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