root/drivers/net/wireless/ralink/rt2x00/rt2x00mac.c

DEFINITIONS

1. rt2x00mac_tx_rts_cts
2. rt2x00mac_tx
3. rt2x00mac_start
4. rt2x00mac_stop
5. rt2x00mac_add_interface
6. rt2x00mac_remove_interface
7. rt2x00mac_config
8. rt2x00mac_configure_filter
9. rt2x00mac_set_tim_iter
10. rt2x00mac_set_tim
11. memcpy_tkip
12. rt2x00mac_set_key
13. rt2x00mac_sw_scan_start
14. rt2x00mac_sw_scan_complete
15. rt2x00mac_get_stats
16. rt2x00mac_bss_info_changed
17. rt2x00mac_conf_tx
18. rt2x00mac_rfkill_poll
19. rt2x00mac_flush
20. rt2x00mac_set_antenna
21. rt2x00mac_get_antenna
22. rt2x00mac_get_ringparam
23. rt2x00mac_tx_frames_pending

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3         Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
   4         <http://rt2x00.serialmonkey.com>
   5 
   6  */
   7 
   8 /*
   9         Module: rt2x00mac
  10         Abstract: rt2x00 generic mac80211 routines.
  11  */
  12 
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 
  16 #include "rt2x00.h"
  17 #include "rt2x00lib.h"
  18 
  19 static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
  20                                 struct data_queue *queue,
  21                                 struct sk_buff *frag_skb)
  22 {
  23         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(frag_skb);
  24         struct ieee80211_tx_info *rts_info;
  25         struct sk_buff *skb;
  26         unsigned int data_length;
  27         int retval = 0;
  28 
  29         if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
  30                 data_length = sizeof(struct ieee80211_cts);
  31         else
  32                 data_length = sizeof(struct ieee80211_rts);
  33 
  34         skb = dev_alloc_skb(data_length + rt2x00dev->hw->extra_tx_headroom);
  35         if (unlikely(!skb)) {
  36                 rt2x00_warn(rt2x00dev, "Failed to create RTS/CTS frame\n");
  37                 return -ENOMEM;
  38         }
  39 
  40         skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
  41         skb_put(skb, data_length);
  42 
  43         /*
  44          * Copy TX information over from original frame to
  45          * RTS/CTS frame. Note that we set the no encryption flag
  46          * since we don't want this frame to be encrypted.
  47          * RTS frames should be acked, while CTS-to-self frames
  48          * should not. The ready for TX flag is cleared to prevent
  49          * it being automatically send when the descriptor is
  50          * written to the hardware.
  51          */
  52         memcpy(skb->cb, frag_skb->cb, sizeof(skb->cb));
  53         rts_info = IEEE80211_SKB_CB(skb);
  54         rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_RTS_CTS;
  55         rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_CTS_PROTECT;
  56 
  57         if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
  58                 rts_info->flags |= IEEE80211_TX_CTL_NO_ACK;
  59         else
  60                 rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
  61 
  62         /* Disable hardware encryption */
  63         rts_info->control.hw_key = NULL;
  64 
  65         /*
  66          * RTS/CTS frame should use the length of the frame plus any
  67          * encryption overhead that will be added by the hardware.
  68          */
  69         data_length += rt2x00crypto_tx_overhead(rt2x00dev, skb);
  70 
  71         if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
  72                 ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,
  73                                         frag_skb->data, data_length, tx_info,
  74                                         (struct ieee80211_cts *)(skb->data));
  75         else
  76                 ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
  77                                   frag_skb->data, data_length, tx_info,
  78                                   (struct ieee80211_rts *)(skb->data));
  79 
  80         retval = rt2x00queue_write_tx_frame(queue, skb, NULL, true);
  81         if (retval) {
  82                 dev_kfree_skb_any(skb);
  83                 rt2x00_warn(rt2x00dev, "Failed to send RTS/CTS frame\n");
  84         }
  85 
  86         return retval;
  87 }
  88 
  89 void rt2x00mac_tx(struct ieee80211_hw *hw,
  90                   struct ieee80211_tx_control *control,
  91                   struct sk_buff *skb)
  92 {
  93         struct rt2x00_dev *rt2x00dev = hw->priv;
  94         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
  95         enum data_queue_qid qid = skb_get_queue_mapping(skb);
  96         struct data_queue *queue = NULL;
  97 
  98         /*
  99          * Mac80211 might be calling this function while we are trying
 100          * to remove the device or perhaps suspending it.
 101          * Note that we can only stop the TX queues inside the TX path
 102          * due to possible race conditions in mac80211.
 103          */
 104         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 105                 goto exit_free_skb;
 106 
 107         /*
 108          * Use the ATIM queue if appropriate and present.
 109          */
 110         if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
 111             rt2x00_has_cap_flag(rt2x00dev, REQUIRE_ATIM_QUEUE))
 112                 qid = QID_ATIM;
 113 
 114         queue = rt2x00queue_get_tx_queue(rt2x00dev, qid);
 115         if (unlikely(!queue)) {
 116                 rt2x00_err(rt2x00dev,
 117                            "Attempt to send packet over invalid queue %d\n"
 118                            "Please file bug report to %s\n", qid, DRV_PROJECT);
 119                 goto exit_free_skb;
 120         }
 121 
 122         /*
 123          * If CTS/RTS is required. create and queue that frame first.
 124          * Make sure we have at least enough entries available to send
 125          * this CTS/RTS frame as well as the data frame.
 126          * Note that when the driver has set the set_rts_threshold()
 127          * callback function it doesn't need software generation of
 128          * either RTS or CTS-to-self frame and handles everything
 129          * inside the hardware.
 130          */
 131         if (!rt2x00dev->ops->hw->set_rts_threshold &&
 132             (tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS |
 133                                                 IEEE80211_TX_RC_USE_CTS_PROTECT))) {
 134                 if (rt2x00queue_available(queue) <= 1) {
 135                         /*
 136                          * Recheck for full queue under lock to avoid race
 137                          * conditions with rt2x00lib_txdone().
 138                          */
 139                         spin_lock(&queue->tx_lock);
 140                         if (rt2x00queue_threshold(queue))
 141                                 rt2x00queue_pause_queue(queue);
 142                         spin_unlock(&queue->tx_lock);
 143 
 144                         goto exit_free_skb;
 145                 }
 146 
 147                 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
 148                         goto exit_free_skb;
 149         }
 150 
 151         if (unlikely(rt2x00queue_write_tx_frame(queue, skb, control->sta, false)))
 152                 goto exit_free_skb;
 153 
 154         return;
 155 
 156  exit_free_skb:
 157         ieee80211_free_txskb(hw, skb);
 158 }
 159 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
 160 
 161 int rt2x00mac_start(struct ieee80211_hw *hw)
 162 {
 163         struct rt2x00_dev *rt2x00dev = hw->priv;
 164 
 165         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 166                 return 0;
 167 
 168         return rt2x00lib_start(rt2x00dev);
 169 }
 170 EXPORT_SYMBOL_GPL(rt2x00mac_start);
 171 
 172 void rt2x00mac_stop(struct ieee80211_hw *hw)
 173 {
 174         struct rt2x00_dev *rt2x00dev = hw->priv;
 175 
 176         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 177                 return;
 178 
 179         rt2x00lib_stop(rt2x00dev);
 180 }
 181 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
 182 
 183 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
 184                             struct ieee80211_vif *vif)
 185 {
 186         struct rt2x00_dev *rt2x00dev = hw->priv;
 187         struct rt2x00_intf *intf = vif_to_intf(vif);
 188         struct data_queue *queue = rt2x00dev->bcn;
 189         struct queue_entry *entry = NULL;
 190         unsigned int i;
 191 
 192         /*
 193          * Don't allow interfaces to be added
 194          * the device has disappeared.
 195          */
 196         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 197             !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 198                 return -ENODEV;
 199 
 200         /*
 201          * Loop through all beacon queues to find a free
 202          * entry. Since there are as much beacon entries
 203          * as the maximum interfaces, this search shouldn't
 204          * fail.
 205          */
 206         for (i = 0; i < queue->limit; i++) {
 207                 entry = &queue->entries[i];
 208                 if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
 209                         break;
 210         }
 211 
 212         if (unlikely(i == queue->limit))
 213                 return -ENOBUFS;
 214 
 215         /*
 216          * We are now absolutely sure the interface can be created,
 217          * increase interface count and start initialization.
 218          */
 219 
 220         if (vif->type == NL80211_IFTYPE_AP)
 221                 rt2x00dev->intf_ap_count++;
 222         else
 223                 rt2x00dev->intf_sta_count++;
 224 
 225         mutex_init(&intf->beacon_skb_mutex);
 226         intf->beacon = entry;
 227 
 228         /*
 229          * The MAC address must be configured after the device
 230          * has been initialized. Otherwise the device can reset
 231          * the MAC registers.
 232          * The BSSID address must only be configured in AP mode,
 233          * however we should not send an empty BSSID address for
 234          * STA interfaces at this time, since this can cause
 235          * invalid behavior in the device.
 236          */
 237         rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
 238                               vif->addr, NULL);
 239 
 240         /*
 241          * Some filters depend on the current working mode. We can force
 242          * an update during the next configure_filter() run by mac80211 by
 243          * resetting the current packet_filter state.
 244          */
 245         rt2x00dev->packet_filter = 0;
 246 
 247         return 0;
 248 }
 249 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
 250 
 251 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
 252                                 struct ieee80211_vif *vif)
 253 {
 254         struct rt2x00_dev *rt2x00dev = hw->priv;
 255         struct rt2x00_intf *intf = vif_to_intf(vif);
 256 
 257         /*
 258          * Don't allow interfaces to be remove while
 259          * either the device has disappeared or when
 260          * no interface is present.
 261          */
 262         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 263             (vif->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
 264             (vif->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
 265                 return;
 266 
 267         if (vif->type == NL80211_IFTYPE_AP)
 268                 rt2x00dev->intf_ap_count--;
 269         else
 270                 rt2x00dev->intf_sta_count--;
 271 
 272         /*
 273          * Release beacon entry so it is available for
 274          * new interfaces again.
 275          */
 276         clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
 277 
 278         /*
 279          * Make sure the bssid and mac address registers
 280          * are cleared to prevent false ACKing of frames.
 281          */
 282         rt2x00lib_config_intf(rt2x00dev, intf,
 283                               NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
 284 }
 285 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
 286 
 287 int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
 288 {
 289         struct rt2x00_dev *rt2x00dev = hw->priv;
 290         struct ieee80211_conf *conf = &hw->conf;
 291 
 292         /*
 293          * mac80211 might be calling this function while we are trying
 294          * to remove the device or perhaps suspending it.
 295          */
 296         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 297                 return 0;
 298 
 299         /*
 300          * Some configuration parameters (e.g. channel and antenna values) can
 301          * only be set when the radio is enabled, but do require the RX to
 302          * be off. During this period we should keep link tuning enabled,
 303          * if for any reason the link tuner must be reset, this will be
 304          * handled by rt2x00lib_config().
 305          */
 306         rt2x00queue_stop_queue(rt2x00dev->rx);
 307 
 308         /* Do not race with with link tuner. */
 309         mutex_lock(&rt2x00dev->conf_mutex);
 310 
 311         /*
 312          * When we've just turned on the radio, we want to reprogram
 313          * everything to ensure a consistent state
 314          */
 315         rt2x00lib_config(rt2x00dev, conf, changed);
 316 
 317         /*
 318          * After the radio has been enabled we need to configure
 319          * the antenna to the default settings. rt2x00lib_config_antenna()
 320          * should determine if any action should be taken based on
 321          * checking if diversity has been enabled or no antenna changes
 322          * have been made since the last configuration change.
 323          */
 324         rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);
 325 
 326         mutex_unlock(&rt2x00dev->conf_mutex);
 327 
 328         /* Turn RX back on */
 329         rt2x00queue_start_queue(rt2x00dev->rx);
 330 
 331         return 0;
 332 }
 333 EXPORT_SYMBOL_GPL(rt2x00mac_config);
 334 
 335 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
 336                                 unsigned int changed_flags,
 337                                 unsigned int *total_flags,
 338                                 u64 multicast)
 339 {
 340         struct rt2x00_dev *rt2x00dev = hw->priv;
 341 
 342         /*
 343          * Mask off any flags we are going to ignore
 344          * from the total_flags field.
 345          */
 346         *total_flags &=
 347             FIF_ALLMULTI |
 348             FIF_FCSFAIL |
 349             FIF_PLCPFAIL |
 350             FIF_CONTROL |
 351             FIF_PSPOLL |
 352             FIF_OTHER_BSS;
 353 
 354         /*
 355          * Apply some rules to the filters:
 356          * - Some filters imply different filters to be set.
 357          * - Some things we can't filter out at all.
 358          * - Multicast filter seems to kill broadcast traffic so never use it.
 359          */
 360         *total_flags |= FIF_ALLMULTI;
 361 
 362         /*
 363          * If the device has a single filter for all control frames,
 364          * FIF_CONTROL and FIF_PSPOLL flags imply each other.
 365          * And if the device has more than one filter for control frames
 366          * of different types, but has no a separate filter for PS Poll frames,
 367          * FIF_CONTROL flag implies FIF_PSPOLL.
 368          */
 369         if (!rt2x00_has_cap_control_filters(rt2x00dev)) {
 370                 if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
 371                         *total_flags |= FIF_CONTROL | FIF_PSPOLL;
 372         }
 373         if (!rt2x00_has_cap_control_filter_pspoll(rt2x00dev)) {
 374                 if (*total_flags & FIF_CONTROL)
 375                         *total_flags |= FIF_PSPOLL;
 376         }
 377 
 378         rt2x00dev->packet_filter = *total_flags;
 379 
 380         rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
 381 }
 382 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
 383 
 384 static void rt2x00mac_set_tim_iter(void *data, u8 *mac,
 385                                    struct ieee80211_vif *vif)
 386 {
 387         struct rt2x00_intf *intf = vif_to_intf(vif);
 388 
 389         if (vif->type != NL80211_IFTYPE_AP &&
 390             vif->type != NL80211_IFTYPE_ADHOC &&
 391             vif->type != NL80211_IFTYPE_MESH_POINT &&
 392             vif->type != NL80211_IFTYPE_WDS)
 393                 return;
 394 
 395         set_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags);
 396 }
 397 
 398 int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
 399                       bool set)
 400 {
 401         struct rt2x00_dev *rt2x00dev = hw->priv;
 402 
 403         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 404                 return 0;
 405 
 406         ieee80211_iterate_active_interfaces_atomic(
 407                 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 408                 rt2x00mac_set_tim_iter, rt2x00dev);
 409 
 410         /* queue work to upodate the beacon template */
 411         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
 412         return 0;
 413 }
 414 EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);
 415 
 416 #ifdef CONFIG_RT2X00_LIB_CRYPTO
 417 static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
 418 {
 419         if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
 420                 memcpy(crypto->key,
 421                        &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
 422                        sizeof(crypto->key));
 423 
 424         if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
 425                 memcpy(crypto->tx_mic,
 426                        &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
 427                        sizeof(crypto->tx_mic));
 428 
 429         if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
 430                 memcpy(crypto->rx_mic,
 431                        &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
 432                        sizeof(crypto->rx_mic));
 433 }
 434 
 435 int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 436                       struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 437                       struct ieee80211_key_conf *key)
 438 {
 439         struct rt2x00_dev *rt2x00dev = hw->priv;
 440         int (*set_key) (struct rt2x00_dev *rt2x00dev,
 441                         struct rt2x00lib_crypto *crypto,
 442                         struct ieee80211_key_conf *key);
 443         struct rt2x00lib_crypto crypto;
 444         static const u8 bcast_addr[ETH_ALEN] =
 445                 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
 446         struct rt2x00_sta *sta_priv = NULL;
 447 
 448         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 449                 return 0;
 450 
 451         if (!rt2x00_has_cap_hw_crypto(rt2x00dev))
 452                 return -EOPNOTSUPP;
 453 
 454         /*
 455          * To support IBSS RSN, don't program group keys in IBSS, the
 456          * hardware will then not attempt to decrypt the frames.
 457          */
 458         if (vif->type == NL80211_IFTYPE_ADHOC &&
 459             !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE))
 460                 return -EOPNOTSUPP;
 461 
 462         if (key->keylen > 32)
 463                 return -ENOSPC;
 464 
 465         memset(&crypto, 0, sizeof(crypto));
 466 
 467         crypto.bssidx = rt2x00lib_get_bssidx(rt2x00dev, vif);
 468         crypto.cipher = rt2x00crypto_key_to_cipher(key);
 469         if (crypto.cipher == CIPHER_NONE)
 470                 return -EOPNOTSUPP;
 471         if (crypto.cipher == CIPHER_TKIP && rt2x00_is_usb(rt2x00dev))
 472                 return -EOPNOTSUPP;
 473 
 474         crypto.cmd = cmd;
 475 
 476         if (sta) {
 477                 crypto.address = sta->addr;
 478                 sta_priv = sta_to_rt2x00_sta(sta);
 479                 crypto.wcid = sta_priv->wcid;
 480         } else
 481                 crypto.address = bcast_addr;
 482 
 483         if (crypto.cipher == CIPHER_TKIP)
 484                 memcpy_tkip(&crypto, &key->key[0], key->keylen);
 485         else
 486                 memcpy(crypto.key, &key->key[0], key->keylen);
 487         /*
 488          * Each BSS has a maximum of 4 shared keys.
 489          * Shared key index values:
 490          *      0) BSS0 key0
 491          *      1) BSS0 key1
 492          *      ...
 493          *      4) BSS1 key0
 494          *      ...
 495          *      8) BSS2 key0
 496          *      ...
 497          * Both pairwise as shared key indeces are determined by
 498          * driver. This is required because the hardware requires
 499          * keys to be assigned in correct order (When key 1 is
 500          * provided but key 0 is not, then the key is not found
 501          * by the hardware during RX).
 502          */
 503         if (cmd == SET_KEY)
 504                 key->hw_key_idx = 0;
 505 
 506         if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
 507                 set_key = rt2x00dev->ops->lib->config_pairwise_key;
 508         else
 509                 set_key = rt2x00dev->ops->lib->config_shared_key;
 510 
 511         if (!set_key)
 512                 return -EOPNOTSUPP;
 513 
 514         return set_key(rt2x00dev, &crypto, key);
 515 }
 516 EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
 517 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
 518 
 519 void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw,
 520                              struct ieee80211_vif *vif,
 521                              const u8 *mac_addr)
 522 {
 523         struct rt2x00_dev *rt2x00dev = hw->priv;
 524         set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
 525         rt2x00link_stop_tuner(rt2x00dev);
 526 }
 527 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);
 528 
 529 void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw,
 530                                 struct ieee80211_vif *vif)
 531 {
 532         struct rt2x00_dev *rt2x00dev = hw->priv;
 533         clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
 534         rt2x00link_start_tuner(rt2x00dev);
 535 }
 536 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);
 537 
 538 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
 539                         struct ieee80211_low_level_stats *stats)
 540 {
 541         struct rt2x00_dev *rt2x00dev = hw->priv;
 542 
 543         /*
 544          * The dot11ACKFailureCount, dot11RTSFailureCount and
 545          * dot11RTSSuccessCount are updated in interrupt time.
 546          * dot11FCSErrorCount is updated in the link tuner.
 547          */
 548         memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
 549 
 550         return 0;
 551 }
 552 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
 553 
 554 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
 555                                 struct ieee80211_vif *vif,
 556                                 struct ieee80211_bss_conf *bss_conf,
 557                                 u32 changes)
 558 {
 559         struct rt2x00_dev *rt2x00dev = hw->priv;
 560         struct rt2x00_intf *intf = vif_to_intf(vif);
 561 
 562         /*
 563          * mac80211 might be calling this function while we are trying
 564          * to remove the device or perhaps suspending it.
 565          */
 566         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 567                 return;
 568 
 569         /*
 570          * Update the BSSID.
 571          */
 572         if (changes & BSS_CHANGED_BSSID)
 573                 rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
 574                                       bss_conf->bssid);
 575 
 576         /*
 577          * Start/stop beaconing.
 578          */
 579         if (changes & BSS_CHANGED_BEACON_ENABLED) {
 580                 mutex_lock(&intf->beacon_skb_mutex);
 581                 if (!bss_conf->enable_beacon && intf->enable_beacon) {
 582                         rt2x00dev->intf_beaconing--;
 583                         intf->enable_beacon = false;
 584 
 585                         if (rt2x00dev->intf_beaconing == 0) {
 586                                 /*
 587                                  * Last beaconing interface disabled
 588                                  * -> stop beacon queue.
 589                                  */
 590                                 rt2x00queue_stop_queue(rt2x00dev->bcn);
 591                         }
 592                         /*
 593                          * Clear beacon in the H/W for this vif. This is needed
 594                          * to disable beaconing on this particular interface
 595                          * and keep it running on other interfaces.
 596                          */
 597                         rt2x00queue_clear_beacon(rt2x00dev, vif);
 598                 } else if (bss_conf->enable_beacon && !intf->enable_beacon) {
 599                         rt2x00dev->intf_beaconing++;
 600                         intf->enable_beacon = true;
 601                         /*
 602                          * Upload beacon to the H/W. This is only required on
 603                          * USB devices. PCI devices fetch beacons periodically.
 604                          */
 605                         if (rt2x00_is_usb(rt2x00dev))
 606                                 rt2x00queue_update_beacon(rt2x00dev, vif);
 607 
 608                         if (rt2x00dev->intf_beaconing == 1) {
 609                                 /*
 610                                  * First beaconing interface enabled
 611                                  * -> start beacon queue.
 612                                  */
 613                                 rt2x00queue_start_queue(rt2x00dev->bcn);
 614                         }
 615                 }
 616                 mutex_unlock(&intf->beacon_skb_mutex);
 617         }
 618 
 619         /*
 620          * When the association status has changed we must reset the link
 621          * tuner counter. This is because some drivers determine if they
 622          * should perform link tuning based on the number of seconds
 623          * while associated or not associated.
 624          */
 625         if (changes & BSS_CHANGED_ASSOC) {
 626                 rt2x00dev->link.count = 0;
 627 
 628                 if (bss_conf->assoc)
 629                         rt2x00dev->intf_associated++;
 630                 else
 631                         rt2x00dev->intf_associated--;
 632 
 633                 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 634         }
 635 
 636         /*
 637          * When the erp information has changed, we should perform
 638          * additional configuration steps. For all other changes we are done.
 639          */
 640         if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
 641                        BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
 642                        BSS_CHANGED_BEACON_INT | BSS_CHANGED_HT))
 643                 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
 644 }
 645 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
 646 
 647 int rt2x00mac_conf_tx(struct ieee80211_hw *hw,
 648                       struct ieee80211_vif *vif, u16 queue_idx,
 649                       const struct ieee80211_tx_queue_params *params)
 650 {
 651         struct rt2x00_dev *rt2x00dev = hw->priv;
 652         struct data_queue *queue;
 653 
 654         queue = rt2x00queue_get_tx_queue(rt2x00dev, queue_idx);
 655         if (unlikely(!queue))
 656                 return -EINVAL;
 657 
 658         /*
 659          * The passed variables are stored as real value ((2^n)-1).
 660          * Ralink registers require to know the bit number 'n'.
 661          */
 662         if (params->cw_min > 0)
 663                 queue->cw_min = fls(params->cw_min);
 664         else
 665                 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
 666 
 667         if (params->cw_max > 0)
 668                 queue->cw_max = fls(params->cw_max);
 669         else
 670                 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
 671 
 672         queue->aifs = params->aifs;
 673         queue->txop = params->txop;
 674 
 675         rt2x00_dbg(rt2x00dev,
 676                    "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d\n",
 677                    queue_idx, queue->cw_min, queue->cw_max, queue->aifs,
 678                    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);
 692 
 693 void rt2x00mac_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 694                      u32 queues, bool drop)
 695 {
 696         struct rt2x00_dev *rt2x00dev = hw->priv;
 697         struct data_queue *queue;
 698 
 699         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 700                 return;
 701 
 702         set_bit(DEVICE_STATE_FLUSHING, &rt2x00dev->flags);
 703 
 704         tx_queue_for_each(rt2x00dev, queue)
 705                 rt2x00queue_flush_queue(queue, drop);
 706 
 707         clear_bit(DEVICE_STATE_FLUSHING, &rt2x00dev->flags);
 708 }
 709 EXPORT_SYMBOL_GPL(rt2x00mac_flush);
 710 
 711 int rt2x00mac_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
 712 {
 713         struct rt2x00_dev *rt2x00dev = hw->priv;
 714         struct link_ant *ant = &rt2x00dev->link.ant;
 715         struct antenna_setup *def = &rt2x00dev->default_ant;
 716         struct antenna_setup setup;
 717 
 718         // The antenna value is not supposed to be 0,
 719         // or exceed the maximum number of antenna's.
 720         if (!tx_ant || (tx_ant & ~3) || !rx_ant || (rx_ant & ~3))
 721                 return -EINVAL;
 722 
 723         // When the client tried to configure the antenna to or from
 724         // diversity mode, we must reset the default antenna as well
 725         // as that controls the diversity switch.
 726         if (ant->flags & ANTENNA_TX_DIVERSITY && tx_ant != 3)
 727                 ant->flags &= ~ANTENNA_TX_DIVERSITY;
 728         if (ant->flags & ANTENNA_RX_DIVERSITY && rx_ant != 3)
 729                 ant->flags &= ~ANTENNA_RX_DIVERSITY;
 730 
 731         // If diversity is being enabled, check if we need hardware
 732         // or software diversity. In the latter case, reset the value,
 733         // and make sure we update the antenna flags to have the
 734         // link tuner pick up the diversity tuning.
 735         if (tx_ant == 3 && def->tx == ANTENNA_SW_DIVERSITY) {
 736                 tx_ant = ANTENNA_SW_DIVERSITY;
 737                 ant->flags |= ANTENNA_TX_DIVERSITY;
 738         }
 739 
 740         if (rx_ant == 3 && def->rx == ANTENNA_SW_DIVERSITY) {
 741                 rx_ant = ANTENNA_SW_DIVERSITY;
 742                 ant->flags |= ANTENNA_RX_DIVERSITY;
 743         }
 744 
 745         setup.tx = tx_ant;
 746         setup.rx = rx_ant;
 747         setup.rx_chain_num = 0;
 748         setup.tx_chain_num = 0;
 749 
 750         rt2x00lib_config_antenna(rt2x00dev, setup);
 751 
 752         return 0;
 753 }
 754 EXPORT_SYMBOL_GPL(rt2x00mac_set_antenna);
 755 
 756 int rt2x00mac_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
 757 {
 758         struct rt2x00_dev *rt2x00dev = hw->priv;
 759         struct link_ant *ant = &rt2x00dev->link.ant;
 760         struct antenna_setup *active = &rt2x00dev->link.ant.active;
 761 
 762         // When software diversity is active, we must report this to the
 763         // client and not the current active antenna state.
 764         if (ant->flags & ANTENNA_TX_DIVERSITY)
 765                 *tx_ant = ANTENNA_HW_DIVERSITY;
 766         else
 767                 *tx_ant = active->tx;
 768 
 769         if (ant->flags & ANTENNA_RX_DIVERSITY)
 770                 *rx_ant = ANTENNA_HW_DIVERSITY;
 771         else
 772                 *rx_ant = active->rx;
 773 
 774         return 0;
 775 }
 776 EXPORT_SYMBOL_GPL(rt2x00mac_get_antenna);
 777 
 778 void rt2x00mac_get_ringparam(struct ieee80211_hw *hw,
 779                              u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max)
 780 {
 781         struct rt2x00_dev *rt2x00dev = hw->priv;
 782         struct data_queue *queue;
 783 
 784         tx_queue_for_each(rt2x00dev, queue) {
 785                 *tx += queue->length;
 786                 *tx_max += queue->limit;
 787         }
 788 
 789         *rx = rt2x00dev->rx->length;
 790         *rx_max = rt2x00dev->rx->limit;
 791 }
 792 EXPORT_SYMBOL_GPL(rt2x00mac_get_ringparam);
 793 
 794 bool rt2x00mac_tx_frames_pending(struct ieee80211_hw *hw)
 795 {
 796         struct rt2x00_dev *rt2x00dev = hw->priv;
 797         struct data_queue *queue;
 798 
 799         tx_queue_for_each(rt2x00dev, queue) {
 800                 if (!rt2x00queue_empty(queue))
 801                         return true;
 802         }
 803 
 804         return false;
 805 }
 806 EXPORT_SYMBOL_GPL(rt2x00mac_tx_frames_pending);