drivers/net/wireless/iwlwifi/iwl-core.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2012 Intel Corporation. All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  19  * USA
  20  *
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *****************************************************************************/
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/sched.h>
  33 #include <linux/slab.h>
  34 #include <net/mac80211.h>
  35
  36 #include "iwl-eeprom.h"
  37 #include "iwl-debug.h"
  38 #include "iwl-core.h"
  39 #include "iwl-io.h"
  40 #include "iwl-power.h"
  41 #include "iwl-shared.h"
  42 #include "iwl-agn.h"
  43 #include "iwl-trans.h"
  44
  45 const u8 iwl_bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  46
  47 static bool iwl_is_channel_extension(struct iwl_priv *priv,
  48                                      enum ieee80211_band band,
  49                                      u16 channel, u8 extension_chan_offset)
  50 {
  51         const struct iwl_channel_info *ch_info;
  52
  53         ch_info = iwl_get_channel_info(priv, band, channel);
  54         if (!is_channel_valid(ch_info))
  55                 return false;
  56
  57         if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_ABOVE)
  58                 return !(ch_info->ht40_extension_channel &
  59                                         IEEE80211_CHAN_NO_HT40PLUS);
  60         else if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_BELOW)
  61                 return !(ch_info->ht40_extension_channel &
  62                                         IEEE80211_CHAN_NO_HT40MINUS);
  63
  64         return false;
  65 }
  66
  67 bool iwl_is_ht40_tx_allowed(struct iwl_priv *priv,
  68                             struct iwl_rxon_context *ctx,
  69                             struct ieee80211_sta_ht_cap *ht_cap)
  70 {
  71         if (!ctx->ht.enabled || !ctx->ht.is_40mhz)
  72                 return false;
  73
  74         /*
  75          * We do not check for IEEE80211_HT_CAP_SUP_WIDTH_20_40
  76          * the bit will not set if it is pure 40MHz case
  77          */
  78         if (ht_cap && !ht_cap->ht_supported)
  79                 return false;
  80
  81 #ifdef CONFIG_IWLWIFI_DEBUGFS
  82         if (priv->disable_ht40)
  83                 return false;
  84 #endif
  85
  86         return iwl_is_channel_extension(priv, priv->band,
  87                         le16_to_cpu(ctx->staging.channel),
  88                         ctx->ht.extension_chan_offset);
  89 }
  90
  91 static u16 iwl_adjust_beacon_interval(u16 beacon_val, u16 max_beacon_val)
  92 {
  93         u16 new_val;
  94         u16 beacon_factor;
  95
  96         /*
  97          * If mac80211 hasn't given us a beacon interval, program
  98          * the default into the device (not checking this here
  99          * would cause the adjustment below to return the maximum
 100          * value, which may break PAN.)
 101          */
 102         if (!beacon_val)
 103                 return DEFAULT_BEACON_INTERVAL;
 104
 105         /*
 106          * If the beacon interval we obtained from the peer
 107          * is too large, we'll have to wake up more often
 108          * (and in IBSS case, we'll beacon too much)
 109          *
 110          * For example, if max_beacon_val is 4096, and the
 111          * requested beacon interval is 7000, we'll have to
 112          * use 3500 to be able to wake up on the beacons.
 113          *
 114          * This could badly influence beacon detection stats.
 115          */
 116
 117         beacon_factor = (beacon_val + max_beacon_val) / max_beacon_val;
 118         new_val = beacon_val / beacon_factor;
 119
 120         if (!new_val)
 121                 new_val = max_beacon_val;
 122
 123         return new_val;
 124 }
 125
 126 int iwl_send_rxon_timing(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 127 {
 128         u64 tsf;
 129         s32 interval_tm, rem;
 130         struct ieee80211_conf *conf = NULL;
 131         u16 beacon_int;
 132         struct ieee80211_vif *vif = ctx->vif;
 133
 134         conf = &priv->hw->conf;
 135
 136         lockdep_assert_held(&priv->mutex);
 137
 138         memset(&ctx->timing, 0, sizeof(struct iwl_rxon_time_cmd));
 139
 140         ctx->timing.timestamp = cpu_to_le64(priv->timestamp);
 141         ctx->timing.listen_interval = cpu_to_le16(conf->listen_interval);
 142
 143         beacon_int = vif ? vif->bss_conf.beacon_int : 0;
 144
 145         /*
 146          * TODO: For IBSS we need to get atim_window from mac80211,
 147          *       for now just always use 0
 148          */
 149         ctx->timing.atim_window = 0;
 150
 151         if (ctx->ctxid == IWL_RXON_CTX_PAN &&
 152             (!ctx->vif || ctx->vif->type != NL80211_IFTYPE_STATION) &&
 153             iwl_is_associated(priv, IWL_RXON_CTX_BSS) &&
 154             priv->contexts[IWL_RXON_CTX_BSS].vif &&
 155             priv->contexts[IWL_RXON_CTX_BSS].vif->bss_conf.beacon_int) {
 156                 ctx->timing.beacon_interval =
 157                         priv->contexts[IWL_RXON_CTX_BSS].timing.beacon_interval;
 158                 beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
 159         } else if (ctx->ctxid == IWL_RXON_CTX_BSS &&
 160                    iwl_is_associated(priv, IWL_RXON_CTX_PAN) &&
 161                    priv->contexts[IWL_RXON_CTX_PAN].vif &&
 162                    priv->contexts[IWL_RXON_CTX_PAN].vif->bss_conf.beacon_int &&
 163                    (!iwl_is_associated_ctx(ctx) || !ctx->vif ||
 164                     !ctx->vif->bss_conf.beacon_int)) {
 165                 ctx->timing.beacon_interval =
 166                         priv->contexts[IWL_RXON_CTX_PAN].timing.beacon_interval;
 167                 beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
 168         } else {
 169                 beacon_int = iwl_adjust_beacon_interval(beacon_int,
 170                         IWL_MAX_UCODE_BEACON_INTERVAL * TIME_UNIT);
 171                 ctx->timing.beacon_interval = cpu_to_le16(beacon_int);
 172         }
 173
 174         ctx->beacon_int = beacon_int;
 175
 176         tsf = priv->timestamp; /* tsf is modifed by do_div: copy it */
 177         interval_tm = beacon_int * TIME_UNIT;
 178         rem = do_div(tsf, interval_tm);
 179         ctx->timing.beacon_init_val = cpu_to_le32(interval_tm - rem);
 180
 181         ctx->timing.dtim_period = vif ? (vif->bss_conf.dtim_period ?: 1) : 1;
 182
 183         IWL_DEBUG_ASSOC(priv,
 184                         "beacon interval %d beacon timer %d beacon tim %d\n",
 185                         le16_to_cpu(ctx->timing.beacon_interval),
 186                         le32_to_cpu(ctx->timing.beacon_init_val),
 187                         le16_to_cpu(ctx->timing.atim_window));
 188
 189         return iwl_dvm_send_cmd_pdu(priv, ctx->rxon_timing_cmd,
 190                                 CMD_SYNC, sizeof(ctx->timing), &ctx->timing);
 191 }
 192
 193 void iwl_set_rxon_hwcrypto(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 194                            int hw_decrypt)
 195 {
 196         struct iwl_rxon_cmd *rxon = &ctx->staging;
 197
 198         if (hw_decrypt)
 199                 rxon->filter_flags &= ~RXON_FILTER_DIS_DECRYPT_MSK;
 200         else
 201                 rxon->filter_flags |= RXON_FILTER_DIS_DECRYPT_MSK;
 202
 203 }
 204
 205 /* validate RXON structure is valid */
 206 int iwl_check_rxon_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 207 {
 208         struct iwl_rxon_cmd *rxon = &ctx->staging;
 209         u32 errors = 0;
 210
 211         if (rxon->flags & RXON_FLG_BAND_24G_MSK) {
 212                 if (rxon->flags & RXON_FLG_TGJ_NARROW_BAND_MSK) {
 213                         IWL_WARN(priv, "check 2.4G: wrong narrow\n");
 214                         errors |= BIT(0);
 215                 }
 216                 if (rxon->flags & RXON_FLG_RADAR_DETECT_MSK) {
 217                         IWL_WARN(priv, "check 2.4G: wrong radar\n");
 218                         errors |= BIT(1);
 219                 }
 220         } else {
 221                 if (!(rxon->flags & RXON_FLG_SHORT_SLOT_MSK)) {
 222                         IWL_WARN(priv, "check 5.2G: not short slot!\n");
 223                         errors |= BIT(2);
 224                 }
 225                 if (rxon->flags & RXON_FLG_CCK_MSK) {
 226                         IWL_WARN(priv, "check 5.2G: CCK!\n");
 227                         errors |= BIT(3);
 228                 }
 229         }
 230         if ((rxon->node_addr[0] | rxon->bssid_addr[0]) & 0x1) {
 231                 IWL_WARN(priv, "mac/bssid mcast!\n");
 232                 errors |= BIT(4);
 233         }
 234
 235         /* make sure basic rates 6Mbps and 1Mbps are supported */
 236         if ((rxon->ofdm_basic_rates & IWL_RATE_6M_MASK) == 0 &&
 237             (rxon->cck_basic_rates & IWL_RATE_1M_MASK) == 0) {
 238                 IWL_WARN(priv, "neither 1 nor 6 are basic\n");
 239                 errors |= BIT(5);
 240         }
 241
 242         if (le16_to_cpu(rxon->assoc_id) > 2007) {
 243                 IWL_WARN(priv, "aid > 2007\n");
 244                 errors |= BIT(6);
 245         }
 246
 247         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK))
 248                         == (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) {
 249                 IWL_WARN(priv, "CCK and short slot\n");
 250                 errors |= BIT(7);
 251         }
 252
 253         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK))
 254                         == (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) {
 255                 IWL_WARN(priv, "CCK and auto detect");
 256                 errors |= BIT(8);
 257         }
 258
 259         if ((rxon->flags & (RXON_FLG_AUTO_DETECT_MSK |
 260                             RXON_FLG_TGG_PROTECT_MSK)) ==
 261                             RXON_FLG_TGG_PROTECT_MSK) {
 262                 IWL_WARN(priv, "TGg but no auto-detect\n");
 263                 errors |= BIT(9);
 264         }
 265
 266         if (rxon->channel == 0) {
 267                 IWL_WARN(priv, "zero channel is invalid\n");
 268                 errors |= BIT(10);
 269         }
 270
 271         WARN(errors, "Invalid RXON (%#x), channel %d",
 272              errors, le16_to_cpu(rxon->channel));
 273
 274         return errors ? -EINVAL : 0;
 275 }
 276
 277 /**
 278  * iwl_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
 279  * @priv: staging_rxon is compared to active_rxon
 280  *
 281  * If the RXON structure is changing enough to require a new tune,
 282  * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
 283  * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
 284  */
 285 int iwl_full_rxon_required(struct iwl_priv *priv,
 286                            struct iwl_rxon_context *ctx)
 287 {
 288         const struct iwl_rxon_cmd *staging = &ctx->staging;
 289         const struct iwl_rxon_cmd *active = &ctx->active;
 290
 291 #define CHK(cond)                                                       \
 292         if ((cond)) {                                                   \
 293                 IWL_DEBUG_INFO(priv, "need full RXON - " #cond "\n");   \
 294                 return 1;                                               \
 295         }
 296
 297 #define CHK_NEQ(c1, c2)                                         \
 298         if ((c1) != (c2)) {                                     \
 299                 IWL_DEBUG_INFO(priv, "need full RXON - "        \
 300                                #c1 " != " #c2 " - %d != %d\n",  \
 301                                (c1), (c2));                     \
 302                 return 1;                                       \
 303         }
 304
 305         /* These items are only settable from the full RXON command */
 306         CHK(!iwl_is_associated_ctx(ctx));
 307         CHK(compare_ether_addr(staging->bssid_addr, active->bssid_addr));
 308         CHK(compare_ether_addr(staging->node_addr, active->node_addr));
 309         CHK(compare_ether_addr(staging->wlap_bssid_addr,
 310                                 active->wlap_bssid_addr));
 311         CHK_NEQ(staging->dev_type, active->dev_type);
 312         CHK_NEQ(staging->channel, active->channel);
 313         CHK_NEQ(staging->air_propagation, active->air_propagation);
 314         CHK_NEQ(staging->ofdm_ht_single_stream_basic_rates,
 315                 active->ofdm_ht_single_stream_basic_rates);
 316         CHK_NEQ(staging->ofdm_ht_dual_stream_basic_rates,
 317                 active->ofdm_ht_dual_stream_basic_rates);
 318         CHK_NEQ(staging->ofdm_ht_triple_stream_basic_rates,
 319                 active->ofdm_ht_triple_stream_basic_rates);
 320         CHK_NEQ(staging->assoc_id, active->assoc_id);
 321
 322         /* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
 323          * be updated with the RXON_ASSOC command -- however only some
 324          * flag transitions are allowed using RXON_ASSOC */
 325
 326         /* Check if we are not switching bands */
 327         CHK_NEQ(staging->flags & RXON_FLG_BAND_24G_MSK,
 328                 active->flags & RXON_FLG_BAND_24G_MSK);
 329
 330         /* Check if we are switching association toggle */
 331         CHK_NEQ(staging->filter_flags & RXON_FILTER_ASSOC_MSK,
 332                 active->filter_flags & RXON_FILTER_ASSOC_MSK);
 333
 334 #undef CHK
 335 #undef CHK_NEQ
 336
 337         return 0;
 338 }
 339
 340 static void _iwl_set_rxon_ht(struct iwl_priv *priv,
 341                              struct iwl_ht_config *ht_conf,
 342                              struct iwl_rxon_context *ctx)
 343 {
 344         struct iwl_rxon_cmd *rxon = &ctx->staging;
 345
 346         if (!ctx->ht.enabled) {
 347                 rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
 348                         RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
 349                         RXON_FLG_HT40_PROT_MSK |
 350                         RXON_FLG_HT_PROT_MSK);
 351                 return;
 352         }
 353
 354         /* FIXME: if the definition of ht.protection changed, the "translation"
 355          * will be needed for rxon->flags
 356          */
 357         rxon->flags |= cpu_to_le32(ctx->ht.protection << RXON_FLG_HT_OPERATING_MODE_POS);
 358
 359         /* Set up channel bandwidth:
 360          * 20 MHz only, 20/40 mixed or pure 40 if ht40 ok */
 361         /* clear the HT channel mode before set the mode */
 362         rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
 363                          RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
 364         if (iwl_is_ht40_tx_allowed(priv, ctx, NULL)) {
 365                 /* pure ht40 */
 366                 if (ctx->ht.protection == IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
 367                         rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
 368                         /* Note: control channel is opposite of extension channel */
 369                         switch (ctx->ht.extension_chan_offset) {
 370                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 371                                 rxon->flags &= ~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 372                                 break;
 373                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 374                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 375                                 break;
 376                         }
 377                 } else {
 378                         /* Note: control channel is opposite of extension channel */
 379                         switch (ctx->ht.extension_chan_offset) {
 380                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 381                                 rxon->flags &= ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
 382                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
 383                                 break;
 384                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 385                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 386                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
 387                                 break;
 388                         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
 389                         default:
 390                                 /* channel location only valid if in Mixed mode */
 391                                 IWL_ERR(priv, "invalid extension channel offset\n");
 392                                 break;
 393                         }
 394                 }
 395         } else {
 396                 rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
 397         }
 398
 399         iwlagn_set_rxon_chain(priv, ctx);
 400
 401         IWL_DEBUG_ASSOC(priv, "rxon flags 0x%X operation mode :0x%X "
 402                         "extension channel offset 0x%x\n",
 403                         le32_to_cpu(rxon->flags), ctx->ht.protection,
 404                         ctx->ht.extension_chan_offset);
 405 }
 406
 407 void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_config *ht_conf)
 408 {
 409         struct iwl_rxon_context *ctx;
 410
 411         for_each_context(priv, ctx)
 412                 _iwl_set_rxon_ht(priv, ht_conf, ctx);
 413 }
 414
 415 /* Return valid, unused, channel for a passive scan to reset the RF */
 416 u8 iwl_get_single_channel_number(struct iwl_priv *priv,
 417                                  enum ieee80211_band band)
 418 {
 419         const struct iwl_channel_info *ch_info;
 420         int i;
 421         u8 channel = 0;
 422         u8 min, max;
 423         struct iwl_rxon_context *ctx;
 424
 425         if (band == IEEE80211_BAND_5GHZ) {
 426                 min = 14;
 427                 max = priv->channel_count;
 428         } else {
 429                 min = 0;
 430                 max = 14;
 431         }
 432
 433         for (i = min; i < max; i++) {
 434                 bool busy = false;
 435
 436                 for_each_context(priv, ctx) {
 437                         busy = priv->channel_info[i].channel ==
 438                                 le16_to_cpu(ctx->staging.channel);
 439                         if (busy)
 440                                 break;
 441                 }
 442
 443                 if (busy)
 444                         continue;
 445
 446                 channel = priv->channel_info[i].channel;
 447                 ch_info = iwl_get_channel_info(priv, band, channel);
 448                 if (is_channel_valid(ch_info))
 449                         break;
 450         }
 451
 452         return channel;
 453 }
 454
 455 /**
 456  * iwl_set_rxon_channel - Set the band and channel values in staging RXON
 457  * @ch: requested channel as a pointer to struct ieee80211_channel
 458
 459  * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
 460  * in the staging RXON flag structure based on the ch->band
 461  */
 462 void iwl_set_rxon_channel(struct iwl_priv *priv, struct ieee80211_channel *ch,
 463                          struct iwl_rxon_context *ctx)
 464 {
 465         enum ieee80211_band band = ch->band;
 466         u16 channel = ch->hw_value;
 467
 468         if ((le16_to_cpu(ctx->staging.channel) == channel) &&
 469             (priv->band == band))
 470                 return;
 471
 472         ctx->staging.channel = cpu_to_le16(channel);
 473         if (band == IEEE80211_BAND_5GHZ)
 474                 ctx->staging.flags &= ~RXON_FLG_BAND_24G_MSK;
 475         else
 476                 ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
 477
 478         priv->band = band;
 479
 480         IWL_DEBUG_INFO(priv, "Staging channel set to %d [%d]\n", channel, band);
 481
 482 }
 483
 484 void iwl_set_flags_for_band(struct iwl_priv *priv,
 485                             struct iwl_rxon_context *ctx,
 486                             enum ieee80211_band band,
 487                             struct ieee80211_vif *vif)
 488 {
 489         if (band == IEEE80211_BAND_5GHZ) {
 490                 ctx->staging.flags &=
 491                     ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK
 492                       | RXON_FLG_CCK_MSK);
 493                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 494         } else {
 495                 /* Copied from iwl_post_associate() */
 496                 if (vif && vif->bss_conf.use_short_slot)
 497                         ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 498                 else
 499                         ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 500
 501                 ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
 502                 ctx->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
 503                 ctx->staging.flags &= ~RXON_FLG_CCK_MSK;
 504         }
 505 }
 506
 507 /*
 508  * initialize rxon structure with default values from eeprom
 509  */
 510 void iwl_connection_init_rx_config(struct iwl_priv *priv,
 511                                    struct iwl_rxon_context *ctx)
 512 {
 513         const struct iwl_channel_info *ch_info;
 514
 515         memset(&ctx->staging, 0, sizeof(ctx->staging));
 516
 517         if (!ctx->vif) {
 518                 ctx->staging.dev_type = ctx->unused_devtype;
 519         } else switch (ctx->vif->type) {
 520         case NL80211_IFTYPE_AP:
 521                 ctx->staging.dev_type = ctx->ap_devtype;
 522                 break;
 523
 524         case NL80211_IFTYPE_STATION:
 525                 ctx->staging.dev_type = ctx->station_devtype;
 526                 ctx->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
 527                 break;
 528
 529         case NL80211_IFTYPE_ADHOC:
 530                 ctx->staging.dev_type = ctx->ibss_devtype;
 531                 ctx->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
 532                 ctx->staging.filter_flags = RXON_FILTER_BCON_AWARE_MSK |
 533                                                   RXON_FILTER_ACCEPT_GRP_MSK;
 534                 break;
 535
 536         default:
 537                 IWL_ERR(priv, "Unsupported interface type %d\n",
 538                         ctx->vif->type);
 539                 break;
 540         }
 541
 542 #if 0
 543         /* TODO:  Figure out when short_preamble would be set and cache from
 544          * that */
 545         if (!hw_to_local(priv->hw)->short_preamble)
 546                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 547         else
 548                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 549 #endif
 550
 551         ch_info = iwl_get_channel_info(priv, priv->band,
 552                                        le16_to_cpu(ctx->active.channel));
 553
 554         if (!ch_info)
 555                 ch_info = &priv->channel_info[0];
 556
 557         ctx->staging.channel = cpu_to_le16(ch_info->channel);
 558         priv->band = ch_info->band;
 559
 560         iwl_set_flags_for_band(priv, ctx, priv->band, ctx->vif);
 561
 562         ctx->staging.ofdm_basic_rates =
 563             (IWL_OFDM_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
 564         ctx->staging.cck_basic_rates =
 565             (IWL_CCK_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;
 566
 567         /* clear both MIX and PURE40 mode flag */
 568         ctx->staging.flags &= ~(RXON_FLG_CHANNEL_MODE_MIXED |
 569                                         RXON_FLG_CHANNEL_MODE_PURE_40);
 570         if (ctx->vif)
 571                 memcpy(ctx->staging.node_addr, ctx->vif->addr, ETH_ALEN);
 572
 573         ctx->staging.ofdm_ht_single_stream_basic_rates = 0xff;
 574         ctx->staging.ofdm_ht_dual_stream_basic_rates = 0xff;
 575         ctx->staging.ofdm_ht_triple_stream_basic_rates = 0xff;
 576 }
 577
 578 void iwl_set_rate(struct iwl_priv *priv)
 579 {
 580         const struct ieee80211_supported_band *hw = NULL;
 581         struct ieee80211_rate *rate;
 582         struct iwl_rxon_context *ctx;
 583         int i;
 584
 585         hw = iwl_get_hw_mode(priv, priv->band);
 586         if (!hw) {
 587                 IWL_ERR(priv, "Failed to set rate: unable to get hw mode\n");
 588                 return;
 589         }
 590
 591         priv->active_rate = 0;
 592
 593         for (i = 0; i < hw->n_bitrates; i++) {
 594                 rate = &(hw->bitrates[i]);
 595                 if (rate->hw_value < IWL_RATE_COUNT_LEGACY)
 596                         priv->active_rate |= (1 << rate->hw_value);
 597         }
 598
 599         IWL_DEBUG_RATE(priv, "Set active_rate = %0x\n", priv->active_rate);
 600
 601         for_each_context(priv, ctx) {
 602                 ctx->staging.cck_basic_rates =
 603                     (IWL_CCK_BASIC_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;
 604
 605                 ctx->staging.ofdm_basic_rates =
 606                    (IWL_OFDM_BASIC_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
 607         }
 608 }
 609
 610 void iwl_chswitch_done(struct iwl_priv *priv, bool is_success)
 611 {
 612         /*
 613          * MULTI-FIXME
 614          * See iwlagn_mac_channel_switch.
 615          */
 616         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 617
 618         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 619                 return;
 620
 621         if (test_and_clear_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status))
 622                 ieee80211_chswitch_done(ctx->vif, is_success);
 623 }
 624
 625 #ifdef CONFIG_IWLWIFI_DEBUG
 626 void iwl_print_rx_config_cmd(struct iwl_priv *priv,
 627                              enum iwl_rxon_context_id ctxid)
 628 {
 629         struct iwl_rxon_context *ctx = &priv->contexts[ctxid];
 630         struct iwl_rxon_cmd *rxon = &ctx->staging;
 631
 632         IWL_DEBUG_RADIO(priv, "RX CONFIG:\n");
 633         iwl_print_hex_dump(priv, IWL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
 634         IWL_DEBUG_RADIO(priv, "u16 channel: 0x%x\n", le16_to_cpu(rxon->channel));
 635         IWL_DEBUG_RADIO(priv, "u32 flags: 0x%08X\n", le32_to_cpu(rxon->flags));
 636         IWL_DEBUG_RADIO(priv, "u32 filter_flags: 0x%08x\n",
 637                         le32_to_cpu(rxon->filter_flags));
 638         IWL_DEBUG_RADIO(priv, "u8 dev_type: 0x%x\n", rxon->dev_type);
 639         IWL_DEBUG_RADIO(priv, "u8 ofdm_basic_rates: 0x%02x\n",
 640                         rxon->ofdm_basic_rates);
 641         IWL_DEBUG_RADIO(priv, "u8 cck_basic_rates: 0x%02x\n", rxon->cck_basic_rates);
 642         IWL_DEBUG_RADIO(priv, "u8[6] node_addr: %pM\n", rxon->node_addr);
 643         IWL_DEBUG_RADIO(priv, "u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
 644         IWL_DEBUG_RADIO(priv, "u16 assoc_id: 0x%x\n", le16_to_cpu(rxon->assoc_id));
 645 }
 646 #endif
 647
 648 void iwlagn_fw_error(struct iwl_priv *priv, bool ondemand)
 649 {
 650         unsigned int reload_msec;
 651         unsigned long reload_jiffies;
 652
 653 #ifdef CONFIG_IWLWIFI_DEBUG
 654         if (iwl_have_debug_level(IWL_DL_FW_ERRORS))
 655                 iwl_print_rx_config_cmd(priv, IWL_RXON_CTX_BSS);
 656 #endif
 657
 658         /* uCode is no longer loaded. */
 659         priv->ucode_loaded = false;
 660
 661         /* Set the FW error flag -- cleared on iwl_down */
 662         set_bit(STATUS_FW_ERROR, &priv->shrd->status);
 663
 664         /* Cancel currently queued command. */
 665         clear_bit(STATUS_HCMD_ACTIVE, &priv->shrd->status);
 666
 667         iwl_abort_notification_waits(&priv->notif_wait);
 668
 669         /* Keep the restart process from trying to send host
 670          * commands by clearing the ready bit */
 671         clear_bit(STATUS_READY, &priv->status);
 672
 673         wake_up(&trans(priv)->wait_command_queue);
 674
 675         if (!ondemand) {
 676                 /*
 677                  * If firmware keep reloading, then it indicate something
 678                  * serious wrong and firmware having problem to recover
 679                  * from it. Instead of keep trying which will fill the syslog
 680                  * and hang the system, let's just stop it
 681                  */
 682                 reload_jiffies = jiffies;
 683                 reload_msec = jiffies_to_msecs((long) reload_jiffies -
 684                                         (long) priv->reload_jiffies);
 685                 priv->reload_jiffies = reload_jiffies;
 686                 if (reload_msec <= IWL_MIN_RELOAD_DURATION) {
 687                         priv->reload_count++;
 688                         if (priv->reload_count >= IWL_MAX_CONTINUE_RELOAD_CNT) {
 689                                 IWL_ERR(priv, "BUG_ON, Stop restarting\n");
 690                                 return;
 691                         }
 692                 } else
 693                         priv->reload_count = 0;
 694         }
 695
 696         if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 697                 if (iwlagn_mod_params.restart_fw) {
 698                         IWL_DEBUG_FW_ERRORS(priv,
 699                                   "Restarting adapter due to uCode error.\n");
 700                         queue_work(priv->workqueue, &priv->restart);
 701                 } else
 702                         IWL_DEBUG_FW_ERRORS(priv,
 703                                   "Detected FW error, but not restarting\n");
 704         }
 705 }
 706
 707 int iwl_set_tx_power(struct iwl_priv *priv, s8 tx_power, bool force)
 708 {
 709         int ret;
 710         s8 prev_tx_power;
 711         bool defer;
 712         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 713
 714         lockdep_assert_held(&priv->mutex);
 715
 716         if (priv->tx_power_user_lmt == tx_power && !force)
 717                 return 0;
 718
 719         if (tx_power < IWLAGN_TX_POWER_TARGET_POWER_MIN) {
 720                 IWL_WARN(priv,
 721                          "Requested user TXPOWER %d below lower limit %d.\n",
 722                          tx_power,
 723                          IWLAGN_TX_POWER_TARGET_POWER_MIN);
 724                 return -EINVAL;
 725         }
 726
 727         if (tx_power > priv->tx_power_device_lmt) {
 728                 IWL_WARN(priv,
 729                         "Requested user TXPOWER %d above upper limit %d.\n",
 730                          tx_power, priv->tx_power_device_lmt);
 731                 return -EINVAL;
 732         }
 733
 734         if (!iwl_is_ready_rf(priv))
 735                 return -EIO;
 736
 737         /* scan complete and commit_rxon use tx_power_next value,
 738          * it always need to be updated for newest request */
 739         priv->tx_power_next = tx_power;
 740
 741         /* do not set tx power when scanning or channel changing */
 742         defer = test_bit(STATUS_SCANNING, &priv->status) ||
 743                 memcmp(&ctx->active, &ctx->staging, sizeof(ctx->staging));
 744         if (defer && !force) {
 745                 IWL_DEBUG_INFO(priv, "Deferring tx power set\n");
 746                 return 0;
 747         }
 748
 749         prev_tx_power = priv->tx_power_user_lmt;
 750         priv->tx_power_user_lmt = tx_power;
 751
 752         ret = iwlagn_send_tx_power(priv);
 753
 754         /* if fail to set tx_power, restore the orig. tx power */
 755         if (ret) {
 756                 priv->tx_power_user_lmt = prev_tx_power;
 757                 priv->tx_power_next = prev_tx_power;
 758         }
 759         return ret;
 760 }
 761
 762 void iwl_send_bt_config(struct iwl_priv *priv)
 763 {
 764         struct iwl_bt_cmd bt_cmd = {
 765                 .lead_time = BT_LEAD_TIME_DEF,
 766                 .max_kill = BT_MAX_KILL_DEF,
 767                 .kill_ack_mask = 0,
 768                 .kill_cts_mask = 0,
 769         };
 770
 771         if (!iwlagn_mod_params.bt_coex_active)
 772                 bt_cmd.flags = BT_COEX_DISABLE;
 773         else
 774                 bt_cmd.flags = BT_COEX_ENABLE;
 775
 776         priv->bt_enable_flag = bt_cmd.flags;
 777         IWL_DEBUG_INFO(priv, "BT coex %s\n",
 778                 (bt_cmd.flags == BT_COEX_DISABLE) ? "disable" : "active");
 779
 780         if (iwl_dvm_send_cmd_pdu(priv, REPLY_BT_CONFIG,
 781                              CMD_SYNC, sizeof(struct iwl_bt_cmd), &bt_cmd))
 782                 IWL_ERR(priv, "failed to send BT Coex Config\n");
 783 }
 784
 785 int iwl_send_statistics_request(struct iwl_priv *priv, u8 flags, bool clear)
 786 {
 787         struct iwl_statistics_cmd statistics_cmd = {
 788                 .configuration_flags =
 789                         clear ? IWL_STATS_CONF_CLEAR_STATS : 0,
 790         };
 791
 792         if (flags & CMD_ASYNC)
 793                 return iwl_dvm_send_cmd_pdu(priv, REPLY_STATISTICS_CMD,
 794                                               CMD_ASYNC,
 795                                                sizeof(struct iwl_statistics_cmd),
 796                                                &statistics_cmd);
 797         else
 798                 return iwl_dvm_send_cmd_pdu(priv, REPLY_STATISTICS_CMD,
 799                                         CMD_SYNC,
 800                                         sizeof(struct iwl_statistics_cmd),
 801                                         &statistics_cmd);
 802 }
 803
 804
 805
 806
 807 #ifdef CONFIG_IWLWIFI_DEBUGFS
 808
 809 #define IWL_TRAFFIC_DUMP_SIZE   (IWL_TRAFFIC_ENTRY_SIZE * IWL_TRAFFIC_ENTRIES)
 810
 811 void iwl_reset_traffic_log(struct iwl_priv *priv)
 812 {
 813         priv->tx_traffic_idx = 0;
 814         priv->rx_traffic_idx = 0;
 815         if (priv->tx_traffic)
 816                 memset(priv->tx_traffic, 0, IWL_TRAFFIC_DUMP_SIZE);
 817         if (priv->rx_traffic)
 818                 memset(priv->rx_traffic, 0, IWL_TRAFFIC_DUMP_SIZE);
 819 }
 820
 821 int iwl_alloc_traffic_mem(struct iwl_priv *priv)
 822 {
 823         u32 traffic_size = IWL_TRAFFIC_DUMP_SIZE;
 824
 825         if (iwl_have_debug_level(IWL_DL_TX)) {
 826                 if (!priv->tx_traffic) {
 827                         priv->tx_traffic =
 828                                 kzalloc(traffic_size, GFP_KERNEL);
 829                         if (!priv->tx_traffic)
 830                                 return -ENOMEM;
 831                 }
 832         }
 833         if (iwl_have_debug_level(IWL_DL_RX)) {
 834                 if (!priv->rx_traffic) {
 835                         priv->rx_traffic =
 836                                 kzalloc(traffic_size, GFP_KERNEL);
 837                         if (!priv->rx_traffic)
 838                                 return -ENOMEM;
 839                 }
 840         }
 841         iwl_reset_traffic_log(priv);
 842         return 0;
 843 }
 844
 845 void iwl_free_traffic_mem(struct iwl_priv *priv)
 846 {
 847         kfree(priv->tx_traffic);
 848         priv->tx_traffic = NULL;
 849
 850         kfree(priv->rx_traffic);
 851         priv->rx_traffic = NULL;
 852 }
 853
 854 void iwl_dbg_log_tx_data_frame(struct iwl_priv *priv,
 855                       u16 length, struct ieee80211_hdr *header)
 856 {
 857         __le16 fc;
 858         u16 len;
 859
 860         if (likely(!iwl_have_debug_level(IWL_DL_TX)))
 861                 return;
 862
 863         if (!priv->tx_traffic)
 864                 return;
 865
 866         fc = header->frame_control;
 867         if (ieee80211_is_data(fc)) {
 868                 len = (length > IWL_TRAFFIC_ENTRY_SIZE)
 869                        ? IWL_TRAFFIC_ENTRY_SIZE : length;
 870                 memcpy((priv->tx_traffic +
 871                        (priv->tx_traffic_idx * IWL_TRAFFIC_ENTRY_SIZE)),
 872                        header, len);
 873                 priv->tx_traffic_idx =
 874                         (priv->tx_traffic_idx + 1) % IWL_TRAFFIC_ENTRIES;
 875         }
 876 }
 877
 878 void iwl_dbg_log_rx_data_frame(struct iwl_priv *priv,
 879                       u16 length, struct ieee80211_hdr *header)
 880 {
 881         __le16 fc;
 882         u16 len;
 883
 884         if (likely(!iwl_have_debug_level(IWL_DL_RX)))
 885                 return;
 886
 887         if (!priv->rx_traffic)
 888                 return;
 889
 890         fc = header->frame_control;
 891         if (ieee80211_is_data(fc)) {
 892                 len = (length > IWL_TRAFFIC_ENTRY_SIZE)
 893                        ? IWL_TRAFFIC_ENTRY_SIZE : length;
 894                 memcpy((priv->rx_traffic +
 895                        (priv->rx_traffic_idx * IWL_TRAFFIC_ENTRY_SIZE)),
 896                        header, len);
 897                 priv->rx_traffic_idx =
 898                         (priv->rx_traffic_idx + 1) % IWL_TRAFFIC_ENTRIES;
 899         }
 900 }
 901
 902 const char *get_mgmt_string(int cmd)
 903 {
 904         switch (cmd) {
 905                 IWL_CMD(MANAGEMENT_ASSOC_REQ);
 906                 IWL_CMD(MANAGEMENT_ASSOC_RESP);
 907                 IWL_CMD(MANAGEMENT_REASSOC_REQ);
 908                 IWL_CMD(MANAGEMENT_REASSOC_RESP);
 909                 IWL_CMD(MANAGEMENT_PROBE_REQ);
 910                 IWL_CMD(MANAGEMENT_PROBE_RESP);
 911                 IWL_CMD(MANAGEMENT_BEACON);
 912                 IWL_CMD(MANAGEMENT_ATIM);
 913                 IWL_CMD(MANAGEMENT_DISASSOC);
 914                 IWL_CMD(MANAGEMENT_AUTH);
 915                 IWL_CMD(MANAGEMENT_DEAUTH);
 916                 IWL_CMD(MANAGEMENT_ACTION);
 917         default:
 918                 return "UNKNOWN";
 919
 920         }
 921 }
 922
 923 const char *get_ctrl_string(int cmd)
 924 {
 925         switch (cmd) {
 926                 IWL_CMD(CONTROL_BACK_REQ);
 927                 IWL_CMD(CONTROL_BACK);
 928                 IWL_CMD(CONTROL_PSPOLL);
 929                 IWL_CMD(CONTROL_RTS);
 930                 IWL_CMD(CONTROL_CTS);
 931                 IWL_CMD(CONTROL_ACK);
 932                 IWL_CMD(CONTROL_CFEND);
 933                 IWL_CMD(CONTROL_CFENDACK);
 934         default:
 935                 return "UNKNOWN";
 936
 937         }
 938 }
 939
 940 void iwl_clear_traffic_stats(struct iwl_priv *priv)
 941 {
 942         memset(&priv->tx_stats, 0, sizeof(struct traffic_stats));
 943         memset(&priv->rx_stats, 0, sizeof(struct traffic_stats));
 944 }
 945
 946 /*
 947  * if CONFIG_IWLWIFI_DEBUGFS defined, iwl_update_stats function will
 948  * record all the MGMT, CTRL and DATA pkt for both TX and Rx pass.
 949  * Use debugFs to display the rx/rx_statistics
 950  * if CONFIG_IWLWIFI_DEBUGFS not being defined, then no MGMT and CTRL
 951  * information will be recorded, but DATA pkt still will be recorded
 952  * for the reason of iwl_led.c need to control the led blinking based on
 953  * number of tx and rx data.
 954  *
 955  */
 956 void iwl_update_stats(struct iwl_priv *priv, bool is_tx, __le16 fc, u16 len)
 957 {
 958         struct traffic_stats    *stats;
 959
 960         if (is_tx)
 961                 stats = &priv->tx_stats;
 962         else
 963                 stats = &priv->rx_stats;
 964
 965         if (ieee80211_is_mgmt(fc)) {
 966                 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
 967                 case cpu_to_le16(IEEE80211_STYPE_ASSOC_REQ):
 968                         stats->mgmt[MANAGEMENT_ASSOC_REQ]++;
 969                         break;
 970                 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
 971                         stats->mgmt[MANAGEMENT_ASSOC_RESP]++;
 972                         break;
 973                 case cpu_to_le16(IEEE80211_STYPE_REASSOC_REQ):
 974                         stats->mgmt[MANAGEMENT_REASSOC_REQ]++;
 975                         break;
 976                 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
 977                         stats->mgmt[MANAGEMENT_REASSOC_RESP]++;
 978                         break;
 979                 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
 980                         stats->mgmt[MANAGEMENT_PROBE_REQ]++;
 981                         break;
 982                 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
 983                         stats->mgmt[MANAGEMENT_PROBE_RESP]++;
 984                         break;
 985                 case cpu_to_le16(IEEE80211_STYPE_BEACON):
 986                         stats->mgmt[MANAGEMENT_BEACON]++;
 987                         break;
 988                 case cpu_to_le16(IEEE80211_STYPE_ATIM):
 989                         stats->mgmt[MANAGEMENT_ATIM]++;
 990                         break;
 991                 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
 992                         stats->mgmt[MANAGEMENT_DISASSOC]++;
 993                         break;
 994                 case cpu_to_le16(IEEE80211_STYPE_AUTH):
 995                         stats->mgmt[MANAGEMENT_AUTH]++;
 996                         break;
 997                 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
 998                         stats->mgmt[MANAGEMENT_DEAUTH]++;
 999                         break;
1000                 case cpu_to_le16(IEEE80211_STYPE_ACTION):
1001                         stats->mgmt[MANAGEMENT_ACTION]++;
1002                         break;
1003                 }
1004         } else if (ieee80211_is_ctl(fc)) {
1005                 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
1006                 case cpu_to_le16(IEEE80211_STYPE_BACK_REQ):
1007                         stats->ctrl[CONTROL_BACK_REQ]++;
1008                         break;
1009                 case cpu_to_le16(IEEE80211_STYPE_BACK):
1010                         stats->ctrl[CONTROL_BACK]++;
1011                         break;
1012                 case cpu_to_le16(IEEE80211_STYPE_PSPOLL):
1013                         stats->ctrl[CONTROL_PSPOLL]++;
1014                         break;
1015                 case cpu_to_le16(IEEE80211_STYPE_RTS):
1016                         stats->ctrl[CONTROL_RTS]++;
1017                         break;
1018                 case cpu_to_le16(IEEE80211_STYPE_CTS):
1019                         stats->ctrl[CONTROL_CTS]++;
1020                         break;
1021                 case cpu_to_le16(IEEE80211_STYPE_ACK):
1022                         stats->ctrl[CONTROL_ACK]++;
1023                         break;
1024                 case cpu_to_le16(IEEE80211_STYPE_CFEND):
1025                         stats->ctrl[CONTROL_CFEND]++;
1026                         break;
1027                 case cpu_to_le16(IEEE80211_STYPE_CFENDACK):
1028                         stats->ctrl[CONTROL_CFENDACK]++;
1029                         break;
1030                 }
1031         } else {
1032                 /* data */
1033                 stats->data_cnt++;
1034                 stats->data_bytes += len;
1035         }
1036 }
1037 #endif
1038
1039 static void iwl_force_rf_reset(struct iwl_priv *priv)
1040 {
1041         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
1042                 return;
1043
1044         if (!iwl_is_any_associated(priv)) {
1045                 IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n");
1046                 return;
1047         }
1048         /*
1049          * There is no easy and better way to force reset the radio,
1050          * the only known method is switching channel which will force to
1051          * reset and tune the radio.
1052          * Use internal short scan (single channel) operation to should
1053          * achieve this objective.
1054          * Driver should reset the radio when number of consecutive missed
1055          * beacon, or any other uCode error condition detected.
1056          */
1057         IWL_DEBUG_INFO(priv, "perform radio reset.\n");
1058         iwl_internal_short_hw_scan(priv);
1059 }
1060
1061
1062 int iwl_force_reset(struct iwl_priv *priv, int mode, bool external)
1063 {
1064         struct iwl_force_reset *force_reset;
1065
1066         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
1067                 return -EINVAL;
1068
1069         if (mode >= IWL_MAX_FORCE_RESET) {
1070                 IWL_DEBUG_INFO(priv, "invalid reset request.\n");
1071                 return -EINVAL;
1072         }
1073         force_reset = &priv->force_reset[mode];
1074         force_reset->reset_request_count++;
1075         if (!external) {
1076                 if (force_reset->last_force_reset_jiffies &&
1077                     time_after(force_reset->last_force_reset_jiffies +
1078                     force_reset->reset_duration, jiffies)) {
1079                         IWL_DEBUG_INFO(priv, "force reset rejected\n");
1080                         force_reset->reset_reject_count++;
1081                         return -EAGAIN;
1082                 }
1083         }
1084         force_reset->reset_success_count++;
1085         force_reset->last_force_reset_jiffies = jiffies;
1086         IWL_DEBUG_INFO(priv, "perform force reset (%d)\n", mode);
1087         switch (mode) {
1088         case IWL_RF_RESET:
1089                 iwl_force_rf_reset(priv);
1090                 break;
1091         case IWL_FW_RESET:
1092                 /*
1093                  * if the request is from external(ex: debugfs),
1094                  * then always perform the request in regardless the module
1095                  * parameter setting
1096                  * if the request is from internal (uCode error or driver
1097                  * detect failure), then fw_restart module parameter
1098                  * need to be check before performing firmware reload
1099                  */
1100                 if (!external && !iwlagn_mod_params.restart_fw) {
1101                         IWL_DEBUG_INFO(priv, "Cancel firmware reload based on "
1102                                        "module parameter setting\n");
1103                         break;
1104                 }
1105                 IWL_ERR(priv, "On demand firmware reload\n");
1106                 iwlagn_fw_error(priv, true);
1107                 break;
1108         }
1109         return 0;
1110 }
1111
1112
1113 int iwl_cmd_echo_test(struct iwl_priv *priv)
1114 {
1115         int ret;
1116         struct iwl_host_cmd cmd = {
1117                 .id = REPLY_ECHO,
1118                 .len = { 0 },
1119                 .flags = CMD_SYNC,
1120         };
1121
1122         ret = iwl_dvm_send_cmd(priv, &cmd);
1123         if (ret)
1124                 IWL_ERR(priv, "echo testing fail: 0X%x\n", ret);
1125         else
1126                 IWL_DEBUG_INFO(priv, "echo testing pass\n");
1127         return ret;
1128 }
1129
1130 static inline int iwl_check_stuck_queue(struct iwl_priv *priv, int txq)
1131 {
1132         if (iwl_trans_check_stuck_queue(trans(priv), txq)) {
1133                 int ret;
1134                 ret = iwl_force_reset(priv, IWL_FW_RESET, false);
1135                 return (ret == -EAGAIN) ? 0 : 1;
1136         }
1137         return 0;
1138 }
1139
1140 /*
1141  * Making watchdog tick be a quarter of timeout assure we will
1142  * discover the queue hung between timeout and 1.25*timeout
1143  */
1144 #define IWL_WD_TICK(timeout) ((timeout) / 4)
1145
1146 /*
1147  * Watchdog timer callback, we check each tx queue for stuck, if if hung
1148  * we reset the firmware. If everything is fine just rearm the timer.
1149  */
1150 void iwl_bg_watchdog(unsigned long data)
1151 {
1152         struct iwl_priv *priv = (struct iwl_priv *)data;
1153         int cnt;
1154         unsigned long timeout;
1155
1156         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
1157                 return;
1158
1159         if (iwl_is_rfkill(priv))
1160                 return;
1161
1162         timeout = hw_params(priv).wd_timeout;
1163         if (timeout == 0)
1164                 return;
1165
1166         /* monitor and check for stuck queues */
1167         for (cnt = 0; cnt < cfg(priv)->base_params->num_of_queues; cnt++)
1168                 if (iwl_check_stuck_queue(priv, cnt))
1169                         return;
1170
1171         mod_timer(&priv->watchdog, jiffies +
1172                   msecs_to_jiffies(IWL_WD_TICK(timeout)));
1173 }
1174
1175 void iwl_setup_watchdog(struct iwl_priv *priv)
1176 {
1177         unsigned int timeout = hw_params(priv).wd_timeout;
1178
1179         if (!iwlagn_mod_params.wd_disable) {
1180                 /* use system default */
1181                 if (timeout && !cfg(priv)->base_params->wd_disable)
1182                         mod_timer(&priv->watchdog,
1183                                 jiffies +
1184                                 msecs_to_jiffies(IWL_WD_TICK(timeout)));
1185                 else
1186                         del_timer(&priv->watchdog);
1187         } else {
1188                 /* module parameter overwrite default configuration */
1189                 if (timeout && iwlagn_mod_params.wd_disable == 2)
1190                         mod_timer(&priv->watchdog,
1191                                 jiffies +
1192                                 msecs_to_jiffies(IWL_WD_TICK(timeout)));
1193                 else
1194                         del_timer(&priv->watchdog);
1195         }
1196 }
1197
1198 /**
1199  * iwl_beacon_time_mask_low - mask of lower 32 bit of beacon time
1200  * @priv -- pointer to iwl_priv data structure
1201  * @tsf_bits -- number of bits need to shift for masking)
1202  */
1203 static inline u32 iwl_beacon_time_mask_low(struct iwl_priv *priv,
1204                                            u16 tsf_bits)
1205 {
1206         return (1 << tsf_bits) - 1;
1207 }
1208
1209 /**
1210  * iwl_beacon_time_mask_high - mask of higher 32 bit of beacon time
1211  * @priv -- pointer to iwl_priv data structure
1212  * @tsf_bits -- number of bits need to shift for masking)
1213  */
1214 static inline u32 iwl_beacon_time_mask_high(struct iwl_priv *priv,
1215                                             u16 tsf_bits)
1216 {
1217         return ((1 << (32 - tsf_bits)) - 1) << tsf_bits;
1218 }
1219
1220 /*
1221  * extended beacon time format
1222  * time in usec will be changed into a 32-bit value in extended:internal format
1223  * the extended part is the beacon counts
1224  * the internal part is the time in usec within one beacon interval
1225  */
1226 u32 iwl_usecs_to_beacons(struct iwl_priv *priv, u32 usec, u32 beacon_interval)
1227 {
1228         u32 quot;
1229         u32 rem;
1230         u32 interval = beacon_interval * TIME_UNIT;
1231
1232         if (!interval || !usec)
1233                 return 0;
1234
1235         quot = (usec / interval) &
1236                 (iwl_beacon_time_mask_high(priv, IWLAGN_EXT_BEACON_TIME_POS) >>
1237                 IWLAGN_EXT_BEACON_TIME_POS);
1238         rem = (usec % interval) & iwl_beacon_time_mask_low(priv,
1239                                    IWLAGN_EXT_BEACON_TIME_POS);
1240
1241         return (quot << IWLAGN_EXT_BEACON_TIME_POS) + rem;
1242 }
1243
1244 /* base is usually what we get from ucode with each received frame,
1245  * the same as HW timer counter counting down
1246  */
1247 __le32 iwl_add_beacon_time(struct iwl_priv *priv, u32 base,
1248                            u32 addon, u32 beacon_interval)
1249 {
1250         u32 base_low = base & iwl_beacon_time_mask_low(priv,
1251                                 IWLAGN_EXT_BEACON_TIME_POS);
1252         u32 addon_low = addon & iwl_beacon_time_mask_low(priv,
1253                                 IWLAGN_EXT_BEACON_TIME_POS);
1254         u32 interval = beacon_interval * TIME_UNIT;
1255         u32 res = (base & iwl_beacon_time_mask_high(priv,
1256                                 IWLAGN_EXT_BEACON_TIME_POS)) +
1257                                 (addon & iwl_beacon_time_mask_high(priv,
1258                                 IWLAGN_EXT_BEACON_TIME_POS));
1259
1260         if (base_low > addon_low)
1261                 res += base_low - addon_low;
1262         else if (base_low < addon_low) {
1263                 res += interval + base_low - addon_low;
1264                 res += (1 << IWLAGN_EXT_BEACON_TIME_POS);
1265         } else
1266                 res += (1 << IWLAGN_EXT_BEACON_TIME_POS);
1267
1268         return cpu_to_le32(res);
1269 }
1270
1271 void iwl_set_hw_rfkill_state(struct iwl_op_mode *op_mode, bool state)
1272 {
1273         struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
1274
1275         if (state)
1276                 set_bit(STATUS_RF_KILL_HW, &priv->status);
1277         else
1278                 clear_bit(STATUS_RF_KILL_HW, &priv->status);
1279
1280         wiphy_rfkill_set_hw_state(priv->hw->wiphy, state);
1281 }
1282
1283 void iwl_free_skb(struct iwl_op_mode *op_mode, struct sk_buff *skb)
1284 {
1285         struct ieee80211_tx_info *info;
1286
1287         info = IEEE80211_SKB_CB(skb);
1288         kmem_cache_free(iwl_tx_cmd_pool, (info->driver_data[1]));
1289         dev_kfree_skb_any(skb);
1290 }