]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - include/net/sch_generic.h
projects / mirror_ubuntu-jammy-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[mirror_ubuntu-jammy-kernel.git] / include / net / sch_generic.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __NET_SCHED_GENERIC_H
3 #define __NET_SCHED_GENERIC_H
4
5 #include <linux/netdevice.h>
6 #include <linux/types.h>
7 #include <linux/rcupdate.h>
8 #include <linux/pkt_sched.h>
9 #include <linux/pkt_cls.h>
10 #include <linux/percpu.h>
11 #include <linux/dynamic_queue_limits.h>
12 #include <linux/list.h>
13 #include <linux/refcount.h>
14 #include <linux/workqueue.h>
15 #include <net/gen_stats.h>
16 #include <net/rtnetlink.h>
17
18 struct Qdisc_ops;
19 struct qdisc_walker;
20 struct tcf_walker;
21 struct module;
22
23 struct qdisc_rate_table {
24 struct tc_ratespec rate;
25 u32 data[256];
26 struct qdisc_rate_table *next;
27 int refcnt;
28 };
29
30 enum qdisc_state_t {
31 __QDISC_STATE_SCHED,
32 __QDISC_STATE_DEACTIVATED,
33 };
34
35 struct qdisc_size_table {
36 struct rcu_head rcu;
37 struct list_head list;
38 struct tc_sizespec szopts;
39 int refcnt;
40 u16 data[];
41 };
42
43 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
44 struct qdisc_skb_head {
45 struct sk_buff *head;
46 struct sk_buff *tail;
47 __u32 qlen;
48 spinlock_t lock;
49 };
50
51 struct Qdisc {
52 int (*enqueue)(struct sk_buff *skb,
53 struct Qdisc *sch,
54 struct sk_buff **to_free);
55 struct sk_buff * (*dequeue)(struct Qdisc *sch);
56 unsigned int flags;
57 #define TCQ_F_BUILTIN 1
58 #define TCQ_F_INGRESS 2
59 #define TCQ_F_CAN_BYPASS 4
60 #define TCQ_F_MQROOT 8
61 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
62 * q->dev_queue : It can test
63 * netif_xmit_frozen_or_stopped() before
64 * dequeueing next packet.
65 * Its true for MQ/MQPRIO slaves, or non
66 * multiqueue device.
67 */
68 #define TCQ_F_WARN_NONWC (1 << 16)
69 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
70 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
71 * qdisc_tree_decrease_qlen() should stop.
72 */
73 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
74 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
75 u32 limit;
76 const struct Qdisc_ops *ops;
77 struct qdisc_size_table __rcu *stab;
78 struct hlist_node hash;
79 u32 handle;
80 u32 parent;
81
82 struct netdev_queue *dev_queue;
83
84 struct net_rate_estimator __rcu *rate_est;
85 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
86 struct gnet_stats_queue __percpu *cpu_qstats;
87
88 /*
89 * For performance sake on SMP, we put highly modified fields at the end
90 */
91 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
92 struct qdisc_skb_head q;
93 struct gnet_stats_basic_packed bstats;
94 seqcount_t running;
95 struct gnet_stats_queue qstats;
96 unsigned long state;
97 struct Qdisc *next_sched;
98 struct sk_buff_head skb_bad_txq;
99 int padded;
100 refcount_t refcnt;
101
102 spinlock_t busylock ____cacheline_aligned_in_smp;
103 };
104
105 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
106 {
107 if (qdisc->flags & TCQ_F_BUILTIN)
108 return;
109 refcount_inc(&qdisc->refcnt);
110 }
111
112 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
113 {
114 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
115 }
116
117 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
118 {
119 if (qdisc_is_running(qdisc))
120 return false;
121 /* Variant of write_seqcount_begin() telling lockdep a trylock
122 * was attempted.
123 */
124 raw_write_seqcount_begin(&qdisc->running);
125 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
126 return true;
127 }
128
129 static inline void qdisc_run_end(struct Qdisc *qdisc)
130 {
131 write_seqcount_end(&qdisc->running);
132 }
133
134 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
135 {
136 return qdisc->flags & TCQ_F_ONETXQUEUE;
137 }
138
139 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
140 {
141 #ifdef CONFIG_BQL
142 /* Non-BQL migrated drivers will return 0, too. */
143 return dql_avail(&txq->dql);
144 #else
145 return 0;
146 #endif
147 }
148
149 struct Qdisc_class_ops {
150 /* Child qdisc manipulation */
151 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
152 int (*graft)(struct Qdisc *, unsigned long cl,
153 struct Qdisc *, struct Qdisc **);
154 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
155 void (*qlen_notify)(struct Qdisc *, unsigned long);
156
157 /* Class manipulation routines */
158 unsigned long (*find)(struct Qdisc *, u32 classid);
159 int (*change)(struct Qdisc *, u32, u32,
160 struct nlattr **, unsigned long *);
161 int (*delete)(struct Qdisc *, unsigned long);
162 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
163
164 /* Filter manipulation */
165 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
166 unsigned long arg);
167 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
168 u32 classid);
169 void (*unbind_tcf)(struct Qdisc *, unsigned long);
170
171 /* rtnetlink specific */
172 int (*dump)(struct Qdisc *, unsigned long,
173 struct sk_buff *skb, struct tcmsg*);
174 int (*dump_stats)(struct Qdisc *, unsigned long,
175 struct gnet_dump *);
176 };
177
178 struct Qdisc_ops {
179 struct Qdisc_ops *next;
180 const struct Qdisc_class_ops *cl_ops;
181 char id[IFNAMSIZ];
182 int priv_size;
183 unsigned int static_flags;
184
185 int (*enqueue)(struct sk_buff *skb,
186 struct Qdisc *sch,
187 struct sk_buff **to_free);
188 struct sk_buff * (*dequeue)(struct Qdisc *);
189 struct sk_buff * (*peek)(struct Qdisc *);
190
191 int (*init)(struct Qdisc *sch, struct nlattr *arg);
192 void (*reset)(struct Qdisc *);
193 void (*destroy)(struct Qdisc *);
194 int (*change)(struct Qdisc *sch,
195 struct nlattr *arg);
196 void (*attach)(struct Qdisc *sch);
197
198 int (*dump)(struct Qdisc *, struct sk_buff *);
199 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
200
201 struct module *owner;
202 };
203
204
205 struct tcf_result {
206 union {
207 struct {
208 unsigned long class;
209 u32 classid;
210 };
211 const struct tcf_proto *goto_tp;
212 };
213 };
214
215 struct tcf_proto_ops {
216 struct list_head head;
217 char kind[IFNAMSIZ];
218
219 int (*classify)(struct sk_buff *,
220 const struct tcf_proto *,
221 struct tcf_result *);
222 int (*init)(struct tcf_proto*);
223 void (*destroy)(struct tcf_proto*);
224
225 void* (*get)(struct tcf_proto*, u32 handle);
226 int (*change)(struct net *net, struct sk_buff *,
227 struct tcf_proto*, unsigned long,
228 u32 handle, struct nlattr **,
229 void **, bool);
230 int (*delete)(struct tcf_proto*, void *, bool*);
231 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
232 void (*bind_class)(void *, u32, unsigned long);
233
234 /* rtnetlink specific */
235 int (*dump)(struct net*, struct tcf_proto*, void *,
236 struct sk_buff *skb, struct tcmsg*);
237
238 struct module *owner;
239 };
240
241 struct tcf_proto {
242 /* Fast access part */
243 struct tcf_proto __rcu *next;
244 void __rcu *root;
245 int (*classify)(struct sk_buff *,
246 const struct tcf_proto *,
247 struct tcf_result *);
248 __be16 protocol;
249
250 /* All the rest */
251 u32 prio;
252 u32 classid;
253 struct Qdisc *q;
254 void *data;
255 const struct tcf_proto_ops *ops;
256 struct tcf_chain *chain;
257 struct rcu_head rcu;
258 };
259
260 struct qdisc_skb_cb {
261 unsigned int pkt_len;
262 u16 slave_dev_queue_mapping;
263 u16 tc_classid;
264 #define QDISC_CB_PRIV_LEN 20
265 unsigned char data[QDISC_CB_PRIV_LEN];
266 };
267
268 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
269
270 struct tcf_chain {
271 struct tcf_proto __rcu *filter_chain;
272 tcf_chain_head_change_t *chain_head_change;
273 void *chain_head_change_priv;
274 struct list_head list;
275 struct tcf_block *block;
276 u32 index; /* chain index */
277 unsigned int refcnt;
278 };
279
280 struct tcf_block {
281 struct list_head chain_list;
282 struct net *net;
283 struct Qdisc *q;
284 struct list_head cb_list;
285 };
286
287 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
288 {
289 struct qdisc_skb_cb *qcb;
290
291 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
292 BUILD_BUG_ON(sizeof(qcb->data) < sz);
293 }
294
295 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
296 {
297 return this_cpu_ptr(q->cpu_qstats)->qlen;
298 }
299
300 static inline int qdisc_qlen(const struct Qdisc *q)
301 {
302 return q->q.qlen;
303 }
304
305 static inline int qdisc_qlen_sum(const struct Qdisc *q)
306 {
307 __u32 qlen = 0;
308 int i;
309
310 if (q->flags & TCQ_F_NOLOCK) {
311 for_each_possible_cpu(i)
312 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
313 } else {
314 qlen = q->q.qlen;
315 }
316
317 return qlen;
318 }
319
320 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
321 {
322 return (struct qdisc_skb_cb *)skb->cb;
323 }
324
325 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
326 {
327 return &qdisc->q.lock;
328 }
329
330 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
331 {
332 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
333
334 return q;
335 }
336
337 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
338 {
339 return qdisc->dev_queue->qdisc_sleeping;
340 }
341
342 /* The qdisc root lock is a mechanism by which to top level
343 * of a qdisc tree can be locked from any qdisc node in the
344 * forest. This allows changing the configuration of some
345 * aspect of the qdisc tree while blocking out asynchronous
346 * qdisc access in the packet processing paths.
347 *
348 * It is only legal to do this when the root will not change
349 * on us. Otherwise we'll potentially lock the wrong qdisc
350 * root. This is enforced by holding the RTNL semaphore, which
351 * all users of this lock accessor must do.
352 */
353 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
354 {
355 struct Qdisc *root = qdisc_root(qdisc);
356
357 ASSERT_RTNL();
358 return qdisc_lock(root);
359 }
360
361 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
362 {
363 struct Qdisc *root = qdisc_root_sleeping(qdisc);
364
365 ASSERT_RTNL();
366 return qdisc_lock(root);
367 }
368
369 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
370 {
371 struct Qdisc *root = qdisc_root_sleeping(qdisc);
372
373 ASSERT_RTNL();
374 return &root->running;
375 }
376
377 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
378 {
379 return qdisc->dev_queue->dev;
380 }
381
382 static inline void sch_tree_lock(const struct Qdisc *q)
383 {
384 spin_lock_bh(qdisc_root_sleeping_lock(q));
385 }
386
387 static inline void sch_tree_unlock(const struct Qdisc *q)
388 {
389 spin_unlock_bh(qdisc_root_sleeping_lock(q));
390 }
391
392 extern struct Qdisc noop_qdisc;
393 extern struct Qdisc_ops noop_qdisc_ops;
394 extern struct Qdisc_ops pfifo_fast_ops;
395 extern struct Qdisc_ops mq_qdisc_ops;
396 extern struct Qdisc_ops noqueue_qdisc_ops;
397 extern const struct Qdisc_ops *default_qdisc_ops;
398 static inline const struct Qdisc_ops *
399 get_default_qdisc_ops(const struct net_device *dev, int ntx)
400 {
401 return ntx < dev->real_num_tx_queues ?
402 default_qdisc_ops : &pfifo_fast_ops;
403 }
404
405 struct Qdisc_class_common {
406 u32 classid;
407 struct hlist_node hnode;
408 };
409
410 struct Qdisc_class_hash {
411 struct hlist_head *hash;
412 unsigned int hashsize;
413 unsigned int hashmask;
414 unsigned int hashelems;
415 };
416
417 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
418 {
419 id ^= id >> 8;
420 id ^= id >> 4;
421 return id & mask;
422 }
423
424 static inline struct Qdisc_class_common *
425 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
426 {
427 struct Qdisc_class_common *cl;
428 unsigned int h;
429
430 if (!id)
431 return NULL;
432
433 h = qdisc_class_hash(id, hash->hashmask);
434 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
435 if (cl->classid == id)
436 return cl;
437 }
438 return NULL;
439 }
440
441 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
442 {
443 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
444
445 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
446 }
447
448 int qdisc_class_hash_init(struct Qdisc_class_hash *);
449 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
450 struct Qdisc_class_common *);
451 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
452 struct Qdisc_class_common *);
453 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
454 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
455
456 void dev_init_scheduler(struct net_device *dev);
457 void dev_shutdown(struct net_device *dev);
458 void dev_activate(struct net_device *dev);
459 void dev_deactivate(struct net_device *dev);
460 void dev_deactivate_many(struct list_head *head);
461 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
462 struct Qdisc *qdisc);
463 void qdisc_reset(struct Qdisc *qdisc);
464 void qdisc_destroy(struct Qdisc *qdisc);
465 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
466 unsigned int len);
467 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
468 const struct Qdisc_ops *ops);
469 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
470 const struct Qdisc_ops *ops, u32 parentid);
471 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
472 const struct qdisc_size_table *stab);
473 int skb_do_redirect(struct sk_buff *);
474
475 static inline void skb_reset_tc(struct sk_buff *skb)
476 {
477 #ifdef CONFIG_NET_CLS_ACT
478 skb->tc_redirected = 0;
479 #endif
480 }
481
482 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
483 {
484 #ifdef CONFIG_NET_CLS_ACT
485 return skb->tc_at_ingress;
486 #else
487 return false;
488 #endif
489 }
490
491 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
492 {
493 #ifdef CONFIG_NET_CLS_ACT
494 if (skb->tc_skip_classify) {
495 skb->tc_skip_classify = 0;
496 return true;
497 }
498 #endif
499 return false;
500 }
501
502 /* Reset all TX qdiscs greater then index of a device. */
503 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
504 {
505 struct Qdisc *qdisc;
506
507 for (; i < dev->num_tx_queues; i++) {
508 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
509 if (qdisc) {
510 spin_lock_bh(qdisc_lock(qdisc));
511 qdisc_reset(qdisc);
512 spin_unlock_bh(qdisc_lock(qdisc));
513 }
514 }
515 }
516
517 static inline void qdisc_reset_all_tx(struct net_device *dev)
518 {
519 qdisc_reset_all_tx_gt(dev, 0);
520 }
521
522 /* Are all TX queues of the device empty? */
523 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
524 {
525 unsigned int i;
526
527 rcu_read_lock();
528 for (i = 0; i < dev->num_tx_queues; i++) {
529 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
530 const struct Qdisc *q = rcu_dereference(txq->qdisc);
531
532 if (q->q.qlen) {
533 rcu_read_unlock();
534 return false;
535 }
536 }
537 rcu_read_unlock();
538 return true;
539 }
540
541 /* Are any of the TX qdiscs changing? */
542 static inline bool qdisc_tx_changing(const struct net_device *dev)
543 {
544 unsigned int i;
545
546 for (i = 0; i < dev->num_tx_queues; i++) {
547 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
548 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
549 return true;
550 }
551 return false;
552 }
553
554 /* Is the device using the noop qdisc on all queues? */
555 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
556 {
557 unsigned int i;
558
559 for (i = 0; i < dev->num_tx_queues; i++) {
560 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
561 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
562 return false;
563 }
564 return true;
565 }
566
567 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
568 {
569 return qdisc_skb_cb(skb)->pkt_len;
570 }
571
572 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
573 enum net_xmit_qdisc_t {
574 __NET_XMIT_STOLEN = 0x00010000,
575 __NET_XMIT_BYPASS = 0x00020000,
576 };
577
578 #ifdef CONFIG_NET_CLS_ACT
579 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
580 #else
581 #define net_xmit_drop_count(e) (1)
582 #endif
583
584 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
585 const struct Qdisc *sch)
586 {
587 #ifdef CONFIG_NET_SCHED
588 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
589
590 if (stab)
591 __qdisc_calculate_pkt_len(skb, stab);
592 #endif
593 }
594
595 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
596 struct sk_buff **to_free)
597 {
598 qdisc_calculate_pkt_len(skb, sch);
599 return sch->enqueue(skb, sch, to_free);
600 }
601
602 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
603 {
604 return q->flags & TCQ_F_CPUSTATS;
605 }
606
607 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
608 __u64 bytes, __u32 packets)
609 {
610 bstats->bytes += bytes;
611 bstats->packets += packets;
612 }
613
614 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
615 const struct sk_buff *skb)
616 {
617 _bstats_update(bstats,
618 qdisc_pkt_len(skb),
619 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
620 }
621
622 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
623 __u64 bytes, __u32 packets)
624 {
625 u64_stats_update_begin(&bstats->syncp);
626 _bstats_update(&bstats->bstats, bytes, packets);
627 u64_stats_update_end(&bstats->syncp);
628 }
629
630 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
631 const struct sk_buff *skb)
632 {
633 u64_stats_update_begin(&bstats->syncp);
634 bstats_update(&bstats->bstats, skb);
635 u64_stats_update_end(&bstats->syncp);
636 }
637
638 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
639 const struct sk_buff *skb)
640 {
641 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
642 }
643
644 static inline void qdisc_bstats_update(struct Qdisc *sch,
645 const struct sk_buff *skb)
646 {
647 bstats_update(&sch->bstats, skb);
648 }
649
650 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
651 const struct sk_buff *skb)
652 {
653 sch->qstats.backlog -= qdisc_pkt_len(skb);
654 }
655
656 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
657 const struct sk_buff *skb)
658 {
659 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
660 }
661
662 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
663 const struct sk_buff *skb)
664 {
665 sch->qstats.backlog += qdisc_pkt_len(skb);
666 }
667
668 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
669 const struct sk_buff *skb)
670 {
671 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
672 }
673
674 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
675 {
676 this_cpu_inc(sch->cpu_qstats->qlen);
677 }
678
679 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
680 {
681 this_cpu_dec(sch->cpu_qstats->qlen);
682 }
683
684 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
685 {
686 this_cpu_inc(sch->cpu_qstats->requeues);
687 }
688
689 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
690 {
691 sch->qstats.drops += count;
692 }
693
694 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
695 {
696 qstats->drops++;
697 }
698
699 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
700 {
701 qstats->overlimits++;
702 }
703
704 static inline void qdisc_qstats_drop(struct Qdisc *sch)
705 {
706 qstats_drop_inc(&sch->qstats);
707 }
708
709 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
710 {
711 this_cpu_inc(sch->cpu_qstats->drops);
712 }
713
714 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
715 {
716 sch->qstats.overlimits++;
717 }
718
719 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
720 {
721 qh->head = NULL;
722 qh->tail = NULL;
723 qh->qlen = 0;
724 }
725
726 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
727 struct qdisc_skb_head *qh)
728 {
729 struct sk_buff *last = qh->tail;
730
731 if (last) {
732 skb->next = NULL;
733 last->next = skb;
734 qh->tail = skb;
735 } else {
736 qh->tail = skb;
737 qh->head = skb;
738 }
739 qh->qlen++;
740 qdisc_qstats_backlog_inc(sch, skb);
741
742 return NET_XMIT_SUCCESS;
743 }
744
745 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
746 {
747 return __qdisc_enqueue_tail(skb, sch, &sch->q);
748 }
749
750 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
751 {
752 struct sk_buff *skb = qh->head;
753
754 if (likely(skb != NULL)) {
755 qh->head = skb->next;
756 qh->qlen--;
757 if (qh->head == NULL)
758 qh->tail = NULL;
759 skb->next = NULL;
760 }
761
762 return skb;
763 }
764
765 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
766 {
767 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
768
769 if (likely(skb != NULL)) {
770 qdisc_qstats_backlog_dec(sch, skb);
771 qdisc_bstats_update(sch, skb);
772 }
773
774 return skb;
775 }
776
777 /* Instead of calling kfree_skb() while root qdisc lock is held,
778 * queue the skb for future freeing at end of __dev_xmit_skb()
779 */
780 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
781 {
782 skb->next = *to_free;
783 *to_free = skb;
784 }
785
786 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
787 struct qdisc_skb_head *qh,
788 struct sk_buff **to_free)
789 {
790 struct sk_buff *skb = __qdisc_dequeue_head(qh);
791
792 if (likely(skb != NULL)) {
793 unsigned int len = qdisc_pkt_len(skb);
794
795 qdisc_qstats_backlog_dec(sch, skb);
796 __qdisc_drop(skb, to_free);
797 return len;
798 }
799
800 return 0;
801 }
802
803 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
804 struct sk_buff **to_free)
805 {
806 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
807 }
808
809 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
810 {
811 const struct qdisc_skb_head *qh = &sch->q;
812
813 return qh->head;
814 }
815
816 /* generic pseudo peek method for non-work-conserving qdisc */
817 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
818 {
819 struct sk_buff *skb = skb_peek(&sch->gso_skb);
820
821 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
822 if (!skb) {
823 skb = sch->dequeue(sch);
824
825 if (skb) {
826 __skb_queue_head(&sch->gso_skb, skb);
827 /* it's still part of the queue */
828 qdisc_qstats_backlog_inc(sch, skb);
829 sch->q.qlen++;
830 }
831 }
832
833 return skb;
834 }
835
836 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
837 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
838 {
839 struct sk_buff *skb = skb_peek(&sch->gso_skb);
840
841 if (skb) {
842 skb = __skb_dequeue(&sch->gso_skb);
843 qdisc_qstats_backlog_dec(sch, skb);
844 sch->q.qlen--;
845 } else {
846 skb = sch->dequeue(sch);
847 }
848
849 return skb;
850 }
851
852 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
853 {
854 /*
855 * We do not know the backlog in bytes of this list, it
856 * is up to the caller to correct it
857 */
858 ASSERT_RTNL();
859 if (qh->qlen) {
860 rtnl_kfree_skbs(qh->head, qh->tail);
861
862 qh->head = NULL;
863 qh->tail = NULL;
864 qh->qlen = 0;
865 }
866 }
867
868 static inline void qdisc_reset_queue(struct Qdisc *sch)
869 {
870 __qdisc_reset_queue(&sch->q);
871 sch->qstats.backlog = 0;
872 }
873
874 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
875 struct Qdisc **pold)
876 {
877 struct Qdisc *old;
878
879 sch_tree_lock(sch);
880 old = *pold;
881 *pold = new;
882 if (old != NULL) {
883 unsigned int qlen = old->q.qlen;
884 unsigned int backlog = old->qstats.backlog;
885
886 qdisc_reset(old);
887 qdisc_tree_reduce_backlog(old, qlen, backlog);
888 }
889 sch_tree_unlock(sch);
890
891 return old;
892 }
893
894 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
895 {
896 rtnl_kfree_skbs(skb, skb);
897 qdisc_qstats_drop(sch);
898 }
899
900 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
901 struct sk_buff **to_free)
902 {
903 __qdisc_drop(skb, to_free);
904 qdisc_qstats_cpu_drop(sch);
905
906 return NET_XMIT_DROP;
907 }
908
909 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
910 struct sk_buff **to_free)
911 {
912 __qdisc_drop(skb, to_free);
913 qdisc_qstats_drop(sch);
914
915 return NET_XMIT_DROP;
916 }
917
918 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
919 long it will take to send a packet given its size.
920 */
921 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
922 {
923 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
924 if (slot < 0)
925 slot = 0;
926 slot >>= rtab->rate.cell_log;
927 if (slot > 255)
928 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
929 return rtab->data[slot];
930 }
931
932 struct psched_ratecfg {
933 u64 rate_bytes_ps; /* bytes per second */
934 u32 mult;
935 u16 overhead;
936 u8 linklayer;
937 u8 shift;
938 };
939
940 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
941 unsigned int len)
942 {
943 len += r->overhead;
944
945 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
946 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
947
948 return ((u64)len * r->mult) >> r->shift;
949 }
950
951 void psched_ratecfg_precompute(struct psched_ratecfg *r,
952 const struct tc_ratespec *conf,
953 u64 rate64);
954
955 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
956 const struct psched_ratecfg *r)
957 {
958 memset(res, 0, sizeof(*res));
959
960 /* legacy struct tc_ratespec has a 32bit @rate field
961 * Qdisc using 64bit rate should add new attributes
962 * in order to maintain compatibility.
963 */
964 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
965
966 res->overhead = r->overhead;
967 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
968 }
969
970 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
971 * The fast path only needs to access filter list and to update stats
972 */
973 struct mini_Qdisc {
974 struct tcf_proto *filter_list;
975 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
976 struct gnet_stats_queue __percpu *cpu_qstats;
977 struct rcu_head rcu;
978 };
979
980 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
981 const struct sk_buff *skb)
982 {
983 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
984 }
985
986 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
987 {
988 this_cpu_inc(miniq->cpu_qstats->drops);
989 }
990
991 struct mini_Qdisc_pair {
992 struct mini_Qdisc miniq1;
993 struct mini_Qdisc miniq2;
994 struct mini_Qdisc __rcu **p_miniq;
995 };
996
997 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
998 struct tcf_proto *tp_head);
999 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1000 struct mini_Qdisc __rcu **p_miniq);
1001
1002 #endif
Ubuntu Jammy Linux kernel mirror