Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

Linux/include/linux/netdevice.h

  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/dmaengine.h>
 39 #include <linux/workqueue.h>
 40 #include <linux/dynamic_queue_limits.h>
 41 
 42 #include <linux/ethtool.h>
 43 #include <net/net_namespace.h>
 44 #include <net/dsa.h>
 45 #ifdef CONFIG_DCB
 46 #include <net/dcbnl.h>
 47 #endif
 48 #include <net/netprio_cgroup.h>
 49 
 50 #include <linux/netdev_features.h>
 51 #include <linux/neighbour.h>
 52 #include <uapi/linux/netdevice.h>
 53 #include <uapi/linux/if_bonding.h>
 54 #include <uapi/linux/pkt_cls.h>
 55 
 56 struct netpoll_info;
 57 struct device;
 58 struct phy_device;
 59 /* 802.11 specific */
 60 struct wireless_dev;
 61 /* 802.15.4 specific */
 62 struct wpan_dev;
 63 struct mpls_dev;
 64 
 65 void netdev_set_default_ethtool_ops(struct net_device *dev,
 66                                     const struct ethtool_ops *ops);
 67 
 68 /* Backlog congestion levels */
 69 #define NET_RX_SUCCESS          0       /* keep 'em coming, baby */
 70 #define NET_RX_DROP             1       /* packet dropped */
 71 
 72 /*
 73  * Transmit return codes: transmit return codes originate from three different
 74  * namespaces:
 75  *
 76  * - qdisc return codes
 77  * - driver transmit return codes
 78  * - errno values
 79  *
 80  * Drivers are allowed to return any one of those in their hard_start_xmit()
 81  * function. Real network devices commonly used with qdiscs should only return
 82  * the driver transmit return codes though - when qdiscs are used, the actual
 83  * transmission happens asynchronously, so the value is not propagated to
 84  * higher layers. Virtual network devices transmit synchronously; in this case
 85  * the driver transmit return codes are consumed by dev_queue_xmit(), and all
 86  * others are propagated to higher layers.
 87  */
 88 
 89 /* qdisc ->enqueue() return codes. */
 90 #define NET_XMIT_SUCCESS        0x00
 91 #define NET_XMIT_DROP           0x01    /* skb dropped                  */
 92 #define NET_XMIT_CN             0x02    /* congestion notification      */
 93 #define NET_XMIT_POLICED        0x03    /* skb is shot by police        */
 94 #define NET_XMIT_MASK           0x0f    /* qdisc flags in net/sch_generic.h */
 95 
 96 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
 97  * indicates that the device will soon be dropping packets, or already drops
 98  * some packets of the same priority; prompting us to send less aggressively. */
 99 #define net_xmit_eval(e)        ((e) == NET_XMIT_CN ? 0 : (e))
100 #define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
101 
102 /* Driver transmit return codes */
103 #define NETDEV_TX_MASK          0xf0
104 
105 enum netdev_tx {
106         __NETDEV_TX_MIN  = INT_MIN,     /* make sure enum is signed */
107         NETDEV_TX_OK     = 0x00,        /* driver took care of packet */
108         NETDEV_TX_BUSY   = 0x10,        /* driver tx path was busy*/
109         NETDEV_TX_LOCKED = 0x20,        /* driver tx lock was already taken */
110 };
111 typedef enum netdev_tx netdev_tx_t;
112 
113 /*
114  * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
115  * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
116  */
117 static inline bool dev_xmit_complete(int rc)
118 {
119         /*
120          * Positive cases with an skb consumed by a driver:
121          * - successful transmission (rc == NETDEV_TX_OK)
122          * - error while transmitting (rc < 0)
123          * - error while queueing to a different device (rc & NET_XMIT_MASK)
124          */
125         if (likely(rc < NET_XMIT_MASK))
126                 return true;
127 
128         return false;
129 }
130 
131 /*
132  *      Compute the worst-case header length according to the protocols
133  *      used.
134  */
135 
136 #if defined(CONFIG_HYPERV_NET)
137 # define LL_MAX_HEADER 128
138 #elif defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
139 # if defined(CONFIG_MAC80211_MESH)
140 #  define LL_MAX_HEADER 128
141 # else
142 #  define LL_MAX_HEADER 96
143 # endif
144 #else
145 # define LL_MAX_HEADER 32
146 #endif
147 
148 #if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \
149     !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL)
150 #define MAX_HEADER LL_MAX_HEADER
151 #else
152 #define MAX_HEADER (LL_MAX_HEADER + 48)
153 #endif
154 
155 /*
156  *      Old network device statistics. Fields are native words
157  *      (unsigned long) so they can be read and written atomically.
158  */
159 
160 struct net_device_stats {
161         unsigned long   rx_packets;
162         unsigned long   tx_packets;
163         unsigned long   rx_bytes;
164         unsigned long   tx_bytes;
165         unsigned long   rx_errors;
166         unsigned long   tx_errors;
167         unsigned long   rx_dropped;
168         unsigned long   tx_dropped;
169         unsigned long   multicast;
170         unsigned long   collisions;
171         unsigned long   rx_length_errors;
172         unsigned long   rx_over_errors;
173         unsigned long   rx_crc_errors;
174         unsigned long   rx_frame_errors;
175         unsigned long   rx_fifo_errors;
176         unsigned long   rx_missed_errors;
177         unsigned long   tx_aborted_errors;
178         unsigned long   tx_carrier_errors;
179         unsigned long   tx_fifo_errors;
180         unsigned long   tx_heartbeat_errors;
181         unsigned long   tx_window_errors;
182         unsigned long   rx_compressed;
183         unsigned long   tx_compressed;
184 };
185 
186 
187 #include <linux/cache.h>
188 #include <linux/skbuff.h>
189 
190 #ifdef CONFIG_RPS
191 #include <linux/static_key.h>
192 extern struct static_key rps_needed;
193 #endif
194 
195 struct neighbour;
196 struct neigh_parms;
197 struct sk_buff;
198 
199 struct netdev_hw_addr {
200         struct list_head        list;
201         unsigned char           addr[MAX_ADDR_LEN];
202         unsigned char           type;
203 #define NETDEV_HW_ADDR_T_LAN            1
204 #define NETDEV_HW_ADDR_T_SAN            2
205 #define NETDEV_HW_ADDR_T_SLAVE          3
206 #define NETDEV_HW_ADDR_T_UNICAST        4
207 #define NETDEV_HW_ADDR_T_MULTICAST      5
208         bool                    global_use;
209         int                     sync_cnt;
210         int                     refcount;
211         int                     synced;
212         struct rcu_head         rcu_head;
213 };
214 
215 struct netdev_hw_addr_list {
216         struct list_head        list;
217         int                     count;
218 };
219 
220 #define netdev_hw_addr_list_count(l) ((l)->count)
221 #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
222 #define netdev_hw_addr_list_for_each(ha, l) \
223         list_for_each_entry(ha, &(l)->list, list)
224 
225 #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
226 #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
227 #define netdev_for_each_uc_addr(ha, dev) \
228         netdev_hw_addr_list_for_each(ha, &(dev)->uc)
229 
230 #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
231 #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
232 #define netdev_for_each_mc_addr(ha, dev) \
233         netdev_hw_addr_list_for_each(ha, &(dev)->mc)
234 
235 struct hh_cache {
236         u16             hh_len;
237         u16             __pad;
238         seqlock_t       hh_lock;
239 
240         /* cached hardware header; allow for machine alignment needs.        */
241 #define HH_DATA_MOD     16
242 #define HH_DATA_OFF(__len) \
243         (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
244 #define HH_DATA_ALIGN(__len) \
245         (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
246         unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
247 };
248 
249 /* Reserve HH_DATA_MOD byte-aligned hard_header_len, but at least that much.
250  * Alternative is:
251  *   dev->hard_header_len ? (dev->hard_header_len +
252  *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
253  *
254  * We could use other alignment values, but we must maintain the
255  * relationship HH alignment <= LL alignment.
256  */
257 #define LL_RESERVED_SPACE(dev) \
258         ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
259 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
260         ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
261 
262 struct header_ops {
263         int     (*create) (struct sk_buff *skb, struct net_device *dev,
264                            unsigned short type, const void *daddr,
265                            const void *saddr, unsigned int len);
266         int     (*parse)(const struct sk_buff *skb, unsigned char *haddr);
267         int     (*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type);
268         void    (*cache_update)(struct hh_cache *hh,
269                                 const struct net_device *dev,
270                                 const unsigned char *haddr);
271         bool    (*validate)(const char *ll_header, unsigned int len);
272 };
273 
274 /* These flag bits are private to the generic network queueing
275  * layer; they may not be explicitly referenced by any other
276  * code.
277  */
278 
279 enum netdev_state_t {
280         __LINK_STATE_START,
281         __LINK_STATE_PRESENT,
282         __LINK_STATE_NOCARRIER,
283         __LINK_STATE_LINKWATCH_PENDING,
284         __LINK_STATE_DORMANT,
285 };
286 
287 
288 /*
289  * This structure holds boot-time configured netdevice settings. They
290  * are then used in the device probing.
291  */
292 struct netdev_boot_setup {
293         char name[IFNAMSIZ];
294         struct ifmap map;
295 };
296 #define NETDEV_BOOT_SETUP_MAX 8
297 
298 int __init netdev_boot_setup(char *str);
299 
300 /*
301  * Structure for NAPI scheduling similar to tasklet but with weighting
302  */
303 struct napi_struct {
304         /* The poll_list must only be managed by the entity which
305          * changes the state of the NAPI_STATE_SCHED bit.  This means
306          * whoever atomically sets that bit can add this napi_struct
307          * to the per-CPU poll_list, and whoever clears that bit
308          * can remove from the list right before clearing the bit.
309          */
310         struct list_head        poll_list;
311 
312         unsigned long           state;
313         int                     weight;
314         unsigned int            gro_count;
315         int                     (*poll)(struct napi_struct *, int);
316 #ifdef CONFIG_NETPOLL
317         spinlock_t              poll_lock;
318         int                     poll_owner;
319 #endif
320         struct net_device       *dev;
321         struct sk_buff          *gro_list;
322         struct sk_buff          *skb;
323         struct hrtimer          timer;
324         struct list_head        dev_list;
325         struct hlist_node       napi_hash_node;
326         unsigned int            napi_id;
327 };
328 
329 enum {
330         NAPI_STATE_SCHED,       /* Poll is scheduled */
331         NAPI_STATE_DISABLE,     /* Disable pending */
332         NAPI_STATE_NPSVC,       /* Netpoll - don't dequeue from poll_list */
333         NAPI_STATE_HASHED,      /* In NAPI hash (busy polling possible) */
334         NAPI_STATE_NO_BUSY_POLL,/* Do not add in napi_hash, no busy polling */
335 };
336 
337 enum gro_result {
338         GRO_MERGED,
339         GRO_MERGED_FREE,
340         GRO_HELD,
341         GRO_NORMAL,
342         GRO_DROP,
343 };
344 typedef enum gro_result gro_result_t;
345 
346 /*
347  * enum rx_handler_result - Possible return values for rx_handlers.
348  * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
349  * further.
350  * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
351  * case skb->dev was changed by rx_handler.
352  * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
353  * @RX_HANDLER_PASS: Do nothing, pass the skb as if no rx_handler was called.
354  *
355  * rx_handlers are functions called from inside __netif_receive_skb(), to do
356  * special processing of the skb, prior to delivery to protocol handlers.
357  *
358  * Currently, a net_device can only have a single rx_handler registered. Trying
359  * to register a second rx_handler will return -EBUSY.
360  *
361  * To register a rx_handler on a net_device, use netdev_rx_handler_register().
362  * To unregister a rx_handler on a net_device, use
363  * netdev_rx_handler_unregister().
364  *
365  * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
366  * do with the skb.
367  *
368  * If the rx_handler consumed the skb in some way, it should return
369  * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
370  * the skb to be delivered in some other way.
371  *
372  * If the rx_handler changed skb->dev, to divert the skb to another
373  * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
374  * new device will be called if it exists.
375  *
376  * If the rx_handler decides the skb should be ignored, it should return
377  * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
378  * are registered on exact device (ptype->dev == skb->dev).
379  *
380  * If the rx_handler didn't change skb->dev, but wants the skb to be normally
381  * delivered, it should return RX_HANDLER_PASS.
382  *
383  * A device without a registered rx_handler will behave as if rx_handler
384  * returned RX_HANDLER_PASS.
385  */
386 
387 enum rx_handler_result {
388         RX_HANDLER_CONSUMED,
389         RX_HANDLER_ANOTHER,
390         RX_HANDLER_EXACT,
391         RX_HANDLER_PASS,
392 };
393 typedef enum rx_handler_result rx_handler_result_t;
394 typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
395 
396 void __napi_schedule(struct napi_struct *n);
397 void __napi_schedule_irqoff(struct napi_struct *n);
398 
399 static inline bool napi_disable_pending(struct napi_struct *n)
400 {
401         return test_bit(NAPI_STATE_DISABLE, &n->state);
402 }
403 
404 /**
405  *      napi_schedule_prep - check if NAPI can be scheduled
406  *      @n: NAPI context
407  *
408  * Test if NAPI routine is already running, and if not mark
409  * it as running.  This is used as a condition variable to
410  * insure only one NAPI poll instance runs.  We also make
411  * sure there is no pending NAPI disable.
412  */
413 static inline bool napi_schedule_prep(struct napi_struct *n)
414 {
415         return !napi_disable_pending(n) &&
416                 !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
417 }
418 
419 /**
420  *      napi_schedule - schedule NAPI poll
421  *      @n: NAPI context
422  *
423  * Schedule NAPI poll routine to be called if it is not already
424  * running.
425  */
426 static inline void napi_schedule(struct napi_struct *n)
427 {
428         if (napi_schedule_prep(n))
429                 __napi_schedule(n);
430 }
431 
432 /**
433  *      napi_schedule_irqoff - schedule NAPI poll
434  *      @n: NAPI context
435  *
436  * Variant of napi_schedule(), assuming hard irqs are masked.
437  */
438 static inline void napi_schedule_irqoff(struct napi_struct *n)
439 {
440         if (napi_schedule_prep(n))
441                 __napi_schedule_irqoff(n);
442 }
443 
444 /* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
445 static inline bool napi_reschedule(struct napi_struct *napi)
446 {
447         if (napi_schedule_prep(napi)) {
448                 __napi_schedule(napi);
449                 return true;
450         }
451         return false;
452 }
453 
454 void __napi_complete(struct napi_struct *n);
455 void napi_complete_done(struct napi_struct *n, int work_done);
456 /**
457  *      napi_complete - NAPI processing complete
458  *      @n: NAPI context
459  *
460  * Mark NAPI processing as complete.
461  * Consider using napi_complete_done() instead.
462  */
463 static inline void napi_complete(struct napi_struct *n)
464 {
465         return napi_complete_done(n, 0);
466 }
467 
468 /**
469  *      napi_hash_add - add a NAPI to global hashtable
470  *      @napi: NAPI context
471  *
472  * Generate a new napi_id and store a @napi under it in napi_hash.
473  * Used for busy polling (CONFIG_NET_RX_BUSY_POLL).
474  * Note: This is normally automatically done from netif_napi_add(),
475  * so might disappear in a future Linux version.
476  */
477 void napi_hash_add(struct napi_struct *napi);
478 
479 /**
480  *      napi_hash_del - remove a NAPI from global table
481  *      @napi: NAPI context
482  *
483  * Warning: caller must observe RCU grace period
484  * before freeing memory containing @napi, if
485  * this function returns true.
486  * Note: core networking stack automatically calls it
487  * from netif_napi_del().
488  * Drivers might want to call this helper to combine all
489  * the needed RCU grace periods into a single one.
490  */
491 bool napi_hash_del(struct napi_struct *napi);
492 
493 /**
494  *      napi_disable - prevent NAPI from scheduling
495  *      @n: NAPI context
496  *
497  * Stop NAPI from being scheduled on this context.
498  * Waits till any outstanding processing completes.
499  */
500 void napi_disable(struct napi_struct *n);
501 
502 /**
503  *      napi_enable - enable NAPI scheduling
504  *      @n: NAPI context
505  *
506  * Resume NAPI from being scheduled on this context.
507  * Must be paired with napi_disable.
508  */
509 static inline void napi_enable(struct napi_struct *n)
510 {
511         BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
512         smp_mb__before_atomic();
513         clear_bit(NAPI_STATE_SCHED, &n->state);
514         clear_bit(NAPI_STATE_NPSVC, &n->state);
515 }
516 
517 /**
518  *      napi_synchronize - wait until NAPI is not running
519  *      @n: NAPI context
520  *
521  * Wait until NAPI is done being scheduled on this context.
522  * Waits till any outstanding processing completes but
523  * does not disable future activations.
524  */
525 static inline void napi_synchronize(const struct napi_struct *n)
526 {
527         if (IS_ENABLED(CONFIG_SMP))
528                 while (test_bit(NAPI_STATE_SCHED, &n->state))
529                         msleep(1);
530         else
531                 barrier();
532 }
533 
534 enum netdev_queue_state_t {
535         __QUEUE_STATE_DRV_XOFF,
536         __QUEUE_STATE_STACK_XOFF,
537         __QUEUE_STATE_FROZEN,
538 };
539 
540 #define QUEUE_STATE_DRV_XOFF    (1 << __QUEUE_STATE_DRV_XOFF)
541 #define QUEUE_STATE_STACK_XOFF  (1 << __QUEUE_STATE_STACK_XOFF)
542 #define QUEUE_STATE_FROZEN      (1 << __QUEUE_STATE_FROZEN)
543 
544 #define QUEUE_STATE_ANY_XOFF    (QUEUE_STATE_DRV_XOFF | QUEUE_STATE_STACK_XOFF)
545 #define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF | \
546                                         QUEUE_STATE_FROZEN)
547 #define QUEUE_STATE_DRV_XOFF_OR_FROZEN (QUEUE_STATE_DRV_XOFF | \
548                                         QUEUE_STATE_FROZEN)
549 
550 /*
551  * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue.  The
552  * netif_tx_* functions below are used to manipulate this flag.  The
553  * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
554  * queue independently.  The netif_xmit_*stopped functions below are called
555  * to check if the queue has been stopped by the driver or stack (either
556  * of the XOFF bits are set in the state).  Drivers should not need to call
557  * netif_xmit*stopped functions, they should only be using netif_tx_*.
558  */
559 
560 struct netdev_queue {
561 /*
562  * read-mostly part
563  */
564         struct net_device       *dev;
565         struct Qdisc __rcu      *qdisc;
566         struct Qdisc            *qdisc_sleeping;
567 #ifdef CONFIG_SYSFS
568         struct kobject          kobj;
569 #endif
570 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
571         int                     numa_node;
572 #endif
573 /*
574  * write-mostly part
575  */
576         spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
577         int                     xmit_lock_owner;
578         /*
579          * please use this field instead of dev->trans_start
580          */
581         unsigned long           trans_start;
582 
583         /*
584          * Number of TX timeouts for this queue
585          * (/sys/class/net/DEV/Q/trans_timeout)
586          */
587         unsigned long           trans_timeout;
588 
589         unsigned long           state;
590 
591 #ifdef CONFIG_BQL
592         struct dql              dql;
593 #endif
594         unsigned long           tx_maxrate;
595 } ____cacheline_aligned_in_smp;
596 
597 static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
598 {
599 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
600         return q->numa_node;
601 #else
602         return NUMA_NO_NODE;
603 #endif
604 }
605 
606 static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
607 {
608 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
609         q->numa_node = node;
610 #endif
611 }
612 
613 #ifdef CONFIG_RPS
614 /*
615  * This structure holds an RPS map which can be of variable length.  The
616  * map is an array of CPUs.
617  */
618 struct rps_map {
619         unsigned int len;
620         struct rcu_head rcu;
621         u16 cpus[0];
622 };
623 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
624 
625 /*
626  * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
627  * tail pointer for that CPU's input queue at the time of last enqueue, and
628  * a hardware filter index.
629  */
630 struct rps_dev_flow {
631         u16 cpu;
632         u16 filter;
633         unsigned int last_qtail;
634 };
635 #define RPS_NO_FILTER 0xffff
636 
637 /*
638  * The rps_dev_flow_table structure contains a table of flow mappings.
639  */
640 struct rps_dev_flow_table {
641         unsigned int mask;
642         struct rcu_head rcu;
643         struct rps_dev_flow flows[0];
644 };
645 #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
646     ((_num) * sizeof(struct rps_dev_flow)))
647 
648 /*
649  * The rps_sock_flow_table contains mappings of flows to the last CPU
650  * on which they were processed by the application (set in recvmsg).
651  * Each entry is a 32bit value. Upper part is the high-order bits
652  * of flow hash, lower part is CPU number.
653  * rps_cpu_mask is used to partition the space, depending on number of
654  * possible CPUs : rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1
655  * For example, if 64 CPUs are possible, rps_cpu_mask = 0x3f,
656  * meaning we use 32-6=26 bits for the hash.
657  */
658 struct rps_sock_flow_table {
659         u32     mask;
660 
661         u32     ents[0] ____cacheline_aligned_in_smp;
662 };
663 #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (offsetof(struct rps_sock_flow_table, ents[_num]))
664 
665 #define RPS_NO_CPU 0xffff
666 
667 extern u32 rps_cpu_mask;
668 extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
669 
670 static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
671                                         u32 hash)
672 {
673         if (table && hash) {
674                 unsigned int index = hash & table->mask;
675                 u32 val = hash & ~rps_cpu_mask;
676 
677                 /* We only give a hint, preemption can change CPU under us */
678                 val |= raw_smp_processor_id();
679 
680                 if (table->ents[index] != val)
681                         table->ents[index] = val;
682         }
683 }
684 
685 #ifdef CONFIG_RFS_ACCEL
686 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id,
687                          u16 filter_id);
688 #endif
689 #endif /* CONFIG_RPS */
690 
691 /* This structure contains an instance of an RX queue. */
692 struct netdev_rx_queue {
693 #ifdef CONFIG_RPS
694         struct rps_map __rcu            *rps_map;
695         struct rps_dev_flow_table __rcu *rps_flow_table;
696 #endif
697         struct kobject                  kobj;
698         struct net_device               *dev;
699 } ____cacheline_aligned_in_smp;
700 
701 /*
702  * RX queue sysfs structures and functions.
703  */
704 struct rx_queue_attribute {
705         struct attribute attr;
706         ssize_t (*show)(struct netdev_rx_queue *queue,
707             struct rx_queue_attribute *attr, char *buf);
708         ssize_t (*store)(struct netdev_rx_queue *queue,
709             struct rx_queue_attribute *attr, const char *buf, size_t len);
710 };
711 
712 #ifdef CONFIG_XPS
713 /*
714  * This structure holds an XPS map which can be of variable length.  The
715  * map is an array of queues.
716  */
717 struct xps_map {
718         unsigned int len;
719         unsigned int alloc_len;
720         struct rcu_head rcu;
721         u16 queues[0];
722 };
723 #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
724 #define XPS_MIN_MAP_ALLOC ((L1_CACHE_ALIGN(offsetof(struct xps_map, queues[1])) \
725        - sizeof(struct xps_map)) / sizeof(u16))
726 
727 /*
728  * This structure holds all XPS maps for device.  Maps are indexed by CPU.
729  */
730 struct xps_dev_maps {
731         struct rcu_head rcu;
732         struct xps_map __rcu *cpu_map[0];
733 };
734 #define XPS_DEV_MAPS_SIZE (sizeof(struct xps_dev_maps) +                \
735     (nr_cpu_ids * sizeof(struct xps_map *)))
736 #endif /* CONFIG_XPS */
737 
738 #define TC_MAX_QUEUE    16
739 #define TC_BITMASK      15
740 /* HW offloaded queuing disciplines txq count and offset maps */
741 struct netdev_tc_txq {
742         u16 count;
743         u16 offset;
744 };
745 
746 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
747 /*
748  * This structure is to hold information about the device
749  * configured to run FCoE protocol stack.
750  */
751 struct netdev_fcoe_hbainfo {
752         char    manufacturer[64];
753         char    serial_number[64];
754         char    hardware_version[64];
755         char    driver_version[64];
756         char    optionrom_version[64];
757         char    firmware_version[64];
758         char    model[256];
759         char    model_description[256];
760 };
761 #endif
762 
763 #define MAX_PHYS_ITEM_ID_LEN 32
764 
765 /* This structure holds a unique identifier to identify some
766  * physical item (port for example) used by a netdevice.
767  */
768 struct netdev_phys_item_id {
769         unsigned char id[MAX_PHYS_ITEM_ID_LEN];
770         unsigned char id_len;
771 };
772 
773 static inline bool netdev_phys_item_id_same(struct netdev_phys_item_id *a,
774                                             struct netdev_phys_item_id *b)
775 {
776         return a->id_len == b->id_len &&
777                memcmp(a->id, b->id, a->id_len) == 0;
778 }
779 
780 typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
781                                        struct sk_buff *skb);
782 
783 /* These structures hold the attributes of qdisc and classifiers
784  * that are being passed to the netdevice through the setup_tc op.
785  */
786 enum {
787         TC_SETUP_MQPRIO,
788         TC_SETUP_CLSU32,
789         TC_SETUP_CLSFLOWER,
790 };
791 
792 struct tc_cls_u32_offload;
793 
794 struct tc_to_netdev {
795         unsigned int type;
796         union {
797                 u8 tc;
798                 struct tc_cls_u32_offload *cls_u32;
799                 struct tc_cls_flower_offload *cls_flower;
800         };
801 };
802 
803 
804 /*
805  * This structure defines the management hooks for network devices.
806  * The following hooks can be defined; unless noted otherwise, they are
807  * optional and can be filled with a null pointer.
808  *
809  * int (*ndo_init)(struct net_device *dev);
810  *     This function is called once when a network device is registered.
811  *     The network device can use this for any late stage initialization
812  *     or semantic validation. It can fail with an error code which will
813  *     be propagated back to register_netdev.
814  *
815  * void (*ndo_uninit)(struct net_device *dev);
816  *     This function is called when device is unregistered or when registration
817  *     fails. It is not called if init fails.
818  *
819  * int (*ndo_open)(struct net_device *dev);
820  *     This function is called when a network device transitions to the up
821  *     state.
822  *
823  * int (*ndo_stop)(struct net_device *dev);
824  *     This function is called when a network device transitions to the down
825  *     state.
826  *
827  * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
828  *                               struct net_device *dev);
829  *      Called when a packet needs to be transmitted.
830  *      Returns NETDEV_TX_OK.  Can return NETDEV_TX_BUSY, but you should stop
831  *      the queue before that can happen; it's for obsolete devices and weird
832  *      corner cases, but the stack really does a non-trivial amount
833  *      of useless work if you return NETDEV_TX_BUSY.
834  *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
835  *      Required; cannot be NULL.
836  *
837  * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
838  *              netdev_features_t features);
839  *      Adjusts the requested feature flags according to device-specific
840  *      constraints, and returns the resulting flags. Must not modify
841  *      the device state.
842  *
843  * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb,
844  *                         void *accel_priv, select_queue_fallback_t fallback);
845  *      Called to decide which queue to use when device supports multiple
846  *      transmit queues.
847  *
848  * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
849  *      This function is called to allow device receiver to make
850  *      changes to configuration when multicast or promiscuous is enabled.
851  *
852  * void (*ndo_set_rx_mode)(struct net_device *dev);
853  *      This function is called device changes address list filtering.
854  *      If driver handles unicast address filtering, it should set
855  *      IFF_UNICAST_FLT in its priv_flags.
856  *
857  * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
858  *      This function  is called when the Media Access Control address
859  *      needs to be changed. If this interface is not defined, the
860  *      MAC address can not be changed.
861  *
862  * int (*ndo_validate_addr)(struct net_device *dev);
863  *      Test if Media Access Control address is valid for the device.
864  *
865  * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
866  *      Called when a user requests an ioctl which can't be handled by
867  *      the generic interface code. If not defined ioctls return
868  *      not supported error code.
869  *
870  * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
871  *      Used to set network devices bus interface parameters. This interface
872  *      is retained for legacy reasons; new devices should use the bus
873  *      interface (PCI) for low level management.
874  *
875  * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
876  *      Called when a user wants to change the Maximum Transfer Unit
877  *      of a device. If not defined, any request to change MTU will
878  *      will return an error.
879  *
880  * void (*ndo_tx_timeout)(struct net_device *dev);
881  *      Callback used when the transmitter has not made any progress
882  *      for dev->watchdog ticks.
883  *
884  * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
885  *                      struct rtnl_link_stats64 *storage);
886  * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
887  *      Called when a user wants to get the network device usage
888  *      statistics. Drivers must do one of the following:
889  *      1. Define @ndo_get_stats64 to fill in a zero-initialised
890  *         rtnl_link_stats64 structure passed by the caller.
891  *      2. Define @ndo_get_stats to update a net_device_stats structure
892  *         (which should normally be dev->stats) and return a pointer to
893  *         it. The structure may be changed asynchronously only if each
894  *         field is written atomically.
895  *      3. Update dev->stats asynchronously and atomically, and define
896  *         neither operation.
897  *
898  * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16 vid);
899  *      If device supports VLAN filtering this function is called when a
900  *      VLAN id is registered.
901  *
902  * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, __be16 proto, u16 vid);
903  *      If device supports VLAN filtering this function is called when a
904  *      VLAN id is unregistered.
905  *
906  * void (*ndo_poll_controller)(struct net_device *dev);
907  *
908  *      SR-IOV management functions.
909  * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
910  * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
911  * int (*ndo_set_vf_rate)(struct net_device *dev, int vf, int min_tx_rate,
912  *                        int max_tx_rate);
913  * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
914  * int (*ndo_set_vf_trust)(struct net_device *dev, int vf, bool setting);
915  * int (*ndo_get_vf_config)(struct net_device *dev,
916  *                          int vf, struct ifla_vf_info *ivf);
917  * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state);
918  * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
919  *                        struct nlattr *port[]);
920  *
921  *      Enable or disable the VF ability to query its RSS Redirection Table and
922  *      Hash Key. This is needed since on some devices VF share this information
923  *      with PF and querying it may introduce a theoretical security risk.
924  * int (*ndo_set_vf_rss_query_en)(struct net_device *dev, int vf, bool setting);
925  * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
926  * int (*ndo_setup_tc)(struct net_device *dev, u8 tc)
927  *      Called to setup 'tc' number of traffic classes in the net device. This
928  *      is always called from the stack with the rtnl lock held and netif tx
929  *      queues stopped. This allows the netdevice to perform queue management
930  *      safely.
931  *
932  *      Fiber Channel over Ethernet (FCoE) offload functions.
933  * int (*ndo_fcoe_enable)(struct net_device *dev);
934  *      Called when the FCoE protocol stack wants to start using LLD for FCoE
935  *      so the underlying device can perform whatever needed configuration or
936  *      initialization to support acceleration of FCoE traffic.
937  *
938  * int (*ndo_fcoe_disable)(struct net_device *dev);
939  *      Called when the FCoE protocol stack wants to stop using LLD for FCoE
940  *      so the underlying device can perform whatever needed clean-ups to
941  *      stop supporting acceleration of FCoE traffic.
942  *
943  * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid,
944  *                           struct scatterlist *sgl, unsigned int sgc);
945  *      Called when the FCoE Initiator wants to initialize an I/O that
946  *      is a possible candidate for Direct Data Placement (DDP). The LLD can
947  *      perform necessary setup and returns 1 to indicate the device is set up
948  *      successfully to perform DDP on this I/O, otherwise this returns 0.
949  *
950  * int (*ndo_fcoe_ddp_done)(struct net_device *dev,  u16 xid);
951  *      Called when the FCoE Initiator/Target is done with the DDPed I/O as
952  *      indicated by the FC exchange id 'xid', so the underlying device can
953  *      clean up and reuse resources for later DDP requests.
954  *
955  * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid,
956  *                            struct scatterlist *sgl, unsigned int sgc);
957  *      Called when the FCoE Target wants to initialize an I/O that
958  *      is a possible candidate for Direct Data Placement (DDP). The LLD can
959  *      perform necessary setup and returns 1 to indicate the device is set up
960  *      successfully to perform DDP on this I/O, otherwise this returns 0.
961  *
962  * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
963  *                             struct netdev_fcoe_hbainfo *hbainfo);
964  *      Called when the FCoE Protocol stack wants information on the underlying
965  *      device. This information is utilized by the FCoE protocol stack to
966  *      register attributes with Fiber Channel management service as per the
967  *      FC-GS Fabric Device Management Information(FDMI) specification.
968  *
969  * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type);
970  *      Called when the underlying device wants to override default World Wide
971  *      Name (WWN) generation mechanism in FCoE protocol stack to pass its own
972  *      World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE
973  *      protocol stack to use.
974  *
975  *      RFS acceleration.
976  * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb,
977  *                          u16 rxq_index, u32 flow_id);
978  *      Set hardware filter for RFS.  rxq_index is the target queue index;
979  *      flow_id is a flow ID to be passed to rps_may_expire_flow() later.
980  *      Return the filter ID on success, or a negative error code.
981  *
982  *      Slave management functions (for bridge, bonding, etc).
983  * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
984  *      Called to make another netdev an underling.
985  *
986  * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
987  *      Called to release previously enslaved netdev.
988  *
989  *      Feature/offload setting functions.
990  * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
991  *      Called to update device configuration to new features. Passed
992  *      feature set might be less than what was returned by ndo_fix_features()).
993  *      Must return >0 or -errno if it changed dev->features itself.
994  *
995  * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
996  *                    struct net_device *dev,
997  *                    const unsigned char *addr, u16 vid, u16 flags)
998  *      Adds an FDB entry to dev for addr.
999  * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[],
1000  *                    struct net_device *dev,
1001  *                    const unsigned char *addr, u16 vid)
1002  *      Deletes the FDB entry from dev coresponding to addr.
1003  * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
1004  *                     struct net_device *dev, struct net_device *filter_dev,
1005  *                     int idx)
1006  *      Used to add FDB entries to dump requests. Implementers should add
1007  *      entries to skb and update idx with the number of entries.
1008  *
1009  * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh,
1010  *                           u16 flags)
1011  * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq,
1012  *                           struct net_device *dev, u32 filter_mask,
1013  *                           int nlflags)
1014  * int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh,
1015  *                           u16 flags);
1016  *
1017  * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier);
1018  *      Called to change device carrier. Soft-devices (like dummy, team, etc)
1019  *      which do not represent real hardware may define this to allow their
1020  *      userspace components to manage their virtual carrier state. Devices
1021  *      that determine carrier state from physical hardware properties (eg
1022  *      network cables) or protocol-dependent mechanisms (eg
1023  *      USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function.
1024  *
1025  * int (*ndo_get_phys_port_id)(struct net_device *dev,
1026  *                             struct netdev_phys_item_id *ppid);
1027  *      Called to get ID of physical port of this device. If driver does
1028  *      not implement this, it is assumed that the hw is not able to have
1029  *      multiple net devices on single physical port.
1030  *
1031  * void (*ndo_add_vxlan_port)(struct  net_device *dev,
1032  *                            sa_family_t sa_family, __be16 port);
1033  *      Called by vxlan to notify a driver about the UDP port and socket
1034  *      address family that vxlan is listening to. It is called only when
1035  *      a new port starts listening. The operation is protected by the
1036  *      vxlan_net->sock_lock.
1037  *
1038  * void (*ndo_add_geneve_port)(struct net_device *dev,
1039  *                             sa_family_t sa_family, __be16 port);
1040  *      Called by geneve to notify a driver about the UDP port and socket
1041  *      address family that geneve is listnening to. It is called only when
1042  *      a new port starts listening. The operation is protected by the
1043  *      geneve_net->sock_lock.
1044  *
1045  * void (*ndo_del_geneve_port)(struct net_device *dev,
1046  *                             sa_family_t sa_family, __be16 port);
1047  *      Called by geneve to notify the driver about a UDP port and socket
1048  *      address family that geneve is not listening to anymore. The operation
1049  *      is protected by the geneve_net->sock_lock.
1050  *
1051  * void (*ndo_del_vxlan_port)(struct  net_device *dev,
1052  *                            sa_family_t sa_family, __be16 port);
1053  *      Called by vxlan to notify the driver about a UDP port and socket
1054  *      address family that vxlan is not listening to anymore. The operation
1055  *      is protected by the vxlan_net->sock_lock.
1056  *
1057  * void* (*ndo_dfwd_add_station)(struct net_device *pdev,
1058  *                               struct net_device *dev)
1059  *      Called by upper layer devices to accelerate switching or other
1060  *      station functionality into hardware. 'pdev is the lowerdev
1061  *      to use for the offload and 'dev' is the net device that will
1062  *      back the offload. Returns a pointer to the private structure
1063  *      the upper layer will maintain.
1064  * void (*ndo_dfwd_del_station)(struct net_device *pdev, void *priv)
1065  *      Called by upper layer device to delete the station created
1066  *      by 'ndo_dfwd_add_station'. 'pdev' is the net device backing
1067  *      the station and priv is the structure returned by the add
1068  *      operation.
1069  * netdev_tx_t (*ndo_dfwd_start_xmit)(struct sk_buff *skb,
1070  *                                    struct net_device *dev,
1071  *                                    void *priv);
1072  *      Callback to use for xmit over the accelerated station. This
1073  *      is used in place of ndo_start_xmit on accelerated net
1074  *      devices.
1075  * netdev_features_t (*ndo_features_check)(struct sk_buff *skb,
1076  *                                         struct net_device *dev
1077  *                                         netdev_features_t features);
1078  *      Called by core transmit path to determine if device is capable of
1079  *      performing offload operations on a given packet. This is to give
1080  *      the device an opportunity to implement any restrictions that cannot
1081  *      be otherwise expressed by feature flags. The check is called with
1082  *      the set of features that the stack has calculated and it returns
1083  *      those the driver believes to be appropriate.
1084  * int (*ndo_set_tx_maxrate)(struct net_device *dev,
1085  *                           int queue_index, u32 maxrate);
1086  *      Called when a user wants to set a max-rate limitation of specific
1087  *      TX queue.
1088  * int (*ndo_get_iflink)(const struct net_device *dev);
1089  *      Called to get the iflink value of this device.
1090  * void (*ndo_change_proto_down)(struct net_device *dev,
1091  *                               bool proto_down);
1092  *      This function is used to pass protocol port error state information
1093  *      to the switch driver. The switch driver can react to the proto_down
1094  *      by doing a phys down on the associated switch port.
1095  * int (*ndo_fill_metadata_dst)(struct net_device *dev, struct sk_buff *skb);
1096  *      This function is used to get egress tunnel information for given skb.
1097  *      This is useful for retrieving outer tunnel header parameters while
1098  *      sampling packet.
1099  * void (*ndo_set_rx_headroom)(struct net_device *dev, int needed_headroom);
1100  *      This function is used to specify the headroom that the skb must
1101  *      consider when allocation skb during packet reception. Setting
1102  *      appropriate rx headroom value allows avoiding skb head copy on
1103  *      forward. Setting a negative value resets the rx headroom to the
1104  *      default value.
1105  *
1106  */
1107 struct net_device_ops {
1108         int                     (*ndo_init)(struct net_device *dev);
1109         void                    (*ndo_uninit)(struct net_device *dev);
1110         int                     (*ndo_open)(struct net_device *dev);
1111         int                     (*ndo_stop)(struct net_device *dev);
1112         netdev_tx_t             (*ndo_start_xmit)(struct sk_buff *skb,
1113                                                   struct net_device *dev);
1114         netdev_features_t       (*ndo_features_check)(struct sk_buff *skb,
1115                                                       struct net_device *dev,
1116                                                       netdev_features_t features);
1117         u16                     (*ndo_select_queue)(struct net_device *dev,
1118                                                     struct sk_buff *skb,
1119                                                     void *accel_priv,
1120                                                     select_queue_fallback_t fallback);
1121         void                    (*ndo_change_rx_flags)(struct net_device *dev,
1122                                                        int flags);
1123         void                    (*ndo_set_rx_mode)(struct net_device *dev);
1124         int                     (*ndo_set_mac_address)(struct net_device *dev,
1125                                                        void *addr);
1126         int                     (*ndo_validate_addr)(struct net_device *dev);
1127         int                     (*ndo_do_ioctl)(struct net_device *dev,
1128                                                 struct ifreq *ifr, int cmd);
1129         int                     (*ndo_set_config)(struct net_device *dev,
1130                                                   struct ifmap *map);
1131         int                     (*ndo_change_mtu)(struct net_device *dev,
1132                                                   int new_mtu);
1133         int                     (*ndo_neigh_setup)(struct net_device *dev,
1134                                                    struct neigh_parms *);
1135         void                    (*ndo_tx_timeout) (struct net_device *dev);
1136 
1137         struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
1138                                                      struct rtnl_link_stats64 *storage);
1139         struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
1140 
1141         int                     (*ndo_vlan_rx_add_vid)(struct net_device *dev,
1142                                                        __be16 proto, u16 vid);
1143         int                     (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
1144                                                         __be16 proto, u16 vid);
1145 #ifdef CONFIG_NET_POLL_CONTROLLER
1146         void                    (*ndo_poll_controller)(struct net_device *dev);
1147         int                     (*ndo_netpoll_setup)(struct net_device *dev,
1148                                                      struct netpoll_info *info);
1149         void                    (*ndo_netpoll_cleanup)(struct net_device *dev);
1150 #endif
1151 #ifdef CONFIG_NET_RX_BUSY_POLL
1152         int                     (*ndo_busy_poll)(struct napi_struct *dev);
1153 #endif
1154         int                     (*ndo_set_vf_mac)(struct net_device *dev,
1155                                                   int queue, u8 *mac);
1156         int                     (*ndo_set_vf_vlan)(struct net_device *dev,
1157                                                    int queue, u16 vlan, u8 qos);
1158         int                     (*ndo_set_vf_rate)(struct net_device *dev,
1159                                                    int vf, int min_tx_rate,
1160                                                    int max_tx_rate);
1161         int                     (*ndo_set_vf_spoofchk)(struct net_device *dev,
1162                                                        int vf, bool setting);
1163         int                     (*ndo_set_vf_trust)(struct net_device *dev,
1164                                                     int vf, bool setting);
1165         int                     (*ndo_get_vf_config)(struct net_device *dev,
1166                                                      int vf,
1167                                                      struct ifla_vf_info *ivf);
1168         int                     (*ndo_set_vf_link_state)(struct net_device *dev,
1169                                                          int vf, int link_state);
1170         int                     (*ndo_get_vf_stats)(struct net_device *dev,
1171                                                     int vf,
1172                                                     struct ifla_vf_stats
1173                                                     *vf_stats);
1174         int                     (*ndo_set_vf_port)(struct net_device *dev,
1175                                                    int vf,
1176                                                    struct nlattr *port[]);
1177         int                     (*ndo_get_vf_port)(struct net_device *dev,
1178                                                    int vf, struct sk_buff *skb);
1179         int                     (*ndo_set_vf_guid)(struct net_device *dev,
1180                                                    int vf, u64 guid,
1181                                                    int guid_type);
1182         int                     (*ndo_set_vf_rss_query_en)(
1183                                                    struct net_device *dev,
1184                                                    int vf, bool setting);
1185         int                     (*ndo_setup_tc)(struct net_device *dev,
1186                                                 u32 handle,
1187                                                 __be16 protocol,
1188                                                 struct tc_to_netdev *tc);
1189 #if IS_ENABLED(CONFIG_FCOE)
1190         int                     (*ndo_fcoe_enable)(struct net_device *dev);
1191         int                     (*ndo_fcoe_disable)(struct net_device *dev);
1192         int                     (*ndo_fcoe_ddp_setup)(struct net_device *dev,
1193                                                       u16 xid,
1194                                                       struct scatterlist *sgl,
1195                                                       unsigned int sgc);
1196         int                     (*ndo_fcoe_ddp_done)(struct net_device *dev,
1197                                                      u16 xid);
1198         int                     (*ndo_fcoe_ddp_target)(struct net_device *dev,
1199                                                        u16 xid,
1200                                                        struct scatterlist *sgl,
1201                                                        unsigned int sgc);
1202         int                     (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
1203                                                         struct netdev_fcoe_hbainfo *hbainfo);
1204 #endif
1205 
1206 #if IS_ENABLED(CONFIG_LIBFCOE)
1207 #define NETDEV_FCOE_WWNN 0
1208 #define NETDEV_FCOE_WWPN 1
1209         int                     (*ndo_fcoe_get_wwn)(struct net_device *dev,
1210                                                     u64 *wwn, int type);
1211 #endif
1212 
1213 #ifdef CONFIG_RFS_ACCEL
1214         int                     (*ndo_rx_flow_steer)(struct net_device *dev,
1215                                                      const struct sk_buff *skb,
1216                                                      u16 rxq_index,
1217                                                      u32 flow_id);
1218 #endif
1219         int                     (*ndo_add_slave)(struct net_device *dev,
1220                                                  struct net_device *slave_dev);
1221         int                     (*ndo_del_slave)(struct net_device *dev,
1222                                                  struct net_device *slave_dev);
1223         netdev_features_t       (*ndo_fix_features)(struct net_device *dev,
1224                                                     netdev_features_t features);
1225         int                     (*ndo_set_features)(struct net_device *dev,
1226                                                     netdev_features_t features);
1227         int                     (*ndo_neigh_construct)(struct neighbour *n);
1228         void                    (*ndo_neigh_destroy)(struct neighbour *n);
1229 
1230         int                     (*ndo_fdb_add)(struct ndmsg *ndm,
1231                                                struct nlattr *tb[],
1232                                                struct net_device *dev,
1233                                                const unsigned char *addr,
1234                                                u16 vid,
1235                                                u16 flags);
1236         int                     (*ndo_fdb_del)(struct ndmsg *ndm,
1237                                                struct nlattr *tb[],
1238                                                struct net_device *dev,
1239                                                const unsigned char *addr,
1240                                                u16 vid);
1241         int                     (*ndo_fdb_dump)(struct sk_buff *skb,
1242                                                 struct netlink_callback *cb,
1243                                                 struct net_device *dev,
1244                                                 struct net_device *filter_dev,
1245                                                 int idx);
1246 
1247         int                     (*ndo_bridge_setlink)(struct net_device *dev,
1248                                                       struct nlmsghdr *nlh,
1249                                                       u16 flags);
1250         int                     (*ndo_bridge_getlink)(struct sk_buff *skb,
1251                                                       u32 pid, u32 seq,
1252                                                       struct net_device *dev,
1253                                                       u32 filter_mask,
1254                                                       int nlflags);
1255         int                     (*ndo_bridge_dellink)(struct net_device *dev,
1256                                                       struct nlmsghdr *nlh,
1257                                                       u16 flags);
1258         int                     (*ndo_change_carrier)(struct net_device *dev,
1259                                                       bool new_carrier);
1260         int                     (*ndo_get_phys_port_id)(struct net_device *dev,
1261                                                         struct netdev_phys_item_id *ppid);
1262         int                     (*ndo_get_phys_port_name)(struct net_device *dev,
1263                                                           char *name, size_t len);
1264         void                    (*ndo_add_vxlan_port)(struct  net_device *dev,
1265                                                       sa_family_t sa_family,
1266                                                       __be16 port);
1267         void                    (*ndo_del_vxlan_port)(struct  net_device *dev,
1268                                                       sa_family_t sa_family,
1269                                                       __be16 port);
1270         void                    (*ndo_add_geneve_port)(struct  net_device *dev,
1271                                                        sa_family_t sa_family,
1272                                                        __be16 port);
1273         void                    (*ndo_del_geneve_port)(struct  net_device *dev,
1274                                                        sa_family_t sa_family,
1275                                                        __be16 port);
1276         void*                   (*ndo_dfwd_add_station)(struct net_device *pdev,
1277                                                         struct net_device *dev);
1278         void                    (*ndo_dfwd_del_station)(struct net_device *pdev,
1279                                                         void *priv);
1280 
1281         netdev_tx_t             (*ndo_dfwd_start_xmit) (struct sk_buff *skb,
1282                                                         struct net_device *dev,
1283                                                         void *priv);
1284         int                     (*ndo_get_lock_subclass)(struct net_device *dev);
1285         int                     (*ndo_set_tx_maxrate)(struct net_device *dev,
1286                                                       int queue_index,
1287                                                       u32 maxrate);
1288         int                     (*ndo_get_iflink)(const struct net_device *dev);
1289         int                     (*ndo_change_proto_down)(struct net_device *dev,
1290                                                          bool proto_down);
1291         int                     (*ndo_fill_metadata_dst)(struct net_device *dev,
1292                                                        struct sk_buff *skb);
1293         void                    (*ndo_set_rx_headroom)(struct net_device *dev,
1294                                                        int needed_headroom);
1295 };
1296 
1297 /**
1298  * enum net_device_priv_flags - &struct net_device priv_flags
1299  *
1300  * These are the &struct net_device, they are only set internally
1301  * by drivers and used in the kernel. These flags are invisible to
1302  * userspace; this means that the order of these flags can change
1303  * during any kernel release.
1304  *
1305  * You should have a pretty good reason to be extending these flags.
1306  *
1307  * @IFF_802_1Q_VLAN: 802.1Q VLAN device
1308  * @IFF_EBRIDGE: Ethernet bridging device
1309  * @IFF_BONDING: bonding master or slave
1310  * @IFF_ISATAP: ISATAP interface (RFC4214)
1311  * @IFF_WAN_HDLC: WAN HDLC device
1312  * @IFF_XMIT_DST_RELEASE: dev_hard_start_xmit() is allowed to
1313  *      release skb->dst
1314  * @IFF_DONT_BRIDGE: disallow bridging this ether dev
1315  * @IFF_DISABLE_NETPOLL: disable netpoll at run-time
1316  * @IFF_MACVLAN_PORT: device used as macvlan port
1317  * @IFF_BRIDGE_PORT: device used as bridge port
1318  * @IFF_OVS_DATAPATH: device used as Open vSwitch datapath port
1319  * @IFF_TX_SKB_SHARING: The interface supports sharing skbs on transmit
1320  * @IFF_UNICAST_FLT: Supports unicast filtering
1321  * @IFF_TEAM_PORT: device used as team port
1322  * @IFF_SUPP_NOFCS: device supports sending custom FCS
1323  * @IFF_LIVE_ADDR_CHANGE: device supports hardware address
1324  *      change when it's running
1325  * @IFF_MACVLAN: Macvlan device
1326  * @IFF_XMIT_DST_RELEASE_PERM: IFF_XMIT_DST_RELEASE not taking into account
1327  *      underlying stacked devices
1328  * @IFF_IPVLAN_MASTER: IPvlan master device
1329  * @IFF_IPVLAN_SLAVE: IPvlan slave device
1330  * @IFF_L3MDEV_MASTER: device is an L3 master device
1331  * @IFF_NO_QUEUE: device can run without qdisc attached
1332  * @IFF_OPENVSWITCH: device is a Open vSwitch master
1333  * @IFF_L3MDEV_SLAVE: device is enslaved to an L3 master device
1334  * @IFF_TEAM: device is a team device
1335  * @IFF_RXFH_CONFIGURED: device has had Rx Flow indirection table configured
1336  * @IFF_PHONY_HEADROOM: the headroom value is controlled by an external
1337  *      entity (i.e. the master device for bridged veth)
1338  * @IFF_MACSEC: device is a MACsec device
1339  */
1340 enum netdev_priv_flags {
1341         IFF_802_1Q_VLAN                 = 1<<0,
1342         IFF_EBRIDGE                     = 1<<1,
1343         IFF_BONDING                     = 1<<2,
1344         IFF_ISATAP                      = 1<<3,
1345         IFF_WAN_HDLC                    = 1<<4,
1346         IFF_XMIT_DST_RELEASE            = 1<<5,
1347         IFF_DONT_BRIDGE                 = 1<<6,
1348         IFF_DISABLE_NETPOLL             = 1<<7,
1349         IFF_MACVLAN_PORT                = 1<<8,
1350         IFF_BRIDGE_PORT                 = 1<<9,
1351         IFF_OVS_DATAPATH                = 1<<10,
1352         IFF_TX_SKB_SHARING              = 1<<11,
1353         IFF_UNICAST_FLT                 = 1<<12,
1354         IFF_TEAM_PORT                   = 1<<13,
1355         IFF_SUPP_NOFCS                  = 1<<14,
1356         IFF_LIVE_ADDR_CHANGE            = 1<<15,
1357         IFF_MACVLAN                     = 1<<16,
1358         IFF_XMIT_DST_RELEASE_PERM       = 1<<17,
1359         IFF_IPVLAN_MASTER               = 1<<18,
1360         IFF_IPVLAN_SLAVE                = 1<<19,
1361         IFF_L3MDEV_MASTER               = 1<<20,
1362         IFF_NO_QUEUE                    = 1<<21,
1363         IFF_OPENVSWITCH                 = 1<<22,
1364         IFF_L3MDEV_SLAVE                = 1<<23,
1365         IFF_TEAM                        = 1<<24,
1366         IFF_RXFH_CONFIGURED             = 1<<25,
1367         IFF_PHONY_HEADROOM              = 1<<26,
1368         IFF_MACSEC                      = 1<<27,
1369 };
1370 
1371 #define IFF_802_1Q_VLAN                 IFF_802_1Q_VLAN
1372 #define IFF_EBRIDGE                     IFF_EBRIDGE
1373 #define IFF_BONDING                     IFF_BONDING
1374 #define IFF_ISATAP                      IFF_ISATAP
1375 #define IFF_WAN_HDLC                    IFF_WAN_HDLC
1376 #define IFF_XMIT_DST_RELEASE            IFF_XMIT_DST_RELEASE
1377 #define IFF_DONT_BRIDGE                 IFF_DONT_BRIDGE
1378 #define IFF_DISABLE_NETPOLL             IFF_DISABLE_NETPOLL
1379 #define IFF_MACVLAN_PORT                IFF_MACVLAN_PORT
1380 #define IFF_BRIDGE_PORT                 IFF_BRIDGE_PORT
1381 #define IFF_OVS_DATAPATH                IFF_OVS_DATAPATH
1382 #define IFF_TX_SKB_SHARING              IFF_TX_SKB_SHARING
1383 #define IFF_UNICAST_FLT                 IFF_UNICAST_FLT
1384 #define IFF_TEAM_PORT                   IFF_TEAM_PORT
1385 #define IFF_SUPP_NOFCS                  IFF_SUPP_NOFCS
1386 #define IFF_LIVE_ADDR_CHANGE            IFF_LIVE_ADDR_CHANGE
1387 #define IFF_MACVLAN                     IFF_MACVLAN
1388 #define IFF_XMIT_DST_RELEASE_PERM       IFF_XMIT_DST_RELEASE_PERM
1389 #define IFF_IPVLAN_MASTER               IFF_IPVLAN_MASTER
1390 #define IFF_IPVLAN_SLAVE                IFF_IPVLAN_SLAVE
1391 #define IFF_L3MDEV_MASTER               IFF_L3MDEV_MASTER
1392 #define IFF_NO_QUEUE                    IFF_NO_QUEUE
1393 #define IFF_OPENVSWITCH                 IFF_OPENVSWITCH
1394 #define IFF_L3MDEV_SLAVE                IFF_L3MDEV_SLAVE
1395 #define IFF_TEAM                        IFF_TEAM
1396 #define IFF_RXFH_CONFIGURED             IFF_RXFH_CONFIGURED
1397 #define IFF_MACSEC                      IFF_MACSEC
1398 
1399 /**
1400  *      struct net_device - The DEVICE structure.
1401  *              Actually, this whole structure is a big mistake.  It mixes I/O
1402  *              data with strictly "high-level" data, and it has to know about
1403  *              almost every data structure used in the INET module.
1404  *
1405  *      @name:  This is the first field of the "visible" part of this structure
1406  *              (i.e. as seen by users in the "Space.c" file).  It is the name
1407  *              of the interface.
1408  *
1409  *      @name_hlist:    Device name hash chain, please keep it close to name[]
1410  *      @ifalias:       SNMP alias
1411  *      @mem_end:       Shared memory end
1412  *      @mem_start:     Shared memory start
1413  *      @base_addr:     Device I/O address
1414  *      @irq:           Device IRQ number
1415  *
1416  *      @carrier_changes:       Stats to monitor carrier on<->off transitions
1417  *
1418  *      @state:         Generic network queuing layer state, see netdev_state_t
1419  *      @dev_list:      The global list of network devices
1420  *      @napi_list:     List entry used for polling NAPI devices
1421  *      @unreg_list:    List entry  when we are unregistering the
1422  *                      device; see the function unregister_netdev
1423  *      @close_list:    List entry used when we are closing the device
1424  *      @ptype_all:     Device-specific packet handlers for all protocols
1425  *      @ptype_specific: Device-specific, protocol-specific packet handlers
1426  *
1427  *      @adj_list:      Directly linked devices, like slaves for bonding
1428  *      @all_adj_list:  All linked devices, *including* neighbours
1429  *      @features:      Currently active device features
1430  *      @hw_features:   User-changeable features
1431  *
1432  *      @wanted_features:       User-requested features
1433  *      @vlan_features:         Mask of features inheritable by VLAN devices
1434  *
1435  *      @hw_enc_features:       Mask of features inherited by encapsulating devices
1436  *                              This field indicates what encapsulation
1437  *                              offloads the hardware is capable of doing,
1438  *                              and drivers will need to set them appropriately.
1439  *
1440  *      @mpls_features: Mask of features inheritable by MPLS
1441  *
1442  *      @ifindex:       interface index
1443  *      @group:         The group the device belongs to
1444  *
1445  *      @stats:         Statistics struct, which was left as a legacy, use
1446  *                      rtnl_link_stats64 instead
1447  *
1448  *      @rx_dropped:    Dropped packets by core network,
1449  *                      do not use this in drivers
1450  *      @tx_dropped:    Dropped packets by core network,
1451  *                      do not use this in drivers
1452  *      @rx_nohandler:  nohandler dropped packets by core network on
1453  *                      inactive devices, do not use this in drivers
1454  *
1455  *      @wireless_handlers:     List of functions to handle Wireless Extensions,
1456  *                              instead of ioctl,
1457  *                              see <net/iw_handler.h> for details.
1458  *      @wireless_data: Instance data managed by the core of wireless extensions
1459  *
1460  *      @netdev_ops:    Includes several pointers to callbacks,
1461  *                      if one wants to override the ndo_*() functions
1462  *      @ethtool_ops:   Management operations
1463  *      @header_ops:    Includes callbacks for creating,parsing,caching,etc
1464  *                      of Layer 2 headers.
1465  *
1466  *      @flags:         Interface flags (a la BSD)
1467  *      @priv_flags:    Like 'flags' but invisible to userspace,
1468  *                      see if.h for the definitions
1469  *      @gflags:        Global flags ( kept as legacy )
1470  *      @padded:        How much padding added by alloc_netdev()
1471  *      @operstate:     RFC2863 operstate
1472  *      @link_mode:     Mapping policy to operstate
1473  *      @if_port:       Selectable AUI, TP, ...
1474  *      @dma:           DMA channel
1475  *      @mtu:           Interface MTU value
1476  *      @type:          Interface hardware type
1477  *      @hard_header_len: Maximum hardware header length.
1478  *
1479  *      @needed_headroom: Extra headroom the hardware may need, but not in all
1480  *                        cases can this be guaranteed
1481  *      @needed_tailroom: Extra tailroom the hardware may need, but not in all
1482  *                        cases can this be guaranteed. Some cases also use
1483  *                        LL_MAX_HEADER instead to allocate the skb
1484  *
1485  *      interface address info:
1486  *
1487  *      @perm_addr:             Permanent hw address
1488  *      @addr_assign_type:      Hw address assignment type
1489  *      @addr_len:              Hardware address length
1490  *      @neigh_priv_len;        Used in neigh_alloc(),
1491  *                              initialized only in atm/clip.c
1492  *      @dev_id:                Used to differentiate devices that share
1493  *                              the same link layer address
1494  *      @dev_port:              Used to differentiate devices that share
1495  *                              the same function
1496  *      @addr_list_lock:        XXX: need comments on this one
1497  *      @uc_promisc:            Counter that indicates promiscuous mode
1498  *                              has been enabled due to the need to listen to
1499  *                              additional unicast addresses in a device that
1500  *                              does not implement ndo_set_rx_mode()
1501  *      @uc:                    unicast mac addresses
1502  *      @mc:                    multicast mac addresses
1503  *      @dev_addrs:             list of device hw addresses
1504  *      @queues_kset:           Group of all Kobjects in the Tx and RX queues
1505  *      @promiscuity:           Number of times the NIC is told to work in
1506  *                              promiscuous mode; if it becomes 0 the NIC will
1507  *                              exit promiscuous mode
1508  *      @allmulti:              Counter, enables or disables allmulticast mode
1509  *
1510  *      @vlan_info:     VLAN info
1511  *      @dsa_ptr:       dsa specific data
1512  *      @tipc_ptr:      TIPC specific data
1513  *      @atalk_ptr:     AppleTalk link
1514  *      @ip_ptr:        IPv4 specific data
1515  *      @dn_ptr:        DECnet specific data
1516  *      @ip6_ptr:       IPv6 specific data
1517  *      @ax25_ptr:      AX.25 specific data
1518  *      @ieee80211_ptr: IEEE 802.11 specific data, assign before registering
1519  *
1520  *      @last_rx:       Time of last Rx
1521  *      @dev_addr:      Hw address (before bcast,
1522  *                      because most packets are unicast)
1523  *
1524  *      @_rx:                   Array of RX queues
1525  *      @num_rx_queues:         Number of RX queues
1526  *                              allocated at register_netdev() time
1527  *      @real_num_rx_queues:    Number of RX queues currently active in device
1528  *
1529  *      @rx_handler:            handler for received packets
1530  *      @rx_handler_data:       XXX: need comments on this one
1531  *      @ingress_queue:         XXX: need comments on this one
1532  *      @broadcast:             hw bcast address
1533  *
1534  *      @rx_cpu_rmap:   CPU reverse-mapping for RX completion interrupts,
1535  *                      indexed by RX queue number. Assigned by driver.
1536  *                      This must only be set if the ndo_rx_flow_steer
1537  *                      operation is defined
1538  *      @index_hlist:           Device index hash chain
1539  *
1540  *      @_tx:                   Array of TX queues
1541  *      @num_tx_queues:         Number of TX queues allocated at alloc_netdev_mq() time
1542  *      @real_num_tx_queues:    Number of TX queues currently active in device
1543  *      @qdisc:                 Root qdisc from userspace point of view
1544  *      @tx_queue_len:          Max frames per queue allowed
1545  *      @tx_global_lock:        XXX: need comments on this one
1546  *
1547  *      @xps_maps:      XXX: need comments on this one
1548  *
1549  *      @offload_fwd_mark:      Offload device fwding mark
1550  *
1551  *      @trans_start:           Time (in jiffies) of last Tx
1552  *      @watchdog_timeo:        Represents the timeout that is used by
1553  *                              the watchdog (see dev_watchdog())
1554  *      @watchdog_timer:        List of timers
1555  *
1556  *      @pcpu_refcnt:           Number of references to this device
1557  *      @todo_list:             Delayed register/unregister
1558  *      @link_watch_list:       XXX: need comments on this one
1559  *
1560  *      @reg_state:             Register/unregister state machine
1561  *      @dismantle:             Device is going to be freed
1562  *      @rtnl_link_state:       This enum represents the phases of creating
1563  *                              a new link
1564  *
1565  *      @destructor:            Called from unregister,
1566  *                              can be used to call free_netdev
1567  *      @npinfo:                XXX: need comments on this one
1568  *      @nd_net:                Network namespace this network device is inside
1569  *
1570  *      @ml_priv:       Mid-layer private
1571  *      @lstats:        Loopback statistics
1572  *      @tstats:        Tunnel statistics
1573  *      @dstats:        Dummy statistics
1574  *      @vstats:        Virtual ethernet statistics
1575  *
1576  *      @garp_port:     GARP
1577  *      @mrp_port:      MRP
1578  *
1579  *      @dev:           Class/net/name entry
1580  *      @sysfs_groups:  Space for optional device, statistics and wireless
1581  *                      sysfs groups
1582  *
1583  *      @sysfs_rx_queue_group:  Space for optional per-rx queue attributes
1584  *      @rtnl_link_ops: Rtnl_link_ops
1585  *
1586  *      @gso_max_size:  Maximum size of generic segmentation offload
1587  *      @gso_max_segs:  Maximum number of segments that can be passed to the
1588  *                      NIC for GSO
1589  *      @gso_min_segs:  Minimum number of segments that can be passed to the
1590  *                      NIC for GSO
1591  *
1592  *      @dcbnl_ops:     Data Center Bridging netlink ops
1593  *      @num_tc:        Number of traffic classes in the net device
1594  *      @tc_to_txq:     XXX: need comments on this one
1595  *      @prio_tc_map    XXX: need comments on this one
1596  *
1597  *      @fcoe_ddp_xid:  Max exchange id for FCoE LRO by ddp
1598  *
1599  *      @priomap:       XXX: need comments on this one
1600  *      @phydev:        Physical device may attach itself
1601  *                      for hardware timestamping
1602  *
1603  *      @qdisc_tx_busylock:     XXX: need comments on this one
1604  *
1605  *      @proto_down:    protocol port state information can be sent to the
1606  *                      switch driver and used to set the phys state of the
1607  *                      switch port.
1608  *
1609  *      FIXME: cleanup struct net_device such that network protocol info
1610  *      moves out.
1611  */
1612 
1613 struct net_device {
1614         char                    name[IFNAMSIZ];
1615         struct hlist_node       name_hlist;
1616         char                    *ifalias;
1617         /*
1618          *      I/O specific fields
1619          *      FIXME: Merge these and struct ifmap into one
1620          */
1621         unsigned long           mem_end;
1622         unsigned long           mem_start;
1623         unsigned long           base_addr;
1624         int                     irq;
1625 
1626         atomic_t                carrier_changes;
1627 
1628         /*
1629          *      Some hardware also needs these fields (state,dev_list,
1630          *      napi_list,unreg_list,close_list) but they are not
1631          *      part of the usual set specified in Space.c.
1632          */
1633 
1634         unsigned long           state;
1635 
1636         struct list_head        dev_list;
1637         struct list_head        napi_list;
1638         struct list_head        unreg_list;
1639         struct list_head        close_list;
1640         struct list_head        ptype_all;
1641         struct list_head        ptype_specific;
1642 
1643         struct {
1644                 struct list_head upper;
1645                 struct list_head lower;
1646         } adj_list;
1647 
1648         struct {
1649                 struct list_head upper;
1650                 struct list_head lower;
1651         } all_adj_list;
1652 
1653         netdev_features_t       features;
1654         netdev_features_t       hw_features;
1655         netdev_features_t       wanted_features;
1656         netdev_features_t       vlan_features;
1657         netdev_features_t       hw_enc_features;
1658         netdev_features_t       mpls_features;
1659 
1660         int                     ifindex;
1661         int                     group;
1662 
1663         struct net_device_stats stats;
1664 
1665         atomic_long_t           rx_dropped;
1666         atomic_long_t           tx_dropped;
1667         atomic_long_t           rx_nohandler;
1668 
1669 #ifdef CONFIG_WIRELESS_EXT
1670         const struct iw_handler_def *wireless_handlers;
1671         struct iw_public_data   *wireless_data;
1672 #endif
1673         const struct net_device_ops *netdev_ops;
1674         const struct ethtool_ops *ethtool_ops;
1675 #ifdef CONFIG_NET_SWITCHDEV
1676         const struct switchdev_ops *switchdev_ops;
1677 #endif
1678 #ifdef CONFIG_NET_L3_MASTER_DEV
1679         const struct l3mdev_ops *l3mdev_ops;
1680 #endif
1681 
1682         const struct header_ops *header_ops;
1683 
1684         unsigned int            flags;
1685         unsigned int            priv_flags;
1686 
1687         unsigned short          gflags;
1688         unsigned short          padded;
1689 
1690         unsigned char           operstate;
1691         unsigned char           link_mode;
1692 
1693         unsigned char           if_port;
1694         unsigned char           dma;
1695 
1696         unsigned int            mtu;
1697         unsigned short          type;
1698         unsigned short          hard_header_len;
1699 
1700         unsigned short          needed_headroom;
1701         unsigned short          needed_tailroom;
1702 
1703         /* Interface address info. */
1704         unsigned char           perm_addr[MAX_ADDR_LEN];
1705         unsigned char           addr_assign_type;
1706         unsigned char           addr_len;
1707         unsigned short          neigh_priv_len;
1708         unsigned short          dev_id;
1709         unsigned short          dev_port;
1710         spinlock_t              addr_list_lock;
1711         unsigned char           name_assign_type;
1712         bool                    uc_promisc;
1713         struct netdev_hw_addr_list      uc;
1714         struct netdev_hw_addr_list      mc;
1715         struct netdev_hw_addr_list      dev_addrs;
1716 
1717 #ifdef CONFIG_SYSFS
1718         struct kset             *queues_kset;
1719 #endif
1720         unsigned int            promiscuity;
1721         unsigned int            allmulti;
1722 
1723 
1724         /* Protocol-specific pointers */
1725 
1726 #if IS_ENABLED(CONFIG_VLAN_8021Q)
1727         struct vlan_info __rcu  *vlan_info;
1728 #endif
1729 #if IS_ENABLED(CONFIG_NET_DSA)
1730         struct dsa_switch_tree  *dsa_ptr;
1731 #endif
1732 #if IS_ENABLED(CONFIG_TIPC)
1733         struct tipc_bearer __rcu *tipc_ptr;
1734 #endif
1735         void                    *atalk_ptr;
1736         struct in_device __rcu  *ip_ptr;
1737         struct dn_dev __rcu     *dn_ptr;
1738         struct inet6_dev __rcu  *ip6_ptr;
1739         void                    *ax25_ptr;
1740         struct wireless_dev     *ieee80211_ptr;
1741         struct wpan_dev         *ieee802154_ptr;
1742 #if IS_ENABLED(CONFIG_MPLS_ROUTING)
1743         struct mpls_dev __rcu   *mpls_ptr;
1744 #endif
1745 
1746 /*
1747  * Cache lines mostly used on receive path (including eth_type_trans())
1748  */
1749         unsigned long           last_rx;
1750 
1751         /* Interface address info used in eth_type_trans() */
1752         unsigned char           *dev_addr;
1753 
1754 #ifdef CONFIG_SYSFS
1755         struct netdev_rx_queue  *_rx;
1756 
1757         unsigned int            num_rx_queues;
1758         unsigned int            real_num_rx_queues;
1759 #endif
1760 
1761         unsigned long           gro_flush_timeout;
1762         rx_handler_func_t __rcu *rx_handler;
1763         void __rcu              *rx_handler_data;
1764 
1765 #ifdef CONFIG_NET_CLS_ACT
1766         struct tcf_proto __rcu  *ingress_cl_list;
1767 #endif
1768         struct netdev_queue __rcu *ingress_queue;
1769 #ifdef CONFIG_NETFILTER_INGRESS
1770         struct list_head        nf_hooks_ingress;
1771 #endif
1772 
1773         unsigned char           broadcast[MAX_ADDR_LEN];
1774 #ifdef CONFIG_RFS_ACCEL
1775         struct cpu_rmap         *rx_cpu_rmap;
1776 #endif
1777         struct hlist_node       index_hlist;
1778 
1779 /*
1780  * Cache lines mostly used on transmit path
1781  */
1782         struct netdev_queue     *_tx ____cacheline_aligned_in_smp;
1783         unsigned int            num_tx_queues;
1784         unsigned int            real_num_tx_queues;
1785         struct Qdisc            *qdisc;
1786         unsigned long           tx_queue_len;
1787         spinlock_t              tx_global_lock;
1788         int                     watchdog_timeo;
1789 
1790 #ifdef CONFIG_XPS
1791         struct xps_dev_maps __rcu *xps_maps;
1792 #endif
1793 #ifdef CONFIG_NET_CLS_ACT
1794         struct tcf_proto __rcu  *egress_cl_list;
1795 #endif
1796 #ifdef CONFIG_NET_SWITCHDEV
1797         u32                     offload_fwd_mark;
1798 #endif
1799 
1800         /* These may be needed for future network-power-down code. */
1801 
1802         /*
1803          * trans_start here is expensive for high speed devices on SMP,
1804          * please use netdev_queue->trans_start instead.
1805          */
1806         unsigned long           trans_start;
1807 
1808         struct timer_list       watchdog_timer;
1809 
1810         int __percpu            *pcpu_refcnt;
1811         struct list_head        todo_list;
1812 
1813         struct list_head        link_watch_list;
1814 
1815         enum { NETREG_UNINITIALIZED=0,
1816                NETREG_REGISTERED,       /* completed register_netdevice */
1817                NETREG_UNREGISTERING,    /* called unregister_netdevice */
1818                NETREG_UNREGISTERED,     /* completed unregister todo */
1819                NETREG_RELEASED,         /* called free_netdev */
1820                NETREG_DUMMY,            /* dummy device for NAPI poll */
1821         } reg_state:8;
1822 
1823         bool dismantle;
1824 
1825         enum {
1826                 RTNL_LINK_INITIALIZED,
1827                 RTNL_LINK_INITIALIZING,
1828         } rtnl_link_state:16;
1829 
1830         void (*destructor)(struct net_device *dev);
1831 
1832 #ifdef CONFIG_NETPOLL
1833         struct netpoll_info __rcu       *npinfo;
1834 #endif
1835 
1836         possible_net_t                  nd_net;
1837 
1838         /* mid-layer private */
1839         union {
1840                 void                                    *ml_priv;
1841                 struct pcpu_lstats __percpu             *lstats;
1842                 struct pcpu_sw_netstats __percpu        *tstats;
1843                 struct pcpu_dstats __percpu             *dstats;
1844                 struct pcpu_vstats __percpu             *vstats;
1845         };
1846 
1847         struct garp_port __rcu  *garp_port;
1848         struct mrp_port __rcu   *mrp_port;
1849 
1850         struct device           dev;
1851         const struct attribute_group *sysfs_groups[4];
1852         const struct attribute_group *sysfs_rx_queue_group;
1853 
1854         const struct rtnl_link_ops *rtnl_link_ops;
1855 
1856         /* for setting kernel sock attribute on TCP connection setup */
1857 #define GSO_MAX_SIZE            65536
1858         unsigned int            gso_max_size;
1859 #define GSO_MAX_SEGS            65535
1860         u16                     gso_max_segs;
1861         u16                     gso_min_segs;
1862 #ifdef CONFIG_DCB
1863         const struct dcbnl_rtnl_ops *dcbnl_ops;
1864 #endif
1865         u8                      num_tc;
1866         struct netdev_tc_txq    tc_to_txq[TC_MAX_QUEUE];
1867         u8                      prio_tc_map[TC_BITMASK + 1];
1868 
1869 #if IS_ENABLED(CONFIG_FCOE)
1870         unsigned int            fcoe_ddp_xid;
1871 #endif
1872 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
1873         struct netprio_map __rcu *priomap;
1874 #endif
1875         struct phy_device       *phydev;
1876         struct lock_class_key   *qdisc_tx_busylock;
1877         bool                    proto_down;
1878 };
1879 #define to_net_dev(d) container_of(d, struct net_device, dev)
1880 
1881 #define NETDEV_ALIGN            32
1882 
1883 static inline
1884 int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
1885 {
1886         return dev->prio_tc_map[prio & TC_BITMASK];
1887 }
1888 
1889 static inline
1890 int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc)
1891 {
1892         if (tc >= dev->num_tc)
1893                 return -EINVAL;
1894 
1895         dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK;
1896         return 0;
1897 }
1898 
1899 static inline
1900 void netdev_reset_tc(struct net_device *dev)
1901 {
1902         dev->num_tc = 0;
1903         memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
1904         memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
1905 }
1906 
1907 static inline
1908 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
1909 {
1910         if (tc >= dev->num_tc)
1911                 return -EINVAL;
1912 
1913         dev->tc_to_txq[tc].count = count;
1914         dev->tc_to_txq[tc].offset = offset;
1915         return 0;
1916 }
1917 
1918 static inline
1919 int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
1920 {
1921         if (num_tc > TC_MAX_QUEUE)
1922                 return -EINVAL;
1923 
1924         dev->num_tc = num_tc;
1925         return 0;
1926 }
1927 
1928 static inline
1929 int netdev_get_num_tc(struct net_device *dev)
1930 {
1931         return dev->num_tc;
1932 }
1933 
1934 static inline
1935 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
1936                                          unsigned int index)
1937 {
1938         return &dev->_tx[index];
1939 }
1940 
1941 static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev,
1942                                                     const struct sk_buff *skb)
1943 {
1944         return netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
1945 }
1946 
1947 static inline void netdev_for_each_tx_queue(struct net_device *dev,
1948                                             void (*f)(struct net_device *,
1949                                                       struct netdev_queue *,
1950                                                       void *),
1951                                             void *arg)
1952 {
1953         unsigned int i;
1954 
1955         for (i = 0; i < dev->num_tx_queues; i++)
1956                 f(dev, &dev->_tx[i], arg);
1957 }
1958 
1959 struct netdev_queue *netdev_pick_tx(struct net_device *dev,
1960                                     struct sk_buff *skb,
1961                                     void *accel_priv);
1962 
1963 /* returns the headroom that the master device needs to take in account
1964  * when forwarding to this dev
1965  */
1966 static inline unsigned netdev_get_fwd_headroom(struct net_device *dev)
1967 {
1968         return dev->priv_flags & IFF_PHONY_HEADROOM ? 0 : dev->needed_headroom;
1969 }
1970 
1971 static inline void netdev_set_rx_headroom(struct net_device *dev, int new_hr)
1972 {
1973         if (dev->netdev_ops->ndo_set_rx_headroom)
1974                 dev->netdev_ops->ndo_set_rx_headroom(dev, new_hr);
1975 }
1976 
1977 /* set the device rx headroom to the dev's default */
1978 static inline void netdev_reset_rx_headroom(struct net_device *dev)
1979 {
1980         netdev_set_rx_headroom(dev, -1);
1981 }
1982 
1983 /*
1984  * Net namespace inlines
1985  */
1986 static inline
1987 struct net *dev_net(const struct net_device *dev)
1988 {
1989         return read_pnet(&dev->nd_net);
1990 }
1991 
1992 static inline
1993 void dev_net_set(struct net_device *dev, struct net *net)
1994 {
1995         write_pnet(&dev->nd_net, net);
1996 }
1997 
1998 static inline bool netdev_uses_dsa(struct net_device *dev)
1999 {
2000 #if IS_ENABLED(CONFIG_NET_DSA)
2001         if (dev->dsa_ptr != NULL)
2002                 return dsa_uses_tagged_protocol(dev->dsa_ptr);
2003 #endif
2004         return false;
2005 }
2006 
2007 /**
2008  *      netdev_priv - access network device private data
2009  *      @dev: network device
2010  *
2011  * Get network device private data
2012  */
2013 static inline void *netdev_priv(const struct net_device *dev)
2014 {
2015         return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
2016 }
2017 
2018 /* Set the sysfs physical device reference for the network logical device
2019  * if set prior to registration will cause a symlink during initialization.
2020  */
2021 #define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))
2022 
2023 /* Set the sysfs device type for the network logical device to allow
2024  * fine-grained identification of different network device types. For
2025  * example Ethernet, Wireless LAN, Bluetooth, WiMAX etc.
2026  */
2027 #define SET_NETDEV_DEVTYPE(net, devtype)        ((net)->dev.type = (devtype))
2028 
2029 /* Default NAPI poll() weight
2030  * Device drivers are strongly advised to not use bigger value
2031  */
2032 #define NAPI_POLL_WEIGHT 64
2033 
2034 /**
2035  *      netif_napi_add - initialize a NAPI context
2036  *      @dev:  network device
2037  *      @napi: NAPI context
2038  *      @poll: polling function
2039  *      @weight: default weight
2040  *
2041  * netif_napi_add() must be used to initialize a NAPI context prior to calling
2042  * *any* of the other NAPI-related functions.
2043  */
2044 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
2045                     int (*poll)(struct napi_struct *, int), int weight);
2046 
2047 /**
2048  *      netif_tx_napi_add - initialize a NAPI context
2049  *      @dev:  network device
2050  *      @napi: NAPI context
2051  *      @poll: polling function
2052  *      @weight: default weight
2053  *
2054  * This variant of netif_napi_add() should be used from drivers using NAPI
2055  * to exclusively poll a TX queue.
2056  * This will avoid we add it into napi_hash[], thus polluting this hash table.
2057  */
2058 static inline void netif_tx_napi_add(struct net_device *dev,
2059                                      struct napi_struct *napi,
2060                                      int (*poll)(struct napi_struct *, int),
2061                                      int weight)
2062 {
2063         set_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state);
2064         netif_napi_add(dev, napi, poll, weight);
2065 }
2066 
2067 /**
2068  *  netif_napi_del - remove a NAPI context
2069  *  @napi: NAPI context
2070  *
2071  *  netif_napi_del() removes a NAPI context from the network device NAPI list
2072  */
2073 void netif_napi_del(struct napi_struct *napi);
2074 
2075 struct napi_gro_cb {
2076         /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
2077         void    *frag0;
2078 
2079         /* Length of frag0. */
2080         unsigned int frag0_len;
2081 
2082         /* This indicates where we are processing relative to skb->data. */
2083         int     data_offset;
2084 
2085         /* This is non-zero if the packet cannot be merged with the new skb. */
2086         u16     flush;
2087 
2088         /* Save the IP ID here and check when we get to the transport layer */
2089         u16     flush_id;
2090 
2091         /* Number of segments aggregated. */
2092         u16     count;
2093 
2094         /* Start offset for remote checksum offload */
2095         u16     gro_remcsum_start;
2096 
2097         /* jiffies when first packet was created/queued */
2098         unsigned long age;
2099 
2100         /* Used in ipv6_gro_receive() and foo-over-udp */
2101         u16     proto;
2102 
2103         /* This is non-zero if the packet may be of the same flow. */
2104         u8      same_flow:1;
2105 
2106         /* Used in tunnel GRO receive */
2107         u8      encap_mark:1;
2108 
2109         /* GRO checksum is valid */
2110         u8      csum_valid:1;
2111 
2112         /* Number of checksums via CHECKSUM_UNNECESSARY */
2113         u8      csum_cnt:3;
2114 
2115         /* Free the skb? */
2116         u8      free:2;
2117 #define NAPI_GRO_FREE             1
2118 #define NAPI_GRO_FREE_STOLEN_HEAD 2
2119 
2120         /* Used in foo-over-udp, set in udp[46]_gro_receive */
2121         u8      is_ipv6:1;
2122 
2123         /* Used in GRE, set in fou/gue_gro_receive */
2124         u8      is_fou:1;
2125 
2126         /* 6 bit hole */
2127 
2128         /* used to support CHECKSUM_COMPLETE for tunneling protocols */
2129         __wsum  csum;
2130 
2131         /* used in skb_gro_receive() slow path */
2132         struct sk_buff *last;
2133 };
2134 
2135 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
2136 
2137 struct packet_type {
2138         __be16                  type;   /* This is really htons(ether_type). */
2139         struct net_device       *dev;   /* NULL is wildcarded here           */
2140         int                     (*func) (struct sk_buff *,
2141                                          struct net_device *,
2142                                          struct packet_type *,
2143                                          struct net_device *);
2144         bool                    (*id_match)(struct packet_type *ptype,
2145                                             struct sock *sk);
2146         void                    *af_packet_priv;
2147         struct list_head        list;
2148 };
2149 
2150 struct offload_callbacks {
2151         struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
2152                                                 netdev_features_t features);
2153         struct sk_buff          **(*gro_receive)(struct sk_buff **head,
2154                                                  struct sk_buff *skb);
2155         int                     (*gro_complete)(struct sk_buff *skb, int nhoff);
2156 };
2157 
2158 struct packet_offload {
2159         __be16                   type;  /* This is really htons(ether_type). */
2160         u16                      priority;
2161         struct offload_callbacks callbacks;
2162         struct list_head         list;
2163 };
2164 
2165 struct udp_offload;
2166 
2167 /* 'skb->encapsulation' is set before gro_complete() is called.  gro_complete()
2168  * must set 'skb->inner_mac_header' to the beginning of tunnel payload.
2169  */
2170 struct udp_offload_callbacks {
2171         struct sk_buff          **(*gro_receive)(struct sk_buff **head,
2172                                                  struct sk_buff *skb,
2173                                                  struct udp_offload *uoff);
2174         int                     (*gro_complete)(struct sk_buff *skb,
2175                                                 int nhoff,
2176                                                 struct udp_offload *uoff);
2177 };
2178 
2179 struct udp_offload {
2180         __be16                   port;
2181         u8                       ipproto;
2182         struct udp_offload_callbacks callbacks;
2183 };
2184 
2185 /* often modified stats are per-CPU, other are shared (netdev->stats) */
2186 struct pcpu_sw_netstats {
2187         u64     rx_packets;
2188         u64     rx_bytes;
2189         u64     tx_packets;
2190         u64     tx_bytes;
2191         struct u64_stats_sync   syncp;
2192 };
2193 
2194 #define __netdev_alloc_pcpu_stats(type, gfp)                            \
2195 ({                                                                      \
2196         typeof(type) __percpu *pcpu_stats = alloc_percpu_gfp(type, gfp);\
2197         if (pcpu_stats) {                                               \
2198                 int __cpu;                                              \
2199                 for_each_possible_cpu(__cpu) {                          \
2200                         typeof(type) *stat;                             \
2201                         stat = per_cpu_ptr(pcpu_stats, __cpu);          \
2202                         u64_stats_init(&stat->syncp);                   \
2203                 }                                                       \
2204         }                                                               \
2205         pcpu_stats;                                                     \
2206 })
2207 
2208 #define netdev_alloc_pcpu_stats(type)                                   \
2209         __netdev_alloc_pcpu_stats(type, GFP_KERNEL)
2210 
2211 enum netdev_lag_tx_type {
2212         NETDEV_LAG_TX_TYPE_UNKNOWN,
2213         NETDEV_LAG_TX_TYPE_RANDOM,
2214         NETDEV_LAG_TX_TYPE_BROADCAST,
2215         NETDEV_LAG_TX_TYPE_ROUNDROBIN,
2216         NETDEV_LAG_TX_TYPE_ACTIVEBACKUP,
2217         NETDEV_LAG_TX_TYPE_HASH,
2218 };
2219 
2220 struct netdev_lag_upper_info {
2221         enum netdev_lag_tx_type tx_type;
2222 };
2223 
2224 struct netdev_lag_lower_state_info {
2225         u8 link_up : 1,
2226            tx_enabled : 1;
2227 };
2228 
2229 #include <linux/notifier.h>
2230 
2231 /* netdevice notifier chain. Please remember to update the rtnetlink
2232  * notification exclusion list in rtnetlink_event() when adding new
2233  * types.
2234  */
2235 #define NETDEV_UP       0x0001  /* For now you can't veto a device up/down */
2236 #define NETDEV_DOWN     0x0002
2237 #define NETDEV_REBOOT   0x0003  /* Tell a protocol stack a network interface
2238                                    detected a hardware crash and restarted
2239                                    - we can use this eg to kick tcp sessions
2240                                    once done */
2241 #define NETDEV_CHANGE   0x0004  /* Notify device state change */
2242 #define NETDEV_REGISTER 0x0005
2243 #define NETDEV_UNREGISTER       0x0006
2244 #define NETDEV_CHANGEMTU        0x0007 /* notify after mtu change happened */
2245 #define NETDEV_CHANGEADDR       0x0008
2246 #define NETDEV_GOING_DOWN       0x0009
2247 #define NETDEV_CHANGENAME       0x000A
2248 #define NETDEV_FEAT_CHANGE      0x000B
2249 #define NETDEV_BONDING_FAILOVER 0x000C
2250 #define NETDEV_PRE_UP           0x000D
2251 #define NETDEV_PRE_TYPE_CHANGE  0x000E
2252 #define NETDEV_POST_TYPE_CHANGE 0x000F
2253 #define NETDEV_POST_INIT        0x0010
2254 #define NETDEV_UNREGISTER_FINAL 0x0011
2255 #define NETDEV_RELEASE          0x0012
2256 #define NETDEV_NOTIFY_PEERS     0x0013
2257 #define NETDEV_JOIN             0x0014
2258 #define NETDEV_CHANGEUPPER      0x0015
2259 #define NETDEV_RESEND_IGMP      0x0016
2260 #define NETDEV_PRECHANGEMTU     0x0017 /* notify before mtu change happened */
2261 #define NETDEV_CHANGEINFODATA   0x0018
2262 #define NETDEV_BONDING_INFO     0x0019
2263 #define NETDEV_PRECHANGEUPPER   0x001A
2264 #define NETDEV_CHANGELOWERSTATE 0x001B
2265 
2266 int register_netdevice_notifier(struct notifier_block *nb);
2267 int unregister_netdevice_notifier(struct notifier_block *nb);
2268 
2269 struct netdev_notifier_info {
2270         struct net_device *dev;
2271 };
2272 
2273 struct netdev_notifier_change_info {
2274         struct netdev_notifier_info info; /* must be first */
2275         unsigned int flags_changed;
2276 };
2277 
2278 struct netdev_notifier_changeupper_info {
2279         struct netdev_notifier_info info; /* must be first */
2280         struct net_device *upper_dev; /* new upper dev */
2281         bool master; /* is upper dev master */
2282         bool linking; /* is the notification for link or unlink */
2283         void *upper_info; /* upper dev info */
2284 };
2285 
2286 struct netdev_notifier_changelowerstate_info {
2287         struct netdev_notifier_info info; /* must be first */
2288         void *lower_state_info; /* is lower dev state */
2289 };
2290 
2291 static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
2292                                              struct net_device *dev)
2293 {
2294         info->dev = dev;
2295 }
2296 
2297 static inline struct net_device *
2298 netdev_notifier_info_to_dev(const struct netdev_notifier_info *info)
2299 {
2300         return info->dev;
2301 }
2302 
2303 int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
2304 
2305 
2306 extern rwlock_t                         dev_base_lock;          /* Device list lock */
2307 
2308 #define for_each_netdev(net, d)         \
2309                 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
2310 #define for_each_netdev_reverse(net, d) \
2311                 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
2312 #define for_each_netdev_rcu(net, d)             \
2313                 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
2314 #define for_each_netdev_safe(net, d, n) \
2315                 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
2316 #define for_each_netdev_continue(net, d)                \
2317                 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
2318 #define for_each_netdev_continue_rcu(net, d)            \
2319         list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
2320 #define for_each_netdev_in_bond_rcu(bond, slave)        \
2321                 for_each_netdev_rcu(&init_net, slave)   \
2322                         if (netdev_master_upper_dev_get_rcu(slave) == (bond))
2323 #define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)
2324 
2325 static inline struct net_device *next_net_device(struct net_device *dev)
2326 {
2327         struct list_head *lh;
2328         struct net *net;
2329 
2330         net = dev_net(dev);
2331         lh = dev->dev_list.next;
2332         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
2333 }
2334 
2335 static inline struct net_device *next_net_device_rcu(struct net_device *dev)
2336 {
2337         struct list_head *lh;
2338         struct net *net;
2339 
2340         net = dev_net(dev);
2341         lh = rcu_dereference(list_next_rcu(&dev->dev_list));
2342         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
2343 }
2344 
2345 static inline struct net_device *first_net_device(struct net *net)
2346 {
2347         return list_empty(&net->dev_base_head) ? NULL :
2348                 net_device_entry(net->dev_base_head.next);
2349 }
2350 
2351 static inline struct net_device *first_net_device_rcu(struct net *net)
2352 {
2353         struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head));
2354 
2355         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
2356 }
2357 
2358 int netdev_boot_setup_check(struct net_device *dev);
2359 unsigned long netdev_boot_base(const char *prefix, int unit);
2360 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
2361                                        const char *hwaddr);
2362 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
2363 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
2364 void dev_add_pack(struct packet_type *pt);
2365 void dev_remove_pack(struct packet_type *pt);
2366 void __dev_remove_pack(struct packet_type *pt);
2367 void dev_add_offload(struct packet_offload *po);
2368 void dev_remove_offload(struct packet_offload *po);
2369 
2370 int dev_get_iflink(const struct net_device *dev);
2371 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb);
2372 struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags,
2373                                       unsigned short mask);
2374 struct net_device *dev_get_by_name(struct net *net, const char *name);
2375 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name);
2376 struct net_device *__dev_get_by_name(struct net *net, const char *name);
2377 int dev_alloc_name(struct net_device *dev, const char *name);
2378 int dev_open(struct net_device *dev);
2379 int dev_close(struct net_device *dev);
2380 int dev_close_many(struct list_head *head, bool unlink);
2381 void dev_disable_lro(struct net_device *dev);
2382 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *newskb);
2383 int dev_queue_xmit(struct sk_buff *skb);
2384 int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv);
2385 int register_netdevice(struct net_device *dev);
2386 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head);
2387 void unregister_netdevice_many(struct list_head *head);
2388 static inline void unregister_netdevice(struct net_device *dev)
2389 {
2390         unregister_netdevice_queue(dev, NULL);
2391 }
2392 
2393 int netdev_refcnt_read(const struct net_device *dev);
2394 void free_netdev(struct net_device *dev);
2395 void netdev_freemem(struct net_device *dev);
2396 void synchronize_net(void);
2397 int init_dummy_netdev(struct net_device *dev);
2398 
2399 DECLARE_PER_CPU(int, xmit_recursion);
2400 static inline int dev_recursion_level(void)
2401 {
2402         return this_cpu_read(xmit_recursion);
2403 }
2404 
2405 struct net_device *dev_get_by_index(struct net *net, int ifindex);
2406 struct net_device *__dev_get_by_index(struct net *net, int ifindex);
2407 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);
2408 int netdev_get_name(struct net *net, char *name, int ifindex);
2409 int dev_restart(struct net_device *dev);
2410 int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb);
2411 
2412 static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
2413 {
2414         return NAPI_GRO_CB(skb)->data_offset;
2415 }
2416 
2417 static inline unsigned int skb_gro_len(const struct sk_buff *skb)
2418 {
2419         return skb->len - NAPI_GRO_CB(skb)->data_offset;
2420 }
2421 
2422 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
2423 {
2424         NAPI_GRO_CB(skb)->data_offset += len;
2425 }
2426 
2427 static inline void *skb_gro_header_fast(struct sk_buff *skb,
2428                                         unsigned int offset)
2429 {
2430         return NAPI_GRO_CB(skb)->frag0 + offset;
2431 }
2432 
2433 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
2434 {
2435         return NAPI_GRO_CB(skb)->frag0_len < hlen;
2436 }
2437 
2438 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
2439                                         unsigned int offset)
2440 {
2441         if (!pskb_may_pull(skb, hlen))
2442                 return NULL;
2443 
2444         NAPI_GRO_CB(skb)->frag0 = NULL;
2445         NAPI_GRO_CB(skb)->frag0_len = 0;
2446         return skb->data + offset;
2447 }
2448 
2449 static inline void *skb_gro_network_header(struct sk_buff *skb)
2450 {
2451         return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
2452                skb_network_offset(skb);
2453 }
2454 
2455 static inline void skb_gro_postpull_rcsum(struct sk_buff *skb,
2456                                         const void *start, unsigned int len)
2457 {
2458         if (NAPI_GRO_CB(skb)->csum_valid)
2459                 NAPI_GRO_CB(skb)->csum = csum_sub(NAPI_GRO_CB(skb)->csum,
2460                                                   csum_partial(start, len, 0));
2461 }
2462 
2463 /* GRO checksum functions. These are logical equivalents of the normal
2464  * checksum functions (in skbuff.h) except that they operate on the GRO
2465  * offsets and fields in sk_buff.
2466  */
2467 
2468 __sum16 __skb_gro_checksum_complete(struct sk_buff *skb);
2469 
2470 static inline bool skb_at_gro_remcsum_start(struct sk_buff *skb)
2471 {
2472         return (NAPI_GRO_CB(skb)->gro_remcsum_start == skb_gro_offset(skb));
2473 }
2474 
2475 static inline bool __skb_gro_checksum_validate_needed(struct sk_buff *skb,
2476                                                       bool zero_okay,
2477                                                       __sum16 check)
2478 {
2479         return ((skb->ip_summed != CHECKSUM_PARTIAL ||
2480                 skb_checksum_start_offset(skb) <
2481                  skb_gro_offset(skb)) &&
2482                 !skb_at_gro_remcsum_start(skb) &&
2483                 NAPI_GRO_CB(skb)->csum_cnt == 0 &&
2484                 (!zero_okay || check));
2485 }
2486 
2487 static inline __sum16 __skb_gro_checksum_validate_complete(struct sk_buff *skb,
2488                                                            __wsum psum)
2489 {
2490         if (NAPI_GRO_CB(skb)->csum_valid &&
2491             !csum_fold(csum_add(psum, NAPI_GRO_CB(skb)->csum)))
2492                 return 0;
2493 
2494         NAPI_GRO_CB(skb)->csum = psum;
2495 
2496         return __skb_gro_checksum_complete(skb);
2497 }
2498 
2499 static inline void skb_gro_incr_csum_unnecessary(struct sk_buff *skb)
2500 {
2501         if (NAPI_GRO_CB(skb)->csum_cnt > 0) {
2502                 /* Consume a checksum from CHECKSUM_UNNECESSARY */
2503                 NAPI_GRO_CB(skb)->csum_cnt--;
2504         } else {
2505                 /* Update skb for CHECKSUM_UNNECESSARY and csum_level when we
2506                  * verified a new top level checksum or an encapsulated one
2507                  * during GRO. This saves work if we fallback to normal path.
2508                  */
2509                 __skb_incr_checksum_unnecessary(skb);
2510         }
2511 }
2512 
2513 #define __skb_gro_checksum_validate(skb, proto, zero_okay, check,       \
2514                                     compute_pseudo)                     \
2515 ({                                                                      \
2516         __sum16 __ret = 0;                                              \
2517         if (__skb_gro_checksum_validate_needed(skb, zero_okay, check))  \
2518                 __ret = __skb_gro_checksum_validate_complete(skb,       \
2519                                 compute_pseudo(skb, proto));            \
2520         if (__ret)                                                      \
2521                 __skb_mark_checksum_bad(skb);                           \
2522         else                                                            \
2523                 skb_gro_incr_csum_unnecessary(skb);                     \
2524         __ret;                                                          \
2525 })
2526 
2527 #define skb_gro_checksum_validate(skb, proto, compute_pseudo)           \
2528         __skb_gro_checksum_validate(skb, proto, false, 0, compute_pseudo)
2529 
2530 #define skb_gro_checksum_validate_zero_check(skb, proto, check,         \
2531                                              compute_pseudo)            \
2532         __skb_gro_checksum_validate(skb, proto, true, check, compute_pseudo)
2533 
2534 #define skb_gro_checksum_simple_validate(skb)                           \
2535         __skb_gro_checksum_validate(skb, 0, false, 0, null_compute_pseudo)
2536 
2537 static inline bool __skb_gro_checksum_convert_check(struct sk_buff *skb)
2538 {
2539         return (NAPI_GRO_CB(skb)->csum_cnt == 0 &&
2540                 !NAPI_GRO_CB(skb)->csum_valid);
2541 }
2542 
2543 static inline void __skb_gro_checksum_convert(struct sk_buff *skb,
2544                                               __sum16 check, __wsum pseudo)
2545 {
2546         NAPI_GRO_CB(skb)->csum = ~pseudo;
2547         NAPI_GRO_CB(skb)->csum_valid = 1;
2548 }
2549 
2550 #define skb_gro_checksum_try_convert(skb, proto, check, compute_pseudo) \
2551 do {                                                                    \
2552         if (__skb_gro_checksum_convert_check(skb))                      \
2553                 __skb_gro_checksum_convert(skb, check,                  \
2554                                            compute_pseudo(skb, proto)); \
2555 } while (0)
2556 
2557 struct gro_remcsum {
2558         int offset;
2559         __wsum delta;
2560 };
2561 
2562 static inline void skb_gro_remcsum_init(struct gro_remcsum *grc)
2563 {
2564         grc->offset = 0;
2565         grc->delta = 0;
2566 }
2567 
2568 static inline void *skb_gro_remcsum_process(struct sk_buff *skb, void *ptr,
2569                                             unsigned int off, size_t hdrlen,
2570                                             int start, int offset,
2571                                             struct gro_remcsum *grc,
2572                                             bool nopartial)
2573 {
2574         __wsum delta;
2575         size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start);
2576 
2577         BUG_ON(!NAPI_GRO_CB(skb)->csum_valid);
2578 
2579         if (!nopartial) {
2580                 NAPI_GRO_CB(skb)->gro_remcsum_start = off + hdrlen + start;
2581                 return ptr;
2582         }
2583 
2584         ptr = skb_gro_header_fast(skb, off);
2585         if (skb_gro_header_hard(skb, off + plen)) {
2586                 ptr = skb_gro_header_slow(skb, off + plen, off);
2587                 if (!ptr)
2588                         return NULL;
2589         }
2590 
2591         delta = remcsum_adjust(ptr + hdrlen, NAPI_GRO_CB(skb)->csum,
2592                                start, offset);
2593 
2594         /* Adjust skb->csum since we changed the packet */
2595         NAPI_GRO_CB(skb)->csum = csum_add(NAPI_GRO_CB(skb)->csum, delta);
2596 
2597         grc->offset = off + hdrlen + offset;
2598         grc->delta = delta;
2599 
2600         return ptr;
2601 }
2602 
2603 static inline void skb_gro_remcsum_cleanup(struct sk_buff *skb,
2604                                            struct gro_remcsum *grc)
2605 {
2606         void *ptr;
2607         size_t plen = grc->offset + sizeof(u16);
2608 
2609         if (!grc->delta)
2610                 return;
2611 
2612         ptr = skb_gro_header_fast(skb, grc->offset);
2613         if (skb_gro_header_hard(skb, grc->offset + sizeof(u16))) {
2614                 ptr = skb_gro_header_slow(skb, plen, grc->offset);
2615                 if (!ptr)
2616                         return;
2617         }
2618 
2619         remcsum_unadjust((__sum16 *)ptr, grc->delta);
2620 }
2621 
2622 struct skb_csum_offl_spec {
2623         __u16           ipv4_okay:1,
2624                         ipv6_okay:1,
2625                         encap_okay:1,
2626                         ip_options_okay:1,
2627                         ext_hdrs_okay:1,
2628                         tcp_okay:1,
2629                         udp_okay:1,
2630                         sctp_okay:1,
2631                         vlan_okay:1,
2632                         no_encapped_ipv6:1,
2633                         no_not_encapped:1;
2634 };
2635 
2636 bool __skb_csum_offload_chk(struct sk_buff *skb,
2637                             const struct skb_csum_offl_spec *spec,
2638                             bool *csum_encapped,
2639                             bool csum_help);
2640 
2641 static inline bool skb_csum_offload_chk(struct sk_buff *skb,
2642                                         const struct skb_csum_offl_spec *spec,
2643                                         bool *csum_encapped,
2644                                         bool csum_help)
2645 {
2646         if (skb->ip_summed != CHECKSUM_PARTIAL)
2647                 return false;
2648 
2649         return __skb_csum_offload_chk(skb, spec, csum_encapped, csum_help);
2650 }
2651 
2652 static inline bool skb_csum_offload_chk_help(struct sk_buff *skb,
2653                                              const struct skb_csum_offl_spec *spec)
2654 {
2655         bool csum_encapped;
2656 
2657         return skb_csum_offload_chk(skb, spec, &csum_encapped, true);
2658 }
2659 
2660 static inline bool skb_csum_off_chk_help_cmn(struct sk_buff *skb)
2661 {
2662         static const struct skb_csum_offl_spec csum_offl_spec = {
2663                 .ipv4_okay = 1,
2664                 .ip_options_okay = 1,
2665                 .ipv6_okay = 1,
2666                 .vlan_okay = 1,
2667                 .tcp_okay = 1,
2668                 .udp_okay = 1,
2669         };
2670 
2671         return skb_csum_offload_chk_help(skb, &csum_offl_spec);
2672 }
2673 
2674 static inline bool skb_csum_off_chk_help_cmn_v4_only(struct sk_buff *skb)
2675 {
2676         static const struct skb_csum_offl_spec csum_offl_spec = {
2677                 .ipv4_okay = 1,
2678                 .ip_options_okay = 1,
2679                 .tcp_okay = 1,
2680                 .udp_okay = 1,
2681                 .vlan_okay = 1,
2682         };
2683 
2684         return skb_csum_offload_chk_help(skb, &csum_offl_spec);
2685 }
2686 
2687 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
2688                                   unsigned short type,
2689                                   const void *daddr, const void *saddr,
2690                                   unsigned int len)
2691 {
2692         if (!dev->header_ops || !dev->header_ops->create)
2693                 return 0;
2694 
2695         return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
2696 }
2697 
2698 static inline int dev_parse_header(const struct sk_buff *skb,
2699                                    unsigned char *haddr)
2700 {
2701         const struct net_device *dev = skb->dev;
2702 
2703         if (!dev->header_ops || !dev->header_ops->parse)
2704                 return 0;
2705         return dev->header_ops->parse(skb, haddr);
2706 }
2707 
2708 /* ll_header must have at least hard_header_len allocated */
2709 static inline bool dev_validate_header(const struct net_device *dev,
2710                                        char *ll_header, int len)
2711 {
2712         if (likely(len >= dev->hard_header_len))
2713                 return true;
2714 
2715         if (capable(CAP_SYS_RAWIO)) {
2716                 memset(ll_header + len, 0, dev->hard_header_len - len);
2717                 return true;
2718         }
2719 
2720         if (dev->header_ops && dev->header_ops->validate)
2721                 return dev->header_ops->validate(ll_header, len);
2722 
2723         return false;
2724 }
2725 
2726 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
2727 int register_gifconf(unsigned int family, gifconf_func_t *gifconf);
2728 static inline int unregister_gifconf(unsigned int family)
2729 {
2730         return register_gifconf(family, NULL);
2731 }
2732 
2733 #ifdef CONFIG_NET_FLOW_LIMIT
2734 #define FLOW_LIMIT_HISTORY      (1 << 7)  /* must be ^2 and !overflow buckets */
2735 struct sd_flow_limit {
2736         u64                     count;
2737         unsigned int            num_buckets;
2738         unsigned int            history_head;
2739         u16                     history[FLOW_LIMIT_HISTORY];
2740         u8                      buckets[];
2741 };
2742 
2743 extern int netdev_flow_limit_table_len;
2744 #endif /* CONFIG_NET_FLOW_LIMIT */
2745 
2746 /*
2747  * Incoming packets are placed on per-CPU queues
2748  */
2749 struct softnet_data {
2750         struct list_head        poll_list;
2751         struct sk_buff_head     process_queue;
2752 
2753         /* stats */
2754         unsigned int            processed;
2755         unsigned int            time_squeeze;
2756         unsigned int            cpu_collision;
2757         unsigned int            received_rps;
2758 #ifdef CONFIG_RPS
2759         struct softnet_data     *rps_ipi_list;
2760 #endif
2761 #ifdef CONFIG_NET_FLOW_LIMIT
2762         struct sd_flow_limit __rcu *flow_limit;
2763 #endif
2764         struct Qdisc            *output_queue;
2765         struct Qdisc            **output_queue_tailp;
2766         struct sk_buff          *completion_queue;
2767 
2768 #ifdef CONFIG_RPS
2769         /* Elements below can be accessed between CPUs for RPS */
2770         struct call_single_data csd ____cacheline_aligned_in_smp;
2771         struct softnet_data     *rps_ipi_next;
2772         unsigned int            cpu;
2773         unsigned int            input_queue_head;
2774         unsigned int            input_queue_tail;
2775 #endif
2776         unsigned int            dropped;
2777         struct sk_buff_head     input_pkt_queue;
2778         struct napi_struct      backlog;
2779 
2780 };
2781 
2782 static inline void input_queue_head_incr(struct softnet_data *sd)
2783 {
2784 #ifdef CONFIG_RPS
2785         sd->input_queue_head++;
2786 #endif
2787 }
2788 
2789 static inline void input_queue_tail_incr_save(struct softnet_data *sd,
2790                                               unsigned int *qtail)
2791 {
2792 #ifdef CONFIG_RPS
2793         *qtail = ++sd->input_queue_tail;
2794 #endif
2795 }
2796 
2797 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
2798 
2799 void __netif_schedule(struct Qdisc *q);
2800 void netif_schedule_queue(struct netdev_queue *txq);
2801 
2802 static inline void netif_tx_schedule_all(struct net_device *dev)
2803 {
2804         unsigned int i;
2805 
2806         for (i = 0; i < dev->num_tx_queues; i++)
2807                 netif_schedule_queue(netdev_get_tx_queue(dev, i));
2808 }
2809 
2810 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
2811 {
2812         clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2813 }
2814 
2815 /**
2816  *      netif_start_queue - allow transmit
2817  *      @dev: network device
2818  *
2819  *      Allow upper layers to call the device hard_start_xmit routine.
2820  */
2821 static inline void netif_start_queue(struct net_device *dev)
2822 {
2823         netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
2824 }
2825 
2826 static inline void netif_tx_start_all_queues(struct net_device *dev)
2827 {
2828         unsigned int i;
2829 
2830         for (i = 0; i < dev->num_tx_queues; i++) {
2831                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2832                 netif_tx_start_queue(txq);
2833         }
2834 }
2835 
2836 void netif_tx_wake_queue(struct netdev_queue *dev_queue);
2837 
2838 /**
2839  *      netif_wake_queue - restart transmit
2840  *      @dev: network device
2841  *
2842  *      Allow upper layers to call the device hard_start_xmit routine.
2843  *      Used for flow control when transmit resources are available.
2844  */
2845 static inline void netif_wake_queue(struct net_device *dev)
2846 {
2847         netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
2848 }
2849 
2850 static inline void netif_tx_wake_all_queues(struct net_device *dev)
2851 {
2852         unsigned int i;
2853 
2854         for (i = 0; i < dev->num_tx_queues; i++) {
2855                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2856                 netif_tx_wake_queue(txq);
2857         }
2858 }
2859 
2860 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
2861 {
2862         set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2863 }
2864 
2865 /**
2866  *      netif_stop_queue - stop transmitted packets
2867  *      @dev: network device
2868  *
2869  *      Stop upper layers calling the device hard_start_xmit routine.
2870  *      Used for flow control when transmit resources are unavailable.
2871  */
2872 static inline void netif_stop_queue(struct net_device *dev)
2873 {
2874         netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
2875 }
2876 
2877 void netif_tx_stop_all_queues(struct net_device *dev);
2878 
2879 static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
2880 {
2881         return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2882 }
2883 
2884 /**
2885  *      netif_queue_stopped - test if transmit queue is flowblocked
2886  *      @dev: network device
2887  *
2888  *      Test if transmit queue on device is currently unable to send.
2889  */
2890 static inline bool netif_queue_stopped(const struct net_device *dev)
2891 {
2892         return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
2893 }
2894 
2895 static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
2896 {
2897         return dev_queue->state & QUEUE_STATE_ANY_XOFF;
2898 }
2899 
2900 static inline bool
2901 netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
2902 {
2903         return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
2904 }
2905 
2906 static inline bool
2907 netif_xmit_frozen_or_drv_stopped(const struct netdev_queue *dev_queue)
2908 {
2909         return dev_queue->state & QUEUE_STATE_DRV_XOFF_OR_FROZEN;
2910 }
2911 
2912 /**
2913  *      netdev_txq_bql_enqueue_prefetchw - prefetch bql data for write
2914  *      @dev_queue: pointer to transmit queue
2915  *
2916  * BQL enabled drivers might use this helper in their ndo_start_xmit(),
2917  * to give appropriate hint to the CPU.
2918  */
2919 static inline void netdev_txq_bql_enqueue_prefetchw(struct netdev_queue *dev_queue)
2920 {
2921 #ifdef CONFIG_BQL
2922         prefetchw(&dev_queue->dql.num_queued);
2923 #endif
2924 }
2925 
2926 /**
2927  *      netdev_txq_bql_complete_prefetchw - prefetch bql data for write
2928  *      @dev_queue: pointer to transmit queue
2929  *
2930  * BQL enabled drivers might use this helper in their TX completion path,
2931  * to give appropriate hint to the CPU.
2932  */
2933 static inline void netdev_txq_bql_complete_prefetchw(struct netdev_queue *dev_queue)
2934 {
2935 #ifdef CONFIG_BQL
2936         prefetchw(&dev_queue->dql.limit);
2937 #endif
2938 }
2939 
2940 static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
2941                                         unsigned int bytes)
2942 {
2943 #ifdef CONFIG_BQL
2944         dql_queued(&dev_queue->dql, bytes);
2945 
2946         if (likely(dql_avail(&dev_queue->dql) >= 0))
2947                 return;
2948 
2949         set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
2950 
2951         /*
2952          * The XOFF flag must be set before checking the dql_avail below,
2953          * because in netdev_tx_completed_queue we update the dql_completed
2954          * before checking the XOFF flag.
2955          */
2956         smp_mb();
2957 
2958         /* check again in case another CPU has just made room avail */
2959         if (unlikely(dql_avail(&dev_queue->dql) >= 0))
2960                 clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
2961 #endif
2962 }
2963 
2964 /**
2965  *      netdev_sent_queue - report the number of bytes queued to hardware
2966  *      @dev: network device
2967  *      @bytes: number of bytes queued to the hardware device queue
2968  *
2969  *      Report the number of bytes queued for sending/completion to the network
2970  *      device hardware queue. @bytes should be a good approximation and should
2971  *      exactly match netdev_completed_queue() @bytes
2972  */
2973 static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes)
2974 {
2975         netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes);
2976 }
2977 
2978 static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue,
2979                                              unsigned int pkts, unsigned int bytes)
2980 {
2981 #ifdef CONFIG_BQL
2982         if (unlikely(!bytes))
2983                 return;
2984 
2985         dql_completed(&dev_queue->dql, bytes);
2986 
2987         /*
2988          * Without the memory barrier there is a small possiblity that
2989          * netdev_tx_sent_queue will miss the update and cause the queue to
2990          * be stopped forever
2991          */
2992         smp_mb();
2993 
2994         if (dql_avail(&dev_queue->dql) < 0)
2995                 return;
2996 
2997         if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state))
2998                 netif_schedule_queue(dev_queue);
2999 #endif
3000 }
3001 
3002 /**
3003  *      netdev_completed_queue - report bytes and packets completed by device
3004  *      @dev: network device
3005  *      @pkts: actual number of packets sent over the medium
3006  *      @bytes: actual number of bytes sent over the medium
3007  *
3008  *      Report the number of bytes and packets transmitted by the network device
3009  *      hardware queue over the physical medium, @bytes must exactly match the
3010  *      @bytes amount passed to netdev_sent_queue()
3011  */
3012 static inline void netdev_completed_queue(struct net_device *dev,
3013                                           unsigned int pkts, unsigned int bytes)
3014 {
3015         netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes);
3016 }
3017 
3018 static inline void netdev_tx_reset_queue(struct netdev_queue *q)
3019 {
3020 #ifdef CONFIG_BQL
3021         clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
3022         dql_reset(&q->dql);
3023 #endif
3024 }
3025 
3026 /**
3027  *      netdev_reset_queue - reset the packets and bytes count of a network device
3028  *      @dev_queue: network device
3029  *
3030  *      Reset the bytes and packet count of a network device and clear the
3031  *      software flow control OFF bit for this network device
3032  */
3033 static inline void netdev_reset_queue(struct net_device *dev_queue)
3034 {
3035         netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
3036 }
3037 
3038 /**
3039  *      netdev_cap_txqueue - check if selected tx queue exceeds device queues
3040  *      @dev: network device
3041  *      @queue_index: given tx queue index
3042  *
3043  *      Returns 0 if given tx queue index >= number of device tx queues,
3044  *      otherwise returns the originally passed tx queue index.
3045  */
3046 static inline u16 netdev_cap_txqueue(struct net_device *dev, u16 queue_index)
3047 {
3048         if (unlikely(queue_index >= dev->real_num_tx_queues)) {
3049                 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
3050                                      dev->name, queue_index,
3051                                      dev->real_num_tx_queues);
3052                 return 0;
3053         }
3054 
3055         return queue_index;
3056 }
3057 
3058 /**
3059  *      netif_running - test if up
3060  *      @dev: network device
3061  *
3062  *      Test if the device has been brought up.
3063  */
3064 static inline bool netif_running(const struct net_device *dev)
3065 {
3066         return test_bit(__LINK_STATE_START, &dev->state);
3067 }
3068 
3069 /*
3070  * Routines to manage the subqueues on a device.  We only need start,
3071  * stop, and a check if it's stopped.  All other device management is
3072  * done at the overall netdevice level.
3073  * Also test the device if we're multiqueue.
3074  */
3075 
3076 /**
3077  *      netif_start_subqueue - allow sending packets on subqueue
3078  *      @dev: network device
3079  *      @queue_index: sub queue index
3080  *
3081  * Start individual transmit queue of a device with multiple transmit queues.
3082  */
3083 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
3084 {
3085         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3086 
3087         netif_tx_start_queue(txq);
3088 }
3089 
3090 /**
3091  *      netif_stop_subqueue - stop sending packets on subqueue
3092  *      @dev: network device
3093  *      @queue_index: sub queue index
3094  *
3095  * Stop individual transmit queue of a device with multiple transmit queues.
3096  */
3097 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
3098 {
3099         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3100         netif_tx_stop_queue(txq);
3101 }
3102 
3103 /**
3104  *      netif_subqueue_stopped - test status of subqueue
3105  *      @dev: network device
3106  *      @queue_index: sub queue index
3107  *
3108  * Check individual transmit queue of a device with multiple transmit queues.
3109  */
3110 static inline bool __netif_subqueue_stopped(const struct net_device *dev,
3111                                             u16 queue_index)
3112 {
3113         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3114 
3115         return netif_tx_queue_stopped(txq);
3116 }
3117 
3118 static inline bool netif_subqueue_stopped(const struct net_device *dev,
3119                                           struct sk_buff *skb)
3120 {
3121         return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
3122 }
3123 
3124 void netif_wake_subqueue(struct net_device *dev, u16 queue_index);
3125 
3126 #ifdef CONFIG_XPS
3127 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
3128                         u16 index);
3129 #else
3130 static inline int netif_set_xps_queue(struct net_device *dev,
3131                                       const struct cpumask *mask,
3132                                       u16 index)
3133 {
3134         return 0;
3135 }
3136 #endif
3137 
3138 u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb,
3139                   unsigned int num_tx_queues);
3140 
3141 /*
3142  * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
3143  * as a distribution range limit for the returned value.
3144  */
3145 static inline u16 skb_tx_hash(const struct net_device *dev,
3146                               struct sk_buff *skb)
3147 {
3148         return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
3149 }
3150 
3151 /**
3152  *      netif_is_multiqueue - test if device has multiple transmit queues
3153  *      @dev: network device
3154  *
3155  * Check if device has multiple transmit queues
3156  */
3157 static inline bool netif_is_multiqueue(const struct net_device *dev)
3158 {
3159         return dev->num_tx_queues > 1;
3160 }
3161 
3162 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq);
3163 
3164 #ifdef CONFIG_SYSFS
3165 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq);
3166 #else
3167 static inline int netif_set_real_num_rx_queues(struct net_device *dev,
3168                                                 unsigned int rxq)
3169 {
3170         return 0;
3171 }
3172 #endif
3173 
3174 #ifdef CONFIG_SYSFS
3175 static inline unsigned int get_netdev_rx_queue_index(
3176                 struct netdev_rx_queue *queue)
3177 {
3178         struct net_device *dev = queue->dev;
3179         int index = queue - dev->_rx;
3180 
3181         BUG_ON(index >= dev->num_rx_queues);
3182         return index;
3183 }
3184 #endif
3185 
3186 #define DEFAULT_MAX_NUM_RSS_QUEUES      (8)
3187 int netif_get_num_default_rss_queues(void);
3188 
3189 enum skb_free_reason {
3190         SKB_REASON_CONSUMED,
3191         SKB_REASON_DROPPED,
3192 };
3193 
3194 void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason);
3195 void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason);
3196 
3197 /*
3198  * It is not allowed to call kfree_skb() or consume_skb() from hardware
3199  * interrupt context or with hardware interrupts being disabled.
3200  * (in_irq() || irqs_disabled())
3201  *
3202  * We provide four helpers that can be used in following contexts :
3203  *
3204  * dev_kfree_skb_irq(skb) when caller drops a packet from irq context,
3205  *  replacing kfree_skb(skb)
3206  *
3207  * dev_consume_skb_irq(skb) when caller consumes a packet from irq context.
3208  *  Typically used in place of consume_skb(skb) in TX completion path
3209  *
3210  * dev_kfree_skb_any(skb) when caller doesn't know its current irq context,
3211  *  replacing kfree_skb(skb)
3212  *
3213  * dev_consume_skb_any(skb) when caller doesn't know its current irq context,
3214  *  and consumed a packet. Used in place of consume_skb(skb)
3215  */
3216 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
3217 {
3218         __dev_kfree_skb_irq(skb, SKB_REASON_DROPPED);
3219 }
3220 
3221 static inline void dev_consume_skb_irq(struct sk_buff *skb)
3222 {
3223         __dev_kfree_skb_irq(skb, SKB_REASON_CONSUMED);
3224 }
3225 
3226 static inline void dev_kfree_skb_any(struct sk_buff *skb)
3227 {
3228         __dev_kfree_skb_any(skb, SKB_REASON_DROPPED);
3229 }
3230 
3231 static inline void dev_consume_skb_any(struct sk_buff *skb)
3232 {
3233         __dev_kfree_skb_any(skb, SKB_REASON_CONSUMED);
3234 }
3235 
3236 int netif_rx(struct sk_buff *skb);
3237 int netif_rx_ni(struct sk_buff *skb);
3238 int netif_receive_skb(struct sk_buff *skb);
3239 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb);
3240 void napi_gro_flush(struct napi_struct *napi, bool flush_old);
3241 struct sk_buff *napi_get_frags(struct napi_struct *napi);
3242 gro_result_t napi_gro_frags(struct napi_struct *napi);
3243 struct packet_offload *gro_find_receive_by_type(__be16 type);
3244 struct packet_offload *gro_find_complete_by_type(__be16 type);
3245 
3246 static inline void napi_free_frags(struct napi_struct *napi)
3247 {
3248         kfree_skb(napi->skb);
3249         napi->skb = NULL;
3250 }
3251 
3252 int netdev_rx_handler_register(struct net_device *dev,
3253                                rx_handler_func_t *rx_handler,
3254                                void *rx_handler_data);
3255 void netdev_rx_handler_unregister(struct net_device *dev);
3256 
3257 bool dev_valid_name(const char *name);
3258 int dev_ioctl(struct net *net, unsigned int cmd, void __user *);
3259 int dev_ethtool(struct net *net, struct ifreq *);
3260 unsigned int dev_get_flags(const struct net_device *);
3261 int __dev_change_flags(struct net_device *, unsigned int flags);
3262 int dev_change_flags(struct net_device *, unsigned int);
3263 void __dev_notify_flags(struct net_device *, unsigned int old_flags,
3264                         unsigned int gchanges);
3265 int dev_change_name(struct net_device *, const char *);
3266 int dev_set_alias(struct net_device *, const char *, size_t);
3267 int dev_change_net_namespace(struct net_device *, struct net *, const char *);
3268 int dev_set_mtu(struct net_device *, int);
3269 void dev_set_group(struct net_device *, int);
3270 int dev_set_mac_address(struct net_device *, struct sockaddr *);
3271 int dev_change_carrier(struct net_device *, bool new_carrier);
3272 int dev_get_phys_port_id(struct net_device *dev,
3273                          struct netdev_phys_item_id *ppid);
3274 int dev_get_phys_port_name(struct net_device *dev,
3275                            char *name, size_t len);
3276 int dev_change_proto_down(struct net_device *dev, bool proto_down);
3277 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev);
3278 struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
3279                                     struct netdev_queue *txq, int *ret);
3280 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
3281 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
3282 bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb);
3283 
3284 extern int              netdev_budget;
3285 
3286 /* Called by rtnetlink.c:rtnl_unlock() */
3287 void netdev_run_todo(void);
3288 
3289 /**
3290  *      dev_put - release reference to device
3291  *      @dev: network device
3292  *
3293  * Release reference to device to allow it to be freed.
3294  */
3295 static inline void dev_put(struct net_device *dev)
3296 {
3297         this_cpu_dec(*dev->pcpu_refcnt);
3298 }
3299 
3300 /**
3301  *      dev_hold - get reference to device
3302  *      @dev: network device
3303  *
3304  * Hold reference to device to keep it from being freed.
3305  */
3306 static inline void dev_hold(struct net_device *dev)
3307 {
3308         this_cpu_inc(*dev->pcpu_refcnt);
3309 }
3310 
3311 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
3312  * and _off may be called from IRQ context, but it is caller
3313  * who is responsible for serialization of these calls.
3314  *
3315  * The name carrier is inappropriate, these functions should really be
3316  * called netif_lowerlayer_*() because they represent the state of any
3317  * kind of lower layer not just hardware media.
3318  */
3319 
3320 void linkwatch_init_dev(struct net_device *dev);
3321 void linkwatch_fire_event(struct net_device *dev);
3322 void linkwatch_forget_dev(struct net_device *dev);
3323 
3324 /**
3325  *      netif_carrier_ok - test if carrier present
3326  *      @dev: network device
3327  *
3328  * Check if carrier is present on device
3329  */
3330 static inline bool netif_carrier_ok(const struct net_device *dev)
3331 {
3332         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
3333 }
3334 
3335 unsigned long dev_trans_start(struct net_device *dev);
3336 
3337 void __netdev_watchdog_up(struct net_device *dev);
3338 
3339 void netif_carrier_on(struct net_device *dev);
3340 
3341 void netif_carrier_off(struct net_device *dev);
3342 
3343 /**
3344  *      netif_dormant_on - mark device as dormant.
3345  *      @dev: network device
3346  *
3347  * Mark device as dormant (as per RFC2863).
3348  *
3349  * The dormant state indicates that the relevant interface is not
3350  * actually in a condition to pass packets (i.e., it is not 'up') but is
3351  * in a "pending" state, waiting for some external event.  For "on-
3352  * demand" interfaces, this new state identifies the situation where the
3353  * interface is waiting for events to place it in the up state.
3354  */
3355 static inline void netif_dormant_on(struct net_device *dev)
3356 {
3357         if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
3358                 linkwatch_fire_event(dev);
3359 }
3360 
3361 /**
3362  *      netif_dormant_off - set device as not dormant.
3363  *      @dev: network device
3364  *
3365  * Device is not in dormant state.
3366  */
3367 static inline void netif_dormant_off(struct net_device *dev)
3368 {
3369         if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
3370                 linkwatch_fire_event(dev);
3371 }
3372 
3373 /**
3374  *      netif_dormant - test if carrier present
3375  *      @dev: network device
3376  *
3377  * Check if carrier is present on device
3378  */
3379 static inline bool netif_dormant(const struct net_device *dev)
3380 {
3381         return test_bit(__LINK_STATE_DORMANT, &dev->state);
3382 }
3383 
3384 
3385 /**
3386  *      netif_oper_up - test if device is operational
3387  *      @dev: network device
3388  *
3389  * Check if carrier is operational
3390  */
3391 static inline bool netif_oper_up(const struct net_device *dev)
3392 {
3393         return (dev->operstate == IF_OPER_UP ||
3394                 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
3395 }
3396 
3397 /**
3398  *      netif_device_present - is device available or removed
3399  *      @dev: network device
3400  *
3401  * Check if device has not been removed from system.
3402  */
3403 static inline bool netif_device_present(struct net_device *dev)
3404 {
3405         return test_bit(__LINK_STATE_PRESENT, &dev->state);
3406 }
3407 
3408 void netif_device_detach(struct net_device *dev);
3409 
3410 void netif_device_attach(struct net_device *dev);
3411 
3412 /*
3413  * Network interface message level settings
3414  */
3415 
3416 enum {
3417         NETIF_MSG_DRV           = 0x0001,
3418         NETIF_MSG_PROBE         = 0x0002,
3419         NETIF_MSG_LINK          = 0x0004,
3420         NETIF_MSG_TIMER         = 0x0008,
3421         NETIF_MSG_IFDOWN        = 0x0010,
3422         NETIF_MSG_IFUP          = 0x0020,
3423         NETIF_MSG_RX_ERR        = 0x0040,
3424         NETIF_MSG_TX_ERR        = 0x0080,
3425         NETIF_MSG_TX_QUEUED     = 0x0100,
3426         NETIF_MSG_INTR          = 0x0200,
3427         NETIF_MSG_TX_DONE       = 0x0400,
3428         NETIF_MSG_RX_STATUS     = 0x0800,
3429         NETIF_MSG_PKTDATA       = 0x1000,
3430         NETIF_MSG_HW            = 0x2000,
3431         NETIF_MSG_WOL           = 0x4000,
3432 };
3433 
3434 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
3435 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
3436 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
3437 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
3438 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
3439 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
3440 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
3441 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
3442 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
3443 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
3444 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
3445 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
3446 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
3447 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
3448 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
3449 
3450 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
3451 {
3452         /* use default */
3453         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
3454                 return default_msg_enable_bits;
3455         if (debug_value == 0)   /* no output */
3456                 return 0;
3457         /* set low N bits */
3458         return (1 << debug_value) - 1;
3459 }
3460 
3461 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
3462 {
3463         spin_lock(&txq->_xmit_lock);
3464         txq->xmit_lock_owner = cpu;
3465 }
3466 
3467 static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
3468 {
3469         spin_lock_bh(&txq->_xmit_lock);
3470         txq->xmit_lock_owner = smp_processor_id();
3471 }
3472 
3473 static inline bool __netif_tx_trylock(struct netdev_queue *txq)
3474 {
3475         bool ok = spin_trylock(&txq->_xmit_lock);
3476         if (likely(ok))
3477                 txq->xmit_lock_owner = smp_processor_id();
3478         return ok;
3479 }
3480 
3481 static inline void __netif_tx_unlock(struct netdev_queue *txq)
3482 {
3483         txq->xmit_lock_owner = -1;
3484         spin_unlock(&txq->_xmit_lock);
3485 }
3486 
3487 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
3488 {
3489         txq->xmit_lock_owner = -1;
3490         spin_unlock_bh(&txq->_xmit_lock);
3491 }
3492 
3493 static inline void txq_trans_update(struct netdev_queue *txq)
3494 {
3495         if (txq->xmit_lock_owner != -1)
3496                 txq->trans_start = jiffies;
3497 }
3498 
3499 /**
3500  *      netif_tx_lock - grab network device transmit lock
3501  *      @dev: network device
3502  *
3503  * Get network device transmit lock
3504  */
3505 static inline void netif_tx_lock(struct net_device *dev)
3506 {
3507         unsigned int i;
3508         int cpu;
3509 
3510         spin_lock(&dev->tx_global_lock);
3511         cpu = smp_processor_id();
3512         for (i = 0; i < dev->num_tx_queues; i++) {
3513                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3514 
3515                 /* We are the only thread of execution doing a
3516                  * freeze, but we have to grab the _xmit_lock in
3517                  * order to synchronize with threads which are in
3518                  * the ->hard_start_xmit() handler and already
3519                  * checked the frozen bit.
3520                  */
3521                 __netif_tx_lock(txq, cpu);
3522                 set_bit(__QUEUE_STATE_FROZEN, &txq->state);
3523                 __netif_tx_unlock(txq);
3524         }
3525 }
3526 
3527 static inline void netif_tx_lock_bh(struct net_device *dev)
3528 {
3529         local_bh_disable();
3530         netif_tx_lock(dev);
3531 }
3532 
3533 static inline void netif_tx_unlock(struct net_device *dev)
3534 {
3535         unsigned int i;
3536 
3537         for (i = 0; i < dev->num_tx_queues; i++) {
3538                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3539 
3540                 /* No need to grab the _xmit_lock here.  If the
3541                  * queue is not stopped for another reason, we
3542                  * force a schedule.
3543                  */
3544                 clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
3545                 netif_schedule_queue(txq);
3546         }
3547         spin_unlock(&dev->tx_global_lock);
3548 }
3549 
3550 static inline void netif_tx_unlock_bh(struct net_device *dev)
3551 {
3552         netif_tx_unlock(dev);
3553         local_bh_enable();
3554 }
3555 
3556 #define HARD_TX_LOCK(dev, txq, cpu) {                   \
3557         if ((dev->features & NETIF_F_LLTX) == 0) {      \
3558                 __netif_tx_lock(txq, cpu);              \
3559         }                                               \
3560 }
3561 
3562 #define HARD_TX_TRYLOCK(dev, txq)                       \
3563         (((dev->features & NETIF_F_LLTX) == 0) ?        \
3564                 __netif_tx_trylock(txq) :               \
3565                 true )
3566 
3567 #define HARD_TX_UNLOCK(dev, txq) {                      \
3568         if ((dev->features & NETIF_F_LLTX) == 0) {      \
3569                 __netif_tx_unlock(txq);                 \
3570         }                                               \
3571 }
3572 
3573 static inline void netif_tx_disable(struct net_device *dev)
3574 {
3575         unsigned int i;
3576         int cpu;
3577 
3578         local_bh_disable();
3579         cpu = smp_processor_id();
3580         for (i = 0; i < dev->num_tx_queues; i++) {
3581                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3582 
3583                 __netif_tx_lock(txq, cpu);
3584                 netif_tx_stop_queue(txq);
3585                 __netif_tx_unlock(txq);
3586         }
3587         local_bh_enable();
3588 }
3589 
3590 static inline void netif_addr_lock(struct net_device *dev)
3591 {
3592         spin_lock(&dev->addr_list_lock);
3593 }
3594 
3595 static inline void netif_addr_lock_nested(struct net_device *dev)
3596 {
3597         int subclass = SINGLE_DEPTH_NESTING;
3598 
3599         if (dev->netdev_ops->ndo_get_lock_subclass)
3600                 subclass = dev->netdev_ops->ndo_get_lock_subclass(dev);
3601 
3602         spin_lock_nested(&dev->addr_list_lock, subclass);
3603 }
3604 
3605 static inline void netif_addr_lock_bh(struct net_device *dev)
3606 {
3607         spin_lock_bh(&dev->addr_list_lock);
3608 }
3609 
3610 static inline void netif_addr_unlock(struct net_device *dev)
3611 {
3612         spin_unlock(&dev->addr_list_lock);
3613 }
3614 
3615 static inline void netif_addr_unlock_bh(struct net_device *dev)
3616 {
3617         spin_unlock_bh(&dev->addr_list_lock);
3618 }
3619 
3620 /*
3621  * dev_addrs walker. Should be used only for read access. Call with
3622  * rcu_read_lock held.
3623  */
3624 #define for_each_dev_addr(dev, ha) \
3625                 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
3626 
3627 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
3628 
3629 void ether_setup(struct net_device *dev);
3630 
3631 /* Support for loadable net-drivers */
3632 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
3633                                     unsigned char name_assign_type,
3634                                     void (*setup)(struct net_device *),
3635                                     unsigned int txqs, unsigned int rxqs);
3636 #define alloc_netdev(sizeof_priv, name, name_assign_type, setup) \
3637         alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, 1, 1)
3638 
3639 #define alloc_netdev_mq(sizeof_priv, name, name_assign_type, setup, count) \
3640         alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, count, \
3641                          count)
3642 
3643 int register_netdev(struct net_device *dev);
3644 void unregister_netdev(struct net_device *dev);
3645 
3646 /* General hardware address lists handling functions */
3647 int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
3648                    struct netdev_hw_addr_list *from_list, int addr_len);
3649 void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
3650                       struct netdev_hw_addr_list *from_list, int addr_len);
3651 int __hw_addr_sync_dev(struct netdev_hw_addr_list *list,
3652                        struct net_device *dev,
3653                        int (*sync)(struct net_device *, const unsigned char *),
3654                        int (*unsync)(struct net_device *,
3655                                      const unsigned char *));
3656 void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list,
3657                           struct net_device *dev,
3658                           int (*unsync)(struct net_device *,
3659                                         const unsigned char *));
3660 void __hw_addr_init(struct netdev_hw_addr_list *list);
3661 
3662 /* Functions used for device addresses handling */
3663 int dev_addr_add(struct net_device *dev, const unsigned char *addr,
3664                  unsigned char addr_type);
3665 int dev_addr_del(struct net_device *dev, const unsigned char *addr,
3666                  unsigned char addr_type);
3667 void dev_addr_flush(struct net_device *dev);
3668 int dev_addr_init(struct net_device *dev);
3669 
3670 /* Functions used for unicast addresses handling */
3671 int dev_uc_add(struct net_device *dev, const unsigned char *addr);
3672 int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr);
3673 int dev_uc_del(struct net_device *dev, const unsigned char *addr);
3674 int dev_uc_sync(struct net_device *to, struct net_device *from);
3675 int dev_uc_sync_multiple(struct net_device *to, struct net_device *from);
3676 void dev_uc_unsync(struct net_device *to, struct net_device *from);
3677 void dev_uc_flush(struct net_device *dev);
3678 void dev_uc_init(struct net_device *dev);
3679 
3680 /**
3681  *  __dev_uc_sync - Synchonize device's unicast list
3682  *  @dev:  device to sync
3683  *  @sync: function to call if address should be added
3684  *  @unsync: function to call if address should be removed
3685  *
3686  *  Add newly added addresses to the interface, and release
3687  *  addresses that have been deleted.
3688  */
3689 static inline int __dev_uc_sync(struct net_device *dev,
3690                                 int (*sync)(struct net_device *,
3691                                             const unsigned char *),
3692                                 int (*unsync)(struct net_device *,
3693                                               const unsigned char *))
3694 {
3695         return __hw_addr_sync_dev(&dev->uc, dev, sync, unsync);
3696 }
3697 
3698 /**
3699  *  __dev_uc_unsync - Remove synchronized addresses from device
3700  *  @dev:  device to sync
3701  *  @unsync: function to call if address should be removed
3702  *
3703  *  Remove all addresses that were added to the device by dev_uc_sync().
3704  */
3705 static inline void __dev_uc_unsync(struct net_device *dev,
3706                                    int (*unsync)(struct net_device *,
3707                                                  const unsigned char *))
3708 {
3709         __hw_addr_unsync_dev(&dev->uc, dev, unsync);
3710 }
3711 
3712 /* Functions used for multicast addresses handling */
3713 int dev_mc_add(struct net_device *dev, const unsigned char *addr);
3714 int dev_mc_add_global(struct net_device *dev, const unsigned char *addr);
3715 int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr);
3716 int dev_mc_del(struct net_device *dev, const unsigned char *addr);
3717 int dev_mc_del_global(struct net_device *dev, const unsigned char *addr);
3718 int dev_mc_sync(struct net_device *to, struct net_device *from);
3719 int dev_mc_sync_multiple(struct net_device *to, struct net_device *from);
3720 void dev_mc_unsync(struct net_device *to, struct net_device *from);
3721 void dev_mc_flush(struct net_device *dev);
3722 void dev_mc_init(struct net_device *dev);
3723 
3724 /**
3725  *  __dev_mc_sync - Synchonize device's multicast list
3726  *  @dev:  device to sync
3727  *  @sync: function to call if address should be added
3728  *  @unsync: function to call if address should be removed
3729  *
3730  *  Add newly added addresses to the interface, and release
3731  *  addresses that have been deleted.
3732  */
3733 static inline int __dev_mc_sync(struct net_device *dev,
3734                                 int (*sync)(struct net_device *,
3735                                             const unsigned char *),
3736                                 int (*unsync)(struct net_device *,
3737                                               const unsigned char *))
3738 {
3739         return __hw_addr_sync_dev(&dev->mc, dev, sync, unsync);
3740 }
3741 
3742 /**
3743  *  __dev_mc_unsync - Remove synchronized addresses from device
3744  *  @dev:  device to sync
3745  *  @unsync: function to call if address should be removed
3746  *
3747  *  Remove all addresses that were added to the device by dev_mc_sync().
3748  */
3749 static inline void __dev_mc_unsync(struct net_device *dev,
3750                                    int (*unsync)(struct net_device *,
3751                                                  const unsigned char *))
3752 {
3753         __hw_addr_unsync_dev(&dev->mc, dev, unsync);
3754 }
3755 
3756 /* Functions used for secondary unicast and multicast support */
3757 void dev_set_rx_mode(struct net_device *dev);
3758 void __dev_set_rx_mode(struct net_device *dev);
3759 int dev_set_promiscuity(struct net_device *dev, int inc);
3760 int dev_set_allmulti(struct net_device *dev, int inc);
3761 void netdev_state_change(struct net_device *dev);
3762 void netdev_notify_peers(struct net_device *dev);
3763 void netdev_features_change(struct net_device *dev);
3764 /* Load a device via the kmod */
3765 void dev_load(struct net *net, const char *name);
3766 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
3767                                         struct rtnl_link_stats64 *storage);
3768 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
3769                              const struct net_device_stats *netdev_stats);
3770 
3771 extern int              netdev_max_backlog;
3772 extern int              netdev_tstamp_prequeue;
3773 extern int              weight_p;
3774 extern int              bpf_jit_enable;
3775 
3776 bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev);
3777 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
3778                                                      struct list_head **iter);
3779 struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
3780                                                      struct list_head **iter);
3781 
3782 /* iterate through upper list, must be called under RCU read lock */
3783 #define netdev_for_each_upper_dev_rcu(dev, updev, iter) \
3784         for (iter = &(dev)->adj_list.upper, \
3785              updev = netdev_upper_get_next_dev_rcu(dev, &(iter)); \
3786              updev; \
3787              updev = netdev_upper_get_next_dev_rcu(dev, &(iter)))
3788 
3789 /* iterate through upper list, must be called under RCU read lock */
3790 #define netdev_for_each_all_upper_dev_rcu(dev, updev, iter) \
3791         for (iter = &(dev)->all_adj_list.upper, \
3792              updev = netdev_all_upper_get_next_dev_rcu(dev, &(iter)); \
3793              updev; \
3794              updev = netdev_all_upper_get_next_dev_rcu(dev, &(iter)))
3795 
3796 void *netdev_lower_get_next_private(struct net_device *dev,
3797                                     struct list_head **iter);
3798 void *netdev_lower_get_next_private_rcu(struct net_device *dev,
3799                                         struct list_head **iter);
3800 
3801 #define netdev_for_each_lower_private(dev, priv, iter) \
3802         for (iter = (dev)->adj_list.lower.next, \
3803              priv = netdev_lower_get_next_private(dev, &(iter)); \
3804              priv; \
3805              priv = netdev_lower_get_next_private(dev, &(iter)))
3806 
3807 #define netdev_for_each_lower_private_rcu(dev, priv, iter) \
3808         for (iter = &(dev)->adj_list.lower, \
3809              priv = netdev_lower_get_next_private_rcu(dev, &(iter)); \
3810              priv; \
3811              priv = netdev_lower_get_next_private_rcu(dev, &(iter)))
3812 
3813 void *netdev_lower_get_next(struct net_device *dev,
3814                                 struct list_head **iter);
3815 #define netdev_for_each_lower_dev(dev, ldev, iter) \
3816         for (iter = (dev)->adj_list.lower.next, \
3817              ldev = netdev_lower_get_next(dev, &(iter)); \
3818              ldev; \
3819              ldev = netdev_lower_get_next(dev, &(iter)))
3820 
3821 void *netdev_adjacent_get_private(struct list_head *adj_list);
3822 void *netdev_lower_get_first_private_rcu(struct net_device *dev);
3823 struct net_device *netdev_master_upper_dev_get(struct net_device *dev);
3824 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev);
3825 int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev);
3826 int netdev_master_upper_dev_link(struct net_device *dev,
3827                                  struct net_device *upper_dev,
3828                                  void *upper_priv, void *upper_info);
3829 void netdev_upper_dev_unlink(struct net_device *dev,
3830                              struct net_device *upper_dev);
3831 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
3832 void *netdev_lower_dev_get_private(struct net_device *dev,
3833                                    struct net_device *lower_dev);
3834 void netdev_lower_state_changed(struct net_device *lower_dev,
3835                                 void *lower_state_info);
3836 
3837 /* RSS keys are 40 or 52 bytes long */
3838 #define NETDEV_RSS_KEY_LEN 52
3839 extern u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly;
3840 void netdev_rss_key_fill(void *buffer, size_t len);
3841 
3842 int dev_get_nest_level(struct net_device *dev,
3843                        bool (*type_check)(const struct net_device *dev));
3844 int skb_checksum_help(struct sk_buff *skb);
3845 struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
3846                                   netdev_features_t features, bool tx_path);
3847 struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
3848                                     netdev_features_t features);
3849 
3850 struct netdev_bonding_info {
3851         ifslave slave;
3852         ifbond  master;
3853 };
3854 
3855 struct netdev_notifier_bonding_info {
3856         struct netdev_notifier_info info; /* must be first */
3857         struct netdev_bonding_info  bonding_info;
3858 };
3859 
3860 void netdev_bonding_info_change(struct net_device *dev,
3861                                 struct netdev_bonding_info *bonding_info);
3862 
3863 static inline
3864 struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
3865 {
3866         return __skb_gso_segment(skb, features, true);
3867 }
3868 __be16 skb_network_protocol(struct sk_buff *skb, int *depth);
3869 
3870 static inline bool can_checksum_protocol(netdev_features_t features,
3871                                          __be16 protocol)
3872 {
3873         if (protocol == htons(ETH_P_FCOE))
3874                 return !!(features & NETIF_F_FCOE_CRC);
3875 
3876         /* Assume this is an IP checksum (not SCTP CRC) */
3877 
3878         if (features & NETIF_F_HW_CSUM) {
3879                 /* Can checksum everything */
3880                 return true;
3881         }
3882 
3883         switch (protocol) {
3884         case htons(ETH_P_IP):
3885                 return !!(features & NETIF_F_IP_CSUM);
3886         case htons(ETH_P_IPV6):
3887                 return !!(features & NETIF_F_IPV6_CSUM);
3888         default:
3889                 return false;
3890         }
3891 }
3892 
3893 /* Map an ethertype into IP protocol if possible */
3894 static inline int eproto_to_ipproto(int eproto)
3895 {
3896         switch (eproto) {
3897         case htons(ETH_P_IP):
3898                 return IPPROTO_IP;
3899         case htons(ETH_P_IPV6):
3900                 return IPPROTO_IPV6;
3901         default:
3902                 return -1;
3903         }
3904 }
3905 
3906 #ifdef CONFIG_BUG
3907 void netdev_rx_csum_fault(struct net_device *dev);
3908 #else
3909 static inline void netdev_rx_csum_fault(struct net_device *dev)
3910 {
3911 }
3912 #endif
3913 /* rx skb timestamps */
3914 void net_enable_timestamp(void);
3915 void net_disable_timestamp(void);
3916 
3917 #ifdef CONFIG_PROC_FS
3918 int __init dev_proc_init(void);
3919 #else
3920 #define dev_proc_init() 0
3921 #endif
3922 
3923 static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
3924                                               struct sk_buff *skb, struct net_device *dev,
3925                                               bool more)
3926 {
3927         skb->xmit_more = more ? 1 : 0;
3928         return ops->ndo_start_xmit(skb, dev);
3929 }
3930 
3931 static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev,
3932                                             struct netdev_queue *txq, bool more)
3933 {
3934         const struct net_device_ops *ops = dev->netdev_ops;
3935         int rc;
3936 
3937         rc = __netdev_start_xmit(ops, skb, dev, more);
3938         if (rc == NETDEV_TX_OK)
3939                 txq_trans_update(txq);
3940 
3941         return rc;
3942 }
3943 
3944 int netdev_class_create_file_ns(struct class_attribute *class_attr,
3945                                 const void *ns);
3946 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
3947                                  const void *ns);
3948 
3949 static inline int netdev_class_create_file(struct class_attribute *class_attr)
3950 {
3951         return netdev_class_create_file_ns(class_attr, NULL);
3952 }
3953 
3954 static inline void netdev_class_remove_file(struct class_attribute *class_attr)
3955 {
3956         netdev_class_remove_file_ns(class_attr, NULL);
3957 }
3958 
3959 extern struct kobj_ns_type_operations net_ns_type_operations;
3960 
3961 const char *netdev_drivername(const struct net_device *dev);
3962 
3963 void linkwatch_run_queue(void);
3964 
3965 static inline netdev_features_t netdev_intersect_features(netdev_features_t f1,
3966                                                           netdev_features_t f2)
3967 {
3968         if ((f1 ^ f2) & NETIF_F_HW_CSUM) {
3969                 if (f1 & NETIF_F_HW_CSUM)
3970                         f1 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
3971                 else
3972                         f2 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
3973         }
3974 
3975         return f1 & f2;
3976 }
3977 
3978 static inline netdev_features_t netdev_get_wanted_features(
3979         struct net_device *dev)
3980 {
3981         return (dev->features & ~dev->hw_features) | dev->wanted_features;
3982 }
3983 netdev_features_t netdev_increment_features(netdev_features_t all,
3984         netdev_features_t one, netdev_features_t mask);
3985 
3986 /* Allow TSO being used on stacked device :
3987  * Performing the GSO segmentation before last device
3988  * is a performance improvement.
3989  */
3990 static inline netdev_features_t netdev_add_tso_features(netdev_features_t features,
3991                                                         netdev_features_t mask)
3992 {
3993         return netdev_increment_features(features, NETIF_F_ALL_TSO, mask);
3994 }
3995 
3996 int __netdev_update_features(struct net_device *dev);
3997 void netdev_update_features(struct net_device *dev);
3998 void netdev_change_features(struct net_device *dev);
3999 
4000 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4001                                         struct net_device *dev);
4002 
4003 netdev_features_t passthru_features_check(struct sk_buff *skb,
4004                                           struct net_device *dev,
4005                                           netdev_features_t features);
4006 netdev_features_t netif_skb_features(struct sk_buff *skb);
4007 
4008 static inline bool net_gso_ok(netdev_features_t features, int gso_type)
4009 {
4010         netdev_features_t feature = (netdev_features_t)gso_type << NETIF_F_GSO_SHIFT;
4011 
4012         /* check flags correspondence */
4013         BUILD_BUG_ON(SKB_GSO_TCPV4   != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
4014         BUILD_BUG_ON(SKB_GSO_UDP     != (NETIF_F_UFO >> NETIF_F_GSO_SHIFT));
4015         BUILD_BUG_ON(SKB_GSO_DODGY   != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
4016         BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
4017         BUILD_BUG_ON(SKB_GSO_TCPV6   != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
4018         BUILD_BUG_ON(SKB_GSO_FCOE    != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));
4019         BUILD_BUG_ON(SKB_GSO_GRE     != (NETIF_F_GSO_GRE >> NETIF_F_GSO_SHIFT));
4020         BUILD_BUG_ON(SKB_GSO_GRE_CSUM != (NETIF_F_GSO_GRE_CSUM >> NETIF_F_GSO_SHIFT));
4021         BUILD_BUG_ON(SKB_GSO_IPIP    != (NETIF_F_GSO_IPIP >> NETIF_F_GSO_SHIFT));
4022         BUILD_BUG_ON(SKB_GSO_SIT     != (NETIF_F_GSO_SIT >> NETIF_F_GSO_SHIFT));
4023         BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL != (NETIF_F_GSO_UDP_TUNNEL >> NETIF_F_GSO_SHIFT));
4024         BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL_CSUM != (NETIF_F_GSO_UDP_TUNNEL_CSUM >> NETIF_F_GSO_SHIFT));
4025         BUILD_BUG_ON(SKB_GSO_TUNNEL_REMCSUM != (NETIF_F_GSO_TUNNEL_REMCSUM >> NETIF_F_GSO_SHIFT));
4026 
4027         return (features & feature) == feature;
4028 }
4029 
4030 static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
4031 {
4032         return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
4033                (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
4034 }
4035 
4036 static inline bool netif_needs_gso(struct sk_buff *skb,
4037                                    netdev_features_t features)
4038 {
4039         return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
4040                 unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
4041                          (skb->ip_summed != CHECKSUM_UNNECESSARY)));
4042 }
4043 
4044 static inline void netif_set_gso_max_size(struct net_device *dev,
4045                                           unsigned int size)
4046 {
4047         dev->gso_max_size = size;
4048 }
4049 
4050 static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol,
4051                                         int pulled_hlen, u16 mac_offset,
4052                                         int mac_len)
4053 {
4054         skb->protocol = protocol;
4055         skb->encapsulation = 1;
4056         skb_push(skb, pulled_hlen);
4057         skb_reset_transport_header(skb);
4058         skb->mac_header = mac_offset;
4059         skb->network_header = skb->mac_header + mac_len;
4060         skb->mac_len = mac_len;
4061 }
4062 
4063 static inline bool netif_is_macsec(const struct net_device *dev)
4064 {
4065         return dev->priv_flags & IFF_MACSEC;
4066 }
4067 
4068 static inline bool netif_is_macvlan(const struct net_device *dev)
4069 {
4070         return dev->priv_flags & IFF_MACVLAN;
4071 }
4072 
4073 static inline bool netif_is_macvlan_port(const struct net_device *dev)
4074 {
4075         return dev->priv_flags & IFF_MACVLAN_PORT;
4076 }
4077 
4078 static inline bool netif_is_ipvlan(const struct net_device *dev)
4079 {
4080         return dev->priv_flags & IFF_IPVLAN_SLAVE;
4081 }
4082 
4083 static inline bool netif_is_ipvlan_port(const struct net_device *dev)
4084 {
4085         return dev->priv_flags & IFF_IPVLAN_MASTER;
4086 }
4087 
4088 static inline bool netif_is_bond_master(const struct net_device *dev)
4089 {
4090         return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING;
4091 }
4092 
4093 static inline bool netif_is_bond_slave(const struct net_device *dev)
4094 {
4095         return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
4096 }
4097 
4098 static inline bool netif_supports_nofcs(struct net_device *dev)
4099 {
4100         return dev->priv_flags & IFF_SUPP_NOFCS;
4101 }
4102 
4103 static inline bool netif_is_l3_master(const struct net_device *dev)
4104 {
4105         return dev->priv_flags & IFF_L3MDEV_MASTER;
4106 }
4107 
4108 static inline bool netif_is_l3_slave(const struct net_device *dev)
4109 {
4110         return dev->priv_flags & IFF_L3MDEV_SLAVE;
4111 }
4112 
4113 static inline bool netif_is_bridge_master(const struct net_device *dev)
4114 {
4115         return dev->priv_flags & IFF_EBRIDGE;
4116 }
4117 
4118 static inline bool netif_is_bridge_port(const struct net_device *dev)
4119 {
4120         return dev->priv_flags & IFF_BRIDGE_PORT;
4121 }
4122 
4123 static inline bool netif_is_ovs_master(const struct net_device *dev)
4124 {
4125         return dev->priv_flags & IFF_OPENVSWITCH;
4126 }
4127 
4128 static inline bool netif_is_team_master(const struct net_device *dev)
4129 {
4130         return dev->priv_flags & IFF_TEAM;
4131 }
4132 
4133 static inline bool netif_is_team_port(const struct net_device *dev)
4134 {
4135         return dev->priv_flags & IFF_TEAM_PORT;
4136 }
4137 
4138 static inline bool netif_is_lag_master(const struct net_device *dev)
4139 {
4140         return netif_is_bond_master(dev) || netif_is_team_master(dev);
4141 }
4142 
4143 static inline bool netif_is_lag_port(const struct net_device *dev)
4144 {
4145         return netif_is_bond_slave(dev) || netif_is_team_port(dev);
4146 }
4147 
4148 static inline bool netif_is_rxfh_configured(const struct net_device *dev)
4149 {
4150         return dev->priv_flags & IFF_RXFH_CONFIGURED;
4151 }
4152 
4153 /* This device needs to keep skb dst for qdisc enqueue or ndo_start_xmit() */
4154 static inline void netif_keep_dst(struct net_device *dev)
4155 {
4156         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM);
4157 }
4158 
4159 extern struct pernet_operations __net_initdata loopback_net_ops;
4160 
4161 /* Logging, debugging and troubleshooting/diagnostic helpers. */
4162 
4163 /* netdev_printk helpers, similar to dev_printk */
4164 
4165 static inline const char *netdev_name(const struct net_device *dev)
4166 {
4167         if (!dev->name[0] || strchr(dev->name, '%'))
4168                 return "(unnamed net_device)";
4169         return dev->name;
4170 }
4171 
4172 static inline const char *netdev_reg_state(const struct net_device *dev)
4173 {
4174         switch (dev->reg_state) {
4175         case NETREG_UNINITIALIZED: return " (uninitialized)";
4176         case NETREG_REGISTERED: return "";
4177         case NETREG_UNREGISTERING: return " (unregistering)";
4178         case NETREG_UNREGISTERED: return " (unregistered)";
4179         case NETREG_RELEASED: return " (released)";
4180         case NETREG_DUMMY: return " (dummy)";
4181         }
4182 
4183         WARN_ONCE(1, "%s: unknown reg_state %d\n", dev->name, dev->reg_state);
4184         return " (unknown)";
4185 }
4186 
4187 __printf(3, 4)
4188 void netdev_printk(const char *level, const struct net_device *dev,
4189                    const char *format, ...);
4190 __printf(2, 3)
4191 void netdev_emerg(const struct net_device *dev, const char *format, ...);
4192 __printf(2, 3)
4193 void netdev_alert(const struct net_device *dev, const char *format, ...);
4194 __printf(2, 3)
4195 void netdev_crit(const struct net_device *dev, const char *format, ...);
4196 __printf(2, 3)
4197 void netdev_err(const struct net_device *dev, const char *format, ...);
4198 __printf(2, 3)
4199 void netdev_warn(const struct net_device *dev, const char *format, ...);
4200 __printf(2, 3)
4201 void netdev_notice(const struct net_device *dev, const char *format, ...);
4202 __printf(2, 3)
4203 void netdev_info(const struct net_device *dev, const char *format, ...);
4204 
4205 #define MODULE_ALIAS_NETDEV(device) \
4206         MODULE_ALIAS("netdev-" device)
4207 
4208 #if defined(CONFIG_DYNAMIC_DEBUG)
4209 #define netdev_dbg(__dev, format, args...)                      \
4210 do {                                                            \
4211         dynamic_netdev_dbg(__dev, format, ##args);              \
4212 } while (0)
4213 #elif defined(DEBUG)
4214 #define netdev_dbg(__dev, format, args...)                      \
4215         netdev_printk(KERN_DEBUG, __dev, format, ##args)
4216 #else
4217 #define netdev_dbg(__dev, format, args...)                      \
4218 ({                                                              \
4219         if (0)                                                  \
4220                 netdev_printk(KERN_DEBUG, __dev, format, ##args); \
4221 })
4222 #endif
4223 
4224 #if defined(VERBOSE_DEBUG)
4225 #define netdev_vdbg     netdev_dbg
4226 #else
4227 
4228 #define netdev_vdbg(dev, format, args...)                       \
4229 ({                                                              \
4230         if (0)                                                  \
4231                 netdev_printk(KERN_DEBUG, dev, format, ##args); \
4232         0;                                                      \
4233 })
4234 #endif
4235 
4236 /*
4237  * netdev_WARN() acts like dev_printk(), but with the key difference
4238  * of using a WARN/WARN_ON to get the message out, including the
4239  * file/line information and a backtrace.
4240  */
4241 #define netdev_WARN(dev, format, args...)                       \
4242         WARN(1, "netdevice: %s%s\n" format, netdev_name(dev),   \
4243              netdev_reg_state(dev), ##args)
4244 
4245 /* netif printk helpers, similar to netdev_printk */
4246 
4247 #define netif_printk(priv, type, level, dev, fmt, args...)      \
4248 do {                                                            \
4249         if (netif_msg_##type(priv))                             \
4250                 netdev_printk(level, (dev), fmt, ##args);       \
4251 } while (0)
4252 
4253 #define netif_level(level, priv, type, dev, fmt, args...)       \
4254 do {                                                            \
4255         if (netif_msg_##type(priv))                             \
4256                 netdev_##level(dev, fmt, ##args);               \
4257 } while (0)
4258 
4259 #define netif_emerg(priv, type, dev, fmt, args...)              \
4260         netif_level(emerg, priv, type, dev, fmt, ##args)
4261 #define netif_alert(priv, type, dev, fmt, args...)              \
4262         netif_level(alert, priv, type, dev, fmt, ##args)
4263 #define netif_crit(priv, type, dev, fmt, args...)               \
4264         netif_level(crit, priv, type, dev, fmt, ##args)
4265 #define netif_err(priv, type, dev, fmt, args...)                \
4266         netif_level(err, priv, type, dev, fmt, ##args)
4267 #define netif_warn(priv, type, dev, fmt, args...)               \
4268         netif_level(warn, priv, type, dev, fmt, ##args)
4269 #define netif_notice(priv, type, dev, fmt, args...)             \
4270         netif_level(notice, priv, type, dev, fmt, ##args)
4271 #define netif_info(priv, type, dev, fmt, args...)               \
4272         netif_level(info, priv, type, dev, fmt, ##args)
4273 
4274 #if defined(CONFIG_DYNAMIC_DEBUG)
4275 #define netif_dbg(priv, type, netdev, format, args...)          \
4276 do {                                                            \
4277         if (netif_msg_##type(priv))                             \
4278                 dynamic_netdev_dbg(netdev, format, ##args);     \
4279 } while (0)
4280 #elif defined(DEBUG)
4281 #define netif_dbg(priv, type, dev, format, args...)             \
4282         netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
4283 #else
4284 #define netif_dbg(priv, type, dev, format, args...)                     \
4285 ({                                                                      \
4286         if (0)                                                          \
4287                 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
4288         0;                                                              \
4289 })
4290 #endif
4291 
4292 #if defined(VERBOSE_DEBUG)
4293 #define netif_vdbg      netif_dbg
4294 #else
4295 #define netif_vdbg(priv, type, dev, format, args...)            \
4296 ({                                                              \
4297         if (0)                                                  \
4298                 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
4299         0;                                                      \
4300 })
4301 #endif
4302 
4303 /*
4304  *      The list of packet types we will receive (as opposed to discard)
4305  *      and the routines to invoke.
4306  *
4307  *      Why 16. Because with 16 the only overlap we get on a hash of the
4308  *      low nibble of the protocol value is RARP/SNAP/X.25.
4309  *
4310  *      NOTE:  That is no longer true with the addition of VLAN tags.  Not
4311  *             sure which should go first, but I bet it won't make much
4312  *             difference if we are running VLANs.  The good news is that
4313  *             this protocol won't be in the list unless compiled in, so
4314  *             the average user (w/out VLANs) will not be adversely affected.
4315  *             --BLG
4316  *
4317  *              0800    IP
4318  *              8100    802.1Q VLAN
4319  *              0001    802.3
4320  *              0002    AX.25
4321  *              0004    802.2
4322  *              8035    RARP
4323  *              0005    SNAP
4324  *              0805    X.25
4325  *              0806    ARP
4326  *              8137    IPX
4327  *              0009    Localtalk
4328  *              86DD    IPv6
4329  */
4330 #define PTYPE_HASH_SIZE (16)
4331 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
4332 
4333 #endif  /* _LINUX_NETDEVICE_H */
4334 

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