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[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
6 *
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.
10 *
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.
15 *
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,
19 * USA
20 *
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
23 *
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>
32
33 #include "iwl-eeprom.h"
34 #include "iwl-dev.h"
35 #include "iwl-core.h"
36 #include "iwl-io.h"
37 #include "iwl-helpers.h"
38 #include "iwl-agn.h"
39 #include "iwl-trans.h"
40
41 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
42 * sending probe req. This should be set long enough to hear probe responses
43 * from more than one AP. */
44 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
45 #define IWL_ACTIVE_DWELL_TIME_52 (20)
46
47 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
48 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
49
50 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
51 * Must be set longer than active dwell time.
52 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
53 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
54 #define IWL_PASSIVE_DWELL_TIME_52 (10)
55 #define IWL_PASSIVE_DWELL_BASE (100)
56 #define IWL_CHANNEL_TUNE_TIME 5
57
58 static int iwl_send_scan_abort(struct iwl_priv *priv)
59 {
60 int ret;
61 struct iwl_rx_packet *pkt;
62 struct iwl_host_cmd cmd = {
63 .id = REPLY_SCAN_ABORT_CMD,
64 .flags = CMD_SYNC | CMD_WANT_SKB,
65 };
66
67 /* Exit instantly with error when device is not ready
68 * to receive scan abort command or it does not perform
69 * hardware scan currently */
70 if (!test_bit(STATUS_READY, &priv->shrd->status) ||
71 !test_bit(STATUS_GEO_CONFIGURED, &priv->shrd->status) ||
72 !test_bit(STATUS_SCAN_HW, &priv->shrd->status) ||
73 test_bit(STATUS_FW_ERROR, &priv->shrd->status) ||
74 test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
75 return -EIO;
76
77 ret = iwl_trans_send_cmd(trans(priv), &cmd);
78 if (ret)
79 return ret;
80
81 pkt = (struct iwl_rx_packet *)cmd.reply_page;
82 if (pkt->u.status != CAN_ABORT_STATUS) {
83 /* The scan abort will return 1 for success or
84 * 2 for "failure". A failure condition can be
85 * due to simply not being in an active scan which
86 * can occur if we send the scan abort before we
87 * the microcode has notified us that a scan is
88 * completed. */
89 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", pkt->u.status);
90 ret = -EIO;
91 }
92
93 iwl_free_pages(priv->shrd, cmd.reply_page);
94 return ret;
95 }
96
97 static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
98 {
99 /* check if scan was requested from mac80211 */
100 if (priv->scan_request) {
101 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
102 ieee80211_scan_completed(priv->hw, aborted);
103 }
104
105 if (priv->scan_type == IWL_SCAN_ROC) {
106 ieee80211_remain_on_channel_expired(priv->hw);
107 priv->hw_roc_channel = NULL;
108 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
109 }
110
111 priv->scan_type = IWL_SCAN_NORMAL;
112 priv->scan_vif = NULL;
113 priv->scan_request = NULL;
114 }
115
116 static void iwl_process_scan_complete(struct iwl_priv *priv)
117 {
118 bool aborted;
119
120 lockdep_assert_held(&priv->shrd->mutex);
121
122 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status))
123 return;
124
125 IWL_DEBUG_SCAN(priv, "Completed scan.\n");
126
127 cancel_delayed_work(&priv->scan_check);
128
129 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
130 if (aborted)
131 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
132
133 if (!test_and_clear_bit(STATUS_SCANNING, &priv->shrd->status)) {
134 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
135 goto out_settings;
136 }
137
138 if (priv->scan_type == IWL_SCAN_ROC) {
139 ieee80211_remain_on_channel_expired(priv->hw);
140 priv->hw_roc_channel = NULL;
141 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
142 }
143
144 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
145 int err;
146
147 /* Check if mac80211 requested scan during our internal scan */
148 if (priv->scan_request == NULL)
149 goto out_complete;
150
151 /* If so request a new scan */
152 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
153 priv->scan_request->channels[0]->band);
154 if (err) {
155 IWL_DEBUG_SCAN(priv,
156 "failed to initiate pending scan: %d\n", err);
157 aborted = true;
158 goto out_complete;
159 }
160
161 return;
162 }
163
164 out_complete:
165 iwl_complete_scan(priv, aborted);
166
167 out_settings:
168 /* Can we still talk to firmware ? */
169 if (!iwl_is_ready_rf(priv->shrd))
170 return;
171
172 iwlagn_post_scan(priv);
173 }
174
175 void iwl_force_scan_end(struct iwl_priv *priv)
176 {
177 lockdep_assert_held(&priv->shrd->mutex);
178
179 if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) {
180 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
181 return;
182 }
183
184 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
185 clear_bit(STATUS_SCANNING, &priv->shrd->status);
186 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
187 clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
188 clear_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status);
189 iwl_complete_scan(priv, true);
190 }
191
192 static void iwl_do_scan_abort(struct iwl_priv *priv)
193 {
194 int ret;
195
196 lockdep_assert_held(&priv->shrd->mutex);
197
198 if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) {
199 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
200 return;
201 }
202
203 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
204 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
205 return;
206 }
207
208 ret = iwl_send_scan_abort(priv);
209 if (ret) {
210 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
211 iwl_force_scan_end(priv);
212 } else
213 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
214 }
215
216 /**
217 * iwl_scan_cancel - Cancel any currently executing HW scan
218 */
219 int iwl_scan_cancel(struct iwl_priv *priv)
220 {
221 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
222 queue_work(priv->shrd->workqueue, &priv->abort_scan);
223 return 0;
224 }
225
226 /**
227 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
228 * @ms: amount of time to wait (in milliseconds) for scan to abort
229 *
230 */
231 void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
232 {
233 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
234
235 lockdep_assert_held(&priv->shrd->mutex);
236
237 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
238
239 iwl_do_scan_abort(priv);
240
241 while (time_before_eq(jiffies, timeout)) {
242 if (!test_bit(STATUS_SCAN_HW, &priv->shrd->status))
243 goto finished;
244 msleep(20);
245 }
246
247 return;
248
249 finished:
250 /*
251 * Now STATUS_SCAN_HW is clear. This means that the
252 * device finished, but the background work is going
253 * to execute at best as soon as we release the mutex.
254 * Since we need to be able to issue a new scan right
255 * after this function returns, run the complete here.
256 * The STATUS_SCAN_COMPLETE bit will then be cleared
257 * and prevent the background work from "completing"
258 * a possible new scan.
259 */
260 iwl_process_scan_complete(priv);
261 }
262
263 /* Service response to REPLY_SCAN_CMD (0x80) */
264 static int iwl_rx_reply_scan(struct iwl_priv *priv,
265 struct iwl_rx_mem_buffer *rxb,
266 struct iwl_device_cmd *cmd)
267 {
268 #ifdef CONFIG_IWLWIFI_DEBUG
269 struct iwl_rx_packet *pkt = rxb_addr(rxb);
270 struct iwl_scanreq_notification *notif =
271 (struct iwl_scanreq_notification *)pkt->u.raw;
272
273 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
274 #endif
275 return 0;
276 }
277
278 /* Service SCAN_START_NOTIFICATION (0x82) */
279 static int iwl_rx_scan_start_notif(struct iwl_priv *priv,
280 struct iwl_rx_mem_buffer *rxb,
281 struct iwl_device_cmd *cmd)
282 {
283 struct iwl_rx_packet *pkt = rxb_addr(rxb);
284 struct iwl_scanstart_notification *notif =
285 (struct iwl_scanstart_notification *)pkt->u.raw;
286 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
287 IWL_DEBUG_SCAN(priv, "Scan start: "
288 "%d [802.11%s] "
289 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
290 notif->channel,
291 notif->band ? "bg" : "a",
292 le32_to_cpu(notif->tsf_high),
293 le32_to_cpu(notif->tsf_low),
294 notif->status, notif->beacon_timer);
295
296 if (priv->scan_type == IWL_SCAN_ROC &&
297 !priv->hw_roc_start_notified) {
298 ieee80211_ready_on_channel(priv->hw);
299 priv->hw_roc_start_notified = true;
300 }
301
302 return 0;
303 }
304
305 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
306 static int iwl_rx_scan_results_notif(struct iwl_priv *priv,
307 struct iwl_rx_mem_buffer *rxb,
308 struct iwl_device_cmd *cmd)
309 {
310 #ifdef CONFIG_IWLWIFI_DEBUG
311 struct iwl_rx_packet *pkt = rxb_addr(rxb);
312 struct iwl_scanresults_notification *notif =
313 (struct iwl_scanresults_notification *)pkt->u.raw;
314
315 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
316 "%d [802.11%s] "
317 "probe status: %u:%u "
318 "(TSF: 0x%08X:%08X) - %d "
319 "elapsed=%lu usec\n",
320 notif->channel,
321 notif->band ? "bg" : "a",
322 notif->probe_status, notif->num_probe_not_sent,
323 le32_to_cpu(notif->tsf_high),
324 le32_to_cpu(notif->tsf_low),
325 le32_to_cpu(notif->statistics[0]),
326 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
327 #endif
328 return 0;
329 }
330
331 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
332 static int iwl_rx_scan_complete_notif(struct iwl_priv *priv,
333 struct iwl_rx_mem_buffer *rxb,
334 struct iwl_device_cmd *cmd)
335 {
336 struct iwl_rx_packet *pkt = rxb_addr(rxb);
337 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
338
339 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
340 scan_notif->scanned_channels,
341 scan_notif->tsf_low,
342 scan_notif->tsf_high, scan_notif->status);
343
344 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
345 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
346 jiffies_to_msecs(jiffies - priv->scan_start));
347
348 /*
349 * When aborting, we run the scan completed background work inline
350 * and the background work must then do nothing. The SCAN_COMPLETE
351 * bit helps implement that logic and thus needs to be set before
352 * queueing the work. Also, since the scan abort waits for SCAN_HW
353 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
354 * to avoid a race there.
355 */
356 set_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status);
357 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
358 queue_work(priv->shrd->workqueue, &priv->scan_completed);
359
360 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
361 iwl_advanced_bt_coexist(priv) &&
362 priv->bt_status != scan_notif->bt_status) {
363 if (scan_notif->bt_status) {
364 /* BT on */
365 if (!priv->bt_ch_announce)
366 priv->bt_traffic_load =
367 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
368 /*
369 * otherwise, no traffic load information provided
370 * no changes made
371 */
372 } else {
373 /* BT off */
374 priv->bt_traffic_load =
375 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
376 }
377 priv->bt_status = scan_notif->bt_status;
378 queue_work(priv->shrd->workqueue,
379 &priv->bt_traffic_change_work);
380 }
381 return 0;
382 }
383
384 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
385 {
386 /* scan handlers */
387 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
388 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
389 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
390 iwl_rx_scan_results_notif;
391 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
392 iwl_rx_scan_complete_notif;
393 }
394
395 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
396 enum ieee80211_band band, u8 n_probes)
397 {
398 if (band == IEEE80211_BAND_5GHZ)
399 return IWL_ACTIVE_DWELL_TIME_52 +
400 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
401 else
402 return IWL_ACTIVE_DWELL_TIME_24 +
403 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
404 }
405
406 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
407 {
408 struct iwl_rxon_context *ctx;
409
410 /*
411 * If we're associated, we clamp the dwell time 98%
412 * of the smallest beacon interval (minus 2 * channel
413 * tune time)
414 */
415 for_each_context(priv, ctx) {
416 u16 value;
417
418 if (!iwl_is_associated_ctx(ctx))
419 continue;
420 value = ctx->beacon_int;
421 if (!value)
422 value = IWL_PASSIVE_DWELL_BASE;
423 value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
424 dwell_time = min(value, dwell_time);
425 }
426
427 return dwell_time;
428 }
429
430 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
431 enum ieee80211_band band)
432 {
433 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
434 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
435 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
436
437 return iwl_limit_dwell(priv, passive);
438 }
439
440 static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
441 struct ieee80211_vif *vif,
442 enum ieee80211_band band,
443 struct iwl_scan_channel *scan_ch)
444 {
445 const struct ieee80211_supported_band *sband;
446 u16 passive_dwell = 0;
447 u16 active_dwell = 0;
448 int added = 0;
449 u16 channel = 0;
450
451 sband = iwl_get_hw_mode(priv, band);
452 if (!sband) {
453 IWL_ERR(priv, "invalid band\n");
454 return added;
455 }
456
457 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
458 passive_dwell = iwl_get_passive_dwell_time(priv, band);
459
460 if (passive_dwell <= active_dwell)
461 passive_dwell = active_dwell + 1;
462
463 channel = iwl_get_single_channel_number(priv, band);
464 if (channel) {
465 scan_ch->channel = cpu_to_le16(channel);
466 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
467 scan_ch->active_dwell = cpu_to_le16(active_dwell);
468 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
469 /* Set txpower levels to defaults */
470 scan_ch->dsp_atten = 110;
471 if (band == IEEE80211_BAND_5GHZ)
472 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
473 else
474 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
475 added++;
476 } else
477 IWL_ERR(priv, "no valid channel found\n");
478 return added;
479 }
480
481 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
482 struct ieee80211_vif *vif,
483 enum ieee80211_band band,
484 u8 is_active, u8 n_probes,
485 struct iwl_scan_channel *scan_ch)
486 {
487 struct ieee80211_channel *chan;
488 const struct ieee80211_supported_band *sband;
489 const struct iwl_channel_info *ch_info;
490 u16 passive_dwell = 0;
491 u16 active_dwell = 0;
492 int added, i;
493 u16 channel;
494
495 sband = iwl_get_hw_mode(priv, band);
496 if (!sband)
497 return 0;
498
499 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
500 passive_dwell = iwl_get_passive_dwell_time(priv, band);
501
502 if (passive_dwell <= active_dwell)
503 passive_dwell = active_dwell + 1;
504
505 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
506 chan = priv->scan_request->channels[i];
507
508 if (chan->band != band)
509 continue;
510
511 channel = chan->hw_value;
512 scan_ch->channel = cpu_to_le16(channel);
513
514 ch_info = iwl_get_channel_info(priv, band, channel);
515 if (!is_channel_valid(ch_info)) {
516 IWL_DEBUG_SCAN(priv,
517 "Channel %d is INVALID for this band.\n",
518 channel);
519 continue;
520 }
521
522 if (!is_active || is_channel_passive(ch_info) ||
523 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
524 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
525 else
526 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
527
528 if (n_probes)
529 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
530
531 scan_ch->active_dwell = cpu_to_le16(active_dwell);
532 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
533
534 /* Set txpower levels to defaults */
535 scan_ch->dsp_atten = 110;
536
537 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
538 * power level:
539 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
540 */
541 if (band == IEEE80211_BAND_5GHZ)
542 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
543 else
544 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
545
546 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
547 channel, le32_to_cpu(scan_ch->type),
548 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
549 "ACTIVE" : "PASSIVE",
550 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
551 active_dwell : passive_dwell);
552
553 scan_ch++;
554 added++;
555 }
556
557 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
558 return added;
559 }
560
561 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
562 {
563 struct iwl_host_cmd cmd = {
564 .id = REPLY_SCAN_CMD,
565 .len = { sizeof(struct iwl_scan_cmd), },
566 .flags = CMD_SYNC,
567 };
568 struct iwl_scan_cmd *scan;
569 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
570 u32 rate_flags = 0;
571 u16 cmd_len;
572 u16 rx_chain = 0;
573 enum ieee80211_band band;
574 u8 n_probes = 0;
575 u8 rx_ant = hw_params(priv).valid_rx_ant;
576 u8 rate;
577 bool is_active = false;
578 int chan_mod;
579 u8 active_chains;
580 u8 scan_tx_antennas = hw_params(priv).valid_tx_ant;
581 int ret;
582
583 lockdep_assert_held(&priv->shrd->mutex);
584
585 if (vif)
586 ctx = iwl_rxon_ctx_from_vif(vif);
587
588 if (!priv->scan_cmd) {
589 priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) +
590 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
591 if (!priv->scan_cmd) {
592 IWL_DEBUG_SCAN(priv,
593 "fail to allocate memory for scan\n");
594 return -ENOMEM;
595 }
596 }
597 scan = priv->scan_cmd;
598 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
599
600 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
601 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
602
603 if (priv->scan_type != IWL_SCAN_ROC &&
604 iwl_is_any_associated(priv)) {
605 u16 interval = 0;
606 u32 extra;
607 u32 suspend_time = 100;
608 u32 scan_suspend_time = 100;
609
610 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
611 switch (priv->scan_type) {
612 case IWL_SCAN_ROC:
613 WARN_ON(1);
614 break;
615 case IWL_SCAN_RADIO_RESET:
616 interval = 0;
617 break;
618 case IWL_SCAN_NORMAL:
619 interval = vif->bss_conf.beacon_int;
620 break;
621 }
622
623 scan->suspend_time = 0;
624 scan->max_out_time = cpu_to_le32(200 * 1024);
625 if (!interval)
626 interval = suspend_time;
627
628 extra = (suspend_time / interval) << 22;
629 scan_suspend_time = (extra |
630 ((suspend_time % interval) * 1024));
631 scan->suspend_time = cpu_to_le32(scan_suspend_time);
632 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
633 scan_suspend_time, interval);
634 } else if (priv->scan_type == IWL_SCAN_ROC) {
635 scan->suspend_time = 0;
636 scan->max_out_time = 0;
637 scan->quiet_time = 0;
638 scan->quiet_plcp_th = 0;
639 }
640
641 switch (priv->scan_type) {
642 case IWL_SCAN_RADIO_RESET:
643 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
644 break;
645 case IWL_SCAN_NORMAL:
646 if (priv->scan_request->n_ssids) {
647 int i, p = 0;
648 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
649 for (i = 0; i < priv->scan_request->n_ssids; i++) {
650 /* always does wildcard anyway */
651 if (!priv->scan_request->ssids[i].ssid_len)
652 continue;
653 scan->direct_scan[p].id = WLAN_EID_SSID;
654 scan->direct_scan[p].len =
655 priv->scan_request->ssids[i].ssid_len;
656 memcpy(scan->direct_scan[p].ssid,
657 priv->scan_request->ssids[i].ssid,
658 priv->scan_request->ssids[i].ssid_len);
659 n_probes++;
660 p++;
661 }
662 is_active = true;
663 } else
664 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
665 break;
666 case IWL_SCAN_ROC:
667 IWL_DEBUG_SCAN(priv, "Start ROC scan.\n");
668 break;
669 }
670
671 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
672 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
673 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
674
675 switch (priv->scan_band) {
676 case IEEE80211_BAND_2GHZ:
677 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
678 chan_mod = le32_to_cpu(
679 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
680 RXON_FLG_CHANNEL_MODE_MSK)
681 >> RXON_FLG_CHANNEL_MODE_POS;
682 if (chan_mod == CHANNEL_MODE_PURE_40) {
683 rate = IWL_RATE_6M_PLCP;
684 } else {
685 rate = IWL_RATE_1M_PLCP;
686 rate_flags = RATE_MCS_CCK_MSK;
687 }
688 /*
689 * Internal scans are passive, so we can indiscriminately set
690 * the BT ignore flag on 2.4 GHz since it applies to TX only.
691 */
692 if (priv->cfg->bt_params &&
693 priv->cfg->bt_params->advanced_bt_coexist)
694 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
695 break;
696 case IEEE80211_BAND_5GHZ:
697 rate = IWL_RATE_6M_PLCP;
698 break;
699 default:
700 IWL_WARN(priv, "Invalid scan band\n");
701 return -EIO;
702 }
703
704 /*
705 * If active scanning is requested but a certain channel is
706 * marked passive, we can do active scanning if we detect
707 * transmissions.
708 *
709 * There is an issue with some firmware versions that triggers
710 * a sysassert on a "good CRC threshold" of zero (== disabled),
711 * on a radar channel even though this means that we should NOT
712 * send probes.
713 *
714 * The "good CRC threshold" is the number of frames that we
715 * need to receive during our dwell time on a channel before
716 * sending out probes -- setting this to a huge value will
717 * mean we never reach it, but at the same time work around
718 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
719 * here instead of IWL_GOOD_CRC_TH_DISABLED.
720 *
721 * This was fixed in later versions along with some other
722 * scan changes, and the threshold behaves as a flag in those
723 * versions.
724 */
725 if (priv->new_scan_threshold_behaviour)
726 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
727 IWL_GOOD_CRC_TH_DISABLED;
728 else
729 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
730 IWL_GOOD_CRC_TH_NEVER;
731
732 band = priv->scan_band;
733
734 if (priv->cfg->scan_rx_antennas[band])
735 rx_ant = priv->cfg->scan_rx_antennas[band];
736
737 if (band == IEEE80211_BAND_2GHZ &&
738 priv->cfg->bt_params &&
739 priv->cfg->bt_params->advanced_bt_coexist) {
740 /* transmit 2.4 GHz probes only on first antenna */
741 scan_tx_antennas = first_antenna(scan_tx_antennas);
742 }
743
744 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
745 priv->scan_tx_ant[band],
746 scan_tx_antennas);
747 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
748 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
749
750 /* In power save mode use one chain, otherwise use all chains */
751 if (test_bit(STATUS_POWER_PMI, &priv->shrd->status)) {
752 /* rx_ant has been set to all valid chains previously */
753 active_chains = rx_ant &
754 ((u8)(priv->chain_noise_data.active_chains));
755 if (!active_chains)
756 active_chains = rx_ant;
757
758 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
759 priv->chain_noise_data.active_chains);
760
761 rx_ant = first_antenna(active_chains);
762 }
763 if (priv->cfg->bt_params &&
764 priv->cfg->bt_params->advanced_bt_coexist &&
765 priv->bt_full_concurrent) {
766 /* operated as 1x1 in full concurrency mode */
767 rx_ant = first_antenna(rx_ant);
768 }
769
770 /* MIMO is not used here, but value is required */
771 rx_chain |=
772 hw_params(priv).valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
773 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
774 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
775 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
776 scan->rx_chain = cpu_to_le16(rx_chain);
777 switch (priv->scan_type) {
778 case IWL_SCAN_NORMAL:
779 cmd_len = iwl_fill_probe_req(priv,
780 (struct ieee80211_mgmt *)scan->data,
781 vif->addr,
782 priv->scan_request->ie,
783 priv->scan_request->ie_len,
784 IWL_MAX_SCAN_SIZE - sizeof(*scan));
785 break;
786 case IWL_SCAN_RADIO_RESET:
787 case IWL_SCAN_ROC:
788 /* use bcast addr, will not be transmitted but must be valid */
789 cmd_len = iwl_fill_probe_req(priv,
790 (struct ieee80211_mgmt *)scan->data,
791 iwl_bcast_addr, NULL, 0,
792 IWL_MAX_SCAN_SIZE - sizeof(*scan));
793 break;
794 default:
795 BUG();
796 }
797 scan->tx_cmd.len = cpu_to_le16(cmd_len);
798
799 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
800 RXON_FILTER_BCON_AWARE_MSK);
801
802 switch (priv->scan_type) {
803 case IWL_SCAN_RADIO_RESET:
804 scan->channel_count =
805 iwl_get_single_channel_for_scan(priv, vif, band,
806 (void *)&scan->data[cmd_len]);
807 break;
808 case IWL_SCAN_NORMAL:
809 scan->channel_count =
810 iwl_get_channels_for_scan(priv, vif, band,
811 is_active, n_probes,
812 (void *)&scan->data[cmd_len]);
813 break;
814 case IWL_SCAN_ROC: {
815 struct iwl_scan_channel *scan_ch;
816 int n_chan, i;
817 u16 dwell;
818
819 dwell = iwl_limit_dwell(priv, priv->hw_roc_duration);
820 n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell);
821
822 scan->channel_count = n_chan;
823
824 scan_ch = (void *)&scan->data[cmd_len];
825
826 for (i = 0; i < n_chan; i++) {
827 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
828 scan_ch->channel =
829 cpu_to_le16(priv->hw_roc_channel->hw_value);
830
831 if (i == n_chan - 1)
832 dwell = priv->hw_roc_duration - i * dwell;
833
834 scan_ch->active_dwell =
835 scan_ch->passive_dwell = cpu_to_le16(dwell);
836
837 /* Set txpower levels to defaults */
838 scan_ch->dsp_atten = 110;
839
840 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
841 * power level:
842 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
843 */
844 if (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ)
845 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
846 else
847 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
848
849 scan_ch++;
850 }
851 }
852
853 break;
854 }
855
856 if (scan->channel_count == 0) {
857 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
858 return -EIO;
859 }
860
861 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
862 scan->channel_count * sizeof(struct iwl_scan_channel);
863 cmd.data[0] = scan;
864 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
865 scan->len = cpu_to_le16(cmd.len[0]);
866
867 /* set scan bit here for PAN params */
868 set_bit(STATUS_SCAN_HW, &priv->shrd->status);
869
870 ret = iwlagn_set_pan_params(priv);
871 if (ret)
872 return ret;
873
874 ret = iwl_trans_send_cmd(trans(priv), &cmd);
875 if (ret) {
876 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
877 iwlagn_set_pan_params(priv);
878 }
879
880 return ret;
881 }
882
883 void iwl_init_scan_params(struct iwl_priv *priv)
884 {
885 u8 ant_idx = fls(hw_params(priv).valid_tx_ant) - 1;
886 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
887 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
888 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
889 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
890 }
891
892 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
893 struct ieee80211_vif *vif,
894 enum iwl_scan_type scan_type,
895 enum ieee80211_band band)
896 {
897 int ret;
898
899 lockdep_assert_held(&priv->shrd->mutex);
900
901 cancel_delayed_work(&priv->scan_check);
902
903 if (!iwl_is_ready_rf(priv->shrd)) {
904 IWL_WARN(priv, "Request scan called when driver not ready.\n");
905 return -EIO;
906 }
907
908 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
909 IWL_DEBUG_SCAN(priv,
910 "Multiple concurrent scan requests in parallel.\n");
911 return -EBUSY;
912 }
913
914 if (test_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
915 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
916 return -EBUSY;
917 }
918
919 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
920 scan_type == IWL_SCAN_NORMAL ? "" :
921 scan_type == IWL_SCAN_ROC ? "remain-on-channel " :
922 "internal short ");
923
924 set_bit(STATUS_SCANNING, &priv->shrd->status);
925 priv->scan_type = scan_type;
926 priv->scan_start = jiffies;
927 priv->scan_band = band;
928
929 ret = iwlagn_request_scan(priv, vif);
930 if (ret) {
931 clear_bit(STATUS_SCANNING, &priv->shrd->status);
932 priv->scan_type = IWL_SCAN_NORMAL;
933 return ret;
934 }
935
936 queue_delayed_work(priv->shrd->workqueue, &priv->scan_check,
937 IWL_SCAN_CHECK_WATCHDOG);
938
939 return 0;
940 }
941
942 int iwlagn_mac_hw_scan(struct ieee80211_hw *hw,
943 struct ieee80211_vif *vif,
944 struct cfg80211_scan_request *req)
945 {
946 struct iwl_priv *priv = hw->priv;
947 int ret;
948
949 IWL_DEBUG_MAC80211(priv, "enter\n");
950
951 if (req->n_channels == 0)
952 return -EINVAL;
953
954 mutex_lock(&priv->shrd->mutex);
955
956 /*
957 * If an internal scan is in progress, just set
958 * up the scan_request as per above.
959 */
960 if (priv->scan_type != IWL_SCAN_NORMAL) {
961 IWL_DEBUG_SCAN(priv,
962 "SCAN request during internal scan - defer\n");
963 priv->scan_request = req;
964 priv->scan_vif = vif;
965 ret = 0;
966 } else {
967 priv->scan_request = req;
968 priv->scan_vif = vif;
969 /*
970 * mac80211 will only ask for one band at a time
971 * so using channels[0] here is ok
972 */
973 ret = iwl_scan_initiate(priv, vif, IWL_SCAN_NORMAL,
974 req->channels[0]->band);
975 if (ret) {
976 priv->scan_request = NULL;
977 priv->scan_vif = NULL;
978 }
979 }
980
981 IWL_DEBUG_MAC80211(priv, "leave\n");
982
983 mutex_unlock(&priv->shrd->mutex);
984
985 return ret;
986 }
987
988 /*
989 * internal short scan, this function should only been called while associated.
990 * It will reset and tune the radio to prevent possible RF related problem
991 */
992 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
993 {
994 queue_work(priv->shrd->workqueue, &priv->start_internal_scan);
995 }
996
997 static void iwl_bg_start_internal_scan(struct work_struct *work)
998 {
999 struct iwl_priv *priv =
1000 container_of(work, struct iwl_priv, start_internal_scan);
1001
1002 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
1003
1004 mutex_lock(&priv->shrd->mutex);
1005
1006 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
1007 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
1008 goto unlock;
1009 }
1010
1011 if (test_bit(STATUS_SCANNING, &priv->shrd->status)) {
1012 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
1013 goto unlock;
1014 }
1015
1016 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
1017 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
1018 unlock:
1019 mutex_unlock(&priv->shrd->mutex);
1020 }
1021
1022 static void iwl_bg_scan_check(struct work_struct *data)
1023 {
1024 struct iwl_priv *priv =
1025 container_of(data, struct iwl_priv, scan_check.work);
1026
1027 IWL_DEBUG_SCAN(priv, "Scan check work\n");
1028
1029 /* Since we are here firmware does not finish scan and
1030 * most likely is in bad shape, so we don't bother to
1031 * send abort command, just force scan complete to mac80211 */
1032 mutex_lock(&priv->shrd->mutex);
1033 iwl_force_scan_end(priv);
1034 mutex_unlock(&priv->shrd->mutex);
1035 }
1036
1037 /**
1038 * iwl_fill_probe_req - fill in all required fields and IE for probe request
1039 */
1040
1041 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
1042 const u8 *ta, const u8 *ies, int ie_len, int left)
1043 {
1044 int len = 0;
1045 u8 *pos = NULL;
1046
1047 /* Make sure there is enough space for the probe request,
1048 * two mandatory IEs and the data */
1049 left -= 24;
1050 if (left < 0)
1051 return 0;
1052
1053 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
1054 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
1055 memcpy(frame->sa, ta, ETH_ALEN);
1056 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
1057 frame->seq_ctrl = 0;
1058
1059 len += 24;
1060
1061 /* ...next IE... */
1062 pos = &frame->u.probe_req.variable[0];
1063
1064 /* fill in our indirect SSID IE */
1065 left -= 2;
1066 if (left < 0)
1067 return 0;
1068 *pos++ = WLAN_EID_SSID;
1069 *pos++ = 0;
1070
1071 len += 2;
1072
1073 if (WARN_ON(left < ie_len))
1074 return len;
1075
1076 if (ies && ie_len) {
1077 memcpy(pos, ies, ie_len);
1078 len += ie_len;
1079 }
1080
1081 return (u16)len;
1082 }
1083
1084 static void iwl_bg_abort_scan(struct work_struct *work)
1085 {
1086 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1087
1088 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1089
1090 /* We keep scan_check work queued in case when firmware will not
1091 * report back scan completed notification */
1092 mutex_lock(&priv->shrd->mutex);
1093 iwl_scan_cancel_timeout(priv, 200);
1094 mutex_unlock(&priv->shrd->mutex);
1095 }
1096
1097 static void iwl_bg_scan_completed(struct work_struct *work)
1098 {
1099 struct iwl_priv *priv =
1100 container_of(work, struct iwl_priv, scan_completed);
1101
1102 mutex_lock(&priv->shrd->mutex);
1103 iwl_process_scan_complete(priv);
1104 mutex_unlock(&priv->shrd->mutex);
1105 }
1106
1107 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1108 {
1109 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
1110 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
1111 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
1112 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1113 }
1114
1115 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1116 {
1117 cancel_work_sync(&priv->start_internal_scan);
1118 cancel_work_sync(&priv->abort_scan);
1119 cancel_work_sync(&priv->scan_completed);
1120
1121 if (cancel_delayed_work_sync(&priv->scan_check)) {
1122 mutex_lock(&priv->shrd->mutex);
1123 iwl_force_scan_end(priv);
1124 mutex_unlock(&priv->shrd->mutex);
1125 }
1126 }
Linux kernel - Deliverables
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