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