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_DEBUG_INFO(priv
, "Rx queue requesting wakeup, GP1 = 0x%x\n",
145 iwl_set_bit(priv
, CSR_GP_CNTRL
,
146 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ
);
150 q
->write_actual
= (q
->write
& ~0x7);
151 iwl_write_direct32(priv
, rx_wrt_ptr_reg
, q
->write_actual
);
153 /* Else device is assumed to be awake */
155 /* Device expects a multiple of 8 */
156 q
->write_actual
= (q
->write
& ~0x7);
157 iwl_write_direct32(priv
, rx_wrt_ptr_reg
, q
->write_actual
);
163 spin_unlock_irqrestore(&q
->lock
, flags
);
166 EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr
);
168 * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
170 static inline __le32
iwl_dma_addr2rbd_ptr(struct iwl_priv
*priv
,
173 return cpu_to_le32((u32
)(dma_addr
>> 8));
177 * iwl_rx_queue_restock - refill RX queue from pre-allocated pool
179 * If there are slots in the RX queue that need to be restocked,
180 * and we have free pre-allocated buffers, fill the ranks as much
181 * as we can, pulling from rx_free.
183 * This moves the 'write' index forward to catch up with 'processed', and
184 * also updates the memory address in the firmware to reference the new
187 int iwl_rx_queue_restock(struct iwl_priv
*priv
)
189 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
190 struct list_head
*element
;
191 struct iwl_rx_mem_buffer
*rxb
;
196 spin_lock_irqsave(&rxq
->lock
, flags
);
197 write
= rxq
->write
& ~0x7;
198 while ((iwl_rx_queue_space(rxq
) > 0) && (rxq
->free_count
)) {
199 /* Get next free Rx buffer, remove from free list */
200 element
= rxq
->rx_free
.next
;
201 rxb
= list_entry(element
, struct iwl_rx_mem_buffer
, list
);
204 /* Point to Rx buffer via next RBD in circular buffer */
205 rxq
->bd
[rxq
->write
] = iwl_dma_addr2rbd_ptr(priv
, rxb
->page_dma
);
206 rxq
->queue
[rxq
->write
] = rxb
;
207 rxq
->write
= (rxq
->write
+ 1) & RX_QUEUE_MASK
;
210 spin_unlock_irqrestore(&rxq
->lock
, flags
);
211 /* If the pre-allocated buffer pool is dropping low, schedule to
213 if (rxq
->free_count
<= RX_LOW_WATERMARK
)
214 queue_work(priv
->workqueue
, &priv
->rx_replenish
);
217 /* If we've added more space for the firmware to place data, tell it.
218 * Increment device's write pointer in multiples of 8. */
219 if (rxq
->write_actual
!= (rxq
->write
& ~0x7)) {
220 spin_lock_irqsave(&rxq
->lock
, flags
);
221 rxq
->need_update
= 1;
222 spin_unlock_irqrestore(&rxq
->lock
, flags
);
223 ret
= iwl_rx_queue_update_write_ptr(priv
, rxq
);
228 EXPORT_SYMBOL(iwl_rx_queue_restock
);
232 * iwl_rx_replenish - Move all used packet from rx_used to rx_free
234 * When moving to rx_free an SKB is allocated for the slot.
236 * Also restock the Rx queue via iwl_rx_queue_restock.
237 * This is called as a scheduled work item (except for during initialization)
239 void iwl_rx_allocate(struct iwl_priv
*priv
, gfp_t priority
)
241 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
242 struct list_head
*element
;
243 struct iwl_rx_mem_buffer
*rxb
;
246 gfp_t gfp_mask
= priority
;
249 spin_lock_irqsave(&rxq
->lock
, flags
);
250 if (list_empty(&rxq
->rx_used
)) {
251 spin_unlock_irqrestore(&rxq
->lock
, flags
);
254 spin_unlock_irqrestore(&rxq
->lock
, flags
);
256 if (rxq
->free_count
> RX_LOW_WATERMARK
)
257 gfp_mask
|= __GFP_NOWARN
;
259 if (priv
->hw_params
.rx_page_order
> 0)
260 gfp_mask
|= __GFP_COMP
;
262 /* Alloc a new receive buffer */
263 page
= alloc_pages(gfp_mask
, priv
->hw_params
.rx_page_order
);
266 IWL_DEBUG_INFO(priv
, "alloc_pages failed, "
268 priv
->hw_params
.rx_page_order
);
270 if ((rxq
->free_count
<= RX_LOW_WATERMARK
) &&
272 IWL_CRIT(priv
, "Failed to alloc_pages with %s. Only %u free buffers remaining.\n",
273 priority
== GFP_ATOMIC
? "GFP_ATOMIC" : "GFP_KERNEL",
275 /* We don't reschedule replenish work here -- we will
276 * call the restock method and if it still needs
277 * more buffers it will schedule replenish */
281 spin_lock_irqsave(&rxq
->lock
, flags
);
283 if (list_empty(&rxq
->rx_used
)) {
284 spin_unlock_irqrestore(&rxq
->lock
, flags
);
285 __free_pages(page
, priv
->hw_params
.rx_page_order
);
288 element
= rxq
->rx_used
.next
;
289 rxb
= list_entry(element
, struct iwl_rx_mem_buffer
, list
);
292 spin_unlock_irqrestore(&rxq
->lock
, flags
);
295 /* Get physical address of the RB */
296 rxb
->page_dma
= pci_map_page(priv
->pci_dev
, page
, 0,
297 PAGE_SIZE
<< priv
->hw_params
.rx_page_order
,
299 /* dma address must be no more than 36 bits */
300 BUG_ON(rxb
->page_dma
& ~DMA_BIT_MASK(36));
301 /* and also 256 byte aligned! */
302 BUG_ON(rxb
->page_dma
& DMA_BIT_MASK(8));
304 spin_lock_irqsave(&rxq
->lock
, flags
);
306 list_add_tail(&rxb
->list
, &rxq
->rx_free
);
308 priv
->alloc_rxb_page
++;
310 spin_unlock_irqrestore(&rxq
->lock
, flags
);
314 void iwl_rx_replenish(struct iwl_priv
*priv
)
318 iwl_rx_allocate(priv
, GFP_KERNEL
);
320 spin_lock_irqsave(&priv
->lock
, flags
);
321 iwl_rx_queue_restock(priv
);
322 spin_unlock_irqrestore(&priv
->lock
, flags
);
324 EXPORT_SYMBOL(iwl_rx_replenish
);
326 void iwl_rx_replenish_now(struct iwl_priv
*priv
)
328 iwl_rx_allocate(priv
, GFP_ATOMIC
);
330 iwl_rx_queue_restock(priv
);
332 EXPORT_SYMBOL(iwl_rx_replenish_now
);
335 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
336 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
337 * This free routine walks the list of POOL entries and if SKB is set to
338 * non NULL it is unmapped and freed
340 void iwl_rx_queue_free(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
343 for (i
= 0; i
< RX_QUEUE_SIZE
+ RX_FREE_BUFFERS
; i
++) {
344 if (rxq
->pool
[i
].page
!= NULL
) {
345 pci_unmap_page(priv
->pci_dev
, rxq
->pool
[i
].page_dma
,
346 PAGE_SIZE
<< priv
->hw_params
.rx_page_order
,
348 __free_pages(rxq
->pool
[i
].page
,
349 priv
->hw_params
.rx_page_order
);
350 rxq
->pool
[i
].page
= NULL
;
351 priv
->alloc_rxb_page
--;
355 pci_free_consistent(priv
->pci_dev
, 4 * RX_QUEUE_SIZE
, rxq
->bd
,
357 pci_free_consistent(priv
->pci_dev
, sizeof(struct iwl_rb_status
),
358 rxq
->rb_stts
, rxq
->rb_stts_dma
);
362 EXPORT_SYMBOL(iwl_rx_queue_free
);
364 int iwl_rx_queue_alloc(struct iwl_priv
*priv
)
366 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
367 struct pci_dev
*dev
= priv
->pci_dev
;
370 spin_lock_init(&rxq
->lock
);
371 INIT_LIST_HEAD(&rxq
->rx_free
);
372 INIT_LIST_HEAD(&rxq
->rx_used
);
374 /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
375 rxq
->bd
= pci_alloc_consistent(dev
, 4 * RX_QUEUE_SIZE
, &rxq
->dma_addr
);
379 rxq
->rb_stts
= pci_alloc_consistent(dev
, sizeof(struct iwl_rb_status
),
384 /* Fill the rx_used queue with _all_ of the Rx buffers */
385 for (i
= 0; i
< RX_FREE_BUFFERS
+ RX_QUEUE_SIZE
; i
++)
386 list_add_tail(&rxq
->pool
[i
].list
, &rxq
->rx_used
);
388 /* Set us so that we have processed and used all buffers, but have
389 * not restocked the Rx queue with fresh buffers */
390 rxq
->read
= rxq
->write
= 0;
391 rxq
->write_actual
= 0;
393 rxq
->need_update
= 0;
397 pci_free_consistent(priv
->pci_dev
, 4 * RX_QUEUE_SIZE
, rxq
->bd
,
402 EXPORT_SYMBOL(iwl_rx_queue_alloc
);
404 void iwl_rx_queue_reset(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
408 spin_lock_irqsave(&rxq
->lock
, flags
);
409 INIT_LIST_HEAD(&rxq
->rx_free
);
410 INIT_LIST_HEAD(&rxq
->rx_used
);
411 /* Fill the rx_used queue with _all_ of the Rx buffers */
412 for (i
= 0; i
< RX_FREE_BUFFERS
+ RX_QUEUE_SIZE
; i
++) {
413 /* In the reset function, these buffers may have been allocated
414 * to an SKB, so we need to unmap and free potential storage */
415 if (rxq
->pool
[i
].page
!= NULL
) {
416 pci_unmap_page(priv
->pci_dev
, rxq
->pool
[i
].page_dma
,
417 PAGE_SIZE
<< priv
->hw_params
.rx_page_order
,
419 priv
->alloc_rxb_page
--;
420 __free_pages(rxq
->pool
[i
].page
,
421 priv
->hw_params
.rx_page_order
);
422 rxq
->pool
[i
].page
= NULL
;
424 list_add_tail(&rxq
->pool
[i
].list
, &rxq
->rx_used
);
427 /* Set us so that we have processed and used all buffers, but have
428 * not restocked the Rx queue with fresh buffers */
429 rxq
->read
= rxq
->write
= 0;
430 rxq
->write_actual
= 0;
432 spin_unlock_irqrestore(&rxq
->lock
, flags
);
435 int iwl_rx_init(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
438 const u32 rfdnlog
= RX_QUEUE_SIZE_LOG
; /* 256 RBDs */
439 u32 rb_timeout
= 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
441 if (!priv
->cfg
->use_isr_legacy
)
442 rb_timeout
= RX_RB_TIMEOUT
;
444 if (priv
->cfg
->mod_params
->amsdu_size_8K
)
445 rb_size
= FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K
;
447 rb_size
= FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K
;
450 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
, 0);
452 /* Reset driver's Rx queue write index */
453 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_RBDCB_WPTR_REG
, 0);
455 /* Tell device where to find RBD circular buffer in DRAM */
456 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_RBDCB_BASE_REG
,
457 (u32
)(rxq
->dma_addr
>> 8));
459 /* Tell device where in DRAM to update its Rx status */
460 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_STTS_WPTR_REG
,
461 rxq
->rb_stts_dma
>> 4);
464 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
465 * the credit mechanism in 5000 HW RX FIFO
466 * Direct rx interrupts to hosts
467 * Rx buffer size 4 or 8k
471 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
,
472 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL
|
473 FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY
|
474 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL
|
475 FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK
|
477 (rb_timeout
<< FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS
)|
478 (rfdnlog
<< FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS
));
480 /* Set interrupt coalescing timer to 64 x 32 = 2048 usecs */
481 iwl_write8(priv
, CSR_INT_COALESCING
, 0x40);
486 int iwl_rxq_stop(struct iwl_priv
*priv
)
490 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
, 0);
491 iwl_poll_direct_bit(priv
, FH_MEM_RSSR_RX_STATUS_REG
,
492 FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE
, 1000);
496 EXPORT_SYMBOL(iwl_rxq_stop
);
498 void iwl_rx_missed_beacon_notif(struct iwl_priv
*priv
,
499 struct iwl_rx_mem_buffer
*rxb
)
502 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
503 struct iwl_missed_beacon_notif
*missed_beacon
;
505 missed_beacon
= &pkt
->u
.missed_beacon
;
506 if (le32_to_cpu(missed_beacon
->consequtive_missed_beacons
) > 5) {
507 IWL_DEBUG_CALIB(priv
, "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
508 le32_to_cpu(missed_beacon
->consequtive_missed_beacons
),
509 le32_to_cpu(missed_beacon
->total_missed_becons
),
510 le32_to_cpu(missed_beacon
->num_recvd_beacons
),
511 le32_to_cpu(missed_beacon
->num_expected_beacons
));
512 if (!test_bit(STATUS_SCANNING
, &priv
->status
))
513 iwl_init_sensitivity(priv
);
516 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif
);
519 /* Calculate noise level, based on measurements during network silence just
520 * before arriving beacon. This measurement can be done only if we know
521 * exactly when to expect beacons, therefore only when we're associated. */
522 static void iwl_rx_calc_noise(struct iwl_priv
*priv
)
524 struct statistics_rx_non_phy
*rx_info
525 = &(priv
->statistics
.rx
.general
);
526 int num_active_rx
= 0;
527 int total_silence
= 0;
529 le32_to_cpu(rx_info
->beacon_silence_rssi_a
) & IN_BAND_FILTER
;
531 le32_to_cpu(rx_info
->beacon_silence_rssi_b
) & IN_BAND_FILTER
;
533 le32_to_cpu(rx_info
->beacon_silence_rssi_c
) & IN_BAND_FILTER
;
536 total_silence
+= bcn_silence_a
;
540 total_silence
+= bcn_silence_b
;
544 total_silence
+= bcn_silence_c
;
548 /* Average among active antennas */
550 priv
->last_rx_noise
= (total_silence
/ num_active_rx
) - 107;
552 priv
->last_rx_noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
554 IWL_DEBUG_CALIB(priv
, "inband silence a %u, b %u, c %u, dBm %d\n",
555 bcn_silence_a
, bcn_silence_b
, bcn_silence_c
,
556 priv
->last_rx_noise
);
559 #ifdef CONFIG_IWLWIFI_DEBUG
561 * based on the assumption of all statistics counter are in DWORD
562 * FIXME: This function is for debugging, do not deal with
563 * the case of counters roll-over.
565 static void iwl_accumulative_statistics(struct iwl_priv
*priv
,
572 prev_stats
= (__le32
*)&priv
->statistics
;
573 accum_stats
= (u32
*)&priv
->accum_statistics
;
575 for (i
= sizeof(__le32
); i
< sizeof(struct iwl_notif_statistics
);
576 i
+= sizeof(__le32
), stats
++, prev_stats
++, accum_stats
++)
577 if (le32_to_cpu(*stats
) > le32_to_cpu(*prev_stats
))
578 *accum_stats
+= (le32_to_cpu(*stats
) -
579 le32_to_cpu(*prev_stats
));
581 /* reset accumulative statistics for "no-counter" type statistics */
582 priv
->accum_statistics
.general
.temperature
=
583 priv
->statistics
.general
.temperature
;
584 priv
->accum_statistics
.general
.temperature_m
=
585 priv
->statistics
.general
.temperature_m
;
586 priv
->accum_statistics
.general
.ttl_timestamp
=
587 priv
->statistics
.general
.ttl_timestamp
;
588 priv
->accum_statistics
.tx
.tx_power
.ant_a
=
589 priv
->statistics
.tx
.tx_power
.ant_a
;
590 priv
->accum_statistics
.tx
.tx_power
.ant_b
=
591 priv
->statistics
.tx
.tx_power
.ant_b
;
592 priv
->accum_statistics
.tx
.tx_power
.ant_c
=
593 priv
->statistics
.tx
.tx_power
.ant_c
;
597 #define REG_RECALIB_PERIOD (60)
599 void iwl_rx_statistics(struct iwl_priv
*priv
,
600 struct iwl_rx_mem_buffer
*rxb
)
603 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
605 IWL_DEBUG_RX(priv
, "Statistics notification received (%d vs %d).\n",
606 (int)sizeof(priv
->statistics
),
607 le32_to_cpu(pkt
->len_n_flags
) & FH_RSCSR_FRAME_SIZE_MSK
);
609 change
= ((priv
->statistics
.general
.temperature
!=
610 pkt
->u
.stats
.general
.temperature
) ||
611 ((priv
->statistics
.flag
&
612 STATISTICS_REPLY_FLG_HT40_MODE_MSK
) !=
613 (pkt
->u
.stats
.flag
& STATISTICS_REPLY_FLG_HT40_MODE_MSK
)));
615 #ifdef CONFIG_IWLWIFI_DEBUG
616 iwl_accumulative_statistics(priv
, (__le32
*)&pkt
->u
.stats
);
618 memcpy(&priv
->statistics
, &pkt
->u
.stats
, sizeof(priv
->statistics
));
620 set_bit(STATUS_STATISTICS
, &priv
->status
);
622 /* Reschedule the statistics timer to occur in
623 * REG_RECALIB_PERIOD seconds to ensure we get a
624 * thermal update even if the uCode doesn't give
626 mod_timer(&priv
->statistics_periodic
, jiffies
+
627 msecs_to_jiffies(REG_RECALIB_PERIOD
* 1000));
629 if (unlikely(!test_bit(STATUS_SCANNING
, &priv
->status
)) &&
630 (pkt
->hdr
.cmd
== STATISTICS_NOTIFICATION
)) {
631 iwl_rx_calc_noise(priv
);
632 queue_work(priv
->workqueue
, &priv
->run_time_calib_work
);
634 if (priv
->cfg
->ops
->lib
->temp_ops
.temperature
&& change
)
635 priv
->cfg
->ops
->lib
->temp_ops
.temperature(priv
);
637 EXPORT_SYMBOL(iwl_rx_statistics
);
639 void iwl_reply_statistics(struct iwl_priv
*priv
,
640 struct iwl_rx_mem_buffer
*rxb
)
642 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
644 if (le32_to_cpu(pkt
->u
.stats
.flag
) & UCODE_STATISTICS_CLEAR_MSK
) {
645 memset(&priv
->statistics
, 0,
646 sizeof(struct iwl_notif_statistics
));
647 #ifdef CONFIG_IWLWIFI_DEBUG
648 memset(&priv
->accum_statistics
, 0,
649 sizeof(struct iwl_notif_statistics
));
651 IWL_DEBUG_RX(priv
, "Statistics have been cleared\n");
653 iwl_rx_statistics(priv
, rxb
);
655 EXPORT_SYMBOL(iwl_reply_statistics
);
657 #define PERFECT_RSSI (-20) /* dBm */
658 #define WORST_RSSI (-95) /* dBm */
659 #define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
661 /* Calculate an indication of rx signal quality (a percentage, not dBm!).
662 * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
663 * about formulas used below. */
664 static int iwl_calc_sig_qual(int rssi_dbm
, int noise_dbm
)
667 int degradation
= PERFECT_RSSI
- rssi_dbm
;
669 /* If we get a noise measurement, use signal-to-noise ratio (SNR)
670 * as indicator; formula is (signal dbm - noise dbm).
671 * SNR at or above 40 is a great signal (100%).
672 * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
673 * Weakest usable signal is usually 10 - 15 dB SNR. */
675 if (rssi_dbm
- noise_dbm
>= 40)
677 else if (rssi_dbm
< noise_dbm
)
679 sig_qual
= ((rssi_dbm
- noise_dbm
) * 5) / 2;
681 /* Else use just the signal level.
682 * This formula is a least squares fit of data points collected and
683 * compared with a reference system that had a percentage (%) display
684 * for signal quality. */
686 sig_qual
= (100 * (RSSI_RANGE
* RSSI_RANGE
) - degradation
*
687 (15 * RSSI_RANGE
+ 62 * degradation
)) /
688 (RSSI_RANGE
* RSSI_RANGE
);
692 else if (sig_qual
< 1)
698 /* Calc max signal level (dBm) among 3 possible receivers */
699 static inline int iwl_calc_rssi(struct iwl_priv
*priv
,
700 struct iwl_rx_phy_res
*rx_resp
)
702 return priv
->cfg
->ops
->utils
->calc_rssi(priv
, rx_resp
);
705 #ifdef CONFIG_IWLWIFI_DEBUG
707 * iwl_dbg_report_frame - dump frame to syslog during debug sessions
709 * You may hack this function to show different aspects of received frames,
710 * including selective frame dumps.
711 * group100 parameter selects whether to show 1 out of 100 good data frames.
712 * All beacon and probe response frames are printed.
714 static void iwl_dbg_report_frame(struct iwl_priv
*priv
,
715 struct iwl_rx_phy_res
*phy_res
, u16 length
,
716 struct ieee80211_hdr
*header
, int group100
)
719 u32 print_summary
= 0;
720 u32 print_dump
= 0; /* set to 1 to dump all frames' contents */
731 if (likely(!(iwl_get_debug_level(priv
) & IWL_DL_RX
)))
735 fc
= header
->frame_control
;
736 seq_ctl
= le16_to_cpu(header
->seq_ctrl
);
739 channel
= le16_to_cpu(phy_res
->channel
);
740 phy_flags
= le16_to_cpu(phy_res
->phy_flags
);
741 rate_n_flags
= le32_to_cpu(phy_res
->rate_n_flags
);
743 /* signal statistics */
744 rssi
= iwl_calc_rssi(priv
, phy_res
);
745 tsf_low
= le64_to_cpu(phy_res
->timestamp
) & 0x0ffffffff;
747 to_us
= !compare_ether_addr(header
->addr1
, priv
->mac_addr
);
749 /* if data frame is to us and all is good,
750 * (optionally) print summary for only 1 out of every 100 */
751 if (to_us
&& (fc
& ~cpu_to_le16(IEEE80211_FCTL_PROTECTED
)) ==
752 cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FTYPE_DATA
)) {
755 print_summary
= 1; /* print each frame */
756 else if (priv
->framecnt_to_us
< 100) {
757 priv
->framecnt_to_us
++;
760 priv
->framecnt_to_us
= 0;
765 /* print summary for all other frames */
776 else if (ieee80211_has_retry(fc
))
778 else if (ieee80211_is_assoc_resp(fc
))
780 else if (ieee80211_is_reassoc_resp(fc
))
782 else if (ieee80211_is_probe_resp(fc
)) {
784 print_dump
= 1; /* dump frame contents */
785 } else if (ieee80211_is_beacon(fc
)) {
787 print_dump
= 1; /* dump frame contents */
788 } else if (ieee80211_is_atim(fc
))
790 else if (ieee80211_is_auth(fc
))
792 else if (ieee80211_is_deauth(fc
))
794 else if (ieee80211_is_disassoc(fc
))
799 rate_idx
= iwl_hwrate_to_plcp_idx(rate_n_flags
);
800 if (unlikely((rate_idx
< 0) || (rate_idx
>= IWL_RATE_COUNT
))) {
804 bitrate
= iwl_rates
[rate_idx
].ieee
/ 2;
807 /* print frame summary.
808 * MAC addresses show just the last byte (for brevity),
809 * but you can hack it to show more, if you'd like to. */
811 IWL_DEBUG_RX(priv
, "%s: mhd=0x%04x, dst=0x%02x, "
812 "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
813 title
, le16_to_cpu(fc
), header
->addr1
[5],
814 length
, rssi
, channel
, bitrate
);
816 /* src/dst addresses assume managed mode */
817 IWL_DEBUG_RX(priv
, "%s: 0x%04x, dst=0x%02x, src=0x%02x, "
818 "len=%u, rssi=%d, tim=%lu usec, "
819 "phy=0x%02x, chnl=%d\n",
820 title
, le16_to_cpu(fc
), header
->addr1
[5],
821 header
->addr3
[5], length
, rssi
,
822 tsf_low
- priv
->scan_start_tsf
,
827 iwl_print_hex_dump(priv
, IWL_DL_RX
, header
, length
);
832 * returns non-zero if packet should be dropped
834 int iwl_set_decrypted_flag(struct iwl_priv
*priv
,
835 struct ieee80211_hdr
*hdr
,
837 struct ieee80211_rx_status
*stats
)
839 u16 fc
= le16_to_cpu(hdr
->frame_control
);
841 if (priv
->active_rxon
.filter_flags
& RXON_FILTER_DIS_DECRYPT_MSK
)
844 if (!(fc
& IEEE80211_FCTL_PROTECTED
))
847 IWL_DEBUG_RX(priv
, "decrypt_res:0x%x\n", decrypt_res
);
848 switch (decrypt_res
& RX_RES_STATUS_SEC_TYPE_MSK
) {
849 case RX_RES_STATUS_SEC_TYPE_TKIP
:
850 /* The uCode has got a bad phase 1 Key, pushes the packet.
851 * Decryption will be done in SW. */
852 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
853 RX_RES_STATUS_BAD_KEY_TTAK
)
856 case RX_RES_STATUS_SEC_TYPE_WEP
:
857 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
858 RX_RES_STATUS_BAD_ICV_MIC
) {
859 /* bad ICV, the packet is destroyed since the
860 * decryption is inplace, drop it */
861 IWL_DEBUG_RX(priv
, "Packet destroyed\n");
864 case RX_RES_STATUS_SEC_TYPE_CCMP
:
865 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
866 RX_RES_STATUS_DECRYPT_OK
) {
867 IWL_DEBUG_RX(priv
, "hw decrypt successfully!!!\n");
868 stats
->flag
|= RX_FLAG_DECRYPTED
;
877 EXPORT_SYMBOL(iwl_set_decrypted_flag
);
879 static u32
iwl_translate_rx_status(struct iwl_priv
*priv
, u32 decrypt_in
)
883 if ((decrypt_in
& RX_RES_STATUS_STATION_FOUND
) ==
884 RX_RES_STATUS_STATION_FOUND
)
885 decrypt_out
|= (RX_RES_STATUS_STATION_FOUND
|
886 RX_RES_STATUS_NO_STATION_INFO_MISMATCH
);
888 decrypt_out
|= (decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
);
890 /* packet was not encrypted */
891 if ((decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) ==
892 RX_RES_STATUS_SEC_TYPE_NONE
)
895 /* packet was encrypted with unknown alg */
896 if ((decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) ==
897 RX_RES_STATUS_SEC_TYPE_ERR
)
900 /* decryption was not done in HW */
901 if ((decrypt_in
& RX_MPDU_RES_STATUS_DEC_DONE_MSK
) !=
902 RX_MPDU_RES_STATUS_DEC_DONE_MSK
)
905 switch (decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) {
907 case RX_RES_STATUS_SEC_TYPE_CCMP
:
908 /* alg is CCM: check MIC only */
909 if (!(decrypt_in
& RX_MPDU_RES_STATUS_MIC_OK
))
911 decrypt_out
|= RX_RES_STATUS_BAD_ICV_MIC
;
913 decrypt_out
|= RX_RES_STATUS_DECRYPT_OK
;
917 case RX_RES_STATUS_SEC_TYPE_TKIP
:
918 if (!(decrypt_in
& RX_MPDU_RES_STATUS_TTAK_OK
)) {
920 decrypt_out
|= RX_RES_STATUS_BAD_KEY_TTAK
;
923 /* fall through if TTAK OK */
925 if (!(decrypt_in
& RX_MPDU_RES_STATUS_ICV_OK
))
926 decrypt_out
|= RX_RES_STATUS_BAD_ICV_MIC
;
928 decrypt_out
|= RX_RES_STATUS_DECRYPT_OK
;
932 IWL_DEBUG_RX(priv
, "decrypt_in:0x%x decrypt_out = 0x%x\n",
933 decrypt_in
, decrypt_out
);
938 static void iwl_pass_packet_to_mac80211(struct iwl_priv
*priv
,
939 struct ieee80211_hdr
*hdr
,
942 struct iwl_rx_mem_buffer
*rxb
,
943 struct ieee80211_rx_status
*stats
)
947 __le16 fc
= hdr
->frame_control
;
949 /* We only process data packets if the interface is open */
950 if (unlikely(!priv
->is_open
)) {
951 IWL_DEBUG_DROP_LIMIT(priv
,
952 "Dropping packet while interface is not open.\n");
956 /* In case of HW accelerated crypto and bad decryption, drop */
957 if (!priv
->cfg
->mod_params
->sw_crypto
&&
958 iwl_set_decrypted_flag(priv
, hdr
, ampdu_status
, stats
))
961 skb
= alloc_skb(IWL_LINK_HDR_MAX
* 2, GFP_ATOMIC
);
963 IWL_ERR(priv
, "alloc_skb failed\n");
967 skb_reserve(skb
, IWL_LINK_HDR_MAX
);
968 skb_add_rx_frag(skb
, 0, rxb
->page
, (void *)hdr
- rxb_addr(rxb
), len
);
970 /* mac80211 currently doesn't support paged SKB. Convert it to
971 * linear SKB for management frame and data frame requires
972 * software decryption or software defragementation. */
973 if (ieee80211_is_mgmt(fc
) ||
974 ieee80211_has_protected(fc
) ||
975 ieee80211_has_morefrags(fc
) ||
976 le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_FRAG
)
977 ret
= skb_linearize(skb
);
979 ret
= __pskb_pull_tail(skb
, min_t(u16
, IWL_LINK_HDR_MAX
, len
)) ?
988 * XXX: We cannot touch the page and its virtual memory (hdr) after
989 * here. It might have already been freed by the above skb change.
992 iwl_update_stats(priv
, false, fc
, len
);
993 memcpy(IEEE80211_SKB_RXCB(skb
), stats
, sizeof(*stats
));
995 ieee80211_rx(priv
->hw
, skb
);
997 priv
->alloc_rxb_page
--;
1001 /* This is necessary only for a number of statistics, see the caller. */
1002 static int iwl_is_network_packet(struct iwl_priv
*priv
,
1003 struct ieee80211_hdr
*header
)
1005 /* Filter incoming packets to determine if they are targeted toward
1006 * this network, discarding packets coming from ourselves */
1007 switch (priv
->iw_mode
) {
1008 case NL80211_IFTYPE_ADHOC
: /* Header: Dest. | Source | BSSID */
1009 /* packets to our IBSS update information */
1010 return !compare_ether_addr(header
->addr3
, priv
->bssid
);
1011 case NL80211_IFTYPE_STATION
: /* Header: Dest. | AP{BSSID} | Source */
1012 /* packets to our IBSS update information */
1013 return !compare_ether_addr(header
->addr2
, priv
->bssid
);
1019 /* Called for REPLY_RX (legacy ABG frames), or
1020 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
1021 void iwl_rx_reply_rx(struct iwl_priv
*priv
,
1022 struct iwl_rx_mem_buffer
*rxb
)
1024 struct ieee80211_hdr
*header
;
1025 struct ieee80211_rx_status rx_status
;
1026 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
1027 struct iwl_rx_phy_res
*phy_res
;
1028 __le32 rx_pkt_status
;
1029 struct iwl4965_rx_mpdu_res_start
*amsdu
;
1035 * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
1036 * REPLY_RX: physical layer info is in this buffer
1037 * REPLY_RX_MPDU_CMD: physical layer info was sent in separate
1038 * command and cached in priv->last_phy_res
1040 * Here we set up local variables depending on which command is
1043 if (pkt
->hdr
.cmd
== REPLY_RX
) {
1044 phy_res
= (struct iwl_rx_phy_res
*)pkt
->u
.raw
;
1045 header
= (struct ieee80211_hdr
*)(pkt
->u
.raw
+ sizeof(*phy_res
)
1046 + phy_res
->cfg_phy_cnt
);
1048 len
= le16_to_cpu(phy_res
->byte_count
);
1049 rx_pkt_status
= *(__le32
*)(pkt
->u
.raw
+ sizeof(*phy_res
) +
1050 phy_res
->cfg_phy_cnt
+ len
);
1051 ampdu_status
= le32_to_cpu(rx_pkt_status
);
1053 if (!priv
->last_phy_res
[0]) {
1054 IWL_ERR(priv
, "MPDU frame without cached PHY data\n");
1057 phy_res
= (struct iwl_rx_phy_res
*)&priv
->last_phy_res
[1];
1058 amsdu
= (struct iwl4965_rx_mpdu_res_start
*)pkt
->u
.raw
;
1059 header
= (struct ieee80211_hdr
*)(pkt
->u
.raw
+ sizeof(*amsdu
));
1060 len
= le16_to_cpu(amsdu
->byte_count
);
1061 rx_pkt_status
= *(__le32
*)(pkt
->u
.raw
+ sizeof(*amsdu
) + len
);
1062 ampdu_status
= iwl_translate_rx_status(priv
,
1063 le32_to_cpu(rx_pkt_status
));
1066 if ((unlikely(phy_res
->cfg_phy_cnt
> 20))) {
1067 IWL_DEBUG_DROP(priv
, "dsp size out of range [0,20]: %d/n",
1068 phy_res
->cfg_phy_cnt
);
1072 if (!(rx_pkt_status
& RX_RES_STATUS_NO_CRC32_ERROR
) ||
1073 !(rx_pkt_status
& RX_RES_STATUS_NO_RXE_OVERFLOW
)) {
1074 IWL_DEBUG_RX(priv
, "Bad CRC or FIFO: 0x%08X.\n",
1075 le32_to_cpu(rx_pkt_status
));
1079 /* This will be used in several places later */
1080 rate_n_flags
= le32_to_cpu(phy_res
->rate_n_flags
);
1082 /* rx_status carries information about the packet to mac80211 */
1083 rx_status
.mactime
= le64_to_cpu(phy_res
->timestamp
);
1085 ieee80211_channel_to_frequency(le16_to_cpu(phy_res
->channel
));
1086 rx_status
.band
= (phy_res
->phy_flags
& RX_RES_PHY_FLAGS_BAND_24_MSK
) ?
1087 IEEE80211_BAND_2GHZ
: IEEE80211_BAND_5GHZ
;
1088 rx_status
.rate_idx
=
1089 iwl_hwrate_to_mac80211_idx(rate_n_flags
, rx_status
.band
);
1092 /* TSF isn't reliable. In order to allow smooth user experience,
1093 * this W/A doesn't propagate it to the mac80211 */
1094 /*rx_status.flag |= RX_FLAG_TSFT;*/
1096 priv
->ucode_beacon_time
= le32_to_cpu(phy_res
->beacon_time_stamp
);
1098 /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1099 rx_status
.signal
= iwl_calc_rssi(priv
, phy_res
);
1101 /* Meaningful noise values are available only from beacon statistics,
1102 * which are gathered only when associated, and indicate noise
1103 * only for the associated network channel ...
1104 * Ignore these noise values while scanning (other channels) */
1105 if (iwl_is_associated(priv
) &&
1106 !test_bit(STATUS_SCANNING
, &priv
->status
)) {
1107 rx_status
.noise
= priv
->last_rx_noise
;
1108 rx_status
.qual
= iwl_calc_sig_qual(rx_status
.signal
,
1111 rx_status
.noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
1112 rx_status
.qual
= iwl_calc_sig_qual(rx_status
.signal
, 0);
1115 /* Reset beacon noise level if not associated. */
1116 if (!iwl_is_associated(priv
))
1117 priv
->last_rx_noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
1119 #ifdef CONFIG_IWLWIFI_DEBUG
1120 /* Set "1" to report good data frames in groups of 100 */
1121 if (unlikely(iwl_get_debug_level(priv
) & IWL_DL_RX
))
1122 iwl_dbg_report_frame(priv
, phy_res
, len
, header
, 1);
1124 iwl_dbg_log_rx_data_frame(priv
, len
, header
);
1125 IWL_DEBUG_STATS_LIMIT(priv
, "Rssi %d, noise %d, qual %d, TSF %llu\n",
1126 rx_status
.signal
, rx_status
.noise
, rx_status
.qual
,
1127 (unsigned long long)rx_status
.mactime
);
1132 * It seems that the antenna field in the phy flags value
1133 * is actually a bit field. This is undefined by radiotap,
1134 * it wants an actual antenna number but I always get "7"
1135 * for most legacy frames I receive indicating that the
1136 * same frame was received on all three RX chains.
1138 * I think this field should be removed in favor of a
1139 * new 802.11n radiotap field "RX chains" that is defined
1143 (le16_to_cpu(phy_res
->phy_flags
) & RX_RES_PHY_FLAGS_ANTENNA_MSK
)
1144 >> RX_RES_PHY_FLAGS_ANTENNA_POS
;
1146 /* set the preamble flag if appropriate */
1147 if (phy_res
->phy_flags
& RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK
)
1148 rx_status
.flag
|= RX_FLAG_SHORTPRE
;
1150 /* Set up the HT phy flags */
1151 if (rate_n_flags
& RATE_MCS_HT_MSK
)
1152 rx_status
.flag
|= RX_FLAG_HT
;
1153 if (rate_n_flags
& RATE_MCS_HT40_MSK
)
1154 rx_status
.flag
|= RX_FLAG_40MHZ
;
1155 if (rate_n_flags
& RATE_MCS_SGI_MSK
)
1156 rx_status
.flag
|= RX_FLAG_SHORT_GI
;
1158 if (iwl_is_network_packet(priv
, header
)) {
1159 priv
->last_rx_rssi
= rx_status
.signal
;
1160 priv
->last_beacon_time
= priv
->ucode_beacon_time
;
1161 priv
->last_tsf
= le64_to_cpu(phy_res
->timestamp
);
1164 iwl_pass_packet_to_mac80211(priv
, header
, len
, ampdu_status
,
1167 EXPORT_SYMBOL(iwl_rx_reply_rx
);
1169 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1170 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1171 void iwl_rx_reply_rx_phy(struct iwl_priv
*priv
,
1172 struct iwl_rx_mem_buffer
*rxb
)
1174 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
1175 priv
->last_phy_res
[0] = 1;
1176 memcpy(&priv
->last_phy_res
[1], &(pkt
->u
.raw
[0]),
1177 sizeof(struct iwl_rx_phy_res
));
1179 EXPORT_SYMBOL(iwl_rx_reply_rx_phy
);