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
23 struct Qdisc_ops;
24 struct qdisc_walker;
25 struct tcf_walker;
26 struct module;
27 struct bpf_flow_keys;
28
29 struct qdisc_rate_table {
30 struct tc_ratespec rate;
31 u32 data[256];
32 struct qdisc_rate_table *next;
33 int refcnt;
34 };
35
36 enum qdisc_state_t {
37 __QDISC_STATE_SCHED,
38 __QDISC_STATE_DEACTIVATED,
39 __QDISC_STATE_MISSED,
40 __QDISC_STATE_DRAINING,
41 };
42
43 enum qdisc_state2_t {
44 /* Only for !TCQ_F_NOLOCK qdisc. Never access it directly.
45 * Use qdisc_run_begin/end() or qdisc_is_running() instead.
46 */
47 __QDISC_STATE2_RUNNING,
48 };
49
50 #define QDISC_STATE_MISSED BIT(__QDISC_STATE_MISSED)
51 #define QDISC_STATE_DRAINING BIT(__QDISC_STATE_DRAINING)
52
53 #define QDISC_STATE_NON_EMPTY (QDISC_STATE_MISSED | \
54 QDISC_STATE_DRAINING)
55
56 struct qdisc_size_table {
57 struct rcu_head rcu;
58 struct list_head list;
59 struct tc_sizespec szopts;
60 int refcnt;
61 u16 data[];
62 };
63
64 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
65 struct qdisc_skb_head {
66 struct sk_buff *head;
67 struct sk_buff *tail;
68 __u32 qlen;
69 spinlock_t lock;
70 };
71
72 struct Qdisc {
73 int (*enqueue)(struct sk_buff *skb,
74 struct Qdisc *sch,
75 struct sk_buff **to_free);
76 struct sk_buff * (*dequeue)(struct Qdisc *sch);
77 unsigned int flags;
78 #define TCQ_F_BUILTIN 1
79 #define TCQ_F_INGRESS 2
80 #define TCQ_F_CAN_BYPASS 4
81 #define TCQ_F_MQROOT 8
82 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
83 * q->dev_queue : It can test
84 * netif_xmit_frozen_or_stopped() before
85 * dequeueing next packet.
86 * Its true for MQ/MQPRIO slaves, or non
87 * multiqueue device.
88 */
89 #define TCQ_F_WARN_NONWC (1 << 16)
90 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
91 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
92 * qdisc_tree_decrease_qlen() should stop.
93 */
94 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
95 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
96 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
97 u32 limit;
98 const struct Qdisc_ops *ops;
99 struct qdisc_size_table __rcu *stab;
100 struct hlist_node hash;
101 u32 handle;
102 u32 parent;
103
104 struct netdev_queue *dev_queue;
105
106 struct net_rate_estimator __rcu *rate_est;
107 struct gnet_stats_basic_sync __percpu *cpu_bstats;
108 struct gnet_stats_queue __percpu *cpu_qstats;
109 int pad;
110 refcount_t refcnt;
111
112 /*
113 * For performance sake on SMP, we put highly modified fields at the end
114 */
115 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
116 struct qdisc_skb_head q;
117 struct gnet_stats_basic_sync bstats;
118 struct gnet_stats_queue qstats;
119 unsigned long state;
120 unsigned long state2; /* must be written under qdisc spinlock */
121 struct Qdisc *next_sched;
122 struct sk_buff_head skb_bad_txq;
123
124 spinlock_t busylock ____cacheline_aligned_in_smp;
125 spinlock_t seqlock;
126
127 struct rcu_head rcu;
128 netdevice_tracker dev_tracker;
129 struct lock_class_key root_lock_key;
130 /* private data */
131 long privdata[] ____cacheline_aligned;
132 };
133
qdisc_refcount_inc(struct Qdisc * qdisc)134 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
135 {
136 if (qdisc->flags & TCQ_F_BUILTIN)
137 return;
138 refcount_inc(&qdisc->refcnt);
139 }
140
qdisc_refcount_dec_if_one(struct Qdisc * qdisc)141 static inline bool qdisc_refcount_dec_if_one(struct Qdisc *qdisc)
142 {
143 if (qdisc->flags & TCQ_F_BUILTIN)
144 return true;
145 return refcount_dec_if_one(&qdisc->refcnt);
146 }
147
148 /* Intended to be used by unlocked users, when concurrent qdisc release is
149 * possible.
150 */
151
qdisc_refcount_inc_nz(struct Qdisc * qdisc)152 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
153 {
154 if (qdisc->flags & TCQ_F_BUILTIN)
155 return qdisc;
156 if (refcount_inc_not_zero(&qdisc->refcnt))
157 return qdisc;
158 return NULL;
159 }
160
161 /* For !TCQ_F_NOLOCK qdisc: callers must either call this within a qdisc
162 * root_lock section, or provide their own memory barriers -- ordering
163 * against qdisc_run_begin/end() atomic bit operations.
164 */
qdisc_is_running(struct Qdisc * qdisc)165 static inline bool qdisc_is_running(struct Qdisc *qdisc)
166 {
167 if (qdisc->flags & TCQ_F_NOLOCK)
168 return spin_is_locked(&qdisc->seqlock);
169 return test_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
170 }
171
nolock_qdisc_is_empty(const struct Qdisc * qdisc)172 static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc)
173 {
174 return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY);
175 }
176
qdisc_is_percpu_stats(const struct Qdisc * q)177 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
178 {
179 return q->flags & TCQ_F_CPUSTATS;
180 }
181
qdisc_is_empty(const struct Qdisc * qdisc)182 static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
183 {
184 if (qdisc_is_percpu_stats(qdisc))
185 return nolock_qdisc_is_empty(qdisc);
186 return !READ_ONCE(qdisc->q.qlen);
187 }
188
189 /* For !TCQ_F_NOLOCK qdisc, qdisc_run_begin/end() must be invoked with
190 * the qdisc root lock acquired.
191 */
qdisc_run_begin(struct Qdisc * qdisc)192 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
193 {
194 if (qdisc->flags & TCQ_F_NOLOCK) {
195 if (spin_trylock(&qdisc->seqlock))
196 return true;
197
198 /* No need to insist if the MISSED flag was already set.
199 * Note that test_and_set_bit() also gives us memory ordering
200 * guarantees wrt potential earlier enqueue() and below
201 * spin_trylock(), both of which are necessary to prevent races
202 */
203 if (test_and_set_bit(__QDISC_STATE_MISSED, &qdisc->state))
204 return false;
205
206 /* Try to take the lock again to make sure that we will either
207 * grab it or the CPU that still has it will see MISSED set
208 * when testing it in qdisc_run_end()
209 */
210 return spin_trylock(&qdisc->seqlock);
211 }
212 return !__test_and_set_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
213 }
214
qdisc_run_end(struct Qdisc * qdisc)215 static inline void qdisc_run_end(struct Qdisc *qdisc)
216 {
217 if (qdisc->flags & TCQ_F_NOLOCK) {
218 spin_unlock(&qdisc->seqlock);
219
220 /* spin_unlock() only has store-release semantic. The unlock
221 * and test_bit() ordering is a store-load ordering, so a full
222 * memory barrier is needed here.
223 */
224 smp_mb();
225
226 if (unlikely(test_bit(__QDISC_STATE_MISSED,
227 &qdisc->state)))
228 __netif_schedule(qdisc);
229 } else {
230 __clear_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
231 }
232 }
233
qdisc_may_bulk(const struct Qdisc * qdisc)234 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
235 {
236 return qdisc->flags & TCQ_F_ONETXQUEUE;
237 }
238
qdisc_avail_bulklimit(const struct netdev_queue * txq)239 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
240 {
241 #ifdef CONFIG_BQL
242 /* Non-BQL migrated drivers will return 0, too. */
243 return dql_avail(&txq->dql);
244 #else
245 return 0;
246 #endif
247 }
248
249 struct Qdisc_class_ops {
250 unsigned int flags;
251 /* Child qdisc manipulation */
252 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
253 int (*graft)(struct Qdisc *, unsigned long cl,
254 struct Qdisc *, struct Qdisc **,
255 struct netlink_ext_ack *extack);
256 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
257 void (*qlen_notify)(struct Qdisc *, unsigned long);
258
259 /* Class manipulation routines */
260 unsigned long (*find)(struct Qdisc *, u32 classid);
261 int (*change)(struct Qdisc *, u32, u32,
262 struct nlattr **, unsigned long *,
263 struct netlink_ext_ack *);
264 int (*delete)(struct Qdisc *, unsigned long,
265 struct netlink_ext_ack *);
266 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
267
268 /* Filter manipulation */
269 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
270 unsigned long arg,
271 struct netlink_ext_ack *extack);
272 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
273 u32 classid);
274 void (*unbind_tcf)(struct Qdisc *, unsigned long);
275
276 /* rtnetlink specific */
277 int (*dump)(struct Qdisc *, unsigned long,
278 struct sk_buff *skb, struct tcmsg*);
279 int (*dump_stats)(struct Qdisc *, unsigned long,
280 struct gnet_dump *);
281 };
282
283 /* Qdisc_class_ops flag values */
284
285 /* Implements API that doesn't require rtnl lock */
286 enum qdisc_class_ops_flags {
287 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
288 };
289
290 struct Qdisc_ops {
291 struct Qdisc_ops *next;
292 const struct Qdisc_class_ops *cl_ops;
293 char id[IFNAMSIZ];
294 int priv_size;
295 unsigned int static_flags;
296
297 int (*enqueue)(struct sk_buff *skb,
298 struct Qdisc *sch,
299 struct sk_buff **to_free);
300 struct sk_buff * (*dequeue)(struct Qdisc *);
301 struct sk_buff * (*peek)(struct Qdisc *);
302
303 int (*init)(struct Qdisc *sch, struct nlattr *arg,
304 struct netlink_ext_ack *extack);
305 void (*reset)(struct Qdisc *);
306 void (*destroy)(struct Qdisc *);
307 int (*change)(struct Qdisc *sch,
308 struct nlattr *arg,
309 struct netlink_ext_ack *extack);
310 void (*attach)(struct Qdisc *sch);
311 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
312 void (*change_real_num_tx)(struct Qdisc *sch,
313 unsigned int new_real_tx);
314
315 int (*dump)(struct Qdisc *, struct sk_buff *);
316 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
317
318 void (*ingress_block_set)(struct Qdisc *sch,
319 u32 block_index);
320 void (*egress_block_set)(struct Qdisc *sch,
321 u32 block_index);
322 u32 (*ingress_block_get)(struct Qdisc *sch);
323 u32 (*egress_block_get)(struct Qdisc *sch);
324
325 struct module *owner;
326 };
327
328
329 struct tcf_result {
330 union {
331 struct {
332 unsigned long class;
333 u32 classid;
334 };
335 const struct tcf_proto *goto_tp;
336
337 };
338 };
339
340 struct tcf_chain;
341
342 struct tcf_proto_ops {
343 struct list_head head;
344 char kind[IFNAMSIZ];
345
346 int (*classify)(struct sk_buff *,
347 const struct tcf_proto *,
348 struct tcf_result *);
349 int (*init)(struct tcf_proto*);
350 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
351 struct netlink_ext_ack *extack);
352
353 void* (*get)(struct tcf_proto*, u32 handle);
354 void (*put)(struct tcf_proto *tp, void *f);
355 int (*change)(struct net *net, struct sk_buff *,
356 struct tcf_proto*, unsigned long,
357 u32 handle, struct nlattr **,
358 void **, u32,
359 struct netlink_ext_ack *);
360 int (*delete)(struct tcf_proto *tp, void *arg,
361 bool *last, bool rtnl_held,
362 struct netlink_ext_ack *);
363 bool (*delete_empty)(struct tcf_proto *tp);
364 void (*walk)(struct tcf_proto *tp,
365 struct tcf_walker *arg, bool rtnl_held);
366 int (*reoffload)(struct tcf_proto *tp, bool add,
367 flow_setup_cb_t *cb, void *cb_priv,
368 struct netlink_ext_ack *extack);
369 void (*hw_add)(struct tcf_proto *tp,
370 void *type_data);
371 void (*hw_del)(struct tcf_proto *tp,
372 void *type_data);
373 void (*bind_class)(void *, u32, unsigned long,
374 void *, unsigned long);
375 void * (*tmplt_create)(struct net *net,
376 struct tcf_chain *chain,
377 struct nlattr **tca,
378 struct netlink_ext_ack *extack);
379 void (*tmplt_destroy)(void *tmplt_priv);
380 void (*tmplt_reoffload)(struct tcf_chain *chain,
381 bool add,
382 flow_setup_cb_t *cb,
383 void *cb_priv);
384 struct tcf_exts * (*get_exts)(const struct tcf_proto *tp,
385 u32 handle);
386
387 /* rtnetlink specific */
388 int (*dump)(struct net*, struct tcf_proto*, void *,
389 struct sk_buff *skb, struct tcmsg*,
390 bool);
391 int (*terse_dump)(struct net *net,
392 struct tcf_proto *tp, void *fh,
393 struct sk_buff *skb,
394 struct tcmsg *t, bool rtnl_held);
395 int (*tmplt_dump)(struct sk_buff *skb,
396 struct net *net,
397 void *tmplt_priv);
398
399 struct module *owner;
400 int flags;
401 };
402
403 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
404 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
405 * conditions can occur when filters are inserted/deleted simultaneously.
406 */
407 enum tcf_proto_ops_flags {
408 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
409 };
410
411 struct tcf_proto {
412 /* Fast access part */
413 struct tcf_proto __rcu *next;
414 void __rcu *root;
415
416 /* called under RCU BH lock*/
417 int (*classify)(struct sk_buff *,
418 const struct tcf_proto *,
419 struct tcf_result *);
420 __be16 protocol;
421
422 /* All the rest */
423 u32 prio;
424 void *data;
425 const struct tcf_proto_ops *ops;
426 struct tcf_chain *chain;
427 /* Lock protects tcf_proto shared state and can be used by unlocked
428 * classifiers to protect their private data.
429 */
430 spinlock_t lock;
431 bool deleting;
432 refcount_t refcnt;
433 struct rcu_head rcu;
434 struct hlist_node destroy_ht_node;
435 };
436
437 struct qdisc_skb_cb {
438 struct {
439 unsigned int pkt_len;
440 u16 slave_dev_queue_mapping;
441 u16 tc_classid;
442 };
443 #define QDISC_CB_PRIV_LEN 20
444 unsigned char data[QDISC_CB_PRIV_LEN];
445 };
446
447 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
448
449 struct tcf_chain {
450 /* Protects filter_chain. */
451 struct mutex filter_chain_lock;
452 struct tcf_proto __rcu *filter_chain;
453 struct list_head list;
454 struct tcf_block *block;
455 u32 index; /* chain index */
456 unsigned int refcnt;
457 unsigned int action_refcnt;
458 bool explicitly_created;
459 bool flushing;
460 const struct tcf_proto_ops *tmplt_ops;
461 void *tmplt_priv;
462 struct rcu_head rcu;
463 };
464
465 struct tcf_block {
466 /* Lock protects tcf_block and lifetime-management data of chains
467 * attached to the block (refcnt, action_refcnt, explicitly_created).
468 */
469 struct mutex lock;
470 struct list_head chain_list;
471 u32 index; /* block index for shared blocks */
472 u32 classid; /* which class this block belongs to */
473 refcount_t refcnt;
474 struct net *net;
475 struct Qdisc *q;
476 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
477 struct flow_block flow_block;
478 struct list_head owner_list;
479 bool keep_dst;
480 atomic_t offloadcnt; /* Number of oddloaded filters */
481 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
482 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
483 struct {
484 struct tcf_chain *chain;
485 struct list_head filter_chain_list;
486 } chain0;
487 struct rcu_head rcu;
488 DECLARE_HASHTABLE(proto_destroy_ht, 7);
489 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
490 };
491
lockdep_tcf_chain_is_locked(struct tcf_chain * chain)492 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
493 {
494 return lockdep_is_held(&chain->filter_chain_lock);
495 }
496
lockdep_tcf_proto_is_locked(struct tcf_proto * tp)497 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
498 {
499 return lockdep_is_held(&tp->lock);
500 }
501
502 #define tcf_chain_dereference(p, chain) \
503 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
504
505 #define tcf_proto_dereference(p, tp) \
506 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
507
qdisc_cb_private_validate(const struct sk_buff * skb,int sz)508 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
509 {
510 struct qdisc_skb_cb *qcb;
511
512 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb));
513 BUILD_BUG_ON(sizeof(qcb->data) < sz);
514 }
515
qdisc_qlen(const struct Qdisc * q)516 static inline int qdisc_qlen(const struct Qdisc *q)
517 {
518 return q->q.qlen;
519 }
520
qdisc_qlen_sum(const struct Qdisc * q)521 static inline int qdisc_qlen_sum(const struct Qdisc *q)
522 {
523 __u32 qlen = q->qstats.qlen;
524 int i;
525
526 if (qdisc_is_percpu_stats(q)) {
527 for_each_possible_cpu(i)
528 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
529 } else {
530 qlen += q->q.qlen;
531 }
532
533 return qlen;
534 }
535
qdisc_skb_cb(const struct sk_buff * skb)536 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
537 {
538 return (struct qdisc_skb_cb *)skb->cb;
539 }
540
qdisc_lock(struct Qdisc * qdisc)541 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
542 {
543 return &qdisc->q.lock;
544 }
545
qdisc_root(const struct Qdisc * qdisc)546 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
547 {
548 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
549
550 return q;
551 }
552
qdisc_root_bh(const struct Qdisc * qdisc)553 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
554 {
555 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
556 }
557
qdisc_root_sleeping(const struct Qdisc * qdisc)558 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
559 {
560 return rcu_dereference_rtnl(qdisc->dev_queue->qdisc_sleeping);
561 }
562
qdisc_root_sleeping_lock(const struct Qdisc * qdisc)563 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
564 {
565 struct Qdisc *root = qdisc_root_sleeping(qdisc);
566
567 ASSERT_RTNL();
568 return qdisc_lock(root);
569 }
570
qdisc_dev(const struct Qdisc * qdisc)571 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
572 {
573 return qdisc->dev_queue->dev;
574 }
575
sch_tree_lock(struct Qdisc * q)576 static inline void sch_tree_lock(struct Qdisc *q)
577 {
578 if (q->flags & TCQ_F_MQROOT)
579 spin_lock_bh(qdisc_lock(q));
580 else
581 spin_lock_bh(qdisc_root_sleeping_lock(q));
582 }
583
sch_tree_unlock(struct Qdisc * q)584 static inline void sch_tree_unlock(struct Qdisc *q)
585 {
586 if (q->flags & TCQ_F_MQROOT)
587 spin_unlock_bh(qdisc_lock(q));
588 else
589 spin_unlock_bh(qdisc_root_sleeping_lock(q));
590 }
591
592 extern struct Qdisc noop_qdisc;
593 extern struct Qdisc_ops noop_qdisc_ops;
594 extern struct Qdisc_ops pfifo_fast_ops;
595 extern struct Qdisc_ops mq_qdisc_ops;
596 extern struct Qdisc_ops noqueue_qdisc_ops;
597 extern const struct Qdisc_ops *default_qdisc_ops;
598 static inline const struct Qdisc_ops *
get_default_qdisc_ops(const struct net_device * dev,int ntx)599 get_default_qdisc_ops(const struct net_device *dev, int ntx)
600 {
601 return ntx < dev->real_num_tx_queues ?
602 default_qdisc_ops : &pfifo_fast_ops;
603 }
604
605 struct Qdisc_class_common {
606 u32 classid;
607 unsigned int filter_cnt;
608 struct hlist_node hnode;
609 };
610
611 struct Qdisc_class_hash {
612 struct hlist_head *hash;
613 unsigned int hashsize;
614 unsigned int hashmask;
615 unsigned int hashelems;
616 };
617
qdisc_class_hash(u32 id,u32 mask)618 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
619 {
620 id ^= id >> 8;
621 id ^= id >> 4;
622 return id & mask;
623 }
624
625 static inline struct Qdisc_class_common *
qdisc_class_find(const struct Qdisc_class_hash * hash,u32 id)626 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
627 {
628 struct Qdisc_class_common *cl;
629 unsigned int h;
630
631 if (!id)
632 return NULL;
633
634 h = qdisc_class_hash(id, hash->hashmask);
635 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
636 if (cl->classid == id)
637 return cl;
638 }
639 return NULL;
640 }
641
qdisc_class_in_use(const struct Qdisc_class_common * cl)642 static inline bool qdisc_class_in_use(const struct Qdisc_class_common *cl)
643 {
644 return cl->filter_cnt > 0;
645 }
646
qdisc_class_get(struct Qdisc_class_common * cl)647 static inline void qdisc_class_get(struct Qdisc_class_common *cl)
648 {
649 unsigned int res;
650
651 if (check_add_overflow(cl->filter_cnt, 1, &res))
652 WARN(1, "Qdisc class overflow");
653
654 cl->filter_cnt = res;
655 }
656
qdisc_class_put(struct Qdisc_class_common * cl)657 static inline void qdisc_class_put(struct Qdisc_class_common *cl)
658 {
659 unsigned int res;
660
661 if (check_sub_overflow(cl->filter_cnt, 1, &res))
662 WARN(1, "Qdisc class underflow");
663
664 cl->filter_cnt = res;
665 }
666
tc_classid_to_hwtc(struct net_device * dev,u32 classid)667 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
668 {
669 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
670
671 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
672 }
673
674 int qdisc_class_hash_init(struct Qdisc_class_hash *);
675 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
676 struct Qdisc_class_common *);
677 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
678 struct Qdisc_class_common *);
679 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
680 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
681
682 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
683 void dev_qdisc_change_real_num_tx(struct net_device *dev,
684 unsigned int new_real_tx);
685 void dev_init_scheduler(struct net_device *dev);
686 void dev_shutdown(struct net_device *dev);
687 void dev_activate(struct net_device *dev);
688 void dev_deactivate(struct net_device *dev);
689 void dev_deactivate_many(struct list_head *head);
690 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
691 struct Qdisc *qdisc);
692 void qdisc_reset(struct Qdisc *qdisc);
693 void qdisc_destroy(struct Qdisc *qdisc);
694 void qdisc_put(struct Qdisc *qdisc);
695 void qdisc_put_unlocked(struct Qdisc *qdisc);
696 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
697 #ifdef CONFIG_NET_SCHED
698 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
699 void *type_data);
700 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
701 struct Qdisc *new, struct Qdisc *old,
702 enum tc_setup_type type, void *type_data,
703 struct netlink_ext_ack *extack);
704 #else
705 static inline int
qdisc_offload_dump_helper(struct Qdisc * q,enum tc_setup_type type,void * type_data)706 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
707 void *type_data)
708 {
709 q->flags &= ~TCQ_F_OFFLOADED;
710 return 0;
711 }
712
713 static inline void
qdisc_offload_graft_helper(struct net_device * dev,struct Qdisc * sch,struct Qdisc * new,struct Qdisc * old,enum tc_setup_type type,void * type_data,struct netlink_ext_ack * extack)714 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
715 struct Qdisc *new, struct Qdisc *old,
716 enum tc_setup_type type, void *type_data,
717 struct netlink_ext_ack *extack)
718 {
719 }
720 #endif
721 void qdisc_offload_query_caps(struct net_device *dev,
722 enum tc_setup_type type,
723 void *caps, size_t caps_len);
724 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
725 const struct Qdisc_ops *ops,
726 struct netlink_ext_ack *extack);
727 void qdisc_free(struct Qdisc *qdisc);
728 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
729 const struct Qdisc_ops *ops, u32 parentid,
730 struct netlink_ext_ack *extack);
731 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
732 const struct qdisc_size_table *stab);
733 int skb_do_redirect(struct sk_buff *);
734
skb_at_tc_ingress(const struct sk_buff * skb)735 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
736 {
737 #ifdef CONFIG_NET_XGRESS
738 return skb->tc_at_ingress;
739 #else
740 return false;
741 #endif
742 }
743
skb_skip_tc_classify(struct sk_buff * skb)744 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
745 {
746 #ifdef CONFIG_NET_CLS_ACT
747 if (skb->tc_skip_classify) {
748 skb->tc_skip_classify = 0;
749 return true;
750 }
751 #endif
752 return false;
753 }
754
755 /* Reset all TX qdiscs greater than index of a device. */
qdisc_reset_all_tx_gt(struct net_device * dev,unsigned int i)756 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
757 {
758 struct Qdisc *qdisc;
759
760 for (; i < dev->num_tx_queues; i++) {
761 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
762 if (qdisc) {
763 spin_lock_bh(qdisc_lock(qdisc));
764 qdisc_reset(qdisc);
765 spin_unlock_bh(qdisc_lock(qdisc));
766 }
767 }
768 }
769
770 /* Are all TX queues of the device empty? */
qdisc_all_tx_empty(const struct net_device * dev)771 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
772 {
773 unsigned int i;
774
775 rcu_read_lock();
776 for (i = 0; i < dev->num_tx_queues; i++) {
777 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
778 const struct Qdisc *q = rcu_dereference(txq->qdisc);
779
780 if (!qdisc_is_empty(q)) {
781 rcu_read_unlock();
782 return false;
783 }
784 }
785 rcu_read_unlock();
786 return true;
787 }
788
789 /* Are any of the TX qdiscs changing? */
qdisc_tx_changing(const struct net_device * dev)790 static inline bool qdisc_tx_changing(const struct net_device *dev)
791 {
792 unsigned int i;
793
794 for (i = 0; i < dev->num_tx_queues; i++) {
795 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
796
797 if (rcu_access_pointer(txq->qdisc) !=
798 rcu_access_pointer(txq->qdisc_sleeping))
799 return true;
800 }
801 return false;
802 }
803
804 /* Is the device using the noop qdisc on all queues? */
qdisc_tx_is_noop(const struct net_device * dev)805 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
806 {
807 unsigned int i;
808
809 for (i = 0; i < dev->num_tx_queues; i++) {
810 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
811 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
812 return false;
813 }
814 return true;
815 }
816
qdisc_pkt_len(const struct sk_buff * skb)817 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
818 {
819 return qdisc_skb_cb(skb)->pkt_len;
820 }
821
822 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
823 enum net_xmit_qdisc_t {
824 __NET_XMIT_STOLEN = 0x00010000,
825 __NET_XMIT_BYPASS = 0x00020000,
826 };
827
828 #ifdef CONFIG_NET_CLS_ACT
829 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
830 #else
831 #define net_xmit_drop_count(e) (1)
832 #endif
833
qdisc_calculate_pkt_len(struct sk_buff * skb,const struct Qdisc * sch)834 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
835 const struct Qdisc *sch)
836 {
837 #ifdef CONFIG_NET_SCHED
838 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
839
840 if (stab)
841 __qdisc_calculate_pkt_len(skb, stab);
842 #endif
843 }
844
qdisc_enqueue(struct sk_buff * skb,struct Qdisc * sch,struct sk_buff ** to_free)845 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
846 struct sk_buff **to_free)
847 {
848 return sch->enqueue(skb, sch, to_free);
849 }
850
_bstats_update(struct gnet_stats_basic_sync * bstats,__u64 bytes,__u64 packets)851 static inline void _bstats_update(struct gnet_stats_basic_sync *bstats,
852 __u64 bytes, __u64 packets)
853 {
854 u64_stats_update_begin(&bstats->syncp);
855 u64_stats_add(&bstats->bytes, bytes);
856 u64_stats_add(&bstats->packets, packets);
857 u64_stats_update_end(&bstats->syncp);
858 }
859
bstats_update(struct gnet_stats_basic_sync * bstats,const struct sk_buff * skb)860 static inline void bstats_update(struct gnet_stats_basic_sync *bstats,
861 const struct sk_buff *skb)
862 {
863 _bstats_update(bstats,
864 qdisc_pkt_len(skb),
865 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
866 }
867
qdisc_bstats_cpu_update(struct Qdisc * sch,const struct sk_buff * skb)868 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
869 const struct sk_buff *skb)
870 {
871 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb);
872 }
873
qdisc_bstats_update(struct Qdisc * sch,const struct sk_buff * skb)874 static inline void qdisc_bstats_update(struct Qdisc *sch,
875 const struct sk_buff *skb)
876 {
877 bstats_update(&sch->bstats, skb);
878 }
879
qdisc_qstats_backlog_dec(struct Qdisc * sch,const struct sk_buff * skb)880 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
881 const struct sk_buff *skb)
882 {
883 sch->qstats.backlog -= qdisc_pkt_len(skb);
884 }
885
qdisc_qstats_cpu_backlog_dec(struct Qdisc * sch,const struct sk_buff * skb)886 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
887 const struct sk_buff *skb)
888 {
889 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
890 }
891
qdisc_qstats_backlog_inc(struct Qdisc * sch,const struct sk_buff * skb)892 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
893 const struct sk_buff *skb)
894 {
895 sch->qstats.backlog += qdisc_pkt_len(skb);
896 }
897
qdisc_qstats_cpu_backlog_inc(struct Qdisc * sch,const struct sk_buff * skb)898 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
899 const struct sk_buff *skb)
900 {
901 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
902 }
903
qdisc_qstats_cpu_qlen_inc(struct Qdisc * sch)904 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
905 {
906 this_cpu_inc(sch->cpu_qstats->qlen);
907 }
908
qdisc_qstats_cpu_qlen_dec(struct Qdisc * sch)909 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
910 {
911 this_cpu_dec(sch->cpu_qstats->qlen);
912 }
913
qdisc_qstats_cpu_requeues_inc(struct Qdisc * sch)914 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
915 {
916 this_cpu_inc(sch->cpu_qstats->requeues);
917 }
918
__qdisc_qstats_drop(struct Qdisc * sch,int count)919 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
920 {
921 sch->qstats.drops += count;
922 }
923
qstats_drop_inc(struct gnet_stats_queue * qstats)924 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
925 {
926 qstats->drops++;
927 }
928
qstats_overlimit_inc(struct gnet_stats_queue * qstats)929 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
930 {
931 qstats->overlimits++;
932 }
933
qdisc_qstats_drop(struct Qdisc * sch)934 static inline void qdisc_qstats_drop(struct Qdisc *sch)
935 {
936 qstats_drop_inc(&sch->qstats);
937 }
938
qdisc_qstats_cpu_drop(struct Qdisc * sch)939 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
940 {
941 this_cpu_inc(sch->cpu_qstats->drops);
942 }
943
qdisc_qstats_overlimit(struct Qdisc * sch)944 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
945 {
946 sch->qstats.overlimits++;
947 }
948
qdisc_qstats_copy(struct gnet_dump * d,struct Qdisc * sch)949 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
950 {
951 __u32 qlen = qdisc_qlen_sum(sch);
952
953 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
954 }
955
qdisc_qstats_qlen_backlog(struct Qdisc * sch,__u32 * qlen,__u32 * backlog)956 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
957 __u32 *backlog)
958 {
959 struct gnet_stats_queue qstats = { 0 };
960
961 gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats);
962 *qlen = qstats.qlen + qdisc_qlen(sch);
963 *backlog = qstats.backlog;
964 }
965
qdisc_tree_flush_backlog(struct Qdisc * sch)966 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
967 {
968 __u32 qlen, backlog;
969
970 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
971 qdisc_tree_reduce_backlog(sch, qlen, backlog);
972 }
973
qdisc_purge_queue(struct Qdisc * sch)974 static inline void qdisc_purge_queue(struct Qdisc *sch)
975 {
976 __u32 qlen, backlog;
977
978 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
979 qdisc_reset(sch);
980 qdisc_tree_reduce_backlog(sch, qlen, backlog);
981 }
982
__qdisc_enqueue_tail(struct sk_buff * skb,struct qdisc_skb_head * qh)983 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
984 struct qdisc_skb_head *qh)
985 {
986 struct sk_buff *last = qh->tail;
987
988 if (last) {
989 skb->next = NULL;
990 last->next = skb;
991 qh->tail = skb;
992 } else {
993 qh->tail = skb;
994 qh->head = skb;
995 }
996 qh->qlen++;
997 }
998
qdisc_enqueue_tail(struct sk_buff * skb,struct Qdisc * sch)999 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
1000 {
1001 __qdisc_enqueue_tail(skb, &sch->q);
1002 qdisc_qstats_backlog_inc(sch, skb);
1003 return NET_XMIT_SUCCESS;
1004 }
1005
__qdisc_enqueue_head(struct sk_buff * skb,struct qdisc_skb_head * qh)1006 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
1007 struct qdisc_skb_head *qh)
1008 {
1009 skb->next = qh->head;
1010
1011 if (!qh->head)
1012 qh->tail = skb;
1013 qh->head = skb;
1014 qh->qlen++;
1015 }
1016
__qdisc_dequeue_head(struct qdisc_skb_head * qh)1017 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
1018 {
1019 struct sk_buff *skb = qh->head;
1020
1021 if (likely(skb != NULL)) {
1022 qh->head = skb->next;
1023 qh->qlen--;
1024 if (qh->head == NULL)
1025 qh->tail = NULL;
1026 skb->next = NULL;
1027 }
1028
1029 return skb;
1030 }
1031
qdisc_dequeue_internal(struct Qdisc * sch,bool direct)1032 static inline struct sk_buff *qdisc_dequeue_internal(struct Qdisc *sch, bool direct)
1033 {
1034 struct sk_buff *skb;
1035
1036 skb = __skb_dequeue(&sch->gso_skb);
1037 if (skb) {
1038 sch->q.qlen--;
1039 return skb;
1040 }
1041 if (direct)
1042 return __qdisc_dequeue_head(&sch->q);
1043 else
1044 return sch->dequeue(sch);
1045 }
1046
qdisc_dequeue_head(struct Qdisc * sch)1047 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1048 {
1049 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1050
1051 if (likely(skb != NULL)) {
1052 qdisc_qstats_backlog_dec(sch, skb);
1053 qdisc_bstats_update(sch, skb);
1054 }
1055
1056 return skb;
1057 }
1058
1059 /* Instead of calling kfree_skb() while root qdisc lock is held,
1060 * queue the skb for future freeing at end of __dev_xmit_skb()
1061 */
__qdisc_drop(struct sk_buff * skb,struct sk_buff ** to_free)1062 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1063 {
1064 skb->next = *to_free;
1065 *to_free = skb;
1066 }
1067
__qdisc_drop_all(struct sk_buff * skb,struct sk_buff ** to_free)1068 static inline void __qdisc_drop_all(struct sk_buff *skb,
1069 struct sk_buff **to_free)
1070 {
1071 if (skb->prev)
1072 skb->prev->next = *to_free;
1073 else
1074 skb->next = *to_free;
1075 *to_free = skb;
1076 }
1077
__qdisc_queue_drop_head(struct Qdisc * sch,struct qdisc_skb_head * qh,struct sk_buff ** to_free)1078 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1079 struct qdisc_skb_head *qh,
1080 struct sk_buff **to_free)
1081 {
1082 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1083
1084 if (likely(skb != NULL)) {
1085 unsigned int len = qdisc_pkt_len(skb);
1086
1087 qdisc_qstats_backlog_dec(sch, skb);
1088 __qdisc_drop(skb, to_free);
1089 return len;
1090 }
1091
1092 return 0;
1093 }
1094
qdisc_peek_head(struct Qdisc * sch)1095 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1096 {
1097 const struct qdisc_skb_head *qh = &sch->q;
1098
1099 return qh->head;
1100 }
1101
1102 /* generic pseudo peek method for non-work-conserving qdisc */
qdisc_peek_dequeued(struct Qdisc * sch)1103 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1104 {
1105 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1106
1107 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1108 if (!skb) {
1109 skb = sch->dequeue(sch);
1110
1111 if (skb) {
1112 __skb_queue_head(&sch->gso_skb, skb);
1113 /* it's still part of the queue */
1114 qdisc_qstats_backlog_inc(sch, skb);
1115 sch->q.qlen++;
1116 }
1117 }
1118
1119 return skb;
1120 }
1121
qdisc_update_stats_at_dequeue(struct Qdisc * sch,struct sk_buff * skb)1122 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1123 struct sk_buff *skb)
1124 {
1125 if (qdisc_is_percpu_stats(sch)) {
1126 qdisc_qstats_cpu_backlog_dec(sch, skb);
1127 qdisc_bstats_cpu_update(sch, skb);
1128 qdisc_qstats_cpu_qlen_dec(sch);
1129 } else {
1130 qdisc_qstats_backlog_dec(sch, skb);
1131 qdisc_bstats_update(sch, skb);
1132 sch->q.qlen--;
1133 }
1134 }
1135
qdisc_update_stats_at_enqueue(struct Qdisc * sch,unsigned int pkt_len)1136 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1137 unsigned int pkt_len)
1138 {
1139 if (qdisc_is_percpu_stats(sch)) {
1140 qdisc_qstats_cpu_qlen_inc(sch);
1141 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1142 } else {
1143 sch->qstats.backlog += pkt_len;
1144 sch->q.qlen++;
1145 }
1146 }
1147
1148 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
qdisc_dequeue_peeked(struct Qdisc * sch)1149 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1150 {
1151 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1152
1153 if (skb) {
1154 skb = __skb_dequeue(&sch->gso_skb);
1155 if (qdisc_is_percpu_stats(sch)) {
1156 qdisc_qstats_cpu_backlog_dec(sch, skb);
1157 qdisc_qstats_cpu_qlen_dec(sch);
1158 } else {
1159 qdisc_qstats_backlog_dec(sch, skb);
1160 sch->q.qlen--;
1161 }
1162 } else {
1163 skb = sch->dequeue(sch);
1164 }
1165
1166 return skb;
1167 }
1168
__qdisc_reset_queue(struct qdisc_skb_head * qh)1169 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1170 {
1171 /*
1172 * We do not know the backlog in bytes of this list, it
1173 * is up to the caller to correct it
1174 */
1175 ASSERT_RTNL();
1176 if (qh->qlen) {
1177 rtnl_kfree_skbs(qh->head, qh->tail);
1178
1179 qh->head = NULL;
1180 qh->tail = NULL;
1181 qh->qlen = 0;
1182 }
1183 }
1184
qdisc_reset_queue(struct Qdisc * sch)1185 static inline void qdisc_reset_queue(struct Qdisc *sch)
1186 {
1187 __qdisc_reset_queue(&sch->q);
1188 }
1189
qdisc_replace(struct Qdisc * sch,struct Qdisc * new,struct Qdisc ** pold)1190 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1191 struct Qdisc **pold)
1192 {
1193 struct Qdisc *old;
1194
1195 sch_tree_lock(sch);
1196 old = *pold;
1197 *pold = new;
1198 if (old != NULL)
1199 qdisc_purge_queue(old);
1200 sch_tree_unlock(sch);
1201
1202 return old;
1203 }
1204
rtnl_qdisc_drop(struct sk_buff * skb,struct Qdisc * sch)1205 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1206 {
1207 rtnl_kfree_skbs(skb, skb);
1208 qdisc_qstats_drop(sch);
1209 }
1210
qdisc_drop_cpu(struct sk_buff * skb,struct Qdisc * sch,struct sk_buff ** to_free)1211 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1212 struct sk_buff **to_free)
1213 {
1214 __qdisc_drop(skb, to_free);
1215 qdisc_qstats_cpu_drop(sch);
1216
1217 return NET_XMIT_DROP;
1218 }
1219
qdisc_drop(struct sk_buff * skb,struct Qdisc * sch,struct sk_buff ** to_free)1220 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1221 struct sk_buff **to_free)
1222 {
1223 __qdisc_drop(skb, to_free);
1224 qdisc_qstats_drop(sch);
1225
1226 return NET_XMIT_DROP;
1227 }
1228
qdisc_drop_all(struct sk_buff * skb,struct Qdisc * sch,struct sk_buff ** to_free)1229 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1230 struct sk_buff **to_free)
1231 {
1232 __qdisc_drop_all(skb, to_free);
1233 qdisc_qstats_drop(sch);
1234
1235 return NET_XMIT_DROP;
1236 }
1237
1238 struct psched_ratecfg {
1239 u64 rate_bytes_ps; /* bytes per second */
1240 u32 mult;
1241 u16 overhead;
1242 u16 mpu;
1243 u8 linklayer;
1244 u8 shift;
1245 };
1246
psched_l2t_ns(const struct psched_ratecfg * r,unsigned int len)1247 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1248 unsigned int len)
1249 {
1250 len += r->overhead;
1251
1252 if (len < r->mpu)
1253 len = r->mpu;
1254
1255 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1256 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1257
1258 return ((u64)len * r->mult) >> r->shift;
1259 }
1260
1261 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1262 const struct tc_ratespec *conf,
1263 u64 rate64);
1264
psched_ratecfg_getrate(struct tc_ratespec * res,const struct psched_ratecfg * r)1265 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1266 const struct psched_ratecfg *r)
1267 {
1268 memset(res, 0, sizeof(*res));
1269
1270 /* legacy struct tc_ratespec has a 32bit @rate field
1271 * Qdisc using 64bit rate should add new attributes
1272 * in order to maintain compatibility.
1273 */
1274 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1275
1276 res->overhead = r->overhead;
1277 res->mpu = r->mpu;
1278 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1279 }
1280
1281 struct psched_pktrate {
1282 u64 rate_pkts_ps; /* packets per second */
1283 u32 mult;
1284 u8 shift;
1285 };
1286
psched_pkt2t_ns(const struct psched_pktrate * r,unsigned int pkt_num)1287 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r,
1288 unsigned int pkt_num)
1289 {
1290 return ((u64)pkt_num * r->mult) >> r->shift;
1291 }
1292
1293 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64);
1294
1295 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1296 * The fast path only needs to access filter list and to update stats
1297 */
1298 struct mini_Qdisc {
1299 struct tcf_proto *filter_list;
1300 struct tcf_block *block;
1301 struct gnet_stats_basic_sync __percpu *cpu_bstats;
1302 struct gnet_stats_queue __percpu *cpu_qstats;
1303 unsigned long rcu_state;
1304 };
1305
mini_qdisc_bstats_cpu_update(struct mini_Qdisc * miniq,const struct sk_buff * skb)1306 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1307 const struct sk_buff *skb)
1308 {
1309 bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1310 }
1311
mini_qdisc_qstats_cpu_drop(struct mini_Qdisc * miniq)1312 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1313 {
1314 this_cpu_inc(miniq->cpu_qstats->drops);
1315 }
1316
1317 struct mini_Qdisc_pair {
1318 struct mini_Qdisc miniq1;
1319 struct mini_Qdisc miniq2;
1320 struct mini_Qdisc __rcu **p_miniq;
1321 };
1322
1323 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1324 struct tcf_proto *tp_head);
1325 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1326 struct mini_Qdisc __rcu **p_miniq);
1327 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1328 struct tcf_block *block);
1329
1330 void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx);
1331
1332 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));
1333
1334 /* Make sure qdisc is no longer in SCHED state. */
qdisc_synchronize(const struct Qdisc * q)1335 static inline void qdisc_synchronize(const struct Qdisc *q)
1336 {
1337 while (test_bit(__QDISC_STATE_SCHED, &q->state))
1338 msleep(1);
1339 }
1340
1341 #endif
1342