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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
23struct Qdisc_ops;
24struct qdisc_walker;
25struct tcf_walker;
26struct module;
27struct bpf_flow_keys;
28
29struct qdisc_rate_table {
30 struct tc_ratespec rate;
31 u32 data[256];
32 struct qdisc_rate_table *next;
33 int refcnt;
34};
35
36enum qdisc_state_t {
37 __QDISC_STATE_SCHED,
38 __QDISC_STATE_DEACTIVATED,
39 __QDISC_STATE_MISSED,
40 __QDISC_STATE_DRAINING,
41};
42
43#define QDISC_STATE_MISSED BIT(__QDISC_STATE_MISSED)
44#define QDISC_STATE_DRAINING BIT(__QDISC_STATE_DRAINING)
45
46#define QDISC_STATE_NON_EMPTY (QDISC_STATE_MISSED | \
47 QDISC_STATE_DRAINING)
48
49struct qdisc_size_table {
50 struct rcu_head rcu;
51 struct list_head list;
52 struct tc_sizespec szopts;
53 int refcnt;
54 u16 data[];
55};
56
57/* similar to sk_buff_head, but skb->prev pointer is undefined. */
58struct qdisc_skb_head {
59 struct sk_buff *head;
60 struct sk_buff *tail;
61 __u32 qlen;
62 spinlock_t lock;
63};
64
65struct Qdisc {
66 int (*enqueue)(struct sk_buff *skb,
67 struct Qdisc *sch,
68 struct sk_buff **to_free);
69 struct sk_buff * (*dequeue)(struct Qdisc *sch);
70 unsigned int flags;
71#define TCQ_F_BUILTIN 1
72#define TCQ_F_INGRESS 2
73#define TCQ_F_CAN_BYPASS 4
74#define TCQ_F_MQROOT 8
75#define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
76 * q->dev_queue : It can test
77 * netif_xmit_frozen_or_stopped() before
78 * dequeueing next packet.
79 * Its true for MQ/MQPRIO slaves, or non
80 * multiqueue device.
81 */
82#define TCQ_F_WARN_NONWC (1 << 16)
83#define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
84#define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
85 * qdisc_tree_decrease_qlen() should stop.
86 */
87#define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
88#define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
89#define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
90 u32 limit;
91 const struct Qdisc_ops *ops;
92 struct qdisc_size_table __rcu *stab;
93 struct hlist_node hash;
94 u32 handle;
95 u32 parent;
96
97 struct netdev_queue *dev_queue;
98
99 struct net_rate_estimator __rcu *rate_est;
100 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
101 struct gnet_stats_queue __percpu *cpu_qstats;
102 int pad;
103 refcount_t refcnt;
104
105 /*
106 * For performance sake on SMP, we put highly modified fields at the end
107 */
108 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
109 struct qdisc_skb_head q;
110 struct gnet_stats_basic_packed bstats;
111 seqcount_t running;
112 struct gnet_stats_queue qstats;
113 unsigned long state;
114 struct Qdisc *next_sched;
115 struct sk_buff_head skb_bad_txq;
116
117 spinlock_t busylock ____cacheline_aligned_in_smp;
118 spinlock_t seqlock;
119
120 struct rcu_head rcu;
121
122 /* private data */
123 long privdata[] ____cacheline_aligned;
124};
125
126static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
127{
128 if (qdisc->flags & TCQ_F_BUILTIN)
129 return;
130 refcount_inc(&qdisc->refcnt);
131}
132
133/* Intended to be used by unlocked users, when concurrent qdisc release is
134 * possible.
135 */
136
137static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
138{
139 if (qdisc->flags & TCQ_F_BUILTIN)
140 return qdisc;
141 if (refcount_inc_not_zero(&qdisc->refcnt))
142 return qdisc;
143 return NULL;
144}
145
146static inline bool qdisc_is_running(struct Qdisc *qdisc)
147{
148 if (qdisc->flags & TCQ_F_NOLOCK)
149 return spin_is_locked(&qdisc->seqlock);
150 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
151}
152
153static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc)
154{
155 return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY);
156}
157
158static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
159{
160 return q->flags & TCQ_F_CPUSTATS;
161}
162
163static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
164{
165 if (qdisc_is_percpu_stats(qdisc))
166 return nolock_qdisc_is_empty(qdisc);
167 return !READ_ONCE(qdisc->q.qlen);
168}
169
170static inline bool qdisc_run_begin(struct Qdisc *qdisc)
171{
172 if (qdisc->flags & TCQ_F_NOLOCK) {
173 if (spin_trylock(&qdisc->seqlock))
174 return true;
175
176 /* Paired with smp_mb__after_atomic() to make sure
177 * STATE_MISSED checking is synchronized with clearing
178 * in pfifo_fast_dequeue().
179 */
180 smp_mb__before_atomic();
181
182 /* If the MISSED flag is set, it means other thread has
183 * set the MISSED flag before second spin_trylock(), so
184 * we can return false here to avoid multi cpus doing
185 * the set_bit() and second spin_trylock() concurrently.
186 */
187 if (test_bit(__QDISC_STATE_MISSED, &qdisc->state))
188 return false;
189
190 /* Set the MISSED flag before the second spin_trylock(),
191 * if the second spin_trylock() return false, it means
192 * other cpu holding the lock will do dequeuing for us
193 * or it will see the MISSED flag set after releasing
194 * lock and reschedule the net_tx_action() to do the
195 * dequeuing.
196 */
197 set_bit(__QDISC_STATE_MISSED, &qdisc->state);
198
199 /* spin_trylock() only has load-acquire semantic, so use
200 * smp_mb__after_atomic() to ensure STATE_MISSED is set
201 * before doing the second spin_trylock().
202 */
203 smp_mb__after_atomic();
204
205 /* Retry again in case other CPU may not see the new flag
206 * after it releases the lock at the end of qdisc_run_end().
207 */
208 return spin_trylock(&qdisc->seqlock);
209 } else if (qdisc_is_running(qdisc)) {
210 return false;
211 }
212 /* Variant of write_seqcount_begin() telling lockdep a trylock
213 * was attempted.
214 */
215 raw_write_seqcount_begin(&qdisc->running);
216 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
217 return true;
218}
219
220static inline void qdisc_run_end(struct Qdisc *qdisc)
221{
222 if (qdisc->flags & TCQ_F_NOLOCK) {
223 spin_unlock(&qdisc->seqlock);
224
225 if (unlikely(test_bit(__QDISC_STATE_MISSED,
226 &qdisc->state)))
227 __netif_schedule(qdisc);
228 } else {
229 write_seqcount_end(&qdisc->running);
230 }
231}
232
233static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
234{
235 return qdisc->flags & TCQ_F_ONETXQUEUE;
236}
237
238static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
239{
240#ifdef CONFIG_BQL
241 /* Non-BQL migrated drivers will return 0, too. */
242 return dql_avail(&txq->dql);
243#else
244 return 0;
245#endif
246}
247
248struct Qdisc_class_ops {
249 unsigned int flags;
250 /* Child qdisc manipulation */
251 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
252 int (*graft)(struct Qdisc *, unsigned long cl,
253 struct Qdisc *, struct Qdisc **,
254 struct netlink_ext_ack *extack);
255 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
256 void (*qlen_notify)(struct Qdisc *, unsigned long);
257
258 /* Class manipulation routines */
259 unsigned long (*find)(struct Qdisc *, u32 classid);
260 int (*change)(struct Qdisc *, u32, u32,
261 struct nlattr **, unsigned long *,
262 struct netlink_ext_ack *);
263 int (*delete)(struct Qdisc *, unsigned long,
264 struct netlink_ext_ack *);
265 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
266
267 /* Filter manipulation */
268 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
269 unsigned long arg,
270 struct netlink_ext_ack *extack);
271 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
272 u32 classid);
273 void (*unbind_tcf)(struct Qdisc *, unsigned long);
274
275 /* rtnetlink specific */
276 int (*dump)(struct Qdisc *, unsigned long,
277 struct sk_buff *skb, struct tcmsg*);
278 int (*dump_stats)(struct Qdisc *, unsigned long,
279 struct gnet_dump *);
280};
281
282/* Qdisc_class_ops flag values */
283
284/* Implements API that doesn't require rtnl lock */
285enum qdisc_class_ops_flags {
286 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
287};
288
289struct Qdisc_ops {
290 struct Qdisc_ops *next;
291 const struct Qdisc_class_ops *cl_ops;
292 char id[IFNAMSIZ];
293 int priv_size;
294 unsigned int static_flags;
295
296 int (*enqueue)(struct sk_buff *skb,
297 struct Qdisc *sch,
298 struct sk_buff **to_free);
299 struct sk_buff * (*dequeue)(struct Qdisc *);
300 struct sk_buff * (*peek)(struct Qdisc *);
301
302 int (*init)(struct Qdisc *sch, struct nlattr *arg,
303 struct netlink_ext_ack *extack);
304 void (*reset)(struct Qdisc *);
305 void (*destroy)(struct Qdisc *);
306 int (*change)(struct Qdisc *sch,
307 struct nlattr *arg,
308 struct netlink_ext_ack *extack);
309 void (*attach)(struct Qdisc *sch);
310 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
311
312 int (*dump)(struct Qdisc *, struct sk_buff *);
313 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
314
315 void (*ingress_block_set)(struct Qdisc *sch,
316 u32 block_index);
317 void (*egress_block_set)(struct Qdisc *sch,
318 u32 block_index);
319 u32 (*ingress_block_get)(struct Qdisc *sch);
320 u32 (*egress_block_get)(struct Qdisc *sch);
321
322 struct module *owner;
323};
324
325
326struct tcf_result {
327 union {
328 struct {
329 unsigned long class;
330 u32 classid;
331 };
332 const struct tcf_proto *goto_tp;
333
334 /* used in the skb_tc_reinsert function */
335 struct {
336 bool ingress;
337 struct gnet_stats_queue *qstats;
338 };
339 };
340};
341
342struct tcf_chain;
343
344struct tcf_proto_ops {
345 struct list_head head;
346 char kind[IFNAMSIZ];
347
348 int (*classify)(struct sk_buff *,
349 const struct tcf_proto *,
350 struct tcf_result *);
351 int (*init)(struct tcf_proto*);
352 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
353 struct netlink_ext_ack *extack);
354
355 void* (*get)(struct tcf_proto*, u32 handle);
356 void (*put)(struct tcf_proto *tp, void *f);
357 int (*change)(struct net *net, struct sk_buff *,
358 struct tcf_proto*, unsigned long,
359 u32 handle, struct nlattr **,
360 void **, bool, bool,
361 struct netlink_ext_ack *);
362 int (*delete)(struct tcf_proto *tp, void *arg,
363 bool *last, bool rtnl_held,
364 struct netlink_ext_ack *);
365 bool (*delete_empty)(struct tcf_proto *tp);
366 void (*walk)(struct tcf_proto *tp,
367 struct tcf_walker *arg, bool rtnl_held);
368 int (*reoffload)(struct tcf_proto *tp, bool add,
369 flow_setup_cb_t *cb, void *cb_priv,
370 struct netlink_ext_ack *extack);
371 void (*hw_add)(struct tcf_proto *tp,
372 void *type_data);
373 void (*hw_del)(struct tcf_proto *tp,
374 void *type_data);
375 void (*bind_class)(void *, u32, unsigned long,
376 void *, unsigned long);
377 void * (*tmplt_create)(struct net *net,
378 struct tcf_chain *chain,
379 struct nlattr **tca,
380 struct netlink_ext_ack *extack);
381 void (*tmplt_destroy)(void *tmplt_priv);
382
383 /* rtnetlink specific */
384 int (*dump)(struct net*, struct tcf_proto*, void *,
385 struct sk_buff *skb, struct tcmsg*,
386 bool);
387 int (*terse_dump)(struct net *net,
388 struct tcf_proto *tp, void *fh,
389 struct sk_buff *skb,
390 struct tcmsg *t, bool rtnl_held);
391 int (*tmplt_dump)(struct sk_buff *skb,
392 struct net *net,
393 void *tmplt_priv);
394
395 struct module *owner;
396 int flags;
397};
398
399/* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
400 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
401 * conditions can occur when filters are inserted/deleted simultaneously.
402 */
403enum tcf_proto_ops_flags {
404 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
405};
406
407struct tcf_proto {
408 /* Fast access part */
409 struct tcf_proto __rcu *next;
410 void __rcu *root;
411
412 /* called under RCU BH lock*/
413 int (*classify)(struct sk_buff *,
414 const struct tcf_proto *,
415 struct tcf_result *);
416 __be16 protocol;
417
418 /* All the rest */
419 u32 prio;
420 void *data;
421 const struct tcf_proto_ops *ops;
422 struct tcf_chain *chain;
423 /* Lock protects tcf_proto shared state and can be used by unlocked
424 * classifiers to protect their private data.
425 */
426 spinlock_t lock;
427 bool deleting;
428 refcount_t refcnt;
429 struct rcu_head rcu;
430 struct hlist_node destroy_ht_node;
431};
432
433struct qdisc_skb_cb {
434 struct {
435 unsigned int pkt_len;
436 u16 slave_dev_queue_mapping;
437 u16 tc_classid;
438 };
439#define QDISC_CB_PRIV_LEN 20
440 unsigned char data[QDISC_CB_PRIV_LEN];
441 u16 mru;
442 bool post_ct;
443};
444
445typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
446
447struct tcf_chain {
448 /* Protects filter_chain. */
449 struct mutex filter_chain_lock;
450 struct tcf_proto __rcu *filter_chain;
451 struct list_head list;
452 struct tcf_block *block;
453 u32 index; /* chain index */
454 unsigned int refcnt;
455 unsigned int action_refcnt;
456 bool explicitly_created;
457 bool flushing;
458 const struct tcf_proto_ops *tmplt_ops;
459 void *tmplt_priv;
460 struct rcu_head rcu;
461};
462
463struct tcf_block {
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 offloadcnt; /* Number of oddloaded filters */
479 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
480 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
481 struct {
482 struct tcf_chain *chain;
483 struct list_head filter_chain_list;
484 } chain0;
485 struct rcu_head rcu;
486 DECLARE_HASHTABLE(proto_destroy_ht, 7);
487 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
488};
489
490static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
491{
492 return lockdep_is_held(&chain->filter_chain_lock);
493}
494
495static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
496{
497 return lockdep_is_held(&tp->lock);
498}
499
500#define tcf_chain_dereference(p, chain) \
501 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
502
503#define tcf_proto_dereference(p, tp) \
504 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
505
506static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
507{
508 struct qdisc_skb_cb *qcb;
509
510 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb));
511 BUILD_BUG_ON(sizeof(qcb->data) < sz);
512}
513
514static inline int qdisc_qlen_cpu(const struct Qdisc *q)
515{
516 return this_cpu_ptr(q->cpu_qstats)->qlen;
517}
518
519static inline int qdisc_qlen(const struct Qdisc *q)
520{
521 return q->q.qlen;
522}
523
524static inline int qdisc_qlen_sum(const struct Qdisc *q)
525{
526 __u32 qlen = q->qstats.qlen;
527 int i;
528
529 if (qdisc_is_percpu_stats(q)) {
530 for_each_possible_cpu(i)
531 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
532 } else {
533 qlen += q->q.qlen;
534 }
535
536 return qlen;
537}
538
539static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
540{
541 return (struct qdisc_skb_cb *)skb->cb;
542}
543
544static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
545{
546 return &qdisc->q.lock;
547}
548
549static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
550{
551 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
552
553 return q;
554}
555
556static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
557{
558 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
559}
560
561static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
562{
563 return qdisc->dev_queue->qdisc_sleeping;
564}
565
566/* The qdisc root lock is a mechanism by which to top level
567 * of a qdisc tree can be locked from any qdisc node in the
568 * forest. This allows changing the configuration of some
569 * aspect of the qdisc tree while blocking out asynchronous
570 * qdisc access in the packet processing paths.
571 *
572 * It is only legal to do this when the root will not change
573 * on us. Otherwise we'll potentially lock the wrong qdisc
574 * root. This is enforced by holding the RTNL semaphore, which
575 * all users of this lock accessor must do.
576 */
577static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
578{
579 struct Qdisc *root = qdisc_root(qdisc);
580
581 ASSERT_RTNL();
582 return qdisc_lock(root);
583}
584
585static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
586{
587 struct Qdisc *root = qdisc_root_sleeping(qdisc);
588
589 ASSERT_RTNL();
590 return qdisc_lock(root);
591}
592
593static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
594{
595 struct Qdisc *root = qdisc_root_sleeping(qdisc);
596
597 ASSERT_RTNL();
598 return &root->running;
599}
600
601static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
602{
603 return qdisc->dev_queue->dev;
604}
605
606static inline void sch_tree_lock(struct Qdisc *q)
607{
608 if (q->flags & TCQ_F_MQROOT)
609 spin_lock_bh(qdisc_lock(q));
610 else
611 spin_lock_bh(qdisc_root_sleeping_lock(q));
612}
613
614static inline void sch_tree_unlock(struct Qdisc *q)
615{
616 if (q->flags & TCQ_F_MQROOT)
617 spin_unlock_bh(qdisc_lock(q));
618 else
619 spin_unlock_bh(qdisc_root_sleeping_lock(q));
620}
621
622extern struct Qdisc noop_qdisc;
623extern struct Qdisc_ops noop_qdisc_ops;
624extern struct Qdisc_ops pfifo_fast_ops;
625extern struct Qdisc_ops mq_qdisc_ops;
626extern struct Qdisc_ops noqueue_qdisc_ops;
627extern const struct Qdisc_ops *default_qdisc_ops;
628static inline const struct Qdisc_ops *
629get_default_qdisc_ops(const struct net_device *dev, int ntx)
630{
631 return ntx < dev->real_num_tx_queues ?
632 default_qdisc_ops : &pfifo_fast_ops;
633}
634
635struct Qdisc_class_common {
636 u32 classid;
637 struct hlist_node hnode;
638};
639
640struct Qdisc_class_hash {
641 struct hlist_head *hash;
642 unsigned int hashsize;
643 unsigned int hashmask;
644 unsigned int hashelems;
645};
646
647static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
648{
649 id ^= id >> 8;
650 id ^= id >> 4;
651 return id & mask;
652}
653
654static inline struct Qdisc_class_common *
655qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
656{
657 struct Qdisc_class_common *cl;
658 unsigned int h;
659
660 if (!id)
661 return NULL;
662
663 h = qdisc_class_hash(id, hash->hashmask);
664 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
665 if (cl->classid == id)
666 return cl;
667 }
668 return NULL;
669}
670
671static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
672{
673 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
674
675 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
676}
677
678int qdisc_class_hash_init(struct Qdisc_class_hash *);
679void qdisc_class_hash_insert(struct Qdisc_class_hash *,
680 struct Qdisc_class_common *);
681void qdisc_class_hash_remove(struct Qdisc_class_hash *,
682 struct Qdisc_class_common *);
683void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
684void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
685
686int dev_qdisc_change_tx_queue_len(struct net_device *dev);
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_put(struct Qdisc *qdisc);
696void qdisc_put_unlocked(struct Qdisc *qdisc);
697void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
698#ifdef CONFIG_NET_SCHED
699int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
700 void *type_data);
701void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
702 struct Qdisc *new, struct Qdisc *old,
703 enum tc_setup_type type, void *type_data,
704 struct netlink_ext_ack *extack);
705#else
706static inline int
707qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
708 void *type_data)
709{
710 q->flags &= ~TCQ_F_OFFLOADED;
711 return 0;
712}
713
714static inline void
715qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
716 struct Qdisc *new, struct Qdisc *old,
717 enum tc_setup_type type, void *type_data,
718 struct netlink_ext_ack *extack)
719{
720}
721#endif
722struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
723 const struct Qdisc_ops *ops,
724 struct netlink_ext_ack *extack);
725void qdisc_free(struct Qdisc *qdisc);
726struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
727 const struct Qdisc_ops *ops, u32 parentid,
728 struct netlink_ext_ack *extack);
729void __qdisc_calculate_pkt_len(struct sk_buff *skb,
730 const struct qdisc_size_table *stab);
731int skb_do_redirect(struct sk_buff *);
732
733static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
734{
735#ifdef CONFIG_NET_CLS_ACT
736 return skb->tc_at_ingress;
737#else
738 return false;
739#endif
740}
741
742static inline bool skb_skip_tc_classify(struct sk_buff *skb)
743{
744#ifdef CONFIG_NET_CLS_ACT
745 if (skb->tc_skip_classify) {
746 skb->tc_skip_classify = 0;
747 return true;
748 }
749#endif
750 return false;
751}
752
753/* Reset all TX qdiscs greater than index of a device. */
754static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
755{
756 struct Qdisc *qdisc;
757
758 for (; i < dev->num_tx_queues; i++) {
759 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
760 if (qdisc) {
761 spin_lock_bh(qdisc_lock(qdisc));
762 qdisc_reset(qdisc);
763 spin_unlock_bh(qdisc_lock(qdisc));
764 }
765 }
766}
767
768/* Are all TX queues of the device empty? */
769static inline bool qdisc_all_tx_empty(const struct net_device *dev)
770{
771 unsigned int i;
772
773 rcu_read_lock();
774 for (i = 0; i < dev->num_tx_queues; i++) {
775 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
776 const struct Qdisc *q = rcu_dereference(txq->qdisc);
777
778 if (!qdisc_is_empty(q)) {
779 rcu_read_unlock();
780 return false;
781 }
782 }
783 rcu_read_unlock();
784 return true;
785}
786
787/* Are any of the TX qdiscs changing? */
788static inline bool qdisc_tx_changing(const struct net_device *dev)
789{
790 unsigned int i;
791
792 for (i = 0; i < dev->num_tx_queues; i++) {
793 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
794 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
795 return true;
796 }
797 return false;
798}
799
800/* Is the device using the noop qdisc on all queues? */
801static inline bool qdisc_tx_is_noop(const struct net_device *dev)
802{
803 unsigned int i;
804
805 for (i = 0; i < dev->num_tx_queues; i++) {
806 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
807 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
808 return false;
809 }
810 return true;
811}
812
813static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
814{
815 return qdisc_skb_cb(skb)->pkt_len;
816}
817
818/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
819enum net_xmit_qdisc_t {
820 __NET_XMIT_STOLEN = 0x00010000,
821 __NET_XMIT_BYPASS = 0x00020000,
822};
823
824#ifdef CONFIG_NET_CLS_ACT
825#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
826#else
827#define net_xmit_drop_count(e) (1)
828#endif
829
830static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
831 const struct Qdisc *sch)
832{
833#ifdef CONFIG_NET_SCHED
834 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
835
836 if (stab)
837 __qdisc_calculate_pkt_len(skb, stab);
838#endif
839}
840
841static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
842 struct sk_buff **to_free)
843{
844 qdisc_calculate_pkt_len(skb, sch);
845 return sch->enqueue(skb, sch, to_free);
846}
847
848static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
849 __u64 bytes, __u32 packets)
850{
851 bstats->bytes += bytes;
852 bstats->packets += packets;
853}
854
855static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
856 const struct sk_buff *skb)
857{
858 _bstats_update(bstats,
859 qdisc_pkt_len(skb),
860 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
861}
862
863static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
864 __u64 bytes, __u32 packets)
865{
866 u64_stats_update_begin(&bstats->syncp);
867 _bstats_update(&bstats->bstats, bytes, packets);
868 u64_stats_update_end(&bstats->syncp);
869}
870
871static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
872 const struct sk_buff *skb)
873{
874 u64_stats_update_begin(&bstats->syncp);
875 bstats_update(&bstats->bstats, skb);
876 u64_stats_update_end(&bstats->syncp);
877}
878
879static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
880 const struct sk_buff *skb)
881{
882 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
883}
884
885static inline void qdisc_bstats_update(struct Qdisc *sch,
886 const struct sk_buff *skb)
887{
888 bstats_update(&sch->bstats, skb);
889}
890
891static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
892 const struct sk_buff *skb)
893{
894 sch->qstats.backlog -= qdisc_pkt_len(skb);
895}
896
897static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
898 const struct sk_buff *skb)
899{
900 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
901}
902
903static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
904 const struct sk_buff *skb)
905{
906 sch->qstats.backlog += qdisc_pkt_len(skb);
907}
908
909static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
910 const struct sk_buff *skb)
911{
912 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
913}
914
915static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
916{
917 this_cpu_inc(sch->cpu_qstats->qlen);
918}
919
920static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
921{
922 this_cpu_dec(sch->cpu_qstats->qlen);
923}
924
925static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
926{
927 this_cpu_inc(sch->cpu_qstats->requeues);
928}
929
930static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
931{
932 sch->qstats.drops += count;
933}
934
935static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
936{
937 qstats->drops++;
938}
939
940static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
941{
942 qstats->overlimits++;
943}
944
945static inline void qdisc_qstats_drop(struct Qdisc *sch)
946{
947 qstats_drop_inc(&sch->qstats);
948}
949
950static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
951{
952 this_cpu_inc(sch->cpu_qstats->drops);
953}
954
955static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
956{
957 sch->qstats.overlimits++;
958}
959
960static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
961{
962 __u32 qlen = qdisc_qlen_sum(sch);
963
964 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
965}
966
967static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
968 __u32 *backlog)
969{
970 struct gnet_stats_queue qstats = { 0 };
971 __u32 len = qdisc_qlen_sum(sch);
972
973 __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
974 *qlen = qstats.qlen;
975 *backlog = qstats.backlog;
976}
977
978static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
979{
980 __u32 qlen, backlog;
981
982 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
983 qdisc_tree_reduce_backlog(sch, qlen, backlog);
984}
985
986static inline void qdisc_purge_queue(struct Qdisc *sch)
987{
988 __u32 qlen, backlog;
989
990 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
991 qdisc_reset(sch);
992 qdisc_tree_reduce_backlog(sch, qlen, backlog);
993}
994
995static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
996{
997 qh->head = NULL;
998 qh->tail = NULL;
999 qh->qlen = 0;
1000}
1001
1002static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
1003 struct qdisc_skb_head *qh)
1004{
1005 struct sk_buff *last = qh->tail;
1006
1007 if (last) {
1008 skb->next = NULL;
1009 last->next = skb;
1010 qh->tail = skb;
1011 } else {
1012 qh->tail = skb;
1013 qh->head = skb;
1014 }
1015 qh->qlen++;
1016}
1017
1018static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
1019{
1020 __qdisc_enqueue_tail(skb, &sch->q);
1021 qdisc_qstats_backlog_inc(sch, skb);
1022 return NET_XMIT_SUCCESS;
1023}
1024
1025static inline void __qdisc_enqueue_head(struct sk_buff *skb,
1026 struct qdisc_skb_head *qh)
1027{
1028 skb->next = qh->head;
1029
1030 if (!qh->head)
1031 qh->tail = skb;
1032 qh->head = skb;
1033 qh->qlen++;
1034}
1035
1036static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
1037{
1038 struct sk_buff *skb = qh->head;
1039
1040 if (likely(skb != NULL)) {
1041 qh->head = skb->next;
1042 qh->qlen--;
1043 if (qh->head == NULL)
1044 qh->tail = NULL;
1045 skb->next = NULL;
1046 }
1047
1048 return skb;
1049}
1050
1051static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1052{
1053 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1054
1055 if (likely(skb != NULL)) {
1056 qdisc_qstats_backlog_dec(sch, skb);
1057 qdisc_bstats_update(sch, skb);
1058 }
1059
1060 return skb;
1061}
1062
1063/* Instead of calling kfree_skb() while root qdisc lock is held,
1064 * queue the skb for future freeing at end of __dev_xmit_skb()
1065 */
1066static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1067{
1068 skb->next = *to_free;
1069 *to_free = skb;
1070}
1071
1072static inline void __qdisc_drop_all(struct sk_buff *skb,
1073 struct sk_buff **to_free)
1074{
1075 if (skb->prev)
1076 skb->prev->next = *to_free;
1077 else
1078 skb->next = *to_free;
1079 *to_free = skb;
1080}
1081
1082static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1083 struct qdisc_skb_head *qh,
1084 struct sk_buff **to_free)
1085{
1086 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1087
1088 if (likely(skb != NULL)) {
1089 unsigned int len = qdisc_pkt_len(skb);
1090
1091 qdisc_qstats_backlog_dec(sch, skb);
1092 __qdisc_drop(skb, to_free);
1093 return len;
1094 }
1095
1096 return 0;
1097}
1098
1099static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1100{
1101 const struct qdisc_skb_head *qh = &sch->q;
1102
1103 return qh->head;
1104}
1105
1106/* generic pseudo peek method for non-work-conserving qdisc */
1107static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1108{
1109 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1110
1111 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1112 if (!skb) {
1113 skb = sch->dequeue(sch);
1114
1115 if (skb) {
1116 __skb_queue_head(&sch->gso_skb, skb);
1117 /* it's still part of the queue */
1118 qdisc_qstats_backlog_inc(sch, skb);
1119 sch->q.qlen++;
1120 }
1121 }
1122
1123 return skb;
1124}
1125
1126static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1127 struct sk_buff *skb)
1128{
1129 if (qdisc_is_percpu_stats(sch)) {
1130 qdisc_qstats_cpu_backlog_dec(sch, skb);
1131 qdisc_bstats_cpu_update(sch, skb);
1132 qdisc_qstats_cpu_qlen_dec(sch);
1133 } else {
1134 qdisc_qstats_backlog_dec(sch, skb);
1135 qdisc_bstats_update(sch, skb);
1136 sch->q.qlen--;
1137 }
1138}
1139
1140static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1141 unsigned int pkt_len)
1142{
1143 if (qdisc_is_percpu_stats(sch)) {
1144 qdisc_qstats_cpu_qlen_inc(sch);
1145 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1146 } else {
1147 sch->qstats.backlog += pkt_len;
1148 sch->q.qlen++;
1149 }
1150}
1151
1152/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1153static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1154{
1155 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1156
1157 if (skb) {
1158 skb = __skb_dequeue(&sch->gso_skb);
1159 if (qdisc_is_percpu_stats(sch)) {
1160 qdisc_qstats_cpu_backlog_dec(sch, skb);
1161 qdisc_qstats_cpu_qlen_dec(sch);
1162 } else {
1163 qdisc_qstats_backlog_dec(sch, skb);
1164 sch->q.qlen--;
1165 }
1166 } else {
1167 skb = sch->dequeue(sch);
1168 }
1169
1170 return skb;
1171}
1172
1173static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1174{
1175 /*
1176 * We do not know the backlog in bytes of this list, it
1177 * is up to the caller to correct it
1178 */
1179 ASSERT_RTNL();
1180 if (qh->qlen) {
1181 rtnl_kfree_skbs(qh->head, qh->tail);
1182
1183 qh->head = NULL;
1184 qh->tail = NULL;
1185 qh->qlen = 0;
1186 }
1187}
1188
1189static inline void qdisc_reset_queue(struct Qdisc *sch)
1190{
1191 __qdisc_reset_queue(&sch->q);
1192 sch->qstats.backlog = 0;
1193}
1194
1195static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1196 struct Qdisc **pold)
1197{
1198 struct Qdisc *old;
1199
1200 sch_tree_lock(sch);
1201 old = *pold;
1202 *pold = new;
1203 if (old != NULL)
1204 qdisc_purge_queue(old);
1205 sch_tree_unlock(sch);
1206
1207 return old;
1208}
1209
1210static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1211{
1212 rtnl_kfree_skbs(skb, skb);
1213 qdisc_qstats_drop(sch);
1214}
1215
1216static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1217 struct sk_buff **to_free)
1218{
1219 __qdisc_drop(skb, to_free);
1220 qdisc_qstats_cpu_drop(sch);
1221
1222 return NET_XMIT_DROP;
1223}
1224
1225static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1226 struct sk_buff **to_free)
1227{
1228 __qdisc_drop(skb, to_free);
1229 qdisc_qstats_drop(sch);
1230
1231 return NET_XMIT_DROP;
1232}
1233
1234static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1235 struct sk_buff **to_free)
1236{
1237 __qdisc_drop_all(skb, to_free);
1238 qdisc_qstats_drop(sch);
1239
1240 return NET_XMIT_DROP;
1241}
1242
1243/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1244 long it will take to send a packet given its size.
1245 */
1246static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1247{
1248 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1249 if (slot < 0)
1250 slot = 0;
1251 slot >>= rtab->rate.cell_log;
1252 if (slot > 255)
1253 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1254 return rtab->data[slot];
1255}
1256
1257struct psched_ratecfg {
1258 u64 rate_bytes_ps; /* bytes per second */
1259 u32 mult;
1260 u16 overhead;
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 (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1271 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1272
1273 return ((u64)len * r->mult) >> r->shift;
1274}
1275
1276void psched_ratecfg_precompute(struct psched_ratecfg *r,
1277 const struct tc_ratespec *conf,
1278 u64 rate64);
1279
1280static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1281 const struct psched_ratecfg *r)
1282{
1283 memset(res, 0, sizeof(*res));
1284
1285 /* legacy struct tc_ratespec has a 32bit @rate field
1286 * Qdisc using 64bit rate should add new attributes
1287 * in order to maintain compatibility.
1288 */
1289 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1290
1291 res->overhead = r->overhead;
1292 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1293}
1294
1295struct psched_pktrate {
1296 u64 rate_pkts_ps; /* packets per second */
1297 u32 mult;
1298 u8 shift;
1299};
1300
1301static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r,
1302 unsigned int pkt_num)
1303{
1304 return ((u64)pkt_num * r->mult) >> r->shift;
1305}
1306
1307void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64);
1308
1309/* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1310 * The fast path only needs to access filter list and to update stats
1311 */
1312struct mini_Qdisc {
1313 struct tcf_proto *filter_list;
1314 struct tcf_block *block;
1315 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1316 struct gnet_stats_queue __percpu *cpu_qstats;
1317 struct rcu_head rcu;
1318};
1319
1320static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1321 const struct sk_buff *skb)
1322{
1323 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1324}
1325
1326static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1327{
1328 this_cpu_inc(miniq->cpu_qstats->drops);
1329}
1330
1331struct mini_Qdisc_pair {
1332 struct mini_Qdisc miniq1;
1333 struct mini_Qdisc miniq2;
1334 struct mini_Qdisc __rcu **p_miniq;
1335};
1336
1337void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1338 struct tcf_proto *tp_head);
1339void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1340 struct mini_Qdisc __rcu **p_miniq);
1341void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1342 struct tcf_block *block);
1343
1344int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));
1345
1346#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 <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
23struct Qdisc_ops;
24struct qdisc_walker;
25struct tcf_walker;
26struct module;
27struct bpf_flow_keys;
28
29struct qdisc_rate_table {
30 struct tc_ratespec rate;
31 u32 data[256];
32 struct qdisc_rate_table *next;
33 int refcnt;
34};
35
36enum qdisc_state_t {
37 __QDISC_STATE_SCHED,
38 __QDISC_STATE_DEACTIVATED,
39};
40
41struct qdisc_size_table {
42 struct rcu_head rcu;
43 struct list_head list;
44 struct tc_sizespec szopts;
45 int refcnt;
46 u16 data[];
47};
48
49/* similar to sk_buff_head, but skb->prev pointer is undefined. */
50struct qdisc_skb_head {
51 struct sk_buff *head;
52 struct sk_buff *tail;
53 __u32 qlen;
54 spinlock_t lock;
55};
56
57struct Qdisc {
58 int (*enqueue)(struct sk_buff *skb,
59 struct Qdisc *sch,
60 struct sk_buff **to_free);
61 struct sk_buff * (*dequeue)(struct Qdisc *sch);
62 unsigned int flags;
63#define TCQ_F_BUILTIN 1
64#define TCQ_F_INGRESS 2
65#define TCQ_F_CAN_BYPASS 4
66#define TCQ_F_MQROOT 8
67#define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
68 * q->dev_queue : It can test
69 * netif_xmit_frozen_or_stopped() before
70 * dequeueing next packet.
71 * Its true for MQ/MQPRIO slaves, or non
72 * multiqueue device.
73 */
74#define TCQ_F_WARN_NONWC (1 << 16)
75#define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
76#define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
77 * qdisc_tree_decrease_qlen() should stop.
78 */
79#define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
80#define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
81#define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
82 u32 limit;
83 const struct Qdisc_ops *ops;
84 struct qdisc_size_table __rcu *stab;
85 struct hlist_node hash;
86 u32 handle;
87 u32 parent;
88
89 struct netdev_queue *dev_queue;
90
91 struct net_rate_estimator __rcu *rate_est;
92 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
93 struct gnet_stats_queue __percpu *cpu_qstats;
94 int padded;
95 refcount_t refcnt;
96
97 /*
98 * For performance sake on SMP, we put highly modified fields at the end
99 */
100 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
101 struct qdisc_skb_head q;
102 struct gnet_stats_basic_packed bstats;
103 seqcount_t running;
104 struct gnet_stats_queue qstats;
105 unsigned long state;
106 struct Qdisc *next_sched;
107 struct sk_buff_head skb_bad_txq;
108
109 spinlock_t busylock ____cacheline_aligned_in_smp;
110 spinlock_t seqlock;
111
112 /* for NOLOCK qdisc, true if there are no enqueued skbs */
113 bool empty;
114 struct rcu_head rcu;
115};
116
117static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
118{
119 if (qdisc->flags & TCQ_F_BUILTIN)
120 return;
121 refcount_inc(&qdisc->refcnt);
122}
123
124/* Intended to be used by unlocked users, when concurrent qdisc release is
125 * possible.
126 */
127
128static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
129{
130 if (qdisc->flags & TCQ_F_BUILTIN)
131 return qdisc;
132 if (refcount_inc_not_zero(&qdisc->refcnt))
133 return qdisc;
134 return NULL;
135}
136
137static inline bool qdisc_is_running(struct Qdisc *qdisc)
138{
139 if (qdisc->flags & TCQ_F_NOLOCK)
140 return spin_is_locked(&qdisc->seqlock);
141 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
142}
143
144static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
145{
146 return q->flags & TCQ_F_CPUSTATS;
147}
148
149static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
150{
151 if (qdisc_is_percpu_stats(qdisc))
152 return qdisc->empty;
153 return !qdisc->q.qlen;
154}
155
156static inline bool qdisc_run_begin(struct Qdisc *qdisc)
157{
158 if (qdisc->flags & TCQ_F_NOLOCK) {
159 if (!spin_trylock(&qdisc->seqlock))
160 return false;
161 qdisc->empty = false;
162 } else if (qdisc_is_running(qdisc)) {
163 return false;
164 }
165 /* Variant of write_seqcount_begin() telling lockdep a trylock
166 * was attempted.
167 */
168 raw_write_seqcount_begin(&qdisc->running);
169 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
170 return true;
171}
172
173static inline void qdisc_run_end(struct Qdisc *qdisc)
174{
175 write_seqcount_end(&qdisc->running);
176 if (qdisc->flags & TCQ_F_NOLOCK)
177 spin_unlock(&qdisc->seqlock);
178}
179
180static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
181{
182 return qdisc->flags & TCQ_F_ONETXQUEUE;
183}
184
185static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
186{
187#ifdef CONFIG_BQL
188 /* Non-BQL migrated drivers will return 0, too. */
189 return dql_avail(&txq->dql);
190#else
191 return 0;
192#endif
193}
194
195struct Qdisc_class_ops {
196 unsigned int flags;
197 /* Child qdisc manipulation */
198 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
199 int (*graft)(struct Qdisc *, unsigned long cl,
200 struct Qdisc *, struct Qdisc **,
201 struct netlink_ext_ack *extack);
202 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
203 void (*qlen_notify)(struct Qdisc *, unsigned long);
204
205 /* Class manipulation routines */
206 unsigned long (*find)(struct Qdisc *, u32 classid);
207 int (*change)(struct Qdisc *, u32, u32,
208 struct nlattr **, unsigned long *,
209 struct netlink_ext_ack *);
210 int (*delete)(struct Qdisc *, unsigned long);
211 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
212
213 /* Filter manipulation */
214 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
215 unsigned long arg,
216 struct netlink_ext_ack *extack);
217 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
218 u32 classid);
219 void (*unbind_tcf)(struct Qdisc *, unsigned long);
220
221 /* rtnetlink specific */
222 int (*dump)(struct Qdisc *, unsigned long,
223 struct sk_buff *skb, struct tcmsg*);
224 int (*dump_stats)(struct Qdisc *, unsigned long,
225 struct gnet_dump *);
226};
227
228/* Qdisc_class_ops flag values */
229
230/* Implements API that doesn't require rtnl lock */
231enum qdisc_class_ops_flags {
232 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
233};
234
235struct Qdisc_ops {
236 struct Qdisc_ops *next;
237 const struct Qdisc_class_ops *cl_ops;
238 char id[IFNAMSIZ];
239 int priv_size;
240 unsigned int static_flags;
241
242 int (*enqueue)(struct sk_buff *skb,
243 struct Qdisc *sch,
244 struct sk_buff **to_free);
245 struct sk_buff * (*dequeue)(struct Qdisc *);
246 struct sk_buff * (*peek)(struct Qdisc *);
247
248 int (*init)(struct Qdisc *sch, struct nlattr *arg,
249 struct netlink_ext_ack *extack);
250 void (*reset)(struct Qdisc *);
251 void (*destroy)(struct Qdisc *);
252 int (*change)(struct Qdisc *sch,
253 struct nlattr *arg,
254 struct netlink_ext_ack *extack);
255 void (*attach)(struct Qdisc *sch);
256 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
257
258 int (*dump)(struct Qdisc *, struct sk_buff *);
259 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
260
261 void (*ingress_block_set)(struct Qdisc *sch,
262 u32 block_index);
263 void (*egress_block_set)(struct Qdisc *sch,
264 u32 block_index);
265 u32 (*ingress_block_get)(struct Qdisc *sch);
266 u32 (*egress_block_get)(struct Qdisc *sch);
267
268 struct module *owner;
269};
270
271
272struct tcf_result {
273 union {
274 struct {
275 unsigned long class;
276 u32 classid;
277 };
278 const struct tcf_proto *goto_tp;
279
280 /* used in the skb_tc_reinsert function */
281 struct {
282 bool ingress;
283 struct gnet_stats_queue *qstats;
284 };
285 };
286};
287
288struct tcf_chain;
289
290struct tcf_proto_ops {
291 struct list_head head;
292 char kind[IFNAMSIZ];
293
294 int (*classify)(struct sk_buff *,
295 const struct tcf_proto *,
296 struct tcf_result *);
297 int (*init)(struct tcf_proto*);
298 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
299 struct netlink_ext_ack *extack);
300
301 void* (*get)(struct tcf_proto*, u32 handle);
302 void (*put)(struct tcf_proto *tp, void *f);
303 int (*change)(struct net *net, struct sk_buff *,
304 struct tcf_proto*, unsigned long,
305 u32 handle, struct nlattr **,
306 void **, bool, bool,
307 struct netlink_ext_ack *);
308 int (*delete)(struct tcf_proto *tp, void *arg,
309 bool *last, bool rtnl_held,
310 struct netlink_ext_ack *);
311 void (*walk)(struct tcf_proto *tp,
312 struct tcf_walker *arg, bool rtnl_held);
313 int (*reoffload)(struct tcf_proto *tp, bool add,
314 flow_setup_cb_t *cb, void *cb_priv,
315 struct netlink_ext_ack *extack);
316 void (*hw_add)(struct tcf_proto *tp,
317 void *type_data);
318 void (*hw_del)(struct tcf_proto *tp,
319 void *type_data);
320 void (*bind_class)(void *, u32, unsigned long);
321 void * (*tmplt_create)(struct net *net,
322 struct tcf_chain *chain,
323 struct nlattr **tca,
324 struct netlink_ext_ack *extack);
325 void (*tmplt_destroy)(void *tmplt_priv);
326
327 /* rtnetlink specific */
328 int (*dump)(struct net*, struct tcf_proto*, void *,
329 struct sk_buff *skb, struct tcmsg*,
330 bool);
331 int (*tmplt_dump)(struct sk_buff *skb,
332 struct net *net,
333 void *tmplt_priv);
334
335 struct module *owner;
336 int flags;
337};
338
339enum tcf_proto_ops_flags {
340 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
341};
342
343struct tcf_proto {
344 /* Fast access part */
345 struct tcf_proto __rcu *next;
346 void __rcu *root;
347
348 /* called under RCU BH lock*/
349 int (*classify)(struct sk_buff *,
350 const struct tcf_proto *,
351 struct tcf_result *);
352 __be16 protocol;
353
354 /* All the rest */
355 u32 prio;
356 void *data;
357 const struct tcf_proto_ops *ops;
358 struct tcf_chain *chain;
359 /* Lock protects tcf_proto shared state and can be used by unlocked
360 * classifiers to protect their private data.
361 */
362 spinlock_t lock;
363 bool deleting;
364 refcount_t refcnt;
365 struct rcu_head rcu;
366 struct hlist_node destroy_ht_node;
367};
368
369struct qdisc_skb_cb {
370 struct {
371 unsigned int pkt_len;
372 u16 slave_dev_queue_mapping;
373 u16 tc_classid;
374 };
375#define QDISC_CB_PRIV_LEN 20
376 unsigned char data[QDISC_CB_PRIV_LEN];
377};
378
379typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
380
381struct tcf_chain {
382 /* Protects filter_chain. */
383 struct mutex filter_chain_lock;
384 struct tcf_proto __rcu *filter_chain;
385 struct list_head list;
386 struct tcf_block *block;
387 u32 index; /* chain index */
388 unsigned int refcnt;
389 unsigned int action_refcnt;
390 bool explicitly_created;
391 bool flushing;
392 const struct tcf_proto_ops *tmplt_ops;
393 void *tmplt_priv;
394 struct rcu_head rcu;
395};
396
397struct tcf_block {
398 /* Lock protects tcf_block and lifetime-management data of chains
399 * attached to the block (refcnt, action_refcnt, explicitly_created).
400 */
401 struct mutex lock;
402 struct list_head chain_list;
403 u32 index; /* block index for shared blocks */
404 refcount_t refcnt;
405 struct net *net;
406 struct Qdisc *q;
407 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
408 struct flow_block flow_block;
409 struct list_head owner_list;
410 bool keep_dst;
411 atomic_t offloadcnt; /* Number of oddloaded filters */
412 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
413 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
414 struct {
415 struct tcf_chain *chain;
416 struct list_head filter_chain_list;
417 } chain0;
418 struct rcu_head rcu;
419 DECLARE_HASHTABLE(proto_destroy_ht, 7);
420 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
421};
422
423#ifdef CONFIG_PROVE_LOCKING
424static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
425{
426 return lockdep_is_held(&chain->filter_chain_lock);
427}
428
429static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
430{
431 return lockdep_is_held(&tp->lock);
432}
433#else
434static inline bool lockdep_tcf_chain_is_locked(struct tcf_block *chain)
435{
436 return true;
437}
438
439static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
440{
441 return true;
442}
443#endif /* #ifdef CONFIG_PROVE_LOCKING */
444
445#define tcf_chain_dereference(p, chain) \
446 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
447
448#define tcf_proto_dereference(p, tp) \
449 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
450
451static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
452{
453 struct qdisc_skb_cb *qcb;
454
455 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
456 BUILD_BUG_ON(sizeof(qcb->data) < sz);
457}
458
459static inline int qdisc_qlen_cpu(const struct Qdisc *q)
460{
461 return this_cpu_ptr(q->cpu_qstats)->qlen;
462}
463
464static inline int qdisc_qlen(const struct Qdisc *q)
465{
466 return q->q.qlen;
467}
468
469static inline int qdisc_qlen_sum(const struct Qdisc *q)
470{
471 __u32 qlen = q->qstats.qlen;
472 int i;
473
474 if (qdisc_is_percpu_stats(q)) {
475 for_each_possible_cpu(i)
476 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
477 } else {
478 qlen += q->q.qlen;
479 }
480
481 return qlen;
482}
483
484static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
485{
486 return (struct qdisc_skb_cb *)skb->cb;
487}
488
489static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
490{
491 return &qdisc->q.lock;
492}
493
494static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
495{
496 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
497
498 return q;
499}
500
501static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
502{
503 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
504}
505
506static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
507{
508 return qdisc->dev_queue->qdisc_sleeping;
509}
510
511/* The qdisc root lock is a mechanism by which to top level
512 * of a qdisc tree can be locked from any qdisc node in the
513 * forest. This allows changing the configuration of some
514 * aspect of the qdisc tree while blocking out asynchronous
515 * qdisc access in the packet processing paths.
516 *
517 * It is only legal to do this when the root will not change
518 * on us. Otherwise we'll potentially lock the wrong qdisc
519 * root. This is enforced by holding the RTNL semaphore, which
520 * all users of this lock accessor must do.
521 */
522static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
523{
524 struct Qdisc *root = qdisc_root(qdisc);
525
526 ASSERT_RTNL();
527 return qdisc_lock(root);
528}
529
530static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
531{
532 struct Qdisc *root = qdisc_root_sleeping(qdisc);
533
534 ASSERT_RTNL();
535 return qdisc_lock(root);
536}
537
538static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
539{
540 struct Qdisc *root = qdisc_root_sleeping(qdisc);
541
542 ASSERT_RTNL();
543 return &root->running;
544}
545
546static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
547{
548 return qdisc->dev_queue->dev;
549}
550
551static inline void sch_tree_lock(const struct Qdisc *q)
552{
553 spin_lock_bh(qdisc_root_sleeping_lock(q));
554}
555
556static inline void sch_tree_unlock(const struct Qdisc *q)
557{
558 spin_unlock_bh(qdisc_root_sleeping_lock(q));
559}
560
561extern struct Qdisc noop_qdisc;
562extern struct Qdisc_ops noop_qdisc_ops;
563extern struct Qdisc_ops pfifo_fast_ops;
564extern struct Qdisc_ops mq_qdisc_ops;
565extern struct Qdisc_ops noqueue_qdisc_ops;
566extern const struct Qdisc_ops *default_qdisc_ops;
567static inline const struct Qdisc_ops *
568get_default_qdisc_ops(const struct net_device *dev, int ntx)
569{
570 return ntx < dev->real_num_tx_queues ?
571 default_qdisc_ops : &pfifo_fast_ops;
572}
573
574struct Qdisc_class_common {
575 u32 classid;
576 struct hlist_node hnode;
577};
578
579struct Qdisc_class_hash {
580 struct hlist_head *hash;
581 unsigned int hashsize;
582 unsigned int hashmask;
583 unsigned int hashelems;
584};
585
586static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
587{
588 id ^= id >> 8;
589 id ^= id >> 4;
590 return id & mask;
591}
592
593static inline struct Qdisc_class_common *
594qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
595{
596 struct Qdisc_class_common *cl;
597 unsigned int h;
598
599 if (!id)
600 return NULL;
601
602 h = qdisc_class_hash(id, hash->hashmask);
603 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
604 if (cl->classid == id)
605 return cl;
606 }
607 return NULL;
608}
609
610static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
611{
612 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
613
614 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
615}
616
617int qdisc_class_hash_init(struct Qdisc_class_hash *);
618void qdisc_class_hash_insert(struct Qdisc_class_hash *,
619 struct Qdisc_class_common *);
620void qdisc_class_hash_remove(struct Qdisc_class_hash *,
621 struct Qdisc_class_common *);
622void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
623void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
624
625int dev_qdisc_change_tx_queue_len(struct net_device *dev);
626void dev_init_scheduler(struct net_device *dev);
627void dev_shutdown(struct net_device *dev);
628void dev_activate(struct net_device *dev);
629void dev_deactivate(struct net_device *dev);
630void dev_deactivate_many(struct list_head *head);
631struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
632 struct Qdisc *qdisc);
633void qdisc_reset(struct Qdisc *qdisc);
634void qdisc_put(struct Qdisc *qdisc);
635void qdisc_put_unlocked(struct Qdisc *qdisc);
636void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
637#ifdef CONFIG_NET_SCHED
638int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
639 void *type_data);
640void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
641 struct Qdisc *new, struct Qdisc *old,
642 enum tc_setup_type type, void *type_data,
643 struct netlink_ext_ack *extack);
644#else
645static inline int
646qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
647 void *type_data)
648{
649 q->flags &= ~TCQ_F_OFFLOADED;
650 return 0;
651}
652
653static inline void
654qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
655 struct Qdisc *new, struct Qdisc *old,
656 enum tc_setup_type type, void *type_data,
657 struct netlink_ext_ack *extack)
658{
659}
660#endif
661struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
662 const struct Qdisc_ops *ops,
663 struct netlink_ext_ack *extack);
664void qdisc_free(struct Qdisc *qdisc);
665struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
666 const struct Qdisc_ops *ops, u32 parentid,
667 struct netlink_ext_ack *extack);
668void __qdisc_calculate_pkt_len(struct sk_buff *skb,
669 const struct qdisc_size_table *stab);
670int skb_do_redirect(struct sk_buff *);
671
672static inline void skb_reset_tc(struct sk_buff *skb)
673{
674#ifdef CONFIG_NET_CLS_ACT
675 skb->tc_redirected = 0;
676#endif
677}
678
679static inline bool skb_is_tc_redirected(const struct sk_buff *skb)
680{
681#ifdef CONFIG_NET_CLS_ACT
682 return skb->tc_redirected;
683#else
684 return false;
685#endif
686}
687
688static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
689{
690#ifdef CONFIG_NET_CLS_ACT
691 return skb->tc_at_ingress;
692#else
693 return false;
694#endif
695}
696
697static inline bool skb_skip_tc_classify(struct sk_buff *skb)
698{
699#ifdef CONFIG_NET_CLS_ACT
700 if (skb->tc_skip_classify) {
701 skb->tc_skip_classify = 0;
702 return true;
703 }
704#endif
705 return false;
706}
707
708/* Reset all TX qdiscs greater than index of a device. */
709static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
710{
711 struct Qdisc *qdisc;
712
713 for (; i < dev->num_tx_queues; i++) {
714 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
715 if (qdisc) {
716 spin_lock_bh(qdisc_lock(qdisc));
717 qdisc_reset(qdisc);
718 spin_unlock_bh(qdisc_lock(qdisc));
719 }
720 }
721}
722
723static inline void qdisc_reset_all_tx(struct net_device *dev)
724{
725 qdisc_reset_all_tx_gt(dev, 0);
726}
727
728/* Are all TX queues of the device empty? */
729static inline bool qdisc_all_tx_empty(const struct net_device *dev)
730{
731 unsigned int i;
732
733 rcu_read_lock();
734 for (i = 0; i < dev->num_tx_queues; i++) {
735 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
736 const struct Qdisc *q = rcu_dereference(txq->qdisc);
737
738 if (!qdisc_is_empty(q)) {
739 rcu_read_unlock();
740 return false;
741 }
742 }
743 rcu_read_unlock();
744 return true;
745}
746
747/* Are any of the TX qdiscs changing? */
748static inline bool qdisc_tx_changing(const struct net_device *dev)
749{
750 unsigned int i;
751
752 for (i = 0; i < dev->num_tx_queues; i++) {
753 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
754 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
755 return true;
756 }
757 return false;
758}
759
760/* Is the device using the noop qdisc on all queues? */
761static inline bool qdisc_tx_is_noop(const struct net_device *dev)
762{
763 unsigned int i;
764
765 for (i = 0; i < dev->num_tx_queues; i++) {
766 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
767 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
768 return false;
769 }
770 return true;
771}
772
773static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
774{
775 return qdisc_skb_cb(skb)->pkt_len;
776}
777
778/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
779enum net_xmit_qdisc_t {
780 __NET_XMIT_STOLEN = 0x00010000,
781 __NET_XMIT_BYPASS = 0x00020000,
782};
783
784#ifdef CONFIG_NET_CLS_ACT
785#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
786#else
787#define net_xmit_drop_count(e) (1)
788#endif
789
790static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
791 const struct Qdisc *sch)
792{
793#ifdef CONFIG_NET_SCHED
794 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
795
796 if (stab)
797 __qdisc_calculate_pkt_len(skb, stab);
798#endif
799}
800
801static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
802 struct sk_buff **to_free)
803{
804 qdisc_calculate_pkt_len(skb, sch);
805 return sch->enqueue(skb, sch, to_free);
806}
807
808static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
809 __u64 bytes, __u32 packets)
810{
811 bstats->bytes += bytes;
812 bstats->packets += packets;
813}
814
815static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
816 const struct sk_buff *skb)
817{
818 _bstats_update(bstats,
819 qdisc_pkt_len(skb),
820 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
821}
822
823static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
824 __u64 bytes, __u32 packets)
825{
826 u64_stats_update_begin(&bstats->syncp);
827 _bstats_update(&bstats->bstats, bytes, packets);
828 u64_stats_update_end(&bstats->syncp);
829}
830
831static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
832 const struct sk_buff *skb)
833{
834 u64_stats_update_begin(&bstats->syncp);
835 bstats_update(&bstats->bstats, skb);
836 u64_stats_update_end(&bstats->syncp);
837}
838
839static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
840 const struct sk_buff *skb)
841{
842 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
843}
844
845static inline void qdisc_bstats_update(struct Qdisc *sch,
846 const struct sk_buff *skb)
847{
848 bstats_update(&sch->bstats, skb);
849}
850
851static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
852 const struct sk_buff *skb)
853{
854 sch->qstats.backlog -= qdisc_pkt_len(skb);
855}
856
857static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
858 const struct sk_buff *skb)
859{
860 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
861}
862
863static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
864 const struct sk_buff *skb)
865{
866 sch->qstats.backlog += qdisc_pkt_len(skb);
867}
868
869static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
870 const struct sk_buff *skb)
871{
872 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
873}
874
875static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
876{
877 this_cpu_inc(sch->cpu_qstats->qlen);
878}
879
880static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
881{
882 this_cpu_dec(sch->cpu_qstats->qlen);
883}
884
885static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
886{
887 this_cpu_inc(sch->cpu_qstats->requeues);
888}
889
890static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
891{
892 sch->qstats.drops += count;
893}
894
895static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
896{
897 qstats->drops++;
898}
899
900static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
901{
902 qstats->overlimits++;
903}
904
905static inline void qdisc_qstats_drop(struct Qdisc *sch)
906{
907 qstats_drop_inc(&sch->qstats);
908}
909
910static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
911{
912 this_cpu_inc(sch->cpu_qstats->drops);
913}
914
915static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
916{
917 sch->qstats.overlimits++;
918}
919
920static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
921{
922 __u32 qlen = qdisc_qlen_sum(sch);
923
924 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
925}
926
927static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
928 __u32 *backlog)
929{
930 struct gnet_stats_queue qstats = { 0 };
931 __u32 len = qdisc_qlen_sum(sch);
932
933 __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
934 *qlen = qstats.qlen;
935 *backlog = qstats.backlog;
936}
937
938static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
939{
940 __u32 qlen, backlog;
941
942 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
943 qdisc_tree_reduce_backlog(sch, qlen, backlog);
944}
945
946static inline void qdisc_purge_queue(struct Qdisc *sch)
947{
948 __u32 qlen, backlog;
949
950 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
951 qdisc_reset(sch);
952 qdisc_tree_reduce_backlog(sch, qlen, backlog);
953}
954
955static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
956{
957 qh->head = NULL;
958 qh->tail = NULL;
959 qh->qlen = 0;
960}
961
962static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
963 struct qdisc_skb_head *qh)
964{
965 struct sk_buff *last = qh->tail;
966
967 if (last) {
968 skb->next = NULL;
969 last->next = skb;
970 qh->tail = skb;
971 } else {
972 qh->tail = skb;
973 qh->head = skb;
974 }
975 qh->qlen++;
976}
977
978static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
979{
980 __qdisc_enqueue_tail(skb, &sch->q);
981 qdisc_qstats_backlog_inc(sch, skb);
982 return NET_XMIT_SUCCESS;
983}
984
985static inline void __qdisc_enqueue_head(struct sk_buff *skb,
986 struct qdisc_skb_head *qh)
987{
988 skb->next = qh->head;
989
990 if (!qh->head)
991 qh->tail = skb;
992 qh->head = skb;
993 qh->qlen++;
994}
995
996static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
997{
998 struct sk_buff *skb = qh->head;
999
1000 if (likely(skb != NULL)) {
1001 qh->head = skb->next;
1002 qh->qlen--;
1003 if (qh->head == NULL)
1004 qh->tail = NULL;
1005 skb->next = NULL;
1006 }
1007
1008 return skb;
1009}
1010
1011static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1012{
1013 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1014
1015 if (likely(skb != NULL)) {
1016 qdisc_qstats_backlog_dec(sch, skb);
1017 qdisc_bstats_update(sch, skb);
1018 }
1019
1020 return skb;
1021}
1022
1023/* Instead of calling kfree_skb() while root qdisc lock is held,
1024 * queue the skb for future freeing at end of __dev_xmit_skb()
1025 */
1026static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1027{
1028 skb->next = *to_free;
1029 *to_free = skb;
1030}
1031
1032static inline void __qdisc_drop_all(struct sk_buff *skb,
1033 struct sk_buff **to_free)
1034{
1035 if (skb->prev)
1036 skb->prev->next = *to_free;
1037 else
1038 skb->next = *to_free;
1039 *to_free = skb;
1040}
1041
1042static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1043 struct qdisc_skb_head *qh,
1044 struct sk_buff **to_free)
1045{
1046 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1047
1048 if (likely(skb != NULL)) {
1049 unsigned int len = qdisc_pkt_len(skb);
1050
1051 qdisc_qstats_backlog_dec(sch, skb);
1052 __qdisc_drop(skb, to_free);
1053 return len;
1054 }
1055
1056 return 0;
1057}
1058
1059static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
1060 struct sk_buff **to_free)
1061{
1062 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
1063}
1064
1065static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1066{
1067 const struct qdisc_skb_head *qh = &sch->q;
1068
1069 return qh->head;
1070}
1071
1072/* generic pseudo peek method for non-work-conserving qdisc */
1073static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1074{
1075 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1076
1077 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1078 if (!skb) {
1079 skb = sch->dequeue(sch);
1080
1081 if (skb) {
1082 __skb_queue_head(&sch->gso_skb, skb);
1083 /* it's still part of the queue */
1084 qdisc_qstats_backlog_inc(sch, skb);
1085 sch->q.qlen++;
1086 }
1087 }
1088
1089 return skb;
1090}
1091
1092static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1093 struct sk_buff *skb)
1094{
1095 if (qdisc_is_percpu_stats(sch)) {
1096 qdisc_qstats_cpu_backlog_dec(sch, skb);
1097 qdisc_bstats_cpu_update(sch, skb);
1098 qdisc_qstats_cpu_qlen_dec(sch);
1099 } else {
1100 qdisc_qstats_backlog_dec(sch, skb);
1101 qdisc_bstats_update(sch, skb);
1102 sch->q.qlen--;
1103 }
1104}
1105
1106static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1107 unsigned int pkt_len)
1108{
1109 if (qdisc_is_percpu_stats(sch)) {
1110 qdisc_qstats_cpu_qlen_inc(sch);
1111 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1112 } else {
1113 sch->qstats.backlog += pkt_len;
1114 sch->q.qlen++;
1115 }
1116}
1117
1118/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1119static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1120{
1121 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1122
1123 if (skb) {
1124 skb = __skb_dequeue(&sch->gso_skb);
1125 if (qdisc_is_percpu_stats(sch)) {
1126 qdisc_qstats_cpu_backlog_dec(sch, skb);
1127 qdisc_qstats_cpu_qlen_dec(sch);
1128 } else {
1129 qdisc_qstats_backlog_dec(sch, skb);
1130 sch->q.qlen--;
1131 }
1132 } else {
1133 skb = sch->dequeue(sch);
1134 }
1135
1136 return skb;
1137}
1138
1139static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1140{
1141 /*
1142 * We do not know the backlog in bytes of this list, it
1143 * is up to the caller to correct it
1144 */
1145 ASSERT_RTNL();
1146 if (qh->qlen) {
1147 rtnl_kfree_skbs(qh->head, qh->tail);
1148
1149 qh->head = NULL;
1150 qh->tail = NULL;
1151 qh->qlen = 0;
1152 }
1153}
1154
1155static inline void qdisc_reset_queue(struct Qdisc *sch)
1156{
1157 __qdisc_reset_queue(&sch->q);
1158 sch->qstats.backlog = 0;
1159}
1160
1161static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1162 struct Qdisc **pold)
1163{
1164 struct Qdisc *old;
1165
1166 sch_tree_lock(sch);
1167 old = *pold;
1168 *pold = new;
1169 if (old != NULL)
1170 qdisc_tree_flush_backlog(old);
1171 sch_tree_unlock(sch);
1172
1173 return old;
1174}
1175
1176static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1177{
1178 rtnl_kfree_skbs(skb, skb);
1179 qdisc_qstats_drop(sch);
1180}
1181
1182static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1183 struct sk_buff **to_free)
1184{
1185 __qdisc_drop(skb, to_free);
1186 qdisc_qstats_cpu_drop(sch);
1187
1188 return NET_XMIT_DROP;
1189}
1190
1191static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1192 struct sk_buff **to_free)
1193{
1194 __qdisc_drop(skb, to_free);
1195 qdisc_qstats_drop(sch);
1196
1197 return NET_XMIT_DROP;
1198}
1199
1200static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1201 struct sk_buff **to_free)
1202{
1203 __qdisc_drop_all(skb, to_free);
1204 qdisc_qstats_drop(sch);
1205
1206 return NET_XMIT_DROP;
1207}
1208
1209/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1210 long it will take to send a packet given its size.
1211 */
1212static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1213{
1214 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1215 if (slot < 0)
1216 slot = 0;
1217 slot >>= rtab->rate.cell_log;
1218 if (slot > 255)
1219 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1220 return rtab->data[slot];
1221}
1222
1223struct psched_ratecfg {
1224 u64 rate_bytes_ps; /* bytes per second */
1225 u32 mult;
1226 u16 overhead;
1227 u8 linklayer;
1228 u8 shift;
1229};
1230
1231static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1232 unsigned int len)
1233{
1234 len += r->overhead;
1235
1236 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1237 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1238
1239 return ((u64)len * r->mult) >> r->shift;
1240}
1241
1242void psched_ratecfg_precompute(struct psched_ratecfg *r,
1243 const struct tc_ratespec *conf,
1244 u64 rate64);
1245
1246static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1247 const struct psched_ratecfg *r)
1248{
1249 memset(res, 0, sizeof(*res));
1250
1251 /* legacy struct tc_ratespec has a 32bit @rate field
1252 * Qdisc using 64bit rate should add new attributes
1253 * in order to maintain compatibility.
1254 */
1255 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1256
1257 res->overhead = r->overhead;
1258 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1259}
1260
1261/* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1262 * The fast path only needs to access filter list and to update stats
1263 */
1264struct mini_Qdisc {
1265 struct tcf_proto *filter_list;
1266 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1267 struct gnet_stats_queue __percpu *cpu_qstats;
1268 struct rcu_head rcu;
1269};
1270
1271static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1272 const struct sk_buff *skb)
1273{
1274 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1275}
1276
1277static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1278{
1279 this_cpu_inc(miniq->cpu_qstats->drops);
1280}
1281
1282struct mini_Qdisc_pair {
1283 struct mini_Qdisc miniq1;
1284 struct mini_Qdisc miniq2;
1285 struct mini_Qdisc __rcu **p_miniq;
1286};
1287
1288void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1289 struct tcf_proto *tp_head);
1290void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1291 struct mini_Qdisc __rcu **p_miniq);
1292
1293static inline void skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res)
1294{
1295 struct gnet_stats_queue *stats = res->qstats;
1296 int ret;
1297
1298 if (res->ingress)
1299 ret = netif_receive_skb(skb);
1300 else
1301 ret = dev_queue_xmit(skb);
1302 if (ret && stats)
1303 qstats_overlimit_inc(res->qstats);
1304}
1305
1306#endif