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iwlwifi: move packet to transport
[linux-2.6/btrfs-unstable.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
blob91a14577b8a8cb78a0b8f643155aabc1183c54b5
1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2012 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_host_cmd cmd = {
61 .id = REPLY_SCAN_ABORT_CMD,
62 .flags = CMD_SYNC | CMD_WANT_SKB,
63 };
64 __le32 *status;
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 return -EIO;
74
75 ret = iwl_dvm_send_cmd(priv, &cmd);
76 if (ret)
77 return ret;
78
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
86 * completed. */
87 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n",
88 le32_to_cpu(*status));
89 ret = -EIO;
90 }
91
92 iwl_free_resp(&cmd);
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->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->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->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->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->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_cmd_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 = (void *)pkt->data;
270
271 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
272 #endif
273 return 0;
274 }
275
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)
280 {
281 struct iwl_rx_packet *pkt = rxb_addr(rxb);
282 struct iwl_scanstart_notification *notif = (void *)pkt->data;
283
284 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
285 IWL_DEBUG_SCAN(priv, "Scan start: "
286 "%d [802.11%s] "
287 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
288 notif->channel,
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);
293
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;
298 }
299
300 return 0;
301 }
302
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)
307 {
308 #ifdef CONFIG_IWLWIFI_DEBUG
309 struct iwl_rx_packet *pkt = rxb_addr(rxb);
310 struct iwl_scanresults_notification *notif = (void *)pkt->data;
311
312 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
313 "%d [802.11%s] "
314 "probe status: %u:%u "
315 "(TSF: 0x%08X:%08X) - %d "
316 "elapsed=%lu usec\n",
317 notif->channel,
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);
324 #endif
325 return 0;
326 }
327
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)
332 {
333 struct iwl_rx_packet *pkt = rxb_addr(rxb);
334 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data;
335
336 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
337 scan_notif->scanned_channels,
338 scan_notif->tsf_low,
339 scan_notif->tsf_high, scan_notif->status);
340
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));
344
345 /*
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.
352 */
353 set_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status);
354 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
355 queue_work(priv->workqueue, &priv->scan_completed);
356
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) {
361 /* BT on */
362 if (!priv->bt_ch_announce)
363 priv->bt_traffic_load =
364 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
365 /*
366 * otherwise, no traffic load information provided
367 * no changes made
368 */
369 } else {
370 /* BT off */
371 priv->bt_traffic_load =
372 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
373 }
374 priv->bt_status = scan_notif->bt_status;
375 queue_work(priv->workqueue,
376 &priv->bt_traffic_change_work);
377 }
378 return 0;
379 }
380
381 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
382 {
383 /* scan handlers */
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;
390 }
391
392 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
393 enum ieee80211_band band, u8 n_probes)
394 {
395 if (band == IEEE80211_BAND_5GHZ)
396 return IWL_ACTIVE_DWELL_TIME_52 +
397 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
398 else
399 return IWL_ACTIVE_DWELL_TIME_24 +
400 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
401 }
402
403 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
404 {
405 struct iwl_rxon_context *ctx;
406
407 /*
408 * If we're associated, we clamp the dwell time 98%
409 * of the smallest beacon interval (minus 2 * channel
410 * tune time)
411 */
412 for_each_context(priv, ctx) {
413 u16 value;
414
415 switch (ctx->staging.dev_type) {
416 case RXON_DEV_TYPE_P2P:
417 /* no timing constraints */
418 continue;
419 case RXON_DEV_TYPE_ESS:
420 default:
421 /* timing constraints if associated */
422 if (!iwl_is_associated_ctx(ctx))
423 continue;
424 break;
425 case RXON_DEV_TYPE_CP:
426 case RXON_DEV_TYPE_2STA:
427 /*
428 * These seem to always have timers for TBTT
429 * active in uCode even when not associated yet.
430 */
431 break;
432 }
433
434 value = ctx->beacon_int;
435 if (!value)
436 value = IWL_PASSIVE_DWELL_BASE;
437 value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
438 dwell_time = min(value, dwell_time);
439 }
440
441 return dwell_time;
442 }
443
444 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
445 enum ieee80211_band band)
446 {
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;
450
451 return iwl_limit_dwell(priv, passive);
452 }
453
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)
458 {
459 const struct ieee80211_supported_band *sband;
460 u16 passive_dwell = 0;
461 u16 active_dwell = 0;
462 int added = 0;
463 u16 channel = 0;
464
465 sband = iwl_get_hw_mode(priv, band);
466 if (!sband) {
467 IWL_ERR(priv, "invalid band\n");
468 return added;
469 }
470
471 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
472 passive_dwell = iwl_get_passive_dwell_time(priv, band);
473
474 if (passive_dwell <= active_dwell)
475 passive_dwell = active_dwell + 1;
476
477 channel = iwl_get_single_channel_number(priv, band);
478 if (channel) {
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;
487 else
488 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
489 added++;
490 } else
491 IWL_ERR(priv, "no valid channel found\n");
492 return added;
493 }
494
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)
500 {
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;
506 int added, i;
507 u16 channel;
508
509 sband = iwl_get_hw_mode(priv, band);
510 if (!sband)
511 return 0;
512
513 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
514 passive_dwell = iwl_get_passive_dwell_time(priv, band);
515
516 if (passive_dwell <= active_dwell)
517 passive_dwell = active_dwell + 1;
518
519 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
520 chan = priv->scan_request->channels[i];
521
522 if (chan->band != band)
523 continue;
524
525 channel = chan->hw_value;
526 scan_ch->channel = cpu_to_le16(channel);
527
528 ch_info = iwl_get_channel_info(priv, band, channel);
529 if (!is_channel_valid(ch_info)) {
530 IWL_DEBUG_SCAN(priv,
531 "Channel %d is INVALID for this band.\n",
532 channel);
533 continue;
534 }
535
536 if (!is_active || is_channel_passive(ch_info) ||
537 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
538 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
539 else
540 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
541
542 if (n_probes)
543 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
544
545 scan_ch->active_dwell = cpu_to_le16(active_dwell);
546 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
547
548 /* Set txpower levels to defaults */
549 scan_ch->dsp_atten = 110;
550
551 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
552 * power level:
553 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
554 */
555 if (band == IEEE80211_BAND_5GHZ)
556 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
557 else
558 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
559
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);
566
567 scan_ch++;
568 added++;
569 }
570
571 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
572 return added;
573 }
574
575 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
576 {
577 struct iwl_host_cmd cmd = {
578 .id = REPLY_SCAN_CMD,
579 .len = { sizeof(struct iwl_scan_cmd), },
580 .flags = CMD_SYNC,
581 };
582 struct iwl_scan_cmd *scan;
583 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
584 u32 rate_flags = 0;
585 u16 cmd_len = 0;
586 u16 rx_chain = 0;
587 enum ieee80211_band band;
588 u8 n_probes = 0;
589 u8 rx_ant = hw_params(priv).valid_rx_ant;
590 u8 rate;
591 bool is_active = false;
592 int chan_mod;
593 u8 active_chains;
594 u8 scan_tx_antennas = hw_params(priv).valid_tx_ant;
595 int ret;
596
597 lockdep_assert_held(&priv->mutex);
598
599 if (vif)
600 ctx = iwl_rxon_ctx_from_vif(vif);
601
602 if (!priv->scan_cmd) {
603 priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) +
604 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
605 if (!priv->scan_cmd) {
606 IWL_DEBUG_SCAN(priv,
607 "fail to allocate memory for scan\n");
608 return -ENOMEM;
609 }
610 }
611 scan = priv->scan_cmd;
612 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
613
614 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
615 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
616
617 if (priv->scan_type != IWL_SCAN_ROC &&
618 iwl_is_any_associated(priv)) {
619 u16 interval = 0;
620 u32 extra;
621 u32 suspend_time = 100;
622 u32 scan_suspend_time = 100;
623
624 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
625 switch (priv->scan_type) {
626 case IWL_SCAN_ROC:
627 WARN_ON(1);
628 break;
629 case IWL_SCAN_RADIO_RESET:
630 interval = 0;
631 break;
632 case IWL_SCAN_NORMAL:
633 interval = vif->bss_conf.beacon_int;
634 break;
635 }
636
637 scan->suspend_time = 0;
638 scan->max_out_time = cpu_to_le32(200 * 1024);
639 if (!interval)
640 interval = suspend_time;
641
642 extra = (suspend_time / interval) << 22;
643 scan_suspend_time = (extra |
644 ((suspend_time % interval) * 1024));
645 scan->suspend_time = cpu_to_le32(scan_suspend_time);
646 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
647 scan_suspend_time, interval);
648 } else if (priv->scan_type == IWL_SCAN_ROC) {
649 scan->suspend_time = 0;
650 scan->max_out_time = 0;
651 scan->quiet_time = 0;
652 scan->quiet_plcp_th = 0;
653 }
654
655 switch (priv->scan_type) {
656 case IWL_SCAN_RADIO_RESET:
657 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
658 break;
659 case IWL_SCAN_NORMAL:
660 if (priv->scan_request->n_ssids) {
661 int i, p = 0;
662 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
663 for (i = 0; i < priv->scan_request->n_ssids; i++) {
664 /* always does wildcard anyway */
665 if (!priv->scan_request->ssids[i].ssid_len)
666 continue;
667 scan->direct_scan[p].id = WLAN_EID_SSID;
668 scan->direct_scan[p].len =
669 priv->scan_request->ssids[i].ssid_len;
670 memcpy(scan->direct_scan[p].ssid,
671 priv->scan_request->ssids[i].ssid,
672 priv->scan_request->ssids[i].ssid_len);
673 n_probes++;
674 p++;
675 }
676 is_active = true;
677 } else
678 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
679 break;
680 case IWL_SCAN_ROC:
681 IWL_DEBUG_SCAN(priv, "Start ROC scan.\n");
682 break;
683 }
684
685 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
686 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
687 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
688
689 switch (priv->scan_band) {
690 case IEEE80211_BAND_2GHZ:
691 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
692 chan_mod = le32_to_cpu(
693 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
694 RXON_FLG_CHANNEL_MODE_MSK)
695 >> RXON_FLG_CHANNEL_MODE_POS;
696 if ((priv->scan_request && priv->scan_request->no_cck) ||
697 chan_mod == CHANNEL_MODE_PURE_40) {
698 rate = IWL_RATE_6M_PLCP;
699 } else {
700 rate = IWL_RATE_1M_PLCP;
701 rate_flags = RATE_MCS_CCK_MSK;
702 }
703 /*
704 * Internal scans are passive, so we can indiscriminately set
705 * the BT ignore flag on 2.4 GHz since it applies to TX only.
706 */
707 if (cfg(priv)->bt_params &&
708 cfg(priv)->bt_params->advanced_bt_coexist)
709 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
710 break;
711 case IEEE80211_BAND_5GHZ:
712 rate = IWL_RATE_6M_PLCP;
713 break;
714 default:
715 IWL_WARN(priv, "Invalid scan band\n");
716 return -EIO;
717 }
718
719 /*
720 * If active scanning is requested but a certain channel is
721 * marked passive, we can do active scanning if we detect
722 * transmissions.
723 *
724 * There is an issue with some firmware versions that triggers
725 * a sysassert on a "good CRC threshold" of zero (== disabled),
726 * on a radar channel even though this means that we should NOT
727 * send probes.
728 *
729 * The "good CRC threshold" is the number of frames that we
730 * need to receive during our dwell time on a channel before
731 * sending out probes -- setting this to a huge value will
732 * mean we never reach it, but at the same time work around
733 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
734 * here instead of IWL_GOOD_CRC_TH_DISABLED.
735 *
736 * This was fixed in later versions along with some other
737 * scan changes, and the threshold behaves as a flag in those
738 * versions.
739 */
740 if (priv->new_scan_threshold_behaviour)
741 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
742 IWL_GOOD_CRC_TH_DISABLED;
743 else
744 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
745 IWL_GOOD_CRC_TH_NEVER;
746
747 band = priv->scan_band;
748
749 if (cfg(priv)->scan_rx_antennas[band])
750 rx_ant = cfg(priv)->scan_rx_antennas[band];
751
752 if (band == IEEE80211_BAND_2GHZ &&
753 cfg(priv)->bt_params &&
754 cfg(priv)->bt_params->advanced_bt_coexist) {
755 /* transmit 2.4 GHz probes only on first antenna */
756 scan_tx_antennas = first_antenna(scan_tx_antennas);
757 }
758
759 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
760 priv->scan_tx_ant[band],
761 scan_tx_antennas);
762 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
763 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
764
765 /* In power save mode use one chain, otherwise use all chains */
766 if (test_bit(STATUS_POWER_PMI, &priv->shrd->status)) {
767 /* rx_ant has been set to all valid chains previously */
768 active_chains = rx_ant &
769 ((u8)(priv->chain_noise_data.active_chains));
770 if (!active_chains)
771 active_chains = rx_ant;
772
773 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
774 priv->chain_noise_data.active_chains);
775
776 rx_ant = first_antenna(active_chains);
777 }
778 if (cfg(priv)->bt_params &&
779 cfg(priv)->bt_params->advanced_bt_coexist &&
780 priv->bt_full_concurrent) {
781 /* operated as 1x1 in full concurrency mode */
782 rx_ant = first_antenna(rx_ant);
783 }
784
785 /* MIMO is not used here, but value is required */
786 rx_chain |=
787 hw_params(priv).valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
788 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
789 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
790 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
791 scan->rx_chain = cpu_to_le16(rx_chain);
792 switch (priv->scan_type) {
793 case IWL_SCAN_NORMAL:
794 cmd_len = iwl_fill_probe_req(priv,
795 (struct ieee80211_mgmt *)scan->data,
796 vif->addr,
797 priv->scan_request->ie,
798 priv->scan_request->ie_len,
799 IWL_MAX_SCAN_SIZE - sizeof(*scan));
800 break;
801 case IWL_SCAN_RADIO_RESET:
802 case IWL_SCAN_ROC:
803 /* use bcast addr, will not be transmitted but must be valid */
804 cmd_len = iwl_fill_probe_req(priv,
805 (struct ieee80211_mgmt *)scan->data,
806 iwl_bcast_addr, NULL, 0,
807 IWL_MAX_SCAN_SIZE - sizeof(*scan));
808 break;
809 default:
810 BUG();
811 }
812 scan->tx_cmd.len = cpu_to_le16(cmd_len);
813
814 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
815 RXON_FILTER_BCON_AWARE_MSK);
816
817 switch (priv->scan_type) {
818 case IWL_SCAN_RADIO_RESET:
819 scan->channel_count =
820 iwl_get_single_channel_for_scan(priv, vif, band,
821 (void *)&scan->data[cmd_len]);
822 break;
823 case IWL_SCAN_NORMAL:
824 scan->channel_count =
825 iwl_get_channels_for_scan(priv, vif, band,
826 is_active, n_probes,
827 (void *)&scan->data[cmd_len]);
828 break;
829 case IWL_SCAN_ROC: {
830 struct iwl_scan_channel *scan_ch;
831 int n_chan, i;
832 u16 dwell;
833
834 dwell = iwl_limit_dwell(priv, priv->hw_roc_duration);
835 n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell);
836
837 scan->channel_count = n_chan;
838
839 scan_ch = (void *)&scan->data[cmd_len];
840
841 for (i = 0; i < n_chan; i++) {
842 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
843 scan_ch->channel =
844 cpu_to_le16(priv->hw_roc_channel->hw_value);
845
846 if (i == n_chan - 1)
847 dwell = priv->hw_roc_duration - i * dwell;
848
849 scan_ch->active_dwell =
850 scan_ch->passive_dwell = cpu_to_le16(dwell);
851
852 /* Set txpower levels to defaults */
853 scan_ch->dsp_atten = 110;
854
855 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
856 * power level:
857 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
858 */
859 if (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ)
860 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
861 else
862 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
863
864 scan_ch++;
865 }
866 }
867
868 break;
869 }
870
871 if (scan->channel_count == 0) {
872 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
873 return -EIO;
874 }
875
876 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
877 scan->channel_count * sizeof(struct iwl_scan_channel);
878 cmd.data[0] = scan;
879 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
880 scan->len = cpu_to_le16(cmd.len[0]);
881
882 /* set scan bit here for PAN params */
883 set_bit(STATUS_SCAN_HW, &priv->shrd->status);
884
885 ret = iwlagn_set_pan_params(priv);
886 if (ret)
887 return ret;
888
889 ret = iwl_dvm_send_cmd(priv, &cmd);
890 if (ret) {
891 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
892 iwlagn_set_pan_params(priv);
893 }
894
895 return ret;
896 }
897
898 void iwl_init_scan_params(struct iwl_priv *priv)
899 {
900 u8 ant_idx = fls(hw_params(priv).valid_tx_ant) - 1;
901 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
902 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
903 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
904 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
905 }
906
907 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
908 struct ieee80211_vif *vif,
909 enum iwl_scan_type scan_type,
910 enum ieee80211_band band)
911 {
912 int ret;
913
914 lockdep_assert_held(&priv->mutex);
915
916 cancel_delayed_work(&priv->scan_check);
917
918 if (!iwl_is_ready_rf(priv->shrd)) {
919 IWL_WARN(priv, "Request scan called when driver not ready.\n");
920 return -EIO;
921 }
922
923 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
924 IWL_DEBUG_SCAN(priv,
925 "Multiple concurrent scan requests in parallel.\n");
926 return -EBUSY;
927 }
928
929 if (test_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
930 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
931 return -EBUSY;
932 }
933
934 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
935 scan_type == IWL_SCAN_NORMAL ? "" :
936 scan_type == IWL_SCAN_ROC ? "remain-on-channel " :
937 "internal short ");
938
939 set_bit(STATUS_SCANNING, &priv->shrd->status);
940 priv->scan_type = scan_type;
941 priv->scan_start = jiffies;
942 priv->scan_band = band;
943
944 ret = iwlagn_request_scan(priv, vif);
945 if (ret) {
946 clear_bit(STATUS_SCANNING, &priv->shrd->status);
947 priv->scan_type = IWL_SCAN_NORMAL;
948 return ret;
949 }
950
951 queue_delayed_work(priv->workqueue, &priv->scan_check,
952 IWL_SCAN_CHECK_WATCHDOG);
953
954 return 0;
955 }
956
957
958 /*
959 * internal short scan, this function should only been called while associated.
960 * It will reset and tune the radio to prevent possible RF related problem
961 */
962 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
963 {
964 queue_work(priv->workqueue, &priv->start_internal_scan);
965 }
966
967 static void iwl_bg_start_internal_scan(struct work_struct *work)
968 {
969 struct iwl_priv *priv =
970 container_of(work, struct iwl_priv, start_internal_scan);
971
972 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
973
974 mutex_lock(&priv->mutex);
975
976 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
977 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
978 goto unlock;
979 }
980
981 if (test_bit(STATUS_SCANNING, &priv->shrd->status)) {
982 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
983 goto unlock;
984 }
985
986 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
987 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
988 unlock:
989 mutex_unlock(&priv->mutex);
990 }
991
992 static void iwl_bg_scan_check(struct work_struct *data)
993 {
994 struct iwl_priv *priv =
995 container_of(data, struct iwl_priv, scan_check.work);
996
997 IWL_DEBUG_SCAN(priv, "Scan check work\n");
998
999 /* Since we are here firmware does not finish scan and
1000 * most likely is in bad shape, so we don't bother to
1001 * send abort command, just force scan complete to mac80211 */
1002 mutex_lock(&priv->mutex);
1003 iwl_force_scan_end(priv);
1004 mutex_unlock(&priv->mutex);
1005 }
1006
1007 /**
1008 * iwl_fill_probe_req - fill in all required fields and IE for probe request
1009 */
1010
1011 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
1012 const u8 *ta, const u8 *ies, int ie_len, int left)
1013 {
1014 int len = 0;
1015 u8 *pos = NULL;
1016
1017 /* Make sure there is enough space for the probe request,
1018 * two mandatory IEs and the data */
1019 left -= 24;
1020 if (left < 0)
1021 return 0;
1022
1023 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
1024 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
1025 memcpy(frame->sa, ta, ETH_ALEN);
1026 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
1027 frame->seq_ctrl = 0;
1028
1029 len += 24;
1030
1031 /* ...next IE... */
1032 pos = &frame->u.probe_req.variable[0];
1033
1034 /* fill in our indirect SSID IE */
1035 left -= 2;
1036 if (left < 0)
1037 return 0;
1038 *pos++ = WLAN_EID_SSID;
1039 *pos++ = 0;
1040
1041 len += 2;
1042
1043 if (WARN_ON(left < ie_len))
1044 return len;
1045
1046 if (ies && ie_len) {
1047 memcpy(pos, ies, ie_len);
1048 len += ie_len;
1049 }
1050
1051 return (u16)len;
1052 }
1053
1054 static void iwl_bg_abort_scan(struct work_struct *work)
1055 {
1056 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1057
1058 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1059
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);
1065 }
1066
1067 static void iwl_bg_scan_completed(struct work_struct *work)
1068 {
1069 struct iwl_priv *priv =
1070 container_of(work, struct iwl_priv, scan_completed);
1071
1072 mutex_lock(&priv->mutex);
1073 iwl_process_scan_complete(priv);
1074 mutex_unlock(&priv->mutex);
1075 }
1076
1077 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1078 {
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);
1083 }
1084
1085 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1086 {
1087 cancel_work_sync(&priv->start_internal_scan);
1088 cancel_work_sync(&priv->abort_scan);
1089 cancel_work_sync(&priv->scan_completed);
1090
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);
1095 }
1096 }
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