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->signal = ATH_DEFAULT_NOISE_FLOOR + rx_stats->rs_rssi;
 216         rx_status->antenna = rx_stats->rs_antenna;
 217         rx_status->flag |= RX_FLAG_TSFT;
 218
 219         return 0;
 220 }
 221 EXPORT_SYMBOL(ath9k_cmn_rx_skb_preprocess);
 222
 223 void ath9k_cmn_rx_skb_postprocess(struct ath_common *common,
 224                                   struct sk_buff *skb,
 225                                   struct ath_rx_status *rx_stats,
 226                                   struct ieee80211_rx_status *rxs,
 227                                   bool decrypt_error)
 228 {
 229         struct ath_hw *ah = common->ah;
 230         struct ieee80211_hdr *hdr;
 231         int hdrlen, padpos, padsize;
 232         u8 keyix;
 233         __le16 fc;
 234
 235         /* see if any padding is done by the hw and remove it */
 236         hdr = (struct ieee80211_hdr *) skb->data;
 237         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 238         fc = hdr->frame_control;
 239         padpos = ath9k_cmn_padpos(hdr->frame_control);
 240
 241         /* The MAC header is padded to have 32-bit boundary if the
 242          * packet payload is non-zero. The general calculation for
 243          * padsize would take into account odd header lengths:
 244          * padsize = (4 - padpos % 4) % 4; However, since only
 245          * even-length headers are used, padding can only be 0 or 2
 246          * bytes and we can optimize this a bit. In addition, we must
 247          * not try to remove padding from short control frames that do
 248          * not have payload. */
 249         padsize = padpos & 3;
 250         if (padsize && skb->len>=padpos+padsize+FCS_LEN) {
 251                 memmove(skb->data + padsize, skb->data, padpos);
 252                 skb_pull(skb, padsize);
 253         }
 254
 255         keyix = rx_stats->rs_keyix;
 256
 257         if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error &&
 258             ieee80211_has_protected(fc)) {
 259                 rxs->flag |= RX_FLAG_DECRYPTED;
 260         } else if (ieee80211_has_protected(fc)
 261                    && !decrypt_error && skb->len >= hdrlen + 4) {
 262                 keyix = skb->data[hdrlen + 3] >> 6;
 263
 264                 if (test_bit(keyix, common->keymap))
 265                         rxs->flag |= RX_FLAG_DECRYPTED;
 266         }
 267         if (ah->sw_mgmt_crypto &&
 268             (rxs->flag & RX_FLAG_DECRYPTED) &&
 269             ieee80211_is_mgmt(fc))
 270                 /* Use software decrypt for management frames. */
 271                 rxs->flag &= ~RX_FLAG_DECRYPTED;
 272 }
 273 EXPORT_SYMBOL(ath9k_cmn_rx_skb_postprocess);
 274
 275 int ath9k_cmn_padpos(__le16 frame_control)
 276 {
 277         int padpos = 24;
 278         if (ieee80211_has_a4(frame_control)) {
 279                 padpos += ETH_ALEN;
 280         }
 281         if (ieee80211_is_data_qos(frame_control)) {
 282                 padpos += IEEE80211_QOS_CTL_LEN;
 283         }
 284
 285         return padpos;
 286 }
 287 EXPORT_SYMBOL(ath9k_cmn_padpos);
 288
 289 int ath9k_cmn_get_hw_crypto_keytype(struct sk_buff *skb)
 290 {
 291         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 292
 293         if (tx_info->control.hw_key) {
 294                 if (tx_info->control.hw_key->alg == ALG_WEP)
 295                         return ATH9K_KEY_TYPE_WEP;
 296                 else if (tx_info->control.hw_key->alg == ALG_TKIP)
 297                         return ATH9K_KEY_TYPE_TKIP;
 298                 else if (tx_info->control.hw_key->alg == ALG_CCMP)
 299                         return ATH9K_KEY_TYPE_AES;
 300         }
 301
 302         return ATH9K_KEY_TYPE_CLEAR;
 303 }
 304 EXPORT_SYMBOL(ath9k_cmn_get_hw_crypto_keytype);
 305
 306 static u32 ath9k_get_extchanmode(struct ieee80211_channel *chan,
 307                                  enum nl80211_channel_type channel_type)
 308 {
 309         u32 chanmode = 0;
 310
 311         switch (chan->band) {
 312         case IEEE80211_BAND_2GHZ:
 313                 switch (channel_type) {
 314                 case NL80211_CHAN_NO_HT:
 315                 case NL80211_CHAN_HT20:
 316                         chanmode = CHANNEL_G_HT20;
 317                         break;
 318                 case NL80211_CHAN_HT40PLUS:
 319                         chanmode = CHANNEL_G_HT40PLUS;
 320                         break;
 321                 case NL80211_CHAN_HT40MINUS:
 322                         chanmode = CHANNEL_G_HT40MINUS;
 323                         break;
 324                 }
 325                 break;
 326         case IEEE80211_BAND_5GHZ:
 327                 switch (channel_type) {
 328                 case NL80211_CHAN_NO_HT:
 329                 case NL80211_CHAN_HT20:
 330                         chanmode = CHANNEL_A_HT20;
 331                         break;
 332                 case NL80211_CHAN_HT40PLUS:
 333                         chanmode = CHANNEL_A_HT40PLUS;
 334                         break;
 335                 case NL80211_CHAN_HT40MINUS:
 336                         chanmode = CHANNEL_A_HT40MINUS;
 337                         break;
 338                 }
 339                 break;
 340         default:
 341                 break;
 342         }
 343
 344         return chanmode;
 345 }
 346
 347 /*
 348  * Update internal channel flags.
 349  */
 350 void ath9k_cmn_update_ichannel(struct ieee80211_hw *hw,
 351                                struct ath9k_channel *ichan)
 352 {
 353         struct ieee80211_channel *chan = hw->conf.channel;
 354         struct ieee80211_conf *conf = &hw->conf;
 355
 356         ichan->channel = chan->center_freq;
 357         ichan->chan = chan;
 358
 359         if (chan->band == IEEE80211_BAND_2GHZ) {
 360                 ichan->chanmode = CHANNEL_G;
 361                 ichan->channelFlags = CHANNEL_2GHZ | CHANNEL_OFDM | CHANNEL_G;
 362         } else {
 363                 ichan->chanmode = CHANNEL_A;
 364                 ichan->channelFlags = CHANNEL_5GHZ | CHANNEL_OFDM;
 365         }
 366
 367         if (conf_is_ht(conf))
 368                 ichan->chanmode = ath9k_get_extchanmode(chan,
 369                                                         conf->channel_type);
 370 }
 371 EXPORT_SYMBOL(ath9k_cmn_update_ichannel);
 372
 373 /*
 374  * Get the internal channel reference.
 375  */
 376 struct ath9k_channel *ath9k_cmn_get_curchannel(struct ieee80211_hw *hw,
 377                                                struct ath_hw *ah)
 378 {
 379         struct ieee80211_channel *curchan = hw->conf.channel;
 380         struct ath9k_channel *channel;
 381         u8 chan_idx;
 382
 383         chan_idx = curchan->hw_value;
 384         channel = &ah->channels[chan_idx];
 385         ath9k_cmn_update_ichannel(hw, channel);
 386
 387         return channel;
 388 }
 389 EXPORT_SYMBOL(ath9k_cmn_get_curchannel);
 390
 391 static int ath_setkey_tkip(struct ath_common *common, u16 keyix, const u8 *key,
 392                            struct ath9k_keyval *hk, const u8 *addr,
 393                            bool authenticator)
 394 {
 395         struct ath_hw *ah = common->ah;
 396         const u8 *key_rxmic;
 397         const u8 *key_txmic;
 398
 399         key_txmic = key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
 400         key_rxmic = key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
 401
 402         if (addr == NULL) {
 403                 /*
 404                  * Group key installation - only two key cache entries are used
 405                  * regardless of splitmic capability since group key is only
 406                  * used either for TX or RX.
 407                  */
 408                 if (authenticator) {
 409                         memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
 410                         memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_mic));
 411                 } else {
 412                         memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
 413                         memcpy(hk->kv_txmic, key_rxmic, sizeof(hk->kv_mic));
 414                 }
 415                 return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr);
 416         }
 417         if (!common->splitmic) {
 418                 /* TX and RX keys share the same key cache entry. */
 419                 memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
 420                 memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_txmic));
 421                 return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr);
 422         }
 423
 424         /* Separate key cache entries for TX and RX */
 425
 426         /* TX key goes at first index, RX key at +32. */
 427         memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
 428         if (!ath9k_hw_set_keycache_entry(ah, keyix, hk, NULL)) {
 429                 /* TX MIC entry failed. No need to proceed further */
 430                 ath_print(common, ATH_DBG_FATAL,
 431                           "Setting TX MIC Key Failed\n");
 432                 return 0;
 433         }
 434
 435         memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
 436         /* XXX delete tx key on failure? */
 437         return ath9k_hw_set_keycache_entry(ah, keyix + 32, hk, addr);
 438 }
 439
 440 static int ath_reserve_key_cache_slot_tkip(struct ath_common *common)
 441 {
 442         int i;
 443
 444         for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
 445                 if (test_bit(i, common->keymap) ||
 446                     test_bit(i + 64, common->keymap))
 447                         continue; /* At least one part of TKIP key allocated */
 448                 if (common->splitmic &&
 449                     (test_bit(i + 32, common->keymap) ||
 450                      test_bit(i + 64 + 32, common->keymap)))
 451                         continue; /* At least one part of TKIP key allocated */
 452
 453                 /* Found a free slot for a TKIP key */
 454                 return i;
 455         }
 456         return -1;
 457 }
 458
 459 static int ath_reserve_key_cache_slot(struct ath_common *common)
 460 {
 461         int i;
 462
 463         /* First, try to find slots that would not be available for TKIP. */
 464         if (common->splitmic) {
 465                 for (i = IEEE80211_WEP_NKID; i < common->keymax / 4; i++) {
 466                         if (!test_bit(i, common->keymap) &&
 467                             (test_bit(i + 32, common->keymap) ||
 468                              test_bit(i + 64, common->keymap) ||
 469                              test_bit(i + 64 + 32, common->keymap)))
 470                                 return i;
 471                         if (!test_bit(i + 32, common->keymap) &&
 472                             (test_bit(i, common->keymap) ||
 473                              test_bit(i + 64, common->keymap) ||
 474                              test_bit(i + 64 + 32, common->keymap)))
 475                                 return i + 32;
 476                         if (!test_bit(i + 64, common->keymap) &&
 477                             (test_bit(i , common->keymap) ||
 478                              test_bit(i + 32, common->keymap) ||
 479                              test_bit(i + 64 + 32, common->keymap)))
 480                                 return i + 64;
 481                         if (!test_bit(i + 64 + 32, common->keymap) &&
 482                             (test_bit(i, common->keymap) ||
 483                              test_bit(i + 32, common->keymap) ||
 484                              test_bit(i + 64, common->keymap)))
 485                                 return i + 64 + 32;
 486                 }
 487         } else {
 488                 for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
 489                         if (!test_bit(i, common->keymap) &&
 490                             test_bit(i + 64, common->keymap))
 491                                 return i;
 492                         if (test_bit(i, common->keymap) &&
 493                             !test_bit(i + 64, common->keymap))
 494                                 return i + 64;
 495                 }
 496         }
 497
 498         /* No partially used TKIP slots, pick any available slot */
 499         for (i = IEEE80211_WEP_NKID; i < common->keymax; i++) {
 500                 /* Do not allow slots that could be needed for TKIP group keys
 501                  * to be used. This limitation could be removed if we know that
 502                  * TKIP will not be used. */
 503                 if (i >= 64 && i < 64 + IEEE80211_WEP_NKID)
 504                         continue;
 505                 if (common->splitmic) {
 506                         if (i >= 32 && i < 32 + IEEE80211_WEP_NKID)
 507                                 continue;
 508                         if (i >= 64 + 32 && i < 64 + 32 + IEEE80211_WEP_NKID)
 509                                 continue;
 510                 }
 511
 512                 if (!test_bit(i, common->keymap))
 513                         return i; /* Found a free slot for a key */
 514         }
 515
 516         /* No free slot found */
 517         return -1;
 518 }
 519
 520 /*
 521  * Configure encryption in the HW.
 522  */
 523 int ath9k_cmn_key_config(struct ath_common *common,
 524                          struct ieee80211_vif *vif,
 525                          struct ieee80211_sta *sta,
 526                          struct ieee80211_key_conf *key)
 527 {
 528         struct ath_hw *ah = common->ah;
 529         struct ath9k_keyval hk;
 530         const u8 *mac = NULL;
 531         int ret = 0;
 532         int idx;
 533
 534         memset(&hk, 0, sizeof(hk));
 535
 536         switch (key->alg) {
 537         case ALG_WEP:
 538                 hk.kv_type = ATH9K_CIPHER_WEP;
 539                 break;
 540         case ALG_TKIP:
 541                 hk.kv_type = ATH9K_CIPHER_TKIP;
 542                 break;
 543         case ALG_CCMP:
 544                 hk.kv_type = ATH9K_CIPHER_AES_CCM;
 545                 break;
 546         default:
 547                 return -EOPNOTSUPP;
 548         }
 549
 550         hk.kv_len = key->keylen;
 551         memcpy(hk.kv_val, key->key, key->keylen);
 552
 553         if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 554                 /* For now, use the default keys for broadcast keys. This may
 555                  * need to change with virtual interfaces. */
 556                 idx = key->keyidx;
 557         } else if (key->keyidx) {
 558                 if (WARN_ON(!sta))
 559                         return -EOPNOTSUPP;
 560                 mac = sta->addr;
 561
 562                 if (vif->type != NL80211_IFTYPE_AP) {
 563                         /* Only keyidx 0 should be used with unicast key, but
 564                          * allow this for client mode for now. */
 565                         idx = key->keyidx;
 566                 } else
 567                         return -EIO;
 568         } else {
 569                 if (WARN_ON(!sta))
 570                         return -EOPNOTSUPP;
 571                 mac = sta->addr;
 572
 573                 if (key->alg == ALG_TKIP)
 574                         idx = ath_reserve_key_cache_slot_tkip(common);
 575                 else
 576                         idx = ath_reserve_key_cache_slot(common);
 577                 if (idx < 0)
 578                         return -ENOSPC; /* no free key cache entries */
 579         }
 580
 581         if (key->alg == ALG_TKIP)
 582                 ret = ath_setkey_tkip(common, idx, key->key, &hk, mac,
 583                                       vif->type == NL80211_IFTYPE_AP);
 584         else
 585                 ret = ath9k_hw_set_keycache_entry(ah, idx, &hk, mac);
 586
 587         if (!ret)
 588                 return -EIO;
 589
 590         set_bit(idx, common->keymap);
 591         if (key->alg == ALG_TKIP) {
 592                 set_bit(idx + 64, common->keymap);
 593                 if (common->splitmic) {
 594                         set_bit(idx + 32, common->keymap);
 595                         set_bit(idx + 64 + 32, common->keymap);
 596                 }
 597         }
 598
 599         return idx;
 600 }
 601 EXPORT_SYMBOL(ath9k_cmn_key_config);
 602
 603 /*
 604  * Delete Key.
 605  */
 606 void ath9k_cmn_key_delete(struct ath_common *common,
 607                           struct ieee80211_key_conf *key)
 608 {
 609         struct ath_hw *ah = common->ah;
 610
 611         ath9k_hw_keyreset(ah, key->hw_key_idx);
 612         if (key->hw_key_idx < IEEE80211_WEP_NKID)
 613                 return;
 614
 615         clear_bit(key->hw_key_idx, common->keymap);
 616         if (key->alg != ALG_TKIP)
 617                 return;
 618
 619         clear_bit(key->hw_key_idx + 64, common->keymap);
 620         if (common->splitmic) {
 621                 ath9k_hw_keyreset(ah, key->hw_key_idx + 32);
 622                 clear_bit(key->hw_key_idx + 32, common->keymap);
 623                 clear_bit(key->hw_key_idx + 64 + 32, common->keymap);
 624         }
 625 }
 626 EXPORT_SYMBOL(ath9k_cmn_key_delete);
 627
 628 static int __init ath9k_cmn_init(void)
 629 {
 630         return 0;
 631 }
 632 module_init(ath9k_cmn_init);
 633
 634 static void __exit ath9k_cmn_exit(void)
 635 {
 636         return;
 637 }
 638 module_exit(ath9k_cmn_exit);