1 /******************************************************************************
3 * Copyright(c) 2003 - 2008 Intel Corporation. All rights reserved.
5 * Portions of this file are derived from the ipw3945 project, as well
6 * as portions of the ieee80211 subsystem header files.
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.
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
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
21 * The full GNU General Public License is included in this distribution in the
22 * file called LICENSE.
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
28 *****************************************************************************/
30 #include <linux/etherdevice.h>
31 #include <net/mac80211.h>
32 #include <asm/unaligned.h>
33 #include "iwl-eeprom.h"
38 #include "iwl-calib.h"
39 #include "iwl-helpers.h"
40 /************************** RX-FUNCTIONS ****************************/
42 * Rx theory of operation
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.
51 * The host/firmware share two index registers for managing the Rx buffers.
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
56 * The READ index is managed by the firmware once the card is enabled.
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.
61 * The queue is empty (no good data) if WRITE = READ - 1, and is full if
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)
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.
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.
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
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
108 * iwl_rx_queue_space - Return number of free slots available in queue.
110 int iwl_rx_queue_space(const struct iwl_rx_queue
*q
)
112 int s
= q
->read
- q
->write
;
115 /* keep some buffer to not confuse full and empty queue */
121 EXPORT_SYMBOL(iwl_rx_queue_space
);
124 * iwl_rx_queue_update_write_ptr - Update the write pointer for the RX queue
126 int iwl_rx_queue_update_write_ptr(struct iwl_priv
*priv
, struct iwl_rx_queue
*q
)
132 spin_lock_irqsave(&q
->lock
, flags
);
134 if (q
->need_update
== 0)
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
);
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
);
147 ret
= iwl_grab_nic_access(priv
);
151 /* Device expects a multiple of 8 */
152 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_WPTR
,
154 iwl_release_nic_access(priv
);
156 /* Else device is assumed to be awake */
158 /* Device expects a multiple of 8 */
159 iwl_write32(priv
, FH_RSCSR_CHNL0_WPTR
, q
->write
& ~0x7);
165 spin_unlock_irqrestore(&q
->lock
, flags
);
168 EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr
);
170 * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
172 static inline __le32
iwl_dma_addr2rbd_ptr(struct iwl_priv
*priv
,
175 return cpu_to_le32((u32
)(dma_addr
>> 8));
179 * iwl_rx_queue_restock - refill RX queue from pre-allocated pool
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.
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
189 int iwl_rx_queue_restock(struct iwl_priv
*priv
)
191 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
192 struct list_head
*element
;
193 struct iwl_rx_mem_buffer
*rxb
;
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
);
206 /* Point to Rx buffer via next RBD in circular buffer */
207 rxq
->bd
[rxq
->write
] = iwl_dma_addr2rbd_ptr(priv
, rxb
->aligned_dma_addr
);
208 rxq
->queue
[rxq
->write
] = rxb
;
209 rxq
->write
= (rxq
->write
+ 1) & RX_QUEUE_MASK
;
212 spin_unlock_irqrestore(&rxq
->lock
, flags
);
213 /* If the pre-allocated buffer pool is dropping low, schedule to
215 if (rxq
->free_count
<= RX_LOW_WATERMARK
)
216 queue_work(priv
->workqueue
, &priv
->rx_replenish
);
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
);
231 EXPORT_SYMBOL(iwl_rx_queue_restock
);
235 * iwl_rx_replenish - Move all used packet from rx_used to rx_free
237 * When moving to rx_free an SKB is allocated for the slot.
239 * Also restock the Rx queue via iwl_rx_queue_restock.
240 * This is called as a scheduled work item (except for during initialization)
242 void iwl_rx_allocate(struct iwl_priv
*priv
)
244 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
245 struct list_head
*element
;
246 struct iwl_rx_mem_buffer
*rxb
;
250 spin_lock_irqsave(&rxq
->lock
, flags
);
252 if (list_empty(&rxq
->rx_used
)) {
253 spin_unlock_irqrestore(&rxq
->lock
, flags
);
256 element
= rxq
->rx_used
.next
;
257 rxb
= list_entry(element
, struct iwl_rx_mem_buffer
, list
);
260 spin_unlock_irqrestore(&rxq
->lock
, flags
);
262 /* Alloc a new receive buffer */
263 rxb
->skb
= alloc_skb(priv
->hw_params
.rx_buf_size
+ 256,
266 printk(KERN_CRIT DRV_NAME
267 "Can not allocate SKB buffers\n");
268 /* We don't reschedule replenish work here -- we will
269 * call the restock method and if it still needs
270 * more buffers it will schedule replenish */
274 /* Get physical address of RB/SKB */
275 rxb
->real_dma_addr
= pci_map_single(
278 priv
->hw_params
.rx_buf_size
+ 256,
280 /* dma address must be no more than 36 bits */
281 BUG_ON(rxb
->real_dma_addr
& ~DMA_BIT_MASK(36));
282 /* and also 256 byte aligned! */
283 rxb
->aligned_dma_addr
= ALIGN(rxb
->real_dma_addr
, 256);
284 skb_reserve(rxb
->skb
, rxb
->aligned_dma_addr
- rxb
->real_dma_addr
);
286 spin_lock_irqsave(&rxq
->lock
, flags
);
288 list_add_tail(&rxb
->list
, &rxq
->rx_free
);
290 priv
->alloc_rxb_skb
++;
292 spin_unlock_irqrestore(&rxq
->lock
, flags
);
296 void iwl_rx_replenish(struct iwl_priv
*priv
)
300 iwl_rx_allocate(priv
);
302 spin_lock_irqsave(&priv
->lock
, flags
);
303 iwl_rx_queue_restock(priv
);
304 spin_unlock_irqrestore(&priv
->lock
, flags
);
306 EXPORT_SYMBOL(iwl_rx_replenish
);
309 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
310 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
311 * This free routine walks the list of POOL entries and if SKB is set to
312 * non NULL it is unmapped and freed
314 void iwl_rx_queue_free(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
317 for (i
= 0; i
< RX_QUEUE_SIZE
+ RX_FREE_BUFFERS
; i
++) {
318 if (rxq
->pool
[i
].skb
!= NULL
) {
319 pci_unmap_single(priv
->pci_dev
,
320 rxq
->pool
[i
].real_dma_addr
,
321 priv
->hw_params
.rx_buf_size
+ 256,
323 dev_kfree_skb(rxq
->pool
[i
].skb
);
327 pci_free_consistent(priv
->pci_dev
, 4 * RX_QUEUE_SIZE
, rxq
->bd
,
331 EXPORT_SYMBOL(iwl_rx_queue_free
);
333 int iwl_rx_queue_alloc(struct iwl_priv
*priv
)
335 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
336 struct pci_dev
*dev
= priv
->pci_dev
;
339 spin_lock_init(&rxq
->lock
);
340 INIT_LIST_HEAD(&rxq
->rx_free
);
341 INIT_LIST_HEAD(&rxq
->rx_used
);
343 /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
344 rxq
->bd
= pci_alloc_consistent(dev
, 4 * RX_QUEUE_SIZE
, &rxq
->dma_addr
);
348 /* Fill the rx_used queue with _all_ of the Rx buffers */
349 for (i
= 0; i
< RX_FREE_BUFFERS
+ RX_QUEUE_SIZE
; i
++)
350 list_add_tail(&rxq
->pool
[i
].list
, &rxq
->rx_used
);
352 /* Set us so that we have processed and used all buffers, but have
353 * not restocked the Rx queue with fresh buffers */
354 rxq
->read
= rxq
->write
= 0;
356 rxq
->need_update
= 0;
359 EXPORT_SYMBOL(iwl_rx_queue_alloc
);
361 void iwl_rx_queue_reset(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
365 spin_lock_irqsave(&rxq
->lock
, flags
);
366 INIT_LIST_HEAD(&rxq
->rx_free
);
367 INIT_LIST_HEAD(&rxq
->rx_used
);
368 /* Fill the rx_used queue with _all_ of the Rx buffers */
369 for (i
= 0; i
< RX_FREE_BUFFERS
+ RX_QUEUE_SIZE
; i
++) {
370 /* In the reset function, these buffers may have been allocated
371 * to an SKB, so we need to unmap and free potential storage */
372 if (rxq
->pool
[i
].skb
!= NULL
) {
373 pci_unmap_single(priv
->pci_dev
,
374 rxq
->pool
[i
].real_dma_addr
,
375 priv
->hw_params
.rx_buf_size
+ 256,
377 priv
->alloc_rxb_skb
--;
378 dev_kfree_skb(rxq
->pool
[i
].skb
);
379 rxq
->pool
[i
].skb
= NULL
;
381 list_add_tail(&rxq
->pool
[i
].list
, &rxq
->rx_used
);
384 /* Set us so that we have processed and used all buffers, but have
385 * not restocked the Rx queue with fresh buffers */
386 rxq
->read
= rxq
->write
= 0;
388 spin_unlock_irqrestore(&rxq
->lock
, flags
);
390 EXPORT_SYMBOL(iwl_rx_queue_reset
);
392 int iwl_rx_init(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
396 unsigned int rb_size
;
398 spin_lock_irqsave(&priv
->lock
, flags
);
399 ret
= iwl_grab_nic_access(priv
);
401 spin_unlock_irqrestore(&priv
->lock
, flags
);
405 if (priv
->cfg
->mod_params
->amsdu_size_8K
)
406 rb_size
= FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K
;
408 rb_size
= FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K
;
411 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
, 0);
413 /* Reset driver's Rx queue write index */
414 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_RBDCB_WPTR_REG
, 0);
416 /* Tell device where to find RBD circular buffer in DRAM */
417 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_RBDCB_BASE_REG
,
420 /* Tell device where in DRAM to update its Rx status */
421 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_STTS_WPTR_REG
,
422 (priv
->shared_phys
+ priv
->rb_closed_offset
) >> 4);
424 /* Enable Rx DMA, enable host interrupt, Rx buffer size 4k, 256 RBDs */
425 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
,
426 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL
|
427 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL
|
430 (RX_QUEUE_SIZE_LOG
<<
431 FH_RCSR_RX_CONFIG_RBDCB_SIZE_BITSHIFT
));
434 * iwl_write32(priv,CSR_INT_COAL_REG,0);
437 iwl_release_nic_access(priv
);
438 spin_unlock_irqrestore(&priv
->lock
, flags
);
443 int iwl_rxq_stop(struct iwl_priv
*priv
)
448 spin_lock_irqsave(&priv
->lock
, flags
);
449 ret
= iwl_grab_nic_access(priv
);
451 spin_unlock_irqrestore(&priv
->lock
, flags
);
456 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
, 0);
457 ret
= iwl_poll_direct_bit(priv
, FH_MEM_RSSR_RX_STATUS_REG
,
460 IWL_ERROR("Can't stop Rx DMA.\n");
462 iwl_release_nic_access(priv
);
463 spin_unlock_irqrestore(&priv
->lock
, flags
);
467 EXPORT_SYMBOL(iwl_rxq_stop
);
469 void iwl_rx_missed_beacon_notif(struct iwl_priv
*priv
,
470 struct iwl_rx_mem_buffer
*rxb
)
473 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
474 struct iwl4965_missed_beacon_notif
*missed_beacon
;
476 missed_beacon
= &pkt
->u
.missed_beacon
;
477 if (le32_to_cpu(missed_beacon
->consequtive_missed_beacons
) > 5) {
478 IWL_DEBUG_CALIB("missed bcn cnsq %d totl %d rcd %d expctd %d\n",
479 le32_to_cpu(missed_beacon
->consequtive_missed_beacons
),
480 le32_to_cpu(missed_beacon
->total_missed_becons
),
481 le32_to_cpu(missed_beacon
->num_recvd_beacons
),
482 le32_to_cpu(missed_beacon
->num_expected_beacons
));
483 if (!test_bit(STATUS_SCANNING
, &priv
->status
))
484 iwl_init_sensitivity(priv
);
487 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif
);
489 int iwl_rx_agg_start(struct iwl_priv
*priv
, const u8
*addr
, int tid
, u16 ssn
)
494 sta_id
= iwl_find_station(priv
, addr
);
495 if (sta_id
== IWL_INVALID_STATION
)
498 spin_lock_irqsave(&priv
->sta_lock
, flags
);
499 priv
->stations
[sta_id
].sta
.station_flags_msk
= 0;
500 priv
->stations
[sta_id
].sta
.sta
.modify_mask
= STA_MODIFY_ADDBA_TID_MSK
;
501 priv
->stations
[sta_id
].sta
.add_immediate_ba_tid
= (u8
)tid
;
502 priv
->stations
[sta_id
].sta
.add_immediate_ba_ssn
= cpu_to_le16(ssn
);
503 priv
->stations
[sta_id
].sta
.mode
= STA_CONTROL_MODIFY_MSK
;
504 spin_unlock_irqrestore(&priv
->sta_lock
, flags
);
506 return iwl_send_add_sta(priv
, &priv
->stations
[sta_id
].sta
,
509 EXPORT_SYMBOL(iwl_rx_agg_start
);
511 int iwl_rx_agg_stop(struct iwl_priv
*priv
, const u8
*addr
, int tid
)
516 sta_id
= iwl_find_station(priv
, addr
);
517 if (sta_id
== IWL_INVALID_STATION
)
520 spin_lock_irqsave(&priv
->sta_lock
, flags
);
521 priv
->stations
[sta_id
].sta
.station_flags_msk
= 0;
522 priv
->stations
[sta_id
].sta
.sta
.modify_mask
= STA_MODIFY_DELBA_TID_MSK
;
523 priv
->stations
[sta_id
].sta
.remove_immediate_ba_tid
= (u8
)tid
;
524 priv
->stations
[sta_id
].sta
.mode
= STA_CONTROL_MODIFY_MSK
;
525 spin_unlock_irqrestore(&priv
->sta_lock
, flags
);
527 return iwl_send_add_sta(priv
, &priv
->stations
[sta_id
].sta
,
530 EXPORT_SYMBOL(iwl_rx_agg_stop
);
533 /* Calculate noise level, based on measurements during network silence just
534 * before arriving beacon. This measurement can be done only if we know
535 * exactly when to expect beacons, therefore only when we're associated. */
536 static void iwl_rx_calc_noise(struct iwl_priv
*priv
)
538 struct statistics_rx_non_phy
*rx_info
539 = &(priv
->statistics
.rx
.general
);
540 int num_active_rx
= 0;
541 int total_silence
= 0;
543 le32_to_cpu(rx_info
->beacon_silence_rssi_a
) & IN_BAND_FILTER
;
545 le32_to_cpu(rx_info
->beacon_silence_rssi_b
) & IN_BAND_FILTER
;
547 le32_to_cpu(rx_info
->beacon_silence_rssi_c
) & IN_BAND_FILTER
;
550 total_silence
+= bcn_silence_a
;
554 total_silence
+= bcn_silence_b
;
558 total_silence
+= bcn_silence_c
;
562 /* Average among active antennas */
564 priv
->last_rx_noise
= (total_silence
/ num_active_rx
) - 107;
566 priv
->last_rx_noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
568 IWL_DEBUG_CALIB("inband silence a %u, b %u, c %u, dBm %d\n",
569 bcn_silence_a
, bcn_silence_b
, bcn_silence_c
,
570 priv
->last_rx_noise
);
573 #define REG_RECALIB_PERIOD (60)
575 void iwl_rx_statistics(struct iwl_priv
*priv
,
576 struct iwl_rx_mem_buffer
*rxb
)
579 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
581 IWL_DEBUG_RX("Statistics notification received (%d vs %d).\n",
582 (int)sizeof(priv
->statistics
), pkt
->len
);
584 change
= ((priv
->statistics
.general
.temperature
!=
585 pkt
->u
.stats
.general
.temperature
) ||
586 ((priv
->statistics
.flag
&
587 STATISTICS_REPLY_FLG_FAT_MODE_MSK
) !=
588 (pkt
->u
.stats
.flag
& STATISTICS_REPLY_FLG_FAT_MODE_MSK
)));
590 memcpy(&priv
->statistics
, &pkt
->u
.stats
, sizeof(priv
->statistics
));
592 set_bit(STATUS_STATISTICS
, &priv
->status
);
594 /* Reschedule the statistics timer to occur in
595 * REG_RECALIB_PERIOD seconds to ensure we get a
596 * thermal update even if the uCode doesn't give
598 mod_timer(&priv
->statistics_periodic
, jiffies
+
599 msecs_to_jiffies(REG_RECALIB_PERIOD
* 1000));
601 if (unlikely(!test_bit(STATUS_SCANNING
, &priv
->status
)) &&
602 (pkt
->hdr
.cmd
== STATISTICS_NOTIFICATION
)) {
603 iwl_rx_calc_noise(priv
);
604 queue_work(priv
->workqueue
, &priv
->run_time_calib_work
);
607 iwl_leds_background(priv
);
609 if (priv
->cfg
->ops
->lib
->temperature
&& change
)
610 priv
->cfg
->ops
->lib
->temperature(priv
);
612 EXPORT_SYMBOL(iwl_rx_statistics
);
614 #define PERFECT_RSSI (-20) /* dBm */
615 #define WORST_RSSI (-95) /* dBm */
616 #define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
618 /* Calculate an indication of rx signal quality (a percentage, not dBm!).
619 * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
620 * about formulas used below. */
621 static int iwl_calc_sig_qual(int rssi_dbm
, int noise_dbm
)
624 int degradation
= PERFECT_RSSI
- rssi_dbm
;
626 /* If we get a noise measurement, use signal-to-noise ratio (SNR)
627 * as indicator; formula is (signal dbm - noise dbm).
628 * SNR at or above 40 is a great signal (100%).
629 * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
630 * Weakest usable signal is usually 10 - 15 dB SNR. */
632 if (rssi_dbm
- noise_dbm
>= 40)
634 else if (rssi_dbm
< noise_dbm
)
636 sig_qual
= ((rssi_dbm
- noise_dbm
) * 5) / 2;
638 /* Else use just the signal level.
639 * This formula is a least squares fit of data points collected and
640 * compared with a reference system that had a percentage (%) display
641 * for signal quality. */
643 sig_qual
= (100 * (RSSI_RANGE
* RSSI_RANGE
) - degradation
*
644 (15 * RSSI_RANGE
+ 62 * degradation
)) /
645 (RSSI_RANGE
* RSSI_RANGE
);
649 else if (sig_qual
< 1)
655 #ifdef CONFIG_IWLWIFI_DEBUG
658 * iwl_dbg_report_frame - dump frame to syslog during debug sessions
660 * You may hack this function to show different aspects of received frames,
661 * including selective frame dumps.
662 * group100 parameter selects whether to show 1 out of 100 good frames.
664 * TODO: This was originally written for 3945, need to audit for
665 * proper operation with 4965.
667 static void iwl_dbg_report_frame(struct iwl_priv
*priv
,
668 struct iwl_rx_packet
*pkt
,
669 struct ieee80211_hdr
*header
, int group100
)
672 u32 print_summary
= 0;
673 u32 print_dump
= 0; /* set to 1 to dump all frames' contents */
690 struct iwl4965_rx_frame_stats
*rx_stats
= IWL_RX_STATS(pkt
);
691 struct iwl4965_rx_frame_hdr
*rx_hdr
= IWL_RX_HDR(pkt
);
692 struct iwl4965_rx_frame_end
*rx_end
= IWL_RX_END(pkt
);
693 u8
*data
= IWL_RX_DATA(pkt
);
695 if (likely(!(priv
->debug_level
& IWL_DL_RX
)))
699 fc
= header
->frame_control
;
700 seq_ctl
= le16_to_cpu(header
->seq_ctrl
);
703 channel
= le16_to_cpu(rx_hdr
->channel
);
704 phy_flags
= le16_to_cpu(rx_hdr
->phy_flags
);
705 rate_sym
= rx_hdr
->rate
;
706 length
= le16_to_cpu(rx_hdr
->len
);
708 /* end-of-frame status and timestamp */
709 status
= le32_to_cpu(rx_end
->status
);
710 bcn_tmr
= le32_to_cpu(rx_end
->beacon_timestamp
);
711 tsf_low
= le64_to_cpu(rx_end
->timestamp
) & 0x0ffffffff;
712 tsf
= le64_to_cpu(rx_end
->timestamp
);
714 /* signal statistics */
715 rssi
= rx_stats
->rssi
;
717 sig_avg
= le16_to_cpu(rx_stats
->sig_avg
);
718 noise_diff
= le16_to_cpu(rx_stats
->noise_diff
);
720 to_us
= !compare_ether_addr(header
->addr1
, priv
->mac_addr
);
722 /* if data frame is to us and all is good,
723 * (optionally) print summary for only 1 out of every 100 */
724 if (to_us
&& (fc
& ~cpu_to_le16(IEEE80211_FCTL_PROTECTED
)) ==
725 cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FTYPE_DATA
)) {
728 print_summary
= 1; /* print each frame */
729 else if (priv
->framecnt_to_us
< 100) {
730 priv
->framecnt_to_us
++;
733 priv
->framecnt_to_us
= 0;
738 /* print summary for all other frames */
749 else if (ieee80211_has_retry(fc
))
751 else if (ieee80211_is_assoc_resp(fc
))
753 else if (ieee80211_is_reassoc_resp(fc
))
755 else if (ieee80211_is_probe_resp(fc
)) {
757 print_dump
= 1; /* dump frame contents */
758 } else if (ieee80211_is_beacon(fc
)) {
760 print_dump
= 1; /* dump frame contents */
761 } else if (ieee80211_is_atim(fc
))
763 else if (ieee80211_is_auth(fc
))
765 else if (ieee80211_is_deauth(fc
))
767 else if (ieee80211_is_disassoc(fc
))
772 rate_idx
= iwl_hwrate_to_plcp_idx(rate_sym
);
773 if (unlikely(rate_idx
== -1))
776 bitrate
= iwl_rates
[rate_idx
].ieee
/ 2;
778 /* print frame summary.
779 * MAC addresses show just the last byte (for brevity),
780 * but you can hack it to show more, if you'd like to. */
782 IWL_DEBUG_RX("%s: mhd=0x%04x, dst=0x%02x, "
783 "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
784 title
, le16_to_cpu(fc
), header
->addr1
[5],
785 length
, rssi
, channel
, bitrate
);
787 /* src/dst addresses assume managed mode */
788 IWL_DEBUG_RX("%s: 0x%04x, dst=0x%02x, "
789 "src=0x%02x, rssi=%u, tim=%lu usec, "
790 "phy=0x%02x, chnl=%d\n",
791 title
, le16_to_cpu(fc
), header
->addr1
[5],
792 header
->addr3
[5], rssi
,
793 tsf_low
- priv
->scan_start_tsf
,
798 iwl_print_hex_dump(priv
, IWL_DL_RX
, data
, length
);
801 static inline void iwl_dbg_report_frame(struct iwl_priv
*priv
,
802 struct iwl_rx_packet
*pkt
,
803 struct ieee80211_hdr
*header
,
809 static void iwl_add_radiotap(struct iwl_priv
*priv
,
811 struct iwl_rx_phy_res
*rx_start
,
812 struct ieee80211_rx_status
*stats
,
815 s8 signal
= stats
->signal
;
817 int rate
= stats
->rate_idx
;
818 u64 tsf
= stats
->mactime
;
820 __le16 phy_flags_hw
= rx_start
->phy_flags
;
821 struct iwl4965_rt_rx_hdr
{
822 struct ieee80211_radiotap_header rt_hdr
;
823 __le64 rt_tsf
; /* TSF */
824 u8 rt_flags
; /* radiotap packet flags */
825 u8 rt_rate
; /* rate in 500kb/s */
826 __le16 rt_channelMHz
; /* channel in MHz */
827 __le16 rt_chbitmask
; /* channel bitfield */
828 s8 rt_dbmsignal
; /* signal in dBm, kluged to signed */
830 u8 rt_antenna
; /* antenna number */
831 } __attribute__ ((packed
)) *iwl4965_rt
;
833 /* TODO: We won't have enough headroom for HT frames. Fix it later. */
834 if (skb_headroom(skb
) < sizeof(*iwl4965_rt
)) {
836 printk(KERN_ERR
"not enough headroom [%d] for "
837 "radiotap head [%zd]\n",
838 skb_headroom(skb
), sizeof(*iwl4965_rt
));
842 /* put radiotap header in front of 802.11 header and data */
843 iwl4965_rt
= (void *)skb_push(skb
, sizeof(*iwl4965_rt
));
845 /* initialise radiotap header */
846 iwl4965_rt
->rt_hdr
.it_version
= PKTHDR_RADIOTAP_VERSION
;
847 iwl4965_rt
->rt_hdr
.it_pad
= 0;
849 /* total header + data */
850 put_unaligned_le16(sizeof(*iwl4965_rt
), &iwl4965_rt
->rt_hdr
.it_len
);
852 /* Indicate all the fields we add to the radiotap header */
853 put_unaligned_le32((1 << IEEE80211_RADIOTAP_TSFT
) |
854 (1 << IEEE80211_RADIOTAP_FLAGS
) |
855 (1 << IEEE80211_RADIOTAP_RATE
) |
856 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
857 (1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
) |
858 (1 << IEEE80211_RADIOTAP_DBM_ANTNOISE
) |
859 (1 << IEEE80211_RADIOTAP_ANTENNA
),
860 &(iwl4965_rt
->rt_hdr
.it_present
));
862 /* Zero the flags, we'll add to them as we go */
863 iwl4965_rt
->rt_flags
= 0;
865 put_unaligned_le64(tsf
, &iwl4965_rt
->rt_tsf
);
867 iwl4965_rt
->rt_dbmsignal
= signal
;
868 iwl4965_rt
->rt_dbmnoise
= noise
;
870 /* Convert the channel frequency and set the flags */
871 put_unaligned(cpu_to_le16(stats
->freq
), &iwl4965_rt
->rt_channelMHz
);
872 if (!(phy_flags_hw
& RX_RES_PHY_FLAGS_BAND_24_MSK
))
873 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
,
874 &iwl4965_rt
->rt_chbitmask
);
875 else if (phy_flags_hw
& RX_RES_PHY_FLAGS_MOD_CCK_MSK
)
876 put_unaligned_le16(IEEE80211_CHAN_CCK
| IEEE80211_CHAN_2GHZ
,
877 &iwl4965_rt
->rt_chbitmask
);
879 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
,
880 &iwl4965_rt
->rt_chbitmask
);
883 iwl4965_rt
->rt_rate
= 0;
885 iwl4965_rt
->rt_rate
= iwl_rates
[rate
].ieee
;
890 * It seems that the antenna field in the phy flags value
891 * is actually a bitfield. This is undefined by radiotap,
892 * it wants an actual antenna number but I always get "7"
893 * for most legacy frames I receive indicating that the
894 * same frame was received on all three RX chains.
896 * I think this field should be removed in favour of a
897 * new 802.11n radiotap field "RX chains" that is defined
900 antenna
= phy_flags_hw
& RX_RES_PHY_FLAGS_ANTENNA_MSK
;
901 iwl4965_rt
->rt_antenna
= le16_to_cpu(antenna
) >> 4;
903 /* set the preamble flag if appropriate */
904 if (phy_flags_hw
& RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK
)
905 iwl4965_rt
->rt_flags
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
907 stats
->flag
|= RX_FLAG_RADIOTAP
;
910 static void iwl_update_rx_stats(struct iwl_priv
*priv
, u16 fc
, u16 len
)
912 /* 0 - mgmt, 1 - cnt, 2 - data */
913 int idx
= (fc
& IEEE80211_FCTL_FTYPE
) >> 2;
914 priv
->rx_stats
[idx
].cnt
++;
915 priv
->rx_stats
[idx
].bytes
+= len
;
919 * returns non-zero if packet should be dropped
921 static int iwl_set_decrypted_flag(struct iwl_priv
*priv
,
922 struct ieee80211_hdr
*hdr
,
924 struct ieee80211_rx_status
*stats
)
926 u16 fc
= le16_to_cpu(hdr
->frame_control
);
928 if (priv
->active_rxon
.filter_flags
& RXON_FILTER_DIS_DECRYPT_MSK
)
931 if (!(fc
& IEEE80211_FCTL_PROTECTED
))
934 IWL_DEBUG_RX("decrypt_res:0x%x\n", decrypt_res
);
935 switch (decrypt_res
& RX_RES_STATUS_SEC_TYPE_MSK
) {
936 case RX_RES_STATUS_SEC_TYPE_TKIP
:
937 /* The uCode has got a bad phase 1 Key, pushes the packet.
938 * Decryption will be done in SW. */
939 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
940 RX_RES_STATUS_BAD_KEY_TTAK
)
943 case RX_RES_STATUS_SEC_TYPE_WEP
:
944 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
945 RX_RES_STATUS_BAD_ICV_MIC
) {
946 /* bad ICV, the packet is destroyed since the
947 * decryption is inplace, drop it */
948 IWL_DEBUG_RX("Packet destroyed\n");
951 case RX_RES_STATUS_SEC_TYPE_CCMP
:
952 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
953 RX_RES_STATUS_DECRYPT_OK
) {
954 IWL_DEBUG_RX("hw decrypt successfully!!!\n");
955 stats
->flag
|= RX_FLAG_DECRYPTED
;
965 static u32
iwl_translate_rx_status(struct iwl_priv
*priv
, u32 decrypt_in
)
969 if ((decrypt_in
& RX_RES_STATUS_STATION_FOUND
) ==
970 RX_RES_STATUS_STATION_FOUND
)
971 decrypt_out
|= (RX_RES_STATUS_STATION_FOUND
|
972 RX_RES_STATUS_NO_STATION_INFO_MISMATCH
);
974 decrypt_out
|= (decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
);
976 /* packet was not encrypted */
977 if ((decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) ==
978 RX_RES_STATUS_SEC_TYPE_NONE
)
981 /* packet was encrypted with unknown alg */
982 if ((decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) ==
983 RX_RES_STATUS_SEC_TYPE_ERR
)
986 /* decryption was not done in HW */
987 if ((decrypt_in
& RX_MPDU_RES_STATUS_DEC_DONE_MSK
) !=
988 RX_MPDU_RES_STATUS_DEC_DONE_MSK
)
991 switch (decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) {
993 case RX_RES_STATUS_SEC_TYPE_CCMP
:
994 /* alg is CCM: check MIC only */
995 if (!(decrypt_in
& RX_MPDU_RES_STATUS_MIC_OK
))
997 decrypt_out
|= RX_RES_STATUS_BAD_ICV_MIC
;
999 decrypt_out
|= RX_RES_STATUS_DECRYPT_OK
;
1003 case RX_RES_STATUS_SEC_TYPE_TKIP
:
1004 if (!(decrypt_in
& RX_MPDU_RES_STATUS_TTAK_OK
)) {
1006 decrypt_out
|= RX_RES_STATUS_BAD_KEY_TTAK
;
1009 /* fall through if TTAK OK */
1011 if (!(decrypt_in
& RX_MPDU_RES_STATUS_ICV_OK
))
1012 decrypt_out
|= RX_RES_STATUS_BAD_ICV_MIC
;
1014 decrypt_out
|= RX_RES_STATUS_DECRYPT_OK
;
1018 IWL_DEBUG_RX("decrypt_in:0x%x decrypt_out = 0x%x\n",
1019 decrypt_in
, decrypt_out
);
1024 static void iwl_pass_packet_to_mac80211(struct iwl_priv
*priv
,
1026 struct iwl_rx_mem_buffer
*rxb
,
1027 struct ieee80211_rx_status
*stats
)
1029 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
1030 struct iwl_rx_phy_res
*rx_start
= (include_phy
) ?
1031 (struct iwl_rx_phy_res
*)&(pkt
->u
.raw
[0]) : NULL
;
1032 struct ieee80211_hdr
*hdr
;
1035 unsigned int skblen
;
1037 u32 ampdu_status_legacy
;
1039 if (!include_phy
&& priv
->last_phy_res
[0])
1040 rx_start
= (struct iwl_rx_phy_res
*)&priv
->last_phy_res
[1];
1043 IWL_ERROR("MPDU frame without a PHY data\n");
1047 hdr
= (struct ieee80211_hdr
*)((u8
*) &rx_start
[1] +
1048 rx_start
->cfg_phy_cnt
);
1050 len
= le16_to_cpu(rx_start
->byte_count
);
1052 rx_end
= (__le32
*)((u8
*) &pkt
->u
.raw
[0] +
1053 sizeof(struct iwl_rx_phy_res
) +
1054 rx_start
->cfg_phy_cnt
+ len
);
1057 struct iwl4965_rx_mpdu_res_start
*amsdu
=
1058 (struct iwl4965_rx_mpdu_res_start
*)pkt
->u
.raw
;
1060 hdr
= (struct ieee80211_hdr
*)(pkt
->u
.raw
+
1061 sizeof(struct iwl4965_rx_mpdu_res_start
));
1062 len
= le16_to_cpu(amsdu
->byte_count
);
1063 rx_start
->byte_count
= amsdu
->byte_count
;
1064 rx_end
= (__le32
*) (((u8
*) hdr
) + len
);
1067 ampdu_status
= le32_to_cpu(*rx_end
);
1068 skblen
= ((u8
*) rx_end
- (u8
*) &pkt
->u
.raw
[0]) + sizeof(u32
);
1071 /* New status scheme, need to translate */
1072 ampdu_status_legacy
= ampdu_status
;
1073 ampdu_status
= iwl_translate_rx_status(priv
, ampdu_status
);
1076 /* start from MAC */
1077 skb_reserve(rxb
->skb
, (void *)hdr
- (void *)pkt
);
1078 skb_put(rxb
->skb
, len
); /* end where data ends */
1080 /* We only process data packets if the interface is open */
1081 if (unlikely(!priv
->is_open
)) {
1082 IWL_DEBUG_DROP_LIMIT
1083 ("Dropping packet while interface is not open.\n");
1087 hdr
= (struct ieee80211_hdr
*)rxb
->skb
->data
;
1089 /* in case of HW accelerated crypto and bad decryption, drop */
1090 if (!priv
->hw_params
.sw_crypto
&&
1091 iwl_set_decrypted_flag(priv
, hdr
, ampdu_status
, stats
))
1094 if (priv
->add_radiotap
)
1095 iwl_add_radiotap(priv
, rxb
->skb
, rx_start
, stats
, ampdu_status
);
1097 iwl_update_rx_stats(priv
, le16_to_cpu(hdr
->frame_control
), len
);
1098 ieee80211_rx_irqsafe(priv
->hw
, rxb
->skb
, stats
);
1099 priv
->alloc_rxb_skb
--;
1103 /* Calc max signal level (dBm) among 3 possible receivers */
1104 static inline int iwl_calc_rssi(struct iwl_priv
*priv
,
1105 struct iwl_rx_phy_res
*rx_resp
)
1107 return priv
->cfg
->ops
->utils
->calc_rssi(priv
, rx_resp
);
1111 static void iwl_sta_modify_ps_wake(struct iwl_priv
*priv
, int sta_id
)
1113 unsigned long flags
;
1115 spin_lock_irqsave(&priv
->sta_lock
, flags
);
1116 priv
->stations
[sta_id
].sta
.station_flags
&= ~STA_FLG_PWR_SAVE_MSK
;
1117 priv
->stations
[sta_id
].sta
.station_flags_msk
= STA_FLG_PWR_SAVE_MSK
;
1118 priv
->stations
[sta_id
].sta
.sta
.modify_mask
= 0;
1119 priv
->stations
[sta_id
].sta
.mode
= STA_CONTROL_MODIFY_MSK
;
1120 spin_unlock_irqrestore(&priv
->sta_lock
, flags
);
1122 iwl_send_add_sta(priv
, &priv
->stations
[sta_id
].sta
, CMD_ASYNC
);
1125 static void iwl_update_ps_mode(struct iwl_priv
*priv
, u16 ps_bit
, u8
*addr
)
1127 /* FIXME: need locking over ps_status ??? */
1128 u8 sta_id
= iwl_find_station(priv
, addr
);
1130 if (sta_id
!= IWL_INVALID_STATION
) {
1131 u8 sta_awake
= priv
->stations
[sta_id
].
1132 ps_status
== STA_PS_STATUS_WAKE
;
1134 if (sta_awake
&& ps_bit
)
1135 priv
->stations
[sta_id
].ps_status
= STA_PS_STATUS_SLEEP
;
1136 else if (!sta_awake
&& !ps_bit
) {
1137 iwl_sta_modify_ps_wake(priv
, sta_id
);
1138 priv
->stations
[sta_id
].ps_status
= STA_PS_STATUS_WAKE
;
1143 /* This is necessary only for a number of statistics, see the caller. */
1144 static int iwl_is_network_packet(struct iwl_priv
*priv
,
1145 struct ieee80211_hdr
*header
)
1147 /* Filter incoming packets to determine if they are targeted toward
1148 * this network, discarding packets coming from ourselves */
1149 switch (priv
->iw_mode
) {
1150 case IEEE80211_IF_TYPE_IBSS
: /* Header: Dest. | Source | BSSID */
1151 /* packets to our IBSS update information */
1152 return !compare_ether_addr(header
->addr3
, priv
->bssid
);
1153 case IEEE80211_IF_TYPE_STA
: /* Header: Dest. | AP{BSSID} | Source */
1154 /* packets to our IBSS update information */
1155 return !compare_ether_addr(header
->addr2
, priv
->bssid
);
1161 /* Called for REPLY_RX (legacy ABG frames), or
1162 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
1163 void iwl_rx_reply_rx(struct iwl_priv
*priv
,
1164 struct iwl_rx_mem_buffer
*rxb
)
1166 struct ieee80211_hdr
*header
;
1167 struct ieee80211_rx_status rx_status
;
1168 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
1169 /* Use phy data (Rx signal strength, etc.) contained within
1170 * this rx packet for legacy frames,
1171 * or phy data cached from REPLY_RX_PHY_CMD for HT frames. */
1172 int include_phy
= (pkt
->hdr
.cmd
== REPLY_RX
);
1173 struct iwl_rx_phy_res
*rx_start
= (include_phy
) ?
1174 (struct iwl_rx_phy_res
*)&(pkt
->u
.raw
[0]) :
1175 (struct iwl_rx_phy_res
*)&priv
->last_phy_res
[1];
1177 unsigned int len
= 0;
1181 rx_status
.mactime
= le64_to_cpu(rx_start
->timestamp
);
1183 ieee80211_channel_to_frequency(le16_to_cpu(rx_start
->channel
));
1184 rx_status
.band
= (rx_start
->phy_flags
& RX_RES_PHY_FLAGS_BAND_24_MSK
) ?
1185 IEEE80211_BAND_2GHZ
: IEEE80211_BAND_5GHZ
;
1186 rx_status
.rate_idx
=
1187 iwl_hwrate_to_plcp_idx(le32_to_cpu(rx_start
->rate_n_flags
));
1188 if (rx_status
.band
== IEEE80211_BAND_5GHZ
)
1189 rx_status
.rate_idx
-= IWL_FIRST_OFDM_RATE
;
1191 rx_status
.antenna
= 0;
1194 /* TSF isn't reliable. In order to allow smooth user experience,
1195 * this W/A doesn't propagate it to the mac80211 */
1196 /*rx_status.flag |= RX_FLAG_TSFT;*/
1198 if ((unlikely(rx_start
->cfg_phy_cnt
> 20))) {
1199 IWL_DEBUG_DROP("dsp size out of range [0,20]: %d/n",
1200 rx_start
->cfg_phy_cnt
);
1205 if (priv
->last_phy_res
[0])
1206 rx_start
= (struct iwl_rx_phy_res
*)
1207 &priv
->last_phy_res
[1];
1213 IWL_ERROR("MPDU frame without a PHY data\n");
1218 header
= (struct ieee80211_hdr
*)((u8
*) &rx_start
[1]
1219 + rx_start
->cfg_phy_cnt
);
1221 len
= le16_to_cpu(rx_start
->byte_count
);
1222 rx_end
= (__le32
*)(pkt
->u
.raw
+ rx_start
->cfg_phy_cnt
+
1223 sizeof(struct iwl_rx_phy_res
) + len
);
1225 struct iwl4965_rx_mpdu_res_start
*amsdu
=
1226 (struct iwl4965_rx_mpdu_res_start
*)pkt
->u
.raw
;
1228 header
= (void *)(pkt
->u
.raw
+
1229 sizeof(struct iwl4965_rx_mpdu_res_start
));
1230 len
= le16_to_cpu(amsdu
->byte_count
);
1231 rx_end
= (__le32
*) (pkt
->u
.raw
+
1232 sizeof(struct iwl4965_rx_mpdu_res_start
) + len
);
1235 if (!(*rx_end
& RX_RES_STATUS_NO_CRC32_ERROR
) ||
1236 !(*rx_end
& RX_RES_STATUS_NO_RXE_OVERFLOW
)) {
1237 IWL_DEBUG_RX("Bad CRC or FIFO: 0x%08X.\n",
1238 le32_to_cpu(*rx_end
));
1242 priv
->ucode_beacon_time
= le32_to_cpu(rx_start
->beacon_time_stamp
);
1244 /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1245 rx_status
.signal
= iwl_calc_rssi(priv
, rx_start
);
1247 /* Meaningful noise values are available only from beacon statistics,
1248 * which are gathered only when associated, and indicate noise
1249 * only for the associated network channel ...
1250 * Ignore these noise values while scanning (other channels) */
1251 if (iwl_is_associated(priv
) &&
1252 !test_bit(STATUS_SCANNING
, &priv
->status
)) {
1253 rx_status
.noise
= priv
->last_rx_noise
;
1254 rx_status
.qual
= iwl_calc_sig_qual(rx_status
.signal
,
1257 rx_status
.noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
1258 rx_status
.qual
= iwl_calc_sig_qual(rx_status
.signal
, 0);
1261 /* Reset beacon noise level if not associated. */
1262 if (!iwl_is_associated(priv
))
1263 priv
->last_rx_noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
1265 /* Set "1" to report good data frames in groups of 100 */
1266 /* FIXME: need to optimze the call: */
1267 iwl_dbg_report_frame(priv
, pkt
, header
, 1);
1269 IWL_DEBUG_STATS_LIMIT("Rssi %d, noise %d, qual %d, TSF %llu\n",
1270 rx_status
.signal
, rx_status
.noise
, rx_status
.signal
,
1271 (unsigned long long)rx_status
.mactime
);
1273 /* Take shortcut when only in monitor mode */
1274 if (priv
->iw_mode
== IEEE80211_IF_TYPE_MNTR
) {
1275 iwl_pass_packet_to_mac80211(priv
, include_phy
,
1280 network_packet
= iwl_is_network_packet(priv
, header
);
1281 if (network_packet
) {
1282 priv
->last_rx_rssi
= rx_status
.signal
;
1283 priv
->last_beacon_time
= priv
->ucode_beacon_time
;
1284 priv
->last_tsf
= le64_to_cpu(rx_start
->timestamp
);
1287 fc
= le16_to_cpu(header
->frame_control
);
1288 switch (fc
& IEEE80211_FCTL_FTYPE
) {
1289 case IEEE80211_FTYPE_MGMT
:
1290 case IEEE80211_FTYPE_DATA
:
1291 if (priv
->iw_mode
== IEEE80211_IF_TYPE_AP
)
1292 iwl_update_ps_mode(priv
, fc
& IEEE80211_FCTL_PM
,
1296 iwl_pass_packet_to_mac80211(priv
, include_phy
, rxb
,
1302 EXPORT_SYMBOL(iwl_rx_reply_rx
);
1304 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1305 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1306 void iwl_rx_reply_rx_phy(struct iwl_priv
*priv
,
1307 struct iwl_rx_mem_buffer
*rxb
)
1309 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
1310 priv
->last_phy_res
[0] = 1;
1311 memcpy(&priv
->last_phy_res
[1], &(pkt
->u
.raw
[0]),
1312 sizeof(struct iwl_rx_phy_res
));
1314 EXPORT_SYMBOL(iwl_rx_reply_rx_phy
);