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         struct data_queue *queue;
  85         struct skb_frame_desc *skbdesc;
  86         u16 frame_control;
  87
  88         /*
  89          * Mac80211 might be calling this function while we are trying
  90          * to remove the device or perhaps suspending it.
  91          * Note that we can only stop the TX queues inside the TX path
  92          * due to possible race conditions in mac80211.
  93          */
  94         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
  95                 ieee80211_stop_queues(hw);
  96                 return NETDEV_TX_OK;
  97         }
  98
  99         /*
 100          * Determine which queue to put packet on.
 101          */
 102         if (control->flags & IEEE80211_TXCTL_SEND_AFTER_DTIM &&
 103             test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
 104                 queue = rt2x00queue_get_queue(rt2x00dev, RT2X00_BCN_QUEUE_ATIM);
 105         else
 106                 queue = rt2x00queue_get_queue(rt2x00dev, control->queue);
 107         if (unlikely(!queue)) {
 108                 ERROR(rt2x00dev,
 109                       "Attempt to send packet over invalid queue %d.\n"
 110                       "Please file bug report to %s.\n",
 111                       control->queue, 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, control->queue);
 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 =
 191             rt2x00queue_get_queue(rt2x00dev, RT2X00_BCN_QUEUE_BEACON);
 192         struct queue_entry *entry = NULL;
 193         unsigned int i;
 194
 195         /*
 196          * Don't allow interfaces to be added
 197          * the device has disappeared.
 198          */
 199         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
 200             !test_bit(DEVICE_STARTED, &rt2x00dev->flags))
 201                 return -ENODEV;
 202
 203         /*
 204          * When we don't support mixed interfaces (a combination
 205          * of sta and ap virtual interfaces) then we can only
 206          * add this interface when the rival interface count is 0.
 207          */
 208         if (!test_bit(DRIVER_SUPPORT_MIXED_INTERFACES, &rt2x00dev->flags) &&
 209             ((conf->type == IEEE80211_IF_TYPE_AP && rt2x00dev->intf_sta_count) ||
 210              (conf->type != IEEE80211_IF_TYPE_AP && rt2x00dev->intf_ap_count)))
 211                 return -ENOBUFS;
 212
 213         /*
 214          * Check if we exceeded the maximum amount of supported interfaces.
 215          */
 216         if ((conf->type == IEEE80211_IF_TYPE_AP &&
 217              rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf) ||
 218             (conf->type != IEEE80211_IF_TYPE_AP &&
 219              rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf))
 220                 return -ENOBUFS;
 221
 222         /*
 223          * Loop through all beacon queues to find a free
 224          * entry. Since there are as much beacon entries
 225          * as the maximum interfaces, this search shouldn't
 226          * fail.
 227          */
 228         for (i = 0; i < queue->limit; i++) {
 229                 entry = &queue->entries[i];
 230                 if (!__test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
 231                         break;
 232         }
 233
 234         if (unlikely(i == queue->limit))
 235                 return -ENOBUFS;
 236
 237         /*
 238          * We are now absolutely sure the interface can be created,
 239          * increase interface count and start initialization.
 240          */
 241
 242         if (conf->type == IEEE80211_IF_TYPE_AP)
 243                 rt2x00dev->intf_ap_count++;
 244         else
 245                 rt2x00dev->intf_sta_count++;
 246
 247         spin_lock_init(&intf->lock);
 248         intf->beacon = entry;
 249
 250         if (conf->type == IEEE80211_IF_TYPE_AP)
 251                 memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
 252         memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
 253
 254         /*
 255          * The MAC adddress must be configured after the device
 256          * has been initialized. Otherwise the device can reset
 257          * the MAC registers.
 258          */
 259         rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);
 260
 261         /*
 262          * Some filters depend on the current working mode. We can force
 263          * an update during the next configure_filter() run by mac80211 by
 264          * resetting the current packet_filter state.
 265          */
 266         rt2x00dev->packet_filter = 0;
 267
 268         return 0;
 269 }
 270 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
 271
 272 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
 273                                 struct ieee80211_if_init_conf *conf)
 274 {
 275         struct rt2x00_dev *rt2x00dev = hw->priv;
 276         struct rt2x00_intf *intf = vif_to_intf(conf->vif);
 277
 278         /*
 279          * Don't allow interfaces to be remove while
 280          * either the device has disappeared or when
 281          * no interface is present.
 282          */
 283         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
 284             (conf->type == IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_ap_count) ||
 285             (conf->type != IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_sta_count))
 286                 return;
 287
 288         if (conf->type == IEEE80211_IF_TYPE_AP)
 289                 rt2x00dev->intf_ap_count--;
 290         else
 291                 rt2x00dev->intf_sta_count--;
 292
 293         /*
 294          * Release beacon entry so it is available for
 295          * new interfaces again.
 296          */
 297         __clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
 298
 299         /*
 300          * Make sure the bssid and mac address registers
 301          * are cleared to prevent false ACKing of frames.
 302          */
 303         rt2x00lib_config_intf(rt2x00dev, intf,
 304                               IEEE80211_IF_TYPE_INVALID, NULL, NULL);
 305 }
 306 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
 307
 308 int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
 309 {
 310         struct rt2x00_dev *rt2x00dev = hw->priv;
 311
 312         /*
 313          * Mac80211 might be calling this function while we are trying
 314          * to remove the device or perhaps suspending it.
 315          */
 316         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
 317                 return 0;
 318
 319         /*
 320          * Check if we need to disable the radio,
 321          * if this is not the case, at least the RX must be disabled.
 322          */
 323         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
 324                 if (!conf->radio_enabled)
 325                         rt2x00lib_disable_radio(rt2x00dev);
 326                 else
 327                         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 328         }
 329
 330         rt2x00lib_config(rt2x00dev, conf, 0);
 331
 332         /*
 333          * Reenable RX only if the radio should be on.
 334          */
 335         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 336                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 337         else if (conf->radio_enabled)
 338                 return rt2x00lib_enable_radio(rt2x00dev);
 339
 340         return 0;
 341 }
 342 EXPORT_SYMBOL_GPL(rt2x00mac_config);
 343
 344 int rt2x00mac_config_interface(struct ieee80211_hw *hw,
 345                                struct ieee80211_vif *vif,
 346                                struct ieee80211_if_conf *conf)
 347 {
 348         struct rt2x00_dev *rt2x00dev = hw->priv;
 349         struct rt2x00_intf *intf = vif_to_intf(vif);
 350         int status;
 351
 352         /*
 353          * Mac80211 might be calling this function while we are trying
 354          * to remove the device or perhaps suspending it.
 355          */
 356         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
 357                 return 0;
 358
 359         spin_lock(&intf->lock);
 360
 361         /*
 362          * If the interface does not work in master mode,
 363          * then the bssid value in the interface structure
 364          * should now be set.
 365          */
 366         if (conf->type != IEEE80211_IF_TYPE_AP)
 367                 memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
 368
 369         spin_unlock(&intf->lock);
 370
 371         /*
 372          * Call rt2x00_config_intf() outside of the spinlock context since
 373          * the call will sleep for USB drivers. By using the ieee80211_if_conf
 374          * values as arguments we make keep access to rt2x00_intf thread safe
 375          * even without the lock.
 376          */
 377         rt2x00lib_config_intf(rt2x00dev, intf, conf->type, NULL, conf->bssid);
 378
 379         /*
 380          * We only need to initialize the beacon when master mode is enabled.
 381          */
 382         if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
 383                 return 0;
 384
 385         status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
 386                                                    conf->beacon,
 387                                                    conf->beacon_control);
 388         if (status)
 389                 dev_kfree_skb(conf->beacon);
 390
 391         return status;
 392 }
 393 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
 394
 395 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
 396                                 unsigned int changed_flags,
 397                                 unsigned int *total_flags,
 398                                 int mc_count, struct dev_addr_list *mc_list)
 399 {
 400         struct rt2x00_dev *rt2x00dev = hw->priv;
 401
 402         /*
 403          * Mask off any flags we are going to ignore
 404          * from the total_flags field.
 405          */
 406         *total_flags &=
 407             FIF_ALLMULTI |
 408             FIF_FCSFAIL |
 409             FIF_PLCPFAIL |
 410             FIF_CONTROL |
 411             FIF_OTHER_BSS |
 412             FIF_PROMISC_IN_BSS;
 413
 414         /*
 415          * Apply some rules to the filters:
 416          * - Some filters imply different filters to be set.
 417          * - Some things we can't filter out at all.
 418          * - Multicast filter seems to kill broadcast traffic so never use it.
 419          */
 420         *total_flags |= FIF_ALLMULTI;
 421         if (*total_flags & FIF_OTHER_BSS ||
 422             *total_flags & FIF_PROMISC_IN_BSS)
 423                 *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
 424
 425         /*
 426          * Check if there is any work left for us.
 427          */
 428         if (rt2x00dev->packet_filter == *total_flags)
 429                 return;
 430         rt2x00dev->packet_filter = *total_flags;
 431
 432         if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
 433                 rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
 434         else
 435                 queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->filter_work);
 436 }
 437 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
 438
 439 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
 440                         struct ieee80211_low_level_stats *stats)
 441 {
 442         struct rt2x00_dev *rt2x00dev = hw->priv;
 443
 444         /*
 445          * The dot11ACKFailureCount, dot11RTSFailureCount and
 446          * dot11RTSSuccessCount are updated in interrupt time.
 447          * dot11FCSErrorCount is updated in the link tuner.
 448          */
 449         memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
 450
 451         return 0;
 452 }
 453 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
 454
 455 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
 456                            struct ieee80211_tx_queue_stats *stats)
 457 {
 458         struct rt2x00_dev *rt2x00dev = hw->priv;
 459         unsigned int i;
 460
 461         for (i = 0; i < hw->queues; i++) {
 462                 stats->data[i].len = rt2x00dev->tx[i].length;
 463                 stats->data[i].limit = rt2x00dev->tx[i].limit;
 464                 stats->data[i].count = rt2x00dev->tx[i].count;
 465         }
 466
 467         return 0;
 468 }
 469 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
 470
 471 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
 472                                 struct ieee80211_vif *vif,
 473                                 struct ieee80211_bss_conf *bss_conf,
 474                                 u32 changes)
 475 {
 476         struct rt2x00_dev *rt2x00dev = hw->priv;
 477         struct rt2x00_intf *intf = vif_to_intf(vif);
 478         unsigned int delayed = 0;
 479
 480         /*
 481          * When the association status has changed we must reset the link
 482          * tuner counter. This is because some drivers determine if they
 483          * should perform link tuning based on the number of seconds
 484          * while associated or not associated.
 485          */
 486         if (changes & BSS_CHANGED_ASSOC) {
 487                 rt2x00dev->link.count = 0;
 488
 489                 if (bss_conf->assoc)
 490                         rt2x00dev->intf_associated++;
 491                 else
 492                         rt2x00dev->intf_associated--;
 493
 494                 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
 495                         rt2x00leds_led_assoc(rt2x00dev,
 496                                              !!rt2x00dev->intf_associated);
 497                 else
 498                         delayed |= DELAYED_LED_ASSOC;
 499         }
 500
 501         /*
 502          * When the erp information has changed, we should perform
 503          * additional configuration steps. For all other changes we are done.
 504          */
 505         if (changes & BSS_CHANGED_ERP_PREAMBLE) {
 506                 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
 507                         rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);
 508                 else
 509                         delayed |= DELAYED_CONFIG_ERP;
 510         }
 511
 512         spin_lock(&intf->lock);
 513         memcpy(&intf->conf, bss_conf, sizeof(*bss_conf));
 514         if (delayed) {
 515                 intf->delayed_flags |= delayed;
 516                 queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->intf_work);
 517         }
 518         spin_unlock(&intf->lock);
 519 }
 520 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
 521
 522 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue_idx,
 523                       const struct ieee80211_tx_queue_params *params)
 524 {
 525         struct rt2x00_dev *rt2x00dev = hw->priv;
 526         struct data_queue *queue;
 527
 528         queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
 529         if (unlikely(!queue))
 530                 return -EINVAL;
 531
 532         /*
 533          * The passed variables are stored as real value ((2^n)-1).
 534          * Ralink registers require to know the bit number 'n'.
 535          */
 536         if (params->cw_min > 0)
 537                 queue->cw_min = fls(params->cw_min);
 538         else
 539                 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
 540
 541         if (params->cw_max > 0)
 542                 queue->cw_max = fls(params->cw_max);
 543         else
 544                 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
 545
 546         if (params->aifs >= 0)
 547                 queue->aifs = params->aifs;
 548         else
 549                 queue->aifs = 2;
 550
 551         INFO(rt2x00dev,
 552              "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
 553              queue_idx, queue->cw_min, queue->cw_max, queue->aifs);
 554
 555         return 0;
 556 }
 557 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);