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 * James P. Ketrenos <ipw2100-admin@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 || (abs(rxq
->write
- rxq
->read
) > 7)) {
223 spin_lock_irqsave(&rxq
->lock
, flags
);
224 rxq
->need_update
= 1;
225 spin_unlock_irqrestore(&rxq
->lock
, flags
);
226 ret
= iwl_rx_queue_update_write_ptr(priv
, rxq
);
231 EXPORT_SYMBOL(iwl_rx_queue_restock
);
235 * iwl_rx_replenish - Move all used packet from rx_used to rx_free
237 * When moving to rx_free an SKB is allocated for the slot.
239 * Also restock the Rx queue via iwl_rx_queue_restock.
240 * This is called as a scheduled work item (except for during initialization)
242 void iwl_rx_allocate(struct iwl_priv
*priv
)
244 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
245 struct list_head
*element
;
246 struct iwl_rx_mem_buffer
*rxb
;
248 spin_lock_irqsave(&rxq
->lock
, flags
);
249 while (!list_empty(&rxq
->rx_used
)) {
250 element
= rxq
->rx_used
.next
;
251 rxb
= list_entry(element
, struct iwl_rx_mem_buffer
, list
);
253 /* Alloc a new receive buffer */
254 rxb
->skb
= alloc_skb(priv
->hw_params
.rx_buf_size
+ 256,
255 __GFP_NOWARN
| GFP_ATOMIC
);
258 printk(KERN_CRIT DRV_NAME
259 ": Can not allocate SKB buffers\n");
260 /* We don't reschedule replenish work here -- we will
261 * call the restock method and if it still needs
262 * more buffers it will schedule replenish */
265 priv
->alloc_rxb_skb
++;
268 /* Get physical address of RB/SKB */
269 rxb
->real_dma_addr
= pci_map_single(
272 priv
->hw_params
.rx_buf_size
+ 256,
274 /* dma address must be no more than 36 bits */
275 BUG_ON(rxb
->real_dma_addr
& ~DMA_BIT_MASK(36));
276 /* and also 256 byte aligned! */
277 rxb
->aligned_dma_addr
= ALIGN(rxb
->real_dma_addr
, 256);
278 skb_reserve(rxb
->skb
, rxb
->aligned_dma_addr
- rxb
->real_dma_addr
);
280 list_add_tail(&rxb
->list
, &rxq
->rx_free
);
283 spin_unlock_irqrestore(&rxq
->lock
, flags
);
285 EXPORT_SYMBOL(iwl_rx_allocate
);
287 void iwl_rx_replenish(struct iwl_priv
*priv
)
291 iwl_rx_allocate(priv
);
293 spin_lock_irqsave(&priv
->lock
, flags
);
294 iwl_rx_queue_restock(priv
);
295 spin_unlock_irqrestore(&priv
->lock
, flags
);
297 EXPORT_SYMBOL(iwl_rx_replenish
);
300 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
301 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
302 * This free routine walks the list of POOL entries and if SKB is set to
303 * non NULL it is unmapped and freed
305 void iwl_rx_queue_free(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
308 for (i
= 0; i
< RX_QUEUE_SIZE
+ RX_FREE_BUFFERS
; i
++) {
309 if (rxq
->pool
[i
].skb
!= NULL
) {
310 pci_unmap_single(priv
->pci_dev
,
311 rxq
->pool
[i
].real_dma_addr
,
312 priv
->hw_params
.rx_buf_size
+ 256,
314 dev_kfree_skb(rxq
->pool
[i
].skb
);
318 pci_free_consistent(priv
->pci_dev
, 4 * RX_QUEUE_SIZE
, rxq
->bd
,
322 EXPORT_SYMBOL(iwl_rx_queue_free
);
324 int iwl_rx_queue_alloc(struct iwl_priv
*priv
)
326 struct iwl_rx_queue
*rxq
= &priv
->rxq
;
327 struct pci_dev
*dev
= priv
->pci_dev
;
330 spin_lock_init(&rxq
->lock
);
331 INIT_LIST_HEAD(&rxq
->rx_free
);
332 INIT_LIST_HEAD(&rxq
->rx_used
);
334 /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
335 rxq
->bd
= pci_alloc_consistent(dev
, 4 * RX_QUEUE_SIZE
, &rxq
->dma_addr
);
339 /* Fill the rx_used queue with _all_ of the Rx buffers */
340 for (i
= 0; i
< RX_FREE_BUFFERS
+ RX_QUEUE_SIZE
; i
++)
341 list_add_tail(&rxq
->pool
[i
].list
, &rxq
->rx_used
);
343 /* Set us so that we have processed and used all buffers, but have
344 * not restocked the Rx queue with fresh buffers */
345 rxq
->read
= rxq
->write
= 0;
347 rxq
->need_update
= 0;
350 EXPORT_SYMBOL(iwl_rx_queue_alloc
);
352 void iwl_rx_queue_reset(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
356 spin_lock_irqsave(&rxq
->lock
, flags
);
357 INIT_LIST_HEAD(&rxq
->rx_free
);
358 INIT_LIST_HEAD(&rxq
->rx_used
);
359 /* Fill the rx_used queue with _all_ of the Rx buffers */
360 for (i
= 0; i
< RX_FREE_BUFFERS
+ RX_QUEUE_SIZE
; i
++) {
361 /* In the reset function, these buffers may have been allocated
362 * to an SKB, so we need to unmap and free potential storage */
363 if (rxq
->pool
[i
].skb
!= NULL
) {
364 pci_unmap_single(priv
->pci_dev
,
365 rxq
->pool
[i
].real_dma_addr
,
366 priv
->hw_params
.rx_buf_size
+ 256,
368 priv
->alloc_rxb_skb
--;
369 dev_kfree_skb(rxq
->pool
[i
].skb
);
370 rxq
->pool
[i
].skb
= NULL
;
372 list_add_tail(&rxq
->pool
[i
].list
, &rxq
->rx_used
);
375 /* Set us so that we have processed and used all buffers, but have
376 * not restocked the Rx queue with fresh buffers */
377 rxq
->read
= rxq
->write
= 0;
379 spin_unlock_irqrestore(&rxq
->lock
, flags
);
381 EXPORT_SYMBOL(iwl_rx_queue_reset
);
383 int iwl_rx_init(struct iwl_priv
*priv
, struct iwl_rx_queue
*rxq
)
388 const u32 rfdnlog
= RX_QUEUE_SIZE_LOG
; /* 256 RBDs */
389 const u32 rb_timeout
= 0; /* FIXME: RX_RB_TIMEOUT why this stalls RX */
391 spin_lock_irqsave(&priv
->lock
, flags
);
392 ret
= iwl_grab_nic_access(priv
);
394 spin_unlock_irqrestore(&priv
->lock
, flags
);
398 if (priv
->cfg
->mod_params
->amsdu_size_8K
)
399 rb_size
= FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K
;
401 rb_size
= FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K
;
404 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
, 0);
406 /* Reset driver's Rx queue write index */
407 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_RBDCB_WPTR_REG
, 0);
409 /* Tell device where to find RBD circular buffer in DRAM */
410 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_RBDCB_BASE_REG
,
411 (u32
)(rxq
->dma_addr
>> 8));
413 /* Tell device where in DRAM to update its Rx status */
414 iwl_write_direct32(priv
, FH_RSCSR_CHNL0_STTS_WPTR_REG
,
415 (priv
->shared_phys
+ priv
->rb_closed_offset
) >> 4);
418 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set becuase of HW bug in
419 * the credit mechanism in 5000 HW RX FIFO
420 * Direct rx interrupts to hosts
421 * Rx buffer size 4 or 8k
425 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
,
426 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL
|
427 FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY
|
428 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL
|
430 (rb_timeout
<< FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS
)|
431 (rfdnlog
<< FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS
));
433 iwl_release_nic_access(priv
);
435 iwl_write32(priv
, CSR_INT_COALESCING
, 0x40);
437 spin_unlock_irqrestore(&priv
->lock
, flags
);
442 int iwl_rxq_stop(struct iwl_priv
*priv
)
447 spin_lock_irqsave(&priv
->lock
, flags
);
448 ret
= iwl_grab_nic_access(priv
);
450 spin_unlock_irqrestore(&priv
->lock
, flags
);
455 iwl_write_direct32(priv
, FH_MEM_RCSR_CHNL0_CONFIG_REG
, 0);
456 ret
= iwl_poll_direct_bit(priv
, FH_MEM_RSSR_RX_STATUS_REG
,
459 IWL_ERROR("Can't stop Rx DMA.\n");
461 iwl_release_nic_access(priv
);
462 spin_unlock_irqrestore(&priv
->lock
, flags
);
466 EXPORT_SYMBOL(iwl_rxq_stop
);
468 void iwl_rx_missed_beacon_notif(struct iwl_priv
*priv
,
469 struct iwl_rx_mem_buffer
*rxb
)
472 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
473 struct iwl4965_missed_beacon_notif
*missed_beacon
;
475 missed_beacon
= &pkt
->u
.missed_beacon
;
476 if (le32_to_cpu(missed_beacon
->consequtive_missed_beacons
) > 5) {
477 IWL_DEBUG_CALIB("missed bcn cnsq %d totl %d rcd %d expctd %d\n",
478 le32_to_cpu(missed_beacon
->consequtive_missed_beacons
),
479 le32_to_cpu(missed_beacon
->total_missed_becons
),
480 le32_to_cpu(missed_beacon
->num_recvd_beacons
),
481 le32_to_cpu(missed_beacon
->num_expected_beacons
));
482 if (!test_bit(STATUS_SCANNING
, &priv
->status
))
483 iwl_init_sensitivity(priv
);
486 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif
);
488 int iwl_rx_agg_start(struct iwl_priv
*priv
, const u8
*addr
, int tid
, u16 ssn
)
493 sta_id
= iwl_find_station(priv
, addr
);
494 if (sta_id
== IWL_INVALID_STATION
)
497 spin_lock_irqsave(&priv
->sta_lock
, flags
);
498 priv
->stations
[sta_id
].sta
.station_flags_msk
= 0;
499 priv
->stations
[sta_id
].sta
.sta
.modify_mask
= STA_MODIFY_ADDBA_TID_MSK
;
500 priv
->stations
[sta_id
].sta
.add_immediate_ba_tid
= (u8
)tid
;
501 priv
->stations
[sta_id
].sta
.add_immediate_ba_ssn
= cpu_to_le16(ssn
);
502 priv
->stations
[sta_id
].sta
.mode
= STA_CONTROL_MODIFY_MSK
;
503 spin_unlock_irqrestore(&priv
->sta_lock
, flags
);
505 return iwl_send_add_sta(priv
, &priv
->stations
[sta_id
].sta
,
508 EXPORT_SYMBOL(iwl_rx_agg_start
);
510 int iwl_rx_agg_stop(struct iwl_priv
*priv
, const u8
*addr
, int tid
)
515 sta_id
= iwl_find_station(priv
, addr
);
516 if (sta_id
== IWL_INVALID_STATION
)
519 spin_lock_irqsave(&priv
->sta_lock
, flags
);
520 priv
->stations
[sta_id
].sta
.station_flags_msk
= 0;
521 priv
->stations
[sta_id
].sta
.sta
.modify_mask
= STA_MODIFY_DELBA_TID_MSK
;
522 priv
->stations
[sta_id
].sta
.remove_immediate_ba_tid
= (u8
)tid
;
523 priv
->stations
[sta_id
].sta
.mode
= STA_CONTROL_MODIFY_MSK
;
524 spin_unlock_irqrestore(&priv
->sta_lock
, flags
);
526 return iwl_send_add_sta(priv
, &priv
->stations
[sta_id
].sta
,
529 EXPORT_SYMBOL(iwl_rx_agg_stop
);
532 /* Calculate noise level, based on measurements during network silence just
533 * before arriving beacon. This measurement can be done only if we know
534 * exactly when to expect beacons, therefore only when we're associated. */
535 static void iwl_rx_calc_noise(struct iwl_priv
*priv
)
537 struct statistics_rx_non_phy
*rx_info
538 = &(priv
->statistics
.rx
.general
);
539 int num_active_rx
= 0;
540 int total_silence
= 0;
542 le32_to_cpu(rx_info
->beacon_silence_rssi_a
) & IN_BAND_FILTER
;
544 le32_to_cpu(rx_info
->beacon_silence_rssi_b
) & IN_BAND_FILTER
;
546 le32_to_cpu(rx_info
->beacon_silence_rssi_c
) & IN_BAND_FILTER
;
549 total_silence
+= bcn_silence_a
;
553 total_silence
+= bcn_silence_b
;
557 total_silence
+= bcn_silence_c
;
561 /* Average among active antennas */
563 priv
->last_rx_noise
= (total_silence
/ num_active_rx
) - 107;
565 priv
->last_rx_noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
567 IWL_DEBUG_CALIB("inband silence a %u, b %u, c %u, dBm %d\n",
568 bcn_silence_a
, bcn_silence_b
, bcn_silence_c
,
569 priv
->last_rx_noise
);
572 #define REG_RECALIB_PERIOD (60)
574 void iwl_rx_statistics(struct iwl_priv
*priv
,
575 struct iwl_rx_mem_buffer
*rxb
)
578 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
580 IWL_DEBUG_RX("Statistics notification received (%d vs %d).\n",
581 (int)sizeof(priv
->statistics
), pkt
->len
);
583 change
= ((priv
->statistics
.general
.temperature
!=
584 pkt
->u
.stats
.general
.temperature
) ||
585 ((priv
->statistics
.flag
&
586 STATISTICS_REPLY_FLG_FAT_MODE_MSK
) !=
587 (pkt
->u
.stats
.flag
& STATISTICS_REPLY_FLG_FAT_MODE_MSK
)));
589 memcpy(&priv
->statistics
, &pkt
->u
.stats
, sizeof(priv
->statistics
));
591 set_bit(STATUS_STATISTICS
, &priv
->status
);
593 /* Reschedule the statistics timer to occur in
594 * REG_RECALIB_PERIOD seconds to ensure we get a
595 * thermal update even if the uCode doesn't give
597 mod_timer(&priv
->statistics_periodic
, jiffies
+
598 msecs_to_jiffies(REG_RECALIB_PERIOD
* 1000));
600 if (unlikely(!test_bit(STATUS_SCANNING
, &priv
->status
)) &&
601 (pkt
->hdr
.cmd
== STATISTICS_NOTIFICATION
)) {
602 iwl_rx_calc_noise(priv
);
603 queue_work(priv
->workqueue
, &priv
->run_time_calib_work
);
606 iwl_leds_background(priv
);
608 if (priv
->cfg
->ops
->lib
->temperature
&& change
)
609 priv
->cfg
->ops
->lib
->temperature(priv
);
611 EXPORT_SYMBOL(iwl_rx_statistics
);
613 #define PERFECT_RSSI (-20) /* dBm */
614 #define WORST_RSSI (-95) /* dBm */
615 #define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
617 /* Calculate an indication of rx signal quality (a percentage, not dBm!).
618 * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
619 * about formulas used below. */
620 static int iwl_calc_sig_qual(int rssi_dbm
, int noise_dbm
)
623 int degradation
= PERFECT_RSSI
- rssi_dbm
;
625 /* If we get a noise measurement, use signal-to-noise ratio (SNR)
626 * as indicator; formula is (signal dbm - noise dbm).
627 * SNR at or above 40 is a great signal (100%).
628 * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
629 * Weakest usable signal is usually 10 - 15 dB SNR. */
631 if (rssi_dbm
- noise_dbm
>= 40)
633 else if (rssi_dbm
< noise_dbm
)
635 sig_qual
= ((rssi_dbm
- noise_dbm
) * 5) / 2;
637 /* Else use just the signal level.
638 * This formula is a least squares fit of data points collected and
639 * compared with a reference system that had a percentage (%) display
640 * for signal quality. */
642 sig_qual
= (100 * (RSSI_RANGE
* RSSI_RANGE
) - degradation
*
643 (15 * RSSI_RANGE
+ 62 * degradation
)) /
644 (RSSI_RANGE
* RSSI_RANGE
);
648 else if (sig_qual
< 1)
654 #ifdef CONFIG_IWLWIFI_DEBUG
657 * iwl_dbg_report_frame - dump frame to syslog during debug sessions
659 * You may hack this function to show different aspects of received frames,
660 * including selective frame dumps.
661 * group100 parameter selects whether to show 1 out of 100 good frames.
663 * TODO: This was originally written for 3945, need to audit for
664 * proper operation with 4965.
666 static void iwl_dbg_report_frame(struct iwl_priv
*priv
,
667 struct iwl_rx_packet
*pkt
,
668 struct ieee80211_hdr
*header
, int group100
)
671 u32 print_summary
= 0;
672 u32 print_dump
= 0; /* set to 1 to dump all frames' contents */
689 struct iwl4965_rx_frame_stats
*rx_stats
= IWL_RX_STATS(pkt
);
690 struct iwl4965_rx_frame_hdr
*rx_hdr
= IWL_RX_HDR(pkt
);
691 struct iwl4965_rx_frame_end
*rx_end
= IWL_RX_END(pkt
);
692 u8
*data
= IWL_RX_DATA(pkt
);
694 if (likely(!(priv
->debug_level
& IWL_DL_RX
)))
698 fc
= header
->frame_control
;
699 seq_ctl
= le16_to_cpu(header
->seq_ctrl
);
702 channel
= le16_to_cpu(rx_hdr
->channel
);
703 phy_flags
= le16_to_cpu(rx_hdr
->phy_flags
);
704 rate_sym
= rx_hdr
->rate
;
705 length
= le16_to_cpu(rx_hdr
->len
);
707 /* end-of-frame status and timestamp */
708 status
= le32_to_cpu(rx_end
->status
);
709 bcn_tmr
= le32_to_cpu(rx_end
->beacon_timestamp
);
710 tsf_low
= le64_to_cpu(rx_end
->timestamp
) & 0x0ffffffff;
711 tsf
= le64_to_cpu(rx_end
->timestamp
);
713 /* signal statistics */
714 rssi
= rx_stats
->rssi
;
716 sig_avg
= le16_to_cpu(rx_stats
->sig_avg
);
717 noise_diff
= le16_to_cpu(rx_stats
->noise_diff
);
719 to_us
= !compare_ether_addr(header
->addr1
, priv
->mac_addr
);
721 /* if data frame is to us and all is good,
722 * (optionally) print summary for only 1 out of every 100 */
723 if (to_us
&& (fc
& ~cpu_to_le16(IEEE80211_FCTL_PROTECTED
)) ==
724 cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FTYPE_DATA
)) {
727 print_summary
= 1; /* print each frame */
728 else if (priv
->framecnt_to_us
< 100) {
729 priv
->framecnt_to_us
++;
732 priv
->framecnt_to_us
= 0;
737 /* print summary for all other frames */
748 else if (ieee80211_has_retry(fc
))
750 else if (ieee80211_is_assoc_resp(fc
))
752 else if (ieee80211_is_reassoc_resp(fc
))
754 else if (ieee80211_is_probe_resp(fc
)) {
756 print_dump
= 1; /* dump frame contents */
757 } else if (ieee80211_is_beacon(fc
)) {
759 print_dump
= 1; /* dump frame contents */
760 } else if (ieee80211_is_atim(fc
))
762 else if (ieee80211_is_auth(fc
))
764 else if (ieee80211_is_deauth(fc
))
766 else if (ieee80211_is_disassoc(fc
))
771 rate_idx
= iwl_hwrate_to_plcp_idx(rate_sym
);
772 if (unlikely(rate_idx
== -1))
775 bitrate
= iwl_rates
[rate_idx
].ieee
/ 2;
777 /* print frame summary.
778 * MAC addresses show just the last byte (for brevity),
779 * but you can hack it to show more, if you'd like to. */
781 IWL_DEBUG_RX("%s: mhd=0x%04x, dst=0x%02x, "
782 "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
783 title
, le16_to_cpu(fc
), header
->addr1
[5],
784 length
, rssi
, channel
, bitrate
);
786 /* src/dst addresses assume managed mode */
787 IWL_DEBUG_RX("%s: 0x%04x, dst=0x%02x, "
788 "src=0x%02x, rssi=%u, tim=%lu usec, "
789 "phy=0x%02x, chnl=%d\n",
790 title
, le16_to_cpu(fc
), header
->addr1
[5],
791 header
->addr3
[5], rssi
,
792 tsf_low
- priv
->scan_start_tsf
,
797 iwl_print_hex_dump(priv
, IWL_DL_RX
, data
, length
);
800 static inline void iwl_dbg_report_frame(struct iwl_priv
*priv
,
801 struct iwl_rx_packet
*pkt
,
802 struct ieee80211_hdr
*header
,
808 static void iwl_update_rx_stats(struct iwl_priv
*priv
, u16 fc
, u16 len
)
810 /* 0 - mgmt, 1 - cnt, 2 - data */
811 int idx
= (fc
& IEEE80211_FCTL_FTYPE
) >> 2;
812 priv
->rx_stats
[idx
].cnt
++;
813 priv
->rx_stats
[idx
].bytes
+= len
;
817 * returns non-zero if packet should be dropped
819 static int iwl_set_decrypted_flag(struct iwl_priv
*priv
,
820 struct ieee80211_hdr
*hdr
,
822 struct ieee80211_rx_status
*stats
)
824 u16 fc
= le16_to_cpu(hdr
->frame_control
);
826 if (priv
->active_rxon
.filter_flags
& RXON_FILTER_DIS_DECRYPT_MSK
)
829 if (!(fc
& IEEE80211_FCTL_PROTECTED
))
832 IWL_DEBUG_RX("decrypt_res:0x%x\n", decrypt_res
);
833 switch (decrypt_res
& RX_RES_STATUS_SEC_TYPE_MSK
) {
834 case RX_RES_STATUS_SEC_TYPE_TKIP
:
835 /* The uCode has got a bad phase 1 Key, pushes the packet.
836 * Decryption will be done in SW. */
837 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
838 RX_RES_STATUS_BAD_KEY_TTAK
)
841 case RX_RES_STATUS_SEC_TYPE_WEP
:
842 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
843 RX_RES_STATUS_BAD_ICV_MIC
) {
844 /* bad ICV, the packet is destroyed since the
845 * decryption is inplace, drop it */
846 IWL_DEBUG_RX("Packet destroyed\n");
849 case RX_RES_STATUS_SEC_TYPE_CCMP
:
850 if ((decrypt_res
& RX_RES_STATUS_DECRYPT_TYPE_MSK
) ==
851 RX_RES_STATUS_DECRYPT_OK
) {
852 IWL_DEBUG_RX("hw decrypt successfully!!!\n");
853 stats
->flag
|= RX_FLAG_DECRYPTED
;
863 static u32
iwl_translate_rx_status(struct iwl_priv
*priv
, u32 decrypt_in
)
867 if ((decrypt_in
& RX_RES_STATUS_STATION_FOUND
) ==
868 RX_RES_STATUS_STATION_FOUND
)
869 decrypt_out
|= (RX_RES_STATUS_STATION_FOUND
|
870 RX_RES_STATUS_NO_STATION_INFO_MISMATCH
);
872 decrypt_out
|= (decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
);
874 /* packet was not encrypted */
875 if ((decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) ==
876 RX_RES_STATUS_SEC_TYPE_NONE
)
879 /* packet was encrypted with unknown alg */
880 if ((decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) ==
881 RX_RES_STATUS_SEC_TYPE_ERR
)
884 /* decryption was not done in HW */
885 if ((decrypt_in
& RX_MPDU_RES_STATUS_DEC_DONE_MSK
) !=
886 RX_MPDU_RES_STATUS_DEC_DONE_MSK
)
889 switch (decrypt_in
& RX_RES_STATUS_SEC_TYPE_MSK
) {
891 case RX_RES_STATUS_SEC_TYPE_CCMP
:
892 /* alg is CCM: check MIC only */
893 if (!(decrypt_in
& RX_MPDU_RES_STATUS_MIC_OK
))
895 decrypt_out
|= RX_RES_STATUS_BAD_ICV_MIC
;
897 decrypt_out
|= RX_RES_STATUS_DECRYPT_OK
;
901 case RX_RES_STATUS_SEC_TYPE_TKIP
:
902 if (!(decrypt_in
& RX_MPDU_RES_STATUS_TTAK_OK
)) {
904 decrypt_out
|= RX_RES_STATUS_BAD_KEY_TTAK
;
907 /* fall through if TTAK OK */
909 if (!(decrypt_in
& RX_MPDU_RES_STATUS_ICV_OK
))
910 decrypt_out
|= RX_RES_STATUS_BAD_ICV_MIC
;
912 decrypt_out
|= RX_RES_STATUS_DECRYPT_OK
;
916 IWL_DEBUG_RX("decrypt_in:0x%x decrypt_out = 0x%x\n",
917 decrypt_in
, decrypt_out
);
922 static void iwl_pass_packet_to_mac80211(struct iwl_priv
*priv
,
924 struct iwl_rx_mem_buffer
*rxb
,
925 struct ieee80211_rx_status
*stats
)
927 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
928 struct iwl_rx_phy_res
*rx_start
= (include_phy
) ?
929 (struct iwl_rx_phy_res
*)&(pkt
->u
.raw
[0]) : NULL
;
930 struct ieee80211_hdr
*hdr
;
935 u32 ampdu_status_legacy
;
937 if (!include_phy
&& priv
->last_phy_res
[0])
938 rx_start
= (struct iwl_rx_phy_res
*)&priv
->last_phy_res
[1];
941 IWL_ERROR("MPDU frame without a PHY data\n");
945 hdr
= (struct ieee80211_hdr
*)((u8
*) &rx_start
[1] +
946 rx_start
->cfg_phy_cnt
);
948 len
= le16_to_cpu(rx_start
->byte_count
);
950 rx_end
= (__le32
*)((u8
*) &pkt
->u
.raw
[0] +
951 sizeof(struct iwl_rx_phy_res
) +
952 rx_start
->cfg_phy_cnt
+ len
);
955 struct iwl4965_rx_mpdu_res_start
*amsdu
=
956 (struct iwl4965_rx_mpdu_res_start
*)pkt
->u
.raw
;
958 hdr
= (struct ieee80211_hdr
*)(pkt
->u
.raw
+
959 sizeof(struct iwl4965_rx_mpdu_res_start
));
960 len
= le16_to_cpu(amsdu
->byte_count
);
961 rx_start
->byte_count
= amsdu
->byte_count
;
962 rx_end
= (__le32
*) (((u8
*) hdr
) + len
);
965 ampdu_status
= le32_to_cpu(*rx_end
);
966 skblen
= ((u8
*) rx_end
- (u8
*) &pkt
->u
.raw
[0]) + sizeof(u32
);
969 /* New status scheme, need to translate */
970 ampdu_status_legacy
= ampdu_status
;
971 ampdu_status
= iwl_translate_rx_status(priv
, ampdu_status
);
975 skb_reserve(rxb
->skb
, (void *)hdr
- (void *)pkt
);
976 skb_put(rxb
->skb
, len
); /* end where data ends */
978 /* We only process data packets if the interface is open */
979 if (unlikely(!priv
->is_open
)) {
981 ("Dropping packet while interface is not open.\n");
985 hdr
= (struct ieee80211_hdr
*)rxb
->skb
->data
;
987 /* in case of HW accelerated crypto and bad decryption, drop */
988 if (!priv
->hw_params
.sw_crypto
&&
989 iwl_set_decrypted_flag(priv
, hdr
, ampdu_status
, stats
))
992 iwl_update_rx_stats(priv
, le16_to_cpu(hdr
->frame_control
), len
);
993 ieee80211_rx_irqsafe(priv
->hw
, rxb
->skb
, stats
);
994 priv
->alloc_rxb_skb
--;
998 /* Calc max signal level (dBm) among 3 possible receivers */
999 static inline int iwl_calc_rssi(struct iwl_priv
*priv
,
1000 struct iwl_rx_phy_res
*rx_resp
)
1002 return priv
->cfg
->ops
->utils
->calc_rssi(priv
, rx_resp
);
1006 static void iwl_sta_modify_ps_wake(struct iwl_priv
*priv
, int sta_id
)
1008 unsigned long flags
;
1010 spin_lock_irqsave(&priv
->sta_lock
, flags
);
1011 priv
->stations
[sta_id
].sta
.station_flags
&= ~STA_FLG_PWR_SAVE_MSK
;
1012 priv
->stations
[sta_id
].sta
.station_flags_msk
= STA_FLG_PWR_SAVE_MSK
;
1013 priv
->stations
[sta_id
].sta
.sta
.modify_mask
= 0;
1014 priv
->stations
[sta_id
].sta
.mode
= STA_CONTROL_MODIFY_MSK
;
1015 spin_unlock_irqrestore(&priv
->sta_lock
, flags
);
1017 iwl_send_add_sta(priv
, &priv
->stations
[sta_id
].sta
, CMD_ASYNC
);
1020 static void iwl_update_ps_mode(struct iwl_priv
*priv
, u16 ps_bit
, u8
*addr
)
1022 /* FIXME: need locking over ps_status ??? */
1023 u8 sta_id
= iwl_find_station(priv
, addr
);
1025 if (sta_id
!= IWL_INVALID_STATION
) {
1026 u8 sta_awake
= priv
->stations
[sta_id
].
1027 ps_status
== STA_PS_STATUS_WAKE
;
1029 if (sta_awake
&& ps_bit
)
1030 priv
->stations
[sta_id
].ps_status
= STA_PS_STATUS_SLEEP
;
1031 else if (!sta_awake
&& !ps_bit
) {
1032 iwl_sta_modify_ps_wake(priv
, sta_id
);
1033 priv
->stations
[sta_id
].ps_status
= STA_PS_STATUS_WAKE
;
1038 /* This is necessary only for a number of statistics, see the caller. */
1039 static int iwl_is_network_packet(struct iwl_priv
*priv
,
1040 struct ieee80211_hdr
*header
)
1042 /* Filter incoming packets to determine if they are targeted toward
1043 * this network, discarding packets coming from ourselves */
1044 switch (priv
->iw_mode
) {
1045 case NL80211_IFTYPE_ADHOC
: /* Header: Dest. | Source | BSSID */
1046 /* packets to our IBSS update information */
1047 return !compare_ether_addr(header
->addr3
, priv
->bssid
);
1048 case NL80211_IFTYPE_STATION
: /* Header: Dest. | AP{BSSID} | Source */
1049 /* packets to our IBSS update information */
1050 return !compare_ether_addr(header
->addr2
, priv
->bssid
);
1056 /* Called for REPLY_RX (legacy ABG frames), or
1057 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
1058 void iwl_rx_reply_rx(struct iwl_priv
*priv
,
1059 struct iwl_rx_mem_buffer
*rxb
)
1061 struct ieee80211_hdr
*header
;
1062 struct ieee80211_rx_status rx_status
;
1063 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
1064 /* Use phy data (Rx signal strength, etc.) contained within
1065 * this rx packet for legacy frames,
1066 * or phy data cached from REPLY_RX_PHY_CMD for HT frames. */
1067 int include_phy
= (pkt
->hdr
.cmd
== REPLY_RX
);
1068 struct iwl_rx_phy_res
*rx_start
= (include_phy
) ?
1069 (struct iwl_rx_phy_res
*)&(pkt
->u
.raw
[0]) :
1070 (struct iwl_rx_phy_res
*)&priv
->last_phy_res
[1];
1072 unsigned int len
= 0;
1076 rx_status
.mactime
= le64_to_cpu(rx_start
->timestamp
);
1078 ieee80211_channel_to_frequency(le16_to_cpu(rx_start
->channel
));
1079 rx_status
.band
= (rx_start
->phy_flags
& RX_RES_PHY_FLAGS_BAND_24_MSK
) ?
1080 IEEE80211_BAND_2GHZ
: IEEE80211_BAND_5GHZ
;
1081 rx_status
.rate_idx
=
1082 iwl_hwrate_to_plcp_idx(le32_to_cpu(rx_start
->rate_n_flags
));
1083 if (rx_status
.band
== IEEE80211_BAND_5GHZ
)
1084 rx_status
.rate_idx
-= IWL_FIRST_OFDM_RATE
;
1088 /* TSF isn't reliable. In order to allow smooth user experience,
1089 * this W/A doesn't propagate it to the mac80211 */
1090 /*rx_status.flag |= RX_FLAG_TSFT;*/
1092 if ((unlikely(rx_start
->cfg_phy_cnt
> 20))) {
1093 IWL_DEBUG_DROP("dsp size out of range [0,20]: %d/n",
1094 rx_start
->cfg_phy_cnt
);
1099 if (priv
->last_phy_res
[0])
1100 rx_start
= (struct iwl_rx_phy_res
*)
1101 &priv
->last_phy_res
[1];
1107 IWL_ERROR("MPDU frame without a PHY data\n");
1112 header
= (struct ieee80211_hdr
*)((u8
*) &rx_start
[1]
1113 + rx_start
->cfg_phy_cnt
);
1115 len
= le16_to_cpu(rx_start
->byte_count
);
1116 rx_end
= (__le32
*)(pkt
->u
.raw
+ rx_start
->cfg_phy_cnt
+
1117 sizeof(struct iwl_rx_phy_res
) + len
);
1119 struct iwl4965_rx_mpdu_res_start
*amsdu
=
1120 (struct iwl4965_rx_mpdu_res_start
*)pkt
->u
.raw
;
1122 header
= (void *)(pkt
->u
.raw
+
1123 sizeof(struct iwl4965_rx_mpdu_res_start
));
1124 len
= le16_to_cpu(amsdu
->byte_count
);
1125 rx_end
= (__le32
*) (pkt
->u
.raw
+
1126 sizeof(struct iwl4965_rx_mpdu_res_start
) + len
);
1129 if (!(*rx_end
& RX_RES_STATUS_NO_CRC32_ERROR
) ||
1130 !(*rx_end
& RX_RES_STATUS_NO_RXE_OVERFLOW
)) {
1131 IWL_DEBUG_RX("Bad CRC or FIFO: 0x%08X.\n",
1132 le32_to_cpu(*rx_end
));
1136 priv
->ucode_beacon_time
= le32_to_cpu(rx_start
->beacon_time_stamp
);
1138 /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1139 rx_status
.signal
= iwl_calc_rssi(priv
, rx_start
);
1141 /* Meaningful noise values are available only from beacon statistics,
1142 * which are gathered only when associated, and indicate noise
1143 * only for the associated network channel ...
1144 * Ignore these noise values while scanning (other channels) */
1145 if (iwl_is_associated(priv
) &&
1146 !test_bit(STATUS_SCANNING
, &priv
->status
)) {
1147 rx_status
.noise
= priv
->last_rx_noise
;
1148 rx_status
.qual
= iwl_calc_sig_qual(rx_status
.signal
,
1151 rx_status
.noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
1152 rx_status
.qual
= iwl_calc_sig_qual(rx_status
.signal
, 0);
1155 /* Reset beacon noise level if not associated. */
1156 if (!iwl_is_associated(priv
))
1157 priv
->last_rx_noise
= IWL_NOISE_MEAS_NOT_AVAILABLE
;
1159 /* Set "1" to report good data frames in groups of 100 */
1160 /* FIXME: need to optimze the call: */
1161 iwl_dbg_report_frame(priv
, pkt
, header
, 1);
1163 IWL_DEBUG_STATS_LIMIT("Rssi %d, noise %d, qual %d, TSF %llu\n",
1164 rx_status
.signal
, rx_status
.noise
, rx_status
.signal
,
1165 (unsigned long long)rx_status
.mactime
);
1170 * It seems that the antenna field in the phy flags value
1171 * is actually a bitfield. This is undefined by radiotap,
1172 * it wants an actual antenna number but I always get "7"
1173 * for most legacy frames I receive indicating that the
1174 * same frame was received on all three RX chains.
1176 * I think this field should be removed in favour of a
1177 * new 802.11n radiotap field "RX chains" that is defined
1180 rx_status
.antenna
= le16_to_cpu(rx_start
->phy_flags
&
1181 RX_RES_PHY_FLAGS_ANTENNA_MSK
) >> 4;
1183 /* set the preamble flag if appropriate */
1184 if (rx_start
->phy_flags
& RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK
)
1185 rx_status
.flag
|= RX_FLAG_SHORTPRE
;
1187 /* Take shortcut when only in monitor mode */
1188 if (priv
->iw_mode
== NL80211_IFTYPE_MONITOR
) {
1189 iwl_pass_packet_to_mac80211(priv
, include_phy
,
1194 network_packet
= iwl_is_network_packet(priv
, header
);
1195 if (network_packet
) {
1196 priv
->last_rx_rssi
= rx_status
.signal
;
1197 priv
->last_beacon_time
= priv
->ucode_beacon_time
;
1198 priv
->last_tsf
= le64_to_cpu(rx_start
->timestamp
);
1201 fc
= le16_to_cpu(header
->frame_control
);
1202 switch (fc
& IEEE80211_FCTL_FTYPE
) {
1203 case IEEE80211_FTYPE_MGMT
:
1204 case IEEE80211_FTYPE_DATA
:
1205 if (priv
->iw_mode
== NL80211_IFTYPE_AP
)
1206 iwl_update_ps_mode(priv
, fc
& IEEE80211_FCTL_PM
,
1210 iwl_pass_packet_to_mac80211(priv
, include_phy
, rxb
,
1216 EXPORT_SYMBOL(iwl_rx_reply_rx
);
1218 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1219 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1220 void iwl_rx_reply_rx_phy(struct iwl_priv
*priv
,
1221 struct iwl_rx_mem_buffer
*rxb
)
1223 struct iwl_rx_packet
*pkt
= (struct iwl_rx_packet
*)rxb
->skb
->data
;
1224 priv
->last_phy_res
[0] = 1;
1225 memcpy(&priv
->last_phy_res
[1], &(pkt
->u
.raw
[0]),
1226 sizeof(struct iwl_rx_phy_res
));
1228 EXPORT_SYMBOL(iwl_rx_reply_rx_phy
);