1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __NET_SCHED_GENERIC_H
3 #define __NET_SCHED_GENERIC_H
5 #include <linux/netdevice.h>
6 #include <linux/types.h>
7 #include <linux/rcupdate.h>
8 #include <linux/pkt_sched.h>
9 #include <linux/pkt_cls.h>
10 #include <linux/percpu.h>
11 #include <linux/dynamic_queue_limits.h>
12 #include <linux/list.h>
13 #include <linux/refcount.h>
14 #include <linux/workqueue.h>
15 #include <linux/mutex.h>
16 #include <linux/rwsem.h>
17 #include <linux/atomic.h>
18 #include <linux/hashtable.h>
19 #include <net/gen_stats.h>
20 #include <net/rtnetlink.h>
21 #include <net/flow_offload.h>
29 struct qdisc_rate_table {
30 struct tc_ratespec rate;
32 struct qdisc_rate_table *next;
38 __QDISC_STATE_DEACTIVATED,
41 struct qdisc_size_table {
43 struct list_head list;
44 struct tc_sizespec szopts;
49 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
50 struct qdisc_skb_head {
58 int (*enqueue)(struct sk_buff *skb,
60 struct sk_buff **to_free);
61 struct sk_buff * (*dequeue)(struct Qdisc *sch);
63 #define TCQ_F_BUILTIN 1
64 #define TCQ_F_INGRESS 2
65 #define TCQ_F_CAN_BYPASS 4
66 #define TCQ_F_MQROOT 8
67 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
68 * q->dev_queue : It can test
69 * netif_xmit_frozen_or_stopped() before
70 * dequeueing next packet.
71 * Its true for MQ/MQPRIO slaves, or non
74 #define TCQ_F_WARN_NONWC (1 << 16)
75 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
76 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
77 * qdisc_tree_decrease_qlen() should stop.
79 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
80 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
81 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
83 const struct Qdisc_ops *ops;
84 struct qdisc_size_table __rcu *stab;
85 struct hlist_node hash;
89 struct netdev_queue *dev_queue;
91 struct net_rate_estimator __rcu *rate_est;
92 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
93 struct gnet_stats_queue __percpu *cpu_qstats;
98 * For performance sake on SMP, we put highly modified fields at the end
100 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
101 struct qdisc_skb_head q;
102 struct gnet_stats_basic_packed bstats;
104 struct gnet_stats_queue qstats;
106 struct Qdisc *next_sched;
107 struct sk_buff_head skb_bad_txq;
109 spinlock_t busylock ____cacheline_aligned_in_smp;
112 /* for NOLOCK qdisc, true if there are no enqueued skbs */
117 long privdata[] ____cacheline_aligned;
120 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
122 if (qdisc->flags & TCQ_F_BUILTIN)
124 refcount_inc(&qdisc->refcnt);
127 /* Intended to be used by unlocked users, when concurrent qdisc release is
131 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
133 if (qdisc->flags & TCQ_F_BUILTIN)
135 if (refcount_inc_not_zero(&qdisc->refcnt))
140 static inline bool qdisc_is_running(struct Qdisc *qdisc)
142 if (qdisc->flags & TCQ_F_NOLOCK)
143 return spin_is_locked(&qdisc->seqlock);
144 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
147 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
149 return q->flags & TCQ_F_CPUSTATS;
152 static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
154 if (qdisc_is_percpu_stats(qdisc))
155 return READ_ONCE(qdisc->empty);
156 return !READ_ONCE(qdisc->q.qlen);
159 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
161 if (qdisc->flags & TCQ_F_NOLOCK) {
162 if (!spin_trylock(&qdisc->seqlock))
164 WRITE_ONCE(qdisc->empty, false);
165 } else if (qdisc_is_running(qdisc)) {
168 /* Variant of write_seqcount_begin() telling lockdep a trylock
171 raw_write_seqcount_begin(&qdisc->running);
172 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
176 static inline void qdisc_run_end(struct Qdisc *qdisc)
178 write_seqcount_end(&qdisc->running);
179 if (qdisc->flags & TCQ_F_NOLOCK)
180 spin_unlock(&qdisc->seqlock);
183 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
185 return qdisc->flags & TCQ_F_ONETXQUEUE;
188 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
191 /* Non-BQL migrated drivers will return 0, too. */
192 return dql_avail(&txq->dql);
198 struct Qdisc_class_ops {
200 /* Child qdisc manipulation */
201 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
202 int (*graft)(struct Qdisc *, unsigned long cl,
203 struct Qdisc *, struct Qdisc **,
204 struct netlink_ext_ack *extack);
205 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
206 void (*qlen_notify)(struct Qdisc *, unsigned long);
208 /* Class manipulation routines */
209 unsigned long (*find)(struct Qdisc *, u32 classid);
210 int (*change)(struct Qdisc *, u32, u32,
211 struct nlattr **, unsigned long *,
212 struct netlink_ext_ack *);
213 int (*delete)(struct Qdisc *, unsigned long,
214 struct netlink_ext_ack *);
215 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
217 /* Filter manipulation */
218 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
220 struct netlink_ext_ack *extack);
221 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
223 void (*unbind_tcf)(struct Qdisc *, unsigned long);
225 /* rtnetlink specific */
226 int (*dump)(struct Qdisc *, unsigned long,
227 struct sk_buff *skb, struct tcmsg*);
228 int (*dump_stats)(struct Qdisc *, unsigned long,
232 /* Qdisc_class_ops flag values */
234 /* Implements API that doesn't require rtnl lock */
235 enum qdisc_class_ops_flags {
236 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
240 struct Qdisc_ops *next;
241 const struct Qdisc_class_ops *cl_ops;
244 unsigned int static_flags;
246 int (*enqueue)(struct sk_buff *skb,
248 struct sk_buff **to_free);
249 struct sk_buff * (*dequeue)(struct Qdisc *);
250 struct sk_buff * (*peek)(struct Qdisc *);
252 int (*init)(struct Qdisc *sch, struct nlattr *arg,
253 struct netlink_ext_ack *extack);
254 void (*reset)(struct Qdisc *);
255 void (*destroy)(struct Qdisc *);
256 int (*change)(struct Qdisc *sch,
258 struct netlink_ext_ack *extack);
259 void (*attach)(struct Qdisc *sch);
260 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
262 int (*dump)(struct Qdisc *, struct sk_buff *);
263 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
265 void (*ingress_block_set)(struct Qdisc *sch,
267 void (*egress_block_set)(struct Qdisc *sch,
269 u32 (*ingress_block_get)(struct Qdisc *sch);
270 u32 (*egress_block_get)(struct Qdisc *sch);
272 struct module *owner;
282 const struct tcf_proto *goto_tp;
284 /* used in the skb_tc_reinsert function */
287 struct gnet_stats_queue *qstats;
294 struct tcf_proto_ops {
295 struct list_head head;
298 int (*classify)(struct sk_buff *,
299 const struct tcf_proto *,
300 struct tcf_result *);
301 int (*init)(struct tcf_proto*);
302 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
303 struct netlink_ext_ack *extack);
305 void* (*get)(struct tcf_proto*, u32 handle);
306 void (*put)(struct tcf_proto *tp, void *f);
307 int (*change)(struct net *net, struct sk_buff *,
308 struct tcf_proto*, unsigned long,
309 u32 handle, struct nlattr **,
311 struct netlink_ext_ack *);
312 int (*delete)(struct tcf_proto *tp, void *arg,
313 bool *last, bool rtnl_held,
314 struct netlink_ext_ack *);
315 bool (*delete_empty)(struct tcf_proto *tp);
316 void (*walk)(struct tcf_proto *tp,
317 struct tcf_walker *arg, bool rtnl_held);
318 int (*reoffload)(struct tcf_proto *tp, bool add,
319 flow_setup_cb_t *cb, void *cb_priv,
320 struct netlink_ext_ack *extack);
321 void (*hw_add)(struct tcf_proto *tp,
323 void (*hw_del)(struct tcf_proto *tp,
325 void (*bind_class)(void *, u32, unsigned long,
326 void *, unsigned long);
327 void * (*tmplt_create)(struct net *net,
328 struct tcf_chain *chain,
330 struct netlink_ext_ack *extack);
331 void (*tmplt_destroy)(void *tmplt_priv);
333 /* rtnetlink specific */
334 int (*dump)(struct net*, struct tcf_proto*, void *,
335 struct sk_buff *skb, struct tcmsg*,
337 int (*terse_dump)(struct net *net,
338 struct tcf_proto *tp, void *fh,
340 struct tcmsg *t, bool rtnl_held);
341 int (*tmplt_dump)(struct sk_buff *skb,
345 struct module *owner;
349 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
350 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
351 * conditions can occur when filters are inserted/deleted simultaneously.
353 enum tcf_proto_ops_flags {
354 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
358 /* Fast access part */
359 struct tcf_proto __rcu *next;
362 /* called under RCU BH lock*/
363 int (*classify)(struct sk_buff *,
364 const struct tcf_proto *,
365 struct tcf_result *);
371 const struct tcf_proto_ops *ops;
372 struct tcf_chain *chain;
373 /* Lock protects tcf_proto shared state and can be used by unlocked
374 * classifiers to protect their private data.
380 struct hlist_node destroy_ht_node;
383 struct qdisc_skb_cb {
385 unsigned int pkt_len;
386 u16 slave_dev_queue_mapping;
389 #define QDISC_CB_PRIV_LEN 20
390 unsigned char data[QDISC_CB_PRIV_LEN];
395 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
398 /* Protects filter_chain. */
399 struct mutex filter_chain_lock;
400 struct tcf_proto __rcu *filter_chain;
401 struct list_head list;
402 struct tcf_block *block;
403 u32 index; /* chain index */
405 unsigned int action_refcnt;
406 bool explicitly_created;
408 const struct tcf_proto_ops *tmplt_ops;
414 /* Lock protects tcf_block and lifetime-management data of chains
415 * attached to the block (refcnt, action_refcnt, explicitly_created).
418 struct list_head chain_list;
419 u32 index; /* block index for shared blocks */
420 u32 classid; /* which class this block belongs to */
424 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
425 struct flow_block flow_block;
426 struct list_head owner_list;
428 atomic_t offloadcnt; /* Number of oddloaded filters */
429 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
430 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
432 struct tcf_chain *chain;
433 struct list_head filter_chain_list;
436 DECLARE_HASHTABLE(proto_destroy_ht, 7);
437 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
440 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
442 return lockdep_is_held(&chain->filter_chain_lock);
445 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
447 return lockdep_is_held(&tp->lock);
450 #define tcf_chain_dereference(p, chain) \
451 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
453 #define tcf_proto_dereference(p, tp) \
454 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
456 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
458 struct qdisc_skb_cb *qcb;
460 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb));
461 BUILD_BUG_ON(sizeof(qcb->data) < sz);
464 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
466 return this_cpu_ptr(q->cpu_qstats)->qlen;
469 static inline int qdisc_qlen(const struct Qdisc *q)
474 static inline int qdisc_qlen_sum(const struct Qdisc *q)
476 __u32 qlen = q->qstats.qlen;
479 if (qdisc_is_percpu_stats(q)) {
480 for_each_possible_cpu(i)
481 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
489 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
491 return (struct qdisc_skb_cb *)skb->cb;
494 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
496 return &qdisc->q.lock;
499 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
501 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
506 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
508 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
511 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
513 return qdisc->dev_queue->qdisc_sleeping;
516 /* The qdisc root lock is a mechanism by which to top level
517 * of a qdisc tree can be locked from any qdisc node in the
518 * forest. This allows changing the configuration of some
519 * aspect of the qdisc tree while blocking out asynchronous
520 * qdisc access in the packet processing paths.
522 * It is only legal to do this when the root will not change
523 * on us. Otherwise we'll potentially lock the wrong qdisc
524 * root. This is enforced by holding the RTNL semaphore, which
525 * all users of this lock accessor must do.
527 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
529 struct Qdisc *root = qdisc_root(qdisc);
532 return qdisc_lock(root);
535 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
537 struct Qdisc *root = qdisc_root_sleeping(qdisc);
540 return qdisc_lock(root);
543 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
545 struct Qdisc *root = qdisc_root_sleeping(qdisc);
548 return &root->running;
551 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
553 return qdisc->dev_queue->dev;
556 static inline void sch_tree_lock(struct Qdisc *q)
558 if (q->flags & TCQ_F_MQROOT)
559 spin_lock_bh(qdisc_lock(q));
561 spin_lock_bh(qdisc_root_sleeping_lock(q));
564 static inline void sch_tree_unlock(struct Qdisc *q)
566 if (q->flags & TCQ_F_MQROOT)
567 spin_unlock_bh(qdisc_lock(q));
569 spin_unlock_bh(qdisc_root_sleeping_lock(q));
572 extern struct Qdisc noop_qdisc;
573 extern struct Qdisc_ops noop_qdisc_ops;
574 extern struct Qdisc_ops pfifo_fast_ops;
575 extern struct Qdisc_ops mq_qdisc_ops;
576 extern struct Qdisc_ops noqueue_qdisc_ops;
577 extern const struct Qdisc_ops *default_qdisc_ops;
578 static inline const struct Qdisc_ops *
579 get_default_qdisc_ops(const struct net_device *dev, int ntx)
581 return ntx < dev->real_num_tx_queues ?
582 default_qdisc_ops : &pfifo_fast_ops;
585 struct Qdisc_class_common {
587 struct hlist_node hnode;
590 struct Qdisc_class_hash {
591 struct hlist_head *hash;
592 unsigned int hashsize;
593 unsigned int hashmask;
594 unsigned int hashelems;
597 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
604 static inline struct Qdisc_class_common *
605 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
607 struct Qdisc_class_common *cl;
613 h = qdisc_class_hash(id, hash->hashmask);
614 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
615 if (cl->classid == id)
621 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
623 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
625 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
628 int qdisc_class_hash_init(struct Qdisc_class_hash *);
629 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
630 struct Qdisc_class_common *);
631 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
632 struct Qdisc_class_common *);
633 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
634 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
636 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
637 void dev_init_scheduler(struct net_device *dev);
638 void dev_shutdown(struct net_device *dev);
639 void dev_activate(struct net_device *dev);
640 void dev_deactivate(struct net_device *dev);
641 void dev_deactivate_many(struct list_head *head);
642 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
643 struct Qdisc *qdisc);
644 void qdisc_reset(struct Qdisc *qdisc);
645 void qdisc_put(struct Qdisc *qdisc);
646 void qdisc_put_unlocked(struct Qdisc *qdisc);
647 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
648 #ifdef CONFIG_NET_SCHED
649 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
651 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
652 struct Qdisc *new, struct Qdisc *old,
653 enum tc_setup_type type, void *type_data,
654 struct netlink_ext_ack *extack);
657 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
660 q->flags &= ~TCQ_F_OFFLOADED;
665 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
666 struct Qdisc *new, struct Qdisc *old,
667 enum tc_setup_type type, void *type_data,
668 struct netlink_ext_ack *extack)
672 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
673 const struct Qdisc_ops *ops,
674 struct netlink_ext_ack *extack);
675 void qdisc_free(struct Qdisc *qdisc);
676 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
677 const struct Qdisc_ops *ops, u32 parentid,
678 struct netlink_ext_ack *extack);
679 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
680 const struct qdisc_size_table *stab);
681 int skb_do_redirect(struct sk_buff *);
683 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
685 #ifdef CONFIG_NET_CLS_ACT
686 return skb->tc_at_ingress;
692 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
694 #ifdef CONFIG_NET_CLS_ACT
695 if (skb->tc_skip_classify) {
696 skb->tc_skip_classify = 0;
703 /* Reset all TX qdiscs greater than index of a device. */
704 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
708 for (; i < dev->num_tx_queues; i++) {
709 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
711 spin_lock_bh(qdisc_lock(qdisc));
713 spin_unlock_bh(qdisc_lock(qdisc));
718 /* Are all TX queues of the device empty? */
719 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
724 for (i = 0; i < dev->num_tx_queues; i++) {
725 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
726 const struct Qdisc *q = rcu_dereference(txq->qdisc);
728 if (!qdisc_is_empty(q)) {
737 /* Are any of the TX qdiscs changing? */
738 static inline bool qdisc_tx_changing(const struct net_device *dev)
742 for (i = 0; i < dev->num_tx_queues; i++) {
743 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
744 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
750 /* Is the device using the noop qdisc on all queues? */
751 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
755 for (i = 0; i < dev->num_tx_queues; i++) {
756 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
757 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
763 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
765 return qdisc_skb_cb(skb)->pkt_len;
768 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
769 enum net_xmit_qdisc_t {
770 __NET_XMIT_STOLEN = 0x00010000,
771 __NET_XMIT_BYPASS = 0x00020000,
774 #ifdef CONFIG_NET_CLS_ACT
775 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
777 #define net_xmit_drop_count(e) (1)
780 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
781 const struct Qdisc *sch)
783 #ifdef CONFIG_NET_SCHED
784 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
787 __qdisc_calculate_pkt_len(skb, stab);
791 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
792 struct sk_buff **to_free)
794 qdisc_calculate_pkt_len(skb, sch);
795 return sch->enqueue(skb, sch, to_free);
798 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
799 __u64 bytes, __u32 packets)
801 bstats->bytes += bytes;
802 bstats->packets += packets;
805 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
806 const struct sk_buff *skb)
808 _bstats_update(bstats,
810 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
813 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
814 __u64 bytes, __u32 packets)
816 u64_stats_update_begin(&bstats->syncp);
817 _bstats_update(&bstats->bstats, bytes, packets);
818 u64_stats_update_end(&bstats->syncp);
821 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
822 const struct sk_buff *skb)
824 u64_stats_update_begin(&bstats->syncp);
825 bstats_update(&bstats->bstats, skb);
826 u64_stats_update_end(&bstats->syncp);
829 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
830 const struct sk_buff *skb)
832 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
835 static inline void qdisc_bstats_update(struct Qdisc *sch,
836 const struct sk_buff *skb)
838 bstats_update(&sch->bstats, skb);
841 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
842 const struct sk_buff *skb)
844 sch->qstats.backlog -= qdisc_pkt_len(skb);
847 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
848 const struct sk_buff *skb)
850 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
853 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
854 const struct sk_buff *skb)
856 sch->qstats.backlog += qdisc_pkt_len(skb);
859 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
860 const struct sk_buff *skb)
862 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
865 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
867 this_cpu_inc(sch->cpu_qstats->qlen);
870 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
872 this_cpu_dec(sch->cpu_qstats->qlen);
875 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
877 this_cpu_inc(sch->cpu_qstats->requeues);
880 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
882 sch->qstats.drops += count;
885 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
890 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
892 qstats->overlimits++;
895 static inline void qdisc_qstats_drop(struct Qdisc *sch)
897 qstats_drop_inc(&sch->qstats);
900 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
902 this_cpu_inc(sch->cpu_qstats->drops);
905 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
907 sch->qstats.overlimits++;
910 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
912 __u32 qlen = qdisc_qlen_sum(sch);
914 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
917 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
920 struct gnet_stats_queue qstats = { 0 };
921 __u32 len = qdisc_qlen_sum(sch);
923 __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
925 *backlog = qstats.backlog;
928 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
932 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
933 qdisc_tree_reduce_backlog(sch, qlen, backlog);
936 static inline void qdisc_purge_queue(struct Qdisc *sch)
940 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
942 qdisc_tree_reduce_backlog(sch, qlen, backlog);
945 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
952 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
953 struct qdisc_skb_head *qh)
955 struct sk_buff *last = qh->tail;
968 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
970 __qdisc_enqueue_tail(skb, &sch->q);
971 qdisc_qstats_backlog_inc(sch, skb);
972 return NET_XMIT_SUCCESS;
975 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
976 struct qdisc_skb_head *qh)
978 skb->next = qh->head;
986 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
988 struct sk_buff *skb = qh->head;
990 if (likely(skb != NULL)) {
991 qh->head = skb->next;
993 if (qh->head == NULL)
1001 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1003 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1005 if (likely(skb != NULL)) {
1006 qdisc_qstats_backlog_dec(sch, skb);
1007 qdisc_bstats_update(sch, skb);
1013 /* Instead of calling kfree_skb() while root qdisc lock is held,
1014 * queue the skb for future freeing at end of __dev_xmit_skb()
1016 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1018 skb->next = *to_free;
1022 static inline void __qdisc_drop_all(struct sk_buff *skb,
1023 struct sk_buff **to_free)
1026 skb->prev->next = *to_free;
1028 skb->next = *to_free;
1032 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1033 struct qdisc_skb_head *qh,
1034 struct sk_buff **to_free)
1036 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1038 if (likely(skb != NULL)) {
1039 unsigned int len = qdisc_pkt_len(skb);
1041 qdisc_qstats_backlog_dec(sch, skb);
1042 __qdisc_drop(skb, to_free);
1049 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1051 const struct qdisc_skb_head *qh = &sch->q;
1056 /* generic pseudo peek method for non-work-conserving qdisc */
1057 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1059 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1061 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1063 skb = sch->dequeue(sch);
1066 __skb_queue_head(&sch->gso_skb, skb);
1067 /* it's still part of the queue */
1068 qdisc_qstats_backlog_inc(sch, skb);
1076 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1077 struct sk_buff *skb)
1079 if (qdisc_is_percpu_stats(sch)) {
1080 qdisc_qstats_cpu_backlog_dec(sch, skb);
1081 qdisc_bstats_cpu_update(sch, skb);
1082 qdisc_qstats_cpu_qlen_dec(sch);
1084 qdisc_qstats_backlog_dec(sch, skb);
1085 qdisc_bstats_update(sch, skb);
1090 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1091 unsigned int pkt_len)
1093 if (qdisc_is_percpu_stats(sch)) {
1094 qdisc_qstats_cpu_qlen_inc(sch);
1095 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1097 sch->qstats.backlog += pkt_len;
1102 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1103 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1105 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1108 skb = __skb_dequeue(&sch->gso_skb);
1109 if (qdisc_is_percpu_stats(sch)) {
1110 qdisc_qstats_cpu_backlog_dec(sch, skb);
1111 qdisc_qstats_cpu_qlen_dec(sch);
1113 qdisc_qstats_backlog_dec(sch, skb);
1117 skb = sch->dequeue(sch);
1123 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1126 * We do not know the backlog in bytes of this list, it
1127 * is up to the caller to correct it
1131 rtnl_kfree_skbs(qh->head, qh->tail);
1139 static inline void qdisc_reset_queue(struct Qdisc *sch)
1141 __qdisc_reset_queue(&sch->q);
1142 sch->qstats.backlog = 0;
1145 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1146 struct Qdisc **pold)
1154 qdisc_purge_queue(old);
1155 sch_tree_unlock(sch);
1160 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1162 rtnl_kfree_skbs(skb, skb);
1163 qdisc_qstats_drop(sch);
1166 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1167 struct sk_buff **to_free)
1169 __qdisc_drop(skb, to_free);
1170 qdisc_qstats_cpu_drop(sch);
1172 return NET_XMIT_DROP;
1175 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1176 struct sk_buff **to_free)
1178 __qdisc_drop(skb, to_free);
1179 qdisc_qstats_drop(sch);
1181 return NET_XMIT_DROP;
1184 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1185 struct sk_buff **to_free)
1187 __qdisc_drop_all(skb, to_free);
1188 qdisc_qstats_drop(sch);
1190 return NET_XMIT_DROP;
1193 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1194 long it will take to send a packet given its size.
1196 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1198 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1201 slot >>= rtab->rate.cell_log;
1203 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1204 return rtab->data[slot];
1207 struct psched_ratecfg {
1208 u64 rate_bytes_ps; /* bytes per second */
1215 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1220 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1221 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1223 return ((u64)len * r->mult) >> r->shift;
1226 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1227 const struct tc_ratespec *conf,
1230 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1231 const struct psched_ratecfg *r)
1233 memset(res, 0, sizeof(*res));
1235 /* legacy struct tc_ratespec has a 32bit @rate field
1236 * Qdisc using 64bit rate should add new attributes
1237 * in order to maintain compatibility.
1239 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1241 res->overhead = r->overhead;
1242 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1245 struct psched_pktrate {
1246 u64 rate_pkts_ps; /* packets per second */
1251 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r,
1252 unsigned int pkt_num)
1254 return ((u64)pkt_num * r->mult) >> r->shift;
1257 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64);
1259 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1260 * The fast path only needs to access filter list and to update stats
1263 struct tcf_proto *filter_list;
1264 struct tcf_block *block;
1265 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1266 struct gnet_stats_queue __percpu *cpu_qstats;
1267 struct rcu_head rcu;
1270 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1271 const struct sk_buff *skb)
1273 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1276 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1278 this_cpu_inc(miniq->cpu_qstats->drops);
1281 struct mini_Qdisc_pair {
1282 struct mini_Qdisc miniq1;
1283 struct mini_Qdisc miniq2;
1284 struct mini_Qdisc __rcu **p_miniq;
1287 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1288 struct tcf_proto *tp_head);
1289 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1290 struct mini_Qdisc __rcu **p_miniq);
1291 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1292 struct tcf_block *block);
1294 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));