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)
758 for (i = 0; i < num_q; i++) {
759 struct netdev_queue *dev_queue = dev_ingress_queue(dev);
762 dev_queue = netdev_get_tx_queue(dev, i);
764 old = dev_graft_qdisc(dev_queue, new);
766 atomic_inc(&new->refcnt);
774 notify_and_destroy(net, skb, n, classid,
776 if (new && !new->ops->attach)
777 atomic_inc(&new->refcnt);
778 dev->qdisc = new ? : &noop_qdisc;
780 if (new && new->ops->attach)
781 new->ops->attach(new);
783 notify_and_destroy(net, skb, n, classid, old, new);
786 if (dev->flags & IFF_UP)
789 const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
792 if (cops && cops->graft) {
793 unsigned long cl = cops->get(parent, classid);
795 err = cops->graft(parent, cl, new, &old);
796 cops->put(parent, cl);
801 notify_and_destroy(net, skb, n, classid, old, new);
806 /* lockdep annotation is needed for ingress; egress gets it only for name */
807 static struct lock_class_key qdisc_tx_lock;
808 static struct lock_class_key qdisc_rx_lock;
811 Allocate and initialize new qdisc.
813 Parameters are passed via opt.
816 static struct Qdisc *
817 qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
818 struct Qdisc *p, u32 parent, u32 handle,
819 struct nlattr **tca, int *errp)
822 struct nlattr *kind = tca[TCA_KIND];
824 struct Qdisc_ops *ops;
825 struct qdisc_size_table *stab;
827 ops = qdisc_lookup_ops(kind);
828 #ifdef CONFIG_MODULES
829 if (ops == NULL && kind != NULL) {
831 if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
832 /* We dropped the RTNL semaphore in order to
833 * perform the module load. So, even if we
834 * succeeded in loading the module we have to
835 * tell the caller to replay the request. We
836 * indicate this using -EAGAIN.
837 * We replay the request because the device may
838 * go away in the mean time.
841 request_module("sch_%s", name);
843 ops = qdisc_lookup_ops(kind);
845 /* We will try again qdisc_lookup_ops,
846 * so don't keep a reference.
848 module_put(ops->owner);
860 sch = qdisc_alloc(dev_queue, ops);
866 sch->parent = parent;
868 if (handle == TC_H_INGRESS) {
869 sch->flags |= TCQ_F_INGRESS;
870 handle = TC_H_MAKE(TC_H_INGRESS, 0);
871 lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock);
874 handle = qdisc_alloc_handle(dev);
879 lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock);
880 if (!netif_is_multiqueue(dev))
881 sch->flags |= TCQ_F_ONETXQUEUE;
884 sch->handle = handle;
886 if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) {
888 stab = qdisc_get_stab(tca[TCA_STAB]);
893 rcu_assign_pointer(sch->stab, stab);
896 spinlock_t *root_lock;
899 if (sch->flags & TCQ_F_MQROOT)
902 if ((sch->parent != TC_H_ROOT) &&
903 !(sch->flags & TCQ_F_INGRESS) &&
904 (!p || !(p->flags & TCQ_F_MQROOT)))
905 root_lock = qdisc_root_sleeping_lock(sch);
907 root_lock = qdisc_lock(sch);
909 err = gen_new_estimator(&sch->bstats, &sch->rate_est,
910 root_lock, tca[TCA_RATE]);
921 kfree((char *) sch - sch->padded);
923 module_put(ops->owner);
930 * Any broken qdiscs that would require a ops->reset() here?
931 * The qdisc was never in action so it shouldn't be necessary.
933 qdisc_put_stab(rtnl_dereference(sch->stab));
939 static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
941 struct qdisc_size_table *ostab, *stab = NULL;
944 if (tca[TCA_OPTIONS]) {
945 if (sch->ops->change == NULL)
947 err = sch->ops->change(sch, tca[TCA_OPTIONS]);
953 stab = qdisc_get_stab(tca[TCA_STAB]);
955 return PTR_ERR(stab);
958 ostab = rtnl_dereference(sch->stab);
959 rcu_assign_pointer(sch->stab, stab);
960 qdisc_put_stab(ostab);
963 /* NB: ignores errors from replace_estimator
964 because change can't be undone. */
965 if (sch->flags & TCQ_F_MQROOT)
967 gen_replace_estimator(&sch->bstats, &sch->rate_est,
968 qdisc_root_sleeping_lock(sch),
975 struct check_loop_arg {
976 struct qdisc_walker w;
981 static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w);
983 static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
985 struct check_loop_arg arg;
987 if (q->ops->cl_ops == NULL)
990 arg.w.stop = arg.w.skip = arg.w.count = 0;
991 arg.w.fn = check_loop_fn;
994 q->ops->cl_ops->walk(q, &arg.w);
995 return arg.w.stop ? -ELOOP : 0;
999 check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
1002 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1003 struct check_loop_arg *arg = (struct check_loop_arg *)w;
1005 leaf = cops->leaf(q, cl);
1007 if (leaf == arg->p || arg->depth > 7)
1009 return check_loop(leaf, arg->p, arg->depth + 1);
1018 static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
1020 struct net *net = sock_net(skb->sk);
1021 struct tcmsg *tcm = nlmsg_data(n);
1022 struct nlattr *tca[TCA_MAX + 1];
1023 struct net_device *dev;
1025 struct Qdisc *q = NULL;
1026 struct Qdisc *p = NULL;
1029 if ((n->nlmsg_type != RTM_GETQDISC) && !netlink_capable(skb, CAP_NET_ADMIN))
1032 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1036 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1040 clid = tcm->tcm_parent;
1042 if (clid != TC_H_ROOT) {
1043 if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
1044 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1047 q = qdisc_leaf(p, clid);
1048 } else if (dev_ingress_queue(dev)) {
1049 q = dev_ingress_queue(dev)->qdisc_sleeping;
1057 if (tcm->tcm_handle && q->handle != tcm->tcm_handle)
1060 q = qdisc_lookup(dev, tcm->tcm_handle);
1065 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1068 if (n->nlmsg_type == RTM_DELQDISC) {
1073 err = qdisc_graft(dev, p, skb, n, clid, NULL, q);
1077 qdisc_notify(net, skb, n, clid, NULL, q);
1083 * Create/change qdisc.
1086 static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
1088 struct net *net = sock_net(skb->sk);
1090 struct nlattr *tca[TCA_MAX + 1];
1091 struct net_device *dev;
1093 struct Qdisc *q, *p;
1096 if (!netlink_capable(skb, CAP_NET_ADMIN))
1100 /* Reinit, just in case something touches this. */
1101 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1105 tcm = nlmsg_data(n);
1106 clid = tcm->tcm_parent;
1109 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1115 if (clid != TC_H_ROOT) {
1116 if (clid != TC_H_INGRESS) {
1117 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1120 q = qdisc_leaf(p, clid);
1121 } else if (dev_ingress_queue_create(dev)) {
1122 q = dev_ingress_queue(dev)->qdisc_sleeping;
1128 /* It may be default qdisc, ignore it */
1129 if (q && q->handle == 0)
1132 if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
1133 if (tcm->tcm_handle) {
1134 if (q && !(n->nlmsg_flags & NLM_F_REPLACE))
1136 if (TC_H_MIN(tcm->tcm_handle))
1138 q = qdisc_lookup(dev, tcm->tcm_handle);
1140 goto create_n_graft;
1141 if (n->nlmsg_flags & NLM_F_EXCL)
1143 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1146 (p && check_loop(q, p, 0)))
1148 atomic_inc(&q->refcnt);
1152 goto create_n_graft;
1154 /* This magic test requires explanation.
1156 * We know, that some child q is already
1157 * attached to this parent and have choice:
1158 * either to change it or to create/graft new one.
1160 * 1. We are allowed to create/graft only
1161 * if CREATE and REPLACE flags are set.
1163 * 2. If EXCL is set, requestor wanted to say,
1164 * that qdisc tcm_handle is not expected
1165 * to exist, so that we choose create/graft too.
1167 * 3. The last case is when no flags are set.
1168 * Alas, it is sort of hole in API, we
1169 * cannot decide what to do unambiguously.
1170 * For now we select create/graft, if
1171 * user gave KIND, which does not match existing.
1173 if ((n->nlmsg_flags & NLM_F_CREATE) &&
1174 (n->nlmsg_flags & NLM_F_REPLACE) &&
1175 ((n->nlmsg_flags & NLM_F_EXCL) ||
1177 nla_strcmp(tca[TCA_KIND], q->ops->id))))
1178 goto create_n_graft;
1182 if (!tcm->tcm_handle)
1184 q = qdisc_lookup(dev, tcm->tcm_handle);
1187 /* Change qdisc parameters */
1190 if (n->nlmsg_flags & NLM_F_EXCL)
1192 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1194 err = qdisc_change(q, tca);
1196 qdisc_notify(net, skb, n, clid, NULL, q);
1200 if (!(n->nlmsg_flags & NLM_F_CREATE))
1202 if (clid == TC_H_INGRESS) {
1203 if (dev_ingress_queue(dev))
1204 q = qdisc_create(dev, dev_ingress_queue(dev), p,
1205 tcm->tcm_parent, tcm->tcm_parent,
1210 struct netdev_queue *dev_queue;
1212 if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
1213 dev_queue = p->ops->cl_ops->select_queue(p, tcm);
1215 dev_queue = p->dev_queue;
1217 dev_queue = netdev_get_tx_queue(dev, 0);
1219 q = qdisc_create(dev, dev_queue, p,
1220 tcm->tcm_parent, tcm->tcm_handle,
1230 err = qdisc_graft(dev, p, skb, n, clid, q, NULL);
1240 static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
1241 u32 portid, u32 seq, u16 flags, int event)
1244 struct nlmsghdr *nlh;
1245 unsigned char *b = skb_tail_pointer(skb);
1247 struct qdisc_size_table *stab;
1249 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1251 goto out_nlmsg_trim;
1252 tcm = nlmsg_data(nlh);
1253 tcm->tcm_family = AF_UNSPEC;
1256 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1257 tcm->tcm_parent = clid;
1258 tcm->tcm_handle = q->handle;
1259 tcm->tcm_info = atomic_read(&q->refcnt);
1260 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1261 goto nla_put_failure;
1262 if (q->ops->dump && q->ops->dump(q, skb) < 0)
1263 goto nla_put_failure;
1264 q->qstats.qlen = q->q.qlen;
1266 stab = rtnl_dereference(q->stab);
1267 if (stab && qdisc_dump_stab(skb, stab) < 0)
1268 goto nla_put_failure;
1270 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1271 qdisc_root_sleeping_lock(q), &d) < 0)
1272 goto nla_put_failure;
1274 if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
1275 goto nla_put_failure;
1277 if (gnet_stats_copy_basic(&d, &q->bstats) < 0 ||
1278 gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 ||
1279 gnet_stats_copy_queue(&d, &q->qstats) < 0)
1280 goto nla_put_failure;
1282 if (gnet_stats_finish_copy(&d) < 0)
1283 goto nla_put_failure;
1285 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1294 static bool tc_qdisc_dump_ignore(struct Qdisc *q)
1296 return (q->flags & TCQ_F_BUILTIN) ? true : false;
1299 static int qdisc_notify(struct net *net, struct sk_buff *oskb,
1300 struct nlmsghdr *n, u32 clid,
1301 struct Qdisc *old, struct Qdisc *new)
1303 struct sk_buff *skb;
1304 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1306 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1310 if (old && !tc_qdisc_dump_ignore(old)) {
1311 if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq,
1312 0, RTM_DELQDISC) < 0)
1315 if (new && !tc_qdisc_dump_ignore(new)) {
1316 if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq,
1317 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
1322 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1323 n->nlmsg_flags & NLM_F_ECHO);
1330 static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
1331 struct netlink_callback *cb,
1332 int *q_idx_p, int s_q_idx)
1334 int ret = 0, q_idx = *q_idx_p;
1341 if (q_idx < s_q_idx) {
1344 if (!tc_qdisc_dump_ignore(q) &&
1345 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1346 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1350 list_for_each_entry(q, &root->list, list) {
1351 if (q_idx < s_q_idx) {
1355 if (!tc_qdisc_dump_ignore(q) &&
1356 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1357 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1370 static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
1372 struct net *net = sock_net(skb->sk);
1375 struct net_device *dev;
1377 s_idx = cb->args[0];
1378 s_q_idx = q_idx = cb->args[1];
1382 for_each_netdev_rcu(net, dev) {
1383 struct netdev_queue *dev_queue;
1391 if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0)
1394 dev_queue = dev_ingress_queue(dev);
1396 tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
1397 &q_idx, s_q_idx) < 0)
1408 cb->args[1] = q_idx;
1415 /************************************************
1416 * Traffic classes manipulation. *
1417 ************************************************/
1421 static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n)
1423 struct net *net = sock_net(skb->sk);
1424 struct tcmsg *tcm = nlmsg_data(n);
1425 struct nlattr *tca[TCA_MAX + 1];
1426 struct net_device *dev;
1427 struct Qdisc *q = NULL;
1428 const struct Qdisc_class_ops *cops;
1429 unsigned long cl = 0;
1430 unsigned long new_cl;
1436 if ((n->nlmsg_type != RTM_GETTCLASS) && !netlink_capable(skb, CAP_NET_ADMIN))
1439 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1443 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1448 parent == TC_H_UNSPEC - unspecified parent.
1449 parent == TC_H_ROOT - class is root, which has no parent.
1450 parent == X:0 - parent is root class.
1451 parent == X:Y - parent is a node in hierarchy.
1452 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1454 handle == 0:0 - generate handle from kernel pool.
1455 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1456 handle == X:Y - clear.
1457 handle == X:0 - root class.
1460 /* Step 1. Determine qdisc handle X:0 */
1462 portid = tcm->tcm_parent;
1463 clid = tcm->tcm_handle;
1464 qid = TC_H_MAJ(clid);
1466 if (portid != TC_H_ROOT) {
1467 u32 qid1 = TC_H_MAJ(portid);
1470 /* If both majors are known, they must be identical. */
1475 } else if (qid == 0)
1476 qid = dev->qdisc->handle;
1478 /* Now qid is genuine qdisc handle consistent
1479 * both with parent and child.
1481 * TC_H_MAJ(portid) still may be unspecified, complete it now.
1484 portid = TC_H_MAKE(qid, portid);
1487 qid = dev->qdisc->handle;
1490 /* OK. Locate qdisc */
1491 q = qdisc_lookup(dev, qid);
1495 /* An check that it supports classes */
1496 cops = q->ops->cl_ops;
1500 /* Now try to get class */
1502 if (portid == TC_H_ROOT)
1505 clid = TC_H_MAKE(qid, clid);
1508 cl = cops->get(q, clid);
1512 if (n->nlmsg_type != RTM_NEWTCLASS ||
1513 !(n->nlmsg_flags & NLM_F_CREATE))
1516 switch (n->nlmsg_type) {
1519 if (n->nlmsg_flags & NLM_F_EXCL)
1525 err = cops->delete(q, cl);
1527 tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS);
1530 err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
1541 err = cops->change(q, clid, portid, tca, &new_cl);
1543 tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
1553 static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
1555 u32 portid, u32 seq, u16 flags, int event)
1558 struct nlmsghdr *nlh;
1559 unsigned char *b = skb_tail_pointer(skb);
1561 const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
1563 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1565 goto out_nlmsg_trim;
1566 tcm = nlmsg_data(nlh);
1567 tcm->tcm_family = AF_UNSPEC;
1570 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1571 tcm->tcm_parent = q->handle;
1572 tcm->tcm_handle = q->handle;
1574 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1575 goto nla_put_failure;
1576 if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
1577 goto nla_put_failure;
1579 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1580 qdisc_root_sleeping_lock(q), &d) < 0)
1581 goto nla_put_failure;
1583 if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
1584 goto nla_put_failure;
1586 if (gnet_stats_finish_copy(&d) < 0)
1587 goto nla_put_failure;
1589 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1598 static int tclass_notify(struct net *net, struct sk_buff *oskb,
1599 struct nlmsghdr *n, struct Qdisc *q,
1600 unsigned long cl, int event)
1602 struct sk_buff *skb;
1603 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1605 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1609 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) {
1614 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1615 n->nlmsg_flags & NLM_F_ECHO);
1618 struct qdisc_dump_args {
1619 struct qdisc_walker w;
1620 struct sk_buff *skb;
1621 struct netlink_callback *cb;
1624 static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg)
1626 struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
1628 return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid,
1629 a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS);
1632 static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
1633 struct tcmsg *tcm, struct netlink_callback *cb,
1636 struct qdisc_dump_args arg;
1638 if (tc_qdisc_dump_ignore(q) ||
1639 *t_p < s_t || !q->ops->cl_ops ||
1641 TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
1646 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
1647 arg.w.fn = qdisc_class_dump;
1651 arg.w.skip = cb->args[1];
1653 q->ops->cl_ops->walk(q, &arg.w);
1654 cb->args[1] = arg.w.count;
1661 static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
1662 struct tcmsg *tcm, struct netlink_callback *cb,
1670 if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
1673 list_for_each_entry(q, &root->list, list) {
1674 if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
1681 static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
1683 struct tcmsg *tcm = nlmsg_data(cb->nlh);
1684 struct net *net = sock_net(skb->sk);
1685 struct netdev_queue *dev_queue;
1686 struct net_device *dev;
1689 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
1691 dev = dev_get_by_index(net, tcm->tcm_ifindex);
1698 if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
1701 dev_queue = dev_ingress_queue(dev);
1703 tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
1714 /* Main classifier routine: scans classifier chain attached
1715 * to this qdisc, (optionally) tests for protocol and asks
1716 * specific classifiers.
1718 int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
1719 struct tcf_result *res)
1721 __be16 protocol = skb->protocol;
1724 for (; tp; tp = tp->next) {
1725 if (tp->protocol != protocol &&
1726 tp->protocol != htons(ETH_P_ALL))
1728 err = tp->classify(skb, tp, res);
1731 #ifdef CONFIG_NET_CLS_ACT
1732 if (err != TC_ACT_RECLASSIFY && skb->tc_verd)
1733 skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0);
1740 EXPORT_SYMBOL(tc_classify_compat);
1742 int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
1743 struct tcf_result *res)
1746 #ifdef CONFIG_NET_CLS_ACT
1747 const struct tcf_proto *otp = tp;
1751 err = tc_classify_compat(skb, tp, res);
1752 #ifdef CONFIG_NET_CLS_ACT
1753 if (err == TC_ACT_RECLASSIFY) {
1754 u32 verd = G_TC_VERD(skb->tc_verd);
1757 if (verd++ >= MAX_REC_LOOP) {
1758 net_notice_ratelimited("%s: packet reclassify loop rule prio %u protocol %02x\n",
1761 ntohs(tp->protocol));
1764 skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd);
1770 EXPORT_SYMBOL(tc_classify);
1772 void tcf_destroy(struct tcf_proto *tp)
1774 tp->ops->destroy(tp);
1775 module_put(tp->ops->owner);
1779 void tcf_destroy_chain(struct tcf_proto **fl)
1781 struct tcf_proto *tp;
1783 while ((tp = *fl) != NULL) {
1788 EXPORT_SYMBOL(tcf_destroy_chain);
1790 #ifdef CONFIG_PROC_FS
1791 static int psched_show(struct seq_file *seq, void *v)
1795 hrtimer_get_res(CLOCK_MONOTONIC, &ts);
1796 seq_printf(seq, "%08x %08x %08x %08x\n",
1797 (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
1799 (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts)));
1804 static int psched_open(struct inode *inode, struct file *file)
1806 return single_open(file, psched_show, NULL);
1809 static const struct file_operations psched_fops = {
1810 .owner = THIS_MODULE,
1811 .open = psched_open,
1813 .llseek = seq_lseek,
1814 .release = single_release,
1817 static int __net_init psched_net_init(struct net *net)
1819 struct proc_dir_entry *e;
1821 e = proc_create("psched", 0, net->proc_net, &psched_fops);
1828 static void __net_exit psched_net_exit(struct net *net)
1830 remove_proc_entry("psched", net->proc_net);
1833 static int __net_init psched_net_init(struct net *net)
1838 static void __net_exit psched_net_exit(struct net *net)
1843 static struct pernet_operations psched_net_ops = {
1844 .init = psched_net_init,
1845 .exit = psched_net_exit,
1848 static int __init pktsched_init(void)
1852 err = register_pernet_subsys(&psched_net_ops);
1854 pr_err("pktsched_init: "
1855 "cannot initialize per netns operations\n");
1859 register_qdisc(&pfifo_qdisc_ops);
1860 register_qdisc(&bfifo_qdisc_ops);
1861 register_qdisc(&pfifo_head_drop_qdisc_ops);
1862 register_qdisc(&mq_qdisc_ops);
1864 rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL);
1865 rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL);
1866 rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL);
1867 rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL);
1868 rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL);
1869 rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL);
1874 subsys_initcall(pktsched_init);