target/linux/package/ieee80211-dscape/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/config.h>
  10 #include <linux/version.h>
  11 #include <linux/netdevice.h>
  12 #include <linux/skbuff.h>
  13 #include <linux/module.h>
  14 #include <net/ip.h>
  15
  16 #include <net/ieee80211.h>
  17 #include "ieee80211_i.h"
  18 #include "wme.h"
  19
  20 #define CHILD_QDISC_OPS pfifo_qdisc_ops
  21
  22 static inline int WLAN_FC_IS_QOS_DATA(u16 fc)
  23 {
  24         return (fc & 0x8C) == 0x88;
  25 }
  26
  27
  28 ieee80211_txrx_result
  29 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
  30 {
  31         u8 *data = rx->skb->data;
  32         int tid;
  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                 /* frame has qos control */
  38                 tid = qc[0] & QOS_CONTROL_TID_MASK;
  39         } else {
  40                 if (unlikely(WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_MGMT)) {
  41                         /* Separate TID for management frames */
  42                         tid = NUM_RX_DATA_QUEUES - 1;
  43                 } else {
  44                         /* no qos control present */
  45                         tid = 0; /* 802.1d - Best Effort */
  46                 }
  47         }
  48 #ifdef CONFIG_IEEE80211_DEBUG_COUNTERS
  49         I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
  50         if (rx->sta) {
  51                 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
  52         }
  53 #endif /* CONFIG_IEEE80211_DEBUG_COUNTERS */
  54
  55         rx->u.rx.queue = tid;
  56         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
  57          * For now, set skb->priority to 0 for other cases. */
  58         rx->skb->priority = (tid > 7) ? 0 : tid;
  59
  60         return TXRX_CONTINUE;
  61 }
  62
  63
  64 ieee80211_txrx_result
  65 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
  66 {
  67         u16 fc = rx->fc;
  68         u8 *data = rx->skb->data;
  69         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
  70
  71         if (!WLAN_FC_IS_QOS_DATA(fc))
  72                 return TXRX_CONTINUE;
  73
  74         /* remove the qos control field, update frame type and meta-data */
  75         memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
  76         hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
  77         /* change frame type to non QOS */
  78         rx->fc = fc &= ~(WLAN_FC_STYPE_QOS_DATA << 4);
  79         hdr->frame_control = cpu_to_le16(fc);
  80
  81         return TXRX_CONTINUE;
  82 }
  83
  84
  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 #ifdef CONFIG_NET_SCHED
 104         struct ieee80211_sched_data *q = qdisc_priv(qd);
 105         struct tcf_result res = { -1, 0 };
 106
 107         /* if there is a user set filter list, call out to that */
 108         if (q->filter_list) {
 109                 tc_classify(skb, q->filter_list, &res);
 110                 if (res.class != -1)
 111                         return res.class;
 112         }
 113 #endif /* CONFIG_NET_SCHED */
 114
 115         /* skb->priority values from 256->263 are magic values to
 116          * directly indicate a specific 802.1d priority.
 117          * This is used to allow 802.1d priority to be passed directly in
 118          * from VLAN tags, etc. */
 119         if (skb->priority >= 256 && skb->priority <= 263)
 120                 return skb->priority - 256;
 121
 122         /* check there is a valid IP header present */
 123         offset = ieee80211_get_hdrlen_from_skb(skb) + 8 /* LLC + proto */;
 124         if (skb->protocol != __constant_htons(ETH_P_IP) ||
 125             skb->len < offset + sizeof(*ip))
 126                 return 0;
 127
 128         ip = (struct iphdr *) (skb->data + offset);
 129
 130         dscp = ip->tos & 0xfc;
 131         switch (dscp) {
 132         case 0x20:
 133                 return 2;
 134         case 0x40:
 135                 return 1;
 136         case 0x60:
 137                 return 3;
 138         case 0x80:
 139                 return 4;
 140         case 0xa0:
 141                 return 5;
 142         case 0xc0:
 143                 return 6;
 144         case 0xe0:
 145                 return 7;
 146         default:
 147                 return 0;
 148         }
 149 }
 150
 151
 152
 153
 154 static inline int wme_downgrade_ac(struct sk_buff *skb)
 155 {
 156         switch (skb->priority) {
 157         case 6:
 158         case 7:
 159                 skb->priority = 5; /* VO -> VI */
 160                 return 0;
 161         case 4:
 162         case 5:
 163                 skb->priority = 3; /* VI -> BE */
 164                 return 0;
 165         case 0:
 166         case 3:
 167                 skb->priority = 2; /* BE -> BK */
 168                 return 0;
 169         default:
 170                 return -1;
 171         }
 172 }
 173
 174
 175 /* positive return value indicates which queue to use
 176  * negative return value indicates to drop the frame */
 177 static inline int classify80211(struct sk_buff *skb, struct Qdisc *qd)
 178 {
 179         struct ieee80211_local *local = qd->dev->priv;
 180         struct ieee80211_tx_packet_data *pkt_data =
 181                 (struct ieee80211_tx_packet_data *) skb->cb;
 182         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 183         unsigned short fc = le16_to_cpu(hdr->frame_control);
 184         int qos;
 185         const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
 186
 187         if (unlikely(pkt_data->magic != IEEE80211_CB_MAGIC))
 188                 return -1;
 189
 190         /* see if frame is data or non data frame */
 191         if (unlikely(WLAN_FC_GET_TYPE(fc) != WLAN_FC_TYPE_DATA)) {
 192                 /* management frames go on AC_VO queue, but are sent
 193                 * without QoS control fields */
 194                 return IEEE80211_TX_QUEUE_DATA0;
 195         }
 196
 197         if (unlikely(pkt_data->sdata->type == IEEE80211_SUB_IF_TYPE_MGMT)) {
 198                 /* Data frames from hostapd (mainly, EAPOL) use AC_VO
 199                 * and they will include QoS control fields if
 200                 * the target STA is using WME. */
 201                 skb->priority = 7;
 202                 return ieee802_1d_to_ac[skb->priority];
 203         }
 204
 205
 206         /* is this a QoS frame? */
 207         qos = fc & (WLAN_FC_STYPE_QOS_DATA << 4);
 208
 209
 210         if (!qos) {
 211                 skb->priority = 0; /* required for correct WPA/11i MIC */
 212                 return ieee802_1d_to_ac[skb->priority];
 213         }
 214
 215         /* use the data classifier to determine what 802.1d tag the
 216         * data frame has */
 217         skb->priority = classify_1d(skb, qd);
 218
 219
 220         /* incase we are a client verify acm is not set for this ac */
 221         for (; unlikely(local->wmm_acm & BIT(skb->priority)); )
 222         {
 223                 if (wme_downgrade_ac(skb)) {
 224                         /* No AC with lower priority has acm=0,
 225                         * drop packet. */
 226                         return -1;
 227                 }
 228         }
 229
 230         /* look up which queue to use for frames with this 1d tag */
 231         return ieee802_1d_to_ac[skb->priority];
 232 }
 233
 234
 235 static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
 236 {
 237         struct ieee80211_local *local = qd->dev->priv;
 238         struct ieee80211_sched_data *q = qdisc_priv(qd);
 239         struct ieee80211_tx_packet_data *pkt_data =
 240                 (struct ieee80211_tx_packet_data *) skb->cb;
 241         struct ieee80211_tx_control *control = &pkt_data->control;
 242         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 243         unsigned short fc = le16_to_cpu(hdr->frame_control);
 244         struct Qdisc *qdisc;
 245         int err, queue;
 246
 247         if (control->requeue) {
 248                 skb_queue_tail(&q->requeued[control->queue], skb);
 249                 return 0;
 250         }
 251
 252         queue = classify80211(skb, qd);
 253
 254         /* now we know the 1d priority, fill in the QoS header if there is one */
 255         if (WLAN_FC_IS_QOS_DATA(fc)) {
 256                 struct qos_control *qc = (struct qos_control *) (skb->data + ieee80211_get_hdrlen(fc) - 2);
 257                 u8 *p = (u8 *) qc;
 258                 *p++ = 0; /* do this due to gcc's lack of optimization on bitfield ops */
 259                 *p = 0;
 260                 qc->tag1d = skb->priority;
 261                 if (local->wifi_wme_noack_test)
 262                         qc->ack_policy = 1;
 263         }
 264
 265         if (unlikely(queue >= local->hw->queues)) {
 266 #if 0
 267                 if (net_ratelimit()) {
 268                         printk(KERN_DEBUG "%s - queue=%d (hw does not "
 269                                "support) -> %d\n",
 270                                __func__, queue, local->hw->queues - 1);
 271                 }
 272 #endif
 273                 queue = local->hw->queues - 1;
 274         }
 275
 276         if (unlikely(queue < 0)) {
 277                         kfree_skb(skb);
 278                         err = NET_XMIT_DROP;
 279         } else {
 280                 control->queue = (unsigned int) queue;
 281                 qdisc = q->queues[queue];
 282                 err = qdisc->enqueue(skb, qdisc);
 283                 if (err == NET_XMIT_SUCCESS) {
 284                         qd->q.qlen++;
 285                         qd->bstats.bytes += skb->len;
 286                         qd->bstats.packets++;
 287                         return NET_XMIT_SUCCESS;
 288                 }
 289         }
 290         qd->qstats.drops++;
 291         return err;
 292 }
 293
 294
 295 /* TODO: clean up the cases where master_hard_start_xmit
 296  * returns non 0 - it shouldn't ever do that. Once done we
 297  * can remove this function */
 298 static int wme_qdiscop_requeue(struct sk_buff *skb, struct Qdisc* qd)
 299 {
 300         struct ieee80211_sched_data *q = qdisc_priv(qd);
 301         struct ieee80211_tx_packet_data *pkt_data =
 302                 (struct ieee80211_tx_packet_data *) skb->cb;
 303         struct Qdisc *qdisc;
 304         int err;
 305
 306         /* we recorded which queue to use earlier! */
 307         qdisc = q->queues[pkt_data->control.queue];
 308
 309         if ((err = qdisc->ops->requeue(skb, qdisc)) == 0) {
 310                 qd->q.qlen++;
 311                 return 0;
 312         }
 313         qd->qstats.drops++;
 314         return err;
 315 }
 316
 317
 318 static struct sk_buff *wme_qdiscop_dequeue(struct Qdisc* qd)
 319 {
 320         struct ieee80211_sched_data *q = qdisc_priv(qd);
 321         struct net_device *dev = qd->dev;
 322         struct ieee80211_local *local = dev->priv;
 323         struct ieee80211_hw *hw = local->hw;
 324         struct ieee80211_tx_queue_stats stats;
 325         struct sk_buff *skb;
 326         struct Qdisc *qdisc;
 327         int queue;
 328
 329         /* find which hardware queues have space in them */
 330         hw->get_tx_stats(dev, &stats);
 331
 332         /* check all the h/w queues in numeric/priority order */
 333         for (queue = 0; queue < hw->queues; queue++) {
 334                 /* see if there is room in this hardware queue */
 335                 if (stats.data[queue].len >= stats.data[queue].limit)
 336                         continue;
 337
 338                 /* there is space - try and get a frame */
 339                 skb = skb_dequeue(&q->requeued[queue]);
 340                 if (skb)
 341                         return skb;
 342
 343                 qdisc = q->queues[queue];
 344                 skb = qdisc->dequeue(qdisc);
 345                 if (skb) {
 346                         qd->q.qlen--;
 347                         return skb;
 348                 }
 349         }
 350         /* returning a NULL here when all the h/w queues are full means we
 351          * never need to call netif_stop_queue in the driver */
 352         return NULL;
 353 }
 354
 355
 356 static void wme_qdiscop_reset(struct Qdisc* qd)
 357 {
 358         struct ieee80211_sched_data *q = qdisc_priv(qd);
 359         struct ieee80211_local *local = qd->dev->priv;
 360         struct ieee80211_hw *hw = local->hw;
 361         int queue;
 362
 363         /* QUESTION: should we have some hardware flush functionality here? */
 364
 365         for (queue = 0; queue < hw->queues; queue++) {
 366                 skb_queue_purge(&q->requeued[queue]);
 367                 qdisc_reset(q->queues[queue]);
 368         }
 369         qd->q.qlen = 0;
 370 }
 371
 372
 373 static void wme_qdiscop_destroy(struct Qdisc* qd)
 374 {
 375         struct ieee80211_sched_data *q = qdisc_priv(qd);
 376         struct ieee80211_local *local = qd->dev->priv;
 377         struct ieee80211_hw *hw = local->hw;
 378         struct tcf_proto *tp;
 379         int queue;
 380
 381         while ((tp = q->filter_list) != NULL) {
 382                 q->filter_list = tp->next;
 383                 tp->ops->destroy(tp);
 384         }
 385
 386         for (queue=0; queue < hw->queues; queue++) {
 387                 skb_queue_purge(&q->requeued[queue]);
 388                 qdisc_destroy(q->queues[queue]);
 389                 q->queues[queue] = &noop_qdisc;
 390         }
 391 }
 392
 393
 394 /* called whenever parameters are updated on existing qdisc */
 395 static int wme_qdiscop_tune(struct Qdisc *qd, struct rtattr *opt)
 396 {
 397 /*      struct ieee80211_sched_data *q = qdisc_priv(qd);
 398 */
 399         /* check our options block is the right size */
 400         /* copy any options to our local structure */
 401 /*      Ignore options block for now - always use static mapping
 402         struct tc_ieee80211_qopt *qopt = RTA_DATA(opt);
 403
 404         if (opt->rta_len < RTA_LENGTH(sizeof(*qopt)))
 405                 return -EINVAL;
 406         memcpy(q->tag2queue, qopt->tag2queue, sizeof(qopt->tag2queue));
 407 */
 408         return 0;
 409 }
 410
 411
 412 /* called during initial creation of qdisc on device */
 413 static int wme_qdiscop_init(struct Qdisc *qd, struct rtattr *opt)
 414 {
 415         struct ieee80211_sched_data *q = qdisc_priv(qd);
 416         struct net_device *dev = qd->dev;
 417         struct ieee80211_local *local = dev->priv;
 418         int queues = local->hw->queues;
 419         int err = 0, i;
 420
 421         /* check this device is an ieee80211 master type device */
 422         if (dev->type != ARPHRD_IEEE80211)
 423                 return -EINVAL;
 424
 425         /* check that there is no qdisc currently attached to device
 426          * this ensures that we will be the root qdisc. (I can't find a better
 427          * way to test this explicitly) */
 428         if (dev->qdisc_sleeping != &noop_qdisc)
 429                 return -EINVAL;
 430
 431         if (qd->flags & TCQ_F_INGRESS)
 432                 return -EINVAL;
 433
 434         /* if options were passed in, set them */
 435         if (opt) {
 436                 err = wme_qdiscop_tune(qd, opt);
 437         }
 438
 439         /* create child queues */
 440         for (i = 0; i < queues; i++) {
 441                 skb_queue_head_init(&q->requeued[i]);
 442                 q->queues[i] = qdisc_create_dflt(qd->dev, &CHILD_QDISC_OPS);
 443                 if (q->queues[i] == 0) {
 444                         q->queues[i] = &noop_qdisc;
 445                         printk(KERN_ERR "%s child qdisc %i creation failed", dev->name, i);
 446                 }
 447         }
 448
 449         return err;
 450 }
 451
 452 static int wme_qdiscop_dump(struct Qdisc *qd, struct sk_buff *skb)
 453 {
 454 /*      struct ieee80211_sched_data *q = qdisc_priv(qd);
 455         unsigned char *p = skb->tail;
 456         struct tc_ieee80211_qopt opt;
 457
 458         memcpy(&opt.tag2queue, q->tag2queue, TC_80211_MAX_TAG + 1);
 459         RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
 460 */      return skb->len;
 461 /*
 462 rtattr_failure:
 463         skb_trim(skb, p - skb->data);*/
 464         return -1;
 465 }
 466
 467
 468 static int wme_classop_graft(struct Qdisc *qd, unsigned long arg,
 469                              struct Qdisc *new, struct Qdisc **old)
 470 {
 471         struct ieee80211_sched_data *q = qdisc_priv(qd);
 472         struct ieee80211_local *local = qd->dev->priv;
 473         struct ieee80211_hw *hw = local->hw;
 474         unsigned long queue = arg - 1;
 475
 476         if (queue >= hw->queues)
 477                 return -EINVAL;
 478
 479         if (new == NULL)
 480                 new = &noop_qdisc;
 481
 482         sch_tree_lock(qd);
 483         *old = q->queues[queue];
 484         q->queues[queue] = new;
 485         qdisc_reset(*old);
 486         sch_tree_unlock(qd);
 487
 488         return 0;
 489 }
 490
 491
 492 static struct Qdisc *
 493 wme_classop_leaf(struct Qdisc *qd, unsigned long arg)
 494 {
 495         struct ieee80211_sched_data *q = qdisc_priv(qd);
 496         struct ieee80211_local *local = qd->dev->priv;
 497         struct ieee80211_hw *hw = local->hw;
 498         unsigned long queue = arg - 1;
 499
 500         if (queue >= hw->queues)
 501                 return NULL;
 502
 503         return q->queues[queue];
 504 }
 505
 506
 507 static unsigned long wme_classop_get(struct Qdisc *qd, u32 classid)
 508 {
 509         struct ieee80211_local *local = qd->dev->priv;
 510         struct ieee80211_hw *hw = local->hw;
 511         unsigned long queue = TC_H_MIN(classid);
 512
 513         if (queue - 1 >= hw->queues)
 514                 return 0;
 515
 516         return queue;
 517 }
 518
 519
 520 static unsigned long wme_classop_bind(struct Qdisc *qd, unsigned long parent,
 521                                       u32 classid)
 522 {
 523         return wme_classop_get(qd, classid);
 524 }
 525
 526
 527 static void wme_classop_put(struct Qdisc *q, unsigned long cl)
 528 {
 529         /* printk(KERN_DEBUG "entering %s\n", __func__); */
 530 }
 531
 532
 533 static int wme_classop_change(struct Qdisc *qd, u32 handle, u32 parent,
 534                               struct rtattr **tca, unsigned long *arg)
 535 {
 536         unsigned long cl = *arg;
 537         struct ieee80211_local *local = qd->dev->priv;
 538         struct ieee80211_hw *hw = local->hw;
 539         /* printk(KERN_DEBUG "entering %s\n", __func__); */
 540
 541         if (cl - 1 > hw->queues)
 542                 return -ENOENT;
 543
 544         /* TODO: put code to program hardware queue parameters here,
 545          * to allow programming from tc command line */
 546
 547         return 0;
 548 }
 549
 550
 551 /* we don't support deleting hardware queues
 552  * when we add WMM-SA support - TSPECs may be deleted here */
 553 static int wme_classop_delete(struct Qdisc *qd, unsigned long cl)
 554 {
 555         struct ieee80211_local *local = qd->dev->priv;
 556         struct ieee80211_hw *hw = local->hw;
 557         /* printk(KERN_DEBUG "entering %s\n", __func__); */
 558
 559         if (cl - 1 > hw->queues)
 560                 return -ENOENT;
 561         return 0;
 562 }
 563
 564
 565 static int wme_classop_dump_class(struct Qdisc *qd, unsigned long cl,
 566                                   struct sk_buff *skb, struct tcmsg *tcm)
 567 {
 568         struct ieee80211_sched_data *q = qdisc_priv(qd);
 569         struct ieee80211_local *local = qd->dev->priv;
 570         struct ieee80211_hw *hw = local->hw;
 571         /* printk(KERN_DEBUG "entering %s\n", __func__); */
 572
 573         if (cl - 1 > hw->queues)
 574                 return -ENOENT;
 575         tcm->tcm_handle = TC_H_MIN(cl);
 576         tcm->tcm_parent = qd->handle;
 577         tcm->tcm_info = q->queues[cl-1]->handle; /* do we need this? */
 578         return 0;
 579 }
 580
 581
 582 static void wme_classop_walk(struct Qdisc *qd, struct qdisc_walker *arg)
 583 {
 584         struct ieee80211_local *local = qd->dev->priv;
 585         struct ieee80211_hw *hw = local->hw;
 586         int queue;
 587         /* printk(KERN_DEBUG "entering %s\n", __func__); */
 588
 589         if (arg->stop)
 590                 return;
 591
 592         for (queue = 0; queue < hw->queues; queue++) {
 593                 if (arg->count < arg->skip) {
 594                         arg->count++;
 595                         continue;
 596                 }
 597                 /* we should return classids for our internal queues here
 598                  * as well as the external ones */
 599                 if (arg->fn(qd, queue+1, arg) < 0) {
 600                         arg->stop = 1;
 601                         break;
 602                 }
 603                 arg->count++;
 604         }
 605 }
 606
 607
 608 static struct tcf_proto ** wme_classop_find_tcf(struct Qdisc *qd,
 609                                                 unsigned long cl)
 610 {
 611         struct ieee80211_sched_data *q = qdisc_priv(qd);
 612         /* printk("entering %s\n", __func__); */
 613
 614         if (cl)
 615                 return NULL;
 616
 617         return &q->filter_list;
 618 }
 619
 620
 621 /* this qdisc is classful (i.e. has classes, some of which may have leaf qdiscs attached)
 622  * - these are the operations on the classes */
 623 static struct Qdisc_class_ops class_ops =
 624 {
 625         .graft = wme_classop_graft,
 626         .leaf = wme_classop_leaf,
 627
 628         .get = wme_classop_get,
 629         .put = wme_classop_put,
 630         .change = wme_classop_change,
 631         .delete = wme_classop_delete,
 632         .walk = wme_classop_walk,
 633
 634         .tcf_chain = wme_classop_find_tcf,
 635         .bind_tcf = wme_classop_bind,
 636         .unbind_tcf = wme_classop_put,
 637
 638         .dump = wme_classop_dump_class,
 639 };
 640
 641
 642 /* queueing discipline operations */
 643 static struct Qdisc_ops wme_qdisc_ops =
 644 {
 645         .next = NULL,
 646         .cl_ops = &class_ops,
 647         .id = "ieee80211",
 648         .priv_size = sizeof(struct ieee80211_sched_data),
 649
 650         .enqueue = wme_qdiscop_enqueue,
 651         .dequeue = wme_qdiscop_dequeue,
 652         .requeue = wme_qdiscop_requeue,
 653         .drop = NULL, /* drop not needed since we are always the root qdisc */
 654
 655         .init = wme_qdiscop_init,
 656         .reset = wme_qdiscop_reset,
 657         .destroy = wme_qdiscop_destroy,
 658         .change = wme_qdiscop_tune,
 659
 660         .dump = wme_qdiscop_dump,
 661 };
 662
 663
 664 void ieee80211_install_qdisc(struct net_device *dev)
 665 {
 666         struct Qdisc *qdisc;
 667
 668         qdisc = qdisc_create_dflt(dev, &wme_qdisc_ops);
 669         if (qdisc == NULL) {
 670                 printk(KERN_ERR "%s: qdisc installation failed\n", dev->name);
 671                 return;
 672         }
 673
 674         /* same handle as would be allocated by qdisc_alloc_handle() */
 675         qdisc->handle = 0x80010000;
 676
 677         write_lock(&qdisc_tree_lock);
 678         list_add_tail(&qdisc->list, &dev->qdisc_list);
 679         dev->qdisc_sleeping = qdisc;
 680         write_unlock(&qdisc_tree_lock);
 681 }
 682
 683
 684 int ieee80211_wme_register(void)
 685 {
 686         int err = 0;
 687
 688 #ifdef CONFIG_NET_SCHED
 689         err = register_qdisc(&wme_qdisc_ops);
 690 #endif
 691         return err;
 692 }
 693
 694
 695 void ieee80211_wme_unregister(void)
 696 {
 697 #ifdef CONFIG_NET_SCHED
 698         unregister_qdisc(&wme_qdisc_ops);
 699 #endif
 700 }