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staging: rtl8188eu: rename HalSetBrateCfg() - style
[linux/fpc-iii.git] / include / net / sch_generic.h
bloba6d00093f35e70d9b5da920be22ae4fd1db0bb6a
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 typedef int tc_setup_cb_t(enum tc_setup_type type,
24 void *type_data, void *cb_priv);
25
26 struct qdisc_rate_table {
27 struct tc_ratespec rate;
28 u32 data[256];
29 struct qdisc_rate_table *next;
30 int refcnt;
31 };
32
33 enum qdisc_state_t {
34 __QDISC_STATE_SCHED,
35 __QDISC_STATE_DEACTIVATED,
36 };
37
38 struct qdisc_size_table {
39 struct rcu_head rcu;
40 struct list_head list;
41 struct tc_sizespec szopts;
42 int refcnt;
43 u16 data[];
44 };
45
46 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
47 struct qdisc_skb_head {
48 struct sk_buff *head;
49 struct sk_buff *tail;
50 __u32 qlen;
51 spinlock_t lock;
52 };
53
54 struct Qdisc {
55 int (*enqueue)(struct sk_buff *skb,
56 struct Qdisc *sch,
57 struct sk_buff **to_free);
58 struct sk_buff * (*dequeue)(struct Qdisc *sch);
59 unsigned int flags;
60 #define TCQ_F_BUILTIN 1
61 #define TCQ_F_INGRESS 2
62 #define TCQ_F_CAN_BYPASS 4
63 #define TCQ_F_MQROOT 8
64 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
65 * q->dev_queue : It can test
66 * netif_xmit_frozen_or_stopped() before
67 * dequeueing next packet.
68 * Its true for MQ/MQPRIO slaves, or non
69 * multiqueue device.
70 */
71 #define TCQ_F_WARN_NONWC (1 << 16)
72 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
73 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
74 * qdisc_tree_decrease_qlen() should stop.
75 */
76 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
77 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
78 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
79 u32 limit;
80 const struct Qdisc_ops *ops;
81 struct qdisc_size_table __rcu *stab;
82 struct hlist_node hash;
83 u32 handle;
84 u32 parent;
85
86 struct netdev_queue *dev_queue;
87
88 struct net_rate_estimator __rcu *rate_est;
89 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
90 struct gnet_stats_queue __percpu *cpu_qstats;
91 int padded;
92 refcount_t refcnt;
93
94 /*
95 * For performance sake on SMP, we put highly modified fields at the end
96 */
97 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
98 struct qdisc_skb_head q;
99 struct gnet_stats_basic_packed bstats;
100 seqcount_t running;
101 struct gnet_stats_queue qstats;
102 unsigned long state;
103 struct Qdisc *next_sched;
104 struct sk_buff_head skb_bad_txq;
105
106 spinlock_t busylock ____cacheline_aligned_in_smp;
107 spinlock_t seqlock;
108 };
109
110 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
111 {
112 if (qdisc->flags & TCQ_F_BUILTIN)
113 return;
114 refcount_inc(&qdisc->refcnt);
115 }
116
117 static inline bool qdisc_is_running(struct Qdisc *qdisc)
118 {
119 if (qdisc->flags & TCQ_F_NOLOCK)
120 return spin_is_locked(&qdisc->seqlock);
121 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
122 }
123
124 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
125 {
126 if (qdisc->flags & TCQ_F_NOLOCK) {
127 if (!spin_trylock(&qdisc->seqlock))
128 return false;
129 } else if (qdisc_is_running(qdisc)) {
130 return false;
131 }
132 /* Variant of write_seqcount_begin() telling lockdep a trylock
133 * was attempted.
134 */
135 raw_write_seqcount_begin(&qdisc->running);
136 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
137 return true;
138 }
139
140 static inline void qdisc_run_end(struct Qdisc *qdisc)
141 {
142 write_seqcount_end(&qdisc->running);
143 if (qdisc->flags & TCQ_F_NOLOCK)
144 spin_unlock(&qdisc->seqlock);
145 }
146
147 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
148 {
149 return qdisc->flags & TCQ_F_ONETXQUEUE;
150 }
151
152 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
153 {
154 #ifdef CONFIG_BQL
155 /* Non-BQL migrated drivers will return 0, too. */
156 return dql_avail(&txq->dql);
157 #else
158 return 0;
159 #endif
160 }
161
162 struct Qdisc_class_ops {
163 /* Child qdisc manipulation */
164 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
165 int (*graft)(struct Qdisc *, unsigned long cl,
166 struct Qdisc *, struct Qdisc **,
167 struct netlink_ext_ack *extack);
168 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
169 void (*qlen_notify)(struct Qdisc *, unsigned long);
170
171 /* Class manipulation routines */
172 unsigned long (*find)(struct Qdisc *, u32 classid);
173 int (*change)(struct Qdisc *, u32, u32,
174 struct nlattr **, unsigned long *,
175 struct netlink_ext_ack *);
176 int (*delete)(struct Qdisc *, unsigned long);
177 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
178
179 /* Filter manipulation */
180 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
181 unsigned long arg,
182 struct netlink_ext_ack *extack);
183 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
184 u32 classid);
185 void (*unbind_tcf)(struct Qdisc *, unsigned long);
186
187 /* rtnetlink specific */
188 int (*dump)(struct Qdisc *, unsigned long,
189 struct sk_buff *skb, struct tcmsg*);
190 int (*dump_stats)(struct Qdisc *, unsigned long,
191 struct gnet_dump *);
192 };
193
194 struct Qdisc_ops {
195 struct Qdisc_ops *next;
196 const struct Qdisc_class_ops *cl_ops;
197 char id[IFNAMSIZ];
198 int priv_size;
199 unsigned int static_flags;
200
201 int (*enqueue)(struct sk_buff *skb,
202 struct Qdisc *sch,
203 struct sk_buff **to_free);
204 struct sk_buff * (*dequeue)(struct Qdisc *);
205 struct sk_buff * (*peek)(struct Qdisc *);
206
207 int (*init)(struct Qdisc *sch, struct nlattr *arg,
208 struct netlink_ext_ack *extack);
209 void (*reset)(struct Qdisc *);
210 void (*destroy)(struct Qdisc *);
211 int (*change)(struct Qdisc *sch,
212 struct nlattr *arg,
213 struct netlink_ext_ack *extack);
214 void (*attach)(struct Qdisc *sch);
215 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
216
217 int (*dump)(struct Qdisc *, struct sk_buff *);
218 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
219
220 void (*ingress_block_set)(struct Qdisc *sch,
221 u32 block_index);
222 void (*egress_block_set)(struct Qdisc *sch,
223 u32 block_index);
224 u32 (*ingress_block_get)(struct Qdisc *sch);
225 u32 (*egress_block_get)(struct Qdisc *sch);
226
227 struct module *owner;
228 };
229
230
231 struct tcf_result {
232 union {
233 struct {
234 unsigned long class;
235 u32 classid;
236 };
237 const struct tcf_proto *goto_tp;
238
239 /* used by the TC_ACT_REINSERT action */
240 struct {
241 bool ingress;
242 struct gnet_stats_queue *qstats;
243 };
244 };
245 };
246
247 struct tcf_chain;
248
249 struct tcf_proto_ops {
250 struct list_head head;
251 char kind[IFNAMSIZ];
252
253 int (*classify)(struct sk_buff *,
254 const struct tcf_proto *,
255 struct tcf_result *);
256 int (*init)(struct tcf_proto*);
257 void (*destroy)(struct tcf_proto *tp,
258 struct netlink_ext_ack *extack);
259
260 void* (*get)(struct tcf_proto*, u32 handle);
261 int (*change)(struct net *net, struct sk_buff *,
262 struct tcf_proto*, unsigned long,
263 u32 handle, struct nlattr **,
264 void **, bool,
265 struct netlink_ext_ack *);
266 int (*delete)(struct tcf_proto *tp, void *arg,
267 bool *last,
268 struct netlink_ext_ack *);
269 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
270 int (*reoffload)(struct tcf_proto *tp, bool add,
271 tc_setup_cb_t *cb, void *cb_priv,
272 struct netlink_ext_ack *extack);
273 void (*bind_class)(void *, u32, unsigned long);
274 void * (*tmplt_create)(struct net *net,
275 struct tcf_chain *chain,
276 struct nlattr **tca,
277 struct netlink_ext_ack *extack);
278 void (*tmplt_destroy)(void *tmplt_priv);
279
280 /* rtnetlink specific */
281 int (*dump)(struct net*, struct tcf_proto*, void *,
282 struct sk_buff *skb, struct tcmsg*);
283 int (*tmplt_dump)(struct sk_buff *skb,
284 struct net *net,
285 void *tmplt_priv);
286
287 struct module *owner;
288 };
289
290 struct tcf_proto {
291 /* Fast access part */
292 struct tcf_proto __rcu *next;
293 void __rcu *root;
294
295 /* called under RCU BH lock*/
296 int (*classify)(struct sk_buff *,
297 const struct tcf_proto *,
298 struct tcf_result *);
299 __be16 protocol;
300
301 /* All the rest */
302 u32 prio;
303 void *data;
304 const struct tcf_proto_ops *ops;
305 struct tcf_chain *chain;
306 struct rcu_head rcu;
307 };
308
309 struct qdisc_skb_cb {
310 unsigned int pkt_len;
311 u16 slave_dev_queue_mapping;
312 u16 tc_classid;
313 #define QDISC_CB_PRIV_LEN 20
314 unsigned char data[QDISC_CB_PRIV_LEN];
315 };
316
317 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
318
319 struct tcf_chain {
320 struct tcf_proto __rcu *filter_chain;
321 struct list_head list;
322 struct tcf_block *block;
323 u32 index; /* chain index */
324 unsigned int refcnt;
325 unsigned int action_refcnt;
326 bool explicitly_created;
327 const struct tcf_proto_ops *tmplt_ops;
328 void *tmplt_priv;
329 };
330
331 struct tcf_block {
332 struct list_head chain_list;
333 u32 index; /* block index for shared blocks */
334 unsigned int refcnt;
335 struct net *net;
336 struct Qdisc *q;
337 struct list_head cb_list;
338 struct list_head owner_list;
339 bool keep_dst;
340 unsigned int offloadcnt; /* Number of oddloaded filters */
341 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
342 struct {
343 struct tcf_chain *chain;
344 struct list_head filter_chain_list;
345 } chain0;
346 };
347
348 static inline void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
349 {
350 if (*flags & TCA_CLS_FLAGS_IN_HW)
351 return;
352 *flags |= TCA_CLS_FLAGS_IN_HW;
353 block->offloadcnt++;
354 }
355
356 static inline void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
357 {
358 if (!(*flags & TCA_CLS_FLAGS_IN_HW))
359 return;
360 *flags &= ~TCA_CLS_FLAGS_IN_HW;
361 block->offloadcnt--;
362 }
363
364 static inline void
365 tc_cls_offload_cnt_update(struct tcf_block *block, unsigned int *cnt,
366 u32 *flags, bool add)
367 {
368 if (add) {
369 if (!*cnt)
370 tcf_block_offload_inc(block, flags);
371 (*cnt)++;
372 } else {
373 (*cnt)--;
374 if (!*cnt)
375 tcf_block_offload_dec(block, flags);
376 }
377 }
378
379 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
380 {
381 struct qdisc_skb_cb *qcb;
382
383 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
384 BUILD_BUG_ON(sizeof(qcb->data) < sz);
385 }
386
387 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
388 {
389 return this_cpu_ptr(q->cpu_qstats)->qlen;
390 }
391
392 static inline int qdisc_qlen(const struct Qdisc *q)
393 {
394 return q->q.qlen;
395 }
396
397 static inline int qdisc_qlen_sum(const struct Qdisc *q)
398 {
399 __u32 qlen = q->qstats.qlen;
400 int i;
401
402 if (q->flags & TCQ_F_NOLOCK) {
403 for_each_possible_cpu(i)
404 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
405 } else {
406 qlen += q->q.qlen;
407 }
408
409 return qlen;
410 }
411
412 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
413 {
414 return (struct qdisc_skb_cb *)skb->cb;
415 }
416
417 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
418 {
419 return &qdisc->q.lock;
420 }
421
422 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
423 {
424 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
425
426 return q;
427 }
428
429 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
430 {
431 return qdisc->dev_queue->qdisc_sleeping;
432 }
433
434 /* The qdisc root lock is a mechanism by which to top level
435 * of a qdisc tree can be locked from any qdisc node in the
436 * forest. This allows changing the configuration of some
437 * aspect of the qdisc tree while blocking out asynchronous
438 * qdisc access in the packet processing paths.
439 *
440 * It is only legal to do this when the root will not change
441 * on us. Otherwise we'll potentially lock the wrong qdisc
442 * root. This is enforced by holding the RTNL semaphore, which
443 * all users of this lock accessor must do.
444 */
445 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
446 {
447 struct Qdisc *root = qdisc_root(qdisc);
448
449 ASSERT_RTNL();
450 return qdisc_lock(root);
451 }
452
453 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
454 {
455 struct Qdisc *root = qdisc_root_sleeping(qdisc);
456
457 ASSERT_RTNL();
458 return qdisc_lock(root);
459 }
460
461 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
462 {
463 struct Qdisc *root = qdisc_root_sleeping(qdisc);
464
465 ASSERT_RTNL();
466 return &root->running;
467 }
468
469 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
470 {
471 return qdisc->dev_queue->dev;
472 }
473
474 static inline void sch_tree_lock(const struct Qdisc *q)
475 {
476 spin_lock_bh(qdisc_root_sleeping_lock(q));
477 }
478
479 static inline void sch_tree_unlock(const struct Qdisc *q)
480 {
481 spin_unlock_bh(qdisc_root_sleeping_lock(q));
482 }
483
484 extern struct Qdisc noop_qdisc;
485 extern struct Qdisc_ops noop_qdisc_ops;
486 extern struct Qdisc_ops pfifo_fast_ops;
487 extern struct Qdisc_ops mq_qdisc_ops;
488 extern struct Qdisc_ops noqueue_qdisc_ops;
489 extern const struct Qdisc_ops *default_qdisc_ops;
490 static inline const struct Qdisc_ops *
491 get_default_qdisc_ops(const struct net_device *dev, int ntx)
492 {
493 return ntx < dev->real_num_tx_queues ?
494 default_qdisc_ops : &pfifo_fast_ops;
495 }
496
497 struct Qdisc_class_common {
498 u32 classid;
499 struct hlist_node hnode;
500 };
501
502 struct Qdisc_class_hash {
503 struct hlist_head *hash;
504 unsigned int hashsize;
505 unsigned int hashmask;
506 unsigned int hashelems;
507 };
508
509 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
510 {
511 id ^= id >> 8;
512 id ^= id >> 4;
513 return id & mask;
514 }
515
516 static inline struct Qdisc_class_common *
517 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
518 {
519 struct Qdisc_class_common *cl;
520 unsigned int h;
521
522 if (!id)
523 return NULL;
524
525 h = qdisc_class_hash(id, hash->hashmask);
526 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
527 if (cl->classid == id)
528 return cl;
529 }
530 return NULL;
531 }
532
533 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
534 {
535 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
536
537 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
538 }
539
540 int qdisc_class_hash_init(struct Qdisc_class_hash *);
541 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
542 struct Qdisc_class_common *);
543 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
544 struct Qdisc_class_common *);
545 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
546 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
547
548 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
549 void dev_init_scheduler(struct net_device *dev);
550 void dev_shutdown(struct net_device *dev);
551 void dev_activate(struct net_device *dev);
552 void dev_deactivate(struct net_device *dev);
553 void dev_deactivate_many(struct list_head *head);
554 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
555 struct Qdisc *qdisc);
556 void qdisc_reset(struct Qdisc *qdisc);
557 void qdisc_destroy(struct Qdisc *qdisc);
558 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
559 unsigned int len);
560 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
561 const struct Qdisc_ops *ops,
562 struct netlink_ext_ack *extack);
563 void qdisc_free(struct Qdisc *qdisc);
564 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
565 const struct Qdisc_ops *ops, u32 parentid,
566 struct netlink_ext_ack *extack);
567 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
568 const struct qdisc_size_table *stab);
569 int skb_do_redirect(struct sk_buff *);
570
571 static inline void skb_reset_tc(struct sk_buff *skb)
572 {
573 #ifdef CONFIG_NET_CLS_ACT
574 skb->tc_redirected = 0;
575 #endif
576 }
577
578 static inline bool skb_is_tc_redirected(const struct sk_buff *skb)
579 {
580 #ifdef CONFIG_NET_CLS_ACT
581 return skb->tc_redirected;
582 #else
583 return false;
584 #endif
585 }
586
587 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
588 {
589 #ifdef CONFIG_NET_CLS_ACT
590 return skb->tc_at_ingress;
591 #else
592 return false;
593 #endif
594 }
595
596 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
597 {
598 #ifdef CONFIG_NET_CLS_ACT
599 if (skb->tc_skip_classify) {
600 skb->tc_skip_classify = 0;
601 return true;
602 }
603 #endif
604 return false;
605 }
606
607 /* Reset all TX qdiscs greater than index of a device. */
608 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
609 {
610 struct Qdisc *qdisc;
611
612 for (; i < dev->num_tx_queues; i++) {
613 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
614 if (qdisc) {
615 spin_lock_bh(qdisc_lock(qdisc));
616 qdisc_reset(qdisc);
617 spin_unlock_bh(qdisc_lock(qdisc));
618 }
619 }
620 }
621
622 static inline void qdisc_reset_all_tx(struct net_device *dev)
623 {
624 qdisc_reset_all_tx_gt(dev, 0);
625 }
626
627 /* Are all TX queues of the device empty? */
628 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
629 {
630 unsigned int i;
631
632 rcu_read_lock();
633 for (i = 0; i < dev->num_tx_queues; i++) {
634 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
635 const struct Qdisc *q = rcu_dereference(txq->qdisc);
636
637 if (q->q.qlen) {
638 rcu_read_unlock();
639 return false;
640 }
641 }
642 rcu_read_unlock();
643 return true;
644 }
645
646 /* Are any of the TX qdiscs changing? */
647 static inline bool qdisc_tx_changing(const struct net_device *dev)
648 {
649 unsigned int i;
650
651 for (i = 0; i < dev->num_tx_queues; i++) {
652 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
653 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
654 return true;
655 }
656 return false;
657 }
658
659 /* Is the device using the noop qdisc on all queues? */
660 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
661 {
662 unsigned int i;
663
664 for (i = 0; i < dev->num_tx_queues; i++) {
665 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
666 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
667 return false;
668 }
669 return true;
670 }
671
672 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
673 {
674 return qdisc_skb_cb(skb)->pkt_len;
675 }
676
677 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
678 enum net_xmit_qdisc_t {
679 __NET_XMIT_STOLEN = 0x00010000,
680 __NET_XMIT_BYPASS = 0x00020000,
681 };
682
683 #ifdef CONFIG_NET_CLS_ACT
684 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
685 #else
686 #define net_xmit_drop_count(e) (1)
687 #endif
688
689 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
690 const struct Qdisc *sch)
691 {
692 #ifdef CONFIG_NET_SCHED
693 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
694
695 if (stab)
696 __qdisc_calculate_pkt_len(skb, stab);
697 #endif
698 }
699
700 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
701 struct sk_buff **to_free)
702 {
703 qdisc_calculate_pkt_len(skb, sch);
704 return sch->enqueue(skb, sch, to_free);
705 }
706
707 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
708 {
709 return q->flags & TCQ_F_CPUSTATS;
710 }
711
712 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
713 __u64 bytes, __u32 packets)
714 {
715 bstats->bytes += bytes;
716 bstats->packets += packets;
717 }
718
719 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
720 const struct sk_buff *skb)
721 {
722 _bstats_update(bstats,
723 qdisc_pkt_len(skb),
724 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
725 }
726
727 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
728 __u64 bytes, __u32 packets)
729 {
730 u64_stats_update_begin(&bstats->syncp);
731 _bstats_update(&bstats->bstats, bytes, packets);
732 u64_stats_update_end(&bstats->syncp);
733 }
734
735 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
736 const struct sk_buff *skb)
737 {
738 u64_stats_update_begin(&bstats->syncp);
739 bstats_update(&bstats->bstats, skb);
740 u64_stats_update_end(&bstats->syncp);
741 }
742
743 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
744 const struct sk_buff *skb)
745 {
746 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
747 }
748
749 static inline void qdisc_bstats_update(struct Qdisc *sch,
750 const struct sk_buff *skb)
751 {
752 bstats_update(&sch->bstats, skb);
753 }
754
755 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
756 const struct sk_buff *skb)
757 {
758 sch->qstats.backlog -= qdisc_pkt_len(skb);
759 }
760
761 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
762 const struct sk_buff *skb)
763 {
764 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
765 }
766
767 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
768 const struct sk_buff *skb)
769 {
770 sch->qstats.backlog += qdisc_pkt_len(skb);
771 }
772
773 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
774 const struct sk_buff *skb)
775 {
776 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
777 }
778
779 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
780 {
781 this_cpu_inc(sch->cpu_qstats->qlen);
782 }
783
784 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
785 {
786 this_cpu_dec(sch->cpu_qstats->qlen);
787 }
788
789 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
790 {
791 this_cpu_inc(sch->cpu_qstats->requeues);
792 }
793
794 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
795 {
796 sch->qstats.drops += count;
797 }
798
799 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
800 {
801 qstats->drops++;
802 }
803
804 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
805 {
806 qstats->overlimits++;
807 }
808
809 static inline void qdisc_qstats_drop(struct Qdisc *sch)
810 {
811 qstats_drop_inc(&sch->qstats);
812 }
813
814 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
815 {
816 this_cpu_inc(sch->cpu_qstats->drops);
817 }
818
819 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
820 {
821 sch->qstats.overlimits++;
822 }
823
824 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
825 {
826 qh->head = NULL;
827 qh->tail = NULL;
828 qh->qlen = 0;
829 }
830
831 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
832 struct qdisc_skb_head *qh)
833 {
834 struct sk_buff *last = qh->tail;
835
836 if (last) {
837 skb->next = NULL;
838 last->next = skb;
839 qh->tail = skb;
840 } else {
841 qh->tail = skb;
842 qh->head = skb;
843 }
844 qh->qlen++;
845 qdisc_qstats_backlog_inc(sch, skb);
846
847 return NET_XMIT_SUCCESS;
848 }
849
850 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
851 {
852 return __qdisc_enqueue_tail(skb, sch, &sch->q);
853 }
854
855 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
856 {
857 struct sk_buff *skb = qh->head;
858
859 if (likely(skb != NULL)) {
860 qh->head = skb->next;
861 qh->qlen--;
862 if (qh->head == NULL)
863 qh->tail = NULL;
864 skb->next = NULL;
865 }
866
867 return skb;
868 }
869
870 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
871 {
872 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
873
874 if (likely(skb != NULL)) {
875 qdisc_qstats_backlog_dec(sch, skb);
876 qdisc_bstats_update(sch, skb);
877 }
878
879 return skb;
880 }
881
882 /* Instead of calling kfree_skb() while root qdisc lock is held,
883 * queue the skb for future freeing at end of __dev_xmit_skb()
884 */
885 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
886 {
887 skb->next = *to_free;
888 *to_free = skb;
889 }
890
891 static inline void __qdisc_drop_all(struct sk_buff *skb,
892 struct sk_buff **to_free)
893 {
894 if (skb->prev)
895 skb->prev->next = *to_free;
896 else
897 skb->next = *to_free;
898 *to_free = skb;
899 }
900
901 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
902 struct qdisc_skb_head *qh,
903 struct sk_buff **to_free)
904 {
905 struct sk_buff *skb = __qdisc_dequeue_head(qh);
906
907 if (likely(skb != NULL)) {
908 unsigned int len = qdisc_pkt_len(skb);
909
910 qdisc_qstats_backlog_dec(sch, skb);
911 __qdisc_drop(skb, to_free);
912 return len;
913 }
914
915 return 0;
916 }
917
918 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
919 struct sk_buff **to_free)
920 {
921 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
922 }
923
924 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
925 {
926 const struct qdisc_skb_head *qh = &sch->q;
927
928 return qh->head;
929 }
930
931 /* generic pseudo peek method for non-work-conserving qdisc */
932 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
933 {
934 struct sk_buff *skb = skb_peek(&sch->gso_skb);
935
936 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
937 if (!skb) {
938 skb = sch->dequeue(sch);
939
940 if (skb) {
941 __skb_queue_head(&sch->gso_skb, skb);
942 /* it's still part of the queue */
943 qdisc_qstats_backlog_inc(sch, skb);
944 sch->q.qlen++;
945 }
946 }
947
948 return skb;
949 }
950
951 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
952 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
953 {
954 struct sk_buff *skb = skb_peek(&sch->gso_skb);
955
956 if (skb) {
957 skb = __skb_dequeue(&sch->gso_skb);
958 qdisc_qstats_backlog_dec(sch, skb);
959 sch->q.qlen--;
960 } else {
961 skb = sch->dequeue(sch);
962 }
963
964 return skb;
965 }
966
967 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
968 {
969 /*
970 * We do not know the backlog in bytes of this list, it
971 * is up to the caller to correct it
972 */
973 ASSERT_RTNL();
974 if (qh->qlen) {
975 rtnl_kfree_skbs(qh->head, qh->tail);
976
977 qh->head = NULL;
978 qh->tail = NULL;
979 qh->qlen = 0;
980 }
981 }
982
983 static inline void qdisc_reset_queue(struct Qdisc *sch)
984 {
985 __qdisc_reset_queue(&sch->q);
986 sch->qstats.backlog = 0;
987 }
988
989 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
990 struct Qdisc **pold)
991 {
992 struct Qdisc *old;
993
994 sch_tree_lock(sch);
995 old = *pold;
996 *pold = new;
997 if (old != NULL) {
998 unsigned int qlen = old->q.qlen;
999 unsigned int backlog = old->qstats.backlog;
1000
1001 qdisc_reset(old);
1002 qdisc_tree_reduce_backlog(old, qlen, backlog);
1003 }
1004 sch_tree_unlock(sch);
1005
1006 return old;
1007 }
1008
1009 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1010 {
1011 rtnl_kfree_skbs(skb, skb);
1012 qdisc_qstats_drop(sch);
1013 }
1014
1015 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1016 struct sk_buff **to_free)
1017 {
1018 __qdisc_drop(skb, to_free);
1019 qdisc_qstats_cpu_drop(sch);
1020
1021 return NET_XMIT_DROP;
1022 }
1023
1024 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1025 struct sk_buff **to_free)
1026 {
1027 __qdisc_drop(skb, to_free);
1028 qdisc_qstats_drop(sch);
1029
1030 return NET_XMIT_DROP;
1031 }
1032
1033 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1034 struct sk_buff **to_free)
1035 {
1036 __qdisc_drop_all(skb, to_free);
1037 qdisc_qstats_drop(sch);
1038
1039 return NET_XMIT_DROP;
1040 }
1041
1042 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1043 long it will take to send a packet given its size.
1044 */
1045 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1046 {
1047 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1048 if (slot < 0)
1049 slot = 0;
1050 slot >>= rtab->rate.cell_log;
1051 if (slot > 255)
1052 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1053 return rtab->data[slot];
1054 }
1055
1056 struct psched_ratecfg {
1057 u64 rate_bytes_ps; /* bytes per second */
1058 u32 mult;
1059 u16 overhead;
1060 u8 linklayer;
1061 u8 shift;
1062 };
1063
1064 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1065 unsigned int len)
1066 {
1067 len += r->overhead;
1068
1069 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1070 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1071
1072 return ((u64)len * r->mult) >> r->shift;
1073 }
1074
1075 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1076 const struct tc_ratespec *conf,
1077 u64 rate64);
1078
1079 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1080 const struct psched_ratecfg *r)
1081 {
1082 memset(res, 0, sizeof(*res));
1083
1084 /* legacy struct tc_ratespec has a 32bit @rate field
1085 * Qdisc using 64bit rate should add new attributes
1086 * in order to maintain compatibility.
1087 */
1088 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1089
1090 res->overhead = r->overhead;
1091 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1092 }
1093
1094 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1095 * The fast path only needs to access filter list and to update stats
1096 */
1097 struct mini_Qdisc {
1098 struct tcf_proto *filter_list;
1099 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1100 struct gnet_stats_queue __percpu *cpu_qstats;
1101 struct rcu_head rcu;
1102 };
1103
1104 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1105 const struct sk_buff *skb)
1106 {
1107 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1108 }
1109
1110 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1111 {
1112 this_cpu_inc(miniq->cpu_qstats->drops);
1113 }
1114
1115 struct mini_Qdisc_pair {
1116 struct mini_Qdisc miniq1;
1117 struct mini_Qdisc miniq2;
1118 struct mini_Qdisc __rcu **p_miniq;
1119 };
1120
1121 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1122 struct tcf_proto *tp_head);
1123 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1124 struct mini_Qdisc __rcu **p_miniq);
1125
1126 static inline void skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res)
1127 {
1128 struct gnet_stats_queue *stats = res->qstats;
1129 int ret;
1130
1131 if (res->ingress)
1132 ret = netif_receive_skb(skb);
1133 else
1134 ret = dev_queue_xmit(skb);
1135 if (ret && stats)
1136 qstats_overlimit_inc(res->qstats);
1137 }
1138
1139 #endif
Linux with added FPC-III support