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 void 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
;
132 spin_lock_irqsave(&q
->lock
, flags
);
134 if (q
->need_update
== 0)
137 /* If power-saving is in use, make sure device is awake */
138 if (test_bit(STATUS_POWER_PMI
, &priv
->status
)) {
139 reg
= iwl_read32(priv
, CSR_UCODE_DRV_GP1
);
141 if (reg
& CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP
) {
142 IWL_DEBUG_INFO(priv
, "Rx queue requesting wakeup, GP1 = 0x%x\n",
144 iwl_set_bit(priv
, CSR_GP_CNTRL
,
145 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ
);
149 q
->write_actual
= (q
->write
& ~0x7);
150 iwl_write_direct32(priv
, rx_wrt_ptr_reg
, q
->write_actual
);
152 /* Else device is assumed to be awake */
154 /* Device expects a multiple of 8 */
155 q
->write_actual
= (q
->write
& ~0x7);
156 iwl_write_direct32(priv
, rx_wrt_ptr_reg
, q
->write_actual
);
162 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 void 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
;
193 spin_lock_irqsave(&rxq
->lock
, flags
);
194 write
= rxq
->write
& ~0x7;
195 while ((iwl_rx_queue_space(rxq
) > 0) && (rxq
->free_count
)) {
196 /* Get next free Rx buffer, remove from free list */
197 element
= rxq
->rx_free
.next
;
198 rxb
= list_entry(element
, struct iwl_rx_mem_buffer
, list
);
201 /* Point to Rx buffer via next RBD in circular buffer */
202 rxq
->bd
[rxq
->write
] = iwl_dma_addr2rbd_ptr(priv
, rxb
->page_dma
);
203 rxq
->queue
[rxq
->write
] = rxb
;
204 rxq
->write
= (rxq
->write
+ 1) & RX_QUEUE_MASK
;
207 spin_unlock_irqrestore(&rxq
->lock
, flags
);
208 /* If the pre-allocated buffer pool is dropping low, schedule to
210 if (rxq
->free_count
<= RX_LOW_WATERMARK
)
211 queue_work(priv
->workqueue
, &priv
->rx_replenish
);
214 /* If we've added more space for the firmware to place data, tell it.
215 * Increment device's write pointer in multiples of 8. */
216 if (rxq
->write_actual
!= (rxq
->write
& ~0x7)) {
217 spin_lock_irqsave(&rxq
->lock
, flags
);
218 rxq
->need_update
= 1;
219 spin_unlock_irqrestore(&rxq
->lock
, flags
);
220 iwl_rx_queue_update_write_ptr(priv
, rxq
);
223 EXPORT_SYMBOL(iwl_rx_queue_restock
);
227 * iwl_rx_replenish - Move all used packet from rx_used to rx_free
229 * When moving to rx_free an SKB is allocated for the slot.
231 * Also restock the Rx queue via iwl_rx_queue_restock.
232 * This is called as a scheduled work item (except for during initialization)
234 void iwl_rx_allocate(struct iwl_priv
*priv
, gfp_t priority
)
236 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
237 struct list_head
*element
;
238 struct iwl_rx_mem_buffer
*rxb
;
241 gfp_t gfp_mask
= priority
;
244 spin_lock_irqsave(&rxq
->lock
, flags
);
245 if (list_empty(&rxq
->rx_used
)) {
246 spin_unlock_irqrestore(&rxq
->lock
, flags
);
249 spin_unlock_irqrestore(&rxq
->lock
, flags
);
251 if (rxq
->free_count
> RX_LOW_WATERMARK
)
252 gfp_mask
|= __GFP_NOWARN
;
254 if (priv
->hw_params
.rx_page_order
> 0)
255 gfp_mask
|= __GFP_COMP
;
257 /* Alloc a new receive buffer */
258 page
= alloc_pages(gfp_mask
, priv
->hw_params
.rx_page_order
);
261 IWL_DEBUG_INFO(priv
, "alloc_pages failed, "
263 priv
->hw_params
.rx_page_order
);
265 if ((rxq
->free_count
<= RX_LOW_WATERMARK
) &&
267 IWL_CRIT(priv
, "Failed to alloc_pages with %s. Only %u free buffers remaining.\n",
268 priority
== GFP_ATOMIC
? "GFP_ATOMIC" : "GFP_KERNEL",
270 /* We don't reschedule replenish work here -- we will
271 * call the restock method and if it still needs
272 * more buffers it will schedule replenish */
276 spin_lock_irqsave(&rxq
->lock
, flags
);
278 if (list_empty(&rxq
->rx_used
)) {
279 spin_unlock_irqrestore(&rxq
->lock
, flags
);
280 __free_pages(page
, priv
->hw_params
.rx_page_order
);
283 element
= rxq
->rx_used
.next
;
284 rxb
= list_entry(element
, struct iwl_rx_mem_buffer
, list
);
287 spin_unlock_irqrestore(&rxq
->lock
, flags
);
290 /* Get physical address of the RB */
291 rxb
->page_dma
= pci_map_page(priv
->pci_dev
, page
, 0,
292 PAGE_SIZE
<< priv
->hw_params
.rx_page_order
,
294 /* dma address must be no more than 36 bits */
295 BUG_ON(rxb
->page_dma
& ~DMA_BIT_MASK(36));
296 /* and also 256 byte aligned! */
297 BUG_ON(rxb
->page_dma
& DMA_BIT_MASK(8));
299 spin_lock_irqsave(&rxq
->lock
, flags
);
301 list_add_tail(&rxb
->list
, &rxq
->rx_free
);
303 priv
->alloc_rxb_page
++;
305 spin_unlock_irqrestore(&rxq
->lock
, flags
);
309 void iwl_rx_replenish(struct iwl_priv
*priv
)
313 iwl_rx_allocate(priv
, GFP_KERNEL
);
315 spin_lock_irqsave(&priv
->lock
, flags
);
316 iwl_rx_queue_restock(priv
);
317 spin_unlock_irqrestore(&priv
->lock
, flags
);
319 EXPORT_SYMBOL(iwl_rx_replenish
);
321 void iwl_rx_replenish_now(struct iwl_priv
*priv
)
323 iwl_rx_allocate(priv
, GFP_ATOMIC
);
325 iwl_rx_queue_restock(priv
);
327 EXPORT_SYMBOL(iwl_rx_replenish_now
);
330 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
331 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
332 * This free routine walks the list of POOL entries and if SKB is set to
333 * non NULL it is unmapped and freed
335 void iwl_rx_queue_free(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
338 for (i
= 0; i
< RX_QUEUE_SIZE
+ RX_FREE_BUFFERS
; i
++) {
339 if (rxq
->pool
[i
].page
!= NULL
) {
340 pci_unmap_page(priv
->pci_dev
, rxq
->pool
[i
].page_dma
,
341 PAGE_SIZE
<< priv
->hw_params
.rx_page_order
,
343 __iwl_free_pages(priv
, rxq
->pool
[i
].page
);
344 rxq
->pool
[i
].page
= NULL
;
348 dma_free_coherent(&priv
->pci_dev
->dev
, 4 * RX_QUEUE_SIZE
, rxq
->bd
,
350 dma_free_coherent(&priv
->pci_dev
->dev
, sizeof(struct iwl_rb_status
),
351 rxq
->rb_stts
, rxq
->rb_stts_dma
);
355 EXPORT_SYMBOL(iwl_rx_queue_free
);
357 int iwl_rx_queue_alloc(struct iwl_priv
*priv
)
359 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
360 struct device
*dev
= &priv
->pci_dev
->dev
;
363 spin_lock_init(&rxq
->lock
);
364 INIT_LIST_HEAD(&rxq
->rx_free
);
365 INIT_LIST_HEAD(&rxq
->rx_used
);
367 /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
368 rxq
->bd
= dma_alloc_coherent(dev
, 4 * RX_QUEUE_SIZE
, &rxq
->dma_addr
,
373 rxq
->rb_stts
= dma_alloc_coherent(dev
, sizeof(struct iwl_rb_status
),
374 &rxq
->rb_stts_dma
, GFP_KERNEL
);
378 /* Fill the rx_used queue with _all_ of the Rx buffers */
379 for (i
= 0; i
< RX_FREE_BUFFERS
+ RX_QUEUE_SIZE
; i
++)
380 list_add_tail(&rxq
->pool
[i
].list
, &rxq
->rx_used
);
382 /* Set us so that we have processed and used all buffers, but have
383 * not restocked the Rx queue with fresh buffers */
384 rxq
->read
= rxq
->write
= 0;
385 rxq
->write_actual
= 0;
387 rxq
->need_update
= 0;
391 dma_free_coherent(&priv
->pci_dev
->dev
, 4 * RX_QUEUE_SIZE
, rxq
->bd
,
396 EXPORT_SYMBOL(iwl_rx_queue_alloc
);
398 void iwl_rx_queue_reset(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
402 spin_lock_irqsave(&rxq
->lock
, flags
);
403 INIT_LIST_HEAD(&rxq
->rx_free
);
404 INIT_LIST_HEAD(&rxq
->rx_used
);
405 /* Fill the rx_used queue with _all_ of the Rx buffers */
406 for (i
= 0; i
< RX_FREE_BUFFERS
+ RX_QUEUE_SIZE
; i
++) {
407 /* In the reset function, these buffers may have been allocated
408 * to an SKB, so we need to unmap and free potential storage */
409 if (rxq
->pool
[i
].page
!= NULL
) {
410 pci_unmap_page(priv
->pci_dev
, rxq
->pool
[i
].page_dma
,
411 PAGE_SIZE
<< priv
->hw_params
.rx_page_order
,
413 __iwl_free_pages(priv
, rxq
->pool
[i
].page
);
414 rxq
->pool
[i
].page
= NULL
;
416 list_add_tail(&rxq
->pool
[i
].list
, &rxq
->rx_used
);
419 /* Set us so that we have processed and used all buffers, but have
420 * not restocked the Rx queue with fresh buffers */
421 rxq
->read
= rxq
->write
= 0;
422 rxq
->write_actual
= 0;
424 spin_unlock_irqrestore(&rxq
->lock
, flags
);
427 int iwl_rx_init(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
430 const u32 rfdnlog
= RX_QUEUE_SIZE_LOG
; /* 256 RBDs */
431 u32 rb_timeout
= 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
433 if (!priv
->cfg
->use_isr_legacy
)
434 rb_timeout
= RX_RB_TIMEOUT
;
436 if (priv
->cfg
->mod_params
->amsdu_size_8K
)
437 rb_size
= FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K
;
439 rb_size
= FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K
;
442 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
, 0);
444 /* Reset driver's Rx queue write index */
445 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_RBDCB_WPTR_REG
, 0);
447 /* Tell device where to find RBD circular buffer in DRAM */
448 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_RBDCB_BASE_REG
,
449 (u32
)(rxq
->dma_addr
>> 8));
451 /* Tell device where in DRAM to update its Rx status */
452 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_STTS_WPTR_REG
,
453 rxq
->rb_stts_dma
>> 4);
456 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
457 * the credit mechanism in 5000 HW RX FIFO
458 * Direct rx interrupts to hosts
459 * Rx buffer size 4 or 8k
463 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
,
464 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL
|
465 FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY
|
466 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL
|
467 FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK
|
469 (rb_timeout
<< FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS
)|
470 (rfdnlog
<< FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS
));
472 /* Set interrupt coalescing timer to default (2048 usecs) */
473 iwl_write8(priv
, CSR_INT_COALESCING
, IWL_HOST_INT_TIMEOUT_DEF
);
478 int iwl_rxq_stop(struct iwl_priv
*priv
)
482 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
, 0);
483 iwl_poll_direct_bit(priv
, FH_MEM_RSSR_RX_STATUS_REG
,
484 FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE
, 1000);
488 EXPORT_SYMBOL(iwl_rxq_stop
);
490 void iwl_rx_missed_beacon_notif(struct iwl_priv
*priv
,
491 struct iwl_rx_mem_buffer
*rxb
)
494 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
495 struct iwl_missed_beacon_notif
*missed_beacon
;
497 missed_beacon
= &pkt
->u
.missed_beacon
;
498 if (le32_to_cpu(missed_beacon
->consecutive_missed_beacons
) >
499 priv
->missed_beacon_threshold
) {
500 IWL_DEBUG_CALIB(priv
, "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
501 le32_to_cpu(missed_beacon
->consecutive_missed_beacons
),
502 le32_to_cpu(missed_beacon
->total_missed_becons
),
503 le32_to_cpu(missed_beacon
->num_recvd_beacons
),
504 le32_to_cpu(missed_beacon
->num_expected_beacons
));
505 if (!test_bit(STATUS_SCANNING
, &priv
->status
))
506 iwl_init_sensitivity(priv
);
509 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif
);
511 void iwl_rx_spectrum_measure_notif(struct iwl_priv
*priv
,
512 struct iwl_rx_mem_buffer
*rxb
)
514 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
515 struct iwl_spectrum_notification
*report
= &(pkt
->u
.spectrum_notif
);
517 if (!report
->state
) {
519 "Spectrum Measure Notification: Start\n");
523 memcpy(&priv
->measure_report
, report
, sizeof(*report
));
524 priv
->measurement_status
|= MEASUREMENT_READY
;
526 EXPORT_SYMBOL(iwl_rx_spectrum_measure_notif
);
530 /* Calculate noise level, based on measurements during network silence just
531 * before arriving beacon. This measurement can be done only if we know
532 * exactly when to expect beacons, therefore only when we're associated. */
533 static void iwl_rx_calc_noise(struct iwl_priv
*priv
)
535 struct statistics_rx_non_phy
*rx_info
536 = &(priv
->statistics
.rx
.general
);
537 int num_active_rx
= 0;
538 int total_silence
= 0;
540 le32_to_cpu(rx_info
->beacon_silence_rssi_a
) & IN_BAND_FILTER
;
542 le32_to_cpu(rx_info
->beacon_silence_rssi_b
) & IN_BAND_FILTER
;
544 le32_to_cpu(rx_info
->beacon_silence_rssi_c
) & IN_BAND_FILTER
;
547 total_silence
+= bcn_silence_a
;
551 total_silence
+= bcn_silence_b
;
555 total_silence
+= bcn_silence_c
;
559 /* Average among active antennas */
561 priv
->last_rx_noise
= (total_silence
/ num_active_rx
) - 107;
563 priv
->last_rx_noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
565 IWL_DEBUG_CALIB(priv
, "inband silence a %u, b %u, c %u, dBm %d\n",
566 bcn_silence_a
, bcn_silence_b
, bcn_silence_c
,
567 priv
->last_rx_noise
);
570 #ifdef CONFIG_IWLWIFI_DEBUG
572 * based on the assumption of all statistics counter are in DWORD
573 * FIXME: This function is for debugging, do not deal with
574 * the case of counters roll-over.
576 static void iwl_accumulative_statistics(struct iwl_priv
*priv
,
582 u32
*delta
, *max_delta
;
584 prev_stats
= (__le32
*)&priv
->statistics
;
585 accum_stats
= (u32
*)&priv
->accum_statistics
;
586 delta
= (u32
*)&priv
->delta_statistics
;
587 max_delta
= (u32
*)&priv
->max_delta
;
589 for (i
= sizeof(__le32
); i
< sizeof(struct iwl_notif_statistics
);
590 i
+= sizeof(__le32
), stats
++, prev_stats
++, delta
++,
591 max_delta
++, accum_stats
++) {
592 if (le32_to_cpu(*stats
) > le32_to_cpu(*prev_stats
)) {
593 *delta
= (le32_to_cpu(*stats
) -
594 le32_to_cpu(*prev_stats
));
595 *accum_stats
+= *delta
;
596 if (*delta
> *max_delta
)
601 /* reset accumulative statistics for "no-counter" type statistics */
602 priv
->accum_statistics
.general
.temperature
=
603 priv
->statistics
.general
.temperature
;
604 priv
->accum_statistics
.general
.temperature_m
=
605 priv
->statistics
.general
.temperature_m
;
606 priv
->accum_statistics
.general
.ttl_timestamp
=
607 priv
->statistics
.general
.ttl_timestamp
;
608 priv
->accum_statistics
.tx
.tx_power
.ant_a
=
609 priv
->statistics
.tx
.tx_power
.ant_a
;
610 priv
->accum_statistics
.tx
.tx_power
.ant_b
=
611 priv
->statistics
.tx
.tx_power
.ant_b
;
612 priv
->accum_statistics
.tx
.tx_power
.ant_c
=
613 priv
->statistics
.tx
.tx_power
.ant_c
;
617 #define REG_RECALIB_PERIOD (60)
619 #define PLCP_MSG "plcp_err exceeded %u, %u, %u, %u, %u, %d, %u mSecs\n"
620 void iwl_rx_statistics(struct iwl_priv
*priv
,
621 struct iwl_rx_mem_buffer
*rxb
)
624 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
625 int combined_plcp_delta
;
626 unsigned int plcp_msec
;
627 unsigned long plcp_received_jiffies
;
629 IWL_DEBUG_RX(priv
, "Statistics notification received (%d vs %d).\n",
630 (int)sizeof(priv
->statistics
),
631 le32_to_cpu(pkt
->len_n_flags
) & FH_RSCSR_FRAME_SIZE_MSK
);
633 change
= ((priv
->statistics
.general
.temperature
!=
634 pkt
->u
.stats
.general
.temperature
) ||
635 ((priv
->statistics
.flag
&
636 STATISTICS_REPLY_FLG_HT40_MODE_MSK
) !=
637 (pkt
->u
.stats
.flag
& STATISTICS_REPLY_FLG_HT40_MODE_MSK
)));
639 #ifdef CONFIG_IWLWIFI_DEBUG
640 iwl_accumulative_statistics(priv
, (__le32
*)&pkt
->u
.stats
);
643 * check for plcp_err and trigger radio reset if it exceeds
644 * the plcp error threshold plcp_delta.
646 plcp_received_jiffies
= jiffies
;
647 plcp_msec
= jiffies_to_msecs((long) plcp_received_jiffies
-
648 (long) priv
->plcp_jiffies
);
649 priv
->plcp_jiffies
= plcp_received_jiffies
;
651 * check to make sure plcp_msec is not 0 to prevent division
655 combined_plcp_delta
=
656 (le32_to_cpu(pkt
->u
.stats
.rx
.ofdm
.plcp_err
) -
657 le32_to_cpu(priv
->statistics
.rx
.ofdm
.plcp_err
)) +
658 (le32_to_cpu(pkt
->u
.stats
.rx
.ofdm_ht
.plcp_err
) -
659 le32_to_cpu(priv
->statistics
.rx
.ofdm_ht
.plcp_err
));
661 if ((combined_plcp_delta
> 0) &&
662 ((combined_plcp_delta
* 100) / plcp_msec
) >
663 priv
->cfg
->plcp_delta_threshold
) {
665 * if plcp_err exceed the threshold, the following
666 * data is printed in csv format:
667 * Text: plcp_err exceeded %d,
668 * Received ofdm.plcp_err,
669 * Current ofdm.plcp_err,
670 * Received ofdm_ht.plcp_err,
671 * Current ofdm_ht.plcp_err,
672 * combined_plcp_delta,
675 IWL_DEBUG_RADIO(priv
, PLCP_MSG
,
676 priv
->cfg
->plcp_delta_threshold
,
677 le32_to_cpu(pkt
->u
.stats
.rx
.ofdm
.plcp_err
),
678 le32_to_cpu(priv
->statistics
.rx
.ofdm
.plcp_err
),
679 le32_to_cpu(pkt
->u
.stats
.rx
.ofdm_ht
.plcp_err
),
681 priv
->statistics
.rx
.ofdm_ht
.plcp_err
),
682 combined_plcp_delta
, plcp_msec
);
685 * Reset the RF radio due to the high plcp
688 iwl_force_reset(priv
, IWL_RF_RESET
);
692 memcpy(&priv
->statistics
, &pkt
->u
.stats
, sizeof(priv
->statistics
));
694 set_bit(STATUS_STATISTICS
, &priv
->status
);
696 /* Reschedule the statistics timer to occur in
697 * REG_RECALIB_PERIOD seconds to ensure we get a
698 * thermal update even if the uCode doesn't give
700 mod_timer(&priv
->statistics_periodic
, jiffies
+
701 msecs_to_jiffies(REG_RECALIB_PERIOD
* 1000));
703 if (unlikely(!test_bit(STATUS_SCANNING
, &priv
->status
)) &&
704 (pkt
->hdr
.cmd
== STATISTICS_NOTIFICATION
)) {
705 iwl_rx_calc_noise(priv
);
706 queue_work(priv
->workqueue
, &priv
->run_time_calib_work
);
708 if (priv
->cfg
->ops
->lib
->temp_ops
.temperature
&& change
)
709 priv
->cfg
->ops
->lib
->temp_ops
.temperature(priv
);
711 EXPORT_SYMBOL(iwl_rx_statistics
);
713 void iwl_reply_statistics(struct iwl_priv
*priv
,
714 struct iwl_rx_mem_buffer
*rxb
)
716 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
718 if (le32_to_cpu(pkt
->u
.stats
.flag
) & UCODE_STATISTICS_CLEAR_MSK
) {
719 #ifdef CONFIG_IWLWIFI_DEBUG
720 memset(&priv
->accum_statistics
, 0,
721 sizeof(struct iwl_notif_statistics
));
722 memset(&priv
->delta_statistics
, 0,
723 sizeof(struct iwl_notif_statistics
));
724 memset(&priv
->max_delta
, 0,
725 sizeof(struct iwl_notif_statistics
));
727 IWL_DEBUG_RX(priv
, "Statistics have been cleared\n");
729 iwl_rx_statistics(priv
, rxb
);
731 EXPORT_SYMBOL(iwl_reply_statistics
);
733 /* Calc max signal level (dBm) among 3 possible receivers */
734 static inline int iwl_calc_rssi(struct iwl_priv
*priv
,
735 struct iwl_rx_phy_res
*rx_resp
)
737 return priv
->cfg
->ops
->utils
->calc_rssi(priv
, rx_resp
);
740 #ifdef CONFIG_IWLWIFI_DEBUG
742 * iwl_dbg_report_frame - dump frame to syslog during debug sessions
744 * You may hack this function to show different aspects of received frames,
745 * including selective frame dumps.
746 * group100 parameter selects whether to show 1 out of 100 good data frames.
747 * All beacon and probe response frames are printed.
749 static void iwl_dbg_report_frame(struct iwl_priv
*priv
,
750 struct iwl_rx_phy_res
*phy_res
, u16 length
,
751 struct ieee80211_hdr
*header
, int group100
)
754 u32 print_summary
= 0;
755 u32 print_dump
= 0; /* set to 1 to dump all frames' contents */
766 if (likely(!(iwl_get_debug_level(priv
) & IWL_DL_RX
)))
770 fc
= header
->frame_control
;
771 seq_ctl
= le16_to_cpu(header
->seq_ctrl
);
774 channel
= le16_to_cpu(phy_res
->channel
);
775 phy_flags
= le16_to_cpu(phy_res
->phy_flags
);
776 rate_n_flags
= le32_to_cpu(phy_res
->rate_n_flags
);
778 /* signal statistics */
779 rssi
= iwl_calc_rssi(priv
, phy_res
);
780 tsf_low
= le64_to_cpu(phy_res
->timestamp
) & 0x0ffffffff;
782 to_us
= !compare_ether_addr(header
->addr1
, priv
->mac_addr
);
784 /* if data frame is to us and all is good,
785 * (optionally) print summary for only 1 out of every 100 */
786 if (to_us
&& (fc
& ~cpu_to_le16(IEEE80211_FCTL_PROTECTED
)) ==
787 cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FTYPE_DATA
)) {
790 print_summary
= 1; /* print each frame */
791 else if (priv
->framecnt_to_us
< 100) {
792 priv
->framecnt_to_us
++;
795 priv
->framecnt_to_us
= 0;
800 /* print summary for all other frames */
811 else if (ieee80211_has_retry(fc
))
813 else if (ieee80211_is_assoc_resp(fc
))
815 else if (ieee80211_is_reassoc_resp(fc
))
817 else if (ieee80211_is_probe_resp(fc
)) {
819 print_dump
= 1; /* dump frame contents */
820 } else if (ieee80211_is_beacon(fc
)) {
822 print_dump
= 1; /* dump frame contents */
823 } else if (ieee80211_is_atim(fc
))
825 else if (ieee80211_is_auth(fc
))
827 else if (ieee80211_is_deauth(fc
))
829 else if (ieee80211_is_disassoc(fc
))
834 rate_idx
= iwl_hwrate_to_plcp_idx(rate_n_flags
);
835 if (unlikely((rate_idx
< 0) || (rate_idx
>= IWL_RATE_COUNT
))) {
839 bitrate
= iwl_rates
[rate_idx
].ieee
/ 2;
842 /* print frame summary.
843 * MAC addresses show just the last byte (for brevity),
844 * but you can hack it to show more, if you'd like to. */
846 IWL_DEBUG_RX(priv
, "%s: mhd=0x%04x, dst=0x%02x, "
847 "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
848 title
, le16_to_cpu(fc
), header
->addr1
[5],
849 length
, rssi
, channel
, bitrate
);
851 /* src/dst addresses assume managed mode */
852 IWL_DEBUG_RX(priv
, "%s: 0x%04x, dst=0x%02x, src=0x%02x, "
853 "len=%u, rssi=%d, tim=%lu usec, "
854 "phy=0x%02x, chnl=%d\n",
855 title
, le16_to_cpu(fc
), header
->addr1
[5],
856 header
->addr3
[5], length
, rssi
,
857 tsf_low
- priv
->scan_start_tsf
,
862 iwl_print_hex_dump(priv
, IWL_DL_RX
, header
, length
);
867 * returns non-zero if packet should be dropped
869 int iwl_set_decrypted_flag(struct iwl_priv
*priv
,
870 struct ieee80211_hdr
*hdr
,
872 struct ieee80211_rx_status
*stats
)
874 u16 fc
= le16_to_cpu(hdr
->frame_control
);
876 if (priv
->active_rxon
.filter_flags
& RXON_FILTER_DIS_DECRYPT_MSK
)
879 if (!(fc
& IEEE80211_FCTL_PROTECTED
))
882 IWL_DEBUG_RX(priv
, "decrypt_res:0x%x\n", decrypt_res
);
883 switch (decrypt_res
& RX_RES_STATUS_SEC_TYPE_MSK
) {
884 case RX_RES_STATUS_SEC_TYPE_TKIP
:
885 /* The uCode has got a bad phase 1 Key, pushes the packet.
886 * Decryption will be done in SW. */
887 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
888 RX_RES_STATUS_BAD_KEY_TTAK
)
891 case RX_RES_STATUS_SEC_TYPE_WEP
:
892 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
893 RX_RES_STATUS_BAD_ICV_MIC
) {
894 /* bad ICV, the packet is destroyed since the
895 * decryption is inplace, drop it */
896 IWL_DEBUG_RX(priv
, "Packet destroyed\n");
899 case RX_RES_STATUS_SEC_TYPE_CCMP
:
900 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
901 RX_RES_STATUS_DECRYPT_OK
) {
902 IWL_DEBUG_RX(priv
, "hw decrypt successfully!!!\n");
903 stats
->flag
|= RX_FLAG_DECRYPTED
;
912 EXPORT_SYMBOL(iwl_set_decrypted_flag
);
914 static u32
iwl_translate_rx_status(struct iwl_priv
*priv
, u32 decrypt_in
)
918 if ((decrypt_in
& RX_RES_STATUS_STATION_FOUND
) ==
919 RX_RES_STATUS_STATION_FOUND
)
920 decrypt_out
|= (RX_RES_STATUS_STATION_FOUND
|
921 RX_RES_STATUS_NO_STATION_INFO_MISMATCH
);
923 decrypt_out
|= (decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
);
925 /* packet was not encrypted */
926 if ((decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) ==
927 RX_RES_STATUS_SEC_TYPE_NONE
)
930 /* packet was encrypted with unknown alg */
931 if ((decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) ==
932 RX_RES_STATUS_SEC_TYPE_ERR
)
935 /* decryption was not done in HW */
936 if ((decrypt_in
& RX_MPDU_RES_STATUS_DEC_DONE_MSK
) !=
937 RX_MPDU_RES_STATUS_DEC_DONE_MSK
)
940 switch (decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) {
942 case RX_RES_STATUS_SEC_TYPE_CCMP
:
943 /* alg is CCM: check MIC only */
944 if (!(decrypt_in
& RX_MPDU_RES_STATUS_MIC_OK
))
946 decrypt_out
|= RX_RES_STATUS_BAD_ICV_MIC
;
948 decrypt_out
|= RX_RES_STATUS_DECRYPT_OK
;
952 case RX_RES_STATUS_SEC_TYPE_TKIP
:
953 if (!(decrypt_in
& RX_MPDU_RES_STATUS_TTAK_OK
)) {
955 decrypt_out
|= RX_RES_STATUS_BAD_KEY_TTAK
;
958 /* fall through if TTAK OK */
960 if (!(decrypt_in
& RX_MPDU_RES_STATUS_ICV_OK
))
961 decrypt_out
|= RX_RES_STATUS_BAD_ICV_MIC
;
963 decrypt_out
|= RX_RES_STATUS_DECRYPT_OK
;
967 IWL_DEBUG_RX(priv
, "decrypt_in:0x%x decrypt_out = 0x%x\n",
968 decrypt_in
, decrypt_out
);
973 static void iwl_pass_packet_to_mac80211(struct iwl_priv
*priv
,
974 struct ieee80211_hdr
*hdr
,
977 struct iwl_rx_mem_buffer
*rxb
,
978 struct ieee80211_rx_status
*stats
)
982 __le16 fc
= hdr
->frame_control
;
984 /* We only process data packets if the interface is open */
985 if (unlikely(!priv
->is_open
)) {
986 IWL_DEBUG_DROP_LIMIT(priv
,
987 "Dropping packet while interface is not open.\n");
991 /* In case of HW accelerated crypto and bad decryption, drop */
992 if (!priv
->cfg
->mod_params
->sw_crypto
&&
993 iwl_set_decrypted_flag(priv
, hdr
, ampdu_status
, stats
))
996 skb
= alloc_skb(IWL_LINK_HDR_MAX
* 2, GFP_ATOMIC
);
998 IWL_ERR(priv
, "alloc_skb failed\n");
1002 skb_reserve(skb
, IWL_LINK_HDR_MAX
);
1003 skb_add_rx_frag(skb
, 0, rxb
->page
, (void *)hdr
- rxb_addr(rxb
), len
);
1005 /* mac80211 currently doesn't support paged SKB. Convert it to
1006 * linear SKB for management frame and data frame requires
1007 * software decryption or software defragementation. */
1008 if (ieee80211_is_mgmt(fc
) ||
1009 ieee80211_has_protected(fc
) ||
1010 ieee80211_has_morefrags(fc
) ||
1011 le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_FRAG
||
1012 (ieee80211_is_data_qos(fc
) &&
1013 *ieee80211_get_qos_ctl(hdr
) &
1014 IEEE80211_QOS_CONTROL_A_MSDU_PRESENT
))
1015 ret
= skb_linearize(skb
);
1017 ret
= __pskb_pull_tail(skb
, min_t(u16
, IWL_LINK_HDR_MAX
, len
)) ?
1026 * XXX: We cannot touch the page and its virtual memory (hdr) after
1027 * here. It might have already been freed by the above skb change.
1030 iwl_update_stats(priv
, false, fc
, len
);
1031 memcpy(IEEE80211_SKB_RXCB(skb
), stats
, sizeof(*stats
));
1033 ieee80211_rx(priv
->hw
, skb
);
1035 priv
->alloc_rxb_page
--;
1039 /* This is necessary only for a number of statistics, see the caller. */
1040 static int iwl_is_network_packet(struct iwl_priv
*priv
,
1041 struct ieee80211_hdr
*header
)
1043 /* Filter incoming packets to determine if they are targeted toward
1044 * this network, discarding packets coming from ourselves */
1045 switch (priv
->iw_mode
) {
1046 case NL80211_IFTYPE_ADHOC
: /* Header: Dest. | Source | BSSID */
1047 /* packets to our IBSS update information */
1048 return !compare_ether_addr(header
->addr3
, priv
->bssid
);
1049 case NL80211_IFTYPE_STATION
: /* Header: Dest. | AP{BSSID} | Source */
1050 /* packets to our IBSS update information */
1051 return !compare_ether_addr(header
->addr2
, priv
->bssid
);
1057 /* Called for REPLY_RX (legacy ABG frames), or
1058 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
1059 void iwl_rx_reply_rx(struct iwl_priv
*priv
,
1060 struct iwl_rx_mem_buffer
*rxb
)
1062 struct ieee80211_hdr
*header
;
1063 struct ieee80211_rx_status rx_status
;
1064 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
1065 struct iwl_rx_phy_res
*phy_res
;
1066 __le32 rx_pkt_status
;
1067 struct iwl4965_rx_mpdu_res_start
*amsdu
;
1073 * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
1074 * REPLY_RX: physical layer info is in this buffer
1075 * REPLY_RX_MPDU_CMD: physical layer info was sent in separate
1076 * command and cached in priv->last_phy_res
1078 * Here we set up local variables depending on which command is
1081 if (pkt
->hdr
.cmd
== REPLY_RX
) {
1082 phy_res
= (struct iwl_rx_phy_res
*)pkt
->u
.raw
;
1083 header
= (struct ieee80211_hdr
*)(pkt
->u
.raw
+ sizeof(*phy_res
)
1084 + phy_res
->cfg_phy_cnt
);
1086 len
= le16_to_cpu(phy_res
->byte_count
);
1087 rx_pkt_status
= *(__le32
*)(pkt
->u
.raw
+ sizeof(*phy_res
) +
1088 phy_res
->cfg_phy_cnt
+ len
);
1089 ampdu_status
= le32_to_cpu(rx_pkt_status
);
1091 if (!priv
->last_phy_res
[0]) {
1092 IWL_ERR(priv
, "MPDU frame without cached PHY data\n");
1095 phy_res
= (struct iwl_rx_phy_res
*)&priv
->last_phy_res
[1];
1096 amsdu
= (struct iwl4965_rx_mpdu_res_start
*)pkt
->u
.raw
;
1097 header
= (struct ieee80211_hdr
*)(pkt
->u
.raw
+ sizeof(*amsdu
));
1098 len
= le16_to_cpu(amsdu
->byte_count
);
1099 rx_pkt_status
= *(__le32
*)(pkt
->u
.raw
+ sizeof(*amsdu
) + len
);
1100 ampdu_status
= iwl_translate_rx_status(priv
,
1101 le32_to_cpu(rx_pkt_status
));
1104 if ((unlikely(phy_res
->cfg_phy_cnt
> 20))) {
1105 IWL_DEBUG_DROP(priv
, "dsp size out of range [0,20]: %d/n",
1106 phy_res
->cfg_phy_cnt
);
1110 if (!(rx_pkt_status
& RX_RES_STATUS_NO_CRC32_ERROR
) ||
1111 !(rx_pkt_status
& RX_RES_STATUS_NO_RXE_OVERFLOW
)) {
1112 IWL_DEBUG_RX(priv
, "Bad CRC or FIFO: 0x%08X.\n",
1113 le32_to_cpu(rx_pkt_status
));
1117 /* This will be used in several places later */
1118 rate_n_flags
= le32_to_cpu(phy_res
->rate_n_flags
);
1120 /* rx_status carries information about the packet to mac80211 */
1121 rx_status
.mactime
= le64_to_cpu(phy_res
->timestamp
);
1123 ieee80211_channel_to_frequency(le16_to_cpu(phy_res
->channel
));
1124 rx_status
.band
= (phy_res
->phy_flags
& RX_RES_PHY_FLAGS_BAND_24_MSK
) ?
1125 IEEE80211_BAND_2GHZ
: IEEE80211_BAND_5GHZ
;
1126 rx_status
.rate_idx
=
1127 iwl_hwrate_to_mac80211_idx(rate_n_flags
, rx_status
.band
);
1130 /* TSF isn't reliable. In order to allow smooth user experience,
1131 * this W/A doesn't propagate it to the mac80211 */
1132 /*rx_status.flag |= RX_FLAG_TSFT;*/
1134 priv
->ucode_beacon_time
= le32_to_cpu(phy_res
->beacon_time_stamp
);
1136 /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1137 rx_status
.signal
= iwl_calc_rssi(priv
, phy_res
);
1139 /* Meaningful noise values are available only from beacon statistics,
1140 * which are gathered only when associated, and indicate noise
1141 * only for the associated network channel ...
1142 * Ignore these noise values while scanning (other channels) */
1143 if (iwl_is_associated(priv
) &&
1144 !test_bit(STATUS_SCANNING
, &priv
->status
)) {
1145 rx_status
.noise
= priv
->last_rx_noise
;
1147 rx_status
.noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
1150 /* Reset beacon noise level if not associated. */
1151 if (!iwl_is_associated(priv
))
1152 priv
->last_rx_noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
1154 #ifdef CONFIG_IWLWIFI_DEBUG
1155 /* Set "1" to report good data frames in groups of 100 */
1156 if (unlikely(iwl_get_debug_level(priv
) & IWL_DL_RX
))
1157 iwl_dbg_report_frame(priv
, phy_res
, len
, header
, 1);
1159 iwl_dbg_log_rx_data_frame(priv
, len
, header
);
1160 IWL_DEBUG_STATS_LIMIT(priv
, "Rssi %d, noise %d, TSF %llu\n",
1161 rx_status
.signal
, rx_status
.noise
,
1162 (unsigned long long)rx_status
.mactime
);
1167 * It seems that the antenna field in the phy flags value
1168 * is actually a bit field. This is undefined by radiotap,
1169 * it wants an actual antenna number but I always get "7"
1170 * for most legacy frames I receive indicating that the
1171 * same frame was received on all three RX chains.
1173 * I think this field should be removed in favor of a
1174 * new 802.11n radiotap field "RX chains" that is defined
1178 (le16_to_cpu(phy_res
->phy_flags
) & RX_RES_PHY_FLAGS_ANTENNA_MSK
)
1179 >> RX_RES_PHY_FLAGS_ANTENNA_POS
;
1181 /* set the preamble flag if appropriate */
1182 if (phy_res
->phy_flags
& RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK
)
1183 rx_status
.flag
|= RX_FLAG_SHORTPRE
;
1185 /* Set up the HT phy flags */
1186 if (rate_n_flags
& RATE_MCS_HT_MSK
)
1187 rx_status
.flag
|= RX_FLAG_HT
;
1188 if (rate_n_flags
& RATE_MCS_HT40_MSK
)
1189 rx_status
.flag
|= RX_FLAG_40MHZ
;
1190 if (rate_n_flags
& RATE_MCS_SGI_MSK
)
1191 rx_status
.flag
|= RX_FLAG_SHORT_GI
;
1193 if (iwl_is_network_packet(priv
, header
)) {
1194 priv
->last_rx_rssi
= rx_status
.signal
;
1195 priv
->last_beacon_time
= priv
->ucode_beacon_time
;
1196 priv
->last_tsf
= le64_to_cpu(phy_res
->timestamp
);
1199 iwl_pass_packet_to_mac80211(priv
, header
, len
, ampdu_status
,
1202 EXPORT_SYMBOL(iwl_rx_reply_rx
);
1204 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1205 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1206 void iwl_rx_reply_rx_phy(struct iwl_priv
*priv
,
1207 struct iwl_rx_mem_buffer
*rxb
)
1209 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
1210 priv
->last_phy_res
[0] = 1;
1211 memcpy(&priv
->last_phy_res
[1], &(pkt
->u
.raw
[0]),
1212 sizeof(struct iwl_rx_phy_res
));
1214 EXPORT_SYMBOL(iwl_rx_reply_rx_phy
);