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 rx_wrt_ptr_reg = priv->hw_params.rx_wrt_ptr_reg;
 138         u32 reg;
 139
 140         spin_lock_irqsave(&q->lock, flags);
 141
 142         if (q->need_update == 0)
 143                 goto exit_unlock;
 144
 145         if (priv->cfg->base_params->shadow_reg_enable) {
 146                 /* shadow register enabled */
 147                 /* Device expects a multiple of 8 */
 148                 q->write_actual = (q->write & ~0x7);
 149                 iwl_write32(priv, rx_wrt_ptr_reg, q->write_actual);
 150         } else {
 151                 /* If power-saving is in use, make sure device is awake */
 152                 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
 153                         reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
 154
 155                         if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
 156                                 IWL_DEBUG_INFO(priv,
 157                                         "Rx queue requesting wakeup,"
 158                                         " GP1 = 0x%x\n", reg);
 159                                 iwl_set_bit(priv, CSR_GP_CNTRL,
 160                                         CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 161                                 goto exit_unlock;
 162                         }
 163
 164                         q->write_actual = (q->write & ~0x7);
 165                         iwl_write_direct32(priv, rx_wrt_ptr_reg,
 166                                         q->write_actual);
 167
 168                 /* Else device is assumed to be awake */
 169                 } else {
 170                         /* Device expects a multiple of 8 */
 171                         q->write_actual = (q->write & ~0x7);
 172                         iwl_write_direct32(priv, rx_wrt_ptr_reg,
 173                                 q->write_actual);
 174                 }
 175         }
 176         q->need_update = 0;
 177
 178  exit_unlock:
 179         spin_unlock_irqrestore(&q->lock, flags);
 180 }
 181
 182 int iwl_rx_queue_alloc(struct iwl_priv *priv)
 183 {
 184         struct iwl_rx_queue *rxq = &priv->rxq;
 185         struct device *dev = &priv->pci_dev->dev;
 186         int i;
 187
 188         spin_lock_init(&rxq->lock);
 189         INIT_LIST_HEAD(&rxq->rx_free);
 190         INIT_LIST_HEAD(&rxq->rx_used);
 191
 192         /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
 193         rxq->bd = dma_alloc_coherent(dev, 4 * RX_QUEUE_SIZE, &rxq->bd_dma,
 194                                      GFP_KERNEL);
 195         if (!rxq->bd)
 196                 goto err_bd;
 197
 198         rxq->rb_stts = dma_alloc_coherent(dev, sizeof(struct iwl_rb_status),
 199                                           &rxq->rb_stts_dma, GFP_KERNEL);
 200         if (!rxq->rb_stts)
 201                 goto err_rb;
 202
 203         /* Fill the rx_used queue with _all_ of the Rx buffers */
 204         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
 205                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 206
 207         /* Set us so that we have processed and used all buffers, but have
 208          * not restocked the Rx queue with fresh buffers */
 209         rxq->read = rxq->write = 0;
 210         rxq->write_actual = 0;
 211         rxq->free_count = 0;
 212         rxq->need_update = 0;
 213         return 0;
 214
 215 err_rb:
 216         dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
 217                           rxq->bd_dma);
 218 err_bd:
 219         return -ENOMEM;
 220 }
 221
 222 /******************************************************************************
 223  *
 224  * Generic RX handler implementations
 225  *
 226  ******************************************************************************/
 227
 228 static void iwl_rx_reply_error(struct iwl_priv *priv,
 229                                struct iwl_rx_mem_buffer *rxb)
 230 {
 231         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 232
 233         IWL_ERR(priv, "Error Reply type 0x%08X cmd %s (0x%02X) "
 234                 "seq 0x%04X ser 0x%08X\n",
 235                 le32_to_cpu(pkt->u.err_resp.error_type),
 236                 get_cmd_string(pkt->u.err_resp.cmd_id),
 237                 pkt->u.err_resp.cmd_id,
 238                 le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num),
 239                 le32_to_cpu(pkt->u.err_resp.error_info));
 240 }
 241
 242 static void iwl_rx_csa(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
 243 {
 244         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 245         struct iwl_csa_notification *csa = &(pkt->u.csa_notif);
 246         /*
 247          * MULTI-FIXME
 248          * See iwl_mac_channel_switch.
 249          */
 250         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 251         struct iwl_rxon_cmd *rxon = (void *)&ctx->active;
 252
 253         if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status))
 254                 return;
 255
 256         if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) {
 257                 rxon->channel = csa->channel;
 258                 ctx->staging.channel = csa->channel;
 259                 IWL_DEBUG_11H(priv, "CSA notif: channel %d\n",
 260                               le16_to_cpu(csa->channel));
 261                 iwl_chswitch_done(priv, true);
 262         } else {
 263                 IWL_ERR(priv, "CSA notif (fail) : channel %d\n",
 264                         le16_to_cpu(csa->channel));
 265                 iwl_chswitch_done(priv, false);
 266         }
 267 }
 268
 269
 270 static void iwl_rx_spectrum_measure_notif(struct iwl_priv *priv,
 271                                           struct iwl_rx_mem_buffer *rxb)
 272 {
 273         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 274         struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif);
 275
 276         if (!report->state) {
 277                 IWL_DEBUG_11H(priv,
 278                         "Spectrum Measure Notification: Start\n");
 279                 return;
 280         }
 281
 282         memcpy(&priv->measure_report, report, sizeof(*report));
 283         priv->measurement_status |= MEASUREMENT_READY;
 284 }
 285
 286 static void iwl_rx_pm_sleep_notif(struct iwl_priv *priv,
 287                                   struct iwl_rx_mem_buffer *rxb)
 288 {
 289 #ifdef CONFIG_IWLWIFI_DEBUG
 290         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 291         struct iwl_sleep_notification *sleep = &(pkt->u.sleep_notif);
 292         IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n",
 293                      sleep->pm_sleep_mode, sleep->pm_wakeup_src);
 294 #endif
 295 }
 296
 297 static void iwl_rx_pm_debug_statistics_notif(struct iwl_priv *priv,
 298                                              struct iwl_rx_mem_buffer *rxb)
 299 {
 300         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 301         u32 len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
 302         IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled "
 303                         "notification for %s:\n", len,
 304                         get_cmd_string(pkt->hdr.cmd));
 305         iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->u.raw, len);
 306 }
 307
 308 static void iwl_rx_beacon_notif(struct iwl_priv *priv,
 309                                 struct iwl_rx_mem_buffer *rxb)
 310 {
 311         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 312         struct iwlagn_beacon_notif *beacon = (void *)pkt->u.raw;
 313 #ifdef CONFIG_IWLWIFI_DEBUG
 314         u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status);
 315         u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);
 316
 317         IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d "
 318                 "tsf:0x%.8x%.8x rate:%d\n",
 319                 status & TX_STATUS_MSK,
 320                 beacon->beacon_notify_hdr.failure_frame,
 321                 le32_to_cpu(beacon->ibss_mgr_status),
 322                 le32_to_cpu(beacon->high_tsf),
 323                 le32_to_cpu(beacon->low_tsf), rate);
 324 #endif
 325
 326         priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);
 327
 328         if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
 329                 queue_work(priv->workqueue, &priv->beacon_update);
 330 }
 331
 332 /* the threshold ratio of actual_ack_cnt to expected_ack_cnt in percent */
 333 #define ACK_CNT_RATIO (50)
 334 #define BA_TIMEOUT_CNT (5)
 335 #define BA_TIMEOUT_MAX (16)
 336
 337 /**
 338  * iwl_good_ack_health - checks for ACK count ratios, BA timeout retries.
 339  *
 340  * When the ACK count ratio is low and aggregated BA timeout retries exceeding
 341  * the BA_TIMEOUT_MAX, reload firmware and bring system back to normal
 342  * operation state.
 343  */
 344 static bool iwl_good_ack_health(struct iwl_priv *priv,
 345                                 struct statistics_tx *cur)
 346 {
 347         int actual_delta, expected_delta, ba_timeout_delta;
 348         struct statistics_tx *old;
 349
 350         if (priv->_agn.agg_tids_count)
 351                 return true;
 352
 353         old = &priv->statistics.tx;
 354
 355         actual_delta = le32_to_cpu(cur->actual_ack_cnt) -
 356                        le32_to_cpu(old->actual_ack_cnt);
 357         expected_delta = le32_to_cpu(cur->expected_ack_cnt) -
 358                          le32_to_cpu(old->expected_ack_cnt);
 359
 360         /* Values should not be negative, but we do not trust the firmware */
 361         if (actual_delta <= 0 || expected_delta <= 0)
 362                 return true;
 363
 364         ba_timeout_delta = le32_to_cpu(cur->agg.ba_timeout) -
 365                            le32_to_cpu(old->agg.ba_timeout);
 366
 367         if ((actual_delta * 100 / expected_delta) < ACK_CNT_RATIO &&
 368             ba_timeout_delta > BA_TIMEOUT_CNT) {
 369                 IWL_DEBUG_RADIO(priv, "deltas: actual %d expected %d ba_timeout %d\n",
 370                                 actual_delta, expected_delta, ba_timeout_delta);
 371
 372 #ifdef CONFIG_IWLWIFI_DEBUGFS
 373                 /*
 374                  * This is ifdef'ed on DEBUGFS because otherwise the
 375                  * statistics aren't available. If DEBUGFS is set but
 376                  * DEBUG is not, these will just compile out.
 377                  */
 378                 IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta %d\n",
 379                                 priv->delta_stats.tx.rx_detected_cnt);
 380                 IWL_DEBUG_RADIO(priv,
 381                                 "ack_or_ba_timeout_collision delta %d\n",
 382                                 priv->delta_stats.tx.ack_or_ba_timeout_collision);
 383 #endif
 384
 385                 if (ba_timeout_delta >= BA_TIMEOUT_MAX)
 386                         return false;
 387         }
 388
 389         return true;
 390 }
 391
 392 /**
 393  * iwl_good_plcp_health - checks for plcp error.
 394  *
 395  * When the plcp error is exceeding the thresholds, reset the radio
 396  * to improve the throughput.
 397  */
 398 static bool iwl_good_plcp_health(struct iwl_priv *priv,
 399                                  struct statistics_rx_phy *cur_ofdm,
 400                                  struct statistics_rx_ht_phy *cur_ofdm_ht,
 401                                  unsigned int msecs)
 402 {
 403         int delta;
 404         int threshold = priv->cfg->base_params->plcp_delta_threshold;
 405
 406         if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
 407                 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
 408                 return true;
 409         }
 410
 411         delta = le32_to_cpu(cur_ofdm->plcp_err) -
 412                 le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) +
 413                 le32_to_cpu(cur_ofdm_ht->plcp_err) -
 414                 le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err);
 415
 416         /* Can be negative if firmware reset statistics */
 417         if (delta <= 0)
 418                 return true;
 419
 420         if ((delta * 100 / msecs) > threshold) {
 421                 IWL_DEBUG_RADIO(priv,
 422                                 "plcp health threshold %u delta %d msecs %u\n",
 423                                 threshold, delta, msecs);
 424                 return false;
 425         }
 426
 427         return true;
 428 }
 429
 430 static void iwl_recover_from_statistics(struct iwl_priv *priv,
 431                                         struct statistics_rx_phy *cur_ofdm,
 432                                         struct statistics_rx_ht_phy *cur_ofdm_ht,
 433                                         struct statistics_tx *tx,
 434                                         unsigned long stamp)
 435 {
 436         unsigned int msecs;
 437
 438         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 439                 return;
 440
 441         msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies);
 442
 443         /* Only gather statistics and update time stamp when not associated */
 444         if (!iwl_is_any_associated(priv))
 445                 return;
 446
 447         /* Do not check/recover when do not have enough statistics data */
 448         if (msecs < 99)
 449                 return;
 450
 451         if (iwlagn_mod_params.ack_check && !iwl_good_ack_health(priv, tx)) {
 452                 IWL_ERR(priv, "low ack count detected, restart firmware\n");
 453                 if (!iwl_force_reset(priv, IWL_FW_RESET, false))
 454                         return;
 455         }
 456
 457         if (iwlagn_mod_params.plcp_check &&
 458             !iwl_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs))
 459                 iwl_force_reset(priv, IWL_RF_RESET, false);
 460 }
 461
 462 /* Calculate noise level, based on measurements during network silence just
 463  *   before arriving beacon.  This measurement can be done only if we know
 464  *   exactly when to expect beacons, therefore only when we're associated. */
 465 static void iwl_rx_calc_noise(struct iwl_priv *priv)
 466 {
 467         struct statistics_rx_non_phy *rx_info;
 468         int num_active_rx = 0;
 469         int total_silence = 0;
 470         int bcn_silence_a, bcn_silence_b, bcn_silence_c;
 471         int last_rx_noise;
 472
 473         rx_info = &priv->statistics.rx_non_phy;
 474
 475         bcn_silence_a =
 476                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 477         bcn_silence_b =
 478                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 479         bcn_silence_c =
 480                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 481
 482         if (bcn_silence_a) {
 483                 total_silence += bcn_silence_a;
 484                 num_active_rx++;
 485         }
 486         if (bcn_silence_b) {
 487                 total_silence += bcn_silence_b;
 488                 num_active_rx++;
 489         }
 490         if (bcn_silence_c) {
 491                 total_silence += bcn_silence_c;
 492                 num_active_rx++;
 493         }
 494
 495         /* Average among active antennas */
 496         if (num_active_rx)
 497                 last_rx_noise = (total_silence / num_active_rx) - 107;
 498         else
 499                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 500
 501         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 502                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 503                         last_rx_noise);
 504 }
 505
 506 #ifdef CONFIG_IWLWIFI_DEBUGFS
 507 /*
 508  *  based on the assumption of all statistics counter are in DWORD
 509  *  FIXME: This function is for debugging, do not deal with
 510  *  the case of counters roll-over.
 511  */
 512 static void accum_stats(__le32 *prev, __le32 *cur, __le32 *delta,
 513                         __le32 *max_delta, __le32 *accum, int size)
 514 {
 515         int i;
 516
 517         for (i = 0;
 518              i < size / sizeof(__le32);
 519              i++, prev++, cur++, delta++, max_delta++, accum++) {
 520                 if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) {
 521                         *delta = cpu_to_le32(
 522                                 le32_to_cpu(*cur) - le32_to_cpu(*prev));
 523                         le32_add_cpu(accum, le32_to_cpu(*delta));
 524                         if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta))
 525                                 *max_delta = *delta;
 526                 }
 527         }
 528 }
 529
 530 static void
 531 iwl_accumulative_statistics(struct iwl_priv *priv,
 532                             struct statistics_general_common *common,
 533                             struct statistics_rx_non_phy *rx_non_phy,
 534                             struct statistics_rx_phy *rx_ofdm,
 535                             struct statistics_rx_ht_phy *rx_ofdm_ht,
 536                             struct statistics_rx_phy *rx_cck,
 537                             struct statistics_tx *tx,
 538                             struct statistics_bt_activity *bt_activity)
 539 {
 540 #define ACCUM(_name)    \
 541         accum_stats((__le32 *)&priv->statistics._name,          \
 542                     (__le32 *)_name,                            \
 543                     (__le32 *)&priv->delta_stats._name,         \
 544                     (__le32 *)&priv->max_delta_stats._name,     \
 545                     (__le32 *)&priv->accum_stats._name,         \
 546                     sizeof(*_name));
 547
 548         ACCUM(common);
 549         ACCUM(rx_non_phy);
 550         ACCUM(rx_ofdm);
 551         ACCUM(rx_ofdm_ht);
 552         ACCUM(rx_cck);
 553         ACCUM(tx);
 554         if (bt_activity)
 555                 ACCUM(bt_activity);
 556 #undef ACCUM
 557 }
 558 #else
 559 static inline void
 560 iwl_accumulative_statistics(struct iwl_priv *priv,
 561                             struct statistics_general_common *common,
 562                             struct statistics_rx_non_phy *rx_non_phy,
 563                             struct statistics_rx_phy *rx_ofdm,
 564                             struct statistics_rx_ht_phy *rx_ofdm_ht,
 565                             struct statistics_rx_phy *rx_cck,
 566                             struct statistics_tx *tx,
 567                             struct statistics_bt_activity *bt_activity)
 568 {
 569 }
 570 #endif
 571
 572 static void iwl_rx_statistics(struct iwl_priv *priv,
 573                               struct iwl_rx_mem_buffer *rxb)
 574 {
 575         unsigned long stamp = jiffies;
 576         const int reg_recalib_period = 60;
 577         int change;
 578         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 579         u32 len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
 580         __le32 *flag;
 581         struct statistics_general_common *common;
 582         struct statistics_rx_non_phy *rx_non_phy;
 583         struct statistics_rx_phy *rx_ofdm;
 584         struct statistics_rx_ht_phy *rx_ofdm_ht;
 585         struct statistics_rx_phy *rx_cck;
 586         struct statistics_tx *tx;
 587         struct statistics_bt_activity *bt_activity;
 588
 589         len -= sizeof(struct iwl_cmd_header); /* skip header */
 590
 591         IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n",
 592                      len);
 593
 594         if (len == sizeof(struct iwl_bt_notif_statistics)) {
 595                 struct iwl_bt_notif_statistics *stats;
 596                 stats = &pkt->u.stats_bt;
 597                 flag = &stats->flag;
 598                 common = &stats->general.common;
 599                 rx_non_phy = &stats->rx.general.common;
 600                 rx_ofdm = &stats->rx.ofdm;
 601                 rx_ofdm_ht = &stats->rx.ofdm_ht;
 602                 rx_cck = &stats->rx.cck;
 603                 tx = &stats->tx;
 604                 bt_activity = &stats->general.activity;
 605
 606 #ifdef CONFIG_IWLWIFI_DEBUGFS
 607                 /* handle this exception directly */
 608                 priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills;
 609                 le32_add_cpu(&priv->statistics.accum_num_bt_kills,
 610                              le32_to_cpu(stats->rx.general.num_bt_kills));
 611 #endif
 612         } else if (len == sizeof(struct iwl_notif_statistics)) {
 613                 struct iwl_notif_statistics *stats;
 614                 stats = &pkt->u.stats;
 615                 flag = &stats->flag;
 616                 common = &stats->general.common;
 617                 rx_non_phy = &stats->rx.general;
 618                 rx_ofdm = &stats->rx.ofdm;
 619                 rx_ofdm_ht = &stats->rx.ofdm_ht;
 620                 rx_cck = &stats->rx.cck;
 621                 tx = &stats->tx;
 622                 bt_activity = NULL;
 623         } else {
 624                 WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n",
 625                           len, sizeof(struct iwl_bt_notif_statistics),
 626                           sizeof(struct iwl_notif_statistics));
 627                 return;
 628         }
 629
 630         change = common->temperature != priv->statistics.common.temperature ||
 631                  (*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 632                  (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK);
 633
 634         iwl_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm,
 635                                     rx_ofdm_ht, rx_cck, tx, bt_activity);
 636
 637         iwl_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp);
 638
 639         priv->statistics.flag = *flag;
 640         memcpy(&priv->statistics.common, common, sizeof(*common));
 641         memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy));
 642         memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm));
 643         memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht));
 644         memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck));
 645         memcpy(&priv->statistics.tx, tx, sizeof(*tx));
 646 #ifdef CONFIG_IWLWIFI_DEBUGFS
 647         if (bt_activity)
 648                 memcpy(&priv->statistics.bt_activity, bt_activity,
 649                         sizeof(*bt_activity));
 650 #endif
 651
 652         priv->rx_statistics_jiffies = stamp;
 653
 654         set_bit(STATUS_STATISTICS, &priv->status);
 655
 656         /* Reschedule the statistics timer to occur in
 657          * reg_recalib_period seconds to ensure we get a
 658          * thermal update even if the uCode doesn't give
 659          * us one */
 660         mod_timer(&priv->statistics_periodic, jiffies +
 661                   msecs_to_jiffies(reg_recalib_period * 1000));
 662
 663         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 664             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 665                 iwl_rx_calc_noise(priv);
 666                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 667         }
 668         if (priv->cfg->ops->lib->temp_ops.temperature && change)
 669                 priv->cfg->ops->lib->temp_ops.temperature(priv);
 670 }
 671
 672 static void iwl_rx_reply_statistics(struct iwl_priv *priv,
 673                                     struct iwl_rx_mem_buffer *rxb)
 674 {
 675         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 676
 677         if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
 678 #ifdef CONFIG_IWLWIFI_DEBUGFS
 679                 memset(&priv->accum_stats, 0,
 680                         sizeof(priv->accum_stats));
 681                 memset(&priv->delta_stats, 0,
 682                         sizeof(priv->delta_stats));
 683                 memset(&priv->max_delta_stats, 0,
 684                         sizeof(priv->max_delta_stats));
 685 #endif
 686                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 687         }
 688         iwl_rx_statistics(priv, rxb);
 689 }
 690
 691 /* Handle notification from uCode that card's power state is changing
 692  * due to software, hardware, or critical temperature RFKILL */
 693 static void iwl_rx_card_state_notif(struct iwl_priv *priv,
 694                                     struct iwl_rx_mem_buffer *rxb)
 695 {
 696         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 697         u32 flags = le32_to_cpu(pkt->u.card_state_notif.flags);
 698         unsigned long status = priv->status;
 699
 700         IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
 701                           (flags & HW_CARD_DISABLED) ? "Kill" : "On",
 702                           (flags & SW_CARD_DISABLED) ? "Kill" : "On",
 703                           (flags & CT_CARD_DISABLED) ?
 704                           "Reached" : "Not reached");
 705
 706         if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
 707                      CT_CARD_DISABLED)) {
 708
 709                 iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
 710                             CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 711
 712                 iwl_write_direct32(priv, HBUS_TARG_MBX_C,
 713                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 714
 715                 if (!(flags & RXON_CARD_DISABLED)) {
 716                         iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
 717                                     CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 718                         iwl_write_direct32(priv, HBUS_TARG_MBX_C,
 719                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 720                 }
 721                 if (flags & CT_CARD_DISABLED)
 722                         iwl_tt_enter_ct_kill(priv);
 723         }
 724         if (!(flags & CT_CARD_DISABLED))
 725                 iwl_tt_exit_ct_kill(priv);
 726
 727         if (flags & HW_CARD_DISABLED)
 728                 set_bit(STATUS_RF_KILL_HW, &priv->status);
 729         else
 730                 clear_bit(STATUS_RF_KILL_HW, &priv->status);
 731
 732
 733         if (!(flags & RXON_CARD_DISABLED))
 734                 iwl_scan_cancel(priv);
 735
 736         if ((test_bit(STATUS_RF_KILL_HW, &status) !=
 737              test_bit(STATUS_RF_KILL_HW, &priv->status)))
 738                 wiphy_rfkill_set_hw_state(priv->hw->wiphy,
 739                         test_bit(STATUS_RF_KILL_HW, &priv->status));
 740         else
 741                 wake_up_interruptible(&priv->wait_command_queue);
 742 }
 743
 744 static void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
 745                                        struct iwl_rx_mem_buffer *rxb)
 746
 747 {
 748         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 749         struct iwl_missed_beacon_notif *missed_beacon;
 750
 751         missed_beacon = &pkt->u.missed_beacon;
 752         if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
 753             priv->missed_beacon_threshold) {
 754                 IWL_DEBUG_CALIB(priv,
 755                     "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 756                     le32_to_cpu(missed_beacon->consecutive_missed_beacons),
 757                     le32_to_cpu(missed_beacon->total_missed_becons),
 758                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 759                     le32_to_cpu(missed_beacon->num_expected_beacons));
 760                 if (!test_bit(STATUS_SCANNING, &priv->status))
 761                         iwl_init_sensitivity(priv);
 762         }
 763 }
 764
 765 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
 766  * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
 767 static void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
 768                                 struct iwl_rx_mem_buffer *rxb)
 769 {
 770         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 771
 772         priv->_agn.last_phy_res_valid = true;
 773         memcpy(&priv->_agn.last_phy_res, pkt->u.raw,
 774                sizeof(struct iwl_rx_phy_res));
 775 }
 776
 777 /*
 778  * returns non-zero if packet should be dropped
 779  */
 780 static int iwl_set_decrypted_flag(struct iwl_priv *priv,
 781                                   struct ieee80211_hdr *hdr,
 782                                   u32 decrypt_res,
 783                                   struct ieee80211_rx_status *stats)
 784 {
 785         u16 fc = le16_to_cpu(hdr->frame_control);
 786
 787         /*
 788          * All contexts have the same setting here due to it being
 789          * a module parameter, so OK to check any context.
 790          */
 791         if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags &
 792                                                 RXON_FILTER_DIS_DECRYPT_MSK)
 793                 return 0;
 794
 795         if (!(fc & IEEE80211_FCTL_PROTECTED))
 796                 return 0;
 797
 798         IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
 799         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 800         case RX_RES_STATUS_SEC_TYPE_TKIP:
 801                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 802                  * Decryption will be done in SW. */
 803                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 804                     RX_RES_STATUS_BAD_KEY_TTAK)
 805                         break;
 806
 807         case RX_RES_STATUS_SEC_TYPE_WEP:
 808                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 809                     RX_RES_STATUS_BAD_ICV_MIC) {
 810                         /* bad ICV, the packet is destroyed since the
 811                          * decryption is inplace, drop it */
 812                         IWL_DEBUG_RX(priv, "Packet destroyed\n");
 813                         return -1;
 814                 }
 815         case RX_RES_STATUS_SEC_TYPE_CCMP:
 816                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 817                     RX_RES_STATUS_DECRYPT_OK) {
 818                         IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
 819                         stats->flag |= RX_FLAG_DECRYPTED;
 820                 }
 821                 break;
 822
 823         default:
 824                 break;
 825         }
 826         return 0;
 827 }
 828
 829 static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 830                                         struct ieee80211_hdr *hdr,
 831                                         u16 len,
 832                                         u32 ampdu_status,
 833                                         struct iwl_rx_mem_buffer *rxb,
 834                                         struct ieee80211_rx_status *stats)
 835 {
 836         struct sk_buff *skb;
 837         __le16 fc = hdr->frame_control;
 838         struct iwl_rxon_context *ctx;
 839
 840         /* We only process data packets if the interface is open */
 841         if (unlikely(!priv->is_open)) {
 842                 IWL_DEBUG_DROP_LIMIT(priv,
 843                     "Dropping packet while interface is not open.\n");
 844                 return;
 845         }
 846
 847         /* In case of HW accelerated crypto and bad decryption, drop */
 848         if (!iwlagn_mod_params.sw_crypto &&
 849             iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
 850                 return;
 851
 852         skb = dev_alloc_skb(128);
 853         if (!skb) {
 854                 IWL_ERR(priv, "dev_alloc_skb failed\n");
 855                 return;
 856         }
 857
 858         skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
 859
 860         iwl_update_stats(priv, false, fc, len);
 861
 862         /*
 863         * Wake any queues that were stopped due to a passive channel tx
 864         * failure. This can happen because the regulatory enforcement in
 865         * the device waits for a beacon before allowing transmission,
 866         * sometimes even after already having transmitted frames for the
 867         * association because the new RXON may reset the information.
 868         */
 869         if (unlikely(ieee80211_is_beacon(fc))) {
 870                 for_each_context(priv, ctx) {
 871                         if (!ctx->last_tx_rejected)
 872                                 continue;
 873                         if (compare_ether_addr(hdr->addr3,
 874                                                ctx->active.bssid_addr))
 875                                 continue;
 876                         ctx->last_tx_rejected = false;
 877                         iwl_wake_any_queue(priv, ctx);
 878                 }
 879         }
 880
 881         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
 882
 883         ieee80211_rx(priv->hw, skb);
 884         rxb->page = NULL;
 885 }
 886
 887 static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
 888 {
 889         u32 decrypt_out = 0;
 890
 891         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
 892                                         RX_RES_STATUS_STATION_FOUND)
 893                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
 894                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
 895
 896         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
 897
 898         /* packet was not encrypted */
 899         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 900                                         RX_RES_STATUS_SEC_TYPE_NONE)
 901                 return decrypt_out;
 902
 903         /* packet was encrypted with unknown alg */
 904         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 905                                         RX_RES_STATUS_SEC_TYPE_ERR)
 906                 return decrypt_out;
 907
 908         /* decryption was not done in HW */
 909         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
 910                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
 911                 return decrypt_out;
 912
 913         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
 914
 915         case RX_RES_STATUS_SEC_TYPE_CCMP:
 916                 /* alg is CCM: check MIC only */
 917                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
 918                         /* Bad MIC */
 919                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 920                 else
 921                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 922
 923                 break;
 924
 925         case RX_RES_STATUS_SEC_TYPE_TKIP:
 926                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
 927                         /* Bad TTAK */
 928                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
 929                         break;
 930                 }
 931                 /* fall through if TTAK OK */
 932         default:
 933                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
 934                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 935                 else
 936                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 937                 break;
 938         }
 939
 940         IWL_DEBUG_RX(priv, "decrypt_in:0x%x  decrypt_out = 0x%x\n",
 941                                         decrypt_in, decrypt_out);
 942
 943         return decrypt_out;
 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 = priv->cfg->ops->utils->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 }