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>
38 #include <net/pkt_cls.h>
45 This file consists of two interrelated parts:
47 1. queueing disciplines manager frontend.
48 2. traffic classes manager frontend.
50 Generally, queueing discipline ("qdisc") is a black box,
51 which is able to enqueue packets and to dequeue them (when
52 device is ready to send something) in order and at times
53 determined by algorithm hidden in it.
55 qdisc's are divided to two categories:
56 - "queues", which have no internal structure visible from outside.
57 - "schedulers", which split all the packets to "traffic classes",
58 using "packet classifiers" (look at cls_api.c)
60 In turn, classes may have child qdiscs (as rule, queues)
61 attached to them etc. etc. etc.
63 The goal of the routines in this file is to translate
64 information supplied by user in the form of handles
65 to more intelligible for kernel form, to make some sanity
66 checks and part of work, which is common to all qdiscs
67 and to provide rtnetlink notifications.
69 All real intelligent work is done inside qdisc modules.
73 Every discipline has two major routines: enqueue and dequeue.
77 dequeue usually returns a skb to send. It is allowed to return NULL,
78 but it does not mean that queue is empty, it just means that
79 discipline does not want to send anything this time.
80 Queue is really empty if q->q.qlen == 0.
81 For complicated disciplines with multiple queues q->q is not
82 real packet queue, but however q->q.qlen must be valid.
86 enqueue returns 0, if packet was enqueued successfully.
87 If packet (this one or another one) was dropped, it returns
89 NET_XMIT_DROP - this packet dropped
90 Expected action: do not backoff, but wait until queue will clear.
91 NET_XMIT_CN - probably this packet enqueued, but another one dropped.
92 Expected action: backoff or ignore
98 like dequeue but without removing a packet from the queue
102 returns qdisc to initial state: purge all buffers, clear all
103 timers, counters (except for statistics) etc.
107 initializes newly created qdisc.
111 destroys resources allocated by init and during lifetime of qdisc.
115 changes qdisc parameters.
118 /* Protects list of registered TC modules. It is pure SMP lock. */
119 static DEFINE_RWLOCK(qdisc_mod_lock
);
122 /************************************************
123 * Queueing disciplines manipulation. *
124 ************************************************/
127 /* The list of all installed queueing disciplines. */
129 static struct Qdisc_ops
*qdisc_base
;
131 /* Register/unregister queueing discipline */
133 int register_qdisc(struct Qdisc_ops
*qops
)
135 struct Qdisc_ops
*q
, **qp
;
138 write_lock(&qdisc_mod_lock
);
139 for (qp
= &qdisc_base
; (q
= *qp
) != NULL
; qp
= &q
->next
)
140 if (!strcmp(qops
->id
, q
->id
))
143 if (qops
->enqueue
== NULL
)
144 qops
->enqueue
= noop_qdisc_ops
.enqueue
;
145 if (qops
->peek
== NULL
) {
146 if (qops
->dequeue
== NULL
)
147 qops
->peek
= noop_qdisc_ops
.peek
;
151 if (qops
->dequeue
== NULL
)
152 qops
->dequeue
= noop_qdisc_ops
.dequeue
;
155 const struct Qdisc_class_ops
*cops
= qops
->cl_ops
;
157 if (!(cops
->find
&& cops
->walk
&& cops
->leaf
))
160 if (cops
->tcf_block
&& !(cops
->bind_tcf
&& cops
->unbind_tcf
))
168 write_unlock(&qdisc_mod_lock
);
175 EXPORT_SYMBOL(register_qdisc
);
177 int unregister_qdisc(struct Qdisc_ops
*qops
)
179 struct Qdisc_ops
*q
, **qp
;
182 write_lock(&qdisc_mod_lock
);
183 for (qp
= &qdisc_base
; (q
= *qp
) != NULL
; qp
= &q
->next
)
191 write_unlock(&qdisc_mod_lock
);
194 EXPORT_SYMBOL(unregister_qdisc
);
196 /* Get default qdisc if not otherwise specified */
197 void qdisc_get_default(char *name
, size_t len
)
199 read_lock(&qdisc_mod_lock
);
200 strlcpy(name
, default_qdisc_ops
->id
, len
);
201 read_unlock(&qdisc_mod_lock
);
204 static struct Qdisc_ops
*qdisc_lookup_default(const char *name
)
206 struct Qdisc_ops
*q
= NULL
;
208 for (q
= qdisc_base
; q
; q
= q
->next
) {
209 if (!strcmp(name
, q
->id
)) {
210 if (!try_module_get(q
->owner
))
219 /* Set new default qdisc to use */
220 int qdisc_set_default(const char *name
)
222 const struct Qdisc_ops
*ops
;
224 if (!capable(CAP_NET_ADMIN
))
227 write_lock(&qdisc_mod_lock
);
228 ops
= qdisc_lookup_default(name
);
230 /* Not found, drop lock and try to load module */
231 write_unlock(&qdisc_mod_lock
);
232 request_module("sch_%s", name
);
233 write_lock(&qdisc_mod_lock
);
235 ops
= qdisc_lookup_default(name
);
239 /* Set new default */
240 module_put(default_qdisc_ops
->owner
);
241 default_qdisc_ops
= ops
;
243 write_unlock(&qdisc_mod_lock
);
245 return ops
? 0 : -ENOENT
;
248 #ifdef CONFIG_NET_SCH_DEFAULT
249 /* Set default value from kernel config */
250 static int __init
sch_default_qdisc(void)
252 return qdisc_set_default(CONFIG_DEFAULT_NET_SCH
);
254 late_initcall(sch_default_qdisc
);
257 /* We know handle. Find qdisc among all qdisc's attached to device
258 * (root qdisc, all its children, children of children etc.)
259 * Note: caller either uses rtnl or rcu_read_lock()
262 static struct Qdisc
*qdisc_match_from_root(struct Qdisc
*root
, u32 handle
)
266 if (!qdisc_dev(root
))
267 return (root
->handle
== handle
? root
: NULL
);
269 if (!(root
->flags
& TCQ_F_BUILTIN
) &&
270 root
->handle
== handle
)
273 hash_for_each_possible_rcu(qdisc_dev(root
)->qdisc_hash
, q
, hash
, handle
) {
274 if (q
->handle
== handle
)
280 void qdisc_hash_add(struct Qdisc
*q
, bool invisible
)
282 if ((q
->parent
!= TC_H_ROOT
) && !(q
->flags
& TCQ_F_INGRESS
)) {
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
)
306 q
= qdisc_match_from_root(dev
->qdisc
, handle
);
310 if (dev_ingress_queue(dev
))
311 q
= qdisc_match_from_root(
312 dev_ingress_queue(dev
)->qdisc_sleeping
,
318 static struct Qdisc
*qdisc_leaf(struct Qdisc
*p
, u32 classid
)
322 const struct Qdisc_class_ops
*cops
= p
->ops
->cl_ops
;
326 cl
= cops
->find(p
, classid
);
330 leaf
= cops
->leaf(p
, cl
);
334 /* Find queueing discipline by name */
336 static struct Qdisc_ops
*qdisc_lookup_ops(struct nlattr
*kind
)
338 struct Qdisc_ops
*q
= NULL
;
341 read_lock(&qdisc_mod_lock
);
342 for (q
= qdisc_base
; q
; q
= q
->next
) {
343 if (nla_strcmp(kind
, q
->id
) == 0) {
344 if (!try_module_get(q
->owner
))
349 read_unlock(&qdisc_mod_lock
);
354 /* The linklayer setting were not transferred from iproute2, in older
355 * versions, and the rate tables lookup systems have been dropped in
356 * the kernel. To keep backward compatible with older iproute2 tc
357 * utils, we detect the linklayer setting by detecting if the rate
358 * table were modified.
360 * For linklayer ATM table entries, the rate table will be aligned to
361 * 48 bytes, thus some table entries will contain the same value. The
362 * mpu (min packet unit) is also encoded into the old rate table, thus
363 * starting from the mpu, we find low and high table entries for
364 * mapping this cell. If these entries contain the same value, when
365 * the rate tables have been modified for linklayer ATM.
367 * This is done by rounding mpu to the nearest 48 bytes cell/entry,
368 * and then roundup to the next cell, calc the table entry one below,
371 static __u8
__detect_linklayer(struct tc_ratespec
*r
, __u32
*rtab
)
373 int low
= roundup(r
->mpu
, 48);
374 int high
= roundup(low
+1, 48);
375 int cell_low
= low
>> r
->cell_log
;
376 int cell_high
= (high
>> r
->cell_log
) - 1;
378 /* rtab is too inaccurate at rates > 100Mbit/s */
379 if ((r
->rate
> (100000000/8)) || (rtab
[0] == 0)) {
380 pr_debug("TC linklayer: Giving up ATM detection\n");
381 return TC_LINKLAYER_ETHERNET
;
384 if ((cell_high
> cell_low
) && (cell_high
< 256)
385 && (rtab
[cell_low
] == rtab
[cell_high
])) {
386 pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n",
387 cell_low
, cell_high
, rtab
[cell_high
]);
388 return TC_LINKLAYER_ATM
;
390 return TC_LINKLAYER_ETHERNET
;
393 static struct qdisc_rate_table
*qdisc_rtab_list
;
395 struct qdisc_rate_table
*qdisc_get_rtab(struct tc_ratespec
*r
,
398 struct qdisc_rate_table
*rtab
;
400 if (tab
== NULL
|| r
->rate
== 0 || r
->cell_log
== 0 ||
401 nla_len(tab
) != TC_RTAB_SIZE
)
404 for (rtab
= qdisc_rtab_list
; rtab
; rtab
= rtab
->next
) {
405 if (!memcmp(&rtab
->rate
, r
, sizeof(struct tc_ratespec
)) &&
406 !memcmp(&rtab
->data
, nla_data(tab
), 1024)) {
412 rtab
= kmalloc(sizeof(*rtab
), GFP_KERNEL
);
416 memcpy(rtab
->data
, nla_data(tab
), 1024);
417 if (r
->linklayer
== TC_LINKLAYER_UNAWARE
)
418 r
->linklayer
= __detect_linklayer(r
, rtab
->data
);
419 rtab
->next
= qdisc_rtab_list
;
420 qdisc_rtab_list
= rtab
;
424 EXPORT_SYMBOL(qdisc_get_rtab
);
426 void qdisc_put_rtab(struct qdisc_rate_table
*tab
)
428 struct qdisc_rate_table
*rtab
, **rtabp
;
430 if (!tab
|| --tab
->refcnt
)
433 for (rtabp
= &qdisc_rtab_list
;
434 (rtab
= *rtabp
) != NULL
;
435 rtabp
= &rtab
->next
) {
443 EXPORT_SYMBOL(qdisc_put_rtab
);
445 static LIST_HEAD(qdisc_stab_list
);
447 static const struct nla_policy stab_policy
[TCA_STAB_MAX
+ 1] = {
448 [TCA_STAB_BASE
] = { .len
= sizeof(struct tc_sizespec
) },
449 [TCA_STAB_DATA
] = { .type
= NLA_BINARY
},
452 static struct qdisc_size_table
*qdisc_get_stab(struct nlattr
*opt
)
454 struct nlattr
*tb
[TCA_STAB_MAX
+ 1];
455 struct qdisc_size_table
*stab
;
456 struct tc_sizespec
*s
;
457 unsigned int tsize
= 0;
461 err
= nla_parse_nested(tb
, TCA_STAB_MAX
, opt
, stab_policy
, NULL
);
464 if (!tb
[TCA_STAB_BASE
])
465 return ERR_PTR(-EINVAL
);
467 s
= nla_data(tb
[TCA_STAB_BASE
]);
470 if (!tb
[TCA_STAB_DATA
])
471 return ERR_PTR(-EINVAL
);
472 tab
= nla_data(tb
[TCA_STAB_DATA
]);
473 tsize
= nla_len(tb
[TCA_STAB_DATA
]) / sizeof(u16
);
476 if (tsize
!= s
->tsize
|| (!tab
&& tsize
> 0))
477 return ERR_PTR(-EINVAL
);
479 list_for_each_entry(stab
, &qdisc_stab_list
, list
) {
480 if (memcmp(&stab
->szopts
, s
, sizeof(*s
)))
482 if (tsize
> 0 && memcmp(stab
->data
, tab
, tsize
* sizeof(u16
)))
488 stab
= kmalloc(sizeof(*stab
) + tsize
* sizeof(u16
), GFP_KERNEL
);
490 return ERR_PTR(-ENOMEM
);
495 memcpy(stab
->data
, tab
, tsize
* sizeof(u16
));
497 list_add_tail(&stab
->list
, &qdisc_stab_list
);
502 static void stab_kfree_rcu(struct rcu_head
*head
)
504 kfree(container_of(head
, struct qdisc_size_table
, rcu
));
507 void qdisc_put_stab(struct qdisc_size_table
*tab
)
512 if (--tab
->refcnt
== 0) {
513 list_del(&tab
->list
);
514 call_rcu_bh(&tab
->rcu
, stab_kfree_rcu
);
517 EXPORT_SYMBOL(qdisc_put_stab
);
519 static int qdisc_dump_stab(struct sk_buff
*skb
, struct qdisc_size_table
*stab
)
523 nest
= nla_nest_start(skb
, TCA_STAB
);
525 goto nla_put_failure
;
526 if (nla_put(skb
, TCA_STAB_BASE
, sizeof(stab
->szopts
), &stab
->szopts
))
527 goto nla_put_failure
;
528 nla_nest_end(skb
, nest
);
536 void __qdisc_calculate_pkt_len(struct sk_buff
*skb
,
537 const struct qdisc_size_table
*stab
)
541 pkt_len
= skb
->len
+ stab
->szopts
.overhead
;
542 if (unlikely(!stab
->szopts
.tsize
))
545 slot
= pkt_len
+ stab
->szopts
.cell_align
;
546 if (unlikely(slot
< 0))
549 slot
>>= stab
->szopts
.cell_log
;
550 if (likely(slot
< stab
->szopts
.tsize
))
551 pkt_len
= stab
->data
[slot
];
553 pkt_len
= stab
->data
[stab
->szopts
.tsize
- 1] *
554 (slot
/ stab
->szopts
.tsize
) +
555 stab
->data
[slot
% stab
->szopts
.tsize
];
557 pkt_len
<<= stab
->szopts
.size_log
;
559 if (unlikely(pkt_len
< 1))
561 qdisc_skb_cb(skb
)->pkt_len
= pkt_len
;
563 EXPORT_SYMBOL(__qdisc_calculate_pkt_len
);
565 void qdisc_warn_nonwc(const char *txt
, struct Qdisc
*qdisc
)
567 if (!(qdisc
->flags
& TCQ_F_WARN_NONWC
)) {
568 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
569 txt
, qdisc
->ops
->id
, qdisc
->handle
>> 16);
570 qdisc
->flags
|= TCQ_F_WARN_NONWC
;
573 EXPORT_SYMBOL(qdisc_warn_nonwc
);
575 static enum hrtimer_restart
qdisc_watchdog(struct hrtimer
*timer
)
577 struct qdisc_watchdog
*wd
= container_of(timer
, struct qdisc_watchdog
,
581 __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_PINNED
);
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 if (wd
->last_expires
== expires
)
604 wd
->last_expires
= expires
;
605 hrtimer_start(&wd
->timer
,
606 ns_to_ktime(expires
),
607 HRTIMER_MODE_ABS_PINNED
);
609 EXPORT_SYMBOL(qdisc_watchdog_schedule_ns
);
611 void qdisc_watchdog_cancel(struct qdisc_watchdog
*wd
)
613 hrtimer_cancel(&wd
->timer
);
615 EXPORT_SYMBOL(qdisc_watchdog_cancel
);
617 static struct hlist_head
*qdisc_class_hash_alloc(unsigned int n
)
619 struct hlist_head
*h
;
622 h
= kvmalloc_array(n
, sizeof(struct hlist_head
), GFP_KERNEL
);
625 for (i
= 0; i
< n
; i
++)
626 INIT_HLIST_HEAD(&h
[i
]);
631 void qdisc_class_hash_grow(struct Qdisc
*sch
, struct Qdisc_class_hash
*clhash
)
633 struct Qdisc_class_common
*cl
;
634 struct hlist_node
*next
;
635 struct hlist_head
*nhash
, *ohash
;
636 unsigned int nsize
, nmask
, osize
;
639 /* Rehash when load factor exceeds 0.75 */
640 if (clhash
->hashelems
* 4 <= clhash
->hashsize
* 3)
642 nsize
= clhash
->hashsize
* 2;
644 nhash
= qdisc_class_hash_alloc(nsize
);
648 ohash
= clhash
->hash
;
649 osize
= clhash
->hashsize
;
652 for (i
= 0; i
< osize
; i
++) {
653 hlist_for_each_entry_safe(cl
, next
, &ohash
[i
], hnode
) {
654 h
= qdisc_class_hash(cl
->classid
, nmask
);
655 hlist_add_head(&cl
->hnode
, &nhash
[h
]);
658 clhash
->hash
= nhash
;
659 clhash
->hashsize
= nsize
;
660 clhash
->hashmask
= nmask
;
661 sch_tree_unlock(sch
);
665 EXPORT_SYMBOL(qdisc_class_hash_grow
);
667 int qdisc_class_hash_init(struct Qdisc_class_hash
*clhash
)
669 unsigned int size
= 4;
671 clhash
->hash
= qdisc_class_hash_alloc(size
);
672 if (clhash
->hash
== NULL
)
674 clhash
->hashsize
= size
;
675 clhash
->hashmask
= size
- 1;
676 clhash
->hashelems
= 0;
679 EXPORT_SYMBOL(qdisc_class_hash_init
);
681 void qdisc_class_hash_destroy(struct Qdisc_class_hash
*clhash
)
683 kvfree(clhash
->hash
);
685 EXPORT_SYMBOL(qdisc_class_hash_destroy
);
687 void qdisc_class_hash_insert(struct Qdisc_class_hash
*clhash
,
688 struct Qdisc_class_common
*cl
)
692 INIT_HLIST_NODE(&cl
->hnode
);
693 h
= qdisc_class_hash(cl
->classid
, clhash
->hashmask
);
694 hlist_add_head(&cl
->hnode
, &clhash
->hash
[h
]);
697 EXPORT_SYMBOL(qdisc_class_hash_insert
);
699 void qdisc_class_hash_remove(struct Qdisc_class_hash
*clhash
,
700 struct Qdisc_class_common
*cl
)
702 hlist_del(&cl
->hnode
);
705 EXPORT_SYMBOL(qdisc_class_hash_remove
);
707 /* Allocate an unique handle from space managed by kernel
708 * Possible range is [8000-FFFF]:0000 (0x8000 values)
710 static u32
qdisc_alloc_handle(struct net_device
*dev
)
713 static u32 autohandle
= TC_H_MAKE(0x80000000U
, 0);
716 autohandle
+= TC_H_MAKE(0x10000U
, 0);
717 if (autohandle
== TC_H_MAKE(TC_H_ROOT
, 0))
718 autohandle
= TC_H_MAKE(0x80000000U
, 0);
719 if (!qdisc_lookup(dev
, autohandle
))
727 void qdisc_tree_reduce_backlog(struct Qdisc
*sch
, unsigned int n
,
730 const struct Qdisc_class_ops
*cops
;
736 if (n
== 0 && len
== 0)
738 drops
= max_t(int, n
, 0);
740 while ((parentid
= sch
->parent
)) {
741 if (TC_H_MAJ(parentid
) == TC_H_MAJ(TC_H_INGRESS
))
744 if (sch
->flags
& TCQ_F_NOPARENT
)
746 /* Notify parent qdisc only if child qdisc becomes empty.
748 * If child was empty even before update then backlog
749 * counter is screwed and we skip notification because
750 * parent class is already passive.
752 notify
= !sch
->q
.qlen
&& !WARN_ON_ONCE(!n
);
753 /* TODO: perform the search on a per txq basis */
754 sch
= qdisc_lookup(qdisc_dev(sch
), TC_H_MAJ(parentid
));
756 WARN_ON_ONCE(parentid
!= TC_H_ROOT
);
759 cops
= sch
->ops
->cl_ops
;
760 if (notify
&& cops
->qlen_notify
) {
761 cl
= cops
->find(sch
, parentid
);
762 cops
->qlen_notify(sch
, cl
);
765 sch
->qstats
.backlog
-= len
;
766 __qdisc_qstats_drop(sch
, drops
);
770 EXPORT_SYMBOL(qdisc_tree_reduce_backlog
);
772 static int tc_fill_qdisc(struct sk_buff
*skb
, struct Qdisc
*q
, u32 clid
,
773 u32 portid
, u32 seq
, u16 flags
, int event
)
775 struct gnet_stats_basic_cpu __percpu
*cpu_bstats
= NULL
;
776 struct gnet_stats_queue __percpu
*cpu_qstats
= NULL
;
778 struct nlmsghdr
*nlh
;
779 unsigned char *b
= skb_tail_pointer(skb
);
781 struct qdisc_size_table
*stab
;
785 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*tcm
), flags
);
788 tcm
= nlmsg_data(nlh
);
789 tcm
->tcm_family
= AF_UNSPEC
;
792 tcm
->tcm_ifindex
= qdisc_dev(q
)->ifindex
;
793 tcm
->tcm_parent
= clid
;
794 tcm
->tcm_handle
= q
->handle
;
795 tcm
->tcm_info
= refcount_read(&q
->refcnt
);
796 if (nla_put_string(skb
, TCA_KIND
, q
->ops
->id
))
797 goto nla_put_failure
;
798 if (q
->ops
->dump
&& q
->ops
->dump(q
, skb
) < 0)
799 goto nla_put_failure
;
802 stab
= rtnl_dereference(q
->stab
);
803 if (stab
&& qdisc_dump_stab(skb
, stab
) < 0)
804 goto nla_put_failure
;
806 if (gnet_stats_start_copy_compat(skb
, TCA_STATS2
, TCA_STATS
, TCA_XSTATS
,
807 NULL
, &d
, TCA_PAD
) < 0)
808 goto nla_put_failure
;
810 if (q
->ops
->dump_stats
&& q
->ops
->dump_stats(q
, &d
) < 0)
811 goto nla_put_failure
;
813 if (qdisc_is_percpu_stats(q
)) {
814 cpu_bstats
= q
->cpu_bstats
;
815 cpu_qstats
= q
->cpu_qstats
;
818 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q
),
819 &d
, cpu_bstats
, &q
->bstats
) < 0 ||
820 gnet_stats_copy_rate_est(&d
, &q
->rate_est
) < 0 ||
821 gnet_stats_copy_queue(&d
, cpu_qstats
, &q
->qstats
, qlen
) < 0)
822 goto nla_put_failure
;
824 if (gnet_stats_finish_copy(&d
) < 0)
825 goto nla_put_failure
;
827 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
836 static bool tc_qdisc_dump_ignore(struct Qdisc
*q
, bool dump_invisible
)
838 if (q
->flags
& TCQ_F_BUILTIN
)
840 if ((q
->flags
& TCQ_F_INVISIBLE
) && !dump_invisible
)
846 static int qdisc_notify(struct net
*net
, struct sk_buff
*oskb
,
847 struct nlmsghdr
*n
, u32 clid
,
848 struct Qdisc
*old
, struct Qdisc
*new)
851 u32 portid
= oskb
? NETLINK_CB(oskb
).portid
: 0;
853 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
857 if (old
&& !tc_qdisc_dump_ignore(old
, false)) {
858 if (tc_fill_qdisc(skb
, old
, clid
, portid
, n
->nlmsg_seq
,
859 0, RTM_DELQDISC
) < 0)
862 if (new && !tc_qdisc_dump_ignore(new, false)) {
863 if (tc_fill_qdisc(skb
, new, clid
, portid
, n
->nlmsg_seq
,
864 old
? NLM_F_REPLACE
: 0, RTM_NEWQDISC
) < 0)
869 return rtnetlink_send(skb
, net
, portid
, RTNLGRP_TC
,
870 n
->nlmsg_flags
& NLM_F_ECHO
);
877 static void notify_and_destroy(struct net
*net
, struct sk_buff
*skb
,
878 struct nlmsghdr
*n
, u32 clid
,
879 struct Qdisc
*old
, struct Qdisc
*new)
882 qdisc_notify(net
, skb
, n
, clid
, old
, new);
888 /* Graft qdisc "new" to class "classid" of qdisc "parent" or
891 * When appropriate send a netlink notification using 'skb'
894 * On success, destroy old qdisc.
897 static int qdisc_graft(struct net_device
*dev
, struct Qdisc
*parent
,
898 struct sk_buff
*skb
, struct nlmsghdr
*n
, u32 classid
,
899 struct Qdisc
*new, struct Qdisc
*old
)
901 struct Qdisc
*q
= old
;
902 struct net
*net
= dev_net(dev
);
905 if (parent
== NULL
) {
906 unsigned int i
, num_q
, ingress
;
909 num_q
= dev
->num_tx_queues
;
910 if ((q
&& q
->flags
& TCQ_F_INGRESS
) ||
911 (new && new->flags
& TCQ_F_INGRESS
)) {
914 if (!dev_ingress_queue(dev
))
918 if (dev
->flags
& IFF_UP
)
921 if (new && new->ops
->attach
)
924 for (i
= 0; i
< num_q
; i
++) {
925 struct netdev_queue
*dev_queue
= dev_ingress_queue(dev
);
928 dev_queue
= netdev_get_tx_queue(dev
, i
);
930 old
= dev_graft_qdisc(dev_queue
, new);
932 qdisc_refcount_inc(new);
940 notify_and_destroy(net
, skb
, n
, classid
,
942 if (new && !new->ops
->attach
)
943 qdisc_refcount_inc(new);
944 dev
->qdisc
= new ? : &noop_qdisc
;
946 if (new && new->ops
->attach
)
947 new->ops
->attach(new);
949 notify_and_destroy(net
, skb
, n
, classid
, old
, new);
952 if (dev
->flags
& IFF_UP
)
955 const struct Qdisc_class_ops
*cops
= parent
->ops
->cl_ops
;
958 if (cops
&& cops
->graft
) {
959 unsigned long cl
= cops
->find(parent
, classid
);
962 err
= cops
->graft(parent
, cl
, new, &old
);
967 notify_and_destroy(net
, skb
, n
, classid
, old
, new);
972 /* lockdep annotation is needed for ingress; egress gets it only for name */
973 static struct lock_class_key qdisc_tx_lock
;
974 static struct lock_class_key qdisc_rx_lock
;
977 Allocate and initialize new qdisc.
979 Parameters are passed via opt.
982 static struct Qdisc
*qdisc_create(struct net_device
*dev
,
983 struct netdev_queue
*dev_queue
,
984 struct Qdisc
*p
, u32 parent
, u32 handle
,
985 struct nlattr
**tca
, int *errp
)
988 struct nlattr
*kind
= tca
[TCA_KIND
];
990 struct Qdisc_ops
*ops
;
991 struct qdisc_size_table
*stab
;
993 ops
= qdisc_lookup_ops(kind
);
994 #ifdef CONFIG_MODULES
995 if (ops
== NULL
&& kind
!= NULL
) {
997 if (nla_strlcpy(name
, kind
, IFNAMSIZ
) < IFNAMSIZ
) {
998 /* We dropped the RTNL semaphore in order to
999 * perform the module load. So, even if we
1000 * succeeded in loading the module we have to
1001 * tell the caller to replay the request. We
1002 * indicate this using -EAGAIN.
1003 * We replay the request because the device may
1004 * go away in the mean time.
1007 request_module("sch_%s", name
);
1009 ops
= qdisc_lookup_ops(kind
);
1011 /* We will try again qdisc_lookup_ops,
1012 * so don't keep a reference.
1014 module_put(ops
->owner
);
1026 sch
= qdisc_alloc(dev_queue
, ops
);
1032 sch
->parent
= parent
;
1034 if (handle
== TC_H_INGRESS
) {
1035 sch
->flags
|= TCQ_F_INGRESS
;
1036 handle
= TC_H_MAKE(TC_H_INGRESS
, 0);
1037 lockdep_set_class(qdisc_lock(sch
), &qdisc_rx_lock
);
1040 handle
= qdisc_alloc_handle(dev
);
1045 lockdep_set_class(qdisc_lock(sch
), &qdisc_tx_lock
);
1046 if (!netif_is_multiqueue(dev
))
1047 sch
->flags
|= TCQ_F_ONETXQUEUE
;
1050 sch
->handle
= handle
;
1052 /* This exist to keep backward compatible with a userspace
1053 * loophole, what allowed userspace to get IFF_NO_QUEUE
1054 * facility on older kernels by setting tx_queue_len=0 (prior
1055 * to qdisc init), and then forgot to reinit tx_queue_len
1056 * before again attaching a qdisc.
1058 if ((dev
->priv_flags
& IFF_NO_QUEUE
) && (dev
->tx_queue_len
== 0)) {
1059 dev
->tx_queue_len
= DEFAULT_TX_QUEUE_LEN
;
1060 netdev_info(dev
, "Caught tx_queue_len zero misconfig\n");
1063 if (!ops
->init
|| (err
= ops
->init(sch
, tca
[TCA_OPTIONS
])) == 0) {
1064 if (qdisc_is_percpu_stats(sch
)) {
1066 netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu
);
1067 if (!sch
->cpu_bstats
)
1070 sch
->cpu_qstats
= alloc_percpu(struct gnet_stats_queue
);
1071 if (!sch
->cpu_qstats
)
1075 if (tca
[TCA_STAB
]) {
1076 stab
= qdisc_get_stab(tca
[TCA_STAB
]);
1078 err
= PTR_ERR(stab
);
1081 rcu_assign_pointer(sch
->stab
, stab
);
1083 if (tca
[TCA_RATE
]) {
1084 seqcount_t
*running
;
1087 if (sch
->flags
& TCQ_F_MQROOT
)
1090 if ((sch
->parent
!= TC_H_ROOT
) &&
1091 !(sch
->flags
& TCQ_F_INGRESS
) &&
1092 (!p
|| !(p
->flags
& TCQ_F_MQROOT
)))
1093 running
= qdisc_root_sleeping_running(sch
);
1095 running
= &sch
->running
;
1097 err
= gen_new_estimator(&sch
->bstats
,
1107 qdisc_hash_add(sch
, false);
1111 /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */
1116 kfree((char *) sch
- sch
->padded
);
1118 module_put(ops
->owner
);
1124 free_percpu(sch
->cpu_bstats
);
1125 free_percpu(sch
->cpu_qstats
);
1127 * Any broken qdiscs that would require a ops->reset() here?
1128 * The qdisc was never in action so it shouldn't be necessary.
1130 qdisc_put_stab(rtnl_dereference(sch
->stab
));
1136 static int qdisc_change(struct Qdisc
*sch
, struct nlattr
**tca
)
1138 struct qdisc_size_table
*ostab
, *stab
= NULL
;
1141 if (tca
[TCA_OPTIONS
]) {
1142 if (sch
->ops
->change
== NULL
)
1144 err
= sch
->ops
->change(sch
, tca
[TCA_OPTIONS
]);
1149 if (tca
[TCA_STAB
]) {
1150 stab
= qdisc_get_stab(tca
[TCA_STAB
]);
1152 return PTR_ERR(stab
);
1155 ostab
= rtnl_dereference(sch
->stab
);
1156 rcu_assign_pointer(sch
->stab
, stab
);
1157 qdisc_put_stab(ostab
);
1159 if (tca
[TCA_RATE
]) {
1160 /* NB: ignores errors from replace_estimator
1161 because change can't be undone. */
1162 if (sch
->flags
& TCQ_F_MQROOT
)
1164 gen_replace_estimator(&sch
->bstats
,
1168 qdisc_root_sleeping_running(sch
),
1175 struct check_loop_arg
{
1176 struct qdisc_walker w
;
1181 static int check_loop_fn(struct Qdisc
*q
, unsigned long cl
,
1182 struct qdisc_walker
*w
);
1184 static int check_loop(struct Qdisc
*q
, struct Qdisc
*p
, int depth
)
1186 struct check_loop_arg arg
;
1188 if (q
->ops
->cl_ops
== NULL
)
1191 arg
.w
.stop
= arg
.w
.skip
= arg
.w
.count
= 0;
1192 arg
.w
.fn
= check_loop_fn
;
1195 q
->ops
->cl_ops
->walk(q
, &arg
.w
);
1196 return arg
.w
.stop
? -ELOOP
: 0;
1200 check_loop_fn(struct Qdisc
*q
, unsigned long cl
, struct qdisc_walker
*w
)
1203 const struct Qdisc_class_ops
*cops
= q
->ops
->cl_ops
;
1204 struct check_loop_arg
*arg
= (struct check_loop_arg
*)w
;
1206 leaf
= cops
->leaf(q
, cl
);
1208 if (leaf
== arg
->p
|| arg
->depth
> 7)
1210 return check_loop(leaf
, arg
->p
, arg
->depth
+ 1);
1219 static int tc_get_qdisc(struct sk_buff
*skb
, struct nlmsghdr
*n
,
1220 struct netlink_ext_ack
*extack
)
1222 struct net
*net
= sock_net(skb
->sk
);
1223 struct tcmsg
*tcm
= nlmsg_data(n
);
1224 struct nlattr
*tca
[TCA_MAX
+ 1];
1225 struct net_device
*dev
;
1227 struct Qdisc
*q
= NULL
;
1228 struct Qdisc
*p
= NULL
;
1231 if ((n
->nlmsg_type
!= RTM_GETQDISC
) &&
1232 !netlink_ns_capable(skb
, net
->user_ns
, CAP_NET_ADMIN
))
1235 err
= nlmsg_parse(n
, sizeof(*tcm
), tca
, TCA_MAX
, NULL
, extack
);
1239 dev
= __dev_get_by_index(net
, tcm
->tcm_ifindex
);
1243 clid
= tcm
->tcm_parent
;
1245 if (clid
!= TC_H_ROOT
) {
1246 if (TC_H_MAJ(clid
) != TC_H_MAJ(TC_H_INGRESS
)) {
1247 p
= qdisc_lookup(dev
, TC_H_MAJ(clid
));
1250 q
= qdisc_leaf(p
, clid
);
1251 } else if (dev_ingress_queue(dev
)) {
1252 q
= dev_ingress_queue(dev
)->qdisc_sleeping
;
1260 if (tcm
->tcm_handle
&& q
->handle
!= tcm
->tcm_handle
)
1263 q
= qdisc_lookup(dev
, tcm
->tcm_handle
);
1268 if (tca
[TCA_KIND
] && nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))
1271 if (n
->nlmsg_type
== RTM_DELQDISC
) {
1276 err
= qdisc_graft(dev
, p
, skb
, n
, clid
, NULL
, q
);
1280 qdisc_notify(net
, skb
, n
, clid
, NULL
, q
);
1286 * Create/change qdisc.
1289 static int tc_modify_qdisc(struct sk_buff
*skb
, struct nlmsghdr
*n
,
1290 struct netlink_ext_ack
*extack
)
1292 struct net
*net
= sock_net(skb
->sk
);
1294 struct nlattr
*tca
[TCA_MAX
+ 1];
1295 struct net_device
*dev
;
1297 struct Qdisc
*q
, *p
;
1300 if (!netlink_ns_capable(skb
, net
->user_ns
, CAP_NET_ADMIN
))
1304 /* Reinit, just in case something touches this. */
1305 err
= nlmsg_parse(n
, sizeof(*tcm
), tca
, TCA_MAX
, NULL
, extack
);
1309 tcm
= nlmsg_data(n
);
1310 clid
= tcm
->tcm_parent
;
1313 dev
= __dev_get_by_index(net
, tcm
->tcm_ifindex
);
1319 if (clid
!= TC_H_ROOT
) {
1320 if (clid
!= TC_H_INGRESS
) {
1321 p
= qdisc_lookup(dev
, TC_H_MAJ(clid
));
1324 q
= qdisc_leaf(p
, clid
);
1325 } else if (dev_ingress_queue_create(dev
)) {
1326 q
= dev_ingress_queue(dev
)->qdisc_sleeping
;
1332 /* It may be default qdisc, ignore it */
1333 if (q
&& q
->handle
== 0)
1336 if (!q
|| !tcm
->tcm_handle
|| q
->handle
!= tcm
->tcm_handle
) {
1337 if (tcm
->tcm_handle
) {
1338 if (q
&& !(n
->nlmsg_flags
& NLM_F_REPLACE
))
1340 if (TC_H_MIN(tcm
->tcm_handle
))
1342 q
= qdisc_lookup(dev
, tcm
->tcm_handle
);
1344 goto create_n_graft
;
1345 if (n
->nlmsg_flags
& NLM_F_EXCL
)
1347 if (tca
[TCA_KIND
] && nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))
1350 (p
&& check_loop(q
, p
, 0)))
1352 qdisc_refcount_inc(q
);
1356 goto create_n_graft
;
1358 /* This magic test requires explanation.
1360 * We know, that some child q is already
1361 * attached to this parent and have choice:
1362 * either to change it or to create/graft new one.
1364 * 1. We are allowed to create/graft only
1365 * if CREATE and REPLACE flags are set.
1367 * 2. If EXCL is set, requestor wanted to say,
1368 * that qdisc tcm_handle is not expected
1369 * to exist, so that we choose create/graft too.
1371 * 3. The last case is when no flags are set.
1372 * Alas, it is sort of hole in API, we
1373 * cannot decide what to do unambiguously.
1374 * For now we select create/graft, if
1375 * user gave KIND, which does not match existing.
1377 if ((n
->nlmsg_flags
& NLM_F_CREATE
) &&
1378 (n
->nlmsg_flags
& NLM_F_REPLACE
) &&
1379 ((n
->nlmsg_flags
& NLM_F_EXCL
) ||
1381 nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))))
1382 goto create_n_graft
;
1386 if (!tcm
->tcm_handle
)
1388 q
= qdisc_lookup(dev
, tcm
->tcm_handle
);
1391 /* Change qdisc parameters */
1394 if (n
->nlmsg_flags
& NLM_F_EXCL
)
1396 if (tca
[TCA_KIND
] && nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))
1398 err
= qdisc_change(q
, tca
);
1400 qdisc_notify(net
, skb
, n
, clid
, NULL
, q
);
1404 if (!(n
->nlmsg_flags
& NLM_F_CREATE
))
1406 if (clid
== TC_H_INGRESS
) {
1407 if (dev_ingress_queue(dev
))
1408 q
= qdisc_create(dev
, dev_ingress_queue(dev
), p
,
1409 tcm
->tcm_parent
, tcm
->tcm_parent
,
1414 struct netdev_queue
*dev_queue
;
1416 if (p
&& p
->ops
->cl_ops
&& p
->ops
->cl_ops
->select_queue
)
1417 dev_queue
= p
->ops
->cl_ops
->select_queue(p
, tcm
);
1419 dev_queue
= p
->dev_queue
;
1421 dev_queue
= netdev_get_tx_queue(dev
, 0);
1423 q
= qdisc_create(dev
, dev_queue
, p
,
1424 tcm
->tcm_parent
, tcm
->tcm_handle
,
1434 err
= qdisc_graft(dev
, p
, skb
, n
, clid
, q
, NULL
);
1444 static int tc_dump_qdisc_root(struct Qdisc
*root
, struct sk_buff
*skb
,
1445 struct netlink_callback
*cb
,
1446 int *q_idx_p
, int s_q_idx
, bool recur
,
1447 bool dump_invisible
)
1449 int ret
= 0, q_idx
= *q_idx_p
;
1457 if (q_idx
< s_q_idx
) {
1460 if (!tc_qdisc_dump_ignore(q
, dump_invisible
) &&
1461 tc_fill_qdisc(skb
, q
, q
->parent
, NETLINK_CB(cb
->skb
).portid
,
1462 cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
,
1468 /* If dumping singletons, there is no qdisc_dev(root) and the singleton
1469 * itself has already been dumped.
1471 * If we've already dumped the top-level (ingress) qdisc above and the global
1472 * qdisc hashtable, we don't want to hit it again
1474 if (!qdisc_dev(root
) || !recur
)
1477 hash_for_each(qdisc_dev(root
)->qdisc_hash
, b
, q
, hash
) {
1478 if (q_idx
< s_q_idx
) {
1482 if (!tc_qdisc_dump_ignore(q
, dump_invisible
) &&
1483 tc_fill_qdisc(skb
, q
, q
->parent
, NETLINK_CB(cb
->skb
).portid
,
1484 cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
,
1498 static int tc_dump_qdisc(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1500 struct net
*net
= sock_net(skb
->sk
);
1503 struct net_device
*dev
;
1504 const struct nlmsghdr
*nlh
= cb
->nlh
;
1505 struct nlattr
*tca
[TCA_MAX
+ 1];
1508 s_idx
= cb
->args
[0];
1509 s_q_idx
= q_idx
= cb
->args
[1];
1514 err
= nlmsg_parse(nlh
, sizeof(struct tcmsg
), tca
, TCA_MAX
, NULL
, NULL
);
1518 for_each_netdev(net
, dev
) {
1519 struct netdev_queue
*dev_queue
;
1527 if (tc_dump_qdisc_root(dev
->qdisc
, skb
, cb
, &q_idx
, s_q_idx
,
1528 true, tca
[TCA_DUMP_INVISIBLE
]) < 0)
1531 dev_queue
= dev_ingress_queue(dev
);
1533 tc_dump_qdisc_root(dev_queue
->qdisc_sleeping
, skb
, cb
,
1534 &q_idx
, s_q_idx
, false,
1535 tca
[TCA_DUMP_INVISIBLE
]) < 0)
1544 cb
->args
[1] = q_idx
;
1551 /************************************************
1552 * Traffic classes manipulation. *
1553 ************************************************/
1555 static int tc_fill_tclass(struct sk_buff
*skb
, struct Qdisc
*q
,
1557 u32 portid
, u32 seq
, u16 flags
, int event
)
1560 struct nlmsghdr
*nlh
;
1561 unsigned char *b
= skb_tail_pointer(skb
);
1563 const struct Qdisc_class_ops
*cl_ops
= q
->ops
->cl_ops
;
1566 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*tcm
), flags
);
1568 goto out_nlmsg_trim
;
1569 tcm
= nlmsg_data(nlh
);
1570 tcm
->tcm_family
= AF_UNSPEC
;
1573 tcm
->tcm_ifindex
= qdisc_dev(q
)->ifindex
;
1574 tcm
->tcm_parent
= q
->handle
;
1575 tcm
->tcm_handle
= q
->handle
;
1577 if (nla_put_string(skb
, TCA_KIND
, q
->ops
->id
))
1578 goto nla_put_failure
;
1579 if (cl_ops
->dump
&& cl_ops
->dump(q
, cl
, skb
, tcm
) < 0)
1580 goto nla_put_failure
;
1582 if (gnet_stats_start_copy_compat(skb
, TCA_STATS2
, TCA_STATS
, TCA_XSTATS
,
1583 NULL
, &d
, TCA_PAD
) < 0)
1584 goto nla_put_failure
;
1586 if (cl_ops
->dump_stats
&& cl_ops
->dump_stats(q
, cl
, &d
) < 0)
1587 goto nla_put_failure
;
1589 if (gnet_stats_finish_copy(&d
) < 0)
1590 goto nla_put_failure
;
1592 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
1601 static int tclass_notify(struct net
*net
, struct sk_buff
*oskb
,
1602 struct nlmsghdr
*n
, struct Qdisc
*q
,
1603 unsigned long cl
, int event
)
1605 struct sk_buff
*skb
;
1606 u32 portid
= oskb
? NETLINK_CB(oskb
).portid
: 0;
1608 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1612 if (tc_fill_tclass(skb
, q
, cl
, portid
, n
->nlmsg_seq
, 0, event
) < 0) {
1617 return rtnetlink_send(skb
, net
, portid
, RTNLGRP_TC
,
1618 n
->nlmsg_flags
& NLM_F_ECHO
);
1621 static int tclass_del_notify(struct net
*net
,
1622 const struct Qdisc_class_ops
*cops
,
1623 struct sk_buff
*oskb
, struct nlmsghdr
*n
,
1624 struct Qdisc
*q
, unsigned long cl
)
1626 u32 portid
= oskb
? NETLINK_CB(oskb
).portid
: 0;
1627 struct sk_buff
*skb
;
1633 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1637 if (tc_fill_tclass(skb
, q
, cl
, portid
, n
->nlmsg_seq
, 0,
1638 RTM_DELTCLASS
) < 0) {
1643 err
= cops
->delete(q
, cl
);
1649 return rtnetlink_send(skb
, net
, portid
, RTNLGRP_TC
,
1650 n
->nlmsg_flags
& NLM_F_ECHO
);
1653 #ifdef CONFIG_NET_CLS
1655 struct tcf_bind_args
{
1656 struct tcf_walker w
;
1661 static int tcf_node_bind(struct tcf_proto
*tp
, void *n
, struct tcf_walker
*arg
)
1663 struct tcf_bind_args
*a
= (void *)arg
;
1665 if (tp
->ops
->bind_class
) {
1666 struct Qdisc
*q
= tcf_block_q(tp
->chain
->block
);
1669 tp
->ops
->bind_class(n
, a
->classid
, a
->cl
);
1675 static void tc_bind_tclass(struct Qdisc
*q
, u32 portid
, u32 clid
,
1676 unsigned long new_cl
)
1678 const struct Qdisc_class_ops
*cops
= q
->ops
->cl_ops
;
1679 struct tcf_block
*block
;
1680 struct tcf_chain
*chain
;
1683 cl
= cops
->find(q
, portid
);
1686 block
= cops
->tcf_block(q
, cl
);
1689 list_for_each_entry(chain
, &block
->chain_list
, list
) {
1690 struct tcf_proto
*tp
;
1692 for (tp
= rtnl_dereference(chain
->filter_chain
);
1693 tp
; tp
= rtnl_dereference(tp
->next
)) {
1694 struct tcf_bind_args arg
= {};
1696 arg
.w
.fn
= tcf_node_bind
;
1699 tp
->ops
->walk(tp
, &arg
.w
);
1706 static void tc_bind_tclass(struct Qdisc
*q
, u32 portid
, u32 clid
,
1707 unsigned long new_cl
)
1713 static int tc_ctl_tclass(struct sk_buff
*skb
, struct nlmsghdr
*n
,
1714 struct netlink_ext_ack
*extack
)
1716 struct net
*net
= sock_net(skb
->sk
);
1717 struct tcmsg
*tcm
= nlmsg_data(n
);
1718 struct nlattr
*tca
[TCA_MAX
+ 1];
1719 struct net_device
*dev
;
1720 struct Qdisc
*q
= NULL
;
1721 const struct Qdisc_class_ops
*cops
;
1722 unsigned long cl
= 0;
1723 unsigned long new_cl
;
1729 if ((n
->nlmsg_type
!= RTM_GETTCLASS
) &&
1730 !netlink_ns_capable(skb
, net
->user_ns
, CAP_NET_ADMIN
))
1733 err
= nlmsg_parse(n
, sizeof(*tcm
), tca
, TCA_MAX
, NULL
, extack
);
1737 dev
= __dev_get_by_index(net
, tcm
->tcm_ifindex
);
1742 parent == TC_H_UNSPEC - unspecified parent.
1743 parent == TC_H_ROOT - class is root, which has no parent.
1744 parent == X:0 - parent is root class.
1745 parent == X:Y - parent is a node in hierarchy.
1746 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1748 handle == 0:0 - generate handle from kernel pool.
1749 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1750 handle == X:Y - clear.
1751 handle == X:0 - root class.
1754 /* Step 1. Determine qdisc handle X:0 */
1756 portid
= tcm
->tcm_parent
;
1757 clid
= tcm
->tcm_handle
;
1758 qid
= TC_H_MAJ(clid
);
1760 if (portid
!= TC_H_ROOT
) {
1761 u32 qid1
= TC_H_MAJ(portid
);
1764 /* If both majors are known, they must be identical. */
1769 } else if (qid
== 0)
1770 qid
= dev
->qdisc
->handle
;
1772 /* Now qid is genuine qdisc handle consistent
1773 * both with parent and child.
1775 * TC_H_MAJ(portid) still may be unspecified, complete it now.
1778 portid
= TC_H_MAKE(qid
, portid
);
1781 qid
= dev
->qdisc
->handle
;
1784 /* OK. Locate qdisc */
1785 q
= qdisc_lookup(dev
, qid
);
1789 /* An check that it supports classes */
1790 cops
= q
->ops
->cl_ops
;
1794 /* Now try to get class */
1796 if (portid
== TC_H_ROOT
)
1799 clid
= TC_H_MAKE(qid
, clid
);
1802 cl
= cops
->find(q
, clid
);
1806 if (n
->nlmsg_type
!= RTM_NEWTCLASS
||
1807 !(n
->nlmsg_flags
& NLM_F_CREATE
))
1810 switch (n
->nlmsg_type
) {
1813 if (n
->nlmsg_flags
& NLM_F_EXCL
)
1817 err
= tclass_del_notify(net
, cops
, skb
, n
, q
, cl
);
1818 /* Unbind the class with flilters with 0 */
1819 tc_bind_tclass(q
, portid
, clid
, 0);
1822 err
= tclass_notify(net
, skb
, n
, q
, cl
, RTM_NEWTCLASS
);
1833 err
= cops
->change(q
, clid
, portid
, tca
, &new_cl
);
1835 tclass_notify(net
, skb
, n
, q
, new_cl
, RTM_NEWTCLASS
);
1836 /* We just create a new class, need to do reverse binding. */
1838 tc_bind_tclass(q
, portid
, clid
, new_cl
);
1844 struct qdisc_dump_args
{
1845 struct qdisc_walker w
;
1846 struct sk_buff
*skb
;
1847 struct netlink_callback
*cb
;
1850 static int qdisc_class_dump(struct Qdisc
*q
, unsigned long cl
,
1851 struct qdisc_walker
*arg
)
1853 struct qdisc_dump_args
*a
= (struct qdisc_dump_args
*)arg
;
1855 return tc_fill_tclass(a
->skb
, q
, cl
, NETLINK_CB(a
->cb
->skb
).portid
,
1856 a
->cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
,
1860 static int tc_dump_tclass_qdisc(struct Qdisc
*q
, struct sk_buff
*skb
,
1861 struct tcmsg
*tcm
, struct netlink_callback
*cb
,
1864 struct qdisc_dump_args arg
;
1866 if (tc_qdisc_dump_ignore(q
, false) ||
1867 *t_p
< s_t
|| !q
->ops
->cl_ops
||
1869 TC_H_MAJ(tcm
->tcm_parent
) != q
->handle
)) {
1874 memset(&cb
->args
[1], 0, sizeof(cb
->args
)-sizeof(cb
->args
[0]));
1875 arg
.w
.fn
= qdisc_class_dump
;
1879 arg
.w
.skip
= cb
->args
[1];
1881 q
->ops
->cl_ops
->walk(q
, &arg
.w
);
1882 cb
->args
[1] = arg
.w
.count
;
1889 static int tc_dump_tclass_root(struct Qdisc
*root
, struct sk_buff
*skb
,
1890 struct tcmsg
*tcm
, struct netlink_callback
*cb
,
1899 if (tc_dump_tclass_qdisc(root
, skb
, tcm
, cb
, t_p
, s_t
) < 0)
1902 if (!qdisc_dev(root
))
1905 if (tcm
->tcm_parent
) {
1906 q
= qdisc_match_from_root(root
, TC_H_MAJ(tcm
->tcm_parent
));
1907 if (q
&& tc_dump_tclass_qdisc(q
, skb
, tcm
, cb
, t_p
, s_t
) < 0)
1911 hash_for_each(qdisc_dev(root
)->qdisc_hash
, b
, q
, hash
) {
1912 if (tc_dump_tclass_qdisc(q
, skb
, tcm
, cb
, t_p
, s_t
) < 0)
1919 static int tc_dump_tclass(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1921 struct tcmsg
*tcm
= nlmsg_data(cb
->nlh
);
1922 struct net
*net
= sock_net(skb
->sk
);
1923 struct netdev_queue
*dev_queue
;
1924 struct net_device
*dev
;
1927 if (nlmsg_len(cb
->nlh
) < sizeof(*tcm
))
1929 dev
= dev_get_by_index(net
, tcm
->tcm_ifindex
);
1936 if (tc_dump_tclass_root(dev
->qdisc
, skb
, tcm
, cb
, &t
, s_t
) < 0)
1939 dev_queue
= dev_ingress_queue(dev
);
1941 tc_dump_tclass_root(dev_queue
->qdisc_sleeping
, skb
, tcm
, cb
,
1952 #ifdef CONFIG_PROC_FS
1953 static int psched_show(struct seq_file
*seq
, void *v
)
1955 seq_printf(seq
, "%08x %08x %08x %08x\n",
1956 (u32
)NSEC_PER_USEC
, (u32
)PSCHED_TICKS2NS(1),
1958 (u32
)NSEC_PER_SEC
/ hrtimer_resolution
);
1963 static int psched_open(struct inode
*inode
, struct file
*file
)
1965 return single_open(file
, psched_show
, NULL
);
1968 static const struct file_operations psched_fops
= {
1969 .owner
= THIS_MODULE
,
1970 .open
= psched_open
,
1972 .llseek
= seq_lseek
,
1973 .release
= single_release
,
1976 static int __net_init
psched_net_init(struct net
*net
)
1978 struct proc_dir_entry
*e
;
1980 e
= proc_create("psched", 0, net
->proc_net
, &psched_fops
);
1987 static void __net_exit
psched_net_exit(struct net
*net
)
1989 remove_proc_entry("psched", net
->proc_net
);
1992 static int __net_init
psched_net_init(struct net
*net
)
1997 static void __net_exit
psched_net_exit(struct net
*net
)
2002 static struct pernet_operations psched_net_ops
= {
2003 .init
= psched_net_init
,
2004 .exit
= psched_net_exit
,
2007 static int __init
pktsched_init(void)
2011 err
= register_pernet_subsys(&psched_net_ops
);
2013 pr_err("pktsched_init: "
2014 "cannot initialize per netns operations\n");
2018 register_qdisc(&pfifo_fast_ops
);
2019 register_qdisc(&pfifo_qdisc_ops
);
2020 register_qdisc(&bfifo_qdisc_ops
);
2021 register_qdisc(&pfifo_head_drop_qdisc_ops
);
2022 register_qdisc(&mq_qdisc_ops
);
2023 register_qdisc(&noqueue_qdisc_ops
);
2025 rtnl_register(PF_UNSPEC
, RTM_NEWQDISC
, tc_modify_qdisc
, NULL
, 0);
2026 rtnl_register(PF_UNSPEC
, RTM_DELQDISC
, tc_get_qdisc
, NULL
, 0);
2027 rtnl_register(PF_UNSPEC
, RTM_GETQDISC
, tc_get_qdisc
, tc_dump_qdisc
,
2029 rtnl_register(PF_UNSPEC
, RTM_NEWTCLASS
, tc_ctl_tclass
, NULL
, 0);
2030 rtnl_register(PF_UNSPEC
, RTM_DELTCLASS
, tc_ctl_tclass
, NULL
, 0);
2031 rtnl_register(PF_UNSPEC
, RTM_GETTCLASS
, tc_ctl_tclass
, tc_dump_tclass
,
2037 subsys_initcall(pktsched_init
);