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