package/mac80211/src/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 TC_80211_MAX_QUEUES 16
  23
  24 const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
  25
  26 struct ieee80211_sched_data
  27 {
  28         unsigned long qdisc_pool;
  29         struct tcf_proto *filter_list;
  30         struct Qdisc *queues[TC_80211_MAX_QUEUES];
  31         struct sk_buff_head requeued[TC_80211_MAX_QUEUES];
  32 };
  33
  34 static const char llc_ip_hdr[8] = {0xAA, 0xAA, 0x3, 0, 0, 0, 0x08, 0};
  35
  36 /* given a data frame determine the 802.1p/1d tag to use */
  37 static inline unsigned classify_1d(struct sk_buff *skb, struct Qdisc *qd)
  38 {
  39         struct iphdr *ip;
  40         int dscp;
  41         int offset;
  42
  43         struct ieee80211_sched_data *q = qdisc_priv(qd);
  44         struct tcf_result res = { -1, 0 };
  45
  46         /* if there is a user set filter list, call out to that */
  47         if (q->filter_list) {
  48                 tc_classify(skb, q->filter_list, &res);
  49                 if (res.class != -1)
  50                         return res.class;
  51         }
  52
  53         /* skb->priority values from 256->263 are magic values to
  54          * directly indicate a specific 802.1d priority.
  55          * This is used to allow 802.1d priority to be passed directly in
  56          * from VLAN tags, etc. */
  57         if (skb->priority >= 256 && skb->priority <= 263)
  58                 return skb->priority - 256;
  59
  60         /* check there is a valid IP header present */
  61         offset = ieee80211_get_hdrlen_from_skb(skb);
  62         if (skb->len < offset + sizeof(llc_ip_hdr) + sizeof(*ip) ||
  63             memcmp(skb->data + offset, llc_ip_hdr, sizeof(llc_ip_hdr)))
  64                 return 0;
  65
  66         ip = (struct iphdr *) (skb->data + offset + sizeof(llc_ip_hdr));
  67
  68         dscp = ip->tos & 0xfc;
  69         if (dscp & 0x1c)
  70                 return 0;
  71         return dscp >> 5;
  72 }
  73
  74
  75 static inline int wme_downgrade_ac(struct sk_buff *skb)
  76 {
  77         switch (skb->priority) {
  78         case 6:
  79         case 7:
  80                 skb->priority = 5; /* VO -> VI */
  81                 return 0;
  82         case 4:
  83         case 5:
  84                 skb->priority = 3; /* VI -> BE */
  85                 return 0;
  86         case 0:
  87         case 3:
  88                 skb->priority = 2; /* BE -> BK */
  89                 return 0;
  90         default:
  91                 return -1;
  92         }
  93 }
  94
  95
  96 /* positive return value indicates which queue to use
  97  * negative return value indicates to drop the frame */
  98 static inline int classify80211(struct sk_buff *skb, struct Qdisc *qd)
  99 {
 100         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 101         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 102         unsigned short fc = le16_to_cpu(hdr->frame_control);
 103         int qos;
 104
 105         /* see if frame is data or non data frame */
 106         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) {
 107                 /* management frames go on AC_VO queue, but are sent
 108                 * without QoS control fields */
 109                 return IEEE80211_TX_QUEUE_DATA0;
 110         }
 111
 112         if (0 /* injected */) {
 113                 /* use AC from radiotap */
 114         }
 115
 116         /* is this a QoS frame? */
 117         qos = fc & IEEE80211_STYPE_QOS_DATA;
 118
 119         if (!qos) {
 120                 skb->priority = 0; /* required for correct WPA/11i MIC */
 121                 return ieee802_1d_to_ac[skb->priority];
 122         }
 123
 124         /* use the data classifier to determine what 802.1d tag the
 125          * data frame has */
 126         skb->priority = classify_1d(skb, qd);
 127
 128         /* in case we are a client verify acm is not set for this ac */
 129         while (unlikely(local->wmm_acm & BIT(skb->priority))) {
 130                 if (wme_downgrade_ac(skb)) {
 131                         /* No AC with lower priority has acm=0, drop packet. */
 132                         return -1;
 133                 }
 134         }
 135
 136         /* look up which queue to use for frames with this 1d tag */
 137         return ieee802_1d_to_ac[skb->priority];
 138 }
 139
 140
 141 static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
 142 {
 143         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 144         struct ieee80211_sched_data *q = qdisc_priv(qd);
 145         struct ieee80211_tx_packet_data *pkt_data =
 146                 (struct ieee80211_tx_packet_data *) skb->cb;
 147         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 148         unsigned short fc = le16_to_cpu(hdr->frame_control);
 149         struct Qdisc *qdisc;
 150         int err, queue;
 151         struct sta_info *sta;
 152         u8 tid;
 153
 154         if (pkt_data->flags & IEEE80211_TXPD_REQUEUE) {
 155                 queue = pkt_data->queue;
 156                 sta = sta_info_get(local, hdr->addr1);
 157                 tid = skb->priority & QOS_CONTROL_TAG1D_MASK;
 158                 if (sta) {
 159                         int ampdu_queue = sta->tid_to_tx_q[tid];
 160                         if ((ampdu_queue < local->hw.queues) &&
 161                             test_bit(ampdu_queue, &q->qdisc_pool)) {
 162                                 queue = ampdu_queue;
 163                                 pkt_data->flags |= IEEE80211_TXPD_AMPDU;
 164                         } else {
 165                                 pkt_data->flags &= ~IEEE80211_TXPD_AMPDU;
 166                         }
 167                         sta_info_put(sta);
 168                 }
 169                 skb_queue_tail(&q->requeued[queue], skb);
 170                 qd->q.qlen++;
 171                 return 0;
 172         }
 173
 174         queue = classify80211(skb, qd);
 175
 176         /* now we know the 1d priority, fill in the QoS header if there is one
 177          */
 178         if (WLAN_FC_IS_QOS_DATA(fc)) {
 179                 u8 *p = skb->data + ieee80211_get_hdrlen(fc) - 2;
 180                 u8 ack_policy = 0;
 181                 tid = skb->priority & QOS_CONTROL_TAG1D_MASK;
 182                 if (local->wifi_wme_noack_test)
 183                         ack_policy |= QOS_CONTROL_ACK_POLICY_NOACK <<
 184                                         QOS_CONTROL_ACK_POLICY_SHIFT;
 185                 /* qos header is 2 bytes, second reserved */
 186                 *p = ack_policy | tid;
 187                 p++;
 188                 *p = 0;
 189
 190                 sta = sta_info_get(local, hdr->addr1);
 191                 if (sta) {
 192                         int ampdu_queue = sta->tid_to_tx_q[tid];
 193                         if ((ampdu_queue < local->hw.queues) &&
 194                                 test_bit(ampdu_queue, &q->qdisc_pool)) {
 195                                 queue = ampdu_queue;
 196                                 pkt_data->flags |= IEEE80211_TXPD_AMPDU;
 197                         } else {
 198                                 pkt_data->flags &= ~IEEE80211_TXPD_AMPDU;
 199                         }
 200                         sta_info_put(sta);
 201                 }
 202         }
 203
 204         if (unlikely(queue >= local->hw.queues)) {
 205 #if 0
 206                 if (net_ratelimit()) {
 207                         printk(KERN_DEBUG "%s - queue=%d (hw does not "
 208                                "support) -> %d\n",
 209                                __func__, queue, local->hw.queues - 1);
 210                 }
 211 #endif
 212                 queue = local->hw.queues - 1;
 213         }
 214
 215         if (unlikely(queue < 0)) {
 216                         kfree_skb(skb);
 217                         err = NET_XMIT_DROP;
 218         } else {
 219                 tid = skb->priority & QOS_CONTROL_TAG1D_MASK;
 220                 pkt_data->queue = (unsigned int) queue;
 221                 qdisc = q->queues[queue];
 222                 err = qdisc->enqueue(skb, qdisc);
 223                 if (err == NET_XMIT_SUCCESS) {
 224                         qd->q.qlen++;
 225                         qd->bstats.bytes += skb->len;
 226                         qd->bstats.packets++;
 227                         return NET_XMIT_SUCCESS;
 228                 }
 229         }
 230         qd->qstats.drops++;
 231         return err;
 232 }
 233
 234
 235 /* TODO: clean up the cases where master_hard_start_xmit
 236  * returns non 0 - it shouldn't ever do that. Once done we
 237  * can remove this function */
 238 static int wme_qdiscop_requeue(struct sk_buff *skb, struct Qdisc* qd)
 239 {
 240         struct ieee80211_sched_data *q = qdisc_priv(qd);
 241         struct ieee80211_tx_packet_data *pkt_data =
 242                 (struct ieee80211_tx_packet_data *) skb->cb;
 243         struct Qdisc *qdisc;
 244         int err;
 245
 246         /* we recorded which queue to use earlier! */
 247         qdisc = q->queues[pkt_data->queue];
 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 < hw->queues; queue++) {
 270                 /* see if there is room in this hardware queue */
 271                 if ((test_bit(IEEE80211_LINK_STATE_XOFF,
 272                                 &local->state[queue])) ||
 273                     (test_bit(IEEE80211_LINK_STATE_PENDING,
 274                                 &local->state[queue])) ||
 275                          (!test_bit(queue, &q->qdisc_pool)))
 276                         continue;
 277
 278                 /* there is space - try and get a frame */
 279                 skb = skb_dequeue(&q->requeued[queue]);
 280                 if (skb) {
 281                         qd->q.qlen--;
 282                         return skb;
 283                 }
 284
 285                 qdisc = q->queues[queue];
 286                 skb = qdisc->dequeue(qdisc);
 287                 if (skb) {
 288                         qd->q.qlen--;
 289                         return skb;
 290                 }
 291         }
 292         /* returning a NULL here when all the h/w queues are full means we
 293          * never need to call netif_stop_queue in the driver */
 294         return NULL;
 295 }
 296
 297
 298 static void wme_qdiscop_reset(struct Qdisc* qd)
 299 {
 300         struct ieee80211_sched_data *q = qdisc_priv(qd);
 301         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 302         struct ieee80211_hw *hw = &local->hw;
 303         int queue;
 304
 305         /* QUESTION: should we have some hardware flush functionality here? */
 306
 307         for (queue = 0; queue < hw->queues; queue++) {
 308                 skb_queue_purge(&q->requeued[queue]);
 309                 qdisc_reset(q->queues[queue]);
 310         }
 311         qd->q.qlen = 0;
 312 }
 313
 314
 315 static void wme_qdiscop_destroy(struct Qdisc* qd)
 316 {
 317         struct ieee80211_sched_data *q = qdisc_priv(qd);
 318         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 319         struct ieee80211_hw *hw = &local->hw;
 320         int queue;
 321
 322         tcf_destroy_chain(q->filter_list);
 323         q->filter_list = NULL;
 324
 325         for (queue=0; queue < hw->queues; queue++) {
 326                 skb_queue_purge(&q->requeued[queue]);
 327                 qdisc_destroy(q->queues[queue]);
 328                 q->queues[queue] = &noop_qdisc;
 329         }
 330 }
 331
 332
 333 /* called whenever parameters are updated on existing qdisc */
 334 static int wme_qdiscop_tune(struct Qdisc *qd, struct rtattr *opt)
 335 {
 336 /*      struct ieee80211_sched_data *q = qdisc_priv(qd);
 337 */
 338         /* check our options block is the right size */
 339         /* copy any options to our local structure */
 340 /*      Ignore options block for now - always use static mapping
 341         struct tc_ieee80211_qopt *qopt = RTA_DATA(opt);
 342
 343         if (opt->rta_len < RTA_LENGTH(sizeof(*qopt)))
 344                 return -EINVAL;
 345         memcpy(q->tag2queue, qopt->tag2queue, sizeof(qopt->tag2queue));
 346 */
 347         return 0;
 348 }
 349
 350
 351 /* called during initial creation of qdisc on device */
 352 static int wme_qdiscop_init(struct Qdisc *qd, struct rtattr *opt)
 353 {
 354         struct ieee80211_sched_data *q = qdisc_priv(qd);
 355         struct net_device *dev = qd->dev;
 356         struct ieee80211_local *local;
 357         int queues;
 358         int err = 0, i;
 359
 360         /* check that device is a mac80211 device */
 361         if (!dev->ieee80211_ptr ||
 362             dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
 363                 return -EINVAL;
 364
 365         /* check this device is an ieee80211 master type device */
 366         if (dev->type != ARPHRD_IEEE80211)
 367                 return -EINVAL;
 368
 369         /* check that there is no qdisc currently attached to device
 370          * this ensures that we will be the root qdisc. (I can't find a better
 371          * way to test this explicitly) */
 372         if (dev->qdisc_sleeping != &noop_qdisc)
 373                 return -EINVAL;
 374
 375         if (qd->flags & TCQ_F_INGRESS)
 376                 return -EINVAL;
 377
 378         local = wdev_priv(dev->ieee80211_ptr);
 379         queues = local->hw.queues;
 380
 381         /* if options were passed in, set them */
 382         if (opt) {
 383                 err = wme_qdiscop_tune(qd, opt);
 384         }
 385
 386         /* create child queues */
 387         for (i = 0; i < queues; i++) {
 388                 skb_queue_head_init(&q->requeued[i]);
 389                 q->queues[i] = qdisc_create_dflt(qd->dev, &pfifo_qdisc_ops,
 390                                                  qd->handle);
 391                 if (!q->queues[i]) {
 392                         q->queues[i] = &noop_qdisc;
 393                         printk(KERN_ERR "%s child qdisc %i creation failed", dev->name, i);
 394                 }
 395         }
 396
 397         /* reserve all legacy QoS queues */
 398         for (i = 0; i < min(IEEE80211_TX_QUEUE_DATA4, queues); i++)
 399                 set_bit(i, &q->qdisc_pool);
 400
 401         return err;
 402 }
 403
 404 static int wme_qdiscop_dump(struct Qdisc *qd, struct sk_buff *skb)
 405 {
 406 /*      struct ieee80211_sched_data *q = qdisc_priv(qd);
 407         unsigned char *p = skb->tail;
 408         struct tc_ieee80211_qopt opt;
 409
 410         memcpy(&opt.tag2queue, q->tag2queue, TC_80211_MAX_TAG + 1);
 411         RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
 412 */      return skb->len;
 413 /*
 414 rtattr_failure:
 415         skb_trim(skb, p - skb->data);*/
 416         return -1;
 417 }
 418
 419
 420 static int wme_classop_graft(struct Qdisc *qd, unsigned long arg,
 421                              struct Qdisc *new, struct Qdisc **old)
 422 {
 423         struct ieee80211_sched_data *q = qdisc_priv(qd);
 424         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 425         struct ieee80211_hw *hw = &local->hw;
 426         unsigned long queue = arg - 1;
 427
 428         if (queue >= hw->queues)
 429                 return -EINVAL;
 430
 431         if (!new)
 432                 new = &noop_qdisc;
 433
 434         sch_tree_lock(qd);
 435         *old = q->queues[queue];
 436         q->queues[queue] = new;
 437         qdisc_reset(*old);
 438         sch_tree_unlock(qd);
 439
 440         return 0;
 441 }
 442
 443
 444 static struct Qdisc *
 445 wme_classop_leaf(struct Qdisc *qd, unsigned long arg)
 446 {
 447         struct ieee80211_sched_data *q = qdisc_priv(qd);
 448         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 449         struct ieee80211_hw *hw = &local->hw;
 450         unsigned long queue = arg - 1;
 451
 452         if (queue >= hw->queues)
 453                 return NULL;
 454
 455         return q->queues[queue];
 456 }
 457
 458
 459 static unsigned long wme_classop_get(struct Qdisc *qd, u32 classid)
 460 {
 461         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 462         struct ieee80211_hw *hw = &local->hw;
 463         unsigned long queue = TC_H_MIN(classid);
 464
 465         if (queue - 1 >= hw->queues)
 466                 return 0;
 467
 468         return queue;
 469 }
 470
 471
 472 static unsigned long wme_classop_bind(struct Qdisc *qd, unsigned long parent,
 473                                       u32 classid)
 474 {
 475         return wme_classop_get(qd, classid);
 476 }
 477
 478
 479 static void wme_classop_put(struct Qdisc *q, unsigned long cl)
 480 {
 481 }
 482
 483
 484 static int wme_classop_change(struct Qdisc *qd, u32 handle, u32 parent,
 485                               struct rtattr **tca, unsigned long *arg)
 486 {
 487         unsigned long cl = *arg;
 488         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 489         struct ieee80211_hw *hw = &local->hw;
 490
 491         if (cl - 1 > hw->queues)
 492                 return -ENOENT;
 493
 494         /* TODO: put code to program hardware queue parameters here,
 495          * to allow programming from tc command line */
 496
 497         return 0;
 498 }
 499
 500
 501 /* we don't support deleting hardware queues
 502  * when we add WMM-SA support - TSPECs may be deleted here */
 503 static int wme_classop_delete(struct Qdisc *qd, unsigned long cl)
 504 {
 505         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 506         struct ieee80211_hw *hw = &local->hw;
 507
 508         if (cl - 1 > hw->queues)
 509                 return -ENOENT;
 510         return 0;
 511 }
 512
 513
 514 static int wme_classop_dump_class(struct Qdisc *qd, unsigned long cl,
 515                                   struct sk_buff *skb, struct tcmsg *tcm)
 516 {
 517         struct ieee80211_sched_data *q = qdisc_priv(qd);
 518         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 519         struct ieee80211_hw *hw = &local->hw;
 520
 521         if (cl - 1 > hw->queues)
 522                 return -ENOENT;
 523         tcm->tcm_handle = TC_H_MIN(cl);
 524         tcm->tcm_parent = qd->handle;
 525         tcm->tcm_info = q->queues[cl-1]->handle; /* do we need this? */
 526         return 0;
 527 }
 528
 529
 530 static void wme_classop_walk(struct Qdisc *qd, struct qdisc_walker *arg)
 531 {
 532         struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
 533         struct ieee80211_hw *hw = &local->hw;
 534         int queue;
 535
 536         if (arg->stop)
 537                 return;
 538
 539         for (queue = 0; queue < hw->queues; queue++) {
 540                 if (arg->count < arg->skip) {
 541                         arg->count++;
 542                         continue;
 543                 }
 544                 /* we should return classids for our internal queues here
 545                  * as well as the external ones */
 546                 if (arg->fn(qd, queue+1, arg) < 0) {
 547                         arg->stop = 1;
 548                         break;
 549                 }
 550                 arg->count++;
 551         }
 552 }
 553
 554
 555 static struct tcf_proto ** wme_classop_find_tcf(struct Qdisc *qd,
 556                                                 unsigned long cl)
 557 {
 558         struct ieee80211_sched_data *q = qdisc_priv(qd);
 559
 560         if (cl)
 561                 return NULL;
 562
 563         return &q->filter_list;
 564 }
 565
 566
 567 /* this qdisc is classful (i.e. has classes, some of which may have leaf qdiscs attached)
 568  * - these are the operations on the classes */
 569 static struct Qdisc_class_ops class_ops =
 570 {
 571         .graft = wme_classop_graft,
 572         .leaf = wme_classop_leaf,
 573
 574         .get = wme_classop_get,
 575         .put = wme_classop_put,
 576         .change = wme_classop_change,
 577         .delete = wme_classop_delete,
 578         .walk = wme_classop_walk,
 579
 580         .tcf_chain = wme_classop_find_tcf,
 581         .bind_tcf = wme_classop_bind,
 582         .unbind_tcf = wme_classop_put,
 583
 584         .dump = wme_classop_dump_class,
 585 };
 586
 587
 588 /* queueing discipline operations */
 589 static struct Qdisc_ops wme_qdisc_ops =
 590 {
 591         .next = NULL,
 592         .cl_ops = &class_ops,
 593         .id = "ieee80211",
 594         .priv_size = sizeof(struct ieee80211_sched_data),
 595
 596         .enqueue = wme_qdiscop_enqueue,
 597         .dequeue = wme_qdiscop_dequeue,
 598         .requeue = wme_qdiscop_requeue,
 599         .drop = NULL, /* drop not needed since we are always the root qdisc */
 600
 601         .init = wme_qdiscop_init,
 602         .reset = wme_qdiscop_reset,
 603         .destroy = wme_qdiscop_destroy,
 604         .change = wme_qdiscop_tune,
 605
 606         .dump = wme_qdiscop_dump,
 607 };
 608
 609
 610 void ieee80211_install_qdisc(struct net_device *dev)
 611 {
 612         struct Qdisc *qdisc;
 613
 614         qdisc = qdisc_create_dflt(dev, &wme_qdisc_ops, TC_H_ROOT);
 615         if (!qdisc) {
 616                 printk(KERN_ERR "%s: qdisc installation failed\n", dev->name);
 617                 return;
 618         }
 619
 620         /* same handle as would be allocated by qdisc_alloc_handle() */
 621         qdisc->handle = 0x80010000;
 622
 623         qdisc_lock_tree(dev);
 624         list_add_tail(&qdisc->list, &dev->qdisc_list);
 625         dev->qdisc_sleeping = qdisc;
 626         qdisc_unlock_tree(dev);
 627 }
 628
 629
 630 int ieee80211_qdisc_installed(struct net_device *dev)
 631 {
 632         return dev->qdisc_sleeping->ops == &wme_qdisc_ops;
 633 }
 634
 635
 636 int ieee80211_wme_register(void)
 637 {
 638         return register_qdisc(&wme_qdisc_ops);
 639 }
 640
 641
 642 void ieee80211_wme_unregister(void)
 643 {
 644         unregister_qdisc(&wme_qdisc_ops);
 645 }
 646
 647 int ieee80211_ht_agg_queue_add(struct ieee80211_local *local,
 648                         struct sta_info *sta, u16 tid)
 649 {
 650         int i;
 651         struct ieee80211_sched_data *q =
 652                         qdisc_priv(local->mdev->qdisc_sleeping);
 653         DECLARE_MAC_BUF(mac);
 654
 655         /* prepare the filter and save it for the SW queue
 656          * matching the recieved HW queue */
 657
 658         /* try to get a Qdisc from the pool */
 659         for (i = IEEE80211_TX_QUEUE_BEACON; i < local->hw.queues; i++)
 660                 if (!test_and_set_bit(i, &q->qdisc_pool)) {
 661                         ieee80211_stop_queue(local_to_hw(local), i);
 662                         sta->tid_to_tx_q[tid] = i;
 663
 664                         /* IF there are already pending packets
 665                          * on this tid first we need to drain them
 666                          * on the previous queue
 667                          * since HT is strict in order */
 668 #ifdef CONFIG_MAC80211_HT_DEBUG
 669                         if (net_ratelimit())
 670                                 printk(KERN_DEBUG "allocated aggregation queue"
 671                                         " %d tid %d addr %s pool=0x%lX\n",
 672                                         i, tid, print_mac(mac, sta->addr),
 673                                         q->qdisc_pool);
 674 #endif /* CONFIG_MAC80211_HT_DEBUG */
 675                         return 0;
 676                 }
 677
 678         return -EAGAIN;
 679 }
 680
 681 /**
 682  * the caller needs to hold local->mdev->queue_lock
 683  */
 684 void ieee80211_ht_agg_queue_remove(struct ieee80211_local *local,
 685                                    struct sta_info *sta, u16 tid,
 686                                    u8 requeue)
 687 {
 688         struct ieee80211_sched_data *q =
 689                 qdisc_priv(local->mdev->qdisc_sleeping);
 690         int agg_queue = sta->tid_to_tx_q[tid];
 691
 692         /* return the qdisc to the pool */
 693         clear_bit(agg_queue, &q->qdisc_pool);
 694         sta->tid_to_tx_q[tid] = local->hw.queues;
 695
 696         if (requeue)
 697                 ieee80211_requeue(local, agg_queue);
 698         else
 699                 q->queues[agg_queue]->ops->reset(q->queues[agg_queue]);
 700 }
 701
 702 void ieee80211_requeue(struct ieee80211_local *local, int queue)
 703 {
 704         struct Qdisc *root_qd = local->mdev->qdisc_sleeping;
 705         struct ieee80211_sched_data *q = qdisc_priv(root_qd);
 706         struct Qdisc *qdisc = q->queues[queue];
 707         struct sk_buff *skb = NULL;
 708         u32 len = qdisc->q.qlen;
 709
 710         if (!qdisc || !qdisc->dequeue)
 711                 return;
 712
 713         printk(KERN_DEBUG "requeue: qlen = %d\n", qdisc->q.qlen);
 714         for (len = qdisc->q.qlen; len > 0; len--) {
 715                 skb = qdisc->dequeue(qdisc);
 716                 root_qd->q.qlen--;
 717                 /* packet will be classified again and */
 718                 /* skb->packet_data->queue will be overridden if needed */
 719                 if (skb)
 720                         wme_qdiscop_enqueue(skb, root_qd);
 721         }
 722 }