New: mac80211 stack from the wireless-dev tree
[openwrt/openwrt.git] / package / mac80211 / src / mac80211 / wme.c
1 /*
2 * Copyright 2004, Instant802 Networks, Inc.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9 #include <linux/netdevice.h>
10 #include <linux/skbuff.h>
11 #include <linux/module.h>
12 #include <linux/if_arp.h>
13 #include <linux/types.h>
14 #include <net/ip.h>
15 #include <net/pkt_sched.h>
16
17 #include <net/mac80211.h>
18 #include "ieee80211_i.h"
19 #include "wme.h"
20
21 static inline int WLAN_FC_IS_QOS_DATA(u16 fc)
22 {
23 return (fc & 0x8C) == 0x88;
24 }
25
26
27 ieee80211_txrx_result
28 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
29 {
30 u8 *data = rx->skb->data;
31 int tid;
32 unsigned int is_agg_frame = 0;
33
34 /* does the frame have a qos control field? */
35 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
36 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
37
38 /* frame has qos control */
39 rx->u.rx.qos_control = le16_to_cpu(*((__le16*)qc));
40 tid = rx->u.rx.qos_control & QOS_CONTROL_TID_MASK;
41 if (rx->u.rx.qos_control &
42 IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
43 is_agg_frame = 1;
44 } else {
45 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
46 /* Separate TID for management frames */
47 tid = NUM_RX_DATA_QUEUES - 1;
48 } else {
49 /* no qos control present */
50 tid = 0; /* 802.1d - Best Effort */
51 }
52 rx->u.rx.qos_control = 0;
53 }
54 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
55 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
56 if (rx->sta) {
57 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
58 }
59 #endif /* CONFIG_MAC80211_DEBUG_COUNTERS */
60
61 rx->u.rx.queue = tid;
62 rx->u.rx.is_agg_frame = is_agg_frame;
63 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
64 * For now, set skb->priority to 0 for other cases. */
65 rx->skb->priority = (tid > 7) ? 0 : tid;
66
67 return TXRX_CONTINUE;
68 }
69
70
71 ieee80211_txrx_result
72 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
73 {
74 u16 fc = rx->fc;
75 u8 *data = rx->skb->data;
76 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
77
78 if (!WLAN_FC_IS_QOS_DATA(fc))
79 return TXRX_CONTINUE;
80
81 /* remove the qos control field, update frame type and meta-data */
82 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
83 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
84 /* change frame type to non QOS */
85 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
86 hdr->frame_control = cpu_to_le16(fc);
87
88 return TXRX_CONTINUE;
89 }
90
91
92 #ifdef CONFIG_NET_SCHED
93 /* maximum number of hardware queues we support. */
94 #define TC_80211_MAX_QUEUES 8
95
96 struct ieee80211_sched_data
97 {
98 struct tcf_proto *filter_list;
99 struct Qdisc *queues[TC_80211_MAX_QUEUES];
100 struct sk_buff_head requeued[TC_80211_MAX_QUEUES];
101 };
102
103
104 /* given a data frame determine the 802.1p/1d tag to use */
105 static inline unsigned classify_1d(struct sk_buff *skb, struct Qdisc *qd)
106 {
107 struct iphdr *ip;
108 int dscp;
109 int offset;
110
111 struct ieee80211_sched_data *q = qdisc_priv(qd);
112 struct tcf_result res = { -1, 0 };
113
114 /* if there is a user set filter list, call out to that */
115 if (q->filter_list) {
116 tc_classify(skb, q->filter_list, &res);
117 if (res.class != -1)
118 return res.class;
119 }
120
121 /* skb->priority values from 256->263 are magic values to
122 * directly indicate a specific 802.1d priority.
123 * This is used to allow 802.1d priority to be passed directly in
124 * from VLAN tags, etc. */
125 if (skb->priority >= 256 && skb->priority <= 263)
126 return skb->priority - 256;
127
128 /* check there is a valid IP header present */
129 offset = ieee80211_get_hdrlen_from_skb(skb) + 8 /* LLC + proto */;
130 if (skb->protocol != __constant_htons(ETH_P_IP) ||
131 skb->len < offset + sizeof(*ip))
132 return 0;
133
134 ip = (struct iphdr *) (skb->data + offset);
135
136 dscp = ip->tos & 0xfc;
137 if (dscp & 0x1c)
138 return 0;
139 return dscp >> 5;
140 }
141
142
143 static inline int wme_downgrade_ac(struct sk_buff *skb)
144 {
145 switch (skb->priority) {
146 case 6:
147 case 7:
148 skb->priority = 5; /* VO -> VI */
149 return 0;
150 case 4:
151 case 5:
152 skb->priority = 3; /* VI -> BE */
153 return 0;
154 case 0:
155 case 3:
156 skb->priority = 2; /* BE -> BK */
157 return 0;
158 default:
159 return -1;
160 }
161 }
162
163
164 /* positive return value indicates which queue to use
165 * negative return value indicates to drop the frame */
166 static inline int classify80211(struct sk_buff *skb, struct Qdisc *qd)
167 {
168 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
169 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(qd->dev);
170 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
171 struct ieee80211_tx_packet_data *pkt_data =
172 (struct ieee80211_tx_packet_data *) skb->cb;
173 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
174 unsigned short fc = le16_to_cpu(hdr->frame_control);
175 int qos, tsid, dir;
176 const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
177
178 /* see if frame is data or non data frame */
179 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) {
180 /* management frames go on AC_VO queue, but are sent
181 * without QoS control fields */
182 return IEEE80211_TX_QUEUE_DATA0;
183 }
184
185 if (unlikely(pkt_data->mgmt_iface)) {
186 /* Data frames from hostapd (mainly, EAPOL) use AC_VO
187 * and they will include QoS control fields if
188 * the target STA is using WME. */
189 skb->priority = 7;
190 return ieee802_1d_to_ac[skb->priority];
191 }
192
193 /* is this a QoS frame? */
194 qos = fc & IEEE80211_STYPE_QOS_DATA;
195
196 if (!qos) {
197 skb->priority = 0; /* required for correct WPA/11i MIC */
198 return ieee802_1d_to_ac[skb->priority];
199 }
200
201 /* use the data classifier to determine what 802.1d tag the
202 * data frame has */
203 skb->priority = classify_1d(skb, qd);
204 tsid = 8 + skb->priority;
205
206 /* FIXME: only uplink needs to be checked for Tx */
207 dir = STA_TS_UPLINK;
208
209 if ((sdata->type == IEEE80211_IF_TYPE_STA) &&
210 (local->wmm_acm & BIT(skb->priority))) {
211 switch (ifsta->ts_data[tsid][dir].status) {
212 case TS_STATUS_ACTIVE:
213 /* if TS Management is enabled, update used_time */
214 ifsta->ts_data[tsid][dir].used_time_usec +=
215 ifsta->MPDUExchangeTime;
216 break;
217 case TS_STATUS_THROTTLING:
218 /* if admitted time is used up, refuse to send more */
219 if (net_ratelimit())
220 printk(KERN_DEBUG "QoS packet throttling\n");
221 break;
222 default:
223 break;
224 }
225 }
226
227 /* in case we are a client verify acm is not set for this ac */
228 while ((local->wmm_acm & BIT(skb->priority)) &&
229 !((sdata->type == IEEE80211_IF_TYPE_STA) &&
230 (ifsta->ts_data[skb->priority + EDCA_TSID_MIN][dir].status
231 == TS_STATUS_ACTIVE))) {
232 if (wme_downgrade_ac(skb)) {
233 /* No AC with lower priority has acm=0, drop packet. */
234 return -1;
235 }
236 }
237
238 /* look up which queue to use for frames with this 1d tag */
239 return ieee802_1d_to_ac[skb->priority];
240 }
241
242
243 static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
244 {
245 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
246 struct ieee80211_sched_data *q = qdisc_priv(qd);
247 struct ieee80211_tx_packet_data *pkt_data =
248 (struct ieee80211_tx_packet_data *) skb->cb;
249 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
250 unsigned short fc = le16_to_cpu(hdr->frame_control);
251 struct Qdisc *qdisc;
252 int err, queue;
253
254 if (pkt_data->requeue) {
255 skb_queue_tail(&q->requeued[pkt_data->queue], skb);
256 qd->q.qlen++;
257 return 0;
258 }
259
260 queue = classify80211(skb, qd);
261
262 /* now we know the 1d priority, fill in the QoS header if there is one
263 */
264 if (WLAN_FC_IS_QOS_DATA(fc)) {
265 u8 *p = skb->data + ieee80211_get_hdrlen(fc) - 2;
266 u8 qos_hdr = skb->priority & QOS_CONTROL_TAG1D_MASK;
267 if (local->wifi_wme_noack_test)
268 qos_hdr |= QOS_CONTROL_ACK_POLICY_NOACK <<
269 QOS_CONTROL_ACK_POLICY_SHIFT;
270 /* qos header is 2 bytes, second reserved */
271 *p = qos_hdr;
272 p++;
273 *p = 0;
274 }
275
276 if (unlikely(queue >= local->hw.queues)) {
277 #if 0
278 if (net_ratelimit()) {
279 printk(KERN_DEBUG "%s - queue=%d (hw does not "
280 "support) -> %d\n",
281 __func__, queue, local->hw.queues - 1);
282 }
283 #endif
284 queue = local->hw.queues - 1;
285 }
286
287 if (unlikely(queue < 0)) {
288 kfree_skb(skb);
289 err = NET_XMIT_DROP;
290 } else {
291 pkt_data->queue = (unsigned int) queue;
292 qdisc = q->queues[queue];
293 err = qdisc->enqueue(skb, qdisc);
294 if (err == NET_XMIT_SUCCESS) {
295 qd->q.qlen++;
296 qd->bstats.bytes += skb->len;
297 qd->bstats.packets++;
298 return NET_XMIT_SUCCESS;
299 }
300 }
301 qd->qstats.drops++;
302 return err;
303 }
304
305
306 /* TODO: clean up the cases where master_hard_start_xmit
307 * returns non 0 - it shouldn't ever do that. Once done we
308 * can remove this function */
309 static int wme_qdiscop_requeue(struct sk_buff *skb, struct Qdisc* qd)
310 {
311 struct ieee80211_sched_data *q = qdisc_priv(qd);
312 struct ieee80211_tx_packet_data *pkt_data =
313 (struct ieee80211_tx_packet_data *) skb->cb;
314 struct Qdisc *qdisc;
315 int err;
316
317 /* we recorded which queue to use earlier! */
318 qdisc = q->queues[pkt_data->queue];
319
320 if ((err = qdisc->ops->requeue(skb, qdisc)) == 0) {
321 qd->q.qlen++;
322 return 0;
323 }
324 qd->qstats.drops++;
325 return err;
326 }
327
328
329 static struct sk_buff *wme_qdiscop_dequeue(struct Qdisc* qd)
330 {
331 struct ieee80211_sched_data *q = qdisc_priv(qd);
332 struct net_device *dev = qd->dev;
333 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
334 struct ieee80211_hw *hw = &local->hw;
335 struct sk_buff *skb;
336 struct Qdisc *qdisc;
337 int queue;
338
339 /* check all the h/w queues in numeric/priority order */
340 for (queue = 0; queue < hw->queues; queue++) {
341 /* see if there is room in this hardware queue */
342 if (test_bit(IEEE80211_LINK_STATE_XOFF,
343 &local->state[queue]) ||
344 test_bit(IEEE80211_LINK_STATE_PENDING,
345 &local->state[queue]))
346 continue;
347
348 /* there is space - try and get a frame */
349 skb = skb_dequeue(&q->requeued[queue]);
350 if (skb) {
351 qd->q.qlen--;
352 return skb;
353 }
354
355 qdisc = q->queues[queue];
356 skb = qdisc->dequeue(qdisc);
357 if (skb) {
358 qd->q.qlen--;
359 return skb;
360 }
361 }
362 /* returning a NULL here when all the h/w queues are full means we
363 * never need to call netif_stop_queue in the driver */
364 return NULL;
365 }
366
367
368 static void wme_qdiscop_reset(struct Qdisc* qd)
369 {
370 struct ieee80211_sched_data *q = qdisc_priv(qd);
371 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
372 struct ieee80211_hw *hw = &local->hw;
373 int queue;
374
375 /* QUESTION: should we have some hardware flush functionality here? */
376
377 for (queue = 0; queue < hw->queues; queue++) {
378 skb_queue_purge(&q->requeued[queue]);
379 qdisc_reset(q->queues[queue]);
380 }
381 qd->q.qlen = 0;
382 }
383
384
385 static void wme_qdiscop_destroy(struct Qdisc* qd)
386 {
387 struct ieee80211_sched_data *q = qdisc_priv(qd);
388 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
389 struct ieee80211_hw *hw = &local->hw;
390 int queue;
391
392 tcf_destroy_chain(q->filter_list);
393 q->filter_list = NULL;
394
395 for (queue=0; queue < hw->queues; queue++) {
396 skb_queue_purge(&q->requeued[queue]);
397 qdisc_destroy(q->queues[queue]);
398 q->queues[queue] = &noop_qdisc;
399 }
400 }
401
402
403 /* called whenever parameters are updated on existing qdisc */
404 static int wme_qdiscop_tune(struct Qdisc *qd, struct rtattr *opt)
405 {
406 /* struct ieee80211_sched_data *q = qdisc_priv(qd);
407 */
408 /* check our options block is the right size */
409 /* copy any options to our local structure */
410 /* Ignore options block for now - always use static mapping
411 struct tc_ieee80211_qopt *qopt = RTA_DATA(opt);
412
413 if (opt->rta_len < RTA_LENGTH(sizeof(*qopt)))
414 return -EINVAL;
415 memcpy(q->tag2queue, qopt->tag2queue, sizeof(qopt->tag2queue));
416 */
417 return 0;
418 }
419
420
421 /* called during initial creation of qdisc on device */
422 static int wme_qdiscop_init(struct Qdisc *qd, struct rtattr *opt)
423 {
424 struct ieee80211_sched_data *q = qdisc_priv(qd);
425 struct net_device *dev = qd->dev;
426 struct ieee80211_local *local;
427 int queues;
428 int err = 0, i;
429
430 /* check that device is a mac80211 device */
431 if (!dev->ieee80211_ptr ||
432 dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
433 return -EINVAL;
434
435 /* check this device is an ieee80211 master type device */
436 if (dev->type != ARPHRD_IEEE80211)
437 return -EINVAL;
438
439 /* check that there is no qdisc currently attached to device
440 * this ensures that we will be the root qdisc. (I can't find a better
441 * way to test this explicitly) */
442 if (dev->qdisc_sleeping != &noop_qdisc)
443 return -EINVAL;
444
445 if (qd->flags & TCQ_F_INGRESS)
446 return -EINVAL;
447
448 local = wdev_priv(dev->ieee80211_ptr);
449 queues = local->hw.queues;
450
451 /* if options were passed in, set them */
452 if (opt) {
453 err = wme_qdiscop_tune(qd, opt);
454 }
455
456 /* create child queues */
457 for (i = 0; i < queues; i++) {
458 skb_queue_head_init(&q->requeued[i]);
459 q->queues[i] = qdisc_create_dflt(qd->dev, &pfifo_qdisc_ops,
460 qd->handle);
461 if (q->queues[i] == 0) {
462 q->queues[i] = &noop_qdisc;
463 printk(KERN_ERR "%s child qdisc %i creation failed", dev->name, i);
464 }
465 }
466
467 return err;
468 }
469
470 static int wme_qdiscop_dump(struct Qdisc *qd, struct sk_buff *skb)
471 {
472 /* struct ieee80211_sched_data *q = qdisc_priv(qd);
473 unsigned char *p = skb->tail;
474 struct tc_ieee80211_qopt opt;
475
476 memcpy(&opt.tag2queue, q->tag2queue, TC_80211_MAX_TAG + 1);
477 RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
478 */ return skb->len;
479 /*
480 rtattr_failure:
481 skb_trim(skb, p - skb->data);*/
482 return -1;
483 }
484
485
486 static int wme_classop_graft(struct Qdisc *qd, unsigned long arg,
487 struct Qdisc *new, struct Qdisc **old)
488 {
489 struct ieee80211_sched_data *q = qdisc_priv(qd);
490 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
491 struct ieee80211_hw *hw = &local->hw;
492 unsigned long queue = arg - 1;
493
494 if (queue >= hw->queues)
495 return -EINVAL;
496
497 if (!new)
498 new = &noop_qdisc;
499
500 sch_tree_lock(qd);
501 *old = q->queues[queue];
502 q->queues[queue] = new;
503 qdisc_reset(*old);
504 sch_tree_unlock(qd);
505
506 return 0;
507 }
508
509
510 static struct Qdisc *
511 wme_classop_leaf(struct Qdisc *qd, unsigned long arg)
512 {
513 struct ieee80211_sched_data *q = qdisc_priv(qd);
514 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
515 struct ieee80211_hw *hw = &local->hw;
516 unsigned long queue = arg - 1;
517
518 if (queue >= hw->queues)
519 return NULL;
520
521 return q->queues[queue];
522 }
523
524
525 static unsigned long wme_classop_get(struct Qdisc *qd, u32 classid)
526 {
527 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
528 struct ieee80211_hw *hw = &local->hw;
529 unsigned long queue = TC_H_MIN(classid);
530
531 if (queue - 1 >= hw->queues)
532 return 0;
533
534 return queue;
535 }
536
537
538 static unsigned long wme_classop_bind(struct Qdisc *qd, unsigned long parent,
539 u32 classid)
540 {
541 return wme_classop_get(qd, classid);
542 }
543
544
545 static void wme_classop_put(struct Qdisc *q, unsigned long cl)
546 {
547 }
548
549
550 static int wme_classop_change(struct Qdisc *qd, u32 handle, u32 parent,
551 struct rtattr **tca, unsigned long *arg)
552 {
553 unsigned long cl = *arg;
554 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
555 struct ieee80211_hw *hw = &local->hw;
556
557 if (cl - 1 > hw->queues)
558 return -ENOENT;
559
560 /* TODO: put code to program hardware queue parameters here,
561 * to allow programming from tc command line */
562
563 return 0;
564 }
565
566
567 /* we don't support deleting hardware queues
568 * when we add WMM-SA support - TSPECs may be deleted here */
569 static int wme_classop_delete(struct Qdisc *qd, unsigned long cl)
570 {
571 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
572 struct ieee80211_hw *hw = &local->hw;
573
574 if (cl - 1 > hw->queues)
575 return -ENOENT;
576 return 0;
577 }
578
579
580 static int wme_classop_dump_class(struct Qdisc *qd, unsigned long cl,
581 struct sk_buff *skb, struct tcmsg *tcm)
582 {
583 struct ieee80211_sched_data *q = qdisc_priv(qd);
584 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
585 struct ieee80211_hw *hw = &local->hw;
586
587 if (cl - 1 > hw->queues)
588 return -ENOENT;
589 tcm->tcm_handle = TC_H_MIN(cl);
590 tcm->tcm_parent = qd->handle;
591 tcm->tcm_info = q->queues[cl-1]->handle; /* do we need this? */
592 return 0;
593 }
594
595
596 static void wme_classop_walk(struct Qdisc *qd, struct qdisc_walker *arg)
597 {
598 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
599 struct ieee80211_hw *hw = &local->hw;
600 int queue;
601
602 if (arg->stop)
603 return;
604
605 for (queue = 0; queue < hw->queues; queue++) {
606 if (arg->count < arg->skip) {
607 arg->count++;
608 continue;
609 }
610 /* we should return classids for our internal queues here
611 * as well as the external ones */
612 if (arg->fn(qd, queue+1, arg) < 0) {
613 arg->stop = 1;
614 break;
615 }
616 arg->count++;
617 }
618 }
619
620
621 static struct tcf_proto ** wme_classop_find_tcf(struct Qdisc *qd,
622 unsigned long cl)
623 {
624 struct ieee80211_sched_data *q = qdisc_priv(qd);
625
626 if (cl)
627 return NULL;
628
629 return &q->filter_list;
630 }
631
632
633 /* this qdisc is classful (i.e. has classes, some of which may have leaf qdiscs attached)
634 * - these are the operations on the classes */
635 static struct Qdisc_class_ops class_ops =
636 {
637 .graft = wme_classop_graft,
638 .leaf = wme_classop_leaf,
639
640 .get = wme_classop_get,
641 .put = wme_classop_put,
642 .change = wme_classop_change,
643 .delete = wme_classop_delete,
644 .walk = wme_classop_walk,
645
646 .tcf_chain = wme_classop_find_tcf,
647 .bind_tcf = wme_classop_bind,
648 .unbind_tcf = wme_classop_put,
649
650 .dump = wme_classop_dump_class,
651 };
652
653
654 /* queueing discipline operations */
655 static struct Qdisc_ops wme_qdisc_ops =
656 {
657 .next = NULL,
658 .cl_ops = &class_ops,
659 .id = "ieee80211",
660 .priv_size = sizeof(struct ieee80211_sched_data),
661
662 .enqueue = wme_qdiscop_enqueue,
663 .dequeue = wme_qdiscop_dequeue,
664 .requeue = wme_qdiscop_requeue,
665 .drop = NULL, /* drop not needed since we are always the root qdisc */
666
667 .init = wme_qdiscop_init,
668 .reset = wme_qdiscop_reset,
669 .destroy = wme_qdiscop_destroy,
670 .change = wme_qdiscop_tune,
671
672 .dump = wme_qdiscop_dump,
673 };
674
675
676 void ieee80211_install_qdisc(struct net_device *dev)
677 {
678 struct Qdisc *qdisc;
679
680 qdisc = qdisc_create_dflt(dev, &wme_qdisc_ops, TC_H_ROOT);
681 if (!qdisc) {
682 printk(KERN_ERR "%s: qdisc installation failed\n", dev->name);
683 return;
684 }
685
686 /* same handle as would be allocated by qdisc_alloc_handle() */
687 qdisc->handle = 0x80010000;
688
689 qdisc_lock_tree(dev);
690 list_add_tail(&qdisc->list, &dev->qdisc_list);
691 dev->qdisc_sleeping = qdisc;
692 qdisc_unlock_tree(dev);
693 }
694
695
696 int ieee80211_qdisc_installed(struct net_device *dev)
697 {
698 return dev->qdisc_sleeping->ops == &wme_qdisc_ops;
699 }
700
701
702 int ieee80211_wme_register(void)
703 {
704 return register_qdisc(&wme_qdisc_ops);
705 }
706
707
708 void ieee80211_wme_unregister(void)
709 {
710 unregister_qdisc(&wme_qdisc_ops);
711 }
712 #endif /* CONFIG_NET_SCHED */