~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.10-rc5 ] ~ [ linux-5.9.10 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.79 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.159 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.208 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.245 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.245 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  * INET         An implementation of the TCP/IP protocol suite for the LINUX
  4  *              operating system.  INET is implemented using the  BSD Socket
  5  *              interface as the means of communication with the user level.
  6  *
  7  *              Definitions for the Interfaces handler.
  8  *
  9  * Version:     @(#)dev.h       1.0.10  08/12/93
 10  *
 11  * Authors:     Ross Biro
 12  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 13  *              Corey Minyard <wf-rch!minyard@relay.EU.net>
 14  *              Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
 15  *              Alan Cox, <alan@lxorguk.ukuu.org.uk>
 16  *              Bjorn Ekwall. <bj0rn@blox.se>
 17  *              Pekka Riikonen <priikone@poseidon.pspt.fi>
 18  *
 19  *              Moved to /usr/include/linux for NET3
 20  */
 21 #ifndef _LINUX_NETDEVICE_H
 22 #define _LINUX_NETDEVICE_H
 23 
 24 #include <linux/timer.h>
 25 #include <linux/bug.h>
 26 #include <linux/delay.h>
 27 #include <linux/atomic.h>
 28 #include <linux/prefetch.h>
 29 #include <asm/cache.h>
 30 #include <asm/byteorder.h>
 31 
 32 #include <linux/percpu.h>
 33 #include <linux/rculist.h>
 34 #include <linux/workqueue.h>
 35 #include <linux/dynamic_queue_limits.h>
 36 
 37 #include <linux/ethtool.h>
 38 #include <net/net_namespace.h>
 39 #ifdef CONFIG_DCB
 40 #include <net/dcbnl.h>
 41 #endif
 42 #include <net/netprio_cgroup.h>
 43 #include <net/xdp.h>
 44 
 45 #include <linux/netdev_features.h>
 46 #include <linux/neighbour.h>
 47 #include <uapi/linux/netdevice.h>
 48 #include <uapi/linux/if_bonding.h>
 49 #include <uapi/linux/pkt_cls.h>
 50 #include <linux/hashtable.h>
 51 
 52 struct netpoll_info;
 53 struct device;
 54 struct phy_device;
 55 struct dsa_port;
 56 
 57 struct sfp_bus;
 58 /* 802.11 specific */
 59 struct wireless_dev;
 60 /* 802.15.4 specific */
 61 struct wpan_dev;
 62 struct mpls_dev;
 63 /* UDP Tunnel offloads */
 64 struct udp_tunnel_info;
 65 struct bpf_prog;
 66 struct xdp_buff;
 67 
 68 void netdev_set_default_ethtool_ops(struct net_device *dev,
 69                                     const struct ethtool_ops *ops);
 70 
 71 /* Backlog congestion levels */
 72 #define NET_RX_SUCCESS          0       /* keep 'em coming, baby */
 73 #define NET_RX_DROP             1       /* packet dropped */
 74 
 75 /*
 76  * Transmit return codes: transmit return codes originate from three different
 77  * namespaces:
 78  *
 79  * - qdisc return codes
 80  * - driver transmit return codes
 81  * - errno values
 82  *
 83  * Drivers are allowed to return any one of those in their hard_start_xmit()
 84  * function. Real network devices commonly used with qdiscs should only return
 85  * the driver transmit return codes though - when qdiscs are used, the actual
 86  * transmission happens asynchronously, so the value is not propagated to
 87  * higher layers. Virtual network devices transmit synchronously; in this case
 88  * the driver transmit return codes are consumed by dev_queue_xmit(), and all
 89  * others are propagated to higher layers.
 90  */
 91 
 92 /* qdisc ->enqueue() return codes. */
 93 #define NET_XMIT_SUCCESS        0x00
 94 #define NET_XMIT_DROP           0x01    /* skb dropped                  */
 95 #define NET_XMIT_CN             0x02    /* congestion notification      */
 96 #define NET_XMIT_MASK           0x0f    /* qdisc flags in net/sch_generic.h */
 97 
 98 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
 99  * indicates that the device will soon be dropping packets, or already drops
100  * some packets of the same priority; prompting us to send less aggressively. */
101 #define net_xmit_eval(e)        ((e) == NET_XMIT_CN ? 0 : (e))
102 #define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
103 
104 /* Driver transmit return codes */
105 #define NETDEV_TX_MASK          0xf0
106 
107 enum netdev_tx {
108         __NETDEV_TX_MIN  = INT_MIN,     /* make sure enum is signed */
109         NETDEV_TX_OK     = 0x00,        /* driver took care of packet */
110         NETDEV_TX_BUSY   = 0x10,        /* driver tx path was busy*/
111 };
112 typedef enum netdev_tx netdev_tx_t;
113 
114 /*
115  * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
116  * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
117  */
118 static inline bool dev_xmit_complete(int rc)
119 {
120         /*
121          * Positive cases with an skb consumed by a driver:
122          * - successful transmission (rc == NETDEV_TX_OK)
123          * - error while transmitting (rc < 0)
124          * - error while queueing to a different device (rc & NET_XMIT_MASK)
125          */
126         if (likely(rc < NET_XMIT_MASK))
127                 return true;
128 
129         return false;
130 }
131 
132 /*
133  *      Compute the worst-case header length according to the protocols
134  *      used.
135  */
136 
137 #if defined(CONFIG_HYPERV_NET)
138 # define LL_MAX_HEADER 128
139 #elif defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
140 # if defined(CONFIG_MAC80211_MESH)
141 #  define LL_MAX_HEADER 128
142 # else
143 #  define LL_MAX_HEADER 96
144 # endif
145 #else
146 # define LL_MAX_HEADER 32
147 #endif
148 
149 #if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \
150     !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL)
151 #define MAX_HEADER LL_MAX_HEADER
152 #else
153 #define MAX_HEADER (LL_MAX_HEADER + 48)
154 #endif
155 
156 /*
157  *      Old network device statistics. Fields are native words
158  *      (unsigned long) so they can be read and written atomically.
159  */
160 
161 struct net_device_stats {
162         unsigned long   rx_packets;
163         unsigned long   tx_packets;
164         unsigned long   rx_bytes;
165         unsigned long   tx_bytes;
166         unsigned long   rx_errors;
167         unsigned long   tx_errors;
168         unsigned long   rx_dropped;
169         unsigned long   tx_dropped;
170         unsigned long   multicast;
171         unsigned long   collisions;
172         unsigned long   rx_length_errors;
173         unsigned long   rx_over_errors;
174         unsigned long   rx_crc_errors;
175         unsigned long   rx_frame_errors;
176         unsigned long   rx_fifo_errors;
177         unsigned long   rx_missed_errors;
178         unsigned long   tx_aborted_errors;
179         unsigned long   tx_carrier_errors;
180         unsigned long   tx_fifo_errors;
181         unsigned long   tx_heartbeat_errors;
182         unsigned long   tx_window_errors;
183         unsigned long   rx_compressed;
184         unsigned long   tx_compressed;
185 };
186 
187 
188 #include <linux/cache.h>
189 #include <linux/skbuff.h>
190 
191 #ifdef CONFIG_RPS
192 #include <linux/static_key.h>
193 extern struct static_key_false rps_needed;
194 extern struct static_key_false rfs_needed;
195 #endif
196 
197 struct neighbour;
198 struct neigh_parms;
199 struct sk_buff;
200 
201 struct netdev_hw_addr {
202         struct list_head        list;
203         unsigned char           addr[MAX_ADDR_LEN];
204         unsigned char           type;
205 #define NETDEV_HW_ADDR_T_LAN            1
206 #define NETDEV_HW_ADDR_T_SAN            2
207 #define NETDEV_HW_ADDR_T_SLAVE          3
208 #define NETDEV_HW_ADDR_T_UNICAST        4
209 #define NETDEV_HW_ADDR_T_MULTICAST      5
210         bool                    global_use;
211         int                     sync_cnt;
212         int                     refcount;
213         int                     synced;
214         struct rcu_head         rcu_head;
215 };
216 
217 struct netdev_hw_addr_list {
218         struct list_head        list;
219         int                     count;
220 };
221 
222 #define netdev_hw_addr_list_count(l) ((l)->count)
223 #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
224 #define netdev_hw_addr_list_for_each(ha, l) \
225         list_for_each_entry(ha, &(l)->list, list)
226 
227 #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
228 #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
229 #define netdev_for_each_uc_addr(ha, dev) \
230         netdev_hw_addr_list_for_each(ha, &(dev)->uc)
231 
232 #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
233 #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
234 #define netdev_for_each_mc_addr(ha, dev) \
235         netdev_hw_addr_list_for_each(ha, &(dev)->mc)
236 
237 struct hh_cache {
238         unsigned int    hh_len;
239         seqlock_t       hh_lock;
240 
241         /* cached hardware header; allow for machine alignment needs.        */
242 #define HH_DATA_MOD     16
243 #define HH_DATA_OFF(__len) \
244         (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
245 #define HH_DATA_ALIGN(__len) \
246         (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
247         unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
248 };
249 
250 /* Reserve HH_DATA_MOD byte-aligned hard_header_len, but at least that much.
251  * Alternative is:
252  *   dev->hard_header_len ? (dev->hard_header_len +
253  *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
254  *
255  * We could use other alignment values, but we must maintain the
256  * relationship HH alignment <= LL alignment.
257  */
258 #define LL_RESERVED_SPACE(dev) \
259         ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
260 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
261         ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
262 
263 struct header_ops {
264         int     (*create) (struct sk_buff *skb, struct net_device *dev,
265                            unsigned short type, const void *daddr,
266                            const void *saddr, unsigned int len);
267         int     (*parse)(const struct sk_buff *skb, unsigned char *haddr);
268         int     (*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type);
269         void    (*cache_update)(struct hh_cache *hh,
270                                 const struct net_device *dev,
271                                 const unsigned char *haddr);
272         bool    (*validate)(const char *ll_header, unsigned int len);
273         __be16  (*parse_protocol)(const struct sk_buff *skb);
274 };
275 
276 /* These flag bits are private to the generic network queueing
277  * layer; they may not be explicitly referenced by any other
278  * code.
279  */
280 
281 enum netdev_state_t {
282         __LINK_STATE_START,
283         __LINK_STATE_PRESENT,
284         __LINK_STATE_NOCARRIER,
285         __LINK_STATE_LINKWATCH_PENDING,
286         __LINK_STATE_DORMANT,
287 };
288 
289 
290 /*
291  * This structure holds boot-time configured netdevice settings. They
292  * are then used in the device probing.
293  */
294 struct netdev_boot_setup {
295         char name[IFNAMSIZ];
296         struct ifmap map;
297 };
298 #define NETDEV_BOOT_SETUP_MAX 8
299 
300 int __init netdev_boot_setup(char *str);
301 
302 struct gro_list {
303         struct list_head        list;
304         int                     count;
305 };
306 
307 /*
308  * size of gro hash buckets, must less than bit number of
309  * napi_struct::gro_bitmask
310  */
311 #define GRO_HASH_BUCKETS        8
312 
313 /*
314  * Structure for NAPI scheduling similar to tasklet but with weighting
315  */
316 struct napi_struct {
317         /* The poll_list must only be managed by the entity which
318          * changes the state of the NAPI_STATE_SCHED bit.  This means
319          * whoever atomically sets that bit can add this napi_struct
320          * to the per-CPU poll_list, and whoever clears that bit
321          * can remove from the list right before clearing the bit.
322          */
323         struct list_head        poll_list;
324 
325         unsigned long           state;
326         int                     weight;
327         unsigned long           gro_bitmask;
328         int                     (*poll)(struct napi_struct *, int);
329 #ifdef CONFIG_NETPOLL
330         int                     poll_owner;
331 #endif
332         struct net_device       *dev;
333         struct gro_list         gro_hash[GRO_HASH_BUCKETS];
334         struct sk_buff          *skb;
335         struct hrtimer          timer;
336         struct list_head        dev_list;
337         struct hlist_node       napi_hash_node;
338         unsigned int            napi_id;
339 };
340 
341 enum {
342         NAPI_STATE_SCHED,       /* Poll is scheduled */
343         NAPI_STATE_MISSED,      /* reschedule a napi */
344         NAPI_STATE_DISABLE,     /* Disable pending */
345         NAPI_STATE_NPSVC,       /* Netpoll - don't dequeue from poll_list */
346         NAPI_STATE_HASHED,      /* In NAPI hash (busy polling possible) */
347         NAPI_STATE_NO_BUSY_POLL,/* Do not add in napi_hash, no busy polling */
348         NAPI_STATE_IN_BUSY_POLL,/* sk_busy_loop() owns this NAPI */
349 };
350 
351 enum {
352         NAPIF_STATE_SCHED        = BIT(NAPI_STATE_SCHED),
353         NAPIF_STATE_MISSED       = BIT(NAPI_STATE_MISSED),
354         NAPIF_STATE_DISABLE      = BIT(NAPI_STATE_DISABLE),
355         NAPIF_STATE_NPSVC        = BIT(NAPI_STATE_NPSVC),
356         NAPIF_STATE_HASHED       = BIT(NAPI_STATE_HASHED),
357         NAPIF_STATE_NO_BUSY_POLL = BIT(NAPI_STATE_NO_BUSY_POLL),
358         NAPIF_STATE_IN_BUSY_POLL = BIT(NAPI_STATE_IN_BUSY_POLL),
359 };
360 
361 enum gro_result {
362         GRO_MERGED,
363         GRO_MERGED_FREE,
364         GRO_HELD,
365         GRO_NORMAL,
366         GRO_DROP,
367         GRO_CONSUMED,
368 };
369 typedef enum gro_result gro_result_t;
370 
371 /*
372  * enum rx_handler_result - Possible return values for rx_handlers.
373  * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
374  * further.
375  * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
376  * case skb->dev was changed by rx_handler.
377  * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
378  * @RX_HANDLER_PASS: Do nothing, pass the skb as if no rx_handler was called.
379  *
380  * rx_handlers are functions called from inside __netif_receive_skb(), to do
381  * special processing of the skb, prior to delivery to protocol handlers.
382  *
383  * Currently, a net_device can only have a single rx_handler registered. Trying
384  * to register a second rx_handler will return -EBUSY.
385  *
386  * To register a rx_handler on a net_device, use netdev_rx_handler_register().
387  * To unregister a rx_handler on a net_device, use
388  * netdev_rx_handler_unregister().
389  *
390  * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
391  * do with the skb.
392  *
393  * If the rx_handler consumed the skb in some way, it should return
394  * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
395  * the skb to be delivered in some other way.
396  *
397  * If the rx_handler changed skb->dev, to divert the skb to another
398  * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
399  * new device will be called if it exists.
400  *
401  * If the rx_handler decides the skb should be ignored, it should return
402  * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
403  * are registered on exact device (ptype->dev == skb->dev).
404  *
405  * If the rx_handler didn't change skb->dev, but wants the skb to be normally
406  * delivered, it should return RX_HANDLER_PASS.
407  *
408  * A device without a registered rx_handler will behave as if rx_handler
409  * returned RX_HANDLER_PASS.
410  */
411 
412 enum rx_handler_result {
413         RX_HANDLER_CONSUMED,
414         RX_HANDLER_ANOTHER,
415         RX_HANDLER_EXACT,
416         RX_HANDLER_PASS,
417 };
418 typedef enum rx_handler_result rx_handler_result_t;
419 typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
420 
421 void __napi_schedule(struct napi_struct *n);
422 void __napi_schedule_irqoff(struct napi_struct *n);
423 
424 static inline bool napi_disable_pending(struct napi_struct *n)
425 {
426         return test_bit(NAPI_STATE_DISABLE, &n->state);
427 }
428 
429 bool napi_schedule_prep(struct napi_struct *n);
430 
431 /**
432  *      napi_schedule - schedule NAPI poll
433  *      @n: NAPI context
434  *
435  * Schedule NAPI poll routine to be called if it is not already
436  * running.
437  */
438 static inline void napi_schedule(struct napi_struct *n)
439 {
440         if (napi_schedule_prep(n))
441                 __napi_schedule(n);
442 }
443 
444 /**
445  *      napi_schedule_irqoff - schedule NAPI poll
446  *      @n: NAPI context
447  *
448  * Variant of napi_schedule(), assuming hard irqs are masked.
449  */
450 static inline void napi_schedule_irqoff(struct napi_struct *n)
451 {
452         if (napi_schedule_prep(n))
453                 __napi_schedule_irqoff(n);
454 }
455 
456 /* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
457 static inline bool napi_reschedule(struct napi_struct *napi)
458 {
459         if (napi_schedule_prep(napi)) {
460                 __napi_schedule(napi);
461                 return true;
462         }
463         return false;
464 }
465 
466 bool napi_complete_done(struct napi_struct *n, int work_done);
467 /**
468  *      napi_complete - NAPI processing complete
469  *      @n: NAPI context
470  *
471  * Mark NAPI processing as complete.
472  * Consider using napi_complete_done() instead.
473  * Return false if device should avoid rearming interrupts.
474  */
475 static inline bool napi_complete(struct napi_struct *n)
476 {
477         return napi_complete_done(n, 0);
478 }
479 
480 /**
481  *      napi_hash_del - remove a NAPI from global table
482  *      @napi: NAPI context
483  *
484  * Warning: caller must observe RCU grace period
485  * before freeing memory containing @napi, if
486  * this function returns true.
487  * Note: core networking stack automatically calls it
488  * from netif_napi_del().
489  * Drivers might want to call this helper to combine all
490  * the needed RCU grace periods into a single one.
491  */
492 bool napi_hash_del(struct napi_struct *napi);
493 
494 /**
495  *      napi_disable - prevent NAPI from scheduling
496  *      @n: NAPI context
497  *
498  * Stop NAPI from being scheduled on this context.
499  * Waits till any outstanding processing completes.
500  */
501 void napi_disable(struct napi_struct *n);
502 
503 /**
504  *      napi_enable - enable NAPI scheduling
505  *      @n: NAPI context
506  *
507  * Resume NAPI from being scheduled on this context.
508  * Must be paired with napi_disable.
509  */
510 static inline void napi_enable(struct napi_struct *n)
511 {
512         BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
513         smp_mb__before_atomic();
514         clear_bit(NAPI_STATE_SCHED, &n->state);
515         clear_bit(NAPI_STATE_NPSVC, &n->state);
516 }
517 
518 /**
519  *      napi_synchronize - wait until NAPI is not running
520  *      @n: NAPI context
521  *
522  * Wait until NAPI is done being scheduled on this context.
523  * Waits till any outstanding processing completes but
524  * does not disable future activations.
525  */
526 static inline void napi_synchronize(const struct napi_struct *n)
527 {
528         if (IS_ENABLED(CONFIG_SMP))
529                 while (test_bit(NAPI_STATE_SCHED, &n->state))
530                         msleep(1);
531         else
532                 barrier();
533 }
534 
535 /**
536  *      napi_if_scheduled_mark_missed - if napi is running, set the
537  *      NAPIF_STATE_MISSED
538  *      @n: NAPI context
539  *
540  * If napi is running, set the NAPIF_STATE_MISSED, and return true if
541  * NAPI is scheduled.
542  **/
543 static inline bool napi_if_scheduled_mark_missed(struct napi_struct *n)
544 {
545         unsigned long val, new;
546 
547         do {
548                 val = READ_ONCE(n->state);
549                 if (val & NAPIF_STATE_DISABLE)
550                         return true;
551 
552                 if (!(val & NAPIF_STATE_SCHED))
553                         return false;
554 
555                 new = val | NAPIF_STATE_MISSED;
556         } while (cmpxchg(&n->state, val, new) != val);
557 
558         return true;
559 }
560 
561 enum netdev_queue_state_t {
562         __QUEUE_STATE_DRV_XOFF,
563         __QUEUE_STATE_STACK_XOFF,
564         __QUEUE_STATE_FROZEN,
565 };
566 
567 #define QUEUE_STATE_DRV_XOFF    (1 << __QUEUE_STATE_DRV_XOFF)
568 #define QUEUE_STATE_STACK_XOFF  (1 << __QUEUE_STATE_STACK_XOFF)
569 #define QUEUE_STATE_FROZEN      (1 << __QUEUE_STATE_FROZEN)
570 
571 #define QUEUE_STATE_ANY_XOFF    (QUEUE_STATE_DRV_XOFF | QUEUE_STATE_STACK_XOFF)
572 #define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF | \
573                                         QUEUE_STATE_FROZEN)
574 #define QUEUE_STATE_DRV_XOFF_OR_FROZEN (QUEUE_STATE_DRV_XOFF | \
575                                         QUEUE_STATE_FROZEN)
576 
577 /*
578  * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue.  The
579  * netif_tx_* functions below are used to manipulate this flag.  The
580  * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
581  * queue independently.  The netif_xmit_*stopped functions below are called
582  * to check if the queue has been stopped by the driver or stack (either
583  * of the XOFF bits are set in the state).  Drivers should not need to call
584  * netif_xmit*stopped functions, they should only be using netif_tx_*.
585  */
586 
587 struct netdev_queue {
588 /*
589  * read-mostly part
590  */
591         struct net_device       *dev;
592         struct Qdisc __rcu      *qdisc;
593         struct Qdisc            *qdisc_sleeping;
594 #ifdef CONFIG_SYSFS
595         struct kobject          kobj;
596 #endif
597 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
598         int                     numa_node;
599 #endif
600         unsigned long           tx_maxrate;
601         /*
602          * Number of TX timeouts for this queue
603          * (/sys/class/net/DEV/Q/trans_timeout)
604          */
605         unsigned long           trans_timeout;
606 
607         /* Subordinate device that the queue has been assigned to */
608         struct net_device       *sb_dev;
609 #ifdef CONFIG_XDP_SOCKETS
610         struct xdp_umem         *umem;
611 #endif
612 /*
613  * write-mostly part
614  */
615         spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
616         int                     xmit_lock_owner;
617         /*
618          * Time (in jiffies) of last Tx
619          */
620         unsigned long           trans_start;
621 
622         unsigned long           state;
623 
624 #ifdef CONFIG_BQL
625         struct dql              dql;
626 #endif
627 } ____cacheline_aligned_in_smp;
628 
629 extern int sysctl_fb_tunnels_only_for_init_net;
630 extern int sysctl_devconf_inherit_init_net;
631 
632 static inline bool net_has_fallback_tunnels(const struct net *net)
633 {
634         return net == &init_net ||
635                !IS_ENABLED(CONFIG_SYSCTL) ||
636                !sysctl_fb_tunnels_only_for_init_net;
637 }
638 
639 static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
640 {
641 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
642         return q->numa_node;
643 #else
644         return NUMA_NO_NODE;
645 #endif
646 }
647 
648 static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
649 {
650 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
651         q->numa_node = node;
652 #endif
653 }
654 
655 #ifdef CONFIG_RPS
656 /*
657  * This structure holds an RPS map which can be of variable length.  The
658  * map is an array of CPUs.
659  */
660 struct rps_map {
661         unsigned int len;
662         struct rcu_head rcu;
663         u16 cpus[0];
664 };
665 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
666 
667 /*
668  * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
669  * tail pointer for that CPU's input queue at the time of last enqueue, and
670  * a hardware filter index.
671  */
672 struct rps_dev_flow {
673         u16 cpu;
674         u16 filter;
675         unsigned int last_qtail;
676 };
677 #define RPS_NO_FILTER 0xffff
678 
679 /*
680  * The rps_dev_flow_table structure contains a table of flow mappings.
681  */
682 struct rps_dev_flow_table {
683         unsigned int mask;
684         struct rcu_head rcu;
685         struct rps_dev_flow flows[0];
686 };
687 #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
688     ((_num) * sizeof(struct rps_dev_flow)))
689 
690 /*
691  * The rps_sock_flow_table contains mappings of flows to the last CPU
692  * on which they were processed by the application (set in recvmsg).
693  * Each entry is a 32bit value. Upper part is the high-order bits
694  * of flow hash, lower part is CPU number.
695  * rps_cpu_mask is used to partition the space, depending on number of
696  * possible CPUs : rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1
697  * For example, if 64 CPUs are possible, rps_cpu_mask = 0x3f,
698  * meaning we use 32-6=26 bits for the hash.
699  */
700 struct rps_sock_flow_table {
701         u32     mask;
702 
703         u32     ents[0] ____cacheline_aligned_in_smp;
704 };
705 #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (offsetof(struct rps_sock_flow_table, ents[_num]))
706 
707 #define RPS_NO_CPU 0xffff
708 
709 extern u32 rps_cpu_mask;
710 extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
711 
712 static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
713                                         u32 hash)
714 {
715         if (table && hash) {
716                 unsigned int index = hash & table->mask;
717                 u32 val = hash & ~rps_cpu_mask;
718 
719                 /* We only give a hint, preemption can change CPU under us */
720                 val |= raw_smp_processor_id();
721 
722                 if (table->ents[index] != val)
723                         table->ents[index] = val;
724         }
725 }
726 
727 #ifdef CONFIG_RFS_ACCEL
728 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id,
729                          u16 filter_id);
730 #endif
731 #endif /* CONFIG_RPS */
732 
733 /* This structure contains an instance of an RX queue. */
734 struct netdev_rx_queue {
735 #ifdef CONFIG_RPS
736         struct rps_map __rcu            *rps_map;
737         struct rps_dev_flow_table __rcu *rps_flow_table;
738 #endif
739         struct kobject                  kobj;
740         struct net_device               *dev;
741         struct xdp_rxq_info             xdp_rxq;
742 #ifdef CONFIG_XDP_SOCKETS
743         struct xdp_umem                 *umem;
744 #endif
745 } ____cacheline_aligned_in_smp;
746 
747 /*
748  * RX queue sysfs structures and functions.
749  */
750 struct rx_queue_attribute {
751         struct attribute attr;
752         ssize_t (*show)(struct netdev_rx_queue *queue, char *buf);
753         ssize_t (*store)(struct netdev_rx_queue *queue,
754                          const char *buf, size_t len);
755 };
756 
757 #ifdef CONFIG_XPS
758 /*
759  * This structure holds an XPS map which can be of variable length.  The
760  * map is an array of queues.
761  */
762 struct xps_map {
763         unsigned int len;
764         unsigned int alloc_len;
765         struct rcu_head rcu;
766         u16 queues[0];
767 };
768 #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
769 #define XPS_MIN_MAP_ALLOC ((L1_CACHE_ALIGN(offsetof(struct xps_map, queues[1])) \
770        - sizeof(struct xps_map)) / sizeof(u16))
771 
772 /*
773  * This structure holds all XPS maps for device.  Maps are indexed by CPU.
774  */
775 struct xps_dev_maps {
776         struct rcu_head rcu;
777         struct xps_map __rcu *attr_map[0]; /* Either CPUs map or RXQs map */
778 };
779 
780 #define XPS_CPU_DEV_MAPS_SIZE(_tcs) (sizeof(struct xps_dev_maps) +      \
781         (nr_cpu_ids * (_tcs) * sizeof(struct xps_map *)))
782 
783 #define XPS_RXQ_DEV_MAPS_SIZE(_tcs, _rxqs) (sizeof(struct xps_dev_maps) +\
784         (_rxqs * (_tcs) * sizeof(struct xps_map *)))
785 
786 #endif /* CONFIG_XPS */
787 
788 #define TC_MAX_QUEUE    16
789 #define TC_BITMASK      15
790 /* HW offloaded queuing disciplines txq count and offset maps */
791 struct netdev_tc_txq {
792         u16 count;
793         u16 offset;
794 };
795 
796 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
797 /*
798  * This structure is to hold information about the device
799  * configured to run FCoE protocol stack.
800  */
801 struct netdev_fcoe_hbainfo {
802         char    manufacturer[64];
803         char    serial_number[64];
804         char    hardware_version[64];
805         char    driver_version[64];
806         char    optionrom_version[64];
807         char    firmware_version[64];
808         char    model[256];
809         char    model_description[256];
810 };
811 #endif
812 
813 #define MAX_PHYS_ITEM_ID_LEN 32
814 
815 /* This structure holds a unique identifier to identify some
816  * physical item (port for example) used by a netdevice.
817  */
818 struct netdev_phys_item_id {
819         unsigned char id[MAX_PHYS_ITEM_ID_LEN];
820         unsigned char id_len;
821 };
822 
823 static inline bool netdev_phys_item_id_same(struct netdev_phys_item_id *a,
824                                             struct netdev_phys_item_id *b)
825 {
826         return a->id_len == b->id_len &&
827                memcmp(a->id, b->id, a->id_len) == 0;
828 }
829 
830 typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
831                                        struct sk_buff *skb,
832                                        struct net_device *sb_dev);
833 
834 enum tc_setup_type {
835         TC_SETUP_QDISC_MQPRIO,
836         TC_SETUP_CLSU32,
837         TC_SETUP_CLSFLOWER,
838         TC_SETUP_CLSMATCHALL,
839         TC_SETUP_CLSBPF,
840         TC_SETUP_BLOCK,
841         TC_SETUP_QDISC_CBS,
842         TC_SETUP_QDISC_RED,
843         TC_SETUP_QDISC_PRIO,
844         TC_SETUP_QDISC_MQ,
845         TC_SETUP_QDISC_ETF,
846         TC_SETUP_ROOT_QDISC,
847         TC_SETUP_QDISC_GRED,
848 };
849 
850 /* These structures hold the attributes of bpf state that are being passed
851  * to the netdevice through the bpf op.
852  */
853 enum bpf_netdev_command {
854         /* Set or clear a bpf program used in the earliest stages of packet
855          * rx. The prog will have been loaded as BPF_PROG_TYPE_XDP. The callee
856          * is responsible for calling bpf_prog_put on any old progs that are
857          * stored. In case of error, the callee need not release the new prog
858          * reference, but on success it takes ownership and must bpf_prog_put
859          * when it is no longer used.
860          */
861         XDP_SETUP_PROG,
862         XDP_SETUP_PROG_HW,
863         XDP_QUERY_PROG,
864         XDP_QUERY_PROG_HW,
865         /* BPF program for offload callbacks, invoked at program load time. */
866         BPF_OFFLOAD_MAP_ALLOC,
867         BPF_OFFLOAD_MAP_FREE,
868         XDP_SETUP_XSK_UMEM,
869 };
870 
871 struct bpf_prog_offload_ops;
872 struct netlink_ext_ack;
873 struct xdp_umem;
874 
875 struct netdev_bpf {
876         enum bpf_netdev_command command;
877         union {
878                 /* XDP_SETUP_PROG */
879                 struct {
880                         u32 flags;
881                         struct bpf_prog *prog;
882                         struct netlink_ext_ack *extack;
883                 };
884                 /* XDP_QUERY_PROG, XDP_QUERY_PROG_HW */
885                 struct {
886                         u32 prog_id;
887                         /* flags with which program was installed */
888                         u32 prog_flags;
889                 };
890                 /* BPF_OFFLOAD_MAP_ALLOC, BPF_OFFLOAD_MAP_FREE */
891                 struct {
892                         struct bpf_offloaded_map *offmap;
893                 };
894                 /* XDP_SETUP_XSK_UMEM */
895                 struct {
896                         struct xdp_umem *umem;
897                         u16 queue_id;
898                 } xsk;
899         };
900 };
901 
902 #ifdef CONFIG_XFRM_OFFLOAD
903 struct xfrmdev_ops {
904         int     (*xdo_dev_state_add) (struct xfrm_state *x);
905         void    (*xdo_dev_state_delete) (struct xfrm_state *x);
906         void    (*xdo_dev_state_free) (struct xfrm_state *x);
907         bool    (*xdo_dev_offload_ok) (struct sk_buff *skb,
908                                        struct xfrm_state *x);
909         void    (*xdo_dev_state_advance_esn) (struct xfrm_state *x);
910 };
911 #endif
912 
913 struct dev_ifalias {
914         struct rcu_head rcuhead;
915         char ifalias[];
916 };
917 
918 struct devlink;
919 struct tlsdev_ops;
920 
921 /*
922  * This structure defines the management hooks for network devices.
923  * The following hooks can be defined; unless noted otherwise, they are
924  * optional and can be filled with a null pointer.
925  *
926  * int (*ndo_init)(struct net_device *dev);
927  *     This function is called once when a network device is registered.
928  *     The network device can use this for any late stage initialization
929  *     or semantic validation. It can fail with an error code which will
930  *     be propagated back to register_netdev.
931  *
932  * void (*ndo_uninit)(struct net_device *dev);
933  *     This function is called when device is unregistered or when registration
934  *     fails. It is not called if init fails.
935  *
936  * int (*ndo_open)(struct net_device *dev);
937  *     This function is called when a network device transitions to the up
938  *     state.
939  *
940  * int (*ndo_stop)(struct net_device *dev);
941  *     This function is called when a network device transitions to the down
942  *     state.
943  *
944  * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
945  *                               struct net_device *dev);
946  *      Called when a packet needs to be transmitted.
947  *      Returns NETDEV_TX_OK.  Can return NETDEV_TX_BUSY, but you should stop
948  *      the queue before that can happen; it's for obsolete devices and weird
949  *      corner cases, but the stack really does a non-trivial amount
950  *      of useless work if you return NETDEV_TX_BUSY.
951  *      Required; cannot be NULL.
952  *
953  * netdev_features_t (*ndo_features_check)(struct sk_buff *skb,
954  *                                         struct net_device *dev
955  *                                         netdev_features_t features);
956  *      Called by core transmit path to determine if device is capable of
957  *      performing offload operations on a given packet. This is to give
958  *      the device an opportunity to implement any restrictions that cannot
959  *      be otherwise expressed by feature flags. The check is called with
960  *      the set of features that the stack has calculated and it returns
961  *      those the driver believes to be appropriate.
962  *
963  * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb,
964  *                         struct net_device *sb_dev);
965  *      Called to decide which queue to use when device supports multiple
966  *      transmit queues.
967  *
968  * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
969  *      This function is called to allow device receiver to make
970  *      changes to configuration when multicast or promiscuous is enabled.
971  *
972  * void (*ndo_set_rx_mode)(struct net_device *dev);
973  *      This function is called device changes address list filtering.
974  *      If driver handles unicast address filtering, it should set
975  *      IFF_UNICAST_FLT in its priv_flags.
976  *
977  * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
978  *      This function  is called when the Media Access Control address
979  *      needs to be changed. If this interface is not defined, the
980  *      MAC address can not be changed.
981  *
982  * int (*ndo_validate_addr)(struct net_device *dev);
983  *      Test if Media Access Control address is valid for the device.
984  *
985  * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
986  *      Called when a user requests an ioctl which can't be handled by
987  *      the generic interface code. If not defined ioctls return
988  *      not supported error code.
989  *
990  * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
991  *      Used to set network devices bus interface parameters. This interface
992  *      is retained for legacy reasons; new devices should use the bus
993  *      interface (PCI) for low level management.
994  *
995  * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
996  *      Called when a user wants to change the Maximum Transfer Unit
997  *      of a device.
998  *
999  * void (*ndo_tx_timeout)(struct net_device *dev);
1000  *      Callback used when the transmitter has not made any progress
1001  *      for dev->watchdog ticks.
1002  *
1003  * void (*ndo_get_stats64)(struct net_device *dev,
1004  *                         struct rtnl_link_stats64 *storage);
1005  * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
1006  *      Called when a user wants to get the network device usage
1007  *      statistics. Drivers must do one of the following:
1008  *      1. Define @ndo_get_stats64 to fill in a zero-initialised
1009  *         rtnl_link_stats64 structure passed by the caller.
1010  *      2. Define @ndo_get_stats to update a net_device_stats structure
1011  *         (which should normally be dev->stats) and return a pointer to
1012  *         it. The structure may be changed asynchronously only if each
1013  *         field is written atomically.
1014  *      3. Update dev->stats asynchronously and atomically, and define
1015  *         neither operation.
1016  *
1017  * bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id)
1018  *      Return true if this device supports offload stats of this attr_id.
1019  *
1020  * int (*ndo_get_offload_stats)(int attr_id, const struct net_device *dev,
1021  *      void *attr_data)
1022  *      Get statistics for offload operations by attr_id. Write it into the
1023  *      attr_data pointer.
1024  *
1025  * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16 vid);
1026  *      If device supports VLAN filtering this function is called when a
1027  *      VLAN id is registered.
1028  *
1029  * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, __be16 proto, u16 vid);
1030  *      If device supports VLAN filtering this function is called when a
1031  *      VLAN id is unregistered.
1032  *
1033  * void (*ndo_poll_controller)(struct net_device *dev);
1034  *
1035  *      SR-IOV management functions.
1036  * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
1037  * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan,
1038  *                        u8 qos, __be16 proto);
1039  * int (*ndo_set_vf_rate)(struct net_device *dev, int vf, int min_tx_rate,
1040  *                        int max_tx_rate);
1041  * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
1042  * int (*ndo_set_vf_trust)(struct net_device *dev, int vf, bool setting);
1043  * int (*ndo_get_vf_config)(struct net_device *dev,
1044  *                          int vf, struct ifla_vf_info *ivf);
1045  * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state);
1046  * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
1047  *                        struct nlattr *port[]);
1048  *
1049  *      Enable or disable the VF ability to query its RSS Redirection Table and
1050  *      Hash Key. This is needed since on some devices VF share this information
1051  *      with PF and querying it may introduce a theoretical security risk.
1052  * int (*ndo_set_vf_rss_query_en)(struct net_device *dev, int vf, bool setting);
1053  * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
1054  * int (*ndo_setup_tc)(struct net_device *dev, enum tc_setup_type type,
1055  *                     void *type_data);
1056  *      Called to setup any 'tc' scheduler, classifier or action on @dev.
1057  *      This is always called from the stack with the rtnl lock held and netif
1058  *      tx queues stopped. This allows the netdevice to perform queue
1059  *      management safely.
1060  *
1061  *      Fiber Channel over Ethernet (FCoE) offload functions.
1062  * int (*ndo_fcoe_enable)(struct net_device *dev);
1063  *      Called when the FCoE protocol stack wants to start using LLD for FCoE
1064  *      so the underlying device can perform whatever needed configuration or
1065  *      initialization to support acceleration of FCoE traffic.
1066  *
1067  * int (*ndo_fcoe_disable)(struct net_device *dev);
1068  *      Called when the FCoE protocol stack wants to stop using LLD for FCoE
1069  *      so the underlying device can perform whatever needed clean-ups to
1070  *      stop supporting acceleration of FCoE traffic.
1071  *
1072  * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid,
1073  *                           struct scatterlist *sgl, unsigned int sgc);
1074  *      Called when the FCoE Initiator wants to initialize an I/O that
1075  *      is a possible candidate for Direct Data Placement (DDP). The LLD can
1076  *      perform necessary setup and returns 1 to indicate the device is set up
1077  *      successfully to perform DDP on this I/O, otherwise this returns 0.
1078  *
1079  * int (*ndo_fcoe_ddp_done)(struct net_device *dev,  u16 xid);
1080  *      Called when the FCoE Initiator/Target is done with the DDPed I/O as
1081  *      indicated by the FC exchange id 'xid', so the underlying device can
1082  *      clean up and reuse resources for later DDP requests.
1083  *
1084  * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid,
1085  *                            struct scatterlist *sgl, unsigned int sgc);
1086  *      Called when the FCoE Target wants to initialize an I/O that
1087  *      is a possible candidate for Direct Data Placement (DDP). The LLD can
1088  *      perform necessary setup and returns 1 to indicate the device is set up
1089  *      successfully to perform DDP on this I/O, otherwise this returns 0.
1090  *
1091  * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
1092  *                             struct netdev_fcoe_hbainfo *hbainfo);
1093  *      Called when the FCoE Protocol stack wants information on the underlying
1094  *      device. This information is utilized by the FCoE protocol stack to
1095  *      register attributes with Fiber Channel management service as per the
1096  *      FC-GS Fabric Device Management Information(FDMI) specification.
1097  *
1098  * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type);
1099  *      Called when the underlying device wants to override default World Wide
1100  *      Name (WWN) generation mechanism in FCoE protocol stack to pass its own
1101  *      World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE
1102  *      protocol stack to use.
1103  *
1104  *      RFS acceleration.
1105  * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb,
1106  *                          u16 rxq_index, u32 flow_id);
1107  *      Set hardware filter for RFS.  rxq_index is the target queue index;
1108  *      flow_id is a flow ID to be passed to rps_may_expire_flow() later.
1109  *      Return the filter ID on success, or a negative error code.
1110  *
1111  *      Slave management functions (for bridge, bonding, etc).
1112  * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
1113  *      Called to make another netdev an underling.
1114  *
1115  * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
1116  *      Called to release previously enslaved netdev.
1117  *
1118  *      Feature/offload setting functions.
1119  * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
1120  *              netdev_features_t features);
1121  *      Adjusts the requested feature flags according to device-specific
1122  *      constraints, and returns the resulting flags. Must not modify
1123  *      the device state.
1124  *
1125  * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
1126  *      Called to update device configuration to new features. Passed
1127  *      feature set might be less than what was returned by ndo_fix_features()).
1128  *      Must return >0 or -errno if it changed dev->features itself.
1129  *
1130  * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
1131  *                    struct net_device *dev,
1132  *                    const unsigned char *addr, u16 vid, u16 flags,
1133  *                    struct netlink_ext_ack *extack);
1134  *      Adds an FDB entry to dev for addr.
1135  * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[],
1136  *                    struct net_device *dev,
1137  *                    const unsigned char *addr, u16 vid)
1138  *      Deletes the FDB entry from dev coresponding to addr.
1139  * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
1140  *                     struct net_device *dev, struct net_device *filter_dev,
1141  *                     int *idx)
1142  *      Used to add FDB entries to dump requests. Implementers should add
1143  *      entries to skb and update idx with the number of entries.
1144  *
1145  * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh,
1146  *                           u16 flags, struct netlink_ext_ack *extack)
1147  * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq,
1148  *                           struct net_device *dev, u32 filter_mask,
1149  *                           int nlflags)
1150  * int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh,
1151  *                           u16 flags);
1152  *
1153  * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier);
1154  *      Called to change device carrier. Soft-devices (like dummy, team, etc)
1155  *      which do not represent real hardware may define this to allow their
1156  *      userspace components to manage their virtual carrier state. Devices
1157  *      that determine carrier state from physical hardware properties (eg
1158  *      network cables) or protocol-dependent mechanisms (eg
1159  *      USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function.
1160  *
1161  * int (*ndo_get_phys_port_id)(struct net_device *dev,
1162  *                             struct netdev_phys_item_id *ppid);
1163  *      Called to get ID of physical port of this device. If driver does
1164  *      not implement this, it is assumed that the hw is not able to have
1165  *      multiple net devices on single physical port.
1166  *
1167  * int (*ndo_get_port_parent_id)(struct net_device *dev,
1168  *                               struct netdev_phys_item_id *ppid)
1169  *      Called to get the parent ID of the physical port of this device.
1170  *
1171  * void (*ndo_udp_tunnel_add)(struct net_device *dev,
1172  *                            struct udp_tunnel_info *ti);
1173  *      Called by UDP tunnel to notify a driver about the UDP port and socket
1174  *      address family that a UDP tunnel is listnening to. It is called only
1175  *      when a new port starts listening. The operation is protected by the
1176  *      RTNL.
1177  *
1178  * void (*ndo_udp_tunnel_del)(struct net_device *dev,
1179  *                            struct udp_tunnel_info *ti);
1180  *      Called by UDP tunnel to notify the driver about a UDP port and socket
1181  *      address family that the UDP tunnel is not listening to anymore. The
1182  *      operation is protected by the RTNL.
1183  *
1184  * void* (*ndo_dfwd_add_station)(struct net_device *pdev,
1185  *                               struct net_device *dev)
1186  *      Called by upper layer devices to accelerate switching or other
1187  *      station functionality into hardware. 'pdev is the lowerdev
1188  *      to use for the offload and 'dev' is the net device that will
1189  *      back the offload. Returns a pointer to the private structure
1190  *      the upper layer will maintain.
1191  * void (*ndo_dfwd_del_station)(struct net_device *pdev, void *priv)
1192  *      Called by upper layer device to delete the station created
1193  *      by 'ndo_dfwd_add_station'. 'pdev' is the net device backing
1194  *      the station and priv is the structure returned by the add
1195  *      operation.
1196  * int (*ndo_set_tx_maxrate)(struct net_device *dev,
1197  *                           int queue_index, u32 maxrate);
1198  *      Called when a user wants to set a max-rate limitation of specific
1199  *      TX queue.
1200  * int (*ndo_get_iflink)(const struct net_device *dev);
1201  *      Called to get the iflink value of this device.
1202  * void (*ndo_change_proto_down)(struct net_device *dev,
1203  *                               bool proto_down);
1204  *      This function is used to pass protocol port error state information
1205  *      to the switch driver. The switch driver can react to the proto_down
1206  *      by doing a phys down on the associated switch port.
1207  * int (*ndo_fill_metadata_dst)(struct net_device *dev, struct sk_buff *skb);
1208  *      This function is used to get egress tunnel information for given skb.
1209  *      This is useful for retrieving outer tunnel header parameters while
1210  *      sampling packet.
1211  * void (*ndo_set_rx_headroom)(struct net_device *dev, int needed_headroom);
1212  *      This function is used to specify the headroom that the skb must
1213  *      consider when allocation skb during packet reception. Setting
1214  *      appropriate rx headroom value allows avoiding skb head copy on
1215  *      forward. Setting a negative value resets the rx headroom to the
1216  *      default value.
1217  * int (*ndo_bpf)(struct net_device *dev, struct netdev_bpf *bpf);
1218  *      This function is used to set or query state related to XDP on the
1219  *      netdevice and manage BPF offload. See definition of
1220  *      enum bpf_netdev_command for details.
1221  * int (*ndo_xdp_xmit)(struct net_device *dev, int n, struct xdp_frame **xdp,
1222  *                      u32 flags);
1223  *      This function is used to submit @n XDP packets for transmit on a
1224  *      netdevice. Returns number of frames successfully transmitted, frames
1225  *      that got dropped are freed/returned via xdp_return_frame().
1226  *      Returns negative number, means general error invoking ndo, meaning
1227  *      no frames were xmit'ed and core-caller will free all frames.
1228  * struct devlink_port *(*ndo_get_devlink_port)(struct net_device *dev);
1229  *      Get devlink port instance associated with a given netdev.
1230  *      Called with a reference on the netdevice and devlink locks only,
1231  *      rtnl_lock is not held.
1232  */
1233 struct net_device_ops {
1234         int                     (*ndo_init)(struct net_device *dev);
1235         void                    (*ndo_uninit)(struct net_device *dev);
1236         int                     (*ndo_open)(struct net_device *dev);
1237         int                     (*ndo_stop)(struct net_device *dev);
1238         netdev_tx_t             (*ndo_start_xmit)(struct sk_buff *skb,
1239                                                   struct net_device *dev);
1240         netdev_features_t       (*ndo_features_check)(struct sk_buff *skb,
1241                                                       struct net_device *dev,
1242                                                       netdev_features_t features);
1243         u16                     (*ndo_select_queue)(struct net_device *dev,
1244                                                     struct sk_buff *skb,
1245                                                     struct net_device *sb_dev);
1246         void                    (*ndo_change_rx_flags)(struct net_device *dev,
1247                                                        int flags);
1248         void                    (*ndo_set_rx_mode)(struct net_device *dev);
1249         int                     (*ndo_set_mac_address)(struct net_device *dev,
1250                                                        void *addr);
1251         int                     (*ndo_validate_addr)(struct net_device *dev);
1252         int                     (*ndo_do_ioctl)(struct net_device *dev,
1253                                                 struct ifreq *ifr, int cmd);
1254         int                     (*ndo_set_config)(struct net_device *dev,
1255                                                   struct ifmap *map);
1256         int                     (*ndo_change_mtu)(struct net_device *dev,
1257                                                   int new_mtu);
1258         int                     (*ndo_neigh_setup)(struct net_device *dev,
1259                                                    struct neigh_parms *);
1260         void                    (*ndo_tx_timeout) (struct net_device *dev);
1261 
1262         void                    (*ndo_get_stats64)(struct net_device *dev,
1263                                                    struct rtnl_link_stats64 *storage);
1264         bool                    (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id);
1265         int                     (*ndo_get_offload_stats)(int attr_id,
1266                                                          const struct net_device *dev,
1267                                                          void *attr_data);
1268         struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
1269 
1270         int                     (*ndo_vlan_rx_add_vid)(struct net_device *dev,
1271                                                        __be16 proto, u16 vid);
1272         int                     (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
1273                                                         __be16 proto, u16 vid);
1274 #ifdef CONFIG_NET_POLL_CONTROLLER
1275         void                    (*ndo_poll_controller)(struct net_device *dev);
1276         int                     (*ndo_netpoll_setup)(struct net_device *dev,
1277                                                      struct netpoll_info *info);
1278         void                    (*ndo_netpoll_cleanup)(struct net_device *dev);
1279 #endif
1280         int                     (*ndo_set_vf_mac)(struct net_device *dev,
1281                                                   int queue, u8 *mac);
1282         int                     (*ndo_set_vf_vlan)(struct net_device *dev,
1283                                                    int queue, u16 vlan,
1284                                                    u8 qos, __be16 proto);
1285         int                     (*ndo_set_vf_rate)(struct net_device *dev,
1286                                                    int vf, int min_tx_rate,
1287                                                    int max_tx_rate);
1288         int                     (*ndo_set_vf_spoofchk)(struct net_device *dev,
1289                                                        int vf, bool setting);
1290         int                     (*ndo_set_vf_trust)(struct net_device *dev,
1291                                                     int vf, bool setting);
1292         int                     (*ndo_get_vf_config)(struct net_device *dev,
1293                                                      int vf,
1294                                                      struct ifla_vf_info *ivf);
1295         int                     (*ndo_set_vf_link_state)(struct net_device *dev,
1296                                                          int vf, int link_state);
1297         int                     (*ndo_get_vf_stats)(struct net_device *dev,
1298                                                     int vf,
1299                                                     struct ifla_vf_stats
1300                                                     *vf_stats);
1301         int                     (*ndo_set_vf_port)(struct net_device *dev,
1302                                                    int vf,
1303                                                    struct nlattr *port[]);
1304         int                     (*ndo_get_vf_port)(struct net_device *dev,
1305                                                    int vf, struct sk_buff *skb);
1306         int                     (*ndo_set_vf_guid)(struct net_device *dev,
1307                                                    int vf, u64 guid,
1308                                                    int guid_type);
1309         int                     (*ndo_set_vf_rss_query_en)(
1310                                                    struct net_device *dev,
1311                                                    int vf, bool setting);
1312         int                     (*ndo_setup_tc)(struct net_device *dev,
1313                                                 enum tc_setup_type type,
1314                                                 void *type_data);
1315 #if IS_ENABLED(CONFIG_FCOE)
1316         int                     (*ndo_fcoe_enable)(struct net_device *dev);
1317         int                     (*ndo_fcoe_disable)(struct net_device *dev);
1318         int                     (*ndo_fcoe_ddp_setup)(struct net_device *dev,
1319                                                       u16 xid,
1320                                                       struct scatterlist *sgl,
1321                                                       unsigned int sgc);
1322         int                     (*ndo_fcoe_ddp_done)(struct net_device *dev,
1323                                                      u16 xid);
1324         int                     (*ndo_fcoe_ddp_target)(struct net_device *dev,
1325                                                        u16 xid,
1326                                                        struct scatterlist *sgl,
1327                                                        unsigned int sgc);
1328         int                     (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
1329                                                         struct netdev_fcoe_hbainfo *hbainfo);
1330 #endif
1331 
1332 #if IS_ENABLED(CONFIG_LIBFCOE)
1333 #define NETDEV_FCOE_WWNN 0
1334 #define NETDEV_FCOE_WWPN 1
1335         int                     (*ndo_fcoe_get_wwn)(struct net_device *dev,
1336                                                     u64 *wwn, int type);
1337 #endif
1338 
1339 #ifdef CONFIG_RFS_ACCEL
1340         int                     (*ndo_rx_flow_steer)(struct net_device *dev,
1341                                                      const struct sk_buff *skb,
1342                                                      u16 rxq_index,
1343                                                      u32 flow_id);
1344 #endif
1345         int                     (*ndo_add_slave)(struct net_device *dev,
1346                                                  struct net_device *slave_dev,
1347                                                  struct netlink_ext_ack *extack);
1348         int                     (*ndo_del_slave)(struct net_device *dev,
1349                                                  struct net_device *slave_dev);
1350         netdev_features_t       (*ndo_fix_features)(struct net_device *dev,
1351                                                     netdev_features_t features);
1352         int                     (*ndo_set_features)(struct net_device *dev,
1353                                                     netdev_features_t features);
1354         int                     (*ndo_neigh_construct)(struct net_device *dev,
1355                                                        struct neighbour *n);
1356         void                    (*ndo_neigh_destroy)(struct net_device *dev,
1357                                                      struct neighbour *n);
1358 
1359         int                     (*ndo_fdb_add)(struct ndmsg *ndm,
1360                                                struct nlattr *tb[],
1361                                                struct net_device *dev,
1362                                                const unsigned char *addr,
1363                                                u16 vid,
1364                                                u16 flags,
1365                                                struct netlink_ext_ack *extack);
1366         int                     (*ndo_fdb_del)(struct ndmsg *ndm,
1367                                                struct nlattr *tb[],
1368                                                struct net_device *dev,
1369                                                const unsigned char *addr,
1370                                                u16 vid);
1371         int                     (*ndo_fdb_dump)(struct sk_buff *skb,
1372                                                 struct netlink_callback *cb,
1373                                                 struct net_device *dev,
1374                                                 struct net_device *filter_dev,
1375                                                 int *idx);
1376         int                     (*ndo_fdb_get)(struct sk_buff *skb,
1377                                                struct nlattr *tb[],
1378                                                struct net_device *dev,
1379                                                const unsigned char *addr,
1380                                                u16 vid, u32 portid, u32 seq,
1381                                                struct netlink_ext_ack *extack);
1382         int                     (*ndo_bridge_setlink)(struct net_device *dev,
1383                                                       struct nlmsghdr *nlh,
1384                                                       u16 flags,
1385                                                       struct netlink_ext_ack *extack);
1386         int                     (*ndo_bridge_getlink)(struct sk_buff *skb,
1387                                                       u32 pid, u32 seq,
1388                                                       struct net_device *dev,
1389                                                       u32 filter_mask,
1390                                                       int nlflags);
1391         int                     (*ndo_bridge_dellink)(struct net_device *dev,
1392                                                       struct nlmsghdr *nlh,
1393                                                       u16 flags);
1394         int                     (*ndo_change_carrier)(struct net_device *dev,
1395                                                       bool new_carrier);
1396         int                     (*ndo_get_phys_port_id)(struct net_device *dev,
1397                                                         struct netdev_phys_item_id *ppid);
1398         int                     (*ndo_get_port_parent_id)(struct net_device *dev,
1399                                                           struct netdev_phys_item_id *ppid);
1400         int                     (*ndo_get_phys_port_name)(struct net_device *dev,
1401                                                           char *name, size_t len);
1402         void                    (*ndo_udp_tunnel_add)(struct net_device *dev,
1403                                                       struct udp_tunnel_info *ti);
1404         void                    (*ndo_udp_tunnel_del)(struct net_device *dev,
1405                                                       struct udp_tunnel_info *ti);
1406         void*                   (*ndo_dfwd_add_station)(struct net_device *pdev,
1407                                                         struct net_device *dev);
1408         void                    (*ndo_dfwd_del_station)(struct net_device *pdev,
1409                                                         void *priv);
1410 
1411         int                     (*ndo_get_lock_subclass)(struct net_device *dev);
1412         int                     (*ndo_set_tx_maxrate)(struct net_device *dev,
1413                                                       int queue_index,
1414                                                       u32 maxrate);
1415         int                     (*ndo_get_iflink)(const struct net_device *dev);
1416         int                     (*ndo_change_proto_down)(struct net_device *dev,
1417                                                          bool proto_down);
1418         int                     (*ndo_fill_metadata_dst)(struct net_device *dev,
1419                                                        struct sk_buff *skb);
1420         void                    (*ndo_set_rx_headroom)(struct net_device *dev,
1421                                                        int needed_headroom);
1422         int                     (*ndo_bpf)(struct net_device *dev,
1423                                            struct netdev_bpf *bpf);
1424         int                     (*ndo_xdp_xmit)(struct net_device *dev, int n,
1425                                                 struct xdp_frame **xdp,
1426                                                 u32 flags);
1427         int                     (*ndo_xsk_async_xmit)(struct net_device *dev,
1428                                                       u32 queue_id);
1429         struct devlink_port *   (*ndo_get_devlink_port)(struct net_device *dev);
1430 };
1431 
1432 /**
1433  * enum net_device_priv_flags - &struct net_device priv_flags
1434  *
1435  * These are the &struct net_device, they are only set internally
1436  * by drivers and used in the kernel. These flags are invisible to
1437  * userspace; this means that the order of these flags can change
1438  * during any kernel release.
1439  *
1440  * You should have a pretty good reason to be extending these flags.
1441  *
1442  * @IFF_802_1Q_VLAN: 802.1Q VLAN device
1443  * @IFF_EBRIDGE: Ethernet bridging device
1444  * @IFF_BONDING: bonding master or slave
1445  * @IFF_ISATAP: ISATAP interface (RFC4214)
1446  * @IFF_WAN_HDLC: WAN HDLC device
1447  * @IFF_XMIT_DST_RELEASE: dev_hard_start_xmit() is allowed to
1448  *      release skb->dst
1449  * @IFF_DONT_BRIDGE: disallow bridging this ether dev
1450  * @IFF_DISABLE_NETPOLL: disable netpoll at run-time
1451  * @IFF_MACVLAN_PORT: device used as macvlan port
1452  * @IFF_BRIDGE_PORT: device used as bridge port
1453  * @IFF_OVS_DATAPATH: device used as Open vSwitch datapath port
1454  * @IFF_TX_SKB_SHARING: The interface supports sharing skbs on transmit
1455  * @IFF_UNICAST_FLT: Supports unicast filtering
1456  * @IFF_TEAM_PORT: device used as team port
1457  * @IFF_SUPP_NOFCS: device supports sending custom FCS
1458  * @IFF_LIVE_ADDR_CHANGE: device supports hardware address
1459  *      change when it's running
1460  * @IFF_MACVLAN: Macvlan device
1461  * @IFF_XMIT_DST_RELEASE_PERM: IFF_XMIT_DST_RELEASE not taking into account
1462  *      underlying stacked devices
1463  * @IFF_L3MDEV_MASTER: device is an L3 master device
1464  * @IFF_NO_QUEUE: device can run without qdisc attached
1465  * @IFF_OPENVSWITCH: device is a Open vSwitch master
1466  * @IFF_L3MDEV_SLAVE: device is enslaved to an L3 master device
1467  * @IFF_TEAM: device is a team device
1468  * @IFF_RXFH_CONFIGURED: device has had Rx Flow indirection table configured
1469  * @IFF_PHONY_HEADROOM: the headroom value is controlled by an external
1470  *      entity (i.e. the master device for bridged veth)
1471  * @IFF_MACSEC: device is a MACsec device
1472  * @IFF_NO_RX_HANDLER: device doesn't support the rx_handler hook
1473  * @IFF_FAILOVER: device is a failover master device
1474  * @IFF_FAILOVER_SLAVE: device is lower dev of a failover master device
1475  * @IFF_L3MDEV_RX_HANDLER: only invoke the rx handler of L3 master device
1476  * @IFF_LIVE_RENAME_OK: rename is allowed while device is up and running
1477  */
1478 enum netdev_priv_flags {
1479         IFF_802_1Q_VLAN                 = 1<<0,
1480         IFF_EBRIDGE                     = 1<<1,
1481         IFF_BONDING                     = 1<<2,
1482         IFF_ISATAP                      = 1<<3,
1483         IFF_WAN_HDLC                    = 1<<4,
1484         IFF_XMIT_DST_RELEASE            = 1<<5,
1485         IFF_DONT_BRIDGE                 = 1<<6,
1486         IFF_DISABLE_NETPOLL             = 1<<7,
1487         IFF_MACVLAN_PORT                = 1<<8,
1488         IFF_BRIDGE_PORT                 = 1<<9,
1489         IFF_OVS_DATAPATH                = 1<<10,
1490         IFF_TX_SKB_SHARING              = 1<<11,
1491         IFF_UNICAST_FLT                 = 1<<12,
1492         IFF_TEAM_PORT                   = 1<<13,
1493         IFF_SUPP_NOFCS                  = 1<<14,
1494         IFF_LIVE_ADDR_CHANGE            = 1<<15,
1495         IFF_MACVLAN                     = 1<<16,
1496         IFF_XMIT_DST_RELEASE_PERM       = 1<<17,
1497         IFF_L3MDEV_MASTER               = 1<<18,
1498         IFF_NO_QUEUE                    = 1<<19,
1499         IFF_OPENVSWITCH                 = 1<<20,
1500         IFF_L3MDEV_SLAVE                = 1<<21,
1501         IFF_TEAM                        = 1<<22,
1502         IFF_RXFH_CONFIGURED             = 1<<23,
1503         IFF_PHONY_HEADROOM              = 1<<24,
1504         IFF_MACSEC                      = 1<<25,
1505         IFF_NO_RX_HANDLER               = 1<<26,
1506         IFF_FAILOVER                    = 1<<27,
1507         IFF_FAILOVER_SLAVE              = 1<<28,
1508         IFF_L3MDEV_RX_HANDLER           = 1<<29,
1509         IFF_LIVE_RENAME_OK              = 1<<30,
1510 };
1511 
1512 #define IFF_802_1Q_VLAN                 IFF_802_1Q_VLAN
1513 #define IFF_EBRIDGE                     IFF_EBRIDGE
1514 #define IFF_BONDING                     IFF_BONDING
1515 #define IFF_ISATAP                      IFF_ISATAP
1516 #define IFF_WAN_HDLC                    IFF_WAN_HDLC
1517 #define IFF_XMIT_DST_RELEASE            IFF_XMIT_DST_RELEASE
1518 #define IFF_DONT_BRIDGE                 IFF_DONT_BRIDGE
1519 #define IFF_DISABLE_NETPOLL             IFF_DISABLE_NETPOLL
1520 #define IFF_MACVLAN_PORT                IFF_MACVLAN_PORT
1521 #define IFF_BRIDGE_PORT                 IFF_BRIDGE_PORT
1522 #define IFF_OVS_DATAPATH                IFF_OVS_DATAPATH
1523 #define IFF_TX_SKB_SHARING              IFF_TX_SKB_SHARING
1524 #define IFF_UNICAST_FLT                 IFF_UNICAST_FLT
1525 #define IFF_TEAM_PORT                   IFF_TEAM_PORT
1526 #define IFF_SUPP_NOFCS                  IFF_SUPP_NOFCS
1527 #define IFF_LIVE_ADDR_CHANGE            IFF_LIVE_ADDR_CHANGE
1528 #define IFF_MACVLAN                     IFF_MACVLAN
1529 #define IFF_XMIT_DST_RELEASE_PERM       IFF_XMIT_DST_RELEASE_PERM
1530 #define IFF_L3MDEV_MASTER               IFF_L3MDEV_MASTER
1531 #define IFF_NO_QUEUE                    IFF_NO_QUEUE
1532 #define IFF_OPENVSWITCH                 IFF_OPENVSWITCH
1533 #define IFF_L3MDEV_SLAVE                IFF_L3MDEV_SLAVE
1534 #define IFF_TEAM                        IFF_TEAM
1535 #define IFF_RXFH_CONFIGURED             IFF_RXFH_CONFIGURED
1536 #define IFF_MACSEC                      IFF_MACSEC
1537 #define IFF_NO_RX_HANDLER               IFF_NO_RX_HANDLER
1538 #define IFF_FAILOVER                    IFF_FAILOVER
1539 #define IFF_FAILOVER_SLAVE              IFF_FAILOVER_SLAVE
1540 #define IFF_L3MDEV_RX_HANDLER           IFF_L3MDEV_RX_HANDLER
1541 #define IFF_LIVE_RENAME_OK              IFF_LIVE_RENAME_OK
1542 
1543 /**
1544  *      struct net_device - The DEVICE structure.
1545  *
1546  *      Actually, this whole structure is a big mistake.  It mixes I/O
1547  *      data with strictly "high-level" data, and it has to know about
1548  *      almost every data structure used in the INET module.
1549  *
1550  *      @name:  This is the first field of the "visible" part of this structure
1551  *              (i.e. as seen by users in the "Space.c" file).  It is the name
1552  *              of the interface.
1553  *
1554  *      @name_hlist:    Device name hash chain, please keep it close to name[]
1555  *      @ifalias:       SNMP alias
1556  *      @mem_end:       Shared memory end
1557  *      @mem_start:     Shared memory start
1558  *      @base_addr:     Device I/O address
1559  *      @irq:           Device IRQ number
1560  *
1561  *      @state:         Generic network queuing layer state, see netdev_state_t
1562  *      @dev_list:      The global list of network devices
1563  *      @napi_list:     List entry used for polling NAPI devices
1564  *      @unreg_list:    List entry  when we are unregistering the
1565  *                      device; see the function unregister_netdev
1566  *      @close_list:    List entry used when we are closing the device
1567  *      @ptype_all:     Device-specific packet handlers for all protocols
1568  *      @ptype_specific: Device-specific, protocol-specific packet handlers
1569  *
1570  *      @adj_list:      Directly linked devices, like slaves for bonding
1571  *      @features:      Currently active device features
1572  *      @hw_features:   User-changeable features
1573  *
1574  *      @wanted_features:       User-requested features
1575  *      @vlan_features:         Mask of features inheritable by VLAN devices
1576  *
1577  *      @hw_enc_features:       Mask of features inherited by encapsulating devices
1578  *                              This field indicates what encapsulation
1579  *                              offloads the hardware is capable of doing,
1580  *                              and drivers will need to set them appropriately.
1581  *
1582  *      @mpls_features: Mask of features inheritable by MPLS
1583  *
1584  *      @ifindex:       interface index
1585  *      @group:         The group the device belongs to
1586  *
1587  *      @stats:         Statistics struct, which was left as a legacy, use
1588  *                      rtnl_link_stats64 instead
1589  *
1590  *      @rx_dropped:    Dropped packets by core network,
1591  *                      do not use this in drivers
1592  *      @tx_dropped:    Dropped packets by core network,
1593  *                      do not use this in drivers
1594  *      @rx_nohandler:  nohandler dropped packets by core network on
1595  *                      inactive devices, do not use this in drivers
1596  *      @carrier_up_count:      Number of times the carrier has been up
1597  *      @carrier_down_count:    Number of times the carrier has been down
1598  *
1599  *      @wireless_handlers:     List of functions to handle Wireless Extensions,
1600  *                              instead of ioctl,
1601  *                              see <net/iw_handler.h> for details.
1602  *      @wireless_data: Instance data managed by the core of wireless extensions
1603  *
1604  *      @netdev_ops:    Includes several pointers to callbacks,
1605  *                      if one wants to override the ndo_*() functions
1606  *      @ethtool_ops:   Management operations
1607  *      @ndisc_ops:     Includes callbacks for different IPv6 neighbour
1608  *                      discovery handling. Necessary for e.g. 6LoWPAN.
1609  *      @header_ops:    Includes callbacks for creating,parsing,caching,etc
1610  *                      of Layer 2 headers.
1611  *
1612  *      @flags:         Interface flags (a la BSD)
1613  *      @priv_flags:    Like 'flags' but invisible to userspace,
1614  *                      see if.h for the definitions
1615  *      @gflags:        Global flags ( kept as legacy )
1616  *      @padded:        How much padding added by alloc_netdev()
1617  *      @operstate:     RFC2863 operstate
1618  *      @link_mode:     Mapping policy to operstate
1619  *      @if_port:       Selectable AUI, TP, ...
1620  *      @dma:           DMA channel
1621  *      @mtu:           Interface MTU value
1622  *      @min_mtu:       Interface Minimum MTU value
1623  *      @max_mtu:       Interface Maximum MTU value
1624  *      @type:          Interface hardware type
1625  *      @hard_header_len: Maximum hardware header length.
1626  *      @min_header_len:  Minimum hardware header length
1627  *
1628  *      @needed_headroom: Extra headroom the hardware may need, but not in all
1629  *                        cases can this be guaranteed
1630  *      @needed_tailroom: Extra tailroom the hardware may need, but not in all
1631  *                        cases can this be guaranteed. Some cases also use
1632  *                        LL_MAX_HEADER instead to allocate the skb
1633  *
1634  *      interface address info:
1635  *
1636  *      @perm_addr:             Permanent hw address
1637  *      @addr_assign_type:      Hw address assignment type
1638  *      @addr_len:              Hardware address length
1639  *      @neigh_priv_len:        Used in neigh_alloc()
1640  *      @dev_id:                Used to differentiate devices that share
1641  *                              the same link layer address
1642  *      @dev_port:              Used to differentiate devices that share
1643  *                              the same function
1644  *      @addr_list_lock:        XXX: need comments on this one
1645  *      @uc_promisc:            Counter that indicates promiscuous mode
1646  *                              has been enabled due to the need to listen to
1647  *                              additional unicast addresses in a device that
1648  *                              does not implement ndo_set_rx_mode()
1649  *      @uc:                    unicast mac addresses
1650  *      @mc:                    multicast mac addresses
1651  *      @dev_addrs:             list of device hw addresses
1652  *      @queues_kset:           Group of all Kobjects in the Tx and RX queues
1653  *      @promiscuity:           Number of times the NIC is told to work in
1654  *                              promiscuous mode; if it becomes 0 the NIC will
1655  *                              exit promiscuous mode
1656  *      @allmulti:              Counter, enables or disables allmulticast mode
1657  *
1658  *      @vlan_info:     VLAN info
1659  *      @dsa_ptr:       dsa specific data
1660  *      @tipc_ptr:      TIPC specific data
1661  *      @atalk_ptr:     AppleTalk link
1662  *      @ip_ptr:        IPv4 specific data
1663  *      @dn_ptr:        DECnet specific data
1664  *      @ip6_ptr:       IPv6 specific data
1665  *      @ax25_ptr:      AX.25 specific data
1666  *      @ieee80211_ptr: IEEE 802.11 specific data, assign before registering
1667  *
1668  *      @dev_addr:      Hw address (before bcast,
1669  *                      because most packets are unicast)
1670  *
1671  *      @_rx:                   Array of RX queues
1672  *      @num_rx_queues:         Number of RX queues
1673  *                              allocated at register_netdev() time
1674  *      @real_num_rx_queues:    Number of RX queues currently active in device
1675  *
1676  *      @rx_handler:            handler for received packets
1677  *      @rx_handler_data:       XXX: need comments on this one
1678  *      @miniq_ingress:         ingress/clsact qdisc specific data for
1679  *                              ingress processing
1680  *      @ingress_queue:         XXX: need comments on this one
1681  *      @broadcast:             hw bcast address
1682  *
1683  *      @rx_cpu_rmap:   CPU reverse-mapping for RX completion interrupts,
1684  *                      indexed by RX queue number. Assigned by driver.
1685  *                      This must only be set if the ndo_rx_flow_steer
1686  *                      operation is defined
1687  *      @index_hlist:           Device index hash chain
1688  *
1689  *      @_tx:                   Array of TX queues
1690  *      @num_tx_queues:         Number of TX queues allocated at alloc_netdev_mq() time
1691  *      @real_num_tx_queues:    Number of TX queues currently active in device
1692  *      @qdisc:                 Root qdisc from userspace point of view
1693  *      @tx_queue_len:          Max frames per queue allowed
1694  *      @tx_global_lock:        XXX: need comments on this one
1695  *
1696  *      @xps_maps:      XXX: need comments on this one
1697  *      @miniq_egress:          clsact qdisc specific data for
1698  *                              egress processing
1699  *      @watchdog_timeo:        Represents the timeout that is used by
1700  *                              the watchdog (see dev_watchdog())
1701  *      @watchdog_timer:        List of timers
1702  *
1703  *      @pcpu_refcnt:           Number of references to this device
1704  *      @todo_list:             Delayed register/unregister
1705  *      @link_watch_list:       XXX: need comments on this one
1706  *
1707  *      @reg_state:             Register/unregister state machine
1708  *      @dismantle:             Device is going to be freed
1709  *      @rtnl_link_state:       This enum represents the phases of creating
1710  *                              a new link
1711  *
1712  *      @needs_free_netdev:     Should unregister perform free_netdev?
1713  *      @priv_destructor:       Called from unregister
1714  *      @npinfo:                XXX: need comments on this one
1715  *      @nd_net:                Network namespace this network device is inside
1716  *
1717  *      @ml_priv:       Mid-layer private
1718  *      @lstats:        Loopback statistics
1719  *      @tstats:        Tunnel statistics
1720  *      @dstats:        Dummy statistics
1721  *      @vstats:        Virtual ethernet statistics
1722  *
1723  *      @garp_port:     GARP
1724  *      @mrp_port:      MRP
1725  *
1726  *      @dev:           Class/net/name entry
1727  *      @sysfs_groups:  Space for optional device, statistics and wireless
1728  *                      sysfs groups
1729  *
1730  *      @sysfs_rx_queue_group:  Space for optional per-rx queue attributes
1731  *      @rtnl_link_ops: Rtnl_link_ops
1732  *
1733  *      @gso_max_size:  Maximum size of generic segmentation offload
1734  *      @gso_max_segs:  Maximum number of segments that can be passed to the
1735  *                      NIC for GSO
1736  *
1737  *      @dcbnl_ops:     Data Center Bridging netlink ops
1738  *      @num_tc:        Number of traffic classes in the net device
1739  *      @tc_to_txq:     XXX: need comments on this one
1740  *      @prio_tc_map:   XXX: need comments on this one
1741  *
1742  *      @fcoe_ddp_xid:  Max exchange id for FCoE LRO by ddp
1743  *
1744  *      @priomap:       XXX: need comments on this one
1745  *      @phydev:        Physical device may attach itself
1746  *                      for hardware timestamping
1747  *      @sfp_bus:       attached &struct sfp_bus structure.
1748  *
1749  *      @qdisc_tx_busylock: lockdep class annotating Qdisc->busylock spinlock
1750  *      @qdisc_running_key: lockdep class annotating Qdisc->running seqcount
1751  *
1752  *      @proto_down:    protocol port state information can be sent to the
1753  *                      switch driver and used to set the phys state of the
1754  *                      switch port.
1755  *
1756  *      @wol_enabled:   Wake-on-LAN is enabled
1757  *
1758  *      FIXME: cleanup struct net_device such that network protocol info
1759  *      moves out.
1760  */
1761 
1762 struct net_device {
1763         char                    name[IFNAMSIZ];
1764         struct hlist_node       name_hlist;
1765         struct dev_ifalias      __rcu *ifalias;
1766         /*
1767          *      I/O specific fields
1768          *      FIXME: Merge these and struct ifmap into one
1769          */
1770         unsigned long           mem_end;
1771         unsigned long           mem_start;
1772         unsigned long           base_addr;
1773         int                     irq;
1774 
1775         /*
1776          *      Some hardware also needs these fields (state,dev_list,
1777          *      napi_list,unreg_list,close_list) but they are not
1778          *      part of the usual set specified in Space.c.
1779          */
1780 
1781         unsigned long           state;
1782 
1783         struct list_head        dev_list;
1784         struct list_head        napi_list;
1785         struct list_head        unreg_list;
1786         struct list_head        close_list;
1787         struct list_head        ptype_all;
1788         struct list_head        ptype_specific;
1789 
1790         struct {
1791                 struct list_head upper;
1792                 struct list_head lower;
1793         } adj_list;
1794 
1795         netdev_features_t       features;
1796         netdev_features_t       hw_features;
1797         netdev_features_t       wanted_features;
1798         netdev_features_t       vlan_features;
1799         netdev_features_t       hw_enc_features;
1800         netdev_features_t       mpls_features;
1801         netdev_features_t       gso_partial_features;
1802 
1803         int                     ifindex;
1804         int                     group;
1805 
1806         struct net_device_stats stats;
1807 
1808         atomic_long_t           rx_dropped;
1809         atomic_long_t           tx_dropped;
1810         atomic_long_t           rx_nohandler;
1811 
1812         /* Stats to monitor link on/off, flapping */
1813         atomic_t                carrier_up_count;
1814         atomic_t                carrier_down_count;
1815 
1816 #ifdef CONFIG_WIRELESS_EXT
1817         const struct iw_handler_def *wireless_handlers;
1818         struct iw_public_data   *wireless_data;
1819 #endif
1820         const struct net_device_ops *netdev_ops;
1821         const struct ethtool_ops *ethtool_ops;
1822 #ifdef CONFIG_NET_L3_MASTER_DEV
1823         const struct l3mdev_ops *l3mdev_ops;
1824 #endif
1825 #if IS_ENABLED(CONFIG_IPV6)
1826         const struct ndisc_ops *ndisc_ops;
1827 #endif
1828 
1829 #ifdef CONFIG_XFRM_OFFLOAD
1830         const struct xfrmdev_ops *xfrmdev_ops;
1831 #endif
1832 
1833 #if IS_ENABLED(CONFIG_TLS_DEVICE)
1834         const struct tlsdev_ops *tlsdev_ops;
1835 #endif
1836 
1837         const struct header_ops *header_ops;
1838 
1839         unsigned int            flags;
1840         unsigned int            priv_flags;
1841 
1842         unsigned short          gflags;
1843         unsigned short          padded;
1844 
1845         unsigned char           operstate;
1846         unsigned char           link_mode;
1847 
1848         unsigned char           if_port;
1849         unsigned char           dma;
1850 
1851         /* Note : dev->mtu is often read without holding a lock.
1852          * Writers usually hold RTNL.
1853          * It is recommended to use READ_ONCE() to annotate the reads,
1854          * and to use WRITE_ONCE() to annotate the writes.
1855          */
1856         unsigned int            mtu;
1857         unsigned int            min_mtu;
1858         unsigned int            max_mtu;
1859         unsigned short          type;
1860         unsigned short          hard_header_len;
1861         unsigned char           min_header_len;
1862 
1863         unsigned short          needed_headroom;
1864         unsigned short          needed_tailroom;
1865 
1866         /* Interface address info. */
1867         unsigned char           perm_addr[MAX_ADDR_LEN];
1868         unsigned char           addr_assign_type;
1869         unsigned char           addr_len;
1870         unsigned short          neigh_priv_len;
1871         unsigned short          dev_id;
1872         unsigned short          dev_port;
1873         spinlock_t              addr_list_lock;
1874         unsigned char           name_assign_type;
1875         bool                    uc_promisc;
1876         struct netdev_hw_addr_list      uc;
1877         struct netdev_hw_addr_list      mc;
1878         struct netdev_hw_addr_list      dev_addrs;
1879 
1880 #ifdef CONFIG_SYSFS
1881         struct kset             *queues_kset;
1882 #endif
1883         unsigned int            promiscuity;
1884         unsigned int            allmulti;
1885 
1886 
1887         /* Protocol-specific pointers */
1888 
1889 #if IS_ENABLED(CONFIG_VLAN_8021Q)
1890         struct vlan_info __rcu  *vlan_info;
1891 #endif
1892 #if IS_ENABLED(CONFIG_NET_DSA)
1893         struct dsa_port         *dsa_ptr;
1894 #endif
1895 #if IS_ENABLED(CONFIG_TIPC)
1896         struct tipc_bearer __rcu *tipc_ptr;
1897 #endif
1898 #if IS_ENABLED(CONFIG_IRDA) || IS_ENABLED(CONFIG_ATALK)
1899         void                    *atalk_ptr;
1900 #endif
1901         struct in_device __rcu  *ip_ptr;
1902 #if IS_ENABLED(CONFIG_DECNET)
1903         struct dn_dev __rcu     *dn_ptr;
1904 #endif
1905         struct inet6_dev __rcu  *ip6_ptr;
1906 #if IS_ENABLED(CONFIG_AX25)
1907         void                    *ax25_ptr;
1908 #endif
1909         struct wireless_dev     *ieee80211_ptr;
1910         struct wpan_dev         *ieee802154_ptr;
1911 #if IS_ENABLED(CONFIG_MPLS_ROUTING)
1912         struct mpls_dev __rcu   *mpls_ptr;
1913 #endif
1914 
1915 /*
1916  * Cache lines mostly used on receive path (including eth_type_trans())
1917  */
1918         /* Interface address info used in eth_type_trans() */
1919         unsigned char           *dev_addr;
1920 
1921         struct netdev_rx_queue  *_rx;
1922         unsigned int            num_rx_queues;
1923         unsigned int            real_num_rx_queues;
1924 
1925         struct bpf_prog __rcu   *xdp_prog;
1926         unsigned long           gro_flush_timeout;
1927         rx_handler_func_t __rcu *rx_handler;
1928         void __rcu              *rx_handler_data;
1929 
1930 #ifdef CONFIG_NET_CLS_ACT
1931         struct mini_Qdisc __rcu *miniq_ingress;
1932 #endif
1933         struct netdev_queue __rcu *ingress_queue;
1934 #ifdef CONFIG_NETFILTER_INGRESS
1935         struct nf_hook_entries __rcu *nf_hooks_ingress;
1936 #endif
1937 
1938         unsigned char           broadcast[MAX_ADDR_LEN];
1939 #ifdef CONFIG_RFS_ACCEL
1940         struct cpu_rmap         *rx_cpu_rmap;
1941 #endif
1942         struct hlist_node       index_hlist;
1943 
1944 /*
1945  * Cache lines mostly used on transmit path
1946  */
1947         struct netdev_queue     *_tx ____cacheline_aligned_in_smp;
1948         unsigned int            num_tx_queues;
1949         unsigned int            real_num_tx_queues;
1950         struct Qdisc            *qdisc;
1951 #ifdef CONFIG_NET_SCHED
1952         DECLARE_HASHTABLE       (qdisc_hash, 4);
1953 #endif
1954         unsigned int            tx_queue_len;
1955         spinlock_t              tx_global_lock;
1956         int                     watchdog_timeo;
1957 
1958 #ifdef CONFIG_XPS
1959         struct xps_dev_maps __rcu *xps_cpus_map;
1960         struct xps_dev_maps __rcu *xps_rxqs_map;
1961 #endif
1962 #ifdef CONFIG_NET_CLS_ACT
1963         struct mini_Qdisc __rcu *miniq_egress;
1964 #endif
1965 
1966         /* These may be needed for future network-power-down code. */
1967         struct timer_list       watchdog_timer;
1968 
1969         int __percpu            *pcpu_refcnt;
1970         struct list_head        todo_list;
1971 
1972         struct list_head        link_watch_list;
1973 
1974         enum { NETREG_UNINITIALIZED=0,
1975                NETREG_REGISTERED,       /* completed register_netdevice */
1976                NETREG_UNREGISTERING,    /* called unregister_netdevice */
1977                NETREG_UNREGISTERED,     /* completed unregister todo */
1978                NETREG_RELEASED,         /* called free_netdev */
1979                NETREG_DUMMY,            /* dummy device for NAPI poll */
1980         } reg_state:8;
1981 
1982         bool dismantle;
1983 
1984         enum {
1985                 RTNL_LINK_INITIALIZED,
1986                 RTNL_LINK_INITIALIZING,
1987         } rtnl_link_state:16;
1988 
1989         bool needs_free_netdev;
1990         void (*priv_destructor)(struct net_device *dev);
1991 
1992 #ifdef CONFIG_NETPOLL
1993         struct netpoll_info __rcu       *npinfo;
1994 #endif
1995 
1996         possible_net_t                  nd_net;
1997 
1998         /* mid-layer private */
1999         union {
2000                 void                                    *ml_priv;
2001                 struct pcpu_lstats __percpu             *lstats;
2002                 struct pcpu_sw_netstats __percpu        *tstats;
2003                 struct pcpu_dstats __percpu             *dstats;
2004         };
2005 
2006 #if IS_ENABLED(CONFIG_GARP)
2007         struct garp_port __rcu  *garp_port;
2008 #endif
2009 #if IS_ENABLED(CONFIG_MRP)
2010         struct mrp_port __rcu   *mrp_port;
2011 #endif
2012 
2013         struct device           dev;
2014         const struct attribute_group *sysfs_groups[4];
2015         const struct attribute_group *sysfs_rx_queue_group;
2016 
2017         const struct rtnl_link_ops *rtnl_link_ops;
2018 
2019         /* for setting kernel sock attribute on TCP connection setup */
2020 #define GSO_MAX_SIZE            65536
2021         unsigned int            gso_max_size;
2022 #define GSO_MAX_SEGS            65535
2023         u16                     gso_max_segs;
2024 
2025 #ifdef CONFIG_DCB
2026         const struct dcbnl_rtnl_ops *dcbnl_ops;
2027 #endif
2028         s16                     num_tc;
2029         struct netdev_tc_txq    tc_to_txq[TC_MAX_QUEUE];
2030         u8                      prio_tc_map[TC_BITMASK + 1];
2031 
2032 #if IS_ENABLED(CONFIG_FCOE)
2033         unsigned int            fcoe_ddp_xid;
2034 #endif
2035 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
2036         struct netprio_map __rcu *priomap;
2037 #endif
2038         struct phy_device       *phydev;
2039         struct sfp_bus          *sfp_bus;
2040         struct lock_class_key   *qdisc_tx_busylock;
2041         struct lock_class_key   *qdisc_running_key;
2042         bool                    proto_down;
2043         unsigned                wol_enabled:1;
2044 };
2045 #define to_net_dev(d) container_of(d, struct net_device, dev)
2046 
2047 static inline bool netif_elide_gro(const struct net_device *dev)
2048 {
2049         if (!(dev->features & NETIF_F_GRO) || dev->xdp_prog)
2050                 return true;
2051         return false;
2052 }
2053 
2054 #define NETDEV_ALIGN            32
2055 
2056 static inline
2057 int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
2058 {
2059         return dev->prio_tc_map[prio & TC_BITMASK];
2060 }
2061 
2062 static inline
2063 int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc)
2064 {
2065         if (tc >= dev->num_tc)
2066                 return -EINVAL;
2067 
2068         dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK;
2069         return 0;
2070 }
2071 
2072 int netdev_txq_to_tc(struct net_device *dev, unsigned int txq);
2073 void netdev_reset_tc(struct net_device *dev);
2074 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset);
2075 int netdev_set_num_tc(struct net_device *dev, u8 num_tc);
2076 
2077 static inline
2078 int netdev_get_num_tc(struct net_device *dev)
2079 {
2080         return dev->num_tc;
2081 }
2082 
2083 void netdev_unbind_sb_channel(struct net_device *dev,
2084                               struct net_device *sb_dev);
2085 int netdev_bind_sb_channel_queue(struct net_device *dev,
2086                                  struct net_device *sb_dev,
2087                                  u8 tc, u16 count, u16 offset);
2088 int netdev_set_sb_channel(struct net_device *dev, u16 channel);
2089 static inline int netdev_get_sb_channel(struct net_device *dev)
2090 {
2091         return max_t(int, -dev->num_tc, 0);
2092 }
2093 
2094 static inline
2095 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
2096                                          unsigned int index)
2097 {
2098         return &dev->_tx[index];
2099 }
2100 
2101 static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev,
2102                                                     const struct sk_buff *skb)
2103 {
2104         return netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
2105 }
2106 
2107 static inline void netdev_for_each_tx_queue(struct net_device *dev,
2108                                             void (*f)(struct net_device *,
2109                                                       struct netdev_queue *,
2110                                                       void *),
2111                                             void *arg)
2112 {
2113         unsigned int i;
2114 
2115         for (i = 0; i < dev->num_tx_queues; i++)
2116                 f(dev, &dev->_tx[i], arg);
2117 }
2118 
2119 #define netdev_lockdep_set_classes(dev)                         \
2120 {                                                               \
2121         static struct lock_class_key qdisc_tx_busylock_key;     \
2122         static struct lock_class_key qdisc_running_key;         \
2123         static struct lock_class_key qdisc_xmit_lock_key;       \
2124         static struct lock_class_key dev_addr_list_lock_key;    \
2125         unsigned int i;                                         \
2126                                                                 \
2127         (dev)->qdisc_tx_busylock = &qdisc_tx_busylock_key;      \
2128         (dev)->qdisc_running_key = &qdisc_running_key;          \
2129         lockdep_set_class(&(dev)->addr_list_lock,               \
2130                           &dev_addr_list_lock_key);             \
2131         for (i = 0; i < (dev)->num_tx_queues; i++)              \
2132                 lockdep_set_class(&(dev)->_tx[i]._xmit_lock,    \
2133                                   &qdisc_xmit_lock_key);        \
2134 }
2135 
2136 u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb,
2137                      struct net_device *sb_dev);
2138 struct netdev_queue *netdev_core_pick_tx(struct net_device *dev,
2139                                          struct sk_buff *skb,
2140                                          struct net_device *sb_dev);
2141 
2142 /* returns the headroom that the master device needs to take in account
2143  * when forwarding to this dev
2144  */
2145 static inline unsigned netdev_get_fwd_headroom(struct net_device *dev)
2146 {
2147         return dev->priv_flags & IFF_PHONY_HEADROOM ? 0 : dev->needed_headroom;
2148 }
2149 
2150 static inline void netdev_set_rx_headroom(struct net_device *dev, int new_hr)
2151 {
2152         if (dev->netdev_ops->ndo_set_rx_headroom)
2153                 dev->netdev_ops->ndo_set_rx_headroom(dev, new_hr);
2154 }
2155 
2156 /* set the device rx headroom to the dev's default */
2157 static inline void netdev_reset_rx_headroom(struct net_device *dev)
2158 {
2159         netdev_set_rx_headroom(dev, -1);
2160 }
2161 
2162 /*
2163  * Net namespace inlines
2164  */
2165 static inline
2166 struct net *dev_net(const struct net_device *dev)
2167 {
2168         return read_pnet(&dev->nd_net);
2169 }
2170 
2171 static inline
2172 void dev_net_set(struct net_device *dev, struct net *net)
2173 {
2174         write_pnet(&dev->nd_net, net);
2175 }
2176 
2177 /**
2178  *      netdev_priv - access network device private data
2179  *      @dev: network device
2180  *
2181  * Get network device private data
2182  */
2183 static inline void *netdev_priv(const struct net_device *dev)
2184 {
2185         return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
2186 }
2187 
2188 /* Set the sysfs physical device reference for the network logical device
2189  * if set prior to registration will cause a symlink during initialization.
2190  */
2191 #define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))
2192 
2193 /* Set the sysfs device type for the network logical device to allow
2194  * fine-grained identification of different network device types. For
2195  * example Ethernet, Wireless LAN, Bluetooth, WiMAX etc.
2196  */
2197 #define SET_NETDEV_DEVTYPE(net, devtype)        ((net)->dev.type = (devtype))
2198 
2199 /* Default NAPI poll() weight
2200  * Device drivers are strongly advised to not use bigger value
2201  */
2202 #define NAPI_POLL_WEIGHT 64
2203 
2204 /**
2205  *      netif_napi_add - initialize a NAPI context
2206  *      @dev:  network device
2207  *      @napi: NAPI context
2208  *      @poll: polling function
2209  *      @weight: default weight
2210  *
2211  * netif_napi_add() must be used to initialize a NAPI context prior to calling
2212  * *any* of the other NAPI-related functions.
2213  */
2214 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
2215                     int (*poll)(struct napi_struct *, int), int weight);
2216 
2217 /**
2218  *      netif_tx_napi_add - initialize a NAPI context
2219  *      @dev:  network device
2220  *      @napi: NAPI context
2221  *      @poll: polling function
2222  *      @weight: default weight
2223  *
2224  * This variant of netif_napi_add() should be used from drivers using NAPI
2225  * to exclusively poll a TX queue.
2226  * This will avoid we add it into napi_hash[], thus polluting this hash table.
2227  */
2228 static inline void netif_tx_napi_add(struct net_device *dev,
2229                                      struct napi_struct *napi,
2230                                      int (*poll)(struct napi_struct *, int),
2231                                      int weight)
2232 {
2233         set_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state);
2234         netif_napi_add(dev, napi, poll, weight);
2235 }
2236 
2237 /**
2238  *  netif_napi_del - remove a NAPI context
2239  *  @napi: NAPI context
2240  *
2241  *  netif_napi_del() removes a NAPI context from the network device NAPI list
2242  */
2243 void netif_napi_del(struct napi_struct *napi);
2244 
2245 struct napi_gro_cb {
2246         /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
2247         void    *frag0;
2248 
2249         /* Length of frag0. */
2250         unsigned int frag0_len;
2251 
2252         /* This indicates where we are processing relative to skb->data. */
2253         int     data_offset;
2254 
2255         /* This is non-zero if the packet cannot be merged with the new skb. */
2256         u16     flush;
2257 
2258         /* Save the IP ID here and check when we get to the transport layer */
2259         u16     flush_id;
2260 
2261         /* Number of segments aggregated. */
2262         u16     count;
2263 
2264         /* Start offset for remote checksum offload */
2265         u16     gro_remcsum_start;
2266 
2267         /* jiffies when first packet was created/queued */
2268         unsigned long age;
2269 
2270         /* Used in ipv6_gro_receive() and foo-over-udp */
2271         u16     proto;
2272 
2273         /* This is non-zero if the packet may be of the same flow. */
2274         u8      same_flow:1;
2275 
2276         /* Used in tunnel GRO receive */
2277         u8      encap_mark:1;
2278 
2279         /* GRO checksum is valid */
2280         u8      csum_valid:1;
2281 
2282         /* Number of checksums via CHECKSUM_UNNECESSARY */
2283         u8      csum_cnt:3;
2284 
2285         /* Free the skb? */
2286         u8      free:2;
2287 #define NAPI_GRO_FREE             1
2288 #define NAPI_GRO_FREE_STOLEN_HEAD 2
2289 
2290         /* Used in foo-over-udp, set in udp[46]_gro_receive */
2291         u8      is_ipv6:1;
2292 
2293         /* Used in GRE, set in fou/gue_gro_receive */
2294         u8      is_fou:1;
2295 
2296         /* Used to determine if flush_id can be ignored */
2297         u8      is_atomic:1;
2298 
2299         /* Number of gro_receive callbacks this packet already went through */
2300         u8 recursion_counter:4;
2301 
2302         /* 1 bit hole */
2303 
2304         /* used to support CHECKSUM_COMPLETE for tunneling protocols */
2305         __wsum  csum;
2306 
2307         /* used in skb_gro_receive() slow path */
2308         struct sk_buff *last;
2309 };
2310 
2311 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
2312 
2313 #define GRO_RECURSION_LIMIT 15
2314 static inline int gro_recursion_inc_test(struct sk_buff *skb)
2315 {
2316         return ++NAPI_GRO_CB(skb)->recursion_counter == GRO_RECURSION_LIMIT;
2317 }
2318 
2319 typedef struct sk_buff *(*gro_receive_t)(struct list_head *, struct sk_buff *);
2320 static inline struct sk_buff *call_gro_receive(gro_receive_t cb,
2321                                                struct list_head *head,
2322                                                struct sk_buff *skb)
2323 {
2324         if (unlikely(gro_recursion_inc_test(skb))) {
2325                 NAPI_GRO_CB(skb)->flush |= 1;
2326                 return NULL;
2327         }
2328 
2329         return cb(head, skb);
2330 }
2331 
2332 typedef struct sk_buff *(*gro_receive_sk_t)(struct sock *, struct list_head *,
2333                                             struct sk_buff *);
2334 static inline struct sk_buff *call_gro_receive_sk(gro_receive_sk_t cb,
2335                                                   struct sock *sk,
2336                                                   struct list_head *head,
2337                                                   struct sk_buff *skb)
2338 {
2339         if (unlikely(gro_recursion_inc_test(skb))) {
2340                 NAPI_GRO_CB(skb)->flush |= 1;
2341                 return NULL;
2342         }
2343 
2344         return cb(sk, head, skb);
2345 }
2346 
2347 struct packet_type {
2348         __be16                  type;   /* This is really htons(ether_type). */
2349         bool                    ignore_outgoing;
2350         struct net_device       *dev;   /* NULL is wildcarded here           */
2351         int                     (*func) (struct sk_buff *,
2352                                          struct net_device *,
2353                                          struct packet_type *,
2354                                          struct net_device *);
2355         void                    (*list_func) (struct list_head *,
2356                                               struct packet_type *,
2357                                               struct net_device *);
2358         bool                    (*id_match)(struct packet_type *ptype,
2359                                             struct sock *sk);
2360         void                    *af_packet_priv;
2361         struct list_head        list;
2362 };
2363 
2364 struct offload_callbacks {
2365         struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
2366                                                 netdev_features_t features);
2367         struct sk_buff          *(*gro_receive)(struct list_head *head,
2368                                                 struct sk_buff *skb);
2369         int                     (*gro_complete)(struct sk_buff *skb, int nhoff);
2370 };
2371 
2372 struct packet_offload {
2373         __be16                   type;  /* This is really htons(ether_type). */
2374         u16                      priority;
2375         struct offload_callbacks callbacks;
2376         struct list_head         list;
2377 };
2378 
2379 /* often modified stats are per-CPU, other are shared (netdev->stats) */
2380 struct pcpu_sw_netstats {
2381         u64     rx_packets;
2382         u64     rx_bytes;
2383         u64     tx_packets;
2384         u64     tx_bytes;
2385         struct u64_stats_sync   syncp;
2386 } __aligned(4 * sizeof(u64));
2387 
2388 struct pcpu_lstats {
2389         u64 packets;
2390         u64 bytes;
2391         struct u64_stats_sync syncp;
2392 } __aligned(2 * sizeof(u64));
2393 
2394 #define __netdev_alloc_pcpu_stats(type, gfp)                            \
2395 ({                                                                      \
2396         typeof(type) __percpu *pcpu_stats = alloc_percpu_gfp(type, gfp);\
2397         if (pcpu_stats) {                                               \
2398                 int __cpu;                                              \
2399                 for_each_possible_cpu(__cpu) {                          \
2400                         typeof(type) *stat;                             \
2401                         stat = per_cpu_ptr(pcpu_stats, __cpu);          \
2402                         u64_stats_init(&stat->syncp);                   \
2403                 }                                                       \
2404         }                                                               \
2405         pcpu_stats;                                                     \
2406 })
2407 
2408 #define netdev_alloc_pcpu_stats(type)                                   \
2409         __netdev_alloc_pcpu_stats(type, GFP_KERNEL)
2410 
2411 enum netdev_lag_tx_type {
2412         NETDEV_LAG_TX_TYPE_UNKNOWN,
2413         NETDEV_LAG_TX_TYPE_RANDOM,
2414         NETDEV_LAG_TX_TYPE_BROADCAST,
2415         NETDEV_LAG_TX_TYPE_ROUNDROBIN,
2416         NETDEV_LAG_TX_TYPE_ACTIVEBACKUP,
2417         NETDEV_LAG_TX_TYPE_HASH,
2418 };
2419 
2420 enum netdev_lag_hash {
2421         NETDEV_LAG_HASH_NONE,
2422         NETDEV_LAG_HASH_L2,
2423         NETDEV_LAG_HASH_L34,
2424         NETDEV_LAG_HASH_L23,
2425         NETDEV_LAG_HASH_E23,
2426         NETDEV_LAG_HASH_E34,
2427         NETDEV_LAG_HASH_UNKNOWN,
2428 };
2429 
2430 struct netdev_lag_upper_info {
2431         enum netdev_lag_tx_type tx_type;
2432         enum netdev_lag_hash hash_type;
2433 };
2434 
2435 struct netdev_lag_lower_state_info {
2436         u8 link_up : 1,
2437            tx_enabled : 1;
2438 };
2439 
2440 #include <linux/notifier.h>
2441 
2442 /* netdevice notifier chain. Please remember to update netdev_cmd_to_name()
2443  * and the rtnetlink notification exclusion list in rtnetlink_event() when
2444  * adding new types.
2445  */
2446 enum netdev_cmd {
2447         NETDEV_UP       = 1,    /* For now you can't veto a device up/down */
2448         NETDEV_DOWN,
2449         NETDEV_REBOOT,          /* Tell a protocol stack a network interface
2450                                    detected a hardware crash and restarted
2451                                    - we can use this eg to kick tcp sessions
2452                                    once done */
2453         NETDEV_CHANGE,          /* Notify device state change */
2454         NETDEV_REGISTER,
2455         NETDEV_UNREGISTER,
2456         NETDEV_CHANGEMTU,       /* notify after mtu change happened */
2457         NETDEV_CHANGEADDR,      /* notify after the address change */
2458         NETDEV_PRE_CHANGEADDR,  /* notify before the address change */
2459         NETDEV_GOING_DOWN,
2460         NETDEV_CHANGENAME,
2461         NETDEV_FEAT_CHANGE,
2462         NETDEV_BONDING_FAILOVER,
2463         NETDEV_PRE_UP,
2464         NETDEV_PRE_TYPE_CHANGE,
2465         NETDEV_POST_TYPE_CHANGE,
2466         NETDEV_POST_INIT,
2467         NETDEV_RELEASE,
2468         NETDEV_NOTIFY_PEERS,
2469         NETDEV_JOIN,
2470         NETDEV_CHANGEUPPER,
2471         NETDEV_RESEND_IGMP,
2472         NETDEV_PRECHANGEMTU,    /* notify before mtu change happened */
2473         NETDEV_CHANGEINFODATA,
2474         NETDEV_BONDING_INFO,
2475         NETDEV_PRECHANGEUPPER,
2476         NETDEV_CHANGELOWERSTATE,
2477         NETDEV_UDP_TUNNEL_PUSH_INFO,
2478         NETDEV_UDP_TUNNEL_DROP_INFO,
2479         NETDEV_CHANGE_TX_QUEUE_LEN,
2480         NETDEV_CVLAN_FILTER_PUSH_INFO,
2481         NETDEV_CVLAN_FILTER_DROP_INFO,
2482         NETDEV_SVLAN_FILTER_PUSH_INFO,
2483         NETDEV_SVLAN_FILTER_DROP_INFO,
2484 };
2485 const char *netdev_cmd_to_name(enum netdev_cmd cmd);
2486 
2487 int register_netdevice_notifier(struct notifier_block *nb);
2488 int unregister_netdevice_notifier(struct notifier_block *nb);
2489 
2490 struct netdev_notifier_info {
2491         struct net_device       *dev;
2492         struct netlink_ext_ack  *extack;
2493 };
2494 
2495 struct netdev_notifier_info_ext {
2496         struct netdev_notifier_info info; /* must be first */
2497         union {
2498                 u32 mtu;
2499         } ext;
2500 };
2501 
2502 struct netdev_notifier_change_info {
2503         struct netdev_notifier_info info; /* must be first */
2504         unsigned int flags_changed;
2505 };
2506 
2507 struct netdev_notifier_changeupper_info {
2508         struct netdev_notifier_info info; /* must be first */
2509         struct net_device *upper_dev; /* new upper dev */
2510         bool master; /* is upper dev master */
2511         bool linking; /* is the notification for link or unlink */
2512         void *upper_info; /* upper dev info */
2513 };
2514 
2515 struct netdev_notifier_changelowerstate_info {
2516         struct netdev_notifier_info info; /* must be first */
2517         void *lower_state_info; /* is lower dev state */
2518 };
2519 
2520 struct netdev_notifier_pre_changeaddr_info {
2521         struct netdev_notifier_info info; /* must be first */
2522         const unsigned char *dev_addr;
2523 };
2524 
2525 static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
2526                                              struct net_device *dev)
2527 {
2528         info->dev = dev;
2529         info->extack = NULL;
2530 }
2531 
2532 static inline struct net_device *
2533 netdev_notifier_info_to_dev(const struct netdev_notifier_info *info)
2534 {
2535         return info->dev;
2536 }
2537 
2538 static inline struct netlink_ext_ack *
2539 netdev_notifier_info_to_extack(const struct netdev_notifier_info *info)
2540 {
2541         return info->extack;
2542 }
2543 
2544 int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
2545 
2546 
2547 extern rwlock_t                         dev_base_lock;          /* Device list lock */
2548 
2549 #define for_each_netdev(net, d)         \
2550                 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
2551 #define for_each_netdev_reverse(net, d) \
2552                 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
2553 #define for_each_netdev_rcu(net, d)             \
2554                 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
2555 #define for_each_netdev_safe(net, d, n) \
2556                 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
2557 #define for_each_netdev_continue(net, d)                \
2558                 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
2559 #define for_each_netdev_continue_rcu(net, d)            \
2560         list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
2561 #define for_each_netdev_in_bond_rcu(bond, slave)        \
2562                 for_each_netdev_rcu(&init_net, slave)   \
2563                         if (netdev_master_upper_dev_get_rcu(slave) == (bond))
2564 #define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)
2565 
2566 static inline struct net_device *next_net_device(struct net_device *dev)
2567 {
2568         struct list_head *lh;
2569         struct net *net;
2570 
2571         net = dev_net(dev);
2572         lh = dev->dev_list.next;
2573         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
2574 }
2575 
2576 static inline struct net_device *next_net_device_rcu(struct net_device *dev)
2577 {
2578         struct list_head *lh;
2579         struct net *net;
2580 
2581         net = dev_net(dev);
2582         lh = rcu_dereference(list_next_rcu(&dev->dev_list));
2583         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
2584 }
2585 
2586 static inline struct net_device *first_net_device(struct net *net)
2587 {
2588         return list_empty(&net->dev_base_head) ? NULL :
2589                 net_device_entry(net->dev_base_head.next);
2590 }
2591 
2592 static inline struct net_device *first_net_device_rcu(struct net *net)
2593 {
2594         struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head));
2595 
2596         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
2597 }
2598 
2599 int netdev_boot_setup_check(struct net_device *dev);
2600 unsigned long netdev_boot_base(const char *prefix, int unit);
2601 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
2602                                        const char *hwaddr);
2603 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
2604 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
2605 void dev_add_pack(struct packet_type *pt);
2606 void dev_remove_pack(struct packet_type *pt);
2607 void __dev_remove_pack(struct packet_type *pt);
2608 void dev_add_offload(struct packet_offload *po);
2609 void dev_remove_offload(struct packet_offload *po);
2610 
2611 int dev_get_iflink(const struct net_device *dev);
2612 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb);
2613 struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags,
2614                                       unsigned short mask);
2615 struct net_device *dev_get_by_name(struct net *net, const char *name);
2616 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name);
2617 struct net_device *__dev_get_by_name(struct net *net, const char *name);
2618 int dev_alloc_name(struct net_device *dev, const char *name);
2619 int dev_open(struct net_device *dev, struct netlink_ext_ack *extack);
2620 void dev_close(struct net_device *dev);
2621 void dev_close_many(struct list_head *head, bool unlink);
2622 void dev_disable_lro(struct net_device *dev);
2623 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *newskb);
2624 u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb,
2625                      struct net_device *sb_dev);
2626 u16 dev_pick_tx_cpu_id(struct net_device *dev, struct sk_buff *skb,
2627                        struct net_device *sb_dev);
2628 int dev_queue_xmit(struct sk_buff *skb);
2629 int dev_queue_xmit_accel(struct sk_buff *skb, struct net_device *sb_dev);
2630 int dev_direct_xmit(struct sk_buff *skb, u16 queue_id);
2631 int register_netdevice(struct net_device *dev);
2632 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head);
2633 void unregister_netdevice_many(struct list_head *head);
2634 static inline void unregister_netdevice(struct net_device *dev)
2635 {
2636         unregister_netdevice_queue(dev, NULL);
2637 }
2638 
2639 int netdev_refcnt_read(const struct net_device *dev);
2640 void free_netdev(struct net_device *dev);
2641 void netdev_freemem(struct net_device *dev);
2642 void synchronize_net(void);
2643 int init_dummy_netdev(struct net_device *dev);
2644 
2645 struct net_device *dev_get_by_index(struct net *net, int ifindex);
2646 struct net_device *__dev_get_by_index(struct net *net, int ifindex);
2647 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);
2648 struct net_device *dev_get_by_napi_id(unsigned int napi_id);
2649 int netdev_get_name(struct net *net, char *name, int ifindex);
2650 int dev_restart(struct net_device *dev);
2651 int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb);
2652 
2653 static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
2654 {
2655         return NAPI_GRO_CB(skb)->data_offset;
2656 }
2657 
2658 static inline unsigned int skb_gro_len(const struct sk_buff *skb)
2659 {
2660         return skb->len - NAPI_GRO_CB(skb)->data_offset;
2661 }
2662 
2663 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
2664 {
2665         NAPI_GRO_CB(skb)->data_offset += len;
2666 }
2667 
2668 static inline void *skb_gro_header_fast(struct sk_buff *skb,
2669                                         unsigned int offset)
2670 {
2671         return NAPI_GRO_CB(skb)->frag0 + offset;
2672 }
2673 
2674 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
2675 {
2676         return NAPI_GRO_CB(skb)->frag0_len < hlen;
2677 }
2678 
2679 static inline void skb_gro_frag0_invalidate(struct sk_buff *skb)
2680 {
2681         NAPI_GRO_CB(skb)->frag0 = NULL;
2682         NAPI_GRO_CB(skb)->frag0_len = 0;
2683 }
2684 
2685 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
2686                                         unsigned int offset)
2687 {
2688         if (!pskb_may_pull(skb, hlen))
2689                 return NULL;
2690 
2691         skb_gro_frag0_invalidate(skb);
2692         return skb->data + offset;
2693 }
2694 
2695 static inline void *skb_gro_network_header(struct sk_buff *skb)
2696 {
2697         return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
2698                skb_network_offset(skb);
2699 }
2700 
2701 static inline void skb_gro_postpull_rcsum(struct sk_buff *skb,
2702                                         const void *start, unsigned int len)
2703 {
2704         if (NAPI_GRO_CB(skb)->csum_valid)
2705                 NAPI_GRO_CB(skb)->csum = csum_sub(NAPI_GRO_CB(skb)->csum,
2706                                                   csum_partial(start, len, 0));
2707 }
2708 
2709 /* GRO checksum functions. These are logical equivalents of the normal
2710  * checksum functions (in skbuff.h) except that they operate on the GRO
2711  * offsets and fields in sk_buff.
2712  */
2713 
2714 __sum16 __skb_gro_checksum_complete(struct sk_buff *skb);
2715 
2716 static inline bool skb_at_gro_remcsum_start(struct sk_buff *skb)
2717 {
2718         return (NAPI_GRO_CB(skb)->gro_remcsum_start == skb_gro_offset(skb));
2719 }
2720 
2721 static inline bool __skb_gro_checksum_validate_needed(struct sk_buff *skb,
2722                                                       bool zero_okay,
2723                                                       __sum16 check)
2724 {
2725         return ((skb->ip_summed != CHECKSUM_PARTIAL ||
2726                 skb_checksum_start_offset(skb) <
2727                  skb_gro_offset(skb)) &&
2728                 !skb_at_gro_remcsum_start(skb) &&
2729                 NAPI_GRO_CB(skb)->csum_cnt == 0 &&
2730                 (!zero_okay || check));
2731 }
2732 
2733 static inline __sum16 __skb_gro_checksum_validate_complete(struct sk_buff *skb,
2734                                                            __wsum psum)
2735 {
2736         if (NAPI_GRO_CB(skb)->csum_valid &&
2737             !csum_fold(csum_add(psum, NAPI_GRO_CB(skb)->csum)))
2738                 return 0;
2739 
2740         NAPI_GRO_CB(skb)->csum = psum;
2741 
2742         return __skb_gro_checksum_complete(skb);
2743 }
2744 
2745 static inline void skb_gro_incr_csum_unnecessary(struct sk_buff *skb)
2746 {
2747         if (NAPI_GRO_CB(skb)->csum_cnt > 0) {
2748                 /* Consume a checksum from CHECKSUM_UNNECESSARY */
2749                 NAPI_GRO_CB(skb)->csum_cnt--;
2750         } else {
2751                 /* Update skb for CHECKSUM_UNNECESSARY and csum_level when we
2752                  * verified a new top level checksum or an encapsulated one
2753                  * during GRO. This saves work if we fallback to normal path.
2754                  */
2755                 __skb_incr_checksum_unnecessary(skb);
2756         }
2757 }
2758 
2759 #define __skb_gro_checksum_validate(skb, proto, zero_okay, check,       \
2760                                     compute_pseudo)                     \
2761 ({                                                                      \
2762         __sum16 __ret = 0;                                              \
2763         if (__skb_gro_checksum_validate_needed(skb, zero_okay, check))  \
2764                 __ret = __skb_gro_checksum_validate_complete(skb,       \
2765                                 compute_pseudo(skb, proto));            \
2766         if (!__ret)                                                     \
2767                 skb_gro_incr_csum_unnecessary(skb);                     \
2768         __ret;                                                          \
2769 })
2770 
2771 #define skb_gro_checksum_validate(skb, proto, compute_pseudo)           \
2772         __skb_gro_checksum_validate(skb, proto, false, 0, compute_pseudo)
2773 
2774 #define skb_gro_checksum_validate_zero_check(skb, proto, check,         \
2775                                              compute_pseudo)            \
2776         __skb_gro_checksum_validate(skb, proto, true, check, compute_pseudo)
2777 
2778 #define skb_gro_checksum_simple_validate(skb)                           \
2779         __skb_gro_checksum_validate(skb, 0, false, 0, null_compute_pseudo)
2780 
2781 static inline bool __skb_gro_checksum_convert_check(struct sk_buff *skb)
2782 {
2783         return (NAPI_GRO_CB(skb)->csum_cnt == 0 &&
2784                 !NAPI_GRO_CB(skb)->csum_valid);
2785 }
2786 
2787 static inline void __skb_gro_checksum_convert(struct sk_buff *skb,
2788                                               __sum16 check, __wsum pseudo)
2789 {
2790         NAPI_GRO_CB(skb)->csum = ~pseudo;
2791         NAPI_GRO_CB(skb)->csum_valid = 1;
2792 }
2793 
2794 #define skb_gro_checksum_try_convert(skb, proto, check, compute_pseudo) \
2795 do {                                                                    \
2796         if (__skb_gro_checksum_convert_check(skb))                      \
2797                 __skb_gro_checksum_convert(skb, check,                  \
2798                                            compute_pseudo(skb, proto)); \
2799 } while (0)
2800 
2801 struct gro_remcsum {
2802         int offset;
2803         __wsum delta;
2804 };
2805 
2806 static inline void skb_gro_remcsum_init(struct gro_remcsum *grc)
2807 {
2808         grc->offset = 0;
2809         grc->delta = 0;
2810 }
2811 
2812 static inline void *skb_gro_remcsum_process(struct sk_buff *skb, void *ptr,
2813                                             unsigned int off, size_t hdrlen,
2814                                             int start, int offset,
2815                                             struct gro_remcsum *grc,
2816                                             bool nopartial)
2817 {
2818         __wsum delta;
2819         size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start);
2820 
2821         BUG_ON(!NAPI_GRO_CB(skb)->csum_valid);
2822 
2823         if (!nopartial) {
2824                 NAPI_GRO_CB(skb)->gro_remcsum_start = off + hdrlen + start;
2825                 return ptr;
2826         }
2827 
2828         ptr = skb_gro_header_fast(skb, off);
2829         if (skb_gro_header_hard(skb, off + plen)) {
2830                 ptr = skb_gro_header_slow(skb, off + plen, off);
2831                 if (!ptr)
2832                         return NULL;
2833         }
2834 
2835         delta = remcsum_adjust(ptr + hdrlen, NAPI_GRO_CB(skb)->csum,
2836                                start, offset);
2837 
2838         /* Adjust skb->csum since we changed the packet */
2839         NAPI_GRO_CB(skb)->csum = csum_add(NAPI_GRO_CB(skb)->csum, delta);
2840 
2841         grc->offset = off + hdrlen + offset;
2842         grc->delta = delta;
2843 
2844         return ptr;
2845 }
2846 
2847 static inline void skb_gro_remcsum_cleanup(struct sk_buff *skb,
2848                                            struct gro_remcsum *grc)
2849 {
2850         void *ptr;
2851         size_t plen = grc->offset + sizeof(u16);
2852 
2853         if (!grc->delta)
2854                 return;
2855 
2856         ptr = skb_gro_header_fast(skb, grc->offset);
2857         if (skb_gro_header_hard(skb, grc->offset + sizeof(u16))) {
2858                 ptr = skb_gro_header_slow(skb, plen, grc->offset);
2859                 if (!ptr)
2860                         return;
2861         }
2862 
2863         remcsum_unadjust((__sum16 *)ptr, grc->delta);
2864 }
2865 
2866 #ifdef CONFIG_XFRM_OFFLOAD
2867 static inline void skb_gro_flush_final(struct sk_buff *skb, struct sk_buff *pp, int flush)
2868 {
2869         if (PTR_ERR(pp) != -EINPROGRESS)
2870                 NAPI_GRO_CB(skb)->flush |= flush;
2871 }
2872 static inline void skb_gro_flush_final_remcsum(struct sk_buff *skb,
2873                                                struct sk_buff *pp,
2874                                                int flush,
2875                                                struct gro_remcsum *grc)
2876 {
2877         if (PTR_ERR(pp) != -EINPROGRESS) {
2878                 NAPI_GRO_CB(skb)->flush |= flush;
2879                 skb_gro_remcsum_cleanup(skb, grc);
2880                 skb->remcsum_offload = 0;
2881         }
2882 }
2883 #else
2884 static inline void skb_gro_flush_final(struct sk_buff *skb, struct sk_buff *pp, int flush)
2885 {
2886         NAPI_GRO_CB(skb)->flush |= flush;
2887 }
2888 static inline void skb_gro_flush_final_remcsum(struct sk_buff *skb,
2889                                                struct sk_buff *pp,
2890                                                int flush,
2891                                                struct gro_remcsum *grc)
2892 {
2893         NAPI_GRO_CB(skb)->flush |= flush;
2894         skb_gro_remcsum_cleanup(skb, grc);
2895         skb->remcsum_offload = 0;
2896 }
2897 #endif
2898 
2899 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
2900                                   unsigned short type,
2901                                   const void *daddr, const void *saddr,
2902                                   unsigned int len)
2903 {
2904         if (!dev->header_ops || !dev->header_ops->create)
2905                 return 0;
2906 
2907         return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
2908 }
2909 
2910 static inline int dev_parse_header(const struct sk_buff *skb,
2911                                    unsigned char *haddr)
2912 {
2913         const struct net_device *dev = skb->dev;
2914 
2915         if (!dev->header_ops || !dev->header_ops->parse)
2916                 return 0;
2917         return dev->header_ops->parse(skb, haddr);
2918 }
2919 
2920 static inline __be16 dev_parse_header_protocol(const struct sk_buff *skb)
2921 {
2922         const struct net_device *dev = skb->dev;
2923 
2924         if (!dev->header_ops || !dev->header_ops->parse_protocol)
2925                 return 0;
2926         return dev->header_ops->parse_protocol(skb);
2927 }
2928 
2929 /* ll_header must have at least hard_header_len allocated */
2930 static inline bool dev_validate_header(const struct net_device *dev,
2931                                        char *ll_header, int len)
2932 {
2933         if (likely(len >= dev->hard_header_len))
2934                 return true;
2935         if (len < dev->min_header_len)
2936                 return false;
2937 
2938         if (capable(CAP_SYS_RAWIO)) {
2939                 memset(ll_header + len, 0, dev->hard_header_len - len);
2940                 return true;
2941         }
2942 
2943         if (dev->header_ops && dev->header_ops->validate)
2944                 return dev->header_ops->validate(ll_header, len);
2945 
2946         return false;
2947 }
2948 
2949 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr,
2950                            int len, int size);
2951 int register_gifconf(unsigned int family, gifconf_func_t *gifconf);
2952 static inline int unregister_gifconf(unsigned int family)
2953 {
2954         return register_gifconf(family, NULL);
2955 }
2956 
2957 #ifdef CONFIG_NET_FLOW_LIMIT
2958 #define FLOW_LIMIT_HISTORY      (1 << 7)  /* must be ^2 and !overflow buckets */
2959 struct sd_flow_limit {
2960         u64                     count;
2961         unsigned int            num_buckets;
2962         unsigned int            history_head;
2963         u16                     history[FLOW_LIMIT_HISTORY];
2964         u8                      buckets[];
2965 };
2966 
2967 extern int netdev_flow_limit_table_len;
2968 #endif /* CONFIG_NET_FLOW_LIMIT */
2969 
2970 /*
2971  * Incoming packets are placed on per-CPU queues
2972  */
2973 struct softnet_data {
2974         struct list_head        poll_list;
2975         struct sk_buff_head     process_queue;
2976 
2977         /* stats */
2978         unsigned int            processed;
2979         unsigned int            time_squeeze;
2980         unsigned int            received_rps;
2981 #ifdef CONFIG_RPS
2982         struct softnet_data     *rps_ipi_list;
2983 #endif
2984 #ifdef CONFIG_NET_FLOW_LIMIT
2985         struct sd_flow_limit __rcu *flow_limit;
2986 #endif
2987         struct Qdisc            *output_queue;
2988         struct Qdisc            **output_queue_tailp;
2989         struct sk_buff          *completion_queue;
2990 #ifdef CONFIG_XFRM_OFFLOAD
2991         struct sk_buff_head     xfrm_backlog;
2992 #endif
2993         /* written and read only by owning cpu: */
2994         struct {
2995                 u16 recursion;
2996                 u8  more;
2997         } xmit;
2998 #ifdef CONFIG_RPS
2999         /* input_queue_head should be written by cpu owning this struct,
3000          * and only read by other cpus. Worth using a cache line.
3001          */
3002         unsigned int            input_queue_head ____cacheline_aligned_in_smp;
3003 
3004         /* Elements below can be accessed between CPUs for RPS/RFS */
3005         call_single_data_t      csd ____cacheline_aligned_in_smp;
3006         struct softnet_data     *rps_ipi_next;
3007         unsigned int            cpu;
3008         unsigned int            input_queue_tail;
3009 #endif
3010         unsigned int            dropped;
3011         struct sk_buff_head     input_pkt_queue;
3012         struct napi_struct      backlog;
3013 
3014 };
3015 
3016 static inline void input_queue_head_incr(struct softnet_data *sd)
3017 {
3018 #ifdef CONFIG_RPS
3019         sd->input_queue_head++;
3020 #endif
3021 }
3022 
3023 static inline void input_queue_tail_incr_save(struct softnet_data *sd,
3024                                               unsigned int *qtail)
3025 {
3026 #ifdef CONFIG_RPS
3027         *qtail = ++sd->input_queue_tail;
3028 #endif
3029 }
3030 
3031 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
3032 
3033 static inline int dev_recursion_level(void)
3034 {
3035         return this_cpu_read(softnet_data.xmit.recursion);
3036 }
3037 
3038 #define XMIT_RECURSION_LIMIT    10
3039 static inline bool dev_xmit_recursion(void)
3040 {
3041         return unlikely(__this_cpu_read(softnet_data.xmit.recursion) >
3042                         XMIT_RECURSION_LIMIT);
3043 }
3044 
3045 static inline void dev_xmit_recursion_inc(void)
3046 {
3047         __this_cpu_inc(softnet_data.xmit.recursion);
3048 }
3049 
3050 static inline void dev_xmit_recursion_dec(void)
3051 {
3052         __this_cpu_dec(softnet_data.xmit.recursion);
3053 }
3054 
3055 void __netif_schedule(struct Qdisc *q);
3056 void netif_schedule_queue(struct netdev_queue *txq);
3057 
3058 static inline void netif_tx_schedule_all(struct net_device *dev)
3059 {
3060         unsigned int i;
3061 
3062         for (i = 0; i < dev->num_tx_queues; i++)
3063                 netif_schedule_queue(netdev_get_tx_queue(dev, i));
3064 }
3065 
3066 static __always_inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
3067 {
3068         clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
3069 }
3070 
3071 /**
3072  *      netif_start_queue - allow transmit
3073  *      @dev: network device
3074  *
3075  *      Allow upper layers to call the device hard_start_xmit routine.
3076  */
3077 static inline void netif_start_queue(struct net_device *dev)
3078 {
3079         netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
3080 }
3081 
3082 static inline void netif_tx_start_all_queues(struct net_device *dev)
3083 {
3084         unsigned int i;
3085 
3086         for (i = 0; i < dev->num_tx_queues; i++) {
3087                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3088                 netif_tx_start_queue(txq);
3089         }
3090 }
3091 
3092 void netif_tx_wake_queue(struct netdev_queue *dev_queue);
3093 
3094 /**
3095  *      netif_wake_queue - restart transmit
3096  *      @dev: network device
3097  *
3098  *      Allow upper layers to call the device hard_start_xmit routine.
3099  *      Used for flow control when transmit resources are available.
3100  */
3101 static inline void netif_wake_queue(struct net_device *dev)
3102 {
3103         netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
3104 }
3105 
3106 static inline void netif_tx_wake_all_queues(struct net_device *dev)
3107 {
3108         unsigned int i;
3109 
3110         for (i = 0; i < dev->num_tx_queues; i++) {
3111                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3112                 netif_tx_wake_queue(txq);
3113         }
3114 }
3115 
3116 static __always_inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
3117 {
3118         set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
3119 }
3120 
3121 /**
3122  *      netif_stop_queue - stop transmitted packets
3123  *      @dev: network device
3124  *
3125  *      Stop upper layers calling the device hard_start_xmit routine.
3126  *      Used for flow control when transmit resources are unavailable.
3127  */
3128 static inline void netif_stop_queue(struct net_device *dev)
3129 {
3130         netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
3131 }
3132 
3133 void netif_tx_stop_all_queues(struct net_device *dev);
3134 
3135 static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
3136 {
3137         return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
3138 }
3139 
3140 /**
3141  *      netif_queue_stopped - test if transmit queue is flowblocked
3142  *      @dev: network device
3143  *
3144  *      Test if transmit queue on device is currently unable to send.
3145  */
3146 static inline bool netif_queue_stopped(const struct net_device *dev)
3147 {
3148         return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
3149 }
3150 
3151 static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
3152 {
3153         return dev_queue->state & QUEUE_STATE_ANY_XOFF;
3154 }
3155 
3156 static inline bool
3157 netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
3158 {
3159         return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
3160 }
3161 
3162 static inline bool
3163 netif_xmit_frozen_or_drv_stopped(const struct netdev_queue *dev_queue)
3164 {
3165         return dev_queue->state & QUEUE_STATE_DRV_XOFF_OR_FROZEN;
3166 }
3167 
3168 /**
3169  *      netdev_txq_bql_enqueue_prefetchw - prefetch bql data for write
3170  *      @dev_queue: pointer to transmit queue
3171  *
3172  * BQL enabled drivers might use this helper in their ndo_start_xmit(),
3173  * to give appropriate hint to the CPU.
3174  */
3175 static inline void netdev_txq_bql_enqueue_prefetchw(struct netdev_queue *dev_queue)
3176 {
3177 #ifdef CONFIG_BQL
3178         prefetchw(&dev_queue->dql.num_queued);
3179 #endif
3180 }
3181 
3182 /**
3183  *      netdev_txq_bql_complete_prefetchw - prefetch bql data for write
3184  *      @dev_queue: pointer to transmit queue
3185  *
3186  * BQL enabled drivers might use this helper in their TX completion path,
3187  * to give appropriate hint to the CPU.
3188  */
3189 static inline void netdev_txq_bql_complete_prefetchw(struct netdev_queue *dev_queue)
3190 {
3191 #ifdef CONFIG_BQL
3192         prefetchw(&dev_queue->dql.limit);
3193 #endif
3194 }
3195 
3196 static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
3197                                         unsigned int bytes)
3198 {
3199 #ifdef CONFIG_BQL
3200         dql_queued(&dev_queue->dql, bytes);
3201 
3202         if (likely(dql_avail(&dev_queue->dql) >= 0))
3203                 return;
3204 
3205         set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
3206 
3207         /*
3208          * The XOFF flag must be set before checking the dql_avail below,
3209          * because in netdev_tx_completed_queue we update the dql_completed
3210          * before checking the XOFF flag.
3211          */
3212         smp_mb();
3213 
3214         /* check again in case another CPU has just made room avail */
3215         if (unlikely(dql_avail(&dev_queue->dql) >= 0))
3216                 clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
3217 #endif
3218 }
3219 
3220 /* Variant of netdev_tx_sent_queue() for drivers that are aware
3221  * that they should not test BQL status themselves.
3222  * We do want to change __QUEUE_STATE_STACK_XOFF only for the last
3223  * skb of a batch.
3224  * Returns true if the doorbell must be used to kick the NIC.
3225  */
3226 static inline bool __netdev_tx_sent_queue(struct netdev_queue *dev_queue,
3227                                           unsigned int bytes,
3228                                           bool xmit_more)
3229 {
3230         if (xmit_more) {
3231 #ifdef CONFIG_BQL
3232                 dql_queued(&dev_queue->dql, bytes);
3233 #endif
3234                 return netif_tx_queue_stopped(dev_queue);
3235         }
3236         netdev_tx_sent_queue(dev_queue, bytes);
3237         return true;
3238 }
3239 
3240 /**
3241  *      netdev_sent_queue - report the number of bytes queued to hardware
3242  *      @dev: network device
3243  *      @bytes: number of bytes queued to the hardware device queue
3244  *
3245  *      Report the number of bytes queued for sending/completion to the network
3246  *      device hardware queue. @bytes should be a good approximation and should
3247  *      exactly match netdev_completed_queue() @bytes
3248  */
3249 static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes)
3250 {
3251         netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes);
3252 }
3253 
3254 static inline bool __netdev_sent_queue(struct net_device *dev,
3255                                        unsigned int bytes,
3256                                        bool xmit_more)
3257 {
3258         return __netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes,
3259                                       xmit_more);
3260 }
3261 
3262 static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue,
3263                                              unsigned int pkts, unsigned int bytes)
3264 {
3265 #ifdef CONFIG_BQL
3266         if (unlikely(!bytes))
3267                 return;
3268 
3269         dql_completed(&dev_queue->dql, bytes);
3270 
3271         /*
3272          * Without the memory barrier there is a small possiblity that
3273          * netdev_tx_sent_queue will miss the update and cause the queue to
3274          * be stopped forever
3275          */
3276         smp_mb();
3277 
3278         if (dql_avail(&dev_queue->dql) < 0)
3279                 return;
3280 
3281         if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state))
3282                 netif_schedule_queue(dev_queue);
3283 #endif
3284 }
3285 
3286 /**
3287  *      netdev_completed_queue - report bytes and packets completed by device
3288  *      @dev: network device
3289  *      @pkts: actual number of packets sent over the medium
3290  *      @bytes: actual number of bytes sent over the medium
3291  *
3292  *      Report the number of bytes and packets transmitted by the network device
3293  *      hardware queue over the physical medium, @bytes must exactly match the
3294  *      @bytes amount passed to netdev_sent_queue()
3295  */
3296 static inline void netdev_completed_queue(struct net_device *dev,
3297                                           unsigned int pkts, unsigned int bytes)
3298 {
3299         netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes);
3300 }
3301 
3302 static inline void netdev_tx_reset_queue(struct netdev_queue *q)
3303 {
3304 #ifdef CONFIG_BQL
3305         clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
3306         dql_reset(&q->dql);
3307 #endif
3308 }
3309 
3310 /**
3311  *      netdev_reset_queue - reset the packets and bytes count of a network device
3312  *      @dev_queue: network device
3313  *
3314  *      Reset the bytes and packet count of a network device and clear the
3315  *      software flow control OFF bit for this network device
3316  */
3317 static inline void netdev_reset_queue(struct net_device *dev_queue)
3318 {
3319         netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
3320 }
3321 
3322 /**
3323  *      netdev_cap_txqueue - check if selected tx queue exceeds device queues
3324  *      @dev: network device
3325  *      @queue_index: given tx queue index
3326  *
3327  *      Returns 0 if given tx queue index >= number of device tx queues,
3328  *      otherwise returns the originally passed tx queue index.
3329  */
3330 static inline u16 netdev_cap_txqueue(struct net_device *dev, u16 queue_index)
3331 {
3332         if (unlikely(queue_index >= dev->real_num_tx_queues)) {
3333                 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
3334                                      dev->name, queue_index,
3335                                      dev->real_num_tx_queues);
3336                 return 0;
3337         }
3338 
3339         return queue_index;
3340 }
3341 
3342 /**
3343  *      netif_running - test if up
3344  *      @dev: network device
3345  *
3346  *      Test if the device has been brought up.
3347  */
3348 static inline bool netif_running(const struct net_device *dev)
3349 {
3350         return test_bit(__LINK_STATE_START, &dev->state);
3351 }
3352 
3353 /*
3354  * Routines to manage the subqueues on a device.  We only need start,
3355  * stop, and a check if it's stopped.  All other device management is
3356  * done at the overall netdevice level.
3357  * Also test the device if we're multiqueue.
3358  */
3359 
3360 /**
3361  *      netif_start_subqueue - allow sending packets on subqueue
3362  *      @dev: network device
3363  *      @queue_index: sub queue index
3364  *
3365  * Start individual transmit queue of a device with multiple transmit queues.
3366  */
3367 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
3368 {
3369         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3370 
3371         netif_tx_start_queue(txq);
3372 }
3373 
3374 /**
3375  *      netif_stop_subqueue - stop sending packets on subqueue
3376  *      @dev: network device
3377  *      @queue_index: sub queue index
3378  *
3379  * Stop individual transmit queue of a device with multiple transmit queues.
3380  */
3381 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
3382 {
3383         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3384         netif_tx_stop_queue(txq);
3385 }
3386 
3387 /**
3388  *      netif_subqueue_stopped - test status of subqueue
3389  *      @dev: network device
3390  *      @queue_index: sub queue index
3391  *
3392  * Check individual transmit queue of a device with multiple transmit queues.
3393  */
3394 static inline bool __netif_subqueue_stopped(const struct net_device *dev,
3395                                             u16 queue_index)
3396 {
3397         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3398 
3399         return netif_tx_queue_stopped(txq);
3400 }
3401 
3402 static inline bool netif_subqueue_stopped(const struct net_device *dev,
3403                                           struct sk_buff *skb)
3404 {
3405         return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
3406 }
3407 
3408 /**
3409  *      netif_wake_subqueue - allow sending packets on subqueue
3410  *      @dev: network device
3411  *      @queue_index: sub queue index
3412  *
3413  * Resume individual transmit queue of a device with multiple transmit queues.
3414  */
3415 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
3416 {
3417         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3418 
3419         netif_tx_wake_queue(txq);
3420 }
3421 
3422 #ifdef CONFIG_XPS
3423 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
3424                         u16 index);
3425 int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
3426                           u16 index, bool is_rxqs_map);
3427 
3428 /**
3429  *      netif_attr_test_mask - Test a CPU or Rx queue set in a mask
3430  *      @j: CPU/Rx queue index
3431  *      @mask: bitmask of all cpus/rx queues
3432  *      @nr_bits: number of bits in the bitmask
3433  *
3434  * Test if a CPU or Rx queue index is set in a mask of all CPU/Rx queues.
3435  */
3436 static inline bool netif_attr_test_mask(unsigned long j,
3437                                         const unsigned long *mask,
3438                                         unsigned int nr_bits)
3439 {
3440         cpu_max_bits_warn(j, nr_bits);
3441         return test_bit(j, mask);
3442 }
3443 
3444 /**
3445  *      netif_attr_test_online - Test for online CPU/Rx queue
3446  *      @j: CPU/Rx queue index
3447  *      @online_mask: bitmask for CPUs/Rx queues that are online
3448  *      @nr_bits: number of bits in the bitmask
3449  *
3450  * Returns true if a CPU/Rx queue is online.
3451  */
3452 static inline bool netif_attr_test_online(unsigned long j,
3453                                           const unsigned long *online_mask,
3454                                           unsigned int nr_bits)
3455 {
3456         cpu_max_bits_warn(j, nr_bits);
3457 
3458         if (online_mask)
3459                 return test_bit(j, online_mask);
3460 
3461         return (j < nr_bits);
3462 }
3463 
3464 /**
3465  *      netif_attrmask_next - get the next CPU/Rx queue in a cpu/Rx queues mask
3466  *      @n: CPU/Rx queue index
3467  *      @srcp: the cpumask/Rx queue mask pointer
3468  *      @nr_bits: number of bits in the bitmask
3469  *
3470  * Returns >= nr_bits if no further CPUs/Rx queues set.
3471  */
3472 static inline unsigned int netif_attrmask_next(int n, const unsigned long *srcp,
3473                                                unsigned int nr_bits)
3474 {
3475         /* -1 is a legal arg here. */
3476         if (n != -1)
3477                 cpu_max_bits_warn(n, nr_bits);
3478 
3479         if (srcp)
3480                 return find_next_bit(srcp, nr_bits, n + 1);
3481 
3482         return n + 1;
3483 }
3484 
3485 /**
3486  *      netif_attrmask_next_and - get the next CPU/Rx queue in *src1p & *src2p
3487  *      @n: CPU/Rx queue index
3488  *      @src1p: the first CPUs/Rx queues mask pointer
3489  *      @src2p: the second CPUs/Rx queues mask pointer
3490  *      @nr_bits: number of bits in the bitmask
3491  *
3492  * Returns >= nr_bits if no further CPUs/Rx queues set in both.
3493  */
3494 static inline int netif_attrmask_next_and(int n, const unsigned long *src1p,
3495                                           const unsigned long *src2p,
3496                                           unsigned int nr_bits)
3497 {
3498         /* -1 is a legal arg here. */
3499         if (n != -1)
3500                 cpu_max_bits_warn(n, nr_bits);
3501 
3502         if (src1p && src2p)
3503                 return find_next_and_bit(src1p, src2p, nr_bits, n + 1);
3504         else if (src1p)
3505                 return find_next_bit(src1p, nr_bits, n + 1);
3506         else if (src2p)
3507                 return find_next_bit(src2p, nr_bits, n + 1);
3508 
3509         return n + 1;
3510 }
3511 #else
3512 static inline int netif_set_xps_queue(struct net_device *dev,
3513                                       const struct cpumask *mask,
3514                                       u16 index)
3515 {
3516         return 0;
3517 }
3518 
3519 static inline int __netif_set_xps_queue(struct net_device *dev,
3520                                         const unsigned long *mask,
3521                                         u16 index, bool is_rxqs_map)
3522 {
3523         return 0;
3524 }
3525 #endif
3526 
3527 /**
3528  *      netif_is_multiqueue - test if device has multiple transmit queues
3529  *      @dev: network device
3530  *
3531  * Check if device has multiple transmit queues
3532  */
3533 static inline bool netif_is_multiqueue(const struct net_device *dev)
3534 {
3535         return dev->num_tx_queues > 1;
3536 }
3537 
3538 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq);
3539 
3540 #ifdef CONFIG_SYSFS
3541 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq);
3542 #else
3543 static inline int netif_set_real_num_rx_queues(struct net_device *dev,
3544                                                 unsigned int rxqs)
3545 {
3546         dev->real_num_rx_queues = rxqs;
3547         return 0;
3548 }
3549 #endif
3550 
3551 static inline struct netdev_rx_queue *
3552 __netif_get_rx_queue(struct net_device *dev, unsigned int rxq)
3553 {
3554         return dev->_rx + rxq;
3555 }
3556 
3557 #ifdef CONFIG_SYSFS
3558 static inline unsigned int get_netdev_rx_queue_index(
3559                 struct netdev_rx_queue *queue)
3560 {
3561         struct net_device *dev = queue->dev;
3562         int index = queue - dev->_rx;
3563 
3564         BUG_ON(index >= dev->num_rx_queues);
3565         return index;
3566 }
3567 #endif
3568 
3569 #define DEFAULT_MAX_NUM_RSS_QUEUES      (8)
3570 int netif_get_num_default_rss_queues(void);
3571 
3572 enum skb_free_reason {
3573         SKB_REASON_CONSUMED,
3574         SKB_REASON_DROPPED,
3575 };
3576 
3577 void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason);
3578 void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason);
3579 
3580 /*
3581  * It is not allowed to call kfree_skb() or consume_skb() from hardware
3582  * interrupt context or with hardware interrupts being disabled.
3583  * (in_irq() || irqs_disabled())
3584  *
3585  * We provide four helpers that can be used in following contexts :
3586  *
3587  * dev_kfree_skb_irq(skb) when caller drops a packet from irq context,
3588  *  replacing kfree_skb(skb)
3589  *
3590  * dev_consume_skb_irq(skb) when caller consumes a packet from irq context.
3591  *  Typically used in place of consume_skb(skb) in TX completion path
3592  *
3593  * dev_kfree_skb_any(skb) when caller doesn't know its current irq context,
3594  *  replacing kfree_skb(skb)
3595  *
3596  * dev_consume_skb_any(skb) when caller doesn't know its current irq context,
3597  *  and consumed a packet. Used in place of consume_skb(skb)
3598  */
3599 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
3600 {
3601         __dev_kfree_skb_irq(skb, SKB_REASON_DROPPED);
3602 }
3603 
3604 static inline void dev_consume_skb_irq(struct sk_buff *skb)
3605 {
3606         __dev_kfree_skb_irq(skb, SKB_REASON_CONSUMED);
3607 }
3608 
3609 static inline void dev_kfree_skb_any(struct sk_buff *skb)
3610 {
3611         __dev_kfree_skb_any(skb, SKB_REASON_DROPPED);
3612 }
3613 
3614 static inline void dev_consume_skb_any(struct sk_buff *skb)
3615 {
3616         __dev_kfree_skb_any(skb, SKB_REASON_CONSUMED);
3617 }
3618 
3619 void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog);
3620 int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb);
3621 int netif_rx(struct sk_buff *skb);
3622 int netif_rx_ni(struct sk_buff *skb);
3623 int netif_receive_skb(struct sk_buff *skb);
3624 int netif_receive_skb_core(struct sk_buff *skb);
3625 void netif_receive_skb_list(struct list_head *head);
3626 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb);
3627 void napi_gro_flush(struct napi_struct *napi, bool flush_old);
3628 struct sk_buff *napi_get_frags(struct napi_struct *napi);
3629 gro_result_t napi_gro_frags(struct napi_struct *napi);
3630 struct packet_offload *gro_find_receive_by_type(__be16 type);
3631 struct packet_offload *gro_find_complete_by_type(__be16 type);
3632 
3633 static inline void napi_free_frags(struct napi_struct *napi)
3634 {
3635         kfree_skb(napi->skb);
3636         napi->skb = NULL;
3637 }
3638 
3639 bool netdev_is_rx_handler_busy(struct net_device *dev);
3640 int netdev_rx_handler_register(struct net_device *dev,
3641                                rx_handler_func_t *rx_handler,
3642                                void *rx_handler_data);
3643 void netdev_rx_handler_unregister(struct net_device *dev);
3644 
3645 bool dev_valid_name(const char *name);
3646 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
3647                 bool *need_copyout);
3648 int dev_ifconf(struct net *net, struct ifconf *, int);
3649 int dev_ethtool(struct net *net, struct ifreq *);
3650 unsigned int dev_get_flags(const struct net_device *);
3651 int __dev_change_flags(struct net_device *dev, unsigned int flags,
3652                        struct netlink_ext_ack *extack);
3653 int dev_change_flags(struct net_device *dev, unsigned int flags,
3654                      struct netlink_ext_ack *extack);
3655 void __dev_notify_flags(struct net_device *, unsigned int old_flags,
3656                         unsigned int gchanges);
3657 int dev_change_name(struct net_device *, const char *);
3658 int dev_set_alias(struct net_device *, const char *, size_t);
3659 int dev_get_alias(const struct net_device *, char *, size_t);
3660 int dev_change_net_namespace(struct net_device *, struct net *, const char *);
3661 int __dev_set_mtu(struct net_device *, int);
3662 int dev_set_mtu_ext(struct net_device *dev, int mtu,
3663                     struct netlink_ext_ack *extack);
3664 int dev_set_mtu(struct net_device *, int);
3665 int dev_change_tx_queue_len(struct net_device *, unsigned long);
3666 void dev_set_group(struct net_device *, int);
3667 int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr,
3668                               struct netlink_ext_ack *extack);
3669 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
3670                         struct netlink_ext_ack *extack);
3671 int dev_change_carrier(struct net_device *, bool new_carrier);
3672 int dev_get_phys_port_id(struct net_device *dev,
3673                          struct netdev_phys_item_id *ppid);
3674 int dev_get_phys_port_name(struct net_device *dev,
3675                            char *name, size_t len);
3676 int dev_get_port_parent_id(struct net_device *dev,
3677                            struct netdev_phys_item_id *ppid, bool recurse);
3678 bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b);
3679 int dev_change_proto_down(struct net_device *dev, bool proto_down);
3680 int dev_change_proto_down_generic(struct net_device *dev, bool proto_down);
3681 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again);
3682 struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
3683                                     struct netdev_queue *txq, int *ret);
3684 
3685 typedef int (*bpf_op_t)(struct net_device *dev, struct netdev_bpf *bpf);
3686 int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
3687                       int fd, u32 flags);
3688 u32 __dev_xdp_query(struct net_device *dev, bpf_op_t xdp_op,
3689                     enum bpf_netdev_command cmd);
3690 int xdp_umem_query(struct net_device *dev, u16 queue_id);
3691 
3692 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
3693 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
3694 bool is_skb_forwardable(const struct net_device *dev,
3695                         const struct sk_buff *skb);
3696 
3697 static __always_inline int ____dev_forward_skb(struct net_device *dev,
3698                                                struct sk_buff *skb)
3699 {
3700         if (skb_orphan_frags(skb, GFP_ATOMIC) ||
3701             unlikely(!is_skb_forwardable(dev, skb))) {
3702                 atomic_long_inc(&dev->rx_dropped);
3703                 kfree_skb(skb);
3704                 return NET_RX_DROP;
3705         }
3706 
3707         skb_scrub_packet(skb, true);
3708         skb->priority = 0;
3709         return 0;
3710 }
3711 
3712 bool dev_nit_active(struct net_device *dev);
3713 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
3714 
3715 extern int              netdev_budget;
3716 extern unsigned int     netdev_budget_usecs;
3717 
3718 /* Called by rtnetlink.c:rtnl_unlock() */
3719 void netdev_run_todo(void);
3720 
3721 /**
3722  *      dev_put - release reference to device
3723  *      @dev: network device
3724  *
3725  * Release reference to device to allow it to be freed.
3726  */
3727 static inline void dev_put(struct net_device *dev)
3728 {
3729         this_cpu_dec(*dev->pcpu_refcnt);
3730 }
3731 
3732 /**
3733  *      dev_hold - get reference to device
3734  *      @dev: network device
3735  *
3736  * Hold reference to device to keep it from being freed.
3737  */
3738 static inline void dev_hold(struct net_device *dev)
3739 {
3740         this_cpu_inc(*dev->pcpu_refcnt);
3741 }
3742 
3743 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
3744  * and _off may be called from IRQ context, but it is caller
3745  * who is responsible for serialization of these calls.
3746  *
3747  * The name carrier is inappropriate, these functions should really be
3748  * called netif_lowerlayer_*() because they represent the state of any
3749  * kind of lower layer not just hardware media.
3750  */
3751 
3752 void linkwatch_init_dev(struct net_device *dev);
3753 void linkwatch_fire_event(struct net_device *dev);
3754 void linkwatch_forget_dev(struct net_device *dev);
3755 
3756 /**
3757  *      netif_carrier_ok - test if carrier present
3758  *      @dev: network device
3759  *
3760  * Check if carrier is present on device
3761  */
3762 static inline bool netif_carrier_ok(const struct net_device *dev)
3763 {
3764         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
3765 }
3766 
3767 unsigned long dev_trans_start(struct net_device *dev);
3768 
3769 void __netdev_watchdog_up(struct net_device *dev);
3770 
3771 void netif_carrier_on(struct net_device *dev);
3772 
3773 void netif_carrier_off(struct net_device *dev);
3774 
3775 /**
3776  *      netif_dormant_on - mark device as dormant.
3777  *      @dev: network device
3778  *
3779  * Mark device as dormant (as per RFC2863).
3780  *
3781  * The dormant state indicates that the relevant interface is not
3782  * actually in a condition to pass packets (i.e., it is not 'up') but is
3783  * in a "pending" state, waiting for some external event.  For "on-
3784  * demand" interfaces, this new state identifies the situation where the
3785  * interface is waiting for events to place it in the up state.
3786  */
3787 static inline void netif_dormant_on(struct net_device *dev)
3788 {
3789         if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
3790                 linkwatch_fire_event(dev);
3791 }
3792 
3793 /**
3794  *      netif_dormant_off - set device as not dormant.
3795  *      @dev: network device
3796  *
3797  * Device is not in dormant state.
3798  */
3799 static inline void netif_dormant_off(struct net_device *dev)
3800 {
3801         if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
3802                 linkwatch_fire_event(dev);
3803 }
3804 
3805 /**
3806  *      netif_dormant - test if device is dormant
3807  *      @dev: network device
3808  *
3809  * Check if device is dormant.
3810  */
3811 static inline bool netif_dormant(const struct net_device *dev)
3812 {
3813         return test_bit(__LINK_STATE_DORMANT, &dev->state);
3814 }
3815 
3816 
3817 /**
3818  *      netif_oper_up - test if device is operational
3819  *      @dev: network device
3820  *
3821  * Check if carrier is operational
3822  */
3823 static inline bool netif_oper_up(const struct net_device *dev)
3824 {
3825         return (dev->operstate == IF_OPER_UP ||
3826                 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
3827 }
3828 
3829 /**
3830  *      netif_device_present - is device available or removed
3831  *      @dev: network device
3832  *
3833  * Check if device has not been removed from system.
3834  */
3835 static inline bool netif_device_present(struct net_device *dev)
3836 {
3837         return test_bit(__LINK_STATE_PRESENT, &dev->state);
3838 }
3839 
3840 void netif_device_detach(struct net_device *dev);
3841 
3842 void netif_device_attach(struct net_device *dev);
3843 
3844 /*
3845  * Network interface message level settings
3846  */
3847 
3848 enum {
3849         NETIF_MSG_DRV           = 0x0001,
3850         NETIF_MSG_PROBE         = 0x0002,
3851         NETIF_MSG_LINK          = 0x0004,
3852         NETIF_MSG_TIMER         = 0x0008,
3853         NETIF_MSG_IFDOWN        = 0x0010,
3854         NETIF_MSG_IFUP          = 0x0020,
3855         NETIF_MSG_RX_ERR        = 0x0040,
3856         NETIF_MSG_TX_ERR        = 0x0080,
3857         NETIF_MSG_TX_QUEUED     = 0x0100,
3858         NETIF_MSG_INTR          = 0x0200,
3859         NETIF_MSG_TX_DONE       = 0x0400,
3860         NETIF_MSG_RX_STATUS     = 0x0800,
3861         NETIF_MSG_PKTDATA       = 0x1000,
3862         NETIF_MSG_HW            = 0x2000,
3863         NETIF_MSG_WOL           = 0x4000,
3864 };
3865 
3866 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
3867 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
3868 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
3869 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
3870 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
3871 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
3872 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
3873 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
3874 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
3875 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
3876 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
3877 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
3878 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
3879 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
3880 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
3881 
3882 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
3883 {
3884         /* use default */
3885         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
3886                 return default_msg_enable_bits;
3887         if (debug_value == 0)   /* no output */
3888                 return 0;
3889         /* set low N bits */
3890         return (1U << debug_value) - 1;
3891 }
3892 
3893 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
3894 {
3895         spin_lock(&txq->_xmit_lock);
3896         txq->xmit_lock_owner = cpu;
3897 }
3898 
3899 static inline bool __netif_tx_acquire(struct netdev_queue *txq)
3900 {
3901         __acquire(&txq->_xmit_lock);
3902         return true;
3903 }
3904 
3905 static inline void __netif_tx_release(struct netdev_queue *txq)
3906 {
3907         __release(&txq->_xmit_lock);
3908 }
3909 
3910 static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
3911 {
3912         spin_lock_bh(&txq->_xmit_lock);
3913         txq->xmit_lock_owner = smp_processor_id();
3914 }
3915 
3916 static inline bool __netif_tx_trylock(struct netdev_queue *txq)
3917 {
3918         bool ok = spin_trylock(&txq->_xmit_lock);
3919         if (likely(ok))
3920                 txq->xmit_lock_owner = smp_processor_id();
3921         return ok;
3922 }
3923 
3924 static inline void __netif_tx_unlock(struct netdev_queue *txq)
3925 {
3926         txq->xmit_lock_owner = -1;
3927         spin_unlock(&txq->_xmit_lock);
3928 }
3929 
3930 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
3931 {
3932         txq->xmit_lock_owner = -1;
3933         spin_unlock_bh(&txq->_xmit_lock);
3934 }
3935 
3936 static inline void txq_trans_update(struct netdev_queue *txq)
3937 {
3938         if (txq->xmit_lock_owner != -1)
3939                 txq->trans_start = jiffies;
3940 }
3941 
3942 /* legacy drivers only, netdev_start_xmit() sets txq->trans_start */
3943 static inline void netif_trans_update(struct net_device *dev)
3944 {
3945         struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
3946 
3947         if (txq->trans_start != jiffies)
3948                 txq->trans_start = jiffies;
3949 }
3950 
3951 /**
3952  *      netif_tx_lock - grab network device transmit lock
3953  *      @dev: network device
3954  *
3955  * Get network device transmit lock
3956  */
3957 static inline void netif_tx_lock(struct net_device *dev)
3958 {
3959         unsigned int i;
3960         int cpu;
3961 
3962         spin_lock(&dev->tx_global_lock);
3963         cpu = smp_processor_id();
3964         for (i = 0; i < dev->num_tx_queues; i++) {
3965                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3966 
3967                 /* We are the only thread of execution doing a
3968                  * freeze, but we have to grab the _xmit_lock in
3969                  * order to synchronize with threads which are in
3970                  * the ->hard_start_xmit() handler and already
3971                  * checked the frozen bit.
3972                  */
3973                 __netif_tx_lock(txq, cpu);
3974                 set_bit(__QUEUE_STATE_FROZEN, &txq->state);
3975                 __netif_tx_unlock(txq);
3976         }
3977 }
3978 
3979 static inline void netif_tx_lock_bh(struct net_device *dev)
3980 {
3981         local_bh_disable();
3982         netif_tx_lock(dev);
3983 }
3984 
3985 static inline void netif_tx_unlock(struct net_device *dev)
3986 {
3987         unsigned int i;
3988 
3989         for (i = 0; i < dev->num_tx_queues; i++) {
3990                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3991 
3992                 /* No need to grab the _xmit_lock here.  If the
3993                  * queue is not stopped for another reason, we
3994                  * force a schedule.
3995                  */
3996                 clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
3997                 netif_schedule_queue(txq);
3998         }
3999         spin_unlock(&dev->tx_global_lock);
4000 }
4001 
4002 static inline void netif_tx_unlock_bh(struct net_device *dev)
4003 {
4004         netif_tx_unlock(dev);
4005         local_bh_enable();
4006 }
4007 
4008 #define HARD_TX_LOCK(dev, txq, cpu) {                   \
4009         if ((dev->features & NETIF_F_LLTX) == 0) {      \
4010                 __netif_tx_lock(txq, cpu);              \
4011         } else {                                        \
4012                 __netif_tx_acquire(txq);                \
4013         }                                               \
4014 }
4015 
4016 #define HARD_TX_TRYLOCK(dev, txq)                       \
4017         (((dev->features & NETIF_F_LLTX) == 0) ?        \
4018                 __netif_tx_trylock(txq) :               \
4019                 __netif_tx_acquire(txq))
4020 
4021 #define HARD_TX_UNLOCK(dev, txq) {                      \
4022         if ((dev->features & NETIF_F_LLTX) == 0) {      \
4023                 __netif_tx_unlock(txq);                 \
4024         } else {                                        \
4025                 __netif_tx_release(txq);                \
4026         }                                               \
4027 }
4028 
4029 static inline void netif_tx_disable(struct net_device *dev)
4030 {
4031         unsigned int i;
4032         int cpu;
4033 
4034         local_bh_disable();
4035         cpu = smp_processor_id();
4036         for (i = 0; i < dev->num_tx_queues; i++) {
4037                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
4038 
4039                 __netif_tx_lock(txq, cpu);
4040                 netif_tx_stop_queue(txq);
4041                 __netif_tx_unlock(txq);
4042         }
4043         local_bh_enable();
4044 }
4045 
4046 static inline void netif_addr_lock(struct net_device *dev)
4047 {
4048         spin_lock(&dev->addr_list_lock);
4049 }
4050 
4051 static inline void netif_addr_lock_nested(struct net_device *dev)
4052 {
4053         int subclass = SINGLE_DEPTH_NESTING;
4054 
4055         if (dev->netdev_ops->ndo_get_lock_subclass)
4056                 subclass = dev->netdev_ops->ndo_get_lock_subclass(dev);
4057 
4058         spin_lock_nested(&dev->addr_list_lock, subclass);
4059 }
4060 
4061 static inline void netif_addr_lock_bh(struct net_device *dev)
4062 {
4063         spin_lock_bh(&dev->addr_list_lock);
4064 }
4065 
4066 static inline void netif_addr_unlock(struct net_device *dev)
4067 {
4068         spin_unlock(&dev->addr_list_lock);
4069 }
4070 
4071 static inline void netif_addr_unlock_bh(struct net_device *dev)
4072 {
4073         spin_unlock_bh(&dev->addr_list_lock);
4074 }
4075 
4076 /*
4077  * dev_addrs walker. Should be used only for read access. Call with
4078  * rcu_read_lock held.
4079  */
4080 #define for_each_dev_addr(dev, ha) \
4081                 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
4082 
4083 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
4084 
4085 void ether_setup(struct net_device *dev);
4086 
4087 /* Support for loadable net-drivers */
4088 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
4089                                     unsigned char name_assign_type,
4090                                     void (*setup)(struct net_device *),
4091                                     unsigned int txqs, unsigned int rxqs);
4092 int dev_get_valid_name(struct net *net, struct net_device *dev,
4093                        const char *name);
4094 
4095 #define alloc_netdev(sizeof_priv, name, name_assign_type, setup) \
4096         alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, 1, 1)
4097 
4098 #define alloc_netdev_mq(sizeof_priv, name, name_assign_type, setup, count) \
4099         alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, count, \
4100                          count)
4101 
4102 int register_netdev(struct net_device *dev);
4103 void unregister_netdev(struct net_device *dev);
4104 
4105 /* General hardware address lists handling functions */
4106 int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
4107                    struct netdev_hw_addr_list *from_list, int addr_len);
4108 void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
4109                       struct netdev_hw_addr_list *from_list, int addr_len);
4110 int __hw_addr_sync_dev(struct netdev_hw_addr_list *list,
4111                        struct net_device *dev,
4112                        int (*sync)(struct net_device *, const unsigned char *),
4113                        int (*unsync)(struct net_device *,
4114                                      const unsigned char *));
4115 int __hw_addr_ref_sync_dev(struct netdev_hw_addr_list *list,
4116                            struct net_device *dev,
4117                            int (*sync)(struct net_device *,
4118                                        const unsigned char *, int),
4119                            int (*unsync)(struct net_device *,
4120                                          const unsigned char *, int));
4121 void __hw_addr_ref_unsync_dev(struct netdev_hw_addr_list *list,
4122                               struct net_device *dev,
4123                               int (*unsync)(struct net_device *,
4124                                             const unsigned char *, int));
4125 void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list,
4126                           struct net_device *dev,
4127                           int (*unsync)(struct net_device *,
4128                                         const unsigned char *));
4129 void __hw_addr_init(struct netdev_hw_addr_list *list);
4130 
4131 /* Functions used for device addresses handling */
4132 int dev_addr_add(struct net_device *dev, const unsigned char *addr,
4133                  unsigned char addr_type);
4134 int dev_addr_del(struct net_device *dev, const unsigned char *addr,
4135                  unsigned char addr_type);
4136 void dev_addr_flush(struct net_device *dev);
4137 int dev_addr_init(struct net_device *dev);
4138 
4139 /* Functions used for unicast addresses handling */
4140 int dev_uc_add(struct net_device *dev, const unsigned char *addr);
4141 int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr);
4142 int dev_uc_del(struct net_device *dev, const unsigned char *addr);
4143 int dev_uc_sync(struct net_device *to, struct net_device *from);
4144 int dev_uc_sync_multiple(struct net_device *to, struct net_device *from);
4145 void dev_uc_unsync(struct net_device *to, struct net_device *from);
4146 void dev_uc_flush(struct net_device *dev);
4147 void dev_uc_init(struct net_device *dev);
4148 
4149 /**
4150  *  __dev_uc_sync - Synchonize device's unicast list
4151  *  @dev:  device to sync
4152  *  @sync: function to call if address should be added
4153  *  @unsync: function to call if address should be removed
4154  *
4155  *  Add newly added addresses to the interface, and release
4156  *  addresses that have been deleted.
4157  */
4158 static inline int __dev_uc_sync(struct net_device *dev,
4159                                 int (*sync)(struct net_device *,
4160                                             const unsigned char *),
4161                                 int (*unsync)(struct net_device *,
4162                                               const unsigned char *))
4163 {
4164         return __hw_addr_sync_dev(&dev->uc, dev, sync, unsync);
4165 }
4166 
4167 /**
4168  *  __dev_uc_unsync - Remove synchronized addresses from device
4169  *  @dev:  device to sync
4170  *  @unsync: function to call if address should be removed
4171  *
4172  *  Remove all addresses that were added to the device by dev_uc_sync().
4173  */
4174 static inline void __dev_uc_unsync(struct net_device *dev,
4175                                    int (*unsync)(struct net_device *,
4176                                                  const unsigned char *))
4177 {
4178         __hw_addr_unsync_dev(&dev->uc, dev, unsync);
4179 }
4180 
4181 /* Functions used for multicast addresses handling */
4182 int dev_mc_add(struct net_device *dev, const unsigned char *addr);
4183 int dev_mc_add_global(struct net_device *dev, const unsigned char *addr);
4184 int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr);
4185 int dev_mc_del(struct net_device *dev, const unsigned char *addr);
4186 int dev_mc_del_global(struct net_device *dev, const unsigned char *addr);
4187 int dev_mc_sync(struct net_device *to, struct net_device *from);
4188 int dev_mc_sync_multiple(struct net_device *to, struct net_device *from);
4189 void dev_mc_unsync(struct net_device *to, struct net_device *from);
4190 void dev_mc_flush(struct net_device *dev);
4191 void dev_mc_init(struct net_device *dev);
4192 
4193 /**
4194  *  __dev_mc_sync - Synchonize device's multicast list
4195  *  @dev:  device to sync
4196  *  @sync: function to call if address should be added
4197  *  @unsync: function to call if address should be removed
4198  *
4199  *  Add newly added addresses to the interface, and release
4200  *  addresses that have been deleted.
4201  */
4202 static inline int __dev_mc_sync(struct net_device *dev,
4203                                 int (*sync)(struct net_device *,
4204                                             const unsigned char *),
4205                                 int (*unsync)(struct net_device *,
4206                                               const unsigned char *))
4207 {
4208         return __hw_addr_sync_dev(&dev->mc, dev, sync, unsync);
4209 }
4210 
4211 /**
4212  *  __dev_mc_unsync - Remove synchronized addresses from device
4213  *  @dev:  device to sync
4214  *  @unsync: function to call if address should be removed
4215  *
4216  *  Remove all addresses that were added to the device by dev_mc_sync().
4217  */
4218 static inline void __dev_mc_unsync(struct net_device *dev,
4219                                    int (*unsync)(struct net_device *,
4220                                                  const unsigned char *))
4221 {
4222         __hw_addr_unsync_dev(&dev->mc, dev, unsync);
4223 }
4224 
4225 /* Functions used for secondary unicast and multicast support */
4226 void dev_set_rx_mode(struct net_device *dev);
4227 void __dev_set_rx_mode(struct net_device *dev);
4228 int dev_set_promiscuity(struct net_device *dev, int inc);
4229 int dev_set_allmulti(struct net_device *dev, int inc);
4230 void netdev_state_change(struct net_device *dev);
4231 void netdev_notify_peers(struct net_device *dev);
4232 void netdev_features_change(struct net_device *dev);
4233 /* Load a device via the kmod */
4234 void dev_load(struct net *net, const char *name);
4235 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
4236                                         struct rtnl_link_stats64 *storage);
4237 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
4238                              const struct net_device_stats *netdev_stats);
4239 
4240 extern int              netdev_max_backlog;
4241 extern int              netdev_tstamp_prequeue;
4242 extern int              weight_p;
4243 extern int              dev_weight_rx_bias;
4244 extern int              dev_weight_tx_bias;
4245 extern int              dev_rx_weight;
4246 extern int              dev_tx_weight;
4247 
4248 bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev);
4249 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
4250                                                      struct list_head **iter);
4251 struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
4252                                                      struct list_head **iter);
4253 
4254 /* iterate through upper list, must be called under RCU read lock */
4255 #define netdev_for_each_upper_dev_rcu(dev, updev, iter) \
4256         for (iter = &(dev)->adj_list.upper, \
4257              updev = netdev_upper_get_next_dev_rcu(dev, &(iter)); \
4258              updev; \
4259              updev = netdev_upper_get_next_dev_rcu(dev, &(iter)))
4260 
4261 int netdev_walk_all_upper_dev_rcu(struct net_device *dev,
4262                                   int (*fn)(struct net_device *upper_dev,
4263                                             void *data),
4264                                   void *data);
4265 
4266 bool netdev_has_upper_dev_all_rcu(struct net_device *dev,
4267                                   struct net_device *upper_dev);
4268 
4269 bool netdev_has_any_upper_dev(struct net_device *dev);
4270 
4271 void *netdev_lower_get_next_private(struct net_device *dev,
4272                                     struct list_head **iter);
4273 void *netdev_lower_get_next_private_rcu(struct net_device *dev,
4274                                         struct list_head **iter);
4275 
4276 #define netdev_for_each_lower_private(dev, priv, iter) \
4277         for (iter = (dev)->adj_list.lower.next, \
4278              priv = netdev_lower_get_next_private(dev, &(iter)); \
4279              priv; \
4280              priv = netdev_lower_get_next_private(dev, &(iter)))
4281 
4282 #define netdev_for_each_lower_private_rcu(dev, priv, iter) \
4283         for (iter = &(dev)->adj_list.lower, \
4284              priv = netdev_lower_get_next_private_rcu(dev, &(iter)); \
4285              priv; \
4286              priv = netdev_lower_get_next_private_rcu(dev, &(iter)))
4287 
4288 void *netdev_lower_get_next(struct net_device *dev,
4289                                 struct list_head **iter);
4290 
4291 #define netdev_for_each_lower_dev(dev, ldev, iter) \
4292         for (iter = (dev)->adj_list.lower.next, \
4293              ldev = netdev_lower_get_next(dev, &(iter)); \
4294              ldev; \
4295              ldev = netdev_lower_get_next(dev, &(iter)))
4296 
4297 struct net_device *netdev_all_lower_get_next(struct net_device *dev,
4298                                              struct list_head **iter);
4299 struct net_device *netdev_all_lower_get_next_rcu(struct net_device *dev,
4300                                                  struct list_head **iter);
4301 
4302 int netdev_walk_all_lower_dev(struct net_device *dev,
4303                               int (*fn)(struct net_device *lower_dev,
4304                                         void *data),
4305                               void *data);
4306 int netdev_walk_all_lower_dev_rcu(struct net_device *dev,
4307                                   int (*fn)(struct net_device *lower_dev,
4308                                             void *data),
4309                                   void *data);
4310 
4311 void *netdev_adjacent_get_private(struct list_head *adj_list);
4312 void *netdev_lower_get_first_private_rcu(struct net_device *dev);
4313 struct net_device *netdev_master_upper_dev_get(struct net_device *dev);
4314 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev);
4315 int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev,
4316                           struct netlink_ext_ack *extack);
4317 int netdev_master_upper_dev_link(struct net_device *dev,
4318                                  struct net_device *upper_dev,
4319                                  void *upper_priv, void *upper_info,
4320                                  struct netlink_ext_ack *extack);
4321 void netdev_upper_dev_unlink(struct net_device *dev,
4322                              struct net_device *upper_dev);
4323 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
4324 void *netdev_lower_dev_get_private(struct net_device *dev,
4325                                    struct net_device *lower_dev);
4326 void netdev_lower_state_changed(struct net_device *lower_dev,
4327                                 void *lower_state_info);
4328 
4329 /* RSS keys are 40 or 52 bytes long */
4330 #define NETDEV_RSS_KEY_LEN 52
4331 extern u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly;
4332 void netdev_rss_key_fill(void *buffer, size_t len);
4333 
4334 int dev_get_nest_level(struct net_device *dev);
4335 int skb_checksum_help(struct sk_buff *skb);
4336 int skb_crc32c_csum_help(struct sk_buff *skb);
4337 int skb_csum_hwoffload_help(struct sk_buff *skb,
4338                             const netdev_features_t features);
4339 
4340 struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
4341                                   netdev_features_t features, bool tx_path);
4342 struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
4343                                     netdev_features_t features);
4344 
4345 struct netdev_bonding_info {
4346         ifslave slave;
4347         ifbond  master;
4348 };
4349 
4350 struct netdev_notifier_bonding_info {
4351         struct netdev_notifier_info info; /* must be first */
4352         struct netdev_bonding_info  bonding_info;
4353 };
4354 
4355 void netdev_bonding_info_change(struct net_device *dev,
4356                                 struct netdev_bonding_info *bonding_info);
4357 
4358 static inline
4359 struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
4360 {
4361         return __skb_gso_segment(skb, features, true);
4362 }
4363 __be16 skb_network_protocol(struct sk_buff *skb, int *depth);
4364 
4365 static inline bool can_checksum_protocol(netdev_features_t features,
4366                                          __be16 protocol)
4367 {
4368         if (protocol == htons(ETH_P_FCOE))
4369                 return !!(features & NETIF_F_FCOE_CRC);
4370 
4371         /* Assume this is an IP checksum (not SCTP CRC) */
4372 
4373         if (features & NETIF_F_HW_CSUM) {
4374                 /* Can checksum everything */
4375                 return true;
4376         }
4377 
4378         switch (protocol) {
4379         case htons(ETH_P_IP):
4380                 return !!(features & NETIF_F_IP_CSUM);
4381         case htons(ETH_P_IPV6):
4382                 return !!(features & NETIF_F_IPV6_CSUM);
4383         default:
4384                 return false;
4385         }
4386 }
4387 
4388 #ifdef CONFIG_BUG
4389 void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb);
4390 #else
4391 static inline void netdev_rx_csum_fault(struct net_device *dev,
4392                                         struct sk_buff *skb)
4393 {
4394 }
4395 #endif
4396 /* rx skb timestamps */
4397 void net_enable_timestamp(void);
4398 void net_disable_timestamp(void);
4399 
4400 #ifdef CONFIG_PROC_FS
4401 int __init dev_proc_init(void);
4402 #else
4403 #define dev_proc_init() 0
4404 #endif
4405 
4406 static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
4407                                               struct sk_buff *skb, struct net_device *dev,
4408                                               bool more)
4409 {
4410         __this_cpu_write(softnet_data.xmit.more, more);
4411         return ops->ndo_start_xmit(skb, dev);
4412 }
4413 
4414 static inline bool netdev_xmit_more(void)
4415 {
4416         return __this_cpu_read(softnet_data.xmit.more);
4417 }
4418 
4419 static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev,
4420                                             struct netdev_queue *txq, bool more)
4421 {
4422         const struct net_device_ops *ops = dev->netdev_ops;
4423         netdev_tx_t rc;
4424 
4425         rc = __netdev_start_xmit(ops, skb, dev, more);
4426         if (rc == NETDEV_TX_OK)
4427                 txq_trans_update(txq);
4428 
4429         return rc;
4430 }
4431 
4432 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
4433                                 const void *ns);
4434 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
4435                                  const void *ns);
4436 
4437 static inline int netdev_class_create_file(const struct class_attribute *class_attr)
4438 {
4439         return netdev_class_create_file_ns(class_attr, NULL);
4440 }
4441 
4442 static inline void netdev_class_remove_file(const struct class_attribute *class_attr)
4443 {
4444         netdev_class_remove_file_ns(class_attr, NULL);
4445 }
4446 
4447 extern const struct kobj_ns_type_operations net_ns_type_operations;
4448 
4449 const char *netdev_drivername(const struct net_device *dev);
4450 
4451 void linkwatch_run_queue(void);
4452 
4453 static inline netdev_features_t netdev_intersect_features(netdev_features_t f1,
4454                                                           netdev_features_t f2)
4455 {
4456         if ((f1 ^ f2) & NETIF_F_HW_CSUM) {
4457                 if (f1 & NETIF_F_HW_CSUM)
4458                         f1 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4459                 else
4460                         f2 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4461         }
4462 
4463         return f1 & f2;
4464 }
4465 
4466 static inline netdev_features_t netdev_get_wanted_features(
4467         struct net_device *dev)
4468 {
4469         return (dev->features & ~dev->hw_features) | dev->wanted_features;
4470 }
4471 netdev_features_t netdev_increment_features(netdev_features_t all,
4472         netdev_features_t one, netdev_features_t mask);
4473 
4474 /* Allow TSO being used on stacked device :
4475  * Performing the GSO segmentation before last device
4476  * is a performance improvement.
4477  */
4478 static inline netdev_features_t netdev_add_tso_features(netdev_features_t features,
4479                                                         netdev_features_t mask)
4480 {
4481         return netdev_increment_features(features, NETIF_F_ALL_TSO, mask);
4482 }
4483 
4484 int __netdev_update_features(struct net_device *dev);
4485 void netdev_update_features(struct net_device *dev);
4486 void netdev_change_features(struct net_device *dev);
4487 
4488 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4489                                         struct net_device *dev);
4490 
4491 netdev_features_t passthru_features_check(struct sk_buff *skb,
4492                                           struct net_device *dev,
4493                                           netdev_features_t features);
4494 netdev_features_t netif_skb_features(struct sk_buff *skb);
4495 
4496 static inline bool net_gso_ok(netdev_features_t features, int gso_type)
4497 {
4498         netdev_features_t feature = (netdev_features_t)gso_type << NETIF_F_GSO_SHIFT;
4499 
4500         /* check flags correspondence */
4501         BUILD_BUG_ON(SKB_GSO_TCPV4   != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
4502         BUILD_BUG_ON(SKB_GSO_DODGY   != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
4503         BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
4504         BUILD_BUG_ON(SKB_GSO_TCP_FIXEDID != (NETIF_F_TSO_MANGLEID >> NETIF_F_GSO_SHIFT));
4505         BUILD_BUG_ON(SKB_GSO_TCPV6   != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
4506         BUILD_BUG_ON(SKB_GSO_FCOE    != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));
4507         BUILD_BUG_ON(SKB_GSO_GRE     != (NETIF_F_GSO_GRE >> NETIF_F_GSO_SHIFT));
4508         BUILD_BUG_ON(SKB_GSO_GRE_CSUM != (NETIF_F_GSO_GRE_CSUM >> NETIF_F_GSO_SHIFT));
4509         BUILD_BUG_ON(SKB_GSO_IPXIP4  != (NETIF_F_GSO_IPXIP4 >> NETIF_F_GSO_SHIFT));
4510         BUILD_BUG_ON(SKB_GSO_IPXIP6  != (NETIF_F_GSO_IPXIP6 >> NETIF_F_GSO_SHIFT));
4511         BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL != (NETIF_F_GSO_UDP_TUNNEL >> NETIF_F_GSO_SHIFT));
4512         BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL_CSUM != (NETIF_F_GSO_UDP_TUNNEL_CSUM >> NETIF_F_GSO_SHIFT));
4513         BUILD_BUG_ON(SKB_GSO_PARTIAL != (NETIF_F_GSO_PARTIAL >> NETIF_F_GSO_SHIFT));
4514         BUILD_BUG_ON(SKB_GSO_TUNNEL_REMCSUM != (NETIF_F_GSO_TUNNEL_REMCSUM >> NETIF_F_GSO_SHIFT));
4515         BUILD_BUG_ON(SKB_GSO_SCTP    != (NETIF_F_GSO_SCTP >> NETIF_F_GSO_SHIFT));
4516         BUILD_BUG_ON(SKB_GSO_ESP != (NETIF_F_GSO_ESP >> NETIF_F_GSO_SHIFT));
4517         BUILD_BUG_ON(SKB_GSO_UDP != (NETIF_F_GSO_UDP >> NETIF_F_GSO_SHIFT));
4518         BUILD_BUG_ON(SKB_GSO_UDP_L4 != (NETIF_F_GSO_UDP_L4 >> NETIF_F_GSO_SHIFT));
4519 
4520         return (features & feature) == feature;
4521 }
4522 
4523 static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
4524 {
4525         return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
4526                (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
4527 }
4528 
4529 static inline bool netif_needs_gso(struct sk_buff *skb,
4530                                    netdev_features_t features)
4531 {
4532         return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
4533                 unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
4534                          (skb->ip_summed != CHECKSUM_UNNECESSARY)));
4535 }
4536 
4537 static inline void netif_set_gso_max_size(struct net_device *dev,
4538                                           unsigned int size)
4539 {
4540         dev->gso_max_size = size;
4541 }
4542 
4543 static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol,
4544                                         int pulled_hlen, u16 mac_offset,
4545                                         int mac_len)
4546 {
4547         skb->protocol = protocol;
4548         skb->encapsulation = 1;
4549         skb_push(skb, pulled_hlen);
4550         skb_reset_transport_header(skb);
4551         skb->mac_header = mac_offset;
4552         skb->network_header = skb->mac_header + mac_len;
4553         skb->mac_len = mac_len;
4554 }
4555 
4556 static inline bool netif_is_macsec(const struct net_device *dev)
4557 {
4558         return dev->priv_flags & IFF_MACSEC;
4559 }
4560 
4561 static inline bool netif_is_macvlan(const struct net_device *dev)
4562 {
4563         return dev->priv_flags & IFF_MACVLAN;
4564 }
4565 
4566 static inline bool netif_is_macvlan_port(const struct net_device *dev)
4567 {
4568         return dev->priv_flags & IFF_MACVLAN_PORT;
4569 }
4570 
4571 static inline bool netif_is_bond_master(const struct net_device *dev)
4572 {
4573         return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING;
4574 }
4575 
4576 static inline bool netif_is_bond_slave(const struct net_device *dev)
4577 {
4578         return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
4579 }
4580 
4581 static inline bool netif_supports_nofcs(struct net_device *dev)
4582 {
4583         return dev->priv_flags & IFF_SUPP_NOFCS;
4584 }
4585 
4586 static inline bool netif_has_l3_rx_handler(const struct net_device *dev)
4587 {
4588         return dev->priv_flags & IFF_L3MDEV_RX_HANDLER;
4589 }
4590 
4591 static inline bool netif_is_l3_master(const struct net_device *dev)
4592 {
4593         return dev->priv_flags & IFF_L3MDEV_MASTER;
4594 }
4595 
4596 static inline bool netif_is_l3_slave(const struct net_device *dev)
4597 {
4598         return dev->priv_flags & IFF_L3MDEV_SLAVE;
4599 }
4600 
4601 static inline bool netif_is_bridge_master(const struct net_device *dev)
4602 {
4603         return dev->priv_flags & IFF_EBRIDGE;
4604 }
4605 
4606 static inline bool netif_is_bridge_port(const struct net_device *dev)
4607 {
4608         return dev->priv_flags & IFF_BRIDGE_PORT;
4609 }
4610 
4611 static inline bool netif_is_ovs_master(const struct net_device *dev)
4612 {
4613         return dev->priv_flags & IFF_OPENVSWITCH;
4614 }
4615 
4616 static inline bool netif_is_ovs_port(const struct net_device *dev)
4617 {
4618         return dev->priv_flags & IFF_OVS_DATAPATH;
4619 }
4620 
4621 static inline bool netif_is_team_master(const struct net_device *dev)
4622 {
4623         return dev->priv_flags & IFF_TEAM;
4624 }
4625 
4626 static inline bool netif_is_team_port(const struct net_device *dev)
4627 {
4628         return dev->priv_flags & IFF_TEAM_PORT;
4629 }
4630 
4631 static inline bool netif_is_lag_master(const struct net_device *dev)
4632 {
4633         return netif_is_bond_master(dev) || netif_is_team_master(dev);
4634 }
4635 
4636 static inline bool netif_is_lag_port(const struct net_device *dev)
4637 {
4638         return netif_is_bond_slave(dev) || netif_is_team_port(dev);
4639 }
4640 
4641 static inline bool netif_is_rxfh_configured(const struct net_device *dev)
4642 {
4643         return dev->priv_flags & IFF_RXFH_CONFIGURED;
4644 }
4645 
4646 static inline bool netif_is_failover(const struct net_device *dev)
4647 {
4648         return dev->priv_flags & IFF_FAILOVER;
4649 }
4650 
4651 static inline bool netif_is_failover_slave(const struct net_device *dev)
4652 {
4653         return dev->priv_flags & IFF_FAILOVER_SLAVE;
4654 }
4655 
4656 /* This device needs to keep skb dst for qdisc enqueue or ndo_start_xmit() */
4657 static inline void netif_keep_dst(struct net_device *dev)
4658 {
4659         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM);
4660 }
4661 
4662 /* return true if dev can't cope with mtu frames that need vlan tag insertion */
4663 static inline bool netif_reduces_vlan_mtu(struct net_device *dev)
4664 {
4665         /* TODO: reserve and use an additional IFF bit, if we get more users */
4666         return dev->priv_flags & IFF_MACSEC;
4667 }
4668 
4669 extern struct pernet_operations __net_initdata loopback_net_ops;
4670 
4671 /* Logging, debugging and troubleshooting/diagnostic helpers. */
4672 
4673 /* netdev_printk helpers, similar to dev_printk */
4674 
4675 static inline const char *netdev_name(const struct net_device *dev)
4676 {
4677         if (!dev->name[0] || strchr(dev->name, '%'))
4678                 return "(unnamed net_device)";
4679         return dev->name;
4680 }
4681 
4682 static inline bool netdev_unregistering(const struct net_device *dev)
4683 {
4684         return dev->reg_state == NETREG_UNREGISTERING;
4685 }
4686 
4687 static inline const char *netdev_reg_state(const struct net_device *dev)
4688 {
4689         switch (dev->reg_state) {
4690         case NETREG_UNINITIALIZED: return " (uninitialized)";
4691         case NETREG_REGISTERED: return "";
4692         case NETREG_UNREGISTERING: return " (unregistering)";
4693         case NETREG_UNREGISTERED: return " (unregistered)";
4694         case NETREG_RELEASED: return " (released)";
4695         case NETREG_DUMMY: return " (dummy)";
4696         }
4697 
4698         WARN_ONCE(1, "%s: unknown reg_state %d\n", dev->name, dev->reg_state);
4699         return " (unknown)";
4700 }
4701 
4702 __printf(3, 4) __cold
4703 void netdev_printk(const char *level, const struct net_device *dev,
4704                    const char *format, ...);
4705 __printf(2, 3) __cold
4706 void netdev_emerg(const struct net_device *dev, const char *format, ...);
4707 __printf(2, 3) __cold
4708 void netdev_alert(const struct net_device *dev, const char *format, ...);
4709 __printf(2, 3) __cold
4710 void netdev_crit(const struct net_device *dev, const char *format, ...);
4711 __printf(2, 3) __cold
4712 void netdev_err(const struct net_device *dev, const char *format, ...);
4713 __printf(2, 3) __cold
4714 void netdev_warn(const struct net_device *dev, const char *format, ...);
4715 __printf(2, 3) __cold
4716 void netdev_notice(const struct net_device *dev, const char *format, ...);
4717 __printf(2, 3) __cold
4718 void netdev_info(const struct net_device *dev, const char *format, ...);
4719 
4720 #define netdev_level_once(level, dev, fmt, ...)                 \
4721 do {                                                            \
4722         static bool __print_once __read_mostly;                 \
4723                                                                 \
4724         if (!__print_once) {                                    \
4725                 __print_once = true;                            \
4726                 netdev_printk(level, dev, fmt, ##__VA_ARGS__);  \
4727         }                                                       \
4728 } while (0)
4729 
4730 #define netdev_emerg_once(dev, fmt, ...) \
4731         netdev_level_once(KERN_EMERG, dev, fmt, ##__VA_ARGS__)
4732 #define netdev_alert_once(dev, fmt, ...) \
4733         netdev_level_once(KERN_ALERT, dev, fmt, ##__VA_ARGS__)
4734 #define netdev_crit_once(dev, fmt, ...) \
4735         netdev_level_once(KERN_CRIT, dev, fmt, ##__VA_ARGS__)
4736 #define netdev_err_once(dev, fmt, ...) \
4737         netdev_level_once(KERN_ERR, dev, fmt, ##__VA_ARGS__)
4738 #define netdev_warn_once(dev, fmt, ...) \
4739         netdev_level_once(KERN_WARNING, dev, fmt, ##__VA_ARGS__)
4740 #define netdev_notice_once(dev, fmt, ...) \
4741         netdev_level_once(KERN_NOTICE, dev, fmt, ##__VA_ARGS__)
4742 #define netdev_info_once(dev, fmt, ...) \
4743         netdev_level_once(KERN_INFO, dev, fmt, ##__VA_ARGS__)
4744 
4745 #define MODULE_ALIAS_NETDEV(device) \
4746         MODULE_ALIAS("netdev-" device)
4747 
4748 #if defined(CONFIG_DYNAMIC_DEBUG)
4749 #define netdev_dbg(__dev, format, args...)                      \
4750 do {                                                            \
4751         dynamic_netdev_dbg(__dev, format, ##args);              \
4752 } while (0)
4753 #elif defined(DEBUG)
4754 #define netdev_dbg(__dev, format, args...)                      \
4755         netdev_printk(KERN_DEBUG, __dev, format, ##args)
4756 #else
4757 #define netdev_dbg(__dev, format, args...)                      \
4758 ({                                                              \
4759         if (0)                                                  \
4760                 netdev_printk(KERN_DEBUG, __dev, format, ##args); \
4761 })
4762 #endif
4763 
4764 #if defined(VERBOSE_DEBUG)
4765 #define netdev_vdbg     netdev_dbg
4766 #else
4767 
4768 #define netdev_vdbg(dev, format, args...)                       \
4769 ({                                                              \
4770         if (0)                                                  \
4771                 netdev_printk(KERN_DEBUG, dev, format, ##args); \
4772         0;                                                      \
4773 })
4774 #endif
4775 
4776 /*
4777  * netdev_WARN() acts like dev_printk(), but with the key difference
4778  * of using a WARN/WARN_ON to get the message out, including the
4779  * file/line information and a backtrace.
4780  */
4781 #define netdev_WARN(dev, format, args...)                       \
4782         WARN(1, "netdevice: %s%s: " format, netdev_name(dev),   \
4783              netdev_reg_state(dev), ##args)
4784 
4785 #define netdev_WARN_ONCE(dev, format, args...)                          \
4786         WARN_ONCE(1, "netdevice: %s%s: " format, netdev_name(dev),      \
4787                   netdev_reg_state(dev), ##args)
4788 
4789 /* netif printk helpers, similar to netdev_printk */
4790 
4791 #define netif_printk(priv, type, level, dev, fmt, args...)      \
4792 do {                                                            \
4793         if (netif_msg_##type(priv))                             \
4794                 netdev_printk(level, (dev), fmt, ##args);       \
4795 } while (0)
4796 
4797 #define netif_level(level, priv, type, dev, fmt, args...)       \
4798 do {                                                            \
4799         if (netif_msg_##type(priv))                             \
4800                 netdev_##level(dev, fmt, ##args);               \
4801 } while (0)
4802 
4803 #define netif_emerg(priv, type, dev, fmt, args...)              \
4804         netif_level(emerg, priv, type, dev, fmt, ##args)
4805 #define netif_alert(priv, type, dev, fmt, args...)              \
4806         netif_level(alert, priv, type, dev, fmt, ##args)
4807 #define netif_crit(priv, type, dev, fmt, args...)               \
4808         netif_level(crit, priv, type, dev, fmt, ##args)
4809 #define netif_err(priv, type, dev, fmt, args...)                \
4810         netif_level(err, priv, type, dev, fmt, ##args)
4811 #define netif_warn(priv, type, dev, fmt, args...)               \
4812         netif_level(warn, priv, type, dev, fmt, ##args)
4813 #define netif_notice(priv, type, dev, fmt, args...)             \
4814         netif_level(notice, priv, type, dev, fmt, ##args)
4815 #define netif_info(priv, type, dev, fmt, args...)               \
4816         netif_level(info, priv, type, dev, fmt, ##args)
4817 
4818 #if defined(CONFIG_DYNAMIC_DEBUG)
4819 #define netif_dbg(priv, type, netdev, format, args...)          \
4820 do {                                                            \
4821         if (netif_msg_##type(priv))                             \
4822                 dynamic_netdev_dbg(netdev, format, ##args);     \
4823 } while (0)
4824 #elif defined(DEBUG)
4825 #define netif_dbg(priv, type, dev, format, args...)             \
4826         netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
4827 #else
4828 #define netif_dbg(priv, type, dev, format, args...)                     \
4829 ({                                                                      \
4830         if (0)                                                          \
4831                 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
4832         0;                                                              \
4833 })
4834 #endif
4835 
4836 /* if @cond then downgrade to debug, else print at @level */
4837 #define netif_cond_dbg(priv, type, netdev, cond, level, fmt, args...)     \
4838         do {                                                              \
4839                 if (cond)                                                 \
4840                         netif_dbg(priv, type, netdev, fmt, ##args);       \
4841                 else                                                      \
4842                         netif_ ## level(priv, type, netdev, fmt, ##args); \
4843         } while (0)
4844 
4845 #if defined(VERBOSE_DEBUG)
4846 #define netif_vdbg      netif_dbg
4847 #else
4848 #define netif_vdbg(priv, type, dev, format, args...)            \
4849 ({                                                              \
4850         if (0)                                                  \
4851                 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
4852         0;                                                      \
4853 })
4854 #endif
4855 
4856 /*
4857  *      The list of packet types we will receive (as opposed to discard)
4858  *      and the routines to invoke.
4859  *
4860  *      Why 16. Because with 16 the only overlap we get on a hash of the
4861  *      low nibble of the protocol value is RARP/SNAP/X.25.
4862  *
4863  *              0800    IP
4864  *              0001    802.3
4865  *              0002    AX.25
4866  *              0004    802.2
4867  *              8035    RARP
4868  *              0005    SNAP
4869  *              0805    X.25
4870  *              0806    ARP
4871  *              8137    IPX
4872  *              0009    Localtalk
4873  *              86DD    IPv6
4874  */
4875 #define PTYPE_HASH_SIZE (16)
4876 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
4877 
4878 extern struct net_device *blackhole_netdev;
4879 
4880 #endif  /* _LINUX_NETDEVICE_H */
4881 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp