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         struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
 107         enum data_queue_qid qid = skb_get_queue_mapping(skb);
 108         struct data_queue *queue;
 109         u16 frame_control;
 110
 111         /*
 112          * Mac80211 might be calling this function while we are trying
 113          * to remove the device or perhaps suspending it.
 114          * Note that we can only stop the TX queues inside the TX path
 115          * due to possible race conditions in mac80211.
 116          */
 117         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 118                 goto exit_fail;
 119
 120         /*
 121          * Determine which queue to put packet on.
 122          */
 123         if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
 124             test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
 125                 queue = rt2x00queue_get_queue(rt2x00dev, QID_ATIM);
 126         else
 127                 queue = rt2x00queue_get_queue(rt2x00dev, qid);
 128         if (unlikely(!queue)) {
 129                 ERROR(rt2x00dev,
 130                       "Attempt to send packet over invalid queue %d.\n"
 131                       "Please file bug report to %s.\n", qid, DRV_PROJECT);
 132                 goto exit_fail;
 133         }
 134
 135         /*
 136          * If CTS/RTS is required. create and queue that frame first.
 137          * Make sure we have at least enough entries available to send
 138          * this CTS/RTS frame as well as the data frame.
 139          * Note that when the driver has set the set_rts_threshold()
 140          * callback function it doesn't need software generation of
 141          * either RTS or CTS-to-self frame and handles everything
 142          * inside the hardware.
 143          */
 144         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 145         if ((tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS |
 146                                                 IEEE80211_TX_RC_USE_CTS_PROTECT)) &&
 147             !rt2x00dev->ops->hw->set_rts_threshold) {
 148                 if (rt2x00queue_available(queue) <= 1)
 149                         goto exit_fail;
 150
 151                 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
 152                         goto exit_fail;
 153         }
 154
 155         if (rt2x00queue_write_tx_frame(queue, skb, false))
 156                 goto exit_fail;
 157
 158         if (rt2x00queue_threshold(queue))
 159                 ieee80211_stop_queue(rt2x00dev->hw, qid);
 160
 161         return NETDEV_TX_OK;
 162
 163  exit_fail:
 164         ieee80211_stop_queue(rt2x00dev->hw, qid);
 165         dev_kfree_skb_any(skb);
 166         return NETDEV_TX_OK;
 167 }
 168 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
 169
 170 int rt2x00mac_start(struct ieee80211_hw *hw)
 171 {
 172         struct rt2x00_dev *rt2x00dev = hw->priv;
 173
 174         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 175                 return 0;
 176
 177         return rt2x00lib_start(rt2x00dev);
 178 }
 179 EXPORT_SYMBOL_GPL(rt2x00mac_start);
 180
 181 void rt2x00mac_stop(struct ieee80211_hw *hw)
 182 {
 183         struct rt2x00_dev *rt2x00dev = hw->priv;
 184
 185         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 186                 return;
 187
 188         rt2x00lib_stop(rt2x00dev);
 189 }
 190 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
 191
 192 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
 193                             struct ieee80211_if_init_conf *conf)
 194 {
 195         struct rt2x00_dev *rt2x00dev = hw->priv;
 196         struct rt2x00_intf *intf = vif_to_intf(conf->vif);
 197         struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, QID_BEACON);
 198         struct queue_entry *entry = NULL;
 199         unsigned int i;
 200
 201         /*
 202          * Don't allow interfaces to be added
 203          * the device has disappeared.
 204          */
 205         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 206             !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 207                 return -ENODEV;
 208
 209         switch (conf->type) {
 210         case NL80211_IFTYPE_AP:
 211                 /*
 212                  * We don't support mixed combinations of
 213                  * sta and ap interfaces.
 214                  */
 215                 if (rt2x00dev->intf_sta_count)
 216                         return -ENOBUFS;
 217
 218                 /*
 219                  * Check if we exceeded the maximum amount
 220                  * of supported interfaces.
 221                  */
 222                 if (rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf)
 223                         return -ENOBUFS;
 224
 225                 break;
 226         case NL80211_IFTYPE_STATION:
 227         case NL80211_IFTYPE_ADHOC:
 228         case NL80211_IFTYPE_MESH_POINT:
 229         case NL80211_IFTYPE_WDS:
 230                 /*
 231                  * We don't support mixed combinations of
 232                  * sta and ap interfaces.
 233                  */
 234                 if (rt2x00dev->intf_ap_count)
 235                         return -ENOBUFS;
 236
 237                 /*
 238                  * Check if we exceeded the maximum amount
 239                  * of supported interfaces.
 240                  */
 241                 if (rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf)
 242                         return -ENOBUFS;
 243
 244                 break;
 245         default:
 246                 return -EINVAL;
 247         }
 248
 249         /*
 250          * Loop through all beacon queues to find a free
 251          * entry. Since there are as much beacon entries
 252          * as the maximum interfaces, this search shouldn't
 253          * fail.
 254          */
 255         for (i = 0; i < queue->limit; i++) {
 256                 entry = &queue->entries[i];
 257                 if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
 258                         break;
 259         }
 260
 261         if (unlikely(i == queue->limit))
 262                 return -ENOBUFS;
 263
 264         /*
 265          * We are now absolutely sure the interface can be created,
 266          * increase interface count and start initialization.
 267          */
 268
 269         if (conf->type == NL80211_IFTYPE_AP)
 270                 rt2x00dev->intf_ap_count++;
 271         else
 272                 rt2x00dev->intf_sta_count++;
 273
 274         spin_lock_init(&intf->lock);
 275         spin_lock_init(&intf->seqlock);
 276         mutex_init(&intf->beacon_skb_mutex);
 277         intf->beacon = entry;
 278
 279         if (conf->type == NL80211_IFTYPE_AP)
 280                 memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
 281         memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
 282
 283         /*
 284          * The MAC adddress must be configured after the device
 285          * has been initialized. Otherwise the device can reset
 286          * the MAC registers.
 287          */
 288         rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);
 289
 290         /*
 291          * Some filters depend on the current working mode. We can force
 292          * an update during the next configure_filter() run by mac80211 by
 293          * resetting the current packet_filter state.
 294          */
 295         rt2x00dev->packet_filter = 0;
 296
 297         return 0;
 298 }
 299 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
 300
 301 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
 302                                 struct ieee80211_if_init_conf *conf)
 303 {
 304         struct rt2x00_dev *rt2x00dev = hw->priv;
 305         struct rt2x00_intf *intf = vif_to_intf(conf->vif);
 306
 307         /*
 308          * Don't allow interfaces to be remove while
 309          * either the device has disappeared or when
 310          * no interface is present.
 311          */
 312         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 313             (conf->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
 314             (conf->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
 315                 return;
 316
 317         if (conf->type == NL80211_IFTYPE_AP)
 318                 rt2x00dev->intf_ap_count--;
 319         else
 320                 rt2x00dev->intf_sta_count--;
 321
 322         /*
 323          * Release beacon entry so it is available for
 324          * new interfaces again.
 325          */
 326         clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
 327
 328         /*
 329          * Make sure the bssid and mac address registers
 330          * are cleared to prevent false ACKing of frames.
 331          */
 332         rt2x00lib_config_intf(rt2x00dev, intf,
 333                               NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
 334 }
 335 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
 336
 337 int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
 338 {
 339         struct rt2x00_dev *rt2x00dev = hw->priv;
 340         struct ieee80211_conf *conf = &hw->conf;
 341
 342         /*
 343          * mac80211 might be calling this function while we are trying
 344          * to remove the device or perhaps suspending it.
 345          */
 346         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 347                 return 0;
 348
 349         /*
 350          * Some configuration parameters (e.g. channel and antenna values) can
 351          * only be set when the radio is enabled, but do require the RX to
 352          * be off.
 353          */
 354         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 355
 356         /*
 357          * When we've just turned on the radio, we want to reprogram
 358          * everything to ensure a consistent state
 359          */
 360         rt2x00lib_config(rt2x00dev, conf, changed);
 361
 362         /*
 363          * After the radio has been enabled we need to configure
 364          * the antenna to the default settings. rt2x00lib_config_antenna()
 365          * should determine if any action should be taken based on
 366          * checking if diversity has been enabled or no antenna changes
 367          * have been made since the last configuration change.
 368          */
 369         rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);
 370
 371         /* Turn RX back on */
 372         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 373
 374         return 0;
 375 }
 376 EXPORT_SYMBOL_GPL(rt2x00mac_config);
 377
 378 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
 379                                 unsigned int changed_flags,
 380                                 unsigned int *total_flags,
 381                                 u64 multicast)
 382 {
 383         struct rt2x00_dev *rt2x00dev = hw->priv;
 384
 385         /*
 386          * Mask off any flags we are going to ignore
 387          * from the total_flags field.
 388          */
 389         *total_flags &=
 390             FIF_ALLMULTI |
 391             FIF_FCSFAIL |
 392             FIF_PLCPFAIL |
 393             FIF_CONTROL |
 394             FIF_PSPOLL |
 395             FIF_OTHER_BSS |
 396             FIF_PROMISC_IN_BSS;
 397
 398         /*
 399          * Apply some rules to the filters:
 400          * - Some filters imply different filters to be set.
 401          * - Some things we can't filter out at all.
 402          * - Multicast filter seems to kill broadcast traffic so never use it.
 403          */
 404         *total_flags |= FIF_ALLMULTI;
 405         if (*total_flags & FIF_OTHER_BSS ||
 406             *total_flags & FIF_PROMISC_IN_BSS)
 407                 *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
 408
 409         /*
 410          * If the device has a single filter for all control frames,
 411          * FIF_CONTROL and FIF_PSPOLL flags imply each other.
 412          * And if the device has more than one filter for control frames
 413          * of different types, but has no a separate filter for PS Poll frames,
 414          * FIF_CONTROL flag implies FIF_PSPOLL.
 415          */
 416         if (!test_bit(DRIVER_SUPPORT_CONTROL_FILTERS, &rt2x00dev->flags)) {
 417                 if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
 418                         *total_flags |= FIF_CONTROL | FIF_PSPOLL;
 419         }
 420         if (!test_bit(DRIVER_SUPPORT_CONTROL_FILTER_PSPOLL, &rt2x00dev->flags)) {
 421                 if (*total_flags & FIF_CONTROL)
 422                         *total_flags |= FIF_PSPOLL;
 423         }
 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         rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
 433 }
 434 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
 435
 436 int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
 437                       bool set)
 438 {
 439         struct rt2x00_dev *rt2x00dev = hw->priv;
 440
 441         rt2x00lib_beacondone(rt2x00dev);
 442         return 0;
 443 }
 444 EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);
 445
 446 #ifdef CONFIG_RT2X00_LIB_CRYPTO
 447 static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
 448 {
 449         if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
 450                 memcpy(&crypto->key,
 451                        &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
 452                        sizeof(crypto->key));
 453
 454         if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
 455                 memcpy(&crypto->tx_mic,
 456                        &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
 457                        sizeof(crypto->tx_mic));
 458
 459         if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
 460                 memcpy(&crypto->rx_mic,
 461                        &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
 462                        sizeof(crypto->rx_mic));
 463 }
 464
 465 int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 466                       struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 467                       struct ieee80211_key_conf *key)
 468 {
 469         struct rt2x00_dev *rt2x00dev = hw->priv;
 470         struct rt2x00_intf *intf = vif_to_intf(vif);
 471         int (*set_key) (struct rt2x00_dev *rt2x00dev,
 472                         struct rt2x00lib_crypto *crypto,
 473                         struct ieee80211_key_conf *key);
 474         struct rt2x00lib_crypto crypto;
 475         static const u8 bcast_addr[ETH_ALEN] =
 476                 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
 477
 478         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 479                 return 0;
 480         else if (!test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 481                 return -EOPNOTSUPP;
 482         else if (key->keylen > 32)
 483                 return -ENOSPC;
 484
 485         memset(&crypto, 0, sizeof(crypto));
 486
 487         /*
 488          * When in STA mode, bssidx is always 0 otherwise local_address[5]
 489          * contains the bss number, see BSS_ID_MASK comments for details.
 490          */
 491         if (rt2x00dev->intf_sta_count)
 492                 crypto.bssidx = 0;
 493         else
 494                 crypto.bssidx = intf->mac[5] & (rt2x00dev->ops->max_ap_intf - 1);
 495
 496         crypto.cipher = rt2x00crypto_key_to_cipher(key);
 497         if (crypto.cipher == CIPHER_NONE)
 498                 return -EOPNOTSUPP;
 499
 500         crypto.cmd = cmd;
 501
 502         if (sta) {
 503                 /* some drivers need the AID */
 504                 crypto.aid = sta->aid;
 505                 crypto.address = sta->addr;
 506         } else
 507                 crypto.address = bcast_addr;
 508
 509         if (crypto.cipher == CIPHER_TKIP)
 510                 memcpy_tkip(&crypto, &key->key[0], key->keylen);
 511         else
 512                 memcpy(&crypto.key, &key->key[0], key->keylen);
 513         /*
 514          * Each BSS has a maximum of 4 shared keys.
 515          * Shared key index values:
 516          *      0) BSS0 key0
 517          *      1) BSS0 key1
 518          *      ...
 519          *      4) BSS1 key0
 520          *      ...
 521          *      8) BSS2 key0
 522          *      ...
 523          * Both pairwise as shared key indeces are determined by
 524          * driver. This is required because the hardware requires
 525          * keys to be assigned in correct order (When key 1 is
 526          * provided but key 0 is not, then the key is not found
 527          * by the hardware during RX).
 528          */
 529         if (cmd == SET_KEY)
 530                 key->hw_key_idx = 0;
 531
 532         if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
 533                 set_key = rt2x00dev->ops->lib->config_pairwise_key;
 534         else
 535                 set_key = rt2x00dev->ops->lib->config_shared_key;
 536
 537         if (!set_key)
 538                 return -EOPNOTSUPP;
 539
 540         return set_key(rt2x00dev, &crypto, key);
 541 }
 542 EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
 543 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
 544
 545 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
 546                         struct ieee80211_low_level_stats *stats)
 547 {
 548         struct rt2x00_dev *rt2x00dev = hw->priv;
 549
 550         /*
 551          * The dot11ACKFailureCount, dot11RTSFailureCount and
 552          * dot11RTSSuccessCount are updated in interrupt time.
 553          * dot11FCSErrorCount is updated in the link tuner.
 554          */
 555         memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
 556
 557         return 0;
 558 }
 559 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
 560
 561 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
 562                            struct ieee80211_tx_queue_stats *stats)
 563 {
 564         struct rt2x00_dev *rt2x00dev = hw->priv;
 565         unsigned int i;
 566
 567         for (i = 0; i < rt2x00dev->ops->tx_queues; i++) {
 568                 stats[i].len = rt2x00dev->tx[i].length;
 569                 stats[i].limit = rt2x00dev->tx[i].limit;
 570                 stats[i].count = rt2x00dev->tx[i].count;
 571         }
 572
 573         return 0;
 574 }
 575 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
 576
 577 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
 578                                 struct ieee80211_vif *vif,
 579                                 struct ieee80211_bss_conf *bss_conf,
 580                                 u32 changes)
 581 {
 582         struct rt2x00_dev *rt2x00dev = hw->priv;
 583         struct rt2x00_intf *intf = vif_to_intf(vif);
 584         int update_bssid = 0;
 585
 586         /*
 587          * mac80211 might be calling this function while we are trying
 588          * to remove the device or perhaps suspending it.
 589          */
 590         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 591                 return;
 592
 593         spin_lock(&intf->lock);
 594
 595         /*
 596          * conf->bssid can be NULL if coming from the internal
 597          * beacon update routine.
 598          */
 599         if (changes & BSS_CHANGED_BSSID) {
 600                 update_bssid = 1;
 601                 memcpy(&intf->bssid, bss_conf->bssid, ETH_ALEN);
 602         }
 603
 604         spin_unlock(&intf->lock);
 605
 606         /*
 607          * Call rt2x00_config_intf() outside of the spinlock context since
 608          * the call will sleep for USB drivers. By using the ieee80211_if_conf
 609          * values as arguments we make keep access to rt2x00_intf thread safe
 610          * even without the lock.
 611          */
 612         if (changes & BSS_CHANGED_BSSID)
 613                 rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
 614                                       update_bssid ? bss_conf->bssid : NULL);
 615
 616         /*
 617          * Update the beacon.
 618          */
 619         if (changes & (BSS_CHANGED_BEACON | BSS_CHANGED_BEACON_ENABLED))
 620                 rt2x00queue_update_beacon(rt2x00dev, vif,
 621                                           bss_conf->enable_beacon);
 622
 623         /*
 624          * When the association status has changed we must reset the link
 625          * tuner counter. This is because some drivers determine if they
 626          * should perform link tuning based on the number of seconds
 627          * while associated or not associated.
 628          */
 629         if (changes & BSS_CHANGED_ASSOC) {
 630                 rt2x00dev->link.count = 0;
 631
 632                 if (bss_conf->assoc)
 633                         rt2x00dev->intf_associated++;
 634                 else
 635                         rt2x00dev->intf_associated--;
 636
 637                 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 638         }
 639
 640         /*
 641          * When the erp information has changed, we should perform
 642          * additional configuration steps. For all other changes we are done.
 643          */
 644         if (changes & ~(BSS_CHANGED_ASSOC | BSS_CHANGED_HT))
 645                 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);
 646 }
 647 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
 648
 649 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 queue_idx,
 650                       const struct ieee80211_tx_queue_params *params)
 651 {
 652         struct rt2x00_dev *rt2x00dev = hw->priv;
 653         struct data_queue *queue;
 654
 655         queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
 656         if (unlikely(!queue))
 657                 return -EINVAL;
 658
 659         /*
 660          * The passed variables are stored as real value ((2^n)-1).
 661          * Ralink registers require to know the bit number 'n'.
 662          */
 663         if (params->cw_min > 0)
 664                 queue->cw_min = fls(params->cw_min);
 665         else
 666                 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
 667
 668         if (params->cw_max > 0)
 669                 queue->cw_max = fls(params->cw_max);
 670         else
 671                 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
 672
 673         queue->aifs = params->aifs;
 674         queue->txop = params->txop;
 675
 676         INFO(rt2x00dev,
 677              "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d.\n",
 678              queue_idx, queue->cw_min, queue->cw_max, queue->aifs, queue->txop);
 679
 680         return 0;
 681 }
 682 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
 683
 684 void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
 685 {
 686         struct rt2x00_dev *rt2x00dev = hw->priv;
 687         bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
 688
 689         wiphy_rfkill_set_hw_state(hw->wiphy, !active);
 690 }
 691 EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);