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07af6ec8d9d23acf19d2202684f2a7f18cb24a3b
[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-sta.h"
37 #include "iwl-io.h"
38 #include "iwl-helpers.h"
39 #include "iwl-agn.h"
40 #include "iwl-trans.h"
41
42 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
43 * sending probe req. This should be set long enough to hear probe responses
44 * from more than one AP. */
45 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
46 #define IWL_ACTIVE_DWELL_TIME_52 (20)
47
48 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
49 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
50
51 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
52 * Must be set longer than active dwell time.
53 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
54 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
55 #define IWL_PASSIVE_DWELL_TIME_52 (10)
56 #define IWL_PASSIVE_DWELL_BASE (100)
57 #define IWL_CHANNEL_TUNE_TIME 5
58
59 static int iwl_send_scan_abort(struct iwl_priv *priv)
60 {
61 int ret;
62 struct iwl_rx_packet *pkt;
63 struct iwl_host_cmd cmd = {
64 .id = REPLY_SCAN_ABORT_CMD,
65 .flags = CMD_SYNC | CMD_WANT_SKB,
66 };
67
68 /* Exit instantly with error when device is not ready
69 * to receive scan abort command or it does not perform
70 * hardware scan currently */
71 if (!test_bit(STATUS_READY, &priv->shrd->status) ||
72 !test_bit(STATUS_GEO_CONFIGURED, &priv->shrd->status) ||
73 !test_bit(STATUS_SCAN_HW, &priv->shrd->status) ||
74 test_bit(STATUS_FW_ERROR, &priv->shrd->status) ||
75 test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
76 return -EIO;
77
78 ret = iwl_trans_send_cmd(trans(priv), &cmd);
79 if (ret)
80 return ret;
81
82 pkt = (struct iwl_rx_packet *)cmd.reply_page;
83 if (pkt->u.status != CAN_ABORT_STATUS) {
84 /* The scan abort will return 1 for success or
85 * 2 for "failure". A failure condition can be
86 * due to simply not being in an active scan which
87 * can occur if we send the scan abort before we
88 * the microcode has notified us that a scan is
89 * completed. */
90 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", pkt->u.status);
91 ret = -EIO;
92 }
93
94 iwl_free_pages(priv->shrd, cmd.reply_page);
95 return ret;
96 }
97
98 static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
99 {
100 /* check if scan was requested from mac80211 */
101 if (priv->scan_request) {
102 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
103 ieee80211_scan_completed(priv->hw, aborted);
104 }
105
106 if (priv->scan_type == IWL_SCAN_ROC) {
107 ieee80211_remain_on_channel_expired(priv->hw);
108 priv->hw_roc_channel = NULL;
109 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
110 }
111
112 priv->scan_type = IWL_SCAN_NORMAL;
113 priv->scan_vif = NULL;
114 priv->scan_request = NULL;
115 }
116
117 void iwl_force_scan_end(struct iwl_priv *priv)
118 {
119 lockdep_assert_held(&priv->shrd->mutex);
120
121 if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) {
122 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
123 return;
124 }
125
126 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
127 clear_bit(STATUS_SCANNING, &priv->shrd->status);
128 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
129 clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
130 iwl_complete_scan(priv, true);
131 }
132
133 static void iwl_do_scan_abort(struct iwl_priv *priv)
134 {
135 int ret;
136
137 lockdep_assert_held(&priv->shrd->mutex);
138
139 if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) {
140 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
141 return;
142 }
143
144 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
145 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
146 return;
147 }
148
149 ret = iwl_send_scan_abort(priv);
150 if (ret) {
151 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
152 iwl_force_scan_end(priv);
153 } else
154 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
155 }
156
157 /**
158 * iwl_scan_cancel - Cancel any currently executing HW scan
159 */
160 int iwl_scan_cancel(struct iwl_priv *priv)
161 {
162 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
163 queue_work(priv->shrd->workqueue, &priv->abort_scan);
164 return 0;
165 }
166
167 /**
168 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
169 * @ms: amount of time to wait (in milliseconds) for scan to abort
170 *
171 */
172 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
173 {
174 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
175
176 lockdep_assert_held(&priv->shrd->mutex);
177
178 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
179
180 iwl_do_scan_abort(priv);
181
182 while (time_before_eq(jiffies, timeout)) {
183 if (!test_bit(STATUS_SCAN_HW, &priv->shrd->status))
184 break;
185 msleep(20);
186 }
187
188 return test_bit(STATUS_SCAN_HW, &priv->shrd->status);
189 }
190
191 /* Service response to REPLY_SCAN_CMD (0x80) */
192 static int iwl_rx_reply_scan(struct iwl_priv *priv,
193 struct iwl_rx_mem_buffer *rxb,
194 struct iwl_device_cmd *cmd)
195 {
196 #ifdef CONFIG_IWLWIFI_DEBUG
197 struct iwl_rx_packet *pkt = rxb_addr(rxb);
198 struct iwl_scanreq_notification *notif =
199 (struct iwl_scanreq_notification *)pkt->u.raw;
200
201 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
202 #endif
203 return 0;
204 }
205
206 /* Service SCAN_START_NOTIFICATION (0x82) */
207 static int iwl_rx_scan_start_notif(struct iwl_priv *priv,
208 struct iwl_rx_mem_buffer *rxb,
209 struct iwl_device_cmd *cmd)
210 {
211 struct iwl_rx_packet *pkt = rxb_addr(rxb);
212 struct iwl_scanstart_notification *notif =
213 (struct iwl_scanstart_notification *)pkt->u.raw;
214 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
215 IWL_DEBUG_SCAN(priv, "Scan start: "
216 "%d [802.11%s] "
217 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
218 notif->channel,
219 notif->band ? "bg" : "a",
220 le32_to_cpu(notif->tsf_high),
221 le32_to_cpu(notif->tsf_low),
222 notif->status, notif->beacon_timer);
223
224 if (priv->scan_type == IWL_SCAN_ROC &&
225 !priv->hw_roc_start_notified) {
226 ieee80211_ready_on_channel(priv->hw);
227 priv->hw_roc_start_notified = true;
228 }
229
230 return 0;
231 }
232
233 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
234 static int iwl_rx_scan_results_notif(struct iwl_priv *priv,
235 struct iwl_rx_mem_buffer *rxb,
236 struct iwl_device_cmd *cmd)
237 {
238 #ifdef CONFIG_IWLWIFI_DEBUG
239 struct iwl_rx_packet *pkt = rxb_addr(rxb);
240 struct iwl_scanresults_notification *notif =
241 (struct iwl_scanresults_notification *)pkt->u.raw;
242
243 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
244 "%d [802.11%s] "
245 "probe status: %u:%u "
246 "(TSF: 0x%08X:%08X) - %d "
247 "elapsed=%lu usec\n",
248 notif->channel,
249 notif->band ? "bg" : "a",
250 notif->probe_status, notif->num_probe_not_sent,
251 le32_to_cpu(notif->tsf_high),
252 le32_to_cpu(notif->tsf_low),
253 le32_to_cpu(notif->statistics[0]),
254 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
255 #endif
256 return 0;
257 }
258
259 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
260 static int iwl_rx_scan_complete_notif(struct iwl_priv *priv,
261 struct iwl_rx_mem_buffer *rxb,
262 struct iwl_device_cmd *cmd)
263 {
264 struct iwl_rx_packet *pkt = rxb_addr(rxb);
265 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
266
267 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
268 scan_notif->scanned_channels,
269 scan_notif->tsf_low,
270 scan_notif->tsf_high, scan_notif->status);
271
272 /* The HW is no longer scanning */
273 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
274
275 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
276 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
277 jiffies_to_msecs(jiffies - priv->scan_start));
278
279 queue_work(priv->shrd->workqueue, &priv->scan_completed);
280
281 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
282 iwl_advanced_bt_coexist(priv) &&
283 priv->bt_status != scan_notif->bt_status) {
284 if (scan_notif->bt_status) {
285 /* BT on */
286 if (!priv->bt_ch_announce)
287 priv->bt_traffic_load =
288 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
289 /*
290 * otherwise, no traffic load information provided
291 * no changes made
292 */
293 } else {
294 /* BT off */
295 priv->bt_traffic_load =
296 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
297 }
298 priv->bt_status = scan_notif->bt_status;
299 queue_work(priv->shrd->workqueue,
300 &priv->bt_traffic_change_work);
301 }
302 return 0;
303 }
304
305 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
306 {
307 /* scan handlers */
308 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
309 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
310 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
311 iwl_rx_scan_results_notif;
312 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
313 iwl_rx_scan_complete_notif;
314 }
315
316 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
317 enum ieee80211_band band, u8 n_probes)
318 {
319 if (band == IEEE80211_BAND_5GHZ)
320 return IWL_ACTIVE_DWELL_TIME_52 +
321 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
322 else
323 return IWL_ACTIVE_DWELL_TIME_24 +
324 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
325 }
326
327 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
328 {
329 struct iwl_rxon_context *ctx;
330
331 /*
332 * If we're associated, we clamp the dwell time 98%
333 * of the smallest beacon interval (minus 2 * channel
334 * tune time)
335 */
336 for_each_context(priv, ctx) {
337 u16 value;
338
339 if (!iwl_is_associated_ctx(ctx))
340 continue;
341 value = ctx->beacon_int;
342 if (!value)
343 value = IWL_PASSIVE_DWELL_BASE;
344 value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
345 dwell_time = min(value, dwell_time);
346 }
347
348 return dwell_time;
349 }
350
351 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
352 enum ieee80211_band band)
353 {
354 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
355 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
356 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
357
358 return iwl_limit_dwell(priv, passive);
359 }
360
361 static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
362 struct ieee80211_vif *vif,
363 enum ieee80211_band band,
364 struct iwl_scan_channel *scan_ch)
365 {
366 const struct ieee80211_supported_band *sband;
367 u16 passive_dwell = 0;
368 u16 active_dwell = 0;
369 int added = 0;
370 u16 channel = 0;
371
372 sband = iwl_get_hw_mode(priv, band);
373 if (!sband) {
374 IWL_ERR(priv, "invalid band\n");
375 return added;
376 }
377
378 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
379 passive_dwell = iwl_get_passive_dwell_time(priv, band);
380
381 if (passive_dwell <= active_dwell)
382 passive_dwell = active_dwell + 1;
383
384 channel = iwl_get_single_channel_number(priv, band);
385 if (channel) {
386 scan_ch->channel = cpu_to_le16(channel);
387 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
388 scan_ch->active_dwell = cpu_to_le16(active_dwell);
389 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
390 /* Set txpower levels to defaults */
391 scan_ch->dsp_atten = 110;
392 if (band == IEEE80211_BAND_5GHZ)
393 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
394 else
395 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
396 added++;
397 } else
398 IWL_ERR(priv, "no valid channel found\n");
399 return added;
400 }
401
402 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
403 struct ieee80211_vif *vif,
404 enum ieee80211_band band,
405 u8 is_active, u8 n_probes,
406 struct iwl_scan_channel *scan_ch)
407 {
408 struct ieee80211_channel *chan;
409 const struct ieee80211_supported_band *sband;
410 const struct iwl_channel_info *ch_info;
411 u16 passive_dwell = 0;
412 u16 active_dwell = 0;
413 int added, i;
414 u16 channel;
415
416 sband = iwl_get_hw_mode(priv, band);
417 if (!sband)
418 return 0;
419
420 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
421 passive_dwell = iwl_get_passive_dwell_time(priv, band);
422
423 if (passive_dwell <= active_dwell)
424 passive_dwell = active_dwell + 1;
425
426 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
427 chan = priv->scan_request->channels[i];
428
429 if (chan->band != band)
430 continue;
431
432 channel = chan->hw_value;
433 scan_ch->channel = cpu_to_le16(channel);
434
435 ch_info = iwl_get_channel_info(priv, band, channel);
436 if (!is_channel_valid(ch_info)) {
437 IWL_DEBUG_SCAN(priv,
438 "Channel %d is INVALID for this band.\n",
439 channel);
440 continue;
441 }
442
443 if (!is_active || is_channel_passive(ch_info) ||
444 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
445 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
446 else
447 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
448
449 if (n_probes)
450 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
451
452 scan_ch->active_dwell = cpu_to_le16(active_dwell);
453 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
454
455 /* Set txpower levels to defaults */
456 scan_ch->dsp_atten = 110;
457
458 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
459 * power level:
460 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
461 */
462 if (band == IEEE80211_BAND_5GHZ)
463 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
464 else
465 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
466
467 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
468 channel, le32_to_cpu(scan_ch->type),
469 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
470 "ACTIVE" : "PASSIVE",
471 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
472 active_dwell : passive_dwell);
473
474 scan_ch++;
475 added++;
476 }
477
478 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
479 return added;
480 }
481
482 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
483 {
484 struct iwl_host_cmd cmd = {
485 .id = REPLY_SCAN_CMD,
486 .len = { sizeof(struct iwl_scan_cmd), },
487 .flags = CMD_SYNC,
488 };
489 struct iwl_scan_cmd *scan;
490 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
491 u32 rate_flags = 0;
492 u16 cmd_len;
493 u16 rx_chain = 0;
494 enum ieee80211_band band;
495 u8 n_probes = 0;
496 u8 rx_ant = hw_params(priv).valid_rx_ant;
497 u8 rate;
498 bool is_active = false;
499 int chan_mod;
500 u8 active_chains;
501 u8 scan_tx_antennas = hw_params(priv).valid_tx_ant;
502 int ret;
503
504 lockdep_assert_held(&priv->shrd->mutex);
505
506 if (vif)
507 ctx = iwl_rxon_ctx_from_vif(vif);
508
509 if (!priv->scan_cmd) {
510 priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) +
511 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
512 if (!priv->scan_cmd) {
513 IWL_DEBUG_SCAN(priv,
514 "fail to allocate memory for scan\n");
515 return -ENOMEM;
516 }
517 }
518 scan = priv->scan_cmd;
519 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
520
521 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
522 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
523
524 if (priv->scan_type != IWL_SCAN_ROC &&
525 iwl_is_any_associated(priv)) {
526 u16 interval = 0;
527 u32 extra;
528 u32 suspend_time = 100;
529 u32 scan_suspend_time = 100;
530
531 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
532 switch (priv->scan_type) {
533 case IWL_SCAN_ROC:
534 WARN_ON(1);
535 break;
536 case IWL_SCAN_RADIO_RESET:
537 interval = 0;
538 break;
539 case IWL_SCAN_NORMAL:
540 interval = vif->bss_conf.beacon_int;
541 break;
542 }
543
544 scan->suspend_time = 0;
545 scan->max_out_time = cpu_to_le32(200 * 1024);
546 if (!interval)
547 interval = suspend_time;
548
549 extra = (suspend_time / interval) << 22;
550 scan_suspend_time = (extra |
551 ((suspend_time % interval) * 1024));
552 scan->suspend_time = cpu_to_le32(scan_suspend_time);
553 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
554 scan_suspend_time, interval);
555 } else if (priv->scan_type == IWL_SCAN_ROC) {
556 scan->suspend_time = 0;
557 scan->max_out_time = 0;
558 scan->quiet_time = 0;
559 scan->quiet_plcp_th = 0;
560 }
561
562 switch (priv->scan_type) {
563 case IWL_SCAN_RADIO_RESET:
564 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
565 break;
566 case IWL_SCAN_NORMAL:
567 if (priv->scan_request->n_ssids) {
568 int i, p = 0;
569 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
570 for (i = 0; i < priv->scan_request->n_ssids; i++) {
571 /* always does wildcard anyway */
572 if (!priv->scan_request->ssids[i].ssid_len)
573 continue;
574 scan->direct_scan[p].id = WLAN_EID_SSID;
575 scan->direct_scan[p].len =
576 priv->scan_request->ssids[i].ssid_len;
577 memcpy(scan->direct_scan[p].ssid,
578 priv->scan_request->ssids[i].ssid,
579 priv->scan_request->ssids[i].ssid_len);
580 n_probes++;
581 p++;
582 }
583 is_active = true;
584 } else
585 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
586 break;
587 case IWL_SCAN_ROC:
588 IWL_DEBUG_SCAN(priv, "Start ROC scan.\n");
589 break;
590 }
591
592 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
593 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
594 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
595
596 switch (priv->scan_band) {
597 case IEEE80211_BAND_2GHZ:
598 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
599 chan_mod = le32_to_cpu(
600 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
601 RXON_FLG_CHANNEL_MODE_MSK)
602 >> RXON_FLG_CHANNEL_MODE_POS;
603 if (chan_mod == CHANNEL_MODE_PURE_40) {
604 rate = IWL_RATE_6M_PLCP;
605 } else {
606 rate = IWL_RATE_1M_PLCP;
607 rate_flags = RATE_MCS_CCK_MSK;
608 }
609 /*
610 * Internal scans are passive, so we can indiscriminately set
611 * the BT ignore flag on 2.4 GHz since it applies to TX only.
612 */
613 if (priv->cfg->bt_params &&
614 priv->cfg->bt_params->advanced_bt_coexist)
615 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
616 break;
617 case IEEE80211_BAND_5GHZ:
618 rate = IWL_RATE_6M_PLCP;
619 break;
620 default:
621 IWL_WARN(priv, "Invalid scan band\n");
622 return -EIO;
623 }
624
625 /*
626 * If active scanning is requested but a certain channel is
627 * marked passive, we can do active scanning if we detect
628 * transmissions.
629 *
630 * There is an issue with some firmware versions that triggers
631 * a sysassert on a "good CRC threshold" of zero (== disabled),
632 * on a radar channel even though this means that we should NOT
633 * send probes.
634 *
635 * The "good CRC threshold" is the number of frames that we
636 * need to receive during our dwell time on a channel before
637 * sending out probes -- setting this to a huge value will
638 * mean we never reach it, but at the same time work around
639 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
640 * here instead of IWL_GOOD_CRC_TH_DISABLED.
641 *
642 * This was fixed in later versions along with some other
643 * scan changes, and the threshold behaves as a flag in those
644 * versions.
645 */
646 if (priv->new_scan_threshold_behaviour)
647 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
648 IWL_GOOD_CRC_TH_DISABLED;
649 else
650 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
651 IWL_GOOD_CRC_TH_NEVER;
652
653 band = priv->scan_band;
654
655 if (priv->cfg->scan_rx_antennas[band])
656 rx_ant = priv->cfg->scan_rx_antennas[band];
657
658 if (band == IEEE80211_BAND_2GHZ &&
659 priv->cfg->bt_params &&
660 priv->cfg->bt_params->advanced_bt_coexist) {
661 /* transmit 2.4 GHz probes only on first antenna */
662 scan_tx_antennas = first_antenna(scan_tx_antennas);
663 }
664
665 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
666 priv->scan_tx_ant[band],
667 scan_tx_antennas);
668 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
669 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
670
671 /* In power save mode use one chain, otherwise use all chains */
672 if (test_bit(STATUS_POWER_PMI, &priv->shrd->status)) {
673 /* rx_ant has been set to all valid chains previously */
674 active_chains = rx_ant &
675 ((u8)(priv->chain_noise_data.active_chains));
676 if (!active_chains)
677 active_chains = rx_ant;
678
679 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
680 priv->chain_noise_data.active_chains);
681
682 rx_ant = first_antenna(active_chains);
683 }
684 if (priv->cfg->bt_params &&
685 priv->cfg->bt_params->advanced_bt_coexist &&
686 priv->bt_full_concurrent) {
687 /* operated as 1x1 in full concurrency mode */
688 rx_ant = first_antenna(rx_ant);
689 }
690
691 /* MIMO is not used here, but value is required */
692 rx_chain |=
693 hw_params(priv).valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
694 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
695 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
696 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
697 scan->rx_chain = cpu_to_le16(rx_chain);
698 switch (priv->scan_type) {
699 case IWL_SCAN_NORMAL:
700 cmd_len = iwl_fill_probe_req(priv,
701 (struct ieee80211_mgmt *)scan->data,
702 vif->addr,
703 priv->scan_request->ie,
704 priv->scan_request->ie_len,
705 IWL_MAX_SCAN_SIZE - sizeof(*scan));
706 break;
707 case IWL_SCAN_RADIO_RESET:
708 case IWL_SCAN_ROC:
709 /* use bcast addr, will not be transmitted but must be valid */
710 cmd_len = iwl_fill_probe_req(priv,
711 (struct ieee80211_mgmt *)scan->data,
712 iwl_bcast_addr, NULL, 0,
713 IWL_MAX_SCAN_SIZE - sizeof(*scan));
714 break;
715 default:
716 BUG();
717 }
718 scan->tx_cmd.len = cpu_to_le16(cmd_len);
719
720 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
721 RXON_FILTER_BCON_AWARE_MSK);
722
723 switch (priv->scan_type) {
724 case IWL_SCAN_RADIO_RESET:
725 scan->channel_count =
726 iwl_get_single_channel_for_scan(priv, vif, band,
727 (void *)&scan->data[cmd_len]);
728 break;
729 case IWL_SCAN_NORMAL:
730 scan->channel_count =
731 iwl_get_channels_for_scan(priv, vif, band,
732 is_active, n_probes,
733 (void *)&scan->data[cmd_len]);
734 break;
735 case IWL_SCAN_ROC: {
736 struct iwl_scan_channel *scan_ch;
737 int n_chan, i;
738 u16 dwell;
739
740 dwell = iwl_limit_dwell(priv, priv->hw_roc_duration);
741 n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell);
742
743 scan->channel_count = n_chan;
744
745 scan_ch = (void *)&scan->data[cmd_len];
746
747 for (i = 0; i < n_chan; i++) {
748 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
749 scan_ch->channel =
750 cpu_to_le16(priv->hw_roc_channel->hw_value);
751
752 if (i == n_chan - 1)
753 dwell = priv->hw_roc_duration - i * dwell;
754
755 scan_ch->active_dwell =
756 scan_ch->passive_dwell = cpu_to_le16(dwell);
757
758 /* Set txpower levels to defaults */
759 scan_ch->dsp_atten = 110;
760
761 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
762 * power level:
763 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
764 */
765 if (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ)
766 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
767 else
768 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
769
770 scan_ch++;
771 }
772 }
773
774 break;
775 }
776
777 if (scan->channel_count == 0) {
778 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
779 return -EIO;
780 }
781
782 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
783 scan->channel_count * sizeof(struct iwl_scan_channel);
784 cmd.data[0] = scan;
785 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
786 scan->len = cpu_to_le16(cmd.len[0]);
787
788 /* set scan bit here for PAN params */
789 set_bit(STATUS_SCAN_HW, &priv->shrd->status);
790
791 ret = iwlagn_set_pan_params(priv);
792 if (ret)
793 return ret;
794
795 ret = iwl_trans_send_cmd(trans(priv), &cmd);
796 if (ret) {
797 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
798 iwlagn_set_pan_params(priv);
799 }
800
801 return ret;
802 }
803
804 void iwl_init_scan_params(struct iwl_priv *priv)
805 {
806 u8 ant_idx = fls(hw_params(priv).valid_tx_ant) - 1;
807 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
808 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
809 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
810 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
811 }
812
813 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
814 struct ieee80211_vif *vif,
815 enum iwl_scan_type scan_type,
816 enum ieee80211_band band)
817 {
818 int ret;
819
820 lockdep_assert_held(&priv->shrd->mutex);
821
822 cancel_delayed_work(&priv->scan_check);
823
824 if (!iwl_is_ready_rf(priv->shrd)) {
825 IWL_WARN(priv, "Request scan called when driver not ready.\n");
826 return -EIO;
827 }
828
829 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
830 IWL_DEBUG_SCAN(priv,
831 "Multiple concurrent scan requests in parallel.\n");
832 return -EBUSY;
833 }
834
835 if (test_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
836 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
837 return -EBUSY;
838 }
839
840 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
841 scan_type == IWL_SCAN_NORMAL ? "" :
842 scan_type == IWL_SCAN_ROC ? "remain-on-channel " :
843 "internal short ");
844
845 set_bit(STATUS_SCANNING, &priv->shrd->status);
846 priv->scan_type = scan_type;
847 priv->scan_start = jiffies;
848 priv->scan_band = band;
849
850 ret = iwlagn_request_scan(priv, vif);
851 if (ret) {
852 clear_bit(STATUS_SCANNING, &priv->shrd->status);
853 priv->scan_type = IWL_SCAN_NORMAL;
854 return ret;
855 }
856
857 queue_delayed_work(priv->shrd->workqueue, &priv->scan_check,
858 IWL_SCAN_CHECK_WATCHDOG);
859
860 return 0;
861 }
862
863 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
864 struct ieee80211_vif *vif,
865 struct cfg80211_scan_request *req)
866 {
867 struct iwl_priv *priv = hw->priv;
868 int ret;
869
870 IWL_DEBUG_MAC80211(priv, "enter\n");
871
872 if (req->n_channels == 0)
873 return -EINVAL;
874
875 mutex_lock(&priv->shrd->mutex);
876
877 if (test_bit(STATUS_SCANNING, &priv->shrd->status) &&
878 priv->scan_type != IWL_SCAN_NORMAL) {
879 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
880 ret = -EAGAIN;
881 goto out_unlock;
882 }
883
884 /* mac80211 will only ask for one band at a time */
885 priv->scan_request = req;
886 priv->scan_vif = vif;
887
888 /*
889 * If an internal scan is in progress, just set
890 * up the scan_request as per above.
891 */
892 if (priv->scan_type != IWL_SCAN_NORMAL) {
893 IWL_DEBUG_SCAN(priv, "SCAN request during internal scan\n");
894 ret = 0;
895 } else
896 ret = iwl_scan_initiate(priv, vif, IWL_SCAN_NORMAL,
897 req->channels[0]->band);
898
899 IWL_DEBUG_MAC80211(priv, "leave\n");
900
901 out_unlock:
902 mutex_unlock(&priv->shrd->mutex);
903
904 return ret;
905 }
906
907 /*
908 * internal short scan, this function should only been called while associated.
909 * It will reset and tune the radio to prevent possible RF related problem
910 */
911 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
912 {
913 queue_work(priv->shrd->workqueue, &priv->start_internal_scan);
914 }
915
916 static void iwl_bg_start_internal_scan(struct work_struct *work)
917 {
918 struct iwl_priv *priv =
919 container_of(work, struct iwl_priv, start_internal_scan);
920
921 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
922
923 mutex_lock(&priv->shrd->mutex);
924
925 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
926 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
927 goto unlock;
928 }
929
930 if (test_bit(STATUS_SCANNING, &priv->shrd->status)) {
931 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
932 goto unlock;
933 }
934
935 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
936 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
937 unlock:
938 mutex_unlock(&priv->shrd->mutex);
939 }
940
941 static void iwl_bg_scan_check(struct work_struct *data)
942 {
943 struct iwl_priv *priv =
944 container_of(data, struct iwl_priv, scan_check.work);
945
946 IWL_DEBUG_SCAN(priv, "Scan check work\n");
947
948 /* Since we are here firmware does not finish scan and
949 * most likely is in bad shape, so we don't bother to
950 * send abort command, just force scan complete to mac80211 */
951 mutex_lock(&priv->shrd->mutex);
952 iwl_force_scan_end(priv);
953 mutex_unlock(&priv->shrd->mutex);
954 }
955
956 /**
957 * iwl_fill_probe_req - fill in all required fields and IE for probe request
958 */
959
960 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
961 const u8 *ta, const u8 *ies, int ie_len, int left)
962 {
963 int len = 0;
964 u8 *pos = NULL;
965
966 /* Make sure there is enough space for the probe request,
967 * two mandatory IEs and the data */
968 left -= 24;
969 if (left < 0)
970 return 0;
971
972 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
973 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
974 memcpy(frame->sa, ta, ETH_ALEN);
975 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
976 frame->seq_ctrl = 0;
977
978 len += 24;
979
980 /* ...next IE... */
981 pos = &frame->u.probe_req.variable[0];
982
983 /* fill in our indirect SSID IE */
984 left -= 2;
985 if (left < 0)
986 return 0;
987 *pos++ = WLAN_EID_SSID;
988 *pos++ = 0;
989
990 len += 2;
991
992 if (WARN_ON(left < ie_len))
993 return len;
994
995 if (ies && ie_len) {
996 memcpy(pos, ies, ie_len);
997 len += ie_len;
998 }
999
1000 return (u16)len;
1001 }
1002
1003 static void iwl_bg_abort_scan(struct work_struct *work)
1004 {
1005 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1006
1007 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1008
1009 /* We keep scan_check work queued in case when firmware will not
1010 * report back scan completed notification */
1011 mutex_lock(&priv->shrd->mutex);
1012 iwl_scan_cancel_timeout(priv, 200);
1013 mutex_unlock(&priv->shrd->mutex);
1014 }
1015
1016 static void iwl_bg_scan_completed(struct work_struct *work)
1017 {
1018 struct iwl_priv *priv =
1019 container_of(work, struct iwl_priv, scan_completed);
1020 bool aborted;
1021
1022 IWL_DEBUG_SCAN(priv, "Completed scan.\n");
1023
1024 cancel_delayed_work(&priv->scan_check);
1025
1026 mutex_lock(&priv->shrd->mutex);
1027
1028 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
1029 if (aborted)
1030 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
1031
1032 if (!test_and_clear_bit(STATUS_SCANNING, &priv->shrd->status)) {
1033 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
1034 goto out_settings;
1035 }
1036
1037 if (priv->scan_type == IWL_SCAN_ROC) {
1038 ieee80211_remain_on_channel_expired(priv->hw);
1039 priv->hw_roc_channel = NULL;
1040 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
1041 }
1042
1043 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
1044 int err;
1045
1046 /* Check if mac80211 requested scan during our internal scan */
1047 if (priv->scan_request == NULL)
1048 goto out_complete;
1049
1050 /* If so request a new scan */
1051 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
1052 priv->scan_request->channels[0]->band);
1053 if (err) {
1054 IWL_DEBUG_SCAN(priv,
1055 "failed to initiate pending scan: %d\n", err);
1056 aborted = true;
1057 goto out_complete;
1058 }
1059
1060 goto out;
1061 }
1062
1063 out_complete:
1064 iwl_complete_scan(priv, aborted);
1065
1066 out_settings:
1067 /* Can we still talk to firmware ? */
1068 if (!iwl_is_ready_rf(priv->shrd))
1069 goto out;
1070
1071 iwlagn_post_scan(priv);
1072
1073 out:
1074 mutex_unlock(&priv->shrd->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->shrd->mutex);
1093 iwl_force_scan_end(priv);
1094 mutex_unlock(&priv->shrd->mutex);
1095 }
1096 }
Linux kernel - Deliverables
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