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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6-block.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 *****************************************************************************/
5a0e3ad6 28#include <linux/slab.h>
7e272fcf 29#include <linux/types.h>
2a421b91 30#include <linux/etherdevice.h>
7e272fcf 31#include <net/mac80211.h>
2a421b91
TW		 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
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. */
fe905f1d
TW		 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)
2a421b91 48
2a421b91
TW		 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
fe905f1d
TW		 57
58
2a421b91
TW		 59/**
60 * iwl_scan_cancel - Cancel any currently executing HW scan
61 *
62 * NOTE: priv->mutex is not required before calling this function
63 */
64int iwl_scan_cancel(struct iwl_priv *priv)
65{
66 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
67 clear_bit(STATUS_SCANNING, &priv->status);
68 return 0;
69 }
70
71 if (test_bit(STATUS_SCANNING, &priv->status)) {
72 if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
e1623446 73 IWL_DEBUG_SCAN(priv, "Queuing scan abort.\n");
2a421b91
TW		 74 set_bit(STATUS_SCAN_ABORTING, &priv->status);
75 queue_work(priv->workqueue, &priv->abort_scan);
76
77 } else
e1623446 78 IWL_DEBUG_SCAN(priv, "Scan abort already in progress.\n");
2a421b91
TW		 79
80 return test_bit(STATUS_SCANNING, &priv->status);
81 }
82
83 return 0;
84}
85EXPORT_SYMBOL(iwl_scan_cancel);
86/**
87 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
88 * @ms: amount of time to wait (in milliseconds) for scan to abort
89 *
90 * NOTE: priv->mutex must be held before calling this function
91 */
92int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
93{
94 unsigned long now = jiffies;
95 int ret;
96
97 ret = iwl_scan_cancel(priv);
98 if (ret && ms) {
99 mutex_unlock(&priv->mutex);
100 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
101 test_bit(STATUS_SCANNING, &priv->status))
102 msleep(1);
103 mutex_lock(&priv->mutex);
104
105 return test_bit(STATUS_SCANNING, &priv->status);
106 }
107
108 return ret;
109}
110EXPORT_SYMBOL(iwl_scan_cancel_timeout);
111
4e05c234 112static int iwl_send_scan_abort(struct iwl_priv *priv)
2a421b91
TW		 113{
114 int ret = 0;
2f301227 115 struct iwl_rx_packet *pkt;
2a421b91
TW		 116 struct iwl_host_cmd cmd = {
117 .id = REPLY_SCAN_ABORT_CMD,
c2acea8e 118 .flags = CMD_WANT_SKB,
2a421b91
TW		 119 };
120
121 /* If there isn't a scan actively going on in the hardware
122 * then we are in between scan bands and not actually
123 * actively scanning, so don't send the abort command */
124 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
125 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
126 return 0;
127 }
128
129 ret = iwl_send_cmd_sync(priv, &cmd);
130 if (ret) {
131 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
132 return ret;
133 }
134
2f301227
ZY		 135 pkt = (struct iwl_rx_packet *)cmd.reply_page;
136 if (pkt->u.status != CAN_ABORT_STATUS) {
2a421b91
TW		 137 /* The scan abort will return 1 for success or
138 * 2 for "failure". A failure condition can be
139 * due to simply not being in an active scan which
140 * can occur if we send the scan abort before we
141 * the microcode has notified us that a scan is
142 * completed. */
2f301227 143 IWL_DEBUG_INFO(priv, "SCAN_ABORT returned %d.\n", pkt->u.status);
2a421b91
TW		 144 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
145 clear_bit(STATUS_SCAN_HW, &priv->status);
146 }
147
64a76b50 148 iwl_free_pages(priv, cmd.reply_page);
2a421b91
TW		 149
150 return ret;
151}
2a421b91
TW		 152
153/* Service response to REPLY_SCAN_CMD (0x80) */
154static void iwl_rx_reply_scan(struct iwl_priv *priv,
155 struct iwl_rx_mem_buffer *rxb)
156{
157#ifdef CONFIG_IWLWIFI_DEBUG
2f301227 158 struct iwl_rx_packet *pkt = rxb_addr(rxb);
2a421b91
TW		 159 struct iwl_scanreq_notification *notif =
160 (struct iwl_scanreq_notification *)pkt->u.raw;
161
e1623446 162 IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
2a421b91
TW		 163#endif
164}
165
166/* Service SCAN_START_NOTIFICATION (0x82) */
167static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
168 struct iwl_rx_mem_buffer *rxb)
169{
2f301227 170 struct iwl_rx_packet *pkt = rxb_addr(rxb);
2a421b91
TW		 171 struct iwl_scanstart_notification *notif =
172 (struct iwl_scanstart_notification *)pkt->u.raw;
173 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
e1623446 174 IWL_DEBUG_SCAN(priv, "Scan start: "
2a421b91
TW		 175 "%d [802.11%s] "
176 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
177 notif->channel,
178 notif->band ? "bg" : "a",
fe905f1d
TW		 179 le32_to_cpu(notif->tsf_high),
180 le32_to_cpu(notif->tsf_low),
181 notif->status, notif->beacon_timer);
2a421b91
TW		 182}
183
184/* Service SCAN_RESULTS_NOTIFICATION (0x83) */
185static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
186 struct iwl_rx_mem_buffer *rxb)
187{
188#ifdef CONFIG_IWLWIFI_DEBUG
2f301227 189 struct iwl_rx_packet *pkt = rxb_addr(rxb);
2a421b91
TW		 190 struct iwl_scanresults_notification *notif =
191 (struct iwl_scanresults_notification *)pkt->u.raw;
192
e1623446 193 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
2a421b91
TW		 194 "%d [802.11%s] "
195 "(TSF: 0x%08X:%08X) - %d "
220575f7 196 "elapsed=%lu usec\n",
2a421b91
TW		 197 notif->channel,
198 notif->band ? "bg" : "a",
199 le32_to_cpu(notif->tsf_high),
200 le32_to_cpu(notif->tsf_low),
201 le32_to_cpu(notif->statistics[0]),
220575f7 202 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
2a421b91
TW		 203#endif
204
d4d59e88
WYG		 205 if (!priv->is_internal_short_scan)
206 priv->next_scan_jiffies = 0;
2a421b91
TW		 207}
208
209/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
210static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
211 struct iwl_rx_mem_buffer *rxb)
212{
cb9289cb 213#ifdef CONFIG_IWLWIFI_DEBUG
2f301227 214 struct iwl_rx_packet *pkt = rxb_addr(rxb);
2a421b91
TW		 215 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
216
e1623446 217 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
2a421b91
TW		 218 scan_notif->scanned_channels,
219 scan_notif->tsf_low,
220 scan_notif->tsf_high, scan_notif->status);
cb9289cb 221#endif
2a421b91
TW		 222
223 /* The HW is no longer scanning */
224 clear_bit(STATUS_SCAN_HW, &priv->status);
225
e1623446 226 IWL_DEBUG_INFO(priv, "Scan pass on %sGHz took %dms\n",
1b63ba8a
DM		 227 (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
228 "2.4" : "5.2",
2a421b91
TW		 229 jiffies_to_msecs(elapsed_jiffies
230 (priv->scan_pass_start, jiffies)));
231
1b63ba8a
DM		 232 /* Remove this scanned band from the list of pending
233 * bands to scan, band G precedes A in order of scanning
234 * as seen in iwl_bg_request_scan */
235 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
236 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
237 else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ))
238 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
2a421b91
TW		 239
240 /* If a request to abort was given, or the scan did not succeed
241 * then we reset the scan state machine and terminate,
242 * re-queuing another scan if one has been requested */
243 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
e1623446 244 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
2a421b91
TW		 245 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
246 } else {
247 /* If there are more bands on this scan pass reschedule */
1b63ba8a 248 if (priv->scan_bands)
2a421b91
TW		 249 goto reschedule;
250 }
251
d4d59e88
WYG		 252 if (!priv->is_internal_short_scan)
253 priv->next_scan_jiffies = 0;
d4d59e88 254
e1623446 255 IWL_DEBUG_INFO(priv, "Setting scan to off\n");
2a421b91
TW		 256
257 clear_bit(STATUS_SCANNING, &priv->status);
258
e1623446 259 IWL_DEBUG_INFO(priv, "Scan took %dms\n",
2a421b91
TW		 260 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
261
262 queue_work(priv->workqueue, &priv->scan_completed);
263
264 return;
265
266reschedule:
267 priv->scan_pass_start = jiffies;
268 queue_work(priv->workqueue, &priv->request_scan);
269}
270
271void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
272{
273 /* scan handlers */
274 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
275 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
276 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
277 iwl_rx_scan_results_notif;
278 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
279 iwl_rx_scan_complete_notif;
280}
281EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
282
77fecfb8
SO		 283inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
284 enum ieee80211_band band,
285 u8 n_probes)
2a421b91
TW		 286{
287 if (band == IEEE80211_BAND_5GHZ)
fe905f1d
TW		 288 return IWL_ACTIVE_DWELL_TIME_52 +
289 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
2a421b91 290 else
fe905f1d
TW		 291 return IWL_ACTIVE_DWELL_TIME_24 +
292 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
2a421b91 293}
77fecfb8 294EXPORT_SYMBOL(iwl_get_active_dwell_time);
2a421b91 295
77fecfb8
SO		 296u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
297 enum ieee80211_band band)
2a421b91 298{
fe905f1d 299 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
2a421b91
TW		 300 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
301 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
302
303 if (iwl_is_associated(priv)) {
304 /* If we're associated, we clamp the maximum passive
305 * dwell time to be 98% of the beacon interval (minus
306 * 2 * channel tune time) */
307 passive = priv->beacon_int;
308 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
309 passive = IWL_PASSIVE_DWELL_BASE;
310 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
311 }
312
2a421b91
TW		 313 return passive;
314}
77fecfb8 315EXPORT_SYMBOL(iwl_get_passive_dwell_time);
2a421b91 316
afbdd69a
WYG		 317static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
318 enum ieee80211_band band,
319 struct iwl_scan_channel *scan_ch)
320{
321 const struct ieee80211_supported_band *sband;
322 const struct iwl_channel_info *ch_info;
323 u16 passive_dwell = 0;
324 u16 active_dwell = 0;
325 int i, added = 0;
326 u16 channel = 0;
327
328 sband = iwl_get_hw_mode(priv, band);
329 if (!sband) {
330 IWL_ERR(priv, "invalid band\n");
331 return added;
332 }
333
334 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
335 passive_dwell = iwl_get_passive_dwell_time(priv, band);
336
337 if (passive_dwell <= active_dwell)
338 passive_dwell = active_dwell + 1;
339
340 /* only scan single channel, good enough to reset the RF */
341 /* pick the first valid not in-use channel */
342 if (band == IEEE80211_BAND_5GHZ) {
343 for (i = 14; i < priv->channel_count; i++) {
344 if (priv->channel_info[i].channel !=
345 le16_to_cpu(priv->staging_rxon.channel)) {
346 channel = priv->channel_info[i].channel;
347 ch_info = iwl_get_channel_info(priv,
348 band, channel);
349 if (is_channel_valid(ch_info))
350 break;
351 }
352 }
353 } else {
354 for (i = 0; i < 14; i++) {
355 if (priv->channel_info[i].channel !=
356 le16_to_cpu(priv->staging_rxon.channel)) {
357 channel =
358 priv->channel_info[i].channel;
359 ch_info = iwl_get_channel_info(priv,
360 band, channel);
361 if (is_channel_valid(ch_info))
362 break;
363 }
364 }
365 }
366 if (channel) {
367 scan_ch->channel = cpu_to_le16(channel);
368 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
369 scan_ch->active_dwell = cpu_to_le16(active_dwell);
370 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
371 /* Set txpower levels to defaults */
372 scan_ch->dsp_atten = 110;
373 if (band == IEEE80211_BAND_5GHZ)
374 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
375 else
376 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
377 added++;
378 } else
379 IWL_ERR(priv, "no valid channel found\n");
380 return added;
381}
382
2a421b91
TW		 383static int iwl_get_channels_for_scan(struct iwl_priv *priv,
384 enum ieee80211_band band,
fe905f1d 385 u8 is_active, u8 n_probes,
2a421b91
TW		 386 struct iwl_scan_channel *scan_ch)
387{
4e05c234 388 struct ieee80211_channel *chan;
2a421b91
TW		 389 const struct ieee80211_supported_band *sband;
390 const struct iwl_channel_info *ch_info;
391 u16 passive_dwell = 0;
392 u16 active_dwell = 0;
393 int added, i;
d16dc48a 394 u16 channel;
2a421b91
TW		 395
396 sband = iwl_get_hw_mode(priv, band);
397 if (!sband)
398 return 0;
399
fe905f1d 400 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
2a421b91
TW		 401 passive_dwell = iwl_get_passive_dwell_time(priv, band);
402
fe905f1d
TW		 403 if (passive_dwell <= active_dwell)
404 passive_dwell = active_dwell + 1;
405
4e05c234
JB		 406 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
407 chan = priv->scan_request->channels[i];
408
409 if (chan->band != band)
2a421b91
TW		 410 continue;
411
4e05c234 412 channel = ieee80211_frequency_to_channel(chan->center_freq);
d16dc48a 413 scan_ch->channel = cpu_to_le16(channel);
2a421b91 414
d16dc48a 415 ch_info = iwl_get_channel_info(priv, band, channel);
2a421b91 416 if (!is_channel_valid(ch_info)) {
e1623446 417 IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
d16dc48a 418 channel);
2a421b91
TW		 419 continue;
420 }
421
422 if (!is_active || is_channel_passive(ch_info) ||
4e05c234 423 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
d16dc48a 424 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
2a421b91 425 else
d16dc48a 426 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
2a421b91 427
0ffe014a 428 if (n_probes)
fe905f1d 429 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
2a421b91
TW		 430
431 scan_ch->active_dwell = cpu_to_le16(active_dwell);
432 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
433
434 /* Set txpower levels to defaults */
f53696de 435 scan_ch->dsp_atten = 110;
2a421b91 436
fe905f1d
TW		 437 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
438 * power level:
439 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
440 */
2a421b91 441 if (band == IEEE80211_BAND_5GHZ)
f53696de 442 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
fe905f1d 443 else
f53696de 444 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
2a421b91 445
e1623446 446 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
fe905f1d 447 channel, le32_to_cpu(scan_ch->type),
d16dc48a
TW		 448 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
449 "ACTIVE" : "PASSIVE",
450 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
2a421b91
TW		 451 active_dwell : passive_dwell);
452
453 scan_ch++;
454 added++;
455 }
456
e1623446 457 IWL_DEBUG_SCAN(priv, "total channels to scan %d \n", added);
2a421b91
TW		 458 return added;
459}
460
f53696de
TW		 461void iwl_init_scan_params(struct iwl_priv *priv)
462{
76eff18b 463 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
f53696de 464 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
76eff18b 465 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
f53696de 466 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
76eff18b 467 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
f53696de 468}
89f186a8 469EXPORT_SYMBOL(iwl_init_scan_params);
f53696de 470
4e05c234 471static int iwl_scan_initiate(struct iwl_priv *priv)
2a421b91 472{
88be0264
JB		 473 WARN_ON(!mutex_is_locked(&priv->mutex));
474
e1623446 475 IWL_DEBUG_INFO(priv, "Starting scan...\n");
2a421b91 476 set_bit(STATUS_SCANNING, &priv->status);
afbdd69a 477 priv->is_internal_short_scan = false;
2a421b91
TW		 478 priv->scan_start = jiffies;
479 priv->scan_pass_start = priv->scan_start;
480
481 queue_work(priv->workqueue, &priv->request_scan);
482
483 return 0;
484}
2a421b91 485
e9dde6f6
AK		 486#define IWL_DELAY_NEXT_SCAN (HZ*2)
487
488int iwl_mac_hw_scan(struct ieee80211_hw *hw,
489 struct cfg80211_scan_request *req)
490{
491 unsigned long flags;
492 struct iwl_priv *priv = hw->priv;
4e05c234 493 int ret, i;
e9dde6f6
AK		 494
495 IWL_DEBUG_MAC80211(priv, "enter\n");
496
497 mutex_lock(&priv->mutex);
498 spin_lock_irqsave(&priv->lock, flags);
499
500 if (!iwl_is_ready_rf(priv)) {
501 ret = -EIO;
502 IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n");
503 goto out_unlock;
504 }
505
bbcbb9ef
RC		 506 if (test_bit(STATUS_SCANNING, &priv->status)) {
507 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
508 ret = -EAGAIN;
509 goto out_unlock;
510 }
511
512 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
513 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
514 ret = -EAGAIN;
515 goto out_unlock;
516 }
517
e9dde6f6
AK		 518 /* We don't schedule scan within next_scan_jiffies period.
519 * Avoid scanning during possible EAPOL exchange, return
520 * success immediately.
521 */
522 if (priv->next_scan_jiffies &&
523 time_after(priv->next_scan_jiffies, jiffies)) {
524 IWL_DEBUG_SCAN(priv, "scan rejected: within next scan period\n");
525 queue_work(priv->workqueue, &priv->scan_completed);
e9dde6f6
AK		 526 ret = 0;
527 goto out_unlock;
528 }
529
4e05c234
JB		 530 priv->scan_bands = 0;
531 for (i = 0; i < req->n_channels; i++)
532 priv->scan_bands |= BIT(req->channels[i]->band);
533
1ecf9fc1 534 priv->scan_request = req;
e9dde6f6
AK		 535
536 ret = iwl_scan_initiate(priv);
537
538 IWL_DEBUG_MAC80211(priv, "leave\n");
539
540out_unlock:
541 spin_unlock_irqrestore(&priv->lock, flags);
542 mutex_unlock(&priv->mutex);
543
544 return ret;
545}
546EXPORT_SYMBOL(iwl_mac_hw_scan);
547
afbdd69a
WYG		 548/*
549 * internal short scan, this function should only been called while associated.
550 * It will reset and tune the radio to prevent possible RF related problem
551 */
88be0264 552void iwl_internal_short_hw_scan(struct iwl_priv *priv)
afbdd69a 553{
88be0264
JB		 554 queue_work(priv->workqueue, &priv->start_internal_scan);
555}
556
557static void iwl_bg_start_internal_scan(struct work_struct *work)
558{
559 struct iwl_priv *priv =
560 container_of(work, struct iwl_priv, start_internal_scan);
561
562 mutex_lock(&priv->mutex);
afbdd69a
WYG		 563
564 if (!iwl_is_ready_rf(priv)) {
afbdd69a 565 IWL_DEBUG_SCAN(priv, "not ready or exit pending\n");
88be0264 566 goto unlock;
afbdd69a 567 }
88be0264 568
afbdd69a
WYG		 569 if (test_bit(STATUS_SCANNING, &priv->status)) {
570 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
88be0264 571 goto unlock;
afbdd69a 572 }
88be0264 573
afbdd69a
WYG		 574 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
575 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
88be0264 576 goto unlock;
afbdd69a 577 }
d4d59e88 578
afbdd69a
WYG		 579 priv->scan_bands = 0;
580 if (priv->band == IEEE80211_BAND_5GHZ)
581 priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ);
582 else
583 priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ);
584
585 IWL_DEBUG_SCAN(priv, "Start internal short scan...\n");
586 set_bit(STATUS_SCANNING, &priv->status);
587 priv->is_internal_short_scan = true;
588 queue_work(priv->workqueue, &priv->request_scan);
88be0264
JB		 589 unlock:
590 mutex_unlock(&priv->mutex);
afbdd69a
WYG		 591}
592EXPORT_SYMBOL(iwl_internal_short_hw_scan);
593
2a421b91
TW		 594#define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
595
77fecfb8 596void iwl_bg_scan_check(struct work_struct *data)
2a421b91
TW		 597{
598 struct iwl_priv *priv =
599 container_of(data, struct iwl_priv, scan_check.work);
600
601 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
602 return;
603
604 mutex_lock(&priv->mutex);
605 if (test_bit(STATUS_SCANNING, &priv->status) ||
606 test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
e1623446 607 IWL_DEBUG_SCAN(priv, "Scan completion watchdog resetting "
2a421b91
TW		 608 "adapter (%dms)\n",
609 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
610
611 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
612 iwl_send_scan_abort(priv);
613 }
614 mutex_unlock(&priv->mutex);
615}
77fecfb8
SO		 616EXPORT_SYMBOL(iwl_bg_scan_check);
617
2a421b91
TW		 618/**
619 * iwl_fill_probe_req - fill in all required fields and IE for probe request
620 */
f53696de 621
1ecf9fc1
JB		 622u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
623 const u8 *ies, int ie_len, int left)
2a421b91
TW		 624{
625 int len = 0;
626 u8 *pos = NULL;
f53696de 627
2a421b91
TW		 628 /* Make sure there is enough space for the probe request,
629 * two mandatory IEs and the data */
630 left -= 24;
631 if (left < 0)
632 return 0;
2a421b91
TW		 633
634 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
635 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
636 memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
637 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
638 frame->seq_ctrl = 0;
639
f53696de
TW		 640 len += 24;
641
2a421b91 642 /* ...next IE... */
f53696de 643 pos = &frame->u.probe_req.variable[0];
2a421b91 644
f53696de 645 /* fill in our indirect SSID IE */
2a421b91
TW		 646 left -= 2;
647 if (left < 0)
648 return 0;
2a421b91 649 *pos++ = WLAN_EID_SSID;
1382c71c
RC		 650 *pos++ = 0;
651
652 len += 2;
2a421b91 653
1ecf9fc1
JB		 654 if (WARN_ON(left < ie_len))
655 return len;
2a421b91 656
afbdd69a
WYG		 657 if (ies)
658 memcpy(pos, ies, ie_len);
1ecf9fc1
JB		 659 len += ie_len;
660 left -= ie_len;
f53696de 661
2a421b91
TW		 662 return (u16)len;
663}
77fecfb8 664EXPORT_SYMBOL(iwl_fill_probe_req);
2a421b91
TW		 665
666static void iwl_bg_request_scan(struct work_struct *data)
667{
668 struct iwl_priv *priv =
669 container_of(data, struct iwl_priv, request_scan);
670 struct iwl_host_cmd cmd = {
671 .id = REPLY_SCAN_CMD,
672 .len = sizeof(struct iwl_scan_cmd),
c2acea8e 673 .flags = CMD_SIZE_HUGE,
2a421b91
TW		 674 };
675 struct iwl_scan_cmd *scan;
676 struct ieee80211_conf *conf = NULL;
f53696de 677 int ret = 0;
76eff18b 678 u32 rate_flags = 0;
2a421b91 679 u16 cmd_len;
fff7a434 680 u16 rx_chain = 0;
2a421b91 681 enum ieee80211_band band;
1ecf9fc1 682 u8 n_probes = 0;
fff7a434 683 u8 rx_ant = priv->hw_params.valid_rx_ant;
76eff18b 684 u8 rate;
1ecf9fc1 685 bool is_active = false;
a2b0f02e 686 int chan_mod;
f1e3d7d4 687 u8 active_chains;
2a421b91
TW		 688
689 conf = ieee80211_get_hw_conf(priv->hw);
690
691 mutex_lock(&priv->mutex);
692
fbc9f97b
RC		 693 cancel_delayed_work(&priv->scan_check);
694
2a421b91 695 if (!iwl_is_ready(priv)) {
39aadf8c 696 IWL_WARN(priv, "request scan called when driver not ready.\n");
2a421b91
TW		 697 goto done;
698 }
699
a96a27f9 700 /* Make sure the scan wasn't canceled before this queued work
2a421b91
TW		 701 * was given the chance to run... */
702 if (!test_bit(STATUS_SCANNING, &priv->status))
703 goto done;
704
705 /* This should never be called or scheduled if there is currently
706 * a scan active in the hardware. */
707 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
e1623446 708 IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. "
2a421b91
TW		 709 "Ignoring second request.\n");
710 ret = -EIO;
711 goto done;
712 }
713
714 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
e1623446 715 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
2a421b91
TW		 716 goto done;
717 }
718
719 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
e1623446 720 IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n");
2a421b91
TW		 721 goto done;
722 }
723
724 if (iwl_is_rfkill(priv)) {
e1623446 725 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
2a421b91
TW		 726 goto done;
727 }
728
729 if (!test_bit(STATUS_READY, &priv->status)) {
e1623446 730 IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n");
2a421b91
TW		 731 goto done;
732 }
733
734 if (!priv->scan_bands) {
e1623446 735 IWL_DEBUG_HC(priv, "Aborting scan due to no requested bands\n");
2a421b91
TW		 736 goto done;
737 }
738
739 if (!priv->scan) {
740 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
741 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
742 if (!priv->scan) {
743 ret = -ENOMEM;
744 goto done;
745 }
746 }
747 scan = priv->scan;
748 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
749
750 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
751 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
752
753 if (iwl_is_associated(priv)) {
754 u16 interval = 0;
755 u32 extra;
756 u32 suspend_time = 100;
757 u32 scan_suspend_time = 100;
758 unsigned long flags;
759
e1623446 760 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
2a421b91
TW		 761 spin_lock_irqsave(&priv->lock, flags);
762 interval = priv->beacon_int;
763 spin_unlock_irqrestore(&priv->lock, flags);
764
765 scan->suspend_time = 0;
766 scan->max_out_time = cpu_to_le32(200 * 1024);
767 if (!interval)
768 interval = suspend_time;
769
770 extra = (suspend_time / interval) << 22;
771 scan_suspend_time = (extra |
772 ((suspend_time % interval) * 1024));
773 scan->suspend_time = cpu_to_le32(scan_suspend_time);
e1623446 774 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
2a421b91
TW		 775 scan_suspend_time, interval);
776 }
777
afbdd69a
WYG		 778 if (priv->is_internal_short_scan) {
779 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
780 } else if (priv->scan_request->n_ssids) {
1382c71c 781 int i, p = 0;
1ecf9fc1 782 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
1382c71c
RC		 783 for (i = 0; i < priv->scan_request->n_ssids; i++) {
784 /* always does wildcard anyway */
785 if (!priv->scan_request->ssids[i].ssid_len)
786 continue;
787 scan->direct_scan[p].id = WLAN_EID_SSID;
788 scan->direct_scan[p].len =
789 priv->scan_request->ssids[i].ssid_len;
790 memcpy(scan->direct_scan[p].ssid,
791 priv->scan_request->ssids[i].ssid,
792 priv->scan_request->ssids[i].ssid_len);
793 n_probes++;
794 p++;
1ecf9fc1
JB		 795 }
796 is_active = true;
797 } else
798 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
2a421b91
TW		 799
800 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
801 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
802 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
803
804
1b63ba8a 805 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
f53696de 806 band = IEEE80211_BAND_2GHZ;
2a421b91 807 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
a2b0f02e
WYG		 808 chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK)
809 >> RXON_FLG_CHANNEL_MODE_POS;
810 if (chan_mod == CHANNEL_MODE_PURE_40) {
76eff18b
TW		 811 rate = IWL_RATE_6M_PLCP;
812 } else {
813 rate = IWL_RATE_1M_PLCP;
814 rate_flags = RATE_MCS_CCK_MSK;
815 }
96ff5641 816 scan->good_CRC_th = IWL_GOOD_CRC_TH_DISABLED;
1b63ba8a 817 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
f53696de 818 band = IEEE80211_BAND_5GHZ;
76eff18b 819 rate = IWL_RATE_6M_PLCP;
b097ad29 820 /*
96ff5641
JB		 821 * If active scanning is requested but a certain channel is
822 * marked passive, we can do active scanning if we detect
823 * transmissions.
824 *
825 * There is an issue with some firmware versions that triggers
826 * a sysassert on a "good CRC threshold" of zero (== disabled),
827 * on a radar channel even though this means that we should NOT
828 * send probes.
829 *
830 * The "good CRC threshold" is the number of frames that we
831 * need to receive during our dwell time on a channel before
832 * sending out probes -- setting this to a huge value will
833 * mean we never reach it, but at the same time work around
834 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
835 * here instead of IWL_GOOD_CRC_TH_DISABLED.
b097ad29 836 */
96ff5641
JB		 837 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
838 IWL_GOOD_CRC_TH_NEVER;
2a421b91 839
f53696de
TW		 840 /* Force use of chains B and C (0x6) for scan Rx for 4965
841 * Avoid A (0x1) because of its off-channel reception on A-band.
5118303f 842 */
f53696de 843 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
fff7a434 844 rx_ant = ANT_BC;
1b63ba8a 845 } else {
39aadf8c 846 IWL_WARN(priv, "Invalid scan band count\n");
2a421b91
TW		 847 goto done;
848 }
849
76eff18b
TW		 850 priv->scan_tx_ant[band] =
851 iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]);
852 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
853 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
854
f1e3d7d4
SZ		 855 /* In power save mode use one chain, otherwise use all chains */
856 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
857 /* rx_ant has been set to all valid chains previously */
858 active_chains = rx_ant &
859 ((u8)(priv->chain_noise_data.active_chains));
860 if (!active_chains)
861 active_chains = rx_ant;
862
863 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
864 priv->chain_noise_data.active_chains);
865
866 rx_ant = first_antenna(active_chains);
867 }
5118303f 868 /* MIMO is not used here, but value is required */
b23aa883 869 rx_chain |= priv->hw_params.valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
f1e3d7d4 870 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
fff7a434
WYG		 871 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
872 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
873 scan->rx_chain = cpu_to_le16(rx_chain);
afbdd69a
WYG		 874 if (!priv->is_internal_short_scan) {
875 cmd_len = iwl_fill_probe_req(priv,
876 (struct ieee80211_mgmt *)scan->data,
877 priv->scan_request->ie,
878 priv->scan_request->ie_len,
879 IWL_MAX_SCAN_SIZE - sizeof(*scan));
880 } else {
881 cmd_len = iwl_fill_probe_req(priv,
882 (struct ieee80211_mgmt *)scan->data,
883 NULL, 0,
884 IWL_MAX_SCAN_SIZE - sizeof(*scan));
2a421b91 885
afbdd69a 886 }
2a421b91 887 scan->tx_cmd.len = cpu_to_le16(cmd_len);
279b05d4 888 if (iwl_is_monitor_mode(priv))
2a421b91
TW		 889 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
890
f53696de
TW		 891 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
892 RXON_FILTER_BCON_AWARE_MSK);
893
afbdd69a
WYG		 894 if (priv->is_internal_short_scan) {
895 scan->channel_count =
896 iwl_get_single_channel_for_scan(priv, band,
897 (void *)&scan->data[le16_to_cpu(
898 scan->tx_cmd.len)]);
899 } else {
900 scan->channel_count =
901 iwl_get_channels_for_scan(priv, band,
902 is_active, n_probes,
903 (void *)&scan->data[le16_to_cpu(
904 scan->tx_cmd.len)]);
905 }
f53696de 906 if (scan->channel_count == 0) {
e1623446 907 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
f53696de
TW		 908 goto done;
909 }
2a421b91 910
2a421b91
TW		 911 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
912 scan->channel_count * sizeof(struct iwl_scan_channel);
913 cmd.data = scan;
914 scan->len = cpu_to_le16(cmd.len);
915
916 set_bit(STATUS_SCAN_HW, &priv->status);
917 ret = iwl_send_cmd_sync(priv, &cmd);
918 if (ret)
919 goto done;
920
921 queue_delayed_work(priv->workqueue, &priv->scan_check,
922 IWL_SCAN_CHECK_WATCHDOG);
923
924 mutex_unlock(&priv->mutex);
925 return;
926
927 done:
951891c7
MA		 928 /* Cannot perform scan. Make sure we clear scanning
929 * bits from status so next scan request can be performed.
930 * If we don't clear scanning status bit here all next scan
931 * will fail
932 */
933 clear_bit(STATUS_SCAN_HW, &priv->status);
934 clear_bit(STATUS_SCANNING, &priv->status);
2a421b91
TW		 935 /* inform mac80211 scan aborted */
936 queue_work(priv->workqueue, &priv->scan_completed);
937 mutex_unlock(&priv->mutex);
938}
939
77fecfb8 940void iwl_bg_abort_scan(struct work_struct *work)
2a421b91
TW		 941{
942 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
943
5bddf549
WYG		 944 if (!test_bit(STATUS_READY, &priv->status) ||
945 !test_bit(STATUS_GEO_CONFIGURED, &priv->status))
2a421b91
TW		 946 return;
947
948 mutex_lock(&priv->mutex);
949
950 set_bit(STATUS_SCAN_ABORTING, &priv->status);
951 iwl_send_scan_abort(priv);
952
953 mutex_unlock(&priv->mutex);
954}
77fecfb8 955EXPORT_SYMBOL(iwl_bg_abort_scan);
2a421b91 956
77fecfb8 957void iwl_bg_scan_completed(struct work_struct *work)
eedda367
TW		 958{
959 struct iwl_priv *priv =
960 container_of(work, struct iwl_priv, scan_completed);
961
e1623446 962 IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
eedda367 963
fbc9f97b
RC		 964 cancel_delayed_work(&priv->scan_check);
965
afbdd69a
WYG		 966 if (!priv->is_internal_short_scan)
967 ieee80211_scan_completed(priv->hw, false);
968 else {
969 priv->is_internal_short_scan = false;
970 IWL_DEBUG_SCAN(priv, "internal short scan completed\n");
971 }
74aa9be0 972
eedda367
TW		 973 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
974 return;
975
eedda367
TW		 976 /* Since setting the TXPOWER may have been deferred while
977 * performing the scan, fire one off */
978 mutex_lock(&priv->mutex);
979 iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
980 mutex_unlock(&priv->mutex);
981}
77fecfb8 982EXPORT_SYMBOL(iwl_bg_scan_completed);
eedda367 983
2a421b91
TW		 984void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
985{
eedda367 986 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
2a421b91
TW		 987 INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
988 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
88be0264 989 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
2a421b91
TW		 990 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
991}
992EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
993
Linux 6.x block layer and io_uring tree(s)