1 /******************************************************************************
3 * Copyright(c) 2003 - 2010 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 __iwl_free_pages(priv
, rxq
->pool
[i
].page
);
349 rxq
->pool
[i
].page
= NULL
;
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 __iwl_free_pages(priv
, rxq
->pool
[i
].page
);
418 rxq
->pool
[i
].page
= NULL
;
420 list_add_tail(&rxq
->pool
[i
].list
, &rxq
->rx_used
);
423 /* Set us so that we have processed and used all buffers, but have
424 * not restocked the Rx queue with fresh buffers */
425 rxq
->read
= rxq
->write
= 0;
426 rxq
->write_actual
= 0;
428 spin_unlock_irqrestore(&rxq
->lock
, flags
);
431 int iwl_rx_init(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
434 const u32 rfdnlog
= RX_QUEUE_SIZE_LOG
; /* 256 RBDs */
435 u32 rb_timeout
= 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
437 if (!priv
->cfg
->use_isr_legacy
)
438 rb_timeout
= RX_RB_TIMEOUT
;
440 if (priv
->cfg
->mod_params
->amsdu_size_8K
)
441 rb_size
= FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K
;
443 rb_size
= FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K
;
446 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
, 0);
448 /* Reset driver's Rx queue write index */
449 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_RBDCB_WPTR_REG
, 0);
451 /* Tell device where to find RBD circular buffer in DRAM */
452 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_RBDCB_BASE_REG
,
453 (u32
)(rxq
->dma_addr
>> 8));
455 /* Tell device where in DRAM to update its Rx status */
456 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_STTS_WPTR_REG
,
457 rxq
->rb_stts_dma
>> 4);
460 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
461 * the credit mechanism in 5000 HW RX FIFO
462 * Direct rx interrupts to hosts
463 * Rx buffer size 4 or 8k
467 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
,
468 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL
|
469 FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY
|
470 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL
|
471 FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK
|
473 (rb_timeout
<< FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS
)|
474 (rfdnlog
<< FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS
));
476 /* Set interrupt coalescing timer to default (2048 usecs) */
477 iwl_write8(priv
, CSR_INT_COALESCING
, IWL_HOST_INT_TIMEOUT_DEF
);
482 int iwl_rxq_stop(struct iwl_priv
*priv
)
486 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
, 0);
487 iwl_poll_direct_bit(priv
, FH_MEM_RSSR_RX_STATUS_REG
,
488 FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE
, 1000);
492 EXPORT_SYMBOL(iwl_rxq_stop
);
494 void iwl_rx_missed_beacon_notif(struct iwl_priv
*priv
,
495 struct iwl_rx_mem_buffer
*rxb
)
498 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
499 struct iwl_missed_beacon_notif
*missed_beacon
;
501 missed_beacon
= &pkt
->u
.missed_beacon
;
502 if (le32_to_cpu(missed_beacon
->consecutive_missed_beacons
) >
503 priv
->missed_beacon_threshold
) {
504 IWL_DEBUG_CALIB(priv
, "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
505 le32_to_cpu(missed_beacon
->consecutive_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
);
515 void iwl_rx_spectrum_measure_notif(struct iwl_priv
*priv
,
516 struct iwl_rx_mem_buffer
*rxb
)
518 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
519 struct iwl_spectrum_notification
*report
= &(pkt
->u
.spectrum_notif
);
521 if (!report
->state
) {
523 "Spectrum Measure Notification: Start\n");
527 memcpy(&priv
->measure_report
, report
, sizeof(*report
));
528 priv
->measurement_status
|= MEASUREMENT_READY
;
530 EXPORT_SYMBOL(iwl_rx_spectrum_measure_notif
);
534 /* Calculate noise level, based on measurements during network silence just
535 * before arriving beacon. This measurement can be done only if we know
536 * exactly when to expect beacons, therefore only when we're associated. */
537 static void iwl_rx_calc_noise(struct iwl_priv
*priv
)
539 struct statistics_rx_non_phy
*rx_info
540 = &(priv
->statistics
.rx
.general
);
541 int num_active_rx
= 0;
542 int total_silence
= 0;
544 le32_to_cpu(rx_info
->beacon_silence_rssi_a
) & IN_BAND_FILTER
;
546 le32_to_cpu(rx_info
->beacon_silence_rssi_b
) & IN_BAND_FILTER
;
548 le32_to_cpu(rx_info
->beacon_silence_rssi_c
) & IN_BAND_FILTER
;
551 total_silence
+= bcn_silence_a
;
555 total_silence
+= bcn_silence_b
;
559 total_silence
+= bcn_silence_c
;
563 /* Average among active antennas */
565 priv
->last_rx_noise
= (total_silence
/ num_active_rx
) - 107;
567 priv
->last_rx_noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
569 IWL_DEBUG_CALIB(priv
, "inband silence a %u, b %u, c %u, dBm %d\n",
570 bcn_silence_a
, bcn_silence_b
, bcn_silence_c
,
571 priv
->last_rx_noise
);
574 #ifdef CONFIG_IWLWIFI_DEBUG
576 * based on the assumption of all statistics counter are in DWORD
577 * FIXME: This function is for debugging, do not deal with
578 * the case of counters roll-over.
580 static void iwl_accumulative_statistics(struct iwl_priv
*priv
,
586 u32
*delta
, *max_delta
;
588 prev_stats
= (__le32
*)&priv
->statistics
;
589 accum_stats
= (u32
*)&priv
->accum_statistics
;
590 delta
= (u32
*)&priv
->delta_statistics
;
591 max_delta
= (u32
*)&priv
->max_delta
;
593 for (i
= sizeof(__le32
); i
< sizeof(struct iwl_notif_statistics
);
594 i
+= sizeof(__le32
), stats
++, prev_stats
++, delta
++,
595 max_delta
++, accum_stats
++) {
596 if (le32_to_cpu(*stats
) > le32_to_cpu(*prev_stats
)) {
597 *delta
= (le32_to_cpu(*stats
) -
598 le32_to_cpu(*prev_stats
));
599 *accum_stats
+= *delta
;
600 if (*delta
> *max_delta
)
605 /* reset accumulative statistics for "no-counter" type statistics */
606 priv
->accum_statistics
.general
.temperature
=
607 priv
->statistics
.general
.temperature
;
608 priv
->accum_statistics
.general
.temperature_m
=
609 priv
->statistics
.general
.temperature_m
;
610 priv
->accum_statistics
.general
.ttl_timestamp
=
611 priv
->statistics
.general
.ttl_timestamp
;
612 priv
->accum_statistics
.tx
.tx_power
.ant_a
=
613 priv
->statistics
.tx
.tx_power
.ant_a
;
614 priv
->accum_statistics
.tx
.tx_power
.ant_b
=
615 priv
->statistics
.tx
.tx_power
.ant_b
;
616 priv
->accum_statistics
.tx
.tx_power
.ant_c
=
617 priv
->statistics
.tx
.tx_power
.ant_c
;
621 #define REG_RECALIB_PERIOD (60)
623 #define PLCP_MSG "plcp_err exceeded %u, %u, %u, %u, %u, %d, %u mSecs\n"
624 void iwl_rx_statistics(struct iwl_priv
*priv
,
625 struct iwl_rx_mem_buffer
*rxb
)
628 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
629 int combined_plcp_delta
;
630 unsigned int plcp_msec
;
631 unsigned long plcp_received_jiffies
;
633 IWL_DEBUG_RX(priv
, "Statistics notification received (%d vs %d).\n",
634 (int)sizeof(priv
->statistics
),
635 le32_to_cpu(pkt
->len_n_flags
) & FH_RSCSR_FRAME_SIZE_MSK
);
637 change
= ((priv
->statistics
.general
.temperature
!=
638 pkt
->u
.stats
.general
.temperature
) ||
639 ((priv
->statistics
.flag
&
640 STATISTICS_REPLY_FLG_HT40_MODE_MSK
) !=
641 (pkt
->u
.stats
.flag
& STATISTICS_REPLY_FLG_HT40_MODE_MSK
)));
643 #ifdef CONFIG_IWLWIFI_DEBUG
644 iwl_accumulative_statistics(priv
, (__le32
*)&pkt
->u
.stats
);
647 * check for plcp_err and trigger radio reset if it exceeds
648 * the plcp error threshold plcp_delta.
650 plcp_received_jiffies
= jiffies
;
651 plcp_msec
= jiffies_to_msecs((long) plcp_received_jiffies
-
652 (long) priv
->plcp_jiffies
);
653 priv
->plcp_jiffies
= plcp_received_jiffies
;
655 * check to make sure plcp_msec is not 0 to prevent division
659 combined_plcp_delta
=
660 (le32_to_cpu(pkt
->u
.stats
.rx
.ofdm
.plcp_err
) -
661 le32_to_cpu(priv
->statistics
.rx
.ofdm
.plcp_err
)) +
662 (le32_to_cpu(pkt
->u
.stats
.rx
.ofdm_ht
.plcp_err
) -
663 le32_to_cpu(priv
->statistics
.rx
.ofdm_ht
.plcp_err
));
665 if ((combined_plcp_delta
> 0) &&
666 ((combined_plcp_delta
* 100) / plcp_msec
) >
667 priv
->cfg
->plcp_delta_threshold
) {
669 * if plcp_err exceed the threshold, the following
670 * data is printed in csv format:
671 * Text: plcp_err exceeded %d,
672 * Received ofdm.plcp_err,
673 * Current ofdm.plcp_err,
674 * Received ofdm_ht.plcp_err,
675 * Current ofdm_ht.plcp_err,
676 * combined_plcp_delta,
679 IWL_DEBUG_RADIO(priv
, PLCP_MSG
,
680 priv
->cfg
->plcp_delta_threshold
,
681 le32_to_cpu(pkt
->u
.stats
.rx
.ofdm
.plcp_err
),
682 le32_to_cpu(priv
->statistics
.rx
.ofdm
.plcp_err
),
683 le32_to_cpu(pkt
->u
.stats
.rx
.ofdm_ht
.plcp_err
),
685 priv
->statistics
.rx
.ofdm_ht
.plcp_err
),
686 combined_plcp_delta
, plcp_msec
);
689 * Reset the RF radio due to the high plcp
692 iwl_force_rf_reset(priv
);
696 memcpy(&priv
->statistics
, &pkt
->u
.stats
, sizeof(priv
->statistics
));
698 set_bit(STATUS_STATISTICS
, &priv
->status
);
700 /* Reschedule the statistics timer to occur in
701 * REG_RECALIB_PERIOD seconds to ensure we get a
702 * thermal update even if the uCode doesn't give
704 mod_timer(&priv
->statistics_periodic
, jiffies
+
705 msecs_to_jiffies(REG_RECALIB_PERIOD
* 1000));
707 if (unlikely(!test_bit(STATUS_SCANNING
, &priv
->status
)) &&
708 (pkt
->hdr
.cmd
== STATISTICS_NOTIFICATION
)) {
709 iwl_rx_calc_noise(priv
);
710 queue_work(priv
->workqueue
, &priv
->run_time_calib_work
);
712 if (priv
->cfg
->ops
->lib
->temp_ops
.temperature
&& change
)
713 priv
->cfg
->ops
->lib
->temp_ops
.temperature(priv
);
715 EXPORT_SYMBOL(iwl_rx_statistics
);
717 void iwl_reply_statistics(struct iwl_priv
*priv
,
718 struct iwl_rx_mem_buffer
*rxb
)
720 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
722 if (le32_to_cpu(pkt
->u
.stats
.flag
) & UCODE_STATISTICS_CLEAR_MSK
) {
723 #ifdef CONFIG_IWLWIFI_DEBUG
724 memset(&priv
->accum_statistics
, 0,
725 sizeof(struct iwl_notif_statistics
));
726 memset(&priv
->delta_statistics
, 0,
727 sizeof(struct iwl_notif_statistics
));
728 memset(&priv
->max_delta
, 0,
729 sizeof(struct iwl_notif_statistics
));
731 IWL_DEBUG_RX(priv
, "Statistics have been cleared\n");
733 iwl_rx_statistics(priv
, rxb
);
735 EXPORT_SYMBOL(iwl_reply_statistics
);
737 /* Calc max signal level (dBm) among 3 possible receivers */
738 static inline int iwl_calc_rssi(struct iwl_priv
*priv
,
739 struct iwl_rx_phy_res
*rx_resp
)
741 return priv
->cfg
->ops
->utils
->calc_rssi(priv
, rx_resp
);
744 #ifdef CONFIG_IWLWIFI_DEBUG
746 * iwl_dbg_report_frame - dump frame to syslog during debug sessions
748 * You may hack this function to show different aspects of received frames,
749 * including selective frame dumps.
750 * group100 parameter selects whether to show 1 out of 100 good data frames.
751 * All beacon and probe response frames are printed.
753 static void iwl_dbg_report_frame(struct iwl_priv
*priv
,
754 struct iwl_rx_phy_res
*phy_res
, u16 length
,
755 struct ieee80211_hdr
*header
, int group100
)
758 u32 print_summary
= 0;
759 u32 print_dump
= 0; /* set to 1 to dump all frames' contents */
770 if (likely(!(iwl_get_debug_level(priv
) & IWL_DL_RX
)))
774 fc
= header
->frame_control
;
775 seq_ctl
= le16_to_cpu(header
->seq_ctrl
);
778 channel
= le16_to_cpu(phy_res
->channel
);
779 phy_flags
= le16_to_cpu(phy_res
->phy_flags
);
780 rate_n_flags
= le32_to_cpu(phy_res
->rate_n_flags
);
782 /* signal statistics */
783 rssi
= iwl_calc_rssi(priv
, phy_res
);
784 tsf_low
= le64_to_cpu(phy_res
->timestamp
) & 0x0ffffffff;
786 to_us
= !compare_ether_addr(header
->addr1
, priv
->mac_addr
);
788 /* if data frame is to us and all is good,
789 * (optionally) print summary for only 1 out of every 100 */
790 if (to_us
&& (fc
& ~cpu_to_le16(IEEE80211_FCTL_PROTECTED
)) ==
791 cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FTYPE_DATA
)) {
794 print_summary
= 1; /* print each frame */
795 else if (priv
->framecnt_to_us
< 100) {
796 priv
->framecnt_to_us
++;
799 priv
->framecnt_to_us
= 0;
804 /* print summary for all other frames */
815 else if (ieee80211_has_retry(fc
))
817 else if (ieee80211_is_assoc_resp(fc
))
819 else if (ieee80211_is_reassoc_resp(fc
))
821 else if (ieee80211_is_probe_resp(fc
)) {
823 print_dump
= 1; /* dump frame contents */
824 } else if (ieee80211_is_beacon(fc
)) {
826 print_dump
= 1; /* dump frame contents */
827 } else if (ieee80211_is_atim(fc
))
829 else if (ieee80211_is_auth(fc
))
831 else if (ieee80211_is_deauth(fc
))
833 else if (ieee80211_is_disassoc(fc
))
838 rate_idx
= iwl_hwrate_to_plcp_idx(rate_n_flags
);
839 if (unlikely((rate_idx
< 0) || (rate_idx
>= IWL_RATE_COUNT
))) {
843 bitrate
= iwl_rates
[rate_idx
].ieee
/ 2;
846 /* print frame summary.
847 * MAC addresses show just the last byte (for brevity),
848 * but you can hack it to show more, if you'd like to. */
850 IWL_DEBUG_RX(priv
, "%s: mhd=0x%04x, dst=0x%02x, "
851 "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
852 title
, le16_to_cpu(fc
), header
->addr1
[5],
853 length
, rssi
, channel
, bitrate
);
855 /* src/dst addresses assume managed mode */
856 IWL_DEBUG_RX(priv
, "%s: 0x%04x, dst=0x%02x, src=0x%02x, "
857 "len=%u, rssi=%d, tim=%lu usec, "
858 "phy=0x%02x, chnl=%d\n",
859 title
, le16_to_cpu(fc
), header
->addr1
[5],
860 header
->addr3
[5], length
, rssi
,
861 tsf_low
- priv
->scan_start_tsf
,
866 iwl_print_hex_dump(priv
, IWL_DL_RX
, header
, length
);
871 * returns non-zero if packet should be dropped
873 int iwl_set_decrypted_flag(struct iwl_priv
*priv
,
874 struct ieee80211_hdr
*hdr
,
876 struct ieee80211_rx_status
*stats
)
878 u16 fc
= le16_to_cpu(hdr
->frame_control
);
880 if (priv
->active_rxon
.filter_flags
& RXON_FILTER_DIS_DECRYPT_MSK
)
883 if (!(fc
& IEEE80211_FCTL_PROTECTED
))
886 IWL_DEBUG_RX(priv
, "decrypt_res:0x%x\n", decrypt_res
);
887 switch (decrypt_res
& RX_RES_STATUS_SEC_TYPE_MSK
) {
888 case RX_RES_STATUS_SEC_TYPE_TKIP
:
889 /* The uCode has got a bad phase 1 Key, pushes the packet.
890 * Decryption will be done in SW. */
891 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
892 RX_RES_STATUS_BAD_KEY_TTAK
)
895 case RX_RES_STATUS_SEC_TYPE_WEP
:
896 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
897 RX_RES_STATUS_BAD_ICV_MIC
) {
898 /* bad ICV, the packet is destroyed since the
899 * decryption is inplace, drop it */
900 IWL_DEBUG_RX(priv
, "Packet destroyed\n");
903 case RX_RES_STATUS_SEC_TYPE_CCMP
:
904 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
905 RX_RES_STATUS_DECRYPT_OK
) {
906 IWL_DEBUG_RX(priv
, "hw decrypt successfully!!!\n");
907 stats
->flag
|= RX_FLAG_DECRYPTED
;
916 EXPORT_SYMBOL(iwl_set_decrypted_flag
);
918 static u32
iwl_translate_rx_status(struct iwl_priv
*priv
, u32 decrypt_in
)
922 if ((decrypt_in
& RX_RES_STATUS_STATION_FOUND
) ==
923 RX_RES_STATUS_STATION_FOUND
)
924 decrypt_out
|= (RX_RES_STATUS_STATION_FOUND
|
925 RX_RES_STATUS_NO_STATION_INFO_MISMATCH
);
927 decrypt_out
|= (decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
);
929 /* packet was not encrypted */
930 if ((decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) ==
931 RX_RES_STATUS_SEC_TYPE_NONE
)
934 /* packet was encrypted with unknown alg */
935 if ((decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) ==
936 RX_RES_STATUS_SEC_TYPE_ERR
)
939 /* decryption was not done in HW */
940 if ((decrypt_in
& RX_MPDU_RES_STATUS_DEC_DONE_MSK
) !=
941 RX_MPDU_RES_STATUS_DEC_DONE_MSK
)
944 switch (decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) {
946 case RX_RES_STATUS_SEC_TYPE_CCMP
:
947 /* alg is CCM: check MIC only */
948 if (!(decrypt_in
& RX_MPDU_RES_STATUS_MIC_OK
))
950 decrypt_out
|= RX_RES_STATUS_BAD_ICV_MIC
;
952 decrypt_out
|= RX_RES_STATUS_DECRYPT_OK
;
956 case RX_RES_STATUS_SEC_TYPE_TKIP
:
957 if (!(decrypt_in
& RX_MPDU_RES_STATUS_TTAK_OK
)) {
959 decrypt_out
|= RX_RES_STATUS_BAD_KEY_TTAK
;
962 /* fall through if TTAK OK */
964 if (!(decrypt_in
& RX_MPDU_RES_STATUS_ICV_OK
))
965 decrypt_out
|= RX_RES_STATUS_BAD_ICV_MIC
;
967 decrypt_out
|= RX_RES_STATUS_DECRYPT_OK
;
971 IWL_DEBUG_RX(priv
, "decrypt_in:0x%x decrypt_out = 0x%x\n",
972 decrypt_in
, decrypt_out
);
977 static void iwl_pass_packet_to_mac80211(struct iwl_priv
*priv
,
978 struct ieee80211_hdr
*hdr
,
981 struct iwl_rx_mem_buffer
*rxb
,
982 struct ieee80211_rx_status
*stats
)
986 __le16 fc
= hdr
->frame_control
;
988 /* We only process data packets if the interface is open */
989 if (unlikely(!priv
->is_open
)) {
990 IWL_DEBUG_DROP_LIMIT(priv
,
991 "Dropping packet while interface is not open.\n");
995 /* In case of HW accelerated crypto and bad decryption, drop */
996 if (!priv
->cfg
->mod_params
->sw_crypto
&&
997 iwl_set_decrypted_flag(priv
, hdr
, ampdu_status
, stats
))
1000 skb
= alloc_skb(IWL_LINK_HDR_MAX
* 2, GFP_ATOMIC
);
1002 IWL_ERR(priv
, "alloc_skb failed\n");
1006 skb_reserve(skb
, IWL_LINK_HDR_MAX
);
1007 skb_add_rx_frag(skb
, 0, rxb
->page
, (void *)hdr
- rxb_addr(rxb
), len
);
1009 /* mac80211 currently doesn't support paged SKB. Convert it to
1010 * linear SKB for management frame and data frame requires
1011 * software decryption or software defragementation. */
1012 if (ieee80211_is_mgmt(fc
) ||
1013 ieee80211_has_protected(fc
) ||
1014 ieee80211_has_morefrags(fc
) ||
1015 le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_FRAG
||
1016 (ieee80211_is_data_qos(fc
) &&
1017 *ieee80211_get_qos_ctl(hdr
) &
1018 IEEE80211_QOS_CONTROL_A_MSDU_PRESENT
))
1019 ret
= skb_linearize(skb
);
1021 ret
= __pskb_pull_tail(skb
, min_t(u16
, IWL_LINK_HDR_MAX
, len
)) ?
1030 * XXX: We cannot touch the page and its virtual memory (hdr) after
1031 * here. It might have already been freed by the above skb change.
1034 iwl_update_stats(priv
, false, fc
, len
);
1035 memcpy(IEEE80211_SKB_RXCB(skb
), stats
, sizeof(*stats
));
1037 ieee80211_rx(priv
->hw
, skb
);
1039 priv
->alloc_rxb_page
--;
1043 /* This is necessary only for a number of statistics, see the caller. */
1044 static int iwl_is_network_packet(struct iwl_priv
*priv
,
1045 struct ieee80211_hdr
*header
)
1047 /* Filter incoming packets to determine if they are targeted toward
1048 * this network, discarding packets coming from ourselves */
1049 switch (priv
->iw_mode
) {
1050 case NL80211_IFTYPE_ADHOC
: /* Header: Dest. | Source | BSSID */
1051 /* packets to our IBSS update information */
1052 return !compare_ether_addr(header
->addr3
, priv
->bssid
);
1053 case NL80211_IFTYPE_STATION
: /* Header: Dest. | AP{BSSID} | Source */
1054 /* packets to our IBSS update information */
1055 return !compare_ether_addr(header
->addr2
, priv
->bssid
);
1061 /* Called for REPLY_RX (legacy ABG frames), or
1062 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
1063 void iwl_rx_reply_rx(struct iwl_priv
*priv
,
1064 struct iwl_rx_mem_buffer
*rxb
)
1066 struct ieee80211_hdr
*header
;
1067 struct ieee80211_rx_status rx_status
;
1068 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
1069 struct iwl_rx_phy_res
*phy_res
;
1070 __le32 rx_pkt_status
;
1071 struct iwl4965_rx_mpdu_res_start
*amsdu
;
1077 * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
1078 * REPLY_RX: physical layer info is in this buffer
1079 * REPLY_RX_MPDU_CMD: physical layer info was sent in separate
1080 * command and cached in priv->last_phy_res
1082 * Here we set up local variables depending on which command is
1085 if (pkt
->hdr
.cmd
== REPLY_RX
) {
1086 phy_res
= (struct iwl_rx_phy_res
*)pkt
->u
.raw
;
1087 header
= (struct ieee80211_hdr
*)(pkt
->u
.raw
+ sizeof(*phy_res
)
1088 + phy_res
->cfg_phy_cnt
);
1090 len
= le16_to_cpu(phy_res
->byte_count
);
1091 rx_pkt_status
= *(__le32
*)(pkt
->u
.raw
+ sizeof(*phy_res
) +
1092 phy_res
->cfg_phy_cnt
+ len
);
1093 ampdu_status
= le32_to_cpu(rx_pkt_status
);
1095 if (!priv
->last_phy_res
[0]) {
1096 IWL_ERR(priv
, "MPDU frame without cached PHY data\n");
1099 phy_res
= (struct iwl_rx_phy_res
*)&priv
->last_phy_res
[1];
1100 amsdu
= (struct iwl4965_rx_mpdu_res_start
*)pkt
->u
.raw
;
1101 header
= (struct ieee80211_hdr
*)(pkt
->u
.raw
+ sizeof(*amsdu
));
1102 len
= le16_to_cpu(amsdu
->byte_count
);
1103 rx_pkt_status
= *(__le32
*)(pkt
->u
.raw
+ sizeof(*amsdu
) + len
);
1104 ampdu_status
= iwl_translate_rx_status(priv
,
1105 le32_to_cpu(rx_pkt_status
));
1108 if ((unlikely(phy_res
->cfg_phy_cnt
> 20))) {
1109 IWL_DEBUG_DROP(priv
, "dsp size out of range [0,20]: %d/n",
1110 phy_res
->cfg_phy_cnt
);
1114 if (!(rx_pkt_status
& RX_RES_STATUS_NO_CRC32_ERROR
) ||
1115 !(rx_pkt_status
& RX_RES_STATUS_NO_RXE_OVERFLOW
)) {
1116 IWL_DEBUG_RX(priv
, "Bad CRC or FIFO: 0x%08X.\n",
1117 le32_to_cpu(rx_pkt_status
));
1121 /* This will be used in several places later */
1122 rate_n_flags
= le32_to_cpu(phy_res
->rate_n_flags
);
1124 /* rx_status carries information about the packet to mac80211 */
1125 rx_status
.mactime
= le64_to_cpu(phy_res
->timestamp
);
1127 ieee80211_channel_to_frequency(le16_to_cpu(phy_res
->channel
));
1128 rx_status
.band
= (phy_res
->phy_flags
& RX_RES_PHY_FLAGS_BAND_24_MSK
) ?
1129 IEEE80211_BAND_2GHZ
: IEEE80211_BAND_5GHZ
;
1130 rx_status
.rate_idx
=
1131 iwl_hwrate_to_mac80211_idx(rate_n_flags
, rx_status
.band
);
1134 /* TSF isn't reliable. In order to allow smooth user experience,
1135 * this W/A doesn't propagate it to the mac80211 */
1136 /*rx_status.flag |= RX_FLAG_TSFT;*/
1138 priv
->ucode_beacon_time
= le32_to_cpu(phy_res
->beacon_time_stamp
);
1140 /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1141 rx_status
.signal
= iwl_calc_rssi(priv
, phy_res
);
1143 /* Meaningful noise values are available only from beacon statistics,
1144 * which are gathered only when associated, and indicate noise
1145 * only for the associated network channel ...
1146 * Ignore these noise values while scanning (other channels) */
1147 if (iwl_is_associated(priv
) &&
1148 !test_bit(STATUS_SCANNING
, &priv
->status
)) {
1149 rx_status
.noise
= priv
->last_rx_noise
;
1151 rx_status
.noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
1154 /* Reset beacon noise level if not associated. */
1155 if (!iwl_is_associated(priv
))
1156 priv
->last_rx_noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
1158 #ifdef CONFIG_IWLWIFI_DEBUG
1159 /* Set "1" to report good data frames in groups of 100 */
1160 if (unlikely(iwl_get_debug_level(priv
) & IWL_DL_RX
))
1161 iwl_dbg_report_frame(priv
, phy_res
, len
, header
, 1);
1163 iwl_dbg_log_rx_data_frame(priv
, len
, header
);
1164 IWL_DEBUG_STATS_LIMIT(priv
, "Rssi %d, noise %d, TSF %llu\n",
1165 rx_status
.signal
, rx_status
.noise
,
1166 (unsigned long long)rx_status
.mactime
);
1171 * It seems that the antenna field in the phy flags value
1172 * is actually a bit field. This is undefined by radiotap,
1173 * it wants an actual antenna number but I always get "7"
1174 * for most legacy frames I receive indicating that the
1175 * same frame was received on all three RX chains.
1177 * I think this field should be removed in favor of a
1178 * new 802.11n radiotap field "RX chains" that is defined
1182 (le16_to_cpu(phy_res
->phy_flags
) & RX_RES_PHY_FLAGS_ANTENNA_MSK
)
1183 >> RX_RES_PHY_FLAGS_ANTENNA_POS
;
1185 /* set the preamble flag if appropriate */
1186 if (phy_res
->phy_flags
& RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK
)
1187 rx_status
.flag
|= RX_FLAG_SHORTPRE
;
1189 /* Set up the HT phy flags */
1190 if (rate_n_flags
& RATE_MCS_HT_MSK
)
1191 rx_status
.flag
|= RX_FLAG_HT
;
1192 if (rate_n_flags
& RATE_MCS_HT40_MSK
)
1193 rx_status
.flag
|= RX_FLAG_40MHZ
;
1194 if (rate_n_flags
& RATE_MCS_SGI_MSK
)
1195 rx_status
.flag
|= RX_FLAG_SHORT_GI
;
1197 if (iwl_is_network_packet(priv
, header
)) {
1198 priv
->last_rx_rssi
= rx_status
.signal
;
1199 priv
->last_beacon_time
= priv
->ucode_beacon_time
;
1200 priv
->last_tsf
= le64_to_cpu(phy_res
->timestamp
);
1203 iwl_pass_packet_to_mac80211(priv
, header
, len
, ampdu_status
,
1206 EXPORT_SYMBOL(iwl_rx_reply_rx
);
1208 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1209 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1210 void iwl_rx_reply_rx_phy(struct iwl_priv
*priv
,
1211 struct iwl_rx_mem_buffer
*rxb
)
1213 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
1214 priv
->last_phy_res
[0] = 1;
1215 memcpy(&priv
->last_phy_res
[1], &(pkt
->u
.raw
[0]),
1216 sizeof(struct iwl_rx_phy_res
));
1218 EXPORT_SYMBOL(iwl_rx_reply_rx_phy
);