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
24 struct Qdisc_ops;
25 struct qdisc_walker;
26 struct tcf_walker;
27 struct module;
28 struct bpf_flow_keys;
29
30 struct qdisc_rate_table {
31 struct tc_ratespec rate;
32 u32 data[256];
33 struct qdisc_rate_table *next;
34 int refcnt;
35 };
36
37 enum qdisc_state_t {
38 __QDISC_STATE_SCHED,
39 __QDISC_STATE_DEACTIVATED,
40 __QDISC_STATE_MISSED,
41 __QDISC_STATE_DRAINING,
42 };
43
44 enum 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
57 struct 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. */
66 struct qdisc_skb_head {
67 struct sk_buff *head;
68 struct sk_buff *tail;
69 __u32 qlen;
70 spinlock_t lock;
71 };
72
73 struct 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
136 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
137 {
138 if (qdisc->flags & TCQ_F_BUILTIN)
139 return;
140 refcount_inc(&qdisc->refcnt);
141 }
142
143 static 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(&qdisc->refcnt);
148 }
149
150 /* Intended to be used by unlocked users, when concurrent qdisc release is
151 * possible.
152 */
153
154 static 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(&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 */
167 static inline bool qdisc_is_running(struct Qdisc *qdisc)
168 {
169 if (qdisc->flags & TCQ_F_NOLOCK)
170 return spin_is_locked(&qdisc->seqlock);
171 return test_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
172 }
173
174 static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc)
175 {
176 return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY);
177 }
178
179 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
180 {
181 return q->flags & TCQ_F_CPUSTATS;
182 }
183
184 static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
185 {
186 if (qdisc_is_percpu_stats(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 */
194 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
195 {
196 if (qdisc->flags & TCQ_F_NOLOCK) {
197 if (spin_trylock(&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(__QDISC_STATE_MISSED, &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(&qdisc->seqlock);
213 }
214 return !__test_and_set_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
215 }
216
217 static inline void qdisc_run_end(struct Qdisc *qdisc)
218 {
219 if (qdisc->flags & TCQ_F_NOLOCK) {
220 spin_unlock(&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(qdisc);
231 } else {
232 __clear_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
233 }
234 }
235
236 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
237 {
238 return qdisc->flags & TCQ_F_ONETXQUEUE;
239 }
240
241 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
242 {
243 return netdev_queue_dql_avail(txq);
244 }
245
246 struct 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 */
283 enum qdisc_class_ops_flags {
284 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
285 };
286
287 struct 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
325 struct tcf_result {
326 union {
327 struct {
328 unsigned long class;
329 u32 classid;
330 };
331 const struct tcf_proto *goto_tp;
332 };
333 };
334
335 struct tcf_chain;
336
337 struct 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 */
402 enum tcf_proto_ops_flags {
403 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
404 };
405
406 struct 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 refcount_t refcnt;
429 struct rcu_head rcu;
430 struct hlist_node destroy_ht_node;
431 };
432
433 struct qdisc_skb_cb {
434 struct {
435 unsigned int pkt_len;
436 u16 slave_dev_queue_mapping;
437 u16 tc_classid;
438 };
439 #define QDISC_CB_PRIV_LEN 20
440 unsigned char data[QDISC_CB_PRIV_LEN];
441 };
442
443 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
444
445 struct tcf_chain {
446 /* Protects filter_chain. */
447 struct mutex filter_chain_lock;
448 struct tcf_proto __rcu *filter_chain;
449 struct list_head list;
450 struct tcf_block *block;
451 u32 index; /* chain index */
452 unsigned int refcnt;
453 unsigned int action_refcnt;
454 bool explicitly_created;
455 bool flushing;
456 const struct tcf_proto_ops *tmplt_ops;
457 void *tmplt_priv;
458 struct rcu_head rcu;
459 };
460
461 struct tcf_block {
462 struct xarray ports; /* datapath accessible */
463 /* Lock protects tcf_block and lifetime-management data of chains
464 * attached to the block (refcnt, action_refcnt, explicitly_created).
465 */
466 struct mutex lock;
467 struct list_head chain_list;
468 u32 index; /* block index for shared blocks */
469 u32 classid; /* which class this block belongs to */
470 refcount_t refcnt;
471 struct net *net;
472 struct Qdisc *q;
473 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
474 struct flow_block flow_block;
475 struct list_head owner_list;
476 bool keep_dst;
477 bool bypass_wanted;
478 atomic_t filtercnt; /* Number of filters */
479 atomic_t skipswcnt; /* Number of skip_sw filters */
480 atomic_t offloadcnt; /* Number of oddloaded filters */
481 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
482 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
483 struct {
484 struct tcf_chain *chain;
485 struct list_head filter_chain_list;
486 } chain0;
487 struct rcu_head rcu;
488 DECLARE_HASHTABLE(proto_destroy_ht, 7);
489 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
490 };
491
492 struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index);
493
494 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
495 {
496 return lockdep_is_held(&chain->filter_chain_lock);
497 }
498
499 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
500 {
501 return lockdep_is_held(&tp->lock);
502 }
503
504 #define tcf_chain_dereference(p, chain) \
505 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
506
507 #define tcf_proto_dereference(p, tp) \
508 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
509
510 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
511 {
512 struct qdisc_skb_cb *qcb;
513
514 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb));
515 BUILD_BUG_ON(sizeof(qcb->data) < sz);
516 }
517
518 static inline int qdisc_qlen(const struct Qdisc *q)
519 {
520 return q->q.qlen;
521 }
522
523 static inline int qdisc_qlen_sum(const struct Qdisc *q)
524 {
525 __u32 qlen = q->qstats.qlen;
526 int i;
527
528 if (qdisc_is_percpu_stats(q)) {
529 for_each_possible_cpu(i)
530 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
531 } else {
532 qlen += q->q.qlen;
533 }
534
535 return qlen;
536 }
537
538 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
539 {
540 return (struct qdisc_skb_cb *)skb->cb;
541 }
542
543 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
544 {
545 return &qdisc->q.lock;
546 }
547
548 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
549 {
550 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
551
552 return q;
553 }
554
555 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
556 {
557 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
558 }
559
560 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
561 {
562 return rcu_dereference_rtnl(qdisc->dev_queue->qdisc_sleeping);
563 }
564
565 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
566 {
567 struct Qdisc *root = qdisc_root_sleeping(qdisc);
568
569 ASSERT_RTNL();
570 return qdisc_lock(root);
571 }
572
573 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
574 {
575 return qdisc->dev_queue->dev;
576 }
577
578 static inline void sch_tree_lock(struct Qdisc *q)
579 {
580 if (q->flags & TCQ_F_MQROOT)
581 spin_lock_bh(qdisc_lock(q));
582 else
583 spin_lock_bh(qdisc_root_sleeping_lock(q));
584 }
585
586 static inline void sch_tree_unlock(struct Qdisc *q)
587 {
588 if (q->flags & TCQ_F_MQROOT)
589 spin_unlock_bh(qdisc_lock(q));
590 else
591 spin_unlock_bh(qdisc_root_sleeping_lock(q));
592 }
593
594 extern struct Qdisc noop_qdisc;
595 extern struct Qdisc_ops noop_qdisc_ops;
596 extern struct Qdisc_ops pfifo_fast_ops;
597 extern const u8 sch_default_prio2band[TC_PRIO_MAX + 1];
598 extern struct Qdisc_ops mq_qdisc_ops;
599 extern struct Qdisc_ops noqueue_qdisc_ops;
600 extern const struct Qdisc_ops *default_qdisc_ops;
601 static inline const struct Qdisc_ops *
602 get_default_qdisc_ops(const struct net_device *dev, int ntx)
603 {
604 return ntx < dev->real_num_tx_queues ?
605 default_qdisc_ops : &pfifo_fast_ops;
606 }
607
608 struct Qdisc_class_common {
609 u32 classid;
610 unsigned int filter_cnt;
611 struct hlist_node hnode;
612 };
613
614 struct Qdisc_class_hash {
615 struct hlist_head *hash;
616 unsigned int hashsize;
617 unsigned int hashmask;
618 unsigned int hashelems;
619 };
620
621 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
622 {
623 id ^= id >> 8;
624 id ^= id >> 4;
625 return id & mask;
626 }
627
628 static inline struct Qdisc_class_common *
629 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
630 {
631 struct Qdisc_class_common *cl;
632 unsigned int h;
633
634 if (!id)
635 return NULL;
636
637 h = qdisc_class_hash(id, hash->hashmask);
638 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
639 if (cl->classid == id)
640 return cl;
641 }
642 return NULL;
643 }
644
645 static inline bool qdisc_class_in_use(const struct Qdisc_class_common *cl)
646 {
647 return cl->filter_cnt > 0;
648 }
649
650 static inline void qdisc_class_get(struct Qdisc_class_common *cl)
651 {
652 unsigned int res;
653
654 if (check_add_overflow(cl->filter_cnt, 1, &res))
655 WARN(1, "Qdisc class overflow");
656
657 cl->filter_cnt = res;
658 }
659
660 static inline void qdisc_class_put(struct Qdisc_class_common *cl)
661 {
662 unsigned int res;
663
664 if (check_sub_overflow(cl->filter_cnt, 1, &res))
665 WARN(1, "Qdisc class underflow");
666
667 cl->filter_cnt = res;
668 }
669
670 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
671 {
672 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
673
674 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
675 }
676
677 int qdisc_class_hash_init(struct Qdisc_class_hash *);
678 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
679 struct Qdisc_class_common *);
680 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
681 struct Qdisc_class_common *);
682 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
683 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
684
685 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
686 void dev_qdisc_change_real_num_tx(struct net_device *dev,
687 unsigned int new_real_tx);
688 void dev_init_scheduler(struct net_device *dev);
689 void dev_shutdown(struct net_device *dev);
690 void dev_activate(struct net_device *dev);
691 void dev_deactivate(struct net_device *dev);
692 void dev_deactivate_many(struct list_head *head);
693 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
694 struct Qdisc *qdisc);
695 void qdisc_reset(struct Qdisc *qdisc);
696 void qdisc_destroy(struct Qdisc *qdisc);
697 void qdisc_put(struct Qdisc *qdisc);
698 void qdisc_put_unlocked(struct Qdisc *qdisc);
699 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
700 #ifdef CONFIG_NET_SCHED
701 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
702 void *type_data);
703 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
704 struct Qdisc *new, struct Qdisc *old,
705 enum tc_setup_type type, void *type_data,
706 struct netlink_ext_ack *extack);
707 #else
708 static inline int
709 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
710 void *type_data)
711 {
712 q->flags &= ~TCQ_F_OFFLOADED;
713 return 0;
714 }
715
716 static inline void
717 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
718 struct Qdisc *new, struct Qdisc *old,
719 enum tc_setup_type type, void *type_data,
720 struct netlink_ext_ack *extack)
721 {
722 }
723 #endif
724 void qdisc_offload_query_caps(struct net_device *dev,
725 enum tc_setup_type type,
726 void *caps, size_t caps_len);
727 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
728 const struct Qdisc_ops *ops,
729 struct netlink_ext_ack *extack);
730 void qdisc_free(struct Qdisc *qdisc);
731 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
732 const struct Qdisc_ops *ops, u32 parentid,
733 struct netlink_ext_ack *extack);
734 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
735 const struct qdisc_size_table *stab);
736 int skb_do_redirect(struct sk_buff *);
737
738 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
739 {
740 #ifdef CONFIG_NET_XGRESS
741 return skb->tc_at_ingress;
742 #else
743 return false;
744 #endif
745 }
746
747 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
748 {
749 #ifdef CONFIG_NET_CLS_ACT
750 if (skb->tc_skip_classify) {
751 skb->tc_skip_classify = 0;
752 return true;
753 }
754 #endif
755 return false;
756 }
757
758 /* Reset all TX qdiscs greater than index of a device. */
759 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
760 {
761 struct Qdisc *qdisc;
762
763 for (; i < dev->num_tx_queues; i++) {
764 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
765 if (qdisc) {
766 spin_lock_bh(qdisc_lock(qdisc));
767 qdisc_reset(qdisc);
768 spin_unlock_bh(qdisc_lock(qdisc));
769 }
770 }
771 }
772
773 /* Are all TX queues of the device empty? */
774 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
775 {
776 unsigned int i;
777
778 rcu_read_lock();
779 for (i = 0; i < dev->num_tx_queues; i++) {
780 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
781 const struct Qdisc *q = rcu_dereference(txq->qdisc);
782
783 if (!qdisc_is_empty(q)) {
784 rcu_read_unlock();
785 return false;
786 }
787 }
788 rcu_read_unlock();
789 return true;
790 }
791
792 /* Are any of the TX qdiscs changing? */
793 static inline bool qdisc_tx_changing(const struct net_device *dev)
794 {
795 unsigned int i;
796
797 for (i = 0; i < dev->num_tx_queues; i++) {
798 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
799
800 if (rcu_access_pointer(txq->qdisc) !=
801 rcu_access_pointer(txq->qdisc_sleeping))
802 return true;
803 }
804 return false;
805 }
806
807 /* Is the device using the noop qdisc on all queues? */
808 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
809 {
810 unsigned int i;
811
812 for (i = 0; i < dev->num_tx_queues; i++) {
813 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
814 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
815 return false;
816 }
817 return true;
818 }
819
820 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
821 {
822 return qdisc_skb_cb(skb)->pkt_len;
823 }
824
825 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
826 enum net_xmit_qdisc_t {
827 __NET_XMIT_STOLEN = 0x00010000,
828 __NET_XMIT_BYPASS = 0x00020000,
829 };
830
831 #ifdef CONFIG_NET_CLS_ACT
832 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
833 #else
834 #define net_xmit_drop_count(e) (1)
835 #endif
836
837 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
838 const struct Qdisc *sch)
839 {
840 #ifdef CONFIG_NET_SCHED
841 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
842
843 if (stab)
844 __qdisc_calculate_pkt_len(skb, stab);
845 #endif
846 }
847
848 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
849 struct sk_buff **to_free)
850 {
851 return sch->enqueue(skb, sch, to_free);
852 }
853
854 static inline void _bstats_update(struct gnet_stats_basic_sync *bstats,
855 __u64 bytes, __u32 packets)
856 {
857 u64_stats_update_begin(&bstats->syncp);
858 u64_stats_add(&bstats->bytes, bytes);
859 u64_stats_add(&bstats->packets, packets);
860 u64_stats_update_end(&bstats->syncp);
861 }
862
863 static inline void bstats_update(struct gnet_stats_basic_sync *bstats,
864 const struct sk_buff *skb)
865 {
866 _bstats_update(bstats,
867 qdisc_pkt_len(skb),
868 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
869 }
870
871 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
872 const struct sk_buff *skb)
873 {
874 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb);
875 }
876
877 static inline void qdisc_bstats_update(struct Qdisc *sch,
878 const struct sk_buff *skb)
879 {
880 bstats_update(&sch->bstats, skb);
881 }
882
883 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
884 const struct sk_buff *skb)
885 {
886 sch->qstats.backlog -= qdisc_pkt_len(skb);
887 }
888
889 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
890 const struct sk_buff *skb)
891 {
892 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
893 }
894
895 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
896 const struct sk_buff *skb)
897 {
898 sch->qstats.backlog += qdisc_pkt_len(skb);
899 }
900
901 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
902 const struct sk_buff *skb)
903 {
904 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
905 }
906
907 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
908 {
909 this_cpu_inc(sch->cpu_qstats->qlen);
910 }
911
912 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
913 {
914 this_cpu_dec(sch->cpu_qstats->qlen);
915 }
916
917 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
918 {
919 this_cpu_inc(sch->cpu_qstats->requeues);
920 }
921
922 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
923 {
924 sch->qstats.drops += count;
925 }
926
927 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
928 {
929 qstats->drops++;
930 }
931
932 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
933 {
934 qstats->overlimits++;
935 }
936
937 static inline void qdisc_qstats_drop(struct Qdisc *sch)
938 {
939 qstats_drop_inc(&sch->qstats);
940 }
941
942 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
943 {
944 this_cpu_inc(sch->cpu_qstats->drops);
945 }
946
947 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
948 {
949 sch->qstats.overlimits++;
950 }
951
952 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
953 {
954 __u32 qlen = qdisc_qlen_sum(sch);
955
956 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
957 }
958
959 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
960 __u32 *backlog)
961 {
962 struct gnet_stats_queue qstats = { 0 };
963
964 gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats);
965 *qlen = qstats.qlen + qdisc_qlen(sch);
966 *backlog = qstats.backlog;
967 }
968
969 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
970 {
971 __u32 qlen, backlog;
972
973 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
974 qdisc_tree_reduce_backlog(sch, qlen, backlog);
975 }
976
977 static inline void qdisc_purge_queue(struct Qdisc *sch)
978 {
979 __u32 qlen, backlog;
980
981 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
982 qdisc_reset(sch);
983 qdisc_tree_reduce_backlog(sch, qlen, backlog);
984 }
985
986 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
987 struct qdisc_skb_head *qh)
988 {
989 struct sk_buff *last = qh->tail;
990
991 if (last) {
992 skb->next = NULL;
993 last->next = skb;
994 qh->tail = skb;
995 } else {
996 qh->tail = skb;
997 qh->head = skb;
998 }
999 qh->qlen++;
1000 }
1001
1002 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
1003 {
1004 __qdisc_enqueue_tail(skb, &sch->q);
1005 qdisc_qstats_backlog_inc(sch, skb);
1006 return NET_XMIT_SUCCESS;
1007 }
1008
1009 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
1010 struct qdisc_skb_head *qh)
1011 {
1012 skb->next = qh->head;
1013
1014 if (!qh->head)
1015 qh->tail = skb;
1016 qh->head = skb;
1017 qh->qlen++;
1018 }
1019
1020 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
1021 {
1022 struct sk_buff *skb = qh->head;
1023
1024 if (likely(skb != NULL)) {
1025 qh->head = skb->next;
1026 qh->qlen--;
1027 if (qh->head == NULL)
1028 qh->tail = NULL;
1029 skb->next = NULL;
1030 }
1031
1032 return skb;
1033 }
1034
1035 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1036 {
1037 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1038
1039 if (likely(skb != NULL)) {
1040 qdisc_qstats_backlog_dec(sch, skb);
1041 qdisc_bstats_update(sch, skb);
1042 }
1043
1044 return skb;
1045 }
1046
1047 struct tc_skb_cb {
1048 struct qdisc_skb_cb qdisc_cb;
1049 u32 drop_reason;
1050
1051 u16 zone; /* Only valid if post_ct = true */
1052 u16 mru;
1053 u8 post_ct:1;
1054 u8 post_ct_snat:1;
1055 u8 post_ct_dnat:1;
1056 };
1057
1058 static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb)
1059 {
1060 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb;
1061
1062 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb));
1063 return cb;
1064 }
1065
1066 static inline enum skb_drop_reason
1067 tcf_get_drop_reason(const struct sk_buff *skb)
1068 {
1069 return tc_skb_cb(skb)->drop_reason;
1070 }
1071
1072 static inline void tcf_set_drop_reason(const struct sk_buff *skb,
1073 enum skb_drop_reason reason)
1074 {
1075 tc_skb_cb(skb)->drop_reason = reason;
1076 }
1077
1078 /* Instead of calling kfree_skb() while root qdisc lock is held,
1079 * queue the skb for future freeing at end of __dev_xmit_skb()
1080 */
1081 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1082 {
1083 skb->next = *to_free;
1084 *to_free = skb;
1085 }
1086
1087 static inline void __qdisc_drop_all(struct sk_buff *skb,
1088 struct sk_buff **to_free)
1089 {
1090 if (skb->prev)
1091 skb->prev->next = *to_free;
1092 else
1093 skb->next = *to_free;
1094 *to_free = skb;
1095 }
1096
1097 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1098 struct qdisc_skb_head *qh,
1099 struct sk_buff **to_free)
1100 {
1101 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1102
1103 if (likely(skb != NULL)) {
1104 unsigned int len = qdisc_pkt_len(skb);
1105
1106 qdisc_qstats_backlog_dec(sch, skb);
1107 __qdisc_drop(skb, to_free);
1108 return len;
1109 }
1110
1111 return 0;
1112 }
1113
1114 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1115 {
1116 const struct qdisc_skb_head *qh = &sch->q;
1117
1118 return qh->head;
1119 }
1120
1121 /* generic pseudo peek method for non-work-conserving qdisc */
1122 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1123 {
1124 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1125
1126 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1127 if (!skb) {
1128 skb = sch->dequeue(sch);
1129
1130 if (skb) {
1131 __skb_queue_head(&sch->gso_skb, skb);
1132 /* it's still part of the queue */
1133 qdisc_qstats_backlog_inc(sch, skb);
1134 sch->q.qlen++;
1135 }
1136 }
1137
1138 return skb;
1139 }
1140
1141 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1142 struct sk_buff *skb)
1143 {
1144 if (qdisc_is_percpu_stats(sch)) {
1145 qdisc_qstats_cpu_backlog_dec(sch, skb);
1146 qdisc_bstats_cpu_update(sch, skb);
1147 qdisc_qstats_cpu_qlen_dec(sch);
1148 } else {
1149 qdisc_qstats_backlog_dec(sch, skb);
1150 qdisc_bstats_update(sch, skb);
1151 sch->q.qlen--;
1152 }
1153 }
1154
1155 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1156 unsigned int pkt_len)
1157 {
1158 if (qdisc_is_percpu_stats(sch)) {
1159 qdisc_qstats_cpu_qlen_inc(sch);
1160 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1161 } else {
1162 sch->qstats.backlog += pkt_len;
1163 sch->q.qlen++;
1164 }
1165 }
1166
1167 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1168 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1169 {
1170 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1171
1172 if (skb) {
1173 skb = __skb_dequeue(&sch->gso_skb);
1174 if (qdisc_is_percpu_stats(sch)) {
1175 qdisc_qstats_cpu_backlog_dec(sch, skb);
1176 qdisc_qstats_cpu_qlen_dec(sch);
1177 } else {
1178 qdisc_qstats_backlog_dec(sch, skb);
1179 sch->q.qlen--;
1180 }
1181 } else {
1182 skb = sch->dequeue(sch);
1183 }
1184
1185 return skb;
1186 }
1187
1188 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1189 {
1190 /*
1191 * We do not know the backlog in bytes of this list, it
1192 * is up to the caller to correct it
1193 */
1194 ASSERT_RTNL();
1195 if (qh->qlen) {
1196 rtnl_kfree_skbs(qh->head, qh->tail);
1197
1198 qh->head = NULL;
1199 qh->tail = NULL;
1200 qh->qlen = 0;
1201 }
1202 }
1203
1204 static inline void qdisc_reset_queue(struct Qdisc *sch)
1205 {
1206 __qdisc_reset_queue(&sch->q);
1207 }
1208
1209 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1210 struct Qdisc **pold)
1211 {
1212 struct Qdisc *old;
1213
1214 sch_tree_lock(sch);
1215 old = *pold;
1216 *pold = new;
1217 if (old != NULL)
1218 qdisc_purge_queue(old);
1219 sch_tree_unlock(sch);
1220
1221 return old;
1222 }
1223
1224 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1225 {
1226 rtnl_kfree_skbs(skb, skb);
1227 qdisc_qstats_drop(sch);
1228 }
1229
1230 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1231 struct sk_buff **to_free)
1232 {
1233 __qdisc_drop(skb, to_free);
1234 qdisc_qstats_cpu_drop(sch);
1235
1236 return NET_XMIT_DROP;
1237 }
1238
1239 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1240 struct sk_buff **to_free)
1241 {
1242 __qdisc_drop(skb, to_free);
1243 qdisc_qstats_drop(sch);
1244
1245 return NET_XMIT_DROP;
1246 }
1247
1248 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1249 struct sk_buff **to_free)
1250 {
1251 __qdisc_drop_all(skb, to_free);
1252 qdisc_qstats_drop(sch);
1253
1254 return NET_XMIT_DROP;
1255 }
1256
1257 struct psched_ratecfg {
1258 u64 rate_bytes_ps; /* bytes per second */
1259 u32 mult;
1260 u16 overhead;
1261 u16 mpu;
1262 u8 linklayer;
1263 u8 shift;
1264 };
1265
1266 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1267 unsigned int len)
1268 {
1269 len += r->overhead;
1270
1271 if (len < r->mpu)
1272 len = r->mpu;
1273
1274 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1275 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1276
1277 return ((u64)len * r->mult) >> r->shift;
1278 }
1279
1280 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1281 const struct tc_ratespec *conf,
1282 u64 rate64);
1283
1284 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1285 const struct psched_ratecfg *r)
1286 {
1287 memset(res, 0, sizeof(*res));
1288
1289 /* legacy struct tc_ratespec has a 32bit @rate field
1290 * Qdisc using 64bit rate should add new attributes
1291 * in order to maintain compatibility.
1292 */
1293 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1294
1295 res->overhead = r->overhead;
1296 res->mpu = r->mpu;
1297 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1298 }
1299
1300 struct psched_pktrate {
1301 u64 rate_pkts_ps; /* packets per second */
1302 u32 mult;
1303 u8 shift;
1304 };
1305
1306 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r,
1307 unsigned int pkt_num)
1308 {
1309 return ((u64)pkt_num * r->mult) >> r->shift;
1310 }
1311
1312 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64);
1313
1314 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1315 * The fast path only needs to access filter list and to update stats
1316 */
1317 struct mini_Qdisc {
1318 struct tcf_proto *filter_list;
1319 struct tcf_block *block;
1320 struct gnet_stats_basic_sync __percpu *cpu_bstats;
1321 struct gnet_stats_queue __percpu *cpu_qstats;
1322 unsigned long rcu_state;
1323 };
1324
1325 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1326 const struct sk_buff *skb)
1327 {
1328 bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1329 }
1330
1331 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1332 {
1333 this_cpu_inc(miniq->cpu_qstats->drops);
1334 }
1335
1336 struct mini_Qdisc_pair {
1337 struct mini_Qdisc miniq1;
1338 struct mini_Qdisc miniq2;
1339 struct mini_Qdisc __rcu **p_miniq;
1340 };
1341
1342 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1343 struct tcf_proto *tp_head);
1344 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1345 struct mini_Qdisc __rcu **p_miniq);
1346 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1347 struct tcf_block *block);
1348
1349 void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx);
1350
1351 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));
1352
1353 /* Make sure qdisc is no longer in SCHED state. */
1354 static inline void qdisc_synchronize(const struct Qdisc *q)
1355 {
1356 while (test_bit(__QDISC_STATE_SCHED, &q->state))
1357 msleep(1);
1358 }
1359
1360 #endif
1361
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