drivers/net/wireless/rt2x00/rt2x00mac.c

   1 /*
   2         Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
   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 {
  36         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(frag_skb);
  37         struct ieee80211_tx_info *rts_info;
  38         struct sk_buff *skb;
  39         unsigned int data_length;
  40         int retval = 0;
  41
  42         if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
  43                 data_length = sizeof(struct ieee80211_cts);
  44         else
  45                 data_length = sizeof(struct ieee80211_rts);
  46
  47         skb = dev_alloc_skb(data_length + rt2x00dev->hw->extra_tx_headroom);
  48         if (unlikely(!skb)) {
  49                 WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
  50                 return -ENOMEM;
  51         }
  52
  53         skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
  54         skb_put(skb, data_length);
  55
  56         /*
  57          * Copy TX information over from original frame to
  58          * RTS/CTS frame. Note that we set the no encryption flag
  59          * since we don't want this frame to be encrypted.
  60          * RTS frames should be acked, while CTS-to-self frames
  61          * should not. The ready for TX flag is cleared to prevent
  62          * it being automatically send when the descriptor is
  63          * written to the hardware.
  64          */
  65         memcpy(skb->cb, frag_skb->cb, sizeof(skb->cb));
  66         rts_info = IEEE80211_SKB_CB(skb);
  67         rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_RTS_CTS;
  68         rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_CTS_PROTECT;
  69
  70         if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
  71                 rts_info->flags |= IEEE80211_TX_CTL_NO_ACK;
  72         else
  73                 rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
  74
  75         /* Disable hardware encryption */
  76         rts_info->control.hw_key = NULL;
  77
  78         /*
  79          * RTS/CTS frame should use the length of the frame plus any
  80          * encryption overhead that will be added by the hardware.
  81          */
  82         data_length += rt2x00crypto_tx_overhead(rt2x00dev, skb);
  83
  84         if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
  85                 ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,
  86                                         frag_skb->data, data_length, tx_info,
  87                                         (struct ieee80211_cts *)(skb->data));
  88         else
  89                 ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
  90                                   frag_skb->data, data_length, tx_info,
  91                                   (struct ieee80211_rts *)(skb->data));
  92
  93         retval = rt2x00queue_write_tx_frame(queue, skb, true);
  94         if (retval) {
  95                 dev_kfree_skb_any(skb);
  96                 WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
  97         }
  98
  99         return retval;
 100 }
 101
 102 int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
 103 {
 104         struct rt2x00_dev *rt2x00dev = hw->priv;
 105         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 106         enum data_queue_qid qid = skb_get_queue_mapping(skb);
 107         struct data_queue *queue;
 108
 109         /*
 110          * Mac80211 might be calling this function while we are trying
 111          * to remove the device or perhaps suspending it.
 112          * Note that we can only stop the TX queues inside the TX path
 113          * due to possible race conditions in mac80211.
 114          */
 115         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 116                 goto exit_fail;
 117
 118         /*
 119          * Determine which queue to put packet on.
 120          */
 121         if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
 122             test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
 123                 queue = rt2x00queue_get_queue(rt2x00dev, QID_ATIM);
 124         else
 125                 queue = rt2x00queue_get_queue(rt2x00dev, qid);
 126         if (unlikely(!queue)) {
 127                 ERROR(rt2x00dev,
 128                       "Attempt to send packet over invalid queue %d.\n"
 129                       "Please file bug report to %s.\n", qid, DRV_PROJECT);
 130                 goto exit_fail;
 131         }
 132
 133         /*
 134          * If CTS/RTS is required. create and queue that frame first.
 135          * Make sure we have at least enough entries available to send
 136          * this CTS/RTS frame as well as the data frame.
 137          * Note that when the driver has set the set_rts_threshold()
 138          * callback function it doesn't need software generation of
 139          * either RTS or CTS-to-self frame and handles everything
 140          * inside the hardware.
 141          */
 142         if ((tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS |
 143                                                 IEEE80211_TX_RC_USE_CTS_PROTECT)) &&
 144             !rt2x00dev->ops->hw->set_rts_threshold) {
 145                 if (rt2x00queue_available(queue) <= 1)
 146                         goto exit_fail;
 147
 148                 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
 149                         goto exit_fail;
 150         }
 151
 152         if (rt2x00queue_write_tx_frame(queue, skb, false))
 153                 goto exit_fail;
 154
 155         if (rt2x00queue_threshold(queue))
 156                 ieee80211_stop_queue(rt2x00dev->hw, qid);
 157
 158         return NETDEV_TX_OK;
 159
 160  exit_fail:
 161         ieee80211_stop_queue(rt2x00dev->hw, qid);
 162         dev_kfree_skb_any(skb);
 163         return NETDEV_TX_OK;
 164 }
 165 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
 166
 167 int rt2x00mac_start(struct ieee80211_hw *hw)
 168 {
 169         struct rt2x00_dev *rt2x00dev = hw->priv;
 170
 171         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 172                 return 0;
 173
 174         return rt2x00lib_start(rt2x00dev);
 175 }
 176 EXPORT_SYMBOL_GPL(rt2x00mac_start);
 177
 178 void rt2x00mac_stop(struct ieee80211_hw *hw)
 179 {
 180         struct rt2x00_dev *rt2x00dev = hw->priv;
 181
 182         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 183                 return;
 184
 185         rt2x00lib_stop(rt2x00dev);
 186 }
 187 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
 188
 189 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
 190                             struct ieee80211_vif *vif)
 191 {
 192         struct rt2x00_dev *rt2x00dev = hw->priv;
 193         struct rt2x00_intf *intf = vif_to_intf(vif);
 194         struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, QID_BEACON);
 195         struct queue_entry *entry = NULL;
 196         unsigned int i;
 197
 198         /*
 199          * Don't allow interfaces to be added
 200          * the device has disappeared.
 201          */
 202         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 203             !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 204                 return -ENODEV;
 205
 206         switch (vif->type) {
 207         case NL80211_IFTYPE_AP:
 208                 /*
 209                  * We don't support mixed combinations of
 210                  * sta and ap interfaces.
 211                  */
 212                 if (rt2x00dev->intf_sta_count)
 213                         return -ENOBUFS;
 214
 215                 /*
 216                  * Check if we exceeded the maximum amount
 217                  * of supported interfaces.
 218                  */
 219                 if (rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf)
 220                         return -ENOBUFS;
 221
 222                 break;
 223         case NL80211_IFTYPE_STATION:
 224         case NL80211_IFTYPE_ADHOC:
 225         case NL80211_IFTYPE_MESH_POINT:
 226         case NL80211_IFTYPE_WDS:
 227                 /*
 228                  * We don't support mixed combinations of
 229                  * sta and ap interfaces.
 230                  */
 231                 if (rt2x00dev->intf_ap_count)
 232                         return -ENOBUFS;
 233
 234                 /*
 235                  * Check if we exceeded the maximum amount
 236                  * of supported interfaces.
 237                  */
 238                 if (rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf)
 239                         return -ENOBUFS;
 240
 241                 break;
 242         default:
 243                 return -EINVAL;
 244         }
 245
 246         /*
 247          * Loop through all beacon queues to find a free
 248          * entry. Since there are as much beacon entries
 249          * as the maximum interfaces, this search shouldn't
 250          * fail.
 251          */
 252         for (i = 0; i < queue->limit; i++) {
 253                 entry = &queue->entries[i];
 254                 if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
 255                         break;
 256         }
 257
 258         if (unlikely(i == queue->limit))
 259                 return -ENOBUFS;
 260
 261         /*
 262          * We are now absolutely sure the interface can be created,
 263          * increase interface count and start initialization.
 264          */
 265
 266         if (vif->type == NL80211_IFTYPE_AP)
 267                 rt2x00dev->intf_ap_count++;
 268         else
 269                 rt2x00dev->intf_sta_count++;
 270
 271         spin_lock_init(&intf->lock);
 272         spin_lock_init(&intf->seqlock);
 273         mutex_init(&intf->beacon_skb_mutex);
 274         intf->beacon = entry;
 275
 276         /*
 277          * The MAC adddress must be configured after the device
 278          * has been initialized. Otherwise the device can reset
 279          * the MAC registers.
 280          * The BSSID address must only be configured in AP mode,
 281          * however we should not send an empty BSSID address for
 282          * STA interfaces at this time, since this can cause
 283          * invalid behavior in the device.
 284          */
 285         memcpy(&intf->mac, vif->addr, ETH_ALEN);
 286         rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
 287                               intf->mac, NULL);
 288
 289         /*
 290          * Some filters depend on the current working mode. We can force
 291          * an update during the next configure_filter() run by mac80211 by
 292          * resetting the current packet_filter state.
 293          */
 294         rt2x00dev->packet_filter = 0;
 295
 296         return 0;
 297 }
 298 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
 299
 300 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
 301                                 struct ieee80211_vif *vif)
 302 {
 303         struct rt2x00_dev *rt2x00dev = hw->priv;
 304         struct rt2x00_intf *intf = vif_to_intf(vif);
 305
 306         /*
 307          * Don't allow interfaces to be remove while
 308          * either the device has disappeared or when
 309          * no interface is present.
 310          */
 311         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 312             (vif->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
 313             (vif->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
 314                 return;
 315
 316         if (vif->type == NL80211_IFTYPE_AP)
 317                 rt2x00dev->intf_ap_count--;
 318         else
 319                 rt2x00dev->intf_sta_count--;
 320
 321         /*
 322          * Release beacon entry so it is available for
 323          * new interfaces again.
 324          */
 325         clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
 326
 327         /*
 328          * Make sure the bssid and mac address registers
 329          * are cleared to prevent false ACKing of frames.
 330          */
 331         rt2x00lib_config_intf(rt2x00dev, intf,
 332                               NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
 333 }
 334 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
 335
 336 int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
 337 {
 338         struct rt2x00_dev *rt2x00dev = hw->priv;
 339         struct ieee80211_conf *conf = &hw->conf;
 340
 341         /*
 342          * mac80211 might be calling this function while we are trying
 343          * to remove the device or perhaps suspending it.
 344          */
 345         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 346                 return 0;
 347
 348         /*
 349          * Some configuration parameters (e.g. channel and antenna values) can
 350          * only be set when the radio is enabled, but do require the RX to
 351          * be off. During this period we should keep link tuning enabled,
 352          * if for any reason the link tuner must be reset, this will be
 353          * handled by rt2x00lib_config().
 354          */
 355         rt2x00dev->ops->lib->stop_queue(rt2x00dev->rx);
 356
 357         /*
 358          * When we've just turned on the radio, we want to reprogram
 359          * everything to ensure a consistent state
 360          */
 361         rt2x00lib_config(rt2x00dev, conf, changed);
 362
 363         /*
 364          * After the radio has been enabled we need to configure
 365          * the antenna to the default settings. rt2x00lib_config_antenna()
 366          * should determine if any action should be taken based on
 367          * checking if diversity has been enabled or no antenna changes
 368          * have been made since the last configuration change.
 369          */
 370         rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);
 371
 372         /* Turn RX back on */
 373         rt2x00dev->ops->lib->start_queue(rt2x00dev->rx);
 374
 375         return 0;
 376 }
 377 EXPORT_SYMBOL_GPL(rt2x00mac_config);
 378
 379 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
 380                                 unsigned int changed_flags,
 381                                 unsigned int *total_flags,
 382                                 u64 multicast)
 383 {
 384         struct rt2x00_dev *rt2x00dev = hw->priv;
 385
 386         /*
 387          * Mask off any flags we are going to ignore
 388          * from the total_flags field.
 389          */
 390         *total_flags &=
 391             FIF_ALLMULTI |
 392             FIF_FCSFAIL |
 393             FIF_PLCPFAIL |
 394             FIF_CONTROL |
 395             FIF_PSPOLL |
 396             FIF_OTHER_BSS |
 397             FIF_PROMISC_IN_BSS;
 398
 399         /*
 400          * Apply some rules to the filters:
 401          * - Some filters imply different filters to be set.
 402          * - Some things we can't filter out at all.
 403          * - Multicast filter seems to kill broadcast traffic so never use it.
 404          */
 405         *total_flags |= FIF_ALLMULTI;
 406         if (*total_flags & FIF_OTHER_BSS ||
 407             *total_flags & FIF_PROMISC_IN_BSS)
 408                 *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
 409
 410         /*
 411          * If the device has a single filter for all control frames,
 412          * FIF_CONTROL and FIF_PSPOLL flags imply each other.
 413          * And if the device has more than one filter for control frames
 414          * of different types, but has no a separate filter for PS Poll frames,
 415          * FIF_CONTROL flag implies FIF_PSPOLL.
 416          */
 417         if (!test_bit(DRIVER_SUPPORT_CONTROL_FILTERS, &rt2x00dev->flags)) {
 418                 if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
 419                         *total_flags |= FIF_CONTROL | FIF_PSPOLL;
 420         }
 421         if (!test_bit(DRIVER_SUPPORT_CONTROL_FILTER_PSPOLL, &rt2x00dev->flags)) {
 422                 if (*total_flags & FIF_CONTROL)
 423                         *total_flags |= FIF_PSPOLL;
 424         }
 425
 426         /*
 427          * Check if there is any work left for us.
 428          */
 429         if (rt2x00dev->packet_filter == *total_flags)
 430                 return;
 431         rt2x00dev->packet_filter = *total_flags;
 432
 433         rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
 434 }
 435 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
 436
 437 static void rt2x00mac_set_tim_iter(void *data, u8 *mac,
 438                                    struct ieee80211_vif *vif)
 439 {
 440         struct rt2x00_intf *intf = vif_to_intf(vif);
 441
 442         if (vif->type != NL80211_IFTYPE_AP &&
 443             vif->type != NL80211_IFTYPE_ADHOC &&
 444             vif->type != NL80211_IFTYPE_MESH_POINT &&
 445             vif->type != NL80211_IFTYPE_WDS)
 446                 return;
 447
 448         spin_lock(&intf->lock);
 449         intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 450         spin_unlock(&intf->lock);
 451 }
 452
 453 int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
 454                       bool set)
 455 {
 456         struct rt2x00_dev *rt2x00dev = hw->priv;
 457
 458         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 459                 return 0;
 460
 461         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 462                                                    rt2x00mac_set_tim_iter,
 463                                                    rt2x00dev);
 464
 465         /* queue work to upodate the beacon template */
 466         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
 467         return 0;
 468 }
 469 EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);
 470
 471 #ifdef CONFIG_RT2X00_LIB_CRYPTO
 472 static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
 473 {
 474         if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
 475                 memcpy(&crypto->key,
 476                        &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
 477                        sizeof(crypto->key));
 478
 479         if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
 480                 memcpy(&crypto->tx_mic,
 481                        &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
 482                        sizeof(crypto->tx_mic));
 483
 484         if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
 485                 memcpy(&crypto->rx_mic,
 486                        &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
 487                        sizeof(crypto->rx_mic));
 488 }
 489
 490 int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 491                       struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 492                       struct ieee80211_key_conf *key)
 493 {
 494         struct rt2x00_dev *rt2x00dev = hw->priv;
 495         struct rt2x00_intf *intf = vif_to_intf(vif);
 496         int (*set_key) (struct rt2x00_dev *rt2x00dev,
 497                         struct rt2x00lib_crypto *crypto,
 498                         struct ieee80211_key_conf *key);
 499         struct rt2x00lib_crypto crypto;
 500         static const u8 bcast_addr[ETH_ALEN] =
 501                 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
 502
 503         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 504                 return 0;
 505         else if (!test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 506                 return -EOPNOTSUPP;
 507         else if (key->keylen > 32)
 508                 return -ENOSPC;
 509
 510         memset(&crypto, 0, sizeof(crypto));
 511
 512         /*
 513          * When in STA mode, bssidx is always 0 otherwise local_address[5]
 514          * contains the bss number, see BSS_ID_MASK comments for details.
 515          */
 516         if (rt2x00dev->intf_sta_count)
 517                 crypto.bssidx = 0;
 518         else
 519                 crypto.bssidx = intf->mac[5] & (rt2x00dev->ops->max_ap_intf - 1);
 520
 521         crypto.cipher = rt2x00crypto_key_to_cipher(key);
 522         if (crypto.cipher == CIPHER_NONE)
 523                 return -EOPNOTSUPP;
 524
 525         crypto.cmd = cmd;
 526
 527         if (sta) {
 528                 /* some drivers need the AID */
 529                 crypto.aid = sta->aid;
 530                 crypto.address = sta->addr;
 531         } else
 532                 crypto.address = bcast_addr;
 533
 534         if (crypto.cipher == CIPHER_TKIP)
 535                 memcpy_tkip(&crypto, &key->key[0], key->keylen);
 536         else
 537                 memcpy(&crypto.key, &key->key[0], key->keylen);
 538         /*
 539          * Each BSS has a maximum of 4 shared keys.
 540          * Shared key index values:
 541          *      0) BSS0 key0
 542          *      1) BSS0 key1
 543          *      ...
 544          *      4) BSS1 key0
 545          *      ...
 546          *      8) BSS2 key0
 547          *      ...
 548          * Both pairwise as shared key indeces are determined by
 549          * driver. This is required because the hardware requires
 550          * keys to be assigned in correct order (When key 1 is
 551          * provided but key 0 is not, then the key is not found
 552          * by the hardware during RX).
 553          */
 554         if (cmd == SET_KEY)
 555                 key->hw_key_idx = 0;
 556
 557         if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
 558                 set_key = rt2x00dev->ops->lib->config_pairwise_key;
 559         else
 560                 set_key = rt2x00dev->ops->lib->config_shared_key;
 561
 562         if (!set_key)
 563                 return -EOPNOTSUPP;
 564
 565         return set_key(rt2x00dev, &crypto, key);
 566 }
 567 EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
 568 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
 569
 570 void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw)
 571 {
 572         struct rt2x00_dev *rt2x00dev = hw->priv;
 573         __set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
 574         rt2x00link_stop_tuner(rt2x00dev);
 575 }
 576 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);
 577
 578 void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw)
 579 {
 580         struct rt2x00_dev *rt2x00dev = hw->priv;
 581         __clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
 582         rt2x00link_start_tuner(rt2x00dev);
 583 }
 584 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);
 585
 586 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
 587                         struct ieee80211_low_level_stats *stats)
 588 {
 589         struct rt2x00_dev *rt2x00dev = hw->priv;
 590
 591         /*
 592          * The dot11ACKFailureCount, dot11RTSFailureCount and
 593          * dot11RTSSuccessCount are updated in interrupt time.
 594          * dot11FCSErrorCount is updated in the link tuner.
 595          */
 596         memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
 597
 598         return 0;
 599 }
 600 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
 601
 602 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
 603                                 struct ieee80211_vif *vif,
 604                                 struct ieee80211_bss_conf *bss_conf,
 605                                 u32 changes)
 606 {
 607         struct rt2x00_dev *rt2x00dev = hw->priv;
 608         struct rt2x00_intf *intf = vif_to_intf(vif);
 609
 610         /*
 611          * mac80211 might be calling this function while we are trying
 612          * to remove the device or perhaps suspending it.
 613          */
 614         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 615                 return;
 616
 617         spin_lock(&intf->lock);
 618
 619         /*
 620          * conf->bssid can be NULL if coming from the internal
 621          * beacon update routine.
 622          */
 623         if (changes & BSS_CHANGED_BSSID)
 624                 memcpy(&intf->bssid, bss_conf->bssid, ETH_ALEN);
 625
 626         spin_unlock(&intf->lock);
 627
 628         /*
 629          * Call rt2x00_config_intf() outside of the spinlock context since
 630          * the call will sleep for USB drivers. By using the ieee80211_if_conf
 631          * values as arguments we make keep access to rt2x00_intf thread safe
 632          * even without the lock.
 633          */
 634         if (changes & BSS_CHANGED_BSSID)
 635                 rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
 636                                       bss_conf->bssid);
 637
 638         /*
 639          * Update the beacon.
 640          */
 641         if (changes & (BSS_CHANGED_BEACON | BSS_CHANGED_BEACON_ENABLED))
 642                 rt2x00queue_update_beacon(rt2x00dev, vif,
 643                                           bss_conf->enable_beacon);
 644
 645         /*
 646          * When the association status has changed we must reset the link
 647          * tuner counter. This is because some drivers determine if they
 648          * should perform link tuning based on the number of seconds
 649          * while associated or not associated.
 650          */
 651         if (changes & BSS_CHANGED_ASSOC) {
 652                 rt2x00dev->link.count = 0;
 653
 654                 if (bss_conf->assoc)
 655                         rt2x00dev->intf_associated++;
 656                 else
 657                         rt2x00dev->intf_associated--;
 658
 659                 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 660         }
 661
 662         /*
 663          * When the erp information has changed, we should perform
 664          * additional configuration steps. For all other changes we are done.
 665          */
 666         if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
 667                        BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
 668                        BSS_CHANGED_BEACON_INT | BSS_CHANGED_HT))
 669                 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
 670 }
 671 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
 672
 673 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 queue_idx,
 674                       const struct ieee80211_tx_queue_params *params)
 675 {
 676         struct rt2x00_dev *rt2x00dev = hw->priv;
 677         struct data_queue *queue;
 678
 679         queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
 680         if (unlikely(!queue))
 681                 return -EINVAL;
 682
 683         /*
 684          * The passed variables are stored as real value ((2^n)-1).
 685          * Ralink registers require to know the bit number 'n'.
 686          */
 687         if (params->cw_min > 0)
 688                 queue->cw_min = fls(params->cw_min);
 689         else
 690                 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
 691
 692         if (params->cw_max > 0)
 693                 queue->cw_max = fls(params->cw_max);
 694         else
 695                 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
 696
 697         queue->aifs = params->aifs;
 698         queue->txop = params->txop;
 699
 700         INFO(rt2x00dev,
 701              "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d.\n",
 702              queue_idx, queue->cw_min, queue->cw_max, queue->aifs, queue->txop);
 703
 704         return 0;
 705 }
 706 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
 707
 708 void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
 709 {
 710         struct rt2x00_dev *rt2x00dev = hw->priv;
 711         bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
 712
 713         wiphy_rfkill_set_hw_state(hw->wiphy, !active);
 714 }
 715 EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);
 716
 717 void rt2x00mac_flush(struct ieee80211_hw *hw, bool drop)
 718 {
 719         struct rt2x00_dev *rt2x00dev = hw->priv;
 720         struct data_queue *queue;
 721         unsigned int i = 0;
 722
 723         ieee80211_stop_queues(hw);
 724
 725         /*
 726          * Run over all queues to kick them, this will force
 727          * any pending frames to be transmitted.
 728          */
 729         tx_queue_for_each(rt2x00dev, queue) {
 730                 rt2x00dev->ops->lib->kick_queue(queue);
 731         }
 732
 733         /**
 734          * All queues have been kicked, now wait for each queue
 735          * to become empty. With a bit of luck, we only have to wait
 736          * for the first queue to become empty, because while waiting
 737          * for the that queue, the other queues will have transmitted
 738          * all their frames as well (since they were already kicked).
 739          */
 740         tx_queue_for_each(rt2x00dev, queue) {
 741                 for (i = 0; i < 10; i++) {
 742                         if (rt2x00queue_empty(queue))
 743                                 break;
 744                         msleep(100);
 745                 }
 746
 747                 if (!rt2x00queue_empty(queue))
 748                         WARNING(rt2x00dev, "Failed to flush queue %d\n", queue->qid);
 749         }
 750
 751         ieee80211_wake_queues(hw);
 752 }
 753 EXPORT_SYMBOL_GPL(rt2x00mac_flush);