err.no Git - linux-2.6/blob - drivers/net/wireless/iwlwifi/iwl-rx.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2008 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  * James P. Ketrenos <ipw2100-admin@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         u32 reg = 0;
 129         int ret = 0;
 130         unsigned long flags;
 131
 132         spin_lock_irqsave(&q->lock, flags);
 133
 134         if (q->need_update == 0)
 135                 goto exit_unlock;
 136
 137         /* If power-saving is in use, make sure device is awake */
 138         if (test_bit(STATUS_POWER_PMI, &priv->status)) {
 139                 reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
 140
 141                 if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
 142                         iwl_set_bit(priv, CSR_GP_CNTRL,
 143                                     CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 144                         goto exit_unlock;
 145                 }
 146
 147                 ret = iwl_grab_nic_access(priv);
 148                 if (ret)
 149                         goto exit_unlock;
 150
 151                 /* Device expects a multiple of 8 */
 152                 iwl_write_direct32(priv, FH_RSCSR_CHNL0_WPTR,
 153                                      q->write & ~0x7);
 154                 iwl_release_nic_access(priv);
 155
 156         /* Else device is assumed to be awake */
 157         } else
 158                 /* Device expects a multiple of 8 */
 159                 iwl_write32(priv, FH_RSCSR_CHNL0_WPTR, q->write & ~0x7);
 160
 161
 162         q->need_update = 0;
 163
 164  exit_unlock:
 165         spin_unlock_irqrestore(&q->lock, flags);
 166         return ret;
 167 }
 168 EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr);
 169 /**
 170  * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
 171  */
 172 static inline __le32 iwl_dma_addr2rbd_ptr(struct iwl_priv *priv,
 173                                           dma_addr_t dma_addr)
 174 {
 175         return cpu_to_le32((u32)(dma_addr >> 8));
 176 }
 177
 178 /**
 179  * iwl_rx_queue_restock - refill RX queue from pre-allocated pool
 180  *
 181  * If there are slots in the RX queue that need to be restocked,
 182  * and we have free pre-allocated buffers, fill the ranks as much
 183  * as we can, pulling from rx_free.
 184  *
 185  * This moves the 'write' index forward to catch up with 'processed', and
 186  * also updates the memory address in the firmware to reference the new
 187  * target buffer.
 188  */
 189 int iwl_rx_queue_restock(struct iwl_priv *priv)
 190 {
 191         struct iwl_rx_queue *rxq = &priv->rxq;
 192         struct list_head *element;
 193         struct iwl_rx_mem_buffer *rxb;
 194         unsigned long flags;
 195         int write;
 196         int ret = 0;
 197
 198         spin_lock_irqsave(&rxq->lock, flags);
 199         write = rxq->write & ~0x7;
 200         while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
 201                 /* Get next free Rx buffer, remove from free list */
 202                 element = rxq->rx_free.next;
 203                 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
 204                 list_del(element);
 205
 206                 /* Point to Rx buffer via next RBD in circular buffer */
 207                 rxq->bd[rxq->write] = iwl_dma_addr2rbd_ptr(priv, rxb->dma_addr);
 208                 rxq->queue[rxq->write] = rxb;
 209                 rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
 210                 rxq->free_count--;
 211         }
 212         spin_unlock_irqrestore(&rxq->lock, flags);
 213         /* If the pre-allocated buffer pool is dropping low, schedule to
 214          * refill it */
 215         if (rxq->free_count <= RX_LOW_WATERMARK)
 216                 queue_work(priv->workqueue, &priv->rx_replenish);
 217
 218
 219         /* If we've added more space for the firmware to place data, tell it.
 220          * Increment device's write pointer in multiples of 8. */
 221         if ((write != (rxq->write & ~0x7))
 222             || (abs(rxq->write - rxq->read) > 7)) {
 223                 spin_lock_irqsave(&rxq->lock, flags);
 224                 rxq->need_update = 1;
 225                 spin_unlock_irqrestore(&rxq->lock, flags);
 226                 ret = iwl_rx_queue_update_write_ptr(priv, rxq);
 227         }
 228
 229         return ret;
 230 }
 231 EXPORT_SYMBOL(iwl_rx_queue_restock);
 232
 233
 234 /**
 235  * iwl_rx_replenish - Move all used packet from rx_used to rx_free
 236  *
 237  * When moving to rx_free an SKB is allocated for the slot.
 238  *
 239  * Also restock the Rx queue via iwl_rx_queue_restock.
 240  * This is called as a scheduled work item (except for during initialization)
 241  */
 242 void iwl_rx_allocate(struct iwl_priv *priv)
 243 {
 244         struct iwl_rx_queue *rxq = &priv->rxq;
 245         struct list_head *element;
 246         struct iwl_rx_mem_buffer *rxb;
 247         unsigned long flags;
 248         spin_lock_irqsave(&rxq->lock, flags);
 249         while (!list_empty(&rxq->rx_used)) {
 250                 element = rxq->rx_used.next;
 251                 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
 252
 253                 /* Alloc a new receive buffer */
 254                 rxb->skb = alloc_skb(priv->hw_params.rx_buf_size,
 255                                 __GFP_NOWARN | GFP_ATOMIC);
 256                 if (!rxb->skb) {
 257                         if (net_ratelimit())
 258                                 printk(KERN_CRIT DRV_NAME
 259                                        ": Can not allocate SKB buffers\n");
 260                         /* We don't reschedule replenish work here -- we will
 261                          * call the restock method and if it still needs
 262                          * more buffers it will schedule replenish */
 263                         break;
 264                 }
 265                 priv->alloc_rxb_skb++;
 266                 list_del(element);
 267
 268                 /* Get physical address of RB/SKB */
 269                 rxb->dma_addr =
 270                     pci_map_single(priv->pci_dev, rxb->skb->data,
 271                            priv->hw_params.rx_buf_size, PCI_DMA_FROMDEVICE);
 272                 list_add_tail(&rxb->list, &rxq->rx_free);
 273                 rxq->free_count++;
 274         }
 275         spin_unlock_irqrestore(&rxq->lock, flags);
 276 }
 277 EXPORT_SYMBOL(iwl_rx_allocate);
 278
 279 void iwl_rx_replenish(struct iwl_priv *priv)
 280 {
 281         unsigned long flags;
 282
 283         iwl_rx_allocate(priv);
 284
 285         spin_lock_irqsave(&priv->lock, flags);
 286         iwl_rx_queue_restock(priv);
 287         spin_unlock_irqrestore(&priv->lock, flags);
 288 }
 289 EXPORT_SYMBOL(iwl_rx_replenish);
 290
 291
 292 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
 293  * If an SKB has been detached, the POOL needs to have its SKB set to NULL
 294  * This free routine walks the list of POOL entries and if SKB is set to
 295  * non NULL it is unmapped and freed
 296  */
 297 void iwl_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 298 {
 299         int i;
 300         for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
 301                 if (rxq->pool[i].skb != NULL) {
 302                         pci_unmap_single(priv->pci_dev,
 303                                          rxq->pool[i].dma_addr,
 304                                          priv->hw_params.rx_buf_size,
 305                                          PCI_DMA_FROMDEVICE);
 306                         dev_kfree_skb(rxq->pool[i].skb);
 307                 }
 308         }
 309
 310         pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
 311                             rxq->dma_addr);
 312         rxq->bd = NULL;
 313 }
 314 EXPORT_SYMBOL(iwl_rx_queue_free);
 315
 316 int iwl_rx_queue_alloc(struct iwl_priv *priv)
 317 {
 318         struct iwl_rx_queue *rxq = &priv->rxq;
 319         struct pci_dev *dev = priv->pci_dev;
 320         int i;
 321
 322         spin_lock_init(&rxq->lock);
 323         INIT_LIST_HEAD(&rxq->rx_free);
 324         INIT_LIST_HEAD(&rxq->rx_used);
 325
 326         /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
 327         rxq->bd = pci_alloc_consistent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr);
 328         if (!rxq->bd)
 329                 return -ENOMEM;
 330
 331         /* Fill the rx_used queue with _all_ of the Rx buffers */
 332         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
 333                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 334
 335         /* Set us so that we have processed and used all buffers, but have
 336          * not restocked the Rx queue with fresh buffers */
 337         rxq->read = rxq->write = 0;
 338         rxq->free_count = 0;
 339         rxq->need_update = 0;
 340         return 0;
 341 }
 342 EXPORT_SYMBOL(iwl_rx_queue_alloc);
 343
 344 void iwl_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 345 {
 346         unsigned long flags;
 347         int i;
 348         spin_lock_irqsave(&rxq->lock, flags);
 349         INIT_LIST_HEAD(&rxq->rx_free);
 350         INIT_LIST_HEAD(&rxq->rx_used);
 351         /* Fill the rx_used queue with _all_ of the Rx buffers */
 352         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
 353                 /* In the reset function, these buffers may have been allocated
 354                  * to an SKB, so we need to unmap and free potential storage */
 355                 if (rxq->pool[i].skb != NULL) {
 356                         pci_unmap_single(priv->pci_dev,
 357                                          rxq->pool[i].dma_addr,
 358                                          priv->hw_params.rx_buf_size,
 359                                          PCI_DMA_FROMDEVICE);
 360                         priv->alloc_rxb_skb--;
 361                         dev_kfree_skb(rxq->pool[i].skb);
 362                         rxq->pool[i].skb = NULL;
 363                 }
 364                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 365         }
 366
 367         /* Set us so that we have processed and used all buffers, but have
 368          * not restocked the Rx queue with fresh buffers */
 369         rxq->read = rxq->write = 0;
 370         rxq->free_count = 0;
 371         spin_unlock_irqrestore(&rxq->lock, flags);
 372 }
 373 EXPORT_SYMBOL(iwl_rx_queue_reset);
 374
 375 int iwl_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 376 {
 377         int ret;
 378         unsigned long flags;
 379         unsigned int rb_size;
 380
 381         spin_lock_irqsave(&priv->lock, flags);
 382         ret = iwl_grab_nic_access(priv);
 383         if (ret) {
 384                 spin_unlock_irqrestore(&priv->lock, flags);
 385                 return ret;
 386         }
 387
 388         if (priv->cfg->mod_params->amsdu_size_8K)
 389                 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
 390         else
 391                 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
 392
 393         /* Stop Rx DMA */
 394         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 395
 396         /* Reset driver's Rx queue write index */
 397         iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
 398
 399         /* Tell device where to find RBD circular buffer in DRAM */
 400         iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
 401                            rxq->dma_addr >> 8);
 402
 403         /* Tell device where in DRAM to update its Rx status */
 404         iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
 405                            (priv->shared_phys + priv->rb_closed_offset) >> 4);
 406
 407         /* Enable Rx DMA, enable host interrupt, Rx buffer size 4k, 256 RBDs */
 408         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
 409                            FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
 410                            FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
 411                            rb_size |
 412                              /* 0x10 << 4 | */
 413                            (RX_QUEUE_SIZE_LOG <<
 414                               FH_RCSR_RX_CONFIG_RBDCB_SIZE_BITSHIFT));
 415
 416         /*
 417          * iwl_write32(priv,CSR_INT_COAL_REG,0);
 418          */
 419
 420         iwl_release_nic_access(priv);
 421         spin_unlock_irqrestore(&priv->lock, flags);
 422
 423         return 0;
 424 }
 425
 426 int iwl_rxq_stop(struct iwl_priv *priv)
 427 {
 428         int ret;
 429         unsigned long flags;
 430
 431         spin_lock_irqsave(&priv->lock, flags);
 432         ret = iwl_grab_nic_access(priv);
 433         if (unlikely(ret)) {
 434                 spin_unlock_irqrestore(&priv->lock, flags);
 435                 return ret;
 436         }
 437
 438         /* stop Rx DMA */
 439         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 440         ret = iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
 441                                      (1 << 24), 1000);
 442         if (ret < 0)
 443                 IWL_ERROR("Can't stop Rx DMA.\n");
 444
 445         iwl_release_nic_access(priv);
 446         spin_unlock_irqrestore(&priv->lock, flags);
 447
 448         return 0;
 449 }
 450 EXPORT_SYMBOL(iwl_rxq_stop);
 451
 452 void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
 453                                 struct iwl_rx_mem_buffer *rxb)
 454
 455 {
 456         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
 457         struct iwl4965_missed_beacon_notif *missed_beacon;
 458
 459         missed_beacon = &pkt->u.missed_beacon;
 460         if (le32_to_cpu(missed_beacon->consequtive_missed_beacons) > 5) {
 461                 IWL_DEBUG_CALIB("missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 462                     le32_to_cpu(missed_beacon->consequtive_missed_beacons),
 463                     le32_to_cpu(missed_beacon->total_missed_becons),
 464                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 465                     le32_to_cpu(missed_beacon->num_expected_beacons));
 466                 if (!test_bit(STATUS_SCANNING, &priv->status))
 467                         iwl_init_sensitivity(priv);
 468         }
 469 }
 470 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif);
 471
 472 int iwl_rx_agg_start(struct iwl_priv *priv, const u8 *addr, int tid, u16 ssn)
 473 {
 474         unsigned long flags;
 475         int sta_id;
 476
 477         sta_id = iwl_find_station(priv, addr);
 478         if (sta_id == IWL_INVALID_STATION)
 479                 return -ENXIO;
 480
 481         spin_lock_irqsave(&priv->sta_lock, flags);
 482         priv->stations[sta_id].sta.station_flags_msk = 0;
 483         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_ADDBA_TID_MSK;
 484         priv->stations[sta_id].sta.add_immediate_ba_tid = (u8)tid;
 485         priv->stations[sta_id].sta.add_immediate_ba_ssn = cpu_to_le16(ssn);
 486         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 487         spin_unlock_irqrestore(&priv->sta_lock, flags);
 488
 489         return iwl_send_add_sta(priv, &priv->stations[sta_id].sta,
 490                                         CMD_ASYNC);
 491 }
 492 EXPORT_SYMBOL(iwl_rx_agg_start);
 493
 494 int iwl_rx_agg_stop(struct iwl_priv *priv, const u8 *addr, int tid)
 495 {
 496         unsigned long flags;
 497         int sta_id;
 498
 499         sta_id = iwl_find_station(priv, addr);
 500         if (sta_id == IWL_INVALID_STATION)
 501                 return -ENXIO;
 502
 503         spin_lock_irqsave(&priv->sta_lock, flags);
 504         priv->stations[sta_id].sta.station_flags_msk = 0;
 505         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_DELBA_TID_MSK;
 506         priv->stations[sta_id].sta.remove_immediate_ba_tid = (u8)tid;
 507         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 508         spin_unlock_irqrestore(&priv->sta_lock, flags);
 509
 510         return iwl_send_add_sta(priv, &priv->stations[sta_id].sta,
 511                                         CMD_ASYNC);
 512 }
 513 EXPORT_SYMBOL(iwl_rx_agg_stop);
 514
 515
 516 /* Calculate noise level, based on measurements during network silence just
 517  *   before arriving beacon.  This measurement can be done only if we know
 518  *   exactly when to expect beacons, therefore only when we're associated. */
 519 static void iwl_rx_calc_noise(struct iwl_priv *priv)
 520 {
 521         struct statistics_rx_non_phy *rx_info
 522                                 = &(priv->statistics.rx.general);
 523         int num_active_rx = 0;
 524         int total_silence = 0;
 525         int bcn_silence_a =
 526                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 527         int bcn_silence_b =
 528                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 529         int bcn_silence_c =
 530                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 531
 532         if (bcn_silence_a) {
 533                 total_silence += bcn_silence_a;
 534                 num_active_rx++;
 535         }
 536         if (bcn_silence_b) {
 537                 total_silence += bcn_silence_b;
 538                 num_active_rx++;
 539         }
 540         if (bcn_silence_c) {
 541                 total_silence += bcn_silence_c;
 542                 num_active_rx++;
 543         }
 544
 545         /* Average among active antennas */
 546         if (num_active_rx)
 547                 priv->last_rx_noise = (total_silence / num_active_rx) - 107;
 548         else
 549                 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 550
 551         IWL_DEBUG_CALIB("inband silence a %u, b %u, c %u, dBm %d\n",
 552                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 553                         priv->last_rx_noise);
 554 }
 555
 556 #define REG_RECALIB_PERIOD (60)
 557
 558 void iwl_rx_statistics(struct iwl_priv *priv,
 559                               struct iwl_rx_mem_buffer *rxb)
 560 {
 561         int change;
 562         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
 563
 564         IWL_DEBUG_RX("Statistics notification received (%d vs %d).\n",
 565                      (int)sizeof(priv->statistics), pkt->len);
 566
 567         change = ((priv->statistics.general.temperature !=
 568                    pkt->u.stats.general.temperature) ||
 569                   ((priv->statistics.flag &
 570                     STATISTICS_REPLY_FLG_FAT_MODE_MSK) !=
 571                    (pkt->u.stats.flag & STATISTICS_REPLY_FLG_FAT_MODE_MSK)));
 572
 573         memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics));
 574
 575         set_bit(STATUS_STATISTICS, &priv->status);
 576
 577         /* Reschedule the statistics timer to occur in
 578          * REG_RECALIB_PERIOD seconds to ensure we get a
 579          * thermal update even if the uCode doesn't give
 580          * us one */
 581         mod_timer(&priv->statistics_periodic, jiffies +
 582                   msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
 583
 584         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 585             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 586                 iwl_rx_calc_noise(priv);
 587                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 588         }
 589
 590         iwl_leds_background(priv);
 591
 592         if (priv->cfg->ops->lib->temperature && change)
 593                 priv->cfg->ops->lib->temperature(priv);
 594 }
 595 EXPORT_SYMBOL(iwl_rx_statistics);
 596
 597 #define PERFECT_RSSI (-20) /* dBm */
 598 #define WORST_RSSI (-95)   /* dBm */
 599 #define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
 600
 601 /* Calculate an indication of rx signal quality (a percentage, not dBm!).
 602  * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
 603  *   about formulas used below. */
 604 static int iwl_calc_sig_qual(int rssi_dbm, int noise_dbm)
 605 {
 606         int sig_qual;
 607         int degradation = PERFECT_RSSI - rssi_dbm;
 608
 609         /* If we get a noise measurement, use signal-to-noise ratio (SNR)
 610          * as indicator; formula is (signal dbm - noise dbm).
 611          * SNR at or above 40 is a great signal (100%).
 612          * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
 613          * Weakest usable signal is usually 10 - 15 dB SNR. */
 614         if (noise_dbm) {
 615                 if (rssi_dbm - noise_dbm >= 40)
 616                         return 100;
 617                 else if (rssi_dbm < noise_dbm)
 618                         return 0;
 619                 sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2;
 620
 621         /* Else use just the signal level.
 622          * This formula is a least squares fit of data points collected and
 623          *   compared with a reference system that had a percentage (%) display
 624          *   for signal quality. */
 625         } else
 626                 sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation *
 627                             (15 * RSSI_RANGE + 62 * degradation)) /
 628                            (RSSI_RANGE * RSSI_RANGE);
 629
 630         if (sig_qual > 100)
 631                 sig_qual = 100;
 632         else if (sig_qual < 1)
 633                 sig_qual = 0;
 634
 635         return sig_qual;
 636 }
 637
 638 #ifdef CONFIG_IWLWIFI_DEBUG
 639
 640 /**
 641  * iwl_dbg_report_frame - dump frame to syslog during debug sessions
 642  *
 643  * You may hack this function to show different aspects of received frames,
 644  * including selective frame dumps.
 645  * group100 parameter selects whether to show 1 out of 100 good frames.
 646  *
 647  * TODO:  This was originally written for 3945, need to audit for
 648  *        proper operation with 4965.
 649  */
 650 static void iwl_dbg_report_frame(struct iwl_priv *priv,
 651                       struct iwl_rx_packet *pkt,
 652                       struct ieee80211_hdr *header, int group100)
 653 {
 654         u32 to_us;
 655         u32 print_summary = 0;
 656         u32 print_dump = 0;     /* set to 1 to dump all frames' contents */
 657         u32 hundred = 0;
 658         u32 dataframe = 0;
 659         __le16 fc;
 660         u16 seq_ctl;
 661         u16 channel;
 662         u16 phy_flags;
 663         int rate_sym;
 664         u16 length;
 665         u16 status;
 666         u16 bcn_tmr;
 667         u32 tsf_low;
 668         u64 tsf;
 669         u8 rssi;
 670         u8 agc;
 671         u16 sig_avg;
 672         u16 noise_diff;
 673         struct iwl4965_rx_frame_stats *rx_stats = IWL_RX_STATS(pkt);
 674         struct iwl4965_rx_frame_hdr *rx_hdr = IWL_RX_HDR(pkt);
 675         struct iwl4965_rx_frame_end *rx_end = IWL_RX_END(pkt);
 676         u8 *data = IWL_RX_DATA(pkt);
 677
 678         if (likely(!(priv->debug_level & IWL_DL_RX)))
 679                 return;
 680
 681         /* MAC header */
 682         fc = header->frame_control;
 683         seq_ctl = le16_to_cpu(header->seq_ctrl);
 684
 685         /* metadata */
 686         channel = le16_to_cpu(rx_hdr->channel);
 687         phy_flags = le16_to_cpu(rx_hdr->phy_flags);
 688         rate_sym = rx_hdr->rate;
 689         length = le16_to_cpu(rx_hdr->len);
 690
 691         /* end-of-frame status and timestamp */
 692         status = le32_to_cpu(rx_end->status);
 693         bcn_tmr = le32_to_cpu(rx_end->beacon_timestamp);
 694         tsf_low = le64_to_cpu(rx_end->timestamp) & 0x0ffffffff;
 695         tsf = le64_to_cpu(rx_end->timestamp);
 696
 697         /* signal statistics */
 698         rssi = rx_stats->rssi;
 699         agc = rx_stats->agc;
 700         sig_avg = le16_to_cpu(rx_stats->sig_avg);
 701         noise_diff = le16_to_cpu(rx_stats->noise_diff);
 702
 703         to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
 704
 705         /* if data frame is to us and all is good,
 706          *   (optionally) print summary for only 1 out of every 100 */
 707         if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
 708             cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
 709                 dataframe = 1;
 710                 if (!group100)
 711                         print_summary = 1;      /* print each frame */
 712                 else if (priv->framecnt_to_us < 100) {
 713                         priv->framecnt_to_us++;
 714                         print_summary = 0;
 715                 } else {
 716                         priv->framecnt_to_us = 0;
 717                         print_summary = 1;
 718                         hundred = 1;
 719                 }
 720         } else {
 721                 /* print summary for all other frames */
 722                 print_summary = 1;
 723         }
 724
 725         if (print_summary) {
 726                 char *title;
 727                 int rate_idx;
 728                 u32 bitrate;
 729
 730                 if (hundred)
 731                         title = "100Frames";
 732                 else if (ieee80211_has_retry(fc))
 733                         title = "Retry";
 734                 else if (ieee80211_is_assoc_resp(fc))
 735                         title = "AscRsp";
 736                 else if (ieee80211_is_reassoc_resp(fc))
 737                         title = "RasRsp";
 738                 else if (ieee80211_is_probe_resp(fc)) {
 739                         title = "PrbRsp";
 740                         print_dump = 1; /* dump frame contents */
 741                 } else if (ieee80211_is_beacon(fc)) {
 742                         title = "Beacon";
 743                         print_dump = 1; /* dump frame contents */
 744                 } else if (ieee80211_is_atim(fc))
 745                         title = "ATIM";
 746                 else if (ieee80211_is_auth(fc))
 747                         title = "Auth";
 748                 else if (ieee80211_is_deauth(fc))
 749                         title = "DeAuth";
 750                 else if (ieee80211_is_disassoc(fc))
 751                         title = "DisAssoc";
 752                 else
 753                         title = "Frame";
 754
 755                 rate_idx = iwl_hwrate_to_plcp_idx(rate_sym);
 756                 if (unlikely(rate_idx == -1))
 757                         bitrate = 0;
 758                 else
 759                         bitrate = iwl_rates[rate_idx].ieee / 2;
 760
 761                 /* print frame summary.
 762                  * MAC addresses show just the last byte (for brevity),
 763                  *    but you can hack it to show more, if you'd like to. */
 764                 if (dataframe)
 765                         IWL_DEBUG_RX("%s: mhd=0x%04x, dst=0x%02x, "
 766                                      "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
 767                                      title, le16_to_cpu(fc), header->addr1[5],
 768                                      length, rssi, channel, bitrate);
 769                 else {
 770                         /* src/dst addresses assume managed mode */
 771                         IWL_DEBUG_RX("%s: 0x%04x, dst=0x%02x, "
 772                                      "src=0x%02x, rssi=%u, tim=%lu usec, "
 773                                      "phy=0x%02x, chnl=%d\n",
 774                                      title, le16_to_cpu(fc), header->addr1[5],
 775                                      header->addr3[5], rssi,
 776                                      tsf_low - priv->scan_start_tsf,
 777                                      phy_flags, channel);
 778                 }
 779         }
 780         if (print_dump)
 781                 iwl_print_hex_dump(priv, IWL_DL_RX, data, length);
 782 }
 783 #else
 784 static inline void iwl_dbg_report_frame(struct iwl_priv *priv,
 785                                             struct iwl_rx_packet *pkt,
 786                                             struct ieee80211_hdr *header,
 787                                             int group100)
 788 {
 789 }
 790 #endif
 791
 792 static void iwl_add_radiotap(struct iwl_priv *priv,
 793                                  struct sk_buff *skb,
 794                                  struct iwl_rx_phy_res *rx_start,
 795                                  struct ieee80211_rx_status *stats,
 796                                  u32 ampdu_status)
 797 {
 798         s8 signal = stats->signal;
 799         s8 noise = 0;
 800         int rate = stats->rate_idx;
 801         u64 tsf = stats->mactime;
 802         __le16 antenna;
 803         __le16 phy_flags_hw = rx_start->phy_flags;
 804         struct iwl4965_rt_rx_hdr {
 805                 struct ieee80211_radiotap_header rt_hdr;
 806                 __le64 rt_tsf;          /* TSF */
 807                 u8 rt_flags;            /* radiotap packet flags */
 808                 u8 rt_rate;             /* rate in 500kb/s */
 809                 __le16 rt_channelMHz;   /* channel in MHz */
 810                 __le16 rt_chbitmask;    /* channel bitfield */
 811                 s8 rt_dbmsignal;        /* signal in dBm, kluged to signed */
 812                 s8 rt_dbmnoise;
 813                 u8 rt_antenna;          /* antenna number */
 814         } __attribute__ ((packed)) *iwl4965_rt;
 815
 816         /* TODO: We won't have enough headroom for HT frames. Fix it later. */
 817         if (skb_headroom(skb) < sizeof(*iwl4965_rt)) {
 818                 if (net_ratelimit())
 819                         printk(KERN_ERR "not enough headroom [%d] for "
 820                                "radiotap head [%zd]\n",
 821                                skb_headroom(skb), sizeof(*iwl4965_rt));
 822                 return;
 823         }
 824
 825         /* put radiotap header in front of 802.11 header and data */
 826         iwl4965_rt = (void *)skb_push(skb, sizeof(*iwl4965_rt));
 827
 828         /* initialise radiotap header */
 829         iwl4965_rt->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;
 830         iwl4965_rt->rt_hdr.it_pad = 0;
 831
 832         /* total header + data */
 833         put_unaligned_le16(sizeof(*iwl4965_rt), &iwl4965_rt->rt_hdr.it_len);
 834
 835         /* Indicate all the fields we add to the radiotap header */
 836         put_unaligned_le32((1 << IEEE80211_RADIOTAP_TSFT) |
 837                            (1 << IEEE80211_RADIOTAP_FLAGS) |
 838                            (1 << IEEE80211_RADIOTAP_RATE) |
 839                            (1 << IEEE80211_RADIOTAP_CHANNEL) |
 840                            (1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL) |
 841                            (1 << IEEE80211_RADIOTAP_DBM_ANTNOISE) |
 842                            (1 << IEEE80211_RADIOTAP_ANTENNA),
 843                            &(iwl4965_rt->rt_hdr.it_present));
 844
 845         /* Zero the flags, we'll add to them as we go */
 846         iwl4965_rt->rt_flags = 0;
 847
 848         put_unaligned_le64(tsf, &iwl4965_rt->rt_tsf);
 849
 850         iwl4965_rt->rt_dbmsignal = signal;
 851         iwl4965_rt->rt_dbmnoise = noise;
 852
 853         /* Convert the channel frequency and set the flags */
 854         put_unaligned(cpu_to_le16(stats->freq), &iwl4965_rt->rt_channelMHz);
 855         if (!(phy_flags_hw & RX_RES_PHY_FLAGS_BAND_24_MSK))
 856                 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
 857                                    &iwl4965_rt->rt_chbitmask);
 858         else if (phy_flags_hw & RX_RES_PHY_FLAGS_MOD_CCK_MSK)
 859                 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
 860                                    &iwl4965_rt->rt_chbitmask);
 861         else    /* 802.11g */
 862                 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
 863                                    &iwl4965_rt->rt_chbitmask);
 864
 865         if (rate == -1)
 866                 iwl4965_rt->rt_rate = 0;
 867         else
 868                 iwl4965_rt->rt_rate = iwl_rates[rate].ieee;
 869
 870         /*
 871          * "antenna number"
 872          *
 873          * It seems that the antenna field in the phy flags value
 874          * is actually a bitfield. This is undefined by radiotap,
 875          * it wants an actual antenna number but I always get "7"
 876          * for most legacy frames I receive indicating that the
 877          * same frame was received on all three RX chains.
 878          *
 879          * I think this field should be removed in favour of a
 880          * new 802.11n radiotap field "RX chains" that is defined
 881          * as a bitmask.
 882          */
 883         antenna = phy_flags_hw & RX_RES_PHY_FLAGS_ANTENNA_MSK;
 884         iwl4965_rt->rt_antenna = le16_to_cpu(antenna) >> 4;
 885
 886         /* set the preamble flag if appropriate */
 887         if (phy_flags_hw & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
 888                 iwl4965_rt->rt_flags |= IEEE80211_RADIOTAP_F_SHORTPRE;
 889
 890         stats->flag |= RX_FLAG_RADIOTAP;
 891 }
 892
 893 static void iwl_update_rx_stats(struct iwl_priv *priv, u16 fc, u16 len)
 894 {
 895         /* 0 - mgmt, 1 - cnt, 2 - data */
 896         int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2;
 897         priv->rx_stats[idx].cnt++;
 898         priv->rx_stats[idx].bytes += len;
 899 }
 900
 901 /*
 902  * returns non-zero if packet should be dropped
 903  */
 904 static int iwl_set_decrypted_flag(struct iwl_priv *priv,
 905                                       struct ieee80211_hdr *hdr,
 906                                       u32 decrypt_res,
 907                                       struct ieee80211_rx_status *stats)
 908 {
 909         u16 fc = le16_to_cpu(hdr->frame_control);
 910
 911         if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
 912                 return 0;
 913
 914         if (!(fc & IEEE80211_FCTL_PROTECTED))
 915                 return 0;
 916
 917         IWL_DEBUG_RX("decrypt_res:0x%x\n", decrypt_res);
 918         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 919         case RX_RES_STATUS_SEC_TYPE_TKIP:
 920                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 921                  * Decryption will be done in SW. */
 922                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 923                     RX_RES_STATUS_BAD_KEY_TTAK)
 924                         break;
 925
 926         case RX_RES_STATUS_SEC_TYPE_WEP:
 927                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 928                     RX_RES_STATUS_BAD_ICV_MIC) {
 929                         /* bad ICV, the packet is destroyed since the
 930                          * decryption is inplace, drop it */
 931                         IWL_DEBUG_RX("Packet destroyed\n");
 932                         return -1;
 933                 }
 934         case RX_RES_STATUS_SEC_TYPE_CCMP:
 935                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 936                     RX_RES_STATUS_DECRYPT_OK) {
 937                         IWL_DEBUG_RX("hw decrypt successfully!!!\n");
 938                         stats->flag |= RX_FLAG_DECRYPTED;
 939                 }
 940                 break;
 941
 942         default:
 943                 break;
 944         }
 945         return 0;
 946 }
 947
 948 static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
 949 {
 950         u32 decrypt_out = 0;
 951
 952         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
 953                                         RX_RES_STATUS_STATION_FOUND)
 954                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
 955                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
 956
 957         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
 958
 959         /* packet was not encrypted */
 960         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 961                                         RX_RES_STATUS_SEC_TYPE_NONE)
 962                 return decrypt_out;
 963
 964         /* packet was encrypted with unknown alg */
 965         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
 966                                         RX_RES_STATUS_SEC_TYPE_ERR)
 967                 return decrypt_out;
 968
 969         /* decryption was not done in HW */
 970         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
 971                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
 972                 return decrypt_out;
 973
 974         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
 975
 976         case RX_RES_STATUS_SEC_TYPE_CCMP:
 977                 /* alg is CCM: check MIC only */
 978                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
 979                         /* Bad MIC */
 980                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 981                 else
 982                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 983
 984                 break;
 985
 986         case RX_RES_STATUS_SEC_TYPE_TKIP:
 987                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
 988                         /* Bad TTAK */
 989                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
 990                         break;
 991                 }
 992                 /* fall through if TTAK OK */
 993         default:
 994                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
 995                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
 996                 else
 997                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
 998                 break;
 999         };
1000
1001         IWL_DEBUG_RX("decrypt_in:0x%x  decrypt_out = 0x%x\n",
1002                                         decrypt_in, decrypt_out);
1003
1004         return decrypt_out;
1005 }
1006
1007 static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
1008                                        int include_phy,
1009                                        struct iwl_rx_mem_buffer *rxb,
1010                                        struct ieee80211_rx_status *stats)
1011 {
1012         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
1013         struct iwl_rx_phy_res *rx_start = (include_phy) ?
1014             (struct iwl_rx_phy_res *)&(pkt->u.raw[0]) : NULL;
1015         struct ieee80211_hdr *hdr;
1016         u16 len;
1017         __le32 *rx_end;
1018         unsigned int skblen;
1019         u32 ampdu_status;
1020         u32 ampdu_status_legacy;
1021
1022         if (!include_phy && priv->last_phy_res[0])
1023                 rx_start = (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
1024
1025         if (!rx_start) {
1026                 IWL_ERROR("MPDU frame without a PHY data\n");
1027                 return;
1028         }
1029         if (include_phy) {
1030                 hdr = (struct ieee80211_hdr *)((u8 *) &rx_start[1] +
1031                                                rx_start->cfg_phy_cnt);
1032
1033                 len = le16_to_cpu(rx_start->byte_count);
1034
1035                 rx_end = (__le32 *)((u8 *) &pkt->u.raw[0] +
1036                                   sizeof(struct iwl_rx_phy_res) +
1037                                   rx_start->cfg_phy_cnt + len);
1038
1039         } else {
1040                 struct iwl4965_rx_mpdu_res_start *amsdu =
1041                     (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
1042
1043                 hdr = (struct ieee80211_hdr *)(pkt->u.raw +
1044                                sizeof(struct iwl4965_rx_mpdu_res_start));
1045                 len =  le16_to_cpu(amsdu->byte_count);
1046                 rx_start->byte_count = amsdu->byte_count;
1047                 rx_end = (__le32 *) (((u8 *) hdr) + len);
1048         }
1049
1050         ampdu_status = le32_to_cpu(*rx_end);
1051         skblen = ((u8 *) rx_end - (u8 *) &pkt->u.raw[0]) + sizeof(u32);
1052
1053         if (!include_phy) {
1054                 /* New status scheme, need to translate */
1055                 ampdu_status_legacy = ampdu_status;
1056                 ampdu_status = iwl_translate_rx_status(priv, ampdu_status);
1057         }
1058
1059         /* start from MAC */
1060         skb_reserve(rxb->skb, (void *)hdr - (void *)pkt);
1061         skb_put(rxb->skb, len); /* end where data ends */
1062
1063         /* We only process data packets if the interface is open */
1064         if (unlikely(!priv->is_open)) {
1065                 IWL_DEBUG_DROP_LIMIT
1066                     ("Dropping packet while interface is not open.\n");
1067                 return;
1068         }
1069
1070         hdr = (struct ieee80211_hdr *)rxb->skb->data;
1071
1072         /*  in case of HW accelerated crypto and bad decryption, drop */
1073         if (!priv->hw_params.sw_crypto &&
1074             iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
1075                 return;
1076
1077         if (priv->add_radiotap)
1078                 iwl_add_radiotap(priv, rxb->skb, rx_start, stats, ampdu_status);
1079
1080         iwl_update_rx_stats(priv, le16_to_cpu(hdr->frame_control), len);
1081         ieee80211_rx_irqsafe(priv->hw, rxb->skb, stats);
1082         priv->alloc_rxb_skb--;
1083         rxb->skb = NULL;
1084 }
1085
1086 /* Calc max signal level (dBm) among 3 possible receivers */
1087 static inline int iwl_calc_rssi(struct iwl_priv *priv,
1088                                 struct iwl_rx_phy_res *rx_resp)
1089 {
1090         return priv->cfg->ops->utils->calc_rssi(priv, rx_resp);
1091 }
1092
1093
1094 static void iwl_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
1095 {
1096         unsigned long flags;
1097
1098         spin_lock_irqsave(&priv->sta_lock, flags);
1099         priv->stations[sta_id].sta.station_flags &= ~STA_FLG_PWR_SAVE_MSK;
1100         priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
1101         priv->stations[sta_id].sta.sta.modify_mask = 0;
1102         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1103         spin_unlock_irqrestore(&priv->sta_lock, flags);
1104
1105         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1106 }
1107
1108 static void iwl_update_ps_mode(struct iwl_priv *priv, u16 ps_bit, u8 *addr)
1109 {
1110         /* FIXME: need locking over ps_status ??? */
1111         u8 sta_id = iwl_find_station(priv, addr);
1112
1113         if (sta_id != IWL_INVALID_STATION) {
1114                 u8 sta_awake = priv->stations[sta_id].
1115                                 ps_status == STA_PS_STATUS_WAKE;
1116
1117                 if (sta_awake && ps_bit)
1118                         priv->stations[sta_id].ps_status = STA_PS_STATUS_SLEEP;
1119                 else if (!sta_awake && !ps_bit) {
1120                         iwl_sta_modify_ps_wake(priv, sta_id);
1121                         priv->stations[sta_id].ps_status = STA_PS_STATUS_WAKE;
1122                 }
1123         }
1124 }
1125
1126 /* This is necessary only for a number of statistics, see the caller. */
1127 static int iwl_is_network_packet(struct iwl_priv *priv,
1128                 struct ieee80211_hdr *header)
1129 {
1130         /* Filter incoming packets to determine if they are targeted toward
1131          * this network, discarding packets coming from ourselves */
1132         switch (priv->iw_mode) {
1133         case IEEE80211_IF_TYPE_IBSS: /* Header: Dest. | Source    | BSSID */
1134                 /* packets to our IBSS update information */
1135                 return !compare_ether_addr(header->addr3, priv->bssid);
1136         case IEEE80211_IF_TYPE_STA: /* Header: Dest. | AP{BSSID} | Source */
1137                 /* packets to our IBSS update information */
1138                 return !compare_ether_addr(header->addr2, priv->bssid);
1139         default:
1140                 return 1;
1141         }
1142 }
1143
1144 /* Called for REPLY_RX (legacy ABG frames), or
1145  * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
1146 void iwl_rx_reply_rx(struct iwl_priv *priv,
1147                                 struct iwl_rx_mem_buffer *rxb)
1148 {
1149         struct ieee80211_hdr *header;
1150         struct ieee80211_rx_status rx_status;
1151         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
1152         /* Use phy data (Rx signal strength, etc.) contained within
1153          *   this rx packet for legacy frames,
1154          *   or phy data cached from REPLY_RX_PHY_CMD for HT frames. */
1155         int include_phy = (pkt->hdr.cmd == REPLY_RX);
1156         struct iwl_rx_phy_res *rx_start = (include_phy) ?
1157                 (struct iwl_rx_phy_res *)&(pkt->u.raw[0]) :
1158                 (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
1159         __le32 *rx_end;
1160         unsigned int len = 0;
1161         u16 fc;
1162         u8 network_packet;
1163
1164         rx_status.mactime = le64_to_cpu(rx_start->timestamp);
1165         rx_status.freq =
1166                 ieee80211_channel_to_frequency(le16_to_cpu(rx_start->channel));
1167         rx_status.band = (rx_start->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
1168                                 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
1169         rx_status.rate_idx =
1170                 iwl_hwrate_to_plcp_idx(le32_to_cpu(rx_start->rate_n_flags));
1171         if (rx_status.band == IEEE80211_BAND_5GHZ)
1172                 rx_status.rate_idx -= IWL_FIRST_OFDM_RATE;
1173
1174         rx_status.antenna = 0;
1175         rx_status.flag = 0;
1176
1177         /* TSF isn't reliable. In order to allow smooth user experience,
1178          * this W/A doesn't propagate it to the mac80211 */
1179         /*rx_status.flag |= RX_FLAG_TSFT;*/
1180
1181         if ((unlikely(rx_start->cfg_phy_cnt > 20))) {
1182                 IWL_DEBUG_DROP("dsp size out of range [0,20]: %d/n",
1183                                 rx_start->cfg_phy_cnt);
1184                 return;
1185         }
1186
1187         if (!include_phy) {
1188                 if (priv->last_phy_res[0])
1189                         rx_start = (struct iwl_rx_phy_res *)
1190                                 &priv->last_phy_res[1];
1191                 else
1192                         rx_start = NULL;
1193         }
1194
1195         if (!rx_start) {
1196                 IWL_ERROR("MPDU frame without a PHY data\n");
1197                 return;
1198         }
1199
1200         if (include_phy) {
1201                 header = (struct ieee80211_hdr *)((u8 *) &rx_start[1]
1202                                                   + rx_start->cfg_phy_cnt);
1203
1204                 len = le16_to_cpu(rx_start->byte_count);
1205                 rx_end = (__le32 *)(pkt->u.raw + rx_start->cfg_phy_cnt +
1206                                   sizeof(struct iwl_rx_phy_res) + len);
1207         } else {
1208                 struct iwl4965_rx_mpdu_res_start *amsdu =
1209                         (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
1210
1211                 header = (void *)(pkt->u.raw +
1212                         sizeof(struct iwl4965_rx_mpdu_res_start));
1213                 len = le16_to_cpu(amsdu->byte_count);
1214                 rx_end = (__le32 *) (pkt->u.raw +
1215                         sizeof(struct iwl4965_rx_mpdu_res_start) + len);
1216         }
1217
1218         if (!(*rx_end & RX_RES_STATUS_NO_CRC32_ERROR) ||
1219             !(*rx_end & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
1220                 IWL_DEBUG_RX("Bad CRC or FIFO: 0x%08X.\n",
1221                                 le32_to_cpu(*rx_end));
1222                 return;
1223         }
1224
1225         priv->ucode_beacon_time = le32_to_cpu(rx_start->beacon_time_stamp);
1226
1227         /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1228         rx_status.signal = iwl_calc_rssi(priv, rx_start);
1229
1230         /* Meaningful noise values are available only from beacon statistics,
1231          *   which are gathered only when associated, and indicate noise
1232          *   only for the associated network channel ...
1233          * Ignore these noise values while scanning (other channels) */
1234         if (iwl_is_associated(priv) &&
1235             !test_bit(STATUS_SCANNING, &priv->status)) {
1236                 rx_status.noise = priv->last_rx_noise;
1237                 rx_status.qual = iwl_calc_sig_qual(rx_status.signal,
1238                                                          rx_status.noise);
1239         } else {
1240                 rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1241                 rx_status.qual = iwl_calc_sig_qual(rx_status.signal, 0);
1242         }
1243
1244         /* Reset beacon noise level if not associated. */
1245         if (!iwl_is_associated(priv))
1246                 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1247
1248         /* Set "1" to report good data frames in groups of 100 */
1249         /* FIXME: need to optimze the call: */
1250         iwl_dbg_report_frame(priv, pkt, header, 1);
1251
1252         IWL_DEBUG_STATS_LIMIT("Rssi %d, noise %d, qual %d, TSF %llu\n",
1253                 rx_status.signal, rx_status.noise, rx_status.signal,
1254                 (unsigned long long)rx_status.mactime);
1255
1256         /* Take shortcut when only in monitor mode */
1257         if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR) {
1258                 iwl_pass_packet_to_mac80211(priv, include_phy,
1259                                                  rxb, &rx_status);
1260                 return;
1261         }
1262
1263         network_packet = iwl_is_network_packet(priv, header);
1264         if (network_packet) {
1265                 priv->last_rx_rssi = rx_status.signal;
1266                 priv->last_beacon_time =  priv->ucode_beacon_time;
1267                 priv->last_tsf = le64_to_cpu(rx_start->timestamp);
1268         }
1269
1270         fc = le16_to_cpu(header->frame_control);
1271         switch (fc & IEEE80211_FCTL_FTYPE) {
1272         case IEEE80211_FTYPE_MGMT:
1273         case IEEE80211_FTYPE_DATA:
1274                 if (priv->iw_mode == IEEE80211_IF_TYPE_AP)
1275                         iwl_update_ps_mode(priv, fc  & IEEE80211_FCTL_PM,
1276                                                 header->addr2);
1277                 /* fall through */
1278         default:
1279                         iwl_pass_packet_to_mac80211(priv, include_phy, rxb,
1280                                    &rx_status);
1281                 break;
1282
1283         }
1284 }
1285 EXPORT_SYMBOL(iwl_rx_reply_rx);
1286
1287 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1288  * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1289 void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
1290                                     struct iwl_rx_mem_buffer *rxb)
1291 {
1292         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
1293         priv->last_phy_res[0] = 1;
1294         memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
1295                sizeof(struct iwl_rx_phy_res));
1296 }
1297 EXPORT_SYMBOL(iwl_rx_reply_rx_phy);