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Linux/include/linux/netdevice.h

  1 /*
  2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
  3  *              operating system.  INET is implemented using the  BSD Socket
  4  *              interface as the means of communication with the user level.
  5  *
  6  *              Definitions for the Interfaces handler.
  7  *
  8  * Version:     @(#)dev.h       1.0.10  08/12/93
  9  *
 10  * Authors:     Ross Biro
 11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 12  *              Corey Minyard <wf-rch!minyard@relay.EU.net>
 13  *              Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
 14  *              Alan Cox, <alan@lxorguk.ukuu.org.uk>
 15  *              Bjorn Ekwall. <bj0rn@blox.se>
 16  *              Pekka Riikonen <priikone@poseidon.pspt.fi>
 17  *
 18  *              This program is free software; you can redistribute it and/or
 19  *              modify it under the terms of the GNU General Public License
 20  *              as published by the Free Software Foundation; either version
 21  *              2 of the License, or (at your option) any later version.
 22  *
 23  *              Moved to /usr/include/linux for NET3
 24  */
 25 #ifndef _LINUX_NETDEVICE_H
 26 #define _LINUX_NETDEVICE_H
 27 
 28 #include <linux/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_params.h>
 35 #include <linux/timer.h>
 36 #include <linux/delay.h>
 37 #include <linux/mm.h>
 38 #include <asm/atomic.h>
 39 #include <asm/cache.h>
 40 #include <asm/byteorder.h>
 41 
 42 #include <linux/device.h>
 43 #include <linux/percpu.h>
 44 #include <linux/rculist.h>
 45 #include <linux/dmaengine.h>
 46 #include <linux/workqueue.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 
 55 struct vlan_group;
 56 struct netpoll_info;
 57 /* 802.11 specific */
 58 struct wireless_dev;
 59                                         /* source back-compat hooks */
 60 #define SET_ETHTOOL_OPS(netdev,ops) \
 61         ( (netdev)->ethtool_ops = (ops) )
 62 
 63 #define HAVE_ALLOC_NETDEV               /* feature macro: alloc_xxxdev
 64                                            functions are available. */
 65 #define HAVE_FREE_NETDEV                /* free_netdev() */
 66 #define HAVE_NETDEV_PRIV                /* netdev_priv() */
 67 
 68 /* Backlog congestion levels */
 69 #define NET_RX_SUCCESS          0       /* keep 'em coming, baby */
 70 #define NET_RX_DROP             1       /* packet dropped */
 71 
 72 /*
 73  * Transmit return codes: transmit return codes originate from three different
 74  * namespaces:
 75  *
 76  * - qdisc return codes
 77  * - driver transmit return codes
 78  * - errno values
 79  *
 80  * Drivers are allowed to return any one of those in their hard_start_xmit()
 81  * function. Real network devices commonly used with qdiscs should only return
 82  * the driver transmit return codes though - when qdiscs are used, the actual
 83  * transmission happens asynchronously, so the value is not propagated to
 84  * higher layers. Virtual network devices transmit synchronously, in this case
 85  * the driver transmit return codes are consumed by dev_queue_xmit(), all
 86  * others are propagated to higher layers.
 87  */
 88 
 89 /* qdisc ->enqueue() return codes. */
 90 #define NET_XMIT_SUCCESS        0x00
 91 #define NET_XMIT_DROP           0x01    /* skb dropped                  */
 92 #define NET_XMIT_CN             0x02    /* congestion notification      */
 93 #define NET_XMIT_POLICED        0x03    /* skb is shot by police        */
 94 #define NET_XMIT_MASK           0x0f    /* qdisc flags in net/sch_generic.h */
 95 
 96 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
 97  * indicates that the device will soon be dropping packets, or already drops
 98  * some packets of the same priority; prompting us to send less aggressively. */
 99 #define net_xmit_eval(e)        ((e) == NET_XMIT_CN ? 0 : (e))
100 #define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
101 
102 /* Driver transmit return codes */
103 #define NETDEV_TX_MASK          0xf0
104 
105 enum netdev_tx {
106         __NETDEV_TX_MIN  = INT_MIN,     /* make sure enum is signed */
107         NETDEV_TX_OK     = 0x00,        /* driver took care of packet */
108         NETDEV_TX_BUSY   = 0x10,        /* driver tx path was busy*/
109         NETDEV_TX_LOCKED = 0x20,        /* driver tx lock was already taken */
110 };
111 typedef enum netdev_tx netdev_tx_t;
112 
113 /*
114  * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
115  * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
116  */
117 static inline bool dev_xmit_complete(int rc)
118 {
119         /*
120          * Positive cases with an skb consumed by a driver:
121          * - successful transmission (rc == NETDEV_TX_OK)
122          * - error while transmitting (rc < 0)
123          * - error while queueing to a different device (rc & NET_XMIT_MASK)
124          */
125         if (likely(rc < NET_XMIT_MASK))
126                 return true;
127 
128         return false;
129 }
130 
131 #endif
132 
133 #define MAX_ADDR_LEN    32              /* Largest hardware address length */
134 
135 #ifdef  __KERNEL__
136 /*
137  *      Compute the worst case header length according to the protocols
138  *      used.
139  */
140 
141 #if defined(CONFIG_WLAN) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
142 # if defined(CONFIG_MAC80211_MESH)
143 #  define LL_MAX_HEADER 128
144 # else
145 #  define LL_MAX_HEADER 96
146 # endif
147 #elif defined(CONFIG_TR) || defined(CONFIG_TR_MODULE)
148 # define LL_MAX_HEADER 48
149 #else
150 # define LL_MAX_HEADER 32
151 #endif
152 
153 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
154     !defined(CONFIG_NET_IPGRE) &&  !defined(CONFIG_NET_IPGRE_MODULE) && \
155     !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
156     !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
157 #define MAX_HEADER LL_MAX_HEADER
158 #else
159 #define MAX_HEADER (LL_MAX_HEADER + 48)
160 #endif
161 
162 #endif  /*  __KERNEL__  */
163 
164 /*
165  *      Network device statistics. Akin to the 2.0 ether stats but
166  *      with byte counters.
167  */
168 
169 struct net_device_stats {
170         unsigned long   rx_packets;             /* total packets received       */
171         unsigned long   tx_packets;             /* total packets transmitted    */
172         unsigned long   rx_bytes;               /* total bytes received         */
173         unsigned long   tx_bytes;               /* total bytes transmitted      */
174         unsigned long   rx_errors;              /* bad packets received         */
175         unsigned long   tx_errors;              /* packet transmit problems     */
176         unsigned long   rx_dropped;             /* no space in linux buffers    */
177         unsigned long   tx_dropped;             /* no space available in linux  */
178         unsigned long   multicast;              /* multicast packets received   */
179         unsigned long   collisions;
180 
181         /* detailed rx_errors: */
182         unsigned long   rx_length_errors;
183         unsigned long   rx_over_errors;         /* receiver ring buff overflow  */
184         unsigned long   rx_crc_errors;          /* recved pkt with crc error    */
185         unsigned long   rx_frame_errors;        /* recv'd frame alignment error */
186         unsigned long   rx_fifo_errors;         /* recv'r fifo overrun          */
187         unsigned long   rx_missed_errors;       /* receiver missed packet       */
188 
189         /* detailed tx_errors */
190         unsigned long   tx_aborted_errors;
191         unsigned long   tx_carrier_errors;
192         unsigned long   tx_fifo_errors;
193         unsigned long   tx_heartbeat_errors;
194         unsigned long   tx_window_errors;
195         
196         /* for cslip etc */
197         unsigned long   rx_compressed;
198         unsigned long   tx_compressed;
199 };
200 
201 
202 /* Media selection options. */
203 enum {
204         IF_PORT_UNKNOWN = 0,
205         IF_PORT_10BASE2,
206         IF_PORT_10BASET,
207         IF_PORT_AUI,
208         IF_PORT_100BASET,
209         IF_PORT_100BASETX,
210         IF_PORT_100BASEFX
211 };
212 
213 #ifdef __KERNEL__
214 
215 #include <linux/cache.h>
216 #include <linux/skbuff.h>
217 
218 struct neighbour;
219 struct neigh_parms;
220 struct sk_buff;
221 
222 struct netdev_hw_addr {
223         struct list_head        list;
224         unsigned char           addr[MAX_ADDR_LEN];
225         unsigned char           type;
226 #define NETDEV_HW_ADDR_T_LAN            1
227 #define NETDEV_HW_ADDR_T_SAN            2
228 #define NETDEV_HW_ADDR_T_SLAVE          3
229 #define NETDEV_HW_ADDR_T_UNICAST        4
230 #define NETDEV_HW_ADDR_T_MULTICAST      5
231         int                     refcount;
232         bool                    synced;
233         bool                    global_use;
234         struct rcu_head         rcu_head;
235 };
236 
237 struct netdev_hw_addr_list {
238         struct list_head        list;
239         int                     count;
240 };
241 
242 #define netdev_hw_addr_list_count(l) ((l)->count)
243 #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
244 #define netdev_hw_addr_list_for_each(ha, l) \
245         list_for_each_entry(ha, &(l)->list, list)
246 
247 #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
248 #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
249 #define netdev_for_each_uc_addr(ha, dev) \
250         netdev_hw_addr_list_for_each(ha, &(dev)->uc)
251 
252 #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
253 #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
254 #define netdev_for_each_mc_addr(ha, dev) \
255         netdev_hw_addr_list_for_each(ha, &(dev)->mc)
256 
257 struct hh_cache {
258         struct hh_cache *hh_next;       /* Next entry                        */
259         atomic_t        hh_refcnt;      /* number of users                   */
260 /*
261  * We want hh_output, hh_len, hh_lock and hh_data be a in a separate
262  * cache line on SMP.
263  * They are mostly read, but hh_refcnt may be changed quite frequently,
264  * incurring cache line ping pongs.
265  */
266         __be16          hh_type ____cacheline_aligned_in_smp;
267                                         /* protocol identifier, f.e ETH_P_IP
268                                          *  NOTE:  For VLANs, this will be the
269                                          *  encapuslated type. --BLG
270                                          */
271         u16             hh_len;         /* length of header */
272         int             (*hh_output)(struct sk_buff *skb);
273         seqlock_t       hh_lock;
274 
275         /* cached hardware header; allow for machine alignment needs.        */
276 #define HH_DATA_MOD     16
277 #define HH_DATA_OFF(__len) \
278         (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
279 #define HH_DATA_ALIGN(__len) \
280         (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
281         unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
282 };
283 
284 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
285  * Alternative is:
286  *   dev->hard_header_len ? (dev->hard_header_len +
287  *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
288  *
289  * We could use other alignment values, but we must maintain the
290  * relationship HH alignment <= LL alignment.
291  *
292  * LL_ALLOCATED_SPACE also takes into account the tailroom the device
293  * may need.
294  */
295 #define LL_RESERVED_SPACE(dev) \
296         ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
297 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
298         ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
299 #define LL_ALLOCATED_SPACE(dev) \
300         ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
301 
302 struct header_ops {
303         int     (*create) (struct sk_buff *skb, struct net_device *dev,
304                            unsigned short type, const void *daddr,
305                            const void *saddr, unsigned len);
306         int     (*parse)(const struct sk_buff *skb, unsigned char *haddr);
307         int     (*rebuild)(struct sk_buff *skb);
308 #define HAVE_HEADER_CACHE
309         int     (*cache)(const struct neighbour *neigh, struct hh_cache *hh);
310         void    (*cache_update)(struct hh_cache *hh,
311                                 const struct net_device *dev,
312                                 const unsigned char *haddr);
313 };
314 
315 /* These flag bits are private to the generic network queueing
316  * layer, they may not be explicitly referenced by any other
317  * code.
318  */
319 
320 enum netdev_state_t {
321         __LINK_STATE_START,
322         __LINK_STATE_PRESENT,
323         __LINK_STATE_NOCARRIER,
324         __LINK_STATE_LINKWATCH_PENDING,
325         __LINK_STATE_DORMANT,
326 };
327 
328 
329 /*
330  * This structure holds at boot time configured netdevice settings. They
331  * are then used in the device probing.
332  */
333 struct netdev_boot_setup {
334         char name[IFNAMSIZ];
335         struct ifmap map;
336 };
337 #define NETDEV_BOOT_SETUP_MAX 8
338 
339 extern int __init netdev_boot_setup(char *str);
340 
341 /*
342  * Structure for NAPI scheduling similar to tasklet but with weighting
343  */
344 struct napi_struct {
345         /* The poll_list must only be managed by the entity which
346          * changes the state of the NAPI_STATE_SCHED bit.  This means
347          * whoever atomically sets that bit can add this napi_struct
348          * to the per-cpu poll_list, and whoever clears that bit
349          * can remove from the list right before clearing the bit.
350          */
351         struct list_head        poll_list;
352 
353         unsigned long           state;
354         int                     weight;
355         int                     (*poll)(struct napi_struct *, int);
356 #ifdef CONFIG_NETPOLL
357         spinlock_t              poll_lock;
358         int                     poll_owner;
359 #endif
360 
361         unsigned int            gro_count;
362 
363         struct net_device       *dev;
364         struct list_head        dev_list;
365         struct sk_buff          *gro_list;
366         struct sk_buff          *skb;
367 };
368 
369 enum {
370         NAPI_STATE_SCHED,       /* Poll is scheduled */
371         NAPI_STATE_DISABLE,     /* Disable pending */
372         NAPI_STATE_NPSVC,       /* Netpoll - don't dequeue from poll_list */
373 };
374 
375 enum gro_result {
376         GRO_MERGED,
377         GRO_MERGED_FREE,
378         GRO_HELD,
379         GRO_NORMAL,
380         GRO_DROP,
381 };
382 typedef enum gro_result gro_result_t;
383 
384 extern void __napi_schedule(struct napi_struct *n);
385 
386 static inline int napi_disable_pending(struct napi_struct *n)
387 {
388         return test_bit(NAPI_STATE_DISABLE, &n->state);
389 }
390 
391 /**
392  *      napi_schedule_prep - check if napi can be scheduled
393  *      @n: napi context
394  *
395  * Test if NAPI routine is already running, and if not mark
396  * it as running.  This is used as a condition variable
397  * insure only one NAPI poll instance runs.  We also make
398  * sure there is no pending NAPI disable.
399  */
400 static inline int napi_schedule_prep(struct napi_struct *n)
401 {
402         return !napi_disable_pending(n) &&
403                 !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
404 }
405 
406 /**
407  *      napi_schedule - schedule NAPI poll
408  *      @n: napi context
409  *
410  * Schedule NAPI poll routine to be called if it is not already
411  * running.
412  */
413 static inline void napi_schedule(struct napi_struct *n)
414 {
415         if (napi_schedule_prep(n))
416                 __napi_schedule(n);
417 }
418 
419 /* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
420 static inline int napi_reschedule(struct napi_struct *napi)
421 {
422         if (napi_schedule_prep(napi)) {
423                 __napi_schedule(napi);
424                 return 1;
425         }
426         return 0;
427 }
428 
429 /**
430  *      napi_complete - NAPI processing complete
431  *      @n: napi context
432  *
433  * Mark NAPI processing as complete.
434  */
435 extern void __napi_complete(struct napi_struct *n);
436 extern void napi_complete(struct napi_struct *n);
437 
438 /**
439  *      napi_disable - prevent NAPI from scheduling
440  *      @n: napi context
441  *
442  * Stop NAPI from being scheduled on this context.
443  * Waits till any outstanding processing completes.
444  */
445 static inline void napi_disable(struct napi_struct *n)
446 {
447         set_bit(NAPI_STATE_DISABLE, &n->state);
448         while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
449                 msleep(1);
450         clear_bit(NAPI_STATE_DISABLE, &n->state);
451 }
452 
453 /**
454  *      napi_enable - enable NAPI scheduling
455  *      @n: napi context
456  *
457  * Resume NAPI from being scheduled on this context.
458  * Must be paired with napi_disable.
459  */
460 static inline void napi_enable(struct napi_struct *n)
461 {
462         BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
463         smp_mb__before_clear_bit();
464         clear_bit(NAPI_STATE_SCHED, &n->state);
465 }
466 
467 #ifdef CONFIG_SMP
468 /**
469  *      napi_synchronize - wait until NAPI is not running
470  *      @n: napi context
471  *
472  * Wait until NAPI is done being scheduled on this context.
473  * Waits till any outstanding processing completes but
474  * does not disable future activations.
475  */
476 static inline void napi_synchronize(const struct napi_struct *n)
477 {
478         while (test_bit(NAPI_STATE_SCHED, &n->state))
479                 msleep(1);
480 }
481 #else
482 # define napi_synchronize(n)    barrier()
483 #endif
484 
485 enum netdev_queue_state_t {
486         __QUEUE_STATE_XOFF,
487         __QUEUE_STATE_FROZEN,
488 };
489 
490 struct netdev_queue {
491 /*
492  * read mostly part
493  */
494         struct net_device       *dev;
495         struct Qdisc            *qdisc;
496         unsigned long           state;
497         struct Qdisc            *qdisc_sleeping;
498 /*
499  * write mostly part
500  */
501         spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
502         int                     xmit_lock_owner;
503         /*
504          * please use this field instead of dev->trans_start
505          */
506         unsigned long           trans_start;
507         unsigned long           tx_bytes;
508         unsigned long           tx_packets;
509         unsigned long           tx_dropped;
510 } ____cacheline_aligned_in_smp;
511 
512 #ifdef CONFIG_RPS
513 /*
514  * This structure holds an RPS map which can be of variable length.  The
515  * map is an array of CPUs.
516  */
517 struct rps_map {
518         unsigned int len;
519         struct rcu_head rcu;
520         u16 cpus[0];
521 };
522 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + (_num * sizeof(u16)))
523 
524 /*
525  * The rps_dev_flow structure contains the mapping of a flow to a CPU and the
526  * tail pointer for that CPU's input queue at the time of last enqueue.
527  */
528 struct rps_dev_flow {
529         u16 cpu;
530         u16 fill;
531         unsigned int last_qtail;
532 };
533 
534 /*
535  * The rps_dev_flow_table structure contains a table of flow mappings.
536  */
537 struct rps_dev_flow_table {
538         unsigned int mask;
539         struct rcu_head rcu;
540         struct work_struct free_work;
541         struct rps_dev_flow flows[0];
542 };
543 #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
544     (_num * sizeof(struct rps_dev_flow)))
545 
546 /*
547  * The rps_sock_flow_table contains mappings of flows to the last CPU
548  * on which they were processed by the application (set in recvmsg).
549  */
550 struct rps_sock_flow_table {
551         unsigned int mask;
552         u16 ents[0];
553 };
554 #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \
555     (_num * sizeof(u16)))
556 
557 #define RPS_NO_CPU 0xffff
558 
559 static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
560                                         u32 hash)
561 {
562         if (table && hash) {
563                 unsigned int cpu, index = hash & table->mask;
564 
565                 /* We only give a hint, preemption can change cpu under us */
566                 cpu = raw_smp_processor_id();
567 
568                 if (table->ents[index] != cpu)
569                         table->ents[index] = cpu;
570         }
571 }
572 
573 static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table,
574                                        u32 hash)
575 {
576         if (table && hash)
577                 table->ents[hash & table->mask] = RPS_NO_CPU;
578 }
579 
580 extern struct rps_sock_flow_table *rps_sock_flow_table;
581 
582 /* This structure contains an instance of an RX queue. */
583 struct netdev_rx_queue {
584         struct rps_map *rps_map;
585         struct rps_dev_flow_table *rps_flow_table;
586         struct kobject kobj;
587         struct netdev_rx_queue *first;
588         atomic_t count;
589 } ____cacheline_aligned_in_smp;
590 #endif /* CONFIG_RPS */
591 
592 /*
593  * This structure defines the management hooks for network devices.
594  * The following hooks can be defined; unless noted otherwise, they are
595  * optional and can be filled with a null pointer.
596  *
597  * int (*ndo_init)(struct net_device *dev);
598  *     This function is called once when network device is registered.
599  *     The network device can use this to any late stage initializaton
600  *     or semantic validattion. It can fail with an error code which will
601  *     be propogated back to register_netdev
602  *
603  * void (*ndo_uninit)(struct net_device *dev);
604  *     This function is called when device is unregistered or when registration
605  *     fails. It is not called if init fails.
606  *
607  * int (*ndo_open)(struct net_device *dev);
608  *     This function is called when network device transistions to the up
609  *     state.
610  *
611  * int (*ndo_stop)(struct net_device *dev);
612  *     This function is called when network device transistions to the down
613  *     state.
614  *
615  * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
616  *                               struct net_device *dev);
617  *      Called when a packet needs to be transmitted.
618  *      Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
619  *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
620  *      Required can not be NULL.
621  *
622  * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
623  *      Called to decide which queue to when device supports multiple
624  *      transmit queues.
625  *
626  * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
627  *      This function is called to allow device receiver to make
628  *      changes to configuration when multicast or promiscious is enabled.
629  *
630  * void (*ndo_set_rx_mode)(struct net_device *dev);
631  *      This function is called device changes address list filtering.
632  *
633  * void (*ndo_set_multicast_list)(struct net_device *dev);
634  *      This function is called when the multicast address list changes.
635  *
636  * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
637  *      This function  is called when the Media Access Control address
638  *      needs to be changed. If this interface is not defined, the
639  *      mac address can not be changed.
640  *
641  * int (*ndo_validate_addr)(struct net_device *dev);
642  *      Test if Media Access Control address is valid for the device.
643  *
644  * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
645  *      Called when a user request an ioctl which can't be handled by
646  *      the generic interface code. If not defined ioctl's return
647  *      not supported error code.
648  *
649  * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
650  *      Used to set network devices bus interface parameters. This interface
651  *      is retained for legacy reason, new devices should use the bus
652  *      interface (PCI) for low level management.
653  *
654  * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
655  *      Called when a user wants to change the Maximum Transfer Unit
656  *      of a device. If not defined, any request to change MTU will
657  *      will return an error.
658  *
659  * void (*ndo_tx_timeout)(struct net_device *dev);
660  *      Callback uses when the transmitter has not made any progress
661  *      for dev->watchdog ticks.
662  *
663  * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
664  *      Called when a user wants to get the network device usage
665  *      statistics. If not defined, the counters in dev->stats will
666  *      be used.
667  *
668  * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp);
669  *      If device support VLAN receive accleration
670  *      (ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called
671  *      when vlan groups for the device changes.  Note: grp is NULL
672  *      if no vlan's groups are being used.
673  *
674  * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
675  *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
676  *      this function is called when a VLAN id is registered.
677  *
678  * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
679  *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
680  *      this function is called when a VLAN id is unregistered.
681  *
682  * void (*ndo_poll_controller)(struct net_device *dev);
683  *
684  *      SR-IOV management functions.
685  * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
686  * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
687  * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
688  * int (*ndo_get_vf_config)(struct net_device *dev,
689  *                          int vf, struct ifla_vf_info *ivf);
690  * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
691  *                        struct nlattr *port[]);
692  * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
693  */
694 #define HAVE_NET_DEVICE_OPS
695 struct net_device_ops {
696         int                     (*ndo_init)(struct net_device *dev);
697         void                    (*ndo_uninit)(struct net_device *dev);
698         int                     (*ndo_open)(struct net_device *dev);
699         int                     (*ndo_stop)(struct net_device *dev);
700         netdev_tx_t             (*ndo_start_xmit) (struct sk_buff *skb,
701                                                    struct net_device *dev);
702         u16                     (*ndo_select_queue)(struct net_device *dev,
703                                                     struct sk_buff *skb);
704         void                    (*ndo_change_rx_flags)(struct net_device *dev,
705                                                        int flags);
706         void                    (*ndo_set_rx_mode)(struct net_device *dev);
707         void                    (*ndo_set_multicast_list)(struct net_device *dev);
708         int                     (*ndo_set_mac_address)(struct net_device *dev,
709                                                        void *addr);
710         int                     (*ndo_validate_addr)(struct net_device *dev);
711         int                     (*ndo_do_ioctl)(struct net_device *dev,
712                                                 struct ifreq *ifr, int cmd);
713         int                     (*ndo_set_config)(struct net_device *dev,
714                                                   struct ifmap *map);
715         int                     (*ndo_change_mtu)(struct net_device *dev,
716                                                   int new_mtu);
717         int                     (*ndo_neigh_setup)(struct net_device *dev,
718                                                    struct neigh_parms *);
719         void                    (*ndo_tx_timeout) (struct net_device *dev);
720 
721         struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
722 
723         void                    (*ndo_vlan_rx_register)(struct net_device *dev,
724                                                         struct vlan_group *grp);
725         void                    (*ndo_vlan_rx_add_vid)(struct net_device *dev,
726                                                        unsigned short vid);
727         void                    (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
728                                                         unsigned short vid);
729 #ifdef CONFIG_NET_POLL_CONTROLLER
730         void                    (*ndo_poll_controller)(struct net_device *dev);
731         void                    (*ndo_netpoll_cleanup)(struct net_device *dev);
732 #endif
733         int                     (*ndo_set_vf_mac)(struct net_device *dev,
734                                                   int queue, u8 *mac);
735         int                     (*ndo_set_vf_vlan)(struct net_device *dev,
736                                                    int queue, u16 vlan, u8 qos);
737         int                     (*ndo_set_vf_tx_rate)(struct net_device *dev,
738                                                       int vf, int rate);
739         int                     (*ndo_get_vf_config)(struct net_device *dev,
740                                                      int vf,
741                                                      struct ifla_vf_info *ivf);
742         int                     (*ndo_set_vf_port)(struct net_device *dev,
743                                                    int vf,
744                                                    struct nlattr *port[]);
745         int                     (*ndo_get_vf_port)(struct net_device *dev,
746                                                    int vf, struct sk_buff *skb);
747 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
748         int                     (*ndo_fcoe_enable)(struct net_device *dev);
749         int                     (*ndo_fcoe_disable)(struct net_device *dev);
750         int                     (*ndo_fcoe_ddp_setup)(struct net_device *dev,
751                                                       u16 xid,
752                                                       struct scatterlist *sgl,
753                                                       unsigned int sgc);
754         int                     (*ndo_fcoe_ddp_done)(struct net_device *dev,
755                                                      u16 xid);
756 #define NETDEV_FCOE_WWNN 0
757 #define NETDEV_FCOE_WWPN 1
758         int                     (*ndo_fcoe_get_wwn)(struct net_device *dev,
759                                                     u64 *wwn, int type);
760 #endif
761 };
762 
763 /*
764  *      The DEVICE structure.
765  *      Actually, this whole structure is a big mistake.  It mixes I/O
766  *      data with strictly "high-level" data, and it has to know about
767  *      almost every data structure used in the INET module.
768  *
769  *      FIXME: cleanup struct net_device such that network protocol info
770  *      moves out.
771  */
772 
773 struct net_device {
774 
775         /*
776          * This is the first field of the "visible" part of this structure
777          * (i.e. as seen by users in the "Space.c" file).  It is the name
778          * the interface.
779          */
780         char                    name[IFNAMSIZ];
781 
782         struct pm_qos_request_list *pm_qos_req;
783 
784         /* device name hash chain */
785         struct hlist_node       name_hlist;
786         /* snmp alias */
787         char                    *ifalias;
788 
789         /*
790          *      I/O specific fields
791          *      FIXME: Merge these and struct ifmap into one
792          */
793         unsigned long           mem_end;        /* shared mem end       */
794         unsigned long           mem_start;      /* shared mem start     */
795         unsigned long           base_addr;      /* device I/O address   */
796         unsigned int            irq;            /* device IRQ number    */
797 
798         /*
799          *      Some hardware also needs these fields, but they are not
800          *      part of the usual set specified in Space.c.
801          */
802 
803         unsigned char           if_port;        /* Selectable AUI, TP,..*/
804         unsigned char           dma;            /* DMA channel          */
805 
806         unsigned long           state;
807 
808         struct list_head        dev_list;
809         struct list_head        napi_list;
810         struct list_head        unreg_list;
811 
812         /* Net device features */
813         unsigned long           features;
814 #define NETIF_F_SG              1       /* Scatter/gather IO. */
815 #define NETIF_F_IP_CSUM         2       /* Can checksum TCP/UDP over IPv4. */
816 #define NETIF_F_NO_CSUM         4       /* Does not require checksum. F.e. loopack. */
817 #define NETIF_F_HW_CSUM         8       /* Can checksum all the packets. */
818 #define NETIF_F_IPV6_CSUM       16      /* Can checksum TCP/UDP over IPV6 */
819 #define NETIF_F_HIGHDMA         32      /* Can DMA to high memory. */
820 #define NETIF_F_FRAGLIST        64      /* Scatter/gather IO. */
821 #define NETIF_F_HW_VLAN_TX      128     /* Transmit VLAN hw acceleration */
822 #define NETIF_F_HW_VLAN_RX      256     /* Receive VLAN hw acceleration */
823 #define NETIF_F_HW_VLAN_FILTER  512     /* Receive filtering on VLAN */
824 #define NETIF_F_VLAN_CHALLENGED 1024    /* Device cannot handle VLAN packets */
825 #define NETIF_F_GSO             2048    /* Enable software GSO. */
826 #define NETIF_F_LLTX            4096    /* LockLess TX - deprecated. Please */
827                                         /* do not use LLTX in new drivers */
828 #define NETIF_F_NETNS_LOCAL     8192    /* Does not change network namespaces */
829 #define NETIF_F_GRO             16384   /* Generic receive offload */
830 #define NETIF_F_LRO             32768   /* large receive offload */
831 
832 /* the GSO_MASK reserves bits 16 through 23 */
833 #define NETIF_F_FCOE_CRC        (1 << 24) /* FCoE CRC32 */
834 #define NETIF_F_SCTP_CSUM       (1 << 25) /* SCTP checksum offload */
835 #define NETIF_F_FCOE_MTU        (1 << 26) /* Supports max FCoE MTU, 2158 bytes*/
836 #define NETIF_F_NTUPLE          (1 << 27) /* N-tuple filters supported */
837 #define NETIF_F_RXHASH          (1 << 28) /* Receive hashing offload */
838 
839         /* Segmentation offload features */
840 #define NETIF_F_GSO_SHIFT       16
841 #define NETIF_F_GSO_MASK        0x00ff0000
842 #define NETIF_F_TSO             (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
843 #define NETIF_F_UFO             (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
844 #define NETIF_F_GSO_ROBUST      (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
845 #define NETIF_F_TSO_ECN         (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
846 #define NETIF_F_TSO6            (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
847 #define NETIF_F_FSO             (SKB_GSO_FCOE << NETIF_F_GSO_SHIFT)
848 
849         /* List of features with software fallbacks. */
850 #define NETIF_F_GSO_SOFTWARE    (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
851 
852 
853 #define NETIF_F_GEN_CSUM        (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
854 #define NETIF_F_V4_CSUM         (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
855 #define NETIF_F_V6_CSUM         (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
856 #define NETIF_F_ALL_CSUM        (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
857 
858         /*
859          * If one device supports one of these features, then enable them
860          * for all in netdev_increment_features.
861          */
862 #define NETIF_F_ONE_FOR_ALL     (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \
863                                  NETIF_F_SG | NETIF_F_HIGHDMA |         \
864                                  NETIF_F_FRAGLIST)
865 
866         /* Interface index. Unique device identifier    */
867         int                     ifindex;
868         int                     iflink;
869 
870         struct net_device_stats stats;
871 
872 #ifdef CONFIG_WIRELESS_EXT
873         /* List of functions to handle Wireless Extensions (instead of ioctl).
874          * See <net/iw_handler.h> for details. Jean II */
875         const struct iw_handler_def *   wireless_handlers;
876         /* Instance data managed by the core of Wireless Extensions. */
877         struct iw_public_data * wireless_data;
878 #endif
879         /* Management operations */
880         const struct net_device_ops *netdev_ops;
881         const struct ethtool_ops *ethtool_ops;
882 
883         /* Hardware header description */
884         const struct header_ops *header_ops;
885 
886         unsigned int            flags;  /* interface flags (a la BSD)   */
887         unsigned short          gflags;
888         unsigned short          priv_flags; /* Like 'flags' but invisible to userspace. */
889         unsigned short          padded; /* How much padding added by alloc_netdev() */
890 
891         unsigned char           operstate; /* RFC2863 operstate */
892         unsigned char           link_mode; /* mapping policy to operstate */
893 
894         unsigned int            mtu;    /* interface MTU value          */
895         unsigned short          type;   /* interface hardware type      */
896         unsigned short          hard_header_len;        /* hardware hdr length  */
897 
898         /* extra head- and tailroom the hardware may need, but not in all cases
899          * can this be guaranteed, especially tailroom. Some cases also use
900          * LL_MAX_HEADER instead to allocate the skb.
901          */
902         unsigned short          needed_headroom;
903         unsigned short          needed_tailroom;
904 
905         struct net_device       *master; /* Pointer to master device of a group,
906                                           * which this device is member of.
907                                           */
908 
909         /* Interface address info. */
910         unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
911         unsigned char           addr_len;       /* hardware address length      */
912         unsigned short          dev_id;         /* for shared network cards */
913 
914         spinlock_t              addr_list_lock;
915         struct netdev_hw_addr_list      uc;     /* Unicast mac addresses */
916         struct netdev_hw_addr_list      mc;     /* Multicast mac addresses */
917         int                     uc_promisc;
918         unsigned int            promiscuity;
919         unsigned int            allmulti;
920 
921 
922         /* Protocol specific pointers */
923         
924 #ifdef CONFIG_NET_DSA
925         void                    *dsa_ptr;       /* dsa specific data */
926 #endif
927         void                    *atalk_ptr;     /* AppleTalk link       */
928         void                    *ip_ptr;        /* IPv4 specific data   */
929         void                    *dn_ptr;        /* DECnet specific data */
930         void                    *ip6_ptr;       /* IPv6 specific data */
931         void                    *ec_ptr;        /* Econet specific data */
932         void                    *ax25_ptr;      /* AX.25 specific data */
933         struct wireless_dev     *ieee80211_ptr; /* IEEE 802.11 specific data,
934                                                    assign before registering */
935 
936 /*
937  * Cache line mostly used on receive path (including eth_type_trans())
938  */
939         unsigned long           last_rx;        /* Time of last Rx      */
940         /* Interface address info used in eth_type_trans() */
941         unsigned char           *dev_addr;      /* hw address, (before bcast
942                                                    because most packets are
943                                                    unicast) */
944 
945         struct netdev_hw_addr_list      dev_addrs; /* list of device
946                                                       hw addresses */
947 
948         unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
949 
950 #ifdef CONFIG_RPS
951         struct kset             *queues_kset;
952 
953         struct netdev_rx_queue  *_rx;
954 
955         /* Number of RX queues allocated at alloc_netdev_mq() time  */
956         unsigned int            num_rx_queues;
957 #endif
958 
959         struct netdev_queue     rx_queue;
960 
961         struct netdev_queue     *_tx ____cacheline_aligned_in_smp;
962 
963         /* Number of TX queues allocated at alloc_netdev_mq() time  */
964         unsigned int            num_tx_queues;
965 
966         /* Number of TX queues currently active in device  */
967         unsigned int            real_num_tx_queues;
968 
969         /* root qdisc from userspace point of view */
970         struct Qdisc            *qdisc;
971 
972         unsigned long           tx_queue_len;   /* Max frames per queue allowed */
973         spinlock_t              tx_global_lock;
974 /*
975  * One part is mostly used on xmit path (device)
976  */
977         /* These may be needed for future network-power-down code. */
978 
979         /*
980          * trans_start here is expensive for high speed devices on SMP,
981          * please use netdev_queue->trans_start instead.
982          */
983         unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
984 
985         int                     watchdog_timeo; /* used by dev_watchdog() */
986         struct timer_list       watchdog_timer;
987 
988         /* Number of references to this device */
989         atomic_t                refcnt ____cacheline_aligned_in_smp;
990 
991         /* delayed register/unregister */
992         struct list_head        todo_list;
993         /* device index hash chain */
994         struct hlist_node       index_hlist;
995 
996         struct list_head        link_watch_list;
997 
998         /* register/unregister state machine */
999         enum { NETREG_UNINITIALIZED=0,
1000                NETREG_REGISTERED,       /* completed register_netdevice */
1001                NETREG_UNREGISTERING,    /* called unregister_netdevice */
1002                NETREG_UNREGISTERED,     /* completed unregister todo */
1003                NETREG_RELEASED,         /* called free_netdev */
1004                NETREG_DUMMY,            /* dummy device for NAPI poll */
1005         } reg_state:16;
1006 
1007         enum {
1008                 RTNL_LINK_INITIALIZED,
1009                 RTNL_LINK_INITIALIZING,
1010         } rtnl_link_state:16;
1011 
1012         /* Called from unregister, can be used to call free_netdev */
1013         void (*destructor)(struct net_device *dev);
1014 
1015 #ifdef CONFIG_NETPOLL
1016         struct netpoll_info     *npinfo;
1017 #endif
1018 
1019 #ifdef CONFIG_NET_NS
1020         /* Network namespace this network device is inside */
1021         struct net              *nd_net;
1022 #endif
1023 
1024         /* mid-layer private */
1025         void                    *ml_priv;
1026 
1027         /* bridge stuff */
1028         struct net_bridge_port  *br_port;
1029         /* macvlan */
1030         struct macvlan_port     *macvlan_port;
1031         /* GARP */
1032         struct garp_port        *garp_port;
1033 
1034         /* class/net/name entry */
1035         struct device           dev;
1036         /* space for optional device, statistics, and wireless sysfs groups */
1037         const struct attribute_group *sysfs_groups[4];
1038 
1039         /* rtnetlink link ops */
1040         const struct rtnl_link_ops *rtnl_link_ops;
1041 
1042         /* VLAN feature mask */
1043         unsigned long vlan_features;
1044 
1045         /* for setting kernel sock attribute on TCP connection setup */
1046 #define GSO_MAX_SIZE            65536
1047         unsigned int            gso_max_size;
1048 
1049 #ifdef CONFIG_DCB
1050         /* Data Center Bridging netlink ops */
1051         const struct dcbnl_rtnl_ops *dcbnl_ops;
1052 #endif
1053 
1054 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
1055         /* max exchange id for FCoE LRO by ddp */
1056         unsigned int            fcoe_ddp_xid;
1057 #endif
1058         /* n-tuple filter list attached to this device */
1059         struct ethtool_rx_ntuple_list ethtool_ntuple_list;
1060 };
1061 #define to_net_dev(d) container_of(d, struct net_device, dev)
1062 
1063 #define NETDEV_ALIGN            32
1064 
1065 static inline
1066 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
1067                                          unsigned int index)
1068 {
1069         return &dev->_tx[index];
1070 }
1071 
1072 static inline void netdev_for_each_tx_queue(struct net_device *dev,
1073                                             void (*f)(struct net_device *,
1074                                                       struct netdev_queue *,
1075                                                       void *),
1076                                             void *arg)
1077 {
1078         unsigned int i;
1079 
1080         for (i = 0; i < dev->num_tx_queues; i++)
1081                 f(dev, &dev->_tx[i], arg);
1082 }
1083 
1084 /*
1085  * Net namespace inlines
1086  */
1087 static inline
1088 struct net *dev_net(const struct net_device *dev)
1089 {
1090 #ifdef CONFIG_NET_NS
1091         return dev->nd_net;
1092 #else
1093         return &init_net;
1094 #endif
1095 }
1096 
1097 static inline
1098 void dev_net_set(struct net_device *dev, struct net *net)
1099 {
1100 #ifdef CONFIG_NET_NS
1101         release_net(dev->nd_net);
1102         dev->nd_net = hold_net(net);
1103 #endif
1104 }
1105 
1106 static inline bool netdev_uses_dsa_tags(struct net_device *dev)
1107 {
1108 #ifdef CONFIG_NET_DSA_TAG_DSA
1109         if (dev->dsa_ptr != NULL)
1110                 return dsa_uses_dsa_tags(dev->dsa_ptr);
1111 #endif
1112 
1113         return 0;
1114 }
1115 
1116 #ifndef CONFIG_NET_NS
1117 static inline void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1118 {
1119         skb->dev = dev;
1120 }
1121 #else /* CONFIG_NET_NS */
1122 void skb_set_dev(struct sk_buff *skb, struct net_device *dev);
1123 #endif
1124 
1125 static inline bool netdev_uses_trailer_tags(struct net_device *dev)
1126 {
1127 #ifdef CONFIG_NET_DSA_TAG_TRAILER
1128         if (dev->dsa_ptr != NULL)
1129                 return dsa_uses_trailer_tags(dev->dsa_ptr);
1130 #endif
1131 
1132         return 0;
1133 }
1134 
1135 /**
1136  *      netdev_priv - access network device private data
1137  *      @dev: network device
1138  *
1139  * Get network device private data
1140  */
1141 static inline void *netdev_priv(const struct net_device *dev)
1142 {
1143         return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
1144 }
1145 
1146 /* Set the sysfs physical device reference for the network logical device
1147  * if set prior to registration will cause a symlink during initialization.
1148  */
1149 #define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))
1150 
1151 /* Set the sysfs device type for the network logical device to allow
1152  * fin grained indentification of different network device types. For
1153  * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
1154  */
1155 #define SET_NETDEV_DEVTYPE(net, devtype)        ((net)->dev.type = (devtype))
1156 
1157 /**
1158  *      netif_napi_add - initialize a napi context
1159  *      @dev:  network device
1160  *      @napi: napi context
1161  *      @poll: polling function
1162  *      @weight: default weight
1163  *
1164  * netif_napi_add() must be used to initialize a napi context prior to calling
1165  * *any* of the other napi related functions.
1166  */
1167 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
1168                     int (*poll)(struct napi_struct *, int), int weight);
1169 
1170 /**
1171  *  netif_napi_del - remove a napi context
1172  *  @napi: napi context
1173  *
1174  *  netif_napi_del() removes a napi context from the network device napi list
1175  */
1176 void netif_napi_del(struct napi_struct *napi);
1177 
1178 struct napi_gro_cb {
1179         /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
1180         void *frag0;
1181 
1182         /* Length of frag0. */
1183         unsigned int frag0_len;
1184 
1185         /* This indicates where we are processing relative to skb->data. */
1186         int data_offset;
1187 
1188         /* This is non-zero if the packet may be of the same flow. */
1189         int same_flow;
1190 
1191         /* This is non-zero if the packet cannot be merged with the new skb. */
1192         int flush;
1193 
1194         /* Number of segments aggregated. */
1195         int count;
1196 
1197         /* Free the skb? */
1198         int free;
1199 };
1200 
1201 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1202 
1203 struct packet_type {
1204         __be16                  type;   /* This is really htons(ether_type). */
1205         struct net_device       *dev;   /* NULL is wildcarded here           */
1206         int                     (*func) (struct sk_buff *,
1207                                          struct net_device *,
1208                                          struct packet_type *,
1209                                          struct net_device *);
1210         struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
1211                                                 int features);
1212         int                     (*gso_send_check)(struct sk_buff *skb);
1213         struct sk_buff          **(*gro_receive)(struct sk_buff **head,
1214                                                struct sk_buff *skb);
1215         int                     (*gro_complete)(struct sk_buff *skb);
1216         void                    *af_packet_priv;
1217         struct list_head        list;
1218 };
1219 
1220 #include <linux/interrupt.h>
1221 #include <linux/notifier.h>
1222 
1223 extern rwlock_t                         dev_base_lock;          /* Device list lock */
1224 
1225 
1226 #define for_each_netdev(net, d)         \
1227                 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1228 #define for_each_netdev_reverse(net, d) \
1229                 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1230 #define for_each_netdev_rcu(net, d)             \
1231                 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1232 #define for_each_netdev_safe(net, d, n) \
1233                 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
1234 #define for_each_netdev_continue(net, d)                \
1235                 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
1236 #define for_each_netdev_continue_rcu(net, d)            \
1237         list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1238 #define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)
1239 
1240 static inline struct net_device *next_net_device(struct net_device *dev)
1241 {
1242         struct list_head *lh;
1243         struct net *net;
1244 
1245         net = dev_net(dev);
1246         lh = dev->dev_list.next;
1247         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1248 }
1249 
1250 static inline struct net_device *next_net_device_rcu(struct net_device *dev)
1251 {
1252         struct list_head *lh;
1253         struct net *net;
1254 
1255         net = dev_net(dev);
1256         lh = rcu_dereference(dev->dev_list.next);
1257         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1258 }
1259 
1260 static inline struct net_device *first_net_device(struct net *net)
1261 {
1262         return list_empty(&net->dev_base_head) ? NULL :
1263                 net_device_entry(net->dev_base_head.next);
1264 }
1265 
1266 extern int                      netdev_boot_setup_check(struct net_device *dev);
1267 extern unsigned long            netdev_boot_base(const char *prefix, int unit);
1268 extern struct net_device    *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
1269 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
1270 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
1271 extern void             dev_add_pack(struct packet_type *pt);
1272 extern void             dev_remove_pack(struct packet_type *pt);
1273 extern void             __dev_remove_pack(struct packet_type *pt);
1274 
1275 extern struct net_device        *dev_get_by_flags(struct net *net, unsigned short flags,
1276                                                   unsigned short mask);
1277 extern struct net_device        *dev_get_by_name(struct net *net, const char *name);
1278 extern struct net_device        *dev_get_by_name_rcu(struct net *net, const char *name);
1279 extern struct net_device        *__dev_get_by_name(struct net *net, const char *name);
1280 extern int              dev_alloc_name(struct net_device *dev, const char *name);
1281 extern int              dev_open(struct net_device *dev);
1282 extern int              dev_close(struct net_device *dev);
1283 extern void             dev_disable_lro(struct net_device *dev);
1284 extern int              dev_queue_xmit(struct sk_buff *skb);
1285 extern int              register_netdevice(struct net_device *dev);
1286 extern void             unregister_netdevice_queue(struct net_device *dev,
1287                                                    struct list_head *head);
1288 extern void             unregister_netdevice_many(struct list_head *head);
1289 static inline void unregister_netdevice(struct net_device *dev)
1290 {
1291         unregister_netdevice_queue(dev, NULL);
1292 }
1293 
1294 extern void             free_netdev(struct net_device *dev);
1295 extern void             synchronize_net(void);
1296 extern int              register_netdevice_notifier(struct notifier_block *nb);
1297 extern int              unregister_netdevice_notifier(struct notifier_block *nb);
1298 extern int              init_dummy_netdev(struct net_device *dev);
1299 extern void             netdev_resync_ops(struct net_device *dev);
1300 
1301 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1302 extern struct net_device        *dev_get_by_index(struct net *net, int ifindex);
1303 extern struct net_device        *__dev_get_by_index(struct net *net, int ifindex);
1304 extern struct net_device        *dev_get_by_index_rcu(struct net *net, int ifindex);
1305 extern int              dev_restart(struct net_device *dev);
1306 #ifdef CONFIG_NETPOLL_TRAP
1307 extern int              netpoll_trap(void);
1308 #endif
1309 extern int             skb_gro_receive(struct sk_buff **head,
1310                                        struct sk_buff *skb);
1311 extern void            skb_gro_reset_offset(struct sk_buff *skb);
1312 
1313 static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
1314 {
1315         return NAPI_GRO_CB(skb)->data_offset;
1316 }
1317 
1318 static inline unsigned int skb_gro_len(const struct sk_buff *skb)
1319 {
1320         return skb->len - NAPI_GRO_CB(skb)->data_offset;
1321 }
1322 
1323 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
1324 {
1325         NAPI_GRO_CB(skb)->data_offset += len;
1326 }
1327 
1328 static inline void *skb_gro_header_fast(struct sk_buff *skb,
1329                                         unsigned int offset)
1330 {
1331         return NAPI_GRO_CB(skb)->frag0 + offset;
1332 }
1333 
1334 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
1335 {
1336         return NAPI_GRO_CB(skb)->frag0_len < hlen;
1337 }
1338 
1339 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
1340                                         unsigned int offset)
1341 {
1342         NAPI_GRO_CB(skb)->frag0 = NULL;
1343         NAPI_GRO_CB(skb)->frag0_len = 0;
1344         return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
1345 }
1346 
1347 static inline void *skb_gro_mac_header(struct sk_buff *skb)
1348 {
1349         return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1350 }
1351 
1352 static inline void *skb_gro_network_header(struct sk_buff *skb)
1353 {
1354         return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
1355                skb_network_offset(skb);
1356 }
1357 
1358 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
1359                                   unsigned short type,
1360                                   const void *daddr, const void *saddr,
1361                                   unsigned len)
1362 {
1363         if (!dev->header_ops || !dev->header_ops->create)
1364                 return 0;
1365 
1366         return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1367 }
1368 
1369 static inline int dev_parse_header(const struct sk_buff *skb,
1370                                    unsigned char *haddr)
1371 {
1372         const struct net_device *dev = skb->dev;
1373 
1374         if (!dev->header_ops || !dev->header_ops->parse)
1375                 return 0;
1376         return dev->header_ops->parse(skb, haddr);
1377 }
1378 
1379 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1380 extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
1381 static inline int unregister_gifconf(unsigned int family)
1382 {
1383         return register_gifconf(family, NULL);
1384 }
1385 
1386 /*
1387  * Incoming packets are placed on per-cpu queues
1388  */
1389 struct softnet_data {
1390         struct Qdisc            *output_queue;
1391         struct Qdisc            **output_queue_tailp;
1392         struct list_head        poll_list;
1393         struct sk_buff          *completion_queue;
1394         struct sk_buff_head     process_queue;
1395 
1396         /* stats */
1397         unsigned int            processed;
1398         unsigned int            time_squeeze;
1399         unsigned int            cpu_collision;
1400         unsigned int            received_rps;
1401 
1402 #ifdef CONFIG_RPS
1403         struct softnet_data     *rps_ipi_list;
1404 
1405         /* Elements below can be accessed between CPUs for RPS */
1406         struct call_single_data csd ____cacheline_aligned_in_smp;
1407         struct softnet_data     *rps_ipi_next;
1408         unsigned int            cpu;
1409         unsigned int            input_queue_head;
1410         unsigned int            input_queue_tail;
1411 #endif
1412         unsigned                dropped;
1413         struct sk_buff_head     input_pkt_queue;
1414         struct napi_struct      backlog;
1415 };
1416 
1417 static inline void input_queue_head_incr(struct softnet_data *sd)
1418 {
1419 #ifdef CONFIG_RPS
1420         sd->input_queue_head++;
1421 #endif
1422 }
1423 
1424 static inline void input_queue_tail_incr_save(struct softnet_data *sd,
1425                                               unsigned int *qtail)
1426 {
1427 #ifdef CONFIG_RPS
1428         *qtail = ++sd->input_queue_tail;
1429 #endif
1430 }
1431 
1432 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
1433 
1434 #define HAVE_NETIF_QUEUE
1435 
1436 extern void __netif_schedule(struct Qdisc *q);
1437 
1438 static inline void netif_schedule_queue(struct netdev_queue *txq)
1439 {
1440         if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1441                 __netif_schedule(txq->qdisc);
1442 }
1443 
1444 static inline void netif_tx_schedule_all(struct net_device *dev)
1445 {
1446         unsigned int i;
1447 
1448         for (i = 0; i < dev->num_tx_queues; i++)
1449                 netif_schedule_queue(netdev_get_tx_queue(dev, i));
1450 }
1451 
1452 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
1453 {
1454         clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1455 }
1456 
1457 /**
1458  *      netif_start_queue - allow transmit
1459  *      @dev: network device
1460  *
1461  *      Allow upper layers to call the device hard_start_xmit routine.
1462  */
1463 static inline void netif_start_queue(struct net_device *dev)
1464 {
1465         netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
1466 }
1467 
1468 static inline void netif_tx_start_all_queues(struct net_device *dev)
1469 {
1470         unsigned int i;
1471 
1472         for (i = 0; i < dev->num_tx_queues; i++) {
1473                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1474                 netif_tx_start_queue(txq);
1475         }
1476 }
1477 
1478 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
1479 {
1480 #ifdef CONFIG_NETPOLL_TRAP
1481         if (netpoll_trap()) {
1482                 netif_tx_start_queue(dev_queue);
1483                 return;
1484         }
1485 #endif
1486         if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1487                 __netif_schedule(dev_queue->qdisc);
1488 }
1489 
1490 /**
1491  *      netif_wake_queue - restart transmit
1492  *      @dev: network device
1493  *
1494  *      Allow upper layers to call the device hard_start_xmit routine.
1495  *      Used for flow control when transmit resources are available.
1496  */
1497 static inline void netif_wake_queue(struct net_device *dev)
1498 {
1499         netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
1500 }
1501 
1502 static inline void netif_tx_wake_all_queues(struct net_device *dev)
1503 {
1504         unsigned int i;
1505 
1506         for (i = 0; i < dev->num_tx_queues; i++) {
1507                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1508                 netif_tx_wake_queue(txq);
1509         }
1510 }
1511 
1512 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
1513 {
1514         set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1515 }
1516 
1517 /**
1518  *      netif_stop_queue - stop transmitted packets
1519  *      @dev: network device
1520  *
1521  *      Stop upper layers calling the device hard_start_xmit routine.
1522  *      Used for flow control when transmit resources are unavailable.
1523  */
1524 static inline void netif_stop_queue(struct net_device *dev)
1525 {
1526         netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
1527 }
1528 
1529 static inline void netif_tx_stop_all_queues(struct net_device *dev)
1530 {
1531         unsigned int i;
1532 
1533         for (i = 0; i < dev->num_tx_queues; i++) {
1534                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1535                 netif_tx_stop_queue(txq);
1536         }
1537 }
1538 
1539 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1540 {
1541         return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1542 }
1543 
1544 /**
1545  *      netif_queue_stopped - test if transmit queue is flowblocked
1546  *      @dev: network device
1547  *
1548  *      Test if transmit queue on device is currently unable to send.
1549  */
1550 static inline int netif_queue_stopped(const struct net_device *dev)
1551 {
1552         return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
1553 }
1554 
1555 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue)
1556 {
1557         return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state);
1558 }
1559 
1560 /**
1561  *      netif_running - test if up
1562  *      @dev: network device
1563  *
1564  *      Test if the device has been brought up.
1565  */
1566 static inline int netif_running(const struct net_device *dev)
1567 {
1568         return test_bit(__LINK_STATE_START, &dev->state);
1569 }
1570 
1571 /*
1572  * Routines to manage the subqueues on a device.  We only need start
1573  * stop, and a check if it's stopped.  All other device management is
1574  * done at the overall netdevice level.
1575  * Also test the device if we're multiqueue.
1576  */
1577 
1578 /**
1579  *      netif_start_subqueue - allow sending packets on subqueue
1580  *      @dev: network device
1581  *      @queue_index: sub queue index
1582  *
1583  * Start individual transmit queue of a device with multiple transmit queues.
1584  */
1585 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
1586 {
1587         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1588 
1589         netif_tx_start_queue(txq);
1590 }
1591 
1592 /**
1593  *      netif_stop_subqueue - stop sending packets on subqueue
1594  *      @dev: network device
1595  *      @queue_index: sub queue index
1596  *
1597  * Stop individual transmit queue of a device with multiple transmit queues.
1598  */
1599 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
1600 {
1601         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1602 #ifdef CONFIG_NETPOLL_TRAP
1603         if (netpoll_trap())
1604                 return;
1605 #endif
1606         netif_tx_stop_queue(txq);
1607 }
1608 
1609 /**
1610  *      netif_subqueue_stopped - test status of subqueue
1611  *      @dev: network device
1612  *      @queue_index: sub queue index
1613  *
1614  * Check individual transmit queue of a device with multiple transmit queues.
1615  */
1616 static inline int __netif_subqueue_stopped(const struct net_device *dev,
1617                                          u16 queue_index)
1618 {
1619         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1620 
1621         return netif_tx_queue_stopped(txq);
1622 }
1623 
1624 static inline int netif_subqueue_stopped(const struct net_device *dev,
1625                                          struct sk_buff *skb)
1626 {
1627         return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
1628 }
1629 
1630 /**
1631  *      netif_wake_subqueue - allow sending packets on subqueue
1632  *      @dev: network device
1633  *      @queue_index: sub queue index
1634  *
1635  * Resume individual transmit queue of a device with multiple transmit queues.
1636  */
1637 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
1638 {
1639         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1640 #ifdef CONFIG_NETPOLL_TRAP
1641         if (netpoll_trap())
1642                 return;
1643 #endif
1644         if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1645                 __netif_schedule(txq->qdisc);
1646 }
1647 
1648 /**
1649  *      netif_is_multiqueue - test if device has multiple transmit queues
1650  *      @dev: network device
1651  *
1652  * Check if device has multiple transmit queues
1653  */
1654 static inline int netif_is_multiqueue(const struct net_device *dev)
1655 {
1656         return (dev->num_tx_queues > 1);
1657 }
1658 
1659 extern void netif_set_real_num_tx_queues(struct net_device *dev,
1660                                          unsigned int txq);
1661 
1662 /* Use this variant when it is known for sure that it
1663  * is executing from hardware interrupt context or with hardware interrupts
1664  * disabled.
1665  */
1666 extern void dev_kfree_skb_irq(struct sk_buff *skb);
1667 
1668 /* Use this variant in places where it could be invoked
1669  * from either hardware interrupt or other context, with hardware interrupts
1670  * either disabled or enabled.
1671  */
1672 extern void dev_kfree_skb_any(struct sk_buff *skb);
1673 
1674 #define HAVE_NETIF_RX 1
1675 extern int              netif_rx(struct sk_buff *skb);
1676 extern int              netif_rx_ni(struct sk_buff *skb);
1677 #define HAVE_NETIF_RECEIVE_SKB 1
1678 extern int              netif_receive_skb(struct sk_buff *skb);
1679 extern gro_result_t     dev_gro_receive(struct napi_struct *napi,
1680                                         struct sk_buff *skb);
1681 extern gro_result_t     napi_skb_finish(gro_result_t ret, struct sk_buff *skb);
1682 extern gro_result_t     napi_gro_receive(struct napi_struct *napi,
1683                                          struct sk_buff *skb);
1684 extern void             napi_reuse_skb(struct napi_struct *napi,
1685                                        struct sk_buff *skb);
1686 extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
1687 extern gro_result_t     napi_frags_finish(struct napi_struct *napi,
1688                                           struct sk_buff *skb,
1689                                           gro_result_t ret);
1690 extern struct sk_buff * napi_frags_skb(struct napi_struct *napi);
1691 extern gro_result_t     napi_gro_frags(struct napi_struct *napi);
1692 
1693 static inline void napi_free_frags(struct napi_struct *napi)
1694 {
1695         kfree_skb(napi->skb);
1696         napi->skb = NULL;
1697 }
1698 
1699 extern void             netif_nit_deliver(struct sk_buff *skb);
1700 extern int              dev_valid_name(const char *name);
1701 extern int              dev_ioctl(struct net *net, unsigned int cmd, void __user *);
1702 extern int              dev_ethtool(struct net *net, struct ifreq *);
1703 extern unsigned         dev_get_flags(const struct net_device *);
1704 extern int              __dev_change_flags(struct net_device *, unsigned int flags);
1705 extern int              dev_change_flags(struct net_device *, unsigned);
1706 extern void             __dev_notify_flags(struct net_device *, unsigned int old_flags);
1707 extern int              dev_change_name(struct net_device *, const char *);
1708 extern int              dev_set_alias(struct net_device *, const char *, size_t);
1709 extern int              dev_change_net_namespace(struct net_device *,
1710                                                  struct net *, const char *);
1711 extern int              dev_set_mtu(struct net_device *, int);
1712 extern int              dev_set_mac_address(struct net_device *,
1713                                             struct sockaddr *);
1714 extern int              dev_hard_start_xmit(struct sk_buff *skb,
1715                                             struct net_device *dev,
1716                                             struct netdev_queue *txq);
1717 extern int              dev_forward_skb(struct net_device *dev,
1718                                         struct sk_buff *skb);
1719 
1720 extern int              netdev_budget;
1721 
1722 /* Called by rtnetlink.c:rtnl_unlock() */
1723 extern void netdev_run_todo(void);
1724 
1725 /**
1726  *      dev_put - release reference to device
1727  *      @dev: network device
1728  *
1729  * Release reference to device to allow it to be freed.
1730  */
1731 static inline void dev_put(struct net_device *dev)
1732 {
1733         atomic_dec(&dev->refcnt);
1734 }
1735 
1736 /**
1737  *      dev_hold - get reference to device
1738  *      @dev: network device
1739  *
1740  * Hold reference to device to keep it from being freed.
1741  */
1742 static inline void dev_hold(struct net_device *dev)
1743 {
1744         atomic_inc(&dev->refcnt);
1745 }
1746 
1747 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
1748  * and _off may be called from IRQ context, but it is caller
1749  * who is responsible for serialization of these calls.
1750  *
1751  * The name carrier is inappropriate, these functions should really be
1752  * called netif_lowerlayer_*() because they represent the state of any
1753  * kind of lower layer not just hardware media.
1754  */
1755 
1756 extern void linkwatch_fire_event(struct net_device *dev);
1757 extern void linkwatch_forget_dev(struct net_device *dev);
1758 
1759 /**
1760  *      netif_carrier_ok - test if carrier present
1761  *      @dev: network device
1762  *
1763  * Check if carrier is present on device
1764  */
1765 static inline int netif_carrier_ok(const struct net_device *dev)
1766 {
1767         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
1768 }
1769 
1770 extern unsigned long dev_trans_start(struct net_device *dev);
1771 
1772 extern void __netdev_watchdog_up(struct net_device *dev);
1773 
1774 extern void netif_carrier_on(struct net_device *dev);
1775 
1776 extern void netif_carrier_off(struct net_device *dev);
1777 
1778 extern void netif_notify_peers(struct net_device *dev);
1779 
1780 /**
1781  *      netif_dormant_on - mark device as dormant.
1782  *      @dev: network device
1783  *
1784  * Mark device as dormant (as per RFC2863).
1785  *
1786  * The dormant state indicates that the relevant interface is not
1787  * actually in a condition to pass packets (i.e., it is not 'up') but is
1788  * in a "pending" state, waiting for some external event.  For "on-
1789  * demand" interfaces, this new state identifies the situation where the
1790  * interface is waiting for events to place it in the up state.
1791  *
1792  */
1793 static inline void netif_dormant_on(struct net_device *dev)
1794 {
1795         if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
1796                 linkwatch_fire_event(dev);
1797 }
1798 
1799 /**
1800  *      netif_dormant_off - set device as not dormant.
1801  *      @dev: network device
1802  *
1803  * Device is not in dormant state.
1804  */
1805 static inline void netif_dormant_off(struct net_device *dev)
1806 {
1807         if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
1808                 linkwatch_fire_event(dev);
1809 }
1810 
1811 /**
1812  *      netif_dormant - test if carrier present
1813  *      @dev: network device
1814  *
1815  * Check if carrier is present on device
1816  */
1817 static inline int netif_dormant(const struct net_device *dev)
1818 {
1819         return test_bit(__LINK_STATE_DORMANT, &dev->state);
1820 }
1821 
1822 
1823 /**
1824  *      netif_oper_up - test if device is operational
1825  *      @dev: network device
1826  *
1827  * Check if carrier is operational
1828  */
1829 static inline int netif_oper_up(const struct net_device *dev)
1830 {
1831         return (dev->operstate == IF_OPER_UP ||
1832                 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
1833 }
1834 
1835 /**
1836  *      netif_device_present - is device available or removed
1837  *      @dev: network device
1838  *
1839  * Check if device has not been removed from system.
1840  */
1841 static inline int netif_device_present(struct net_device *dev)
1842 {
1843         return test_bit(__LINK_STATE_PRESENT, &dev->state);
1844 }
1845 
1846 extern void netif_device_detach(struct net_device *dev);
1847 
1848 extern void netif_device_attach(struct net_device *dev);
1849 
1850 /*
1851  * Network interface message level settings
1852  */
1853 #define HAVE_NETIF_MSG 1
1854 
1855 enum {
1856         NETIF_MSG_DRV           = 0x0001,
1857         NETIF_MSG_PROBE         = 0x0002,
1858         NETIF_MSG_LINK          = 0x0004,
1859         NETIF_MSG_TIMER         = 0x0008,
1860         NETIF_MSG_IFDOWN        = 0x0010,
1861         NETIF_MSG_IFUP          = 0x0020,
1862         NETIF_MSG_RX_ERR        = 0x0040,
1863         NETIF_MSG_TX_ERR        = 0x0080,
1864         NETIF_MSG_TX_QUEUED     = 0x0100,
1865         NETIF_MSG_INTR          = 0x0200,
1866         NETIF_MSG_TX_DONE       = 0x0400,
1867         NETIF_MSG_RX_STATUS     = 0x0800,
1868         NETIF_MSG_PKTDATA       = 0x1000,
1869         NETIF_MSG_HW            = 0x2000,
1870         NETIF_MSG_WOL           = 0x4000,
1871 };
1872 
1873 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
1874 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
1875 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
1876 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
1877 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
1878 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
1879 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
1880 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
1881 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
1882 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
1883 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
1884 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
1885 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
1886 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
1887 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
1888 
1889 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
1890 {
1891         /* use default */
1892         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
1893                 return default_msg_enable_bits;
1894         if (debug_value == 0)   /* no output */
1895                 return 0;
1896         /* set low N bits */
1897         return (1 << debug_value) - 1;
1898 }
1899 
1900 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
1901 {
1902         spin_lock(&txq->_xmit_lock);
1903         txq->xmit_lock_owner = cpu;
1904 }
1905 
1906 static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
1907 {
1908         spin_lock_bh(&txq->_xmit_lock);
1909         txq->xmit_lock_owner = smp_processor_id();
1910 }
1911 
1912 static inline int __netif_tx_trylock(struct netdev_queue *txq)
1913 {
1914         int ok = spin_trylock(&txq->_xmit_lock);
1915         if (likely(ok))
1916                 txq->xmit_lock_owner = smp_processor_id();
1917         return ok;
1918 }
1919 
1920 static inline void __netif_tx_unlock(struct netdev_queue *txq)
1921 {
1922         txq->xmit_lock_owner = -1;
1923         spin_unlock(&txq->_xmit_lock);
1924 }
1925 
1926 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
1927 {
1928         txq->xmit_lock_owner = -1;
1929         spin_unlock_bh(&txq->_xmit_lock);
1930 }
1931 
1932 static inline void txq_trans_update(struct netdev_queue *txq)
1933 {
1934         if (txq->xmit_lock_owner != -1)
1935                 txq->trans_start = jiffies;
1936 }
1937 
1938 /**
1939  *      netif_tx_lock - grab network device transmit lock
1940  *      @dev: network device
1941  *
1942  * Get network device transmit lock
1943  */
1944 static inline void netif_tx_lock(struct net_device *dev)
1945 {
1946         unsigned int i;
1947         int cpu;
1948 
1949         spin_lock(&dev->tx_global_lock);
1950         cpu = smp_processor_id();
1951         for (i = 0; i < dev->num_tx_queues; i++) {
1952                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1953 
1954                 /* We are the only thread of execution doing a
1955                  * freeze, but we have to grab the _xmit_lock in
1956                  * order to synchronize with threads which are in
1957                  * the ->hard_start_xmit() handler and already
1958                  * checked the frozen bit.
1959                  */
1960                 __netif_tx_lock(txq, cpu);
1961                 set_bit(__QUEUE_STATE_FROZEN, &txq->state);
1962                 __netif_tx_unlock(txq);
1963         }
1964 }
1965 
1966 static inline void netif_tx_lock_bh(struct net_device *dev)
1967 {
1968         local_bh_disable();
1969         netif_tx_lock(dev);
1970 }
1971 
1972 static inline void netif_tx_unlock(struct net_device *dev)
1973 {
1974         unsigned int i;
1975 
1976         for (i = 0; i < dev->num_tx_queues; i++) {
1977                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1978 
1979                 /* No need to grab the _xmit_lock here.  If the
1980                  * queue is not stopped for another reason, we
1981                  * force a schedule.
1982                  */
1983                 clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
1984                 netif_schedule_queue(txq);
1985         }
1986         spin_unlock(&dev->tx_global_lock);
1987 }
1988 
1989 static inline void netif_tx_unlock_bh(struct net_device *dev)
1990 {
1991         netif_tx_unlock(dev);
1992         local_bh_enable();
1993 }
1994 
1995 #define HARD_TX_LOCK(dev, txq, cpu) {                   \
1996         if ((dev->features & NETIF_F_LLTX) == 0) {      \
1997                 __netif_tx_lock(txq, cpu);              \
1998         }                                               \
1999 }
2000 
2001 #define HARD_TX_UNLOCK(dev, txq) {                      \
2002         if ((dev->features & NETIF_F_LLTX) == 0) {      \
2003                 __netif_tx_unlock(txq);                 \
2004         }                                               \
2005 }
2006 
2007 static inline void netif_tx_disable(struct net_device *dev)
2008 {
2009         unsigned int i;
2010         int cpu;
2011 
2012         local_bh_disable();
2013         cpu = smp_processor_id();
2014         for (i = 0; i < dev->num_tx_queues; i++) {
2015                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2016 
2017                 __netif_tx_lock(txq, cpu);
2018                 netif_tx_stop_queue(txq);
2019                 __netif_tx_unlock(txq);
2020         }
2021         local_bh_enable();
2022 }
2023 
2024 static inline void netif_addr_lock(struct net_device *dev)
2025 {
2026         spin_lock(&dev->addr_list_lock);
2027 }
2028 
2029 static inline void netif_addr_lock_bh(struct net_device *dev)
2030 {
2031         spin_lock_bh(&dev->addr_list_lock);
2032 }
2033 
2034 static inline void netif_addr_unlock(struct net_device *dev)
2035 {
2036         spin_unlock(&dev->addr_list_lock);
2037 }
2038 
2039 static inline void netif_addr_unlock_bh(struct net_device *dev)
2040 {
2041         spin_unlock_bh(&dev->addr_list_lock);
2042 }
2043 
2044 /*
2045  * dev_addrs walker. Should be used only for read access. Call with
2046  * rcu_read_lock held.
2047  */
2048 #define for_each_dev_addr(dev, ha) \
2049                 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2050 
2051 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
2052 
2053 extern void             ether_setup(struct net_device *dev);
2054 
2055 /* Support for loadable net-drivers */
2056 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
2057                                        void (*setup)(struct net_device *),
2058                                        unsigned int queue_count);
2059 #define alloc_netdev(sizeof_priv, name, setup) \
2060         alloc_netdev_mq(sizeof_priv, name, setup, 1)
2061 extern int              register_netdev(struct net_device *dev);
2062 extern void             unregister_netdev(struct net_device *dev);
2063 
2064 /* General hardware address lists handling functions */
2065 extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
2066                                   struct netdev_hw_addr_list *from_list,
2067                                   int addr_len, unsigned char addr_type);
2068 extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
2069                                    struct netdev_hw_addr_list *from_list,
2070                                    int addr_len, unsigned char addr_type);
2071 extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
2072                           struct netdev_hw_addr_list *from_list,
2073                           int addr_len);
2074 extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
2075                              struct netdev_hw_addr_list *from_list,
2076                              int addr_len);
2077 extern void __hw_addr_flush(struct netdev_hw_addr_list *list);
2078 extern void __hw_addr_init(struct netdev_hw_addr_list *list);
2079 
2080 /* Functions used for device addresses handling */
2081 extern int dev_addr_add(struct net_device *dev, unsigned char *addr,
2082                         unsigned char addr_type);
2083 extern int dev_addr_del(struct net_device *dev, unsigned char *addr,
2084                         unsigned char addr_type);
2085 extern int dev_addr_add_multiple(struct net_device *to_dev,
2086                                  struct net_device *from_dev,
2087                                  unsigned char addr_type);
2088 extern int dev_addr_del_multiple(struct net_device *to_dev,
2089                                  struct net_device *from_dev,
2090                                  unsigned char addr_type);
2091 extern void dev_addr_flush(struct net_device *dev);
2092 extern int dev_addr_init(struct net_device *dev);
2093 
2094 /* Functions used for unicast addresses handling */
2095 extern int dev_uc_add(struct net_device *dev, unsigned char *addr);
2096 extern int dev_uc_del(struct net_device *dev, unsigned char *addr);
2097 extern int dev_uc_sync(struct net_device *to, struct net_device *from);
2098 extern void dev_uc_unsync(struct net_device *to, struct net_device *from);
2099 extern void dev_uc_flush(struct net_device *dev);
2100 extern void dev_uc_init(struct net_device *dev);
2101 
2102 /* Functions used for multicast addresses handling */
2103 extern int dev_mc_add(struct net_device *dev, unsigned char *addr);
2104 extern int dev_mc_add_global(struct net_device *dev, unsigned char *addr);
2105 extern int dev_mc_del(struct net_device *dev, unsigned char *addr);
2106 extern int dev_mc_del_global(struct net_device *dev, unsigned char *addr);
2107 extern int dev_mc_sync(struct net_device *to, struct net_device *from);
2108 extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
2109 extern void dev_mc_flush(struct net_device *dev);
2110 extern void dev_mc_init(struct net_device *dev);
2111 
2112 /* Functions used for secondary unicast and multicast support */
2113 extern void             dev_set_rx_mode(struct net_device *dev);
2114 extern void             __dev_set_rx_mode(struct net_device *dev);
2115 extern int              dev_set_promiscuity(struct net_device *dev, int inc);
2116 extern int              dev_set_allmulti(struct net_device *dev, int inc);
2117 extern void             netdev_state_change(struct net_device *dev);
2118 extern int              netdev_bonding_change(struct net_device *dev,
2119                                               unsigned long event);
2120 extern void             netdev_features_change(struct net_device *dev);
2121 /* Load a device via the kmod */
2122 extern void             dev_load(struct net *net, const char *name);
2123 extern void             dev_mcast_init(void);
2124 extern const struct net_device_stats *dev_get_stats(struct net_device *dev);
2125 extern void             dev_txq_stats_fold(const struct net_device *dev, struct net_device_stats *stats);
2126 
2127 extern int              netdev_max_backlog;
2128 extern int              netdev_tstamp_prequeue;
2129 extern int              weight_p;
2130 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
2131 extern int skb_checksum_help(struct sk_buff *skb);
2132 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
2133 #ifdef CONFIG_BUG
2134 extern void netdev_rx_csum_fault(struct net_device *dev);
2135 #else
2136 static inline void netdev_rx_csum_fault(struct net_device *dev)
2137 {
2138 }
2139 #endif
2140 /* rx skb timestamps */
2141 extern void             net_enable_timestamp(void);
2142 extern void             net_disable_timestamp(void);
2143 
2144 #ifdef CONFIG_PROC_FS
2145 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
2146 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
2147 extern void dev_seq_stop(struct seq_file *seq, void *v);
2148 #endif
2149 
2150 extern int netdev_class_create_file(struct class_attribute *class_attr);
2151 extern void netdev_class_remove_file(struct class_attribute *class_attr);
2152 
2153 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len);
2154 
2155 extern void linkwatch_run_queue(void);
2156 
2157 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
2158                                         unsigned long mask);
2159 unsigned long netdev_fix_features(unsigned long features, const char *name);
2160 
2161 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
2162                                         struct net_device *dev);
2163 
2164 static inline int net_gso_ok(int features, int gso_type)
2165 {
2166         int feature = gso_type << NETIF_F_GSO_SHIFT;
2167         return (features & feature) == feature;
2168 }
2169 
2170 static inline int skb_gso_ok(struct sk_buff *skb, int features)
2171 {
2172         return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2173                (!skb_has_frags(skb) || (features & NETIF_F_FRAGLIST));
2174 }
2175 
2176 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
2177 {
2178         return skb_is_gso(skb) &&
2179                (!skb_gso_ok(skb, dev->features) ||
2180                 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
2181 }
2182 
2183 static inline void netif_set_gso_max_size(struct net_device *dev,
2184                                           unsigned int size)
2185 {
2186         dev->gso_max_size = size;
2187 }
2188 
2189 extern int __skb_bond_should_drop(struct sk_buff *skb,
2190                                   struct net_device *master);
2191 
2192 static inline int skb_bond_should_drop(struct sk_buff *skb,
2193                                        struct net_device *master)
2194 {
2195         if (master)
2196                 return __skb_bond_should_drop(skb, master);
2197         return 0;
2198 }
2199 
2200 extern struct pernet_operations __net_initdata loopback_net_ops;
2201 
2202 static inline int dev_ethtool_get_settings(struct net_device *dev,
2203                                            struct ethtool_cmd *cmd)
2204 {
2205         if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings)
2206                 return -EOPNOTSUPP;
2207         return dev->ethtool_ops->get_settings(dev, cmd);
2208 }
2209 
2210 static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev)
2211 {
2212         if (!dev->ethtool_ops || !dev->ethtool_ops->get_rx_csum)
2213                 return 0;
2214         return dev->ethtool_ops->get_rx_csum(dev);
2215 }
2216 
2217 static inline u32 dev_ethtool_get_flags(struct net_device *dev)
2218 {
2219         if (!dev->ethtool_ops || !dev->ethtool_ops->get_flags)
2220                 return 0;
2221         return dev->ethtool_ops->get_flags(dev);
2222 }
2223 
2224 /* Logging, debugging and troubleshooting/diagnostic helpers. */
2225 
2226 /* netdev_printk helpers, similar to dev_printk */
2227 
2228 static inline const char *netdev_name(const struct net_device *dev)
2229 {
2230         if (dev->reg_state != NETREG_REGISTERED)
2231                 return "(unregistered net_device)";
2232         return dev->name;
2233 }
2234 
2235 #define netdev_printk(level, netdev, format, args...)           \
2236         dev_printk(level, (netdev)->dev.parent,                 \
2237                    "%s: " format,                               \
2238                    netdev_name(netdev), ##args)
2239 
2240 #define netdev_emerg(dev, format, args...)                      \
2241         netdev_printk(KERN_EMERG, dev, format, ##args)
2242 #define netdev_alert(dev, format, args...)                      \
2243         netdev_printk(KERN_ALERT, dev, format, ##args)
2244 #define netdev_crit(dev, format, args...)                       \
2245         netdev_printk(KERN_CRIT, dev, format, ##args)
2246 #define netdev_err(dev, format, args...)                        \
2247         netdev_printk(KERN_ERR, dev, format, ##args)
2248 #define netdev_warn(dev, format, args...)                       \
2249         netdev_printk(KERN_WARNING, dev, format, ##args)
2250 #define netdev_notice(dev, format, args...)                     \
2251         netdev_printk(KERN_NOTICE, dev, format, ##args)
2252 #define netdev_info(dev, format, args...)                       \
2253         netdev_printk(KERN_INFO, dev, format, ##args)
2254 
2255 #if defined(DEBUG)
2256 #define netdev_dbg(__dev, format, args...)                      \
2257         netdev_printk(KERN_DEBUG, __dev, format, ##args)
2258 #elif defined(CONFIG_DYNAMIC_DEBUG)
2259 #define netdev_dbg(__dev, format, args...)                      \
2260 do {                                                            \
2261         dynamic_dev_dbg((__dev)->dev.parent, "%s: " format,     \
2262                         netdev_name(__dev), ##args);            \
2263 } while (0)
2264 #else
2265 #define netdev_dbg(__dev, format, args...)                      \
2266 ({                                                              \
2267         if (0)                                                  \
2268                 netdev_printk(KERN_DEBUG, __dev, format, ##args); \
2269         0;                                                      \
2270 })
2271 #endif
2272 
2273 #if defined(VERBOSE_DEBUG)
2274 #define netdev_vdbg     netdev_dbg
2275 #else
2276 
2277 #define netdev_vdbg(dev, format, args...)                       \
2278 ({                                                              \
2279         if (0)                                                  \
2280                 netdev_printk(KERN_DEBUG, dev, format, ##args); \
2281         0;                                                      \
2282 })
2283 #endif
2284 
2285 /*
2286  * netdev_WARN() acts like dev_printk(), but with the key difference
2287  * of using a WARN/WARN_ON to get the message out, including the
2288  * file/line information and a backtrace.
2289  */
2290 #define netdev_WARN(dev, format, args...)                       \
2291         WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args);
2292 
2293 /* netif printk helpers, similar to netdev_printk */
2294 
2295 #define netif_printk(priv, type, level, dev, fmt, args...)      \
2296 do {                                                            \
2297         if (netif_msg_##type(priv))                             \
2298                 netdev_printk(level, (dev), fmt, ##args);       \
2299 } while (0)
2300 
2301 #define netif_emerg(priv, type, dev, fmt, args...)              \
2302         netif_printk(priv, type, KERN_EMERG, dev, fmt, ##args)
2303 #define netif_alert(priv, type, dev, fmt, args...)              \
2304         netif_printk(priv, type, KERN_ALERT, dev, fmt, ##args)
2305 #define netif_crit(priv, type, dev, fmt, args...)               \
2306         netif_printk(priv, type, KERN_CRIT, dev, fmt, ##args)
2307 #define netif_err(priv, type, dev, fmt, args...)                \
2308         netif_printk(priv, type, KERN_ERR, dev, fmt, ##args)
2309 #define netif_warn(priv, type, dev, fmt, args...)               \
2310         netif_printk(priv, type, KERN_WARNING, dev, fmt, ##args)
2311 #define netif_notice(priv, type, dev, fmt, args...)             \
2312         netif_printk(priv, type, KERN_NOTICE, dev, fmt, ##args)
2313 #define netif_info(priv, type, dev, fmt, args...)               \
2314         netif_printk(priv, type, KERN_INFO, (dev), fmt, ##args)
2315 
2316 #if defined(DEBUG)
2317 #define netif_dbg(priv, type, dev, format, args...)             \
2318         netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
2319 #elif defined(CONFIG_DYNAMIC_DEBUG)
2320 #define netif_dbg(priv, type, netdev, format, args...)          \
2321 do {                                                            \
2322         if (netif_msg_##type(priv))                             \
2323                 dynamic_dev_dbg((netdev)->dev.parent,           \
2324                                 "%s: " format,                  \
2325                                 netdev_name(netdev), ##args);   \
2326 } while (0)
2327 #else
2328 #define netif_dbg(priv, type, dev, format, args...)                     \
2329 ({                                                                      \
2330         if (0)                                                          \
2331                 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2332         0;                                                              \
2333 })
2334 #endif
2335 
2336 #if defined(VERBOSE_DEBUG)
2337 #define netif_vdbg      netif_dbg
2338 #else
2339 #define netif_vdbg(priv, type, dev, format, args...)            \
2340 ({                                                              \
2341         if (0)                                                  \
2342                 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2343         0;                                                      \
2344 })
2345 #endif
2346 
2347 #endif /* __KERNEL__ */
2348 
2349 #endif  /* _LINUX_NETDEVICE_H */
2350 

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