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);
312 int (*dump)(struct Qdisc *, struct sk_buff *);
313 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
315 void (*ingress_block_set)(struct Qdisc *sch,
317 void (*egress_block_set)(struct Qdisc *sch,
319 u32 (*ingress_block_get)(struct Qdisc *sch);
320 u32 (*egress_block_get)(struct Qdisc *sch);
322 struct module *owner;
332 const struct tcf_proto *goto_tp;
334 /* used in the skb_tc_reinsert function */
337 struct gnet_stats_queue *qstats;
344 struct tcf_proto_ops {
345 struct list_head head;
348 int (*classify)(struct sk_buff *,
349 const struct tcf_proto *,
350 struct tcf_result *);
351 int (*init)(struct tcf_proto*);
352 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
353 struct netlink_ext_ack *extack);
355 void* (*get)(struct tcf_proto*, u32 handle);
356 void (*put)(struct tcf_proto *tp, void *f);
357 int (*change)(struct net *net, struct sk_buff *,
358 struct tcf_proto*, unsigned long,
359 u32 handle, struct nlattr **,
361 struct netlink_ext_ack *);
362 int (*delete)(struct tcf_proto *tp, void *arg,
363 bool *last, bool rtnl_held,
364 struct netlink_ext_ack *);
365 bool (*delete_empty)(struct tcf_proto *tp);
366 void (*walk)(struct tcf_proto *tp,
367 struct tcf_walker *arg, bool rtnl_held);
368 int (*reoffload)(struct tcf_proto *tp, bool add,
369 flow_setup_cb_t *cb, void *cb_priv,
370 struct netlink_ext_ack *extack);
371 void (*hw_add)(struct tcf_proto *tp,
373 void (*hw_del)(struct tcf_proto *tp,
375 void (*bind_class)(void *, u32, unsigned long,
376 void *, unsigned long);
377 void * (*tmplt_create)(struct net *net,
378 struct tcf_chain *chain,
380 struct netlink_ext_ack *extack);
381 void (*tmplt_destroy)(void *tmplt_priv);
383 /* rtnetlink specific */
384 int (*dump)(struct net*, struct tcf_proto*, void *,
385 struct sk_buff *skb, struct tcmsg*,
387 int (*terse_dump)(struct net *net,
388 struct tcf_proto *tp, void *fh,
390 struct tcmsg *t, bool rtnl_held);
391 int (*tmplt_dump)(struct sk_buff *skb,
395 struct module *owner;
399 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
400 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
401 * conditions can occur when filters are inserted/deleted simultaneously.
403 enum tcf_proto_ops_flags {
404 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
408 /* Fast access part */
409 struct tcf_proto __rcu *next;
412 /* called under RCU BH lock*/
413 int (*classify)(struct sk_buff *,
414 const struct tcf_proto *,
415 struct tcf_result *);
421 const struct tcf_proto_ops *ops;
422 struct tcf_chain *chain;
423 /* Lock protects tcf_proto shared state and can be used by unlocked
424 * classifiers to protect their private data.
430 struct hlist_node destroy_ht_node;
433 struct qdisc_skb_cb {
435 unsigned int pkt_len;
436 u16 slave_dev_queue_mapping;
439 #define QDISC_CB_PRIV_LEN 20
440 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_init_scheduler(struct net_device *dev);
688 void dev_shutdown(struct net_device *dev);
689 void dev_activate(struct net_device *dev);
690 void dev_deactivate(struct net_device *dev);
691 void dev_deactivate_many(struct list_head *head);
692 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
693 struct Qdisc *qdisc);
694 void qdisc_reset(struct Qdisc *qdisc);
695 void qdisc_put(struct Qdisc *qdisc);
696 void qdisc_put_unlocked(struct Qdisc *qdisc);
697 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
698 #ifdef CONFIG_NET_SCHED
699 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
701 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
702 struct Qdisc *new, struct Qdisc *old,
703 enum tc_setup_type type, void *type_data,
704 struct netlink_ext_ack *extack);
707 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
710 q->flags &= ~TCQ_F_OFFLOADED;
715 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
716 struct Qdisc *new, struct Qdisc *old,
717 enum tc_setup_type type, void *type_data,
718 struct netlink_ext_ack *extack)
722 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
723 const struct Qdisc_ops *ops,
724 struct netlink_ext_ack *extack);
725 void qdisc_free(struct Qdisc *qdisc);
726 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
727 const struct Qdisc_ops *ops, u32 parentid,
728 struct netlink_ext_ack *extack);
729 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
730 const struct qdisc_size_table *stab);
731 int skb_do_redirect(struct sk_buff *);
733 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
735 #ifdef CONFIG_NET_CLS_ACT
736 return skb->tc_at_ingress;
742 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
744 #ifdef CONFIG_NET_CLS_ACT
745 if (skb->tc_skip_classify) {
746 skb->tc_skip_classify = 0;
753 /* Reset all TX qdiscs greater than index of a device. */
754 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
758 for (; i < dev->num_tx_queues; i++) {
759 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
761 spin_lock_bh(qdisc_lock(qdisc));
763 spin_unlock_bh(qdisc_lock(qdisc));
768 /* Are all TX queues of the device empty? */
769 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
774 for (i = 0; i < dev->num_tx_queues; i++) {
775 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
776 const struct Qdisc *q = rcu_dereference(txq->qdisc);
778 if (!qdisc_is_empty(q)) {
787 /* Are any of the TX qdiscs changing? */
788 static inline bool qdisc_tx_changing(const struct net_device *dev)
792 for (i = 0; i < dev->num_tx_queues; i++) {
793 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
794 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
800 /* Is the device using the noop qdisc on all queues? */
801 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
805 for (i = 0; i < dev->num_tx_queues; i++) {
806 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
807 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
813 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
815 return qdisc_skb_cb(skb)->pkt_len;
818 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
819 enum net_xmit_qdisc_t {
820 __NET_XMIT_STOLEN = 0x00010000,
821 __NET_XMIT_BYPASS = 0x00020000,
824 #ifdef CONFIG_NET_CLS_ACT
825 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
827 #define net_xmit_drop_count(e) (1)
830 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
831 const struct Qdisc *sch)
833 #ifdef CONFIG_NET_SCHED
834 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
837 __qdisc_calculate_pkt_len(skb, stab);
841 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
842 struct sk_buff **to_free)
844 qdisc_calculate_pkt_len(skb, sch);
845 return sch->enqueue(skb, sch, to_free);
848 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
849 __u64 bytes, __u32 packets)
851 bstats->bytes += bytes;
852 bstats->packets += packets;
855 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
856 const struct sk_buff *skb)
858 _bstats_update(bstats,
860 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
863 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
864 __u64 bytes, __u32 packets)
866 u64_stats_update_begin(&bstats->syncp);
867 _bstats_update(&bstats->bstats, bytes, packets);
868 u64_stats_update_end(&bstats->syncp);
871 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
872 const struct sk_buff *skb)
874 u64_stats_update_begin(&bstats->syncp);
875 bstats_update(&bstats->bstats, skb);
876 u64_stats_update_end(&bstats->syncp);
879 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
880 const struct sk_buff *skb)
882 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
885 static inline void qdisc_bstats_update(struct Qdisc *sch,
886 const struct sk_buff *skb)
888 bstats_update(&sch->bstats, skb);
891 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
892 const struct sk_buff *skb)
894 sch->qstats.backlog -= qdisc_pkt_len(skb);
897 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
898 const struct sk_buff *skb)
900 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
903 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
904 const struct sk_buff *skb)
906 sch->qstats.backlog += qdisc_pkt_len(skb);
909 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
910 const struct sk_buff *skb)
912 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
915 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
917 this_cpu_inc(sch->cpu_qstats->qlen);
920 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
922 this_cpu_dec(sch->cpu_qstats->qlen);
925 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
927 this_cpu_inc(sch->cpu_qstats->requeues);
930 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
932 sch->qstats.drops += count;
935 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
940 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
942 qstats->overlimits++;
945 static inline void qdisc_qstats_drop(struct Qdisc *sch)
947 qstats_drop_inc(&sch->qstats);
950 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
952 this_cpu_inc(sch->cpu_qstats->drops);
955 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
957 sch->qstats.overlimits++;
960 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
962 __u32 qlen = qdisc_qlen_sum(sch);
964 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
967 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
970 struct gnet_stats_queue qstats = { 0 };
971 __u32 len = qdisc_qlen_sum(sch);
973 __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
975 *backlog = qstats.backlog;
978 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
982 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
983 qdisc_tree_reduce_backlog(sch, qlen, backlog);
986 static inline void qdisc_purge_queue(struct Qdisc *sch)
990 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
992 qdisc_tree_reduce_backlog(sch, qlen, backlog);
995 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
1002 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
1003 struct qdisc_skb_head *qh)
1005 struct sk_buff *last = qh->tail;
1018 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
1020 __qdisc_enqueue_tail(skb, &sch->q);
1021 qdisc_qstats_backlog_inc(sch, skb);
1022 return NET_XMIT_SUCCESS;
1025 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
1026 struct qdisc_skb_head *qh)
1028 skb->next = qh->head;
1036 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
1038 struct sk_buff *skb = qh->head;
1040 if (likely(skb != NULL)) {
1041 qh->head = skb->next;
1043 if (qh->head == NULL)
1051 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1053 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1055 if (likely(skb != NULL)) {
1056 qdisc_qstats_backlog_dec(sch, skb);
1057 qdisc_bstats_update(sch, skb);
1063 /* Instead of calling kfree_skb() while root qdisc lock is held,
1064 * queue the skb for future freeing at end of __dev_xmit_skb()
1066 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1068 skb->next = *to_free;
1072 static inline void __qdisc_drop_all(struct sk_buff *skb,
1073 struct sk_buff **to_free)
1076 skb->prev->next = *to_free;
1078 skb->next = *to_free;
1082 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1083 struct qdisc_skb_head *qh,
1084 struct sk_buff **to_free)
1086 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1088 if (likely(skb != NULL)) {
1089 unsigned int len = qdisc_pkt_len(skb);
1091 qdisc_qstats_backlog_dec(sch, skb);
1092 __qdisc_drop(skb, to_free);
1099 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1101 const struct qdisc_skb_head *qh = &sch->q;
1106 /* generic pseudo peek method for non-work-conserving qdisc */
1107 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1109 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1111 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1113 skb = sch->dequeue(sch);
1116 __skb_queue_head(&sch->gso_skb, skb);
1117 /* it's still part of the queue */
1118 qdisc_qstats_backlog_inc(sch, skb);
1126 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1127 struct sk_buff *skb)
1129 if (qdisc_is_percpu_stats(sch)) {
1130 qdisc_qstats_cpu_backlog_dec(sch, skb);
1131 qdisc_bstats_cpu_update(sch, skb);
1132 qdisc_qstats_cpu_qlen_dec(sch);
1134 qdisc_qstats_backlog_dec(sch, skb);
1135 qdisc_bstats_update(sch, skb);
1140 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1141 unsigned int pkt_len)
1143 if (qdisc_is_percpu_stats(sch)) {
1144 qdisc_qstats_cpu_qlen_inc(sch);
1145 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1147 sch->qstats.backlog += pkt_len;
1152 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1153 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1155 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1158 skb = __skb_dequeue(&sch->gso_skb);
1159 if (qdisc_is_percpu_stats(sch)) {
1160 qdisc_qstats_cpu_backlog_dec(sch, skb);
1161 qdisc_qstats_cpu_qlen_dec(sch);
1163 qdisc_qstats_backlog_dec(sch, skb);
1167 skb = sch->dequeue(sch);
1173 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1176 * We do not know the backlog in bytes of this list, it
1177 * is up to the caller to correct it
1181 rtnl_kfree_skbs(qh->head, qh->tail);
1189 static inline void qdisc_reset_queue(struct Qdisc *sch)
1191 __qdisc_reset_queue(&sch->q);
1192 sch->qstats.backlog = 0;
1195 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1196 struct Qdisc **pold)
1204 qdisc_purge_queue(old);
1205 sch_tree_unlock(sch);
1210 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1212 rtnl_kfree_skbs(skb, skb);
1213 qdisc_qstats_drop(sch);
1216 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1217 struct sk_buff **to_free)
1219 __qdisc_drop(skb, to_free);
1220 qdisc_qstats_cpu_drop(sch);
1222 return NET_XMIT_DROP;
1225 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1226 struct sk_buff **to_free)
1228 __qdisc_drop(skb, to_free);
1229 qdisc_qstats_drop(sch);
1231 return NET_XMIT_DROP;
1234 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1235 struct sk_buff **to_free)
1237 __qdisc_drop_all(skb, to_free);
1238 qdisc_qstats_drop(sch);
1240 return NET_XMIT_DROP;
1243 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1244 long it will take to send a packet given its size.
1246 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1248 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1251 slot >>= rtab->rate.cell_log;
1253 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1254 return rtab->data[slot];
1257 struct psched_ratecfg {
1258 u64 rate_bytes_ps; /* bytes per second */
1265 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1270 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1271 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1273 return ((u64)len * r->mult) >> r->shift;
1276 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1277 const struct tc_ratespec *conf,
1280 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1281 const struct psched_ratecfg *r)
1283 memset(res, 0, sizeof(*res));
1285 /* legacy struct tc_ratespec has a 32bit @rate field
1286 * Qdisc using 64bit rate should add new attributes
1287 * in order to maintain compatibility.
1289 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1291 res->overhead = r->overhead;
1292 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1295 struct psched_pktrate {
1296 u64 rate_pkts_ps; /* packets per second */
1301 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r,
1302 unsigned int pkt_num)
1304 return ((u64)pkt_num * r->mult) >> r->shift;
1307 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64);
1309 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1310 * The fast path only needs to access filter list and to update stats
1313 struct tcf_proto *filter_list;
1314 struct tcf_block *block;
1315 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1316 struct gnet_stats_queue __percpu *cpu_qstats;
1317 struct rcu_head rcu;
1320 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1321 const struct sk_buff *skb)
1323 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1326 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1328 this_cpu_inc(miniq->cpu_qstats->drops);
1331 struct mini_Qdisc_pair {
1332 struct mini_Qdisc miniq1;
1333 struct mini_Qdisc miniq2;
1334 struct mini_Qdisc __rcu **p_miniq;
1337 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1338 struct tcf_proto *tp_head);
1339 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1340 struct mini_Qdisc __rcu **p_miniq);
1341 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1342 struct tcf_block *block);
1344 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));