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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / include / net / sch_generic.h
blobe2ab13687fb9741f3977b5452a958f8e886189f4
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 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
76 u32 limit;
77 const struct Qdisc_ops *ops;
78 struct qdisc_size_table __rcu *stab;
79 struct hlist_node hash;
80 u32 handle;
81 u32 parent;
82
83 struct netdev_queue *dev_queue;
84
85 struct net_rate_estimator __rcu *rate_est;
86 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
87 struct gnet_stats_queue __percpu *cpu_qstats;
88
89 /*
90 * For performance sake on SMP, we put highly modified fields at the end
91 */
92 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
93 struct qdisc_skb_head q;
94 struct gnet_stats_basic_packed bstats;
95 seqcount_t running;
96 struct gnet_stats_queue qstats;
97 unsigned long state;
98 struct Qdisc *next_sched;
99 struct sk_buff_head skb_bad_txq;
100 int padded;
101 refcount_t refcnt;
102
103 spinlock_t busylock ____cacheline_aligned_in_smp;
104 };
105
106 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
107 {
108 if (qdisc->flags & TCQ_F_BUILTIN)
109 return;
110 refcount_inc(&qdisc->refcnt);
111 }
112
113 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
114 {
115 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
116 }
117
118 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
119 {
120 if (qdisc_is_running(qdisc))
121 return false;
122 /* Variant of write_seqcount_begin() telling lockdep a trylock
123 * was attempted.
124 */
125 raw_write_seqcount_begin(&qdisc->running);
126 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
127 return true;
128 }
129
130 static inline void qdisc_run_end(struct Qdisc *qdisc)
131 {
132 write_seqcount_end(&qdisc->running);
133 }
134
135 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
136 {
137 return qdisc->flags & TCQ_F_ONETXQUEUE;
138 }
139
140 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
141 {
142 #ifdef CONFIG_BQL
143 /* Non-BQL migrated drivers will return 0, too. */
144 return dql_avail(&txq->dql);
145 #else
146 return 0;
147 #endif
148 }
149
150 struct Qdisc_class_ops {
151 /* Child qdisc manipulation */
152 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
153 int (*graft)(struct Qdisc *, unsigned long cl,
154 struct Qdisc *, struct Qdisc **,
155 struct netlink_ext_ack *extack);
156 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
157 void (*qlen_notify)(struct Qdisc *, unsigned long);
158
159 /* Class manipulation routines */
160 unsigned long (*find)(struct Qdisc *, u32 classid);
161 int (*change)(struct Qdisc *, u32, u32,
162 struct nlattr **, unsigned long *,
163 struct netlink_ext_ack *);
164 int (*delete)(struct Qdisc *, unsigned long);
165 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
166
167 /* Filter manipulation */
168 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
169 unsigned long arg,
170 struct netlink_ext_ack *extack);
171 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
172 u32 classid);
173 void (*unbind_tcf)(struct Qdisc *, unsigned long);
174
175 /* rtnetlink specific */
176 int (*dump)(struct Qdisc *, unsigned long,
177 struct sk_buff *skb, struct tcmsg*);
178 int (*dump_stats)(struct Qdisc *, unsigned long,
179 struct gnet_dump *);
180 };
181
182 struct Qdisc_ops {
183 struct Qdisc_ops *next;
184 const struct Qdisc_class_ops *cl_ops;
185 char id[IFNAMSIZ];
186 int priv_size;
187 unsigned int static_flags;
188
189 int (*enqueue)(struct sk_buff *skb,
190 struct Qdisc *sch,
191 struct sk_buff **to_free);
192 struct sk_buff * (*dequeue)(struct Qdisc *);
193 struct sk_buff * (*peek)(struct Qdisc *);
194
195 int (*init)(struct Qdisc *sch, struct nlattr *arg,
196 struct netlink_ext_ack *extack);
197 void (*reset)(struct Qdisc *);
198 void (*destroy)(struct Qdisc *);
199 int (*change)(struct Qdisc *sch,
200 struct nlattr *arg,
201 struct netlink_ext_ack *extack);
202 void (*attach)(struct Qdisc *sch);
203 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
204
205 int (*dump)(struct Qdisc *, struct sk_buff *);
206 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
207
208 void (*ingress_block_set)(struct Qdisc *sch,
209 u32 block_index);
210 void (*egress_block_set)(struct Qdisc *sch,
211 u32 block_index);
212 u32 (*ingress_block_get)(struct Qdisc *sch);
213 u32 (*egress_block_get)(struct Qdisc *sch);
214
215 struct module *owner;
216 };
217
218
219 struct tcf_result {
220 union {
221 struct {
222 unsigned long class;
223 u32 classid;
224 };
225 const struct tcf_proto *goto_tp;
226 };
227 };
228
229 struct tcf_proto_ops {
230 struct list_head head;
231 char kind[IFNAMSIZ];
232
233 int (*classify)(struct sk_buff *,
234 const struct tcf_proto *,
235 struct tcf_result *);
236 int (*init)(struct tcf_proto*);
237 void (*destroy)(struct tcf_proto *tp,
238 struct netlink_ext_ack *extack);
239
240 void* (*get)(struct tcf_proto*, u32 handle);
241 int (*change)(struct net *net, struct sk_buff *,
242 struct tcf_proto*, unsigned long,
243 u32 handle, struct nlattr **,
244 void **, bool,
245 struct netlink_ext_ack *);
246 int (*delete)(struct tcf_proto *tp, void *arg,
247 bool *last,
248 struct netlink_ext_ack *);
249 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
250 void (*bind_class)(void *, u32, unsigned long);
251
252 /* rtnetlink specific */
253 int (*dump)(struct net*, struct tcf_proto*, void *,
254 struct sk_buff *skb, struct tcmsg*);
255
256 struct module *owner;
257 };
258
259 struct tcf_proto {
260 /* Fast access part */
261 struct tcf_proto __rcu *next;
262 void __rcu *root;
263 int (*classify)(struct sk_buff *,
264 const struct tcf_proto *,
265 struct tcf_result *);
266 __be16 protocol;
267
268 /* All the rest */
269 u32 prio;
270 void *data;
271 const struct tcf_proto_ops *ops;
272 struct tcf_chain *chain;
273 struct rcu_head rcu;
274 };
275
276 struct qdisc_skb_cb {
277 unsigned int pkt_len;
278 u16 slave_dev_queue_mapping;
279 u16 tc_classid;
280 #define QDISC_CB_PRIV_LEN 20
281 unsigned char data[QDISC_CB_PRIV_LEN];
282 };
283
284 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
285
286 struct tcf_chain {
287 struct tcf_proto __rcu *filter_chain;
288 struct list_head filter_chain_list;
289 struct list_head list;
290 struct tcf_block *block;
291 u32 index; /* chain index */
292 unsigned int refcnt;
293 };
294
295 struct tcf_block {
296 struct list_head chain_list;
297 u32 index; /* block index for shared blocks */
298 unsigned int refcnt;
299 struct net *net;
300 struct Qdisc *q;
301 struct list_head cb_list;
302 struct list_head owner_list;
303 bool keep_dst;
304 unsigned int offloadcnt; /* Number of oddloaded filters */
305 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
306 };
307
308 static inline void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
309 {
310 if (*flags & TCA_CLS_FLAGS_IN_HW)
311 return;
312 *flags |= TCA_CLS_FLAGS_IN_HW;
313 block->offloadcnt++;
314 }
315
316 static inline void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
317 {
318 if (!(*flags & TCA_CLS_FLAGS_IN_HW))
319 return;
320 *flags &= ~TCA_CLS_FLAGS_IN_HW;
321 block->offloadcnt--;
322 }
323
324 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
325 {
326 struct qdisc_skb_cb *qcb;
327
328 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
329 BUILD_BUG_ON(sizeof(qcb->data) < sz);
330 }
331
332 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
333 {
334 return this_cpu_ptr(q->cpu_qstats)->qlen;
335 }
336
337 static inline int qdisc_qlen(const struct Qdisc *q)
338 {
339 return q->q.qlen;
340 }
341
342 static inline int qdisc_qlen_sum(const struct Qdisc *q)
343 {
344 __u32 qlen = 0;
345 int i;
346
347 if (q->flags & TCQ_F_NOLOCK) {
348 for_each_possible_cpu(i)
349 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
350 } else {
351 qlen = q->q.qlen;
352 }
353
354 return qlen;
355 }
356
357 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
358 {
359 return (struct qdisc_skb_cb *)skb->cb;
360 }
361
362 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
363 {
364 return &qdisc->q.lock;
365 }
366
367 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
368 {
369 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
370
371 return q;
372 }
373
374 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
375 {
376 return qdisc->dev_queue->qdisc_sleeping;
377 }
378
379 /* The qdisc root lock is a mechanism by which to top level
380 * of a qdisc tree can be locked from any qdisc node in the
381 * forest. This allows changing the configuration of some
382 * aspect of the qdisc tree while blocking out asynchronous
383 * qdisc access in the packet processing paths.
384 *
385 * It is only legal to do this when the root will not change
386 * on us. Otherwise we'll potentially lock the wrong qdisc
387 * root. This is enforced by holding the RTNL semaphore, which
388 * all users of this lock accessor must do.
389 */
390 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
391 {
392 struct Qdisc *root = qdisc_root(qdisc);
393
394 ASSERT_RTNL();
395 return qdisc_lock(root);
396 }
397
398 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
399 {
400 struct Qdisc *root = qdisc_root_sleeping(qdisc);
401
402 ASSERT_RTNL();
403 return qdisc_lock(root);
404 }
405
406 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
407 {
408 struct Qdisc *root = qdisc_root_sleeping(qdisc);
409
410 ASSERT_RTNL();
411 return &root->running;
412 }
413
414 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
415 {
416 return qdisc->dev_queue->dev;
417 }
418
419 static inline void sch_tree_lock(const struct Qdisc *q)
420 {
421 spin_lock_bh(qdisc_root_sleeping_lock(q));
422 }
423
424 static inline void sch_tree_unlock(const struct Qdisc *q)
425 {
426 spin_unlock_bh(qdisc_root_sleeping_lock(q));
427 }
428
429 extern struct Qdisc noop_qdisc;
430 extern struct Qdisc_ops noop_qdisc_ops;
431 extern struct Qdisc_ops pfifo_fast_ops;
432 extern struct Qdisc_ops mq_qdisc_ops;
433 extern struct Qdisc_ops noqueue_qdisc_ops;
434 extern const struct Qdisc_ops *default_qdisc_ops;
435 static inline const struct Qdisc_ops *
436 get_default_qdisc_ops(const struct net_device *dev, int ntx)
437 {
438 return ntx < dev->real_num_tx_queues ?
439 default_qdisc_ops : &pfifo_fast_ops;
440 }
441
442 struct Qdisc_class_common {
443 u32 classid;
444 struct hlist_node hnode;
445 };
446
447 struct Qdisc_class_hash {
448 struct hlist_head *hash;
449 unsigned int hashsize;
450 unsigned int hashmask;
451 unsigned int hashelems;
452 };
453
454 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
455 {
456 id ^= id >> 8;
457 id ^= id >> 4;
458 return id & mask;
459 }
460
461 static inline struct Qdisc_class_common *
462 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
463 {
464 struct Qdisc_class_common *cl;
465 unsigned int h;
466
467 if (!id)
468 return NULL;
469
470 h = qdisc_class_hash(id, hash->hashmask);
471 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
472 if (cl->classid == id)
473 return cl;
474 }
475 return NULL;
476 }
477
478 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
479 {
480 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
481
482 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
483 }
484
485 int qdisc_class_hash_init(struct Qdisc_class_hash *);
486 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
487 struct Qdisc_class_common *);
488 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
489 struct Qdisc_class_common *);
490 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
491 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
492
493 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
494 void dev_init_scheduler(struct net_device *dev);
495 void dev_shutdown(struct net_device *dev);
496 void dev_activate(struct net_device *dev);
497 void dev_deactivate(struct net_device *dev);
498 void dev_deactivate_many(struct list_head *head);
499 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
500 struct Qdisc *qdisc);
501 void qdisc_reset(struct Qdisc *qdisc);
502 void qdisc_destroy(struct Qdisc *qdisc);
503 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
504 unsigned int len);
505 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
506 const struct Qdisc_ops *ops,
507 struct netlink_ext_ack *extack);
508 void qdisc_free(struct Qdisc *qdisc);
509 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
510 const struct Qdisc_ops *ops, u32 parentid,
511 struct netlink_ext_ack *extack);
512 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
513 const struct qdisc_size_table *stab);
514 int skb_do_redirect(struct sk_buff *);
515
516 static inline void skb_reset_tc(struct sk_buff *skb)
517 {
518 #ifdef CONFIG_NET_CLS_ACT
519 skb->tc_redirected = 0;
520 #endif
521 }
522
523 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
524 {
525 #ifdef CONFIG_NET_CLS_ACT
526 return skb->tc_at_ingress;
527 #else
528 return false;
529 #endif
530 }
531
532 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
533 {
534 #ifdef CONFIG_NET_CLS_ACT
535 if (skb->tc_skip_classify) {
536 skb->tc_skip_classify = 0;
537 return true;
538 }
539 #endif
540 return false;
541 }
542
543 /* Reset all TX qdiscs greater then index of a device. */
544 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
545 {
546 struct Qdisc *qdisc;
547
548 for (; i < dev->num_tx_queues; i++) {
549 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
550 if (qdisc) {
551 spin_lock_bh(qdisc_lock(qdisc));
552 qdisc_reset(qdisc);
553 spin_unlock_bh(qdisc_lock(qdisc));
554 }
555 }
556 }
557
558 static inline void qdisc_reset_all_tx(struct net_device *dev)
559 {
560 qdisc_reset_all_tx_gt(dev, 0);
561 }
562
563 /* Are all TX queues of the device empty? */
564 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
565 {
566 unsigned int i;
567
568 rcu_read_lock();
569 for (i = 0; i < dev->num_tx_queues; i++) {
570 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
571 const struct Qdisc *q = rcu_dereference(txq->qdisc);
572
573 if (q->q.qlen) {
574 rcu_read_unlock();
575 return false;
576 }
577 }
578 rcu_read_unlock();
579 return true;
580 }
581
582 /* Are any of the TX qdiscs changing? */
583 static inline bool qdisc_tx_changing(const struct net_device *dev)
584 {
585 unsigned int i;
586
587 for (i = 0; i < dev->num_tx_queues; i++) {
588 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
589 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
590 return true;
591 }
592 return false;
593 }
594
595 /* Is the device using the noop qdisc on all queues? */
596 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
597 {
598 unsigned int i;
599
600 for (i = 0; i < dev->num_tx_queues; i++) {
601 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
602 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
603 return false;
604 }
605 return true;
606 }
607
608 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
609 {
610 return qdisc_skb_cb(skb)->pkt_len;
611 }
612
613 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
614 enum net_xmit_qdisc_t {
615 __NET_XMIT_STOLEN = 0x00010000,
616 __NET_XMIT_BYPASS = 0x00020000,
617 };
618
619 #ifdef CONFIG_NET_CLS_ACT
620 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
621 #else
622 #define net_xmit_drop_count(e) (1)
623 #endif
624
625 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
626 const struct Qdisc *sch)
627 {
628 #ifdef CONFIG_NET_SCHED
629 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
630
631 if (stab)
632 __qdisc_calculate_pkt_len(skb, stab);
633 #endif
634 }
635
636 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
637 struct sk_buff **to_free)
638 {
639 qdisc_calculate_pkt_len(skb, sch);
640 return sch->enqueue(skb, sch, to_free);
641 }
642
643 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
644 {
645 return q->flags & TCQ_F_CPUSTATS;
646 }
647
648 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
649 __u64 bytes, __u32 packets)
650 {
651 bstats->bytes += bytes;
652 bstats->packets += packets;
653 }
654
655 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
656 const struct sk_buff *skb)
657 {
658 _bstats_update(bstats,
659 qdisc_pkt_len(skb),
660 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
661 }
662
663 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
664 __u64 bytes, __u32 packets)
665 {
666 u64_stats_update_begin(&bstats->syncp);
667 _bstats_update(&bstats->bstats, bytes, packets);
668 u64_stats_update_end(&bstats->syncp);
669 }
670
671 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
672 const struct sk_buff *skb)
673 {
674 u64_stats_update_begin(&bstats->syncp);
675 bstats_update(&bstats->bstats, skb);
676 u64_stats_update_end(&bstats->syncp);
677 }
678
679 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
680 const struct sk_buff *skb)
681 {
682 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
683 }
684
685 static inline void qdisc_bstats_update(struct Qdisc *sch,
686 const struct sk_buff *skb)
687 {
688 bstats_update(&sch->bstats, skb);
689 }
690
691 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
692 const struct sk_buff *skb)
693 {
694 sch->qstats.backlog -= qdisc_pkt_len(skb);
695 }
696
697 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
698 const struct sk_buff *skb)
699 {
700 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
701 }
702
703 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
704 const struct sk_buff *skb)
705 {
706 sch->qstats.backlog += qdisc_pkt_len(skb);
707 }
708
709 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
710 const struct sk_buff *skb)
711 {
712 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
713 }
714
715 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
716 {
717 this_cpu_inc(sch->cpu_qstats->qlen);
718 }
719
720 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
721 {
722 this_cpu_dec(sch->cpu_qstats->qlen);
723 }
724
725 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
726 {
727 this_cpu_inc(sch->cpu_qstats->requeues);
728 }
729
730 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
731 {
732 sch->qstats.drops += count;
733 }
734
735 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
736 {
737 qstats->drops++;
738 }
739
740 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
741 {
742 qstats->overlimits++;
743 }
744
745 static inline void qdisc_qstats_drop(struct Qdisc *sch)
746 {
747 qstats_drop_inc(&sch->qstats);
748 }
749
750 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
751 {
752 this_cpu_inc(sch->cpu_qstats->drops);
753 }
754
755 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
756 {
757 sch->qstats.overlimits++;
758 }
759
760 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
761 {
762 qh->head = NULL;
763 qh->tail = NULL;
764 qh->qlen = 0;
765 }
766
767 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
768 struct qdisc_skb_head *qh)
769 {
770 struct sk_buff *last = qh->tail;
771
772 if (last) {
773 skb->next = NULL;
774 last->next = skb;
775 qh->tail = skb;
776 } else {
777 qh->tail = skb;
778 qh->head = skb;
779 }
780 qh->qlen++;
781 qdisc_qstats_backlog_inc(sch, skb);
782
783 return NET_XMIT_SUCCESS;
784 }
785
786 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
787 {
788 return __qdisc_enqueue_tail(skb, sch, &sch->q);
789 }
790
791 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
792 {
793 struct sk_buff *skb = qh->head;
794
795 if (likely(skb != NULL)) {
796 qh->head = skb->next;
797 qh->qlen--;
798 if (qh->head == NULL)
799 qh->tail = NULL;
800 skb->next = NULL;
801 }
802
803 return skb;
804 }
805
806 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
807 {
808 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
809
810 if (likely(skb != NULL)) {
811 qdisc_qstats_backlog_dec(sch, skb);
812 qdisc_bstats_update(sch, skb);
813 }
814
815 return skb;
816 }
817
818 /* Instead of calling kfree_skb() while root qdisc lock is held,
819 * queue the skb for future freeing at end of __dev_xmit_skb()
820 */
821 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
822 {
823 skb->next = *to_free;
824 *to_free = skb;
825 }
826
827 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
828 struct qdisc_skb_head *qh,
829 struct sk_buff **to_free)
830 {
831 struct sk_buff *skb = __qdisc_dequeue_head(qh);
832
833 if (likely(skb != NULL)) {
834 unsigned int len = qdisc_pkt_len(skb);
835
836 qdisc_qstats_backlog_dec(sch, skb);
837 __qdisc_drop(skb, to_free);
838 return len;
839 }
840
841 return 0;
842 }
843
844 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
845 struct sk_buff **to_free)
846 {
847 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
848 }
849
850 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
851 {
852 const struct qdisc_skb_head *qh = &sch->q;
853
854 return qh->head;
855 }
856
857 /* generic pseudo peek method for non-work-conserving qdisc */
858 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
859 {
860 struct sk_buff *skb = skb_peek(&sch->gso_skb);
861
862 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
863 if (!skb) {
864 skb = sch->dequeue(sch);
865
866 if (skb) {
867 __skb_queue_head(&sch->gso_skb, skb);
868 /* it's still part of the queue */
869 qdisc_qstats_backlog_inc(sch, skb);
870 sch->q.qlen++;
871 }
872 }
873
874 return skb;
875 }
876
877 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
878 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
879 {
880 struct sk_buff *skb = skb_peek(&sch->gso_skb);
881
882 if (skb) {
883 skb = __skb_dequeue(&sch->gso_skb);
884 qdisc_qstats_backlog_dec(sch, skb);
885 sch->q.qlen--;
886 } else {
887 skb = sch->dequeue(sch);
888 }
889
890 return skb;
891 }
892
893 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
894 {
895 /*
896 * We do not know the backlog in bytes of this list, it
897 * is up to the caller to correct it
898 */
899 ASSERT_RTNL();
900 if (qh->qlen) {
901 rtnl_kfree_skbs(qh->head, qh->tail);
902
903 qh->head = NULL;
904 qh->tail = NULL;
905 qh->qlen = 0;
906 }
907 }
908
909 static inline void qdisc_reset_queue(struct Qdisc *sch)
910 {
911 __qdisc_reset_queue(&sch->q);
912 sch->qstats.backlog = 0;
913 }
914
915 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
916 struct Qdisc **pold)
917 {
918 struct Qdisc *old;
919
920 sch_tree_lock(sch);
921 old = *pold;
922 *pold = new;
923 if (old != NULL) {
924 unsigned int qlen = old->q.qlen;
925 unsigned int backlog = old->qstats.backlog;
926
927 qdisc_reset(old);
928 qdisc_tree_reduce_backlog(old, qlen, backlog);
929 }
930 sch_tree_unlock(sch);
931
932 return old;
933 }
934
935 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
936 {
937 rtnl_kfree_skbs(skb, skb);
938 qdisc_qstats_drop(sch);
939 }
940
941 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
942 struct sk_buff **to_free)
943 {
944 __qdisc_drop(skb, to_free);
945 qdisc_qstats_cpu_drop(sch);
946
947 return NET_XMIT_DROP;
948 }
949
950 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
951 struct sk_buff **to_free)
952 {
953 __qdisc_drop(skb, to_free);
954 qdisc_qstats_drop(sch);
955
956 return NET_XMIT_DROP;
957 }
958
959 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
960 long it will take to send a packet given its size.
961 */
962 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
963 {
964 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
965 if (slot < 0)
966 slot = 0;
967 slot >>= rtab->rate.cell_log;
968 if (slot > 255)
969 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
970 return rtab->data[slot];
971 }
972
973 struct psched_ratecfg {
974 u64 rate_bytes_ps; /* bytes per second */
975 u32 mult;
976 u16 overhead;
977 u8 linklayer;
978 u8 shift;
979 };
980
981 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
982 unsigned int len)
983 {
984 len += r->overhead;
985
986 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
987 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
988
989 return ((u64)len * r->mult) >> r->shift;
990 }
991
992 void psched_ratecfg_precompute(struct psched_ratecfg *r,
993 const struct tc_ratespec *conf,
994 u64 rate64);
995
996 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
997 const struct psched_ratecfg *r)
998 {
999 memset(res, 0, sizeof(*res));
1000
1001 /* legacy struct tc_ratespec has a 32bit @rate field
1002 * Qdisc using 64bit rate should add new attributes
1003 * in order to maintain compatibility.
1004 */
1005 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1006
1007 res->overhead = r->overhead;
1008 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1009 }
1010
1011 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1012 * The fast path only needs to access filter list and to update stats
1013 */
1014 struct mini_Qdisc {
1015 struct tcf_proto *filter_list;
1016 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1017 struct gnet_stats_queue __percpu *cpu_qstats;
1018 struct rcu_head rcu;
1019 };
1020
1021 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1022 const struct sk_buff *skb)
1023 {
1024 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1025 }
1026
1027 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1028 {
1029 this_cpu_inc(miniq->cpu_qstats->drops);
1030 }
1031
1032 struct mini_Qdisc_pair {
1033 struct mini_Qdisc miniq1;
1034 struct mini_Qdisc miniq2;
1035 struct mini_Qdisc __rcu **p_miniq;
1036 };
1037
1038 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1039 struct tcf_proto *tp_head);
1040 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1041 struct mini_Qdisc __rcu **p_miniq);
1042
1043 #endif
Linux with added FPC-III support