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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3  *
   4  * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
   5  * Copyright(c) 2015 Intel Deutschland GmbH
   6  * Copyright(c) 2018 Intel Corporation
   7  *
   8  * Portions of this file are derived from the ipw3945 project, as well
   9  * as portionhelp of the ieee80211 subsystem header files.
  10  *
  11  * Contact Information:
  12  *  Intel Linux Wireless <linuxwifi@intel.com>
  13  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  14  *
  15  *****************************************************************************/
  16
  17 #include <linux/etherdevice.h>
  18 #include <linux/slab.h>
  19 #include <linux/sched.h>
  20 #include <net/mac80211.h>
  21 #include <asm/unaligned.h>
  22
  23 #include "iwl-trans.h"
  24 #include "iwl-io.h"
  25 #include "dev.h"
  26 #include "calib.h"
  27 #include "agn.h"
  28
  29 /******************************************************************************
  30  *
  31  * Generic RX handler implementations
  32  *
  33  ******************************************************************************/
  34
  35 static void iwlagn_rx_reply_error(struct iwl_priv *priv,
  36                                   struct iwl_rx_cmd_buffer *rxb)
  37 {
  38         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  39         struct iwl_error_resp *err_resp = (void *)pkt->data;
  40
  41         IWL_ERR(priv, "Error Reply type 0x%08X cmd REPLY_ERROR (0x%02X) "
  42                 "seq 0x%04X ser 0x%08X\n",
  43                 le32_to_cpu(err_resp->error_type),
  44                 err_resp->cmd_id,
  45                 le16_to_cpu(err_resp->bad_cmd_seq_num),
  46                 le32_to_cpu(err_resp->error_info));
  47 }
  48
  49 static void iwlagn_rx_csa(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb)
  50 {
  51         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  52         struct iwl_csa_notification *csa = (void *)pkt->data;
  53         /*
  54          * MULTI-FIXME
  55          * See iwlagn_mac_channel_switch.
  56          */
  57         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
  58         struct iwl_rxon_cmd *rxon = (void *)&ctx->active;
  59
  60         if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status))
  61                 return;
  62
  63         if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) {
  64                 rxon->channel = csa->channel;
  65                 ctx->staging.channel = csa->channel;
  66                 IWL_DEBUG_11H(priv, "CSA notif: channel %d\n",
  67                               le16_to_cpu(csa->channel));
  68                 iwl_chswitch_done(priv, true);
  69         } else {
  70                 IWL_ERR(priv, "CSA notif (fail) : channel %d\n",
  71                         le16_to_cpu(csa->channel));
  72                 iwl_chswitch_done(priv, false);
  73         }
  74 }
  75
  76
  77 static void iwlagn_rx_spectrum_measure_notif(struct iwl_priv *priv,
  78                                              struct iwl_rx_cmd_buffer *rxb)
  79 {
  80         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  81         struct iwl_spectrum_notification *report = (void *)pkt->data;
  82
  83         if (!report->state) {
  84                 IWL_DEBUG_11H(priv,
  85                         "Spectrum Measure Notification: Start\n");
  86                 return;
  87         }
  88
  89         memcpy(&priv->measure_report, report, sizeof(*report));
  90         priv->measurement_status |= MEASUREMENT_READY;
  91 }
  92
  93 static void iwlagn_rx_pm_sleep_notif(struct iwl_priv *priv,
  94                                      struct iwl_rx_cmd_buffer *rxb)
  95 {
  96 #ifdef CONFIG_IWLWIFI_DEBUG
  97         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  98         struct iwl_sleep_notification *sleep = (void *)pkt->data;
  99         IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n",
 100                      sleep->pm_sleep_mode, sleep->pm_wakeup_src);
 101 #endif
 102 }
 103
 104 static void iwlagn_rx_pm_debug_statistics_notif(struct iwl_priv *priv,
 105                                                 struct iwl_rx_cmd_buffer *rxb)
 106 {
 107         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 108         u32 __maybe_unused len = iwl_rx_packet_len(pkt);
 109         IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled "
 110                         "notification for PM_DEBUG_STATISTIC_NOTIFIC:\n", len);
 111         iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->data, len);
 112 }
 113
 114 static void iwlagn_rx_beacon_notif(struct iwl_priv *priv,
 115                                    struct iwl_rx_cmd_buffer *rxb)
 116 {
 117         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 118         struct iwlagn_beacon_notif *beacon = (void *)pkt->data;
 119 #ifdef CONFIG_IWLWIFI_DEBUG
 120         u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status);
 121         u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);
 122
 123         IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d "
 124                 "tsf:0x%.8x%.8x rate:%d\n",
 125                 status & TX_STATUS_MSK,
 126                 beacon->beacon_notify_hdr.failure_frame,
 127                 le32_to_cpu(beacon->ibss_mgr_status),
 128                 le32_to_cpu(beacon->high_tsf),
 129                 le32_to_cpu(beacon->low_tsf), rate);
 130 #endif
 131
 132         priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);
 133 }
 134
 135 /**
 136  * iwl_good_plcp_health - checks for plcp error.
 137  *
 138  * When the plcp error is exceeding the thresholds, reset the radio
 139  * to improve the throughput.
 140  */
 141 static bool iwlagn_good_plcp_health(struct iwl_priv *priv,
 142                                  struct statistics_rx_phy *cur_ofdm,
 143                                  struct statistics_rx_ht_phy *cur_ofdm_ht,
 144                                  unsigned int msecs)
 145 {
 146         int delta;
 147         int threshold = priv->plcp_delta_threshold;
 148
 149         if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
 150                 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
 151                 return true;
 152         }
 153
 154         delta = le32_to_cpu(cur_ofdm->plcp_err) -
 155                 le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) +
 156                 le32_to_cpu(cur_ofdm_ht->plcp_err) -
 157                 le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err);
 158
 159         /* Can be negative if firmware reset statistics */
 160         if (delta <= 0)
 161                 return true;
 162
 163         if ((delta * 100 / msecs) > threshold) {
 164                 IWL_DEBUG_RADIO(priv,
 165                                 "plcp health threshold %u delta %d msecs %u\n",
 166                                 threshold, delta, msecs);
 167                 return false;
 168         }
 169
 170         return true;
 171 }
 172
 173 int iwl_force_rf_reset(struct iwl_priv *priv, bool external)
 174 {
 175         struct iwl_rf_reset *rf_reset;
 176
 177         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 178                 return -EAGAIN;
 179
 180         if (!iwl_is_any_associated(priv)) {
 181                 IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n");
 182                 return -ENOLINK;
 183         }
 184
 185         rf_reset = &priv->rf_reset;
 186         rf_reset->reset_request_count++;
 187         if (!external && rf_reset->last_reset_jiffies &&
 188             time_after(rf_reset->last_reset_jiffies +
 189                        IWL_DELAY_NEXT_FORCE_RF_RESET, jiffies)) {
 190                 IWL_DEBUG_INFO(priv, "RF reset rejected\n");
 191                 rf_reset->reset_reject_count++;
 192                 return -EAGAIN;
 193         }
 194         rf_reset->reset_success_count++;
 195         rf_reset->last_reset_jiffies = jiffies;
 196
 197         /*
 198          * There is no easy and better way to force reset the radio,
 199          * the only known method is switching channel which will force to
 200          * reset and tune the radio.
 201          * Use internal short scan (single channel) operation to should
 202          * achieve this objective.
 203          * Driver should reset the radio when number of consecutive missed
 204          * beacon, or any other uCode error condition detected.
 205          */
 206         IWL_DEBUG_INFO(priv, "perform radio reset.\n");
 207         iwl_internal_short_hw_scan(priv);
 208         return 0;
 209 }
 210
 211
 212 static void iwlagn_recover_from_statistics(struct iwl_priv *priv,
 213                                 struct statistics_rx_phy *cur_ofdm,
 214                                 struct statistics_rx_ht_phy *cur_ofdm_ht,
 215                                 struct statistics_tx *tx,
 216                                 unsigned long stamp)
 217 {
 218         unsigned int msecs;
 219
 220         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 221                 return;
 222
 223         msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies);
 224
 225         /* Only gather statistics and update time stamp when not associated */
 226         if (!iwl_is_any_associated(priv))
 227                 return;
 228
 229         /* Do not check/recover when do not have enough statistics data */
 230         if (msecs < 99)
 231                 return;
 232
 233         if (!iwlagn_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs))
 234                 iwl_force_rf_reset(priv, false);
 235 }
 236
 237 /* Calculate noise level, based on measurements during network silence just
 238  *   before arriving beacon.  This measurement can be done only if we know
 239  *   exactly when to expect beacons, therefore only when we're associated. */
 240 static void iwlagn_rx_calc_noise(struct iwl_priv *priv)
 241 {
 242         struct statistics_rx_non_phy *rx_info;
 243         int num_active_rx = 0;
 244         int total_silence = 0;
 245         int bcn_silence_a, bcn_silence_b, bcn_silence_c;
 246         int last_rx_noise;
 247
 248         rx_info = &priv->statistics.rx_non_phy;
 249
 250         bcn_silence_a =
 251                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 252         bcn_silence_b =
 253                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 254         bcn_silence_c =
 255                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 256
 257         if (bcn_silence_a) {
 258                 total_silence += bcn_silence_a;
 259                 num_active_rx++;
 260         }
 261         if (bcn_silence_b) {
 262                 total_silence += bcn_silence_b;
 263                 num_active_rx++;
 264         }
 265         if (bcn_silence_c) {
 266                 total_silence += bcn_silence_c;
 267                 num_active_rx++;
 268         }
 269
 270         /* Average among active antennas */
 271         if (num_active_rx)
 272                 last_rx_noise = (total_silence / num_active_rx) - 107;
 273         else
 274                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 275
 276         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 277                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 278                         last_rx_noise);
 279 }
 280
 281 #ifdef CONFIG_IWLWIFI_DEBUGFS
 282 /*
 283  *  based on the assumption of all statistics counter are in DWORD
 284  *  FIXME: This function is for debugging, do not deal with
 285  *  the case of counters roll-over.
 286  */
 287 static void accum_stats(__le32 *prev, __le32 *cur, __le32 *delta,
 288                         __le32 *max_delta, __le32 *accum, int size)
 289 {
 290         int i;
 291
 292         for (i = 0;
 293              i < size / sizeof(__le32);
 294              i++, prev++, cur++, delta++, max_delta++, accum++) {
 295                 if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) {
 296                         *delta = cpu_to_le32(
 297                                 le32_to_cpu(*cur) - le32_to_cpu(*prev));
 298                         le32_add_cpu(accum, le32_to_cpu(*delta));
 299                         if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta))
 300                                 *max_delta = *delta;
 301                 }
 302         }
 303 }
 304
 305 static void
 306 iwlagn_accumulative_statistics(struct iwl_priv *priv,
 307                             struct statistics_general_common *common,
 308                             struct statistics_rx_non_phy *rx_non_phy,
 309                             struct statistics_rx_phy *rx_ofdm,
 310                             struct statistics_rx_ht_phy *rx_ofdm_ht,
 311                             struct statistics_rx_phy *rx_cck,
 312                             struct statistics_tx *tx,
 313                             struct statistics_bt_activity *bt_activity)
 314 {
 315 #define ACCUM(_name)    \
 316         accum_stats((__le32 *)&priv->statistics._name,          \
 317                     (__le32 *)_name,                            \
 318                     (__le32 *)&priv->delta_stats._name,         \
 319                     (__le32 *)&priv->max_delta_stats._name,     \
 320                     (__le32 *)&priv->accum_stats._name,         \
 321                     sizeof(*_name));
 322
 323         ACCUM(common);
 324         ACCUM(rx_non_phy);
 325         ACCUM(rx_ofdm);
 326         ACCUM(rx_ofdm_ht);
 327         ACCUM(rx_cck);
 328         ACCUM(tx);
 329         if (bt_activity)
 330                 ACCUM(bt_activity);
 331 #undef ACCUM
 332 }
 333 #else
 334 static inline void
 335 iwlagn_accumulative_statistics(struct iwl_priv *priv,
 336                             struct statistics_general_common *common,
 337                             struct statistics_rx_non_phy *rx_non_phy,
 338                             struct statistics_rx_phy *rx_ofdm,
 339                             struct statistics_rx_ht_phy *rx_ofdm_ht,
 340                             struct statistics_rx_phy *rx_cck,
 341                             struct statistics_tx *tx,
 342                             struct statistics_bt_activity *bt_activity)
 343 {
 344 }
 345 #endif
 346
 347 static void iwlagn_rx_statistics(struct iwl_priv *priv,
 348                                  struct iwl_rx_cmd_buffer *rxb)
 349 {
 350         unsigned long stamp = jiffies;
 351         const int reg_recalib_period = 60;
 352         int change;
 353         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 354         u32 len = iwl_rx_packet_payload_len(pkt);
 355         __le32 *flag;
 356         struct statistics_general_common *common;
 357         struct statistics_rx_non_phy *rx_non_phy;
 358         struct statistics_rx_phy *rx_ofdm;
 359         struct statistics_rx_ht_phy *rx_ofdm_ht;
 360         struct statistics_rx_phy *rx_cck;
 361         struct statistics_tx *tx;
 362         struct statistics_bt_activity *bt_activity;
 363
 364         IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n",
 365                      len);
 366
 367         spin_lock(&priv->statistics.lock);
 368
 369         if (len == sizeof(struct iwl_bt_notif_statistics)) {
 370                 struct iwl_bt_notif_statistics *stats;
 371                 stats = (void *)&pkt->data;
 372                 flag = &stats->flag;
 373                 common = &stats->general.common;
 374                 rx_non_phy = &stats->rx.general.common;
 375                 rx_ofdm = &stats->rx.ofdm;
 376                 rx_ofdm_ht = &stats->rx.ofdm_ht;
 377                 rx_cck = &stats->rx.cck;
 378                 tx = &stats->tx;
 379                 bt_activity = &stats->general.activity;
 380
 381 #ifdef CONFIG_IWLWIFI_DEBUGFS
 382                 /* handle this exception directly */
 383                 priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills;
 384                 le32_add_cpu(&priv->statistics.accum_num_bt_kills,
 385                              le32_to_cpu(stats->rx.general.num_bt_kills));
 386 #endif
 387         } else if (len == sizeof(struct iwl_notif_statistics)) {
 388                 struct iwl_notif_statistics *stats;
 389                 stats = (void *)&pkt->data;
 390                 flag = &stats->flag;
 391                 common = &stats->general.common;
 392                 rx_non_phy = &stats->rx.general;
 393                 rx_ofdm = &stats->rx.ofdm;
 394                 rx_ofdm_ht = &stats->rx.ofdm_ht;
 395                 rx_cck = &stats->rx.cck;
 396                 tx = &stats->tx;
 397                 bt_activity = NULL;
 398         } else {
 399                 WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n",
 400                           len, sizeof(struct iwl_bt_notif_statistics),
 401                           sizeof(struct iwl_notif_statistics));
 402                 spin_unlock(&priv->statistics.lock);
 403                 return;
 404         }
 405
 406         change = common->temperature != priv->statistics.common.temperature ||
 407                  (*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 408                  (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK);
 409
 410         iwlagn_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm,
 411                                     rx_ofdm_ht, rx_cck, tx, bt_activity);
 412
 413         iwlagn_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp);
 414
 415         priv->statistics.flag = *flag;
 416         memcpy(&priv->statistics.common, common, sizeof(*common));
 417         memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy));
 418         memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm));
 419         memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht));
 420         memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck));
 421         memcpy(&priv->statistics.tx, tx, sizeof(*tx));
 422 #ifdef CONFIG_IWLWIFI_DEBUGFS
 423         if (bt_activity)
 424                 memcpy(&priv->statistics.bt_activity, bt_activity,
 425                         sizeof(*bt_activity));
 426 #endif
 427
 428         priv->rx_statistics_jiffies = stamp;
 429
 430         set_bit(STATUS_STATISTICS, &priv->status);
 431
 432         /* Reschedule the statistics timer to occur in
 433          * reg_recalib_period seconds to ensure we get a
 434          * thermal update even if the uCode doesn't give
 435          * us one */
 436         mod_timer(&priv->statistics_periodic, jiffies +
 437                   msecs_to_jiffies(reg_recalib_period * 1000));
 438
 439         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 440             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 441                 iwlagn_rx_calc_noise(priv);
 442                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 443         }
 444         if (priv->lib->temperature && change)
 445                 priv->lib->temperature(priv);
 446
 447         spin_unlock(&priv->statistics.lock);
 448 }
 449
 450 static void iwlagn_rx_reply_statistics(struct iwl_priv *priv,
 451                                        struct iwl_rx_cmd_buffer *rxb)
 452 {
 453         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 454         struct iwl_notif_statistics *stats = (void *)pkt->data;
 455
 456         if (le32_to_cpu(stats->flag) & UCODE_STATISTICS_CLEAR_MSK) {
 457 #ifdef CONFIG_IWLWIFI_DEBUGFS
 458                 memset(&priv->accum_stats, 0,
 459                         sizeof(priv->accum_stats));
 460                 memset(&priv->delta_stats, 0,
 461                         sizeof(priv->delta_stats));
 462                 memset(&priv->max_delta_stats, 0,
 463                         sizeof(priv->max_delta_stats));
 464 #endif
 465                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 466         }
 467
 468         iwlagn_rx_statistics(priv, rxb);
 469 }
 470
 471 /* Handle notification from uCode that card's power state is changing
 472  * due to software, hardware, or critical temperature RFKILL */
 473 static void iwlagn_rx_card_state_notif(struct iwl_priv *priv,
 474                                        struct iwl_rx_cmd_buffer *rxb)
 475 {
 476         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 477         struct iwl_card_state_notif *card_state_notif = (void *)pkt->data;
 478         u32 flags = le32_to_cpu(card_state_notif->flags);
 479         unsigned long status = priv->status;
 480
 481         IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
 482                           (flags & HW_CARD_DISABLED) ? "Kill" : "On",
 483                           (flags & SW_CARD_DISABLED) ? "Kill" : "On",
 484                           (flags & CT_CARD_DISABLED) ?
 485                           "Reached" : "Not reached");
 486
 487         if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
 488                      CT_CARD_DISABLED)) {
 489
 490                 iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_SET,
 491                             CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 492
 493                 iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C,
 494                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 495
 496                 if (!(flags & RXON_CARD_DISABLED)) {
 497                         iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_CLR,
 498                                     CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 499                         iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C,
 500                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 501                 }
 502                 if (flags & CT_CARD_DISABLED)
 503                         iwl_tt_enter_ct_kill(priv);
 504         }
 505         if (!(flags & CT_CARD_DISABLED))
 506                 iwl_tt_exit_ct_kill(priv);
 507
 508         if (flags & HW_CARD_DISABLED)
 509                 set_bit(STATUS_RF_KILL_HW, &priv->status);
 510         else
 511                 clear_bit(STATUS_RF_KILL_HW, &priv->status);
 512
 513
 514         if (!(flags & RXON_CARD_DISABLED))
 515                 iwl_scan_cancel(priv);
 516
 517         if ((test_bit(STATUS_RF_KILL_HW, &status) !=
 518              test_bit(STATUS_RF_KILL_HW, &priv->status)))
 519                 wiphy_rfkill_set_hw_state(priv->hw->wiphy,
 520                         test_bit(STATUS_RF_KILL_HW, &priv->status));
 521 }
 522
 523 static void iwlagn_rx_missed_beacon_notif(struct iwl_priv *priv,
 524                                           struct iwl_rx_cmd_buffer *rxb)
 525
 526 {
 527         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 528         struct iwl_missed_beacon_notif *missed_beacon = (void *)pkt->data;
 529
 530         if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
 531             priv->missed_beacon_threshold) {
 532                 IWL_DEBUG_CALIB(priv,
 533                     "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 534                     le32_to_cpu(missed_beacon->consecutive_missed_beacons),
 535                     le32_to_cpu(missed_beacon->total_missed_becons),
 536                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 537                     le32_to_cpu(missed_beacon->num_expected_beacons));
 538                 if (!test_bit(STATUS_SCANNING, &priv->status))
 539                         iwl_init_sensitivity(priv);
 540         }
 541 }
 542
 543 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
 544  * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
 545 static void iwlagn_rx_reply_rx_phy(struct iwl_priv *priv,
 546                                    struct iwl_rx_cmd_buffer *rxb)
 547 {
 548         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 549
 550         priv->last_phy_res_valid = true;
 551         priv->ampdu_ref++;
 552         memcpy(&priv->last_phy_res, pkt->data,
 553                sizeof(struct iwl_rx_phy_res));
 554 }
 555
 556 /*
 557  * returns non-zero if packet should be dropped
 558  */
 559 static int iwlagn_set_decrypted_flag(struct iwl_priv *priv,
 560                                   struct ieee80211_hdr *hdr,
 561                                   u32 decrypt_res,
 562                                   struct ieee80211_rx_status *stats)
 563 {
 564         u16 fc = le16_to_cpu(hdr->frame_control);
 565
 566         /*
 567          * All contexts have the same setting here due to it being
 568          * a module parameter, so OK to check any context.
 569          */
 570         if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags &
 571                                                 RXON_FILTER_DIS_DECRYPT_MSK)
 572                 return 0;
 573
 574         if (!(fc & IEEE80211_FCTL_PROTECTED))
 575                 return 0;
 576
 577         IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
 578         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 579         case RX_RES_STATUS_SEC_TYPE_TKIP:
 580                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 581                  * Decryption will be done in SW. */
 582                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 583                     RX_RES_STATUS_BAD_KEY_TTAK)
 584                         break;
 585                 /* fall through */
 586         case RX_RES_STATUS_SEC_TYPE_WEP:
 587                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 588                     RX_RES_STATUS_BAD_ICV_MIC) {
 589                         /* bad ICV, the packet is destroyed since the
 590                          * decryption is inplace, drop it */
 591                         IWL_DEBUG_RX(priv, "Packet destroyed\n");
 592                         return -1;
 593                 }
 594                 /* fall through */
 595         case RX_RES_STATUS_SEC_TYPE_CCMP:
 596                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 597                     RX_RES_STATUS_DECRYPT_OK) {
 598                         IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
 599                         stats->flag |= RX_FLAG_DECRYPTED;
 600                 }
 601                 break;
 602
 603         default:
 604                 break;
 605         }
 606         return 0;
 607 }
 608
 609 static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv,
 610                                         struct ieee80211_hdr *hdr,
 611                                         u16 len,
 612                                         u32 ampdu_status,
 613                                         struct iwl_rx_cmd_buffer *rxb,
 614                                         struct ieee80211_rx_status *stats)
 615 {
 616         struct sk_buff *skb;
 617         __le16 fc = hdr->frame_control;
 618         struct iwl_rxon_context *ctx;
 619         unsigned int hdrlen, fraglen;
 620
 621         /* We only process data packets if the interface is open */
 622         if (unlikely(!priv->is_open)) {
 623                 IWL_DEBUG_DROP_LIMIT(priv,
 624                     "Dropping packet while interface is not open.\n");
 625                 return;
 626         }
 627
 628         /* In case of HW accelerated crypto and bad decryption, drop */
 629         if (!iwlwifi_mod_params.swcrypto &&
 630             iwlagn_set_decrypted_flag(priv, hdr, ampdu_status, stats))
 631                 return;
 632
 633         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 634          * ieee80211_hdr pulled.
 635          */
 636         skb = alloc_skb(128, GFP_ATOMIC);
 637         if (!skb) {
 638                 IWL_ERR(priv, "alloc_skb failed\n");
 639                 return;
 640         }
 641         /* If frame is small enough to fit in skb->head, pull it completely.
 642          * If not, only pull ieee80211_hdr so that splice() or TCP coalesce
 643          * are more efficient.
 644          */
 645         hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr);
 646
 647         skb_put_data(skb, hdr, hdrlen);
 648         fraglen = len - hdrlen;
 649
 650         if (fraglen) {
 651                 int offset = (void *)hdr + hdrlen -
 652                              rxb_addr(rxb) + rxb_offset(rxb);
 653
 654                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 655                                 fraglen, rxb->truesize);
 656         }
 657
 658         /*
 659         * Wake any queues that were stopped due to a passive channel tx
 660         * failure. This can happen because the regulatory enforcement in
 661         * the device waits for a beacon before allowing transmission,
 662         * sometimes even after already having transmitted frames for the
 663         * association because the new RXON may reset the information.
 664         */
 665         if (unlikely(ieee80211_is_beacon(fc) && priv->passive_no_rx)) {
 666                 for_each_context(priv, ctx) {
 667                         if (!ether_addr_equal(hdr->addr3,
 668                                               ctx->active.bssid_addr))
 669                                 continue;
 670                         iwlagn_lift_passive_no_rx(priv);
 671                 }
 672         }
 673
 674         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
 675
 676         ieee80211_rx_napi(priv->hw, NULL, skb, priv->napi);
 677 }
 678
 679 static u32 iwlagn_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
 680 {
 681         u32 decrypt_out = 0;
 682
 683         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
 684                                         RX_RES_STATUS_STATION_FOUND)
 685                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
 686                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
 687
 688         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
 689
 690         /* packet was not encrypted */
 691         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 692                                         RX_RES_STATUS_SEC_TYPE_NONE)
 693                 return decrypt_out;
 694
 695         /* packet was encrypted with unknown alg */
 696         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 697                                         RX_RES_STATUS_SEC_TYPE_ERR)
 698                 return decrypt_out;
 699
 700         /* decryption was not done in HW */
 701         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
 702                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
 703                 return decrypt_out;
 704
 705         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
 706
 707         case RX_RES_STATUS_SEC_TYPE_CCMP:
 708                 /* alg is CCM: check MIC only */
 709                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
 710                         /* Bad MIC */
 711                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 712                 else
 713                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 714
 715                 break;
 716
 717         case RX_RES_STATUS_SEC_TYPE_TKIP:
 718                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
 719                         /* Bad TTAK */
 720                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
 721                         break;
 722                 }
 723                 /* fall through */
 724         default:
 725                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
 726                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 727                 else
 728                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 729                 break;
 730         }
 731
 732         IWL_DEBUG_RX(priv, "decrypt_in:0x%x  decrypt_out = 0x%x\n",
 733                                         decrypt_in, decrypt_out);
 734
 735         return decrypt_out;
 736 }
 737
 738 /* Calc max signal level (dBm) among 3 possible receivers */
 739 static int iwlagn_calc_rssi(struct iwl_priv *priv,
 740                              struct iwl_rx_phy_res *rx_resp)
 741 {
 742         /* data from PHY/DSP regarding signal strength, etc.,
 743          *   contents are always there, not configurable by host
 744          */
 745         struct iwlagn_non_cfg_phy *ncphy =
 746                 (struct iwlagn_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
 747         u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
 748         u8 agc;
 749
 750         val  = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_AGC_IDX]);
 751         agc = (val & IWLAGN_OFDM_AGC_MSK) >> IWLAGN_OFDM_AGC_BIT_POS;
 752
 753         /* Find max rssi among 3 possible receivers.
 754          * These values are measured by the digital signal processor (DSP).
 755          * They should stay fairly constant even as the signal strength varies,
 756          *   if the radio's automatic gain control (AGC) is working right.
 757          * AGC value (see below) will provide the "interesting" info.
 758          */
 759         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_AB_IDX]);
 760         rssi_a = (val & IWLAGN_OFDM_RSSI_INBAND_A_BITMSK) >>
 761                 IWLAGN_OFDM_RSSI_A_BIT_POS;
 762         rssi_b = (val & IWLAGN_OFDM_RSSI_INBAND_B_BITMSK) >>
 763                 IWLAGN_OFDM_RSSI_B_BIT_POS;
 764         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_C_IDX]);
 765         rssi_c = (val & IWLAGN_OFDM_RSSI_INBAND_C_BITMSK) >>
 766                 IWLAGN_OFDM_RSSI_C_BIT_POS;
 767
 768         max_rssi = max_t(u32, rssi_a, rssi_b);
 769         max_rssi = max_t(u32, max_rssi, rssi_c);
 770
 771         IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
 772                 rssi_a, rssi_b, rssi_c, max_rssi, agc);
 773
 774         /* dBm = max_rssi dB - agc dB - constant.
 775          * Higher AGC (higher radio gain) means lower signal. */
 776         return max_rssi - agc - IWLAGN_RSSI_OFFSET;
 777 }
 778
 779 /* Called for REPLY_RX_MPDU_CMD */
 780 static void iwlagn_rx_reply_rx(struct iwl_priv *priv,
 781                                struct iwl_rx_cmd_buffer *rxb)
 782 {
 783         struct ieee80211_hdr *header;
 784         struct ieee80211_rx_status rx_status = {};
 785         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 786         struct iwl_rx_phy_res *phy_res;
 787         __le32 rx_pkt_status;
 788         struct iwl_rx_mpdu_res_start *amsdu;
 789         u32 len;
 790         u32 ampdu_status;
 791         u32 rate_n_flags;
 792
 793         if (!priv->last_phy_res_valid) {
 794                 IWL_ERR(priv, "MPDU frame without cached PHY data\n");
 795                 return;
 796         }
 797         phy_res = &priv->last_phy_res;
 798         amsdu = (struct iwl_rx_mpdu_res_start *)pkt->data;
 799         header = (struct ieee80211_hdr *)(pkt->data + sizeof(*amsdu));
 800         len = le16_to_cpu(amsdu->byte_count);
 801         rx_pkt_status = *(__le32 *)(pkt->data + sizeof(*amsdu) + len);
 802         ampdu_status = iwlagn_translate_rx_status(priv,
 803                                                   le32_to_cpu(rx_pkt_status));
 804
 805         if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
 806                 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d\n",
 807                                 phy_res->cfg_phy_cnt);
 808                 return;
 809         }
 810
 811         if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
 812             !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
 813                 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
 814                                 le32_to_cpu(rx_pkt_status));
 815                 return;
 816         }
 817
 818         /* This will be used in several places later */
 819         rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
 820
 821         /* rx_status carries information about the packet to mac80211 */
 822         rx_status.mactime = le64_to_cpu(phy_res->timestamp);
 823         rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
 824                                 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 825         rx_status.freq =
 826                 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel),
 827                                                rx_status.band);
 828         rx_status.rate_idx =
 829                 iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
 830         rx_status.flag = 0;
 831
 832         /* TSF isn't reliable. In order to allow smooth user experience,
 833          * this W/A doesn't propagate it to the mac80211 */
 834         /*rx_status.flag |= RX_FLAG_MACTIME_START;*/
 835
 836         priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
 837
 838         /* Find max signal strength (dBm) among 3 antenna/receiver chains */
 839         rx_status.signal = iwlagn_calc_rssi(priv, phy_res);
 840
 841         IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n",
 842                 rx_status.signal, (unsigned long long)rx_status.mactime);
 843
 844         /*
 845          * "antenna number"
 846          *
 847          * It seems that the antenna field in the phy flags value
 848          * is actually a bit field. This is undefined by radiotap,
 849          * it wants an actual antenna number but I always get "7"
 850          * for most legacy frames I receive indicating that the
 851          * same frame was received on all three RX chains.
 852          *
 853          * I think this field should be removed in favor of a
 854          * new 802.11n radiotap field "RX chains" that is defined
 855          * as a bitmask.
 856          */
 857         rx_status.antenna =
 858                 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
 859                 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 860
 861         /* set the preamble flag if appropriate */
 862         if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
 863                 rx_status.enc_flags |= RX_ENC_FLAG_SHORTPRE;
 864
 865         if (phy_res->phy_flags & RX_RES_PHY_FLAGS_AGG_MSK) {
 866                 /*
 867                  * We know which subframes of an A-MPDU belong
 868                  * together since we get a single PHY response
 869                  * from the firmware for all of them
 870                  */
 871                 rx_status.flag |= RX_FLAG_AMPDU_DETAILS;
 872                 rx_status.ampdu_reference = priv->ampdu_ref;
 873         }
 874
 875         /* Set up the HT phy flags */
 876         if (rate_n_flags & RATE_MCS_HT_MSK)
 877                 rx_status.encoding = RX_ENC_HT;
 878         if (rate_n_flags & RATE_MCS_HT40_MSK)
 879                 rx_status.bw = RATE_INFO_BW_40;
 880         else
 881                 rx_status.bw = RATE_INFO_BW_20;
 882         if (rate_n_flags & RATE_MCS_SGI_MSK)
 883                 rx_status.enc_flags |= RX_ENC_FLAG_SHORT_GI;
 884         if (rate_n_flags & RATE_MCS_GF_MSK)
 885                 rx_status.enc_flags |= RX_ENC_FLAG_HT_GF;
 886
 887         iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status,
 888                                     rxb, &rx_status);
 889 }
 890
 891 static void iwlagn_rx_noa_notification(struct iwl_priv *priv,
 892                                        struct iwl_rx_cmd_buffer *rxb)
 893 {
 894         struct iwl_wipan_noa_data *new_data, *old_data;
 895         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 896         struct iwl_wipan_noa_notification *noa_notif = (void *)pkt->data;
 897
 898         /* no condition -- we're in softirq */
 899         old_data = rcu_dereference_protected(priv->noa_data, true);
 900
 901         if (noa_notif->noa_active) {
 902                 u32 len = le16_to_cpu(noa_notif->noa_attribute.length);
 903                 u32 copylen = len;
 904
 905                 /* EID, len, OUI, subtype */
 906                 len += 1 + 1 + 3 + 1;
 907                 /* P2P id, P2P length */
 908                 len += 1 + 2;
 909                 copylen += 1 + 2;
 910
 911                 new_data = kmalloc(sizeof(*new_data) + len, GFP_ATOMIC);
 912                 if (new_data) {
 913                         new_data->length = len;
 914                         new_data->data[0] = WLAN_EID_VENDOR_SPECIFIC;
 915                         new_data->data[1] = len - 2; /* not counting EID, len */
 916                         new_data->data[2] = (WLAN_OUI_WFA >> 16) & 0xff;
 917                         new_data->data[3] = (WLAN_OUI_WFA >> 8) & 0xff;
 918                         new_data->data[4] = (WLAN_OUI_WFA >> 0) & 0xff;
 919                         new_data->data[5] = WLAN_OUI_TYPE_WFA_P2P;
 920                         memcpy(&new_data->data[6], &noa_notif->noa_attribute,
 921                                copylen);
 922                 }
 923         } else
 924                 new_data = NULL;
 925
 926         rcu_assign_pointer(priv->noa_data, new_data);
 927
 928         if (old_data)
 929                 kfree_rcu(old_data, rcu_head);
 930 }
 931
 932 /**
 933  * iwl_setup_rx_handlers - Initialize Rx handler callbacks
 934  *
 935  * Setup the RX handlers for each of the reply types sent from the uCode
 936  * to the host.
 937  */
 938 void iwl_setup_rx_handlers(struct iwl_priv *priv)
 939 {
 940         void (**handlers)(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb);
 941
 942         handlers = priv->rx_handlers;
 943
 944         handlers[REPLY_ERROR]                   = iwlagn_rx_reply_error;
 945         handlers[CHANNEL_SWITCH_NOTIFICATION]   = iwlagn_rx_csa;
 946         handlers[SPECTRUM_MEASURE_NOTIFICATION] =
 947                 iwlagn_rx_spectrum_measure_notif;
 948         handlers[PM_SLEEP_NOTIFICATION]         = iwlagn_rx_pm_sleep_notif;
 949         handlers[PM_DEBUG_STATISTIC_NOTIFIC]    =
 950                 iwlagn_rx_pm_debug_statistics_notif;
 951         handlers[BEACON_NOTIFICATION]           = iwlagn_rx_beacon_notif;
 952         handlers[REPLY_ADD_STA]                 = iwl_add_sta_callback;
 953
 954         handlers[REPLY_WIPAN_NOA_NOTIFICATION]  = iwlagn_rx_noa_notification;
 955
 956         /*
 957          * The same handler is used for both the REPLY to a discrete
 958          * statistics request from the host as well as for the periodic
 959          * statistics notifications (after received beacons) from the uCode.
 960          */
 961         handlers[REPLY_STATISTICS_CMD]          = iwlagn_rx_reply_statistics;
 962         handlers[STATISTICS_NOTIFICATION]       = iwlagn_rx_statistics;
 963
 964         iwl_setup_rx_scan_handlers(priv);
 965
 966         handlers[CARD_STATE_NOTIFICATION]       = iwlagn_rx_card_state_notif;
 967         handlers[MISSED_BEACONS_NOTIFICATION]   =
 968                 iwlagn_rx_missed_beacon_notif;
 969
 970         /* Rx handlers */
 971         handlers[REPLY_RX_PHY_CMD]              = iwlagn_rx_reply_rx_phy;
 972         handlers[REPLY_RX_MPDU_CMD]             = iwlagn_rx_reply_rx;
 973
 974         /* block ack */
 975         handlers[REPLY_COMPRESSED_BA]           =
 976                 iwlagn_rx_reply_compressed_ba;
 977
 978         priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx;
 979
 980         /* set up notification wait support */
 981         iwl_notification_wait_init(&priv->notif_wait);
 982
 983         /* Set up BT Rx handlers */
 984         if (priv->lib->bt_params)
 985                 iwlagn_bt_rx_handler_setup(priv);
 986 }
 987
 988 void iwl_rx_dispatch(struct iwl_op_mode *op_mode, struct napi_struct *napi,
 989                      struct iwl_rx_cmd_buffer *rxb)
 990 {
 991         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 992         struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
 993
 994         /*
 995          * Do the notification wait before RX handlers so
 996          * even if the RX handler consumes the RXB we have
 997          * access to it in the notification wait entry.
 998          */
 999         iwl_notification_wait_notify(&priv->notif_wait, pkt);
1000
1001         /* Based on type of command response or notification,
1002          *   handle those that need handling via function in
1003          *   rx_handlers table.  See iwl_setup_rx_handlers() */
1004         if (priv->rx_handlers[pkt->hdr.cmd]) {
1005                 priv->rx_handlers_stats[pkt->hdr.cmd]++;
1006                 priv->rx_handlers[pkt->hdr.cmd](priv, rxb);
1007         } else {
1008                 /* No handling needed */
1009                 IWL_DEBUG_RX(priv, "No handler needed for %s, 0x%02x\n",
1010                              iwl_get_cmd_string(priv->trans,
1011                                                 iwl_cmd_id(pkt->hdr.cmd,
1012                                                            0, 0)),
1013                              pkt->hdr.cmd);
1014         }
1015 }