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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 READ_ONCE(qdisc->empty);
153 return !READ_ONCE(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 WRITE_ONCE(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 bool (*delete_empty)(struct tcf_proto *tp);
312 void (*walk)(struct tcf_proto *tp,
313 struct tcf_walker *arg, bool rtnl_held);
314 int (*reoffload)(struct tcf_proto *tp, bool add,
315 flow_setup_cb_t *cb, void *cb_priv,
316 struct netlink_ext_ack *extack);
317 void (*hw_add)(struct tcf_proto *tp,
318 void *type_data);
319 void (*hw_del)(struct tcf_proto *tp,
320 void *type_data);
321 void (*bind_class)(void *, u32, unsigned long,
322 void *, unsigned long);
323 void * (*tmplt_create)(struct net *net,
324 struct tcf_chain *chain,
325 struct nlattr **tca,
326 struct netlink_ext_ack *extack);
327 void (*tmplt_destroy)(void *tmplt_priv);
328
329 /* rtnetlink specific */
330 int (*dump)(struct net*, struct tcf_proto*, void *,
331 struct sk_buff *skb, struct tcmsg*,
332 bool);
333 int (*terse_dump)(struct net *net,
334 struct tcf_proto *tp, void *fh,
335 struct sk_buff *skb,
336 struct tcmsg *t, bool rtnl_held);
337 int (*tmplt_dump)(struct sk_buff *skb,
338 struct net *net,
339 void *tmplt_priv);
340
341 struct module *owner;
342 int flags;
343};
344
345/* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
346 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
347 * conditions can occur when filters are inserted/deleted simultaneously.
348 */
349enum tcf_proto_ops_flags {
350 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
351};
352
353struct tcf_proto {
354 /* Fast access part */
355 struct tcf_proto __rcu *next;
356 void __rcu *root;
357
358 /* called under RCU BH lock*/
359 int (*classify)(struct sk_buff *,
360 const struct tcf_proto *,
361 struct tcf_result *);
362 __be16 protocol;
363
364 /* All the rest */
365 u32 prio;
366 void *data;
367 const struct tcf_proto_ops *ops;
368 struct tcf_chain *chain;
369 /* Lock protects tcf_proto shared state and can be used by unlocked
370 * classifiers to protect their private data.
371 */
372 spinlock_t lock;
373 bool deleting;
374 refcount_t refcnt;
375 struct rcu_head rcu;
376 struct hlist_node destroy_ht_node;
377};
378
379struct qdisc_skb_cb {
380 struct {
381 unsigned int pkt_len;
382 u16 slave_dev_queue_mapping;
383 u16 tc_classid;
384 };
385#define QDISC_CB_PRIV_LEN 20
386 unsigned char data[QDISC_CB_PRIV_LEN];
387 u16 mru;
388};
389
390typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
391
392struct tcf_chain {
393 /* Protects filter_chain. */
394 struct mutex filter_chain_lock;
395 struct tcf_proto __rcu *filter_chain;
396 struct list_head list;
397 struct tcf_block *block;
398 u32 index; /* chain index */
399 unsigned int refcnt;
400 unsigned int action_refcnt;
401 bool explicitly_created;
402 bool flushing;
403 const struct tcf_proto_ops *tmplt_ops;
404 void *tmplt_priv;
405 struct rcu_head rcu;
406};
407
408struct tcf_block {
409 /* Lock protects tcf_block and lifetime-management data of chains
410 * attached to the block (refcnt, action_refcnt, explicitly_created).
411 */
412 struct mutex lock;
413 struct list_head chain_list;
414 u32 index; /* block index for shared blocks */
415 u32 classid; /* which class this block belongs to */
416 refcount_t refcnt;
417 struct net *net;
418 struct Qdisc *q;
419 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
420 struct flow_block flow_block;
421 struct list_head owner_list;
422 bool keep_dst;
423 atomic_t offloadcnt; /* Number of oddloaded filters */
424 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
425 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
426 struct {
427 struct tcf_chain *chain;
428 struct list_head filter_chain_list;
429 } chain0;
430 struct rcu_head rcu;
431 DECLARE_HASHTABLE(proto_destroy_ht, 7);
432 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
433};
434
435#ifdef CONFIG_PROVE_LOCKING
436static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
437{
438 return lockdep_is_held(&chain->filter_chain_lock);
439}
440
441static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
442{
443 return lockdep_is_held(&tp->lock);
444}
445#else
446static inline bool lockdep_tcf_chain_is_locked(struct tcf_block *chain)
447{
448 return true;
449}
450
451static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
452{
453 return true;
454}
455#endif /* #ifdef CONFIG_PROVE_LOCKING */
456
457#define tcf_chain_dereference(p, chain) \
458 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
459
460#define tcf_proto_dereference(p, tp) \
461 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
462
463static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
464{
465 struct qdisc_skb_cb *qcb;
466
467 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb));
468 BUILD_BUG_ON(sizeof(qcb->data) < sz);
469}
470
471static inline int qdisc_qlen_cpu(const struct Qdisc *q)
472{
473 return this_cpu_ptr(q->cpu_qstats)->qlen;
474}
475
476static inline int qdisc_qlen(const struct Qdisc *q)
477{
478 return q->q.qlen;
479}
480
481static inline int qdisc_qlen_sum(const struct Qdisc *q)
482{
483 __u32 qlen = q->qstats.qlen;
484 int i;
485
486 if (qdisc_is_percpu_stats(q)) {
487 for_each_possible_cpu(i)
488 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
489 } else {
490 qlen += q->q.qlen;
491 }
492
493 return qlen;
494}
495
496static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
497{
498 return (struct qdisc_skb_cb *)skb->cb;
499}
500
501static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
502{
503 return &qdisc->q.lock;
504}
505
506static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
507{
508 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
509
510 return q;
511}
512
513static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
514{
515 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
516}
517
518static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
519{
520 return qdisc->dev_queue->qdisc_sleeping;
521}
522
523/* The qdisc root lock is a mechanism by which to top level
524 * of a qdisc tree can be locked from any qdisc node in the
525 * forest. This allows changing the configuration of some
526 * aspect of the qdisc tree while blocking out asynchronous
527 * qdisc access in the packet processing paths.
528 *
529 * It is only legal to do this when the root will not change
530 * on us. Otherwise we'll potentially lock the wrong qdisc
531 * root. This is enforced by holding the RTNL semaphore, which
532 * all users of this lock accessor must do.
533 */
534static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
535{
536 struct Qdisc *root = qdisc_root(qdisc);
537
538 ASSERT_RTNL();
539 return qdisc_lock(root);
540}
541
542static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
543{
544 struct Qdisc *root = qdisc_root_sleeping(qdisc);
545
546 ASSERT_RTNL();
547 return qdisc_lock(root);
548}
549
550static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
551{
552 struct Qdisc *root = qdisc_root_sleeping(qdisc);
553
554 ASSERT_RTNL();
555 return &root->running;
556}
557
558static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
559{
560 return qdisc->dev_queue->dev;
561}
562
563static inline void sch_tree_lock(const struct Qdisc *q)
564{
565 spin_lock_bh(qdisc_root_sleeping_lock(q));
566}
567
568static inline void sch_tree_unlock(const struct Qdisc *q)
569{
570 spin_unlock_bh(qdisc_root_sleeping_lock(q));
571}
572
573extern struct Qdisc noop_qdisc;
574extern struct Qdisc_ops noop_qdisc_ops;
575extern struct Qdisc_ops pfifo_fast_ops;
576extern struct Qdisc_ops mq_qdisc_ops;
577extern struct Qdisc_ops noqueue_qdisc_ops;
578extern const struct Qdisc_ops *default_qdisc_ops;
579static inline const struct Qdisc_ops *
580get_default_qdisc_ops(const struct net_device *dev, int ntx)
581{
582 return ntx < dev->real_num_tx_queues ?
583 default_qdisc_ops : &pfifo_fast_ops;
584}
585
586struct Qdisc_class_common {
587 u32 classid;
588 struct hlist_node hnode;
589};
590
591struct Qdisc_class_hash {
592 struct hlist_head *hash;
593 unsigned int hashsize;
594 unsigned int hashmask;
595 unsigned int hashelems;
596};
597
598static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
599{
600 id ^= id >> 8;
601 id ^= id >> 4;
602 return id & mask;
603}
604
605static inline struct Qdisc_class_common *
606qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
607{
608 struct Qdisc_class_common *cl;
609 unsigned int h;
610
611 if (!id)
612 return NULL;
613
614 h = qdisc_class_hash(id, hash->hashmask);
615 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
616 if (cl->classid == id)
617 return cl;
618 }
619 return NULL;
620}
621
622static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
623{
624 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
625
626 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
627}
628
629int qdisc_class_hash_init(struct Qdisc_class_hash *);
630void qdisc_class_hash_insert(struct Qdisc_class_hash *,
631 struct Qdisc_class_common *);
632void qdisc_class_hash_remove(struct Qdisc_class_hash *,
633 struct Qdisc_class_common *);
634void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
635void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
636
637int dev_qdisc_change_tx_queue_len(struct net_device *dev);
638void dev_init_scheduler(struct net_device *dev);
639void dev_shutdown(struct net_device *dev);
640void dev_activate(struct net_device *dev);
641void dev_deactivate(struct net_device *dev);
642void dev_deactivate_many(struct list_head *head);
643struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
644 struct Qdisc *qdisc);
645void qdisc_reset(struct Qdisc *qdisc);
646void qdisc_put(struct Qdisc *qdisc);
647void qdisc_put_unlocked(struct Qdisc *qdisc);
648void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
649#ifdef CONFIG_NET_SCHED
650int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
651 void *type_data);
652void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
653 struct Qdisc *new, struct Qdisc *old,
654 enum tc_setup_type type, void *type_data,
655 struct netlink_ext_ack *extack);
656#else
657static inline int
658qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
659 void *type_data)
660{
661 q->flags &= ~TCQ_F_OFFLOADED;
662 return 0;
663}
664
665static inline void
666qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
667 struct Qdisc *new, struct Qdisc *old,
668 enum tc_setup_type type, void *type_data,
669 struct netlink_ext_ack *extack)
670{
671}
672#endif
673struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
674 const struct Qdisc_ops *ops,
675 struct netlink_ext_ack *extack);
676void qdisc_free(struct Qdisc *qdisc);
677struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
678 const struct Qdisc_ops *ops, u32 parentid,
679 struct netlink_ext_ack *extack);
680void __qdisc_calculate_pkt_len(struct sk_buff *skb,
681 const struct qdisc_size_table *stab);
682int skb_do_redirect(struct sk_buff *);
683
684static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
685{
686#ifdef CONFIG_NET_CLS_ACT
687 return skb->tc_at_ingress;
688#else
689 return false;
690#endif
691}
692
693static inline bool skb_skip_tc_classify(struct sk_buff *skb)
694{
695#ifdef CONFIG_NET_CLS_ACT
696 if (skb->tc_skip_classify) {
697 skb->tc_skip_classify = 0;
698 return true;
699 }
700#endif
701 return false;
702}
703
704/* Reset all TX qdiscs greater than index of a device. */
705static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
706{
707 struct Qdisc *qdisc;
708
709 for (; i < dev->num_tx_queues; i++) {
710 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
711 if (qdisc) {
712 spin_lock_bh(qdisc_lock(qdisc));
713 qdisc_reset(qdisc);
714 spin_unlock_bh(qdisc_lock(qdisc));
715 }
716 }
717}
718
719/* Are all TX queues of the device empty? */
720static inline bool qdisc_all_tx_empty(const struct net_device *dev)
721{
722 unsigned int i;
723
724 rcu_read_lock();
725 for (i = 0; i < dev->num_tx_queues; i++) {
726 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
727 const struct Qdisc *q = rcu_dereference(txq->qdisc);
728
729 if (!qdisc_is_empty(q)) {
730 rcu_read_unlock();
731 return false;
732 }
733 }
734 rcu_read_unlock();
735 return true;
736}
737
738/* Are any of the TX qdiscs changing? */
739static inline bool qdisc_tx_changing(const struct net_device *dev)
740{
741 unsigned int i;
742
743 for (i = 0; i < dev->num_tx_queues; i++) {
744 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
745 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
746 return true;
747 }
748 return false;
749}
750
751/* Is the device using the noop qdisc on all queues? */
752static inline bool qdisc_tx_is_noop(const struct net_device *dev)
753{
754 unsigned int i;
755
756 for (i = 0; i < dev->num_tx_queues; i++) {
757 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
758 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
759 return false;
760 }
761 return true;
762}
763
764static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
765{
766 return qdisc_skb_cb(skb)->pkt_len;
767}
768
769/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
770enum net_xmit_qdisc_t {
771 __NET_XMIT_STOLEN = 0x00010000,
772 __NET_XMIT_BYPASS = 0x00020000,
773};
774
775#ifdef CONFIG_NET_CLS_ACT
776#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
777#else
778#define net_xmit_drop_count(e) (1)
779#endif
780
781static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
782 const struct Qdisc *sch)
783{
784#ifdef CONFIG_NET_SCHED
785 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
786
787 if (stab)
788 __qdisc_calculate_pkt_len(skb, stab);
789#endif
790}
791
792static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
793 struct sk_buff **to_free)
794{
795 qdisc_calculate_pkt_len(skb, sch);
796 return sch->enqueue(skb, sch, to_free);
797}
798
799static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
800 __u64 bytes, __u32 packets)
801{
802 bstats->bytes += bytes;
803 bstats->packets += packets;
804}
805
806static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
807 const struct sk_buff *skb)
808{
809 _bstats_update(bstats,
810 qdisc_pkt_len(skb),
811 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
812}
813
814static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
815 __u64 bytes, __u32 packets)
816{
817 u64_stats_update_begin(&bstats->syncp);
818 _bstats_update(&bstats->bstats, bytes, packets);
819 u64_stats_update_end(&bstats->syncp);
820}
821
822static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
823 const struct sk_buff *skb)
824{
825 u64_stats_update_begin(&bstats->syncp);
826 bstats_update(&bstats->bstats, skb);
827 u64_stats_update_end(&bstats->syncp);
828}
829
830static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
831 const struct sk_buff *skb)
832{
833 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
834}
835
836static inline void qdisc_bstats_update(struct Qdisc *sch,
837 const struct sk_buff *skb)
838{
839 bstats_update(&sch->bstats, skb);
840}
841
842static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
843 const struct sk_buff *skb)
844{
845 sch->qstats.backlog -= qdisc_pkt_len(skb);
846}
847
848static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
849 const struct sk_buff *skb)
850{
851 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
852}
853
854static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
855 const struct sk_buff *skb)
856{
857 sch->qstats.backlog += qdisc_pkt_len(skb);
858}
859
860static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
861 const struct sk_buff *skb)
862{
863 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
864}
865
866static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
867{
868 this_cpu_inc(sch->cpu_qstats->qlen);
869}
870
871static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
872{
873 this_cpu_dec(sch->cpu_qstats->qlen);
874}
875
876static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
877{
878 this_cpu_inc(sch->cpu_qstats->requeues);
879}
880
881static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
882{
883 sch->qstats.drops += count;
884}
885
886static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
887{
888 qstats->drops++;
889}
890
891static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
892{
893 qstats->overlimits++;
894}
895
896static inline void qdisc_qstats_drop(struct Qdisc *sch)
897{
898 qstats_drop_inc(&sch->qstats);
899}
900
901static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
902{
903 this_cpu_inc(sch->cpu_qstats->drops);
904}
905
906static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
907{
908 sch->qstats.overlimits++;
909}
910
911static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
912{
913 __u32 qlen = qdisc_qlen_sum(sch);
914
915 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
916}
917
918static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
919 __u32 *backlog)
920{
921 struct gnet_stats_queue qstats = { 0 };
922 __u32 len = qdisc_qlen_sum(sch);
923
924 __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
925 *qlen = qstats.qlen;
926 *backlog = qstats.backlog;
927}
928
929static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
930{
931 __u32 qlen, backlog;
932
933 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
934 qdisc_tree_reduce_backlog(sch, qlen, backlog);
935}
936
937static inline void qdisc_purge_queue(struct Qdisc *sch)
938{
939 __u32 qlen, backlog;
940
941 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
942 qdisc_reset(sch);
943 qdisc_tree_reduce_backlog(sch, qlen, backlog);
944}
945
946static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
947{
948 qh->head = NULL;
949 qh->tail = NULL;
950 qh->qlen = 0;
951}
952
953static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
954 struct qdisc_skb_head *qh)
955{
956 struct sk_buff *last = qh->tail;
957
958 if (last) {
959 skb->next = NULL;
960 last->next = skb;
961 qh->tail = skb;
962 } else {
963 qh->tail = skb;
964 qh->head = skb;
965 }
966 qh->qlen++;
967}
968
969static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
970{
971 __qdisc_enqueue_tail(skb, &sch->q);
972 qdisc_qstats_backlog_inc(sch, skb);
973 return NET_XMIT_SUCCESS;
974}
975
976static inline void __qdisc_enqueue_head(struct sk_buff *skb,
977 struct qdisc_skb_head *qh)
978{
979 skb->next = qh->head;
980
981 if (!qh->head)
982 qh->tail = skb;
983 qh->head = skb;
984 qh->qlen++;
985}
986
987static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
988{
989 struct sk_buff *skb = qh->head;
990
991 if (likely(skb != NULL)) {
992 qh->head = skb->next;
993 qh->qlen--;
994 if (qh->head == NULL)
995 qh->tail = NULL;
996 skb->next = NULL;
997 }
998
999 return skb;
1000}
1001
1002static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1003{
1004 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1005
1006 if (likely(skb != NULL)) {
1007 qdisc_qstats_backlog_dec(sch, skb);
1008 qdisc_bstats_update(sch, skb);
1009 }
1010
1011 return skb;
1012}
1013
1014/* Instead of calling kfree_skb() while root qdisc lock is held,
1015 * queue the skb for future freeing at end of __dev_xmit_skb()
1016 */
1017static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1018{
1019 skb->next = *to_free;
1020 *to_free = skb;
1021}
1022
1023static inline void __qdisc_drop_all(struct sk_buff *skb,
1024 struct sk_buff **to_free)
1025{
1026 if (skb->prev)
1027 skb->prev->next = *to_free;
1028 else
1029 skb->next = *to_free;
1030 *to_free = skb;
1031}
1032
1033static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1034 struct qdisc_skb_head *qh,
1035 struct sk_buff **to_free)
1036{
1037 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1038
1039 if (likely(skb != NULL)) {
1040 unsigned int len = qdisc_pkt_len(skb);
1041
1042 qdisc_qstats_backlog_dec(sch, skb);
1043 __qdisc_drop(skb, to_free);
1044 return len;
1045 }
1046
1047 return 0;
1048}
1049
1050static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
1051 struct sk_buff **to_free)
1052{
1053 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
1054}
1055
1056static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1057{
1058 const struct qdisc_skb_head *qh = &sch->q;
1059
1060 return qh->head;
1061}
1062
1063/* generic pseudo peek method for non-work-conserving qdisc */
1064static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1065{
1066 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1067
1068 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1069 if (!skb) {
1070 skb = sch->dequeue(sch);
1071
1072 if (skb) {
1073 __skb_queue_head(&sch->gso_skb, skb);
1074 /* it's still part of the queue */
1075 qdisc_qstats_backlog_inc(sch, skb);
1076 sch->q.qlen++;
1077 }
1078 }
1079
1080 return skb;
1081}
1082
1083static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1084 struct sk_buff *skb)
1085{
1086 if (qdisc_is_percpu_stats(sch)) {
1087 qdisc_qstats_cpu_backlog_dec(sch, skb);
1088 qdisc_bstats_cpu_update(sch, skb);
1089 qdisc_qstats_cpu_qlen_dec(sch);
1090 } else {
1091 qdisc_qstats_backlog_dec(sch, skb);
1092 qdisc_bstats_update(sch, skb);
1093 sch->q.qlen--;
1094 }
1095}
1096
1097static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1098 unsigned int pkt_len)
1099{
1100 if (qdisc_is_percpu_stats(sch)) {
1101 qdisc_qstats_cpu_qlen_inc(sch);
1102 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1103 } else {
1104 sch->qstats.backlog += pkt_len;
1105 sch->q.qlen++;
1106 }
1107}
1108
1109/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1110static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1111{
1112 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1113
1114 if (skb) {
1115 skb = __skb_dequeue(&sch->gso_skb);
1116 if (qdisc_is_percpu_stats(sch)) {
1117 qdisc_qstats_cpu_backlog_dec(sch, skb);
1118 qdisc_qstats_cpu_qlen_dec(sch);
1119 } else {
1120 qdisc_qstats_backlog_dec(sch, skb);
1121 sch->q.qlen--;
1122 }
1123 } else {
1124 skb = sch->dequeue(sch);
1125 }
1126
1127 return skb;
1128}
1129
1130static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1131{
1132 /*
1133 * We do not know the backlog in bytes of this list, it
1134 * is up to the caller to correct it
1135 */
1136 ASSERT_RTNL();
1137 if (qh->qlen) {
1138 rtnl_kfree_skbs(qh->head, qh->tail);
1139
1140 qh->head = NULL;
1141 qh->tail = NULL;
1142 qh->qlen = 0;
1143 }
1144}
1145
1146static inline void qdisc_reset_queue(struct Qdisc *sch)
1147{
1148 __qdisc_reset_queue(&sch->q);
1149 sch->qstats.backlog = 0;
1150}
1151
1152static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1153 struct Qdisc **pold)
1154{
1155 struct Qdisc *old;
1156
1157 sch_tree_lock(sch);
1158 old = *pold;
1159 *pold = new;
1160 if (old != NULL)
1161 qdisc_tree_flush_backlog(old);
1162 sch_tree_unlock(sch);
1163
1164 return old;
1165}
1166
1167static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1168{
1169 rtnl_kfree_skbs(skb, skb);
1170 qdisc_qstats_drop(sch);
1171}
1172
1173static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1174 struct sk_buff **to_free)
1175{
1176 __qdisc_drop(skb, to_free);
1177 qdisc_qstats_cpu_drop(sch);
1178
1179 return NET_XMIT_DROP;
1180}
1181
1182static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1183 struct sk_buff **to_free)
1184{
1185 __qdisc_drop(skb, to_free);
1186 qdisc_qstats_drop(sch);
1187
1188 return NET_XMIT_DROP;
1189}
1190
1191static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1192 struct sk_buff **to_free)
1193{
1194 __qdisc_drop_all(skb, to_free);
1195 qdisc_qstats_drop(sch);
1196
1197 return NET_XMIT_DROP;
1198}
1199
1200/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1201 long it will take to send a packet given its size.
1202 */
1203static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1204{
1205 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1206 if (slot < 0)
1207 slot = 0;
1208 slot >>= rtab->rate.cell_log;
1209 if (slot > 255)
1210 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1211 return rtab->data[slot];
1212}
1213
1214struct psched_ratecfg {
1215 u64 rate_bytes_ps; /* bytes per second */
1216 u32 mult;
1217 u16 overhead;
1218 u8 linklayer;
1219 u8 shift;
1220};
1221
1222static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1223 unsigned int len)
1224{
1225 len += r->overhead;
1226
1227 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1228 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1229
1230 return ((u64)len * r->mult) >> r->shift;
1231}
1232
1233void psched_ratecfg_precompute(struct psched_ratecfg *r,
1234 const struct tc_ratespec *conf,
1235 u64 rate64);
1236
1237static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1238 const struct psched_ratecfg *r)
1239{
1240 memset(res, 0, sizeof(*res));
1241
1242 /* legacy struct tc_ratespec has a 32bit @rate field
1243 * Qdisc using 64bit rate should add new attributes
1244 * in order to maintain compatibility.
1245 */
1246 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1247
1248 res->overhead = r->overhead;
1249 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1250}
1251
1252/* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1253 * The fast path only needs to access filter list and to update stats
1254 */
1255struct mini_Qdisc {
1256 struct tcf_proto *filter_list;
1257 struct tcf_block *block;
1258 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1259 struct gnet_stats_queue __percpu *cpu_qstats;
1260 struct rcu_head rcu;
1261};
1262
1263static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1264 const struct sk_buff *skb)
1265{
1266 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1267}
1268
1269static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1270{
1271 this_cpu_inc(miniq->cpu_qstats->drops);
1272}
1273
1274struct mini_Qdisc_pair {
1275 struct mini_Qdisc miniq1;
1276 struct mini_Qdisc miniq2;
1277 struct mini_Qdisc __rcu **p_miniq;
1278};
1279
1280void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1281 struct tcf_proto *tp_head);
1282void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1283 struct mini_Qdisc __rcu **p_miniq);
1284void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1285 struct tcf_block *block);
1286
1287static inline int skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res)
1288{
1289 return res->ingress ? netif_receive_skb(skb) : dev_queue_xmit(skb);
1290}
1291
1292#endif