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 /* maximum number of hardware queues we support. */
  22 #define QD_MAX_QUEUES (IEEE80211_MAX_AMPDU_QUEUES + IEEE80211_MAX_QUEUES)
  23 /* current number of hardware queues we support. */
  24 #define QD_NUM(hw) ((hw)->queues + (hw)->ampdu_queues)
  25
  26 /*
  27  * Default mapping in classifier to work with default
  28  * queue setup.
  29  */
  30 const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
  31
  32 struct ieee80211_sched_data
  33 {
  34         unsigned long qdisc_pool[BITS_TO_LONGS(QD_MAX_QUEUES)];
  35         struct tcf_proto *filter_list;
  36         struct Qdisc *queues[QD_MAX_QUEUES];
  37         struct sk_buff_head requeued[QD_MAX_QUEUES];
  38 };
  39
  40 static const char llc_ip_hdr[8] = {0xAA, 0xAA, 0x3, 0, 0, 0, 0x08, 0};
  41
  42 /* given a data frame determine the 802.1p/1d tag to use */
  43 static inline unsigned classify_1d(struct sk_buff *skb, struct Qdisc *qd)
  44 {
  45         struct iphdr *ip;
  46         int dscp;
  47         int offset;
  48
  49         struct ieee80211_sched_data *q = qdisc_priv(qd);
  50         struct tcf_result res = { -1, 0 };
  51
  52         /* if there is a user set filter list, call out to that */
  53         if (q->filter_list) {
  54                 tc_classify(skb, q->filter_list, &res);
  55                 if (res.class != -1)
  56                         return res.class;
  57         }
  58
  59         /* skb->priority values from 256->263 are magic values to
  60          * directly indicate a specific 802.1d priority.
  61          * This is used to allow 802.1d priority to be passed directly in
  62          * from VLAN tags, etc. */
  63         if (skb->priority >= 256 && skb->priority <= 263)
  64                 return skb->priority - 256;
  65
  66         /* check there is a valid IP header present */
  67         offset = ieee80211_get_hdrlen_from_skb(skb);
  68         if (skb->len < offset + sizeof(llc_ip_hdr) + sizeof(*ip) ||
  69             memcmp(skb->data + offset, llc_ip_hdr, sizeof(llc_ip_hdr)))
  70                 return 0;
  71
  72         ip = (struct iphdr *) (skb->data + offset + sizeof(llc_ip_hdr));
  73
  74         dscp = ip->tos & 0xfc;
  75         if (dscp & 0x1c)
  76                 return 0;
  77         return dscp >> 5;
  78 }
  79
  80
  81 static inline int wme_downgrade_ac(struct sk_buff *skb)
  82 {
  83         switch (skb->priority) {
  84         case 6:
  85         case 7:
  86                 skb->priority = 5; /* VO -> VI */
  87                 return 0;
  88         case 4:
  89         case 5:
  90                 skb->priority = 3; /* VI -> BE */
  91                 return 0;
  92         case 0:
  93         case 3:
  94                 skb->priority = 2; /* BE -> BK */
  95                 return 0;
  96         default:
  97                 return -1;
  98         }
  99 }
 100
 101
 102 /* positive return value indicates which queue to use
 103  * negative return value indicates to drop the frame */
 104 static int classify80211(struct sk_buff *skb, struct Qdisc *qd)
 105 {
 106         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 107         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 108         unsigned short fc = le16_to_cpu(hdr->frame_control);
 109         int qos;
 110
 111         /* see if frame is data or non data frame */
 112         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) {
 113                 /* management frames go on AC_VO queue, but are sent
 114                 * without QoS control fields */
 115                 return 0;
 116         }
 117
 118         if (0 /* injected */) {
 119                 /* use AC from radiotap */
 120         }
 121
 122         /* is this a QoS frame? */
 123         qos = fc & IEEE80211_STYPE_QOS_DATA;
 124
 125         if (!qos) {
 126                 skb->priority = 0; /* required for correct WPA/11i MIC */
 127                 return ieee802_1d_to_ac[skb->priority];
 128         }
 129
 130         /* use the data classifier to determine what 802.1d tag the
 131          * data frame has */
 132         skb->priority = classify_1d(skb, qd);
 133
 134         /* in case we are a client verify acm is not set for this ac */
 135         while (unlikely(local->wmm_acm & BIT(skb->priority))) {
 136                 if (wme_downgrade_ac(skb)) {
 137                         /* No AC with lower priority has acm=0, drop packet. */
 138                         return -1;
 139                 }
 140         }
 141
 142         /* look up which queue to use for frames with this 1d tag */
 143         return ieee802_1d_to_ac[skb->priority];
 144 }
 145
 146
 147 static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
 148 {
 149         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 150         struct ieee80211_hw *hw = &local->hw;
 151         struct ieee80211_sched_data *q = qdisc_priv(qd);
 152         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 153         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 154         unsigned short fc = le16_to_cpu(hdr->frame_control);
 155         struct Qdisc *qdisc;
 156         struct sta_info *sta;
 157         int err, queue;
 158         u8 tid;
 159
 160         if (info->flags & IEEE80211_TX_CTL_REQUEUE) {
 161                 queue = skb_get_queue_mapping(skb);
 162                 rcu_read_lock();
 163                 sta = sta_info_get(local, hdr->addr1);
 164                 tid = skb->priority & QOS_CONTROL_TAG1D_MASK;
 165                 if (sta) {
 166                         int ampdu_queue = sta->tid_to_tx_q[tid];
 167                         if ((ampdu_queue < QD_NUM(hw)) &&
 168                             test_bit(ampdu_queue, q->qdisc_pool)) {
 169                                 queue = ampdu_queue;
 170                                 info->flags |= IEEE80211_TX_CTL_AMPDU;
 171                         } else {
 172                                 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
 173                         }
 174                 }
 175                 rcu_read_unlock();
 176                 skb_queue_tail(&q->requeued[queue], skb);
 177                 qd->q.qlen++;
 178                 return 0;
 179         }
 180
 181         queue = classify80211(skb, qd);
 182
 183         if (unlikely(queue >= local->hw.queues))
 184                 queue = local->hw.queues - 1;
 185
 186         /* now we know the 1d priority, fill in the QoS header if there is one
 187          */
 188         if (WLAN_FC_IS_QOS_DATA(fc)) {
 189                 u8 *p = skb->data + ieee80211_get_hdrlen(fc) - 2;
 190                 u8 ack_policy = 0;
 191                 tid = skb->priority & QOS_CONTROL_TAG1D_MASK;
 192                 if (local->wifi_wme_noack_test)
 193                         ack_policy |= QOS_CONTROL_ACK_POLICY_NOACK <<
 194                                         QOS_CONTROL_ACK_POLICY_SHIFT;
 195                 /* qos header is 2 bytes, second reserved */
 196                 *p = ack_policy | tid;
 197                 p++;
 198                 *p = 0;
 199
 200                 rcu_read_lock();
 201
 202                 sta = sta_info_get(local, hdr->addr1);
 203                 if (sta) {
 204                         int ampdu_queue = sta->tid_to_tx_q[tid];
 205                         if ((ampdu_queue < QD_NUM(hw)) &&
 206                             test_bit(ampdu_queue, q->qdisc_pool)) {
 207                                 queue = ampdu_queue;
 208                                 info->flags |= IEEE80211_TX_CTL_AMPDU;
 209                         } else {
 210                                 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
 211                         }
 212                 }
 213
 214                 rcu_read_unlock();
 215         }
 216
 217         if (unlikely(queue < 0)) {
 218                         kfree_skb(skb);
 219                         err = NET_XMIT_DROP;
 220         } else {
 221                 tid = skb->priority & QOS_CONTROL_TAG1D_MASK;
 222                 skb_set_queue_mapping(skb, queue);
 223                 qdisc = q->queues[queue];
 224                 err = qdisc->enqueue(skb, qdisc);
 225                 if (err == NET_XMIT_SUCCESS) {
 226                         qd->q.qlen++;
 227                         qd->bstats.bytes += skb->len;
 228                         qd->bstats.packets++;
 229                         return NET_XMIT_SUCCESS;
 230                 }
 231         }
 232         qd->qstats.drops++;
 233         return err;
 234 }
 235
 236
 237 /* TODO: clean up the cases where master_hard_start_xmit
 238  * returns non 0 - it shouldn't ever do that. Once done we
 239  * can remove this function */
 240 static int wme_qdiscop_requeue(struct sk_buff *skb, struct Qdisc* qd)
 241 {
 242         struct ieee80211_sched_data *q = qdisc_priv(qd);
 243         struct Qdisc *qdisc;
 244         int err;
 245
 246         /* we recorded which queue to use earlier! */
 247         qdisc = q->queues[skb_get_queue_mapping(skb)];
 248
 249         if ((err = qdisc->ops->requeue(skb, qdisc)) == 0) {
 250                 qd->q.qlen++;
 251                 return 0;
 252         }
 253         qd->qstats.drops++;
 254         return err;
 255 }
 256
 257
 258 static struct sk_buff *wme_qdiscop_dequeue(struct Qdisc* qd)
 259 {
 260         struct ieee80211_sched_data *q = qdisc_priv(qd);
 261         struct net_device *dev = qd->dev;
 262         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 263         struct ieee80211_hw *hw = &local->hw;
 264         struct sk_buff *skb;
 265         struct Qdisc *qdisc;
 266         int queue;
 267
 268         /* check all the h/w queues in numeric/priority order */
 269         for (queue = 0; queue < QD_NUM(hw); queue++) {
 270                 /* see if there is room in this hardware queue */
 271                 if (__netif_subqueue_stopped(local->mdev, queue) ||
 272                     !test_bit(queue, q->qdisc_pool))
 273                         continue;
 274
 275                 /* there is space - try and get a frame */
 276                 skb = skb_dequeue(&q->requeued[queue]);
 277                 if (skb) {
 278                         qd->q.qlen--;
 279                         return skb;
 280                 }
 281
 282                 qdisc = q->queues[queue];
 283                 skb = qdisc->dequeue(qdisc);
 284                 if (skb) {
 285                         qd->q.qlen--;
 286                         return skb;
 287                 }
 288         }
 289         /* returning a NULL here when all the h/w queues are full means we
 290          * never need to call netif_stop_queue in the driver */
 291         return NULL;
 292 }
 293
 294
 295 static void wme_qdiscop_reset(struct Qdisc* qd)
 296 {
 297         struct ieee80211_sched_data *q = qdisc_priv(qd);
 298         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 299         struct ieee80211_hw *hw = &local->hw;
 300         int queue;
 301
 302         /* QUESTION: should we have some hardware flush functionality here? */
 303
 304         for (queue = 0; queue < QD_NUM(hw); queue++) {
 305                 skb_queue_purge(&q->requeued[queue]);
 306                 qdisc_reset(q->queues[queue]);
 307         }
 308         qd->q.qlen = 0;
 309 }
 310
 311
 312 static void wme_qdiscop_destroy(struct Qdisc* qd)
 313 {
 314         struct ieee80211_sched_data *q = qdisc_priv(qd);
 315         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 316         struct ieee80211_hw *hw = &local->hw;
 317         int queue;
 318
 319         tcf_destroy_chain(q->filter_list);
 320         q->filter_list = NULL;
 321
 322         for (queue = 0; queue < QD_NUM(hw); queue++) {
 323                 skb_queue_purge(&q->requeued[queue]);
 324                 qdisc_destroy(q->queues[queue]);
 325                 q->queues[queue] = &noop_qdisc;
 326         }
 327 }
 328
 329
 330 /* called whenever parameters are updated on existing qdisc */
 331 static int wme_qdiscop_tune(struct Qdisc *qd, struct nlattr *opt)
 332 {
 333         return 0;
 334 }
 335
 336
 337 /* called during initial creation of qdisc on device */
 338 static int wme_qdiscop_init(struct Qdisc *qd, struct nlattr *opt)
 339 {
 340         struct ieee80211_sched_data *q = qdisc_priv(qd);
 341         struct net_device *dev = qd->dev;
 342         struct ieee80211_local *local;
 343         struct ieee80211_hw *hw;
 344         int err = 0, i;
 345
 346         /* check that device is a mac80211 device */
 347         if (!dev->ieee80211_ptr ||
 348             dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
 349                 return -EINVAL;
 350
 351         local = wdev_priv(dev->ieee80211_ptr);
 352         hw = &local->hw;
 353
 354         /* only allow on master dev */
 355         if (dev != local->mdev)
 356                 return -EINVAL;
 357
 358         /* ensure that we are root qdisc */
 359         if (qd->parent != TC_H_ROOT)
 360                 return -EINVAL;
 361
 362         if (qd->flags & TCQ_F_INGRESS)
 363                 return -EINVAL;
 364
 365         /* if options were passed in, set them */
 366         if (opt)
 367                 err = wme_qdiscop_tune(qd, opt);
 368
 369         /* create child queues */
 370         for (i = 0; i < QD_NUM(hw); i++) {
 371                 skb_queue_head_init(&q->requeued[i]);
 372                 q->queues[i] = qdisc_create_dflt(qd->dev, &pfifo_qdisc_ops,
 373                                                  qd->handle);
 374                 if (!q->queues[i]) {
 375                         q->queues[i] = &noop_qdisc;
 376                         printk(KERN_ERR "%s child qdisc %i creation failed\n",
 377                                dev->name, i);
 378                 }
 379         }
 380
 381         /* non-aggregation queues: reserve/mark as used */
 382         for (i = 0; i < local->hw.queues; i++)
 383                 set_bit(i, q->qdisc_pool);
 384
 385         return err;
 386 }
 387
 388 static int wme_qdiscop_dump(struct Qdisc *qd, struct sk_buff *skb)
 389 {
 390         return -1;
 391 }
 392
 393
 394 static int wme_classop_graft(struct Qdisc *qd, unsigned long arg,
 395                              struct Qdisc *new, struct Qdisc **old)
 396 {
 397         struct ieee80211_sched_data *q = qdisc_priv(qd);
 398         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 399         struct ieee80211_hw *hw = &local->hw;
 400         unsigned long queue = arg - 1;
 401
 402         if (queue >= QD_NUM(hw))
 403                 return -EINVAL;
 404
 405         if (!new)
 406                 new = &noop_qdisc;
 407
 408         sch_tree_lock(qd);
 409         *old = q->queues[queue];
 410         q->queues[queue] = new;
 411         qdisc_reset(*old);
 412         sch_tree_unlock(qd);
 413
 414         return 0;
 415 }
 416
 417
 418 static struct Qdisc *
 419 wme_classop_leaf(struct Qdisc *qd, unsigned long arg)
 420 {
 421         struct ieee80211_sched_data *q = qdisc_priv(qd);
 422         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 423         struct ieee80211_hw *hw = &local->hw;
 424         unsigned long queue = arg - 1;
 425
 426         if (queue >= QD_NUM(hw))
 427                 return NULL;
 428
 429         return q->queues[queue];
 430 }
 431
 432
 433 static unsigned long wme_classop_get(struct Qdisc *qd, u32 classid)
 434 {
 435         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 436         struct ieee80211_hw *hw = &local->hw;
 437         unsigned long queue = TC_H_MIN(classid);
 438
 439         if (queue - 1 >= QD_NUM(hw))
 440                 return 0;
 441
 442         return queue;
 443 }
 444
 445
 446 static unsigned long wme_classop_bind(struct Qdisc *qd, unsigned long parent,
 447                                       u32 classid)
 448 {
 449         return wme_classop_get(qd, classid);
 450 }
 451
 452
 453 static void wme_classop_put(struct Qdisc *q, unsigned long cl)
 454 {
 455 }
 456
 457
 458 static int wme_classop_change(struct Qdisc *qd, u32 handle, u32 parent,
 459                               struct nlattr **tca, unsigned long *arg)
 460 {
 461         unsigned long cl = *arg;
 462         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 463         struct ieee80211_hw *hw = &local->hw;
 464
 465         if (cl - 1 > QD_NUM(hw))
 466                 return -ENOENT;
 467
 468         /* TODO: put code to program hardware queue parameters here,
 469          * to allow programming from tc command line */
 470
 471         return 0;
 472 }
 473
 474
 475 /* we don't support deleting hardware queues
 476  * when we add WMM-SA support - TSPECs may be deleted here */
 477 static int wme_classop_delete(struct Qdisc *qd, unsigned long cl)
 478 {
 479         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 480         struct ieee80211_hw *hw = &local->hw;
 481
 482         if (cl - 1 > QD_NUM(hw))
 483                 return -ENOENT;
 484         return 0;
 485 }
 486
 487
 488 static int wme_classop_dump_class(struct Qdisc *qd, unsigned long cl,
 489                                   struct sk_buff *skb, struct tcmsg *tcm)
 490 {
 491         struct ieee80211_sched_data *q = qdisc_priv(qd);
 492         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 493         struct ieee80211_hw *hw = &local->hw;
 494
 495         if (cl - 1 > QD_NUM(hw))
 496                 return -ENOENT;
 497         tcm->tcm_handle = TC_H_MIN(cl);
 498         tcm->tcm_parent = qd->handle;
 499         tcm->tcm_info = q->queues[cl-1]->handle; /* do we need this? */
 500         return 0;
 501 }
 502
 503
 504 static void wme_classop_walk(struct Qdisc *qd, struct qdisc_walker *arg)
 505 {
 506         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 507         struct ieee80211_hw *hw = &local->hw;
 508         int queue;
 509
 510         if (arg->stop)
 511                 return;
 512
 513         for (queue = 0; queue < QD_NUM(hw); queue++) {
 514                 if (arg->count < arg->skip) {
 515                         arg->count++;
 516                         continue;
 517                 }
 518                 /* we should return classids for our internal queues here
 519                  * as well as the external ones */
 520                 if (arg->fn(qd, queue+1, arg) < 0) {
 521                         arg->stop = 1;
 522                         break;
 523                 }
 524                 arg->count++;
 525         }
 526 }
 527
 528
 529 static struct tcf_proto ** wme_classop_find_tcf(struct Qdisc *qd,
 530                                                 unsigned long cl)
 531 {
 532         struct ieee80211_sched_data *q = qdisc_priv(qd);
 533
 534         if (cl)
 535                 return NULL;
 536
 537         return &q->filter_list;
 538 }
 539
 540
 541 /* this qdisc is classful (i.e. has classes, some of which may have leaf qdiscs attached)
 542  * - these are the operations on the classes */
 543 static const struct Qdisc_class_ops class_ops =
 544 {
 545         .graft = wme_classop_graft,
 546         .leaf = wme_classop_leaf,
 547
 548         .get = wme_classop_get,
 549         .put = wme_classop_put,
 550         .change = wme_classop_change,
 551         .delete = wme_classop_delete,
 552         .walk = wme_classop_walk,
 553
 554         .tcf_chain = wme_classop_find_tcf,
 555         .bind_tcf = wme_classop_bind,
 556         .unbind_tcf = wme_classop_put,
 557
 558         .dump = wme_classop_dump_class,
 559 };
 560
 561
 562 /* queueing discipline operations */
 563 static struct Qdisc_ops wme_qdisc_ops __read_mostly =
 564 {
 565         .next = NULL,
 566         .cl_ops = &class_ops,
 567         .id = "ieee80211",
 568         .priv_size = sizeof(struct ieee80211_sched_data),
 569
 570         .enqueue = wme_qdiscop_enqueue,
 571         .dequeue = wme_qdiscop_dequeue,
 572         .requeue = wme_qdiscop_requeue,
 573         .drop = NULL, /* drop not needed since we are always the root qdisc */
 574
 575         .init = wme_qdiscop_init,
 576         .reset = wme_qdiscop_reset,
 577         .destroy = wme_qdiscop_destroy,
 578         .change = wme_qdiscop_tune,
 579
 580         .dump = wme_qdiscop_dump,
 581 };
 582
 583
 584 void ieee80211_install_qdisc(struct net_device *dev)
 585 {
 586         struct Qdisc *qdisc;
 587
 588         qdisc = qdisc_create_dflt(dev, &wme_qdisc_ops, TC_H_ROOT);
 589         if (!qdisc) {
 590                 printk(KERN_ERR "%s: qdisc installation failed\n", dev->name);
 591                 return;
 592         }
 593
 594         /* same handle as would be allocated by qdisc_alloc_handle() */
 595         qdisc->handle = 0x80010000;
 596
 597         qdisc_lock_tree(dev);
 598         list_add_tail(&qdisc->list, &dev->qdisc_list);
 599         dev->qdisc_sleeping = qdisc;
 600         qdisc_unlock_tree(dev);
 601 }
 602
 603
 604 int ieee80211_qdisc_installed(struct net_device *dev)
 605 {
 606         return dev->qdisc_sleeping->ops == &wme_qdisc_ops;
 607 }
 608
 609
 610 int ieee80211_wme_register(void)
 611 {
 612         return register_qdisc(&wme_qdisc_ops);
 613 }
 614
 615
 616 void ieee80211_wme_unregister(void)
 617 {
 618         unregister_qdisc(&wme_qdisc_ops);
 619 }
 620
 621 int ieee80211_ht_agg_queue_add(struct ieee80211_local *local,
 622                         struct sta_info *sta, u16 tid)
 623 {
 624         int i;
 625         struct ieee80211_sched_data *q =
 626                         qdisc_priv(local->mdev->qdisc_sleeping);
 627         DECLARE_MAC_BUF(mac);
 628
 629         /* prepare the filter and save it for the SW queue
 630          * matching the received HW queue */
 631
 632         if (!local->hw.ampdu_queues)
 633                 return -EPERM;
 634
 635         /* try to get a Qdisc from the pool */
 636         for (i = local->hw.queues; i < QD_NUM(&local->hw); i++)
 637                 if (!test_and_set_bit(i, q->qdisc_pool)) {
 638                         ieee80211_stop_queue(local_to_hw(local), i);
 639                         sta->tid_to_tx_q[tid] = i;
 640
 641                         /* IF there are already pending packets
 642                          * on this tid first we need to drain them
 643                          * on the previous queue
 644                          * since HT is strict in order */
 645 #ifdef CONFIG_MAC80211_HT_DEBUG
 646                         if (net_ratelimit())
 647                                 printk(KERN_DEBUG "allocated aggregation queue"
 648                                         " %d tid %d addr %s pool=0x%lX",
 649                                         i, tid, print_mac(mac, sta->addr),
 650                                         q->qdisc_pool[0]);
 651 #endif /* CONFIG_MAC80211_HT_DEBUG */
 652                         return 0;
 653                 }
 654
 655         return -EAGAIN;
 656 }
 657
 658 /**
 659  * the caller needs to hold local->mdev->queue_lock
 660  */
 661 void ieee80211_ht_agg_queue_remove(struct ieee80211_local *local,
 662                                    struct sta_info *sta, u16 tid,
 663                                    u8 requeue)
 664 {
 665         struct ieee80211_hw *hw = &local->hw;
 666         struct ieee80211_sched_data *q =
 667                 qdisc_priv(local->mdev->qdisc_sleeping);
 668         int agg_queue = sta->tid_to_tx_q[tid];
 669
 670         /* return the qdisc to the pool */
 671         clear_bit(agg_queue, q->qdisc_pool);
 672         sta->tid_to_tx_q[tid] = QD_NUM(hw);
 673
 674         if (requeue)
 675                 ieee80211_requeue(local, agg_queue);
 676         else
 677                 q->queues[agg_queue]->ops->reset(q->queues[agg_queue]);
 678 }
 679
 680 void ieee80211_requeue(struct ieee80211_local *local, int queue)
 681 {
 682         struct Qdisc *root_qd = local->mdev->qdisc_sleeping;
 683         struct ieee80211_sched_data *q = qdisc_priv(root_qd);
 684         struct Qdisc *qdisc = q->queues[queue];
 685         struct sk_buff *skb = NULL;
 686         u32 len;
 687
 688         if (!qdisc || !qdisc->dequeue)
 689                 return;
 690
 691         printk(KERN_DEBUG "requeue: qlen = %d\n", qdisc->q.qlen);
 692         for (len = qdisc->q.qlen; len > 0; len--) {
 693                 skb = qdisc->dequeue(qdisc);
 694                 root_qd->q.qlen--;
 695                 /* packet will be classified again and */
 696                 /* skb->packet_data->queue will be overridden if needed */
 697                 if (skb)
 698                         wme_qdiscop_enqueue(skb, root_qd);
 699         }
 700 }