err.no Git - linux-2.6/blob - drivers/net/wireless/rt2x00/rt2x00mac.c

   1 /*
   2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00mac
  23         Abstract: rt2x00 generic mac80211 routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28
  29 #include "rt2x00.h"
  30 #include "rt2x00lib.h"
  31
  32 static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
  33                                 struct data_queue *queue,
  34                                 struct sk_buff *frag_skb,
  35                                 struct ieee80211_tx_control *control)
  36 {
  37         struct skb_frame_desc *skbdesc;
  38         struct sk_buff *skb;
  39         int size;
  40
  41         if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
  42                 size = sizeof(struct ieee80211_cts);
  43         else
  44                 size = sizeof(struct ieee80211_rts);
  45
  46         skb = dev_alloc_skb(size + rt2x00dev->hw->extra_tx_headroom);
  47         if (!skb) {
  48                 WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
  49                 return NETDEV_TX_BUSY;
  50         }
  51
  52         skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
  53         skb_put(skb, size);
  54
  55         if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
  56                 ieee80211_ctstoself_get(rt2x00dev->hw, control->vif,
  57                                         frag_skb->data, frag_skb->len, control,
  58                                         (struct ieee80211_cts *)(skb->data));
  59         else
  60                 ieee80211_rts_get(rt2x00dev->hw, control->vif,
  61                                   frag_skb->data, frag_skb->len, control,
  62                                   (struct ieee80211_rts *)(skb->data));
  63
  64         /*
  65          * Initialize skb descriptor
  66          */
  67         skbdesc = get_skb_frame_desc(skb);
  68         memset(skbdesc, 0, sizeof(*skbdesc));
  69         skbdesc->flags |= FRAME_DESC_DRIVER_GENERATED;
  70
  71         if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb, control)) {
  72                 WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
  73                 return NETDEV_TX_BUSY;
  74         }
  75
  76         return NETDEV_TX_OK;
  77 }
  78
  79 int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
  80                  struct ieee80211_tx_control *control)
  81 {
  82         struct rt2x00_dev *rt2x00dev = hw->priv;
  83         struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
  84         enum data_queue_qid qid = mac80211_queue_to_qid(control->queue);
  85         struct data_queue *queue;
  86         struct skb_frame_desc *skbdesc;
  87         u16 frame_control;
  88
  89         /*
  90          * Mac80211 might be calling this function while we are trying
  91          * to remove the device or perhaps suspending it.
  92          * Note that we can only stop the TX queues inside the TX path
  93          * due to possible race conditions in mac80211.
  94          */
  95         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
  96                 ieee80211_stop_queues(hw);
  97                 return NETDEV_TX_OK;
  98         }
  99
 100         /*
 101          * Determine which queue to put packet on.
 102          */
 103         if (control->flags & IEEE80211_TXCTL_SEND_AFTER_DTIM &&
 104             test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
 105                 queue = rt2x00queue_get_queue(rt2x00dev, QID_ATIM);
 106         else
 107                 queue = rt2x00queue_get_queue(rt2x00dev, qid);
 108         if (unlikely(!queue)) {
 109                 ERROR(rt2x00dev,
 110                       "Attempt to send packet over invalid queue %d.\n"
 111                       "Please file bug report to %s.\n", qid, DRV_PROJECT);
 112                 dev_kfree_skb_any(skb);
 113                 return NETDEV_TX_OK;
 114         }
 115
 116         /*
 117          * If CTS/RTS is required. and this frame is not CTS or RTS,
 118          * create and queue that frame first. But make sure we have
 119          * at least enough entries available to send this CTS/RTS
 120          * frame as well as the data frame.
 121          * Note that when the driver has set the set_rts_threshold()
 122          * callback function it doesn't need software generation of
 123          * neither RTS or CTS-to-self frames and handles everything
 124          * inside the hardware.
 125          */
 126         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 127         if (!is_rts_frame(frame_control) && !is_cts_frame(frame_control) &&
 128             (control->flags & (IEEE80211_TXCTL_USE_RTS_CTS |
 129                                IEEE80211_TXCTL_USE_CTS_PROTECT)) &&
 130             !rt2x00dev->ops->hw->set_rts_threshold) {
 131                 if (rt2x00queue_available(queue) <= 1) {
 132                         ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 133                         return NETDEV_TX_BUSY;
 134                 }
 135
 136                 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb, control)) {
 137                         ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 138                         return NETDEV_TX_BUSY;
 139                 }
 140         }
 141
 142         /*
 143          * Initialize skb descriptor
 144          */
 145         skbdesc = get_skb_frame_desc(skb);
 146         memset(skbdesc, 0, sizeof(*skbdesc));
 147
 148         if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb, control)) {
 149                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 150                 return NETDEV_TX_BUSY;
 151         }
 152
 153         if (rt2x00queue_full(queue))
 154                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 155
 156         if (rt2x00dev->ops->lib->kick_tx_queue)
 157                 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, qid);
 158
 159         return NETDEV_TX_OK;
 160 }
 161 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
 162
 163 int rt2x00mac_start(struct ieee80211_hw *hw)
 164 {
 165         struct rt2x00_dev *rt2x00dev = hw->priv;
 166
 167         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
 168                 return 0;
 169
 170         return rt2x00lib_start(rt2x00dev);
 171 }
 172 EXPORT_SYMBOL_GPL(rt2x00mac_start);
 173
 174 void rt2x00mac_stop(struct ieee80211_hw *hw)
 175 {
 176         struct rt2x00_dev *rt2x00dev = hw->priv;
 177
 178         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
 179                 return;
 180
 181         rt2x00lib_stop(rt2x00dev);
 182 }
 183 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
 184
 185 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
 186                             struct ieee80211_if_init_conf *conf)
 187 {
 188         struct rt2x00_dev *rt2x00dev = hw->priv;
 189         struct rt2x00_intf *intf = vif_to_intf(conf->vif);
 190         struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, QID_BEACON);
 191         struct queue_entry *entry = NULL;
 192         unsigned int i;
 193
 194         /*
 195          * Don't allow interfaces to be added
 196          * the device has disappeared.
 197          */
 198         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
 199             !test_bit(DEVICE_STARTED, &rt2x00dev->flags))
 200                 return -ENODEV;
 201
 202         /*
 203          * We don't support mixed combinations of sta and ap virtual
 204          * interfaces. We can only add this interface when the rival
 205          * interface count is 0.
 206          */
 207         if ((conf->type == IEEE80211_IF_TYPE_AP && rt2x00dev->intf_sta_count) ||
 208             (conf->type != IEEE80211_IF_TYPE_AP && rt2x00dev->intf_ap_count))
 209                 return -ENOBUFS;
 210
 211         /*
 212          * Check if we exceeded the maximum amount of supported interfaces.
 213          */
 214         if ((conf->type == IEEE80211_IF_TYPE_AP &&
 215              rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf) ||
 216             (conf->type != IEEE80211_IF_TYPE_AP &&
 217              rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf))
 218                 return -ENOBUFS;
 219
 220         /*
 221          * Loop through all beacon queues to find a free
 222          * entry. Since there are as much beacon entries
 223          * as the maximum interfaces, this search shouldn't
 224          * fail.
 225          */
 226         for (i = 0; i < queue->limit; i++) {
 227                 entry = &queue->entries[i];
 228                 if (!__test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
 229                         break;
 230         }
 231
 232         if (unlikely(i == queue->limit))
 233                 return -ENOBUFS;
 234
 235         /*
 236          * We are now absolutely sure the interface can be created,
 237          * increase interface count and start initialization.
 238          */
 239
 240         if (conf->type == IEEE80211_IF_TYPE_AP)
 241                 rt2x00dev->intf_ap_count++;
 242         else
 243                 rt2x00dev->intf_sta_count++;
 244
 245         spin_lock_init(&intf->lock);
 246         intf->beacon = entry;
 247
 248         if (conf->type == IEEE80211_IF_TYPE_AP)
 249                 memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
 250         memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
 251
 252         /*
 253          * The MAC adddress must be configured after the device
 254          * has been initialized. Otherwise the device can reset
 255          * the MAC registers.
 256          */
 257         rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);
 258
 259         /*
 260          * Some filters depend on the current working mode. We can force
 261          * an update during the next configure_filter() run by mac80211 by
 262          * resetting the current packet_filter state.
 263          */
 264         rt2x00dev->packet_filter = 0;
 265
 266         return 0;
 267 }
 268 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
 269
 270 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
 271                                 struct ieee80211_if_init_conf *conf)
 272 {
 273         struct rt2x00_dev *rt2x00dev = hw->priv;
 274         struct rt2x00_intf *intf = vif_to_intf(conf->vif);
 275
 276         /*
 277          * Don't allow interfaces to be remove while
 278          * either the device has disappeared or when
 279          * no interface is present.
 280          */
 281         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
 282             (conf->type == IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_ap_count) ||
 283             (conf->type != IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_sta_count))
 284                 return;
 285
 286         if (conf->type == IEEE80211_IF_TYPE_AP)
 287                 rt2x00dev->intf_ap_count--;
 288         else
 289                 rt2x00dev->intf_sta_count--;
 290
 291         /*
 292          * Release beacon entry so it is available for
 293          * new interfaces again.
 294          */
 295         __clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
 296
 297         /*
 298          * Make sure the bssid and mac address registers
 299          * are cleared to prevent false ACKing of frames.
 300          */
 301         rt2x00lib_config_intf(rt2x00dev, intf,
 302                               IEEE80211_IF_TYPE_INVALID, NULL, NULL);
 303 }
 304 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
 305
 306 int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
 307 {
 308         struct rt2x00_dev *rt2x00dev = hw->priv;
 309
 310         /*
 311          * Mac80211 might be calling this function while we are trying
 312          * to remove the device or perhaps suspending it.
 313          */
 314         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
 315                 return 0;
 316
 317         /*
 318          * Check if we need to disable the radio,
 319          * if this is not the case, at least the RX must be disabled.
 320          */
 321         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
 322                 if (!conf->radio_enabled)
 323                         rt2x00lib_disable_radio(rt2x00dev);
 324                 else
 325                         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 326         }
 327
 328         rt2x00lib_config(rt2x00dev, conf, 0);
 329
 330         /*
 331          * Reenable RX only if the radio should be on.
 332          */
 333         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 334                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 335         else if (conf->radio_enabled)
 336                 return rt2x00lib_enable_radio(rt2x00dev);
 337
 338         return 0;
 339 }
 340 EXPORT_SYMBOL_GPL(rt2x00mac_config);
 341
 342 int rt2x00mac_config_interface(struct ieee80211_hw *hw,
 343                                struct ieee80211_vif *vif,
 344                                struct ieee80211_if_conf *conf)
 345 {
 346         struct rt2x00_dev *rt2x00dev = hw->priv;
 347         struct rt2x00_intf *intf = vif_to_intf(vif);
 348         int status;
 349
 350         /*
 351          * Mac80211 might be calling this function while we are trying
 352          * to remove the device or perhaps suspending it.
 353          */
 354         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
 355                 return 0;
 356
 357         spin_lock(&intf->lock);
 358
 359         /*
 360          * If the interface does not work in master mode,
 361          * then the bssid value in the interface structure
 362          * should now be set.
 363          */
 364         if (conf->type != IEEE80211_IF_TYPE_AP)
 365                 memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
 366
 367         spin_unlock(&intf->lock);
 368
 369         /*
 370          * Call rt2x00_config_intf() outside of the spinlock context since
 371          * the call will sleep for USB drivers. By using the ieee80211_if_conf
 372          * values as arguments we make keep access to rt2x00_intf thread safe
 373          * even without the lock.
 374          */
 375         rt2x00lib_config_intf(rt2x00dev, intf, conf->type, NULL, conf->bssid);
 376
 377         /*
 378          * We only need to initialize the beacon when master mode is enabled.
 379          */
 380         if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
 381                 return 0;
 382
 383         status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
 384                                                    conf->beacon,
 385                                                    conf->beacon_control);
 386         if (status)
 387                 dev_kfree_skb(conf->beacon);
 388
 389         return status;
 390 }
 391 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
 392
 393 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
 394                                 unsigned int changed_flags,
 395                                 unsigned int *total_flags,
 396                                 int mc_count, struct dev_addr_list *mc_list)
 397 {
 398         struct rt2x00_dev *rt2x00dev = hw->priv;
 399
 400         /*
 401          * Mask off any flags we are going to ignore
 402          * from the total_flags field.
 403          */
 404         *total_flags &=
 405             FIF_ALLMULTI |
 406             FIF_FCSFAIL |
 407             FIF_PLCPFAIL |
 408             FIF_CONTROL |
 409             FIF_OTHER_BSS |
 410             FIF_PROMISC_IN_BSS;
 411
 412         /*
 413          * Apply some rules to the filters:
 414          * - Some filters imply different filters to be set.
 415          * - Some things we can't filter out at all.
 416          * - Multicast filter seems to kill broadcast traffic so never use it.
 417          */
 418         *total_flags |= FIF_ALLMULTI;
 419         if (*total_flags & FIF_OTHER_BSS ||
 420             *total_flags & FIF_PROMISC_IN_BSS)
 421                 *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
 422
 423         /*
 424          * Check if there is any work left for us.
 425          */
 426         if (rt2x00dev->packet_filter == *total_flags)
 427                 return;
 428         rt2x00dev->packet_filter = *total_flags;
 429
 430         if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
 431                 rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
 432         else
 433                 queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->filter_work);
 434 }
 435 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
 436
 437 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
 438                         struct ieee80211_low_level_stats *stats)
 439 {
 440         struct rt2x00_dev *rt2x00dev = hw->priv;
 441
 442         /*
 443          * The dot11ACKFailureCount, dot11RTSFailureCount and
 444          * dot11RTSSuccessCount are updated in interrupt time.
 445          * dot11FCSErrorCount is updated in the link tuner.
 446          */
 447         memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
 448
 449         return 0;
 450 }
 451 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
 452
 453 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
 454                            struct ieee80211_tx_queue_stats *stats)
 455 {
 456         struct rt2x00_dev *rt2x00dev = hw->priv;
 457         unsigned int i;
 458
 459         for (i = 0; i < hw->queues; i++) {
 460                 stats->data[i].len = rt2x00dev->tx[i].length;
 461                 stats->data[i].limit = rt2x00dev->tx[i].limit;
 462                 stats->data[i].count = rt2x00dev->tx[i].count;
 463         }
 464
 465         return 0;
 466 }
 467 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
 468
 469 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
 470                                 struct ieee80211_vif *vif,
 471                                 struct ieee80211_bss_conf *bss_conf,
 472                                 u32 changes)
 473 {
 474         struct rt2x00_dev *rt2x00dev = hw->priv;
 475         struct rt2x00_intf *intf = vif_to_intf(vif);
 476         unsigned int delayed = 0;
 477
 478         /*
 479          * When the association status has changed we must reset the link
 480          * tuner counter. This is because some drivers determine if they
 481          * should perform link tuning based on the number of seconds
 482          * while associated or not associated.
 483          */
 484         if (changes & BSS_CHANGED_ASSOC) {
 485                 rt2x00dev->link.count = 0;
 486
 487                 if (bss_conf->assoc)
 488                         rt2x00dev->intf_associated++;
 489                 else
 490                         rt2x00dev->intf_associated--;
 491
 492                 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
 493                         rt2x00leds_led_assoc(rt2x00dev,
 494                                              !!rt2x00dev->intf_associated);
 495                 else
 496                         delayed |= DELAYED_LED_ASSOC;
 497         }
 498
 499         /*
 500          * When the erp information has changed, we should perform
 501          * additional configuration steps. For all other changes we are done.
 502          */
 503         if (changes & BSS_CHANGED_ERP_PREAMBLE) {
 504                 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
 505                         rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);
 506                 else
 507                         delayed |= DELAYED_CONFIG_ERP;
 508         }
 509
 510         spin_lock(&intf->lock);
 511         memcpy(&intf->conf, bss_conf, sizeof(*bss_conf));
 512         if (delayed) {
 513                 intf->delayed_flags |= delayed;
 514                 queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->intf_work);
 515         }
 516         spin_unlock(&intf->lock);
 517 }
 518 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
 519
 520 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue_idx,
 521                       const struct ieee80211_tx_queue_params *params)
 522 {
 523         struct rt2x00_dev *rt2x00dev = hw->priv;
 524         struct data_queue *queue;
 525
 526         queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
 527         if (unlikely(!queue))
 528                 return -EINVAL;
 529
 530         /*
 531          * The passed variables are stored as real value ((2^n)-1).
 532          * Ralink registers require to know the bit number 'n'.
 533          */
 534         if (params->cw_min > 0)
 535                 queue->cw_min = fls(params->cw_min);
 536         else
 537                 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
 538
 539         if (params->cw_max > 0)
 540                 queue->cw_max = fls(params->cw_max);
 541         else
 542                 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
 543
 544         if (params->aifs >= 0)
 545                 queue->aifs = params->aifs;
 546         else
 547                 queue->aifs = 2;
 548
 549         INFO(rt2x00dev,
 550              "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
 551              queue_idx, queue->cw_min, queue->cw_max, queue->aifs);
 552
 553         return 0;
 554 }
 555 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);