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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
18struct Qdisc_ops;
19struct qdisc_walker;
20struct tcf_walker;
21struct module;
22
23struct qdisc_rate_table {
24 struct tc_ratespec rate;
25 u32 data[256];
26 struct qdisc_rate_table *next;
27 int refcnt;
28};
29
30enum qdisc_state_t {
31 __QDISC_STATE_SCHED,
32 __QDISC_STATE_DEACTIVATED,
33 __QDISC_STATE_RUNNING,
34};
35
36struct 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. */
45struct qdisc_skb_head {
46 struct sk_buff *head;
47 struct sk_buff *tail;
48 __u32 qlen;
49 spinlock_t lock;
50};
51
52struct 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
107static 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
114static inline bool qdisc_is_running(const struct Qdisc *qdisc)
115{
116 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
117}
118
119static 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
131static inline void qdisc_run_end(struct Qdisc *qdisc)
132{
133 write_seqcount_end(&qdisc->running);
134}
135
136static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
137{
138 return qdisc->flags & TCQ_F_ONETXQUEUE;
139}
140
141static 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
151struct 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
183struct 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
220struct tcf_result {
221 union {
222 struct {
223 unsigned long class;
224 u32 classid;
225 };
226 const struct tcf_proto *goto_tp;
227 };
228};
229
230struct 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
260struct 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
277struct 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
285typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
286
287struct 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
296struct 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
309static 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
317static 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
325static 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
333static inline int qdisc_qlen_cpu(const struct Qdisc *q)
334{
335 return this_cpu_ptr(q->cpu_qstats)->qlen;
336}
337
338static inline int qdisc_qlen(const struct Qdisc *q)
339{
340 return q->q.qlen;
341}
342
343static 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
358static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
359{
360 return (struct qdisc_skb_cb *)skb->cb;
361}
362
363static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
364{
365 return &qdisc->q.lock;
366}
367
368static 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
375static 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 */
391static 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
399static 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
407static 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
415static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
416{
417 return qdisc->dev_queue->dev;
418}
419
420static inline void sch_tree_lock(const struct Qdisc *q)
421{
422 spin_lock_bh(qdisc_root_sleeping_lock(q));
423}
424
425static inline void sch_tree_unlock(const struct Qdisc *q)
426{
427 spin_unlock_bh(qdisc_root_sleeping_lock(q));
428}
429
430extern struct Qdisc noop_qdisc;
431extern struct Qdisc_ops noop_qdisc_ops;
432extern struct Qdisc_ops pfifo_fast_ops;
433extern struct Qdisc_ops mq_qdisc_ops;
434extern struct Qdisc_ops noqueue_qdisc_ops;
435extern const struct Qdisc_ops *default_qdisc_ops;
436static inline const struct Qdisc_ops *
437get_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
443struct Qdisc_class_common {
444 u32 classid;
445 struct hlist_node hnode;
446};
447
448struct Qdisc_class_hash {
449 struct hlist_head *hash;
450 unsigned int hashsize;
451 unsigned int hashmask;
452 unsigned int hashelems;
453};
454
455static 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
462static inline struct Qdisc_class_common *
463qdisc_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
479static 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
486int qdisc_class_hash_init(struct Qdisc_class_hash *);
487void qdisc_class_hash_insert(struct Qdisc_class_hash *,
488 struct Qdisc_class_common *);
489void qdisc_class_hash_remove(struct Qdisc_class_hash *,
490 struct Qdisc_class_common *);
491void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
492void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
493
494int dev_qdisc_change_tx_queue_len(struct net_device *dev);
495void dev_init_scheduler(struct net_device *dev);
496void dev_shutdown(struct net_device *dev);
497void dev_activate(struct net_device *dev);
498void dev_deactivate(struct net_device *dev);
499void dev_deactivate_many(struct list_head *head);
500struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
501 struct Qdisc *qdisc);
502void qdisc_reset(struct Qdisc *qdisc);
503void qdisc_destroy(struct Qdisc *qdisc);
504void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
505 unsigned int len);
506struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
507 const struct Qdisc_ops *ops,
508 struct netlink_ext_ack *extack);
509void qdisc_free(struct Qdisc *qdisc);
510struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
511 const struct Qdisc_ops *ops, u32 parentid,
512 struct netlink_ext_ack *extack);
513void __qdisc_calculate_pkt_len(struct sk_buff *skb,
514 const struct qdisc_size_table *stab);
515int skb_do_redirect(struct sk_buff *);
516
517static 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
524static 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
533static 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 than index of a device. */
545static 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
559static 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? */
565static 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? */
584static 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? */
597static 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
609static 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) */
615enum 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
626static 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
637static 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
644static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
645{
646 return q->flags & TCQ_F_CPUSTATS;
647}
648
649static 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
656static 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
664static 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
672static 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
680static 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
686static inline void qdisc_bstats_update(struct Qdisc *sch,
687 const struct sk_buff *skb)
688{
689 bstats_update(&sch->bstats, skb);
690}
691
692static 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
698static 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
704static 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
710static 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
716static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
717{
718 this_cpu_inc(sch->cpu_qstats->qlen);
719}
720
721static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
722{
723 this_cpu_dec(sch->cpu_qstats->qlen);
724}
725
726static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
727{
728 this_cpu_inc(sch->cpu_qstats->requeues);
729}
730
731static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
732{
733 sch->qstats.drops += count;
734}
735
736static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
737{
738 qstats->drops++;
739}
740
741static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
742{
743 qstats->overlimits++;
744}
745
746static inline void qdisc_qstats_drop(struct Qdisc *sch)
747{
748 qstats_drop_inc(&sch->qstats);
749}
750
751static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
752{
753 this_cpu_inc(sch->cpu_qstats->drops);
754}
755
756static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
757{
758 sch->qstats.overlimits++;
759}
760
761static 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
768static 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
787static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
788{
789 return __qdisc_enqueue_tail(skb, sch, &sch->q);
790}
791
792static 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
807static 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 */
822static 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
828static 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
838static 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
855static 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
861static 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 */
869static 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() */
889static 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
904static 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
920static inline void qdisc_reset_queue(struct Qdisc *sch)
921{
922 __qdisc_reset_queue(&sch->q);
923 sch->qstats.backlog = 0;
924}
925
926static 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
946static 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
952static 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
961static 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
970static 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 */
982static 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
993struct psched_ratecfg {
994 u64 rate_bytes_ps; /* bytes per second */
995 u32 mult;
996 u16 overhead;
997 u8 linklayer;
998 u8 shift;
999};
1000
1001static 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
1012void psched_ratecfg_precompute(struct psched_ratecfg *r,
1013 const struct tc_ratespec *conf,
1014 u64 rate64);
1015
1016static 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 */
1034struct 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
1041static 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
1047static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1048{
1049 this_cpu_inc(miniq->cpu_qstats->drops);
1050}
1051
1052struct mini_Qdisc_pair {
1053 struct mini_Qdisc miniq1;
1054 struct mini_Qdisc miniq2;
1055 struct mini_Qdisc __rcu **p_miniq;
1056};
1057
1058void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1059 struct tcf_proto *tp_head);
1060void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1061 struct mini_Qdisc __rcu **p_miniq);
1062
1063#endif
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __NET_SCHED_GENERIC_H
3#define __NET_SCHED_GENERIC_H
4
5#include <linux/netdevice.h>
6#include <linux/types.h>
7#include <linux/rcupdate.h>
8#include <linux/pkt_sched.h>
9#include <linux/pkt_cls.h>
10#include <linux/percpu.h>
11#include <linux/dynamic_queue_limits.h>
12#include <linux/list.h>
13#include <linux/refcount.h>
14#include <linux/workqueue.h>
15#include <linux/mutex.h>
16#include <linux/rwsem.h>
17#include <linux/atomic.h>
18#include <linux/hashtable.h>
19#include <net/gen_stats.h>
20#include <net/rtnetlink.h>
21#include <net/flow_offload.h>
22
23struct Qdisc_ops;
24struct qdisc_walker;
25struct tcf_walker;
26struct module;
27struct bpf_flow_keys;
28
29struct qdisc_rate_table {
30 struct tc_ratespec rate;
31 u32 data[256];
32 struct qdisc_rate_table *next;
33 int refcnt;
34};
35
36enum qdisc_state_t {
37 __QDISC_STATE_SCHED,
38 __QDISC_STATE_DEACTIVATED,
39};
40
41struct qdisc_size_table {
42 struct rcu_head rcu;
43 struct list_head list;
44 struct tc_sizespec szopts;
45 int refcnt;
46 u16 data[];
47};
48
49/* similar to sk_buff_head, but skb->prev pointer is undefined. */
50struct qdisc_skb_head {
51 struct sk_buff *head;
52 struct sk_buff *tail;
53 __u32 qlen;
54 spinlock_t lock;
55};
56
57struct Qdisc {
58 int (*enqueue)(struct sk_buff *skb,
59 struct Qdisc *sch,
60 struct sk_buff **to_free);
61 struct sk_buff * (*dequeue)(struct Qdisc *sch);
62 unsigned int flags;
63#define TCQ_F_BUILTIN 1
64#define TCQ_F_INGRESS 2
65#define TCQ_F_CAN_BYPASS 4
66#define TCQ_F_MQROOT 8
67#define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
68 * q->dev_queue : It can test
69 * netif_xmit_frozen_or_stopped() before
70 * dequeueing next packet.
71 * Its true for MQ/MQPRIO slaves, or non
72 * multiqueue device.
73 */
74#define TCQ_F_WARN_NONWC (1 << 16)
75#define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
76#define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
77 * qdisc_tree_decrease_qlen() should stop.
78 */
79#define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
80#define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
81#define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
82 u32 limit;
83 const struct Qdisc_ops *ops;
84 struct qdisc_size_table __rcu *stab;
85 struct hlist_node hash;
86 u32 handle;
87 u32 parent;
88
89 struct netdev_queue *dev_queue;
90
91 struct net_rate_estimator __rcu *rate_est;
92 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
93 struct gnet_stats_queue __percpu *cpu_qstats;
94 int padded;
95 refcount_t refcnt;
96
97 /*
98 * For performance sake on SMP, we put highly modified fields at the end
99 */
100 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
101 struct qdisc_skb_head q;
102 struct gnet_stats_basic_packed bstats;
103 seqcount_t running;
104 struct gnet_stats_queue qstats;
105 unsigned long state;
106 struct Qdisc *next_sched;
107 struct sk_buff_head skb_bad_txq;
108
109 spinlock_t busylock ____cacheline_aligned_in_smp;
110 spinlock_t seqlock;
111
112 /* for NOLOCK qdisc, true if there are no enqueued skbs */
113 bool empty;
114 struct rcu_head rcu;
115};
116
117static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
118{
119 if (qdisc->flags & TCQ_F_BUILTIN)
120 return;
121 refcount_inc(&qdisc->refcnt);
122}
123
124/* Intended to be used by unlocked users, when concurrent qdisc release is
125 * possible.
126 */
127
128static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
129{
130 if (qdisc->flags & TCQ_F_BUILTIN)
131 return qdisc;
132 if (refcount_inc_not_zero(&qdisc->refcnt))
133 return qdisc;
134 return NULL;
135}
136
137static inline bool qdisc_is_running(struct Qdisc *qdisc)
138{
139 if (qdisc->flags & TCQ_F_NOLOCK)
140 return spin_is_locked(&qdisc->seqlock);
141 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
142}
143
144static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
145{
146 return q->flags & TCQ_F_CPUSTATS;
147}
148
149static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
150{
151 if (qdisc_is_percpu_stats(qdisc))
152 return qdisc->empty;
153 return !qdisc->q.qlen;
154}
155
156static inline bool qdisc_run_begin(struct Qdisc *qdisc)
157{
158 if (qdisc->flags & TCQ_F_NOLOCK) {
159 if (!spin_trylock(&qdisc->seqlock))
160 return false;
161 qdisc->empty = false;
162 } else if (qdisc_is_running(qdisc)) {
163 return false;
164 }
165 /* Variant of write_seqcount_begin() telling lockdep a trylock
166 * was attempted.
167 */
168 raw_write_seqcount_begin(&qdisc->running);
169 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
170 return true;
171}
172
173static inline void qdisc_run_end(struct Qdisc *qdisc)
174{
175 write_seqcount_end(&qdisc->running);
176 if (qdisc->flags & TCQ_F_NOLOCK)
177 spin_unlock(&qdisc->seqlock);
178}
179
180static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
181{
182 return qdisc->flags & TCQ_F_ONETXQUEUE;
183}
184
185static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
186{
187#ifdef CONFIG_BQL
188 /* Non-BQL migrated drivers will return 0, too. */
189 return dql_avail(&txq->dql);
190#else
191 return 0;
192#endif
193}
194
195struct Qdisc_class_ops {
196 unsigned int flags;
197 /* Child qdisc manipulation */
198 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
199 int (*graft)(struct Qdisc *, unsigned long cl,
200 struct Qdisc *, struct Qdisc **,
201 struct netlink_ext_ack *extack);
202 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
203 void (*qlen_notify)(struct Qdisc *, unsigned long);
204
205 /* Class manipulation routines */
206 unsigned long (*find)(struct Qdisc *, u32 classid);
207 int (*change)(struct Qdisc *, u32, u32,
208 struct nlattr **, unsigned long *,
209 struct netlink_ext_ack *);
210 int (*delete)(struct Qdisc *, unsigned long);
211 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
212
213 /* Filter manipulation */
214 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
215 unsigned long arg,
216 struct netlink_ext_ack *extack);
217 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
218 u32 classid);
219 void (*unbind_tcf)(struct Qdisc *, unsigned long);
220
221 /* rtnetlink specific */
222 int (*dump)(struct Qdisc *, unsigned long,
223 struct sk_buff *skb, struct tcmsg*);
224 int (*dump_stats)(struct Qdisc *, unsigned long,
225 struct gnet_dump *);
226};
227
228/* Qdisc_class_ops flag values */
229
230/* Implements API that doesn't require rtnl lock */
231enum qdisc_class_ops_flags {
232 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
233};
234
235struct Qdisc_ops {
236 struct Qdisc_ops *next;
237 const struct Qdisc_class_ops *cl_ops;
238 char id[IFNAMSIZ];
239 int priv_size;
240 unsigned int static_flags;
241
242 int (*enqueue)(struct sk_buff *skb,
243 struct Qdisc *sch,
244 struct sk_buff **to_free);
245 struct sk_buff * (*dequeue)(struct Qdisc *);
246 struct sk_buff * (*peek)(struct Qdisc *);
247
248 int (*init)(struct Qdisc *sch, struct nlattr *arg,
249 struct netlink_ext_ack *extack);
250 void (*reset)(struct Qdisc *);
251 void (*destroy)(struct Qdisc *);
252 int (*change)(struct Qdisc *sch,
253 struct nlattr *arg,
254 struct netlink_ext_ack *extack);
255 void (*attach)(struct Qdisc *sch);
256 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
257
258 int (*dump)(struct Qdisc *, struct sk_buff *);
259 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
260
261 void (*ingress_block_set)(struct Qdisc *sch,
262 u32 block_index);
263 void (*egress_block_set)(struct Qdisc *sch,
264 u32 block_index);
265 u32 (*ingress_block_get)(struct Qdisc *sch);
266 u32 (*egress_block_get)(struct Qdisc *sch);
267
268 struct module *owner;
269};
270
271
272struct tcf_result {
273 union {
274 struct {
275 unsigned long class;
276 u32 classid;
277 };
278 const struct tcf_proto *goto_tp;
279
280 /* used in the skb_tc_reinsert function */
281 struct {
282 bool ingress;
283 struct gnet_stats_queue *qstats;
284 };
285 };
286};
287
288struct tcf_chain;
289
290struct tcf_proto_ops {
291 struct list_head head;
292 char kind[IFNAMSIZ];
293
294 int (*classify)(struct sk_buff *,
295 const struct tcf_proto *,
296 struct tcf_result *);
297 int (*init)(struct tcf_proto*);
298 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
299 struct netlink_ext_ack *extack);
300
301 void* (*get)(struct tcf_proto*, u32 handle);
302 void (*put)(struct tcf_proto *tp, void *f);
303 int (*change)(struct net *net, struct sk_buff *,
304 struct tcf_proto*, unsigned long,
305 u32 handle, struct nlattr **,
306 void **, bool, bool,
307 struct netlink_ext_ack *);
308 int (*delete)(struct tcf_proto *tp, void *arg,
309 bool *last, bool rtnl_held,
310 struct netlink_ext_ack *);
311 void (*walk)(struct tcf_proto *tp,
312 struct tcf_walker *arg, bool rtnl_held);
313 int (*reoffload)(struct tcf_proto *tp, bool add,
314 flow_setup_cb_t *cb, void *cb_priv,
315 struct netlink_ext_ack *extack);
316 void (*hw_add)(struct tcf_proto *tp,
317 void *type_data);
318 void (*hw_del)(struct tcf_proto *tp,
319 void *type_data);
320 void (*bind_class)(void *, u32, unsigned long);
321 void * (*tmplt_create)(struct net *net,
322 struct tcf_chain *chain,
323 struct nlattr **tca,
324 struct netlink_ext_ack *extack);
325 void (*tmplt_destroy)(void *tmplt_priv);
326
327 /* rtnetlink specific */
328 int (*dump)(struct net*, struct tcf_proto*, void *,
329 struct sk_buff *skb, struct tcmsg*,
330 bool);
331 int (*tmplt_dump)(struct sk_buff *skb,
332 struct net *net,
333 void *tmplt_priv);
334
335 struct module *owner;
336 int flags;
337};
338
339enum tcf_proto_ops_flags {
340 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
341};
342
343struct tcf_proto {
344 /* Fast access part */
345 struct tcf_proto __rcu *next;
346 void __rcu *root;
347
348 /* called under RCU BH lock*/
349 int (*classify)(struct sk_buff *,
350 const struct tcf_proto *,
351 struct tcf_result *);
352 __be16 protocol;
353
354 /* All the rest */
355 u32 prio;
356 void *data;
357 const struct tcf_proto_ops *ops;
358 struct tcf_chain *chain;
359 /* Lock protects tcf_proto shared state and can be used by unlocked
360 * classifiers to protect their private data.
361 */
362 spinlock_t lock;
363 bool deleting;
364 refcount_t refcnt;
365 struct rcu_head rcu;
366 struct hlist_node destroy_ht_node;
367};
368
369struct qdisc_skb_cb {
370 struct {
371 unsigned int pkt_len;
372 u16 slave_dev_queue_mapping;
373 u16 tc_classid;
374 };
375#define QDISC_CB_PRIV_LEN 20
376 unsigned char data[QDISC_CB_PRIV_LEN];
377};
378
379typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
380
381struct tcf_chain {
382 /* Protects filter_chain. */
383 struct mutex filter_chain_lock;
384 struct tcf_proto __rcu *filter_chain;
385 struct list_head list;
386 struct tcf_block *block;
387 u32 index; /* chain index */
388 unsigned int refcnt;
389 unsigned int action_refcnt;
390 bool explicitly_created;
391 bool flushing;
392 const struct tcf_proto_ops *tmplt_ops;
393 void *tmplt_priv;
394 struct rcu_head rcu;
395};
396
397struct tcf_block {
398 /* Lock protects tcf_block and lifetime-management data of chains
399 * attached to the block (refcnt, action_refcnt, explicitly_created).
400 */
401 struct mutex lock;
402 struct list_head chain_list;
403 u32 index; /* block index for shared blocks */
404 refcount_t refcnt;
405 struct net *net;
406 struct Qdisc *q;
407 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
408 struct flow_block flow_block;
409 struct list_head owner_list;
410 bool keep_dst;
411 atomic_t offloadcnt; /* Number of oddloaded filters */
412 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
413 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
414 struct {
415 struct tcf_chain *chain;
416 struct list_head filter_chain_list;
417 } chain0;
418 struct rcu_head rcu;
419 DECLARE_HASHTABLE(proto_destroy_ht, 7);
420 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
421};
422
423#ifdef CONFIG_PROVE_LOCKING
424static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
425{
426 return lockdep_is_held(&chain->filter_chain_lock);
427}
428
429static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
430{
431 return lockdep_is_held(&tp->lock);
432}
433#else
434static inline bool lockdep_tcf_chain_is_locked(struct tcf_block *chain)
435{
436 return true;
437}
438
439static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
440{
441 return true;
442}
443#endif /* #ifdef CONFIG_PROVE_LOCKING */
444
445#define tcf_chain_dereference(p, chain) \
446 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
447
448#define tcf_proto_dereference(p, tp) \
449 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
450
451static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
452{
453 struct qdisc_skb_cb *qcb;
454
455 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
456 BUILD_BUG_ON(sizeof(qcb->data) < sz);
457}
458
459static inline int qdisc_qlen_cpu(const struct Qdisc *q)
460{
461 return this_cpu_ptr(q->cpu_qstats)->qlen;
462}
463
464static inline int qdisc_qlen(const struct Qdisc *q)
465{
466 return q->q.qlen;
467}
468
469static inline int qdisc_qlen_sum(const struct Qdisc *q)
470{
471 __u32 qlen = q->qstats.qlen;
472 int i;
473
474 if (qdisc_is_percpu_stats(q)) {
475 for_each_possible_cpu(i)
476 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
477 } else {
478 qlen += q->q.qlen;
479 }
480
481 return qlen;
482}
483
484static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
485{
486 return (struct qdisc_skb_cb *)skb->cb;
487}
488
489static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
490{
491 return &qdisc->q.lock;
492}
493
494static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
495{
496 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
497
498 return q;
499}
500
501static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
502{
503 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
504}
505
506static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
507{
508 return qdisc->dev_queue->qdisc_sleeping;
509}
510
511/* The qdisc root lock is a mechanism by which to top level
512 * of a qdisc tree can be locked from any qdisc node in the
513 * forest. This allows changing the configuration of some
514 * aspect of the qdisc tree while blocking out asynchronous
515 * qdisc access in the packet processing paths.
516 *
517 * It is only legal to do this when the root will not change
518 * on us. Otherwise we'll potentially lock the wrong qdisc
519 * root. This is enforced by holding the RTNL semaphore, which
520 * all users of this lock accessor must do.
521 */
522static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
523{
524 struct Qdisc *root = qdisc_root(qdisc);
525
526 ASSERT_RTNL();
527 return qdisc_lock(root);
528}
529
530static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
531{
532 struct Qdisc *root = qdisc_root_sleeping(qdisc);
533
534 ASSERT_RTNL();
535 return qdisc_lock(root);
536}
537
538static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
539{
540 struct Qdisc *root = qdisc_root_sleeping(qdisc);
541
542 ASSERT_RTNL();
543 return &root->running;
544}
545
546static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
547{
548 return qdisc->dev_queue->dev;
549}
550
551static inline void sch_tree_lock(const struct Qdisc *q)
552{
553 spin_lock_bh(qdisc_root_sleeping_lock(q));
554}
555
556static inline void sch_tree_unlock(const struct Qdisc *q)
557{
558 spin_unlock_bh(qdisc_root_sleeping_lock(q));
559}
560
561extern struct Qdisc noop_qdisc;
562extern struct Qdisc_ops noop_qdisc_ops;
563extern struct Qdisc_ops pfifo_fast_ops;
564extern struct Qdisc_ops mq_qdisc_ops;
565extern struct Qdisc_ops noqueue_qdisc_ops;
566extern const struct Qdisc_ops *default_qdisc_ops;
567static inline const struct Qdisc_ops *
568get_default_qdisc_ops(const struct net_device *dev, int ntx)
569{
570 return ntx < dev->real_num_tx_queues ?
571 default_qdisc_ops : &pfifo_fast_ops;
572}
573
574struct Qdisc_class_common {
575 u32 classid;
576 struct hlist_node hnode;
577};
578
579struct Qdisc_class_hash {
580 struct hlist_head *hash;
581 unsigned int hashsize;
582 unsigned int hashmask;
583 unsigned int hashelems;
584};
585
586static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
587{
588 id ^= id >> 8;
589 id ^= id >> 4;
590 return id & mask;
591}
592
593static inline struct Qdisc_class_common *
594qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
595{
596 struct Qdisc_class_common *cl;
597 unsigned int h;
598
599 if (!id)
600 return NULL;
601
602 h = qdisc_class_hash(id, hash->hashmask);
603 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
604 if (cl->classid == id)
605 return cl;
606 }
607 return NULL;
608}
609
610static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
611{
612 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
613
614 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
615}
616
617int qdisc_class_hash_init(struct Qdisc_class_hash *);
618void qdisc_class_hash_insert(struct Qdisc_class_hash *,
619 struct Qdisc_class_common *);
620void qdisc_class_hash_remove(struct Qdisc_class_hash *,
621 struct Qdisc_class_common *);
622void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
623void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
624
625int dev_qdisc_change_tx_queue_len(struct net_device *dev);
626void dev_init_scheduler(struct net_device *dev);
627void dev_shutdown(struct net_device *dev);
628void dev_activate(struct net_device *dev);
629void dev_deactivate(struct net_device *dev);
630void dev_deactivate_many(struct list_head *head);
631struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
632 struct Qdisc *qdisc);
633void qdisc_reset(struct Qdisc *qdisc);
634void qdisc_put(struct Qdisc *qdisc);
635void qdisc_put_unlocked(struct Qdisc *qdisc);
636void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
637#ifdef CONFIG_NET_SCHED
638int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
639 void *type_data);
640void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
641 struct Qdisc *new, struct Qdisc *old,
642 enum tc_setup_type type, void *type_data,
643 struct netlink_ext_ack *extack);
644#else
645static inline int
646qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
647 void *type_data)
648{
649 q->flags &= ~TCQ_F_OFFLOADED;
650 return 0;
651}
652
653static inline void
654qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
655 struct Qdisc *new, struct Qdisc *old,
656 enum tc_setup_type type, void *type_data,
657 struct netlink_ext_ack *extack)
658{
659}
660#endif
661struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
662 const struct Qdisc_ops *ops,
663 struct netlink_ext_ack *extack);
664void qdisc_free(struct Qdisc *qdisc);
665struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
666 const struct Qdisc_ops *ops, u32 parentid,
667 struct netlink_ext_ack *extack);
668void __qdisc_calculate_pkt_len(struct sk_buff *skb,
669 const struct qdisc_size_table *stab);
670int skb_do_redirect(struct sk_buff *);
671
672static inline void skb_reset_tc(struct sk_buff *skb)
673{
674#ifdef CONFIG_NET_CLS_ACT
675 skb->tc_redirected = 0;
676#endif
677}
678
679static inline bool skb_is_tc_redirected(const struct sk_buff *skb)
680{
681#ifdef CONFIG_NET_CLS_ACT
682 return skb->tc_redirected;
683#else
684 return false;
685#endif
686}
687
688static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
689{
690#ifdef CONFIG_NET_CLS_ACT
691 return skb->tc_at_ingress;
692#else
693 return false;
694#endif
695}
696
697static inline bool skb_skip_tc_classify(struct sk_buff *skb)
698{
699#ifdef CONFIG_NET_CLS_ACT
700 if (skb->tc_skip_classify) {
701 skb->tc_skip_classify = 0;
702 return true;
703 }
704#endif
705 return false;
706}
707
708/* Reset all TX qdiscs greater than index of a device. */
709static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
710{
711 struct Qdisc *qdisc;
712
713 for (; i < dev->num_tx_queues; i++) {
714 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
715 if (qdisc) {
716 spin_lock_bh(qdisc_lock(qdisc));
717 qdisc_reset(qdisc);
718 spin_unlock_bh(qdisc_lock(qdisc));
719 }
720 }
721}
722
723static inline void qdisc_reset_all_tx(struct net_device *dev)
724{
725 qdisc_reset_all_tx_gt(dev, 0);
726}
727
728/* Are all TX queues of the device empty? */
729static inline bool qdisc_all_tx_empty(const struct net_device *dev)
730{
731 unsigned int i;
732
733 rcu_read_lock();
734 for (i = 0; i < dev->num_tx_queues; i++) {
735 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
736 const struct Qdisc *q = rcu_dereference(txq->qdisc);
737
738 if (!qdisc_is_empty(q)) {
739 rcu_read_unlock();
740 return false;
741 }
742 }
743 rcu_read_unlock();
744 return true;
745}
746
747/* Are any of the TX qdiscs changing? */
748static inline bool qdisc_tx_changing(const struct net_device *dev)
749{
750 unsigned int i;
751
752 for (i = 0; i < dev->num_tx_queues; i++) {
753 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
754 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
755 return true;
756 }
757 return false;
758}
759
760/* Is the device using the noop qdisc on all queues? */
761static inline bool qdisc_tx_is_noop(const struct net_device *dev)
762{
763 unsigned int i;
764
765 for (i = 0; i < dev->num_tx_queues; i++) {
766 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
767 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
768 return false;
769 }
770 return true;
771}
772
773static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
774{
775 return qdisc_skb_cb(skb)->pkt_len;
776}
777
778/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
779enum net_xmit_qdisc_t {
780 __NET_XMIT_STOLEN = 0x00010000,
781 __NET_XMIT_BYPASS = 0x00020000,
782};
783
784#ifdef CONFIG_NET_CLS_ACT
785#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
786#else
787#define net_xmit_drop_count(e) (1)
788#endif
789
790static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
791 const struct Qdisc *sch)
792{
793#ifdef CONFIG_NET_SCHED
794 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
795
796 if (stab)
797 __qdisc_calculate_pkt_len(skb, stab);
798#endif
799}
800
801static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
802 struct sk_buff **to_free)
803{
804 qdisc_calculate_pkt_len(skb, sch);
805 return sch->enqueue(skb, sch, to_free);
806}
807
808static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
809 __u64 bytes, __u32 packets)
810{
811 bstats->bytes += bytes;
812 bstats->packets += packets;
813}
814
815static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
816 const struct sk_buff *skb)
817{
818 _bstats_update(bstats,
819 qdisc_pkt_len(skb),
820 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
821}
822
823static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
824 __u64 bytes, __u32 packets)
825{
826 u64_stats_update_begin(&bstats->syncp);
827 _bstats_update(&bstats->bstats, bytes, packets);
828 u64_stats_update_end(&bstats->syncp);
829}
830
831static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
832 const struct sk_buff *skb)
833{
834 u64_stats_update_begin(&bstats->syncp);
835 bstats_update(&bstats->bstats, skb);
836 u64_stats_update_end(&bstats->syncp);
837}
838
839static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
840 const struct sk_buff *skb)
841{
842 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
843}
844
845static inline void qdisc_bstats_update(struct Qdisc *sch,
846 const struct sk_buff *skb)
847{
848 bstats_update(&sch->bstats, skb);
849}
850
851static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
852 const struct sk_buff *skb)
853{
854 sch->qstats.backlog -= qdisc_pkt_len(skb);
855}
856
857static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
858 const struct sk_buff *skb)
859{
860 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
861}
862
863static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
864 const struct sk_buff *skb)
865{
866 sch->qstats.backlog += qdisc_pkt_len(skb);
867}
868
869static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
870 const struct sk_buff *skb)
871{
872 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
873}
874
875static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
876{
877 this_cpu_inc(sch->cpu_qstats->qlen);
878}
879
880static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
881{
882 this_cpu_dec(sch->cpu_qstats->qlen);
883}
884
885static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
886{
887 this_cpu_inc(sch->cpu_qstats->requeues);
888}
889
890static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
891{
892 sch->qstats.drops += count;
893}
894
895static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
896{
897 qstats->drops++;
898}
899
900static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
901{
902 qstats->overlimits++;
903}
904
905static inline void qdisc_qstats_drop(struct Qdisc *sch)
906{
907 qstats_drop_inc(&sch->qstats);
908}
909
910static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
911{
912 this_cpu_inc(sch->cpu_qstats->drops);
913}
914
915static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
916{
917 sch->qstats.overlimits++;
918}
919
920static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
921{
922 __u32 qlen = qdisc_qlen_sum(sch);
923
924 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
925}
926
927static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
928 __u32 *backlog)
929{
930 struct gnet_stats_queue qstats = { 0 };
931 __u32 len = qdisc_qlen_sum(sch);
932
933 __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
934 *qlen = qstats.qlen;
935 *backlog = qstats.backlog;
936}
937
938static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
939{
940 __u32 qlen, backlog;
941
942 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
943 qdisc_tree_reduce_backlog(sch, qlen, backlog);
944}
945
946static inline void qdisc_purge_queue(struct Qdisc *sch)
947{
948 __u32 qlen, backlog;
949
950 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
951 qdisc_reset(sch);
952 qdisc_tree_reduce_backlog(sch, qlen, backlog);
953}
954
955static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
956{
957 qh->head = NULL;
958 qh->tail = NULL;
959 qh->qlen = 0;
960}
961
962static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
963 struct qdisc_skb_head *qh)
964{
965 struct sk_buff *last = qh->tail;
966
967 if (last) {
968 skb->next = NULL;
969 last->next = skb;
970 qh->tail = skb;
971 } else {
972 qh->tail = skb;
973 qh->head = skb;
974 }
975 qh->qlen++;
976}
977
978static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
979{
980 __qdisc_enqueue_tail(skb, &sch->q);
981 qdisc_qstats_backlog_inc(sch, skb);
982 return NET_XMIT_SUCCESS;
983}
984
985static inline void __qdisc_enqueue_head(struct sk_buff *skb,
986 struct qdisc_skb_head *qh)
987{
988 skb->next = qh->head;
989
990 if (!qh->head)
991 qh->tail = skb;
992 qh->head = skb;
993 qh->qlen++;
994}
995
996static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
997{
998 struct sk_buff *skb = qh->head;
999
1000 if (likely(skb != NULL)) {
1001 qh->head = skb->next;
1002 qh->qlen--;
1003 if (qh->head == NULL)
1004 qh->tail = NULL;
1005 skb->next = NULL;
1006 }
1007
1008 return skb;
1009}
1010
1011static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1012{
1013 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1014
1015 if (likely(skb != NULL)) {
1016 qdisc_qstats_backlog_dec(sch, skb);
1017 qdisc_bstats_update(sch, skb);
1018 }
1019
1020 return skb;
1021}
1022
1023/* Instead of calling kfree_skb() while root qdisc lock is held,
1024 * queue the skb for future freeing at end of __dev_xmit_skb()
1025 */
1026static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1027{
1028 skb->next = *to_free;
1029 *to_free = skb;
1030}
1031
1032static inline void __qdisc_drop_all(struct sk_buff *skb,
1033 struct sk_buff **to_free)
1034{
1035 if (skb->prev)
1036 skb->prev->next = *to_free;
1037 else
1038 skb->next = *to_free;
1039 *to_free = skb;
1040}
1041
1042static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1043 struct qdisc_skb_head *qh,
1044 struct sk_buff **to_free)
1045{
1046 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1047
1048 if (likely(skb != NULL)) {
1049 unsigned int len = qdisc_pkt_len(skb);
1050
1051 qdisc_qstats_backlog_dec(sch, skb);
1052 __qdisc_drop(skb, to_free);
1053 return len;
1054 }
1055
1056 return 0;
1057}
1058
1059static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
1060 struct sk_buff **to_free)
1061{
1062 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
1063}
1064
1065static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1066{
1067 const struct qdisc_skb_head *qh = &sch->q;
1068
1069 return qh->head;
1070}
1071
1072/* generic pseudo peek method for non-work-conserving qdisc */
1073static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1074{
1075 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1076
1077 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1078 if (!skb) {
1079 skb = sch->dequeue(sch);
1080
1081 if (skb) {
1082 __skb_queue_head(&sch->gso_skb, skb);
1083 /* it's still part of the queue */
1084 qdisc_qstats_backlog_inc(sch, skb);
1085 sch->q.qlen++;
1086 }
1087 }
1088
1089 return skb;
1090}
1091
1092static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1093 struct sk_buff *skb)
1094{
1095 if (qdisc_is_percpu_stats(sch)) {
1096 qdisc_qstats_cpu_backlog_dec(sch, skb);
1097 qdisc_bstats_cpu_update(sch, skb);
1098 qdisc_qstats_cpu_qlen_dec(sch);
1099 } else {
1100 qdisc_qstats_backlog_dec(sch, skb);
1101 qdisc_bstats_update(sch, skb);
1102 sch->q.qlen--;
1103 }
1104}
1105
1106static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1107 unsigned int pkt_len)
1108{
1109 if (qdisc_is_percpu_stats(sch)) {
1110 qdisc_qstats_cpu_qlen_inc(sch);
1111 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1112 } else {
1113 sch->qstats.backlog += pkt_len;
1114 sch->q.qlen++;
1115 }
1116}
1117
1118/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1119static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1120{
1121 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1122
1123 if (skb) {
1124 skb = __skb_dequeue(&sch->gso_skb);
1125 if (qdisc_is_percpu_stats(sch)) {
1126 qdisc_qstats_cpu_backlog_dec(sch, skb);
1127 qdisc_qstats_cpu_qlen_dec(sch);
1128 } else {
1129 qdisc_qstats_backlog_dec(sch, skb);
1130 sch->q.qlen--;
1131 }
1132 } else {
1133 skb = sch->dequeue(sch);
1134 }
1135
1136 return skb;
1137}
1138
1139static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1140{
1141 /*
1142 * We do not know the backlog in bytes of this list, it
1143 * is up to the caller to correct it
1144 */
1145 ASSERT_RTNL();
1146 if (qh->qlen) {
1147 rtnl_kfree_skbs(qh->head, qh->tail);
1148
1149 qh->head = NULL;
1150 qh->tail = NULL;
1151 qh->qlen = 0;
1152 }
1153}
1154
1155static inline void qdisc_reset_queue(struct Qdisc *sch)
1156{
1157 __qdisc_reset_queue(&sch->q);
1158 sch->qstats.backlog = 0;
1159}
1160
1161static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1162 struct Qdisc **pold)
1163{
1164 struct Qdisc *old;
1165
1166 sch_tree_lock(sch);
1167 old = *pold;
1168 *pold = new;
1169 if (old != NULL)
1170 qdisc_tree_flush_backlog(old);
1171 sch_tree_unlock(sch);
1172
1173 return old;
1174}
1175
1176static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1177{
1178 rtnl_kfree_skbs(skb, skb);
1179 qdisc_qstats_drop(sch);
1180}
1181
1182static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1183 struct sk_buff **to_free)
1184{
1185 __qdisc_drop(skb, to_free);
1186 qdisc_qstats_cpu_drop(sch);
1187
1188 return NET_XMIT_DROP;
1189}
1190
1191static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1192 struct sk_buff **to_free)
1193{
1194 __qdisc_drop(skb, to_free);
1195 qdisc_qstats_drop(sch);
1196
1197 return NET_XMIT_DROP;
1198}
1199
1200static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1201 struct sk_buff **to_free)
1202{
1203 __qdisc_drop_all(skb, to_free);
1204 qdisc_qstats_drop(sch);
1205
1206 return NET_XMIT_DROP;
1207}
1208
1209/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1210 long it will take to send a packet given its size.
1211 */
1212static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1213{
1214 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1215 if (slot < 0)
1216 slot = 0;
1217 slot >>= rtab->rate.cell_log;
1218 if (slot > 255)
1219 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1220 return rtab->data[slot];
1221}
1222
1223struct psched_ratecfg {
1224 u64 rate_bytes_ps; /* bytes per second */
1225 u32 mult;
1226 u16 overhead;
1227 u8 linklayer;
1228 u8 shift;
1229};
1230
1231static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1232 unsigned int len)
1233{
1234 len += r->overhead;
1235
1236 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1237 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1238
1239 return ((u64)len * r->mult) >> r->shift;
1240}
1241
1242void psched_ratecfg_precompute(struct psched_ratecfg *r,
1243 const struct tc_ratespec *conf,
1244 u64 rate64);
1245
1246static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1247 const struct psched_ratecfg *r)
1248{
1249 memset(res, 0, sizeof(*res));
1250
1251 /* legacy struct tc_ratespec has a 32bit @rate field
1252 * Qdisc using 64bit rate should add new attributes
1253 * in order to maintain compatibility.
1254 */
1255 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1256
1257 res->overhead = r->overhead;
1258 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1259}
1260
1261/* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1262 * The fast path only needs to access filter list and to update stats
1263 */
1264struct mini_Qdisc {
1265 struct tcf_proto *filter_list;
1266 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1267 struct gnet_stats_queue __percpu *cpu_qstats;
1268 struct rcu_head rcu;
1269};
1270
1271static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1272 const struct sk_buff *skb)
1273{
1274 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1275}
1276
1277static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1278{
1279 this_cpu_inc(miniq->cpu_qstats->drops);
1280}
1281
1282struct mini_Qdisc_pair {
1283 struct mini_Qdisc miniq1;
1284 struct mini_Qdisc miniq2;
1285 struct mini_Qdisc __rcu **p_miniq;
1286};
1287
1288void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1289 struct tcf_proto *tp_head);
1290void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1291 struct mini_Qdisc __rcu **p_miniq);
1292
1293static inline void skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res)
1294{
1295 struct gnet_stats_queue *stats = res->qstats;
1296 int ret;
1297
1298 if (res->ingress)
1299 ret = netif_receive_skb(skb);
1300 else
1301 ret = dev_queue_xmit(skb);
1302 if (ret && stats)
1303 qstats_overlimit_inc(res->qstats);
1304}
1305
1306#endif