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>
32 #include <linux/hashtable.h>
34 #include <net/net_namespace.h>
36 #include <net/netlink.h>
37 #include <net/pkt_sched.h>
39 static int qdisc_notify(struct net
*net
, struct sk_buff
*oskb
,
40 struct nlmsghdr
*n
, u32 clid
,
41 struct Qdisc
*old
, struct Qdisc
*new);
42 static int tclass_notify(struct net
*net
, struct sk_buff
*oskb
,
43 struct nlmsghdr
*n
, struct Qdisc
*q
,
44 unsigned long cl
, int event
);
51 This file consists of two interrelated parts:
53 1. queueing disciplines manager frontend.
54 2. traffic classes manager frontend.
56 Generally, queueing discipline ("qdisc") is a black box,
57 which is able to enqueue packets and to dequeue them (when
58 device is ready to send something) in order and at times
59 determined by algorithm hidden in it.
61 qdisc's are divided to two categories:
62 - "queues", which have no internal structure visible from outside.
63 - "schedulers", which split all the packets to "traffic classes",
64 using "packet classifiers" (look at cls_api.c)
66 In turn, classes may have child qdiscs (as rule, queues)
67 attached to them etc. etc. etc.
69 The goal of the routines in this file is to translate
70 information supplied by user in the form of handles
71 to more intelligible for kernel form, to make some sanity
72 checks and part of work, which is common to all qdiscs
73 and to provide rtnetlink notifications.
75 All real intelligent work is done inside qdisc modules.
79 Every discipline has two major routines: enqueue and dequeue.
83 dequeue usually returns a skb to send. It is allowed to return NULL,
84 but it does not mean that queue is empty, it just means that
85 discipline does not want to send anything this time.
86 Queue is really empty if q->q.qlen == 0.
87 For complicated disciplines with multiple queues q->q is not
88 real packet queue, but however q->q.qlen must be valid.
92 enqueue returns 0, if packet was enqueued successfully.
93 If packet (this one or another one) was dropped, it returns
95 NET_XMIT_DROP - this packet dropped
96 Expected action: do not backoff, but wait until queue will clear.
97 NET_XMIT_CN - probably this packet enqueued, but another one dropped.
98 Expected action: backoff or ignore
104 like dequeue but without removing a packet from the queue
108 returns qdisc to initial state: purge all buffers, clear all
109 timers, counters (except for statistics) etc.
113 initializes newly created qdisc.
117 destroys resources allocated by init and during lifetime of qdisc.
121 changes qdisc parameters.
124 /* Protects list of registered TC modules. It is pure SMP lock. */
125 static DEFINE_RWLOCK(qdisc_mod_lock
);
128 /************************************************
129 * Queueing disciplines manipulation. *
130 ************************************************/
133 /* The list of all installed queueing disciplines. */
135 static struct Qdisc_ops
*qdisc_base
;
137 /* Register/unregister queueing discipline */
139 int register_qdisc(struct Qdisc_ops
*qops
)
141 struct Qdisc_ops
*q
, **qp
;
144 write_lock(&qdisc_mod_lock
);
145 for (qp
= &qdisc_base
; (q
= *qp
) != NULL
; qp
= &q
->next
)
146 if (!strcmp(qops
->id
, q
->id
))
149 if (qops
->enqueue
== NULL
)
150 qops
->enqueue
= noop_qdisc_ops
.enqueue
;
151 if (qops
->peek
== NULL
) {
152 if (qops
->dequeue
== NULL
)
153 qops
->peek
= noop_qdisc_ops
.peek
;
157 if (qops
->dequeue
== NULL
)
158 qops
->dequeue
= noop_qdisc_ops
.dequeue
;
161 const struct Qdisc_class_ops
*cops
= qops
->cl_ops
;
163 if (!(cops
->get
&& cops
->put
&& cops
->walk
&& cops
->leaf
))
166 if (cops
->tcf_chain
&& !(cops
->bind_tcf
&& cops
->unbind_tcf
))
174 write_unlock(&qdisc_mod_lock
);
181 EXPORT_SYMBOL(register_qdisc
);
183 int unregister_qdisc(struct Qdisc_ops
*qops
)
185 struct Qdisc_ops
*q
, **qp
;
188 write_lock(&qdisc_mod_lock
);
189 for (qp
= &qdisc_base
; (q
= *qp
) != NULL
; qp
= &q
->next
)
197 write_unlock(&qdisc_mod_lock
);
200 EXPORT_SYMBOL(unregister_qdisc
);
202 /* Get default qdisc if not otherwise specified */
203 void qdisc_get_default(char *name
, size_t len
)
205 read_lock(&qdisc_mod_lock
);
206 strlcpy(name
, default_qdisc_ops
->id
, len
);
207 read_unlock(&qdisc_mod_lock
);
210 static struct Qdisc_ops
*qdisc_lookup_default(const char *name
)
212 struct Qdisc_ops
*q
= NULL
;
214 for (q
= qdisc_base
; q
; q
= q
->next
) {
215 if (!strcmp(name
, q
->id
)) {
216 if (!try_module_get(q
->owner
))
225 /* Set new default qdisc to use */
226 int qdisc_set_default(const char *name
)
228 const struct Qdisc_ops
*ops
;
230 if (!capable(CAP_NET_ADMIN
))
233 write_lock(&qdisc_mod_lock
);
234 ops
= qdisc_lookup_default(name
);
236 /* Not found, drop lock and try to load module */
237 write_unlock(&qdisc_mod_lock
);
238 request_module("sch_%s", name
);
239 write_lock(&qdisc_mod_lock
);
241 ops
= qdisc_lookup_default(name
);
245 /* Set new default */
246 module_put(default_qdisc_ops
->owner
);
247 default_qdisc_ops
= ops
;
249 write_unlock(&qdisc_mod_lock
);
251 return ops
? 0 : -ENOENT
;
254 /* We know handle. Find qdisc among all qdisc's attached to device
255 * (root qdisc, all its children, children of children etc.)
256 * Note: caller either uses rtnl or rcu_read_lock()
259 static struct Qdisc
*qdisc_match_from_root(struct Qdisc
*root
, u32 handle
)
263 if (!qdisc_dev(root
))
264 return (root
->handle
== handle
? root
: NULL
);
266 if (!(root
->flags
& TCQ_F_BUILTIN
) &&
267 root
->handle
== handle
)
270 hash_for_each_possible_rcu(qdisc_dev(root
)->qdisc_hash
, q
, hash
, handle
) {
271 if (q
->handle
== handle
)
277 void qdisc_hash_add(struct Qdisc
*q
, bool invisible
)
279 if ((q
->parent
!= TC_H_ROOT
) && !(q
->flags
& TCQ_F_INGRESS
)) {
280 struct Qdisc
*root
= qdisc_dev(q
)->qdisc
;
282 WARN_ON_ONCE(root
== &noop_qdisc
);
284 hash_add_rcu(qdisc_dev(q
)->qdisc_hash
, &q
->hash
, q
->handle
);
286 q
->flags
|= TCQ_F_INVISIBLE
;
289 EXPORT_SYMBOL(qdisc_hash_add
);
291 void qdisc_hash_del(struct Qdisc
*q
)
293 if ((q
->parent
!= TC_H_ROOT
) && !(q
->flags
& TCQ_F_INGRESS
)) {
295 hash_del_rcu(&q
->hash
);
298 EXPORT_SYMBOL(qdisc_hash_del
);
300 struct Qdisc
*qdisc_lookup(struct net_device
*dev
, u32 handle
)
304 q
= qdisc_match_from_root(dev
->qdisc
, handle
);
308 if (dev_ingress_queue(dev
))
309 q
= qdisc_match_from_root(
310 dev_ingress_queue(dev
)->qdisc_sleeping
,
316 static struct Qdisc
*qdisc_leaf(struct Qdisc
*p
, u32 classid
)
320 const struct Qdisc_class_ops
*cops
= p
->ops
->cl_ops
;
324 cl
= cops
->get(p
, classid
);
328 leaf
= cops
->leaf(p
, cl
);
333 /* Find queueing discipline by name */
335 static struct Qdisc_ops
*qdisc_lookup_ops(struct nlattr
*kind
)
337 struct Qdisc_ops
*q
= NULL
;
340 read_lock(&qdisc_mod_lock
);
341 for (q
= qdisc_base
; q
; q
= q
->next
) {
342 if (nla_strcmp(kind
, q
->id
) == 0) {
343 if (!try_module_get(q
->owner
))
348 read_unlock(&qdisc_mod_lock
);
353 /* The linklayer setting were not transferred from iproute2, in older
354 * versions, and the rate tables lookup systems have been dropped in
355 * the kernel. To keep backward compatible with older iproute2 tc
356 * utils, we detect the linklayer setting by detecting if the rate
357 * table were modified.
359 * For linklayer ATM table entries, the rate table will be aligned to
360 * 48 bytes, thus some table entries will contain the same value. The
361 * mpu (min packet unit) is also encoded into the old rate table, thus
362 * starting from the mpu, we find low and high table entries for
363 * mapping this cell. If these entries contain the same value, when
364 * the rate tables have been modified for linklayer ATM.
366 * This is done by rounding mpu to the nearest 48 bytes cell/entry,
367 * and then roundup to the next cell, calc the table entry one below,
370 static __u8
__detect_linklayer(struct tc_ratespec
*r
, __u32
*rtab
)
372 int low
= roundup(r
->mpu
, 48);
373 int high
= roundup(low
+1, 48);
374 int cell_low
= low
>> r
->cell_log
;
375 int cell_high
= (high
>> r
->cell_log
) - 1;
377 /* rtab is too inaccurate at rates > 100Mbit/s */
378 if ((r
->rate
> (100000000/8)) || (rtab
[0] == 0)) {
379 pr_debug("TC linklayer: Giving up ATM detection\n");
380 return TC_LINKLAYER_ETHERNET
;
383 if ((cell_high
> cell_low
) && (cell_high
< 256)
384 && (rtab
[cell_low
] == rtab
[cell_high
])) {
385 pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n",
386 cell_low
, cell_high
, rtab
[cell_high
]);
387 return TC_LINKLAYER_ATM
;
389 return TC_LINKLAYER_ETHERNET
;
392 static struct qdisc_rate_table
*qdisc_rtab_list
;
394 struct qdisc_rate_table
*qdisc_get_rtab(struct tc_ratespec
*r
,
397 struct qdisc_rate_table
*rtab
;
399 if (tab
== NULL
|| r
->rate
== 0 || r
->cell_log
== 0 ||
400 nla_len(tab
) != TC_RTAB_SIZE
)
403 for (rtab
= qdisc_rtab_list
; rtab
; rtab
= rtab
->next
) {
404 if (!memcmp(&rtab
->rate
, r
, sizeof(struct tc_ratespec
)) &&
405 !memcmp(&rtab
->data
, nla_data(tab
), 1024)) {
411 rtab
= kmalloc(sizeof(*rtab
), GFP_KERNEL
);
415 memcpy(rtab
->data
, nla_data(tab
), 1024);
416 if (r
->linklayer
== TC_LINKLAYER_UNAWARE
)
417 r
->linklayer
= __detect_linklayer(r
, rtab
->data
);
418 rtab
->next
= qdisc_rtab_list
;
419 qdisc_rtab_list
= rtab
;
423 EXPORT_SYMBOL(qdisc_get_rtab
);
425 void qdisc_put_rtab(struct qdisc_rate_table
*tab
)
427 struct qdisc_rate_table
*rtab
, **rtabp
;
429 if (!tab
|| --tab
->refcnt
)
432 for (rtabp
= &qdisc_rtab_list
;
433 (rtab
= *rtabp
) != NULL
;
434 rtabp
= &rtab
->next
) {
442 EXPORT_SYMBOL(qdisc_put_rtab
);
444 static LIST_HEAD(qdisc_stab_list
);
446 static const struct nla_policy stab_policy
[TCA_STAB_MAX
+ 1] = {
447 [TCA_STAB_BASE
] = { .len
= sizeof(struct tc_sizespec
) },
448 [TCA_STAB_DATA
] = { .type
= NLA_BINARY
},
451 static struct qdisc_size_table
*qdisc_get_stab(struct nlattr
*opt
)
453 struct nlattr
*tb
[TCA_STAB_MAX
+ 1];
454 struct qdisc_size_table
*stab
;
455 struct tc_sizespec
*s
;
456 unsigned int tsize
= 0;
460 err
= nla_parse_nested(tb
, TCA_STAB_MAX
, opt
, stab_policy
);
463 if (!tb
[TCA_STAB_BASE
])
464 return ERR_PTR(-EINVAL
);
466 s
= nla_data(tb
[TCA_STAB_BASE
]);
469 if (!tb
[TCA_STAB_DATA
])
470 return ERR_PTR(-EINVAL
);
471 tab
= nla_data(tb
[TCA_STAB_DATA
]);
472 tsize
= nla_len(tb
[TCA_STAB_DATA
]) / sizeof(u16
);
475 if (tsize
!= s
->tsize
|| (!tab
&& tsize
> 0))
476 return ERR_PTR(-EINVAL
);
478 list_for_each_entry(stab
, &qdisc_stab_list
, list
) {
479 if (memcmp(&stab
->szopts
, s
, sizeof(*s
)))
481 if (tsize
> 0 && memcmp(stab
->data
, tab
, tsize
* sizeof(u16
)))
487 stab
= kmalloc(sizeof(*stab
) + tsize
* sizeof(u16
), GFP_KERNEL
);
489 return ERR_PTR(-ENOMEM
);
494 memcpy(stab
->data
, tab
, tsize
* sizeof(u16
));
496 list_add_tail(&stab
->list
, &qdisc_stab_list
);
501 static void stab_kfree_rcu(struct rcu_head
*head
)
503 kfree(container_of(head
, struct qdisc_size_table
, rcu
));
506 void qdisc_put_stab(struct qdisc_size_table
*tab
)
511 if (--tab
->refcnt
== 0) {
512 list_del(&tab
->list
);
513 call_rcu_bh(&tab
->rcu
, stab_kfree_rcu
);
516 EXPORT_SYMBOL(qdisc_put_stab
);
518 static int qdisc_dump_stab(struct sk_buff
*skb
, struct qdisc_size_table
*stab
)
522 nest
= nla_nest_start(skb
, TCA_STAB
);
524 goto nla_put_failure
;
525 if (nla_put(skb
, TCA_STAB_BASE
, sizeof(stab
->szopts
), &stab
->szopts
))
526 goto nla_put_failure
;
527 nla_nest_end(skb
, nest
);
535 void __qdisc_calculate_pkt_len(struct sk_buff
*skb
,
536 const struct qdisc_size_table
*stab
)
540 pkt_len
= skb
->len
+ stab
->szopts
.overhead
;
541 if (unlikely(!stab
->szopts
.tsize
))
544 slot
= pkt_len
+ stab
->szopts
.cell_align
;
545 if (unlikely(slot
< 0))
548 slot
>>= stab
->szopts
.cell_log
;
549 if (likely(slot
< stab
->szopts
.tsize
))
550 pkt_len
= stab
->data
[slot
];
552 pkt_len
= stab
->data
[stab
->szopts
.tsize
- 1] *
553 (slot
/ stab
->szopts
.tsize
) +
554 stab
->data
[slot
% stab
->szopts
.tsize
];
556 pkt_len
<<= stab
->szopts
.size_log
;
558 if (unlikely(pkt_len
< 1))
560 qdisc_skb_cb(skb
)->pkt_len
= pkt_len
;
562 EXPORT_SYMBOL(__qdisc_calculate_pkt_len
);
564 void qdisc_warn_nonwc(const char *txt
, struct Qdisc
*qdisc
)
566 if (!(qdisc
->flags
& TCQ_F_WARN_NONWC
)) {
567 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
568 txt
, qdisc
->ops
->id
, qdisc
->handle
>> 16);
569 qdisc
->flags
|= TCQ_F_WARN_NONWC
;
572 EXPORT_SYMBOL(qdisc_warn_nonwc
);
574 static enum hrtimer_restart
qdisc_watchdog(struct hrtimer
*timer
)
576 struct qdisc_watchdog
*wd
= container_of(timer
, struct qdisc_watchdog
,
580 __netif_schedule(qdisc_root(wd
->qdisc
));
583 return HRTIMER_NORESTART
;
586 void qdisc_watchdog_init(struct qdisc_watchdog
*wd
, struct Qdisc
*qdisc
)
588 hrtimer_init(&wd
->timer
, CLOCK_MONOTONIC
, HRTIMER_MODE_ABS_PINNED
);
589 wd
->timer
.function
= qdisc_watchdog
;
592 EXPORT_SYMBOL(qdisc_watchdog_init
);
594 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog
*wd
, u64 expires
)
596 if (test_bit(__QDISC_STATE_DEACTIVATED
,
597 &qdisc_root_sleeping(wd
->qdisc
)->state
))
600 if (wd
->last_expires
== expires
)
603 wd
->last_expires
= expires
;
604 hrtimer_start(&wd
->timer
,
605 ns_to_ktime(expires
),
606 HRTIMER_MODE_ABS_PINNED
);
608 EXPORT_SYMBOL(qdisc_watchdog_schedule_ns
);
610 void qdisc_watchdog_cancel(struct qdisc_watchdog
*wd
)
612 hrtimer_cancel(&wd
->timer
);
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_reduce_backlog(struct Qdisc
*sch
, unsigned int n
,
743 const struct Qdisc_class_ops
*cops
;
748 if (n
== 0 && len
== 0)
750 drops
= max_t(int, n
, 0);
752 while ((parentid
= sch
->parent
)) {
753 if (TC_H_MAJ(parentid
) == TC_H_MAJ(TC_H_INGRESS
))
756 if (sch
->flags
& TCQ_F_NOPARENT
)
758 /* TODO: perform the search on a per txq basis */
759 sch
= qdisc_lookup(qdisc_dev(sch
), TC_H_MAJ(parentid
));
761 WARN_ON_ONCE(parentid
!= TC_H_ROOT
);
764 cops
= sch
->ops
->cl_ops
;
765 if (cops
->qlen_notify
) {
766 cl
= cops
->get(sch
, parentid
);
767 cops
->qlen_notify(sch
, cl
);
771 sch
->qstats
.backlog
-= len
;
772 __qdisc_qstats_drop(sch
, drops
);
776 EXPORT_SYMBOL(qdisc_tree_reduce_backlog
);
778 static void notify_and_destroy(struct net
*net
, struct sk_buff
*skb
,
779 struct nlmsghdr
*n
, u32 clid
,
780 struct Qdisc
*old
, struct Qdisc
*new)
783 qdisc_notify(net
, skb
, n
, clid
, old
, new);
789 /* Graft qdisc "new" to class "classid" of qdisc "parent" or
792 * When appropriate send a netlink notification using 'skb'
795 * On success, destroy old qdisc.
798 static int qdisc_graft(struct net_device
*dev
, struct Qdisc
*parent
,
799 struct sk_buff
*skb
, struct nlmsghdr
*n
, u32 classid
,
800 struct Qdisc
*new, struct Qdisc
*old
)
802 struct Qdisc
*q
= old
;
803 struct net
*net
= dev_net(dev
);
806 if (parent
== NULL
) {
807 unsigned int i
, num_q
, ingress
;
810 num_q
= dev
->num_tx_queues
;
811 if ((q
&& q
->flags
& TCQ_F_INGRESS
) ||
812 (new && new->flags
& TCQ_F_INGRESS
)) {
815 if (!dev_ingress_queue(dev
))
819 if (dev
->flags
& IFF_UP
)
822 if (new && new->ops
->attach
)
825 for (i
= 0; i
< num_q
; i
++) {
826 struct netdev_queue
*dev_queue
= dev_ingress_queue(dev
);
829 dev_queue
= netdev_get_tx_queue(dev
, i
);
831 old
= dev_graft_qdisc(dev_queue
, new);
833 atomic_inc(&new->refcnt
);
841 notify_and_destroy(net
, skb
, n
, classid
,
843 if (new && !new->ops
->attach
)
844 atomic_inc(&new->refcnt
);
845 dev
->qdisc
= new ? : &noop_qdisc
;
847 if (new && new->ops
->attach
)
848 new->ops
->attach(new);
850 notify_and_destroy(net
, skb
, n
, classid
, old
, new);
853 if (dev
->flags
& IFF_UP
)
856 const struct Qdisc_class_ops
*cops
= parent
->ops
->cl_ops
;
859 if (cops
&& cops
->graft
) {
860 unsigned long cl
= cops
->get(parent
, classid
);
862 err
= cops
->graft(parent
, cl
, new, &old
);
863 cops
->put(parent
, cl
);
868 notify_and_destroy(net
, skb
, n
, classid
, old
, new);
873 /* lockdep annotation is needed for ingress; egress gets it only for name */
874 static struct lock_class_key qdisc_tx_lock
;
875 static struct lock_class_key qdisc_rx_lock
;
878 Allocate and initialize new qdisc.
880 Parameters are passed via opt.
883 static struct Qdisc
*qdisc_create(struct net_device
*dev
,
884 struct netdev_queue
*dev_queue
,
885 struct Qdisc
*p
, u32 parent
, u32 handle
,
886 struct nlattr
**tca
, int *errp
)
889 struct nlattr
*kind
= tca
[TCA_KIND
];
891 struct Qdisc_ops
*ops
;
892 struct qdisc_size_table
*stab
;
894 ops
= qdisc_lookup_ops(kind
);
895 #ifdef CONFIG_MODULES
896 if (ops
== NULL
&& kind
!= NULL
) {
898 if (nla_strlcpy(name
, kind
, IFNAMSIZ
) < IFNAMSIZ
) {
899 /* We dropped the RTNL semaphore in order to
900 * perform the module load. So, even if we
901 * succeeded in loading the module we have to
902 * tell the caller to replay the request. We
903 * indicate this using -EAGAIN.
904 * We replay the request because the device may
905 * go away in the mean time.
908 request_module("sch_%s", name
);
910 ops
= qdisc_lookup_ops(kind
);
912 /* We will try again qdisc_lookup_ops,
913 * so don't keep a reference.
915 module_put(ops
->owner
);
927 sch
= qdisc_alloc(dev_queue
, ops
);
933 sch
->parent
= parent
;
935 if (handle
== TC_H_INGRESS
) {
936 sch
->flags
|= TCQ_F_INGRESS
;
937 handle
= TC_H_MAKE(TC_H_INGRESS
, 0);
938 lockdep_set_class(qdisc_lock(sch
), &qdisc_rx_lock
);
941 handle
= qdisc_alloc_handle(dev
);
946 lockdep_set_class(qdisc_lock(sch
), &qdisc_tx_lock
);
947 if (!netif_is_multiqueue(dev
))
948 sch
->flags
|= TCQ_F_ONETXQUEUE
;
951 sch
->handle
= handle
;
953 /* This exist to keep backward compatible with a userspace
954 * loophole, what allowed userspace to get IFF_NO_QUEUE
955 * facility on older kernels by setting tx_queue_len=0 (prior
956 * to qdisc init), and then forgot to reinit tx_queue_len
957 * before again attaching a qdisc.
959 if ((dev
->priv_flags
& IFF_NO_QUEUE
) && (dev
->tx_queue_len
== 0)) {
960 dev
->tx_queue_len
= DEFAULT_TX_QUEUE_LEN
;
961 netdev_info(dev
, "Caught tx_queue_len zero misconfig\n");
964 if (!ops
->init
|| (err
= ops
->init(sch
, tca
[TCA_OPTIONS
])) == 0) {
965 if (qdisc_is_percpu_stats(sch
)) {
967 netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu
);
968 if (!sch
->cpu_bstats
)
971 sch
->cpu_qstats
= alloc_percpu(struct gnet_stats_queue
);
972 if (!sch
->cpu_qstats
)
977 stab
= qdisc_get_stab(tca
[TCA_STAB
]);
982 rcu_assign_pointer(sch
->stab
, stab
);
988 if (sch
->flags
& TCQ_F_MQROOT
)
991 if ((sch
->parent
!= TC_H_ROOT
) &&
992 !(sch
->flags
& TCQ_F_INGRESS
) &&
993 (!p
|| !(p
->flags
& TCQ_F_MQROOT
)))
994 running
= qdisc_root_sleeping_running(sch
);
996 running
= &sch
->running
;
998 err
= gen_new_estimator(&sch
->bstats
,
1008 qdisc_hash_add(sch
, false);
1012 /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */
1016 kfree((char *) sch
- sch
->padded
);
1018 module_put(ops
->owner
);
1024 free_percpu(sch
->cpu_bstats
);
1025 free_percpu(sch
->cpu_qstats
);
1027 * Any broken qdiscs that would require a ops->reset() here?
1028 * The qdisc was never in action so it shouldn't be necessary.
1030 qdisc_put_stab(rtnl_dereference(sch
->stab
));
1036 static int qdisc_change(struct Qdisc
*sch
, struct nlattr
**tca
)
1038 struct qdisc_size_table
*ostab
, *stab
= NULL
;
1041 if (tca
[TCA_OPTIONS
]) {
1042 if (sch
->ops
->change
== NULL
)
1044 err
= sch
->ops
->change(sch
, tca
[TCA_OPTIONS
]);
1049 if (tca
[TCA_STAB
]) {
1050 stab
= qdisc_get_stab(tca
[TCA_STAB
]);
1052 return PTR_ERR(stab
);
1055 ostab
= rtnl_dereference(sch
->stab
);
1056 rcu_assign_pointer(sch
->stab
, stab
);
1057 qdisc_put_stab(ostab
);
1059 if (tca
[TCA_RATE
]) {
1060 /* NB: ignores errors from replace_estimator
1061 because change can't be undone. */
1062 if (sch
->flags
& TCQ_F_MQROOT
)
1064 gen_replace_estimator(&sch
->bstats
,
1068 qdisc_root_sleeping_running(sch
),
1075 struct check_loop_arg
{
1076 struct qdisc_walker w
;
1081 static int check_loop_fn(struct Qdisc
*q
, unsigned long cl
,
1082 struct qdisc_walker
*w
);
1084 static int check_loop(struct Qdisc
*q
, struct Qdisc
*p
, int depth
)
1086 struct check_loop_arg arg
;
1088 if (q
->ops
->cl_ops
== NULL
)
1091 arg
.w
.stop
= arg
.w
.skip
= arg
.w
.count
= 0;
1092 arg
.w
.fn
= check_loop_fn
;
1095 q
->ops
->cl_ops
->walk(q
, &arg
.w
);
1096 return arg
.w
.stop
? -ELOOP
: 0;
1100 check_loop_fn(struct Qdisc
*q
, unsigned long cl
, struct qdisc_walker
*w
)
1103 const struct Qdisc_class_ops
*cops
= q
->ops
->cl_ops
;
1104 struct check_loop_arg
*arg
= (struct check_loop_arg
*)w
;
1106 leaf
= cops
->leaf(q
, cl
);
1108 if (leaf
== arg
->p
|| arg
->depth
> 7)
1110 return check_loop(leaf
, arg
->p
, arg
->depth
+ 1);
1119 static int tc_get_qdisc(struct sk_buff
*skb
, struct nlmsghdr
*n
)
1121 struct net
*net
= sock_net(skb
->sk
);
1122 struct tcmsg
*tcm
= nlmsg_data(n
);
1123 struct nlattr
*tca
[TCA_MAX
+ 1];
1124 struct net_device
*dev
;
1126 struct Qdisc
*q
= NULL
;
1127 struct Qdisc
*p
= NULL
;
1130 if ((n
->nlmsg_type
!= RTM_GETQDISC
) &&
1131 !netlink_ns_capable(skb
, net
->user_ns
, CAP_NET_ADMIN
))
1134 err
= nlmsg_parse(n
, sizeof(*tcm
), tca
, TCA_MAX
, NULL
);
1138 dev
= __dev_get_by_index(net
, tcm
->tcm_ifindex
);
1142 clid
= tcm
->tcm_parent
;
1144 if (clid
!= TC_H_ROOT
) {
1145 if (TC_H_MAJ(clid
) != TC_H_MAJ(TC_H_INGRESS
)) {
1146 p
= qdisc_lookup(dev
, TC_H_MAJ(clid
));
1149 q
= qdisc_leaf(p
, clid
);
1150 } else if (dev_ingress_queue(dev
)) {
1151 q
= dev_ingress_queue(dev
)->qdisc_sleeping
;
1159 if (tcm
->tcm_handle
&& q
->handle
!= tcm
->tcm_handle
)
1162 q
= qdisc_lookup(dev
, tcm
->tcm_handle
);
1167 if (tca
[TCA_KIND
] && nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))
1170 if (n
->nlmsg_type
== RTM_DELQDISC
) {
1175 err
= qdisc_graft(dev
, p
, skb
, n
, clid
, NULL
, q
);
1179 qdisc_notify(net
, skb
, n
, clid
, NULL
, q
);
1185 * Create/change qdisc.
1188 static int tc_modify_qdisc(struct sk_buff
*skb
, struct nlmsghdr
*n
)
1190 struct net
*net
= sock_net(skb
->sk
);
1192 struct nlattr
*tca
[TCA_MAX
+ 1];
1193 struct net_device
*dev
;
1195 struct Qdisc
*q
, *p
;
1198 if (!netlink_ns_capable(skb
, net
->user_ns
, CAP_NET_ADMIN
))
1202 /* Reinit, just in case something touches this. */
1203 err
= nlmsg_parse(n
, sizeof(*tcm
), tca
, TCA_MAX
, NULL
);
1207 tcm
= nlmsg_data(n
);
1208 clid
= tcm
->tcm_parent
;
1211 dev
= __dev_get_by_index(net
, tcm
->tcm_ifindex
);
1217 if (clid
!= TC_H_ROOT
) {
1218 if (clid
!= TC_H_INGRESS
) {
1219 p
= qdisc_lookup(dev
, TC_H_MAJ(clid
));
1222 q
= qdisc_leaf(p
, clid
);
1223 } else if (dev_ingress_queue_create(dev
)) {
1224 q
= dev_ingress_queue(dev
)->qdisc_sleeping
;
1230 /* It may be default qdisc, ignore it */
1231 if (q
&& q
->handle
== 0)
1234 if (!q
|| !tcm
->tcm_handle
|| q
->handle
!= tcm
->tcm_handle
) {
1235 if (tcm
->tcm_handle
) {
1236 if (q
&& !(n
->nlmsg_flags
& NLM_F_REPLACE
))
1238 if (TC_H_MIN(tcm
->tcm_handle
))
1240 q
= qdisc_lookup(dev
, tcm
->tcm_handle
);
1242 goto create_n_graft
;
1243 if (n
->nlmsg_flags
& NLM_F_EXCL
)
1245 if (tca
[TCA_KIND
] && nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))
1248 (p
&& check_loop(q
, p
, 0)))
1250 atomic_inc(&q
->refcnt
);
1254 goto create_n_graft
;
1256 /* This magic test requires explanation.
1258 * We know, that some child q is already
1259 * attached to this parent and have choice:
1260 * either to change it or to create/graft new one.
1262 * 1. We are allowed to create/graft only
1263 * if CREATE and REPLACE flags are set.
1265 * 2. If EXCL is set, requestor wanted to say,
1266 * that qdisc tcm_handle is not expected
1267 * to exist, so that we choose create/graft too.
1269 * 3. The last case is when no flags are set.
1270 * Alas, it is sort of hole in API, we
1271 * cannot decide what to do unambiguously.
1272 * For now we select create/graft, if
1273 * user gave KIND, which does not match existing.
1275 if ((n
->nlmsg_flags
& NLM_F_CREATE
) &&
1276 (n
->nlmsg_flags
& NLM_F_REPLACE
) &&
1277 ((n
->nlmsg_flags
& NLM_F_EXCL
) ||
1279 nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))))
1280 goto create_n_graft
;
1284 if (!tcm
->tcm_handle
)
1286 q
= qdisc_lookup(dev
, tcm
->tcm_handle
);
1289 /* Change qdisc parameters */
1292 if (n
->nlmsg_flags
& NLM_F_EXCL
)
1294 if (tca
[TCA_KIND
] && nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))
1296 err
= qdisc_change(q
, tca
);
1298 qdisc_notify(net
, skb
, n
, clid
, NULL
, q
);
1302 if (!(n
->nlmsg_flags
& NLM_F_CREATE
))
1304 if (clid
== TC_H_INGRESS
) {
1305 if (dev_ingress_queue(dev
))
1306 q
= qdisc_create(dev
, dev_ingress_queue(dev
), p
,
1307 tcm
->tcm_parent
, tcm
->tcm_parent
,
1312 struct netdev_queue
*dev_queue
;
1314 if (p
&& p
->ops
->cl_ops
&& p
->ops
->cl_ops
->select_queue
)
1315 dev_queue
= p
->ops
->cl_ops
->select_queue(p
, tcm
);
1317 dev_queue
= p
->dev_queue
;
1319 dev_queue
= netdev_get_tx_queue(dev
, 0);
1321 q
= qdisc_create(dev
, dev_queue
, p
,
1322 tcm
->tcm_parent
, tcm
->tcm_handle
,
1332 err
= qdisc_graft(dev
, p
, skb
, n
, clid
, q
, NULL
);
1342 static int tc_fill_qdisc(struct sk_buff
*skb
, struct Qdisc
*q
, u32 clid
,
1343 u32 portid
, u32 seq
, u16 flags
, int event
)
1345 struct gnet_stats_basic_cpu __percpu
*cpu_bstats
= NULL
;
1346 struct gnet_stats_queue __percpu
*cpu_qstats
= NULL
;
1348 struct nlmsghdr
*nlh
;
1349 unsigned char *b
= skb_tail_pointer(skb
);
1351 struct qdisc_size_table
*stab
;
1355 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*tcm
), flags
);
1357 goto out_nlmsg_trim
;
1358 tcm
= nlmsg_data(nlh
);
1359 tcm
->tcm_family
= AF_UNSPEC
;
1362 tcm
->tcm_ifindex
= qdisc_dev(q
)->ifindex
;
1363 tcm
->tcm_parent
= clid
;
1364 tcm
->tcm_handle
= q
->handle
;
1365 tcm
->tcm_info
= atomic_read(&q
->refcnt
);
1366 if (nla_put_string(skb
, TCA_KIND
, q
->ops
->id
))
1367 goto nla_put_failure
;
1368 if (q
->ops
->dump
&& q
->ops
->dump(q
, skb
) < 0)
1369 goto nla_put_failure
;
1372 stab
= rtnl_dereference(q
->stab
);
1373 if (stab
&& qdisc_dump_stab(skb
, stab
) < 0)
1374 goto nla_put_failure
;
1376 if (gnet_stats_start_copy_compat(skb
, TCA_STATS2
, TCA_STATS
, TCA_XSTATS
,
1377 NULL
, &d
, TCA_PAD
) < 0)
1378 goto nla_put_failure
;
1380 if (q
->ops
->dump_stats
&& q
->ops
->dump_stats(q
, &d
) < 0)
1381 goto nla_put_failure
;
1383 if (qdisc_is_percpu_stats(q
)) {
1384 cpu_bstats
= q
->cpu_bstats
;
1385 cpu_qstats
= q
->cpu_qstats
;
1388 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q
),
1389 &d
, cpu_bstats
, &q
->bstats
) < 0 ||
1390 gnet_stats_copy_rate_est(&d
, &q
->rate_est
) < 0 ||
1391 gnet_stats_copy_queue(&d
, cpu_qstats
, &q
->qstats
, qlen
) < 0)
1392 goto nla_put_failure
;
1394 if (gnet_stats_finish_copy(&d
) < 0)
1395 goto nla_put_failure
;
1397 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
1406 static bool tc_qdisc_dump_ignore(struct Qdisc
*q
, bool dump_invisible
)
1408 if (q
->flags
& TCQ_F_BUILTIN
)
1410 if ((q
->flags
& TCQ_F_INVISIBLE
) && !dump_invisible
)
1416 static int qdisc_notify(struct net
*net
, struct sk_buff
*oskb
,
1417 struct nlmsghdr
*n
, u32 clid
,
1418 struct Qdisc
*old
, struct Qdisc
*new)
1420 struct sk_buff
*skb
;
1421 u32 portid
= oskb
? NETLINK_CB(oskb
).portid
: 0;
1423 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1427 if (old
&& !tc_qdisc_dump_ignore(old
, false)) {
1428 if (tc_fill_qdisc(skb
, old
, clid
, portid
, n
->nlmsg_seq
,
1429 0, RTM_DELQDISC
) < 0)
1432 if (new && !tc_qdisc_dump_ignore(new, false)) {
1433 if (tc_fill_qdisc(skb
, new, clid
, portid
, n
->nlmsg_seq
,
1434 old
? NLM_F_REPLACE
: 0, RTM_NEWQDISC
) < 0)
1439 return rtnetlink_send(skb
, net
, portid
, RTNLGRP_TC
,
1440 n
->nlmsg_flags
& NLM_F_ECHO
);
1447 static int tc_dump_qdisc_root(struct Qdisc
*root
, struct sk_buff
*skb
,
1448 struct netlink_callback
*cb
,
1449 int *q_idx_p
, int s_q_idx
, bool recur
,
1450 bool dump_invisible
)
1452 int ret
= 0, q_idx
= *q_idx_p
;
1460 if (q_idx
< s_q_idx
) {
1463 if (!tc_qdisc_dump_ignore(q
, dump_invisible
) &&
1464 tc_fill_qdisc(skb
, q
, q
->parent
, NETLINK_CB(cb
->skb
).portid
,
1465 cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
,
1471 /* If dumping singletons, there is no qdisc_dev(root) and the singleton
1472 * itself has already been dumped.
1474 * If we've already dumped the top-level (ingress) qdisc above and the global
1475 * qdisc hashtable, we don't want to hit it again
1477 if (!qdisc_dev(root
) || !recur
)
1480 hash_for_each(qdisc_dev(root
)->qdisc_hash
, b
, q
, hash
) {
1481 if (q_idx
< s_q_idx
) {
1485 if (!tc_qdisc_dump_ignore(q
, dump_invisible
) &&
1486 tc_fill_qdisc(skb
, q
, q
->parent
, NETLINK_CB(cb
->skb
).portid
,
1487 cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
,
1501 static int tc_dump_qdisc(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1503 struct net
*net
= sock_net(skb
->sk
);
1506 struct net_device
*dev
;
1507 const struct nlmsghdr
*nlh
= cb
->nlh
;
1508 struct tcmsg
*tcm
= nlmsg_data(nlh
);
1509 struct nlattr
*tca
[TCA_MAX
+ 1];
1512 s_idx
= cb
->args
[0];
1513 s_q_idx
= q_idx
= cb
->args
[1];
1518 err
= nlmsg_parse(nlh
, sizeof(*tcm
), tca
, TCA_MAX
, NULL
);
1522 for_each_netdev(net
, dev
) {
1523 struct netdev_queue
*dev_queue
;
1531 if (tc_dump_qdisc_root(dev
->qdisc
, skb
, cb
, &q_idx
, s_q_idx
,
1532 true, tca
[TCA_DUMP_INVISIBLE
]) < 0)
1535 dev_queue
= dev_ingress_queue(dev
);
1537 tc_dump_qdisc_root(dev_queue
->qdisc_sleeping
, skb
, cb
,
1538 &q_idx
, s_q_idx
, false,
1539 tca
[TCA_DUMP_INVISIBLE
]) < 0)
1548 cb
->args
[1] = q_idx
;
1555 /************************************************
1556 * Traffic classes manipulation. *
1557 ************************************************/
1561 static int tc_ctl_tclass(struct sk_buff
*skb
, struct nlmsghdr
*n
)
1563 struct net
*net
= sock_net(skb
->sk
);
1564 struct tcmsg
*tcm
= nlmsg_data(n
);
1565 struct nlattr
*tca
[TCA_MAX
+ 1];
1566 struct net_device
*dev
;
1567 struct Qdisc
*q
= NULL
;
1568 const struct Qdisc_class_ops
*cops
;
1569 unsigned long cl
= 0;
1570 unsigned long new_cl
;
1576 if ((n
->nlmsg_type
!= RTM_GETTCLASS
) &&
1577 !netlink_ns_capable(skb
, net
->user_ns
, CAP_NET_ADMIN
))
1580 err
= nlmsg_parse(n
, sizeof(*tcm
), tca
, TCA_MAX
, NULL
);
1584 dev
= __dev_get_by_index(net
, tcm
->tcm_ifindex
);
1589 parent == TC_H_UNSPEC - unspecified parent.
1590 parent == TC_H_ROOT - class is root, which has no parent.
1591 parent == X:0 - parent is root class.
1592 parent == X:Y - parent is a node in hierarchy.
1593 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1595 handle == 0:0 - generate handle from kernel pool.
1596 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1597 handle == X:Y - clear.
1598 handle == X:0 - root class.
1601 /* Step 1. Determine qdisc handle X:0 */
1603 portid
= tcm
->tcm_parent
;
1604 clid
= tcm
->tcm_handle
;
1605 qid
= TC_H_MAJ(clid
);
1607 if (portid
!= TC_H_ROOT
) {
1608 u32 qid1
= TC_H_MAJ(portid
);
1611 /* If both majors are known, they must be identical. */
1616 } else if (qid
== 0)
1617 qid
= dev
->qdisc
->handle
;
1619 /* Now qid is genuine qdisc handle consistent
1620 * both with parent and child.
1622 * TC_H_MAJ(portid) still may be unspecified, complete it now.
1625 portid
= TC_H_MAKE(qid
, portid
);
1628 qid
= dev
->qdisc
->handle
;
1631 /* OK. Locate qdisc */
1632 q
= qdisc_lookup(dev
, qid
);
1636 /* An check that it supports classes */
1637 cops
= q
->ops
->cl_ops
;
1641 /* Now try to get class */
1643 if (portid
== TC_H_ROOT
)
1646 clid
= TC_H_MAKE(qid
, clid
);
1649 cl
= cops
->get(q
, clid
);
1653 if (n
->nlmsg_type
!= RTM_NEWTCLASS
||
1654 !(n
->nlmsg_flags
& NLM_F_CREATE
))
1657 switch (n
->nlmsg_type
) {
1660 if (n
->nlmsg_flags
& NLM_F_EXCL
)
1666 err
= cops
->delete(q
, cl
);
1668 tclass_notify(net
, skb
, n
, q
, cl
,
1672 err
= tclass_notify(net
, skb
, n
, q
, cl
, RTM_NEWTCLASS
);
1683 err
= cops
->change(q
, clid
, portid
, tca
, &new_cl
);
1685 tclass_notify(net
, skb
, n
, q
, new_cl
, RTM_NEWTCLASS
);
1695 static int tc_fill_tclass(struct sk_buff
*skb
, struct Qdisc
*q
,
1697 u32 portid
, u32 seq
, u16 flags
, int event
)
1700 struct nlmsghdr
*nlh
;
1701 unsigned char *b
= skb_tail_pointer(skb
);
1703 const struct Qdisc_class_ops
*cl_ops
= q
->ops
->cl_ops
;
1706 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*tcm
), flags
);
1708 goto out_nlmsg_trim
;
1709 tcm
= nlmsg_data(nlh
);
1710 tcm
->tcm_family
= AF_UNSPEC
;
1713 tcm
->tcm_ifindex
= qdisc_dev(q
)->ifindex
;
1714 tcm
->tcm_parent
= q
->handle
;
1715 tcm
->tcm_handle
= q
->handle
;
1717 if (nla_put_string(skb
, TCA_KIND
, q
->ops
->id
))
1718 goto nla_put_failure
;
1719 if (cl_ops
->dump
&& cl_ops
->dump(q
, cl
, skb
, tcm
) < 0)
1720 goto nla_put_failure
;
1722 if (gnet_stats_start_copy_compat(skb
, TCA_STATS2
, TCA_STATS
, TCA_XSTATS
,
1723 NULL
, &d
, TCA_PAD
) < 0)
1724 goto nla_put_failure
;
1726 if (cl_ops
->dump_stats
&& cl_ops
->dump_stats(q
, cl
, &d
) < 0)
1727 goto nla_put_failure
;
1729 if (gnet_stats_finish_copy(&d
) < 0)
1730 goto nla_put_failure
;
1732 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
1741 static int tclass_notify(struct net
*net
, struct sk_buff
*oskb
,
1742 struct nlmsghdr
*n
, struct Qdisc
*q
,
1743 unsigned long cl
, int event
)
1745 struct sk_buff
*skb
;
1746 u32 portid
= oskb
? NETLINK_CB(oskb
).portid
: 0;
1748 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1752 if (tc_fill_tclass(skb
, q
, cl
, portid
, n
->nlmsg_seq
, 0, event
) < 0) {
1757 return rtnetlink_send(skb
, net
, portid
, RTNLGRP_TC
,
1758 n
->nlmsg_flags
& NLM_F_ECHO
);
1761 struct qdisc_dump_args
{
1762 struct qdisc_walker w
;
1763 struct sk_buff
*skb
;
1764 struct netlink_callback
*cb
;
1767 static int qdisc_class_dump(struct Qdisc
*q
, unsigned long cl
,
1768 struct qdisc_walker
*arg
)
1770 struct qdisc_dump_args
*a
= (struct qdisc_dump_args
*)arg
;
1772 return tc_fill_tclass(a
->skb
, q
, cl
, NETLINK_CB(a
->cb
->skb
).portid
,
1773 a
->cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
,
1777 static int tc_dump_tclass_qdisc(struct Qdisc
*q
, struct sk_buff
*skb
,
1778 struct tcmsg
*tcm
, struct netlink_callback
*cb
,
1781 struct qdisc_dump_args arg
;
1783 if (tc_qdisc_dump_ignore(q
, false) ||
1784 *t_p
< s_t
|| !q
->ops
->cl_ops
||
1786 TC_H_MAJ(tcm
->tcm_parent
) != q
->handle
)) {
1791 memset(&cb
->args
[1], 0, sizeof(cb
->args
)-sizeof(cb
->args
[0]));
1792 arg
.w
.fn
= qdisc_class_dump
;
1796 arg
.w
.skip
= cb
->args
[1];
1798 q
->ops
->cl_ops
->walk(q
, &arg
.w
);
1799 cb
->args
[1] = arg
.w
.count
;
1806 static int tc_dump_tclass_root(struct Qdisc
*root
, struct sk_buff
*skb
,
1807 struct tcmsg
*tcm
, struct netlink_callback
*cb
,
1816 if (tc_dump_tclass_qdisc(root
, skb
, tcm
, cb
, t_p
, s_t
) < 0)
1819 if (!qdisc_dev(root
))
1822 hash_for_each(qdisc_dev(root
)->qdisc_hash
, b
, q
, hash
) {
1823 if (tc_dump_tclass_qdisc(q
, skb
, tcm
, cb
, t_p
, s_t
) < 0)
1830 static int tc_dump_tclass(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1832 struct tcmsg
*tcm
= nlmsg_data(cb
->nlh
);
1833 struct net
*net
= sock_net(skb
->sk
);
1834 struct netdev_queue
*dev_queue
;
1835 struct net_device
*dev
;
1838 if (nlmsg_len(cb
->nlh
) < sizeof(*tcm
))
1840 dev
= dev_get_by_index(net
, tcm
->tcm_ifindex
);
1847 if (tc_dump_tclass_root(dev
->qdisc
, skb
, tcm
, cb
, &t
, s_t
) < 0)
1850 dev_queue
= dev_ingress_queue(dev
);
1852 tc_dump_tclass_root(dev_queue
->qdisc_sleeping
, skb
, tcm
, cb
,
1863 /* Main classifier routine: scans classifier chain attached
1864 * to this qdisc, (optionally) tests for protocol and asks
1865 * specific classifiers.
1867 int tc_classify(struct sk_buff
*skb
, const struct tcf_proto
*tp
,
1868 struct tcf_result
*res
, bool compat_mode
)
1870 __be16 protocol
= tc_skb_protocol(skb
);
1871 #ifdef CONFIG_NET_CLS_ACT
1872 const int max_reclassify_loop
= 4;
1873 const struct tcf_proto
*old_tp
= tp
;
1878 for (; tp
; tp
= rcu_dereference_bh(tp
->next
)) {
1881 if (tp
->protocol
!= protocol
&&
1882 tp
->protocol
!= htons(ETH_P_ALL
))
1885 err
= tp
->classify(skb
, tp
, res
);
1886 #ifdef CONFIG_NET_CLS_ACT
1887 if (unlikely(err
== TC_ACT_RECLASSIFY
&& !compat_mode
))
1894 return TC_ACT_UNSPEC
; /* signal: continue lookup */
1895 #ifdef CONFIG_NET_CLS_ACT
1897 if (unlikely(limit
++ >= max_reclassify_loop
)) {
1898 net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n",
1899 tp
->q
->ops
->id
, tp
->prio
& 0xffff,
1900 ntohs(tp
->protocol
));
1905 protocol
= tc_skb_protocol(skb
);
1909 EXPORT_SYMBOL(tc_classify
);
1911 #ifdef CONFIG_PROC_FS
1912 static int psched_show(struct seq_file
*seq
, void *v
)
1914 seq_printf(seq
, "%08x %08x %08x %08x\n",
1915 (u32
)NSEC_PER_USEC
, (u32
)PSCHED_TICKS2NS(1),
1917 (u32
)NSEC_PER_SEC
/ hrtimer_resolution
);
1922 static int psched_open(struct inode
*inode
, struct file
*file
)
1924 return single_open(file
, psched_show
, NULL
);
1927 static const struct file_operations psched_fops
= {
1928 .owner
= THIS_MODULE
,
1929 .open
= psched_open
,
1931 .llseek
= seq_lseek
,
1932 .release
= single_release
,
1935 static int __net_init
psched_net_init(struct net
*net
)
1937 struct proc_dir_entry
*e
;
1939 e
= proc_create("psched", 0, net
->proc_net
, &psched_fops
);
1946 static void __net_exit
psched_net_exit(struct net
*net
)
1948 remove_proc_entry("psched", net
->proc_net
);
1951 static int __net_init
psched_net_init(struct net
*net
)
1956 static void __net_exit
psched_net_exit(struct net
*net
)
1961 static struct pernet_operations psched_net_ops
= {
1962 .init
= psched_net_init
,
1963 .exit
= psched_net_exit
,
1966 static int __init
pktsched_init(void)
1970 err
= register_pernet_subsys(&psched_net_ops
);
1972 pr_err("pktsched_init: "
1973 "cannot initialize per netns operations\n");
1977 register_qdisc(&pfifo_fast_ops
);
1978 register_qdisc(&pfifo_qdisc_ops
);
1979 register_qdisc(&bfifo_qdisc_ops
);
1980 register_qdisc(&pfifo_head_drop_qdisc_ops
);
1981 register_qdisc(&mq_qdisc_ops
);
1982 register_qdisc(&noqueue_qdisc_ops
);
1984 rtnl_register(PF_UNSPEC
, RTM_NEWQDISC
, tc_modify_qdisc
, NULL
, NULL
);
1985 rtnl_register(PF_UNSPEC
, RTM_DELQDISC
, tc_get_qdisc
, NULL
, NULL
);
1986 rtnl_register(PF_UNSPEC
, RTM_GETQDISC
, tc_get_qdisc
, tc_dump_qdisc
,
1988 rtnl_register(PF_UNSPEC
, RTM_NEWTCLASS
, tc_ctl_tclass
, NULL
, NULL
);
1989 rtnl_register(PF_UNSPEC
, RTM_DELTCLASS
, tc_ctl_tclass
, NULL
, NULL
);
1990 rtnl_register(PF_UNSPEC
, RTM_GETTCLASS
, tc_ctl_tclass
, tc_dump_tclass
,
1996 subsys_initcall(pktsched_init
);