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 <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>
29 struct qdisc_rate_table {
30 struct tc_ratespec rate;
32 struct qdisc_rate_table *next;
38 __QDISC_STATE_DEACTIVATED,
41 struct qdisc_size_table {
43 struct list_head list;
44 struct tc_sizespec szopts;
49 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
50 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;
112 /* for NOLOCK qdisc, true if there are no enqueued skbs */
117 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
119 if (qdisc->flags & TCQ_F_BUILTIN)
121 refcount_inc(&qdisc->refcnt);
124 /* Intended to be used by unlocked users, when concurrent qdisc release is
128 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
130 if (qdisc->flags & TCQ_F_BUILTIN)
132 if (refcount_inc_not_zero(&qdisc->refcnt))
137 static inline bool qdisc_is_running(struct Qdisc *qdisc)
139 if (qdisc->flags & TCQ_F_NOLOCK)
140 return spin_is_locked(&qdisc->seqlock);
141 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
144 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
146 return q->flags & TCQ_F_CPUSTATS;
149 static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
151 if (qdisc_is_percpu_stats(qdisc))
152 return READ_ONCE(qdisc->empty);
153 return !READ_ONCE(qdisc->q.qlen);
156 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
158 if (qdisc->flags & TCQ_F_NOLOCK) {
159 if (!spin_trylock(&qdisc->seqlock))
161 WRITE_ONCE(qdisc->empty, false);
162 } else if (qdisc_is_running(qdisc)) {
165 /* Variant of write_seqcount_begin() telling lockdep a trylock
168 raw_write_seqcount_begin(&qdisc->running);
169 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
173 static inline void qdisc_run_end(struct Qdisc *qdisc)
175 write_seqcount_end(&qdisc->running);
176 if (qdisc->flags & TCQ_F_NOLOCK)
177 spin_unlock(&qdisc->seqlock);
180 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
182 return qdisc->flags & TCQ_F_ONETXQUEUE;
185 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
188 /* Non-BQL migrated drivers will return 0, too. */
189 return dql_avail(&txq->dql);
195 struct Qdisc_class_ops {
197 /* Child qdisc manipulation */
198 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
199 int (*graft)(struct Qdisc *, unsigned long cl,
200 struct Qdisc *, struct Qdisc **,
201 struct netlink_ext_ack *extack);
202 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
203 void (*qlen_notify)(struct Qdisc *, unsigned long);
205 /* Class manipulation routines */
206 unsigned long (*find)(struct Qdisc *, u32 classid);
207 int (*change)(struct Qdisc *, u32, u32,
208 struct nlattr **, unsigned long *,
209 struct netlink_ext_ack *);
210 int (*delete)(struct Qdisc *, unsigned long);
211 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
213 /* Filter manipulation */
214 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
216 struct netlink_ext_ack *extack);
217 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
219 void (*unbind_tcf)(struct Qdisc *, unsigned long);
221 /* rtnetlink specific */
222 int (*dump)(struct Qdisc *, unsigned long,
223 struct sk_buff *skb, struct tcmsg*);
224 int (*dump_stats)(struct Qdisc *, unsigned long,
228 /* Qdisc_class_ops flag values */
230 /* Implements API that doesn't require rtnl lock */
231 enum qdisc_class_ops_flags {
232 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
236 struct Qdisc_ops *next;
237 const struct Qdisc_class_ops *cl_ops;
240 unsigned int static_flags;
242 int (*enqueue)(struct sk_buff *skb,
244 struct sk_buff **to_free);
245 struct sk_buff * (*dequeue)(struct Qdisc *);
246 struct sk_buff * (*peek)(struct Qdisc *);
248 int (*init)(struct Qdisc *sch, struct nlattr *arg,
249 struct netlink_ext_ack *extack);
250 void (*reset)(struct Qdisc *);
251 void (*destroy)(struct Qdisc *);
252 int (*change)(struct Qdisc *sch,
254 struct netlink_ext_ack *extack);
255 void (*attach)(struct Qdisc *sch);
256 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
258 int (*dump)(struct Qdisc *, struct sk_buff *);
259 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
261 void (*ingress_block_set)(struct Qdisc *sch,
263 void (*egress_block_set)(struct Qdisc *sch,
265 u32 (*ingress_block_get)(struct Qdisc *sch);
266 u32 (*egress_block_get)(struct Qdisc *sch);
268 struct module *owner;
278 const struct tcf_proto *goto_tp;
280 /* used in the skb_tc_reinsert function */
283 struct gnet_stats_queue *qstats;
290 struct tcf_proto_ops {
291 struct list_head head;
294 int (*classify)(struct sk_buff *,
295 const struct tcf_proto *,
296 struct tcf_result *);
297 int (*init)(struct tcf_proto*);
298 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
299 struct netlink_ext_ack *extack);
301 void* (*get)(struct tcf_proto*, u32 handle);
302 void (*put)(struct tcf_proto *tp, void *f);
303 int (*change)(struct net *net, struct sk_buff *,
304 struct tcf_proto*, unsigned long,
305 u32 handle, struct nlattr **,
307 struct netlink_ext_ack *);
308 int (*delete)(struct tcf_proto *tp, void *arg,
309 bool *last, bool rtnl_held,
310 struct netlink_ext_ack *);
311 bool (*delete_empty)(struct tcf_proto *tp);
312 void (*walk)(struct tcf_proto *tp,
313 struct tcf_walker *arg, bool rtnl_held);
314 int (*reoffload)(struct tcf_proto *tp, bool add,
315 flow_setup_cb_t *cb, void *cb_priv,
316 struct netlink_ext_ack *extack);
317 void (*hw_add)(struct tcf_proto *tp,
319 void (*hw_del)(struct tcf_proto *tp,
321 void (*bind_class)(void *, u32, unsigned long,
322 void *, unsigned long);
323 void * (*tmplt_create)(struct net *net,
324 struct tcf_chain *chain,
326 struct netlink_ext_ack *extack);
327 void (*tmplt_destroy)(void *tmplt_priv);
329 /* rtnetlink specific */
330 int (*dump)(struct net*, struct tcf_proto*, void *,
331 struct sk_buff *skb, struct tcmsg*,
333 int (*tmplt_dump)(struct sk_buff *skb,
337 struct module *owner;
341 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
342 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
343 * conditions can occur when filters are inserted/deleted simultaneously.
345 enum tcf_proto_ops_flags {
346 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
350 /* Fast access part */
351 struct tcf_proto __rcu *next;
354 /* called under RCU BH lock*/
355 int (*classify)(struct sk_buff *,
356 const struct tcf_proto *,
357 struct tcf_result *);
363 const struct tcf_proto_ops *ops;
364 struct tcf_chain *chain;
365 /* Lock protects tcf_proto shared state and can be used by unlocked
366 * classifiers to protect their private data.
372 struct hlist_node destroy_ht_node;
375 struct qdisc_skb_cb {
377 unsigned int pkt_len;
378 u16 slave_dev_queue_mapping;
381 #define QDISC_CB_PRIV_LEN 20
382 unsigned char data[QDISC_CB_PRIV_LEN];
385 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
388 /* Protects filter_chain. */
389 struct mutex filter_chain_lock;
390 struct tcf_proto __rcu *filter_chain;
391 struct list_head list;
392 struct tcf_block *block;
393 u32 index; /* chain index */
395 unsigned int action_refcnt;
396 bool explicitly_created;
398 const struct tcf_proto_ops *tmplt_ops;
404 /* Lock protects tcf_block and lifetime-management data of chains
405 * attached to the block (refcnt, action_refcnt, explicitly_created).
408 struct list_head chain_list;
409 u32 index; /* block index for shared blocks */
413 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
414 struct flow_block flow_block;
415 struct list_head owner_list;
417 atomic_t offloadcnt; /* Number of oddloaded filters */
418 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
419 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
421 struct tcf_chain *chain;
422 struct list_head filter_chain_list;
425 DECLARE_HASHTABLE(proto_destroy_ht, 7);
426 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
429 #ifdef CONFIG_PROVE_LOCKING
430 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
432 return lockdep_is_held(&chain->filter_chain_lock);
435 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
437 return lockdep_is_held(&tp->lock);
440 static inline bool lockdep_tcf_chain_is_locked(struct tcf_block *chain)
445 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
449 #endif /* #ifdef CONFIG_PROVE_LOCKING */
451 #define tcf_chain_dereference(p, chain) \
452 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
454 #define tcf_proto_dereference(p, tp) \
455 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
457 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
459 struct qdisc_skb_cb *qcb;
461 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
462 BUILD_BUG_ON(sizeof(qcb->data) < sz);
465 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
467 return this_cpu_ptr(q->cpu_qstats)->qlen;
470 static inline int qdisc_qlen(const struct Qdisc *q)
475 static inline int qdisc_qlen_sum(const struct Qdisc *q)
477 __u32 qlen = q->qstats.qlen;
480 if (qdisc_is_percpu_stats(q)) {
481 for_each_possible_cpu(i)
482 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
490 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
492 return (struct qdisc_skb_cb *)skb->cb;
495 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
497 return &qdisc->q.lock;
500 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
502 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
507 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
509 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
512 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
514 return qdisc->dev_queue->qdisc_sleeping;
517 /* The qdisc root lock is a mechanism by which to top level
518 * of a qdisc tree can be locked from any qdisc node in the
519 * forest. This allows changing the configuration of some
520 * aspect of the qdisc tree while blocking out asynchronous
521 * qdisc access in the packet processing paths.
523 * It is only legal to do this when the root will not change
524 * on us. Otherwise we'll potentially lock the wrong qdisc
525 * root. This is enforced by holding the RTNL semaphore, which
526 * all users of this lock accessor must do.
528 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
530 struct Qdisc *root = qdisc_root(qdisc);
533 return qdisc_lock(root);
536 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
538 struct Qdisc *root = qdisc_root_sleeping(qdisc);
541 return qdisc_lock(root);
544 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
546 struct Qdisc *root = qdisc_root_sleeping(qdisc);
549 return &root->running;
552 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
554 return qdisc->dev_queue->dev;
557 static inline void sch_tree_lock(const struct Qdisc *q)
559 spin_lock_bh(qdisc_root_sleeping_lock(q));
562 static inline void sch_tree_unlock(const struct Qdisc *q)
564 spin_unlock_bh(qdisc_root_sleeping_lock(q));
567 extern struct Qdisc noop_qdisc;
568 extern struct Qdisc_ops noop_qdisc_ops;
569 extern struct Qdisc_ops pfifo_fast_ops;
570 extern struct Qdisc_ops mq_qdisc_ops;
571 extern struct Qdisc_ops noqueue_qdisc_ops;
572 extern const struct Qdisc_ops *default_qdisc_ops;
573 static inline const struct Qdisc_ops *
574 get_default_qdisc_ops(const struct net_device *dev, int ntx)
576 return ntx < dev->real_num_tx_queues ?
577 default_qdisc_ops : &pfifo_fast_ops;
580 struct Qdisc_class_common {
582 struct hlist_node hnode;
585 struct Qdisc_class_hash {
586 struct hlist_head *hash;
587 unsigned int hashsize;
588 unsigned int hashmask;
589 unsigned int hashelems;
592 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
599 static inline struct Qdisc_class_common *
600 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
602 struct Qdisc_class_common *cl;
608 h = qdisc_class_hash(id, hash->hashmask);
609 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
610 if (cl->classid == id)
616 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
618 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
620 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
623 int qdisc_class_hash_init(struct Qdisc_class_hash *);
624 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
625 struct Qdisc_class_common *);
626 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
627 struct Qdisc_class_common *);
628 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
629 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
631 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
632 void dev_init_scheduler(struct net_device *dev);
633 void dev_shutdown(struct net_device *dev);
634 void dev_activate(struct net_device *dev);
635 void dev_deactivate(struct net_device *dev);
636 void dev_deactivate_many(struct list_head *head);
637 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
638 struct Qdisc *qdisc);
639 void qdisc_reset(struct Qdisc *qdisc);
640 void qdisc_put(struct Qdisc *qdisc);
641 void qdisc_put_unlocked(struct Qdisc *qdisc);
642 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
643 #ifdef CONFIG_NET_SCHED
644 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
646 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
647 struct Qdisc *new, struct Qdisc *old,
648 enum tc_setup_type type, void *type_data,
649 struct netlink_ext_ack *extack);
652 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
655 q->flags &= ~TCQ_F_OFFLOADED;
660 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
661 struct Qdisc *new, struct Qdisc *old,
662 enum tc_setup_type type, void *type_data,
663 struct netlink_ext_ack *extack)
667 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
668 const struct Qdisc_ops *ops,
669 struct netlink_ext_ack *extack);
670 void qdisc_free(struct Qdisc *qdisc);
671 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
672 const struct Qdisc_ops *ops, u32 parentid,
673 struct netlink_ext_ack *extack);
674 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
675 const struct qdisc_size_table *stab);
676 int skb_do_redirect(struct sk_buff *);
678 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
680 #ifdef CONFIG_NET_CLS_ACT
681 return skb->tc_at_ingress;
687 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
689 #ifdef CONFIG_NET_CLS_ACT
690 if (skb->tc_skip_classify) {
691 skb->tc_skip_classify = 0;
698 /* Reset all TX qdiscs greater than index of a device. */
699 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
703 for (; i < dev->num_tx_queues; i++) {
704 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
706 spin_lock_bh(qdisc_lock(qdisc));
708 spin_unlock_bh(qdisc_lock(qdisc));
713 static inline void qdisc_reset_all_tx(struct net_device *dev)
715 qdisc_reset_all_tx_gt(dev, 0);
718 /* Are all TX queues of the device empty? */
719 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
724 for (i = 0; i < dev->num_tx_queues; i++) {
725 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
726 const struct Qdisc *q = rcu_dereference(txq->qdisc);
728 if (!qdisc_is_empty(q)) {
737 /* Are any of the TX qdiscs changing? */
738 static inline bool qdisc_tx_changing(const struct net_device *dev)
742 for (i = 0; i < dev->num_tx_queues; i++) {
743 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
744 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
750 /* Is the device using the noop qdisc on all queues? */
751 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
755 for (i = 0; i < dev->num_tx_queues; i++) {
756 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
757 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
763 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
765 return qdisc_skb_cb(skb)->pkt_len;
768 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
769 enum net_xmit_qdisc_t {
770 __NET_XMIT_STOLEN = 0x00010000,
771 __NET_XMIT_BYPASS = 0x00020000,
774 #ifdef CONFIG_NET_CLS_ACT
775 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
777 #define net_xmit_drop_count(e) (1)
780 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
781 const struct Qdisc *sch)
783 #ifdef CONFIG_NET_SCHED
784 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
787 __qdisc_calculate_pkt_len(skb, stab);
791 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
792 struct sk_buff **to_free)
794 qdisc_calculate_pkt_len(skb, sch);
795 return sch->enqueue(skb, sch, to_free);
798 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
799 __u64 bytes, __u32 packets)
801 bstats->bytes += bytes;
802 bstats->packets += packets;
805 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
806 const struct sk_buff *skb)
808 _bstats_update(bstats,
810 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
813 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
814 __u64 bytes, __u32 packets)
816 u64_stats_update_begin(&bstats->syncp);
817 _bstats_update(&bstats->bstats, bytes, packets);
818 u64_stats_update_end(&bstats->syncp);
821 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
822 const struct sk_buff *skb)
824 u64_stats_update_begin(&bstats->syncp);
825 bstats_update(&bstats->bstats, skb);
826 u64_stats_update_end(&bstats->syncp);
829 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
830 const struct sk_buff *skb)
832 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
835 static inline void qdisc_bstats_update(struct Qdisc *sch,
836 const struct sk_buff *skb)
838 bstats_update(&sch->bstats, skb);
841 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
842 const struct sk_buff *skb)
844 sch->qstats.backlog -= qdisc_pkt_len(skb);
847 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
848 const struct sk_buff *skb)
850 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
853 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
854 const struct sk_buff *skb)
856 sch->qstats.backlog += qdisc_pkt_len(skb);
859 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
860 const struct sk_buff *skb)
862 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
865 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
867 this_cpu_inc(sch->cpu_qstats->qlen);
870 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
872 this_cpu_dec(sch->cpu_qstats->qlen);
875 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
877 this_cpu_inc(sch->cpu_qstats->requeues);
880 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
882 sch->qstats.drops += count;
885 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
890 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
892 qstats->overlimits++;
895 static inline void qdisc_qstats_drop(struct Qdisc *sch)
897 qstats_drop_inc(&sch->qstats);
900 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
902 this_cpu_inc(sch->cpu_qstats->drops);
905 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
907 sch->qstats.overlimits++;
910 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
912 __u32 qlen = qdisc_qlen_sum(sch);
914 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
917 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
920 struct gnet_stats_queue qstats = { 0 };
921 __u32 len = qdisc_qlen_sum(sch);
923 __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
925 *backlog = qstats.backlog;
928 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
932 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
933 qdisc_tree_reduce_backlog(sch, qlen, backlog);
936 static inline void qdisc_purge_queue(struct Qdisc *sch)
940 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
942 qdisc_tree_reduce_backlog(sch, qlen, backlog);
945 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
952 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
953 struct qdisc_skb_head *qh)
955 struct sk_buff *last = qh->tail;
968 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
970 __qdisc_enqueue_tail(skb, &sch->q);
971 qdisc_qstats_backlog_inc(sch, skb);
972 return NET_XMIT_SUCCESS;
975 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
976 struct qdisc_skb_head *qh)
978 skb->next = qh->head;
986 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
988 struct sk_buff *skb = qh->head;
990 if (likely(skb != NULL)) {
991 qh->head = skb->next;
993 if (qh->head == NULL)
1001 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1003 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1005 if (likely(skb != NULL)) {
1006 qdisc_qstats_backlog_dec(sch, skb);
1007 qdisc_bstats_update(sch, skb);
1013 /* Instead of calling kfree_skb() while root qdisc lock is held,
1014 * queue the skb for future freeing at end of __dev_xmit_skb()
1016 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1018 skb->next = *to_free;
1022 static inline void __qdisc_drop_all(struct sk_buff *skb,
1023 struct sk_buff **to_free)
1026 skb->prev->next = *to_free;
1028 skb->next = *to_free;
1032 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1033 struct qdisc_skb_head *qh,
1034 struct sk_buff **to_free)
1036 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1038 if (likely(skb != NULL)) {
1039 unsigned int len = qdisc_pkt_len(skb);
1041 qdisc_qstats_backlog_dec(sch, skb);
1042 __qdisc_drop(skb, to_free);
1049 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
1050 struct sk_buff **to_free)
1052 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
1055 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1057 const struct qdisc_skb_head *qh = &sch->q;
1062 /* generic pseudo peek method for non-work-conserving qdisc */
1063 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1065 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1067 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1069 skb = sch->dequeue(sch);
1072 __skb_queue_head(&sch->gso_skb, skb);
1073 /* it's still part of the queue */
1074 qdisc_qstats_backlog_inc(sch, skb);
1082 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1083 struct sk_buff *skb)
1085 if (qdisc_is_percpu_stats(sch)) {
1086 qdisc_qstats_cpu_backlog_dec(sch, skb);
1087 qdisc_bstats_cpu_update(sch, skb);
1088 qdisc_qstats_cpu_qlen_dec(sch);
1090 qdisc_qstats_backlog_dec(sch, skb);
1091 qdisc_bstats_update(sch, skb);
1096 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1097 unsigned int pkt_len)
1099 if (qdisc_is_percpu_stats(sch)) {
1100 qdisc_qstats_cpu_qlen_inc(sch);
1101 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1103 sch->qstats.backlog += pkt_len;
1108 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1109 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1111 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1114 skb = __skb_dequeue(&sch->gso_skb);
1115 if (qdisc_is_percpu_stats(sch)) {
1116 qdisc_qstats_cpu_backlog_dec(sch, skb);
1117 qdisc_qstats_cpu_qlen_dec(sch);
1119 qdisc_qstats_backlog_dec(sch, skb);
1123 skb = sch->dequeue(sch);
1129 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1132 * We do not know the backlog in bytes of this list, it
1133 * is up to the caller to correct it
1137 rtnl_kfree_skbs(qh->head, qh->tail);
1145 static inline void qdisc_reset_queue(struct Qdisc *sch)
1147 __qdisc_reset_queue(&sch->q);
1148 sch->qstats.backlog = 0;
1151 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1152 struct Qdisc **pold)
1160 qdisc_tree_flush_backlog(old);
1161 sch_tree_unlock(sch);
1166 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1168 rtnl_kfree_skbs(skb, skb);
1169 qdisc_qstats_drop(sch);
1172 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1173 struct sk_buff **to_free)
1175 __qdisc_drop(skb, to_free);
1176 qdisc_qstats_cpu_drop(sch);
1178 return NET_XMIT_DROP;
1181 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1182 struct sk_buff **to_free)
1184 __qdisc_drop(skb, to_free);
1185 qdisc_qstats_drop(sch);
1187 return NET_XMIT_DROP;
1190 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1191 struct sk_buff **to_free)
1193 __qdisc_drop_all(skb, to_free);
1194 qdisc_qstats_drop(sch);
1196 return NET_XMIT_DROP;
1199 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1200 long it will take to send a packet given its size.
1202 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1204 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1207 slot >>= rtab->rate.cell_log;
1209 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1210 return rtab->data[slot];
1213 struct psched_ratecfg {
1214 u64 rate_bytes_ps; /* bytes per second */
1221 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1226 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1227 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1229 return ((u64)len * r->mult) >> r->shift;
1232 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1233 const struct tc_ratespec *conf,
1236 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1237 const struct psched_ratecfg *r)
1239 memset(res, 0, sizeof(*res));
1241 /* legacy struct tc_ratespec has a 32bit @rate field
1242 * Qdisc using 64bit rate should add new attributes
1243 * in order to maintain compatibility.
1245 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1247 res->overhead = r->overhead;
1248 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1251 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1252 * The fast path only needs to access filter list and to update stats
1255 struct tcf_proto *filter_list;
1256 struct tcf_block *block;
1257 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1258 struct gnet_stats_queue __percpu *cpu_qstats;
1259 struct rcu_head rcu;
1262 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1263 const struct sk_buff *skb)
1265 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1268 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1270 this_cpu_inc(miniq->cpu_qstats->drops);
1273 struct mini_Qdisc_pair {
1274 struct mini_Qdisc miniq1;
1275 struct mini_Qdisc miniq2;
1276 struct mini_Qdisc __rcu **p_miniq;
1279 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1280 struct tcf_proto *tp_head);
1281 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1282 struct mini_Qdisc __rcu **p_miniq);
1283 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1284 struct tcf_block *block);
1286 static inline int skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res)
1288 return res->ingress ? netif_receive_skb(skb) : dev_queue_xmit(skb);