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 #include "iwl-agn.h"
  42
  43 /******************************************************************************
  44  *
  45  * RX path functions
  46  *
  47  ******************************************************************************/
  48
  49 /*
  50  * Rx theory of operation
  51  *
  52  * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
  53  * each of which point to Receive Buffers to be filled by the NIC.  These get
  54  * used not only for Rx frames, but for any command response or notification
  55  * from the NIC.  The driver and NIC manage the Rx buffers by means
  56  * of indexes into the circular buffer.
  57  *
  58  * Rx Queue Indexes
  59  * The host/firmware share two index registers for managing the Rx buffers.
  60  *
  61  * The READ index maps to the first position that the firmware may be writing
  62  * to -- the driver can read up to (but not including) this position and get
  63  * good data.
  64  * The READ index is managed by the firmware once the card is enabled.
  65  *
  66  * The WRITE index maps to the last position the driver has read from -- the
  67  * position preceding WRITE is the last slot the firmware can place a packet.
  68  *
  69  * The queue is empty (no good data) if WRITE = READ - 1, and is full if
  70  * WRITE = READ.
  71  *
  72  * During initialization, the host sets up the READ queue position to the first
  73  * INDEX position, and WRITE to the last (READ - 1 wrapped)
  74  *
  75  * When the firmware places a packet in a buffer, it will advance the READ index
  76  * and fire the RX interrupt.  The driver can then query the READ index and
  77  * process as many packets as possible, moving the WRITE index forward as it
  78  * resets the Rx queue buffers with new memory.
  79  *
  80  * The management in the driver is as follows:
  81  * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
  82  *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
  83  *   to replenish the iwl->rxq->rx_free.
  84  * + In iwl_rx_replenish (scheduled) if 'processed' != 'read' then the
  85  *   iwl->rxq is replenished and the READ INDEX is updated (updating the
  86  *   'processed' and 'read' driver indexes as well)
  87  * + A received packet is processed and handed to the kernel network stack,
  88  *   detached from the iwl->rxq.  The driver 'processed' index is updated.
  89  * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
  90  *   list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
  91  *   INDEX is not incremented and iwl->status(RX_STALLED) is set.  If there
  92  *   were enough free buffers and RX_STALLED is set it is cleared.
  93  *
  94  *
  95  * Driver sequence:
  96  *
  97  * iwl_rx_queue_alloc()   Allocates rx_free
  98  * iwl_rx_replenish()     Replenishes rx_free list from rx_used, and calls
  99  *                            iwl_rx_queue_restock
 100  * iwl_rx_queue_restock() Moves available buffers from rx_free into Rx
 101  *                            queue, updates firmware pointers, and updates
 102  *                            the WRITE index.  If insufficient rx_free buffers
 103  *                            are available, schedules iwl_rx_replenish
 104  *
 105  * -- enable interrupts --
 106  * ISR - iwl_rx()         Detach iwl_rx_mem_buffers from pool up to the
 107  *                            READ INDEX, detaching the SKB from the pool.
 108  *                            Moves the packet buffer from queue to rx_used.
 109  *                            Calls iwl_rx_queue_restock to refill any empty
 110  *                            slots.
 111  * ...
 112  *
 113  */
 114
 115 /**
 116  * iwl_rx_queue_space - Return number of free slots available in queue.
 117  */
 118 int iwl_rx_queue_space(const struct iwl_rx_queue *q)
 119 {
 120         int s = q->read - q->write;
 121         if (s <= 0)
 122                 s += RX_QUEUE_SIZE;
 123         /* keep some buffer to not confuse full and empty queue */
 124         s -= 2;
 125         if (s < 0)
 126                 s = 0;
 127         return s;
 128 }
 129
 130 /**
 131  * iwl_rx_queue_update_write_ptr - Update the write pointer for the RX queue
 132  */
 133 void iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q)
 134 {
 135         unsigned long flags;
 136         u32 rx_wrt_ptr_reg = priv->hw_params.rx_wrt_ptr_reg;
 137         u32 reg;
 138
 139         spin_lock_irqsave(&q->lock, flags);
 140
 141         if (q->need_update == 0)
 142                 goto exit_unlock;
 143
 144         if (priv->cfg->base_params->shadow_reg_enable) {
 145                 /* shadow register enabled */
 146                 /* Device expects a multiple of 8 */
 147                 q->write_actual = (q->write & ~0x7);
 148                 iwl_write32(priv, rx_wrt_ptr_reg, q->write_actual);
 149         } else {
 150                 /* If power-saving is in use, make sure device is awake */
 151                 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
 152                         reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
 153
 154                         if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
 155                                 IWL_DEBUG_INFO(priv,
 156                                         "Rx queue requesting wakeup,"
 157                                         " GP1 = 0x%x\n", reg);
 158                                 iwl_set_bit(priv, CSR_GP_CNTRL,
 159                                         CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 160                                 goto exit_unlock;
 161                         }
 162
 163                         q->write_actual = (q->write & ~0x7);
 164                         iwl_write_direct32(priv, rx_wrt_ptr_reg,
 165                                         q->write_actual);
 166
 167                 /* Else device is assumed to be awake */
 168                 } else {
 169                         /* Device expects a multiple of 8 */
 170                         q->write_actual = (q->write & ~0x7);
 171                         iwl_write_direct32(priv, rx_wrt_ptr_reg,
 172                                 q->write_actual);
 173                 }
 174         }
 175         q->need_update = 0;
 176
 177  exit_unlock:
 178         spin_unlock_irqrestore(&q->lock, flags);
 179 }
 180
 181 int iwl_rx_queue_alloc(struct iwl_priv *priv)
 182 {
 183         struct iwl_rx_queue *rxq = &priv->rxq;
 184         struct device *dev = &priv->pci_dev->dev;
 185         int i;
 186
 187         spin_lock_init(&rxq->lock);
 188         INIT_LIST_HEAD(&rxq->rx_free);
 189         INIT_LIST_HEAD(&rxq->rx_used);
 190
 191         /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
 192         rxq->bd = dma_alloc_coherent(dev, 4 * RX_QUEUE_SIZE, &rxq->bd_dma,
 193                                      GFP_KERNEL);
 194         if (!rxq->bd)
 195                 goto err_bd;
 196
 197         rxq->rb_stts = dma_alloc_coherent(dev, sizeof(struct iwl_rb_status),
 198                                           &rxq->rb_stts_dma, GFP_KERNEL);
 199         if (!rxq->rb_stts)
 200                 goto err_rb;
 201
 202         /* Fill the rx_used queue with _all_ of the Rx buffers */
 203         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
 204                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 205
 206         /* Set us so that we have processed and used all buffers, but have
 207          * not restocked the Rx queue with fresh buffers */
 208         rxq->read = rxq->write = 0;
 209         rxq->write_actual = 0;
 210         rxq->free_count = 0;
 211         rxq->need_update = 0;
 212         return 0;
 213
 214 err_rb:
 215         dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
 216                           rxq->bd_dma);
 217 err_bd:
 218         return -ENOMEM;
 219 }
 220
 221 /******************************************************************************
 222  *
 223  * Generic RX handler implementations
 224  *
 225  ******************************************************************************/
 226
 227 static void iwl_rx_reply_alive(struct iwl_priv *priv,
 228                                struct iwl_rx_mem_buffer *rxb)
 229 {
 230         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 231         struct iwl_alive_resp *palive;
 232         struct delayed_work *pwork;
 233
 234         palive = &pkt->u.alive_frame;
 235
 236         IWL_DEBUG_INFO(priv, "Alive ucode status 0x%08X revision "
 237                        "0x%01X 0x%01X\n",
 238                        palive->is_valid, palive->ver_type,
 239                        palive->ver_subtype);
 240
 241         if (palive->ver_subtype == INITIALIZE_SUBTYPE) {
 242                 IWL_DEBUG_INFO(priv, "Initialization Alive received.\n");
 243                 memcpy(&priv->card_alive_init,
 244                        &pkt->u.alive_frame,
 245                        sizeof(struct iwl_init_alive_resp));
 246                 pwork = &priv->init_alive_start;
 247         } else {
 248                 IWL_DEBUG_INFO(priv, "Runtime Alive received.\n");
 249                 memcpy(&priv->card_alive, &pkt->u.alive_frame,
 250                        sizeof(struct iwl_alive_resp));
 251                 pwork = &priv->alive_start;
 252         }
 253
 254         /* We delay the ALIVE response by 5ms to
 255          * give the HW RF Kill time to activate... */
 256         if (palive->is_valid == UCODE_VALID_OK)
 257                 queue_delayed_work(priv->workqueue, pwork,
 258                                    msecs_to_jiffies(5));
 259         else {
 260                 IWL_WARN(priv, "%s uCode did not respond OK.\n",
 261                         (palive->ver_subtype == INITIALIZE_SUBTYPE) ?
 262                         "init" : "runtime");
 263                 /*
 264                  * If fail to load init uCode,
 265                  * let's try to load the init uCode again.
 266                  * We should not get into this situation, but if it
 267                  * does happen, we should not move on and loading "runtime"
 268                  * without proper calibrate the device.
 269                  */
 270                 if (palive->ver_subtype == INITIALIZE_SUBTYPE)
 271                         priv->ucode_type = UCODE_NONE;
 272                 queue_work(priv->workqueue, &priv->restart);
 273         }
 274 }
 275
 276 static void iwl_rx_reply_error(struct iwl_priv *priv,
 277                                struct iwl_rx_mem_buffer *rxb)
 278 {
 279         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 280
 281         IWL_ERR(priv, "Error Reply type 0x%08X cmd %s (0x%02X) "
 282                 "seq 0x%04X ser 0x%08X\n",
 283                 le32_to_cpu(pkt->u.err_resp.error_type),
 284                 get_cmd_string(pkt->u.err_resp.cmd_id),
 285                 pkt->u.err_resp.cmd_id,
 286                 le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num),
 287                 le32_to_cpu(pkt->u.err_resp.error_info));
 288 }
 289
 290 static void iwl_rx_csa(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
 291 {
 292         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 293         struct iwl_csa_notification *csa = &(pkt->u.csa_notif);
 294         /*
 295          * MULTI-FIXME
 296          * See iwl_mac_channel_switch.
 297          */
 298         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 299         struct iwl_rxon_cmd *rxon = (void *)&ctx->active;
 300
 301         if (priv->switch_rxon.switch_in_progress) {
 302                 if (!le32_to_cpu(csa->status) &&
 303                     (csa->channel == priv->switch_rxon.channel)) {
 304                         rxon->channel = csa->channel;
 305                         ctx->staging.channel = csa->channel;
 306                         IWL_DEBUG_11H(priv, "CSA notif: channel %d\n",
 307                               le16_to_cpu(csa->channel));
 308                         iwl_chswitch_done(priv, true);
 309                 } else {
 310                         IWL_ERR(priv, "CSA notif (fail) : channel %d\n",
 311                               le16_to_cpu(csa->channel));
 312                         iwl_chswitch_done(priv, false);
 313                 }
 314         }
 315 }
 316
 317
 318 static void iwl_rx_spectrum_measure_notif(struct iwl_priv *priv,
 319                                           struct iwl_rx_mem_buffer *rxb)
 320 {
 321         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 322         struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif);
 323
 324         if (!report->state) {
 325                 IWL_DEBUG_11H(priv,
 326                         "Spectrum Measure Notification: Start\n");
 327                 return;
 328         }
 329
 330         memcpy(&priv->measure_report, report, sizeof(*report));
 331         priv->measurement_status |= MEASUREMENT_READY;
 332 }
 333
 334 static void iwl_rx_pm_sleep_notif(struct iwl_priv *priv,
 335                                   struct iwl_rx_mem_buffer *rxb)
 336 {
 337 #ifdef CONFIG_IWLWIFI_DEBUG
 338         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 339         struct iwl_sleep_notification *sleep = &(pkt->u.sleep_notif);
 340         IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n",
 341                      sleep->pm_sleep_mode, sleep->pm_wakeup_src);
 342 #endif
 343 }
 344
 345 static void iwl_rx_pm_debug_statistics_notif(struct iwl_priv *priv,
 346                                              struct iwl_rx_mem_buffer *rxb)
 347 {
 348         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 349         u32 len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
 350         IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled "
 351                         "notification for %s:\n", len,
 352                         get_cmd_string(pkt->hdr.cmd));
 353         iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->u.raw, len);
 354 }
 355
 356 static void iwl_rx_beacon_notif(struct iwl_priv *priv,
 357                                 struct iwl_rx_mem_buffer *rxb)
 358 {
 359         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 360         struct iwlagn_beacon_notif *beacon = (void *)pkt->u.raw;
 361 #ifdef CONFIG_IWLWIFI_DEBUG
 362         u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status);
 363         u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);
 364
 365         IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d "
 366                 "tsf:0x%.8x%.8x rate:%d\n",
 367                 status & TX_STATUS_MSK,
 368                 beacon->beacon_notify_hdr.failure_frame,
 369                 le32_to_cpu(beacon->ibss_mgr_status),
 370                 le32_to_cpu(beacon->high_tsf),
 371                 le32_to_cpu(beacon->low_tsf), rate);
 372 #endif
 373
 374         priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);
 375
 376         if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
 377                 queue_work(priv->workqueue, &priv->beacon_update);
 378 }
 379
 380 /* the threshold ratio of actual_ack_cnt to expected_ack_cnt in percent */
 381 #define ACK_CNT_RATIO (50)
 382 #define BA_TIMEOUT_CNT (5)
 383 #define BA_TIMEOUT_MAX (16)
 384
 385 /**
 386  * iwl_good_ack_health - checks for ACK count ratios, BA timeout retries.
 387  *
 388  * When the ACK count ratio is low and aggregated BA timeout retries exceeding
 389  * the BA_TIMEOUT_MAX, reload firmware and bring system back to normal
 390  * operation state.
 391  */
 392 static bool iwl_good_ack_health(struct iwl_priv *priv, struct iwl_rx_packet *pkt)
 393 {
 394         int actual_delta, expected_delta, ba_timeout_delta;
 395         struct statistics_tx *cur, *old;
 396
 397         if (priv->_agn.agg_tids_count)
 398                 return true;
 399
 400         if (iwl_bt_statistics(priv)) {
 401                 cur = &pkt->u.stats_bt.tx;
 402                 old = &priv->_agn.statistics_bt.tx;
 403         } else {
 404                 cur = &pkt->u.stats.tx;
 405                 old = &priv->_agn.statistics.tx;
 406         }
 407
 408         actual_delta = le32_to_cpu(cur->actual_ack_cnt) -
 409                        le32_to_cpu(old->actual_ack_cnt);
 410         expected_delta = le32_to_cpu(cur->expected_ack_cnt) -
 411                          le32_to_cpu(old->expected_ack_cnt);
 412
 413         /* Values should not be negative, but we do not trust the firmware */
 414         if (actual_delta <= 0 || expected_delta <= 0)
 415                 return true;
 416
 417         ba_timeout_delta = le32_to_cpu(cur->agg.ba_timeout) -
 418                            le32_to_cpu(old->agg.ba_timeout);
 419
 420         if ((actual_delta * 100 / expected_delta) < ACK_CNT_RATIO &&
 421             ba_timeout_delta > BA_TIMEOUT_CNT) {
 422                 IWL_DEBUG_RADIO(priv, "deltas: actual %d expected %d ba_timeout %d\n",
 423                                 actual_delta, expected_delta, ba_timeout_delta);
 424
 425 #ifdef CONFIG_IWLWIFI_DEBUGFS
 426                 /*
 427                  * This is ifdef'ed on DEBUGFS because otherwise the
 428                  * statistics aren't available. If DEBUGFS is set but
 429                  * DEBUG is not, these will just compile out.
 430                  */
 431                 IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta %d\n",
 432                                 priv->_agn.delta_statistics.tx.rx_detected_cnt);
 433                 IWL_DEBUG_RADIO(priv,
 434                                 "ack_or_ba_timeout_collision delta %d\n",
 435                                 priv->_agn.delta_statistics.tx.ack_or_ba_timeout_collision);
 436 #endif
 437
 438                 if (ba_timeout_delta >= BA_TIMEOUT_MAX)
 439                         return false;
 440         }
 441
 442         return true;
 443 }
 444
 445 /**
 446  * iwl_good_plcp_health - checks for plcp error.
 447  *
 448  * When the plcp error is exceeding the thresholds, reset the radio
 449  * to improve the throughput.
 450  */
 451 static bool iwl_good_plcp_health(struct iwl_priv *priv,
 452                                  struct iwl_rx_packet *pkt, unsigned int msecs)
 453 {
 454         int delta;
 455         int threshold = priv->cfg->base_params->plcp_delta_threshold;
 456
 457         if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
 458                 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
 459                 return true;
 460         }
 461
 462         if (iwl_bt_statistics(priv)) {
 463                 struct statistics_rx_bt *cur, *old;
 464
 465                 cur = &pkt->u.stats_bt.rx;
 466                 old = &priv->_agn.statistics_bt.rx;
 467
 468                 delta = le32_to_cpu(cur->ofdm.plcp_err) -
 469                         le32_to_cpu(old->ofdm.plcp_err) +
 470                         le32_to_cpu(cur->ofdm_ht.plcp_err) -
 471                         le32_to_cpu(old->ofdm_ht.plcp_err);
 472         } else {
 473                 struct statistics_rx *cur, *old;
 474
 475                 cur = &pkt->u.stats.rx;
 476                 old = &priv->_agn.statistics.rx;
 477
 478                 delta = le32_to_cpu(cur->ofdm.plcp_err) -
 479                         le32_to_cpu(old->ofdm.plcp_err) +
 480                         le32_to_cpu(cur->ofdm_ht.plcp_err) -
 481                         le32_to_cpu(old->ofdm_ht.plcp_err);
 482         }
 483
 484         /* Can be negative if firmware reseted statistics */
 485         if (delta <= 0)
 486                 return true;
 487
 488         if ((delta * 100 / msecs) > threshold) {
 489                 IWL_DEBUG_RADIO(priv,
 490                                 "plcp health threshold %u delta %d msecs %u\n",
 491                                 threshold, delta, msecs);
 492                 return false;
 493         }
 494
 495         return true;
 496 }
 497
 498 static void iwl_recover_from_statistics(struct iwl_priv *priv,
 499                                         struct iwl_rx_packet *pkt)
 500 {
 501         const struct iwl_mod_params *mod_params = priv->cfg->mod_params;
 502         unsigned int msecs;
 503         unsigned long stamp;
 504
 505         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 506                 return;
 507
 508         stamp = jiffies;
 509         msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies);
 510
 511         /* Only gather statistics and update time stamp when not associated */
 512         if (!iwl_is_any_associated(priv))
 513                 goto out;
 514
 515         /* Do not check/recover when do not have enough statistics data */
 516         if (msecs < 99)
 517                 return;
 518
 519         if (mod_params->ack_check && !iwl_good_ack_health(priv, pkt)) {
 520                 IWL_ERR(priv, "low ack count detected, restart firmware\n");
 521                 if (!iwl_force_reset(priv, IWL_FW_RESET, false))
 522                         return;
 523         }
 524
 525         if (mod_params->plcp_check && !iwl_good_plcp_health(priv, pkt, msecs))
 526                 iwl_force_reset(priv, IWL_RF_RESET, false);
 527
 528 out:
 529         if (iwl_bt_statistics(priv))
 530                 memcpy(&priv->_agn.statistics_bt, &pkt->u.stats_bt,
 531                         sizeof(priv->_agn.statistics_bt));
 532         else
 533                 memcpy(&priv->_agn.statistics, &pkt->u.stats,
 534                         sizeof(priv->_agn.statistics));
 535
 536         priv->rx_statistics_jiffies = stamp;
 537 }
 538
 539 /* Calculate noise level, based on measurements during network silence just
 540  *   before arriving beacon.  This measurement can be done only if we know
 541  *   exactly when to expect beacons, therefore only when we're associated. */
 542 static void iwl_rx_calc_noise(struct iwl_priv *priv)
 543 {
 544         struct statistics_rx_non_phy *rx_info;
 545         int num_active_rx = 0;
 546         int total_silence = 0;
 547         int bcn_silence_a, bcn_silence_b, bcn_silence_c;
 548         int last_rx_noise;
 549
 550         if (iwl_bt_statistics(priv))
 551                 rx_info = &(priv->_agn.statistics_bt.rx.general.common);
 552         else
 553                 rx_info = &(priv->_agn.statistics.rx.general);
 554         bcn_silence_a =
 555                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 556         bcn_silence_b =
 557                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 558         bcn_silence_c =
 559                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 560
 561         if (bcn_silence_a) {
 562                 total_silence += bcn_silence_a;
 563                 num_active_rx++;
 564         }
 565         if (bcn_silence_b) {
 566                 total_silence += bcn_silence_b;
 567                 num_active_rx++;
 568         }
 569         if (bcn_silence_c) {
 570                 total_silence += bcn_silence_c;
 571                 num_active_rx++;
 572         }
 573
 574         /* Average among active antennas */
 575         if (num_active_rx)
 576                 last_rx_noise = (total_silence / num_active_rx) - 107;
 577         else
 578                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 579
 580         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 581                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 582                         last_rx_noise);
 583 }
 584
 585 /*
 586  *  based on the assumption of all statistics counter are in DWORD
 587  *  FIXME: This function is for debugging, do not deal with
 588  *  the case of counters roll-over.
 589  */
 590 static void iwl_accumulative_statistics(struct iwl_priv *priv,
 591                                         __le32 *stats)
 592 {
 593 #ifdef CONFIG_IWLWIFI_DEBUGFS
 594         int i, size;
 595         __le32 *prev_stats;
 596         u32 *accum_stats;
 597         u32 *delta, *max_delta;
 598         struct statistics_general_common *general, *accum_general;
 599         struct statistics_tx *tx, *accum_tx;
 600
 601         if (iwl_bt_statistics(priv)) {
 602                 prev_stats = (__le32 *)&priv->_agn.statistics_bt;
 603                 accum_stats = (u32 *)&priv->_agn.accum_statistics_bt;
 604                 size = sizeof(struct iwl_bt_notif_statistics);
 605                 general = &priv->_agn.statistics_bt.general.common;
 606                 accum_general = &priv->_agn.accum_statistics_bt.general.common;
 607                 tx = &priv->_agn.statistics_bt.tx;
 608                 accum_tx = &priv->_agn.accum_statistics_bt.tx;
 609                 delta = (u32 *)&priv->_agn.delta_statistics_bt;
 610                 max_delta = (u32 *)&priv->_agn.max_delta_bt;
 611         } else {
 612                 prev_stats = (__le32 *)&priv->_agn.statistics;
 613                 accum_stats = (u32 *)&priv->_agn.accum_statistics;
 614                 size = sizeof(struct iwl_notif_statistics);
 615                 general = &priv->_agn.statistics.general.common;
 616                 accum_general = &priv->_agn.accum_statistics.general.common;
 617                 tx = &priv->_agn.statistics.tx;
 618                 accum_tx = &priv->_agn.accum_statistics.tx;
 619                 delta = (u32 *)&priv->_agn.delta_statistics;
 620                 max_delta = (u32 *)&priv->_agn.max_delta;
 621         }
 622         for (i = sizeof(__le32); i < size;
 623              i += sizeof(__le32), stats++, prev_stats++, delta++,
 624              max_delta++, accum_stats++) {
 625                 if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
 626                         *delta = (le32_to_cpu(*stats) -
 627                                 le32_to_cpu(*prev_stats));
 628                         *accum_stats += *delta;
 629                         if (*delta > *max_delta)
 630                                 *max_delta = *delta;
 631                 }
 632         }
 633
 634         /* reset accumulative statistics for "no-counter" type statistics */
 635         accum_general->temperature = general->temperature;
 636         accum_general->temperature_m = general->temperature_m;
 637         accum_general->ttl_timestamp = general->ttl_timestamp;
 638         accum_tx->tx_power.ant_a = tx->tx_power.ant_a;
 639         accum_tx->tx_power.ant_b = tx->tx_power.ant_b;
 640         accum_tx->tx_power.ant_c = tx->tx_power.ant_c;
 641 #endif
 642 }
 643
 644 static void iwl_rx_statistics(struct iwl_priv *priv,
 645                               struct iwl_rx_mem_buffer *rxb)
 646 {
 647         const int reg_recalib_period = 60;
 648         int change;
 649         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 650
 651         if (iwl_bt_statistics(priv)) {
 652                 IWL_DEBUG_RX(priv,
 653                              "Statistics notification received (%d vs %d).\n",
 654                              (int)sizeof(struct iwl_bt_notif_statistics),
 655                              le32_to_cpu(pkt->len_n_flags) &
 656                              FH_RSCSR_FRAME_SIZE_MSK);
 657
 658                 change = ((priv->_agn.statistics_bt.general.common.temperature !=
 659                            pkt->u.stats_bt.general.common.temperature) ||
 660                            ((priv->_agn.statistics_bt.flag &
 661                            STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 662                            (pkt->u.stats_bt.flag &
 663                            STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 664
 665                 iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats_bt);
 666         } else {
 667                 IWL_DEBUG_RX(priv,
 668                              "Statistics notification received (%d vs %d).\n",
 669                              (int)sizeof(struct iwl_notif_statistics),
 670                              le32_to_cpu(pkt->len_n_flags) &
 671                              FH_RSCSR_FRAME_SIZE_MSK);
 672
 673                 change = ((priv->_agn.statistics.general.common.temperature !=
 674                            pkt->u.stats.general.common.temperature) ||
 675                            ((priv->_agn.statistics.flag &
 676                            STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 677                            (pkt->u.stats.flag &
 678                            STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 679
 680                 iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
 681         }
 682
 683         iwl_recover_from_statistics(priv, pkt);
 684
 685         set_bit(STATUS_STATISTICS, &priv->status);
 686
 687         /* Reschedule the statistics timer to occur in
 688          * reg_recalib_period seconds to ensure we get a
 689          * thermal update even if the uCode doesn't give
 690          * us one */
 691         mod_timer(&priv->statistics_periodic, jiffies +
 692                   msecs_to_jiffies(reg_recalib_period * 1000));
 693
 694         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 695             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 696                 iwl_rx_calc_noise(priv);
 697                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 698         }
 699         if (priv->cfg->ops->lib->temp_ops.temperature && change)
 700                 priv->cfg->ops->lib->temp_ops.temperature(priv);
 701 }
 702
 703 static void iwl_rx_reply_statistics(struct iwl_priv *priv,
 704                                     struct iwl_rx_mem_buffer *rxb)
 705 {
 706         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 707
 708         if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
 709 #ifdef CONFIG_IWLWIFI_DEBUGFS
 710                 memset(&priv->_agn.accum_statistics, 0,
 711                         sizeof(struct iwl_notif_statistics));
 712                 memset(&priv->_agn.delta_statistics, 0,
 713                         sizeof(struct iwl_notif_statistics));
 714                 memset(&priv->_agn.max_delta, 0,
 715                         sizeof(struct iwl_notif_statistics));
 716                 memset(&priv->_agn.accum_statistics_bt, 0,
 717                         sizeof(struct iwl_bt_notif_statistics));
 718                 memset(&priv->_agn.delta_statistics_bt, 0,
 719                         sizeof(struct iwl_bt_notif_statistics));
 720                 memset(&priv->_agn.max_delta_bt, 0,
 721                         sizeof(struct iwl_bt_notif_statistics));
 722 #endif
 723                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 724         }
 725         iwl_rx_statistics(priv, rxb);
 726 }
 727
 728 /* Handle notification from uCode that card's power state is changing
 729  * due to software, hardware, or critical temperature RFKILL */
 730 static void iwl_rx_card_state_notif(struct iwl_priv *priv,
 731                                     struct iwl_rx_mem_buffer *rxb)
 732 {
 733         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 734         u32 flags = le32_to_cpu(pkt->u.card_state_notif.flags);
 735         unsigned long status = priv->status;
 736
 737         IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
 738                           (flags & HW_CARD_DISABLED) ? "Kill" : "On",
 739                           (flags & SW_CARD_DISABLED) ? "Kill" : "On",
 740                           (flags & CT_CARD_DISABLED) ?
 741                           "Reached" : "Not reached");
 742
 743         if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
 744                      CT_CARD_DISABLED)) {
 745
 746                 iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
 747                             CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 748
 749                 iwl_write_direct32(priv, HBUS_TARG_MBX_C,
 750                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 751
 752                 if (!(flags & RXON_CARD_DISABLED)) {
 753                         iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
 754                                     CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
 755                         iwl_write_direct32(priv, HBUS_TARG_MBX_C,
 756                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
 757                 }
 758                 if (flags & CT_CARD_DISABLED)
 759                         iwl_tt_enter_ct_kill(priv);
 760         }
 761         if (!(flags & CT_CARD_DISABLED))
 762                 iwl_tt_exit_ct_kill(priv);
 763
 764         if (flags & HW_CARD_DISABLED)
 765                 set_bit(STATUS_RF_KILL_HW, &priv->status);
 766         else
 767                 clear_bit(STATUS_RF_KILL_HW, &priv->status);
 768
 769
 770         if (!(flags & RXON_CARD_DISABLED))
 771                 iwl_scan_cancel(priv);
 772
 773         if ((test_bit(STATUS_RF_KILL_HW, &status) !=
 774              test_bit(STATUS_RF_KILL_HW, &priv->status)))
 775                 wiphy_rfkill_set_hw_state(priv->hw->wiphy,
 776                         test_bit(STATUS_RF_KILL_HW, &priv->status));
 777         else
 778                 wake_up_interruptible(&priv->wait_command_queue);
 779 }
 780
 781 static void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
 782                                        struct iwl_rx_mem_buffer *rxb)
 783
 784 {
 785         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 786         struct iwl_missed_beacon_notif *missed_beacon;
 787
 788         missed_beacon = &pkt->u.missed_beacon;
 789         if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
 790             priv->missed_beacon_threshold) {
 791                 IWL_DEBUG_CALIB(priv,
 792                     "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 793                     le32_to_cpu(missed_beacon->consecutive_missed_beacons),
 794                     le32_to_cpu(missed_beacon->total_missed_becons),
 795                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 796                     le32_to_cpu(missed_beacon->num_expected_beacons));
 797                 if (!test_bit(STATUS_SCANNING, &priv->status))
 798                         iwl_init_sensitivity(priv);
 799         }
 800 }
 801
 802 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
 803  * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
 804 static void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
 805                                 struct iwl_rx_mem_buffer *rxb)
 806 {
 807         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 808
 809         priv->_agn.last_phy_res_valid = true;
 810         memcpy(&priv->_agn.last_phy_res, pkt->u.raw,
 811                sizeof(struct iwl_rx_phy_res));
 812 }
 813
 814 /*
 815  * returns non-zero if packet should be dropped
 816  */
 817 static int iwl_set_decrypted_flag(struct iwl_priv *priv,
 818                                   struct ieee80211_hdr *hdr,
 819                                   u32 decrypt_res,
 820                                   struct ieee80211_rx_status *stats)
 821 {
 822         u16 fc = le16_to_cpu(hdr->frame_control);
 823
 824         /*
 825          * All contexts have the same setting here due to it being
 826          * a module parameter, so OK to check any context.
 827          */
 828         if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags &
 829                                                 RXON_FILTER_DIS_DECRYPT_MSK)
 830                 return 0;
 831
 832         if (!(fc & IEEE80211_FCTL_PROTECTED))
 833                 return 0;
 834
 835         IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
 836         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 837         case RX_RES_STATUS_SEC_TYPE_TKIP:
 838                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 839                  * Decryption will be done in SW. */
 840                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 841                     RX_RES_STATUS_BAD_KEY_TTAK)
 842                         break;
 843
 844         case RX_RES_STATUS_SEC_TYPE_WEP:
 845                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 846                     RX_RES_STATUS_BAD_ICV_MIC) {
 847                         /* bad ICV, the packet is destroyed since the
 848                          * decryption is inplace, drop it */
 849                         IWL_DEBUG_RX(priv, "Packet destroyed\n");
 850                         return -1;
 851                 }
 852         case RX_RES_STATUS_SEC_TYPE_CCMP:
 853                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 854                     RX_RES_STATUS_DECRYPT_OK) {
 855                         IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
 856                         stats->flag |= RX_FLAG_DECRYPTED;
 857                 }
 858                 break;
 859
 860         default:
 861                 break;
 862         }
 863         return 0;
 864 }
 865
 866 static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 867                                         struct ieee80211_hdr *hdr,
 868                                         u16 len,
 869                                         u32 ampdu_status,
 870                                         struct iwl_rx_mem_buffer *rxb,
 871                                         struct ieee80211_rx_status *stats)
 872 {
 873         struct sk_buff *skb;
 874         __le16 fc = hdr->frame_control;
 875
 876         /* We only process data packets if the interface is open */
 877         if (unlikely(!priv->is_open)) {
 878                 IWL_DEBUG_DROP_LIMIT(priv,
 879                     "Dropping packet while interface is not open.\n");
 880                 return;
 881         }
 882
 883         /* In case of HW accelerated crypto and bad decryption, drop */
 884         if (!priv->cfg->mod_params->sw_crypto &&
 885             iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
 886                 return;
 887
 888         skb = dev_alloc_skb(128);
 889         if (!skb) {
 890                 IWL_ERR(priv, "dev_alloc_skb failed\n");
 891                 return;
 892         }
 893
 894         skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
 895
 896         iwl_update_stats(priv, false, fc, len);
 897         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
 898
 899         ieee80211_rx(priv->hw, skb);
 900         priv->alloc_rxb_page--;
 901         rxb->page = NULL;
 902 }
 903
 904 static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
 905 {
 906         u32 decrypt_out = 0;
 907
 908         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
 909                                         RX_RES_STATUS_STATION_FOUND)
 910                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
 911                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
 912
 913         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
 914
 915         /* packet was not encrypted */
 916         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 917                                         RX_RES_STATUS_SEC_TYPE_NONE)
 918                 return decrypt_out;
 919
 920         /* packet was encrypted with unknown alg */
 921         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 922                                         RX_RES_STATUS_SEC_TYPE_ERR)
 923                 return decrypt_out;
 924
 925         /* decryption was not done in HW */
 926         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
 927                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
 928                 return decrypt_out;
 929
 930         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
 931
 932         case RX_RES_STATUS_SEC_TYPE_CCMP:
 933                 /* alg is CCM: check MIC only */
 934                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
 935                         /* Bad MIC */
 936                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 937                 else
 938                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 939
 940                 break;
 941
 942         case RX_RES_STATUS_SEC_TYPE_TKIP:
 943                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
 944                         /* Bad TTAK */
 945                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
 946                         break;
 947                 }
 948                 /* fall through if TTAK OK */
 949         default:
 950                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
 951                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 952                 else
 953                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 954                 break;
 955         }
 956
 957         IWL_DEBUG_RX(priv, "decrypt_in:0x%x  decrypt_out = 0x%x\n",
 958                                         decrypt_in, decrypt_out);
 959
 960         return decrypt_out;
 961 }
 962
 963 /* Called for REPLY_RX (legacy ABG frames), or
 964  * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
 965 static void iwl_rx_reply_rx(struct iwl_priv *priv,
 966                             struct iwl_rx_mem_buffer *rxb)
 967 {
 968         struct ieee80211_hdr *header;
 969         struct ieee80211_rx_status rx_status;
 970         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 971         struct iwl_rx_phy_res *phy_res;
 972         __le32 rx_pkt_status;
 973         struct iwl_rx_mpdu_res_start *amsdu;
 974         u32 len;
 975         u32 ampdu_status;
 976         u32 rate_n_flags;
 977
 978         /**
 979          * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
 980          *      REPLY_RX: physical layer info is in this buffer
 981          *      REPLY_RX_MPDU_CMD: physical layer info was sent in separate
 982          *              command and cached in priv->last_phy_res
 983          *
 984          * Here we set up local variables depending on which command is
 985          * received.
 986          */
 987         if (pkt->hdr.cmd == REPLY_RX) {
 988                 phy_res = (struct iwl_rx_phy_res *)pkt->u.raw;
 989                 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res)
 990                                 + phy_res->cfg_phy_cnt);
 991
 992                 len = le16_to_cpu(phy_res->byte_count);
 993                 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) +
 994                                 phy_res->cfg_phy_cnt + len);
 995                 ampdu_status = le32_to_cpu(rx_pkt_status);
 996         } else {
 997                 if (!priv->_agn.last_phy_res_valid) {
 998                         IWL_ERR(priv, "MPDU frame without cached PHY data\n");
 999                         return;
1000                 }
1001                 phy_res = &priv->_agn.last_phy_res;
1002                 amsdu = (struct iwl_rx_mpdu_res_start *)pkt->u.raw;
1003                 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu));
1004                 len = le16_to_cpu(amsdu->byte_count);
1005                 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len);
1006                 ampdu_status = iwl_translate_rx_status(priv,
1007                                                 le32_to_cpu(rx_pkt_status));
1008         }
1009
1010         if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
1011                 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n",
1012                                 phy_res->cfg_phy_cnt);
1013                 return;
1014         }
1015
1016         if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
1017             !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
1018                 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
1019                                 le32_to_cpu(rx_pkt_status));
1020                 return;
1021         }
1022
1023         /* This will be used in several places later */
1024         rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
1025
1026         /* rx_status carries information about the packet to mac80211 */
1027         rx_status.mactime = le64_to_cpu(phy_res->timestamp);
1028         rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
1029                                 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
1030         rx_status.freq =
1031                 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel),
1032                                                rx_status.band);
1033         rx_status.rate_idx =
1034                 iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
1035         rx_status.flag = 0;
1036
1037         /* TSF isn't reliable. In order to allow smooth user experience,
1038          * this W/A doesn't propagate it to the mac80211 */
1039         /*rx_status.flag |= RX_FLAG_MACTIME_MPDU;*/
1040
1041         priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
1042
1043         /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1044         rx_status.signal = priv->cfg->ops->utils->calc_rssi(priv, phy_res);
1045
1046         iwl_dbg_log_rx_data_frame(priv, len, header);
1047         IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n",
1048                 rx_status.signal, (unsigned long long)rx_status.mactime);
1049
1050         /*
1051          * "antenna number"
1052          *
1053          * It seems that the antenna field in the phy flags value
1054          * is actually a bit field. This is undefined by radiotap,
1055          * it wants an actual antenna number but I always get "7"
1056          * for most legacy frames I receive indicating that the
1057          * same frame was received on all three RX chains.
1058          *
1059          * I think this field should be removed in favor of a
1060          * new 802.11n radiotap field "RX chains" that is defined
1061          * as a bitmask.
1062          */
1063         rx_status.antenna =
1064                 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
1065                 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
1066
1067         /* set the preamble flag if appropriate */
1068         if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
1069                 rx_status.flag |= RX_FLAG_SHORTPRE;
1070
1071         /* Set up the HT phy flags */
1072         if (rate_n_flags & RATE_MCS_HT_MSK)
1073                 rx_status.flag |= RX_FLAG_HT;
1074         if (rate_n_flags & RATE_MCS_HT40_MSK)
1075                 rx_status.flag |= RX_FLAG_40MHZ;
1076         if (rate_n_flags & RATE_MCS_SGI_MSK)
1077                 rx_status.flag |= RX_FLAG_SHORT_GI;
1078
1079         iwl_pass_packet_to_mac80211(priv, header, len, ampdu_status,
1080                                     rxb, &rx_status);
1081 }
1082
1083 /**
1084  * iwl_setup_rx_handlers - Initialize Rx handler callbacks
1085  *
1086  * Setup the RX handlers for each of the reply types sent from the uCode
1087  * to the host.
1088  */
1089 void iwl_setup_rx_handlers(struct iwl_priv *priv)
1090 {
1091         void (**handlers)(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb);
1092
1093         handlers = priv->rx_handlers;
1094
1095         handlers[REPLY_ALIVE]                   = iwl_rx_reply_alive;
1096         handlers[REPLY_ERROR]                   = iwl_rx_reply_error;
1097         handlers[CHANNEL_SWITCH_NOTIFICATION]   = iwl_rx_csa;
1098         handlers[SPECTRUM_MEASURE_NOTIFICATION] = iwl_rx_spectrum_measure_notif;
1099         handlers[PM_SLEEP_NOTIFICATION]         = iwl_rx_pm_sleep_notif;
1100         handlers[PM_DEBUG_STATISTIC_NOTIFIC]    = iwl_rx_pm_debug_statistics_notif;
1101         handlers[BEACON_NOTIFICATION]           = iwl_rx_beacon_notif;
1102
1103         /*
1104          * The same handler is used for both the REPLY to a discrete
1105          * statistics request from the host as well as for the periodic
1106          * statistics notifications (after received beacons) from the uCode.
1107          */
1108         handlers[REPLY_STATISTICS_CMD]          = iwl_rx_reply_statistics;
1109         handlers[STATISTICS_NOTIFICATION]       = iwl_rx_statistics;
1110
1111         iwl_setup_rx_scan_handlers(priv);
1112
1113         handlers[CARD_STATE_NOTIFICATION]       = iwl_rx_card_state_notif;
1114         handlers[MISSED_BEACONS_NOTIFICATION]   = iwl_rx_missed_beacon_notif;
1115
1116         /* Rx handlers */
1117         handlers[REPLY_RX_PHY_CMD]              = iwl_rx_reply_rx_phy;
1118         handlers[REPLY_RX_MPDU_CMD]             = iwl_rx_reply_rx;
1119
1120         /* block ack */
1121         handlers[REPLY_COMPRESSED_BA]           = iwlagn_rx_reply_compressed_ba;
1122
1123         /* Set up hardware specific Rx handlers */
1124         priv->cfg->ops->lib->rx_handler_setup(priv);
1125 }