net/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
  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 */