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

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef __NET_SCHED_GENERIC_H
  3 #define __NET_SCHED_GENERIC_H
  4 
  5 #include <linux/netdevice.h>
  6 #include <linux/types.h>
  7 #include <linux/rcupdate.h>
  8 #include <linux/pkt_sched.h>
  9 #include <linux/pkt_cls.h>
 10 #include <linux/percpu.h>
 11 #include <linux/dynamic_queue_limits.h>
 12 #include <linux/list.h>
 13 #include <linux/refcount.h>
 14 #include <linux/workqueue.h>
 15 #include <linux/mutex.h>
 16 #include <net/gen_stats.h>
 17 #include <net/rtnetlink.h>
 18 
 19 struct Qdisc_ops;
 20 struct qdisc_walker;
 21 struct tcf_walker;
 22 struct module;
 23 struct bpf_flow_keys;
 24 
 25 typedef int tc_setup_cb_t(enum tc_setup_type type,
 26                           void *type_data, void *cb_priv);
 27 
 28 typedef int tc_indr_block_bind_cb_t(struct net_device *dev, void *cb_priv,
 29                                     enum tc_setup_type type, void *type_data);
 30 
 31 struct qdisc_rate_table {
 32         struct tc_ratespec rate;
 33         u32             data[256];
 34         struct qdisc_rate_table *next;
 35         int             refcnt;
 36 };
 37 
 38 enum qdisc_state_t {
 39         __QDISC_STATE_SCHED,
 40         __QDISC_STATE_DEACTIVATED,
 41 };
 42 
 43 struct qdisc_size_table {
 44         struct rcu_head         rcu;
 45         struct list_head        list;
 46         struct tc_sizespec      szopts;
 47         int                     refcnt;
 48         u16                     data[];
 49 };
 50 
 51 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
 52 struct qdisc_skb_head {
 53         struct sk_buff  *head;
 54         struct sk_buff  *tail;
 55         __u32           qlen;
 56         spinlock_t      lock;
 57 };
 58 
 59 struct Qdisc {
 60         int                     (*enqueue)(struct sk_buff *skb,
 61                                            struct Qdisc *sch,
 62                                            struct sk_buff **to_free);
 63         struct sk_buff *        (*dequeue)(struct Qdisc *sch);
 64         unsigned int            flags;
 65 #define TCQ_F_BUILTIN           1
 66 #define TCQ_F_INGRESS           2
 67 #define TCQ_F_CAN_BYPASS        4
 68 #define TCQ_F_MQROOT            8
 69 #define TCQ_F_ONETXQUEUE        0x10 /* dequeue_skb() can assume all skbs are for
 70                                       * q->dev_queue : It can test
 71                                       * netif_xmit_frozen_or_stopped() before
 72                                       * dequeueing next packet.
 73                                       * Its true for MQ/MQPRIO slaves, or non
 74                                       * multiqueue device.
 75                                       */
 76 #define TCQ_F_WARN_NONWC        (1 << 16)
 77 #define TCQ_F_CPUSTATS          0x20 /* run using percpu statistics */
 78 #define TCQ_F_NOPARENT          0x40 /* root of its hierarchy :
 79                                       * qdisc_tree_decrease_qlen() should stop.
 80                                       */
 81 #define TCQ_F_INVISIBLE         0x80 /* invisible by default in dump */
 82 #define TCQ_F_NOLOCK            0x100 /* qdisc does not require locking */
 83 #define TCQ_F_OFFLOADED         0x200 /* qdisc is offloaded to HW */
 84         u32                     limit;
 85         const struct Qdisc_ops  *ops;
 86         struct qdisc_size_table __rcu *stab;
 87         struct hlist_node       hash;
 88         u32                     handle;
 89         u32                     parent;
 90 
 91         struct netdev_queue     *dev_queue;
 92 
 93         struct net_rate_estimator __rcu *rate_est;
 94         struct gnet_stats_basic_cpu __percpu *cpu_bstats;
 95         struct gnet_stats_queue __percpu *cpu_qstats;
 96         int                     padded;
 97         refcount_t              refcnt;
 98 
 99         /*
100          * For performance sake on SMP, we put highly modified fields at the end
101          */
102         struct sk_buff_head     gso_skb ____cacheline_aligned_in_smp;
103         struct qdisc_skb_head   q;
104         struct gnet_stats_basic_packed bstats;
105         seqcount_t              running;
106         struct gnet_stats_queue qstats;
107         unsigned long           state;
108         struct Qdisc            *next_sched;
109         struct sk_buff_head     skb_bad_txq;
110 
111         spinlock_t              busylock ____cacheline_aligned_in_smp;
112         spinlock_t              seqlock;
113 
114         /* for NOLOCK qdisc, true if there are no enqueued skbs */
115         bool                    empty;
116         struct rcu_head         rcu;
117 };
118 
119 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
120 {
121         if (qdisc->flags & TCQ_F_BUILTIN)
122                 return;
123         refcount_inc(&qdisc->refcnt);
124 }
125 
126 /* Intended to be used by unlocked users, when concurrent qdisc release is
127  * possible.
128  */
129 
130 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
131 {
132         if (qdisc->flags & TCQ_F_BUILTIN)
133                 return qdisc;
134         if (refcount_inc_not_zero(&qdisc->refcnt))
135                 return qdisc;
136         return NULL;
137 }
138 
139 static inline bool qdisc_is_running(struct Qdisc *qdisc)
140 {
141         if (qdisc->flags & TCQ_F_NOLOCK)
142                 return spin_is_locked(&qdisc->seqlock);
143         return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
144 }
145 
146 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
147 {
148         return q->flags & TCQ_F_CPUSTATS;
149 }
150 
151 static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
152 {
153         if (qdisc_is_percpu_stats(qdisc))
154                 return qdisc->empty;
155         return !qdisc->q.qlen;
156 }
157 
158 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
159 {
160         if (qdisc->flags & TCQ_F_NOLOCK) {
161                 if (!spin_trylock(&qdisc->seqlock))
162                         return false;
163                 qdisc->empty = false;
164         } else if (qdisc_is_running(qdisc)) {
165                 return false;
166         }
167         /* Variant of write_seqcount_begin() telling lockdep a trylock
168          * was attempted.
169          */
170         raw_write_seqcount_begin(&qdisc->running);
171         seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
172         return true;
173 }
174 
175 static inline void qdisc_run_end(struct Qdisc *qdisc)
176 {
177         write_seqcount_end(&qdisc->running);
178         if (qdisc->flags & TCQ_F_NOLOCK)
179                 spin_unlock(&qdisc->seqlock);
180 }
181 
182 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
183 {
184         return qdisc->flags & TCQ_F_ONETXQUEUE;
185 }
186 
187 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
188 {
189 #ifdef CONFIG_BQL
190         /* Non-BQL migrated drivers will return 0, too. */
191         return dql_avail(&txq->dql);
192 #else
193         return 0;
194 #endif
195 }
196 
197 struct Qdisc_class_ops {
198         unsigned int            flags;
199         /* Child qdisc manipulation */
200         struct netdev_queue *   (*select_queue)(struct Qdisc *, struct tcmsg *);
201         int                     (*graft)(struct Qdisc *, unsigned long cl,
202                                         struct Qdisc *, struct Qdisc **,
203                                         struct netlink_ext_ack *extack);
204         struct Qdisc *          (*leaf)(struct Qdisc *, unsigned long cl);
205         void                    (*qlen_notify)(struct Qdisc *, unsigned long);
206 
207         /* Class manipulation routines */
208         unsigned long           (*find)(struct Qdisc *, u32 classid);
209         int                     (*change)(struct Qdisc *, u32, u32,
210                                         struct nlattr **, unsigned long *,
211                                         struct netlink_ext_ack *);
212         int                     (*delete)(struct Qdisc *, unsigned long);
213         void                    (*walk)(struct Qdisc *, struct qdisc_walker * arg);
214 
215         /* Filter manipulation */
216         struct tcf_block *      (*tcf_block)(struct Qdisc *sch,
217                                              unsigned long arg,
218                                              struct netlink_ext_ack *extack);
219         unsigned long           (*bind_tcf)(struct Qdisc *, unsigned long,
220                                         u32 classid);
221         void                    (*unbind_tcf)(struct Qdisc *, unsigned long);
222 
223         /* rtnetlink specific */
224         int                     (*dump)(struct Qdisc *, unsigned long,
225                                         struct sk_buff *skb, struct tcmsg*);
226         int                     (*dump_stats)(struct Qdisc *, unsigned long,
227                                         struct gnet_dump *);
228 };
229 
230 /* Qdisc_class_ops flag values */
231 
232 /* Implements API that doesn't require rtnl lock */
233 enum qdisc_class_ops_flags {
234         QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
235 };
236 
237 struct Qdisc_ops {
238         struct Qdisc_ops        *next;
239         const struct Qdisc_class_ops    *cl_ops;
240         char                    id[IFNAMSIZ];
241         int                     priv_size;
242         unsigned int            static_flags;
243 
244         int                     (*enqueue)(struct sk_buff *skb,
245                                            struct Qdisc *sch,
246                                            struct sk_buff **to_free);
247         struct sk_buff *        (*dequeue)(struct Qdisc *);
248         struct sk_buff *        (*peek)(struct Qdisc *);
249 
250         int                     (*init)(struct Qdisc *sch, struct nlattr *arg,
251                                         struct netlink_ext_ack *extack);
252         void                    (*reset)(struct Qdisc *);
253         void                    (*destroy)(struct Qdisc *);
254         int                     (*change)(struct Qdisc *sch,
255                                           struct nlattr *arg,
256                                           struct netlink_ext_ack *extack);
257         void                    (*attach)(struct Qdisc *sch);
258         int                     (*change_tx_queue_len)(struct Qdisc *, unsigned int);
259 
260         int                     (*dump)(struct Qdisc *, struct sk_buff *);
261         int                     (*dump_stats)(struct Qdisc *, struct gnet_dump *);
262 
263         void                    (*ingress_block_set)(struct Qdisc *sch,
264                                                      u32 block_index);
265         void                    (*egress_block_set)(struct Qdisc *sch,
266                                                     u32 block_index);
267         u32                     (*ingress_block_get)(struct Qdisc *sch);
268         u32                     (*egress_block_get)(struct Qdisc *sch);
269 
270         struct module           *owner;
271 };
272 
273 
274 struct tcf_result {
275         union {
276                 struct {
277                         unsigned long   class;
278                         u32             classid;
279                 };
280                 const struct tcf_proto *goto_tp;
281 
282                 /* used by the TC_ACT_REINSERT action */
283                 struct {
284                         bool            ingress;
285                         struct gnet_stats_queue *qstats;
286                 };
287         };
288 };
289 
290 struct tcf_chain;
291 
292 struct tcf_proto_ops {
293         struct list_head        head;
294         char                    kind[IFNAMSIZ];
295 
296         int                     (*classify)(struct sk_buff *,
297                                             const struct tcf_proto *,
298                                             struct tcf_result *);
299         int                     (*init)(struct tcf_proto*);
300         void                    (*destroy)(struct tcf_proto *tp, bool rtnl_held,
301                                            struct netlink_ext_ack *extack);
302 
303         void*                   (*get)(struct tcf_proto*, u32 handle);
304         void                    (*put)(struct tcf_proto *tp, void *f);
305         int                     (*change)(struct net *net, struct sk_buff *,
306                                         struct tcf_proto*, unsigned long,
307                                         u32 handle, struct nlattr **,
308                                         void **, bool, bool,
309                                         struct netlink_ext_ack *);
310         int                     (*delete)(struct tcf_proto *tp, void *arg,
311                                           bool *last, bool rtnl_held,
312                                           struct netlink_ext_ack *);
313         void                    (*walk)(struct tcf_proto *tp,
314                                         struct tcf_walker *arg, bool rtnl_held);
315         int                     (*reoffload)(struct tcf_proto *tp, bool add,
316                                              tc_setup_cb_t *cb, void *cb_priv,
317                                              struct netlink_ext_ack *extack);
318         void                    (*bind_class)(void *, u32, unsigned long);
319         void *                  (*tmplt_create)(struct net *net,
320                                                 struct tcf_chain *chain,
321                                                 struct nlattr **tca,
322                                                 struct netlink_ext_ack *extack);
323         void                    (*tmplt_destroy)(void *tmplt_priv);
324 
325         /* rtnetlink specific */
326         int                     (*dump)(struct net*, struct tcf_proto*, void *,
327                                         struct sk_buff *skb, struct tcmsg*,
328                                         bool);
329         int                     (*tmplt_dump)(struct sk_buff *skb,
330                                               struct net *net,
331                                               void *tmplt_priv);
332 
333         struct module           *owner;
334         int                     flags;
335 };
336 
337 enum tcf_proto_ops_flags {
338         TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
339 };
340 
341 struct tcf_proto {
342         /* Fast access part */
343         struct tcf_proto __rcu  *next;
344         void __rcu              *root;
345 
346         /* called under RCU BH lock*/
347         int                     (*classify)(struct sk_buff *,
348                                             const struct tcf_proto *,
349                                             struct tcf_result *);
350         __be16                  protocol;
351 
352         /* All the rest */
353         u32                     prio;
354         void                    *data;
355         const struct tcf_proto_ops      *ops;
356         struct tcf_chain        *chain;
357         /* Lock protects tcf_proto shared state and can be used by unlocked
358          * classifiers to protect their private data.
359          */
360         spinlock_t              lock;
361         bool                    deleting;
362         refcount_t              refcnt;
363         struct rcu_head         rcu;
364 };
365 
366 struct qdisc_skb_cb {
367         struct {
368                 unsigned int            pkt_len;
369                 u16                     slave_dev_queue_mapping;
370                 u16                     tc_classid;
371         };
372 #define QDISC_CB_PRIV_LEN 20
373         unsigned char           data[QDISC_CB_PRIV_LEN];
374 };
375 
376 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
377 
378 struct tcf_chain {
379         /* Protects filter_chain. */
380         struct mutex filter_chain_lock;
381         struct tcf_proto __rcu *filter_chain;
382         struct list_head list;
383         struct tcf_block *block;
384         u32 index; /* chain index */
385         unsigned int refcnt;
386         unsigned int action_refcnt;
387         bool explicitly_created;
388         bool flushing;
389         const struct tcf_proto_ops *tmplt_ops;
390         void *tmplt_priv;
391         struct rcu_head rcu;
392 };
393 
394 struct tcf_block {
395         /* Lock protects tcf_block and lifetime-management data of chains
396          * attached to the block (refcnt, action_refcnt, explicitly_created).
397          */
398         struct mutex lock;
399         struct list_head chain_list;
400         u32 index; /* block index for shared blocks */
401         refcount_t refcnt;
402         struct net *net;
403         struct Qdisc *q;
404         struct list_head cb_list;
405         struct list_head owner_list;
406         bool keep_dst;
407         unsigned int offloadcnt; /* Number of oddloaded filters */
408         unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
409         struct {
410                 struct tcf_chain *chain;
411                 struct list_head filter_chain_list;
412         } chain0;
413         struct rcu_head rcu;
414 };
415 
416 #ifdef CONFIG_PROVE_LOCKING
417 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
418 {
419         return lockdep_is_held(&chain->filter_chain_lock);
420 }
421 
422 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
423 {
424         return lockdep_is_held(&tp->lock);
425 }
426 #else
427 static inline bool lockdep_tcf_chain_is_locked(struct tcf_block *chain)
428 {
429         return true;
430 }
431 
432 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
433 {
434         return true;
435 }
436 #endif /* #ifdef CONFIG_PROVE_LOCKING */
437 
438 #define tcf_chain_dereference(p, chain)                                 \
439         rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
440 
441 #define tcf_proto_dereference(p, tp)                                    \
442         rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
443 
444 static inline void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
445 {
446         if (*flags & TCA_CLS_FLAGS_IN_HW)
447                 return;
448         *flags |= TCA_CLS_FLAGS_IN_HW;
449         block->offloadcnt++;
450 }
451 
452 static inline void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
453 {
454         if (!(*flags & TCA_CLS_FLAGS_IN_HW))
455                 return;
456         *flags &= ~TCA_CLS_FLAGS_IN_HW;
457         block->offloadcnt--;
458 }
459 
460 static inline void
461 tc_cls_offload_cnt_update(struct tcf_block *block, u32 *cnt,
462                           u32 *flags, bool add)
463 {
464         if (add) {
465                 if (!*cnt)
466                         tcf_block_offload_inc(block, flags);
467                 (*cnt)++;
468         } else {
469                 (*cnt)--;
470                 if (!*cnt)
471                         tcf_block_offload_dec(block, flags);
472         }
473 }
474 
475 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
476 {
477         struct qdisc_skb_cb *qcb;
478 
479         BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
480         BUILD_BUG_ON(sizeof(qcb->data) < sz);
481 }
482 
483 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
484 {
485         return this_cpu_ptr(q->cpu_qstats)->qlen;
486 }
487 
488 static inline int qdisc_qlen(const struct Qdisc *q)
489 {
490         return q->q.qlen;
491 }
492 
493 static inline int qdisc_qlen_sum(const struct Qdisc *q)
494 {
495         __u32 qlen = q->qstats.qlen;
496         int i;
497 
498         if (qdisc_is_percpu_stats(q)) {
499                 for_each_possible_cpu(i)
500                         qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
501         } else {
502                 qlen += q->q.qlen;
503         }
504 
505         return qlen;
506 }
507 
508 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
509 {
510         return (struct qdisc_skb_cb *)skb->cb;
511 }
512 
513 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
514 {
515         return &qdisc->q.lock;
516 }
517 
518 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
519 {
520         struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
521 
522         return q;
523 }
524 
525 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
526 {
527         return qdisc->dev_queue->qdisc_sleeping;
528 }
529 
530 /* The qdisc root lock is a mechanism by which to top level
531  * of a qdisc tree can be locked from any qdisc node in the
532  * forest.  This allows changing the configuration of some
533  * aspect of the qdisc tree while blocking out asynchronous
534  * qdisc access in the packet processing paths.
535  *
536  * It is only legal to do this when the root will not change
537  * on us.  Otherwise we'll potentially lock the wrong qdisc
538  * root.  This is enforced by holding the RTNL semaphore, which
539  * all users of this lock accessor must do.
540  */
541 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
542 {
543         struct Qdisc *root = qdisc_root(qdisc);
544 
545         ASSERT_RTNL();
546         return qdisc_lock(root);
547 }
548 
549 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
550 {
551         struct Qdisc *root = qdisc_root_sleeping(qdisc);
552 
553         ASSERT_RTNL();
554         return qdisc_lock(root);
555 }
556 
557 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
558 {
559         struct Qdisc *root = qdisc_root_sleeping(qdisc);
560 
561         ASSERT_RTNL();
562         return &root->running;
563 }
564 
565 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
566 {
567         return qdisc->dev_queue->dev;
568 }
569 
570 static inline void sch_tree_lock(const struct Qdisc *q)
571 {
572         spin_lock_bh(qdisc_root_sleeping_lock(q));
573 }
574 
575 static inline void sch_tree_unlock(const struct Qdisc *q)
576 {
577         spin_unlock_bh(qdisc_root_sleeping_lock(q));
578 }
579 
580 extern struct Qdisc noop_qdisc;
581 extern struct Qdisc_ops noop_qdisc_ops;
582 extern struct Qdisc_ops pfifo_fast_ops;
583 extern struct Qdisc_ops mq_qdisc_ops;
584 extern struct Qdisc_ops noqueue_qdisc_ops;
585 extern const struct Qdisc_ops *default_qdisc_ops;
586 static inline const struct Qdisc_ops *
587 get_default_qdisc_ops(const struct net_device *dev, int ntx)
588 {
589         return ntx < dev->real_num_tx_queues ?
590                         default_qdisc_ops : &pfifo_fast_ops;
591 }
592 
593 struct Qdisc_class_common {
594         u32                     classid;
595         struct hlist_node       hnode;
596 };
597 
598 struct Qdisc_class_hash {
599         struct hlist_head       *hash;
600         unsigned int            hashsize;
601         unsigned int            hashmask;
602         unsigned int            hashelems;
603 };
604 
605 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
606 {
607         id ^= id >> 8;
608         id ^= id >> 4;
609         return id & mask;
610 }
611 
612 static inline struct Qdisc_class_common *
613 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
614 {
615         struct Qdisc_class_common *cl;
616         unsigned int h;
617 
618         if (!id)
619                 return NULL;
620 
621         h = qdisc_class_hash(id, hash->hashmask);
622         hlist_for_each_entry(cl, &hash->hash[h], hnode) {
623                 if (cl->classid == id)
624                         return cl;
625         }
626         return NULL;
627 }
628 
629 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
630 {
631         u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
632 
633         return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
634 }
635 
636 int qdisc_class_hash_init(struct Qdisc_class_hash *);
637 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
638                              struct Qdisc_class_common *);
639 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
640                              struct Qdisc_class_common *);
641 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
642 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
643 
644 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
645 void dev_init_scheduler(struct net_device *dev);
646 void dev_shutdown(struct net_device *dev);
647 void dev_activate(struct net_device *dev);
648 void dev_deactivate(struct net_device *dev);
649 void dev_deactivate_many(struct list_head *head);
650 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
651                               struct Qdisc *qdisc);
652 void qdisc_reset(struct Qdisc *qdisc);
653 void qdisc_put(struct Qdisc *qdisc);
654 void qdisc_put_unlocked(struct Qdisc *qdisc);
655 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
656 #ifdef CONFIG_NET_SCHED
657 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
658                               void *type_data);
659 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
660                                 struct Qdisc *new, struct Qdisc *old,
661                                 enum tc_setup_type type, void *type_data,
662                                 struct netlink_ext_ack *extack);
663 #else
664 static inline int
665 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
666                           void *type_data)
667 {
668         q->flags &= ~TCQ_F_OFFLOADED;
669         return 0;
670 }
671 
672 static inline void
673 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
674                            struct Qdisc *new, struct Qdisc *old,
675                            enum tc_setup_type type, void *type_data,
676                            struct netlink_ext_ack *extack)
677 {
678 }
679 #endif
680 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
681                           const struct Qdisc_ops *ops,
682                           struct netlink_ext_ack *extack);
683 void qdisc_free(struct Qdisc *qdisc);
684 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
685                                 const struct Qdisc_ops *ops, u32 parentid,
686                                 struct netlink_ext_ack *extack);
687 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
688                                const struct qdisc_size_table *stab);
689 int skb_do_redirect(struct sk_buff *);
690 
691 static inline void skb_reset_tc(struct sk_buff *skb)
692 {
693 #ifdef CONFIG_NET_CLS_ACT
694         skb->tc_redirected = 0;
695 #endif
696 }
697 
698 static inline bool skb_is_tc_redirected(const struct sk_buff *skb)
699 {
700 #ifdef CONFIG_NET_CLS_ACT
701         return skb->tc_redirected;
702 #else
703         return false;
704 #endif
705 }
706 
707 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
708 {
709 #ifdef CONFIG_NET_CLS_ACT
710         return skb->tc_at_ingress;
711 #else
712         return false;
713 #endif
714 }
715 
716 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
717 {
718 #ifdef CONFIG_NET_CLS_ACT
719         if (skb->tc_skip_classify) {
720                 skb->tc_skip_classify = 0;
721                 return true;
722         }
723 #endif
724         return false;
725 }
726 
727 /* Reset all TX qdiscs greater than index of a device.  */
728 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
729 {
730         struct Qdisc *qdisc;
731 
732         for (; i < dev->num_tx_queues; i++) {
733                 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
734                 if (qdisc) {
735                         spin_lock_bh(qdisc_lock(qdisc));
736                         qdisc_reset(qdisc);
737                         spin_unlock_bh(qdisc_lock(qdisc));
738                 }
739         }
740 }
741 
742 static inline void qdisc_reset_all_tx(struct net_device *dev)
743 {
744         qdisc_reset_all_tx_gt(dev, 0);
745 }
746 
747 /* Are all TX queues of the device empty?  */
748 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
749 {
750         unsigned int i;
751 
752         rcu_read_lock();
753         for (i = 0; i < dev->num_tx_queues; i++) {
754                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
755                 const struct Qdisc *q = rcu_dereference(txq->qdisc);
756 
757                 if (!qdisc_is_empty(q)) {
758                         rcu_read_unlock();
759                         return false;
760                 }
761         }
762         rcu_read_unlock();
763         return true;
764 }
765 
766 /* Are any of the TX qdiscs changing?  */
767 static inline bool qdisc_tx_changing(const struct net_device *dev)
768 {
769         unsigned int i;
770 
771         for (i = 0; i < dev->num_tx_queues; i++) {
772                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
773                 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
774                         return true;
775         }
776         return false;
777 }
778 
779 /* Is the device using the noop qdisc on all queues?  */
780 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
781 {
782         unsigned int i;
783 
784         for (i = 0; i < dev->num_tx_queues; i++) {
785                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
786                 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
787                         return false;
788         }
789         return true;
790 }
791 
792 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
793 {
794         return qdisc_skb_cb(skb)->pkt_len;
795 }
796 
797 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
798 enum net_xmit_qdisc_t {
799         __NET_XMIT_STOLEN = 0x00010000,
800         __NET_XMIT_BYPASS = 0x00020000,
801 };
802 
803 #ifdef CONFIG_NET_CLS_ACT
804 #define net_xmit_drop_count(e)  ((e) & __NET_XMIT_STOLEN ? 0 : 1)
805 #else
806 #define net_xmit_drop_count(e)  (1)
807 #endif
808 
809 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
810                                            const struct Qdisc *sch)
811 {
812 #ifdef CONFIG_NET_SCHED
813         struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
814 
815         if (stab)
816                 __qdisc_calculate_pkt_len(skb, stab);
817 #endif
818 }
819 
820 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
821                                 struct sk_buff **to_free)
822 {
823         qdisc_calculate_pkt_len(skb, sch);
824         return sch->enqueue(skb, sch, to_free);
825 }
826 
827 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
828                                   __u64 bytes, __u32 packets)
829 {
830         bstats->bytes += bytes;
831         bstats->packets += packets;
832 }
833 
834 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
835                                  const struct sk_buff *skb)
836 {
837         _bstats_update(bstats,
838                        qdisc_pkt_len(skb),
839                        skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
840 }
841 
842 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
843                                       __u64 bytes, __u32 packets)
844 {
845         u64_stats_update_begin(&bstats->syncp);
846         _bstats_update(&bstats->bstats, bytes, packets);
847         u64_stats_update_end(&bstats->syncp);
848 }
849 
850 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
851                                      const struct sk_buff *skb)
852 {
853         u64_stats_update_begin(&bstats->syncp);
854         bstats_update(&bstats->bstats, skb);
855         u64_stats_update_end(&bstats->syncp);
856 }
857 
858 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
859                                            const struct sk_buff *skb)
860 {
861         bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
862 }
863 
864 static inline void qdisc_bstats_update(struct Qdisc *sch,
865                                        const struct sk_buff *skb)
866 {
867         bstats_update(&sch->bstats, skb);
868 }
869 
870 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
871                                             const struct sk_buff *skb)
872 {
873         sch->qstats.backlog -= qdisc_pkt_len(skb);
874 }
875 
876 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
877                                                 const struct sk_buff *skb)
878 {
879         this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
880 }
881 
882 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
883                                             const struct sk_buff *skb)
884 {
885         sch->qstats.backlog += qdisc_pkt_len(skb);
886 }
887 
888 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
889                                                 const struct sk_buff *skb)
890 {
891         this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
892 }
893 
894 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
895 {
896         this_cpu_inc(sch->cpu_qstats->qlen);
897 }
898 
899 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
900 {
901         this_cpu_dec(sch->cpu_qstats->qlen);
902 }
903 
904 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
905 {
906         this_cpu_inc(sch->cpu_qstats->requeues);
907 }
908 
909 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
910 {
911         sch->qstats.drops += count;
912 }
913 
914 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
915 {
916         qstats->drops++;
917 }
918 
919 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
920 {
921         qstats->overlimits++;
922 }
923 
924 static inline void qdisc_qstats_drop(struct Qdisc *sch)
925 {
926         qstats_drop_inc(&sch->qstats);
927 }
928 
929 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
930 {
931         this_cpu_inc(sch->cpu_qstats->drops);
932 }
933 
934 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
935 {
936         sch->qstats.overlimits++;
937 }
938 
939 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
940 {
941         __u32 qlen = qdisc_qlen_sum(sch);
942 
943         return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
944 }
945 
946 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch,  __u32 *qlen,
947                                              __u32 *backlog)
948 {
949         struct gnet_stats_queue qstats = { 0 };
950         __u32 len = qdisc_qlen_sum(sch);
951 
952         __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
953         *qlen = qstats.qlen;
954         *backlog = qstats.backlog;
955 }
956 
957 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
958 {
959         __u32 qlen, backlog;
960 
961         qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
962         qdisc_tree_reduce_backlog(sch, qlen, backlog);
963 }
964 
965 static inline void qdisc_purge_queue(struct Qdisc *sch)
966 {
967         __u32 qlen, backlog;
968 
969         qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
970         qdisc_reset(sch);
971         qdisc_tree_reduce_backlog(sch, qlen, backlog);
972 }
973 
974 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
975 {
976         qh->head = NULL;
977         qh->tail = NULL;
978         qh->qlen = 0;
979 }
980 
981 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
982                                         struct qdisc_skb_head *qh)
983 {
984         struct sk_buff *last = qh->tail;
985 
986         if (last) {
987                 skb->next = NULL;
988                 last->next = skb;
989                 qh->tail = skb;
990         } else {
991                 qh->tail = skb;
992                 qh->head = skb;
993         }
994         qh->qlen++;
995 }
996 
997 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
998 {
999         __qdisc_enqueue_tail(skb, &sch->q);
1000         qdisc_qstats_backlog_inc(sch, skb);
1001         return NET_XMIT_SUCCESS;
1002 }
1003 
1004 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
1005                                         struct qdisc_skb_head *qh)
1006 {
1007         skb->next = qh->head;
1008 
1009         if (!qh->head)
1010                 qh->tail = skb;
1011         qh->head = skb;
1012         qh->qlen++;
1013 }
1014 
1015 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
1016 {
1017         struct sk_buff *skb = qh->head;
1018 
1019         if (likely(skb != NULL)) {
1020                 qh->head = skb->next;
1021                 qh->qlen--;
1022                 if (qh->head == NULL)
1023                         qh->tail = NULL;
1024                 skb->next = NULL;
1025         }
1026 
1027         return skb;
1028 }
1029 
1030 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1031 {
1032         struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1033 
1034         if (likely(skb != NULL)) {
1035                 qdisc_qstats_backlog_dec(sch, skb);
1036                 qdisc_bstats_update(sch, skb);
1037         }
1038 
1039         return skb;
1040 }
1041 
1042 /* Instead of calling kfree_skb() while root qdisc lock is held,
1043  * queue the skb for future freeing at end of __dev_xmit_skb()
1044  */
1045 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1046 {
1047         skb->next = *to_free;
1048         *to_free = skb;
1049 }
1050 
1051 static inline void __qdisc_drop_all(struct sk_buff *skb,
1052                                     struct sk_buff **to_free)
1053 {
1054         if (skb->prev)
1055                 skb->prev->next = *to_free;
1056         else
1057                 skb->next = *to_free;
1058         *to_free = skb;
1059 }
1060 
1061 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1062                                                    struct qdisc_skb_head *qh,
1063                                                    struct sk_buff **to_free)
1064 {
1065         struct sk_buff *skb = __qdisc_dequeue_head(qh);
1066 
1067         if (likely(skb != NULL)) {
1068                 unsigned int len = qdisc_pkt_len(skb);
1069 
1070                 qdisc_qstats_backlog_dec(sch, skb);
1071                 __qdisc_drop(skb, to_free);
1072                 return len;
1073         }
1074 
1075         return 0;
1076 }
1077 
1078 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
1079                                                  struct sk_buff **to_free)
1080 {
1081         return __qdisc_queue_drop_head(sch, &sch->q, to_free);
1082 }
1083 
1084 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1085 {
1086         const struct qdisc_skb_head *qh = &sch->q;
1087 
1088         return qh->head;
1089 }
1090 
1091 /* generic pseudo peek method for non-work-conserving qdisc */
1092 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1093 {
1094         struct sk_buff *skb = skb_peek(&sch->gso_skb);
1095 
1096         /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1097         if (!skb) {
1098                 skb = sch->dequeue(sch);
1099 
1100                 if (skb) {
1101                         __skb_queue_head(&sch->gso_skb, skb);
1102                         /* it's still part of the queue */
1103                         qdisc_qstats_backlog_inc(sch, skb);
1104                         sch->q.qlen++;
1105                 }
1106         }
1107 
1108         return skb;
1109 }
1110 
1111 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1112                                                  struct sk_buff *skb)
1113 {
1114         if (qdisc_is_percpu_stats(sch)) {
1115                 qdisc_qstats_cpu_backlog_dec(sch, skb);
1116                 qdisc_bstats_cpu_update(sch, skb);
1117                 qdisc_qstats_cpu_qlen_dec(sch);
1118         } else {
1119                 qdisc_qstats_backlog_dec(sch, skb);
1120                 qdisc_bstats_update(sch, skb);
1121                 sch->q.qlen--;
1122         }
1123 }
1124 
1125 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1126                                                  unsigned int pkt_len)
1127 {
1128         if (qdisc_is_percpu_stats(sch)) {
1129                 qdisc_qstats_cpu_qlen_inc(sch);
1130                 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1131         } else {
1132                 sch->qstats.backlog += pkt_len;
1133                 sch->q.qlen++;
1134         }
1135 }
1136 
1137 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1138 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1139 {
1140         struct sk_buff *skb = skb_peek(&sch->gso_skb);
1141 
1142         if (skb) {
1143                 skb = __skb_dequeue(&sch->gso_skb);
1144                 if (qdisc_is_percpu_stats(sch)) {
1145                         qdisc_qstats_cpu_backlog_dec(sch, skb);
1146                         qdisc_qstats_cpu_qlen_dec(sch);
1147                 } else {
1148                         qdisc_qstats_backlog_dec(sch, skb);
1149                         sch->q.qlen--;
1150                 }
1151         } else {
1152                 skb = sch->dequeue(sch);
1153         }
1154 
1155         return skb;
1156 }
1157 
1158 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1159 {
1160         /*
1161          * We do not know the backlog in bytes of this list, it
1162          * is up to the caller to correct it
1163          */
1164         ASSERT_RTNL();
1165         if (qh->qlen) {
1166                 rtnl_kfree_skbs(qh->head, qh->tail);
1167 
1168                 qh->head = NULL;
1169                 qh->tail = NULL;
1170                 qh->qlen = 0;
1171         }
1172 }
1173 
1174 static inline void qdisc_reset_queue(struct Qdisc *sch)
1175 {
1176         __qdisc_reset_queue(&sch->q);
1177         sch->qstats.backlog = 0;
1178 }
1179 
1180 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1181                                           struct Qdisc **pold)
1182 {
1183         struct Qdisc *old;
1184 
1185         sch_tree_lock(sch);
1186         old = *pold;
1187         *pold = new;
1188         if (old != NULL)
1189                 qdisc_tree_flush_backlog(old);
1190         sch_tree_unlock(sch);
1191 
1192         return old;
1193 }
1194 
1195 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1196 {
1197         rtnl_kfree_skbs(skb, skb);
1198         qdisc_qstats_drop(sch);
1199 }
1200 
1201 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1202                                  struct sk_buff **to_free)
1203 {
1204         __qdisc_drop(skb, to_free);
1205         qdisc_qstats_cpu_drop(sch);
1206 
1207         return NET_XMIT_DROP;
1208 }
1209 
1210 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1211                              struct sk_buff **to_free)
1212 {
1213         __qdisc_drop(skb, to_free);
1214         qdisc_qstats_drop(sch);
1215 
1216         return NET_XMIT_DROP;
1217 }
1218 
1219 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1220                                  struct sk_buff **to_free)
1221 {
1222         __qdisc_drop_all(skb, to_free);
1223         qdisc_qstats_drop(sch);
1224 
1225         return NET_XMIT_DROP;
1226 }
1227 
1228 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1229    long it will take to send a packet given its size.
1230  */
1231 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1232 {
1233         int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1234         if (slot < 0)
1235                 slot = 0;
1236         slot >>= rtab->rate.cell_log;
1237         if (slot > 255)
1238                 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1239         return rtab->data[slot];
1240 }
1241 
1242 struct psched_ratecfg {
1243         u64     rate_bytes_ps; /* bytes per second */
1244         u32     mult;
1245         u16     overhead;
1246         u8      linklayer;
1247         u8      shift;
1248 };
1249 
1250 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1251                                 unsigned int len)
1252 {
1253         len += r->overhead;
1254 
1255         if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1256                 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1257 
1258         return ((u64)len * r->mult) >> r->shift;
1259 }
1260 
1261 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1262                                const struct tc_ratespec *conf,
1263                                u64 rate64);
1264 
1265 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1266                                           const struct psched_ratecfg *r)
1267 {
1268         memset(res, 0, sizeof(*res));
1269 
1270         /* legacy struct tc_ratespec has a 32bit @rate field
1271          * Qdisc using 64bit rate should add new attributes
1272          * in order to maintain compatibility.
1273          */
1274         res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1275 
1276         res->overhead = r->overhead;
1277         res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1278 }
1279 
1280 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1281  * The fast path only needs to access filter list and to update stats
1282  */
1283 struct mini_Qdisc {
1284         struct tcf_proto *filter_list;
1285         struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1286         struct gnet_stats_queue __percpu *cpu_qstats;
1287         struct rcu_head rcu;
1288 };
1289 
1290 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1291                                                 const struct sk_buff *skb)
1292 {
1293         bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1294 }
1295 
1296 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1297 {
1298         this_cpu_inc(miniq->cpu_qstats->drops);
1299 }
1300 
1301 struct mini_Qdisc_pair {
1302         struct mini_Qdisc miniq1;
1303         struct mini_Qdisc miniq2;
1304         struct mini_Qdisc __rcu **p_miniq;
1305 };
1306 
1307 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1308                           struct tcf_proto *tp_head);
1309 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1310                           struct mini_Qdisc __rcu **p_miniq);
1311 
1312 static inline void skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res)
1313 {
1314         struct gnet_stats_queue *stats = res->qstats;
1315         int ret;
1316 
1317         if (res->ingress)
1318                 ret = netif_receive_skb(skb);
1319         else
1320                 ret = dev_queue_xmit(skb);
1321         if (ret && stats)
1322                 qstats_overlimit_inc(res->qstats);
1323 }
1324 
1325 #endif
1326 

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