1 /******************************************************************************
3 * Copyright(c) 2003 - 2009 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 * Intel Linux Wireless <ilw@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
)
129 u32 rx_wrt_ptr_reg
= priv
->hw_params
.rx_wrt_ptr_reg
;
133 spin_lock_irqsave(&q
->lock
, flags
);
135 if (q
->need_update
== 0)
138 /* If power-saving is in use, make sure device is awake */
139 if (test_bit(STATUS_POWER_PMI
, &priv
->status
)) {
140 reg
= iwl_read32(priv
, CSR_UCODE_DRV_GP1
);
142 if (reg
& CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP
) {
143 iwl_set_bit(priv
, CSR_GP_CNTRL
,
144 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ
);
148 q
->write_actual
= (q
->write
& ~0x7);
149 iwl_write_direct32(priv
, rx_wrt_ptr_reg
, q
->write_actual
);
151 /* Else device is assumed to be awake */
153 /* Device expects a multiple of 8 */
154 q
->write_actual
= (q
->write
& ~0x7);
155 iwl_write_direct32(priv
, rx_wrt_ptr_reg
, q
->write_actual
);
161 spin_unlock_irqrestore(&q
->lock
, flags
);
164 EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr
);
166 * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
168 static inline __le32
iwl_dma_addr2rbd_ptr(struct iwl_priv
*priv
,
171 return cpu_to_le32((u32
)(dma_addr
>> 8));
175 * iwl_rx_queue_restock - refill RX queue from pre-allocated pool
177 * If there are slots in the RX queue that need to be restocked,
178 * and we have free pre-allocated buffers, fill the ranks as much
179 * as we can, pulling from rx_free.
181 * This moves the 'write' index forward to catch up with 'processed', and
182 * also updates the memory address in the firmware to reference the new
185 int iwl_rx_queue_restock(struct iwl_priv
*priv
)
187 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
188 struct list_head
*element
;
189 struct iwl_rx_mem_buffer
*rxb
;
194 spin_lock_irqsave(&rxq
->lock
, flags
);
195 write
= rxq
->write
& ~0x7;
196 while ((iwl_rx_queue_space(rxq
) > 0) && (rxq
->free_count
)) {
197 /* Get next free Rx buffer, remove from free list */
198 element
= rxq
->rx_free
.next
;
199 rxb
= list_entry(element
, struct iwl_rx_mem_buffer
, list
);
202 /* Point to Rx buffer via next RBD in circular buffer */
203 rxq
->bd
[rxq
->write
] = iwl_dma_addr2rbd_ptr(priv
, rxb
->page_dma
);
204 rxq
->queue
[rxq
->write
] = rxb
;
205 rxq
->write
= (rxq
->write
+ 1) & RX_QUEUE_MASK
;
208 spin_unlock_irqrestore(&rxq
->lock
, flags
);
209 /* If the pre-allocated buffer pool is dropping low, schedule to
211 if (rxq
->free_count
<= RX_LOW_WATERMARK
)
212 queue_work(priv
->workqueue
, &priv
->rx_replenish
);
215 /* If we've added more space for the firmware to place data, tell it.
216 * Increment device's write pointer in multiples of 8. */
217 if (rxq
->write_actual
!= (rxq
->write
& ~0x7)) {
218 spin_lock_irqsave(&rxq
->lock
, flags
);
219 rxq
->need_update
= 1;
220 spin_unlock_irqrestore(&rxq
->lock
, flags
);
221 ret
= iwl_rx_queue_update_write_ptr(priv
, rxq
);
226 EXPORT_SYMBOL(iwl_rx_queue_restock
);
230 * iwl_rx_replenish - Move all used packet from rx_used to rx_free
232 * When moving to rx_free an SKB is allocated for the slot.
234 * Also restock the Rx queue via iwl_rx_queue_restock.
235 * This is called as a scheduled work item (except for during initialization)
237 void iwl_rx_allocate(struct iwl_priv
*priv
, gfp_t priority
)
239 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
240 struct list_head
*element
;
241 struct iwl_rx_mem_buffer
*rxb
;
244 gfp_t gfp_mask
= priority
;
247 spin_lock_irqsave(&rxq
->lock
, flags
);
248 if (list_empty(&rxq
->rx_used
)) {
249 spin_unlock_irqrestore(&rxq
->lock
, flags
);
252 spin_unlock_irqrestore(&rxq
->lock
, flags
);
254 if (rxq
->free_count
> RX_LOW_WATERMARK
)
255 gfp_mask
|= __GFP_NOWARN
;
257 if (priv
->hw_params
.rx_page_order
> 0)
258 gfp_mask
|= __GFP_COMP
;
260 /* Alloc a new receive buffer */
261 page
= alloc_pages(gfp_mask
, priv
->hw_params
.rx_page_order
);
264 IWL_DEBUG_INFO(priv
, "alloc_pages failed, "
266 priv
->hw_params
.rx_page_order
);
268 if ((rxq
->free_count
<= RX_LOW_WATERMARK
) &&
270 IWL_CRIT(priv
, "Failed to alloc_pages with %s. Only %u free buffers remaining.\n",
271 priority
== GFP_ATOMIC
? "GFP_ATOMIC" : "GFP_KERNEL",
273 /* We don't reschedule replenish work here -- we will
274 * call the restock method and if it still needs
275 * more buffers it will schedule replenish */
279 spin_lock_irqsave(&rxq
->lock
, flags
);
281 if (list_empty(&rxq
->rx_used
)) {
282 spin_unlock_irqrestore(&rxq
->lock
, flags
);
283 __free_pages(page
, priv
->hw_params
.rx_page_order
);
286 element
= rxq
->rx_used
.next
;
287 rxb
= list_entry(element
, struct iwl_rx_mem_buffer
, list
);
290 spin_unlock_irqrestore(&rxq
->lock
, flags
);
293 /* Get physical address of the RB */
294 rxb
->page_dma
= pci_map_page(priv
->pci_dev
, page
, 0,
295 PAGE_SIZE
<< priv
->hw_params
.rx_page_order
,
297 /* dma address must be no more than 36 bits */
298 BUG_ON(rxb
->page_dma
& ~DMA_BIT_MASK(36));
299 /* and also 256 byte aligned! */
300 BUG_ON(rxb
->page_dma
& DMA_BIT_MASK(8));
302 spin_lock_irqsave(&rxq
->lock
, flags
);
304 list_add_tail(&rxb
->list
, &rxq
->rx_free
);
306 priv
->alloc_rxb_page
++;
308 spin_unlock_irqrestore(&rxq
->lock
, flags
);
312 void iwl_rx_replenish(struct iwl_priv
*priv
)
316 iwl_rx_allocate(priv
, GFP_KERNEL
);
318 spin_lock_irqsave(&priv
->lock
, flags
);
319 iwl_rx_queue_restock(priv
);
320 spin_unlock_irqrestore(&priv
->lock
, flags
);
322 EXPORT_SYMBOL(iwl_rx_replenish
);
324 void iwl_rx_replenish_now(struct iwl_priv
*priv
)
326 iwl_rx_allocate(priv
, GFP_ATOMIC
);
328 iwl_rx_queue_restock(priv
);
330 EXPORT_SYMBOL(iwl_rx_replenish_now
);
333 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
334 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
335 * This free routine walks the list of POOL entries and if SKB is set to
336 * non NULL it is unmapped and freed
338 void iwl_rx_queue_free(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
341 for (i
= 0; i
< RX_QUEUE_SIZE
+ RX_FREE_BUFFERS
; i
++) {
342 if (rxq
->pool
[i
].page
!= NULL
) {
343 pci_unmap_page(priv
->pci_dev
, rxq
->pool
[i
].page_dma
,
344 PAGE_SIZE
<< priv
->hw_params
.rx_page_order
,
346 __free_pages(rxq
->pool
[i
].page
,
347 priv
->hw_params
.rx_page_order
);
348 rxq
->pool
[i
].page
= NULL
;
349 priv
->alloc_rxb_page
--;
353 pci_free_consistent(priv
->pci_dev
, 4 * RX_QUEUE_SIZE
, rxq
->bd
,
355 pci_free_consistent(priv
->pci_dev
, sizeof(struct iwl_rb_status
),
356 rxq
->rb_stts
, rxq
->rb_stts_dma
);
360 EXPORT_SYMBOL(iwl_rx_queue_free
);
362 int iwl_rx_queue_alloc(struct iwl_priv
*priv
)
364 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
365 struct pci_dev
*dev
= priv
->pci_dev
;
368 spin_lock_init(&rxq
->lock
);
369 INIT_LIST_HEAD(&rxq
->rx_free
);
370 INIT_LIST_HEAD(&rxq
->rx_used
);
372 /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
373 rxq
->bd
= pci_alloc_consistent(dev
, 4 * RX_QUEUE_SIZE
, &rxq
->dma_addr
);
377 rxq
->rb_stts
= pci_alloc_consistent(dev
, sizeof(struct iwl_rb_status
),
382 /* Fill the rx_used queue with _all_ of the Rx buffers */
383 for (i
= 0; i
< RX_FREE_BUFFERS
+ RX_QUEUE_SIZE
; i
++)
384 list_add_tail(&rxq
->pool
[i
].list
, &rxq
->rx_used
);
386 /* Set us so that we have processed and used all buffers, but have
387 * not restocked the Rx queue with fresh buffers */
388 rxq
->read
= rxq
->write
= 0;
389 rxq
->write_actual
= 0;
391 rxq
->need_update
= 0;
395 pci_free_consistent(priv
->pci_dev
, 4 * RX_QUEUE_SIZE
, rxq
->bd
,
400 EXPORT_SYMBOL(iwl_rx_queue_alloc
);
402 void iwl_rx_queue_reset(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
406 spin_lock_irqsave(&rxq
->lock
, flags
);
407 INIT_LIST_HEAD(&rxq
->rx_free
);
408 INIT_LIST_HEAD(&rxq
->rx_used
);
409 /* Fill the rx_used queue with _all_ of the Rx buffers */
410 for (i
= 0; i
< RX_FREE_BUFFERS
+ RX_QUEUE_SIZE
; i
++) {
411 /* In the reset function, these buffers may have been allocated
412 * to an SKB, so we need to unmap and free potential storage */
413 if (rxq
->pool
[i
].page
!= NULL
) {
414 pci_unmap_page(priv
->pci_dev
, rxq
->pool
[i
].page_dma
,
415 PAGE_SIZE
<< priv
->hw_params
.rx_page_order
,
417 priv
->alloc_rxb_page
--;
418 __free_pages(rxq
->pool
[i
].page
,
419 priv
->hw_params
.rx_page_order
);
420 rxq
->pool
[i
].page
= NULL
;
422 list_add_tail(&rxq
->pool
[i
].list
, &rxq
->rx_used
);
425 /* Set us so that we have processed and used all buffers, but have
426 * not restocked the Rx queue with fresh buffers */
427 rxq
->read
= rxq
->write
= 0;
428 rxq
->write_actual
= 0;
430 spin_unlock_irqrestore(&rxq
->lock
, flags
);
433 int iwl_rx_init(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
436 const u32 rfdnlog
= RX_QUEUE_SIZE_LOG
; /* 256 RBDs */
437 u32 rb_timeout
= 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
439 if (!priv
->cfg
->use_isr_legacy
)
440 rb_timeout
= RX_RB_TIMEOUT
;
442 if (priv
->cfg
->mod_params
->amsdu_size_8K
)
443 rb_size
= FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K
;
445 rb_size
= FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K
;
448 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
, 0);
450 /* Reset driver's Rx queue write index */
451 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_RBDCB_WPTR_REG
, 0);
453 /* Tell device where to find RBD circular buffer in DRAM */
454 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_RBDCB_BASE_REG
,
455 (u32
)(rxq
->dma_addr
>> 8));
457 /* Tell device where in DRAM to update its Rx status */
458 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_STTS_WPTR_REG
,
459 rxq
->rb_stts_dma
>> 4);
462 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
463 * the credit mechanism in 5000 HW RX FIFO
464 * Direct rx interrupts to hosts
465 * Rx buffer size 4 or 8k
469 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
,
470 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL
|
471 FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY
|
472 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL
|
473 FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK
|
475 (rb_timeout
<< FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS
)|
476 (rfdnlog
<< FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS
));
478 iwl_write32(priv
, CSR_INT_COALESCING
, 0x40);
483 int iwl_rxq_stop(struct iwl_priv
*priv
)
487 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
, 0);
488 iwl_poll_direct_bit(priv
, FH_MEM_RSSR_RX_STATUS_REG
,
489 FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE
, 1000);
493 EXPORT_SYMBOL(iwl_rxq_stop
);
495 void iwl_rx_missed_beacon_notif(struct iwl_priv
*priv
,
496 struct iwl_rx_mem_buffer
*rxb
)
499 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
500 struct iwl_missed_beacon_notif
*missed_beacon
;
502 missed_beacon
= &pkt
->u
.missed_beacon
;
503 if (le32_to_cpu(missed_beacon
->consequtive_missed_beacons
) > 5) {
504 IWL_DEBUG_CALIB(priv
, "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
505 le32_to_cpu(missed_beacon
->consequtive_missed_beacons
),
506 le32_to_cpu(missed_beacon
->total_missed_becons
),
507 le32_to_cpu(missed_beacon
->num_recvd_beacons
),
508 le32_to_cpu(missed_beacon
->num_expected_beacons
));
509 if (!test_bit(STATUS_SCANNING
, &priv
->status
))
510 iwl_init_sensitivity(priv
);
513 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif
);
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
)
521 struct statistics_rx_non_phy
*rx_info
522 = &(priv
->statistics
.rx
.general
);
523 int num_active_rx
= 0;
524 int total_silence
= 0;
526 le32_to_cpu(rx_info
->beacon_silence_rssi_a
) & IN_BAND_FILTER
;
528 le32_to_cpu(rx_info
->beacon_silence_rssi_b
) & IN_BAND_FILTER
;
530 le32_to_cpu(rx_info
->beacon_silence_rssi_c
) & IN_BAND_FILTER
;
533 total_silence
+= bcn_silence_a
;
537 total_silence
+= bcn_silence_b
;
541 total_silence
+= bcn_silence_c
;
545 /* Average among active antennas */
547 priv
->last_rx_noise
= (total_silence
/ num_active_rx
) - 107;
549 priv
->last_rx_noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
551 IWL_DEBUG_CALIB(priv
, "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
);
556 #ifdef CONFIG_IWLWIFI_DEBUG
558 * based on the assumption of all statistics counter are in DWORD
559 * FIXME: This function is for debugging, do not deal with
560 * the case of counters roll-over.
562 static void iwl_accumulative_statistics(struct iwl_priv
*priv
,
569 prev_stats
= (__le32
*)&priv
->statistics
;
570 accum_stats
= (u32
*)&priv
->accum_statistics
;
572 for (i
= sizeof(__le32
); i
< sizeof(struct iwl_notif_statistics
);
573 i
+= sizeof(__le32
), stats
++, prev_stats
++, accum_stats
++)
574 if (le32_to_cpu(*stats
) > le32_to_cpu(*prev_stats
))
575 *accum_stats
+= (le32_to_cpu(*stats
) -
576 le32_to_cpu(*prev_stats
));
578 /* reset accumulative statistics for "no-counter" type statistics */
579 priv
->accum_statistics
.general
.temperature
=
580 priv
->statistics
.general
.temperature
;
581 priv
->accum_statistics
.general
.temperature_m
=
582 priv
->statistics
.general
.temperature_m
;
583 priv
->accum_statistics
.general
.ttl_timestamp
=
584 priv
->statistics
.general
.ttl_timestamp
;
585 priv
->accum_statistics
.tx
.tx_power
.ant_a
=
586 priv
->statistics
.tx
.tx_power
.ant_a
;
587 priv
->accum_statistics
.tx
.tx_power
.ant_b
=
588 priv
->statistics
.tx
.tx_power
.ant_b
;
589 priv
->accum_statistics
.tx
.tx_power
.ant_c
=
590 priv
->statistics
.tx
.tx_power
.ant_c
;
594 #define REG_RECALIB_PERIOD (60)
596 void iwl_rx_statistics(struct iwl_priv
*priv
,
597 struct iwl_rx_mem_buffer
*rxb
)
600 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
602 IWL_DEBUG_RX(priv
, "Statistics notification received (%d vs %d).\n",
603 (int)sizeof(priv
->statistics
),
604 le32_to_cpu(pkt
->len_n_flags
) & FH_RSCSR_FRAME_SIZE_MSK
);
606 change
= ((priv
->statistics
.general
.temperature
!=
607 pkt
->u
.stats
.general
.temperature
) ||
608 ((priv
->statistics
.flag
&
609 STATISTICS_REPLY_FLG_HT40_MODE_MSK
) !=
610 (pkt
->u
.stats
.flag
& STATISTICS_REPLY_FLG_HT40_MODE_MSK
)));
612 #ifdef CONFIG_IWLWIFI_DEBUG
613 iwl_accumulative_statistics(priv
, (__le32
*)&pkt
->u
.stats
);
615 memcpy(&priv
->statistics
, &pkt
->u
.stats
, sizeof(priv
->statistics
));
617 set_bit(STATUS_STATISTICS
, &priv
->status
);
619 /* Reschedule the statistics timer to occur in
620 * REG_RECALIB_PERIOD seconds to ensure we get a
621 * thermal update even if the uCode doesn't give
623 mod_timer(&priv
->statistics_periodic
, jiffies
+
624 msecs_to_jiffies(REG_RECALIB_PERIOD
* 1000));
626 if (unlikely(!test_bit(STATUS_SCANNING
, &priv
->status
)) &&
627 (pkt
->hdr
.cmd
== STATISTICS_NOTIFICATION
)) {
628 iwl_rx_calc_noise(priv
);
629 queue_work(priv
->workqueue
, &priv
->run_time_calib_work
);
631 if (priv
->cfg
->ops
->lib
->temp_ops
.temperature
&& change
)
632 priv
->cfg
->ops
->lib
->temp_ops
.temperature(priv
);
634 EXPORT_SYMBOL(iwl_rx_statistics
);
636 #define PERFECT_RSSI (-20) /* dBm */
637 #define WORST_RSSI (-95) /* dBm */
638 #define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
640 /* Calculate an indication of rx signal quality (a percentage, not dBm!).
641 * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
642 * about formulas used below. */
643 static int iwl_calc_sig_qual(int rssi_dbm
, int noise_dbm
)
646 int degradation
= PERFECT_RSSI
- rssi_dbm
;
648 /* If we get a noise measurement, use signal-to-noise ratio (SNR)
649 * as indicator; formula is (signal dbm - noise dbm).
650 * SNR at or above 40 is a great signal (100%).
651 * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
652 * Weakest usable signal is usually 10 - 15 dB SNR. */
654 if (rssi_dbm
- noise_dbm
>= 40)
656 else if (rssi_dbm
< noise_dbm
)
658 sig_qual
= ((rssi_dbm
- noise_dbm
) * 5) / 2;
660 /* Else use just the signal level.
661 * This formula is a least squares fit of data points collected and
662 * compared with a reference system that had a percentage (%) display
663 * for signal quality. */
665 sig_qual
= (100 * (RSSI_RANGE
* RSSI_RANGE
) - degradation
*
666 (15 * RSSI_RANGE
+ 62 * degradation
)) /
667 (RSSI_RANGE
* RSSI_RANGE
);
671 else if (sig_qual
< 1)
677 /* Calc max signal level (dBm) among 3 possible receivers */
678 static inline int iwl_calc_rssi(struct iwl_priv
*priv
,
679 struct iwl_rx_phy_res
*rx_resp
)
681 return priv
->cfg
->ops
->utils
->calc_rssi(priv
, rx_resp
);
684 #ifdef CONFIG_IWLWIFI_DEBUG
686 * iwl_dbg_report_frame - dump frame to syslog during debug sessions
688 * You may hack this function to show different aspects of received frames,
689 * including selective frame dumps.
690 * group100 parameter selects whether to show 1 out of 100 good data frames.
691 * All beacon and probe response frames are printed.
693 static void iwl_dbg_report_frame(struct iwl_priv
*priv
,
694 struct iwl_rx_phy_res
*phy_res
, u16 length
,
695 struct ieee80211_hdr
*header
, int group100
)
698 u32 print_summary
= 0;
699 u32 print_dump
= 0; /* set to 1 to dump all frames' contents */
710 if (likely(!(iwl_get_debug_level(priv
) & IWL_DL_RX
)))
714 fc
= header
->frame_control
;
715 seq_ctl
= le16_to_cpu(header
->seq_ctrl
);
718 channel
= le16_to_cpu(phy_res
->channel
);
719 phy_flags
= le16_to_cpu(phy_res
->phy_flags
);
720 rate_n_flags
= le32_to_cpu(phy_res
->rate_n_flags
);
722 /* signal statistics */
723 rssi
= iwl_calc_rssi(priv
, phy_res
);
724 tsf_low
= le64_to_cpu(phy_res
->timestamp
) & 0x0ffffffff;
726 to_us
= !compare_ether_addr(header
->addr1
, priv
->mac_addr
);
728 /* if data frame is to us and all is good,
729 * (optionally) print summary for only 1 out of every 100 */
730 if (to_us
&& (fc
& ~cpu_to_le16(IEEE80211_FCTL_PROTECTED
)) ==
731 cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FTYPE_DATA
)) {
734 print_summary
= 1; /* print each frame */
735 else if (priv
->framecnt_to_us
< 100) {
736 priv
->framecnt_to_us
++;
739 priv
->framecnt_to_us
= 0;
744 /* print summary for all other frames */
755 else if (ieee80211_has_retry(fc
))
757 else if (ieee80211_is_assoc_resp(fc
))
759 else if (ieee80211_is_reassoc_resp(fc
))
761 else if (ieee80211_is_probe_resp(fc
)) {
763 print_dump
= 1; /* dump frame contents */
764 } else if (ieee80211_is_beacon(fc
)) {
766 print_dump
= 1; /* dump frame contents */
767 } else if (ieee80211_is_atim(fc
))
769 else if (ieee80211_is_auth(fc
))
771 else if (ieee80211_is_deauth(fc
))
773 else if (ieee80211_is_disassoc(fc
))
778 rate_idx
= iwl_hwrate_to_plcp_idx(rate_n_flags
);
779 if (unlikely((rate_idx
< 0) || (rate_idx
>= IWL_RATE_COUNT
))) {
783 bitrate
= iwl_rates
[rate_idx
].ieee
/ 2;
786 /* print frame summary.
787 * MAC addresses show just the last byte (for brevity),
788 * but you can hack it to show more, if you'd like to. */
790 IWL_DEBUG_RX(priv
, "%s: mhd=0x%04x, dst=0x%02x, "
791 "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
792 title
, le16_to_cpu(fc
), header
->addr1
[5],
793 length
, rssi
, channel
, bitrate
);
795 /* src/dst addresses assume managed mode */
796 IWL_DEBUG_RX(priv
, "%s: 0x%04x, dst=0x%02x, src=0x%02x, "
797 "len=%u, rssi=%d, tim=%lu usec, "
798 "phy=0x%02x, chnl=%d\n",
799 title
, le16_to_cpu(fc
), header
->addr1
[5],
800 header
->addr3
[5], length
, rssi
,
801 tsf_low
- priv
->scan_start_tsf
,
806 iwl_print_hex_dump(priv
, IWL_DL_RX
, header
, length
);
811 * returns non-zero if packet should be dropped
813 int iwl_set_decrypted_flag(struct iwl_priv
*priv
,
814 struct ieee80211_hdr
*hdr
,
816 struct ieee80211_rx_status
*stats
)
818 u16 fc
= le16_to_cpu(hdr
->frame_control
);
820 if (priv
->active_rxon
.filter_flags
& RXON_FILTER_DIS_DECRYPT_MSK
)
823 if (!(fc
& IEEE80211_FCTL_PROTECTED
))
826 IWL_DEBUG_RX(priv
, "decrypt_res:0x%x\n", decrypt_res
);
827 switch (decrypt_res
& RX_RES_STATUS_SEC_TYPE_MSK
) {
828 case RX_RES_STATUS_SEC_TYPE_TKIP
:
829 /* The uCode has got a bad phase 1 Key, pushes the packet.
830 * Decryption will be done in SW. */
831 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
832 RX_RES_STATUS_BAD_KEY_TTAK
)
835 case RX_RES_STATUS_SEC_TYPE_WEP
:
836 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
837 RX_RES_STATUS_BAD_ICV_MIC
) {
838 /* bad ICV, the packet is destroyed since the
839 * decryption is inplace, drop it */
840 IWL_DEBUG_RX(priv
, "Packet destroyed\n");
843 case RX_RES_STATUS_SEC_TYPE_CCMP
:
844 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
845 RX_RES_STATUS_DECRYPT_OK
) {
846 IWL_DEBUG_RX(priv
, "hw decrypt successfully!!!\n");
847 stats
->flag
|= RX_FLAG_DECRYPTED
;
856 EXPORT_SYMBOL(iwl_set_decrypted_flag
);
858 static u32
iwl_translate_rx_status(struct iwl_priv
*priv
, u32 decrypt_in
)
862 if ((decrypt_in
& RX_RES_STATUS_STATION_FOUND
) ==
863 RX_RES_STATUS_STATION_FOUND
)
864 decrypt_out
|= (RX_RES_STATUS_STATION_FOUND
|
865 RX_RES_STATUS_NO_STATION_INFO_MISMATCH
);
867 decrypt_out
|= (decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
);
869 /* packet was not encrypted */
870 if ((decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) ==
871 RX_RES_STATUS_SEC_TYPE_NONE
)
874 /* packet was encrypted with unknown alg */
875 if ((decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) ==
876 RX_RES_STATUS_SEC_TYPE_ERR
)
879 /* decryption was not done in HW */
880 if ((decrypt_in
& RX_MPDU_RES_STATUS_DEC_DONE_MSK
) !=
881 RX_MPDU_RES_STATUS_DEC_DONE_MSK
)
884 switch (decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) {
886 case RX_RES_STATUS_SEC_TYPE_CCMP
:
887 /* alg is CCM: check MIC only */
888 if (!(decrypt_in
& RX_MPDU_RES_STATUS_MIC_OK
))
890 decrypt_out
|= RX_RES_STATUS_BAD_ICV_MIC
;
892 decrypt_out
|= RX_RES_STATUS_DECRYPT_OK
;
896 case RX_RES_STATUS_SEC_TYPE_TKIP
:
897 if (!(decrypt_in
& RX_MPDU_RES_STATUS_TTAK_OK
)) {
899 decrypt_out
|= RX_RES_STATUS_BAD_KEY_TTAK
;
902 /* fall through if TTAK OK */
904 if (!(decrypt_in
& RX_MPDU_RES_STATUS_ICV_OK
))
905 decrypt_out
|= RX_RES_STATUS_BAD_ICV_MIC
;
907 decrypt_out
|= RX_RES_STATUS_DECRYPT_OK
;
911 IWL_DEBUG_RX(priv
, "decrypt_in:0x%x decrypt_out = 0x%x\n",
912 decrypt_in
, decrypt_out
);
917 static void iwl_pass_packet_to_mac80211(struct iwl_priv
*priv
,
918 struct ieee80211_hdr
*hdr
,
921 struct iwl_rx_mem_buffer
*rxb
,
922 struct ieee80211_rx_status
*stats
)
926 __le16 fc
= hdr
->frame_control
;
928 /* We only process data packets if the interface is open */
929 if (unlikely(!priv
->is_open
)) {
930 IWL_DEBUG_DROP_LIMIT(priv
,
931 "Dropping packet while interface is not open.\n");
935 /* In case of HW accelerated crypto and bad decryption, drop */
936 if (!priv
->cfg
->mod_params
->sw_crypto
&&
937 iwl_set_decrypted_flag(priv
, hdr
, ampdu_status
, stats
))
940 skb
= alloc_skb(IWL_LINK_HDR_MAX
, GFP_ATOMIC
);
942 IWL_ERR(priv
, "alloc_skb failed\n");
946 skb_add_rx_frag(skb
, 0, rxb
->page
, (void *)hdr
- rxb_addr(rxb
), len
);
948 /* mac80211 currently doesn't support paged SKB. Convert it to
949 * linear SKB for management frame and data frame requires
950 * software decryption or software defragementation. */
951 if (ieee80211_is_mgmt(fc
) ||
952 ieee80211_has_protected(fc
) ||
953 ieee80211_has_morefrags(fc
) ||
954 le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_FRAG
)
955 ret
= skb_linearize(skb
);
957 ret
= __pskb_pull_tail(skb
, min_t(u16
, IWL_LINK_HDR_MAX
, len
)) ?
966 * XXX: We cannot touch the page and its virtual memory (hdr) after
967 * here. It might have already been freed by the above skb change.
970 iwl_update_stats(priv
, false, fc
, len
);
971 memcpy(IEEE80211_SKB_RXCB(skb
), stats
, sizeof(*stats
));
973 ieee80211_rx(priv
->hw
, skb
);
975 priv
->alloc_rxb_page
--;
979 /* This is necessary only for a number of statistics, see the caller. */
980 static int iwl_is_network_packet(struct iwl_priv
*priv
,
981 struct ieee80211_hdr
*header
)
983 /* Filter incoming packets to determine if they are targeted toward
984 * this network, discarding packets coming from ourselves */
985 switch (priv
->iw_mode
) {
986 case NL80211_IFTYPE_ADHOC
: /* Header: Dest. | Source | BSSID */
987 /* packets to our IBSS update information */
988 return !compare_ether_addr(header
->addr3
, priv
->bssid
);
989 case NL80211_IFTYPE_STATION
: /* Header: Dest. | AP{BSSID} | Source */
990 /* packets to our IBSS update information */
991 return !compare_ether_addr(header
->addr2
, priv
->bssid
);
997 /* Called for REPLY_RX (legacy ABG frames), or
998 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
999 void iwl_rx_reply_rx(struct iwl_priv
*priv
,
1000 struct iwl_rx_mem_buffer
*rxb
)
1002 struct ieee80211_hdr
*header
;
1003 struct ieee80211_rx_status rx_status
;
1004 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
1005 struct iwl_rx_phy_res
*phy_res
;
1006 __le32 rx_pkt_status
;
1007 struct iwl4965_rx_mpdu_res_start
*amsdu
;
1014 * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
1015 * REPLY_RX: physical layer info is in this buffer
1016 * REPLY_RX_MPDU_CMD: physical layer info was sent in separate
1017 * command and cached in priv->last_phy_res
1019 * Here we set up local variables depending on which command is
1022 if (pkt
->hdr
.cmd
== REPLY_RX
) {
1023 phy_res
= (struct iwl_rx_phy_res
*)pkt
->u
.raw
;
1024 header
= (struct ieee80211_hdr
*)(pkt
->u
.raw
+ sizeof(*phy_res
)
1025 + phy_res
->cfg_phy_cnt
);
1027 len
= le16_to_cpu(phy_res
->byte_count
);
1028 rx_pkt_status
= *(__le32
*)(pkt
->u
.raw
+ sizeof(*phy_res
) +
1029 phy_res
->cfg_phy_cnt
+ len
);
1030 ampdu_status
= le32_to_cpu(rx_pkt_status
);
1032 if (!priv
->last_phy_res
[0]) {
1033 IWL_ERR(priv
, "MPDU frame without cached PHY data\n");
1036 phy_res
= (struct iwl_rx_phy_res
*)&priv
->last_phy_res
[1];
1037 amsdu
= (struct iwl4965_rx_mpdu_res_start
*)pkt
->u
.raw
;
1038 header
= (struct ieee80211_hdr
*)(pkt
->u
.raw
+ sizeof(*amsdu
));
1039 len
= le16_to_cpu(amsdu
->byte_count
);
1040 rx_pkt_status
= *(__le32
*)(pkt
->u
.raw
+ sizeof(*amsdu
) + len
);
1041 ampdu_status
= iwl_translate_rx_status(priv
,
1042 le32_to_cpu(rx_pkt_status
));
1045 if ((unlikely(phy_res
->cfg_phy_cnt
> 20))) {
1046 IWL_DEBUG_DROP(priv
, "dsp size out of range [0,20]: %d/n",
1047 phy_res
->cfg_phy_cnt
);
1051 if (!(rx_pkt_status
& RX_RES_STATUS_NO_CRC32_ERROR
) ||
1052 !(rx_pkt_status
& RX_RES_STATUS_NO_RXE_OVERFLOW
)) {
1053 IWL_DEBUG_RX(priv
, "Bad CRC or FIFO: 0x%08X.\n",
1054 le32_to_cpu(rx_pkt_status
));
1058 /* This will be used in several places later */
1059 rate_n_flags
= le32_to_cpu(phy_res
->rate_n_flags
);
1061 /* rx_status carries information about the packet to mac80211 */
1062 rx_status
.mactime
= le64_to_cpu(phy_res
->timestamp
);
1064 ieee80211_channel_to_frequency(le16_to_cpu(phy_res
->channel
));
1065 rx_status
.band
= (phy_res
->phy_flags
& RX_RES_PHY_FLAGS_BAND_24_MSK
) ?
1066 IEEE80211_BAND_2GHZ
: IEEE80211_BAND_5GHZ
;
1067 rx_status
.rate_idx
=
1068 iwl_hwrate_to_mac80211_idx(rate_n_flags
, rx_status
.band
);
1071 /* TSF isn't reliable. In order to allow smooth user experience,
1072 * this W/A doesn't propagate it to the mac80211 */
1073 /*rx_status.flag |= RX_FLAG_TSFT;*/
1075 priv
->ucode_beacon_time
= le32_to_cpu(phy_res
->beacon_time_stamp
);
1077 /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1078 rx_status
.signal
= iwl_calc_rssi(priv
, phy_res
);
1080 /* Meaningful noise values are available only from beacon statistics,
1081 * which are gathered only when associated, and indicate noise
1082 * only for the associated network channel ...
1083 * Ignore these noise values while scanning (other channels) */
1084 if (iwl_is_associated(priv
) &&
1085 !test_bit(STATUS_SCANNING
, &priv
->status
)) {
1086 rx_status
.noise
= priv
->last_rx_noise
;
1087 rx_status
.qual
= iwl_calc_sig_qual(rx_status
.signal
,
1090 rx_status
.noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
1091 rx_status
.qual
= iwl_calc_sig_qual(rx_status
.signal
, 0);
1094 /* Reset beacon noise level if not associated. */
1095 if (!iwl_is_associated(priv
))
1096 priv
->last_rx_noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
1098 #ifdef CONFIG_IWLWIFI_DEBUG
1099 /* Set "1" to report good data frames in groups of 100 */
1100 if (unlikely(iwl_get_debug_level(priv
) & IWL_DL_RX
))
1101 iwl_dbg_report_frame(priv
, phy_res
, len
, header
, 1);
1103 iwl_dbg_log_rx_data_frame(priv
, len
, header
);
1104 IWL_DEBUG_STATS_LIMIT(priv
, "Rssi %d, noise %d, qual %d, TSF %llu\n",
1105 rx_status
.signal
, rx_status
.noise
, rx_status
.qual
,
1106 (unsigned long long)rx_status
.mactime
);
1111 * It seems that the antenna field in the phy flags value
1112 * is actually a bit field. This is undefined by radiotap,
1113 * it wants an actual antenna number but I always get "7"
1114 * for most legacy frames I receive indicating that the
1115 * same frame was received on all three RX chains.
1117 * I think this field should be removed in favor of a
1118 * new 802.11n radiotap field "RX chains" that is defined
1122 (le16_to_cpu(phy_res
->phy_flags
) & RX_RES_PHY_FLAGS_ANTENNA_MSK
)
1123 >> RX_RES_PHY_FLAGS_ANTENNA_POS
;
1125 /* set the preamble flag if appropriate */
1126 if (phy_res
->phy_flags
& RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK
)
1127 rx_status
.flag
|= RX_FLAG_SHORTPRE
;
1129 /* Set up the HT phy flags */
1130 if (rate_n_flags
& RATE_MCS_HT_MSK
)
1131 rx_status
.flag
|= RX_FLAG_HT
;
1132 if (rate_n_flags
& RATE_MCS_HT40_MSK
)
1133 rx_status
.flag
|= RX_FLAG_40MHZ
;
1134 if (rate_n_flags
& RATE_MCS_SGI_MSK
)
1135 rx_status
.flag
|= RX_FLAG_SHORT_GI
;
1137 if (iwl_is_network_packet(priv
, header
)) {
1138 priv
->last_rx_rssi
= rx_status
.signal
;
1139 priv
->last_beacon_time
= priv
->ucode_beacon_time
;
1140 priv
->last_tsf
= le64_to_cpu(phy_res
->timestamp
);
1143 fc
= le16_to_cpu(header
->frame_control
);
1144 switch (fc
& IEEE80211_FCTL_FTYPE
) {
1145 case IEEE80211_FTYPE_MGMT
:
1146 case IEEE80211_FTYPE_DATA
:
1147 if (priv
->iw_mode
== NL80211_IFTYPE_AP
)
1148 iwl_update_ps_mode(priv
, fc
& IEEE80211_FCTL_PM
,
1152 iwl_pass_packet_to_mac80211(priv
, header
, len
, ampdu_status
,
1158 EXPORT_SYMBOL(iwl_rx_reply_rx
);
1160 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1161 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1162 void iwl_rx_reply_rx_phy(struct iwl_priv
*priv
,
1163 struct iwl_rx_mem_buffer
*rxb
)
1165 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
1166 priv
->last_phy_res
[0] = 1;
1167 memcpy(&priv
->last_phy_res
[1], &(pkt
->u
.raw
[0]),
1168 sizeof(struct iwl_rx_phy_res
));
1170 EXPORT_SYMBOL(iwl_rx_reply_rx_phy
);