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TOMOYO Linux Cross Reference
Linux/include/net/sch_generic.h

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  1 #ifndef __NET_SCHED_GENERIC_H
  2 #define __NET_SCHED_GENERIC_H
  3 
  4 #include <linux/netdevice.h>
  5 #include <linux/types.h>
  6 #include <linux/rcupdate.h>
  7 #include <linux/pkt_sched.h>
  8 #include <linux/pkt_cls.h>
  9 #include <linux/percpu.h>
 10 #include <linux/dynamic_queue_limits.h>
 11 #include <net/gen_stats.h>
 12 #include <net/rtnetlink.h>
 13 
 14 struct Qdisc_ops;
 15 struct qdisc_walker;
 16 struct tcf_walker;
 17 struct module;
 18 
 19 struct qdisc_rate_table {
 20         struct tc_ratespec rate;
 21         u32             data[256];
 22         struct qdisc_rate_table *next;
 23         int             refcnt;
 24 };
 25 
 26 enum qdisc_state_t {
 27         __QDISC_STATE_SCHED,
 28         __QDISC_STATE_DEACTIVATED,
 29         __QDISC_STATE_THROTTLED,
 30 };
 31 
 32 /*
 33  * following bits are only changed while qdisc lock is held
 34  */
 35 enum qdisc___state_t {
 36         __QDISC___STATE_RUNNING = 1,
 37 };
 38 
 39 struct qdisc_size_table {
 40         struct rcu_head         rcu;
 41         struct list_head        list;
 42         struct tc_sizespec      szopts;
 43         int                     refcnt;
 44         u16                     data[];
 45 };
 46 
 47 struct Qdisc {
 48         int                     (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
 49         struct sk_buff *        (*dequeue)(struct Qdisc *dev);
 50         unsigned int            flags;
 51 #define TCQ_F_BUILTIN           1
 52 #define TCQ_F_INGRESS           2
 53 #define TCQ_F_CAN_BYPASS        4
 54 #define TCQ_F_MQROOT            8
 55 #define TCQ_F_ONETXQUEUE        0x10 /* dequeue_skb() can assume all skbs are for
 56                                       * q->dev_queue : It can test
 57                                       * netif_xmit_frozen_or_stopped() before
 58                                       * dequeueing next packet.
 59                                       * Its true for MQ/MQPRIO slaves, or non
 60                                       * multiqueue device.
 61                                       */
 62 #define TCQ_F_WARN_NONWC        (1 << 16)
 63 #define TCQ_F_CPUSTATS          0x20 /* run using percpu statistics */
 64 #define TCQ_F_NOPARENT          0x40 /* root of its hierarchy :
 65                                       * qdisc_tree_decrease_qlen() should stop.
 66                                       */
 67         u32                     limit;
 68         const struct Qdisc_ops  *ops;
 69         struct qdisc_size_table __rcu *stab;
 70         struct list_head        list;
 71         u32                     handle;
 72         u32                     parent;
 73         int                     (*reshape_fail)(struct sk_buff *skb,
 74                                         struct Qdisc *q);
 75 
 76         void                    *u32_node;
 77 
 78         /* This field is deprecated, but it is still used by CBQ
 79          * and it will live until better solution will be invented.
 80          */
 81         struct Qdisc            *__parent;
 82         struct netdev_queue     *dev_queue;
 83 
 84         struct gnet_stats_rate_est64    rate_est;
 85         struct gnet_stats_basic_cpu __percpu *cpu_bstats;
 86         struct gnet_stats_queue __percpu *cpu_qstats;
 87 
 88         struct Qdisc            *next_sched;
 89         struct sk_buff          *gso_skb;
 90         /*
 91          * For performance sake on SMP, we put highly modified fields at the end
 92          */
 93         unsigned long           state;
 94         struct sk_buff_head     q;
 95         struct gnet_stats_basic_packed bstats;
 96         unsigned int            __state;
 97         struct gnet_stats_queue qstats;
 98         struct rcu_head         rcu_head;
 99         int                     padded;
100         atomic_t                refcnt;
101 
102         spinlock_t              busylock ____cacheline_aligned_in_smp;
103 };
104 
105 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
106 {
107         return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
108 }
109 
110 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
111 {
112         if (qdisc_is_running(qdisc))
113                 return false;
114         qdisc->__state |= __QDISC___STATE_RUNNING;
115         return true;
116 }
117 
118 static inline void qdisc_run_end(struct Qdisc *qdisc)
119 {
120         qdisc->__state &= ~__QDISC___STATE_RUNNING;
121 }
122 
123 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
124 {
125         return qdisc->flags & TCQ_F_ONETXQUEUE;
126 }
127 
128 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
129 {
130 #ifdef CONFIG_BQL
131         /* Non-BQL migrated drivers will return 0, too. */
132         return dql_avail(&txq->dql);
133 #else
134         return 0;
135 #endif
136 }
137 
138 static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
139 {
140         return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
141 }
142 
143 static inline void qdisc_throttled(struct Qdisc *qdisc)
144 {
145         set_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
146 }
147 
148 static inline void qdisc_unthrottled(struct Qdisc *qdisc)
149 {
150         clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
151 }
152 
153 struct Qdisc_class_ops {
154         /* Child qdisc manipulation */
155         struct netdev_queue *   (*select_queue)(struct Qdisc *, struct tcmsg *);
156         int                     (*graft)(struct Qdisc *, unsigned long cl,
157                                         struct Qdisc *, struct Qdisc **);
158         struct Qdisc *          (*leaf)(struct Qdisc *, unsigned long cl);
159         void                    (*qlen_notify)(struct Qdisc *, unsigned long);
160 
161         /* Class manipulation routines */
162         unsigned long           (*get)(struct Qdisc *, u32 classid);
163         void                    (*put)(struct Qdisc *, unsigned long);
164         int                     (*change)(struct Qdisc *, u32, u32,
165                                         struct nlattr **, unsigned long *);
166         int                     (*delete)(struct Qdisc *, unsigned long);
167         void                    (*walk)(struct Qdisc *, struct qdisc_walker * arg);
168 
169         /* Filter manipulation */
170         struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long);
171         bool                    (*tcf_cl_offload)(u32 classid);
172         unsigned long           (*bind_tcf)(struct Qdisc *, unsigned long,
173                                         u32 classid);
174         void                    (*unbind_tcf)(struct Qdisc *, unsigned long);
175 
176         /* rtnetlink specific */
177         int                     (*dump)(struct Qdisc *, unsigned long,
178                                         struct sk_buff *skb, struct tcmsg*);
179         int                     (*dump_stats)(struct Qdisc *, unsigned long,
180                                         struct gnet_dump *);
181 };
182 
183 struct Qdisc_ops {
184         struct Qdisc_ops        *next;
185         const struct Qdisc_class_ops    *cl_ops;
186         char                    id[IFNAMSIZ];
187         int                     priv_size;
188 
189         int                     (*enqueue)(struct sk_buff *, struct Qdisc *);
190         struct sk_buff *        (*dequeue)(struct Qdisc *);
191         struct sk_buff *        (*peek)(struct Qdisc *);
192         unsigned int            (*drop)(struct Qdisc *);
193 
194         int                     (*init)(struct Qdisc *, struct nlattr *arg);
195         void                    (*reset)(struct Qdisc *);
196         void                    (*destroy)(struct Qdisc *);
197         int                     (*change)(struct Qdisc *, struct nlattr *arg);
198         void                    (*attach)(struct Qdisc *);
199 
200         int                     (*dump)(struct Qdisc *, struct sk_buff *);
201         int                     (*dump_stats)(struct Qdisc *, struct gnet_dump *);
202 
203         struct module           *owner;
204 };
205 
206 
207 struct tcf_result {
208         unsigned long   class;
209         u32             classid;
210 };
211 
212 struct tcf_proto_ops {
213         struct list_head        head;
214         char                    kind[IFNAMSIZ];
215 
216         int                     (*classify)(struct sk_buff *,
217                                             const struct tcf_proto *,
218                                             struct tcf_result *);
219         int                     (*init)(struct tcf_proto*);
220         bool                    (*destroy)(struct tcf_proto*, bool);
221 
222         unsigned long           (*get)(struct tcf_proto*, u32 handle);
223         int                     (*change)(struct net *net, struct sk_buff *,
224                                         struct tcf_proto*, unsigned long,
225                                         u32 handle, struct nlattr **,
226                                         unsigned long *, bool);
227         int                     (*delete)(struct tcf_proto*, unsigned long);
228         void                    (*walk)(struct tcf_proto*, struct tcf_walker *arg);
229 
230         /* rtnetlink specific */
231         int                     (*dump)(struct net*, struct tcf_proto*, unsigned long,
232                                         struct sk_buff *skb, struct tcmsg*);
233 
234         struct module           *owner;
235 };
236 
237 struct tcf_proto {
238         /* Fast access part */
239         struct tcf_proto __rcu  *next;
240         void __rcu              *root;
241         int                     (*classify)(struct sk_buff *,
242                                             const struct tcf_proto *,
243                                             struct tcf_result *);
244         __be16                  protocol;
245 
246         /* All the rest */
247         u32                     prio;
248         u32                     classid;
249         struct Qdisc            *q;
250         void                    *data;
251         const struct tcf_proto_ops      *ops;
252         struct rcu_head         rcu;
253 };
254 
255 struct qdisc_skb_cb {
256         unsigned int            pkt_len;
257         u16                     slave_dev_queue_mapping;
258         u16                     tc_classid;
259 #define QDISC_CB_PRIV_LEN 20
260         unsigned char           data[QDISC_CB_PRIV_LEN];
261 };
262 
263 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
264 {
265         struct qdisc_skb_cb *qcb;
266 
267         BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
268         BUILD_BUG_ON(sizeof(qcb->data) < sz);
269 }
270 
271 static inline int qdisc_qlen(const struct Qdisc *q)
272 {
273         return q->q.qlen;
274 }
275 
276 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
277 {
278         return (struct qdisc_skb_cb *)skb->cb;
279 }
280 
281 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
282 {
283         return &qdisc->q.lock;
284 }
285 
286 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
287 {
288         struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
289 
290         return q;
291 }
292 
293 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
294 {
295         return qdisc->dev_queue->qdisc_sleeping;
296 }
297 
298 /* The qdisc root lock is a mechanism by which to top level
299  * of a qdisc tree can be locked from any qdisc node in the
300  * forest.  This allows changing the configuration of some
301  * aspect of the qdisc tree while blocking out asynchronous
302  * qdisc access in the packet processing paths.
303  *
304  * It is only legal to do this when the root will not change
305  * on us.  Otherwise we'll potentially lock the wrong qdisc
306  * root.  This is enforced by holding the RTNL semaphore, which
307  * all users of this lock accessor must do.
308  */
309 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
310 {
311         struct Qdisc *root = qdisc_root(qdisc);
312 
313         ASSERT_RTNL();
314         return qdisc_lock(root);
315 }
316 
317 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
318 {
319         struct Qdisc *root = qdisc_root_sleeping(qdisc);
320 
321         ASSERT_RTNL();
322         return qdisc_lock(root);
323 }
324 
325 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
326 {
327         return qdisc->dev_queue->dev;
328 }
329 
330 static inline void sch_tree_lock(const struct Qdisc *q)
331 {
332         spin_lock_bh(qdisc_root_sleeping_lock(q));
333 }
334 
335 static inline void sch_tree_unlock(const struct Qdisc *q)
336 {
337         spin_unlock_bh(qdisc_root_sleeping_lock(q));
338 }
339 
340 #define tcf_tree_lock(tp)       sch_tree_lock((tp)->q)
341 #define tcf_tree_unlock(tp)     sch_tree_unlock((tp)->q)
342 
343 extern struct Qdisc noop_qdisc;
344 extern struct Qdisc_ops noop_qdisc_ops;
345 extern struct Qdisc_ops pfifo_fast_ops;
346 extern struct Qdisc_ops mq_qdisc_ops;
347 extern struct Qdisc_ops noqueue_qdisc_ops;
348 extern const struct Qdisc_ops *default_qdisc_ops;
349 static inline const struct Qdisc_ops *
350 get_default_qdisc_ops(const struct net_device *dev, int ntx)
351 {
352         return ntx < dev->real_num_tx_queues ?
353                         default_qdisc_ops : &pfifo_fast_ops;
354 }
355 
356 struct Qdisc_class_common {
357         u32                     classid;
358         struct hlist_node       hnode;
359 };
360 
361 struct Qdisc_class_hash {
362         struct hlist_head       *hash;
363         unsigned int            hashsize;
364         unsigned int            hashmask;
365         unsigned int            hashelems;
366 };
367 
368 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
369 {
370         id ^= id >> 8;
371         id ^= id >> 4;
372         return id & mask;
373 }
374 
375 static inline struct Qdisc_class_common *
376 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
377 {
378         struct Qdisc_class_common *cl;
379         unsigned int h;
380 
381         h = qdisc_class_hash(id, hash->hashmask);
382         hlist_for_each_entry(cl, &hash->hash[h], hnode) {
383                 if (cl->classid == id)
384                         return cl;
385         }
386         return NULL;
387 }
388 
389 int qdisc_class_hash_init(struct Qdisc_class_hash *);
390 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
391                              struct Qdisc_class_common *);
392 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
393                              struct Qdisc_class_common *);
394 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
395 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
396 
397 void dev_init_scheduler(struct net_device *dev);
398 void dev_shutdown(struct net_device *dev);
399 void dev_activate(struct net_device *dev);
400 void dev_deactivate(struct net_device *dev);
401 void dev_deactivate_many(struct list_head *head);
402 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
403                               struct Qdisc *qdisc);
404 void qdisc_reset(struct Qdisc *qdisc);
405 void qdisc_destroy(struct Qdisc *qdisc);
406 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
407                                unsigned int len);
408 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
409                           const struct Qdisc_ops *ops);
410 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
411                                 const struct Qdisc_ops *ops, u32 parentid);
412 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
413                                const struct qdisc_size_table *stab);
414 bool tcf_destroy(struct tcf_proto *tp, bool force);
415 void tcf_destroy_chain(struct tcf_proto __rcu **fl);
416 int skb_do_redirect(struct sk_buff *);
417 
418 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
419 {
420 #ifdef CONFIG_NET_CLS_ACT
421         return G_TC_AT(skb->tc_verd) & AT_INGRESS;
422 #else
423         return false;
424 #endif
425 }
426 
427 /* Reset all TX qdiscs greater then index of a device.  */
428 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
429 {
430         struct Qdisc *qdisc;
431 
432         for (; i < dev->num_tx_queues; i++) {
433                 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
434                 if (qdisc) {
435                         spin_lock_bh(qdisc_lock(qdisc));
436                         qdisc_reset(qdisc);
437                         spin_unlock_bh(qdisc_lock(qdisc));
438                 }
439         }
440 }
441 
442 static inline void qdisc_reset_all_tx(struct net_device *dev)
443 {
444         qdisc_reset_all_tx_gt(dev, 0);
445 }
446 
447 /* Are all TX queues of the device empty?  */
448 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
449 {
450         unsigned int i;
451 
452         rcu_read_lock();
453         for (i = 0; i < dev->num_tx_queues; i++) {
454                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
455                 const struct Qdisc *q = rcu_dereference(txq->qdisc);
456 
457                 if (q->q.qlen) {
458                         rcu_read_unlock();
459                         return false;
460                 }
461         }
462         rcu_read_unlock();
463         return true;
464 }
465 
466 /* Are any of the TX qdiscs changing?  */
467 static inline bool qdisc_tx_changing(const struct net_device *dev)
468 {
469         unsigned int i;
470 
471         for (i = 0; i < dev->num_tx_queues; i++) {
472                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
473                 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
474                         return true;
475         }
476         return false;
477 }
478 
479 /* Is the device using the noop qdisc on all queues?  */
480 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
481 {
482         unsigned int i;
483 
484         for (i = 0; i < dev->num_tx_queues; i++) {
485                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
486                 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
487                         return false;
488         }
489         return true;
490 }
491 
492 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
493 {
494         return qdisc_skb_cb(skb)->pkt_len;
495 }
496 
497 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
498 enum net_xmit_qdisc_t {
499         __NET_XMIT_STOLEN = 0x00010000,
500         __NET_XMIT_BYPASS = 0x00020000,
501 };
502 
503 #ifdef CONFIG_NET_CLS_ACT
504 #define net_xmit_drop_count(e)  ((e) & __NET_XMIT_STOLEN ? 0 : 1)
505 #else
506 #define net_xmit_drop_count(e)  (1)
507 #endif
508 
509 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
510                                            const struct Qdisc *sch)
511 {
512 #ifdef CONFIG_NET_SCHED
513         struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
514 
515         if (stab)
516                 __qdisc_calculate_pkt_len(skb, stab);
517 #endif
518 }
519 
520 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
521 {
522         qdisc_calculate_pkt_len(skb, sch);
523         return sch->enqueue(skb, sch);
524 }
525 
526 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
527 {
528         return q->flags & TCQ_F_CPUSTATS;
529 }
530 
531 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
532                                   __u64 bytes, __u32 packets)
533 {
534         bstats->bytes += bytes;
535         bstats->packets += packets;
536 }
537 
538 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
539                                  const struct sk_buff *skb)
540 {
541         _bstats_update(bstats,
542                        qdisc_pkt_len(skb),
543                        skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
544 }
545 
546 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
547                                       __u64 bytes, __u32 packets)
548 {
549         u64_stats_update_begin(&bstats->syncp);
550         _bstats_update(&bstats->bstats, bytes, packets);
551         u64_stats_update_end(&bstats->syncp);
552 }
553 
554 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
555                                      const struct sk_buff *skb)
556 {
557         u64_stats_update_begin(&bstats->syncp);
558         bstats_update(&bstats->bstats, skb);
559         u64_stats_update_end(&bstats->syncp);
560 }
561 
562 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
563                                            const struct sk_buff *skb)
564 {
565         bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
566 }
567 
568 static inline void qdisc_bstats_update(struct Qdisc *sch,
569                                        const struct sk_buff *skb)
570 {
571         bstats_update(&sch->bstats, skb);
572 }
573 
574 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
575                                             const struct sk_buff *skb)
576 {
577         sch->qstats.backlog -= qdisc_pkt_len(skb);
578 }
579 
580 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
581                                             const struct sk_buff *skb)
582 {
583         sch->qstats.backlog += qdisc_pkt_len(skb);
584 }
585 
586 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
587 {
588         sch->qstats.drops += count;
589 }
590 
591 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
592 {
593         qstats->drops++;
594 }
595 
596 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
597 {
598         qstats->overlimits++;
599 }
600 
601 static inline void qdisc_qstats_drop(struct Qdisc *sch)
602 {
603         qstats_drop_inc(&sch->qstats);
604 }
605 
606 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
607 {
608         qstats_drop_inc(this_cpu_ptr(sch->cpu_qstats));
609 }
610 
611 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
612 {
613         sch->qstats.overlimits++;
614 }
615 
616 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
617                                        struct sk_buff_head *list)
618 {
619         __skb_queue_tail(list, skb);
620         qdisc_qstats_backlog_inc(sch, skb);
621 
622         return NET_XMIT_SUCCESS;
623 }
624 
625 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
626 {
627         return __qdisc_enqueue_tail(skb, sch, &sch->q);
628 }
629 
630 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
631                                                    struct sk_buff_head *list)
632 {
633         struct sk_buff *skb = __skb_dequeue(list);
634 
635         if (likely(skb != NULL)) {
636                 qdisc_qstats_backlog_dec(sch, skb);
637                 qdisc_bstats_update(sch, skb);
638         }
639 
640         return skb;
641 }
642 
643 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
644 {
645         return __qdisc_dequeue_head(sch, &sch->q);
646 }
647 
648 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
649                                               struct sk_buff_head *list)
650 {
651         struct sk_buff *skb = __skb_dequeue(list);
652 
653         if (likely(skb != NULL)) {
654                 unsigned int len = qdisc_pkt_len(skb);
655                 qdisc_qstats_backlog_dec(sch, skb);
656                 kfree_skb(skb);
657                 return len;
658         }
659 
660         return 0;
661 }
662 
663 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
664 {
665         return __qdisc_queue_drop_head(sch, &sch->q);
666 }
667 
668 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
669                                                    struct sk_buff_head *list)
670 {
671         struct sk_buff *skb = __skb_dequeue_tail(list);
672 
673         if (likely(skb != NULL))
674                 qdisc_qstats_backlog_dec(sch, skb);
675 
676         return skb;
677 }
678 
679 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
680 {
681         return __qdisc_dequeue_tail(sch, &sch->q);
682 }
683 
684 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
685 {
686         return skb_peek(&sch->q);
687 }
688 
689 /* generic pseudo peek method for non-work-conserving qdisc */
690 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
691 {
692         /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
693         if (!sch->gso_skb) {
694                 sch->gso_skb = sch->dequeue(sch);
695                 if (sch->gso_skb) {
696                         /* it's still part of the queue */
697                         qdisc_qstats_backlog_inc(sch, sch->gso_skb);
698                         sch->q.qlen++;
699                 }
700         }
701 
702         return sch->gso_skb;
703 }
704 
705 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
706 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
707 {
708         struct sk_buff *skb = sch->gso_skb;
709 
710         if (skb) {
711                 sch->gso_skb = NULL;
712                 qdisc_qstats_backlog_dec(sch, skb);
713                 sch->q.qlen--;
714         } else {
715                 skb = sch->dequeue(sch);
716         }
717 
718         return skb;
719 }
720 
721 static inline void __qdisc_reset_queue(struct Qdisc *sch,
722                                        struct sk_buff_head *list)
723 {
724         /*
725          * We do not know the backlog in bytes of this list, it
726          * is up to the caller to correct it
727          */
728         __skb_queue_purge(list);
729 }
730 
731 static inline void qdisc_reset_queue(struct Qdisc *sch)
732 {
733         __qdisc_reset_queue(sch, &sch->q);
734         sch->qstats.backlog = 0;
735 }
736 
737 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
738                                           struct Qdisc **pold)
739 {
740         struct Qdisc *old;
741 
742         sch_tree_lock(sch);
743         old = *pold;
744         *pold = new;
745         if (old != NULL) {
746                 qdisc_tree_reduce_backlog(old, old->q.qlen, old->qstats.backlog);
747                 qdisc_reset(old);
748         }
749         sch_tree_unlock(sch);
750 
751         return old;
752 }
753 
754 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
755                                               struct sk_buff_head *list)
756 {
757         struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
758 
759         if (likely(skb != NULL)) {
760                 unsigned int len = qdisc_pkt_len(skb);
761                 kfree_skb(skb);
762                 return len;
763         }
764 
765         return 0;
766 }
767 
768 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
769 {
770         return __qdisc_queue_drop(sch, &sch->q);
771 }
772 
773 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
774 {
775         kfree_skb(skb);
776         qdisc_qstats_drop(sch);
777 
778         return NET_XMIT_DROP;
779 }
780 
781 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
782 {
783         qdisc_qstats_drop(sch);
784 
785 #ifdef CONFIG_NET_CLS_ACT
786         if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
787                 goto drop;
788 
789         return NET_XMIT_SUCCESS;
790 
791 drop:
792 #endif
793         kfree_skb(skb);
794         return NET_XMIT_DROP;
795 }
796 
797 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
798    long it will take to send a packet given its size.
799  */
800 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
801 {
802         int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
803         if (slot < 0)
804                 slot = 0;
805         slot >>= rtab->rate.cell_log;
806         if (slot > 255)
807                 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
808         return rtab->data[slot];
809 }
810 
811 struct psched_ratecfg {
812         u64     rate_bytes_ps; /* bytes per second */
813         u32     mult;
814         u16     overhead;
815         u8      linklayer;
816         u8      shift;
817 };
818 
819 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
820                                 unsigned int len)
821 {
822         len += r->overhead;
823 
824         if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
825                 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
826 
827         return ((u64)len * r->mult) >> r->shift;
828 }
829 
830 void psched_ratecfg_precompute(struct psched_ratecfg *r,
831                                const struct tc_ratespec *conf,
832                                u64 rate64);
833 
834 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
835                                           const struct psched_ratecfg *r)
836 {
837         memset(res, 0, sizeof(*res));
838 
839         /* legacy struct tc_ratespec has a 32bit @rate field
840          * Qdisc using 64bit rate should add new attributes
841          * in order to maintain compatibility.
842          */
843         res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
844 
845         res->overhead = r->overhead;
846         res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
847 }
848 
849 #endif
850 

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