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         switch (dscp) {
 133         case 0x20:
 134                 return 2;
 135         case 0x40:
 136                 return 1;
 137         case 0x60:
 138                 return 3;
 139         case 0x80:
 140                 return 4;
 141         case 0xa0:
 142                 return 5;
 143         case 0xc0:
 144                 return 6;
 145         case 0xe0:
 146                 return 7;
 147         default:
 148                 return 0;
 149         }
 150 }
 151
 152
 153 static inline int wme_downgrade_ac(struct sk_buff *skb)
 154 {
 155         switch (skb->priority) {
 156         case 6:
 157         case 7:
 158                 skb->priority = 5; /* VO -> VI */
 159                 return 0;
 160         case 4:
 161         case 5:
 162                 skb->priority = 3; /* VI -> BE */
 163                 return 0;
 164         case 0:
 165         case 3:
 166                 skb->priority = 2; /* BE -> BK */
 167                 return 0;
 168         default:
 169                 return -1;
 170         }
 171 }
 172
 173
 174 /* positive return value indicates which queue to use
 175  * negative return value indicates to drop the frame */
 176 static inline int classify80211(struct sk_buff *skb, struct Qdisc *qd)
 177 {
 178         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 179         struct ieee80211_tx_packet_data *pkt_data =
 180                 (struct ieee80211_tx_packet_data *) skb->cb;
 181         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 182         unsigned short fc = le16_to_cpu(hdr->frame_control);
 183         int qos;
 184         const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
 185
 186         /* see if frame is data or non data frame */
 187         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) {
 188                 /* management frames go on AC_VO queue, but are sent
 189                 * without QoS control fields */
 190                 return IEEE80211_TX_QUEUE_DATA0;
 191         }
 192
 193         if (unlikely(pkt_data->mgmt_iface)) {
 194                 /* Data frames from hostapd (mainly, EAPOL) use AC_VO
 195                 * and they will include QoS control fields if
 196                 * the target STA is using WME. */
 197                 skb->priority = 7;
 198                 return ieee802_1d_to_ac[skb->priority];
 199         }
 200
 201         /* is this a QoS frame? */
 202         qos = fc & IEEE80211_STYPE_QOS_DATA;
 203
 204         if (!qos) {
 205                 skb->priority = 0; /* required for correct WPA/11i MIC */
 206                 return ieee802_1d_to_ac[skb->priority];
 207         }
 208
 209         /* use the data classifier to determine what 802.1d tag the
 210         * data frame has */
 211         skb->priority = classify_1d(skb, qd);
 212
 213         /* incase we are a client verify acm is not set for this ac */
 214         while (unlikely(local->wmm_acm & BIT(skb->priority))) {
 215                 if (wme_downgrade_ac(skb)) {
 216                         /* No AC with lower priority has acm=0,
 217                         * drop packet. */
 218                         return -1;
 219                 }
 220         }
 221
 222         /* look up which queue to use for frames with this 1d tag */
 223         return ieee802_1d_to_ac[skb->priority];
 224 }
 225
 226
 227 static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
 228 {
 229         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 230         struct ieee80211_sched_data *q = qdisc_priv(qd);
 231         struct ieee80211_tx_packet_data *pkt_data =
 232                 (struct ieee80211_tx_packet_data *) skb->cb;
 233         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 234         unsigned short fc = le16_to_cpu(hdr->frame_control);
 235         struct Qdisc *qdisc;
 236         int err, queue;
 237
 238         if (pkt_data->requeue) {
 239                 skb_queue_tail(&q->requeued[pkt_data->queue], skb);
 240                 return 0;
 241         }
 242
 243         queue = classify80211(skb, qd);
 244
 245         /* now we know the 1d priority, fill in the QoS header if there is one
 246          */
 247         if (WLAN_FC_IS_QOS_DATA(fc)) {
 248                 u8 *p = skb->data + ieee80211_get_hdrlen(fc) - 2;
 249                 u8 qos_hdr = skb->priority & QOS_CONTROL_TAG1D_MASK;
 250                 if (local->wifi_wme_noack_test)
 251                         qos_hdr |= QOS_CONTROL_ACK_POLICY_NOACK <<
 252                                         QOS_CONTROL_ACK_POLICY_SHIFT;
 253                 /* qos header is 2 bytes, second reserved */
 254                 *p = qos_hdr;
 255                 p++;
 256                 *p = 0;
 257         }
 258
 259         if (unlikely(queue >= local->hw.queues)) {
 260 #if 0
 261                 if (net_ratelimit()) {
 262                         printk(KERN_DEBUG "%s - queue=%d (hw does not "
 263                                "support) -> %d\n",
 264                                __func__, queue, local->hw.queues - 1);
 265                 }
 266 #endif
 267                 queue = local->hw.queues - 1;
 268         }
 269
 270         if (unlikely(queue < 0)) {
 271                         kfree_skb(skb);
 272                         err = NET_XMIT_DROP;
 273         } else {
 274                 pkt_data->queue = (unsigned int) queue;
 275                 qdisc = q->queues[queue];
 276                 err = qdisc->enqueue(skb, qdisc);
 277                 if (err == NET_XMIT_SUCCESS) {
 278                         qd->q.qlen++;
 279                         qd->bstats.bytes += skb->len;
 280                         qd->bstats.packets++;
 281                         return NET_XMIT_SUCCESS;
 282                 }
 283         }
 284         qd->qstats.drops++;
 285         return err;
 286 }
 287
 288
 289 /* TODO: clean up the cases where master_hard_start_xmit
 290  * returns non 0 - it shouldn't ever do that. Once done we
 291  * can remove this function */
 292 static int wme_qdiscop_requeue(struct sk_buff *skb, struct Qdisc* qd)
 293 {
 294         struct ieee80211_sched_data *q = qdisc_priv(qd);
 295         struct ieee80211_tx_packet_data *pkt_data =
 296                 (struct ieee80211_tx_packet_data *) skb->cb;
 297         struct Qdisc *qdisc;
 298         int err;
 299
 300         /* we recorded which queue to use earlier! */
 301         qdisc = q->queues[pkt_data->queue];
 302
 303         if ((err = qdisc->ops->requeue(skb, qdisc)) == 0) {
 304                 qd->q.qlen++;
 305                 return 0;
 306         }
 307         qd->qstats.drops++;
 308         return err;
 309 }
 310
 311
 312 static struct sk_buff *wme_qdiscop_dequeue(struct Qdisc* qd)
 313 {
 314         struct ieee80211_sched_data *q = qdisc_priv(qd);
 315         struct net_device *dev = qd->dev;
 316         struct ieee80211_local *local = dev->ieee80211_ptr;
 317         struct ieee80211_hw *hw = &local->hw;
 318         struct sk_buff *skb;
 319         struct Qdisc *qdisc;
 320         int queue;
 321
 322         /* check all the h/w queues in numeric/priority order */
 323         for (queue = 0; queue < hw->queues; queue++) {
 324                 /* see if there is room in this hardware queue */
 325                 if (test_bit(IEEE80211_LINK_STATE_XOFF,
 326                              &local->state[queue]) ||
 327                     test_bit(IEEE80211_LINK_STATE_PENDING,
 328                              &local->state[queue]))
 329                         continue;
 330
 331                 /* there is space - try and get a frame */
 332                 skb = skb_dequeue(&q->requeued[queue]);
 333                 if (skb)
 334                         return skb;
 335
 336                 qdisc = q->queues[queue];
 337                 skb = qdisc->dequeue(qdisc);
 338                 if (skb) {
 339                         qd->q.qlen--;
 340                         return skb;
 341                 }
 342         }
 343         /* returning a NULL here when all the h/w queues are full means we
 344          * never need to call netif_stop_queue in the driver */
 345         return NULL;
 346 }
 347
 348
 349 static void wme_qdiscop_reset(struct Qdisc* qd)
 350 {
 351         struct ieee80211_sched_data *q = qdisc_priv(qd);
 352         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 353         struct ieee80211_hw *hw = &local->hw;
 354         int queue;
 355
 356         /* QUESTION: should we have some hardware flush functionality here? */
 357
 358         for (queue = 0; queue < hw->queues; queue++) {
 359                 skb_queue_purge(&q->requeued[queue]);
 360                 qdisc_reset(q->queues[queue]);
 361         }
 362         qd->q.qlen = 0;
 363 }
 364
 365
 366 static void wme_qdiscop_destroy(struct Qdisc* qd)
 367 {
 368         struct ieee80211_sched_data *q = qdisc_priv(qd);
 369         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 370         struct ieee80211_hw *hw = &local->hw;
 371         struct tcf_proto *tp;
 372         int queue;
 373
 374         while ((tp = q->filter_list) != NULL) {
 375                 q->filter_list = tp->next;
 376                 tp->ops->destroy(tp);
 377         }
 378
 379         for (queue=0; queue < hw->queues; queue++) {
 380                 skb_queue_purge(&q->requeued[queue]);
 381                 qdisc_destroy(q->queues[queue]);
 382                 q->queues[queue] = &noop_qdisc;
 383         }
 384 }
 385
 386
 387 /* called whenever parameters are updated on existing qdisc */
 388 static int wme_qdiscop_tune(struct Qdisc *qd, struct rtattr *opt)
 389 {
 390 /*      struct ieee80211_sched_data *q = qdisc_priv(qd);
 391 */
 392         /* check our options block is the right size */
 393         /* copy any options to our local structure */
 394 /*      Ignore options block for now - always use static mapping
 395         struct tc_ieee80211_qopt *qopt = RTA_DATA(opt);
 396
 397         if (opt->rta_len < RTA_LENGTH(sizeof(*qopt)))
 398                 return -EINVAL;
 399         memcpy(q->tag2queue, qopt->tag2queue, sizeof(qopt->tag2queue));
 400 */
 401         return 0;
 402 }
 403
 404
 405 /* called during initial creation of qdisc on device */
 406 static int wme_qdiscop_init(struct Qdisc *qd, struct rtattr *opt)
 407 {
 408         struct ieee80211_sched_data *q = qdisc_priv(qd);
 409         struct net_device *dev = qd->dev;
 410         struct ieee80211_local *local = dev->ieee80211_ptr;
 411         int queues = local->hw.queues;
 412         int err = 0, i;
 413
 414         /* check this device is an ieee80211 master type device */
 415         if (dev->type != ARPHRD_IEEE80211)
 416                 return -EINVAL;
 417
 418         /* check that there is no qdisc currently attached to device
 419          * this ensures that we will be the root qdisc. (I can't find a better
 420          * way to test this explicitly) */
 421         if (dev->qdisc_sleeping != &noop_qdisc)
 422                 return -EINVAL;
 423
 424         if (qd->flags & TCQ_F_INGRESS)
 425                 return -EINVAL;
 426
 427         /* if options were passed in, set them */
 428         if (opt) {
 429                 err = wme_qdiscop_tune(qd, opt);
 430         }
 431
 432         /* create child queues */
 433         for (i = 0; i < queues; i++) {
 434                 skb_queue_head_init(&q->requeued[i]);
 435                 q->queues[i] = qdisc_create_dflt(qd->dev, &CHILD_QDISC_OPS);
 436                 if (q->queues[i] == 0) {
 437                         q->queues[i] = &noop_qdisc;
 438                         printk(KERN_ERR "%s child qdisc %i creation failed", dev->name, i);
 439                 }
 440         }
 441
 442         return err;
 443 }
 444
 445 static int wme_qdiscop_dump(struct Qdisc *qd, struct sk_buff *skb)
 446 {
 447 /*      struct ieee80211_sched_data *q = qdisc_priv(qd);
 448         unsigned char *p = skb->tail;
 449         struct tc_ieee80211_qopt opt;
 450
 451         memcpy(&opt.tag2queue, q->tag2queue, TC_80211_MAX_TAG + 1);
 452         RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
 453 */      return skb->len;
 454 /*
 455 rtattr_failure:
 456         skb_trim(skb, p - skb->data);*/
 457         return -1;
 458 }
 459
 460
 461 static int wme_classop_graft(struct Qdisc *qd, unsigned long arg,
 462                              struct Qdisc *new, struct Qdisc **old)
 463 {
 464         struct ieee80211_sched_data *q = qdisc_priv(qd);
 465         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 466         struct ieee80211_hw *hw = &local->hw;
 467         unsigned long queue = arg - 1;
 468
 469         if (queue >= hw->queues)
 470                 return -EINVAL;
 471
 472         if (!new)
 473                 new = &noop_qdisc;
 474
 475         sch_tree_lock(qd);
 476         *old = q->queues[queue];
 477         q->queues[queue] = new;
 478         qdisc_reset(*old);
 479         sch_tree_unlock(qd);
 480
 481         return 0;
 482 }
 483
 484
 485 static struct Qdisc *
 486 wme_classop_leaf(struct Qdisc *qd, unsigned long arg)
 487 {
 488         struct ieee80211_sched_data *q = qdisc_priv(qd);
 489         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 490         struct ieee80211_hw *hw = &local->hw;
 491         unsigned long queue = arg - 1;
 492
 493         if (queue >= hw->queues)
 494                 return NULL;
 495
 496         return q->queues[queue];
 497 }
 498
 499
 500 static unsigned long wme_classop_get(struct Qdisc *qd, u32 classid)
 501 {
 502         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 503         struct ieee80211_hw *hw = &local->hw;
 504         unsigned long queue = TC_H_MIN(classid);
 505
 506         if (queue - 1 >= hw->queues)
 507                 return 0;
 508
 509         return queue;
 510 }
 511
 512
 513 static unsigned long wme_classop_bind(struct Qdisc *qd, unsigned long parent,
 514                                       u32 classid)
 515 {
 516         return wme_classop_get(qd, classid);
 517 }
 518
 519
 520 static void wme_classop_put(struct Qdisc *q, unsigned long cl)
 521 {
 522         /* printk(KERN_DEBUG "entering %s\n", __func__); */
 523 }
 524
 525
 526 static int wme_classop_change(struct Qdisc *qd, u32 handle, u32 parent,
 527                               struct rtattr **tca, unsigned long *arg)
 528 {
 529         unsigned long cl = *arg;
 530         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 531         struct ieee80211_hw *hw = &local->hw;
 532         /* printk(KERN_DEBUG "entering %s\n", __func__); */
 533
 534         if (cl - 1 > hw->queues)
 535                 return -ENOENT;
 536
 537         /* TODO: put code to program hardware queue parameters here,
 538          * to allow programming from tc command line */
 539
 540         return 0;
 541 }
 542
 543
 544 /* we don't support deleting hardware queues
 545  * when we add WMM-SA support - TSPECs may be deleted here */
 546 static int wme_classop_delete(struct Qdisc *qd, unsigned long cl)
 547 {
 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         return 0;
 555 }
 556
 557
 558 static int wme_classop_dump_class(struct Qdisc *qd, unsigned long cl,
 559                                   struct sk_buff *skb, struct tcmsg *tcm)
 560 {
 561         struct ieee80211_sched_data *q = qdisc_priv(qd);
 562         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 563         struct ieee80211_hw *hw = &local->hw;
 564         /* printk(KERN_DEBUG "entering %s\n", __func__); */
 565
 566         if (cl - 1 > hw->queues)
 567                 return -ENOENT;
 568         tcm->tcm_handle = TC_H_MIN(cl);
 569         tcm->tcm_parent = qd->handle;
 570         tcm->tcm_info = q->queues[cl-1]->handle; /* do we need this? */
 571         return 0;
 572 }
 573
 574
 575 static void wme_classop_walk(struct Qdisc *qd, struct qdisc_walker *arg)
 576 {
 577         struct ieee80211_local *local = qd->dev->ieee80211_ptr;
 578         struct ieee80211_hw *hw = &local->hw;
 579         int queue;
 580         /* printk(KERN_DEBUG "entering %s\n", __func__); */
 581
 582         if (arg->stop)
 583                 return;
 584
 585         for (queue = 0; queue < hw->queues; queue++) {
 586                 if (arg->count < arg->skip) {
 587                         arg->count++;
 588                         continue;
 589                 }
 590                 /* we should return classids for our internal queues here
 591                  * as well as the external ones */
 592                 if (arg->fn(qd, queue+1, arg) < 0) {
 593                         arg->stop = 1;
 594                         break;
 595                 }
 596                 arg->count++;
 597         }
 598 }
 599
 600
 601 static struct tcf_proto ** wme_classop_find_tcf(struct Qdisc *qd,
 602                                                 unsigned long cl)
 603 {
 604         struct ieee80211_sched_data *q = qdisc_priv(qd);
 605         /* printk("entering %s\n", __func__); */
 606
 607         if (cl)
 608                 return NULL;
 609
 610         return &q->filter_list;
 611 }
 612
 613
 614 /* this qdisc is classful (i.e. has classes, some of which may have leaf qdiscs attached)
 615  * - these are the operations on the classes */
 616 static struct Qdisc_class_ops class_ops =
 617 {
 618         .graft = wme_classop_graft,
 619         .leaf = wme_classop_leaf,
 620
 621         .get = wme_classop_get,
 622         .put = wme_classop_put,
 623         .change = wme_classop_change,
 624         .delete = wme_classop_delete,
 625         .walk = wme_classop_walk,
 626
 627         .tcf_chain = wme_classop_find_tcf,
 628         .bind_tcf = wme_classop_bind,
 629         .unbind_tcf = wme_classop_put,
 630
 631         .dump = wme_classop_dump_class,
 632 };
 633
 634
 635 /* queueing discipline operations */
 636 static struct Qdisc_ops wme_qdisc_ops =
 637 {
 638         .next = NULL,
 639         .cl_ops = &class_ops,
 640         .id = "ieee80211",
 641         .priv_size = sizeof(struct ieee80211_sched_data),
 642
 643         .enqueue = wme_qdiscop_enqueue,
 644         .dequeue = wme_qdiscop_dequeue,
 645         .requeue = wme_qdiscop_requeue,
 646         .drop = NULL, /* drop not needed since we are always the root qdisc */
 647
 648         .init = wme_qdiscop_init,
 649         .reset = wme_qdiscop_reset,
 650         .destroy = wme_qdiscop_destroy,
 651         .change = wme_qdiscop_tune,
 652
 653         .dump = wme_qdiscop_dump,
 654 };
 655
 656
 657 void ieee80211_install_qdisc(struct net_device *dev)
 658 {
 659         struct Qdisc *qdisc;
 660
 661         qdisc = qdisc_create_dflt(dev, &wme_qdisc_ops);
 662         if (!qdisc) {
 663                 printk(KERN_ERR "%s: qdisc installation failed\n", dev->name);
 664                 return;
 665         }
 666
 667         /* same handle as would be allocated by qdisc_alloc_handle() */
 668         qdisc->handle = 0x80010000;
 669
 670         qdisc_lock_tree(dev);
 671         list_add_tail(&qdisc->list, &dev->qdisc_list);
 672         dev->qdisc_sleeping = qdisc;
 673         qdisc_unlock_tree(dev);
 674 }
 675
 676
 677 int ieee80211_wme_register(void)
 678 {
 679         int err = 0;
 680
 681 #ifdef CONFIG_NET_SCHED
 682         err = register_qdisc(&wme_qdisc_ops);
 683 #endif
 684         return err;
 685 }
 686
 687
 688 void ieee80211_wme_unregister(void)
 689 {
 690 #ifdef CONFIG_NET_SCHED
 691         unregister_qdisc(&wme_qdisc_ops);
 692 #endif
 693 }