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 <net/gen_stats.h>
16 #include <net/rtnetlink.h>
23 struct qdisc_rate_table
{
24 struct tc_ratespec rate
;
26 struct qdisc_rate_table
*next
;
32 __QDISC_STATE_DEACTIVATED
,
35 struct qdisc_size_table
{
37 struct list_head list
;
38 struct tc_sizespec szopts
;
43 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
44 struct qdisc_skb_head
{
52 int (*enqueue
)(struct sk_buff
*skb
,
54 struct sk_buff
**to_free
);
55 struct sk_buff
* (*dequeue
)(struct Qdisc
*sch
);
57 #define TCQ_F_BUILTIN 1
58 #define TCQ_F_INGRESS 2
59 #define TCQ_F_CAN_BYPASS 4
60 #define TCQ_F_MQROOT 8
61 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
62 * q->dev_queue : It can test
63 * netif_xmit_frozen_or_stopped() before
64 * dequeueing next packet.
65 * Its true for MQ/MQPRIO slaves, or non
68 #define TCQ_F_WARN_NONWC (1 << 16)
69 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
70 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
71 * qdisc_tree_decrease_qlen() should stop.
73 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
75 const struct Qdisc_ops
*ops
;
76 struct qdisc_size_table __rcu
*stab
;
77 struct hlist_node hash
;
81 struct netdev_queue
*dev_queue
;
83 struct net_rate_estimator __rcu
*rate_est
;
84 struct gnet_stats_basic_cpu __percpu
*cpu_bstats
;
85 struct gnet_stats_queue __percpu
*cpu_qstats
;
88 * For performance sake on SMP, we put highly modified fields at the end
90 struct sk_buff
*gso_skb ____cacheline_aligned_in_smp
;
91 struct qdisc_skb_head q
;
92 struct gnet_stats_basic_packed bstats
;
94 struct gnet_stats_queue qstats
;
96 struct Qdisc
*next_sched
;
97 struct sk_buff
*skb_bad_txq
;
101 spinlock_t busylock ____cacheline_aligned_in_smp
;
104 static inline void qdisc_refcount_inc(struct Qdisc
*qdisc
)
106 if (qdisc
->flags
& TCQ_F_BUILTIN
)
108 refcount_inc(&qdisc
->refcnt
);
111 static inline bool qdisc_is_running(const struct Qdisc
*qdisc
)
113 return (raw_read_seqcount(&qdisc
->running
) & 1) ? true : false;
116 static inline bool qdisc_run_begin(struct Qdisc
*qdisc
)
118 if (qdisc_is_running(qdisc
))
120 /* Variant of write_seqcount_begin() telling lockdep a trylock
123 raw_write_seqcount_begin(&qdisc
->running
);
124 seqcount_acquire(&qdisc
->running
.dep_map
, 0, 1, _RET_IP_
);
128 static inline void qdisc_run_end(struct Qdisc
*qdisc
)
130 write_seqcount_end(&qdisc
->running
);
133 static inline bool qdisc_may_bulk(const struct Qdisc
*qdisc
)
135 return qdisc
->flags
& TCQ_F_ONETXQUEUE
;
138 static inline int qdisc_avail_bulklimit(const struct netdev_queue
*txq
)
141 /* Non-BQL migrated drivers will return 0, too. */
142 return dql_avail(&txq
->dql
);
148 struct Qdisc_class_ops
{
149 /* Child qdisc manipulation */
150 struct netdev_queue
* (*select_queue
)(struct Qdisc
*, struct tcmsg
*);
151 int (*graft
)(struct Qdisc
*, unsigned long cl
,
152 struct Qdisc
*, struct Qdisc
**);
153 struct Qdisc
* (*leaf
)(struct Qdisc
*, unsigned long cl
);
154 void (*qlen_notify
)(struct Qdisc
*, unsigned long);
156 /* Class manipulation routines */
157 unsigned long (*find
)(struct Qdisc
*, u32 classid
);
158 int (*change
)(struct Qdisc
*, u32
, u32
,
159 struct nlattr
**, unsigned long *);
160 int (*delete)(struct Qdisc
*, unsigned long);
161 void (*walk
)(struct Qdisc
*, struct qdisc_walker
* arg
);
163 /* Filter manipulation */
164 struct tcf_block
* (*tcf_block
)(struct Qdisc
*, unsigned long);
165 unsigned long (*bind_tcf
)(struct Qdisc
*, unsigned long,
167 void (*unbind_tcf
)(struct Qdisc
*, unsigned long);
169 /* rtnetlink specific */
170 int (*dump
)(struct Qdisc
*, unsigned long,
171 struct sk_buff
*skb
, struct tcmsg
*);
172 int (*dump_stats
)(struct Qdisc
*, unsigned long,
177 struct Qdisc_ops
*next
;
178 const struct Qdisc_class_ops
*cl_ops
;
182 int (*enqueue
)(struct sk_buff
*skb
,
184 struct sk_buff
**to_free
);
185 struct sk_buff
* (*dequeue
)(struct Qdisc
*);
186 struct sk_buff
* (*peek
)(struct Qdisc
*);
188 int (*init
)(struct Qdisc
*, struct nlattr
*arg
);
189 void (*reset
)(struct Qdisc
*);
190 void (*destroy
)(struct Qdisc
*);
191 int (*change
)(struct Qdisc
*, struct nlattr
*arg
);
192 void (*attach
)(struct Qdisc
*);
194 int (*dump
)(struct Qdisc
*, struct sk_buff
*);
195 int (*dump_stats
)(struct Qdisc
*, struct gnet_dump
*);
197 struct module
*owner
;
207 const struct tcf_proto
*goto_tp
;
211 struct tcf_proto_ops
{
212 struct list_head head
;
215 int (*classify
)(struct sk_buff
*,
216 const struct tcf_proto
*,
217 struct tcf_result
*);
218 int (*init
)(struct tcf_proto
*);
219 void (*destroy
)(struct tcf_proto
*);
221 void* (*get
)(struct tcf_proto
*, u32 handle
);
222 int (*change
)(struct net
*net
, struct sk_buff
*,
223 struct tcf_proto
*, unsigned long,
224 u32 handle
, struct nlattr
**,
226 int (*delete)(struct tcf_proto
*, void *, bool*);
227 void (*walk
)(struct tcf_proto
*, struct tcf_walker
*arg
);
228 void (*bind_class
)(void *, u32
, unsigned long);
230 /* rtnetlink specific */
231 int (*dump
)(struct net
*, struct tcf_proto
*, void *,
232 struct sk_buff
*skb
, struct tcmsg
*);
234 struct module
*owner
;
238 /* Fast access part */
239 struct tcf_proto __rcu
*next
;
241 int (*classify
)(struct sk_buff
*,
242 const struct tcf_proto
*,
243 struct tcf_result
*);
251 const struct tcf_proto_ops
*ops
;
252 struct tcf_chain
*chain
;
256 struct qdisc_skb_cb
{
257 unsigned int pkt_len
;
258 u16 slave_dev_queue_mapping
;
260 #define QDISC_CB_PRIV_LEN 20
261 unsigned char data
[QDISC_CB_PRIV_LEN
];
264 typedef void tcf_chain_head_change_t(struct tcf_proto
*tp_head
, void *priv
);
267 struct tcf_proto __rcu
*filter_chain
;
268 tcf_chain_head_change_t
*chain_head_change
;
269 void *chain_head_change_priv
;
270 struct list_head list
;
271 struct tcf_block
*block
;
272 u32 index
; /* chain index */
277 struct list_head chain_list
;
280 struct list_head cb_list
;
281 struct work_struct work
;
284 static inline void qdisc_cb_private_validate(const struct sk_buff
*skb
, int sz
)
286 struct qdisc_skb_cb
*qcb
;
288 BUILD_BUG_ON(sizeof(skb
->cb
) < offsetof(struct qdisc_skb_cb
, data
) + sz
);
289 BUILD_BUG_ON(sizeof(qcb
->data
) < sz
);
292 static inline int qdisc_qlen(const struct Qdisc
*q
)
297 static inline struct qdisc_skb_cb
*qdisc_skb_cb(const struct sk_buff
*skb
)
299 return (struct qdisc_skb_cb
*)skb
->cb
;
302 static inline spinlock_t
*qdisc_lock(struct Qdisc
*qdisc
)
304 return &qdisc
->q
.lock
;
307 static inline struct Qdisc
*qdisc_root(const struct Qdisc
*qdisc
)
309 struct Qdisc
*q
= rcu_dereference_rtnl(qdisc
->dev_queue
->qdisc
);
314 static inline struct Qdisc
*qdisc_root_sleeping(const struct Qdisc
*qdisc
)
316 return qdisc
->dev_queue
->qdisc_sleeping
;
319 /* The qdisc root lock is a mechanism by which to top level
320 * of a qdisc tree can be locked from any qdisc node in the
321 * forest. This allows changing the configuration of some
322 * aspect of the qdisc tree while blocking out asynchronous
323 * qdisc access in the packet processing paths.
325 * It is only legal to do this when the root will not change
326 * on us. Otherwise we'll potentially lock the wrong qdisc
327 * root. This is enforced by holding the RTNL semaphore, which
328 * all users of this lock accessor must do.
330 static inline spinlock_t
*qdisc_root_lock(const struct Qdisc
*qdisc
)
332 struct Qdisc
*root
= qdisc_root(qdisc
);
335 return qdisc_lock(root
);
338 static inline spinlock_t
*qdisc_root_sleeping_lock(const struct Qdisc
*qdisc
)
340 struct Qdisc
*root
= qdisc_root_sleeping(qdisc
);
343 return qdisc_lock(root
);
346 static inline seqcount_t
*qdisc_root_sleeping_running(const struct Qdisc
*qdisc
)
348 struct Qdisc
*root
= qdisc_root_sleeping(qdisc
);
351 return &root
->running
;
354 static inline struct net_device
*qdisc_dev(const struct Qdisc
*qdisc
)
356 return qdisc
->dev_queue
->dev
;
359 static inline void sch_tree_lock(const struct Qdisc
*q
)
361 spin_lock_bh(qdisc_root_sleeping_lock(q
));
364 static inline void sch_tree_unlock(const struct Qdisc
*q
)
366 spin_unlock_bh(qdisc_root_sleeping_lock(q
));
369 extern struct Qdisc noop_qdisc
;
370 extern struct Qdisc_ops noop_qdisc_ops
;
371 extern struct Qdisc_ops pfifo_fast_ops
;
372 extern struct Qdisc_ops mq_qdisc_ops
;
373 extern struct Qdisc_ops noqueue_qdisc_ops
;
374 extern const struct Qdisc_ops
*default_qdisc_ops
;
375 static inline const struct Qdisc_ops
*
376 get_default_qdisc_ops(const struct net_device
*dev
, int ntx
)
378 return ntx
< dev
->real_num_tx_queues
?
379 default_qdisc_ops
: &pfifo_fast_ops
;
382 struct Qdisc_class_common
{
384 struct hlist_node hnode
;
387 struct Qdisc_class_hash
{
388 struct hlist_head
*hash
;
389 unsigned int hashsize
;
390 unsigned int hashmask
;
391 unsigned int hashelems
;
394 static inline unsigned int qdisc_class_hash(u32 id
, u32 mask
)
401 static inline struct Qdisc_class_common
*
402 qdisc_class_find(const struct Qdisc_class_hash
*hash
, u32 id
)
404 struct Qdisc_class_common
*cl
;
410 h
= qdisc_class_hash(id
, hash
->hashmask
);
411 hlist_for_each_entry(cl
, &hash
->hash
[h
], hnode
) {
412 if (cl
->classid
== id
)
418 static inline int tc_classid_to_hwtc(struct net_device
*dev
, u32 classid
)
420 u32 hwtc
= TC_H_MIN(classid
) - TC_H_MIN_PRIORITY
;
422 return (hwtc
< netdev_get_num_tc(dev
)) ? hwtc
: -EINVAL
;
425 int qdisc_class_hash_init(struct Qdisc_class_hash
*);
426 void qdisc_class_hash_insert(struct Qdisc_class_hash
*,
427 struct Qdisc_class_common
*);
428 void qdisc_class_hash_remove(struct Qdisc_class_hash
*,
429 struct Qdisc_class_common
*);
430 void qdisc_class_hash_grow(struct Qdisc
*, struct Qdisc_class_hash
*);
431 void qdisc_class_hash_destroy(struct Qdisc_class_hash
*);
433 void dev_init_scheduler(struct net_device
*dev
);
434 void dev_shutdown(struct net_device
*dev
);
435 void dev_activate(struct net_device
*dev
);
436 void dev_deactivate(struct net_device
*dev
);
437 void dev_deactivate_many(struct list_head
*head
);
438 struct Qdisc
*dev_graft_qdisc(struct netdev_queue
*dev_queue
,
439 struct Qdisc
*qdisc
);
440 void qdisc_reset(struct Qdisc
*qdisc
);
441 void qdisc_destroy(struct Qdisc
*qdisc
);
442 void qdisc_tree_reduce_backlog(struct Qdisc
*qdisc
, unsigned int n
,
444 struct Qdisc
*qdisc_alloc(struct netdev_queue
*dev_queue
,
445 const struct Qdisc_ops
*ops
);
446 struct Qdisc
*qdisc_create_dflt(struct netdev_queue
*dev_queue
,
447 const struct Qdisc_ops
*ops
, u32 parentid
);
448 void __qdisc_calculate_pkt_len(struct sk_buff
*skb
,
449 const struct qdisc_size_table
*stab
);
450 int skb_do_redirect(struct sk_buff
*);
452 static inline void skb_reset_tc(struct sk_buff
*skb
)
454 #ifdef CONFIG_NET_CLS_ACT
455 skb
->tc_redirected
= 0;
459 static inline bool skb_at_tc_ingress(const struct sk_buff
*skb
)
461 #ifdef CONFIG_NET_CLS_ACT
462 return skb
->tc_at_ingress
;
468 static inline bool skb_skip_tc_classify(struct sk_buff
*skb
)
470 #ifdef CONFIG_NET_CLS_ACT
471 if (skb
->tc_skip_classify
) {
472 skb
->tc_skip_classify
= 0;
479 /* Reset all TX qdiscs greater then index of a device. */
480 static inline void qdisc_reset_all_tx_gt(struct net_device
*dev
, unsigned int i
)
484 for (; i
< dev
->num_tx_queues
; i
++) {
485 qdisc
= rtnl_dereference(netdev_get_tx_queue(dev
, i
)->qdisc
);
487 spin_lock_bh(qdisc_lock(qdisc
));
489 spin_unlock_bh(qdisc_lock(qdisc
));
494 static inline void qdisc_reset_all_tx(struct net_device
*dev
)
496 qdisc_reset_all_tx_gt(dev
, 0);
499 /* Are all TX queues of the device empty? */
500 static inline bool qdisc_all_tx_empty(const struct net_device
*dev
)
505 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
506 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
507 const struct Qdisc
*q
= rcu_dereference(txq
->qdisc
);
518 /* Are any of the TX qdiscs changing? */
519 static inline bool qdisc_tx_changing(const struct net_device
*dev
)
523 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
524 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
525 if (rcu_access_pointer(txq
->qdisc
) != txq
->qdisc_sleeping
)
531 /* Is the device using the noop qdisc on all queues? */
532 static inline bool qdisc_tx_is_noop(const struct net_device
*dev
)
536 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
537 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
538 if (rcu_access_pointer(txq
->qdisc
) != &noop_qdisc
)
544 static inline unsigned int qdisc_pkt_len(const struct sk_buff
*skb
)
546 return qdisc_skb_cb(skb
)->pkt_len
;
549 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
550 enum net_xmit_qdisc_t
{
551 __NET_XMIT_STOLEN
= 0x00010000,
552 __NET_XMIT_BYPASS
= 0x00020000,
555 #ifdef CONFIG_NET_CLS_ACT
556 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
558 #define net_xmit_drop_count(e) (1)
561 static inline void qdisc_calculate_pkt_len(struct sk_buff
*skb
,
562 const struct Qdisc
*sch
)
564 #ifdef CONFIG_NET_SCHED
565 struct qdisc_size_table
*stab
= rcu_dereference_bh(sch
->stab
);
568 __qdisc_calculate_pkt_len(skb
, stab
);
572 static inline int qdisc_enqueue(struct sk_buff
*skb
, struct Qdisc
*sch
,
573 struct sk_buff
**to_free
)
575 qdisc_calculate_pkt_len(skb
, sch
);
576 return sch
->enqueue(skb
, sch
, to_free
);
579 static inline bool qdisc_is_percpu_stats(const struct Qdisc
*q
)
581 return q
->flags
& TCQ_F_CPUSTATS
;
584 static inline void _bstats_update(struct gnet_stats_basic_packed
*bstats
,
585 __u64 bytes
, __u32 packets
)
587 bstats
->bytes
+= bytes
;
588 bstats
->packets
+= packets
;
591 static inline void bstats_update(struct gnet_stats_basic_packed
*bstats
,
592 const struct sk_buff
*skb
)
594 _bstats_update(bstats
,
596 skb_is_gso(skb
) ? skb_shinfo(skb
)->gso_segs
: 1);
599 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu
*bstats
,
600 __u64 bytes
, __u32 packets
)
602 u64_stats_update_begin(&bstats
->syncp
);
603 _bstats_update(&bstats
->bstats
, bytes
, packets
);
604 u64_stats_update_end(&bstats
->syncp
);
607 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu
*bstats
,
608 const struct sk_buff
*skb
)
610 u64_stats_update_begin(&bstats
->syncp
);
611 bstats_update(&bstats
->bstats
, skb
);
612 u64_stats_update_end(&bstats
->syncp
);
615 static inline void qdisc_bstats_cpu_update(struct Qdisc
*sch
,
616 const struct sk_buff
*skb
)
618 bstats_cpu_update(this_cpu_ptr(sch
->cpu_bstats
), skb
);
621 static inline void qdisc_bstats_update(struct Qdisc
*sch
,
622 const struct sk_buff
*skb
)
624 bstats_update(&sch
->bstats
, skb
);
627 static inline void qdisc_qstats_backlog_dec(struct Qdisc
*sch
,
628 const struct sk_buff
*skb
)
630 sch
->qstats
.backlog
-= qdisc_pkt_len(skb
);
633 static inline void qdisc_qstats_backlog_inc(struct Qdisc
*sch
,
634 const struct sk_buff
*skb
)
636 sch
->qstats
.backlog
+= qdisc_pkt_len(skb
);
639 static inline void __qdisc_qstats_drop(struct Qdisc
*sch
, int count
)
641 sch
->qstats
.drops
+= count
;
644 static inline void qstats_drop_inc(struct gnet_stats_queue
*qstats
)
649 static inline void qstats_overlimit_inc(struct gnet_stats_queue
*qstats
)
651 qstats
->overlimits
++;
654 static inline void qdisc_qstats_drop(struct Qdisc
*sch
)
656 qstats_drop_inc(&sch
->qstats
);
659 static inline void qdisc_qstats_cpu_drop(struct Qdisc
*sch
)
661 this_cpu_inc(sch
->cpu_qstats
->drops
);
664 static inline void qdisc_qstats_overlimit(struct Qdisc
*sch
)
666 sch
->qstats
.overlimits
++;
669 static inline void qdisc_skb_head_init(struct qdisc_skb_head
*qh
)
676 static inline int __qdisc_enqueue_tail(struct sk_buff
*skb
, struct Qdisc
*sch
,
677 struct qdisc_skb_head
*qh
)
679 struct sk_buff
*last
= qh
->tail
;
690 qdisc_qstats_backlog_inc(sch
, skb
);
692 return NET_XMIT_SUCCESS
;
695 static inline int qdisc_enqueue_tail(struct sk_buff
*skb
, struct Qdisc
*sch
)
697 return __qdisc_enqueue_tail(skb
, sch
, &sch
->q
);
700 static inline struct sk_buff
*__qdisc_dequeue_head(struct qdisc_skb_head
*qh
)
702 struct sk_buff
*skb
= qh
->head
;
704 if (likely(skb
!= NULL
)) {
705 qh
->head
= skb
->next
;
707 if (qh
->head
== NULL
)
715 static inline struct sk_buff
*qdisc_dequeue_head(struct Qdisc
*sch
)
717 struct sk_buff
*skb
= __qdisc_dequeue_head(&sch
->q
);
719 if (likely(skb
!= NULL
)) {
720 qdisc_qstats_backlog_dec(sch
, skb
);
721 qdisc_bstats_update(sch
, skb
);
727 /* Instead of calling kfree_skb() while root qdisc lock is held,
728 * queue the skb for future freeing at end of __dev_xmit_skb()
730 static inline void __qdisc_drop(struct sk_buff
*skb
, struct sk_buff
**to_free
)
732 skb
->next
= *to_free
;
736 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc
*sch
,
737 struct qdisc_skb_head
*qh
,
738 struct sk_buff
**to_free
)
740 struct sk_buff
*skb
= __qdisc_dequeue_head(qh
);
742 if (likely(skb
!= NULL
)) {
743 unsigned int len
= qdisc_pkt_len(skb
);
745 qdisc_qstats_backlog_dec(sch
, skb
);
746 __qdisc_drop(skb
, to_free
);
753 static inline unsigned int qdisc_queue_drop_head(struct Qdisc
*sch
,
754 struct sk_buff
**to_free
)
756 return __qdisc_queue_drop_head(sch
, &sch
->q
, to_free
);
759 static inline struct sk_buff
*qdisc_peek_head(struct Qdisc
*sch
)
761 const struct qdisc_skb_head
*qh
= &sch
->q
;
766 /* generic pseudo peek method for non-work-conserving qdisc */
767 static inline struct sk_buff
*qdisc_peek_dequeued(struct Qdisc
*sch
)
769 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
771 sch
->gso_skb
= sch
->dequeue(sch
);
773 /* it's still part of the queue */
774 qdisc_qstats_backlog_inc(sch
, sch
->gso_skb
);
782 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
783 static inline struct sk_buff
*qdisc_dequeue_peeked(struct Qdisc
*sch
)
785 struct sk_buff
*skb
= sch
->gso_skb
;
789 qdisc_qstats_backlog_dec(sch
, skb
);
792 skb
= sch
->dequeue(sch
);
798 static inline void __qdisc_reset_queue(struct qdisc_skb_head
*qh
)
801 * We do not know the backlog in bytes of this list, it
802 * is up to the caller to correct it
806 rtnl_kfree_skbs(qh
->head
, qh
->tail
);
814 static inline void qdisc_reset_queue(struct Qdisc
*sch
)
816 __qdisc_reset_queue(&sch
->q
);
817 sch
->qstats
.backlog
= 0;
820 static inline struct Qdisc
*qdisc_replace(struct Qdisc
*sch
, struct Qdisc
*new,
829 unsigned int qlen
= old
->q
.qlen
;
830 unsigned int backlog
= old
->qstats
.backlog
;
833 qdisc_tree_reduce_backlog(old
, qlen
, backlog
);
835 sch_tree_unlock(sch
);
840 static inline void rtnl_qdisc_drop(struct sk_buff
*skb
, struct Qdisc
*sch
)
842 rtnl_kfree_skbs(skb
, skb
);
843 qdisc_qstats_drop(sch
);
847 static inline int qdisc_drop(struct sk_buff
*skb
, struct Qdisc
*sch
,
848 struct sk_buff
**to_free
)
850 __qdisc_drop(skb
, to_free
);
851 qdisc_qstats_drop(sch
);
853 return NET_XMIT_DROP
;
856 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
857 long it will take to send a packet given its size.
859 static inline u32
qdisc_l2t(struct qdisc_rate_table
* rtab
, unsigned int pktlen
)
861 int slot
= pktlen
+ rtab
->rate
.cell_align
+ rtab
->rate
.overhead
;
864 slot
>>= rtab
->rate
.cell_log
;
866 return rtab
->data
[255]*(slot
>> 8) + rtab
->data
[slot
& 0xFF];
867 return rtab
->data
[slot
];
870 struct psched_ratecfg
{
871 u64 rate_bytes_ps
; /* bytes per second */
878 static inline u64
psched_l2t_ns(const struct psched_ratecfg
*r
,
883 if (unlikely(r
->linklayer
== TC_LINKLAYER_ATM
))
884 return ((u64
)(DIV_ROUND_UP(len
,48)*53) * r
->mult
) >> r
->shift
;
886 return ((u64
)len
* r
->mult
) >> r
->shift
;
889 void psched_ratecfg_precompute(struct psched_ratecfg
*r
,
890 const struct tc_ratespec
*conf
,
893 static inline void psched_ratecfg_getrate(struct tc_ratespec
*res
,
894 const struct psched_ratecfg
*r
)
896 memset(res
, 0, sizeof(*res
));
898 /* legacy struct tc_ratespec has a 32bit @rate field
899 * Qdisc using 64bit rate should add new attributes
900 * in order to maintain compatibility.
902 res
->rate
= min_t(u64
, r
->rate_bytes_ps
, ~0U);
904 res
->overhead
= r
->overhead
;
905 res
->linklayer
= (r
->linklayer
& TC_LINKLAYER_MASK
);
908 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
909 * The fast path only needs to access filter list and to update stats
912 struct tcf_proto
*filter_list
;
913 struct gnet_stats_basic_cpu __percpu
*cpu_bstats
;
914 struct gnet_stats_queue __percpu
*cpu_qstats
;
918 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc
*miniq
,
919 const struct sk_buff
*skb
)
921 bstats_cpu_update(this_cpu_ptr(miniq
->cpu_bstats
), skb
);
924 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc
*miniq
)
926 this_cpu_inc(miniq
->cpu_qstats
->drops
);
929 struct mini_Qdisc_pair
{
930 struct mini_Qdisc miniq1
;
931 struct mini_Qdisc miniq2
;
932 struct mini_Qdisc __rcu
**p_miniq
;
935 void mini_qdisc_pair_swap(struct mini_Qdisc_pair
*miniqp
,
936 struct tcf_proto
*tp_head
);
937 void mini_qdisc_pair_init(struct mini_Qdisc_pair
*miniqp
, struct Qdisc
*qdisc
,
938 struct mini_Qdisc __rcu
**p_miniq
);