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 /**
  92  * iwl_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
  93  * @priv: staging_rxon is compared to active_rxon
  94  *
  95  * If the RXON structure is changing enough to require a new tune,
  96  * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
  97  * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
  98  */
  99 int iwl_full_rxon_required(struct iwl_priv *priv,
 100                            struct iwl_rxon_context *ctx)
 101 {
 102         const struct iwl_rxon_cmd *staging = &ctx->staging;
 103         const struct iwl_rxon_cmd *active = &ctx->active;
 104
 105 #define CHK(cond)                                                       \
 106         if ((cond)) {                                                   \
 107                 IWL_DEBUG_INFO(priv, "need full RXON - " #cond "\n");   \
 108                 return 1;                                               \
 109         }
 110
 111 #define CHK_NEQ(c1, c2)                                         \
 112         if ((c1) != (c2)) {                                     \
 113                 IWL_DEBUG_INFO(priv, "need full RXON - "        \
 114                                #c1 " != " #c2 " - %d != %d\n",  \
 115                                (c1), (c2));                     \
 116                 return 1;                                       \
 117         }
 118
 119         /* These items are only settable from the full RXON command */
 120         CHK(!iwl_is_associated_ctx(ctx));
 121         CHK(compare_ether_addr(staging->bssid_addr, active->bssid_addr));
 122         CHK(compare_ether_addr(staging->node_addr, active->node_addr));
 123         CHK(compare_ether_addr(staging->wlap_bssid_addr,
 124                                 active->wlap_bssid_addr));
 125         CHK_NEQ(staging->dev_type, active->dev_type);
 126         CHK_NEQ(staging->channel, active->channel);
 127         CHK_NEQ(staging->air_propagation, active->air_propagation);
 128         CHK_NEQ(staging->ofdm_ht_single_stream_basic_rates,
 129                 active->ofdm_ht_single_stream_basic_rates);
 130         CHK_NEQ(staging->ofdm_ht_dual_stream_basic_rates,
 131                 active->ofdm_ht_dual_stream_basic_rates);
 132         CHK_NEQ(staging->ofdm_ht_triple_stream_basic_rates,
 133                 active->ofdm_ht_triple_stream_basic_rates);
 134         CHK_NEQ(staging->assoc_id, active->assoc_id);
 135
 136         /* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
 137          * be updated with the RXON_ASSOC command -- however only some
 138          * flag transitions are allowed using RXON_ASSOC */
 139
 140         /* Check if we are not switching bands */
 141         CHK_NEQ(staging->flags & RXON_FLG_BAND_24G_MSK,
 142                 active->flags & RXON_FLG_BAND_24G_MSK);
 143
 144         /* Check if we are switching association toggle */
 145         CHK_NEQ(staging->filter_flags & RXON_FILTER_ASSOC_MSK,
 146                 active->filter_flags & RXON_FILTER_ASSOC_MSK);
 147
 148 #undef CHK
 149 #undef CHK_NEQ
 150
 151         return 0;
 152 }
 153
 154 static void _iwl_set_rxon_ht(struct iwl_priv *priv,
 155                              struct iwl_ht_config *ht_conf,
 156                              struct iwl_rxon_context *ctx)
 157 {
 158         struct iwl_rxon_cmd *rxon = &ctx->staging;
 159
 160         if (!ctx->ht.enabled) {
 161                 rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
 162                         RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
 163                         RXON_FLG_HT40_PROT_MSK |
 164                         RXON_FLG_HT_PROT_MSK);
 165                 return;
 166         }
 167
 168         /* FIXME: if the definition of ht.protection changed, the "translation"
 169          * will be needed for rxon->flags
 170          */
 171         rxon->flags |= cpu_to_le32(ctx->ht.protection << RXON_FLG_HT_OPERATING_MODE_POS);
 172
 173         /* Set up channel bandwidth:
 174          * 20 MHz only, 20/40 mixed or pure 40 if ht40 ok */
 175         /* clear the HT channel mode before set the mode */
 176         rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
 177                          RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
 178         if (iwl_is_ht40_tx_allowed(priv, ctx, NULL)) {
 179                 /* pure ht40 */
 180                 if (ctx->ht.protection == IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
 181                         rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
 182                         /* Note: control channel is opposite of extension channel */
 183                         switch (ctx->ht.extension_chan_offset) {
 184                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 185                                 rxon->flags &= ~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 186                                 break;
 187                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 188                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 189                                 break;
 190                         }
 191                 } else {
 192                         /* Note: control channel is opposite of extension channel */
 193                         switch (ctx->ht.extension_chan_offset) {
 194                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 195                                 rxon->flags &= ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
 196                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
 197                                 break;
 198                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 199                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 200                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
 201                                 break;
 202                         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
 203                         default:
 204                                 /* channel location only valid if in Mixed mode */
 205                                 IWL_ERR(priv, "invalid extension channel offset\n");
 206                                 break;
 207                         }
 208                 }
 209         } else {
 210                 rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
 211         }
 212
 213         iwlagn_set_rxon_chain(priv, ctx);
 214
 215         IWL_DEBUG_ASSOC(priv, "rxon flags 0x%X operation mode :0x%X "
 216                         "extension channel offset 0x%x\n",
 217                         le32_to_cpu(rxon->flags), ctx->ht.protection,
 218                         ctx->ht.extension_chan_offset);
 219 }
 220
 221 void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_config *ht_conf)
 222 {
 223         struct iwl_rxon_context *ctx;
 224
 225         for_each_context(priv, ctx)
 226                 _iwl_set_rxon_ht(priv, ht_conf, ctx);
 227 }
 228
 229 /* Return valid, unused, channel for a passive scan to reset the RF */
 230 u8 iwl_get_single_channel_number(struct iwl_priv *priv,
 231                                  enum ieee80211_band band)
 232 {
 233         const struct iwl_channel_info *ch_info;
 234         int i;
 235         u8 channel = 0;
 236         u8 min, max;
 237         struct iwl_rxon_context *ctx;
 238
 239         if (band == IEEE80211_BAND_5GHZ) {
 240                 min = 14;
 241                 max = priv->channel_count;
 242         } else {
 243                 min = 0;
 244                 max = 14;
 245         }
 246
 247         for (i = min; i < max; i++) {
 248                 bool busy = false;
 249
 250                 for_each_context(priv, ctx) {
 251                         busy = priv->channel_info[i].channel ==
 252                                 le16_to_cpu(ctx->staging.channel);
 253                         if (busy)
 254                                 break;
 255                 }
 256
 257                 if (busy)
 258                         continue;
 259
 260                 channel = priv->channel_info[i].channel;
 261                 ch_info = iwl_get_channel_info(priv, band, channel);
 262                 if (is_channel_valid(ch_info))
 263                         break;
 264         }
 265
 266         return channel;
 267 }
 268
 269 /**
 270  * iwl_set_rxon_channel - Set the band and channel values in staging RXON
 271  * @ch: requested channel as a pointer to struct ieee80211_channel
 272
 273  * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
 274  * in the staging RXON flag structure based on the ch->band
 275  */
 276 void iwl_set_rxon_channel(struct iwl_priv *priv, struct ieee80211_channel *ch,
 277                          struct iwl_rxon_context *ctx)
 278 {
 279         enum ieee80211_band band = ch->band;
 280         u16 channel = ch->hw_value;
 281
 282         if ((le16_to_cpu(ctx->staging.channel) == channel) &&
 283             (priv->band == band))
 284                 return;
 285
 286         ctx->staging.channel = cpu_to_le16(channel);
 287         if (band == IEEE80211_BAND_5GHZ)
 288                 ctx->staging.flags &= ~RXON_FLG_BAND_24G_MSK;
 289         else
 290                 ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
 291
 292         priv->band = band;
 293
 294         IWL_DEBUG_INFO(priv, "Staging channel set to %d [%d]\n", channel, band);
 295
 296 }
 297
 298 void iwl_set_flags_for_band(struct iwl_priv *priv,
 299                             struct iwl_rxon_context *ctx,
 300                             enum ieee80211_band band,
 301                             struct ieee80211_vif *vif)
 302 {
 303         if (band == IEEE80211_BAND_5GHZ) {
 304                 ctx->staging.flags &=
 305                     ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK
 306                       | RXON_FLG_CCK_MSK);
 307                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 308         } else {
 309                 /* Copied from iwl_post_associate() */
 310                 if (vif && vif->bss_conf.use_short_slot)
 311                         ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 312                 else
 313                         ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 314
 315                 ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
 316                 ctx->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
 317                 ctx->staging.flags &= ~RXON_FLG_CCK_MSK;
 318         }
 319 }
 320
 321 /*
 322  * initialize rxon structure with default values from eeprom
 323  */
 324 void iwl_connection_init_rx_config(struct iwl_priv *priv,
 325                                    struct iwl_rxon_context *ctx)
 326 {
 327         const struct iwl_channel_info *ch_info;
 328
 329         memset(&ctx->staging, 0, sizeof(ctx->staging));
 330
 331         if (!ctx->vif) {
 332                 ctx->staging.dev_type = ctx->unused_devtype;
 333         } else switch (ctx->vif->type) {
 334         case NL80211_IFTYPE_AP:
 335                 ctx->staging.dev_type = ctx->ap_devtype;
 336                 break;
 337
 338         case NL80211_IFTYPE_STATION:
 339                 ctx->staging.dev_type = ctx->station_devtype;
 340                 ctx->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
 341                 break;
 342
 343         case NL80211_IFTYPE_ADHOC:
 344                 ctx->staging.dev_type = ctx->ibss_devtype;
 345                 ctx->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
 346                 ctx->staging.filter_flags = RXON_FILTER_BCON_AWARE_MSK |
 347                                                   RXON_FILTER_ACCEPT_GRP_MSK;
 348                 break;
 349
 350         default:
 351                 IWL_ERR(priv, "Unsupported interface type %d\n",
 352                         ctx->vif->type);
 353                 break;
 354         }
 355
 356 #if 0
 357         /* TODO:  Figure out when short_preamble would be set and cache from
 358          * that */
 359         if (!hw_to_local(priv->hw)->short_preamble)
 360                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 361         else
 362                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 363 #endif
 364
 365         ch_info = iwl_get_channel_info(priv, priv->band,
 366                                        le16_to_cpu(ctx->active.channel));
 367
 368         if (!ch_info)
 369                 ch_info = &priv->channel_info[0];
 370
 371         ctx->staging.channel = cpu_to_le16(ch_info->channel);
 372         priv->band = ch_info->band;
 373
 374         iwl_set_flags_for_band(priv, ctx, priv->band, ctx->vif);
 375
 376         ctx->staging.ofdm_basic_rates =
 377             (IWL_OFDM_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
 378         ctx->staging.cck_basic_rates =
 379             (IWL_CCK_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;
 380
 381         /* clear both MIX and PURE40 mode flag */
 382         ctx->staging.flags &= ~(RXON_FLG_CHANNEL_MODE_MIXED |
 383                                         RXON_FLG_CHANNEL_MODE_PURE_40);
 384         if (ctx->vif)
 385                 memcpy(ctx->staging.node_addr, ctx->vif->addr, ETH_ALEN);
 386
 387         ctx->staging.ofdm_ht_single_stream_basic_rates = 0xff;
 388         ctx->staging.ofdm_ht_dual_stream_basic_rates = 0xff;
 389         ctx->staging.ofdm_ht_triple_stream_basic_rates = 0xff;
 390 }
 391
 392 void iwl_set_rate(struct iwl_priv *priv)
 393 {
 394         const struct ieee80211_supported_band *hw = NULL;
 395         struct ieee80211_rate *rate;
 396         struct iwl_rxon_context *ctx;
 397         int i;
 398
 399         hw = iwl_get_hw_mode(priv, priv->band);
 400         if (!hw) {
 401                 IWL_ERR(priv, "Failed to set rate: unable to get hw mode\n");
 402                 return;
 403         }
 404
 405         priv->active_rate = 0;
 406
 407         for (i = 0; i < hw->n_bitrates; i++) {
 408                 rate = &(hw->bitrates[i]);
 409                 if (rate->hw_value < IWL_RATE_COUNT_LEGACY)
 410                         priv->active_rate |= (1 << rate->hw_value);
 411         }
 412
 413         IWL_DEBUG_RATE(priv, "Set active_rate = %0x\n", priv->active_rate);
 414
 415         for_each_context(priv, ctx) {
 416                 ctx->staging.cck_basic_rates =
 417                     (IWL_CCK_BASIC_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;
 418
 419                 ctx->staging.ofdm_basic_rates =
 420                    (IWL_OFDM_BASIC_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
 421         }
 422 }
 423
 424 void iwl_chswitch_done(struct iwl_priv *priv, bool is_success)
 425 {
 426         /*
 427          * MULTI-FIXME
 428          * See iwlagn_mac_channel_switch.
 429          */
 430         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 431
 432         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 433                 return;
 434
 435         if (test_and_clear_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status))
 436                 ieee80211_chswitch_done(ctx->vif, is_success);
 437 }
 438
 439 #ifdef CONFIG_IWLWIFI_DEBUG
 440 void iwl_print_rx_config_cmd(struct iwl_priv *priv,
 441                              enum iwl_rxon_context_id ctxid)
 442 {
 443         struct iwl_rxon_context *ctx = &priv->contexts[ctxid];
 444         struct iwl_rxon_cmd *rxon = &ctx->staging;
 445
 446         IWL_DEBUG_RADIO(priv, "RX CONFIG:\n");
 447         iwl_print_hex_dump(priv, IWL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
 448         IWL_DEBUG_RADIO(priv, "u16 channel: 0x%x\n", le16_to_cpu(rxon->channel));
 449         IWL_DEBUG_RADIO(priv, "u32 flags: 0x%08X\n", le32_to_cpu(rxon->flags));
 450         IWL_DEBUG_RADIO(priv, "u32 filter_flags: 0x%08x\n",
 451                         le32_to_cpu(rxon->filter_flags));
 452         IWL_DEBUG_RADIO(priv, "u8 dev_type: 0x%x\n", rxon->dev_type);
 453         IWL_DEBUG_RADIO(priv, "u8 ofdm_basic_rates: 0x%02x\n",
 454                         rxon->ofdm_basic_rates);
 455         IWL_DEBUG_RADIO(priv, "u8 cck_basic_rates: 0x%02x\n", rxon->cck_basic_rates);
 456         IWL_DEBUG_RADIO(priv, "u8[6] node_addr: %pM\n", rxon->node_addr);
 457         IWL_DEBUG_RADIO(priv, "u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
 458         IWL_DEBUG_RADIO(priv, "u16 assoc_id: 0x%x\n", le16_to_cpu(rxon->assoc_id));
 459 }
 460 #endif
 461
 462 void iwlagn_fw_error(struct iwl_priv *priv, bool ondemand)
 463 {
 464         unsigned int reload_msec;
 465         unsigned long reload_jiffies;
 466
 467 #ifdef CONFIG_IWLWIFI_DEBUG
 468         if (iwl_have_debug_level(IWL_DL_FW_ERRORS))
 469                 iwl_print_rx_config_cmd(priv, IWL_RXON_CTX_BSS);
 470 #endif
 471
 472         /* uCode is no longer loaded. */
 473         priv->ucode_loaded = false;
 474
 475         /* Set the FW error flag -- cleared on iwl_down */
 476         set_bit(STATUS_FW_ERROR, &priv->shrd->status);
 477
 478         /* Cancel currently queued command. */
 479         clear_bit(STATUS_HCMD_ACTIVE, &priv->shrd->status);
 480
 481         iwl_abort_notification_waits(&priv->notif_wait);
 482
 483         /* Keep the restart process from trying to send host
 484          * commands by clearing the ready bit */
 485         clear_bit(STATUS_READY, &priv->status);
 486
 487         wake_up(&trans(priv)->wait_command_queue);
 488
 489         if (!ondemand) {
 490                 /*
 491                  * If firmware keep reloading, then it indicate something
 492                  * serious wrong and firmware having problem to recover
 493                  * from it. Instead of keep trying which will fill the syslog
 494                  * and hang the system, let's just stop it
 495                  */
 496                 reload_jiffies = jiffies;
 497                 reload_msec = jiffies_to_msecs((long) reload_jiffies -
 498                                         (long) priv->reload_jiffies);
 499                 priv->reload_jiffies = reload_jiffies;
 500                 if (reload_msec <= IWL_MIN_RELOAD_DURATION) {
 501                         priv->reload_count++;
 502                         if (priv->reload_count >= IWL_MAX_CONTINUE_RELOAD_CNT) {
 503                                 IWL_ERR(priv, "BUG_ON, Stop restarting\n");
 504                                 return;
 505                         }
 506                 } else
 507                         priv->reload_count = 0;
 508         }
 509
 510         if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 511                 if (iwlagn_mod_params.restart_fw) {
 512                         IWL_DEBUG_FW_ERRORS(priv,
 513                                   "Restarting adapter due to uCode error.\n");
 514                         queue_work(priv->workqueue, &priv->restart);
 515                 } else
 516                         IWL_DEBUG_FW_ERRORS(priv,
 517                                   "Detected FW error, but not restarting\n");
 518         }
 519 }
 520
 521 int iwl_set_tx_power(struct iwl_priv *priv, s8 tx_power, bool force)
 522 {
 523         int ret;
 524         s8 prev_tx_power;
 525         bool defer;
 526         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 527
 528         lockdep_assert_held(&priv->mutex);
 529
 530         if (priv->tx_power_user_lmt == tx_power && !force)
 531                 return 0;
 532
 533         if (tx_power < IWLAGN_TX_POWER_TARGET_POWER_MIN) {
 534                 IWL_WARN(priv,
 535                          "Requested user TXPOWER %d below lower limit %d.\n",
 536                          tx_power,
 537                          IWLAGN_TX_POWER_TARGET_POWER_MIN);
 538                 return -EINVAL;
 539         }
 540
 541         if (tx_power > priv->tx_power_device_lmt) {
 542                 IWL_WARN(priv,
 543                         "Requested user TXPOWER %d above upper limit %d.\n",
 544                          tx_power, priv->tx_power_device_lmt);
 545                 return -EINVAL;
 546         }
 547
 548         if (!iwl_is_ready_rf(priv))
 549                 return -EIO;
 550
 551         /* scan complete and commit_rxon use tx_power_next value,
 552          * it always need to be updated for newest request */
 553         priv->tx_power_next = tx_power;
 554
 555         /* do not set tx power when scanning or channel changing */
 556         defer = test_bit(STATUS_SCANNING, &priv->status) ||
 557                 memcmp(&ctx->active, &ctx->staging, sizeof(ctx->staging));
 558         if (defer && !force) {
 559                 IWL_DEBUG_INFO(priv, "Deferring tx power set\n");
 560                 return 0;
 561         }
 562
 563         prev_tx_power = priv->tx_power_user_lmt;
 564         priv->tx_power_user_lmt = tx_power;
 565
 566         ret = iwlagn_send_tx_power(priv);
 567
 568         /* if fail to set tx_power, restore the orig. tx power */
 569         if (ret) {
 570                 priv->tx_power_user_lmt = prev_tx_power;
 571                 priv->tx_power_next = prev_tx_power;
 572         }
 573         return ret;
 574 }
 575
 576 void iwl_send_bt_config(struct iwl_priv *priv)
 577 {
 578         struct iwl_bt_cmd bt_cmd = {
 579                 .lead_time = BT_LEAD_TIME_DEF,
 580                 .max_kill = BT_MAX_KILL_DEF,
 581                 .kill_ack_mask = 0,
 582                 .kill_cts_mask = 0,
 583         };
 584
 585         if (!iwlagn_mod_params.bt_coex_active)
 586                 bt_cmd.flags = BT_COEX_DISABLE;
 587         else
 588                 bt_cmd.flags = BT_COEX_ENABLE;
 589
 590         priv->bt_enable_flag = bt_cmd.flags;
 591         IWL_DEBUG_INFO(priv, "BT coex %s\n",
 592                 (bt_cmd.flags == BT_COEX_DISABLE) ? "disable" : "active");
 593
 594         if (iwl_dvm_send_cmd_pdu(priv, REPLY_BT_CONFIG,
 595                              CMD_SYNC, sizeof(struct iwl_bt_cmd), &bt_cmd))
 596                 IWL_ERR(priv, "failed to send BT Coex Config\n");
 597 }
 598
 599 int iwl_send_statistics_request(struct iwl_priv *priv, u8 flags, bool clear)
 600 {
 601         struct iwl_statistics_cmd statistics_cmd = {
 602                 .configuration_flags =
 603                         clear ? IWL_STATS_CONF_CLEAR_STATS : 0,
 604         };
 605
 606         if (flags & CMD_ASYNC)
 607                 return iwl_dvm_send_cmd_pdu(priv, REPLY_STATISTICS_CMD,
 608                                               CMD_ASYNC,
 609                                                sizeof(struct iwl_statistics_cmd),
 610                                                &statistics_cmd);
 611         else
 612                 return iwl_dvm_send_cmd_pdu(priv, REPLY_STATISTICS_CMD,
 613                                         CMD_SYNC,
 614                                         sizeof(struct iwl_statistics_cmd),
 615                                         &statistics_cmd);
 616 }
 617
 618
 619
 620
 621 #ifdef CONFIG_IWLWIFI_DEBUGFS
 622
 623 #define IWL_TRAFFIC_DUMP_SIZE   (IWL_TRAFFIC_ENTRY_SIZE * IWL_TRAFFIC_ENTRIES)
 624
 625 void iwl_reset_traffic_log(struct iwl_priv *priv)
 626 {
 627         priv->tx_traffic_idx = 0;
 628         priv->rx_traffic_idx = 0;
 629         if (priv->tx_traffic)
 630                 memset(priv->tx_traffic, 0, IWL_TRAFFIC_DUMP_SIZE);
 631         if (priv->rx_traffic)
 632                 memset(priv->rx_traffic, 0, IWL_TRAFFIC_DUMP_SIZE);
 633 }
 634
 635 int iwl_alloc_traffic_mem(struct iwl_priv *priv)
 636 {
 637         u32 traffic_size = IWL_TRAFFIC_DUMP_SIZE;
 638
 639         if (iwl_have_debug_level(IWL_DL_TX)) {
 640                 if (!priv->tx_traffic) {
 641                         priv->tx_traffic =
 642                                 kzalloc(traffic_size, GFP_KERNEL);
 643                         if (!priv->tx_traffic)
 644                                 return -ENOMEM;
 645                 }
 646         }
 647         if (iwl_have_debug_level(IWL_DL_RX)) {
 648                 if (!priv->rx_traffic) {
 649                         priv->rx_traffic =
 650                                 kzalloc(traffic_size, GFP_KERNEL);
 651                         if (!priv->rx_traffic)
 652                                 return -ENOMEM;
 653                 }
 654         }
 655         iwl_reset_traffic_log(priv);
 656         return 0;
 657 }
 658
 659 void iwl_free_traffic_mem(struct iwl_priv *priv)
 660 {
 661         kfree(priv->tx_traffic);
 662         priv->tx_traffic = NULL;
 663
 664         kfree(priv->rx_traffic);
 665         priv->rx_traffic = NULL;
 666 }
 667
 668 void iwl_dbg_log_tx_data_frame(struct iwl_priv *priv,
 669                       u16 length, struct ieee80211_hdr *header)
 670 {
 671         __le16 fc;
 672         u16 len;
 673
 674         if (likely(!iwl_have_debug_level(IWL_DL_TX)))
 675                 return;
 676
 677         if (!priv->tx_traffic)
 678                 return;
 679
 680         fc = header->frame_control;
 681         if (ieee80211_is_data(fc)) {
 682                 len = (length > IWL_TRAFFIC_ENTRY_SIZE)
 683                        ? IWL_TRAFFIC_ENTRY_SIZE : length;
 684                 memcpy((priv->tx_traffic +
 685                        (priv->tx_traffic_idx * IWL_TRAFFIC_ENTRY_SIZE)),
 686                        header, len);
 687                 priv->tx_traffic_idx =
 688                         (priv->tx_traffic_idx + 1) % IWL_TRAFFIC_ENTRIES;
 689         }
 690 }
 691
 692 void iwl_dbg_log_rx_data_frame(struct iwl_priv *priv,
 693                       u16 length, struct ieee80211_hdr *header)
 694 {
 695         __le16 fc;
 696         u16 len;
 697
 698         if (likely(!iwl_have_debug_level(IWL_DL_RX)))
 699                 return;
 700
 701         if (!priv->rx_traffic)
 702                 return;
 703
 704         fc = header->frame_control;
 705         if (ieee80211_is_data(fc)) {
 706                 len = (length > IWL_TRAFFIC_ENTRY_SIZE)
 707                        ? IWL_TRAFFIC_ENTRY_SIZE : length;
 708                 memcpy((priv->rx_traffic +
 709                        (priv->rx_traffic_idx * IWL_TRAFFIC_ENTRY_SIZE)),
 710                        header, len);
 711                 priv->rx_traffic_idx =
 712                         (priv->rx_traffic_idx + 1) % IWL_TRAFFIC_ENTRIES;
 713         }
 714 }
 715
 716 const char *get_mgmt_string(int cmd)
 717 {
 718         switch (cmd) {
 719                 IWL_CMD(MANAGEMENT_ASSOC_REQ);
 720                 IWL_CMD(MANAGEMENT_ASSOC_RESP);
 721                 IWL_CMD(MANAGEMENT_REASSOC_REQ);
 722                 IWL_CMD(MANAGEMENT_REASSOC_RESP);
 723                 IWL_CMD(MANAGEMENT_PROBE_REQ);
 724                 IWL_CMD(MANAGEMENT_PROBE_RESP);
 725                 IWL_CMD(MANAGEMENT_BEACON);
 726                 IWL_CMD(MANAGEMENT_ATIM);
 727                 IWL_CMD(MANAGEMENT_DISASSOC);
 728                 IWL_CMD(MANAGEMENT_AUTH);
 729                 IWL_CMD(MANAGEMENT_DEAUTH);
 730                 IWL_CMD(MANAGEMENT_ACTION);
 731         default:
 732                 return "UNKNOWN";
 733
 734         }
 735 }
 736
 737 const char *get_ctrl_string(int cmd)
 738 {
 739         switch (cmd) {
 740                 IWL_CMD(CONTROL_BACK_REQ);
 741                 IWL_CMD(CONTROL_BACK);
 742                 IWL_CMD(CONTROL_PSPOLL);
 743                 IWL_CMD(CONTROL_RTS);
 744                 IWL_CMD(CONTROL_CTS);
 745                 IWL_CMD(CONTROL_ACK);
 746                 IWL_CMD(CONTROL_CFEND);
 747                 IWL_CMD(CONTROL_CFENDACK);
 748         default:
 749                 return "UNKNOWN";
 750
 751         }
 752 }
 753
 754 void iwl_clear_traffic_stats(struct iwl_priv *priv)
 755 {
 756         memset(&priv->tx_stats, 0, sizeof(struct traffic_stats));
 757         memset(&priv->rx_stats, 0, sizeof(struct traffic_stats));
 758 }
 759
 760 /*
 761  * if CONFIG_IWLWIFI_DEBUGFS defined, iwl_update_stats function will
 762  * record all the MGMT, CTRL and DATA pkt for both TX and Rx pass.
 763  * Use debugFs to display the rx/rx_statistics
 764  * if CONFIG_IWLWIFI_DEBUGFS not being defined, then no MGMT and CTRL
 765  * information will be recorded, but DATA pkt still will be recorded
 766  * for the reason of iwl_led.c need to control the led blinking based on
 767  * number of tx and rx data.
 768  *
 769  */
 770 void iwl_update_stats(struct iwl_priv *priv, bool is_tx, __le16 fc, u16 len)
 771 {
 772         struct traffic_stats    *stats;
 773
 774         if (is_tx)
 775                 stats = &priv->tx_stats;
 776         else
 777                 stats = &priv->rx_stats;
 778
 779         if (ieee80211_is_mgmt(fc)) {
 780                 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
 781                 case cpu_to_le16(IEEE80211_STYPE_ASSOC_REQ):
 782                         stats->mgmt[MANAGEMENT_ASSOC_REQ]++;
 783                         break;
 784                 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
 785                         stats->mgmt[MANAGEMENT_ASSOC_RESP]++;
 786                         break;
 787                 case cpu_to_le16(IEEE80211_STYPE_REASSOC_REQ):
 788                         stats->mgmt[MANAGEMENT_REASSOC_REQ]++;
 789                         break;
 790                 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
 791                         stats->mgmt[MANAGEMENT_REASSOC_RESP]++;
 792                         break;
 793                 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
 794                         stats->mgmt[MANAGEMENT_PROBE_REQ]++;
 795                         break;
 796                 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
 797                         stats->mgmt[MANAGEMENT_PROBE_RESP]++;
 798                         break;
 799                 case cpu_to_le16(IEEE80211_STYPE_BEACON):
 800                         stats->mgmt[MANAGEMENT_BEACON]++;
 801                         break;
 802                 case cpu_to_le16(IEEE80211_STYPE_ATIM):
 803                         stats->mgmt[MANAGEMENT_ATIM]++;
 804                         break;
 805                 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
 806                         stats->mgmt[MANAGEMENT_DISASSOC]++;
 807                         break;
 808                 case cpu_to_le16(IEEE80211_STYPE_AUTH):
 809                         stats->mgmt[MANAGEMENT_AUTH]++;
 810                         break;
 811                 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
 812                         stats->mgmt[MANAGEMENT_DEAUTH]++;
 813                         break;
 814                 case cpu_to_le16(IEEE80211_STYPE_ACTION):
 815                         stats->mgmt[MANAGEMENT_ACTION]++;
 816                         break;
 817                 }
 818         } else if (ieee80211_is_ctl(fc)) {
 819                 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
 820                 case cpu_to_le16(IEEE80211_STYPE_BACK_REQ):
 821                         stats->ctrl[CONTROL_BACK_REQ]++;
 822                         break;
 823                 case cpu_to_le16(IEEE80211_STYPE_BACK):
 824                         stats->ctrl[CONTROL_BACK]++;
 825                         break;
 826                 case cpu_to_le16(IEEE80211_STYPE_PSPOLL):
 827                         stats->ctrl[CONTROL_PSPOLL]++;
 828                         break;
 829                 case cpu_to_le16(IEEE80211_STYPE_RTS):
 830                         stats->ctrl[CONTROL_RTS]++;
 831                         break;
 832                 case cpu_to_le16(IEEE80211_STYPE_CTS):
 833                         stats->ctrl[CONTROL_CTS]++;
 834                         break;
 835                 case cpu_to_le16(IEEE80211_STYPE_ACK):
 836                         stats->ctrl[CONTROL_ACK]++;
 837                         break;
 838                 case cpu_to_le16(IEEE80211_STYPE_CFEND):
 839                         stats->ctrl[CONTROL_CFEND]++;
 840                         break;
 841                 case cpu_to_le16(IEEE80211_STYPE_CFENDACK):
 842                         stats->ctrl[CONTROL_CFENDACK]++;
 843                         break;
 844                 }
 845         } else {
 846                 /* data */
 847                 stats->data_cnt++;
 848                 stats->data_bytes += len;
 849         }
 850 }
 851 #endif
 852
 853 static void iwl_force_rf_reset(struct iwl_priv *priv)
 854 {
 855         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 856                 return;
 857
 858         if (!iwl_is_any_associated(priv)) {
 859                 IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n");
 860                 return;
 861         }
 862         /*
 863          * There is no easy and better way to force reset the radio,
 864          * the only known method is switching channel which will force to
 865          * reset and tune the radio.
 866          * Use internal short scan (single channel) operation to should
 867          * achieve this objective.
 868          * Driver should reset the radio when number of consecutive missed
 869          * beacon, or any other uCode error condition detected.
 870          */
 871         IWL_DEBUG_INFO(priv, "perform radio reset.\n");
 872         iwl_internal_short_hw_scan(priv);
 873 }
 874
 875
 876 int iwl_force_reset(struct iwl_priv *priv, int mode, bool external)
 877 {
 878         struct iwl_force_reset *force_reset;
 879
 880         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 881                 return -EINVAL;
 882
 883         if (mode >= IWL_MAX_FORCE_RESET) {
 884                 IWL_DEBUG_INFO(priv, "invalid reset request.\n");
 885                 return -EINVAL;
 886         }
 887         force_reset = &priv->force_reset[mode];
 888         force_reset->reset_request_count++;
 889         if (!external) {
 890                 if (force_reset->last_force_reset_jiffies &&
 891                     time_after(force_reset->last_force_reset_jiffies +
 892                     force_reset->reset_duration, jiffies)) {
 893                         IWL_DEBUG_INFO(priv, "force reset rejected\n");
 894                         force_reset->reset_reject_count++;
 895                         return -EAGAIN;
 896                 }
 897         }
 898         force_reset->reset_success_count++;
 899         force_reset->last_force_reset_jiffies = jiffies;
 900         IWL_DEBUG_INFO(priv, "perform force reset (%d)\n", mode);
 901         switch (mode) {
 902         case IWL_RF_RESET:
 903                 iwl_force_rf_reset(priv);
 904                 break;
 905         case IWL_FW_RESET:
 906                 /*
 907                  * if the request is from external(ex: debugfs),
 908                  * then always perform the request in regardless the module
 909                  * parameter setting
 910                  * if the request is from internal (uCode error or driver
 911                  * detect failure), then fw_restart module parameter
 912                  * need to be check before performing firmware reload
 913                  */
 914                 if (!external && !iwlagn_mod_params.restart_fw) {
 915                         IWL_DEBUG_INFO(priv, "Cancel firmware reload based on "
 916                                        "module parameter setting\n");
 917                         break;
 918                 }
 919                 IWL_ERR(priv, "On demand firmware reload\n");
 920                 iwlagn_fw_error(priv, true);
 921                 break;
 922         }
 923         return 0;
 924 }
 925
 926
 927 int iwl_cmd_echo_test(struct iwl_priv *priv)
 928 {
 929         int ret;
 930         struct iwl_host_cmd cmd = {
 931                 .id = REPLY_ECHO,
 932                 .len = { 0 },
 933                 .flags = CMD_SYNC,
 934         };
 935
 936         ret = iwl_dvm_send_cmd(priv, &cmd);
 937         if (ret)
 938                 IWL_ERR(priv, "echo testing fail: 0X%x\n", ret);
 939         else
 940                 IWL_DEBUG_INFO(priv, "echo testing pass\n");
 941         return ret;
 942 }
 943
 944 static inline int iwl_check_stuck_queue(struct iwl_priv *priv, int txq)
 945 {
 946         if (iwl_trans_check_stuck_queue(trans(priv), txq)) {
 947                 int ret;
 948                 ret = iwl_force_reset(priv, IWL_FW_RESET, false);
 949                 return (ret == -EAGAIN) ? 0 : 1;
 950         }
 951         return 0;
 952 }
 953
 954 /*
 955  * Making watchdog tick be a quarter of timeout assure we will
 956  * discover the queue hung between timeout and 1.25*timeout
 957  */
 958 #define IWL_WD_TICK(timeout) ((timeout) / 4)
 959
 960 /*
 961  * Watchdog timer callback, we check each tx queue for stuck, if if hung
 962  * we reset the firmware. If everything is fine just rearm the timer.
 963  */
 964 void iwl_bg_watchdog(unsigned long data)
 965 {
 966         struct iwl_priv *priv = (struct iwl_priv *)data;
 967         int cnt;
 968         unsigned long timeout;
 969
 970         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 971                 return;
 972
 973         if (iwl_is_rfkill(priv))
 974                 return;
 975
 976         timeout = hw_params(priv).wd_timeout;
 977         if (timeout == 0)
 978                 return;
 979
 980         /* monitor and check for stuck queues */
 981         for (cnt = 0; cnt < cfg(priv)->base_params->num_of_queues; cnt++)
 982                 if (iwl_check_stuck_queue(priv, cnt))
 983                         return;
 984
 985         mod_timer(&priv->watchdog, jiffies +
 986                   msecs_to_jiffies(IWL_WD_TICK(timeout)));
 987 }
 988
 989 void iwl_setup_watchdog(struct iwl_priv *priv)
 990 {
 991         unsigned int timeout = hw_params(priv).wd_timeout;
 992
 993         if (!iwlagn_mod_params.wd_disable) {
 994                 /* use system default */
 995                 if (timeout && !cfg(priv)->base_params->wd_disable)
 996                         mod_timer(&priv->watchdog,
 997                                 jiffies +
 998                                 msecs_to_jiffies(IWL_WD_TICK(timeout)));
 999                 else
1000                         del_timer(&priv->watchdog);
1001         } else {
1002                 /* module parameter overwrite default configuration */
1003                 if (timeout && iwlagn_mod_params.wd_disable == 2)
1004                         mod_timer(&priv->watchdog,
1005                                 jiffies +
1006                                 msecs_to_jiffies(IWL_WD_TICK(timeout)));
1007                 else
1008                         del_timer(&priv->watchdog);
1009         }
1010 }
1011
1012 /**
1013  * iwl_beacon_time_mask_low - mask of lower 32 bit of beacon time
1014  * @priv -- pointer to iwl_priv data structure
1015  * @tsf_bits -- number of bits need to shift for masking)
1016  */
1017 static inline u32 iwl_beacon_time_mask_low(struct iwl_priv *priv,
1018                                            u16 tsf_bits)
1019 {
1020         return (1 << tsf_bits) - 1;
1021 }
1022
1023 /**
1024  * iwl_beacon_time_mask_high - mask of higher 32 bit of beacon time
1025  * @priv -- pointer to iwl_priv data structure
1026  * @tsf_bits -- number of bits need to shift for masking)
1027  */
1028 static inline u32 iwl_beacon_time_mask_high(struct iwl_priv *priv,
1029                                             u16 tsf_bits)
1030 {
1031         return ((1 << (32 - tsf_bits)) - 1) << tsf_bits;
1032 }
1033
1034 /*
1035  * extended beacon time format
1036  * time in usec will be changed into a 32-bit value in extended:internal format
1037  * the extended part is the beacon counts
1038  * the internal part is the time in usec within one beacon interval
1039  */
1040 u32 iwl_usecs_to_beacons(struct iwl_priv *priv, u32 usec, u32 beacon_interval)
1041 {
1042         u32 quot;
1043         u32 rem;
1044         u32 interval = beacon_interval * TIME_UNIT;
1045
1046         if (!interval || !usec)
1047                 return 0;
1048
1049         quot = (usec / interval) &
1050                 (iwl_beacon_time_mask_high(priv, IWLAGN_EXT_BEACON_TIME_POS) >>
1051                 IWLAGN_EXT_BEACON_TIME_POS);
1052         rem = (usec % interval) & iwl_beacon_time_mask_low(priv,
1053                                    IWLAGN_EXT_BEACON_TIME_POS);
1054
1055         return (quot << IWLAGN_EXT_BEACON_TIME_POS) + rem;
1056 }
1057
1058 /* base is usually what we get from ucode with each received frame,
1059  * the same as HW timer counter counting down
1060  */
1061 __le32 iwl_add_beacon_time(struct iwl_priv *priv, u32 base,
1062                            u32 addon, u32 beacon_interval)
1063 {
1064         u32 base_low = base & iwl_beacon_time_mask_low(priv,
1065                                 IWLAGN_EXT_BEACON_TIME_POS);
1066         u32 addon_low = addon & iwl_beacon_time_mask_low(priv,
1067                                 IWLAGN_EXT_BEACON_TIME_POS);
1068         u32 interval = beacon_interval * TIME_UNIT;
1069         u32 res = (base & iwl_beacon_time_mask_high(priv,
1070                                 IWLAGN_EXT_BEACON_TIME_POS)) +
1071                                 (addon & iwl_beacon_time_mask_high(priv,
1072                                 IWLAGN_EXT_BEACON_TIME_POS));
1073
1074         if (base_low > addon_low)
1075                 res += base_low - addon_low;
1076         else if (base_low < addon_low) {
1077                 res += interval + base_low - addon_low;
1078                 res += (1 << IWLAGN_EXT_BEACON_TIME_POS);
1079         } else
1080                 res += (1 << IWLAGN_EXT_BEACON_TIME_POS);
1081
1082         return cpu_to_le32(res);
1083 }
1084
1085 void iwl_set_hw_rfkill_state(struct iwl_op_mode *op_mode, bool state)
1086 {
1087         struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
1088
1089         if (state)
1090                 set_bit(STATUS_RF_KILL_HW, &priv->status);
1091         else
1092                 clear_bit(STATUS_RF_KILL_HW, &priv->status);
1093
1094         wiphy_rfkill_set_hw_state(priv->hw->wiphy, state);
1095 }
1096
1097 void iwl_free_skb(struct iwl_op_mode *op_mode, struct sk_buff *skb)
1098 {
1099         struct ieee80211_tx_info *info;
1100
1101         info = IEEE80211_SKB_CB(skb);
1102         kmem_cache_free(iwl_tx_cmd_pool, (info->driver_data[1]));
1103         dev_kfree_skb_any(skb);
1104 }