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>
22 #include <linux/xarray.h>
30 struct qdisc_rate_table {
31 struct tc_ratespec rate;
33 struct qdisc_rate_table *next;
39 __QDISC_STATE_DEACTIVATED,
41 __QDISC_STATE_DRAINING,
45 /* Only for !TCQ_F_NOLOCK qdisc. Never access it directly.
46 * Use qdisc_run_begin/end() or qdisc_is_running() instead.
48 __QDISC_STATE2_RUNNING,
51 #define QDISC_STATE_MISSED BIT(__QDISC_STATE_MISSED)
52 #define QDISC_STATE_DRAINING BIT(__QDISC_STATE_DRAINING)
54 #define QDISC_STATE_NON_EMPTY (QDISC_STATE_MISSED | \
57 struct qdisc_size_table {
59 struct list_head list;
60 struct tc_sizespec szopts;
65 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
66 struct qdisc_skb_head {
74 int (*enqueue)(struct sk_buff *skb,
76 struct sk_buff **to_free);
77 struct sk_buff * (*dequeue)(struct Qdisc *sch);
79 #define TCQ_F_BUILTIN 1
80 #define TCQ_F_INGRESS 2
81 #define TCQ_F_CAN_BYPASS 4
82 #define TCQ_F_MQROOT 8
83 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
84 * q->dev_queue : It can test
85 * netif_xmit_frozen_or_stopped() before
86 * dequeueing next packet.
87 * Its true for MQ/MQPRIO slaves, or non
90 #define TCQ_F_WARN_NONWC (1 << 16)
91 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
92 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
93 * qdisc_tree_decrease_qlen() should stop.
95 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
96 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
97 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
99 const struct Qdisc_ops *ops;
100 struct qdisc_size_table __rcu *stab;
101 struct hlist_node hash;
105 struct netdev_queue *dev_queue;
107 struct net_rate_estimator __rcu *rate_est;
108 struct gnet_stats_basic_sync __percpu *cpu_bstats;
109 struct gnet_stats_queue __percpu *cpu_qstats;
114 * For performance sake on SMP, we put highly modified fields at the end
116 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
117 struct qdisc_skb_head q;
118 struct gnet_stats_basic_sync bstats;
119 struct gnet_stats_queue qstats;
122 unsigned long state2; /* must be written under qdisc spinlock */
123 struct Qdisc *next_sched;
124 struct sk_buff_head skb_bad_txq;
126 spinlock_t busylock ____cacheline_aligned_in_smp;
130 netdevice_tracker dev_tracker;
131 struct lock_class_key root_lock_key;
133 long privdata[] ____cacheline_aligned;
136 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
138 if (qdisc->flags & TCQ_F_BUILTIN)
140 refcount_inc(&qdisc->refcnt);
143 static inline bool qdisc_refcount_dec_if_one(struct Qdisc *qdisc)
145 if (qdisc->flags & TCQ_F_BUILTIN)
147 return refcount_dec_if_one(&qdisc->refcnt);
150 /* Intended to be used by unlocked users, when concurrent qdisc release is
154 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
156 if (qdisc->flags & TCQ_F_BUILTIN)
158 if (refcount_inc_not_zero(&qdisc->refcnt))
163 /* For !TCQ_F_NOLOCK qdisc: callers must either call this within a qdisc
164 * root_lock section, or provide their own memory barriers -- ordering
165 * against qdisc_run_begin/end() atomic bit operations.
167 static inline bool qdisc_is_running(struct Qdisc *qdisc)
169 if (qdisc->flags & TCQ_F_NOLOCK)
170 return spin_is_locked(&qdisc->seqlock);
171 return test_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
174 static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc)
176 return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY);
179 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
181 return q->flags & TCQ_F_CPUSTATS;
184 static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
186 if (qdisc_is_percpu_stats(qdisc))
187 return nolock_qdisc_is_empty(qdisc);
188 return !READ_ONCE(qdisc->q.qlen);
191 /* For !TCQ_F_NOLOCK qdisc, qdisc_run_begin/end() must be invoked with
192 * the qdisc root lock acquired.
194 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
196 if (qdisc->flags & TCQ_F_NOLOCK) {
197 if (spin_trylock(&qdisc->seqlock))
200 /* No need to insist if the MISSED flag was already set.
201 * Note that test_and_set_bit() also gives us memory ordering
202 * guarantees wrt potential earlier enqueue() and below
203 * spin_trylock(), both of which are necessary to prevent races
205 if (test_and_set_bit(__QDISC_STATE_MISSED, &qdisc->state))
208 /* Try to take the lock again to make sure that we will either
209 * grab it or the CPU that still has it will see MISSED set
210 * when testing it in qdisc_run_end()
212 return spin_trylock(&qdisc->seqlock);
214 return !__test_and_set_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
217 static inline void qdisc_run_end(struct Qdisc *qdisc)
219 if (qdisc->flags & TCQ_F_NOLOCK) {
220 spin_unlock(&qdisc->seqlock);
222 /* spin_unlock() only has store-release semantic. The unlock
223 * and test_bit() ordering is a store-load ordering, so a full
224 * memory barrier is needed here.
228 if (unlikely(test_bit(__QDISC_STATE_MISSED,
230 __netif_schedule(qdisc);
232 __clear_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
236 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
238 return qdisc->flags & TCQ_F_ONETXQUEUE;
241 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
243 return netdev_queue_dql_avail(txq);
246 struct Qdisc_class_ops {
248 /* Child qdisc manipulation */
249 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
250 int (*graft)(struct Qdisc *, unsigned long cl,
251 struct Qdisc *, struct Qdisc **,
252 struct netlink_ext_ack *extack);
253 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
254 void (*qlen_notify)(struct Qdisc *, unsigned long);
256 /* Class manipulation routines */
257 unsigned long (*find)(struct Qdisc *, u32 classid);
258 int (*change)(struct Qdisc *, u32, u32,
259 struct nlattr **, unsigned long *,
260 struct netlink_ext_ack *);
261 int (*delete)(struct Qdisc *, unsigned long,
262 struct netlink_ext_ack *);
263 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
265 /* Filter manipulation */
266 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
268 struct netlink_ext_ack *extack);
269 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
271 void (*unbind_tcf)(struct Qdisc *, unsigned long);
273 /* rtnetlink specific */
274 int (*dump)(struct Qdisc *, unsigned long,
275 struct sk_buff *skb, struct tcmsg*);
276 int (*dump_stats)(struct Qdisc *, unsigned long,
280 /* Qdisc_class_ops flag values */
282 /* Implements API that doesn't require rtnl lock */
283 enum qdisc_class_ops_flags {
284 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
288 struct Qdisc_ops *next;
289 const struct Qdisc_class_ops *cl_ops;
292 unsigned int static_flags;
294 int (*enqueue)(struct sk_buff *skb,
296 struct sk_buff **to_free);
297 struct sk_buff * (*dequeue)(struct Qdisc *);
298 struct sk_buff * (*peek)(struct Qdisc *);
300 int (*init)(struct Qdisc *sch, struct nlattr *arg,
301 struct netlink_ext_ack *extack);
302 void (*reset)(struct Qdisc *);
303 void (*destroy)(struct Qdisc *);
304 int (*change)(struct Qdisc *sch,
306 struct netlink_ext_ack *extack);
307 void (*attach)(struct Qdisc *sch);
308 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
309 void (*change_real_num_tx)(struct Qdisc *sch,
310 unsigned int new_real_tx);
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;
331 const struct tcf_proto *goto_tp;
337 struct tcf_proto_ops {
338 struct list_head head;
341 int (*classify)(struct sk_buff *,
342 const struct tcf_proto *,
343 struct tcf_result *);
344 int (*init)(struct tcf_proto*);
345 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
346 struct netlink_ext_ack *extack);
348 void* (*get)(struct tcf_proto*, u32 handle);
349 void (*put)(struct tcf_proto *tp, void *f);
350 int (*change)(struct net *net, struct sk_buff *,
351 struct tcf_proto*, unsigned long,
352 u32 handle, struct nlattr **,
354 struct netlink_ext_ack *);
355 int (*delete)(struct tcf_proto *tp, void *arg,
356 bool *last, bool rtnl_held,
357 struct netlink_ext_ack *);
358 bool (*delete_empty)(struct tcf_proto *tp);
359 void (*walk)(struct tcf_proto *tp,
360 struct tcf_walker *arg, bool rtnl_held);
361 int (*reoffload)(struct tcf_proto *tp, bool add,
362 flow_setup_cb_t *cb, void *cb_priv,
363 struct netlink_ext_ack *extack);
364 void (*hw_add)(struct tcf_proto *tp,
366 void (*hw_del)(struct tcf_proto *tp,
368 void (*bind_class)(void *, u32, unsigned long,
369 void *, unsigned long);
370 void * (*tmplt_create)(struct net *net,
371 struct tcf_chain *chain,
373 struct netlink_ext_ack *extack);
374 void (*tmplt_destroy)(void *tmplt_priv);
375 void (*tmplt_reoffload)(struct tcf_chain *chain,
379 struct tcf_exts * (*get_exts)(const struct tcf_proto *tp,
382 /* rtnetlink specific */
383 int (*dump)(struct net*, struct tcf_proto*, void *,
384 struct sk_buff *skb, struct tcmsg*,
386 int (*terse_dump)(struct net *net,
387 struct tcf_proto *tp, void *fh,
389 struct tcmsg *t, bool rtnl_held);
390 int (*tmplt_dump)(struct sk_buff *skb,
394 struct module *owner;
398 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
399 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
400 * conditions can occur when filters are inserted/deleted simultaneously.
402 enum tcf_proto_ops_flags {
403 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
407 /* Fast access part */
408 struct tcf_proto __rcu *next;
411 /* called under RCU BH lock*/
412 int (*classify)(struct sk_buff *,
413 const struct tcf_proto *,
414 struct tcf_result *);
420 const struct tcf_proto_ops *ops;
421 struct tcf_chain *chain;
422 /* Lock protects tcf_proto shared state and can be used by unlocked
423 * classifiers to protect their private data.
431 struct hlist_node destroy_ht_node;
434 struct qdisc_skb_cb {
436 unsigned int pkt_len;
437 u16 slave_dev_queue_mapping;
440 #define QDISC_CB_PRIV_LEN 20
441 unsigned char data[QDISC_CB_PRIV_LEN];
444 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
447 /* Protects filter_chain. */
448 struct mutex filter_chain_lock;
449 struct tcf_proto __rcu *filter_chain;
450 struct list_head list;
451 struct tcf_block *block;
452 u32 index; /* chain index */
454 unsigned int action_refcnt;
455 bool explicitly_created;
457 const struct tcf_proto_ops *tmplt_ops;
463 struct xarray ports; /* datapath accessible */
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;
479 atomic_t offloadcnt; /* Number of oddloaded filters */
480 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
481 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
483 struct tcf_chain *chain;
484 struct list_head filter_chain_list;
487 DECLARE_HASHTABLE(proto_destroy_ht, 7);
488 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
491 struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index);
493 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
495 return lockdep_is_held(&chain->filter_chain_lock);
498 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
500 return lockdep_is_held(&tp->lock);
503 #define tcf_chain_dereference(p, chain) \
504 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
506 #define tcf_proto_dereference(p, tp) \
507 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
509 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
511 struct qdisc_skb_cb *qcb;
513 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb));
514 BUILD_BUG_ON(sizeof(qcb->data) < sz);
517 static inline int qdisc_qlen(const struct Qdisc *q)
522 static inline int qdisc_qlen_sum(const struct Qdisc *q)
524 __u32 qlen = q->qstats.qlen;
527 if (qdisc_is_percpu_stats(q)) {
528 for_each_possible_cpu(i)
529 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
537 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
539 return (struct qdisc_skb_cb *)skb->cb;
542 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
544 return &qdisc->q.lock;
547 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
549 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
554 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
556 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
559 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
561 return rcu_dereference_rtnl(qdisc->dev_queue->qdisc_sleeping);
564 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
566 struct Qdisc *root = qdisc_root_sleeping(qdisc);
569 return qdisc_lock(root);
572 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
574 return qdisc->dev_queue->dev;
577 static inline void sch_tree_lock(struct Qdisc *q)
579 if (q->flags & TCQ_F_MQROOT)
580 spin_lock_bh(qdisc_lock(q));
582 spin_lock_bh(qdisc_root_sleeping_lock(q));
585 static inline void sch_tree_unlock(struct Qdisc *q)
587 if (q->flags & TCQ_F_MQROOT)
588 spin_unlock_bh(qdisc_lock(q));
590 spin_unlock_bh(qdisc_root_sleeping_lock(q));
593 extern struct Qdisc noop_qdisc;
594 extern struct Qdisc_ops noop_qdisc_ops;
595 extern struct Qdisc_ops pfifo_fast_ops;
596 extern const u8 sch_default_prio2band[TC_PRIO_MAX + 1];
597 extern struct Qdisc_ops mq_qdisc_ops;
598 extern struct Qdisc_ops noqueue_qdisc_ops;
599 extern const struct Qdisc_ops *default_qdisc_ops;
600 static inline const struct Qdisc_ops *
601 get_default_qdisc_ops(const struct net_device *dev, int ntx)
603 return ntx < dev->real_num_tx_queues ?
604 default_qdisc_ops : &pfifo_fast_ops;
607 struct Qdisc_class_common {
609 unsigned int filter_cnt;
610 struct hlist_node hnode;
613 struct Qdisc_class_hash {
614 struct hlist_head *hash;
615 unsigned int hashsize;
616 unsigned int hashmask;
617 unsigned int hashelems;
620 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
627 static inline struct Qdisc_class_common *
628 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
630 struct Qdisc_class_common *cl;
636 h = qdisc_class_hash(id, hash->hashmask);
637 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
638 if (cl->classid == id)
644 static inline bool qdisc_class_in_use(const struct Qdisc_class_common *cl)
646 return cl->filter_cnt > 0;
649 static inline void qdisc_class_get(struct Qdisc_class_common *cl)
653 if (check_add_overflow(cl->filter_cnt, 1, &res))
654 WARN(1, "Qdisc class overflow");
656 cl->filter_cnt = res;
659 static inline void qdisc_class_put(struct Qdisc_class_common *cl)
663 if (check_sub_overflow(cl->filter_cnt, 1, &res))
664 WARN(1, "Qdisc class underflow");
666 cl->filter_cnt = res;
669 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
671 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
673 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
676 int qdisc_class_hash_init(struct Qdisc_class_hash *);
677 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
678 struct Qdisc_class_common *);
679 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
680 struct Qdisc_class_common *);
681 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
682 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
684 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
685 void dev_qdisc_change_real_num_tx(struct net_device *dev,
686 unsigned int new_real_tx);
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_destroy(struct Qdisc *qdisc);
696 void qdisc_put(struct Qdisc *qdisc);
697 void qdisc_put_unlocked(struct Qdisc *qdisc);
698 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
699 #ifdef CONFIG_NET_SCHED
700 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
702 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
703 struct Qdisc *new, struct Qdisc *old,
704 enum tc_setup_type type, void *type_data,
705 struct netlink_ext_ack *extack);
708 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
711 q->flags &= ~TCQ_F_OFFLOADED;
716 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
717 struct Qdisc *new, struct Qdisc *old,
718 enum tc_setup_type type, void *type_data,
719 struct netlink_ext_ack *extack)
723 void qdisc_offload_query_caps(struct net_device *dev,
724 enum tc_setup_type type,
725 void *caps, size_t caps_len);
726 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
727 const struct Qdisc_ops *ops,
728 struct netlink_ext_ack *extack);
729 void qdisc_free(struct Qdisc *qdisc);
730 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
731 const struct Qdisc_ops *ops, u32 parentid,
732 struct netlink_ext_ack *extack);
733 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
734 const struct qdisc_size_table *stab);
735 int skb_do_redirect(struct sk_buff *);
737 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
739 #ifdef CONFIG_NET_XGRESS
740 return skb->tc_at_ingress;
746 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
748 #ifdef CONFIG_NET_CLS_ACT
749 if (skb->tc_skip_classify) {
750 skb->tc_skip_classify = 0;
757 /* Reset all TX qdiscs greater than index of a device. */
758 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
762 for (; i < dev->num_tx_queues; i++) {
763 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
765 spin_lock_bh(qdisc_lock(qdisc));
767 spin_unlock_bh(qdisc_lock(qdisc));
772 /* Are all TX queues of the device empty? */
773 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
778 for (i = 0; i < dev->num_tx_queues; i++) {
779 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
780 const struct Qdisc *q = rcu_dereference(txq->qdisc);
782 if (!qdisc_is_empty(q)) {
791 /* Are any of the TX qdiscs changing? */
792 static inline bool qdisc_tx_changing(const struct net_device *dev)
796 for (i = 0; i < dev->num_tx_queues; i++) {
797 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
799 if (rcu_access_pointer(txq->qdisc) !=
800 rcu_access_pointer(txq->qdisc_sleeping))
806 /* "noqueue" qdisc identified by not having any enqueue, see noqueue_init() */
807 static inline bool qdisc_txq_has_no_queue(const struct netdev_queue *txq)
809 struct Qdisc *qdisc = rcu_access_pointer(txq->qdisc);
811 return qdisc->enqueue == NULL;
814 /* Is the device using the noop qdisc on all queues? */
815 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
819 for (i = 0; i < dev->num_tx_queues; i++) {
820 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
821 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
827 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
829 return qdisc_skb_cb(skb)->pkt_len;
832 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
833 enum net_xmit_qdisc_t {
834 __NET_XMIT_STOLEN = 0x00010000,
835 __NET_XMIT_BYPASS = 0x00020000,
838 #ifdef CONFIG_NET_CLS_ACT
839 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
841 #define net_xmit_drop_count(e) (1)
844 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
845 const struct Qdisc *sch)
847 #ifdef CONFIG_NET_SCHED
848 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
851 __qdisc_calculate_pkt_len(skb, stab);
855 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
856 struct sk_buff **to_free)
858 return sch->enqueue(skb, sch, to_free);
861 static inline void _bstats_update(struct gnet_stats_basic_sync *bstats,
862 __u64 bytes, __u64 packets)
864 u64_stats_update_begin(&bstats->syncp);
865 u64_stats_add(&bstats->bytes, bytes);
866 u64_stats_add(&bstats->packets, packets);
867 u64_stats_update_end(&bstats->syncp);
870 static inline void bstats_update(struct gnet_stats_basic_sync *bstats,
871 const struct sk_buff *skb)
873 _bstats_update(bstats,
875 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
878 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
879 const struct sk_buff *skb)
881 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb);
884 static inline void qdisc_bstats_update(struct Qdisc *sch,
885 const struct sk_buff *skb)
887 bstats_update(&sch->bstats, skb);
890 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
891 const struct sk_buff *skb)
893 sch->qstats.backlog -= qdisc_pkt_len(skb);
896 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
897 const struct sk_buff *skb)
899 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
902 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
903 const struct sk_buff *skb)
905 sch->qstats.backlog += qdisc_pkt_len(skb);
908 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
909 const struct sk_buff *skb)
911 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
914 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
916 this_cpu_inc(sch->cpu_qstats->qlen);
919 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
921 this_cpu_dec(sch->cpu_qstats->qlen);
924 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
926 this_cpu_inc(sch->cpu_qstats->requeues);
929 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
931 sch->qstats.drops += count;
934 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
939 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
941 qstats->overlimits++;
944 static inline void qdisc_qstats_drop(struct Qdisc *sch)
946 qstats_drop_inc(&sch->qstats);
949 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
951 this_cpu_inc(sch->cpu_qstats->drops);
954 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
956 sch->qstats.overlimits++;
959 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
961 __u32 qlen = qdisc_qlen_sum(sch);
963 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
966 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
969 struct gnet_stats_queue qstats = { 0 };
971 gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats);
972 *qlen = qstats.qlen + qdisc_qlen(sch);
973 *backlog = qstats.backlog;
976 static inline void qdisc_purge_queue(struct Qdisc *sch)
980 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
982 qdisc_tree_reduce_backlog(sch, qlen, backlog);
985 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
986 struct qdisc_skb_head *qh)
988 struct sk_buff *last = qh->tail;
1001 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
1003 __qdisc_enqueue_tail(skb, &sch->q);
1004 qdisc_qstats_backlog_inc(sch, skb);
1005 return NET_XMIT_SUCCESS;
1008 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
1009 struct qdisc_skb_head *qh)
1011 skb->next = qh->head;
1019 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
1021 struct sk_buff *skb = qh->head;
1023 if (likely(skb != NULL)) {
1024 qh->head = skb->next;
1026 if (qh->head == NULL)
1034 static inline struct sk_buff *qdisc_dequeue_internal(struct Qdisc *sch, bool direct)
1036 struct sk_buff *skb;
1038 skb = __skb_dequeue(&sch->gso_skb);
1044 return __qdisc_dequeue_head(&sch->q);
1046 return sch->dequeue(sch);
1049 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1051 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1053 if (likely(skb != NULL)) {
1054 qdisc_qstats_backlog_dec(sch, skb);
1055 qdisc_bstats_update(sch, skb);
1062 struct qdisc_skb_cb qdisc_cb;
1065 u16 zone; /* Only valid if post_ct = true */
1072 static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb)
1074 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb;
1076 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb));
1080 static inline enum skb_drop_reason
1081 tcf_get_drop_reason(const struct sk_buff *skb)
1083 return tc_skb_cb(skb)->drop_reason;
1086 static inline void tcf_set_drop_reason(const struct sk_buff *skb,
1087 enum skb_drop_reason reason)
1089 tc_skb_cb(skb)->drop_reason = reason;
1092 /* Instead of calling kfree_skb() while root qdisc lock is held,
1093 * queue the skb for future freeing at end of __dev_xmit_skb()
1095 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1097 skb->next = *to_free;
1101 static inline void __qdisc_drop_all(struct sk_buff *skb,
1102 struct sk_buff **to_free)
1105 skb->prev->next = *to_free;
1107 skb->next = *to_free;
1111 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1112 struct qdisc_skb_head *qh,
1113 struct sk_buff **to_free)
1115 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1117 if (likely(skb != NULL)) {
1118 unsigned int len = qdisc_pkt_len(skb);
1120 qdisc_qstats_backlog_dec(sch, skb);
1121 __qdisc_drop(skb, to_free);
1128 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1130 const struct qdisc_skb_head *qh = &sch->q;
1135 /* generic pseudo peek method for non-work-conserving qdisc */
1136 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1138 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1140 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1142 skb = sch->dequeue(sch);
1145 __skb_queue_head(&sch->gso_skb, skb);
1146 /* it's still part of the queue */
1147 qdisc_qstats_backlog_inc(sch, skb);
1155 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1156 struct sk_buff *skb)
1158 if (qdisc_is_percpu_stats(sch)) {
1159 qdisc_qstats_cpu_backlog_dec(sch, skb);
1160 qdisc_bstats_cpu_update(sch, skb);
1161 qdisc_qstats_cpu_qlen_dec(sch);
1163 qdisc_qstats_backlog_dec(sch, skb);
1164 qdisc_bstats_update(sch, skb);
1169 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1170 unsigned int pkt_len)
1172 if (qdisc_is_percpu_stats(sch)) {
1173 qdisc_qstats_cpu_qlen_inc(sch);
1174 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1176 sch->qstats.backlog += pkt_len;
1181 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1182 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1184 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1187 skb = __skb_dequeue(&sch->gso_skb);
1188 if (qdisc_is_percpu_stats(sch)) {
1189 qdisc_qstats_cpu_backlog_dec(sch, skb);
1190 qdisc_qstats_cpu_qlen_dec(sch);
1192 qdisc_qstats_backlog_dec(sch, skb);
1196 skb = sch->dequeue(sch);
1202 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1205 * We do not know the backlog in bytes of this list, it
1206 * is up to the caller to correct it
1210 rtnl_kfree_skbs(qh->head, qh->tail);
1218 static inline void qdisc_reset_queue(struct Qdisc *sch)
1220 __qdisc_reset_queue(&sch->q);
1223 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1224 struct Qdisc **pold)
1232 qdisc_purge_queue(old);
1233 sch_tree_unlock(sch);
1238 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1240 rtnl_kfree_skbs(skb, skb);
1241 qdisc_qstats_drop(sch);
1244 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1245 struct sk_buff **to_free)
1247 __qdisc_drop(skb, to_free);
1248 qdisc_qstats_cpu_drop(sch);
1250 return NET_XMIT_DROP;
1253 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1254 struct sk_buff **to_free)
1256 __qdisc_drop(skb, to_free);
1257 qdisc_qstats_drop(sch);
1259 return NET_XMIT_DROP;
1262 static inline int qdisc_drop_reason(struct sk_buff *skb, struct Qdisc *sch,
1263 struct sk_buff **to_free,
1264 enum skb_drop_reason reason)
1266 tcf_set_drop_reason(skb, reason);
1267 return qdisc_drop(skb, sch, to_free);
1270 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1271 struct sk_buff **to_free)
1273 __qdisc_drop_all(skb, to_free);
1274 qdisc_qstats_drop(sch);
1276 return NET_XMIT_DROP;
1279 struct psched_ratecfg {
1280 u64 rate_bytes_ps; /* bytes per second */
1288 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1296 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1297 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1299 return ((u64)len * r->mult) >> r->shift;
1302 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1303 const struct tc_ratespec *conf,
1306 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1307 const struct psched_ratecfg *r)
1309 memset(res, 0, sizeof(*res));
1311 /* legacy struct tc_ratespec has a 32bit @rate field
1312 * Qdisc using 64bit rate should add new attributes
1313 * in order to maintain compatibility.
1315 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1317 res->overhead = r->overhead;
1319 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1322 struct psched_pktrate {
1323 u64 rate_pkts_ps; /* packets per second */
1328 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r,
1329 unsigned int pkt_num)
1331 return ((u64)pkt_num * r->mult) >> r->shift;
1334 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64);
1336 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1337 * The fast path only needs to access filter list and to update stats
1340 struct tcf_proto *filter_list;
1341 struct tcf_block *block;
1342 struct gnet_stats_basic_sync __percpu *cpu_bstats;
1343 struct gnet_stats_queue __percpu *cpu_qstats;
1344 unsigned long rcu_state;
1347 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1348 const struct sk_buff *skb)
1350 bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1353 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1355 this_cpu_inc(miniq->cpu_qstats->drops);
1358 struct mini_Qdisc_pair {
1359 struct mini_Qdisc miniq1;
1360 struct mini_Qdisc miniq2;
1361 struct mini_Qdisc __rcu **p_miniq;
1364 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1365 struct tcf_proto *tp_head);
1366 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1367 struct mini_Qdisc __rcu **p_miniq);
1368 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1369 struct tcf_block *block);
1371 void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx);
1373 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));
1375 /* Make sure qdisc is no longer in SCHED state. */
1376 static inline void qdisc_synchronize(const struct Qdisc *q)
1378 while (test_bit(__QDISC_STATE_SCHED, &q->state))