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 static struct qdisc_rate_table
*qdisc_rtab_list
;
290 struct qdisc_rate_table
*qdisc_get_rtab(struct tc_ratespec
*r
, struct nlattr
*tab
)
292 struct qdisc_rate_table
*rtab
;
294 for (rtab
= qdisc_rtab_list
; rtab
; rtab
= rtab
->next
) {
295 if (memcmp(&rtab
->rate
, r
, sizeof(struct tc_ratespec
)) == 0) {
301 if (tab
== NULL
|| r
->rate
== 0 || r
->cell_log
== 0 ||
302 nla_len(tab
) != TC_RTAB_SIZE
)
305 rtab
= kmalloc(sizeof(*rtab
), GFP_KERNEL
);
309 memcpy(rtab
->data
, nla_data(tab
), 1024);
310 rtab
->next
= qdisc_rtab_list
;
311 qdisc_rtab_list
= rtab
;
315 EXPORT_SYMBOL(qdisc_get_rtab
);
317 void qdisc_put_rtab(struct qdisc_rate_table
*tab
)
319 struct qdisc_rate_table
*rtab
, **rtabp
;
321 if (!tab
|| --tab
->refcnt
)
324 for (rtabp
= &qdisc_rtab_list
;
325 (rtab
= *rtabp
) != NULL
;
326 rtabp
= &rtab
->next
) {
334 EXPORT_SYMBOL(qdisc_put_rtab
);
336 static LIST_HEAD(qdisc_stab_list
);
337 static DEFINE_SPINLOCK(qdisc_stab_lock
);
339 static const struct nla_policy stab_policy
[TCA_STAB_MAX
+ 1] = {
340 [TCA_STAB_BASE
] = { .len
= sizeof(struct tc_sizespec
) },
341 [TCA_STAB_DATA
] = { .type
= NLA_BINARY
},
344 static struct qdisc_size_table
*qdisc_get_stab(struct nlattr
*opt
)
346 struct nlattr
*tb
[TCA_STAB_MAX
+ 1];
347 struct qdisc_size_table
*stab
;
348 struct tc_sizespec
*s
;
349 unsigned int tsize
= 0;
353 err
= nla_parse_nested(tb
, TCA_STAB_MAX
, opt
, stab_policy
);
356 if (!tb
[TCA_STAB_BASE
])
357 return ERR_PTR(-EINVAL
);
359 s
= nla_data(tb
[TCA_STAB_BASE
]);
362 if (!tb
[TCA_STAB_DATA
])
363 return ERR_PTR(-EINVAL
);
364 tab
= nla_data(tb
[TCA_STAB_DATA
]);
365 tsize
= nla_len(tb
[TCA_STAB_DATA
]) / sizeof(u16
);
368 if (tsize
!= s
->tsize
|| (!tab
&& tsize
> 0))
369 return ERR_PTR(-EINVAL
);
371 spin_lock(&qdisc_stab_lock
);
373 list_for_each_entry(stab
, &qdisc_stab_list
, list
) {
374 if (memcmp(&stab
->szopts
, s
, sizeof(*s
)))
376 if (tsize
> 0 && memcmp(stab
->data
, tab
, tsize
* sizeof(u16
)))
379 spin_unlock(&qdisc_stab_lock
);
383 spin_unlock(&qdisc_stab_lock
);
385 stab
= kmalloc(sizeof(*stab
) + tsize
* sizeof(u16
), GFP_KERNEL
);
387 return ERR_PTR(-ENOMEM
);
392 memcpy(stab
->data
, tab
, tsize
* sizeof(u16
));
394 spin_lock(&qdisc_stab_lock
);
395 list_add_tail(&stab
->list
, &qdisc_stab_list
);
396 spin_unlock(&qdisc_stab_lock
);
401 static void stab_kfree_rcu(struct rcu_head
*head
)
403 kfree(container_of(head
, struct qdisc_size_table
, rcu
));
406 void qdisc_put_stab(struct qdisc_size_table
*tab
)
411 spin_lock(&qdisc_stab_lock
);
413 if (--tab
->refcnt
== 0) {
414 list_del(&tab
->list
);
415 call_rcu_bh(&tab
->rcu
, stab_kfree_rcu
);
418 spin_unlock(&qdisc_stab_lock
);
420 EXPORT_SYMBOL(qdisc_put_stab
);
422 static int qdisc_dump_stab(struct sk_buff
*skb
, struct qdisc_size_table
*stab
)
426 nest
= nla_nest_start(skb
, TCA_STAB
);
428 goto nla_put_failure
;
429 if (nla_put(skb
, TCA_STAB_BASE
, sizeof(stab
->szopts
), &stab
->szopts
))
430 goto nla_put_failure
;
431 nla_nest_end(skb
, nest
);
439 void __qdisc_calculate_pkt_len(struct sk_buff
*skb
, const struct qdisc_size_table
*stab
)
443 pkt_len
= skb
->len
+ stab
->szopts
.overhead
;
444 if (unlikely(!stab
->szopts
.tsize
))
447 slot
= pkt_len
+ stab
->szopts
.cell_align
;
448 if (unlikely(slot
< 0))
451 slot
>>= stab
->szopts
.cell_log
;
452 if (likely(slot
< stab
->szopts
.tsize
))
453 pkt_len
= stab
->data
[slot
];
455 pkt_len
= stab
->data
[stab
->szopts
.tsize
- 1] *
456 (slot
/ stab
->szopts
.tsize
) +
457 stab
->data
[slot
% stab
->szopts
.tsize
];
459 pkt_len
<<= stab
->szopts
.size_log
;
461 if (unlikely(pkt_len
< 1))
463 qdisc_skb_cb(skb
)->pkt_len
= pkt_len
;
465 EXPORT_SYMBOL(__qdisc_calculate_pkt_len
);
467 void qdisc_warn_nonwc(char *txt
, struct Qdisc
*qdisc
)
469 if (!(qdisc
->flags
& TCQ_F_WARN_NONWC
)) {
470 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
471 txt
, qdisc
->ops
->id
, qdisc
->handle
>> 16);
472 qdisc
->flags
|= TCQ_F_WARN_NONWC
;
475 EXPORT_SYMBOL(qdisc_warn_nonwc
);
477 static enum hrtimer_restart
qdisc_watchdog(struct hrtimer
*timer
)
479 struct qdisc_watchdog
*wd
= container_of(timer
, struct qdisc_watchdog
,
482 qdisc_unthrottled(wd
->qdisc
);
483 __netif_schedule(qdisc_root(wd
->qdisc
));
485 return HRTIMER_NORESTART
;
488 void qdisc_watchdog_init(struct qdisc_watchdog
*wd
, struct Qdisc
*qdisc
)
490 hrtimer_init(&wd
->timer
, CLOCK_MONOTONIC
, HRTIMER_MODE_ABS
);
491 wd
->timer
.function
= qdisc_watchdog
;
494 EXPORT_SYMBOL(qdisc_watchdog_init
);
496 void qdisc_watchdog_schedule(struct qdisc_watchdog
*wd
, psched_time_t expires
)
498 if (test_bit(__QDISC_STATE_DEACTIVATED
,
499 &qdisc_root_sleeping(wd
->qdisc
)->state
))
502 qdisc_throttled(wd
->qdisc
);
504 hrtimer_start(&wd
->timer
,
505 ns_to_ktime(PSCHED_TICKS2NS(expires
)),
508 EXPORT_SYMBOL(qdisc_watchdog_schedule
);
510 void qdisc_watchdog_cancel(struct qdisc_watchdog
*wd
)
512 hrtimer_cancel(&wd
->timer
);
513 qdisc_unthrottled(wd
->qdisc
);
515 EXPORT_SYMBOL(qdisc_watchdog_cancel
);
517 static struct hlist_head
*qdisc_class_hash_alloc(unsigned int n
)
519 unsigned int size
= n
* sizeof(struct hlist_head
), i
;
520 struct hlist_head
*h
;
522 if (size
<= PAGE_SIZE
)
523 h
= kmalloc(size
, GFP_KERNEL
);
525 h
= (struct hlist_head
*)
526 __get_free_pages(GFP_KERNEL
, get_order(size
));
529 for (i
= 0; i
< n
; i
++)
530 INIT_HLIST_HEAD(&h
[i
]);
535 static void qdisc_class_hash_free(struct hlist_head
*h
, unsigned int n
)
537 unsigned int size
= n
* sizeof(struct hlist_head
);
539 if (size
<= PAGE_SIZE
)
542 free_pages((unsigned long)h
, get_order(size
));
545 void qdisc_class_hash_grow(struct Qdisc
*sch
, struct Qdisc_class_hash
*clhash
)
547 struct Qdisc_class_common
*cl
;
548 struct hlist_node
*n
, *next
;
549 struct hlist_head
*nhash
, *ohash
;
550 unsigned int nsize
, nmask
, osize
;
553 /* Rehash when load factor exceeds 0.75 */
554 if (clhash
->hashelems
* 4 <= clhash
->hashsize
* 3)
556 nsize
= clhash
->hashsize
* 2;
558 nhash
= qdisc_class_hash_alloc(nsize
);
562 ohash
= clhash
->hash
;
563 osize
= clhash
->hashsize
;
566 for (i
= 0; i
< osize
; i
++) {
567 hlist_for_each_entry_safe(cl
, n
, next
, &ohash
[i
], hnode
) {
568 h
= qdisc_class_hash(cl
->classid
, nmask
);
569 hlist_add_head(&cl
->hnode
, &nhash
[h
]);
572 clhash
->hash
= nhash
;
573 clhash
->hashsize
= nsize
;
574 clhash
->hashmask
= nmask
;
575 sch_tree_unlock(sch
);
577 qdisc_class_hash_free(ohash
, osize
);
579 EXPORT_SYMBOL(qdisc_class_hash_grow
);
581 int qdisc_class_hash_init(struct Qdisc_class_hash
*clhash
)
583 unsigned int size
= 4;
585 clhash
->hash
= qdisc_class_hash_alloc(size
);
586 if (clhash
->hash
== NULL
)
588 clhash
->hashsize
= size
;
589 clhash
->hashmask
= size
- 1;
590 clhash
->hashelems
= 0;
593 EXPORT_SYMBOL(qdisc_class_hash_init
);
595 void qdisc_class_hash_destroy(struct Qdisc_class_hash
*clhash
)
597 qdisc_class_hash_free(clhash
->hash
, clhash
->hashsize
);
599 EXPORT_SYMBOL(qdisc_class_hash_destroy
);
601 void qdisc_class_hash_insert(struct Qdisc_class_hash
*clhash
,
602 struct Qdisc_class_common
*cl
)
606 INIT_HLIST_NODE(&cl
->hnode
);
607 h
= qdisc_class_hash(cl
->classid
, clhash
->hashmask
);
608 hlist_add_head(&cl
->hnode
, &clhash
->hash
[h
]);
611 EXPORT_SYMBOL(qdisc_class_hash_insert
);
613 void qdisc_class_hash_remove(struct Qdisc_class_hash
*clhash
,
614 struct Qdisc_class_common
*cl
)
616 hlist_del(&cl
->hnode
);
619 EXPORT_SYMBOL(qdisc_class_hash_remove
);
621 /* Allocate an unique handle from space managed by kernel
622 * Possible range is [8000-FFFF]:0000 (0x8000 values)
624 static u32
qdisc_alloc_handle(struct net_device
*dev
)
627 static u32 autohandle
= TC_H_MAKE(0x80000000U
, 0);
630 autohandle
+= TC_H_MAKE(0x10000U
, 0);
631 if (autohandle
== TC_H_MAKE(TC_H_ROOT
, 0))
632 autohandle
= TC_H_MAKE(0x80000000U
, 0);
633 if (!qdisc_lookup(dev
, autohandle
))
641 void qdisc_tree_decrease_qlen(struct Qdisc
*sch
, unsigned int n
)
643 const struct Qdisc_class_ops
*cops
;
649 while ((parentid
= sch
->parent
)) {
650 if (TC_H_MAJ(parentid
) == TC_H_MAJ(TC_H_INGRESS
))
653 sch
= qdisc_lookup(qdisc_dev(sch
), TC_H_MAJ(parentid
));
655 WARN_ON(parentid
!= TC_H_ROOT
);
658 cops
= sch
->ops
->cl_ops
;
659 if (cops
->qlen_notify
) {
660 cl
= cops
->get(sch
, parentid
);
661 cops
->qlen_notify(sch
, cl
);
667 EXPORT_SYMBOL(qdisc_tree_decrease_qlen
);
669 static void notify_and_destroy(struct net
*net
, struct sk_buff
*skb
,
670 struct nlmsghdr
*n
, u32 clid
,
671 struct Qdisc
*old
, struct Qdisc
*new)
674 qdisc_notify(net
, skb
, n
, clid
, old
, new);
680 /* Graft qdisc "new" to class "classid" of qdisc "parent" or
683 * When appropriate send a netlink notification using 'skb'
686 * On success, destroy old qdisc.
689 static int qdisc_graft(struct net_device
*dev
, struct Qdisc
*parent
,
690 struct sk_buff
*skb
, struct nlmsghdr
*n
, u32 classid
,
691 struct Qdisc
*new, struct Qdisc
*old
)
693 struct Qdisc
*q
= old
;
694 struct net
*net
= dev_net(dev
);
697 if (parent
== NULL
) {
698 unsigned int i
, num_q
, ingress
;
701 num_q
= dev
->num_tx_queues
;
702 if ((q
&& q
->flags
& TCQ_F_INGRESS
) ||
703 (new && new->flags
& TCQ_F_INGRESS
)) {
706 if (!dev_ingress_queue(dev
))
710 if (dev
->flags
& IFF_UP
)
713 if (new && new->ops
->attach
) {
714 new->ops
->attach(new);
718 for (i
= 0; i
< num_q
; i
++) {
719 struct netdev_queue
*dev_queue
= dev_ingress_queue(dev
);
722 dev_queue
= netdev_get_tx_queue(dev
, i
);
724 old
= dev_graft_qdisc(dev_queue
, new);
726 atomic_inc(&new->refcnt
);
733 notify_and_destroy(net
, skb
, n
, classid
,
735 if (new && !new->ops
->attach
)
736 atomic_inc(&new->refcnt
);
737 dev
->qdisc
= new ? : &noop_qdisc
;
739 notify_and_destroy(net
, skb
, n
, classid
, old
, new);
742 if (dev
->flags
& IFF_UP
)
745 const struct Qdisc_class_ops
*cops
= parent
->ops
->cl_ops
;
748 if (cops
&& cops
->graft
) {
749 unsigned long cl
= cops
->get(parent
, classid
);
751 err
= cops
->graft(parent
, cl
, new, &old
);
752 cops
->put(parent
, cl
);
757 notify_and_destroy(net
, skb
, n
, classid
, old
, new);
762 /* lockdep annotation is needed for ingress; egress gets it only for name */
763 static struct lock_class_key qdisc_tx_lock
;
764 static struct lock_class_key qdisc_rx_lock
;
767 Allocate and initialize new qdisc.
769 Parameters are passed via opt.
772 static struct Qdisc
*
773 qdisc_create(struct net_device
*dev
, struct netdev_queue
*dev_queue
,
774 struct Qdisc
*p
, u32 parent
, u32 handle
,
775 struct nlattr
**tca
, int *errp
)
778 struct nlattr
*kind
= tca
[TCA_KIND
];
780 struct Qdisc_ops
*ops
;
781 struct qdisc_size_table
*stab
;
783 ops
= qdisc_lookup_ops(kind
);
784 #ifdef CONFIG_MODULES
785 if (ops
== NULL
&& kind
!= NULL
) {
787 if (nla_strlcpy(name
, kind
, IFNAMSIZ
) < IFNAMSIZ
) {
788 /* We dropped the RTNL semaphore in order to
789 * perform the module load. So, even if we
790 * succeeded in loading the module we have to
791 * tell the caller to replay the request. We
792 * indicate this using -EAGAIN.
793 * We replay the request because the device may
794 * go away in the mean time.
797 request_module("sch_%s", name
);
799 ops
= qdisc_lookup_ops(kind
);
801 /* We will try again qdisc_lookup_ops,
802 * so don't keep a reference.
804 module_put(ops
->owner
);
816 sch
= qdisc_alloc(dev_queue
, ops
);
822 sch
->parent
= parent
;
824 if (handle
== TC_H_INGRESS
) {
825 sch
->flags
|= TCQ_F_INGRESS
;
826 handle
= TC_H_MAKE(TC_H_INGRESS
, 0);
827 lockdep_set_class(qdisc_lock(sch
), &qdisc_rx_lock
);
830 handle
= qdisc_alloc_handle(dev
);
835 lockdep_set_class(qdisc_lock(sch
), &qdisc_tx_lock
);
838 sch
->handle
= handle
;
840 if (!ops
->init
|| (err
= ops
->init(sch
, tca
[TCA_OPTIONS
])) == 0) {
842 stab
= qdisc_get_stab(tca
[TCA_STAB
]);
847 rcu_assign_pointer(sch
->stab
, stab
);
850 spinlock_t
*root_lock
;
853 if (sch
->flags
& TCQ_F_MQROOT
)
856 if ((sch
->parent
!= TC_H_ROOT
) &&
857 !(sch
->flags
& TCQ_F_INGRESS
) &&
858 (!p
|| !(p
->flags
& TCQ_F_MQROOT
)))
859 root_lock
= qdisc_root_sleeping_lock(sch
);
861 root_lock
= qdisc_lock(sch
);
863 err
= gen_new_estimator(&sch
->bstats
, &sch
->rate_est
,
864 root_lock
, tca
[TCA_RATE
]);
875 kfree((char *) sch
- sch
->padded
);
877 module_put(ops
->owner
);
884 * Any broken qdiscs that would require a ops->reset() here?
885 * The qdisc was never in action so it shouldn't be necessary.
887 qdisc_put_stab(rtnl_dereference(sch
->stab
));
893 static int qdisc_change(struct Qdisc
*sch
, struct nlattr
**tca
)
895 struct qdisc_size_table
*ostab
, *stab
= NULL
;
898 if (tca
[TCA_OPTIONS
]) {
899 if (sch
->ops
->change
== NULL
)
901 err
= sch
->ops
->change(sch
, tca
[TCA_OPTIONS
]);
907 stab
= qdisc_get_stab(tca
[TCA_STAB
]);
909 return PTR_ERR(stab
);
912 ostab
= rtnl_dereference(sch
->stab
);
913 rcu_assign_pointer(sch
->stab
, stab
);
914 qdisc_put_stab(ostab
);
917 /* NB: ignores errors from replace_estimator
918 because change can't be undone. */
919 if (sch
->flags
& TCQ_F_MQROOT
)
921 gen_replace_estimator(&sch
->bstats
, &sch
->rate_est
,
922 qdisc_root_sleeping_lock(sch
),
929 struct check_loop_arg
{
930 struct qdisc_walker w
;
935 static int check_loop_fn(struct Qdisc
*q
, unsigned long cl
, struct qdisc_walker
*w
);
937 static int check_loop(struct Qdisc
*q
, struct Qdisc
*p
, int depth
)
939 struct check_loop_arg arg
;
941 if (q
->ops
->cl_ops
== NULL
)
944 arg
.w
.stop
= arg
.w
.skip
= arg
.w
.count
= 0;
945 arg
.w
.fn
= check_loop_fn
;
948 q
->ops
->cl_ops
->walk(q
, &arg
.w
);
949 return arg
.w
.stop
? -ELOOP
: 0;
953 check_loop_fn(struct Qdisc
*q
, unsigned long cl
, struct qdisc_walker
*w
)
956 const struct Qdisc_class_ops
*cops
= q
->ops
->cl_ops
;
957 struct check_loop_arg
*arg
= (struct check_loop_arg
*)w
;
959 leaf
= cops
->leaf(q
, cl
);
961 if (leaf
== arg
->p
|| arg
->depth
> 7)
963 return check_loop(leaf
, arg
->p
, arg
->depth
+ 1);
972 static int tc_get_qdisc(struct sk_buff
*skb
, struct nlmsghdr
*n
, void *arg
)
974 struct net
*net
= sock_net(skb
->sk
);
975 struct tcmsg
*tcm
= nlmsg_data(n
);
976 struct nlattr
*tca
[TCA_MAX
+ 1];
977 struct net_device
*dev
;
978 u32 clid
= tcm
->tcm_parent
;
979 struct Qdisc
*q
= NULL
;
980 struct Qdisc
*p
= NULL
;
983 dev
= __dev_get_by_index(net
, tcm
->tcm_ifindex
);
987 err
= nlmsg_parse(n
, sizeof(*tcm
), tca
, TCA_MAX
, NULL
);
992 if (clid
!= TC_H_ROOT
) {
993 if (TC_H_MAJ(clid
) != TC_H_MAJ(TC_H_INGRESS
)) {
994 p
= qdisc_lookup(dev
, TC_H_MAJ(clid
));
997 q
= qdisc_leaf(p
, clid
);
998 } else if (dev_ingress_queue(dev
)) {
999 q
= dev_ingress_queue(dev
)->qdisc_sleeping
;
1007 if (tcm
->tcm_handle
&& q
->handle
!= tcm
->tcm_handle
)
1010 q
= qdisc_lookup(dev
, tcm
->tcm_handle
);
1015 if (tca
[TCA_KIND
] && nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))
1018 if (n
->nlmsg_type
== RTM_DELQDISC
) {
1023 err
= qdisc_graft(dev
, p
, skb
, n
, clid
, NULL
, q
);
1027 qdisc_notify(net
, skb
, n
, clid
, NULL
, q
);
1033 * Create/change qdisc.
1036 static int tc_modify_qdisc(struct sk_buff
*skb
, struct nlmsghdr
*n
, void *arg
)
1038 struct net
*net
= sock_net(skb
->sk
);
1040 struct nlattr
*tca
[TCA_MAX
+ 1];
1041 struct net_device
*dev
;
1043 struct Qdisc
*q
, *p
;
1047 /* Reinit, just in case something touches this. */
1048 tcm
= nlmsg_data(n
);
1049 clid
= tcm
->tcm_parent
;
1052 dev
= __dev_get_by_index(net
, tcm
->tcm_ifindex
);
1056 err
= nlmsg_parse(n
, sizeof(*tcm
), tca
, TCA_MAX
, NULL
);
1061 if (clid
!= TC_H_ROOT
) {
1062 if (clid
!= TC_H_INGRESS
) {
1063 p
= qdisc_lookup(dev
, TC_H_MAJ(clid
));
1066 q
= qdisc_leaf(p
, clid
);
1067 } else if (dev_ingress_queue_create(dev
)) {
1068 q
= dev_ingress_queue(dev
)->qdisc_sleeping
;
1074 /* It may be default qdisc, ignore it */
1075 if (q
&& q
->handle
== 0)
1078 if (!q
|| !tcm
->tcm_handle
|| q
->handle
!= tcm
->tcm_handle
) {
1079 if (tcm
->tcm_handle
) {
1080 if (q
&& !(n
->nlmsg_flags
& NLM_F_REPLACE
))
1082 if (TC_H_MIN(tcm
->tcm_handle
))
1084 q
= qdisc_lookup(dev
, tcm
->tcm_handle
);
1086 goto create_n_graft
;
1087 if (n
->nlmsg_flags
& NLM_F_EXCL
)
1089 if (tca
[TCA_KIND
] && nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))
1092 (p
&& check_loop(q
, p
, 0)))
1094 atomic_inc(&q
->refcnt
);
1098 goto create_n_graft
;
1100 /* This magic test requires explanation.
1102 * We know, that some child q is already
1103 * attached to this parent and have choice:
1104 * either to change it or to create/graft new one.
1106 * 1. We are allowed to create/graft only
1107 * if CREATE and REPLACE flags are set.
1109 * 2. If EXCL is set, requestor wanted to say,
1110 * that qdisc tcm_handle is not expected
1111 * to exist, so that we choose create/graft too.
1113 * 3. The last case is when no flags are set.
1114 * Alas, it is sort of hole in API, we
1115 * cannot decide what to do unambiguously.
1116 * For now we select create/graft, if
1117 * user gave KIND, which does not match existing.
1119 if ((n
->nlmsg_flags
& NLM_F_CREATE
) &&
1120 (n
->nlmsg_flags
& NLM_F_REPLACE
) &&
1121 ((n
->nlmsg_flags
& NLM_F_EXCL
) ||
1123 nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))))
1124 goto create_n_graft
;
1128 if (!tcm
->tcm_handle
)
1130 q
= qdisc_lookup(dev
, tcm
->tcm_handle
);
1133 /* Change qdisc parameters */
1136 if (n
->nlmsg_flags
& NLM_F_EXCL
)
1138 if (tca
[TCA_KIND
] && nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))
1140 err
= qdisc_change(q
, tca
);
1142 qdisc_notify(net
, skb
, n
, clid
, NULL
, q
);
1146 if (!(n
->nlmsg_flags
& NLM_F_CREATE
))
1148 if (clid
== TC_H_INGRESS
) {
1149 if (dev_ingress_queue(dev
))
1150 q
= qdisc_create(dev
, dev_ingress_queue(dev
), p
,
1151 tcm
->tcm_parent
, tcm
->tcm_parent
,
1156 struct netdev_queue
*dev_queue
;
1158 if (p
&& p
->ops
->cl_ops
&& p
->ops
->cl_ops
->select_queue
)
1159 dev_queue
= p
->ops
->cl_ops
->select_queue(p
, tcm
);
1161 dev_queue
= p
->dev_queue
;
1163 dev_queue
= netdev_get_tx_queue(dev
, 0);
1165 q
= qdisc_create(dev
, dev_queue
, p
,
1166 tcm
->tcm_parent
, tcm
->tcm_handle
,
1176 err
= qdisc_graft(dev
, p
, skb
, n
, clid
, q
, NULL
);
1186 static int tc_fill_qdisc(struct sk_buff
*skb
, struct Qdisc
*q
, u32 clid
,
1187 u32 portid
, u32 seq
, u16 flags
, int event
)
1190 struct nlmsghdr
*nlh
;
1191 unsigned char *b
= skb_tail_pointer(skb
);
1193 struct qdisc_size_table
*stab
;
1195 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*tcm
), flags
);
1197 goto out_nlmsg_trim
;
1198 tcm
= nlmsg_data(nlh
);
1199 tcm
->tcm_family
= AF_UNSPEC
;
1202 tcm
->tcm_ifindex
= qdisc_dev(q
)->ifindex
;
1203 tcm
->tcm_parent
= clid
;
1204 tcm
->tcm_handle
= q
->handle
;
1205 tcm
->tcm_info
= atomic_read(&q
->refcnt
);
1206 if (nla_put_string(skb
, TCA_KIND
, q
->ops
->id
))
1207 goto nla_put_failure
;
1208 if (q
->ops
->dump
&& q
->ops
->dump(q
, skb
) < 0)
1209 goto nla_put_failure
;
1210 q
->qstats
.qlen
= q
->q
.qlen
;
1212 stab
= rtnl_dereference(q
->stab
);
1213 if (stab
&& qdisc_dump_stab(skb
, stab
) < 0)
1214 goto nla_put_failure
;
1216 if (gnet_stats_start_copy_compat(skb
, TCA_STATS2
, TCA_STATS
, TCA_XSTATS
,
1217 qdisc_root_sleeping_lock(q
), &d
) < 0)
1218 goto nla_put_failure
;
1220 if (q
->ops
->dump_stats
&& q
->ops
->dump_stats(q
, &d
) < 0)
1221 goto nla_put_failure
;
1223 if (gnet_stats_copy_basic(&d
, &q
->bstats
) < 0 ||
1224 gnet_stats_copy_rate_est(&d
, &q
->bstats
, &q
->rate_est
) < 0 ||
1225 gnet_stats_copy_queue(&d
, &q
->qstats
) < 0)
1226 goto nla_put_failure
;
1228 if (gnet_stats_finish_copy(&d
) < 0)
1229 goto nla_put_failure
;
1231 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
1240 static bool tc_qdisc_dump_ignore(struct Qdisc
*q
)
1242 return (q
->flags
& TCQ_F_BUILTIN
) ? true : false;
1245 static int qdisc_notify(struct net
*net
, struct sk_buff
*oskb
,
1246 struct nlmsghdr
*n
, u32 clid
,
1247 struct Qdisc
*old
, struct Qdisc
*new)
1249 struct sk_buff
*skb
;
1250 u32 portid
= oskb
? NETLINK_CB(oskb
).portid
: 0;
1252 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1256 if (old
&& !tc_qdisc_dump_ignore(old
)) {
1257 if (tc_fill_qdisc(skb
, old
, clid
, portid
, n
->nlmsg_seq
,
1258 0, RTM_DELQDISC
) < 0)
1261 if (new && !tc_qdisc_dump_ignore(new)) {
1262 if (tc_fill_qdisc(skb
, new, clid
, portid
, n
->nlmsg_seq
,
1263 old
? NLM_F_REPLACE
: 0, RTM_NEWQDISC
) < 0)
1268 return rtnetlink_send(skb
, net
, portid
, RTNLGRP_TC
,
1269 n
->nlmsg_flags
& NLM_F_ECHO
);
1276 static int tc_dump_qdisc_root(struct Qdisc
*root
, struct sk_buff
*skb
,
1277 struct netlink_callback
*cb
,
1278 int *q_idx_p
, int s_q_idx
)
1280 int ret
= 0, q_idx
= *q_idx_p
;
1287 if (q_idx
< s_q_idx
) {
1290 if (!tc_qdisc_dump_ignore(q
) &&
1291 tc_fill_qdisc(skb
, q
, q
->parent
, NETLINK_CB(cb
->skb
).portid
,
1292 cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
, RTM_NEWQDISC
) <= 0)
1296 list_for_each_entry(q
, &root
->list
, list
) {
1297 if (q_idx
< s_q_idx
) {
1301 if (!tc_qdisc_dump_ignore(q
) &&
1302 tc_fill_qdisc(skb
, q
, q
->parent
, NETLINK_CB(cb
->skb
).portid
,
1303 cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
, RTM_NEWQDISC
) <= 0)
1316 static int tc_dump_qdisc(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1318 struct net
*net
= sock_net(skb
->sk
);
1321 struct net_device
*dev
;
1323 s_idx
= cb
->args
[0];
1324 s_q_idx
= q_idx
= cb
->args
[1];
1328 for_each_netdev_rcu(net
, dev
) {
1329 struct netdev_queue
*dev_queue
;
1337 if (tc_dump_qdisc_root(dev
->qdisc
, skb
, cb
, &q_idx
, s_q_idx
) < 0)
1340 dev_queue
= dev_ingress_queue(dev
);
1342 tc_dump_qdisc_root(dev_queue
->qdisc_sleeping
, skb
, cb
,
1343 &q_idx
, s_q_idx
) < 0)
1354 cb
->args
[1] = q_idx
;
1361 /************************************************
1362 * Traffic classes manipulation. *
1363 ************************************************/
1367 static int tc_ctl_tclass(struct sk_buff
*skb
, struct nlmsghdr
*n
, void *arg
)
1369 struct net
*net
= sock_net(skb
->sk
);
1370 struct tcmsg
*tcm
= nlmsg_data(n
);
1371 struct nlattr
*tca
[TCA_MAX
+ 1];
1372 struct net_device
*dev
;
1373 struct Qdisc
*q
= NULL
;
1374 const struct Qdisc_class_ops
*cops
;
1375 unsigned long cl
= 0;
1376 unsigned long new_cl
;
1377 u32 portid
= tcm
->tcm_parent
;
1378 u32 clid
= tcm
->tcm_handle
;
1379 u32 qid
= TC_H_MAJ(clid
);
1382 dev
= __dev_get_by_index(net
, tcm
->tcm_ifindex
);
1386 err
= nlmsg_parse(n
, sizeof(*tcm
), tca
, TCA_MAX
, NULL
);
1391 parent == TC_H_UNSPEC - unspecified parent.
1392 parent == TC_H_ROOT - class is root, which has no parent.
1393 parent == X:0 - parent is root class.
1394 parent == X:Y - parent is a node in hierarchy.
1395 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1397 handle == 0:0 - generate handle from kernel pool.
1398 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1399 handle == X:Y - clear.
1400 handle == X:0 - root class.
1403 /* Step 1. Determine qdisc handle X:0 */
1405 if (portid
!= TC_H_ROOT
) {
1406 u32 qid1
= TC_H_MAJ(portid
);
1409 /* If both majors are known, they must be identical. */
1414 } else if (qid
== 0)
1415 qid
= dev
->qdisc
->handle
;
1417 /* Now qid is genuine qdisc handle consistent
1418 * both with parent and child.
1420 * TC_H_MAJ(portid) still may be unspecified, complete it now.
1423 portid
= TC_H_MAKE(qid
, portid
);
1426 qid
= dev
->qdisc
->handle
;
1429 /* OK. Locate qdisc */
1430 q
= qdisc_lookup(dev
, qid
);
1434 /* An check that it supports classes */
1435 cops
= q
->ops
->cl_ops
;
1439 /* Now try to get class */
1441 if (portid
== TC_H_ROOT
)
1444 clid
= TC_H_MAKE(qid
, clid
);
1447 cl
= cops
->get(q
, clid
);
1451 if (n
->nlmsg_type
!= RTM_NEWTCLASS
||
1452 !(n
->nlmsg_flags
& NLM_F_CREATE
))
1455 switch (n
->nlmsg_type
) {
1458 if (n
->nlmsg_flags
& NLM_F_EXCL
)
1464 err
= cops
->delete(q
, cl
);
1466 tclass_notify(net
, skb
, n
, q
, cl
, RTM_DELTCLASS
);
1469 err
= tclass_notify(net
, skb
, n
, q
, cl
, RTM_NEWTCLASS
);
1480 err
= cops
->change(q
, clid
, portid
, tca
, &new_cl
);
1482 tclass_notify(net
, skb
, n
, q
, new_cl
, RTM_NEWTCLASS
);
1492 static int tc_fill_tclass(struct sk_buff
*skb
, struct Qdisc
*q
,
1494 u32 portid
, u32 seq
, u16 flags
, int event
)
1497 struct nlmsghdr
*nlh
;
1498 unsigned char *b
= skb_tail_pointer(skb
);
1500 const struct Qdisc_class_ops
*cl_ops
= q
->ops
->cl_ops
;
1502 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*tcm
), flags
);
1504 goto out_nlmsg_trim
;
1505 tcm
= nlmsg_data(nlh
);
1506 tcm
->tcm_family
= AF_UNSPEC
;
1509 tcm
->tcm_ifindex
= qdisc_dev(q
)->ifindex
;
1510 tcm
->tcm_parent
= q
->handle
;
1511 tcm
->tcm_handle
= q
->handle
;
1513 if (nla_put_string(skb
, TCA_KIND
, q
->ops
->id
))
1514 goto nla_put_failure
;
1515 if (cl_ops
->dump
&& cl_ops
->dump(q
, cl
, skb
, tcm
) < 0)
1516 goto nla_put_failure
;
1518 if (gnet_stats_start_copy_compat(skb
, TCA_STATS2
, TCA_STATS
, TCA_XSTATS
,
1519 qdisc_root_sleeping_lock(q
), &d
) < 0)
1520 goto nla_put_failure
;
1522 if (cl_ops
->dump_stats
&& cl_ops
->dump_stats(q
, cl
, &d
) < 0)
1523 goto nla_put_failure
;
1525 if (gnet_stats_finish_copy(&d
) < 0)
1526 goto nla_put_failure
;
1528 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
1537 static int tclass_notify(struct net
*net
, struct sk_buff
*oskb
,
1538 struct nlmsghdr
*n
, struct Qdisc
*q
,
1539 unsigned long cl
, int event
)
1541 struct sk_buff
*skb
;
1542 u32 portid
= oskb
? NETLINK_CB(oskb
).portid
: 0;
1544 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1548 if (tc_fill_tclass(skb
, q
, cl
, portid
, n
->nlmsg_seq
, 0, event
) < 0) {
1553 return rtnetlink_send(skb
, net
, portid
, RTNLGRP_TC
,
1554 n
->nlmsg_flags
& NLM_F_ECHO
);
1557 struct qdisc_dump_args
{
1558 struct qdisc_walker w
;
1559 struct sk_buff
*skb
;
1560 struct netlink_callback
*cb
;
1563 static int qdisc_class_dump(struct Qdisc
*q
, unsigned long cl
, struct qdisc_walker
*arg
)
1565 struct qdisc_dump_args
*a
= (struct qdisc_dump_args
*)arg
;
1567 return tc_fill_tclass(a
->skb
, q
, cl
, NETLINK_CB(a
->cb
->skb
).portid
,
1568 a
->cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
, RTM_NEWTCLASS
);
1571 static int tc_dump_tclass_qdisc(struct Qdisc
*q
, struct sk_buff
*skb
,
1572 struct tcmsg
*tcm
, struct netlink_callback
*cb
,
1575 struct qdisc_dump_args arg
;
1577 if (tc_qdisc_dump_ignore(q
) ||
1578 *t_p
< s_t
|| !q
->ops
->cl_ops
||
1580 TC_H_MAJ(tcm
->tcm_parent
) != q
->handle
)) {
1585 memset(&cb
->args
[1], 0, sizeof(cb
->args
)-sizeof(cb
->args
[0]));
1586 arg
.w
.fn
= qdisc_class_dump
;
1590 arg
.w
.skip
= cb
->args
[1];
1592 q
->ops
->cl_ops
->walk(q
, &arg
.w
);
1593 cb
->args
[1] = arg
.w
.count
;
1600 static int tc_dump_tclass_root(struct Qdisc
*root
, struct sk_buff
*skb
,
1601 struct tcmsg
*tcm
, struct netlink_callback
*cb
,
1609 if (tc_dump_tclass_qdisc(root
, skb
, tcm
, cb
, t_p
, s_t
) < 0)
1612 list_for_each_entry(q
, &root
->list
, list
) {
1613 if (tc_dump_tclass_qdisc(q
, skb
, tcm
, cb
, t_p
, s_t
) < 0)
1620 static int tc_dump_tclass(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1622 struct tcmsg
*tcm
= nlmsg_data(cb
->nlh
);
1623 struct net
*net
= sock_net(skb
->sk
);
1624 struct netdev_queue
*dev_queue
;
1625 struct net_device
*dev
;
1628 if (cb
->nlh
->nlmsg_len
< NLMSG_LENGTH(sizeof(*tcm
)))
1630 dev
= dev_get_by_index(net
, tcm
->tcm_ifindex
);
1637 if (tc_dump_tclass_root(dev
->qdisc
, skb
, tcm
, cb
, &t
, s_t
) < 0)
1640 dev_queue
= dev_ingress_queue(dev
);
1642 tc_dump_tclass_root(dev_queue
->qdisc_sleeping
, skb
, tcm
, cb
,
1653 /* Main classifier routine: scans classifier chain attached
1654 * to this qdisc, (optionally) tests for protocol and asks
1655 * specific classifiers.
1657 int tc_classify_compat(struct sk_buff
*skb
, const struct tcf_proto
*tp
,
1658 struct tcf_result
*res
)
1660 __be16 protocol
= skb
->protocol
;
1663 for (; tp
; tp
= tp
->next
) {
1664 if (tp
->protocol
!= protocol
&&
1665 tp
->protocol
!= htons(ETH_P_ALL
))
1667 err
= tp
->classify(skb
, tp
, res
);
1670 #ifdef CONFIG_NET_CLS_ACT
1671 if (err
!= TC_ACT_RECLASSIFY
&& skb
->tc_verd
)
1672 skb
->tc_verd
= SET_TC_VERD(skb
->tc_verd
, 0);
1679 EXPORT_SYMBOL(tc_classify_compat
);
1681 int tc_classify(struct sk_buff
*skb
, const struct tcf_proto
*tp
,
1682 struct tcf_result
*res
)
1685 #ifdef CONFIG_NET_CLS_ACT
1686 const struct tcf_proto
*otp
= tp
;
1690 err
= tc_classify_compat(skb
, tp
, res
);
1691 #ifdef CONFIG_NET_CLS_ACT
1692 if (err
== TC_ACT_RECLASSIFY
) {
1693 u32 verd
= G_TC_VERD(skb
->tc_verd
);
1696 if (verd
++ >= MAX_REC_LOOP
) {
1697 net_notice_ratelimited("%s: packet reclassify loop rule prio %u protocol %02x\n",
1700 ntohs(tp
->protocol
));
1703 skb
->tc_verd
= SET_TC_VERD(skb
->tc_verd
, verd
);
1709 EXPORT_SYMBOL(tc_classify
);
1711 void tcf_destroy(struct tcf_proto
*tp
)
1713 tp
->ops
->destroy(tp
);
1714 module_put(tp
->ops
->owner
);
1718 void tcf_destroy_chain(struct tcf_proto
**fl
)
1720 struct tcf_proto
*tp
;
1722 while ((tp
= *fl
) != NULL
) {
1727 EXPORT_SYMBOL(tcf_destroy_chain
);
1729 #ifdef CONFIG_PROC_FS
1730 static int psched_show(struct seq_file
*seq
, void *v
)
1734 hrtimer_get_res(CLOCK_MONOTONIC
, &ts
);
1735 seq_printf(seq
, "%08x %08x %08x %08x\n",
1736 (u32
)NSEC_PER_USEC
, (u32
)PSCHED_TICKS2NS(1),
1738 (u32
)NSEC_PER_SEC
/(u32
)ktime_to_ns(timespec_to_ktime(ts
)));
1743 static int psched_open(struct inode
*inode
, struct file
*file
)
1745 return single_open(file
, psched_show
, NULL
);
1748 static const struct file_operations psched_fops
= {
1749 .owner
= THIS_MODULE
,
1750 .open
= psched_open
,
1752 .llseek
= seq_lseek
,
1753 .release
= single_release
,
1756 static int __net_init
psched_net_init(struct net
*net
)
1758 struct proc_dir_entry
*e
;
1760 e
= proc_net_fops_create(net
, "psched", 0, &psched_fops
);
1767 static void __net_exit
psched_net_exit(struct net
*net
)
1769 proc_net_remove(net
, "psched");
1772 static int __net_init
psched_net_init(struct net
*net
)
1777 static void __net_exit
psched_net_exit(struct net
*net
)
1782 static struct pernet_operations psched_net_ops
= {
1783 .init
= psched_net_init
,
1784 .exit
= psched_net_exit
,
1787 static int __init
pktsched_init(void)
1791 err
= register_pernet_subsys(&psched_net_ops
);
1793 pr_err("pktsched_init: "
1794 "cannot initialize per netns operations\n");
1798 register_qdisc(&pfifo_qdisc_ops
);
1799 register_qdisc(&bfifo_qdisc_ops
);
1800 register_qdisc(&pfifo_head_drop_qdisc_ops
);
1801 register_qdisc(&mq_qdisc_ops
);
1803 rtnl_register(PF_UNSPEC
, RTM_NEWQDISC
, tc_modify_qdisc
, NULL
, NULL
);
1804 rtnl_register(PF_UNSPEC
, RTM_DELQDISC
, tc_get_qdisc
, NULL
, NULL
);
1805 rtnl_register(PF_UNSPEC
, RTM_GETQDISC
, tc_get_qdisc
, tc_dump_qdisc
, NULL
);
1806 rtnl_register(PF_UNSPEC
, RTM_NEWTCLASS
, tc_ctl_tclass
, NULL
, NULL
);
1807 rtnl_register(PF_UNSPEC
, RTM_DELTCLASS
, tc_ctl_tclass
, NULL
, NULL
);
1808 rtnl_register(PF_UNSPEC
, RTM_GETTCLASS
, tc_ctl_tclass
, tc_dump_tclass
, NULL
);
1813 subsys_initcall(pktsched_init
);