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drm/panfrost: Remove set but not used variable 'bo'
[linux/fpc-iii.git] / include / net / sch_generic.h
blob151208704ed2e6d71c6a06afcd1473e68428c88b
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
23 struct Qdisc_ops;
24 struct qdisc_walker;
25 struct tcf_walker;
26 struct module;
27 struct bpf_flow_keys;
28
29 struct qdisc_rate_table {
30 struct tc_ratespec rate;
31 u32 data[256];
32 struct qdisc_rate_table *next;
33 int refcnt;
34 };
35
36 enum qdisc_state_t {
37 __QDISC_STATE_SCHED,
38 __QDISC_STATE_DEACTIVATED,
39 };
40
41 struct 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. */
50 struct qdisc_skb_head {
51 struct sk_buff *head;
52 struct sk_buff *tail;
53 __u32 qlen;
54 spinlock_t lock;
55 };
56
57 struct 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
117 static 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
128 static 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
137 static 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
144 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
145 {
146 return q->flags & TCQ_F_CPUSTATS;
147 }
148
149 static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
150 {
151 if (qdisc_is_percpu_stats(qdisc))
152 return READ_ONCE(qdisc->empty);
153 return !READ_ONCE(qdisc->q.qlen);
154 }
155
156 static 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 WRITE_ONCE(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
173 static 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
180 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
181 {
182 return qdisc->flags & TCQ_F_ONETXQUEUE;
183 }
184
185 static 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
195 struct 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 */
231 enum qdisc_class_ops_flags {
232 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
233 };
234
235 struct 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
272 struct 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
288 struct tcf_chain;
289
290 struct 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 bool (*delete_empty)(struct tcf_proto *tp);
312 void (*walk)(struct tcf_proto *tp,
313 struct tcf_walker *arg, bool rtnl_held);
314 int (*reoffload)(struct tcf_proto *tp, bool add,
315 flow_setup_cb_t *cb, void *cb_priv,
316 struct netlink_ext_ack *extack);
317 void (*hw_add)(struct tcf_proto *tp,
318 void *type_data);
319 void (*hw_del)(struct tcf_proto *tp,
320 void *type_data);
321 void (*bind_class)(void *, u32, unsigned long,
322 void *, unsigned long);
323 void * (*tmplt_create)(struct net *net,
324 struct tcf_chain *chain,
325 struct nlattr **tca,
326 struct netlink_ext_ack *extack);
327 void (*tmplt_destroy)(void *tmplt_priv);
328
329 /* rtnetlink specific */
330 int (*dump)(struct net*, struct tcf_proto*, void *,
331 struct sk_buff *skb, struct tcmsg*,
332 bool);
333 int (*tmplt_dump)(struct sk_buff *skb,
334 struct net *net,
335 void *tmplt_priv);
336
337 struct module *owner;
338 int flags;
339 };
340
341 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
342 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
343 * conditions can occur when filters are inserted/deleted simultaneously.
344 */
345 enum tcf_proto_ops_flags {
346 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
347 };
348
349 struct tcf_proto {
350 /* Fast access part */
351 struct tcf_proto __rcu *next;
352 void __rcu *root;
353
354 /* called under RCU BH lock*/
355 int (*classify)(struct sk_buff *,
356 const struct tcf_proto *,
357 struct tcf_result *);
358 __be16 protocol;
359
360 /* All the rest */
361 u32 prio;
362 void *data;
363 const struct tcf_proto_ops *ops;
364 struct tcf_chain *chain;
365 /* Lock protects tcf_proto shared state and can be used by unlocked
366 * classifiers to protect their private data.
367 */
368 spinlock_t lock;
369 bool deleting;
370 refcount_t refcnt;
371 struct rcu_head rcu;
372 struct hlist_node destroy_ht_node;
373 };
374
375 struct qdisc_skb_cb {
376 struct {
377 unsigned int pkt_len;
378 u16 slave_dev_queue_mapping;
379 u16 tc_classid;
380 };
381 #define QDISC_CB_PRIV_LEN 20
382 unsigned char data[QDISC_CB_PRIV_LEN];
383 };
384
385 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
386
387 struct tcf_chain {
388 /* Protects filter_chain. */
389 struct mutex filter_chain_lock;
390 struct tcf_proto __rcu *filter_chain;
391 struct list_head list;
392 struct tcf_block *block;
393 u32 index; /* chain index */
394 unsigned int refcnt;
395 unsigned int action_refcnt;
396 bool explicitly_created;
397 bool flushing;
398 const struct tcf_proto_ops *tmplt_ops;
399 void *tmplt_priv;
400 struct rcu_head rcu;
401 };
402
403 struct tcf_block {
404 /* Lock protects tcf_block and lifetime-management data of chains
405 * attached to the block (refcnt, action_refcnt, explicitly_created).
406 */
407 struct mutex lock;
408 struct list_head chain_list;
409 u32 index; /* block index for shared blocks */
410 refcount_t refcnt;
411 struct net *net;
412 struct Qdisc *q;
413 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
414 struct flow_block flow_block;
415 struct list_head owner_list;
416 bool keep_dst;
417 atomic_t offloadcnt; /* Number of oddloaded filters */
418 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
419 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
420 struct {
421 struct tcf_chain *chain;
422 struct list_head filter_chain_list;
423 } chain0;
424 struct rcu_head rcu;
425 DECLARE_HASHTABLE(proto_destroy_ht, 7);
426 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
427 };
428
429 #ifdef CONFIG_PROVE_LOCKING
430 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
431 {
432 return lockdep_is_held(&chain->filter_chain_lock);
433 }
434
435 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
436 {
437 return lockdep_is_held(&tp->lock);
438 }
439 #else
440 static inline bool lockdep_tcf_chain_is_locked(struct tcf_block *chain)
441 {
442 return true;
443 }
444
445 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
446 {
447 return true;
448 }
449 #endif /* #ifdef CONFIG_PROVE_LOCKING */
450
451 #define tcf_chain_dereference(p, chain) \
452 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
453
454 #define tcf_proto_dereference(p, tp) \
455 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
456
457 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
458 {
459 struct qdisc_skb_cb *qcb;
460
461 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
462 BUILD_BUG_ON(sizeof(qcb->data) < sz);
463 }
464
465 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
466 {
467 return this_cpu_ptr(q->cpu_qstats)->qlen;
468 }
469
470 static inline int qdisc_qlen(const struct Qdisc *q)
471 {
472 return q->q.qlen;
473 }
474
475 static inline int qdisc_qlen_sum(const struct Qdisc *q)
476 {
477 __u32 qlen = q->qstats.qlen;
478 int i;
479
480 if (qdisc_is_percpu_stats(q)) {
481 for_each_possible_cpu(i)
482 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
483 } else {
484 qlen += q->q.qlen;
485 }
486
487 return qlen;
488 }
489
490 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
491 {
492 return (struct qdisc_skb_cb *)skb->cb;
493 }
494
495 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
496 {
497 return &qdisc->q.lock;
498 }
499
500 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
501 {
502 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
503
504 return q;
505 }
506
507 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
508 {
509 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
510 }
511
512 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
513 {
514 return qdisc->dev_queue->qdisc_sleeping;
515 }
516
517 /* The qdisc root lock is a mechanism by which to top level
518 * of a qdisc tree can be locked from any qdisc node in the
519 * forest. This allows changing the configuration of some
520 * aspect of the qdisc tree while blocking out asynchronous
521 * qdisc access in the packet processing paths.
522 *
523 * It is only legal to do this when the root will not change
524 * on us. Otherwise we'll potentially lock the wrong qdisc
525 * root. This is enforced by holding the RTNL semaphore, which
526 * all users of this lock accessor must do.
527 */
528 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
529 {
530 struct Qdisc *root = qdisc_root(qdisc);
531
532 ASSERT_RTNL();
533 return qdisc_lock(root);
534 }
535
536 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
537 {
538 struct Qdisc *root = qdisc_root_sleeping(qdisc);
539
540 ASSERT_RTNL();
541 return qdisc_lock(root);
542 }
543
544 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
545 {
546 struct Qdisc *root = qdisc_root_sleeping(qdisc);
547
548 ASSERT_RTNL();
549 return &root->running;
550 }
551
552 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
553 {
554 return qdisc->dev_queue->dev;
555 }
556
557 static inline void sch_tree_lock(const struct Qdisc *q)
558 {
559 spin_lock_bh(qdisc_root_sleeping_lock(q));
560 }
561
562 static inline void sch_tree_unlock(const struct Qdisc *q)
563 {
564 spin_unlock_bh(qdisc_root_sleeping_lock(q));
565 }
566
567 extern struct Qdisc noop_qdisc;
568 extern struct Qdisc_ops noop_qdisc_ops;
569 extern struct Qdisc_ops pfifo_fast_ops;
570 extern struct Qdisc_ops mq_qdisc_ops;
571 extern struct Qdisc_ops noqueue_qdisc_ops;
572 extern const struct Qdisc_ops *default_qdisc_ops;
573 static inline const struct Qdisc_ops *
574 get_default_qdisc_ops(const struct net_device *dev, int ntx)
575 {
576 return ntx < dev->real_num_tx_queues ?
577 default_qdisc_ops : &pfifo_fast_ops;
578 }
579
580 struct Qdisc_class_common {
581 u32 classid;
582 struct hlist_node hnode;
583 };
584
585 struct Qdisc_class_hash {
586 struct hlist_head *hash;
587 unsigned int hashsize;
588 unsigned int hashmask;
589 unsigned int hashelems;
590 };
591
592 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
593 {
594 id ^= id >> 8;
595 id ^= id >> 4;
596 return id & mask;
597 }
598
599 static inline struct Qdisc_class_common *
600 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
601 {
602 struct Qdisc_class_common *cl;
603 unsigned int h;
604
605 if (!id)
606 return NULL;
607
608 h = qdisc_class_hash(id, hash->hashmask);
609 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
610 if (cl->classid == id)
611 return cl;
612 }
613 return NULL;
614 }
615
616 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
617 {
618 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
619
620 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
621 }
622
623 int qdisc_class_hash_init(struct Qdisc_class_hash *);
624 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
625 struct Qdisc_class_common *);
626 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
627 struct Qdisc_class_common *);
628 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
629 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
630
631 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
632 void dev_init_scheduler(struct net_device *dev);
633 void dev_shutdown(struct net_device *dev);
634 void dev_activate(struct net_device *dev);
635 void dev_deactivate(struct net_device *dev);
636 void dev_deactivate_many(struct list_head *head);
637 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
638 struct Qdisc *qdisc);
639 void qdisc_reset(struct Qdisc *qdisc);
640 void qdisc_put(struct Qdisc *qdisc);
641 void qdisc_put_unlocked(struct Qdisc *qdisc);
642 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
643 #ifdef CONFIG_NET_SCHED
644 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
645 void *type_data);
646 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
647 struct Qdisc *new, struct Qdisc *old,
648 enum tc_setup_type type, void *type_data,
649 struct netlink_ext_ack *extack);
650 #else
651 static inline int
652 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
653 void *type_data)
654 {
655 q->flags &= ~TCQ_F_OFFLOADED;
656 return 0;
657 }
658
659 static inline void
660 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
661 struct Qdisc *new, struct Qdisc *old,
662 enum tc_setup_type type, void *type_data,
663 struct netlink_ext_ack *extack)
664 {
665 }
666 #endif
667 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
668 const struct Qdisc_ops *ops,
669 struct netlink_ext_ack *extack);
670 void qdisc_free(struct Qdisc *qdisc);
671 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
672 const struct Qdisc_ops *ops, u32 parentid,
673 struct netlink_ext_ack *extack);
674 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
675 const struct qdisc_size_table *stab);
676 int skb_do_redirect(struct sk_buff *);
677
678 static inline void skb_reset_tc(struct sk_buff *skb)
679 {
680 #ifdef CONFIG_NET_CLS_ACT
681 skb->tc_redirected = 0;
682 #endif
683 }
684
685 static inline bool skb_is_tc_redirected(const struct sk_buff *skb)
686 {
687 #ifdef CONFIG_NET_CLS_ACT
688 return skb->tc_redirected;
689 #else
690 return false;
691 #endif
692 }
693
694 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
695 {
696 #ifdef CONFIG_NET_CLS_ACT
697 return skb->tc_at_ingress;
698 #else
699 return false;
700 #endif
701 }
702
703 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
704 {
705 #ifdef CONFIG_NET_CLS_ACT
706 if (skb->tc_skip_classify) {
707 skb->tc_skip_classify = 0;
708 return true;
709 }
710 #endif
711 return false;
712 }
713
714 /* Reset all TX qdiscs greater than index of a device. */
715 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
716 {
717 struct Qdisc *qdisc;
718
719 for (; i < dev->num_tx_queues; i++) {
720 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
721 if (qdisc) {
722 spin_lock_bh(qdisc_lock(qdisc));
723 qdisc_reset(qdisc);
724 spin_unlock_bh(qdisc_lock(qdisc));
725 }
726 }
727 }
728
729 static inline void qdisc_reset_all_tx(struct net_device *dev)
730 {
731 qdisc_reset_all_tx_gt(dev, 0);
732 }
733
734 /* Are all TX queues of the device empty? */
735 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
736 {
737 unsigned int i;
738
739 rcu_read_lock();
740 for (i = 0; i < dev->num_tx_queues; i++) {
741 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
742 const struct Qdisc *q = rcu_dereference(txq->qdisc);
743
744 if (!qdisc_is_empty(q)) {
745 rcu_read_unlock();
746 return false;
747 }
748 }
749 rcu_read_unlock();
750 return true;
751 }
752
753 /* Are any of the TX qdiscs changing? */
754 static inline bool qdisc_tx_changing(const struct net_device *dev)
755 {
756 unsigned int i;
757
758 for (i = 0; i < dev->num_tx_queues; i++) {
759 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
760 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
761 return true;
762 }
763 return false;
764 }
765
766 /* Is the device using the noop qdisc on all queues? */
767 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
768 {
769 unsigned int i;
770
771 for (i = 0; i < dev->num_tx_queues; i++) {
772 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
773 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
774 return false;
775 }
776 return true;
777 }
778
779 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
780 {
781 return qdisc_skb_cb(skb)->pkt_len;
782 }
783
784 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
785 enum net_xmit_qdisc_t {
786 __NET_XMIT_STOLEN = 0x00010000,
787 __NET_XMIT_BYPASS = 0x00020000,
788 };
789
790 #ifdef CONFIG_NET_CLS_ACT
791 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
792 #else
793 #define net_xmit_drop_count(e) (1)
794 #endif
795
796 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
797 const struct Qdisc *sch)
798 {
799 #ifdef CONFIG_NET_SCHED
800 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
801
802 if (stab)
803 __qdisc_calculate_pkt_len(skb, stab);
804 #endif
805 }
806
807 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
808 struct sk_buff **to_free)
809 {
810 qdisc_calculate_pkt_len(skb, sch);
811 return sch->enqueue(skb, sch, to_free);
812 }
813
814 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
815 __u64 bytes, __u32 packets)
816 {
817 bstats->bytes += bytes;
818 bstats->packets += packets;
819 }
820
821 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
822 const struct sk_buff *skb)
823 {
824 _bstats_update(bstats,
825 qdisc_pkt_len(skb),
826 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
827 }
828
829 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
830 __u64 bytes, __u32 packets)
831 {
832 u64_stats_update_begin(&bstats->syncp);
833 _bstats_update(&bstats->bstats, bytes, packets);
834 u64_stats_update_end(&bstats->syncp);
835 }
836
837 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
838 const struct sk_buff *skb)
839 {
840 u64_stats_update_begin(&bstats->syncp);
841 bstats_update(&bstats->bstats, skb);
842 u64_stats_update_end(&bstats->syncp);
843 }
844
845 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
846 const struct sk_buff *skb)
847 {
848 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
849 }
850
851 static inline void qdisc_bstats_update(struct Qdisc *sch,
852 const struct sk_buff *skb)
853 {
854 bstats_update(&sch->bstats, skb);
855 }
856
857 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
858 const struct sk_buff *skb)
859 {
860 sch->qstats.backlog -= qdisc_pkt_len(skb);
861 }
862
863 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
864 const struct sk_buff *skb)
865 {
866 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
867 }
868
869 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
870 const struct sk_buff *skb)
871 {
872 sch->qstats.backlog += qdisc_pkt_len(skb);
873 }
874
875 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
876 const struct sk_buff *skb)
877 {
878 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
879 }
880
881 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
882 {
883 this_cpu_inc(sch->cpu_qstats->qlen);
884 }
885
886 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
887 {
888 this_cpu_dec(sch->cpu_qstats->qlen);
889 }
890
891 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
892 {
893 this_cpu_inc(sch->cpu_qstats->requeues);
894 }
895
896 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
897 {
898 sch->qstats.drops += count;
899 }
900
901 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
902 {
903 qstats->drops++;
904 }
905
906 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
907 {
908 qstats->overlimits++;
909 }
910
911 static inline void qdisc_qstats_drop(struct Qdisc *sch)
912 {
913 qstats_drop_inc(&sch->qstats);
914 }
915
916 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
917 {
918 this_cpu_inc(sch->cpu_qstats->drops);
919 }
920
921 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
922 {
923 sch->qstats.overlimits++;
924 }
925
926 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
927 {
928 __u32 qlen = qdisc_qlen_sum(sch);
929
930 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
931 }
932
933 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
934 __u32 *backlog)
935 {
936 struct gnet_stats_queue qstats = { 0 };
937 __u32 len = qdisc_qlen_sum(sch);
938
939 __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
940 *qlen = qstats.qlen;
941 *backlog = qstats.backlog;
942 }
943
944 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
945 {
946 __u32 qlen, backlog;
947
948 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
949 qdisc_tree_reduce_backlog(sch, qlen, backlog);
950 }
951
952 static inline void qdisc_purge_queue(struct Qdisc *sch)
953 {
954 __u32 qlen, backlog;
955
956 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
957 qdisc_reset(sch);
958 qdisc_tree_reduce_backlog(sch, qlen, backlog);
959 }
960
961 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
962 {
963 qh->head = NULL;
964 qh->tail = NULL;
965 qh->qlen = 0;
966 }
967
968 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
969 struct qdisc_skb_head *qh)
970 {
971 struct sk_buff *last = qh->tail;
972
973 if (last) {
974 skb->next = NULL;
975 last->next = skb;
976 qh->tail = skb;
977 } else {
978 qh->tail = skb;
979 qh->head = skb;
980 }
981 qh->qlen++;
982 }
983
984 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
985 {
986 __qdisc_enqueue_tail(skb, &sch->q);
987 qdisc_qstats_backlog_inc(sch, skb);
988 return NET_XMIT_SUCCESS;
989 }
990
991 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
992 struct qdisc_skb_head *qh)
993 {
994 skb->next = qh->head;
995
996 if (!qh->head)
997 qh->tail = skb;
998 qh->head = skb;
999 qh->qlen++;
1000 }
1001
1002 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
1003 {
1004 struct sk_buff *skb = qh->head;
1005
1006 if (likely(skb != NULL)) {
1007 qh->head = skb->next;
1008 qh->qlen--;
1009 if (qh->head == NULL)
1010 qh->tail = NULL;
1011 skb->next = NULL;
1012 }
1013
1014 return skb;
1015 }
1016
1017 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1018 {
1019 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1020
1021 if (likely(skb != NULL)) {
1022 qdisc_qstats_backlog_dec(sch, skb);
1023 qdisc_bstats_update(sch, skb);
1024 }
1025
1026 return skb;
1027 }
1028
1029 /* Instead of calling kfree_skb() while root qdisc lock is held,
1030 * queue the skb for future freeing at end of __dev_xmit_skb()
1031 */
1032 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1033 {
1034 skb->next = *to_free;
1035 *to_free = skb;
1036 }
1037
1038 static inline void __qdisc_drop_all(struct sk_buff *skb,
1039 struct sk_buff **to_free)
1040 {
1041 if (skb->prev)
1042 skb->prev->next = *to_free;
1043 else
1044 skb->next = *to_free;
1045 *to_free = skb;
1046 }
1047
1048 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1049 struct qdisc_skb_head *qh,
1050 struct sk_buff **to_free)
1051 {
1052 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1053
1054 if (likely(skb != NULL)) {
1055 unsigned int len = qdisc_pkt_len(skb);
1056
1057 qdisc_qstats_backlog_dec(sch, skb);
1058 __qdisc_drop(skb, to_free);
1059 return len;
1060 }
1061
1062 return 0;
1063 }
1064
1065 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
1066 struct sk_buff **to_free)
1067 {
1068 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
1069 }
1070
1071 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1072 {
1073 const struct qdisc_skb_head *qh = &sch->q;
1074
1075 return qh->head;
1076 }
1077
1078 /* generic pseudo peek method for non-work-conserving qdisc */
1079 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1080 {
1081 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1082
1083 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1084 if (!skb) {
1085 skb = sch->dequeue(sch);
1086
1087 if (skb) {
1088 __skb_queue_head(&sch->gso_skb, skb);
1089 /* it's still part of the queue */
1090 qdisc_qstats_backlog_inc(sch, skb);
1091 sch->q.qlen++;
1092 }
1093 }
1094
1095 return skb;
1096 }
1097
1098 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1099 struct sk_buff *skb)
1100 {
1101 if (qdisc_is_percpu_stats(sch)) {
1102 qdisc_qstats_cpu_backlog_dec(sch, skb);
1103 qdisc_bstats_cpu_update(sch, skb);
1104 qdisc_qstats_cpu_qlen_dec(sch);
1105 } else {
1106 qdisc_qstats_backlog_dec(sch, skb);
1107 qdisc_bstats_update(sch, skb);
1108 sch->q.qlen--;
1109 }
1110 }
1111
1112 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1113 unsigned int pkt_len)
1114 {
1115 if (qdisc_is_percpu_stats(sch)) {
1116 qdisc_qstats_cpu_qlen_inc(sch);
1117 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1118 } else {
1119 sch->qstats.backlog += pkt_len;
1120 sch->q.qlen++;
1121 }
1122 }
1123
1124 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1125 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1126 {
1127 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1128
1129 if (skb) {
1130 skb = __skb_dequeue(&sch->gso_skb);
1131 if (qdisc_is_percpu_stats(sch)) {
1132 qdisc_qstats_cpu_backlog_dec(sch, skb);
1133 qdisc_qstats_cpu_qlen_dec(sch);
1134 } else {
1135 qdisc_qstats_backlog_dec(sch, skb);
1136 sch->q.qlen--;
1137 }
1138 } else {
1139 skb = sch->dequeue(sch);
1140 }
1141
1142 return skb;
1143 }
1144
1145 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1146 {
1147 /*
1148 * We do not know the backlog in bytes of this list, it
1149 * is up to the caller to correct it
1150 */
1151 ASSERT_RTNL();
1152 if (qh->qlen) {
1153 rtnl_kfree_skbs(qh->head, qh->tail);
1154
1155 qh->head = NULL;
1156 qh->tail = NULL;
1157 qh->qlen = 0;
1158 }
1159 }
1160
1161 static inline void qdisc_reset_queue(struct Qdisc *sch)
1162 {
1163 __qdisc_reset_queue(&sch->q);
1164 sch->qstats.backlog = 0;
1165 }
1166
1167 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1168 struct Qdisc **pold)
1169 {
1170 struct Qdisc *old;
1171
1172 sch_tree_lock(sch);
1173 old = *pold;
1174 *pold = new;
1175 if (old != NULL)
1176 qdisc_tree_flush_backlog(old);
1177 sch_tree_unlock(sch);
1178
1179 return old;
1180 }
1181
1182 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1183 {
1184 rtnl_kfree_skbs(skb, skb);
1185 qdisc_qstats_drop(sch);
1186 }
1187
1188 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1189 struct sk_buff **to_free)
1190 {
1191 __qdisc_drop(skb, to_free);
1192 qdisc_qstats_cpu_drop(sch);
1193
1194 return NET_XMIT_DROP;
1195 }
1196
1197 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1198 struct sk_buff **to_free)
1199 {
1200 __qdisc_drop(skb, to_free);
1201 qdisc_qstats_drop(sch);
1202
1203 return NET_XMIT_DROP;
1204 }
1205
1206 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1207 struct sk_buff **to_free)
1208 {
1209 __qdisc_drop_all(skb, to_free);
1210 qdisc_qstats_drop(sch);
1211
1212 return NET_XMIT_DROP;
1213 }
1214
1215 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1216 long it will take to send a packet given its size.
1217 */
1218 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1219 {
1220 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1221 if (slot < 0)
1222 slot = 0;
1223 slot >>= rtab->rate.cell_log;
1224 if (slot > 255)
1225 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1226 return rtab->data[slot];
1227 }
1228
1229 struct psched_ratecfg {
1230 u64 rate_bytes_ps; /* bytes per second */
1231 u32 mult;
1232 u16 overhead;
1233 u8 linklayer;
1234 u8 shift;
1235 };
1236
1237 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1238 unsigned int len)
1239 {
1240 len += r->overhead;
1241
1242 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1243 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1244
1245 return ((u64)len * r->mult) >> r->shift;
1246 }
1247
1248 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1249 const struct tc_ratespec *conf,
1250 u64 rate64);
1251
1252 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1253 const struct psched_ratecfg *r)
1254 {
1255 memset(res, 0, sizeof(*res));
1256
1257 /* legacy struct tc_ratespec has a 32bit @rate field
1258 * Qdisc using 64bit rate should add new attributes
1259 * in order to maintain compatibility.
1260 */
1261 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1262
1263 res->overhead = r->overhead;
1264 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1265 }
1266
1267 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1268 * The fast path only needs to access filter list and to update stats
1269 */
1270 struct mini_Qdisc {
1271 struct tcf_proto *filter_list;
1272 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1273 struct gnet_stats_queue __percpu *cpu_qstats;
1274 struct rcu_head rcu;
1275 };
1276
1277 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1278 const struct sk_buff *skb)
1279 {
1280 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1281 }
1282
1283 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1284 {
1285 this_cpu_inc(miniq->cpu_qstats->drops);
1286 }
1287
1288 struct mini_Qdisc_pair {
1289 struct mini_Qdisc miniq1;
1290 struct mini_Qdisc miniq2;
1291 struct mini_Qdisc __rcu **p_miniq;
1292 };
1293
1294 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1295 struct tcf_proto *tp_head);
1296 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1297 struct mini_Qdisc __rcu **p_miniq);
1298
1299 static inline int skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res)
1300 {
1301 return res->ingress ? netif_receive_skb(skb) : dev_queue_xmit(skb);
1302 }
1303
1304 #endif
Linux with added FPC-III support