1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __NET_SCHED_GENERIC_H
3 #define __NET_SCHED_GENERIC_H
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>
23 typedef int tc_setup_cb_t(enum tc_setup_type type,
24 void *type_data, void *cb_priv);
26 struct qdisc_rate_table {
27 struct tc_ratespec rate;
29 struct qdisc_rate_table *next;
35 __QDISC_STATE_DEACTIVATED,
38 struct qdisc_size_table {
40 struct list_head list;
41 struct tc_sizespec szopts;
46 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
47 struct qdisc_skb_head {
55 int (*enqueue)(struct sk_buff *skb,
57 struct sk_buff **to_free);
58 struct sk_buff * (*dequeue)(struct Qdisc *sch);
60 #define TCQ_F_BUILTIN 1
61 #define TCQ_F_INGRESS 2
62 #define TCQ_F_CAN_BYPASS 4
63 #define TCQ_F_MQROOT 8
64 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
65 * q->dev_queue : It can test
66 * netif_xmit_frozen_or_stopped() before
67 * dequeueing next packet.
68 * Its true for MQ/MQPRIO slaves, or non
71 #define TCQ_F_WARN_NONWC (1 << 16)
72 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
73 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
74 * qdisc_tree_decrease_qlen() should stop.
76 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
77 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
78 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
80 const struct Qdisc_ops *ops;
81 struct qdisc_size_table __rcu *stab;
82 struct hlist_node hash;
86 struct netdev_queue *dev_queue;
88 struct net_rate_estimator __rcu *rate_est;
89 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
90 struct gnet_stats_queue __percpu *cpu_qstats;
95 * For performance sake on SMP, we put highly modified fields at the end
97 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
98 struct qdisc_skb_head q;
99 struct gnet_stats_basic_packed bstats;
101 struct gnet_stats_queue qstats;
103 struct Qdisc *next_sched;
104 struct sk_buff_head skb_bad_txq;
106 spinlock_t busylock ____cacheline_aligned_in_smp;
110 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
112 if (qdisc->flags & TCQ_F_BUILTIN)
114 refcount_inc(&qdisc->refcnt);
117 static inline bool qdisc_is_running(struct Qdisc *qdisc)
119 if (qdisc->flags & TCQ_F_NOLOCK)
120 return spin_is_locked(&qdisc->seqlock);
121 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
124 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
126 if (qdisc->flags & TCQ_F_NOLOCK) {
127 if (!spin_trylock(&qdisc->seqlock))
129 } else if (qdisc_is_running(qdisc)) {
132 /* Variant of write_seqcount_begin() telling lockdep a trylock
135 raw_write_seqcount_begin(&qdisc->running);
136 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
140 static inline void qdisc_run_end(struct Qdisc *qdisc)
142 write_seqcount_end(&qdisc->running);
143 if (qdisc->flags & TCQ_F_NOLOCK)
144 spin_unlock(&qdisc->seqlock);
147 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
149 return qdisc->flags & TCQ_F_ONETXQUEUE;
152 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
155 /* Non-BQL migrated drivers will return 0, too. */
156 return dql_avail(&txq->dql);
162 struct Qdisc_class_ops {
163 /* Child qdisc manipulation */
164 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
165 int (*graft)(struct Qdisc *, unsigned long cl,
166 struct Qdisc *, struct Qdisc **,
167 struct netlink_ext_ack *extack);
168 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
169 void (*qlen_notify)(struct Qdisc *, unsigned long);
171 /* Class manipulation routines */
172 unsigned long (*find)(struct Qdisc *, u32 classid);
173 int (*change)(struct Qdisc *, u32, u32,
174 struct nlattr **, unsigned long *,
175 struct netlink_ext_ack *);
176 int (*delete)(struct Qdisc *, unsigned long);
177 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
179 /* Filter manipulation */
180 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
182 struct netlink_ext_ack *extack);
183 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
185 void (*unbind_tcf)(struct Qdisc *, unsigned long);
187 /* rtnetlink specific */
188 int (*dump)(struct Qdisc *, unsigned long,
189 struct sk_buff *skb, struct tcmsg*);
190 int (*dump_stats)(struct Qdisc *, unsigned long,
195 struct Qdisc_ops *next;
196 const struct Qdisc_class_ops *cl_ops;
199 unsigned int static_flags;
201 int (*enqueue)(struct sk_buff *skb,
203 struct sk_buff **to_free);
204 struct sk_buff * (*dequeue)(struct Qdisc *);
205 struct sk_buff * (*peek)(struct Qdisc *);
207 int (*init)(struct Qdisc *sch, struct nlattr *arg,
208 struct netlink_ext_ack *extack);
209 void (*reset)(struct Qdisc *);
210 void (*destroy)(struct Qdisc *);
211 int (*change)(struct Qdisc *sch,
213 struct netlink_ext_ack *extack);
214 void (*attach)(struct Qdisc *sch);
215 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
217 int (*dump)(struct Qdisc *, struct sk_buff *);
218 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
220 void (*ingress_block_set)(struct Qdisc *sch,
222 void (*egress_block_set)(struct Qdisc *sch,
224 u32 (*ingress_block_get)(struct Qdisc *sch);
225 u32 (*egress_block_get)(struct Qdisc *sch);
227 struct module *owner;
237 const struct tcf_proto *goto_tp;
241 struct tcf_proto_ops {
242 struct list_head head;
245 int (*classify)(struct sk_buff *,
246 const struct tcf_proto *,
247 struct tcf_result *);
248 int (*init)(struct tcf_proto*);
249 void (*destroy)(struct tcf_proto *tp,
250 struct netlink_ext_ack *extack);
252 void* (*get)(struct tcf_proto*, u32 handle);
253 int (*change)(struct net *net, struct sk_buff *,
254 struct tcf_proto*, unsigned long,
255 u32 handle, struct nlattr **,
257 struct netlink_ext_ack *);
258 int (*delete)(struct tcf_proto *tp, void *arg,
260 struct netlink_ext_ack *);
261 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
262 int (*reoffload)(struct tcf_proto *tp, bool add,
263 tc_setup_cb_t *cb, void *cb_priv,
264 struct netlink_ext_ack *extack);
265 void (*bind_class)(void *, u32, unsigned long);
267 /* rtnetlink specific */
268 int (*dump)(struct net*, struct tcf_proto*, void *,
269 struct sk_buff *skb, struct tcmsg*);
271 struct module *owner;
275 /* Fast access part */
276 struct tcf_proto __rcu *next;
278 int (*classify)(struct sk_buff *,
279 const struct tcf_proto *,
280 struct tcf_result *);
286 const struct tcf_proto_ops *ops;
287 struct tcf_chain *chain;
291 struct qdisc_skb_cb {
292 unsigned int pkt_len;
293 u16 slave_dev_queue_mapping;
295 #define QDISC_CB_PRIV_LEN 20
296 unsigned char data[QDISC_CB_PRIV_LEN];
299 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
302 struct tcf_proto __rcu *filter_chain;
303 struct list_head list;
304 struct tcf_block *block;
305 u32 index; /* chain index */
310 struct list_head chain_list;
311 u32 index; /* block index for shared blocks */
315 struct list_head cb_list;
316 struct list_head owner_list;
318 unsigned int offloadcnt; /* Number of oddloaded filters */
319 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
321 struct tcf_chain *chain;
322 struct list_head filter_chain_list;
326 static inline void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
328 if (*flags & TCA_CLS_FLAGS_IN_HW)
330 *flags |= TCA_CLS_FLAGS_IN_HW;
334 static inline void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
336 if (!(*flags & TCA_CLS_FLAGS_IN_HW))
338 *flags &= ~TCA_CLS_FLAGS_IN_HW;
343 tc_cls_offload_cnt_update(struct tcf_block *block, unsigned int *cnt,
344 u32 *flags, bool add)
348 tcf_block_offload_inc(block, flags);
353 tcf_block_offload_dec(block, flags);
357 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
359 struct qdisc_skb_cb *qcb;
361 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
362 BUILD_BUG_ON(sizeof(qcb->data) < sz);
365 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
367 return this_cpu_ptr(q->cpu_qstats)->qlen;
370 static inline int qdisc_qlen(const struct Qdisc *q)
375 static inline int qdisc_qlen_sum(const struct Qdisc *q)
377 __u32 qlen = q->qstats.qlen;
380 if (q->flags & TCQ_F_NOLOCK) {
381 for_each_possible_cpu(i)
382 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
390 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
392 return (struct qdisc_skb_cb *)skb->cb;
395 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
397 return &qdisc->q.lock;
400 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
402 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
407 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
409 return qdisc->dev_queue->qdisc_sleeping;
412 /* The qdisc root lock is a mechanism by which to top level
413 * of a qdisc tree can be locked from any qdisc node in the
414 * forest. This allows changing the configuration of some
415 * aspect of the qdisc tree while blocking out asynchronous
416 * qdisc access in the packet processing paths.
418 * It is only legal to do this when the root will not change
419 * on us. Otherwise we'll potentially lock the wrong qdisc
420 * root. This is enforced by holding the RTNL semaphore, which
421 * all users of this lock accessor must do.
423 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
425 struct Qdisc *root = qdisc_root(qdisc);
428 return qdisc_lock(root);
431 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
433 struct Qdisc *root = qdisc_root_sleeping(qdisc);
436 return qdisc_lock(root);
439 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
441 struct Qdisc *root = qdisc_root_sleeping(qdisc);
444 return &root->running;
447 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
449 return qdisc->dev_queue->dev;
452 static inline void sch_tree_lock(const struct Qdisc *q)
454 spin_lock_bh(qdisc_root_sleeping_lock(q));
457 static inline void sch_tree_unlock(const struct Qdisc *q)
459 spin_unlock_bh(qdisc_root_sleeping_lock(q));
462 extern struct Qdisc noop_qdisc;
463 extern struct Qdisc_ops noop_qdisc_ops;
464 extern struct Qdisc_ops pfifo_fast_ops;
465 extern struct Qdisc_ops mq_qdisc_ops;
466 extern struct Qdisc_ops noqueue_qdisc_ops;
467 extern const struct Qdisc_ops *default_qdisc_ops;
468 static inline const struct Qdisc_ops *
469 get_default_qdisc_ops(const struct net_device *dev, int ntx)
471 return ntx < dev->real_num_tx_queues ?
472 default_qdisc_ops : &pfifo_fast_ops;
475 struct Qdisc_class_common {
477 struct hlist_node hnode;
480 struct Qdisc_class_hash {
481 struct hlist_head *hash;
482 unsigned int hashsize;
483 unsigned int hashmask;
484 unsigned int hashelems;
487 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
494 static inline struct Qdisc_class_common *
495 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
497 struct Qdisc_class_common *cl;
503 h = qdisc_class_hash(id, hash->hashmask);
504 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
505 if (cl->classid == id)
511 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
513 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
515 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
518 int qdisc_class_hash_init(struct Qdisc_class_hash *);
519 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
520 struct Qdisc_class_common *);
521 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
522 struct Qdisc_class_common *);
523 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
524 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
526 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
527 void dev_init_scheduler(struct net_device *dev);
528 void dev_shutdown(struct net_device *dev);
529 void dev_activate(struct net_device *dev);
530 void dev_deactivate(struct net_device *dev);
531 void dev_deactivate_many(struct list_head *head);
532 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
533 struct Qdisc *qdisc);
534 void qdisc_reset(struct Qdisc *qdisc);
535 void qdisc_destroy(struct Qdisc *qdisc);
536 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
538 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
539 const struct Qdisc_ops *ops,
540 struct netlink_ext_ack *extack);
541 void qdisc_free(struct Qdisc *qdisc);
542 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
543 const struct Qdisc_ops *ops, u32 parentid,
544 struct netlink_ext_ack *extack);
545 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
546 const struct qdisc_size_table *stab);
547 int skb_do_redirect(struct sk_buff *);
549 static inline void skb_reset_tc(struct sk_buff *skb)
551 #ifdef CONFIG_NET_CLS_ACT
552 skb->tc_redirected = 0;
556 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
558 #ifdef CONFIG_NET_CLS_ACT
559 return skb->tc_at_ingress;
565 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
567 #ifdef CONFIG_NET_CLS_ACT
568 if (skb->tc_skip_classify) {
569 skb->tc_skip_classify = 0;
576 /* Reset all TX qdiscs greater than index of a device. */
577 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
581 for (; i < dev->num_tx_queues; i++) {
582 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
584 spin_lock_bh(qdisc_lock(qdisc));
586 spin_unlock_bh(qdisc_lock(qdisc));
591 static inline void qdisc_reset_all_tx(struct net_device *dev)
593 qdisc_reset_all_tx_gt(dev, 0);
596 /* Are all TX queues of the device empty? */
597 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
602 for (i = 0; i < dev->num_tx_queues; i++) {
603 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
604 const struct Qdisc *q = rcu_dereference(txq->qdisc);
615 /* Are any of the TX qdiscs changing? */
616 static inline bool qdisc_tx_changing(const struct net_device *dev)
620 for (i = 0; i < dev->num_tx_queues; i++) {
621 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
622 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
628 /* Is the device using the noop qdisc on all queues? */
629 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
633 for (i = 0; i < dev->num_tx_queues; i++) {
634 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
635 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
641 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
643 return qdisc_skb_cb(skb)->pkt_len;
646 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
647 enum net_xmit_qdisc_t {
648 __NET_XMIT_STOLEN = 0x00010000,
649 __NET_XMIT_BYPASS = 0x00020000,
652 #ifdef CONFIG_NET_CLS_ACT
653 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
655 #define net_xmit_drop_count(e) (1)
658 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
659 const struct Qdisc *sch)
661 #ifdef CONFIG_NET_SCHED
662 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
665 __qdisc_calculate_pkt_len(skb, stab);
669 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
670 struct sk_buff **to_free)
672 qdisc_calculate_pkt_len(skb, sch);
673 return sch->enqueue(skb, sch, to_free);
676 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
678 return q->flags & TCQ_F_CPUSTATS;
681 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
682 __u64 bytes, __u32 packets)
684 bstats->bytes += bytes;
685 bstats->packets += packets;
688 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
689 const struct sk_buff *skb)
691 _bstats_update(bstats,
693 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
696 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
697 __u64 bytes, __u32 packets)
699 u64_stats_update_begin(&bstats->syncp);
700 _bstats_update(&bstats->bstats, bytes, packets);
701 u64_stats_update_end(&bstats->syncp);
704 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
705 const struct sk_buff *skb)
707 u64_stats_update_begin(&bstats->syncp);
708 bstats_update(&bstats->bstats, skb);
709 u64_stats_update_end(&bstats->syncp);
712 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
713 const struct sk_buff *skb)
715 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
718 static inline void qdisc_bstats_update(struct Qdisc *sch,
719 const struct sk_buff *skb)
721 bstats_update(&sch->bstats, skb);
724 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
725 const struct sk_buff *skb)
727 sch->qstats.backlog -= qdisc_pkt_len(skb);
730 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
731 const struct sk_buff *skb)
733 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
736 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
737 const struct sk_buff *skb)
739 sch->qstats.backlog += qdisc_pkt_len(skb);
742 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
743 const struct sk_buff *skb)
745 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
748 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
750 this_cpu_inc(sch->cpu_qstats->qlen);
753 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
755 this_cpu_dec(sch->cpu_qstats->qlen);
758 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
760 this_cpu_inc(sch->cpu_qstats->requeues);
763 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
765 sch->qstats.drops += count;
768 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
773 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
775 qstats->overlimits++;
778 static inline void qdisc_qstats_drop(struct Qdisc *sch)
780 qstats_drop_inc(&sch->qstats);
783 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
785 this_cpu_inc(sch->cpu_qstats->drops);
788 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
790 sch->qstats.overlimits++;
793 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
800 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
801 struct qdisc_skb_head *qh)
803 struct sk_buff *last = qh->tail;
814 qdisc_qstats_backlog_inc(sch, skb);
816 return NET_XMIT_SUCCESS;
819 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
821 return __qdisc_enqueue_tail(skb, sch, &sch->q);
824 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
826 struct sk_buff *skb = qh->head;
828 if (likely(skb != NULL)) {
829 qh->head = skb->next;
831 if (qh->head == NULL)
839 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
841 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
843 if (likely(skb != NULL)) {
844 qdisc_qstats_backlog_dec(sch, skb);
845 qdisc_bstats_update(sch, skb);
851 /* Instead of calling kfree_skb() while root qdisc lock is held,
852 * queue the skb for future freeing at end of __dev_xmit_skb()
854 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
856 skb->next = *to_free;
860 static inline void __qdisc_drop_all(struct sk_buff *skb,
861 struct sk_buff **to_free)
864 skb->prev->next = *to_free;
866 skb->next = *to_free;
870 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
871 struct qdisc_skb_head *qh,
872 struct sk_buff **to_free)
874 struct sk_buff *skb = __qdisc_dequeue_head(qh);
876 if (likely(skb != NULL)) {
877 unsigned int len = qdisc_pkt_len(skb);
879 qdisc_qstats_backlog_dec(sch, skb);
880 __qdisc_drop(skb, to_free);
887 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
888 struct sk_buff **to_free)
890 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
893 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
895 const struct qdisc_skb_head *qh = &sch->q;
900 /* generic pseudo peek method for non-work-conserving qdisc */
901 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
903 struct sk_buff *skb = skb_peek(&sch->gso_skb);
905 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
907 skb = sch->dequeue(sch);
910 __skb_queue_head(&sch->gso_skb, skb);
911 /* it's still part of the queue */
912 qdisc_qstats_backlog_inc(sch, skb);
920 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
921 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
923 struct sk_buff *skb = skb_peek(&sch->gso_skb);
926 skb = __skb_dequeue(&sch->gso_skb);
927 qdisc_qstats_backlog_dec(sch, skb);
930 skb = sch->dequeue(sch);
936 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
939 * We do not know the backlog in bytes of this list, it
940 * is up to the caller to correct it
944 rtnl_kfree_skbs(qh->head, qh->tail);
952 static inline void qdisc_reset_queue(struct Qdisc *sch)
954 __qdisc_reset_queue(&sch->q);
955 sch->qstats.backlog = 0;
958 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
967 unsigned int qlen = old->q.qlen;
968 unsigned int backlog = old->qstats.backlog;
971 qdisc_tree_reduce_backlog(old, qlen, backlog);
973 sch_tree_unlock(sch);
978 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
980 rtnl_kfree_skbs(skb, skb);
981 qdisc_qstats_drop(sch);
984 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
985 struct sk_buff **to_free)
987 __qdisc_drop(skb, to_free);
988 qdisc_qstats_cpu_drop(sch);
990 return NET_XMIT_DROP;
993 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
994 struct sk_buff **to_free)
996 __qdisc_drop(skb, to_free);
997 qdisc_qstats_drop(sch);
999 return NET_XMIT_DROP;
1002 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1003 struct sk_buff **to_free)
1005 __qdisc_drop_all(skb, to_free);
1006 qdisc_qstats_drop(sch);
1008 return NET_XMIT_DROP;
1011 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1012 long it will take to send a packet given its size.
1014 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1016 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1019 slot >>= rtab->rate.cell_log;
1021 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1022 return rtab->data[slot];
1025 struct psched_ratecfg {
1026 u64 rate_bytes_ps; /* bytes per second */
1033 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1038 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1039 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1041 return ((u64)len * r->mult) >> r->shift;
1044 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1045 const struct tc_ratespec *conf,
1048 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1049 const struct psched_ratecfg *r)
1051 memset(res, 0, sizeof(*res));
1053 /* legacy struct tc_ratespec has a 32bit @rate field
1054 * Qdisc using 64bit rate should add new attributes
1055 * in order to maintain compatibility.
1057 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1059 res->overhead = r->overhead;
1060 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1063 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1064 * The fast path only needs to access filter list and to update stats
1067 struct tcf_proto *filter_list;
1068 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1069 struct gnet_stats_queue __percpu *cpu_qstats;
1070 struct rcu_head rcu;
1073 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1074 const struct sk_buff *skb)
1076 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1079 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1081 this_cpu_inc(miniq->cpu_qstats->drops);
1084 struct mini_Qdisc_pair {
1085 struct mini_Qdisc miniq1;
1086 struct mini_Qdisc miniq2;
1087 struct mini_Qdisc __rcu **p_miniq;
1090 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1091 struct tcf_proto *tp_head);
1092 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1093 struct mini_Qdisc __rcu **p_miniq);