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,
44 /* Only for !TCQ_F_NOLOCK qdisc. Never access it directly.
45 * Use qdisc_run_begin/end() or qdisc_is_running() instead.
47 __QDISC_STATE2_RUNNING,
50 #define QDISC_STATE_MISSED BIT(__QDISC_STATE_MISSED)
51 #define QDISC_STATE_DRAINING BIT(__QDISC_STATE_DRAINING)
53 #define QDISC_STATE_NON_EMPTY (QDISC_STATE_MISSED | \
56 struct qdisc_size_table {
58 struct list_head list;
59 struct tc_sizespec szopts;
64 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
65 struct qdisc_skb_head {
73 int (*enqueue)(struct sk_buff *skb,
75 struct sk_buff **to_free);
76 struct sk_buff * (*dequeue)(struct Qdisc *sch);
78 #define TCQ_F_BUILTIN 1
79 #define TCQ_F_INGRESS 2
80 #define TCQ_F_CAN_BYPASS 4
81 #define TCQ_F_MQROOT 8
82 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
83 * q->dev_queue : It can test
84 * netif_xmit_frozen_or_stopped() before
85 * dequeueing next packet.
86 * Its true for MQ/MQPRIO slaves, or non
89 #define TCQ_F_WARN_NONWC (1 << 16)
90 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
91 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
92 * qdisc_tree_decrease_qlen() should stop.
94 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
95 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
96 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
98 const struct Qdisc_ops *ops;
99 struct qdisc_size_table __rcu *stab;
100 struct hlist_node hash;
104 struct netdev_queue *dev_queue;
106 struct net_rate_estimator __rcu *rate_est;
107 struct gnet_stats_basic_sync __percpu *cpu_bstats;
108 struct gnet_stats_queue __percpu *cpu_qstats;
113 * For performance sake on SMP, we put highly modified fields at the end
115 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
116 struct qdisc_skb_head q;
117 struct gnet_stats_basic_sync bstats;
118 struct gnet_stats_queue qstats;
120 unsigned long state2; /* must be written under qdisc spinlock */
121 struct Qdisc *next_sched;
122 struct sk_buff_head skb_bad_txq;
124 spinlock_t busylock ____cacheline_aligned_in_smp;
128 netdevice_tracker dev_tracker;
130 long privdata[] ____cacheline_aligned;
133 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
135 if (qdisc->flags & TCQ_F_BUILTIN)
137 refcount_inc(&qdisc->refcnt);
140 /* Intended to be used by unlocked users, when concurrent qdisc release is
144 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
146 if (qdisc->flags & TCQ_F_BUILTIN)
148 if (refcount_inc_not_zero(&qdisc->refcnt))
153 /* For !TCQ_F_NOLOCK qdisc: callers must either call this within a qdisc
154 * root_lock section, or provide their own memory barriers -- ordering
155 * against qdisc_run_begin/end() atomic bit operations.
157 static inline bool qdisc_is_running(struct Qdisc *qdisc)
159 if (qdisc->flags & TCQ_F_NOLOCK)
160 return spin_is_locked(&qdisc->seqlock);
161 return test_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
164 static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc)
166 return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY);
169 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
171 return q->flags & TCQ_F_CPUSTATS;
174 static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
176 if (qdisc_is_percpu_stats(qdisc))
177 return nolock_qdisc_is_empty(qdisc);
178 return !READ_ONCE(qdisc->q.qlen);
181 /* For !TCQ_F_NOLOCK qdisc, qdisc_run_begin/end() must be invoked with
182 * the qdisc root lock acquired.
184 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
186 if (qdisc->flags & TCQ_F_NOLOCK) {
187 if (spin_trylock(&qdisc->seqlock))
190 /* No need to insist if the MISSED flag was already set.
191 * Note that test_and_set_bit() also gives us memory ordering
192 * guarantees wrt potential earlier enqueue() and below
193 * spin_trylock(), both of which are necessary to prevent races
195 if (test_and_set_bit(__QDISC_STATE_MISSED, &qdisc->state))
198 /* Try to take the lock again to make sure that we will either
199 * grab it or the CPU that still has it will see MISSED set
200 * when testing it in qdisc_run_end()
202 return spin_trylock(&qdisc->seqlock);
204 return !__test_and_set_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
207 static inline void qdisc_run_end(struct Qdisc *qdisc)
209 if (qdisc->flags & TCQ_F_NOLOCK) {
210 spin_unlock(&qdisc->seqlock);
212 /* spin_unlock() only has store-release semantic. The unlock
213 * and test_bit() ordering is a store-load ordering, so a full
214 * memory barrier is needed here.
218 if (unlikely(test_bit(__QDISC_STATE_MISSED,
220 __netif_schedule(qdisc);
222 __clear_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
226 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
228 return qdisc->flags & TCQ_F_ONETXQUEUE;
231 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
234 /* Non-BQL migrated drivers will return 0, too. */
235 return dql_avail(&txq->dql);
241 struct Qdisc_class_ops {
243 /* Child qdisc manipulation */
244 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
245 int (*graft)(struct Qdisc *, unsigned long cl,
246 struct Qdisc *, struct Qdisc **,
247 struct netlink_ext_ack *extack);
248 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
249 void (*qlen_notify)(struct Qdisc *, unsigned long);
251 /* Class manipulation routines */
252 unsigned long (*find)(struct Qdisc *, u32 classid);
253 int (*change)(struct Qdisc *, u32, u32,
254 struct nlattr **, unsigned long *,
255 struct netlink_ext_ack *);
256 int (*delete)(struct Qdisc *, unsigned long,
257 struct netlink_ext_ack *);
258 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
260 /* Filter manipulation */
261 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
263 struct netlink_ext_ack *extack);
264 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
266 void (*unbind_tcf)(struct Qdisc *, unsigned long);
268 /* rtnetlink specific */
269 int (*dump)(struct Qdisc *, unsigned long,
270 struct sk_buff *skb, struct tcmsg*);
271 int (*dump_stats)(struct Qdisc *, unsigned long,
275 /* Qdisc_class_ops flag values */
277 /* Implements API that doesn't require rtnl lock */
278 enum qdisc_class_ops_flags {
279 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
283 struct Qdisc_ops *next;
284 const struct Qdisc_class_ops *cl_ops;
287 unsigned int static_flags;
289 int (*enqueue)(struct sk_buff *skb,
291 struct sk_buff **to_free);
292 struct sk_buff * (*dequeue)(struct Qdisc *);
293 struct sk_buff * (*peek)(struct Qdisc *);
295 int (*init)(struct Qdisc *sch, struct nlattr *arg,
296 struct netlink_ext_ack *extack);
297 void (*reset)(struct Qdisc *);
298 void (*destroy)(struct Qdisc *);
299 int (*change)(struct Qdisc *sch,
301 struct netlink_ext_ack *extack);
302 void (*attach)(struct Qdisc *sch);
303 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
304 void (*change_real_num_tx)(struct Qdisc *sch,
305 unsigned int new_real_tx);
307 int (*dump)(struct Qdisc *, struct sk_buff *);
308 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
310 void (*ingress_block_set)(struct Qdisc *sch,
312 void (*egress_block_set)(struct Qdisc *sch,
314 u32 (*ingress_block_get)(struct Qdisc *sch);
315 u32 (*egress_block_get)(struct Qdisc *sch);
317 struct module *owner;
327 const struct tcf_proto *goto_tp;
334 struct tcf_proto_ops {
335 struct list_head head;
338 int (*classify)(struct sk_buff *,
339 const struct tcf_proto *,
340 struct tcf_result *);
341 int (*init)(struct tcf_proto*);
342 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
343 struct netlink_ext_ack *extack);
345 void* (*get)(struct tcf_proto*, u32 handle);
346 void (*put)(struct tcf_proto *tp, void *f);
347 int (*change)(struct net *net, struct sk_buff *,
348 struct tcf_proto*, unsigned long,
349 u32 handle, struct nlattr **,
351 struct netlink_ext_ack *);
352 int (*delete)(struct tcf_proto *tp, void *arg,
353 bool *last, bool rtnl_held,
354 struct netlink_ext_ack *);
355 bool (*delete_empty)(struct tcf_proto *tp);
356 void (*walk)(struct tcf_proto *tp,
357 struct tcf_walker *arg, bool rtnl_held);
358 int (*reoffload)(struct tcf_proto *tp, bool add,
359 flow_setup_cb_t *cb, void *cb_priv,
360 struct netlink_ext_ack *extack);
361 void (*hw_add)(struct tcf_proto *tp,
363 void (*hw_del)(struct tcf_proto *tp,
365 void (*bind_class)(void *, u32, unsigned long,
366 void *, unsigned long);
367 void * (*tmplt_create)(struct net *net,
368 struct tcf_chain *chain,
370 struct netlink_ext_ack *extack);
371 void (*tmplt_destroy)(void *tmplt_priv);
373 /* rtnetlink specific */
374 int (*dump)(struct net*, struct tcf_proto*, void *,
375 struct sk_buff *skb, struct tcmsg*,
377 int (*terse_dump)(struct net *net,
378 struct tcf_proto *tp, void *fh,
380 struct tcmsg *t, bool rtnl_held);
381 int (*tmplt_dump)(struct sk_buff *skb,
385 struct module *owner;
389 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
390 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
391 * conditions can occur when filters are inserted/deleted simultaneously.
393 enum tcf_proto_ops_flags {
394 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
398 /* Fast access part */
399 struct tcf_proto __rcu *next;
402 /* called under RCU BH lock*/
403 int (*classify)(struct sk_buff *,
404 const struct tcf_proto *,
405 struct tcf_result *);
411 const struct tcf_proto_ops *ops;
412 struct tcf_chain *chain;
413 /* Lock protects tcf_proto shared state and can be used by unlocked
414 * classifiers to protect their private data.
420 struct hlist_node destroy_ht_node;
423 struct qdisc_skb_cb {
425 unsigned int pkt_len;
426 u16 slave_dev_queue_mapping;
429 #define QDISC_CB_PRIV_LEN 20
430 unsigned char data[QDISC_CB_PRIV_LEN];
433 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
436 /* Protects filter_chain. */
437 struct mutex filter_chain_lock;
438 struct tcf_proto __rcu *filter_chain;
439 struct list_head list;
440 struct tcf_block *block;
441 u32 index; /* chain index */
443 unsigned int action_refcnt;
444 bool explicitly_created;
446 const struct tcf_proto_ops *tmplt_ops;
452 /* Lock protects tcf_block and lifetime-management data of chains
453 * attached to the block (refcnt, action_refcnt, explicitly_created).
456 struct list_head chain_list;
457 u32 index; /* block index for shared blocks */
458 u32 classid; /* which class this block belongs to */
462 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
463 struct flow_block flow_block;
464 struct list_head owner_list;
466 atomic_t offloadcnt; /* Number of oddloaded filters */
467 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
468 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
470 struct tcf_chain *chain;
471 struct list_head filter_chain_list;
474 DECLARE_HASHTABLE(proto_destroy_ht, 7);
475 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
478 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
480 return lockdep_is_held(&chain->filter_chain_lock);
483 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
485 return lockdep_is_held(&tp->lock);
488 #define tcf_chain_dereference(p, chain) \
489 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
491 #define tcf_proto_dereference(p, tp) \
492 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
494 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
496 struct qdisc_skb_cb *qcb;
498 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb));
499 BUILD_BUG_ON(sizeof(qcb->data) < sz);
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 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
551 struct Qdisc *root = qdisc_root_sleeping(qdisc);
554 return qdisc_lock(root);
557 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
559 return qdisc->dev_queue->dev;
562 static inline void sch_tree_lock(struct Qdisc *q)
564 if (q->flags & TCQ_F_MQROOT)
565 spin_lock_bh(qdisc_lock(q));
567 spin_lock_bh(qdisc_root_sleeping_lock(q));
570 static inline void sch_tree_unlock(struct Qdisc *q)
572 if (q->flags & TCQ_F_MQROOT)
573 spin_unlock_bh(qdisc_lock(q));
575 spin_unlock_bh(qdisc_root_sleeping_lock(q));
578 extern struct Qdisc noop_qdisc;
579 extern struct Qdisc_ops noop_qdisc_ops;
580 extern struct Qdisc_ops pfifo_fast_ops;
581 extern struct Qdisc_ops mq_qdisc_ops;
582 extern struct Qdisc_ops noqueue_qdisc_ops;
583 extern const struct Qdisc_ops *default_qdisc_ops;
584 static inline const struct Qdisc_ops *
585 get_default_qdisc_ops(const struct net_device *dev, int ntx)
587 return ntx < dev->real_num_tx_queues ?
588 default_qdisc_ops : &pfifo_fast_ops;
591 struct Qdisc_class_common {
593 struct hlist_node hnode;
596 struct Qdisc_class_hash {
597 struct hlist_head *hash;
598 unsigned int hashsize;
599 unsigned int hashmask;
600 unsigned int hashelems;
603 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
610 static inline struct Qdisc_class_common *
611 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
613 struct Qdisc_class_common *cl;
619 h = qdisc_class_hash(id, hash->hashmask);
620 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
621 if (cl->classid == id)
627 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
629 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
631 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
634 int qdisc_class_hash_init(struct Qdisc_class_hash *);
635 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
636 struct Qdisc_class_common *);
637 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
638 struct Qdisc_class_common *);
639 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
640 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
642 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
643 void dev_qdisc_change_real_num_tx(struct net_device *dev,
644 unsigned int new_real_tx);
645 void dev_init_scheduler(struct net_device *dev);
646 void dev_shutdown(struct net_device *dev);
647 void dev_activate(struct net_device *dev);
648 void dev_deactivate(struct net_device *dev);
649 void dev_deactivate_many(struct list_head *head);
650 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
651 struct Qdisc *qdisc);
652 void qdisc_reset(struct Qdisc *qdisc);
653 void qdisc_put(struct Qdisc *qdisc);
654 void qdisc_put_unlocked(struct Qdisc *qdisc);
655 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
656 #ifdef CONFIG_NET_SCHED
657 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
659 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
660 struct Qdisc *new, struct Qdisc *old,
661 enum tc_setup_type type, void *type_data,
662 struct netlink_ext_ack *extack);
665 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
668 q->flags &= ~TCQ_F_OFFLOADED;
673 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
674 struct Qdisc *new, struct Qdisc *old,
675 enum tc_setup_type type, void *type_data,
676 struct netlink_ext_ack *extack)
680 void qdisc_offload_query_caps(struct net_device *dev,
681 enum tc_setup_type type,
682 void *caps, size_t caps_len);
683 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
684 const struct Qdisc_ops *ops,
685 struct netlink_ext_ack *extack);
686 void qdisc_free(struct Qdisc *qdisc);
687 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
688 const struct Qdisc_ops *ops, u32 parentid,
689 struct netlink_ext_ack *extack);
690 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
691 const struct qdisc_size_table *stab);
692 int skb_do_redirect(struct sk_buff *);
694 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
696 #ifdef CONFIG_NET_CLS_ACT
697 return skb->tc_at_ingress;
703 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
705 #ifdef CONFIG_NET_CLS_ACT
706 if (skb->tc_skip_classify) {
707 skb->tc_skip_classify = 0;
714 /* Reset all TX qdiscs greater than index of a device. */
715 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
719 for (; i < dev->num_tx_queues; i++) {
720 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
722 spin_lock_bh(qdisc_lock(qdisc));
724 spin_unlock_bh(qdisc_lock(qdisc));
729 /* Are all TX queues of the device empty? */
730 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
735 for (i = 0; i < dev->num_tx_queues; i++) {
736 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
737 const struct Qdisc *q = rcu_dereference(txq->qdisc);
739 if (!qdisc_is_empty(q)) {
748 /* Are any of the TX qdiscs changing? */
749 static inline bool qdisc_tx_changing(const struct net_device *dev)
753 for (i = 0; i < dev->num_tx_queues; i++) {
754 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
755 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
761 /* Is the device using the noop qdisc on all queues? */
762 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
766 for (i = 0; i < dev->num_tx_queues; i++) {
767 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
768 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
774 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
776 return qdisc_skb_cb(skb)->pkt_len;
779 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
780 enum net_xmit_qdisc_t {
781 __NET_XMIT_STOLEN = 0x00010000,
782 __NET_XMIT_BYPASS = 0x00020000,
785 #ifdef CONFIG_NET_CLS_ACT
786 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
788 #define net_xmit_drop_count(e) (1)
791 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
792 const struct Qdisc *sch)
794 #ifdef CONFIG_NET_SCHED
795 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
798 __qdisc_calculate_pkt_len(skb, stab);
802 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
803 struct sk_buff **to_free)
805 qdisc_calculate_pkt_len(skb, sch);
806 return sch->enqueue(skb, sch, to_free);
809 static inline void _bstats_update(struct gnet_stats_basic_sync *bstats,
810 __u64 bytes, __u32 packets)
812 u64_stats_update_begin(&bstats->syncp);
813 u64_stats_add(&bstats->bytes, bytes);
814 u64_stats_add(&bstats->packets, packets);
815 u64_stats_update_end(&bstats->syncp);
818 static inline void bstats_update(struct gnet_stats_basic_sync *bstats,
819 const struct sk_buff *skb)
821 _bstats_update(bstats,
823 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
826 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
827 const struct sk_buff *skb)
829 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb);
832 static inline void qdisc_bstats_update(struct Qdisc *sch,
833 const struct sk_buff *skb)
835 bstats_update(&sch->bstats, skb);
838 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
839 const struct sk_buff *skb)
841 sch->qstats.backlog -= qdisc_pkt_len(skb);
844 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
845 const struct sk_buff *skb)
847 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
850 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
851 const struct sk_buff *skb)
853 sch->qstats.backlog += qdisc_pkt_len(skb);
856 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
857 const struct sk_buff *skb)
859 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
862 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
864 this_cpu_inc(sch->cpu_qstats->qlen);
867 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
869 this_cpu_dec(sch->cpu_qstats->qlen);
872 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
874 this_cpu_inc(sch->cpu_qstats->requeues);
877 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
879 sch->qstats.drops += count;
882 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
887 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
889 qstats->overlimits++;
892 static inline void qdisc_qstats_drop(struct Qdisc *sch)
894 qstats_drop_inc(&sch->qstats);
897 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
899 this_cpu_inc(sch->cpu_qstats->drops);
902 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
904 sch->qstats.overlimits++;
907 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
909 __u32 qlen = qdisc_qlen_sum(sch);
911 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
914 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
917 struct gnet_stats_queue qstats = { 0 };
919 gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats);
920 *qlen = qstats.qlen + qdisc_qlen(sch);
921 *backlog = qstats.backlog;
924 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
928 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
929 qdisc_tree_reduce_backlog(sch, qlen, backlog);
932 static inline void qdisc_purge_queue(struct Qdisc *sch)
936 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
938 qdisc_tree_reduce_backlog(sch, qlen, backlog);
941 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
942 struct qdisc_skb_head *qh)
944 struct sk_buff *last = qh->tail;
957 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
959 __qdisc_enqueue_tail(skb, &sch->q);
960 qdisc_qstats_backlog_inc(sch, skb);
961 return NET_XMIT_SUCCESS;
964 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
965 struct qdisc_skb_head *qh)
967 skb->next = qh->head;
975 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
977 struct sk_buff *skb = qh->head;
979 if (likely(skb != NULL)) {
980 qh->head = skb->next;
982 if (qh->head == NULL)
990 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
992 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
994 if (likely(skb != NULL)) {
995 qdisc_qstats_backlog_dec(sch, skb);
996 qdisc_bstats_update(sch, skb);
1002 /* Instead of calling kfree_skb() while root qdisc lock is held,
1003 * queue the skb for future freeing at end of __dev_xmit_skb()
1005 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1007 skb->next = *to_free;
1011 static inline void __qdisc_drop_all(struct sk_buff *skb,
1012 struct sk_buff **to_free)
1015 skb->prev->next = *to_free;
1017 skb->next = *to_free;
1021 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1022 struct qdisc_skb_head *qh,
1023 struct sk_buff **to_free)
1025 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1027 if (likely(skb != NULL)) {
1028 unsigned int len = qdisc_pkt_len(skb);
1030 qdisc_qstats_backlog_dec(sch, skb);
1031 __qdisc_drop(skb, to_free);
1038 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1040 const struct qdisc_skb_head *qh = &sch->q;
1045 /* generic pseudo peek method for non-work-conserving qdisc */
1046 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1048 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1050 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1052 skb = sch->dequeue(sch);
1055 __skb_queue_head(&sch->gso_skb, skb);
1056 /* it's still part of the queue */
1057 qdisc_qstats_backlog_inc(sch, skb);
1065 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1066 struct sk_buff *skb)
1068 if (qdisc_is_percpu_stats(sch)) {
1069 qdisc_qstats_cpu_backlog_dec(sch, skb);
1070 qdisc_bstats_cpu_update(sch, skb);
1071 qdisc_qstats_cpu_qlen_dec(sch);
1073 qdisc_qstats_backlog_dec(sch, skb);
1074 qdisc_bstats_update(sch, skb);
1079 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1080 unsigned int pkt_len)
1082 if (qdisc_is_percpu_stats(sch)) {
1083 qdisc_qstats_cpu_qlen_inc(sch);
1084 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1086 sch->qstats.backlog += pkt_len;
1091 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1092 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1094 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1097 skb = __skb_dequeue(&sch->gso_skb);
1098 if (qdisc_is_percpu_stats(sch)) {
1099 qdisc_qstats_cpu_backlog_dec(sch, skb);
1100 qdisc_qstats_cpu_qlen_dec(sch);
1102 qdisc_qstats_backlog_dec(sch, skb);
1106 skb = sch->dequeue(sch);
1112 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1115 * We do not know the backlog in bytes of this list, it
1116 * is up to the caller to correct it
1120 rtnl_kfree_skbs(qh->head, qh->tail);
1128 static inline void qdisc_reset_queue(struct Qdisc *sch)
1130 __qdisc_reset_queue(&sch->q);
1133 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1134 struct Qdisc **pold)
1142 qdisc_purge_queue(old);
1143 sch_tree_unlock(sch);
1148 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1150 rtnl_kfree_skbs(skb, skb);
1151 qdisc_qstats_drop(sch);
1154 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1155 struct sk_buff **to_free)
1157 __qdisc_drop(skb, to_free);
1158 qdisc_qstats_cpu_drop(sch);
1160 return NET_XMIT_DROP;
1163 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1164 struct sk_buff **to_free)
1166 __qdisc_drop(skb, to_free);
1167 qdisc_qstats_drop(sch);
1169 return NET_XMIT_DROP;
1172 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1173 struct sk_buff **to_free)
1175 __qdisc_drop_all(skb, to_free);
1176 qdisc_qstats_drop(sch);
1178 return NET_XMIT_DROP;
1181 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1182 long it will take to send a packet given its size.
1184 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1186 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1189 slot >>= rtab->rate.cell_log;
1191 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1192 return rtab->data[slot];
1195 struct psched_ratecfg {
1196 u64 rate_bytes_ps; /* bytes per second */
1204 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1212 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1213 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1215 return ((u64)len * r->mult) >> r->shift;
1218 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1219 const struct tc_ratespec *conf,
1222 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1223 const struct psched_ratecfg *r)
1225 memset(res, 0, sizeof(*res));
1227 /* legacy struct tc_ratespec has a 32bit @rate field
1228 * Qdisc using 64bit rate should add new attributes
1229 * in order to maintain compatibility.
1231 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1233 res->overhead = r->overhead;
1235 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1238 struct psched_pktrate {
1239 u64 rate_pkts_ps; /* packets per second */
1244 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r,
1245 unsigned int pkt_num)
1247 return ((u64)pkt_num * r->mult) >> r->shift;
1250 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64);
1252 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1253 * The fast path only needs to access filter list and to update stats
1256 struct tcf_proto *filter_list;
1257 struct tcf_block *block;
1258 struct gnet_stats_basic_sync __percpu *cpu_bstats;
1259 struct gnet_stats_queue __percpu *cpu_qstats;
1260 unsigned long rcu_state;
1263 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1264 const struct sk_buff *skb)
1266 bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1269 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1271 this_cpu_inc(miniq->cpu_qstats->drops);
1274 struct mini_Qdisc_pair {
1275 struct mini_Qdisc miniq1;
1276 struct mini_Qdisc miniq2;
1277 struct mini_Qdisc __rcu **p_miniq;
1280 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1281 struct tcf_proto *tp_head);
1282 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1283 struct mini_Qdisc __rcu **p_miniq);
1284 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1285 struct tcf_block *block);
1287 void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx);
1289 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));
1291 /* Make sure qdisc is no longer in SCHED state. */
1292 static inline void qdisc_synchronize(const struct Qdisc *q)
1294 while (test_bit(__QDISC_STATE_SCHED, &q->state))