linux/drivers/net/wireless/rt2x00/rt2x00mac.c
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   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
  32static 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                rt2x00_warn(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, NULL, true);
  94        if (retval) {
  95                dev_kfree_skb_any(skb);
  96                rt2x00_warn(rt2x00dev, "Failed to send RTS/CTS frame\n");
  97        }
  98
  99        return retval;
 100}
 101
 102void rt2x00mac_tx(struct ieee80211_hw *hw,
 103                  struct ieee80211_tx_control *control,
 104                  struct sk_buff *skb)
 105{
 106        struct rt2x00_dev *rt2x00dev = hw->priv;
 107        struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 108        enum data_queue_qid qid = skb_get_queue_mapping(skb);
 109        struct data_queue *queue = NULL;
 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_free_skb;
 119
 120        /*
 121         * Use the ATIM queue if appropriate and present.
 122         */
 123        if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
 124            test_bit(REQUIRE_ATIM_QUEUE, &rt2x00dev->cap_flags))
 125                qid = QID_ATIM;
 126
 127        queue = rt2x00queue_get_tx_queue(rt2x00dev, qid);
 128        if (unlikely(!queue)) {
 129                rt2x00_err(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_free_skb;
 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        if (!rt2x00dev->ops->hw->set_rts_threshold &&
 145            (tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS |
 146                                                IEEE80211_TX_RC_USE_CTS_PROTECT))) {
 147                if (rt2x00queue_available(queue) <= 1)
 148                        goto exit_fail;
 149
 150                if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
 151                        goto exit_fail;
 152        }
 153
 154        if (unlikely(rt2x00queue_write_tx_frame(queue, skb, control->sta, false)))
 155                goto exit_fail;
 156
 157        /*
 158         * Pausing queue has to be serialized with rt2x00lib_txdone(). Note
 159         * we should not use spin_lock_bh variant as bottom halve was already
 160         * disabled before ieee80211_xmit() call.
 161         */
 162        spin_lock(&queue->tx_lock);
 163        if (rt2x00queue_threshold(queue))
 164                rt2x00queue_pause_queue(queue);
 165        spin_unlock(&queue->tx_lock);
 166
 167        return;
 168
 169 exit_fail:
 170        spin_lock(&queue->tx_lock);
 171        rt2x00queue_pause_queue(queue);
 172        spin_unlock(&queue->tx_lock);
 173 exit_free_skb:
 174        ieee80211_free_txskb(hw, skb);
 175}
 176EXPORT_SYMBOL_GPL(rt2x00mac_tx);
 177
 178int rt2x00mac_start(struct ieee80211_hw *hw)
 179{
 180        struct rt2x00_dev *rt2x00dev = hw->priv;
 181
 182        if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 183                return 0;
 184
 185        return rt2x00lib_start(rt2x00dev);
 186}
 187EXPORT_SYMBOL_GPL(rt2x00mac_start);
 188
 189void rt2x00mac_stop(struct ieee80211_hw *hw)
 190{
 191        struct rt2x00_dev *rt2x00dev = hw->priv;
 192
 193        if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 194                return;
 195
 196        rt2x00lib_stop(rt2x00dev);
 197}
 198EXPORT_SYMBOL_GPL(rt2x00mac_stop);
 199
 200int rt2x00mac_add_interface(struct ieee80211_hw *hw,
 201                            struct ieee80211_vif *vif)
 202{
 203        struct rt2x00_dev *rt2x00dev = hw->priv;
 204        struct rt2x00_intf *intf = vif_to_intf(vif);
 205        struct data_queue *queue = rt2x00dev->bcn;
 206        struct queue_entry *entry = NULL;
 207        unsigned int i;
 208
 209        /*
 210         * Don't allow interfaces to be added
 211         * the device has disappeared.
 212         */
 213        if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 214            !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 215                return -ENODEV;
 216
 217        /*
 218         * Loop through all beacon queues to find a free
 219         * entry. Since there are as much beacon entries
 220         * as the maximum interfaces, this search shouldn't
 221         * fail.
 222         */
 223        for (i = 0; i < queue->limit; i++) {
 224                entry = &queue->entries[i];
 225                if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
 226                        break;
 227        }
 228
 229        if (unlikely(i == queue->limit))
 230                return -ENOBUFS;
 231
 232        /*
 233         * We are now absolutely sure the interface can be created,
 234         * increase interface count and start initialization.
 235         */
 236
 237        if (vif->type == NL80211_IFTYPE_AP)
 238                rt2x00dev->intf_ap_count++;
 239        else
 240                rt2x00dev->intf_sta_count++;
 241
 242        mutex_init(&intf->beacon_skb_mutex);
 243        intf->beacon = entry;
 244
 245        /*
 246         * The MAC address must be configured after the device
 247         * has been initialized. Otherwise the device can reset
 248         * the MAC registers.
 249         * The BSSID address must only be configured in AP mode,
 250         * however we should not send an empty BSSID address for
 251         * STA interfaces at this time, since this can cause
 252         * invalid behavior in the device.
 253         */
 254        rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
 255                              vif->addr, NULL);
 256
 257        /*
 258         * Some filters depend on the current working mode. We can force
 259         * an update during the next configure_filter() run by mac80211 by
 260         * resetting the current packet_filter state.
 261         */
 262        rt2x00dev->packet_filter = 0;
 263
 264        return 0;
 265}
 266EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
 267
 268void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
 269                                struct ieee80211_vif *vif)
 270{
 271        struct rt2x00_dev *rt2x00dev = hw->priv;
 272        struct rt2x00_intf *intf = vif_to_intf(vif);
 273
 274        /*
 275         * Don't allow interfaces to be remove while
 276         * either the device has disappeared or when
 277         * no interface is present.
 278         */
 279        if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 280            (vif->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
 281            (vif->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
 282                return;
 283
 284        if (vif->type == NL80211_IFTYPE_AP)
 285                rt2x00dev->intf_ap_count--;
 286        else
 287                rt2x00dev->intf_sta_count--;
 288
 289        /*
 290         * Release beacon entry so it is available for
 291         * new interfaces again.
 292         */
 293        clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
 294
 295        /*
 296         * Make sure the bssid and mac address registers
 297         * are cleared to prevent false ACKing of frames.
 298         */
 299        rt2x00lib_config_intf(rt2x00dev, intf,
 300                              NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
 301}
 302EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
 303
 304int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
 305{
 306        struct rt2x00_dev *rt2x00dev = hw->priv;
 307        struct ieee80211_conf *conf = &hw->conf;
 308
 309        /*
 310         * mac80211 might be calling this function while we are trying
 311         * to remove the device or perhaps suspending it.
 312         */
 313        if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 314                return 0;
 315
 316        /*
 317         * Some configuration parameters (e.g. channel and antenna values) can
 318         * only be set when the radio is enabled, but do require the RX to
 319         * be off. During this period we should keep link tuning enabled,
 320         * if for any reason the link tuner must be reset, this will be
 321         * handled by rt2x00lib_config().
 322         */
 323        rt2x00queue_stop_queue(rt2x00dev->rx);
 324
 325        /*
 326         * When we've just turned on the radio, we want to reprogram
 327         * everything to ensure a consistent state
 328         */
 329        rt2x00lib_config(rt2x00dev, conf, changed);
 330
 331        /*
 332         * After the radio has been enabled we need to configure
 333         * the antenna to the default settings. rt2x00lib_config_antenna()
 334         * should determine if any action should be taken based on
 335         * checking if diversity has been enabled or no antenna changes
 336         * have been made since the last configuration change.
 337         */
 338        rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);
 339
 340        /* Turn RX back on */
 341        rt2x00queue_start_queue(rt2x00dev->rx);
 342
 343        return 0;
 344}
 345EXPORT_SYMBOL_GPL(rt2x00mac_config);
 346
 347void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
 348                                unsigned int changed_flags,
 349                                unsigned int *total_flags,
 350                                u64 multicast)
 351{
 352        struct rt2x00_dev *rt2x00dev = hw->priv;
 353
 354        /*
 355         * Mask off any flags we are going to ignore
 356         * from the total_flags field.
 357         */
 358        *total_flags &=
 359            FIF_ALLMULTI |
 360            FIF_FCSFAIL |
 361            FIF_PLCPFAIL |
 362            FIF_CONTROL |
 363            FIF_PSPOLL |
 364            FIF_OTHER_BSS |
 365            FIF_PROMISC_IN_BSS;
 366
 367        /*
 368         * Apply some rules to the filters:
 369         * - Some filters imply different filters to be set.
 370         * - Some things we can't filter out at all.
 371         * - Multicast filter seems to kill broadcast traffic so never use it.
 372         */
 373        *total_flags |= FIF_ALLMULTI;
 374        if (*total_flags & FIF_OTHER_BSS ||
 375            *total_flags & FIF_PROMISC_IN_BSS)
 376                *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
 377
 378        /*
 379         * If the device has a single filter for all control frames,
 380         * FIF_CONTROL and FIF_PSPOLL flags imply each other.
 381         * And if the device has more than one filter for control frames
 382         * of different types, but has no a separate filter for PS Poll frames,
 383         * FIF_CONTROL flag implies FIF_PSPOLL.
 384         */
 385        if (!rt2x00_has_cap_control_filters(rt2x00dev)) {
 386                if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
 387                        *total_flags |= FIF_CONTROL | FIF_PSPOLL;
 388        }
 389        if (!rt2x00_has_cap_control_filter_pspoll(rt2x00dev)) {
 390                if (*total_flags & FIF_CONTROL)
 391                        *total_flags |= FIF_PSPOLL;
 392        }
 393
 394        /*
 395         * Check if there is any work left for us.
 396         */
 397        if (rt2x00dev->packet_filter == *total_flags)
 398                return;
 399        rt2x00dev->packet_filter = *total_flags;
 400
 401        rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
 402}
 403EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
 404
 405static void rt2x00mac_set_tim_iter(void *data, u8 *mac,
 406                                   struct ieee80211_vif *vif)
 407{
 408        struct rt2x00_intf *intf = vif_to_intf(vif);
 409
 410        if (vif->type != NL80211_IFTYPE_AP &&
 411            vif->type != NL80211_IFTYPE_ADHOC &&
 412            vif->type != NL80211_IFTYPE_MESH_POINT &&
 413            vif->type != NL80211_IFTYPE_WDS)
 414                return;
 415
 416        set_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags);
 417}
 418
 419int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
 420                      bool set)
 421{
 422        struct rt2x00_dev *rt2x00dev = hw->priv;
 423
 424        if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 425                return 0;
 426
 427        ieee80211_iterate_active_interfaces_atomic(
 428                rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 429                rt2x00mac_set_tim_iter, rt2x00dev);
 430
 431        /* queue work to upodate the beacon template */
 432        ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
 433        return 0;
 434}
 435EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);
 436
 437#ifdef CONFIG_RT2X00_LIB_CRYPTO
 438static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
 439{
 440        if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
 441                memcpy(crypto->key,
 442                       &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
 443                       sizeof(crypto->key));
 444
 445        if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
 446                memcpy(crypto->tx_mic,
 447                       &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
 448                       sizeof(crypto->tx_mic));
 449
 450        if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
 451                memcpy(crypto->rx_mic,
 452                       &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
 453                       sizeof(crypto->rx_mic));
 454}
 455
 456int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 457                      struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 458                      struct ieee80211_key_conf *key)
 459{
 460        struct rt2x00_dev *rt2x00dev = hw->priv;
 461        int (*set_key) (struct rt2x00_dev *rt2x00dev,
 462                        struct rt2x00lib_crypto *crypto,
 463                        struct ieee80211_key_conf *key);
 464        struct rt2x00lib_crypto crypto;
 465        static const u8 bcast_addr[ETH_ALEN] =
 466                { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
 467        struct rt2x00_sta *sta_priv = NULL;
 468
 469        if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 470                return 0;
 471
 472        if (!rt2x00_has_cap_hw_crypto(rt2x00dev))
 473                return -EOPNOTSUPP;
 474
 475        /*
 476         * To support IBSS RSN, don't program group keys in IBSS, the
 477         * hardware will then not attempt to decrypt the frames.
 478         */
 479        if (vif->type == NL80211_IFTYPE_ADHOC &&
 480            !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE))
 481                return -EOPNOTSUPP;
 482
 483        if (key->keylen > 32)
 484                return -ENOSPC;
 485
 486        memset(&crypto, 0, sizeof(crypto));
 487
 488        crypto.bssidx = rt2x00lib_get_bssidx(rt2x00dev, vif);
 489        crypto.cipher = rt2x00crypto_key_to_cipher(key);
 490        if (crypto.cipher == CIPHER_NONE)
 491                return -EOPNOTSUPP;
 492
 493        crypto.cmd = cmd;
 494
 495        if (sta) {
 496                crypto.address = sta->addr;
 497                sta_priv = sta_to_rt2x00_sta(sta);
 498                crypto.wcid = sta_priv->wcid;
 499        } else
 500                crypto.address = bcast_addr;
 501
 502        if (crypto.cipher == CIPHER_TKIP)
 503                memcpy_tkip(&crypto, &key->key[0], key->keylen);
 504        else
 505                memcpy(crypto.key, &key->key[0], key->keylen);
 506        /*
 507         * Each BSS has a maximum of 4 shared keys.
 508         * Shared key index values:
 509         *      0) BSS0 key0
 510         *      1) BSS0 key1
 511         *      ...
 512         *      4) BSS1 key0
 513         *      ...
 514         *      8) BSS2 key0
 515         *      ...
 516         * Both pairwise as shared key indeces are determined by
 517         * driver. This is required because the hardware requires
 518         * keys to be assigned in correct order (When key 1 is
 519         * provided but key 0 is not, then the key is not found
 520         * by the hardware during RX).
 521         */
 522        if (cmd == SET_KEY)
 523                key->hw_key_idx = 0;
 524
 525        if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
 526                set_key = rt2x00dev->ops->lib->config_pairwise_key;
 527        else
 528                set_key = rt2x00dev->ops->lib->config_shared_key;
 529
 530        if (!set_key)
 531                return -EOPNOTSUPP;
 532
 533        return set_key(rt2x00dev, &crypto, key);
 534}
 535EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
 536#endif /* CONFIG_RT2X00_LIB_CRYPTO */
 537
 538int rt2x00mac_sta_add(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 539                      struct ieee80211_sta *sta)
 540{
 541        struct rt2x00_dev *rt2x00dev = hw->priv;
 542        struct rt2x00_sta *sta_priv = sta_to_rt2x00_sta(sta);
 543
 544        /*
 545         * If there's no space left in the device table store
 546         * -1 as wcid but tell mac80211 everything went ok.
 547         */
 548        if (rt2x00dev->ops->lib->sta_add(rt2x00dev, vif, sta))
 549                sta_priv->wcid = -1;
 550
 551        return 0;
 552}
 553EXPORT_SYMBOL_GPL(rt2x00mac_sta_add);
 554
 555int rt2x00mac_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 556                         struct ieee80211_sta *sta)
 557{
 558        struct rt2x00_dev *rt2x00dev = hw->priv;
 559        struct rt2x00_sta *sta_priv = sta_to_rt2x00_sta(sta);
 560
 561        /*
 562         * If we never sent the STA to the device no need to clean it up.
 563         */
 564        if (sta_priv->wcid < 0)
 565                return 0;
 566
 567        return rt2x00dev->ops->lib->sta_remove(rt2x00dev, sta_priv->wcid);
 568}
 569EXPORT_SYMBOL_GPL(rt2x00mac_sta_remove);
 570
 571void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw)
 572{
 573        struct rt2x00_dev *rt2x00dev = hw->priv;
 574        set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
 575        rt2x00link_stop_tuner(rt2x00dev);
 576}
 577EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);
 578
 579void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw)
 580{
 581        struct rt2x00_dev *rt2x00dev = hw->priv;
 582        clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
 583        rt2x00link_start_tuner(rt2x00dev);
 584}
 585EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);
 586
 587int rt2x00mac_get_stats(struct ieee80211_hw *hw,
 588                        struct ieee80211_low_level_stats *stats)
 589{
 590        struct rt2x00_dev *rt2x00dev = hw->priv;
 591
 592        /*
 593         * The dot11ACKFailureCount, dot11RTSFailureCount and
 594         * dot11RTSSuccessCount are updated in interrupt time.
 595         * dot11FCSErrorCount is updated in the link tuner.
 596         */
 597        memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
 598
 599        return 0;
 600}
 601EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
 602
 603void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
 604                                struct ieee80211_vif *vif,
 605                                struct ieee80211_bss_conf *bss_conf,
 606                                u32 changes)
 607{
 608        struct rt2x00_dev *rt2x00dev = hw->priv;
 609        struct rt2x00_intf *intf = vif_to_intf(vif);
 610
 611        /*
 612         * mac80211 might be calling this function while we are trying
 613         * to remove the device or perhaps suspending it.
 614         */
 615        if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 616                return;
 617
 618        /*
 619         * Update the BSSID.
 620         */
 621        if (changes & BSS_CHANGED_BSSID)
 622                rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
 623                                      bss_conf->bssid);
 624
 625        /*
 626         * Update the beacon. This is only required on USB devices. PCI
 627         * devices fetch beacons periodically.
 628         */
 629        if (changes & BSS_CHANGED_BEACON && rt2x00_is_usb(rt2x00dev))
 630                rt2x00queue_update_beacon(rt2x00dev, vif);
 631
 632        /*
 633         * Start/stop beaconing.
 634         */
 635        if (changes & BSS_CHANGED_BEACON_ENABLED) {
 636                if (!bss_conf->enable_beacon && intf->enable_beacon) {
 637                        rt2x00queue_clear_beacon(rt2x00dev, vif);
 638                        rt2x00dev->intf_beaconing--;
 639                        intf->enable_beacon = false;
 640
 641                        if (rt2x00dev->intf_beaconing == 0) {
 642                                /*
 643                                 * Last beaconing interface disabled
 644                                 * -> stop beacon queue.
 645                                 */
 646                                mutex_lock(&intf->beacon_skb_mutex);
 647                                rt2x00queue_stop_queue(rt2x00dev->bcn);
 648                                mutex_unlock(&intf->beacon_skb_mutex);
 649                        }
 650
 651
 652                } else if (bss_conf->enable_beacon && !intf->enable_beacon) {
 653                        rt2x00dev->intf_beaconing++;
 654                        intf->enable_beacon = true;
 655
 656                        if (rt2x00dev->intf_beaconing == 1) {
 657                                /*
 658                                 * First beaconing interface enabled
 659                                 * -> start beacon queue.
 660                                 */
 661                                mutex_lock(&intf->beacon_skb_mutex);
 662                                rt2x00queue_start_queue(rt2x00dev->bcn);
 663                                mutex_unlock(&intf->beacon_skb_mutex);
 664                        }
 665                }
 666        }
 667
 668        /*
 669         * When the association status has changed we must reset the link
 670         * tuner counter. This is because some drivers determine if they
 671         * should perform link tuning based on the number of seconds
 672         * while associated or not associated.
 673         */
 674        if (changes & BSS_CHANGED_ASSOC) {
 675                rt2x00dev->link.count = 0;
 676
 677                if (bss_conf->assoc)
 678                        rt2x00dev->intf_associated++;
 679                else
 680                        rt2x00dev->intf_associated--;
 681
 682                rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 683
 684                clear_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags);
 685        }
 686
 687        /*
 688         * Check for access point which do not support 802.11e . We have to
 689         * generate data frames sequence number in S/W for such AP, because
 690         * of H/W bug.
 691         */
 692        if (changes & BSS_CHANGED_QOS && !bss_conf->qos)
 693                set_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags);
 694
 695        /*
 696         * When the erp information has changed, we should perform
 697         * additional configuration steps. For all other changes we are done.
 698         */
 699        if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
 700                       BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
 701                       BSS_CHANGED_BEACON_INT | BSS_CHANGED_HT))
 702                rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
 703}
 704EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
 705
 706int rt2x00mac_conf_tx(struct ieee80211_hw *hw,
 707                      struct ieee80211_vif *vif, u16 queue_idx,
 708                      const struct ieee80211_tx_queue_params *params)
 709{
 710        struct rt2x00_dev *rt2x00dev = hw->priv;
 711        struct data_queue *queue;
 712
 713        queue = rt2x00queue_get_tx_queue(rt2x00dev, queue_idx);
 714        if (unlikely(!queue))
 715                return -EINVAL;
 716
 717        /*
 718         * The passed variables are stored as real value ((2^n)-1).
 719         * Ralink registers require to know the bit number 'n'.
 720         */
 721        if (params->cw_min > 0)
 722                queue->cw_min = fls(params->cw_min);
 723        else
 724                queue->cw_min = 5; /* cw_min: 2^5 = 32. */
 725
 726        if (params->cw_max > 0)
 727                queue->cw_max = fls(params->cw_max);
 728        else
 729                queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
 730
 731        queue->aifs = params->aifs;
 732        queue->txop = params->txop;
 733
 734        rt2x00_dbg(rt2x00dev,
 735                   "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d\n",
 736                   queue_idx, queue->cw_min, queue->cw_max, queue->aifs,
 737                   queue->txop);
 738
 739        return 0;
 740}
 741EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
 742
 743void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
 744{
 745        struct rt2x00_dev *rt2x00dev = hw->priv;
 746        bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
 747
 748        wiphy_rfkill_set_hw_state(hw->wiphy, !active);
 749}
 750EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);
 751
 752void rt2x00mac_flush(struct ieee80211_hw *hw, u32 queues, bool drop)
 753{
 754        struct rt2x00_dev *rt2x00dev = hw->priv;
 755        struct data_queue *queue;
 756
 757        if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 758                return;
 759
 760        tx_queue_for_each(rt2x00dev, queue)
 761                rt2x00queue_flush_queue(queue, drop);
 762}
 763EXPORT_SYMBOL_GPL(rt2x00mac_flush);
 764
 765int rt2x00mac_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
 766{
 767        struct rt2x00_dev *rt2x00dev = hw->priv;
 768        struct link_ant *ant = &rt2x00dev->link.ant;
 769        struct antenna_setup *def = &rt2x00dev->default_ant;
 770        struct antenna_setup setup;
 771
 772        // The antenna value is not supposed to be 0,
 773        // or exceed the maximum number of antenna's.
 774        if (!tx_ant || (tx_ant & ~3) || !rx_ant || (rx_ant & ~3))
 775                return -EINVAL;
 776
 777        // When the client tried to configure the antenna to or from
 778        // diversity mode, we must reset the default antenna as well
 779        // as that controls the diversity switch.
 780        if (ant->flags & ANTENNA_TX_DIVERSITY && tx_ant != 3)
 781                ant->flags &= ~ANTENNA_TX_DIVERSITY;
 782        if (ant->flags & ANTENNA_RX_DIVERSITY && rx_ant != 3)
 783                ant->flags &= ~ANTENNA_RX_DIVERSITY;
 784
 785        // If diversity is being enabled, check if we need hardware
 786        // or software diversity. In the latter case, reset the value,
 787        // and make sure we update the antenna flags to have the
 788        // link tuner pick up the diversity tuning.
 789        if (tx_ant == 3 && def->tx == ANTENNA_SW_DIVERSITY) {
 790                tx_ant = ANTENNA_SW_DIVERSITY;
 791                ant->flags |= ANTENNA_TX_DIVERSITY;
 792        }
 793
 794        if (rx_ant == 3 && def->rx == ANTENNA_SW_DIVERSITY) {
 795                rx_ant = ANTENNA_SW_DIVERSITY;
 796                ant->flags |= ANTENNA_RX_DIVERSITY;
 797        }
 798
 799        setup.tx = tx_ant;
 800        setup.rx = rx_ant;
 801
 802        rt2x00lib_config_antenna(rt2x00dev, setup);
 803
 804        return 0;
 805}
 806EXPORT_SYMBOL_GPL(rt2x00mac_set_antenna);
 807
 808int rt2x00mac_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
 809{
 810        struct rt2x00_dev *rt2x00dev = hw->priv;
 811        struct link_ant *ant = &rt2x00dev->link.ant;
 812        struct antenna_setup *active = &rt2x00dev->link.ant.active;
 813
 814        // When software diversity is active, we must report this to the
 815        // client and not the current active antenna state.
 816        if (ant->flags & ANTENNA_TX_DIVERSITY)
 817                *tx_ant = ANTENNA_HW_DIVERSITY;
 818        else
 819                *tx_ant = active->tx;
 820
 821        if (ant->flags & ANTENNA_RX_DIVERSITY)
 822                *rx_ant = ANTENNA_HW_DIVERSITY;
 823        else
 824                *rx_ant = active->rx;
 825
 826        return 0;
 827}
 828EXPORT_SYMBOL_GPL(rt2x00mac_get_antenna);
 829
 830void rt2x00mac_get_ringparam(struct ieee80211_hw *hw,
 831                             u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max)
 832{
 833        struct rt2x00_dev *rt2x00dev = hw->priv;
 834        struct data_queue *queue;
 835
 836        tx_queue_for_each(rt2x00dev, queue) {
 837                *tx += queue->length;
 838                *tx_max += queue->limit;
 839        }
 840
 841        *rx = rt2x00dev->rx->length;
 842        *rx_max = rt2x00dev->rx->limit;
 843}
 844EXPORT_SYMBOL_GPL(rt2x00mac_get_ringparam);
 845
 846bool rt2x00mac_tx_frames_pending(struct ieee80211_hw *hw)
 847{
 848        struct rt2x00_dev *rt2x00dev = hw->priv;
 849        struct data_queue *queue;
 850
 851        tx_queue_for_each(rt2x00dev, queue) {
 852                if (!rt2x00queue_empty(queue))
 853                        return true;
 854        }
 855
 856        return false;
 857}
 858EXPORT_SYMBOL_GPL(rt2x00mac_tx_frames_pending);
 859