?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 4.16.11
[linux/fpc-iii.git] / include / net / sch_generic.h
blob8da32678ce18e1003ea051870b2149a41c9daa44
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 __QDISC_STATE_RUNNING,
34 };
35
36 struct qdisc_size_table {
37 struct rcu_head rcu;
38 struct list_head list;
39 struct tc_sizespec szopts;
40 int refcnt;
41 u16 data[];
42 };
43
44 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
45 struct qdisc_skb_head {
46 struct sk_buff *head;
47 struct sk_buff *tail;
48 __u32 qlen;
49 spinlock_t lock;
50 };
51
52 struct Qdisc {
53 int (*enqueue)(struct sk_buff *skb,
54 struct Qdisc *sch,
55 struct sk_buff **to_free);
56 struct sk_buff * (*dequeue)(struct Qdisc *sch);
57 unsigned int flags;
58 #define TCQ_F_BUILTIN 1
59 #define TCQ_F_INGRESS 2
60 #define TCQ_F_CAN_BYPASS 4
61 #define TCQ_F_MQROOT 8
62 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
63 * q->dev_queue : It can test
64 * netif_xmit_frozen_or_stopped() before
65 * dequeueing next packet.
66 * Its true for MQ/MQPRIO slaves, or non
67 * multiqueue device.
68 */
69 #define TCQ_F_WARN_NONWC (1 << 16)
70 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
71 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
72 * qdisc_tree_decrease_qlen() should stop.
73 */
74 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
75 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
76 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
77 u32 limit;
78 const struct Qdisc_ops *ops;
79 struct qdisc_size_table __rcu *stab;
80 struct hlist_node hash;
81 u32 handle;
82 u32 parent;
83
84 struct netdev_queue *dev_queue;
85
86 struct net_rate_estimator __rcu *rate_est;
87 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
88 struct gnet_stats_queue __percpu *cpu_qstats;
89
90 /*
91 * For performance sake on SMP, we put highly modified fields at the end
92 */
93 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
94 struct qdisc_skb_head q;
95 struct gnet_stats_basic_packed bstats;
96 seqcount_t running;
97 struct gnet_stats_queue qstats;
98 unsigned long state;
99 struct Qdisc *next_sched;
100 struct sk_buff_head skb_bad_txq;
101 int padded;
102 refcount_t refcnt;
103
104 spinlock_t busylock ____cacheline_aligned_in_smp;
105 };
106
107 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
108 {
109 if (qdisc->flags & TCQ_F_BUILTIN)
110 return;
111 refcount_inc(&qdisc->refcnt);
112 }
113
114 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
115 {
116 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
117 }
118
119 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
120 {
121 if (qdisc_is_running(qdisc))
122 return false;
123 /* Variant of write_seqcount_begin() telling lockdep a trylock
124 * was attempted.
125 */
126 raw_write_seqcount_begin(&qdisc->running);
127 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
128 return true;
129 }
130
131 static inline void qdisc_run_end(struct Qdisc *qdisc)
132 {
133 write_seqcount_end(&qdisc->running);
134 }
135
136 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
137 {
138 return qdisc->flags & TCQ_F_ONETXQUEUE;
139 }
140
141 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
142 {
143 #ifdef CONFIG_BQL
144 /* Non-BQL migrated drivers will return 0, too. */
145 return dql_avail(&txq->dql);
146 #else
147 return 0;
148 #endif
149 }
150
151 struct Qdisc_class_ops {
152 /* Child qdisc manipulation */
153 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
154 int (*graft)(struct Qdisc *, unsigned long cl,
155 struct Qdisc *, struct Qdisc **,
156 struct netlink_ext_ack *extack);
157 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
158 void (*qlen_notify)(struct Qdisc *, unsigned long);
159
160 /* Class manipulation routines */
161 unsigned long (*find)(struct Qdisc *, u32 classid);
162 int (*change)(struct Qdisc *, u32, u32,
163 struct nlattr **, unsigned long *,
164 struct netlink_ext_ack *);
165 int (*delete)(struct Qdisc *, unsigned long);
166 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
167
168 /* Filter manipulation */
169 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
170 unsigned long arg,
171 struct netlink_ext_ack *extack);
172 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
173 u32 classid);
174 void (*unbind_tcf)(struct Qdisc *, unsigned long);
175
176 /* rtnetlink specific */
177 int (*dump)(struct Qdisc *, unsigned long,
178 struct sk_buff *skb, struct tcmsg*);
179 int (*dump_stats)(struct Qdisc *, unsigned long,
180 struct gnet_dump *);
181 };
182
183 struct Qdisc_ops {
184 struct Qdisc_ops *next;
185 const struct Qdisc_class_ops *cl_ops;
186 char id[IFNAMSIZ];
187 int priv_size;
188 unsigned int static_flags;
189
190 int (*enqueue)(struct sk_buff *skb,
191 struct Qdisc *sch,
192 struct sk_buff **to_free);
193 struct sk_buff * (*dequeue)(struct Qdisc *);
194 struct sk_buff * (*peek)(struct Qdisc *);
195
196 int (*init)(struct Qdisc *sch, struct nlattr *arg,
197 struct netlink_ext_ack *extack);
198 void (*reset)(struct Qdisc *);
199 void (*destroy)(struct Qdisc *);
200 int (*change)(struct Qdisc *sch,
201 struct nlattr *arg,
202 struct netlink_ext_ack *extack);
203 void (*attach)(struct Qdisc *sch);
204 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
205
206 int (*dump)(struct Qdisc *, struct sk_buff *);
207 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
208
209 void (*ingress_block_set)(struct Qdisc *sch,
210 u32 block_index);
211 void (*egress_block_set)(struct Qdisc *sch,
212 u32 block_index);
213 u32 (*ingress_block_get)(struct Qdisc *sch);
214 u32 (*egress_block_get)(struct Qdisc *sch);
215
216 struct module *owner;
217 };
218
219
220 struct tcf_result {
221 union {
222 struct {
223 unsigned long class;
224 u32 classid;
225 };
226 const struct tcf_proto *goto_tp;
227 };
228 };
229
230 struct tcf_proto_ops {
231 struct list_head head;
232 char kind[IFNAMSIZ];
233
234 int (*classify)(struct sk_buff *,
235 const struct tcf_proto *,
236 struct tcf_result *);
237 int (*init)(struct tcf_proto*);
238 void (*destroy)(struct tcf_proto *tp,
239 struct netlink_ext_ack *extack);
240
241 void* (*get)(struct tcf_proto*, u32 handle);
242 int (*change)(struct net *net, struct sk_buff *,
243 struct tcf_proto*, unsigned long,
244 u32 handle, struct nlattr **,
245 void **, bool,
246 struct netlink_ext_ack *);
247 int (*delete)(struct tcf_proto *tp, void *arg,
248 bool *last,
249 struct netlink_ext_ack *);
250 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
251 void (*bind_class)(void *, u32, unsigned long);
252
253 /* rtnetlink specific */
254 int (*dump)(struct net*, struct tcf_proto*, void *,
255 struct sk_buff *skb, struct tcmsg*);
256
257 struct module *owner;
258 };
259
260 struct tcf_proto {
261 /* Fast access part */
262 struct tcf_proto __rcu *next;
263 void __rcu *root;
264 int (*classify)(struct sk_buff *,
265 const struct tcf_proto *,
266 struct tcf_result *);
267 __be16 protocol;
268
269 /* All the rest */
270 u32 prio;
271 void *data;
272 const struct tcf_proto_ops *ops;
273 struct tcf_chain *chain;
274 struct rcu_head rcu;
275 };
276
277 struct qdisc_skb_cb {
278 unsigned int pkt_len;
279 u16 slave_dev_queue_mapping;
280 u16 tc_classid;
281 #define QDISC_CB_PRIV_LEN 20
282 unsigned char data[QDISC_CB_PRIV_LEN];
283 };
284
285 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
286
287 struct tcf_chain {
288 struct tcf_proto __rcu *filter_chain;
289 struct list_head filter_chain_list;
290 struct list_head list;
291 struct tcf_block *block;
292 u32 index; /* chain index */
293 unsigned int refcnt;
294 };
295
296 struct tcf_block {
297 struct list_head chain_list;
298 u32 index; /* block index for shared blocks */
299 unsigned int refcnt;
300 struct net *net;
301 struct Qdisc *q;
302 struct list_head cb_list;
303 struct list_head owner_list;
304 bool keep_dst;
305 unsigned int offloadcnt; /* Number of oddloaded filters */
306 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
307 };
308
309 static inline void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
310 {
311 if (*flags & TCA_CLS_FLAGS_IN_HW)
312 return;
313 *flags |= TCA_CLS_FLAGS_IN_HW;
314 block->offloadcnt++;
315 }
316
317 static inline void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
318 {
319 if (!(*flags & TCA_CLS_FLAGS_IN_HW))
320 return;
321 *flags &= ~TCA_CLS_FLAGS_IN_HW;
322 block->offloadcnt--;
323 }
324
325 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
326 {
327 struct qdisc_skb_cb *qcb;
328
329 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
330 BUILD_BUG_ON(sizeof(qcb->data) < sz);
331 }
332
333 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
334 {
335 return this_cpu_ptr(q->cpu_qstats)->qlen;
336 }
337
338 static inline int qdisc_qlen(const struct Qdisc *q)
339 {
340 return q->q.qlen;
341 }
342
343 static inline int qdisc_qlen_sum(const struct Qdisc *q)
344 {
345 __u32 qlen = 0;
346 int i;
347
348 if (q->flags & TCQ_F_NOLOCK) {
349 for_each_possible_cpu(i)
350 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
351 } else {
352 qlen = q->q.qlen;
353 }
354
355 return qlen;
356 }
357
358 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
359 {
360 return (struct qdisc_skb_cb *)skb->cb;
361 }
362
363 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
364 {
365 return &qdisc->q.lock;
366 }
367
368 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
369 {
370 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
371
372 return q;
373 }
374
375 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
376 {
377 return qdisc->dev_queue->qdisc_sleeping;
378 }
379
380 /* The qdisc root lock is a mechanism by which to top level
381 * of a qdisc tree can be locked from any qdisc node in the
382 * forest. This allows changing the configuration of some
383 * aspect of the qdisc tree while blocking out asynchronous
384 * qdisc access in the packet processing paths.
385 *
386 * It is only legal to do this when the root will not change
387 * on us. Otherwise we'll potentially lock the wrong qdisc
388 * root. This is enforced by holding the RTNL semaphore, which
389 * all users of this lock accessor must do.
390 */
391 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
392 {
393 struct Qdisc *root = qdisc_root(qdisc);
394
395 ASSERT_RTNL();
396 return qdisc_lock(root);
397 }
398
399 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
400 {
401 struct Qdisc *root = qdisc_root_sleeping(qdisc);
402
403 ASSERT_RTNL();
404 return qdisc_lock(root);
405 }
406
407 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
408 {
409 struct Qdisc *root = qdisc_root_sleeping(qdisc);
410
411 ASSERT_RTNL();
412 return &root->running;
413 }
414
415 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
416 {
417 return qdisc->dev_queue->dev;
418 }
419
420 static inline void sch_tree_lock(const struct Qdisc *q)
421 {
422 spin_lock_bh(qdisc_root_sleeping_lock(q));
423 }
424
425 static inline void sch_tree_unlock(const struct Qdisc *q)
426 {
427 spin_unlock_bh(qdisc_root_sleeping_lock(q));
428 }
429
430 extern struct Qdisc noop_qdisc;
431 extern struct Qdisc_ops noop_qdisc_ops;
432 extern struct Qdisc_ops pfifo_fast_ops;
433 extern struct Qdisc_ops mq_qdisc_ops;
434 extern struct Qdisc_ops noqueue_qdisc_ops;
435 extern const struct Qdisc_ops *default_qdisc_ops;
436 static inline const struct Qdisc_ops *
437 get_default_qdisc_ops(const struct net_device *dev, int ntx)
438 {
439 return ntx < dev->real_num_tx_queues ?
440 default_qdisc_ops : &pfifo_fast_ops;
441 }
442
443 struct Qdisc_class_common {
444 u32 classid;
445 struct hlist_node hnode;
446 };
447
448 struct Qdisc_class_hash {
449 struct hlist_head *hash;
450 unsigned int hashsize;
451 unsigned int hashmask;
452 unsigned int hashelems;
453 };
454
455 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
456 {
457 id ^= id >> 8;
458 id ^= id >> 4;
459 return id & mask;
460 }
461
462 static inline struct Qdisc_class_common *
463 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
464 {
465 struct Qdisc_class_common *cl;
466 unsigned int h;
467
468 if (!id)
469 return NULL;
470
471 h = qdisc_class_hash(id, hash->hashmask);
472 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
473 if (cl->classid == id)
474 return cl;
475 }
476 return NULL;
477 }
478
479 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
480 {
481 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
482
483 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
484 }
485
486 int qdisc_class_hash_init(struct Qdisc_class_hash *);
487 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
488 struct Qdisc_class_common *);
489 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
490 struct Qdisc_class_common *);
491 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
492 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
493
494 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
495 void dev_init_scheduler(struct net_device *dev);
496 void dev_shutdown(struct net_device *dev);
497 void dev_activate(struct net_device *dev);
498 void dev_deactivate(struct net_device *dev);
499 void dev_deactivate_many(struct list_head *head);
500 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
501 struct Qdisc *qdisc);
502 void qdisc_reset(struct Qdisc *qdisc);
503 void qdisc_destroy(struct Qdisc *qdisc);
504 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
505 unsigned int len);
506 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
507 const struct Qdisc_ops *ops,
508 struct netlink_ext_ack *extack);
509 void qdisc_free(struct Qdisc *qdisc);
510 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
511 const struct Qdisc_ops *ops, u32 parentid,
512 struct netlink_ext_ack *extack);
513 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
514 const struct qdisc_size_table *stab);
515 int skb_do_redirect(struct sk_buff *);
516
517 static inline void skb_reset_tc(struct sk_buff *skb)
518 {
519 #ifdef CONFIG_NET_CLS_ACT
520 skb->tc_redirected = 0;
521 #endif
522 }
523
524 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
525 {
526 #ifdef CONFIG_NET_CLS_ACT
527 return skb->tc_at_ingress;
528 #else
529 return false;
530 #endif
531 }
532
533 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
534 {
535 #ifdef CONFIG_NET_CLS_ACT
536 if (skb->tc_skip_classify) {
537 skb->tc_skip_classify = 0;
538 return true;
539 }
540 #endif
541 return false;
542 }
543
544 /* Reset all TX qdiscs greater then index of a device. */
545 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
546 {
547 struct Qdisc *qdisc;
548
549 for (; i < dev->num_tx_queues; i++) {
550 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
551 if (qdisc) {
552 spin_lock_bh(qdisc_lock(qdisc));
553 qdisc_reset(qdisc);
554 spin_unlock_bh(qdisc_lock(qdisc));
555 }
556 }
557 }
558
559 static inline void qdisc_reset_all_tx(struct net_device *dev)
560 {
561 qdisc_reset_all_tx_gt(dev, 0);
562 }
563
564 /* Are all TX queues of the device empty? */
565 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
566 {
567 unsigned int i;
568
569 rcu_read_lock();
570 for (i = 0; i < dev->num_tx_queues; i++) {
571 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
572 const struct Qdisc *q = rcu_dereference(txq->qdisc);
573
574 if (q->q.qlen) {
575 rcu_read_unlock();
576 return false;
577 }
578 }
579 rcu_read_unlock();
580 return true;
581 }
582
583 /* Are any of the TX qdiscs changing? */
584 static inline bool qdisc_tx_changing(const struct net_device *dev)
585 {
586 unsigned int i;
587
588 for (i = 0; i < dev->num_tx_queues; i++) {
589 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
590 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
591 return true;
592 }
593 return false;
594 }
595
596 /* Is the device using the noop qdisc on all queues? */
597 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
598 {
599 unsigned int i;
600
601 for (i = 0; i < dev->num_tx_queues; i++) {
602 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
603 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
604 return false;
605 }
606 return true;
607 }
608
609 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
610 {
611 return qdisc_skb_cb(skb)->pkt_len;
612 }
613
614 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
615 enum net_xmit_qdisc_t {
616 __NET_XMIT_STOLEN = 0x00010000,
617 __NET_XMIT_BYPASS = 0x00020000,
618 };
619
620 #ifdef CONFIG_NET_CLS_ACT
621 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
622 #else
623 #define net_xmit_drop_count(e) (1)
624 #endif
625
626 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
627 const struct Qdisc *sch)
628 {
629 #ifdef CONFIG_NET_SCHED
630 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
631
632 if (stab)
633 __qdisc_calculate_pkt_len(skb, stab);
634 #endif
635 }
636
637 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
638 struct sk_buff **to_free)
639 {
640 qdisc_calculate_pkt_len(skb, sch);
641 return sch->enqueue(skb, sch, to_free);
642 }
643
644 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
645 {
646 return q->flags & TCQ_F_CPUSTATS;
647 }
648
649 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
650 __u64 bytes, __u32 packets)
651 {
652 bstats->bytes += bytes;
653 bstats->packets += packets;
654 }
655
656 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
657 const struct sk_buff *skb)
658 {
659 _bstats_update(bstats,
660 qdisc_pkt_len(skb),
661 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
662 }
663
664 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
665 __u64 bytes, __u32 packets)
666 {
667 u64_stats_update_begin(&bstats->syncp);
668 _bstats_update(&bstats->bstats, bytes, packets);
669 u64_stats_update_end(&bstats->syncp);
670 }
671
672 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
673 const struct sk_buff *skb)
674 {
675 u64_stats_update_begin(&bstats->syncp);
676 bstats_update(&bstats->bstats, skb);
677 u64_stats_update_end(&bstats->syncp);
678 }
679
680 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
681 const struct sk_buff *skb)
682 {
683 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
684 }
685
686 static inline void qdisc_bstats_update(struct Qdisc *sch,
687 const struct sk_buff *skb)
688 {
689 bstats_update(&sch->bstats, skb);
690 }
691
692 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
693 const struct sk_buff *skb)
694 {
695 sch->qstats.backlog -= qdisc_pkt_len(skb);
696 }
697
698 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
699 const struct sk_buff *skb)
700 {
701 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
702 }
703
704 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
705 const struct sk_buff *skb)
706 {
707 sch->qstats.backlog += qdisc_pkt_len(skb);
708 }
709
710 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
711 const struct sk_buff *skb)
712 {
713 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
714 }
715
716 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
717 {
718 this_cpu_inc(sch->cpu_qstats->qlen);
719 }
720
721 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
722 {
723 this_cpu_dec(sch->cpu_qstats->qlen);
724 }
725
726 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
727 {
728 this_cpu_inc(sch->cpu_qstats->requeues);
729 }
730
731 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
732 {
733 sch->qstats.drops += count;
734 }
735
736 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
737 {
738 qstats->drops++;
739 }
740
741 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
742 {
743 qstats->overlimits++;
744 }
745
746 static inline void qdisc_qstats_drop(struct Qdisc *sch)
747 {
748 qstats_drop_inc(&sch->qstats);
749 }
750
751 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
752 {
753 this_cpu_inc(sch->cpu_qstats->drops);
754 }
755
756 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
757 {
758 sch->qstats.overlimits++;
759 }
760
761 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
762 {
763 qh->head = NULL;
764 qh->tail = NULL;
765 qh->qlen = 0;
766 }
767
768 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
769 struct qdisc_skb_head *qh)
770 {
771 struct sk_buff *last = qh->tail;
772
773 if (last) {
774 skb->next = NULL;
775 last->next = skb;
776 qh->tail = skb;
777 } else {
778 qh->tail = skb;
779 qh->head = skb;
780 }
781 qh->qlen++;
782 qdisc_qstats_backlog_inc(sch, skb);
783
784 return NET_XMIT_SUCCESS;
785 }
786
787 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
788 {
789 return __qdisc_enqueue_tail(skb, sch, &sch->q);
790 }
791
792 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
793 {
794 struct sk_buff *skb = qh->head;
795
796 if (likely(skb != NULL)) {
797 qh->head = skb->next;
798 qh->qlen--;
799 if (qh->head == NULL)
800 qh->tail = NULL;
801 skb->next = NULL;
802 }
803
804 return skb;
805 }
806
807 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
808 {
809 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
810
811 if (likely(skb != NULL)) {
812 qdisc_qstats_backlog_dec(sch, skb);
813 qdisc_bstats_update(sch, skb);
814 }
815
816 return skb;
817 }
818
819 /* Instead of calling kfree_skb() while root qdisc lock is held,
820 * queue the skb for future freeing at end of __dev_xmit_skb()
821 */
822 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
823 {
824 skb->next = *to_free;
825 *to_free = skb;
826 }
827
828 static inline void __qdisc_drop_all(struct sk_buff *skb,
829 struct sk_buff **to_free)
830 {
831 if (skb->prev)
832 skb->prev->next = *to_free;
833 else
834 skb->next = *to_free;
835 *to_free = skb;
836 }
837
838 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
839 struct qdisc_skb_head *qh,
840 struct sk_buff **to_free)
841 {
842 struct sk_buff *skb = __qdisc_dequeue_head(qh);
843
844 if (likely(skb != NULL)) {
845 unsigned int len = qdisc_pkt_len(skb);
846
847 qdisc_qstats_backlog_dec(sch, skb);
848 __qdisc_drop(skb, to_free);
849 return len;
850 }
851
852 return 0;
853 }
854
855 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
856 struct sk_buff **to_free)
857 {
858 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
859 }
860
861 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
862 {
863 const struct qdisc_skb_head *qh = &sch->q;
864
865 return qh->head;
866 }
867
868 /* generic pseudo peek method for non-work-conserving qdisc */
869 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
870 {
871 struct sk_buff *skb = skb_peek(&sch->gso_skb);
872
873 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
874 if (!skb) {
875 skb = sch->dequeue(sch);
876
877 if (skb) {
878 __skb_queue_head(&sch->gso_skb, skb);
879 /* it's still part of the queue */
880 qdisc_qstats_backlog_inc(sch, skb);
881 sch->q.qlen++;
882 }
883 }
884
885 return skb;
886 }
887
888 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
889 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
890 {
891 struct sk_buff *skb = skb_peek(&sch->gso_skb);
892
893 if (skb) {
894 skb = __skb_dequeue(&sch->gso_skb);
895 qdisc_qstats_backlog_dec(sch, skb);
896 sch->q.qlen--;
897 } else {
898 skb = sch->dequeue(sch);
899 }
900
901 return skb;
902 }
903
904 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
905 {
906 /*
907 * We do not know the backlog in bytes of this list, it
908 * is up to the caller to correct it
909 */
910 ASSERT_RTNL();
911 if (qh->qlen) {
912 rtnl_kfree_skbs(qh->head, qh->tail);
913
914 qh->head = NULL;
915 qh->tail = NULL;
916 qh->qlen = 0;
917 }
918 }
919
920 static inline void qdisc_reset_queue(struct Qdisc *sch)
921 {
922 __qdisc_reset_queue(&sch->q);
923 sch->qstats.backlog = 0;
924 }
925
926 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
927 struct Qdisc **pold)
928 {
929 struct Qdisc *old;
930
931 sch_tree_lock(sch);
932 old = *pold;
933 *pold = new;
934 if (old != NULL) {
935 unsigned int qlen = old->q.qlen;
936 unsigned int backlog = old->qstats.backlog;
937
938 qdisc_reset(old);
939 qdisc_tree_reduce_backlog(old, qlen, backlog);
940 }
941 sch_tree_unlock(sch);
942
943 return old;
944 }
945
946 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
947 {
948 rtnl_kfree_skbs(skb, skb);
949 qdisc_qstats_drop(sch);
950 }
951
952 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
953 struct sk_buff **to_free)
954 {
955 __qdisc_drop(skb, to_free);
956 qdisc_qstats_cpu_drop(sch);
957
958 return NET_XMIT_DROP;
959 }
960
961 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
962 struct sk_buff **to_free)
963 {
964 __qdisc_drop(skb, to_free);
965 qdisc_qstats_drop(sch);
966
967 return NET_XMIT_DROP;
968 }
969
970 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
971 struct sk_buff **to_free)
972 {
973 __qdisc_drop_all(skb, to_free);
974 qdisc_qstats_drop(sch);
975
976 return NET_XMIT_DROP;
977 }
978
979 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
980 long it will take to send a packet given its size.
981 */
982 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
983 {
984 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
985 if (slot < 0)
986 slot = 0;
987 slot >>= rtab->rate.cell_log;
988 if (slot > 255)
989 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
990 return rtab->data[slot];
991 }
992
993 struct psched_ratecfg {
994 u64 rate_bytes_ps; /* bytes per second */
995 u32 mult;
996 u16 overhead;
997 u8 linklayer;
998 u8 shift;
999 };
1000
1001 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1002 unsigned int len)
1003 {
1004 len += r->overhead;
1005
1006 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1007 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1008
1009 return ((u64)len * r->mult) >> r->shift;
1010 }
1011
1012 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1013 const struct tc_ratespec *conf,
1014 u64 rate64);
1015
1016 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1017 const struct psched_ratecfg *r)
1018 {
1019 memset(res, 0, sizeof(*res));
1020
1021 /* legacy struct tc_ratespec has a 32bit @rate field
1022 * Qdisc using 64bit rate should add new attributes
1023 * in order to maintain compatibility.
1024 */
1025 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1026
1027 res->overhead = r->overhead;
1028 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1029 }
1030
1031 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1032 * The fast path only needs to access filter list and to update stats
1033 */
1034 struct mini_Qdisc {
1035 struct tcf_proto *filter_list;
1036 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1037 struct gnet_stats_queue __percpu *cpu_qstats;
1038 struct rcu_head rcu;
1039 };
1040
1041 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1042 const struct sk_buff *skb)
1043 {
1044 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1045 }
1046
1047 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1048 {
1049 this_cpu_inc(miniq->cpu_qstats->drops);
1050 }
1051
1052 struct mini_Qdisc_pair {
1053 struct mini_Qdisc miniq1;
1054 struct mini_Qdisc miniq2;
1055 struct mini_Qdisc __rcu **p_miniq;
1056 };
1057
1058 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1059 struct tcf_proto *tp_head);
1060 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1061 struct mini_Qdisc __rcu **p_miniq);
1062
1063 #endif
Linux with added FPC-III support