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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __NET_SCHED_GENERIC_H
3#define __NET_SCHED_GENERIC_H
4
5#include <linux/netdevice.h>
6#include <linux/types.h>
7#include <linux/rcupdate.h>
8#include <linux/pkt_sched.h>
9#include <linux/pkt_cls.h>
10#include <linux/percpu.h>
11#include <linux/dynamic_queue_limits.h>
12#include <linux/list.h>
13#include <linux/refcount.h>
14#include <linux/workqueue.h>
15#include <linux/mutex.h>
16#include <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(&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(&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(&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(&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(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(&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
217static 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
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(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(qdisc_lock(q));
581 else
582 spin_lock_bh(qdisc_root_sleeping_lock(q));
583}
584
585static inline void sch_tree_unlock(struct Qdisc *q)
586{
587 if (q->flags & TCQ_F_MQROOT)
588 spin_unlock_bh(qdisc_lock(q));
589 else
590 spin_unlock_bh(qdisc_root_sleeping_lock(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, 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(qdisc_lock(qdisc));
766 qdisc_reset(qdisc);
767 spin_unlock_bh(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, i);
780 const struct Qdisc *q = rcu_dereference(txq->qdisc);
781
782 if (!qdisc_is_empty(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, 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/* Is the device using the noop qdisc on all queues? */
807static inline bool qdisc_tx_is_noop(const struct net_device *dev)
808{
809 unsigned int i;
810
811 for (i = 0; i < dev->num_tx_queues; i++) {
812 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
813 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
814 return false;
815 }
816 return true;
817}
818
819static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
820{
821 return qdisc_skb_cb(skb)->pkt_len;
822}
823
824/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
825enum net_xmit_qdisc_t {
826 __NET_XMIT_STOLEN = 0x00010000,
827 __NET_XMIT_BYPASS = 0x00020000,
828};
829
830#ifdef CONFIG_NET_CLS_ACT
831#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
832#else
833#define net_xmit_drop_count(e) (1)
834#endif
835
836static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
837 const struct Qdisc *sch)
838{
839#ifdef CONFIG_NET_SCHED
840 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
841
842 if (stab)
843 __qdisc_calculate_pkt_len(skb, stab);
844#endif
845}
846
847static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
848 struct sk_buff **to_free)
849{
850 return sch->enqueue(skb, sch, to_free);
851}
852
853static inline void _bstats_update(struct gnet_stats_basic_sync *bstats,
854 __u64 bytes, __u64 packets)
855{
856 u64_stats_update_begin(&bstats->syncp);
857 u64_stats_add(&bstats->bytes, bytes);
858 u64_stats_add(&bstats->packets, packets);
859 u64_stats_update_end(&bstats->syncp);
860}
861
862static inline void bstats_update(struct gnet_stats_basic_sync *bstats,
863 const struct sk_buff *skb)
864{
865 _bstats_update(bstats,
866 qdisc_pkt_len(skb),
867 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
868}
869
870static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
871 const struct sk_buff *skb)
872{
873 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb);
874}
875
876static inline void qdisc_bstats_update(struct Qdisc *sch,
877 const struct sk_buff *skb)
878{
879 bstats_update(&sch->bstats, skb);
880}
881
882static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
883 const struct sk_buff *skb)
884{
885 sch->qstats.backlog -= qdisc_pkt_len(skb);
886}
887
888static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
889 const struct sk_buff *skb)
890{
891 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
892}
893
894static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
895 const struct sk_buff *skb)
896{
897 sch->qstats.backlog += qdisc_pkt_len(skb);
898}
899
900static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
901 const struct sk_buff *skb)
902{
903 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
904}
905
906static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
907{
908 this_cpu_inc(sch->cpu_qstats->qlen);
909}
910
911static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
912{
913 this_cpu_dec(sch->cpu_qstats->qlen);
914}
915
916static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
917{
918 this_cpu_inc(sch->cpu_qstats->requeues);
919}
920
921static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
922{
923 sch->qstats.drops += count;
924}
925
926static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
927{
928 qstats->drops++;
929}
930
931static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
932{
933 qstats->overlimits++;
934}
935
936static inline void qdisc_qstats_drop(struct Qdisc *sch)
937{
938 qstats_drop_inc(&sch->qstats);
939}
940
941static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
942{
943 this_cpu_inc(sch->cpu_qstats->drops);
944}
945
946static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
947{
948 sch->qstats.overlimits++;
949}
950
951static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
952{
953 __u32 qlen = qdisc_qlen_sum(sch);
954
955 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
956}
957
958static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
959 __u32 *backlog)
960{
961 struct gnet_stats_queue qstats = { 0 };
962
963 gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats);
964 *qlen = qstats.qlen + qdisc_qlen(sch);
965 *backlog = qstats.backlog;
966}
967
968static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
969{
970 __u32 qlen, backlog;
971
972 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
973 qdisc_tree_reduce_backlog(sch, qlen, backlog);
974}
975
976static inline void qdisc_purge_queue(struct Qdisc *sch)
977{
978 __u32 qlen, backlog;
979
980 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
981 qdisc_reset(sch);
982 qdisc_tree_reduce_backlog(sch, qlen, backlog);
983}
984
985static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
986 struct qdisc_skb_head *qh)
987{
988 struct sk_buff *last = qh->tail;
989
990 if (last) {
991 skb->next = NULL;
992 last->next = skb;
993 qh->tail = skb;
994 } else {
995 qh->tail = skb;
996 qh->head = skb;
997 }
998 qh->qlen++;
999}
1000
1001static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
1002{
1003 __qdisc_enqueue_tail(skb, &sch->q);
1004 qdisc_qstats_backlog_inc(sch, skb);
1005 return NET_XMIT_SUCCESS;
1006}
1007
1008static inline void __qdisc_enqueue_head(struct sk_buff *skb,
1009 struct qdisc_skb_head *qh)
1010{
1011 skb->next = qh->head;
1012
1013 if (!qh->head)
1014 qh->tail = skb;
1015 qh->head = skb;
1016 qh->qlen++;
1017}
1018
1019static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
1020{
1021 struct sk_buff *skb = qh->head;
1022
1023 if (likely(skb != NULL)) {
1024 qh->head = skb->next;
1025 qh->qlen--;
1026 if (qh->head == NULL)
1027 qh->tail = NULL;
1028 skb->next = NULL;
1029 }
1030
1031 return skb;
1032}
1033
1034static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1035{
1036 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1037
1038 if (likely(skb != NULL)) {
1039 qdisc_qstats_backlog_dec(sch, skb);
1040 qdisc_bstats_update(sch, skb);
1041 }
1042
1043 return skb;
1044}
1045
1046struct tc_skb_cb {
1047 struct qdisc_skb_cb qdisc_cb;
1048 u32 drop_reason;
1049
1050 u16 zone; /* Only valid if post_ct = true */
1051 u16 mru;
1052 u8 post_ct:1;
1053 u8 post_ct_snat:1;
1054 u8 post_ct_dnat:1;
1055};
1056
1057static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb)
1058{
1059 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb;
1060
1061 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb));
1062 return cb;
1063}
1064
1065static inline enum skb_drop_reason
1066tcf_get_drop_reason(const struct sk_buff *skb)
1067{
1068 return tc_skb_cb(skb)->drop_reason;
1069}
1070
1071static inline void tcf_set_drop_reason(const struct sk_buff *skb,
1072 enum skb_drop_reason reason)
1073{
1074 tc_skb_cb(skb)->drop_reason = reason;
1075}
1076
1077/* Instead of calling kfree_skb() while root qdisc lock is held,
1078 * queue the skb for future freeing at end of __dev_xmit_skb()
1079 */
1080static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1081{
1082 skb->next = *to_free;
1083 *to_free = skb;
1084}
1085
1086static inline void __qdisc_drop_all(struct sk_buff *skb,
1087 struct sk_buff **to_free)
1088{
1089 if (skb->prev)
1090 skb->prev->next = *to_free;
1091 else
1092 skb->next = *to_free;
1093 *to_free = skb;
1094}
1095
1096static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1097 struct qdisc_skb_head *qh,
1098 struct sk_buff **to_free)
1099{
1100 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1101
1102 if (likely(skb != NULL)) {
1103 unsigned int len = qdisc_pkt_len(skb);
1104
1105 qdisc_qstats_backlog_dec(sch, skb);
1106 __qdisc_drop(skb, to_free);
1107 return len;
1108 }
1109
1110 return 0;
1111}
1112
1113static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1114{
1115 const struct qdisc_skb_head *qh = &sch->q;
1116
1117 return qh->head;
1118}
1119
1120/* generic pseudo peek method for non-work-conserving qdisc */
1121static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1122{
1123 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1124
1125 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1126 if (!skb) {
1127 skb = sch->dequeue(sch);
1128
1129 if (skb) {
1130 __skb_queue_head(&sch->gso_skb, skb);
1131 /* it's still part of the queue */
1132 qdisc_qstats_backlog_inc(sch, skb);
1133 sch->q.qlen++;
1134 }
1135 }
1136
1137 return skb;
1138}
1139
1140static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1141 struct sk_buff *skb)
1142{
1143 if (qdisc_is_percpu_stats(sch)) {
1144 qdisc_qstats_cpu_backlog_dec(sch, skb);
1145 qdisc_bstats_cpu_update(sch, skb);
1146 qdisc_qstats_cpu_qlen_dec(sch);
1147 } else {
1148 qdisc_qstats_backlog_dec(sch, skb);
1149 qdisc_bstats_update(sch, skb);
1150 sch->q.qlen--;
1151 }
1152}
1153
1154static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1155 unsigned int pkt_len)
1156{
1157 if (qdisc_is_percpu_stats(sch)) {
1158 qdisc_qstats_cpu_qlen_inc(sch);
1159 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1160 } else {
1161 sch->qstats.backlog += pkt_len;
1162 sch->q.qlen++;
1163 }
1164}
1165
1166/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1167static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1168{
1169 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1170
1171 if (skb) {
1172 skb = __skb_dequeue(&sch->gso_skb);
1173 if (qdisc_is_percpu_stats(sch)) {
1174 qdisc_qstats_cpu_backlog_dec(sch, skb);
1175 qdisc_qstats_cpu_qlen_dec(sch);
1176 } else {
1177 qdisc_qstats_backlog_dec(sch, skb);
1178 sch->q.qlen--;
1179 }
1180 } else {
1181 skb = sch->dequeue(sch);
1182 }
1183
1184 return skb;
1185}
1186
1187static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1188{
1189 /*
1190 * We do not know the backlog in bytes of this list, it
1191 * is up to the caller to correct it
1192 */
1193 ASSERT_RTNL();
1194 if (qh->qlen) {
1195 rtnl_kfree_skbs(qh->head, qh->tail);
1196
1197 qh->head = NULL;
1198 qh->tail = NULL;
1199 qh->qlen = 0;
1200 }
1201}
1202
1203static inline void qdisc_reset_queue(struct Qdisc *sch)
1204{
1205 __qdisc_reset_queue(&sch->q);
1206}
1207
1208static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1209 struct Qdisc **pold)
1210{
1211 struct Qdisc *old;
1212
1213 sch_tree_lock(sch);
1214 old = *pold;
1215 *pold = new;
1216 if (old != NULL)
1217 qdisc_purge_queue(old);
1218 sch_tree_unlock(sch);
1219
1220 return old;
1221}
1222
1223static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1224{
1225 rtnl_kfree_skbs(skb, skb);
1226 qdisc_qstats_drop(sch);
1227}
1228
1229static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1230 struct sk_buff **to_free)
1231{
1232 __qdisc_drop(skb, to_free);
1233 qdisc_qstats_cpu_drop(sch);
1234
1235 return NET_XMIT_DROP;
1236}
1237
1238static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1239 struct sk_buff **to_free)
1240{
1241 __qdisc_drop(skb, to_free);
1242 qdisc_qstats_drop(sch);
1243
1244 return NET_XMIT_DROP;
1245}
1246
1247static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1248 struct sk_buff **to_free)
1249{
1250 __qdisc_drop_all(skb, to_free);
1251 qdisc_qstats_drop(sch);
1252
1253 return NET_XMIT_DROP;
1254}
1255
1256struct psched_ratecfg {
1257 u64 rate_bytes_ps; /* bytes per second */
1258 u32 mult;
1259 u16 overhead;
1260 u16 mpu;
1261 u8 linklayer;
1262 u8 shift;
1263};
1264
1265static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1266 unsigned int len)
1267{
1268 len += r->overhead;
1269
1270 if (len < r->mpu)
1271 len = r->mpu;
1272
1273 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1274 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1275
1276 return ((u64)len * r->mult) >> r->shift;
1277}
1278
1279void psched_ratecfg_precompute(struct psched_ratecfg *r,
1280 const struct tc_ratespec *conf,
1281 u64 rate64);
1282
1283static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1284 const struct psched_ratecfg *r)
1285{
1286 memset(res, 0, sizeof(*res));
1287
1288 /* legacy struct tc_ratespec has a 32bit @rate field
1289 * Qdisc using 64bit rate should add new attributes
1290 * in order to maintain compatibility.
1291 */
1292 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1293
1294 res->overhead = r->overhead;
1295 res->mpu = r->mpu;
1296 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1297}
1298
1299struct psched_pktrate {
1300 u64 rate_pkts_ps; /* packets per second */
1301 u32 mult;
1302 u8 shift;
1303};
1304
1305static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r,
1306 unsigned int pkt_num)
1307{
1308 return ((u64)pkt_num * r->mult) >> r->shift;
1309}
1310
1311void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64);
1312
1313/* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1314 * The fast path only needs to access filter list and to update stats
1315 */
1316struct mini_Qdisc {
1317 struct tcf_proto *filter_list;
1318 struct tcf_block *block;
1319 struct gnet_stats_basic_sync __percpu *cpu_bstats;
1320 struct gnet_stats_queue __percpu *cpu_qstats;
1321 unsigned long rcu_state;
1322};
1323
1324static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1325 const struct sk_buff *skb)
1326{
1327 bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1328}
1329
1330static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1331{
1332 this_cpu_inc(miniq->cpu_qstats->drops);
1333}
1334
1335struct mini_Qdisc_pair {
1336 struct mini_Qdisc miniq1;
1337 struct mini_Qdisc miniq2;
1338 struct mini_Qdisc __rcu **p_miniq;
1339};
1340
1341void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1342 struct tcf_proto *tp_head);
1343void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1344 struct mini_Qdisc __rcu **p_miniq);
1345void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1346 struct tcf_block *block);
1347
1348void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx);
1349
1350int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));
1351
1352/* Make sure qdisc is no longer in SCHED state. */
1353static inline void qdisc_synchronize(const struct Qdisc *q)
1354{
1355 while (test_bit(__QDISC_STATE_SCHED, &q->state))
1356 msleep(1);
1357}
1358
1359#endif
1#ifndef __NET_SCHED_GENERIC_H
2#define __NET_SCHED_GENERIC_H
3
4#include <linux/netdevice.h>
5#include <linux/types.h>
6#include <linux/rcupdate.h>
7#include <linux/pkt_sched.h>
8#include <linux/pkt_cls.h>
9#include <linux/percpu.h>
10#include <linux/dynamic_queue_limits.h>
11#include <net/gen_stats.h>
12#include <net/rtnetlink.h>
13
14struct Qdisc_ops;
15struct qdisc_walker;
16struct tcf_walker;
17struct module;
18
19struct qdisc_rate_table {
20 struct tc_ratespec rate;
21 u32 data[256];
22 struct qdisc_rate_table *next;
23 int refcnt;
24};
25
26enum qdisc_state_t {
27 __QDISC_STATE_SCHED,
28 __QDISC_STATE_DEACTIVATED,
29};
30
31struct qdisc_size_table {
32 struct rcu_head rcu;
33 struct list_head list;
34 struct tc_sizespec szopts;
35 int refcnt;
36 u16 data[];
37};
38
39/* similar to sk_buff_head, but skb->prev pointer is undefined. */
40struct qdisc_skb_head {
41 struct sk_buff *head;
42 struct sk_buff *tail;
43 __u32 qlen;
44 spinlock_t lock;
45};
46
47struct Qdisc {
48 int (*enqueue)(struct sk_buff *skb,
49 struct Qdisc *sch,
50 struct sk_buff **to_free);
51 struct sk_buff * (*dequeue)(struct Qdisc *sch);
52 unsigned int flags;
53#define TCQ_F_BUILTIN 1
54#define TCQ_F_INGRESS 2
55#define TCQ_F_CAN_BYPASS 4
56#define TCQ_F_MQROOT 8
57#define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
58 * q->dev_queue : It can test
59 * netif_xmit_frozen_or_stopped() before
60 * dequeueing next packet.
61 * Its true for MQ/MQPRIO slaves, or non
62 * multiqueue device.
63 */
64#define TCQ_F_WARN_NONWC (1 << 16)
65#define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
66#define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
67 * qdisc_tree_decrease_qlen() should stop.
68 */
69 u32 limit;
70 const struct Qdisc_ops *ops;
71 struct qdisc_size_table __rcu *stab;
72 struct hlist_node hash;
73 u32 handle;
74 u32 parent;
75 void *u32_node;
76
77 struct netdev_queue *dev_queue;
78
79 struct net_rate_estimator __rcu *rate_est;
80 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
81 struct gnet_stats_queue __percpu *cpu_qstats;
82
83 /*
84 * For performance sake on SMP, we put highly modified fields at the end
85 */
86 struct sk_buff *gso_skb ____cacheline_aligned_in_smp;
87 struct qdisc_skb_head q;
88 struct gnet_stats_basic_packed bstats;
89 seqcount_t running;
90 struct gnet_stats_queue qstats;
91 unsigned long state;
92 struct Qdisc *next_sched;
93 struct sk_buff *skb_bad_txq;
94 struct rcu_head rcu_head;
95 int padded;
96 atomic_t refcnt;
97
98 spinlock_t busylock ____cacheline_aligned_in_smp;
99};
100
101static inline bool qdisc_is_running(const struct Qdisc *qdisc)
102{
103 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
104}
105
106static inline bool qdisc_run_begin(struct Qdisc *qdisc)
107{
108 if (qdisc_is_running(qdisc))
109 return false;
110 /* Variant of write_seqcount_begin() telling lockdep a trylock
111 * was attempted.
112 */
113 raw_write_seqcount_begin(&qdisc->running);
114 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
115 return true;
116}
117
118static inline void qdisc_run_end(struct Qdisc *qdisc)
119{
120 write_seqcount_end(&qdisc->running);
121}
122
123static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
124{
125 return qdisc->flags & TCQ_F_ONETXQUEUE;
126}
127
128static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
129{
130#ifdef CONFIG_BQL
131 /* Non-BQL migrated drivers will return 0, too. */
132 return dql_avail(&txq->dql);
133#else
134 return 0;
135#endif
136}
137
138struct Qdisc_class_ops {
139 /* Child qdisc manipulation */
140 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
141 int (*graft)(struct Qdisc *, unsigned long cl,
142 struct Qdisc *, struct Qdisc **);
143 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
144 void (*qlen_notify)(struct Qdisc *, unsigned long);
145
146 /* Class manipulation routines */
147 unsigned long (*get)(struct Qdisc *, u32 classid);
148 void (*put)(struct Qdisc *, unsigned long);
149 int (*change)(struct Qdisc *, u32, u32,
150 struct nlattr **, unsigned long *);
151 int (*delete)(struct Qdisc *, unsigned long);
152 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
153
154 /* Filter manipulation */
155 struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long);
156 bool (*tcf_cl_offload)(u32 classid);
157 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
158 u32 classid);
159 void (*unbind_tcf)(struct Qdisc *, unsigned long);
160
161 /* rtnetlink specific */
162 int (*dump)(struct Qdisc *, unsigned long,
163 struct sk_buff *skb, struct tcmsg*);
164 int (*dump_stats)(struct Qdisc *, unsigned long,
165 struct gnet_dump *);
166};
167
168struct Qdisc_ops {
169 struct Qdisc_ops *next;
170 const struct Qdisc_class_ops *cl_ops;
171 char id[IFNAMSIZ];
172 int priv_size;
173
174 int (*enqueue)(struct sk_buff *skb,
175 struct Qdisc *sch,
176 struct sk_buff **to_free);
177 struct sk_buff * (*dequeue)(struct Qdisc *);
178 struct sk_buff * (*peek)(struct Qdisc *);
179
180 int (*init)(struct Qdisc *, struct nlattr *arg);
181 void (*reset)(struct Qdisc *);
182 void (*destroy)(struct Qdisc *);
183 int (*change)(struct Qdisc *, struct nlattr *arg);
184 void (*attach)(struct Qdisc *);
185
186 int (*dump)(struct Qdisc *, struct sk_buff *);
187 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
188
189 struct module *owner;
190};
191
192
193struct tcf_result {
194 unsigned long class;
195 u32 classid;
196};
197
198struct tcf_proto_ops {
199 struct list_head head;
200 char kind[IFNAMSIZ];
201
202 int (*classify)(struct sk_buff *,
203 const struct tcf_proto *,
204 struct tcf_result *);
205 int (*init)(struct tcf_proto*);
206 bool (*destroy)(struct tcf_proto*, bool);
207
208 unsigned long (*get)(struct tcf_proto*, u32 handle);
209 int (*change)(struct net *net, struct sk_buff *,
210 struct tcf_proto*, unsigned long,
211 u32 handle, struct nlattr **,
212 unsigned long *, bool);
213 int (*delete)(struct tcf_proto*, unsigned long);
214 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
215
216 /* rtnetlink specific */
217 int (*dump)(struct net*, struct tcf_proto*, unsigned long,
218 struct sk_buff *skb, struct tcmsg*);
219
220 struct module *owner;
221};
222
223struct tcf_proto {
224 /* Fast access part */
225 struct tcf_proto __rcu *next;
226 void __rcu *root;
227 int (*classify)(struct sk_buff *,
228 const struct tcf_proto *,
229 struct tcf_result *);
230 __be16 protocol;
231
232 /* All the rest */
233 u32 prio;
234 u32 classid;
235 struct Qdisc *q;
236 void *data;
237 const struct tcf_proto_ops *ops;
238 struct rcu_head rcu;
239};
240
241struct qdisc_skb_cb {
242 unsigned int pkt_len;
243 u16 slave_dev_queue_mapping;
244 u16 tc_classid;
245#define QDISC_CB_PRIV_LEN 20
246 unsigned char data[QDISC_CB_PRIV_LEN];
247};
248
249static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
250{
251 struct qdisc_skb_cb *qcb;
252
253 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
254 BUILD_BUG_ON(sizeof(qcb->data) < sz);
255}
256
257static inline int qdisc_qlen(const struct Qdisc *q)
258{
259 return q->q.qlen;
260}
261
262static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
263{
264 return (struct qdisc_skb_cb *)skb->cb;
265}
266
267static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
268{
269 return &qdisc->q.lock;
270}
271
272static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
273{
274 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
275
276 return q;
277}
278
279static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
280{
281 return qdisc->dev_queue->qdisc_sleeping;
282}
283
284/* The qdisc root lock is a mechanism by which to top level
285 * of a qdisc tree can be locked from any qdisc node in the
286 * forest. This allows changing the configuration of some
287 * aspect of the qdisc tree while blocking out asynchronous
288 * qdisc access in the packet processing paths.
289 *
290 * It is only legal to do this when the root will not change
291 * on us. Otherwise we'll potentially lock the wrong qdisc
292 * root. This is enforced by holding the RTNL semaphore, which
293 * all users of this lock accessor must do.
294 */
295static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
296{
297 struct Qdisc *root = qdisc_root(qdisc);
298
299 ASSERT_RTNL();
300 return qdisc_lock(root);
301}
302
303static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
304{
305 struct Qdisc *root = qdisc_root_sleeping(qdisc);
306
307 ASSERT_RTNL();
308 return qdisc_lock(root);
309}
310
311static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
312{
313 struct Qdisc *root = qdisc_root_sleeping(qdisc);
314
315 ASSERT_RTNL();
316 return &root->running;
317}
318
319static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
320{
321 return qdisc->dev_queue->dev;
322}
323
324static inline void sch_tree_lock(const struct Qdisc *q)
325{
326 spin_lock_bh(qdisc_root_sleeping_lock(q));
327}
328
329static inline void sch_tree_unlock(const struct Qdisc *q)
330{
331 spin_unlock_bh(qdisc_root_sleeping_lock(q));
332}
333
334#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
335#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
336
337extern struct Qdisc noop_qdisc;
338extern struct Qdisc_ops noop_qdisc_ops;
339extern struct Qdisc_ops pfifo_fast_ops;
340extern struct Qdisc_ops mq_qdisc_ops;
341extern struct Qdisc_ops noqueue_qdisc_ops;
342extern const struct Qdisc_ops *default_qdisc_ops;
343static inline const struct Qdisc_ops *
344get_default_qdisc_ops(const struct net_device *dev, int ntx)
345{
346 return ntx < dev->real_num_tx_queues ?
347 default_qdisc_ops : &pfifo_fast_ops;
348}
349
350struct Qdisc_class_common {
351 u32 classid;
352 struct hlist_node hnode;
353};
354
355struct Qdisc_class_hash {
356 struct hlist_head *hash;
357 unsigned int hashsize;
358 unsigned int hashmask;
359 unsigned int hashelems;
360};
361
362static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
363{
364 id ^= id >> 8;
365 id ^= id >> 4;
366 return id & mask;
367}
368
369static inline struct Qdisc_class_common *
370qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
371{
372 struct Qdisc_class_common *cl;
373 unsigned int h;
374
375 h = qdisc_class_hash(id, hash->hashmask);
376 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
377 if (cl->classid == id)
378 return cl;
379 }
380 return NULL;
381}
382
383int qdisc_class_hash_init(struct Qdisc_class_hash *);
384void qdisc_class_hash_insert(struct Qdisc_class_hash *,
385 struct Qdisc_class_common *);
386void qdisc_class_hash_remove(struct Qdisc_class_hash *,
387 struct Qdisc_class_common *);
388void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
389void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
390
391void dev_init_scheduler(struct net_device *dev);
392void dev_shutdown(struct net_device *dev);
393void dev_activate(struct net_device *dev);
394void dev_deactivate(struct net_device *dev);
395void dev_deactivate_many(struct list_head *head);
396struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
397 struct Qdisc *qdisc);
398void qdisc_reset(struct Qdisc *qdisc);
399void qdisc_destroy(struct Qdisc *qdisc);
400void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
401 unsigned int len);
402struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
403 const struct Qdisc_ops *ops);
404struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
405 const struct Qdisc_ops *ops, u32 parentid);
406void __qdisc_calculate_pkt_len(struct sk_buff *skb,
407 const struct qdisc_size_table *stab);
408bool tcf_destroy(struct tcf_proto *tp, bool force);
409void tcf_destroy_chain(struct tcf_proto __rcu **fl);
410int skb_do_redirect(struct sk_buff *);
411
412static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
413{
414#ifdef CONFIG_NET_CLS_ACT
415 return G_TC_AT(skb->tc_verd) & AT_INGRESS;
416#else
417 return false;
418#endif
419}
420
421/* Reset all TX qdiscs greater then index of a device. */
422static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
423{
424 struct Qdisc *qdisc;
425
426 for (; i < dev->num_tx_queues; i++) {
427 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
428 if (qdisc) {
429 spin_lock_bh(qdisc_lock(qdisc));
430 qdisc_reset(qdisc);
431 spin_unlock_bh(qdisc_lock(qdisc));
432 }
433 }
434}
435
436static inline void qdisc_reset_all_tx(struct net_device *dev)
437{
438 qdisc_reset_all_tx_gt(dev, 0);
439}
440
441/* Are all TX queues of the device empty? */
442static inline bool qdisc_all_tx_empty(const struct net_device *dev)
443{
444 unsigned int i;
445
446 rcu_read_lock();
447 for (i = 0; i < dev->num_tx_queues; i++) {
448 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
449 const struct Qdisc *q = rcu_dereference(txq->qdisc);
450
451 if (q->q.qlen) {
452 rcu_read_unlock();
453 return false;
454 }
455 }
456 rcu_read_unlock();
457 return true;
458}
459
460/* Are any of the TX qdiscs changing? */
461static inline bool qdisc_tx_changing(const struct net_device *dev)
462{
463 unsigned int i;
464
465 for (i = 0; i < dev->num_tx_queues; i++) {
466 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
467 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
468 return true;
469 }
470 return false;
471}
472
473/* Is the device using the noop qdisc on all queues? */
474static inline bool qdisc_tx_is_noop(const struct net_device *dev)
475{
476 unsigned int i;
477
478 for (i = 0; i < dev->num_tx_queues; i++) {
479 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
480 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
481 return false;
482 }
483 return true;
484}
485
486static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
487{
488 return qdisc_skb_cb(skb)->pkt_len;
489}
490
491/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
492enum net_xmit_qdisc_t {
493 __NET_XMIT_STOLEN = 0x00010000,
494 __NET_XMIT_BYPASS = 0x00020000,
495};
496
497#ifdef CONFIG_NET_CLS_ACT
498#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
499#else
500#define net_xmit_drop_count(e) (1)
501#endif
502
503static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
504 const struct Qdisc *sch)
505{
506#ifdef CONFIG_NET_SCHED
507 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
508
509 if (stab)
510 __qdisc_calculate_pkt_len(skb, stab);
511#endif
512}
513
514static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
515 struct sk_buff **to_free)
516{
517 qdisc_calculate_pkt_len(skb, sch);
518 return sch->enqueue(skb, sch, to_free);
519}
520
521static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
522{
523 return q->flags & TCQ_F_CPUSTATS;
524}
525
526static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
527 __u64 bytes, __u32 packets)
528{
529 bstats->bytes += bytes;
530 bstats->packets += packets;
531}
532
533static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
534 const struct sk_buff *skb)
535{
536 _bstats_update(bstats,
537 qdisc_pkt_len(skb),
538 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
539}
540
541static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
542 __u64 bytes, __u32 packets)
543{
544 u64_stats_update_begin(&bstats->syncp);
545 _bstats_update(&bstats->bstats, bytes, packets);
546 u64_stats_update_end(&bstats->syncp);
547}
548
549static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
550 const struct sk_buff *skb)
551{
552 u64_stats_update_begin(&bstats->syncp);
553 bstats_update(&bstats->bstats, skb);
554 u64_stats_update_end(&bstats->syncp);
555}
556
557static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
558 const struct sk_buff *skb)
559{
560 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
561}
562
563static inline void qdisc_bstats_update(struct Qdisc *sch,
564 const struct sk_buff *skb)
565{
566 bstats_update(&sch->bstats, skb);
567}
568
569static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
570 const struct sk_buff *skb)
571{
572 sch->qstats.backlog -= qdisc_pkt_len(skb);
573}
574
575static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
576 const struct sk_buff *skb)
577{
578 sch->qstats.backlog += qdisc_pkt_len(skb);
579}
580
581static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
582{
583 sch->qstats.drops += count;
584}
585
586static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
587{
588 qstats->drops++;
589}
590
591static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
592{
593 qstats->overlimits++;
594}
595
596static inline void qdisc_qstats_drop(struct Qdisc *sch)
597{
598 qstats_drop_inc(&sch->qstats);
599}
600
601static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
602{
603 this_cpu_inc(sch->cpu_qstats->drops);
604}
605
606static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
607{
608 sch->qstats.overlimits++;
609}
610
611static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
612{
613 qh->head = NULL;
614 qh->tail = NULL;
615 qh->qlen = 0;
616}
617
618static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
619 struct qdisc_skb_head *qh)
620{
621 struct sk_buff *last = qh->tail;
622
623 if (last) {
624 skb->next = NULL;
625 last->next = skb;
626 qh->tail = skb;
627 } else {
628 qh->tail = skb;
629 qh->head = skb;
630 }
631 qh->qlen++;
632 qdisc_qstats_backlog_inc(sch, skb);
633
634 return NET_XMIT_SUCCESS;
635}
636
637static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
638{
639 return __qdisc_enqueue_tail(skb, sch, &sch->q);
640}
641
642static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
643{
644 struct sk_buff *skb = qh->head;
645
646 if (likely(skb != NULL)) {
647 qh->head = skb->next;
648 qh->qlen--;
649 if (qh->head == NULL)
650 qh->tail = NULL;
651 skb->next = NULL;
652 }
653
654 return skb;
655}
656
657static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
658{
659 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
660
661 if (likely(skb != NULL)) {
662 qdisc_qstats_backlog_dec(sch, skb);
663 qdisc_bstats_update(sch, skb);
664 }
665
666 return skb;
667}
668
669/* Instead of calling kfree_skb() while root qdisc lock is held,
670 * queue the skb for future freeing at end of __dev_xmit_skb()
671 */
672static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
673{
674 skb->next = *to_free;
675 *to_free = skb;
676}
677
678static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
679 struct qdisc_skb_head *qh,
680 struct sk_buff **to_free)
681{
682 struct sk_buff *skb = __qdisc_dequeue_head(qh);
683
684 if (likely(skb != NULL)) {
685 unsigned int len = qdisc_pkt_len(skb);
686
687 qdisc_qstats_backlog_dec(sch, skb);
688 __qdisc_drop(skb, to_free);
689 return len;
690 }
691
692 return 0;
693}
694
695static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
696 struct sk_buff **to_free)
697{
698 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
699}
700
701static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
702{
703 const struct qdisc_skb_head *qh = &sch->q;
704
705 return qh->head;
706}
707
708/* generic pseudo peek method for non-work-conserving qdisc */
709static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
710{
711 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
712 if (!sch->gso_skb) {
713 sch->gso_skb = sch->dequeue(sch);
714 if (sch->gso_skb) {
715 /* it's still part of the queue */
716 qdisc_qstats_backlog_inc(sch, sch->gso_skb);
717 sch->q.qlen++;
718 }
719 }
720
721 return sch->gso_skb;
722}
723
724/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
725static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
726{
727 struct sk_buff *skb = sch->gso_skb;
728
729 if (skb) {
730 sch->gso_skb = NULL;
731 qdisc_qstats_backlog_dec(sch, skb);
732 sch->q.qlen--;
733 } else {
734 skb = sch->dequeue(sch);
735 }
736
737 return skb;
738}
739
740static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
741{
742 /*
743 * We do not know the backlog in bytes of this list, it
744 * is up to the caller to correct it
745 */
746 ASSERT_RTNL();
747 if (qh->qlen) {
748 rtnl_kfree_skbs(qh->head, qh->tail);
749
750 qh->head = NULL;
751 qh->tail = NULL;
752 qh->qlen = 0;
753 }
754}
755
756static inline void qdisc_reset_queue(struct Qdisc *sch)
757{
758 __qdisc_reset_queue(&sch->q);
759 sch->qstats.backlog = 0;
760}
761
762static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
763 struct Qdisc **pold)
764{
765 struct Qdisc *old;
766
767 sch_tree_lock(sch);
768 old = *pold;
769 *pold = new;
770 if (old != NULL) {
771 qdisc_tree_reduce_backlog(old, old->q.qlen, old->qstats.backlog);
772 qdisc_reset(old);
773 }
774 sch_tree_unlock(sch);
775
776 return old;
777}
778
779static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
780{
781 rtnl_kfree_skbs(skb, skb);
782 qdisc_qstats_drop(sch);
783}
784
785
786static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
787 struct sk_buff **to_free)
788{
789 __qdisc_drop(skb, to_free);
790 qdisc_qstats_drop(sch);
791
792 return NET_XMIT_DROP;
793}
794
795/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
796 long it will take to send a packet given its size.
797 */
798static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
799{
800 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
801 if (slot < 0)
802 slot = 0;
803 slot >>= rtab->rate.cell_log;
804 if (slot > 255)
805 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
806 return rtab->data[slot];
807}
808
809struct psched_ratecfg {
810 u64 rate_bytes_ps; /* bytes per second */
811 u32 mult;
812 u16 overhead;
813 u8 linklayer;
814 u8 shift;
815};
816
817static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
818 unsigned int len)
819{
820 len += r->overhead;
821
822 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
823 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
824
825 return ((u64)len * r->mult) >> r->shift;
826}
827
828void psched_ratecfg_precompute(struct psched_ratecfg *r,
829 const struct tc_ratespec *conf,
830 u64 rate64);
831
832static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
833 const struct psched_ratecfg *r)
834{
835 memset(res, 0, sizeof(*res));
836
837 /* legacy struct tc_ratespec has a 32bit @rate field
838 * Qdisc using 64bit rate should add new attributes
839 * in order to maintain compatibility.
840 */
841 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
842
843 res->overhead = r->overhead;
844 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
845}
846
847#endif