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iwl3945: fix memory corruption
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
CommitLineData
2a421b91
TW		 1/******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
1f447808 5 * Copyright(c) 2008 - 2010 Intel Corporation. All rights reserved.
2a421b91
TW		 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:
759ef89f 25 * Intel Linux Wireless <ilw@linux.intel.com>
2a421b91
TW		 26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
7e272fcf 28#include <linux/types.h>
2a421b91 29#include <linux/etherdevice.h>
7e272fcf 30#include <net/mac80211.h>
2a421b91
TW		 31
32#include "iwl-eeprom.h"
33#include "iwl-dev.h"
34#include "iwl-core.h"
35#include "iwl-sta.h"
36#include "iwl-io.h"
37#include "iwl-helpers.h"
38
39/* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
40 * sending probe req. This should be set long enough to hear probe responses
41 * from more than one AP. */
fe905f1d
TW		 42#define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
43#define IWL_ACTIVE_DWELL_TIME_52 (20)
44
45#define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
46#define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
2a421b91 47
2a421b91
TW		 48/* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
49 * Must be set longer than active dwell time.
50 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
51#define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
52#define IWL_PASSIVE_DWELL_TIME_52 (10)
53#define IWL_PASSIVE_DWELL_BASE (100)
54#define IWL_CHANNEL_TUNE_TIME 5
55
fe905f1d
TW		 56
57
2a421b91
TW		 58/**
59 * iwl_scan_cancel - Cancel any currently executing HW scan
60 *
61 * NOTE: priv->mutex is not required before calling this function
62 */
63int iwl_scan_cancel(struct iwl_priv *priv)
64{
65 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
66 clear_bit(STATUS_SCANNING, &priv->status);
67 return 0;
68 }
69
70 if (test_bit(STATUS_SCANNING, &priv->status)) {
71 if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
e1623446 72 IWL_DEBUG_SCAN(priv, "Queuing scan abort.\n");
2a421b91
TW		 73 set_bit(STATUS_SCAN_ABORTING, &priv->status);
74 queue_work(priv->workqueue, &priv->abort_scan);
75
76 } else
e1623446 77 IWL_DEBUG_SCAN(priv, "Scan abort already in progress.\n");
2a421b91
TW		 78
79 return test_bit(STATUS_SCANNING, &priv->status);
80 }
81
82 return 0;
83}
84EXPORT_SYMBOL(iwl_scan_cancel);
85/**
86 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
87 * @ms: amount of time to wait (in milliseconds) for scan to abort
88 *
89 * NOTE: priv->mutex must be held before calling this function
90 */
91int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
92{
93 unsigned long now = jiffies;
94 int ret;
95
96 ret = iwl_scan_cancel(priv);
97 if (ret && ms) {
98 mutex_unlock(&priv->mutex);
99 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
100 test_bit(STATUS_SCANNING, &priv->status))
101 msleep(1);
102 mutex_lock(&priv->mutex);
103
104 return test_bit(STATUS_SCANNING, &priv->status);
105 }
106
107 return ret;
108}
109EXPORT_SYMBOL(iwl_scan_cancel_timeout);
110
4e05c234 111static int iwl_send_scan_abort(struct iwl_priv *priv)
2a421b91
TW		 112{
113 int ret = 0;
2f301227 114 struct iwl_rx_packet *pkt;
2a421b91
TW		 115 struct iwl_host_cmd cmd = {
116 .id = REPLY_SCAN_ABORT_CMD,
c2acea8e 117 .flags = CMD_WANT_SKB,
2a421b91
TW		 118 };
119
120 /* If there isn't a scan actively going on in the hardware
121 * then we are in between scan bands and not actually
122 * actively scanning, so don't send the abort command */
123 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
124 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
125 return 0;
126 }
127
128 ret = iwl_send_cmd_sync(priv, &cmd);
129 if (ret) {
130 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
131 return ret;
132 }
133
2f301227
ZY		 134 pkt = (struct iwl_rx_packet *)cmd.reply_page;
135 if (pkt->u.status != CAN_ABORT_STATUS) {
2a421b91
TW		 136 /* The scan abort will return 1 for success or
137 * 2 for "failure". A failure condition can be
138 * due to simply not being in an active scan which
139 * can occur if we send the scan abort before we
140 * the microcode has notified us that a scan is
141 * completed. */
2f301227 142 IWL_DEBUG_INFO(priv, "SCAN_ABORT returned %d.\n", pkt->u.status);
2a421b91
TW		 143 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
144 clear_bit(STATUS_SCAN_HW, &priv->status);
145 }
146
64a76b50 147 iwl_free_pages(priv, cmd.reply_page);
2a421b91
TW		 148
149 return ret;
150}
2a421b91
TW		 151
152/* Service response to REPLY_SCAN_CMD (0x80) */
153static void iwl_rx_reply_scan(struct iwl_priv *priv,
154 struct iwl_rx_mem_buffer *rxb)
155{
156#ifdef CONFIG_IWLWIFI_DEBUG
2f301227 157 struct iwl_rx_packet *pkt = rxb_addr(rxb);
2a421b91
TW		 158 struct iwl_scanreq_notification *notif =
159 (struct iwl_scanreq_notification *)pkt->u.raw;
160
e1623446 161 IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
2a421b91
TW		 162#endif
163}
164
165/* Service SCAN_START_NOTIFICATION (0x82) */
166static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
167 struct iwl_rx_mem_buffer *rxb)
168{
2f301227 169 struct iwl_rx_packet *pkt = rxb_addr(rxb);
2a421b91
TW		 170 struct iwl_scanstart_notification *notif =
171 (struct iwl_scanstart_notification *)pkt->u.raw;
172 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
e1623446 173 IWL_DEBUG_SCAN(priv, "Scan start: "
2a421b91
TW		 174 "%d [802.11%s] "
175 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
176 notif->channel,
177 notif->band ? "bg" : "a",
fe905f1d
TW		 178 le32_to_cpu(notif->tsf_high),
179 le32_to_cpu(notif->tsf_low),
180 notif->status, notif->beacon_timer);
2a421b91
TW		 181}
182
183/* Service SCAN_RESULTS_NOTIFICATION (0x83) */
184static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
185 struct iwl_rx_mem_buffer *rxb)
186{
187#ifdef CONFIG_IWLWIFI_DEBUG
2f301227 188 struct iwl_rx_packet *pkt = rxb_addr(rxb);
2a421b91
TW		 189 struct iwl_scanresults_notification *notif =
190 (struct iwl_scanresults_notification *)pkt->u.raw;
191
e1623446 192 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
2a421b91
TW		 193 "%d [802.11%s] "
194 "(TSF: 0x%08X:%08X) - %d "
220575f7 195 "elapsed=%lu usec\n",
2a421b91
TW		 196 notif->channel,
197 notif->band ? "bg" : "a",
198 le32_to_cpu(notif->tsf_high),
199 le32_to_cpu(notif->tsf_low),
200 le32_to_cpu(notif->statistics[0]),
220575f7 201 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
2a421b91
TW		 202#endif
203
d4d59e88
WYG		 204 if (!priv->is_internal_short_scan)
205 priv->next_scan_jiffies = 0;
2a421b91
TW		 206}
207
208/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
209static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
210 struct iwl_rx_mem_buffer *rxb)
211{
cb9289cb 212#ifdef CONFIG_IWLWIFI_DEBUG
2f301227 213 struct iwl_rx_packet *pkt = rxb_addr(rxb);
2a421b91
TW		 214 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
215
e1623446 216 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
2a421b91
TW		 217 scan_notif->scanned_channels,
218 scan_notif->tsf_low,
219 scan_notif->tsf_high, scan_notif->status);
cb9289cb 220#endif
2a421b91
TW		 221
222 /* The HW is no longer scanning */
223 clear_bit(STATUS_SCAN_HW, &priv->status);
224
e1623446 225 IWL_DEBUG_INFO(priv, "Scan pass on %sGHz took %dms\n",
1b63ba8a
DM		 226 (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
227 "2.4" : "5.2",
2a421b91
TW		 228 jiffies_to_msecs(elapsed_jiffies
229 (priv->scan_pass_start, jiffies)));
230
1b63ba8a
DM		 231 /* Remove this scanned band from the list of pending
232 * bands to scan, band G precedes A in order of scanning
233 * as seen in iwl_bg_request_scan */
234 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
235 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
236 else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ))
237 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
2a421b91
TW		 238
239 /* If a request to abort was given, or the scan did not succeed
240 * then we reset the scan state machine and terminate,
241 * re-queuing another scan if one has been requested */
242 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
e1623446 243 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
2a421b91
TW		 244 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
245 } else {
246 /* If there are more bands on this scan pass reschedule */
1b63ba8a 247 if (priv->scan_bands)
2a421b91
TW		 248 goto reschedule;
249 }
250
d4d59e88
WYG		 251 if (!priv->is_internal_short_scan)
252 priv->next_scan_jiffies = 0;
d4d59e88 253
e1623446 254 IWL_DEBUG_INFO(priv, "Setting scan to off\n");
2a421b91
TW		 255
256 clear_bit(STATUS_SCANNING, &priv->status);
257
e1623446 258 IWL_DEBUG_INFO(priv, "Scan took %dms\n",
2a421b91
TW		 259 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
260
261 queue_work(priv->workqueue, &priv->scan_completed);
262
263 return;
264
265reschedule:
266 priv->scan_pass_start = jiffies;
267 queue_work(priv->workqueue, &priv->request_scan);
268}
269
270void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
271{
272 /* scan handlers */
273 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
274 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
275 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
276 iwl_rx_scan_results_notif;
277 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
278 iwl_rx_scan_complete_notif;
279}
280EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
281
77fecfb8
SO		 282inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
283 enum ieee80211_band band,
284 u8 n_probes)
2a421b91
TW		 285{
286 if (band == IEEE80211_BAND_5GHZ)
fe905f1d
TW		 287 return IWL_ACTIVE_DWELL_TIME_52 +
288 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
2a421b91 289 else
fe905f1d
TW		 290 return IWL_ACTIVE_DWELL_TIME_24 +
291 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
2a421b91 292}
77fecfb8 293EXPORT_SYMBOL(iwl_get_active_dwell_time);
2a421b91 294
77fecfb8
SO		 295u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
296 enum ieee80211_band band)
2a421b91 297{
fe905f1d 298 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
2a421b91
TW		 299 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
300 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
301
302 if (iwl_is_associated(priv)) {
303 /* If we're associated, we clamp the maximum passive
304 * dwell time to be 98% of the beacon interval (minus
305 * 2 * channel tune time) */
306 passive = priv->beacon_int;
307 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
308 passive = IWL_PASSIVE_DWELL_BASE;
309 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
310 }
311
2a421b91
TW		 312 return passive;
313}
77fecfb8 314EXPORT_SYMBOL(iwl_get_passive_dwell_time);
2a421b91 315
afbdd69a
WYG		 316static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
317 enum ieee80211_band band,
318 struct iwl_scan_channel *scan_ch)
319{
320 const struct ieee80211_supported_band *sband;
321 const struct iwl_channel_info *ch_info;
322 u16 passive_dwell = 0;
323 u16 active_dwell = 0;
324 int i, added = 0;
325 u16 channel = 0;
326
327 sband = iwl_get_hw_mode(priv, band);
328 if (!sband) {
329 IWL_ERR(priv, "invalid band\n");
330 return added;
331 }
332
333 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
334 passive_dwell = iwl_get_passive_dwell_time(priv, band);
335
336 if (passive_dwell <= active_dwell)
337 passive_dwell = active_dwell + 1;
338
339 /* only scan single channel, good enough to reset the RF */
340 /* pick the first valid not in-use channel */
341 if (band == IEEE80211_BAND_5GHZ) {
342 for (i = 14; i < priv->channel_count; i++) {
343 if (priv->channel_info[i].channel !=
344 le16_to_cpu(priv->staging_rxon.channel)) {
345 channel = priv->channel_info[i].channel;
346 ch_info = iwl_get_channel_info(priv,
347 band, channel);
348 if (is_channel_valid(ch_info))
349 break;
350 }
351 }
352 } else {
353 for (i = 0; i < 14; i++) {
354 if (priv->channel_info[i].channel !=
355 le16_to_cpu(priv->staging_rxon.channel)) {
356 channel =
357 priv->channel_info[i].channel;
358 ch_info = iwl_get_channel_info(priv,
359 band, channel);
360 if (is_channel_valid(ch_info))
361 break;
362 }
363 }
364 }
365 if (channel) {
366 scan_ch->channel = cpu_to_le16(channel);
367 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
368 scan_ch->active_dwell = cpu_to_le16(active_dwell);
369 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
370 /* Set txpower levels to defaults */
371 scan_ch->dsp_atten = 110;
372 if (band == IEEE80211_BAND_5GHZ)
373 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
374 else
375 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
376 added++;
377 } else
378 IWL_ERR(priv, "no valid channel found\n");
379 return added;
380}
381
2a421b91
TW		 382static int iwl_get_channels_for_scan(struct iwl_priv *priv,
383 enum ieee80211_band band,
fe905f1d 384 u8 is_active, u8 n_probes,
2a421b91
TW		 385 struct iwl_scan_channel *scan_ch)
386{
4e05c234 387 struct ieee80211_channel *chan;
2a421b91
TW		 388 const struct ieee80211_supported_band *sband;
389 const struct iwl_channel_info *ch_info;
390 u16 passive_dwell = 0;
391 u16 active_dwell = 0;
392 int added, i;
d16dc48a 393 u16 channel;
2a421b91
TW		 394
395 sband = iwl_get_hw_mode(priv, band);
396 if (!sband)
397 return 0;
398
fe905f1d 399 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
2a421b91
TW		 400 passive_dwell = iwl_get_passive_dwell_time(priv, band);
401
fe905f1d
TW		 402 if (passive_dwell <= active_dwell)
403 passive_dwell = active_dwell + 1;
404
4e05c234
JB		 405 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
406 chan = priv->scan_request->channels[i];
407
408 if (chan->band != band)
2a421b91
TW		 409 continue;
410
4e05c234 411 channel = ieee80211_frequency_to_channel(chan->center_freq);
d16dc48a 412 scan_ch->channel = cpu_to_le16(channel);
2a421b91 413
d16dc48a 414 ch_info = iwl_get_channel_info(priv, band, channel);
2a421b91 415 if (!is_channel_valid(ch_info)) {
e1623446 416 IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
d16dc48a 417 channel);
2a421b91
TW		 418 continue;
419 }
420
421 if (!is_active || is_channel_passive(ch_info) ||
4e05c234 422 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
d16dc48a 423 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
2a421b91 424 else
d16dc48a 425 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
2a421b91 426
0ffe014a 427 if (n_probes)
fe905f1d 428 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
2a421b91
TW		 429
430 scan_ch->active_dwell = cpu_to_le16(active_dwell);
431 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
432
433 /* Set txpower levels to defaults */
f53696de 434 scan_ch->dsp_atten = 110;
2a421b91 435
fe905f1d
TW		 436 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
437 * power level:
438 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
439 */
2a421b91 440 if (band == IEEE80211_BAND_5GHZ)
f53696de 441 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
fe905f1d 442 else
f53696de 443 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
2a421b91 444
e1623446 445 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
fe905f1d 446 channel, le32_to_cpu(scan_ch->type),
d16dc48a
TW		 447 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
448 "ACTIVE" : "PASSIVE",
449 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
2a421b91
TW		 450 active_dwell : passive_dwell);
451
452 scan_ch++;
453 added++;
454 }
455
e1623446 456 IWL_DEBUG_SCAN(priv, "total channels to scan %d \n", added);
2a421b91
TW		 457 return added;
458}
459
f53696de
TW		 460void iwl_init_scan_params(struct iwl_priv *priv)
461{
76eff18b 462 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
f53696de 463 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
76eff18b 464 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
f53696de 465 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
76eff18b 466 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
f53696de 467}
89f186a8 468EXPORT_SYMBOL(iwl_init_scan_params);
f53696de 469
4e05c234 470static int iwl_scan_initiate(struct iwl_priv *priv)
2a421b91 471{
e1623446 472 IWL_DEBUG_INFO(priv, "Starting scan...\n");
2a421b91 473 set_bit(STATUS_SCANNING, &priv->status);
afbdd69a 474 priv->is_internal_short_scan = false;
2a421b91
TW		 475 priv->scan_start = jiffies;
476 priv->scan_pass_start = priv->scan_start;
477
478 queue_work(priv->workqueue, &priv->request_scan);
479
480 return 0;
481}
2a421b91 482
e9dde6f6
AK		 483#define IWL_DELAY_NEXT_SCAN (HZ*2)
484
485int iwl_mac_hw_scan(struct ieee80211_hw *hw,
486 struct cfg80211_scan_request *req)
487{
488 unsigned long flags;
489 struct iwl_priv *priv = hw->priv;
4e05c234 490 int ret, i;
e9dde6f6
AK		 491
492 IWL_DEBUG_MAC80211(priv, "enter\n");
493
494 mutex_lock(&priv->mutex);
495 spin_lock_irqsave(&priv->lock, flags);
496
497 if (!iwl_is_ready_rf(priv)) {
498 ret = -EIO;
499 IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n");
500 goto out_unlock;
501 }
502
bbcbb9ef
RC		 503 if (test_bit(STATUS_SCANNING, &priv->status)) {
504 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
505 ret = -EAGAIN;
506 goto out_unlock;
507 }
508
509 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
510 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
511 ret = -EAGAIN;
512 goto out_unlock;
513 }
514
e9dde6f6
AK		 515 /* We don't schedule scan within next_scan_jiffies period.
516 * Avoid scanning during possible EAPOL exchange, return
517 * success immediately.
518 */
519 if (priv->next_scan_jiffies &&
520 time_after(priv->next_scan_jiffies, jiffies)) {
521 IWL_DEBUG_SCAN(priv, "scan rejected: within next scan period\n");
522 queue_work(priv->workqueue, &priv->scan_completed);
e9dde6f6
AK		 523 ret = 0;
524 goto out_unlock;
525 }
526
4e05c234
JB		 527 priv->scan_bands = 0;
528 for (i = 0; i < req->n_channels; i++)
529 priv->scan_bands |= BIT(req->channels[i]->band);
530
1ecf9fc1 531 priv->scan_request = req;
e9dde6f6
AK		 532
533 ret = iwl_scan_initiate(priv);
534
535 IWL_DEBUG_MAC80211(priv, "leave\n");
536
537out_unlock:
538 spin_unlock_irqrestore(&priv->lock, flags);
539 mutex_unlock(&priv->mutex);
540
541 return ret;
542}
543EXPORT_SYMBOL(iwl_mac_hw_scan);
544
afbdd69a
WYG		 545/*
546 * internal short scan, this function should only been called while associated.
547 * It will reset and tune the radio to prevent possible RF related problem
548 */
549int iwl_internal_short_hw_scan(struct iwl_priv *priv)
550{
551 int ret = 0;
552
553 if (!iwl_is_ready_rf(priv)) {
554 ret = -EIO;
555 IWL_DEBUG_SCAN(priv, "not ready or exit pending\n");
556 goto out;
557 }
558 if (test_bit(STATUS_SCANNING, &priv->status)) {
559 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
560 ret = -EAGAIN;
561 goto out;
562 }
563 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
564 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
565 ret = -EAGAIN;
566 goto out;
567 }
d4d59e88 568
afbdd69a
WYG		 569 priv->scan_bands = 0;
570 if (priv->band == IEEE80211_BAND_5GHZ)
571 priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ);
572 else
573 priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ);
574
575 IWL_DEBUG_SCAN(priv, "Start internal short scan...\n");
576 set_bit(STATUS_SCANNING, &priv->status);
577 priv->is_internal_short_scan = true;
578 queue_work(priv->workqueue, &priv->request_scan);
579
580out:
581 return ret;
582}
583EXPORT_SYMBOL(iwl_internal_short_hw_scan);
584
2a421b91
TW		 585#define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
586
77fecfb8 587void iwl_bg_scan_check(struct work_struct *data)
2a421b91
TW		 588{
589 struct iwl_priv *priv =
590 container_of(data, struct iwl_priv, scan_check.work);
591
592 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
593 return;
594
595 mutex_lock(&priv->mutex);
596 if (test_bit(STATUS_SCANNING, &priv->status) ||
597 test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
e1623446 598 IWL_DEBUG_SCAN(priv, "Scan completion watchdog resetting "
2a421b91
TW		 599 "adapter (%dms)\n",
600 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
601
602 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
603 iwl_send_scan_abort(priv);
604 }
605 mutex_unlock(&priv->mutex);
606}
77fecfb8
SO		 607EXPORT_SYMBOL(iwl_bg_scan_check);
608
2a421b91
TW		 609/**
610 * iwl_fill_probe_req - fill in all required fields and IE for probe request
611 */
f53696de 612
1ecf9fc1
JB		 613u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
614 const u8 *ies, int ie_len, int left)
2a421b91
TW		 615{
616 int len = 0;
617 u8 *pos = NULL;
f53696de 618
2a421b91
TW		 619 /* Make sure there is enough space for the probe request,
620 * two mandatory IEs and the data */
621 left -= 24;
622 if (left < 0)
623 return 0;
2a421b91
TW		 624
625 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
626 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
627 memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
628 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
629 frame->seq_ctrl = 0;
630
f53696de
TW		 631 len += 24;
632
2a421b91 633 /* ...next IE... */
f53696de 634 pos = &frame->u.probe_req.variable[0];
2a421b91 635
f53696de 636 /* fill in our indirect SSID IE */
2a421b91
TW		 637 left -= 2;
638 if (left < 0)
639 return 0;
2a421b91 640 *pos++ = WLAN_EID_SSID;
21b2d8bd
SO		 641 if (!priv->is_internal_short_scan &&
642 priv->scan_request->n_ssids) {
643 struct cfg80211_ssid *ssid =
644 priv->scan_request->ssids;
645
646 /* Broadcast if ssid_len is 0 */
647 *pos++ = ssid->ssid_len;
648 memcpy(pos, ssid->ssid, ssid->ssid_len);
649 pos += ssid->ssid_len;
650 len += 2 + ssid->ssid_len;
651 } else {
652 *pos++ = 0;
653 len += 2;
654 }
2a421b91 655
1ecf9fc1
JB		 656 if (WARN_ON(left < ie_len))
657 return len;
2a421b91 658
afbdd69a
WYG		 659 if (ies)
660 memcpy(pos, ies, ie_len);
1ecf9fc1
JB		 661 len += ie_len;
662 left -= ie_len;
f53696de 663
2a421b91
TW		 664 return (u16)len;
665}
77fecfb8 666EXPORT_SYMBOL(iwl_fill_probe_req);
2a421b91
TW		 667
668static void iwl_bg_request_scan(struct work_struct *data)
669{
670 struct iwl_priv *priv =
671 container_of(data, struct iwl_priv, request_scan);
672 struct iwl_host_cmd cmd = {
673 .id = REPLY_SCAN_CMD,
674 .len = sizeof(struct iwl_scan_cmd),
c2acea8e 675 .flags = CMD_SIZE_HUGE,
2a421b91
TW		 676 };
677 struct iwl_scan_cmd *scan;
678 struct ieee80211_conf *conf = NULL;
f53696de 679 int ret = 0;
76eff18b 680 u32 rate_flags = 0;
2a421b91 681 u16 cmd_len;
fff7a434 682 u16 rx_chain = 0;
2a421b91 683 enum ieee80211_band band;
1ecf9fc1 684 u8 n_probes = 0;
fff7a434 685 u8 rx_ant = priv->hw_params.valid_rx_ant;
76eff18b 686 u8 rate;
1ecf9fc1 687 bool is_active = false;
a2b0f02e 688 int chan_mod;
f1e3d7d4 689 u8 active_chains;
2a421b91
TW		 690
691 conf = ieee80211_get_hw_conf(priv->hw);
692
693 mutex_lock(&priv->mutex);
694
fbc9f97b
RC		 695 cancel_delayed_work(&priv->scan_check);
696
2a421b91 697 if (!iwl_is_ready(priv)) {
39aadf8c 698 IWL_WARN(priv, "request scan called when driver not ready.\n");
2a421b91
TW		 699 goto done;
700 }
701
a96a27f9 702 /* Make sure the scan wasn't canceled before this queued work
2a421b91
TW		 703 * was given the chance to run... */
704 if (!test_bit(STATUS_SCANNING, &priv->status))
705 goto done;
706
707 /* This should never be called or scheduled if there is currently
708 * a scan active in the hardware. */
709 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
e1623446 710 IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. "
2a421b91
TW		 711 "Ignoring second request.\n");
712 ret = -EIO;
713 goto done;
714 }
715
716 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
e1623446 717 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
2a421b91
TW		 718 goto done;
719 }
720
721 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
e1623446 722 IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n");
2a421b91
TW		 723 goto done;
724 }
725
726 if (iwl_is_rfkill(priv)) {
e1623446 727 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
2a421b91
TW		 728 goto done;
729 }
730
731 if (!test_bit(STATUS_READY, &priv->status)) {
e1623446 732 IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n");
2a421b91
TW		 733 goto done;
734 }
735
736 if (!priv->scan_bands) {
e1623446 737 IWL_DEBUG_HC(priv, "Aborting scan due to no requested bands\n");
2a421b91
TW		 738 goto done;
739 }
740
741 if (!priv->scan) {
742 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
743 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
744 if (!priv->scan) {
745 ret = -ENOMEM;
746 goto done;
747 }
748 }
749 scan = priv->scan;
750 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
751
752 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
753 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
754
755 if (iwl_is_associated(priv)) {
756 u16 interval = 0;
757 u32 extra;
758 u32 suspend_time = 100;
759 u32 scan_suspend_time = 100;
760 unsigned long flags;
761
e1623446 762 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
2a421b91
TW		 763 spin_lock_irqsave(&priv->lock, flags);
764 interval = priv->beacon_int;
765 spin_unlock_irqrestore(&priv->lock, flags);
766
767 scan->suspend_time = 0;
768 scan->max_out_time = cpu_to_le32(200 * 1024);
769 if (!interval)
770 interval = suspend_time;
771
772 extra = (suspend_time / interval) << 22;
773 scan_suspend_time = (extra |
774 ((suspend_time % interval) * 1024));
775 scan->suspend_time = cpu_to_le32(scan_suspend_time);
e1623446 776 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
2a421b91
TW		 777 scan_suspend_time, interval);
778 }
779
afbdd69a
WYG		 780 if (priv->is_internal_short_scan) {
781 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
782 } else if (priv->scan_request->n_ssids) {
1ecf9fc1 783 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
21b2d8bd
SO		 784 /*
785 * The first SSID to scan is stuffed into the probe request
786 * template and the remaining ones are handled through the
787 * direct_scan array.
788 */
789 if (priv->scan_request->n_ssids > 1) {
790 int i, p = 0;
791 for (i = 1; i < priv->scan_request->n_ssids; i++) {
792 if (!priv->scan_request->ssids[i].ssid_len)
793 continue;
794 scan->direct_scan[p].id = WLAN_EID_SSID;
795 scan->direct_scan[p].len =
796 priv->scan_request->ssids[i].ssid_len;
797 memcpy(scan->direct_scan[p].ssid,
798 priv->scan_request->ssids[i].ssid,
799 priv->scan_request->ssids[i].ssid_len);
800 n_probes++;
801 p++;
802 }
1ecf9fc1
JB		 803 }
804 is_active = true;
805 } else
806 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
2a421b91
TW		 807
808 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
809 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
810 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
811
812
1b63ba8a 813 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
f53696de 814 band = IEEE80211_BAND_2GHZ;
2a421b91 815 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
a2b0f02e
WYG		 816 chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK)
817 >> RXON_FLG_CHANNEL_MODE_POS;
818 if (chan_mod == CHANNEL_MODE_PURE_40) {
76eff18b
TW		 819 rate = IWL_RATE_6M_PLCP;
820 } else {
821 rate = IWL_RATE_1M_PLCP;
822 rate_flags = RATE_MCS_CCK_MSK;
823 }
2a421b91 824 scan->good_CRC_th = 0;
1b63ba8a 825 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
f53696de 826 band = IEEE80211_BAND_5GHZ;
76eff18b 827 rate = IWL_RATE_6M_PLCP;
b097ad29
JB		 828 /*
829 * If active scaning is requested but a certain channel
830 * is marked passive, we can do active scanning if we
831 * detect transmissions.
832 */
833 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH : 0;
2a421b91 834
f53696de
TW		 835 /* Force use of chains B and C (0x6) for scan Rx for 4965
836 * Avoid A (0x1) because of its off-channel reception on A-band.
5118303f 837 */
f53696de 838 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
fff7a434 839 rx_ant = ANT_BC;
1b63ba8a 840 } else {
39aadf8c 841 IWL_WARN(priv, "Invalid scan band count\n");
2a421b91
TW		 842 goto done;
843 }
844
76eff18b
TW		 845 priv->scan_tx_ant[band] =
846 iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]);
847 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
848 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
849
f1e3d7d4
SZ		 850 /* In power save mode use one chain, otherwise use all chains */
851 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
852 /* rx_ant has been set to all valid chains previously */
853 active_chains = rx_ant &
854 ((u8)(priv->chain_noise_data.active_chains));
855 if (!active_chains)
856 active_chains = rx_ant;
857
858 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
859 priv->chain_noise_data.active_chains);
860
861 rx_ant = first_antenna(active_chains);
862 }
5118303f 863 /* MIMO is not used here, but value is required */
b23aa883 864 rx_chain |= priv->hw_params.valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
f1e3d7d4 865 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
fff7a434
WYG		 866 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
867 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
868 scan->rx_chain = cpu_to_le16(rx_chain);
afbdd69a
WYG		 869 if (!priv->is_internal_short_scan) {
870 cmd_len = iwl_fill_probe_req(priv,
871 (struct ieee80211_mgmt *)scan->data,
872 priv->scan_request->ie,
873 priv->scan_request->ie_len,
874 IWL_MAX_SCAN_SIZE - sizeof(*scan));
875 } else {
876 cmd_len = iwl_fill_probe_req(priv,
877 (struct ieee80211_mgmt *)scan->data,
878 NULL, 0,
879 IWL_MAX_SCAN_SIZE - sizeof(*scan));
2a421b91 880
afbdd69a 881 }
2a421b91 882 scan->tx_cmd.len = cpu_to_le16(cmd_len);
279b05d4 883 if (iwl_is_monitor_mode(priv))
2a421b91
TW		 884 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
885
f53696de
TW		 886 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
887 RXON_FILTER_BCON_AWARE_MSK);
888
afbdd69a
WYG		 889 if (priv->is_internal_short_scan) {
890 scan->channel_count =
891 iwl_get_single_channel_for_scan(priv, band,
892 (void *)&scan->data[le16_to_cpu(
893 scan->tx_cmd.len)]);
894 } else {
895 scan->channel_count =
896 iwl_get_channels_for_scan(priv, band,
897 is_active, n_probes,
898 (void *)&scan->data[le16_to_cpu(
899 scan->tx_cmd.len)]);
900 }
f53696de 901 if (scan->channel_count == 0) {
e1623446 902 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
f53696de
TW		 903 goto done;
904 }
2a421b91 905
2a421b91
TW		 906 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
907 scan->channel_count * sizeof(struct iwl_scan_channel);
908 cmd.data = scan;
909 scan->len = cpu_to_le16(cmd.len);
910
911 set_bit(STATUS_SCAN_HW, &priv->status);
912 ret = iwl_send_cmd_sync(priv, &cmd);
913 if (ret)
914 goto done;
915
916 queue_delayed_work(priv->workqueue, &priv->scan_check,
917 IWL_SCAN_CHECK_WATCHDOG);
918
919 mutex_unlock(&priv->mutex);
920 return;
921
922 done:
951891c7
MA		 923 /* Cannot perform scan. Make sure we clear scanning
924 * bits from status so next scan request can be performed.
925 * If we don't clear scanning status bit here all next scan
926 * will fail
927 */
928 clear_bit(STATUS_SCAN_HW, &priv->status);
929 clear_bit(STATUS_SCANNING, &priv->status);
2a421b91
TW		 930 /* inform mac80211 scan aborted */
931 queue_work(priv->workqueue, &priv->scan_completed);
932 mutex_unlock(&priv->mutex);
933}
934
77fecfb8 935void iwl_bg_abort_scan(struct work_struct *work)
2a421b91
TW		 936{
937 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
938
5bddf549
WYG		 939 if (!test_bit(STATUS_READY, &priv->status) ||
940 !test_bit(STATUS_GEO_CONFIGURED, &priv->status))
2a421b91
TW		 941 return;
942
943 mutex_lock(&priv->mutex);
944
945 set_bit(STATUS_SCAN_ABORTING, &priv->status);
946 iwl_send_scan_abort(priv);
947
948 mutex_unlock(&priv->mutex);
949}
77fecfb8 950EXPORT_SYMBOL(iwl_bg_abort_scan);
2a421b91 951
77fecfb8 952void iwl_bg_scan_completed(struct work_struct *work)
eedda367
TW		 953{
954 struct iwl_priv *priv =
955 container_of(work, struct iwl_priv, scan_completed);
956
e1623446 957 IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
eedda367 958
fbc9f97b
RC		 959 cancel_delayed_work(&priv->scan_check);
960
afbdd69a
WYG		 961 if (!priv->is_internal_short_scan)
962 ieee80211_scan_completed(priv->hw, false);
963 else {
964 priv->is_internal_short_scan = false;
965 IWL_DEBUG_SCAN(priv, "internal short scan completed\n");
966 }
74aa9be0 967
eedda367
TW		 968 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
969 return;
970
eedda367
TW		 971 /* Since setting the TXPOWER may have been deferred while
972 * performing the scan, fire one off */
973 mutex_lock(&priv->mutex);
974 iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
975 mutex_unlock(&priv->mutex);
976}
77fecfb8 977EXPORT_SYMBOL(iwl_bg_scan_completed);
eedda367 978
2a421b91
TW		 979void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
980{
eedda367 981 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
2a421b91
TW		 982 INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
983 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
984 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
985}
986EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
987
Linux kernel - Deliverables
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