1 /******************************************************************************
5 * Copyright(c) 2008 - 2012 Intel Corporation. All rights reserved.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
28 #include <linux/slab.h>
29 #include <linux/types.h>
30 #include <linux/etherdevice.h>
31 #include <net/mac80211.h>
33 #include "iwl-eeprom.h"
38 #include "iwl-trans.h"
40 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
41 * sending probe req. This should be set long enough to hear probe responses
42 * from more than one AP. */
43 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
44 #define IWL_ACTIVE_DWELL_TIME_52 (20)
46 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
47 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
49 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
50 * Must be set longer than active dwell time.
51 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
52 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
53 #define IWL_PASSIVE_DWELL_TIME_52 (10)
54 #define IWL_PASSIVE_DWELL_BASE (100)
55 #define IWL_CHANNEL_TUNE_TIME 5
57 static int iwl_send_scan_abort(struct iwl_priv
*priv
)
60 struct iwl_rx_packet
*pkt
;
61 struct iwl_host_cmd cmd
= {
62 .id
= REPLY_SCAN_ABORT_CMD
,
63 .flags
= CMD_SYNC
| CMD_WANT_SKB
,
66 /* Exit instantly with error when device is not ready
67 * to receive scan abort command or it does not perform
68 * hardware scan currently */
69 if (!test_bit(STATUS_READY
, &priv
->shrd
->status
) ||
70 !test_bit(STATUS_GEO_CONFIGURED
, &priv
->shrd
->status
) ||
71 !test_bit(STATUS_SCAN_HW
, &priv
->shrd
->status
) ||
72 test_bit(STATUS_FW_ERROR
, &priv
->shrd
->status
) ||
73 test_bit(STATUS_EXIT_PENDING
, &priv
->shrd
->status
))
76 ret
= iwl_trans_send_cmd(trans(priv
), &cmd
);
80 pkt
= (struct iwl_rx_packet
*)cmd
.reply_page
;
81 if (pkt
->u
.status
!= CAN_ABORT_STATUS
) {
82 /* The scan abort will return 1 for success or
83 * 2 for "failure". A failure condition can be
84 * due to simply not being in an active scan which
85 * can occur if we send the scan abort before we
86 * the microcode has notified us that a scan is
88 IWL_DEBUG_SCAN(priv
, "SCAN_ABORT ret %d.\n", pkt
->u
.status
);
92 iwl_free_pages(priv
->shrd
, cmd
.reply_page
);
96 static void iwl_complete_scan(struct iwl_priv
*priv
, bool aborted
)
98 /* check if scan was requested from mac80211 */
99 if (priv
->scan_request
) {
100 IWL_DEBUG_SCAN(priv
, "Complete scan in mac80211\n");
101 ieee80211_scan_completed(priv
->hw
, aborted
);
104 if (priv
->scan_type
== IWL_SCAN_ROC
) {
105 ieee80211_remain_on_channel_expired(priv
->hw
);
106 priv
->hw_roc_channel
= NULL
;
107 schedule_delayed_work(&priv
->hw_roc_disable_work
, 10 * HZ
);
110 priv
->scan_type
= IWL_SCAN_NORMAL
;
111 priv
->scan_vif
= NULL
;
112 priv
->scan_request
= NULL
;
115 static void iwl_process_scan_complete(struct iwl_priv
*priv
)
119 lockdep_assert_held(&priv
->shrd
->mutex
);
121 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE
, &priv
->shrd
->status
))
124 IWL_DEBUG_SCAN(priv
, "Completed scan.\n");
126 cancel_delayed_work(&priv
->scan_check
);
128 aborted
= test_and_clear_bit(STATUS_SCAN_ABORTING
, &priv
->shrd
->status
);
130 IWL_DEBUG_SCAN(priv
, "Aborted scan completed.\n");
132 if (!test_and_clear_bit(STATUS_SCANNING
, &priv
->shrd
->status
)) {
133 IWL_DEBUG_SCAN(priv
, "Scan already completed.\n");
137 if (priv
->scan_type
== IWL_SCAN_ROC
) {
138 ieee80211_remain_on_channel_expired(priv
->hw
);
139 priv
->hw_roc_channel
= NULL
;
140 schedule_delayed_work(&priv
->hw_roc_disable_work
, 10 * HZ
);
143 if (priv
->scan_type
!= IWL_SCAN_NORMAL
&& !aborted
) {
146 /* Check if mac80211 requested scan during our internal scan */
147 if (priv
->scan_request
== NULL
)
150 /* If so request a new scan */
151 err
= iwl_scan_initiate(priv
, priv
->scan_vif
, IWL_SCAN_NORMAL
,
152 priv
->scan_request
->channels
[0]->band
);
155 "failed to initiate pending scan: %d\n", err
);
164 iwl_complete_scan(priv
, aborted
);
167 /* Can we still talk to firmware ? */
168 if (!iwl_is_ready_rf(priv
->shrd
))
171 iwlagn_post_scan(priv
);
174 void iwl_force_scan_end(struct iwl_priv
*priv
)
176 lockdep_assert_held(&priv
->shrd
->mutex
);
178 if (!test_bit(STATUS_SCANNING
, &priv
->shrd
->status
)) {
179 IWL_DEBUG_SCAN(priv
, "Forcing scan end while not scanning\n");
183 IWL_DEBUG_SCAN(priv
, "Forcing scan end\n");
184 clear_bit(STATUS_SCANNING
, &priv
->shrd
->status
);
185 clear_bit(STATUS_SCAN_HW
, &priv
->shrd
->status
);
186 clear_bit(STATUS_SCAN_ABORTING
, &priv
->shrd
->status
);
187 clear_bit(STATUS_SCAN_COMPLETE
, &priv
->shrd
->status
);
188 iwl_complete_scan(priv
, true);
191 static void iwl_do_scan_abort(struct iwl_priv
*priv
)
195 lockdep_assert_held(&priv
->shrd
->mutex
);
197 if (!test_bit(STATUS_SCANNING
, &priv
->shrd
->status
)) {
198 IWL_DEBUG_SCAN(priv
, "Not performing scan to abort\n");
202 if (test_and_set_bit(STATUS_SCAN_ABORTING
, &priv
->shrd
->status
)) {
203 IWL_DEBUG_SCAN(priv
, "Scan abort in progress\n");
207 ret
= iwl_send_scan_abort(priv
);
209 IWL_DEBUG_SCAN(priv
, "Send scan abort failed %d\n", ret
);
210 iwl_force_scan_end(priv
);
212 IWL_DEBUG_SCAN(priv
, "Successfully send scan abort\n");
216 * iwl_scan_cancel - Cancel any currently executing HW scan
218 int iwl_scan_cancel(struct iwl_priv
*priv
)
220 IWL_DEBUG_SCAN(priv
, "Queuing abort scan\n");
221 queue_work(priv
->workqueue
, &priv
->abort_scan
);
226 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
227 * @ms: amount of time to wait (in milliseconds) for scan to abort
230 void iwl_scan_cancel_timeout(struct iwl_priv
*priv
, unsigned long ms
)
232 unsigned long timeout
= jiffies
+ msecs_to_jiffies(ms
);
234 lockdep_assert_held(&priv
->shrd
->mutex
);
236 IWL_DEBUG_SCAN(priv
, "Scan cancel timeout\n");
238 iwl_do_scan_abort(priv
);
240 while (time_before_eq(jiffies
, timeout
)) {
241 if (!test_bit(STATUS_SCAN_HW
, &priv
->shrd
->status
))
250 * Now STATUS_SCAN_HW is clear. This means that the
251 * device finished, but the background work is going
252 * to execute at best as soon as we release the mutex.
253 * Since we need to be able to issue a new scan right
254 * after this function returns, run the complete here.
255 * The STATUS_SCAN_COMPLETE bit will then be cleared
256 * and prevent the background work from "completing"
257 * a possible new scan.
259 iwl_process_scan_complete(priv
);
262 /* Service response to REPLY_SCAN_CMD (0x80) */
263 static int iwl_rx_reply_scan(struct iwl_priv
*priv
,
264 struct iwl_rx_mem_buffer
*rxb
,
265 struct iwl_device_cmd
*cmd
)
267 #ifdef CONFIG_IWLWIFI_DEBUG
268 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
269 struct iwl_scanreq_notification
*notif
=
270 (struct iwl_scanreq_notification
*)pkt
->u
.raw
;
272 IWL_DEBUG_SCAN(priv
, "Scan request status = 0x%x\n", notif
->status
);
277 /* Service SCAN_START_NOTIFICATION (0x82) */
278 static int iwl_rx_scan_start_notif(struct iwl_priv
*priv
,
279 struct iwl_rx_mem_buffer
*rxb
,
280 struct iwl_device_cmd
*cmd
)
282 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
283 struct iwl_scanstart_notification
*notif
=
284 (struct iwl_scanstart_notification
*)pkt
->u
.raw
;
285 priv
->scan_start_tsf
= le32_to_cpu(notif
->tsf_low
);
286 IWL_DEBUG_SCAN(priv
, "Scan start: "
288 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
290 notif
->band
? "bg" : "a",
291 le32_to_cpu(notif
->tsf_high
),
292 le32_to_cpu(notif
->tsf_low
),
293 notif
->status
, notif
->beacon_timer
);
295 if (priv
->scan_type
== IWL_SCAN_ROC
&&
296 !priv
->hw_roc_start_notified
) {
297 ieee80211_ready_on_channel(priv
->hw
);
298 priv
->hw_roc_start_notified
= true;
304 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
305 static int iwl_rx_scan_results_notif(struct iwl_priv
*priv
,
306 struct iwl_rx_mem_buffer
*rxb
,
307 struct iwl_device_cmd
*cmd
)
309 #ifdef CONFIG_IWLWIFI_DEBUG
310 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
311 struct iwl_scanresults_notification
*notif
=
312 (struct iwl_scanresults_notification
*)pkt
->u
.raw
;
314 IWL_DEBUG_SCAN(priv
, "Scan ch.res: "
316 "probe status: %u:%u "
317 "(TSF: 0x%08X:%08X) - %d "
318 "elapsed=%lu usec\n",
320 notif
->band
? "bg" : "a",
321 notif
->probe_status
, notif
->num_probe_not_sent
,
322 le32_to_cpu(notif
->tsf_high
),
323 le32_to_cpu(notif
->tsf_low
),
324 le32_to_cpu(notif
->statistics
[0]),
325 le32_to_cpu(notif
->tsf_low
) - priv
->scan_start_tsf
);
330 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
331 static int iwl_rx_scan_complete_notif(struct iwl_priv
*priv
,
332 struct iwl_rx_mem_buffer
*rxb
,
333 struct iwl_device_cmd
*cmd
)
335 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
336 struct iwl_scancomplete_notification
*scan_notif
= (void *)pkt
->u
.raw
;
338 IWL_DEBUG_SCAN(priv
, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
339 scan_notif
->scanned_channels
,
341 scan_notif
->tsf_high
, scan_notif
->status
);
343 IWL_DEBUG_SCAN(priv
, "Scan on %sGHz took %dms\n",
344 (priv
->scan_band
== IEEE80211_BAND_2GHZ
) ? "2.4" : "5.2",
345 jiffies_to_msecs(jiffies
- priv
->scan_start
));
348 * When aborting, we run the scan completed background work inline
349 * and the background work must then do nothing. The SCAN_COMPLETE
350 * bit helps implement that logic and thus needs to be set before
351 * queueing the work. Also, since the scan abort waits for SCAN_HW
352 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
353 * to avoid a race there.
355 set_bit(STATUS_SCAN_COMPLETE
, &priv
->shrd
->status
);
356 clear_bit(STATUS_SCAN_HW
, &priv
->shrd
->status
);
357 queue_work(priv
->workqueue
, &priv
->scan_completed
);
359 if (priv
->iw_mode
!= NL80211_IFTYPE_ADHOC
&&
360 iwl_advanced_bt_coexist(priv
) &&
361 priv
->bt_status
!= scan_notif
->bt_status
) {
362 if (scan_notif
->bt_status
) {
364 if (!priv
->bt_ch_announce
)
365 priv
->bt_traffic_load
=
366 IWL_BT_COEX_TRAFFIC_LOAD_HIGH
;
368 * otherwise, no traffic load information provided
373 priv
->bt_traffic_load
=
374 IWL_BT_COEX_TRAFFIC_LOAD_NONE
;
376 priv
->bt_status
= scan_notif
->bt_status
;
377 queue_work(priv
->workqueue
,
378 &priv
->bt_traffic_change_work
);
383 void iwl_setup_rx_scan_handlers(struct iwl_priv
*priv
)
386 priv
->rx_handlers
[REPLY_SCAN_CMD
] = iwl_rx_reply_scan
;
387 priv
->rx_handlers
[SCAN_START_NOTIFICATION
] = iwl_rx_scan_start_notif
;
388 priv
->rx_handlers
[SCAN_RESULTS_NOTIFICATION
] =
389 iwl_rx_scan_results_notif
;
390 priv
->rx_handlers
[SCAN_COMPLETE_NOTIFICATION
] =
391 iwl_rx_scan_complete_notif
;
394 static u16
iwl_get_active_dwell_time(struct iwl_priv
*priv
,
395 enum ieee80211_band band
, u8 n_probes
)
397 if (band
== IEEE80211_BAND_5GHZ
)
398 return IWL_ACTIVE_DWELL_TIME_52
+
399 IWL_ACTIVE_DWELL_FACTOR_52GHZ
* (n_probes
+ 1);
401 return IWL_ACTIVE_DWELL_TIME_24
+
402 IWL_ACTIVE_DWELL_FACTOR_24GHZ
* (n_probes
+ 1);
405 static u16
iwl_limit_dwell(struct iwl_priv
*priv
, u16 dwell_time
)
407 struct iwl_rxon_context
*ctx
;
410 * If we're associated, we clamp the dwell time 98%
411 * of the smallest beacon interval (minus 2 * channel
414 for_each_context(priv
, ctx
) {
417 switch (ctx
->staging
.dev_type
) {
418 case RXON_DEV_TYPE_P2P
:
419 /* no timing constraints */
421 case RXON_DEV_TYPE_ESS
:
423 /* timing constraints if associated */
424 if (!iwl_is_associated_ctx(ctx
))
427 case RXON_DEV_TYPE_CP
:
428 case RXON_DEV_TYPE_2STA
:
430 * These seem to always have timers for TBTT
431 * active in uCode even when not associated yet.
436 value
= ctx
->beacon_int
;
438 value
= IWL_PASSIVE_DWELL_BASE
;
439 value
= (value
* 98) / 100 - IWL_CHANNEL_TUNE_TIME
* 2;
440 dwell_time
= min(value
, dwell_time
);
446 static u16
iwl_get_passive_dwell_time(struct iwl_priv
*priv
,
447 enum ieee80211_band band
)
449 u16 passive
= (band
== IEEE80211_BAND_2GHZ
) ?
450 IWL_PASSIVE_DWELL_BASE
+ IWL_PASSIVE_DWELL_TIME_24
:
451 IWL_PASSIVE_DWELL_BASE
+ IWL_PASSIVE_DWELL_TIME_52
;
453 return iwl_limit_dwell(priv
, passive
);
456 static int iwl_get_single_channel_for_scan(struct iwl_priv
*priv
,
457 struct ieee80211_vif
*vif
,
458 enum ieee80211_band band
,
459 struct iwl_scan_channel
*scan_ch
)
461 const struct ieee80211_supported_band
*sband
;
462 u16 passive_dwell
= 0;
463 u16 active_dwell
= 0;
467 sband
= iwl_get_hw_mode(priv
, band
);
469 IWL_ERR(priv
, "invalid band\n");
473 active_dwell
= iwl_get_active_dwell_time(priv
, band
, 0);
474 passive_dwell
= iwl_get_passive_dwell_time(priv
, band
);
476 if (passive_dwell
<= active_dwell
)
477 passive_dwell
= active_dwell
+ 1;
479 channel
= iwl_get_single_channel_number(priv
, band
);
481 scan_ch
->channel
= cpu_to_le16(channel
);
482 scan_ch
->type
= SCAN_CHANNEL_TYPE_PASSIVE
;
483 scan_ch
->active_dwell
= cpu_to_le16(active_dwell
);
484 scan_ch
->passive_dwell
= cpu_to_le16(passive_dwell
);
485 /* Set txpower levels to defaults */
486 scan_ch
->dsp_atten
= 110;
487 if (band
== IEEE80211_BAND_5GHZ
)
488 scan_ch
->tx_gain
= ((1 << 5) | (3 << 3)) | 3;
490 scan_ch
->tx_gain
= ((1 << 5) | (5 << 3));
493 IWL_ERR(priv
, "no valid channel found\n");
497 static int iwl_get_channels_for_scan(struct iwl_priv
*priv
,
498 struct ieee80211_vif
*vif
,
499 enum ieee80211_band band
,
500 u8 is_active
, u8 n_probes
,
501 struct iwl_scan_channel
*scan_ch
)
503 struct ieee80211_channel
*chan
;
504 const struct ieee80211_supported_band
*sband
;
505 const struct iwl_channel_info
*ch_info
;
506 u16 passive_dwell
= 0;
507 u16 active_dwell
= 0;
511 sband
= iwl_get_hw_mode(priv
, band
);
515 active_dwell
= iwl_get_active_dwell_time(priv
, band
, n_probes
);
516 passive_dwell
= iwl_get_passive_dwell_time(priv
, band
);
518 if (passive_dwell
<= active_dwell
)
519 passive_dwell
= active_dwell
+ 1;
521 for (i
= 0, added
= 0; i
< priv
->scan_request
->n_channels
; i
++) {
522 chan
= priv
->scan_request
->channels
[i
];
524 if (chan
->band
!= band
)
527 channel
= chan
->hw_value
;
528 scan_ch
->channel
= cpu_to_le16(channel
);
530 ch_info
= iwl_get_channel_info(priv
, band
, channel
);
531 if (!is_channel_valid(ch_info
)) {
533 "Channel %d is INVALID for this band.\n",
538 if (!is_active
|| is_channel_passive(ch_info
) ||
539 (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
))
540 scan_ch
->type
= SCAN_CHANNEL_TYPE_PASSIVE
;
542 scan_ch
->type
= SCAN_CHANNEL_TYPE_ACTIVE
;
545 scan_ch
->type
|= IWL_SCAN_PROBE_MASK(n_probes
);
547 scan_ch
->active_dwell
= cpu_to_le16(active_dwell
);
548 scan_ch
->passive_dwell
= cpu_to_le16(passive_dwell
);
550 /* Set txpower levels to defaults */
551 scan_ch
->dsp_atten
= 110;
553 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
555 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
557 if (band
== IEEE80211_BAND_5GHZ
)
558 scan_ch
->tx_gain
= ((1 << 5) | (3 << 3)) | 3;
560 scan_ch
->tx_gain
= ((1 << 5) | (5 << 3));
562 IWL_DEBUG_SCAN(priv
, "Scanning ch=%d prob=0x%X [%s %d]\n",
563 channel
, le32_to_cpu(scan_ch
->type
),
564 (scan_ch
->type
& SCAN_CHANNEL_TYPE_ACTIVE
) ?
565 "ACTIVE" : "PASSIVE",
566 (scan_ch
->type
& SCAN_CHANNEL_TYPE_ACTIVE
) ?
567 active_dwell
: passive_dwell
);
573 IWL_DEBUG_SCAN(priv
, "total channels to scan %d\n", added
);
577 static int iwlagn_request_scan(struct iwl_priv
*priv
, struct ieee80211_vif
*vif
)
579 struct iwl_host_cmd cmd
= {
580 .id
= REPLY_SCAN_CMD
,
581 .len
= { sizeof(struct iwl_scan_cmd
), },
584 struct iwl_scan_cmd
*scan
;
585 struct iwl_rxon_context
*ctx
= &priv
->contexts
[IWL_RXON_CTX_BSS
];
589 enum ieee80211_band band
;
591 u8 rx_ant
= hw_params(priv
).valid_rx_ant
;
593 bool is_active
= false;
596 u8 scan_tx_antennas
= hw_params(priv
).valid_tx_ant
;
599 lockdep_assert_held(&priv
->shrd
->mutex
);
602 ctx
= iwl_rxon_ctx_from_vif(vif
);
604 if (!priv
->scan_cmd
) {
605 priv
->scan_cmd
= kmalloc(sizeof(struct iwl_scan_cmd
) +
606 IWL_MAX_SCAN_SIZE
, GFP_KERNEL
);
607 if (!priv
->scan_cmd
) {
609 "fail to allocate memory for scan\n");
613 scan
= priv
->scan_cmd
;
614 memset(scan
, 0, sizeof(struct iwl_scan_cmd
) + IWL_MAX_SCAN_SIZE
);
616 scan
->quiet_plcp_th
= IWL_PLCP_QUIET_THRESH
;
617 scan
->quiet_time
= IWL_ACTIVE_QUIET_TIME
;
619 if (priv
->scan_type
!= IWL_SCAN_ROC
&&
620 iwl_is_any_associated(priv
)) {
623 u32 suspend_time
= 100;
624 u32 scan_suspend_time
= 100;
626 IWL_DEBUG_INFO(priv
, "Scanning while associated...\n");
627 switch (priv
->scan_type
) {
631 case IWL_SCAN_RADIO_RESET
:
634 case IWL_SCAN_NORMAL
:
635 interval
= vif
->bss_conf
.beacon_int
;
639 scan
->suspend_time
= 0;
640 scan
->max_out_time
= cpu_to_le32(200 * 1024);
642 interval
= suspend_time
;
644 extra
= (suspend_time
/ interval
) << 22;
645 scan_suspend_time
= (extra
|
646 ((suspend_time
% interval
) * 1024));
647 scan
->suspend_time
= cpu_to_le32(scan_suspend_time
);
648 IWL_DEBUG_SCAN(priv
, "suspend_time 0x%X beacon interval %d\n",
649 scan_suspend_time
, interval
);
650 } else if (priv
->scan_type
== IWL_SCAN_ROC
) {
651 scan
->suspend_time
= 0;
652 scan
->max_out_time
= 0;
653 scan
->quiet_time
= 0;
654 scan
->quiet_plcp_th
= 0;
657 switch (priv
->scan_type
) {
658 case IWL_SCAN_RADIO_RESET
:
659 IWL_DEBUG_SCAN(priv
, "Start internal passive scan.\n");
661 case IWL_SCAN_NORMAL
:
662 if (priv
->scan_request
->n_ssids
) {
664 IWL_DEBUG_SCAN(priv
, "Kicking off active scan\n");
665 for (i
= 0; i
< priv
->scan_request
->n_ssids
; i
++) {
666 /* always does wildcard anyway */
667 if (!priv
->scan_request
->ssids
[i
].ssid_len
)
669 scan
->direct_scan
[p
].id
= WLAN_EID_SSID
;
670 scan
->direct_scan
[p
].len
=
671 priv
->scan_request
->ssids
[i
].ssid_len
;
672 memcpy(scan
->direct_scan
[p
].ssid
,
673 priv
->scan_request
->ssids
[i
].ssid
,
674 priv
->scan_request
->ssids
[i
].ssid_len
);
680 IWL_DEBUG_SCAN(priv
, "Start passive scan.\n");
683 IWL_DEBUG_SCAN(priv
, "Start ROC scan.\n");
687 scan
->tx_cmd
.tx_flags
= TX_CMD_FLG_SEQ_CTL_MSK
;
688 scan
->tx_cmd
.sta_id
= ctx
->bcast_sta_id
;
689 scan
->tx_cmd
.stop_time
.life_time
= TX_CMD_LIFE_TIME_INFINITE
;
691 switch (priv
->scan_band
) {
692 case IEEE80211_BAND_2GHZ
:
693 scan
->flags
= RXON_FLG_BAND_24G_MSK
| RXON_FLG_AUTO_DETECT_MSK
;
694 chan_mod
= le32_to_cpu(
695 priv
->contexts
[IWL_RXON_CTX_BSS
].active
.flags
&
696 RXON_FLG_CHANNEL_MODE_MSK
)
697 >> RXON_FLG_CHANNEL_MODE_POS
;
698 if ((priv
->scan_request
&& priv
->scan_request
->no_cck
) ||
699 chan_mod
== CHANNEL_MODE_PURE_40
) {
700 rate
= IWL_RATE_6M_PLCP
;
702 rate
= IWL_RATE_1M_PLCP
;
703 rate_flags
= RATE_MCS_CCK_MSK
;
706 * Internal scans are passive, so we can indiscriminately set
707 * the BT ignore flag on 2.4 GHz since it applies to TX only.
709 if (cfg(priv
)->bt_params
&&
710 cfg(priv
)->bt_params
->advanced_bt_coexist
)
711 scan
->tx_cmd
.tx_flags
|= TX_CMD_FLG_IGNORE_BT
;
713 case IEEE80211_BAND_5GHZ
:
714 rate
= IWL_RATE_6M_PLCP
;
717 IWL_WARN(priv
, "Invalid scan band\n");
722 * If active scanning is requested but a certain channel is
723 * marked passive, we can do active scanning if we detect
726 * There is an issue with some firmware versions that triggers
727 * a sysassert on a "good CRC threshold" of zero (== disabled),
728 * on a radar channel even though this means that we should NOT
731 * The "good CRC threshold" is the number of frames that we
732 * need to receive during our dwell time on a channel before
733 * sending out probes -- setting this to a huge value will
734 * mean we never reach it, but at the same time work around
735 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
736 * here instead of IWL_GOOD_CRC_TH_DISABLED.
738 * This was fixed in later versions along with some other
739 * scan changes, and the threshold behaves as a flag in those
742 if (priv
->new_scan_threshold_behaviour
)
743 scan
->good_CRC_th
= is_active
? IWL_GOOD_CRC_TH_DEFAULT
:
744 IWL_GOOD_CRC_TH_DISABLED
;
746 scan
->good_CRC_th
= is_active
? IWL_GOOD_CRC_TH_DEFAULT
:
747 IWL_GOOD_CRC_TH_NEVER
;
749 band
= priv
->scan_band
;
751 if (cfg(priv
)->scan_rx_antennas
[band
])
752 rx_ant
= cfg(priv
)->scan_rx_antennas
[band
];
754 if (band
== IEEE80211_BAND_2GHZ
&&
755 cfg(priv
)->bt_params
&&
756 cfg(priv
)->bt_params
->advanced_bt_coexist
) {
757 /* transmit 2.4 GHz probes only on first antenna */
758 scan_tx_antennas
= first_antenna(scan_tx_antennas
);
761 priv
->scan_tx_ant
[band
] = iwl_toggle_tx_ant(priv
,
762 priv
->scan_tx_ant
[band
],
764 rate_flags
|= iwl_ant_idx_to_flags(priv
->scan_tx_ant
[band
]);
765 scan
->tx_cmd
.rate_n_flags
= iwl_hw_set_rate_n_flags(rate
, rate_flags
);
767 /* In power save mode use one chain, otherwise use all chains */
768 if (test_bit(STATUS_POWER_PMI
, &priv
->shrd
->status
)) {
769 /* rx_ant has been set to all valid chains previously */
770 active_chains
= rx_ant
&
771 ((u8
)(priv
->chain_noise_data
.active_chains
));
773 active_chains
= rx_ant
;
775 IWL_DEBUG_SCAN(priv
, "chain_noise_data.active_chains: %u\n",
776 priv
->chain_noise_data
.active_chains
);
778 rx_ant
= first_antenna(active_chains
);
780 if (cfg(priv
)->bt_params
&&
781 cfg(priv
)->bt_params
->advanced_bt_coexist
&&
782 priv
->bt_full_concurrent
) {
783 /* operated as 1x1 in full concurrency mode */
784 rx_ant
= first_antenna(rx_ant
);
787 /* MIMO is not used here, but value is required */
789 hw_params(priv
).valid_rx_ant
<< RXON_RX_CHAIN_VALID_POS
;
790 rx_chain
|= rx_ant
<< RXON_RX_CHAIN_FORCE_MIMO_SEL_POS
;
791 rx_chain
|= rx_ant
<< RXON_RX_CHAIN_FORCE_SEL_POS
;
792 rx_chain
|= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS
;
793 scan
->rx_chain
= cpu_to_le16(rx_chain
);
794 switch (priv
->scan_type
) {
795 case IWL_SCAN_NORMAL
:
796 cmd_len
= iwl_fill_probe_req(priv
,
797 (struct ieee80211_mgmt
*)scan
->data
,
799 priv
->scan_request
->ie
,
800 priv
->scan_request
->ie_len
,
801 IWL_MAX_SCAN_SIZE
- sizeof(*scan
));
803 case IWL_SCAN_RADIO_RESET
:
805 /* use bcast addr, will not be transmitted but must be valid */
806 cmd_len
= iwl_fill_probe_req(priv
,
807 (struct ieee80211_mgmt
*)scan
->data
,
808 iwl_bcast_addr
, NULL
, 0,
809 IWL_MAX_SCAN_SIZE
- sizeof(*scan
));
814 scan
->tx_cmd
.len
= cpu_to_le16(cmd_len
);
816 scan
->filter_flags
|= (RXON_FILTER_ACCEPT_GRP_MSK
|
817 RXON_FILTER_BCON_AWARE_MSK
);
819 switch (priv
->scan_type
) {
820 case IWL_SCAN_RADIO_RESET
:
821 scan
->channel_count
=
822 iwl_get_single_channel_for_scan(priv
, vif
, band
,
823 (void *)&scan
->data
[cmd_len
]);
825 case IWL_SCAN_NORMAL
:
826 scan
->channel_count
=
827 iwl_get_channels_for_scan(priv
, vif
, band
,
829 (void *)&scan
->data
[cmd_len
]);
832 struct iwl_scan_channel
*scan_ch
;
836 dwell
= iwl_limit_dwell(priv
, priv
->hw_roc_duration
);
837 n_chan
= DIV_ROUND_UP(priv
->hw_roc_duration
, dwell
);
839 scan
->channel_count
= n_chan
;
841 scan_ch
= (void *)&scan
->data
[cmd_len
];
843 for (i
= 0; i
< n_chan
; i
++) {
844 scan_ch
->type
= SCAN_CHANNEL_TYPE_PASSIVE
;
846 cpu_to_le16(priv
->hw_roc_channel
->hw_value
);
849 dwell
= priv
->hw_roc_duration
- i
* dwell
;
851 scan_ch
->active_dwell
=
852 scan_ch
->passive_dwell
= cpu_to_le16(dwell
);
854 /* Set txpower levels to defaults */
855 scan_ch
->dsp_atten
= 110;
857 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
859 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
861 if (priv
->hw_roc_channel
->band
== IEEE80211_BAND_5GHZ
)
862 scan_ch
->tx_gain
= ((1 << 5) | (3 << 3)) | 3;
864 scan_ch
->tx_gain
= ((1 << 5) | (5 << 3));
873 if (scan
->channel_count
== 0) {
874 IWL_DEBUG_SCAN(priv
, "channel count %d\n", scan
->channel_count
);
878 cmd
.len
[0] += le16_to_cpu(scan
->tx_cmd
.len
) +
879 scan
->channel_count
* sizeof(struct iwl_scan_channel
);
881 cmd
.dataflags
[0] = IWL_HCMD_DFL_NOCOPY
;
882 scan
->len
= cpu_to_le16(cmd
.len
[0]);
884 /* set scan bit here for PAN params */
885 set_bit(STATUS_SCAN_HW
, &priv
->shrd
->status
);
887 ret
= iwlagn_set_pan_params(priv
);
891 ret
= iwl_trans_send_cmd(trans(priv
), &cmd
);
893 clear_bit(STATUS_SCAN_HW
, &priv
->shrd
->status
);
894 iwlagn_set_pan_params(priv
);
900 void iwl_init_scan_params(struct iwl_priv
*priv
)
902 u8 ant_idx
= fls(hw_params(priv
).valid_tx_ant
) - 1;
903 if (!priv
->scan_tx_ant
[IEEE80211_BAND_5GHZ
])
904 priv
->scan_tx_ant
[IEEE80211_BAND_5GHZ
] = ant_idx
;
905 if (!priv
->scan_tx_ant
[IEEE80211_BAND_2GHZ
])
906 priv
->scan_tx_ant
[IEEE80211_BAND_2GHZ
] = ant_idx
;
909 int __must_check
iwl_scan_initiate(struct iwl_priv
*priv
,
910 struct ieee80211_vif
*vif
,
911 enum iwl_scan_type scan_type
,
912 enum ieee80211_band band
)
916 lockdep_assert_held(&priv
->shrd
->mutex
);
918 cancel_delayed_work(&priv
->scan_check
);
920 if (!iwl_is_ready_rf(priv
->shrd
)) {
921 IWL_WARN(priv
, "Request scan called when driver not ready.\n");
925 if (test_bit(STATUS_SCAN_HW
, &priv
->shrd
->status
)) {
927 "Multiple concurrent scan requests in parallel.\n");
931 if (test_bit(STATUS_SCAN_ABORTING
, &priv
->shrd
->status
)) {
932 IWL_DEBUG_SCAN(priv
, "Scan request while abort pending.\n");
936 IWL_DEBUG_SCAN(priv
, "Starting %sscan...\n",
937 scan_type
== IWL_SCAN_NORMAL
? "" :
938 scan_type
== IWL_SCAN_ROC
? "remain-on-channel " :
941 set_bit(STATUS_SCANNING
, &priv
->shrd
->status
);
942 priv
->scan_type
= scan_type
;
943 priv
->scan_start
= jiffies
;
944 priv
->scan_band
= band
;
946 ret
= iwlagn_request_scan(priv
, vif
);
948 clear_bit(STATUS_SCANNING
, &priv
->shrd
->status
);
949 priv
->scan_type
= IWL_SCAN_NORMAL
;
953 queue_delayed_work(priv
->workqueue
, &priv
->scan_check
,
954 IWL_SCAN_CHECK_WATCHDOG
);
961 * internal short scan, this function should only been called while associated.
962 * It will reset and tune the radio to prevent possible RF related problem
964 void iwl_internal_short_hw_scan(struct iwl_priv
*priv
)
966 queue_work(priv
->workqueue
, &priv
->start_internal_scan
);
969 static void iwl_bg_start_internal_scan(struct work_struct
*work
)
971 struct iwl_priv
*priv
=
972 container_of(work
, struct iwl_priv
, start_internal_scan
);
974 IWL_DEBUG_SCAN(priv
, "Start internal scan\n");
976 mutex_lock(&priv
->shrd
->mutex
);
978 if (priv
->scan_type
== IWL_SCAN_RADIO_RESET
) {
979 IWL_DEBUG_SCAN(priv
, "Internal scan already in progress\n");
983 if (test_bit(STATUS_SCANNING
, &priv
->shrd
->status
)) {
984 IWL_DEBUG_SCAN(priv
, "Scan already in progress.\n");
988 if (iwl_scan_initiate(priv
, NULL
, IWL_SCAN_RADIO_RESET
, priv
->band
))
989 IWL_DEBUG_SCAN(priv
, "failed to start internal short scan\n");
991 mutex_unlock(&priv
->shrd
->mutex
);
994 static void iwl_bg_scan_check(struct work_struct
*data
)
996 struct iwl_priv
*priv
=
997 container_of(data
, struct iwl_priv
, scan_check
.work
);
999 IWL_DEBUG_SCAN(priv
, "Scan check work\n");
1001 /* Since we are here firmware does not finish scan and
1002 * most likely is in bad shape, so we don't bother to
1003 * send abort command, just force scan complete to mac80211 */
1004 mutex_lock(&priv
->shrd
->mutex
);
1005 iwl_force_scan_end(priv
);
1006 mutex_unlock(&priv
->shrd
->mutex
);
1010 * iwl_fill_probe_req - fill in all required fields and IE for probe request
1013 u16
iwl_fill_probe_req(struct iwl_priv
*priv
, struct ieee80211_mgmt
*frame
,
1014 const u8
*ta
, const u8
*ies
, int ie_len
, int left
)
1019 /* Make sure there is enough space for the probe request,
1020 * two mandatory IEs and the data */
1025 frame
->frame_control
= cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
);
1026 memcpy(frame
->da
, iwl_bcast_addr
, ETH_ALEN
);
1027 memcpy(frame
->sa
, ta
, ETH_ALEN
);
1028 memcpy(frame
->bssid
, iwl_bcast_addr
, ETH_ALEN
);
1029 frame
->seq_ctrl
= 0;
1034 pos
= &frame
->u
.probe_req
.variable
[0];
1036 /* fill in our indirect SSID IE */
1040 *pos
++ = WLAN_EID_SSID
;
1045 if (WARN_ON(left
< ie_len
))
1048 if (ies
&& ie_len
) {
1049 memcpy(pos
, ies
, ie_len
);
1056 static void iwl_bg_abort_scan(struct work_struct
*work
)
1058 struct iwl_priv
*priv
= container_of(work
, struct iwl_priv
, abort_scan
);
1060 IWL_DEBUG_SCAN(priv
, "Abort scan work\n");
1062 /* We keep scan_check work queued in case when firmware will not
1063 * report back scan completed notification */
1064 mutex_lock(&priv
->shrd
->mutex
);
1065 iwl_scan_cancel_timeout(priv
, 200);
1066 mutex_unlock(&priv
->shrd
->mutex
);
1069 static void iwl_bg_scan_completed(struct work_struct
*work
)
1071 struct iwl_priv
*priv
=
1072 container_of(work
, struct iwl_priv
, scan_completed
);
1074 mutex_lock(&priv
->shrd
->mutex
);
1075 iwl_process_scan_complete(priv
);
1076 mutex_unlock(&priv
->shrd
->mutex
);
1079 void iwl_setup_scan_deferred_work(struct iwl_priv
*priv
)
1081 INIT_WORK(&priv
->scan_completed
, iwl_bg_scan_completed
);
1082 INIT_WORK(&priv
->abort_scan
, iwl_bg_abort_scan
);
1083 INIT_WORK(&priv
->start_internal_scan
, iwl_bg_start_internal_scan
);
1084 INIT_DELAYED_WORK(&priv
->scan_check
, iwl_bg_scan_check
);
1087 void iwl_cancel_scan_deferred_work(struct iwl_priv
*priv
)
1089 cancel_work_sync(&priv
->start_internal_scan
);
1090 cancel_work_sync(&priv
->abort_scan
);
1091 cancel_work_sync(&priv
->scan_completed
);
1093 if (cancel_delayed_work_sync(&priv
->scan_check
)) {
1094 mutex_lock(&priv
->shrd
->mutex
);
1095 iwl_force_scan_end(priv
);
1096 mutex_unlock(&priv
->shrd
->mutex
);