Pileus Git - ~andy/linux/blob - drivers/net/wireless/iwlwifi/iwl-rx.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project, as well
   6  * as portions of the ieee80211 subsystem header files.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  20  *
  21  * The full GNU General Public License is included in this distribution in the
  22  * file called LICENSE.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  *****************************************************************************/
  29
  30 #include <linux/etherdevice.h>
  31 #include <linux/slab.h>
  32 #include <linux/sched.h>
  33 #include <net/mac80211.h>
  34 #include <asm/unaligned.h>
  35 #include "iwl-eeprom.h"
  36 #include "iwl-dev.h"
  37 #include "iwl-core.h"
  38 #include "iwl-sta.h"
  39 #include "iwl-io.h"
  40 #include "iwl-helpers.h"
  41 #include "iwl-agn-calib.h"
  42 #include "iwl-agn.h"
  43 #include "iwl-shared.h"
  44
  45 const char *get_cmd_string(u8 cmd)
  46 {
  47         switch (cmd) {
  48                 IWL_CMD(REPLY_ALIVE);
  49                 IWL_CMD(REPLY_ERROR);
  50                 IWL_CMD(REPLY_RXON);
  51                 IWL_CMD(REPLY_RXON_ASSOC);
  52                 IWL_CMD(REPLY_QOS_PARAM);
  53                 IWL_CMD(REPLY_RXON_TIMING);
  54                 IWL_CMD(REPLY_ADD_STA);
  55                 IWL_CMD(REPLY_REMOVE_STA);
  56                 IWL_CMD(REPLY_REMOVE_ALL_STA);
  57                 IWL_CMD(REPLY_TXFIFO_FLUSH);
  58                 IWL_CMD(REPLY_WEPKEY);
  59                 IWL_CMD(REPLY_TX);
  60                 IWL_CMD(REPLY_LEDS_CMD);
  61                 IWL_CMD(REPLY_TX_LINK_QUALITY_CMD);
  62                 IWL_CMD(COEX_PRIORITY_TABLE_CMD);
  63                 IWL_CMD(COEX_MEDIUM_NOTIFICATION);
  64                 IWL_CMD(COEX_EVENT_CMD);
  65                 IWL_CMD(REPLY_QUIET_CMD);
  66                 IWL_CMD(REPLY_CHANNEL_SWITCH);
  67                 IWL_CMD(CHANNEL_SWITCH_NOTIFICATION);
  68                 IWL_CMD(REPLY_SPECTRUM_MEASUREMENT_CMD);
  69                 IWL_CMD(SPECTRUM_MEASURE_NOTIFICATION);
  70                 IWL_CMD(POWER_TABLE_CMD);
  71                 IWL_CMD(PM_SLEEP_NOTIFICATION);
  72                 IWL_CMD(PM_DEBUG_STATISTIC_NOTIFIC);
  73                 IWL_CMD(REPLY_SCAN_CMD);
  74                 IWL_CMD(REPLY_SCAN_ABORT_CMD);
  75                 IWL_CMD(SCAN_START_NOTIFICATION);
  76                 IWL_CMD(SCAN_RESULTS_NOTIFICATION);
  77                 IWL_CMD(SCAN_COMPLETE_NOTIFICATION);
  78                 IWL_CMD(BEACON_NOTIFICATION);
  79                 IWL_CMD(REPLY_TX_BEACON);
  80                 IWL_CMD(WHO_IS_AWAKE_NOTIFICATION);
  81                 IWL_CMD(QUIET_NOTIFICATION);
  82                 IWL_CMD(REPLY_TX_PWR_TABLE_CMD);
  83                 IWL_CMD(MEASURE_ABORT_NOTIFICATION);
  84                 IWL_CMD(REPLY_BT_CONFIG);
  85                 IWL_CMD(REPLY_STATISTICS_CMD);
  86                 IWL_CMD(STATISTICS_NOTIFICATION);
  87                 IWL_CMD(REPLY_CARD_STATE_CMD);
  88                 IWL_CMD(CARD_STATE_NOTIFICATION);
  89                 IWL_CMD(MISSED_BEACONS_NOTIFICATION);
  90                 IWL_CMD(REPLY_CT_KILL_CONFIG_CMD);
  91                 IWL_CMD(SENSITIVITY_CMD);
  92                 IWL_CMD(REPLY_PHY_CALIBRATION_CMD);
  93                 IWL_CMD(REPLY_RX_PHY_CMD);
  94                 IWL_CMD(REPLY_RX_MPDU_CMD);
  95                 IWL_CMD(REPLY_RX);
  96                 IWL_CMD(REPLY_COMPRESSED_BA);
  97                 IWL_CMD(CALIBRATION_CFG_CMD);
  98                 IWL_CMD(CALIBRATION_RES_NOTIFICATION);
  99                 IWL_CMD(CALIBRATION_COMPLETE_NOTIFICATION);
 100                 IWL_CMD(REPLY_TX_POWER_DBM_CMD);
 101                 IWL_CMD(TEMPERATURE_NOTIFICATION);
 102                 IWL_CMD(TX_ANT_CONFIGURATION_CMD);
 103                 IWL_CMD(REPLY_BT_COEX_PROFILE_NOTIF);
 104                 IWL_CMD(REPLY_BT_COEX_PRIO_TABLE);
 105                 IWL_CMD(REPLY_BT_COEX_PROT_ENV);
 106                 IWL_CMD(REPLY_WIPAN_PARAMS);
 107                 IWL_CMD(REPLY_WIPAN_RXON);
 108                 IWL_CMD(REPLY_WIPAN_RXON_TIMING);
 109                 IWL_CMD(REPLY_WIPAN_RXON_ASSOC);
 110                 IWL_CMD(REPLY_WIPAN_QOS_PARAM);
 111                 IWL_CMD(REPLY_WIPAN_WEPKEY);
 112                 IWL_CMD(REPLY_WIPAN_P2P_CHANNEL_SWITCH);
 113                 IWL_CMD(REPLY_WIPAN_NOA_NOTIFICATION);
 114                 IWL_CMD(REPLY_WIPAN_DEACTIVATION_COMPLETE);
 115                 IWL_CMD(REPLY_WOWLAN_PATTERNS);
 116                 IWL_CMD(REPLY_WOWLAN_WAKEUP_FILTER);
 117                 IWL_CMD(REPLY_WOWLAN_TSC_RSC_PARAMS);
 118                 IWL_CMD(REPLY_WOWLAN_TKIP_PARAMS);
 119                 IWL_CMD(REPLY_WOWLAN_KEK_KCK_MATERIAL);
 120                 IWL_CMD(REPLY_WOWLAN_GET_STATUS);
 121         default:
 122                 return "UNKNOWN";
 123
 124         }
 125 }
 126
 127 /******************************************************************************
 128  *
 129  * Generic RX handler implementations
 130  *
 131  ******************************************************************************/
 132
 133 static int iwl_rx_reply_error(struct iwl_priv *priv,
 134                                struct iwl_rx_mem_buffer *rxb,
 135                                struct iwl_device_cmd *cmd)
 136 {
 137         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 138
 139         IWL_ERR(priv, "Error Reply type 0x%08X cmd %s (0x%02X) "
 140                 "seq 0x%04X ser 0x%08X\n",
 141                 le32_to_cpu(pkt->u.err_resp.error_type),
 142                 get_cmd_string(pkt->u.err_resp.cmd_id),
 143                 pkt->u.err_resp.cmd_id,
 144                 le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num),
 145                 le32_to_cpu(pkt->u.err_resp.error_info));
 146         return 0;
 147 }
 148
 149 static int iwl_rx_csa(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb,
 150                                struct iwl_device_cmd *cmd)
 151 {
 152         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 153         struct iwl_csa_notification *csa = &(pkt->u.csa_notif);
 154         /*
 155          * MULTI-FIXME
 156          * See iwl_mac_channel_switch.
 157          */
 158         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 159         struct iwl_rxon_cmd *rxon = (void *)&ctx->active;
 160
 161         if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->shrd->status))
 162                 return 0;
 163
 164         if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) {
 165                 rxon->channel = csa->channel;
 166                 ctx->staging.channel = csa->channel;
 167                 IWL_DEBUG_11H(priv, "CSA notif: channel %d\n",
 168                               le16_to_cpu(csa->channel));
 169                 iwl_chswitch_done(priv, true);
 170         } else {
 171                 IWL_ERR(priv, "CSA notif (fail) : channel %d\n",
 172                         le16_to_cpu(csa->channel));
 173                 iwl_chswitch_done(priv, false);
 174         }
 175         return 0;
 176 }
 177
 178
 179 static int iwl_rx_spectrum_measure_notif(struct iwl_priv *priv,
 180                                           struct iwl_rx_mem_buffer *rxb,
 181                                           struct iwl_device_cmd *cmd)
 182 {
 183         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 184         struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif);
 185
 186         if (!report->state) {
 187                 IWL_DEBUG_11H(priv,
 188                         "Spectrum Measure Notification: Start\n");
 189                 return 0;
 190         }
 191
 192         memcpy(&priv->measure_report, report, sizeof(*report));
 193         priv->measurement_status |= MEASUREMENT_READY;
 194         return 0;
 195 }
 196
 197 static int iwl_rx_pm_sleep_notif(struct iwl_priv *priv,
 198                                   struct iwl_rx_mem_buffer *rxb,
 199                                   struct iwl_device_cmd *cmd)
 200 {
 201 #ifdef CONFIG_IWLWIFI_DEBUG
 202         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 203         struct iwl_sleep_notification *sleep = &(pkt->u.sleep_notif);
 204         IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n",
 205                      sleep->pm_sleep_mode, sleep->pm_wakeup_src);
 206 #endif
 207         return 0;
 208 }
 209
 210 static int iwl_rx_pm_debug_statistics_notif(struct iwl_priv *priv,
 211                                              struct iwl_rx_mem_buffer *rxb,
 212                                              struct iwl_device_cmd *cmd)
 213 {
 214         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 215         u32 __maybe_unused len =
 216                 le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
 217         IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled "
 218                         "notification for %s:\n", len,
 219                         get_cmd_string(pkt->hdr.cmd));
 220         iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->u.raw, len);
 221         return 0;
 222 }
 223
 224 static int iwl_rx_beacon_notif(struct iwl_priv *priv,
 225                                 struct iwl_rx_mem_buffer *rxb,
 226                                 struct iwl_device_cmd *cmd)
 227 {
 228         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 229         struct iwlagn_beacon_notif *beacon = (void *)pkt->u.raw;
 230 #ifdef CONFIG_IWLWIFI_DEBUG
 231         u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status);
 232         u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);
 233
 234         IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d "
 235                 "tsf:0x%.8x%.8x rate:%d\n",
 236                 status & TX_STATUS_MSK,
 237                 beacon->beacon_notify_hdr.failure_frame,
 238                 le32_to_cpu(beacon->ibss_mgr_status),
 239                 le32_to_cpu(beacon->high_tsf),
 240                 le32_to_cpu(beacon->low_tsf), rate);
 241 #endif
 242
 243         priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);
 244
 245         if (!test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
 246                 queue_work(priv->shrd->workqueue, &priv->beacon_update);
 247         return 0;
 248 }
 249
 250 /* the threshold ratio of actual_ack_cnt to expected_ack_cnt in percent */
 251 #define ACK_CNT_RATIO (50)
 252 #define BA_TIMEOUT_CNT (5)
 253 #define BA_TIMEOUT_MAX (16)
 254
 255 /**
 256  * iwl_good_ack_health - checks for ACK count ratios, BA timeout retries.
 257  *
 258  * When the ACK count ratio is low and aggregated BA timeout retries exceeding
 259  * the BA_TIMEOUT_MAX, reload firmware and bring system back to normal
 260  * operation state.
 261  */
 262 static bool iwl_good_ack_health(struct iwl_priv *priv,
 263                                 struct statistics_tx *cur)
 264 {
 265         int actual_delta, expected_delta, ba_timeout_delta;
 266         struct statistics_tx *old;
 267
 268         if (priv->agg_tids_count)
 269                 return true;
 270
 271         old = &priv->statistics.tx;
 272
 273         actual_delta = le32_to_cpu(cur->actual_ack_cnt) -
 274                        le32_to_cpu(old->actual_ack_cnt);
 275         expected_delta = le32_to_cpu(cur->expected_ack_cnt) -
 276                          le32_to_cpu(old->expected_ack_cnt);
 277
 278         /* Values should not be negative, but we do not trust the firmware */
 279         if (actual_delta <= 0 || expected_delta <= 0)
 280                 return true;
 281
 282         ba_timeout_delta = le32_to_cpu(cur->agg.ba_timeout) -
 283                            le32_to_cpu(old->agg.ba_timeout);
 284
 285         if ((actual_delta * 100 / expected_delta) < ACK_CNT_RATIO &&
 286             ba_timeout_delta > BA_TIMEOUT_CNT) {
 287                 IWL_DEBUG_RADIO(priv, "deltas: actual %d expected %d ba_timeout %d\n",
 288                                 actual_delta, expected_delta, ba_timeout_delta);
 289
 290 #ifdef CONFIG_IWLWIFI_DEBUGFS
 291                 /*
 292                  * This is ifdef'ed on DEBUGFS because otherwise the
 293                  * statistics aren't available. If DEBUGFS is set but
 294                  * DEBUG is not, these will just compile out.
 295                  */
 296                 IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta %d\n",
 297                                 priv->delta_stats.tx.rx_detected_cnt);
 298                 IWL_DEBUG_RADIO(priv,
 299                                 "ack_or_ba_timeout_collision delta %d\n",
 300                                 priv->delta_stats.tx.ack_or_ba_timeout_collision);
 301 #endif
 302
 303                 if (ba_timeout_delta >= BA_TIMEOUT_MAX)
 304                         return false;
 305         }
 306
 307         return true;
 308 }
 309
 310 /**
 311  * iwl_good_plcp_health - checks for plcp error.
 312  *
 313  * When the plcp error is exceeding the thresholds, reset the radio
 314  * to improve the throughput.
 315  */
 316 static bool iwl_good_plcp_health(struct iwl_priv *priv,
 317                                  struct statistics_rx_phy *cur_ofdm,
 318                                  struct statistics_rx_ht_phy *cur_ofdm_ht,
 319                                  unsigned int msecs)
 320 {
 321         int delta;
 322         int threshold = priv->cfg->base_params->plcp_delta_threshold;
 323
 324         if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
 325                 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
 326                 return true;
 327         }
 328
 329         delta = le32_to_cpu(cur_ofdm->plcp_err) -
 330                 le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) +
 331                 le32_to_cpu(cur_ofdm_ht->plcp_err) -
 332                 le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err);
 333
 334         /* Can be negative if firmware reset statistics */
 335         if (delta <= 0)
 336                 return true;
 337
 338         if ((delta * 100 / msecs) > threshold) {
 339                 IWL_DEBUG_RADIO(priv,
 340                                 "plcp health threshold %u delta %d msecs %u\n",
 341                                 threshold, delta, msecs);
 342                 return false;
 343         }
 344
 345         return true;
 346 }
 347
 348 static void iwl_recover_from_statistics(struct iwl_priv *priv,
 349                                         struct statistics_rx_phy *cur_ofdm,
 350                                         struct statistics_rx_ht_phy *cur_ofdm_ht,
 351                                         struct statistics_tx *tx,
 352                                         unsigned long stamp)
 353 {
 354         unsigned int msecs;
 355
 356         if (test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
 357                 return;
 358
 359         msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies);
 360
 361         /* Only gather statistics and update time stamp when not associated */
 362         if (!iwl_is_any_associated(priv))
 363                 return;
 364
 365         /* Do not check/recover when do not have enough statistics data */
 366         if (msecs < 99)
 367                 return;
 368
 369         if (iwlagn_mod_params.ack_check && !iwl_good_ack_health(priv, tx)) {
 370                 IWL_ERR(priv, "low ack count detected, restart firmware\n");
 371                 if (!iwl_force_reset(priv, IWL_FW_RESET, false))
 372                         return;
 373         }
 374
 375         if (iwlagn_mod_params.plcp_check &&
 376             !iwl_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs))
 377                 iwl_force_reset(priv, IWL_RF_RESET, false);
 378 }
 379
 380 /* Calculate noise level, based on measurements during network silence just
 381  *   before arriving beacon.  This measurement can be done only if we know
 382  *   exactly when to expect beacons, therefore only when we're associated. */
 383 static void iwl_rx_calc_noise(struct iwl_priv *priv)
 384 {
 385         struct statistics_rx_non_phy *rx_info;
 386         int num_active_rx = 0;
 387         int total_silence = 0;
 388         int bcn_silence_a, bcn_silence_b, bcn_silence_c;
 389         int last_rx_noise;
 390
 391         rx_info = &priv->statistics.rx_non_phy;
 392
 393         bcn_silence_a =
 394                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 395         bcn_silence_b =
 396                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 397         bcn_silence_c =
 398                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 399
 400         if (bcn_silence_a) {
 401                 total_silence += bcn_silence_a;
 402                 num_active_rx++;
 403         }
 404         if (bcn_silence_b) {
 405                 total_silence += bcn_silence_b;
 406                 num_active_rx++;
 407         }
 408         if (bcn_silence_c) {
 409                 total_silence += bcn_silence_c;
 410                 num_active_rx++;
 411         }
 412
 413         /* Average among active antennas */
 414         if (num_active_rx)
 415                 last_rx_noise = (total_silence / num_active_rx) - 107;
 416         else
 417                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 418
 419         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 420                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 421                         last_rx_noise);
 422 }
 423
 424 #ifdef CONFIG_IWLWIFI_DEBUGFS
 425 /*
 426  *  based on the assumption of all statistics counter are in DWORD
 427  *  FIXME: This function is for debugging, do not deal with
 428  *  the case of counters roll-over.
 429  */
 430 static void accum_stats(__le32 *prev, __le32 *cur, __le32 *delta,
 431                         __le32 *max_delta, __le32 *accum, int size)
 432 {
 433         int i;
 434
 435         for (i = 0;
 436              i < size / sizeof(__le32);
 437              i++, prev++, cur++, delta++, max_delta++, accum++) {
 438                 if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) {
 439                         *delta = cpu_to_le32(
 440                                 le32_to_cpu(*cur) - le32_to_cpu(*prev));
 441                         le32_add_cpu(accum, le32_to_cpu(*delta));
 442                         if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta))
 443                                 *max_delta = *delta;
 444                 }
 445         }
 446 }
 447
 448 static void
 449 iwl_accumulative_statistics(struct iwl_priv *priv,
 450                             struct statistics_general_common *common,
 451                             struct statistics_rx_non_phy *rx_non_phy,
 452                             struct statistics_rx_phy *rx_ofdm,
 453                             struct statistics_rx_ht_phy *rx_ofdm_ht,
 454                             struct statistics_rx_phy *rx_cck,
 455                             struct statistics_tx *tx,
 456                             struct statistics_bt_activity *bt_activity)
 457 {
 458 #define ACCUM(_name)    \
 459         accum_stats((__le32 *)&priv->statistics._name,          \
 460                     (__le32 *)_name,                            \
 461                     (__le32 *)&priv->delta_stats._name,         \
 462                     (__le32 *)&priv->max_delta_stats._name,     \
 463                     (__le32 *)&priv->accum_stats._name,         \
 464                     sizeof(*_name));
 465
 466         ACCUM(common);
 467         ACCUM(rx_non_phy);
 468         ACCUM(rx_ofdm);
 469         ACCUM(rx_ofdm_ht);
 470         ACCUM(rx_cck);
 471         ACCUM(tx);
 472         if (bt_activity)
 473                 ACCUM(bt_activity);
 474 #undef ACCUM
 475 }
 476 #else
 477 static inline void
 478 iwl_accumulative_statistics(struct iwl_priv *priv,
 479                             struct statistics_general_common *common,
 480                             struct statistics_rx_non_phy *rx_non_phy,
 481                             struct statistics_rx_phy *rx_ofdm,
 482                             struct statistics_rx_ht_phy *rx_ofdm_ht,
 483                             struct statistics_rx_phy *rx_cck,
 484                             struct statistics_tx *tx,
 485                             struct statistics_bt_activity *bt_activity)
 486 {
 487 }
 488 #endif
 489
 490 static int iwl_rx_statistics(struct iwl_priv *priv,
 491                               struct iwl_rx_mem_buffer *rxb,
 492                               struct iwl_device_cmd *cmd)
 493 {
 494         unsigned long stamp = jiffies;
 495         const int reg_recalib_period = 60;
 496         int change;
 497         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 498         u32 len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
 499         __le32 *flag;
 500         struct statistics_general_common *common;
 501         struct statistics_rx_non_phy *rx_non_phy;
 502         struct statistics_rx_phy *rx_ofdm;
 503         struct statistics_rx_ht_phy *rx_ofdm_ht;
 504         struct statistics_rx_phy *rx_cck;
 505         struct statistics_tx *tx;
 506         struct statistics_bt_activity *bt_activity;
 507
 508         len -= sizeof(struct iwl_cmd_header); /* skip header */
 509
 510         IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n",
 511                      len);
 512
 513         if (len == sizeof(struct iwl_bt_notif_statistics)) {
 514                 struct iwl_bt_notif_statistics *stats;
 515                 stats = &pkt->u.stats_bt;
 516                 flag = &stats->flag;
 517                 common = &stats->general.common;
 518                 rx_non_phy = &stats->rx.general.common;
 519                 rx_ofdm = &stats->rx.ofdm;
 520                 rx_ofdm_ht = &stats->rx.ofdm_ht;
 521                 rx_cck = &stats->rx.cck;
 522                 tx = &stats->tx;
 523                 bt_activity = &stats->general.activity;
 524
 525 #ifdef CONFIG_IWLWIFI_DEBUGFS
 526                 /* handle this exception directly */
 527                 priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills;
 528                 le32_add_cpu(&priv->statistics.accum_num_bt_kills,
 529                              le32_to_cpu(stats->rx.general.num_bt_kills));
 530 #endif
 531         } else if (len == sizeof(struct iwl_notif_statistics)) {
 532                 struct iwl_notif_statistics *stats;
 533                 stats = &pkt->u.stats;
 534                 flag = &stats->flag;
 535                 common = &stats->general.common;
 536                 rx_non_phy = &stats->rx.general;
 537                 rx_ofdm = &stats->rx.ofdm;
 538                 rx_ofdm_ht = &stats->rx.ofdm_ht;
 539                 rx_cck = &stats->rx.cck;
 540                 tx = &stats->tx;
 541                 bt_activity = NULL;
 542         } else {
 543                 WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n",
 544                           len, sizeof(struct iwl_bt_notif_statistics),
 545                           sizeof(struct iwl_notif_statistics));
 546                 return 0;
 547         }
 548
 549         change = common->temperature != priv->statistics.common.temperature ||
 550                  (*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 551                  (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK);
 552
 553         iwl_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm,
 554                                     rx_ofdm_ht, rx_cck, tx, bt_activity);
 555
 556         iwl_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp);
 557
 558         priv->statistics.flag = *flag;
 559         memcpy(&priv->statistics.common, common, sizeof(*common));
 560         memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy));
 561         memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm));
 562         memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht));
 563         memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck));
 564         memcpy(&priv->statistics.tx, tx, sizeof(*tx));
 565 #ifdef CONFIG_IWLWIFI_DEBUGFS
 566         if (bt_activity)
 567                 memcpy(&priv->statistics.bt_activity, bt_activity,
 568                         sizeof(*bt_activity));
 569 #endif
 570
 571         priv->rx_statistics_jiffies = stamp;
 572
 573         set_bit(STATUS_STATISTICS, &priv->shrd->status);
 574
 575         /* Reschedule the statistics timer to occur in
 576          * reg_recalib_period seconds to ensure we get a
 577          * thermal update even if the uCode doesn't give
 578          * us one */
 579         mod_timer(&priv->statistics_periodic, jiffies +
 580                   msecs_to_jiffies(reg_recalib_period * 1000));
 581
 582         if (unlikely(!test_bit(STATUS_SCANNING, &priv->shrd->status)) &&
 583             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 584                 iwl_rx_calc_noise(priv);
 585                 queue_work(priv->shrd->workqueue, &priv->run_time_calib_work);
 586         }
 587         if (priv->cfg->lib->temperature && change)
 588                 priv->cfg->lib->temperature(priv);
 589         return 0;
 590 }
 591
 592 static int iwl_rx_reply_statistics(struct iwl_priv *priv,
 593                                     struct iwl_rx_mem_buffer *rxb,
 594                                     struct iwl_device_cmd *cmd)
 595 {
 596         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 597
 598         if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
 599 #ifdef CONFIG_IWLWIFI_DEBUGFS
 600                 memset(&priv->accum_stats, 0,
 601                         sizeof(priv->accum_stats));
 602                 memset(&priv->delta_stats, 0,
 603                         sizeof(priv->delta_stats));
 604                 memset(&priv->max_delta_stats, 0,
 605                         sizeof(priv->max_delta_stats));
 606 #endif
 607                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 608         }
 609         iwl_rx_statistics(priv, rxb, cmd);
 610         return 0;
 611 }
 612
 613 /* Handle notification from uCode that card's power state is changing
 614  * due to software, hardware, or critical temperature RFKILL */
 615 static int iwl_rx_card_state_notif(struct iwl_priv *priv,
 616                                     struct iwl_rx_mem_buffer *rxb,
 617                                     struct iwl_device_cmd *cmd)
 618 {
 619         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 620         u32 flags = le32_to_cpu(pkt->u.card_state_notif.flags);
 621         unsigned long status = priv->shrd->status;
 622
 623         IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
 624                           (flags & HW_CARD_DISABLED) ? "Kill" : "On",
 625                           (flags & SW_CARD_DISABLED) ? "Kill" : "On",
 626                           (flags & CT_CARD_DISABLED) ?
 627                           "Reached" : "Not reached");
 628
 629         if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
 630                      CT_CARD_DISABLED)) {
 631
 632                 iwl_write32(bus(priv), CSR_UCODE_DRV_GP1_SET,
 633                             CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 634
 635                 iwl_write_direct32(bus(priv), HBUS_TARG_MBX_C,
 636                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 637
 638                 if (!(flags & RXON_CARD_DISABLED)) {
 639                         iwl_write32(bus(priv), CSR_UCODE_DRV_GP1_CLR,
 640                                     CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 641                         iwl_write_direct32(bus(priv), HBUS_TARG_MBX_C,
 642                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 643                 }
 644                 if (flags & CT_CARD_DISABLED)
 645                         iwl_tt_enter_ct_kill(priv);
 646         }
 647         if (!(flags & CT_CARD_DISABLED))
 648                 iwl_tt_exit_ct_kill(priv);
 649
 650         if (flags & HW_CARD_DISABLED)
 651                 set_bit(STATUS_RF_KILL_HW, &priv->shrd->status);
 652         else
 653                 clear_bit(STATUS_RF_KILL_HW, &priv->shrd->status);
 654
 655
 656         if (!(flags & RXON_CARD_DISABLED))
 657                 iwl_scan_cancel(priv);
 658
 659         if ((test_bit(STATUS_RF_KILL_HW, &status) !=
 660              test_bit(STATUS_RF_KILL_HW, &priv->shrd->status)))
 661                 wiphy_rfkill_set_hw_state(priv->hw->wiphy,
 662                         test_bit(STATUS_RF_KILL_HW, &priv->shrd->status));
 663         else
 664                 wake_up(&priv->shrd->wait_command_queue);
 665         return 0;
 666 }
 667
 668 static int iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
 669                                        struct iwl_rx_mem_buffer *rxb,
 670                                        struct iwl_device_cmd *cmd)
 671
 672 {
 673         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 674         struct iwl_missed_beacon_notif *missed_beacon;
 675
 676         missed_beacon = &pkt->u.missed_beacon;
 677         if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
 678             priv->missed_beacon_threshold) {
 679                 IWL_DEBUG_CALIB(priv,
 680                     "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 681                     le32_to_cpu(missed_beacon->consecutive_missed_beacons),
 682                     le32_to_cpu(missed_beacon->total_missed_becons),
 683                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 684                     le32_to_cpu(missed_beacon->num_expected_beacons));
 685                 if (!test_bit(STATUS_SCANNING, &priv->shrd->status))
 686                         iwl_init_sensitivity(priv);
 687         }
 688         return 0;
 689 }
 690
 691 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
 692  * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
 693 static int iwl_rx_reply_rx_phy(struct iwl_priv *priv,
 694                                 struct iwl_rx_mem_buffer *rxb,
 695                                 struct iwl_device_cmd *cmd)
 696 {
 697         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 698
 699         priv->last_phy_res_valid = true;
 700         memcpy(&priv->last_phy_res, pkt->u.raw,
 701                sizeof(struct iwl_rx_phy_res));
 702         return 0;
 703 }
 704
 705 /*
 706  * returns non-zero if packet should be dropped
 707  */
 708 static int iwl_set_decrypted_flag(struct iwl_priv *priv,
 709                                   struct ieee80211_hdr *hdr,
 710                                   u32 decrypt_res,
 711                                   struct ieee80211_rx_status *stats)
 712 {
 713         u16 fc = le16_to_cpu(hdr->frame_control);
 714
 715         /*
 716          * All contexts have the same setting here due to it being
 717          * a module parameter, so OK to check any context.
 718          */
 719         if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags &
 720                                                 RXON_FILTER_DIS_DECRYPT_MSK)
 721                 return 0;
 722
 723         if (!(fc & IEEE80211_FCTL_PROTECTED))
 724                 return 0;
 725
 726         IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
 727         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 728         case RX_RES_STATUS_SEC_TYPE_TKIP:
 729                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 730                  * Decryption will be done in SW. */
 731                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 732                     RX_RES_STATUS_BAD_KEY_TTAK)
 733                         break;
 734
 735         case RX_RES_STATUS_SEC_TYPE_WEP:
 736                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 737                     RX_RES_STATUS_BAD_ICV_MIC) {
 738                         /* bad ICV, the packet is destroyed since the
 739                          * decryption is inplace, drop it */
 740                         IWL_DEBUG_RX(priv, "Packet destroyed\n");
 741                         return -1;
 742                 }
 743         case RX_RES_STATUS_SEC_TYPE_CCMP:
 744                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 745                     RX_RES_STATUS_DECRYPT_OK) {
 746                         IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
 747                         stats->flag |= RX_FLAG_DECRYPTED;
 748                 }
 749                 break;
 750
 751         default:
 752                 break;
 753         }
 754         return 0;
 755 }
 756
 757 static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 758                                         struct ieee80211_hdr *hdr,
 759                                         u16 len,
 760                                         u32 ampdu_status,
 761                                         struct iwl_rx_mem_buffer *rxb,
 762                                         struct ieee80211_rx_status *stats)
 763 {
 764         struct sk_buff *skb;
 765         __le16 fc = hdr->frame_control;
 766         struct iwl_rxon_context *ctx;
 767
 768         /* We only process data packets if the interface is open */
 769         if (unlikely(!priv->is_open)) {
 770                 IWL_DEBUG_DROP_LIMIT(priv,
 771                     "Dropping packet while interface is not open.\n");
 772                 return;
 773         }
 774
 775         /* In case of HW accelerated crypto and bad decryption, drop */
 776         if (!iwlagn_mod_params.sw_crypto &&
 777             iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
 778                 return;
 779
 780         skb = dev_alloc_skb(128);
 781         if (!skb) {
 782                 IWL_ERR(priv, "dev_alloc_skb failed\n");
 783                 return;
 784         }
 785
 786         skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
 787
 788         iwl_update_stats(priv, false, fc, len);
 789
 790         /*
 791         * Wake any queues that were stopped due to a passive channel tx
 792         * failure. This can happen because the regulatory enforcement in
 793         * the device waits for a beacon before allowing transmission,
 794         * sometimes even after already having transmitted frames for the
 795         * association because the new RXON may reset the information.
 796         */
 797         if (unlikely(ieee80211_is_beacon(fc))) {
 798                 for_each_context(priv, ctx) {
 799                         if (!ctx->last_tx_rejected)
 800                                 continue;
 801                         if (compare_ether_addr(hdr->addr3,
 802                                                ctx->active.bssid_addr))
 803                                 continue;
 804                         ctx->last_tx_rejected = false;
 805                         iwl_trans_wake_any_queue(trans(priv), ctx->ctxid);
 806                 }
 807         }
 808
 809         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
 810
 811         ieee80211_rx(priv->hw, skb);
 812         rxb->page = NULL;
 813 }
 814
 815 static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
 816 {
 817         u32 decrypt_out = 0;
 818
 819         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
 820                                         RX_RES_STATUS_STATION_FOUND)
 821                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
 822                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
 823
 824         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
 825
 826         /* packet was not encrypted */
 827         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 828                                         RX_RES_STATUS_SEC_TYPE_NONE)
 829                 return decrypt_out;
 830
 831         /* packet was encrypted with unknown alg */
 832         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 833                                         RX_RES_STATUS_SEC_TYPE_ERR)
 834                 return decrypt_out;
 835
 836         /* decryption was not done in HW */
 837         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
 838                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
 839                 return decrypt_out;
 840
 841         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
 842
 843         case RX_RES_STATUS_SEC_TYPE_CCMP:
 844                 /* alg is CCM: check MIC only */
 845                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
 846                         /* Bad MIC */
 847                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 848                 else
 849                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 850
 851                 break;
 852
 853         case RX_RES_STATUS_SEC_TYPE_TKIP:
 854                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
 855                         /* Bad TTAK */
 856                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
 857                         break;
 858                 }
 859                 /* fall through if TTAK OK */
 860         default:
 861                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
 862                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 863                 else
 864                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 865                 break;
 866         }
 867
 868         IWL_DEBUG_RX(priv, "decrypt_in:0x%x  decrypt_out = 0x%x\n",
 869                                         decrypt_in, decrypt_out);
 870
 871         return decrypt_out;
 872 }
 873
 874 /* Calc max signal level (dBm) among 3 possible receivers */
 875 static int iwlagn_calc_rssi(struct iwl_priv *priv,
 876                              struct iwl_rx_phy_res *rx_resp)
 877 {
 878         /* data from PHY/DSP regarding signal strength, etc.,
 879          *   contents are always there, not configurable by host
 880          */
 881         struct iwlagn_non_cfg_phy *ncphy =
 882                 (struct iwlagn_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
 883         u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
 884         u8 agc;
 885
 886         val  = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_AGC_IDX]);
 887         agc = (val & IWLAGN_OFDM_AGC_MSK) >> IWLAGN_OFDM_AGC_BIT_POS;
 888
 889         /* Find max rssi among 3 possible receivers.
 890          * These values are measured by the digital signal processor (DSP).
 891          * They should stay fairly constant even as the signal strength varies,
 892          *   if the radio's automatic gain control (AGC) is working right.
 893          * AGC value (see below) will provide the "interesting" info.
 894          */
 895         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_AB_IDX]);
 896         rssi_a = (val & IWLAGN_OFDM_RSSI_INBAND_A_BITMSK) >>
 897                 IWLAGN_OFDM_RSSI_A_BIT_POS;
 898         rssi_b = (val & IWLAGN_OFDM_RSSI_INBAND_B_BITMSK) >>
 899                 IWLAGN_OFDM_RSSI_B_BIT_POS;
 900         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_C_IDX]);
 901         rssi_c = (val & IWLAGN_OFDM_RSSI_INBAND_C_BITMSK) >>
 902                 IWLAGN_OFDM_RSSI_C_BIT_POS;
 903
 904         max_rssi = max_t(u32, rssi_a, rssi_b);
 905         max_rssi = max_t(u32, max_rssi, rssi_c);
 906
 907         IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
 908                 rssi_a, rssi_b, rssi_c, max_rssi, agc);
 909
 910         /* dBm = max_rssi dB - agc dB - constant.
 911          * Higher AGC (higher radio gain) means lower signal. */
 912         return max_rssi - agc - IWLAGN_RSSI_OFFSET;
 913 }
 914
 915 /* Called for REPLY_RX (legacy ABG frames), or
 916  * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
 917 static int iwl_rx_reply_rx(struct iwl_priv *priv,
 918                             struct iwl_rx_mem_buffer *rxb,
 919                             struct iwl_device_cmd *cmd)
 920 {
 921         struct ieee80211_hdr *header;
 922         struct ieee80211_rx_status rx_status;
 923         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 924         struct iwl_rx_phy_res *phy_res;
 925         __le32 rx_pkt_status;
 926         struct iwl_rx_mpdu_res_start *amsdu;
 927         u32 len;
 928         u32 ampdu_status;
 929         u32 rate_n_flags;
 930
 931         /**
 932          * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
 933          *      REPLY_RX: physical layer info is in this buffer
 934          *      REPLY_RX_MPDU_CMD: physical layer info was sent in separate
 935          *              command and cached in priv->last_phy_res
 936          *
 937          * Here we set up local variables depending on which command is
 938          * received.
 939          */
 940         if (pkt->hdr.cmd == REPLY_RX) {
 941                 phy_res = (struct iwl_rx_phy_res *)pkt->u.raw;
 942                 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res)
 943                                 + phy_res->cfg_phy_cnt);
 944
 945                 len = le16_to_cpu(phy_res->byte_count);
 946                 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) +
 947                                 phy_res->cfg_phy_cnt + len);
 948                 ampdu_status = le32_to_cpu(rx_pkt_status);
 949         } else {
 950                 if (!priv->last_phy_res_valid) {
 951                         IWL_ERR(priv, "MPDU frame without cached PHY data\n");
 952                         return 0;
 953                 }
 954                 phy_res = &priv->last_phy_res;
 955                 amsdu = (struct iwl_rx_mpdu_res_start *)pkt->u.raw;
 956                 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu));
 957                 len = le16_to_cpu(amsdu->byte_count);
 958                 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len);
 959                 ampdu_status = iwl_translate_rx_status(priv,
 960                                                 le32_to_cpu(rx_pkt_status));
 961         }
 962
 963         if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
 964                 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n",
 965                                 phy_res->cfg_phy_cnt);
 966                 return 0;
 967         }
 968
 969         if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
 970             !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
 971                 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
 972                                 le32_to_cpu(rx_pkt_status));
 973                 return 0;
 974         }
 975
 976         /* This will be used in several places later */
 977         rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
 978
 979         /* rx_status carries information about the packet to mac80211 */
 980         rx_status.mactime = le64_to_cpu(phy_res->timestamp);
 981         rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
 982                                 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 983         rx_status.freq =
 984                 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel),
 985                                                rx_status.band);
 986         rx_status.rate_idx =
 987                 iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
 988         rx_status.flag = 0;
 989
 990         /* TSF isn't reliable. In order to allow smooth user experience,
 991          * this W/A doesn't propagate it to the mac80211 */
 992         /*rx_status.flag |= RX_FLAG_MACTIME_MPDU;*/
 993
 994         priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
 995
 996         /* Find max signal strength (dBm) among 3 antenna/receiver chains */
 997         rx_status.signal = iwlagn_calc_rssi(priv, phy_res);
 998
 999         iwl_dbg_log_rx_data_frame(priv, len, header);
1000         IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n",
1001                 rx_status.signal, (unsigned long long)rx_status.mactime);
1002
1003         /*
1004          * "antenna number"
1005          *
1006          * It seems that the antenna field in the phy flags value
1007          * is actually a bit field. This is undefined by radiotap,
1008          * it wants an actual antenna number but I always get "7"
1009          * for most legacy frames I receive indicating that the
1010          * same frame was received on all three RX chains.
1011          *
1012          * I think this field should be removed in favor of a
1013          * new 802.11n radiotap field "RX chains" that is defined
1014          * as a bitmask.
1015          */
1016         rx_status.antenna =
1017                 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
1018                 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
1019
1020         /* set the preamble flag if appropriate */
1021         if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
1022                 rx_status.flag |= RX_FLAG_SHORTPRE;
1023
1024         /* Set up the HT phy flags */
1025         if (rate_n_flags & RATE_MCS_HT_MSK)
1026                 rx_status.flag |= RX_FLAG_HT;
1027         if (rate_n_flags & RATE_MCS_HT40_MSK)
1028                 rx_status.flag |= RX_FLAG_40MHZ;
1029         if (rate_n_flags & RATE_MCS_SGI_MSK)
1030                 rx_status.flag |= RX_FLAG_SHORT_GI;
1031
1032         iwl_pass_packet_to_mac80211(priv, header, len, ampdu_status,
1033                                     rxb, &rx_status);
1034         return 0;
1035 }
1036
1037 /**
1038  * iwl_setup_rx_handlers - Initialize Rx handler callbacks
1039  *
1040  * Setup the RX handlers for each of the reply types sent from the uCode
1041  * to the host.
1042  */
1043 void iwl_setup_rx_handlers(struct iwl_priv *priv)
1044 {
1045         int (**handlers)(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb,
1046                                struct iwl_device_cmd *cmd);
1047
1048         handlers = priv->rx_handlers;
1049
1050         handlers[REPLY_ERROR]                   = iwl_rx_reply_error;
1051         handlers[CHANNEL_SWITCH_NOTIFICATION]   = iwl_rx_csa;
1052         handlers[SPECTRUM_MEASURE_NOTIFICATION] = iwl_rx_spectrum_measure_notif;
1053         handlers[PM_SLEEP_NOTIFICATION]         = iwl_rx_pm_sleep_notif;
1054         handlers[PM_DEBUG_STATISTIC_NOTIFIC]    = iwl_rx_pm_debug_statistics_notif;
1055         handlers[BEACON_NOTIFICATION]           = iwl_rx_beacon_notif;
1056         handlers[REPLY_ADD_STA]                 = iwl_add_sta_callback;
1057
1058         /*
1059          * The same handler is used for both the REPLY to a discrete
1060          * statistics request from the host as well as for the periodic
1061          * statistics notifications (after received beacons) from the uCode.
1062          */
1063         handlers[REPLY_STATISTICS_CMD]          = iwl_rx_reply_statistics;
1064         handlers[STATISTICS_NOTIFICATION]       = iwl_rx_statistics;
1065
1066         iwl_setup_rx_scan_handlers(priv);
1067
1068         handlers[CARD_STATE_NOTIFICATION]       = iwl_rx_card_state_notif;
1069         handlers[MISSED_BEACONS_NOTIFICATION]   = iwl_rx_missed_beacon_notif;
1070
1071         /* Rx handlers */
1072         handlers[REPLY_RX_PHY_CMD]              = iwl_rx_reply_rx_phy;
1073         handlers[REPLY_RX_MPDU_CMD]             = iwl_rx_reply_rx;
1074
1075         /* block ack */
1076         handlers[REPLY_COMPRESSED_BA]           = iwlagn_rx_reply_compressed_ba;
1077
1078         /* init calibration handlers */
1079         priv->rx_handlers[CALIBRATION_RES_NOTIFICATION] =
1080                                         iwlagn_rx_calib_result;
1081         priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx;
1082
1083         /* set up notification wait support */
1084         spin_lock_init(&priv->notif_wait_lock);
1085         INIT_LIST_HEAD(&priv->notif_waits);
1086         init_waitqueue_head(&priv->notif_waitq);
1087
1088         /* Set up BT Rx handlers */
1089         if (priv->cfg->lib->bt_rx_handler_setup)
1090                 priv->cfg->lib->bt_rx_handler_setup(priv);
1091
1092 }
1093
1094 int iwl_rx_dispatch(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb,
1095                      struct iwl_device_cmd *cmd)
1096 {
1097         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1098         int err = 0;
1099
1100         /*
1101          * Do the notification wait before RX handlers so
1102          * even if the RX handler consumes the RXB we have
1103          * access to it in the notification wait entry.
1104          */
1105         if (!list_empty(&priv->notif_waits)) {
1106                 struct iwl_notification_wait *w;
1107
1108                 spin_lock(&priv->notif_wait_lock);
1109                 list_for_each_entry(w, &priv->notif_waits, list) {
1110                         if (w->cmd != pkt->hdr.cmd)
1111                                 continue;
1112                         IWL_DEBUG_RX(priv,
1113                                 "Notif: %s, 0x%02x - wake the callers up\n",
1114                                 get_cmd_string(pkt->hdr.cmd),
1115                                 pkt->hdr.cmd);
1116                         w->triggered = true;
1117                         if (w->fn)
1118                                 w->fn(priv, pkt, w->fn_data);
1119                 }
1120                 spin_unlock(&priv->notif_wait_lock);
1121
1122                 wake_up_all(&priv->notif_waitq);
1123         }
1124
1125         if (priv->pre_rx_handler)
1126                 priv->pre_rx_handler(priv, rxb);
1127
1128         /* Based on type of command response or notification,
1129          *   handle those that need handling via function in
1130          *   rx_handlers table.  See iwl_setup_rx_handlers() */
1131         if (priv->rx_handlers[pkt->hdr.cmd]) {
1132                 priv->rx_handlers_stats[pkt->hdr.cmd]++;
1133                 err = priv->rx_handlers[pkt->hdr.cmd] (priv, rxb, cmd);
1134         } else {
1135                 /* No handling needed */
1136                 IWL_DEBUG_RX(priv,
1137                         "No handler needed for %s, 0x%02x\n",
1138                         get_cmd_string(pkt->hdr.cmd), pkt->hdr.cmd);
1139         }
1140         return err;
1141 }