xref: /openbmc/linux/net/mac80211/wme.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 
33 	/* does the frame have a qos control field? */
34 	if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
35 		u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
36 		/* frame has qos control */
37 		tid = qc[0] & QOS_CONTROL_TID_MASK;
38 	} else {
39 		if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
40 			/* Separate TID for management frames */
41 			tid = NUM_RX_DATA_QUEUES - 1;
42 		} else {
43 			/* no qos control present */
44 			tid = 0; /* 802.1d - Best Effort */
45 		}
46 	}
47 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
48 	I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
49 	if (rx->sta) {
50 		I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
51 	}
52 #endif /* CONFIG_MAC80211_DEBUG_COUNTERS */
53 
54 	rx->u.rx.queue = tid;
55 	/* Set skb->priority to 1d tag if highest order bit of TID is not set.
56 	 * For now, set skb->priority to 0 for other cases. */
57 	rx->skb->priority = (tid > 7) ? 0 : tid;
58 
59 	return TXRX_CONTINUE;
60 }
61 
62 
63 ieee80211_txrx_result
64 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
65 {
66 	u16 fc = rx->fc;
67 	u8 *data = rx->skb->data;
68 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
69 
70 	if (!WLAN_FC_IS_QOS_DATA(fc))
71 		return TXRX_CONTINUE;
72 
73 	/* remove the qos control field, update frame type and meta-data */
74 	memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
75 	hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
76 	/* change frame type to non QOS */
77 	rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
78 	hdr->frame_control = cpu_to_le16(fc);
79 
80 	return TXRX_CONTINUE;
81 }
82 
83 
84 #ifdef CONFIG_NET_SCHED
85 /* maximum number of hardware queues we support. */
86 #define TC_80211_MAX_QUEUES 8
87 
88 struct ieee80211_sched_data
89 {
90 	struct tcf_proto *filter_list;
91 	struct Qdisc *queues[TC_80211_MAX_QUEUES];
92 	struct sk_buff_head requeued[TC_80211_MAX_QUEUES];
93 };
94 
95 
96 /* given a data frame determine the 802.1p/1d tag to use */
97 static inline unsigned classify_1d(struct sk_buff *skb, struct Qdisc *qd)
98 {
99 	struct iphdr *ip;
100 	int dscp;
101 	int offset;
102 
103 	struct ieee80211_sched_data *q = qdisc_priv(qd);
104 	struct tcf_result res = { -1, 0 };
105 
106 	/* if there is a user set filter list, call out to that */
107 	if (q->filter_list) {
108 		tc_classify(skb, q->filter_list, &res);
109 		if (res.class != -1)
110 			return res.class;
111 	}
112 
113 	/* skb->priority values from 256->263 are magic values to
114 	 * directly indicate a specific 802.1d priority.
115 	 * This is used to allow 802.1d priority to be passed directly in
116 	 * from VLAN tags, etc. */
117 	if (skb->priority >= 256 && skb->priority <= 263)
118 		return skb->priority - 256;
119 
120 	/* check there is a valid IP header present */
121 	offset = ieee80211_get_hdrlen_from_skb(skb) + 8 /* LLC + proto */;
122 	if (skb->protocol != __constant_htons(ETH_P_IP) ||
123 	    skb->len < offset + sizeof(*ip))
124 		return 0;
125 
126 	ip = (struct iphdr *) (skb->data + offset);
127 
128 	dscp = ip->tos & 0xfc;
129 	if (dscp & 0x1c)
130 		return 0;
131 	return dscp >> 5;
132 }
133 
134 
135 static inline int wme_downgrade_ac(struct sk_buff *skb)
136 {
137 	switch (skb->priority) {
138 	case 6:
139 	case 7:
140 		skb->priority = 5; /* VO -> VI */
141 		return 0;
142 	case 4:
143 	case 5:
144 		skb->priority = 3; /* VI -> BE */
145 		return 0;
146 	case 0:
147 	case 3:
148 		skb->priority = 2; /* BE -> BK */
149 		return 0;
150 	default:
151 		return -1;
152 	}
153 }
154 
155 
156 /* positive return value indicates which queue to use
157  * negative return value indicates to drop the frame */
158 static inline int classify80211(struct sk_buff *skb, struct Qdisc *qd)
159 {
160 	struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
161 	struct ieee80211_tx_packet_data *pkt_data =
162 		(struct ieee80211_tx_packet_data *) skb->cb;
163 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
164 	unsigned short fc = le16_to_cpu(hdr->frame_control);
165 	int qos;
166 	const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
167 
168 	/* see if frame is data or non data frame */
169 	if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) {
170 		/* management frames go on AC_VO queue, but are sent
171 		* without QoS control fields */
172 		return IEEE80211_TX_QUEUE_DATA0;
173 	}
174 
175 	if (unlikely(pkt_data->mgmt_iface)) {
176 		/* Data frames from hostapd (mainly, EAPOL) use AC_VO
177 		* and they will include QoS control fields if
178 		* the target STA is using WME. */
179 		skb->priority = 7;
180 		return ieee802_1d_to_ac[skb->priority];
181 	}
182 
183 	/* is this a QoS frame? */
184 	qos = fc & IEEE80211_STYPE_QOS_DATA;
185 
186 	if (!qos) {
187 		skb->priority = 0; /* required for correct WPA/11i MIC */
188 		return ieee802_1d_to_ac[skb->priority];
189 	}
190 
191 	/* use the data classifier to determine what 802.1d tag the
192 	* data frame has */
193 	skb->priority = classify_1d(skb, qd);
194 
195 	/* incase we are a client verify acm is not set for this ac */
196 	while (unlikely(local->wmm_acm & BIT(skb->priority))) {
197 		if (wme_downgrade_ac(skb)) {
198 			/* No AC with lower priority has acm=0,
199 			* drop packet. */
200 			return -1;
201 		}
202 	}
203 
204 	/* look up which queue to use for frames with this 1d tag */
205 	return ieee802_1d_to_ac[skb->priority];
206 }
207 
208 
209 static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
210 {
211 	struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
212 	struct ieee80211_sched_data *q = qdisc_priv(qd);
213 	struct ieee80211_tx_packet_data *pkt_data =
214 		(struct ieee80211_tx_packet_data *) skb->cb;
215 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
216 	unsigned short fc = le16_to_cpu(hdr->frame_control);
217 	struct Qdisc *qdisc;
218 	int err, queue;
219 
220 	if (pkt_data->requeue) {
221 		skb_queue_tail(&q->requeued[pkt_data->queue], skb);
222 		qd->q.qlen++;
223 		return 0;
224 	}
225 
226 	queue = classify80211(skb, qd);
227 
228 	/* now we know the 1d priority, fill in the QoS header if there is one
229 	 */
230 	if (WLAN_FC_IS_QOS_DATA(fc)) {
231 		u8 *p = skb->data + ieee80211_get_hdrlen(fc) - 2;
232 		u8 qos_hdr = skb->priority & QOS_CONTROL_TAG1D_MASK;
233 		if (local->wifi_wme_noack_test)
234 			qos_hdr |= QOS_CONTROL_ACK_POLICY_NOACK <<
235 					QOS_CONTROL_ACK_POLICY_SHIFT;
236 		/* qos header is 2 bytes, second reserved */
237 		*p = qos_hdr;
238 		p++;
239 		*p = 0;
240 	}
241 
242 	if (unlikely(queue >= local->hw.queues)) {
243 #if 0
244 		if (net_ratelimit()) {
245 			printk(KERN_DEBUG "%s - queue=%d (hw does not "
246 			       "support) -> %d\n",
247 			       __func__, queue, local->hw.queues - 1);
248 		}
249 #endif
250 		queue = local->hw.queues - 1;
251 	}
252 
253 	if (unlikely(queue < 0)) {
254 			kfree_skb(skb);
255 			err = NET_XMIT_DROP;
256 	} else {
257 		pkt_data->queue = (unsigned int) queue;
258 		qdisc = q->queues[queue];
259 		err = qdisc->enqueue(skb, qdisc);
260 		if (err == NET_XMIT_SUCCESS) {
261 			qd->q.qlen++;
262 			qd->bstats.bytes += skb->len;
263 			qd->bstats.packets++;
264 			return NET_XMIT_SUCCESS;
265 		}
266 	}
267 	qd->qstats.drops++;
268 	return err;
269 }
270 
271 
272 /* TODO: clean up the cases where master_hard_start_xmit
273  * returns non 0 - it shouldn't ever do that. Once done we
274  * can remove this function */
275 static int wme_qdiscop_requeue(struct sk_buff *skb, struct Qdisc* qd)
276 {
277 	struct ieee80211_sched_data *q = qdisc_priv(qd);
278 	struct ieee80211_tx_packet_data *pkt_data =
279 		(struct ieee80211_tx_packet_data *) skb->cb;
280 	struct Qdisc *qdisc;
281 	int err;
282 
283 	/* we recorded which queue to use earlier! */
284 	qdisc = q->queues[pkt_data->queue];
285 
286 	if ((err = qdisc->ops->requeue(skb, qdisc)) == 0) {
287 		qd->q.qlen++;
288 		return 0;
289 	}
290 	qd->qstats.drops++;
291 	return err;
292 }
293 
294 
295 static struct sk_buff *wme_qdiscop_dequeue(struct Qdisc* qd)
296 {
297 	struct ieee80211_sched_data *q = qdisc_priv(qd);
298 	struct net_device *dev = qd->dev;
299 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
300 	struct ieee80211_hw *hw = &local->hw;
301 	struct sk_buff *skb;
302 	struct Qdisc *qdisc;
303 	int queue;
304 
305 	/* check all the h/w queues in numeric/priority order */
306 	for (queue = 0; queue < hw->queues; queue++) {
307 		/* see if there is room in this hardware queue */
308 		if (test_bit(IEEE80211_LINK_STATE_XOFF,
309 			     &local->state[queue]) ||
310 		    test_bit(IEEE80211_LINK_STATE_PENDING,
311 			     &local->state[queue]))
312 			continue;
313 
314 		/* there is space - try and get a frame */
315 		skb = skb_dequeue(&q->requeued[queue]);
316 		if (skb) {
317 			qd->q.qlen--;
318 			return skb;
319 		}
320 
321 		qdisc = q->queues[queue];
322 		skb = qdisc->dequeue(qdisc);
323 		if (skb) {
324 			qd->q.qlen--;
325 			return skb;
326 		}
327 	}
328 	/* returning a NULL here when all the h/w queues are full means we
329 	 * never need to call netif_stop_queue in the driver */
330 	return NULL;
331 }
332 
333 
334 static void wme_qdiscop_reset(struct Qdisc* qd)
335 {
336 	struct ieee80211_sched_data *q = qdisc_priv(qd);
337 	struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
338 	struct ieee80211_hw *hw = &local->hw;
339 	int queue;
340 
341 	/* QUESTION: should we have some hardware flush functionality here? */
342 
343 	for (queue = 0; queue < hw->queues; queue++) {
344 		skb_queue_purge(&q->requeued[queue]);
345 		qdisc_reset(q->queues[queue]);
346 	}
347 	qd->q.qlen = 0;
348 }
349 
350 
351 static void wme_qdiscop_destroy(struct Qdisc* qd)
352 {
353 	struct ieee80211_sched_data *q = qdisc_priv(qd);
354 	struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
355 	struct ieee80211_hw *hw = &local->hw;
356 	int queue;
357 
358 	tcf_destroy_chain(q->filter_list);
359 	q->filter_list = NULL;
360 
361 	for (queue=0; queue < hw->queues; queue++) {
362 		skb_queue_purge(&q->requeued[queue]);
363 		qdisc_destroy(q->queues[queue]);
364 		q->queues[queue] = &noop_qdisc;
365 	}
366 }
367 
368 
369 /* called whenever parameters are updated on existing qdisc */
370 static int wme_qdiscop_tune(struct Qdisc *qd, struct rtattr *opt)
371 {
372 /*	struct ieee80211_sched_data *q = qdisc_priv(qd);
373 */
374 	/* check our options block is the right size */
375 	/* copy any options to our local structure */
376 /*	Ignore options block for now - always use static mapping
377 	struct tc_ieee80211_qopt *qopt = RTA_DATA(opt);
378 
379 	if (opt->rta_len < RTA_LENGTH(sizeof(*qopt)))
380 		return -EINVAL;
381 	memcpy(q->tag2queue, qopt->tag2queue, sizeof(qopt->tag2queue));
382 */
383 	return 0;
384 }
385 
386 
387 /* called during initial creation of qdisc on device */
388 static int wme_qdiscop_init(struct Qdisc *qd, struct rtattr *opt)
389 {
390 	struct ieee80211_sched_data *q = qdisc_priv(qd);
391 	struct net_device *dev = qd->dev;
392 	struct ieee80211_local *local;
393 	int queues;
394 	int err = 0, i;
395 
396 	/* check that device is a mac80211 device */
397 	if (!dev->ieee80211_ptr ||
398 	    dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
399 		return -EINVAL;
400 
401 	/* check this device is an ieee80211 master type device */
402 	if (dev->type != ARPHRD_IEEE80211)
403 		return -EINVAL;
404 
405 	/* check that there is no qdisc currently attached to device
406 	 * this ensures that we will be the root qdisc. (I can't find a better
407 	 * way to test this explicitly) */
408 	if (dev->qdisc_sleeping != &noop_qdisc)
409 		return -EINVAL;
410 
411 	if (qd->flags & TCQ_F_INGRESS)
412 		return -EINVAL;
413 
414 	local = wdev_priv(dev->ieee80211_ptr);
415 	queues = local->hw.queues;
416 
417 	/* if options were passed in, set them */
418 	if (opt) {
419 		err = wme_qdiscop_tune(qd, opt);
420 	}
421 
422 	/* create child queues */
423 	for (i = 0; i < queues; i++) {
424 		skb_queue_head_init(&q->requeued[i]);
425 		q->queues[i] = qdisc_create_dflt(qd->dev, &pfifo_qdisc_ops,
426 						 qd->handle);
427 		if (q->queues[i] == 0) {
428 			q->queues[i] = &noop_qdisc;
429 			printk(KERN_ERR "%s child qdisc %i creation failed", dev->name, i);
430 		}
431 	}
432 
433 	return err;
434 }
435 
436 static int wme_qdiscop_dump(struct Qdisc *qd, struct sk_buff *skb)
437 {
438 /*	struct ieee80211_sched_data *q = qdisc_priv(qd);
439 	unsigned char *p = skb->tail;
440 	struct tc_ieee80211_qopt opt;
441 
442 	memcpy(&opt.tag2queue, q->tag2queue, TC_80211_MAX_TAG + 1);
443 	RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
444 */	return skb->len;
445 /*
446 rtattr_failure:
447 	skb_trim(skb, p - skb->data);*/
448 	return -1;
449 }
450 
451 
452 static int wme_classop_graft(struct Qdisc *qd, unsigned long arg,
453 			     struct Qdisc *new, struct Qdisc **old)
454 {
455 	struct ieee80211_sched_data *q = qdisc_priv(qd);
456 	struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
457 	struct ieee80211_hw *hw = &local->hw;
458 	unsigned long queue = arg - 1;
459 
460 	if (queue >= hw->queues)
461 		return -EINVAL;
462 
463 	if (!new)
464 		new = &noop_qdisc;
465 
466 	sch_tree_lock(qd);
467 	*old = q->queues[queue];
468 	q->queues[queue] = new;
469 	qdisc_reset(*old);
470 	sch_tree_unlock(qd);
471 
472 	return 0;
473 }
474 
475 
476 static struct Qdisc *
477 wme_classop_leaf(struct Qdisc *qd, unsigned long arg)
478 {
479 	struct ieee80211_sched_data *q = qdisc_priv(qd);
480 	struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
481 	struct ieee80211_hw *hw = &local->hw;
482 	unsigned long queue = arg - 1;
483 
484 	if (queue >= hw->queues)
485 		return NULL;
486 
487 	return q->queues[queue];
488 }
489 
490 
491 static unsigned long wme_classop_get(struct Qdisc *qd, u32 classid)
492 {
493 	struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
494 	struct ieee80211_hw *hw = &local->hw;
495 	unsigned long queue = TC_H_MIN(classid);
496 
497 	if (queue - 1 >= hw->queues)
498 		return 0;
499 
500 	return queue;
501 }
502 
503 
504 static unsigned long wme_classop_bind(struct Qdisc *qd, unsigned long parent,
505 				      u32 classid)
506 {
507 	return wme_classop_get(qd, classid);
508 }
509 
510 
511 static void wme_classop_put(struct Qdisc *q, unsigned long cl)
512 {
513 }
514 
515 
516 static int wme_classop_change(struct Qdisc *qd, u32 handle, u32 parent,
517 			      struct rtattr **tca, unsigned long *arg)
518 {
519 	unsigned long cl = *arg;
520 	struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
521 	struct ieee80211_hw *hw = &local->hw;
522 
523 	if (cl - 1 > hw->queues)
524 		return -ENOENT;
525 
526 	/* TODO: put code to program hardware queue parameters here,
527 	 * to allow programming from tc command line */
528 
529 	return 0;
530 }
531 
532 
533 /* we don't support deleting hardware queues
534  * when we add WMM-SA support - TSPECs may be deleted here */
535 static int wme_classop_delete(struct Qdisc *qd, unsigned long cl)
536 {
537 	struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
538 	struct ieee80211_hw *hw = &local->hw;
539 
540 	if (cl - 1 > hw->queues)
541 		return -ENOENT;
542 	return 0;
543 }
544 
545 
546 static int wme_classop_dump_class(struct Qdisc *qd, unsigned long cl,
547 				  struct sk_buff *skb, struct tcmsg *tcm)
548 {
549 	struct ieee80211_sched_data *q = qdisc_priv(qd);
550 	struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
551 	struct ieee80211_hw *hw = &local->hw;
552 
553 	if (cl - 1 > hw->queues)
554 		return -ENOENT;
555 	tcm->tcm_handle = TC_H_MIN(cl);
556 	tcm->tcm_parent = qd->handle;
557 	tcm->tcm_info = q->queues[cl-1]->handle; /* do we need this? */
558 	return 0;
559 }
560 
561 
562 static void wme_classop_walk(struct Qdisc *qd, struct qdisc_walker *arg)
563 {
564 	struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
565 	struct ieee80211_hw *hw = &local->hw;
566 	int queue;
567 
568 	if (arg->stop)
569 		return;
570 
571 	for (queue = 0; queue < hw->queues; queue++) {
572 		if (arg->count < arg->skip) {
573 			arg->count++;
574 			continue;
575 		}
576 		/* we should return classids for our internal queues here
577 		 * as well as the external ones */
578 		if (arg->fn(qd, queue+1, arg) < 0) {
579 			arg->stop = 1;
580 			break;
581 		}
582 		arg->count++;
583 	}
584 }
585 
586 
587 static struct tcf_proto ** wme_classop_find_tcf(struct Qdisc *qd,
588 						unsigned long cl)
589 {
590 	struct ieee80211_sched_data *q = qdisc_priv(qd);
591 
592 	if (cl)
593 		return NULL;
594 
595 	return &q->filter_list;
596 }
597 
598 
599 /* this qdisc is classful (i.e. has classes, some of which may have leaf qdiscs attached)
600  * - these are the operations on the classes */
601 static struct Qdisc_class_ops class_ops =
602 {
603 	.graft = wme_classop_graft,
604 	.leaf = wme_classop_leaf,
605 
606 	.get = wme_classop_get,
607 	.put = wme_classop_put,
608 	.change = wme_classop_change,
609 	.delete = wme_classop_delete,
610 	.walk = wme_classop_walk,
611 
612 	.tcf_chain = wme_classop_find_tcf,
613 	.bind_tcf = wme_classop_bind,
614 	.unbind_tcf = wme_classop_put,
615 
616 	.dump = wme_classop_dump_class,
617 };
618 
619 
620 /* queueing discipline operations */
621 static struct Qdisc_ops wme_qdisc_ops =
622 {
623 	.next = NULL,
624 	.cl_ops = &class_ops,
625 	.id = "ieee80211",
626 	.priv_size = sizeof(struct ieee80211_sched_data),
627 
628 	.enqueue = wme_qdiscop_enqueue,
629 	.dequeue = wme_qdiscop_dequeue,
630 	.requeue = wme_qdiscop_requeue,
631 	.drop = NULL, /* drop not needed since we are always the root qdisc */
632 
633 	.init = wme_qdiscop_init,
634 	.reset = wme_qdiscop_reset,
635 	.destroy = wme_qdiscop_destroy,
636 	.change = wme_qdiscop_tune,
637 
638 	.dump = wme_qdiscop_dump,
639 };
640 
641 
642 void ieee80211_install_qdisc(struct net_device *dev)
643 {
644 	struct Qdisc *qdisc;
645 
646 	qdisc = qdisc_create_dflt(dev, &wme_qdisc_ops, TC_H_ROOT);
647 	if (!qdisc) {
648 		printk(KERN_ERR "%s: qdisc installation failed\n", dev->name);
649 		return;
650 	}
651 
652 	/* same handle as would be allocated by qdisc_alloc_handle() */
653 	qdisc->handle = 0x80010000;
654 
655 	qdisc_lock_tree(dev);
656 	list_add_tail(&qdisc->list, &dev->qdisc_list);
657 	dev->qdisc_sleeping = qdisc;
658 	qdisc_unlock_tree(dev);
659 }
660 
661 
662 int ieee80211_qdisc_installed(struct net_device *dev)
663 {
664 	return dev->qdisc_sleeping->ops == &wme_qdisc_ops;
665 }
666 
667 
668 int ieee80211_wme_register(void)
669 {
670 	return register_qdisc(&wme_qdisc_ops);
671 }
672 
673 
674 void ieee80211_wme_unregister(void)
675 {
676 	unregister_qdisc(&wme_qdisc_ops);
677 }
678 #endif /* CONFIG_NET_SCHED */
679