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  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <linuxwifi@intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26
  27 #include <linux/etherdevice.h>
  28 #include <linux/slab.h>
  29 #include <linux/sched.h>
  30 #include <net/mac80211.h>
  31 #include <asm/unaligned.h>
  32
  33 #include "iwl-trans.h"
  34 #include "iwl-io.h"
  35 #include "dev.h"
  36 #include "calib.h"
  37 #include "agn.h"
  38
  39 /******************************************************************************
  40  *
  41  * Generic RX handler implementations
  42  *
  43  ******************************************************************************/
  44
  45 static void iwlagn_rx_reply_error(struct iwl_priv *priv,
  46                                   struct iwl_rx_cmd_buffer *rxb)
  47 {
  48         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  49         struct iwl_error_resp *err_resp = (void *)pkt->data;
  50
  51         IWL_ERR(priv, "Error Reply type 0x%08X cmd REPLY_ERROR (0x%02X) "
  52                 "seq 0x%04X ser 0x%08X\n",
  53                 le32_to_cpu(err_resp->error_type),
  54                 err_resp->cmd_id,
  55                 le16_to_cpu(err_resp->bad_cmd_seq_num),
  56                 le32_to_cpu(err_resp->error_info));
  57 }
  58
  59 static void iwlagn_rx_csa(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb)
  60 {
  61         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  62         struct iwl_csa_notification *csa = (void *)pkt->data;
  63         /*
  64          * MULTI-FIXME
  65          * See iwlagn_mac_channel_switch.
  66          */
  67         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
  68         struct iwl_rxon_cmd *rxon = (void *)&ctx->active;
  69
  70         if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status))
  71                 return;
  72
  73         if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) {
  74                 rxon->channel = csa->channel;
  75                 ctx->staging.channel = csa->channel;
  76                 IWL_DEBUG_11H(priv, "CSA notif: channel %d\n",
  77                               le16_to_cpu(csa->channel));
  78                 iwl_chswitch_done(priv, true);
  79         } else {
  80                 IWL_ERR(priv, "CSA notif (fail) : channel %d\n",
  81                         le16_to_cpu(csa->channel));
  82                 iwl_chswitch_done(priv, false);
  83         }
  84 }
  85
  86
  87 static void iwlagn_rx_spectrum_measure_notif(struct iwl_priv *priv,
  88                                              struct iwl_rx_cmd_buffer *rxb)
  89 {
  90         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  91         struct iwl_spectrum_notification *report = (void *)pkt->data;
  92
  93         if (!report->state) {
  94                 IWL_DEBUG_11H(priv,
  95                         "Spectrum Measure Notification: Start\n");
  96                 return;
  97         }
  98
  99         memcpy(&priv->measure_report, report, sizeof(*report));
 100         priv->measurement_status |= MEASUREMENT_READY;
 101 }
 102
 103 static void iwlagn_rx_pm_sleep_notif(struct iwl_priv *priv,
 104                                      struct iwl_rx_cmd_buffer *rxb)
 105 {
 106 #ifdef CONFIG_IWLWIFI_DEBUG
 107         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 108         struct iwl_sleep_notification *sleep = (void *)pkt->data;
 109         IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n",
 110                      sleep->pm_sleep_mode, sleep->pm_wakeup_src);
 111 #endif
 112 }
 113
 114 static void iwlagn_rx_pm_debug_statistics_notif(struct iwl_priv *priv,
 115                                                 struct iwl_rx_cmd_buffer *rxb)
 116 {
 117         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 118         u32 __maybe_unused len = iwl_rx_packet_len(pkt);
 119         IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled "
 120                         "notification for PM_DEBUG_STATISTIC_NOTIFIC:\n", len);
 121         iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->data, len);
 122 }
 123
 124 static void iwlagn_rx_beacon_notif(struct iwl_priv *priv,
 125                                    struct iwl_rx_cmd_buffer *rxb)
 126 {
 127         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 128         struct iwlagn_beacon_notif *beacon = (void *)pkt->data;
 129 #ifdef CONFIG_IWLWIFI_DEBUG
 130         u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status);
 131         u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);
 132
 133         IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d "
 134                 "tsf:0x%.8x%.8x rate:%d\n",
 135                 status & TX_STATUS_MSK,
 136                 beacon->beacon_notify_hdr.failure_frame,
 137                 le32_to_cpu(beacon->ibss_mgr_status),
 138                 le32_to_cpu(beacon->high_tsf),
 139                 le32_to_cpu(beacon->low_tsf), rate);
 140 #endif
 141
 142         priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);
 143 }
 144
 145 /**
 146  * iwl_good_plcp_health - checks for plcp error.
 147  *
 148  * When the plcp error is exceeding the thresholds, reset the radio
 149  * to improve the throughput.
 150  */
 151 static bool iwlagn_good_plcp_health(struct iwl_priv *priv,
 152                                  struct statistics_rx_phy *cur_ofdm,
 153                                  struct statistics_rx_ht_phy *cur_ofdm_ht,
 154                                  unsigned int msecs)
 155 {
 156         int delta;
 157         int threshold = priv->plcp_delta_threshold;
 158
 159         if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
 160                 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
 161                 return true;
 162         }
 163
 164         delta = le32_to_cpu(cur_ofdm->plcp_err) -
 165                 le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) +
 166                 le32_to_cpu(cur_ofdm_ht->plcp_err) -
 167                 le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err);
 168
 169         /* Can be negative if firmware reset statistics */
 170         if (delta <= 0)
 171                 return true;
 172
 173         if ((delta * 100 / msecs) > threshold) {
 174                 IWL_DEBUG_RADIO(priv,
 175                                 "plcp health threshold %u delta %d msecs %u\n",
 176                                 threshold, delta, msecs);
 177                 return false;
 178         }
 179
 180         return true;
 181 }
 182
 183 int iwl_force_rf_reset(struct iwl_priv *priv, bool external)
 184 {
 185         struct iwl_rf_reset *rf_reset;
 186
 187         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 188                 return -EAGAIN;
 189
 190         if (!iwl_is_any_associated(priv)) {
 191                 IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n");
 192                 return -ENOLINK;
 193         }
 194
 195         rf_reset = &priv->rf_reset;
 196         rf_reset->reset_request_count++;
 197         if (!external && rf_reset->last_reset_jiffies &&
 198             time_after(rf_reset->last_reset_jiffies +
 199                        IWL_DELAY_NEXT_FORCE_RF_RESET, jiffies)) {
 200                 IWL_DEBUG_INFO(priv, "RF reset rejected\n");
 201                 rf_reset->reset_reject_count++;
 202                 return -EAGAIN;
 203         }
 204         rf_reset->reset_success_count++;
 205         rf_reset->last_reset_jiffies = jiffies;
 206
 207         /*
 208          * There is no easy and better way to force reset the radio,
 209          * the only known method is switching channel which will force to
 210          * reset and tune the radio.
 211          * Use internal short scan (single channel) operation to should
 212          * achieve this objective.
 213          * Driver should reset the radio when number of consecutive missed
 214          * beacon, or any other uCode error condition detected.
 215          */
 216         IWL_DEBUG_INFO(priv, "perform radio reset.\n");
 217         iwl_internal_short_hw_scan(priv);
 218         return 0;
 219 }
 220
 221
 222 static void iwlagn_recover_from_statistics(struct iwl_priv *priv,
 223                                 struct statistics_rx_phy *cur_ofdm,
 224                                 struct statistics_rx_ht_phy *cur_ofdm_ht,
 225                                 struct statistics_tx *tx,
 226                                 unsigned long stamp)
 227 {
 228         unsigned int msecs;
 229
 230         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 231                 return;
 232
 233         msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies);
 234
 235         /* Only gather statistics and update time stamp when not associated */
 236         if (!iwl_is_any_associated(priv))
 237                 return;
 238
 239         /* Do not check/recover when do not have enough statistics data */
 240         if (msecs < 99)
 241                 return;
 242
 243         if (!iwlagn_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs))
 244                 iwl_force_rf_reset(priv, false);
 245 }
 246
 247 /* Calculate noise level, based on measurements during network silence just
 248  *   before arriving beacon.  This measurement can be done only if we know
 249  *   exactly when to expect beacons, therefore only when we're associated. */
 250 static void iwlagn_rx_calc_noise(struct iwl_priv *priv)
 251 {
 252         struct statistics_rx_non_phy *rx_info;
 253         int num_active_rx = 0;
 254         int total_silence = 0;
 255         int bcn_silence_a, bcn_silence_b, bcn_silence_c;
 256         int last_rx_noise;
 257
 258         rx_info = &priv->statistics.rx_non_phy;
 259
 260         bcn_silence_a =
 261                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 262         bcn_silence_b =
 263                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 264         bcn_silence_c =
 265                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 266
 267         if (bcn_silence_a) {
 268                 total_silence += bcn_silence_a;
 269                 num_active_rx++;
 270         }
 271         if (bcn_silence_b) {
 272                 total_silence += bcn_silence_b;
 273                 num_active_rx++;
 274         }
 275         if (bcn_silence_c) {
 276                 total_silence += bcn_silence_c;
 277                 num_active_rx++;
 278         }
 279
 280         /* Average among active antennas */
 281         if (num_active_rx)
 282                 last_rx_noise = (total_silence / num_active_rx) - 107;
 283         else
 284                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 285
 286         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 287                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 288                         last_rx_noise);
 289 }
 290
 291 #ifdef CONFIG_IWLWIFI_DEBUGFS
 292 /*
 293  *  based on the assumption of all statistics counter are in DWORD
 294  *  FIXME: This function is for debugging, do not deal with
 295  *  the case of counters roll-over.
 296  */
 297 static void accum_stats(__le32 *prev, __le32 *cur, __le32 *delta,
 298                         __le32 *max_delta, __le32 *accum, int size)
 299 {
 300         int i;
 301
 302         for (i = 0;
 303              i < size / sizeof(__le32);
 304              i++, prev++, cur++, delta++, max_delta++, accum++) {
 305                 if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) {
 306                         *delta = cpu_to_le32(
 307                                 le32_to_cpu(*cur) - le32_to_cpu(*prev));
 308                         le32_add_cpu(accum, le32_to_cpu(*delta));
 309                         if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta))
 310                                 *max_delta = *delta;
 311                 }
 312         }
 313 }
 314
 315 static void
 316 iwlagn_accumulative_statistics(struct iwl_priv *priv,
 317                             struct statistics_general_common *common,
 318                             struct statistics_rx_non_phy *rx_non_phy,
 319                             struct statistics_rx_phy *rx_ofdm,
 320                             struct statistics_rx_ht_phy *rx_ofdm_ht,
 321                             struct statistics_rx_phy *rx_cck,
 322                             struct statistics_tx *tx,
 323                             struct statistics_bt_activity *bt_activity)
 324 {
 325 #define ACCUM(_name)    \
 326         accum_stats((__le32 *)&priv->statistics._name,          \
 327                     (__le32 *)_name,                            \
 328                     (__le32 *)&priv->delta_stats._name,         \
 329                     (__le32 *)&priv->max_delta_stats._name,     \
 330                     (__le32 *)&priv->accum_stats._name,         \
 331                     sizeof(*_name));
 332
 333         ACCUM(common);
 334         ACCUM(rx_non_phy);
 335         ACCUM(rx_ofdm);
 336         ACCUM(rx_ofdm_ht);
 337         ACCUM(rx_cck);
 338         ACCUM(tx);
 339         if (bt_activity)
 340                 ACCUM(bt_activity);
 341 #undef ACCUM
 342 }
 343 #else
 344 static inline void
 345 iwlagn_accumulative_statistics(struct iwl_priv *priv,
 346                             struct statistics_general_common *common,
 347                             struct statistics_rx_non_phy *rx_non_phy,
 348                             struct statistics_rx_phy *rx_ofdm,
 349                             struct statistics_rx_ht_phy *rx_ofdm_ht,
 350                             struct statistics_rx_phy *rx_cck,
 351                             struct statistics_tx *tx,
 352                             struct statistics_bt_activity *bt_activity)
 353 {
 354 }
 355 #endif
 356
 357 static void iwlagn_rx_statistics(struct iwl_priv *priv,
 358                                  struct iwl_rx_cmd_buffer *rxb)
 359 {
 360         unsigned long stamp = jiffies;
 361         const int reg_recalib_period = 60;
 362         int change;
 363         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 364         u32 len = iwl_rx_packet_payload_len(pkt);
 365         __le32 *flag;
 366         struct statistics_general_common *common;
 367         struct statistics_rx_non_phy *rx_non_phy;
 368         struct statistics_rx_phy *rx_ofdm;
 369         struct statistics_rx_ht_phy *rx_ofdm_ht;
 370         struct statistics_rx_phy *rx_cck;
 371         struct statistics_tx *tx;
 372         struct statistics_bt_activity *bt_activity;
 373
 374         IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n",
 375                      len);
 376
 377         spin_lock(&priv->statistics.lock);
 378
 379         if (len == sizeof(struct iwl_bt_notif_statistics)) {
 380                 struct iwl_bt_notif_statistics *stats;
 381                 stats = (void *)&pkt->data;
 382                 flag = &stats->flag;
 383                 common = &stats->general.common;
 384                 rx_non_phy = &stats->rx.general.common;
 385                 rx_ofdm = &stats->rx.ofdm;
 386                 rx_ofdm_ht = &stats->rx.ofdm_ht;
 387                 rx_cck = &stats->rx.cck;
 388                 tx = &stats->tx;
 389                 bt_activity = &stats->general.activity;
 390
 391 #ifdef CONFIG_IWLWIFI_DEBUGFS
 392                 /* handle this exception directly */
 393                 priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills;
 394                 le32_add_cpu(&priv->statistics.accum_num_bt_kills,
 395                              le32_to_cpu(stats->rx.general.num_bt_kills));
 396 #endif
 397         } else if (len == sizeof(struct iwl_notif_statistics)) {
 398                 struct iwl_notif_statistics *stats;
 399                 stats = (void *)&pkt->data;
 400                 flag = &stats->flag;
 401                 common = &stats->general.common;
 402                 rx_non_phy = &stats->rx.general;
 403                 rx_ofdm = &stats->rx.ofdm;
 404                 rx_ofdm_ht = &stats->rx.ofdm_ht;
 405                 rx_cck = &stats->rx.cck;
 406                 tx = &stats->tx;
 407                 bt_activity = NULL;
 408         } else {
 409                 WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n",
 410                           len, sizeof(struct iwl_bt_notif_statistics),
 411                           sizeof(struct iwl_notif_statistics));
 412                 spin_unlock(&priv->statistics.lock);
 413                 return;
 414         }
 415
 416         change = common->temperature != priv->statistics.common.temperature ||
 417                  (*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 418                  (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK);
 419
 420         iwlagn_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm,
 421                                     rx_ofdm_ht, rx_cck, tx, bt_activity);
 422
 423         iwlagn_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp);
 424
 425         priv->statistics.flag = *flag;
 426         memcpy(&priv->statistics.common, common, sizeof(*common));
 427         memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy));
 428         memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm));
 429         memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht));
 430         memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck));
 431         memcpy(&priv->statistics.tx, tx, sizeof(*tx));
 432 #ifdef CONFIG_IWLWIFI_DEBUGFS
 433         if (bt_activity)
 434                 memcpy(&priv->statistics.bt_activity, bt_activity,
 435                         sizeof(*bt_activity));
 436 #endif
 437
 438         priv->rx_statistics_jiffies = stamp;
 439
 440         set_bit(STATUS_STATISTICS, &priv->status);
 441
 442         /* Reschedule the statistics timer to occur in
 443          * reg_recalib_period seconds to ensure we get a
 444          * thermal update even if the uCode doesn't give
 445          * us one */
 446         mod_timer(&priv->statistics_periodic, jiffies +
 447                   msecs_to_jiffies(reg_recalib_period * 1000));
 448
 449         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 450             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 451                 iwlagn_rx_calc_noise(priv);
 452                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 453         }
 454         if (priv->lib->temperature && change)
 455                 priv->lib->temperature(priv);
 456
 457         spin_unlock(&priv->statistics.lock);
 458 }
 459
 460 static void iwlagn_rx_reply_statistics(struct iwl_priv *priv,
 461                                        struct iwl_rx_cmd_buffer *rxb)
 462 {
 463         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 464         struct iwl_notif_statistics *stats = (void *)pkt->data;
 465
 466         if (le32_to_cpu(stats->flag) & UCODE_STATISTICS_CLEAR_MSK) {
 467 #ifdef CONFIG_IWLWIFI_DEBUGFS
 468                 memset(&priv->accum_stats, 0,
 469                         sizeof(priv->accum_stats));
 470                 memset(&priv->delta_stats, 0,
 471                         sizeof(priv->delta_stats));
 472                 memset(&priv->max_delta_stats, 0,
 473                         sizeof(priv->max_delta_stats));
 474 #endif
 475                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 476         }
 477
 478         iwlagn_rx_statistics(priv, rxb);
 479 }
 480
 481 /* Handle notification from uCode that card's power state is changing
 482  * due to software, hardware, or critical temperature RFKILL */
 483 static void iwlagn_rx_card_state_notif(struct iwl_priv *priv,
 484                                        struct iwl_rx_cmd_buffer *rxb)
 485 {
 486         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 487         struct iwl_card_state_notif *card_state_notif = (void *)pkt->data;
 488         u32 flags = le32_to_cpu(card_state_notif->flags);
 489         unsigned long status = priv->status;
 490
 491         IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
 492                           (flags & HW_CARD_DISABLED) ? "Kill" : "On",
 493                           (flags & SW_CARD_DISABLED) ? "Kill" : "On",
 494                           (flags & CT_CARD_DISABLED) ?
 495                           "Reached" : "Not reached");
 496
 497         if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
 498                      CT_CARD_DISABLED)) {
 499
 500                 iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_SET,
 501                             CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 502
 503                 iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C,
 504                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 505
 506                 if (!(flags & RXON_CARD_DISABLED)) {
 507                         iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_CLR,
 508                                     CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 509                         iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C,
 510                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 511                 }
 512                 if (flags & CT_CARD_DISABLED)
 513                         iwl_tt_enter_ct_kill(priv);
 514         }
 515         if (!(flags & CT_CARD_DISABLED))
 516                 iwl_tt_exit_ct_kill(priv);
 517
 518         if (flags & HW_CARD_DISABLED)
 519                 set_bit(STATUS_RF_KILL_HW, &priv->status);
 520         else
 521                 clear_bit(STATUS_RF_KILL_HW, &priv->status);
 522
 523
 524         if (!(flags & RXON_CARD_DISABLED))
 525                 iwl_scan_cancel(priv);
 526
 527         if ((test_bit(STATUS_RF_KILL_HW, &status) !=
 528              test_bit(STATUS_RF_KILL_HW, &priv->status)))
 529                 wiphy_rfkill_set_hw_state(priv->hw->wiphy,
 530                         test_bit(STATUS_RF_KILL_HW, &priv->status));
 531 }
 532
 533 static void iwlagn_rx_missed_beacon_notif(struct iwl_priv *priv,
 534                                           struct iwl_rx_cmd_buffer *rxb)
 535
 536 {
 537         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 538         struct iwl_missed_beacon_notif *missed_beacon = (void *)pkt->data;
 539
 540         if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
 541             priv->missed_beacon_threshold) {
 542                 IWL_DEBUG_CALIB(priv,
 543                     "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 544                     le32_to_cpu(missed_beacon->consecutive_missed_beacons),
 545                     le32_to_cpu(missed_beacon->total_missed_becons),
 546                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 547                     le32_to_cpu(missed_beacon->num_expected_beacons));
 548                 if (!test_bit(STATUS_SCANNING, &priv->status))
 549                         iwl_init_sensitivity(priv);
 550         }
 551 }
 552
 553 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
 554  * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
 555 static void iwlagn_rx_reply_rx_phy(struct iwl_priv *priv,
 556                                    struct iwl_rx_cmd_buffer *rxb)
 557 {
 558         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 559
 560         priv->last_phy_res_valid = true;
 561         priv->ampdu_ref++;
 562         memcpy(&priv->last_phy_res, pkt->data,
 563                sizeof(struct iwl_rx_phy_res));
 564 }
 565
 566 /*
 567  * returns non-zero if packet should be dropped
 568  */
 569 static int iwlagn_set_decrypted_flag(struct iwl_priv *priv,
 570                                   struct ieee80211_hdr *hdr,
 571                                   u32 decrypt_res,
 572                                   struct ieee80211_rx_status *stats)
 573 {
 574         u16 fc = le16_to_cpu(hdr->frame_control);
 575
 576         /*
 577          * All contexts have the same setting here due to it being
 578          * a module parameter, so OK to check any context.
 579          */
 580         if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags &
 581                                                 RXON_FILTER_DIS_DECRYPT_MSK)
 582                 return 0;
 583
 584         if (!(fc & IEEE80211_FCTL_PROTECTED))
 585                 return 0;
 586
 587         IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
 588         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 589         case RX_RES_STATUS_SEC_TYPE_TKIP:
 590                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 591                  * Decryption will be done in SW. */
 592                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 593                     RX_RES_STATUS_BAD_KEY_TTAK)
 594                         break;
 595
 596         case RX_RES_STATUS_SEC_TYPE_WEP:
 597                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 598                     RX_RES_STATUS_BAD_ICV_MIC) {
 599                         /* bad ICV, the packet is destroyed since the
 600                          * decryption is inplace, drop it */
 601                         IWL_DEBUG_RX(priv, "Packet destroyed\n");
 602                         return -1;
 603                 }
 604         case RX_RES_STATUS_SEC_TYPE_CCMP:
 605                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 606                     RX_RES_STATUS_DECRYPT_OK) {
 607                         IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
 608                         stats->flag |= RX_FLAG_DECRYPTED;
 609                 }
 610                 break;
 611
 612         default:
 613                 break;
 614         }
 615         return 0;
 616 }
 617
 618 static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv,
 619                                         struct ieee80211_hdr *hdr,
 620                                         u16 len,
 621                                         u32 ampdu_status,
 622                                         struct iwl_rx_cmd_buffer *rxb,
 623                                         struct ieee80211_rx_status *stats)
 624 {
 625         struct sk_buff *skb;
 626         __le16 fc = hdr->frame_control;
 627         struct iwl_rxon_context *ctx;
 628         unsigned int hdrlen, fraglen;
 629
 630         /* We only process data packets if the interface is open */
 631         if (unlikely(!priv->is_open)) {
 632                 IWL_DEBUG_DROP_LIMIT(priv,
 633                     "Dropping packet while interface is not open.\n");
 634                 return;
 635         }
 636
 637         /* In case of HW accelerated crypto and bad decryption, drop */
 638         if (!iwlwifi_mod_params.swcrypto &&
 639             iwlagn_set_decrypted_flag(priv, hdr, ampdu_status, stats))
 640                 return;
 641
 642         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 643          * ieee80211_hdr pulled.
 644          */
 645         skb = alloc_skb(128, GFP_ATOMIC);
 646         if (!skb) {
 647                 IWL_ERR(priv, "alloc_skb failed\n");
 648                 return;
 649         }
 650         /* If frame is small enough to fit in skb->head, pull it completely.
 651          * If not, only pull ieee80211_hdr so that splice() or TCP coalesce
 652          * are more efficient.
 653          */
 654         hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr);
 655
 656         skb_put_data(skb, hdr, hdrlen);
 657         fraglen = len - hdrlen;
 658
 659         if (fraglen) {
 660                 int offset = (void *)hdr + hdrlen -
 661                              rxb_addr(rxb) + rxb_offset(rxb);
 662
 663                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 664                                 fraglen, rxb->truesize);
 665         }
 666
 667         /*
 668         * Wake any queues that were stopped due to a passive channel tx
 669         * failure. This can happen because the regulatory enforcement in
 670         * the device waits for a beacon before allowing transmission,
 671         * sometimes even after already having transmitted frames for the
 672         * association because the new RXON may reset the information.
 673         */
 674         if (unlikely(ieee80211_is_beacon(fc) && priv->passive_no_rx)) {
 675                 for_each_context(priv, ctx) {
 676                         if (!ether_addr_equal(hdr->addr3,
 677                                               ctx->active.bssid_addr))
 678                                 continue;
 679                         iwlagn_lift_passive_no_rx(priv);
 680                 }
 681         }
 682
 683         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
 684
 685         ieee80211_rx_napi(priv->hw, NULL, skb, priv->napi);
 686 }
 687
 688 static u32 iwlagn_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
 689 {
 690         u32 decrypt_out = 0;
 691
 692         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
 693                                         RX_RES_STATUS_STATION_FOUND)
 694                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
 695                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
 696
 697         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
 698
 699         /* packet was not encrypted */
 700         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 701                                         RX_RES_STATUS_SEC_TYPE_NONE)
 702                 return decrypt_out;
 703
 704         /* packet was encrypted with unknown alg */
 705         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 706                                         RX_RES_STATUS_SEC_TYPE_ERR)
 707                 return decrypt_out;
 708
 709         /* decryption was not done in HW */
 710         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
 711                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
 712                 return decrypt_out;
 713
 714         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
 715
 716         case RX_RES_STATUS_SEC_TYPE_CCMP:
 717                 /* alg is CCM: check MIC only */
 718                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
 719                         /* Bad MIC */
 720                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 721                 else
 722                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 723
 724                 break;
 725
 726         case RX_RES_STATUS_SEC_TYPE_TKIP:
 727                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
 728                         /* Bad TTAK */
 729                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
 730                         break;
 731                 }
 732                 /* fall through if TTAK OK */
 733         default:
 734                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
 735                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 736                 else
 737                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 738                 break;
 739         }
 740
 741         IWL_DEBUG_RX(priv, "decrypt_in:0x%x  decrypt_out = 0x%x\n",
 742                                         decrypt_in, decrypt_out);
 743
 744         return decrypt_out;
 745 }
 746
 747 /* Calc max signal level (dBm) among 3 possible receivers */
 748 static int iwlagn_calc_rssi(struct iwl_priv *priv,
 749                              struct iwl_rx_phy_res *rx_resp)
 750 {
 751         /* data from PHY/DSP regarding signal strength, etc.,
 752          *   contents are always there, not configurable by host
 753          */
 754         struct iwlagn_non_cfg_phy *ncphy =
 755                 (struct iwlagn_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
 756         u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
 757         u8 agc;
 758
 759         val  = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_AGC_IDX]);
 760         agc = (val & IWLAGN_OFDM_AGC_MSK) >> IWLAGN_OFDM_AGC_BIT_POS;
 761
 762         /* Find max rssi among 3 possible receivers.
 763          * These values are measured by the digital signal processor (DSP).
 764          * They should stay fairly constant even as the signal strength varies,
 765          *   if the radio's automatic gain control (AGC) is working right.
 766          * AGC value (see below) will provide the "interesting" info.
 767          */
 768         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_AB_IDX]);
 769         rssi_a = (val & IWLAGN_OFDM_RSSI_INBAND_A_BITMSK) >>
 770                 IWLAGN_OFDM_RSSI_A_BIT_POS;
 771         rssi_b = (val & IWLAGN_OFDM_RSSI_INBAND_B_BITMSK) >>
 772                 IWLAGN_OFDM_RSSI_B_BIT_POS;
 773         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_C_IDX]);
 774         rssi_c = (val & IWLAGN_OFDM_RSSI_INBAND_C_BITMSK) >>
 775                 IWLAGN_OFDM_RSSI_C_BIT_POS;
 776
 777         max_rssi = max_t(u32, rssi_a, rssi_b);
 778         max_rssi = max_t(u32, max_rssi, rssi_c);
 779
 780         IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
 781                 rssi_a, rssi_b, rssi_c, max_rssi, agc);
 782
 783         /* dBm = max_rssi dB - agc dB - constant.
 784          * Higher AGC (higher radio gain) means lower signal. */
 785         return max_rssi - agc - IWLAGN_RSSI_OFFSET;
 786 }
 787
 788 /* Called for REPLY_RX_MPDU_CMD */
 789 static void iwlagn_rx_reply_rx(struct iwl_priv *priv,
 790                                struct iwl_rx_cmd_buffer *rxb)
 791 {
 792         struct ieee80211_hdr *header;
 793         struct ieee80211_rx_status rx_status = {};
 794         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 795         struct iwl_rx_phy_res *phy_res;
 796         __le32 rx_pkt_status;
 797         struct iwl_rx_mpdu_res_start *amsdu;
 798         u32 len;
 799         u32 ampdu_status;
 800         u32 rate_n_flags;
 801
 802         if (!priv->last_phy_res_valid) {
 803                 IWL_ERR(priv, "MPDU frame without cached PHY data\n");
 804                 return;
 805         }
 806         phy_res = &priv->last_phy_res;
 807         amsdu = (struct iwl_rx_mpdu_res_start *)pkt->data;
 808         header = (struct ieee80211_hdr *)(pkt->data + sizeof(*amsdu));
 809         len = le16_to_cpu(amsdu->byte_count);
 810         rx_pkt_status = *(__le32 *)(pkt->data + sizeof(*amsdu) + len);
 811         ampdu_status = iwlagn_translate_rx_status(priv,
 812                                                   le32_to_cpu(rx_pkt_status));
 813
 814         if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
 815                 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d\n",
 816                                 phy_res->cfg_phy_cnt);
 817                 return;
 818         }
 819
 820         if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
 821             !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
 822                 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
 823                                 le32_to_cpu(rx_pkt_status));
 824                 return;
 825         }
 826
 827         /* This will be used in several places later */
 828         rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
 829
 830         /* rx_status carries information about the packet to mac80211 */
 831         rx_status.mactime = le64_to_cpu(phy_res->timestamp);
 832         rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
 833                                 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 834         rx_status.freq =
 835                 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel),
 836                                                rx_status.band);
 837         rx_status.rate_idx =
 838                 iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
 839         rx_status.flag = 0;
 840
 841         /* TSF isn't reliable. In order to allow smooth user experience,
 842          * this W/A doesn't propagate it to the mac80211 */
 843         /*rx_status.flag |= RX_FLAG_MACTIME_START;*/
 844
 845         priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
 846
 847         /* Find max signal strength (dBm) among 3 antenna/receiver chains */
 848         rx_status.signal = iwlagn_calc_rssi(priv, phy_res);
 849
 850         IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n",
 851                 rx_status.signal, (unsigned long long)rx_status.mactime);
 852
 853         /*
 854          * "antenna number"
 855          *
 856          * It seems that the antenna field in the phy flags value
 857          * is actually a bit field. This is undefined by radiotap,
 858          * it wants an actual antenna number but I always get "7"
 859          * for most legacy frames I receive indicating that the
 860          * same frame was received on all three RX chains.
 861          *
 862          * I think this field should be removed in favor of a
 863          * new 802.11n radiotap field "RX chains" that is defined
 864          * as a bitmask.
 865          */
 866         rx_status.antenna =
 867                 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
 868                 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 869
 870         /* set the preamble flag if appropriate */
 871         if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
 872                 rx_status.enc_flags |= RX_ENC_FLAG_SHORTPRE;
 873
 874         if (phy_res->phy_flags & RX_RES_PHY_FLAGS_AGG_MSK) {
 875                 /*
 876                  * We know which subframes of an A-MPDU belong
 877                  * together since we get a single PHY response
 878                  * from the firmware for all of them
 879                  */
 880                 rx_status.flag |= RX_FLAG_AMPDU_DETAILS;
 881                 rx_status.ampdu_reference = priv->ampdu_ref;
 882         }
 883
 884         /* Set up the HT phy flags */
 885         if (rate_n_flags & RATE_MCS_HT_MSK)
 886                 rx_status.encoding = RX_ENC_HT;
 887         if (rate_n_flags & RATE_MCS_HT40_MSK)
 888                 rx_status.bw = RATE_INFO_BW_40;
 889         else
 890                 rx_status.bw = RATE_INFO_BW_20;
 891         if (rate_n_flags & RATE_MCS_SGI_MSK)
 892                 rx_status.enc_flags |= RX_ENC_FLAG_SHORT_GI;
 893         if (rate_n_flags & RATE_MCS_GF_MSK)
 894                 rx_status.enc_flags |= RX_ENC_FLAG_HT_GF;
 895
 896         iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status,
 897                                     rxb, &rx_status);
 898 }
 899
 900 static void iwlagn_rx_noa_notification(struct iwl_priv *priv,
 901                                        struct iwl_rx_cmd_buffer *rxb)
 902 {
 903         struct iwl_wipan_noa_data *new_data, *old_data;
 904         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 905         struct iwl_wipan_noa_notification *noa_notif = (void *)pkt->data;
 906
 907         /* no condition -- we're in softirq */
 908         old_data = rcu_dereference_protected(priv->noa_data, true);
 909
 910         if (noa_notif->noa_active) {
 911                 u32 len = le16_to_cpu(noa_notif->noa_attribute.length);
 912                 u32 copylen = len;
 913
 914                 /* EID, len, OUI, subtype */
 915                 len += 1 + 1 + 3 + 1;
 916                 /* P2P id, P2P length */
 917                 len += 1 + 2;
 918                 copylen += 1 + 2;
 919
 920                 new_data = kmalloc(sizeof(*new_data) + len, GFP_ATOMIC);
 921                 if (new_data) {
 922                         new_data->length = len;
 923                         new_data->data[0] = WLAN_EID_VENDOR_SPECIFIC;
 924                         new_data->data[1] = len - 2; /* not counting EID, len */
 925                         new_data->data[2] = (WLAN_OUI_WFA >> 16) & 0xff;
 926                         new_data->data[3] = (WLAN_OUI_WFA >> 8) & 0xff;
 927                         new_data->data[4] = (WLAN_OUI_WFA >> 0) & 0xff;
 928                         new_data->data[5] = WLAN_OUI_TYPE_WFA_P2P;
 929                         memcpy(&new_data->data[6], &noa_notif->noa_attribute,
 930                                copylen);
 931                 }
 932         } else
 933                 new_data = NULL;
 934
 935         rcu_assign_pointer(priv->noa_data, new_data);
 936
 937         if (old_data)
 938                 kfree_rcu(old_data, rcu_head);
 939 }
 940
 941 /**
 942  * iwl_setup_rx_handlers - Initialize Rx handler callbacks
 943  *
 944  * Setup the RX handlers for each of the reply types sent from the uCode
 945  * to the host.
 946  */
 947 void iwl_setup_rx_handlers(struct iwl_priv *priv)
 948 {
 949         void (**handlers)(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb);
 950
 951         handlers = priv->rx_handlers;
 952
 953         handlers[REPLY_ERROR]                   = iwlagn_rx_reply_error;
 954         handlers[CHANNEL_SWITCH_NOTIFICATION]   = iwlagn_rx_csa;
 955         handlers[SPECTRUM_MEASURE_NOTIFICATION] =
 956                 iwlagn_rx_spectrum_measure_notif;
 957         handlers[PM_SLEEP_NOTIFICATION]         = iwlagn_rx_pm_sleep_notif;
 958         handlers[PM_DEBUG_STATISTIC_NOTIFIC]    =
 959                 iwlagn_rx_pm_debug_statistics_notif;
 960         handlers[BEACON_NOTIFICATION]           = iwlagn_rx_beacon_notif;
 961         handlers[REPLY_ADD_STA]                 = iwl_add_sta_callback;
 962
 963         handlers[REPLY_WIPAN_NOA_NOTIFICATION]  = iwlagn_rx_noa_notification;
 964
 965         /*
 966          * The same handler is used for both the REPLY to a discrete
 967          * statistics request from the host as well as for the periodic
 968          * statistics notifications (after received beacons) from the uCode.
 969          */
 970         handlers[REPLY_STATISTICS_CMD]          = iwlagn_rx_reply_statistics;
 971         handlers[STATISTICS_NOTIFICATION]       = iwlagn_rx_statistics;
 972
 973         iwl_setup_rx_scan_handlers(priv);
 974
 975         handlers[CARD_STATE_NOTIFICATION]       = iwlagn_rx_card_state_notif;
 976         handlers[MISSED_BEACONS_NOTIFICATION]   =
 977                 iwlagn_rx_missed_beacon_notif;
 978
 979         /* Rx handlers */
 980         handlers[REPLY_RX_PHY_CMD]              = iwlagn_rx_reply_rx_phy;
 981         handlers[REPLY_RX_MPDU_CMD]             = iwlagn_rx_reply_rx;
 982
 983         /* block ack */
 984         handlers[REPLY_COMPRESSED_BA]           =
 985                 iwlagn_rx_reply_compressed_ba;
 986
 987         priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx;
 988
 989         /* set up notification wait support */
 990         iwl_notification_wait_init(&priv->notif_wait);
 991
 992         /* Set up BT Rx handlers */
 993         if (priv->lib->bt_params)
 994                 iwlagn_bt_rx_handler_setup(priv);
 995 }
 996
 997 void iwl_rx_dispatch(struct iwl_op_mode *op_mode, struct napi_struct *napi,
 998                      struct iwl_rx_cmd_buffer *rxb)
 999 {
1000         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1001         struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
1002
1003         /*
1004          * Do the notification wait before RX handlers so
1005          * even if the RX handler consumes the RXB we have
1006          * access to it in the notification wait entry.
1007          */
1008         iwl_notification_wait_notify(&priv->notif_wait, pkt);
1009
1010         /* Based on type of command response or notification,
1011          *   handle those that need handling via function in
1012          *   rx_handlers table.  See iwl_setup_rx_handlers() */
1013         if (priv->rx_handlers[pkt->hdr.cmd]) {
1014                 priv->rx_handlers_stats[pkt->hdr.cmd]++;
1015                 priv->rx_handlers[pkt->hdr.cmd](priv, rxb);
1016         } else {
1017                 /* No handling needed */
1018                 IWL_DEBUG_RX(priv, "No handler needed for %s, 0x%02x\n",
1019                              iwl_get_cmd_string(priv->trans,
1020                                                 iwl_cmd_id(pkt->hdr.cmd,
1021                                                            0, 0)),
1022                              pkt->hdr.cmd);
1023         }
1024 }