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 <net/gen_stats.h>
17 #include <net/rtnetlink.h>
25 typedef int tc_setup_cb_t(enum tc_setup_type type,
26 void *type_data, void *cb_priv);
28 typedef int tc_indr_block_bind_cb_t(struct net_device *dev, void *cb_priv,
29 enum tc_setup_type type, void *type_data);
31 struct qdisc_rate_table {
32 struct tc_ratespec rate;
34 struct qdisc_rate_table *next;
40 __QDISC_STATE_DEACTIVATED,
43 struct qdisc_size_table {
45 struct list_head list;
46 struct tc_sizespec szopts;
51 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
52 struct qdisc_skb_head {
60 int (*enqueue)(struct sk_buff *skb,
62 struct sk_buff **to_free);
63 struct sk_buff * (*dequeue)(struct Qdisc *sch);
65 #define TCQ_F_BUILTIN 1
66 #define TCQ_F_INGRESS 2
67 #define TCQ_F_CAN_BYPASS 4
68 #define TCQ_F_MQROOT 8
69 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
70 * q->dev_queue : It can test
71 * netif_xmit_frozen_or_stopped() before
72 * dequeueing next packet.
73 * Its true for MQ/MQPRIO slaves, or non
76 #define TCQ_F_WARN_NONWC (1 << 16)
77 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
78 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
79 * qdisc_tree_decrease_qlen() should stop.
81 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
82 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */
83 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
85 const struct Qdisc_ops *ops;
86 struct qdisc_size_table __rcu *stab;
87 struct hlist_node hash;
91 struct netdev_queue *dev_queue;
93 struct net_rate_estimator __rcu *rate_est;
94 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
95 struct gnet_stats_queue __percpu *cpu_qstats;
100 * For performance sake on SMP, we put highly modified fields at the end
102 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
103 struct qdisc_skb_head q;
104 struct gnet_stats_basic_packed bstats;
106 struct gnet_stats_queue qstats;
108 struct Qdisc *next_sched;
109 struct sk_buff_head skb_bad_txq;
111 spinlock_t busylock ____cacheline_aligned_in_smp;
114 /* for NOLOCK qdisc, true if there are no enqueued skbs */
119 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
121 if (qdisc->flags & TCQ_F_BUILTIN)
123 refcount_inc(&qdisc->refcnt);
126 /* Intended to be used by unlocked users, when concurrent qdisc release is
130 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
132 if (qdisc->flags & TCQ_F_BUILTIN)
134 if (refcount_inc_not_zero(&qdisc->refcnt))
139 static inline bool qdisc_is_running(struct Qdisc *qdisc)
141 if (qdisc->flags & TCQ_F_NOLOCK)
142 return spin_is_locked(&qdisc->seqlock);
143 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
146 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
148 return q->flags & TCQ_F_CPUSTATS;
151 static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
153 if (qdisc_is_percpu_stats(qdisc))
155 return !qdisc->q.qlen;
158 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
160 if (qdisc->flags & TCQ_F_NOLOCK) {
161 if (!spin_trylock(&qdisc->seqlock))
163 qdisc->empty = false;
164 } else if (qdisc_is_running(qdisc)) {
167 /* Variant of write_seqcount_begin() telling lockdep a trylock
170 raw_write_seqcount_begin(&qdisc->running);
171 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
175 static inline void qdisc_run_end(struct Qdisc *qdisc)
177 write_seqcount_end(&qdisc->running);
178 if (qdisc->flags & TCQ_F_NOLOCK)
179 spin_unlock(&qdisc->seqlock);
182 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
184 return qdisc->flags & TCQ_F_ONETXQUEUE;
187 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
190 /* Non-BQL migrated drivers will return 0, too. */
191 return dql_avail(&txq->dql);
197 struct Qdisc_class_ops {
199 /* Child qdisc manipulation */
200 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
201 int (*graft)(struct Qdisc *, unsigned long cl,
202 struct Qdisc *, struct Qdisc **,
203 struct netlink_ext_ack *extack);
204 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
205 void (*qlen_notify)(struct Qdisc *, unsigned long);
207 /* Class manipulation routines */
208 unsigned long (*find)(struct Qdisc *, u32 classid);
209 int (*change)(struct Qdisc *, u32, u32,
210 struct nlattr **, unsigned long *,
211 struct netlink_ext_ack *);
212 int (*delete)(struct Qdisc *, unsigned long);
213 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
215 /* Filter manipulation */
216 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
218 struct netlink_ext_ack *extack);
219 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
221 void (*unbind_tcf)(struct Qdisc *, unsigned long);
223 /* rtnetlink specific */
224 int (*dump)(struct Qdisc *, unsigned long,
225 struct sk_buff *skb, struct tcmsg*);
226 int (*dump_stats)(struct Qdisc *, unsigned long,
230 /* Qdisc_class_ops flag values */
232 /* Implements API that doesn't require rtnl lock */
233 enum qdisc_class_ops_flags {
234 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
238 struct Qdisc_ops *next;
239 const struct Qdisc_class_ops *cl_ops;
242 unsigned int static_flags;
244 int (*enqueue)(struct sk_buff *skb,
246 struct sk_buff **to_free);
247 struct sk_buff * (*dequeue)(struct Qdisc *);
248 struct sk_buff * (*peek)(struct Qdisc *);
250 int (*init)(struct Qdisc *sch, struct nlattr *arg,
251 struct netlink_ext_ack *extack);
252 void (*reset)(struct Qdisc *);
253 void (*destroy)(struct Qdisc *);
254 int (*change)(struct Qdisc *sch,
256 struct netlink_ext_ack *extack);
257 void (*attach)(struct Qdisc *sch);
258 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
260 int (*dump)(struct Qdisc *, struct sk_buff *);
261 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
263 void (*ingress_block_set)(struct Qdisc *sch,
265 void (*egress_block_set)(struct Qdisc *sch,
267 u32 (*ingress_block_get)(struct Qdisc *sch);
268 u32 (*egress_block_get)(struct Qdisc *sch);
270 struct module *owner;
280 const struct tcf_proto *goto_tp;
282 /* used in the skb_tc_reinsert function */
285 struct gnet_stats_queue *qstats;
292 struct tcf_proto_ops {
293 struct list_head head;
296 int (*classify)(struct sk_buff *,
297 const struct tcf_proto *,
298 struct tcf_result *);
299 int (*init)(struct tcf_proto*);
300 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
301 struct netlink_ext_ack *extack);
303 void* (*get)(struct tcf_proto*, u32 handle);
304 void (*put)(struct tcf_proto *tp, void *f);
305 int (*change)(struct net *net, struct sk_buff *,
306 struct tcf_proto*, unsigned long,
307 u32 handle, struct nlattr **,
309 struct netlink_ext_ack *);
310 int (*delete)(struct tcf_proto *tp, void *arg,
311 bool *last, bool rtnl_held,
312 struct netlink_ext_ack *);
313 void (*walk)(struct tcf_proto *tp,
314 struct tcf_walker *arg, bool rtnl_held);
315 int (*reoffload)(struct tcf_proto *tp, bool add,
316 tc_setup_cb_t *cb, void *cb_priv,
317 struct netlink_ext_ack *extack);
318 void (*bind_class)(void *, u32, unsigned long);
319 void * (*tmplt_create)(struct net *net,
320 struct tcf_chain *chain,
322 struct netlink_ext_ack *extack);
323 void (*tmplt_destroy)(void *tmplt_priv);
325 /* rtnetlink specific */
326 int (*dump)(struct net*, struct tcf_proto*, void *,
327 struct sk_buff *skb, struct tcmsg*,
329 int (*tmplt_dump)(struct sk_buff *skb,
333 struct module *owner;
337 enum tcf_proto_ops_flags {
338 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
342 /* Fast access part */
343 struct tcf_proto __rcu *next;
346 /* called under RCU BH lock*/
347 int (*classify)(struct sk_buff *,
348 const struct tcf_proto *,
349 struct tcf_result *);
355 const struct tcf_proto_ops *ops;
356 struct tcf_chain *chain;
357 /* Lock protects tcf_proto shared state and can be used by unlocked
358 * classifiers to protect their private data.
366 struct qdisc_skb_cb {
368 unsigned int pkt_len;
369 u16 slave_dev_queue_mapping;
372 #define QDISC_CB_PRIV_LEN 20
373 unsigned char data[QDISC_CB_PRIV_LEN];
376 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
379 /* Protects filter_chain. */
380 struct mutex filter_chain_lock;
381 struct tcf_proto __rcu *filter_chain;
382 struct list_head list;
383 struct tcf_block *block;
384 u32 index; /* chain index */
386 unsigned int action_refcnt;
387 bool explicitly_created;
389 const struct tcf_proto_ops *tmplt_ops;
395 /* Lock protects tcf_block and lifetime-management data of chains
396 * attached to the block (refcnt, action_refcnt, explicitly_created).
399 struct list_head chain_list;
400 u32 index; /* block index for shared blocks */
404 struct list_head cb_list;
405 struct list_head owner_list;
407 unsigned int offloadcnt; /* Number of oddloaded filters */
408 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
410 struct tcf_chain *chain;
411 struct list_head filter_chain_list;
416 #ifdef CONFIG_PROVE_LOCKING
417 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
419 return lockdep_is_held(&chain->filter_chain_lock);
422 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
424 return lockdep_is_held(&tp->lock);
427 static inline bool lockdep_tcf_chain_is_locked(struct tcf_block *chain)
432 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
436 #endif /* #ifdef CONFIG_PROVE_LOCKING */
438 #define tcf_chain_dereference(p, chain) \
439 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
441 #define tcf_proto_dereference(p, tp) \
442 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
444 static inline void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
446 if (*flags & TCA_CLS_FLAGS_IN_HW)
448 *flags |= TCA_CLS_FLAGS_IN_HW;
452 static inline void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
454 if (!(*flags & TCA_CLS_FLAGS_IN_HW))
456 *flags &= ~TCA_CLS_FLAGS_IN_HW;
461 tc_cls_offload_cnt_update(struct tcf_block *block, u32 *cnt,
462 u32 *flags, bool add)
466 tcf_block_offload_inc(block, flags);
471 tcf_block_offload_dec(block, flags);
475 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
477 struct qdisc_skb_cb *qcb;
479 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
480 BUILD_BUG_ON(sizeof(qcb->data) < sz);
483 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
485 return this_cpu_ptr(q->cpu_qstats)->qlen;
488 static inline int qdisc_qlen(const struct Qdisc *q)
493 static inline int qdisc_qlen_sum(const struct Qdisc *q)
495 __u32 qlen = q->qstats.qlen;
498 if (qdisc_is_percpu_stats(q)) {
499 for_each_possible_cpu(i)
500 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
508 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
510 return (struct qdisc_skb_cb *)skb->cb;
513 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
515 return &qdisc->q.lock;
518 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
520 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
525 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
527 return qdisc->dev_queue->qdisc_sleeping;
530 /* The qdisc root lock is a mechanism by which to top level
531 * of a qdisc tree can be locked from any qdisc node in the
532 * forest. This allows changing the configuration of some
533 * aspect of the qdisc tree while blocking out asynchronous
534 * qdisc access in the packet processing paths.
536 * It is only legal to do this when the root will not change
537 * on us. Otherwise we'll potentially lock the wrong qdisc
538 * root. This is enforced by holding the RTNL semaphore, which
539 * all users of this lock accessor must do.
541 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
543 struct Qdisc *root = qdisc_root(qdisc);
546 return qdisc_lock(root);
549 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
551 struct Qdisc *root = qdisc_root_sleeping(qdisc);
554 return qdisc_lock(root);
557 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
559 struct Qdisc *root = qdisc_root_sleeping(qdisc);
562 return &root->running;
565 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
567 return qdisc->dev_queue->dev;
570 static inline void sch_tree_lock(const struct Qdisc *q)
572 spin_lock_bh(qdisc_root_sleeping_lock(q));
575 static inline void sch_tree_unlock(const struct Qdisc *q)
577 spin_unlock_bh(qdisc_root_sleeping_lock(q));
580 extern struct Qdisc noop_qdisc;
581 extern struct Qdisc_ops noop_qdisc_ops;
582 extern struct Qdisc_ops pfifo_fast_ops;
583 extern struct Qdisc_ops mq_qdisc_ops;
584 extern struct Qdisc_ops noqueue_qdisc_ops;
585 extern const struct Qdisc_ops *default_qdisc_ops;
586 static inline const struct Qdisc_ops *
587 get_default_qdisc_ops(const struct net_device *dev, int ntx)
589 return ntx < dev->real_num_tx_queues ?
590 default_qdisc_ops : &pfifo_fast_ops;
593 struct Qdisc_class_common {
595 struct hlist_node hnode;
598 struct Qdisc_class_hash {
599 struct hlist_head *hash;
600 unsigned int hashsize;
601 unsigned int hashmask;
602 unsigned int hashelems;
605 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
612 static inline struct Qdisc_class_common *
613 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
615 struct Qdisc_class_common *cl;
621 h = qdisc_class_hash(id, hash->hashmask);
622 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
623 if (cl->classid == id)
629 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
631 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
633 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
636 int qdisc_class_hash_init(struct Qdisc_class_hash *);
637 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
638 struct Qdisc_class_common *);
639 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
640 struct Qdisc_class_common *);
641 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
642 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
644 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
645 void dev_init_scheduler(struct net_device *dev);
646 void dev_shutdown(struct net_device *dev);
647 void dev_activate(struct net_device *dev);
648 void dev_deactivate(struct net_device *dev);
649 void dev_deactivate_many(struct list_head *head);
650 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
651 struct Qdisc *qdisc);
652 void qdisc_reset(struct Qdisc *qdisc);
653 void qdisc_put(struct Qdisc *qdisc);
654 void qdisc_put_unlocked(struct Qdisc *qdisc);
655 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
656 #ifdef CONFIG_NET_SCHED
657 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
659 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
660 struct Qdisc *new, struct Qdisc *old,
661 enum tc_setup_type type, void *type_data,
662 struct netlink_ext_ack *extack);
665 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
668 q->flags &= ~TCQ_F_OFFLOADED;
673 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
674 struct Qdisc *new, struct Qdisc *old,
675 enum tc_setup_type type, void *type_data,
676 struct netlink_ext_ack *extack)
680 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
681 const struct Qdisc_ops *ops,
682 struct netlink_ext_ack *extack);
683 void qdisc_free(struct Qdisc *qdisc);
684 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
685 const struct Qdisc_ops *ops, u32 parentid,
686 struct netlink_ext_ack *extack);
687 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
688 const struct qdisc_size_table *stab);
689 int skb_do_redirect(struct sk_buff *);
691 static inline void skb_reset_tc(struct sk_buff *skb)
693 #ifdef CONFIG_NET_CLS_ACT
694 skb->tc_redirected = 0;
698 static inline bool skb_is_tc_redirected(const struct sk_buff *skb)
700 #ifdef CONFIG_NET_CLS_ACT
701 return skb->tc_redirected;
707 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
709 #ifdef CONFIG_NET_CLS_ACT
710 return skb->tc_at_ingress;
716 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
718 #ifdef CONFIG_NET_CLS_ACT
719 if (skb->tc_skip_classify) {
720 skb->tc_skip_classify = 0;
727 /* Reset all TX qdiscs greater than index of a device. */
728 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
732 for (; i < dev->num_tx_queues; i++) {
733 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
735 spin_lock_bh(qdisc_lock(qdisc));
737 spin_unlock_bh(qdisc_lock(qdisc));
742 static inline void qdisc_reset_all_tx(struct net_device *dev)
744 qdisc_reset_all_tx_gt(dev, 0);
747 /* Are all TX queues of the device empty? */
748 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
753 for (i = 0; i < dev->num_tx_queues; i++) {
754 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
755 const struct Qdisc *q = rcu_dereference(txq->qdisc);
757 if (!qdisc_is_empty(q)) {
766 /* Are any of the TX qdiscs changing? */
767 static inline bool qdisc_tx_changing(const struct net_device *dev)
771 for (i = 0; i < dev->num_tx_queues; i++) {
772 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
773 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
779 /* Is the device using the noop qdisc on all queues? */
780 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
784 for (i = 0; i < dev->num_tx_queues; i++) {
785 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
786 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
792 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
794 return qdisc_skb_cb(skb)->pkt_len;
797 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
798 enum net_xmit_qdisc_t {
799 __NET_XMIT_STOLEN = 0x00010000,
800 __NET_XMIT_BYPASS = 0x00020000,
803 #ifdef CONFIG_NET_CLS_ACT
804 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
806 #define net_xmit_drop_count(e) (1)
809 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
810 const struct Qdisc *sch)
812 #ifdef CONFIG_NET_SCHED
813 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
816 __qdisc_calculate_pkt_len(skb, stab);
820 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
821 struct sk_buff **to_free)
823 qdisc_calculate_pkt_len(skb, sch);
824 return sch->enqueue(skb, sch, to_free);
827 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
828 __u64 bytes, __u32 packets)
830 bstats->bytes += bytes;
831 bstats->packets += packets;
834 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
835 const struct sk_buff *skb)
837 _bstats_update(bstats,
839 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
842 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
843 __u64 bytes, __u32 packets)
845 u64_stats_update_begin(&bstats->syncp);
846 _bstats_update(&bstats->bstats, bytes, packets);
847 u64_stats_update_end(&bstats->syncp);
850 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
851 const struct sk_buff *skb)
853 u64_stats_update_begin(&bstats->syncp);
854 bstats_update(&bstats->bstats, skb);
855 u64_stats_update_end(&bstats->syncp);
858 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
859 const struct sk_buff *skb)
861 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
864 static inline void qdisc_bstats_update(struct Qdisc *sch,
865 const struct sk_buff *skb)
867 bstats_update(&sch->bstats, skb);
870 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
871 const struct sk_buff *skb)
873 sch->qstats.backlog -= qdisc_pkt_len(skb);
876 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
877 const struct sk_buff *skb)
879 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
882 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
883 const struct sk_buff *skb)
885 sch->qstats.backlog += qdisc_pkt_len(skb);
888 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
889 const struct sk_buff *skb)
891 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
894 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
896 this_cpu_inc(sch->cpu_qstats->qlen);
899 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
901 this_cpu_dec(sch->cpu_qstats->qlen);
904 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
906 this_cpu_inc(sch->cpu_qstats->requeues);
909 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
911 sch->qstats.drops += count;
914 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
919 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
921 qstats->overlimits++;
924 static inline void qdisc_qstats_drop(struct Qdisc *sch)
926 qstats_drop_inc(&sch->qstats);
929 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
931 this_cpu_inc(sch->cpu_qstats->drops);
934 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
936 sch->qstats.overlimits++;
939 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
941 __u32 qlen = qdisc_qlen_sum(sch);
943 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
946 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
949 struct gnet_stats_queue qstats = { 0 };
950 __u32 len = qdisc_qlen_sum(sch);
952 __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
954 *backlog = qstats.backlog;
957 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
961 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
962 qdisc_tree_reduce_backlog(sch, qlen, backlog);
965 static inline void qdisc_purge_queue(struct Qdisc *sch)
969 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
971 qdisc_tree_reduce_backlog(sch, qlen, backlog);
974 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
981 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
982 struct qdisc_skb_head *qh)
984 struct sk_buff *last = qh->tail;
997 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
999 __qdisc_enqueue_tail(skb, &sch->q);
1000 qdisc_qstats_backlog_inc(sch, skb);
1001 return NET_XMIT_SUCCESS;
1004 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
1005 struct qdisc_skb_head *qh)
1007 skb->next = qh->head;
1015 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
1017 struct sk_buff *skb = qh->head;
1019 if (likely(skb != NULL)) {
1020 qh->head = skb->next;
1022 if (qh->head == NULL)
1030 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1032 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1034 if (likely(skb != NULL)) {
1035 qdisc_qstats_backlog_dec(sch, skb);
1036 qdisc_bstats_update(sch, skb);
1042 /* Instead of calling kfree_skb() while root qdisc lock is held,
1043 * queue the skb for future freeing at end of __dev_xmit_skb()
1045 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1047 skb->next = *to_free;
1051 static inline void __qdisc_drop_all(struct sk_buff *skb,
1052 struct sk_buff **to_free)
1055 skb->prev->next = *to_free;
1057 skb->next = *to_free;
1061 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1062 struct qdisc_skb_head *qh,
1063 struct sk_buff **to_free)
1065 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1067 if (likely(skb != NULL)) {
1068 unsigned int len = qdisc_pkt_len(skb);
1070 qdisc_qstats_backlog_dec(sch, skb);
1071 __qdisc_drop(skb, to_free);
1078 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
1079 struct sk_buff **to_free)
1081 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
1084 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1086 const struct qdisc_skb_head *qh = &sch->q;
1091 /* generic pseudo peek method for non-work-conserving qdisc */
1092 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1094 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1096 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1098 skb = sch->dequeue(sch);
1101 __skb_queue_head(&sch->gso_skb, skb);
1102 /* it's still part of the queue */
1103 qdisc_qstats_backlog_inc(sch, skb);
1111 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1112 struct sk_buff *skb)
1114 if (qdisc_is_percpu_stats(sch)) {
1115 qdisc_qstats_cpu_backlog_dec(sch, skb);
1116 qdisc_bstats_cpu_update(sch, skb);
1117 qdisc_qstats_cpu_qlen_dec(sch);
1119 qdisc_qstats_backlog_dec(sch, skb);
1120 qdisc_bstats_update(sch, skb);
1125 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1126 unsigned int pkt_len)
1128 if (qdisc_is_percpu_stats(sch)) {
1129 qdisc_qstats_cpu_qlen_inc(sch);
1130 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1132 sch->qstats.backlog += pkt_len;
1137 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1138 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1140 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1143 skb = __skb_dequeue(&sch->gso_skb);
1144 if (qdisc_is_percpu_stats(sch)) {
1145 qdisc_qstats_cpu_backlog_dec(sch, skb);
1146 qdisc_qstats_cpu_qlen_dec(sch);
1148 qdisc_qstats_backlog_dec(sch, skb);
1152 skb = sch->dequeue(sch);
1158 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1161 * We do not know the backlog in bytes of this list, it
1162 * is up to the caller to correct it
1166 rtnl_kfree_skbs(qh->head, qh->tail);
1174 static inline void qdisc_reset_queue(struct Qdisc *sch)
1176 __qdisc_reset_queue(&sch->q);
1177 sch->qstats.backlog = 0;
1180 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1181 struct Qdisc **pold)
1189 qdisc_tree_flush_backlog(old);
1190 sch_tree_unlock(sch);
1195 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1197 rtnl_kfree_skbs(skb, skb);
1198 qdisc_qstats_drop(sch);
1201 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1202 struct sk_buff **to_free)
1204 __qdisc_drop(skb, to_free);
1205 qdisc_qstats_cpu_drop(sch);
1207 return NET_XMIT_DROP;
1210 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1211 struct sk_buff **to_free)
1213 __qdisc_drop(skb, to_free);
1214 qdisc_qstats_drop(sch);
1216 return NET_XMIT_DROP;
1219 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1220 struct sk_buff **to_free)
1222 __qdisc_drop_all(skb, to_free);
1223 qdisc_qstats_drop(sch);
1225 return NET_XMIT_DROP;
1228 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1229 long it will take to send a packet given its size.
1231 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1233 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1236 slot >>= rtab->rate.cell_log;
1238 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1239 return rtab->data[slot];
1242 struct psched_ratecfg {
1243 u64 rate_bytes_ps; /* bytes per second */
1250 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1255 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1256 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1258 return ((u64)len * r->mult) >> r->shift;
1261 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1262 const struct tc_ratespec *conf,
1265 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1266 const struct psched_ratecfg *r)
1268 memset(res, 0, sizeof(*res));
1270 /* legacy struct tc_ratespec has a 32bit @rate field
1271 * Qdisc using 64bit rate should add new attributes
1272 * in order to maintain compatibility.
1274 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1276 res->overhead = r->overhead;
1277 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1280 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1281 * The fast path only needs to access filter list and to update stats
1284 struct tcf_proto *filter_list;
1285 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1286 struct gnet_stats_queue __percpu *cpu_qstats;
1287 struct rcu_head rcu;
1290 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1291 const struct sk_buff *skb)
1293 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1296 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1298 this_cpu_inc(miniq->cpu_qstats->drops);
1301 struct mini_Qdisc_pair {
1302 struct mini_Qdisc miniq1;
1303 struct mini_Qdisc miniq2;
1304 struct mini_Qdisc __rcu **p_miniq;
1307 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1308 struct tcf_proto *tp_head);
1309 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1310 struct mini_Qdisc __rcu **p_miniq);
1312 static inline void skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res)
1314 struct gnet_stats_queue *stats = res->qstats;
1318 ret = netif_receive_skb(skb);
1320 ret = dev_queue_xmit(skb);
1322 qstats_overlimit_inc(res->qstats);