drivers/net/wireless/iwlwifi/iwl-rx.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2010 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_alive(struct iwl_priv *priv,
 229                                struct iwl_rx_mem_buffer *rxb)
 230 {
 231         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 232         struct iwl_alive_resp *palive;
 233         struct delayed_work *pwork;
 234
 235         palive = &pkt->u.alive_frame;
 236
 237         IWL_DEBUG_INFO(priv, "Alive ucode status 0x%08X revision "
 238                        "0x%01X 0x%01X\n",
 239                        palive->is_valid, palive->ver_type,
 240                        palive->ver_subtype);
 241
 242         if (palive->ver_subtype == INITIALIZE_SUBTYPE) {
 243                 IWL_DEBUG_INFO(priv, "Initialization Alive received.\n");
 244                 memcpy(&priv->card_alive_init,
 245                        &pkt->u.alive_frame,
 246                        sizeof(struct iwl_init_alive_resp));
 247                 pwork = &priv->init_alive_start;
 248         } else {
 249                 IWL_DEBUG_INFO(priv, "Runtime Alive received.\n");
 250                 memcpy(&priv->card_alive, &pkt->u.alive_frame,
 251                        sizeof(struct iwl_alive_resp));
 252                 pwork = &priv->alive_start;
 253         }
 254
 255         /* We delay the ALIVE response by 5ms to
 256          * give the HW RF Kill time to activate... */
 257         if (palive->is_valid == UCODE_VALID_OK)
 258                 queue_delayed_work(priv->workqueue, pwork,
 259                                    msecs_to_jiffies(5));
 260         else {
 261                 IWL_WARN(priv, "%s uCode did not respond OK.\n",
 262                         (palive->ver_subtype == INITIALIZE_SUBTYPE) ?
 263                         "init" : "runtime");
 264                 /*
 265                  * If fail to load init uCode,
 266                  * let's try to load the init uCode again.
 267                  * We should not get into this situation, but if it
 268                  * does happen, we should not move on and loading "runtime"
 269                  * without proper calibrate the device.
 270                  */
 271                 if (palive->ver_subtype == INITIALIZE_SUBTYPE)
 272                         priv->ucode_type = UCODE_NONE;
 273                 queue_work(priv->workqueue, &priv->restart);
 274         }
 275 }
 276
 277 static void iwl_rx_reply_error(struct iwl_priv *priv,
 278                                struct iwl_rx_mem_buffer *rxb)
 279 {
 280         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 281
 282         IWL_ERR(priv, "Error Reply type 0x%08X cmd %s (0x%02X) "
 283                 "seq 0x%04X ser 0x%08X\n",
 284                 le32_to_cpu(pkt->u.err_resp.error_type),
 285                 get_cmd_string(pkt->u.err_resp.cmd_id),
 286                 pkt->u.err_resp.cmd_id,
 287                 le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num),
 288                 le32_to_cpu(pkt->u.err_resp.error_info));
 289 }
 290
 291 static void iwl_rx_csa(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
 292 {
 293         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 294         struct iwl_csa_notification *csa = &(pkt->u.csa_notif);
 295         /*
 296          * MULTI-FIXME
 297          * See iwl_mac_channel_switch.
 298          */
 299         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 300         struct iwl_rxon_cmd *rxon = (void *)&ctx->active;
 301
 302         if (priv->switch_rxon.switch_in_progress) {
 303                 if (!le32_to_cpu(csa->status) &&
 304                     (csa->channel == priv->switch_rxon.channel)) {
 305                         rxon->channel = csa->channel;
 306                         ctx->staging.channel = csa->channel;
 307                         IWL_DEBUG_11H(priv, "CSA notif: channel %d\n",
 308                               le16_to_cpu(csa->channel));
 309                         iwl_chswitch_done(priv, true);
 310                 } else {
 311                         IWL_ERR(priv, "CSA notif (fail) : channel %d\n",
 312                               le16_to_cpu(csa->channel));
 313                         iwl_chswitch_done(priv, false);
 314                 }
 315         }
 316 }
 317
 318
 319 static void iwl_rx_spectrum_measure_notif(struct iwl_priv *priv,
 320                                           struct iwl_rx_mem_buffer *rxb)
 321 {
 322         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 323         struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif);
 324
 325         if (!report->state) {
 326                 IWL_DEBUG_11H(priv,
 327                         "Spectrum Measure Notification: Start\n");
 328                 return;
 329         }
 330
 331         memcpy(&priv->measure_report, report, sizeof(*report));
 332         priv->measurement_status |= MEASUREMENT_READY;
 333 }
 334
 335 static void iwl_rx_pm_sleep_notif(struct iwl_priv *priv,
 336                                   struct iwl_rx_mem_buffer *rxb)
 337 {
 338 #ifdef CONFIG_IWLWIFI_DEBUG
 339         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 340         struct iwl_sleep_notification *sleep = &(pkt->u.sleep_notif);
 341         IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n",
 342                      sleep->pm_sleep_mode, sleep->pm_wakeup_src);
 343 #endif
 344 }
 345
 346 static void iwl_rx_pm_debug_statistics_notif(struct iwl_priv *priv,
 347                                              struct iwl_rx_mem_buffer *rxb)
 348 {
 349         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 350         u32 len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
 351         IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled "
 352                         "notification for %s:\n", len,
 353                         get_cmd_string(pkt->hdr.cmd));
 354         iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->u.raw, len);
 355 }
 356
 357 static void iwl_rx_beacon_notif(struct iwl_priv *priv,
 358                                 struct iwl_rx_mem_buffer *rxb)
 359 {
 360         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 361         struct iwlagn_beacon_notif *beacon = (void *)pkt->u.raw;
 362 #ifdef CONFIG_IWLWIFI_DEBUG
 363         u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status);
 364         u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);
 365
 366         IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d "
 367                 "tsf:0x%.8x%.8x rate:%d\n",
 368                 status & TX_STATUS_MSK,
 369                 beacon->beacon_notify_hdr.failure_frame,
 370                 le32_to_cpu(beacon->ibss_mgr_status),
 371                 le32_to_cpu(beacon->high_tsf),
 372                 le32_to_cpu(beacon->low_tsf), rate);
 373 #endif
 374
 375         priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);
 376
 377         if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
 378                 queue_work(priv->workqueue, &priv->beacon_update);
 379 }
 380
 381 /* the threshold ratio of actual_ack_cnt to expected_ack_cnt in percent */
 382 #define ACK_CNT_RATIO (50)
 383 #define BA_TIMEOUT_CNT (5)
 384 #define BA_TIMEOUT_MAX (16)
 385
 386 /**
 387  * iwl_good_ack_health - checks for ACK count ratios, BA timeout retries.
 388  *
 389  * When the ACK count ratio is low and aggregated BA timeout retries exceeding
 390  * the BA_TIMEOUT_MAX, reload firmware and bring system back to normal
 391  * operation state.
 392  */
 393 static bool iwl_good_ack_health(struct iwl_priv *priv, struct iwl_rx_packet *pkt)
 394 {
 395         int actual_delta, expected_delta, ba_timeout_delta;
 396         struct statistics_tx *cur, *old;
 397
 398         if (priv->_agn.agg_tids_count)
 399                 return true;
 400
 401         if (iwl_bt_statistics(priv)) {
 402                 cur = &pkt->u.stats_bt.tx;
 403                 old = &priv->_agn.statistics_bt.tx;
 404         } else {
 405                 cur = &pkt->u.stats.tx;
 406                 old = &priv->_agn.statistics.tx;
 407         }
 408
 409         actual_delta = le32_to_cpu(cur->actual_ack_cnt) -
 410                        le32_to_cpu(old->actual_ack_cnt);
 411         expected_delta = le32_to_cpu(cur->expected_ack_cnt) -
 412                          le32_to_cpu(old->expected_ack_cnt);
 413
 414         /* Values should not be negative, but we do not trust the firmware */
 415         if (actual_delta <= 0 || expected_delta <= 0)
 416                 return true;
 417
 418         ba_timeout_delta = le32_to_cpu(cur->agg.ba_timeout) -
 419                            le32_to_cpu(old->agg.ba_timeout);
 420
 421         if ((actual_delta * 100 / expected_delta) < ACK_CNT_RATIO &&
 422             ba_timeout_delta > BA_TIMEOUT_CNT) {
 423                 IWL_DEBUG_RADIO(priv, "deltas: actual %d expected %d ba_timeout %d\n",
 424                                 actual_delta, expected_delta, ba_timeout_delta);
 425
 426 #ifdef CONFIG_IWLWIFI_DEBUGFS
 427                 /*
 428                  * This is ifdef'ed on DEBUGFS because otherwise the
 429                  * statistics aren't available. If DEBUGFS is set but
 430                  * DEBUG is not, these will just compile out.
 431                  */
 432                 IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta %d\n",
 433                                 priv->_agn.delta_statistics.tx.rx_detected_cnt);
 434                 IWL_DEBUG_RADIO(priv,
 435                                 "ack_or_ba_timeout_collision delta %d\n",
 436                                 priv->_agn.delta_statistics.tx.ack_or_ba_timeout_collision);
 437 #endif
 438
 439                 if (ba_timeout_delta >= BA_TIMEOUT_MAX)
 440                         return false;
 441         }
 442
 443         return true;
 444 }
 445
 446 /**
 447  * iwl_good_plcp_health - checks for plcp error.
 448  *
 449  * When the plcp error is exceeding the thresholds, reset the radio
 450  * to improve the throughput.
 451  */
 452 static bool iwl_good_plcp_health(struct iwl_priv *priv,
 453                                  struct iwl_rx_packet *pkt, unsigned int msecs)
 454 {
 455         int delta;
 456         int threshold = priv->cfg->base_params->plcp_delta_threshold;
 457
 458         if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
 459                 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
 460                 return true;
 461         }
 462
 463         if (iwl_bt_statistics(priv)) {
 464                 struct statistics_rx_bt *cur, *old;
 465
 466                 cur = &pkt->u.stats_bt.rx;
 467                 old = &priv->_agn.statistics_bt.rx;
 468
 469                 delta = le32_to_cpu(cur->ofdm.plcp_err) -
 470                         le32_to_cpu(old->ofdm.plcp_err) +
 471                         le32_to_cpu(cur->ofdm_ht.plcp_err) -
 472                         le32_to_cpu(old->ofdm_ht.plcp_err);
 473         } else {
 474                 struct statistics_rx *cur, *old;
 475
 476                 cur = &pkt->u.stats.rx;
 477                 old = &priv->_agn.statistics.rx;
 478
 479                 delta = le32_to_cpu(cur->ofdm.plcp_err) -
 480                         le32_to_cpu(old->ofdm.plcp_err) +
 481                         le32_to_cpu(cur->ofdm_ht.plcp_err) -
 482                         le32_to_cpu(old->ofdm_ht.plcp_err);
 483         }
 484
 485         /* Can be negative if firmware reseted statistics */
 486         if (delta <= 0)
 487                 return true;
 488
 489         if ((delta * 100 / msecs) > threshold) {
 490                 IWL_DEBUG_RADIO(priv,
 491                                 "plcp health threshold %u delta %d msecs %u\n",
 492                                 threshold, delta, msecs);
 493                 return false;
 494         }
 495
 496         return true;
 497 }
 498
 499 static void iwl_recover_from_statistics(struct iwl_priv *priv,
 500                                         struct iwl_rx_packet *pkt)
 501 {
 502         const struct iwl_mod_params *mod_params = priv->cfg->mod_params;
 503         unsigned int msecs;
 504         unsigned long stamp;
 505
 506         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 507                 return;
 508
 509         stamp = jiffies;
 510         msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies);
 511
 512         /* Only gather statistics and update time stamp when not associated */
 513         if (!iwl_is_any_associated(priv))
 514                 goto out;
 515
 516         /* Do not check/recover when do not have enough statistics data */
 517         if (msecs < 99)
 518                 return;
 519
 520         if (mod_params->ack_check && !iwl_good_ack_health(priv, pkt)) {
 521                 IWL_ERR(priv, "low ack count detected, restart firmware\n");
 522                 if (!iwl_force_reset(priv, IWL_FW_RESET, false))
 523                         return;
 524         }
 525
 526         if (mod_params->plcp_check && !iwl_good_plcp_health(priv, pkt, msecs))
 527                 iwl_force_reset(priv, IWL_RF_RESET, false);
 528
 529 out:
 530         if (iwl_bt_statistics(priv))
 531                 memcpy(&priv->_agn.statistics_bt, &pkt->u.stats_bt,
 532                         sizeof(priv->_agn.statistics_bt));
 533         else
 534                 memcpy(&priv->_agn.statistics, &pkt->u.stats,
 535                         sizeof(priv->_agn.statistics));
 536
 537         priv->rx_statistics_jiffies = stamp;
 538 }
 539
 540 /* Calculate noise level, based on measurements during network silence just
 541  *   before arriving beacon.  This measurement can be done only if we know
 542  *   exactly when to expect beacons, therefore only when we're associated. */
 543 static void iwl_rx_calc_noise(struct iwl_priv *priv)
 544 {
 545         struct statistics_rx_non_phy *rx_info;
 546         int num_active_rx = 0;
 547         int total_silence = 0;
 548         int bcn_silence_a, bcn_silence_b, bcn_silence_c;
 549         int last_rx_noise;
 550
 551         if (iwl_bt_statistics(priv))
 552                 rx_info = &(priv->_agn.statistics_bt.rx.general.common);
 553         else
 554                 rx_info = &(priv->_agn.statistics.rx.general);
 555         bcn_silence_a =
 556                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 557         bcn_silence_b =
 558                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 559         bcn_silence_c =
 560                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 561
 562         if (bcn_silence_a) {
 563                 total_silence += bcn_silence_a;
 564                 num_active_rx++;
 565         }
 566         if (bcn_silence_b) {
 567                 total_silence += bcn_silence_b;
 568                 num_active_rx++;
 569         }
 570         if (bcn_silence_c) {
 571                 total_silence += bcn_silence_c;
 572                 num_active_rx++;
 573         }
 574
 575         /* Average among active antennas */
 576         if (num_active_rx)
 577                 last_rx_noise = (total_silence / num_active_rx) - 107;
 578         else
 579                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 580
 581         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 582                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 583                         last_rx_noise);
 584 }
 585
 586 /*
 587  *  based on the assumption of all statistics counter are in DWORD
 588  *  FIXME: This function is for debugging, do not deal with
 589  *  the case of counters roll-over.
 590  */
 591 static void iwl_accumulative_statistics(struct iwl_priv *priv,
 592                                         __le32 *stats)
 593 {
 594 #ifdef CONFIG_IWLWIFI_DEBUGFS
 595         int i, size;
 596         __le32 *prev_stats;
 597         u32 *accum_stats;
 598         u32 *delta, *max_delta;
 599         struct statistics_general_common *general, *accum_general;
 600         struct statistics_tx *tx, *accum_tx;
 601
 602         if (iwl_bt_statistics(priv)) {
 603                 prev_stats = (__le32 *)&priv->_agn.statistics_bt;
 604                 accum_stats = (u32 *)&priv->_agn.accum_statistics_bt;
 605                 size = sizeof(struct iwl_bt_notif_statistics);
 606                 general = &priv->_agn.statistics_bt.general.common;
 607                 accum_general = &priv->_agn.accum_statistics_bt.general.common;
 608                 tx = &priv->_agn.statistics_bt.tx;
 609                 accum_tx = &priv->_agn.accum_statistics_bt.tx;
 610                 delta = (u32 *)&priv->_agn.delta_statistics_bt;
 611                 max_delta = (u32 *)&priv->_agn.max_delta_bt;
 612         } else {
 613                 prev_stats = (__le32 *)&priv->_agn.statistics;
 614                 accum_stats = (u32 *)&priv->_agn.accum_statistics;
 615                 size = sizeof(struct iwl_notif_statistics);
 616                 general = &priv->_agn.statistics.general.common;
 617                 accum_general = &priv->_agn.accum_statistics.general.common;
 618                 tx = &priv->_agn.statistics.tx;
 619                 accum_tx = &priv->_agn.accum_statistics.tx;
 620                 delta = (u32 *)&priv->_agn.delta_statistics;
 621                 max_delta = (u32 *)&priv->_agn.max_delta;
 622         }
 623         for (i = sizeof(__le32); i < size;
 624              i += sizeof(__le32), stats++, prev_stats++, delta++,
 625              max_delta++, accum_stats++) {
 626                 if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
 627                         *delta = (le32_to_cpu(*stats) -
 628                                 le32_to_cpu(*prev_stats));
 629                         *accum_stats += *delta;
 630                         if (*delta > *max_delta)
 631                                 *max_delta = *delta;
 632                 }
 633         }
 634
 635         /* reset accumulative statistics for "no-counter" type statistics */
 636         accum_general->temperature = general->temperature;
 637         accum_general->temperature_m = general->temperature_m;
 638         accum_general->ttl_timestamp = general->ttl_timestamp;
 639         accum_tx->tx_power.ant_a = tx->tx_power.ant_a;
 640         accum_tx->tx_power.ant_b = tx->tx_power.ant_b;
 641         accum_tx->tx_power.ant_c = tx->tx_power.ant_c;
 642 #endif
 643 }
 644
 645 static void iwl_rx_statistics(struct iwl_priv *priv,
 646                               struct iwl_rx_mem_buffer *rxb)
 647 {
 648         const int reg_recalib_period = 60;
 649         int change;
 650         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 651
 652         if (iwl_bt_statistics(priv)) {
 653                 IWL_DEBUG_RX(priv,
 654                              "Statistics notification received (%d vs %d).\n",
 655                              (int)sizeof(struct iwl_bt_notif_statistics),
 656                              le32_to_cpu(pkt->len_n_flags) &
 657                              FH_RSCSR_FRAME_SIZE_MSK);
 658
 659                 change = ((priv->_agn.statistics_bt.general.common.temperature !=
 660                            pkt->u.stats_bt.general.common.temperature) ||
 661                            ((priv->_agn.statistics_bt.flag &
 662                            STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 663                            (pkt->u.stats_bt.flag &
 664                            STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 665
 666                 iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats_bt);
 667         } else {
 668                 IWL_DEBUG_RX(priv,
 669                              "Statistics notification received (%d vs %d).\n",
 670                              (int)sizeof(struct iwl_notif_statistics),
 671                              le32_to_cpu(pkt->len_n_flags) &
 672                              FH_RSCSR_FRAME_SIZE_MSK);
 673
 674                 change = ((priv->_agn.statistics.general.common.temperature !=
 675                            pkt->u.stats.general.common.temperature) ||
 676                            ((priv->_agn.statistics.flag &
 677                            STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 678                            (pkt->u.stats.flag &
 679                            STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 680
 681                 iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
 682         }
 683
 684         iwl_recover_from_statistics(priv, pkt);
 685
 686         set_bit(STATUS_STATISTICS, &priv->status);
 687
 688         /* Reschedule the statistics timer to occur in
 689          * reg_recalib_period seconds to ensure we get a
 690          * thermal update even if the uCode doesn't give
 691          * us one */
 692         mod_timer(&priv->statistics_periodic, jiffies +
 693                   msecs_to_jiffies(reg_recalib_period * 1000));
 694
 695         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 696             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 697                 iwl_rx_calc_noise(priv);
 698                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 699         }
 700         if (priv->cfg->ops->lib->temp_ops.temperature && change)
 701                 priv->cfg->ops->lib->temp_ops.temperature(priv);
 702 }
 703
 704 static void iwl_rx_reply_statistics(struct iwl_priv *priv,
 705                                     struct iwl_rx_mem_buffer *rxb)
 706 {
 707         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 708
 709         if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
 710 #ifdef CONFIG_IWLWIFI_DEBUGFS
 711                 memset(&priv->_agn.accum_statistics, 0,
 712                         sizeof(struct iwl_notif_statistics));
 713                 memset(&priv->_agn.delta_statistics, 0,
 714                         sizeof(struct iwl_notif_statistics));
 715                 memset(&priv->_agn.max_delta, 0,
 716                         sizeof(struct iwl_notif_statistics));
 717                 memset(&priv->_agn.accum_statistics_bt, 0,
 718                         sizeof(struct iwl_bt_notif_statistics));
 719                 memset(&priv->_agn.delta_statistics_bt, 0,
 720                         sizeof(struct iwl_bt_notif_statistics));
 721                 memset(&priv->_agn.max_delta_bt, 0,
 722                         sizeof(struct iwl_bt_notif_statistics));
 723 #endif
 724                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 725         }
 726         iwl_rx_statistics(priv, rxb);
 727 }
 728
 729 /* Handle notification from uCode that card's power state is changing
 730  * due to software, hardware, or critical temperature RFKILL */
 731 static void iwl_rx_card_state_notif(struct iwl_priv *priv,
 732                                     struct iwl_rx_mem_buffer *rxb)
 733 {
 734         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 735         u32 flags = le32_to_cpu(pkt->u.card_state_notif.flags);
 736         unsigned long status = priv->status;
 737
 738         IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
 739                           (flags & HW_CARD_DISABLED) ? "Kill" : "On",
 740                           (flags & SW_CARD_DISABLED) ? "Kill" : "On",
 741                           (flags & CT_CARD_DISABLED) ?
 742                           "Reached" : "Not reached");
 743
 744         if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
 745                      CT_CARD_DISABLED)) {
 746
 747                 iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
 748                             CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 749
 750                 iwl_write_direct32(priv, HBUS_TARG_MBX_C,
 751                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 752
 753                 if (!(flags & RXON_CARD_DISABLED)) {
 754                         iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
 755                                     CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 756                         iwl_write_direct32(priv, HBUS_TARG_MBX_C,
 757                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 758                 }
 759                 if (flags & CT_CARD_DISABLED)
 760                         iwl_tt_enter_ct_kill(priv);
 761         }
 762         if (!(flags & CT_CARD_DISABLED))
 763                 iwl_tt_exit_ct_kill(priv);
 764
 765         if (flags & HW_CARD_DISABLED)
 766                 set_bit(STATUS_RF_KILL_HW, &priv->status);
 767         else
 768                 clear_bit(STATUS_RF_KILL_HW, &priv->status);
 769
 770
 771         if (!(flags & RXON_CARD_DISABLED))
 772                 iwl_scan_cancel(priv);
 773
 774         if ((test_bit(STATUS_RF_KILL_HW, &status) !=
 775              test_bit(STATUS_RF_KILL_HW, &priv->status)))
 776                 wiphy_rfkill_set_hw_state(priv->hw->wiphy,
 777                         test_bit(STATUS_RF_KILL_HW, &priv->status));
 778         else
 779                 wake_up_interruptible(&priv->wait_command_queue);
 780 }
 781
 782 static void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
 783                                        struct iwl_rx_mem_buffer *rxb)
 784
 785 {
 786         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 787         struct iwl_missed_beacon_notif *missed_beacon;
 788
 789         missed_beacon = &pkt->u.missed_beacon;
 790         if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
 791             priv->missed_beacon_threshold) {
 792                 IWL_DEBUG_CALIB(priv,
 793                     "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 794                     le32_to_cpu(missed_beacon->consecutive_missed_beacons),
 795                     le32_to_cpu(missed_beacon->total_missed_becons),
 796                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 797                     le32_to_cpu(missed_beacon->num_expected_beacons));
 798                 if (!test_bit(STATUS_SCANNING, &priv->status))
 799                         iwl_init_sensitivity(priv);
 800         }
 801 }
 802
 803 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
 804  * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
 805 static void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
 806                                 struct iwl_rx_mem_buffer *rxb)
 807 {
 808         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 809
 810         priv->_agn.last_phy_res_valid = true;
 811         memcpy(&priv->_agn.last_phy_res, pkt->u.raw,
 812                sizeof(struct iwl_rx_phy_res));
 813 }
 814
 815 /*
 816  * returns non-zero if packet should be dropped
 817  */
 818 static int iwl_set_decrypted_flag(struct iwl_priv *priv,
 819                                   struct ieee80211_hdr *hdr,
 820                                   u32 decrypt_res,
 821                                   struct ieee80211_rx_status *stats)
 822 {
 823         u16 fc = le16_to_cpu(hdr->frame_control);
 824
 825         /*
 826          * All contexts have the same setting here due to it being
 827          * a module parameter, so OK to check any context.
 828          */
 829         if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags &
 830                                                 RXON_FILTER_DIS_DECRYPT_MSK)
 831                 return 0;
 832
 833         if (!(fc & IEEE80211_FCTL_PROTECTED))
 834                 return 0;
 835
 836         IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
 837         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 838         case RX_RES_STATUS_SEC_TYPE_TKIP:
 839                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 840                  * Decryption will be done in SW. */
 841                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 842                     RX_RES_STATUS_BAD_KEY_TTAK)
 843                         break;
 844
 845         case RX_RES_STATUS_SEC_TYPE_WEP:
 846                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 847                     RX_RES_STATUS_BAD_ICV_MIC) {
 848                         /* bad ICV, the packet is destroyed since the
 849                          * decryption is inplace, drop it */
 850                         IWL_DEBUG_RX(priv, "Packet destroyed\n");
 851                         return -1;
 852                 }
 853         case RX_RES_STATUS_SEC_TYPE_CCMP:
 854                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 855                     RX_RES_STATUS_DECRYPT_OK) {
 856                         IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
 857                         stats->flag |= RX_FLAG_DECRYPTED;
 858                 }
 859                 break;
 860
 861         default:
 862                 break;
 863         }
 864         return 0;
 865 }
 866
 867 static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 868                                         struct ieee80211_hdr *hdr,
 869                                         u16 len,
 870                                         u32 ampdu_status,
 871                                         struct iwl_rx_mem_buffer *rxb,
 872                                         struct ieee80211_rx_status *stats)
 873 {
 874         struct sk_buff *skb;
 875         __le16 fc = hdr->frame_control;
 876
 877         /* We only process data packets if the interface is open */
 878         if (unlikely(!priv->is_open)) {
 879                 IWL_DEBUG_DROP_LIMIT(priv,
 880                     "Dropping packet while interface is not open.\n");
 881                 return;
 882         }
 883
 884         /* In case of HW accelerated crypto and bad decryption, drop */
 885         if (!priv->cfg->mod_params->sw_crypto &&
 886             iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
 887                 return;
 888
 889         skb = dev_alloc_skb(128);
 890         if (!skb) {
 891                 IWL_ERR(priv, "dev_alloc_skb failed\n");
 892                 return;
 893         }
 894
 895         skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
 896
 897         iwl_update_stats(priv, false, fc, len);
 898         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
 899
 900         ieee80211_rx(priv->hw, skb);
 901         priv->alloc_rxb_page--;
 902         rxb->page = NULL;
 903 }
 904
 905 static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
 906 {
 907         u32 decrypt_out = 0;
 908
 909         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
 910                                         RX_RES_STATUS_STATION_FOUND)
 911                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
 912                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
 913
 914         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
 915
 916         /* packet was not encrypted */
 917         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 918                                         RX_RES_STATUS_SEC_TYPE_NONE)
 919                 return decrypt_out;
 920
 921         /* packet was encrypted with unknown alg */
 922         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 923                                         RX_RES_STATUS_SEC_TYPE_ERR)
 924                 return decrypt_out;
 925
 926         /* decryption was not done in HW */
 927         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
 928                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
 929                 return decrypt_out;
 930
 931         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
 932
 933         case RX_RES_STATUS_SEC_TYPE_CCMP:
 934                 /* alg is CCM: check MIC only */
 935                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
 936                         /* Bad MIC */
 937                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 938                 else
 939                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 940
 941                 break;
 942
 943         case RX_RES_STATUS_SEC_TYPE_TKIP:
 944                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
 945                         /* Bad TTAK */
 946                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
 947                         break;
 948                 }
 949                 /* fall through if TTAK OK */
 950         default:
 951                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
 952                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 953                 else
 954                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 955                 break;
 956         }
 957
 958         IWL_DEBUG_RX(priv, "decrypt_in:0x%x  decrypt_out = 0x%x\n",
 959                                         decrypt_in, decrypt_out);
 960
 961         return decrypt_out;
 962 }
 963
 964 /* Called for REPLY_RX (legacy ABG frames), or
 965  * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
 966 static void iwl_rx_reply_rx(struct iwl_priv *priv,
 967                             struct iwl_rx_mem_buffer *rxb)
 968 {
 969         struct ieee80211_hdr *header;
 970         struct ieee80211_rx_status rx_status;
 971         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 972         struct iwl_rx_phy_res *phy_res;
 973         __le32 rx_pkt_status;
 974         struct iwl_rx_mpdu_res_start *amsdu;
 975         u32 len;
 976         u32 ampdu_status;
 977         u32 rate_n_flags;
 978
 979         /**
 980          * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
 981          *      REPLY_RX: physical layer info is in this buffer
 982          *      REPLY_RX_MPDU_CMD: physical layer info was sent in separate
 983          *              command and cached in priv->last_phy_res
 984          *
 985          * Here we set up local variables depending on which command is
 986          * received.
 987          */
 988         if (pkt->hdr.cmd == REPLY_RX) {
 989                 phy_res = (struct iwl_rx_phy_res *)pkt->u.raw;
 990                 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res)
 991                                 + phy_res->cfg_phy_cnt);
 992
 993                 len = le16_to_cpu(phy_res->byte_count);
 994                 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) +
 995                                 phy_res->cfg_phy_cnt + len);
 996                 ampdu_status = le32_to_cpu(rx_pkt_status);
 997         } else {
 998                 if (!priv->_agn.last_phy_res_valid) {
 999                         IWL_ERR(priv, "MPDU frame without cached PHY data\n");
1000                         return;
1001                 }
1002                 phy_res = &priv->_agn.last_phy_res;
1003                 amsdu = (struct iwl_rx_mpdu_res_start *)pkt->u.raw;
1004                 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu));
1005                 len = le16_to_cpu(amsdu->byte_count);
1006                 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len);
1007                 ampdu_status = iwl_translate_rx_status(priv,
1008                                                 le32_to_cpu(rx_pkt_status));
1009         }
1010
1011         if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
1012                 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n",
1013                                 phy_res->cfg_phy_cnt);
1014                 return;
1015         }
1016
1017         if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
1018             !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
1019                 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
1020                                 le32_to_cpu(rx_pkt_status));
1021                 return;
1022         }
1023
1024         /* This will be used in several places later */
1025         rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
1026
1027         /* rx_status carries information about the packet to mac80211 */
1028         rx_status.mactime = le64_to_cpu(phy_res->timestamp);
1029         rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
1030                                 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
1031         rx_status.freq =
1032                 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel),
1033                                                rx_status.band);
1034         rx_status.rate_idx =
1035                 iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
1036         rx_status.flag = 0;
1037
1038         /* TSF isn't reliable. In order to allow smooth user experience,
1039          * this W/A doesn't propagate it to the mac80211 */
1040         /*rx_status.flag |= RX_FLAG_MACTIME_MPDU;*/
1041
1042         priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
1043
1044         /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1045         rx_status.signal = priv->cfg->ops->utils->calc_rssi(priv, phy_res);
1046
1047         iwl_dbg_log_rx_data_frame(priv, len, header);
1048         IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n",
1049                 rx_status.signal, (unsigned long long)rx_status.mactime);
1050
1051         /*
1052          * "antenna number"
1053          *
1054          * It seems that the antenna field in the phy flags value
1055          * is actually a bit field. This is undefined by radiotap,
1056          * it wants an actual antenna number but I always get "7"
1057          * for most legacy frames I receive indicating that the
1058          * same frame was received on all three RX chains.
1059          *
1060          * I think this field should be removed in favor of a
1061          * new 802.11n radiotap field "RX chains" that is defined
1062          * as a bitmask.
1063          */
1064         rx_status.antenna =
1065                 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
1066                 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
1067
1068         /* set the preamble flag if appropriate */
1069         if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
1070                 rx_status.flag |= RX_FLAG_SHORTPRE;
1071
1072         /* Set up the HT phy flags */
1073         if (rate_n_flags & RATE_MCS_HT_MSK)
1074                 rx_status.flag |= RX_FLAG_HT;
1075         if (rate_n_flags & RATE_MCS_HT40_MSK)
1076                 rx_status.flag |= RX_FLAG_40MHZ;
1077         if (rate_n_flags & RATE_MCS_SGI_MSK)
1078                 rx_status.flag |= RX_FLAG_SHORT_GI;
1079
1080         iwl_pass_packet_to_mac80211(priv, header, len, ampdu_status,
1081                                     rxb, &rx_status);
1082 }
1083
1084 /**
1085  * iwl_setup_rx_handlers - Initialize Rx handler callbacks
1086  *
1087  * Setup the RX handlers for each of the reply types sent from the uCode
1088  * to the host.
1089  */
1090 void iwl_setup_rx_handlers(struct iwl_priv *priv)
1091 {
1092         void (**handlers)(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb);
1093
1094         handlers = priv->rx_handlers;
1095
1096         handlers[REPLY_ALIVE]                   = iwl_rx_reply_alive;
1097         handlers[REPLY_ERROR]                   = iwl_rx_reply_error;
1098         handlers[CHANNEL_SWITCH_NOTIFICATION]   = iwl_rx_csa;
1099         handlers[SPECTRUM_MEASURE_NOTIFICATION] = iwl_rx_spectrum_measure_notif;
1100         handlers[PM_SLEEP_NOTIFICATION]         = iwl_rx_pm_sleep_notif;
1101         handlers[PM_DEBUG_STATISTIC_NOTIFIC]    = iwl_rx_pm_debug_statistics_notif;
1102         handlers[BEACON_NOTIFICATION]           = iwl_rx_beacon_notif;
1103
1104         /*
1105          * The same handler is used for both the REPLY to a discrete
1106          * statistics request from the host as well as for the periodic
1107          * statistics notifications (after received beacons) from the uCode.
1108          */
1109         handlers[REPLY_STATISTICS_CMD]          = iwl_rx_reply_statistics;
1110         handlers[STATISTICS_NOTIFICATION]       = iwl_rx_statistics;
1111
1112         iwl_setup_rx_scan_handlers(priv);
1113
1114         handlers[CARD_STATE_NOTIFICATION]       = iwl_rx_card_state_notif;
1115         handlers[MISSED_BEACONS_NOTIFICATION]   = iwl_rx_missed_beacon_notif;
1116
1117         /* Rx handlers */
1118         handlers[REPLY_RX_PHY_CMD]              = iwl_rx_reply_rx_phy;
1119         handlers[REPLY_RX_MPDU_CMD]             = iwl_rx_reply_rx;
1120
1121         /* block ack */
1122         handlers[REPLY_COMPRESSED_BA]           = iwlagn_rx_reply_compressed_ba;
1123
1124         /* Set up hardware specific Rx handlers */
1125         priv->cfg->ops->lib->rx_handler_setup(priv);
1126 }