1 /******************************************************************************
3 * Copyright(c) 2003 - 2008 Intel Corporation. All rights reserved.
5 * Portions of this file are derived from the ipw3945 project, as well
6 * as portions of the ieee80211 subsystem header files.
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of version 2 of the GNU General Public License as
10 * published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
21 * The full GNU General Public License is included in this distribution in the
22 * file called LICENSE.
24 * Contact Information:
25 * 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
)
132 spin_lock_irqsave(&q
->lock
, flags
);
134 if (q
->need_update
== 0)
137 /* If power-saving is in use, make sure device is awake */
138 if (test_bit(STATUS_POWER_PMI
, &priv
->status
)) {
139 reg
= iwl_read32(priv
, CSR_UCODE_DRV_GP1
);
141 if (reg
& CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP
) {
142 iwl_set_bit(priv
, CSR_GP_CNTRL
,
143 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ
);
147 ret
= iwl_grab_nic_access(priv
);
151 /* Device expects a multiple of 8 */
152 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_WPTR
,
154 iwl_release_nic_access(priv
);
156 /* Else device is assumed to be awake */
158 /* Device expects a multiple of 8 */
159 iwl_write32(priv
, FH_RSCSR_CHNL0_WPTR
, q
->write
& ~0x7);
165 spin_unlock_irqrestore(&q
->lock
, flags
);
168 EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr
);
170 * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
172 static inline __le32
iwl_dma_addr2rbd_ptr(struct iwl_priv
*priv
,
175 return cpu_to_le32((u32
)(dma_addr
>> 8));
179 * iwl_rx_queue_restock - refill RX queue from pre-allocated pool
181 * If there are slots in the RX queue that need to be restocked,
182 * and we have free pre-allocated buffers, fill the ranks as much
183 * as we can, pulling from rx_free.
185 * This moves the 'write' index forward to catch up with 'processed', and
186 * also updates the memory address in the firmware to reference the new
189 int iwl_rx_queue_restock(struct iwl_priv
*priv
)
191 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
192 struct list_head
*element
;
193 struct iwl_rx_mem_buffer
*rxb
;
198 spin_lock_irqsave(&rxq
->lock
, flags
);
199 write
= rxq
->write
& ~0x7;
200 while ((iwl_rx_queue_space(rxq
) > 0) && (rxq
->free_count
)) {
201 /* Get next free Rx buffer, remove from free list */
202 element
= rxq
->rx_free
.next
;
203 rxb
= list_entry(element
, struct iwl_rx_mem_buffer
, list
);
206 /* Point to Rx buffer via next RBD in circular buffer */
207 rxq
->bd
[rxq
->write
] = iwl_dma_addr2rbd_ptr(priv
, rxb
->aligned_dma_addr
);
208 rxq
->queue
[rxq
->write
] = rxb
;
209 rxq
->write
= (rxq
->write
+ 1) & RX_QUEUE_MASK
;
212 spin_unlock_irqrestore(&rxq
->lock
, flags
);
213 /* If the pre-allocated buffer pool is dropping low, schedule to
215 if (rxq
->free_count
<= RX_LOW_WATERMARK
)
216 queue_work(priv
->workqueue
, &priv
->rx_replenish
);
219 /* If we've added more space for the firmware to place data, tell it.
220 * Increment device's write pointer in multiples of 8. */
221 if (write
!= (rxq
->write
& ~0x7)) {
222 spin_lock_irqsave(&rxq
->lock
, flags
);
223 rxq
->need_update
= 1;
224 spin_unlock_irqrestore(&rxq
->lock
, flags
);
225 ret
= iwl_rx_queue_update_write_ptr(priv
, rxq
);
230 EXPORT_SYMBOL(iwl_rx_queue_restock
);
234 * iwl_rx_replenish - Move all used packet from rx_used to rx_free
236 * When moving to rx_free an SKB is allocated for the slot.
238 * Also restock the Rx queue via iwl_rx_queue_restock.
239 * This is called as a scheduled work item (except for during initialization)
241 void iwl_rx_allocate(struct iwl_priv
*priv
)
243 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
244 struct list_head
*element
;
245 struct iwl_rx_mem_buffer
*rxb
;
249 spin_lock_irqsave(&rxq
->lock
, flags
);
251 if (list_empty(&rxq
->rx_used
)) {
252 spin_unlock_irqrestore(&rxq
->lock
, flags
);
255 element
= rxq
->rx_used
.next
;
256 rxb
= list_entry(element
, struct iwl_rx_mem_buffer
, list
);
259 spin_unlock_irqrestore(&rxq
->lock
, flags
);
261 /* Alloc a new receive buffer */
262 rxb
->skb
= alloc_skb(priv
->hw_params
.rx_buf_size
+ 256,
265 IWL_CRIT(priv
, "Can not allocate SKB buffers\n");
266 /* We don't reschedule replenish work here -- we will
267 * call the restock method and if it still needs
268 * more buffers it will schedule replenish */
272 /* Get physical address of RB/SKB */
273 rxb
->real_dma_addr
= pci_map_single(
276 priv
->hw_params
.rx_buf_size
+ 256,
278 /* dma address must be no more than 36 bits */
279 BUG_ON(rxb
->real_dma_addr
& ~DMA_BIT_MASK(36));
280 /* and also 256 byte aligned! */
281 rxb
->aligned_dma_addr
= ALIGN(rxb
->real_dma_addr
, 256);
282 skb_reserve(rxb
->skb
, rxb
->aligned_dma_addr
- rxb
->real_dma_addr
);
284 spin_lock_irqsave(&rxq
->lock
, flags
);
286 list_add_tail(&rxb
->list
, &rxq
->rx_free
);
288 priv
->alloc_rxb_skb
++;
290 spin_unlock_irqrestore(&rxq
->lock
, flags
);
294 void iwl_rx_replenish(struct iwl_priv
*priv
)
298 iwl_rx_allocate(priv
);
300 spin_lock_irqsave(&priv
->lock
, flags
);
301 iwl_rx_queue_restock(priv
);
302 spin_unlock_irqrestore(&priv
->lock
, flags
);
304 EXPORT_SYMBOL(iwl_rx_replenish
);
307 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
308 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
309 * This free routine walks the list of POOL entries and if SKB is set to
310 * non NULL it is unmapped and freed
312 void iwl_rx_queue_free(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
315 for (i
= 0; i
< RX_QUEUE_SIZE
+ RX_FREE_BUFFERS
; i
++) {
316 if (rxq
->pool
[i
].skb
!= NULL
) {
317 pci_unmap_single(priv
->pci_dev
,
318 rxq
->pool
[i
].real_dma_addr
,
319 priv
->hw_params
.rx_buf_size
+ 256,
321 dev_kfree_skb(rxq
->pool
[i
].skb
);
325 pci_free_consistent(priv
->pci_dev
, 4 * RX_QUEUE_SIZE
, rxq
->bd
,
327 pci_free_consistent(priv
->pci_dev
, sizeof(struct iwl_rb_status
),
328 rxq
->rb_stts
, rxq
->rb_stts_dma
);
332 EXPORT_SYMBOL(iwl_rx_queue_free
);
334 int iwl_rx_queue_alloc(struct iwl_priv
*priv
)
336 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
337 struct pci_dev
*dev
= priv
->pci_dev
;
340 spin_lock_init(&rxq
->lock
);
341 INIT_LIST_HEAD(&rxq
->rx_free
);
342 INIT_LIST_HEAD(&rxq
->rx_used
);
344 /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
345 rxq
->bd
= pci_alloc_consistent(dev
, 4 * RX_QUEUE_SIZE
, &rxq
->dma_addr
);
349 rxq
->rb_stts
= pci_alloc_consistent(dev
, sizeof(struct iwl_rb_status
),
354 /* Fill the rx_used queue with _all_ of the Rx buffers */
355 for (i
= 0; i
< RX_FREE_BUFFERS
+ RX_QUEUE_SIZE
; i
++)
356 list_add_tail(&rxq
->pool
[i
].list
, &rxq
->rx_used
);
358 /* Set us so that we have processed and used all buffers, but have
359 * not restocked the Rx queue with fresh buffers */
360 rxq
->read
= rxq
->write
= 0;
362 rxq
->need_update
= 0;
366 pci_free_consistent(priv
->pci_dev
, 4 * RX_QUEUE_SIZE
, rxq
->bd
,
371 EXPORT_SYMBOL(iwl_rx_queue_alloc
);
373 void iwl_rx_queue_reset(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
377 spin_lock_irqsave(&rxq
->lock
, flags
);
378 INIT_LIST_HEAD(&rxq
->rx_free
);
379 INIT_LIST_HEAD(&rxq
->rx_used
);
380 /* Fill the rx_used queue with _all_ of the Rx buffers */
381 for (i
= 0; i
< RX_FREE_BUFFERS
+ RX_QUEUE_SIZE
; i
++) {
382 /* In the reset function, these buffers may have been allocated
383 * to an SKB, so we need to unmap and free potential storage */
384 if (rxq
->pool
[i
].skb
!= NULL
) {
385 pci_unmap_single(priv
->pci_dev
,
386 rxq
->pool
[i
].real_dma_addr
,
387 priv
->hw_params
.rx_buf_size
+ 256,
389 priv
->alloc_rxb_skb
--;
390 dev_kfree_skb(rxq
->pool
[i
].skb
);
391 rxq
->pool
[i
].skb
= NULL
;
393 list_add_tail(&rxq
->pool
[i
].list
, &rxq
->rx_used
);
396 /* Set us so that we have processed and used all buffers, but have
397 * not restocked the Rx queue with fresh buffers */
398 rxq
->read
= rxq
->write
= 0;
400 spin_unlock_irqrestore(&rxq
->lock
, flags
);
402 EXPORT_SYMBOL(iwl_rx_queue_reset
);
404 int iwl_rx_init(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
409 const u32 rfdnlog
= RX_QUEUE_SIZE_LOG
; /* 256 RBDs */
410 const u32 rb_timeout
= 0; /* FIXME: RX_RB_TIMEOUT why this stalls RX */
412 spin_lock_irqsave(&priv
->lock
, flags
);
413 ret
= iwl_grab_nic_access(priv
);
415 spin_unlock_irqrestore(&priv
->lock
, flags
);
419 if (priv
->cfg
->mod_params
->amsdu_size_8K
)
420 rb_size
= FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K
;
422 rb_size
= FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K
;
425 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
, 0);
427 /* Reset driver's Rx queue write index */
428 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_RBDCB_WPTR_REG
, 0);
430 /* Tell device where to find RBD circular buffer in DRAM */
431 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_RBDCB_BASE_REG
,
432 (u32
)(rxq
->dma_addr
>> 8));
434 /* Tell device where in DRAM to update its Rx status */
435 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_STTS_WPTR_REG
,
436 rxq
->rb_stts_dma
>> 4);
439 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
440 * the credit mechanism in 5000 HW RX FIFO
441 * Direct rx interrupts to hosts
442 * Rx buffer size 4 or 8k
446 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
,
447 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL
|
448 FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY
|
449 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL
|
450 FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK
|
452 (rb_timeout
<< FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS
)|
453 (rfdnlog
<< FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS
));
455 iwl_release_nic_access(priv
);
457 iwl_write32(priv
, CSR_INT_COALESCING
, 0x40);
459 spin_unlock_irqrestore(&priv
->lock
, flags
);
464 int iwl_rxq_stop(struct iwl_priv
*priv
)
469 spin_lock_irqsave(&priv
->lock
, flags
);
470 ret
= iwl_grab_nic_access(priv
);
472 spin_unlock_irqrestore(&priv
->lock
, flags
);
477 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
, 0);
478 iwl_poll_direct_bit(priv
, FH_MEM_RSSR_RX_STATUS_REG
,
479 FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE
, 1000);
481 iwl_release_nic_access(priv
);
482 spin_unlock_irqrestore(&priv
->lock
, flags
);
486 EXPORT_SYMBOL(iwl_rxq_stop
);
488 void iwl_rx_missed_beacon_notif(struct iwl_priv
*priv
,
489 struct iwl_rx_mem_buffer
*rxb
)
492 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
493 struct iwl_missed_beacon_notif
*missed_beacon
;
495 missed_beacon
= &pkt
->u
.missed_beacon
;
496 if (le32_to_cpu(missed_beacon
->consequtive_missed_beacons
) > 5) {
497 IWL_DEBUG_CALIB("missed bcn cnsq %d totl %d rcd %d expctd %d\n",
498 le32_to_cpu(missed_beacon
->consequtive_missed_beacons
),
499 le32_to_cpu(missed_beacon
->total_missed_becons
),
500 le32_to_cpu(missed_beacon
->num_recvd_beacons
),
501 le32_to_cpu(missed_beacon
->num_expected_beacons
));
502 if (!test_bit(STATUS_SCANNING
, &priv
->status
))
503 iwl_init_sensitivity(priv
);
506 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif
);
509 /* Calculate noise level, based on measurements during network silence just
510 * before arriving beacon. This measurement can be done only if we know
511 * exactly when to expect beacons, therefore only when we're associated. */
512 static void iwl_rx_calc_noise(struct iwl_priv
*priv
)
514 struct statistics_rx_non_phy
*rx_info
515 = &(priv
->statistics
.rx
.general
);
516 int num_active_rx
= 0;
517 int total_silence
= 0;
519 le32_to_cpu(rx_info
->beacon_silence_rssi_a
) & IN_BAND_FILTER
;
521 le32_to_cpu(rx_info
->beacon_silence_rssi_b
) & IN_BAND_FILTER
;
523 le32_to_cpu(rx_info
->beacon_silence_rssi_c
) & IN_BAND_FILTER
;
526 total_silence
+= bcn_silence_a
;
530 total_silence
+= bcn_silence_b
;
534 total_silence
+= bcn_silence_c
;
538 /* Average among active antennas */
540 priv
->last_rx_noise
= (total_silence
/ num_active_rx
) - 107;
542 priv
->last_rx_noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
544 IWL_DEBUG_CALIB("inband silence a %u, b %u, c %u, dBm %d\n",
545 bcn_silence_a
, bcn_silence_b
, bcn_silence_c
,
546 priv
->last_rx_noise
);
549 #define REG_RECALIB_PERIOD (60)
551 void iwl_rx_statistics(struct iwl_priv
*priv
,
552 struct iwl_rx_mem_buffer
*rxb
)
555 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
557 IWL_DEBUG_RX("Statistics notification received (%d vs %d).\n",
558 (int)sizeof(priv
->statistics
), pkt
->len
);
560 change
= ((priv
->statistics
.general
.temperature
!=
561 pkt
->u
.stats
.general
.temperature
) ||
562 ((priv
->statistics
.flag
&
563 STATISTICS_REPLY_FLG_FAT_MODE_MSK
) !=
564 (pkt
->u
.stats
.flag
& STATISTICS_REPLY_FLG_FAT_MODE_MSK
)));
566 memcpy(&priv
->statistics
, &pkt
->u
.stats
, sizeof(priv
->statistics
));
568 set_bit(STATUS_STATISTICS
, &priv
->status
);
570 /* Reschedule the statistics timer to occur in
571 * REG_RECALIB_PERIOD seconds to ensure we get a
572 * thermal update even if the uCode doesn't give
574 mod_timer(&priv
->statistics_periodic
, jiffies
+
575 msecs_to_jiffies(REG_RECALIB_PERIOD
* 1000));
577 if (unlikely(!test_bit(STATUS_SCANNING
, &priv
->status
)) &&
578 (pkt
->hdr
.cmd
== STATISTICS_NOTIFICATION
)) {
579 iwl_rx_calc_noise(priv
);
580 queue_work(priv
->workqueue
, &priv
->run_time_calib_work
);
583 iwl_leds_background(priv
);
585 if (priv
->cfg
->ops
->lib
->temperature
&& change
)
586 priv
->cfg
->ops
->lib
->temperature(priv
);
588 EXPORT_SYMBOL(iwl_rx_statistics
);
590 #define PERFECT_RSSI (-20) /* dBm */
591 #define WORST_RSSI (-95) /* dBm */
592 #define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
594 /* Calculate an indication of rx signal quality (a percentage, not dBm!).
595 * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
596 * about formulas used below. */
597 static int iwl_calc_sig_qual(int rssi_dbm
, int noise_dbm
)
600 int degradation
= PERFECT_RSSI
- rssi_dbm
;
602 /* If we get a noise measurement, use signal-to-noise ratio (SNR)
603 * as indicator; formula is (signal dbm - noise dbm).
604 * SNR at or above 40 is a great signal (100%).
605 * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
606 * Weakest usable signal is usually 10 - 15 dB SNR. */
608 if (rssi_dbm
- noise_dbm
>= 40)
610 else if (rssi_dbm
< noise_dbm
)
612 sig_qual
= ((rssi_dbm
- noise_dbm
) * 5) / 2;
614 /* Else use just the signal level.
615 * This formula is a least squares fit of data points collected and
616 * compared with a reference system that had a percentage (%) display
617 * for signal quality. */
619 sig_qual
= (100 * (RSSI_RANGE
* RSSI_RANGE
) - degradation
*
620 (15 * RSSI_RANGE
+ 62 * degradation
)) /
621 (RSSI_RANGE
* RSSI_RANGE
);
625 else if (sig_qual
< 1)
631 /* Calc max signal level (dBm) among 3 possible receivers */
632 static inline int iwl_calc_rssi(struct iwl_priv
*priv
,
633 struct iwl_rx_phy_res
*rx_resp
)
635 return priv
->cfg
->ops
->utils
->calc_rssi(priv
, rx_resp
);
638 #ifdef CONFIG_IWLWIFI_DEBUG
640 * iwl_dbg_report_frame - dump frame to syslog during debug sessions
642 * You may hack this function to show different aspects of received frames,
643 * including selective frame dumps.
644 * group100 parameter selects whether to show 1 out of 100 good data frames.
645 * All beacon and probe response frames are printed.
647 static void iwl_dbg_report_frame(struct iwl_priv
*priv
,
648 struct iwl_rx_phy_res
*phy_res
, u16 length
,
649 struct ieee80211_hdr
*header
, int group100
)
652 u32 print_summary
= 0;
653 u32 print_dump
= 0; /* set to 1 to dump all frames' contents */
664 if (likely(!(priv
->debug_level
& IWL_DL_RX
)))
668 fc
= header
->frame_control
;
669 seq_ctl
= le16_to_cpu(header
->seq_ctrl
);
672 channel
= le16_to_cpu(phy_res
->channel
);
673 phy_flags
= le16_to_cpu(phy_res
->phy_flags
);
674 rate_n_flags
= le32_to_cpu(phy_res
->rate_n_flags
);
676 /* signal statistics */
677 rssi
= iwl_calc_rssi(priv
, phy_res
);
678 tsf_low
= le64_to_cpu(phy_res
->timestamp
) & 0x0ffffffff;
680 to_us
= !compare_ether_addr(header
->addr1
, priv
->mac_addr
);
682 /* if data frame is to us and all is good,
683 * (optionally) print summary for only 1 out of every 100 */
684 if (to_us
&& (fc
& ~cpu_to_le16(IEEE80211_FCTL_PROTECTED
)) ==
685 cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FTYPE_DATA
)) {
688 print_summary
= 1; /* print each frame */
689 else if (priv
->framecnt_to_us
< 100) {
690 priv
->framecnt_to_us
++;
693 priv
->framecnt_to_us
= 0;
698 /* print summary for all other frames */
709 else if (ieee80211_has_retry(fc
))
711 else if (ieee80211_is_assoc_resp(fc
))
713 else if (ieee80211_is_reassoc_resp(fc
))
715 else if (ieee80211_is_probe_resp(fc
)) {
717 print_dump
= 1; /* dump frame contents */
718 } else if (ieee80211_is_beacon(fc
)) {
720 print_dump
= 1; /* dump frame contents */
721 } else if (ieee80211_is_atim(fc
))
723 else if (ieee80211_is_auth(fc
))
725 else if (ieee80211_is_deauth(fc
))
727 else if (ieee80211_is_disassoc(fc
))
732 rate_idx
= iwl_hwrate_to_plcp_idx(rate_n_flags
);
733 if (unlikely((rate_idx
< 0) || (rate_idx
>= IWL_RATE_COUNT
))) {
737 bitrate
= iwl_rates
[rate_idx
].ieee
/ 2;
740 /* print frame summary.
741 * MAC addresses show just the last byte (for brevity),
742 * but you can hack it to show more, if you'd like to. */
744 IWL_DEBUG_RX("%s: mhd=0x%04x, dst=0x%02x, "
745 "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
746 title
, le16_to_cpu(fc
), header
->addr1
[5],
747 length
, rssi
, channel
, bitrate
);
749 /* src/dst addresses assume managed mode */
750 IWL_DEBUG_RX("%s: 0x%04x, dst=0x%02x, src=0x%02x, "
751 "len=%u, rssi=%d, tim=%lu usec, "
752 "phy=0x%02x, chnl=%d\n",
753 title
, le16_to_cpu(fc
), header
->addr1
[5],
754 header
->addr3
[5], length
, rssi
,
755 tsf_low
- priv
->scan_start_tsf
,
760 iwl_print_hex_dump(priv
, IWL_DL_RX
, header
, length
);
764 static void iwl_update_rx_stats(struct iwl_priv
*priv
, u16 fc
, u16 len
)
766 /* 0 - mgmt, 1 - cnt, 2 - data */
767 int idx
= (fc
& IEEE80211_FCTL_FTYPE
) >> 2;
768 priv
->rx_stats
[idx
].cnt
++;
769 priv
->rx_stats
[idx
].bytes
+= len
;
773 * returns non-zero if packet should be dropped
775 static int iwl_set_decrypted_flag(struct iwl_priv
*priv
,
776 struct ieee80211_hdr
*hdr
,
778 struct ieee80211_rx_status
*stats
)
780 u16 fc
= le16_to_cpu(hdr
->frame_control
);
782 if (priv
->active_rxon
.filter_flags
& RXON_FILTER_DIS_DECRYPT_MSK
)
785 if (!(fc
& IEEE80211_FCTL_PROTECTED
))
788 IWL_DEBUG_RX("decrypt_res:0x%x\n", decrypt_res
);
789 switch (decrypt_res
& RX_RES_STATUS_SEC_TYPE_MSK
) {
790 case RX_RES_STATUS_SEC_TYPE_TKIP
:
791 /* The uCode has got a bad phase 1 Key, pushes the packet.
792 * Decryption will be done in SW. */
793 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
794 RX_RES_STATUS_BAD_KEY_TTAK
)
797 case RX_RES_STATUS_SEC_TYPE_WEP
:
798 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
799 RX_RES_STATUS_BAD_ICV_MIC
) {
800 /* bad ICV, the packet is destroyed since the
801 * decryption is inplace, drop it */
802 IWL_DEBUG_RX("Packet destroyed\n");
805 case RX_RES_STATUS_SEC_TYPE_CCMP
:
806 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
807 RX_RES_STATUS_DECRYPT_OK
) {
808 IWL_DEBUG_RX("hw decrypt successfully!!!\n");
809 stats
->flag
|= RX_FLAG_DECRYPTED
;
819 static u32
iwl_translate_rx_status(struct iwl_priv
*priv
, u32 decrypt_in
)
823 if ((decrypt_in
& RX_RES_STATUS_STATION_FOUND
) ==
824 RX_RES_STATUS_STATION_FOUND
)
825 decrypt_out
|= (RX_RES_STATUS_STATION_FOUND
|
826 RX_RES_STATUS_NO_STATION_INFO_MISMATCH
);
828 decrypt_out
|= (decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
);
830 /* packet was not encrypted */
831 if ((decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) ==
832 RX_RES_STATUS_SEC_TYPE_NONE
)
835 /* packet was encrypted with unknown alg */
836 if ((decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) ==
837 RX_RES_STATUS_SEC_TYPE_ERR
)
840 /* decryption was not done in HW */
841 if ((decrypt_in
& RX_MPDU_RES_STATUS_DEC_DONE_MSK
) !=
842 RX_MPDU_RES_STATUS_DEC_DONE_MSK
)
845 switch (decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) {
847 case RX_RES_STATUS_SEC_TYPE_CCMP
:
848 /* alg is CCM: check MIC only */
849 if (!(decrypt_in
& RX_MPDU_RES_STATUS_MIC_OK
))
851 decrypt_out
|= RX_RES_STATUS_BAD_ICV_MIC
;
853 decrypt_out
|= RX_RES_STATUS_DECRYPT_OK
;
857 case RX_RES_STATUS_SEC_TYPE_TKIP
:
858 if (!(decrypt_in
& RX_MPDU_RES_STATUS_TTAK_OK
)) {
860 decrypt_out
|= RX_RES_STATUS_BAD_KEY_TTAK
;
863 /* fall through if TTAK OK */
865 if (!(decrypt_in
& RX_MPDU_RES_STATUS_ICV_OK
))
866 decrypt_out
|= RX_RES_STATUS_BAD_ICV_MIC
;
868 decrypt_out
|= RX_RES_STATUS_DECRYPT_OK
;
872 IWL_DEBUG_RX("decrypt_in:0x%x decrypt_out = 0x%x\n",
873 decrypt_in
, decrypt_out
);
878 static void iwl_pass_packet_to_mac80211(struct iwl_priv
*priv
,
880 struct iwl_rx_mem_buffer
*rxb
,
881 struct ieee80211_rx_status
*stats
)
883 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
884 struct iwl_rx_phy_res
*rx_start
= (include_phy
) ?
885 (struct iwl_rx_phy_res
*)&(pkt
->u
.raw
[0]) : NULL
;
886 struct ieee80211_hdr
*hdr
;
891 u32 ampdu_status_legacy
;
893 if (!include_phy
&& priv
->last_phy_res
[0])
894 rx_start
= (struct iwl_rx_phy_res
*)&priv
->last_phy_res
[1];
897 IWL_ERROR("MPDU frame without a PHY data\n");
901 hdr
= (struct ieee80211_hdr
*)((u8
*) &rx_start
[1] +
902 rx_start
->cfg_phy_cnt
);
904 len
= le16_to_cpu(rx_start
->byte_count
);
906 rx_end
= (__le32
*)((u8
*) &pkt
->u
.raw
[0] +
907 sizeof(struct iwl_rx_phy_res
) +
908 rx_start
->cfg_phy_cnt
+ len
);
911 struct iwl4965_rx_mpdu_res_start
*amsdu
=
912 (struct iwl4965_rx_mpdu_res_start
*)pkt
->u
.raw
;
914 hdr
= (struct ieee80211_hdr
*)(pkt
->u
.raw
+
915 sizeof(struct iwl4965_rx_mpdu_res_start
));
916 len
= le16_to_cpu(amsdu
->byte_count
);
917 rx_start
->byte_count
= amsdu
->byte_count
;
918 rx_end
= (__le32
*) (((u8
*) hdr
) + len
);
921 ampdu_status
= le32_to_cpu(*rx_end
);
922 skblen
= ((u8
*) rx_end
- (u8
*) &pkt
->u
.raw
[0]) + sizeof(u32
);
925 /* New status scheme, need to translate */
926 ampdu_status_legacy
= ampdu_status
;
927 ampdu_status
= iwl_translate_rx_status(priv
, ampdu_status
);
931 skb_reserve(rxb
->skb
, (void *)hdr
- (void *)pkt
);
932 skb_put(rxb
->skb
, len
); /* end where data ends */
934 /* We only process data packets if the interface is open */
935 if (unlikely(!priv
->is_open
)) {
937 ("Dropping packet while interface is not open.\n");
941 hdr
= (struct ieee80211_hdr
*)rxb
->skb
->data
;
943 /* in case of HW accelerated crypto and bad decryption, drop */
944 if (!priv
->hw_params
.sw_crypto
&&
945 iwl_set_decrypted_flag(priv
, hdr
, ampdu_status
, stats
))
948 iwl_update_rx_stats(priv
, le16_to_cpu(hdr
->frame_control
), len
);
949 ieee80211_rx_irqsafe(priv
->hw
, rxb
->skb
, stats
);
950 priv
->alloc_rxb_skb
--;
954 /* This is necessary only for a number of statistics, see the caller. */
955 static int iwl_is_network_packet(struct iwl_priv
*priv
,
956 struct ieee80211_hdr
*header
)
958 /* Filter incoming packets to determine if they are targeted toward
959 * this network, discarding packets coming from ourselves */
960 switch (priv
->iw_mode
) {
961 case NL80211_IFTYPE_ADHOC
: /* Header: Dest. | Source | BSSID */
962 /* packets to our IBSS update information */
963 return !compare_ether_addr(header
->addr3
, priv
->bssid
);
964 case NL80211_IFTYPE_STATION
: /* Header: Dest. | AP{BSSID} | Source */
965 /* packets to our IBSS update information */
966 return !compare_ether_addr(header
->addr2
, priv
->bssid
);
972 /* Called for REPLY_RX (legacy ABG frames), or
973 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
974 void iwl_rx_reply_rx(struct iwl_priv
*priv
,
975 struct iwl_rx_mem_buffer
*rxb
)
977 struct ieee80211_hdr
*header
;
978 struct ieee80211_rx_status rx_status
;
979 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
980 /* Use phy data (Rx signal strength, etc.) contained within
981 * this rx packet for legacy frames,
982 * or phy data cached from REPLY_RX_PHY_CMD for HT frames. */
983 int include_phy
= (pkt
->hdr
.cmd
== REPLY_RX
);
984 struct iwl_rx_phy_res
*rx_start
= (include_phy
) ?
985 (struct iwl_rx_phy_res
*)&(pkt
->u
.raw
[0]) :
986 (struct iwl_rx_phy_res
*)&priv
->last_phy_res
[1];
988 unsigned int len
= 0;
992 rx_status
.mactime
= le64_to_cpu(rx_start
->timestamp
);
994 ieee80211_channel_to_frequency(le16_to_cpu(rx_start
->channel
));
995 rx_status
.band
= (rx_start
->phy_flags
& RX_RES_PHY_FLAGS_BAND_24_MSK
) ?
996 IEEE80211_BAND_2GHZ
: IEEE80211_BAND_5GHZ
;
998 iwl_hwrate_to_plcp_idx(le32_to_cpu(rx_start
->rate_n_flags
));
999 if (rx_status
.band
== IEEE80211_BAND_5GHZ
)
1000 rx_status
.rate_idx
-= IWL_FIRST_OFDM_RATE
;
1004 /* TSF isn't reliable. In order to allow smooth user experience,
1005 * this W/A doesn't propagate it to the mac80211 */
1006 /*rx_status.flag |= RX_FLAG_TSFT;*/
1008 if ((unlikely(rx_start
->cfg_phy_cnt
> 20))) {
1009 IWL_DEBUG_DROP("dsp size out of range [0,20]: %d/n",
1010 rx_start
->cfg_phy_cnt
);
1015 if (priv
->last_phy_res
[0])
1016 rx_start
= (struct iwl_rx_phy_res
*)
1017 &priv
->last_phy_res
[1];
1023 IWL_ERROR("MPDU frame without a PHY data\n");
1028 header
= (struct ieee80211_hdr
*)((u8
*) &rx_start
[1]
1029 + rx_start
->cfg_phy_cnt
);
1031 len
= le16_to_cpu(rx_start
->byte_count
);
1032 rx_end
= (__le32
*)(pkt
->u
.raw
+ rx_start
->cfg_phy_cnt
+
1033 sizeof(struct iwl_rx_phy_res
) + len
);
1035 struct iwl4965_rx_mpdu_res_start
*amsdu
=
1036 (struct iwl4965_rx_mpdu_res_start
*)pkt
->u
.raw
;
1038 header
= (void *)(pkt
->u
.raw
+
1039 sizeof(struct iwl4965_rx_mpdu_res_start
));
1040 len
= le16_to_cpu(amsdu
->byte_count
);
1041 rx_end
= (__le32
*) (pkt
->u
.raw
+
1042 sizeof(struct iwl4965_rx_mpdu_res_start
) + len
);
1045 if (!(*rx_end
& RX_RES_STATUS_NO_CRC32_ERROR
) ||
1046 !(*rx_end
& RX_RES_STATUS_NO_RXE_OVERFLOW
)) {
1047 IWL_DEBUG_RX("Bad CRC or FIFO: 0x%08X.\n",
1048 le32_to_cpu(*rx_end
));
1052 priv
->ucode_beacon_time
= le32_to_cpu(rx_start
->beacon_time_stamp
);
1054 /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1055 rx_status
.signal
= iwl_calc_rssi(priv
, rx_start
);
1057 /* Meaningful noise values are available only from beacon statistics,
1058 * which are gathered only when associated, and indicate noise
1059 * only for the associated network channel ...
1060 * Ignore these noise values while scanning (other channels) */
1061 if (iwl_is_associated(priv
) &&
1062 !test_bit(STATUS_SCANNING
, &priv
->status
)) {
1063 rx_status
.noise
= priv
->last_rx_noise
;
1064 rx_status
.qual
= iwl_calc_sig_qual(rx_status
.signal
,
1067 rx_status
.noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
1068 rx_status
.qual
= iwl_calc_sig_qual(rx_status
.signal
, 0);
1071 /* Reset beacon noise level if not associated. */
1072 if (!iwl_is_associated(priv
))
1073 priv
->last_rx_noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
1075 /* Set "1" to report good data frames in groups of 100 */
1076 #ifdef CONFIG_IWLWIFI_DEBUG
1077 if (unlikely(priv
->debug_level
& IWL_DL_RX
))
1078 iwl_dbg_report_frame(priv
, rx_start
, len
, header
, 1);
1080 IWL_DEBUG_STATS_LIMIT("Rssi %d, noise %d, qual %d, TSF %llu\n",
1081 rx_status
.signal
, rx_status
.noise
, rx_status
.signal
,
1082 (unsigned long long)rx_status
.mactime
);
1087 * It seems that the antenna field in the phy flags value
1088 * is actually a bit field. This is undefined by radiotap,
1089 * it wants an actual antenna number but I always get "7"
1090 * for most legacy frames I receive indicating that the
1091 * same frame was received on all three RX chains.
1093 * I think this field should be removed in favor of a
1094 * new 802.11n radiotap field "RX chains" that is defined
1097 rx_status
.antenna
= le16_to_cpu(rx_start
->phy_flags
&
1098 RX_RES_PHY_FLAGS_ANTENNA_MSK
) >> 4;
1100 /* set the preamble flag if appropriate */
1101 if (rx_start
->phy_flags
& RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK
)
1102 rx_status
.flag
|= RX_FLAG_SHORTPRE
;
1104 /* Take shortcut when only in monitor mode */
1105 if (priv
->iw_mode
== NL80211_IFTYPE_MONITOR
) {
1106 iwl_pass_packet_to_mac80211(priv
, include_phy
,
1111 network_packet
= iwl_is_network_packet(priv
, header
);
1112 if (network_packet
) {
1113 priv
->last_rx_rssi
= rx_status
.signal
;
1114 priv
->last_beacon_time
= priv
->ucode_beacon_time
;
1115 priv
->last_tsf
= le64_to_cpu(rx_start
->timestamp
);
1118 fc
= le16_to_cpu(header
->frame_control
);
1119 switch (fc
& IEEE80211_FCTL_FTYPE
) {
1120 case IEEE80211_FTYPE_MGMT
:
1121 case IEEE80211_FTYPE_DATA
:
1122 if (priv
->iw_mode
== NL80211_IFTYPE_AP
)
1123 iwl_update_ps_mode(priv
, fc
& IEEE80211_FCTL_PM
,
1127 iwl_pass_packet_to_mac80211(priv
, include_phy
, rxb
,
1133 EXPORT_SYMBOL(iwl_rx_reply_rx
);
1135 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1136 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1137 void iwl_rx_reply_rx_phy(struct iwl_priv
*priv
,
1138 struct iwl_rx_mem_buffer
*rxb
)
1140 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
1141 priv
->last_phy_res
[0] = 1;
1142 memcpy(&priv
->last_phy_res
[1], &(pkt
->u
.raw
[0]),
1143 sizeof(struct iwl_rx_phy_res
));
1145 EXPORT_SYMBOL(iwl_rx_reply_rx_phy
);