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f0706e82 JB |
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 | ||
f0706e82 JB |
21 | /* maximum number of hardware queues we support. */ |
22 | #define TC_80211_MAX_QUEUES 8 | |
23 | ||
24 | struct ieee80211_sched_data | |
25 | { | |
26 | struct tcf_proto *filter_list; | |
27 | struct Qdisc *queues[TC_80211_MAX_QUEUES]; | |
28 | struct sk_buff_head requeued[TC_80211_MAX_QUEUES]; | |
29 | }; | |
30 | ||
31 | ||
32 | /* given a data frame determine the 802.1p/1d tag to use */ | |
33 | static inline unsigned classify_1d(struct sk_buff *skb, struct Qdisc *qd) | |
34 | { | |
35 | struct iphdr *ip; | |
36 | int dscp; | |
37 | int offset; | |
38 | ||
39 | struct ieee80211_sched_data *q = qdisc_priv(qd); | |
40 | struct tcf_result res = { -1, 0 }; | |
41 | ||
42 | /* if there is a user set filter list, call out to that */ | |
43 | if (q->filter_list) { | |
44 | tc_classify(skb, q->filter_list, &res); | |
45 | if (res.class != -1) | |
46 | return res.class; | |
47 | } | |
48 | ||
49 | /* skb->priority values from 256->263 are magic values to | |
50 | * directly indicate a specific 802.1d priority. | |
51 | * This is used to allow 802.1d priority to be passed directly in | |
52 | * from VLAN tags, etc. */ | |
53 | if (skb->priority >= 256 && skb->priority <= 263) | |
54 | return skb->priority - 256; | |
55 | ||
56 | /* check there is a valid IP header present */ | |
57 | offset = ieee80211_get_hdrlen_from_skb(skb) + 8 /* LLC + proto */; | |
58 | if (skb->protocol != __constant_htons(ETH_P_IP) || | |
59 | skb->len < offset + sizeof(*ip)) | |
60 | return 0; | |
61 | ||
62 | ip = (struct iphdr *) (skb->data + offset); | |
63 | ||
64 | dscp = ip->tos & 0xfc; | |
65 | if (dscp & 0x1c) | |
66 | return 0; | |
67 | return dscp >> 5; | |
68 | } | |
69 | ||
70 | ||
71 | static inline int wme_downgrade_ac(struct sk_buff *skb) | |
72 | { | |
73 | switch (skb->priority) { | |
74 | case 6: | |
75 | case 7: | |
76 | skb->priority = 5; /* VO -> VI */ | |
77 | return 0; | |
78 | case 4: | |
79 | case 5: | |
80 | skb->priority = 3; /* VI -> BE */ | |
81 | return 0; | |
82 | case 0: | |
83 | case 3: | |
84 | skb->priority = 2; /* BE -> BK */ | |
85 | return 0; | |
86 | default: | |
87 | return -1; | |
88 | } | |
89 | } | |
90 | ||
91 | ||
92 | /* positive return value indicates which queue to use | |
93 | * negative return value indicates to drop the frame */ | |
94 | static inline int classify80211(struct sk_buff *skb, struct Qdisc *qd) | |
95 | { | |
96 | struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr); | |
97 | struct ieee80211_tx_packet_data *pkt_data = | |
98 | (struct ieee80211_tx_packet_data *) skb->cb; | |
99 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
100 | unsigned short fc = le16_to_cpu(hdr->frame_control); | |
101 | int qos; | |
102 | const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 }; | |
103 | ||
104 | /* see if frame is data or non data frame */ | |
105 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) { | |
106 | /* management frames go on AC_VO queue, but are sent | |
107 | * without QoS control fields */ | |
108 | return IEEE80211_TX_QUEUE_DATA0; | |
109 | } | |
110 | ||
111 | if (unlikely(pkt_data->mgmt_iface)) { | |
112 | /* Data frames from hostapd (mainly, EAPOL) use AC_VO | |
113 | * and they will include QoS control fields if | |
114 | * the target STA is using WME. */ | |
115 | skb->priority = 7; | |
116 | return ieee802_1d_to_ac[skb->priority]; | |
117 | } | |
118 | ||
119 | /* is this a QoS frame? */ | |
120 | qos = fc & IEEE80211_STYPE_QOS_DATA; | |
121 | ||
122 | if (!qos) { | |
123 | skb->priority = 0; /* required for correct WPA/11i MIC */ | |
124 | return ieee802_1d_to_ac[skb->priority]; | |
125 | } | |
126 | ||
127 | /* use the data classifier to determine what 802.1d tag the | |
128 | * data frame has */ | |
129 | skb->priority = classify_1d(skb, qd); | |
130 | ||
131 | /* incase we are a client verify acm is not set for this ac */ | |
132 | while (unlikely(local->wmm_acm & BIT(skb->priority))) { | |
133 | if (wme_downgrade_ac(skb)) { | |
134 | /* No AC with lower priority has acm=0, | |
135 | * drop packet. */ | |
136 | return -1; | |
137 | } | |
138 | } | |
139 | ||
140 | /* look up which queue to use for frames with this 1d tag */ | |
141 | return ieee802_1d_to_ac[skb->priority]; | |
142 | } | |
143 | ||
144 | ||
145 | static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd) | |
146 | { | |
147 | struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr); | |
148 | struct ieee80211_sched_data *q = qdisc_priv(qd); | |
149 | struct ieee80211_tx_packet_data *pkt_data = | |
150 | (struct ieee80211_tx_packet_data *) skb->cb; | |
151 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
152 | unsigned short fc = le16_to_cpu(hdr->frame_control); | |
153 | struct Qdisc *qdisc; | |
154 | int err, queue; | |
155 | ||
156 | if (pkt_data->requeue) { | |
157 | skb_queue_tail(&q->requeued[pkt_data->queue], skb); | |
158 | qd->q.qlen++; | |
159 | return 0; | |
160 | } | |
161 | ||
162 | queue = classify80211(skb, qd); | |
163 | ||
164 | /* now we know the 1d priority, fill in the QoS header if there is one | |
165 | */ | |
166 | if (WLAN_FC_IS_QOS_DATA(fc)) { | |
167 | u8 *p = skb->data + ieee80211_get_hdrlen(fc) - 2; | |
168 | u8 qos_hdr = skb->priority & QOS_CONTROL_TAG1D_MASK; | |
169 | if (local->wifi_wme_noack_test) | |
170 | qos_hdr |= QOS_CONTROL_ACK_POLICY_NOACK << | |
171 | QOS_CONTROL_ACK_POLICY_SHIFT; | |
172 | /* qos header is 2 bytes, second reserved */ | |
173 | *p = qos_hdr; | |
174 | p++; | |
175 | *p = 0; | |
176 | } | |
177 | ||
178 | if (unlikely(queue >= local->hw.queues)) { | |
179 | #if 0 | |
180 | if (net_ratelimit()) { | |
181 | printk(KERN_DEBUG "%s - queue=%d (hw does not " | |
182 | "support) -> %d\n", | |
183 | __func__, queue, local->hw.queues - 1); | |
184 | } | |
185 | #endif | |
186 | queue = local->hw.queues - 1; | |
187 | } | |
188 | ||
189 | if (unlikely(queue < 0)) { | |
190 | kfree_skb(skb); | |
191 | err = NET_XMIT_DROP; | |
192 | } else { | |
193 | pkt_data->queue = (unsigned int) queue; | |
194 | qdisc = q->queues[queue]; | |
195 | err = qdisc->enqueue(skb, qdisc); | |
196 | if (err == NET_XMIT_SUCCESS) { | |
197 | qd->q.qlen++; | |
198 | qd->bstats.bytes += skb->len; | |
199 | qd->bstats.packets++; | |
200 | return NET_XMIT_SUCCESS; | |
201 | } | |
202 | } | |
203 | qd->qstats.drops++; | |
204 | return err; | |
205 | } | |
206 | ||
207 | ||
208 | /* TODO: clean up the cases where master_hard_start_xmit | |
209 | * returns non 0 - it shouldn't ever do that. Once done we | |
210 | * can remove this function */ | |
211 | static int wme_qdiscop_requeue(struct sk_buff *skb, struct Qdisc* qd) | |
212 | { | |
213 | struct ieee80211_sched_data *q = qdisc_priv(qd); | |
214 | struct ieee80211_tx_packet_data *pkt_data = | |
215 | (struct ieee80211_tx_packet_data *) skb->cb; | |
216 | struct Qdisc *qdisc; | |
217 | int err; | |
218 | ||
219 | /* we recorded which queue to use earlier! */ | |
220 | qdisc = q->queues[pkt_data->queue]; | |
221 | ||
222 | if ((err = qdisc->ops->requeue(skb, qdisc)) == 0) { | |
223 | qd->q.qlen++; | |
224 | return 0; | |
225 | } | |
226 | qd->qstats.drops++; | |
227 | return err; | |
228 | } | |
229 | ||
230 | ||
231 | static struct sk_buff *wme_qdiscop_dequeue(struct Qdisc* qd) | |
232 | { | |
233 | struct ieee80211_sched_data *q = qdisc_priv(qd); | |
234 | struct net_device *dev = qd->dev; | |
235 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
236 | struct ieee80211_hw *hw = &local->hw; | |
237 | struct sk_buff *skb; | |
238 | struct Qdisc *qdisc; | |
239 | int queue; | |
240 | ||
241 | /* check all the h/w queues in numeric/priority order */ | |
242 | for (queue = 0; queue < hw->queues; queue++) { | |
243 | /* see if there is room in this hardware queue */ | |
244 | if (test_bit(IEEE80211_LINK_STATE_XOFF, | |
245 | &local->state[queue]) || | |
246 | test_bit(IEEE80211_LINK_STATE_PENDING, | |
247 | &local->state[queue])) | |
248 | continue; | |
249 | ||
250 | /* there is space - try and get a frame */ | |
251 | skb = skb_dequeue(&q->requeued[queue]); | |
252 | if (skb) { | |
253 | qd->q.qlen--; | |
254 | return skb; | |
255 | } | |
256 | ||
257 | qdisc = q->queues[queue]; | |
258 | skb = qdisc->dequeue(qdisc); | |
259 | if (skb) { | |
260 | qd->q.qlen--; | |
261 | return skb; | |
262 | } | |
263 | } | |
264 | /* returning a NULL here when all the h/w queues are full means we | |
265 | * never need to call netif_stop_queue in the driver */ | |
266 | return NULL; | |
267 | } | |
268 | ||
269 | ||
270 | static void wme_qdiscop_reset(struct Qdisc* qd) | |
271 | { | |
272 | struct ieee80211_sched_data *q = qdisc_priv(qd); | |
273 | struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr); | |
274 | struct ieee80211_hw *hw = &local->hw; | |
275 | int queue; | |
276 | ||
277 | /* QUESTION: should we have some hardware flush functionality here? */ | |
278 | ||
279 | for (queue = 0; queue < hw->queues; queue++) { | |
280 | skb_queue_purge(&q->requeued[queue]); | |
281 | qdisc_reset(q->queues[queue]); | |
282 | } | |
283 | qd->q.qlen = 0; | |
284 | } | |
285 | ||
286 | ||
287 | static void wme_qdiscop_destroy(struct Qdisc* qd) | |
288 | { | |
289 | struct ieee80211_sched_data *q = qdisc_priv(qd); | |
290 | struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr); | |
291 | struct ieee80211_hw *hw = &local->hw; | |
292 | int queue; | |
293 | ||
294 | tcf_destroy_chain(q->filter_list); | |
295 | q->filter_list = NULL; | |
296 | ||
297 | for (queue=0; queue < hw->queues; queue++) { | |
298 | skb_queue_purge(&q->requeued[queue]); | |
299 | qdisc_destroy(q->queues[queue]); | |
300 | q->queues[queue] = &noop_qdisc; | |
301 | } | |
302 | } | |
303 | ||
304 | ||
305 | /* called whenever parameters are updated on existing qdisc */ | |
306 | static int wme_qdiscop_tune(struct Qdisc *qd, struct rtattr *opt) | |
307 | { | |
308 | /* struct ieee80211_sched_data *q = qdisc_priv(qd); | |
309 | */ | |
310 | /* check our options block is the right size */ | |
311 | /* copy any options to our local structure */ | |
312 | /* Ignore options block for now - always use static mapping | |
313 | struct tc_ieee80211_qopt *qopt = RTA_DATA(opt); | |
314 | ||
315 | if (opt->rta_len < RTA_LENGTH(sizeof(*qopt))) | |
316 | return -EINVAL; | |
317 | memcpy(q->tag2queue, qopt->tag2queue, sizeof(qopt->tag2queue)); | |
318 | */ | |
319 | return 0; | |
320 | } | |
321 | ||
322 | ||
323 | /* called during initial creation of qdisc on device */ | |
324 | static int wme_qdiscop_init(struct Qdisc *qd, struct rtattr *opt) | |
325 | { | |
326 | struct ieee80211_sched_data *q = qdisc_priv(qd); | |
327 | struct net_device *dev = qd->dev; | |
328 | struct ieee80211_local *local; | |
329 | int queues; | |
330 | int err = 0, i; | |
331 | ||
332 | /* check that device is a mac80211 device */ | |
333 | if (!dev->ieee80211_ptr || | |
334 | dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) | |
335 | return -EINVAL; | |
336 | ||
337 | /* check this device is an ieee80211 master type device */ | |
338 | if (dev->type != ARPHRD_IEEE80211) | |
339 | return -EINVAL; | |
340 | ||
341 | /* check that there is no qdisc currently attached to device | |
342 | * this ensures that we will be the root qdisc. (I can't find a better | |
343 | * way to test this explicitly) */ | |
344 | if (dev->qdisc_sleeping != &noop_qdisc) | |
345 | return -EINVAL; | |
346 | ||
347 | if (qd->flags & TCQ_F_INGRESS) | |
348 | return -EINVAL; | |
349 | ||
350 | local = wdev_priv(dev->ieee80211_ptr); | |
351 | queues = local->hw.queues; | |
352 | ||
353 | /* if options were passed in, set them */ | |
354 | if (opt) { | |
355 | err = wme_qdiscop_tune(qd, opt); | |
356 | } | |
357 | ||
358 | /* create child queues */ | |
359 | for (i = 0; i < queues; i++) { | |
360 | skb_queue_head_init(&q->requeued[i]); | |
361 | q->queues[i] = qdisc_create_dflt(qd->dev, &pfifo_qdisc_ops, | |
362 | qd->handle); | |
136e83d6 | 363 | if (!q->queues[i]) { |
f0706e82 JB |
364 | q->queues[i] = &noop_qdisc; |
365 | printk(KERN_ERR "%s child qdisc %i creation failed", dev->name, i); | |
366 | } | |
367 | } | |
368 | ||
369 | return err; | |
370 | } | |
371 | ||
372 | static int wme_qdiscop_dump(struct Qdisc *qd, struct sk_buff *skb) | |
373 | { | |
374 | /* struct ieee80211_sched_data *q = qdisc_priv(qd); | |
375 | unsigned char *p = skb->tail; | |
376 | struct tc_ieee80211_qopt opt; | |
377 | ||
378 | memcpy(&opt.tag2queue, q->tag2queue, TC_80211_MAX_TAG + 1); | |
379 | RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt); | |
380 | */ return skb->len; | |
381 | /* | |
382 | rtattr_failure: | |
383 | skb_trim(skb, p - skb->data);*/ | |
384 | return -1; | |
385 | } | |
386 | ||
387 | ||
388 | static int wme_classop_graft(struct Qdisc *qd, unsigned long arg, | |
389 | struct Qdisc *new, struct Qdisc **old) | |
390 | { | |
391 | struct ieee80211_sched_data *q = qdisc_priv(qd); | |
392 | struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr); | |
393 | struct ieee80211_hw *hw = &local->hw; | |
394 | unsigned long queue = arg - 1; | |
395 | ||
396 | if (queue >= hw->queues) | |
397 | return -EINVAL; | |
398 | ||
399 | if (!new) | |
400 | new = &noop_qdisc; | |
401 | ||
402 | sch_tree_lock(qd); | |
403 | *old = q->queues[queue]; | |
404 | q->queues[queue] = new; | |
405 | qdisc_reset(*old); | |
406 | sch_tree_unlock(qd); | |
407 | ||
408 | return 0; | |
409 | } | |
410 | ||
411 | ||
412 | static struct Qdisc * | |
413 | wme_classop_leaf(struct Qdisc *qd, unsigned long arg) | |
414 | { | |
415 | struct ieee80211_sched_data *q = qdisc_priv(qd); | |
416 | struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr); | |
417 | struct ieee80211_hw *hw = &local->hw; | |
418 | unsigned long queue = arg - 1; | |
419 | ||
420 | if (queue >= hw->queues) | |
421 | return NULL; | |
422 | ||
423 | return q->queues[queue]; | |
424 | } | |
425 | ||
426 | ||
427 | static unsigned long wme_classop_get(struct Qdisc *qd, u32 classid) | |
428 | { | |
429 | struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr); | |
430 | struct ieee80211_hw *hw = &local->hw; | |
431 | unsigned long queue = TC_H_MIN(classid); | |
432 | ||
433 | if (queue - 1 >= hw->queues) | |
434 | return 0; | |
435 | ||
436 | return queue; | |
437 | } | |
438 | ||
439 | ||
440 | static unsigned long wme_classop_bind(struct Qdisc *qd, unsigned long parent, | |
441 | u32 classid) | |
442 | { | |
443 | return wme_classop_get(qd, classid); | |
444 | } | |
445 | ||
446 | ||
447 | static void wme_classop_put(struct Qdisc *q, unsigned long cl) | |
448 | { | |
449 | } | |
450 | ||
451 | ||
452 | static int wme_classop_change(struct Qdisc *qd, u32 handle, u32 parent, | |
453 | struct rtattr **tca, unsigned long *arg) | |
454 | { | |
455 | unsigned long cl = *arg; | |
456 | struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr); | |
457 | struct ieee80211_hw *hw = &local->hw; | |
458 | ||
459 | if (cl - 1 > hw->queues) | |
460 | return -ENOENT; | |
461 | ||
462 | /* TODO: put code to program hardware queue parameters here, | |
463 | * to allow programming from tc command line */ | |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
468 | ||
469 | /* we don't support deleting hardware queues | |
470 | * when we add WMM-SA support - TSPECs may be deleted here */ | |
471 | static int wme_classop_delete(struct Qdisc *qd, unsigned long cl) | |
472 | { | |
473 | struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr); | |
474 | struct ieee80211_hw *hw = &local->hw; | |
475 | ||
476 | if (cl - 1 > hw->queues) | |
477 | return -ENOENT; | |
478 | return 0; | |
479 | } | |
480 | ||
481 | ||
482 | static int wme_classop_dump_class(struct Qdisc *qd, unsigned long cl, | |
483 | struct sk_buff *skb, struct tcmsg *tcm) | |
484 | { | |
485 | struct ieee80211_sched_data *q = qdisc_priv(qd); | |
486 | struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr); | |
487 | struct ieee80211_hw *hw = &local->hw; | |
488 | ||
489 | if (cl - 1 > hw->queues) | |
490 | return -ENOENT; | |
491 | tcm->tcm_handle = TC_H_MIN(cl); | |
492 | tcm->tcm_parent = qd->handle; | |
493 | tcm->tcm_info = q->queues[cl-1]->handle; /* do we need this? */ | |
494 | return 0; | |
495 | } | |
496 | ||
497 | ||
498 | static void wme_classop_walk(struct Qdisc *qd, struct qdisc_walker *arg) | |
499 | { | |
500 | struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr); | |
501 | struct ieee80211_hw *hw = &local->hw; | |
502 | int queue; | |
503 | ||
504 | if (arg->stop) | |
505 | return; | |
506 | ||
507 | for (queue = 0; queue < hw->queues; queue++) { | |
508 | if (arg->count < arg->skip) { | |
509 | arg->count++; | |
510 | continue; | |
511 | } | |
512 | /* we should return classids for our internal queues here | |
513 | * as well as the external ones */ | |
514 | if (arg->fn(qd, queue+1, arg) < 0) { | |
515 | arg->stop = 1; | |
516 | break; | |
517 | } | |
518 | arg->count++; | |
519 | } | |
520 | } | |
521 | ||
522 | ||
523 | static struct tcf_proto ** wme_classop_find_tcf(struct Qdisc *qd, | |
524 | unsigned long cl) | |
525 | { | |
526 | struct ieee80211_sched_data *q = qdisc_priv(qd); | |
527 | ||
528 | if (cl) | |
529 | return NULL; | |
530 | ||
531 | return &q->filter_list; | |
532 | } | |
533 | ||
534 | ||
535 | /* this qdisc is classful (i.e. has classes, some of which may have leaf qdiscs attached) | |
536 | * - these are the operations on the classes */ | |
537 | static struct Qdisc_class_ops class_ops = | |
538 | { | |
539 | .graft = wme_classop_graft, | |
540 | .leaf = wme_classop_leaf, | |
541 | ||
542 | .get = wme_classop_get, | |
543 | .put = wme_classop_put, | |
544 | .change = wme_classop_change, | |
545 | .delete = wme_classop_delete, | |
546 | .walk = wme_classop_walk, | |
547 | ||
548 | .tcf_chain = wme_classop_find_tcf, | |
549 | .bind_tcf = wme_classop_bind, | |
550 | .unbind_tcf = wme_classop_put, | |
551 | ||
552 | .dump = wme_classop_dump_class, | |
553 | }; | |
554 | ||
555 | ||
556 | /* queueing discipline operations */ | |
557 | static struct Qdisc_ops wme_qdisc_ops = | |
558 | { | |
559 | .next = NULL, | |
560 | .cl_ops = &class_ops, | |
561 | .id = "ieee80211", | |
562 | .priv_size = sizeof(struct ieee80211_sched_data), | |
563 | ||
564 | .enqueue = wme_qdiscop_enqueue, | |
565 | .dequeue = wme_qdiscop_dequeue, | |
566 | .requeue = wme_qdiscop_requeue, | |
567 | .drop = NULL, /* drop not needed since we are always the root qdisc */ | |
568 | ||
569 | .init = wme_qdiscop_init, | |
570 | .reset = wme_qdiscop_reset, | |
571 | .destroy = wme_qdiscop_destroy, | |
572 | .change = wme_qdiscop_tune, | |
573 | ||
574 | .dump = wme_qdiscop_dump, | |
575 | }; | |
576 | ||
577 | ||
578 | void ieee80211_install_qdisc(struct net_device *dev) | |
579 | { | |
580 | struct Qdisc *qdisc; | |
581 | ||
582 | qdisc = qdisc_create_dflt(dev, &wme_qdisc_ops, TC_H_ROOT); | |
583 | if (!qdisc) { | |
584 | printk(KERN_ERR "%s: qdisc installation failed\n", dev->name); | |
585 | return; | |
586 | } | |
587 | ||
588 | /* same handle as would be allocated by qdisc_alloc_handle() */ | |
589 | qdisc->handle = 0x80010000; | |
590 | ||
591 | qdisc_lock_tree(dev); | |
592 | list_add_tail(&qdisc->list, &dev->qdisc_list); | |
593 | dev->qdisc_sleeping = qdisc; | |
594 | qdisc_unlock_tree(dev); | |
595 | } | |
596 | ||
597 | ||
598 | int ieee80211_qdisc_installed(struct net_device *dev) | |
599 | { | |
600 | return dev->qdisc_sleeping->ops == &wme_qdisc_ops; | |
601 | } | |
602 | ||
603 | ||
604 | int ieee80211_wme_register(void) | |
605 | { | |
606 | return register_qdisc(&wme_qdisc_ops); | |
607 | } | |
608 | ||
609 | ||
610 | void ieee80211_wme_unregister(void) | |
611 | { | |
612 | unregister_qdisc(&wme_qdisc_ops); | |
613 | } |