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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2009 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 <net/mac80211.h>
  32 #include <asm/unaligned.h>
  33 #include "iwl-eeprom.h"
  34 #include "iwl-dev.h"
  35 #include "iwl-core.h"
  36 #include "iwl-sta.h"
  37 #include "iwl-io.h"
  38 #include "iwl-calib.h"
  39 #include "iwl-helpers.h"
  40 /************************** RX-FUNCTIONS ****************************/
  41 /*
  42  * Rx theory of operation
  43  *
  44  * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
  45  * each of which point to Receive Buffers to be filled by the NIC.  These get
  46  * used not only for Rx frames, but for any command response or notification
  47  * from the NIC.  The driver and NIC manage the Rx buffers by means
  48  * of indexes into the circular buffer.
  49  *
  50  * Rx Queue Indexes
  51  * The host/firmware share two index registers for managing the Rx buffers.
  52  *
  53  * The READ index maps to the first position that the firmware may be writing
  54  * to -- the driver can read up to (but not including) this position and get
  55  * good data.
  56  * The READ index is managed by the firmware once the card is enabled.
  57  *
  58  * The WRITE index maps to the last position the driver has read from -- the
  59  * position preceding WRITE is the last slot the firmware can place a packet.
  60  *
  61  * The queue is empty (no good data) if WRITE = READ - 1, and is full if
  62  * WRITE = READ.
  63  *
  64  * During initialization, the host sets up the READ queue position to the first
  65  * INDEX position, and WRITE to the last (READ - 1 wrapped)
  66  *
  67  * When the firmware places a packet in a buffer, it will advance the READ index
  68  * and fire the RX interrupt.  The driver can then query the READ index and
  69  * process as many packets as possible, moving the WRITE index forward as it
  70  * resets the Rx queue buffers with new memory.
  71  *
  72  * The management in the driver is as follows:
  73  * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
  74  *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
  75  *   to replenish the iwl->rxq->rx_free.
  76  * + In iwl_rx_replenish (scheduled) if 'processed' != 'read' then the
  77  *   iwl->rxq is replenished and the READ INDEX is updated (updating the
  78  *   'processed' and 'read' driver indexes as well)
  79  * + A received packet is processed and handed to the kernel network stack,
  80  *   detached from the iwl->rxq.  The driver 'processed' index is updated.
  81  * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
  82  *   list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
  83  *   INDEX is not incremented and iwl->status(RX_STALLED) is set.  If there
  84  *   were enough free buffers and RX_STALLED is set it is cleared.
  85  *
  86  *
  87  * Driver sequence:
  88  *
  89  * iwl_rx_queue_alloc()   Allocates rx_free
  90  * iwl_rx_replenish()     Replenishes rx_free list from rx_used, and calls
  91  *                            iwl_rx_queue_restock
  92  * iwl_rx_queue_restock() Moves available buffers from rx_free into Rx
  93  *                            queue, updates firmware pointers, and updates
  94  *                            the WRITE index.  If insufficient rx_free buffers
  95  *                            are available, schedules iwl_rx_replenish
  96  *
  97  * -- enable interrupts --
  98  * ISR - iwl_rx()         Detach iwl_rx_mem_buffers from pool up to the
  99  *                            READ INDEX, detaching the SKB from the pool.
 100  *                            Moves the packet buffer from queue to rx_used.
 101  *                            Calls iwl_rx_queue_restock to refill any empty
 102  *                            slots.
 103  * ...
 104  *
 105  */
 106
 107 /**
 108  * iwl_rx_queue_space - Return number of free slots available in queue.
 109  */
 110 int iwl_rx_queue_space(const struct iwl_rx_queue *q)
 111 {
 112         int s = q->read - q->write;
 113         if (s <= 0)
 114                 s += RX_QUEUE_SIZE;
 115         /* keep some buffer to not confuse full and empty queue */
 116         s -= 2;
 117         if (s < 0)
 118                 s = 0;
 119         return s;
 120 }
 121 EXPORT_SYMBOL(iwl_rx_queue_space);
 122
 123 /**
 124  * iwl_rx_queue_update_write_ptr - Update the write pointer for the RX queue
 125  */
 126 int 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         int ret = 0;
 132
 133         spin_lock_irqsave(&q->lock, flags);
 134
 135         if (q->need_update == 0)
 136                 goto exit_unlock;
 137
 138         /* If power-saving is in use, make sure device is awake */
 139         if (test_bit(STATUS_POWER_PMI, &priv->status)) {
 140                 reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
 141
 142                 if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
 143                         iwl_set_bit(priv, CSR_GP_CNTRL,
 144                                     CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 145                         goto exit_unlock;
 146                 }
 147
 148                 ret = iwl_grab_nic_access(priv);
 149                 if (ret)
 150                         goto exit_unlock;
 151
 152                 /* Device expects a multiple of 8 */
 153                 iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write & ~0x7);
 154                 iwl_release_nic_access(priv);
 155
 156         /* Else device is assumed to be awake */
 157         } else {
 158                 /* Device expects a multiple of 8 */
 159                 iwl_write32(priv, rx_wrt_ptr_reg, q->write & ~0x7);
 160         }
 161
 162         q->need_update = 0;
 163
 164  exit_unlock:
 165         spin_unlock_irqrestore(&q->lock, flags);
 166         return ret;
 167 }
 168 EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr);
 169 /**
 170  * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
 171  */
 172 static inline __le32 iwl_dma_addr2rbd_ptr(struct iwl_priv *priv,
 173                                           dma_addr_t dma_addr)
 174 {
 175         return cpu_to_le32((u32)(dma_addr >> 8));
 176 }
 177
 178 /**
 179  * iwl_rx_queue_restock - refill RX queue from pre-allocated pool
 180  *
 181  * If there are slots in the RX queue that need to be restocked,
 182  * and we have free pre-allocated buffers, fill the ranks as much
 183  * as we can, pulling from rx_free.
 184  *
 185  * This moves the 'write' index forward to catch up with 'processed', and
 186  * also updates the memory address in the firmware to reference the new
 187  * target buffer.
 188  */
 189 int iwl_rx_queue_restock(struct iwl_priv *priv)
 190 {
 191         struct iwl_rx_queue *rxq = &priv->rxq;
 192         struct list_head *element;
 193         struct iwl_rx_mem_buffer *rxb;
 194         unsigned long flags;
 195         int write;
 196         int ret = 0;
 197
 198         spin_lock_irqsave(&rxq->lock, flags);
 199         write = rxq->write & ~0x7;
 200         while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
 201                 /* Get next free Rx buffer, remove from free list */
 202                 element = rxq->rx_free.next;
 203                 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
 204                 list_del(element);
 205
 206                 /* Point to Rx buffer via next RBD in circular buffer */
 207                 rxq->bd[rxq->write] = iwl_dma_addr2rbd_ptr(priv, rxb->aligned_dma_addr);
 208                 rxq->queue[rxq->write] = rxb;
 209                 rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
 210                 rxq->free_count--;
 211         }
 212         spin_unlock_irqrestore(&rxq->lock, flags);
 213         /* If the pre-allocated buffer pool is dropping low, schedule to
 214          * refill it */
 215         if (rxq->free_count <= RX_LOW_WATERMARK)
 216                 queue_work(priv->workqueue, &priv->rx_replenish);
 217
 218
 219         /* If we've added more space for the firmware to place data, tell it.
 220          * Increment device's write pointer in multiples of 8. */
 221         if (write != (rxq->write & ~0x7)) {
 222                 spin_lock_irqsave(&rxq->lock, flags);
 223                 rxq->need_update = 1;
 224                 spin_unlock_irqrestore(&rxq->lock, flags);
 225                 ret = iwl_rx_queue_update_write_ptr(priv, rxq);
 226         }
 227
 228         return ret;
 229 }
 230 EXPORT_SYMBOL(iwl_rx_queue_restock);
 231
 232
 233 /**
 234  * iwl_rx_replenish - Move all used packet from rx_used to rx_free
 235  *
 236  * When moving to rx_free an SKB is allocated for the slot.
 237  *
 238  * Also restock the Rx queue via iwl_rx_queue_restock.
 239  * This is called as a scheduled work item (except for during initialization)
 240  */
 241 void iwl_rx_allocate(struct iwl_priv *priv)
 242 {
 243         struct iwl_rx_queue *rxq = &priv->rxq;
 244         struct list_head *element;
 245         struct iwl_rx_mem_buffer *rxb;
 246         unsigned long flags;
 247
 248         while (1) {
 249                 spin_lock_irqsave(&rxq->lock, flags);
 250
 251                 if (list_empty(&rxq->rx_used)) {
 252                         spin_unlock_irqrestore(&rxq->lock, flags);
 253                         return;
 254                 }
 255                 element = rxq->rx_used.next;
 256                 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
 257                 list_del(element);
 258
 259                 spin_unlock_irqrestore(&rxq->lock, flags);
 260
 261                 /* Alloc a new receive buffer */
 262                 rxb->skb = alloc_skb(priv->hw_params.rx_buf_size + 256,
 263                                      GFP_KERNEL);
 264                 if (!rxb->skb) {
 265                         IWL_CRIT(priv, "Can not allocate SKB buffers\n");
 266                         /* We don't reschedule replenish work here -- we will
 267                          * call the restock method and if it still needs
 268                          * more buffers it will schedule replenish */
 269                         break;
 270                 }
 271
 272                 /* Get physical address of RB/SKB */
 273                 rxb->real_dma_addr = pci_map_single(
 274                                         priv->pci_dev,
 275                                         rxb->skb->data,
 276                                         priv->hw_params.rx_buf_size + 256,
 277                                         PCI_DMA_FROMDEVICE);
 278                 /* dma address must be no more than 36 bits */
 279                 BUG_ON(rxb->real_dma_addr & ~DMA_BIT_MASK(36));
 280                 /* and also 256 byte aligned! */
 281                 rxb->aligned_dma_addr = ALIGN(rxb->real_dma_addr, 256);
 282                 skb_reserve(rxb->skb, rxb->aligned_dma_addr - rxb->real_dma_addr);
 283
 284                 spin_lock_irqsave(&rxq->lock, flags);
 285
 286                 list_add_tail(&rxb->list, &rxq->rx_free);
 287                 rxq->free_count++;
 288                 priv->alloc_rxb_skb++;
 289
 290                 spin_unlock_irqrestore(&rxq->lock, flags);
 291         }
 292 }
 293
 294 void iwl_rx_replenish(struct iwl_priv *priv)
 295 {
 296         unsigned long flags;
 297
 298         iwl_rx_allocate(priv);
 299
 300         spin_lock_irqsave(&priv->lock, flags);
 301         iwl_rx_queue_restock(priv);
 302         spin_unlock_irqrestore(&priv->lock, flags);
 303 }
 304 EXPORT_SYMBOL(iwl_rx_replenish);
 305
 306
 307 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
 308  * If an SKB has been detached, the POOL needs to have its SKB set to NULL
 309  * This free routine walks the list of POOL entries and if SKB is set to
 310  * non NULL it is unmapped and freed
 311  */
 312 void iwl_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 313 {
 314         int i;
 315         for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
 316                 if (rxq->pool[i].skb != NULL) {
 317                         pci_unmap_single(priv->pci_dev,
 318                                          rxq->pool[i].real_dma_addr,
 319                                          priv->hw_params.rx_buf_size + 256,
 320                                          PCI_DMA_FROMDEVICE);
 321                         dev_kfree_skb(rxq->pool[i].skb);
 322                 }
 323         }
 324
 325         pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
 326                             rxq->dma_addr);
 327         pci_free_consistent(priv->pci_dev, sizeof(struct iwl_rb_status),
 328                             rxq->rb_stts, rxq->rb_stts_dma);
 329         rxq->bd = NULL;
 330         rxq->rb_stts  = NULL;
 331 }
 332 EXPORT_SYMBOL(iwl_rx_queue_free);
 333
 334 int iwl_rx_queue_alloc(struct iwl_priv *priv)
 335 {
 336         struct iwl_rx_queue *rxq = &priv->rxq;
 337         struct pci_dev *dev = priv->pci_dev;
 338         int i;
 339
 340         spin_lock_init(&rxq->lock);
 341         INIT_LIST_HEAD(&rxq->rx_free);
 342         INIT_LIST_HEAD(&rxq->rx_used);
 343
 344         /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
 345         rxq->bd = pci_alloc_consistent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr);
 346         if (!rxq->bd)
 347                 goto err_bd;
 348
 349         rxq->rb_stts = pci_alloc_consistent(dev, sizeof(struct iwl_rb_status),
 350                                         &rxq->rb_stts_dma);
 351         if (!rxq->rb_stts)
 352                 goto err_rb;
 353
 354         /* Fill the rx_used queue with _all_ of the Rx buffers */
 355         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
 356                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 357
 358         /* Set us so that we have processed and used all buffers, but have
 359          * not restocked the Rx queue with fresh buffers */
 360         rxq->read = rxq->write = 0;
 361         rxq->free_count = 0;
 362         rxq->need_update = 0;
 363         return 0;
 364
 365 err_rb:
 366         pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
 367                             rxq->dma_addr);
 368 err_bd:
 369         return -ENOMEM;
 370 }
 371 EXPORT_SYMBOL(iwl_rx_queue_alloc);
 372
 373 void iwl_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 374 {
 375         unsigned long flags;
 376         int i;
 377         spin_lock_irqsave(&rxq->lock, flags);
 378         INIT_LIST_HEAD(&rxq->rx_free);
 379         INIT_LIST_HEAD(&rxq->rx_used);
 380         /* Fill the rx_used queue with _all_ of the Rx buffers */
 381         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
 382                 /* In the reset function, these buffers may have been allocated
 383                  * to an SKB, so we need to unmap and free potential storage */
 384                 if (rxq->pool[i].skb != NULL) {
 385                         pci_unmap_single(priv->pci_dev,
 386                                          rxq->pool[i].real_dma_addr,
 387                                          priv->hw_params.rx_buf_size + 256,
 388                                          PCI_DMA_FROMDEVICE);
 389                         priv->alloc_rxb_skb--;
 390                         dev_kfree_skb(rxq->pool[i].skb);
 391                         rxq->pool[i].skb = NULL;
 392                 }
 393                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 394         }
 395
 396         /* Set us so that we have processed and used all buffers, but have
 397          * not restocked the Rx queue with fresh buffers */
 398         rxq->read = rxq->write = 0;
 399         rxq->free_count = 0;
 400         spin_unlock_irqrestore(&rxq->lock, flags);
 401 }
 402 EXPORT_SYMBOL(iwl_rx_queue_reset);
 403
 404 int iwl_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 405 {
 406         int ret;
 407         unsigned long flags;
 408         u32 rb_size;
 409         const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */
 410         const u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT why this stalls RX */
 411
 412         spin_lock_irqsave(&priv->lock, flags);
 413         ret = iwl_grab_nic_access(priv);
 414         if (ret) {
 415                 spin_unlock_irqrestore(&priv->lock, flags);
 416                 return ret;
 417         }
 418
 419         if (priv->cfg->mod_params->amsdu_size_8K)
 420                 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
 421         else
 422                 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
 423
 424         /* Stop Rx DMA */
 425         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 426
 427         /* Reset driver's Rx queue write index */
 428         iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
 429
 430         /* Tell device where to find RBD circular buffer in DRAM */
 431         iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
 432                            (u32)(rxq->dma_addr >> 8));
 433
 434         /* Tell device where in DRAM to update its Rx status */
 435         iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
 436                            rxq->rb_stts_dma >> 4);
 437
 438         /* Enable Rx DMA
 439          * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
 440          *      the credit mechanism in 5000 HW RX FIFO
 441          * Direct rx interrupts to hosts
 442          * Rx buffer size 4 or 8k
 443          * RB timeout 0x10
 444          * 256 RBDs
 445          */
 446         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
 447                            FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
 448                            FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
 449                            FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
 450                            FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK |
 451                            rb_size|
 452                            (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
 453                            (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
 454
 455         iwl_release_nic_access(priv);
 456
 457         iwl_write32(priv, CSR_INT_COALESCING, 0x40);
 458
 459         spin_unlock_irqrestore(&priv->lock, flags);
 460
 461         return 0;
 462 }
 463
 464 int iwl_rxq_stop(struct iwl_priv *priv)
 465 {
 466         int ret;
 467         unsigned long flags;
 468
 469         spin_lock_irqsave(&priv->lock, flags);
 470         ret = iwl_grab_nic_access(priv);
 471         if (unlikely(ret)) {
 472                 spin_unlock_irqrestore(&priv->lock, flags);
 473                 return ret;
 474         }
 475
 476         /* stop Rx DMA */
 477         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 478         iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
 479                             FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000);
 480
 481         iwl_release_nic_access(priv);
 482         spin_unlock_irqrestore(&priv->lock, flags);
 483
 484         return 0;
 485 }
 486 EXPORT_SYMBOL(iwl_rxq_stop);
 487
 488 void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
 489                                 struct iwl_rx_mem_buffer *rxb)
 490
 491 {
 492         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
 493         struct iwl_missed_beacon_notif *missed_beacon;
 494
 495         missed_beacon = &pkt->u.missed_beacon;
 496         if (le32_to_cpu(missed_beacon->consequtive_missed_beacons) > 5) {
 497                 IWL_DEBUG_CALIB("missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 498                     le32_to_cpu(missed_beacon->consequtive_missed_beacons),
 499                     le32_to_cpu(missed_beacon->total_missed_becons),
 500                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 501                     le32_to_cpu(missed_beacon->num_expected_beacons));
 502                 if (!test_bit(STATUS_SCANNING, &priv->status))
 503                         iwl_init_sensitivity(priv);
 504         }
 505 }
 506 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif);
 507
 508
 509 /* Calculate noise level, based on measurements during network silence just
 510  *   before arriving beacon.  This measurement can be done only if we know
 511  *   exactly when to expect beacons, therefore only when we're associated. */
 512 static void iwl_rx_calc_noise(struct iwl_priv *priv)
 513 {
 514         struct statistics_rx_non_phy *rx_info
 515                                 = &(priv->statistics.rx.general);
 516         int num_active_rx = 0;
 517         int total_silence = 0;
 518         int bcn_silence_a =
 519                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 520         int bcn_silence_b =
 521                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 522         int bcn_silence_c =
 523                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 524
 525         if (bcn_silence_a) {
 526                 total_silence += bcn_silence_a;
 527                 num_active_rx++;
 528         }
 529         if (bcn_silence_b) {
 530                 total_silence += bcn_silence_b;
 531                 num_active_rx++;
 532         }
 533         if (bcn_silence_c) {
 534                 total_silence += bcn_silence_c;
 535                 num_active_rx++;
 536         }
 537
 538         /* Average among active antennas */
 539         if (num_active_rx)
 540                 priv->last_rx_noise = (total_silence / num_active_rx) - 107;
 541         else
 542                 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 543
 544         IWL_DEBUG_CALIB("inband silence a %u, b %u, c %u, dBm %d\n",
 545                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 546                         priv->last_rx_noise);
 547 }
 548
 549 #define REG_RECALIB_PERIOD (60)
 550
 551 void iwl_rx_statistics(struct iwl_priv *priv,
 552                               struct iwl_rx_mem_buffer *rxb)
 553 {
 554         int change;
 555         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
 556
 557         IWL_DEBUG_RX("Statistics notification received (%d vs %d).\n",
 558                      (int)sizeof(priv->statistics), pkt->len);
 559
 560         change = ((priv->statistics.general.temperature !=
 561                    pkt->u.stats.general.temperature) ||
 562                   ((priv->statistics.flag &
 563                     STATISTICS_REPLY_FLG_FAT_MODE_MSK) !=
 564                    (pkt->u.stats.flag & STATISTICS_REPLY_FLG_FAT_MODE_MSK)));
 565
 566         memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics));
 567
 568         set_bit(STATUS_STATISTICS, &priv->status);
 569
 570         /* Reschedule the statistics timer to occur in
 571          * REG_RECALIB_PERIOD seconds to ensure we get a
 572          * thermal update even if the uCode doesn't give
 573          * us one */
 574         mod_timer(&priv->statistics_periodic, jiffies +
 575                   msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
 576
 577         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 578             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 579                 iwl_rx_calc_noise(priv);
 580                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 581         }
 582
 583         iwl_leds_background(priv);
 584
 585         if (priv->cfg->ops->lib->temperature && change)
 586                 priv->cfg->ops->lib->temperature(priv);
 587 }
 588 EXPORT_SYMBOL(iwl_rx_statistics);
 589
 590 #define PERFECT_RSSI (-20) /* dBm */
 591 #define WORST_RSSI (-95)   /* dBm */
 592 #define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
 593
 594 /* Calculate an indication of rx signal quality (a percentage, not dBm!).
 595  * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
 596  *   about formulas used below. */
 597 static int iwl_calc_sig_qual(int rssi_dbm, int noise_dbm)
 598 {
 599         int sig_qual;
 600         int degradation = PERFECT_RSSI - rssi_dbm;
 601
 602         /* If we get a noise measurement, use signal-to-noise ratio (SNR)
 603          * as indicator; formula is (signal dbm - noise dbm).
 604          * SNR at or above 40 is a great signal (100%).
 605          * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
 606          * Weakest usable signal is usually 10 - 15 dB SNR. */
 607         if (noise_dbm) {
 608                 if (rssi_dbm - noise_dbm >= 40)
 609                         return 100;
 610                 else if (rssi_dbm < noise_dbm)
 611                         return 0;
 612                 sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2;
 613
 614         /* Else use just the signal level.
 615          * This formula is a least squares fit of data points collected and
 616          *   compared with a reference system that had a percentage (%) display
 617          *   for signal quality. */
 618         } else
 619                 sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation *
 620                             (15 * RSSI_RANGE + 62 * degradation)) /
 621                            (RSSI_RANGE * RSSI_RANGE);
 622
 623         if (sig_qual > 100)
 624                 sig_qual = 100;
 625         else if (sig_qual < 1)
 626                 sig_qual = 0;
 627
 628         return sig_qual;
 629 }
 630
 631 /* Calc max signal level (dBm) among 3 possible receivers */
 632 static inline int iwl_calc_rssi(struct iwl_priv *priv,
 633                                 struct iwl_rx_phy_res *rx_resp)
 634 {
 635         return priv->cfg->ops->utils->calc_rssi(priv, rx_resp);
 636 }
 637
 638 #ifdef CONFIG_IWLWIFI_DEBUG
 639 /**
 640  * iwl_dbg_report_frame - dump frame to syslog during debug sessions
 641  *
 642  * You may hack this function to show different aspects of received frames,
 643  * including selective frame dumps.
 644  * group100 parameter selects whether to show 1 out of 100 good data frames.
 645  *    All beacon and probe response frames are printed.
 646  */
 647 static void iwl_dbg_report_frame(struct iwl_priv *priv,
 648                       struct iwl_rx_phy_res *phy_res, u16 length,
 649                       struct ieee80211_hdr *header, int group100)
 650 {
 651         u32 to_us;
 652         u32 print_summary = 0;
 653         u32 print_dump = 0;     /* set to 1 to dump all frames' contents */
 654         u32 hundred = 0;
 655         u32 dataframe = 0;
 656         __le16 fc;
 657         u16 seq_ctl;
 658         u16 channel;
 659         u16 phy_flags;
 660         u32 rate_n_flags;
 661         u32 tsf_low;
 662         int rssi;
 663
 664         if (likely(!(priv->debug_level & IWL_DL_RX)))
 665                 return;
 666
 667         /* MAC header */
 668         fc = header->frame_control;
 669         seq_ctl = le16_to_cpu(header->seq_ctrl);
 670
 671         /* metadata */
 672         channel = le16_to_cpu(phy_res->channel);
 673         phy_flags = le16_to_cpu(phy_res->phy_flags);
 674         rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
 675
 676         /* signal statistics */
 677         rssi = iwl_calc_rssi(priv, phy_res);
 678         tsf_low = le64_to_cpu(phy_res->timestamp) & 0x0ffffffff;
 679
 680         to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
 681
 682         /* if data frame is to us and all is good,
 683          *   (optionally) print summary for only 1 out of every 100 */
 684         if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
 685             cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
 686                 dataframe = 1;
 687                 if (!group100)
 688                         print_summary = 1;      /* print each frame */
 689                 else if (priv->framecnt_to_us < 100) {
 690                         priv->framecnt_to_us++;
 691                         print_summary = 0;
 692                 } else {
 693                         priv->framecnt_to_us = 0;
 694                         print_summary = 1;
 695                         hundred = 1;
 696                 }
 697         } else {
 698                 /* print summary for all other frames */
 699                 print_summary = 1;
 700         }
 701
 702         if (print_summary) {
 703                 char *title;
 704                 int rate_idx;
 705                 u32 bitrate;
 706
 707                 if (hundred)
 708                         title = "100Frames";
 709                 else if (ieee80211_has_retry(fc))
 710                         title = "Retry";
 711                 else if (ieee80211_is_assoc_resp(fc))
 712                         title = "AscRsp";
 713                 else if (ieee80211_is_reassoc_resp(fc))
 714                         title = "RasRsp";
 715                 else if (ieee80211_is_probe_resp(fc)) {
 716                         title = "PrbRsp";
 717                         print_dump = 1; /* dump frame contents */
 718                 } else if (ieee80211_is_beacon(fc)) {
 719                         title = "Beacon";
 720                         print_dump = 1; /* dump frame contents */
 721                 } else if (ieee80211_is_atim(fc))
 722                         title = "ATIM";
 723                 else if (ieee80211_is_auth(fc))
 724                         title = "Auth";
 725                 else if (ieee80211_is_deauth(fc))
 726                         title = "DeAuth";
 727                 else if (ieee80211_is_disassoc(fc))
 728                         title = "DisAssoc";
 729                 else
 730                         title = "Frame";
 731
 732                 rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 733                 if (unlikely((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT))) {
 734                         bitrate = 0;
 735                         WARN_ON_ONCE(1);
 736                 } else {
 737                         bitrate = iwl_rates[rate_idx].ieee / 2;
 738                 }
 739
 740                 /* print frame summary.
 741                  * MAC addresses show just the last byte (for brevity),
 742                  *    but you can hack it to show more, if you'd like to. */
 743                 if (dataframe)
 744                         IWL_DEBUG_RX("%s: mhd=0x%04x, dst=0x%02x, "
 745                                      "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
 746                                      title, le16_to_cpu(fc), header->addr1[5],
 747                                      length, rssi, channel, bitrate);
 748                 else {
 749                         /* src/dst addresses assume managed mode */
 750                         IWL_DEBUG_RX("%s: 0x%04x, dst=0x%02x, src=0x%02x, "
 751                                      "len=%u, rssi=%d, tim=%lu usec, "
 752                                      "phy=0x%02x, chnl=%d\n",
 753                                      title, le16_to_cpu(fc), header->addr1[5],
 754                                      header->addr3[5], length, rssi,
 755                                      tsf_low - priv->scan_start_tsf,
 756                                      phy_flags, channel);
 757                 }
 758         }
 759         if (print_dump)
 760                 iwl_print_hex_dump(priv, IWL_DL_RX, header, length);
 761 }
 762 #endif
 763
 764 static void iwl_update_rx_stats(struct iwl_priv *priv, u16 fc, u16 len)
 765 {
 766         /* 0 - mgmt, 1 - cnt, 2 - data */
 767         int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2;
 768         priv->rx_stats[idx].cnt++;
 769         priv->rx_stats[idx].bytes += len;
 770 }
 771
 772 /*
 773  * returns non-zero if packet should be dropped
 774  */
 775 static int iwl_set_decrypted_flag(struct iwl_priv *priv,
 776                                       struct ieee80211_hdr *hdr,
 777                                       u32 decrypt_res,
 778                                       struct ieee80211_rx_status *stats)
 779 {
 780         u16 fc = le16_to_cpu(hdr->frame_control);
 781
 782         if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
 783                 return 0;
 784
 785         if (!(fc & IEEE80211_FCTL_PROTECTED))
 786                 return 0;
 787
 788         IWL_DEBUG_RX("decrypt_res:0x%x\n", decrypt_res);
 789         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 790         case RX_RES_STATUS_SEC_TYPE_TKIP:
 791                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 792                  * Decryption will be done in SW. */
 793                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 794                     RX_RES_STATUS_BAD_KEY_TTAK)
 795                         break;
 796
 797         case RX_RES_STATUS_SEC_TYPE_WEP:
 798                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 799                     RX_RES_STATUS_BAD_ICV_MIC) {
 800                         /* bad ICV, the packet is destroyed since the
 801                          * decryption is inplace, drop it */
 802                         IWL_DEBUG_RX("Packet destroyed\n");
 803                         return -1;
 804                 }
 805         case RX_RES_STATUS_SEC_TYPE_CCMP:
 806                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 807                     RX_RES_STATUS_DECRYPT_OK) {
 808                         IWL_DEBUG_RX("hw decrypt successfully!!!\n");
 809                         stats->flag |= RX_FLAG_DECRYPTED;
 810                 }
 811                 break;
 812
 813         default:
 814                 break;
 815         }
 816         return 0;
 817 }
 818
 819 static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
 820 {
 821         u32 decrypt_out = 0;
 822
 823         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
 824                                         RX_RES_STATUS_STATION_FOUND)
 825                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
 826                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
 827
 828         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
 829
 830         /* packet was not encrypted */
 831         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 832                                         RX_RES_STATUS_SEC_TYPE_NONE)
 833                 return decrypt_out;
 834
 835         /* packet was encrypted with unknown alg */
 836         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 837                                         RX_RES_STATUS_SEC_TYPE_ERR)
 838                 return decrypt_out;
 839
 840         /* decryption was not done in HW */
 841         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
 842                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
 843                 return decrypt_out;
 844
 845         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
 846
 847         case RX_RES_STATUS_SEC_TYPE_CCMP:
 848                 /* alg is CCM: check MIC only */
 849                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
 850                         /* Bad MIC */
 851                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 852                 else
 853                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 854
 855                 break;
 856
 857         case RX_RES_STATUS_SEC_TYPE_TKIP:
 858                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
 859                         /* Bad TTAK */
 860                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
 861                         break;
 862                 }
 863                 /* fall through if TTAK OK */
 864         default:
 865                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
 866                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 867                 else
 868                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 869                 break;
 870         };
 871
 872         IWL_DEBUG_RX("decrypt_in:0x%x  decrypt_out = 0x%x\n",
 873                                         decrypt_in, decrypt_out);
 874
 875         return decrypt_out;
 876 }
 877
 878 static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 879                                        int include_phy,
 880                                        struct iwl_rx_mem_buffer *rxb,
 881                                        struct ieee80211_rx_status *stats)
 882 {
 883         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
 884         struct iwl_rx_phy_res *rx_start = (include_phy) ?
 885             (struct iwl_rx_phy_res *)&(pkt->u.raw[0]) : NULL;
 886         struct ieee80211_hdr *hdr;
 887         u16 len;
 888         __le32 *rx_end;
 889         unsigned int skblen;
 890         u32 ampdu_status;
 891         u32 ampdu_status_legacy;
 892
 893         if (!include_phy && priv->last_phy_res[0])
 894                 rx_start = (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
 895
 896         if (!rx_start) {
 897                 IWL_ERR(priv, "MPDU frame without a PHY data\n");
 898                 return;
 899         }
 900         if (include_phy) {
 901                 hdr = (struct ieee80211_hdr *)((u8 *) &rx_start[1] +
 902                                                rx_start->cfg_phy_cnt);
 903
 904                 len = le16_to_cpu(rx_start->byte_count);
 905
 906                 rx_end = (__le32 *)((u8 *) &pkt->u.raw[0] +
 907                                   sizeof(struct iwl_rx_phy_res) +
 908                                   rx_start->cfg_phy_cnt + len);
 909
 910         } else {
 911                 struct iwl4965_rx_mpdu_res_start *amsdu =
 912                     (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
 913
 914                 hdr = (struct ieee80211_hdr *)(pkt->u.raw +
 915                                sizeof(struct iwl4965_rx_mpdu_res_start));
 916                 len =  le16_to_cpu(amsdu->byte_count);
 917                 rx_start->byte_count = amsdu->byte_count;
 918                 rx_end = (__le32 *) (((u8 *) hdr) + len);
 919         }
 920
 921         ampdu_status = le32_to_cpu(*rx_end);
 922         skblen = ((u8 *) rx_end - (u8 *) &pkt->u.raw[0]) + sizeof(u32);
 923
 924         if (!include_phy) {
 925                 /* New status scheme, need to translate */
 926                 ampdu_status_legacy = ampdu_status;
 927                 ampdu_status = iwl_translate_rx_status(priv, ampdu_status);
 928         }
 929
 930         /* start from MAC */
 931         skb_reserve(rxb->skb, (void *)hdr - (void *)pkt);
 932         skb_put(rxb->skb, len); /* end where data ends */
 933
 934         /* We only process data packets if the interface is open */
 935         if (unlikely(!priv->is_open)) {
 936                 IWL_DEBUG_DROP_LIMIT
 937                     ("Dropping packet while interface is not open.\n");
 938                 return;
 939         }
 940
 941         hdr = (struct ieee80211_hdr *)rxb->skb->data;
 942
 943         /*  in case of HW accelerated crypto and bad decryption, drop */
 944         if (!priv->hw_params.sw_crypto &&
 945             iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
 946                 return;
 947
 948         iwl_update_rx_stats(priv, le16_to_cpu(hdr->frame_control), len);
 949         ieee80211_rx_irqsafe(priv->hw, rxb->skb, stats);
 950         priv->alloc_rxb_skb--;
 951         rxb->skb = NULL;
 952 }
 953
 954 /* This is necessary only for a number of statistics, see the caller. */
 955 static int iwl_is_network_packet(struct iwl_priv *priv,
 956                 struct ieee80211_hdr *header)
 957 {
 958         /* Filter incoming packets to determine if they are targeted toward
 959          * this network, discarding packets coming from ourselves */
 960         switch (priv->iw_mode) {
 961         case NL80211_IFTYPE_ADHOC: /* Header: Dest. | Source    | BSSID */
 962                 /* packets to our IBSS update information */
 963                 return !compare_ether_addr(header->addr3, priv->bssid);
 964         case NL80211_IFTYPE_STATION: /* Header: Dest. | AP{BSSID} | Source */
 965                 /* packets to our IBSS update information */
 966                 return !compare_ether_addr(header->addr2, priv->bssid);
 967         default:
 968                 return 1;
 969         }
 970 }
 971
 972 /* Called for REPLY_RX (legacy ABG frames), or
 973  * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
 974 void iwl_rx_reply_rx(struct iwl_priv *priv,
 975                                 struct iwl_rx_mem_buffer *rxb)
 976 {
 977         struct ieee80211_hdr *header;
 978         struct ieee80211_rx_status rx_status;
 979         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
 980         /* Use phy data (Rx signal strength, etc.) contained within
 981          *   this rx packet for legacy frames,
 982          *   or phy data cached from REPLY_RX_PHY_CMD for HT frames. */
 983         int include_phy = (pkt->hdr.cmd == REPLY_RX);
 984         struct iwl_rx_phy_res *rx_start = (include_phy) ?
 985                 (struct iwl_rx_phy_res *)&(pkt->u.raw[0]) :
 986                 (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
 987         __le32 *rx_end;
 988         unsigned int len = 0;
 989         u16 fc;
 990         u8 network_packet;
 991
 992         rx_status.mactime = le64_to_cpu(rx_start->timestamp);
 993         rx_status.freq =
 994                 ieee80211_channel_to_frequency(le16_to_cpu(rx_start->channel));
 995         rx_status.band = (rx_start->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
 996                                 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 997         rx_status.rate_idx =
 998                 iwl_hwrate_to_plcp_idx(le32_to_cpu(rx_start->rate_n_flags));
 999         if (rx_status.band == IEEE80211_BAND_5GHZ)
1000                 rx_status.rate_idx -= IWL_FIRST_OFDM_RATE;
1001
1002         rx_status.flag = 0;
1003
1004         /* TSF isn't reliable. In order to allow smooth user experience,
1005          * this W/A doesn't propagate it to the mac80211 */
1006         /*rx_status.flag |= RX_FLAG_TSFT;*/
1007
1008         if ((unlikely(rx_start->cfg_phy_cnt > 20))) {
1009                 IWL_DEBUG_DROP("dsp size out of range [0,20]: %d/n",
1010                                 rx_start->cfg_phy_cnt);
1011                 return;
1012         }
1013
1014         if (!include_phy) {
1015                 if (priv->last_phy_res[0])
1016                         rx_start = (struct iwl_rx_phy_res *)
1017                                 &priv->last_phy_res[1];
1018                 else
1019                         rx_start = NULL;
1020         }
1021
1022         if (!rx_start) {
1023                 IWL_ERR(priv, "MPDU frame without a PHY data\n");
1024                 return;
1025         }
1026
1027         if (include_phy) {
1028                 header = (struct ieee80211_hdr *)((u8 *) &rx_start[1]
1029                                                   + rx_start->cfg_phy_cnt);
1030
1031                 len = le16_to_cpu(rx_start->byte_count);
1032                 rx_end = (__le32 *)(pkt->u.raw + rx_start->cfg_phy_cnt +
1033                                   sizeof(struct iwl_rx_phy_res) + len);
1034         } else {
1035                 struct iwl4965_rx_mpdu_res_start *amsdu =
1036                         (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
1037
1038                 header = (void *)(pkt->u.raw +
1039                         sizeof(struct iwl4965_rx_mpdu_res_start));
1040                 len = le16_to_cpu(amsdu->byte_count);
1041                 rx_end = (__le32 *) (pkt->u.raw +
1042                         sizeof(struct iwl4965_rx_mpdu_res_start) + len);
1043         }
1044
1045         if (!(*rx_end & RX_RES_STATUS_NO_CRC32_ERROR) ||
1046             !(*rx_end & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
1047                 IWL_DEBUG_RX("Bad CRC or FIFO: 0x%08X.\n",
1048                                 le32_to_cpu(*rx_end));
1049                 return;
1050         }
1051
1052         priv->ucode_beacon_time = le32_to_cpu(rx_start->beacon_time_stamp);
1053
1054         /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1055         rx_status.signal = iwl_calc_rssi(priv, rx_start);
1056
1057         /* Meaningful noise values are available only from beacon statistics,
1058          *   which are gathered only when associated, and indicate noise
1059          *   only for the associated network channel ...
1060          * Ignore these noise values while scanning (other channels) */
1061         if (iwl_is_associated(priv) &&
1062             !test_bit(STATUS_SCANNING, &priv->status)) {
1063                 rx_status.noise = priv->last_rx_noise;
1064                 rx_status.qual = iwl_calc_sig_qual(rx_status.signal,
1065                                                          rx_status.noise);
1066         } else {
1067                 rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1068                 rx_status.qual = iwl_calc_sig_qual(rx_status.signal, 0);
1069         }
1070
1071         /* Reset beacon noise level if not associated. */
1072         if (!iwl_is_associated(priv))
1073                 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1074
1075         /* Set "1" to report good data frames in groups of 100 */
1076 #ifdef CONFIG_IWLWIFI_DEBUG
1077         if (unlikely(priv->debug_level & IWL_DL_RX))
1078                 iwl_dbg_report_frame(priv, rx_start, len, header, 1);
1079 #endif
1080         IWL_DEBUG_STATS_LIMIT("Rssi %d, noise %d, qual %d, TSF %llu\n",
1081                 rx_status.signal, rx_status.noise, rx_status.signal,
1082                 (unsigned long long)rx_status.mactime);
1083
1084         /*
1085          * "antenna number"
1086          *
1087          * It seems that the antenna field in the phy flags value
1088          * is actually a bit field. This is undefined by radiotap,
1089          * it wants an actual antenna number but I always get "7"
1090          * for most legacy frames I receive indicating that the
1091          * same frame was received on all three RX chains.
1092          *
1093          * I think this field should be removed in favor of a
1094          * new 802.11n radiotap field "RX chains" that is defined
1095          * as a bitmask.
1096          */
1097         rx_status.antenna = le16_to_cpu(rx_start->phy_flags &
1098                                         RX_RES_PHY_FLAGS_ANTENNA_MSK) >> 4;
1099
1100         /* set the preamble flag if appropriate */
1101         if (rx_start->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
1102                 rx_status.flag |= RX_FLAG_SHORTPRE;
1103
1104         /* Take shortcut when only in monitor mode */
1105         if (priv->iw_mode == NL80211_IFTYPE_MONITOR) {
1106                 iwl_pass_packet_to_mac80211(priv, include_phy,
1107                                                  rxb, &rx_status);
1108                 return;
1109         }
1110
1111         network_packet = iwl_is_network_packet(priv, header);
1112         if (network_packet) {
1113                 priv->last_rx_rssi = rx_status.signal;
1114                 priv->last_beacon_time =  priv->ucode_beacon_time;
1115                 priv->last_tsf = le64_to_cpu(rx_start->timestamp);
1116         }
1117
1118         fc = le16_to_cpu(header->frame_control);
1119         switch (fc & IEEE80211_FCTL_FTYPE) {
1120         case IEEE80211_FTYPE_MGMT:
1121         case IEEE80211_FTYPE_DATA:
1122                 if (priv->iw_mode == NL80211_IFTYPE_AP)
1123                         iwl_update_ps_mode(priv, fc  & IEEE80211_FCTL_PM,
1124                                                 header->addr2);
1125                 /* fall through */
1126         default:
1127                         iwl_pass_packet_to_mac80211(priv, include_phy, rxb,
1128                                    &rx_status);
1129                 break;
1130
1131         }
1132 }
1133 EXPORT_SYMBOL(iwl_rx_reply_rx);
1134
1135 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1136  * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1137 void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
1138                                     struct iwl_rx_mem_buffer *rxb)
1139 {
1140         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
1141         priv->last_phy_res[0] = 1;
1142         memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
1143                sizeof(struct iwl_rx_phy_res));
1144 }
1145 EXPORT_SYMBOL(iwl_rx_reply_rx_phy);