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 {
58 int (*enqueue)(struct sk_buff *skb,
60 struct sk_buff **to_free);
61 struct sk_buff * (*dequeue)(struct Qdisc *sch);
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
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.
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 */
83 const struct Qdisc_ops *ops;
84 struct qdisc_size_table __rcu *stab;
85 struct hlist_node hash;
89 struct netdev_queue *dev_queue;
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;
98 * For performance sake on SMP, we put highly modified fields at the end
100 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
101 struct qdisc_skb_head q;
102 struct gnet_stats_basic_packed bstats;
104 struct gnet_stats_queue qstats;
106 struct Qdisc *next_sched;
107 struct sk_buff_head skb_bad_txq;
109 spinlock_t busylock ____cacheline_aligned_in_smp;
113 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
115 if (qdisc->flags & TCQ_F_BUILTIN)
117 refcount_inc(&qdisc->refcnt);
120 static inline bool qdisc_is_running(struct Qdisc *qdisc)
122 if (qdisc->flags & TCQ_F_NOLOCK)
123 return spin_is_locked(&qdisc->seqlock);
124 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
127 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
129 if (qdisc->flags & TCQ_F_NOLOCK) {
130 if (!spin_trylock(&qdisc->seqlock))
132 } else if (qdisc_is_running(qdisc)) {
135 /* Variant of write_seqcount_begin() telling lockdep a trylock
138 raw_write_seqcount_begin(&qdisc->running);
139 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
143 static inline void qdisc_run_end(struct Qdisc *qdisc)
145 write_seqcount_end(&qdisc->running);
146 if (qdisc->flags & TCQ_F_NOLOCK)
147 spin_unlock(&qdisc->seqlock);
150 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
152 return qdisc->flags & TCQ_F_ONETXQUEUE;
155 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
158 /* Non-BQL migrated drivers will return 0, too. */
159 return dql_avail(&txq->dql);
165 struct Qdisc_class_ops {
166 /* Child qdisc manipulation */
167 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
168 int (*graft)(struct Qdisc *, unsigned long cl,
169 struct Qdisc *, struct Qdisc **,
170 struct netlink_ext_ack *extack);
171 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
172 void (*qlen_notify)(struct Qdisc *, unsigned long);
174 /* Class manipulation routines */
175 unsigned long (*find)(struct Qdisc *, u32 classid);
176 int (*change)(struct Qdisc *, u32, u32,
177 struct nlattr **, unsigned long *,
178 struct netlink_ext_ack *);
179 int (*delete)(struct Qdisc *, unsigned long);
180 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
182 /* Filter manipulation */
183 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
185 struct netlink_ext_ack *extack);
186 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
188 void (*unbind_tcf)(struct Qdisc *, unsigned long);
190 /* rtnetlink specific */
191 int (*dump)(struct Qdisc *, unsigned long,
192 struct sk_buff *skb, struct tcmsg*);
193 int (*dump_stats)(struct Qdisc *, unsigned long,
198 struct Qdisc_ops *next;
199 const struct Qdisc_class_ops *cl_ops;
202 unsigned int static_flags;
204 int (*enqueue)(struct sk_buff *skb,
206 struct sk_buff **to_free);
207 struct sk_buff * (*dequeue)(struct Qdisc *);
208 struct sk_buff * (*peek)(struct Qdisc *);
210 int (*init)(struct Qdisc *sch, struct nlattr *arg,
211 struct netlink_ext_ack *extack);
212 void (*reset)(struct Qdisc *);
213 void (*destroy)(struct Qdisc *);
214 int (*change)(struct Qdisc *sch,
216 struct netlink_ext_ack *extack);
217 void (*attach)(struct Qdisc *sch);
218 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
220 int (*dump)(struct Qdisc *, struct sk_buff *);
221 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
223 void (*ingress_block_set)(struct Qdisc *sch,
225 void (*egress_block_set)(struct Qdisc *sch,
227 u32 (*ingress_block_get)(struct Qdisc *sch);
228 u32 (*egress_block_get)(struct Qdisc *sch);
230 struct module *owner;
240 const struct tcf_proto *goto_tp;
242 /* used by the TC_ACT_REINSERT action */
245 struct gnet_stats_queue *qstats;
252 struct tcf_proto_ops {
253 struct list_head head;
256 int (*classify)(struct sk_buff *,
257 const struct tcf_proto *,
258 struct tcf_result *);
259 int (*init)(struct tcf_proto*);
260 void (*destroy)(struct tcf_proto *tp,
261 struct netlink_ext_ack *extack);
263 void* (*get)(struct tcf_proto*, u32 handle);
264 int (*change)(struct net *net, struct sk_buff *,
265 struct tcf_proto*, unsigned long,
266 u32 handle, struct nlattr **,
268 struct netlink_ext_ack *);
269 int (*delete)(struct tcf_proto *tp, void *arg,
271 struct netlink_ext_ack *);
272 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
273 int (*reoffload)(struct tcf_proto *tp, bool add,
274 tc_setup_cb_t *cb, void *cb_priv,
275 struct netlink_ext_ack *extack);
276 void (*bind_class)(void *, u32, unsigned long,
277 void *, unsigned long);
278 void * (*tmplt_create)(struct net *net,
279 struct tcf_chain *chain,
281 struct netlink_ext_ack *extack);
282 void (*tmplt_destroy)(void *tmplt_priv);
284 /* rtnetlink specific */
285 int (*dump)(struct net*, struct tcf_proto*, void *,
286 struct sk_buff *skb, struct tcmsg*);
287 int (*tmplt_dump)(struct sk_buff *skb,
291 struct module *owner;
295 /* Fast access part */
296 struct tcf_proto __rcu *next;
299 /* called under RCU BH lock*/
300 int (*classify)(struct sk_buff *,
301 const struct tcf_proto *,
302 struct tcf_result *);
308 const struct tcf_proto_ops *ops;
309 struct tcf_chain *chain;
313 struct qdisc_skb_cb {
314 unsigned int pkt_len;
315 u16 slave_dev_queue_mapping;
317 #define QDISC_CB_PRIV_LEN 20
318 unsigned char data[QDISC_CB_PRIV_LEN];
321 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
324 struct tcf_proto __rcu *filter_chain;
325 struct list_head list;
326 struct tcf_block *block;
327 u32 index; /* chain index */
329 unsigned int action_refcnt;
330 bool explicitly_created;
331 const struct tcf_proto_ops *tmplt_ops;
336 struct list_head chain_list;
337 u32 index; /* block index for shared blocks */
341 struct list_head cb_list;
342 struct list_head owner_list;
344 unsigned int offloadcnt; /* Number of oddloaded filters */
345 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
347 struct tcf_chain *chain;
348 struct list_head filter_chain_list;
352 static inline void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
354 if (*flags & TCA_CLS_FLAGS_IN_HW)
356 *flags |= TCA_CLS_FLAGS_IN_HW;
360 static inline void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
362 if (!(*flags & TCA_CLS_FLAGS_IN_HW))
364 *flags &= ~TCA_CLS_FLAGS_IN_HW;
369 tc_cls_offload_cnt_update(struct tcf_block *block, unsigned int *cnt,
370 u32 *flags, bool add)
374 tcf_block_offload_inc(block, flags);
379 tcf_block_offload_dec(block, flags);
383 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
385 struct qdisc_skb_cb *qcb;
387 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
388 BUILD_BUG_ON(sizeof(qcb->data) < sz);
391 static inline int qdisc_qlen(const struct Qdisc *q)
396 static inline u32 qdisc_qlen_sum(const struct Qdisc *q)
398 u32 qlen = q->qstats.qlen;
400 if (q->flags & TCQ_F_NOLOCK)
401 qlen += atomic_read(&q->q.atomic_qlen);
408 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
410 return (struct qdisc_skb_cb *)skb->cb;
413 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
415 return &qdisc->q.lock;
418 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
420 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
425 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
427 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
430 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
432 return qdisc->dev_queue->qdisc_sleeping;
435 /* The qdisc root lock is a mechanism by which to top level
436 * of a qdisc tree can be locked from any qdisc node in the
437 * forest. This allows changing the configuration of some
438 * aspect of the qdisc tree while blocking out asynchronous
439 * qdisc access in the packet processing paths.
441 * It is only legal to do this when the root will not change
442 * on us. Otherwise we'll potentially lock the wrong qdisc
443 * root. This is enforced by holding the RTNL semaphore, which
444 * all users of this lock accessor must do.
446 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
448 struct Qdisc *root = qdisc_root(qdisc);
451 return qdisc_lock(root);
454 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
456 struct Qdisc *root = qdisc_root_sleeping(qdisc);
459 return qdisc_lock(root);
462 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
464 struct Qdisc *root = qdisc_root_sleeping(qdisc);
467 return &root->running;
470 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
472 return qdisc->dev_queue->dev;
475 static inline void sch_tree_lock(const struct Qdisc *q)
477 spin_lock_bh(qdisc_root_sleeping_lock(q));
480 static inline void sch_tree_unlock(const struct Qdisc *q)
482 spin_unlock_bh(qdisc_root_sleeping_lock(q));
485 extern struct Qdisc noop_qdisc;
486 extern struct Qdisc_ops noop_qdisc_ops;
487 extern struct Qdisc_ops pfifo_fast_ops;
488 extern struct Qdisc_ops mq_qdisc_ops;
489 extern struct Qdisc_ops noqueue_qdisc_ops;
490 extern const struct Qdisc_ops *default_qdisc_ops;
491 static inline const struct Qdisc_ops *
492 get_default_qdisc_ops(const struct net_device *dev, int ntx)
494 return ntx < dev->real_num_tx_queues ?
495 default_qdisc_ops : &pfifo_fast_ops;
498 struct Qdisc_class_common {
500 struct hlist_node hnode;
503 struct Qdisc_class_hash {
504 struct hlist_head *hash;
505 unsigned int hashsize;
506 unsigned int hashmask;
507 unsigned int hashelems;
510 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
517 static inline struct Qdisc_class_common *
518 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
520 struct Qdisc_class_common *cl;
526 h = qdisc_class_hash(id, hash->hashmask);
527 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
528 if (cl->classid == id)
534 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
536 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
538 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
541 int qdisc_class_hash_init(struct Qdisc_class_hash *);
542 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
543 struct Qdisc_class_common *);
544 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
545 struct Qdisc_class_common *);
546 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
547 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
549 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
550 void dev_init_scheduler(struct net_device *dev);
551 void dev_shutdown(struct net_device *dev);
552 void dev_activate(struct net_device *dev);
553 void dev_deactivate(struct net_device *dev);
554 void dev_deactivate_many(struct list_head *head);
555 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
556 struct Qdisc *qdisc);
557 void qdisc_reset(struct Qdisc *qdisc);
558 void qdisc_destroy(struct Qdisc *qdisc);
559 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
561 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
562 const struct Qdisc_ops *ops,
563 struct netlink_ext_ack *extack);
564 void qdisc_free(struct Qdisc *qdisc);
565 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
566 const struct Qdisc_ops *ops, u32 parentid,
567 struct netlink_ext_ack *extack);
568 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
569 const struct qdisc_size_table *stab);
570 int skb_do_redirect(struct sk_buff *);
572 static inline void skb_reset_tc(struct sk_buff *skb)
574 #ifdef CONFIG_NET_CLS_ACT
575 skb->tc_redirected = 0;
579 static inline bool skb_is_tc_redirected(const struct sk_buff *skb)
581 #ifdef CONFIG_NET_CLS_ACT
582 return skb->tc_redirected;
588 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
590 #ifdef CONFIG_NET_CLS_ACT
591 return skb->tc_at_ingress;
597 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
599 #ifdef CONFIG_NET_CLS_ACT
600 if (skb->tc_skip_classify) {
601 skb->tc_skip_classify = 0;
608 /* Reset all TX qdiscs greater than index of a device. */
609 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
613 for (; i < dev->num_tx_queues; i++) {
614 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
616 spin_lock_bh(qdisc_lock(qdisc));
618 spin_unlock_bh(qdisc_lock(qdisc));
623 static inline void qdisc_reset_all_tx(struct net_device *dev)
625 qdisc_reset_all_tx_gt(dev, 0);
628 /* Are all TX queues of the device empty? */
629 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
634 for (i = 0; i < dev->num_tx_queues; i++) {
635 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
636 const struct Qdisc *q = rcu_dereference(txq->qdisc);
647 /* Are any of the TX qdiscs changing? */
648 static inline bool qdisc_tx_changing(const struct net_device *dev)
652 for (i = 0; i < dev->num_tx_queues; i++) {
653 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
654 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
660 /* Is the device using the noop qdisc on all queues? */
661 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
665 for (i = 0; i < dev->num_tx_queues; i++) {
666 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
667 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
673 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
675 return qdisc_skb_cb(skb)->pkt_len;
678 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
679 enum net_xmit_qdisc_t {
680 __NET_XMIT_STOLEN = 0x00010000,
681 __NET_XMIT_BYPASS = 0x00020000,
684 #ifdef CONFIG_NET_CLS_ACT
685 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
687 #define net_xmit_drop_count(e) (1)
690 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
691 const struct Qdisc *sch)
693 #ifdef CONFIG_NET_SCHED
694 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
697 __qdisc_calculate_pkt_len(skb, stab);
701 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
702 struct sk_buff **to_free)
704 qdisc_calculate_pkt_len(skb, sch);
705 return sch->enqueue(skb, sch, to_free);
708 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
710 return q->flags & TCQ_F_CPUSTATS;
713 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
714 __u64 bytes, __u32 packets)
716 bstats->bytes += bytes;
717 bstats->packets += packets;
720 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
721 const struct sk_buff *skb)
723 _bstats_update(bstats,
725 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
728 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
729 __u64 bytes, __u32 packets)
731 u64_stats_update_begin(&bstats->syncp);
732 _bstats_update(&bstats->bstats, bytes, packets);
733 u64_stats_update_end(&bstats->syncp);
736 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
737 const struct sk_buff *skb)
739 u64_stats_update_begin(&bstats->syncp);
740 bstats_update(&bstats->bstats, skb);
741 u64_stats_update_end(&bstats->syncp);
744 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
745 const struct sk_buff *skb)
747 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
750 static inline void qdisc_bstats_update(struct Qdisc *sch,
751 const struct sk_buff *skb)
753 bstats_update(&sch->bstats, skb);
756 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
757 const struct sk_buff *skb)
759 sch->qstats.backlog -= qdisc_pkt_len(skb);
762 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
763 const struct sk_buff *skb)
765 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
768 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
769 const struct sk_buff *skb)
771 sch->qstats.backlog += qdisc_pkt_len(skb);
774 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
775 const struct sk_buff *skb)
777 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
780 static inline void qdisc_qstats_atomic_qlen_inc(struct Qdisc *sch)
782 atomic_inc(&sch->q.atomic_qlen);
785 static inline void qdisc_qstats_atomic_qlen_dec(struct Qdisc *sch)
787 atomic_dec(&sch->q.atomic_qlen);
790 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
792 this_cpu_inc(sch->cpu_qstats->requeues);
795 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
797 sch->qstats.drops += count;
800 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
805 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
807 qstats->overlimits++;
810 static inline void qdisc_qstats_drop(struct Qdisc *sch)
812 qstats_drop_inc(&sch->qstats);
815 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
817 this_cpu_inc(sch->cpu_qstats->drops);
820 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
822 sch->qstats.overlimits++;
825 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
832 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
833 struct qdisc_skb_head *qh)
835 struct sk_buff *last = qh->tail;
846 qdisc_qstats_backlog_inc(sch, skb);
848 return NET_XMIT_SUCCESS;
851 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
853 return __qdisc_enqueue_tail(skb, sch, &sch->q);
856 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
858 struct sk_buff *skb = qh->head;
860 if (likely(skb != NULL)) {
861 qh->head = skb->next;
863 if (qh->head == NULL)
871 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
873 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
875 if (likely(skb != NULL)) {
876 qdisc_qstats_backlog_dec(sch, skb);
877 qdisc_bstats_update(sch, skb);
883 /* Instead of calling kfree_skb() while root qdisc lock is held,
884 * queue the skb for future freeing at end of __dev_xmit_skb()
886 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
888 skb->next = *to_free;
892 static inline void __qdisc_drop_all(struct sk_buff *skb,
893 struct sk_buff **to_free)
896 skb->prev->next = *to_free;
898 skb->next = *to_free;
902 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
903 struct qdisc_skb_head *qh,
904 struct sk_buff **to_free)
906 struct sk_buff *skb = __qdisc_dequeue_head(qh);
908 if (likely(skb != NULL)) {
909 unsigned int len = qdisc_pkt_len(skb);
911 qdisc_qstats_backlog_dec(sch, skb);
912 __qdisc_drop(skb, to_free);
919 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
920 struct sk_buff **to_free)
922 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
925 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
927 const struct qdisc_skb_head *qh = &sch->q;
932 /* generic pseudo peek method for non-work-conserving qdisc */
933 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
935 struct sk_buff *skb = skb_peek(&sch->gso_skb);
937 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
939 skb = sch->dequeue(sch);
942 __skb_queue_head(&sch->gso_skb, skb);
943 /* it's still part of the queue */
944 qdisc_qstats_backlog_inc(sch, skb);
952 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
953 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
955 struct sk_buff *skb = skb_peek(&sch->gso_skb);
958 skb = __skb_dequeue(&sch->gso_skb);
959 qdisc_qstats_backlog_dec(sch, skb);
962 skb = sch->dequeue(sch);
968 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
971 * We do not know the backlog in bytes of this list, it
972 * is up to the caller to correct it
976 rtnl_kfree_skbs(qh->head, qh->tail);
984 static inline void qdisc_reset_queue(struct Qdisc *sch)
986 __qdisc_reset_queue(&sch->q);
987 sch->qstats.backlog = 0;
990 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
999 unsigned int qlen = old->q.qlen;
1000 unsigned int backlog = old->qstats.backlog;
1003 qdisc_tree_reduce_backlog(old, qlen, backlog);
1005 sch_tree_unlock(sch);
1010 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1012 rtnl_kfree_skbs(skb, skb);
1013 qdisc_qstats_drop(sch);
1016 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1017 struct sk_buff **to_free)
1019 __qdisc_drop(skb, to_free);
1020 qdisc_qstats_cpu_drop(sch);
1022 return NET_XMIT_DROP;
1025 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1026 struct sk_buff **to_free)
1028 __qdisc_drop(skb, to_free);
1029 qdisc_qstats_drop(sch);
1031 return NET_XMIT_DROP;
1034 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1035 struct sk_buff **to_free)
1037 __qdisc_drop_all(skb, to_free);
1038 qdisc_qstats_drop(sch);
1040 return NET_XMIT_DROP;
1043 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1044 long it will take to send a packet given its size.
1046 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1048 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1051 slot >>= rtab->rate.cell_log;
1053 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1054 return rtab->data[slot];
1057 struct psched_ratecfg {
1058 u64 rate_bytes_ps; /* bytes per second */
1065 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1070 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1071 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1073 return ((u64)len * r->mult) >> r->shift;
1076 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1077 const struct tc_ratespec *conf,
1080 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1081 const struct psched_ratecfg *r)
1083 memset(res, 0, sizeof(*res));
1085 /* legacy struct tc_ratespec has a 32bit @rate field
1086 * Qdisc using 64bit rate should add new attributes
1087 * in order to maintain compatibility.
1089 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1091 res->overhead = r->overhead;
1092 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1095 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1096 * The fast path only needs to access filter list and to update stats
1099 struct tcf_proto *filter_list;
1100 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1101 struct gnet_stats_queue __percpu *cpu_qstats;
1102 struct rcu_head rcu;
1105 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1106 const struct sk_buff *skb)
1108 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1111 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1113 this_cpu_inc(miniq->cpu_qstats->drops);
1116 struct mini_Qdisc_pair {
1117 struct mini_Qdisc miniq1;
1118 struct mini_Qdisc miniq2;
1119 struct mini_Qdisc __rcu **p_miniq;
1122 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1123 struct tcf_proto *tp_head);
1124 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1125 struct mini_Qdisc __rcu **p_miniq);
1127 static inline void skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res)
1129 struct gnet_stats_queue *stats = res->qstats;
1133 ret = netif_receive_skb(skb);
1135 ret = dev_queue_xmit(skb);
1137 qstats_overlimit_inc(res->qstats);