package/d80211/src/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/d80211.h>
  18 #include "ieee80211_i.h"
  19 #include "wme.h"
  20
  21 #define CHILD_QDISC_OPS pfifo_qdisc_ops
  22
  23 static inline int WLAN_FC_IS_QOS_DATA(u16 fc)
  24 {
  25         return (fc & 0x8C) == 0x88;
  26 }
  27
  28
  29 ieee80211_txrx_result
  30 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
  31 {
  32         u8 *data = rx->skb->data;
  33         int tid;
  34
  35         /* does the frame have a qos control field? */
  36         if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
  37                 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
  38                 /* frame has qos control */
  39                 tid = qc[0] & QOS_CONTROL_TID_MASK;
  40         } else {
  41                 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
  42                         /* Separate TID for management frames */
  43                         tid = NUM_RX_DATA_QUEUES - 1;
  44                 } else {
  45                         /* no qos control present */
  46                         tid = 0; /* 802.1d - Best Effort */
  47                 }
  48         }
  49 #ifdef CONFIG_D80211_DEBUG_COUNTERS
  50         I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
  51         if (rx->sta) {
  52                 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
  53         }
  54 #endif /* CONFIG_D80211_DEBUG_COUNTERS */
  55
  56         rx->u.rx.queue = tid;
  57         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
  58          * For now, set skb->priority to 0 for other cases. */
  59         rx->skb->priority = (tid > 7) ? 0 : tid;
  60
  61         return TXRX_CONTINUE;
  62 }
  63
  64
  65 ieee80211_txrx_result
  66 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
  67 {
  68         u16 fc = rx->fc;
  69         u8 *data = rx->skb->data;
  70         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
  71
  72         if (!WLAN_FC_IS_QOS_DATA(fc))
  73                 return TXRX_CONTINUE;
  74
  75         /* remove the qos control field, update frame type and meta-data */
  76         memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
  77         hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
  78         /* change frame type to non QOS */
  79         rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
  80         hdr->frame_control = cpu_to_le16(fc);
  81
  82         return TXRX_CONTINUE;
  83 }
  84
  85
  86 /* maximum number of hardware queues we support. */
  87 #define TC_80211_MAX_QUEUES 8
  88
  89 struct ieee80211_sched_data
  90 {
  91         struct tcf_proto *filter_list;
  92         struct Qdisc *queues[TC_80211_MAX_QUEUES];
  93         struct sk_buff_head requeued[TC_80211_MAX_QUEUES];
  94 };
  95
  96
  97 /* given a data frame determine the 802.1p/1d tag to use */
  98 static inline unsigned classify_1d(struct sk_buff *skb, struct Qdisc *qd)
  99 {
 100         struct iphdr *ip;
 101         int dscp;
 102         int offset;
 103
 104 #ifdef CONFIG_NET_SCHED
 105         struct ieee80211_sched_data *q = qdisc_priv(qd);
 106         struct tcf_result res = { -1, 0 };
 107
 108         /* if there is a user set filter list, call out to that */
 109         if (q->filter_list) {
 110                 tc_classify(skb, q->filter_list, &res);
 111                 if (res.class != -1)
 112                         return res.class;
 113         }
 114 #endif /* CONFIG_NET_SCHED */
 115
 116         /* skb->priority values from 256->263 are magic values to
 117          * directly indicate a specific 802.1d priority.
 118          * This is used to allow 802.1d priority to be passed directly in
 119          * from VLAN tags, etc. */
 120         if (skb->priority >= 256 && skb->priority <= 263)
 121                 return skb->priority - 256;
 122
 123         /* check there is a valid IP header present */
 124         offset = ieee80211_get_hdrlen_from_skb(skb) + 8 /* LLC + proto */;
 125         if (skb->protocol != __constant_htons(ETH_P_IP) ||
 126             skb->len < offset + sizeof(*ip))
 127                 return 0;
 128
 129         ip = (struct iphdr *) (skb->data + offset);
 130
 131         dscp = ip->tos & 0xfc;
 132         if (dscp & 0x1c)
 133                 return 0;
 134         return dscp >> 5;
 135 }
 136
 137
 138 static inline int wme_downgrade_ac(struct sk_buff *skb)
 139 {
 140         switch (skb->priority) {
 141         case 6:
 142         case 7:
 143                 skb->priority = 5; /* VO -> VI */
 144                 return 0;
 145         case 4:
 146         case 5:
 147                 skb->priority = 3; /* VI -> BE */
 148                 return 0;
 149         case 0:
 150         case 3:
 151                 skb->priority = 2; /* BE -> BK */
 152                 return 0;
 153         default:
 154                 return -1;
 155         }
 156 }
 157
 158
 159 /* positive return value indicates which queue to use
 160  * negative return value indicates to drop the frame */
 161 static inline int classify80211(struct sk_buff *skb, struct Qdisc *qd)
 162 {
 163         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 164         struct ieee80211_tx_packet_data *pkt_data =
 165                 (struct ieee80211_tx_packet_data *) skb->cb;
 166         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 167         unsigned short fc = le16_to_cpu(hdr->frame_control);
 168         int qos;
 169         const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
 170
 171         /* see if frame is data or non data frame */
 172         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) {
 173                 /* management frames go on AC_VO queue, but are sent
 174                 * without QoS control fields */
 175                 return IEEE80211_TX_QUEUE_DATA0;
 176         }
 177
 178         if (unlikely(pkt_data->mgmt_iface)) {
 179                 /* Data frames from hostapd (mainly, EAPOL) use AC_VO
 180                 * and they will include QoS control fields if
 181                 * the target STA is using WME. */
 182                 skb->priority = 7;
 183                 return ieee802_1d_to_ac[skb->priority];
 184         }
 185
 186         /* is this a QoS frame? */
 187         qos = fc & IEEE80211_STYPE_QOS_DATA;
 188
 189         if (!qos) {
 190                 skb->priority = 0; /* required for correct WPA/11i MIC */
 191                 return ieee802_1d_to_ac[skb->priority];
 192         }
 193
 194         /* use the data classifier to determine what 802.1d tag the
 195         * data frame has */
 196         skb->priority = classify_1d(skb, qd);
 197
 198         /* incase we are a client verify acm is not set for this ac */
 199         while (unlikely(local->wmm_acm & BIT(skb->priority))) {
 200                 if (wme_downgrade_ac(skb)) {
 201                         /* No AC with lower priority has acm=0,
 202                         * drop packet. */
 203                         return -1;
 204                 }
 205         }
 206
 207         /* look up which queue to use for frames with this 1d tag */
 208         return ieee802_1d_to_ac[skb->priority];
 209 }
 210
 211
 212 static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
 213 {
 214         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 215         struct ieee80211_sched_data *q = qdisc_priv(qd);
 216         struct ieee80211_tx_packet_data *pkt_data =
 217                 (struct ieee80211_tx_packet_data *) skb->cb;
 218         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 219         unsigned short fc = le16_to_cpu(hdr->frame_control);
 220         struct Qdisc *qdisc;
 221         int err, queue;
 222
 223         if (pkt_data->requeue) {
 224                 skb_queue_tail(&q->requeued[pkt_data->queue], skb);
 225                 return 0;
 226         }
 227
 228         queue = classify80211(skb, qd);
 229
 230         /* now we know the 1d priority, fill in the QoS header if there is one
 231          */
 232         if (WLAN_FC_IS_QOS_DATA(fc)) {
 233                 u8 *p = skb->data + ieee80211_get_hdrlen(fc) - 2;
 234                 u8 qos_hdr = skb->priority & QOS_CONTROL_TAG1D_MASK;
 235                 if (local->wifi_wme_noack_test)
 236                         qos_hdr |= QOS_CONTROL_ACK_POLICY_NOACK <<
 237                                         QOS_CONTROL_ACK_POLICY_SHIFT;
 238                 /* qos header is 2 bytes, second reserved */
 239                 *p = qos_hdr;
 240                 p++;
 241                 *p = 0;
 242         }
 243
 244         if (unlikely(queue >= local->hw.queues)) {
 245 #if 0
 246                 if (net_ratelimit()) {
 247                         printk(KERN_DEBUG "%s - queue=%d (hw does not "
 248                                "support) -> %d\n",
 249                                __func__, queue, local->hw.queues - 1);
 250                 }
 251 #endif
 252                 queue = local->hw.queues - 1;
 253         }
 254
 255         if (unlikely(queue < 0)) {
 256                         kfree_skb(skb);
 257                         err = NET_XMIT_DROP;
 258         } else {
 259                 pkt_data->queue = (unsigned int) queue;
 260                 qdisc = q->queues[queue];
 261                 err = qdisc->enqueue(skb, qdisc);
 262                 if (err == NET_XMIT_SUCCESS) {
 263                         qd->q.qlen++;
 264                         qd->bstats.bytes += skb->len;
 265                         qd->bstats.packets++;
 266                         return NET_XMIT_SUCCESS;
 267                 }
 268         }
 269         qd->qstats.drops++;
 270         return err;
 271 }
 272
 273
 274 /* TODO: clean up the cases where master_hard_start_xmit
 275  * returns non 0 - it shouldn't ever do that. Once done we
 276  * can remove this function */
 277 static int wme_qdiscop_requeue(struct sk_buff *skb, struct Qdisc* qd)
 278 {
 279         struct ieee80211_sched_data *q = qdisc_priv(qd);
 280         struct ieee80211_tx_packet_data *pkt_data =
 281                 (struct ieee80211_tx_packet_data *) skb->cb;
 282         struct Qdisc *qdisc;
 283         int err;
 284
 285         /* we recorded which queue to use earlier! */
 286         qdisc = q->queues[pkt_data->queue];
 287
 288         if ((err = qdisc->ops->requeue(skb, qdisc)) == 0) {
 289                 qd->q.qlen++;
 290                 return 0;
 291         }
 292         qd->qstats.drops++;
 293         return err;
 294 }
 295
 296
 297 static struct sk_buff *wme_qdiscop_dequeue(struct Qdisc* qd)
 298 {
 299         struct ieee80211_sched_data *q = qdisc_priv(qd);
 300         struct net_device *dev = qd->dev;
 301         struct ieee80211_local *local = dev->ieee80211_ptr;
 302         struct ieee80211_hw *hw = &local->hw;
 303         struct sk_buff *skb;
 304         struct Qdisc *qdisc;
 305         int queue;
 306
 307         /* check all the h/w queues in numeric/priority order */
 308         for (queue = 0; queue < hw->queues; queue++) {
 309                 /* see if there is room in this hardware queue */
 310                 if (test_bit(IEEE80211_LINK_STATE_XOFF,
 311                              &local->state[queue]) ||
 312                     test_bit(IEEE80211_LINK_STATE_PENDING,
 313                              &local->state[queue]))
 314                         continue;
 315
 316                 /* there is space - try and get a frame */
 317                 skb = skb_dequeue(&q->requeued[queue]);
 318                 if (skb)
 319                         return skb;
 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 = 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 = qd->dev->ieee80211_ptr;
 355         struct ieee80211_hw *hw = &local->hw;
 356         struct tcf_proto *tp;
 357         int queue;
 358
 359         while ((tp = q->filter_list) != NULL) {
 360                 q->filter_list = tp->next;
 361                 tp->ops->destroy(tp);
 362         }
 363
 364         for (queue=0; queue < hw->queues; queue++) {
 365                 skb_queue_purge(&q->requeued[queue]);
 366                 qdisc_destroy(q->queues[queue]);
 367                 q->queues[queue] = &noop_qdisc;
 368         }
 369 }
 370
 371
 372 /* called whenever parameters are updated on existing qdisc */
 373 static int wme_qdiscop_tune(struct Qdisc *qd, struct rtattr *opt)
 374 {
 375 /*      struct ieee80211_sched_data *q = qdisc_priv(qd);
 376 */
 377         /* check our options block is the right size */
 378         /* copy any options to our local structure */
 379 /*      Ignore options block for now - always use static mapping
 380         struct tc_ieee80211_qopt *qopt = RTA_DATA(opt);
 381
 382         if (opt->rta_len < RTA_LENGTH(sizeof(*qopt)))
 383                 return -EINVAL;
 384         memcpy(q->tag2queue, qopt->tag2queue, sizeof(qopt->tag2queue));
 385 */
 386         return 0;
 387 }
 388
 389
 390 /* called during initial creation of qdisc on device */
 391 static int wme_qdiscop_init(struct Qdisc *qd, struct rtattr *opt)
 392 {
 393         struct ieee80211_sched_data *q = qdisc_priv(qd);
 394         struct net_device *dev = qd->dev;
 395         struct ieee80211_local *local = dev->ieee80211_ptr;
 396         int queues = local->hw.queues;
 397         int err = 0, i;
 398
 399         /* check this device is an ieee80211 master type device */
 400         if (dev->type != ARPHRD_IEEE80211)
 401                 return -EINVAL;
 402
 403         /* check that there is no qdisc currently attached to device
 404          * this ensures that we will be the root qdisc. (I can't find a better
 405          * way to test this explicitly) */
 406         if (dev->qdisc_sleeping != &noop_qdisc)
 407                 return -EINVAL;
 408
 409         if (qd->flags & TCQ_F_INGRESS)
 410                 return -EINVAL;
 411
 412         /* if options were passed in, set them */
 413         if (opt) {
 414                 err = wme_qdiscop_tune(qd, opt);
 415         }
 416
 417         /* create child queues */
 418         for (i = 0; i < queues; i++) {
 419                 skb_queue_head_init(&q->requeued[i]);
 420                 q->queues[i] = qdisc_create_dflt(qd->dev, &CHILD_QDISC_OPS,
 421                                                  qd->handle);
 422                 if (q->queues[i] == 0) {
 423                         q->queues[i] = &noop_qdisc;
 424                         printk(KERN_ERR "%s child qdisc %i creation failed", dev->name, i);
 425                 }
 426         }
 427
 428         return err;
 429 }
 430
 431 static int wme_qdiscop_dump(struct Qdisc *qd, struct sk_buff *skb)
 432 {
 433 /*      struct ieee80211_sched_data *q = qdisc_priv(qd);
 434         unsigned char *p = skb->tail;
 435         struct tc_ieee80211_qopt opt;
 436
 437         memcpy(&opt.tag2queue, q->tag2queue, TC_80211_MAX_TAG + 1);
 438         RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
 439 */      return skb->len;
 440 /*
 441 rtattr_failure:
 442         skb_trim(skb, p - skb->data);*/
 443         return -1;
 444 }
 445
 446
 447 static int wme_classop_graft(struct Qdisc *qd, unsigned long arg,
 448                              struct Qdisc *new, struct Qdisc **old)
 449 {
 450         struct ieee80211_sched_data *q = qdisc_priv(qd);
 451         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 452         struct ieee80211_hw *hw = &local->hw;
 453         unsigned long queue = arg - 1;
 454
 455         if (queue >= hw->queues)
 456                 return -EINVAL;
 457
 458         if (!new)
 459                 new = &noop_qdisc;
 460
 461         sch_tree_lock(qd);
 462         *old = q->queues[queue];
 463         q->queues[queue] = new;
 464         qdisc_reset(*old);
 465         sch_tree_unlock(qd);
 466
 467         return 0;
 468 }
 469
 470
 471 static struct Qdisc *
 472 wme_classop_leaf(struct Qdisc *qd, unsigned long arg)
 473 {
 474         struct ieee80211_sched_data *q = qdisc_priv(qd);
 475         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 476         struct ieee80211_hw *hw = &local->hw;
 477         unsigned long queue = arg - 1;
 478
 479         if (queue >= hw->queues)
 480                 return NULL;
 481
 482         return q->queues[queue];
 483 }
 484
 485
 486 static unsigned long wme_classop_get(struct Qdisc *qd, u32 classid)
 487 {
 488         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 489         struct ieee80211_hw *hw = &local->hw;
 490         unsigned long queue = TC_H_MIN(classid);
 491
 492         if (queue - 1 >= hw->queues)
 493                 return 0;
 494
 495         return queue;
 496 }
 497
 498
 499 static unsigned long wme_classop_bind(struct Qdisc *qd, unsigned long parent,
 500                                       u32 classid)
 501 {
 502         return wme_classop_get(qd, classid);
 503 }
 504
 505
 506 static void wme_classop_put(struct Qdisc *q, unsigned long cl)
 507 {
 508         /* printk(KERN_DEBUG "entering %s\n", __func__); */
 509 }
 510
 511
 512 static int wme_classop_change(struct Qdisc *qd, u32 handle, u32 parent,
 513                               struct rtattr **tca, unsigned long *arg)
 514 {
 515         unsigned long cl = *arg;
 516         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 517         struct ieee80211_hw *hw = &local->hw;
 518         /* printk(KERN_DEBUG "entering %s\n", __func__); */
 519
 520         if (cl - 1 > hw->queues)
 521                 return -ENOENT;
 522
 523         /* TODO: put code to program hardware queue parameters here,
 524          * to allow programming from tc command line */
 525
 526         return 0;
 527 }
 528
 529
 530 /* we don't support deleting hardware queues
 531  * when we add WMM-SA support - TSPECs may be deleted here */
 532 static int wme_classop_delete(struct Qdisc *qd, unsigned long cl)
 533 {
 534         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 535         struct ieee80211_hw *hw = &local->hw;
 536         /* printk(KERN_DEBUG "entering %s\n", __func__); */
 537
 538         if (cl - 1 > hw->queues)
 539                 return -ENOENT;
 540         return 0;
 541 }
 542
 543
 544 static int wme_classop_dump_class(struct Qdisc *qd, unsigned long cl,
 545                                   struct sk_buff *skb, struct tcmsg *tcm)
 546 {
 547         struct ieee80211_sched_data *q = qdisc_priv(qd);
 548         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 549         struct ieee80211_hw *hw = &local->hw;
 550         /* printk(KERN_DEBUG "entering %s\n", __func__); */
 551
 552         if (cl - 1 > hw->queues)
 553                 return -ENOENT;
 554         tcm->tcm_handle = TC_H_MIN(cl);
 555         tcm->tcm_parent = qd->handle;
 556         tcm->tcm_info = q->queues[cl-1]->handle; /* do we need this? */
 557         return 0;
 558 }
 559
 560
 561 static void wme_classop_walk(struct Qdisc *qd, struct qdisc_walker *arg)
 562 {
 563         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 564         struct ieee80211_hw *hw = &local->hw;
 565         int queue;
 566         /* printk(KERN_DEBUG "entering %s\n", __func__); */
 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         /* printk("entering %s\n", __func__); */
 592
 593         if (cl)
 594                 return NULL;
 595
 596         return &q->filter_list;
 597 }
 598
 599
 600 /* this qdisc is classful (i.e. has classes, some of which may have leaf qdiscs attached)
 601  * - these are the operations on the classes */
 602 static struct Qdisc_class_ops class_ops =
 603 {
 604         .graft = wme_classop_graft,
 605         .leaf = wme_classop_leaf,
 606
 607         .get = wme_classop_get,
 608         .put = wme_classop_put,
 609         .change = wme_classop_change,
 610         .delete = wme_classop_delete,
 611         .walk = wme_classop_walk,
 612
 613         .tcf_chain = wme_classop_find_tcf,
 614         .bind_tcf = wme_classop_bind,
 615         .unbind_tcf = wme_classop_put,
 616
 617         .dump = wme_classop_dump_class,
 618 };
 619
 620
 621 /* queueing discipline operations */
 622 static struct Qdisc_ops wme_qdisc_ops =
 623 {
 624         .next = NULL,
 625         .cl_ops = &class_ops,
 626         .id = "ieee80211",
 627         .priv_size = sizeof(struct ieee80211_sched_data),
 628
 629         .enqueue = wme_qdiscop_enqueue,
 630         .dequeue = wme_qdiscop_dequeue,
 631         .requeue = wme_qdiscop_requeue,
 632         .drop = NULL, /* drop not needed since we are always the root qdisc */
 633
 634         .init = wme_qdiscop_init,
 635         .reset = wme_qdiscop_reset,
 636         .destroy = wme_qdiscop_destroy,
 637         .change = wme_qdiscop_tune,
 638
 639         .dump = wme_qdiscop_dump,
 640 };
 641
 642
 643 void ieee80211_install_qdisc(struct net_device *dev)
 644 {
 645         struct Qdisc *qdisc;
 646
 647         qdisc = qdisc_create_dflt(dev, &wme_qdisc_ops, TC_H_ROOT);
 648         if (!qdisc) {
 649                 printk(KERN_ERR "%s: qdisc installation failed\n", dev->name);
 650                 return;
 651         }
 652
 653         /* same handle as would be allocated by qdisc_alloc_handle() */
 654         qdisc->handle = 0x80010000;
 655
 656         qdisc_lock_tree(dev);
 657         list_add_tail(&qdisc->list, &dev->qdisc_list);
 658         dev->qdisc_sleeping = qdisc;
 659         qdisc_unlock_tree(dev);
 660 }
 661
 662
 663 int ieee80211_wme_register(void)
 664 {
 665         int err = 0;
 666
 667 #ifdef CONFIG_NET_SCHED
 668         err = register_qdisc(&wme_qdisc_ops);
 669 #endif
 670         return err;
 671 }
 672
 673
 674 void ieee80211_wme_unregister(void)
 675 {
 676 #ifdef CONFIG_NET_SCHED
 677         unregister_qdisc(&wme_qdisc_ops);
 678 #endif
 679 }