drivers/net/wireless/ath/ath9k/common.c

   1 /*
   2  * Copyright (c) 2009 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 /*
  18  * Module for common driver code between ath9k and ath9k_htc
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23
  24 #include "common.h"
  25
  26 MODULE_AUTHOR("Atheros Communications");
  27 MODULE_DESCRIPTION("Shared library for Atheros wireless 802.11n LAN cards.");
  28 MODULE_LICENSE("Dual BSD/GPL");
  29
  30 /* Common RX processing */
  31
  32 /* Assumes you've already done the endian to CPU conversion */
  33 static bool ath9k_rx_accept(struct ath_common *common,
  34                             struct sk_buff *skb,
  35                             struct ieee80211_rx_status *rxs,
  36                             struct ath_rx_status *rx_stats,
  37                             bool *decrypt_error)
  38 {
  39         struct ath_hw *ah = common->ah;
  40         struct ieee80211_hdr *hdr;
  41         __le16 fc;
  42
  43         hdr = (struct ieee80211_hdr *) skb->data;
  44         fc = hdr->frame_control;
  45
  46         if (!rx_stats->rs_datalen)
  47                 return false;
  48         /*
  49          * rs_status follows rs_datalen so if rs_datalen is too large
  50          * we can take a hint that hardware corrupted it, so ignore
  51          * those frames.
  52          */
  53         if (rx_stats->rs_datalen > common->rx_bufsize)
  54                 return false;
  55
  56         /*
  57          * rs_more indicates chained descriptors which can be used
  58          * to link buffers together for a sort of scatter-gather
  59          * operation.
  60          *
  61          * The rx_stats->rs_status will not be set until the end of the
  62          * chained descriptors so it can be ignored if rs_more is set. The
  63          * rs_more will be false at the last element of the chained
  64          * descriptors.
  65          */
  66         if (!rx_stats->rs_more && rx_stats->rs_status != 0) {
  67                 if (rx_stats->rs_status & ATH9K_RXERR_CRC)
  68                         rxs->flag |= RX_FLAG_FAILED_FCS_CRC;
  69                 if (rx_stats->rs_status & ATH9K_RXERR_PHY)
  70                         return false;
  71
  72                 if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) {
  73                         *decrypt_error = true;
  74                 } else if (rx_stats->rs_status & ATH9K_RXERR_MIC) {
  75                         if (ieee80211_is_ctl(fc))
  76                                 /*
  77                                  * Sometimes, we get invalid
  78                                  * MIC failures on valid control frames.
  79                                  * Remove these mic errors.
  80                                  */
  81                                 rx_stats->rs_status &= ~ATH9K_RXERR_MIC;
  82                         else
  83                                 rxs->flag |= RX_FLAG_MMIC_ERROR;
  84                 }
  85                 /*
  86                  * Reject error frames with the exception of
  87                  * decryption and MIC failures. For monitor mode,
  88                  * we also ignore the CRC error.
  89                  */
  90                 if (ah->opmode == NL80211_IFTYPE_MONITOR) {
  91                         if (rx_stats->rs_status &
  92                             ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
  93                               ATH9K_RXERR_CRC))
  94                                 return false;
  95                 } else {
  96                         if (rx_stats->rs_status &
  97                             ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
  98                                 return false;
  99                         }
 100                 }
 101         }
 102         return true;
 103 }
 104
 105 static u8 ath9k_process_rate(struct ath_common *common,
 106                              struct ieee80211_hw *hw,
 107                              struct ath_rx_status *rx_stats,
 108                              struct ieee80211_rx_status *rxs,
 109                              struct sk_buff *skb)
 110 {
 111         struct ieee80211_supported_band *sband;
 112         enum ieee80211_band band;
 113         unsigned int i = 0;
 114
 115         band = hw->conf.channel->band;
 116         sband = hw->wiphy->bands[band];
 117
 118         if (rx_stats->rs_rate & 0x80) {
 119                 /* HT rate */
 120                 rxs->flag |= RX_FLAG_HT;
 121                 if (rx_stats->rs_flags & ATH9K_RX_2040)
 122                         rxs->flag |= RX_FLAG_40MHZ;
 123                 if (rx_stats->rs_flags & ATH9K_RX_GI)
 124                         rxs->flag |= RX_FLAG_SHORT_GI;
 125                 return rx_stats->rs_rate & 0x7f;
 126         }
 127
 128         for (i = 0; i < sband->n_bitrates; i++) {
 129                 if (sband->bitrates[i].hw_value == rx_stats->rs_rate)
 130                         return i;
 131                 if (sband->bitrates[i].hw_value_short == rx_stats->rs_rate) {
 132                         rxs->flag |= RX_FLAG_SHORTPRE;
 133                         return i;
 134                 }
 135         }
 136
 137         /* No valid hardware bitrate found -- we should not get here */
 138         ath_print(common, ATH_DBG_XMIT, "unsupported hw bitrate detected "
 139                   "0x%02x using 1 Mbit\n", rx_stats->rs_rate);
 140         if ((common->debug_mask & ATH_DBG_XMIT))
 141                 print_hex_dump_bytes("", DUMP_PREFIX_NONE, skb->data, skb->len);
 142
 143         return 0;
 144 }
 145
 146 static void ath9k_process_rssi(struct ath_common *common,
 147                                struct ieee80211_hw *hw,
 148                                struct sk_buff *skb,
 149                                struct ath_rx_status *rx_stats)
 150 {
 151         struct ath_hw *ah = common->ah;
 152         struct ieee80211_sta *sta;
 153         struct ieee80211_hdr *hdr;
 154         struct ath_node *an;
 155         int last_rssi = ATH_RSSI_DUMMY_MARKER;
 156         __le16 fc;
 157
 158         hdr = (struct ieee80211_hdr *)skb->data;
 159         fc = hdr->frame_control;
 160
 161         rcu_read_lock();
 162         /*
 163          * XXX: use ieee80211_find_sta! This requires quite a bit of work
 164          * under the current ath9k virtual wiphy implementation as we have
 165          * no way of tying a vif to wiphy. Typically vifs are attached to
 166          * at least one sdata of a wiphy on mac80211 but with ath9k virtual
 167          * wiphy you'd have to iterate over every wiphy and each sdata.
 168          */
 169         sta = ieee80211_find_sta_by_hw(hw, hdr->addr2);
 170         if (sta) {
 171                 an = (struct ath_node *) sta->drv_priv;
 172                 if (rx_stats->rs_rssi != ATH9K_RSSI_BAD &&
 173                    !rx_stats->rs_moreaggr)
 174                         ATH_RSSI_LPF(an->last_rssi, rx_stats->rs_rssi);
 175                 last_rssi = an->last_rssi;
 176         }
 177         rcu_read_unlock();
 178
 179         if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
 180                 rx_stats->rs_rssi = ATH_EP_RND(last_rssi,
 181                                               ATH_RSSI_EP_MULTIPLIER);
 182         if (rx_stats->rs_rssi < 0)
 183                 rx_stats->rs_rssi = 0;
 184
 185         /* Update Beacon RSSI, this is used by ANI. */
 186         if (ieee80211_is_beacon(fc))
 187                 ah->stats.avgbrssi = rx_stats->rs_rssi;
 188 }
 189
 190 /*
 191  * For Decrypt or Demic errors, we only mark packet status here and always push
 192  * up the frame up to let mac80211 handle the actual error case, be it no
 193  * decryption key or real decryption error. This let us keep statistics there.
 194  */
 195 int ath9k_cmn_rx_skb_preprocess(struct ath_common *common,
 196                                 struct ieee80211_hw *hw,
 197                                 struct sk_buff *skb,
 198                                 struct ath_rx_status *rx_stats,
 199                                 struct ieee80211_rx_status *rx_status,
 200                                 bool *decrypt_error)
 201 {
 202         struct ath_hw *ah = common->ah;
 203
 204         memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
 205         if (!ath9k_rx_accept(common, skb, rx_status, rx_stats, decrypt_error))
 206                 return -EINVAL;
 207
 208         ath9k_process_rssi(common, hw, skb, rx_stats);
 209
 210         rx_status->rate_idx = ath9k_process_rate(common, hw,
 211                                                  rx_stats, rx_status, skb);
 212         rx_status->mactime = ath9k_hw_extend_tsf(ah, rx_stats->rs_tstamp);
 213         rx_status->band = hw->conf.channel->band;
 214         rx_status->freq = hw->conf.channel->center_freq;
 215         rx_status->noise = common->ani.noise_floor;
 216         rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + rx_stats->rs_rssi;
 217         rx_status->antenna = rx_stats->rs_antenna;
 218         rx_status->flag |= RX_FLAG_TSFT;
 219
 220         return 0;
 221 }
 222 EXPORT_SYMBOL(ath9k_cmn_rx_skb_preprocess);
 223
 224 void ath9k_cmn_rx_skb_postprocess(struct ath_common *common,
 225                                   struct sk_buff *skb,
 226                                   struct ath_rx_status *rx_stats,
 227                                   struct ieee80211_rx_status *rxs,
 228                                   bool decrypt_error)
 229 {
 230         struct ath_hw *ah = common->ah;
 231         struct ieee80211_hdr *hdr;
 232         int hdrlen, padpos, padsize;
 233         u8 keyix;
 234         __le16 fc;
 235
 236         /* see if any padding is done by the hw and remove it */
 237         hdr = (struct ieee80211_hdr *) skb->data;
 238         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 239         fc = hdr->frame_control;
 240         padpos = ath9k_cmn_padpos(hdr->frame_control);
 241
 242         /* The MAC header is padded to have 32-bit boundary if the
 243          * packet payload is non-zero. The general calculation for
 244          * padsize would take into account odd header lengths:
 245          * padsize = (4 - padpos % 4) % 4; However, since only
 246          * even-length headers are used, padding can only be 0 or 2
 247          * bytes and we can optimize this a bit. In addition, we must
 248          * not try to remove padding from short control frames that do
 249          * not have payload. */
 250         padsize = padpos & 3;
 251         if (padsize && skb->len>=padpos+padsize+FCS_LEN) {
 252                 memmove(skb->data + padsize, skb->data, padpos);
 253                 skb_pull(skb, padsize);
 254         }
 255
 256         keyix = rx_stats->rs_keyix;
 257
 258         if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error &&
 259             ieee80211_has_protected(fc)) {
 260                 rxs->flag |= RX_FLAG_DECRYPTED;
 261         } else if (ieee80211_has_protected(fc)
 262                    && !decrypt_error && skb->len >= hdrlen + 4) {
 263                 keyix = skb->data[hdrlen + 3] >> 6;
 264
 265                 if (test_bit(keyix, common->keymap))
 266                         rxs->flag |= RX_FLAG_DECRYPTED;
 267         }
 268         if (ah->sw_mgmt_crypto &&
 269             (rxs->flag & RX_FLAG_DECRYPTED) &&
 270             ieee80211_is_mgmt(fc))
 271                 /* Use software decrypt for management frames. */
 272                 rxs->flag &= ~RX_FLAG_DECRYPTED;
 273 }
 274 EXPORT_SYMBOL(ath9k_cmn_rx_skb_postprocess);
 275
 276 int ath9k_cmn_padpos(__le16 frame_control)
 277 {
 278         int padpos = 24;
 279         if (ieee80211_has_a4(frame_control)) {
 280                 padpos += ETH_ALEN;
 281         }
 282         if (ieee80211_is_data_qos(frame_control)) {
 283                 padpos += IEEE80211_QOS_CTL_LEN;
 284         }
 285
 286         return padpos;
 287 }
 288 EXPORT_SYMBOL(ath9k_cmn_padpos);
 289
 290 int ath9k_cmn_get_hw_crypto_keytype(struct sk_buff *skb)
 291 {
 292         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 293
 294         if (tx_info->control.hw_key) {
 295                 if (tx_info->control.hw_key->alg == ALG_WEP)
 296                         return ATH9K_KEY_TYPE_WEP;
 297                 else if (tx_info->control.hw_key->alg == ALG_TKIP)
 298                         return ATH9K_KEY_TYPE_TKIP;
 299                 else if (tx_info->control.hw_key->alg == ALG_CCMP)
 300                         return ATH9K_KEY_TYPE_AES;
 301         }
 302
 303         return ATH9K_KEY_TYPE_CLEAR;
 304 }
 305 EXPORT_SYMBOL(ath9k_cmn_get_hw_crypto_keytype);
 306
 307 static u32 ath9k_get_extchanmode(struct ieee80211_channel *chan,
 308                                  enum nl80211_channel_type channel_type)
 309 {
 310         u32 chanmode = 0;
 311
 312         switch (chan->band) {
 313         case IEEE80211_BAND_2GHZ:
 314                 switch (channel_type) {
 315                 case NL80211_CHAN_NO_HT:
 316                 case NL80211_CHAN_HT20:
 317                         chanmode = CHANNEL_G_HT20;
 318                         break;
 319                 case NL80211_CHAN_HT40PLUS:
 320                         chanmode = CHANNEL_G_HT40PLUS;
 321                         break;
 322                 case NL80211_CHAN_HT40MINUS:
 323                         chanmode = CHANNEL_G_HT40MINUS;
 324                         break;
 325                 }
 326                 break;
 327         case IEEE80211_BAND_5GHZ:
 328                 switch (channel_type) {
 329                 case NL80211_CHAN_NO_HT:
 330                 case NL80211_CHAN_HT20:
 331                         chanmode = CHANNEL_A_HT20;
 332                         break;
 333                 case NL80211_CHAN_HT40PLUS:
 334                         chanmode = CHANNEL_A_HT40PLUS;
 335                         break;
 336                 case NL80211_CHAN_HT40MINUS:
 337                         chanmode = CHANNEL_A_HT40MINUS;
 338                         break;
 339                 }
 340                 break;
 341         default:
 342                 break;
 343         }
 344
 345         return chanmode;
 346 }
 347
 348 /*
 349  * Update internal channel flags.
 350  */
 351 void ath9k_cmn_update_ichannel(struct ieee80211_hw *hw,
 352                                struct ath9k_channel *ichan)
 353 {
 354         struct ieee80211_channel *chan = hw->conf.channel;
 355         struct ieee80211_conf *conf = &hw->conf;
 356
 357         ichan->channel = chan->center_freq;
 358         ichan->chan = chan;
 359
 360         if (chan->band == IEEE80211_BAND_2GHZ) {
 361                 ichan->chanmode = CHANNEL_G;
 362                 ichan->channelFlags = CHANNEL_2GHZ | CHANNEL_OFDM | CHANNEL_G;
 363         } else {
 364                 ichan->chanmode = CHANNEL_A;
 365                 ichan->channelFlags = CHANNEL_5GHZ | CHANNEL_OFDM;
 366         }
 367
 368         if (conf_is_ht(conf))
 369                 ichan->chanmode = ath9k_get_extchanmode(chan,
 370                                                         conf->channel_type);
 371 }
 372 EXPORT_SYMBOL(ath9k_cmn_update_ichannel);
 373
 374 /*
 375  * Get the internal channel reference.
 376  */
 377 struct ath9k_channel *ath9k_cmn_get_curchannel(struct ieee80211_hw *hw,
 378                                                struct ath_hw *ah)
 379 {
 380         struct ieee80211_channel *curchan = hw->conf.channel;
 381         struct ath9k_channel *channel;
 382         u8 chan_idx;
 383
 384         chan_idx = curchan->hw_value;
 385         channel = &ah->channels[chan_idx];
 386         ath9k_cmn_update_ichannel(hw, channel);
 387
 388         return channel;
 389 }
 390 EXPORT_SYMBOL(ath9k_cmn_get_curchannel);
 391
 392 static int ath_setkey_tkip(struct ath_common *common, u16 keyix, const u8 *key,
 393                            struct ath9k_keyval *hk, const u8 *addr,
 394                            bool authenticator)
 395 {
 396         struct ath_hw *ah = common->ah;
 397         const u8 *key_rxmic;
 398         const u8 *key_txmic;
 399
 400         key_txmic = key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
 401         key_rxmic = key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
 402
 403         if (addr == NULL) {
 404                 /*
 405                  * Group key installation - only two key cache entries are used
 406                  * regardless of splitmic capability since group key is only
 407                  * used either for TX or RX.
 408                  */
 409                 if (authenticator) {
 410                         memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
 411                         memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_mic));
 412                 } else {
 413                         memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
 414                         memcpy(hk->kv_txmic, key_rxmic, sizeof(hk->kv_mic));
 415                 }
 416                 return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr);
 417         }
 418         if (!common->splitmic) {
 419                 /* TX and RX keys share the same key cache entry. */
 420                 memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
 421                 memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_txmic));
 422                 return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr);
 423         }
 424
 425         /* Separate key cache entries for TX and RX */
 426
 427         /* TX key goes at first index, RX key at +32. */
 428         memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
 429         if (!ath9k_hw_set_keycache_entry(ah, keyix, hk, NULL)) {
 430                 /* TX MIC entry failed. No need to proceed further */
 431                 ath_print(common, ATH_DBG_FATAL,
 432                           "Setting TX MIC Key Failed\n");
 433                 return 0;
 434         }
 435
 436         memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
 437         /* XXX delete tx key on failure? */
 438         return ath9k_hw_set_keycache_entry(ah, keyix + 32, hk, addr);
 439 }
 440
 441 static int ath_reserve_key_cache_slot_tkip(struct ath_common *common)
 442 {
 443         int i;
 444
 445         for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
 446                 if (test_bit(i, common->keymap) ||
 447                     test_bit(i + 64, common->keymap))
 448                         continue; /* At least one part of TKIP key allocated */
 449                 if (common->splitmic &&
 450                     (test_bit(i + 32, common->keymap) ||
 451                      test_bit(i + 64 + 32, common->keymap)))
 452                         continue; /* At least one part of TKIP key allocated */
 453
 454                 /* Found a free slot for a TKIP key */
 455                 return i;
 456         }
 457         return -1;
 458 }
 459
 460 static int ath_reserve_key_cache_slot(struct ath_common *common)
 461 {
 462         int i;
 463
 464         /* First, try to find slots that would not be available for TKIP. */
 465         if (common->splitmic) {
 466                 for (i = IEEE80211_WEP_NKID; i < common->keymax / 4; i++) {
 467                         if (!test_bit(i, common->keymap) &&
 468                             (test_bit(i + 32, common->keymap) ||
 469                              test_bit(i + 64, common->keymap) ||
 470                              test_bit(i + 64 + 32, common->keymap)))
 471                                 return i;
 472                         if (!test_bit(i + 32, common->keymap) &&
 473                             (test_bit(i, common->keymap) ||
 474                              test_bit(i + 64, common->keymap) ||
 475                              test_bit(i + 64 + 32, common->keymap)))
 476                                 return i + 32;
 477                         if (!test_bit(i + 64, common->keymap) &&
 478                             (test_bit(i , common->keymap) ||
 479                              test_bit(i + 32, common->keymap) ||
 480                              test_bit(i + 64 + 32, common->keymap)))
 481                                 return i + 64;
 482                         if (!test_bit(i + 64 + 32, common->keymap) &&
 483                             (test_bit(i, common->keymap) ||
 484                              test_bit(i + 32, common->keymap) ||
 485                              test_bit(i + 64, common->keymap)))
 486                                 return i + 64 + 32;
 487                 }
 488         } else {
 489                 for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
 490                         if (!test_bit(i, common->keymap) &&
 491                             test_bit(i + 64, common->keymap))
 492                                 return i;
 493                         if (test_bit(i, common->keymap) &&
 494                             !test_bit(i + 64, common->keymap))
 495                                 return i + 64;
 496                 }
 497         }
 498
 499         /* No partially used TKIP slots, pick any available slot */
 500         for (i = IEEE80211_WEP_NKID; i < common->keymax; i++) {
 501                 /* Do not allow slots that could be needed for TKIP group keys
 502                  * to be used. This limitation could be removed if we know that
 503                  * TKIP will not be used. */
 504                 if (i >= 64 && i < 64 + IEEE80211_WEP_NKID)
 505                         continue;
 506                 if (common->splitmic) {
 507                         if (i >= 32 && i < 32 + IEEE80211_WEP_NKID)
 508                                 continue;
 509                         if (i >= 64 + 32 && i < 64 + 32 + IEEE80211_WEP_NKID)
 510                                 continue;
 511                 }
 512
 513                 if (!test_bit(i, common->keymap))
 514                         return i; /* Found a free slot for a key */
 515         }
 516
 517         /* No free slot found */
 518         return -1;
 519 }
 520
 521 /*
 522  * Configure encryption in the HW.
 523  */
 524 int ath9k_cmn_key_config(struct ath_common *common,
 525                          struct ieee80211_vif *vif,
 526                          struct ieee80211_sta *sta,
 527                          struct ieee80211_key_conf *key)
 528 {
 529         struct ath_hw *ah = common->ah;
 530         struct ath9k_keyval hk;
 531         const u8 *mac = NULL;
 532         int ret = 0;
 533         int idx;
 534
 535         memset(&hk, 0, sizeof(hk));
 536
 537         switch (key->alg) {
 538         case ALG_WEP:
 539                 hk.kv_type = ATH9K_CIPHER_WEP;
 540                 break;
 541         case ALG_TKIP:
 542                 hk.kv_type = ATH9K_CIPHER_TKIP;
 543                 break;
 544         case ALG_CCMP:
 545                 hk.kv_type = ATH9K_CIPHER_AES_CCM;
 546                 break;
 547         default:
 548                 return -EOPNOTSUPP;
 549         }
 550
 551         hk.kv_len = key->keylen;
 552         memcpy(hk.kv_val, key->key, key->keylen);
 553
 554         if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 555                 /* For now, use the default keys for broadcast keys. This may
 556                  * need to change with virtual interfaces. */
 557                 idx = key->keyidx;
 558         } else if (key->keyidx) {
 559                 if (WARN_ON(!sta))
 560                         return -EOPNOTSUPP;
 561                 mac = sta->addr;
 562
 563                 if (vif->type != NL80211_IFTYPE_AP) {
 564                         /* Only keyidx 0 should be used with unicast key, but
 565                          * allow this for client mode for now. */
 566                         idx = key->keyidx;
 567                 } else
 568                         return -EIO;
 569         } else {
 570                 if (WARN_ON(!sta))
 571                         return -EOPNOTSUPP;
 572                 mac = sta->addr;
 573
 574                 if (key->alg == ALG_TKIP)
 575                         idx = ath_reserve_key_cache_slot_tkip(common);
 576                 else
 577                         idx = ath_reserve_key_cache_slot(common);
 578                 if (idx < 0)
 579                         return -ENOSPC; /* no free key cache entries */
 580         }
 581
 582         if (key->alg == ALG_TKIP)
 583                 ret = ath_setkey_tkip(common, idx, key->key, &hk, mac,
 584                                       vif->type == NL80211_IFTYPE_AP);
 585         else
 586                 ret = ath9k_hw_set_keycache_entry(ah, idx, &hk, mac);
 587
 588         if (!ret)
 589                 return -EIO;
 590
 591         set_bit(idx, common->keymap);
 592         if (key->alg == ALG_TKIP) {
 593                 set_bit(idx + 64, common->keymap);
 594                 if (common->splitmic) {
 595                         set_bit(idx + 32, common->keymap);
 596                         set_bit(idx + 64 + 32, common->keymap);
 597                 }
 598         }
 599
 600         return idx;
 601 }
 602 EXPORT_SYMBOL(ath9k_cmn_key_config);
 603
 604 /*
 605  * Delete Key.
 606  */
 607 void ath9k_cmn_key_delete(struct ath_common *common,
 608                           struct ieee80211_key_conf *key)
 609 {
 610         struct ath_hw *ah = common->ah;
 611
 612         ath9k_hw_keyreset(ah, key->hw_key_idx);
 613         if (key->hw_key_idx < IEEE80211_WEP_NKID)
 614                 return;
 615
 616         clear_bit(key->hw_key_idx, common->keymap);
 617         if (key->alg != ALG_TKIP)
 618                 return;
 619
 620         clear_bit(key->hw_key_idx + 64, common->keymap);
 621         if (common->splitmic) {
 622                 ath9k_hw_keyreset(ah, key->hw_key_idx + 32);
 623                 clear_bit(key->hw_key_idx + 32, common->keymap);
 624                 clear_bit(key->hw_key_idx + 64 + 32, common->keymap);
 625         }
 626 }
 627 EXPORT_SYMBOL(ath9k_cmn_key_delete);
 628
 629 static int __init ath9k_cmn_init(void)
 630 {
 631         return 0;
 632 }
 633 module_init(ath9k_cmn_init);
 634
 635 static void __exit ath9k_cmn_exit(void)
 636 {
 637         return;
 638 }
 639 module_exit(ath9k_cmn_exit);