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-calib.h"
  40 #include "iwl-helpers.h"
  41 /************************** RX-FUNCTIONS ****************************/
  42 /*
  43  * Rx theory of operation
  44  *
  45  * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
  46  * each of which point to Receive Buffers to be filled by the NIC.  These get
  47  * used not only for Rx frames, but for any command response or notification
  48  * from the NIC.  The driver and NIC manage the Rx buffers by means
  49  * of indexes into the circular buffer.
  50  *
  51  * Rx Queue Indexes
  52  * The host/firmware share two index registers for managing the Rx buffers.
  53  *
  54  * The READ index maps to the first position that the firmware may be writing
  55  * to -- the driver can read up to (but not including) this position and get
  56  * good data.
  57  * The READ index is managed by the firmware once the card is enabled.
  58  *
  59  * The WRITE index maps to the last position the driver has read from -- the
  60  * position preceding WRITE is the last slot the firmware can place a packet.
  61  *
  62  * The queue is empty (no good data) if WRITE = READ - 1, and is full if
  63  * WRITE = READ.
  64  *
  65  * During initialization, the host sets up the READ queue position to the first
  66  * INDEX position, and WRITE to the last (READ - 1 wrapped)
  67  *
  68  * When the firmware places a packet in a buffer, it will advance the READ index
  69  * and fire the RX interrupt.  The driver can then query the READ index and
  70  * process as many packets as possible, moving the WRITE index forward as it
  71  * resets the Rx queue buffers with new memory.
  72  *
  73  * The management in the driver is as follows:
  74  * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
  75  *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
  76  *   to replenish the iwl->rxq->rx_free.
  77  * + In iwl_rx_replenish (scheduled) if 'processed' != 'read' then the
  78  *   iwl->rxq is replenished and the READ INDEX is updated (updating the
  79  *   'processed' and 'read' driver indexes as well)
  80  * + A received packet is processed and handed to the kernel network stack,
  81  *   detached from the iwl->rxq.  The driver 'processed' index is updated.
  82  * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
  83  *   list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
  84  *   INDEX is not incremented and iwl->status(RX_STALLED) is set.  If there
  85  *   were enough free buffers and RX_STALLED is set it is cleared.
  86  *
  87  *
  88  * Driver sequence:
  89  *
  90  * iwl_rx_queue_alloc()   Allocates rx_free
  91  * iwl_rx_replenish()     Replenishes rx_free list from rx_used, and calls
  92  *                            iwl_rx_queue_restock
  93  * iwl_rx_queue_restock() Moves available buffers from rx_free into Rx
  94  *                            queue, updates firmware pointers, and updates
  95  *                            the WRITE index.  If insufficient rx_free buffers
  96  *                            are available, schedules iwl_rx_replenish
  97  *
  98  * -- enable interrupts --
  99  * ISR - iwl_rx()         Detach iwl_rx_mem_buffers from pool up to the
 100  *                            READ INDEX, detaching the SKB from the pool.
 101  *                            Moves the packet buffer from queue to rx_used.
 102  *                            Calls iwl_rx_queue_restock to refill any empty
 103  *                            slots.
 104  * ...
 105  *
 106  */
 107
 108 /**
 109  * iwl_rx_queue_space - Return number of free slots available in queue.
 110  */
 111 int iwl_rx_queue_space(const struct iwl_rx_queue *q)
 112 {
 113         int s = q->read - q->write;
 114         if (s <= 0)
 115                 s += RX_QUEUE_SIZE;
 116         /* keep some buffer to not confuse full and empty queue */
 117         s -= 2;
 118         if (s < 0)
 119                 s = 0;
 120         return s;
 121 }
 122 EXPORT_SYMBOL(iwl_rx_queue_space);
 123
 124 /**
 125  * iwl_rx_queue_update_write_ptr - Update the write pointer for the RX queue
 126  */
 127 void iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q)
 128 {
 129         unsigned long flags;
 130         u32 rx_wrt_ptr_reg = priv->hw_params.rx_wrt_ptr_reg;
 131         u32 reg;
 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_DEBUG_INFO(priv, "Rx queue requesting wakeup, GP1 = 0x%x\n",
 144                                       reg);
 145                         iwl_set_bit(priv, CSR_GP_CNTRL,
 146                                     CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 147                         goto exit_unlock;
 148                 }
 149
 150                 q->write_actual = (q->write & ~0x7);
 151                 iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual);
 152
 153         /* Else device is assumed to be awake */
 154         } else {
 155                 /* Device expects a multiple of 8 */
 156                 q->write_actual = (q->write & ~0x7);
 157                 iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual);
 158         }
 159
 160         q->need_update = 0;
 161
 162  exit_unlock:
 163         spin_unlock_irqrestore(&q->lock, flags);
 164 }
 165 EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr);
 166 /**
 167  * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
 168  */
 169 static inline __le32 iwl_dma_addr2rbd_ptr(struct iwl_priv *priv,
 170                                           dma_addr_t dma_addr)
 171 {
 172         return cpu_to_le32((u32)(dma_addr >> 8));
 173 }
 174
 175 /**
 176  * iwl_rx_queue_restock - refill RX queue from pre-allocated pool
 177  *
 178  * If there are slots in the RX queue that need to be restocked,
 179  * and we have free pre-allocated buffers, fill the ranks as much
 180  * as we can, pulling from rx_free.
 181  *
 182  * This moves the 'write' index forward to catch up with 'processed', and
 183  * also updates the memory address in the firmware to reference the new
 184  * target buffer.
 185  */
 186 void iwl_rx_queue_restock(struct iwl_priv *priv)
 187 {
 188         struct iwl_rx_queue *rxq = &priv->rxq;
 189         struct list_head *element;
 190         struct iwl_rx_mem_buffer *rxb;
 191         unsigned long flags;
 192         int write;
 193
 194         spin_lock_irqsave(&rxq->lock, flags);
 195         write = rxq->write & ~0x7;
 196         while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
 197                 /* Get next free Rx buffer, remove from free list */
 198                 element = rxq->rx_free.next;
 199                 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
 200                 list_del(element);
 201
 202                 /* Point to Rx buffer via next RBD in circular buffer */
 203                 rxq->bd[rxq->write] = iwl_dma_addr2rbd_ptr(priv, rxb->page_dma);
 204                 rxq->queue[rxq->write] = rxb;
 205                 rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
 206                 rxq->free_count--;
 207         }
 208         spin_unlock_irqrestore(&rxq->lock, flags);
 209         /* If the pre-allocated buffer pool is dropping low, schedule to
 210          * refill it */
 211         if (rxq->free_count <= RX_LOW_WATERMARK)
 212                 queue_work(priv->workqueue, &priv->rx_replenish);
 213
 214
 215         /* If we've added more space for the firmware to place data, tell it.
 216          * Increment device's write pointer in multiples of 8. */
 217         if (rxq->write_actual != (rxq->write & ~0x7)) {
 218                 spin_lock_irqsave(&rxq->lock, flags);
 219                 rxq->need_update = 1;
 220                 spin_unlock_irqrestore(&rxq->lock, flags);
 221                 iwl_rx_queue_update_write_ptr(priv, rxq);
 222         }
 223 }
 224 EXPORT_SYMBOL(iwl_rx_queue_restock);
 225
 226
 227 /**
 228  * iwl_rx_replenish - Move all used packet from rx_used to rx_free
 229  *
 230  * When moving to rx_free an SKB is allocated for the slot.
 231  *
 232  * Also restock the Rx queue via iwl_rx_queue_restock.
 233  * This is called as a scheduled work item (except for during initialization)
 234  */
 235 void iwl_rx_allocate(struct iwl_priv *priv, gfp_t priority)
 236 {
 237         struct iwl_rx_queue *rxq = &priv->rxq;
 238         struct list_head *element;
 239         struct iwl_rx_mem_buffer *rxb;
 240         struct page *page;
 241         unsigned long flags;
 242         gfp_t gfp_mask = priority;
 243
 244         while (1) {
 245                 spin_lock_irqsave(&rxq->lock, flags);
 246                 if (list_empty(&rxq->rx_used)) {
 247                         spin_unlock_irqrestore(&rxq->lock, flags);
 248                         return;
 249                 }
 250                 spin_unlock_irqrestore(&rxq->lock, flags);
 251
 252                 if (rxq->free_count > RX_LOW_WATERMARK)
 253                         gfp_mask |= __GFP_NOWARN;
 254
 255                 if (priv->hw_params.rx_page_order > 0)
 256                         gfp_mask |= __GFP_COMP;
 257
 258                 /* Alloc a new receive buffer */
 259                 page = alloc_pages(gfp_mask, priv->hw_params.rx_page_order);
 260                 if (!page) {
 261                         if (net_ratelimit())
 262                                 IWL_DEBUG_INFO(priv, "alloc_pages failed, "
 263                                                "order: %d\n",
 264                                                priv->hw_params.rx_page_order);
 265
 266                         if ((rxq->free_count <= RX_LOW_WATERMARK) &&
 267                             net_ratelimit())
 268                                 IWL_CRIT(priv, "Failed to alloc_pages with %s. Only %u free buffers remaining.\n",
 269                                          priority == GFP_ATOMIC ?  "GFP_ATOMIC" : "GFP_KERNEL",
 270                                          rxq->free_count);
 271                         /* We don't reschedule replenish work here -- we will
 272                          * call the restock method and if it still needs
 273                          * more buffers it will schedule replenish */
 274                         return;
 275                 }
 276
 277                 spin_lock_irqsave(&rxq->lock, flags);
 278
 279                 if (list_empty(&rxq->rx_used)) {
 280                         spin_unlock_irqrestore(&rxq->lock, flags);
 281                         __free_pages(page, priv->hw_params.rx_page_order);
 282                         return;
 283                 }
 284                 element = rxq->rx_used.next;
 285                 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
 286                 list_del(element);
 287
 288                 spin_unlock_irqrestore(&rxq->lock, flags);
 289
 290                 rxb->page = page;
 291                 /* Get physical address of the RB */
 292                 rxb->page_dma = pci_map_page(priv->pci_dev, page, 0,
 293                                 PAGE_SIZE << priv->hw_params.rx_page_order,
 294                                 PCI_DMA_FROMDEVICE);
 295                 /* dma address must be no more than 36 bits */
 296                 BUG_ON(rxb->page_dma & ~DMA_BIT_MASK(36));
 297                 /* and also 256 byte aligned! */
 298                 BUG_ON(rxb->page_dma & DMA_BIT_MASK(8));
 299
 300                 spin_lock_irqsave(&rxq->lock, flags);
 301
 302                 list_add_tail(&rxb->list, &rxq->rx_free);
 303                 rxq->free_count++;
 304                 priv->alloc_rxb_page++;
 305
 306                 spin_unlock_irqrestore(&rxq->lock, flags);
 307         }
 308 }
 309
 310 void iwl_rx_replenish(struct iwl_priv *priv)
 311 {
 312         unsigned long flags;
 313
 314         iwl_rx_allocate(priv, GFP_KERNEL);
 315
 316         spin_lock_irqsave(&priv->lock, flags);
 317         iwl_rx_queue_restock(priv);
 318         spin_unlock_irqrestore(&priv->lock, flags);
 319 }
 320 EXPORT_SYMBOL(iwl_rx_replenish);
 321
 322 void iwl_rx_replenish_now(struct iwl_priv *priv)
 323 {
 324         iwl_rx_allocate(priv, GFP_ATOMIC);
 325
 326         iwl_rx_queue_restock(priv);
 327 }
 328 EXPORT_SYMBOL(iwl_rx_replenish_now);
 329
 330
 331 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
 332  * If an SKB has been detached, the POOL needs to have its SKB set to NULL
 333  * This free routine walks the list of POOL entries and if SKB is set to
 334  * non NULL it is unmapped and freed
 335  */
 336 void iwl_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 337 {
 338         int i;
 339         for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
 340                 if (rxq->pool[i].page != NULL) {
 341                         pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
 342                                 PAGE_SIZE << priv->hw_params.rx_page_order,
 343                                 PCI_DMA_FROMDEVICE);
 344                         __iwl_free_pages(priv, rxq->pool[i].page);
 345                         rxq->pool[i].page = NULL;
 346                 }
 347         }
 348
 349         dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
 350                           rxq->dma_addr);
 351         dma_free_coherent(&priv->pci_dev->dev, sizeof(struct iwl_rb_status),
 352                           rxq->rb_stts, rxq->rb_stts_dma);
 353         rxq->bd = NULL;
 354         rxq->rb_stts  = NULL;
 355 }
 356 EXPORT_SYMBOL(iwl_rx_queue_free);
 357
 358 int iwl_rx_queue_alloc(struct iwl_priv *priv)
 359 {
 360         struct iwl_rx_queue *rxq = &priv->rxq;
 361         struct device *dev = &priv->pci_dev->dev;
 362         int i;
 363
 364         spin_lock_init(&rxq->lock);
 365         INIT_LIST_HEAD(&rxq->rx_free);
 366         INIT_LIST_HEAD(&rxq->rx_used);
 367
 368         /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
 369         rxq->bd = dma_alloc_coherent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr,
 370                                      GFP_KERNEL);
 371         if (!rxq->bd)
 372                 goto err_bd;
 373
 374         rxq->rb_stts = dma_alloc_coherent(dev, sizeof(struct iwl_rb_status),
 375                                           &rxq->rb_stts_dma, GFP_KERNEL);
 376         if (!rxq->rb_stts)
 377                 goto err_rb;
 378
 379         /* Fill the rx_used queue with _all_ of the Rx buffers */
 380         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
 381                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 382
 383         /* Set us so that we have processed and used all buffers, but have
 384          * not restocked the Rx queue with fresh buffers */
 385         rxq->read = rxq->write = 0;
 386         rxq->write_actual = 0;
 387         rxq->free_count = 0;
 388         rxq->need_update = 0;
 389         return 0;
 390
 391 err_rb:
 392         dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
 393                           rxq->dma_addr);
 394 err_bd:
 395         return -ENOMEM;
 396 }
 397 EXPORT_SYMBOL(iwl_rx_queue_alloc);
 398
 399 void iwl_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 400 {
 401         unsigned long flags;
 402         int i;
 403         spin_lock_irqsave(&rxq->lock, flags);
 404         INIT_LIST_HEAD(&rxq->rx_free);
 405         INIT_LIST_HEAD(&rxq->rx_used);
 406         /* Fill the rx_used queue with _all_ of the Rx buffers */
 407         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
 408                 /* In the reset function, these buffers may have been allocated
 409                  * to an SKB, so we need to unmap and free potential storage */
 410                 if (rxq->pool[i].page != NULL) {
 411                         pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
 412                                 PAGE_SIZE << priv->hw_params.rx_page_order,
 413                                 PCI_DMA_FROMDEVICE);
 414                         __iwl_free_pages(priv, rxq->pool[i].page);
 415                         rxq->pool[i].page = NULL;
 416                 }
 417                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 418         }
 419
 420         /* Set us so that we have processed and used all buffers, but have
 421          * not restocked the Rx queue with fresh buffers */
 422         rxq->read = rxq->write = 0;
 423         rxq->write_actual = 0;
 424         rxq->free_count = 0;
 425         spin_unlock_irqrestore(&rxq->lock, flags);
 426 }
 427
 428 int iwl_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 429 {
 430         u32 rb_size;
 431         const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */
 432         u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
 433
 434         if (!priv->cfg->use_isr_legacy)
 435                 rb_timeout = RX_RB_TIMEOUT;
 436
 437         if (priv->cfg->mod_params->amsdu_size_8K)
 438                 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
 439         else
 440                 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
 441
 442         /* Stop Rx DMA */
 443         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 444
 445         /* Reset driver's Rx queue write index */
 446         iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
 447
 448         /* Tell device where to find RBD circular buffer in DRAM */
 449         iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
 450                            (u32)(rxq->dma_addr >> 8));
 451
 452         /* Tell device where in DRAM to update its Rx status */
 453         iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
 454                            rxq->rb_stts_dma >> 4);
 455
 456         /* Enable Rx DMA
 457          * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
 458          *      the credit mechanism in 5000 HW RX FIFO
 459          * Direct rx interrupts to hosts
 460          * Rx buffer size 4 or 8k
 461          * RB timeout 0x10
 462          * 256 RBDs
 463          */
 464         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
 465                            FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
 466                            FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
 467                            FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
 468                            FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK |
 469                            rb_size|
 470                            (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
 471                            (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
 472
 473         /* Set interrupt coalescing timer to default (2048 usecs) */
 474         iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF);
 475
 476         return 0;
 477 }
 478
 479 int iwl_rxq_stop(struct iwl_priv *priv)
 480 {
 481
 482         /* stop Rx DMA */
 483         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 484         iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
 485                             FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000);
 486
 487         return 0;
 488 }
 489 EXPORT_SYMBOL(iwl_rxq_stop);
 490
 491 void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
 492                                 struct iwl_rx_mem_buffer *rxb)
 493
 494 {
 495         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 496         struct iwl_missed_beacon_notif *missed_beacon;
 497
 498         missed_beacon = &pkt->u.missed_beacon;
 499         if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
 500             priv->missed_beacon_threshold) {
 501                 IWL_DEBUG_CALIB(priv, "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 502                     le32_to_cpu(missed_beacon->consecutive_missed_beacons),
 503                     le32_to_cpu(missed_beacon->total_missed_becons),
 504                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 505                     le32_to_cpu(missed_beacon->num_expected_beacons));
 506                 if (!test_bit(STATUS_SCANNING, &priv->status))
 507                         iwl_init_sensitivity(priv);
 508         }
 509 }
 510 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif);
 511
 512 void iwl_rx_spectrum_measure_notif(struct iwl_priv *priv,
 513                                           struct iwl_rx_mem_buffer *rxb)
 514 {
 515         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 516         struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif);
 517
 518         if (!report->state) {
 519                 IWL_DEBUG_11H(priv,
 520                         "Spectrum Measure Notification: Start\n");
 521                 return;
 522         }
 523
 524         memcpy(&priv->measure_report, report, sizeof(*report));
 525         priv->measurement_status |= MEASUREMENT_READY;
 526 }
 527 EXPORT_SYMBOL(iwl_rx_spectrum_measure_notif);
 528
 529
 530
 531 /* Calculate noise level, based on measurements during network silence just
 532  *   before arriving beacon.  This measurement can be done only if we know
 533  *   exactly when to expect beacons, therefore only when we're associated. */
 534 static void iwl_rx_calc_noise(struct iwl_priv *priv)
 535 {
 536         struct statistics_rx_non_phy *rx_info
 537                                 = &(priv->statistics.rx.general);
 538         int num_active_rx = 0;
 539         int total_silence = 0;
 540         int bcn_silence_a =
 541                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 542         int bcn_silence_b =
 543                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 544         int bcn_silence_c =
 545                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 546
 547         if (bcn_silence_a) {
 548                 total_silence += bcn_silence_a;
 549                 num_active_rx++;
 550         }
 551         if (bcn_silence_b) {
 552                 total_silence += bcn_silence_b;
 553                 num_active_rx++;
 554         }
 555         if (bcn_silence_c) {
 556                 total_silence += bcn_silence_c;
 557                 num_active_rx++;
 558         }
 559
 560         /* Average among active antennas */
 561         if (num_active_rx)
 562                 priv->last_rx_noise = (total_silence / num_active_rx) - 107;
 563         else
 564                 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 565
 566         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 567                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 568                         priv->last_rx_noise);
 569 }
 570
 571 #ifdef CONFIG_IWLWIFI_DEBUG
 572 /*
 573  *  based on the assumption of all statistics counter are in DWORD
 574  *  FIXME: This function is for debugging, do not deal with
 575  *  the case of counters roll-over.
 576  */
 577 static void iwl_accumulative_statistics(struct iwl_priv *priv,
 578                                         __le32 *stats)
 579 {
 580         int i;
 581         __le32 *prev_stats;
 582         u32 *accum_stats;
 583         u32 *delta, *max_delta;
 584
 585         prev_stats = (__le32 *)&priv->statistics;
 586         accum_stats = (u32 *)&priv->accum_statistics;
 587         delta = (u32 *)&priv->delta_statistics;
 588         max_delta = (u32 *)&priv->max_delta;
 589
 590         for (i = sizeof(__le32); i < sizeof(struct iwl_notif_statistics);
 591              i += sizeof(__le32), stats++, prev_stats++, delta++,
 592              max_delta++, accum_stats++) {
 593                 if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
 594                         *delta = (le32_to_cpu(*stats) -
 595                                 le32_to_cpu(*prev_stats));
 596                         *accum_stats += *delta;
 597                         if (*delta > *max_delta)
 598                                 *max_delta = *delta;
 599                 }
 600         }
 601
 602         /* reset accumulative statistics for "no-counter" type statistics */
 603         priv->accum_statistics.general.temperature =
 604                 priv->statistics.general.temperature;
 605         priv->accum_statistics.general.temperature_m =
 606                 priv->statistics.general.temperature_m;
 607         priv->accum_statistics.general.ttl_timestamp =
 608                 priv->statistics.general.ttl_timestamp;
 609         priv->accum_statistics.tx.tx_power.ant_a =
 610                 priv->statistics.tx.tx_power.ant_a;
 611         priv->accum_statistics.tx.tx_power.ant_b =
 612                 priv->statistics.tx.tx_power.ant_b;
 613         priv->accum_statistics.tx.tx_power.ant_c =
 614                 priv->statistics.tx.tx_power.ant_c;
 615 }
 616 #endif
 617
 618 #define REG_RECALIB_PERIOD (60)
 619
 620 #define PLCP_MSG "plcp_err exceeded %u, %u, %u, %u, %u, %d, %u mSecs\n"
 621 void iwl_rx_statistics(struct iwl_priv *priv,
 622                               struct iwl_rx_mem_buffer *rxb)
 623 {
 624         int change;
 625         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 626         int combined_plcp_delta;
 627         unsigned int plcp_msec;
 628         unsigned long plcp_received_jiffies;
 629
 630         IWL_DEBUG_RX(priv, "Statistics notification received (%d vs %d).\n",
 631                      (int)sizeof(priv->statistics),
 632                      le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK);
 633
 634         change = ((priv->statistics.general.temperature !=
 635                    pkt->u.stats.general.temperature) ||
 636                   ((priv->statistics.flag &
 637                     STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 638                    (pkt->u.stats.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 639
 640 #ifdef CONFIG_IWLWIFI_DEBUG
 641         iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
 642 #endif
 643         /*
 644          * check for plcp_err and trigger radio reset if it exceeds
 645          * the plcp error threshold plcp_delta.
 646          */
 647         plcp_received_jiffies = jiffies;
 648         plcp_msec = jiffies_to_msecs((long) plcp_received_jiffies -
 649                                         (long) priv->plcp_jiffies);
 650         priv->plcp_jiffies = plcp_received_jiffies;
 651         /*
 652          * check to make sure plcp_msec is not 0 to prevent division
 653          * by zero.
 654          */
 655         if (plcp_msec) {
 656                 combined_plcp_delta =
 657                         (le32_to_cpu(pkt->u.stats.rx.ofdm.plcp_err) -
 658                         le32_to_cpu(priv->statistics.rx.ofdm.plcp_err)) +
 659                         (le32_to_cpu(pkt->u.stats.rx.ofdm_ht.plcp_err) -
 660                         le32_to_cpu(priv->statistics.rx.ofdm_ht.plcp_err));
 661
 662                 if ((combined_plcp_delta > 0) &&
 663                         ((combined_plcp_delta * 100) / plcp_msec) >
 664                         priv->cfg->plcp_delta_threshold) {
 665                         /*
 666                          * if plcp_err exceed the threshold, the following
 667                          * data is printed in csv format:
 668                          *    Text: plcp_err exceeded %d,
 669                          *    Received ofdm.plcp_err,
 670                          *    Current ofdm.plcp_err,
 671                          *    Received ofdm_ht.plcp_err,
 672                          *    Current ofdm_ht.plcp_err,
 673                          *    combined_plcp_delta,
 674                          *    plcp_msec
 675                          */
 676                         IWL_DEBUG_RADIO(priv, PLCP_MSG,
 677                                 priv->cfg->plcp_delta_threshold,
 678                                 le32_to_cpu(pkt->u.stats.rx.ofdm.plcp_err),
 679                                 le32_to_cpu(priv->statistics.rx.ofdm.plcp_err),
 680                                 le32_to_cpu(pkt->u.stats.rx.ofdm_ht.plcp_err),
 681                                 le32_to_cpu(
 682                                         priv->statistics.rx.ofdm_ht.plcp_err),
 683                                 combined_plcp_delta, plcp_msec);
 684
 685                         /*
 686                          * Reset the RF radio due to the high plcp
 687                          * error rate
 688                          */
 689                         iwl_force_reset(priv, IWL_RF_RESET);
 690                 }
 691         }
 692
 693         memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics));
 694
 695         set_bit(STATUS_STATISTICS, &priv->status);
 696
 697         /* Reschedule the statistics timer to occur in
 698          * REG_RECALIB_PERIOD seconds to ensure we get a
 699          * thermal update even if the uCode doesn't give
 700          * us one */
 701         mod_timer(&priv->statistics_periodic, jiffies +
 702                   msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
 703
 704         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 705             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 706                 iwl_rx_calc_noise(priv);
 707                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 708         }
 709         if (priv->cfg->ops->lib->temp_ops.temperature && change)
 710                 priv->cfg->ops->lib->temp_ops.temperature(priv);
 711 }
 712 EXPORT_SYMBOL(iwl_rx_statistics);
 713
 714 void iwl_reply_statistics(struct iwl_priv *priv,
 715                               struct iwl_rx_mem_buffer *rxb)
 716 {
 717         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 718
 719         if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
 720 #ifdef CONFIG_IWLWIFI_DEBUG
 721                 memset(&priv->accum_statistics, 0,
 722                         sizeof(struct iwl_notif_statistics));
 723                 memset(&priv->delta_statistics, 0,
 724                         sizeof(struct iwl_notif_statistics));
 725                 memset(&priv->max_delta, 0,
 726                         sizeof(struct iwl_notif_statistics));
 727 #endif
 728                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 729         }
 730         iwl_rx_statistics(priv, rxb);
 731 }
 732 EXPORT_SYMBOL(iwl_reply_statistics);
 733
 734 /* Calc max signal level (dBm) among 3 possible receivers */
 735 static inline int iwl_calc_rssi(struct iwl_priv *priv,
 736                                 struct iwl_rx_phy_res *rx_resp)
 737 {
 738         return priv->cfg->ops->utils->calc_rssi(priv, rx_resp);
 739 }
 740
 741 #ifdef CONFIG_IWLWIFI_DEBUG
 742 /**
 743  * iwl_dbg_report_frame - dump frame to syslog during debug sessions
 744  *
 745  * You may hack this function to show different aspects of received frames,
 746  * including selective frame dumps.
 747  * group100 parameter selects whether to show 1 out of 100 good data frames.
 748  *    All beacon and probe response frames are printed.
 749  */
 750 static void iwl_dbg_report_frame(struct iwl_priv *priv,
 751                       struct iwl_rx_phy_res *phy_res, u16 length,
 752                       struct ieee80211_hdr *header, int group100)
 753 {
 754         u32 to_us;
 755         u32 print_summary = 0;
 756         u32 print_dump = 0;     /* set to 1 to dump all frames' contents */
 757         u32 hundred = 0;
 758         u32 dataframe = 0;
 759         __le16 fc;
 760         u16 seq_ctl;
 761         u16 channel;
 762         u16 phy_flags;
 763         u32 rate_n_flags;
 764         u32 tsf_low;
 765         int rssi;
 766
 767         if (likely(!(iwl_get_debug_level(priv) & IWL_DL_RX)))
 768                 return;
 769
 770         /* MAC header */
 771         fc = header->frame_control;
 772         seq_ctl = le16_to_cpu(header->seq_ctrl);
 773
 774         /* metadata */
 775         channel = le16_to_cpu(phy_res->channel);
 776         phy_flags = le16_to_cpu(phy_res->phy_flags);
 777         rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
 778
 779         /* signal statistics */
 780         rssi = iwl_calc_rssi(priv, phy_res);
 781         tsf_low = le64_to_cpu(phy_res->timestamp) & 0x0ffffffff;
 782
 783         to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
 784
 785         /* if data frame is to us and all is good,
 786          *   (optionally) print summary for only 1 out of every 100 */
 787         if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
 788             cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
 789                 dataframe = 1;
 790                 if (!group100)
 791                         print_summary = 1;      /* print each frame */
 792                 else if (priv->framecnt_to_us < 100) {
 793                         priv->framecnt_to_us++;
 794                         print_summary = 0;
 795                 } else {
 796                         priv->framecnt_to_us = 0;
 797                         print_summary = 1;
 798                         hundred = 1;
 799                 }
 800         } else {
 801                 /* print summary for all other frames */
 802                 print_summary = 1;
 803         }
 804
 805         if (print_summary) {
 806                 char *title;
 807                 int rate_idx;
 808                 u32 bitrate;
 809
 810                 if (hundred)
 811                         title = "100Frames";
 812                 else if (ieee80211_has_retry(fc))
 813                         title = "Retry";
 814                 else if (ieee80211_is_assoc_resp(fc))
 815                         title = "AscRsp";
 816                 else if (ieee80211_is_reassoc_resp(fc))
 817                         title = "RasRsp";
 818                 else if (ieee80211_is_probe_resp(fc)) {
 819                         title = "PrbRsp";
 820                         print_dump = 1; /* dump frame contents */
 821                 } else if (ieee80211_is_beacon(fc)) {
 822                         title = "Beacon";
 823                         print_dump = 1; /* dump frame contents */
 824                 } else if (ieee80211_is_atim(fc))
 825                         title = "ATIM";
 826                 else if (ieee80211_is_auth(fc))
 827                         title = "Auth";
 828                 else if (ieee80211_is_deauth(fc))
 829                         title = "DeAuth";
 830                 else if (ieee80211_is_disassoc(fc))
 831                         title = "DisAssoc";
 832                 else
 833                         title = "Frame";
 834
 835                 rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 836                 if (unlikely((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT))) {
 837                         bitrate = 0;
 838                         WARN_ON_ONCE(1);
 839                 } else {
 840                         bitrate = iwl_rates[rate_idx].ieee / 2;
 841                 }
 842
 843                 /* print frame summary.
 844                  * MAC addresses show just the last byte (for brevity),
 845                  *    but you can hack it to show more, if you'd like to. */
 846                 if (dataframe)
 847                         IWL_DEBUG_RX(priv, "%s: mhd=0x%04x, dst=0x%02x, "
 848                                      "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
 849                                      title, le16_to_cpu(fc), header->addr1[5],
 850                                      length, rssi, channel, bitrate);
 851                 else {
 852                         /* src/dst addresses assume managed mode */
 853                         IWL_DEBUG_RX(priv, "%s: 0x%04x, dst=0x%02x, src=0x%02x, "
 854                                      "len=%u, rssi=%d, tim=%lu usec, "
 855                                      "phy=0x%02x, chnl=%d\n",
 856                                      title, le16_to_cpu(fc), header->addr1[5],
 857                                      header->addr3[5], length, rssi,
 858                                      tsf_low - priv->scan_start_tsf,
 859                                      phy_flags, channel);
 860                 }
 861         }
 862         if (print_dump)
 863                 iwl_print_hex_dump(priv, IWL_DL_RX, header, length);
 864 }
 865 #endif
 866
 867 /*
 868  * returns non-zero if packet should be dropped
 869  */
 870 int iwl_set_decrypted_flag(struct iwl_priv *priv,
 871                            struct ieee80211_hdr *hdr,
 872                            u32 decrypt_res,
 873                            struct ieee80211_rx_status *stats)
 874 {
 875         u16 fc = le16_to_cpu(hdr->frame_control);
 876
 877         if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
 878                 return 0;
 879
 880         if (!(fc & IEEE80211_FCTL_PROTECTED))
 881                 return 0;
 882
 883         IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
 884         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 885         case RX_RES_STATUS_SEC_TYPE_TKIP:
 886                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 887                  * Decryption will be done in SW. */
 888                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 889                     RX_RES_STATUS_BAD_KEY_TTAK)
 890                         break;
 891
 892         case RX_RES_STATUS_SEC_TYPE_WEP:
 893                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 894                     RX_RES_STATUS_BAD_ICV_MIC) {
 895                         /* bad ICV, the packet is destroyed since the
 896                          * decryption is inplace, drop it */
 897                         IWL_DEBUG_RX(priv, "Packet destroyed\n");
 898                         return -1;
 899                 }
 900         case RX_RES_STATUS_SEC_TYPE_CCMP:
 901                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 902                     RX_RES_STATUS_DECRYPT_OK) {
 903                         IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
 904                         stats->flag |= RX_FLAG_DECRYPTED;
 905                 }
 906                 break;
 907
 908         default:
 909                 break;
 910         }
 911         return 0;
 912 }
 913 EXPORT_SYMBOL(iwl_set_decrypted_flag);
 914
 915 static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
 916 {
 917         u32 decrypt_out = 0;
 918
 919         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
 920                                         RX_RES_STATUS_STATION_FOUND)
 921                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
 922                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
 923
 924         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
 925
 926         /* packet was not encrypted */
 927         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 928                                         RX_RES_STATUS_SEC_TYPE_NONE)
 929                 return decrypt_out;
 930
 931         /* packet was encrypted with unknown alg */
 932         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 933                                         RX_RES_STATUS_SEC_TYPE_ERR)
 934                 return decrypt_out;
 935
 936         /* decryption was not done in HW */
 937         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
 938                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
 939                 return decrypt_out;
 940
 941         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
 942
 943         case RX_RES_STATUS_SEC_TYPE_CCMP:
 944                 /* alg is CCM: check MIC only */
 945                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
 946                         /* Bad MIC */
 947                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 948                 else
 949                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 950
 951                 break;
 952
 953         case RX_RES_STATUS_SEC_TYPE_TKIP:
 954                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
 955                         /* Bad TTAK */
 956                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
 957                         break;
 958                 }
 959                 /* fall through if TTAK OK */
 960         default:
 961                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
 962                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 963                 else
 964                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 965                 break;
 966         };
 967
 968         IWL_DEBUG_RX(priv, "decrypt_in:0x%x  decrypt_out = 0x%x\n",
 969                                         decrypt_in, decrypt_out);
 970
 971         return decrypt_out;
 972 }
 973
 974 static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 975                                         struct ieee80211_hdr *hdr,
 976                                         u16 len,
 977                                         u32 ampdu_status,
 978                                         struct iwl_rx_mem_buffer *rxb,
 979                                         struct ieee80211_rx_status *stats)
 980 {
 981         struct sk_buff *skb;
 982         int ret = 0;
 983         __le16 fc = hdr->frame_control;
 984
 985         /* We only process data packets if the interface is open */
 986         if (unlikely(!priv->is_open)) {
 987                 IWL_DEBUG_DROP_LIMIT(priv,
 988                     "Dropping packet while interface is not open.\n");
 989                 return;
 990         }
 991
 992         /* In case of HW accelerated crypto and bad decryption, drop */
 993         if (!priv->cfg->mod_params->sw_crypto &&
 994             iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
 995                 return;
 996
 997         skb = alloc_skb(IWL_LINK_HDR_MAX * 2, GFP_ATOMIC);
 998         if (!skb) {
 999                 IWL_ERR(priv, "alloc_skb failed\n");
1000                 return;
1001         }
1002
1003         skb_reserve(skb, IWL_LINK_HDR_MAX);
1004         skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
1005
1006         /* mac80211 currently doesn't support paged SKB. Convert it to
1007          * linear SKB for management frame and data frame requires
1008          * software decryption or software defragementation. */
1009         if (ieee80211_is_mgmt(fc) ||
1010             ieee80211_has_protected(fc) ||
1011             ieee80211_has_morefrags(fc) ||
1012             le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG ||
1013             (ieee80211_is_data_qos(fc) &&
1014              *ieee80211_get_qos_ctl(hdr) &
1015              IEEE80211_QOS_CONTROL_A_MSDU_PRESENT))
1016                 ret = skb_linearize(skb);
1017         else
1018                 ret = __pskb_pull_tail(skb, min_t(u16, IWL_LINK_HDR_MAX, len)) ?
1019                          0 : -ENOMEM;
1020
1021         if (ret) {
1022                 kfree_skb(skb);
1023                 goto out;
1024         }
1025
1026         /*
1027          * XXX: We cannot touch the page and its virtual memory (hdr) after
1028          * here. It might have already been freed by the above skb change.
1029          */
1030
1031         iwl_update_stats(priv, false, fc, len);
1032         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
1033
1034         ieee80211_rx(priv->hw, skb);
1035  out:
1036         priv->alloc_rxb_page--;
1037         rxb->page = NULL;
1038 }
1039
1040 /* This is necessary only for a number of statistics, see the caller. */
1041 static int iwl_is_network_packet(struct iwl_priv *priv,
1042                 struct ieee80211_hdr *header)
1043 {
1044         /* Filter incoming packets to determine if they are targeted toward
1045          * this network, discarding packets coming from ourselves */
1046         switch (priv->iw_mode) {
1047         case NL80211_IFTYPE_ADHOC: /* Header: Dest. | Source    | BSSID */
1048                 /* packets to our IBSS update information */
1049                 return !compare_ether_addr(header->addr3, priv->bssid);
1050         case NL80211_IFTYPE_STATION: /* Header: Dest. | AP{BSSID} | Source */
1051                 /* packets to our IBSS update information */
1052                 return !compare_ether_addr(header->addr2, priv->bssid);
1053         default:
1054                 return 1;
1055         }
1056 }
1057
1058 /* Called for REPLY_RX (legacy ABG frames), or
1059  * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
1060 void iwl_rx_reply_rx(struct iwl_priv *priv,
1061                                 struct iwl_rx_mem_buffer *rxb)
1062 {
1063         struct ieee80211_hdr *header;
1064         struct ieee80211_rx_status rx_status;
1065         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1066         struct iwl_rx_phy_res *phy_res;
1067         __le32 rx_pkt_status;
1068         struct iwl4965_rx_mpdu_res_start *amsdu;
1069         u32 len;
1070         u32 ampdu_status;
1071         u32 rate_n_flags;
1072
1073         /**
1074          * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
1075          *      REPLY_RX: physical layer info is in this buffer
1076          *      REPLY_RX_MPDU_CMD: physical layer info was sent in separate
1077          *              command and cached in priv->last_phy_res
1078          *
1079          * Here we set up local variables depending on which command is
1080          * received.
1081          */
1082         if (pkt->hdr.cmd == REPLY_RX) {
1083                 phy_res = (struct iwl_rx_phy_res *)pkt->u.raw;
1084                 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res)
1085                                 + phy_res->cfg_phy_cnt);
1086
1087                 len = le16_to_cpu(phy_res->byte_count);
1088                 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) +
1089                                 phy_res->cfg_phy_cnt + len);
1090                 ampdu_status = le32_to_cpu(rx_pkt_status);
1091         } else {
1092                 if (!priv->last_phy_res[0]) {
1093                         IWL_ERR(priv, "MPDU frame without cached PHY data\n");
1094                         return;
1095                 }
1096                 phy_res = (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
1097                 amsdu = (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
1098                 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu));
1099                 len = le16_to_cpu(amsdu->byte_count);
1100                 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len);
1101                 ampdu_status = iwl_translate_rx_status(priv,
1102                                 le32_to_cpu(rx_pkt_status));
1103         }
1104
1105         if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
1106                 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n",
1107                                 phy_res->cfg_phy_cnt);
1108                 return;
1109         }
1110
1111         if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
1112             !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
1113                 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
1114                                 le32_to_cpu(rx_pkt_status));
1115                 return;
1116         }
1117
1118         /* This will be used in several places later */
1119         rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
1120
1121         /* rx_status carries information about the packet to mac80211 */
1122         rx_status.mactime = le64_to_cpu(phy_res->timestamp);
1123         rx_status.freq =
1124                 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel));
1125         rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
1126                                 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
1127         rx_status.rate_idx =
1128                 iwl_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
1129         rx_status.flag = 0;
1130
1131         /* TSF isn't reliable. In order to allow smooth user experience,
1132          * this W/A doesn't propagate it to the mac80211 */
1133         /*rx_status.flag |= RX_FLAG_TSFT;*/
1134
1135         priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
1136
1137         /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1138         rx_status.signal = iwl_calc_rssi(priv, phy_res);
1139
1140         /* Meaningful noise values are available only from beacon statistics,
1141          *   which are gathered only when associated, and indicate noise
1142          *   only for the associated network channel ...
1143          * Ignore these noise values while scanning (other channels) */
1144         if (iwl_is_associated(priv) &&
1145             !test_bit(STATUS_SCANNING, &priv->status)) {
1146                 rx_status.noise = priv->last_rx_noise;
1147         } else {
1148                 rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1149         }
1150
1151         /* Reset beacon noise level if not associated. */
1152         if (!iwl_is_associated(priv))
1153                 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1154
1155 #ifdef CONFIG_IWLWIFI_DEBUG
1156         /* Set "1" to report good data frames in groups of 100 */
1157         if (unlikely(iwl_get_debug_level(priv) & IWL_DL_RX))
1158                 iwl_dbg_report_frame(priv, phy_res, len, header, 1);
1159 #endif
1160         iwl_dbg_log_rx_data_frame(priv, len, header);
1161         IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, noise %d, TSF %llu\n",
1162                 rx_status.signal, rx_status.noise,
1163                 (unsigned long long)rx_status.mactime);
1164
1165         /*
1166          * "antenna number"
1167          *
1168          * It seems that the antenna field in the phy flags value
1169          * is actually a bit field. This is undefined by radiotap,
1170          * it wants an actual antenna number but I always get "7"
1171          * for most legacy frames I receive indicating that the
1172          * same frame was received on all three RX chains.
1173          *
1174          * I think this field should be removed in favor of a
1175          * new 802.11n radiotap field "RX chains" that is defined
1176          * as a bitmask.
1177          */
1178         rx_status.antenna =
1179                 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
1180                 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
1181
1182         /* set the preamble flag if appropriate */
1183         if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
1184                 rx_status.flag |= RX_FLAG_SHORTPRE;
1185
1186         /* Set up the HT phy flags */
1187         if (rate_n_flags & RATE_MCS_HT_MSK)
1188                 rx_status.flag |= RX_FLAG_HT;
1189         if (rate_n_flags & RATE_MCS_HT40_MSK)
1190                 rx_status.flag |= RX_FLAG_40MHZ;
1191         if (rate_n_flags & RATE_MCS_SGI_MSK)
1192                 rx_status.flag |= RX_FLAG_SHORT_GI;
1193
1194         if (iwl_is_network_packet(priv, header)) {
1195                 priv->last_rx_rssi = rx_status.signal;
1196                 priv->last_beacon_time =  priv->ucode_beacon_time;
1197                 priv->last_tsf = le64_to_cpu(phy_res->timestamp);
1198         }
1199
1200         iwl_pass_packet_to_mac80211(priv, header, len, ampdu_status,
1201                                     rxb, &rx_status);
1202 }
1203 EXPORT_SYMBOL(iwl_rx_reply_rx);
1204
1205 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1206  * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1207 void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
1208                                     struct iwl_rx_mem_buffer *rxb)
1209 {
1210         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1211         priv->last_phy_res[0] = 1;
1212         memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
1213                sizeof(struct iwl_rx_phy_res));
1214 }
1215 EXPORT_SYMBOL(iwl_rx_reply_rx_phy);