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
 410 int iwl_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 411 {
 412         u32 rb_size;
 413         const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */
 414         u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
 415
 416         if (!priv->cfg->use_isr_legacy)
 417                 rb_timeout = RX_RB_TIMEOUT;
 418
 419         if (priv->cfg->mod_params->amsdu_size_8K)
 420                 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
 421         else
 422                 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
 423
 424         /* Stop Rx DMA */
 425         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 426
 427         /* Reset driver's Rx queue write index */
 428         iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
 429
 430         /* Tell device where to find RBD circular buffer in DRAM */
 431         iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
 432                            (u32)(rxq->dma_addr >> 8));
 433
 434         /* Tell device where in DRAM to update its Rx status */
 435         iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
 436                            rxq->rb_stts_dma >> 4);
 437
 438         /* Enable Rx DMA
 439          * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
 440          *      the credit mechanism in 5000 HW RX FIFO
 441          * Direct rx interrupts to hosts
 442          * Rx buffer size 4 or 8k
 443          * RB timeout 0x10
 444          * 256 RBDs
 445          */
 446         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
 447                            FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
 448                            FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
 449                            FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
 450                            FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK |
 451                            rb_size|
 452                            (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
 453                            (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
 454
 455         iwl_write32(priv, CSR_INT_COALESCING, 0x40);
 456
 457         return 0;
 458 }
 459
 460 int iwl_rxq_stop(struct iwl_priv *priv)
 461 {
 462
 463         /* stop Rx DMA */
 464         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 465         iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
 466                             FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000);
 467
 468         return 0;
 469 }
 470 EXPORT_SYMBOL(iwl_rxq_stop);
 471
 472 void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
 473                                 struct iwl_rx_mem_buffer *rxb)
 474
 475 {
 476         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
 477         struct iwl_missed_beacon_notif *missed_beacon;
 478
 479         missed_beacon = &pkt->u.missed_beacon;
 480         if (le32_to_cpu(missed_beacon->consequtive_missed_beacons) > 5) {
 481                 IWL_DEBUG_CALIB(priv, "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 482                     le32_to_cpu(missed_beacon->consequtive_missed_beacons),
 483                     le32_to_cpu(missed_beacon->total_missed_becons),
 484                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 485                     le32_to_cpu(missed_beacon->num_expected_beacons));
 486                 if (!test_bit(STATUS_SCANNING, &priv->status))
 487                         iwl_init_sensitivity(priv);
 488         }
 489 }
 490 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif);
 491
 492
 493 /* Calculate noise level, based on measurements during network silence just
 494  *   before arriving beacon.  This measurement can be done only if we know
 495  *   exactly when to expect beacons, therefore only when we're associated. */
 496 static void iwl_rx_calc_noise(struct iwl_priv *priv)
 497 {
 498         struct statistics_rx_non_phy *rx_info
 499                                 = &(priv->statistics.rx.general);
 500         int num_active_rx = 0;
 501         int total_silence = 0;
 502         int bcn_silence_a =
 503                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 504         int bcn_silence_b =
 505                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 506         int bcn_silence_c =
 507                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 508
 509         if (bcn_silence_a) {
 510                 total_silence += bcn_silence_a;
 511                 num_active_rx++;
 512         }
 513         if (bcn_silence_b) {
 514                 total_silence += bcn_silence_b;
 515                 num_active_rx++;
 516         }
 517         if (bcn_silence_c) {
 518                 total_silence += bcn_silence_c;
 519                 num_active_rx++;
 520         }
 521
 522         /* Average among active antennas */
 523         if (num_active_rx)
 524                 priv->last_rx_noise = (total_silence / num_active_rx) - 107;
 525         else
 526                 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 527
 528         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 529                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 530                         priv->last_rx_noise);
 531 }
 532
 533 #define REG_RECALIB_PERIOD (60)
 534
 535 void iwl_rx_statistics(struct iwl_priv *priv,
 536                               struct iwl_rx_mem_buffer *rxb)
 537 {
 538         int change;
 539         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
 540
 541         IWL_DEBUG_RX(priv, "Statistics notification received (%d vs %d).\n",
 542                      (int)sizeof(priv->statistics), pkt->len);
 543
 544         change = ((priv->statistics.general.temperature !=
 545                    pkt->u.stats.general.temperature) ||
 546                   ((priv->statistics.flag &
 547                     STATISTICS_REPLY_FLG_FAT_MODE_MSK) !=
 548                    (pkt->u.stats.flag & STATISTICS_REPLY_FLG_FAT_MODE_MSK)));
 549
 550         memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics));
 551
 552         set_bit(STATUS_STATISTICS, &priv->status);
 553
 554         /* Reschedule the statistics timer to occur in
 555          * REG_RECALIB_PERIOD seconds to ensure we get a
 556          * thermal update even if the uCode doesn't give
 557          * us one */
 558         mod_timer(&priv->statistics_periodic, jiffies +
 559                   msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
 560
 561         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 562             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 563                 iwl_rx_calc_noise(priv);
 564                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 565         }
 566
 567         iwl_leds_background(priv);
 568
 569         if (priv->cfg->ops->lib->temp_ops.temperature && change)
 570                 priv->cfg->ops->lib->temp_ops.temperature(priv);
 571 }
 572 EXPORT_SYMBOL(iwl_rx_statistics);
 573
 574 #define PERFECT_RSSI (-20) /* dBm */
 575 #define WORST_RSSI (-95)   /* dBm */
 576 #define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
 577
 578 /* Calculate an indication of rx signal quality (a percentage, not dBm!).
 579  * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
 580  *   about formulas used below. */
 581 static int iwl_calc_sig_qual(int rssi_dbm, int noise_dbm)
 582 {
 583         int sig_qual;
 584         int degradation = PERFECT_RSSI - rssi_dbm;
 585
 586         /* If we get a noise measurement, use signal-to-noise ratio (SNR)
 587          * as indicator; formula is (signal dbm - noise dbm).
 588          * SNR at or above 40 is a great signal (100%).
 589          * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
 590          * Weakest usable signal is usually 10 - 15 dB SNR. */
 591         if (noise_dbm) {
 592                 if (rssi_dbm - noise_dbm >= 40)
 593                         return 100;
 594                 else if (rssi_dbm < noise_dbm)
 595                         return 0;
 596                 sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2;
 597
 598         /* Else use just the signal level.
 599          * This formula is a least squares fit of data points collected and
 600          *   compared with a reference system that had a percentage (%) display
 601          *   for signal quality. */
 602         } else
 603                 sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation *
 604                             (15 * RSSI_RANGE + 62 * degradation)) /
 605                            (RSSI_RANGE * RSSI_RANGE);
 606
 607         if (sig_qual > 100)
 608                 sig_qual = 100;
 609         else if (sig_qual < 1)
 610                 sig_qual = 0;
 611
 612         return sig_qual;
 613 }
 614
 615 /* Calc max signal level (dBm) among 3 possible receivers */
 616 static inline int iwl_calc_rssi(struct iwl_priv *priv,
 617                                 struct iwl_rx_phy_res *rx_resp)
 618 {
 619         return priv->cfg->ops->utils->calc_rssi(priv, rx_resp);
 620 }
 621
 622 #ifdef CONFIG_IWLWIFI_DEBUG
 623 /**
 624  * iwl_dbg_report_frame - dump frame to syslog during debug sessions
 625  *
 626  * You may hack this function to show different aspects of received frames,
 627  * including selective frame dumps.
 628  * group100 parameter selects whether to show 1 out of 100 good data frames.
 629  *    All beacon and probe response frames are printed.
 630  */
 631 static void iwl_dbg_report_frame(struct iwl_priv *priv,
 632                       struct iwl_rx_phy_res *phy_res, u16 length,
 633                       struct ieee80211_hdr *header, int group100)
 634 {
 635         u32 to_us;
 636         u32 print_summary = 0;
 637         u32 print_dump = 0;     /* set to 1 to dump all frames' contents */
 638         u32 hundred = 0;
 639         u32 dataframe = 0;
 640         __le16 fc;
 641         u16 seq_ctl;
 642         u16 channel;
 643         u16 phy_flags;
 644         u32 rate_n_flags;
 645         u32 tsf_low;
 646         int rssi;
 647
 648         if (likely(!(iwl_debug_level & IWL_DL_RX)))
 649                 return;
 650
 651         /* MAC header */
 652         fc = header->frame_control;
 653         seq_ctl = le16_to_cpu(header->seq_ctrl);
 654
 655         /* metadata */
 656         channel = le16_to_cpu(phy_res->channel);
 657         phy_flags = le16_to_cpu(phy_res->phy_flags);
 658         rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
 659
 660         /* signal statistics */
 661         rssi = iwl_calc_rssi(priv, phy_res);
 662         tsf_low = le64_to_cpu(phy_res->timestamp) & 0x0ffffffff;
 663
 664         to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
 665
 666         /* if data frame is to us and all is good,
 667          *   (optionally) print summary for only 1 out of every 100 */
 668         if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
 669             cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
 670                 dataframe = 1;
 671                 if (!group100)
 672                         print_summary = 1;      /* print each frame */
 673                 else if (priv->framecnt_to_us < 100) {
 674                         priv->framecnt_to_us++;
 675                         print_summary = 0;
 676                 } else {
 677                         priv->framecnt_to_us = 0;
 678                         print_summary = 1;
 679                         hundred = 1;
 680                 }
 681         } else {
 682                 /* print summary for all other frames */
 683                 print_summary = 1;
 684         }
 685
 686         if (print_summary) {
 687                 char *title;
 688                 int rate_idx;
 689                 u32 bitrate;
 690
 691                 if (hundred)
 692                         title = "100Frames";
 693                 else if (ieee80211_has_retry(fc))
 694                         title = "Retry";
 695                 else if (ieee80211_is_assoc_resp(fc))
 696                         title = "AscRsp";
 697                 else if (ieee80211_is_reassoc_resp(fc))
 698                         title = "RasRsp";
 699                 else if (ieee80211_is_probe_resp(fc)) {
 700                         title = "PrbRsp";
 701                         print_dump = 1; /* dump frame contents */
 702                 } else if (ieee80211_is_beacon(fc)) {
 703                         title = "Beacon";
 704                         print_dump = 1; /* dump frame contents */
 705                 } else if (ieee80211_is_atim(fc))
 706                         title = "ATIM";
 707                 else if (ieee80211_is_auth(fc))
 708                         title = "Auth";
 709                 else if (ieee80211_is_deauth(fc))
 710                         title = "DeAuth";
 711                 else if (ieee80211_is_disassoc(fc))
 712                         title = "DisAssoc";
 713                 else
 714                         title = "Frame";
 715
 716                 rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 717                 if (unlikely((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT))) {
 718                         bitrate = 0;
 719                         WARN_ON_ONCE(1);
 720                 } else {
 721                         bitrate = iwl_rates[rate_idx].ieee / 2;
 722                 }
 723
 724                 /* print frame summary.
 725                  * MAC addresses show just the last byte (for brevity),
 726                  *    but you can hack it to show more, if you'd like to. */
 727                 if (dataframe)
 728                         IWL_DEBUG_RX(priv, "%s: mhd=0x%04x, dst=0x%02x, "
 729                                      "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
 730                                      title, le16_to_cpu(fc), header->addr1[5],
 731                                      length, rssi, channel, bitrate);
 732                 else {
 733                         /* src/dst addresses assume managed mode */
 734                         IWL_DEBUG_RX(priv, "%s: 0x%04x, dst=0x%02x, src=0x%02x, "
 735                                      "len=%u, rssi=%d, tim=%lu usec, "
 736                                      "phy=0x%02x, chnl=%d\n",
 737                                      title, le16_to_cpu(fc), header->addr1[5],
 738                                      header->addr3[5], length, rssi,
 739                                      tsf_low - priv->scan_start_tsf,
 740                                      phy_flags, channel);
 741                 }
 742         }
 743         if (print_dump)
 744                 iwl_print_hex_dump(IWL_DL_RX, header, length);
 745 }
 746 #endif
 747
 748 static void iwl_update_rx_stats(struct iwl_priv *priv, u16 fc, u16 len)
 749 {
 750         /* 0 - mgmt, 1 - cnt, 2 - data */
 751         int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2;
 752         priv->rx_stats[idx].cnt++;
 753         priv->rx_stats[idx].bytes += len;
 754 }
 755
 756 /*
 757  * returns non-zero if packet should be dropped
 758  */
 759 int iwl_set_decrypted_flag(struct iwl_priv *priv,
 760                            struct ieee80211_hdr *hdr,
 761                            u32 decrypt_res,
 762                            struct ieee80211_rx_status *stats)
 763 {
 764         u16 fc = le16_to_cpu(hdr->frame_control);
 765
 766         if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
 767                 return 0;
 768
 769         if (!(fc & IEEE80211_FCTL_PROTECTED))
 770                 return 0;
 771
 772         IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
 773         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 774         case RX_RES_STATUS_SEC_TYPE_TKIP:
 775                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 776                  * Decryption will be done in SW. */
 777                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 778                     RX_RES_STATUS_BAD_KEY_TTAK)
 779                         break;
 780
 781         case RX_RES_STATUS_SEC_TYPE_WEP:
 782                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 783                     RX_RES_STATUS_BAD_ICV_MIC) {
 784                         /* bad ICV, the packet is destroyed since the
 785                          * decryption is inplace, drop it */
 786                         IWL_DEBUG_RX(priv, "Packet destroyed\n");
 787                         return -1;
 788                 }
 789         case RX_RES_STATUS_SEC_TYPE_CCMP:
 790                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 791                     RX_RES_STATUS_DECRYPT_OK) {
 792                         IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
 793                         stats->flag |= RX_FLAG_DECRYPTED;
 794                 }
 795                 break;
 796
 797         default:
 798                 break;
 799         }
 800         return 0;
 801 }
 802 EXPORT_SYMBOL(iwl_set_decrypted_flag);
 803
 804 static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
 805 {
 806         u32 decrypt_out = 0;
 807
 808         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
 809                                         RX_RES_STATUS_STATION_FOUND)
 810                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
 811                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
 812
 813         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
 814
 815         /* packet was not encrypted */
 816         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 817                                         RX_RES_STATUS_SEC_TYPE_NONE)
 818                 return decrypt_out;
 819
 820         /* packet was encrypted with unknown alg */
 821         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 822                                         RX_RES_STATUS_SEC_TYPE_ERR)
 823                 return decrypt_out;
 824
 825         /* decryption was not done in HW */
 826         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
 827                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
 828                 return decrypt_out;
 829
 830         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
 831
 832         case RX_RES_STATUS_SEC_TYPE_CCMP:
 833                 /* alg is CCM: check MIC only */
 834                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
 835                         /* Bad MIC */
 836                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 837                 else
 838                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 839
 840                 break;
 841
 842         case RX_RES_STATUS_SEC_TYPE_TKIP:
 843                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
 844                         /* Bad TTAK */
 845                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
 846                         break;
 847                 }
 848                 /* fall through if TTAK OK */
 849         default:
 850                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
 851                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 852                 else
 853                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 854                 break;
 855         };
 856
 857         IWL_DEBUG_RX(priv, "decrypt_in:0x%x  decrypt_out = 0x%x\n",
 858                                         decrypt_in, decrypt_out);
 859
 860         return decrypt_out;
 861 }
 862
 863 static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 864                                        int include_phy,
 865                                        struct iwl_rx_mem_buffer *rxb,
 866                                        struct ieee80211_rx_status *stats)
 867 {
 868         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
 869         struct iwl_rx_phy_res *rx_start = (include_phy) ?
 870             (struct iwl_rx_phy_res *)&(pkt->u.raw[0]) : NULL;
 871         struct ieee80211_hdr *hdr;
 872         u16 len;
 873         __le32 *rx_end;
 874         unsigned int skblen;
 875         u32 ampdu_status;
 876         u32 ampdu_status_legacy;
 877
 878         if (!include_phy && priv->last_phy_res[0])
 879                 rx_start = (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
 880
 881         if (!rx_start) {
 882                 IWL_ERR(priv, "MPDU frame without a PHY data\n");
 883                 return;
 884         }
 885         if (include_phy) {
 886                 hdr = (struct ieee80211_hdr *)((u8 *) &rx_start[1] +
 887                                                rx_start->cfg_phy_cnt);
 888
 889                 len = le16_to_cpu(rx_start->byte_count);
 890
 891                 rx_end = (__le32 *)((u8 *) &pkt->u.raw[0] +
 892                                   sizeof(struct iwl_rx_phy_res) +
 893                                   rx_start->cfg_phy_cnt + len);
 894
 895         } else {
 896                 struct iwl4965_rx_mpdu_res_start *amsdu =
 897                     (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
 898
 899                 hdr = (struct ieee80211_hdr *)(pkt->u.raw +
 900                                sizeof(struct iwl4965_rx_mpdu_res_start));
 901                 len =  le16_to_cpu(amsdu->byte_count);
 902                 rx_start->byte_count = amsdu->byte_count;
 903                 rx_end = (__le32 *) (((u8 *) hdr) + len);
 904         }
 905
 906         ampdu_status = le32_to_cpu(*rx_end);
 907         skblen = ((u8 *) rx_end - (u8 *) &pkt->u.raw[0]) + sizeof(u32);
 908
 909         if (!include_phy) {
 910                 /* New status scheme, need to translate */
 911                 ampdu_status_legacy = ampdu_status;
 912                 ampdu_status = iwl_translate_rx_status(priv, ampdu_status);
 913         }
 914
 915         /* start from MAC */
 916         skb_reserve(rxb->skb, (void *)hdr - (void *)pkt);
 917         skb_put(rxb->skb, len); /* end where data ends */
 918
 919         /* We only process data packets if the interface is open */
 920         if (unlikely(!priv->is_open)) {
 921                 IWL_DEBUG_DROP_LIMIT(priv,
 922                     "Dropping packet while interface is not open.\n");
 923                 return;
 924         }
 925
 926         hdr = (struct ieee80211_hdr *)rxb->skb->data;
 927
 928         /*  in case of HW accelerated crypto and bad decryption, drop */
 929         if (!priv->cfg->mod_params->sw_crypto &&
 930             iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
 931                 return;
 932
 933         iwl_update_rx_stats(priv, le16_to_cpu(hdr->frame_control), len);
 934         memcpy(IEEE80211_SKB_RXCB(rxb->skb), stats, sizeof(*stats));
 935         ieee80211_rx_irqsafe(priv->hw, rxb->skb);
 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(iwl_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.qual,
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);