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_DEBUG_INFO(priv, "Rx queue requesting wakeup, GP1 = 0x%x\n",
 144                                       reg);
 145                         iwl_set_bit(priv, CSR_GP_CNTRL,
 146                                     CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 147                         goto exit_unlock;
 148                 }
 149
 150                 q->write_actual = (q->write & ~0x7);
 151                 iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual);
 152
 153         /* Else device is assumed to be awake */
 154         } else {
 155                 /* Device expects a multiple of 8 */
 156                 q->write_actual = (q->write & ~0x7);
 157                 iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual);
 158         }
 159
 160         q->need_update = 0;
 161
 162  exit_unlock:
 163         spin_unlock_irqrestore(&q->lock, flags);
 164         return ret;
 165 }
 166 EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr);
 167 /**
 168  * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
 169  */
 170 static inline __le32 iwl_dma_addr2rbd_ptr(struct iwl_priv *priv,
 171                                           dma_addr_t dma_addr)
 172 {
 173         return cpu_to_le32((u32)(dma_addr >> 8));
 174 }
 175
 176 /**
 177  * iwl_rx_queue_restock - refill RX queue from pre-allocated pool
 178  *
 179  * If there are slots in the RX queue that need to be restocked,
 180  * and we have free pre-allocated buffers, fill the ranks as much
 181  * as we can, pulling from rx_free.
 182  *
 183  * This moves the 'write' index forward to catch up with 'processed', and
 184  * also updates the memory address in the firmware to reference the new
 185  * target buffer.
 186  */
 187 int iwl_rx_queue_restock(struct iwl_priv *priv)
 188 {
 189         struct iwl_rx_queue *rxq = &priv->rxq;
 190         struct list_head *element;
 191         struct iwl_rx_mem_buffer *rxb;
 192         unsigned long flags;
 193         int write;
 194         int ret = 0;
 195
 196         spin_lock_irqsave(&rxq->lock, flags);
 197         write = rxq->write & ~0x7;
 198         while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
 199                 /* Get next free Rx buffer, remove from free list */
 200                 element = rxq->rx_free.next;
 201                 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
 202                 list_del(element);
 203
 204                 /* Point to Rx buffer via next RBD in circular buffer */
 205                 rxq->bd[rxq->write] = iwl_dma_addr2rbd_ptr(priv, rxb->page_dma);
 206                 rxq->queue[rxq->write] = rxb;
 207                 rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
 208                 rxq->free_count--;
 209         }
 210         spin_unlock_irqrestore(&rxq->lock, flags);
 211         /* If the pre-allocated buffer pool is dropping low, schedule to
 212          * refill it */
 213         if (rxq->free_count <= RX_LOW_WATERMARK)
 214                 queue_work(priv->workqueue, &priv->rx_replenish);
 215
 216
 217         /* If we've added more space for the firmware to place data, tell it.
 218          * Increment device's write pointer in multiples of 8. */
 219         if (rxq->write_actual != (rxq->write & ~0x7)) {
 220                 spin_lock_irqsave(&rxq->lock, flags);
 221                 rxq->need_update = 1;
 222                 spin_unlock_irqrestore(&rxq->lock, flags);
 223                 ret = iwl_rx_queue_update_write_ptr(priv, rxq);
 224         }
 225
 226         return ret;
 227 }
 228 EXPORT_SYMBOL(iwl_rx_queue_restock);
 229
 230
 231 /**
 232  * iwl_rx_replenish - Move all used packet from rx_used to rx_free
 233  *
 234  * When moving to rx_free an SKB is allocated for the slot.
 235  *
 236  * Also restock the Rx queue via iwl_rx_queue_restock.
 237  * This is called as a scheduled work item (except for during initialization)
 238  */
 239 void iwl_rx_allocate(struct iwl_priv *priv, gfp_t priority)
 240 {
 241         struct iwl_rx_queue *rxq = &priv->rxq;
 242         struct list_head *element;
 243         struct iwl_rx_mem_buffer *rxb;
 244         struct page *page;
 245         unsigned long flags;
 246         gfp_t gfp_mask = priority;
 247
 248         while (1) {
 249                 spin_lock_irqsave(&rxq->lock, flags);
 250                 if (list_empty(&rxq->rx_used)) {
 251                         spin_unlock_irqrestore(&rxq->lock, flags);
 252                         return;
 253                 }
 254                 spin_unlock_irqrestore(&rxq->lock, flags);
 255
 256                 if (rxq->free_count > RX_LOW_WATERMARK)
 257                         gfp_mask |= __GFP_NOWARN;
 258
 259                 if (priv->hw_params.rx_page_order > 0)
 260                         gfp_mask |= __GFP_COMP;
 261
 262                 /* Alloc a new receive buffer */
 263                 page = alloc_pages(gfp_mask, priv->hw_params.rx_page_order);
 264                 if (!page) {
 265                         if (net_ratelimit())
 266                                 IWL_DEBUG_INFO(priv, "alloc_pages failed, "
 267                                                "order: %d\n",
 268                                                priv->hw_params.rx_page_order);
 269
 270                         if ((rxq->free_count <= RX_LOW_WATERMARK) &&
 271                             net_ratelimit())
 272                                 IWL_CRIT(priv, "Failed to alloc_pages with %s. Only %u free buffers remaining.\n",
 273                                          priority == GFP_ATOMIC ?  "GFP_ATOMIC" : "GFP_KERNEL",
 274                                          rxq->free_count);
 275                         /* We don't reschedule replenish work here -- we will
 276                          * call the restock method and if it still needs
 277                          * more buffers it will schedule replenish */
 278                         return;
 279                 }
 280
 281                 spin_lock_irqsave(&rxq->lock, flags);
 282
 283                 if (list_empty(&rxq->rx_used)) {
 284                         spin_unlock_irqrestore(&rxq->lock, flags);
 285                         __free_pages(page, priv->hw_params.rx_page_order);
 286                         return;
 287                 }
 288                 element = rxq->rx_used.next;
 289                 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
 290                 list_del(element);
 291
 292                 spin_unlock_irqrestore(&rxq->lock, flags);
 293
 294                 rxb->page = page;
 295                 /* Get physical address of the RB */
 296                 rxb->page_dma = pci_map_page(priv->pci_dev, page, 0,
 297                                 PAGE_SIZE << priv->hw_params.rx_page_order,
 298                                 PCI_DMA_FROMDEVICE);
 299                 /* dma address must be no more than 36 bits */
 300                 BUG_ON(rxb->page_dma & ~DMA_BIT_MASK(36));
 301                 /* and also 256 byte aligned! */
 302                 BUG_ON(rxb->page_dma & DMA_BIT_MASK(8));
 303
 304                 spin_lock_irqsave(&rxq->lock, flags);
 305
 306                 list_add_tail(&rxb->list, &rxq->rx_free);
 307                 rxq->free_count++;
 308                 priv->alloc_rxb_page++;
 309
 310                 spin_unlock_irqrestore(&rxq->lock, flags);
 311         }
 312 }
 313
 314 void iwl_rx_replenish(struct iwl_priv *priv)
 315 {
 316         unsigned long flags;
 317
 318         iwl_rx_allocate(priv, GFP_KERNEL);
 319
 320         spin_lock_irqsave(&priv->lock, flags);
 321         iwl_rx_queue_restock(priv);
 322         spin_unlock_irqrestore(&priv->lock, flags);
 323 }
 324 EXPORT_SYMBOL(iwl_rx_replenish);
 325
 326 void iwl_rx_replenish_now(struct iwl_priv *priv)
 327 {
 328         iwl_rx_allocate(priv, GFP_ATOMIC);
 329
 330         iwl_rx_queue_restock(priv);
 331 }
 332 EXPORT_SYMBOL(iwl_rx_replenish_now);
 333
 334
 335 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
 336  * If an SKB has been detached, the POOL needs to have its SKB set to NULL
 337  * This free routine walks the list of POOL entries and if SKB is set to
 338  * non NULL it is unmapped and freed
 339  */
 340 void iwl_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 341 {
 342         int i;
 343         for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
 344                 if (rxq->pool[i].page != NULL) {
 345                         pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
 346                                 PAGE_SIZE << priv->hw_params.rx_page_order,
 347                                 PCI_DMA_FROMDEVICE);
 348                         __free_pages(rxq->pool[i].page,
 349                                      priv->hw_params.rx_page_order);
 350                         rxq->pool[i].page = NULL;
 351                         priv->alloc_rxb_page--;
 352                 }
 353         }
 354
 355         pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
 356                             rxq->dma_addr);
 357         pci_free_consistent(priv->pci_dev, sizeof(struct iwl_rb_status),
 358                             rxq->rb_stts, rxq->rb_stts_dma);
 359         rxq->bd = NULL;
 360         rxq->rb_stts  = NULL;
 361 }
 362 EXPORT_SYMBOL(iwl_rx_queue_free);
 363
 364 int iwl_rx_queue_alloc(struct iwl_priv *priv)
 365 {
 366         struct iwl_rx_queue *rxq = &priv->rxq;
 367         struct pci_dev *dev = priv->pci_dev;
 368         int i;
 369
 370         spin_lock_init(&rxq->lock);
 371         INIT_LIST_HEAD(&rxq->rx_free);
 372         INIT_LIST_HEAD(&rxq->rx_used);
 373
 374         /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
 375         rxq->bd = pci_alloc_consistent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr);
 376         if (!rxq->bd)
 377                 goto err_bd;
 378
 379         rxq->rb_stts = pci_alloc_consistent(dev, sizeof(struct iwl_rb_status),
 380                                         &rxq->rb_stts_dma);
 381         if (!rxq->rb_stts)
 382                 goto err_rb;
 383
 384         /* Fill the rx_used queue with _all_ of the Rx buffers */
 385         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
 386                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 387
 388         /* Set us so that we have processed and used all buffers, but have
 389          * not restocked the Rx queue with fresh buffers */
 390         rxq->read = rxq->write = 0;
 391         rxq->write_actual = 0;
 392         rxq->free_count = 0;
 393         rxq->need_update = 0;
 394         return 0;
 395
 396 err_rb:
 397         pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
 398                             rxq->dma_addr);
 399 err_bd:
 400         return -ENOMEM;
 401 }
 402 EXPORT_SYMBOL(iwl_rx_queue_alloc);
 403
 404 void iwl_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 405 {
 406         unsigned long flags;
 407         int i;
 408         spin_lock_irqsave(&rxq->lock, flags);
 409         INIT_LIST_HEAD(&rxq->rx_free);
 410         INIT_LIST_HEAD(&rxq->rx_used);
 411         /* Fill the rx_used queue with _all_ of the Rx buffers */
 412         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
 413                 /* In the reset function, these buffers may have been allocated
 414                  * to an SKB, so we need to unmap and free potential storage */
 415                 if (rxq->pool[i].page != NULL) {
 416                         pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
 417                                 PAGE_SIZE << priv->hw_params.rx_page_order,
 418                                 PCI_DMA_FROMDEVICE);
 419                         priv->alloc_rxb_page--;
 420                         __free_pages(rxq->pool[i].page,
 421                                      priv->hw_params.rx_page_order);
 422                         rxq->pool[i].page = NULL;
 423                 }
 424                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 425         }
 426
 427         /* Set us so that we have processed and used all buffers, but have
 428          * not restocked the Rx queue with fresh buffers */
 429         rxq->read = rxq->write = 0;
 430         rxq->write_actual = 0;
 431         rxq->free_count = 0;
 432         spin_unlock_irqrestore(&rxq->lock, flags);
 433 }
 434
 435 int iwl_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 436 {
 437         u32 rb_size;
 438         const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */
 439         u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
 440
 441         if (!priv->cfg->use_isr_legacy)
 442                 rb_timeout = RX_RB_TIMEOUT;
 443
 444         if (priv->cfg->mod_params->amsdu_size_8K)
 445                 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
 446         else
 447                 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
 448
 449         /* Stop Rx DMA */
 450         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 451
 452         /* Reset driver's Rx queue write index */
 453         iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
 454
 455         /* Tell device where to find RBD circular buffer in DRAM */
 456         iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
 457                            (u32)(rxq->dma_addr >> 8));
 458
 459         /* Tell device where in DRAM to update its Rx status */
 460         iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
 461                            rxq->rb_stts_dma >> 4);
 462
 463         /* Enable Rx DMA
 464          * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
 465          *      the credit mechanism in 5000 HW RX FIFO
 466          * Direct rx interrupts to hosts
 467          * Rx buffer size 4 or 8k
 468          * RB timeout 0x10
 469          * 256 RBDs
 470          */
 471         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
 472                            FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
 473                            FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
 474                            FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
 475                            FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK |
 476                            rb_size|
 477                            (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
 478                            (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
 479
 480         iwl_write32(priv, CSR_INT_COALESCING, 0x40);
 481
 482         return 0;
 483 }
 484
 485 int iwl_rxq_stop(struct iwl_priv *priv)
 486 {
 487
 488         /* stop Rx DMA */
 489         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 490         iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
 491                             FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000);
 492
 493         return 0;
 494 }
 495 EXPORT_SYMBOL(iwl_rxq_stop);
 496
 497 void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
 498                                 struct iwl_rx_mem_buffer *rxb)
 499
 500 {
 501         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 502         struct iwl_missed_beacon_notif *missed_beacon;
 503
 504         missed_beacon = &pkt->u.missed_beacon;
 505         if (le32_to_cpu(missed_beacon->consequtive_missed_beacons) > 5) {
 506                 IWL_DEBUG_CALIB(priv, "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 507                     le32_to_cpu(missed_beacon->consequtive_missed_beacons),
 508                     le32_to_cpu(missed_beacon->total_missed_becons),
 509                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 510                     le32_to_cpu(missed_beacon->num_expected_beacons));
 511                 if (!test_bit(STATUS_SCANNING, &priv->status))
 512                         iwl_init_sensitivity(priv);
 513         }
 514 }
 515 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif);
 516
 517
 518 /* Calculate noise level, based on measurements during network silence just
 519  *   before arriving beacon.  This measurement can be done only if we know
 520  *   exactly when to expect beacons, therefore only when we're associated. */
 521 static void iwl_rx_calc_noise(struct iwl_priv *priv)
 522 {
 523         struct statistics_rx_non_phy *rx_info
 524                                 = &(priv->statistics.rx.general);
 525         int num_active_rx = 0;
 526         int total_silence = 0;
 527         int bcn_silence_a =
 528                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 529         int bcn_silence_b =
 530                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 531         int bcn_silence_c =
 532                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 533
 534         if (bcn_silence_a) {
 535                 total_silence += bcn_silence_a;
 536                 num_active_rx++;
 537         }
 538         if (bcn_silence_b) {
 539                 total_silence += bcn_silence_b;
 540                 num_active_rx++;
 541         }
 542         if (bcn_silence_c) {
 543                 total_silence += bcn_silence_c;
 544                 num_active_rx++;
 545         }
 546
 547         /* Average among active antennas */
 548         if (num_active_rx)
 549                 priv->last_rx_noise = (total_silence / num_active_rx) - 107;
 550         else
 551                 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 552
 553         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 554                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 555                         priv->last_rx_noise);
 556 }
 557
 558 #ifdef CONFIG_IWLWIFI_DEBUG
 559 /*
 560  *  based on the assumption of all statistics counter are in DWORD
 561  *  FIXME: This function is for debugging, do not deal with
 562  *  the case of counters roll-over.
 563  */
 564 static void iwl_accumulative_statistics(struct iwl_priv *priv,
 565                                         __le32 *stats)
 566 {
 567         int i;
 568         __le32 *prev_stats;
 569         u32 *accum_stats;
 570
 571         prev_stats = (__le32 *)&priv->statistics;
 572         accum_stats = (u32 *)&priv->accum_statistics;
 573
 574         for (i = sizeof(__le32); i < sizeof(struct iwl_notif_statistics);
 575              i += sizeof(__le32), stats++, prev_stats++, accum_stats++)
 576                 if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats))
 577                         *accum_stats += (le32_to_cpu(*stats) -
 578                                 le32_to_cpu(*prev_stats));
 579
 580         /* reset accumulative statistics for "no-counter" type statistics */
 581         priv->accum_statistics.general.temperature =
 582                 priv->statistics.general.temperature;
 583         priv->accum_statistics.general.temperature_m =
 584                 priv->statistics.general.temperature_m;
 585         priv->accum_statistics.general.ttl_timestamp =
 586                 priv->statistics.general.ttl_timestamp;
 587         priv->accum_statistics.tx.tx_power.ant_a =
 588                 priv->statistics.tx.tx_power.ant_a;
 589         priv->accum_statistics.tx.tx_power.ant_b =
 590                 priv->statistics.tx.tx_power.ant_b;
 591         priv->accum_statistics.tx.tx_power.ant_c =
 592                 priv->statistics.tx.tx_power.ant_c;
 593 }
 594 #endif
 595
 596 #define REG_RECALIB_PERIOD (60)
 597
 598 void iwl_rx_statistics(struct iwl_priv *priv,
 599                               struct iwl_rx_mem_buffer *rxb)
 600 {
 601         int change;
 602         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 603
 604         IWL_DEBUG_RX(priv, "Statistics notification received (%d vs %d).\n",
 605                      (int)sizeof(priv->statistics),
 606                      le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK);
 607
 608         change = ((priv->statistics.general.temperature !=
 609                    pkt->u.stats.general.temperature) ||
 610                   ((priv->statistics.flag &
 611                     STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 612                    (pkt->u.stats.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 613
 614 #ifdef CONFIG_IWLWIFI_DEBUG
 615         iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
 616 #endif
 617         memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics));
 618
 619         set_bit(STATUS_STATISTICS, &priv->status);
 620
 621         /* Reschedule the statistics timer to occur in
 622          * REG_RECALIB_PERIOD seconds to ensure we get a
 623          * thermal update even if the uCode doesn't give
 624          * us one */
 625         mod_timer(&priv->statistics_periodic, jiffies +
 626                   msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
 627
 628         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 629             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 630                 iwl_rx_calc_noise(priv);
 631                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 632         }
 633         if (priv->cfg->ops->lib->temp_ops.temperature && change)
 634                 priv->cfg->ops->lib->temp_ops.temperature(priv);
 635 }
 636 EXPORT_SYMBOL(iwl_rx_statistics);
 637
 638 void iwl_reply_statistics(struct iwl_priv *priv,
 639                               struct iwl_rx_mem_buffer *rxb)
 640 {
 641         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 642
 643         if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
 644                 memset(&priv->statistics, 0,
 645                         sizeof(struct iwl_notif_statistics));
 646 #ifdef CONFIG_IWLWIFI_DEBUG
 647                 memset(&priv->accum_statistics, 0,
 648                         sizeof(struct iwl_notif_statistics));
 649 #endif
 650                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 651         }
 652         iwl_rx_statistics(priv, rxb);
 653 }
 654 EXPORT_SYMBOL(iwl_reply_statistics);
 655
 656 #define PERFECT_RSSI (-20) /* dBm */
 657 #define WORST_RSSI (-95)   /* dBm */
 658 #define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
 659
 660 /* Calculate an indication of rx signal quality (a percentage, not dBm!).
 661  * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
 662  *   about formulas used below. */
 663 static int iwl_calc_sig_qual(int rssi_dbm, int noise_dbm)
 664 {
 665         int sig_qual;
 666         int degradation = PERFECT_RSSI - rssi_dbm;
 667
 668         /* If we get a noise measurement, use signal-to-noise ratio (SNR)
 669          * as indicator; formula is (signal dbm - noise dbm).
 670          * SNR at or above 40 is a great signal (100%).
 671          * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
 672          * Weakest usable signal is usually 10 - 15 dB SNR. */
 673         if (noise_dbm) {
 674                 if (rssi_dbm - noise_dbm >= 40)
 675                         return 100;
 676                 else if (rssi_dbm < noise_dbm)
 677                         return 0;
 678                 sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2;
 679
 680         /* Else use just the signal level.
 681          * This formula is a least squares fit of data points collected and
 682          *   compared with a reference system that had a percentage (%) display
 683          *   for signal quality. */
 684         } else
 685                 sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation *
 686                             (15 * RSSI_RANGE + 62 * degradation)) /
 687                            (RSSI_RANGE * RSSI_RANGE);
 688
 689         if (sig_qual > 100)
 690                 sig_qual = 100;
 691         else if (sig_qual < 1)
 692                 sig_qual = 0;
 693
 694         return sig_qual;
 695 }
 696
 697 /* Calc max signal level (dBm) among 3 possible receivers */
 698 static inline int iwl_calc_rssi(struct iwl_priv *priv,
 699                                 struct iwl_rx_phy_res *rx_resp)
 700 {
 701         return priv->cfg->ops->utils->calc_rssi(priv, rx_resp);
 702 }
 703
 704 #ifdef CONFIG_IWLWIFI_DEBUG
 705 /**
 706  * iwl_dbg_report_frame - dump frame to syslog during debug sessions
 707  *
 708  * You may hack this function to show different aspects of received frames,
 709  * including selective frame dumps.
 710  * group100 parameter selects whether to show 1 out of 100 good data frames.
 711  *    All beacon and probe response frames are printed.
 712  */
 713 static void iwl_dbg_report_frame(struct iwl_priv *priv,
 714                       struct iwl_rx_phy_res *phy_res, u16 length,
 715                       struct ieee80211_hdr *header, int group100)
 716 {
 717         u32 to_us;
 718         u32 print_summary = 0;
 719         u32 print_dump = 0;     /* set to 1 to dump all frames' contents */
 720         u32 hundred = 0;
 721         u32 dataframe = 0;
 722         __le16 fc;
 723         u16 seq_ctl;
 724         u16 channel;
 725         u16 phy_flags;
 726         u32 rate_n_flags;
 727         u32 tsf_low;
 728         int rssi;
 729
 730         if (likely(!(iwl_get_debug_level(priv) & IWL_DL_RX)))
 731                 return;
 732
 733         /* MAC header */
 734         fc = header->frame_control;
 735         seq_ctl = le16_to_cpu(header->seq_ctrl);
 736
 737         /* metadata */
 738         channel = le16_to_cpu(phy_res->channel);
 739         phy_flags = le16_to_cpu(phy_res->phy_flags);
 740         rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
 741
 742         /* signal statistics */
 743         rssi = iwl_calc_rssi(priv, phy_res);
 744         tsf_low = le64_to_cpu(phy_res->timestamp) & 0x0ffffffff;
 745
 746         to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
 747
 748         /* if data frame is to us and all is good,
 749          *   (optionally) print summary for only 1 out of every 100 */
 750         if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
 751             cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
 752                 dataframe = 1;
 753                 if (!group100)
 754                         print_summary = 1;      /* print each frame */
 755                 else if (priv->framecnt_to_us < 100) {
 756                         priv->framecnt_to_us++;
 757                         print_summary = 0;
 758                 } else {
 759                         priv->framecnt_to_us = 0;
 760                         print_summary = 1;
 761                         hundred = 1;
 762                 }
 763         } else {
 764                 /* print summary for all other frames */
 765                 print_summary = 1;
 766         }
 767
 768         if (print_summary) {
 769                 char *title;
 770                 int rate_idx;
 771                 u32 bitrate;
 772
 773                 if (hundred)
 774                         title = "100Frames";
 775                 else if (ieee80211_has_retry(fc))
 776                         title = "Retry";
 777                 else if (ieee80211_is_assoc_resp(fc))
 778                         title = "AscRsp";
 779                 else if (ieee80211_is_reassoc_resp(fc))
 780                         title = "RasRsp";
 781                 else if (ieee80211_is_probe_resp(fc)) {
 782                         title = "PrbRsp";
 783                         print_dump = 1; /* dump frame contents */
 784                 } else if (ieee80211_is_beacon(fc)) {
 785                         title = "Beacon";
 786                         print_dump = 1; /* dump frame contents */
 787                 } else if (ieee80211_is_atim(fc))
 788                         title = "ATIM";
 789                 else if (ieee80211_is_auth(fc))
 790                         title = "Auth";
 791                 else if (ieee80211_is_deauth(fc))
 792                         title = "DeAuth";
 793                 else if (ieee80211_is_disassoc(fc))
 794                         title = "DisAssoc";
 795                 else
 796                         title = "Frame";
 797
 798                 rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 799                 if (unlikely((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT))) {
 800                         bitrate = 0;
 801                         WARN_ON_ONCE(1);
 802                 } else {
 803                         bitrate = iwl_rates[rate_idx].ieee / 2;
 804                 }
 805
 806                 /* print frame summary.
 807                  * MAC addresses show just the last byte (for brevity),
 808                  *    but you can hack it to show more, if you'd like to. */
 809                 if (dataframe)
 810                         IWL_DEBUG_RX(priv, "%s: mhd=0x%04x, dst=0x%02x, "
 811                                      "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
 812                                      title, le16_to_cpu(fc), header->addr1[5],
 813                                      length, rssi, channel, bitrate);
 814                 else {
 815                         /* src/dst addresses assume managed mode */
 816                         IWL_DEBUG_RX(priv, "%s: 0x%04x, dst=0x%02x, src=0x%02x, "
 817                                      "len=%u, rssi=%d, tim=%lu usec, "
 818                                      "phy=0x%02x, chnl=%d\n",
 819                                      title, le16_to_cpu(fc), header->addr1[5],
 820                                      header->addr3[5], length, rssi,
 821                                      tsf_low - priv->scan_start_tsf,
 822                                      phy_flags, channel);
 823                 }
 824         }
 825         if (print_dump)
 826                 iwl_print_hex_dump(priv, IWL_DL_RX, header, length);
 827 }
 828 #endif
 829
 830 /*
 831  * returns non-zero if packet should be dropped
 832  */
 833 int iwl_set_decrypted_flag(struct iwl_priv *priv,
 834                            struct ieee80211_hdr *hdr,
 835                            u32 decrypt_res,
 836                            struct ieee80211_rx_status *stats)
 837 {
 838         u16 fc = le16_to_cpu(hdr->frame_control);
 839
 840         if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
 841                 return 0;
 842
 843         if (!(fc & IEEE80211_FCTL_PROTECTED))
 844                 return 0;
 845
 846         IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
 847         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 848         case RX_RES_STATUS_SEC_TYPE_TKIP:
 849                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 850                  * Decryption will be done in SW. */
 851                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 852                     RX_RES_STATUS_BAD_KEY_TTAK)
 853                         break;
 854
 855         case RX_RES_STATUS_SEC_TYPE_WEP:
 856                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 857                     RX_RES_STATUS_BAD_ICV_MIC) {
 858                         /* bad ICV, the packet is destroyed since the
 859                          * decryption is inplace, drop it */
 860                         IWL_DEBUG_RX(priv, "Packet destroyed\n");
 861                         return -1;
 862                 }
 863         case RX_RES_STATUS_SEC_TYPE_CCMP:
 864                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 865                     RX_RES_STATUS_DECRYPT_OK) {
 866                         IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
 867                         stats->flag |= RX_FLAG_DECRYPTED;
 868                 }
 869                 break;
 870
 871         default:
 872                 break;
 873         }
 874         return 0;
 875 }
 876 EXPORT_SYMBOL(iwl_set_decrypted_flag);
 877
 878 static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
 879 {
 880         u32 decrypt_out = 0;
 881
 882         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
 883                                         RX_RES_STATUS_STATION_FOUND)
 884                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
 885                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
 886
 887         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
 888
 889         /* packet was not encrypted */
 890         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 891                                         RX_RES_STATUS_SEC_TYPE_NONE)
 892                 return decrypt_out;
 893
 894         /* packet was encrypted with unknown alg */
 895         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 896                                         RX_RES_STATUS_SEC_TYPE_ERR)
 897                 return decrypt_out;
 898
 899         /* decryption was not done in HW */
 900         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
 901                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
 902                 return decrypt_out;
 903
 904         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
 905
 906         case RX_RES_STATUS_SEC_TYPE_CCMP:
 907                 /* alg is CCM: check MIC only */
 908                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
 909                         /* Bad MIC */
 910                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 911                 else
 912                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 913
 914                 break;
 915
 916         case RX_RES_STATUS_SEC_TYPE_TKIP:
 917                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
 918                         /* Bad TTAK */
 919                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
 920                         break;
 921                 }
 922                 /* fall through if TTAK OK */
 923         default:
 924                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
 925                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 926                 else
 927                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 928                 break;
 929         };
 930
 931         IWL_DEBUG_RX(priv, "decrypt_in:0x%x  decrypt_out = 0x%x\n",
 932                                         decrypt_in, decrypt_out);
 933
 934         return decrypt_out;
 935 }
 936
 937 static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 938                                         struct ieee80211_hdr *hdr,
 939                                         u16 len,
 940                                         u32 ampdu_status,
 941                                         struct iwl_rx_mem_buffer *rxb,
 942                                         struct ieee80211_rx_status *stats)
 943 {
 944         struct sk_buff *skb;
 945         int ret = 0;
 946         __le16 fc = hdr->frame_control;
 947
 948         /* We only process data packets if the interface is open */
 949         if (unlikely(!priv->is_open)) {
 950                 IWL_DEBUG_DROP_LIMIT(priv,
 951                     "Dropping packet while interface is not open.\n");
 952                 return;
 953         }
 954
 955         /* In case of HW accelerated crypto and bad decryption, drop */
 956         if (!priv->cfg->mod_params->sw_crypto &&
 957             iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
 958                 return;
 959
 960         skb = alloc_skb(IWL_LINK_HDR_MAX * 2, GFP_ATOMIC);
 961         if (!skb) {
 962                 IWL_ERR(priv, "alloc_skb failed\n");
 963                 return;
 964         }
 965
 966         skb_reserve(skb, IWL_LINK_HDR_MAX);
 967         skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
 968
 969         /* mac80211 currently doesn't support paged SKB. Convert it to
 970          * linear SKB for management frame and data frame requires
 971          * software decryption or software defragementation. */
 972         if (ieee80211_is_mgmt(fc) ||
 973             ieee80211_has_protected(fc) ||
 974             ieee80211_has_morefrags(fc) ||
 975             le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)
 976                 ret = skb_linearize(skb);
 977         else
 978                 ret = __pskb_pull_tail(skb, min_t(u16, IWL_LINK_HDR_MAX, len)) ?
 979                          0 : -ENOMEM;
 980
 981         if (ret) {
 982                 kfree_skb(skb);
 983                 goto out;
 984         }
 985
 986         /*
 987          * XXX: We cannot touch the page and its virtual memory (hdr) after
 988          * here. It might have already been freed by the above skb change.
 989          */
 990
 991         iwl_update_stats(priv, false, fc, len);
 992         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
 993
 994         ieee80211_rx(priv->hw, skb);
 995  out:
 996         priv->alloc_rxb_page--;
 997         rxb->page = NULL;
 998 }
 999
1000 /* This is necessary only for a number of statistics, see the caller. */
1001 static int iwl_is_network_packet(struct iwl_priv *priv,
1002                 struct ieee80211_hdr *header)
1003 {
1004         /* Filter incoming packets to determine if they are targeted toward
1005          * this network, discarding packets coming from ourselves */
1006         switch (priv->iw_mode) {
1007         case NL80211_IFTYPE_ADHOC: /* Header: Dest. | Source    | BSSID */
1008                 /* packets to our IBSS update information */
1009                 return !compare_ether_addr(header->addr3, priv->bssid);
1010         case NL80211_IFTYPE_STATION: /* Header: Dest. | AP{BSSID} | Source */
1011                 /* packets to our IBSS update information */
1012                 return !compare_ether_addr(header->addr2, priv->bssid);
1013         default:
1014                 return 1;
1015         }
1016 }
1017
1018 /* Called for REPLY_RX (legacy ABG frames), or
1019  * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
1020 void iwl_rx_reply_rx(struct iwl_priv *priv,
1021                                 struct iwl_rx_mem_buffer *rxb)
1022 {
1023         struct ieee80211_hdr *header;
1024         struct ieee80211_rx_status rx_status;
1025         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1026         struct iwl_rx_phy_res *phy_res;
1027         __le32 rx_pkt_status;
1028         struct iwl4965_rx_mpdu_res_start *amsdu;
1029         u32 len;
1030         u32 ampdu_status;
1031         u32 rate_n_flags;
1032
1033         /**
1034          * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
1035          *      REPLY_RX: physical layer info is in this buffer
1036          *      REPLY_RX_MPDU_CMD: physical layer info was sent in separate
1037          *              command and cached in priv->last_phy_res
1038          *
1039          * Here we set up local variables depending on which command is
1040          * received.
1041          */
1042         if (pkt->hdr.cmd == REPLY_RX) {
1043                 phy_res = (struct iwl_rx_phy_res *)pkt->u.raw;
1044                 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res)
1045                                 + phy_res->cfg_phy_cnt);
1046
1047                 len = le16_to_cpu(phy_res->byte_count);
1048                 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) +
1049                                 phy_res->cfg_phy_cnt + len);
1050                 ampdu_status = le32_to_cpu(rx_pkt_status);
1051         } else {
1052                 if (!priv->last_phy_res[0]) {
1053                         IWL_ERR(priv, "MPDU frame without cached PHY data\n");
1054                         return;
1055                 }
1056                 phy_res = (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
1057                 amsdu = (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
1058                 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu));
1059                 len = le16_to_cpu(amsdu->byte_count);
1060                 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len);
1061                 ampdu_status = iwl_translate_rx_status(priv,
1062                                 le32_to_cpu(rx_pkt_status));
1063         }
1064
1065         if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
1066                 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n",
1067                                 phy_res->cfg_phy_cnt);
1068                 return;
1069         }
1070
1071         if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
1072             !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
1073                 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
1074                                 le32_to_cpu(rx_pkt_status));
1075                 return;
1076         }
1077
1078         /* This will be used in several places later */
1079         rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
1080
1081         /* rx_status carries information about the packet to mac80211 */
1082         rx_status.mactime = le64_to_cpu(phy_res->timestamp);
1083         rx_status.freq =
1084                 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel));
1085         rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
1086                                 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
1087         rx_status.rate_idx =
1088                 iwl_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
1089         rx_status.flag = 0;
1090
1091         /* TSF isn't reliable. In order to allow smooth user experience,
1092          * this W/A doesn't propagate it to the mac80211 */
1093         /*rx_status.flag |= RX_FLAG_TSFT;*/
1094
1095         priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
1096
1097         /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1098         rx_status.signal = iwl_calc_rssi(priv, phy_res);
1099
1100         /* Meaningful noise values are available only from beacon statistics,
1101          *   which are gathered only when associated, and indicate noise
1102          *   only for the associated network channel ...
1103          * Ignore these noise values while scanning (other channels) */
1104         if (iwl_is_associated(priv) &&
1105             !test_bit(STATUS_SCANNING, &priv->status)) {
1106                 rx_status.noise = priv->last_rx_noise;
1107                 rx_status.qual = iwl_calc_sig_qual(rx_status.signal,
1108                                                          rx_status.noise);
1109         } else {
1110                 rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1111                 rx_status.qual = iwl_calc_sig_qual(rx_status.signal, 0);
1112         }
1113
1114         /* Reset beacon noise level if not associated. */
1115         if (!iwl_is_associated(priv))
1116                 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1117
1118 #ifdef CONFIG_IWLWIFI_DEBUG
1119         /* Set "1" to report good data frames in groups of 100 */
1120         if (unlikely(iwl_get_debug_level(priv) & IWL_DL_RX))
1121                 iwl_dbg_report_frame(priv, phy_res, len, header, 1);
1122 #endif
1123         iwl_dbg_log_rx_data_frame(priv, len, header);
1124         IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, noise %d, qual %d, TSF %llu\n",
1125                 rx_status.signal, rx_status.noise, rx_status.qual,
1126                 (unsigned long long)rx_status.mactime);
1127
1128         /*
1129          * "antenna number"
1130          *
1131          * It seems that the antenna field in the phy flags value
1132          * is actually a bit field. This is undefined by radiotap,
1133          * it wants an actual antenna number but I always get "7"
1134          * for most legacy frames I receive indicating that the
1135          * same frame was received on all three RX chains.
1136          *
1137          * I think this field should be removed in favor of a
1138          * new 802.11n radiotap field "RX chains" that is defined
1139          * as a bitmask.
1140          */
1141         rx_status.antenna =
1142                 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
1143                 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
1144
1145         /* set the preamble flag if appropriate */
1146         if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
1147                 rx_status.flag |= RX_FLAG_SHORTPRE;
1148
1149         /* Set up the HT phy flags */
1150         if (rate_n_flags & RATE_MCS_HT_MSK)
1151                 rx_status.flag |= RX_FLAG_HT;
1152         if (rate_n_flags & RATE_MCS_HT40_MSK)
1153                 rx_status.flag |= RX_FLAG_40MHZ;
1154         if (rate_n_flags & RATE_MCS_SGI_MSK)
1155                 rx_status.flag |= RX_FLAG_SHORT_GI;
1156
1157         if (iwl_is_network_packet(priv, header)) {
1158                 priv->last_rx_rssi = rx_status.signal;
1159                 priv->last_beacon_time =  priv->ucode_beacon_time;
1160                 priv->last_tsf = le64_to_cpu(phy_res->timestamp);
1161         }
1162
1163         iwl_pass_packet_to_mac80211(priv, header, len, ampdu_status,
1164                                     rxb, &rx_status);
1165 }
1166 EXPORT_SYMBOL(iwl_rx_reply_rx);
1167
1168 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1169  * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1170 void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
1171                                     struct iwl_rx_mem_buffer *rxb)
1172 {
1173         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1174         priv->last_phy_res[0] = 1;
1175         memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
1176                sizeof(struct iwl_rx_phy_res));
1177 }
1178 EXPORT_SYMBOL(iwl_rx_reply_rx_phy);