drivers/net/wireless/intel/iwlwifi/dvm/rx.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2015 Intel Deutschland GmbH
   5  *
   6  * Portions of this file are derived from the ipw3945 project, as well
   7  * as portionhelp of the ieee80211 subsystem header files.
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  * more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along with
  19  * this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  21  *
  22  * The full GNU General Public License is included in this distribution in the
  23  * file called LICENSE.
  24  *
  25  * Contact Information:
  26  *  Intel Linux Wireless <linuxwifi@intel.com>
  27  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  28  *
  29  *****************************************************************************/
  30
  31 #include <linux/etherdevice.h>
  32 #include <linux/slab.h>
  33 #include <linux/sched.h>
  34 #include <net/mac80211.h>
  35 #include <asm/unaligned.h>
  36
  37 #include "iwl-trans.h"
  38 #include "iwl-io.h"
  39 #include "dev.h"
  40 #include "calib.h"
  41 #include "agn.h"
  42
  43 /******************************************************************************
  44  *
  45  * Generic RX handler implementations
  46  *
  47  ******************************************************************************/
  48
  49 static void iwlagn_rx_reply_error(struct iwl_priv *priv,
  50                                   struct iwl_rx_cmd_buffer *rxb)
  51 {
  52         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  53         struct iwl_error_resp *err_resp = (void *)pkt->data;
  54
  55         IWL_ERR(priv, "Error Reply type 0x%08X cmd REPLY_ERROR (0x%02X) "
  56                 "seq 0x%04X ser 0x%08X\n",
  57                 le32_to_cpu(err_resp->error_type),
  58                 err_resp->cmd_id,
  59                 le16_to_cpu(err_resp->bad_cmd_seq_num),
  60                 le32_to_cpu(err_resp->error_info));
  61 }
  62
  63 static void iwlagn_rx_csa(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb)
  64 {
  65         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  66         struct iwl_csa_notification *csa = (void *)pkt->data;
  67         /*
  68          * MULTI-FIXME
  69          * See iwlagn_mac_channel_switch.
  70          */
  71         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
  72         struct iwl_rxon_cmd *rxon = (void *)&ctx->active;
  73
  74         if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status))
  75                 return;
  76
  77         if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) {
  78                 rxon->channel = csa->channel;
  79                 ctx->staging.channel = csa->channel;
  80                 IWL_DEBUG_11H(priv, "CSA notif: channel %d\n",
  81                               le16_to_cpu(csa->channel));
  82                 iwl_chswitch_done(priv, true);
  83         } else {
  84                 IWL_ERR(priv, "CSA notif (fail) : channel %d\n",
  85                         le16_to_cpu(csa->channel));
  86                 iwl_chswitch_done(priv, false);
  87         }
  88 }
  89
  90
  91 static void iwlagn_rx_spectrum_measure_notif(struct iwl_priv *priv,
  92                                              struct iwl_rx_cmd_buffer *rxb)
  93 {
  94         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  95         struct iwl_spectrum_notification *report = (void *)pkt->data;
  96
  97         if (!report->state) {
  98                 IWL_DEBUG_11H(priv,
  99                         "Spectrum Measure Notification: Start\n");
 100                 return;
 101         }
 102
 103         memcpy(&priv->measure_report, report, sizeof(*report));
 104         priv->measurement_status |= MEASUREMENT_READY;
 105 }
 106
 107 static void iwlagn_rx_pm_sleep_notif(struct iwl_priv *priv,
 108                                      struct iwl_rx_cmd_buffer *rxb)
 109 {
 110 #ifdef CONFIG_IWLWIFI_DEBUG
 111         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 112         struct iwl_sleep_notification *sleep = (void *)pkt->data;
 113         IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n",
 114                      sleep->pm_sleep_mode, sleep->pm_wakeup_src);
 115 #endif
 116 }
 117
 118 static void iwlagn_rx_pm_debug_statistics_notif(struct iwl_priv *priv,
 119                                                 struct iwl_rx_cmd_buffer *rxb)
 120 {
 121         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 122         u32 __maybe_unused len = iwl_rx_packet_len(pkt);
 123         IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled "
 124                         "notification for PM_DEBUG_STATISTIC_NOTIFIC:\n", len);
 125         iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->data, len);
 126 }
 127
 128 static void iwlagn_rx_beacon_notif(struct iwl_priv *priv,
 129                                    struct iwl_rx_cmd_buffer *rxb)
 130 {
 131         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 132         struct iwlagn_beacon_notif *beacon = (void *)pkt->data;
 133 #ifdef CONFIG_IWLWIFI_DEBUG
 134         u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status);
 135         u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);
 136
 137         IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d "
 138                 "tsf:0x%.8x%.8x rate:%d\n",
 139                 status & TX_STATUS_MSK,
 140                 beacon->beacon_notify_hdr.failure_frame,
 141                 le32_to_cpu(beacon->ibss_mgr_status),
 142                 le32_to_cpu(beacon->high_tsf),
 143                 le32_to_cpu(beacon->low_tsf), rate);
 144 #endif
 145
 146         priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);
 147 }
 148
 149 /**
 150  * iwl_good_plcp_health - checks for plcp error.
 151  *
 152  * When the plcp error is exceeding the thresholds, reset the radio
 153  * to improve the throughput.
 154  */
 155 static bool iwlagn_good_plcp_health(struct iwl_priv *priv,
 156                                  struct statistics_rx_phy *cur_ofdm,
 157                                  struct statistics_rx_ht_phy *cur_ofdm_ht,
 158                                  unsigned int msecs)
 159 {
 160         int delta;
 161         int threshold = priv->plcp_delta_threshold;
 162
 163         if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
 164                 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
 165                 return true;
 166         }
 167
 168         delta = le32_to_cpu(cur_ofdm->plcp_err) -
 169                 le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) +
 170                 le32_to_cpu(cur_ofdm_ht->plcp_err) -
 171                 le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err);
 172
 173         /* Can be negative if firmware reset statistics */
 174         if (delta <= 0)
 175                 return true;
 176
 177         if ((delta * 100 / msecs) > threshold) {
 178                 IWL_DEBUG_RADIO(priv,
 179                                 "plcp health threshold %u delta %d msecs %u\n",
 180                                 threshold, delta, msecs);
 181                 return false;
 182         }
 183
 184         return true;
 185 }
 186
 187 int iwl_force_rf_reset(struct iwl_priv *priv, bool external)
 188 {
 189         struct iwl_rf_reset *rf_reset;
 190
 191         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 192                 return -EAGAIN;
 193
 194         if (!iwl_is_any_associated(priv)) {
 195                 IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n");
 196                 return -ENOLINK;
 197         }
 198
 199         rf_reset = &priv->rf_reset;
 200         rf_reset->reset_request_count++;
 201         if (!external && rf_reset->last_reset_jiffies &&
 202             time_after(rf_reset->last_reset_jiffies +
 203                        IWL_DELAY_NEXT_FORCE_RF_RESET, jiffies)) {
 204                 IWL_DEBUG_INFO(priv, "RF reset rejected\n");
 205                 rf_reset->reset_reject_count++;
 206                 return -EAGAIN;
 207         }
 208         rf_reset->reset_success_count++;
 209         rf_reset->last_reset_jiffies = jiffies;
 210
 211         /*
 212          * There is no easy and better way to force reset the radio,
 213          * the only known method is switching channel which will force to
 214          * reset and tune the radio.
 215          * Use internal short scan (single channel) operation to should
 216          * achieve this objective.
 217          * Driver should reset the radio when number of consecutive missed
 218          * beacon, or any other uCode error condition detected.
 219          */
 220         IWL_DEBUG_INFO(priv, "perform radio reset.\n");
 221         iwl_internal_short_hw_scan(priv);
 222         return 0;
 223 }
 224
 225
 226 static void iwlagn_recover_from_statistics(struct iwl_priv *priv,
 227                                 struct statistics_rx_phy *cur_ofdm,
 228                                 struct statistics_rx_ht_phy *cur_ofdm_ht,
 229                                 struct statistics_tx *tx,
 230                                 unsigned long stamp)
 231 {
 232         unsigned int msecs;
 233
 234         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 235                 return;
 236
 237         msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies);
 238
 239         /* Only gather statistics and update time stamp when not associated */
 240         if (!iwl_is_any_associated(priv))
 241                 return;
 242
 243         /* Do not check/recover when do not have enough statistics data */
 244         if (msecs < 99)
 245                 return;
 246
 247         if (!iwlagn_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs))
 248                 iwl_force_rf_reset(priv, false);
 249 }
 250
 251 /* Calculate noise level, based on measurements during network silence just
 252  *   before arriving beacon.  This measurement can be done only if we know
 253  *   exactly when to expect beacons, therefore only when we're associated. */
 254 static void iwlagn_rx_calc_noise(struct iwl_priv *priv)
 255 {
 256         struct statistics_rx_non_phy *rx_info;
 257         int num_active_rx = 0;
 258         int total_silence = 0;
 259         int bcn_silence_a, bcn_silence_b, bcn_silence_c;
 260         int last_rx_noise;
 261
 262         rx_info = &priv->statistics.rx_non_phy;
 263
 264         bcn_silence_a =
 265                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 266         bcn_silence_b =
 267                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 268         bcn_silence_c =
 269                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 270
 271         if (bcn_silence_a) {
 272                 total_silence += bcn_silence_a;
 273                 num_active_rx++;
 274         }
 275         if (bcn_silence_b) {
 276                 total_silence += bcn_silence_b;
 277                 num_active_rx++;
 278         }
 279         if (bcn_silence_c) {
 280                 total_silence += bcn_silence_c;
 281                 num_active_rx++;
 282         }
 283
 284         /* Average among active antennas */
 285         if (num_active_rx)
 286                 last_rx_noise = (total_silence / num_active_rx) - 107;
 287         else
 288                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 289
 290         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 291                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 292                         last_rx_noise);
 293 }
 294
 295 #ifdef CONFIG_IWLWIFI_DEBUGFS
 296 /*
 297  *  based on the assumption of all statistics counter are in DWORD
 298  *  FIXME: This function is for debugging, do not deal with
 299  *  the case of counters roll-over.
 300  */
 301 static void accum_stats(__le32 *prev, __le32 *cur, __le32 *delta,
 302                         __le32 *max_delta, __le32 *accum, int size)
 303 {
 304         int i;
 305
 306         for (i = 0;
 307              i < size / sizeof(__le32);
 308              i++, prev++, cur++, delta++, max_delta++, accum++) {
 309                 if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) {
 310                         *delta = cpu_to_le32(
 311                                 le32_to_cpu(*cur) - le32_to_cpu(*prev));
 312                         le32_add_cpu(accum, le32_to_cpu(*delta));
 313                         if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta))
 314                                 *max_delta = *delta;
 315                 }
 316         }
 317 }
 318
 319 static void
 320 iwlagn_accumulative_statistics(struct iwl_priv *priv,
 321                             struct statistics_general_common *common,
 322                             struct statistics_rx_non_phy *rx_non_phy,
 323                             struct statistics_rx_phy *rx_ofdm,
 324                             struct statistics_rx_ht_phy *rx_ofdm_ht,
 325                             struct statistics_rx_phy *rx_cck,
 326                             struct statistics_tx *tx,
 327                             struct statistics_bt_activity *bt_activity)
 328 {
 329 #define ACCUM(_name)    \
 330         accum_stats((__le32 *)&priv->statistics._name,          \
 331                     (__le32 *)_name,                            \
 332                     (__le32 *)&priv->delta_stats._name,         \
 333                     (__le32 *)&priv->max_delta_stats._name,     \
 334                     (__le32 *)&priv->accum_stats._name,         \
 335                     sizeof(*_name));
 336
 337         ACCUM(common);
 338         ACCUM(rx_non_phy);
 339         ACCUM(rx_ofdm);
 340         ACCUM(rx_ofdm_ht);
 341         ACCUM(rx_cck);
 342         ACCUM(tx);
 343         if (bt_activity)
 344                 ACCUM(bt_activity);
 345 #undef ACCUM
 346 }
 347 #else
 348 static inline void
 349 iwlagn_accumulative_statistics(struct iwl_priv *priv,
 350                             struct statistics_general_common *common,
 351                             struct statistics_rx_non_phy *rx_non_phy,
 352                             struct statistics_rx_phy *rx_ofdm,
 353                             struct statistics_rx_ht_phy *rx_ofdm_ht,
 354                             struct statistics_rx_phy *rx_cck,
 355                             struct statistics_tx *tx,
 356                             struct statistics_bt_activity *bt_activity)
 357 {
 358 }
 359 #endif
 360
 361 static void iwlagn_rx_statistics(struct iwl_priv *priv,
 362                                  struct iwl_rx_cmd_buffer *rxb)
 363 {
 364         unsigned long stamp = jiffies;
 365         const int reg_recalib_period = 60;
 366         int change;
 367         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 368         u32 len = iwl_rx_packet_payload_len(pkt);
 369         __le32 *flag;
 370         struct statistics_general_common *common;
 371         struct statistics_rx_non_phy *rx_non_phy;
 372         struct statistics_rx_phy *rx_ofdm;
 373         struct statistics_rx_ht_phy *rx_ofdm_ht;
 374         struct statistics_rx_phy *rx_cck;
 375         struct statistics_tx *tx;
 376         struct statistics_bt_activity *bt_activity;
 377
 378         IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n",
 379                      len);
 380
 381         spin_lock(&priv->statistics.lock);
 382
 383         if (len == sizeof(struct iwl_bt_notif_statistics)) {
 384                 struct iwl_bt_notif_statistics *stats;
 385                 stats = (void *)&pkt->data;
 386                 flag = &stats->flag;
 387                 common = &stats->general.common;
 388                 rx_non_phy = &stats->rx.general.common;
 389                 rx_ofdm = &stats->rx.ofdm;
 390                 rx_ofdm_ht = &stats->rx.ofdm_ht;
 391                 rx_cck = &stats->rx.cck;
 392                 tx = &stats->tx;
 393                 bt_activity = &stats->general.activity;
 394
 395 #ifdef CONFIG_IWLWIFI_DEBUGFS
 396                 /* handle this exception directly */
 397                 priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills;
 398                 le32_add_cpu(&priv->statistics.accum_num_bt_kills,
 399                              le32_to_cpu(stats->rx.general.num_bt_kills));
 400 #endif
 401         } else if (len == sizeof(struct iwl_notif_statistics)) {
 402                 struct iwl_notif_statistics *stats;
 403                 stats = (void *)&pkt->data;
 404                 flag = &stats->flag;
 405                 common = &stats->general.common;
 406                 rx_non_phy = &stats->rx.general;
 407                 rx_ofdm = &stats->rx.ofdm;
 408                 rx_ofdm_ht = &stats->rx.ofdm_ht;
 409                 rx_cck = &stats->rx.cck;
 410                 tx = &stats->tx;
 411                 bt_activity = NULL;
 412         } else {
 413                 WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n",
 414                           len, sizeof(struct iwl_bt_notif_statistics),
 415                           sizeof(struct iwl_notif_statistics));
 416                 spin_unlock(&priv->statistics.lock);
 417                 return;
 418         }
 419
 420         change = common->temperature != priv->statistics.common.temperature ||
 421                  (*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 422                  (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK);
 423
 424         iwlagn_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm,
 425                                     rx_ofdm_ht, rx_cck, tx, bt_activity);
 426
 427         iwlagn_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp);
 428
 429         priv->statistics.flag = *flag;
 430         memcpy(&priv->statistics.common, common, sizeof(*common));
 431         memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy));
 432         memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm));
 433         memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht));
 434         memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck));
 435         memcpy(&priv->statistics.tx, tx, sizeof(*tx));
 436 #ifdef CONFIG_IWLWIFI_DEBUGFS
 437         if (bt_activity)
 438                 memcpy(&priv->statistics.bt_activity, bt_activity,
 439                         sizeof(*bt_activity));
 440 #endif
 441
 442         priv->rx_statistics_jiffies = stamp;
 443
 444         set_bit(STATUS_STATISTICS, &priv->status);
 445
 446         /* Reschedule the statistics timer to occur in
 447          * reg_recalib_period seconds to ensure we get a
 448          * thermal update even if the uCode doesn't give
 449          * us one */
 450         mod_timer(&priv->statistics_periodic, jiffies +
 451                   msecs_to_jiffies(reg_recalib_period * 1000));
 452
 453         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 454             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 455                 iwlagn_rx_calc_noise(priv);
 456                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 457         }
 458         if (priv->lib->temperature && change)
 459                 priv->lib->temperature(priv);
 460
 461         spin_unlock(&priv->statistics.lock);
 462 }
 463
 464 static void iwlagn_rx_reply_statistics(struct iwl_priv *priv,
 465                                        struct iwl_rx_cmd_buffer *rxb)
 466 {
 467         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 468         struct iwl_notif_statistics *stats = (void *)pkt->data;
 469
 470         if (le32_to_cpu(stats->flag) & UCODE_STATISTICS_CLEAR_MSK) {
 471 #ifdef CONFIG_IWLWIFI_DEBUGFS
 472                 memset(&priv->accum_stats, 0,
 473                         sizeof(priv->accum_stats));
 474                 memset(&priv->delta_stats, 0,
 475                         sizeof(priv->delta_stats));
 476                 memset(&priv->max_delta_stats, 0,
 477                         sizeof(priv->max_delta_stats));
 478 #endif
 479                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 480         }
 481
 482         iwlagn_rx_statistics(priv, rxb);
 483 }
 484
 485 /* Handle notification from uCode that card's power state is changing
 486  * due to software, hardware, or critical temperature RFKILL */
 487 static void iwlagn_rx_card_state_notif(struct iwl_priv *priv,
 488                                        struct iwl_rx_cmd_buffer *rxb)
 489 {
 490         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 491         struct iwl_card_state_notif *card_state_notif = (void *)pkt->data;
 492         u32 flags = le32_to_cpu(card_state_notif->flags);
 493         unsigned long status = priv->status;
 494
 495         IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
 496                           (flags & HW_CARD_DISABLED) ? "Kill" : "On",
 497                           (flags & SW_CARD_DISABLED) ? "Kill" : "On",
 498                           (flags & CT_CARD_DISABLED) ?
 499                           "Reached" : "Not reached");
 500
 501         if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
 502                      CT_CARD_DISABLED)) {
 503
 504                 iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_SET,
 505                             CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 506
 507                 iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C,
 508                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 509
 510                 if (!(flags & RXON_CARD_DISABLED)) {
 511                         iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_CLR,
 512                                     CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 513                         iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C,
 514                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 515                 }
 516                 if (flags & CT_CARD_DISABLED)
 517                         iwl_tt_enter_ct_kill(priv);
 518         }
 519         if (!(flags & CT_CARD_DISABLED))
 520                 iwl_tt_exit_ct_kill(priv);
 521
 522         if (flags & HW_CARD_DISABLED)
 523                 set_bit(STATUS_RF_KILL_HW, &priv->status);
 524         else
 525                 clear_bit(STATUS_RF_KILL_HW, &priv->status);
 526
 527
 528         if (!(flags & RXON_CARD_DISABLED))
 529                 iwl_scan_cancel(priv);
 530
 531         if ((test_bit(STATUS_RF_KILL_HW, &status) !=
 532              test_bit(STATUS_RF_KILL_HW, &priv->status)))
 533                 wiphy_rfkill_set_hw_state(priv->hw->wiphy,
 534                         test_bit(STATUS_RF_KILL_HW, &priv->status));
 535 }
 536
 537 static void iwlagn_rx_missed_beacon_notif(struct iwl_priv *priv,
 538                                           struct iwl_rx_cmd_buffer *rxb)
 539
 540 {
 541         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 542         struct iwl_missed_beacon_notif *missed_beacon = (void *)pkt->data;
 543
 544         if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
 545             priv->missed_beacon_threshold) {
 546                 IWL_DEBUG_CALIB(priv,
 547                     "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 548                     le32_to_cpu(missed_beacon->consecutive_missed_beacons),
 549                     le32_to_cpu(missed_beacon->total_missed_becons),
 550                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 551                     le32_to_cpu(missed_beacon->num_expected_beacons));
 552                 if (!test_bit(STATUS_SCANNING, &priv->status))
 553                         iwl_init_sensitivity(priv);
 554         }
 555 }
 556
 557 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
 558  * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
 559 static void iwlagn_rx_reply_rx_phy(struct iwl_priv *priv,
 560                                    struct iwl_rx_cmd_buffer *rxb)
 561 {
 562         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 563
 564         priv->last_phy_res_valid = true;
 565         priv->ampdu_ref++;
 566         memcpy(&priv->last_phy_res, pkt->data,
 567                sizeof(struct iwl_rx_phy_res));
 568 }
 569
 570 /*
 571  * returns non-zero if packet should be dropped
 572  */
 573 static int iwlagn_set_decrypted_flag(struct iwl_priv *priv,
 574                                   struct ieee80211_hdr *hdr,
 575                                   u32 decrypt_res,
 576                                   struct ieee80211_rx_status *stats)
 577 {
 578         u16 fc = le16_to_cpu(hdr->frame_control);
 579
 580         /*
 581          * All contexts have the same setting here due to it being
 582          * a module parameter, so OK to check any context.
 583          */
 584         if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags &
 585                                                 RXON_FILTER_DIS_DECRYPT_MSK)
 586                 return 0;
 587
 588         if (!(fc & IEEE80211_FCTL_PROTECTED))
 589                 return 0;
 590
 591         IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
 592         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 593         case RX_RES_STATUS_SEC_TYPE_TKIP:
 594                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 595                  * Decryption will be done in SW. */
 596                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 597                     RX_RES_STATUS_BAD_KEY_TTAK)
 598                         break;
 599
 600         case RX_RES_STATUS_SEC_TYPE_WEP:
 601                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 602                     RX_RES_STATUS_BAD_ICV_MIC) {
 603                         /* bad ICV, the packet is destroyed since the
 604                          * decryption is inplace, drop it */
 605                         IWL_DEBUG_RX(priv, "Packet destroyed\n");
 606                         return -1;
 607                 }
 608         case RX_RES_STATUS_SEC_TYPE_CCMP:
 609                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 610                     RX_RES_STATUS_DECRYPT_OK) {
 611                         IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
 612                         stats->flag |= RX_FLAG_DECRYPTED;
 613                 }
 614                 break;
 615
 616         default:
 617                 break;
 618         }
 619         return 0;
 620 }
 621
 622 static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv,
 623                                         struct ieee80211_hdr *hdr,
 624                                         u16 len,
 625                                         u32 ampdu_status,
 626                                         struct iwl_rx_cmd_buffer *rxb,
 627                                         struct ieee80211_rx_status *stats)
 628 {
 629         struct sk_buff *skb;
 630         __le16 fc = hdr->frame_control;
 631         struct iwl_rxon_context *ctx;
 632         unsigned int hdrlen, fraglen;
 633
 634         /* We only process data packets if the interface is open */
 635         if (unlikely(!priv->is_open)) {
 636                 IWL_DEBUG_DROP_LIMIT(priv,
 637                     "Dropping packet while interface is not open.\n");
 638                 return;
 639         }
 640
 641         /* In case of HW accelerated crypto and bad decryption, drop */
 642         if (!iwlwifi_mod_params.sw_crypto &&
 643             iwlagn_set_decrypted_flag(priv, hdr, ampdu_status, stats))
 644                 return;
 645
 646         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 647          * ieee80211_hdr pulled.
 648          */
 649         skb = alloc_skb(128, GFP_ATOMIC);
 650         if (!skb) {
 651                 IWL_ERR(priv, "alloc_skb failed\n");
 652                 return;
 653         }
 654         /* If frame is small enough to fit in skb->head, pull it completely.
 655          * If not, only pull ieee80211_hdr so that splice() or TCP coalesce
 656          * are more efficient.
 657          */
 658         hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr);
 659
 660         memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
 661         fraglen = len - hdrlen;
 662
 663         if (fraglen) {
 664                 int offset = (void *)hdr + hdrlen -
 665                              rxb_addr(rxb) + rxb_offset(rxb);
 666
 667                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 668                                 fraglen, rxb->truesize);
 669         }
 670
 671         /*
 672         * Wake any queues that were stopped due to a passive channel tx
 673         * failure. This can happen because the regulatory enforcement in
 674         * the device waits for a beacon before allowing transmission,
 675         * sometimes even after already having transmitted frames for the
 676         * association because the new RXON may reset the information.
 677         */
 678         if (unlikely(ieee80211_is_beacon(fc) && priv->passive_no_rx)) {
 679                 for_each_context(priv, ctx) {
 680                         if (!ether_addr_equal(hdr->addr3,
 681                                               ctx->active.bssid_addr))
 682                                 continue;
 683                         iwlagn_lift_passive_no_rx(priv);
 684                 }
 685         }
 686
 687         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
 688
 689         ieee80211_rx_napi(priv->hw, NULL, skb, priv->napi);
 690 }
 691
 692 static u32 iwlagn_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
 693 {
 694         u32 decrypt_out = 0;
 695
 696         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
 697                                         RX_RES_STATUS_STATION_FOUND)
 698                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
 699                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
 700
 701         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
 702
 703         /* packet was not encrypted */
 704         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 705                                         RX_RES_STATUS_SEC_TYPE_NONE)
 706                 return decrypt_out;
 707
 708         /* packet was encrypted with unknown alg */
 709         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 710                                         RX_RES_STATUS_SEC_TYPE_ERR)
 711                 return decrypt_out;
 712
 713         /* decryption was not done in HW */
 714         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
 715                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
 716                 return decrypt_out;
 717
 718         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
 719
 720         case RX_RES_STATUS_SEC_TYPE_CCMP:
 721                 /* alg is CCM: check MIC only */
 722                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
 723                         /* Bad MIC */
 724                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 725                 else
 726                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 727
 728                 break;
 729
 730         case RX_RES_STATUS_SEC_TYPE_TKIP:
 731                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
 732                         /* Bad TTAK */
 733                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
 734                         break;
 735                 }
 736                 /* fall through if TTAK OK */
 737         default:
 738                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
 739                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 740                 else
 741                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 742                 break;
 743         }
 744
 745         IWL_DEBUG_RX(priv, "decrypt_in:0x%x  decrypt_out = 0x%x\n",
 746                                         decrypt_in, decrypt_out);
 747
 748         return decrypt_out;
 749 }
 750
 751 /* Calc max signal level (dBm) among 3 possible receivers */
 752 static int iwlagn_calc_rssi(struct iwl_priv *priv,
 753                              struct iwl_rx_phy_res *rx_resp)
 754 {
 755         /* data from PHY/DSP regarding signal strength, etc.,
 756          *   contents are always there, not configurable by host
 757          */
 758         struct iwlagn_non_cfg_phy *ncphy =
 759                 (struct iwlagn_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
 760         u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
 761         u8 agc;
 762
 763         val  = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_AGC_IDX]);
 764         agc = (val & IWLAGN_OFDM_AGC_MSK) >> IWLAGN_OFDM_AGC_BIT_POS;
 765
 766         /* Find max rssi among 3 possible receivers.
 767          * These values are measured by the digital signal processor (DSP).
 768          * They should stay fairly constant even as the signal strength varies,
 769          *   if the radio's automatic gain control (AGC) is working right.
 770          * AGC value (see below) will provide the "interesting" info.
 771          */
 772         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_AB_IDX]);
 773         rssi_a = (val & IWLAGN_OFDM_RSSI_INBAND_A_BITMSK) >>
 774                 IWLAGN_OFDM_RSSI_A_BIT_POS;
 775         rssi_b = (val & IWLAGN_OFDM_RSSI_INBAND_B_BITMSK) >>
 776                 IWLAGN_OFDM_RSSI_B_BIT_POS;
 777         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_C_IDX]);
 778         rssi_c = (val & IWLAGN_OFDM_RSSI_INBAND_C_BITMSK) >>
 779                 IWLAGN_OFDM_RSSI_C_BIT_POS;
 780
 781         max_rssi = max_t(u32, rssi_a, rssi_b);
 782         max_rssi = max_t(u32, max_rssi, rssi_c);
 783
 784         IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
 785                 rssi_a, rssi_b, rssi_c, max_rssi, agc);
 786
 787         /* dBm = max_rssi dB - agc dB - constant.
 788          * Higher AGC (higher radio gain) means lower signal. */
 789         return max_rssi - agc - IWLAGN_RSSI_OFFSET;
 790 }
 791
 792 /* Called for REPLY_RX_MPDU_CMD */
 793 static void iwlagn_rx_reply_rx(struct iwl_priv *priv,
 794                                struct iwl_rx_cmd_buffer *rxb)
 795 {
 796         struct ieee80211_hdr *header;
 797         struct ieee80211_rx_status rx_status = {};
 798         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 799         struct iwl_rx_phy_res *phy_res;
 800         __le32 rx_pkt_status;
 801         struct iwl_rx_mpdu_res_start *amsdu;
 802         u32 len;
 803         u32 ampdu_status;
 804         u32 rate_n_flags;
 805
 806         if (!priv->last_phy_res_valid) {
 807                 IWL_ERR(priv, "MPDU frame without cached PHY data\n");
 808                 return;
 809         }
 810         phy_res = &priv->last_phy_res;
 811         amsdu = (struct iwl_rx_mpdu_res_start *)pkt->data;
 812         header = (struct ieee80211_hdr *)(pkt->data + sizeof(*amsdu));
 813         len = le16_to_cpu(amsdu->byte_count);
 814         rx_pkt_status = *(__le32 *)(pkt->data + sizeof(*amsdu) + len);
 815         ampdu_status = iwlagn_translate_rx_status(priv,
 816                                                   le32_to_cpu(rx_pkt_status));
 817
 818         if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
 819                 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d\n",
 820                                 phy_res->cfg_phy_cnt);
 821                 return;
 822         }
 823
 824         if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
 825             !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
 826                 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
 827                                 le32_to_cpu(rx_pkt_status));
 828                 return;
 829         }
 830
 831         /* This will be used in several places later */
 832         rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
 833
 834         /* rx_status carries information about the packet to mac80211 */
 835         rx_status.mactime = le64_to_cpu(phy_res->timestamp);
 836         rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
 837                                 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 838         rx_status.freq =
 839                 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel),
 840                                                rx_status.band);
 841         rx_status.rate_idx =
 842                 iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
 843         rx_status.flag = 0;
 844
 845         /* TSF isn't reliable. In order to allow smooth user experience,
 846          * this W/A doesn't propagate it to the mac80211 */
 847         /*rx_status.flag |= RX_FLAG_MACTIME_START;*/
 848
 849         priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
 850
 851         /* Find max signal strength (dBm) among 3 antenna/receiver chains */
 852         rx_status.signal = iwlagn_calc_rssi(priv, phy_res);
 853
 854         IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n",
 855                 rx_status.signal, (unsigned long long)rx_status.mactime);
 856
 857         /*
 858          * "antenna number"
 859          *
 860          * It seems that the antenna field in the phy flags value
 861          * is actually a bit field. This is undefined by radiotap,
 862          * it wants an actual antenna number but I always get "7"
 863          * for most legacy frames I receive indicating that the
 864          * same frame was received on all three RX chains.
 865          *
 866          * I think this field should be removed in favor of a
 867          * new 802.11n radiotap field "RX chains" that is defined
 868          * as a bitmask.
 869          */
 870         rx_status.antenna =
 871                 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
 872                 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 873
 874         /* set the preamble flag if appropriate */
 875         if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
 876                 rx_status.flag |= RX_FLAG_SHORTPRE;
 877
 878         if (phy_res->phy_flags & RX_RES_PHY_FLAGS_AGG_MSK) {
 879                 /*
 880                  * We know which subframes of an A-MPDU belong
 881                  * together since we get a single PHY response
 882                  * from the firmware for all of them
 883                  */
 884                 rx_status.flag |= RX_FLAG_AMPDU_DETAILS;
 885                 rx_status.ampdu_reference = priv->ampdu_ref;
 886         }
 887
 888         /* Set up the HT phy flags */
 889         if (rate_n_flags & RATE_MCS_HT_MSK)
 890                 rx_status.flag |= RX_FLAG_HT;
 891         if (rate_n_flags & RATE_MCS_HT40_MSK)
 892                 rx_status.flag |= RX_FLAG_40MHZ;
 893         if (rate_n_flags & RATE_MCS_SGI_MSK)
 894                 rx_status.flag |= RX_FLAG_SHORT_GI;
 895         if (rate_n_flags & RATE_MCS_GF_MSK)
 896                 rx_status.flag |= RX_FLAG_HT_GF;
 897
 898         iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status,
 899                                     rxb, &rx_status);
 900 }
 901
 902 static void iwlagn_rx_noa_notification(struct iwl_priv *priv,
 903                                        struct iwl_rx_cmd_buffer *rxb)
 904 {
 905         struct iwl_wipan_noa_data *new_data, *old_data;
 906         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 907         struct iwl_wipan_noa_notification *noa_notif = (void *)pkt->data;
 908
 909         /* no condition -- we're in softirq */
 910         old_data = rcu_dereference_protected(priv->noa_data, true);
 911
 912         if (noa_notif->noa_active) {
 913                 u32 len = le16_to_cpu(noa_notif->noa_attribute.length);
 914                 u32 copylen = len;
 915
 916                 /* EID, len, OUI, subtype */
 917                 len += 1 + 1 + 3 + 1;
 918                 /* P2P id, P2P length */
 919                 len += 1 + 2;
 920                 copylen += 1 + 2;
 921
 922                 new_data = kmalloc(sizeof(*new_data) + len, GFP_ATOMIC);
 923                 if (new_data) {
 924                         new_data->length = len;
 925                         new_data->data[0] = WLAN_EID_VENDOR_SPECIFIC;
 926                         new_data->data[1] = len - 2; /* not counting EID, len */
 927                         new_data->data[2] = (WLAN_OUI_WFA >> 16) & 0xff;
 928                         new_data->data[3] = (WLAN_OUI_WFA >> 8) & 0xff;
 929                         new_data->data[4] = (WLAN_OUI_WFA >> 0) & 0xff;
 930                         new_data->data[5] = WLAN_OUI_TYPE_WFA_P2P;
 931                         memcpy(&new_data->data[6], &noa_notif->noa_attribute,
 932                                copylen);
 933                 }
 934         } else
 935                 new_data = NULL;
 936
 937         rcu_assign_pointer(priv->noa_data, new_data);
 938
 939         if (old_data)
 940                 kfree_rcu(old_data, rcu_head);
 941 }
 942
 943 /**
 944  * iwl_setup_rx_handlers - Initialize Rx handler callbacks
 945  *
 946  * Setup the RX handlers for each of the reply types sent from the uCode
 947  * to the host.
 948  */
 949 void iwl_setup_rx_handlers(struct iwl_priv *priv)
 950 {
 951         void (**handlers)(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb);
 952
 953         handlers = priv->rx_handlers;
 954
 955         handlers[REPLY_ERROR]                   = iwlagn_rx_reply_error;
 956         handlers[CHANNEL_SWITCH_NOTIFICATION]   = iwlagn_rx_csa;
 957         handlers[SPECTRUM_MEASURE_NOTIFICATION] =
 958                 iwlagn_rx_spectrum_measure_notif;
 959         handlers[PM_SLEEP_NOTIFICATION]         = iwlagn_rx_pm_sleep_notif;
 960         handlers[PM_DEBUG_STATISTIC_NOTIFIC]    =
 961                 iwlagn_rx_pm_debug_statistics_notif;
 962         handlers[BEACON_NOTIFICATION]           = iwlagn_rx_beacon_notif;
 963         handlers[REPLY_ADD_STA]                 = iwl_add_sta_callback;
 964
 965         handlers[REPLY_WIPAN_NOA_NOTIFICATION]  = iwlagn_rx_noa_notification;
 966
 967         /*
 968          * The same handler is used for both the REPLY to a discrete
 969          * statistics request from the host as well as for the periodic
 970          * statistics notifications (after received beacons) from the uCode.
 971          */
 972         handlers[REPLY_STATISTICS_CMD]          = iwlagn_rx_reply_statistics;
 973         handlers[STATISTICS_NOTIFICATION]       = iwlagn_rx_statistics;
 974
 975         iwl_setup_rx_scan_handlers(priv);
 976
 977         handlers[CARD_STATE_NOTIFICATION]       = iwlagn_rx_card_state_notif;
 978         handlers[MISSED_BEACONS_NOTIFICATION]   =
 979                 iwlagn_rx_missed_beacon_notif;
 980
 981         /* Rx handlers */
 982         handlers[REPLY_RX_PHY_CMD]              = iwlagn_rx_reply_rx_phy;
 983         handlers[REPLY_RX_MPDU_CMD]             = iwlagn_rx_reply_rx;
 984
 985         /* block ack */
 986         handlers[REPLY_COMPRESSED_BA]           =
 987                 iwlagn_rx_reply_compressed_ba;
 988
 989         priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx;
 990
 991         /* set up notification wait support */
 992         iwl_notification_wait_init(&priv->notif_wait);
 993
 994         /* Set up BT Rx handlers */
 995         if (priv->lib->bt_params)
 996                 iwlagn_bt_rx_handler_setup(priv);
 997 }
 998
 999 void iwl_rx_dispatch(struct iwl_op_mode *op_mode, struct napi_struct *napi,
1000                      struct iwl_rx_cmd_buffer *rxb)
1001 {
1002         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1003         struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
1004
1005         /*
1006          * Do the notification wait before RX handlers so
1007          * even if the RX handler consumes the RXB we have
1008          * access to it in the notification wait entry.
1009          */
1010         iwl_notification_wait_notify(&priv->notif_wait, pkt);
1011
1012         /* Based on type of command response or notification,
1013          *   handle those that need handling via function in
1014          *   rx_handlers table.  See iwl_setup_rx_handlers() */
1015         if (priv->rx_handlers[pkt->hdr.cmd]) {
1016                 priv->rx_handlers_stats[pkt->hdr.cmd]++;
1017                 priv->rx_handlers[pkt->hdr.cmd](priv, rxb);
1018         } else {
1019                 /* No handling needed */
1020                 IWL_DEBUG_RX(priv, "No handler needed for %s, 0x%02x\n",
1021                              iwl_get_cmd_string(priv->trans,
1022                                                 iwl_cmd_id(pkt->hdr.cmd,
1023                                                            0, 0)),
1024                              pkt->hdr.cmd);
1025         }
1026 }