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Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetoot...
[linux-block.git] / include / net / sch_generic.h
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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};
34
35struct qdisc_size_table {
36 struct rcu_head rcu;
37 struct list_head list;
38 struct tc_sizespec szopts;
39 int refcnt;
40 u16 data[];
41};
42
43/* similar to sk_buff_head, but skb->prev pointer is undefined. */
44struct qdisc_skb_head {
45 struct sk_buff *head;
46 struct sk_buff *tail;
47 __u32 qlen;
48 spinlock_t lock;
49};
50
51struct Qdisc {
52 int (*enqueue)(struct sk_buff *skb,
53 struct Qdisc *sch,
54 struct sk_buff **to_free);
55 struct sk_buff * (*dequeue)(struct Qdisc *sch);
56 unsigned int flags;
57#define TCQ_F_BUILTIN 1
58#define TCQ_F_INGRESS 2
59#define TCQ_F_CAN_BYPASS 4
60#define TCQ_F_MQROOT 8
61#define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
62 * q->dev_queue : It can test
63 * netif_xmit_frozen_or_stopped() before
64 * dequeueing next packet.
65 * Its true for MQ/MQPRIO slaves, or non
66 * multiqueue device.
67 */
68#define TCQ_F_WARN_NONWC (1 << 16)
69#define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
70#define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
71 * qdisc_tree_decrease_qlen() should stop.
72 */
73#define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
74#define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
75#define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
76 u32 limit;
77 const struct Qdisc_ops *ops;
78 struct qdisc_size_table __rcu *stab;
79 struct hlist_node hash;
80 u32 handle;
81 u32 parent;
82
83 struct netdev_queue *dev_queue;
84
85 struct net_rate_estimator __rcu *rate_est;
86 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
87 struct gnet_stats_queue __percpu *cpu_qstats;
88
89 /*
90 * For performance sake on SMP, we put highly modified fields at the end
91 */
92 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
93 struct qdisc_skb_head q;
94 struct gnet_stats_basic_packed bstats;
95 seqcount_t running;
96 struct gnet_stats_queue qstats;
97 unsigned long state;
98 struct Qdisc *next_sched;
99 struct sk_buff_head skb_bad_txq;
100 int padded;
101 refcount_t refcnt;
102
103 spinlock_t busylock ____cacheline_aligned_in_smp;
104};
105
106static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
107{
108 if (qdisc->flags & TCQ_F_BUILTIN)
109 return;
110 refcount_inc(&qdisc->refcnt);
111}
112
113static inline bool qdisc_is_running(const struct Qdisc *qdisc)
114{
115 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
116}
117
118static inline bool qdisc_run_begin(struct Qdisc *qdisc)
119{
120 if (qdisc_is_running(qdisc))
121 return false;
122 /* Variant of write_seqcount_begin() telling lockdep a trylock
123 * was attempted.
124 */
125 raw_write_seqcount_begin(&qdisc->running);
126 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
127 return true;
128}
129
130static inline void qdisc_run_end(struct Qdisc *qdisc)
131{
132 write_seqcount_end(&qdisc->running);
133}
134
135static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
136{
137 return qdisc->flags & TCQ_F_ONETXQUEUE;
138}
139
140static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
141{
142#ifdef CONFIG_BQL
143 /* Non-BQL migrated drivers will return 0, too. */
144 return dql_avail(&txq->dql);
145#else
146 return 0;
147#endif
148}
149
150struct Qdisc_class_ops {
151 /* Child qdisc manipulation */
152 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
153 int (*graft)(struct Qdisc *, unsigned long cl,
154 struct Qdisc *, struct Qdisc **,
155 struct netlink_ext_ack *extack);
156 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
157 void (*qlen_notify)(struct Qdisc *, unsigned long);
158
159 /* Class manipulation routines */
160 unsigned long (*find)(struct Qdisc *, u32 classid);
161 int (*change)(struct Qdisc *, u32, u32,
162 struct nlattr **, unsigned long *,
163 struct netlink_ext_ack *);
164 int (*delete)(struct Qdisc *, unsigned long);
165 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
166
167 /* Filter manipulation */
168 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
169 unsigned long arg,
170 struct netlink_ext_ack *extack);
171 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
172 u32 classid);
173 void (*unbind_tcf)(struct Qdisc *, unsigned long);
174
175 /* rtnetlink specific */
176 int (*dump)(struct Qdisc *, unsigned long,
177 struct sk_buff *skb, struct tcmsg*);
178 int (*dump_stats)(struct Qdisc *, unsigned long,
179 struct gnet_dump *);
180};
181
182struct Qdisc_ops {
183 struct Qdisc_ops *next;
184 const struct Qdisc_class_ops *cl_ops;
185 char id[IFNAMSIZ];
186 int priv_size;
187 unsigned int static_flags;
188
189 int (*enqueue)(struct sk_buff *skb,
190 struct Qdisc *sch,
191 struct sk_buff **to_free);
192 struct sk_buff * (*dequeue)(struct Qdisc *);
193 struct sk_buff * (*peek)(struct Qdisc *);
194
195 int (*init)(struct Qdisc *sch, struct nlattr *arg,
196 struct netlink_ext_ack *extack);
197 void (*reset)(struct Qdisc *);
198 void (*destroy)(struct Qdisc *);
199 int (*change)(struct Qdisc *sch,
200 struct nlattr *arg,
201 struct netlink_ext_ack *extack);
202 void (*attach)(struct Qdisc *sch);
203 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
204
205 int (*dump)(struct Qdisc *, struct sk_buff *);
206 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
207
208 void (*ingress_block_set)(struct Qdisc *sch,
209 u32 block_index);
210 void (*egress_block_set)(struct Qdisc *sch,
211 u32 block_index);
212 u32 (*ingress_block_get)(struct Qdisc *sch);
213 u32 (*egress_block_get)(struct Qdisc *sch);
214
215 struct module *owner;
216};
217
218
219struct tcf_result {
220 union {
221 struct {
222 unsigned long class;
223 u32 classid;
224 };
225 const struct tcf_proto *goto_tp;
226 };
227};
228
229struct tcf_proto_ops {
230 struct list_head head;
231 char kind[IFNAMSIZ];
232
233 int (*classify)(struct sk_buff *,
234 const struct tcf_proto *,
235 struct tcf_result *);
236 int (*init)(struct tcf_proto*);
237 void (*destroy)(struct tcf_proto *tp,
238 struct netlink_ext_ack *extack);
239
240 void* (*get)(struct tcf_proto*, u32 handle);
241 int (*change)(struct net *net, struct sk_buff *,
242 struct tcf_proto*, unsigned long,
243 u32 handle, struct nlattr **,
244 void **, bool,
245 struct netlink_ext_ack *);
246 int (*delete)(struct tcf_proto *tp, void *arg,
247 bool *last,
248 struct netlink_ext_ack *);
249 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
250 void (*bind_class)(void *, u32, unsigned long);
251
252 /* rtnetlink specific */
253 int (*dump)(struct net*, struct tcf_proto*, void *,
254 struct sk_buff *skb, struct tcmsg*);
255
256 struct module *owner;
257};
258
259struct tcf_proto {
260 /* Fast access part */
261 struct tcf_proto __rcu *next;
262 void __rcu *root;
263 int (*classify)(struct sk_buff *,
264 const struct tcf_proto *,
265 struct tcf_result *);
266 __be16 protocol;
267
268 /* All the rest */
269 u32 prio;
270 void *data;
271 const struct tcf_proto_ops *ops;
272 struct tcf_chain *chain;
273 struct rcu_head rcu;
274};
275
276struct qdisc_skb_cb {
277 unsigned int pkt_len;
278 u16 slave_dev_queue_mapping;
279 u16 tc_classid;
280#define QDISC_CB_PRIV_LEN 20
281 unsigned char data[QDISC_CB_PRIV_LEN];
282};
283
284typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
285
286struct tcf_chain {
287 struct tcf_proto __rcu *filter_chain;
288 struct list_head filter_chain_list;
289 struct list_head list;
290 struct tcf_block *block;
291 u32 index; /* chain index */
292 unsigned int refcnt;
293};
294
295struct tcf_block {
296 struct list_head chain_list;
297 u32 index; /* block index for shared blocks */
298 unsigned int refcnt;
299 struct net *net;
300 struct Qdisc *q;
301 struct list_head cb_list;
302 struct list_head owner_list;
303 bool keep_dst;
304 unsigned int offloadcnt; /* Number of oddloaded filters */
305 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
306};
307
308static inline void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
309{
310 if (*flags & TCA_CLS_FLAGS_IN_HW)
311 return;
312 *flags |= TCA_CLS_FLAGS_IN_HW;
313 block->offloadcnt++;
314}
315
316static inline void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
317{
318 if (!(*flags & TCA_CLS_FLAGS_IN_HW))
319 return;
320 *flags &= ~TCA_CLS_FLAGS_IN_HW;
321 block->offloadcnt--;
322}
323
324static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
325{
326 struct qdisc_skb_cb *qcb;
327
328 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
329 BUILD_BUG_ON(sizeof(qcb->data) < sz);
330}
331
332static inline int qdisc_qlen_cpu(const struct Qdisc *q)
333{
334 return this_cpu_ptr(q->cpu_qstats)->qlen;
335}
336
337static inline int qdisc_qlen(const struct Qdisc *q)
338{
339 return q->q.qlen;
340}
341
342static inline int qdisc_qlen_sum(const struct Qdisc *q)
343{
344 __u32 qlen = 0;
345 int i;
346
347 if (q->flags & TCQ_F_NOLOCK) {
348 for_each_possible_cpu(i)
349 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
350 } else {
351 qlen = q->q.qlen;
352 }
353
354 return qlen;
355}
356
357static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
358{
359 return (struct qdisc_skb_cb *)skb->cb;
360}
361
362static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
363{
364 return &qdisc->q.lock;
365}
366
367static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
368{
369 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
370
371 return q;
372}
373
374static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
375{
376 return qdisc->dev_queue->qdisc_sleeping;
377}
378
379/* The qdisc root lock is a mechanism by which to top level
380 * of a qdisc tree can be locked from any qdisc node in the
381 * forest. This allows changing the configuration of some
382 * aspect of the qdisc tree while blocking out asynchronous
383 * qdisc access in the packet processing paths.
384 *
385 * It is only legal to do this when the root will not change
386 * on us. Otherwise we'll potentially lock the wrong qdisc
387 * root. This is enforced by holding the RTNL semaphore, which
388 * all users of this lock accessor must do.
389 */
390static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
391{
392 struct Qdisc *root = qdisc_root(qdisc);
393
394 ASSERT_RTNL();
395 return qdisc_lock(root);
396}
397
398static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
399{
400 struct Qdisc *root = qdisc_root_sleeping(qdisc);
401
402 ASSERT_RTNL();
403 return qdisc_lock(root);
404}
405
406static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
407{
408 struct Qdisc *root = qdisc_root_sleeping(qdisc);
409
410 ASSERT_RTNL();
411 return &root->running;
412}
413
414static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
415{
416 return qdisc->dev_queue->dev;
417}
418
419static inline void sch_tree_lock(const struct Qdisc *q)
420{
421 spin_lock_bh(qdisc_root_sleeping_lock(q));
422}
423
424static inline void sch_tree_unlock(const struct Qdisc *q)
425{
426 spin_unlock_bh(qdisc_root_sleeping_lock(q));
427}
428
429extern struct Qdisc noop_qdisc;
430extern struct Qdisc_ops noop_qdisc_ops;
431extern struct Qdisc_ops pfifo_fast_ops;
432extern struct Qdisc_ops mq_qdisc_ops;
433extern struct Qdisc_ops noqueue_qdisc_ops;
434extern const struct Qdisc_ops *default_qdisc_ops;
435static inline const struct Qdisc_ops *
436get_default_qdisc_ops(const struct net_device *dev, int ntx)
437{
438 return ntx < dev->real_num_tx_queues ?
439 default_qdisc_ops : &pfifo_fast_ops;
440}
441
442struct Qdisc_class_common {
443 u32 classid;
444 struct hlist_node hnode;
445};
446
447struct Qdisc_class_hash {
448 struct hlist_head *hash;
449 unsigned int hashsize;
450 unsigned int hashmask;
451 unsigned int hashelems;
452};
453
454static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
455{
456 id ^= id >> 8;
457 id ^= id >> 4;
458 return id & mask;
459}
460
461static inline struct Qdisc_class_common *
462qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
463{
464 struct Qdisc_class_common *cl;
465 unsigned int h;
466
467 if (!id)
468 return NULL;
469
470 h = qdisc_class_hash(id, hash->hashmask);
471 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
472 if (cl->classid == id)
473 return cl;
474 }
475 return NULL;
476}
477
478static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
479{
480 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
481
482 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
483}
484
485int qdisc_class_hash_init(struct Qdisc_class_hash *);
486void qdisc_class_hash_insert(struct Qdisc_class_hash *,
487 struct Qdisc_class_common *);
488void qdisc_class_hash_remove(struct Qdisc_class_hash *,
489 struct Qdisc_class_common *);
490void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
491void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
492
493int dev_qdisc_change_tx_queue_len(struct net_device *dev);
494void dev_init_scheduler(struct net_device *dev);
495void dev_shutdown(struct net_device *dev);
496void dev_activate(struct net_device *dev);
497void dev_deactivate(struct net_device *dev);
498void dev_deactivate_many(struct list_head *head);
499struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
500 struct Qdisc *qdisc);
501void qdisc_reset(struct Qdisc *qdisc);
502void qdisc_destroy(struct Qdisc *qdisc);
503void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
504 unsigned int len);
505struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
506 const struct Qdisc_ops *ops,
507 struct netlink_ext_ack *extack);
508void qdisc_free(struct Qdisc *qdisc);
509struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
510 const struct Qdisc_ops *ops, u32 parentid,
511 struct netlink_ext_ack *extack);
512void __qdisc_calculate_pkt_len(struct sk_buff *skb,
513 const struct qdisc_size_table *stab);
514int skb_do_redirect(struct sk_buff *);
515
516static inline void skb_reset_tc(struct sk_buff *skb)
517{
518#ifdef CONFIG_NET_CLS_ACT
519 skb->tc_redirected = 0;
520#endif
521}
522
523static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
524{
525#ifdef CONFIG_NET_CLS_ACT
526 return skb->tc_at_ingress;
527#else
528 return false;
529#endif
530}
531
532static inline bool skb_skip_tc_classify(struct sk_buff *skb)
533{
534#ifdef CONFIG_NET_CLS_ACT
535 if (skb->tc_skip_classify) {
536 skb->tc_skip_classify = 0;
537 return true;
538 }
539#endif
540 return false;
541}
542
543/* Reset all TX qdiscs greater then index of a device. */
544static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
545{
546 struct Qdisc *qdisc;
547
548 for (; i < dev->num_tx_queues; i++) {
549 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
550 if (qdisc) {
551 spin_lock_bh(qdisc_lock(qdisc));
552 qdisc_reset(qdisc);
553 spin_unlock_bh(qdisc_lock(qdisc));
554 }
555 }
556}
557
558static inline void qdisc_reset_all_tx(struct net_device *dev)
559{
560 qdisc_reset_all_tx_gt(dev, 0);
561}
562
563/* Are all TX queues of the device empty? */
564static inline bool qdisc_all_tx_empty(const struct net_device *dev)
565{
566 unsigned int i;
567
568 rcu_read_lock();
569 for (i = 0; i < dev->num_tx_queues; i++) {
570 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
571 const struct Qdisc *q = rcu_dereference(txq->qdisc);
572
573 if (q->q.qlen) {
574 rcu_read_unlock();
575 return false;
576 }
577 }
578 rcu_read_unlock();
579 return true;
580}
581
582/* Are any of the TX qdiscs changing? */
583static inline bool qdisc_tx_changing(const struct net_device *dev)
584{
585 unsigned int i;
586
587 for (i = 0; i < dev->num_tx_queues; i++) {
588 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
589 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
590 return true;
591 }
592 return false;
593}
594
595/* Is the device using the noop qdisc on all queues? */
596static inline bool qdisc_tx_is_noop(const struct net_device *dev)
597{
598 unsigned int i;
599
600 for (i = 0; i < dev->num_tx_queues; i++) {
601 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
602 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
603 return false;
604 }
605 return true;
606}
607
608static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
609{
610 return qdisc_skb_cb(skb)->pkt_len;
611}
612
613/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
614enum net_xmit_qdisc_t {
615 __NET_XMIT_STOLEN = 0x00010000,
616 __NET_XMIT_BYPASS = 0x00020000,
617};
618
619#ifdef CONFIG_NET_CLS_ACT
620#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
621#else
622#define net_xmit_drop_count(e) (1)
623#endif
624
625static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
626 const struct Qdisc *sch)
627{
628#ifdef CONFIG_NET_SCHED
629 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
630
631 if (stab)
632 __qdisc_calculate_pkt_len(skb, stab);
633#endif
634}
635
636static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
637 struct sk_buff **to_free)
638{
639 qdisc_calculate_pkt_len(skb, sch);
640 return sch->enqueue(skb, sch, to_free);
641}
642
643static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
644{
645 return q->flags & TCQ_F_CPUSTATS;
646}
647
648static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
649 __u64 bytes, __u32 packets)
650{
651 bstats->bytes += bytes;
652 bstats->packets += packets;
653}
654
655static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
656 const struct sk_buff *skb)
657{
658 _bstats_update(bstats,
659 qdisc_pkt_len(skb),
660 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
661}
662
663static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
664 __u64 bytes, __u32 packets)
665{
666 u64_stats_update_begin(&bstats->syncp);
667 _bstats_update(&bstats->bstats, bytes, packets);
668 u64_stats_update_end(&bstats->syncp);
669}
670
671static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
672 const struct sk_buff *skb)
673{
674 u64_stats_update_begin(&bstats->syncp);
675 bstats_update(&bstats->bstats, skb);
676 u64_stats_update_end(&bstats->syncp);
677}
678
679static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
680 const struct sk_buff *skb)
681{
682 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
683}
684
685static inline void qdisc_bstats_update(struct Qdisc *sch,
686 const struct sk_buff *skb)
687{
688 bstats_update(&sch->bstats, skb);
689}
690
691static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
692 const struct sk_buff *skb)
693{
694 sch->qstats.backlog -= qdisc_pkt_len(skb);
695}
696
697static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
698 const struct sk_buff *skb)
699{
700 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
701}
702
703static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
704 const struct sk_buff *skb)
705{
706 sch->qstats.backlog += qdisc_pkt_len(skb);
707}
708
709static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
710 const struct sk_buff *skb)
711{
712 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
713}
714
715static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
716{
717 this_cpu_inc(sch->cpu_qstats->qlen);
718}
719
720static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
721{
722 this_cpu_dec(sch->cpu_qstats->qlen);
723}
724
725static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
726{
727 this_cpu_inc(sch->cpu_qstats->requeues);
728}
729
730static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
731{
732 sch->qstats.drops += count;
733}
734
735static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
736{
737 qstats->drops++;
738}
739
740static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
741{
742 qstats->overlimits++;
743}
744
745static inline void qdisc_qstats_drop(struct Qdisc *sch)
746{
747 qstats_drop_inc(&sch->qstats);
748}
749
750static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
751{
752 this_cpu_inc(sch->cpu_qstats->drops);
753}
754
755static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
756{
757 sch->qstats.overlimits++;
758}
759
760static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
761{
762 qh->head = NULL;
763 qh->tail = NULL;
764 qh->qlen = 0;
765}
766
767static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
768 struct qdisc_skb_head *qh)
769{
770 struct sk_buff *last = qh->tail;
771
772 if (last) {
773 skb->next = NULL;
774 last->next = skb;
775 qh->tail = skb;
776 } else {
777 qh->tail = skb;
778 qh->head = skb;
779 }
780 qh->qlen++;
781 qdisc_qstats_backlog_inc(sch, skb);
782
783 return NET_XMIT_SUCCESS;
784}
785
786static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
787{
788 return __qdisc_enqueue_tail(skb, sch, &sch->q);
789}
790
791static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
792{
793 struct sk_buff *skb = qh->head;
794
795 if (likely(skb != NULL)) {
796 qh->head = skb->next;
797 qh->qlen--;
798 if (qh->head == NULL)
799 qh->tail = NULL;
800 skb->next = NULL;
801 }
802
803 return skb;
804}
805
806static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
807{
808 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
809
810 if (likely(skb != NULL)) {
811 qdisc_qstats_backlog_dec(sch, skb);
812 qdisc_bstats_update(sch, skb);
813 }
814
815 return skb;
816}
817
818/* Instead of calling kfree_skb() while root qdisc lock is held,
819 * queue the skb for future freeing at end of __dev_xmit_skb()
820 */
821static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
822{
823 skb->next = *to_free;
824 *to_free = skb;
825}
826
827static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
828 struct qdisc_skb_head *qh,
829 struct sk_buff **to_free)
830{
831 struct sk_buff *skb = __qdisc_dequeue_head(qh);
832
833 if (likely(skb != NULL)) {
834 unsigned int len = qdisc_pkt_len(skb);
835
836 qdisc_qstats_backlog_dec(sch, skb);
837 __qdisc_drop(skb, to_free);
838 return len;
839 }
840
841 return 0;
842}
843
844static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
845 struct sk_buff **to_free)
846{
847 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
848}
849
850static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
851{
852 const struct qdisc_skb_head *qh = &sch->q;
853
854 return qh->head;
855}
856
857/* generic pseudo peek method for non-work-conserving qdisc */
858static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
859{
860 struct sk_buff *skb = skb_peek(&sch->gso_skb);
861
862 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
863 if (!skb) {
864 skb = sch->dequeue(sch);
865
866 if (skb) {
867 __skb_queue_head(&sch->gso_skb, skb);
868 /* it's still part of the queue */
869 qdisc_qstats_backlog_inc(sch, skb);
870 sch->q.qlen++;
871 }
872 }
873
874 return skb;
875}
876
877/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
878static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
879{
880 struct sk_buff *skb = skb_peek(&sch->gso_skb);
881
882 if (skb) {
883 skb = __skb_dequeue(&sch->gso_skb);
884 qdisc_qstats_backlog_dec(sch, skb);
885 sch->q.qlen--;
886 } else {
887 skb = sch->dequeue(sch);
888 }
889
890 return skb;
891}
892
893static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
894{
895 /*
896 * We do not know the backlog in bytes of this list, it
897 * is up to the caller to correct it
898 */
899 ASSERT_RTNL();
900 if (qh->qlen) {
901 rtnl_kfree_skbs(qh->head, qh->tail);
902
903 qh->head = NULL;
904 qh->tail = NULL;
905 qh->qlen = 0;
906 }
907}
908
909static inline void qdisc_reset_queue(struct Qdisc *sch)
910{
911 __qdisc_reset_queue(&sch->q);
912 sch->qstats.backlog = 0;
913}
914
915static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
916 struct Qdisc **pold)
917{
918 struct Qdisc *old;
919
920 sch_tree_lock(sch);
921 old = *pold;
922 *pold = new;
923 if (old != NULL) {
924 unsigned int qlen = old->q.qlen;
925 unsigned int backlog = old->qstats.backlog;
926
927 qdisc_reset(old);
928 qdisc_tree_reduce_backlog(old, qlen, backlog);
929 }
930 sch_tree_unlock(sch);
931
932 return old;
933}
934
935static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
936{
937 rtnl_kfree_skbs(skb, skb);
938 qdisc_qstats_drop(sch);
939}
940
941static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
942 struct sk_buff **to_free)
943{
944 __qdisc_drop(skb, to_free);
945 qdisc_qstats_cpu_drop(sch);
946
947 return NET_XMIT_DROP;
948}
949
950static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
951 struct sk_buff **to_free)
952{
953 __qdisc_drop(skb, to_free);
954 qdisc_qstats_drop(sch);
955
956 return NET_XMIT_DROP;
957}
958
959/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
960 long it will take to send a packet given its size.
961 */
962static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
963{
964 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
965 if (slot < 0)
966 slot = 0;
967 slot >>= rtab->rate.cell_log;
968 if (slot > 255)
969 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
970 return rtab->data[slot];
971}
972
973struct psched_ratecfg {
974 u64 rate_bytes_ps; /* bytes per second */
975 u32 mult;
976 u16 overhead;
977 u8 linklayer;
978 u8 shift;
979};
980
981static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
982 unsigned int len)
983{
984 len += r->overhead;
985
986 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
987 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
988
989 return ((u64)len * r->mult) >> r->shift;
990}
991
992void psched_ratecfg_precompute(struct psched_ratecfg *r,
993 const struct tc_ratespec *conf,
994 u64 rate64);
995
996static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
997 const struct psched_ratecfg *r)
998{
999 memset(res, 0, sizeof(*res));
1000
1001 /* legacy struct tc_ratespec has a 32bit @rate field
1002 * Qdisc using 64bit rate should add new attributes
1003 * in order to maintain compatibility.
1004 */
1005 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1006
1007 res->overhead = r->overhead;
1008 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1009}
1010
1011/* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1012 * The fast path only needs to access filter list and to update stats
1013 */
1014struct mini_Qdisc {
1015 struct tcf_proto *filter_list;
1016 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1017 struct gnet_stats_queue __percpu *cpu_qstats;
1018 struct rcu_head rcu;
1019};
1020
1021static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1022 const struct sk_buff *skb)
1023{
1024 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1025}
1026
1027static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1028{
1029 this_cpu_inc(miniq->cpu_qstats->drops);
1030}
1031
1032struct mini_Qdisc_pair {
1033 struct mini_Qdisc miniq1;
1034 struct mini_Qdisc miniq2;
1035 struct mini_Qdisc __rcu **p_miniq;
1036};
1037
1038void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1039 struct tcf_proto *tp_head);
1040void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1041 struct mini_Qdisc __rcu **p_miniq);
1042
1043#endif
Linux 6.x block layer and io_uring tree(s)