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,
40 __QDISC_STATE_DRAINING,
43 #define QDISC_STATE_MISSED BIT(__QDISC_STATE_MISSED)
44 #define QDISC_STATE_DRAINING BIT(__QDISC_STATE_DRAINING)
46 #define QDISC_STATE_NON_EMPTY (QDISC_STATE_MISSED | \
49 struct qdisc_size_table {
51 struct list_head list;
52 struct tc_sizespec szopts;
57 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
58 struct qdisc_skb_head {
66 int (*enqueue)(struct sk_buff *skb,
68 struct sk_buff **to_free);
69 struct sk_buff * (*dequeue)(struct Qdisc *sch);
71 #define TCQ_F_BUILTIN 1
72 #define TCQ_F_INGRESS 2
73 #define TCQ_F_CAN_BYPASS 4
74 #define TCQ_F_MQROOT 8
75 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
76 * q->dev_queue : It can test
77 * netif_xmit_frozen_or_stopped() before
78 * dequeueing next packet.
79 * Its true for MQ/MQPRIO slaves, or non
82 #define TCQ_F_WARN_NONWC (1 << 16)
83 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
84 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
85 * qdisc_tree_decrease_qlen() should stop.
87 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
88 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
89 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
91 const struct Qdisc_ops *ops;
92 struct qdisc_size_table __rcu *stab;
93 struct hlist_node hash;
97 struct netdev_queue *dev_queue;
99 struct net_rate_estimator __rcu *rate_est;
100 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
101 struct gnet_stats_queue __percpu *cpu_qstats;
106 * For performance sake on SMP, we put highly modified fields at the end
108 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
109 struct qdisc_skb_head q;
110 struct gnet_stats_basic_packed bstats;
112 struct gnet_stats_queue qstats;
114 struct Qdisc *next_sched;
115 struct sk_buff_head skb_bad_txq;
117 spinlock_t busylock ____cacheline_aligned_in_smp;
123 long privdata[] ____cacheline_aligned;
126 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
128 if (qdisc->flags & TCQ_F_BUILTIN)
130 refcount_inc(&qdisc->refcnt);
133 /* Intended to be used by unlocked users, when concurrent qdisc release is
137 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
139 if (qdisc->flags & TCQ_F_BUILTIN)
141 if (refcount_inc_not_zero(&qdisc->refcnt))
146 static inline bool qdisc_is_running(struct Qdisc *qdisc)
148 if (qdisc->flags & TCQ_F_NOLOCK)
149 return spin_is_locked(&qdisc->seqlock);
150 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
153 static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc)
155 return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY);
158 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
160 return q->flags & TCQ_F_CPUSTATS;
163 static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
165 if (qdisc_is_percpu_stats(qdisc))
166 return nolock_qdisc_is_empty(qdisc);
167 return !READ_ONCE(qdisc->q.qlen);
170 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
172 if (qdisc->flags & TCQ_F_NOLOCK) {
173 if (spin_trylock(&qdisc->seqlock))
176 /* Paired with smp_mb__after_atomic() to make sure
177 * STATE_MISSED checking is synchronized with clearing
178 * in pfifo_fast_dequeue().
180 smp_mb__before_atomic();
182 /* If the MISSED flag is set, it means other thread has
183 * set the MISSED flag before second spin_trylock(), so
184 * we can return false here to avoid multi cpus doing
185 * the set_bit() and second spin_trylock() concurrently.
187 if (test_bit(__QDISC_STATE_MISSED, &qdisc->state))
190 /* Set the MISSED flag before the second spin_trylock(),
191 * if the second spin_trylock() return false, it means
192 * other cpu holding the lock will do dequeuing for us
193 * or it will see the MISSED flag set after releasing
194 * lock and reschedule the net_tx_action() to do the
197 set_bit(__QDISC_STATE_MISSED, &qdisc->state);
199 /* spin_trylock() only has load-acquire semantic, so use
200 * smp_mb__after_atomic() to ensure STATE_MISSED is set
201 * before doing the second spin_trylock().
203 smp_mb__after_atomic();
205 /* Retry again in case other CPU may not see the new flag
206 * after it releases the lock at the end of qdisc_run_end().
208 return spin_trylock(&qdisc->seqlock);
209 } else if (qdisc_is_running(qdisc)) {
212 /* Variant of write_seqcount_begin() telling lockdep a trylock
215 raw_write_seqcount_begin(&qdisc->running);
216 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
220 static inline void qdisc_run_end(struct Qdisc *qdisc)
222 if (qdisc->flags & TCQ_F_NOLOCK) {
223 spin_unlock(&qdisc->seqlock);
225 if (unlikely(test_bit(__QDISC_STATE_MISSED,
227 __netif_schedule(qdisc);
229 write_seqcount_end(&qdisc->running);
233 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
235 return qdisc->flags & TCQ_F_ONETXQUEUE;
238 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
241 /* Non-BQL migrated drivers will return 0, too. */
242 return dql_avail(&txq->dql);
248 struct Qdisc_class_ops {
250 /* Child qdisc manipulation */
251 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
252 int (*graft)(struct Qdisc *, unsigned long cl,
253 struct Qdisc *, struct Qdisc **,
254 struct netlink_ext_ack *extack);
255 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
256 void (*qlen_notify)(struct Qdisc *, unsigned long);
258 /* Class manipulation routines */
259 unsigned long (*find)(struct Qdisc *, u32 classid);
260 int (*change)(struct Qdisc *, u32, u32,
261 struct nlattr **, unsigned long *,
262 struct netlink_ext_ack *);
263 int (*delete)(struct Qdisc *, unsigned long,
264 struct netlink_ext_ack *);
265 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
267 /* Filter manipulation */
268 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
270 struct netlink_ext_ack *extack);
271 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
273 void (*unbind_tcf)(struct Qdisc *, unsigned long);
275 /* rtnetlink specific */
276 int (*dump)(struct Qdisc *, unsigned long,
277 struct sk_buff *skb, struct tcmsg*);
278 int (*dump_stats)(struct Qdisc *, unsigned long,
282 /* Qdisc_class_ops flag values */
284 /* Implements API that doesn't require rtnl lock */
285 enum qdisc_class_ops_flags {
286 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
290 struct Qdisc_ops *next;
291 const struct Qdisc_class_ops *cl_ops;
294 unsigned int static_flags;
296 int (*enqueue)(struct sk_buff *skb,
298 struct sk_buff **to_free);
299 struct sk_buff * (*dequeue)(struct Qdisc *);
300 struct sk_buff * (*peek)(struct Qdisc *);
302 int (*init)(struct Qdisc *sch, struct nlattr *arg,
303 struct netlink_ext_ack *extack);
304 void (*reset)(struct Qdisc *);
305 void (*destroy)(struct Qdisc *);
306 int (*change)(struct Qdisc *sch,
308 struct netlink_ext_ack *extack);
309 void (*attach)(struct Qdisc *sch);
310 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
311 void (*change_real_num_tx)(struct Qdisc *sch,
312 unsigned int new_real_tx);
314 int (*dump)(struct Qdisc *, struct sk_buff *);
315 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
317 void (*ingress_block_set)(struct Qdisc *sch,
319 void (*egress_block_set)(struct Qdisc *sch,
321 u32 (*ingress_block_get)(struct Qdisc *sch);
322 u32 (*egress_block_get)(struct Qdisc *sch);
324 struct module *owner;
334 const struct tcf_proto *goto_tp;
336 /* used in the skb_tc_reinsert function */
339 struct gnet_stats_queue *qstats;
346 struct tcf_proto_ops {
347 struct list_head head;
350 int (*classify)(struct sk_buff *,
351 const struct tcf_proto *,
352 struct tcf_result *);
353 int (*init)(struct tcf_proto*);
354 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
355 struct netlink_ext_ack *extack);
357 void* (*get)(struct tcf_proto*, u32 handle);
358 void (*put)(struct tcf_proto *tp, void *f);
359 int (*change)(struct net *net, struct sk_buff *,
360 struct tcf_proto*, unsigned long,
361 u32 handle, struct nlattr **,
363 struct netlink_ext_ack *);
364 int (*delete)(struct tcf_proto *tp, void *arg,
365 bool *last, bool rtnl_held,
366 struct netlink_ext_ack *);
367 bool (*delete_empty)(struct tcf_proto *tp);
368 void (*walk)(struct tcf_proto *tp,
369 struct tcf_walker *arg, bool rtnl_held);
370 int (*reoffload)(struct tcf_proto *tp, bool add,
371 flow_setup_cb_t *cb, void *cb_priv,
372 struct netlink_ext_ack *extack);
373 void (*hw_add)(struct tcf_proto *tp,
375 void (*hw_del)(struct tcf_proto *tp,
377 void (*bind_class)(void *, u32, unsigned long,
378 void *, unsigned long);
379 void * (*tmplt_create)(struct net *net,
380 struct tcf_chain *chain,
382 struct netlink_ext_ack *extack);
383 void (*tmplt_destroy)(void *tmplt_priv);
385 /* rtnetlink specific */
386 int (*dump)(struct net*, struct tcf_proto*, void *,
387 struct sk_buff *skb, struct tcmsg*,
389 int (*terse_dump)(struct net *net,
390 struct tcf_proto *tp, void *fh,
392 struct tcmsg *t, bool rtnl_held);
393 int (*tmplt_dump)(struct sk_buff *skb,
397 struct module *owner;
401 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
402 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
403 * conditions can occur when filters are inserted/deleted simultaneously.
405 enum tcf_proto_ops_flags {
406 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
410 /* Fast access part */
411 struct tcf_proto __rcu *next;
414 /* called under RCU BH lock*/
415 int (*classify)(struct sk_buff *,
416 const struct tcf_proto *,
417 struct tcf_result *);
423 const struct tcf_proto_ops *ops;
424 struct tcf_chain *chain;
425 /* Lock protects tcf_proto shared state and can be used by unlocked
426 * classifiers to protect their private data.
432 struct hlist_node destroy_ht_node;
435 struct qdisc_skb_cb {
437 unsigned int pkt_len;
438 u16 slave_dev_queue_mapping;
441 #define QDISC_CB_PRIV_LEN 20
442 unsigned char data[QDISC_CB_PRIV_LEN];
445 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
448 /* Protects filter_chain. */
449 struct mutex filter_chain_lock;
450 struct tcf_proto __rcu *filter_chain;
451 struct list_head list;
452 struct tcf_block *block;
453 u32 index; /* chain index */
455 unsigned int action_refcnt;
456 bool explicitly_created;
458 const struct tcf_proto_ops *tmplt_ops;
464 /* Lock protects tcf_block and lifetime-management data of chains
465 * attached to the block (refcnt, action_refcnt, explicitly_created).
468 struct list_head chain_list;
469 u32 index; /* block index for shared blocks */
470 u32 classid; /* which class this block belongs to */
474 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
475 struct flow_block flow_block;
476 struct list_head owner_list;
478 atomic_t offloadcnt; /* Number of oddloaded filters */
479 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
480 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
482 struct tcf_chain *chain;
483 struct list_head filter_chain_list;
486 DECLARE_HASHTABLE(proto_destroy_ht, 7);
487 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
490 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
492 return lockdep_is_held(&chain->filter_chain_lock);
495 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
497 return lockdep_is_held(&tp->lock);
500 #define tcf_chain_dereference(p, chain) \
501 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
503 #define tcf_proto_dereference(p, tp) \
504 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
506 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
508 struct qdisc_skb_cb *qcb;
510 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb));
511 BUILD_BUG_ON(sizeof(qcb->data) < sz);
514 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
516 return this_cpu_ptr(q->cpu_qstats)->qlen;
519 static inline int qdisc_qlen(const struct Qdisc *q)
524 static inline int qdisc_qlen_sum(const struct Qdisc *q)
526 __u32 qlen = q->qstats.qlen;
529 if (qdisc_is_percpu_stats(q)) {
530 for_each_possible_cpu(i)
531 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
539 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
541 return (struct qdisc_skb_cb *)skb->cb;
544 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
546 return &qdisc->q.lock;
549 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
551 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
556 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
558 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
561 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
563 return qdisc->dev_queue->qdisc_sleeping;
566 /* The qdisc root lock is a mechanism by which to top level
567 * of a qdisc tree can be locked from any qdisc node in the
568 * forest. This allows changing the configuration of some
569 * aspect of the qdisc tree while blocking out asynchronous
570 * qdisc access in the packet processing paths.
572 * It is only legal to do this when the root will not change
573 * on us. Otherwise we'll potentially lock the wrong qdisc
574 * root. This is enforced by holding the RTNL semaphore, which
575 * all users of this lock accessor must do.
577 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
579 struct Qdisc *root = qdisc_root(qdisc);
582 return qdisc_lock(root);
585 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
587 struct Qdisc *root = qdisc_root_sleeping(qdisc);
590 return qdisc_lock(root);
593 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
595 struct Qdisc *root = qdisc_root_sleeping(qdisc);
598 return &root->running;
601 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
603 return qdisc->dev_queue->dev;
606 static inline void sch_tree_lock(struct Qdisc *q)
608 if (q->flags & TCQ_F_MQROOT)
609 spin_lock_bh(qdisc_lock(q));
611 spin_lock_bh(qdisc_root_sleeping_lock(q));
614 static inline void sch_tree_unlock(struct Qdisc *q)
616 if (q->flags & TCQ_F_MQROOT)
617 spin_unlock_bh(qdisc_lock(q));
619 spin_unlock_bh(qdisc_root_sleeping_lock(q));
622 extern struct Qdisc noop_qdisc;
623 extern struct Qdisc_ops noop_qdisc_ops;
624 extern struct Qdisc_ops pfifo_fast_ops;
625 extern struct Qdisc_ops mq_qdisc_ops;
626 extern struct Qdisc_ops noqueue_qdisc_ops;
627 extern const struct Qdisc_ops *default_qdisc_ops;
628 static inline const struct Qdisc_ops *
629 get_default_qdisc_ops(const struct net_device *dev, int ntx)
631 return ntx < dev->real_num_tx_queues ?
632 default_qdisc_ops : &pfifo_fast_ops;
635 struct Qdisc_class_common {
637 struct hlist_node hnode;
640 struct Qdisc_class_hash {
641 struct hlist_head *hash;
642 unsigned int hashsize;
643 unsigned int hashmask;
644 unsigned int hashelems;
647 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
654 static inline struct Qdisc_class_common *
655 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
657 struct Qdisc_class_common *cl;
663 h = qdisc_class_hash(id, hash->hashmask);
664 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
665 if (cl->classid == id)
671 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
673 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
675 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
678 int qdisc_class_hash_init(struct Qdisc_class_hash *);
679 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
680 struct Qdisc_class_common *);
681 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
682 struct Qdisc_class_common *);
683 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
684 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
686 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
687 void dev_qdisc_change_real_num_tx(struct net_device *dev,
688 unsigned int new_real_tx);
689 void dev_init_scheduler(struct net_device *dev);
690 void dev_shutdown(struct net_device *dev);
691 void dev_activate(struct net_device *dev);
692 void dev_deactivate(struct net_device *dev);
693 void dev_deactivate_many(struct list_head *head);
694 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
695 struct Qdisc *qdisc);
696 void qdisc_reset(struct Qdisc *qdisc);
697 void qdisc_put(struct Qdisc *qdisc);
698 void qdisc_put_unlocked(struct Qdisc *qdisc);
699 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
700 #ifdef CONFIG_NET_SCHED
701 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
703 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
704 struct Qdisc *new, struct Qdisc *old,
705 enum tc_setup_type type, void *type_data,
706 struct netlink_ext_ack *extack);
709 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
712 q->flags &= ~TCQ_F_OFFLOADED;
717 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
718 struct Qdisc *new, struct Qdisc *old,
719 enum tc_setup_type type, void *type_data,
720 struct netlink_ext_ack *extack)
724 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
725 const struct Qdisc_ops *ops,
726 struct netlink_ext_ack *extack);
727 void qdisc_free(struct Qdisc *qdisc);
728 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
729 const struct Qdisc_ops *ops, u32 parentid,
730 struct netlink_ext_ack *extack);
731 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
732 const struct qdisc_size_table *stab);
733 int skb_do_redirect(struct sk_buff *);
735 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
737 #ifdef CONFIG_NET_CLS_ACT
738 return skb->tc_at_ingress;
744 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
746 #ifdef CONFIG_NET_CLS_ACT
747 if (skb->tc_skip_classify) {
748 skb->tc_skip_classify = 0;
755 /* Reset all TX qdiscs greater than index of a device. */
756 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
760 for (; i < dev->num_tx_queues; i++) {
761 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
763 spin_lock_bh(qdisc_lock(qdisc));
765 spin_unlock_bh(qdisc_lock(qdisc));
770 /* Are all TX queues of the device empty? */
771 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
776 for (i = 0; i < dev->num_tx_queues; i++) {
777 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
778 const struct Qdisc *q = rcu_dereference(txq->qdisc);
780 if (!qdisc_is_empty(q)) {
789 /* Are any of the TX qdiscs changing? */
790 static inline bool qdisc_tx_changing(const struct net_device *dev)
794 for (i = 0; i < dev->num_tx_queues; i++) {
795 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
796 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
802 /* Is the device using the noop qdisc on all queues? */
803 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
807 for (i = 0; i < dev->num_tx_queues; i++) {
808 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
809 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
815 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
817 return qdisc_skb_cb(skb)->pkt_len;
820 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
821 enum net_xmit_qdisc_t {
822 __NET_XMIT_STOLEN = 0x00010000,
823 __NET_XMIT_BYPASS = 0x00020000,
826 #ifdef CONFIG_NET_CLS_ACT
827 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
829 #define net_xmit_drop_count(e) (1)
832 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
833 const struct Qdisc *sch)
835 #ifdef CONFIG_NET_SCHED
836 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
839 __qdisc_calculate_pkt_len(skb, stab);
843 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
844 struct sk_buff **to_free)
846 qdisc_calculate_pkt_len(skb, sch);
847 return sch->enqueue(skb, sch, to_free);
850 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
851 __u64 bytes, __u32 packets)
853 bstats->bytes += bytes;
854 bstats->packets += packets;
857 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
858 const struct sk_buff *skb)
860 _bstats_update(bstats,
862 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
865 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
866 __u64 bytes, __u32 packets)
868 u64_stats_update_begin(&bstats->syncp);
869 _bstats_update(&bstats->bstats, bytes, packets);
870 u64_stats_update_end(&bstats->syncp);
873 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
874 const struct sk_buff *skb)
876 u64_stats_update_begin(&bstats->syncp);
877 bstats_update(&bstats->bstats, skb);
878 u64_stats_update_end(&bstats->syncp);
881 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
882 const struct sk_buff *skb)
884 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
887 static inline void qdisc_bstats_update(struct Qdisc *sch,
888 const struct sk_buff *skb)
890 bstats_update(&sch->bstats, skb);
893 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
894 const struct sk_buff *skb)
896 sch->qstats.backlog -= qdisc_pkt_len(skb);
899 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
900 const struct sk_buff *skb)
902 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
905 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
906 const struct sk_buff *skb)
908 sch->qstats.backlog += qdisc_pkt_len(skb);
911 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
912 const struct sk_buff *skb)
914 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
917 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
919 this_cpu_inc(sch->cpu_qstats->qlen);
922 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
924 this_cpu_dec(sch->cpu_qstats->qlen);
927 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
929 this_cpu_inc(sch->cpu_qstats->requeues);
932 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
934 sch->qstats.drops += count;
937 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
942 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
944 qstats->overlimits++;
947 static inline void qdisc_qstats_drop(struct Qdisc *sch)
949 qstats_drop_inc(&sch->qstats);
952 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
954 this_cpu_inc(sch->cpu_qstats->drops);
957 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
959 sch->qstats.overlimits++;
962 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
964 __u32 qlen = qdisc_qlen_sum(sch);
966 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
969 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
972 struct gnet_stats_queue qstats = { 0 };
973 __u32 len = qdisc_qlen_sum(sch);
975 __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
977 *backlog = qstats.backlog;
980 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
984 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
985 qdisc_tree_reduce_backlog(sch, qlen, backlog);
988 static inline void qdisc_purge_queue(struct Qdisc *sch)
992 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
994 qdisc_tree_reduce_backlog(sch, qlen, backlog);
997 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
1004 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
1005 struct qdisc_skb_head *qh)
1007 struct sk_buff *last = qh->tail;
1020 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
1022 __qdisc_enqueue_tail(skb, &sch->q);
1023 qdisc_qstats_backlog_inc(sch, skb);
1024 return NET_XMIT_SUCCESS;
1027 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
1028 struct qdisc_skb_head *qh)
1030 skb->next = qh->head;
1038 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
1040 struct sk_buff *skb = qh->head;
1042 if (likely(skb != NULL)) {
1043 qh->head = skb->next;
1045 if (qh->head == NULL)
1053 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1055 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1057 if (likely(skb != NULL)) {
1058 qdisc_qstats_backlog_dec(sch, skb);
1059 qdisc_bstats_update(sch, skb);
1065 /* Instead of calling kfree_skb() while root qdisc lock is held,
1066 * queue the skb for future freeing at end of __dev_xmit_skb()
1068 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1070 skb->next = *to_free;
1074 static inline void __qdisc_drop_all(struct sk_buff *skb,
1075 struct sk_buff **to_free)
1078 skb->prev->next = *to_free;
1080 skb->next = *to_free;
1084 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1085 struct qdisc_skb_head *qh,
1086 struct sk_buff **to_free)
1088 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1090 if (likely(skb != NULL)) {
1091 unsigned int len = qdisc_pkt_len(skb);
1093 qdisc_qstats_backlog_dec(sch, skb);
1094 __qdisc_drop(skb, to_free);
1101 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1103 const struct qdisc_skb_head *qh = &sch->q;
1108 /* generic pseudo peek method for non-work-conserving qdisc */
1109 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1111 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1113 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1115 skb = sch->dequeue(sch);
1118 __skb_queue_head(&sch->gso_skb, skb);
1119 /* it's still part of the queue */
1120 qdisc_qstats_backlog_inc(sch, skb);
1128 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1129 struct sk_buff *skb)
1131 if (qdisc_is_percpu_stats(sch)) {
1132 qdisc_qstats_cpu_backlog_dec(sch, skb);
1133 qdisc_bstats_cpu_update(sch, skb);
1134 qdisc_qstats_cpu_qlen_dec(sch);
1136 qdisc_qstats_backlog_dec(sch, skb);
1137 qdisc_bstats_update(sch, skb);
1142 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1143 unsigned int pkt_len)
1145 if (qdisc_is_percpu_stats(sch)) {
1146 qdisc_qstats_cpu_qlen_inc(sch);
1147 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1149 sch->qstats.backlog += pkt_len;
1154 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1155 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1157 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1160 skb = __skb_dequeue(&sch->gso_skb);
1161 if (qdisc_is_percpu_stats(sch)) {
1162 qdisc_qstats_cpu_backlog_dec(sch, skb);
1163 qdisc_qstats_cpu_qlen_dec(sch);
1165 qdisc_qstats_backlog_dec(sch, skb);
1169 skb = sch->dequeue(sch);
1175 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1178 * We do not know the backlog in bytes of this list, it
1179 * is up to the caller to correct it
1183 rtnl_kfree_skbs(qh->head, qh->tail);
1191 static inline void qdisc_reset_queue(struct Qdisc *sch)
1193 __qdisc_reset_queue(&sch->q);
1194 sch->qstats.backlog = 0;
1197 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1198 struct Qdisc **pold)
1206 qdisc_purge_queue(old);
1207 sch_tree_unlock(sch);
1212 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1214 rtnl_kfree_skbs(skb, skb);
1215 qdisc_qstats_drop(sch);
1218 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1219 struct sk_buff **to_free)
1221 __qdisc_drop(skb, to_free);
1222 qdisc_qstats_cpu_drop(sch);
1224 return NET_XMIT_DROP;
1227 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1228 struct sk_buff **to_free)
1230 __qdisc_drop(skb, to_free);
1231 qdisc_qstats_drop(sch);
1233 return NET_XMIT_DROP;
1236 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1237 struct sk_buff **to_free)
1239 __qdisc_drop_all(skb, to_free);
1240 qdisc_qstats_drop(sch);
1242 return NET_XMIT_DROP;
1245 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1246 long it will take to send a packet given its size.
1248 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1250 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1253 slot >>= rtab->rate.cell_log;
1255 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1256 return rtab->data[slot];
1259 struct psched_ratecfg {
1260 u64 rate_bytes_ps; /* bytes per second */
1268 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1276 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1277 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1279 return ((u64)len * r->mult) >> r->shift;
1282 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1283 const struct tc_ratespec *conf,
1286 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1287 const struct psched_ratecfg *r)
1289 memset(res, 0, sizeof(*res));
1291 /* legacy struct tc_ratespec has a 32bit @rate field
1292 * Qdisc using 64bit rate should add new attributes
1293 * in order to maintain compatibility.
1295 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1297 res->overhead = r->overhead;
1299 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1302 struct psched_pktrate {
1303 u64 rate_pkts_ps; /* packets per second */
1308 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r,
1309 unsigned int pkt_num)
1311 return ((u64)pkt_num * r->mult) >> r->shift;
1314 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64);
1316 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1317 * The fast path only needs to access filter list and to update stats
1320 struct tcf_proto *filter_list;
1321 struct tcf_block *block;
1322 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1323 struct gnet_stats_queue __percpu *cpu_qstats;
1324 struct rcu_head rcu;
1327 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1328 const struct sk_buff *skb)
1330 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1333 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1335 this_cpu_inc(miniq->cpu_qstats->drops);
1338 struct mini_Qdisc_pair {
1339 struct mini_Qdisc miniq1;
1340 struct mini_Qdisc miniq2;
1341 struct mini_Qdisc __rcu **p_miniq;
1344 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1345 struct tcf_proto *tp_head);
1346 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1347 struct mini_Qdisc __rcu **p_miniq);
1348 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1349 struct tcf_block *block);
1351 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));