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 <net/mac80211.h>
  33 #include <asm/unaligned.h>
  34 #include "iwl-eeprom.h"
  35 #include "iwl-dev.h"
  36 #include "iwl-core.h"
  37 #include "iwl-sta.h"
  38 #include "iwl-io.h"
  39 #include "iwl-helpers.h"
  40 #include "iwl-agn-calib.h"
  41 /************************** RX-FUNCTIONS ****************************/
  42 /*
  43  * Rx theory of operation
  44  *
  45  * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
  46  * each of which point to Receive Buffers to be filled by the NIC.  These get
  47  * used not only for Rx frames, but for any command response or notification
  48  * from the NIC.  The driver and NIC manage the Rx buffers by means
  49  * of indexes into the circular buffer.
  50  *
  51  * Rx Queue Indexes
  52  * The host/firmware share two index registers for managing the Rx buffers.
  53  *
  54  * The READ index maps to the first position that the firmware may be writing
  55  * to -- the driver can read up to (but not including) this position and get
  56  * good data.
  57  * The READ index is managed by the firmware once the card is enabled.
  58  *
  59  * The WRITE index maps to the last position the driver has read from -- the
  60  * position preceding WRITE is the last slot the firmware can place a packet.
  61  *
  62  * The queue is empty (no good data) if WRITE = READ - 1, and is full if
  63  * WRITE = READ.
  64  *
  65  * During initialization, the host sets up the READ queue position to the first
  66  * INDEX position, and WRITE to the last (READ - 1 wrapped)
  67  *
  68  * When the firmware places a packet in a buffer, it will advance the READ index
  69  * and fire the RX interrupt.  The driver can then query the READ index and
  70  * process as many packets as possible, moving the WRITE index forward as it
  71  * resets the Rx queue buffers with new memory.
  72  *
  73  * The management in the driver is as follows:
  74  * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
  75  *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
  76  *   to replenish the iwl->rxq->rx_free.
  77  * + In iwl_rx_replenish (scheduled) if 'processed' != 'read' then the
  78  *   iwl->rxq is replenished and the READ INDEX is updated (updating the
  79  *   'processed' and 'read' driver indexes as well)
  80  * + A received packet is processed and handed to the kernel network stack,
  81  *   detached from the iwl->rxq.  The driver 'processed' index is updated.
  82  * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
  83  *   list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
  84  *   INDEX is not incremented and iwl->status(RX_STALLED) is set.  If there
  85  *   were enough free buffers and RX_STALLED is set it is cleared.
  86  *
  87  *
  88  * Driver sequence:
  89  *
  90  * iwl_rx_queue_alloc()   Allocates rx_free
  91  * iwl_rx_replenish()     Replenishes rx_free list from rx_used, and calls
  92  *                            iwl_rx_queue_restock
  93  * iwl_rx_queue_restock() Moves available buffers from rx_free into Rx
  94  *                            queue, updates firmware pointers, and updates
  95  *                            the WRITE index.  If insufficient rx_free buffers
  96  *                            are available, schedules iwl_rx_replenish
  97  *
  98  * -- enable interrupts --
  99  * ISR - iwl_rx()         Detach iwl_rx_mem_buffers from pool up to the
 100  *                            READ INDEX, detaching the SKB from the pool.
 101  *                            Moves the packet buffer from queue to rx_used.
 102  *                            Calls iwl_rx_queue_restock to refill any empty
 103  *                            slots.
 104  * ...
 105  *
 106  */
 107
 108 /**
 109  * iwl_rx_queue_space - Return number of free slots available in queue.
 110  */
 111 int iwl_rx_queue_space(const struct iwl_rx_queue *q)
 112 {
 113         int s = q->read - q->write;
 114         if (s <= 0)
 115                 s += RX_QUEUE_SIZE;
 116         /* keep some buffer to not confuse full and empty queue */
 117         s -= 2;
 118         if (s < 0)
 119                 s = 0;
 120         return s;
 121 }
 122
 123 /**
 124  * iwl_rx_queue_update_write_ptr - Update the write pointer for the RX queue
 125  */
 126 void iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q)
 127 {
 128         unsigned long flags;
 129         u32 rx_wrt_ptr_reg = priv->hw_params.rx_wrt_ptr_reg;
 130         u32 reg;
 131
 132         spin_lock_irqsave(&q->lock, flags);
 133
 134         if (q->need_update == 0)
 135                 goto exit_unlock;
 136
 137         if (priv->cfg->base_params->shadow_reg_enable) {
 138                 /* shadow register enabled */
 139                 /* Device expects a multiple of 8 */
 140                 q->write_actual = (q->write & ~0x7);
 141                 iwl_write32(priv, rx_wrt_ptr_reg, q->write_actual);
 142         } else {
 143                 /* If power-saving is in use, make sure device is awake */
 144                 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
 145                         reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
 146
 147                         if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
 148                                 IWL_DEBUG_INFO(priv,
 149                                         "Rx queue requesting wakeup,"
 150                                         " GP1 = 0x%x\n", reg);
 151                                 iwl_set_bit(priv, CSR_GP_CNTRL,
 152                                         CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 153                                 goto exit_unlock;
 154                         }
 155
 156                         q->write_actual = (q->write & ~0x7);
 157                         iwl_write_direct32(priv, rx_wrt_ptr_reg,
 158                                         q->write_actual);
 159
 160                 /* Else device is assumed to be awake */
 161                 } else {
 162                         /* Device expects a multiple of 8 */
 163                         q->write_actual = (q->write & ~0x7);
 164                         iwl_write_direct32(priv, rx_wrt_ptr_reg,
 165                                 q->write_actual);
 166                 }
 167         }
 168         q->need_update = 0;
 169
 170  exit_unlock:
 171         spin_unlock_irqrestore(&q->lock, flags);
 172 }
 173
 174 int iwl_rx_queue_alloc(struct iwl_priv *priv)
 175 {
 176         struct iwl_rx_queue *rxq = &priv->rxq;
 177         struct device *dev = &priv->pci_dev->dev;
 178         int i;
 179
 180         spin_lock_init(&rxq->lock);
 181         INIT_LIST_HEAD(&rxq->rx_free);
 182         INIT_LIST_HEAD(&rxq->rx_used);
 183
 184         /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
 185         rxq->bd = dma_alloc_coherent(dev, 4 * RX_QUEUE_SIZE, &rxq->bd_dma,
 186                                      GFP_KERNEL);
 187         if (!rxq->bd)
 188                 goto err_bd;
 189
 190         rxq->rb_stts = dma_alloc_coherent(dev, sizeof(struct iwl_rb_status),
 191                                           &rxq->rb_stts_dma, GFP_KERNEL);
 192         if (!rxq->rb_stts)
 193                 goto err_rb;
 194
 195         /* Fill the rx_used queue with _all_ of the Rx buffers */
 196         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
 197                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 198
 199         /* Set us so that we have processed and used all buffers, but have
 200          * not restocked the Rx queue with fresh buffers */
 201         rxq->read = rxq->write = 0;
 202         rxq->write_actual = 0;
 203         rxq->free_count = 0;
 204         rxq->need_update = 0;
 205         return 0;
 206
 207 err_rb:
 208         dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
 209                           rxq->bd_dma);
 210 err_bd:
 211         return -ENOMEM;
 212 }
 213
 214 void iwl_rx_spectrum_measure_notif(struct iwl_priv *priv,
 215                                           struct iwl_rx_mem_buffer *rxb)
 216 {
 217         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 218         struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif);
 219
 220         if (!report->state) {
 221                 IWL_DEBUG_11H(priv,
 222                         "Spectrum Measure Notification: Start\n");
 223                 return;
 224         }
 225
 226         memcpy(&priv->measure_report, report, sizeof(*report));
 227         priv->measurement_status |= MEASUREMENT_READY;
 228 }
 229
 230 /* the threshold ratio of actual_ack_cnt to expected_ack_cnt in percent */
 231 #define ACK_CNT_RATIO (50)
 232 #define BA_TIMEOUT_CNT (5)
 233 #define BA_TIMEOUT_MAX (16)
 234
 235 /**
 236  * iwl_good_ack_health - checks for ACK count ratios, BA timeout retries.
 237  *
 238  * When the ACK count ratio is low and aggregated BA timeout retries exceeding
 239  * the BA_TIMEOUT_MAX, reload firmware and bring system back to normal
 240  * operation state.
 241  */
 242 static bool iwl_good_ack_health(struct iwl_priv *priv, struct iwl_rx_packet *pkt)
 243 {
 244         int actual_delta, expected_delta, ba_timeout_delta;
 245         struct statistics_tx *cur, *old;
 246
 247         if (priv->_agn.agg_tids_count)
 248                 return true;
 249
 250         if (iwl_bt_statistics(priv)) {
 251                 cur = &pkt->u.stats_bt.tx;
 252                 old = &priv->_agn.statistics_bt.tx;
 253         } else {
 254                 cur = &pkt->u.stats.tx;
 255                 old = &priv->_agn.statistics.tx;
 256         }
 257
 258         actual_delta = le32_to_cpu(cur->actual_ack_cnt) -
 259                        le32_to_cpu(old->actual_ack_cnt);
 260         expected_delta = le32_to_cpu(cur->expected_ack_cnt) -
 261                          le32_to_cpu(old->expected_ack_cnt);
 262
 263         /* Values should not be negative, but we do not trust the firmware */
 264         if (actual_delta <= 0 || expected_delta <= 0)
 265                 return true;
 266
 267         ba_timeout_delta = le32_to_cpu(cur->agg.ba_timeout) -
 268                            le32_to_cpu(old->agg.ba_timeout);
 269
 270         if ((actual_delta * 100 / expected_delta) < ACK_CNT_RATIO &&
 271             ba_timeout_delta > BA_TIMEOUT_CNT) {
 272                 IWL_DEBUG_RADIO(priv, "deltas: actual %d expected %d ba_timeout %d\n",
 273                                 actual_delta, expected_delta, ba_timeout_delta);
 274
 275 #ifdef CONFIG_IWLWIFI_DEBUGFS
 276                 /*
 277                  * This is ifdef'ed on DEBUGFS because otherwise the
 278                  * statistics aren't available. If DEBUGFS is set but
 279                  * DEBUG is not, these will just compile out.
 280                  */
 281                 IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta %d\n",
 282                                 priv->_agn.delta_statistics.tx.rx_detected_cnt);
 283                 IWL_DEBUG_RADIO(priv,
 284                                 "ack_or_ba_timeout_collision delta %d\n",
 285                                 priv->_agn.delta_statistics.tx.ack_or_ba_timeout_collision);
 286 #endif
 287
 288                 if (ba_timeout_delta >= BA_TIMEOUT_MAX)
 289                         return false;
 290         }
 291
 292         return true;
 293 }
 294
 295 /**
 296  * iwl_good_plcp_health - checks for plcp error.
 297  *
 298  * When the plcp error is exceeding the thresholds, reset the radio
 299  * to improve the throughput.
 300  */
 301 static bool iwl_good_plcp_health(struct iwl_priv *priv, struct iwl_rx_packet *pkt)
 302 {
 303         bool rc = true;
 304         int combined_plcp_delta;
 305         unsigned int plcp_msec;
 306         unsigned long plcp_received_jiffies;
 307
 308         if (priv->cfg->base_params->plcp_delta_threshold ==
 309             IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
 310                 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
 311                 return rc;
 312         }
 313
 314         /*
 315          * check for plcp_err and trigger radio reset if it exceeds
 316          * the plcp error threshold plcp_delta.
 317          */
 318         plcp_received_jiffies = jiffies;
 319         plcp_msec = jiffies_to_msecs((long) plcp_received_jiffies -
 320                                         (long) priv->plcp_jiffies);
 321         priv->plcp_jiffies = plcp_received_jiffies;
 322         /*
 323          * check to make sure plcp_msec is not 0 to prevent division
 324          * by zero.
 325          */
 326         if (plcp_msec) {
 327                 struct statistics_rx_phy *ofdm;
 328                 struct statistics_rx_ht_phy *ofdm_ht;
 329
 330                 if (iwl_bt_statistics(priv)) {
 331                         ofdm = &pkt->u.stats_bt.rx.ofdm;
 332                         ofdm_ht = &pkt->u.stats_bt.rx.ofdm_ht;
 333                         combined_plcp_delta =
 334                            (le32_to_cpu(ofdm->plcp_err) -
 335                            le32_to_cpu(priv->_agn.statistics_bt.
 336                                        rx.ofdm.plcp_err)) +
 337                            (le32_to_cpu(ofdm_ht->plcp_err) -
 338                            le32_to_cpu(priv->_agn.statistics_bt.
 339                                        rx.ofdm_ht.plcp_err));
 340                 } else {
 341                         ofdm = &pkt->u.stats.rx.ofdm;
 342                         ofdm_ht = &pkt->u.stats.rx.ofdm_ht;
 343                         combined_plcp_delta =
 344                             (le32_to_cpu(ofdm->plcp_err) -
 345                             le32_to_cpu(priv->_agn.statistics.
 346                                         rx.ofdm.plcp_err)) +
 347                             (le32_to_cpu(ofdm_ht->plcp_err) -
 348                             le32_to_cpu(priv->_agn.statistics.
 349                                         rx.ofdm_ht.plcp_err));
 350                 }
 351
 352                 if ((combined_plcp_delta > 0) &&
 353                     ((combined_plcp_delta * 100) / plcp_msec) >
 354                         priv->cfg->base_params->plcp_delta_threshold) {
 355                         /*
 356                          * if plcp_err exceed the threshold,
 357                          * the following data is printed in csv format:
 358                          *    Text: plcp_err exceeded %d,
 359                          *    Received ofdm.plcp_err,
 360                          *    Current ofdm.plcp_err,
 361                          *    Received ofdm_ht.plcp_err,
 362                          *    Current ofdm_ht.plcp_err,
 363                          *    combined_plcp_delta,
 364                          *    plcp_msec
 365                          */
 366                         IWL_DEBUG_RADIO(priv, "plcp_err exceeded %u, "
 367                                 "%u, %u, %u, %u, %d, %u mSecs\n",
 368                                 priv->cfg->base_params->plcp_delta_threshold,
 369                                 le32_to_cpu(ofdm->plcp_err),
 370                                 le32_to_cpu(ofdm->plcp_err),
 371                                 le32_to_cpu(ofdm_ht->plcp_err),
 372                                 le32_to_cpu(ofdm_ht->plcp_err),
 373                                 combined_plcp_delta, plcp_msec);
 374
 375                         rc = false;
 376                 }
 377         }
 378         return rc;
 379 }
 380
 381 static void iwl_recover_from_statistics(struct iwl_priv *priv, struct iwl_rx_packet *pkt)
 382 {
 383         const struct iwl_mod_params *mod_params = priv->cfg->mod_params;
 384
 385         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 386             !iwl_is_any_associated(priv))
 387                 return;
 388
 389         if (mod_params->ack_check && !iwl_good_ack_health(priv, pkt)) {
 390                 IWL_ERR(priv, "low ack count detected, restart firmware\n");
 391                 if (!iwl_force_reset(priv, IWL_FW_RESET, false))
 392                         return;
 393         }
 394
 395         if (mod_params->plcp_check && !iwl_good_plcp_health(priv, pkt))
 396                 iwl_force_reset(priv, IWL_RF_RESET, false);
 397 }
 398
 399 /* Calculate noise level, based on measurements during network silence just
 400  *   before arriving beacon.  This measurement can be done only if we know
 401  *   exactly when to expect beacons, therefore only when we're associated. */
 402 static void iwl_rx_calc_noise(struct iwl_priv *priv)
 403 {
 404         struct statistics_rx_non_phy *rx_info;
 405         int num_active_rx = 0;
 406         int total_silence = 0;
 407         int bcn_silence_a, bcn_silence_b, bcn_silence_c;
 408         int last_rx_noise;
 409
 410         if (iwl_bt_statistics(priv))
 411                 rx_info = &(priv->_agn.statistics_bt.rx.general.common);
 412         else
 413                 rx_info = &(priv->_agn.statistics.rx.general);
 414         bcn_silence_a =
 415                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 416         bcn_silence_b =
 417                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 418         bcn_silence_c =
 419                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 420
 421         if (bcn_silence_a) {
 422                 total_silence += bcn_silence_a;
 423                 num_active_rx++;
 424         }
 425         if (bcn_silence_b) {
 426                 total_silence += bcn_silence_b;
 427                 num_active_rx++;
 428         }
 429         if (bcn_silence_c) {
 430                 total_silence += bcn_silence_c;
 431                 num_active_rx++;
 432         }
 433
 434         /* Average among active antennas */
 435         if (num_active_rx)
 436                 last_rx_noise = (total_silence / num_active_rx) - 107;
 437         else
 438                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 439
 440         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 441                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 442                         last_rx_noise);
 443 }
 444
 445 #ifdef CONFIG_IWLWIFI_DEBUGFS
 446 /*
 447  *  based on the assumption of all statistics counter are in DWORD
 448  *  FIXME: This function is for debugging, do not deal with
 449  *  the case of counters roll-over.
 450  */
 451 static void iwl_accumulative_statistics(struct iwl_priv *priv,
 452                                         __le32 *stats)
 453 {
 454         int i, size;
 455         __le32 *prev_stats;
 456         u32 *accum_stats;
 457         u32 *delta, *max_delta;
 458         struct statistics_general_common *general, *accum_general;
 459         struct statistics_tx *tx, *accum_tx;
 460
 461         if (iwl_bt_statistics(priv)) {
 462                 prev_stats = (__le32 *)&priv->_agn.statistics_bt;
 463                 accum_stats = (u32 *)&priv->_agn.accum_statistics_bt;
 464                 size = sizeof(struct iwl_bt_notif_statistics);
 465                 general = &priv->_agn.statistics_bt.general.common;
 466                 accum_general = &priv->_agn.accum_statistics_bt.general.common;
 467                 tx = &priv->_agn.statistics_bt.tx;
 468                 accum_tx = &priv->_agn.accum_statistics_bt.tx;
 469                 delta = (u32 *)&priv->_agn.delta_statistics_bt;
 470                 max_delta = (u32 *)&priv->_agn.max_delta_bt;
 471         } else {
 472                 prev_stats = (__le32 *)&priv->_agn.statistics;
 473                 accum_stats = (u32 *)&priv->_agn.accum_statistics;
 474                 size = sizeof(struct iwl_notif_statistics);
 475                 general = &priv->_agn.statistics.general.common;
 476                 accum_general = &priv->_agn.accum_statistics.general.common;
 477                 tx = &priv->_agn.statistics.tx;
 478                 accum_tx = &priv->_agn.accum_statistics.tx;
 479                 delta = (u32 *)&priv->_agn.delta_statistics;
 480                 max_delta = (u32 *)&priv->_agn.max_delta;
 481         }
 482         for (i = sizeof(__le32); i < size;
 483              i += sizeof(__le32), stats++, prev_stats++, delta++,
 484              max_delta++, accum_stats++) {
 485                 if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
 486                         *delta = (le32_to_cpu(*stats) -
 487                                 le32_to_cpu(*prev_stats));
 488                         *accum_stats += *delta;
 489                         if (*delta > *max_delta)
 490                                 *max_delta = *delta;
 491                 }
 492         }
 493
 494         /* reset accumulative statistics for "no-counter" type statistics */
 495         accum_general->temperature = general->temperature;
 496         accum_general->temperature_m = general->temperature_m;
 497         accum_general->ttl_timestamp = general->ttl_timestamp;
 498         accum_tx->tx_power.ant_a = tx->tx_power.ant_a;
 499         accum_tx->tx_power.ant_b = tx->tx_power.ant_b;
 500         accum_tx->tx_power.ant_c = tx->tx_power.ant_c;
 501 }
 502 #endif
 503
 504 #define REG_RECALIB_PERIOD (60)
 505
 506 void iwl_rx_statistics(struct iwl_priv *priv,
 507                               struct iwl_rx_mem_buffer *rxb)
 508 {
 509         int change;
 510         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 511
 512         if (iwl_bt_statistics(priv)) {
 513                 IWL_DEBUG_RX(priv,
 514                              "Statistics notification received (%d vs %d).\n",
 515                              (int)sizeof(struct iwl_bt_notif_statistics),
 516                              le32_to_cpu(pkt->len_n_flags) &
 517                              FH_RSCSR_FRAME_SIZE_MSK);
 518
 519                 change = ((priv->_agn.statistics_bt.general.common.temperature !=
 520                            pkt->u.stats_bt.general.common.temperature) ||
 521                            ((priv->_agn.statistics_bt.flag &
 522                            STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 523                            (pkt->u.stats_bt.flag &
 524                            STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 525 #ifdef CONFIG_IWLWIFI_DEBUGFS
 526                 iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats_bt);
 527 #endif
 528
 529         } else {
 530                 IWL_DEBUG_RX(priv,
 531                              "Statistics notification received (%d vs %d).\n",
 532                              (int)sizeof(struct iwl_notif_statistics),
 533                              le32_to_cpu(pkt->len_n_flags) &
 534                              FH_RSCSR_FRAME_SIZE_MSK);
 535
 536                 change = ((priv->_agn.statistics.general.common.temperature !=
 537                            pkt->u.stats.general.common.temperature) ||
 538                            ((priv->_agn.statistics.flag &
 539                            STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 540                            (pkt->u.stats.flag &
 541                            STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 542 #ifdef CONFIG_IWLWIFI_DEBUGFS
 543                 iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
 544 #endif
 545
 546         }
 547
 548         iwl_recover_from_statistics(priv, pkt);
 549
 550         if (iwl_bt_statistics(priv))
 551                 memcpy(&priv->_agn.statistics_bt, &pkt->u.stats_bt,
 552                         sizeof(priv->_agn.statistics_bt));
 553         else
 554                 memcpy(&priv->_agn.statistics, &pkt->u.stats,
 555                         sizeof(priv->_agn.statistics));
 556
 557         set_bit(STATUS_STATISTICS, &priv->status);
 558
 559         /* Reschedule the statistics timer to occur in
 560          * REG_RECALIB_PERIOD seconds to ensure we get a
 561          * thermal update even if the uCode doesn't give
 562          * us one */
 563         mod_timer(&priv->statistics_periodic, jiffies +
 564                   msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
 565
 566         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 567             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 568                 iwl_rx_calc_noise(priv);
 569                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 570         }
 571         if (priv->cfg->ops->lib->temp_ops.temperature && change)
 572                 priv->cfg->ops->lib->temp_ops.temperature(priv);
 573 }
 574
 575 void iwl_reply_statistics(struct iwl_priv *priv,
 576                               struct iwl_rx_mem_buffer *rxb)
 577 {
 578         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 579
 580         if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
 581 #ifdef CONFIG_IWLWIFI_DEBUGFS
 582                 memset(&priv->_agn.accum_statistics, 0,
 583                         sizeof(struct iwl_notif_statistics));
 584                 memset(&priv->_agn.delta_statistics, 0,
 585                         sizeof(struct iwl_notif_statistics));
 586                 memset(&priv->_agn.max_delta, 0,
 587                         sizeof(struct iwl_notif_statistics));
 588                 memset(&priv->_agn.accum_statistics_bt, 0,
 589                         sizeof(struct iwl_bt_notif_statistics));
 590                 memset(&priv->_agn.delta_statistics_bt, 0,
 591                         sizeof(struct iwl_bt_notif_statistics));
 592                 memset(&priv->_agn.max_delta_bt, 0,
 593                         sizeof(struct iwl_bt_notif_statistics));
 594 #endif
 595                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 596         }
 597         iwl_rx_statistics(priv, rxb);
 598 }
 599
 600 void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
 601                                 struct iwl_rx_mem_buffer *rxb)
 602
 603 {
 604         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 605         struct iwl_missed_beacon_notif *missed_beacon;
 606
 607         missed_beacon = &pkt->u.missed_beacon;
 608         if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
 609             priv->missed_beacon_threshold) {
 610                 IWL_DEBUG_CALIB(priv,
 611                     "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 612                     le32_to_cpu(missed_beacon->consecutive_missed_beacons),
 613                     le32_to_cpu(missed_beacon->total_missed_becons),
 614                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 615                     le32_to_cpu(missed_beacon->num_expected_beacons));
 616                 if (!test_bit(STATUS_SCANNING, &priv->status))
 617                         iwl_init_sensitivity(priv);
 618         }
 619 }
 620
 621 /*
 622  * returns non-zero if packet should be dropped
 623  */
 624 int iwl_set_decrypted_flag(struct iwl_priv *priv,
 625                            struct ieee80211_hdr *hdr,
 626                            u32 decrypt_res,
 627                            struct ieee80211_rx_status *stats)
 628 {
 629         u16 fc = le16_to_cpu(hdr->frame_control);
 630
 631         /*
 632          * All contexts have the same setting here due to it being
 633          * a module parameter, so OK to check any context.
 634          */
 635         if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags &
 636                                                 RXON_FILTER_DIS_DECRYPT_MSK)
 637                 return 0;
 638
 639         if (!(fc & IEEE80211_FCTL_PROTECTED))
 640                 return 0;
 641
 642         IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
 643         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 644         case RX_RES_STATUS_SEC_TYPE_TKIP:
 645                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 646                  * Decryption will be done in SW. */
 647                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 648                     RX_RES_STATUS_BAD_KEY_TTAK)
 649                         break;
 650
 651         case RX_RES_STATUS_SEC_TYPE_WEP:
 652                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 653                     RX_RES_STATUS_BAD_ICV_MIC) {
 654                         /* bad ICV, the packet is destroyed since the
 655                          * decryption is inplace, drop it */
 656                         IWL_DEBUG_RX(priv, "Packet destroyed\n");
 657                         return -1;
 658                 }
 659         case RX_RES_STATUS_SEC_TYPE_CCMP:
 660                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 661                     RX_RES_STATUS_DECRYPT_OK) {
 662                         IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
 663                         stats->flag |= RX_FLAG_DECRYPTED;
 664                 }
 665                 break;
 666
 667         default:
 668                 break;
 669         }
 670         return 0;
 671 }