2 * net/sched/sch_api.c Packet scheduler API.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
13 * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired.
14 * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
15 * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/kernel.h>
21 #include <linux/string.h>
22 #include <linux/errno.h>
23 #include <linux/skbuff.h>
24 #include <linux/init.h>
25 #include <linux/proc_fs.h>
26 #include <linux/seq_file.h>
27 #include <linux/kmod.h>
28 #include <linux/list.h>
29 #include <linux/hrtimer.h>
30 #include <linux/lockdep.h>
31 #include <linux/slab.h>
33 #include <net/net_namespace.h>
35 #include <net/netlink.h>
36 #include <net/pkt_sched.h>
38 static int qdisc_notify(struct net *net, struct sk_buff *oskb,
39 struct nlmsghdr *n, u32 clid,
40 struct Qdisc *old, struct Qdisc *new);
41 static int tclass_notify(struct net *net, struct sk_buff *oskb,
42 struct nlmsghdr *n, struct Qdisc *q,
43 unsigned long cl, int event);
50 This file consists of two interrelated parts:
52 1. queueing disciplines manager frontend.
53 2. traffic classes manager frontend.
55 Generally, queueing discipline ("qdisc") is a black box,
56 which is able to enqueue packets and to dequeue them (when
57 device is ready to send something) in order and at times
58 determined by algorithm hidden in it.
60 qdisc's are divided to two categories:
61 - "queues", which have no internal structure visible from outside.
62 - "schedulers", which split all the packets to "traffic classes",
63 using "packet classifiers" (look at cls_api.c)
65 In turn, classes may have child qdiscs (as rule, queues)
66 attached to them etc. etc. etc.
68 The goal of the routines in this file is to translate
69 information supplied by user in the form of handles
70 to more intelligible for kernel form, to make some sanity
71 checks and part of work, which is common to all qdiscs
72 and to provide rtnetlink notifications.
74 All real intelligent work is done inside qdisc modules.
78 Every discipline has two major routines: enqueue and dequeue.
82 dequeue usually returns a skb to send. It is allowed to return NULL,
83 but it does not mean that queue is empty, it just means that
84 discipline does not want to send anything this time.
85 Queue is really empty if q->q.qlen == 0.
86 For complicated disciplines with multiple queues q->q is not
87 real packet queue, but however q->q.qlen must be valid.
91 enqueue returns 0, if packet was enqueued successfully.
92 If packet (this one or another one) was dropped, it returns
94 NET_XMIT_DROP - this packet dropped
95 Expected action: do not backoff, but wait until queue will clear.
96 NET_XMIT_CN - probably this packet enqueued, but another one dropped.
97 Expected action: backoff or ignore
98 NET_XMIT_POLICED - dropped by police.
99 Expected action: backoff or error to real-time apps.
105 like dequeue but without removing a packet from the queue
109 returns qdisc to initial state: purge all buffers, clear all
110 timers, counters (except for statistics) etc.
114 initializes newly created qdisc.
118 destroys resources allocated by init and during lifetime of qdisc.
122 changes qdisc parameters.
125 /* Protects list of registered TC modules. It is pure SMP lock. */
126 static DEFINE_RWLOCK(qdisc_mod_lock);
129 /************************************************
130 * Queueing disciplines manipulation. *
131 ************************************************/
134 /* The list of all installed queueing disciplines. */
136 static struct Qdisc_ops *qdisc_base;
138 /* Register/uregister queueing discipline */
140 int register_qdisc(struct Qdisc_ops *qops)
142 struct Qdisc_ops *q, **qp;
145 write_lock(&qdisc_mod_lock);
146 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
147 if (!strcmp(qops->id, q->id))
150 if (qops->enqueue == NULL)
151 qops->enqueue = noop_qdisc_ops.enqueue;
152 if (qops->peek == NULL) {
153 if (qops->dequeue == NULL)
154 qops->peek = noop_qdisc_ops.peek;
158 if (qops->dequeue == NULL)
159 qops->dequeue = noop_qdisc_ops.dequeue;
162 const struct Qdisc_class_ops *cops = qops->cl_ops;
164 if (!(cops->get && cops->put && cops->walk && cops->leaf))
167 if (cops->tcf_chain && !(cops->bind_tcf && cops->unbind_tcf))
175 write_unlock(&qdisc_mod_lock);
182 EXPORT_SYMBOL(register_qdisc);
184 int unregister_qdisc(struct Qdisc_ops *qops)
186 struct Qdisc_ops *q, **qp;
189 write_lock(&qdisc_mod_lock);
190 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
198 write_unlock(&qdisc_mod_lock);
201 EXPORT_SYMBOL(unregister_qdisc);
203 /* We know handle. Find qdisc among all qdisc's attached to device
204 (root qdisc, all its children, children of children etc.)
207 static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
211 if (!(root->flags & TCQ_F_BUILTIN) &&
212 root->handle == handle)
215 list_for_each_entry(q, &root->list, list) {
216 if (q->handle == handle)
222 static void qdisc_list_add(struct Qdisc *q)
224 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS))
225 list_add_tail(&q->list, &qdisc_dev(q)->qdisc->list);
228 void qdisc_list_del(struct Qdisc *q)
230 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS))
233 EXPORT_SYMBOL(qdisc_list_del);
235 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
239 q = qdisc_match_from_root(dev->qdisc, handle);
243 if (dev_ingress_queue(dev))
244 q = qdisc_match_from_root(
245 dev_ingress_queue(dev)->qdisc_sleeping,
251 static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
255 const struct Qdisc_class_ops *cops = p->ops->cl_ops;
259 cl = cops->get(p, classid);
263 leaf = cops->leaf(p, cl);
268 /* Find queueing discipline by name */
270 static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind)
272 struct Qdisc_ops *q = NULL;
275 read_lock(&qdisc_mod_lock);
276 for (q = qdisc_base; q; q = q->next) {
277 if (nla_strcmp(kind, q->id) == 0) {
278 if (!try_module_get(q->owner))
283 read_unlock(&qdisc_mod_lock);
288 /* The linklayer setting were not transferred from iproute2, in older
289 * versions, and the rate tables lookup systems have been dropped in
290 * the kernel. To keep backward compatible with older iproute2 tc
291 * utils, we detect the linklayer setting by detecting if the rate
292 * table were modified.
294 * For linklayer ATM table entries, the rate table will be aligned to
295 * 48 bytes, thus some table entries will contain the same value. The
296 * mpu (min packet unit) is also encoded into the old rate table, thus
297 * starting from the mpu, we find low and high table entries for
298 * mapping this cell. If these entries contain the same value, when
299 * the rate tables have been modified for linklayer ATM.
301 * This is done by rounding mpu to the nearest 48 bytes cell/entry,
302 * and then roundup to the next cell, calc the table entry one below,
305 static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab)
307 int low = roundup(r->mpu, 48);
308 int high = roundup(low+1, 48);
309 int cell_low = low >> r->cell_log;
310 int cell_high = (high >> r->cell_log) - 1;
312 /* rtab is too inaccurate at rates > 100Mbit/s */
313 if ((r->rate > (100000000/8)) || (rtab[0] == 0)) {
314 pr_debug("TC linklayer: Giving up ATM detection\n");
315 return TC_LINKLAYER_ETHERNET;
318 if ((cell_high > cell_low) && (cell_high < 256)
319 && (rtab[cell_low] == rtab[cell_high])) {
320 pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n",
321 cell_low, cell_high, rtab[cell_high]);
322 return TC_LINKLAYER_ATM;
324 return TC_LINKLAYER_ETHERNET;
327 static struct qdisc_rate_table *qdisc_rtab_list;
329 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab)
331 struct qdisc_rate_table *rtab;
333 if (tab == NULL || r->rate == 0 || r->cell_log == 0 ||
334 nla_len(tab) != TC_RTAB_SIZE)
337 for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) {
338 if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) &&
339 !memcmp(&rtab->data, nla_data(tab), 1024)) {
345 rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
349 memcpy(rtab->data, nla_data(tab), 1024);
350 if (r->linklayer == TC_LINKLAYER_UNAWARE)
351 r->linklayer = __detect_linklayer(r, rtab->data);
352 rtab->next = qdisc_rtab_list;
353 qdisc_rtab_list = rtab;
357 EXPORT_SYMBOL(qdisc_get_rtab);
359 void qdisc_put_rtab(struct qdisc_rate_table *tab)
361 struct qdisc_rate_table *rtab, **rtabp;
363 if (!tab || --tab->refcnt)
366 for (rtabp = &qdisc_rtab_list;
367 (rtab = *rtabp) != NULL;
368 rtabp = &rtab->next) {
376 EXPORT_SYMBOL(qdisc_put_rtab);
378 static LIST_HEAD(qdisc_stab_list);
379 static DEFINE_SPINLOCK(qdisc_stab_lock);
381 static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = {
382 [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) },
383 [TCA_STAB_DATA] = { .type = NLA_BINARY },
386 static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt)
388 struct nlattr *tb[TCA_STAB_MAX + 1];
389 struct qdisc_size_table *stab;
390 struct tc_sizespec *s;
391 unsigned int tsize = 0;
395 err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy);
398 if (!tb[TCA_STAB_BASE])
399 return ERR_PTR(-EINVAL);
401 s = nla_data(tb[TCA_STAB_BASE]);
404 if (!tb[TCA_STAB_DATA])
405 return ERR_PTR(-EINVAL);
406 tab = nla_data(tb[TCA_STAB_DATA]);
407 tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16);
410 if (tsize != s->tsize || (!tab && tsize > 0))
411 return ERR_PTR(-EINVAL);
413 spin_lock(&qdisc_stab_lock);
415 list_for_each_entry(stab, &qdisc_stab_list, list) {
416 if (memcmp(&stab->szopts, s, sizeof(*s)))
418 if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16)))
421 spin_unlock(&qdisc_stab_lock);
425 spin_unlock(&qdisc_stab_lock);
427 stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL);
429 return ERR_PTR(-ENOMEM);
434 memcpy(stab->data, tab, tsize * sizeof(u16));
436 spin_lock(&qdisc_stab_lock);
437 list_add_tail(&stab->list, &qdisc_stab_list);
438 spin_unlock(&qdisc_stab_lock);
443 static void stab_kfree_rcu(struct rcu_head *head)
445 kfree(container_of(head, struct qdisc_size_table, rcu));
448 void qdisc_put_stab(struct qdisc_size_table *tab)
453 spin_lock(&qdisc_stab_lock);
455 if (--tab->refcnt == 0) {
456 list_del(&tab->list);
457 call_rcu_bh(&tab->rcu, stab_kfree_rcu);
460 spin_unlock(&qdisc_stab_lock);
462 EXPORT_SYMBOL(qdisc_put_stab);
464 static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab)
468 nest = nla_nest_start(skb, TCA_STAB);
470 goto nla_put_failure;
471 if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts))
472 goto nla_put_failure;
473 nla_nest_end(skb, nest);
481 void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab)
485 pkt_len = skb->len + stab->szopts.overhead;
486 if (unlikely(!stab->szopts.tsize))
489 slot = pkt_len + stab->szopts.cell_align;
490 if (unlikely(slot < 0))
493 slot >>= stab->szopts.cell_log;
494 if (likely(slot < stab->szopts.tsize))
495 pkt_len = stab->data[slot];
497 pkt_len = stab->data[stab->szopts.tsize - 1] *
498 (slot / stab->szopts.tsize) +
499 stab->data[slot % stab->szopts.tsize];
501 pkt_len <<= stab->szopts.size_log;
503 if (unlikely(pkt_len < 1))
505 qdisc_skb_cb(skb)->pkt_len = pkt_len;
507 EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
509 void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc)
511 if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
512 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
513 txt, qdisc->ops->id, qdisc->handle >> 16);
514 qdisc->flags |= TCQ_F_WARN_NONWC;
517 EXPORT_SYMBOL(qdisc_warn_nonwc);
519 static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
521 struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
524 qdisc_unthrottled(wd->qdisc);
525 __netif_schedule(qdisc_root(wd->qdisc));
527 return HRTIMER_NORESTART;
530 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
532 hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
533 wd->timer.function = qdisc_watchdog;
536 EXPORT_SYMBOL(qdisc_watchdog_init);
538 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires)
540 if (test_bit(__QDISC_STATE_DEACTIVATED,
541 &qdisc_root_sleeping(wd->qdisc)->state))
544 qdisc_throttled(wd->qdisc);
546 hrtimer_start(&wd->timer,
547 ns_to_ktime(expires),
550 EXPORT_SYMBOL(qdisc_watchdog_schedule_ns);
552 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
554 hrtimer_cancel(&wd->timer);
555 qdisc_unthrottled(wd->qdisc);
557 EXPORT_SYMBOL(qdisc_watchdog_cancel);
559 static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
561 unsigned int size = n * sizeof(struct hlist_head), i;
562 struct hlist_head *h;
564 if (size <= PAGE_SIZE)
565 h = kmalloc(size, GFP_KERNEL);
567 h = (struct hlist_head *)
568 __get_free_pages(GFP_KERNEL, get_order(size));
571 for (i = 0; i < n; i++)
572 INIT_HLIST_HEAD(&h[i]);
577 static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n)
579 unsigned int size = n * sizeof(struct hlist_head);
581 if (size <= PAGE_SIZE)
584 free_pages((unsigned long)h, get_order(size));
587 void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
589 struct Qdisc_class_common *cl;
590 struct hlist_node *next;
591 struct hlist_head *nhash, *ohash;
592 unsigned int nsize, nmask, osize;
595 /* Rehash when load factor exceeds 0.75 */
596 if (clhash->hashelems * 4 <= clhash->hashsize * 3)
598 nsize = clhash->hashsize * 2;
600 nhash = qdisc_class_hash_alloc(nsize);
604 ohash = clhash->hash;
605 osize = clhash->hashsize;
608 for (i = 0; i < osize; i++) {
609 hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) {
610 h = qdisc_class_hash(cl->classid, nmask);
611 hlist_add_head(&cl->hnode, &nhash[h]);
614 clhash->hash = nhash;
615 clhash->hashsize = nsize;
616 clhash->hashmask = nmask;
617 sch_tree_unlock(sch);
619 qdisc_class_hash_free(ohash, osize);
621 EXPORT_SYMBOL(qdisc_class_hash_grow);
623 int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
625 unsigned int size = 4;
627 clhash->hash = qdisc_class_hash_alloc(size);
628 if (clhash->hash == NULL)
630 clhash->hashsize = size;
631 clhash->hashmask = size - 1;
632 clhash->hashelems = 0;
635 EXPORT_SYMBOL(qdisc_class_hash_init);
637 void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
639 qdisc_class_hash_free(clhash->hash, clhash->hashsize);
641 EXPORT_SYMBOL(qdisc_class_hash_destroy);
643 void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash,
644 struct Qdisc_class_common *cl)
648 INIT_HLIST_NODE(&cl->hnode);
649 h = qdisc_class_hash(cl->classid, clhash->hashmask);
650 hlist_add_head(&cl->hnode, &clhash->hash[h]);
653 EXPORT_SYMBOL(qdisc_class_hash_insert);
655 void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash,
656 struct Qdisc_class_common *cl)
658 hlist_del(&cl->hnode);
661 EXPORT_SYMBOL(qdisc_class_hash_remove);
663 /* Allocate an unique handle from space managed by kernel
664 * Possible range is [8000-FFFF]:0000 (0x8000 values)
666 static u32 qdisc_alloc_handle(struct net_device *dev)
669 static u32 autohandle = TC_H_MAKE(0x80000000U, 0);
672 autohandle += TC_H_MAKE(0x10000U, 0);
673 if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
674 autohandle = TC_H_MAKE(0x80000000U, 0);
675 if (!qdisc_lookup(dev, autohandle))
683 void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)
685 const struct Qdisc_class_ops *cops;
691 while ((parentid = sch->parent)) {
692 if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
695 sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
697 WARN_ON(parentid != TC_H_ROOT);
700 cops = sch->ops->cl_ops;
701 if (cops->qlen_notify) {
702 cl = cops->get(sch, parentid);
703 cops->qlen_notify(sch, cl);
709 EXPORT_SYMBOL(qdisc_tree_decrease_qlen);
711 static void notify_and_destroy(struct net *net, struct sk_buff *skb,
712 struct nlmsghdr *n, u32 clid,
713 struct Qdisc *old, struct Qdisc *new)
716 qdisc_notify(net, skb, n, clid, old, new);
722 /* Graft qdisc "new" to class "classid" of qdisc "parent" or
725 * When appropriate send a netlink notification using 'skb'
728 * On success, destroy old qdisc.
731 static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
732 struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
733 struct Qdisc *new, struct Qdisc *old)
735 struct Qdisc *q = old;
736 struct net *net = dev_net(dev);
739 if (parent == NULL) {
740 unsigned int i, num_q, ingress;
743 num_q = dev->num_tx_queues;
744 if ((q && q->flags & TCQ_F_INGRESS) ||
745 (new && new->flags & TCQ_F_INGRESS)) {
748 if (!dev_ingress_queue(dev))
752 if (dev->flags & IFF_UP)
755 if (new && new->ops->attach) {
756 new->ops->attach(new);
760 for (i = 0; i < num_q; i++) {
761 struct netdev_queue *dev_queue = dev_ingress_queue(dev);
764 dev_queue = netdev_get_tx_queue(dev, i);
766 old = dev_graft_qdisc(dev_queue, new);
768 atomic_inc(&new->refcnt);
775 notify_and_destroy(net, skb, n, classid,
777 if (new && !new->ops->attach)
778 atomic_inc(&new->refcnt);
779 dev->qdisc = new ? : &noop_qdisc;
781 notify_and_destroy(net, skb, n, classid, old, new);
784 if (dev->flags & IFF_UP)
787 const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
790 if (cops && cops->graft) {
791 unsigned long cl = cops->get(parent, classid);
793 err = cops->graft(parent, cl, new, &old);
794 cops->put(parent, cl);
799 notify_and_destroy(net, skb, n, classid, old, new);
804 /* lockdep annotation is needed for ingress; egress gets it only for name */
805 static struct lock_class_key qdisc_tx_lock;
806 static struct lock_class_key qdisc_rx_lock;
809 Allocate and initialize new qdisc.
811 Parameters are passed via opt.
814 static struct Qdisc *
815 qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
816 struct Qdisc *p, u32 parent, u32 handle,
817 struct nlattr **tca, int *errp)
820 struct nlattr *kind = tca[TCA_KIND];
822 struct Qdisc_ops *ops;
823 struct qdisc_size_table *stab;
825 ops = qdisc_lookup_ops(kind);
826 #ifdef CONFIG_MODULES
827 if (ops == NULL && kind != NULL) {
829 if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
830 /* We dropped the RTNL semaphore in order to
831 * perform the module load. So, even if we
832 * succeeded in loading the module we have to
833 * tell the caller to replay the request. We
834 * indicate this using -EAGAIN.
835 * We replay the request because the device may
836 * go away in the mean time.
839 request_module("sch_%s", name);
841 ops = qdisc_lookup_ops(kind);
843 /* We will try again qdisc_lookup_ops,
844 * so don't keep a reference.
846 module_put(ops->owner);
858 sch = qdisc_alloc(dev_queue, ops);
864 sch->parent = parent;
866 if (handle == TC_H_INGRESS) {
867 sch->flags |= TCQ_F_INGRESS;
868 handle = TC_H_MAKE(TC_H_INGRESS, 0);
869 lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock);
872 handle = qdisc_alloc_handle(dev);
877 lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock);
878 if (!netif_is_multiqueue(dev))
879 sch->flags |= TCQ_F_ONETXQUEUE;
882 sch->handle = handle;
884 if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) {
886 stab = qdisc_get_stab(tca[TCA_STAB]);
891 rcu_assign_pointer(sch->stab, stab);
894 spinlock_t *root_lock;
897 if (sch->flags & TCQ_F_MQROOT)
900 if ((sch->parent != TC_H_ROOT) &&
901 !(sch->flags & TCQ_F_INGRESS) &&
902 (!p || !(p->flags & TCQ_F_MQROOT)))
903 root_lock = qdisc_root_sleeping_lock(sch);
905 root_lock = qdisc_lock(sch);
907 err = gen_new_estimator(&sch->bstats, &sch->rate_est,
908 root_lock, tca[TCA_RATE]);
919 kfree((char *) sch - sch->padded);
921 module_put(ops->owner);
928 * Any broken qdiscs that would require a ops->reset() here?
929 * The qdisc was never in action so it shouldn't be necessary.
931 qdisc_put_stab(rtnl_dereference(sch->stab));
937 static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
939 struct qdisc_size_table *ostab, *stab = NULL;
942 if (tca[TCA_OPTIONS]) {
943 if (sch->ops->change == NULL)
945 err = sch->ops->change(sch, tca[TCA_OPTIONS]);
951 stab = qdisc_get_stab(tca[TCA_STAB]);
953 return PTR_ERR(stab);
956 ostab = rtnl_dereference(sch->stab);
957 rcu_assign_pointer(sch->stab, stab);
958 qdisc_put_stab(ostab);
961 /* NB: ignores errors from replace_estimator
962 because change can't be undone. */
963 if (sch->flags & TCQ_F_MQROOT)
965 gen_replace_estimator(&sch->bstats, &sch->rate_est,
966 qdisc_root_sleeping_lock(sch),
973 struct check_loop_arg {
974 struct qdisc_walker w;
979 static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w);
981 static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
983 struct check_loop_arg arg;
985 if (q->ops->cl_ops == NULL)
988 arg.w.stop = arg.w.skip = arg.w.count = 0;
989 arg.w.fn = check_loop_fn;
992 q->ops->cl_ops->walk(q, &arg.w);
993 return arg.w.stop ? -ELOOP : 0;
997 check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
1000 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1001 struct check_loop_arg *arg = (struct check_loop_arg *)w;
1003 leaf = cops->leaf(q, cl);
1005 if (leaf == arg->p || arg->depth > 7)
1007 return check_loop(leaf, arg->p, arg->depth + 1);
1016 static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
1018 struct net *net = sock_net(skb->sk);
1019 struct tcmsg *tcm = nlmsg_data(n);
1020 struct nlattr *tca[TCA_MAX + 1];
1021 struct net_device *dev;
1023 struct Qdisc *q = NULL;
1024 struct Qdisc *p = NULL;
1027 if ((n->nlmsg_type != RTM_GETQDISC) && !capable(CAP_NET_ADMIN))
1030 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1034 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1038 clid = tcm->tcm_parent;
1040 if (clid != TC_H_ROOT) {
1041 if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
1042 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1045 q = qdisc_leaf(p, clid);
1046 } else if (dev_ingress_queue(dev)) {
1047 q = dev_ingress_queue(dev)->qdisc_sleeping;
1055 if (tcm->tcm_handle && q->handle != tcm->tcm_handle)
1058 q = qdisc_lookup(dev, tcm->tcm_handle);
1063 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1066 if (n->nlmsg_type == RTM_DELQDISC) {
1071 err = qdisc_graft(dev, p, skb, n, clid, NULL, q);
1075 qdisc_notify(net, skb, n, clid, NULL, q);
1081 * Create/change qdisc.
1084 static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
1086 struct net *net = sock_net(skb->sk);
1088 struct nlattr *tca[TCA_MAX + 1];
1089 struct net_device *dev;
1091 struct Qdisc *q, *p;
1094 if (!capable(CAP_NET_ADMIN))
1098 /* Reinit, just in case something touches this. */
1099 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1103 tcm = nlmsg_data(n);
1104 clid = tcm->tcm_parent;
1107 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1113 if (clid != TC_H_ROOT) {
1114 if (clid != TC_H_INGRESS) {
1115 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1118 q = qdisc_leaf(p, clid);
1119 } else if (dev_ingress_queue_create(dev)) {
1120 q = dev_ingress_queue(dev)->qdisc_sleeping;
1126 /* It may be default qdisc, ignore it */
1127 if (q && q->handle == 0)
1130 if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
1131 if (tcm->tcm_handle) {
1132 if (q && !(n->nlmsg_flags & NLM_F_REPLACE))
1134 if (TC_H_MIN(tcm->tcm_handle))
1136 q = qdisc_lookup(dev, tcm->tcm_handle);
1138 goto create_n_graft;
1139 if (n->nlmsg_flags & NLM_F_EXCL)
1141 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1144 (p && check_loop(q, p, 0)))
1146 atomic_inc(&q->refcnt);
1150 goto create_n_graft;
1152 /* This magic test requires explanation.
1154 * We know, that some child q is already
1155 * attached to this parent and have choice:
1156 * either to change it or to create/graft new one.
1158 * 1. We are allowed to create/graft only
1159 * if CREATE and REPLACE flags are set.
1161 * 2. If EXCL is set, requestor wanted to say,
1162 * that qdisc tcm_handle is not expected
1163 * to exist, so that we choose create/graft too.
1165 * 3. The last case is when no flags are set.
1166 * Alas, it is sort of hole in API, we
1167 * cannot decide what to do unambiguously.
1168 * For now we select create/graft, if
1169 * user gave KIND, which does not match existing.
1171 if ((n->nlmsg_flags & NLM_F_CREATE) &&
1172 (n->nlmsg_flags & NLM_F_REPLACE) &&
1173 ((n->nlmsg_flags & NLM_F_EXCL) ||
1175 nla_strcmp(tca[TCA_KIND], q->ops->id))))
1176 goto create_n_graft;
1180 if (!tcm->tcm_handle)
1182 q = qdisc_lookup(dev, tcm->tcm_handle);
1185 /* Change qdisc parameters */
1188 if (n->nlmsg_flags & NLM_F_EXCL)
1190 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1192 err = qdisc_change(q, tca);
1194 qdisc_notify(net, skb, n, clid, NULL, q);
1198 if (!(n->nlmsg_flags & NLM_F_CREATE))
1200 if (clid == TC_H_INGRESS) {
1201 if (dev_ingress_queue(dev))
1202 q = qdisc_create(dev, dev_ingress_queue(dev), p,
1203 tcm->tcm_parent, tcm->tcm_parent,
1208 struct netdev_queue *dev_queue;
1210 if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
1211 dev_queue = p->ops->cl_ops->select_queue(p, tcm);
1213 dev_queue = p->dev_queue;
1215 dev_queue = netdev_get_tx_queue(dev, 0);
1217 q = qdisc_create(dev, dev_queue, p,
1218 tcm->tcm_parent, tcm->tcm_handle,
1228 err = qdisc_graft(dev, p, skb, n, clid, q, NULL);
1238 static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
1239 u32 portid, u32 seq, u16 flags, int event)
1242 struct nlmsghdr *nlh;
1243 unsigned char *b = skb_tail_pointer(skb);
1245 struct qdisc_size_table *stab;
1247 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1249 goto out_nlmsg_trim;
1250 tcm = nlmsg_data(nlh);
1251 tcm->tcm_family = AF_UNSPEC;
1254 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1255 tcm->tcm_parent = clid;
1256 tcm->tcm_handle = q->handle;
1257 tcm->tcm_info = atomic_read(&q->refcnt);
1258 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1259 goto nla_put_failure;
1260 if (q->ops->dump && q->ops->dump(q, skb) < 0)
1261 goto nla_put_failure;
1262 q->qstats.qlen = q->q.qlen;
1264 stab = rtnl_dereference(q->stab);
1265 if (stab && qdisc_dump_stab(skb, stab) < 0)
1266 goto nla_put_failure;
1268 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1269 qdisc_root_sleeping_lock(q), &d) < 0)
1270 goto nla_put_failure;
1272 if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
1273 goto nla_put_failure;
1275 if (gnet_stats_copy_basic(&d, &q->bstats) < 0 ||
1276 gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 ||
1277 gnet_stats_copy_queue(&d, &q->qstats) < 0)
1278 goto nla_put_failure;
1280 if (gnet_stats_finish_copy(&d) < 0)
1281 goto nla_put_failure;
1283 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1292 static bool tc_qdisc_dump_ignore(struct Qdisc *q)
1294 return (q->flags & TCQ_F_BUILTIN) ? true : false;
1297 static int qdisc_notify(struct net *net, struct sk_buff *oskb,
1298 struct nlmsghdr *n, u32 clid,
1299 struct Qdisc *old, struct Qdisc *new)
1301 struct sk_buff *skb;
1302 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1304 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1308 if (old && !tc_qdisc_dump_ignore(old)) {
1309 if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq,
1310 0, RTM_DELQDISC) < 0)
1313 if (new && !tc_qdisc_dump_ignore(new)) {
1314 if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq,
1315 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
1320 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1321 n->nlmsg_flags & NLM_F_ECHO);
1328 static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
1329 struct netlink_callback *cb,
1330 int *q_idx_p, int s_q_idx)
1332 int ret = 0, q_idx = *q_idx_p;
1339 if (q_idx < s_q_idx) {
1342 if (!tc_qdisc_dump_ignore(q) &&
1343 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1344 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1348 list_for_each_entry(q, &root->list, list) {
1349 if (q_idx < s_q_idx) {
1353 if (!tc_qdisc_dump_ignore(q) &&
1354 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1355 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1368 static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
1370 struct net *net = sock_net(skb->sk);
1373 struct net_device *dev;
1375 s_idx = cb->args[0];
1376 s_q_idx = q_idx = cb->args[1];
1380 for_each_netdev_rcu(net, dev) {
1381 struct netdev_queue *dev_queue;
1389 if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0)
1392 dev_queue = dev_ingress_queue(dev);
1394 tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
1395 &q_idx, s_q_idx) < 0)
1406 cb->args[1] = q_idx;
1413 /************************************************
1414 * Traffic classes manipulation. *
1415 ************************************************/
1419 static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n)
1421 struct net *net = sock_net(skb->sk);
1422 struct tcmsg *tcm = nlmsg_data(n);
1423 struct nlattr *tca[TCA_MAX + 1];
1424 struct net_device *dev;
1425 struct Qdisc *q = NULL;
1426 const struct Qdisc_class_ops *cops;
1427 unsigned long cl = 0;
1428 unsigned long new_cl;
1434 if ((n->nlmsg_type != RTM_GETTCLASS) && !capable(CAP_NET_ADMIN))
1437 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1441 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1446 parent == TC_H_UNSPEC - unspecified parent.
1447 parent == TC_H_ROOT - class is root, which has no parent.
1448 parent == X:0 - parent is root class.
1449 parent == X:Y - parent is a node in hierarchy.
1450 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1452 handle == 0:0 - generate handle from kernel pool.
1453 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1454 handle == X:Y - clear.
1455 handle == X:0 - root class.
1458 /* Step 1. Determine qdisc handle X:0 */
1460 portid = tcm->tcm_parent;
1461 clid = tcm->tcm_handle;
1462 qid = TC_H_MAJ(clid);
1464 if (portid != TC_H_ROOT) {
1465 u32 qid1 = TC_H_MAJ(portid);
1468 /* If both majors are known, they must be identical. */
1473 } else if (qid == 0)
1474 qid = dev->qdisc->handle;
1476 /* Now qid is genuine qdisc handle consistent
1477 * both with parent and child.
1479 * TC_H_MAJ(portid) still may be unspecified, complete it now.
1482 portid = TC_H_MAKE(qid, portid);
1485 qid = dev->qdisc->handle;
1488 /* OK. Locate qdisc */
1489 q = qdisc_lookup(dev, qid);
1493 /* An check that it supports classes */
1494 cops = q->ops->cl_ops;
1498 /* Now try to get class */
1500 if (portid == TC_H_ROOT)
1503 clid = TC_H_MAKE(qid, clid);
1506 cl = cops->get(q, clid);
1510 if (n->nlmsg_type != RTM_NEWTCLASS ||
1511 !(n->nlmsg_flags & NLM_F_CREATE))
1514 switch (n->nlmsg_type) {
1517 if (n->nlmsg_flags & NLM_F_EXCL)
1523 err = cops->delete(q, cl);
1525 tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS);
1528 err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
1539 err = cops->change(q, clid, portid, tca, &new_cl);
1541 tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
1551 static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
1553 u32 portid, u32 seq, u16 flags, int event)
1556 struct nlmsghdr *nlh;
1557 unsigned char *b = skb_tail_pointer(skb);
1559 const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
1561 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1563 goto out_nlmsg_trim;
1564 tcm = nlmsg_data(nlh);
1565 tcm->tcm_family = AF_UNSPEC;
1568 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1569 tcm->tcm_parent = q->handle;
1570 tcm->tcm_handle = q->handle;
1572 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1573 goto nla_put_failure;
1574 if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
1575 goto nla_put_failure;
1577 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1578 qdisc_root_sleeping_lock(q), &d) < 0)
1579 goto nla_put_failure;
1581 if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
1582 goto nla_put_failure;
1584 if (gnet_stats_finish_copy(&d) < 0)
1585 goto nla_put_failure;
1587 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1596 static int tclass_notify(struct net *net, struct sk_buff *oskb,
1597 struct nlmsghdr *n, struct Qdisc *q,
1598 unsigned long cl, int event)
1600 struct sk_buff *skb;
1601 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1603 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1607 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) {
1612 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1613 n->nlmsg_flags & NLM_F_ECHO);
1616 struct qdisc_dump_args {
1617 struct qdisc_walker w;
1618 struct sk_buff *skb;
1619 struct netlink_callback *cb;
1622 static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg)
1624 struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
1626 return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid,
1627 a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS);
1630 static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
1631 struct tcmsg *tcm, struct netlink_callback *cb,
1634 struct qdisc_dump_args arg;
1636 if (tc_qdisc_dump_ignore(q) ||
1637 *t_p < s_t || !q->ops->cl_ops ||
1639 TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
1644 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
1645 arg.w.fn = qdisc_class_dump;
1649 arg.w.skip = cb->args[1];
1651 q->ops->cl_ops->walk(q, &arg.w);
1652 cb->args[1] = arg.w.count;
1659 static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
1660 struct tcmsg *tcm, struct netlink_callback *cb,
1668 if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
1671 list_for_each_entry(q, &root->list, list) {
1672 if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
1679 static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
1681 struct tcmsg *tcm = nlmsg_data(cb->nlh);
1682 struct net *net = sock_net(skb->sk);
1683 struct netdev_queue *dev_queue;
1684 struct net_device *dev;
1687 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
1689 dev = dev_get_by_index(net, tcm->tcm_ifindex);
1696 if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
1699 dev_queue = dev_ingress_queue(dev);
1701 tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
1712 /* Main classifier routine: scans classifier chain attached
1713 * to this qdisc, (optionally) tests for protocol and asks
1714 * specific classifiers.
1716 int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
1717 struct tcf_result *res)
1719 __be16 protocol = skb->protocol;
1722 for (; tp; tp = tp->next) {
1723 if (tp->protocol != protocol &&
1724 tp->protocol != htons(ETH_P_ALL))
1726 err = tp->classify(skb, tp, res);
1729 #ifdef CONFIG_NET_CLS_ACT
1730 if (err != TC_ACT_RECLASSIFY && skb->tc_verd)
1731 skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0);
1738 EXPORT_SYMBOL(tc_classify_compat);
1740 int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
1741 struct tcf_result *res)
1744 #ifdef CONFIG_NET_CLS_ACT
1745 const struct tcf_proto *otp = tp;
1749 err = tc_classify_compat(skb, tp, res);
1750 #ifdef CONFIG_NET_CLS_ACT
1751 if (err == TC_ACT_RECLASSIFY) {
1752 u32 verd = G_TC_VERD(skb->tc_verd);
1755 if (verd++ >= MAX_REC_LOOP) {
1756 net_notice_ratelimited("%s: packet reclassify loop rule prio %u protocol %02x\n",
1759 ntohs(tp->protocol));
1762 skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd);
1768 EXPORT_SYMBOL(tc_classify);
1770 void tcf_destroy(struct tcf_proto *tp)
1772 tp->ops->destroy(tp);
1773 module_put(tp->ops->owner);
1777 void tcf_destroy_chain(struct tcf_proto **fl)
1779 struct tcf_proto *tp;
1781 while ((tp = *fl) != NULL) {
1786 EXPORT_SYMBOL(tcf_destroy_chain);
1788 #ifdef CONFIG_PROC_FS
1789 static int psched_show(struct seq_file *seq, void *v)
1793 hrtimer_get_res(CLOCK_MONOTONIC, &ts);
1794 seq_printf(seq, "%08x %08x %08x %08x\n",
1795 (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
1797 (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts)));
1802 static int psched_open(struct inode *inode, struct file *file)
1804 return single_open(file, psched_show, NULL);
1807 static const struct file_operations psched_fops = {
1808 .owner = THIS_MODULE,
1809 .open = psched_open,
1811 .llseek = seq_lseek,
1812 .release = single_release,
1815 static int __net_init psched_net_init(struct net *net)
1817 struct proc_dir_entry *e;
1819 e = proc_create("psched", 0, net->proc_net, &psched_fops);
1826 static void __net_exit psched_net_exit(struct net *net)
1828 remove_proc_entry("psched", net->proc_net);
1831 static int __net_init psched_net_init(struct net *net)
1836 static void __net_exit psched_net_exit(struct net *net)
1841 static struct pernet_operations psched_net_ops = {
1842 .init = psched_net_init,
1843 .exit = psched_net_exit,
1846 static int __init pktsched_init(void)
1850 err = register_pernet_subsys(&psched_net_ops);
1852 pr_err("pktsched_init: "
1853 "cannot initialize per netns operations\n");
1857 register_qdisc(&pfifo_qdisc_ops);
1858 register_qdisc(&bfifo_qdisc_ops);
1859 register_qdisc(&pfifo_head_drop_qdisc_ops);
1860 register_qdisc(&mq_qdisc_ops);
1862 rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL);
1863 rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL);
1864 rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL);
1865 rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL);
1866 rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL);
1867 rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL);
1872 subsys_initcall(pktsched_init);