3278 
3279 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
3280 
dev_recursion_level(void)3281 static inline int dev_recursion_level(void)
3282 {
3283 	return this_cpu_read(softnet_data.xmit.recursion);
3284 }
3285 
3286 #define XMIT_RECURSION_LIMIT	8
dev_xmit_recursion(void)3287 static inline bool dev_xmit_recursion(void)
3288 {
3289 	return unlikely(__this_cpu_read(softnet_data.xmit.recursion) >
3290 			XMIT_RECURSION_LIMIT);
3291 }
3292 
dev_xmit_recursion_inc(void)3293 static inline void dev_xmit_recursion_inc(void)
3294 {
3295 	__this_cpu_inc(softnet_data.xmit.recursion);
3296 }
3297 
dev_xmit_recursion_dec(void)3298 static inline void dev_xmit_recursion_dec(void)
3299 {
3300 	__this_cpu_dec(softnet_data.xmit.recursion);
3301 }
3302 
3303 void __netif_schedule(struct Qdisc *q);
3304 void netif_schedule_queue(struct netdev_queue *txq);
3305 
netif_tx_schedule_all(struct net_device * dev)3306 static inline void netif_tx_schedule_all(struct net_device *dev)
3307 {
3308 	unsigned int i;
3309 
3310 	for (i = 0; i < dev->num_tx_queues; i++)
3311 		netif_schedule_queue(netdev_get_tx_queue(dev, i));
3312 }
3313 
netif_tx_start_queue(struct netdev_queue * dev_queue)3314 static __always_inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
3315 {
3316 	clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
3317 }
3318 
3319 /**
3320  *	netif_start_queue - allow transmit
3321  *	@dev: network device
3322  *
3323  *	Allow upper layers to call the device hard_start_xmit routine.
3324  */
netif_start_queue(struct net_device * dev)3325 static inline void netif_start_queue(struct net_device *dev)
3326 {
3327 	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
3328 }
3329 
netif_tx_start_all_queues(struct net_device * dev)3330 static inline void netif_tx_start_all_queues(struct net_device *dev)
3331 {
3332 	unsigned int i;
3333 
3334 	for (i = 0; i < dev->num_tx_queues; i++) {
3335 		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3336 		netif_tx_start_queue(txq);
3337 	}
3338 }
3339 
3340 void netif_tx_wake_queue(struct netdev_queue *dev_queue);
3341 
3342 /**
3343  *	netif_wake_queue - restart transmit
3344  *	@dev: network device
3345  *
3346  *	Allow upper layers to call the device hard_start_xmit routine.
3347  *	Used for flow control when transmit resources are available.
3348  */
netif_wake_queue(struct net_device * dev)3349 static inline void netif_wake_queue(struct net_device *dev)
3350 {
3351 	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
3352 }
3353 
netif_tx_wake_all_queues(struct net_device * dev)3354 static inline void netif_tx_wake_all_queues(struct net_device *dev)
3355 {
3356 	unsigned int i;
3357 
3358 	for (i = 0; i < dev->num_tx_queues; i++) {
3359 		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3360 		netif_tx_wake_queue(txq);
3361 	}
3362 }
3363 
netif_tx_stop_queue(struct netdev_queue * dev_queue)3364 static __always_inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
3365 {
3366 	/* Must be an atomic op see netif_txq_try_stop() */
3367 	set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
3368 }
3369 
3370 /**
3371  *	netif_stop_queue - stop transmitted packets
3372  *	@dev: network device
3373  *
3374  *	Stop upper layers calling the device hard_start_xmit routine.
3375  *	Used for flow control when transmit resources are unavailable.
3376  */
netif_stop_queue(struct net_device * dev)3377 static inline void netif_stop_queue(struct net_device *dev)
3378 {
3379 	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
3380 }
3381 
3382 void netif_tx_stop_all_queues(struct net_device *dev);
3383 
netif_tx_queue_stopped(const struct netdev_queue * dev_queue)3384 static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
3385 {
3386 	return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
3387 }
3388 
3389 /**
3390  *	netif_queue_stopped - test if transmit queue is flowblocked
3391  *	@dev: network device
3392  *
3393  *	Test if transmit queue on device is currently unable to send.
3394  */
netif_queue_stopped(const struct net_device * dev)3395 static inline bool netif_queue_stopped(const struct net_device *dev)
3396 {
3397 	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
3398 }
3399 
netif_xmit_stopped(const struct netdev_queue * dev_queue)3400 static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
3401 {
3402 	return dev_queue->state & QUEUE_STATE_ANY_XOFF;
3403 }
3404 
3405 static inline bool
netif_xmit_frozen_or_stopped(const struct netdev_queue * dev_queue)3406 netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
3407 {
3408 	return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
3409 }
3410 
3411 static inline bool
netif_xmit_frozen_or_drv_stopped(const struct netdev_queue * dev_queue)3412 netif_xmit_frozen_or_drv_stopped(const struct netdev_queue *dev_queue)
3413 {
3414 	return dev_queue->state & QUEUE_STATE_DRV_XOFF_OR_FROZEN;
3415 }
3416 
3417 /**
3418  *	netdev_queue_set_dql_min_limit - set dql minimum limit
3419  *	@dev_queue: pointer to transmit queue
3420  *	@min_limit: dql minimum limit
3421  *
3422  * Forces xmit_more() to return true until the minimum threshold
3423  * defined by @min_limit is reached (or until the tx queue is
3424  * empty). Warning: to be use with care, misuse will impact the
3425  * latency.
3426  */
netdev_queue_set_dql_min_limit(struct netdev_queue * dev_queue,unsigned int min_limit)3427 static inline void netdev_queue_set_dql_min_limit(struct netdev_queue *dev_queue,
3428 						  unsigned int min_limit)
3429 {
3430 #ifdef CONFIG_BQL
3431 	dev_queue->dql.min_limit = min_limit;
3432 #endif
3433 }
3434 
3435 /**
3436  *	netdev_txq_bql_enqueue_prefetchw - prefetch bql data for write
3437  *	@dev_queue: pointer to transmit queue
3438  *
3439  * BQL enabled drivers might use this helper in their ndo_start_xmit(),
3440  * to give appropriate hint to the CPU.
3441  */
netdev_txq_bql_enqueue_prefetchw(struct netdev_queue * dev_queue)3442 static inline void netdev_txq_bql_enqueue_prefetchw(struct netdev_queue *dev_queue)
3443 {
3444 #ifdef CONFIG_BQL
3445 	prefetchw(&dev_queue->dql.num_queued);
3446 #endif
3447 }
3448 
3449 /**
3450  *	netdev_txq_bql_complete_prefetchw - prefetch bql data for write
3451  *	@dev_queue: pointer to transmit queue
3452  *
3453  * BQL enabled drivers might use this helper in their TX completion path,
3454  * to give appropriate hint to the CPU.
3455  */
netdev_txq_bql_complete_prefetchw(struct netdev_queue * dev_queue)3456 static inline void netdev_txq_bql_complete_prefetchw(struct netdev_queue *dev_queue)
3457 {
3458 #ifdef CONFIG_BQL
3459 	prefetchw(&dev_queue->dql.limit);
3460 #endif
3461 }
3462 
3463 /**
3464  *	netdev_tx_sent_queue - report the number of bytes queued to a given tx queue
3465  *	@dev_queue: network device queue
3466  *	@bytes: number of bytes queued to the device queue
3467  *
3468  *	Report the number of bytes queued for sending/completion to the network
3469  *	device hardware queue. @bytes should be a good approximation and should
3470  *	exactly match netdev_completed_queue() @bytes.
3471  *	This is typically called once per packet, from ndo_start_xmit().
3472  */
netdev_tx_sent_queue(struct netdev_queue * dev_queue,unsigned int bytes)3473 static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
3474 					unsigned int bytes)
3475 {
3476 #ifdef CONFIG_BQL
3477 	dql_queued(&dev_queue->dql, bytes);
3478 
3479 	if (likely(dql_avail(&dev_queue->dql) >= 0))
3480 		return;
3481 
3482 	set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
3483 
3484 	/*
3485 	 * The XOFF flag must be set before checking the dql_avail below,
3486 	 * because in netdev_tx_completed_queue we update the dql_completed
3487 	 * before checking the XOFF flag.
3488 	 */
3489 	smp_mb();
3490 
3491 	/* check again in case another CPU has just made room avail */
3492 	if (unlikely(dql_avail(&dev_queue->dql) >= 0))
3493 		clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
3494 #endif
3495 }
3496 
3497 /* Variant of netdev_tx_sent_queue() for drivers that are aware
3498  * that they should not test BQL status themselves.
3499  * We do want to change __QUEUE_STATE_STACK_XOFF only for the last
3500  * skb of a batch.
3501  * Returns true if the doorbell must be used to kick the NIC.
3502  */
__netdev_tx_sent_queue(struct netdev_queue * dev_queue,unsigned int bytes,bool xmit_more)3503 static inline bool __netdev_tx_sent_queue(struct netdev_queue *dev_queue,
3504 					  unsigned int bytes,
3505 					  bool xmit_more)
3506 {
3507 	if (xmit_more) {
3508 #ifdef CONFIG_BQL
3509 		dql_queued(&dev_queue->dql, bytes);
3510 #endif
3511 		return netif_tx_queue_stopped(dev_queue);
3512 	}
3513 	netdev_tx_sent_queue(dev_queue, bytes);
3514 	return true;
3515 }
3516 
3517 /**
3518  *	netdev_sent_queue - report the number of bytes queued to hardware
3519  *	@dev: network device
3520  *	@bytes: number of bytes queued to the hardware device queue
3521  *
3522  *	Report the number of bytes queued for sending/completion to the network
3523  *	device hardware queue#0. @bytes should be a good approximation and should
3524  *	exactly match netdev_completed_queue() @bytes.
3525  *	This is typically called once per packet, from ndo_start_xmit().
3526  */
netdev_sent_queue(struct net_device * dev,unsigned int bytes)3527 static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes)
3528 {
3529 	netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes);
3530 }
3531 
__netdev_sent_queue(struct net_device * dev,unsigned int bytes,bool xmit_more)3532 static inline bool __netdev_sent_queue(struct net_device *dev,
3533 				       unsigned int bytes,
3534 				       bool xmit_more)
3535 {
3536 	return __netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes,
3537 				      xmit_more);
3538 }
3539 
3540 /**
3541  *	netdev_tx_completed_queue - report number of packets/bytes at TX completion.
3542  *	@dev_queue: network device queue
3543  *	@pkts: number of packets (currently ignored)
3544  *	@bytes: number of bytes dequeued from the device queue
3545  *
3546  *	Must be called at most once per TX completion round (and not per
3547  *	individual packet), so that BQL can adjust its limits appropriately.
3548  */
netdev_tx_completed_queue(struct netdev_queue * dev_queue,unsigned int pkts,unsigned int bytes)3549 static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue,
3550 					     unsigned int pkts, unsigned int bytes)
3551 {
3552 #ifdef CONFIG_BQL
3553 	if (unlikely(!bytes))
3554 		return;
3555 
3556 	dql_completed(&dev_queue->dql, bytes);
3557 
3558 	/*
3559 	 * Without the memory barrier there is a small possiblity that
3560 	 * netdev_tx_sent_queue will miss the update and cause the queue to
3561 	 * be stopped forever
3562 	 */
3563 	smp_mb(); /* NOTE: netdev_txq_completed_mb() assumes this exists */
3564 
3565 	if (unlikely(dql_avail(&dev_queue->dql) < 0))
3566 		return;
3567 
3568 	if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state))
3569 		netif_schedule_queue(dev_queue);
3570 #endif
3571 }
3572 
3573 /**
3574  * 	netdev_completed_queue - report bytes and packets completed by device
3575  * 	@dev: network device
3576  * 	@pkts: actual number of packets sent over the medium
3577  * 	@bytes: actual number of bytes sent over the medium
3578  *
3579  * 	Report the number of bytes and packets transmitted by the network device
3580  * 	hardware queue over the physical medium, @bytes must exactly match the
3581  * 	@bytes amount passed to netdev_sent_queue()
3582  */
netdev_completed_queue(struct net_device * dev,unsigned int pkts,unsigned int bytes)3583 static inline void netdev_completed_queue(struct net_device *dev,
3584 					  unsigned int pkts, unsigned int bytes)
3585 {
3586 	netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes);
3587 }
3588 
netdev_tx_reset_queue(struct netdev_queue * q)3589 static inline void netdev_tx_reset_queue(struct netdev_queue *q)
3590 {
3591 #ifdef CONFIG_BQL
3592 	clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
3593 	dql_reset(&q->dql);
3594 #endif
3595 }
3596 
3597 /**
3598  * 	netdev_reset_queue - reset the packets and bytes count of a network device
3599  * 	@dev_queue: network device
3600  *
3601  * 	Reset the bytes and packet count of a network device and clear the
3602  * 	software flow control OFF bit for this network device
3603  */
netdev_reset_queue(struct net_device * dev_queue)3604 static inline void netdev_reset_queue(struct net_device *dev_queue)
3605 {
3606 	netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
3607 }
3608 
3609 /**
3610  * 	netdev_cap_txqueue - check if selected tx queue exceeds device queues
3611  * 	@dev: network device
3612  * 	@queue_index: given tx queue index
3613  *
3614  * 	Returns 0 if given tx queue index >= number of device tx queues,
3615  * 	otherwise returns the originally passed tx queue index.
3616  */
netdev_cap_txqueue(struct net_device * dev,u16 queue_index)3617 static inline u16 netdev_cap_txqueue(struct net_device *dev, u16 queue_index)
3618 {
3619 	if (unlikely(queue_index >= dev->real_num_tx_queues)) {
3620 		net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
3621 				     dev->name, queue_index,
3622 				     dev->real_num_tx_queues);
3623 		return 0;
3624 	}
3625 
3626 	return queue_index;
3627 }
3628 
3629 /**
3630  *	netif_running - test if up
3631  *	@dev: network device
3632  *
3633  *	Test if the device has been brought up.
3634  */
netif_running(const struct net_device * dev)3635 static inline bool netif_running(const struct net_device *dev)
3636 {
3637 	return test_bit(__LINK_STATE_START, &dev->state);
3638 }
3639 
3640 /*
3641  * Routines to manage the subqueues on a device.  We only need start,
3642  * stop, and a check if it's stopped.  All other device management is
3643  * done at the overall netdevice level.
3644  * Also test the device if we're multiqueue.
3645  */
3646 
3647 /**
3648  *	netif_start_subqueue - allow sending packets on subqueue
3649  *	@dev: network device
3650  *	@queue_index: sub queue index
3651  *
3652  * Start individual transmit queue of a device with multiple transmit queues.
3653  */
netif_start_subqueue(struct net_device * dev,u16 queue_index)3654 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
3655 {
3656 	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3657 
3658 	netif_tx_start_queue(txq);
3659 }
3660 
3661 /**
3662  *	netif_stop_subqueue - stop sending packets on subqueue
3663  *	@dev: network device
3664  *	@queue_index: sub queue index
3665  *
3666  * Stop individual transmit queue of a device with multiple transmit queues.
3667  */
netif_stop_subqueue(struct net_device * dev,u16 queue_index)3668 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
3669 {
3670 	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3671 	netif_tx_stop_queue(txq);
3672 }
3673 
3674 /**
3675  *	__netif_subqueue_stopped - test status of subqueue
3676  *	@dev: network device
3677  *	@queue_index: sub queue index
3678  *
3679  * Check individual transmit queue of a device with multiple transmit queues.
3680  */
__netif_subqueue_stopped(const struct net_device * dev,u16 queue_index)3681 static inline bool __netif_subqueue_stopped(const struct net_device *dev,
3682 					    u16 queue_index)
3683 {
3684 	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3685 
3686 	return netif_tx_queue_stopped(txq);
3687 }
3688 
3689 /**
3690  *	netif_subqueue_stopped - test status of subqueue
3691  *	@dev: network device
3692  *	@skb: sub queue buffer pointer
3693  *
3694  * Check individual transmit queue of a device with multiple transmit queues.
3695  */
netif_subqueue_stopped(const struct net_device * dev,struct sk_buff * skb)3696 static inline bool netif_subqueue_stopped(const struct net_device *dev,
3697 					  struct sk_buff *skb)
3698 {
3699 	return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
3700 }
3701 
3702 /**
3703  *	netif_wake_subqueue - allow sending packets on subqueue
3704  *	@dev: network device
3705  *	@queue_index: sub queue index
3706  *
3707  * Resume individual transmit queue of a device with multiple transmit queues.
3708  */
netif_wake_subqueue(struct net_device * dev,u16 queue_index)3709 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
3710 {
3711 	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3712 
3713 	netif_tx_wake_queue(txq);
3714 }
3715 
3716 #ifdef CONFIG_XPS
3717 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
3718 			u16 index);
3719 int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
3720 			  u16 index, enum xps_map_type type);
3721 
3722 /**
3723  *	netif_attr_test_mask - Test a CPU or Rx queue set in a mask
3724  *	@j: CPU/Rx queue index
3725  *	@mask: bitmask of all cpus/rx queues
3726  *	@nr_bits: number of bits in the bitmask
3727  *
3728  * Test if a CPU or Rx queue index is set in a mask of all CPU/Rx queues.
3729  */
netif_attr_test_mask(unsigned long j,const unsigned long * mask,unsigned int nr_bits)3730 static inline bool netif_attr_test_mask(unsigned long j,
3731 					const unsigned long *mask,
3732 					unsigned int nr_bits)
3733 {
3734 	cpu_max_bits_warn(j, nr_bits);
3735 	return test_bit(j, mask);
3736 }
3737 
3738 /**
3739  *	netif_attr_test_online - Test for online CPU/Rx queue
3740  *	@j: CPU/Rx queue index
3741  *	@online_mask: bitmask for CPUs/Rx queues that are online
3742  *	@nr_bits: number of bits in the bitmask
3743  *
3744  * Returns true if a CPU/Rx queue is online.
3745  */
netif_attr_test_online(unsigned long j,const unsigned long * online_mask,unsigned int nr_bits)3746 static inline bool netif_attr_test_online(unsigned long j,
3747 					  const unsigned long *online_mask,
3748 					  unsigned int nr_bits)
3749 {
3750 	cpu_max_bits_warn(j, nr_bits);
3751 
3752 	if (online_mask)
3753 		return test_bit(j, online_mask);
3754 
3755 	return (j < nr_bits);
3756 }
3757 
3758 /**
3759  *	netif_attrmask_next - get the next CPU/Rx queue in a cpu/Rx queues mask
3760  *	@n: CPU/Rx queue index
3761  *	@srcp: the cpumask/Rx queue mask pointer
3762  *	@nr_bits: number of bits in the bitmask
3763  *
3764  * Returns >= nr_bits if no further CPUs/Rx queues set.
3765  */
netif_attrmask_next(int n,const unsigned long * srcp,unsigned int nr_bits)3766 static inline unsigned int netif_attrmask_next(int n, const unsigned long *srcp,
3767 					       unsigned int nr_bits)
3768 {
3769 	/* -1 is a legal arg here. */
3770 	if (n != -1)
3771 		cpu_max_bits_warn(n, nr_bits);
3772 
3773 	if (srcp)
3774 		return find_next_bit(srcp, nr_bits, n + 1);
3775 
3776 	return n + 1;
3777 }
3778 
3779 /**
3780  *	netif_attrmask_next_and - get the next CPU/Rx queue in \*src1p & \*src2p
3781  *	@n: CPU/Rx queue index
3782  *	@src1p: the first CPUs/Rx queues mask pointer
3783  *	@src2p: the second CPUs/Rx queues mask pointer
3784  *	@nr_bits: number of bits in the bitmask
3785  *
3786  * Returns >= nr_bits if no further CPUs/Rx queues set in both.
3787  */
netif_attrmask_next_and(int n,const unsigned long * src1p,const unsigned long * src2p,unsigned int nr_bits)3788 static inline int netif_attrmask_next_and(int n, const unsigned long *src1p,
3789 					  const unsigned long *src2p,
3790 					  unsigned int nr_bits)
3791 {
3792 	/* -1 is a legal arg here. */
3793 	if (n != -1)
3794 		cpu_max_bits_warn(n, nr_bits);
3795 
3796 	if (src1p && src2p)
3797 		return find_next_and_bit(src1p, src2p, nr_bits, n + 1);
3798 	else if (src1p)
3799 		return find_next_bit(src1p, nr_bits, n + 1);
3800 	else if (src2p)
3801 		return find_next_bit(src2p, nr_bits, n + 1);
3802 
3803 	return n + 1;
3804 }
3805 #else
netif_set_xps_queue(struct net_device * dev,const struct cpumask * mask,u16 index)3806 static inline int netif_set_xps_queue(struct net_device *dev,
3807 				      const struct cpumask *mask,
3808 				      u16 index)
3809 {
3810 	return 0;
3811 }
3812 
__netif_set_xps_queue(struct net_device * dev,const unsigned long * mask,u16 index,enum xps_map_type type)3813 static inline int __netif_set_xps_queue(struct net_device *dev,
3814 					const unsigned long *mask,
3815 					u16 index, enum xps_map_type type)
3816 {
3817 	return 0;
3818 }
3819 #endif
3820 
3821 /**
3822  *	netif_is_multiqueue - test if device has multiple transmit queues
3823  *	@dev: network device
3824  *
3825  * Check if device has multiple transmit queues
3826  */
netif_is_multiqueue(const struct net_device * dev)3827 static inline bool netif_is_multiqueue(const struct net_device *dev)
3828 {
3829 	return dev->num_tx_queues > 1;
3830 }
3831 
3832 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq);
3833 
3834 #ifdef CONFIG_SYSFS
3835 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq);
3836 #else
netif_set_real_num_rx_queues(struct net_device * dev,unsigned int rxqs)3837 static inline int netif_set_real_num_rx_queues(struct net_device *dev,
3838 						unsigned int rxqs)
3839 {
3840 	dev->real_num_rx_queues = rxqs;
3841 	return 0;
3842 }
3843 #endif
3844 int netif_set_real_num_queues(struct net_device *dev,
3845 			      unsigned int txq, unsigned int rxq);
3846 
3847 int netif_get_num_default_rss_queues(void);
3848 
3849 void dev_kfree_skb_irq_reason(struct sk_buff *skb, enum skb_drop_reason reason);
3850 void dev_kfree_skb_any_reason(struct sk_buff *skb, enum skb_drop_reason reason);
3851 
3852 /*
3853  * It is not allowed to call kfree_skb() or consume_skb() from hardware
3854  * interrupt context or with hardware interrupts being disabled.
3855  * (in_hardirq() || irqs_disabled())
3856  *
3857  * We provide four helpers that can be used in following contexts :
3858  *
3859  * dev_kfree_skb_irq(skb) when caller drops a packet from irq context,
3860  *  replacing kfree_skb(skb)
3861  *
3862  * dev_consume_skb_irq(skb) when caller consumes a packet from irq context.
3863  *  Typically used in place of consume_skb(skb) in TX completion path
3864  *
3865  * dev_kfree_skb_any(skb) when caller doesn't know its current irq context,
3866  *  replacing kfree_skb(skb)
3867  *
3868  * dev_consume_skb_any(skb) when caller doesn't know its current irq context,
3869  *  and consumed a packet. Used in place of consume_skb(skb)
3870  */
dev_kfree_skb_irq(struct sk_buff * skb)3871 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
3872 {
3873 	dev_kfree_skb_irq_reason(skb, SKB_DROP_REASON_NOT_SPECIFIED);
3874 }
3875 
dev_consume_skb_irq(struct sk_buff * skb)3876 static inline void dev_consume_skb_irq(struct sk_buff *skb)
3877 {
3878 	dev_kfree_skb_irq_reason(skb, SKB_CONSUMED);
3879 }
3880 
dev_kfree_skb_any(struct sk_buff * skb)3881 static inline void dev_kfree_skb_any(struct sk_buff *skb)
3882 {
3883 	dev_kfree_skb_any_reason(skb, SKB_DROP_REASON_NOT_SPECIFIED);
3884 }
3885 
dev_consume_skb_any(struct sk_buff * skb)3886 static inline void dev_consume_skb_any(struct sk_buff *skb)
3887 {
3888 	dev_kfree_skb_any_reason(skb, SKB_CONSUMED);
3889 }
3890 
3891 u32 bpf_prog_run_generic_xdp(struct sk_buff *skb, struct xdp_buff *xdp,
3892 			     struct bpf_prog *xdp_prog);
3893 void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog);
3894 int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb);
3895 int netif_rx(struct sk_buff *skb);
3896 int __netif_rx(struct sk_buff *skb);
3897 
3898 int netif_receive_skb(struct sk_buff *skb);
3899 int netif_receive_skb_core(struct sk_buff *skb);
3900 void netif_receive_skb_list_internal(struct list_head *head);
3901 void netif_receive_skb_list(struct list_head *head);
3902 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb);
3903 void napi_gro_flush(struct napi_struct *napi, bool flush_old);
3904 struct sk_buff *napi_get_frags(struct napi_struct *napi);
3905 void napi_get_frags_check(struct napi_struct *napi);
3906 gro_result_t napi_gro_frags(struct napi_struct *napi);
3907 struct packet_offload *gro_find_receive_by_type(__be16 type);
3908 struct packet_offload *gro_find_complete_by_type(__be16 type);
3909 
napi_free_frags(struct napi_struct * napi)3910 static inline void napi_free_frags(struct napi_struct *napi)
3911 {
3912 	kfree_skb(napi->skb);
3913 	napi->skb = NULL;
3914 }
3915 
3916 bool netdev_is_rx_handler_busy(struct net_device *dev);
3917 int netdev_rx_handler_register(struct net_device *dev,
3918 			       rx_handler_func_t *rx_handler,
3919 			       void *rx_handler_data);
3920 void netdev_rx_handler_unregister(struct net_device *dev);
3921 
3922 bool dev_valid_name(const char *name);
is_socket_ioctl_cmd(unsigned int cmd)3923 static inline bool is_socket_ioctl_cmd(unsigned int cmd)
3924 {
3925 	return _IOC_TYPE(cmd) == SOCK_IOC_TYPE;
3926 }
3927 int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg);
3928 int put_user_ifreq(struct ifreq *ifr, void __user *arg);
3929 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
3930 		void __user *data, bool *need_copyout);
3931 int dev_ifconf(struct net *net, struct ifconf __user *ifc);
3932 int generic_hwtstamp_get_lower(struct net_device *dev,
3933 			       struct kernel_hwtstamp_config *kernel_cfg);
3934 int generic_hwtstamp_set_lower(struct net_device *dev,
3935 			       struct kernel_hwtstamp_config *kernel_cfg,
3936 			       struct netlink_ext_ack *extack);
3937 int dev_ethtool(struct net *net, struct ifreq *ifr, void __user *userdata);
3938 unsigned int dev_get_flags(const struct net_device *);
3939 int __dev_change_flags(struct net_device *dev, unsigned int flags,
3940 		       struct netlink_ext_ack *extack);
3941 int dev_change_flags(struct net_device *dev, unsigned int flags,
3942 		     struct netlink_ext_ack *extack);
3943 int dev_set_alias(struct net_device *, const char *, size_t);
3944 int dev_get_alias(const struct net_device *, char *, size_t);
3945 int __dev_change_net_namespace(struct net_device *dev, struct net *net,
3946 			       const char *pat, int new_ifindex);
3947 static inline
dev_change_net_namespace(struct net_device * dev,struct net * net,const char * pat)3948 int dev_change_net_namespace(struct net_device *dev, struct net *net,
3949 			     const char *pat)
3950 {
3951 	return __dev_change_net_namespace(dev, net, pat, 0);
3952 }
3953 int __dev_set_mtu(struct net_device *, int);
3954 int dev_set_mtu(struct net_device *, int);
3955 int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr,
3956 			      struct netlink_ext_ack *extack);
3957 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
3958 			struct netlink_ext_ack *extack);
3959 int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa,
3960 			     struct netlink_ext_ack *extack);
3961 int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name);
3962 int dev_get_port_parent_id(struct net_device *dev,
3963 			   struct netdev_phys_item_id *ppid, bool recurse);
3964 bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b);
3965 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again);
3966 struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
3967 				    struct netdev_queue *txq, int *ret);
3968 
3969 int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
3970 u8 dev_xdp_prog_count(struct net_device *dev);
3971 u32 dev_xdp_prog_id(struct net_device *dev, enum bpf_xdp_mode mode);
3972 
3973 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
3974 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
3975 int dev_forward_skb_nomtu(struct net_device *dev, struct sk_buff *skb);
3976 bool is_skb_forwardable(const struct net_device *dev,
3977 			const struct sk_buff *skb);
3978 
__is_skb_forwardable(const struct net_device * dev,const struct sk_buff * skb,const bool check_mtu)3979 static __always_inline bool __is_skb_forwardable(const struct net_device *dev,
3980 						 const struct sk_buff *skb,
3981 						 const bool check_mtu)
3982 {
3983 	const u32 vlan_hdr_len = 4; /* VLAN_HLEN */
3984 	unsigned int len;
3985 
3986 	if (!(dev->flags & IFF_UP))
3987 		return false;
3988 
3989 	if (!check_mtu)
3990 		return true;
3991 
3992 	len = dev->mtu + dev->hard_header_len + vlan_hdr_len;
3993 	if (skb->len <= len)
3994 		return true;
3995 
3996 	/* if TSO is enabled, we don't care about the length as the packet
3997 	 * could be forwarded without being segmented before
3998 	 */
3999 	if (skb_is_gso(skb))
4000 		return true;
4001 
4002 	return false;
4003 }
4004 
4005 struct net_device_core_stats __percpu *netdev_core_stats_alloc(struct net_device *dev);
4006 
dev_core_stats(struct net_device * dev)4007 static inline struct net_device_core_stats __percpu *dev_core_stats(struct net_device *dev)
4008 {
4009 	/* This READ_ONCE() pairs with the write in netdev_core_stats_alloc() */
4010 	struct net_device_core_stats __percpu *p = READ_ONCE(dev->core_stats);
4011 
4012 	if (likely(p))
4013 		return p;
4014 
4015 	return netdev_core_stats_alloc(dev);
4016 }
4017 
4018 #define DEV_CORE_STATS_INC(FIELD)						\
4019 static inline void dev_core_stats_##FIELD##_inc(struct net_device *dev)		\
4020 {										\
4021 	struct net_device_core_stats __percpu *p;				\
4022 										\
4023 	p = dev_core_stats(dev);						\
4024 	if (p)									\
4025 		this_cpu_inc(p->FIELD);						\
4026 }
4027 DEV_CORE_STATS_INC(rx_dropped)
DEV_CORE_STATS_INC(tx_dropped)4028 DEV_CORE_STATS_INC(tx_dropped)
4029 DEV_CORE_STATS_INC(rx_nohandler)
4030 DEV_CORE_STATS_INC(rx_otherhost_dropped)
4031 
4032 static __always_inline int ____dev_forward_skb(struct net_device *dev,
4033 					       struct sk_buff *skb,
4034 					       const bool check_mtu)
4035 {
4036 	if (skb_orphan_frags(skb, GFP_ATOMIC) ||
4037 	    unlikely(!__is_skb_forwardable(dev, skb, check_mtu))) {
4038 		dev_core_stats_rx_dropped_inc(dev);
4039 		kfree_skb(skb);
4040 		return NET_RX_DROP;
4041 	}
4042 
4043 	skb_scrub_packet(skb, !net_eq(dev_net(dev), dev_net(skb->dev)));
4044 	skb->priority = 0;
4045 	return 0;
4046 }
4047 
4048 bool dev_nit_active(struct net_device *dev);
4049 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
4050 
__dev_put(struct net_device * dev)4051 static inline void __dev_put(struct net_device *dev)
4052 {
4053 	if (dev) {
4054 #ifdef CONFIG_PCPU_DEV_REFCNT
4055 		this_cpu_dec(*dev->pcpu_refcnt);
4056 #else
4057 		refcount_dec(&dev->dev_refcnt);
4058 #endif
4059 	}
4060 }
4061 
__dev_hold(struct net_device * dev)4062 static inline void __dev_hold(struct net_device *dev)
4063 {
4064 	if (dev) {
4065 #ifdef CONFIG_PCPU_DEV_REFCNT
4066 		this_cpu_inc(*dev->pcpu_refcnt);
4067 #else
4068 		refcount_inc(&dev->dev_refcnt);
4069 #endif
4070 	}
4071 }
4072 
__netdev_tracker_alloc(struct net_device * dev,netdevice_tracker * tracker,gfp_t gfp)4073 static inline void __netdev_tracker_alloc(struct net_device *dev,
4074 					  netdevice_tracker *tracker,
4075 					  gfp_t gfp)
4076 {
4077 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER
4078 	ref_tracker_alloc(&dev->refcnt_tracker, tracker, gfp);
4079 #endif
4080 }
4081 
4082 /* netdev_tracker_alloc() can upgrade a prior untracked reference
4083  * taken by dev_get_by_name()/dev_get_by_index() to a tracked one.
4084  */
netdev_tracker_alloc(struct net_device * dev,netdevice_tracker * tracker,gfp_t gfp)4085 static inline void netdev_tracker_alloc(struct net_device *dev,
4086 					netdevice_tracker *tracker, gfp_t gfp)
4087 {
4088 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER
4089 	refcount_dec(&dev->refcnt_tracker.no_tracker);
4090 	__netdev_tracker_alloc(dev, tracker, gfp);
4091 #endif
4092 }
4093 
netdev_tracker_free(struct net_device * dev,netdevice_tracker * tracker)4094 static inline void netdev_tracker_free(struct net_device *dev,
4095 				       netdevice_tracker *tracker)
4096 {
4097 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER
4098 	ref_tracker_free(&dev->refcnt_tracker, tracker);
4099 #endif
4100 }
4101 
netdev_hold(struct net_device * dev,netdevice_tracker * tracker,gfp_t gfp)4102 static inline void netdev_hold(struct net_device *dev,
4103 			       netdevice_tracker *tracker, gfp_t gfp)
4104 {
4105 	if (dev) {
4106 		__dev_hold(dev);
4107 		__netdev_tracker_alloc(dev, tracker, gfp);
4108 	}
4109 }
4110 
netdev_put(struct net_device * dev,netdevice_tracker * tracker)4111 static inline void netdev_put(struct net_device *dev,
4112 			      netdevice_tracker *tracker)
4113 {
4114 	if (dev) {
4115 		netdev_tracker_free(dev, tracker);
4116 		__dev_put(dev);
4117 	}
4118 }
4119 
4120 /**
4121  *	dev_hold - get reference to device
4122  *	@dev: network device
4123  *
4124  * Hold reference to device to keep it from being freed.
4125  * Try using netdev_hold() instead.
4126  */
dev_hold(struct net_device * dev)4127 static inline void dev_hold(struct net_device *dev)
4128 {
4129 	netdev_hold(dev, NULL, GFP_ATOMIC);
4130 }
4131 
4132 /**
4133  *	dev_put - release reference to device
4134  *	@dev: network device
4135  *
4136  * Release reference to device to allow it to be freed.
4137  * Try using netdev_put() instead.
4138  */
dev_put(struct net_device * dev)4139 static inline void dev_put(struct net_device *dev)
4140 {
4141 	netdev_put(dev, NULL);
4142 }
4143 
netdev_ref_replace(struct net_device * odev,struct net_device * ndev,netdevice_tracker * tracker,gfp_t gfp)4144 static inline void netdev_ref_replace(struct net_device *odev,
4145 				      struct net_device *ndev,
4146 				      netdevice_tracker *tracker,
4147 				      gfp_t gfp)
4148 {
4149 	if (odev)
4150 		netdev_tracker_free(odev, tracker);
4151 
4152 	__dev_hold(ndev);
4153 	__dev_put(odev);
4154 
4155 	if (ndev)
4156 		__netdev_tracker_alloc(ndev, tracker, gfp);
4157 }
4158 
4159 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
4160  * and _off may be called from IRQ context, but it is caller
4161  * who is responsible for serialization of these calls.
4162  *
4163  * The name carrier is inappropriate, these functions should really be
4164  * called netif_lowerlayer_*() because they represent the state of any
4165  * kind of lower layer not just hardware media.
4166  */
4167 void linkwatch_fire_event(struct net_device *dev);
4168 
4169 /**
4170  *	netif_carrier_ok - test if carrier present
4171  *	@dev: network device
4172  *
4173  * Check if carrier is present on device
4174  */
netif_carrier_ok(const struct net_device * dev)4175 static inline bool netif_carrier_ok(const struct net_device *dev)
4176 {
4177 	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
4178 }
4179 
4180 unsigned long dev_trans_start(struct net_device *dev);
4181 
4182 void __netdev_watchdog_up(struct net_device *dev);
4183 
4184 void netif_carrier_on(struct net_device *dev);
4185 void netif_carrier_off(struct net_device *dev);
4186 void netif_carrier_event(struct net_device *dev);
4187 
4188 /**
4189  *	netif_dormant_on - mark device as dormant.
4190  *	@dev: network device
4191  *
4192  * Mark device as dormant (as per RFC2863).
4193  *
4194  * The dormant state indicates that the relevant interface is not
4195  * actually in a condition to pass packets (i.e., it is not 'up') but is
4196  * in a "pending" state, waiting for some external event.  For "on-
4197  * demand" interfaces, this new state identifies the situation where the
4198  * interface is waiting for events to place it in the up state.
4199  */
netif_dormant_on(struct net_device * dev)4200 static inline void netif_dormant_on(struct net_device *dev)
4201 {
4202 	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
4203 		linkwatch_fire_event(dev);
4204 }
4205 
4206 /**
4207  *	netif_dormant_off - set device as not dormant.
4208  *	@dev: network device
4209  *
4210  * Device is not in dormant state.
4211  */
netif_dormant_off(struct net_device * dev)4212 static inline void netif_dormant_off(struct net_device *dev)
4213 {
4214 	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
4215 		linkwatch_fire_event(dev);
4216 }
4217 
4218 /**
4219  *	netif_dormant - test if device is dormant
4220  *	@dev: network device
4221  *
4222  * Check if device is dormant.
4223  */
netif_dormant(const struct net_device * dev)4224 static inline bool netif_dormant(const struct net_device *dev)
4225 {
4226 	return test_bit(__LINK_STATE_DORMANT, &dev->state);
4227 }
4228 
4229 
4230 /**
4231  *	netif_testing_on - mark device as under test.
4232  *	@dev: network device
4233  *
4234  * Mark device as under test (as per RFC2863).
4235  *
4236  * The testing state indicates that some test(s) must be performed on
4237  * the interface. After completion, of the test, the interface state
4238  * will change to up, dormant, or down, as appropriate.
4239  */
netif_testing_on(struct net_device * dev)4240 static inline void netif_testing_on(struct net_device *dev)
4241 {
4242 	if (!test_and_set_bit(__LINK_STATE_TESTING, &dev->state))
4243 		linkwatch_fire_event(dev);
4244 }
4245 
4246 /**
4247  *	netif_testing_off - set device as not under test.
4248  *	@dev: network device
4249  *
4250  * Device is not in testing state.
4251  */
netif_testing_off(struct net_device * dev)4252 static inline void netif_testing_off(struct net_device *dev)
4253 {
4254 	if (test_and_clear_bit(__LINK_STATE_TESTING, &dev->state))
4255 		linkwatch_fire_event(dev);
4256 }
4257 
4258 /**
4259  *	netif_testing - test if device is under test
4260  *	@dev: network device
4261  *
4262  * Check if device is under test
4263  */
netif_testing(const struct net_device * dev)4264 static inline bool netif_testing(const struct net_device *dev)
4265 {
4266 	return test_bit(__LINK_STATE_TESTING, &dev->state);
4267 }
4268 
4269 
4270 /**
4271  *	netif_oper_up - test if device is operational
4272  *	@dev: network device
4273  *
4274  * Check if carrier is operational
4275  */
netif_oper_up(const struct net_device * dev)4276 static inline bool netif_oper_up(const struct net_device *dev)
4277 {
4278 	return (dev->operstate == IF_OPER_UP ||
4279 		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
4280 }
4281 
4282 /**
4283  *	netif_device_present - is device available or removed
4284  *	@dev: network device
4285  *
4286  * Check if device has not been removed from system.
4287  */
netif_device_present(const struct net_device * dev)4288 static inline bool netif_device_present(const struct net_device *dev)
4289 {
4290 	return test_bit(__LINK_STATE_PRESENT, &dev->state);
4291 }
4292 
4293 void netif_device_detach(struct net_device *dev);
4294 
4295 void netif_device_attach(struct net_device *dev);
4296 
4297 /*
4298  * Network interface message level settings
4299  */
4300 
4301 enum {
4302 	NETIF_MSG_DRV_BIT,
4303 	NETIF_MSG_PROBE_BIT,
4304 	NETIF_MSG_LINK_BIT,
4305 	NETIF_MSG_TIMER_BIT,
4306 	NETIF_MSG_IFDOWN_BIT,
4307 	NETIF_MSG_IFUP_BIT,
4308 	NETIF_MSG_RX_ERR_BIT,
4309 	NETIF_MSG_TX_ERR_BIT,
4310 	NETIF_MSG_TX_QUEUED_BIT,
4311 	NETIF_MSG_INTR_BIT,
4312 	NETIF_MSG_TX_DONE_BIT,
4313 	NETIF_MSG_RX_STATUS_BIT,
4314 	NETIF_MSG_PKTDATA_BIT,
4315 	NETIF_MSG_HW_BIT,
4316 	NETIF_MSG_WOL_BIT,
4317 
4318 	/* When you add a new bit above, update netif_msg_class_names array
4319 	 * in net/ethtool/common.c
4320 	 */
4321 	NETIF_MSG_CLASS_COUNT,
4322 };
4323 /* Both ethtool_ops interface and internal driver implementation use u32 */
4324 static_assert(NETIF_MSG_CLASS_COUNT <= 32);
4325 
4326 #define __NETIF_MSG_BIT(bit)	((u32)1 << (bit))
4327 #define __NETIF_MSG(name)	__NETIF_MSG_BIT(NETIF_MSG_ ## name ## _BIT)
4328 
4329 #define NETIF_MSG_DRV		__NETIF_MSG(DRV)
4330 #define NETIF_MSG_PROBE		__NETIF_MSG(PROBE)
4331 #define NETIF_MSG_LINK		__NETIF_MSG(LINK)
4332 #define NETIF_MSG_TIMER		__NETIF_MSG(TIMER)
4333 #define NETIF_MSG_IFDOWN	__NETIF_MSG(IFDOWN)
4334 #define NETIF_MSG_IFUP		__NETIF_MSG(IFUP)
4335 #define NETIF_MSG_RX_ERR	__NETIF_MSG(RX_ERR)
4336 #define NETIF_MSG_TX_ERR	__NETIF_MSG(TX_ERR)
4337 #define NETIF_MSG_TX_QUEUED	__NETIF_MSG(TX_QUEUED)
4338 #define NETIF_MSG_INTR		__NETIF_MSG(INTR)
4339 #define NETIF_MSG_TX_DONE	__NETIF_MSG(TX_DONE)
4340 #define NETIF_MSG_RX_STATUS	__NETIF_MSG(RX_STATUS)
4341 #define NETIF_MSG_PKTDATA	__NETIF_MSG(PKTDATA)
4342 #define NETIF_MSG_HW		__NETIF_MSG(HW)
4343 #define NETIF_MSG_WOL		__NETIF_MSG(WOL)
4344 
4345 #define netif_msg_drv(p)	((p)->msg_enable & NETIF_MSG_DRV)
4346 #define netif_msg_probe(p)	((p)->msg_enable & NETIF_MSG_PROBE)
4347 #define netif_msg_link(p)	((p)->msg_enable & NETIF_MSG_LINK)
4348 #define netif_msg_timer(p)	((p)->msg_enable & NETIF_MSG_TIMER)
4349 #define netif_msg_ifdown(p)	((p)->msg_enable & NETIF_MSG_IFDOWN)
4350 #define netif_msg_ifup(p)	((p)->msg_enable & NETIF_MSG_IFUP)
4351 #define netif_msg_rx_err(p)	((p)->msg_enable & NETIF_MSG_RX_ERR)
4352 #define netif_msg_tx_err(p)	((p)->msg_enable & NETIF_MSG_TX_ERR)
4353 #define netif_msg_tx_queued(p)	((p)->msg_enable & NETIF_MSG_TX_QUEUED)
4354 #define netif_msg_intr(p)	((p)->msg_enable & NETIF_MSG_INTR)
4355 #define netif_msg_tx_done(p)	((p)->msg_enable & NETIF_MSG_TX_DONE)
4356 #define netif_msg_rx_status(p)	((p)->msg_enable & NETIF_MSG_RX_STATUS)
4357 #define netif_msg_pktdata(p)	((p)->msg_enable & NETIF_MSG_PKTDATA)
4358 #define netif_msg_hw(p)		((p)->msg_enable & NETIF_MSG_HW)
4359 #define netif_msg_wol(p)	((p)->msg_enable & NETIF_MSG_WOL)
4360 
netif_msg_init(int debug_value,int default_msg_enable_bits)4361 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
4362 {
4363 	/* use default */
4364 	if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
4365 		return default_msg_enable_bits;
4366 	if (debug_value == 0)	/* no output */
4367 		return 0;
4368 	/* set low N bits */
4369 	return (1U << debug_value) - 1;
4370 }
4371 
__netif_tx_lock(struct netdev_queue * txq,int cpu)4372 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
4373 {
4374 	spin_lock(&txq->_xmit_lock);
4375 	/* Pairs with READ_ONCE() in __dev_queue_xmit() */
4376 	WRITE_ONCE(txq->xmit_lock_owner, cpu);
4377 }
4378 
__netif_tx_acquire(struct netdev_queue * txq)4379 static inline bool __netif_tx_acquire(struct netdev_queue *txq)
4380 {
4381 	__acquire(&txq->_xmit_lock);
4382 	return true;
4383 }
4384 
__netif_tx_release(struct netdev_queue * txq)4385 static inline void __netif_tx_release(struct netdev_queue *txq)
4386 {
4387 	__release(&txq->_xmit_lock);
4388 }
4389 
__netif_tx_lock_bh(struct netdev_queue * txq)4390 static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
4391 {
4392 	spin_lock_bh(&txq->_xmit_lock);
4393 	/* Pairs with READ_ONCE() in __dev_queue_xmit() */
4394 	WRITE_ONCE(txq->xmit_lock_owner, smp_processor_id());
4395 }
4396 
__netif_tx_trylock(struct netdev_queue * txq)4397 static inline bool __netif_tx_trylock(struct netdev_queue *txq)
4398 {
4399 	bool ok = spin_trylock(&txq->_xmit_lock);
4400 
4401 	if (likely(ok)) {
4402 		/* Pairs with READ_ONCE() in __dev_queue_xmit() */
4403 		WRITE_ONCE(txq->xmit_lock_owner, smp_processor_id());
4404 	}
4405 	return ok;
4406 }
4407 
__netif_tx_unlock(struct netdev_queue * txq)4408 static inline void __netif_tx_unlock(struct netdev_queue *txq)
4409 {
4410 	/* Pairs with READ_ONCE() in __dev_queue_xmit() */
4411 	WRITE_ONCE(txq->xmit_lock_owner, -1);
4412 	spin_unlock(&txq->_xmit_lock);
4413 }
4414 
__netif_tx_unlock_bh(struct netdev_queue * txq)4415 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
4416 {
4417 	/* Pairs with READ_ONCE() in __dev_queue_xmit() */
4418 	WRITE_ONCE(txq->xmit_lock_owner, -1);
4419 	spin_unlock_bh(&txq->_xmit_lock);
4420 }
4421 
4422 /*
4423  * txq->trans_start can be read locklessly from dev_watchdog()
4424  */
txq_trans_update(struct netdev_queue * txq)4425 static inline void txq_trans_update(struct netdev_queue *txq)
4426 {
4427 	if (txq->xmit_lock_owner != -1)
4428 		WRITE_ONCE(txq->trans_start, jiffies);
4429 }
4430 
txq_trans_cond_update(struct netdev_queue * txq)4431 static inline void txq_trans_cond_update(struct netdev_queue *txq)
4432 {
4433 	unsigned long now = jiffies;
4434 
4435 	if (READ_ONCE(txq->trans_start) != now)
4436 		WRITE_ONCE(txq->trans_start, now);
4437 }
4438 
4439 /* legacy drivers only, netdev_start_xmit() sets txq->trans_start */
netif_trans_update(struct net_device * dev)4440 static inline void netif_trans_update(struct net_device *dev)
4441 {
4442 	struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
4443 
4444 	txq_trans_cond_update(txq);
4445 }
4446 
4447 /**
4448  *	netif_tx_lock - grab network device transmit lock
4449  *	@dev: network device
4450  *
4451  * Get network device transmit lock
4452  */
4453 void netif_tx_lock(struct net_device *dev);
4454 
netif_tx_lock_bh(struct net_device * dev)4455 static inline void netif_tx_lock_bh(struct net_device *dev)
4456 {
4457 	local_bh_disable();
4458 	netif_tx_lock(dev);
4459 }
4460 
4461 void netif_tx_unlock(struct net_device *dev);
4462 
netif_tx_unlock_bh(struct net_device * dev)4463 static inline void netif_tx_unlock_bh(struct net_device *dev)
4464 {
4465 	netif_tx_unlock(dev);
4466 	local_bh_enable();
4467 }
4468 
4469 #define HARD_TX_LOCK(dev, txq, cpu) {			\
4470 	if ((dev->features & NETIF_F_LLTX) == 0) {	\
4471 		__netif_tx_lock(txq, cpu);		\
4472 	} else {					\
4473 		__netif_tx_acquire(txq);		\
4474 	}						\
4475 }
4476 
4477 #define HARD_TX_TRYLOCK(dev, txq)			\
4478 	(((dev->features & NETIF_F_LLTX) == 0) ?	\
4479 		__netif_tx_trylock(txq) :		\
4480 		__netif_tx_acquire(txq))
4481 
4482 #define HARD_TX_UNLOCK(dev, txq) {			\
4483 	if ((dev->features & NETIF_F_LLTX) == 0) {	\
4484 		__netif_tx_unlock(txq);			\
4485 	} else {					\
4486 		__netif_tx_release(txq);		\
4487 	}						\
4488 }
4489 
netif_tx_disable(struct net_device * dev)4490 static inline void netif_tx_disable(struct net_device *dev)
4491 {
4492 	unsigned int i;
4493 	int cpu;
4494 
4495 	local_bh_disable();
4496 	cpu = smp_processor_id();
4497 	spin_lock(&dev->tx_global_lock);
4498 	for (i = 0; i < dev->num_tx_queues; i++) {
4499 		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
4500 
4501 		__netif_tx_lock(txq, cpu);
4502 		netif_tx_stop_queue(txq);
4503 		__netif_tx_unlock(txq);
4504 	}
4505 	spin_unlock(&dev->tx_global_lock);
4506 	local_bh_enable();
4507 }
4508 
netif_addr_lock(struct net_device * dev)4509 static inline void netif_addr_lock(struct net_device *dev)
4510 {
4511 	unsigned char nest_level = 0;
4512 
4513 #ifdef CONFIG_LOCKDEP
4514 	nest_level = dev->nested_level;
4515 #endif
4516 	spin_lock_nested(&dev->addr_list_lock, nest_level);
4517 }
4518 
netif_addr_lock_bh(struct net_device * dev)4519 static inline void netif_addr_lock_bh(struct net_device *dev)
4520 {
4521 	unsigned char nest_level = 0;
4522 
4523 #ifdef CONFIG_LOCKDEP
4524 	nest_level = dev->nested_level;
4525 #endif
4526 	local_bh_disable();
4527 	spin_lock_nested(&dev->addr_list_lock, nest_level);
4528 }
4529 
netif_addr_unlock(struct net_device * dev)4530 static inline void netif_addr_unlock(struct net_device *dev)
4531 {
4532 	spin_unlock(&dev->addr_list_lock);
4533 }
4534 
netif_addr_unlock_bh(struct net_device * dev)4535 static inline void netif_addr_unlock_bh(struct net_device *dev)
4536 {
4537 	spin_unlock_bh(&dev->addr_list_lock);
4538 }
4539 
4540 /*
4541  * dev_addrs walker. Should be used only for read access. Call with
4542  * rcu_read_lock held.
4543  */
4544 #define for_each_dev_addr(dev, ha) \
4545 		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
4546 
4547 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
4548 
4549 void ether_setup(struct net_device *dev);
4550 
4551 /* Support for loadable net-drivers */
4552 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
4553 				    unsigned char name_assign_type,
4554 				    void (*setup)(struct net_device *),
4555 				    unsigned int txqs, unsigned int rxqs);
4556 #define alloc_netdev(sizeof_priv, name, name_assign_type, setup) \
4557 	alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, 1, 1)
4558 
4559 #define alloc_netdev_mq(sizeof_priv, name, name_assign_type, setup, count) \
4560 	alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, count, \
4561 			 count)
4562 
4563 int register_netdev(struct net_device *dev);
4564 void unregister_netdev(struct net_device *dev);
4565 
4566 int devm_register_netdev(struct device *dev, struct net_device *ndev);
4567 
4568 /* General hardware address lists handling functions */
4569 int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
4570 		   struct netdev_hw_addr_list *from_list, int addr_len);
4571 void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
4572 		      struct netdev_hw_addr_list *from_list, int addr_len);
4573 int __hw_addr_sync_dev(struct netdev_hw_addr_list *list,
4574 		       struct net_device *dev,
4575 		       int (*sync)(struct net_device *, const unsigned char *),
4576 		       int (*unsync)(struct net_device *,
4577 				     const unsigned char *));
4578 int __hw_addr_ref_sync_dev(struct netdev_hw_addr_list *list,
4579 			   struct net_device *dev,
4580 			   int (*sync)(struct net_device *,
4581 				       const unsigned char *, int),
4582 			   int (*unsync)(struct net_device *,
4583 					 const unsigned char *, int));
4584 void __hw_addr_ref_unsync_dev(struct netdev_hw_addr_list *list,
4585 			      struct net_device *dev,
4586 			      int (*unsync)(struct net_device *,
4587 					    const unsigned char *, int));
4588 void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list,
4589 			  struct net_device *dev,
4590 			  int (*unsync)(struct net_device *,
4591 					const unsigned char *));
4592 void __hw_addr_init(struct netdev_hw_addr_list *list);
4593 
4594 /* Functions used for device addresses handling */
4595 void dev_addr_mod(struct net_device *dev, unsigned int offset,
4596 		  const void *addr, size_t len);
4597 
4598 static inline void
__dev_addr_set(struct net_device * dev,const void * addr,size_t len)4599 __dev_addr_set(struct net_device *dev, const void *addr, size_t len)
4600 {
4601 	dev_addr_mod(dev, 0, addr, len);
4602 }
4603 
dev_addr_set(struct net_device * dev,const u8 * addr)4604 static inline void dev_addr_set(struct net_device *dev, const u8 *addr)
4605 {
4606 	__dev_addr_set(dev, addr, dev->addr_len);
4607 }
4608 
4609 int dev_addr_add(struct net_device *dev, const unsigned char *addr,
4610 		 unsigned char addr_type);
4611 int dev_addr_del(struct net_device *dev, const unsigned char *addr,
4612 		 unsigned char addr_type);
4613 
4614 /* Functions used for unicast addresses handling */
4615 int dev_uc_add(struct net_device *dev, const unsigned char *addr);
4616 int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr);
4617 int dev_uc_del(struct net_device *dev, const unsigned char *addr);
4618 int dev_uc_sync(struct net_device *to, struct net_device *from);
4619 int dev_uc_sync_multiple(struct net_device *to, struct net_device *from);
4620 void dev_uc_unsync(struct net_device *to, struct net_device *from);
4621 void dev_uc_flush(struct net_device *dev);
4622 void dev_uc_init(struct net_device *dev);
4623 
4624 /**
4625  *  __dev_uc_sync - Synchonize device's unicast list
4626  *  @dev:  device to sync
4627  *  @sync: function to call if address should be added
4628  *  @unsync: function to call if address should be removed
4629  *
4630  *  Add newly added addresses to the interface, and release
4631  *  addresses that have been deleted.
4632  */
__dev_uc_sync(struct net_device * dev,int (* sync)(struct net_device *,const unsigned char *),int (* unsync)(struct net_device *,const unsigned char *))4633 static inline int __dev_uc_sync(struct net_device *dev,
4634 				int (*sync)(struct net_device *,
4635 					    const unsigned char *),
4636 				int (*unsync)(struct net_device *,
4637 					      const unsigned char *))
4638 {
4639 	return __hw_addr_sync_dev(&dev->uc, dev, sync, unsync);
4640 }
4641 
4642 /**
4643  *  __dev_uc_unsync - Remove synchronized addresses from device
4644  *  @dev:  device to sync
4645  *  @unsync: function to call if address should be removed
4646  *
4647  *  Remove all addresses that were added to the device by dev_uc_sync().
4648  */
__dev_uc_unsync(struct net_device * dev,int (* unsync)(struct net_device *,const unsigned char *))4649 static inline void __dev_uc_unsync(struct net_device *dev,
4650 				   int (*unsync)(struct net_device *,
4651 						 const unsigned char *))
4652 {
4653 	__hw_addr_unsync_dev(&dev->uc, dev, unsync);
4654 }
4655 
4656 /* Functions used for multicast addresses handling */
4657 int dev_mc_add(struct net_device *dev, const unsigned char *addr);
4658 int dev_mc_add_global(struct net_device *dev, const unsigned char *addr);
4659 int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr);
4660 int dev_mc_del(struct net_device *dev, const unsigned char *addr);
4661 int dev_mc_del_global(struct net_device *dev, const unsigned char *addr);
4662 int dev_mc_sync(struct net_device *to, struct net_device *from);
4663 int dev_mc_sync_multiple(struct net_device *to, struct net_device *from);
4664 void dev_mc_unsync(struct net_device *to, struct net_device *from);
4665 void dev_mc_flush(struct net_device *dev);
4666 void dev_mc_init(struct net_device *dev);
4667 
4668 /**
4669  *  __dev_mc_sync - Synchonize device's multicast list
4670  *  @dev:  device to sync
4671  *  @sync: function to call if address should be added
4672  *  @unsync: function to call if address should be removed
4673  *
4674  *  Add newly added addresses to the interface, and release
4675  *  addresses that have been deleted.
4676  */
__dev_mc_sync(struct net_device * dev,int (* sync)(struct net_device *,const unsigned char *),int (* unsync)(struct net_device *,const unsigned char *))4677 static inline int __dev_mc_sync(struct net_device *dev,
4678 				int (*sync)(struct net_device *,
4679 					    const unsigned char *),
4680 				int (*unsync)(struct net_device *,
4681 					      const unsigned char *))
4682 {
4683 	return __hw_addr_sync_dev(&dev->mc, dev, sync, unsync);
4684 }
4685 
4686 /**
4687  *  __dev_mc_unsync - Remove synchronized addresses from device
4688  *  @dev:  device to sync
4689  *  @unsync: function to call if address should be removed
4690  *
4691  *  Remove all addresses that were added to the device by dev_mc_sync().
4692  */
__dev_mc_unsync(struct net_device * dev,int (* unsync)(struct net_device *,const unsigned char *))4693 static inline void __dev_mc_unsync(struct net_device *dev,
4694 				   int (*unsync)(struct net_device *,
4695 						 const unsigned char *))
4696 {
4697 	__hw_addr_unsync_dev(&dev->mc, dev, unsync);
4698 }
4699 
4700 /* Functions used for secondary unicast and multicast support */
4701 void dev_set_rx_mode(struct net_device *dev);
4702 int dev_set_promiscuity(struct net_device *dev, int inc);
4703 int dev_set_allmulti(struct net_device *dev, int inc);
4704 void netdev_state_change(struct net_device *dev);
4705 void __netdev_notify_peers(struct net_device *dev);
4706 void netdev_notify_peers(struct net_device *dev);
4707 void netdev_features_change(struct net_device *dev);
4708 /* Load a device via the kmod */
4709 void dev_load(struct net *net, const char *name);
4710 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
4711 					struct rtnl_link_stats64 *storage);
4712 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
4713 			     const struct net_device_stats *netdev_stats);
4714 void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s,
4715 			   const struct pcpu_sw_netstats __percpu *netstats);
4716 void dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s);
4717 
4718 extern int		netdev_max_backlog;
4719 extern int		dev_rx_weight;
4720 extern int		dev_tx_weight;
4721 extern int		gro_normal_batch;
4722 
4723 enum {
4724 	NESTED_SYNC_IMM_BIT,
4725 	NESTED_SYNC_TODO_BIT,
4726 };
4727 
4728 #define __NESTED_SYNC_BIT(bit)	((u32)1 << (bit))
4729 #define __NESTED_SYNC(name)	__NESTED_SYNC_BIT(NESTED_SYNC_ ## name ## _BIT)
4730 
4731 #define NESTED_SYNC_IMM		__NESTED_SYNC(IMM)
4732 #define NESTED_SYNC_TODO	__NESTED_SYNC(TODO)
4733 
4734 struct netdev_nested_priv {
4735 	unsigned char flags;
4736 	void *data;
4737 };
4738 
4739 bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev);
4740 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
4741 						     struct list_head **iter);
4742 
4743 /* iterate through upper list, must be called under RCU read lock */
4744 #define netdev_for_each_upper_dev_rcu(dev, updev, iter) \
4745 	for (iter = &(dev)->adj_list.upper, \
4746 	     updev = netdev_upper_get_next_dev_rcu(dev, &(iter)); \
4747 	     updev; \
4748 	     updev = netdev_upper_get_next_dev_rcu(dev, &(iter)))
4749 
4750 int netdev_walk_all_upper_dev_rcu(struct net_device *dev,
4751 				  int (*fn)(struct net_device *upper_dev,
4752 					    struct netdev_nested_priv *priv),
4753 				  struct netdev_nested_priv *priv);
4754 
4755 bool netdev_has_upper_dev_all_rcu(struct net_device *dev,
4756 				  struct net_device *upper_dev);
4757 
4758 bool netdev_has_any_upper_dev(struct net_device *dev);
4759 
4760 void *netdev_lower_get_next_private(struct net_device *dev,
4761 				    struct list_head **iter);
4762 void *netdev_lower_get_next_private_rcu(struct net_device *dev,
4763 					struct list_head **iter);
4764 
4765 #define netdev_for_each_lower_private(dev, priv, iter) \
4766 	for (iter = (dev)->adj_list.lower.next, \
4767 	     priv = netdev_lower_get_next_private(dev, &(iter)); \
4768 	     priv; \
4769 	     priv = netdev_lower_get_next_private(dev, &(iter)))
4770 
4771 #define netdev_for_each_lower_private_rcu(dev, priv, iter) \
4772 	for (iter = &(dev)->adj_list.lower, \
4773 	     priv = netdev_lower_get_next_private_rcu(dev, &(iter)); \
4774 	     priv; \
4775 	     priv = netdev_lower_get_next_private_rcu(dev, &(iter)))
4776 
4777 void *netdev_lower_get_next(struct net_device *dev,
4778 				struct list_head **iter);
4779 
4780 #define netdev_for_each_lower_dev(dev, ldev, iter) \
4781 	for (iter = (dev)->adj_list.lower.next, \
4782 	     ldev = netdev_lower_get_next(dev, &(iter)); \
4783 	     ldev; \
4784 	     ldev = netdev_lower_get_next(dev, &(iter)))
4785 
4786 struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev,
4787 					     struct list_head **iter);
4788 int netdev_walk_all_lower_dev(struct net_device *dev,
4789 			      int (*fn)(struct net_device *lower_dev,
4790 					struct netdev_nested_priv *priv),
4791 			      struct netdev_nested_priv *priv);
4792 int netdev_walk_all_lower_dev_rcu(struct net_device *dev,
4793 				  int (*fn)(struct net_device *lower_dev,
4794 					    struct netdev_nested_priv *priv),
4795 				  struct netdev_nested_priv *priv);
4796 
4797 void *netdev_adjacent_get_private(struct list_head *adj_list);
4798 void *netdev_lower_get_first_private_rcu(struct net_device *dev);
4799 struct net_device *netdev_master_upper_dev_get(struct net_device *dev);
4800 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev);
4801 int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev,
4802 			  struct netlink_ext_ack *extack);
4803 int netdev_master_upper_dev_link(struct net_device *dev,
4804 				 struct net_device *upper_dev,
4805 				 void *upper_priv, void *upper_info,
4806 				 struct netlink_ext_ack *extack);
4807 void netdev_upper_dev_unlink(struct net_device *dev,
4808 			     struct net_device *upper_dev);
4809 int netdev_adjacent_change_prepare(struct net_device *old_dev,
4810 				   struct net_device *new_dev,
4811 				   struct net_device *dev,
4812 				   struct netlink_ext_ack *extack);
4813 void netdev_adjacent_change_commit(struct net_device *old_dev,
4814 				   struct net_device *new_dev,
4815 				   struct net_device *dev);
4816 void netdev_adjacent_change_abort(struct net_device *old_dev,
4817 				  struct net_device *new_dev,
4818 				  struct net_device *dev);
4819 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
4820 void *netdev_lower_dev_get_private(struct net_device *dev,
4821 				   struct net_device *lower_dev);
4822 void netdev_lower_state_changed(struct net_device *lower_dev,
4823 				void *lower_state_info);
4824 
4825 /* RSS keys are 40 or 52 bytes long */
4826 #define NETDEV_RSS_KEY_LEN 52
4827 extern u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly;
4828 void netdev_rss_key_fill(void *buffer, size_t len);
4829 
4830 int skb_checksum_help(struct sk_buff *skb);
4831 int skb_crc32c_csum_help(struct sk_buff *skb);
4832 int skb_csum_hwoffload_help(struct sk_buff *skb,
4833 			    const netdev_features_t features);
4834 
4835 struct netdev_bonding_info {
4836 	ifslave	slave;
4837 	ifbond	master;
4838 };
4839 
4840 struct netdev_notifier_bonding_info {
4841 	struct netdev_notifier_info info; /* must be first */
4842 	struct netdev_bonding_info  bonding_info;
4843 };
4844 
4845 void netdev_bonding_info_change(struct net_device *dev,
4846 				struct netdev_bonding_info *bonding_info);
4847 
4848 #if IS_ENABLED(CONFIG_ETHTOOL_NETLINK)
4849 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data);
4850 #else
ethtool_notify(struct net_device * dev,unsigned int cmd,const void * data)4851 static inline void ethtool_notify(struct net_device *dev, unsigned int cmd,
4852 				  const void *data)
4853 {
4854 }
4855 #endif
4856 
4857 __be16 skb_network_protocol(struct sk_buff *skb, int *depth);
4858 
can_checksum_protocol(netdev_features_t features,__be16 protocol)4859 static inline bool can_checksum_protocol(netdev_features_t features,
4860 					 __be16 protocol)
4861 {
4862 	if (protocol == htons(ETH_P_FCOE))
4863 		return !!(features & NETIF_F_FCOE_CRC);
4864 
4865 	/* Assume this is an IP checksum (not SCTP CRC) */
4866 
4867 	if (features & NETIF_F_HW_CSUM) {
4868 		/* Can checksum everything */
4869 		return true;
4870 	}
4871 
4872 	switch (protocol) {
4873 	case htons(ETH_P_IP):
4874 		return !!(features & NETIF_F_IP_CSUM);
4875 	case htons(ETH_P_IPV6):
4876 		return !!(features & NETIF_F_IPV6_CSUM);
4877 	default:
4878 		return false;
4879 	}
4880 }
4881 
4882 #ifdef CONFIG_BUG
4883 void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb);
4884 #else
netdev_rx_csum_fault(struct net_device * dev,struct sk_buff * skb)4885 static inline void netdev_rx_csum_fault(struct net_device *dev,
4886 					struct sk_buff *skb)
4887 {
4888 }
4889 #endif
4890 /* rx skb timestamps */
4891 void net_enable_timestamp(void);
4892 void net_disable_timestamp(void);
4893 
netdev_get_tstamp(struct net_device * dev,const struct skb_shared_hwtstamps * hwtstamps,bool cycles)4894 static inline ktime_t netdev_get_tstamp(struct net_device *dev,
4895 					const struct skb_shared_hwtstamps *hwtstamps,
4896 					bool cycles)
4897 {
4898 	const struct net_device_ops *ops = dev->netdev_ops;
4899 
4900 	if (ops->ndo_get_tstamp)
4901 		return ops->ndo_get_tstamp(dev, hwtstamps, cycles);
4902 
4903 	return hwtstamps->hwtstamp;
4904 }
4905 
__netdev_start_xmit(const struct net_device_ops * ops,struct sk_buff * skb,struct net_device * dev,bool more)4906 static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
4907 					      struct sk_buff *skb, struct net_device *dev,
4908 					      bool more)
4909 {
4910 	__this_cpu_write(softnet_data.xmit.more, more);
4911 	return ops->ndo_start_xmit(skb, dev);
4912 }
4913 
netdev_xmit_more(void)4914 static inline bool netdev_xmit_more(void)
4915 {
4916 	return __this_cpu_read(softnet_data.xmit.more);
4917 }
4918 
netdev_start_xmit(struct sk_buff * skb,struct net_device * dev,struct netdev_queue * txq,bool more)4919 static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev,
4920 					    struct netdev_queue *txq, bool more)
4921 {
4922 	const struct net_device_ops *ops = dev->netdev_ops;
4923 	netdev_tx_t rc;
4924 
4925 	rc = __netdev_start_xmit(ops, skb, dev, more);
4926 	if (rc == NETDEV_TX_OK)
4927 		txq_trans_update(txq);
4928 
4929 	return rc;
4930 }
4931 
4932 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
4933 				const void *ns);
4934 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
4935 				 const void *ns);
4936 
4937 extern const struct kobj_ns_type_operations net_ns_type_operations;
4938 
4939 const char *netdev_drivername(const struct net_device *dev);
4940 
netdev_intersect_features(netdev_features_t f1,netdev_features_t f2)4941 static inline netdev_features_t netdev_intersect_features(netdev_features_t f1,
4942 							  netdev_features_t f2)
4943 {
4944 	if ((f1 ^ f2) & NETIF_F_HW_CSUM) {
4945 		if (f1 & NETIF_F_HW_CSUM)
4946 			f1 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4947 		else
4948 			f2 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4949 	}
4950 
4951 	return f1 & f2;
4952 }
4953 
netdev_get_wanted_features(struct net_device * dev)4954 static inline netdev_features_t netdev_get_wanted_features(
4955 	struct net_device *dev)
4956 {
4957 	return (dev->features & ~dev->hw_features) | dev->wanted_features;
4958 }
4959 netdev_features_t netdev_increment_features(netdev_features_t all,
4960 	netdev_features_t one, netdev_features_t mask);
4961 
4962 /* Allow TSO being used on stacked device :
4963  * Performing the GSO segmentation before last device
4964  * is a performance improvement.
4965  */
netdev_add_tso_features(netdev_features_t features,netdev_features_t mask)4966 static inline netdev_features_t netdev_add_tso_features(netdev_features_t features,
4967 							netdev_features_t mask)
4968 {
4969 	return netdev_increment_features(features, NETIF_F_ALL_TSO, mask);
4970 }
4971 
4972 int __netdev_update_features(struct net_device *dev);
4973 void netdev_update_features(struct net_device *dev);
4974 void netdev_change_features(struct net_device *dev);
4975 
4976 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4977 					struct net_device *dev);
4978 
4979 netdev_features_t passthru_features_check(struct sk_buff *skb,
4980 					  struct net_device *dev,
4981 					  netdev_features_t features);
4982 netdev_features_t netif_skb_features(struct sk_buff *skb);
4983 void skb_warn_bad_offload(const struct sk_buff *skb);
4984 
net_gso_ok(netdev_features_t features,int gso_type)4985 static inline bool net_gso_ok(netdev_features_t features, int gso_type)
4986 {
4987 	netdev_features_t feature = (netdev_features_t)gso_type << NETIF_F_GSO_SHIFT;
4988 
4989 	/* check flags correspondence */
4990 	BUILD_BUG_ON(SKB_GSO_TCPV4   != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
4991 	BUILD_BUG_ON(SKB_GSO_DODGY   != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
4992 	BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
4993 	BUILD_BUG_ON(SKB_GSO_TCP_FIXEDID != (NETIF_F_TSO_MANGLEID >> NETIF_F_GSO_SHIFT));
4994 	BUILD_BUG_ON(SKB_GSO_TCPV6   != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
4995 	BUILD_BUG_ON(SKB_GSO_FCOE    != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));
4996 	BUILD_BUG_ON(SKB_GSO_GRE     != (NETIF_F_GSO_GRE >> NETIF_F_GSO_SHIFT));
4997 	BUILD_BUG_ON(SKB_GSO_GRE_CSUM != (NETIF_F_GSO_GRE_CSUM >> NETIF_F_GSO_SHIFT));
4998 	BUILD_BUG_ON(SKB_GSO_IPXIP4  != (NETIF_F_GSO_IPXIP4 >> NETIF_F_GSO_SHIFT));
4999 	BUILD_BUG_ON(SKB_GSO_IPXIP6  != (NETIF_F_GSO_IPXIP6 >> NETIF_F_GSO_SHIFT));
5000 	BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL != (NETIF_F_GSO_UDP_TUNNEL >> NETIF_F_GSO_SHIFT));
5001 	BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL_CSUM != (NETIF_F_GSO_UDP_TUNNEL_CSUM >> NETIF_F_GSO_SHIFT));
5002 	BUILD_BUG_ON(SKB_GSO_PARTIAL != (NETIF_F_GSO_PARTIAL >> NETIF_F_GSO_SHIFT));
5003 	BUILD_BUG_ON(SKB_GSO_TUNNEL_REMCSUM != (NETIF_F_GSO_TUNNEL_REMCSUM >> NETIF_F_GSO_SHIFT));
5004 	BUILD_BUG_ON(SKB_GSO_SCTP    != (NETIF_F_GSO_SCTP >> NETIF_F_GSO_SHIFT));
5005 	BUILD_BUG_ON(SKB_GSO_ESP != (NETIF_F_GSO_ESP >> NETIF_F_GSO_SHIFT));
5006 	BUILD_BUG_ON(SKB_GSO_UDP != (NETIF_F_GSO_UDP >> NETIF_F_GSO_SHIFT));
5007 	BUILD_BUG_ON(SKB_GSO_UDP_L4 != (NETIF_F_GSO_UDP_L4 >> NETIF_F_GSO_SHIFT));
5008 	BUILD_BUG_ON(SKB_GSO_FRAGLIST != (NETIF_F_GSO_FRAGLIST >> NETIF_F_GSO_SHIFT));
5009 
5010 	return (features & feature) == feature;
5011 }
5012 
skb_gso_ok(struct sk_buff * skb,netdev_features_t features)5013 static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
5014 {
5015 	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
5016 	       (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
5017 }
5018 
netif_needs_gso(struct sk_buff * skb,netdev_features_t features)5019 static inline bool netif_needs_gso(struct sk_buff *skb,
5020 				   netdev_features_t features)
5021 {
5022 	return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
5023 		unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
5024 			 (skb->ip_summed != CHECKSUM_UNNECESSARY)));
5025 }
5026 
5027 void netif_set_tso_max_size(struct net_device *dev, unsigned int size);
5028 void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs);
5029 void netif_inherit_tso_max(struct net_device *to,
5030 			   const struct net_device *from);
5031 
netif_is_macsec(const struct net_device * dev)5032 static inline bool netif_is_macsec(const struct net_device *dev)
5033 {
5034 	return dev->priv_flags & IFF_MACSEC;
5035 }
5036 
netif_is_macvlan(const struct net_device * dev)5037 static inline bool netif_is_macvlan(const struct net_device *dev)
5038 {
5039 	return dev->priv_flags & IFF_MACVLAN;
5040 }
5041 
netif_is_macvlan_port(const struct net_device * dev)5042 static inline bool netif_is_macvlan_port(const struct net_device *dev)
5043 {
5044 	return dev->priv_flags & IFF_MACVLAN_PORT;
5045 }
5046 
netif_is_bond_master(const struct net_device * dev)5047 static inline bool netif_is_bond_master(const struct net_device *dev)
5048 {
5049 	return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING;
5050 }
5051 
netif_is_bond_slave(const struct net_device * dev)5052 static inline bool netif_is_bond_slave(const struct net_device *dev)
5053 {
5054 	return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
5055 }
5056 
netif_supports_nofcs(struct net_device * dev)5057 static inline bool netif_supports_nofcs(struct net_device *dev)
5058 {
5059 	return dev->priv_flags & IFF_SUPP_NOFCS;
5060 }
5061 
netif_has_l3_rx_handler(const struct net_device * dev)5062 static inline bool netif_has_l3_rx_handler(const struct net_device *dev)
5063 {
5064 	return dev->priv_flags & IFF_L3MDEV_RX_HANDLER;
5065 }
5066 
netif_is_l3_master(const struct net_device * dev)5067 static inline bool netif_is_l3_master(const struct net_device *dev)
5068 {
5069 	return dev->priv_flags & IFF_L3MDEV_MASTER;
5070 }
5071 
netif_is_l3_slave(const struct net_device * dev)5072 static inline bool netif_is_l3_slave(const struct net_device *dev)
5073 {
5074 	return dev->priv_flags & IFF_L3MDEV_SLAVE;
5075 }
5076 
dev_sdif(const struct net_device * dev)5077 static inline int dev_sdif(const struct net_device *dev)
5078 {
5079 #ifdef CONFIG_NET_L3_MASTER_DEV
5080 	if (netif_is_l3_slave(dev))
5081 		return dev->ifindex;
5082 #endif
5083 	return 0;
5084 }
5085 
netif_is_bridge_master(const struct net_device * dev)5086 static inline bool netif_is_bridge_master(const struct net_device *dev)
5087 {
5088 	return dev->priv_flags & IFF_EBRIDGE;
5089 }
5090 
netif_is_bridge_port(const struct net_device * dev)5091 static inline bool netif_is_bridge_port(const struct net_device *dev)
5092 {
5093 	return dev->priv_flags & IFF_BRIDGE_PORT;
5094 }
5095 
netif_is_ovs_master(const struct net_device * dev)5096 static inline bool netif_is_ovs_master(const struct net_device *dev)
5097 {
5098 	return dev->priv_flags & IFF_OPENVSWITCH;
5099 }
5100 
netif_is_ovs_port(const struct net_device * dev)5101 static inline bool netif_is_ovs_port(const struct net_device *dev)
5102 {
5103 	return dev->priv_flags & IFF_OVS_DATAPATH;
5104 }
5105 
netif_is_any_bridge_master(const struct net_device * dev)5106 static inline bool netif_is_any_bridge_master(const struct net_device *dev)
5107 {
5108 	return netif_is_bridge_master(dev) || netif_is_ovs_master(dev);
5109 }
5110 
netif_is_any_bridge_port(const struct net_device * dev)5111 static inline bool netif_is_any_bridge_port(const struct net_device *dev)
5112 {
5113 	return netif_is_bridge_port(dev) || netif_is_ovs_port(dev);
5114 }
5115 
netif_is_team_master(const struct net_device * dev)5116 static inline bool netif_is_team_master(const struct net_device *dev)
5117 {
5118 	return dev->priv_flags & IFF_TEAM;
5119 }
5120 
netif_is_team_port(const struct net_device * dev)5121 static inline bool netif_is_team_port(const struct net_device *dev)
5122 {
5123 	return dev->priv_flags & IFF_TEAM_PORT;
5124 }
5125 
netif_is_lag_master(const struct net_device * dev)5126 static inline bool netif_is_lag_master(const struct net_device *dev)
5127 {
5128 	return netif_is_bond_master(dev) || netif_is_team_master(dev);
5129 }
5130 
netif_is_lag_port(const struct net_device * dev)5131 static inline bool netif_is_lag_port(const struct net_device *dev)
5132 {
5133 	return netif_is_bond_slave(dev) || netif_is_team_port(dev);
5134 }
5135 
netif_is_rxfh_configured(const struct net_device * dev)5136 static inline bool netif_is_rxfh_configured(const struct net_device *dev)
5137 {
5138 	return dev->priv_flags & IFF_RXFH_CONFIGURED;
5139 }
5140 
netif_is_failover(const struct net_device * dev)5141 static inline bool netif_is_failover(const struct net_device *dev)
5142 {
5143 	return dev->priv_flags & IFF_FAILOVER;
5144 }
5145 
netif_is_failover_slave(const struct net_device * dev)5146 static inline bool netif_is_failover_slave(const struct net_device *dev)
5147 {
5148 	return dev->priv_flags & IFF_FAILOVER_SLAVE;
5149 }
5150 
5151 /* This device needs to keep skb dst for qdisc enqueue or ndo_start_xmit() */
netif_keep_dst(struct net_device * dev)5152 static inline void netif_keep_dst(struct net_device *dev)
5153 {
5154 	dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM);
5155 }
5156 
5157 /* return true if dev can't cope with mtu frames that need vlan tag insertion */
netif_reduces_vlan_mtu(struct net_device * dev)5158 static inline bool netif_reduces_vlan_mtu(struct net_device *dev)
5159 {
5160 	/* TODO: reserve and use an additional IFF bit, if we get more users */
5161 	return netif_is_macsec(dev);
5162 }
5163 
5164 extern struct pernet_operations __net_initdata loopback_net_ops;
5165 
5166 /* Logging, debugging and troubleshooting/diagnostic helpers. */
5167 
5168 /* netdev_printk helpers, similar to dev_printk */
5169 
netdev_name(const struct net_device * dev)5170 static inline const char *netdev_name(const struct net_device *dev)
5171 {
5172 	if (!dev->name[0] || strchr(dev->name, '%'))
5173 		return "(unnamed net_device)";
5174 	return dev->name;
5175 }
5176 
netdev_reg_state(const struct net_device * dev)5177 static inline const char *netdev_reg_state(const struct net_device *dev)
5178 {
5179 	switch (dev->reg_state) {
5180 	case NETREG_UNINITIALIZED: return " (uninitialized)";
5181 	case NETREG_REGISTERED: return "";
5182 	case NETREG_UNREGISTERING: return " (unregistering)";
5183 	case NETREG_UNREGISTERED: return " (unregistered)";
5184 	case NETREG_RELEASED: return " (released)";
5185 	case NETREG_DUMMY: return " (dummy)";
5186 	}
5187 
5188 	WARN_ONCE(1, "%s: unknown reg_state %d\n", dev->name, dev->reg_state);
5189 	return " (unknown)";
5190 }
5191 
5192 #define MODULE_ALIAS_NETDEV(device) \
5193 	MODULE_ALIAS("netdev-" device)
5194 
5195 /*
5196  * netdev_WARN() acts like dev_printk(), but with the key difference
5197  * of using a WARN/WARN_ON to get the message out, including the
5198  * file/line information and a backtrace.
5199  */
5200 #define netdev_WARN(dev, format, args...)			\
5201 	WARN(1, "netdevice: %s%s: " format, netdev_name(dev),	\
5202 	     netdev_reg_state(dev), ##args)
5203 
5204 #define netdev_WARN_ONCE(dev, format, args...)				\
5205 	WARN_ONCE(1, "netdevice: %s%s: " format, netdev_name(dev),	\
5206 		  netdev_reg_state(dev), ##args)
5207 
5208 /*
5209  *	The list of packet types we will receive (as opposed to discard)
5210  *	and the routines to invoke.
5211  *
5212  *	Why 16. Because with 16 the only overlap we get on a hash of the
5213  *	low nibble of the protocol value is RARP/SNAP/X.25.
5214  *
5215  *		0800	IP
5216  *		0001	802.3
5217  *		0002	AX.25
5218  *		0004	802.2
5219  *		8035	RARP
5220  *		0005	SNAP
5221  *		0805	X.25
5222  *		0806	ARP
5223  *		8137	IPX
5224  *		0009	Localtalk
5225  *		86DD	IPv6
5226  */
5227 #define PTYPE_HASH_SIZE	(16)
5228 #define PTYPE_HASH_MASK	(PTYPE_HASH_SIZE - 1)
5229 
5230 extern struct list_head ptype_all __read_mostly;
5231 extern struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
5232 
5233 extern struct net_device *blackhole_netdev;
5234 
5235 /* Note: Avoid these macros in fast path, prefer per-cpu or per-queue counters. */
5236 #define DEV_STATS_INC(DEV, FIELD) atomic_long_inc(&(DEV)->stats.__##FIELD)
5237 #define DEV_STATS_ADD(DEV, FIELD, VAL) 	\
5238 		atomic_long_add((VAL), &(DEV)->stats.__##FIELD)
5239 #define DEV_STATS_READ(DEV, FIELD) atomic_long_read(&(DEV)->stats.__##FIELD)
5240 
5241 #endif	/* _LINUX_NETDEVICE_H */
5242