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