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 (nla_put_u8(skb
, TCA_HW_OFFLOAD
, !!(q
->flags
& TCQ_F_OFFLOADED
)))
799 goto nla_put_failure
;
800 if (q
->ops
->dump
&& q
->ops
->dump(q
, skb
) < 0)
801 goto nla_put_failure
;
804 stab
= rtnl_dereference(q
->stab
);
805 if (stab
&& qdisc_dump_stab(skb
, stab
) < 0)
806 goto nla_put_failure
;
808 if (gnet_stats_start_copy_compat(skb
, TCA_STATS2
, TCA_STATS
, TCA_XSTATS
,
809 NULL
, &d
, TCA_PAD
) < 0)
810 goto nla_put_failure
;
812 if (q
->ops
->dump_stats
&& q
->ops
->dump_stats(q
, &d
) < 0)
813 goto nla_put_failure
;
815 if (qdisc_is_percpu_stats(q
)) {
816 cpu_bstats
= q
->cpu_bstats
;
817 cpu_qstats
= q
->cpu_qstats
;
820 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q
),
821 &d
, cpu_bstats
, &q
->bstats
) < 0 ||
822 gnet_stats_copy_rate_est(&d
, &q
->rate_est
) < 0 ||
823 gnet_stats_copy_queue(&d
, cpu_qstats
, &q
->qstats
, qlen
) < 0)
824 goto nla_put_failure
;
826 if (gnet_stats_finish_copy(&d
) < 0)
827 goto nla_put_failure
;
829 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
838 static bool tc_qdisc_dump_ignore(struct Qdisc
*q
, bool dump_invisible
)
840 if (q
->flags
& TCQ_F_BUILTIN
)
842 if ((q
->flags
& TCQ_F_INVISIBLE
) && !dump_invisible
)
848 static int qdisc_notify(struct net
*net
, struct sk_buff
*oskb
,
849 struct nlmsghdr
*n
, u32 clid
,
850 struct Qdisc
*old
, struct Qdisc
*new)
853 u32 portid
= oskb
? NETLINK_CB(oskb
).portid
: 0;
855 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
859 if (old
&& !tc_qdisc_dump_ignore(old
, false)) {
860 if (tc_fill_qdisc(skb
, old
, clid
, portid
, n
->nlmsg_seq
,
861 0, RTM_DELQDISC
) < 0)
864 if (new && !tc_qdisc_dump_ignore(new, false)) {
865 if (tc_fill_qdisc(skb
, new, clid
, portid
, n
->nlmsg_seq
,
866 old
? NLM_F_REPLACE
: 0, RTM_NEWQDISC
) < 0)
871 return rtnetlink_send(skb
, net
, portid
, RTNLGRP_TC
,
872 n
->nlmsg_flags
& NLM_F_ECHO
);
879 static void notify_and_destroy(struct net
*net
, struct sk_buff
*skb
,
880 struct nlmsghdr
*n
, u32 clid
,
881 struct Qdisc
*old
, struct Qdisc
*new)
884 qdisc_notify(net
, skb
, n
, clid
, old
, new);
890 /* Graft qdisc "new" to class "classid" of qdisc "parent" or
893 * When appropriate send a netlink notification using 'skb'
896 * On success, destroy old qdisc.
899 static int qdisc_graft(struct net_device
*dev
, struct Qdisc
*parent
,
900 struct sk_buff
*skb
, struct nlmsghdr
*n
, u32 classid
,
901 struct Qdisc
*new, struct Qdisc
*old
)
903 struct Qdisc
*q
= old
;
904 struct net
*net
= dev_net(dev
);
907 if (parent
== NULL
) {
908 unsigned int i
, num_q
, ingress
;
911 num_q
= dev
->num_tx_queues
;
912 if ((q
&& q
->flags
& TCQ_F_INGRESS
) ||
913 (new && new->flags
& TCQ_F_INGRESS
)) {
916 if (!dev_ingress_queue(dev
))
920 if (dev
->flags
& IFF_UP
)
923 if (new && new->ops
->attach
)
926 for (i
= 0; i
< num_q
; i
++) {
927 struct netdev_queue
*dev_queue
= dev_ingress_queue(dev
);
930 dev_queue
= netdev_get_tx_queue(dev
, i
);
932 old
= dev_graft_qdisc(dev_queue
, new);
934 qdisc_refcount_inc(new);
942 notify_and_destroy(net
, skb
, n
, classid
,
944 if (new && !new->ops
->attach
)
945 qdisc_refcount_inc(new);
946 dev
->qdisc
= new ? : &noop_qdisc
;
948 if (new && new->ops
->attach
)
949 new->ops
->attach(new);
951 notify_and_destroy(net
, skb
, n
, classid
, old
, new);
954 if (dev
->flags
& IFF_UP
)
957 const struct Qdisc_class_ops
*cops
= parent
->ops
->cl_ops
;
960 if (cops
&& cops
->graft
) {
961 unsigned long cl
= cops
->find(parent
, classid
);
964 err
= cops
->graft(parent
, cl
, new, &old
);
969 notify_and_destroy(net
, skb
, n
, classid
, old
, new);
974 /* lockdep annotation is needed for ingress; egress gets it only for name */
975 static struct lock_class_key qdisc_tx_lock
;
976 static struct lock_class_key qdisc_rx_lock
;
979 Allocate and initialize new qdisc.
981 Parameters are passed via opt.
984 static struct Qdisc
*qdisc_create(struct net_device
*dev
,
985 struct netdev_queue
*dev_queue
,
986 struct Qdisc
*p
, u32 parent
, u32 handle
,
987 struct nlattr
**tca
, int *errp
)
990 struct nlattr
*kind
= tca
[TCA_KIND
];
992 struct Qdisc_ops
*ops
;
993 struct qdisc_size_table
*stab
;
995 ops
= qdisc_lookup_ops(kind
);
996 #ifdef CONFIG_MODULES
997 if (ops
== NULL
&& kind
!= NULL
) {
999 if (nla_strlcpy(name
, kind
, IFNAMSIZ
) < IFNAMSIZ
) {
1000 /* We dropped the RTNL semaphore in order to
1001 * perform the module load. So, even if we
1002 * succeeded in loading the module we have to
1003 * tell the caller to replay the request. We
1004 * indicate this using -EAGAIN.
1005 * We replay the request because the device may
1006 * go away in the mean time.
1009 request_module("sch_%s", name
);
1011 ops
= qdisc_lookup_ops(kind
);
1013 /* We will try again qdisc_lookup_ops,
1014 * so don't keep a reference.
1016 module_put(ops
->owner
);
1028 sch
= qdisc_alloc(dev_queue
, ops
);
1034 sch
->parent
= parent
;
1036 if (handle
== TC_H_INGRESS
) {
1037 sch
->flags
|= TCQ_F_INGRESS
;
1038 handle
= TC_H_MAKE(TC_H_INGRESS
, 0);
1039 lockdep_set_class(qdisc_lock(sch
), &qdisc_rx_lock
);
1042 handle
= qdisc_alloc_handle(dev
);
1047 lockdep_set_class(qdisc_lock(sch
), &qdisc_tx_lock
);
1048 if (!netif_is_multiqueue(dev
))
1049 sch
->flags
|= TCQ_F_ONETXQUEUE
;
1052 sch
->handle
= handle
;
1054 /* This exist to keep backward compatible with a userspace
1055 * loophole, what allowed userspace to get IFF_NO_QUEUE
1056 * facility on older kernels by setting tx_queue_len=0 (prior
1057 * to qdisc init), and then forgot to reinit tx_queue_len
1058 * before again attaching a qdisc.
1060 if ((dev
->priv_flags
& IFF_NO_QUEUE
) && (dev
->tx_queue_len
== 0)) {
1061 dev
->tx_queue_len
= DEFAULT_TX_QUEUE_LEN
;
1062 netdev_info(dev
, "Caught tx_queue_len zero misconfig\n");
1065 if (!ops
->init
|| (err
= ops
->init(sch
, tca
[TCA_OPTIONS
])) == 0) {
1066 if (tca
[TCA_STAB
]) {
1067 stab
= qdisc_get_stab(tca
[TCA_STAB
]);
1069 err
= PTR_ERR(stab
);
1072 rcu_assign_pointer(sch
->stab
, stab
);
1074 if (tca
[TCA_RATE
]) {
1075 seqcount_t
*running
;
1078 if (sch
->flags
& TCQ_F_MQROOT
)
1081 if ((sch
->parent
!= TC_H_ROOT
) &&
1082 !(sch
->flags
& TCQ_F_INGRESS
) &&
1083 (!p
|| !(p
->flags
& TCQ_F_MQROOT
)))
1084 running
= qdisc_root_sleeping_running(sch
);
1086 running
= &sch
->running
;
1088 err
= gen_new_estimator(&sch
->bstats
,
1098 qdisc_hash_add(sch
, false);
1102 /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */
1109 module_put(ops
->owner
);
1116 * Any broken qdiscs that would require a ops->reset() here?
1117 * The qdisc was never in action so it shouldn't be necessary.
1119 qdisc_put_stab(rtnl_dereference(sch
->stab
));
1125 static int qdisc_change(struct Qdisc
*sch
, struct nlattr
**tca
)
1127 struct qdisc_size_table
*ostab
, *stab
= NULL
;
1130 if (tca
[TCA_OPTIONS
]) {
1131 if (sch
->ops
->change
== NULL
)
1133 err
= sch
->ops
->change(sch
, tca
[TCA_OPTIONS
]);
1138 if (tca
[TCA_STAB
]) {
1139 stab
= qdisc_get_stab(tca
[TCA_STAB
]);
1141 return PTR_ERR(stab
);
1144 ostab
= rtnl_dereference(sch
->stab
);
1145 rcu_assign_pointer(sch
->stab
, stab
);
1146 qdisc_put_stab(ostab
);
1148 if (tca
[TCA_RATE
]) {
1149 /* NB: ignores errors from replace_estimator
1150 because change can't be undone. */
1151 if (sch
->flags
& TCQ_F_MQROOT
)
1153 gen_replace_estimator(&sch
->bstats
,
1157 qdisc_root_sleeping_running(sch
),
1164 struct check_loop_arg
{
1165 struct qdisc_walker w
;
1170 static int check_loop_fn(struct Qdisc
*q
, unsigned long cl
,
1171 struct qdisc_walker
*w
);
1173 static int check_loop(struct Qdisc
*q
, struct Qdisc
*p
, int depth
)
1175 struct check_loop_arg arg
;
1177 if (q
->ops
->cl_ops
== NULL
)
1180 arg
.w
.stop
= arg
.w
.skip
= arg
.w
.count
= 0;
1181 arg
.w
.fn
= check_loop_fn
;
1184 q
->ops
->cl_ops
->walk(q
, &arg
.w
);
1185 return arg
.w
.stop
? -ELOOP
: 0;
1189 check_loop_fn(struct Qdisc
*q
, unsigned long cl
, struct qdisc_walker
*w
)
1192 const struct Qdisc_class_ops
*cops
= q
->ops
->cl_ops
;
1193 struct check_loop_arg
*arg
= (struct check_loop_arg
*)w
;
1195 leaf
= cops
->leaf(q
, cl
);
1197 if (leaf
== arg
->p
|| arg
->depth
> 7)
1199 return check_loop(leaf
, arg
->p
, arg
->depth
+ 1);
1208 static int tc_get_qdisc(struct sk_buff
*skb
, struct nlmsghdr
*n
,
1209 struct netlink_ext_ack
*extack
)
1211 struct net
*net
= sock_net(skb
->sk
);
1212 struct tcmsg
*tcm
= nlmsg_data(n
);
1213 struct nlattr
*tca
[TCA_MAX
+ 1];
1214 struct net_device
*dev
;
1216 struct Qdisc
*q
= NULL
;
1217 struct Qdisc
*p
= NULL
;
1220 if ((n
->nlmsg_type
!= RTM_GETQDISC
) &&
1221 !netlink_ns_capable(skb
, net
->user_ns
, CAP_NET_ADMIN
))
1224 err
= nlmsg_parse(n
, sizeof(*tcm
), tca
, TCA_MAX
, NULL
, extack
);
1228 dev
= __dev_get_by_index(net
, tcm
->tcm_ifindex
);
1232 clid
= tcm
->tcm_parent
;
1234 if (clid
!= TC_H_ROOT
) {
1235 if (TC_H_MAJ(clid
) != TC_H_MAJ(TC_H_INGRESS
)) {
1236 p
= qdisc_lookup(dev
, TC_H_MAJ(clid
));
1239 q
= qdisc_leaf(p
, clid
);
1240 } else if (dev_ingress_queue(dev
)) {
1241 q
= dev_ingress_queue(dev
)->qdisc_sleeping
;
1249 if (tcm
->tcm_handle
&& q
->handle
!= tcm
->tcm_handle
)
1252 q
= qdisc_lookup(dev
, tcm
->tcm_handle
);
1257 if (tca
[TCA_KIND
] && nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))
1260 if (n
->nlmsg_type
== RTM_DELQDISC
) {
1265 err
= qdisc_graft(dev
, p
, skb
, n
, clid
, NULL
, q
);
1269 qdisc_notify(net
, skb
, n
, clid
, NULL
, q
);
1275 * Create/change qdisc.
1278 static int tc_modify_qdisc(struct sk_buff
*skb
, struct nlmsghdr
*n
,
1279 struct netlink_ext_ack
*extack
)
1281 struct net
*net
= sock_net(skb
->sk
);
1283 struct nlattr
*tca
[TCA_MAX
+ 1];
1284 struct net_device
*dev
;
1286 struct Qdisc
*q
, *p
;
1289 if (!netlink_ns_capable(skb
, net
->user_ns
, CAP_NET_ADMIN
))
1293 /* Reinit, just in case something touches this. */
1294 err
= nlmsg_parse(n
, sizeof(*tcm
), tca
, TCA_MAX
, NULL
, extack
);
1298 tcm
= nlmsg_data(n
);
1299 clid
= tcm
->tcm_parent
;
1302 dev
= __dev_get_by_index(net
, tcm
->tcm_ifindex
);
1308 if (clid
!= TC_H_ROOT
) {
1309 if (clid
!= TC_H_INGRESS
) {
1310 p
= qdisc_lookup(dev
, TC_H_MAJ(clid
));
1313 q
= qdisc_leaf(p
, clid
);
1314 } else if (dev_ingress_queue_create(dev
)) {
1315 q
= dev_ingress_queue(dev
)->qdisc_sleeping
;
1321 /* It may be default qdisc, ignore it */
1322 if (q
&& q
->handle
== 0)
1325 if (!q
|| !tcm
->tcm_handle
|| q
->handle
!= tcm
->tcm_handle
) {
1326 if (tcm
->tcm_handle
) {
1327 if (q
&& !(n
->nlmsg_flags
& NLM_F_REPLACE
))
1329 if (TC_H_MIN(tcm
->tcm_handle
))
1331 q
= qdisc_lookup(dev
, tcm
->tcm_handle
);
1333 goto create_n_graft
;
1334 if (n
->nlmsg_flags
& NLM_F_EXCL
)
1336 if (tca
[TCA_KIND
] && nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))
1339 (p
&& check_loop(q
, p
, 0)))
1341 qdisc_refcount_inc(q
);
1345 goto create_n_graft
;
1347 /* This magic test requires explanation.
1349 * We know, that some child q is already
1350 * attached to this parent and have choice:
1351 * either to change it or to create/graft new one.
1353 * 1. We are allowed to create/graft only
1354 * if CREATE and REPLACE flags are set.
1356 * 2. If EXCL is set, requestor wanted to say,
1357 * that qdisc tcm_handle is not expected
1358 * to exist, so that we choose create/graft too.
1360 * 3. The last case is when no flags are set.
1361 * Alas, it is sort of hole in API, we
1362 * cannot decide what to do unambiguously.
1363 * For now we select create/graft, if
1364 * user gave KIND, which does not match existing.
1366 if ((n
->nlmsg_flags
& NLM_F_CREATE
) &&
1367 (n
->nlmsg_flags
& NLM_F_REPLACE
) &&
1368 ((n
->nlmsg_flags
& NLM_F_EXCL
) ||
1370 nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))))
1371 goto create_n_graft
;
1375 if (!tcm
->tcm_handle
)
1377 q
= qdisc_lookup(dev
, tcm
->tcm_handle
);
1380 /* Change qdisc parameters */
1383 if (n
->nlmsg_flags
& NLM_F_EXCL
)
1385 if (tca
[TCA_KIND
] && nla_strcmp(tca
[TCA_KIND
], q
->ops
->id
))
1387 err
= qdisc_change(q
, tca
);
1389 qdisc_notify(net
, skb
, n
, clid
, NULL
, q
);
1393 if (!(n
->nlmsg_flags
& NLM_F_CREATE
))
1395 if (clid
== TC_H_INGRESS
) {
1396 if (dev_ingress_queue(dev
))
1397 q
= qdisc_create(dev
, dev_ingress_queue(dev
), p
,
1398 tcm
->tcm_parent
, tcm
->tcm_parent
,
1403 struct netdev_queue
*dev_queue
;
1405 if (p
&& p
->ops
->cl_ops
&& p
->ops
->cl_ops
->select_queue
)
1406 dev_queue
= p
->ops
->cl_ops
->select_queue(p
, tcm
);
1408 dev_queue
= p
->dev_queue
;
1410 dev_queue
= netdev_get_tx_queue(dev
, 0);
1412 q
= qdisc_create(dev
, dev_queue
, p
,
1413 tcm
->tcm_parent
, tcm
->tcm_handle
,
1423 err
= qdisc_graft(dev
, p
, skb
, n
, clid
, q
, NULL
);
1433 static int tc_dump_qdisc_root(struct Qdisc
*root
, struct sk_buff
*skb
,
1434 struct netlink_callback
*cb
,
1435 int *q_idx_p
, int s_q_idx
, bool recur
,
1436 bool dump_invisible
)
1438 int ret
= 0, q_idx
= *q_idx_p
;
1446 if (q_idx
< s_q_idx
) {
1449 if (!tc_qdisc_dump_ignore(q
, dump_invisible
) &&
1450 tc_fill_qdisc(skb
, q
, q
->parent
, NETLINK_CB(cb
->skb
).portid
,
1451 cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
,
1457 /* If dumping singletons, there is no qdisc_dev(root) and the singleton
1458 * itself has already been dumped.
1460 * If we've already dumped the top-level (ingress) qdisc above and the global
1461 * qdisc hashtable, we don't want to hit it again
1463 if (!qdisc_dev(root
) || !recur
)
1466 hash_for_each(qdisc_dev(root
)->qdisc_hash
, b
, q
, hash
) {
1467 if (q_idx
< s_q_idx
) {
1471 if (!tc_qdisc_dump_ignore(q
, dump_invisible
) &&
1472 tc_fill_qdisc(skb
, q
, q
->parent
, NETLINK_CB(cb
->skb
).portid
,
1473 cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
,
1487 static int tc_dump_qdisc(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1489 struct net
*net
= sock_net(skb
->sk
);
1492 struct net_device
*dev
;
1493 const struct nlmsghdr
*nlh
= cb
->nlh
;
1494 struct nlattr
*tca
[TCA_MAX
+ 1];
1497 s_idx
= cb
->args
[0];
1498 s_q_idx
= q_idx
= cb
->args
[1];
1503 err
= nlmsg_parse(nlh
, sizeof(struct tcmsg
), tca
, TCA_MAX
, NULL
, NULL
);
1507 for_each_netdev(net
, dev
) {
1508 struct netdev_queue
*dev_queue
;
1516 if (tc_dump_qdisc_root(dev
->qdisc
, skb
, cb
, &q_idx
, s_q_idx
,
1517 true, tca
[TCA_DUMP_INVISIBLE
]) < 0)
1520 dev_queue
= dev_ingress_queue(dev
);
1522 tc_dump_qdisc_root(dev_queue
->qdisc_sleeping
, skb
, cb
,
1523 &q_idx
, s_q_idx
, false,
1524 tca
[TCA_DUMP_INVISIBLE
]) < 0)
1533 cb
->args
[1] = q_idx
;
1540 /************************************************
1541 * Traffic classes manipulation. *
1542 ************************************************/
1544 static int tc_fill_tclass(struct sk_buff
*skb
, struct Qdisc
*q
,
1546 u32 portid
, u32 seq
, u16 flags
, int event
)
1549 struct nlmsghdr
*nlh
;
1550 unsigned char *b
= skb_tail_pointer(skb
);
1552 const struct Qdisc_class_ops
*cl_ops
= q
->ops
->cl_ops
;
1555 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*tcm
), flags
);
1557 goto out_nlmsg_trim
;
1558 tcm
= nlmsg_data(nlh
);
1559 tcm
->tcm_family
= AF_UNSPEC
;
1562 tcm
->tcm_ifindex
= qdisc_dev(q
)->ifindex
;
1563 tcm
->tcm_parent
= q
->handle
;
1564 tcm
->tcm_handle
= q
->handle
;
1566 if (nla_put_string(skb
, TCA_KIND
, q
->ops
->id
))
1567 goto nla_put_failure
;
1568 if (cl_ops
->dump
&& cl_ops
->dump(q
, cl
, skb
, tcm
) < 0)
1569 goto nla_put_failure
;
1571 if (gnet_stats_start_copy_compat(skb
, TCA_STATS2
, TCA_STATS
, TCA_XSTATS
,
1572 NULL
, &d
, TCA_PAD
) < 0)
1573 goto nla_put_failure
;
1575 if (cl_ops
->dump_stats
&& cl_ops
->dump_stats(q
, cl
, &d
) < 0)
1576 goto nla_put_failure
;
1578 if (gnet_stats_finish_copy(&d
) < 0)
1579 goto nla_put_failure
;
1581 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
1590 static int tclass_notify(struct net
*net
, struct sk_buff
*oskb
,
1591 struct nlmsghdr
*n
, struct Qdisc
*q
,
1592 unsigned long cl
, int event
)
1594 struct sk_buff
*skb
;
1595 u32 portid
= oskb
? NETLINK_CB(oskb
).portid
: 0;
1597 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1601 if (tc_fill_tclass(skb
, q
, cl
, portid
, n
->nlmsg_seq
, 0, event
) < 0) {
1606 return rtnetlink_send(skb
, net
, portid
, RTNLGRP_TC
,
1607 n
->nlmsg_flags
& NLM_F_ECHO
);
1610 static int tclass_del_notify(struct net
*net
,
1611 const struct Qdisc_class_ops
*cops
,
1612 struct sk_buff
*oskb
, struct nlmsghdr
*n
,
1613 struct Qdisc
*q
, unsigned long cl
)
1615 u32 portid
= oskb
? NETLINK_CB(oskb
).portid
: 0;
1616 struct sk_buff
*skb
;
1622 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1626 if (tc_fill_tclass(skb
, q
, cl
, portid
, n
->nlmsg_seq
, 0,
1627 RTM_DELTCLASS
) < 0) {
1632 err
= cops
->delete(q
, cl
);
1638 return rtnetlink_send(skb
, net
, portid
, RTNLGRP_TC
,
1639 n
->nlmsg_flags
& NLM_F_ECHO
);
1642 #ifdef CONFIG_NET_CLS
1644 struct tcf_bind_args
{
1645 struct tcf_walker w
;
1650 static int tcf_node_bind(struct tcf_proto
*tp
, void *n
, struct tcf_walker
*arg
)
1652 struct tcf_bind_args
*a
= (void *)arg
;
1654 if (tp
->ops
->bind_class
) {
1655 struct Qdisc
*q
= tcf_block_q(tp
->chain
->block
);
1658 tp
->ops
->bind_class(n
, a
->classid
, a
->cl
);
1664 static void tc_bind_tclass(struct Qdisc
*q
, u32 portid
, u32 clid
,
1665 unsigned long new_cl
)
1667 const struct Qdisc_class_ops
*cops
= q
->ops
->cl_ops
;
1668 struct tcf_block
*block
;
1669 struct tcf_chain
*chain
;
1672 cl
= cops
->find(q
, portid
);
1675 block
= cops
->tcf_block(q
, cl
);
1678 list_for_each_entry(chain
, &block
->chain_list
, list
) {
1679 struct tcf_proto
*tp
;
1681 for (tp
= rtnl_dereference(chain
->filter_chain
);
1682 tp
; tp
= rtnl_dereference(tp
->next
)) {
1683 struct tcf_bind_args arg
= {};
1685 arg
.w
.fn
= tcf_node_bind
;
1688 tp
->ops
->walk(tp
, &arg
.w
);
1695 static void tc_bind_tclass(struct Qdisc
*q
, u32 portid
, u32 clid
,
1696 unsigned long new_cl
)
1702 static int tc_ctl_tclass(struct sk_buff
*skb
, struct nlmsghdr
*n
,
1703 struct netlink_ext_ack
*extack
)
1705 struct net
*net
= sock_net(skb
->sk
);
1706 struct tcmsg
*tcm
= nlmsg_data(n
);
1707 struct nlattr
*tca
[TCA_MAX
+ 1];
1708 struct net_device
*dev
;
1709 struct Qdisc
*q
= NULL
;
1710 const struct Qdisc_class_ops
*cops
;
1711 unsigned long cl
= 0;
1712 unsigned long new_cl
;
1718 if ((n
->nlmsg_type
!= RTM_GETTCLASS
) &&
1719 !netlink_ns_capable(skb
, net
->user_ns
, CAP_NET_ADMIN
))
1722 err
= nlmsg_parse(n
, sizeof(*tcm
), tca
, TCA_MAX
, NULL
, extack
);
1726 dev
= __dev_get_by_index(net
, tcm
->tcm_ifindex
);
1731 parent == TC_H_UNSPEC - unspecified parent.
1732 parent == TC_H_ROOT - class is root, which has no parent.
1733 parent == X:0 - parent is root class.
1734 parent == X:Y - parent is a node in hierarchy.
1735 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1737 handle == 0:0 - generate handle from kernel pool.
1738 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1739 handle == X:Y - clear.
1740 handle == X:0 - root class.
1743 /* Step 1. Determine qdisc handle X:0 */
1745 portid
= tcm
->tcm_parent
;
1746 clid
= tcm
->tcm_handle
;
1747 qid
= TC_H_MAJ(clid
);
1749 if (portid
!= TC_H_ROOT
) {
1750 u32 qid1
= TC_H_MAJ(portid
);
1753 /* If both majors are known, they must be identical. */
1758 } else if (qid
== 0)
1759 qid
= dev
->qdisc
->handle
;
1761 /* Now qid is genuine qdisc handle consistent
1762 * both with parent and child.
1764 * TC_H_MAJ(portid) still may be unspecified, complete it now.
1767 portid
= TC_H_MAKE(qid
, portid
);
1770 qid
= dev
->qdisc
->handle
;
1773 /* OK. Locate qdisc */
1774 q
= qdisc_lookup(dev
, qid
);
1778 /* An check that it supports classes */
1779 cops
= q
->ops
->cl_ops
;
1783 /* Now try to get class */
1785 if (portid
== TC_H_ROOT
)
1788 clid
= TC_H_MAKE(qid
, clid
);
1791 cl
= cops
->find(q
, clid
);
1795 if (n
->nlmsg_type
!= RTM_NEWTCLASS
||
1796 !(n
->nlmsg_flags
& NLM_F_CREATE
))
1799 switch (n
->nlmsg_type
) {
1802 if (n
->nlmsg_flags
& NLM_F_EXCL
)
1806 err
= tclass_del_notify(net
, cops
, skb
, n
, q
, cl
);
1807 /* Unbind the class with flilters with 0 */
1808 tc_bind_tclass(q
, portid
, clid
, 0);
1811 err
= tclass_notify(net
, skb
, n
, q
, cl
, RTM_NEWTCLASS
);
1822 err
= cops
->change(q
, clid
, portid
, tca
, &new_cl
);
1824 tclass_notify(net
, skb
, n
, q
, new_cl
, RTM_NEWTCLASS
);
1825 /* We just create a new class, need to do reverse binding. */
1827 tc_bind_tclass(q
, portid
, clid
, new_cl
);
1833 struct qdisc_dump_args
{
1834 struct qdisc_walker w
;
1835 struct sk_buff
*skb
;
1836 struct netlink_callback
*cb
;
1839 static int qdisc_class_dump(struct Qdisc
*q
, unsigned long cl
,
1840 struct qdisc_walker
*arg
)
1842 struct qdisc_dump_args
*a
= (struct qdisc_dump_args
*)arg
;
1844 return tc_fill_tclass(a
->skb
, q
, cl
, NETLINK_CB(a
->cb
->skb
).portid
,
1845 a
->cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
,
1849 static int tc_dump_tclass_qdisc(struct Qdisc
*q
, struct sk_buff
*skb
,
1850 struct tcmsg
*tcm
, struct netlink_callback
*cb
,
1853 struct qdisc_dump_args arg
;
1855 if (tc_qdisc_dump_ignore(q
, false) ||
1856 *t_p
< s_t
|| !q
->ops
->cl_ops
||
1858 TC_H_MAJ(tcm
->tcm_parent
) != q
->handle
)) {
1863 memset(&cb
->args
[1], 0, sizeof(cb
->args
)-sizeof(cb
->args
[0]));
1864 arg
.w
.fn
= qdisc_class_dump
;
1868 arg
.w
.skip
= cb
->args
[1];
1870 q
->ops
->cl_ops
->walk(q
, &arg
.w
);
1871 cb
->args
[1] = arg
.w
.count
;
1878 static int tc_dump_tclass_root(struct Qdisc
*root
, struct sk_buff
*skb
,
1879 struct tcmsg
*tcm
, struct netlink_callback
*cb
,
1888 if (tc_dump_tclass_qdisc(root
, skb
, tcm
, cb
, t_p
, s_t
) < 0)
1891 if (!qdisc_dev(root
))
1894 if (tcm
->tcm_parent
) {
1895 q
= qdisc_match_from_root(root
, TC_H_MAJ(tcm
->tcm_parent
));
1896 if (q
&& tc_dump_tclass_qdisc(q
, skb
, tcm
, cb
, t_p
, s_t
) < 0)
1900 hash_for_each(qdisc_dev(root
)->qdisc_hash
, b
, q
, hash
) {
1901 if (tc_dump_tclass_qdisc(q
, skb
, tcm
, cb
, t_p
, s_t
) < 0)
1908 static int tc_dump_tclass(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1910 struct tcmsg
*tcm
= nlmsg_data(cb
->nlh
);
1911 struct net
*net
= sock_net(skb
->sk
);
1912 struct netdev_queue
*dev_queue
;
1913 struct net_device
*dev
;
1916 if (nlmsg_len(cb
->nlh
) < sizeof(*tcm
))
1918 dev
= dev_get_by_index(net
, tcm
->tcm_ifindex
);
1925 if (tc_dump_tclass_root(dev
->qdisc
, skb
, tcm
, cb
, &t
, s_t
) < 0)
1928 dev_queue
= dev_ingress_queue(dev
);
1930 tc_dump_tclass_root(dev_queue
->qdisc_sleeping
, skb
, tcm
, cb
,
1941 #ifdef CONFIG_PROC_FS
1942 static int psched_show(struct seq_file
*seq
, void *v
)
1944 seq_printf(seq
, "%08x %08x %08x %08x\n",
1945 (u32
)NSEC_PER_USEC
, (u32
)PSCHED_TICKS2NS(1),
1947 (u32
)NSEC_PER_SEC
/ hrtimer_resolution
);
1952 static int psched_open(struct inode
*inode
, struct file
*file
)
1954 return single_open(file
, psched_show
, NULL
);
1957 static const struct file_operations psched_fops
= {
1958 .owner
= THIS_MODULE
,
1959 .open
= psched_open
,
1961 .llseek
= seq_lseek
,
1962 .release
= single_release
,
1965 static int __net_init
psched_net_init(struct net
*net
)
1967 struct proc_dir_entry
*e
;
1969 e
= proc_create("psched", 0, net
->proc_net
, &psched_fops
);
1976 static void __net_exit
psched_net_exit(struct net
*net
)
1978 remove_proc_entry("psched", net
->proc_net
);
1981 static int __net_init
psched_net_init(struct net
*net
)
1986 static void __net_exit
psched_net_exit(struct net
*net
)
1991 static struct pernet_operations psched_net_ops
= {
1992 .init
= psched_net_init
,
1993 .exit
= psched_net_exit
,
1996 static int __init
pktsched_init(void)
2000 err
= register_pernet_subsys(&psched_net_ops
);
2002 pr_err("pktsched_init: "
2003 "cannot initialize per netns operations\n");
2007 register_qdisc(&pfifo_fast_ops
);
2008 register_qdisc(&pfifo_qdisc_ops
);
2009 register_qdisc(&bfifo_qdisc_ops
);
2010 register_qdisc(&pfifo_head_drop_qdisc_ops
);
2011 register_qdisc(&mq_qdisc_ops
);
2012 register_qdisc(&noqueue_qdisc_ops
);
2014 rtnl_register(PF_UNSPEC
, RTM_NEWQDISC
, tc_modify_qdisc
, NULL
, 0);
2015 rtnl_register(PF_UNSPEC
, RTM_DELQDISC
, tc_get_qdisc
, NULL
, 0);
2016 rtnl_register(PF_UNSPEC
, RTM_GETQDISC
, tc_get_qdisc
, tc_dump_qdisc
,
2018 rtnl_register(PF_UNSPEC
, RTM_NEWTCLASS
, tc_ctl_tclass
, NULL
, 0);
2019 rtnl_register(PF_UNSPEC
, RTM_DELTCLASS
, tc_ctl_tclass
, NULL
, 0);
2020 rtnl_register(PF_UNSPEC
, RTM_GETTCLASS
, tc_ctl_tclass
, tc_dump_tclass
,
2026 subsys_initcall(pktsched_init
);