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1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Definitions for the Interfaces handler.
7 *
8 * Version: @(#)dev.h 1.0.10 08/12/93
9 *
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Corey Minyard <wf-rch!minyard@relay.EU.net>
13 * Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
14 * Alan Cox, <alan@lxorguk.ukuu.org.uk>
15 * Bjorn Ekwall. <bj0rn@blox.se>
16 * Pekka Riikonen <priikone@poseidon.pspt.fi>
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 *
23 * Moved to /usr/include/linux for NET3
24 */
25 #ifndef _LINUX_NETDEVICE_H
26 #define _LINUX_NETDEVICE_H
27
28 #include <linux/timer.h>
29 #include <linux/bug.h>
30 #include <linux/delay.h>
31 #include <linux/atomic.h>
32 #include <linux/prefetch.h>
33 #include <asm/cache.h>
34 #include <asm/byteorder.h>
35
36 #include <linux/percpu.h>
37 #include <linux/rculist.h>
38 #include <linux/workqueue.h>
39 #include <linux/dynamic_queue_limits.h>
40
41 #include <linux/ethtool.h>
42 #include <net/net_namespace.h>
43 #ifdef CONFIG_DCB
44 #include <net/dcbnl.h>
45 #endif
46 #include <net/netprio_cgroup.h>
47
48 #include <linux/netdev_features.h>
49 #include <linux/neighbour.h>
50 #include <uapi/linux/netdevice.h>
51 #include <uapi/linux/if_bonding.h>
52 #include <uapi/linux/pkt_cls.h>
53 #include <linux/hashtable.h>
54
55 struct netpoll_info;
56 struct device;
57 struct phy_device;
58 struct dsa_port;
59
60 /* 802.11 specific */
61 struct wireless_dev;
62 /* 802.15.4 specific */
63 struct wpan_dev;
64 struct mpls_dev;
65 /* UDP Tunnel offloads */
66 struct udp_tunnel_info;
67 struct bpf_prog;
68 struct xdp_buff;
69
70 void netdev_set_default_ethtool_ops(struct net_device *dev,
71 const struct ethtool_ops *ops);
72
73 /* Backlog congestion levels */
74 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */
75 #define NET_RX_DROP 1 /* packet dropped */
76
77 /*
78 * Transmit return codes: transmit return codes originate from three different
79 * namespaces:
80 *
81 * - qdisc return codes
82 * - driver transmit return codes
83 * - errno values
84 *
85 * Drivers are allowed to return any one of those in their hard_start_xmit()
86 * function. Real network devices commonly used with qdiscs should only return
87 * the driver transmit return codes though - when qdiscs are used, the actual
88 * transmission happens asynchronously, so the value is not propagated to
89 * higher layers. Virtual network devices transmit synchronously; in this case
90 * the driver transmit return codes are consumed by dev_queue_xmit(), and all
91 * others are propagated to higher layers.
92 */
93
94 /* qdisc ->enqueue() return codes. */
95 #define NET_XMIT_SUCCESS 0x00
96 #define NET_XMIT_DROP 0x01 /* skb dropped */
97 #define NET_XMIT_CN 0x02 /* congestion notification */
98 #define NET_XMIT_MASK 0x0f /* qdisc flags in net/sch_generic.h */
99
100 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
101 * indicates that the device will soon be dropping packets, or already drops
102 * some packets of the same priority; prompting us to send less aggressively. */
103 #define net_xmit_eval(e) ((e) == NET_XMIT_CN ? 0 : (e))
104 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
105
106 /* Driver transmit return codes */
107 #define NETDEV_TX_MASK 0xf0
108
109 enum netdev_tx {
110 __NETDEV_TX_MIN = INT_MIN, /* make sure enum is signed */
111 NETDEV_TX_OK = 0x00, /* driver took care of packet */
112 NETDEV_TX_BUSY = 0x10, /* driver tx path was busy*/
113 };
114 typedef enum netdev_tx netdev_tx_t;
115
116 /*
117 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
118 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
119 */
120 static inline bool dev_xmit_complete(int rc)
121 {
122 /*
123 * Positive cases with an skb consumed by a driver:
124 * - successful transmission (rc == NETDEV_TX_OK)
125 * - error while transmitting (rc < 0)
126 * - error while queueing to a different device (rc & NET_XMIT_MASK)
127 */
128 if (likely(rc < NET_XMIT_MASK))
129 return true;
130
131 return false;
132 }
133
134 /*
135 * Compute the worst-case header length according to the protocols
136 * used.
137 */
138
139 #if defined(CONFIG_HYPERV_NET)
140 # define LL_MAX_HEADER 128
141 #elif defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
142 # if defined(CONFIG_MAC80211_MESH)
143 # define LL_MAX_HEADER 128
144 # else
145 # define LL_MAX_HEADER 96
146 # endif
147 #else
148 # define LL_MAX_HEADER 32
149 #endif
150
151 #if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \
152 !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL)
153 #define MAX_HEADER LL_MAX_HEADER
154 #else
155 #define MAX_HEADER (LL_MAX_HEADER + 48)
156 #endif
157
158 /*
159 * Old network device statistics. Fields are native words
160 * (unsigned long) so they can be read and written atomically.
161 */
162
163 struct net_device_stats {
164 unsigned long rx_packets;
165 unsigned long tx_packets;
166 unsigned long rx_bytes;
167 unsigned long tx_bytes;
168 unsigned long rx_errors;
169 unsigned long tx_errors;
170 unsigned long rx_dropped;
171 unsigned long tx_dropped;
172 unsigned long multicast;
173 unsigned long collisions;
174 unsigned long rx_length_errors;
175 unsigned long rx_over_errors;
176 unsigned long rx_crc_errors;
177 unsigned long rx_frame_errors;
178 unsigned long rx_fifo_errors;
179 unsigned long rx_missed_errors;
180 unsigned long tx_aborted_errors;
181 unsigned long tx_carrier_errors;
182 unsigned long tx_fifo_errors;
183 unsigned long tx_heartbeat_errors;
184 unsigned long tx_window_errors;
185 unsigned long rx_compressed;
186 unsigned long tx_compressed;
187 };
188
189
190 #include <linux/cache.h>
191 #include <linux/skbuff.h>
192
193 #ifdef CONFIG_RPS
194 #include <linux/static_key.h>
195 extern struct static_key rps_needed;
196 extern struct static_key rfs_needed;
197 #endif
198
199 struct neighbour;
200 struct neigh_parms;
201 struct sk_buff;
202
203 struct netdev_hw_addr {
204 struct list_head list;
205 unsigned char addr[MAX_ADDR_LEN];
206 unsigned char type;
207 #define NETDEV_HW_ADDR_T_LAN 1
208 #define NETDEV_HW_ADDR_T_SAN 2
209 #define NETDEV_HW_ADDR_T_SLAVE 3
210 #define NETDEV_HW_ADDR_T_UNICAST 4
211 #define NETDEV_HW_ADDR_T_MULTICAST 5
212 bool global_use;
213 int sync_cnt;
214 int refcount;
215 int synced;
216 struct rcu_head rcu_head;
217 };
218
219 struct netdev_hw_addr_list {
220 struct list_head list;
221 int count;
222 };
223
224 #define netdev_hw_addr_list_count(l) ((l)->count)
225 #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
226 #define netdev_hw_addr_list_for_each(ha, l) \
227 list_for_each_entry(ha, &(l)->list, list)
228
229 #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
230 #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
231 #define netdev_for_each_uc_addr(ha, dev) \
232 netdev_hw_addr_list_for_each(ha, &(dev)->uc)
233
234 #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
235 #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
236 #define netdev_for_each_mc_addr(ha, dev) \
237 netdev_hw_addr_list_for_each(ha, &(dev)->mc)
238
239 struct hh_cache {
240 unsigned int hh_len;
241 seqlock_t hh_lock;
242
243 /* cached hardware header; allow for machine alignment needs. */
244 #define HH_DATA_MOD 16
245 #define HH_DATA_OFF(__len) \
246 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
247 #define HH_DATA_ALIGN(__len) \
248 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
249 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
250 };
251
252 /* Reserve HH_DATA_MOD byte-aligned hard_header_len, but at least that much.
253 * Alternative is:
254 * dev->hard_header_len ? (dev->hard_header_len +
255 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
256 *
257 * We could use other alignment values, but we must maintain the
258 * relationship HH alignment <= LL alignment.
259 */
260 #define LL_RESERVED_SPACE(dev) \
261 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
262 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
263 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
264
265 struct header_ops {
266 int (*create) (struct sk_buff *skb, struct net_device *dev,
267 unsigned short type, const void *daddr,
268 const void *saddr, unsigned int len);
269 int (*parse)(const struct sk_buff *skb, unsigned char *haddr);
270 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type);
271 void (*cache_update)(struct hh_cache *hh,
272 const struct net_device *dev,
273 const unsigned char *haddr);
274 bool (*validate)(const char *ll_header, unsigned int len);
275 };
276
277 /* These flag bits are private to the generic network queueing
278 * layer; they may not be explicitly referenced by any other
279 * code.
280 */
281
282 enum netdev_state_t {
283 __LINK_STATE_START,
284 __LINK_STATE_PRESENT,
285 __LINK_STATE_NOCARRIER,
286 __LINK_STATE_LINKWATCH_PENDING,
287 __LINK_STATE_DORMANT,
288 };
289
290
291 /*
292 * This structure holds boot-time configured netdevice settings. They
293 * are then used in the device probing.
294 */
295 struct netdev_boot_setup {
296 char name[IFNAMSIZ];
297 struct ifmap map;
298 };
299 #define NETDEV_BOOT_SETUP_MAX 8
300
301 int __init netdev_boot_setup(char *str);
302
303 /*
304 * Structure for NAPI scheduling similar to tasklet but with weighting
305 */
306 struct napi_struct {
307 /* The poll_list must only be managed by the entity which
308 * changes the state of the NAPI_STATE_SCHED bit. This means
309 * whoever atomically sets that bit can add this napi_struct
310 * to the per-CPU poll_list, and whoever clears that bit
311 * can remove from the list right before clearing the bit.
312 */
313 struct list_head poll_list;
314
315 unsigned long state;
316 int weight;
317 unsigned int gro_count;
318 int (*poll)(struct napi_struct *, int);
319 #ifdef CONFIG_NETPOLL
320 int poll_owner;
321 #endif
322 struct net_device *dev;
323 struct sk_buff *gro_list;
324 struct sk_buff *skb;
325 struct hrtimer timer;
326 struct list_head dev_list;
327 struct hlist_node napi_hash_node;
328 unsigned int napi_id;
329 };
330
331 enum {
332 NAPI_STATE_SCHED, /* Poll is scheduled */
333 NAPI_STATE_MISSED, /* reschedule a napi */
334 NAPI_STATE_DISABLE, /* Disable pending */
335 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */
336 NAPI_STATE_HASHED, /* In NAPI hash (busy polling possible) */
337 NAPI_STATE_NO_BUSY_POLL,/* Do not add in napi_hash, no busy polling */
338 NAPI_STATE_IN_BUSY_POLL,/* sk_busy_loop() owns this NAPI */
339 };
340
341 enum {
342 NAPIF_STATE_SCHED = BIT(NAPI_STATE_SCHED),
343 NAPIF_STATE_MISSED = BIT(NAPI_STATE_MISSED),
344 NAPIF_STATE_DISABLE = BIT(NAPI_STATE_DISABLE),
345 NAPIF_STATE_NPSVC = BIT(NAPI_STATE_NPSVC),
346 NAPIF_STATE_HASHED = BIT(NAPI_STATE_HASHED),
347 NAPIF_STATE_NO_BUSY_POLL = BIT(NAPI_STATE_NO_BUSY_POLL),
348 NAPIF_STATE_IN_BUSY_POLL = BIT(NAPI_STATE_IN_BUSY_POLL),
349 };
350
351 enum gro_result {
352 GRO_MERGED,
353 GRO_MERGED_FREE,
354 GRO_HELD,
355 GRO_NORMAL,
356 GRO_DROP,
357 GRO_CONSUMED,
358 };
359 typedef enum gro_result gro_result_t;
360
361 /*
362 * enum rx_handler_result - Possible return values for rx_handlers.
363 * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
364 * further.
365 * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
366 * case skb->dev was changed by rx_handler.
367 * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
368 * @RX_HANDLER_PASS: Do nothing, pass the skb as if no rx_handler was called.
369 *
370 * rx_handlers are functions called from inside __netif_receive_skb(), to do
371 * special processing of the skb, prior to delivery to protocol handlers.
372 *
373 * Currently, a net_device can only have a single rx_handler registered. Trying
374 * to register a second rx_handler will return -EBUSY.
375 *
376 * To register a rx_handler on a net_device, use netdev_rx_handler_register().
377 * To unregister a rx_handler on a net_device, use
378 * netdev_rx_handler_unregister().
379 *
380 * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
381 * do with the skb.
382 *
383 * If the rx_handler consumed the skb in some way, it should return
384 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
385 * the skb to be delivered in some other way.
386 *
387 * If the rx_handler changed skb->dev, to divert the skb to another
388 * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
389 * new device will be called if it exists.
390 *
391 * If the rx_handler decides the skb should be ignored, it should return
392 * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
393 * are registered on exact device (ptype->dev == skb->dev).
394 *
395 * If the rx_handler didn't change skb->dev, but wants the skb to be normally
396 * delivered, it should return RX_HANDLER_PASS.
397 *
398 * A device without a registered rx_handler will behave as if rx_handler
399 * returned RX_HANDLER_PASS.
400 */
401
402 enum rx_handler_result {
403 RX_HANDLER_CONSUMED,
404 RX_HANDLER_ANOTHER,
405 RX_HANDLER_EXACT,
406 RX_HANDLER_PASS,
407 };
408 typedef enum rx_handler_result rx_handler_result_t;
409 typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
410
411 void __napi_schedule(struct napi_struct *n);
412 void __napi_schedule_irqoff(struct napi_struct *n);
413
414 static inline bool napi_disable_pending(struct napi_struct *n)
415 {
416 return test_bit(NAPI_STATE_DISABLE, &n->state);
417 }
418
419 bool napi_schedule_prep(struct napi_struct *n);
420
421 /**
422 * napi_schedule - schedule NAPI poll
423 * @n: NAPI context
424 *
425 * Schedule NAPI poll routine to be called if it is not already
426 * running.
427 */
428 static inline void napi_schedule(struct napi_struct *n)
429 {
430 if (napi_schedule_prep(n))
431 __napi_schedule(n);
432 }
433
434 /**
435 * napi_schedule_irqoff - schedule NAPI poll
436 * @n: NAPI context
437 *
438 * Variant of napi_schedule(), assuming hard irqs are masked.
439 */
440 static inline void napi_schedule_irqoff(struct napi_struct *n)
441 {
442 if (napi_schedule_prep(n))
443 __napi_schedule_irqoff(n);
444 }
445
446 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */
447 static inline bool napi_reschedule(struct napi_struct *napi)
448 {
449 if (napi_schedule_prep(napi)) {
450 __napi_schedule(napi);
451 return true;
452 }
453 return false;
454 }
455
456 bool napi_complete_done(struct napi_struct *n, int work_done);
457 /**
458 * napi_complete - NAPI processing complete
459 * @n: NAPI context
460 *
461 * Mark NAPI processing as complete.
462 * Consider using napi_complete_done() instead.
463 * Return false if device should avoid rearming interrupts.
464 */
465 static inline bool napi_complete(struct napi_struct *n)
466 {
467 return napi_complete_done(n, 0);
468 }
469
470 /**
471 * napi_hash_del - remove a NAPI from global table
472 * @napi: NAPI context
473 *
474 * Warning: caller must observe RCU grace period
475 * before freeing memory containing @napi, if
476 * this function returns true.
477 * Note: core networking stack automatically calls it
478 * from netif_napi_del().
479 * Drivers might want to call this helper to combine all
480 * the needed RCU grace periods into a single one.
481 */
482 bool napi_hash_del(struct napi_struct *napi);
483
484 /**
485 * napi_disable - prevent NAPI from scheduling
486 * @n: NAPI context
487 *
488 * Stop NAPI from being scheduled on this context.
489 * Waits till any outstanding processing completes.
490 */
491 void napi_disable(struct napi_struct *n);
492
493 /**
494 * napi_enable - enable NAPI scheduling
495 * @n: NAPI context
496 *
497 * Resume NAPI from being scheduled on this context.
498 * Must be paired with napi_disable.
499 */
500 static inline void napi_enable(struct napi_struct *n)
501 {
502 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
503 smp_mb__before_atomic();
504 clear_bit(NAPI_STATE_SCHED, &n->state);
505 clear_bit(NAPI_STATE_NPSVC, &n->state);
506 }
507
508 /**
509 * napi_synchronize - wait until NAPI is not running
510 * @n: NAPI context
511 *
512 * Wait until NAPI is done being scheduled on this context.
513 * Waits till any outstanding processing completes but
514 * does not disable future activations.
515 */
516 static inline void napi_synchronize(const struct napi_struct *n)
517 {
518 if (IS_ENABLED(CONFIG_SMP))
519 while (test_bit(NAPI_STATE_SCHED, &n->state))
520 msleep(1);
521 else
522 barrier();
523 }
524
525 enum netdev_queue_state_t {
526 __QUEUE_STATE_DRV_XOFF,
527 __QUEUE_STATE_STACK_XOFF,
528 __QUEUE_STATE_FROZEN,
529 };
530
531 #define QUEUE_STATE_DRV_XOFF (1 << __QUEUE_STATE_DRV_XOFF)
532 #define QUEUE_STATE_STACK_XOFF (1 << __QUEUE_STATE_STACK_XOFF)
533 #define QUEUE_STATE_FROZEN (1 << __QUEUE_STATE_FROZEN)
534
535 #define QUEUE_STATE_ANY_XOFF (QUEUE_STATE_DRV_XOFF | QUEUE_STATE_STACK_XOFF)
536 #define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF | \
537 QUEUE_STATE_FROZEN)
538 #define QUEUE_STATE_DRV_XOFF_OR_FROZEN (QUEUE_STATE_DRV_XOFF | \
539 QUEUE_STATE_FROZEN)
540
541 /*
542 * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue. The
543 * netif_tx_* functions below are used to manipulate this flag. The
544 * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
545 * queue independently. The netif_xmit_*stopped functions below are called
546 * to check if the queue has been stopped by the driver or stack (either
547 * of the XOFF bits are set in the state). Drivers should not need to call
548 * netif_xmit*stopped functions, they should only be using netif_tx_*.
549 */
550
551 struct netdev_queue {
552 /*
553 * read-mostly part
554 */
555 struct net_device *dev;
556 struct Qdisc __rcu *qdisc;
557 struct Qdisc *qdisc_sleeping;
558 #ifdef CONFIG_SYSFS
559 struct kobject kobj;
560 #endif
561 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
562 int numa_node;
563 #endif
564 unsigned long tx_maxrate;
565 /*
566 * Number of TX timeouts for this queue
567 * (/sys/class/net/DEV/Q/trans_timeout)
568 */
569 unsigned long trans_timeout;
570 /*
571 * write-mostly part
572 */
573 spinlock_t _xmit_lock ____cacheline_aligned_in_smp;
574 int xmit_lock_owner;
575 /*
576 * Time (in jiffies) of last Tx
577 */
578 unsigned long trans_start;
579
580 unsigned long state;
581
582 #ifdef CONFIG_BQL
583 struct dql dql;
584 #endif
585 } ____cacheline_aligned_in_smp;
586
587 static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
588 {
589 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
590 return q->numa_node;
591 #else
592 return NUMA_NO_NODE;
593 #endif
594 }
595
596 static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
597 {
598 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
599 q->numa_node = node;
600 #endif
601 }
602
603 #ifdef CONFIG_RPS
604 /*
605 * This structure holds an RPS map which can be of variable length. The
606 * map is an array of CPUs.
607 */
608 struct rps_map {
609 unsigned int len;
610 struct rcu_head rcu;
611 u16 cpus[0];
612 };
613 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
614
615 /*
616 * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
617 * tail pointer for that CPU's input queue at the time of last enqueue, and
618 * a hardware filter index.
619 */
620 struct rps_dev_flow {
621 u16 cpu;
622 u16 filter;
623 unsigned int last_qtail;
624 };
625 #define RPS_NO_FILTER 0xffff
626
627 /*
628 * The rps_dev_flow_table structure contains a table of flow mappings.
629 */
630 struct rps_dev_flow_table {
631 unsigned int mask;
632 struct rcu_head rcu;
633 struct rps_dev_flow flows[0];
634 };
635 #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
636 ((_num) * sizeof(struct rps_dev_flow)))
637
638 /*
639 * The rps_sock_flow_table contains mappings of flows to the last CPU
640 * on which they were processed by the application (set in recvmsg).
641 * Each entry is a 32bit value. Upper part is the high-order bits
642 * of flow hash, lower part is CPU number.
643 * rps_cpu_mask is used to partition the space, depending on number of
644 * possible CPUs : rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1
645 * For example, if 64 CPUs are possible, rps_cpu_mask = 0x3f,
646 * meaning we use 32-6=26 bits for the hash.
647 */
648 struct rps_sock_flow_table {
649 u32 mask;
650
651 u32 ents[0] ____cacheline_aligned_in_smp;
652 };
653 #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (offsetof(struct rps_sock_flow_table, ents[_num]))
654
655 #define RPS_NO_CPU 0xffff
656
657 extern u32 rps_cpu_mask;
658 extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
659
660 static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
661 u32 hash)
662 {
663 if (table && hash) {
664 unsigned int index = hash & table->mask;
665 u32 val = hash & ~rps_cpu_mask;
666
667 /* We only give a hint, preemption can change CPU under us */
668 val |= raw_smp_processor_id();
669
670 if (table->ents[index] != val)
671 table->ents[index] = val;
672 }
673 }
674
675 #ifdef CONFIG_RFS_ACCEL
676 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id,
677 u16 filter_id);
678 #endif
679 #endif /* CONFIG_RPS */
680
681 /* This structure contains an instance of an RX queue. */
682 struct netdev_rx_queue {
683 #ifdef CONFIG_RPS
684 struct rps_map __rcu *rps_map;
685 struct rps_dev_flow_table __rcu *rps_flow_table;
686 #endif
687 struct kobject kobj;
688 struct net_device *dev;
689 } ____cacheline_aligned_in_smp;
690
691 /*
692 * RX queue sysfs structures and functions.
693 */
694 struct rx_queue_attribute {
695 struct attribute attr;
696 ssize_t (*show)(struct netdev_rx_queue *queue, char *buf);
697 ssize_t (*store)(struct netdev_rx_queue *queue,
698 const char *buf, size_t len);
699 };
700
701 #ifdef CONFIG_XPS
702 /*
703 * This structure holds an XPS map which can be of variable length. The
704 * map is an array of queues.
705 */
706 struct xps_map {
707 unsigned int len;
708 unsigned int alloc_len;
709 struct rcu_head rcu;
710 u16 queues[0];
711 };
712 #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
713 #define XPS_MIN_MAP_ALLOC ((L1_CACHE_ALIGN(offsetof(struct xps_map, queues[1])) \
714 - sizeof(struct xps_map)) / sizeof(u16))
715
716 /*
717 * This structure holds all XPS maps for device. Maps are indexed by CPU.
718 */
719 struct xps_dev_maps {
720 struct rcu_head rcu;
721 struct xps_map __rcu *cpu_map[0];
722 };
723 #define XPS_DEV_MAPS_SIZE(_tcs) (sizeof(struct xps_dev_maps) + \
724 (nr_cpu_ids * (_tcs) * sizeof(struct xps_map *)))
725 #endif /* CONFIG_XPS */
726
727 #define TC_MAX_QUEUE 16
728 #define TC_BITMASK 15
729 /* HW offloaded queuing disciplines txq count and offset maps */
730 struct netdev_tc_txq {
731 u16 count;
732 u16 offset;
733 };
734
735 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
736 /*
737 * This structure is to hold information about the device
738 * configured to run FCoE protocol stack.
739 */
740 struct netdev_fcoe_hbainfo {
741 char manufacturer[64];
742 char serial_number[64];
743 char hardware_version[64];
744 char driver_version[64];
745 char optionrom_version[64];
746 char firmware_version[64];
747 char model[256];
748 char model_description[256];
749 };
750 #endif
751
752 #define MAX_PHYS_ITEM_ID_LEN 32
753
754 /* This structure holds a unique identifier to identify some
755 * physical item (port for example) used by a netdevice.
756 */
757 struct netdev_phys_item_id {
758 unsigned char id[MAX_PHYS_ITEM_ID_LEN];
759 unsigned char id_len;
760 };
761
762 static inline bool netdev_phys_item_id_same(struct netdev_phys_item_id *a,
763 struct netdev_phys_item_id *b)
764 {
765 return a->id_len == b->id_len &&
766 memcmp(a->id, b->id, a->id_len) == 0;
767 }
768
769 typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
770 struct sk_buff *skb);
771
772 enum tc_setup_type {
773 TC_SETUP_QDISC_MQPRIO,
774 TC_SETUP_CLSU32,
775 TC_SETUP_CLSFLOWER,
776 TC_SETUP_CLSMATCHALL,
777 TC_SETUP_CLSBPF,
778 TC_SETUP_BLOCK,
779 TC_SETUP_QDISC_CBS,
780 TC_SETUP_QDISC_RED,
781 };
782
783 /* These structures hold the attributes of bpf state that are being passed
784 * to the netdevice through the bpf op.
785 */
786 enum bpf_netdev_command {
787 /* Set or clear a bpf program used in the earliest stages of packet
788 * rx. The prog will have been loaded as BPF_PROG_TYPE_XDP. The callee
789 * is responsible for calling bpf_prog_put on any old progs that are
790 * stored. In case of error, the callee need not release the new prog
791 * reference, but on success it takes ownership and must bpf_prog_put
792 * when it is no longer used.
793 */
794 XDP_SETUP_PROG,
795 XDP_SETUP_PROG_HW,
796 /* Check if a bpf program is set on the device. The callee should
797 * set @prog_attached to one of XDP_ATTACHED_* values, note that "true"
798 * is equivalent to XDP_ATTACHED_DRV.
799 */
800 XDP_QUERY_PROG,
801 /* BPF program for offload callbacks, invoked at program load time. */
802 BPF_OFFLOAD_VERIFIER_PREP,
803 BPF_OFFLOAD_TRANSLATE,
804 BPF_OFFLOAD_DESTROY,
805 };
806
807 struct bpf_ext_analyzer_ops;
808 struct netlink_ext_ack;
809
810 struct netdev_bpf {
811 enum bpf_netdev_command command;
812 union {
813 /* XDP_SETUP_PROG */
814 struct {
815 u32 flags;
816 struct bpf_prog *prog;
817 struct netlink_ext_ack *extack;
818 };
819 /* XDP_QUERY_PROG */
820 struct {
821 u8 prog_attached;
822 u32 prog_id;
823 };
824 /* BPF_OFFLOAD_VERIFIER_PREP */
825 struct {
826 struct bpf_prog *prog;
827 const struct bpf_ext_analyzer_ops *ops; /* callee set */
828 } verifier;
829 /* BPF_OFFLOAD_TRANSLATE, BPF_OFFLOAD_DESTROY */
830 struct {
831 struct bpf_prog *prog;
832 } offload;
833 };
834 };
835
836 #ifdef CONFIG_XFRM_OFFLOAD
837 struct xfrmdev_ops {
838 int (*xdo_dev_state_add) (struct xfrm_state *x);
839 void (*xdo_dev_state_delete) (struct xfrm_state *x);
840 void (*xdo_dev_state_free) (struct xfrm_state *x);
841 bool (*xdo_dev_offload_ok) (struct sk_buff *skb,
842 struct xfrm_state *x);
843 };
844 #endif
845
846 struct dev_ifalias {
847 struct rcu_head rcuhead;
848 char ifalias[];
849 };
850
851 /*
852 * This structure defines the management hooks for network devices.
853 * The following hooks can be defined; unless noted otherwise, they are
854 * optional and can be filled with a null pointer.
855 *
856 * int (*ndo_init)(struct net_device *dev);
857 * This function is called once when a network device is registered.
858 * The network device can use this for any late stage initialization
859 * or semantic validation. It can fail with an error code which will
860 * be propagated back to register_netdev.
861 *
862 * void (*ndo_uninit)(struct net_device *dev);
863 * This function is called when device is unregistered or when registration
864 * fails. It is not called if init fails.
865 *
866 * int (*ndo_open)(struct net_device *dev);
867 * This function is called when a network device transitions to the up
868 * state.
869 *
870 * int (*ndo_stop)(struct net_device *dev);
871 * This function is called when a network device transitions to the down
872 * state.
873 *
874 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
875 * struct net_device *dev);
876 * Called when a packet needs to be transmitted.
877 * Returns NETDEV_TX_OK. Can return NETDEV_TX_BUSY, but you should stop
878 * the queue before that can happen; it's for obsolete devices and weird
879 * corner cases, but the stack really does a non-trivial amount
880 * of useless work if you return NETDEV_TX_BUSY.
881 * Required; cannot be NULL.
882 *
883 * netdev_features_t (*ndo_features_check)(struct sk_buff *skb,
884 * struct net_device *dev
885 * netdev_features_t features);
886 * Called by core transmit path to determine if device is capable of
887 * performing offload operations on a given packet. This is to give
888 * the device an opportunity to implement any restrictions that cannot
889 * be otherwise expressed by feature flags. The check is called with
890 * the set of features that the stack has calculated and it returns
891 * those the driver believes to be appropriate.
892 *
893 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb,
894 * void *accel_priv, select_queue_fallback_t fallback);
895 * Called to decide which queue to use when device supports multiple
896 * transmit queues.
897 *
898 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
899 * This function is called to allow device receiver to make
900 * changes to configuration when multicast or promiscuous is enabled.
901 *
902 * void (*ndo_set_rx_mode)(struct net_device *dev);
903 * This function is called device changes address list filtering.
904 * If driver handles unicast address filtering, it should set
905 * IFF_UNICAST_FLT in its priv_flags.
906 *
907 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
908 * This function is called when the Media Access Control address
909 * needs to be changed. If this interface is not defined, the
910 * MAC address can not be changed.
911 *
912 * int (*ndo_validate_addr)(struct net_device *dev);
913 * Test if Media Access Control address is valid for the device.
914 *
915 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
916 * Called when a user requests an ioctl which can't be handled by
917 * the generic interface code. If not defined ioctls return
918 * not supported error code.
919 *
920 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
921 * Used to set network devices bus interface parameters. This interface
922 * is retained for legacy reasons; new devices should use the bus
923 * interface (PCI) for low level management.
924 *
925 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
926 * Called when a user wants to change the Maximum Transfer Unit
927 * of a device.
928 *
929 * void (*ndo_tx_timeout)(struct net_device *dev);
930 * Callback used when the transmitter has not made any progress
931 * for dev->watchdog ticks.
932 *
933 * void (*ndo_get_stats64)(struct net_device *dev,
934 * struct rtnl_link_stats64 *storage);
935 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
936 * Called when a user wants to get the network device usage
937 * statistics. Drivers must do one of the following:
938 * 1. Define @ndo_get_stats64 to fill in a zero-initialised
939 * rtnl_link_stats64 structure passed by the caller.
940 * 2. Define @ndo_get_stats to update a net_device_stats structure
941 * (which should normally be dev->stats) and return a pointer to
942 * it. The structure may be changed asynchronously only if each
943 * field is written atomically.
944 * 3. Update dev->stats asynchronously and atomically, and define
945 * neither operation.
946 *
947 * bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id)
948 * Return true if this device supports offload stats of this attr_id.
949 *
950 * int (*ndo_get_offload_stats)(int attr_id, const struct net_device *dev,
951 * void *attr_data)
952 * Get statistics for offload operations by attr_id. Write it into the
953 * attr_data pointer.
954 *
955 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16 vid);
956 * If device supports VLAN filtering this function is called when a
957 * VLAN id is registered.
958 *
959 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, __be16 proto, u16 vid);
960 * If device supports VLAN filtering this function is called when a
961 * VLAN id is unregistered.
962 *
963 * void (*ndo_poll_controller)(struct net_device *dev);
964 *
965 * SR-IOV management functions.
966 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
967 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan,
968 * u8 qos, __be16 proto);
969 * int (*ndo_set_vf_rate)(struct net_device *dev, int vf, int min_tx_rate,
970 * int max_tx_rate);
971 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
972 * int (*ndo_set_vf_trust)(struct net_device *dev, int vf, bool setting);
973 * int (*ndo_get_vf_config)(struct net_device *dev,
974 * int vf, struct ifla_vf_info *ivf);
975 * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state);
976 * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
977 * struct nlattr *port[]);
978 *
979 * Enable or disable the VF ability to query its RSS Redirection Table and
980 * Hash Key. This is needed since on some devices VF share this information
981 * with PF and querying it may introduce a theoretical security risk.
982 * int (*ndo_set_vf_rss_query_en)(struct net_device *dev, int vf, bool setting);
983 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
984 * int (*ndo_setup_tc)(struct net_device *dev, enum tc_setup_type type,
985 * void *type_data);
986 * Called to setup any 'tc' scheduler, classifier or action on @dev.
987 * This is always called from the stack with the rtnl lock held and netif
988 * tx queues stopped. This allows the netdevice to perform queue
989 * management safely.
990 *
991 * Fiber Channel over Ethernet (FCoE) offload functions.
992 * int (*ndo_fcoe_enable)(struct net_device *dev);
993 * Called when the FCoE protocol stack wants to start using LLD for FCoE
994 * so the underlying device can perform whatever needed configuration or
995 * initialization to support acceleration of FCoE traffic.
996 *
997 * int (*ndo_fcoe_disable)(struct net_device *dev);
998 * Called when the FCoE protocol stack wants to stop using LLD for FCoE
999 * so the underlying device can perform whatever needed clean-ups to
1000 * stop supporting acceleration of FCoE traffic.
1001 *
1002 * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid,
1003 * struct scatterlist *sgl, unsigned int sgc);
1004 * Called when the FCoE Initiator wants to initialize an I/O that
1005 * is a possible candidate for Direct Data Placement (DDP). The LLD can
1006 * perform necessary setup and returns 1 to indicate the device is set up
1007 * successfully to perform DDP on this I/O, otherwise this returns 0.
1008 *
1009 * int (*ndo_fcoe_ddp_done)(struct net_device *dev, u16 xid);
1010 * Called when the FCoE Initiator/Target is done with the DDPed I/O as
1011 * indicated by the FC exchange id 'xid', so the underlying device can
1012 * clean up and reuse resources for later DDP requests.
1013 *
1014 * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid,
1015 * struct scatterlist *sgl, unsigned int sgc);
1016 * Called when the FCoE Target wants to initialize an I/O that
1017 * is a possible candidate for Direct Data Placement (DDP). The LLD can
1018 * perform necessary setup and returns 1 to indicate the device is set up
1019 * successfully to perform DDP on this I/O, otherwise this returns 0.
1020 *
1021 * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
1022 * struct netdev_fcoe_hbainfo *hbainfo);
1023 * Called when the FCoE Protocol stack wants information on the underlying
1024 * device. This information is utilized by the FCoE protocol stack to
1025 * register attributes with Fiber Channel management service as per the
1026 * FC-GS Fabric Device Management Information(FDMI) specification.
1027 *
1028 * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type);
1029 * Called when the underlying device wants to override default World Wide
1030 * Name (WWN) generation mechanism in FCoE protocol stack to pass its own
1031 * World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE
1032 * protocol stack to use.
1033 *
1034 * RFS acceleration.
1035 * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb,
1036 * u16 rxq_index, u32 flow_id);
1037 * Set hardware filter for RFS. rxq_index is the target queue index;
1038 * flow_id is a flow ID to be passed to rps_may_expire_flow() later.
1039 * Return the filter ID on success, or a negative error code.
1040 *
1041 * Slave management functions (for bridge, bonding, etc).
1042 * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
1043 * Called to make another netdev an underling.
1044 *
1045 * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
1046 * Called to release previously enslaved netdev.
1047 *
1048 * Feature/offload setting functions.
1049 * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
1050 * netdev_features_t features);
1051 * Adjusts the requested feature flags according to device-specific
1052 * constraints, and returns the resulting flags. Must not modify
1053 * the device state.
1054 *
1055 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
1056 * Called to update device configuration to new features. Passed
1057 * feature set might be less than what was returned by ndo_fix_features()).
1058 * Must return >0 or -errno if it changed dev->features itself.
1059 *
1060 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
1061 * struct net_device *dev,
1062 * const unsigned char *addr, u16 vid, u16 flags)
1063 * Adds an FDB entry to dev for addr.
1064 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[],
1065 * struct net_device *dev,
1066 * const unsigned char *addr, u16 vid)
1067 * Deletes the FDB entry from dev coresponding to addr.
1068 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
1069 * struct net_device *dev, struct net_device *filter_dev,
1070 * int *idx)
1071 * Used to add FDB entries to dump requests. Implementers should add
1072 * entries to skb and update idx with the number of entries.
1073 *
1074 * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh,
1075 * u16 flags)
1076 * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq,
1077 * struct net_device *dev, u32 filter_mask,
1078 * int nlflags)
1079 * int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh,
1080 * u16 flags);
1081 *
1082 * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier);
1083 * Called to change device carrier. Soft-devices (like dummy, team, etc)
1084 * which do not represent real hardware may define this to allow their
1085 * userspace components to manage their virtual carrier state. Devices
1086 * that determine carrier state from physical hardware properties (eg
1087 * network cables) or protocol-dependent mechanisms (eg
1088 * USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function.
1089 *
1090 * int (*ndo_get_phys_port_id)(struct net_device *dev,
1091 * struct netdev_phys_item_id *ppid);
1092 * Called to get ID of physical port of this device. If driver does
1093 * not implement this, it is assumed that the hw is not able to have
1094 * multiple net devices on single physical port.
1095 *
1096 * void (*ndo_udp_tunnel_add)(struct net_device *dev,
1097 * struct udp_tunnel_info *ti);
1098 * Called by UDP tunnel to notify a driver about the UDP port and socket
1099 * address family that a UDP tunnel is listnening to. It is called only
1100 * when a new port starts listening. The operation is protected by the
1101 * RTNL.
1102 *
1103 * void (*ndo_udp_tunnel_del)(struct net_device *dev,
1104 * struct udp_tunnel_info *ti);
1105 * Called by UDP tunnel to notify the driver about a UDP port and socket
1106 * address family that the UDP tunnel is not listening to anymore. The
1107 * operation is protected by the RTNL.
1108 *
1109 * void* (*ndo_dfwd_add_station)(struct net_device *pdev,
1110 * struct net_device *dev)
1111 * Called by upper layer devices to accelerate switching or other
1112 * station functionality into hardware. 'pdev is the lowerdev
1113 * to use for the offload and 'dev' is the net device that will
1114 * back the offload. Returns a pointer to the private structure
1115 * the upper layer will maintain.
1116 * void (*ndo_dfwd_del_station)(struct net_device *pdev, void *priv)
1117 * Called by upper layer device to delete the station created
1118 * by 'ndo_dfwd_add_station'. 'pdev' is the net device backing
1119 * the station and priv is the structure returned by the add
1120 * operation.
1121 * int (*ndo_set_tx_maxrate)(struct net_device *dev,
1122 * int queue_index, u32 maxrate);
1123 * Called when a user wants to set a max-rate limitation of specific
1124 * TX queue.
1125 * int (*ndo_get_iflink)(const struct net_device *dev);
1126 * Called to get the iflink value of this device.
1127 * void (*ndo_change_proto_down)(struct net_device *dev,
1128 * bool proto_down);
1129 * This function is used to pass protocol port error state information
1130 * to the switch driver. The switch driver can react to the proto_down
1131 * by doing a phys down on the associated switch port.
1132 * int (*ndo_fill_metadata_dst)(struct net_device *dev, struct sk_buff *skb);
1133 * This function is used to get egress tunnel information for given skb.
1134 * This is useful for retrieving outer tunnel header parameters while
1135 * sampling packet.
1136 * void (*ndo_set_rx_headroom)(struct net_device *dev, int needed_headroom);
1137 * This function is used to specify the headroom that the skb must
1138 * consider when allocation skb during packet reception. Setting
1139 * appropriate rx headroom value allows avoiding skb head copy on
1140 * forward. Setting a negative value resets the rx headroom to the
1141 * default value.
1142 * int (*ndo_bpf)(struct net_device *dev, struct netdev_bpf *bpf);
1143 * This function is used to set or query state related to XDP on the
1144 * netdevice and manage BPF offload. See definition of
1145 * enum bpf_netdev_command for details.
1146 * int (*ndo_xdp_xmit)(struct net_device *dev, struct xdp_buff *xdp);
1147 * This function is used to submit a XDP packet for transmit on a
1148 * netdevice.
1149 * void (*ndo_xdp_flush)(struct net_device *dev);
1150 * This function is used to inform the driver to flush a particular
1151 * xdp tx queue. Must be called on same CPU as xdp_xmit.
1152 */
1153 struct net_device_ops {
1154 int (*ndo_init)(struct net_device *dev);
1155 void (*ndo_uninit)(struct net_device *dev);
1156 int (*ndo_open)(struct net_device *dev);
1157 int (*ndo_stop)(struct net_device *dev);
1158 netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
1159 struct net_device *dev);
1160 netdev_features_t (*ndo_features_check)(struct sk_buff *skb,
1161 struct net_device *dev,
1162 netdev_features_t features);
1163 u16 (*ndo_select_queue)(struct net_device *dev,
1164 struct sk_buff *skb,
1165 void *accel_priv,
1166 select_queue_fallback_t fallback);
1167 void (*ndo_change_rx_flags)(struct net_device *dev,
1168 int flags);
1169 void (*ndo_set_rx_mode)(struct net_device *dev);
1170 int (*ndo_set_mac_address)(struct net_device *dev,
1171 void *addr);
1172 int (*ndo_validate_addr)(struct net_device *dev);
1173 int (*ndo_do_ioctl)(struct net_device *dev,
1174 struct ifreq *ifr, int cmd);
1175 int (*ndo_set_config)(struct net_device *dev,
1176 struct ifmap *map);
1177 int (*ndo_change_mtu)(struct net_device *dev,
1178 int new_mtu);
1179 int (*ndo_neigh_setup)(struct net_device *dev,
1180 struct neigh_parms *);
1181 void (*ndo_tx_timeout) (struct net_device *dev);
1182
1183 void (*ndo_get_stats64)(struct net_device *dev,
1184 struct rtnl_link_stats64 *storage);
1185 bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id);
1186 int (*ndo_get_offload_stats)(int attr_id,
1187 const struct net_device *dev,
1188 void *attr_data);
1189 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
1190
1191 int (*ndo_vlan_rx_add_vid)(struct net_device *dev,
1192 __be16 proto, u16 vid);
1193 int (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
1194 __be16 proto, u16 vid);
1195 #ifdef CONFIG_NET_POLL_CONTROLLER
1196 void (*ndo_poll_controller)(struct net_device *dev);
1197 int (*ndo_netpoll_setup)(struct net_device *dev,
1198 struct netpoll_info *info);
1199 void (*ndo_netpoll_cleanup)(struct net_device *dev);
1200 #endif
1201 int (*ndo_set_vf_mac)(struct net_device *dev,
1202 int queue, u8 *mac);
1203 int (*ndo_set_vf_vlan)(struct net_device *dev,
1204 int queue, u16 vlan,
1205 u8 qos, __be16 proto);
1206 int (*ndo_set_vf_rate)(struct net_device *dev,
1207 int vf, int min_tx_rate,
1208 int max_tx_rate);
1209 int (*ndo_set_vf_spoofchk)(struct net_device *dev,
1210 int vf, bool setting);
1211 int (*ndo_set_vf_trust)(struct net_device *dev,
1212 int vf, bool setting);
1213 int (*ndo_get_vf_config)(struct net_device *dev,
1214 int vf,
1215 struct ifla_vf_info *ivf);
1216 int (*ndo_set_vf_link_state)(struct net_device *dev,
1217 int vf, int link_state);
1218 int (*ndo_get_vf_stats)(struct net_device *dev,
1219 int vf,
1220 struct ifla_vf_stats
1221 *vf_stats);
1222 int (*ndo_set_vf_port)(struct net_device *dev,
1223 int vf,
1224 struct nlattr *port[]);
1225 int (*ndo_get_vf_port)(struct net_device *dev,
1226 int vf, struct sk_buff *skb);
1227 int (*ndo_set_vf_guid)(struct net_device *dev,
1228 int vf, u64 guid,
1229 int guid_type);
1230 int (*ndo_set_vf_rss_query_en)(
1231 struct net_device *dev,
1232 int vf, bool setting);
1233 int (*ndo_setup_tc)(struct net_device *dev,
1234 enum tc_setup_type type,
1235 void *type_data);
1236 #if IS_ENABLED(CONFIG_FCOE)
1237 int (*ndo_fcoe_enable)(struct net_device *dev);
1238 int (*ndo_fcoe_disable)(struct net_device *dev);
1239 int (*ndo_fcoe_ddp_setup)(struct net_device *dev,
1240 u16 xid,
1241 struct scatterlist *sgl,
1242 unsigned int sgc);
1243 int (*ndo_fcoe_ddp_done)(struct net_device *dev,
1244 u16 xid);
1245 int (*ndo_fcoe_ddp_target)(struct net_device *dev,
1246 u16 xid,
1247 struct scatterlist *sgl,
1248 unsigned int sgc);
1249 int (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
1250 struct netdev_fcoe_hbainfo *hbainfo);
1251 #endif
1252
1253 #if IS_ENABLED(CONFIG_LIBFCOE)
1254 #define NETDEV_FCOE_WWNN 0
1255 #define NETDEV_FCOE_WWPN 1
1256 int (*ndo_fcoe_get_wwn)(struct net_device *dev,
1257 u64 *wwn, int type);
1258 #endif
1259
1260 #ifdef CONFIG_RFS_ACCEL
1261 int (*ndo_rx_flow_steer)(struct net_device *dev,
1262 const struct sk_buff *skb,
1263 u16 rxq_index,
1264 u32 flow_id);
1265 #endif
1266 int (*ndo_add_slave)(struct net_device *dev,
1267 struct net_device *slave_dev,
1268 struct netlink_ext_ack *extack);
1269 int (*ndo_del_slave)(struct net_device *dev,
1270 struct net_device *slave_dev);
1271 netdev_features_t (*ndo_fix_features)(struct net_device *dev,
1272 netdev_features_t features);
1273 int (*ndo_set_features)(struct net_device *dev,
1274 netdev_features_t features);
1275 int (*ndo_neigh_construct)(struct net_device *dev,
1276 struct neighbour *n);
1277 void (*ndo_neigh_destroy)(struct net_device *dev,
1278 struct neighbour *n);
1279
1280 int (*ndo_fdb_add)(struct ndmsg *ndm,
1281 struct nlattr *tb[],
1282 struct net_device *dev,
1283 const unsigned char *addr,
1284 u16 vid,
1285 u16 flags);
1286 int (*ndo_fdb_del)(struct ndmsg *ndm,
1287 struct nlattr *tb[],
1288 struct net_device *dev,
1289 const unsigned char *addr,
1290 u16 vid);
1291 int (*ndo_fdb_dump)(struct sk_buff *skb,
1292 struct netlink_callback *cb,
1293 struct net_device *dev,
1294 struct net_device *filter_dev,
1295 int *idx);
1296
1297 int (*ndo_bridge_setlink)(struct net_device *dev,
1298 struct nlmsghdr *nlh,
1299 u16 flags);
1300 int (*ndo_bridge_getlink)(struct sk_buff *skb,
1301 u32 pid, u32 seq,
1302 struct net_device *dev,
1303 u32 filter_mask,
1304 int nlflags);
1305 int (*ndo_bridge_dellink)(struct net_device *dev,
1306 struct nlmsghdr *nlh,
1307 u16 flags);
1308 int (*ndo_change_carrier)(struct net_device *dev,
1309 bool new_carrier);
1310 int (*ndo_get_phys_port_id)(struct net_device *dev,
1311 struct netdev_phys_item_id *ppid);
1312 int (*ndo_get_phys_port_name)(struct net_device *dev,
1313 char *name, size_t len);
1314 void (*ndo_udp_tunnel_add)(struct net_device *dev,
1315 struct udp_tunnel_info *ti);
1316 void (*ndo_udp_tunnel_del)(struct net_device *dev,
1317 struct udp_tunnel_info *ti);
1318 void* (*ndo_dfwd_add_station)(struct net_device *pdev,
1319 struct net_device *dev);
1320 void (*ndo_dfwd_del_station)(struct net_device *pdev,
1321 void *priv);
1322
1323 int (*ndo_get_lock_subclass)(struct net_device *dev);
1324 int (*ndo_set_tx_maxrate)(struct net_device *dev,
1325 int queue_index,
1326 u32 maxrate);
1327 int (*ndo_get_iflink)(const struct net_device *dev);
1328 int (*ndo_change_proto_down)(struct net_device *dev,
1329 bool proto_down);
1330 int (*ndo_fill_metadata_dst)(struct net_device *dev,
1331 struct sk_buff *skb);
1332 void (*ndo_set_rx_headroom)(struct net_device *dev,
1333 int needed_headroom);
1334 int (*ndo_bpf)(struct net_device *dev,
1335 struct netdev_bpf *bpf);
1336 int (*ndo_xdp_xmit)(struct net_device *dev,
1337 struct xdp_buff *xdp);
1338 void (*ndo_xdp_flush)(struct net_device *dev);
1339 };
1340
1341 /**
1342 * enum net_device_priv_flags - &struct net_device priv_flags
1343 *
1344 * These are the &struct net_device, they are only set internally
1345 * by drivers and used in the kernel. These flags are invisible to
1346 * userspace; this means that the order of these flags can change
1347 * during any kernel release.
1348 *
1349 * You should have a pretty good reason to be extending these flags.
1350 *
1351 * @IFF_802_1Q_VLAN: 802.1Q VLAN device
1352 * @IFF_EBRIDGE: Ethernet bridging device
1353 * @IFF_BONDING: bonding master or slave
1354 * @IFF_ISATAP: ISATAP interface (RFC4214)
1355 * @IFF_WAN_HDLC: WAN HDLC device
1356 * @IFF_XMIT_DST_RELEASE: dev_hard_start_xmit() is allowed to
1357 * release skb->dst
1358 * @IFF_DONT_BRIDGE: disallow bridging this ether dev
1359 * @IFF_DISABLE_NETPOLL: disable netpoll at run-time
1360 * @IFF_MACVLAN_PORT: device used as macvlan port
1361 * @IFF_BRIDGE_PORT: device used as bridge port
1362 * @IFF_OVS_DATAPATH: device used as Open vSwitch datapath port
1363 * @IFF_TX_SKB_SHARING: The interface supports sharing skbs on transmit
1364 * @IFF_UNICAST_FLT: Supports unicast filtering
1365 * @IFF_TEAM_PORT: device used as team port
1366 * @IFF_SUPP_NOFCS: device supports sending custom FCS
1367 * @IFF_LIVE_ADDR_CHANGE: device supports hardware address
1368 * change when it's running
1369 * @IFF_MACVLAN: Macvlan device
1370 * @IFF_XMIT_DST_RELEASE_PERM: IFF_XMIT_DST_RELEASE not taking into account
1371 * underlying stacked devices
1372 * @IFF_IPVLAN_MASTER: IPvlan master device
1373 * @IFF_IPVLAN_SLAVE: IPvlan slave device
1374 * @IFF_L3MDEV_MASTER: device is an L3 master device
1375 * @IFF_NO_QUEUE: device can run without qdisc attached
1376 * @IFF_OPENVSWITCH: device is a Open vSwitch master
1377 * @IFF_L3MDEV_SLAVE: device is enslaved to an L3 master device
1378 * @IFF_TEAM: device is a team device
1379 * @IFF_RXFH_CONFIGURED: device has had Rx Flow indirection table configured
1380 * @IFF_PHONY_HEADROOM: the headroom value is controlled by an external
1381 * entity (i.e. the master device for bridged veth)
1382 * @IFF_MACSEC: device is a MACsec device
1383 * @IFF_L3MDEV_RX_HANDLER: only invoke the rx handler of L3 master device
1384 */
1385 enum netdev_priv_flags {
1386 IFF_802_1Q_VLAN = 1<<0,
1387 IFF_EBRIDGE = 1<<1,
1388 IFF_BONDING = 1<<2,
1389 IFF_ISATAP = 1<<3,
1390 IFF_WAN_HDLC = 1<<4,
1391 IFF_XMIT_DST_RELEASE = 1<<5,
1392 IFF_DONT_BRIDGE = 1<<6,
1393 IFF_DISABLE_NETPOLL = 1<<7,
1394 IFF_MACVLAN_PORT = 1<<8,
1395 IFF_BRIDGE_PORT = 1<<9,
1396 IFF_OVS_DATAPATH = 1<<10,
1397 IFF_TX_SKB_SHARING = 1<<11,
1398 IFF_UNICAST_FLT = 1<<12,
1399 IFF_TEAM_PORT = 1<<13,
1400 IFF_SUPP_NOFCS = 1<<14,
1401 IFF_LIVE_ADDR_CHANGE = 1<<15,
1402 IFF_MACVLAN = 1<<16,
1403 IFF_XMIT_DST_RELEASE_PERM = 1<<17,
1404 IFF_IPVLAN_MASTER = 1<<18,
1405 IFF_IPVLAN_SLAVE = 1<<19,
1406 IFF_L3MDEV_MASTER = 1<<20,
1407 IFF_NO_QUEUE = 1<<21,
1408 IFF_OPENVSWITCH = 1<<22,
1409 IFF_L3MDEV_SLAVE = 1<<23,
1410 IFF_TEAM = 1<<24,
1411 IFF_RXFH_CONFIGURED = 1<<25,
1412 IFF_PHONY_HEADROOM = 1<<26,
1413 IFF_MACSEC = 1<<27,
1414 IFF_L3MDEV_RX_HANDLER = 1<<28,
1415 };
1416
1417 #define IFF_802_1Q_VLAN IFF_802_1Q_VLAN
1418 #define IFF_EBRIDGE IFF_EBRIDGE
1419 #define IFF_BONDING IFF_BONDING
1420 #define IFF_ISATAP IFF_ISATAP
1421 #define IFF_WAN_HDLC IFF_WAN_HDLC
1422 #define IFF_XMIT_DST_RELEASE IFF_XMIT_DST_RELEASE
1423 #define IFF_DONT_BRIDGE IFF_DONT_BRIDGE
1424 #define IFF_DISABLE_NETPOLL IFF_DISABLE_NETPOLL
1425 #define IFF_MACVLAN_PORT IFF_MACVLAN_PORT
1426 #define IFF_BRIDGE_PORT IFF_BRIDGE_PORT
1427 #define IFF_OVS_DATAPATH IFF_OVS_DATAPATH
1428 #define IFF_TX_SKB_SHARING IFF_TX_SKB_SHARING
1429 #define IFF_UNICAST_FLT IFF_UNICAST_FLT
1430 #define IFF_TEAM_PORT IFF_TEAM_PORT
1431 #define IFF_SUPP_NOFCS IFF_SUPP_NOFCS
1432 #define IFF_LIVE_ADDR_CHANGE IFF_LIVE_ADDR_CHANGE
1433 #define IFF_MACVLAN IFF_MACVLAN
1434 #define IFF_XMIT_DST_RELEASE_PERM IFF_XMIT_DST_RELEASE_PERM
1435 #define IFF_IPVLAN_MASTER IFF_IPVLAN_MASTER
1436 #define IFF_IPVLAN_SLAVE IFF_IPVLAN_SLAVE
1437 #define IFF_L3MDEV_MASTER IFF_L3MDEV_MASTER
1438 #define IFF_NO_QUEUE IFF_NO_QUEUE
1439 #define IFF_OPENVSWITCH IFF_OPENVSWITCH
1440 #define IFF_L3MDEV_SLAVE IFF_L3MDEV_SLAVE
1441 #define IFF_TEAM IFF_TEAM
1442 #define IFF_RXFH_CONFIGURED IFF_RXFH_CONFIGURED
1443 #define IFF_MACSEC IFF_MACSEC
1444 #define IFF_L3MDEV_RX_HANDLER IFF_L3MDEV_RX_HANDLER
1445
1446 /**
1447 * struct net_device - The DEVICE structure.
1448 *
1449 * Actually, this whole structure is a big mistake. It mixes I/O
1450 * data with strictly "high-level" data, and it has to know about
1451 * almost every data structure used in the INET module.
1452 *
1453 * @name: This is the first field of the "visible" part of this structure
1454 * (i.e. as seen by users in the "Space.c" file). It is the name
1455 * of the interface.
1456 *
1457 * @name_hlist: Device name hash chain, please keep it close to name[]
1458 * @ifalias: SNMP alias
1459 * @mem_end: Shared memory end
1460 * @mem_start: Shared memory start
1461 * @base_addr: Device I/O address
1462 * @irq: Device IRQ number
1463 *
1464 * @carrier_changes: Stats to monitor carrier on<->off transitions
1465 *
1466 * @state: Generic network queuing layer state, see netdev_state_t
1467 * @dev_list: The global list of network devices
1468 * @napi_list: List entry used for polling NAPI devices
1469 * @unreg_list: List entry when we are unregistering the
1470 * device; see the function unregister_netdev
1471 * @close_list: List entry used when we are closing the device
1472 * @ptype_all: Device-specific packet handlers for all protocols
1473 * @ptype_specific: Device-specific, protocol-specific packet handlers
1474 *
1475 * @adj_list: Directly linked devices, like slaves for bonding
1476 * @features: Currently active device features
1477 * @hw_features: User-changeable features
1478 *
1479 * @wanted_features: User-requested features
1480 * @vlan_features: Mask of features inheritable by VLAN devices
1481 *
1482 * @hw_enc_features: Mask of features inherited by encapsulating devices
1483 * This field indicates what encapsulation
1484 * offloads the hardware is capable of doing,
1485 * and drivers will need to set them appropriately.
1486 *
1487 * @mpls_features: Mask of features inheritable by MPLS
1488 *
1489 * @ifindex: interface index
1490 * @group: The group the device belongs to
1491 *
1492 * @stats: Statistics struct, which was left as a legacy, use
1493 * rtnl_link_stats64 instead
1494 *
1495 * @rx_dropped: Dropped packets by core network,
1496 * do not use this in drivers
1497 * @tx_dropped: Dropped packets by core network,
1498 * do not use this in drivers
1499 * @rx_nohandler: nohandler dropped packets by core network on
1500 * inactive devices, do not use this in drivers
1501 *
1502 * @wireless_handlers: List of functions to handle Wireless Extensions,
1503 * instead of ioctl,
1504 * see <net/iw_handler.h> for details.
1505 * @wireless_data: Instance data managed by the core of wireless extensions
1506 *
1507 * @netdev_ops: Includes several pointers to callbacks,
1508 * if one wants to override the ndo_*() functions
1509 * @ethtool_ops: Management operations
1510 * @ndisc_ops: Includes callbacks for different IPv6 neighbour
1511 * discovery handling. Necessary for e.g. 6LoWPAN.
1512 * @header_ops: Includes callbacks for creating,parsing,caching,etc
1513 * of Layer 2 headers.
1514 *
1515 * @flags: Interface flags (a la BSD)
1516 * @priv_flags: Like 'flags' but invisible to userspace,
1517 * see if.h for the definitions
1518 * @gflags: Global flags ( kept as legacy )
1519 * @padded: How much padding added by alloc_netdev()
1520 * @operstate: RFC2863 operstate
1521 * @link_mode: Mapping policy to operstate
1522 * @if_port: Selectable AUI, TP, ...
1523 * @dma: DMA channel
1524 * @mtu: Interface MTU value
1525 * @min_mtu: Interface Minimum MTU value
1526 * @max_mtu: Interface Maximum MTU value
1527 * @type: Interface hardware type
1528 * @hard_header_len: Maximum hardware header length.
1529 * @min_header_len: Minimum hardware header length
1530 *
1531 * @needed_headroom: Extra headroom the hardware may need, but not in all
1532 * cases can this be guaranteed
1533 * @needed_tailroom: Extra tailroom the hardware may need, but not in all
1534 * cases can this be guaranteed. Some cases also use
1535 * LL_MAX_HEADER instead to allocate the skb
1536 *
1537 * interface address info:
1538 *
1539 * @perm_addr: Permanent hw address
1540 * @addr_assign_type: Hw address assignment type
1541 * @addr_len: Hardware address length
1542 * @neigh_priv_len: Used in neigh_alloc()
1543 * @dev_id: Used to differentiate devices that share
1544 * the same link layer address
1545 * @dev_port: Used to differentiate devices that share
1546 * the same function
1547 * @addr_list_lock: XXX: need comments on this one
1548 * @uc_promisc: Counter that indicates promiscuous mode
1549 * has been enabled due to the need to listen to
1550 * additional unicast addresses in a device that
1551 * does not implement ndo_set_rx_mode()
1552 * @uc: unicast mac addresses
1553 * @mc: multicast mac addresses
1554 * @dev_addrs: list of device hw addresses
1555 * @queues_kset: Group of all Kobjects in the Tx and RX queues
1556 * @promiscuity: Number of times the NIC is told to work in
1557 * promiscuous mode; if it becomes 0 the NIC will
1558 * exit promiscuous mode
1559 * @allmulti: Counter, enables or disables allmulticast mode
1560 *
1561 * @vlan_info: VLAN info
1562 * @dsa_ptr: dsa specific data
1563 * @tipc_ptr: TIPC specific data
1564 * @atalk_ptr: AppleTalk link
1565 * @ip_ptr: IPv4 specific data
1566 * @dn_ptr: DECnet specific data
1567 * @ip6_ptr: IPv6 specific data
1568 * @ax25_ptr: AX.25 specific data
1569 * @ieee80211_ptr: IEEE 802.11 specific data, assign before registering
1570 *
1571 * @dev_addr: Hw address (before bcast,
1572 * because most packets are unicast)
1573 *
1574 * @_rx: Array of RX queues
1575 * @num_rx_queues: Number of RX queues
1576 * allocated at register_netdev() time
1577 * @real_num_rx_queues: Number of RX queues currently active in device
1578 *
1579 * @rx_handler: handler for received packets
1580 * @rx_handler_data: XXX: need comments on this one
1581 * @miniq_ingress: ingress/clsact qdisc specific data for
1582 * ingress processing
1583 * @ingress_queue: XXX: need comments on this one
1584 * @broadcast: hw bcast address
1585 *
1586 * @rx_cpu_rmap: CPU reverse-mapping for RX completion interrupts,
1587 * indexed by RX queue number. Assigned by driver.
1588 * This must only be set if the ndo_rx_flow_steer
1589 * operation is defined
1590 * @index_hlist: Device index hash chain
1591 *
1592 * @_tx: Array of TX queues
1593 * @num_tx_queues: Number of TX queues allocated at alloc_netdev_mq() time
1594 * @real_num_tx_queues: Number of TX queues currently active in device
1595 * @qdisc: Root qdisc from userspace point of view
1596 * @tx_queue_len: Max frames per queue allowed
1597 * @tx_global_lock: XXX: need comments on this one
1598 *
1599 * @xps_maps: XXX: need comments on this one
1600 * @miniq_egress: clsact qdisc specific data for
1601 * egress processing
1602 * @watchdog_timeo: Represents the timeout that is used by
1603 * the watchdog (see dev_watchdog())
1604 * @watchdog_timer: List of timers
1605 *
1606 * @pcpu_refcnt: Number of references to this device
1607 * @todo_list: Delayed register/unregister
1608 * @link_watch_list: XXX: need comments on this one
1609 *
1610 * @reg_state: Register/unregister state machine
1611 * @dismantle: Device is going to be freed
1612 * @rtnl_link_state: This enum represents the phases of creating
1613 * a new link
1614 *
1615 * @needs_free_netdev: Should unregister perform free_netdev?
1616 * @priv_destructor: Called from unregister
1617 * @npinfo: XXX: need comments on this one
1618 * @nd_net: Network namespace this network device is inside
1619 *
1620 * @ml_priv: Mid-layer private
1621 * @lstats: Loopback statistics
1622 * @tstats: Tunnel statistics
1623 * @dstats: Dummy statistics
1624 * @vstats: Virtual ethernet statistics
1625 *
1626 * @garp_port: GARP
1627 * @mrp_port: MRP
1628 *
1629 * @dev: Class/net/name entry
1630 * @sysfs_groups: Space for optional device, statistics and wireless
1631 * sysfs groups
1632 *
1633 * @sysfs_rx_queue_group: Space for optional per-rx queue attributes
1634 * @rtnl_link_ops: Rtnl_link_ops
1635 *
1636 * @gso_max_size: Maximum size of generic segmentation offload
1637 * @gso_max_segs: Maximum number of segments that can be passed to the
1638 * NIC for GSO
1639 *
1640 * @dcbnl_ops: Data Center Bridging netlink ops
1641 * @num_tc: Number of traffic classes in the net device
1642 * @tc_to_txq: XXX: need comments on this one
1643 * @prio_tc_map: XXX: need comments on this one
1644 *
1645 * @fcoe_ddp_xid: Max exchange id for FCoE LRO by ddp
1646 *
1647 * @priomap: XXX: need comments on this one
1648 * @phydev: Physical device may attach itself
1649 * for hardware timestamping
1650 *
1651 * @qdisc_tx_busylock: lockdep class annotating Qdisc->busylock spinlock
1652 * @qdisc_running_key: lockdep class annotating Qdisc->running seqcount
1653 *
1654 * @proto_down: protocol port state information can be sent to the
1655 * switch driver and used to set the phys state of the
1656 * switch port.
1657 *
1658 * FIXME: cleanup struct net_device such that network protocol info
1659 * moves out.
1660 */
1661
1662 struct net_device {
1663 char name[IFNAMSIZ];
1664 struct hlist_node name_hlist;
1665 struct dev_ifalias __rcu *ifalias;
1666 /*
1667 * I/O specific fields
1668 * FIXME: Merge these and struct ifmap into one
1669 */
1670 unsigned long mem_end;
1671 unsigned long mem_start;
1672 unsigned long base_addr;
1673 int irq;
1674
1675 /*
1676 * Some hardware also needs these fields (state,dev_list,
1677 * napi_list,unreg_list,close_list) but they are not
1678 * part of the usual set specified in Space.c.
1679 */
1680
1681 unsigned long state;
1682
1683 struct list_head dev_list;
1684 struct list_head napi_list;
1685 struct list_head unreg_list;
1686 struct list_head close_list;
1687 struct list_head ptype_all;
1688 struct list_head ptype_specific;
1689
1690 struct {
1691 struct list_head upper;
1692 struct list_head lower;
1693 } adj_list;
1694
1695 netdev_features_t features;
1696 netdev_features_t hw_features;
1697 netdev_features_t wanted_features;
1698 netdev_features_t vlan_features;
1699 netdev_features_t hw_enc_features;
1700 netdev_features_t mpls_features;
1701 netdev_features_t gso_partial_features;
1702
1703 int ifindex;
1704 int group;
1705
1706 struct net_device_stats stats;
1707
1708 atomic_long_t rx_dropped;
1709 atomic_long_t tx_dropped;
1710 atomic_long_t rx_nohandler;
1711
1712 /* Stats to monitor link on/off, flapping */
1713 atomic_t carrier_up_count;
1714 atomic_t carrier_down_count;
1715
1716 #ifdef CONFIG_WIRELESS_EXT
1717 const struct iw_handler_def *wireless_handlers;
1718 struct iw_public_data *wireless_data;
1719 #endif
1720 const struct net_device_ops *netdev_ops;
1721 const struct ethtool_ops *ethtool_ops;
1722 #ifdef CONFIG_NET_SWITCHDEV
1723 const struct switchdev_ops *switchdev_ops;
1724 #endif
1725 #ifdef CONFIG_NET_L3_MASTER_DEV
1726 const struct l3mdev_ops *l3mdev_ops;
1727 #endif
1728 #if IS_ENABLED(CONFIG_IPV6)
1729 const struct ndisc_ops *ndisc_ops;
1730 #endif
1731
1732 #ifdef CONFIG_XFRM
1733 const struct xfrmdev_ops *xfrmdev_ops;
1734 #endif
1735
1736 const struct header_ops *header_ops;
1737
1738 unsigned int flags;
1739 unsigned int priv_flags;
1740
1741 unsigned short gflags;
1742 unsigned short padded;
1743
1744 unsigned char operstate;
1745 unsigned char link_mode;
1746
1747 unsigned char if_port;
1748 unsigned char dma;
1749
1750 /* Note : dev->mtu is often read without holding a lock.
1751 * Writers usually hold RTNL.
1752 * It is recommended to use READ_ONCE() to annotate the reads,
1753 * and to use WRITE_ONCE() to annotate the writes.
1754 */
1755 unsigned int mtu;
1756 unsigned int min_mtu;
1757 unsigned int max_mtu;
1758 unsigned short type;
1759 unsigned short hard_header_len;
1760 unsigned char min_header_len;
1761
1762 unsigned short needed_headroom;
1763 unsigned short needed_tailroom;
1764
1765 /* Interface address info. */
1766 unsigned char perm_addr[MAX_ADDR_LEN];
1767 unsigned char addr_assign_type;
1768 unsigned char addr_len;
1769 unsigned short neigh_priv_len;
1770 unsigned short dev_id;
1771 unsigned short dev_port;
1772 spinlock_t addr_list_lock;
1773 unsigned char name_assign_type;
1774 bool uc_promisc;
1775 struct netdev_hw_addr_list uc;
1776 struct netdev_hw_addr_list mc;
1777 struct netdev_hw_addr_list dev_addrs;
1778
1779 #ifdef CONFIG_SYSFS
1780 struct kset *queues_kset;
1781 #endif
1782 unsigned int promiscuity;
1783 unsigned int allmulti;
1784
1785
1786 /* Protocol-specific pointers */
1787
1788 #if IS_ENABLED(CONFIG_VLAN_8021Q)
1789 struct vlan_info __rcu *vlan_info;
1790 #endif
1791 #if IS_ENABLED(CONFIG_NET_DSA)
1792 struct dsa_port *dsa_ptr;
1793 #endif
1794 #if IS_ENABLED(CONFIG_TIPC)
1795 struct tipc_bearer __rcu *tipc_ptr;
1796 #endif
1797 void *atalk_ptr;
1798 struct in_device __rcu *ip_ptr;
1799 struct dn_dev __rcu *dn_ptr;
1800 struct inet6_dev __rcu *ip6_ptr;
1801 void *ax25_ptr;
1802 struct wireless_dev *ieee80211_ptr;
1803 struct wpan_dev *ieee802154_ptr;
1804 #if IS_ENABLED(CONFIG_MPLS_ROUTING)
1805 struct mpls_dev __rcu *mpls_ptr;
1806 #endif
1807
1808 /*
1809 * Cache lines mostly used on receive path (including eth_type_trans())
1810 */
1811 /* Interface address info used in eth_type_trans() */
1812 unsigned char *dev_addr;
1813
1814 #ifdef CONFIG_SYSFS
1815 struct netdev_rx_queue *_rx;
1816
1817 unsigned int num_rx_queues;
1818 unsigned int real_num_rx_queues;
1819 #endif
1820
1821 struct bpf_prog __rcu *xdp_prog;
1822 unsigned long gro_flush_timeout;
1823 rx_handler_func_t __rcu *rx_handler;
1824 void __rcu *rx_handler_data;
1825
1826 #ifdef CONFIG_NET_CLS_ACT
1827 struct mini_Qdisc __rcu *miniq_ingress;
1828 #endif
1829 struct netdev_queue __rcu *ingress_queue;
1830 #ifdef CONFIG_NETFILTER_INGRESS
1831 struct nf_hook_entries __rcu *nf_hooks_ingress;
1832 #endif
1833
1834 unsigned char broadcast[MAX_ADDR_LEN];
1835 #ifdef CONFIG_RFS_ACCEL
1836 struct cpu_rmap *rx_cpu_rmap;
1837 #endif
1838 struct hlist_node index_hlist;
1839
1840 /*
1841 * Cache lines mostly used on transmit path
1842 */
1843 struct netdev_queue *_tx ____cacheline_aligned_in_smp;
1844 unsigned int num_tx_queues;
1845 unsigned int real_num_tx_queues;
1846 struct Qdisc *qdisc;
1847 #ifdef CONFIG_NET_SCHED
1848 DECLARE_HASHTABLE (qdisc_hash, 4);
1849 #endif
1850 unsigned int tx_queue_len;
1851 spinlock_t tx_global_lock;
1852 int watchdog_timeo;
1853
1854 #ifdef CONFIG_XPS
1855 struct xps_dev_maps __rcu *xps_maps;
1856 #endif
1857 #ifdef CONFIG_NET_CLS_ACT
1858 struct mini_Qdisc __rcu *miniq_egress;
1859 #endif
1860
1861 /* These may be needed for future network-power-down code. */
1862 struct timer_list watchdog_timer;
1863
1864 int __percpu *pcpu_refcnt;
1865 struct list_head todo_list;
1866
1867 struct list_head link_watch_list;
1868
1869 enum { NETREG_UNINITIALIZED=0,
1870 NETREG_REGISTERED, /* completed register_netdevice */
1871 NETREG_UNREGISTERING, /* called unregister_netdevice */
1872 NETREG_UNREGISTERED, /* completed unregister todo */
1873 NETREG_RELEASED, /* called free_netdev */
1874 NETREG_DUMMY, /* dummy device for NAPI poll */
1875 } reg_state:8;
1876
1877 bool dismantle;
1878
1879 enum {
1880 RTNL_LINK_INITIALIZED,
1881 RTNL_LINK_INITIALIZING,
1882 } rtnl_link_state:16;
1883
1884 bool needs_free_netdev;
1885 void (*priv_destructor)(struct net_device *dev);
1886
1887 #ifdef CONFIG_NETPOLL
1888 struct netpoll_info __rcu *npinfo;
1889 #endif
1890
1891 possible_net_t nd_net;
1892
1893 /* mid-layer private */
1894 union {
1895 void *ml_priv;
1896 struct pcpu_lstats __percpu *lstats;
1897 struct pcpu_sw_netstats __percpu *tstats;
1898 struct pcpu_dstats __percpu *dstats;
1899 struct pcpu_vstats __percpu *vstats;
1900 };
1901
1902 #if IS_ENABLED(CONFIG_GARP)
1903 struct garp_port __rcu *garp_port;
1904 #endif
1905 #if IS_ENABLED(CONFIG_MRP)
1906 struct mrp_port __rcu *mrp_port;
1907 #endif
1908
1909 struct device dev;
1910 const struct attribute_group *sysfs_groups[4];
1911 const struct attribute_group *sysfs_rx_queue_group;
1912
1913 const struct rtnl_link_ops *rtnl_link_ops;
1914
1915 /* for setting kernel sock attribute on TCP connection setup */
1916 #define GSO_MAX_SIZE 65536
1917 unsigned int gso_max_size;
1918 #define GSO_MAX_SEGS 65535
1919 u16 gso_max_segs;
1920
1921 #ifdef CONFIG_DCB
1922 const struct dcbnl_rtnl_ops *dcbnl_ops;
1923 #endif
1924 u8 num_tc;
1925 struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
1926 u8 prio_tc_map[TC_BITMASK + 1];
1927
1928 #if IS_ENABLED(CONFIG_FCOE)
1929 unsigned int fcoe_ddp_xid;
1930 #endif
1931 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
1932 struct netprio_map __rcu *priomap;
1933 #endif
1934 struct phy_device *phydev;
1935 struct lock_class_key *qdisc_tx_busylock;
1936 struct lock_class_key *qdisc_running_key;
1937 bool proto_down;
1938 };
1939 #define to_net_dev(d) container_of(d, struct net_device, dev)
1940
1941 static inline bool netif_elide_gro(const struct net_device *dev)
1942 {
1943 if (!(dev->features & NETIF_F_GRO) || dev->xdp_prog)
1944 return true;
1945 return false;
1946 }
1947
1948 #define NETDEV_ALIGN 32
1949
1950 static inline
1951 int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
1952 {
1953 return dev->prio_tc_map[prio & TC_BITMASK];
1954 }
1955
1956 static inline
1957 int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc)
1958 {
1959 if (tc >= dev->num_tc)
1960 return -EINVAL;
1961
1962 dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK;
1963 return 0;
1964 }
1965
1966 int netdev_txq_to_tc(struct net_device *dev, unsigned int txq);
1967 void netdev_reset_tc(struct net_device *dev);
1968 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset);
1969 int netdev_set_num_tc(struct net_device *dev, u8 num_tc);
1970
1971 static inline
1972 int netdev_get_num_tc(struct net_device *dev)
1973 {
1974 return dev->num_tc;
1975 }
1976
1977 static inline
1978 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
1979 unsigned int index)
1980 {
1981 return &dev->_tx[index];
1982 }
1983
1984 static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev,
1985 const struct sk_buff *skb)
1986 {
1987 return netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
1988 }
1989
1990 static inline void netdev_for_each_tx_queue(struct net_device *dev,
1991 void (*f)(struct net_device *,
1992 struct netdev_queue *,
1993 void *),
1994 void *arg)
1995 {
1996 unsigned int i;
1997
1998 for (i = 0; i < dev->num_tx_queues; i++)
1999 f(dev, &dev->_tx[i], arg);
2000 }
2001
2002 #define netdev_lockdep_set_classes(dev) \
2003 { \
2004 static struct lock_class_key qdisc_tx_busylock_key; \
2005 static struct lock_class_key qdisc_running_key; \
2006 static struct lock_class_key qdisc_xmit_lock_key; \
2007 static struct lock_class_key dev_addr_list_lock_key; \
2008 unsigned int i; \
2009 \
2010 (dev)->qdisc_tx_busylock = &qdisc_tx_busylock_key; \
2011 (dev)->qdisc_running_key = &qdisc_running_key; \
2012 lockdep_set_class(&(dev)->addr_list_lock, \
2013 &dev_addr_list_lock_key); \
2014 for (i = 0; i < (dev)->num_tx_queues; i++) \
2015 lockdep_set_class(&(dev)->_tx[i]._xmit_lock, \
2016 &qdisc_xmit_lock_key); \
2017 }
2018
2019 struct netdev_queue *netdev_pick_tx(struct net_device *dev,
2020 struct sk_buff *skb,
2021 void *accel_priv);
2022
2023 /* returns the headroom that the master device needs to take in account
2024 * when forwarding to this dev
2025 */
2026 static inline unsigned netdev_get_fwd_headroom(struct net_device *dev)
2027 {
2028 return dev->priv_flags & IFF_PHONY_HEADROOM ? 0 : dev->needed_headroom;
2029 }
2030
2031 static inline void netdev_set_rx_headroom(struct net_device *dev, int new_hr)
2032 {
2033 if (dev->netdev_ops->ndo_set_rx_headroom)
2034 dev->netdev_ops->ndo_set_rx_headroom(dev, new_hr);
2035 }
2036
2037 /* set the device rx headroom to the dev's default */
2038 static inline void netdev_reset_rx_headroom(struct net_device *dev)
2039 {
2040 netdev_set_rx_headroom(dev, -1);
2041 }
2042
2043 /*
2044 * Net namespace inlines
2045 */
2046 static inline
2047 struct net *dev_net(const struct net_device *dev)
2048 {
2049 return read_pnet(&dev->nd_net);
2050 }
2051
2052 static inline
2053 void dev_net_set(struct net_device *dev, struct net *net)
2054 {
2055 write_pnet(&dev->nd_net, net);
2056 }
2057
2058 /**
2059 * netdev_priv - access network device private data
2060 * @dev: network device
2061 *
2062 * Get network device private data
2063 */
2064 static inline void *netdev_priv(const struct net_device *dev)
2065 {
2066 return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
2067 }
2068
2069 /* Set the sysfs physical device reference for the network logical device
2070 * if set prior to registration will cause a symlink during initialization.
2071 */
2072 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev))
2073
2074 /* Set the sysfs device type for the network logical device to allow
2075 * fine-grained identification of different network device types. For
2076 * example Ethernet, Wireless LAN, Bluetooth, WiMAX etc.
2077 */
2078 #define SET_NETDEV_DEVTYPE(net, devtype) ((net)->dev.type = (devtype))
2079
2080 /* Default NAPI poll() weight
2081 * Device drivers are strongly advised to not use bigger value
2082 */
2083 #define NAPI_POLL_WEIGHT 64
2084
2085 /**
2086 * netif_napi_add - initialize a NAPI context
2087 * @dev: network device
2088 * @napi: NAPI context
2089 * @poll: polling function
2090 * @weight: default weight
2091 *
2092 * netif_napi_add() must be used to initialize a NAPI context prior to calling
2093 * *any* of the other NAPI-related functions.
2094 */
2095 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
2096 int (*poll)(struct napi_struct *, int), int weight);
2097
2098 /**
2099 * netif_tx_napi_add - initialize a NAPI context
2100 * @dev: network device
2101 * @napi: NAPI context
2102 * @poll: polling function
2103 * @weight: default weight
2104 *
2105 * This variant of netif_napi_add() should be used from drivers using NAPI
2106 * to exclusively poll a TX queue.
2107 * This will avoid we add it into napi_hash[], thus polluting this hash table.
2108 */
2109 static inline void netif_tx_napi_add(struct net_device *dev,
2110 struct napi_struct *napi,
2111 int (*poll)(struct napi_struct *, int),
2112 int weight)
2113 {
2114 set_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state);
2115 netif_napi_add(dev, napi, poll, weight);
2116 }
2117
2118 /**
2119 * netif_napi_del - remove a NAPI context
2120 * @napi: NAPI context
2121 *
2122 * netif_napi_del() removes a NAPI context from the network device NAPI list
2123 */
2124 void netif_napi_del(struct napi_struct *napi);
2125
2126 struct napi_gro_cb {
2127 /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
2128 void *frag0;
2129
2130 /* Length of frag0. */
2131 unsigned int frag0_len;
2132
2133 /* This indicates where we are processing relative to skb->data. */
2134 int data_offset;
2135
2136 /* This is non-zero if the packet cannot be merged with the new skb. */
2137 u16 flush;
2138
2139 /* Save the IP ID here and check when we get to the transport layer */
2140 u16 flush_id;
2141
2142 /* Number of segments aggregated. */
2143 u16 count;
2144
2145 /* Start offset for remote checksum offload */
2146 u16 gro_remcsum_start;
2147
2148 /* jiffies when first packet was created/queued */
2149 unsigned long age;
2150
2151 /* Used in ipv6_gro_receive() and foo-over-udp */
2152 u16 proto;
2153
2154 /* This is non-zero if the packet may be of the same flow. */
2155 u8 same_flow:1;
2156
2157 /* Used in tunnel GRO receive */
2158 u8 encap_mark:1;
2159
2160 /* GRO checksum is valid */
2161 u8 csum_valid:1;
2162
2163 /* Number of checksums via CHECKSUM_UNNECESSARY */
2164 u8 csum_cnt:3;
2165
2166 /* Free the skb? */
2167 u8 free:2;
2168 #define NAPI_GRO_FREE 1
2169 #define NAPI_GRO_FREE_STOLEN_HEAD 2
2170
2171 /* Used in foo-over-udp, set in udp[46]_gro_receive */
2172 u8 is_ipv6:1;
2173
2174 /* Used in GRE, set in fou/gue_gro_receive */
2175 u8 is_fou:1;
2176
2177 /* Used to determine if flush_id can be ignored */
2178 u8 is_atomic:1;
2179
2180 /* Number of gro_receive callbacks this packet already went through */
2181 u8 recursion_counter:4;
2182
2183 /* 1 bit hole */
2184
2185 /* used to support CHECKSUM_COMPLETE for tunneling protocols */
2186 __wsum csum;
2187
2188 /* used in skb_gro_receive() slow path */
2189 struct sk_buff *last;
2190 };
2191
2192 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
2193
2194 #define GRO_RECURSION_LIMIT 15
2195 static inline int gro_recursion_inc_test(struct sk_buff *skb)
2196 {
2197 return ++NAPI_GRO_CB(skb)->recursion_counter == GRO_RECURSION_LIMIT;
2198 }
2199
2200 typedef struct sk_buff **(*gro_receive_t)(struct sk_buff **, struct sk_buff *);
2201 static inline struct sk_buff **call_gro_receive(gro_receive_t cb,
2202 struct sk_buff **head,
2203 struct sk_buff *skb)
2204 {
2205 if (unlikely(gro_recursion_inc_test(skb))) {
2206 NAPI_GRO_CB(skb)->flush |= 1;
2207 return NULL;
2208 }
2209
2210 return cb(head, skb);
2211 }
2212
2213 typedef struct sk_buff **(*gro_receive_sk_t)(struct sock *, struct sk_buff **,
2214 struct sk_buff *);
2215 static inline struct sk_buff **call_gro_receive_sk(gro_receive_sk_t cb,
2216 struct sock *sk,
2217 struct sk_buff **head,
2218 struct sk_buff *skb)
2219 {
2220 if (unlikely(gro_recursion_inc_test(skb))) {
2221 NAPI_GRO_CB(skb)->flush |= 1;
2222 return NULL;
2223 }
2224
2225 return cb(sk, head, skb);
2226 }
2227
2228 struct packet_type {
2229 __be16 type; /* This is really htons(ether_type). */
2230 struct net_device *dev; /* NULL is wildcarded here */
2231 int (*func) (struct sk_buff *,
2232 struct net_device *,
2233 struct packet_type *,
2234 struct net_device *);
2235 bool (*id_match)(struct packet_type *ptype,
2236 struct sock *sk);
2237 void *af_packet_priv;
2238 struct list_head list;
2239 };
2240
2241 struct offload_callbacks {
2242 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
2243 netdev_features_t features);
2244 struct sk_buff **(*gro_receive)(struct sk_buff **head,
2245 struct sk_buff *skb);
2246 int (*gro_complete)(struct sk_buff *skb, int nhoff);
2247 };
2248
2249 struct packet_offload {
2250 __be16 type; /* This is really htons(ether_type). */
2251 u16 priority;
2252 struct offload_callbacks callbacks;
2253 struct list_head list;
2254 };
2255
2256 /* often modified stats are per-CPU, other are shared (netdev->stats) */
2257 struct pcpu_sw_netstats {
2258 u64 rx_packets;
2259 u64 rx_bytes;
2260 u64 tx_packets;
2261 u64 tx_bytes;
2262 struct u64_stats_sync syncp;
2263 };
2264
2265 #define __netdev_alloc_pcpu_stats(type, gfp) \
2266 ({ \
2267 typeof(type) __percpu *pcpu_stats = alloc_percpu_gfp(type, gfp);\
2268 if (pcpu_stats) { \
2269 int __cpu; \
2270 for_each_possible_cpu(__cpu) { \
2271 typeof(type) *stat; \
2272 stat = per_cpu_ptr(pcpu_stats, __cpu); \
2273 u64_stats_init(&stat->syncp); \
2274 } \
2275 } \
2276 pcpu_stats; \
2277 })
2278
2279 #define netdev_alloc_pcpu_stats(type) \
2280 __netdev_alloc_pcpu_stats(type, GFP_KERNEL)
2281
2282 enum netdev_lag_tx_type {
2283 NETDEV_LAG_TX_TYPE_UNKNOWN,
2284 NETDEV_LAG_TX_TYPE_RANDOM,
2285 NETDEV_LAG_TX_TYPE_BROADCAST,
2286 NETDEV_LAG_TX_TYPE_ROUNDROBIN,
2287 NETDEV_LAG_TX_TYPE_ACTIVEBACKUP,
2288 NETDEV_LAG_TX_TYPE_HASH,
2289 };
2290
2291 struct netdev_lag_upper_info {
2292 enum netdev_lag_tx_type tx_type;
2293 };
2294
2295 struct netdev_lag_lower_state_info {
2296 u8 link_up : 1,
2297 tx_enabled : 1;
2298 };
2299
2300 #include <linux/notifier.h>
2301
2302 /* netdevice notifier chain. Please remember to update the rtnetlink
2303 * notification exclusion list in rtnetlink_event() when adding new
2304 * types.
2305 */
2306 #define NETDEV_UP 0x0001 /* For now you can't veto a device up/down */
2307 #define NETDEV_DOWN 0x0002
2308 #define NETDEV_REBOOT 0x0003 /* Tell a protocol stack a network interface
2309 detected a hardware crash and restarted
2310 - we can use this eg to kick tcp sessions
2311 once done */
2312 #define NETDEV_CHANGE 0x0004 /* Notify device state change */
2313 #define NETDEV_REGISTER 0x0005
2314 #define NETDEV_UNREGISTER 0x0006
2315 #define NETDEV_CHANGEMTU 0x0007 /* notify after mtu change happened */
2316 #define NETDEV_CHANGEADDR 0x0008
2317 #define NETDEV_GOING_DOWN 0x0009
2318 #define NETDEV_CHANGENAME 0x000A
2319 #define NETDEV_FEAT_CHANGE 0x000B
2320 #define NETDEV_BONDING_FAILOVER 0x000C
2321 #define NETDEV_PRE_UP 0x000D
2322 #define NETDEV_PRE_TYPE_CHANGE 0x000E
2323 #define NETDEV_POST_TYPE_CHANGE 0x000F
2324 #define NETDEV_POST_INIT 0x0010
2325 #define NETDEV_UNREGISTER_FINAL 0x0011
2326 #define NETDEV_RELEASE 0x0012
2327 #define NETDEV_NOTIFY_PEERS 0x0013
2328 #define NETDEV_JOIN 0x0014
2329 #define NETDEV_CHANGEUPPER 0x0015
2330 #define NETDEV_RESEND_IGMP 0x0016
2331 #define NETDEV_PRECHANGEMTU 0x0017 /* notify before mtu change happened */
2332 #define NETDEV_CHANGEINFODATA 0x0018
2333 #define NETDEV_BONDING_INFO 0x0019
2334 #define NETDEV_PRECHANGEUPPER 0x001A
2335 #define NETDEV_CHANGELOWERSTATE 0x001B
2336 #define NETDEV_UDP_TUNNEL_PUSH_INFO 0x001C
2337 #define NETDEV_UDP_TUNNEL_DROP_INFO 0x001D
2338 #define NETDEV_CHANGE_TX_QUEUE_LEN 0x001E
2339
2340 int register_netdevice_notifier(struct notifier_block *nb);
2341 int unregister_netdevice_notifier(struct notifier_block *nb);
2342
2343 struct netdev_notifier_info {
2344 struct net_device *dev;
2345 struct netlink_ext_ack *extack;
2346 };
2347
2348 struct netdev_notifier_info_ext {
2349 struct netdev_notifier_info info; /* must be first */
2350 union {
2351 u32 mtu;
2352 } ext;
2353 };
2354
2355 struct netdev_notifier_change_info {
2356 struct netdev_notifier_info info; /* must be first */
2357 unsigned int flags_changed;
2358 };
2359
2360 struct netdev_notifier_changeupper_info {
2361 struct netdev_notifier_info info; /* must be first */
2362 struct net_device *upper_dev; /* new upper dev */
2363 bool master; /* is upper dev master */
2364 bool linking; /* is the notification for link or unlink */
2365 void *upper_info; /* upper dev info */
2366 };
2367
2368 struct netdev_notifier_changelowerstate_info {
2369 struct netdev_notifier_info info; /* must be first */
2370 void *lower_state_info; /* is lower dev state */
2371 };
2372
2373 static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
2374 struct net_device *dev)
2375 {
2376 info->dev = dev;
2377 info->extack = NULL;
2378 }
2379
2380 static inline struct net_device *
2381 netdev_notifier_info_to_dev(const struct netdev_notifier_info *info)
2382 {
2383 return info->dev;
2384 }
2385
2386 static inline struct netlink_ext_ack *
2387 netdev_notifier_info_to_extack(const struct netdev_notifier_info *info)
2388 {
2389 return info->extack;
2390 }
2391
2392 int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
2393
2394
2395 extern rwlock_t dev_base_lock; /* Device list lock */
2396
2397 #define for_each_netdev(net, d) \
2398 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
2399 #define for_each_netdev_reverse(net, d) \
2400 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
2401 #define for_each_netdev_rcu(net, d) \
2402 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
2403 #define for_each_netdev_safe(net, d, n) \
2404 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
2405 #define for_each_netdev_continue(net, d) \
2406 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
2407 #define for_each_netdev_continue_rcu(net, d) \
2408 list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
2409 #define for_each_netdev_in_bond_rcu(bond, slave) \
2410 for_each_netdev_rcu(&init_net, slave) \
2411 if (netdev_master_upper_dev_get_rcu(slave) == (bond))
2412 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list)
2413
2414 static inline struct net_device *next_net_device(struct net_device *dev)
2415 {
2416 struct list_head *lh;
2417 struct net *net;
2418
2419 net = dev_net(dev);
2420 lh = dev->dev_list.next;
2421 return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
2422 }
2423
2424 static inline struct net_device *next_net_device_rcu(struct net_device *dev)
2425 {
2426 struct list_head *lh;
2427 struct net *net;
2428
2429 net = dev_net(dev);
2430 lh = rcu_dereference(list_next_rcu(&dev->dev_list));
2431 return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
2432 }
2433
2434 static inline struct net_device *first_net_device(struct net *net)
2435 {
2436 return list_empty(&net->dev_base_head) ? NULL :
2437 net_device_entry(net->dev_base_head.next);
2438 }
2439
2440 static inline struct net_device *first_net_device_rcu(struct net *net)
2441 {
2442 struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head));
2443
2444 return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
2445 }
2446
2447 int netdev_boot_setup_check(struct net_device *dev);
2448 unsigned long netdev_boot_base(const char *prefix, int unit);
2449 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
2450 const char *hwaddr);
2451 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
2452 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
2453 void dev_add_pack(struct packet_type *pt);
2454 void dev_remove_pack(struct packet_type *pt);
2455 void __dev_remove_pack(struct packet_type *pt);
2456 void dev_add_offload(struct packet_offload *po);
2457 void dev_remove_offload(struct packet_offload *po);
2458
2459 int dev_get_iflink(const struct net_device *dev);
2460 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb);
2461 struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags,
2462 unsigned short mask);
2463 struct net_device *dev_get_by_name(struct net *net, const char *name);
2464 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name);
2465 struct net_device *__dev_get_by_name(struct net *net, const char *name);
2466 int dev_alloc_name(struct net_device *dev, const char *name);
2467 int dev_open(struct net_device *dev);
2468 void dev_close(struct net_device *dev);
2469 void dev_close_many(struct list_head *head, bool unlink);
2470 void dev_disable_lro(struct net_device *dev);
2471 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *newskb);
2472 int dev_queue_xmit(struct sk_buff *skb);
2473 int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv);
2474 int register_netdevice(struct net_device *dev);
2475 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head);
2476 void unregister_netdevice_many(struct list_head *head);
2477 static inline void unregister_netdevice(struct net_device *dev)
2478 {
2479 unregister_netdevice_queue(dev, NULL);
2480 }
2481
2482 int netdev_refcnt_read(const struct net_device *dev);
2483 void free_netdev(struct net_device *dev);
2484 void netdev_freemem(struct net_device *dev);
2485 void synchronize_net(void);
2486 int init_dummy_netdev(struct net_device *dev);
2487
2488 DECLARE_PER_CPU(int, xmit_recursion);
2489 #define XMIT_RECURSION_LIMIT 10
2490
2491 static inline int dev_recursion_level(void)
2492 {
2493 return this_cpu_read(xmit_recursion);
2494 }
2495
2496 struct net_device *dev_get_by_index(struct net *net, int ifindex);
2497 struct net_device *__dev_get_by_index(struct net *net, int ifindex);
2498 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);
2499 struct net_device *dev_get_by_napi_id(unsigned int napi_id);
2500 int netdev_get_name(struct net *net, char *name, int ifindex);
2501 int dev_restart(struct net_device *dev);
2502 int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb);
2503
2504 static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
2505 {
2506 return NAPI_GRO_CB(skb)->data_offset;
2507 }
2508
2509 static inline unsigned int skb_gro_len(const struct sk_buff *skb)
2510 {
2511 return skb->len - NAPI_GRO_CB(skb)->data_offset;
2512 }
2513
2514 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
2515 {
2516 NAPI_GRO_CB(skb)->data_offset += len;
2517 }
2518
2519 static inline void *skb_gro_header_fast(struct sk_buff *skb,
2520 unsigned int offset)
2521 {
2522 return NAPI_GRO_CB(skb)->frag0 + offset;
2523 }
2524
2525 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
2526 {
2527 return NAPI_GRO_CB(skb)->frag0_len < hlen;
2528 }
2529
2530 static inline void skb_gro_frag0_invalidate(struct sk_buff *skb)
2531 {
2532 NAPI_GRO_CB(skb)->frag0 = NULL;
2533 NAPI_GRO_CB(skb)->frag0_len = 0;
2534 }
2535
2536 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
2537 unsigned int offset)
2538 {
2539 if (!pskb_may_pull(skb, hlen))
2540 return NULL;
2541
2542 skb_gro_frag0_invalidate(skb);
2543 return skb->data + offset;
2544 }
2545
2546 static inline void *skb_gro_network_header(struct sk_buff *skb)
2547 {
2548 return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
2549 skb_network_offset(skb);
2550 }
2551
2552 static inline void skb_gro_postpull_rcsum(struct sk_buff *skb,
2553 const void *start, unsigned int len)
2554 {
2555 if (NAPI_GRO_CB(skb)->csum_valid)
2556 NAPI_GRO_CB(skb)->csum = csum_sub(NAPI_GRO_CB(skb)->csum,
2557 csum_partial(start, len, 0));
2558 }
2559
2560 /* GRO checksum functions. These are logical equivalents of the normal
2561 * checksum functions (in skbuff.h) except that they operate on the GRO
2562 * offsets and fields in sk_buff.
2563 */
2564
2565 __sum16 __skb_gro_checksum_complete(struct sk_buff *skb);
2566
2567 static inline bool skb_at_gro_remcsum_start(struct sk_buff *skb)
2568 {
2569 return (NAPI_GRO_CB(skb)->gro_remcsum_start == skb_gro_offset(skb));
2570 }
2571
2572 static inline bool __skb_gro_checksum_validate_needed(struct sk_buff *skb,
2573 bool zero_okay,
2574 __sum16 check)
2575 {
2576 return ((skb->ip_summed != CHECKSUM_PARTIAL ||
2577 skb_checksum_start_offset(skb) <
2578 skb_gro_offset(skb)) &&
2579 !skb_at_gro_remcsum_start(skb) &&
2580 NAPI_GRO_CB(skb)->csum_cnt == 0 &&
2581 (!zero_okay || check));
2582 }
2583
2584 static inline __sum16 __skb_gro_checksum_validate_complete(struct sk_buff *skb,
2585 __wsum psum)
2586 {
2587 if (NAPI_GRO_CB(skb)->csum_valid &&
2588 !csum_fold(csum_add(psum, NAPI_GRO_CB(skb)->csum)))
2589 return 0;
2590
2591 NAPI_GRO_CB(skb)->csum = psum;
2592
2593 return __skb_gro_checksum_complete(skb);
2594 }
2595
2596 static inline void skb_gro_incr_csum_unnecessary(struct sk_buff *skb)
2597 {
2598 if (NAPI_GRO_CB(skb)->csum_cnt > 0) {
2599 /* Consume a checksum from CHECKSUM_UNNECESSARY */
2600 NAPI_GRO_CB(skb)->csum_cnt--;
2601 } else {
2602 /* Update skb for CHECKSUM_UNNECESSARY and csum_level when we
2603 * verified a new top level checksum or an encapsulated one
2604 * during GRO. This saves work if we fallback to normal path.
2605 */
2606 __skb_incr_checksum_unnecessary(skb);
2607 }
2608 }
2609
2610 #define __skb_gro_checksum_validate(skb, proto, zero_okay, check, \
2611 compute_pseudo) \
2612 ({ \
2613 __sum16 __ret = 0; \
2614 if (__skb_gro_checksum_validate_needed(skb, zero_okay, check)) \
2615 __ret = __skb_gro_checksum_validate_complete(skb, \
2616 compute_pseudo(skb, proto)); \
2617 if (!__ret) \
2618 skb_gro_incr_csum_unnecessary(skb); \
2619 __ret; \
2620 })
2621
2622 #define skb_gro_checksum_validate(skb, proto, compute_pseudo) \
2623 __skb_gro_checksum_validate(skb, proto, false, 0, compute_pseudo)
2624
2625 #define skb_gro_checksum_validate_zero_check(skb, proto, check, \
2626 compute_pseudo) \
2627 __skb_gro_checksum_validate(skb, proto, true, check, compute_pseudo)
2628
2629 #define skb_gro_checksum_simple_validate(skb) \
2630 __skb_gro_checksum_validate(skb, 0, false, 0, null_compute_pseudo)
2631
2632 static inline bool __skb_gro_checksum_convert_check(struct sk_buff *skb)
2633 {
2634 return (NAPI_GRO_CB(skb)->csum_cnt == 0 &&
2635 !NAPI_GRO_CB(skb)->csum_valid);
2636 }
2637
2638 static inline void __skb_gro_checksum_convert(struct sk_buff *skb,
2639 __sum16 check, __wsum pseudo)
2640 {
2641 NAPI_GRO_CB(skb)->csum = ~pseudo;
2642 NAPI_GRO_CB(skb)->csum_valid = 1;
2643 }
2644
2645 #define skb_gro_checksum_try_convert(skb, proto, check, compute_pseudo) \
2646 do { \
2647 if (__skb_gro_checksum_convert_check(skb)) \
2648 __skb_gro_checksum_convert(skb, check, \
2649 compute_pseudo(skb, proto)); \
2650 } while (0)
2651
2652 struct gro_remcsum {
2653 int offset;
2654 __wsum delta;
2655 };
2656
2657 static inline void skb_gro_remcsum_init(struct gro_remcsum *grc)
2658 {
2659 grc->offset = 0;
2660 grc->delta = 0;
2661 }
2662
2663 static inline void *skb_gro_remcsum_process(struct sk_buff *skb, void *ptr,
2664 unsigned int off, size_t hdrlen,
2665 int start, int offset,
2666 struct gro_remcsum *grc,
2667 bool nopartial)
2668 {
2669 __wsum delta;
2670 size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start);
2671
2672 BUG_ON(!NAPI_GRO_CB(skb)->csum_valid);
2673
2674 if (!nopartial) {
2675 NAPI_GRO_CB(skb)->gro_remcsum_start = off + hdrlen + start;
2676 return ptr;
2677 }
2678
2679 ptr = skb_gro_header_fast(skb, off);
2680 if (skb_gro_header_hard(skb, off + plen)) {
2681 ptr = skb_gro_header_slow(skb, off + plen, off);
2682 if (!ptr)
2683 return NULL;
2684 }
2685
2686 delta = remcsum_adjust(ptr + hdrlen, NAPI_GRO_CB(skb)->csum,
2687 start, offset);
2688
2689 /* Adjust skb->csum since we changed the packet */
2690 NAPI_GRO_CB(skb)->csum = csum_add(NAPI_GRO_CB(skb)->csum, delta);
2691
2692 grc->offset = off + hdrlen + offset;
2693 grc->delta = delta;
2694
2695 return ptr;
2696 }
2697
2698 static inline void skb_gro_remcsum_cleanup(struct sk_buff *skb,
2699 struct gro_remcsum *grc)
2700 {
2701 void *ptr;
2702 size_t plen = grc->offset + sizeof(u16);
2703
2704 if (!grc->delta)
2705 return;
2706
2707 ptr = skb_gro_header_fast(skb, grc->offset);
2708 if (skb_gro_header_hard(skb, grc->offset + sizeof(u16))) {
2709 ptr = skb_gro_header_slow(skb, plen, grc->offset);
2710 if (!ptr)
2711 return;
2712 }
2713
2714 remcsum_unadjust((__sum16 *)ptr, grc->delta);
2715 }
2716
2717 #ifdef CONFIG_XFRM_OFFLOAD
2718 static inline void skb_gro_flush_final(struct sk_buff *skb, struct sk_buff **pp, int flush)
2719 {
2720 if (PTR_ERR(pp) != -EINPROGRESS)
2721 NAPI_GRO_CB(skb)->flush |= flush;
2722 }
2723 static inline void skb_gro_flush_final_remcsum(struct sk_buff *skb,
2724 struct sk_buff **pp,
2725 int flush,
2726 struct gro_remcsum *grc)
2727 {
2728 if (PTR_ERR(pp) != -EINPROGRESS) {
2729 NAPI_GRO_CB(skb)->flush |= flush;
2730 skb_gro_remcsum_cleanup(skb, grc);
2731 skb->remcsum_offload = 0;
2732 }
2733 }
2734 #else
2735 static inline void skb_gro_flush_final(struct sk_buff *skb, struct sk_buff **pp, int flush)
2736 {
2737 NAPI_GRO_CB(skb)->flush |= flush;
2738 }
2739 static inline void skb_gro_flush_final_remcsum(struct sk_buff *skb,
2740 struct sk_buff **pp,
2741 int flush,
2742 struct gro_remcsum *grc)
2743 {
2744 NAPI_GRO_CB(skb)->flush |= flush;
2745 skb_gro_remcsum_cleanup(skb, grc);
2746 skb->remcsum_offload = 0;
2747 }
2748 #endif
2749
2750 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
2751 unsigned short type,
2752 const void *daddr, const void *saddr,
2753 unsigned int len)
2754 {
2755 if (!dev->header_ops || !dev->header_ops->create)
2756 return 0;
2757
2758 return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
2759 }
2760
2761 static inline int dev_parse_header(const struct sk_buff *skb,
2762 unsigned char *haddr)
2763 {
2764 const struct net_device *dev = skb->dev;
2765
2766 if (!dev->header_ops || !dev->header_ops->parse)
2767 return 0;
2768 return dev->header_ops->parse(skb, haddr);
2769 }
2770
2771 /* ll_header must have at least hard_header_len allocated */
2772 static inline bool dev_validate_header(const struct net_device *dev,
2773 char *ll_header, int len)
2774 {
2775 if (likely(len >= dev->hard_header_len))
2776 return true;
2777 if (len < dev->min_header_len)
2778 return false;
2779
2780 if (capable(CAP_SYS_RAWIO)) {
2781 memset(ll_header + len, 0, dev->hard_header_len - len);
2782 return true;
2783 }
2784
2785 if (dev->header_ops && dev->header_ops->validate)
2786 return dev->header_ops->validate(ll_header, len);
2787
2788 return false;
2789 }
2790
2791 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
2792 int register_gifconf(unsigned int family, gifconf_func_t *gifconf);
2793 static inline int unregister_gifconf(unsigned int family)
2794 {
2795 return register_gifconf(family, NULL);
2796 }
2797
2798 #ifdef CONFIG_NET_FLOW_LIMIT
2799 #define FLOW_LIMIT_HISTORY (1 << 7) /* must be ^2 and !overflow buckets */
2800 struct sd_flow_limit {
2801 u64 count;
2802 unsigned int num_buckets;
2803 unsigned int history_head;
2804 u16 history[FLOW_LIMIT_HISTORY];
2805 u8 buckets[];
2806 };
2807
2808 extern int netdev_flow_limit_table_len;
2809 #endif /* CONFIG_NET_FLOW_LIMIT */
2810
2811 /*
2812 * Incoming packets are placed on per-CPU queues
2813 */
2814 struct softnet_data {
2815 struct list_head poll_list;
2816 struct sk_buff_head process_queue;
2817
2818 /* stats */
2819 unsigned int processed;
2820 unsigned int time_squeeze;
2821 unsigned int received_rps;
2822 #ifdef CONFIG_RPS
2823 struct softnet_data *rps_ipi_list;
2824 #endif
2825 #ifdef CONFIG_NET_FLOW_LIMIT
2826 struct sd_flow_limit __rcu *flow_limit;
2827 #endif
2828 struct Qdisc *output_queue;
2829 struct Qdisc **output_queue_tailp;
2830 struct sk_buff *completion_queue;
2831
2832 #ifdef CONFIG_RPS
2833 /* input_queue_head should be written by cpu owning this struct,
2834 * and only read by other cpus. Worth using a cache line.
2835 */
2836 unsigned int input_queue_head ____cacheline_aligned_in_smp;
2837
2838 /* Elements below can be accessed between CPUs for RPS/RFS */
2839 call_single_data_t csd ____cacheline_aligned_in_smp;
2840 struct softnet_data *rps_ipi_next;
2841 unsigned int cpu;
2842 unsigned int input_queue_tail;
2843 #endif
2844 unsigned int dropped;
2845 struct sk_buff_head input_pkt_queue;
2846 struct napi_struct backlog;
2847
2848 };
2849
2850 static inline void input_queue_head_incr(struct softnet_data *sd)
2851 {
2852 #ifdef CONFIG_RPS
2853 sd->input_queue_head++;
2854 #endif
2855 }
2856
2857 static inline void input_queue_tail_incr_save(struct softnet_data *sd,
2858 unsigned int *qtail)
2859 {
2860 #ifdef CONFIG_RPS
2861 *qtail = ++sd->input_queue_tail;
2862 #endif
2863 }
2864
2865 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
2866
2867 void __netif_schedule(struct Qdisc *q);
2868 void netif_schedule_queue(struct netdev_queue *txq);
2869
2870 static inline void netif_tx_schedule_all(struct net_device *dev)
2871 {
2872 unsigned int i;
2873
2874 for (i = 0; i < dev->num_tx_queues; i++)
2875 netif_schedule_queue(netdev_get_tx_queue(dev, i));
2876 }
2877
2878 static __always_inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
2879 {
2880 clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2881 }
2882
2883 /**
2884 * netif_start_queue - allow transmit
2885 * @dev: network device
2886 *
2887 * Allow upper layers to call the device hard_start_xmit routine.
2888 */
2889 static inline void netif_start_queue(struct net_device *dev)
2890 {
2891 netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
2892 }
2893
2894 static inline void netif_tx_start_all_queues(struct net_device *dev)
2895 {
2896 unsigned int i;
2897
2898 for (i = 0; i < dev->num_tx_queues; i++) {
2899 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2900 netif_tx_start_queue(txq);
2901 }
2902 }
2903
2904 void netif_tx_wake_queue(struct netdev_queue *dev_queue);
2905
2906 /**
2907 * netif_wake_queue - restart transmit
2908 * @dev: network device
2909 *
2910 * Allow upper layers to call the device hard_start_xmit routine.
2911 * Used for flow control when transmit resources are available.
2912 */
2913 static inline void netif_wake_queue(struct net_device *dev)
2914 {
2915 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
2916 }
2917
2918 static inline void netif_tx_wake_all_queues(struct net_device *dev)
2919 {
2920 unsigned int i;
2921
2922 for (i = 0; i < dev->num_tx_queues; i++) {
2923 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2924 netif_tx_wake_queue(txq);
2925 }
2926 }
2927
2928 static __always_inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
2929 {
2930 set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2931 }
2932
2933 /**
2934 * netif_stop_queue - stop transmitted packets
2935 * @dev: network device
2936 *
2937 * Stop upper layers calling the device hard_start_xmit routine.
2938 * Used for flow control when transmit resources are unavailable.
2939 */
2940 static inline void netif_stop_queue(struct net_device *dev)
2941 {
2942 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
2943 }
2944
2945 void netif_tx_stop_all_queues(struct net_device *dev);
2946
2947 static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
2948 {
2949 return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2950 }
2951
2952 /**
2953 * netif_queue_stopped - test if transmit queue is flowblocked
2954 * @dev: network device
2955 *
2956 * Test if transmit queue on device is currently unable to send.
2957 */
2958 static inline bool netif_queue_stopped(const struct net_device *dev)
2959 {
2960 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
2961 }
2962
2963 static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
2964 {
2965 return dev_queue->state & QUEUE_STATE_ANY_XOFF;
2966 }
2967
2968 static inline bool
2969 netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
2970 {
2971 return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
2972 }
2973
2974 static inline bool
2975 netif_xmit_frozen_or_drv_stopped(const struct netdev_queue *dev_queue)
2976 {
2977 return dev_queue->state & QUEUE_STATE_DRV_XOFF_OR_FROZEN;
2978 }
2979
2980 /**
2981 * netdev_txq_bql_enqueue_prefetchw - prefetch bql data for write
2982 * @dev_queue: pointer to transmit queue
2983 *
2984 * BQL enabled drivers might use this helper in their ndo_start_xmit(),
2985 * to give appropriate hint to the CPU.
2986 */
2987 static inline void netdev_txq_bql_enqueue_prefetchw(struct netdev_queue *dev_queue)
2988 {
2989 #ifdef CONFIG_BQL
2990 prefetchw(&dev_queue->dql.num_queued);
2991 #endif
2992 }
2993
2994 /**
2995 * netdev_txq_bql_complete_prefetchw - prefetch bql data for write
2996 * @dev_queue: pointer to transmit queue
2997 *
2998 * BQL enabled drivers might use this helper in their TX completion path,
2999 * to give appropriate hint to the CPU.
3000 */
3001 static inline void netdev_txq_bql_complete_prefetchw(struct netdev_queue *dev_queue)
3002 {
3003 #ifdef CONFIG_BQL
3004 prefetchw(&dev_queue->dql.limit);
3005 #endif
3006 }
3007
3008 static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
3009 unsigned int bytes)
3010 {
3011 #ifdef CONFIG_BQL
3012 dql_queued(&dev_queue->dql, bytes);
3013
3014 if (likely(dql_avail(&dev_queue->dql) >= 0))
3015 return;
3016
3017 set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
3018
3019 /*
3020 * The XOFF flag must be set before checking the dql_avail below,
3021 * because in netdev_tx_completed_queue we update the dql_completed
3022 * before checking the XOFF flag.
3023 */
3024 smp_mb();
3025
3026 /* check again in case another CPU has just made room avail */
3027 if (unlikely(dql_avail(&dev_queue->dql) >= 0))
3028 clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
3029 #endif
3030 }
3031
3032 /**
3033 * netdev_sent_queue - report the number of bytes queued to hardware
3034 * @dev: network device
3035 * @bytes: number of bytes queued to the hardware device queue
3036 *
3037 * Report the number of bytes queued for sending/completion to the network
3038 * device hardware queue. @bytes should be a good approximation and should
3039 * exactly match netdev_completed_queue() @bytes
3040 */
3041 static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes)
3042 {
3043 netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes);
3044 }
3045
3046 static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue,
3047 unsigned int pkts, unsigned int bytes)
3048 {
3049 #ifdef CONFIG_BQL
3050 if (unlikely(!bytes))
3051 return;
3052
3053 dql_completed(&dev_queue->dql, bytes);
3054
3055 /*
3056 * Without the memory barrier there is a small possiblity that
3057 * netdev_tx_sent_queue will miss the update and cause the queue to
3058 * be stopped forever
3059 */
3060 smp_mb();
3061
3062 if (dql_avail(&dev_queue->dql) < 0)
3063 return;
3064
3065 if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state))
3066 netif_schedule_queue(dev_queue);
3067 #endif
3068 }
3069
3070 /**
3071 * netdev_completed_queue - report bytes and packets completed by device
3072 * @dev: network device
3073 * @pkts: actual number of packets sent over the medium
3074 * @bytes: actual number of bytes sent over the medium
3075 *
3076 * Report the number of bytes and packets transmitted by the network device
3077 * hardware queue over the physical medium, @bytes must exactly match the
3078 * @bytes amount passed to netdev_sent_queue()
3079 */
3080 static inline void netdev_completed_queue(struct net_device *dev,
3081 unsigned int pkts, unsigned int bytes)
3082 {
3083 netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes);
3084 }
3085
3086 static inline void netdev_tx_reset_queue(struct netdev_queue *q)
3087 {
3088 #ifdef CONFIG_BQL
3089 clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
3090 dql_reset(&q->dql);
3091 #endif
3092 }
3093
3094 /**
3095 * netdev_reset_queue - reset the packets and bytes count of a network device
3096 * @dev_queue: network device
3097 *
3098 * Reset the bytes and packet count of a network device and clear the
3099 * software flow control OFF bit for this network device
3100 */
3101 static inline void netdev_reset_queue(struct net_device *dev_queue)
3102 {
3103 netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
3104 }
3105
3106 /**
3107 * netdev_cap_txqueue - check if selected tx queue exceeds device queues
3108 * @dev: network device
3109 * @queue_index: given tx queue index
3110 *
3111 * Returns 0 if given tx queue index >= number of device tx queues,
3112 * otherwise returns the originally passed tx queue index.
3113 */
3114 static inline u16 netdev_cap_txqueue(struct net_device *dev, u16 queue_index)
3115 {
3116 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
3117 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
3118 dev->name, queue_index,
3119 dev->real_num_tx_queues);
3120 return 0;
3121 }
3122
3123 return queue_index;
3124 }
3125
3126 /**
3127 * netif_running - test if up
3128 * @dev: network device
3129 *
3130 * Test if the device has been brought up.
3131 */
3132 static inline bool netif_running(const struct net_device *dev)
3133 {
3134 return test_bit(__LINK_STATE_START, &dev->state);
3135 }
3136
3137 /*
3138 * Routines to manage the subqueues on a device. We only need start,
3139 * stop, and a check if it's stopped. All other device management is
3140 * done at the overall netdevice level.
3141 * Also test the device if we're multiqueue.
3142 */
3143
3144 /**
3145 * netif_start_subqueue - allow sending packets on subqueue
3146 * @dev: network device
3147 * @queue_index: sub queue index
3148 *
3149 * Start individual transmit queue of a device with multiple transmit queues.
3150 */
3151 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
3152 {
3153 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3154
3155 netif_tx_start_queue(txq);
3156 }
3157
3158 /**
3159 * netif_stop_subqueue - stop sending packets on subqueue
3160 * @dev: network device
3161 * @queue_index: sub queue index
3162 *
3163 * Stop individual transmit queue of a device with multiple transmit queues.
3164 */
3165 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
3166 {
3167 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3168 netif_tx_stop_queue(txq);
3169 }
3170
3171 /**
3172 * netif_subqueue_stopped - test status of subqueue
3173 * @dev: network device
3174 * @queue_index: sub queue index
3175 *
3176 * Check individual transmit queue of a device with multiple transmit queues.
3177 */
3178 static inline bool __netif_subqueue_stopped(const struct net_device *dev,
3179 u16 queue_index)
3180 {
3181 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3182
3183 return netif_tx_queue_stopped(txq);
3184 }
3185
3186 static inline bool netif_subqueue_stopped(const struct net_device *dev,
3187 struct sk_buff *skb)
3188 {
3189 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
3190 }
3191
3192 /**
3193 * netif_wake_subqueue - allow sending packets on subqueue
3194 * @dev: network device
3195 * @queue_index: sub queue index
3196 *
3197 * Resume individual transmit queue of a device with multiple transmit queues.
3198 */
3199 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
3200 {
3201 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3202
3203 netif_tx_wake_queue(txq);
3204 }
3205
3206 #ifdef CONFIG_XPS
3207 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
3208 u16 index);
3209 #else
3210 static inline int netif_set_xps_queue(struct net_device *dev,
3211 const struct cpumask *mask,
3212 u16 index)
3213 {
3214 return 0;
3215 }
3216 #endif
3217
3218 u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb,
3219 unsigned int num_tx_queues);
3220
3221 /*
3222 * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
3223 * as a distribution range limit for the returned value.
3224 */
3225 static inline u16 skb_tx_hash(const struct net_device *dev,
3226 struct sk_buff *skb)
3227 {
3228 return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
3229 }
3230
3231 /**
3232 * netif_is_multiqueue - test if device has multiple transmit queues
3233 * @dev: network device
3234 *
3235 * Check if device has multiple transmit queues
3236 */
3237 static inline bool netif_is_multiqueue(const struct net_device *dev)
3238 {
3239 return dev->num_tx_queues > 1;
3240 }
3241
3242 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq);
3243
3244 #ifdef CONFIG_SYSFS
3245 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq);
3246 #else
3247 static inline int netif_set_real_num_rx_queues(struct net_device *dev,
3248 unsigned int rxq)
3249 {
3250 return 0;
3251 }
3252 #endif
3253
3254 #ifdef CONFIG_SYSFS
3255 static inline unsigned int get_netdev_rx_queue_index(
3256 struct netdev_rx_queue *queue)
3257 {
3258 struct net_device *dev = queue->dev;
3259 int index = queue - dev->_rx;
3260
3261 BUG_ON(index >= dev->num_rx_queues);
3262 return index;
3263 }
3264 #endif
3265
3266 #define DEFAULT_MAX_NUM_RSS_QUEUES (8)
3267 int netif_get_num_default_rss_queues(void);
3268
3269 enum skb_free_reason {
3270 SKB_REASON_CONSUMED,
3271 SKB_REASON_DROPPED,
3272 };
3273
3274 void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason);
3275 void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason);
3276
3277 /*
3278 * It is not allowed to call kfree_skb() or consume_skb() from hardware
3279 * interrupt context or with hardware interrupts being disabled.
3280 * (in_irq() || irqs_disabled())
3281 *
3282 * We provide four helpers that can be used in following contexts :
3283 *
3284 * dev_kfree_skb_irq(skb) when caller drops a packet from irq context,
3285 * replacing kfree_skb(skb)
3286 *
3287 * dev_consume_skb_irq(skb) when caller consumes a packet from irq context.
3288 * Typically used in place of consume_skb(skb) in TX completion path
3289 *
3290 * dev_kfree_skb_any(skb) when caller doesn't know its current irq context,
3291 * replacing kfree_skb(skb)
3292 *
3293 * dev_consume_skb_any(skb) when caller doesn't know its current irq context,
3294 * and consumed a packet. Used in place of consume_skb(skb)
3295 */
3296 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
3297 {
3298 __dev_kfree_skb_irq(skb, SKB_REASON_DROPPED);
3299 }
3300
3301 static inline void dev_consume_skb_irq(struct sk_buff *skb)
3302 {
3303 __dev_kfree_skb_irq(skb, SKB_REASON_CONSUMED);
3304 }
3305
3306 static inline void dev_kfree_skb_any(struct sk_buff *skb)
3307 {
3308 __dev_kfree_skb_any(skb, SKB_REASON_DROPPED);
3309 }
3310
3311 static inline void dev_consume_skb_any(struct sk_buff *skb)
3312 {
3313 __dev_kfree_skb_any(skb, SKB_REASON_CONSUMED);
3314 }
3315
3316 void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog);
3317 int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb);
3318 int netif_rx(struct sk_buff *skb);
3319 int netif_rx_ni(struct sk_buff *skb);
3320 int netif_receive_skb(struct sk_buff *skb);
3321 int netif_receive_skb_core(struct sk_buff *skb);
3322 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb);
3323 void napi_gro_flush(struct napi_struct *napi, bool flush_old);
3324 struct sk_buff *napi_get_frags(struct napi_struct *napi);
3325 gro_result_t napi_gro_frags(struct napi_struct *napi);
3326 struct packet_offload *gro_find_receive_by_type(__be16 type);
3327 struct packet_offload *gro_find_complete_by_type(__be16 type);
3328
3329 static inline void napi_free_frags(struct napi_struct *napi)
3330 {
3331 kfree_skb(napi->skb);
3332 napi->skb = NULL;
3333 }
3334
3335 bool netdev_is_rx_handler_busy(struct net_device *dev);
3336 int netdev_rx_handler_register(struct net_device *dev,
3337 rx_handler_func_t *rx_handler,
3338 void *rx_handler_data);
3339 void netdev_rx_handler_unregister(struct net_device *dev);
3340
3341 bool dev_valid_name(const char *name);
3342 int dev_ioctl(struct net *net, unsigned int cmd, void __user *);
3343 int dev_ethtool(struct net *net, struct ifreq *);
3344 unsigned int dev_get_flags(const struct net_device *);
3345 int __dev_change_flags(struct net_device *, unsigned int flags);
3346 int dev_change_flags(struct net_device *, unsigned int);
3347 void __dev_notify_flags(struct net_device *, unsigned int old_flags,
3348 unsigned int gchanges);
3349 int dev_change_name(struct net_device *, const char *);
3350 int dev_set_alias(struct net_device *, const char *, size_t);
3351 int dev_get_alias(const struct net_device *, char *, size_t);
3352 int dev_change_net_namespace(struct net_device *, struct net *, const char *);
3353 int __dev_set_mtu(struct net_device *, int);
3354 int dev_set_mtu(struct net_device *, int);
3355 void dev_set_group(struct net_device *, int);
3356 int dev_set_mac_address(struct net_device *, struct sockaddr *);
3357 int dev_change_carrier(struct net_device *, bool new_carrier);
3358 int dev_get_phys_port_id(struct net_device *dev,
3359 struct netdev_phys_item_id *ppid);
3360 int dev_get_phys_port_name(struct net_device *dev,
3361 char *name, size_t len);
3362 int dev_change_proto_down(struct net_device *dev, bool proto_down);
3363 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev);
3364 struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
3365 struct netdev_queue *txq, int *ret);
3366
3367 typedef int (*bpf_op_t)(struct net_device *dev, struct netdev_bpf *bpf);
3368 int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
3369 int fd, u32 flags);
3370 u8 __dev_xdp_attached(struct net_device *dev, bpf_op_t xdp_op, u32 *prog_id);
3371
3372 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
3373 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
3374 bool is_skb_forwardable(const struct net_device *dev,
3375 const struct sk_buff *skb);
3376
3377 static __always_inline int ____dev_forward_skb(struct net_device *dev,
3378 struct sk_buff *skb)
3379 {
3380 if (skb_orphan_frags(skb, GFP_ATOMIC) ||
3381 unlikely(!is_skb_forwardable(dev, skb))) {
3382 atomic_long_inc(&dev->rx_dropped);
3383 kfree_skb(skb);
3384 return NET_RX_DROP;
3385 }
3386
3387 skb_scrub_packet(skb, true);
3388 skb->priority = 0;
3389 return 0;
3390 }
3391
3392 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
3393
3394 extern int netdev_budget;
3395 extern unsigned int netdev_budget_usecs;
3396
3397 /* Called by rtnetlink.c:rtnl_unlock() */
3398 void netdev_run_todo(void);
3399
3400 /**
3401 * dev_put - release reference to device
3402 * @dev: network device
3403 *
3404 * Release reference to device to allow it to be freed.
3405 */
3406 static inline void dev_put(struct net_device *dev)
3407 {
3408 this_cpu_dec(*dev->pcpu_refcnt);
3409 }
3410
3411 /**
3412 * dev_hold - get reference to device
3413 * @dev: network device
3414 *
3415 * Hold reference to device to keep it from being freed.
3416 */
3417 static inline void dev_hold(struct net_device *dev)
3418 {
3419 this_cpu_inc(*dev->pcpu_refcnt);
3420 }
3421
3422 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
3423 * and _off may be called from IRQ context, but it is caller
3424 * who is responsible for serialization of these calls.
3425 *
3426 * The name carrier is inappropriate, these functions should really be
3427 * called netif_lowerlayer_*() because they represent the state of any
3428 * kind of lower layer not just hardware media.
3429 */
3430
3431 void linkwatch_init_dev(struct net_device *dev);
3432 void linkwatch_fire_event(struct net_device *dev);
3433 void linkwatch_forget_dev(struct net_device *dev);
3434
3435 /**
3436 * netif_carrier_ok - test if carrier present
3437 * @dev: network device
3438 *
3439 * Check if carrier is present on device
3440 */
3441 static inline bool netif_carrier_ok(const struct net_device *dev)
3442 {
3443 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
3444 }
3445
3446 unsigned long dev_trans_start(struct net_device *dev);
3447
3448 void __netdev_watchdog_up(struct net_device *dev);
3449
3450 void netif_carrier_on(struct net_device *dev);
3451
3452 void netif_carrier_off(struct net_device *dev);
3453
3454 /**
3455 * netif_dormant_on - mark device as dormant.
3456 * @dev: network device
3457 *
3458 * Mark device as dormant (as per RFC2863).
3459 *
3460 * The dormant state indicates that the relevant interface is not
3461 * actually in a condition to pass packets (i.e., it is not 'up') but is
3462 * in a "pending" state, waiting for some external event. For "on-
3463 * demand" interfaces, this new state identifies the situation where the
3464 * interface is waiting for events to place it in the up state.
3465 */
3466 static inline void netif_dormant_on(struct net_device *dev)
3467 {
3468 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
3469 linkwatch_fire_event(dev);
3470 }
3471
3472 /**
3473 * netif_dormant_off - set device as not dormant.
3474 * @dev: network device
3475 *
3476 * Device is not in dormant state.
3477 */
3478 static inline void netif_dormant_off(struct net_device *dev)
3479 {
3480 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
3481 linkwatch_fire_event(dev);
3482 }
3483
3484 /**
3485 * netif_dormant - test if device is dormant
3486 * @dev: network device
3487 *
3488 * Check if device is dormant.
3489 */
3490 static inline bool netif_dormant(const struct net_device *dev)
3491 {
3492 return test_bit(__LINK_STATE_DORMANT, &dev->state);
3493 }
3494
3495
3496 /**
3497 * netif_oper_up - test if device is operational
3498 * @dev: network device
3499 *
3500 * Check if carrier is operational
3501 */
3502 static inline bool netif_oper_up(const struct net_device *dev)
3503 {
3504 return (dev->operstate == IF_OPER_UP ||
3505 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
3506 }
3507
3508 /**
3509 * netif_device_present - is device available or removed
3510 * @dev: network device
3511 *
3512 * Check if device has not been removed from system.
3513 */
3514 static inline bool netif_device_present(struct net_device *dev)
3515 {
3516 return test_bit(__LINK_STATE_PRESENT, &dev->state);
3517 }
3518
3519 void netif_device_detach(struct net_device *dev);
3520
3521 void netif_device_attach(struct net_device *dev);
3522
3523 /*
3524 * Network interface message level settings
3525 */
3526
3527 enum {
3528 NETIF_MSG_DRV = 0x0001,
3529 NETIF_MSG_PROBE = 0x0002,
3530 NETIF_MSG_LINK = 0x0004,
3531 NETIF_MSG_TIMER = 0x0008,
3532 NETIF_MSG_IFDOWN = 0x0010,
3533 NETIF_MSG_IFUP = 0x0020,
3534 NETIF_MSG_RX_ERR = 0x0040,
3535 NETIF_MSG_TX_ERR = 0x0080,
3536 NETIF_MSG_TX_QUEUED = 0x0100,
3537 NETIF_MSG_INTR = 0x0200,
3538 NETIF_MSG_TX_DONE = 0x0400,
3539 NETIF_MSG_RX_STATUS = 0x0800,
3540 NETIF_MSG_PKTDATA = 0x1000,
3541 NETIF_MSG_HW = 0x2000,
3542 NETIF_MSG_WOL = 0x4000,
3543 };
3544
3545 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
3546 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
3547 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
3548 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
3549 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
3550 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
3551 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
3552 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
3553 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
3554 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
3555 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
3556 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
3557 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
3558 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
3559 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
3560
3561 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
3562 {
3563 /* use default */
3564 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
3565 return default_msg_enable_bits;
3566 if (debug_value == 0) /* no output */
3567 return 0;
3568 /* set low N bits */
3569 return (1U << debug_value) - 1;
3570 }
3571
3572 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
3573 {
3574 spin_lock(&txq->_xmit_lock);
3575 txq->xmit_lock_owner = cpu;
3576 }
3577
3578 static inline bool __netif_tx_acquire(struct netdev_queue *txq)
3579 {
3580 __acquire(&txq->_xmit_lock);
3581 return true;
3582 }
3583
3584 static inline void __netif_tx_release(struct netdev_queue *txq)
3585 {
3586 __release(&txq->_xmit_lock);
3587 }
3588
3589 static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
3590 {
3591 spin_lock_bh(&txq->_xmit_lock);
3592 txq->xmit_lock_owner = smp_processor_id();
3593 }
3594
3595 static inline bool __netif_tx_trylock(struct netdev_queue *txq)
3596 {
3597 bool ok = spin_trylock(&txq->_xmit_lock);
3598 if (likely(ok))
3599 txq->xmit_lock_owner = smp_processor_id();
3600 return ok;
3601 }
3602
3603 static inline void __netif_tx_unlock(struct netdev_queue *txq)
3604 {
3605 txq->xmit_lock_owner = -1;
3606 spin_unlock(&txq->_xmit_lock);
3607 }
3608
3609 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
3610 {
3611 txq->xmit_lock_owner = -1;
3612 spin_unlock_bh(&txq->_xmit_lock);
3613 }
3614
3615 static inline void txq_trans_update(struct netdev_queue *txq)
3616 {
3617 if (txq->xmit_lock_owner != -1)
3618 txq->trans_start = jiffies;
3619 }
3620
3621 /* legacy drivers only, netdev_start_xmit() sets txq->trans_start */
3622 static inline void netif_trans_update(struct net_device *dev)
3623 {
3624 struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
3625
3626 if (txq->trans_start != jiffies)
3627 txq->trans_start = jiffies;
3628 }
3629
3630 /**
3631 * netif_tx_lock - grab network device transmit lock
3632 * @dev: network device
3633 *
3634 * Get network device transmit lock
3635 */
3636 static inline void netif_tx_lock(struct net_device *dev)
3637 {
3638 unsigned int i;
3639 int cpu;
3640
3641 spin_lock(&dev->tx_global_lock);
3642 cpu = smp_processor_id();
3643 for (i = 0; i < dev->num_tx_queues; i++) {
3644 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3645
3646 /* We are the only thread of execution doing a
3647 * freeze, but we have to grab the _xmit_lock in
3648 * order to synchronize with threads which are in
3649 * the ->hard_start_xmit() handler and already
3650 * checked the frozen bit.
3651 */
3652 __netif_tx_lock(txq, cpu);
3653 set_bit(__QUEUE_STATE_FROZEN, &txq->state);
3654 __netif_tx_unlock(txq);
3655 }
3656 }
3657
3658 static inline void netif_tx_lock_bh(struct net_device *dev)
3659 {
3660 local_bh_disable();
3661 netif_tx_lock(dev);
3662 }
3663
3664 static inline void netif_tx_unlock(struct net_device *dev)
3665 {
3666 unsigned int i;
3667
3668 for (i = 0; i < dev->num_tx_queues; i++) {
3669 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3670
3671 /* No need to grab the _xmit_lock here. If the
3672 * queue is not stopped for another reason, we
3673 * force a schedule.
3674 */
3675 clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
3676 netif_schedule_queue(txq);
3677 }
3678 spin_unlock(&dev->tx_global_lock);
3679 }
3680
3681 static inline void netif_tx_unlock_bh(struct net_device *dev)
3682 {
3683 netif_tx_unlock(dev);
3684 local_bh_enable();
3685 }
3686
3687 #define HARD_TX_LOCK(dev, txq, cpu) { \
3688 if ((dev->features & NETIF_F_LLTX) == 0) { \
3689 __netif_tx_lock(txq, cpu); \
3690 } else { \
3691 __netif_tx_acquire(txq); \
3692 } \
3693 }
3694
3695 #define HARD_TX_TRYLOCK(dev, txq) \
3696 (((dev->features & NETIF_F_LLTX) == 0) ? \
3697 __netif_tx_trylock(txq) : \
3698 __netif_tx_acquire(txq))
3699
3700 #define HARD_TX_UNLOCK(dev, txq) { \
3701 if ((dev->features & NETIF_F_LLTX) == 0) { \
3702 __netif_tx_unlock(txq); \
3703 } else { \
3704 __netif_tx_release(txq); \
3705 } \
3706 }
3707
3708 static inline void netif_tx_disable(struct net_device *dev)
3709 {
3710 unsigned int i;
3711 int cpu;
3712
3713 local_bh_disable();
3714 cpu = smp_processor_id();
3715 for (i = 0; i < dev->num_tx_queues; i++) {
3716 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3717
3718 __netif_tx_lock(txq, cpu);
3719 netif_tx_stop_queue(txq);
3720 __netif_tx_unlock(txq);
3721 }
3722 local_bh_enable();
3723 }
3724
3725 static inline void netif_addr_lock(struct net_device *dev)
3726 {
3727 spin_lock(&dev->addr_list_lock);
3728 }
3729
3730 static inline void netif_addr_lock_nested(struct net_device *dev)
3731 {
3732 int subclass = SINGLE_DEPTH_NESTING;
3733
3734 if (dev->netdev_ops->ndo_get_lock_subclass)
3735 subclass = dev->netdev_ops->ndo_get_lock_subclass(dev);
3736
3737 spin_lock_nested(&dev->addr_list_lock, subclass);
3738 }
3739
3740 static inline void netif_addr_lock_bh(struct net_device *dev)
3741 {
3742 spin_lock_bh(&dev->addr_list_lock);
3743 }
3744
3745 static inline void netif_addr_unlock(struct net_device *dev)
3746 {
3747 spin_unlock(&dev->addr_list_lock);
3748 }
3749
3750 static inline void netif_addr_unlock_bh(struct net_device *dev)
3751 {
3752 spin_unlock_bh(&dev->addr_list_lock);
3753 }
3754
3755 /*
3756 * dev_addrs walker. Should be used only for read access. Call with
3757 * rcu_read_lock held.
3758 */
3759 #define for_each_dev_addr(dev, ha) \
3760 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
3761
3762 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
3763
3764 void ether_setup(struct net_device *dev);
3765
3766 /* Support for loadable net-drivers */
3767 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
3768 unsigned char name_assign_type,
3769 void (*setup)(struct net_device *),
3770 unsigned int txqs, unsigned int rxqs);
3771 int dev_get_valid_name(struct net *net, struct net_device *dev,
3772 const char *name);
3773
3774 #define alloc_netdev(sizeof_priv, name, name_assign_type, setup) \
3775 alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, 1, 1)
3776
3777 #define alloc_netdev_mq(sizeof_priv, name, name_assign_type, setup, count) \
3778 alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, count, \
3779 count)
3780
3781 int register_netdev(struct net_device *dev);
3782 void unregister_netdev(struct net_device *dev);
3783
3784 /* General hardware address lists handling functions */
3785 int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
3786 struct netdev_hw_addr_list *from_list, int addr_len);
3787 void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
3788 struct netdev_hw_addr_list *from_list, int addr_len);
3789 int __hw_addr_sync_dev(struct netdev_hw_addr_list *list,
3790 struct net_device *dev,
3791 int (*sync)(struct net_device *, const unsigned char *),
3792 int (*unsync)(struct net_device *,
3793 const unsigned char *));
3794 void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list,
3795 struct net_device *dev,
3796 int (*unsync)(struct net_device *,
3797 const unsigned char *));
3798 void __hw_addr_init(struct netdev_hw_addr_list *list);
3799
3800 /* Functions used for device addresses handling */
3801 int dev_addr_add(struct net_device *dev, const unsigned char *addr,
3802 unsigned char addr_type);
3803 int dev_addr_del(struct net_device *dev, const unsigned char *addr,
3804 unsigned char addr_type);
3805 void dev_addr_flush(struct net_device *dev);
3806 int dev_addr_init(struct net_device *dev);
3807
3808 /* Functions used for unicast addresses handling */
3809 int dev_uc_add(struct net_device *dev, const unsigned char *addr);
3810 int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr);
3811 int dev_uc_del(struct net_device *dev, const unsigned char *addr);
3812 int dev_uc_sync(struct net_device *to, struct net_device *from);
3813 int dev_uc_sync_multiple(struct net_device *to, struct net_device *from);
3814 void dev_uc_unsync(struct net_device *to, struct net_device *from);
3815 void dev_uc_flush(struct net_device *dev);
3816 void dev_uc_init(struct net_device *dev);
3817
3818 /**
3819 * __dev_uc_sync - Synchonize device's unicast list
3820 * @dev: device to sync
3821 * @sync: function to call if address should be added
3822 * @unsync: function to call if address should be removed
3823 *
3824 * Add newly added addresses to the interface, and release
3825 * addresses that have been deleted.
3826 */
3827 static inline int __dev_uc_sync(struct net_device *dev,
3828 int (*sync)(struct net_device *,
3829 const unsigned char *),
3830 int (*unsync)(struct net_device *,
3831 const unsigned char *))
3832 {
3833 return __hw_addr_sync_dev(&dev->uc, dev, sync, unsync);
3834 }
3835
3836 /**
3837 * __dev_uc_unsync - Remove synchronized addresses from device
3838 * @dev: device to sync
3839 * @unsync: function to call if address should be removed
3840 *
3841 * Remove all addresses that were added to the device by dev_uc_sync().
3842 */
3843 static inline void __dev_uc_unsync(struct net_device *dev,
3844 int (*unsync)(struct net_device *,
3845 const unsigned char *))
3846 {
3847 __hw_addr_unsync_dev(&dev->uc, dev, unsync);
3848 }
3849
3850 /* Functions used for multicast addresses handling */
3851 int dev_mc_add(struct net_device *dev, const unsigned char *addr);
3852 int dev_mc_add_global(struct net_device *dev, const unsigned char *addr);
3853 int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr);
3854 int dev_mc_del(struct net_device *dev, const unsigned char *addr);
3855 int dev_mc_del_global(struct net_device *dev, const unsigned char *addr);
3856 int dev_mc_sync(struct net_device *to, struct net_device *from);
3857 int dev_mc_sync_multiple(struct net_device *to, struct net_device *from);
3858 void dev_mc_unsync(struct net_device *to, struct net_device *from);
3859 void dev_mc_flush(struct net_device *dev);
3860 void dev_mc_init(struct net_device *dev);
3861
3862 /**
3863 * __dev_mc_sync - Synchonize device's multicast list
3864 * @dev: device to sync
3865 * @sync: function to call if address should be added
3866 * @unsync: function to call if address should be removed
3867 *
3868 * Add newly added addresses to the interface, and release
3869 * addresses that have been deleted.
3870 */
3871 static inline int __dev_mc_sync(struct net_device *dev,
3872 int (*sync)(struct net_device *,
3873 const unsigned char *),
3874 int (*unsync)(struct net_device *,
3875 const unsigned char *))
3876 {
3877 return __hw_addr_sync_dev(&dev->mc, dev, sync, unsync);
3878 }
3879
3880 /**
3881 * __dev_mc_unsync - Remove synchronized addresses from device
3882 * @dev: device to sync
3883 * @unsync: function to call if address should be removed
3884 *
3885 * Remove all addresses that were added to the device by dev_mc_sync().
3886 */
3887 static inline void __dev_mc_unsync(struct net_device *dev,
3888 int (*unsync)(struct net_device *,
3889 const unsigned char *))
3890 {
3891 __hw_addr_unsync_dev(&dev->mc, dev, unsync);
3892 }
3893
3894 /* Functions used for secondary unicast and multicast support */
3895 void dev_set_rx_mode(struct net_device *dev);
3896 void __dev_set_rx_mode(struct net_device *dev);
3897 int dev_set_promiscuity(struct net_device *dev, int inc);
3898 int dev_set_allmulti(struct net_device *dev, int inc);
3899 void netdev_state_change(struct net_device *dev);
3900 void netdev_notify_peers(struct net_device *dev);
3901 void netdev_features_change(struct net_device *dev);
3902 /* Load a device via the kmod */
3903 void dev_load(struct net *net, const char *name);
3904 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
3905 struct rtnl_link_stats64 *storage);
3906 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
3907 const struct net_device_stats *netdev_stats);
3908
3909 extern int netdev_max_backlog;
3910 extern int netdev_tstamp_prequeue;
3911 extern int weight_p;
3912 extern int dev_weight_rx_bias;
3913 extern int dev_weight_tx_bias;
3914 extern int dev_rx_weight;
3915 extern int dev_tx_weight;
3916
3917 bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev);
3918 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
3919 struct list_head **iter);
3920 struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
3921 struct list_head **iter);
3922
3923 /* iterate through upper list, must be called under RCU read lock */
3924 #define netdev_for_each_upper_dev_rcu(dev, updev, iter) \
3925 for (iter = &(dev)->adj_list.upper, \
3926 updev = netdev_upper_get_next_dev_rcu(dev, &(iter)); \
3927 updev; \
3928 updev = netdev_upper_get_next_dev_rcu(dev, &(iter)))
3929
3930 int netdev_walk_all_upper_dev_rcu(struct net_device *dev,
3931 int (*fn)(struct net_device *upper_dev,
3932 void *data),
3933 void *data);
3934
3935 bool netdev_has_upper_dev_all_rcu(struct net_device *dev,
3936 struct net_device *upper_dev);
3937
3938 bool netdev_has_any_upper_dev(struct net_device *dev);
3939
3940 void *netdev_lower_get_next_private(struct net_device *dev,
3941 struct list_head **iter);
3942 void *netdev_lower_get_next_private_rcu(struct net_device *dev,
3943 struct list_head **iter);
3944
3945 #define netdev_for_each_lower_private(dev, priv, iter) \
3946 for (iter = (dev)->adj_list.lower.next, \
3947 priv = netdev_lower_get_next_private(dev, &(iter)); \
3948 priv; \
3949 priv = netdev_lower_get_next_private(dev, &(iter)))
3950
3951 #define netdev_for_each_lower_private_rcu(dev, priv, iter) \
3952 for (iter = &(dev)->adj_list.lower, \
3953 priv = netdev_lower_get_next_private_rcu(dev, &(iter)); \
3954 priv; \
3955 priv = netdev_lower_get_next_private_rcu(dev, &(iter)))
3956
3957 void *netdev_lower_get_next(struct net_device *dev,
3958 struct list_head **iter);
3959
3960 #define netdev_for_each_lower_dev(dev, ldev, iter) \
3961 for (iter = (dev)->adj_list.lower.next, \
3962 ldev = netdev_lower_get_next(dev, &(iter)); \
3963 ldev; \
3964 ldev = netdev_lower_get_next(dev, &(iter)))
3965
3966 struct net_device *netdev_all_lower_get_next(struct net_device *dev,
3967 struct list_head **iter);
3968 struct net_device *netdev_all_lower_get_next_rcu(struct net_device *dev,
3969 struct list_head **iter);
3970
3971 int netdev_walk_all_lower_dev(struct net_device *dev,
3972 int (*fn)(struct net_device *lower_dev,
3973 void *data),
3974 void *data);
3975 int netdev_walk_all_lower_dev_rcu(struct net_device *dev,
3976 int (*fn)(struct net_device *lower_dev,
3977 void *data),
3978 void *data);
3979
3980 void *netdev_adjacent_get_private(struct list_head *adj_list);
3981 void *netdev_lower_get_first_private_rcu(struct net_device *dev);
3982 struct net_device *netdev_master_upper_dev_get(struct net_device *dev);
3983 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev);
3984 int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev,
3985 struct netlink_ext_ack *extack);
3986 int netdev_master_upper_dev_link(struct net_device *dev,
3987 struct net_device *upper_dev,
3988 void *upper_priv, void *upper_info,
3989 struct netlink_ext_ack *extack);
3990 void netdev_upper_dev_unlink(struct net_device *dev,
3991 struct net_device *upper_dev);
3992 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
3993 void *netdev_lower_dev_get_private(struct net_device *dev,
3994 struct net_device *lower_dev);
3995 void netdev_lower_state_changed(struct net_device *lower_dev,
3996 void *lower_state_info);
3997
3998 /* RSS keys are 40 or 52 bytes long */
3999 #define NETDEV_RSS_KEY_LEN 52
4000 extern u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly;
4001 void netdev_rss_key_fill(void *buffer, size_t len);
4002
4003 int dev_get_nest_level(struct net_device *dev);
4004 int skb_checksum_help(struct sk_buff *skb);
4005 int skb_crc32c_csum_help(struct sk_buff *skb);
4006 int skb_csum_hwoffload_help(struct sk_buff *skb,
4007 const netdev_features_t features);
4008
4009 struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
4010 netdev_features_t features, bool tx_path);
4011 struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
4012 netdev_features_t features);
4013
4014 struct netdev_bonding_info {
4015 ifslave slave;
4016 ifbond master;
4017 };
4018
4019 struct netdev_notifier_bonding_info {
4020 struct netdev_notifier_info info; /* must be first */
4021 struct netdev_bonding_info bonding_info;
4022 };
4023
4024 void netdev_bonding_info_change(struct net_device *dev,
4025 struct netdev_bonding_info *bonding_info);
4026
4027 static inline
4028 struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
4029 {
4030 return __skb_gso_segment(skb, features, true);
4031 }
4032 __be16 skb_network_protocol(struct sk_buff *skb, int *depth);
4033
4034 static inline bool can_checksum_protocol(netdev_features_t features,
4035 __be16 protocol)
4036 {
4037 if (protocol == htons(ETH_P_FCOE))
4038 return !!(features & NETIF_F_FCOE_CRC);
4039
4040 /* Assume this is an IP checksum (not SCTP CRC) */
4041
4042 if (features & NETIF_F_HW_CSUM) {
4043 /* Can checksum everything */
4044 return true;
4045 }
4046
4047 switch (protocol) {
4048 case htons(ETH_P_IP):
4049 return !!(features & NETIF_F_IP_CSUM);
4050 case htons(ETH_P_IPV6):
4051 return !!(features & NETIF_F_IPV6_CSUM);
4052 default:
4053 return false;
4054 }
4055 }
4056
4057 #ifdef CONFIG_BUG
4058 void netdev_rx_csum_fault(struct net_device *dev);
4059 #else
4060 static inline void netdev_rx_csum_fault(struct net_device *dev)
4061 {
4062 }
4063 #endif
4064 /* rx skb timestamps */
4065 void net_enable_timestamp(void);
4066 void net_disable_timestamp(void);
4067
4068 #ifdef CONFIG_PROC_FS
4069 int __init dev_proc_init(void);
4070 #else
4071 #define dev_proc_init() 0
4072 #endif
4073
4074 static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
4075 struct sk_buff *skb, struct net_device *dev,
4076 bool more)
4077 {
4078 skb->xmit_more = more ? 1 : 0;
4079 return ops->ndo_start_xmit(skb, dev);
4080 }
4081
4082 static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev,
4083 struct netdev_queue *txq, bool more)
4084 {
4085 const struct net_device_ops *ops = dev->netdev_ops;
4086 int rc;
4087
4088 rc = __netdev_start_xmit(ops, skb, dev, more);
4089 if (rc == NETDEV_TX_OK)
4090 txq_trans_update(txq);
4091
4092 return rc;
4093 }
4094
4095 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
4096 const void *ns);
4097 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
4098 const void *ns);
4099
4100 static inline int netdev_class_create_file(const struct class_attribute *class_attr)
4101 {
4102 return netdev_class_create_file_ns(class_attr, NULL);
4103 }
4104
4105 static inline void netdev_class_remove_file(const struct class_attribute *class_attr)
4106 {
4107 netdev_class_remove_file_ns(class_attr, NULL);
4108 }
4109
4110 extern const struct kobj_ns_type_operations net_ns_type_operations;
4111
4112 const char *netdev_drivername(const struct net_device *dev);
4113
4114 void linkwatch_run_queue(void);
4115
4116 static inline netdev_features_t netdev_intersect_features(netdev_features_t f1,
4117 netdev_features_t f2)
4118 {
4119 if ((f1 ^ f2) & NETIF_F_HW_CSUM) {
4120 if (f1 & NETIF_F_HW_CSUM)
4121 f1 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4122 else
4123 f2 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4124 }
4125
4126 return f1 & f2;
4127 }
4128
4129 static inline netdev_features_t netdev_get_wanted_features(
4130 struct net_device *dev)
4131 {
4132 return (dev->features & ~dev->hw_features) | dev->wanted_features;
4133 }
4134 netdev_features_t netdev_increment_features(netdev_features_t all,
4135 netdev_features_t one, netdev_features_t mask);
4136
4137 /* Allow TSO being used on stacked device :
4138 * Performing the GSO segmentation before last device
4139 * is a performance improvement.
4140 */
4141 static inline netdev_features_t netdev_add_tso_features(netdev_features_t features,
4142 netdev_features_t mask)
4143 {
4144 return netdev_increment_features(features, NETIF_F_ALL_TSO, mask);
4145 }
4146
4147 int __netdev_update_features(struct net_device *dev);
4148 void netdev_update_features(struct net_device *dev);
4149 void netdev_change_features(struct net_device *dev);
4150
4151 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4152 struct net_device *dev);
4153
4154 netdev_features_t passthru_features_check(struct sk_buff *skb,
4155 struct net_device *dev,
4156 netdev_features_t features);
4157 netdev_features_t netif_skb_features(struct sk_buff *skb);
4158
4159 static inline bool net_gso_ok(netdev_features_t features, int gso_type)
4160 {
4161 netdev_features_t feature = (netdev_features_t)gso_type << NETIF_F_GSO_SHIFT;
4162
4163 /* check flags correspondence */
4164 BUILD_BUG_ON(SKB_GSO_TCPV4 != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
4165 BUILD_BUG_ON(SKB_GSO_DODGY != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
4166 BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
4167 BUILD_BUG_ON(SKB_GSO_TCP_FIXEDID != (NETIF_F_TSO_MANGLEID >> NETIF_F_GSO_SHIFT));
4168 BUILD_BUG_ON(SKB_GSO_TCPV6 != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
4169 BUILD_BUG_ON(SKB_GSO_FCOE != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));
4170 BUILD_BUG_ON(SKB_GSO_GRE != (NETIF_F_GSO_GRE >> NETIF_F_GSO_SHIFT));
4171 BUILD_BUG_ON(SKB_GSO_GRE_CSUM != (NETIF_F_GSO_GRE_CSUM >> NETIF_F_GSO_SHIFT));
4172 BUILD_BUG_ON(SKB_GSO_IPXIP4 != (NETIF_F_GSO_IPXIP4 >> NETIF_F_GSO_SHIFT));
4173 BUILD_BUG_ON(SKB_GSO_IPXIP6 != (NETIF_F_GSO_IPXIP6 >> NETIF_F_GSO_SHIFT));
4174 BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL != (NETIF_F_GSO_UDP_TUNNEL >> NETIF_F_GSO_SHIFT));
4175 BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL_CSUM != (NETIF_F_GSO_UDP_TUNNEL_CSUM >> NETIF_F_GSO_SHIFT));
4176 BUILD_BUG_ON(SKB_GSO_PARTIAL != (NETIF_F_GSO_PARTIAL >> NETIF_F_GSO_SHIFT));
4177 BUILD_BUG_ON(SKB_GSO_TUNNEL_REMCSUM != (NETIF_F_GSO_TUNNEL_REMCSUM >> NETIF_F_GSO_SHIFT));
4178 BUILD_BUG_ON(SKB_GSO_SCTP != (NETIF_F_GSO_SCTP >> NETIF_F_GSO_SHIFT));
4179 BUILD_BUG_ON(SKB_GSO_ESP != (NETIF_F_GSO_ESP >> NETIF_F_GSO_SHIFT));
4180 BUILD_BUG_ON(SKB_GSO_UDP != (NETIF_F_GSO_UDP >> NETIF_F_GSO_SHIFT));
4181
4182 return (features & feature) == feature;
4183 }
4184
4185 static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
4186 {
4187 return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
4188 (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
4189 }
4190
4191 static inline bool netif_needs_gso(struct sk_buff *skb,
4192 netdev_features_t features)
4193 {
4194 return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
4195 unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
4196 (skb->ip_summed != CHECKSUM_UNNECESSARY)));
4197 }
4198
4199 static inline void netif_set_gso_max_size(struct net_device *dev,
4200 unsigned int size)
4201 {
4202 dev->gso_max_size = size;
4203 }
4204
4205 static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol,
4206 int pulled_hlen, u16 mac_offset,
4207 int mac_len)
4208 {
4209 skb->protocol = protocol;
4210 skb->encapsulation = 1;
4211 skb_push(skb, pulled_hlen);
4212 skb_reset_transport_header(skb);
4213 skb->mac_header = mac_offset;
4214 skb->network_header = skb->mac_header + mac_len;
4215 skb->mac_len = mac_len;
4216 }
4217
4218 static inline bool netif_is_macsec(const struct net_device *dev)
4219 {
4220 return dev->priv_flags & IFF_MACSEC;
4221 }
4222
4223 static inline bool netif_is_macvlan(const struct net_device *dev)
4224 {
4225 return dev->priv_flags & IFF_MACVLAN;
4226 }
4227
4228 static inline bool netif_is_macvlan_port(const struct net_device *dev)
4229 {
4230 return dev->priv_flags & IFF_MACVLAN_PORT;
4231 }
4232
4233 static inline bool netif_is_ipvlan(const struct net_device *dev)
4234 {
4235 return dev->priv_flags & IFF_IPVLAN_SLAVE;
4236 }
4237
4238 static inline bool netif_is_ipvlan_port(const struct net_device *dev)
4239 {
4240 return dev->priv_flags & IFF_IPVLAN_MASTER;
4241 }
4242
4243 static inline bool netif_is_bond_master(const struct net_device *dev)
4244 {
4245 return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING;
4246 }
4247
4248 static inline bool netif_is_bond_slave(const struct net_device *dev)
4249 {
4250 return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
4251 }
4252
4253 static inline bool netif_supports_nofcs(struct net_device *dev)
4254 {
4255 return dev->priv_flags & IFF_SUPP_NOFCS;
4256 }
4257
4258 static inline bool netif_has_l3_rx_handler(const struct net_device *dev)
4259 {
4260 return dev->priv_flags & IFF_L3MDEV_RX_HANDLER;
4261 }
4262
4263 static inline bool netif_is_l3_master(const struct net_device *dev)
4264 {
4265 return dev->priv_flags & IFF_L3MDEV_MASTER;
4266 }
4267
4268 static inline bool netif_is_l3_slave(const struct net_device *dev)
4269 {
4270 return dev->priv_flags & IFF_L3MDEV_SLAVE;
4271 }
4272
4273 static inline bool netif_is_bridge_master(const struct net_device *dev)
4274 {
4275 return dev->priv_flags & IFF_EBRIDGE;
4276 }
4277
4278 static inline bool netif_is_bridge_port(const struct net_device *dev)
4279 {
4280 return dev->priv_flags & IFF_BRIDGE_PORT;
4281 }
4282
4283 static inline bool netif_is_ovs_master(const struct net_device *dev)
4284 {
4285 return dev->priv_flags & IFF_OPENVSWITCH;
4286 }
4287
4288 static inline bool netif_is_ovs_port(const struct net_device *dev)
4289 {
4290 return dev->priv_flags & IFF_OVS_DATAPATH;
4291 }
4292
4293 static inline bool netif_is_team_master(const struct net_device *dev)
4294 {
4295 return dev->priv_flags & IFF_TEAM;
4296 }
4297
4298 static inline bool netif_is_team_port(const struct net_device *dev)
4299 {
4300 return dev->priv_flags & IFF_TEAM_PORT;
4301 }
4302
4303 static inline bool netif_is_lag_master(const struct net_device *dev)
4304 {
4305 return netif_is_bond_master(dev) || netif_is_team_master(dev);
4306 }
4307
4308 static inline bool netif_is_lag_port(const struct net_device *dev)
4309 {
4310 return netif_is_bond_slave(dev) || netif_is_team_port(dev);
4311 }
4312
4313 static inline bool netif_is_rxfh_configured(const struct net_device *dev)
4314 {
4315 return dev->priv_flags & IFF_RXFH_CONFIGURED;
4316 }
4317
4318 /* This device needs to keep skb dst for qdisc enqueue or ndo_start_xmit() */
4319 static inline void netif_keep_dst(struct net_device *dev)
4320 {
4321 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM);
4322 }
4323
4324 /* return true if dev can't cope with mtu frames that need vlan tag insertion */
4325 static inline bool netif_reduces_vlan_mtu(struct net_device *dev)
4326 {
4327 /* TODO: reserve and use an additional IFF bit, if we get more users */
4328 return dev->priv_flags & IFF_MACSEC;
4329 }
4330
4331 extern struct pernet_operations __net_initdata loopback_net_ops;
4332
4333 /* Logging, debugging and troubleshooting/diagnostic helpers. */
4334
4335 /* netdev_printk helpers, similar to dev_printk */
4336
4337 static inline const char *netdev_name(const struct net_device *dev)
4338 {
4339 if (!dev->name[0] || strchr(dev->name, '%'))
4340 return "(unnamed net_device)";
4341 return dev->name;
4342 }
4343
4344 static inline bool netdev_unregistering(const struct net_device *dev)
4345 {
4346 return dev->reg_state == NETREG_UNREGISTERING;
4347 }
4348
4349 static inline const char *netdev_reg_state(const struct net_device *dev)
4350 {
4351 switch (dev->reg_state) {
4352 case NETREG_UNINITIALIZED: return " (uninitialized)";
4353 case NETREG_REGISTERED: return "";
4354 case NETREG_UNREGISTERING: return " (unregistering)";
4355 case NETREG_UNREGISTERED: return " (unregistered)";
4356 case NETREG_RELEASED: return " (released)";
4357 case NETREG_DUMMY: return " (dummy)";
4358 }
4359
4360 WARN_ONCE(1, "%s: unknown reg_state %d\n", dev->name, dev->reg_state);
4361 return " (unknown)";
4362 }
4363
4364 __printf(3, 4)
4365 void netdev_printk(const char *level, const struct net_device *dev,
4366 const char *format, ...);
4367 __printf(2, 3)
4368 void netdev_emerg(const struct net_device *dev, const char *format, ...);
4369 __printf(2, 3)
4370 void netdev_alert(const struct net_device *dev, const char *format, ...);
4371 __printf(2, 3)
4372 void netdev_crit(const struct net_device *dev, const char *format, ...);
4373 __printf(2, 3)
4374 void netdev_err(const struct net_device *dev, const char *format, ...);
4375 __printf(2, 3)
4376 void netdev_warn(const struct net_device *dev, const char *format, ...);
4377 __printf(2, 3)
4378 void netdev_notice(const struct net_device *dev, const char *format, ...);
4379 __printf(2, 3)
4380 void netdev_info(const struct net_device *dev, const char *format, ...);
4381
4382 #define netdev_level_once(level, dev, fmt, ...) \
4383 do { \
4384 static bool __print_once __read_mostly; \
4385 \
4386 if (!__print_once) { \
4387 __print_once = true; \
4388 netdev_printk(level, dev, fmt, ##__VA_ARGS__); \
4389 } \
4390 } while (0)
4391
4392 #define netdev_emerg_once(dev, fmt, ...) \
4393 netdev_level_once(KERN_EMERG, dev, fmt, ##__VA_ARGS__)
4394 #define netdev_alert_once(dev, fmt, ...) \
4395 netdev_level_once(KERN_ALERT, dev, fmt, ##__VA_ARGS__)
4396 #define netdev_crit_once(dev, fmt, ...) \
4397 netdev_level_once(KERN_CRIT, dev, fmt, ##__VA_ARGS__)
4398 #define netdev_err_once(dev, fmt, ...) \
4399 netdev_level_once(KERN_ERR, dev, fmt, ##__VA_ARGS__)
4400 #define netdev_warn_once(dev, fmt, ...) \
4401 netdev_level_once(KERN_WARNING, dev, fmt, ##__VA_ARGS__)
4402 #define netdev_notice_once(dev, fmt, ...) \
4403 netdev_level_once(KERN_NOTICE, dev, fmt, ##__VA_ARGS__)
4404 #define netdev_info_once(dev, fmt, ...) \
4405 netdev_level_once(KERN_INFO, dev, fmt, ##__VA_ARGS__)
4406
4407 #define MODULE_ALIAS_NETDEV(device) \
4408 MODULE_ALIAS("netdev-" device)
4409
4410 #if defined(CONFIG_DYNAMIC_DEBUG)
4411 #define netdev_dbg(__dev, format, args...) \
4412 do { \
4413 dynamic_netdev_dbg(__dev, format, ##args); \
4414 } while (0)
4415 #elif defined(DEBUG)
4416 #define netdev_dbg(__dev, format, args...) \
4417 netdev_printk(KERN_DEBUG, __dev, format, ##args)
4418 #else
4419 #define netdev_dbg(__dev, format, args...) \
4420 ({ \
4421 if (0) \
4422 netdev_printk(KERN_DEBUG, __dev, format, ##args); \
4423 })
4424 #endif
4425
4426 #if defined(VERBOSE_DEBUG)
4427 #define netdev_vdbg netdev_dbg
4428 #else
4429
4430 #define netdev_vdbg(dev, format, args...) \
4431 ({ \
4432 if (0) \
4433 netdev_printk(KERN_DEBUG, dev, format, ##args); \
4434 0; \
4435 })
4436 #endif
4437
4438 /*
4439 * netdev_WARN() acts like dev_printk(), but with the key difference
4440 * of using a WARN/WARN_ON to get the message out, including the
4441 * file/line information and a backtrace.
4442 */
4443 #define netdev_WARN(dev, format, args...) \
4444 WARN(1, "netdevice: %s%s\n" format, netdev_name(dev), \
4445 netdev_reg_state(dev), ##args)
4446
4447 #define netdev_WARN_ONCE(dev, format, args...) \
4448 WARN_ONCE(1, "netdevice: %s%s\n" format, netdev_name(dev), \
4449 netdev_reg_state(dev), ##args)
4450
4451 /* netif printk helpers, similar to netdev_printk */
4452
4453 #define netif_printk(priv, type, level, dev, fmt, args...) \
4454 do { \
4455 if (netif_msg_##type(priv)) \
4456 netdev_printk(level, (dev), fmt, ##args); \
4457 } while (0)
4458
4459 #define netif_level(level, priv, type, dev, fmt, args...) \
4460 do { \
4461 if (netif_msg_##type(priv)) \
4462 netdev_##level(dev, fmt, ##args); \
4463 } while (0)
4464
4465 #define netif_emerg(priv, type, dev, fmt, args...) \
4466 netif_level(emerg, priv, type, dev, fmt, ##args)
4467 #define netif_alert(priv, type, dev, fmt, args...) \
4468 netif_level(alert, priv, type, dev, fmt, ##args)
4469 #define netif_crit(priv, type, dev, fmt, args...) \
4470 netif_level(crit, priv, type, dev, fmt, ##args)
4471 #define netif_err(priv, type, dev, fmt, args...) \
4472 netif_level(err, priv, type, dev, fmt, ##args)
4473 #define netif_warn(priv, type, dev, fmt, args...) \
4474 netif_level(warn, priv, type, dev, fmt, ##args)
4475 #define netif_notice(priv, type, dev, fmt, args...) \
4476 netif_level(notice, priv, type, dev, fmt, ##args)
4477 #define netif_info(priv, type, dev, fmt, args...) \
4478 netif_level(info, priv, type, dev, fmt, ##args)
4479
4480 #if defined(CONFIG_DYNAMIC_DEBUG)
4481 #define netif_dbg(priv, type, netdev, format, args...) \
4482 do { \
4483 if (netif_msg_##type(priv)) \
4484 dynamic_netdev_dbg(netdev, format, ##args); \
4485 } while (0)
4486 #elif defined(DEBUG)
4487 #define netif_dbg(priv, type, dev, format, args...) \
4488 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
4489 #else
4490 #define netif_dbg(priv, type, dev, format, args...) \
4491 ({ \
4492 if (0) \
4493 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
4494 0; \
4495 })
4496 #endif
4497
4498 /* if @cond then downgrade to debug, else print at @level */
4499 #define netif_cond_dbg(priv, type, netdev, cond, level, fmt, args...) \
4500 do { \
4501 if (cond) \
4502 netif_dbg(priv, type, netdev, fmt, ##args); \
4503 else \
4504 netif_ ## level(priv, type, netdev, fmt, ##args); \
4505 } while (0)
4506
4507 #if defined(VERBOSE_DEBUG)
4508 #define netif_vdbg netif_dbg
4509 #else
4510 #define netif_vdbg(priv, type, dev, format, args...) \
4511 ({ \
4512 if (0) \
4513 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
4514 0; \
4515 })
4516 #endif
4517
4518 /*
4519 * The list of packet types we will receive (as opposed to discard)
4520 * and the routines to invoke.
4521 *
4522 * Why 16. Because with 16 the only overlap we get on a hash of the
4523 * low nibble of the protocol value is RARP/SNAP/X.25.
4524 *
4525 * 0800 IP
4526 * 0001 802.3
4527 * 0002 AX.25
4528 * 0004 802.2
4529 * 8035 RARP
4530 * 0005 SNAP
4531 * 0805 X.25
4532 * 0806 ARP
4533 * 8137 IPX
4534 * 0009 Localtalk
4535 * 86DD IPv6
4536 */
4537 #define PTYPE_HASH_SIZE (16)
4538 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
4539
4540 #endif /* _LINUX_NETDEVICE_H */