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_host_cmd cmd
= {
61 .id
= REPLY_SCAN_ABORT_CMD
,
62 .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
->status
) ||
70 !test_bit(STATUS_GEO_CONFIGURED
, &priv
->status
) ||
71 !test_bit(STATUS_SCAN_HW
, &priv
->status
) ||
72 test_bit(STATUS_FW_ERROR
, &priv
->shrd
->status
))
75 ret
= iwl_dvm_send_cmd(priv
, &cmd
);
79 status
= (void *)cmd
.resp_pkt
->data
;
80 if (*status
!= CAN_ABORT_STATUS
) {
81 /* The scan abort will return 1 for success or
82 * 2 for "failure". A failure condition can be
83 * due to simply not being in an active scan which
84 * can occur if we send the scan abort before we
85 * the microcode has notified us that a scan is
87 IWL_DEBUG_SCAN(priv
, "SCAN_ABORT ret %d.\n",
88 le32_to_cpu(*status
));
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
->mutex
);
121 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE
, &priv
->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
->status
);
130 IWL_DEBUG_SCAN(priv
, "Aborted scan completed.\n");
132 if (!test_and_clear_bit(STATUS_SCANNING
, &priv
->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
))
171 iwlagn_post_scan(priv
);
174 void iwl_force_scan_end(struct iwl_priv
*priv
)
176 lockdep_assert_held(&priv
->mutex
);
178 if (!test_bit(STATUS_SCANNING
, &priv
->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
->status
);
185 clear_bit(STATUS_SCAN_HW
, &priv
->status
);
186 clear_bit(STATUS_SCAN_ABORTING
, &priv
->status
);
187 clear_bit(STATUS_SCAN_COMPLETE
, &priv
->status
);
188 iwl_complete_scan(priv
, true);
191 static void iwl_do_scan_abort(struct iwl_priv
*priv
)
195 lockdep_assert_held(&priv
->mutex
);
197 if (!test_bit(STATUS_SCANNING
, &priv
->status
)) {
198 IWL_DEBUG_SCAN(priv
, "Not performing scan to abort\n");
202 if (test_and_set_bit(STATUS_SCAN_ABORTING
, &priv
->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
->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
->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_cmd_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
= (void *)pkt
->data
;
271 IWL_DEBUG_SCAN(priv
, "Scan request status = 0x%x\n", notif
->status
);
276 /* Service SCAN_START_NOTIFICATION (0x82) */
277 static int iwl_rx_scan_start_notif(struct iwl_priv
*priv
,
278 struct iwl_rx_cmd_buffer
*rxb
,
279 struct iwl_device_cmd
*cmd
)
281 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
282 struct iwl_scanstart_notification
*notif
= (void *)pkt
->data
;
284 priv
->scan_start_tsf
= le32_to_cpu(notif
->tsf_low
);
285 IWL_DEBUG_SCAN(priv
, "Scan start: "
287 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
289 notif
->band
? "bg" : "a",
290 le32_to_cpu(notif
->tsf_high
),
291 le32_to_cpu(notif
->tsf_low
),
292 notif
->status
, notif
->beacon_timer
);
294 if (priv
->scan_type
== IWL_SCAN_ROC
&&
295 !priv
->hw_roc_start_notified
) {
296 ieee80211_ready_on_channel(priv
->hw
);
297 priv
->hw_roc_start_notified
= true;
303 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
304 static int iwl_rx_scan_results_notif(struct iwl_priv
*priv
,
305 struct iwl_rx_cmd_buffer
*rxb
,
306 struct iwl_device_cmd
*cmd
)
308 #ifdef CONFIG_IWLWIFI_DEBUG
309 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
310 struct iwl_scanresults_notification
*notif
= (void *)pkt
->data
;
312 IWL_DEBUG_SCAN(priv
, "Scan ch.res: "
314 "probe status: %u:%u "
315 "(TSF: 0x%08X:%08X) - %d "
316 "elapsed=%lu usec\n",
318 notif
->band
? "bg" : "a",
319 notif
->probe_status
, notif
->num_probe_not_sent
,
320 le32_to_cpu(notif
->tsf_high
),
321 le32_to_cpu(notif
->tsf_low
),
322 le32_to_cpu(notif
->statistics
[0]),
323 le32_to_cpu(notif
->tsf_low
) - priv
->scan_start_tsf
);
328 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
329 static int iwl_rx_scan_complete_notif(struct iwl_priv
*priv
,
330 struct iwl_rx_cmd_buffer
*rxb
,
331 struct iwl_device_cmd
*cmd
)
333 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
334 struct iwl_scancomplete_notification
*scan_notif
= (void *)pkt
->data
;
336 IWL_DEBUG_SCAN(priv
, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
337 scan_notif
->scanned_channels
,
339 scan_notif
->tsf_high
, scan_notif
->status
);
341 IWL_DEBUG_SCAN(priv
, "Scan on %sGHz took %dms\n",
342 (priv
->scan_band
== IEEE80211_BAND_2GHZ
) ? "2.4" : "5.2",
343 jiffies_to_msecs(jiffies
- priv
->scan_start
));
346 * When aborting, we run the scan completed background work inline
347 * and the background work must then do nothing. The SCAN_COMPLETE
348 * bit helps implement that logic and thus needs to be set before
349 * queueing the work. Also, since the scan abort waits for SCAN_HW
350 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
351 * to avoid a race there.
353 set_bit(STATUS_SCAN_COMPLETE
, &priv
->status
);
354 clear_bit(STATUS_SCAN_HW
, &priv
->status
);
355 queue_work(priv
->workqueue
, &priv
->scan_completed
);
357 if (priv
->iw_mode
!= NL80211_IFTYPE_ADHOC
&&
358 iwl_advanced_bt_coexist(priv
) &&
359 priv
->bt_status
!= scan_notif
->bt_status
) {
360 if (scan_notif
->bt_status
) {
362 if (!priv
->bt_ch_announce
)
363 priv
->bt_traffic_load
=
364 IWL_BT_COEX_TRAFFIC_LOAD_HIGH
;
366 * otherwise, no traffic load information provided
371 priv
->bt_traffic_load
=
372 IWL_BT_COEX_TRAFFIC_LOAD_NONE
;
374 priv
->bt_status
= scan_notif
->bt_status
;
375 queue_work(priv
->workqueue
,
376 &priv
->bt_traffic_change_work
);
381 void iwl_setup_rx_scan_handlers(struct iwl_priv
*priv
)
384 priv
->rx_handlers
[REPLY_SCAN_CMD
] = iwl_rx_reply_scan
;
385 priv
->rx_handlers
[SCAN_START_NOTIFICATION
] = iwl_rx_scan_start_notif
;
386 priv
->rx_handlers
[SCAN_RESULTS_NOTIFICATION
] =
387 iwl_rx_scan_results_notif
;
388 priv
->rx_handlers
[SCAN_COMPLETE_NOTIFICATION
] =
389 iwl_rx_scan_complete_notif
;
392 static u16
iwl_get_active_dwell_time(struct iwl_priv
*priv
,
393 enum ieee80211_band band
, u8 n_probes
)
395 if (band
== IEEE80211_BAND_5GHZ
)
396 return IWL_ACTIVE_DWELL_TIME_52
+
397 IWL_ACTIVE_DWELL_FACTOR_52GHZ
* (n_probes
+ 1);
399 return IWL_ACTIVE_DWELL_TIME_24
+
400 IWL_ACTIVE_DWELL_FACTOR_24GHZ
* (n_probes
+ 1);
403 static u16
iwl_limit_dwell(struct iwl_priv
*priv
, u16 dwell_time
)
405 struct iwl_rxon_context
*ctx
;
408 * If we're associated, we clamp the dwell time 98%
409 * of the smallest beacon interval (minus 2 * channel
412 for_each_context(priv
, ctx
) {
415 switch (ctx
->staging
.dev_type
) {
416 case RXON_DEV_TYPE_P2P
:
417 /* no timing constraints */
419 case RXON_DEV_TYPE_ESS
:
421 /* timing constraints if associated */
422 if (!iwl_is_associated_ctx(ctx
))
425 case RXON_DEV_TYPE_CP
:
426 case RXON_DEV_TYPE_2STA
:
428 * These seem to always have timers for TBTT
429 * active in uCode even when not associated yet.
434 value
= ctx
->beacon_int
;
436 value
= IWL_PASSIVE_DWELL_BASE
;
437 value
= (value
* 98) / 100 - IWL_CHANNEL_TUNE_TIME
* 2;
438 dwell_time
= min(value
, dwell_time
);
444 static u16
iwl_get_passive_dwell_time(struct iwl_priv
*priv
,
445 enum ieee80211_band band
)
447 u16 passive
= (band
== IEEE80211_BAND_2GHZ
) ?
448 IWL_PASSIVE_DWELL_BASE
+ IWL_PASSIVE_DWELL_TIME_24
:
449 IWL_PASSIVE_DWELL_BASE
+ IWL_PASSIVE_DWELL_TIME_52
;
451 return iwl_limit_dwell(priv
, passive
);
454 static int iwl_get_single_channel_for_scan(struct iwl_priv
*priv
,
455 struct ieee80211_vif
*vif
,
456 enum ieee80211_band band
,
457 struct iwl_scan_channel
*scan_ch
)
459 const struct ieee80211_supported_band
*sband
;
460 u16 passive_dwell
= 0;
461 u16 active_dwell
= 0;
465 sband
= iwl_get_hw_mode(priv
, band
);
467 IWL_ERR(priv
, "invalid band\n");
471 active_dwell
= iwl_get_active_dwell_time(priv
, band
, 0);
472 passive_dwell
= iwl_get_passive_dwell_time(priv
, band
);
474 if (passive_dwell
<= active_dwell
)
475 passive_dwell
= active_dwell
+ 1;
477 channel
= iwl_get_single_channel_number(priv
, band
);
479 scan_ch
->channel
= cpu_to_le16(channel
);
480 scan_ch
->type
= SCAN_CHANNEL_TYPE_PASSIVE
;
481 scan_ch
->active_dwell
= cpu_to_le16(active_dwell
);
482 scan_ch
->passive_dwell
= cpu_to_le16(passive_dwell
);
483 /* Set txpower levels to defaults */
484 scan_ch
->dsp_atten
= 110;
485 if (band
== IEEE80211_BAND_5GHZ
)
486 scan_ch
->tx_gain
= ((1 << 5) | (3 << 3)) | 3;
488 scan_ch
->tx_gain
= ((1 << 5) | (5 << 3));
491 IWL_ERR(priv
, "no valid channel found\n");
495 static int iwl_get_channels_for_scan(struct iwl_priv
*priv
,
496 struct ieee80211_vif
*vif
,
497 enum ieee80211_band band
,
498 u8 is_active
, u8 n_probes
,
499 struct iwl_scan_channel
*scan_ch
)
501 struct ieee80211_channel
*chan
;
502 const struct ieee80211_supported_band
*sband
;
503 const struct iwl_channel_info
*ch_info
;
504 u16 passive_dwell
= 0;
505 u16 active_dwell
= 0;
509 sband
= iwl_get_hw_mode(priv
, band
);
513 active_dwell
= iwl_get_active_dwell_time(priv
, band
, n_probes
);
514 passive_dwell
= iwl_get_passive_dwell_time(priv
, band
);
516 if (passive_dwell
<= active_dwell
)
517 passive_dwell
= active_dwell
+ 1;
519 for (i
= 0, added
= 0; i
< priv
->scan_request
->n_channels
; i
++) {
520 chan
= priv
->scan_request
->channels
[i
];
522 if (chan
->band
!= band
)
525 channel
= chan
->hw_value
;
526 scan_ch
->channel
= cpu_to_le16(channel
);
528 ch_info
= iwl_get_channel_info(priv
, band
, channel
);
529 if (!is_channel_valid(ch_info
)) {
531 "Channel %d is INVALID for this band.\n",
536 if (!is_active
|| is_channel_passive(ch_info
) ||
537 (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
))
538 scan_ch
->type
= SCAN_CHANNEL_TYPE_PASSIVE
;
540 scan_ch
->type
= SCAN_CHANNEL_TYPE_ACTIVE
;
543 scan_ch
->type
|= IWL_SCAN_PROBE_MASK(n_probes
);
545 scan_ch
->active_dwell
= cpu_to_le16(active_dwell
);
546 scan_ch
->passive_dwell
= cpu_to_le16(passive_dwell
);
548 /* Set txpower levels to defaults */
549 scan_ch
->dsp_atten
= 110;
551 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
553 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
555 if (band
== IEEE80211_BAND_5GHZ
)
556 scan_ch
->tx_gain
= ((1 << 5) | (3 << 3)) | 3;
558 scan_ch
->tx_gain
= ((1 << 5) | (5 << 3));
560 IWL_DEBUG_SCAN(priv
, "Scanning ch=%d prob=0x%X [%s %d]\n",
561 channel
, le32_to_cpu(scan_ch
->type
),
562 (scan_ch
->type
& SCAN_CHANNEL_TYPE_ACTIVE
) ?
563 "ACTIVE" : "PASSIVE",
564 (scan_ch
->type
& SCAN_CHANNEL_TYPE_ACTIVE
) ?
565 active_dwell
: passive_dwell
);
571 IWL_DEBUG_SCAN(priv
, "total channels to scan %d\n", added
);
576 * iwl_fill_probe_req - fill in all required fields and IE for probe request
579 static u16
iwl_fill_probe_req(struct ieee80211_mgmt
*frame
, const u8
*ta
,
580 const u8
*ies
, int ie_len
, int left
)
585 /* Make sure there is enough space for the probe request,
586 * two mandatory IEs and the data */
591 frame
->frame_control
= cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
);
592 memcpy(frame
->da
, iwl_bcast_addr
, ETH_ALEN
);
593 memcpy(frame
->sa
, ta
, ETH_ALEN
);
594 memcpy(frame
->bssid
, iwl_bcast_addr
, ETH_ALEN
);
600 pos
= &frame
->u
.probe_req
.variable
[0];
602 /* fill in our indirect SSID IE */
606 *pos
++ = WLAN_EID_SSID
;
611 if (WARN_ON(left
< ie_len
))
615 memcpy(pos
, ies
, ie_len
);
622 static int iwlagn_request_scan(struct iwl_priv
*priv
, struct ieee80211_vif
*vif
)
624 struct iwl_host_cmd cmd
= {
625 .id
= REPLY_SCAN_CMD
,
626 .len
= { sizeof(struct iwl_scan_cmd
), },
629 struct iwl_scan_cmd
*scan
;
630 struct iwl_rxon_context
*ctx
= &priv
->contexts
[IWL_RXON_CTX_BSS
];
634 enum ieee80211_band band
;
636 u8 rx_ant
= hw_params(priv
).valid_rx_ant
;
638 bool is_active
= false;
641 u8 scan_tx_antennas
= hw_params(priv
).valid_tx_ant
;
644 lockdep_assert_held(&priv
->mutex
);
647 ctx
= iwl_rxon_ctx_from_vif(vif
);
649 if (!priv
->scan_cmd
) {
650 priv
->scan_cmd
= kmalloc(sizeof(struct iwl_scan_cmd
) +
651 IWL_MAX_SCAN_SIZE
, GFP_KERNEL
);
652 if (!priv
->scan_cmd
) {
654 "fail to allocate memory for scan\n");
658 scan
= priv
->scan_cmd
;
659 memset(scan
, 0, sizeof(struct iwl_scan_cmd
) + IWL_MAX_SCAN_SIZE
);
661 scan
->quiet_plcp_th
= IWL_PLCP_QUIET_THRESH
;
662 scan
->quiet_time
= IWL_ACTIVE_QUIET_TIME
;
664 if (priv
->scan_type
!= IWL_SCAN_ROC
&&
665 iwl_is_any_associated(priv
)) {
668 u32 suspend_time
= 100;
669 u32 scan_suspend_time
= 100;
671 IWL_DEBUG_INFO(priv
, "Scanning while associated...\n");
672 switch (priv
->scan_type
) {
676 case IWL_SCAN_RADIO_RESET
:
679 case IWL_SCAN_NORMAL
:
680 interval
= vif
->bss_conf
.beacon_int
;
684 scan
->suspend_time
= 0;
685 scan
->max_out_time
= cpu_to_le32(200 * 1024);
687 interval
= suspend_time
;
689 extra
= (suspend_time
/ interval
) << 22;
690 scan_suspend_time
= (extra
|
691 ((suspend_time
% interval
) * 1024));
692 scan
->suspend_time
= cpu_to_le32(scan_suspend_time
);
693 IWL_DEBUG_SCAN(priv
, "suspend_time 0x%X beacon interval %d\n",
694 scan_suspend_time
, interval
);
695 } else if (priv
->scan_type
== IWL_SCAN_ROC
) {
696 scan
->suspend_time
= 0;
697 scan
->max_out_time
= 0;
698 scan
->quiet_time
= 0;
699 scan
->quiet_plcp_th
= 0;
702 switch (priv
->scan_type
) {
703 case IWL_SCAN_RADIO_RESET
:
704 IWL_DEBUG_SCAN(priv
, "Start internal passive scan.\n");
706 case IWL_SCAN_NORMAL
:
707 if (priv
->scan_request
->n_ssids
) {
709 IWL_DEBUG_SCAN(priv
, "Kicking off active scan\n");
710 for (i
= 0; i
< priv
->scan_request
->n_ssids
; i
++) {
711 /* always does wildcard anyway */
712 if (!priv
->scan_request
->ssids
[i
].ssid_len
)
714 scan
->direct_scan
[p
].id
= WLAN_EID_SSID
;
715 scan
->direct_scan
[p
].len
=
716 priv
->scan_request
->ssids
[i
].ssid_len
;
717 memcpy(scan
->direct_scan
[p
].ssid
,
718 priv
->scan_request
->ssids
[i
].ssid
,
719 priv
->scan_request
->ssids
[i
].ssid_len
);
725 IWL_DEBUG_SCAN(priv
, "Start passive scan.\n");
728 IWL_DEBUG_SCAN(priv
, "Start ROC scan.\n");
732 scan
->tx_cmd
.tx_flags
= TX_CMD_FLG_SEQ_CTL_MSK
;
733 scan
->tx_cmd
.sta_id
= ctx
->bcast_sta_id
;
734 scan
->tx_cmd
.stop_time
.life_time
= TX_CMD_LIFE_TIME_INFINITE
;
736 switch (priv
->scan_band
) {
737 case IEEE80211_BAND_2GHZ
:
738 scan
->flags
= RXON_FLG_BAND_24G_MSK
| RXON_FLG_AUTO_DETECT_MSK
;
739 chan_mod
= le32_to_cpu(
740 priv
->contexts
[IWL_RXON_CTX_BSS
].active
.flags
&
741 RXON_FLG_CHANNEL_MODE_MSK
)
742 >> RXON_FLG_CHANNEL_MODE_POS
;
743 if ((priv
->scan_request
&& priv
->scan_request
->no_cck
) ||
744 chan_mod
== CHANNEL_MODE_PURE_40
) {
745 rate
= IWL_RATE_6M_PLCP
;
747 rate
= IWL_RATE_1M_PLCP
;
748 rate_flags
= RATE_MCS_CCK_MSK
;
751 * Internal scans are passive, so we can indiscriminately set
752 * the BT ignore flag on 2.4 GHz since it applies to TX only.
754 if (cfg(priv
)->bt_params
&&
755 cfg(priv
)->bt_params
->advanced_bt_coexist
)
756 scan
->tx_cmd
.tx_flags
|= TX_CMD_FLG_IGNORE_BT
;
758 case IEEE80211_BAND_5GHZ
:
759 rate
= IWL_RATE_6M_PLCP
;
762 IWL_WARN(priv
, "Invalid scan band\n");
767 * If active scanning is requested but a certain channel is
768 * marked passive, we can do active scanning if we detect
771 * There is an issue with some firmware versions that triggers
772 * a sysassert on a "good CRC threshold" of zero (== disabled),
773 * on a radar channel even though this means that we should NOT
776 * The "good CRC threshold" is the number of frames that we
777 * need to receive during our dwell time on a channel before
778 * sending out probes -- setting this to a huge value will
779 * mean we never reach it, but at the same time work around
780 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
781 * here instead of IWL_GOOD_CRC_TH_DISABLED.
783 * This was fixed in later versions along with some other
784 * scan changes, and the threshold behaves as a flag in those
787 if (priv
->new_scan_threshold_behaviour
)
788 scan
->good_CRC_th
= is_active
? IWL_GOOD_CRC_TH_DEFAULT
:
789 IWL_GOOD_CRC_TH_DISABLED
;
791 scan
->good_CRC_th
= is_active
? IWL_GOOD_CRC_TH_DEFAULT
:
792 IWL_GOOD_CRC_TH_NEVER
;
794 band
= priv
->scan_band
;
796 if (cfg(priv
)->scan_rx_antennas
[band
])
797 rx_ant
= cfg(priv
)->scan_rx_antennas
[band
];
799 if (band
== IEEE80211_BAND_2GHZ
&&
800 cfg(priv
)->bt_params
&&
801 cfg(priv
)->bt_params
->advanced_bt_coexist
) {
802 /* transmit 2.4 GHz probes only on first antenna */
803 scan_tx_antennas
= first_antenna(scan_tx_antennas
);
806 priv
->scan_tx_ant
[band
] = iwl_toggle_tx_ant(priv
,
807 priv
->scan_tx_ant
[band
],
809 rate_flags
|= iwl_ant_idx_to_flags(priv
->scan_tx_ant
[band
]);
810 scan
->tx_cmd
.rate_n_flags
= iwl_hw_set_rate_n_flags(rate
, rate_flags
);
812 /* In power save mode use one chain, otherwise use all chains */
813 if (test_bit(STATUS_POWER_PMI
, &priv
->shrd
->status
)) {
814 /* rx_ant has been set to all valid chains previously */
815 active_chains
= rx_ant
&
816 ((u8
)(priv
->chain_noise_data
.active_chains
));
818 active_chains
= rx_ant
;
820 IWL_DEBUG_SCAN(priv
, "chain_noise_data.active_chains: %u\n",
821 priv
->chain_noise_data
.active_chains
);
823 rx_ant
= first_antenna(active_chains
);
825 if (cfg(priv
)->bt_params
&&
826 cfg(priv
)->bt_params
->advanced_bt_coexist
&&
827 priv
->bt_full_concurrent
) {
828 /* operated as 1x1 in full concurrency mode */
829 rx_ant
= first_antenna(rx_ant
);
832 /* MIMO is not used here, but value is required */
834 hw_params(priv
).valid_rx_ant
<< RXON_RX_CHAIN_VALID_POS
;
835 rx_chain
|= rx_ant
<< RXON_RX_CHAIN_FORCE_MIMO_SEL_POS
;
836 rx_chain
|= rx_ant
<< RXON_RX_CHAIN_FORCE_SEL_POS
;
837 rx_chain
|= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS
;
838 scan
->rx_chain
= cpu_to_le16(rx_chain
);
839 switch (priv
->scan_type
) {
840 case IWL_SCAN_NORMAL
:
841 cmd_len
= iwl_fill_probe_req(
842 (struct ieee80211_mgmt
*)scan
->data
,
844 priv
->scan_request
->ie
,
845 priv
->scan_request
->ie_len
,
846 IWL_MAX_SCAN_SIZE
- sizeof(*scan
));
848 case IWL_SCAN_RADIO_RESET
:
850 /* use bcast addr, will not be transmitted but must be valid */
851 cmd_len
= iwl_fill_probe_req(
852 (struct ieee80211_mgmt
*)scan
->data
,
853 iwl_bcast_addr
, NULL
, 0,
854 IWL_MAX_SCAN_SIZE
- sizeof(*scan
));
859 scan
->tx_cmd
.len
= cpu_to_le16(cmd_len
);
861 scan
->filter_flags
|= (RXON_FILTER_ACCEPT_GRP_MSK
|
862 RXON_FILTER_BCON_AWARE_MSK
);
864 switch (priv
->scan_type
) {
865 case IWL_SCAN_RADIO_RESET
:
866 scan
->channel_count
=
867 iwl_get_single_channel_for_scan(priv
, vif
, band
,
868 (void *)&scan
->data
[cmd_len
]);
870 case IWL_SCAN_NORMAL
:
871 scan
->channel_count
=
872 iwl_get_channels_for_scan(priv
, vif
, band
,
874 (void *)&scan
->data
[cmd_len
]);
877 struct iwl_scan_channel
*scan_ch
;
881 dwell
= iwl_limit_dwell(priv
, priv
->hw_roc_duration
);
882 n_chan
= DIV_ROUND_UP(priv
->hw_roc_duration
, dwell
);
884 scan
->channel_count
= n_chan
;
886 scan_ch
= (void *)&scan
->data
[cmd_len
];
888 for (i
= 0; i
< n_chan
; i
++) {
889 scan_ch
->type
= SCAN_CHANNEL_TYPE_PASSIVE
;
891 cpu_to_le16(priv
->hw_roc_channel
->hw_value
);
894 dwell
= priv
->hw_roc_duration
- i
* dwell
;
896 scan_ch
->active_dwell
=
897 scan_ch
->passive_dwell
= cpu_to_le16(dwell
);
899 /* Set txpower levels to defaults */
900 scan_ch
->dsp_atten
= 110;
902 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
904 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
906 if (priv
->hw_roc_channel
->band
== IEEE80211_BAND_5GHZ
)
907 scan_ch
->tx_gain
= ((1 << 5) | (3 << 3)) | 3;
909 scan_ch
->tx_gain
= ((1 << 5) | (5 << 3));
918 if (scan
->channel_count
== 0) {
919 IWL_DEBUG_SCAN(priv
, "channel count %d\n", scan
->channel_count
);
923 cmd
.len
[0] += le16_to_cpu(scan
->tx_cmd
.len
) +
924 scan
->channel_count
* sizeof(struct iwl_scan_channel
);
926 cmd
.dataflags
[0] = IWL_HCMD_DFL_NOCOPY
;
927 scan
->len
= cpu_to_le16(cmd
.len
[0]);
929 /* set scan bit here for PAN params */
930 set_bit(STATUS_SCAN_HW
, &priv
->status
);
932 ret
= iwlagn_set_pan_params(priv
);
936 ret
= iwl_dvm_send_cmd(priv
, &cmd
);
938 clear_bit(STATUS_SCAN_HW
, &priv
->status
);
939 iwlagn_set_pan_params(priv
);
945 void iwl_init_scan_params(struct iwl_priv
*priv
)
947 u8 ant_idx
= fls(hw_params(priv
).valid_tx_ant
) - 1;
948 if (!priv
->scan_tx_ant
[IEEE80211_BAND_5GHZ
])
949 priv
->scan_tx_ant
[IEEE80211_BAND_5GHZ
] = ant_idx
;
950 if (!priv
->scan_tx_ant
[IEEE80211_BAND_2GHZ
])
951 priv
->scan_tx_ant
[IEEE80211_BAND_2GHZ
] = ant_idx
;
954 int __must_check
iwl_scan_initiate(struct iwl_priv
*priv
,
955 struct ieee80211_vif
*vif
,
956 enum iwl_scan_type scan_type
,
957 enum ieee80211_band band
)
961 lockdep_assert_held(&priv
->mutex
);
963 cancel_delayed_work(&priv
->scan_check
);
965 if (!iwl_is_ready_rf(priv
)) {
966 IWL_WARN(priv
, "Request scan called when driver not ready.\n");
970 if (test_bit(STATUS_SCAN_HW
, &priv
->status
)) {
972 "Multiple concurrent scan requests in parallel.\n");
976 if (test_bit(STATUS_SCAN_ABORTING
, &priv
->status
)) {
977 IWL_DEBUG_SCAN(priv
, "Scan request while abort pending.\n");
981 IWL_DEBUG_SCAN(priv
, "Starting %sscan...\n",
982 scan_type
== IWL_SCAN_NORMAL
? "" :
983 scan_type
== IWL_SCAN_ROC
? "remain-on-channel " :
986 set_bit(STATUS_SCANNING
, &priv
->status
);
987 priv
->scan_type
= scan_type
;
988 priv
->scan_start
= jiffies
;
989 priv
->scan_band
= band
;
991 ret
= iwlagn_request_scan(priv
, vif
);
993 clear_bit(STATUS_SCANNING
, &priv
->status
);
994 priv
->scan_type
= IWL_SCAN_NORMAL
;
998 queue_delayed_work(priv
->workqueue
, &priv
->scan_check
,
999 IWL_SCAN_CHECK_WATCHDOG
);
1006 * internal short scan, this function should only been called while associated.
1007 * It will reset and tune the radio to prevent possible RF related problem
1009 void iwl_internal_short_hw_scan(struct iwl_priv
*priv
)
1011 queue_work(priv
->workqueue
, &priv
->start_internal_scan
);
1014 static void iwl_bg_start_internal_scan(struct work_struct
*work
)
1016 struct iwl_priv
*priv
=
1017 container_of(work
, struct iwl_priv
, start_internal_scan
);
1019 IWL_DEBUG_SCAN(priv
, "Start internal scan\n");
1021 mutex_lock(&priv
->mutex
);
1023 if (priv
->scan_type
== IWL_SCAN_RADIO_RESET
) {
1024 IWL_DEBUG_SCAN(priv
, "Internal scan already in progress\n");
1028 if (test_bit(STATUS_SCANNING
, &priv
->status
)) {
1029 IWL_DEBUG_SCAN(priv
, "Scan already in progress.\n");
1033 if (iwl_scan_initiate(priv
, NULL
, IWL_SCAN_RADIO_RESET
, priv
->band
))
1034 IWL_DEBUG_SCAN(priv
, "failed to start internal short scan\n");
1036 mutex_unlock(&priv
->mutex
);
1039 static void iwl_bg_scan_check(struct work_struct
*data
)
1041 struct iwl_priv
*priv
=
1042 container_of(data
, struct iwl_priv
, scan_check
.work
);
1044 IWL_DEBUG_SCAN(priv
, "Scan check work\n");
1046 /* Since we are here firmware does not finish scan and
1047 * most likely is in bad shape, so we don't bother to
1048 * send abort command, just force scan complete to mac80211 */
1049 mutex_lock(&priv
->mutex
);
1050 iwl_force_scan_end(priv
);
1051 mutex_unlock(&priv
->mutex
);
1054 static void iwl_bg_abort_scan(struct work_struct
*work
)
1056 struct iwl_priv
*priv
= container_of(work
, struct iwl_priv
, abort_scan
);
1058 IWL_DEBUG_SCAN(priv
, "Abort scan work\n");
1060 /* We keep scan_check work queued in case when firmware will not
1061 * report back scan completed notification */
1062 mutex_lock(&priv
->mutex
);
1063 iwl_scan_cancel_timeout(priv
, 200);
1064 mutex_unlock(&priv
->mutex
);
1067 static void iwl_bg_scan_completed(struct work_struct
*work
)
1069 struct iwl_priv
*priv
=
1070 container_of(work
, struct iwl_priv
, scan_completed
);
1072 mutex_lock(&priv
->mutex
);
1073 iwl_process_scan_complete(priv
);
1074 mutex_unlock(&priv
->mutex
);
1077 void iwl_setup_scan_deferred_work(struct iwl_priv
*priv
)
1079 INIT_WORK(&priv
->scan_completed
, iwl_bg_scan_completed
);
1080 INIT_WORK(&priv
->abort_scan
, iwl_bg_abort_scan
);
1081 INIT_WORK(&priv
->start_internal_scan
, iwl_bg_start_internal_scan
);
1082 INIT_DELAYED_WORK(&priv
->scan_check
, iwl_bg_scan_check
);
1085 void iwl_cancel_scan_deferred_work(struct iwl_priv
*priv
)
1087 cancel_work_sync(&priv
->start_internal_scan
);
1088 cancel_work_sync(&priv
->abort_scan
);
1089 cancel_work_sync(&priv
->scan_completed
);
1091 if (cancel_delayed_work_sync(&priv
->scan_check
)) {
1092 mutex_lock(&priv
->mutex
);
1093 iwl_force_scan_end(priv
);
1094 mutex_unlock(&priv
->mutex
);