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;
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 /* Paired with smp_mb__after_atomic() to make sure
191 * STATE_MISSED checking is synchronized with clearing
192 * in pfifo_fast_dequeue().
194 smp_mb__before_atomic();
196 /* If the MISSED flag is set, it means other thread has
197 * set the MISSED flag before second spin_trylock(), so
198 * we can return false here to avoid multi cpus doing
199 * the set_bit() and second spin_trylock() concurrently.
201 if (test_bit(__QDISC_STATE_MISSED, &qdisc->state))
204 /* Set the MISSED flag before the second spin_trylock(),
205 * if the second spin_trylock() return false, it means
206 * other cpu holding the lock will do dequeuing for us
207 * or it will see the MISSED flag set after releasing
208 * lock and reschedule the net_tx_action() to do the
211 set_bit(__QDISC_STATE_MISSED, &qdisc->state);
213 /* spin_trylock() only has load-acquire semantic, so use
214 * smp_mb__after_atomic() to ensure STATE_MISSED is set
215 * before doing the second spin_trylock().
217 smp_mb__after_atomic();
219 /* Retry again in case other CPU may not see the new flag
220 * after it releases the lock at the end of qdisc_run_end().
222 return spin_trylock(&qdisc->seqlock);
224 return !__test_and_set_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
227 static inline void qdisc_run_end(struct Qdisc *qdisc)
229 if (qdisc->flags & TCQ_F_NOLOCK) {
230 spin_unlock(&qdisc->seqlock);
232 if (unlikely(test_bit(__QDISC_STATE_MISSED,
234 __netif_schedule(qdisc);
236 __clear_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
240 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
242 return qdisc->flags & TCQ_F_ONETXQUEUE;
245 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
248 /* Non-BQL migrated drivers will return 0, too. */
249 return dql_avail(&txq->dql);
255 struct Qdisc_class_ops {
257 /* Child qdisc manipulation */
258 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
259 int (*graft)(struct Qdisc *, unsigned long cl,
260 struct Qdisc *, struct Qdisc **,
261 struct netlink_ext_ack *extack);
262 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
263 void (*qlen_notify)(struct Qdisc *, unsigned long);
265 /* Class manipulation routines */
266 unsigned long (*find)(struct Qdisc *, u32 classid);
267 int (*change)(struct Qdisc *, u32, u32,
268 struct nlattr **, unsigned long *,
269 struct netlink_ext_ack *);
270 int (*delete)(struct Qdisc *, unsigned long,
271 struct netlink_ext_ack *);
272 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
274 /* Filter manipulation */
275 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
277 struct netlink_ext_ack *extack);
278 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
280 void (*unbind_tcf)(struct Qdisc *, unsigned long);
282 /* rtnetlink specific */
283 int (*dump)(struct Qdisc *, unsigned long,
284 struct sk_buff *skb, struct tcmsg*);
285 int (*dump_stats)(struct Qdisc *, unsigned long,
289 /* Qdisc_class_ops flag values */
291 /* Implements API that doesn't require rtnl lock */
292 enum qdisc_class_ops_flags {
293 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
297 struct Qdisc_ops *next;
298 const struct Qdisc_class_ops *cl_ops;
301 unsigned int static_flags;
303 int (*enqueue)(struct sk_buff *skb,
305 struct sk_buff **to_free);
306 struct sk_buff * (*dequeue)(struct Qdisc *);
307 struct sk_buff * (*peek)(struct Qdisc *);
309 int (*init)(struct Qdisc *sch, struct nlattr *arg,
310 struct netlink_ext_ack *extack);
311 void (*reset)(struct Qdisc *);
312 void (*destroy)(struct Qdisc *);
313 int (*change)(struct Qdisc *sch,
315 struct netlink_ext_ack *extack);
316 void (*attach)(struct Qdisc *sch);
317 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
318 void (*change_real_num_tx)(struct Qdisc *sch,
319 unsigned int new_real_tx);
321 int (*dump)(struct Qdisc *, struct sk_buff *);
322 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
324 void (*ingress_block_set)(struct Qdisc *sch,
326 void (*egress_block_set)(struct Qdisc *sch,
328 u32 (*ingress_block_get)(struct Qdisc *sch);
329 u32 (*egress_block_get)(struct Qdisc *sch);
331 struct module *owner;
341 const struct tcf_proto *goto_tp;
343 /* used in the skb_tc_reinsert function */
346 struct gnet_stats_queue *qstats;
353 struct tcf_proto_ops {
354 struct list_head head;
357 int (*classify)(struct sk_buff *,
358 const struct tcf_proto *,
359 struct tcf_result *);
360 int (*init)(struct tcf_proto*);
361 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
362 struct netlink_ext_ack *extack);
364 void* (*get)(struct tcf_proto*, u32 handle);
365 void (*put)(struct tcf_proto *tp, void *f);
366 int (*change)(struct net *net, struct sk_buff *,
367 struct tcf_proto*, unsigned long,
368 u32 handle, struct nlattr **,
370 struct netlink_ext_ack *);
371 int (*delete)(struct tcf_proto *tp, void *arg,
372 bool *last, bool rtnl_held,
373 struct netlink_ext_ack *);
374 bool (*delete_empty)(struct tcf_proto *tp);
375 void (*walk)(struct tcf_proto *tp,
376 struct tcf_walker *arg, bool rtnl_held);
377 int (*reoffload)(struct tcf_proto *tp, bool add,
378 flow_setup_cb_t *cb, void *cb_priv,
379 struct netlink_ext_ack *extack);
380 void (*hw_add)(struct tcf_proto *tp,
382 void (*hw_del)(struct tcf_proto *tp,
384 void (*bind_class)(void *, u32, unsigned long,
385 void *, unsigned long);
386 void * (*tmplt_create)(struct net *net,
387 struct tcf_chain *chain,
389 struct netlink_ext_ack *extack);
390 void (*tmplt_destroy)(void *tmplt_priv);
392 /* rtnetlink specific */
393 int (*dump)(struct net*, struct tcf_proto*, void *,
394 struct sk_buff *skb, struct tcmsg*,
396 int (*terse_dump)(struct net *net,
397 struct tcf_proto *tp, void *fh,
399 struct tcmsg *t, bool rtnl_held);
400 int (*tmplt_dump)(struct sk_buff *skb,
404 struct module *owner;
408 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
409 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
410 * conditions can occur when filters are inserted/deleted simultaneously.
412 enum tcf_proto_ops_flags {
413 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
417 /* Fast access part */
418 struct tcf_proto __rcu *next;
421 /* called under RCU BH lock*/
422 int (*classify)(struct sk_buff *,
423 const struct tcf_proto *,
424 struct tcf_result *);
430 const struct tcf_proto_ops *ops;
431 struct tcf_chain *chain;
432 /* Lock protects tcf_proto shared state and can be used by unlocked
433 * classifiers to protect their private data.
439 struct hlist_node destroy_ht_node;
442 struct qdisc_skb_cb {
444 unsigned int pkt_len;
445 u16 slave_dev_queue_mapping;
448 #define QDISC_CB_PRIV_LEN 20
449 unsigned char data[QDISC_CB_PRIV_LEN];
454 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
457 /* Protects filter_chain. */
458 struct mutex filter_chain_lock;
459 struct tcf_proto __rcu *filter_chain;
460 struct list_head list;
461 struct tcf_block *block;
462 u32 index; /* chain index */
464 unsigned int action_refcnt;
465 bool explicitly_created;
467 const struct tcf_proto_ops *tmplt_ops;
473 /* Lock protects tcf_block and lifetime-management data of chains
474 * attached to the block (refcnt, action_refcnt, explicitly_created).
477 struct list_head chain_list;
478 u32 index; /* block index for shared blocks */
479 u32 classid; /* which class this block belongs to */
483 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
484 struct flow_block flow_block;
485 struct list_head owner_list;
487 atomic_t offloadcnt; /* Number of oddloaded filters */
488 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
489 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
491 struct tcf_chain *chain;
492 struct list_head filter_chain_list;
495 DECLARE_HASHTABLE(proto_destroy_ht, 7);
496 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
499 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
501 return lockdep_is_held(&chain->filter_chain_lock);
504 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
506 return lockdep_is_held(&tp->lock);
509 #define tcf_chain_dereference(p, chain) \
510 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
512 #define tcf_proto_dereference(p, tp) \
513 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
515 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
517 struct qdisc_skb_cb *qcb;
519 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb));
520 BUILD_BUG_ON(sizeof(qcb->data) < sz);
523 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
525 return this_cpu_ptr(q->cpu_qstats)->qlen;
528 static inline int qdisc_qlen(const struct Qdisc *q)
533 static inline int qdisc_qlen_sum(const struct Qdisc *q)
535 __u32 qlen = q->qstats.qlen;
538 if (qdisc_is_percpu_stats(q)) {
539 for_each_possible_cpu(i)
540 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
548 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
550 return (struct qdisc_skb_cb *)skb->cb;
553 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
555 return &qdisc->q.lock;
558 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
560 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
565 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
567 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
570 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
572 return qdisc->dev_queue->qdisc_sleeping;
575 /* The qdisc root lock is a mechanism by which to top level
576 * of a qdisc tree can be locked from any qdisc node in the
577 * forest. This allows changing the configuration of some
578 * aspect of the qdisc tree while blocking out asynchronous
579 * qdisc access in the packet processing paths.
581 * It is only legal to do this when the root will not change
582 * on us. Otherwise we'll potentially lock the wrong qdisc
583 * root. This is enforced by holding the RTNL semaphore, which
584 * all users of this lock accessor must do.
586 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
588 struct Qdisc *root = qdisc_root(qdisc);
591 return qdisc_lock(root);
594 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
596 struct Qdisc *root = qdisc_root_sleeping(qdisc);
599 return qdisc_lock(root);
602 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
604 return qdisc->dev_queue->dev;
607 static inline void sch_tree_lock(struct Qdisc *q)
609 if (q->flags & TCQ_F_MQROOT)
610 spin_lock_bh(qdisc_lock(q));
612 spin_lock_bh(qdisc_root_sleeping_lock(q));
615 static inline void sch_tree_unlock(struct Qdisc *q)
617 if (q->flags & TCQ_F_MQROOT)
618 spin_unlock_bh(qdisc_lock(q));
620 spin_unlock_bh(qdisc_root_sleeping_lock(q));
623 extern struct Qdisc noop_qdisc;
624 extern struct Qdisc_ops noop_qdisc_ops;
625 extern struct Qdisc_ops pfifo_fast_ops;
626 extern struct Qdisc_ops mq_qdisc_ops;
627 extern struct Qdisc_ops noqueue_qdisc_ops;
628 extern const struct Qdisc_ops *default_qdisc_ops;
629 static inline const struct Qdisc_ops *
630 get_default_qdisc_ops(const struct net_device *dev, int ntx)
632 return ntx < dev->real_num_tx_queues ?
633 default_qdisc_ops : &pfifo_fast_ops;
636 struct Qdisc_class_common {
638 struct hlist_node hnode;
641 struct Qdisc_class_hash {
642 struct hlist_head *hash;
643 unsigned int hashsize;
644 unsigned int hashmask;
645 unsigned int hashelems;
648 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
655 static inline struct Qdisc_class_common *
656 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
658 struct Qdisc_class_common *cl;
664 h = qdisc_class_hash(id, hash->hashmask);
665 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
666 if (cl->classid == id)
672 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
674 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
676 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
679 int qdisc_class_hash_init(struct Qdisc_class_hash *);
680 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
681 struct Qdisc_class_common *);
682 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
683 struct Qdisc_class_common *);
684 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
685 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
687 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
688 void dev_qdisc_change_real_num_tx(struct net_device *dev,
689 unsigned int new_real_tx);
690 void dev_init_scheduler(struct net_device *dev);
691 void dev_shutdown(struct net_device *dev);
692 void dev_activate(struct net_device *dev);
693 void dev_deactivate(struct net_device *dev);
694 void dev_deactivate_many(struct list_head *head);
695 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
696 struct Qdisc *qdisc);
697 void qdisc_reset(struct Qdisc *qdisc);
698 void qdisc_put(struct Qdisc *qdisc);
699 void qdisc_put_unlocked(struct Qdisc *qdisc);
700 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
701 #ifdef CONFIG_NET_SCHED
702 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
704 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
705 struct Qdisc *new, struct Qdisc *old,
706 enum tc_setup_type type, void *type_data,
707 struct netlink_ext_ack *extack);
710 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
713 q->flags &= ~TCQ_F_OFFLOADED;
718 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
719 struct Qdisc *new, struct Qdisc *old,
720 enum tc_setup_type type, void *type_data,
721 struct netlink_ext_ack *extack)
725 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
726 const struct Qdisc_ops *ops,
727 struct netlink_ext_ack *extack);
728 void qdisc_free(struct Qdisc *qdisc);
729 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
730 const struct Qdisc_ops *ops, u32 parentid,
731 struct netlink_ext_ack *extack);
732 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
733 const struct qdisc_size_table *stab);
734 int skb_do_redirect(struct sk_buff *);
736 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
738 #ifdef CONFIG_NET_CLS_ACT
739 return skb->tc_at_ingress;
745 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
747 #ifdef CONFIG_NET_CLS_ACT
748 if (skb->tc_skip_classify) {
749 skb->tc_skip_classify = 0;
756 /* Reset all TX qdiscs greater than index of a device. */
757 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
761 for (; i < dev->num_tx_queues; i++) {
762 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
764 spin_lock_bh(qdisc_lock(qdisc));
766 spin_unlock_bh(qdisc_lock(qdisc));
771 /* Are all TX queues of the device empty? */
772 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
777 for (i = 0; i < dev->num_tx_queues; i++) {
778 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
779 const struct Qdisc *q = rcu_dereference(txq->qdisc);
781 if (!qdisc_is_empty(q)) {
790 /* Are any of the TX qdiscs changing? */
791 static inline bool qdisc_tx_changing(const struct net_device *dev)
795 for (i = 0; i < dev->num_tx_queues; i++) {
796 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
797 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
803 /* Is the device using the noop qdisc on all queues? */
804 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
808 for (i = 0; i < dev->num_tx_queues; i++) {
809 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
810 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
816 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
818 return qdisc_skb_cb(skb)->pkt_len;
821 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
822 enum net_xmit_qdisc_t {
823 __NET_XMIT_STOLEN = 0x00010000,
824 __NET_XMIT_BYPASS = 0x00020000,
827 #ifdef CONFIG_NET_CLS_ACT
828 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
830 #define net_xmit_drop_count(e) (1)
833 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
834 const struct Qdisc *sch)
836 #ifdef CONFIG_NET_SCHED
837 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
840 __qdisc_calculate_pkt_len(skb, stab);
844 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
845 struct sk_buff **to_free)
847 qdisc_calculate_pkt_len(skb, sch);
848 return sch->enqueue(skb, sch, to_free);
851 static inline void _bstats_update(struct gnet_stats_basic_sync *bstats,
852 __u64 bytes, __u32 packets)
854 u64_stats_update_begin(&bstats->syncp);
855 u64_stats_add(&bstats->bytes, bytes);
856 u64_stats_add(&bstats->packets, packets);
857 u64_stats_update_end(&bstats->syncp);
860 static inline void bstats_update(struct gnet_stats_basic_sync *bstats,
861 const struct sk_buff *skb)
863 _bstats_update(bstats,
865 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
868 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
869 const struct sk_buff *skb)
871 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb);
874 static inline void qdisc_bstats_update(struct Qdisc *sch,
875 const struct sk_buff *skb)
877 bstats_update(&sch->bstats, skb);
880 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
881 const struct sk_buff *skb)
883 sch->qstats.backlog -= qdisc_pkt_len(skb);
886 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
887 const struct sk_buff *skb)
889 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
892 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
893 const struct sk_buff *skb)
895 sch->qstats.backlog += qdisc_pkt_len(skb);
898 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
899 const struct sk_buff *skb)
901 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
904 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
906 this_cpu_inc(sch->cpu_qstats->qlen);
909 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
911 this_cpu_dec(sch->cpu_qstats->qlen);
914 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
916 this_cpu_inc(sch->cpu_qstats->requeues);
919 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
921 sch->qstats.drops += count;
924 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
929 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
931 qstats->overlimits++;
934 static inline void qdisc_qstats_drop(struct Qdisc *sch)
936 qstats_drop_inc(&sch->qstats);
939 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
941 this_cpu_inc(sch->cpu_qstats->drops);
944 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
946 sch->qstats.overlimits++;
949 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
951 __u32 qlen = qdisc_qlen_sum(sch);
953 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
956 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
959 struct gnet_stats_queue qstats = { 0 };
961 gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats);
962 *qlen = qstats.qlen + qdisc_qlen(sch);
963 *backlog = qstats.backlog;
966 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
970 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
971 qdisc_tree_reduce_backlog(sch, qlen, backlog);
974 static inline void qdisc_purge_queue(struct Qdisc *sch)
978 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
980 qdisc_tree_reduce_backlog(sch, qlen, backlog);
983 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
990 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
991 struct qdisc_skb_head *qh)
993 struct sk_buff *last = qh->tail;
1006 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
1008 __qdisc_enqueue_tail(skb, &sch->q);
1009 qdisc_qstats_backlog_inc(sch, skb);
1010 return NET_XMIT_SUCCESS;
1013 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
1014 struct qdisc_skb_head *qh)
1016 skb->next = qh->head;
1024 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
1026 struct sk_buff *skb = qh->head;
1028 if (likely(skb != NULL)) {
1029 qh->head = skb->next;
1031 if (qh->head == NULL)
1039 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1041 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1043 if (likely(skb != NULL)) {
1044 qdisc_qstats_backlog_dec(sch, skb);
1045 qdisc_bstats_update(sch, skb);
1051 /* Instead of calling kfree_skb() while root qdisc lock is held,
1052 * queue the skb for future freeing at end of __dev_xmit_skb()
1054 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1056 skb->next = *to_free;
1060 static inline void __qdisc_drop_all(struct sk_buff *skb,
1061 struct sk_buff **to_free)
1064 skb->prev->next = *to_free;
1066 skb->next = *to_free;
1070 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1071 struct qdisc_skb_head *qh,
1072 struct sk_buff **to_free)
1074 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1076 if (likely(skb != NULL)) {
1077 unsigned int len = qdisc_pkt_len(skb);
1079 qdisc_qstats_backlog_dec(sch, skb);
1080 __qdisc_drop(skb, to_free);
1087 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1089 const struct qdisc_skb_head *qh = &sch->q;
1094 /* generic pseudo peek method for non-work-conserving qdisc */
1095 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1097 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1099 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1101 skb = sch->dequeue(sch);
1104 __skb_queue_head(&sch->gso_skb, skb);
1105 /* it's still part of the queue */
1106 qdisc_qstats_backlog_inc(sch, skb);
1114 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1115 struct sk_buff *skb)
1117 if (qdisc_is_percpu_stats(sch)) {
1118 qdisc_qstats_cpu_backlog_dec(sch, skb);
1119 qdisc_bstats_cpu_update(sch, skb);
1120 qdisc_qstats_cpu_qlen_dec(sch);
1122 qdisc_qstats_backlog_dec(sch, skb);
1123 qdisc_bstats_update(sch, skb);
1128 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1129 unsigned int pkt_len)
1131 if (qdisc_is_percpu_stats(sch)) {
1132 qdisc_qstats_cpu_qlen_inc(sch);
1133 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1135 sch->qstats.backlog += pkt_len;
1140 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1141 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1143 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1146 skb = __skb_dequeue(&sch->gso_skb);
1147 if (qdisc_is_percpu_stats(sch)) {
1148 qdisc_qstats_cpu_backlog_dec(sch, skb);
1149 qdisc_qstats_cpu_qlen_dec(sch);
1151 qdisc_qstats_backlog_dec(sch, skb);
1155 skb = sch->dequeue(sch);
1161 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1164 * We do not know the backlog in bytes of this list, it
1165 * is up to the caller to correct it
1169 rtnl_kfree_skbs(qh->head, qh->tail);
1177 static inline void qdisc_reset_queue(struct Qdisc *sch)
1179 __qdisc_reset_queue(&sch->q);
1180 sch->qstats.backlog = 0;
1183 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1184 struct Qdisc **pold)
1192 qdisc_purge_queue(old);
1193 sch_tree_unlock(sch);
1198 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1200 rtnl_kfree_skbs(skb, skb);
1201 qdisc_qstats_drop(sch);
1204 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1205 struct sk_buff **to_free)
1207 __qdisc_drop(skb, to_free);
1208 qdisc_qstats_cpu_drop(sch);
1210 return NET_XMIT_DROP;
1213 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1214 struct sk_buff **to_free)
1216 __qdisc_drop(skb, to_free);
1217 qdisc_qstats_drop(sch);
1219 return NET_XMIT_DROP;
1222 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1223 struct sk_buff **to_free)
1225 __qdisc_drop_all(skb, to_free);
1226 qdisc_qstats_drop(sch);
1228 return NET_XMIT_DROP;
1231 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1232 long it will take to send a packet given its size.
1234 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1236 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1239 slot >>= rtab->rate.cell_log;
1241 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1242 return rtab->data[slot];
1245 struct psched_ratecfg {
1246 u64 rate_bytes_ps; /* bytes per second */
1253 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1258 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1259 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1261 return ((u64)len * r->mult) >> r->shift;
1264 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1265 const struct tc_ratespec *conf,
1268 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1269 const struct psched_ratecfg *r)
1271 memset(res, 0, sizeof(*res));
1273 /* legacy struct tc_ratespec has a 32bit @rate field
1274 * Qdisc using 64bit rate should add new attributes
1275 * in order to maintain compatibility.
1277 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1279 res->overhead = r->overhead;
1280 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1283 struct psched_pktrate {
1284 u64 rate_pkts_ps; /* packets per second */
1289 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r,
1290 unsigned int pkt_num)
1292 return ((u64)pkt_num * r->mult) >> r->shift;
1295 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64);
1297 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1298 * The fast path only needs to access filter list and to update stats
1301 struct tcf_proto *filter_list;
1302 struct tcf_block *block;
1303 struct gnet_stats_basic_sync __percpu *cpu_bstats;
1304 struct gnet_stats_queue __percpu *cpu_qstats;
1305 unsigned long rcu_state;
1308 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1309 const struct sk_buff *skb)
1311 bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1314 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1316 this_cpu_inc(miniq->cpu_qstats->drops);
1319 struct mini_Qdisc_pair {
1320 struct mini_Qdisc miniq1;
1321 struct mini_Qdisc miniq2;
1322 struct mini_Qdisc __rcu **p_miniq;
1325 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1326 struct tcf_proto *tp_head);
1327 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1328 struct mini_Qdisc __rcu **p_miniq);
1329 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1330 struct tcf_block *block);
1332 void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx);
1334 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));