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TOMOYO Linux Cross Reference
Linux/include/linux/netdevice.h

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  1 /*
  2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
  3  *              operating system.  INET is implemented using the  BSD Socket
  4  *              interface as the means of communication with the user level.
  5  *
  6  *              Definitions for the Interfaces handler.
  7  *
  8  * Version:     @(#)dev.h       1.0.10  08/12/93
  9  *
 10  * Authors:     Ross Biro
 11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 12  *              Corey Minyard <wf-rch!minyard@relay.EU.net>
 13  *              Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
 14  *              Alan Cox, <alan@lxorguk.ukuu.org.uk>
 15  *              Bjorn Ekwall. <bj0rn@blox.se>
 16  *              Pekka Riikonen <priikone@poseidon.pspt.fi>
 17  *
 18  *              This program is free software; you can redistribute it and/or
 19  *              modify it under the terms of the GNU General Public License
 20  *              as published by the Free Software Foundation; either version
 21  *              2 of the License, or (at your option) any later version.
 22  *
 23  *              Moved to /usr/include/linux for NET3
 24  */
 25 #ifndef _LINUX_NETDEVICE_H
 26 #define _LINUX_NETDEVICE_H
 27 
 28 #include <linux/if.h>
 29 #include <linux/if_ether.h>
 30 #include <linux/if_packet.h>
 31 #include <linux/if_link.h>
 32 
 33 #ifdef __KERNEL__
 34 #include <linux/pm_qos.h>
 35 #include <linux/timer.h>
 36 #include <linux/bug.h>
 37 #include <linux/delay.h>
 38 #include <linux/atomic.h>
 39 #include <asm/cache.h>
 40 #include <asm/byteorder.h>
 41 
 42 #include <linux/percpu.h>
 43 #include <linux/rculist.h>
 44 #include <linux/dmaengine.h>
 45 #include <linux/workqueue.h>
 46 #include <linux/dynamic_queue_limits.h>
 47 
 48 #include <linux/ethtool.h>
 49 #include <net/net_namespace.h>
 50 #include <net/dsa.h>
 51 #ifdef CONFIG_DCB
 52 #include <net/dcbnl.h>
 53 #endif
 54 #include <net/netprio_cgroup.h>
 55 
 56 #include <linux/netdev_features.h>
 57 
 58 struct netpoll_info;
 59 struct device;
 60 struct phy_device;
 61 /* 802.11 specific */
 62 struct wireless_dev;
 63                                         /* source back-compat hooks */
 64 #define SET_ETHTOOL_OPS(netdev,ops) \
 65         ( (netdev)->ethtool_ops = (ops) )
 66 
 67 /* hardware address assignment types */
 68 #define NET_ADDR_PERM           0       /* address is permanent (default) */
 69 #define NET_ADDR_RANDOM         1       /* address is generated randomly */
 70 #define NET_ADDR_STOLEN         2       /* address is stolen from other device */
 71 
 72 /* Backlog congestion levels */
 73 #define NET_RX_SUCCESS          0       /* keep 'em coming, baby */
 74 #define NET_RX_DROP             1       /* packet dropped */
 75 
 76 /*
 77  * Transmit return codes: transmit return codes originate from three different
 78  * namespaces:
 79  *
 80  * - qdisc return codes
 81  * - driver transmit return codes
 82  * - errno values
 83  *
 84  * Drivers are allowed to return any one of those in their hard_start_xmit()
 85  * function. Real network devices commonly used with qdiscs should only return
 86  * the driver transmit return codes though - when qdiscs are used, the actual
 87  * transmission happens asynchronously, so the value is not propagated to
 88  * higher layers. Virtual network devices transmit synchronously, in this case
 89  * the driver transmit return codes are consumed by dev_queue_xmit(), all
 90  * others are propagated to higher layers.
 91  */
 92 
 93 /* qdisc ->enqueue() return codes. */
 94 #define NET_XMIT_SUCCESS        0x00
 95 #define NET_XMIT_DROP           0x01    /* skb dropped                  */
 96 #define NET_XMIT_CN             0x02    /* congestion notification      */
 97 #define NET_XMIT_POLICED        0x03    /* skb is shot by police        */
 98 #define NET_XMIT_MASK           0x0f    /* qdisc flags in net/sch_generic.h */
 99 
100 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
101  * indicates that the device will soon be dropping packets, or already drops
102  * some packets of the same priority; prompting us to send less aggressively. */
103 #define net_xmit_eval(e)        ((e) == NET_XMIT_CN ? 0 : (e))
104 #define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
105 
106 /* Driver transmit return codes */
107 #define NETDEV_TX_MASK          0xf0
108 
109 enum netdev_tx {
110         __NETDEV_TX_MIN  = INT_MIN,     /* make sure enum is signed */
111         NETDEV_TX_OK     = 0x00,        /* driver took care of packet */
112         NETDEV_TX_BUSY   = 0x10,        /* driver tx path was busy*/
113         NETDEV_TX_LOCKED = 0x20,        /* driver tx lock was already taken */
114 };
115 typedef enum netdev_tx netdev_tx_t;
116 
117 /*
118  * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
119  * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
120  */
121 static inline bool dev_xmit_complete(int rc)
122 {
123         /*
124          * Positive cases with an skb consumed by a driver:
125          * - successful transmission (rc == NETDEV_TX_OK)
126          * - error while transmitting (rc < 0)
127          * - error while queueing to a different device (rc & NET_XMIT_MASK)
128          */
129         if (likely(rc < NET_XMIT_MASK))
130                 return true;
131 
132         return false;
133 }
134 
135 #endif
136 
137 #define MAX_ADDR_LEN    32              /* Largest hardware address length */
138 
139 /* Initial net device group. All devices belong to group 0 by default. */
140 #define INIT_NETDEV_GROUP       0
141 
142 #ifdef  __KERNEL__
143 /*
144  *      Compute the worst case header length according to the protocols
145  *      used.
146  */
147 
148 #if defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
149 # if defined(CONFIG_MAC80211_MESH)
150 #  define LL_MAX_HEADER 128
151 # else
152 #  define LL_MAX_HEADER 96
153 # endif
154 #elif IS_ENABLED(CONFIG_TR)
155 # define LL_MAX_HEADER 48
156 #else
157 # define LL_MAX_HEADER 32
158 #endif
159 
160 #if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \
161     !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL)
162 #define MAX_HEADER LL_MAX_HEADER
163 #else
164 #define MAX_HEADER (LL_MAX_HEADER + 48)
165 #endif
166 
167 /*
168  *      Old network device statistics. Fields are native words
169  *      (unsigned long) so they can be read and written atomically.
170  */
171 
172 struct net_device_stats {
173         unsigned long   rx_packets;
174         unsigned long   tx_packets;
175         unsigned long   rx_bytes;
176         unsigned long   tx_bytes;
177         unsigned long   rx_errors;
178         unsigned long   tx_errors;
179         unsigned long   rx_dropped;
180         unsigned long   tx_dropped;
181         unsigned long   multicast;
182         unsigned long   collisions;
183         unsigned long   rx_length_errors;
184         unsigned long   rx_over_errors;
185         unsigned long   rx_crc_errors;
186         unsigned long   rx_frame_errors;
187         unsigned long   rx_fifo_errors;
188         unsigned long   rx_missed_errors;
189         unsigned long   tx_aborted_errors;
190         unsigned long   tx_carrier_errors;
191         unsigned long   tx_fifo_errors;
192         unsigned long   tx_heartbeat_errors;
193         unsigned long   tx_window_errors;
194         unsigned long   rx_compressed;
195         unsigned long   tx_compressed;
196 };
197 
198 #endif  /*  __KERNEL__  */
199 
200 
201 /* Media selection options. */
202 enum {
203         IF_PORT_UNKNOWN = 0,
204         IF_PORT_10BASE2,
205         IF_PORT_10BASET,
206         IF_PORT_AUI,
207         IF_PORT_100BASET,
208         IF_PORT_100BASETX,
209         IF_PORT_100BASEFX
210 };
211 
212 #ifdef __KERNEL__
213 
214 #include <linux/cache.h>
215 #include <linux/skbuff.h>
216 
217 #ifdef CONFIG_RPS
218 #include <linux/static_key.h>
219 extern struct static_key rps_needed;
220 #endif
221 
222 struct neighbour;
223 struct neigh_parms;
224 struct sk_buff;
225 
226 struct netdev_hw_addr {
227         struct list_head        list;
228         unsigned char           addr[MAX_ADDR_LEN];
229         unsigned char           type;
230 #define NETDEV_HW_ADDR_T_LAN            1
231 #define NETDEV_HW_ADDR_T_SAN            2
232 #define NETDEV_HW_ADDR_T_SLAVE          3
233 #define NETDEV_HW_ADDR_T_UNICAST        4
234 #define NETDEV_HW_ADDR_T_MULTICAST      5
235         bool                    global_use;
236         int                     refcount;
237         int                     synced;
238         struct rcu_head         rcu_head;
239 };
240 
241 struct netdev_hw_addr_list {
242         struct list_head        list;
243         int                     count;
244 };
245 
246 #define netdev_hw_addr_list_count(l) ((l)->count)
247 #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
248 #define netdev_hw_addr_list_for_each(ha, l) \
249         list_for_each_entry(ha, &(l)->list, list)
250 
251 #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
252 #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
253 #define netdev_for_each_uc_addr(ha, dev) \
254         netdev_hw_addr_list_for_each(ha, &(dev)->uc)
255 
256 #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
257 #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
258 #define netdev_for_each_mc_addr(ha, dev) \
259         netdev_hw_addr_list_for_each(ha, &(dev)->mc)
260 
261 struct hh_cache {
262         u16             hh_len;
263         u16             __pad;
264         seqlock_t       hh_lock;
265 
266         /* cached hardware header; allow for machine alignment needs.        */
267 #define HH_DATA_MOD     16
268 #define HH_DATA_OFF(__len) \
269         (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
270 #define HH_DATA_ALIGN(__len) \
271         (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
272         unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
273 };
274 
275 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
276  * Alternative is:
277  *   dev->hard_header_len ? (dev->hard_header_len +
278  *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
279  *
280  * We could use other alignment values, but we must maintain the
281  * relationship HH alignment <= LL alignment.
282  */
283 #define LL_RESERVED_SPACE(dev) \
284         ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
285 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
286         ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
287 
288 struct header_ops {
289         int     (*create) (struct sk_buff *skb, struct net_device *dev,
290                            unsigned short type, const void *daddr,
291                            const void *saddr, unsigned len);
292         int     (*parse)(const struct sk_buff *skb, unsigned char *haddr);
293         int     (*rebuild)(struct sk_buff *skb);
294         int     (*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type);
295         void    (*cache_update)(struct hh_cache *hh,
296                                 const struct net_device *dev,
297                                 const unsigned char *haddr);
298 };
299 
300 /* These flag bits are private to the generic network queueing
301  * layer, they may not be explicitly referenced by any other
302  * code.
303  */
304 
305 enum netdev_state_t {
306         __LINK_STATE_START,
307         __LINK_STATE_PRESENT,
308         __LINK_STATE_NOCARRIER,
309         __LINK_STATE_LINKWATCH_PENDING,
310         __LINK_STATE_DORMANT,
311 };
312 
313 
314 /*
315  * This structure holds at boot time configured netdevice settings. They
316  * are then used in the device probing.
317  */
318 struct netdev_boot_setup {
319         char name[IFNAMSIZ];
320         struct ifmap map;
321 };
322 #define NETDEV_BOOT_SETUP_MAX 8
323 
324 extern int __init netdev_boot_setup(char *str);
325 
326 /*
327  * Structure for NAPI scheduling similar to tasklet but with weighting
328  */
329 struct napi_struct {
330         /* The poll_list must only be managed by the entity which
331          * changes the state of the NAPI_STATE_SCHED bit.  This means
332          * whoever atomically sets that bit can add this napi_struct
333          * to the per-cpu poll_list, and whoever clears that bit
334          * can remove from the list right before clearing the bit.
335          */
336         struct list_head        poll_list;
337 
338         unsigned long           state;
339         int                     weight;
340         int                     (*poll)(struct napi_struct *, int);
341 #ifdef CONFIG_NETPOLL
342         spinlock_t              poll_lock;
343         int                     poll_owner;
344 #endif
345 
346         unsigned int            gro_count;
347 
348         struct net_device       *dev;
349         struct list_head        dev_list;
350         struct sk_buff          *gro_list;
351         struct sk_buff          *skb;
352 };
353 
354 enum {
355         NAPI_STATE_SCHED,       /* Poll is scheduled */
356         NAPI_STATE_DISABLE,     /* Disable pending */
357         NAPI_STATE_NPSVC,       /* Netpoll - don't dequeue from poll_list */
358 };
359 
360 enum gro_result {
361         GRO_MERGED,
362         GRO_MERGED_FREE,
363         GRO_HELD,
364         GRO_NORMAL,
365         GRO_DROP,
366 };
367 typedef enum gro_result gro_result_t;
368 
369 /*
370  * enum rx_handler_result - Possible return values for rx_handlers.
371  * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
372  * further.
373  * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
374  * case skb->dev was changed by rx_handler.
375  * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
376  * @RX_HANDLER_PASS: Do nothing, passe the skb as if no rx_handler was called.
377  *
378  * rx_handlers are functions called from inside __netif_receive_skb(), to do
379  * special processing of the skb, prior to delivery to protocol handlers.
380  *
381  * Currently, a net_device can only have a single rx_handler registered. Trying
382  * to register a second rx_handler will return -EBUSY.
383  *
384  * To register a rx_handler on a net_device, use netdev_rx_handler_register().
385  * To unregister a rx_handler on a net_device, use
386  * netdev_rx_handler_unregister().
387  *
388  * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
389  * do with the skb.
390  *
391  * If the rx_handler consumed to skb in some way, it should return
392  * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
393  * the skb to be delivered in some other ways.
394  *
395  * If the rx_handler changed skb->dev, to divert the skb to another
396  * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
397  * new device will be called if it exists.
398  *
399  * If the rx_handler consider the skb should be ignored, it should return
400  * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
401  * are registred on exact device (ptype->dev == skb->dev).
402  *
403  * If the rx_handler didn't changed skb->dev, but want the skb to be normally
404  * delivered, it should return RX_HANDLER_PASS.
405  *
406  * A device without a registered rx_handler will behave as if rx_handler
407  * returned RX_HANDLER_PASS.
408  */
409 
410 enum rx_handler_result {
411         RX_HANDLER_CONSUMED,
412         RX_HANDLER_ANOTHER,
413         RX_HANDLER_EXACT,
414         RX_HANDLER_PASS,
415 };
416 typedef enum rx_handler_result rx_handler_result_t;
417 typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
418 
419 extern void __napi_schedule(struct napi_struct *n);
420 
421 static inline bool napi_disable_pending(struct napi_struct *n)
422 {
423         return test_bit(NAPI_STATE_DISABLE, &n->state);
424 }
425 
426 /**
427  *      napi_schedule_prep - check if napi can be scheduled
428  *      @n: napi context
429  *
430  * Test if NAPI routine is already running, and if not mark
431  * it as running.  This is used as a condition variable
432  * insure only one NAPI poll instance runs.  We also make
433  * sure there is no pending NAPI disable.
434  */
435 static inline bool napi_schedule_prep(struct napi_struct *n)
436 {
437         return !napi_disable_pending(n) &&
438                 !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
439 }
440 
441 /**
442  *      napi_schedule - schedule NAPI poll
443  *      @n: napi context
444  *
445  * Schedule NAPI poll routine to be called if it is not already
446  * running.
447  */
448 static inline void napi_schedule(struct napi_struct *n)
449 {
450         if (napi_schedule_prep(n))
451                 __napi_schedule(n);
452 }
453 
454 /* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
455 static inline bool napi_reschedule(struct napi_struct *napi)
456 {
457         if (napi_schedule_prep(napi)) {
458                 __napi_schedule(napi);
459                 return true;
460         }
461         return false;
462 }
463 
464 /**
465  *      napi_complete - NAPI processing complete
466  *      @n: napi context
467  *
468  * Mark NAPI processing as complete.
469  */
470 extern void __napi_complete(struct napi_struct *n);
471 extern void napi_complete(struct napi_struct *n);
472 
473 /**
474  *      napi_disable - prevent NAPI from scheduling
475  *      @n: napi context
476  *
477  * Stop NAPI from being scheduled on this context.
478  * Waits till any outstanding processing completes.
479  */
480 static inline void napi_disable(struct napi_struct *n)
481 {
482         set_bit(NAPI_STATE_DISABLE, &n->state);
483         while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
484                 msleep(1);
485         clear_bit(NAPI_STATE_DISABLE, &n->state);
486 }
487 
488 /**
489  *      napi_enable - enable NAPI scheduling
490  *      @n: napi context
491  *
492  * Resume NAPI from being scheduled on this context.
493  * Must be paired with napi_disable.
494  */
495 static inline void napi_enable(struct napi_struct *n)
496 {
497         BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
498         smp_mb__before_clear_bit();
499         clear_bit(NAPI_STATE_SCHED, &n->state);
500 }
501 
502 #ifdef CONFIG_SMP
503 /**
504  *      napi_synchronize - wait until NAPI is not running
505  *      @n: napi context
506  *
507  * Wait until NAPI is done being scheduled on this context.
508  * Waits till any outstanding processing completes but
509  * does not disable future activations.
510  */
511 static inline void napi_synchronize(const struct napi_struct *n)
512 {
513         while (test_bit(NAPI_STATE_SCHED, &n->state))
514                 msleep(1);
515 }
516 #else
517 # define napi_synchronize(n)    barrier()
518 #endif
519 
520 enum netdev_queue_state_t {
521         __QUEUE_STATE_DRV_XOFF,
522         __QUEUE_STATE_STACK_XOFF,
523         __QUEUE_STATE_FROZEN,
524 #define QUEUE_STATE_ANY_XOFF ((1 << __QUEUE_STATE_DRV_XOFF)             | \
525                               (1 << __QUEUE_STATE_STACK_XOFF))
526 #define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF            | \
527                                         (1 << __QUEUE_STATE_FROZEN))
528 };
529 /*
530  * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue.  The
531  * netif_tx_* functions below are used to manipulate this flag.  The
532  * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
533  * queue independently.  The netif_xmit_*stopped functions below are called
534  * to check if the queue has been stopped by the driver or stack (either
535  * of the XOFF bits are set in the state).  Drivers should not need to call
536  * netif_xmit*stopped functions, they should only be using netif_tx_*.
537  */
538 
539 struct netdev_queue {
540 /*
541  * read mostly part
542  */
543         struct net_device       *dev;
544         struct Qdisc            *qdisc;
545         struct Qdisc            *qdisc_sleeping;
546 #ifdef CONFIG_SYSFS
547         struct kobject          kobj;
548 #endif
549 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
550         int                     numa_node;
551 #endif
552 /*
553  * write mostly part
554  */
555         spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
556         int                     xmit_lock_owner;
557         /*
558          * please use this field instead of dev->trans_start
559          */
560         unsigned long           trans_start;
561 
562         /*
563          * Number of TX timeouts for this queue
564          * (/sys/class/net/DEV/Q/trans_timeout)
565          */
566         unsigned long           trans_timeout;
567 
568         unsigned long           state;
569 
570 #ifdef CONFIG_BQL
571         struct dql              dql;
572 #endif
573 } ____cacheline_aligned_in_smp;
574 
575 static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
576 {
577 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
578         return q->numa_node;
579 #else
580         return NUMA_NO_NODE;
581 #endif
582 }
583 
584 static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
585 {
586 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
587         q->numa_node = node;
588 #endif
589 }
590 
591 #ifdef CONFIG_RPS
592 /*
593  * This structure holds an RPS map which can be of variable length.  The
594  * map is an array of CPUs.
595  */
596 struct rps_map {
597         unsigned int len;
598         struct rcu_head rcu;
599         u16 cpus[0];
600 };
601 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
602 
603 /*
604  * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
605  * tail pointer for that CPU's input queue at the time of last enqueue, and
606  * a hardware filter index.
607  */
608 struct rps_dev_flow {
609         u16 cpu;
610         u16 filter;
611         unsigned int last_qtail;
612 };
613 #define RPS_NO_FILTER 0xffff
614 
615 /*
616  * The rps_dev_flow_table structure contains a table of flow mappings.
617  */
618 struct rps_dev_flow_table {
619         unsigned int mask;
620         struct rcu_head rcu;
621         struct work_struct free_work;
622         struct rps_dev_flow flows[0];
623 };
624 #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
625     ((_num) * sizeof(struct rps_dev_flow)))
626 
627 /*
628  * The rps_sock_flow_table contains mappings of flows to the last CPU
629  * on which they were processed by the application (set in recvmsg).
630  */
631 struct rps_sock_flow_table {
632         unsigned int mask;
633         u16 ents[0];
634 };
635 #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \
636     ((_num) * sizeof(u16)))
637 
638 #define RPS_NO_CPU 0xffff
639 
640 static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
641                                         u32 hash)
642 {
643         if (table && hash) {
644                 unsigned int cpu, index = hash & table->mask;
645 
646                 /* We only give a hint, preemption can change cpu under us */
647                 cpu = raw_smp_processor_id();
648 
649                 if (table->ents[index] != cpu)
650                         table->ents[index] = cpu;
651         }
652 }
653 
654 static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table,
655                                        u32 hash)
656 {
657         if (table && hash)
658                 table->ents[hash & table->mask] = RPS_NO_CPU;
659 }
660 
661 extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
662 
663 #ifdef CONFIG_RFS_ACCEL
664 extern bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
665                                 u32 flow_id, u16 filter_id);
666 #endif
667 
668 /* This structure contains an instance of an RX queue. */
669 struct netdev_rx_queue {
670         struct rps_map __rcu            *rps_map;
671         struct rps_dev_flow_table __rcu *rps_flow_table;
672         struct kobject                  kobj;
673         struct net_device               *dev;
674 } ____cacheline_aligned_in_smp;
675 #endif /* CONFIG_RPS */
676 
677 #ifdef CONFIG_XPS
678 /*
679  * This structure holds an XPS map which can be of variable length.  The
680  * map is an array of queues.
681  */
682 struct xps_map {
683         unsigned int len;
684         unsigned int alloc_len;
685         struct rcu_head rcu;
686         u16 queues[0];
687 };
688 #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
689 #define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map))    \
690     / sizeof(u16))
691 
692 /*
693  * This structure holds all XPS maps for device.  Maps are indexed by CPU.
694  */
695 struct xps_dev_maps {
696         struct rcu_head rcu;
697         struct xps_map __rcu *cpu_map[0];
698 };
699 #define XPS_DEV_MAPS_SIZE (sizeof(struct xps_dev_maps) +                \
700     (nr_cpu_ids * sizeof(struct xps_map *)))
701 #endif /* CONFIG_XPS */
702 
703 #define TC_MAX_QUEUE    16
704 #define TC_BITMASK      15
705 /* HW offloaded queuing disciplines txq count and offset maps */
706 struct netdev_tc_txq {
707         u16 count;
708         u16 offset;
709 };
710 
711 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
712 /*
713  * This structure is to hold information about the device
714  * configured to run FCoE protocol stack.
715  */
716 struct netdev_fcoe_hbainfo {
717         char    manufacturer[64];
718         char    serial_number[64];
719         char    hardware_version[64];
720         char    driver_version[64];
721         char    optionrom_version[64];
722         char    firmware_version[64];
723         char    model[256];
724         char    model_description[256];
725 };
726 #endif
727 
728 /*
729  * This structure defines the management hooks for network devices.
730  * The following hooks can be defined; unless noted otherwise, they are
731  * optional and can be filled with a null pointer.
732  *
733  * int (*ndo_init)(struct net_device *dev);
734  *     This function is called once when network device is registered.
735  *     The network device can use this to any late stage initializaton
736  *     or semantic validattion. It can fail with an error code which will
737  *     be propogated back to register_netdev
738  *
739  * void (*ndo_uninit)(struct net_device *dev);
740  *     This function is called when device is unregistered or when registration
741  *     fails. It is not called if init fails.
742  *
743  * int (*ndo_open)(struct net_device *dev);
744  *     This function is called when network device transistions to the up
745  *     state.
746  *
747  * int (*ndo_stop)(struct net_device *dev);
748  *     This function is called when network device transistions to the down
749  *     state.
750  *
751  * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
752  *                               struct net_device *dev);
753  *      Called when a packet needs to be transmitted.
754  *      Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
755  *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
756  *      Required can not be NULL.
757  *
758  * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
759  *      Called to decide which queue to when device supports multiple
760  *      transmit queues.
761  *
762  * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
763  *      This function is called to allow device receiver to make
764  *      changes to configuration when multicast or promiscious is enabled.
765  *
766  * void (*ndo_set_rx_mode)(struct net_device *dev);
767  *      This function is called device changes address list filtering.
768  *      If driver handles unicast address filtering, it should set
769  *      IFF_UNICAST_FLT to its priv_flags.
770  *
771  * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
772  *      This function  is called when the Media Access Control address
773  *      needs to be changed. If this interface is not defined, the
774  *      mac address can not be changed.
775  *
776  * int (*ndo_validate_addr)(struct net_device *dev);
777  *      Test if Media Access Control address is valid for the device.
778  *
779  * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
780  *      Called when a user request an ioctl which can't be handled by
781  *      the generic interface code. If not defined ioctl's return
782  *      not supported error code.
783  *
784  * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
785  *      Used to set network devices bus interface parameters. This interface
786  *      is retained for legacy reason, new devices should use the bus
787  *      interface (PCI) for low level management.
788  *
789  * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
790  *      Called when a user wants to change the Maximum Transfer Unit
791  *      of a device. If not defined, any request to change MTU will
792  *      will return an error.
793  *
794  * void (*ndo_tx_timeout)(struct net_device *dev);
795  *      Callback uses when the transmitter has not made any progress
796  *      for dev->watchdog ticks.
797  *
798  * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
799  *                      struct rtnl_link_stats64 *storage);
800  * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
801  *      Called when a user wants to get the network device usage
802  *      statistics. Drivers must do one of the following:
803  *      1. Define @ndo_get_stats64 to fill in a zero-initialised
804  *         rtnl_link_stats64 structure passed by the caller.
805  *      2. Define @ndo_get_stats to update a net_device_stats structure
806  *         (which should normally be dev->stats) and return a pointer to
807  *         it. The structure may be changed asynchronously only if each
808  *         field is written atomically.
809  *      3. Update dev->stats asynchronously and atomically, and define
810  *         neither operation.
811  *
812  * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
813  *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
814  *      this function is called when a VLAN id is registered.
815  *
816  * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
817  *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
818  *      this function is called when a VLAN id is unregistered.
819  *
820  * void (*ndo_poll_controller)(struct net_device *dev);
821  *
822  *      SR-IOV management functions.
823  * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
824  * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
825  * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
826  * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
827  * int (*ndo_get_vf_config)(struct net_device *dev,
828  *                          int vf, struct ifla_vf_info *ivf);
829  * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
830  *                        struct nlattr *port[]);
831  * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
832  * int (*ndo_setup_tc)(struct net_device *dev, u8 tc)
833  *      Called to setup 'tc' number of traffic classes in the net device. This
834  *      is always called from the stack with the rtnl lock held and netif tx
835  *      queues stopped. This allows the netdevice to perform queue management
836  *      safely.
837  *
838  *      Fiber Channel over Ethernet (FCoE) offload functions.
839  * int (*ndo_fcoe_enable)(struct net_device *dev);
840  *      Called when the FCoE protocol stack wants to start using LLD for FCoE
841  *      so the underlying device can perform whatever needed configuration or
842  *      initialization to support acceleration of FCoE traffic.
843  *
844  * int (*ndo_fcoe_disable)(struct net_device *dev);
845  *      Called when the FCoE protocol stack wants to stop using LLD for FCoE
846  *      so the underlying device can perform whatever needed clean-ups to
847  *      stop supporting acceleration of FCoE traffic.
848  *
849  * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid,
850  *                           struct scatterlist *sgl, unsigned int sgc);
851  *      Called when the FCoE Initiator wants to initialize an I/O that
852  *      is a possible candidate for Direct Data Placement (DDP). The LLD can
853  *      perform necessary setup and returns 1 to indicate the device is set up
854  *      successfully to perform DDP on this I/O, otherwise this returns 0.
855  *
856  * int (*ndo_fcoe_ddp_done)(struct net_device *dev,  u16 xid);
857  *      Called when the FCoE Initiator/Target is done with the DDPed I/O as
858  *      indicated by the FC exchange id 'xid', so the underlying device can
859  *      clean up and reuse resources for later DDP requests.
860  *
861  * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid,
862  *                            struct scatterlist *sgl, unsigned int sgc);
863  *      Called when the FCoE Target wants to initialize an I/O that
864  *      is a possible candidate for Direct Data Placement (DDP). The LLD can
865  *      perform necessary setup and returns 1 to indicate the device is set up
866  *      successfully to perform DDP on this I/O, otherwise this returns 0.
867  *
868  * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
869  *                             struct netdev_fcoe_hbainfo *hbainfo);
870  *      Called when the FCoE Protocol stack wants information on the underlying
871  *      device. This information is utilized by the FCoE protocol stack to
872  *      register attributes with Fiber Channel management service as per the
873  *      FC-GS Fabric Device Management Information(FDMI) specification.
874  *
875  * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type);
876  *      Called when the underlying device wants to override default World Wide
877  *      Name (WWN) generation mechanism in FCoE protocol stack to pass its own
878  *      World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE
879  *      protocol stack to use.
880  *
881  *      RFS acceleration.
882  * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb,
883  *                          u16 rxq_index, u32 flow_id);
884  *      Set hardware filter for RFS.  rxq_index is the target queue index;
885  *      flow_id is a flow ID to be passed to rps_may_expire_flow() later.
886  *      Return the filter ID on success, or a negative error code.
887  *
888  *      Slave management functions (for bridge, bonding, etc). User should
889  *      call netdev_set_master() to set dev->master properly.
890  * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
891  *      Called to make another netdev an underling.
892  *
893  * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
894  *      Called to release previously enslaved netdev.
895  *
896  *      Feature/offload setting functions.
897  * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
898  *              netdev_features_t features);
899  *      Adjusts the requested feature flags according to device-specific
900  *      constraints, and returns the resulting flags. Must not modify
901  *      the device state.
902  *
903  * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
904  *      Called to update device configuration to new features. Passed
905  *      feature set might be less than what was returned by ndo_fix_features()).
906  *      Must return >0 or -errno if it changed dev->features itself.
907  *
908  */
909 struct net_device_ops {
910         int                     (*ndo_init)(struct net_device *dev);
911         void                    (*ndo_uninit)(struct net_device *dev);
912         int                     (*ndo_open)(struct net_device *dev);
913         int                     (*ndo_stop)(struct net_device *dev);
914         netdev_tx_t             (*ndo_start_xmit) (struct sk_buff *skb,
915                                                    struct net_device *dev);
916         u16                     (*ndo_select_queue)(struct net_device *dev,
917                                                     struct sk_buff *skb);
918         void                    (*ndo_change_rx_flags)(struct net_device *dev,
919                                                        int flags);
920         void                    (*ndo_set_rx_mode)(struct net_device *dev);
921         int                     (*ndo_set_mac_address)(struct net_device *dev,
922                                                        void *addr);
923         int                     (*ndo_validate_addr)(struct net_device *dev);
924         int                     (*ndo_do_ioctl)(struct net_device *dev,
925                                                 struct ifreq *ifr, int cmd);
926         int                     (*ndo_set_config)(struct net_device *dev,
927                                                   struct ifmap *map);
928         int                     (*ndo_change_mtu)(struct net_device *dev,
929                                                   int new_mtu);
930         int                     (*ndo_neigh_setup)(struct net_device *dev,
931                                                    struct neigh_parms *);
932         void                    (*ndo_tx_timeout) (struct net_device *dev);
933 
934         struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
935                                                      struct rtnl_link_stats64 *storage);
936         struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
937 
938         int                     (*ndo_vlan_rx_add_vid)(struct net_device *dev,
939                                                        unsigned short vid);
940         int                     (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
941                                                         unsigned short vid);
942 #ifdef CONFIG_NET_POLL_CONTROLLER
943         void                    (*ndo_poll_controller)(struct net_device *dev);
944         int                     (*ndo_netpoll_setup)(struct net_device *dev,
945                                                      struct netpoll_info *info);
946         void                    (*ndo_netpoll_cleanup)(struct net_device *dev);
947 #endif
948         int                     (*ndo_set_vf_mac)(struct net_device *dev,
949                                                   int queue, u8 *mac);
950         int                     (*ndo_set_vf_vlan)(struct net_device *dev,
951                                                    int queue, u16 vlan, u8 qos);
952         int                     (*ndo_set_vf_tx_rate)(struct net_device *dev,
953                                                       int vf, int rate);
954         int                     (*ndo_set_vf_spoofchk)(struct net_device *dev,
955                                                        int vf, bool setting);
956         int                     (*ndo_get_vf_config)(struct net_device *dev,
957                                                      int vf,
958                                                      struct ifla_vf_info *ivf);
959         int                     (*ndo_set_vf_port)(struct net_device *dev,
960                                                    int vf,
961                                                    struct nlattr *port[]);
962         int                     (*ndo_get_vf_port)(struct net_device *dev,
963                                                    int vf, struct sk_buff *skb);
964         int                     (*ndo_setup_tc)(struct net_device *dev, u8 tc);
965 #if IS_ENABLED(CONFIG_FCOE)
966         int                     (*ndo_fcoe_enable)(struct net_device *dev);
967         int                     (*ndo_fcoe_disable)(struct net_device *dev);
968         int                     (*ndo_fcoe_ddp_setup)(struct net_device *dev,
969                                                       u16 xid,
970                                                       struct scatterlist *sgl,
971                                                       unsigned int sgc);
972         int                     (*ndo_fcoe_ddp_done)(struct net_device *dev,
973                                                      u16 xid);
974         int                     (*ndo_fcoe_ddp_target)(struct net_device *dev,
975                                                        u16 xid,
976                                                        struct scatterlist *sgl,
977                                                        unsigned int sgc);
978         int                     (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
979                                                         struct netdev_fcoe_hbainfo *hbainfo);
980 #endif
981 
982 #if IS_ENABLED(CONFIG_LIBFCOE)
983 #define NETDEV_FCOE_WWNN 0
984 #define NETDEV_FCOE_WWPN 1
985         int                     (*ndo_fcoe_get_wwn)(struct net_device *dev,
986                                                     u64 *wwn, int type);
987 #endif
988 
989 #ifdef CONFIG_RFS_ACCEL
990         int                     (*ndo_rx_flow_steer)(struct net_device *dev,
991                                                      const struct sk_buff *skb,
992                                                      u16 rxq_index,
993                                                      u32 flow_id);
994 #endif
995         int                     (*ndo_add_slave)(struct net_device *dev,
996                                                  struct net_device *slave_dev);
997         int                     (*ndo_del_slave)(struct net_device *dev,
998                                                  struct net_device *slave_dev);
999         netdev_features_t       (*ndo_fix_features)(struct net_device *dev,
1000                                                     netdev_features_t features);
1001         int                     (*ndo_set_features)(struct net_device *dev,
1002                                                     netdev_features_t features);
1003         int                     (*ndo_neigh_construct)(struct neighbour *n);
1004         void                    (*ndo_neigh_destroy)(struct neighbour *n);
1005 };
1006 
1007 /*
1008  *      The DEVICE structure.
1009  *      Actually, this whole structure is a big mistake.  It mixes I/O
1010  *      data with strictly "high-level" data, and it has to know about
1011  *      almost every data structure used in the INET module.
1012  *
1013  *      FIXME: cleanup struct net_device such that network protocol info
1014  *      moves out.
1015  */
1016 
1017 struct net_device {
1018 
1019         /*
1020          * This is the first field of the "visible" part of this structure
1021          * (i.e. as seen by users in the "Space.c" file).  It is the name
1022          * of the interface.
1023          */
1024         char                    name[IFNAMSIZ];
1025 
1026         struct pm_qos_request   pm_qos_req;
1027 
1028         /* device name hash chain */
1029         struct hlist_node       name_hlist;
1030         /* snmp alias */
1031         char                    *ifalias;
1032 
1033         /*
1034          *      I/O specific fields
1035          *      FIXME: Merge these and struct ifmap into one
1036          */
1037         unsigned long           mem_end;        /* shared mem end       */
1038         unsigned long           mem_start;      /* shared mem start     */
1039         unsigned long           base_addr;      /* device I/O address   */
1040         unsigned int            irq;            /* device IRQ number    */
1041 
1042         /*
1043          *      Some hardware also needs these fields, but they are not
1044          *      part of the usual set specified in Space.c.
1045          */
1046 
1047         unsigned long           state;
1048 
1049         struct list_head        dev_list;
1050         struct list_head        napi_list;
1051         struct list_head        unreg_list;
1052 
1053         /* currently active device features */
1054         netdev_features_t       features;
1055         /* user-changeable features */
1056         netdev_features_t       hw_features;
1057         /* user-requested features */
1058         netdev_features_t       wanted_features;
1059         /* mask of features inheritable by VLAN devices */
1060         netdev_features_t       vlan_features;
1061 
1062         /* Interface index. Unique device identifier    */
1063         int                     ifindex;
1064         int                     iflink;
1065 
1066         struct net_device_stats stats;
1067         atomic_long_t           rx_dropped; /* dropped packets by core network
1068                                              * Do not use this in drivers.
1069                                              */
1070 
1071 #ifdef CONFIG_WIRELESS_EXT
1072         /* List of functions to handle Wireless Extensions (instead of ioctl).
1073          * See <net/iw_handler.h> for details. Jean II */
1074         const struct iw_handler_def *   wireless_handlers;
1075         /* Instance data managed by the core of Wireless Extensions. */
1076         struct iw_public_data * wireless_data;
1077 #endif
1078         /* Management operations */
1079         const struct net_device_ops *netdev_ops;
1080         const struct ethtool_ops *ethtool_ops;
1081 
1082         /* Hardware header description */
1083         const struct header_ops *header_ops;
1084 
1085         unsigned int            flags;  /* interface flags (a la BSD)   */
1086         unsigned int            priv_flags; /* Like 'flags' but invisible to userspace.
1087                                              * See if.h for definitions. */
1088         unsigned short          gflags;
1089         unsigned short          padded; /* How much padding added by alloc_netdev() */
1090 
1091         unsigned char           operstate; /* RFC2863 operstate */
1092         unsigned char           link_mode; /* mapping policy to operstate */
1093 
1094         unsigned char           if_port;        /* Selectable AUI, TP,..*/
1095         unsigned char           dma;            /* DMA channel          */
1096 
1097         unsigned int            mtu;    /* interface MTU value          */
1098         unsigned short          type;   /* interface hardware type      */
1099         unsigned short          hard_header_len;        /* hardware hdr length  */
1100 
1101         /* extra head- and tailroom the hardware may need, but not in all cases
1102          * can this be guaranteed, especially tailroom. Some cases also use
1103          * LL_MAX_HEADER instead to allocate the skb.
1104          */
1105         unsigned short          needed_headroom;
1106         unsigned short          needed_tailroom;
1107 
1108         /* Interface address info. */
1109         unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
1110         unsigned char           addr_assign_type; /* hw address assignment type */
1111         unsigned char           addr_len;       /* hardware address length      */
1112         unsigned char           neigh_priv_len;
1113         unsigned short          dev_id;         /* for shared network cards */
1114 
1115         spinlock_t              addr_list_lock;
1116         struct netdev_hw_addr_list      uc;     /* Unicast mac addresses */
1117         struct netdev_hw_addr_list      mc;     /* Multicast mac addresses */
1118         bool                    uc_promisc;
1119         unsigned int            promiscuity;
1120         unsigned int            allmulti;
1121 
1122 
1123         /* Protocol specific pointers */
1124 
1125 #if IS_ENABLED(CONFIG_VLAN_8021Q)
1126         struct vlan_info __rcu  *vlan_info;     /* VLAN info */
1127 #endif
1128 #if IS_ENABLED(CONFIG_NET_DSA)
1129         struct dsa_switch_tree  *dsa_ptr;       /* dsa specific data */
1130 #endif
1131         void                    *atalk_ptr;     /* AppleTalk link       */
1132         struct in_device __rcu  *ip_ptr;        /* IPv4 specific data   */
1133         struct dn_dev __rcu     *dn_ptr;        /* DECnet specific data */
1134         struct inet6_dev __rcu  *ip6_ptr;       /* IPv6 specific data */
1135         void                    *ec_ptr;        /* Econet specific data */
1136         void                    *ax25_ptr;      /* AX.25 specific data */
1137         struct wireless_dev     *ieee80211_ptr; /* IEEE 802.11 specific data,
1138                                                    assign before registering */
1139 
1140 /*
1141  * Cache lines mostly used on receive path (including eth_type_trans())
1142  */
1143         unsigned long           last_rx;        /* Time of last Rx
1144                                                  * This should not be set in
1145                                                  * drivers, unless really needed,
1146                                                  * because network stack (bonding)
1147                                                  * use it if/when necessary, to
1148                                                  * avoid dirtying this cache line.
1149                                                  */
1150 
1151         struct net_device       *master; /* Pointer to master device of a group,
1152                                           * which this device is member of.
1153                                           */
1154 
1155         /* Interface address info used in eth_type_trans() */
1156         unsigned char           *dev_addr;      /* hw address, (before bcast
1157                                                    because most packets are
1158                                                    unicast) */
1159 
1160         struct netdev_hw_addr_list      dev_addrs; /* list of device
1161                                                       hw addresses */
1162 
1163         unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
1164 
1165 #ifdef CONFIG_SYSFS
1166         struct kset             *queues_kset;
1167 #endif
1168 
1169 #ifdef CONFIG_RPS
1170         struct netdev_rx_queue  *_rx;
1171 
1172         /* Number of RX queues allocated at register_netdev() time */
1173         unsigned int            num_rx_queues;
1174 
1175         /* Number of RX queues currently active in device */
1176         unsigned int            real_num_rx_queues;
1177 
1178 #ifdef CONFIG_RFS_ACCEL
1179         /* CPU reverse-mapping for RX completion interrupts, indexed
1180          * by RX queue number.  Assigned by driver.  This must only be
1181          * set if the ndo_rx_flow_steer operation is defined. */
1182         struct cpu_rmap         *rx_cpu_rmap;
1183 #endif
1184 #endif
1185 
1186         rx_handler_func_t __rcu *rx_handler;
1187         void __rcu              *rx_handler_data;
1188 
1189         struct netdev_queue __rcu *ingress_queue;
1190 
1191 /*
1192  * Cache lines mostly used on transmit path
1193  */
1194         struct netdev_queue     *_tx ____cacheline_aligned_in_smp;
1195 
1196         /* Number of TX queues allocated at alloc_netdev_mq() time  */
1197         unsigned int            num_tx_queues;
1198 
1199         /* Number of TX queues currently active in device  */
1200         unsigned int            real_num_tx_queues;
1201 
1202         /* root qdisc from userspace point of view */
1203         struct Qdisc            *qdisc;
1204 
1205         unsigned long           tx_queue_len;   /* Max frames per queue allowed */
1206         spinlock_t              tx_global_lock;
1207 
1208 #ifdef CONFIG_XPS
1209         struct xps_dev_maps __rcu *xps_maps;
1210 #endif
1211 
1212         /* These may be needed for future network-power-down code. */
1213 
1214         /*
1215          * trans_start here is expensive for high speed devices on SMP,
1216          * please use netdev_queue->trans_start instead.
1217          */
1218         unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
1219 
1220         int                     watchdog_timeo; /* used by dev_watchdog() */
1221         struct timer_list       watchdog_timer;
1222 
1223         /* Number of references to this device */
1224         int __percpu            *pcpu_refcnt;
1225 
1226         /* delayed register/unregister */
1227         struct list_head        todo_list;
1228         /* device index hash chain */
1229         struct hlist_node       index_hlist;
1230 
1231         struct list_head        link_watch_list;
1232 
1233         /* register/unregister state machine */
1234         enum { NETREG_UNINITIALIZED=0,
1235                NETREG_REGISTERED,       /* completed register_netdevice */
1236                NETREG_UNREGISTERING,    /* called unregister_netdevice */
1237                NETREG_UNREGISTERED,     /* completed unregister todo */
1238                NETREG_RELEASED,         /* called free_netdev */
1239                NETREG_DUMMY,            /* dummy device for NAPI poll */
1240         } reg_state:8;
1241 
1242         bool dismantle; /* device is going do be freed */
1243 
1244         enum {
1245                 RTNL_LINK_INITIALIZED,
1246                 RTNL_LINK_INITIALIZING,
1247         } rtnl_link_state:16;
1248 
1249         /* Called from unregister, can be used to call free_netdev */
1250         void (*destructor)(struct net_device *dev);
1251 
1252 #ifdef CONFIG_NETPOLL
1253         struct netpoll_info     *npinfo;
1254 #endif
1255 
1256 #ifdef CONFIG_NET_NS
1257         /* Network namespace this network device is inside */
1258         struct net              *nd_net;
1259 #endif
1260 
1261         /* mid-layer private */
1262         union {
1263                 void                            *ml_priv;
1264                 struct pcpu_lstats __percpu     *lstats; /* loopback stats */
1265                 struct pcpu_tstats __percpu     *tstats; /* tunnel stats */
1266                 struct pcpu_dstats __percpu     *dstats; /* dummy stats */
1267         };
1268         /* GARP */
1269         struct garp_port __rcu  *garp_port;
1270 
1271         /* class/net/name entry */
1272         struct device           dev;
1273         /* space for optional device, statistics, and wireless sysfs groups */
1274         const struct attribute_group *sysfs_groups[4];
1275 
1276         /* rtnetlink link ops */
1277         const struct rtnl_link_ops *rtnl_link_ops;
1278 
1279         /* for setting kernel sock attribute on TCP connection setup */
1280 #define GSO_MAX_SIZE            65536
1281         unsigned int            gso_max_size;
1282 #define GSO_MAX_SEGS            65535
1283         u16                     gso_max_segs;
1284 
1285 #ifdef CONFIG_DCB
1286         /* Data Center Bridging netlink ops */
1287         const struct dcbnl_rtnl_ops *dcbnl_ops;
1288 #endif
1289         u8 num_tc;
1290         struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
1291         u8 prio_tc_map[TC_BITMASK + 1];
1292 
1293 #if IS_ENABLED(CONFIG_FCOE)
1294         /* max exchange id for FCoE LRO by ddp */
1295         unsigned int            fcoe_ddp_xid;
1296 #endif
1297 #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
1298         struct netprio_map __rcu *priomap;
1299 #endif
1300         /* phy device may attach itself for hardware timestamping */
1301         struct phy_device *phydev;
1302 
1303         /* group the device belongs to */
1304         int group;
1305 };
1306 #define to_net_dev(d) container_of(d, struct net_device, dev)
1307 
1308 #define NETDEV_ALIGN            32
1309 
1310 static inline
1311 int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
1312 {
1313         return dev->prio_tc_map[prio & TC_BITMASK];
1314 }
1315 
1316 static inline
1317 int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc)
1318 {
1319         if (tc >= dev->num_tc)
1320                 return -EINVAL;
1321 
1322         dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK;
1323         return 0;
1324 }
1325 
1326 static inline
1327 void netdev_reset_tc(struct net_device *dev)
1328 {
1329         dev->num_tc = 0;
1330         memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
1331         memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
1332 }
1333 
1334 static inline
1335 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
1336 {
1337         if (tc >= dev->num_tc)
1338                 return -EINVAL;
1339 
1340         dev->tc_to_txq[tc].count = count;
1341         dev->tc_to_txq[tc].offset = offset;
1342         return 0;
1343 }
1344 
1345 static inline
1346 int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
1347 {
1348         if (num_tc > TC_MAX_QUEUE)
1349                 return -EINVAL;
1350 
1351         dev->num_tc = num_tc;
1352         return 0;
1353 }
1354 
1355 static inline
1356 int netdev_get_num_tc(struct net_device *dev)
1357 {
1358         return dev->num_tc;
1359 }
1360 
1361 static inline
1362 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
1363                                          unsigned int index)
1364 {
1365         return &dev->_tx[index];
1366 }
1367 
1368 static inline void netdev_for_each_tx_queue(struct net_device *dev,
1369                                             void (*f)(struct net_device *,
1370                                                       struct netdev_queue *,
1371                                                       void *),
1372                                             void *arg)
1373 {
1374         unsigned int i;
1375 
1376         for (i = 0; i < dev->num_tx_queues; i++)
1377                 f(dev, &dev->_tx[i], arg);
1378 }
1379 
1380 /*
1381  * Net namespace inlines
1382  */
1383 static inline
1384 struct net *dev_net(const struct net_device *dev)
1385 {
1386         return read_pnet(&dev->nd_net);
1387 }
1388 
1389 static inline
1390 void dev_net_set(struct net_device *dev, struct net *net)
1391 {
1392 #ifdef CONFIG_NET_NS
1393         release_net(dev->nd_net);
1394         dev->nd_net = hold_net(net);
1395 #endif
1396 }
1397 
1398 static inline bool netdev_uses_dsa_tags(struct net_device *dev)
1399 {
1400 #ifdef CONFIG_NET_DSA_TAG_DSA
1401         if (dev->dsa_ptr != NULL)
1402                 return dsa_uses_dsa_tags(dev->dsa_ptr);
1403 #endif
1404 
1405         return 0;
1406 }
1407 
1408 static inline bool netdev_uses_trailer_tags(struct net_device *dev)
1409 {
1410 #ifdef CONFIG_NET_DSA_TAG_TRAILER
1411         if (dev->dsa_ptr != NULL)
1412                 return dsa_uses_trailer_tags(dev->dsa_ptr);
1413 #endif
1414 
1415         return 0;
1416 }
1417 
1418 /**
1419  *      netdev_priv - access network device private data
1420  *      @dev: network device
1421  *
1422  * Get network device private data
1423  */
1424 static inline void *netdev_priv(const struct net_device *dev)
1425 {
1426         return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
1427 }
1428 
1429 /* Set the sysfs physical device reference for the network logical device
1430  * if set prior to registration will cause a symlink during initialization.
1431  */
1432 #define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))
1433 
1434 /* Set the sysfs device type for the network logical device to allow
1435  * fin grained indentification of different network device types. For
1436  * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
1437  */
1438 #define SET_NETDEV_DEVTYPE(net, devtype)        ((net)->dev.type = (devtype))
1439 
1440 /**
1441  *      netif_napi_add - initialize a napi context
1442  *      @dev:  network device
1443  *      @napi: napi context
1444  *      @poll: polling function
1445  *      @weight: default weight
1446  *
1447  * netif_napi_add() must be used to initialize a napi context prior to calling
1448  * *any* of the other napi related functions.
1449  */
1450 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
1451                     int (*poll)(struct napi_struct *, int), int weight);
1452 
1453 /**
1454  *  netif_napi_del - remove a napi context
1455  *  @napi: napi context
1456  *
1457  *  netif_napi_del() removes a napi context from the network device napi list
1458  */
1459 void netif_napi_del(struct napi_struct *napi);
1460 
1461 struct napi_gro_cb {
1462         /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
1463         void *frag0;
1464 
1465         /* Length of frag0. */
1466         unsigned int frag0_len;
1467 
1468         /* This indicates where we are processing relative to skb->data. */
1469         int data_offset;
1470 
1471         /* This is non-zero if the packet may be of the same flow. */
1472         int same_flow;
1473 
1474         /* This is non-zero if the packet cannot be merged with the new skb. */
1475         int flush;
1476 
1477         /* Number of segments aggregated. */
1478         int count;
1479 
1480         /* Free the skb? */
1481         int free;
1482 };
1483 
1484 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1485 
1486 struct packet_type {
1487         __be16                  type;   /* This is really htons(ether_type). */
1488         struct net_device       *dev;   /* NULL is wildcarded here           */
1489         int                     (*func) (struct sk_buff *,
1490                                          struct net_device *,
1491                                          struct packet_type *,
1492                                          struct net_device *);
1493         struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
1494                                                 netdev_features_t features);
1495         int                     (*gso_send_check)(struct sk_buff *skb);
1496         struct sk_buff          **(*gro_receive)(struct sk_buff **head,
1497                                                struct sk_buff *skb);
1498         int                     (*gro_complete)(struct sk_buff *skb);
1499         bool                    (*id_match)(struct packet_type *ptype,
1500                                             struct sock *sk);
1501         void                    *af_packet_priv;
1502         struct list_head        list;
1503 };
1504 
1505 #include <linux/notifier.h>
1506 
1507 /* netdevice notifier chain. Please remember to update the rtnetlink
1508  * notification exclusion list in rtnetlink_event() when adding new
1509  * types.
1510  */
1511 #define NETDEV_UP       0x0001  /* For now you can't veto a device up/down */
1512 #define NETDEV_DOWN     0x0002
1513 #define NETDEV_REBOOT   0x0003  /* Tell a protocol stack a network interface
1514                                    detected a hardware crash and restarted
1515                                    - we can use this eg to kick tcp sessions
1516                                    once done */
1517 #define NETDEV_CHANGE   0x0004  /* Notify device state change */
1518 #define NETDEV_REGISTER 0x0005
1519 #define NETDEV_UNREGISTER       0x0006
1520 #define NETDEV_CHANGEMTU        0x0007
1521 #define NETDEV_CHANGEADDR       0x0008
1522 #define NETDEV_GOING_DOWN       0x0009
1523 #define NETDEV_CHANGENAME       0x000A
1524 #define NETDEV_FEAT_CHANGE      0x000B
1525 #define NETDEV_BONDING_FAILOVER 0x000C
1526 #define NETDEV_PRE_UP           0x000D
1527 #define NETDEV_PRE_TYPE_CHANGE  0x000E
1528 #define NETDEV_POST_TYPE_CHANGE 0x000F
1529 #define NETDEV_POST_INIT        0x0010
1530 #define NETDEV_UNREGISTER_BATCH 0x0011
1531 #define NETDEV_RELEASE          0x0012
1532 #define NETDEV_NOTIFY_PEERS     0x0013
1533 #define NETDEV_JOIN             0x0014
1534 
1535 extern int register_netdevice_notifier(struct notifier_block *nb);
1536 extern int unregister_netdevice_notifier(struct notifier_block *nb);
1537 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1538 
1539 
1540 extern rwlock_t                         dev_base_lock;          /* Device list lock */
1541 
1542 
1543 #define for_each_netdev(net, d)         \
1544                 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1545 #define for_each_netdev_reverse(net, d) \
1546                 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1547 #define for_each_netdev_rcu(net, d)             \
1548                 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1549 #define for_each_netdev_safe(net, d, n) \
1550                 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
1551 #define for_each_netdev_continue(net, d)                \
1552                 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
1553 #define for_each_netdev_continue_rcu(net, d)            \
1554         list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1555 #define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)
1556 
1557 static inline struct net_device *next_net_device(struct net_device *dev)
1558 {
1559         struct list_head *lh;
1560         struct net *net;
1561 
1562         net = dev_net(dev);
1563         lh = dev->dev_list.next;
1564         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1565 }
1566 
1567 static inline struct net_device *next_net_device_rcu(struct net_device *dev)
1568 {
1569         struct list_head *lh;
1570         struct net *net;
1571 
1572         net = dev_net(dev);
1573         lh = rcu_dereference(list_next_rcu(&dev->dev_list));
1574         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1575 }
1576 
1577 static inline struct net_device *first_net_device(struct net *net)
1578 {
1579         return list_empty(&net->dev_base_head) ? NULL :
1580                 net_device_entry(net->dev_base_head.next);
1581 }
1582 
1583 static inline struct net_device *first_net_device_rcu(struct net *net)
1584 {
1585         struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head));
1586 
1587         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1588 }
1589 
1590 extern int                      netdev_boot_setup_check(struct net_device *dev);
1591 extern unsigned long            netdev_boot_base(const char *prefix, int unit);
1592 extern struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
1593                                               const char *hwaddr);
1594 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
1595 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
1596 extern void             dev_add_pack(struct packet_type *pt);
1597 extern void             dev_remove_pack(struct packet_type *pt);
1598 extern void             __dev_remove_pack(struct packet_type *pt);
1599 
1600 extern struct net_device        *dev_get_by_flags_rcu(struct net *net, unsigned short flags,
1601                                                       unsigned short mask);
1602 extern struct net_device        *dev_get_by_name(struct net *net, const char *name);
1603 extern struct net_device        *dev_get_by_name_rcu(struct net *net, const char *name);
1604 extern struct net_device        *__dev_get_by_name(struct net *net, const char *name);
1605 extern int              dev_alloc_name(struct net_device *dev, const char *name);
1606 extern int              dev_open(struct net_device *dev);
1607 extern int              dev_close(struct net_device *dev);
1608 extern void             dev_disable_lro(struct net_device *dev);
1609 extern int              dev_queue_xmit(struct sk_buff *skb);
1610 extern int              register_netdevice(struct net_device *dev);
1611 extern void             unregister_netdevice_queue(struct net_device *dev,
1612                                                    struct list_head *head);
1613 extern void             unregister_netdevice_many(struct list_head *head);
1614 static inline void unregister_netdevice(struct net_device *dev)
1615 {
1616         unregister_netdevice_queue(dev, NULL);
1617 }
1618 
1619 extern int              netdev_refcnt_read(const struct net_device *dev);
1620 extern void             free_netdev(struct net_device *dev);
1621 extern void             synchronize_net(void);
1622 extern int              init_dummy_netdev(struct net_device *dev);
1623 extern void             netdev_resync_ops(struct net_device *dev);
1624 
1625 extern struct net_device        *dev_get_by_index(struct net *net, int ifindex);
1626 extern struct net_device        *__dev_get_by_index(struct net *net, int ifindex);
1627 extern struct net_device        *dev_get_by_index_rcu(struct net *net, int ifindex);
1628 extern int              dev_restart(struct net_device *dev);
1629 #ifdef CONFIG_NETPOLL_TRAP
1630 extern int              netpoll_trap(void);
1631 #endif
1632 extern int             skb_gro_receive(struct sk_buff **head,
1633                                        struct sk_buff *skb);
1634 extern void            skb_gro_reset_offset(struct sk_buff *skb);
1635 
1636 static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
1637 {
1638         return NAPI_GRO_CB(skb)->data_offset;
1639 }
1640 
1641 static inline unsigned int skb_gro_len(const struct sk_buff *skb)
1642 {
1643         return skb->len - NAPI_GRO_CB(skb)->data_offset;
1644 }
1645 
1646 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
1647 {
1648         NAPI_GRO_CB(skb)->data_offset += len;
1649 }
1650 
1651 static inline void *skb_gro_header_fast(struct sk_buff *skb,
1652                                         unsigned int offset)
1653 {
1654         return NAPI_GRO_CB(skb)->frag0 + offset;
1655 }
1656 
1657 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
1658 {
1659         return NAPI_GRO_CB(skb)->frag0_len < hlen;
1660 }
1661 
1662 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
1663                                         unsigned int offset)
1664 {
1665         if (!pskb_may_pull(skb, hlen))
1666                 return NULL;
1667 
1668         NAPI_GRO_CB(skb)->frag0 = NULL;
1669         NAPI_GRO_CB(skb)->frag0_len = 0;
1670         return skb->data + offset;
1671 }
1672 
1673 static inline void *skb_gro_mac_header(struct sk_buff *skb)
1674 {
1675         return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1676 }
1677 
1678 static inline void *skb_gro_network_header(struct sk_buff *skb)
1679 {
1680         return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
1681                skb_network_offset(skb);
1682 }
1683 
1684 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
1685                                   unsigned short type,
1686                                   const void *daddr, const void *saddr,
1687                                   unsigned len)
1688 {
1689         if (!dev->header_ops || !dev->header_ops->create)
1690                 return 0;
1691 
1692         return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1693 }
1694 
1695 static inline int dev_parse_header(const struct sk_buff *skb,
1696                                    unsigned char *haddr)
1697 {
1698         const struct net_device *dev = skb->dev;
1699 
1700         if (!dev->header_ops || !dev->header_ops->parse)
1701                 return 0;
1702         return dev->header_ops->parse(skb, haddr);
1703 }
1704 
1705 static inline int dev_rebuild_header(struct sk_buff *skb)
1706 {
1707         const struct net_device *dev = skb->dev;
1708 
1709         if (!dev->header_ops || !dev->header_ops->rebuild)
1710                 return 0;
1711         return dev->header_ops->rebuild(skb);
1712 }
1713 
1714 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1715 extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
1716 static inline int unregister_gifconf(unsigned int family)
1717 {
1718         return register_gifconf(family, NULL);
1719 }
1720 
1721 /*
1722  * Incoming packets are placed on per-cpu queues
1723  */
1724 struct softnet_data {
1725         struct Qdisc            *output_queue;
1726         struct Qdisc            **output_queue_tailp;
1727         struct list_head        poll_list;
1728         struct sk_buff          *completion_queue;
1729         struct sk_buff_head     process_queue;
1730 
1731         /* stats */
1732         unsigned int            processed;
1733         unsigned int            time_squeeze;
1734         unsigned int            cpu_collision;
1735         unsigned int            received_rps;
1736 
1737 #ifdef CONFIG_RPS
1738         struct softnet_data     *rps_ipi_list;
1739 
1740         /* Elements below can be accessed between CPUs for RPS */
1741         struct call_single_data csd ____cacheline_aligned_in_smp;
1742         struct softnet_data     *rps_ipi_next;
1743         unsigned int            cpu;
1744         unsigned int            input_queue_head;
1745         unsigned int            input_queue_tail;
1746 #endif
1747         unsigned                dropped;
1748         struct sk_buff_head     input_pkt_queue;
1749         struct napi_struct      backlog;
1750 };
1751 
1752 static inline void input_queue_head_incr(struct softnet_data *sd)
1753 {
1754 #ifdef CONFIG_RPS
1755         sd->input_queue_head++;
1756 #endif
1757 }
1758 
1759 static inline void input_queue_tail_incr_save(struct softnet_data *sd,
1760                                               unsigned int *qtail)
1761 {
1762 #ifdef CONFIG_RPS
1763         *qtail = ++sd->input_queue_tail;
1764 #endif
1765 }
1766 
1767 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
1768 
1769 extern void __netif_schedule(struct Qdisc *q);
1770 
1771 static inline void netif_schedule_queue(struct netdev_queue *txq)
1772 {
1773         if (!(txq->state & QUEUE_STATE_ANY_XOFF))
1774                 __netif_schedule(txq->qdisc);
1775 }
1776 
1777 static inline void netif_tx_schedule_all(struct net_device *dev)
1778 {
1779         unsigned int i;
1780 
1781         for (i = 0; i < dev->num_tx_queues; i++)
1782                 netif_schedule_queue(netdev_get_tx_queue(dev, i));
1783 }
1784 
1785 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
1786 {
1787         clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1788 }
1789 
1790 /**
1791  *      netif_start_queue - allow transmit
1792  *      @dev: network device
1793  *
1794  *      Allow upper layers to call the device hard_start_xmit routine.
1795  */
1796 static inline void netif_start_queue(struct net_device *dev)
1797 {
1798         netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
1799 }
1800 
1801 static inline void netif_tx_start_all_queues(struct net_device *dev)
1802 {
1803         unsigned int i;
1804 
1805         for (i = 0; i < dev->num_tx_queues; i++) {
1806                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1807                 netif_tx_start_queue(txq);
1808         }
1809 }
1810 
1811 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
1812 {
1813 #ifdef CONFIG_NETPOLL_TRAP
1814         if (netpoll_trap()) {
1815                 netif_tx_start_queue(dev_queue);
1816                 return;
1817         }
1818 #endif
1819         if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state))
1820                 __netif_schedule(dev_queue->qdisc);
1821 }
1822 
1823 /**
1824  *      netif_wake_queue - restart transmit
1825  *      @dev: network device
1826  *
1827  *      Allow upper layers to call the device hard_start_xmit routine.
1828  *      Used for flow control when transmit resources are available.
1829  */
1830 static inline void netif_wake_queue(struct net_device *dev)
1831 {
1832         netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
1833 }
1834 
1835 static inline void netif_tx_wake_all_queues(struct net_device *dev)
1836 {
1837         unsigned int i;
1838 
1839         for (i = 0; i < dev->num_tx_queues; i++) {
1840                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1841                 netif_tx_wake_queue(txq);
1842         }
1843 }
1844 
1845 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
1846 {
1847         if (WARN_ON(!dev_queue)) {
1848                 pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
1849                 return;
1850         }
1851         set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1852 }
1853 
1854 /**
1855  *      netif_stop_queue - stop transmitted packets
1856  *      @dev: network device
1857  *
1858  *      Stop upper layers calling the device hard_start_xmit routine.
1859  *      Used for flow control when transmit resources are unavailable.
1860  */
1861 static inline void netif_stop_queue(struct net_device *dev)
1862 {
1863         netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
1864 }
1865 
1866 static inline void netif_tx_stop_all_queues(struct net_device *dev)
1867 {
1868         unsigned int i;
1869 
1870         for (i = 0; i < dev->num_tx_queues; i++) {
1871                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1872                 netif_tx_stop_queue(txq);
1873         }
1874 }
1875 
1876 static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1877 {
1878         return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1879 }
1880 
1881 /**
1882  *      netif_queue_stopped - test if transmit queue is flowblocked
1883  *      @dev: network device
1884  *
1885  *      Test if transmit queue on device is currently unable to send.
1886  */
1887 static inline bool netif_queue_stopped(const struct net_device *dev)
1888 {
1889         return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
1890 }
1891 
1892 static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
1893 {
1894         return dev_queue->state & QUEUE_STATE_ANY_XOFF;
1895 }
1896 
1897 static inline bool netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
1898 {
1899         return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
1900 }
1901 
1902 static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
1903                                         unsigned int bytes)
1904 {
1905 #ifdef CONFIG_BQL
1906         dql_queued(&dev_queue->dql, bytes);
1907 
1908         if (likely(dql_avail(&dev_queue->dql) >= 0))
1909                 return;
1910 
1911         set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
1912 
1913         /*
1914          * The XOFF flag must be set before checking the dql_avail below,
1915          * because in netdev_tx_completed_queue we update the dql_completed
1916          * before checking the XOFF flag.
1917          */
1918         smp_mb();
1919 
1920         /* check again in case another CPU has just made room avail */
1921         if (unlikely(dql_avail(&dev_queue->dql) >= 0))
1922                 clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
1923 #endif
1924 }
1925 
1926 static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes)
1927 {
1928         netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes);
1929 }
1930 
1931 static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue,
1932                                              unsigned pkts, unsigned bytes)
1933 {
1934 #ifdef CONFIG_BQL
1935         if (unlikely(!bytes))
1936                 return;
1937 
1938         dql_completed(&dev_queue->dql, bytes);
1939 
1940         /*
1941          * Without the memory barrier there is a small possiblity that
1942          * netdev_tx_sent_queue will miss the update and cause the queue to
1943          * be stopped forever
1944          */
1945         smp_mb();
1946 
1947         if (dql_avail(&dev_queue->dql) < 0)
1948                 return;
1949 
1950         if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state))
1951                 netif_schedule_queue(dev_queue);
1952 #endif
1953 }
1954 
1955 static inline void netdev_completed_queue(struct net_device *dev,
1956                                           unsigned pkts, unsigned bytes)
1957 {
1958         netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes);
1959 }
1960 
1961 static inline void netdev_tx_reset_queue(struct netdev_queue *q)
1962 {
1963 #ifdef CONFIG_BQL
1964         clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
1965         dql_reset(&q->dql);
1966 #endif
1967 }
1968 
1969 static inline void netdev_reset_queue(struct net_device *dev_queue)
1970 {
1971         netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
1972 }
1973 
1974 /**
1975  *      netif_running - test if up
1976  *      @dev: network device
1977  *
1978  *      Test if the device has been brought up.
1979  */
1980 static inline bool netif_running(const struct net_device *dev)
1981 {
1982         return test_bit(__LINK_STATE_START, &dev->state);
1983 }
1984 
1985 /*
1986  * Routines to manage the subqueues on a device.  We only need start
1987  * stop, and a check if it's stopped.  All other device management is
1988  * done at the overall netdevice level.
1989  * Also test the device if we're multiqueue.
1990  */
1991 
1992 /**
1993  *      netif_start_subqueue - allow sending packets on subqueue
1994  *      @dev: network device
1995  *      @queue_index: sub queue index
1996  *
1997  * Start individual transmit queue of a device with multiple transmit queues.
1998  */
1999 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
2000 {
2001         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2002 
2003         netif_tx_start_queue(txq);
2004 }
2005 
2006 /**
2007  *      netif_stop_subqueue - stop sending packets on subqueue
2008  *      @dev: network device
2009  *      @queue_index: sub queue index
2010  *
2011  * Stop individual transmit queue of a device with multiple transmit queues.
2012  */
2013 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
2014 {
2015         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2016 #ifdef CONFIG_NETPOLL_TRAP
2017         if (netpoll_trap())
2018                 return;
2019 #endif
2020         netif_tx_stop_queue(txq);
2021 }
2022 
2023 /**
2024  *      netif_subqueue_stopped - test status of subqueue
2025  *      @dev: network device
2026  *      @queue_index: sub queue index
2027  *
2028  * Check individual transmit queue of a device with multiple transmit queues.
2029  */
2030 static inline bool __netif_subqueue_stopped(const struct net_device *dev,
2031                                             u16 queue_index)
2032 {
2033         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2034 
2035         return netif_tx_queue_stopped(txq);
2036 }
2037 
2038 static inline bool netif_subqueue_stopped(const struct net_device *dev,
2039                                           struct sk_buff *skb)
2040 {
2041         return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
2042 }
2043 
2044 /**
2045  *      netif_wake_subqueue - allow sending packets on subqueue
2046  *      @dev: network device
2047  *      @queue_index: sub queue index
2048  *
2049  * Resume individual transmit queue of a device with multiple transmit queues.
2050  */
2051 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
2052 {
2053         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2054 #ifdef CONFIG_NETPOLL_TRAP
2055         if (netpoll_trap())
2056                 return;
2057 #endif
2058         if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state))
2059                 __netif_schedule(txq->qdisc);
2060 }
2061 
2062 /*
2063  * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
2064  * as a distribution range limit for the returned value.
2065  */
2066 static inline u16 skb_tx_hash(const struct net_device *dev,
2067                               const struct sk_buff *skb)
2068 {
2069         return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
2070 }
2071 
2072 /**
2073  *      netif_is_multiqueue - test if device has multiple transmit queues
2074  *      @dev: network device
2075  *
2076  * Check if device has multiple transmit queues
2077  */
2078 static inline bool netif_is_multiqueue(const struct net_device *dev)
2079 {
2080         return dev->num_tx_queues > 1;
2081 }
2082 
2083 extern int netif_set_real_num_tx_queues(struct net_device *dev,
2084                                         unsigned int txq);
2085 
2086 #ifdef CONFIG_RPS
2087 extern int netif_set_real_num_rx_queues(struct net_device *dev,
2088                                         unsigned int rxq);
2089 #else
2090 static inline int netif_set_real_num_rx_queues(struct net_device *dev,
2091                                                 unsigned int rxq)
2092 {
2093         return 0;
2094 }
2095 #endif
2096 
2097 static inline int netif_copy_real_num_queues(struct net_device *to_dev,
2098                                              const struct net_device *from_dev)
2099 {
2100         netif_set_real_num_tx_queues(to_dev, from_dev->real_num_tx_queues);
2101 #ifdef CONFIG_RPS
2102         return netif_set_real_num_rx_queues(to_dev,
2103                                             from_dev->real_num_rx_queues);
2104 #else
2105         return 0;
2106 #endif
2107 }
2108 
2109 /* Use this variant when it is known for sure that it
2110  * is executing from hardware interrupt context or with hardware interrupts
2111  * disabled.
2112  */
2113 extern void dev_kfree_skb_irq(struct sk_buff *skb);
2114 
2115 /* Use this variant in places where it could be invoked
2116  * from either hardware interrupt or other context, with hardware interrupts
2117  * either disabled or enabled.
2118  */
2119 extern void dev_kfree_skb_any(struct sk_buff *skb);
2120 
2121 extern int              netif_rx(struct sk_buff *skb);
2122 extern int              netif_rx_ni(struct sk_buff *skb);
2123 extern int              netif_receive_skb(struct sk_buff *skb);
2124 extern gro_result_t     dev_gro_receive(struct napi_struct *napi,
2125                                         struct sk_buff *skb);
2126 extern gro_result_t     napi_skb_finish(gro_result_t ret, struct sk_buff *skb);
2127 extern gro_result_t     napi_gro_receive(struct napi_struct *napi,
2128                                          struct sk_buff *skb);
2129 extern void             napi_gro_flush(struct napi_struct *napi);
2130 extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
2131 extern gro_result_t     napi_frags_finish(struct napi_struct *napi,
2132                                           struct sk_buff *skb,
2133                                           gro_result_t ret);
2134 extern struct sk_buff * napi_frags_skb(struct napi_struct *napi);
2135 extern gro_result_t     napi_gro_frags(struct napi_struct *napi);
2136 
2137 static inline void napi_free_frags(struct napi_struct *napi)
2138 {
2139         kfree_skb(napi->skb);
2140         napi->skb = NULL;
2141 }
2142 
2143 extern int netdev_rx_handler_register(struct net_device *dev,
2144                                       rx_handler_func_t *rx_handler,
2145                                       void *rx_handler_data);
2146 extern void netdev_rx_handler_unregister(struct net_device *dev);
2147 
2148 extern bool             dev_valid_name(const char *name);
2149 extern int              dev_ioctl(struct net *net, unsigned int cmd, void __user *);
2150 extern int              dev_ethtool(struct net *net, struct ifreq *);
2151 extern unsigned         dev_get_flags(const struct net_device *);
2152 extern int              __dev_change_flags(struct net_device *, unsigned int flags);
2153 extern int              dev_change_flags(struct net_device *, unsigned);
2154 extern void             __dev_notify_flags(struct net_device *, unsigned int old_flags);
2155 extern int              dev_change_name(struct net_device *, const char *);
2156 extern int              dev_set_alias(struct net_device *, const char *, size_t);
2157 extern int              dev_change_net_namespace(struct net_device *,
2158                                                  struct net *, const char *);
2159 extern int              dev_set_mtu(struct net_device *, int);
2160 extern void             dev_set_group(struct net_device *, int);
2161 extern int              dev_set_mac_address(struct net_device *,
2162                                             struct sockaddr *);
2163 extern int              dev_hard_start_xmit(struct sk_buff *skb,
2164                                             struct net_device *dev,
2165                                             struct netdev_queue *txq);
2166 extern int              dev_forward_skb(struct net_device *dev,
2167                                         struct sk_buff *skb);
2168 
2169 extern int              netdev_budget;
2170 
2171 /* Called by rtnetlink.c:rtnl_unlock() */
2172 extern void netdev_run_todo(void);
2173 
2174 /**
2175  *      dev_put - release reference to device
2176  *      @dev: network device
2177  *
2178  * Release reference to device to allow it to be freed.
2179  */
2180 static inline void dev_put(struct net_device *dev)
2181 {
2182         this_cpu_dec(*dev->pcpu_refcnt);
2183 }
2184 
2185 /**
2186  *      dev_hold - get reference to device
2187  *      @dev: network device
2188  *
2189  * Hold reference to device to keep it from being freed.
2190  */
2191 static inline void dev_hold(struct net_device *dev)
2192 {
2193         this_cpu_inc(*dev->pcpu_refcnt);
2194 }
2195 
2196 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
2197  * and _off may be called from IRQ context, but it is caller
2198  * who is responsible for serialization of these calls.
2199  *
2200  * The name carrier is inappropriate, these functions should really be
2201  * called netif_lowerlayer_*() because they represent the state of any
2202  * kind of lower layer not just hardware media.
2203  */
2204 
2205 extern void linkwatch_fire_event(struct net_device *dev);
2206 extern void linkwatch_forget_dev(struct net_device *dev);
2207 
2208 /**
2209  *      netif_carrier_ok - test if carrier present
2210  *      @dev: network device
2211  *
2212  * Check if carrier is present on device
2213  */
2214 static inline bool netif_carrier_ok(const struct net_device *dev)
2215 {
2216         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
2217 }
2218 
2219 extern unsigned long dev_trans_start(struct net_device *dev);
2220 
2221 extern void __netdev_watchdog_up(struct net_device *dev);
2222 
2223 extern void netif_carrier_on(struct net_device *dev);
2224 
2225 extern void netif_carrier_off(struct net_device *dev);
2226 
2227 extern void netif_notify_peers(struct net_device *dev);
2228 
2229 /**
2230  *      netif_dormant_on - mark device as dormant.
2231  *      @dev: network device
2232  *
2233  * Mark device as dormant (as per RFC2863).
2234  *
2235  * The dormant state indicates that the relevant interface is not
2236  * actually in a condition to pass packets (i.e., it is not 'up') but is
2237  * in a "pending" state, waiting for some external event.  For "on-
2238  * demand" interfaces, this new state identifies the situation where the
2239  * interface is waiting for events to place it in the up state.
2240  *
2241  */
2242 static inline void netif_dormant_on(struct net_device *dev)
2243 {
2244         if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
2245                 linkwatch_fire_event(dev);
2246 }
2247 
2248 /**
2249  *      netif_dormant_off - set device as not dormant.
2250  *      @dev: network device
2251  *
2252  * Device is not in dormant state.
2253  */
2254 static inline void netif_dormant_off(struct net_device *dev)
2255 {
2256         if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
2257                 linkwatch_fire_event(dev);
2258 }
2259 
2260 /**
2261  *      netif_dormant - test if carrier present
2262  *      @dev: network device
2263  *
2264  * Check if carrier is present on device
2265  */
2266 static inline bool netif_dormant(const struct net_device *dev)
2267 {
2268         return test_bit(__LINK_STATE_DORMANT, &dev->state);
2269 }
2270 
2271 
2272 /**
2273  *      netif_oper_up - test if device is operational
2274  *      @dev: network device
2275  *
2276  * Check if carrier is operational
2277  */
2278 static inline bool netif_oper_up(const struct net_device *dev)
2279 {
2280         return (dev->operstate == IF_OPER_UP ||
2281                 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
2282 }
2283 
2284 /**
2285  *      netif_device_present - is device available or removed
2286  *      @dev: network device
2287  *
2288  * Check if device has not been removed from system.
2289  */
2290 static inline bool netif_device_present(struct net_device *dev)
2291 {
2292         return test_bit(__LINK_STATE_PRESENT, &dev->state);
2293 }
2294 
2295 extern void netif_device_detach(struct net_device *dev);
2296 
2297 extern void netif_device_attach(struct net_device *dev);
2298 
2299 /*
2300  * Network interface message level settings
2301  */
2302 
2303 enum {
2304         NETIF_MSG_DRV           = 0x0001,
2305         NETIF_MSG_PROBE         = 0x0002,
2306         NETIF_MSG_LINK          = 0x0004,
2307         NETIF_MSG_TIMER         = 0x0008,
2308         NETIF_MSG_IFDOWN        = 0x0010,
2309         NETIF_MSG_IFUP          = 0x0020,
2310         NETIF_MSG_RX_ERR        = 0x0040,
2311         NETIF_MSG_TX_ERR        = 0x0080,
2312         NETIF_MSG_TX_QUEUED     = 0x0100,
2313         NETIF_MSG_INTR          = 0x0200,
2314         NETIF_MSG_TX_DONE       = 0x0400,
2315         NETIF_MSG_RX_STATUS     = 0x0800,
2316         NETIF_MSG_PKTDATA       = 0x1000,
2317         NETIF_MSG_HW            = 0x2000,
2318         NETIF_MSG_WOL           = 0x4000,
2319 };
2320 
2321 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
2322 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
2323 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
2324 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
2325 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
2326 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
2327 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
2328 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
2329 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
2330 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
2331 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
2332 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
2333 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
2334 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
2335 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
2336 
2337 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
2338 {
2339         /* use default */
2340         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
2341                 return default_msg_enable_bits;
2342         if (debug_value == 0)   /* no output */
2343                 return 0;
2344         /* set low N bits */
2345         return (1 << debug_value) - 1;
2346 }
2347 
2348 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
2349 {
2350         spin_lock(&txq->_xmit_lock);
2351         txq->xmit_lock_owner = cpu;
2352 }
2353 
2354 static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
2355 {
2356         spin_lock_bh(&txq->_xmit_lock);
2357         txq->xmit_lock_owner = smp_processor_id();
2358 }
2359 
2360 static inline bool __netif_tx_trylock(struct netdev_queue *txq)
2361 {
2362         bool ok = spin_trylock(&txq->_xmit_lock);
2363         if (likely(ok))
2364                 txq->xmit_lock_owner = smp_processor_id();
2365         return ok;
2366 }
2367 
2368 static inline void __netif_tx_unlock(struct netdev_queue *txq)
2369 {
2370         txq->xmit_lock_owner = -1;
2371         spin_unlock(&txq->_xmit_lock);
2372 }
2373 
2374 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
2375 {
2376         txq->xmit_lock_owner = -1;
2377         spin_unlock_bh(&txq->_xmit_lock);
2378 }
2379 
2380 static inline void txq_trans_update(struct netdev_queue *txq)
2381 {
2382         if (txq->xmit_lock_owner != -1)
2383                 txq->trans_start = jiffies;
2384 }
2385 
2386 /**
2387  *      netif_tx_lock - grab network device transmit lock
2388  *      @dev: network device
2389  *
2390  * Get network device transmit lock
2391  */
2392 static inline void netif_tx_lock(struct net_device *dev)
2393 {
2394         unsigned int i;
2395         int cpu;
2396 
2397         spin_lock(&dev->tx_global_lock);
2398         cpu = smp_processor_id();
2399         for (i = 0; i < dev->num_tx_queues; i++) {
2400                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2401 
2402                 /* We are the only thread of execution doing a
2403                  * freeze, but we have to grab the _xmit_lock in
2404                  * order to synchronize with threads which are in
2405                  * the ->hard_start_xmit() handler and already
2406                  * checked the frozen bit.
2407                  */
2408                 __netif_tx_lock(txq, cpu);
2409                 set_bit(__QUEUE_STATE_FROZEN, &txq->state);
2410                 __netif_tx_unlock(txq);
2411         }
2412 }
2413 
2414 static inline void netif_tx_lock_bh(struct net_device *dev)
2415 {
2416         local_bh_disable();
2417         netif_tx_lock(dev);
2418 }
2419 
2420 static inline void netif_tx_unlock(struct net_device *dev)
2421 {
2422         unsigned int i;
2423 
2424         for (i = 0; i < dev->num_tx_queues; i++) {
2425                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2426 
2427                 /* No need to grab the _xmit_lock here.  If the
2428                  * queue is not stopped for another reason, we
2429                  * force a schedule.
2430                  */
2431                 clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
2432                 netif_schedule_queue(txq);
2433         }
2434         spin_unlock(&dev->tx_global_lock);
2435 }
2436 
2437 static inline void netif_tx_unlock_bh(struct net_device *dev)
2438 {
2439         netif_tx_unlock(dev);
2440         local_bh_enable();
2441 }
2442 
2443 #define HARD_TX_LOCK(dev, txq, cpu) {                   \
2444         if ((dev->features & NETIF_F_LLTX) == 0) {      \
2445                 __netif_tx_lock(txq, cpu);              \
2446         }                                               \
2447 }
2448 
2449 #define HARD_TX_UNLOCK(dev, txq) {                      \
2450         if ((dev->features & NETIF_F_LLTX) == 0) {      \
2451                 __netif_tx_unlock(txq);                 \
2452         }                                               \
2453 }
2454 
2455 static inline void netif_tx_disable(struct net_device *dev)
2456 {
2457         unsigned int i;
2458         int cpu;
2459 
2460         local_bh_disable();
2461         cpu = smp_processor_id();
2462         for (i = 0; i < dev->num_tx_queues; i++) {
2463                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2464 
2465                 __netif_tx_lock(txq, cpu);
2466                 netif_tx_stop_queue(txq);
2467                 __netif_tx_unlock(txq);
2468         }
2469         local_bh_enable();
2470 }
2471 
2472 static inline void netif_addr_lock(struct net_device *dev)
2473 {
2474         spin_lock(&dev->addr_list_lock);
2475 }
2476 
2477 static inline void netif_addr_lock_nested(struct net_device *dev)
2478 {
2479         spin_lock_nested(&dev->addr_list_lock, SINGLE_DEPTH_NESTING);
2480 }
2481 
2482 static inline void netif_addr_lock_bh(struct net_device *dev)
2483 {
2484         spin_lock_bh(&dev->addr_list_lock);
2485 }
2486 
2487 static inline void netif_addr_unlock(struct net_device *dev)
2488 {
2489         spin_unlock(&dev->addr_list_lock);
2490 }
2491 
2492 static inline void netif_addr_unlock_bh(struct net_device *dev)
2493 {
2494         spin_unlock_bh(&dev->addr_list_lock);
2495 }
2496 
2497 /*
2498  * dev_addrs walker. Should be used only for read access. Call with
2499  * rcu_read_lock held.
2500  */
2501 #define for_each_dev_addr(dev, ha) \
2502                 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2503 
2504 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
2505 
2506 extern void             ether_setup(struct net_device *dev);
2507 
2508 /* Support for loadable net-drivers */
2509 extern struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
2510                                        void (*setup)(struct net_device *),
2511                                        unsigned int txqs, unsigned int rxqs);
2512 #define alloc_netdev(sizeof_priv, name, setup) \
2513         alloc_netdev_mqs(sizeof_priv, name, setup, 1, 1)
2514 
2515 #define alloc_netdev_mq(sizeof_priv, name, setup, count) \
2516         alloc_netdev_mqs(sizeof_priv, name, setup, count, count)
2517 
2518 extern int              register_netdev(struct net_device *dev);
2519 extern void             unregister_netdev(struct net_device *dev);
2520 
2521 /* General hardware address lists handling functions */
2522 extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
2523                                   struct netdev_hw_addr_list *from_list,
2524                                   int addr_len, unsigned char addr_type);
2525 extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
2526                                    struct netdev_hw_addr_list *from_list,
2527                                    int addr_len, unsigned char addr_type);
2528 extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
2529                           struct netdev_hw_addr_list *from_list,
2530                           int addr_len);
2531 extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
2532                              struct netdev_hw_addr_list *from_list,
2533                              int addr_len);
2534 extern void __hw_addr_flush(struct netdev_hw_addr_list *list);
2535 extern void __hw_addr_init(struct netdev_hw_addr_list *list);
2536 
2537 /* Functions used for device addresses handling */
2538 extern int dev_addr_add(struct net_device *dev, unsigned char *addr,
2539                         unsigned char addr_type);
2540 extern int dev_addr_del(struct net_device *dev, unsigned char *addr,
2541                         unsigned char addr_type);
2542 extern int dev_addr_add_multiple(struct net_device *to_dev,
2543                                  struct net_device *from_dev,
2544                                  unsigned char addr_type);
2545 extern int dev_addr_del_multiple(struct net_device *to_dev,
2546                                  struct net_device *from_dev,
2547                                  unsigned char addr_type);
2548 extern void dev_addr_flush(struct net_device *dev);
2549 extern int dev_addr_init(struct net_device *dev);
2550 
2551 /* Functions used for unicast addresses handling */
2552 extern int dev_uc_add(struct net_device *dev, unsigned char *addr);
2553 extern int dev_uc_del(struct net_device *dev, unsigned char *addr);
2554 extern int dev_uc_sync(struct net_device *to, struct net_device *from);
2555 extern void dev_uc_unsync(struct net_device *to, struct net_device *from);
2556 extern void dev_uc_flush(struct net_device *dev);
2557 extern void dev_uc_init(struct net_device *dev);
2558 
2559 /* Functions used for multicast addresses handling */
2560 extern int dev_mc_add(struct net_device *dev, unsigned char *addr);
2561 extern int dev_mc_add_global(struct net_device *dev, unsigned char *addr);
2562 extern int dev_mc_del(struct net_device *dev, unsigned char *addr);
2563 extern int dev_mc_del_global(struct net_device *dev, unsigned char *addr);
2564 extern int dev_mc_sync(struct net_device *to, struct net_device *from);
2565 extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
2566 extern void dev_mc_flush(struct net_device *dev);
2567 extern void dev_mc_init(struct net_device *dev);
2568 
2569 /* Functions used for secondary unicast and multicast support */
2570 extern void             dev_set_rx_mode(struct net_device *dev);
2571 extern void             __dev_set_rx_mode(struct net_device *dev);
2572 extern int              dev_set_promiscuity(struct net_device *dev, int inc);
2573 extern int              dev_set_allmulti(struct net_device *dev, int inc);
2574 extern void             netdev_state_change(struct net_device *dev);
2575 extern int              netdev_bonding_change(struct net_device *dev,
2576                                               unsigned long event);
2577 extern void             netdev_features_change(struct net_device *dev);
2578 /* Load a device via the kmod */
2579 extern void             dev_load(struct net *net, const char *name);
2580 extern void             dev_mcast_init(void);
2581 extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
2582                                                struct rtnl_link_stats64 *storage);
2583 extern void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
2584                                     const struct net_device_stats *netdev_stats);
2585 
2586 extern int              netdev_max_backlog;
2587 extern int              netdev_tstamp_prequeue;
2588 extern int              weight_p;
2589 extern int              bpf_jit_enable;
2590 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
2591 extern int netdev_set_bond_master(struct net_device *dev,
2592                                   struct net_device *master);
2593 extern int skb_checksum_help(struct sk_buff *skb);
2594 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb,
2595         netdev_features_t features);
2596 #ifdef CONFIG_BUG
2597 extern void netdev_rx_csum_fault(struct net_device *dev);
2598 #else
2599 static inline void netdev_rx_csum_fault(struct net_device *dev)
2600 {
2601 }
2602 #endif
2603 /* rx skb timestamps */
2604 extern void             net_enable_timestamp(void);
2605 extern void             net_disable_timestamp(void);
2606 
2607 #ifdef CONFIG_PROC_FS
2608 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
2609 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
2610 extern void dev_seq_stop(struct seq_file *seq, void *v);
2611 #endif
2612 
2613 extern int netdev_class_create_file(struct class_attribute *class_attr);
2614 extern void netdev_class_remove_file(struct class_attribute *class_attr);
2615 
2616 extern struct kobj_ns_type_operations net_ns_type_operations;
2617 
2618 extern const char *netdev_drivername(const struct net_device *dev);
2619 
2620 extern void linkwatch_run_queue(void);
2621 
2622 static inline netdev_features_t netdev_get_wanted_features(
2623         struct net_device *dev)
2624 {
2625         return (dev->features & ~dev->hw_features) | dev->wanted_features;
2626 }
2627 netdev_features_t netdev_increment_features(netdev_features_t all,
2628         netdev_features_t one, netdev_features_t mask);
2629 int __netdev_update_features(struct net_device *dev);
2630 void netdev_update_features(struct net_device *dev);
2631 void netdev_change_features(struct net_device *dev);
2632 
2633 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
2634                                         struct net_device *dev);
2635 
2636 netdev_features_t netif_skb_features(struct sk_buff *skb);
2637 
2638 static inline bool net_gso_ok(netdev_features_t features, int gso_type)
2639 {
2640         netdev_features_t feature = gso_type << NETIF_F_GSO_SHIFT;
2641 
2642         /* check flags correspondence */
2643         BUILD_BUG_ON(SKB_GSO_TCPV4   != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
2644         BUILD_BUG_ON(SKB_GSO_UDP     != (NETIF_F_UFO >> NETIF_F_GSO_SHIFT));
2645         BUILD_BUG_ON(SKB_GSO_DODGY   != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
2646         BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
2647         BUILD_BUG_ON(SKB_GSO_TCPV6   != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
2648         BUILD_BUG_ON(SKB_GSO_FCOE    != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));
2649 
2650         return (features & feature) == feature;
2651 }
2652 
2653 static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
2654 {
2655         return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2656                (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
2657 }
2658 
2659 static inline bool netif_needs_gso(struct sk_buff *skb,
2660                                    netdev_features_t features)
2661 {
2662         return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
2663                 unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
2664                          (skb->ip_summed != CHECKSUM_UNNECESSARY)));
2665 }
2666 
2667 static inline void netif_set_gso_max_size(struct net_device *dev,
2668                                           unsigned int size)
2669 {
2670         dev->gso_max_size = size;
2671 }
2672 
2673 static inline bool netif_is_bond_slave(struct net_device *dev)
2674 {
2675         return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
2676 }
2677 
2678 static inline bool netif_supports_nofcs(struct net_device *dev)
2679 {
2680         return dev->priv_flags & IFF_SUPP_NOFCS;
2681 }
2682 
2683 extern struct pernet_operations __net_initdata loopback_net_ops;
2684 
2685 /* Logging, debugging and troubleshooting/diagnostic helpers. */
2686 
2687 /* netdev_printk helpers, similar to dev_printk */
2688 
2689 static inline const char *netdev_name(const struct net_device *dev)
2690 {
2691         if (dev->reg_state != NETREG_REGISTERED)
2692                 return "(unregistered net_device)";
2693         return dev->name;
2694 }
2695 
2696 extern int __netdev_printk(const char *level, const struct net_device *dev,
2697                         struct va_format *vaf);
2698 
2699 extern __printf(3, 4)
2700 int netdev_printk(const char *level, const struct net_device *dev,
2701                   const char *format, ...);
2702 extern __printf(2, 3)
2703 int netdev_emerg(const struct net_device *dev, const char *format, ...);
2704 extern __printf(2, 3)
2705 int netdev_alert(const struct net_device *dev, const char *format, ...);
2706 extern __printf(2, 3)
2707 int netdev_crit(const struct net_device *dev, const char *format, ...);
2708 extern __printf(2, 3)
2709 int netdev_err(const struct net_device *dev, const char *format, ...);
2710 extern __printf(2, 3)
2711 int netdev_warn(const struct net_device *dev, const char *format, ...);
2712 extern __printf(2, 3)
2713 int netdev_notice(const struct net_device *dev, const char *format, ...);
2714 extern __printf(2, 3)
2715 int netdev_info(const struct net_device *dev, const char *format, ...);
2716 
2717 #define MODULE_ALIAS_NETDEV(device) \
2718         MODULE_ALIAS("netdev-" device)
2719 
2720 #if defined(CONFIG_DYNAMIC_DEBUG)
2721 #define netdev_dbg(__dev, format, args...)                      \
2722 do {                                                            \
2723         dynamic_netdev_dbg(__dev, format, ##args);              \
2724 } while (0)
2725 #elif defined(DEBUG)
2726 #define netdev_dbg(__dev, format, args...)                      \
2727         netdev_printk(KERN_DEBUG, __dev, format, ##args)
2728 #else
2729 #define netdev_dbg(__dev, format, args...)                      \
2730 ({                                                              \
2731         if (0)                                                  \
2732                 netdev_printk(KERN_DEBUG, __dev, format, ##args); \
2733         0;                                                      \
2734 })
2735 #endif
2736 
2737 #if defined(VERBOSE_DEBUG)
2738 #define netdev_vdbg     netdev_dbg
2739 #else
2740 
2741 #define netdev_vdbg(dev, format, args...)                       \
2742 ({                                                              \
2743         if (0)                                                  \
2744                 netdev_printk(KERN_DEBUG, dev, format, ##args); \
2745         0;                                                      \
2746 })
2747 #endif
2748 
2749 /*
2750  * netdev_WARN() acts like dev_printk(), but with the key difference
2751  * of using a WARN/WARN_ON to get the message out, including the
2752  * file/line information and a backtrace.
2753  */
2754 #define netdev_WARN(dev, format, args...)                       \
2755         WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args);
2756 
2757 /* netif printk helpers, similar to netdev_printk */
2758 
2759 #define netif_printk(priv, type, level, dev, fmt, args...)      \
2760 do {                                                            \
2761         if (netif_msg_##type(priv))                             \
2762                 netdev_printk(level, (dev), fmt, ##args);       \
2763 } while (0)
2764 
2765 #define netif_level(level, priv, type, dev, fmt, args...)       \
2766 do {                                                            \
2767         if (netif_msg_##type(priv))                             \
2768                 netdev_##level(dev, fmt, ##args);               \
2769 } while (0)
2770 
2771 #define netif_emerg(priv, type, dev, fmt, args...)              \
2772         netif_level(emerg, priv, type, dev, fmt, ##args)
2773 #define netif_alert(priv, type, dev, fmt, args...)              \
2774         netif_level(alert, priv, type, dev, fmt, ##args)
2775 #define netif_crit(priv, type, dev, fmt, args...)               \
2776         netif_level(crit, priv, type, dev, fmt, ##args)
2777 #define netif_err(priv, type, dev, fmt, args...)                \
2778         netif_level(err, priv, type, dev, fmt, ##args)
2779 #define netif_warn(priv, type, dev, fmt, args...)               \
2780         netif_level(warn, priv, type, dev, fmt, ##args)
2781 #define netif_notice(priv, type, dev, fmt, args...)             \
2782         netif_level(notice, priv, type, dev, fmt, ##args)
2783 #define netif_info(priv, type, dev, fmt, args...)               \
2784         netif_level(info, priv, type, dev, fmt, ##args)
2785 
2786 #if defined(DEBUG)
2787 #define netif_dbg(priv, type, dev, format, args...)             \
2788         netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
2789 #elif defined(CONFIG_DYNAMIC_DEBUG)
2790 #define netif_dbg(priv, type, netdev, format, args...)          \
2791 do {                                                            \
2792         if (netif_msg_##type(priv))                             \
2793                 dynamic_netdev_dbg(netdev, format, ##args);     \
2794 } while (0)
2795 #else
2796 #define netif_dbg(priv, type, dev, format, args...)                     \
2797 ({                                                                      \
2798         if (0)                                                          \
2799                 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2800         0;                                                              \
2801 })
2802 #endif
2803 
2804 #if defined(VERBOSE_DEBUG)
2805 #define netif_vdbg      netif_dbg
2806 #else
2807 #define netif_vdbg(priv, type, dev, format, args...)            \
2808 ({                                                              \
2809         if (0)                                                  \
2810                 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2811         0;                                                      \
2812 })
2813 #endif
2814 
2815 #endif /* __KERNEL__ */
2816 
2817 #endif  /* _LINUX_NETDEVICE_H */
2818 

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