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/unregister 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 /* Get default qdisc if not otherwise specified */
204 void qdisc_get_default(char *name, size_t len)
206 read_lock(&qdisc_mod_lock);
207 strlcpy(name, default_qdisc_ops->id, len);
208 read_unlock(&qdisc_mod_lock);
211 static struct Qdisc_ops *qdisc_lookup_default(const char *name)
213 struct Qdisc_ops *q = NULL;
215 for (q = qdisc_base; q; q = q->next) {
216 if (!strcmp(name, q->id)) {
217 if (!try_module_get(q->owner))
226 /* Set new default qdisc to use */
227 int qdisc_set_default(const char *name)
229 const struct Qdisc_ops *ops;
231 if (!capable(CAP_NET_ADMIN))
234 write_lock(&qdisc_mod_lock);
235 ops = qdisc_lookup_default(name);
237 /* Not found, drop lock and try to load module */
238 write_unlock(&qdisc_mod_lock);
239 request_module("sch_%s", name);
240 write_lock(&qdisc_mod_lock);
242 ops = qdisc_lookup_default(name);
246 /* Set new default */
247 module_put(default_qdisc_ops->owner);
248 default_qdisc_ops = ops;
250 write_unlock(&qdisc_mod_lock);
252 return ops ? 0 : -ENOENT;
255 /* We know handle. Find qdisc among all qdisc's attached to device
256 (root qdisc, all its children, children of children etc.)
259 static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
263 if (!(root->flags & TCQ_F_BUILTIN) &&
264 root->handle == handle)
267 list_for_each_entry(q, &root->list, list) {
268 if (q->handle == handle)
274 void qdisc_list_add(struct Qdisc *q)
276 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
277 struct Qdisc *root = qdisc_dev(q)->qdisc;
279 WARN_ON_ONCE(root == &noop_qdisc);
280 list_add_tail(&q->list, &root->list);
283 EXPORT_SYMBOL(qdisc_list_add);
285 void qdisc_list_del(struct Qdisc *q)
287 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS))
290 EXPORT_SYMBOL(qdisc_list_del);
292 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
296 q = qdisc_match_from_root(dev->qdisc, handle);
300 if (dev_ingress_queue(dev))
301 q = qdisc_match_from_root(
302 dev_ingress_queue(dev)->qdisc_sleeping,
308 static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
312 const struct Qdisc_class_ops *cops = p->ops->cl_ops;
316 cl = cops->get(p, classid);
320 leaf = cops->leaf(p, cl);
325 /* Find queueing discipline by name */
327 static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind)
329 struct Qdisc_ops *q = NULL;
332 read_lock(&qdisc_mod_lock);
333 for (q = qdisc_base; q; q = q->next) {
334 if (nla_strcmp(kind, q->id) == 0) {
335 if (!try_module_get(q->owner))
340 read_unlock(&qdisc_mod_lock);
345 /* The linklayer setting were not transferred from iproute2, in older
346 * versions, and the rate tables lookup systems have been dropped in
347 * the kernel. To keep backward compatible with older iproute2 tc
348 * utils, we detect the linklayer setting by detecting if the rate
349 * table were modified.
351 * For linklayer ATM table entries, the rate table will be aligned to
352 * 48 bytes, thus some table entries will contain the same value. The
353 * mpu (min packet unit) is also encoded into the old rate table, thus
354 * starting from the mpu, we find low and high table entries for
355 * mapping this cell. If these entries contain the same value, when
356 * the rate tables have been modified for linklayer ATM.
358 * This is done by rounding mpu to the nearest 48 bytes cell/entry,
359 * and then roundup to the next cell, calc the table entry one below,
362 static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab)
364 int low = roundup(r->mpu, 48);
365 int high = roundup(low+1, 48);
366 int cell_low = low >> r->cell_log;
367 int cell_high = (high >> r->cell_log) - 1;
369 /* rtab is too inaccurate at rates > 100Mbit/s */
370 if ((r->rate > (100000000/8)) || (rtab[0] == 0)) {
371 pr_debug("TC linklayer: Giving up ATM detection\n");
372 return TC_LINKLAYER_ETHERNET;
375 if ((cell_high > cell_low) && (cell_high < 256)
376 && (rtab[cell_low] == rtab[cell_high])) {
377 pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n",
378 cell_low, cell_high, rtab[cell_high]);
379 return TC_LINKLAYER_ATM;
381 return TC_LINKLAYER_ETHERNET;
384 static struct qdisc_rate_table *qdisc_rtab_list;
386 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab)
388 struct qdisc_rate_table *rtab;
390 if (tab == NULL || r->rate == 0 || r->cell_log == 0 ||
391 nla_len(tab) != TC_RTAB_SIZE)
394 for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) {
395 if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) &&
396 !memcmp(&rtab->data, nla_data(tab), 1024)) {
402 rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
406 memcpy(rtab->data, nla_data(tab), 1024);
407 if (r->linklayer == TC_LINKLAYER_UNAWARE)
408 r->linklayer = __detect_linklayer(r, rtab->data);
409 rtab->next = qdisc_rtab_list;
410 qdisc_rtab_list = rtab;
414 EXPORT_SYMBOL(qdisc_get_rtab);
416 void qdisc_put_rtab(struct qdisc_rate_table *tab)
418 struct qdisc_rate_table *rtab, **rtabp;
420 if (!tab || --tab->refcnt)
423 for (rtabp = &qdisc_rtab_list;
424 (rtab = *rtabp) != NULL;
425 rtabp = &rtab->next) {
433 EXPORT_SYMBOL(qdisc_put_rtab);
435 static LIST_HEAD(qdisc_stab_list);
436 static DEFINE_SPINLOCK(qdisc_stab_lock);
438 static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = {
439 [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) },
440 [TCA_STAB_DATA] = { .type = NLA_BINARY },
443 static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt)
445 struct nlattr *tb[TCA_STAB_MAX + 1];
446 struct qdisc_size_table *stab;
447 struct tc_sizespec *s;
448 unsigned int tsize = 0;
452 err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy);
455 if (!tb[TCA_STAB_BASE])
456 return ERR_PTR(-EINVAL);
458 s = nla_data(tb[TCA_STAB_BASE]);
461 if (!tb[TCA_STAB_DATA])
462 return ERR_PTR(-EINVAL);
463 tab = nla_data(tb[TCA_STAB_DATA]);
464 tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16);
467 if (tsize != s->tsize || (!tab && tsize > 0))
468 return ERR_PTR(-EINVAL);
470 spin_lock(&qdisc_stab_lock);
472 list_for_each_entry(stab, &qdisc_stab_list, list) {
473 if (memcmp(&stab->szopts, s, sizeof(*s)))
475 if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16)))
478 spin_unlock(&qdisc_stab_lock);
482 spin_unlock(&qdisc_stab_lock);
484 stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL);
486 return ERR_PTR(-ENOMEM);
491 memcpy(stab->data, tab, tsize * sizeof(u16));
493 spin_lock(&qdisc_stab_lock);
494 list_add_tail(&stab->list, &qdisc_stab_list);
495 spin_unlock(&qdisc_stab_lock);
500 static void stab_kfree_rcu(struct rcu_head *head)
502 kfree(container_of(head, struct qdisc_size_table, rcu));
505 void qdisc_put_stab(struct qdisc_size_table *tab)
510 spin_lock(&qdisc_stab_lock);
512 if (--tab->refcnt == 0) {
513 list_del(&tab->list);
514 call_rcu_bh(&tab->rcu, stab_kfree_rcu);
517 spin_unlock(&qdisc_stab_lock);
519 EXPORT_SYMBOL(qdisc_put_stab);
521 static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab)
525 nest = nla_nest_start(skb, TCA_STAB);
527 goto nla_put_failure;
528 if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts))
529 goto nla_put_failure;
530 nla_nest_end(skb, nest);
538 void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab)
542 pkt_len = skb->len + stab->szopts.overhead;
543 if (unlikely(!stab->szopts.tsize))
546 slot = pkt_len + stab->szopts.cell_align;
547 if (unlikely(slot < 0))
550 slot >>= stab->szopts.cell_log;
551 if (likely(slot < stab->szopts.tsize))
552 pkt_len = stab->data[slot];
554 pkt_len = stab->data[stab->szopts.tsize - 1] *
555 (slot / stab->szopts.tsize) +
556 stab->data[slot % stab->szopts.tsize];
558 pkt_len <<= stab->szopts.size_log;
560 if (unlikely(pkt_len < 1))
562 qdisc_skb_cb(skb)->pkt_len = pkt_len;
564 EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
566 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc)
568 if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
569 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
570 txt, qdisc->ops->id, qdisc->handle >> 16);
571 qdisc->flags |= TCQ_F_WARN_NONWC;
574 EXPORT_SYMBOL(qdisc_warn_nonwc);
576 static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
578 struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
581 qdisc_unthrottled(wd->qdisc);
582 __netif_schedule(qdisc_root(wd->qdisc));
584 return HRTIMER_NORESTART;
587 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
589 hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
590 wd->timer.function = qdisc_watchdog;
593 EXPORT_SYMBOL(qdisc_watchdog_init);
595 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires)
597 if (test_bit(__QDISC_STATE_DEACTIVATED,
598 &qdisc_root_sleeping(wd->qdisc)->state))
601 qdisc_throttled(wd->qdisc);
603 hrtimer_start(&wd->timer,
604 ns_to_ktime(expires),
607 EXPORT_SYMBOL(qdisc_watchdog_schedule_ns);
609 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
611 hrtimer_cancel(&wd->timer);
612 qdisc_unthrottled(wd->qdisc);
614 EXPORT_SYMBOL(qdisc_watchdog_cancel);
616 static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
618 unsigned int size = n * sizeof(struct hlist_head), i;
619 struct hlist_head *h;
621 if (size <= PAGE_SIZE)
622 h = kmalloc(size, GFP_KERNEL);
624 h = (struct hlist_head *)
625 __get_free_pages(GFP_KERNEL, get_order(size));
628 for (i = 0; i < n; i++)
629 INIT_HLIST_HEAD(&h[i]);
634 static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n)
636 unsigned int size = n * sizeof(struct hlist_head);
638 if (size <= PAGE_SIZE)
641 free_pages((unsigned long)h, get_order(size));
644 void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
646 struct Qdisc_class_common *cl;
647 struct hlist_node *next;
648 struct hlist_head *nhash, *ohash;
649 unsigned int nsize, nmask, osize;
652 /* Rehash when load factor exceeds 0.75 */
653 if (clhash->hashelems * 4 <= clhash->hashsize * 3)
655 nsize = clhash->hashsize * 2;
657 nhash = qdisc_class_hash_alloc(nsize);
661 ohash = clhash->hash;
662 osize = clhash->hashsize;
665 for (i = 0; i < osize; i++) {
666 hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) {
667 h = qdisc_class_hash(cl->classid, nmask);
668 hlist_add_head(&cl->hnode, &nhash[h]);
671 clhash->hash = nhash;
672 clhash->hashsize = nsize;
673 clhash->hashmask = nmask;
674 sch_tree_unlock(sch);
676 qdisc_class_hash_free(ohash, osize);
678 EXPORT_SYMBOL(qdisc_class_hash_grow);
680 int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
682 unsigned int size = 4;
684 clhash->hash = qdisc_class_hash_alloc(size);
685 if (clhash->hash == NULL)
687 clhash->hashsize = size;
688 clhash->hashmask = size - 1;
689 clhash->hashelems = 0;
692 EXPORT_SYMBOL(qdisc_class_hash_init);
694 void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
696 qdisc_class_hash_free(clhash->hash, clhash->hashsize);
698 EXPORT_SYMBOL(qdisc_class_hash_destroy);
700 void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash,
701 struct Qdisc_class_common *cl)
705 INIT_HLIST_NODE(&cl->hnode);
706 h = qdisc_class_hash(cl->classid, clhash->hashmask);
707 hlist_add_head(&cl->hnode, &clhash->hash[h]);
710 EXPORT_SYMBOL(qdisc_class_hash_insert);
712 void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash,
713 struct Qdisc_class_common *cl)
715 hlist_del(&cl->hnode);
718 EXPORT_SYMBOL(qdisc_class_hash_remove);
720 /* Allocate an unique handle from space managed by kernel
721 * Possible range is [8000-FFFF]:0000 (0x8000 values)
723 static u32 qdisc_alloc_handle(struct net_device *dev)
726 static u32 autohandle = TC_H_MAKE(0x80000000U, 0);
729 autohandle += TC_H_MAKE(0x10000U, 0);
730 if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
731 autohandle = TC_H_MAKE(0x80000000U, 0);
732 if (!qdisc_lookup(dev, autohandle))
740 void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)
742 const struct Qdisc_class_ops *cops;
749 drops = max_t(int, n, 0);
750 while ((parentid = sch->parent)) {
751 if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
754 sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
756 WARN_ON(parentid != TC_H_ROOT);
759 cops = sch->ops->cl_ops;
760 if (cops->qlen_notify) {
761 cl = cops->get(sch, parentid);
762 cops->qlen_notify(sch, cl);
766 sch->qstats.drops += drops;
769 EXPORT_SYMBOL(qdisc_tree_decrease_qlen);
771 static void notify_and_destroy(struct net *net, struct sk_buff *skb,
772 struct nlmsghdr *n, u32 clid,
773 struct Qdisc *old, struct Qdisc *new)
776 qdisc_notify(net, skb, n, clid, old, new);
782 /* Graft qdisc "new" to class "classid" of qdisc "parent" or
785 * When appropriate send a netlink notification using 'skb'
788 * On success, destroy old qdisc.
791 static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
792 struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
793 struct Qdisc *new, struct Qdisc *old)
795 struct Qdisc *q = old;
796 struct net *net = dev_net(dev);
799 if (parent == NULL) {
800 unsigned int i, num_q, ingress;
803 num_q = dev->num_tx_queues;
804 if ((q && q->flags & TCQ_F_INGRESS) ||
805 (new && new->flags & TCQ_F_INGRESS)) {
808 if (!dev_ingress_queue(dev))
812 if (dev->flags & IFF_UP)
815 if (new && new->ops->attach) {
816 new->ops->attach(new);
820 for (i = 0; i < num_q; i++) {
821 struct netdev_queue *dev_queue = dev_ingress_queue(dev);
824 dev_queue = netdev_get_tx_queue(dev, i);
826 old = dev_graft_qdisc(dev_queue, new);
828 atomic_inc(&new->refcnt);
835 notify_and_destroy(net, skb, n, classid,
837 if (new && !new->ops->attach)
838 atomic_inc(&new->refcnt);
839 dev->qdisc = new ? : &noop_qdisc;
841 notify_and_destroy(net, skb, n, classid, old, new);
844 if (dev->flags & IFF_UP)
847 const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
850 if (cops && cops->graft) {
851 unsigned long cl = cops->get(parent, classid);
853 err = cops->graft(parent, cl, new, &old);
854 cops->put(parent, cl);
859 notify_and_destroy(net, skb, n, classid, old, new);
864 /* lockdep annotation is needed for ingress; egress gets it only for name */
865 static struct lock_class_key qdisc_tx_lock;
866 static struct lock_class_key qdisc_rx_lock;
869 Allocate and initialize new qdisc.
871 Parameters are passed via opt.
874 static struct Qdisc *
875 qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
876 struct Qdisc *p, u32 parent, u32 handle,
877 struct nlattr **tca, int *errp)
880 struct nlattr *kind = tca[TCA_KIND];
882 struct Qdisc_ops *ops;
883 struct qdisc_size_table *stab;
885 ops = qdisc_lookup_ops(kind);
886 #ifdef CONFIG_MODULES
887 if (ops == NULL && kind != NULL) {
889 if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
890 /* We dropped the RTNL semaphore in order to
891 * perform the module load. So, even if we
892 * succeeded in loading the module we have to
893 * tell the caller to replay the request. We
894 * indicate this using -EAGAIN.
895 * We replay the request because the device may
896 * go away in the mean time.
899 request_module("sch_%s", name);
901 ops = qdisc_lookup_ops(kind);
903 /* We will try again qdisc_lookup_ops,
904 * so don't keep a reference.
906 module_put(ops->owner);
918 sch = qdisc_alloc(dev_queue, ops);
924 sch->parent = parent;
926 if (handle == TC_H_INGRESS) {
927 sch->flags |= TCQ_F_INGRESS;
928 handle = TC_H_MAKE(TC_H_INGRESS, 0);
929 lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock);
932 handle = qdisc_alloc_handle(dev);
937 lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock);
938 if (!netif_is_multiqueue(dev))
939 sch->flags |= TCQ_F_ONETXQUEUE;
942 sch->handle = handle;
944 if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) {
946 stab = qdisc_get_stab(tca[TCA_STAB]);
951 rcu_assign_pointer(sch->stab, stab);
954 spinlock_t *root_lock;
957 if (sch->flags & TCQ_F_MQROOT)
960 if ((sch->parent != TC_H_ROOT) &&
961 !(sch->flags & TCQ_F_INGRESS) &&
962 (!p || !(p->flags & TCQ_F_MQROOT)))
963 root_lock = qdisc_root_sleeping_lock(sch);
965 root_lock = qdisc_lock(sch);
967 err = gen_new_estimator(&sch->bstats, &sch->rate_est,
968 root_lock, tca[TCA_RATE]);
979 kfree((char *) sch - sch->padded);
981 module_put(ops->owner);
988 * Any broken qdiscs that would require a ops->reset() here?
989 * The qdisc was never in action so it shouldn't be necessary.
991 qdisc_put_stab(rtnl_dereference(sch->stab));
997 static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
999 struct qdisc_size_table *ostab, *stab = NULL;
1002 if (tca[TCA_OPTIONS]) {
1003 if (sch->ops->change == NULL)
1005 err = sch->ops->change(sch, tca[TCA_OPTIONS]);
1010 if (tca[TCA_STAB]) {
1011 stab = qdisc_get_stab(tca[TCA_STAB]);
1013 return PTR_ERR(stab);
1016 ostab = rtnl_dereference(sch->stab);
1017 rcu_assign_pointer(sch->stab, stab);
1018 qdisc_put_stab(ostab);
1020 if (tca[TCA_RATE]) {
1021 /* NB: ignores errors from replace_estimator
1022 because change can't be undone. */
1023 if (sch->flags & TCQ_F_MQROOT)
1025 gen_replace_estimator(&sch->bstats, &sch->rate_est,
1026 qdisc_root_sleeping_lock(sch),
1033 struct check_loop_arg {
1034 struct qdisc_walker w;
1039 static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w);
1041 static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
1043 struct check_loop_arg arg;
1045 if (q->ops->cl_ops == NULL)
1048 arg.w.stop = arg.w.skip = arg.w.count = 0;
1049 arg.w.fn = check_loop_fn;
1052 q->ops->cl_ops->walk(q, &arg.w);
1053 return arg.w.stop ? -ELOOP : 0;
1057 check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
1060 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1061 struct check_loop_arg *arg = (struct check_loop_arg *)w;
1063 leaf = cops->leaf(q, cl);
1065 if (leaf == arg->p || arg->depth > 7)
1067 return check_loop(leaf, arg->p, arg->depth + 1);
1076 static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
1078 struct net *net = sock_net(skb->sk);
1079 struct tcmsg *tcm = nlmsg_data(n);
1080 struct nlattr *tca[TCA_MAX + 1];
1081 struct net_device *dev;
1083 struct Qdisc *q = NULL;
1084 struct Qdisc *p = NULL;
1087 if ((n->nlmsg_type != RTM_GETQDISC) &&
1088 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1091 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1095 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1099 clid = tcm->tcm_parent;
1101 if (clid != TC_H_ROOT) {
1102 if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
1103 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1106 q = qdisc_leaf(p, clid);
1107 } else if (dev_ingress_queue(dev)) {
1108 q = dev_ingress_queue(dev)->qdisc_sleeping;
1116 if (tcm->tcm_handle && q->handle != tcm->tcm_handle)
1119 q = qdisc_lookup(dev, tcm->tcm_handle);
1124 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1127 if (n->nlmsg_type == RTM_DELQDISC) {
1132 err = qdisc_graft(dev, p, skb, n, clid, NULL, q);
1136 qdisc_notify(net, skb, n, clid, NULL, q);
1142 * Create/change qdisc.
1145 static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
1147 struct net *net = sock_net(skb->sk);
1149 struct nlattr *tca[TCA_MAX + 1];
1150 struct net_device *dev;
1152 struct Qdisc *q, *p;
1155 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1159 /* Reinit, just in case something touches this. */
1160 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1164 tcm = nlmsg_data(n);
1165 clid = tcm->tcm_parent;
1168 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1174 if (clid != TC_H_ROOT) {
1175 if (clid != TC_H_INGRESS) {
1176 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1179 q = qdisc_leaf(p, clid);
1180 } else if (dev_ingress_queue_create(dev)) {
1181 q = dev_ingress_queue(dev)->qdisc_sleeping;
1187 /* It may be default qdisc, ignore it */
1188 if (q && q->handle == 0)
1191 if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
1192 if (tcm->tcm_handle) {
1193 if (q && !(n->nlmsg_flags & NLM_F_REPLACE))
1195 if (TC_H_MIN(tcm->tcm_handle))
1197 q = qdisc_lookup(dev, tcm->tcm_handle);
1199 goto create_n_graft;
1200 if (n->nlmsg_flags & NLM_F_EXCL)
1202 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1205 (p && check_loop(q, p, 0)))
1207 atomic_inc(&q->refcnt);
1211 goto create_n_graft;
1213 /* This magic test requires explanation.
1215 * We know, that some child q is already
1216 * attached to this parent and have choice:
1217 * either to change it or to create/graft new one.
1219 * 1. We are allowed to create/graft only
1220 * if CREATE and REPLACE flags are set.
1222 * 2. If EXCL is set, requestor wanted to say,
1223 * that qdisc tcm_handle is not expected
1224 * to exist, so that we choose create/graft too.
1226 * 3. The last case is when no flags are set.
1227 * Alas, it is sort of hole in API, we
1228 * cannot decide what to do unambiguously.
1229 * For now we select create/graft, if
1230 * user gave KIND, which does not match existing.
1232 if ((n->nlmsg_flags & NLM_F_CREATE) &&
1233 (n->nlmsg_flags & NLM_F_REPLACE) &&
1234 ((n->nlmsg_flags & NLM_F_EXCL) ||
1236 nla_strcmp(tca[TCA_KIND], q->ops->id))))
1237 goto create_n_graft;
1241 if (!tcm->tcm_handle)
1243 q = qdisc_lookup(dev, tcm->tcm_handle);
1246 /* Change qdisc parameters */
1249 if (n->nlmsg_flags & NLM_F_EXCL)
1251 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1253 err = qdisc_change(q, tca);
1255 qdisc_notify(net, skb, n, clid, NULL, q);
1259 if (!(n->nlmsg_flags & NLM_F_CREATE))
1261 if (clid == TC_H_INGRESS) {
1262 if (dev_ingress_queue(dev))
1263 q = qdisc_create(dev, dev_ingress_queue(dev), p,
1264 tcm->tcm_parent, tcm->tcm_parent,
1269 struct netdev_queue *dev_queue;
1271 if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
1272 dev_queue = p->ops->cl_ops->select_queue(p, tcm);
1274 dev_queue = p->dev_queue;
1276 dev_queue = netdev_get_tx_queue(dev, 0);
1278 q = qdisc_create(dev, dev_queue, p,
1279 tcm->tcm_parent, tcm->tcm_handle,
1289 err = qdisc_graft(dev, p, skb, n, clid, q, NULL);
1299 static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
1300 u32 portid, u32 seq, u16 flags, int event)
1303 struct nlmsghdr *nlh;
1304 unsigned char *b = skb_tail_pointer(skb);
1306 struct qdisc_size_table *stab;
1309 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1311 goto out_nlmsg_trim;
1312 tcm = nlmsg_data(nlh);
1313 tcm->tcm_family = AF_UNSPEC;
1316 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1317 tcm->tcm_parent = clid;
1318 tcm->tcm_handle = q->handle;
1319 tcm->tcm_info = atomic_read(&q->refcnt);
1320 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1321 goto nla_put_failure;
1322 if (q->ops->dump && q->ops->dump(q, skb) < 0)
1323 goto nla_put_failure;
1324 q->qstats.qlen = q->q.qlen;
1326 stab = rtnl_dereference(q->stab);
1327 if (stab && qdisc_dump_stab(skb, stab) < 0)
1328 goto nla_put_failure;
1330 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1331 qdisc_root_sleeping_lock(q), &d) < 0)
1332 goto nla_put_failure;
1334 if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
1335 goto nla_put_failure;
1337 if (gnet_stats_copy_basic(&d, &q->bstats) < 0 ||
1338 gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 ||
1339 gnet_stats_copy_queue(&d, &q->qstats) < 0)
1340 goto nla_put_failure;
1342 if (gnet_stats_finish_copy(&d) < 0)
1343 goto nla_put_failure;
1345 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1354 static bool tc_qdisc_dump_ignore(struct Qdisc *q)
1356 return (q->flags & TCQ_F_BUILTIN) ? true : false;
1359 static int qdisc_notify(struct net *net, struct sk_buff *oskb,
1360 struct nlmsghdr *n, u32 clid,
1361 struct Qdisc *old, struct Qdisc *new)
1363 struct sk_buff *skb;
1364 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1366 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1370 if (old && !tc_qdisc_dump_ignore(old)) {
1371 if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq,
1372 0, RTM_DELQDISC) < 0)
1375 if (new && !tc_qdisc_dump_ignore(new)) {
1376 if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq,
1377 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
1382 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1383 n->nlmsg_flags & NLM_F_ECHO);
1390 static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
1391 struct netlink_callback *cb,
1392 int *q_idx_p, int s_q_idx)
1394 int ret = 0, q_idx = *q_idx_p;
1401 if (q_idx < s_q_idx) {
1404 if (!tc_qdisc_dump_ignore(q) &&
1405 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1406 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1410 list_for_each_entry(q, &root->list, list) {
1411 if (q_idx < s_q_idx) {
1415 if (!tc_qdisc_dump_ignore(q) &&
1416 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1417 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1430 static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
1432 struct net *net = sock_net(skb->sk);
1435 struct net_device *dev;
1437 s_idx = cb->args[0];
1438 s_q_idx = q_idx = cb->args[1];
1442 for_each_netdev(net, dev) {
1443 struct netdev_queue *dev_queue;
1451 if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0)
1454 dev_queue = dev_ingress_queue(dev);
1456 tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
1457 &q_idx, s_q_idx) < 0)
1466 cb->args[1] = q_idx;
1473 /************************************************
1474 * Traffic classes manipulation. *
1475 ************************************************/
1479 static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n)
1481 struct net *net = sock_net(skb->sk);
1482 struct tcmsg *tcm = nlmsg_data(n);
1483 struct nlattr *tca[TCA_MAX + 1];
1484 struct net_device *dev;
1485 struct Qdisc *q = NULL;
1486 const struct Qdisc_class_ops *cops;
1487 unsigned long cl = 0;
1488 unsigned long new_cl;
1494 if ((n->nlmsg_type != RTM_GETTCLASS) &&
1495 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1498 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1502 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1507 parent == TC_H_UNSPEC - unspecified parent.
1508 parent == TC_H_ROOT - class is root, which has no parent.
1509 parent == X:0 - parent is root class.
1510 parent == X:Y - parent is a node in hierarchy.
1511 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1513 handle == 0:0 - generate handle from kernel pool.
1514 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1515 handle == X:Y - clear.
1516 handle == X:0 - root class.
1519 /* Step 1. Determine qdisc handle X:0 */
1521 portid = tcm->tcm_parent;
1522 clid = tcm->tcm_handle;
1523 qid = TC_H_MAJ(clid);
1525 if (portid != TC_H_ROOT) {
1526 u32 qid1 = TC_H_MAJ(portid);
1529 /* If both majors are known, they must be identical. */
1534 } else if (qid == 0)
1535 qid = dev->qdisc->handle;
1537 /* Now qid is genuine qdisc handle consistent
1538 * both with parent and child.
1540 * TC_H_MAJ(portid) still may be unspecified, complete it now.
1543 portid = TC_H_MAKE(qid, portid);
1546 qid = dev->qdisc->handle;
1549 /* OK. Locate qdisc */
1550 q = qdisc_lookup(dev, qid);
1554 /* An check that it supports classes */
1555 cops = q->ops->cl_ops;
1559 /* Now try to get class */
1561 if (portid == TC_H_ROOT)
1564 clid = TC_H_MAKE(qid, clid);
1567 cl = cops->get(q, clid);
1571 if (n->nlmsg_type != RTM_NEWTCLASS ||
1572 !(n->nlmsg_flags & NLM_F_CREATE))
1575 switch (n->nlmsg_type) {
1578 if (n->nlmsg_flags & NLM_F_EXCL)
1584 err = cops->delete(q, cl);
1586 tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS);
1589 err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
1600 err = cops->change(q, clid, portid, tca, &new_cl);
1602 tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
1612 static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
1614 u32 portid, u32 seq, u16 flags, int event)
1617 struct nlmsghdr *nlh;
1618 unsigned char *b = skb_tail_pointer(skb);
1620 const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
1623 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1625 goto out_nlmsg_trim;
1626 tcm = nlmsg_data(nlh);
1627 tcm->tcm_family = AF_UNSPEC;
1630 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1631 tcm->tcm_parent = q->handle;
1632 tcm->tcm_handle = q->handle;
1634 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1635 goto nla_put_failure;
1636 if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
1637 goto nla_put_failure;
1639 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1640 qdisc_root_sleeping_lock(q), &d) < 0)
1641 goto nla_put_failure;
1643 if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
1644 goto nla_put_failure;
1646 if (gnet_stats_finish_copy(&d) < 0)
1647 goto nla_put_failure;
1649 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1658 static int tclass_notify(struct net *net, struct sk_buff *oskb,
1659 struct nlmsghdr *n, struct Qdisc *q,
1660 unsigned long cl, int event)
1662 struct sk_buff *skb;
1663 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1665 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1669 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) {
1674 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1675 n->nlmsg_flags & NLM_F_ECHO);
1678 struct qdisc_dump_args {
1679 struct qdisc_walker w;
1680 struct sk_buff *skb;
1681 struct netlink_callback *cb;
1684 static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg)
1686 struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
1688 return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid,
1689 a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS);
1692 static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
1693 struct tcmsg *tcm, struct netlink_callback *cb,
1696 struct qdisc_dump_args arg;
1698 if (tc_qdisc_dump_ignore(q) ||
1699 *t_p < s_t || !q->ops->cl_ops ||
1701 TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
1706 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
1707 arg.w.fn = qdisc_class_dump;
1711 arg.w.skip = cb->args[1];
1713 q->ops->cl_ops->walk(q, &arg.w);
1714 cb->args[1] = arg.w.count;
1721 static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
1722 struct tcmsg *tcm, struct netlink_callback *cb,
1730 if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
1733 list_for_each_entry(q, &root->list, list) {
1734 if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
1741 static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
1743 struct tcmsg *tcm = nlmsg_data(cb->nlh);
1744 struct net *net = sock_net(skb->sk);
1745 struct netdev_queue *dev_queue;
1746 struct net_device *dev;
1749 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
1751 dev = dev_get_by_index(net, tcm->tcm_ifindex);
1758 if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
1761 dev_queue = dev_ingress_queue(dev);
1763 tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
1774 /* Main classifier routine: scans classifier chain attached
1775 * to this qdisc, (optionally) tests for protocol and asks
1776 * specific classifiers.
1778 int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
1779 struct tcf_result *res)
1781 __be16 protocol = skb->protocol;
1784 for (; tp; tp = tp->next) {
1785 if (tp->protocol != protocol &&
1786 tp->protocol != htons(ETH_P_ALL))
1788 err = tp->classify(skb, tp, res);
1791 #ifdef CONFIG_NET_CLS_ACT
1792 if (err != TC_ACT_RECLASSIFY && skb->tc_verd)
1793 skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0);
1800 EXPORT_SYMBOL(tc_classify_compat);
1802 int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
1803 struct tcf_result *res)
1806 #ifdef CONFIG_NET_CLS_ACT
1807 const struct tcf_proto *otp = tp;
1811 err = tc_classify_compat(skb, tp, res);
1812 #ifdef CONFIG_NET_CLS_ACT
1813 if (err == TC_ACT_RECLASSIFY) {
1814 u32 verd = G_TC_VERD(skb->tc_verd);
1817 if (verd++ >= MAX_REC_LOOP) {
1818 net_notice_ratelimited("%s: packet reclassify loop rule prio %u protocol %02x\n",
1821 ntohs(tp->protocol));
1824 skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd);
1830 EXPORT_SYMBOL(tc_classify);
1832 void tcf_destroy(struct tcf_proto *tp)
1834 tp->ops->destroy(tp);
1835 module_put(tp->ops->owner);
1839 void tcf_destroy_chain(struct tcf_proto **fl)
1841 struct tcf_proto *tp;
1843 while ((tp = *fl) != NULL) {
1848 EXPORT_SYMBOL(tcf_destroy_chain);
1850 #ifdef CONFIG_PROC_FS
1851 static int psched_show(struct seq_file *seq, void *v)
1855 hrtimer_get_res(CLOCK_MONOTONIC, &ts);
1856 seq_printf(seq, "%08x %08x %08x %08x\n",
1857 (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
1859 (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts)));
1864 static int psched_open(struct inode *inode, struct file *file)
1866 return single_open(file, psched_show, NULL);
1869 static const struct file_operations psched_fops = {
1870 .owner = THIS_MODULE,
1871 .open = psched_open,
1873 .llseek = seq_lseek,
1874 .release = single_release,
1877 static int __net_init psched_net_init(struct net *net)
1879 struct proc_dir_entry *e;
1881 e = proc_create("psched", 0, net->proc_net, &psched_fops);
1888 static void __net_exit psched_net_exit(struct net *net)
1890 remove_proc_entry("psched", net->proc_net);
1893 static int __net_init psched_net_init(struct net *net)
1898 static void __net_exit psched_net_exit(struct net *net)
1903 static struct pernet_operations psched_net_ops = {
1904 .init = psched_net_init,
1905 .exit = psched_net_exit,
1908 static int __init pktsched_init(void)
1912 err = register_pernet_subsys(&psched_net_ops);
1914 pr_err("pktsched_init: "
1915 "cannot initialize per netns operations\n");
1919 register_qdisc(&pfifo_fast_ops);
1920 register_qdisc(&pfifo_qdisc_ops);
1921 register_qdisc(&bfifo_qdisc_ops);
1922 register_qdisc(&pfifo_head_drop_qdisc_ops);
1923 register_qdisc(&mq_qdisc_ops);
1925 rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL);
1926 rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL);
1927 rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL);
1928 rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL);
1929 rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL);
1930 rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL);
1935 subsys_initcall(pktsched_init);