xref: /linux/include/net/sch_generic.h (revision b50ecc5aca4d18f1f0c4942f5c797bc85edef144)
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