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Revert "tty: hvc: Fix data abort due to race in hvc_open"
[linux/fpc-iii.git] / include / net / sch_generic.h
blob8428aa6142655666715743e60bc74855f9f8d008
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 u32 classid; /* which class this block belongs to */
411 refcount_t refcnt;
412 struct net *net;
413 struct Qdisc *q;
414 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
415 struct flow_block flow_block;
416 struct list_head owner_list;
417 bool keep_dst;
418 atomic_t offloadcnt; /* Number of oddloaded filters */
419 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
420 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
421 struct {
422 struct tcf_chain *chain;
423 struct list_head filter_chain_list;
424 } chain0;
425 struct rcu_head rcu;
426 DECLARE_HASHTABLE(proto_destroy_ht, 7);
427 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
428 };
429
430 #ifdef CONFIG_PROVE_LOCKING
431 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
432 {
433 return lockdep_is_held(&chain->filter_chain_lock);
434 }
435
436 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
437 {
438 return lockdep_is_held(&tp->lock);
439 }
440 #else
441 static inline bool lockdep_tcf_chain_is_locked(struct tcf_block *chain)
442 {
443 return true;
444 }
445
446 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
447 {
448 return true;
449 }
450 #endif /* #ifdef CONFIG_PROVE_LOCKING */
451
452 #define tcf_chain_dereference(p, chain) \
453 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
454
455 #define tcf_proto_dereference(p, tp) \
456 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
457
458 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
459 {
460 struct qdisc_skb_cb *qcb;
461
462 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
463 BUILD_BUG_ON(sizeof(qcb->data) < sz);
464 }
465
466 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
467 {
468 return this_cpu_ptr(q->cpu_qstats)->qlen;
469 }
470
471 static inline int qdisc_qlen(const struct Qdisc *q)
472 {
473 return q->q.qlen;
474 }
475
476 static inline int qdisc_qlen_sum(const struct Qdisc *q)
477 {
478 __u32 qlen = q->qstats.qlen;
479 int i;
480
481 if (qdisc_is_percpu_stats(q)) {
482 for_each_possible_cpu(i)
483 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
484 } else {
485 qlen += q->q.qlen;
486 }
487
488 return qlen;
489 }
490
491 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
492 {
493 return (struct qdisc_skb_cb *)skb->cb;
494 }
495
496 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
497 {
498 return &qdisc->q.lock;
499 }
500
501 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
502 {
503 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
504
505 return q;
506 }
507
508 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
509 {
510 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
511 }
512
513 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
514 {
515 return qdisc->dev_queue->qdisc_sleeping;
516 }
517
518 /* The qdisc root lock is a mechanism by which to top level
519 * of a qdisc tree can be locked from any qdisc node in the
520 * forest. This allows changing the configuration of some
521 * aspect of the qdisc tree while blocking out asynchronous
522 * qdisc access in the packet processing paths.
523 *
524 * It is only legal to do this when the root will not change
525 * on us. Otherwise we'll potentially lock the wrong qdisc
526 * root. This is enforced by holding the RTNL semaphore, which
527 * all users of this lock accessor must do.
528 */
529 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
530 {
531 struct Qdisc *root = qdisc_root(qdisc);
532
533 ASSERT_RTNL();
534 return qdisc_lock(root);
535 }
536
537 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
538 {
539 struct Qdisc *root = qdisc_root_sleeping(qdisc);
540
541 ASSERT_RTNL();
542 return qdisc_lock(root);
543 }
544
545 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
546 {
547 struct Qdisc *root = qdisc_root_sleeping(qdisc);
548
549 ASSERT_RTNL();
550 return &root->running;
551 }
552
553 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
554 {
555 return qdisc->dev_queue->dev;
556 }
557
558 static inline void sch_tree_lock(const struct Qdisc *q)
559 {
560 spin_lock_bh(qdisc_root_sleeping_lock(q));
561 }
562
563 static inline void sch_tree_unlock(const struct Qdisc *q)
564 {
565 spin_unlock_bh(qdisc_root_sleeping_lock(q));
566 }
567
568 extern struct Qdisc noop_qdisc;
569 extern struct Qdisc_ops noop_qdisc_ops;
570 extern struct Qdisc_ops pfifo_fast_ops;
571 extern struct Qdisc_ops mq_qdisc_ops;
572 extern struct Qdisc_ops noqueue_qdisc_ops;
573 extern const struct Qdisc_ops *default_qdisc_ops;
574 static inline const struct Qdisc_ops *
575 get_default_qdisc_ops(const struct net_device *dev, int ntx)
576 {
577 return ntx < dev->real_num_tx_queues ?
578 default_qdisc_ops : &pfifo_fast_ops;
579 }
580
581 struct Qdisc_class_common {
582 u32 classid;
583 struct hlist_node hnode;
584 };
585
586 struct Qdisc_class_hash {
587 struct hlist_head *hash;
588 unsigned int hashsize;
589 unsigned int hashmask;
590 unsigned int hashelems;
591 };
592
593 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
594 {
595 id ^= id >> 8;
596 id ^= id >> 4;
597 return id & mask;
598 }
599
600 static inline struct Qdisc_class_common *
601 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
602 {
603 struct Qdisc_class_common *cl;
604 unsigned int h;
605
606 if (!id)
607 return NULL;
608
609 h = qdisc_class_hash(id, hash->hashmask);
610 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
611 if (cl->classid == id)
612 return cl;
613 }
614 return NULL;
615 }
616
617 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
618 {
619 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
620
621 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
622 }
623
624 int qdisc_class_hash_init(struct Qdisc_class_hash *);
625 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
626 struct Qdisc_class_common *);
627 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
628 struct Qdisc_class_common *);
629 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
630 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
631
632 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
633 void dev_init_scheduler(struct net_device *dev);
634 void dev_shutdown(struct net_device *dev);
635 void dev_activate(struct net_device *dev);
636 void dev_deactivate(struct net_device *dev);
637 void dev_deactivate_many(struct list_head *head);
638 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
639 struct Qdisc *qdisc);
640 void qdisc_reset(struct Qdisc *qdisc);
641 void qdisc_put(struct Qdisc *qdisc);
642 void qdisc_put_unlocked(struct Qdisc *qdisc);
643 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
644 #ifdef CONFIG_NET_SCHED
645 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
646 void *type_data);
647 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
648 struct Qdisc *new, struct Qdisc *old,
649 enum tc_setup_type type, void *type_data,
650 struct netlink_ext_ack *extack);
651 #else
652 static inline int
653 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
654 void *type_data)
655 {
656 q->flags &= ~TCQ_F_OFFLOADED;
657 return 0;
658 }
659
660 static inline void
661 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
662 struct Qdisc *new, struct Qdisc *old,
663 enum tc_setup_type type, void *type_data,
664 struct netlink_ext_ack *extack)
665 {
666 }
667 #endif
668 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
669 const struct Qdisc_ops *ops,
670 struct netlink_ext_ack *extack);
671 void qdisc_free(struct Qdisc *qdisc);
672 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
673 const struct Qdisc_ops *ops, u32 parentid,
674 struct netlink_ext_ack *extack);
675 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
676 const struct qdisc_size_table *stab);
677 int skb_do_redirect(struct sk_buff *);
678
679 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
680 {
681 #ifdef CONFIG_NET_CLS_ACT
682 return skb->tc_at_ingress;
683 #else
684 return false;
685 #endif
686 }
687
688 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
689 {
690 #ifdef CONFIG_NET_CLS_ACT
691 if (skb->tc_skip_classify) {
692 skb->tc_skip_classify = 0;
693 return true;
694 }
695 #endif
696 return false;
697 }
698
699 /* Reset all TX qdiscs greater than index of a device. */
700 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
701 {
702 struct Qdisc *qdisc;
703
704 for (; i < dev->num_tx_queues; i++) {
705 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
706 if (qdisc) {
707 spin_lock_bh(qdisc_lock(qdisc));
708 qdisc_reset(qdisc);
709 spin_unlock_bh(qdisc_lock(qdisc));
710 }
711 }
712 }
713
714 static inline void qdisc_reset_all_tx(struct net_device *dev)
715 {
716 qdisc_reset_all_tx_gt(dev, 0);
717 }
718
719 /* Are all TX queues of the device empty? */
720 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
721 {
722 unsigned int i;
723
724 rcu_read_lock();
725 for (i = 0; i < dev->num_tx_queues; i++) {
726 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
727 const struct Qdisc *q = rcu_dereference(txq->qdisc);
728
729 if (!qdisc_is_empty(q)) {
730 rcu_read_unlock();
731 return false;
732 }
733 }
734 rcu_read_unlock();
735 return true;
736 }
737
738 /* Are any of the TX qdiscs changing? */
739 static inline bool qdisc_tx_changing(const struct net_device *dev)
740 {
741 unsigned int i;
742
743 for (i = 0; i < dev->num_tx_queues; i++) {
744 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
745 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
746 return true;
747 }
748 return false;
749 }
750
751 /* Is the device using the noop qdisc on all queues? */
752 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
753 {
754 unsigned int i;
755
756 for (i = 0; i < dev->num_tx_queues; i++) {
757 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
758 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
759 return false;
760 }
761 return true;
762 }
763
764 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
765 {
766 return qdisc_skb_cb(skb)->pkt_len;
767 }
768
769 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
770 enum net_xmit_qdisc_t {
771 __NET_XMIT_STOLEN = 0x00010000,
772 __NET_XMIT_BYPASS = 0x00020000,
773 };
774
775 #ifdef CONFIG_NET_CLS_ACT
776 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
777 #else
778 #define net_xmit_drop_count(e) (1)
779 #endif
780
781 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
782 const struct Qdisc *sch)
783 {
784 #ifdef CONFIG_NET_SCHED
785 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
786
787 if (stab)
788 __qdisc_calculate_pkt_len(skb, stab);
789 #endif
790 }
791
792 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
793 struct sk_buff **to_free)
794 {
795 qdisc_calculate_pkt_len(skb, sch);
796 return sch->enqueue(skb, sch, to_free);
797 }
798
799 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
800 __u64 bytes, __u32 packets)
801 {
802 bstats->bytes += bytes;
803 bstats->packets += packets;
804 }
805
806 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
807 const struct sk_buff *skb)
808 {
809 _bstats_update(bstats,
810 qdisc_pkt_len(skb),
811 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
812 }
813
814 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
815 __u64 bytes, __u32 packets)
816 {
817 u64_stats_update_begin(&bstats->syncp);
818 _bstats_update(&bstats->bstats, bytes, packets);
819 u64_stats_update_end(&bstats->syncp);
820 }
821
822 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
823 const struct sk_buff *skb)
824 {
825 u64_stats_update_begin(&bstats->syncp);
826 bstats_update(&bstats->bstats, skb);
827 u64_stats_update_end(&bstats->syncp);
828 }
829
830 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
831 const struct sk_buff *skb)
832 {
833 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
834 }
835
836 static inline void qdisc_bstats_update(struct Qdisc *sch,
837 const struct sk_buff *skb)
838 {
839 bstats_update(&sch->bstats, skb);
840 }
841
842 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
843 const struct sk_buff *skb)
844 {
845 sch->qstats.backlog -= qdisc_pkt_len(skb);
846 }
847
848 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
849 const struct sk_buff *skb)
850 {
851 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
852 }
853
854 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
855 const struct sk_buff *skb)
856 {
857 sch->qstats.backlog += qdisc_pkt_len(skb);
858 }
859
860 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
861 const struct sk_buff *skb)
862 {
863 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
864 }
865
866 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
867 {
868 this_cpu_inc(sch->cpu_qstats->qlen);
869 }
870
871 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
872 {
873 this_cpu_dec(sch->cpu_qstats->qlen);
874 }
875
876 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
877 {
878 this_cpu_inc(sch->cpu_qstats->requeues);
879 }
880
881 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
882 {
883 sch->qstats.drops += count;
884 }
885
886 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
887 {
888 qstats->drops++;
889 }
890
891 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
892 {
893 qstats->overlimits++;
894 }
895
896 static inline void qdisc_qstats_drop(struct Qdisc *sch)
897 {
898 qstats_drop_inc(&sch->qstats);
899 }
900
901 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
902 {
903 this_cpu_inc(sch->cpu_qstats->drops);
904 }
905
906 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
907 {
908 sch->qstats.overlimits++;
909 }
910
911 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
912 {
913 __u32 qlen = qdisc_qlen_sum(sch);
914
915 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
916 }
917
918 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
919 __u32 *backlog)
920 {
921 struct gnet_stats_queue qstats = { 0 };
922 __u32 len = qdisc_qlen_sum(sch);
923
924 __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
925 *qlen = qstats.qlen;
926 *backlog = qstats.backlog;
927 }
928
929 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
930 {
931 __u32 qlen, backlog;
932
933 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
934 qdisc_tree_reduce_backlog(sch, qlen, backlog);
935 }
936
937 static inline void qdisc_purge_queue(struct Qdisc *sch)
938 {
939 __u32 qlen, backlog;
940
941 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
942 qdisc_reset(sch);
943 qdisc_tree_reduce_backlog(sch, qlen, backlog);
944 }
945
946 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
947 {
948 qh->head = NULL;
949 qh->tail = NULL;
950 qh->qlen = 0;
951 }
952
953 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
954 struct qdisc_skb_head *qh)
955 {
956 struct sk_buff *last = qh->tail;
957
958 if (last) {
959 skb->next = NULL;
960 last->next = skb;
961 qh->tail = skb;
962 } else {
963 qh->tail = skb;
964 qh->head = skb;
965 }
966 qh->qlen++;
967 }
968
969 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
970 {
971 __qdisc_enqueue_tail(skb, &sch->q);
972 qdisc_qstats_backlog_inc(sch, skb);
973 return NET_XMIT_SUCCESS;
974 }
975
976 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
977 struct qdisc_skb_head *qh)
978 {
979 skb->next = qh->head;
980
981 if (!qh->head)
982 qh->tail = skb;
983 qh->head = skb;
984 qh->qlen++;
985 }
986
987 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
988 {
989 struct sk_buff *skb = qh->head;
990
991 if (likely(skb != NULL)) {
992 qh->head = skb->next;
993 qh->qlen--;
994 if (qh->head == NULL)
995 qh->tail = NULL;
996 skb->next = NULL;
997 }
998
999 return skb;
1000 }
1001
1002 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1003 {
1004 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1005
1006 if (likely(skb != NULL)) {
1007 qdisc_qstats_backlog_dec(sch, skb);
1008 qdisc_bstats_update(sch, skb);
1009 }
1010
1011 return skb;
1012 }
1013
1014 /* Instead of calling kfree_skb() while root qdisc lock is held,
1015 * queue the skb for future freeing at end of __dev_xmit_skb()
1016 */
1017 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1018 {
1019 skb->next = *to_free;
1020 *to_free = skb;
1021 }
1022
1023 static inline void __qdisc_drop_all(struct sk_buff *skb,
1024 struct sk_buff **to_free)
1025 {
1026 if (skb->prev)
1027 skb->prev->next = *to_free;
1028 else
1029 skb->next = *to_free;
1030 *to_free = skb;
1031 }
1032
1033 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1034 struct qdisc_skb_head *qh,
1035 struct sk_buff **to_free)
1036 {
1037 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1038
1039 if (likely(skb != NULL)) {
1040 unsigned int len = qdisc_pkt_len(skb);
1041
1042 qdisc_qstats_backlog_dec(sch, skb);
1043 __qdisc_drop(skb, to_free);
1044 return len;
1045 }
1046
1047 return 0;
1048 }
1049
1050 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
1051 struct sk_buff **to_free)
1052 {
1053 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
1054 }
1055
1056 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1057 {
1058 const struct qdisc_skb_head *qh = &sch->q;
1059
1060 return qh->head;
1061 }
1062
1063 /* generic pseudo peek method for non-work-conserving qdisc */
1064 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1065 {
1066 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1067
1068 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1069 if (!skb) {
1070 skb = sch->dequeue(sch);
1071
1072 if (skb) {
1073 __skb_queue_head(&sch->gso_skb, skb);
1074 /* it's still part of the queue */
1075 qdisc_qstats_backlog_inc(sch, skb);
1076 sch->q.qlen++;
1077 }
1078 }
1079
1080 return skb;
1081 }
1082
1083 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1084 struct sk_buff *skb)
1085 {
1086 if (qdisc_is_percpu_stats(sch)) {
1087 qdisc_qstats_cpu_backlog_dec(sch, skb);
1088 qdisc_bstats_cpu_update(sch, skb);
1089 qdisc_qstats_cpu_qlen_dec(sch);
1090 } else {
1091 qdisc_qstats_backlog_dec(sch, skb);
1092 qdisc_bstats_update(sch, skb);
1093 sch->q.qlen--;
1094 }
1095 }
1096
1097 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1098 unsigned int pkt_len)
1099 {
1100 if (qdisc_is_percpu_stats(sch)) {
1101 qdisc_qstats_cpu_qlen_inc(sch);
1102 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1103 } else {
1104 sch->qstats.backlog += pkt_len;
1105 sch->q.qlen++;
1106 }
1107 }
1108
1109 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1110 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1111 {
1112 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1113
1114 if (skb) {
1115 skb = __skb_dequeue(&sch->gso_skb);
1116 if (qdisc_is_percpu_stats(sch)) {
1117 qdisc_qstats_cpu_backlog_dec(sch, skb);
1118 qdisc_qstats_cpu_qlen_dec(sch);
1119 } else {
1120 qdisc_qstats_backlog_dec(sch, skb);
1121 sch->q.qlen--;
1122 }
1123 } else {
1124 skb = sch->dequeue(sch);
1125 }
1126
1127 return skb;
1128 }
1129
1130 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1131 {
1132 /*
1133 * We do not know the backlog in bytes of this list, it
1134 * is up to the caller to correct it
1135 */
1136 ASSERT_RTNL();
1137 if (qh->qlen) {
1138 rtnl_kfree_skbs(qh->head, qh->tail);
1139
1140 qh->head = NULL;
1141 qh->tail = NULL;
1142 qh->qlen = 0;
1143 }
1144 }
1145
1146 static inline void qdisc_reset_queue(struct Qdisc *sch)
1147 {
1148 __qdisc_reset_queue(&sch->q);
1149 sch->qstats.backlog = 0;
1150 }
1151
1152 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1153 struct Qdisc **pold)
1154 {
1155 struct Qdisc *old;
1156
1157 sch_tree_lock(sch);
1158 old = *pold;
1159 *pold = new;
1160 if (old != NULL)
1161 qdisc_tree_flush_backlog(old);
1162 sch_tree_unlock(sch);
1163
1164 return old;
1165 }
1166
1167 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1168 {
1169 rtnl_kfree_skbs(skb, skb);
1170 qdisc_qstats_drop(sch);
1171 }
1172
1173 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1174 struct sk_buff **to_free)
1175 {
1176 __qdisc_drop(skb, to_free);
1177 qdisc_qstats_cpu_drop(sch);
1178
1179 return NET_XMIT_DROP;
1180 }
1181
1182 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1183 struct sk_buff **to_free)
1184 {
1185 __qdisc_drop(skb, to_free);
1186 qdisc_qstats_drop(sch);
1187
1188 return NET_XMIT_DROP;
1189 }
1190
1191 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1192 struct sk_buff **to_free)
1193 {
1194 __qdisc_drop_all(skb, to_free);
1195 qdisc_qstats_drop(sch);
1196
1197 return NET_XMIT_DROP;
1198 }
1199
1200 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1201 long it will take to send a packet given its size.
1202 */
1203 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1204 {
1205 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1206 if (slot < 0)
1207 slot = 0;
1208 slot >>= rtab->rate.cell_log;
1209 if (slot > 255)
1210 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1211 return rtab->data[slot];
1212 }
1213
1214 struct psched_ratecfg {
1215 u64 rate_bytes_ps; /* bytes per second */
1216 u32 mult;
1217 u16 overhead;
1218 u8 linklayer;
1219 u8 shift;
1220 };
1221
1222 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1223 unsigned int len)
1224 {
1225 len += r->overhead;
1226
1227 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1228 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1229
1230 return ((u64)len * r->mult) >> r->shift;
1231 }
1232
1233 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1234 const struct tc_ratespec *conf,
1235 u64 rate64);
1236
1237 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1238 const struct psched_ratecfg *r)
1239 {
1240 memset(res, 0, sizeof(*res));
1241
1242 /* legacy struct tc_ratespec has a 32bit @rate field
1243 * Qdisc using 64bit rate should add new attributes
1244 * in order to maintain compatibility.
1245 */
1246 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1247
1248 res->overhead = r->overhead;
1249 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1250 }
1251
1252 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1253 * The fast path only needs to access filter list and to update stats
1254 */
1255 struct mini_Qdisc {
1256 struct tcf_proto *filter_list;
1257 struct tcf_block *block;
1258 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1259 struct gnet_stats_queue __percpu *cpu_qstats;
1260 struct rcu_head rcu;
1261 };
1262
1263 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1264 const struct sk_buff *skb)
1265 {
1266 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1267 }
1268
1269 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1270 {
1271 this_cpu_inc(miniq->cpu_qstats->drops);
1272 }
1273
1274 struct mini_Qdisc_pair {
1275 struct mini_Qdisc miniq1;
1276 struct mini_Qdisc miniq2;
1277 struct mini_Qdisc __rcu **p_miniq;
1278 };
1279
1280 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1281 struct tcf_proto *tp_head);
1282 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1283 struct mini_Qdisc __rcu **p_miniq);
1284 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1285 struct tcf_block *block);
1286
1287 static inline int skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res)
1288 {
1289 return res->ingress ? netif_receive_skb(skb) : dev_queue_xmit(skb);
1290 }
1291
1292 #endif
Linux with added FPC-III support