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
iwl_send_scan_abort(struct iwl_priv * priv)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
iwl_complete_scan(struct iwl_priv * priv,bool aborted)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
iwl_process_scan_complete(struct iwl_priv * priv)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
iwl_force_scan_end(struct iwl_priv * priv)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
iwl_do_scan_abort(struct iwl_priv * priv)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 */
iwl_scan_cancel(struct iwl_priv * priv)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 */
iwl_scan_cancel_timeout(struct iwl_priv * priv,unsigned long ms)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) */
iwl_rx_reply_scan(struct iwl_priv * priv,struct iwl_rx_mem_buffer * rxb,struct iwl_device_cmd * cmd)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) */
iwl_rx_scan_start_notif(struct iwl_priv * priv,struct iwl_rx_mem_buffer * rxb,struct iwl_device_cmd * cmd)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) */
iwl_rx_scan_results_notif(struct iwl_priv * priv,struct iwl_rx_mem_buffer * rxb,struct iwl_device_cmd * cmd)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) */
iwl_rx_scan_complete_notif(struct iwl_priv * priv,struct iwl_rx_mem_buffer * rxb,struct iwl_device_cmd * cmd)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
iwl_setup_rx_scan_handlers(struct iwl_priv * priv)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
iwl_get_active_dwell_time(struct iwl_priv * priv,enum ieee80211_band band,u8 n_probes)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
iwl_limit_dwell(struct iwl_priv * priv,u16 dwell_time)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 if (ctx->staging.dev_type == RXON_DEV_TYPE_P2P)
420 continue;
421 value = ctx->beacon_int;
422 if (!value)
423 value = IWL_PASSIVE_DWELL_BASE;
424 value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
425 dwell_time = min(value, dwell_time);
426 }
427
428 return dwell_time;
429 }
430
iwl_get_passive_dwell_time(struct iwl_priv * priv,enum ieee80211_band band)431 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
432 enum ieee80211_band band)
433 {
434 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
435 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
436 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
437
438 return iwl_limit_dwell(priv, passive);
439 }
440
iwl_get_single_channel_for_scan(struct iwl_priv * priv,struct ieee80211_vif * vif,enum ieee80211_band band,struct iwl_scan_channel * scan_ch)441 static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
442 struct ieee80211_vif *vif,
443 enum ieee80211_band band,
444 struct iwl_scan_channel *scan_ch)
445 {
446 const struct ieee80211_supported_band *sband;
447 u16 passive_dwell = 0;
448 u16 active_dwell = 0;
449 int added = 0;
450 u16 channel = 0;
451
452 sband = iwl_get_hw_mode(priv, band);
453 if (!sband) {
454 IWL_ERR(priv, "invalid band\n");
455 return added;
456 }
457
458 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
459 passive_dwell = iwl_get_passive_dwell_time(priv, band);
460
461 if (passive_dwell <= active_dwell)
462 passive_dwell = active_dwell + 1;
463
464 channel = iwl_get_single_channel_number(priv, band);
465 if (channel) {
466 scan_ch->channel = cpu_to_le16(channel);
467 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
468 scan_ch->active_dwell = cpu_to_le16(active_dwell);
469 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
470 /* Set txpower levels to defaults */
471 scan_ch->dsp_atten = 110;
472 if (band == IEEE80211_BAND_5GHZ)
473 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
474 else
475 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
476 added++;
477 } else
478 IWL_ERR(priv, "no valid channel found\n");
479 return added;
480 }
481
iwl_get_channels_for_scan(struct iwl_priv * priv,struct ieee80211_vif * vif,enum ieee80211_band band,u8 is_active,u8 n_probes,struct iwl_scan_channel * scan_ch)482 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
483 struct ieee80211_vif *vif,
484 enum ieee80211_band band,
485 u8 is_active, u8 n_probes,
486 struct iwl_scan_channel *scan_ch)
487 {
488 struct ieee80211_channel *chan;
489 const struct ieee80211_supported_band *sband;
490 const struct iwl_channel_info *ch_info;
491 u16 passive_dwell = 0;
492 u16 active_dwell = 0;
493 int added, i;
494 u16 channel;
495
496 sband = iwl_get_hw_mode(priv, band);
497 if (!sband)
498 return 0;
499
500 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
501 passive_dwell = iwl_get_passive_dwell_time(priv, band);
502
503 if (passive_dwell <= active_dwell)
504 passive_dwell = active_dwell + 1;
505
506 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
507 chan = priv->scan_request->channels[i];
508
509 if (chan->band != band)
510 continue;
511
512 channel = chan->hw_value;
513 scan_ch->channel = cpu_to_le16(channel);
514
515 ch_info = iwl_get_channel_info(priv, band, channel);
516 if (!is_channel_valid(ch_info)) {
517 IWL_DEBUG_SCAN(priv,
518 "Channel %d is INVALID for this band.\n",
519 channel);
520 continue;
521 }
522
523 if (!is_active || is_channel_passive(ch_info) ||
524 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
525 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
526 else
527 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
528
529 if (n_probes)
530 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
531
532 scan_ch->active_dwell = cpu_to_le16(active_dwell);
533 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
534
535 /* Set txpower levels to defaults */
536 scan_ch->dsp_atten = 110;
537
538 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
539 * power level:
540 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
541 */
542 if (band == IEEE80211_BAND_5GHZ)
543 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
544 else
545 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
546
547 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
548 channel, le32_to_cpu(scan_ch->type),
549 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
550 "ACTIVE" : "PASSIVE",
551 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
552 active_dwell : passive_dwell);
553
554 scan_ch++;
555 added++;
556 }
557
558 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
559 return added;
560 }
561
iwlagn_request_scan(struct iwl_priv * priv,struct ieee80211_vif * vif)562 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
563 {
564 struct iwl_host_cmd cmd = {
565 .id = REPLY_SCAN_CMD,
566 .len = { sizeof(struct iwl_scan_cmd), },
567 .flags = CMD_SYNC,
568 };
569 struct iwl_scan_cmd *scan;
570 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
571 u32 rate_flags = 0;
572 u16 cmd_len = 0;
573 u16 rx_chain = 0;
574 enum ieee80211_band band;
575 u8 n_probes = 0;
576 u8 rx_ant = hw_params(priv).valid_rx_ant;
577 u8 rate;
578 bool is_active = false;
579 int chan_mod;
580 u8 active_chains;
581 u8 scan_tx_antennas = hw_params(priv).valid_tx_ant;
582 int ret;
583
584 lockdep_assert_held(&priv->shrd->mutex);
585
586 if (vif)
587 ctx = iwl_rxon_ctx_from_vif(vif);
588
589 if (!priv->scan_cmd) {
590 priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) +
591 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
592 if (!priv->scan_cmd) {
593 IWL_DEBUG_SCAN(priv,
594 "fail to allocate memory for scan\n");
595 return -ENOMEM;
596 }
597 }
598 scan = priv->scan_cmd;
599 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
600
601 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
602 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
603
604 if (priv->scan_type != IWL_SCAN_ROC &&
605 iwl_is_any_associated(priv)) {
606 u16 interval = 0;
607 u32 extra;
608 u32 suspend_time = 100;
609 u32 scan_suspend_time = 100;
610
611 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
612 switch (priv->scan_type) {
613 case IWL_SCAN_ROC:
614 WARN_ON(1);
615 break;
616 case IWL_SCAN_RADIO_RESET:
617 interval = 0;
618 break;
619 case IWL_SCAN_NORMAL:
620 interval = vif->bss_conf.beacon_int;
621 break;
622 }
623
624 scan->suspend_time = 0;
625 scan->max_out_time = cpu_to_le32(200 * 1024);
626 if (!interval)
627 interval = suspend_time;
628
629 extra = (suspend_time / interval) << 22;
630 scan_suspend_time = (extra |
631 ((suspend_time % interval) * 1024));
632 scan->suspend_time = cpu_to_le32(scan_suspend_time);
633 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
634 scan_suspend_time, interval);
635 } else if (priv->scan_type == IWL_SCAN_ROC) {
636 scan->suspend_time = 0;
637 scan->max_out_time = 0;
638 scan->quiet_time = 0;
639 scan->quiet_plcp_th = 0;
640 }
641
642 switch (priv->scan_type) {
643 case IWL_SCAN_RADIO_RESET:
644 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
645 break;
646 case IWL_SCAN_NORMAL:
647 if (priv->scan_request->n_ssids) {
648 int i, p = 0;
649 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
650 for (i = 0; i < priv->scan_request->n_ssids; i++) {
651 /* always does wildcard anyway */
652 if (!priv->scan_request->ssids[i].ssid_len)
653 continue;
654 scan->direct_scan[p].id = WLAN_EID_SSID;
655 scan->direct_scan[p].len =
656 priv->scan_request->ssids[i].ssid_len;
657 memcpy(scan->direct_scan[p].ssid,
658 priv->scan_request->ssids[i].ssid,
659 priv->scan_request->ssids[i].ssid_len);
660 n_probes++;
661 p++;
662 }
663 is_active = true;
664 } else
665 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
666 break;
667 case IWL_SCAN_ROC:
668 IWL_DEBUG_SCAN(priv, "Start ROC scan.\n");
669 break;
670 }
671
672 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
673 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
674 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
675
676 switch (priv->scan_band) {
677 case IEEE80211_BAND_2GHZ:
678 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
679 chan_mod = le32_to_cpu(
680 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
681 RXON_FLG_CHANNEL_MODE_MSK)
682 >> RXON_FLG_CHANNEL_MODE_POS;
683 if ((priv->scan_request && priv->scan_request->no_cck) ||
684 chan_mod == CHANNEL_MODE_PURE_40) {
685 rate = IWL_RATE_6M_PLCP;
686 } else {
687 rate = IWL_RATE_1M_PLCP;
688 rate_flags = RATE_MCS_CCK_MSK;
689 }
690 /*
691 * Internal scans are passive, so we can indiscriminately set
692 * the BT ignore flag on 2.4 GHz since it applies to TX only.
693 */
694 if (cfg(priv)->bt_params &&
695 cfg(priv)->bt_params->advanced_bt_coexist)
696 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
697 break;
698 case IEEE80211_BAND_5GHZ:
699 rate = IWL_RATE_6M_PLCP;
700 break;
701 default:
702 IWL_WARN(priv, "Invalid scan band\n");
703 return -EIO;
704 }
705
706 /*
707 * If active scanning is requested but a certain channel is
708 * marked passive, we can do active scanning if we detect
709 * transmissions.
710 *
711 * There is an issue with some firmware versions that triggers
712 * a sysassert on a "good CRC threshold" of zero (== disabled),
713 * on a radar channel even though this means that we should NOT
714 * send probes.
715 *
716 * The "good CRC threshold" is the number of frames that we
717 * need to receive during our dwell time on a channel before
718 * sending out probes -- setting this to a huge value will
719 * mean we never reach it, but at the same time work around
720 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
721 * here instead of IWL_GOOD_CRC_TH_DISABLED.
722 *
723 * This was fixed in later versions along with some other
724 * scan changes, and the threshold behaves as a flag in those
725 * versions.
726 */
727 if (priv->new_scan_threshold_behaviour)
728 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
729 IWL_GOOD_CRC_TH_DISABLED;
730 else
731 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
732 IWL_GOOD_CRC_TH_NEVER;
733
734 band = priv->scan_band;
735
736 if (cfg(priv)->scan_rx_antennas[band])
737 rx_ant = cfg(priv)->scan_rx_antennas[band];
738
739 if (band == IEEE80211_BAND_2GHZ &&
740 cfg(priv)->bt_params &&
741 cfg(priv)->bt_params->advanced_bt_coexist) {
742 /* transmit 2.4 GHz probes only on first antenna */
743 scan_tx_antennas = first_antenna(scan_tx_antennas);
744 }
745
746 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
747 priv->scan_tx_ant[band],
748 scan_tx_antennas);
749 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
750 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
751
752 /* In power save mode use one chain, otherwise use all chains */
753 if (test_bit(STATUS_POWER_PMI, &priv->shrd->status)) {
754 /* rx_ant has been set to all valid chains previously */
755 active_chains = rx_ant &
756 ((u8)(priv->chain_noise_data.active_chains));
757 if (!active_chains)
758 active_chains = rx_ant;
759
760 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
761 priv->chain_noise_data.active_chains);
762
763 rx_ant = first_antenna(active_chains);
764 }
765 if (cfg(priv)->bt_params &&
766 cfg(priv)->bt_params->advanced_bt_coexist &&
767 priv->bt_full_concurrent) {
768 /* operated as 1x1 in full concurrency mode */
769 rx_ant = first_antenna(rx_ant);
770 }
771
772 /* MIMO is not used here, but value is required */
773 rx_chain |=
774 hw_params(priv).valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
775 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
776 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
777 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
778 scan->rx_chain = cpu_to_le16(rx_chain);
779 switch (priv->scan_type) {
780 case IWL_SCAN_NORMAL:
781 cmd_len = iwl_fill_probe_req(priv,
782 (struct ieee80211_mgmt *)scan->data,
783 vif->addr,
784 priv->scan_request->ie,
785 priv->scan_request->ie_len,
786 IWL_MAX_SCAN_SIZE - sizeof(*scan));
787 break;
788 case IWL_SCAN_RADIO_RESET:
789 case IWL_SCAN_ROC:
790 /* use bcast addr, will not be transmitted but must be valid */
791 cmd_len = iwl_fill_probe_req(priv,
792 (struct ieee80211_mgmt *)scan->data,
793 iwl_bcast_addr, NULL, 0,
794 IWL_MAX_SCAN_SIZE - sizeof(*scan));
795 break;
796 default:
797 BUG();
798 }
799 scan->tx_cmd.len = cpu_to_le16(cmd_len);
800
801 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
802 RXON_FILTER_BCON_AWARE_MSK);
803
804 switch (priv->scan_type) {
805 case IWL_SCAN_RADIO_RESET:
806 scan->channel_count =
807 iwl_get_single_channel_for_scan(priv, vif, band,
808 (void *)&scan->data[cmd_len]);
809 break;
810 case IWL_SCAN_NORMAL:
811 scan->channel_count =
812 iwl_get_channels_for_scan(priv, vif, band,
813 is_active, n_probes,
814 (void *)&scan->data[cmd_len]);
815 break;
816 case IWL_SCAN_ROC: {
817 struct iwl_scan_channel *scan_ch;
818 int n_chan, i;
819 u16 dwell;
820
821 dwell = iwl_limit_dwell(priv, priv->hw_roc_duration);
822 n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell);
823
824 scan->channel_count = n_chan;
825
826 scan_ch = (void *)&scan->data[cmd_len];
827
828 for (i = 0; i < n_chan; i++) {
829 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
830 scan_ch->channel =
831 cpu_to_le16(priv->hw_roc_channel->hw_value);
832
833 if (i == n_chan - 1)
834 dwell = priv->hw_roc_duration - i * dwell;
835
836 scan_ch->active_dwell =
837 scan_ch->passive_dwell = cpu_to_le16(dwell);
838
839 /* Set txpower levels to defaults */
840 scan_ch->dsp_atten = 110;
841
842 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
843 * power level:
844 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
845 */
846 if (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ)
847 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
848 else
849 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
850
851 scan_ch++;
852 }
853 }
854
855 break;
856 }
857
858 if (scan->channel_count == 0) {
859 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
860 return -EIO;
861 }
862
863 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
864 scan->channel_count * sizeof(struct iwl_scan_channel);
865 cmd.data[0] = scan;
866 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
867 scan->len = cpu_to_le16(cmd.len[0]);
868
869 /* set scan bit here for PAN params */
870 set_bit(STATUS_SCAN_HW, &priv->shrd->status);
871
872 ret = iwlagn_set_pan_params(priv);
873 if (ret)
874 return ret;
875
876 ret = iwl_trans_send_cmd(trans(priv), &cmd);
877 if (ret) {
878 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
879 iwlagn_set_pan_params(priv);
880 }
881
882 return ret;
883 }
884
iwl_init_scan_params(struct iwl_priv * priv)885 void iwl_init_scan_params(struct iwl_priv *priv)
886 {
887 u8 ant_idx = fls(hw_params(priv).valid_tx_ant) - 1;
888 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
889 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
890 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
891 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
892 }
893
iwl_scan_initiate(struct iwl_priv * priv,struct ieee80211_vif * vif,enum iwl_scan_type scan_type,enum ieee80211_band band)894 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
895 struct ieee80211_vif *vif,
896 enum iwl_scan_type scan_type,
897 enum ieee80211_band band)
898 {
899 int ret;
900
901 lockdep_assert_held(&priv->shrd->mutex);
902
903 cancel_delayed_work(&priv->scan_check);
904
905 if (!iwl_is_ready_rf(priv->shrd)) {
906 IWL_WARN(priv, "Request scan called when driver not ready.\n");
907 return -EIO;
908 }
909
910 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
911 IWL_DEBUG_SCAN(priv,
912 "Multiple concurrent scan requests in parallel.\n");
913 return -EBUSY;
914 }
915
916 if (test_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
917 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
918 return -EBUSY;
919 }
920
921 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
922 scan_type == IWL_SCAN_NORMAL ? "" :
923 scan_type == IWL_SCAN_ROC ? "remain-on-channel " :
924 "internal short ");
925
926 set_bit(STATUS_SCANNING, &priv->shrd->status);
927 priv->scan_type = scan_type;
928 priv->scan_start = jiffies;
929 priv->scan_band = band;
930
931 ret = iwlagn_request_scan(priv, vif);
932 if (ret) {
933 clear_bit(STATUS_SCANNING, &priv->shrd->status);
934 priv->scan_type = IWL_SCAN_NORMAL;
935 return ret;
936 }
937
938 queue_delayed_work(priv->shrd->workqueue, &priv->scan_check,
939 IWL_SCAN_CHECK_WATCHDOG);
940
941 return 0;
942 }
943
944
945 /*
946 * internal short scan, this function should only been called while associated.
947 * It will reset and tune the radio to prevent possible RF related problem
948 */
iwl_internal_short_hw_scan(struct iwl_priv * priv)949 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
950 {
951 queue_work(priv->shrd->workqueue, &priv->start_internal_scan);
952 }
953
iwl_bg_start_internal_scan(struct work_struct * work)954 static void iwl_bg_start_internal_scan(struct work_struct *work)
955 {
956 struct iwl_priv *priv =
957 container_of(work, struct iwl_priv, start_internal_scan);
958
959 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
960
961 mutex_lock(&priv->shrd->mutex);
962
963 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
964 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
965 goto unlock;
966 }
967
968 if (test_bit(STATUS_SCANNING, &priv->shrd->status)) {
969 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
970 goto unlock;
971 }
972
973 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
974 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
975 unlock:
976 mutex_unlock(&priv->shrd->mutex);
977 }
978
iwl_bg_scan_check(struct work_struct * data)979 static void iwl_bg_scan_check(struct work_struct *data)
980 {
981 struct iwl_priv *priv =
982 container_of(data, struct iwl_priv, scan_check.work);
983
984 IWL_DEBUG_SCAN(priv, "Scan check work\n");
985
986 /* Since we are here firmware does not finish scan and
987 * most likely is in bad shape, so we don't bother to
988 * send abort command, just force scan complete to mac80211 */
989 mutex_lock(&priv->shrd->mutex);
990 iwl_force_scan_end(priv);
991 mutex_unlock(&priv->shrd->mutex);
992 }
993
994 /**
995 * iwl_fill_probe_req - fill in all required fields and IE for probe request
996 */
997
iwl_fill_probe_req(struct iwl_priv * priv,struct ieee80211_mgmt * frame,const u8 * ta,const u8 * ies,int ie_len,int left)998 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
999 const u8 *ta, const u8 *ies, int ie_len, int left)
1000 {
1001 int len = 0;
1002 u8 *pos = NULL;
1003
1004 /* Make sure there is enough space for the probe request,
1005 * two mandatory IEs and the data */
1006 left -= 24;
1007 if (left < 0)
1008 return 0;
1009
1010 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
1011 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
1012 memcpy(frame->sa, ta, ETH_ALEN);
1013 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
1014 frame->seq_ctrl = 0;
1015
1016 len += 24;
1017
1018 /* ...next IE... */
1019 pos = &frame->u.probe_req.variable[0];
1020
1021 /* fill in our indirect SSID IE */
1022 left -= 2;
1023 if (left < 0)
1024 return 0;
1025 *pos++ = WLAN_EID_SSID;
1026 *pos++ = 0;
1027
1028 len += 2;
1029
1030 if (WARN_ON(left < ie_len))
1031 return len;
1032
1033 if (ies && ie_len) {
1034 memcpy(pos, ies, ie_len);
1035 len += ie_len;
1036 }
1037
1038 return (u16)len;
1039 }
1040
iwl_bg_abort_scan(struct work_struct * work)1041 static void iwl_bg_abort_scan(struct work_struct *work)
1042 {
1043 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1044
1045 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1046
1047 /* We keep scan_check work queued in case when firmware will not
1048 * report back scan completed notification */
1049 mutex_lock(&priv->shrd->mutex);
1050 iwl_scan_cancel_timeout(priv, 200);
1051 mutex_unlock(&priv->shrd->mutex);
1052 }
1053
iwl_bg_scan_completed(struct work_struct * work)1054 static void iwl_bg_scan_completed(struct work_struct *work)
1055 {
1056 struct iwl_priv *priv =
1057 container_of(work, struct iwl_priv, scan_completed);
1058
1059 mutex_lock(&priv->shrd->mutex);
1060 iwl_process_scan_complete(priv);
1061 mutex_unlock(&priv->shrd->mutex);
1062 }
1063
iwl_setup_scan_deferred_work(struct iwl_priv * priv)1064 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1065 {
1066 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
1067 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
1068 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
1069 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1070 }
1071
iwl_cancel_scan_deferred_work(struct iwl_priv * priv)1072 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1073 {
1074 cancel_work_sync(&priv->start_internal_scan);
1075 cancel_work_sync(&priv->abort_scan);
1076 cancel_work_sync(&priv->scan_completed);
1077
1078 if (cancel_delayed_work_sync(&priv->scan_check)) {
1079 mutex_lock(&priv->shrd->mutex);
1080 iwl_force_scan_end(priv);
1081 mutex_unlock(&priv->shrd->mutex);
1082 }
1083 }
1084