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,
42 struct qdisc_size_table {
44 struct list_head list;
45 struct tc_sizespec szopts;
50 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
51 struct qdisc_skb_head {
59 int (*enqueue)(struct sk_buff *skb,
61 struct sk_buff **to_free);
62 struct sk_buff * (*dequeue)(struct Qdisc *sch);
64 #define TCQ_F_BUILTIN 1
65 #define TCQ_F_INGRESS 2
66 #define TCQ_F_CAN_BYPASS 4
67 #define TCQ_F_MQROOT 8
68 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
69 * q->dev_queue : It can test
70 * netif_xmit_frozen_or_stopped() before
71 * dequeueing next packet.
72 * Its true for MQ/MQPRIO slaves, or non
75 #define TCQ_F_WARN_NONWC (1 << 16)
76 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
77 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
78 * qdisc_tree_decrease_qlen() should stop.
80 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
81 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
82 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
84 const struct Qdisc_ops *ops;
85 struct qdisc_size_table __rcu *stab;
86 struct hlist_node hash;
90 struct netdev_queue *dev_queue;
92 struct net_rate_estimator __rcu *rate_est;
93 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
94 struct gnet_stats_queue __percpu *cpu_qstats;
99 * For performance sake on SMP, we put highly modified fields at the end
101 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
102 struct qdisc_skb_head q;
103 struct gnet_stats_basic_packed bstats;
105 struct gnet_stats_queue qstats;
107 struct Qdisc *next_sched;
108 struct sk_buff_head skb_bad_txq;
110 spinlock_t busylock ____cacheline_aligned_in_smp;
113 /* for NOLOCK qdisc, true if there are no enqueued skbs */
118 long privdata[] ____cacheline_aligned;
121 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
123 if (qdisc->flags & TCQ_F_BUILTIN)
125 refcount_inc(&qdisc->refcnt);
128 /* Intended to be used by unlocked users, when concurrent qdisc release is
132 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
134 if (qdisc->flags & TCQ_F_BUILTIN)
136 if (refcount_inc_not_zero(&qdisc->refcnt))
141 static inline bool qdisc_is_running(struct Qdisc *qdisc)
143 if (qdisc->flags & TCQ_F_NOLOCK)
144 return spin_is_locked(&qdisc->seqlock);
145 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
148 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
150 return q->flags & TCQ_F_CPUSTATS;
153 static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
155 if (qdisc_is_percpu_stats(qdisc))
156 return READ_ONCE(qdisc->empty);
157 return !READ_ONCE(qdisc->q.qlen);
160 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
162 if (qdisc->flags & TCQ_F_NOLOCK) {
163 if (spin_trylock(&qdisc->seqlock))
166 /* If the MISSED flag is set, it means other thread has
167 * set the MISSED flag before second spin_trylock(), so
168 * we can return false here to avoid multi cpus doing
169 * the set_bit() and second spin_trylock() concurrently.
171 if (test_bit(__QDISC_STATE_MISSED, &qdisc->state))
174 /* Set the MISSED flag before the second spin_trylock(),
175 * if the second spin_trylock() return false, it means
176 * other cpu holding the lock will do dequeuing for us
177 * or it will see the MISSED flag set after releasing
178 * lock and reschedule the net_tx_action() to do the
181 set_bit(__QDISC_STATE_MISSED, &qdisc->state);
183 /* Retry again in case other CPU may not see the new flag
184 * after it releases the lock at the end of qdisc_run_end().
186 if (!spin_trylock(&qdisc->seqlock))
190 WRITE_ONCE(qdisc->empty, false);
191 } else if (qdisc_is_running(qdisc)) {
194 /* Variant of write_seqcount_begin() telling lockdep a trylock
197 raw_write_seqcount_begin(&qdisc->running);
198 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
202 static inline void qdisc_run_end(struct Qdisc *qdisc)
204 write_seqcount_end(&qdisc->running);
205 if (qdisc->flags & TCQ_F_NOLOCK) {
206 spin_unlock(&qdisc->seqlock);
208 if (unlikely(test_bit(__QDISC_STATE_MISSED,
210 clear_bit(__QDISC_STATE_MISSED, &qdisc->state);
211 __netif_schedule(qdisc);
216 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
218 return qdisc->flags & TCQ_F_ONETXQUEUE;
221 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
224 /* Non-BQL migrated drivers will return 0, too. */
225 return dql_avail(&txq->dql);
231 struct Qdisc_class_ops {
233 /* Child qdisc manipulation */
234 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
235 int (*graft)(struct Qdisc *, unsigned long cl,
236 struct Qdisc *, struct Qdisc **,
237 struct netlink_ext_ack *extack);
238 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
239 void (*qlen_notify)(struct Qdisc *, unsigned long);
241 /* Class manipulation routines */
242 unsigned long (*find)(struct Qdisc *, u32 classid);
243 int (*change)(struct Qdisc *, u32, u32,
244 struct nlattr **, unsigned long *,
245 struct netlink_ext_ack *);
246 int (*delete)(struct Qdisc *, unsigned long,
247 struct netlink_ext_ack *);
248 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
250 /* Filter manipulation */
251 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
253 struct netlink_ext_ack *extack);
254 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
256 void (*unbind_tcf)(struct Qdisc *, unsigned long);
258 /* rtnetlink specific */
259 int (*dump)(struct Qdisc *, unsigned long,
260 struct sk_buff *skb, struct tcmsg*);
261 int (*dump_stats)(struct Qdisc *, unsigned long,
265 /* Qdisc_class_ops flag values */
267 /* Implements API that doesn't require rtnl lock */
268 enum qdisc_class_ops_flags {
269 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
273 struct Qdisc_ops *next;
274 const struct Qdisc_class_ops *cl_ops;
277 unsigned int static_flags;
279 int (*enqueue)(struct sk_buff *skb,
281 struct sk_buff **to_free);
282 struct sk_buff * (*dequeue)(struct Qdisc *);
283 struct sk_buff * (*peek)(struct Qdisc *);
285 int (*init)(struct Qdisc *sch, struct nlattr *arg,
286 struct netlink_ext_ack *extack);
287 void (*reset)(struct Qdisc *);
288 void (*destroy)(struct Qdisc *);
289 int (*change)(struct Qdisc *sch,
291 struct netlink_ext_ack *extack);
292 void (*attach)(struct Qdisc *sch);
293 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
295 int (*dump)(struct Qdisc *, struct sk_buff *);
296 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
298 void (*ingress_block_set)(struct Qdisc *sch,
300 void (*egress_block_set)(struct Qdisc *sch,
302 u32 (*ingress_block_get)(struct Qdisc *sch);
303 u32 (*egress_block_get)(struct Qdisc *sch);
305 struct module *owner;
315 const struct tcf_proto *goto_tp;
317 /* used in the skb_tc_reinsert function */
320 struct gnet_stats_queue *qstats;
327 struct tcf_proto_ops {
328 struct list_head head;
331 int (*classify)(struct sk_buff *,
332 const struct tcf_proto *,
333 struct tcf_result *);
334 int (*init)(struct tcf_proto*);
335 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
336 struct netlink_ext_ack *extack);
338 void* (*get)(struct tcf_proto*, u32 handle);
339 void (*put)(struct tcf_proto *tp, void *f);
340 int (*change)(struct net *net, struct sk_buff *,
341 struct tcf_proto*, unsigned long,
342 u32 handle, struct nlattr **,
344 struct netlink_ext_ack *);
345 int (*delete)(struct tcf_proto *tp, void *arg,
346 bool *last, bool rtnl_held,
347 struct netlink_ext_ack *);
348 bool (*delete_empty)(struct tcf_proto *tp);
349 void (*walk)(struct tcf_proto *tp,
350 struct tcf_walker *arg, bool rtnl_held);
351 int (*reoffload)(struct tcf_proto *tp, bool add,
352 flow_setup_cb_t *cb, void *cb_priv,
353 struct netlink_ext_ack *extack);
354 void (*hw_add)(struct tcf_proto *tp,
356 void (*hw_del)(struct tcf_proto *tp,
358 void (*bind_class)(void *, u32, unsigned long,
359 void *, unsigned long);
360 void * (*tmplt_create)(struct net *net,
361 struct tcf_chain *chain,
363 struct netlink_ext_ack *extack);
364 void (*tmplt_destroy)(void *tmplt_priv);
366 /* rtnetlink specific */
367 int (*dump)(struct net*, struct tcf_proto*, void *,
368 struct sk_buff *skb, struct tcmsg*,
370 int (*terse_dump)(struct net *net,
371 struct tcf_proto *tp, void *fh,
373 struct tcmsg *t, bool rtnl_held);
374 int (*tmplt_dump)(struct sk_buff *skb,
378 struct module *owner;
382 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
383 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
384 * conditions can occur when filters are inserted/deleted simultaneously.
386 enum tcf_proto_ops_flags {
387 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
391 /* Fast access part */
392 struct tcf_proto __rcu *next;
395 /* called under RCU BH lock*/
396 int (*classify)(struct sk_buff *,
397 const struct tcf_proto *,
398 struct tcf_result *);
404 const struct tcf_proto_ops *ops;
405 struct tcf_chain *chain;
406 /* Lock protects tcf_proto shared state and can be used by unlocked
407 * classifiers to protect their private data.
413 struct hlist_node destroy_ht_node;
416 struct qdisc_skb_cb {
418 unsigned int pkt_len;
419 u16 slave_dev_queue_mapping;
422 #define QDISC_CB_PRIV_LEN 20
423 unsigned char data[QDISC_CB_PRIV_LEN];
428 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
431 /* Protects filter_chain. */
432 struct mutex filter_chain_lock;
433 struct tcf_proto __rcu *filter_chain;
434 struct list_head list;
435 struct tcf_block *block;
436 u32 index; /* chain index */
438 unsigned int action_refcnt;
439 bool explicitly_created;
441 const struct tcf_proto_ops *tmplt_ops;
447 /* Lock protects tcf_block and lifetime-management data of chains
448 * attached to the block (refcnt, action_refcnt, explicitly_created).
451 struct list_head chain_list;
452 u32 index; /* block index for shared blocks */
453 u32 classid; /* which class this block belongs to */
457 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
458 struct flow_block flow_block;
459 struct list_head owner_list;
461 atomic_t offloadcnt; /* Number of oddloaded filters */
462 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
463 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
465 struct tcf_chain *chain;
466 struct list_head filter_chain_list;
469 DECLARE_HASHTABLE(proto_destroy_ht, 7);
470 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
473 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
475 return lockdep_is_held(&chain->filter_chain_lock);
478 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
480 return lockdep_is_held(&tp->lock);
483 #define tcf_chain_dereference(p, chain) \
484 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
486 #define tcf_proto_dereference(p, tp) \
487 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
489 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
491 struct qdisc_skb_cb *qcb;
493 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb));
494 BUILD_BUG_ON(sizeof(qcb->data) < sz);
497 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
499 return this_cpu_ptr(q->cpu_qstats)->qlen;
502 static inline int qdisc_qlen(const struct Qdisc *q)
507 static inline int qdisc_qlen_sum(const struct Qdisc *q)
509 __u32 qlen = q->qstats.qlen;
512 if (qdisc_is_percpu_stats(q)) {
513 for_each_possible_cpu(i)
514 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
522 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
524 return (struct qdisc_skb_cb *)skb->cb;
527 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
529 return &qdisc->q.lock;
532 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
534 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
539 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
541 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
544 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
546 return qdisc->dev_queue->qdisc_sleeping;
549 /* The qdisc root lock is a mechanism by which to top level
550 * of a qdisc tree can be locked from any qdisc node in the
551 * forest. This allows changing the configuration of some
552 * aspect of the qdisc tree while blocking out asynchronous
553 * qdisc access in the packet processing paths.
555 * It is only legal to do this when the root will not change
556 * on us. Otherwise we'll potentially lock the wrong qdisc
557 * root. This is enforced by holding the RTNL semaphore, which
558 * all users of this lock accessor must do.
560 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
562 struct Qdisc *root = qdisc_root(qdisc);
565 return qdisc_lock(root);
568 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
570 struct Qdisc *root = qdisc_root_sleeping(qdisc);
573 return qdisc_lock(root);
576 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
578 struct Qdisc *root = qdisc_root_sleeping(qdisc);
581 return &root->running;
584 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
586 return qdisc->dev_queue->dev;
589 static inline void sch_tree_lock(struct Qdisc *q)
591 if (q->flags & TCQ_F_MQROOT)
592 spin_lock_bh(qdisc_lock(q));
594 spin_lock_bh(qdisc_root_sleeping_lock(q));
597 static inline void sch_tree_unlock(struct Qdisc *q)
599 if (q->flags & TCQ_F_MQROOT)
600 spin_unlock_bh(qdisc_lock(q));
602 spin_unlock_bh(qdisc_root_sleeping_lock(q));
605 extern struct Qdisc noop_qdisc;
606 extern struct Qdisc_ops noop_qdisc_ops;
607 extern struct Qdisc_ops pfifo_fast_ops;
608 extern struct Qdisc_ops mq_qdisc_ops;
609 extern struct Qdisc_ops noqueue_qdisc_ops;
610 extern const struct Qdisc_ops *default_qdisc_ops;
611 static inline const struct Qdisc_ops *
612 get_default_qdisc_ops(const struct net_device *dev, int ntx)
614 return ntx < dev->real_num_tx_queues ?
615 default_qdisc_ops : &pfifo_fast_ops;
618 struct Qdisc_class_common {
620 struct hlist_node hnode;
623 struct Qdisc_class_hash {
624 struct hlist_head *hash;
625 unsigned int hashsize;
626 unsigned int hashmask;
627 unsigned int hashelems;
630 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
637 static inline struct Qdisc_class_common *
638 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
640 struct Qdisc_class_common *cl;
646 h = qdisc_class_hash(id, hash->hashmask);
647 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
648 if (cl->classid == id)
654 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
656 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
658 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
661 int qdisc_class_hash_init(struct Qdisc_class_hash *);
662 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
663 struct Qdisc_class_common *);
664 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
665 struct Qdisc_class_common *);
666 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
667 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
669 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
670 void dev_init_scheduler(struct net_device *dev);
671 void dev_shutdown(struct net_device *dev);
672 void dev_activate(struct net_device *dev);
673 void dev_deactivate(struct net_device *dev);
674 void dev_deactivate_many(struct list_head *head);
675 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
676 struct Qdisc *qdisc);
677 void qdisc_reset(struct Qdisc *qdisc);
678 void qdisc_put(struct Qdisc *qdisc);
679 void qdisc_put_unlocked(struct Qdisc *qdisc);
680 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
681 #ifdef CONFIG_NET_SCHED
682 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
684 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
685 struct Qdisc *new, struct Qdisc *old,
686 enum tc_setup_type type, void *type_data,
687 struct netlink_ext_ack *extack);
690 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
693 q->flags &= ~TCQ_F_OFFLOADED;
698 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
699 struct Qdisc *new, struct Qdisc *old,
700 enum tc_setup_type type, void *type_data,
701 struct netlink_ext_ack *extack)
705 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
706 const struct Qdisc_ops *ops,
707 struct netlink_ext_ack *extack);
708 void qdisc_free(struct Qdisc *qdisc);
709 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
710 const struct Qdisc_ops *ops, u32 parentid,
711 struct netlink_ext_ack *extack);
712 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
713 const struct qdisc_size_table *stab);
714 int skb_do_redirect(struct sk_buff *);
716 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
718 #ifdef CONFIG_NET_CLS_ACT
719 return skb->tc_at_ingress;
725 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
727 #ifdef CONFIG_NET_CLS_ACT
728 if (skb->tc_skip_classify) {
729 skb->tc_skip_classify = 0;
736 /* Reset all TX qdiscs greater than index of a device. */
737 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
741 for (; i < dev->num_tx_queues; i++) {
742 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
744 spin_lock_bh(qdisc_lock(qdisc));
746 spin_unlock_bh(qdisc_lock(qdisc));
751 /* Are all TX queues of the device empty? */
752 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
757 for (i = 0; i < dev->num_tx_queues; i++) {
758 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
759 const struct Qdisc *q = rcu_dereference(txq->qdisc);
761 if (!qdisc_is_empty(q)) {
770 /* Are any of the TX qdiscs changing? */
771 static inline bool qdisc_tx_changing(const struct net_device *dev)
775 for (i = 0; i < dev->num_tx_queues; i++) {
776 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
777 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
783 /* Is the device using the noop qdisc on all queues? */
784 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
788 for (i = 0; i < dev->num_tx_queues; i++) {
789 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
790 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
796 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
798 return qdisc_skb_cb(skb)->pkt_len;
801 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
802 enum net_xmit_qdisc_t {
803 __NET_XMIT_STOLEN = 0x00010000,
804 __NET_XMIT_BYPASS = 0x00020000,
807 #ifdef CONFIG_NET_CLS_ACT
808 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
810 #define net_xmit_drop_count(e) (1)
813 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
814 const struct Qdisc *sch)
816 #ifdef CONFIG_NET_SCHED
817 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
820 __qdisc_calculate_pkt_len(skb, stab);
824 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
825 struct sk_buff **to_free)
827 qdisc_calculate_pkt_len(skb, sch);
828 return sch->enqueue(skb, sch, to_free);
831 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
832 __u64 bytes, __u32 packets)
834 bstats->bytes += bytes;
835 bstats->packets += packets;
838 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
839 const struct sk_buff *skb)
841 _bstats_update(bstats,
843 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
846 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
847 __u64 bytes, __u32 packets)
849 u64_stats_update_begin(&bstats->syncp);
850 _bstats_update(&bstats->bstats, bytes, packets);
851 u64_stats_update_end(&bstats->syncp);
854 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
855 const struct sk_buff *skb)
857 u64_stats_update_begin(&bstats->syncp);
858 bstats_update(&bstats->bstats, skb);
859 u64_stats_update_end(&bstats->syncp);
862 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
863 const struct sk_buff *skb)
865 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
868 static inline void qdisc_bstats_update(struct Qdisc *sch,
869 const struct sk_buff *skb)
871 bstats_update(&sch->bstats, skb);
874 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
875 const struct sk_buff *skb)
877 sch->qstats.backlog -= qdisc_pkt_len(skb);
880 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
881 const struct sk_buff *skb)
883 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
886 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
887 const struct sk_buff *skb)
889 sch->qstats.backlog += qdisc_pkt_len(skb);
892 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
893 const struct sk_buff *skb)
895 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
898 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
900 this_cpu_inc(sch->cpu_qstats->qlen);
903 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
905 this_cpu_dec(sch->cpu_qstats->qlen);
908 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
910 this_cpu_inc(sch->cpu_qstats->requeues);
913 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
915 sch->qstats.drops += count;
918 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
923 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
925 qstats->overlimits++;
928 static inline void qdisc_qstats_drop(struct Qdisc *sch)
930 qstats_drop_inc(&sch->qstats);
933 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
935 this_cpu_inc(sch->cpu_qstats->drops);
938 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
940 sch->qstats.overlimits++;
943 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
945 __u32 qlen = qdisc_qlen_sum(sch);
947 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
950 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
953 struct gnet_stats_queue qstats = { 0 };
954 __u32 len = qdisc_qlen_sum(sch);
956 __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
958 *backlog = qstats.backlog;
961 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
965 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
966 qdisc_tree_reduce_backlog(sch, qlen, backlog);
969 static inline void qdisc_purge_queue(struct Qdisc *sch)
973 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
975 qdisc_tree_reduce_backlog(sch, qlen, backlog);
978 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
985 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
986 struct qdisc_skb_head *qh)
988 struct sk_buff *last = qh->tail;
1001 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
1003 __qdisc_enqueue_tail(skb, &sch->q);
1004 qdisc_qstats_backlog_inc(sch, skb);
1005 return NET_XMIT_SUCCESS;
1008 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
1009 struct qdisc_skb_head *qh)
1011 skb->next = qh->head;
1019 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
1021 struct sk_buff *skb = qh->head;
1023 if (likely(skb != NULL)) {
1024 qh->head = skb->next;
1026 if (qh->head == NULL)
1034 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1036 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1038 if (likely(skb != NULL)) {
1039 qdisc_qstats_backlog_dec(sch, skb);
1040 qdisc_bstats_update(sch, skb);
1046 /* Instead of calling kfree_skb() while root qdisc lock is held,
1047 * queue the skb for future freeing at end of __dev_xmit_skb()
1049 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1051 skb->next = *to_free;
1055 static inline void __qdisc_drop_all(struct sk_buff *skb,
1056 struct sk_buff **to_free)
1059 skb->prev->next = *to_free;
1061 skb->next = *to_free;
1065 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1066 struct qdisc_skb_head *qh,
1067 struct sk_buff **to_free)
1069 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1071 if (likely(skb != NULL)) {
1072 unsigned int len = qdisc_pkt_len(skb);
1074 qdisc_qstats_backlog_dec(sch, skb);
1075 __qdisc_drop(skb, to_free);
1082 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1084 const struct qdisc_skb_head *qh = &sch->q;
1089 /* generic pseudo peek method for non-work-conserving qdisc */
1090 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1092 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1094 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1096 skb = sch->dequeue(sch);
1099 __skb_queue_head(&sch->gso_skb, skb);
1100 /* it's still part of the queue */
1101 qdisc_qstats_backlog_inc(sch, skb);
1109 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1110 struct sk_buff *skb)
1112 if (qdisc_is_percpu_stats(sch)) {
1113 qdisc_qstats_cpu_backlog_dec(sch, skb);
1114 qdisc_bstats_cpu_update(sch, skb);
1115 qdisc_qstats_cpu_qlen_dec(sch);
1117 qdisc_qstats_backlog_dec(sch, skb);
1118 qdisc_bstats_update(sch, skb);
1123 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1124 unsigned int pkt_len)
1126 if (qdisc_is_percpu_stats(sch)) {
1127 qdisc_qstats_cpu_qlen_inc(sch);
1128 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1130 sch->qstats.backlog += pkt_len;
1135 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1136 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1138 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1141 skb = __skb_dequeue(&sch->gso_skb);
1142 if (qdisc_is_percpu_stats(sch)) {
1143 qdisc_qstats_cpu_backlog_dec(sch, skb);
1144 qdisc_qstats_cpu_qlen_dec(sch);
1146 qdisc_qstats_backlog_dec(sch, skb);
1150 skb = sch->dequeue(sch);
1156 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1159 * We do not know the backlog in bytes of this list, it
1160 * is up to the caller to correct it
1164 rtnl_kfree_skbs(qh->head, qh->tail);
1172 static inline void qdisc_reset_queue(struct Qdisc *sch)
1174 __qdisc_reset_queue(&sch->q);
1175 sch->qstats.backlog = 0;
1178 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1179 struct Qdisc **pold)
1187 qdisc_purge_queue(old);
1188 sch_tree_unlock(sch);
1193 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1195 rtnl_kfree_skbs(skb, skb);
1196 qdisc_qstats_drop(sch);
1199 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1200 struct sk_buff **to_free)
1202 __qdisc_drop(skb, to_free);
1203 qdisc_qstats_cpu_drop(sch);
1205 return NET_XMIT_DROP;
1208 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1209 struct sk_buff **to_free)
1211 __qdisc_drop(skb, to_free);
1212 qdisc_qstats_drop(sch);
1214 return NET_XMIT_DROP;
1217 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1218 struct sk_buff **to_free)
1220 __qdisc_drop_all(skb, to_free);
1221 qdisc_qstats_drop(sch);
1223 return NET_XMIT_DROP;
1226 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1227 long it will take to send a packet given its size.
1229 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1231 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1234 slot >>= rtab->rate.cell_log;
1236 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1237 return rtab->data[slot];
1240 struct psched_ratecfg {
1241 u64 rate_bytes_ps; /* bytes per second */
1248 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1253 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1254 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1256 return ((u64)len * r->mult) >> r->shift;
1259 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1260 const struct tc_ratespec *conf,
1263 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1264 const struct psched_ratecfg *r)
1266 memset(res, 0, sizeof(*res));
1268 /* legacy struct tc_ratespec has a 32bit @rate field
1269 * Qdisc using 64bit rate should add new attributes
1270 * in order to maintain compatibility.
1272 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1274 res->overhead = r->overhead;
1275 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1278 struct psched_pktrate {
1279 u64 rate_pkts_ps; /* packets per second */
1284 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r,
1285 unsigned int pkt_num)
1287 return ((u64)pkt_num * r->mult) >> r->shift;
1290 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64);
1292 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1293 * The fast path only needs to access filter list and to update stats
1296 struct tcf_proto *filter_list;
1297 struct tcf_block *block;
1298 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1299 struct gnet_stats_queue __percpu *cpu_qstats;
1300 struct rcu_head rcu;
1303 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1304 const struct sk_buff *skb)
1306 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1309 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1311 this_cpu_inc(miniq->cpu_qstats->drops);
1314 struct mini_Qdisc_pair {
1315 struct mini_Qdisc miniq1;
1316 struct mini_Qdisc miniq2;
1317 struct mini_Qdisc __rcu **p_miniq;
1320 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1321 struct tcf_proto *tp_head);
1322 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1323 struct mini_Qdisc __rcu **p_miniq);
1324 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1325 struct tcf_block *block);
1327 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));