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 <linux/rwsem.h>
17#include <linux/atomic.h>
18#include <linux/hashtable.h>
19#include <net/gen_stats.h>
20#include <net/rtnetlink.h>
21#include <net/flow_offload.h>
22#include <linux/xarray.h>
23
24struct Qdisc_ops;
25struct qdisc_walker;
26struct tcf_walker;
27struct module;
28struct bpf_flow_keys;
29
30struct qdisc_rate_table {
31 struct tc_ratespec rate;
32 u32 data[256];
33 struct qdisc_rate_table *next;
34 int refcnt;
35};
36
37enum qdisc_state_t {
38 __QDISC_STATE_SCHED,
39 __QDISC_STATE_DEACTIVATED,
40 __QDISC_STATE_MISSED,
41 __QDISC_STATE_DRAINING,
42};
43
44enum qdisc_state2_t {
45 /* Only for !TCQ_F_NOLOCK qdisc. Never access it directly.
46 * Use qdisc_run_begin/end() or qdisc_is_running() instead.
47 */
48 __QDISC_STATE2_RUNNING,
49};
50
51#define QDISC_STATE_MISSED BIT(__QDISC_STATE_MISSED)
52#define QDISC_STATE_DRAINING BIT(__QDISC_STATE_DRAINING)
53
54#define QDISC_STATE_NON_EMPTY (QDISC_STATE_MISSED | \
55 QDISC_STATE_DRAINING)
56
57struct qdisc_size_table {
58 struct rcu_head rcu;
59 struct list_head list;
60 struct tc_sizespec szopts;
61 int refcnt;
62 u16 data[];
63};
64
65/* similar to sk_buff_head, but skb->prev pointer is undefined. */
66struct qdisc_skb_head {
67 struct sk_buff *head;
68 struct sk_buff *tail;
69 __u32 qlen;
70 spinlock_t lock;
71};
72
73struct Qdisc {
74 int (*enqueue)(struct sk_buff *skb,
75 struct Qdisc *sch,
76 struct sk_buff **to_free);
77 struct sk_buff * (*dequeue)(struct Qdisc *sch);
78 unsigned int flags;
79#define TCQ_F_BUILTIN 1
80#define TCQ_F_INGRESS 2
81#define TCQ_F_CAN_BYPASS 4
82#define TCQ_F_MQROOT 8
83#define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
84 * q->dev_queue : It can test
85 * netif_xmit_frozen_or_stopped() before
86 * dequeueing next packet.
87 * Its true for MQ/MQPRIO slaves, or non
88 * multiqueue device.
89 */
90#define TCQ_F_WARN_NONWC (1 << 16)
91#define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
92#define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
93 * qdisc_tree_decrease_qlen() should stop.
94 */
95#define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
96#define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
97#define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
98 u32 limit;
99 const struct Qdisc_ops *ops;
100 struct qdisc_size_table __rcu *stab;
101 struct hlist_node hash;
102 u32 handle;
103 u32 parent;
104
105 struct netdev_queue *dev_queue;
106
107 struct net_rate_estimator __rcu *rate_est;
108 struct gnet_stats_basic_sync __percpu *cpu_bstats;
109 struct gnet_stats_queue __percpu *cpu_qstats;
110 int pad;
111 refcount_t refcnt;
112
113 /*
114 * For performance sake on SMP, we put highly modified fields at the end
115 */
116 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
117 struct qdisc_skb_head q;
118 struct gnet_stats_basic_sync bstats;
119 struct gnet_stats_queue qstats;
120 int owner;
121 unsigned long state;
122 unsigned long state2; /* must be written under qdisc spinlock */
123 struct Qdisc *next_sched;
124 struct sk_buff_head skb_bad_txq;
125
126 spinlock_t busylock ____cacheline_aligned_in_smp;
127 spinlock_t seqlock;
128
129 struct rcu_head rcu;
130 netdevice_tracker dev_tracker;
131 struct lock_class_key root_lock_key;
132 /* private data */
133 long privdata[] ____cacheline_aligned;
134};
135
136static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
137{
138 if (qdisc->flags & TCQ_F_BUILTIN)
139 return;
140 refcount_inc(r: &qdisc->refcnt);
141}
142
143static inline bool qdisc_refcount_dec_if_one(struct Qdisc *qdisc)
144{
145 if (qdisc->flags & TCQ_F_BUILTIN)
146 return true;
147 return refcount_dec_if_one(r: &qdisc->refcnt);
148}
149
150/* Intended to be used by unlocked users, when concurrent qdisc release is
151 * possible.
152 */
153
154static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
155{
156 if (qdisc->flags & TCQ_F_BUILTIN)
157 return qdisc;
158 if (refcount_inc_not_zero(r: &qdisc->refcnt))
159 return qdisc;
160 return NULL;
161}
162
163/* For !TCQ_F_NOLOCK qdisc: callers must either call this within a qdisc
164 * root_lock section, or provide their own memory barriers -- ordering
165 * against qdisc_run_begin/end() atomic bit operations.
166 */
167static inline bool qdisc_is_running(struct Qdisc *qdisc)
168{
169 if (qdisc->flags & TCQ_F_NOLOCK)
170 return spin_is_locked(lock: &qdisc->seqlock);
171 return test_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
172}
173
174static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc)
175{
176 return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY);
177}
178
179static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
180{
181 return q->flags & TCQ_F_CPUSTATS;
182}
183
184static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
185{
186 if (qdisc_is_percpu_stats(q: qdisc))
187 return nolock_qdisc_is_empty(qdisc);
188 return !READ_ONCE(qdisc->q.qlen);
189}
190
191/* For !TCQ_F_NOLOCK qdisc, qdisc_run_begin/end() must be invoked with
192 * the qdisc root lock acquired.
193 */
194static inline bool qdisc_run_begin(struct Qdisc *qdisc)
195{
196 if (qdisc->flags & TCQ_F_NOLOCK) {
197 if (spin_trylock(lock: &qdisc->seqlock))
198 return true;
199
200 /* No need to insist if the MISSED flag was already set.
201 * Note that test_and_set_bit() also gives us memory ordering
202 * guarantees wrt potential earlier enqueue() and below
203 * spin_trylock(), both of which are necessary to prevent races
204 */
205 if (test_and_set_bit(nr: __QDISC_STATE_MISSED, addr: &qdisc->state))
206 return false;
207
208 /* Try to take the lock again to make sure that we will either
209 * grab it or the CPU that still has it will see MISSED set
210 * when testing it in qdisc_run_end()
211 */
212 return spin_trylock(lock: &qdisc->seqlock);
213 }
214 return !__test_and_set_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
215}
216
217static inline void qdisc_run_end(struct Qdisc *qdisc)
218{
219 if (qdisc->flags & TCQ_F_NOLOCK) {
220 spin_unlock(lock: &qdisc->seqlock);
221
222 /* spin_unlock() only has store-release semantic. The unlock
223 * and test_bit() ordering is a store-load ordering, so a full
224 * memory barrier is needed here.
225 */
226 smp_mb();
227
228 if (unlikely(test_bit(__QDISC_STATE_MISSED,
229 &qdisc->state)))
230 __netif_schedule(q: qdisc);
231 } else {
232 __clear_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
233 }
234}
235
236static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
237{
238 return qdisc->flags & TCQ_F_ONETXQUEUE;
239}
240
241static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
242{
243 return netdev_queue_dql_avail(txq);
244}
245
246struct Qdisc_class_ops {
247 unsigned int flags;
248 /* Child qdisc manipulation */
249 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
250 int (*graft)(struct Qdisc *, unsigned long cl,
251 struct Qdisc *, struct Qdisc **,
252 struct netlink_ext_ack *extack);
253 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
254 void (*qlen_notify)(struct Qdisc *, unsigned long);
255
256 /* Class manipulation routines */
257 unsigned long (*find)(struct Qdisc *, u32 classid);
258 int (*change)(struct Qdisc *, u32, u32,
259 struct nlattr **, unsigned long *,
260 struct netlink_ext_ack *);
261 int (*delete)(struct Qdisc *, unsigned long,
262 struct netlink_ext_ack *);
263 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
264
265 /* Filter manipulation */
266 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
267 unsigned long arg,
268 struct netlink_ext_ack *extack);
269 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
270 u32 classid);
271 void (*unbind_tcf)(struct Qdisc *, unsigned long);
272
273 /* rtnetlink specific */
274 int (*dump)(struct Qdisc *, unsigned long,
275 struct sk_buff *skb, struct tcmsg*);
276 int (*dump_stats)(struct Qdisc *, unsigned long,
277 struct gnet_dump *);
278};
279
280/* Qdisc_class_ops flag values */
281
282/* Implements API that doesn't require rtnl lock */
283enum qdisc_class_ops_flags {
284 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
285};
286
287struct Qdisc_ops {
288 struct Qdisc_ops *next;
289 const struct Qdisc_class_ops *cl_ops;
290 char id[IFNAMSIZ];
291 int priv_size;
292 unsigned int static_flags;
293
294 int (*enqueue)(struct sk_buff *skb,
295 struct Qdisc *sch,
296 struct sk_buff **to_free);
297 struct sk_buff * (*dequeue)(struct Qdisc *);
298 struct sk_buff * (*peek)(struct Qdisc *);
299
300 int (*init)(struct Qdisc *sch, struct nlattr *arg,
301 struct netlink_ext_ack *extack);
302 void (*reset)(struct Qdisc *);
303 void (*destroy)(struct Qdisc *);
304 int (*change)(struct Qdisc *sch,
305 struct nlattr *arg,
306 struct netlink_ext_ack *extack);
307 void (*attach)(struct Qdisc *sch);
308 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
309 void (*change_real_num_tx)(struct Qdisc *sch,
310 unsigned int new_real_tx);
311
312 int (*dump)(struct Qdisc *, struct sk_buff *);
313 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
314
315 void (*ingress_block_set)(struct Qdisc *sch,
316 u32 block_index);
317 void (*egress_block_set)(struct Qdisc *sch,
318 u32 block_index);
319 u32 (*ingress_block_get)(struct Qdisc *sch);
320 u32 (*egress_block_get)(struct Qdisc *sch);
321
322 struct module *owner;
323};
324
325struct tcf_result {
326 union {
327 struct {
328 unsigned long class;
329 u32 classid;
330 };
331 const struct tcf_proto *goto_tp;
332 };
333};
334
335struct tcf_chain;
336
337struct tcf_proto_ops {
338 struct list_head head;
339 char kind[IFNAMSIZ];
340
341 int (*classify)(struct sk_buff *,
342 const struct tcf_proto *,
343 struct tcf_result *);
344 int (*init)(struct tcf_proto*);
345 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
346 struct netlink_ext_ack *extack);
347
348 void* (*get)(struct tcf_proto*, u32 handle);
349 void (*put)(struct tcf_proto *tp, void *f);
350 int (*change)(struct net *net, struct sk_buff *,
351 struct tcf_proto*, unsigned long,
352 u32 handle, struct nlattr **,
353 void **, u32,
354 struct netlink_ext_ack *);
355 int (*delete)(struct tcf_proto *tp, void *arg,
356 bool *last, bool rtnl_held,
357 struct netlink_ext_ack *);
358 bool (*delete_empty)(struct tcf_proto *tp);
359 void (*walk)(struct tcf_proto *tp,
360 struct tcf_walker *arg, bool rtnl_held);
361 int (*reoffload)(struct tcf_proto *tp, bool add,
362 flow_setup_cb_t *cb, void *cb_priv,
363 struct netlink_ext_ack *extack);
364 void (*hw_add)(struct tcf_proto *tp,
365 void *type_data);
366 void (*hw_del)(struct tcf_proto *tp,
367 void *type_data);
368 void (*bind_class)(void *, u32, unsigned long,
369 void *, unsigned long);
370 void * (*tmplt_create)(struct net *net,
371 struct tcf_chain *chain,
372 struct nlattr **tca,
373 struct netlink_ext_ack *extack);
374 void (*tmplt_destroy)(void *tmplt_priv);
375 void (*tmplt_reoffload)(struct tcf_chain *chain,
376 bool add,
377 flow_setup_cb_t *cb,
378 void *cb_priv);
379 struct tcf_exts * (*get_exts)(const struct tcf_proto *tp,
380 u32 handle);
381
382 /* rtnetlink specific */
383 int (*dump)(struct net*, struct tcf_proto*, void *,
384 struct sk_buff *skb, struct tcmsg*,
385 bool);
386 int (*terse_dump)(struct net *net,
387 struct tcf_proto *tp, void *fh,
388 struct sk_buff *skb,
389 struct tcmsg *t, bool rtnl_held);
390 int (*tmplt_dump)(struct sk_buff *skb,
391 struct net *net,
392 void *tmplt_priv);
393
394 struct module *owner;
395 int flags;
396};
397
398/* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
399 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
400 * conditions can occur when filters are inserted/deleted simultaneously.
401 */
402enum tcf_proto_ops_flags {
403 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
404};
405
406struct tcf_proto {
407 /* Fast access part */
408 struct tcf_proto __rcu *next;
409 void __rcu *root;
410
411 /* called under RCU BH lock*/
412 int (*classify)(struct sk_buff *,
413 const struct tcf_proto *,
414 struct tcf_result *);
415 __be16 protocol;
416
417 /* All the rest */
418 u32 prio;
419 void *data;
420 const struct tcf_proto_ops *ops;
421 struct tcf_chain *chain;
422 /* Lock protects tcf_proto shared state and can be used by unlocked
423 * classifiers to protect their private data.
424 */
425 spinlock_t lock;
426 bool deleting;
427 bool counted;
428 bool usesw;
429 refcount_t refcnt;
430 struct rcu_head rcu;
431 struct hlist_node destroy_ht_node;
432};
433
434struct qdisc_skb_cb {
435 struct {
436 unsigned int pkt_len;
437 u16 slave_dev_queue_mapping;
438 u16 tc_classid;
439 };
440#define QDISC_CB_PRIV_LEN 20
441 unsigned char data[QDISC_CB_PRIV_LEN];
442};
443
444typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
445
446struct tcf_chain {
447 /* Protects filter_chain. */
448 struct mutex filter_chain_lock;
449 struct tcf_proto __rcu *filter_chain;
450 struct list_head list;
451 struct tcf_block *block;
452 u32 index; /* chain index */
453 unsigned int refcnt;
454 unsigned int action_refcnt;
455 bool explicitly_created;
456 bool flushing;
457 const struct tcf_proto_ops *tmplt_ops;
458 void *tmplt_priv;
459 struct rcu_head rcu;
460};
461
462struct tcf_block {
463 struct xarray ports; /* datapath accessible */
464 /* Lock protects tcf_block and lifetime-management data of chains
465 * attached to the block (refcnt, action_refcnt, explicitly_created).
466 */
467 struct mutex lock;
468 struct list_head chain_list;
469 u32 index; /* block index for shared blocks */
470 u32 classid; /* which class this block belongs to */
471 refcount_t refcnt;
472 struct net *net;
473 struct Qdisc *q;
474 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
475 struct flow_block flow_block;
476 struct list_head owner_list;
477 bool keep_dst;
478 atomic_t useswcnt;
479 atomic_t offloadcnt; /* Number of oddloaded filters */
480 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
481 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
482 struct {
483 struct tcf_chain *chain;
484 struct list_head filter_chain_list;
485 } chain0;
486 struct rcu_head rcu;
487 DECLARE_HASHTABLE(proto_destroy_ht, 7);
488 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
489};
490
491struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index);
492
493static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
494{
495 return lockdep_is_held(&chain->filter_chain_lock);
496}
497
498static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
499{
500 return lockdep_is_held(&tp->lock);
501}
502
503#define tcf_chain_dereference(p, chain) \
504 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
505
506#define tcf_proto_dereference(p, tp) \
507 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
508
509static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
510{
511 struct qdisc_skb_cb *qcb;
512
513 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb));
514 BUILD_BUG_ON(sizeof(qcb->data) < sz);
515}
516
517static inline int qdisc_qlen(const struct Qdisc *q)
518{
519 return q->q.qlen;
520}
521
522static inline int qdisc_qlen_sum(const struct Qdisc *q)
523{
524 __u32 qlen = q->qstats.qlen;
525 int i;
526
527 if (qdisc_is_percpu_stats(q)) {
528 for_each_possible_cpu(i)
529 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
530 } else {
531 qlen += q->q.qlen;
532 }
533
534 return qlen;
535}
536
537static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
538{
539 return (struct qdisc_skb_cb *)skb->cb;
540}
541
542static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
543{
544 return &qdisc->q.lock;
545}
546
547static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
548{
549 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
550
551 return q;
552}
553
554static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
555{
556 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
557}
558
559static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
560{
561 return rcu_dereference_rtnl(qdisc->dev_queue->qdisc_sleeping);
562}
563
564static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
565{
566 struct Qdisc *root = qdisc_root_sleeping(qdisc);
567
568 ASSERT_RTNL();
569 return qdisc_lock(qdisc: root);
570}
571
572static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
573{
574 return qdisc->dev_queue->dev;
575}
576
577static inline void sch_tree_lock(struct Qdisc *q)
578{
579 if (q->flags & TCQ_F_MQROOT)
580 spin_lock_bh(lock: qdisc_lock(qdisc: q));
581 else
582 spin_lock_bh(lock: qdisc_root_sleeping_lock(qdisc: q));
583}
584
585static inline void sch_tree_unlock(struct Qdisc *q)
586{
587 if (q->flags & TCQ_F_MQROOT)
588 spin_unlock_bh(lock: qdisc_lock(qdisc: q));
589 else
590 spin_unlock_bh(lock: qdisc_root_sleeping_lock(qdisc: q));
591}
592
593extern struct Qdisc noop_qdisc;
594extern struct Qdisc_ops noop_qdisc_ops;
595extern struct Qdisc_ops pfifo_fast_ops;
596extern const u8 sch_default_prio2band[TC_PRIO_MAX + 1];
597extern struct Qdisc_ops mq_qdisc_ops;
598extern struct Qdisc_ops noqueue_qdisc_ops;
599extern const struct Qdisc_ops *default_qdisc_ops;
600static inline const struct Qdisc_ops *
601get_default_qdisc_ops(const struct net_device *dev, int ntx)
602{
603 return ntx < dev->real_num_tx_queues ?
604 default_qdisc_ops : &pfifo_fast_ops;
605}
606
607struct Qdisc_class_common {
608 u32 classid;
609 unsigned int filter_cnt;
610 struct hlist_node hnode;
611};
612
613struct Qdisc_class_hash {
614 struct hlist_head *hash;
615 unsigned int hashsize;
616 unsigned int hashmask;
617 unsigned int hashelems;
618};
619
620static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
621{
622 id ^= id >> 8;
623 id ^= id >> 4;
624 return id & mask;
625}
626
627static inline struct Qdisc_class_common *
628qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
629{
630 struct Qdisc_class_common *cl;
631 unsigned int h;
632
633 if (!id)
634 return NULL;
635
636 h = qdisc_class_hash(id, mask: hash->hashmask);
637 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
638 if (cl->classid == id)
639 return cl;
640 }
641 return NULL;
642}
643
644static inline bool qdisc_class_in_use(const struct Qdisc_class_common *cl)
645{
646 return cl->filter_cnt > 0;
647}
648
649static inline void qdisc_class_get(struct Qdisc_class_common *cl)
650{
651 unsigned int res;
652
653 if (check_add_overflow(cl->filter_cnt, 1, &res))
654 WARN(1, "Qdisc class overflow");
655
656 cl->filter_cnt = res;
657}
658
659static inline void qdisc_class_put(struct Qdisc_class_common *cl)
660{
661 unsigned int res;
662
663 if (check_sub_overflow(cl->filter_cnt, 1, &res))
664 WARN(1, "Qdisc class underflow");
665
666 cl->filter_cnt = res;
667}
668
669static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
670{
671 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
672
673 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
674}
675
676int qdisc_class_hash_init(struct Qdisc_class_hash *);
677void qdisc_class_hash_insert(struct Qdisc_class_hash *,
678 struct Qdisc_class_common *);
679void qdisc_class_hash_remove(struct Qdisc_class_hash *,
680 struct Qdisc_class_common *);
681void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
682void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
683
684int dev_qdisc_change_tx_queue_len(struct net_device *dev);
685void dev_qdisc_change_real_num_tx(struct net_device *dev,
686 unsigned int new_real_tx);
687void dev_init_scheduler(struct net_device *dev);
688void dev_shutdown(struct net_device *dev);
689void dev_activate(struct net_device *dev);
690void dev_deactivate(struct net_device *dev);
691void dev_deactivate_many(struct list_head *head);
692struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
693 struct Qdisc *qdisc);
694void qdisc_reset(struct Qdisc *qdisc);
695void qdisc_destroy(struct Qdisc *qdisc);
696void qdisc_put(struct Qdisc *qdisc);
697void qdisc_put_unlocked(struct Qdisc *qdisc);
698void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
699#ifdef CONFIG_NET_SCHED
700int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
701 void *type_data);
702void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
703 struct Qdisc *new, struct Qdisc *old,
704 enum tc_setup_type type, void *type_data,
705 struct netlink_ext_ack *extack);
706#else
707static inline int
708qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
709 void *type_data)
710{
711 q->flags &= ~TCQ_F_OFFLOADED;
712 return 0;
713}
714
715static inline void
716qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
717 struct Qdisc *new, struct Qdisc *old,
718 enum tc_setup_type type, void *type_data,
719 struct netlink_ext_ack *extack)
720{
721}
722#endif
723void qdisc_offload_query_caps(struct net_device *dev,
724 enum tc_setup_type type,
725 void *caps, size_t caps_len);
726struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
727 const struct Qdisc_ops *ops,
728 struct netlink_ext_ack *extack);
729void qdisc_free(struct Qdisc *qdisc);
730struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
731 const struct Qdisc_ops *ops, u32 parentid,
732 struct netlink_ext_ack *extack);
733void __qdisc_calculate_pkt_len(struct sk_buff *skb,
734 const struct qdisc_size_table *stab);
735int skb_do_redirect(struct sk_buff *);
736
737static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
738{
739#ifdef CONFIG_NET_XGRESS
740 return skb->tc_at_ingress;
741#else
742 return false;
743#endif
744}
745
746static inline bool skb_skip_tc_classify(struct sk_buff *skb)
747{
748#ifdef CONFIG_NET_CLS_ACT
749 if (skb->tc_skip_classify) {
750 skb->tc_skip_classify = 0;
751 return true;
752 }
753#endif
754 return false;
755}
756
757/* Reset all TX qdiscs greater than index of a device. */
758static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
759{
760 struct Qdisc *qdisc;
761
762 for (; i < dev->num_tx_queues; i++) {
763 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
764 if (qdisc) {
765 spin_lock_bh(lock: qdisc_lock(qdisc));
766 qdisc_reset(qdisc);
767 spin_unlock_bh(lock: qdisc_lock(qdisc));
768 }
769 }
770}
771
772/* Are all TX queues of the device empty? */
773static inline bool qdisc_all_tx_empty(const struct net_device *dev)
774{
775 unsigned int i;
776
777 rcu_read_lock();
778 for (i = 0; i < dev->num_tx_queues; i++) {
779 struct netdev_queue *txq = netdev_get_tx_queue(dev, index: i);
780 const struct Qdisc *q = rcu_dereference(txq->qdisc);
781
782 if (!qdisc_is_empty(qdisc: q)) {
783 rcu_read_unlock();
784 return false;
785 }
786 }
787 rcu_read_unlock();
788 return true;
789}
790
791/* Are any of the TX qdiscs changing? */
792static inline bool qdisc_tx_changing(const struct net_device *dev)
793{
794 unsigned int i;
795
796 for (i = 0; i < dev->num_tx_queues; i++) {
797 struct netdev_queue *txq = netdev_get_tx_queue(dev, index: i);
798
799 if (rcu_access_pointer(txq->qdisc) !=
800 rcu_access_pointer(txq->qdisc_sleeping))
801 return true;
802 }
803 return false;
804}
805
806/* "noqueue" qdisc identified by not having any enqueue, see noqueue_init() */
807static inline bool qdisc_txq_has_no_queue(const struct netdev_queue *txq)
808{
809 struct Qdisc *qdisc = rcu_access_pointer(txq->qdisc);
810
811 return qdisc->enqueue == NULL;
812}
813
814/* Is the device using the noop qdisc on all queues? */
815static inline bool qdisc_tx_is_noop(const struct net_device *dev)
816{
817 unsigned int i;
818
819 for (i = 0; i < dev->num_tx_queues; i++) {
820 struct netdev_queue *txq = netdev_get_tx_queue(dev, index: i);
821 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
822 return false;
823 }
824 return true;
825}
826
827static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
828{
829 return qdisc_skb_cb(skb)->pkt_len;
830}
831
832/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
833enum net_xmit_qdisc_t {
834 __NET_XMIT_STOLEN = 0x00010000,
835 __NET_XMIT_BYPASS = 0x00020000,
836};
837
838#ifdef CONFIG_NET_CLS_ACT
839#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
840#else
841#define net_xmit_drop_count(e) (1)
842#endif
843
844static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
845 const struct Qdisc *sch)
846{
847#ifdef CONFIG_NET_SCHED
848 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
849
850 if (stab)
851 __qdisc_calculate_pkt_len(skb, stab);
852#endif
853}
854
855static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
856 struct sk_buff **to_free)
857{
858 return sch->enqueue(skb, sch, to_free);
859}
860
861static inline void _bstats_update(struct gnet_stats_basic_sync *bstats,
862 __u64 bytes, __u64 packets)
863{
864 u64_stats_update_begin(syncp: &bstats->syncp);
865 u64_stats_add(p: &bstats->bytes, val: bytes);
866 u64_stats_add(p: &bstats->packets, val: packets);
867 u64_stats_update_end(syncp: &bstats->syncp);
868}
869
870static inline void bstats_update(struct gnet_stats_basic_sync *bstats,
871 const struct sk_buff *skb)
872{
873 _bstats_update(bstats,
874 bytes: qdisc_pkt_len(skb),
875 packets: skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
876}
877
878static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
879 const struct sk_buff *skb)
880{
881 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb);
882}
883
884static inline void qdisc_bstats_update(struct Qdisc *sch,
885 const struct sk_buff *skb)
886{
887 bstats_update(bstats: &sch->bstats, skb);
888}
889
890static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
891 const struct sk_buff *skb)
892{
893 sch->qstats.backlog -= qdisc_pkt_len(skb);
894}
895
896static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
897 const struct sk_buff *skb)
898{
899 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
900}
901
902static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
903 const struct sk_buff *skb)
904{
905 sch->qstats.backlog += qdisc_pkt_len(skb);
906}
907
908static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
909 const struct sk_buff *skb)
910{
911 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
912}
913
914static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
915{
916 this_cpu_inc(sch->cpu_qstats->qlen);
917}
918
919static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
920{
921 this_cpu_dec(sch->cpu_qstats->qlen);
922}
923
924static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
925{
926 this_cpu_inc(sch->cpu_qstats->requeues);
927}
928
929static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
930{
931 sch->qstats.drops += count;
932}
933
934static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
935{
936 qstats->drops++;
937}
938
939static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
940{
941 qstats->overlimits++;
942}
943
944static inline void qdisc_qstats_drop(struct Qdisc *sch)
945{
946 qstats_drop_inc(qstats: &sch->qstats);
947}
948
949static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
950{
951 this_cpu_inc(sch->cpu_qstats->drops);
952}
953
954static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
955{
956 sch->qstats.overlimits++;
957}
958
959static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
960{
961 __u32 qlen = qdisc_qlen_sum(q: sch);
962
963 return gnet_stats_copy_queue(d, cpu_q: sch->cpu_qstats, q: &sch->qstats, qlen);
964}
965
966static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
967 __u32 *backlog)
968{
969 struct gnet_stats_queue qstats = { 0 };
970
971 gnet_stats_add_queue(qstats: &qstats, cpu_q: sch->cpu_qstats, q: &sch->qstats);
972 *qlen = qstats.qlen + qdisc_qlen(q: sch);
973 *backlog = qstats.backlog;
974}
975
976static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
977{
978 __u32 qlen, backlog;
979
980 qdisc_qstats_qlen_backlog(sch, qlen: &qlen, backlog: &backlog);
981 qdisc_tree_reduce_backlog(qdisc: sch, n: qlen, len: backlog);
982}
983
984static inline void qdisc_purge_queue(struct Qdisc *sch)
985{
986 __u32 qlen, backlog;
987
988 qdisc_qstats_qlen_backlog(sch, qlen: &qlen, backlog: &backlog);
989 qdisc_reset(qdisc: sch);
990 qdisc_tree_reduce_backlog(qdisc: sch, n: qlen, len: backlog);
991}
992
993static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
994 struct qdisc_skb_head *qh)
995{
996 struct sk_buff *last = qh->tail;
997
998 if (last) {
999 skb->next = NULL;
1000 last->next = skb;
1001 qh->tail = skb;
1002 } else {
1003 qh->tail = skb;
1004 qh->head = skb;
1005 }
1006 qh->qlen++;
1007}
1008
1009static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
1010{
1011 __qdisc_enqueue_tail(skb, qh: &sch->q);
1012 qdisc_qstats_backlog_inc(sch, skb);
1013 return NET_XMIT_SUCCESS;
1014}
1015
1016static inline void __qdisc_enqueue_head(struct sk_buff *skb,
1017 struct qdisc_skb_head *qh)
1018{
1019 skb->next = qh->head;
1020
1021 if (!qh->head)
1022 qh->tail = skb;
1023 qh->head = skb;
1024 qh->qlen++;
1025}
1026
1027static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
1028{
1029 struct sk_buff *skb = qh->head;
1030
1031 if (likely(skb != NULL)) {
1032 qh->head = skb->next;
1033 qh->qlen--;
1034 if (qh->head == NULL)
1035 qh->tail = NULL;
1036 skb->next = NULL;
1037 }
1038
1039 return skb;
1040}
1041
1042static inline struct sk_buff *qdisc_dequeue_internal(struct Qdisc *sch, bool direct)
1043{
1044 struct sk_buff *skb;
1045
1046 skb = __skb_dequeue(list: &sch->gso_skb);
1047 if (skb) {
1048 sch->q.qlen--;
1049 return skb;
1050 }
1051 if (direct)
1052 return __qdisc_dequeue_head(qh: &sch->q);
1053 else
1054 return sch->dequeue(sch);
1055}
1056
1057static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1058{
1059 struct sk_buff *skb = __qdisc_dequeue_head(qh: &sch->q);
1060
1061 if (likely(skb != NULL)) {
1062 qdisc_qstats_backlog_dec(sch, skb);
1063 qdisc_bstats_update(sch, skb);
1064 }
1065
1066 return skb;
1067}
1068
1069struct tc_skb_cb {
1070 struct qdisc_skb_cb qdisc_cb;
1071 u32 drop_reason;
1072
1073 u16 zone; /* Only valid if post_ct = true */
1074 u16 mru;
1075 u8 post_ct:1;
1076 u8 post_ct_snat:1;
1077 u8 post_ct_dnat:1;
1078};
1079
1080static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb)
1081{
1082 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb;
1083
1084 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb));
1085 return cb;
1086}
1087
1088static inline enum skb_drop_reason
1089tcf_get_drop_reason(const struct sk_buff *skb)
1090{
1091 return tc_skb_cb(skb)->drop_reason;
1092}
1093
1094static inline void tcf_set_drop_reason(const struct sk_buff *skb,
1095 enum skb_drop_reason reason)
1096{
1097 tc_skb_cb(skb)->drop_reason = reason;
1098}
1099
1100/* Instead of calling kfree_skb() while root qdisc lock is held,
1101 * queue the skb for future freeing at end of __dev_xmit_skb()
1102 */
1103static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1104{
1105 skb->next = *to_free;
1106 *to_free = skb;
1107}
1108
1109static inline void __qdisc_drop_all(struct sk_buff *skb,
1110 struct sk_buff **to_free)
1111{
1112 if (skb->prev)
1113 skb->prev->next = *to_free;
1114 else
1115 skb->next = *to_free;
1116 *to_free = skb;
1117}
1118
1119static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1120 struct qdisc_skb_head *qh,
1121 struct sk_buff **to_free)
1122{
1123 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1124
1125 if (likely(skb != NULL)) {
1126 unsigned int len = qdisc_pkt_len(skb);
1127
1128 qdisc_qstats_backlog_dec(sch, skb);
1129 __qdisc_drop(skb, to_free);
1130 return len;
1131 }
1132
1133 return 0;
1134}
1135
1136static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1137{
1138 const struct qdisc_skb_head *qh = &sch->q;
1139
1140 return qh->head;
1141}
1142
1143/* generic pseudo peek method for non-work-conserving qdisc */
1144static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1145{
1146 struct sk_buff *skb = skb_peek(list_: &sch->gso_skb);
1147
1148 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1149 if (!skb) {
1150 skb = sch->dequeue(sch);
1151
1152 if (skb) {
1153 __skb_queue_head(list: &sch->gso_skb, newsk: skb);
1154 /* it's still part of the queue */
1155 qdisc_qstats_backlog_inc(sch, skb);
1156 sch->q.qlen++;
1157 }
1158 }
1159
1160 return skb;
1161}
1162
1163static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1164 struct sk_buff *skb)
1165{
1166 if (qdisc_is_percpu_stats(q: sch)) {
1167 qdisc_qstats_cpu_backlog_dec(sch, skb);
1168 qdisc_bstats_cpu_update(sch, skb);
1169 qdisc_qstats_cpu_qlen_dec(sch);
1170 } else {
1171 qdisc_qstats_backlog_dec(sch, skb);
1172 qdisc_bstats_update(sch, skb);
1173 sch->q.qlen--;
1174 }
1175}
1176
1177static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1178 unsigned int pkt_len)
1179{
1180 if (qdisc_is_percpu_stats(q: sch)) {
1181 qdisc_qstats_cpu_qlen_inc(sch);
1182 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1183 } else {
1184 sch->qstats.backlog += pkt_len;
1185 sch->q.qlen++;
1186 }
1187}
1188
1189/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1190static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1191{
1192 struct sk_buff *skb = skb_peek(list_: &sch->gso_skb);
1193
1194 if (skb) {
1195 skb = __skb_dequeue(list: &sch->gso_skb);
1196 if (qdisc_is_percpu_stats(q: sch)) {
1197 qdisc_qstats_cpu_backlog_dec(sch, skb);
1198 qdisc_qstats_cpu_qlen_dec(sch);
1199 } else {
1200 qdisc_qstats_backlog_dec(sch, skb);
1201 sch->q.qlen--;
1202 }
1203 } else {
1204 skb = sch->dequeue(sch);
1205 }
1206
1207 return skb;
1208}
1209
1210static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1211{
1212 /*
1213 * We do not know the backlog in bytes of this list, it
1214 * is up to the caller to correct it
1215 */
1216 ASSERT_RTNL();
1217 if (qh->qlen) {
1218 rtnl_kfree_skbs(head: qh->head, tail: qh->tail);
1219
1220 qh->head = NULL;
1221 qh->tail = NULL;
1222 qh->qlen = 0;
1223 }
1224}
1225
1226static inline void qdisc_reset_queue(struct Qdisc *sch)
1227{
1228 __qdisc_reset_queue(qh: &sch->q);
1229}
1230
1231static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1232 struct Qdisc **pold)
1233{
1234 struct Qdisc *old;
1235
1236 sch_tree_lock(q: sch);
1237 old = *pold;
1238 *pold = new;
1239 if (old != NULL)
1240 qdisc_purge_queue(sch: old);
1241 sch_tree_unlock(q: sch);
1242
1243 return old;
1244}
1245
1246static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1247{
1248 rtnl_kfree_skbs(head: skb, tail: skb);
1249 qdisc_qstats_drop(sch);
1250}
1251
1252static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1253 struct sk_buff **to_free)
1254{
1255 __qdisc_drop(skb, to_free);
1256 qdisc_qstats_cpu_drop(sch);
1257
1258 return NET_XMIT_DROP;
1259}
1260
1261static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1262 struct sk_buff **to_free)
1263{
1264 __qdisc_drop(skb, to_free);
1265 qdisc_qstats_drop(sch);
1266
1267 return NET_XMIT_DROP;
1268}
1269
1270static inline int qdisc_drop_reason(struct sk_buff *skb, struct Qdisc *sch,
1271 struct sk_buff **to_free,
1272 enum skb_drop_reason reason)
1273{
1274 tcf_set_drop_reason(skb, reason);
1275 return qdisc_drop(skb, sch, to_free);
1276}
1277
1278static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1279 struct sk_buff **to_free)
1280{
1281 __qdisc_drop_all(skb, to_free);
1282 qdisc_qstats_drop(sch);
1283
1284 return NET_XMIT_DROP;
1285}
1286
1287struct psched_ratecfg {
1288 u64 rate_bytes_ps; /* bytes per second */
1289 u32 mult;
1290 u16 overhead;
1291 u16 mpu;
1292 u8 linklayer;
1293 u8 shift;
1294};
1295
1296static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1297 unsigned int len)
1298{
1299 len += r->overhead;
1300
1301 if (len < r->mpu)
1302 len = r->mpu;
1303
1304 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1305 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1306
1307 return ((u64)len * r->mult) >> r->shift;
1308}
1309
1310void psched_ratecfg_precompute(struct psched_ratecfg *r,
1311 const struct tc_ratespec *conf,
1312 u64 rate64);
1313
1314static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1315 const struct psched_ratecfg *r)
1316{
1317 memset(res, 0, sizeof(*res));
1318
1319 /* legacy struct tc_ratespec has a 32bit @rate field
1320 * Qdisc using 64bit rate should add new attributes
1321 * in order to maintain compatibility.
1322 */
1323 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1324
1325 res->overhead = r->overhead;
1326 res->mpu = r->mpu;
1327 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1328}
1329
1330struct psched_pktrate {
1331 u64 rate_pkts_ps; /* packets per second */
1332 u32 mult;
1333 u8 shift;
1334};
1335
1336static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r,
1337 unsigned int pkt_num)
1338{
1339 return ((u64)pkt_num * r->mult) >> r->shift;
1340}
1341
1342void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64);
1343
1344/* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1345 * The fast path only needs to access filter list and to update stats
1346 */
1347struct mini_Qdisc {
1348 struct tcf_proto *filter_list;
1349 struct tcf_block *block;
1350 struct gnet_stats_basic_sync __percpu *cpu_bstats;
1351 struct gnet_stats_queue __percpu *cpu_qstats;
1352 unsigned long rcu_state;
1353};
1354
1355static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1356 const struct sk_buff *skb)
1357{
1358 bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1359}
1360
1361static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1362{
1363 this_cpu_inc(miniq->cpu_qstats->drops);
1364}
1365
1366struct mini_Qdisc_pair {
1367 struct mini_Qdisc miniq1;
1368 struct mini_Qdisc miniq2;
1369 struct mini_Qdisc __rcu **p_miniq;
1370};
1371
1372void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1373 struct tcf_proto *tp_head);
1374void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1375 struct mini_Qdisc __rcu **p_miniq);
1376void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1377 struct tcf_block *block);
1378
1379void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx);
1380
1381int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));
1382
1383/* Make sure qdisc is no longer in SCHED state. */
1384static inline void qdisc_synchronize(const struct Qdisc *q)
1385{
1386 while (test_bit(__QDISC_STATE_SCHED, &q->state))
1387 msleep(msecs: 1);
1388}
1389
1390#endif
1391

source code of linux/include/net/sch_generic.h