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Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-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 *****************************************************************************/
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;
253 else
254 priv->last_internal_scan_jiffies = jiffies;
255
e1623446 256 IWL_DEBUG_INFO(priv, "Setting scan to off\n");
2a421b91
TW		 257
258 clear_bit(STATUS_SCANNING, &priv->status);
259
e1623446 260 IWL_DEBUG_INFO(priv, "Scan took %dms\n",
2a421b91
TW		 261 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
262
263 queue_work(priv->workqueue, &priv->scan_completed);
264
265 return;
266
267reschedule:
268 priv->scan_pass_start = jiffies;
269 queue_work(priv->workqueue, &priv->request_scan);
270}
271
272void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
273{
274 /* scan handlers */
275 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
276 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
277 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
278 iwl_rx_scan_results_notif;
279 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
280 iwl_rx_scan_complete_notif;
281}
282EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
283
77fecfb8
SO		 284inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
285 enum ieee80211_band band,
286 u8 n_probes)
2a421b91
TW		 287{
288 if (band == IEEE80211_BAND_5GHZ)
fe905f1d
TW		 289 return IWL_ACTIVE_DWELL_TIME_52 +
290 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
2a421b91 291 else
fe905f1d
TW		 292 return IWL_ACTIVE_DWELL_TIME_24 +
293 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
2a421b91 294}
77fecfb8 295EXPORT_SYMBOL(iwl_get_active_dwell_time);
2a421b91 296
77fecfb8
SO		 297u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
298 enum ieee80211_band band)
2a421b91 299{
fe905f1d 300 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
2a421b91
TW		 301 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
302 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
303
304 if (iwl_is_associated(priv)) {
305 /* If we're associated, we clamp the maximum passive
306 * dwell time to be 98% of the beacon interval (minus
307 * 2 * channel tune time) */
308 passive = priv->beacon_int;
309 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
310 passive = IWL_PASSIVE_DWELL_BASE;
311 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
312 }
313
2a421b91
TW		 314 return passive;
315}
77fecfb8 316EXPORT_SYMBOL(iwl_get_passive_dwell_time);
2a421b91 317
afbdd69a
WYG		 318static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
319 enum ieee80211_band band,
320 struct iwl_scan_channel *scan_ch)
321{
322 const struct ieee80211_supported_band *sband;
323 const struct iwl_channel_info *ch_info;
324 u16 passive_dwell = 0;
325 u16 active_dwell = 0;
326 int i, added = 0;
327 u16 channel = 0;
328
329 sband = iwl_get_hw_mode(priv, band);
330 if (!sband) {
331 IWL_ERR(priv, "invalid band\n");
332 return added;
333 }
334
335 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
336 passive_dwell = iwl_get_passive_dwell_time(priv, band);
337
338 if (passive_dwell <= active_dwell)
339 passive_dwell = active_dwell + 1;
340
341 /* only scan single channel, good enough to reset the RF */
342 /* pick the first valid not in-use channel */
343 if (band == IEEE80211_BAND_5GHZ) {
344 for (i = 14; i < priv->channel_count; i++) {
345 if (priv->channel_info[i].channel !=
346 le16_to_cpu(priv->staging_rxon.channel)) {
347 channel = priv->channel_info[i].channel;
348 ch_info = iwl_get_channel_info(priv,
349 band, channel);
350 if (is_channel_valid(ch_info))
351 break;
352 }
353 }
354 } else {
355 for (i = 0; i < 14; i++) {
356 if (priv->channel_info[i].channel !=
357 le16_to_cpu(priv->staging_rxon.channel)) {
358 channel =
359 priv->channel_info[i].channel;
360 ch_info = iwl_get_channel_info(priv,
361 band, channel);
362 if (is_channel_valid(ch_info))
363 break;
364 }
365 }
366 }
367 if (channel) {
368 scan_ch->channel = cpu_to_le16(channel);
369 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
370 scan_ch->active_dwell = cpu_to_le16(active_dwell);
371 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
372 /* Set txpower levels to defaults */
373 scan_ch->dsp_atten = 110;
374 if (band == IEEE80211_BAND_5GHZ)
375 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
376 else
377 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
378 added++;
379 } else
380 IWL_ERR(priv, "no valid channel found\n");
381 return added;
382}
383
2a421b91
TW		 384static int iwl_get_channels_for_scan(struct iwl_priv *priv,
385 enum ieee80211_band band,
fe905f1d 386 u8 is_active, u8 n_probes,
2a421b91
TW		 387 struct iwl_scan_channel *scan_ch)
388{
4e05c234 389 struct ieee80211_channel *chan;
2a421b91
TW		 390 const struct ieee80211_supported_band *sband;
391 const struct iwl_channel_info *ch_info;
392 u16 passive_dwell = 0;
393 u16 active_dwell = 0;
394 int added, i;
d16dc48a 395 u16 channel;
2a421b91
TW		 396
397 sband = iwl_get_hw_mode(priv, band);
398 if (!sband)
399 return 0;
400
fe905f1d 401 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
2a421b91
TW		 402 passive_dwell = iwl_get_passive_dwell_time(priv, band);
403
fe905f1d
TW		 404 if (passive_dwell <= active_dwell)
405 passive_dwell = active_dwell + 1;
406
4e05c234
JB		 407 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
408 chan = priv->scan_request->channels[i];
409
410 if (chan->band != band)
2a421b91
TW		 411 continue;
412
4e05c234 413 channel = ieee80211_frequency_to_channel(chan->center_freq);
d16dc48a 414 scan_ch->channel = cpu_to_le16(channel);
2a421b91 415
d16dc48a 416 ch_info = iwl_get_channel_info(priv, band, channel);
2a421b91 417 if (!is_channel_valid(ch_info)) {
e1623446 418 IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
d16dc48a 419 channel);
2a421b91
TW		 420 continue;
421 }
422
423 if (!is_active || is_channel_passive(ch_info) ||
4e05c234 424 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
d16dc48a 425 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
2a421b91 426 else
d16dc48a 427 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
2a421b91 428
0ffe014a 429 if (n_probes)
fe905f1d 430 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
2a421b91
TW		 431
432 scan_ch->active_dwell = cpu_to_le16(active_dwell);
433 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
434
435 /* Set txpower levels to defaults */
f53696de 436 scan_ch->dsp_atten = 110;
2a421b91 437
fe905f1d
TW		 438 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
439 * power level:
440 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
441 */
2a421b91 442 if (band == IEEE80211_BAND_5GHZ)
f53696de 443 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
fe905f1d 444 else
f53696de 445 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
2a421b91 446
e1623446 447 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
fe905f1d 448 channel, le32_to_cpu(scan_ch->type),
d16dc48a
TW		 449 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
450 "ACTIVE" : "PASSIVE",
451 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
2a421b91
TW		 452 active_dwell : passive_dwell);
453
454 scan_ch++;
455 added++;
456 }
457
e1623446 458 IWL_DEBUG_SCAN(priv, "total channels to scan %d \n", added);
2a421b91
TW		 459 return added;
460}
461
f53696de
TW		 462void iwl_init_scan_params(struct iwl_priv *priv)
463{
76eff18b 464 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
f53696de 465 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
76eff18b 466 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
f53696de 467 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
76eff18b 468 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
f53696de 469}
89f186a8 470EXPORT_SYMBOL(iwl_init_scan_params);
f53696de 471
4e05c234 472static int iwl_scan_initiate(struct iwl_priv *priv)
2a421b91 473{
2a421b91 474 if (!iwl_is_ready_rf(priv)) {
e1623446 475 IWL_DEBUG_SCAN(priv, "Aborting scan due to not ready.\n");
2a421b91
TW		 476 return -EIO;
477 }
478
479 if (test_bit(STATUS_SCANNING, &priv->status)) {
e1623446 480 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
2a421b91
TW		 481 return -EAGAIN;
482 }
483
484 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
e1623446 485 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
2a421b91
TW		 486 return -EAGAIN;
487 }
488
e1623446 489 IWL_DEBUG_INFO(priv, "Starting scan...\n");
2a421b91 490 set_bit(STATUS_SCANNING, &priv->status);
afbdd69a 491 priv->is_internal_short_scan = false;
2a421b91
TW		 492 priv->scan_start = jiffies;
493 priv->scan_pass_start = priv->scan_start;
494
495 queue_work(priv->workqueue, &priv->request_scan);
496
497 return 0;
498}
2a421b91 499
e9dde6f6
AK		 500#define IWL_DELAY_NEXT_SCAN (HZ*2)
501
502int iwl_mac_hw_scan(struct ieee80211_hw *hw,
503 struct cfg80211_scan_request *req)
504{
505 unsigned long flags;
506 struct iwl_priv *priv = hw->priv;
4e05c234 507 int ret, i;
e9dde6f6
AK		 508
509 IWL_DEBUG_MAC80211(priv, "enter\n");
510
511 mutex_lock(&priv->mutex);
512 spin_lock_irqsave(&priv->lock, flags);
513
514 if (!iwl_is_ready_rf(priv)) {
515 ret = -EIO;
516 IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n");
517 goto out_unlock;
518 }
519
520 /* We don't schedule scan within next_scan_jiffies period.
521 * Avoid scanning during possible EAPOL exchange, return
522 * success immediately.
523 */
524 if (priv->next_scan_jiffies &&
525 time_after(priv->next_scan_jiffies, jiffies)) {
526 IWL_DEBUG_SCAN(priv, "scan rejected: within next scan period\n");
527 queue_work(priv->workqueue, &priv->scan_completed);
e9dde6f6
AK		 528 ret = 0;
529 goto out_unlock;
530 }
531
4e05c234
JB		 532 priv->scan_bands = 0;
533 for (i = 0; i < req->n_channels; i++)
534 priv->scan_bands |= BIT(req->channels[i]->band);
535
1ecf9fc1 536 priv->scan_request = req;
e9dde6f6
AK		 537
538 ret = iwl_scan_initiate(priv);
539
540 IWL_DEBUG_MAC80211(priv, "leave\n");
541
542out_unlock:
543 spin_unlock_irqrestore(&priv->lock, flags);
544 mutex_unlock(&priv->mutex);
545
546 return ret;
547}
548EXPORT_SYMBOL(iwl_mac_hw_scan);
549
afbdd69a
WYG		 550/*
551 * internal short scan, this function should only been called while associated.
552 * It will reset and tune the radio to prevent possible RF related problem
553 */
d4d59e88
WYG		 554#define IWL_DELAY_NEXT_INTERNAL_SCAN (HZ*1)
555
afbdd69a
WYG		 556int iwl_internal_short_hw_scan(struct iwl_priv *priv)
557{
558 int ret = 0;
559
560 if (!iwl_is_ready_rf(priv)) {
561 ret = -EIO;
562 IWL_DEBUG_SCAN(priv, "not ready or exit pending\n");
563 goto out;
564 }
565 if (test_bit(STATUS_SCANNING, &priv->status)) {
566 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
567 ret = -EAGAIN;
568 goto out;
569 }
570 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
571 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
572 ret = -EAGAIN;
573 goto out;
574 }
d4d59e88
WYG		 575 if (priv->last_internal_scan_jiffies &&
576 time_after(priv->last_internal_scan_jiffies +
577 IWL_DELAY_NEXT_INTERNAL_SCAN, jiffies)) {
578 IWL_DEBUG_SCAN(priv, "internal scan rejected\n");
579 goto out;
580 }
581
afbdd69a
WYG		 582 priv->scan_bands = 0;
583 if (priv->band == IEEE80211_BAND_5GHZ)
584 priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ);
585 else
586 priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ);
587
588 IWL_DEBUG_SCAN(priv, "Start internal short scan...\n");
589 set_bit(STATUS_SCANNING, &priv->status);
590 priv->is_internal_short_scan = true;
591 queue_work(priv->workqueue, &priv->request_scan);
592
593out:
594 return ret;
595}
596EXPORT_SYMBOL(iwl_internal_short_hw_scan);
597
2a421b91
TW		 598#define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
599
77fecfb8 600void iwl_bg_scan_check(struct work_struct *data)
2a421b91
TW		 601{
602 struct iwl_priv *priv =
603 container_of(data, struct iwl_priv, scan_check.work);
604
605 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
606 return;
607
608 mutex_lock(&priv->mutex);
609 if (test_bit(STATUS_SCANNING, &priv->status) ||
610 test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
e1623446 611 IWL_DEBUG_SCAN(priv, "Scan completion watchdog resetting "
2a421b91
TW		 612 "adapter (%dms)\n",
613 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
614
615 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
616 iwl_send_scan_abort(priv);
617 }
618 mutex_unlock(&priv->mutex);
619}
77fecfb8
SO		 620EXPORT_SYMBOL(iwl_bg_scan_check);
621
2a421b91
TW		 622/**
623 * iwl_fill_probe_req - fill in all required fields and IE for probe request
624 */
f53696de 625
1ecf9fc1
JB		 626u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
627 const u8 *ies, int ie_len, int left)
2a421b91
TW		 628{
629 int len = 0;
630 u8 *pos = NULL;
f53696de 631
2a421b91
TW		 632 /* Make sure there is enough space for the probe request,
633 * two mandatory IEs and the data */
634 left -= 24;
635 if (left < 0)
636 return 0;
2a421b91
TW		 637
638 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
639 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
640 memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
641 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
642 frame->seq_ctrl = 0;
643
f53696de
TW		 644 len += 24;
645
2a421b91 646 /* ...next IE... */
f53696de 647 pos = &frame->u.probe_req.variable[0];
2a421b91 648
f53696de 649 /* fill in our indirect SSID IE */
2a421b91
TW		 650 left -= 2;
651 if (left < 0)
652 return 0;
2a421b91 653 *pos++ = WLAN_EID_SSID;
21b2d8bd
SO		 654 if (!priv->is_internal_short_scan &&
655 priv->scan_request->n_ssids) {
656 struct cfg80211_ssid *ssid =
657 priv->scan_request->ssids;
658
659 /* Broadcast if ssid_len is 0 */
660 *pos++ = ssid->ssid_len;
661 memcpy(pos, ssid->ssid, ssid->ssid_len);
662 pos += ssid->ssid_len;
663 len += 2 + ssid->ssid_len;
664 } else {
665 *pos++ = 0;
666 len += 2;
667 }
2a421b91 668
1ecf9fc1
JB		 669 if (WARN_ON(left < ie_len))
670 return len;
2a421b91 671
afbdd69a
WYG		 672 if (ies)
673 memcpy(pos, ies, ie_len);
1ecf9fc1
JB		 674 len += ie_len;
675 left -= ie_len;
f53696de 676
2a421b91
TW		 677 return (u16)len;
678}
77fecfb8 679EXPORT_SYMBOL(iwl_fill_probe_req);
2a421b91
TW		 680
681static void iwl_bg_request_scan(struct work_struct *data)
682{
683 struct iwl_priv *priv =
684 container_of(data, struct iwl_priv, request_scan);
685 struct iwl_host_cmd cmd = {
686 .id = REPLY_SCAN_CMD,
687 .len = sizeof(struct iwl_scan_cmd),
c2acea8e 688 .flags = CMD_SIZE_HUGE,
2a421b91
TW		 689 };
690 struct iwl_scan_cmd *scan;
691 struct ieee80211_conf *conf = NULL;
f53696de 692 int ret = 0;
76eff18b 693 u32 rate_flags = 0;
2a421b91 694 u16 cmd_len;
fff7a434 695 u16 rx_chain = 0;
2a421b91 696 enum ieee80211_band band;
1ecf9fc1 697 u8 n_probes = 0;
fff7a434 698 u8 rx_ant = priv->hw_params.valid_rx_ant;
76eff18b 699 u8 rate;
1ecf9fc1 700 bool is_active = false;
a2b0f02e 701 int chan_mod;
f1e3d7d4 702 u8 active_chains;
2a421b91
TW		 703
704 conf = ieee80211_get_hw_conf(priv->hw);
705
706 mutex_lock(&priv->mutex);
707
fbc9f97b
RC		 708 cancel_delayed_work(&priv->scan_check);
709
2a421b91 710 if (!iwl_is_ready(priv)) {
39aadf8c 711 IWL_WARN(priv, "request scan called when driver not ready.\n");
2a421b91
TW		 712 goto done;
713 }
714
a96a27f9 715 /* Make sure the scan wasn't canceled before this queued work
2a421b91
TW		 716 * was given the chance to run... */
717 if (!test_bit(STATUS_SCANNING, &priv->status))
718 goto done;
719
720 /* This should never be called or scheduled if there is currently
721 * a scan active in the hardware. */
722 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
e1623446 723 IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. "
2a421b91
TW		 724 "Ignoring second request.\n");
725 ret = -EIO;
726 goto done;
727 }
728
729 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
e1623446 730 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
2a421b91
TW		 731 goto done;
732 }
733
734 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
e1623446 735 IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n");
2a421b91
TW		 736 goto done;
737 }
738
739 if (iwl_is_rfkill(priv)) {
e1623446 740 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
2a421b91
TW		 741 goto done;
742 }
743
744 if (!test_bit(STATUS_READY, &priv->status)) {
e1623446 745 IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n");
2a421b91
TW		 746 goto done;
747 }
748
749 if (!priv->scan_bands) {
e1623446 750 IWL_DEBUG_HC(priv, "Aborting scan due to no requested bands\n");
2a421b91
TW		 751 goto done;
752 }
753
754 if (!priv->scan) {
755 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
756 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
757 if (!priv->scan) {
758 ret = -ENOMEM;
759 goto done;
760 }
761 }
762 scan = priv->scan;
763 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
764
765 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
766 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
767
768 if (iwl_is_associated(priv)) {
769 u16 interval = 0;
770 u32 extra;
771 u32 suspend_time = 100;
772 u32 scan_suspend_time = 100;
773 unsigned long flags;
774
e1623446 775 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
2a421b91
TW		 776 spin_lock_irqsave(&priv->lock, flags);
777 interval = priv->beacon_int;
778 spin_unlock_irqrestore(&priv->lock, flags);
779
780 scan->suspend_time = 0;
781 scan->max_out_time = cpu_to_le32(200 * 1024);
782 if (!interval)
783 interval = suspend_time;
784
785 extra = (suspend_time / interval) << 22;
786 scan_suspend_time = (extra |
787 ((suspend_time % interval) * 1024));
788 scan->suspend_time = cpu_to_le32(scan_suspend_time);
e1623446 789 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
2a421b91
TW		 790 scan_suspend_time, interval);
791 }
792
afbdd69a
WYG		 793 if (priv->is_internal_short_scan) {
794 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
795 } else if (priv->scan_request->n_ssids) {
1ecf9fc1 796 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
21b2d8bd
SO		 797 /*
798 * The first SSID to scan is stuffed into the probe request
799 * template and the remaining ones are handled through the
800 * direct_scan array.
801 */
802 if (priv->scan_request->n_ssids > 1) {
803 int i, p = 0;
804 for (i = 1; i < priv->scan_request->n_ssids; i++) {
805 if (!priv->scan_request->ssids[i].ssid_len)
806 continue;
807 scan->direct_scan[p].id = WLAN_EID_SSID;
808 scan->direct_scan[p].len =
809 priv->scan_request->ssids[i].ssid_len;
810 memcpy(scan->direct_scan[p].ssid,
811 priv->scan_request->ssids[i].ssid,
812 priv->scan_request->ssids[i].ssid_len);
813 n_probes++;
814 p++;
815 }
1ecf9fc1
JB		 816 }
817 is_active = true;
818 } else
819 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
2a421b91
TW		 820
821 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
822 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
823 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
824
825
1b63ba8a 826 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
f53696de 827 band = IEEE80211_BAND_2GHZ;
2a421b91 828 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
a2b0f02e
WYG		 829 chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK)
830 >> RXON_FLG_CHANNEL_MODE_POS;
831 if (chan_mod == CHANNEL_MODE_PURE_40) {
76eff18b
TW		 832 rate = IWL_RATE_6M_PLCP;
833 } else {
834 rate = IWL_RATE_1M_PLCP;
835 rate_flags = RATE_MCS_CCK_MSK;
836 }
2a421b91 837 scan->good_CRC_th = 0;
1b63ba8a 838 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
f53696de 839 band = IEEE80211_BAND_5GHZ;
76eff18b 840 rate = IWL_RATE_6M_PLCP;
b097ad29
JB		 841 /*
842 * If active scaning is requested but a certain channel
843 * is marked passive, we can do active scanning if we
844 * detect transmissions.
845 */
846 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH : 0;
2a421b91 847
f53696de
TW		 848 /* Force use of chains B and C (0x6) for scan Rx for 4965
849 * Avoid A (0x1) because of its off-channel reception on A-band.
5118303f 850 */
f53696de 851 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
fff7a434 852 rx_ant = ANT_BC;
1b63ba8a 853 } else {
39aadf8c 854 IWL_WARN(priv, "Invalid scan band count\n");
2a421b91
TW		 855 goto done;
856 }
857
76eff18b
TW		 858 priv->scan_tx_ant[band] =
859 iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]);
860 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
861 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
862
f1e3d7d4
SZ		 863 /* In power save mode use one chain, otherwise use all chains */
864 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
865 /* rx_ant has been set to all valid chains previously */
866 active_chains = rx_ant &
867 ((u8)(priv->chain_noise_data.active_chains));
868 if (!active_chains)
869 active_chains = rx_ant;
870
871 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
872 priv->chain_noise_data.active_chains);
873
874 rx_ant = first_antenna(active_chains);
875 }
5118303f 876 /* MIMO is not used here, but value is required */
b23aa883 877 rx_chain |= priv->hw_params.valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
f1e3d7d4 878 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
fff7a434
WYG		 879 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
880 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
881 scan->rx_chain = cpu_to_le16(rx_chain);
afbdd69a
WYG		 882 if (!priv->is_internal_short_scan) {
883 cmd_len = iwl_fill_probe_req(priv,
884 (struct ieee80211_mgmt *)scan->data,
885 priv->scan_request->ie,
886 priv->scan_request->ie_len,
887 IWL_MAX_SCAN_SIZE - sizeof(*scan));
888 } else {
889 cmd_len = iwl_fill_probe_req(priv,
890 (struct ieee80211_mgmt *)scan->data,
891 NULL, 0,
892 IWL_MAX_SCAN_SIZE - sizeof(*scan));
2a421b91 893
afbdd69a 894 }
2a421b91 895 scan->tx_cmd.len = cpu_to_le16(cmd_len);
279b05d4 896 if (iwl_is_monitor_mode(priv))
2a421b91
TW		 897 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
898
f53696de
TW		 899 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
900 RXON_FILTER_BCON_AWARE_MSK);
901
afbdd69a
WYG		 902 if (priv->is_internal_short_scan) {
903 scan->channel_count =
904 iwl_get_single_channel_for_scan(priv, band,
905 (void *)&scan->data[le16_to_cpu(
906 scan->tx_cmd.len)]);
907 } else {
908 scan->channel_count =
909 iwl_get_channels_for_scan(priv, band,
910 is_active, n_probes,
911 (void *)&scan->data[le16_to_cpu(
912 scan->tx_cmd.len)]);
913 }
f53696de 914 if (scan->channel_count == 0) {
e1623446 915 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
f53696de
TW		 916 goto done;
917 }
2a421b91 918
2a421b91
TW		 919 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
920 scan->channel_count * sizeof(struct iwl_scan_channel);
921 cmd.data = scan;
922 scan->len = cpu_to_le16(cmd.len);
923
924 set_bit(STATUS_SCAN_HW, &priv->status);
925 ret = iwl_send_cmd_sync(priv, &cmd);
926 if (ret)
927 goto done;
928
929 queue_delayed_work(priv->workqueue, &priv->scan_check,
930 IWL_SCAN_CHECK_WATCHDOG);
931
932 mutex_unlock(&priv->mutex);
933 return;
934
935 done:
951891c7
MA		 936 /* Cannot perform scan. Make sure we clear scanning
937 * bits from status so next scan request can be performed.
938 * If we don't clear scanning status bit here all next scan
939 * will fail
940 */
941 clear_bit(STATUS_SCAN_HW, &priv->status);
942 clear_bit(STATUS_SCANNING, &priv->status);
2a421b91
TW		 943 /* inform mac80211 scan aborted */
944 queue_work(priv->workqueue, &priv->scan_completed);
945 mutex_unlock(&priv->mutex);
946}
947
77fecfb8 948void iwl_bg_abort_scan(struct work_struct *work)
2a421b91
TW		 949{
950 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
951
5bddf549
WYG		 952 if (!test_bit(STATUS_READY, &priv->status) ||
953 !test_bit(STATUS_GEO_CONFIGURED, &priv->status))
2a421b91
TW		 954 return;
955
956 mutex_lock(&priv->mutex);
957
958 set_bit(STATUS_SCAN_ABORTING, &priv->status);
959 iwl_send_scan_abort(priv);
960
961 mutex_unlock(&priv->mutex);
962}
77fecfb8 963EXPORT_SYMBOL(iwl_bg_abort_scan);
2a421b91 964
77fecfb8 965void iwl_bg_scan_completed(struct work_struct *work)
eedda367
TW		 966{
967 struct iwl_priv *priv =
968 container_of(work, struct iwl_priv, scan_completed);
969
e1623446 970 IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
eedda367 971
fbc9f97b
RC		 972 cancel_delayed_work(&priv->scan_check);
973
afbdd69a
WYG		 974 if (!priv->is_internal_short_scan)
975 ieee80211_scan_completed(priv->hw, false);
976 else {
977 priv->is_internal_short_scan = false;
978 IWL_DEBUG_SCAN(priv, "internal short scan completed\n");
979 }
74aa9be0 980
eedda367
TW		 981 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
982 return;
983
eedda367
TW		 984 /* Since setting the TXPOWER may have been deferred while
985 * performing the scan, fire one off */
986 mutex_lock(&priv->mutex);
987 iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
988 mutex_unlock(&priv->mutex);
989}
77fecfb8 990EXPORT_SYMBOL(iwl_bg_scan_completed);
eedda367 991
2a421b91
TW		 992void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
993{
eedda367 994 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
2a421b91
TW		 995 INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
996 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
997 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
998}
999EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
1000
Linux 6.x block layer and io_uring tree(s)