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
  44 /******************************************************************************
  45  *
  46  * RX path functions
  47  *
  48  ******************************************************************************/
  49
  50 /*
  51  * Rx theory of operation
  52  *
  53  * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
  54  * each of which point to Receive Buffers to be filled by the NIC.  These get
  55  * used not only for Rx frames, but for any command response or notification
  56  * from the NIC.  The driver and NIC manage the Rx buffers by means
  57  * of indexes into the circular buffer.
  58  *
  59  * Rx Queue Indexes
  60  * The host/firmware share two index registers for managing the Rx buffers.
  61  *
  62  * The READ index maps to the first position that the firmware may be writing
  63  * to -- the driver can read up to (but not including) this position and get
  64  * good data.
  65  * The READ index is managed by the firmware once the card is enabled.
  66  *
  67  * The WRITE index maps to the last position the driver has read from -- the
  68  * position preceding WRITE is the last slot the firmware can place a packet.
  69  *
  70  * The queue is empty (no good data) if WRITE = READ - 1, and is full if
  71  * WRITE = READ.
  72  *
  73  * During initialization, the host sets up the READ queue position to the first
  74  * INDEX position, and WRITE to the last (READ - 1 wrapped)
  75  *
  76  * When the firmware places a packet in a buffer, it will advance the READ index
  77  * and fire the RX interrupt.  The driver can then query the READ index and
  78  * process as many packets as possible, moving the WRITE index forward as it
  79  * resets the Rx queue buffers with new memory.
  80  *
  81  * The management in the driver is as follows:
  82  * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
  83  *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
  84  *   to replenish the iwl->rxq->rx_free.
  85  * + In iwl_rx_replenish (scheduled) if 'processed' != 'read' then the
  86  *   iwl->rxq is replenished and the READ INDEX is updated (updating the
  87  *   'processed' and 'read' driver indexes as well)
  88  * + A received packet is processed and handed to the kernel network stack,
  89  *   detached from the iwl->rxq.  The driver 'processed' index is updated.
  90  * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
  91  *   list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
  92  *   INDEX is not incremented and iwl->status(RX_STALLED) is set.  If there
  93  *   were enough free buffers and RX_STALLED is set it is cleared.
  94  *
  95  *
  96  * Driver sequence:
  97  *
  98  * iwl_rx_queue_alloc()   Allocates rx_free
  99  * iwl_rx_replenish()     Replenishes rx_free list from rx_used, and calls
 100  *                            iwl_rx_queue_restock
 101  * iwl_rx_queue_restock() Moves available buffers from rx_free into Rx
 102  *                            queue, updates firmware pointers, and updates
 103  *                            the WRITE index.  If insufficient rx_free buffers
 104  *                            are available, schedules iwl_rx_replenish
 105  *
 106  * -- enable interrupts --
 107  * ISR - iwl_rx()         Detach iwl_rx_mem_buffers from pool up to the
 108  *                            READ INDEX, detaching the SKB from the pool.
 109  *                            Moves the packet buffer from queue to rx_used.
 110  *                            Calls iwl_rx_queue_restock to refill any empty
 111  *                            slots.
 112  * ...
 113  *
 114  */
 115
 116 /**
 117  * iwl_rx_queue_space - Return number of free slots available in queue.
 118  */
 119 int iwl_rx_queue_space(const struct iwl_rx_queue *q)
 120 {
 121         int s = q->read - q->write;
 122         if (s <= 0)
 123                 s += RX_QUEUE_SIZE;
 124         /* keep some buffer to not confuse full and empty queue */
 125         s -= 2;
 126         if (s < 0)
 127                 s = 0;
 128         return s;
 129 }
 130
 131 /**
 132  * iwl_rx_queue_update_write_ptr - Update the write pointer for the RX queue
 133  */
 134 void iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q)
 135 {
 136         unsigned long flags;
 137         u32 reg;
 138
 139         spin_lock_irqsave(&q->lock, flags);
 140
 141         if (q->need_update == 0)
 142                 goto exit_unlock;
 143
 144         if (priv->cfg->base_params->shadow_reg_enable) {
 145                 /* shadow register enabled */
 146                 /* Device expects a multiple of 8 */
 147                 q->write_actual = (q->write & ~0x7);
 148                 iwl_write32(priv, FH_RSCSR_CHNL0_WPTR, q->write_actual);
 149         } else {
 150                 /* If power-saving is in use, make sure device is awake */
 151                 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
 152                         reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
 153
 154                         if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
 155                                 IWL_DEBUG_INFO(priv,
 156                                         "Rx queue requesting wakeup,"
 157                                         " GP1 = 0x%x\n", reg);
 158                                 iwl_set_bit(priv, CSR_GP_CNTRL,
 159                                         CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 160                                 goto exit_unlock;
 161                         }
 162
 163                         q->write_actual = (q->write & ~0x7);
 164                         iwl_write_direct32(priv, FH_RSCSR_CHNL0_WPTR,
 165                                         q->write_actual);
 166
 167                 /* Else device is assumed to be awake */
 168                 } else {
 169                         /* Device expects a multiple of 8 */
 170                         q->write_actual = (q->write & ~0x7);
 171                         iwl_write_direct32(priv, FH_RSCSR_CHNL0_WPTR,
 172                                 q->write_actual);
 173                 }
 174         }
 175         q->need_update = 0;
 176
 177  exit_unlock:
 178         spin_unlock_irqrestore(&q->lock, flags);
 179 }
 180
 181 /******************************************************************************
 182  *
 183  * Generic RX handler implementations
 184  *
 185  ******************************************************************************/
 186
 187 static void iwl_rx_reply_error(struct iwl_priv *priv,
 188                                struct iwl_rx_mem_buffer *rxb)
 189 {
 190         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 191
 192         IWL_ERR(priv, "Error Reply type 0x%08X cmd %s (0x%02X) "
 193                 "seq 0x%04X ser 0x%08X\n",
 194                 le32_to_cpu(pkt->u.err_resp.error_type),
 195                 get_cmd_string(pkt->u.err_resp.cmd_id),
 196                 pkt->u.err_resp.cmd_id,
 197                 le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num),
 198                 le32_to_cpu(pkt->u.err_resp.error_info));
 199 }
 200
 201 static void iwl_rx_csa(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
 202 {
 203         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 204         struct iwl_csa_notification *csa = &(pkt->u.csa_notif);
 205         /*
 206          * MULTI-FIXME
 207          * See iwl_mac_channel_switch.
 208          */
 209         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 210         struct iwl_rxon_cmd *rxon = (void *)&ctx->active;
 211
 212         if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status))
 213                 return;
 214
 215         if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) {
 216                 rxon->channel = csa->channel;
 217                 ctx->staging.channel = csa->channel;
 218                 IWL_DEBUG_11H(priv, "CSA notif: channel %d\n",
 219                               le16_to_cpu(csa->channel));
 220                 iwl_chswitch_done(priv, true);
 221         } else {
 222                 IWL_ERR(priv, "CSA notif (fail) : channel %d\n",
 223                         le16_to_cpu(csa->channel));
 224                 iwl_chswitch_done(priv, false);
 225         }
 226 }
 227
 228
 229 static void iwl_rx_spectrum_measure_notif(struct iwl_priv *priv,
 230                                           struct iwl_rx_mem_buffer *rxb)
 231 {
 232         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 233         struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif);
 234
 235         if (!report->state) {
 236                 IWL_DEBUG_11H(priv,
 237                         "Spectrum Measure Notification: Start\n");
 238                 return;
 239         }
 240
 241         memcpy(&priv->measure_report, report, sizeof(*report));
 242         priv->measurement_status |= MEASUREMENT_READY;
 243 }
 244
 245 static void iwl_rx_pm_sleep_notif(struct iwl_priv *priv,
 246                                   struct iwl_rx_mem_buffer *rxb)
 247 {
 248 #ifdef CONFIG_IWLWIFI_DEBUG
 249         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 250         struct iwl_sleep_notification *sleep = &(pkt->u.sleep_notif);
 251         IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n",
 252                      sleep->pm_sleep_mode, sleep->pm_wakeup_src);
 253 #endif
 254 }
 255
 256 static void iwl_rx_pm_debug_statistics_notif(struct iwl_priv *priv,
 257                                              struct iwl_rx_mem_buffer *rxb)
 258 {
 259         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 260         u32 len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
 261         IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled "
 262                         "notification for %s:\n", len,
 263                         get_cmd_string(pkt->hdr.cmd));
 264         iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->u.raw, len);
 265 }
 266
 267 static void iwl_rx_beacon_notif(struct iwl_priv *priv,
 268                                 struct iwl_rx_mem_buffer *rxb)
 269 {
 270         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 271         struct iwlagn_beacon_notif *beacon = (void *)pkt->u.raw;
 272 #ifdef CONFIG_IWLWIFI_DEBUG
 273         u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status);
 274         u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);
 275
 276         IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d "
 277                 "tsf:0x%.8x%.8x rate:%d\n",
 278                 status & TX_STATUS_MSK,
 279                 beacon->beacon_notify_hdr.failure_frame,
 280                 le32_to_cpu(beacon->ibss_mgr_status),
 281                 le32_to_cpu(beacon->high_tsf),
 282                 le32_to_cpu(beacon->low_tsf), rate);
 283 #endif
 284
 285         priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);
 286
 287         if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
 288                 queue_work(priv->workqueue, &priv->beacon_update);
 289 }
 290
 291 /* the threshold ratio of actual_ack_cnt to expected_ack_cnt in percent */
 292 #define ACK_CNT_RATIO (50)
 293 #define BA_TIMEOUT_CNT (5)
 294 #define BA_TIMEOUT_MAX (16)
 295
 296 /**
 297  * iwl_good_ack_health - checks for ACK count ratios, BA timeout retries.
 298  *
 299  * When the ACK count ratio is low and aggregated BA timeout retries exceeding
 300  * the BA_TIMEOUT_MAX, reload firmware and bring system back to normal
 301  * operation state.
 302  */
 303 static bool iwl_good_ack_health(struct iwl_priv *priv,
 304                                 struct statistics_tx *cur)
 305 {
 306         int actual_delta, expected_delta, ba_timeout_delta;
 307         struct statistics_tx *old;
 308
 309         if (priv->_agn.agg_tids_count)
 310                 return true;
 311
 312         old = &priv->statistics.tx;
 313
 314         actual_delta = le32_to_cpu(cur->actual_ack_cnt) -
 315                        le32_to_cpu(old->actual_ack_cnt);
 316         expected_delta = le32_to_cpu(cur->expected_ack_cnt) -
 317                          le32_to_cpu(old->expected_ack_cnt);
 318
 319         /* Values should not be negative, but we do not trust the firmware */
 320         if (actual_delta <= 0 || expected_delta <= 0)
 321                 return true;
 322
 323         ba_timeout_delta = le32_to_cpu(cur->agg.ba_timeout) -
 324                            le32_to_cpu(old->agg.ba_timeout);
 325
 326         if ((actual_delta * 100 / expected_delta) < ACK_CNT_RATIO &&
 327             ba_timeout_delta > BA_TIMEOUT_CNT) {
 328                 IWL_DEBUG_RADIO(priv, "deltas: actual %d expected %d ba_timeout %d\n",
 329                                 actual_delta, expected_delta, ba_timeout_delta);
 330
 331 #ifdef CONFIG_IWLWIFI_DEBUGFS
 332                 /*
 333                  * This is ifdef'ed on DEBUGFS because otherwise the
 334                  * statistics aren't available. If DEBUGFS is set but
 335                  * DEBUG is not, these will just compile out.
 336                  */
 337                 IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta %d\n",
 338                                 priv->delta_stats.tx.rx_detected_cnt);
 339                 IWL_DEBUG_RADIO(priv,
 340                                 "ack_or_ba_timeout_collision delta %d\n",
 341                                 priv->delta_stats.tx.ack_or_ba_timeout_collision);
 342 #endif
 343
 344                 if (ba_timeout_delta >= BA_TIMEOUT_MAX)
 345                         return false;
 346         }
 347
 348         return true;
 349 }
 350
 351 /**
 352  * iwl_good_plcp_health - checks for plcp error.
 353  *
 354  * When the plcp error is exceeding the thresholds, reset the radio
 355  * to improve the throughput.
 356  */
 357 static bool iwl_good_plcp_health(struct iwl_priv *priv,
 358                                  struct statistics_rx_phy *cur_ofdm,
 359                                  struct statistics_rx_ht_phy *cur_ofdm_ht,
 360                                  unsigned int msecs)
 361 {
 362         int delta;
 363         int threshold = priv->cfg->base_params->plcp_delta_threshold;
 364
 365         if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
 366                 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
 367                 return true;
 368         }
 369
 370         delta = le32_to_cpu(cur_ofdm->plcp_err) -
 371                 le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) +
 372                 le32_to_cpu(cur_ofdm_ht->plcp_err) -
 373                 le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err);
 374
 375         /* Can be negative if firmware reset statistics */
 376         if (delta <= 0)
 377                 return true;
 378
 379         if ((delta * 100 / msecs) > threshold) {
 380                 IWL_DEBUG_RADIO(priv,
 381                                 "plcp health threshold %u delta %d msecs %u\n",
 382                                 threshold, delta, msecs);
 383                 return false;
 384         }
 385
 386         return true;
 387 }
 388
 389 static void iwl_recover_from_statistics(struct iwl_priv *priv,
 390                                         struct statistics_rx_phy *cur_ofdm,
 391                                         struct statistics_rx_ht_phy *cur_ofdm_ht,
 392                                         struct statistics_tx *tx,
 393                                         unsigned long stamp)
 394 {
 395         unsigned int msecs;
 396
 397         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 398                 return;
 399
 400         msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies);
 401
 402         /* Only gather statistics and update time stamp when not associated */
 403         if (!iwl_is_any_associated(priv))
 404                 return;
 405
 406         /* Do not check/recover when do not have enough statistics data */
 407         if (msecs < 99)
 408                 return;
 409
 410         if (iwlagn_mod_params.ack_check && !iwl_good_ack_health(priv, tx)) {
 411                 IWL_ERR(priv, "low ack count detected, restart firmware\n");
 412                 if (!iwl_force_reset(priv, IWL_FW_RESET, false))
 413                         return;
 414         }
 415
 416         if (iwlagn_mod_params.plcp_check &&
 417             !iwl_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs))
 418                 iwl_force_reset(priv, IWL_RF_RESET, false);
 419 }
 420
 421 /* Calculate noise level, based on measurements during network silence just
 422  *   before arriving beacon.  This measurement can be done only if we know
 423  *   exactly when to expect beacons, therefore only when we're associated. */
 424 static void iwl_rx_calc_noise(struct iwl_priv *priv)
 425 {
 426         struct statistics_rx_non_phy *rx_info;
 427         int num_active_rx = 0;
 428         int total_silence = 0;
 429         int bcn_silence_a, bcn_silence_b, bcn_silence_c;
 430         int last_rx_noise;
 431
 432         rx_info = &priv->statistics.rx_non_phy;
 433
 434         bcn_silence_a =
 435                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 436         bcn_silence_b =
 437                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 438         bcn_silence_c =
 439                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 440
 441         if (bcn_silence_a) {
 442                 total_silence += bcn_silence_a;
 443                 num_active_rx++;
 444         }
 445         if (bcn_silence_b) {
 446                 total_silence += bcn_silence_b;
 447                 num_active_rx++;
 448         }
 449         if (bcn_silence_c) {
 450                 total_silence += bcn_silence_c;
 451                 num_active_rx++;
 452         }
 453
 454         /* Average among active antennas */
 455         if (num_active_rx)
 456                 last_rx_noise = (total_silence / num_active_rx) - 107;
 457         else
 458                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 459
 460         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 461                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 462                         last_rx_noise);
 463 }
 464
 465 #ifdef CONFIG_IWLWIFI_DEBUGFS
 466 /*
 467  *  based on the assumption of all statistics counter are in DWORD
 468  *  FIXME: This function is for debugging, do not deal with
 469  *  the case of counters roll-over.
 470  */
 471 static void accum_stats(__le32 *prev, __le32 *cur, __le32 *delta,
 472                         __le32 *max_delta, __le32 *accum, int size)
 473 {
 474         int i;
 475
 476         for (i = 0;
 477              i < size / sizeof(__le32);
 478              i++, prev++, cur++, delta++, max_delta++, accum++) {
 479                 if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) {
 480                         *delta = cpu_to_le32(
 481                                 le32_to_cpu(*cur) - le32_to_cpu(*prev));
 482                         le32_add_cpu(accum, le32_to_cpu(*delta));
 483                         if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta))
 484                                 *max_delta = *delta;
 485                 }
 486         }
 487 }
 488
 489 static void
 490 iwl_accumulative_statistics(struct iwl_priv *priv,
 491                             struct statistics_general_common *common,
 492                             struct statistics_rx_non_phy *rx_non_phy,
 493                             struct statistics_rx_phy *rx_ofdm,
 494                             struct statistics_rx_ht_phy *rx_ofdm_ht,
 495                             struct statistics_rx_phy *rx_cck,
 496                             struct statistics_tx *tx,
 497                             struct statistics_bt_activity *bt_activity)
 498 {
 499 #define ACCUM(_name)    \
 500         accum_stats((__le32 *)&priv->statistics._name,          \
 501                     (__le32 *)_name,                            \
 502                     (__le32 *)&priv->delta_stats._name,         \
 503                     (__le32 *)&priv->max_delta_stats._name,     \
 504                     (__le32 *)&priv->accum_stats._name,         \
 505                     sizeof(*_name));
 506
 507         ACCUM(common);
 508         ACCUM(rx_non_phy);
 509         ACCUM(rx_ofdm);
 510         ACCUM(rx_ofdm_ht);
 511         ACCUM(rx_cck);
 512         ACCUM(tx);
 513         if (bt_activity)
 514                 ACCUM(bt_activity);
 515 #undef ACCUM
 516 }
 517 #else
 518 static inline void
 519 iwl_accumulative_statistics(struct iwl_priv *priv,
 520                             struct statistics_general_common *common,
 521                             struct statistics_rx_non_phy *rx_non_phy,
 522                             struct statistics_rx_phy *rx_ofdm,
 523                             struct statistics_rx_ht_phy *rx_ofdm_ht,
 524                             struct statistics_rx_phy *rx_cck,
 525                             struct statistics_tx *tx,
 526                             struct statistics_bt_activity *bt_activity)
 527 {
 528 }
 529 #endif
 530
 531 static void iwl_rx_statistics(struct iwl_priv *priv,
 532                               struct iwl_rx_mem_buffer *rxb)
 533 {
 534         unsigned long stamp = jiffies;
 535         const int reg_recalib_period = 60;
 536         int change;
 537         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 538         u32 len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
 539         __le32 *flag;
 540         struct statistics_general_common *common;
 541         struct statistics_rx_non_phy *rx_non_phy;
 542         struct statistics_rx_phy *rx_ofdm;
 543         struct statistics_rx_ht_phy *rx_ofdm_ht;
 544         struct statistics_rx_phy *rx_cck;
 545         struct statistics_tx *tx;
 546         struct statistics_bt_activity *bt_activity;
 547
 548         len -= sizeof(struct iwl_cmd_header); /* skip header */
 549
 550         IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n",
 551                      len);
 552
 553         if (len == sizeof(struct iwl_bt_notif_statistics)) {
 554                 struct iwl_bt_notif_statistics *stats;
 555                 stats = &pkt->u.stats_bt;
 556                 flag = &stats->flag;
 557                 common = &stats->general.common;
 558                 rx_non_phy = &stats->rx.general.common;
 559                 rx_ofdm = &stats->rx.ofdm;
 560                 rx_ofdm_ht = &stats->rx.ofdm_ht;
 561                 rx_cck = &stats->rx.cck;
 562                 tx = &stats->tx;
 563                 bt_activity = &stats->general.activity;
 564
 565 #ifdef CONFIG_IWLWIFI_DEBUGFS
 566                 /* handle this exception directly */
 567                 priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills;
 568                 le32_add_cpu(&priv->statistics.accum_num_bt_kills,
 569                              le32_to_cpu(stats->rx.general.num_bt_kills));
 570 #endif
 571         } else if (len == sizeof(struct iwl_notif_statistics)) {
 572                 struct iwl_notif_statistics *stats;
 573                 stats = &pkt->u.stats;
 574                 flag = &stats->flag;
 575                 common = &stats->general.common;
 576                 rx_non_phy = &stats->rx.general;
 577                 rx_ofdm = &stats->rx.ofdm;
 578                 rx_ofdm_ht = &stats->rx.ofdm_ht;
 579                 rx_cck = &stats->rx.cck;
 580                 tx = &stats->tx;
 581                 bt_activity = NULL;
 582         } else {
 583                 WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n",
 584                           len, sizeof(struct iwl_bt_notif_statistics),
 585                           sizeof(struct iwl_notif_statistics));
 586                 return;
 587         }
 588
 589         change = common->temperature != priv->statistics.common.temperature ||
 590                  (*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 591                  (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK);
 592
 593         iwl_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm,
 594                                     rx_ofdm_ht, rx_cck, tx, bt_activity);
 595
 596         iwl_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp);
 597
 598         priv->statistics.flag = *flag;
 599         memcpy(&priv->statistics.common, common, sizeof(*common));
 600         memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy));
 601         memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm));
 602         memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht));
 603         memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck));
 604         memcpy(&priv->statistics.tx, tx, sizeof(*tx));
 605 #ifdef CONFIG_IWLWIFI_DEBUGFS
 606         if (bt_activity)
 607                 memcpy(&priv->statistics.bt_activity, bt_activity,
 608                         sizeof(*bt_activity));
 609 #endif
 610
 611         priv->rx_statistics_jiffies = stamp;
 612
 613         set_bit(STATUS_STATISTICS, &priv->status);
 614
 615         /* Reschedule the statistics timer to occur in
 616          * reg_recalib_period seconds to ensure we get a
 617          * thermal update even if the uCode doesn't give
 618          * us one */
 619         mod_timer(&priv->statistics_periodic, jiffies +
 620                   msecs_to_jiffies(reg_recalib_period * 1000));
 621
 622         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 623             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 624                 iwl_rx_calc_noise(priv);
 625                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 626         }
 627         if (priv->cfg->ops->lib->temperature && change)
 628                 priv->cfg->ops->lib->temperature(priv);
 629 }
 630
 631 static void iwl_rx_reply_statistics(struct iwl_priv *priv,
 632                                     struct iwl_rx_mem_buffer *rxb)
 633 {
 634         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 635
 636         if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
 637 #ifdef CONFIG_IWLWIFI_DEBUGFS
 638                 memset(&priv->accum_stats, 0,
 639                         sizeof(priv->accum_stats));
 640                 memset(&priv->delta_stats, 0,
 641                         sizeof(priv->delta_stats));
 642                 memset(&priv->max_delta_stats, 0,
 643                         sizeof(priv->max_delta_stats));
 644 #endif
 645                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 646         }
 647         iwl_rx_statistics(priv, rxb);
 648 }
 649
 650 /* Handle notification from uCode that card's power state is changing
 651  * due to software, hardware, or critical temperature RFKILL */
 652 static void iwl_rx_card_state_notif(struct iwl_priv *priv,
 653                                     struct iwl_rx_mem_buffer *rxb)
 654 {
 655         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 656         u32 flags = le32_to_cpu(pkt->u.card_state_notif.flags);
 657         unsigned long status = priv->status;
 658
 659         IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
 660                           (flags & HW_CARD_DISABLED) ? "Kill" : "On",
 661                           (flags & SW_CARD_DISABLED) ? "Kill" : "On",
 662                           (flags & CT_CARD_DISABLED) ?
 663                           "Reached" : "Not reached");
 664
 665         if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
 666                      CT_CARD_DISABLED)) {
 667
 668                 iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
 669                             CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 670
 671                 iwl_write_direct32(priv, HBUS_TARG_MBX_C,
 672                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 673
 674                 if (!(flags & RXON_CARD_DISABLED)) {
 675                         iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
 676                                     CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 677                         iwl_write_direct32(priv, HBUS_TARG_MBX_C,
 678                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 679                 }
 680                 if (flags & CT_CARD_DISABLED)
 681                         iwl_tt_enter_ct_kill(priv);
 682         }
 683         if (!(flags & CT_CARD_DISABLED))
 684                 iwl_tt_exit_ct_kill(priv);
 685
 686         if (flags & HW_CARD_DISABLED)
 687                 set_bit(STATUS_RF_KILL_HW, &priv->status);
 688         else
 689                 clear_bit(STATUS_RF_KILL_HW, &priv->status);
 690
 691
 692         if (!(flags & RXON_CARD_DISABLED))
 693                 iwl_scan_cancel(priv);
 694
 695         if ((test_bit(STATUS_RF_KILL_HW, &status) !=
 696              test_bit(STATUS_RF_KILL_HW, &priv->status)))
 697                 wiphy_rfkill_set_hw_state(priv->hw->wiphy,
 698                         test_bit(STATUS_RF_KILL_HW, &priv->status));
 699         else
 700                 wake_up_interruptible(&priv->wait_command_queue);
 701 }
 702
 703 static void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
 704                                        struct iwl_rx_mem_buffer *rxb)
 705
 706 {
 707         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 708         struct iwl_missed_beacon_notif *missed_beacon;
 709
 710         missed_beacon = &pkt->u.missed_beacon;
 711         if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
 712             priv->missed_beacon_threshold) {
 713                 IWL_DEBUG_CALIB(priv,
 714                     "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 715                     le32_to_cpu(missed_beacon->consecutive_missed_beacons),
 716                     le32_to_cpu(missed_beacon->total_missed_becons),
 717                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 718                     le32_to_cpu(missed_beacon->num_expected_beacons));
 719                 if (!test_bit(STATUS_SCANNING, &priv->status))
 720                         iwl_init_sensitivity(priv);
 721         }
 722 }
 723
 724 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
 725  * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
 726 static void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
 727                                 struct iwl_rx_mem_buffer *rxb)
 728 {
 729         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 730
 731         priv->_agn.last_phy_res_valid = true;
 732         memcpy(&priv->_agn.last_phy_res, pkt->u.raw,
 733                sizeof(struct iwl_rx_phy_res));
 734 }
 735
 736 /*
 737  * returns non-zero if packet should be dropped
 738  */
 739 static int iwl_set_decrypted_flag(struct iwl_priv *priv,
 740                                   struct ieee80211_hdr *hdr,
 741                                   u32 decrypt_res,
 742                                   struct ieee80211_rx_status *stats)
 743 {
 744         u16 fc = le16_to_cpu(hdr->frame_control);
 745
 746         /*
 747          * All contexts have the same setting here due to it being
 748          * a module parameter, so OK to check any context.
 749          */
 750         if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags &
 751                                                 RXON_FILTER_DIS_DECRYPT_MSK)
 752                 return 0;
 753
 754         if (!(fc & IEEE80211_FCTL_PROTECTED))
 755                 return 0;
 756
 757         IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
 758         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 759         case RX_RES_STATUS_SEC_TYPE_TKIP:
 760                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 761                  * Decryption will be done in SW. */
 762                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 763                     RX_RES_STATUS_BAD_KEY_TTAK)
 764                         break;
 765
 766         case RX_RES_STATUS_SEC_TYPE_WEP:
 767                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 768                     RX_RES_STATUS_BAD_ICV_MIC) {
 769                         /* bad ICV, the packet is destroyed since the
 770                          * decryption is inplace, drop it */
 771                         IWL_DEBUG_RX(priv, "Packet destroyed\n");
 772                         return -1;
 773                 }
 774         case RX_RES_STATUS_SEC_TYPE_CCMP:
 775                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 776                     RX_RES_STATUS_DECRYPT_OK) {
 777                         IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
 778                         stats->flag |= RX_FLAG_DECRYPTED;
 779                 }
 780                 break;
 781
 782         default:
 783                 break;
 784         }
 785         return 0;
 786 }
 787
 788 static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 789                                         struct ieee80211_hdr *hdr,
 790                                         u16 len,
 791                                         u32 ampdu_status,
 792                                         struct iwl_rx_mem_buffer *rxb,
 793                                         struct ieee80211_rx_status *stats)
 794 {
 795         struct sk_buff *skb;
 796         __le16 fc = hdr->frame_control;
 797         struct iwl_rxon_context *ctx;
 798
 799         /* We only process data packets if the interface is open */
 800         if (unlikely(!priv->is_open)) {
 801                 IWL_DEBUG_DROP_LIMIT(priv,
 802                     "Dropping packet while interface is not open.\n");
 803                 return;
 804         }
 805
 806         /* In case of HW accelerated crypto and bad decryption, drop */
 807         if (!iwlagn_mod_params.sw_crypto &&
 808             iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
 809                 return;
 810
 811         skb = dev_alloc_skb(128);
 812         if (!skb) {
 813                 IWL_ERR(priv, "dev_alloc_skb failed\n");
 814                 return;
 815         }
 816
 817         skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
 818
 819         iwl_update_stats(priv, false, fc, len);
 820
 821         /*
 822         * Wake any queues that were stopped due to a passive channel tx
 823         * failure. This can happen because the regulatory enforcement in
 824         * the device waits for a beacon before allowing transmission,
 825         * sometimes even after already having transmitted frames for the
 826         * association because the new RXON may reset the information.
 827         */
 828         if (unlikely(ieee80211_is_beacon(fc))) {
 829                 for_each_context(priv, ctx) {
 830                         if (!ctx->last_tx_rejected)
 831                                 continue;
 832                         if (compare_ether_addr(hdr->addr3,
 833                                                ctx->active.bssid_addr))
 834                                 continue;
 835                         ctx->last_tx_rejected = false;
 836                         iwl_wake_any_queue(priv, ctx);
 837                 }
 838         }
 839
 840         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
 841
 842         ieee80211_rx(priv->hw, skb);
 843         rxb->page = NULL;
 844 }
 845
 846 static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
 847 {
 848         u32 decrypt_out = 0;
 849
 850         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
 851                                         RX_RES_STATUS_STATION_FOUND)
 852                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
 853                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
 854
 855         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
 856
 857         /* packet was not encrypted */
 858         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 859                                         RX_RES_STATUS_SEC_TYPE_NONE)
 860                 return decrypt_out;
 861
 862         /* packet was encrypted with unknown alg */
 863         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 864                                         RX_RES_STATUS_SEC_TYPE_ERR)
 865                 return decrypt_out;
 866
 867         /* decryption was not done in HW */
 868         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
 869                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
 870                 return decrypt_out;
 871
 872         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
 873
 874         case RX_RES_STATUS_SEC_TYPE_CCMP:
 875                 /* alg is CCM: check MIC only */
 876                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
 877                         /* Bad MIC */
 878                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 879                 else
 880                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 881
 882                 break;
 883
 884         case RX_RES_STATUS_SEC_TYPE_TKIP:
 885                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
 886                         /* Bad TTAK */
 887                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
 888                         break;
 889                 }
 890                 /* fall through if TTAK OK */
 891         default:
 892                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
 893                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 894                 else
 895                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 896                 break;
 897         }
 898
 899         IWL_DEBUG_RX(priv, "decrypt_in:0x%x  decrypt_out = 0x%x\n",
 900                                         decrypt_in, decrypt_out);
 901
 902         return decrypt_out;
 903 }
 904
 905 /* Calc max signal level (dBm) among 3 possible receivers */
 906 static int iwlagn_calc_rssi(struct iwl_priv *priv,
 907                              struct iwl_rx_phy_res *rx_resp)
 908 {
 909         /* data from PHY/DSP regarding signal strength, etc.,
 910          *   contents are always there, not configurable by host
 911          */
 912         struct iwlagn_non_cfg_phy *ncphy =
 913                 (struct iwlagn_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
 914         u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
 915         u8 agc;
 916
 917         val  = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_AGC_IDX]);
 918         agc = (val & IWLAGN_OFDM_AGC_MSK) >> IWLAGN_OFDM_AGC_BIT_POS;
 919
 920         /* Find max rssi among 3 possible receivers.
 921          * These values are measured by the digital signal processor (DSP).
 922          * They should stay fairly constant even as the signal strength varies,
 923          *   if the radio's automatic gain control (AGC) is working right.
 924          * AGC value (see below) will provide the "interesting" info.
 925          */
 926         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_AB_IDX]);
 927         rssi_a = (val & IWLAGN_OFDM_RSSI_INBAND_A_BITMSK) >>
 928                 IWLAGN_OFDM_RSSI_A_BIT_POS;
 929         rssi_b = (val & IWLAGN_OFDM_RSSI_INBAND_B_BITMSK) >>
 930                 IWLAGN_OFDM_RSSI_B_BIT_POS;
 931         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_C_IDX]);
 932         rssi_c = (val & IWLAGN_OFDM_RSSI_INBAND_C_BITMSK) >>
 933                 IWLAGN_OFDM_RSSI_C_BIT_POS;
 934
 935         max_rssi = max_t(u32, rssi_a, rssi_b);
 936         max_rssi = max_t(u32, max_rssi, rssi_c);
 937
 938         IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
 939                 rssi_a, rssi_b, rssi_c, max_rssi, agc);
 940
 941         /* dBm = max_rssi dB - agc dB - constant.
 942          * Higher AGC (higher radio gain) means lower signal. */
 943         return max_rssi - agc - IWLAGN_RSSI_OFFSET;
 944 }
 945
 946 /* Called for REPLY_RX (legacy ABG frames), or
 947  * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
 948 static void iwl_rx_reply_rx(struct iwl_priv *priv,
 949                             struct iwl_rx_mem_buffer *rxb)
 950 {
 951         struct ieee80211_hdr *header;
 952         struct ieee80211_rx_status rx_status;
 953         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 954         struct iwl_rx_phy_res *phy_res;
 955         __le32 rx_pkt_status;
 956         struct iwl_rx_mpdu_res_start *amsdu;
 957         u32 len;
 958         u32 ampdu_status;
 959         u32 rate_n_flags;
 960
 961         /**
 962          * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
 963          *      REPLY_RX: physical layer info is in this buffer
 964          *      REPLY_RX_MPDU_CMD: physical layer info was sent in separate
 965          *              command and cached in priv->last_phy_res
 966          *
 967          * Here we set up local variables depending on which command is
 968          * received.
 969          */
 970         if (pkt->hdr.cmd == REPLY_RX) {
 971                 phy_res = (struct iwl_rx_phy_res *)pkt->u.raw;
 972                 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res)
 973                                 + phy_res->cfg_phy_cnt);
 974
 975                 len = le16_to_cpu(phy_res->byte_count);
 976                 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) +
 977                                 phy_res->cfg_phy_cnt + len);
 978                 ampdu_status = le32_to_cpu(rx_pkt_status);
 979         } else {
 980                 if (!priv->_agn.last_phy_res_valid) {
 981                         IWL_ERR(priv, "MPDU frame without cached PHY data\n");
 982                         return;
 983                 }
 984                 phy_res = &priv->_agn.last_phy_res;
 985                 amsdu = (struct iwl_rx_mpdu_res_start *)pkt->u.raw;
 986                 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu));
 987                 len = le16_to_cpu(amsdu->byte_count);
 988                 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len);
 989                 ampdu_status = iwl_translate_rx_status(priv,
 990                                                 le32_to_cpu(rx_pkt_status));
 991         }
 992
 993         if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
 994                 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n",
 995                                 phy_res->cfg_phy_cnt);
 996                 return;
 997         }
 998
 999         if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
1000             !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
1001                 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
1002                                 le32_to_cpu(rx_pkt_status));
1003                 return;
1004         }
1005
1006         /* This will be used in several places later */
1007         rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
1008
1009         /* rx_status carries information about the packet to mac80211 */
1010         rx_status.mactime = le64_to_cpu(phy_res->timestamp);
1011         rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
1012                                 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
1013         rx_status.freq =
1014                 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel),
1015                                                rx_status.band);
1016         rx_status.rate_idx =
1017                 iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
1018         rx_status.flag = 0;
1019
1020         /* TSF isn't reliable. In order to allow smooth user experience,
1021          * this W/A doesn't propagate it to the mac80211 */
1022         /*rx_status.flag |= RX_FLAG_MACTIME_MPDU;*/
1023
1024         priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
1025
1026         /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1027         rx_status.signal = iwlagn_calc_rssi(priv, phy_res);
1028
1029         iwl_dbg_log_rx_data_frame(priv, len, header);
1030         IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n",
1031                 rx_status.signal, (unsigned long long)rx_status.mactime);
1032
1033         /*
1034          * "antenna number"
1035          *
1036          * It seems that the antenna field in the phy flags value
1037          * is actually a bit field. This is undefined by radiotap,
1038          * it wants an actual antenna number but I always get "7"
1039          * for most legacy frames I receive indicating that the
1040          * same frame was received on all three RX chains.
1041          *
1042          * I think this field should be removed in favor of a
1043          * new 802.11n radiotap field "RX chains" that is defined
1044          * as a bitmask.
1045          */
1046         rx_status.antenna =
1047                 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
1048                 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
1049
1050         /* set the preamble flag if appropriate */
1051         if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
1052                 rx_status.flag |= RX_FLAG_SHORTPRE;
1053
1054         /* Set up the HT phy flags */
1055         if (rate_n_flags & RATE_MCS_HT_MSK)
1056                 rx_status.flag |= RX_FLAG_HT;
1057         if (rate_n_flags & RATE_MCS_HT40_MSK)
1058                 rx_status.flag |= RX_FLAG_40MHZ;
1059         if (rate_n_flags & RATE_MCS_SGI_MSK)
1060                 rx_status.flag |= RX_FLAG_SHORT_GI;
1061
1062         iwl_pass_packet_to_mac80211(priv, header, len, ampdu_status,
1063                                     rxb, &rx_status);
1064 }
1065
1066 /**
1067  * iwl_setup_rx_handlers - Initialize Rx handler callbacks
1068  *
1069  * Setup the RX handlers for each of the reply types sent from the uCode
1070  * to the host.
1071  */
1072 void iwl_setup_rx_handlers(struct iwl_priv *priv)
1073 {
1074         void (**handlers)(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb);
1075
1076         handlers = priv->rx_handlers;
1077
1078         handlers[REPLY_ERROR]                   = iwl_rx_reply_error;
1079         handlers[CHANNEL_SWITCH_NOTIFICATION]   = iwl_rx_csa;
1080         handlers[SPECTRUM_MEASURE_NOTIFICATION] = iwl_rx_spectrum_measure_notif;
1081         handlers[PM_SLEEP_NOTIFICATION]         = iwl_rx_pm_sleep_notif;
1082         handlers[PM_DEBUG_STATISTIC_NOTIFIC]    = iwl_rx_pm_debug_statistics_notif;
1083         handlers[BEACON_NOTIFICATION]           = iwl_rx_beacon_notif;
1084
1085         /*
1086          * The same handler is used for both the REPLY to a discrete
1087          * statistics request from the host as well as for the periodic
1088          * statistics notifications (after received beacons) from the uCode.
1089          */
1090         handlers[REPLY_STATISTICS_CMD]          = iwl_rx_reply_statistics;
1091         handlers[STATISTICS_NOTIFICATION]       = iwl_rx_statistics;
1092
1093         iwl_setup_rx_scan_handlers(priv);
1094
1095         handlers[CARD_STATE_NOTIFICATION]       = iwl_rx_card_state_notif;
1096         handlers[MISSED_BEACONS_NOTIFICATION]   = iwl_rx_missed_beacon_notif;
1097
1098         /* Rx handlers */
1099         handlers[REPLY_RX_PHY_CMD]              = iwl_rx_reply_rx_phy;
1100         handlers[REPLY_RX_MPDU_CMD]             = iwl_rx_reply_rx;
1101
1102         /* block ack */
1103         handlers[REPLY_COMPRESSED_BA]           = iwlagn_rx_reply_compressed_ba;
1104
1105         /* Set up hardware specific Rx handlers */
1106         priv->cfg->ops->lib->rx_handler_setup(priv);
1107 }