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;
128 netdevice_tracker dev_tracker;
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 /* No need to insist if the MISSED flag was already set.
191 * Note that test_and_set_bit() also gives us memory ordering
192 * guarantees wrt potential earlier enqueue() and below
193 * spin_trylock(), both of which are necessary to prevent races
195 if (test_and_set_bit(__QDISC_STATE_MISSED, &qdisc->state))
198 /* Try to take the lock again to make sure that we will either
199 * grab it or the CPU that still has it will see MISSED set
200 * when testing it in qdisc_run_end()
202 return spin_trylock(&qdisc->seqlock);
204 return !__test_and_set_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
207 static inline void qdisc_run_end(struct Qdisc *qdisc)
209 if (qdisc->flags & TCQ_F_NOLOCK) {
210 spin_unlock(&qdisc->seqlock);
212 /* spin_unlock() only has store-release semantic. The unlock
213 * and test_bit() ordering is a store-load ordering, so a full
214 * memory barrier is needed here.
218 if (unlikely(test_bit(__QDISC_STATE_MISSED,
220 __netif_schedule(qdisc);
222 __clear_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
226 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
228 return qdisc->flags & TCQ_F_ONETXQUEUE;
231 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
234 /* Non-BQL migrated drivers will return 0, too. */
235 return dql_avail(&txq->dql);
241 struct Qdisc_class_ops {
243 /* Child qdisc manipulation */
244 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
245 int (*graft)(struct Qdisc *, unsigned long cl,
246 struct Qdisc *, struct Qdisc **,
247 struct netlink_ext_ack *extack);
248 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
249 void (*qlen_notify)(struct Qdisc *, unsigned long);
251 /* Class manipulation routines */
252 unsigned long (*find)(struct Qdisc *, u32 classid);
253 int (*change)(struct Qdisc *, u32, u32,
254 struct nlattr **, unsigned long *,
255 struct netlink_ext_ack *);
256 int (*delete)(struct Qdisc *, unsigned long,
257 struct netlink_ext_ack *);
258 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
260 /* Filter manipulation */
261 struct tcf_block * (*tcf_block)(struct Qdisc *sch,
263 struct netlink_ext_ack *extack);
264 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
266 void (*unbind_tcf)(struct Qdisc *, unsigned long);
268 /* rtnetlink specific */
269 int (*dump)(struct Qdisc *, unsigned long,
270 struct sk_buff *skb, struct tcmsg*);
271 int (*dump_stats)(struct Qdisc *, unsigned long,
275 /* Qdisc_class_ops flag values */
277 /* Implements API that doesn't require rtnl lock */
278 enum qdisc_class_ops_flags {
279 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
283 struct Qdisc_ops *next;
284 const struct Qdisc_class_ops *cl_ops;
287 unsigned int static_flags;
289 int (*enqueue)(struct sk_buff *skb,
291 struct sk_buff **to_free);
292 struct sk_buff * (*dequeue)(struct Qdisc *);
293 struct sk_buff * (*peek)(struct Qdisc *);
295 int (*init)(struct Qdisc *sch, struct nlattr *arg,
296 struct netlink_ext_ack *extack);
297 void (*reset)(struct Qdisc *);
298 void (*destroy)(struct Qdisc *);
299 int (*change)(struct Qdisc *sch,
301 struct netlink_ext_ack *extack);
302 void (*attach)(struct Qdisc *sch);
303 int (*change_tx_queue_len)(struct Qdisc *, unsigned int);
304 void (*change_real_num_tx)(struct Qdisc *sch,
305 unsigned int new_real_tx);
307 int (*dump)(struct Qdisc *, struct sk_buff *);
308 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
310 void (*ingress_block_set)(struct Qdisc *sch,
312 void (*egress_block_set)(struct Qdisc *sch,
314 u32 (*ingress_block_get)(struct Qdisc *sch);
315 u32 (*egress_block_get)(struct Qdisc *sch);
317 struct module *owner;
327 const struct tcf_proto *goto_tp;
329 /* used in the skb_tc_reinsert function */
332 struct gnet_stats_queue *qstats;
339 struct tcf_proto_ops {
340 struct list_head head;
343 int (*classify)(struct sk_buff *,
344 const struct tcf_proto *,
345 struct tcf_result *);
346 int (*init)(struct tcf_proto*);
347 void (*destroy)(struct tcf_proto *tp, bool rtnl_held,
348 struct netlink_ext_ack *extack);
350 void* (*get)(struct tcf_proto*, u32 handle);
351 void (*put)(struct tcf_proto *tp, void *f);
352 int (*change)(struct net *net, struct sk_buff *,
353 struct tcf_proto*, unsigned long,
354 u32 handle, struct nlattr **,
356 struct netlink_ext_ack *);
357 int (*delete)(struct tcf_proto *tp, void *arg,
358 bool *last, bool rtnl_held,
359 struct netlink_ext_ack *);
360 bool (*delete_empty)(struct tcf_proto *tp);
361 void (*walk)(struct tcf_proto *tp,
362 struct tcf_walker *arg, bool rtnl_held);
363 int (*reoffload)(struct tcf_proto *tp, bool add,
364 flow_setup_cb_t *cb, void *cb_priv,
365 struct netlink_ext_ack *extack);
366 void (*hw_add)(struct tcf_proto *tp,
368 void (*hw_del)(struct tcf_proto *tp,
370 void (*bind_class)(void *, u32, unsigned long,
371 void *, unsigned long);
372 void * (*tmplt_create)(struct net *net,
373 struct tcf_chain *chain,
375 struct netlink_ext_ack *extack);
376 void (*tmplt_destroy)(void *tmplt_priv);
378 /* rtnetlink specific */
379 int (*dump)(struct net*, struct tcf_proto*, void *,
380 struct sk_buff *skb, struct tcmsg*,
382 int (*terse_dump)(struct net *net,
383 struct tcf_proto *tp, void *fh,
385 struct tcmsg *t, bool rtnl_held);
386 int (*tmplt_dump)(struct sk_buff *skb,
390 struct module *owner;
394 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
395 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
396 * conditions can occur when filters are inserted/deleted simultaneously.
398 enum tcf_proto_ops_flags {
399 TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
403 /* Fast access part */
404 struct tcf_proto __rcu *next;
407 /* called under RCU BH lock*/
408 int (*classify)(struct sk_buff *,
409 const struct tcf_proto *,
410 struct tcf_result *);
416 const struct tcf_proto_ops *ops;
417 struct tcf_chain *chain;
418 /* Lock protects tcf_proto shared state and can be used by unlocked
419 * classifiers to protect their private data.
425 struct hlist_node destroy_ht_node;
428 struct qdisc_skb_cb {
430 unsigned int pkt_len;
431 u16 slave_dev_queue_mapping;
434 #define QDISC_CB_PRIV_LEN 20
435 unsigned char data[QDISC_CB_PRIV_LEN];
438 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
441 /* Protects filter_chain. */
442 struct mutex filter_chain_lock;
443 struct tcf_proto __rcu *filter_chain;
444 struct list_head list;
445 struct tcf_block *block;
446 u32 index; /* chain index */
448 unsigned int action_refcnt;
449 bool explicitly_created;
451 const struct tcf_proto_ops *tmplt_ops;
457 /* Lock protects tcf_block and lifetime-management data of chains
458 * attached to the block (refcnt, action_refcnt, explicitly_created).
461 struct list_head chain_list;
462 u32 index; /* block index for shared blocks */
463 u32 classid; /* which class this block belongs to */
467 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
468 struct flow_block flow_block;
469 struct list_head owner_list;
471 atomic_t offloadcnt; /* Number of oddloaded filters */
472 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
473 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
475 struct tcf_chain *chain;
476 struct list_head filter_chain_list;
479 DECLARE_HASHTABLE(proto_destroy_ht, 7);
480 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
483 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
485 return lockdep_is_held(&chain->filter_chain_lock);
488 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
490 return lockdep_is_held(&tp->lock);
493 #define tcf_chain_dereference(p, chain) \
494 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
496 #define tcf_proto_dereference(p, tp) \
497 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
499 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
501 struct qdisc_skb_cb *qcb;
503 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb));
504 BUILD_BUG_ON(sizeof(qcb->data) < sz);
507 static inline int qdisc_qlen(const struct Qdisc *q)
512 static inline int qdisc_qlen_sum(const struct Qdisc *q)
514 __u32 qlen = q->qstats.qlen;
517 if (qdisc_is_percpu_stats(q)) {
518 for_each_possible_cpu(i)
519 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
527 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
529 return (struct qdisc_skb_cb *)skb->cb;
532 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
534 return &qdisc->q.lock;
537 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
539 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
544 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
546 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
549 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
551 return qdisc->dev_queue->qdisc_sleeping;
554 /* The qdisc root lock is a mechanism by which to top level
555 * of a qdisc tree can be locked from any qdisc node in the
556 * forest. This allows changing the configuration of some
557 * aspect of the qdisc tree while blocking out asynchronous
558 * qdisc access in the packet processing paths.
560 * It is only legal to do this when the root will not change
561 * on us. Otherwise we'll potentially lock the wrong qdisc
562 * root. This is enforced by holding the RTNL semaphore, which
563 * all users of this lock accessor must do.
565 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
567 struct Qdisc *root = qdisc_root(qdisc);
570 return qdisc_lock(root);
573 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
575 struct Qdisc *root = qdisc_root_sleeping(qdisc);
578 return qdisc_lock(root);
581 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
583 return qdisc->dev_queue->dev;
586 static inline void sch_tree_lock(struct Qdisc *q)
588 if (q->flags & TCQ_F_MQROOT)
589 spin_lock_bh(qdisc_lock(q));
591 spin_lock_bh(qdisc_root_sleeping_lock(q));
594 static inline void sch_tree_unlock(struct Qdisc *q)
596 if (q->flags & TCQ_F_MQROOT)
597 spin_unlock_bh(qdisc_lock(q));
599 spin_unlock_bh(qdisc_root_sleeping_lock(q));
602 extern struct Qdisc noop_qdisc;
603 extern struct Qdisc_ops noop_qdisc_ops;
604 extern struct Qdisc_ops pfifo_fast_ops;
605 extern struct Qdisc_ops mq_qdisc_ops;
606 extern struct Qdisc_ops noqueue_qdisc_ops;
607 extern const struct Qdisc_ops *default_qdisc_ops;
608 static inline const struct Qdisc_ops *
609 get_default_qdisc_ops(const struct net_device *dev, int ntx)
611 return ntx < dev->real_num_tx_queues ?
612 default_qdisc_ops : &pfifo_fast_ops;
615 struct Qdisc_class_common {
617 struct hlist_node hnode;
620 struct Qdisc_class_hash {
621 struct hlist_head *hash;
622 unsigned int hashsize;
623 unsigned int hashmask;
624 unsigned int hashelems;
627 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
634 static inline struct Qdisc_class_common *
635 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
637 struct Qdisc_class_common *cl;
643 h = qdisc_class_hash(id, hash->hashmask);
644 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
645 if (cl->classid == id)
651 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
653 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
655 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
658 int qdisc_class_hash_init(struct Qdisc_class_hash *);
659 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
660 struct Qdisc_class_common *);
661 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
662 struct Qdisc_class_common *);
663 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
664 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
666 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
667 void dev_qdisc_change_real_num_tx(struct net_device *dev,
668 unsigned int new_real_tx);
669 void dev_init_scheduler(struct net_device *dev);
670 void dev_shutdown(struct net_device *dev);
671 void dev_activate(struct net_device *dev);
672 void dev_deactivate(struct net_device *dev);
673 void dev_deactivate_many(struct list_head *head);
674 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
675 struct Qdisc *qdisc);
676 void qdisc_reset(struct Qdisc *qdisc);
677 void qdisc_put(struct Qdisc *qdisc);
678 void qdisc_put_unlocked(struct Qdisc *qdisc);
679 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
680 #ifdef CONFIG_NET_SCHED
681 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
683 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
684 struct Qdisc *new, struct Qdisc *old,
685 enum tc_setup_type type, void *type_data,
686 struct netlink_ext_ack *extack);
689 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
692 q->flags &= ~TCQ_F_OFFLOADED;
697 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
698 struct Qdisc *new, struct Qdisc *old,
699 enum tc_setup_type type, void *type_data,
700 struct netlink_ext_ack *extack)
704 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
705 const struct Qdisc_ops *ops,
706 struct netlink_ext_ack *extack);
707 void qdisc_free(struct Qdisc *qdisc);
708 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
709 const struct Qdisc_ops *ops, u32 parentid,
710 struct netlink_ext_ack *extack);
711 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
712 const struct qdisc_size_table *stab);
713 int skb_do_redirect(struct sk_buff *);
715 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
717 #ifdef CONFIG_NET_CLS_ACT
718 return skb->tc_at_ingress;
724 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
726 #ifdef CONFIG_NET_CLS_ACT
727 if (skb->tc_skip_classify) {
728 skb->tc_skip_classify = 0;
735 /* Reset all TX qdiscs greater than index of a device. */
736 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
740 for (; i < dev->num_tx_queues; i++) {
741 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
743 spin_lock_bh(qdisc_lock(qdisc));
745 spin_unlock_bh(qdisc_lock(qdisc));
750 /* Are all TX queues of the device empty? */
751 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
756 for (i = 0; i < dev->num_tx_queues; i++) {
757 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
758 const struct Qdisc *q = rcu_dereference(txq->qdisc);
760 if (!qdisc_is_empty(q)) {
769 /* Are any of the TX qdiscs changing? */
770 static inline bool qdisc_tx_changing(const struct net_device *dev)
774 for (i = 0; i < dev->num_tx_queues; i++) {
775 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
776 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
782 /* Is the device using the noop qdisc on all queues? */
783 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
787 for (i = 0; i < dev->num_tx_queues; i++) {
788 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
789 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
795 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
797 return qdisc_skb_cb(skb)->pkt_len;
800 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
801 enum net_xmit_qdisc_t {
802 __NET_XMIT_STOLEN = 0x00010000,
803 __NET_XMIT_BYPASS = 0x00020000,
806 #ifdef CONFIG_NET_CLS_ACT
807 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
809 #define net_xmit_drop_count(e) (1)
812 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
813 const struct Qdisc *sch)
815 #ifdef CONFIG_NET_SCHED
816 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
819 __qdisc_calculate_pkt_len(skb, stab);
823 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
824 struct sk_buff **to_free)
826 qdisc_calculate_pkt_len(skb, sch);
827 return sch->enqueue(skb, sch, to_free);
830 static inline void _bstats_update(struct gnet_stats_basic_sync *bstats,
831 __u64 bytes, __u32 packets)
833 u64_stats_update_begin(&bstats->syncp);
834 u64_stats_add(&bstats->bytes, bytes);
835 u64_stats_add(&bstats->packets, packets);
836 u64_stats_update_end(&bstats->syncp);
839 static inline void bstats_update(struct gnet_stats_basic_sync *bstats,
840 const struct sk_buff *skb)
842 _bstats_update(bstats,
844 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
847 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
848 const struct sk_buff *skb)
850 bstats_update(this_cpu_ptr(sch->cpu_bstats), skb);
853 static inline void qdisc_bstats_update(struct Qdisc *sch,
854 const struct sk_buff *skb)
856 bstats_update(&sch->bstats, skb);
859 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
860 const struct sk_buff *skb)
862 sch->qstats.backlog -= qdisc_pkt_len(skb);
865 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
866 const struct sk_buff *skb)
868 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
871 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
872 const struct sk_buff *skb)
874 sch->qstats.backlog += qdisc_pkt_len(skb);
877 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
878 const struct sk_buff *skb)
880 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
883 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
885 this_cpu_inc(sch->cpu_qstats->qlen);
888 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
890 this_cpu_dec(sch->cpu_qstats->qlen);
893 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
895 this_cpu_inc(sch->cpu_qstats->requeues);
898 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
900 sch->qstats.drops += count;
903 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
908 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
910 qstats->overlimits++;
913 static inline void qdisc_qstats_drop(struct Qdisc *sch)
915 qstats_drop_inc(&sch->qstats);
918 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
920 this_cpu_inc(sch->cpu_qstats->drops);
923 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
925 sch->qstats.overlimits++;
928 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
930 __u32 qlen = qdisc_qlen_sum(sch);
932 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
935 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
938 struct gnet_stats_queue qstats = { 0 };
940 gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats);
941 *qlen = qstats.qlen + qdisc_qlen(sch);
942 *backlog = qstats.backlog;
945 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
949 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
950 qdisc_tree_reduce_backlog(sch, qlen, backlog);
953 static inline void qdisc_purge_queue(struct Qdisc *sch)
957 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
959 qdisc_tree_reduce_backlog(sch, qlen, backlog);
962 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
969 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
970 struct qdisc_skb_head *qh)
972 struct sk_buff *last = qh->tail;
985 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
987 __qdisc_enqueue_tail(skb, &sch->q);
988 qdisc_qstats_backlog_inc(sch, skb);
989 return NET_XMIT_SUCCESS;
992 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
993 struct qdisc_skb_head *qh)
995 skb->next = qh->head;
1003 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
1005 struct sk_buff *skb = qh->head;
1007 if (likely(skb != NULL)) {
1008 qh->head = skb->next;
1010 if (qh->head == NULL)
1018 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1020 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1022 if (likely(skb != NULL)) {
1023 qdisc_qstats_backlog_dec(sch, skb);
1024 qdisc_bstats_update(sch, skb);
1030 /* Instead of calling kfree_skb() while root qdisc lock is held,
1031 * queue the skb for future freeing at end of __dev_xmit_skb()
1033 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1035 skb->next = *to_free;
1039 static inline void __qdisc_drop_all(struct sk_buff *skb,
1040 struct sk_buff **to_free)
1043 skb->prev->next = *to_free;
1045 skb->next = *to_free;
1049 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1050 struct qdisc_skb_head *qh,
1051 struct sk_buff **to_free)
1053 struct sk_buff *skb = __qdisc_dequeue_head(qh);
1055 if (likely(skb != NULL)) {
1056 unsigned int len = qdisc_pkt_len(skb);
1058 qdisc_qstats_backlog_dec(sch, skb);
1059 __qdisc_drop(skb, to_free);
1066 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1068 const struct qdisc_skb_head *qh = &sch->q;
1073 /* generic pseudo peek method for non-work-conserving qdisc */
1074 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1076 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1078 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1080 skb = sch->dequeue(sch);
1083 __skb_queue_head(&sch->gso_skb, skb);
1084 /* it's still part of the queue */
1085 qdisc_qstats_backlog_inc(sch, skb);
1093 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1094 struct sk_buff *skb)
1096 if (qdisc_is_percpu_stats(sch)) {
1097 qdisc_qstats_cpu_backlog_dec(sch, skb);
1098 qdisc_bstats_cpu_update(sch, skb);
1099 qdisc_qstats_cpu_qlen_dec(sch);
1101 qdisc_qstats_backlog_dec(sch, skb);
1102 qdisc_bstats_update(sch, skb);
1107 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1108 unsigned int pkt_len)
1110 if (qdisc_is_percpu_stats(sch)) {
1111 qdisc_qstats_cpu_qlen_inc(sch);
1112 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1114 sch->qstats.backlog += pkt_len;
1119 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1120 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1122 struct sk_buff *skb = skb_peek(&sch->gso_skb);
1125 skb = __skb_dequeue(&sch->gso_skb);
1126 if (qdisc_is_percpu_stats(sch)) {
1127 qdisc_qstats_cpu_backlog_dec(sch, skb);
1128 qdisc_qstats_cpu_qlen_dec(sch);
1130 qdisc_qstats_backlog_dec(sch, skb);
1134 skb = sch->dequeue(sch);
1140 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1143 * We do not know the backlog in bytes of this list, it
1144 * is up to the caller to correct it
1148 rtnl_kfree_skbs(qh->head, qh->tail);
1156 static inline void qdisc_reset_queue(struct Qdisc *sch)
1158 __qdisc_reset_queue(&sch->q);
1159 sch->qstats.backlog = 0;
1162 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1163 struct Qdisc **pold)
1171 qdisc_purge_queue(old);
1172 sch_tree_unlock(sch);
1177 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1179 rtnl_kfree_skbs(skb, skb);
1180 qdisc_qstats_drop(sch);
1183 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1184 struct sk_buff **to_free)
1186 __qdisc_drop(skb, to_free);
1187 qdisc_qstats_cpu_drop(sch);
1189 return NET_XMIT_DROP;
1192 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1193 struct sk_buff **to_free)
1195 __qdisc_drop(skb, to_free);
1196 qdisc_qstats_drop(sch);
1198 return NET_XMIT_DROP;
1201 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1202 struct sk_buff **to_free)
1204 __qdisc_drop_all(skb, to_free);
1205 qdisc_qstats_drop(sch);
1207 return NET_XMIT_DROP;
1210 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1211 long it will take to send a packet given its size.
1213 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1215 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1218 slot >>= rtab->rate.cell_log;
1220 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1221 return rtab->data[slot];
1224 struct psched_ratecfg {
1225 u64 rate_bytes_ps; /* bytes per second */
1233 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1241 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1242 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1244 return ((u64)len * r->mult) >> r->shift;
1247 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1248 const struct tc_ratespec *conf,
1251 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1252 const struct psched_ratecfg *r)
1254 memset(res, 0, sizeof(*res));
1256 /* legacy struct tc_ratespec has a 32bit @rate field
1257 * Qdisc using 64bit rate should add new attributes
1258 * in order to maintain compatibility.
1260 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1262 res->overhead = r->overhead;
1264 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1267 struct psched_pktrate {
1268 u64 rate_pkts_ps; /* packets per second */
1273 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r,
1274 unsigned int pkt_num)
1276 return ((u64)pkt_num * r->mult) >> r->shift;
1279 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64);
1281 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1282 * The fast path only needs to access filter list and to update stats
1285 struct tcf_proto *filter_list;
1286 struct tcf_block *block;
1287 struct gnet_stats_basic_sync __percpu *cpu_bstats;
1288 struct gnet_stats_queue __percpu *cpu_qstats;
1289 unsigned long rcu_state;
1292 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1293 const struct sk_buff *skb)
1295 bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1298 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1300 this_cpu_inc(miniq->cpu_qstats->drops);
1303 struct mini_Qdisc_pair {
1304 struct mini_Qdisc miniq1;
1305 struct mini_Qdisc miniq2;
1306 struct mini_Qdisc __rcu **p_miniq;
1309 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1310 struct tcf_proto *tp_head);
1311 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1312 struct mini_Qdisc __rcu **p_miniq);
1313 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1314 struct tcf_block *block);
1316 void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx);
1318 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));