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2a421b91 TW |
1 | /****************************************************************************** |
2 | * | |
3 | * GPL LICENSE SUMMARY | |
4 | * | |
901069c7 | 5 | * Copyright(c) 2008 - 2011 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" | |
e80d70e9 | 39 | #include "iwl-agn.h" |
bdfbf092 | 40 | #include "iwl-trans.h" |
2a421b91 TW |
41 | |
42 | /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after | |
43 | * sending probe req. This should be set long enough to hear probe responses | |
44 | * from more than one AP. */ | |
fe905f1d TW |
45 | #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */ |
46 | #define IWL_ACTIVE_DWELL_TIME_52 (20) | |
47 | ||
48 | #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3) | |
49 | #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2) | |
2a421b91 | 50 | |
2a421b91 TW |
51 | /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel. |
52 | * Must be set longer than active dwell time. | |
53 | * For the most reliable scan, set > AP beacon interval (typically 100msec). */ | |
54 | #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */ | |
55 | #define IWL_PASSIVE_DWELL_TIME_52 (10) | |
56 | #define IWL_PASSIVE_DWELL_BASE (100) | |
57 | #define IWL_CHANNEL_TUNE_TIME 5 | |
58 | ||
cd44600f SG |
59 | static int iwl_send_scan_abort(struct iwl_priv *priv) |
60 | { | |
61 | int ret; | |
62 | struct iwl_rx_packet *pkt; | |
63 | struct iwl_host_cmd cmd = { | |
64 | .id = REPLY_SCAN_ABORT_CMD, | |
e419d62d | 65 | .flags = CMD_SYNC | CMD_WANT_SKB, |
cd44600f | 66 | }; |
fe905f1d | 67 | |
cd44600f SG |
68 | /* Exit instantly with error when device is not ready |
69 | * to receive scan abort command or it does not perform | |
70 | * hardware scan currently */ | |
63013ae3 EG |
71 | if (!test_bit(STATUS_READY, &priv->shrd->status) || |
72 | !test_bit(STATUS_GEO_CONFIGURED, &priv->shrd->status) || | |
73 | !test_bit(STATUS_SCAN_HW, &priv->shrd->status) || | |
74 | test_bit(STATUS_FW_ERROR, &priv->shrd->status) || | |
75 | test_bit(STATUS_EXIT_PENDING, &priv->shrd->status)) | |
cd44600f | 76 | return -EIO; |
fe905f1d | 77 | |
e6bb4c9c | 78 | ret = iwl_trans_send_cmd(trans(priv), &cmd); |
cd44600f SG |
79 | if (ret) |
80 | return ret; | |
81 | ||
82 | pkt = (struct iwl_rx_packet *)cmd.reply_page; | |
83 | if (pkt->u.status != CAN_ABORT_STATUS) { | |
84 | /* The scan abort will return 1 for success or | |
85 | * 2 for "failure". A failure condition can be | |
86 | * due to simply not being in an active scan which | |
87 | * can occur if we send the scan abort before we | |
88 | * the microcode has notified us that a scan is | |
89 | * completed. */ | |
7cf24421 | 90 | IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", pkt->u.status); |
cd44600f | 91 | ret = -EIO; |
2a421b91 TW |
92 | } |
93 | ||
790428b6 | 94 | iwl_free_pages(priv->shrd, cmd.reply_page); |
cd44600f SG |
95 | return ret; |
96 | } | |
2a421b91 | 97 | |
02d8c14b SG |
98 | static void iwl_complete_scan(struct iwl_priv *priv, bool aborted) |
99 | { | |
100 | /* check if scan was requested from mac80211 */ | |
101 | if (priv->scan_request) { | |
102 | IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n"); | |
103 | ieee80211_scan_completed(priv->hw, aborted); | |
104 | } | |
105 | ||
c6baf7fb JB |
106 | if (priv->scan_type == IWL_SCAN_ROC) { |
107 | ieee80211_remain_on_channel_expired(priv->hw); | |
108 | priv->hw_roc_channel = NULL; | |
109 | schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ); | |
110 | } | |
111 | ||
266af4c7 | 112 | priv->scan_type = IWL_SCAN_NORMAL; |
02d8c14b SG |
113 | priv->scan_vif = NULL; |
114 | priv->scan_request = NULL; | |
115 | } | |
116 | ||
a2fa2462 JB |
117 | static void iwl_process_scan_complete(struct iwl_priv *priv) |
118 | { | |
119 | bool aborted; | |
120 | ||
84b1bec6 JB |
121 | lockdep_assert_held(&priv->shrd->mutex); |
122 | ||
123 | if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status)) | |
124 | return; | |
125 | ||
a2fa2462 JB |
126 | IWL_DEBUG_SCAN(priv, "Completed scan.\n"); |
127 | ||
128 | cancel_delayed_work(&priv->scan_check); | |
129 | ||
130 | aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status); | |
131 | if (aborted) | |
132 | IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n"); | |
133 | ||
134 | if (!test_and_clear_bit(STATUS_SCANNING, &priv->shrd->status)) { | |
135 | IWL_DEBUG_SCAN(priv, "Scan already completed.\n"); | |
136 | goto out_settings; | |
137 | } | |
138 | ||
139 | if (priv->scan_type == IWL_SCAN_ROC) { | |
140 | ieee80211_remain_on_channel_expired(priv->hw); | |
141 | priv->hw_roc_channel = NULL; | |
142 | schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ); | |
143 | } | |
144 | ||
145 | if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) { | |
146 | int err; | |
147 | ||
148 | /* Check if mac80211 requested scan during our internal scan */ | |
149 | if (priv->scan_request == NULL) | |
150 | goto out_complete; | |
151 | ||
152 | /* If so request a new scan */ | |
153 | err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL, | |
154 | priv->scan_request->channels[0]->band); | |
155 | if (err) { | |
156 | IWL_DEBUG_SCAN(priv, | |
157 | "failed to initiate pending scan: %d\n", err); | |
158 | aborted = true; | |
159 | goto out_complete; | |
160 | } | |
161 | ||
162 | return; | |
163 | } | |
164 | ||
165 | out_complete: | |
166 | iwl_complete_scan(priv, aborted); | |
167 | ||
168 | out_settings: | |
169 | /* Can we still talk to firmware ? */ | |
170 | if (!iwl_is_ready_rf(priv->shrd)) | |
171 | return; | |
172 | ||
173 | iwlagn_post_scan(priv); | |
174 | } | |
175 | ||
e7e16b90 | 176 | void iwl_force_scan_end(struct iwl_priv *priv) |
f5354c17 | 177 | { |
6ac2f839 | 178 | lockdep_assert_held(&priv->shrd->mutex); |
e7e16b90 | 179 | |
63013ae3 | 180 | if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) { |
e7e16b90 SG |
181 | IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n"); |
182 | return; | |
183 | } | |
184 | ||
f5354c17 | 185 | IWL_DEBUG_SCAN(priv, "Forcing scan end\n"); |
63013ae3 EG |
186 | clear_bit(STATUS_SCANNING, &priv->shrd->status); |
187 | clear_bit(STATUS_SCAN_HW, &priv->shrd->status); | |
188 | clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status); | |
84b1bec6 | 189 | clear_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status); |
f5354c17 SG |
190 | iwl_complete_scan(priv, true); |
191 | } | |
192 | ||
cd44600f SG |
193 | static void iwl_do_scan_abort(struct iwl_priv *priv) |
194 | { | |
195 | int ret; | |
2a421b91 | 196 | |
6ac2f839 | 197 | lockdep_assert_held(&priv->shrd->mutex); |
cd44600f | 198 | |
63013ae3 | 199 | if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) { |
cd44600f SG |
200 | IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n"); |
201 | return; | |
2a421b91 TW |
202 | } |
203 | ||
63013ae3 | 204 | if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) { |
cd44600f SG |
205 | IWL_DEBUG_SCAN(priv, "Scan abort in progress\n"); |
206 | return; | |
207 | } | |
208 | ||
209 | ret = iwl_send_scan_abort(priv); | |
210 | if (ret) { | |
211 | IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret); | |
f5354c17 | 212 | iwl_force_scan_end(priv); |
cd44600f | 213 | } else |
25985edc | 214 | IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n"); |
cd44600f SG |
215 | } |
216 | ||
217 | /** | |
218 | * iwl_scan_cancel - Cancel any currently executing HW scan | |
219 | */ | |
220 | int iwl_scan_cancel(struct iwl_priv *priv) | |
221 | { | |
222 | IWL_DEBUG_SCAN(priv, "Queuing abort scan\n"); | |
74e28e44 | 223 | queue_work(priv->shrd->workqueue, &priv->abort_scan); |
2a421b91 TW |
224 | return 0; |
225 | } | |
cd44600f | 226 | |
2a421b91 TW |
227 | /** |
228 | * iwl_scan_cancel_timeout - Cancel any currently executing HW scan | |
229 | * @ms: amount of time to wait (in milliseconds) for scan to abort | |
230 | * | |
2a421b91 | 231 | */ |
98efb4a5 | 232 | void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms) |
2a421b91 | 233 | { |
e693a802 SG |
234 | unsigned long timeout = jiffies + msecs_to_jiffies(ms); |
235 | ||
6ac2f839 | 236 | lockdep_assert_held(&priv->shrd->mutex); |
2a421b91 | 237 | |
e693a802 | 238 | IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n"); |
2a421b91 | 239 | |
e693a802 SG |
240 | iwl_do_scan_abort(priv); |
241 | ||
242 | while (time_before_eq(jiffies, timeout)) { | |
63013ae3 | 243 | if (!test_bit(STATUS_SCAN_HW, &priv->shrd->status)) |
84b1bec6 | 244 | goto finished; |
e693a802 | 245 | msleep(20); |
2a421b91 | 246 | } |
84b1bec6 JB |
247 | |
248 | return; | |
249 | ||
250 | finished: | |
251 | /* | |
252 | * Now STATUS_SCAN_HW is clear. This means that the | |
253 | * device finished, but the background work is going | |
254 | * to execute at best as soon as we release the mutex. | |
255 | * Since we need to be able to issue a new scan right | |
256 | * after this function returns, run the complete here. | |
257 | * The STATUS_SCAN_COMPLETE bit will then be cleared | |
258 | * and prevent the background work from "completing" | |
259 | * a possible new scan. | |
260 | */ | |
261 | iwl_process_scan_complete(priv); | |
2a421b91 | 262 | } |
2a421b91 | 263 | |
2a421b91 | 264 | /* Service response to REPLY_SCAN_CMD (0x80) */ |
247c61d6 EG |
265 | static int iwl_rx_reply_scan(struct iwl_priv *priv, |
266 | struct iwl_rx_mem_buffer *rxb, | |
267 | struct iwl_device_cmd *cmd) | |
2a421b91 TW |
268 | { |
269 | #ifdef CONFIG_IWLWIFI_DEBUG | |
2f301227 | 270 | struct iwl_rx_packet *pkt = rxb_addr(rxb); |
2a421b91 TW |
271 | struct iwl_scanreq_notification *notif = |
272 | (struct iwl_scanreq_notification *)pkt->u.raw; | |
273 | ||
7cf24421 | 274 | IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status); |
2a421b91 | 275 | #endif |
247c61d6 | 276 | return 0; |
2a421b91 TW |
277 | } |
278 | ||
279 | /* Service SCAN_START_NOTIFICATION (0x82) */ | |
247c61d6 EG |
280 | static int iwl_rx_scan_start_notif(struct iwl_priv *priv, |
281 | struct iwl_rx_mem_buffer *rxb, | |
282 | struct iwl_device_cmd *cmd) | |
2a421b91 | 283 | { |
2f301227 | 284 | struct iwl_rx_packet *pkt = rxb_addr(rxb); |
2a421b91 TW |
285 | struct iwl_scanstart_notification *notif = |
286 | (struct iwl_scanstart_notification *)pkt->u.raw; | |
287 | priv->scan_start_tsf = le32_to_cpu(notif->tsf_low); | |
e1623446 | 288 | IWL_DEBUG_SCAN(priv, "Scan start: " |
2a421b91 TW |
289 | "%d [802.11%s] " |
290 | "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", | |
291 | notif->channel, | |
292 | notif->band ? "bg" : "a", | |
fe905f1d TW |
293 | le32_to_cpu(notif->tsf_high), |
294 | le32_to_cpu(notif->tsf_low), | |
295 | notif->status, notif->beacon_timer); | |
c6baf7fb | 296 | |
390808db JB |
297 | if (priv->scan_type == IWL_SCAN_ROC && |
298 | !priv->hw_roc_start_notified) { | |
c6baf7fb | 299 | ieee80211_ready_on_channel(priv->hw); |
390808db JB |
300 | priv->hw_roc_start_notified = true; |
301 | } | |
247c61d6 EG |
302 | |
303 | return 0; | |
2a421b91 TW |
304 | } |
305 | ||
306 | /* Service SCAN_RESULTS_NOTIFICATION (0x83) */ | |
247c61d6 EG |
307 | static int iwl_rx_scan_results_notif(struct iwl_priv *priv, |
308 | struct iwl_rx_mem_buffer *rxb, | |
309 | struct iwl_device_cmd *cmd) | |
2a421b91 TW |
310 | { |
311 | #ifdef CONFIG_IWLWIFI_DEBUG | |
2f301227 | 312 | struct iwl_rx_packet *pkt = rxb_addr(rxb); |
2a421b91 TW |
313 | struct iwl_scanresults_notification *notif = |
314 | (struct iwl_scanresults_notification *)pkt->u.raw; | |
315 | ||
e1623446 | 316 | IWL_DEBUG_SCAN(priv, "Scan ch.res: " |
2a421b91 | 317 | "%d [802.11%s] " |
1895b36b | 318 | "probe status: %u:%u " |
2a421b91 | 319 | "(TSF: 0x%08X:%08X) - %d " |
220575f7 | 320 | "elapsed=%lu usec\n", |
2a421b91 TW |
321 | notif->channel, |
322 | notif->band ? "bg" : "a", | |
1895b36b | 323 | notif->probe_status, notif->num_probe_not_sent, |
2a421b91 TW |
324 | le32_to_cpu(notif->tsf_high), |
325 | le32_to_cpu(notif->tsf_low), | |
326 | le32_to_cpu(notif->statistics[0]), | |
220575f7 | 327 | le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf); |
2a421b91 | 328 | #endif |
247c61d6 | 329 | return 0; |
2a421b91 TW |
330 | } |
331 | ||
332 | /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ | |
247c61d6 EG |
333 | static int iwl_rx_scan_complete_notif(struct iwl_priv *priv, |
334 | struct iwl_rx_mem_buffer *rxb, | |
335 | struct iwl_device_cmd *cmd) | |
2a421b91 | 336 | { |
2f301227 | 337 | struct iwl_rx_packet *pkt = rxb_addr(rxb); |
2a421b91 TW |
338 | struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw; |
339 | ||
e1623446 | 340 | IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n", |
2a421b91 TW |
341 | scan_notif->scanned_channels, |
342 | scan_notif->tsf_low, | |
343 | scan_notif->tsf_high, scan_notif->status); | |
344 | ||
7cf24421 | 345 | IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n", |
00700ee0 | 346 | (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2", |
ef1b21f7 | 347 | jiffies_to_msecs(jiffies - priv->scan_start)); |
2a421b91 | 348 | |
84b1bec6 JB |
349 | /* |
350 | * When aborting, we run the scan completed background work inline | |
351 | * and the background work must then do nothing. The SCAN_COMPLETE | |
352 | * bit helps implement that logic and thus needs to be set before | |
353 | * queueing the work. Also, since the scan abort waits for SCAN_HW | |
354 | * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW | |
355 | * to avoid a race there. | |
356 | */ | |
357 | set_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status); | |
358 | clear_bit(STATUS_SCAN_HW, &priv->shrd->status); | |
74e28e44 | 359 | queue_work(priv->shrd->workqueue, &priv->scan_completed); |
2a421b91 | 360 | |
f78e5454 | 361 | if (priv->iw_mode != NL80211_IFTYPE_ADHOC && |
88e58fc5 | 362 | iwl_advanced_bt_coexist(priv) && |
d5926d9d | 363 | priv->bt_status != scan_notif->bt_status) { |
f78e5454 WYG |
364 | if (scan_notif->bt_status) { |
365 | /* BT on */ | |
366 | if (!priv->bt_ch_announce) | |
367 | priv->bt_traffic_load = | |
368 | IWL_BT_COEX_TRAFFIC_LOAD_HIGH; | |
369 | /* | |
370 | * otherwise, no traffic load information provided | |
371 | * no changes made | |
372 | */ | |
373 | } else { | |
374 | /* BT off */ | |
375 | priv->bt_traffic_load = | |
376 | IWL_BT_COEX_TRAFFIC_LOAD_NONE; | |
377 | } | |
378 | priv->bt_status = scan_notif->bt_status; | |
74e28e44 EG |
379 | queue_work(priv->shrd->workqueue, |
380 | &priv->bt_traffic_change_work); | |
f78e5454 | 381 | } |
247c61d6 | 382 | return 0; |
2a421b91 TW |
383 | } |
384 | ||
385 | void iwl_setup_rx_scan_handlers(struct iwl_priv *priv) | |
386 | { | |
387 | /* scan handlers */ | |
388 | priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan; | |
389 | priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif; | |
390 | priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] = | |
391 | iwl_rx_scan_results_notif; | |
392 | priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] = | |
393 | iwl_rx_scan_complete_notif; | |
394 | } | |
2a421b91 | 395 | |
6e809a16 JB |
396 | static u16 iwl_get_active_dwell_time(struct iwl_priv *priv, |
397 | enum ieee80211_band band, u8 n_probes) | |
2a421b91 TW |
398 | { |
399 | if (band == IEEE80211_BAND_5GHZ) | |
fe905f1d TW |
400 | return IWL_ACTIVE_DWELL_TIME_52 + |
401 | IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1); | |
2a421b91 | 402 | else |
fe905f1d TW |
403 | return IWL_ACTIVE_DWELL_TIME_24 + |
404 | IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1); | |
2a421b91 TW |
405 | } |
406 | ||
390808db JB |
407 | static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time) |
408 | { | |
409 | struct iwl_rxon_context *ctx; | |
410 | ||
411 | /* | |
412 | * If we're associated, we clamp the dwell time 98% | |
413 | * of the smallest beacon interval (minus 2 * channel | |
414 | * tune time) | |
415 | */ | |
416 | for_each_context(priv, ctx) { | |
417 | u16 value; | |
418 | ||
419 | if (!iwl_is_associated_ctx(ctx)) | |
420 | continue; | |
421 | value = ctx->beacon_int; | |
422 | if (!value) | |
423 | value = IWL_PASSIVE_DWELL_BASE; | |
424 | value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; | |
425 | dwell_time = min(value, dwell_time); | |
426 | } | |
427 | ||
428 | return dwell_time; | |
429 | } | |
430 | ||
6e809a16 JB |
431 | static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv, |
432 | enum ieee80211_band band) | |
2a421b91 | 433 | { |
fe905f1d | 434 | u16 passive = (band == IEEE80211_BAND_2GHZ) ? |
2a421b91 TW |
435 | IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 : |
436 | IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52; | |
437 | ||
390808db | 438 | return iwl_limit_dwell(priv, passive); |
2a421b91 TW |
439 | } |
440 | ||
6e809a16 JB |
441 | static int iwl_get_single_channel_for_scan(struct iwl_priv *priv, |
442 | struct ieee80211_vif *vif, | |
443 | enum ieee80211_band band, | |
444 | struct iwl_scan_channel *scan_ch) | |
445 | { | |
446 | const struct ieee80211_supported_band *sband; | |
447 | u16 passive_dwell = 0; | |
448 | u16 active_dwell = 0; | |
449 | int added = 0; | |
450 | u16 channel = 0; | |
451 | ||
452 | sband = iwl_get_hw_mode(priv, band); | |
453 | if (!sband) { | |
454 | IWL_ERR(priv, "invalid band\n"); | |
455 | return added; | |
456 | } | |
457 | ||
458 | active_dwell = iwl_get_active_dwell_time(priv, band, 0); | |
459 | passive_dwell = iwl_get_passive_dwell_time(priv, band); | |
460 | ||
461 | if (passive_dwell <= active_dwell) | |
462 | passive_dwell = active_dwell + 1; | |
463 | ||
464 | channel = iwl_get_single_channel_number(priv, band); | |
465 | if (channel) { | |
466 | scan_ch->channel = cpu_to_le16(channel); | |
467 | scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; | |
468 | scan_ch->active_dwell = cpu_to_le16(active_dwell); | |
469 | scan_ch->passive_dwell = cpu_to_le16(passive_dwell); | |
470 | /* Set txpower levels to defaults */ | |
471 | scan_ch->dsp_atten = 110; | |
472 | if (band == IEEE80211_BAND_5GHZ) | |
473 | scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; | |
474 | else | |
475 | scan_ch->tx_gain = ((1 << 5) | (5 << 3)); | |
476 | added++; | |
477 | } else | |
478 | IWL_ERR(priv, "no valid channel found\n"); | |
479 | return added; | |
480 | } | |
481 | ||
482 | static int iwl_get_channels_for_scan(struct iwl_priv *priv, | |
483 | struct ieee80211_vif *vif, | |
484 | enum ieee80211_band band, | |
485 | u8 is_active, u8 n_probes, | |
486 | struct iwl_scan_channel *scan_ch) | |
487 | { | |
488 | struct ieee80211_channel *chan; | |
489 | const struct ieee80211_supported_band *sband; | |
490 | const struct iwl_channel_info *ch_info; | |
491 | u16 passive_dwell = 0; | |
492 | u16 active_dwell = 0; | |
493 | int added, i; | |
494 | u16 channel; | |
495 | ||
496 | sband = iwl_get_hw_mode(priv, band); | |
497 | if (!sband) | |
498 | return 0; | |
499 | ||
500 | active_dwell = iwl_get_active_dwell_time(priv, band, n_probes); | |
501 | passive_dwell = iwl_get_passive_dwell_time(priv, band); | |
502 | ||
503 | if (passive_dwell <= active_dwell) | |
504 | passive_dwell = active_dwell + 1; | |
505 | ||
506 | for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) { | |
507 | chan = priv->scan_request->channels[i]; | |
508 | ||
509 | if (chan->band != band) | |
510 | continue; | |
511 | ||
512 | channel = chan->hw_value; | |
513 | scan_ch->channel = cpu_to_le16(channel); | |
514 | ||
515 | ch_info = iwl_get_channel_info(priv, band, channel); | |
516 | if (!is_channel_valid(ch_info)) { | |
517 | IWL_DEBUG_SCAN(priv, | |
518 | "Channel %d is INVALID for this band.\n", | |
519 | channel); | |
520 | continue; | |
521 | } | |
522 | ||
523 | if (!is_active || is_channel_passive(ch_info) || | |
524 | (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)) | |
525 | scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; | |
526 | else | |
527 | scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE; | |
528 | ||
529 | if (n_probes) | |
530 | scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes); | |
531 | ||
532 | scan_ch->active_dwell = cpu_to_le16(active_dwell); | |
533 | scan_ch->passive_dwell = cpu_to_le16(passive_dwell); | |
534 | ||
535 | /* Set txpower levels to defaults */ | |
536 | scan_ch->dsp_atten = 110; | |
537 | ||
538 | /* NOTE: if we were doing 6Mb OFDM for scans we'd use | |
539 | * power level: | |
540 | * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; | |
541 | */ | |
542 | if (band == IEEE80211_BAND_5GHZ) | |
543 | scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; | |
544 | else | |
545 | scan_ch->tx_gain = ((1 << 5) | (5 << 3)); | |
546 | ||
547 | IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n", | |
548 | channel, le32_to_cpu(scan_ch->type), | |
549 | (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? | |
550 | "ACTIVE" : "PASSIVE", | |
551 | (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? | |
552 | active_dwell : passive_dwell); | |
553 | ||
554 | scan_ch++; | |
555 | added++; | |
556 | } | |
557 | ||
558 | IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added); | |
559 | return added; | |
560 | } | |
561 | ||
562 | static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif) | |
563 | { | |
564 | struct iwl_host_cmd cmd = { | |
565 | .id = REPLY_SCAN_CMD, | |
566 | .len = { sizeof(struct iwl_scan_cmd), }, | |
567 | .flags = CMD_SYNC, | |
568 | }; | |
569 | struct iwl_scan_cmd *scan; | |
570 | struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS]; | |
571 | u32 rate_flags = 0; | |
572 | u16 cmd_len; | |
573 | u16 rx_chain = 0; | |
574 | enum ieee80211_band band; | |
575 | u8 n_probes = 0; | |
576 | u8 rx_ant = hw_params(priv).valid_rx_ant; | |
577 | u8 rate; | |
578 | bool is_active = false; | |
579 | int chan_mod; | |
580 | u8 active_chains; | |
581 | u8 scan_tx_antennas = hw_params(priv).valid_tx_ant; | |
582 | int ret; | |
583 | ||
584 | lockdep_assert_held(&priv->shrd->mutex); | |
585 | ||
586 | if (vif) | |
587 | ctx = iwl_rxon_ctx_from_vif(vif); | |
588 | ||
589 | if (!priv->scan_cmd) { | |
590 | priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) + | |
591 | IWL_MAX_SCAN_SIZE, GFP_KERNEL); | |
592 | if (!priv->scan_cmd) { | |
593 | IWL_DEBUG_SCAN(priv, | |
594 | "fail to allocate memory for scan\n"); | |
595 | return -ENOMEM; | |
596 | } | |
597 | } | |
598 | scan = priv->scan_cmd; | |
599 | memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE); | |
600 | ||
601 | scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; | |
602 | scan->quiet_time = IWL_ACTIVE_QUIET_TIME; | |
603 | ||
604 | if (priv->scan_type != IWL_SCAN_ROC && | |
605 | iwl_is_any_associated(priv)) { | |
606 | u16 interval = 0; | |
607 | u32 extra; | |
608 | u32 suspend_time = 100; | |
609 | u32 scan_suspend_time = 100; | |
610 | ||
611 | IWL_DEBUG_INFO(priv, "Scanning while associated...\n"); | |
612 | switch (priv->scan_type) { | |
613 | case IWL_SCAN_ROC: | |
614 | WARN_ON(1); | |
615 | break; | |
616 | case IWL_SCAN_RADIO_RESET: | |
617 | interval = 0; | |
618 | break; | |
619 | case IWL_SCAN_NORMAL: | |
620 | interval = vif->bss_conf.beacon_int; | |
621 | break; | |
622 | } | |
623 | ||
624 | scan->suspend_time = 0; | |
625 | scan->max_out_time = cpu_to_le32(200 * 1024); | |
626 | if (!interval) | |
627 | interval = suspend_time; | |
628 | ||
629 | extra = (suspend_time / interval) << 22; | |
630 | scan_suspend_time = (extra | | |
631 | ((suspend_time % interval) * 1024)); | |
632 | scan->suspend_time = cpu_to_le32(scan_suspend_time); | |
633 | IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n", | |
634 | scan_suspend_time, interval); | |
635 | } else if (priv->scan_type == IWL_SCAN_ROC) { | |
636 | scan->suspend_time = 0; | |
637 | scan->max_out_time = 0; | |
638 | scan->quiet_time = 0; | |
639 | scan->quiet_plcp_th = 0; | |
640 | } | |
641 | ||
642 | switch (priv->scan_type) { | |
643 | case IWL_SCAN_RADIO_RESET: | |
644 | IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n"); | |
645 | break; | |
646 | case IWL_SCAN_NORMAL: | |
647 | if (priv->scan_request->n_ssids) { | |
648 | int i, p = 0; | |
649 | IWL_DEBUG_SCAN(priv, "Kicking off active scan\n"); | |
650 | for (i = 0; i < priv->scan_request->n_ssids; i++) { | |
651 | /* always does wildcard anyway */ | |
652 | if (!priv->scan_request->ssids[i].ssid_len) | |
653 | continue; | |
654 | scan->direct_scan[p].id = WLAN_EID_SSID; | |
655 | scan->direct_scan[p].len = | |
656 | priv->scan_request->ssids[i].ssid_len; | |
657 | memcpy(scan->direct_scan[p].ssid, | |
658 | priv->scan_request->ssids[i].ssid, | |
659 | priv->scan_request->ssids[i].ssid_len); | |
660 | n_probes++; | |
661 | p++; | |
662 | } | |
663 | is_active = true; | |
664 | } else | |
665 | IWL_DEBUG_SCAN(priv, "Start passive scan.\n"); | |
666 | break; | |
667 | case IWL_SCAN_ROC: | |
668 | IWL_DEBUG_SCAN(priv, "Start ROC scan.\n"); | |
669 | break; | |
670 | } | |
671 | ||
672 | scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK; | |
673 | scan->tx_cmd.sta_id = ctx->bcast_sta_id; | |
674 | scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; | |
675 | ||
676 | switch (priv->scan_band) { | |
677 | case IEEE80211_BAND_2GHZ: | |
678 | scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; | |
679 | chan_mod = le32_to_cpu( | |
680 | priv->contexts[IWL_RXON_CTX_BSS].active.flags & | |
681 | RXON_FLG_CHANNEL_MODE_MSK) | |
682 | >> RXON_FLG_CHANNEL_MODE_POS; | |
683 | if (chan_mod == CHANNEL_MODE_PURE_40) { | |
684 | rate = IWL_RATE_6M_PLCP; | |
685 | } else { | |
686 | rate = IWL_RATE_1M_PLCP; | |
687 | rate_flags = RATE_MCS_CCK_MSK; | |
688 | } | |
689 | /* | |
690 | * Internal scans are passive, so we can indiscriminately set | |
691 | * the BT ignore flag on 2.4 GHz since it applies to TX only. | |
692 | */ | |
693 | if (priv->cfg->bt_params && | |
694 | priv->cfg->bt_params->advanced_bt_coexist) | |
695 | scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT; | |
696 | break; | |
697 | case IEEE80211_BAND_5GHZ: | |
698 | rate = IWL_RATE_6M_PLCP; | |
699 | break; | |
700 | default: | |
701 | IWL_WARN(priv, "Invalid scan band\n"); | |
702 | return -EIO; | |
703 | } | |
704 | ||
705 | /* | |
706 | * If active scanning is requested but a certain channel is | |
707 | * marked passive, we can do active scanning if we detect | |
708 | * transmissions. | |
709 | * | |
710 | * There is an issue with some firmware versions that triggers | |
711 | * a sysassert on a "good CRC threshold" of zero (== disabled), | |
712 | * on a radar channel even though this means that we should NOT | |
713 | * send probes. | |
714 | * | |
715 | * The "good CRC threshold" is the number of frames that we | |
716 | * need to receive during our dwell time on a channel before | |
717 | * sending out probes -- setting this to a huge value will | |
718 | * mean we never reach it, but at the same time work around | |
719 | * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER | |
720 | * here instead of IWL_GOOD_CRC_TH_DISABLED. | |
721 | * | |
722 | * This was fixed in later versions along with some other | |
723 | * scan changes, and the threshold behaves as a flag in those | |
724 | * versions. | |
725 | */ | |
726 | if (priv->new_scan_threshold_behaviour) | |
727 | scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT : | |
728 | IWL_GOOD_CRC_TH_DISABLED; | |
729 | else | |
730 | scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT : | |
731 | IWL_GOOD_CRC_TH_NEVER; | |
732 | ||
733 | band = priv->scan_band; | |
734 | ||
735 | if (priv->cfg->scan_rx_antennas[band]) | |
736 | rx_ant = priv->cfg->scan_rx_antennas[band]; | |
737 | ||
738 | if (band == IEEE80211_BAND_2GHZ && | |
739 | priv->cfg->bt_params && | |
740 | priv->cfg->bt_params->advanced_bt_coexist) { | |
741 | /* transmit 2.4 GHz probes only on first antenna */ | |
742 | scan_tx_antennas = first_antenna(scan_tx_antennas); | |
743 | } | |
744 | ||
745 | priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv, | |
746 | priv->scan_tx_ant[band], | |
747 | scan_tx_antennas); | |
748 | rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]); | |
749 | scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags); | |
750 | ||
751 | /* In power save mode use one chain, otherwise use all chains */ | |
752 | if (test_bit(STATUS_POWER_PMI, &priv->shrd->status)) { | |
753 | /* rx_ant has been set to all valid chains previously */ | |
754 | active_chains = rx_ant & | |
755 | ((u8)(priv->chain_noise_data.active_chains)); | |
756 | if (!active_chains) | |
757 | active_chains = rx_ant; | |
758 | ||
759 | IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n", | |
760 | priv->chain_noise_data.active_chains); | |
761 | ||
762 | rx_ant = first_antenna(active_chains); | |
763 | } | |
764 | if (priv->cfg->bt_params && | |
765 | priv->cfg->bt_params->advanced_bt_coexist && | |
766 | priv->bt_full_concurrent) { | |
767 | /* operated as 1x1 in full concurrency mode */ | |
768 | rx_ant = first_antenna(rx_ant); | |
769 | } | |
770 | ||
771 | /* MIMO is not used here, but value is required */ | |
772 | rx_chain |= | |
773 | hw_params(priv).valid_rx_ant << RXON_RX_CHAIN_VALID_POS; | |
774 | rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS; | |
775 | rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS; | |
776 | rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS; | |
777 | scan->rx_chain = cpu_to_le16(rx_chain); | |
778 | switch (priv->scan_type) { | |
779 | case IWL_SCAN_NORMAL: | |
780 | cmd_len = iwl_fill_probe_req(priv, | |
781 | (struct ieee80211_mgmt *)scan->data, | |
782 | vif->addr, | |
783 | priv->scan_request->ie, | |
784 | priv->scan_request->ie_len, | |
785 | IWL_MAX_SCAN_SIZE - sizeof(*scan)); | |
786 | break; | |
787 | case IWL_SCAN_RADIO_RESET: | |
788 | case IWL_SCAN_ROC: | |
789 | /* use bcast addr, will not be transmitted but must be valid */ | |
790 | cmd_len = iwl_fill_probe_req(priv, | |
791 | (struct ieee80211_mgmt *)scan->data, | |
792 | iwl_bcast_addr, NULL, 0, | |
793 | IWL_MAX_SCAN_SIZE - sizeof(*scan)); | |
794 | break; | |
795 | default: | |
796 | BUG(); | |
797 | } | |
798 | scan->tx_cmd.len = cpu_to_le16(cmd_len); | |
799 | ||
800 | scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | | |
801 | RXON_FILTER_BCON_AWARE_MSK); | |
802 | ||
803 | switch (priv->scan_type) { | |
804 | case IWL_SCAN_RADIO_RESET: | |
805 | scan->channel_count = | |
806 | iwl_get_single_channel_for_scan(priv, vif, band, | |
807 | (void *)&scan->data[cmd_len]); | |
808 | break; | |
809 | case IWL_SCAN_NORMAL: | |
810 | scan->channel_count = | |
811 | iwl_get_channels_for_scan(priv, vif, band, | |
812 | is_active, n_probes, | |
813 | (void *)&scan->data[cmd_len]); | |
814 | break; | |
815 | case IWL_SCAN_ROC: { | |
816 | struct iwl_scan_channel *scan_ch; | |
390808db JB |
817 | int n_chan, i; |
818 | u16 dwell; | |
819 | ||
820 | dwell = iwl_limit_dwell(priv, priv->hw_roc_duration); | |
821 | n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell); | |
6e809a16 | 822 | |
390808db | 823 | scan->channel_count = n_chan; |
6e809a16 JB |
824 | |
825 | scan_ch = (void *)&scan->data[cmd_len]; | |
6e809a16 | 826 | |
390808db JB |
827 | for (i = 0; i < n_chan; i++) { |
828 | scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; | |
829 | scan_ch->channel = | |
830 | cpu_to_le16(priv->hw_roc_channel->hw_value); | |
6e809a16 | 831 | |
390808db JB |
832 | if (i == n_chan - 1) |
833 | dwell = priv->hw_roc_duration - i * dwell; | |
834 | ||
835 | scan_ch->active_dwell = | |
836 | scan_ch->passive_dwell = cpu_to_le16(dwell); | |
837 | ||
838 | /* Set txpower levels to defaults */ | |
839 | scan_ch->dsp_atten = 110; | |
840 | ||
841 | /* NOTE: if we were doing 6Mb OFDM for scans we'd use | |
842 | * power level: | |
843 | * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; | |
844 | */ | |
845 | if (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ) | |
846 | scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; | |
847 | else | |
848 | scan_ch->tx_gain = ((1 << 5) | (5 << 3)); | |
849 | ||
850 | scan_ch++; | |
6e809a16 | 851 | } |
390808db JB |
852 | } |
853 | ||
6e809a16 JB |
854 | break; |
855 | } | |
856 | ||
857 | if (scan->channel_count == 0) { | |
858 | IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count); | |
859 | return -EIO; | |
860 | } | |
861 | ||
862 | cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) + | |
863 | scan->channel_count * sizeof(struct iwl_scan_channel); | |
864 | cmd.data[0] = scan; | |
865 | cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY; | |
866 | scan->len = cpu_to_le16(cmd.len[0]); | |
867 | ||
868 | /* set scan bit here for PAN params */ | |
869 | set_bit(STATUS_SCAN_HW, &priv->shrd->status); | |
870 | ||
871 | ret = iwlagn_set_pan_params(priv); | |
872 | if (ret) | |
873 | return ret; | |
874 | ||
875 | ret = iwl_trans_send_cmd(trans(priv), &cmd); | |
876 | if (ret) { | |
877 | clear_bit(STATUS_SCAN_HW, &priv->shrd->status); | |
878 | iwlagn_set_pan_params(priv); | |
879 | } | |
880 | ||
881 | return ret; | |
882 | } | |
883 | ||
f53696de TW |
884 | void iwl_init_scan_params(struct iwl_priv *priv) |
885 | { | |
d6189124 | 886 | u8 ant_idx = fls(hw_params(priv).valid_tx_ant) - 1; |
f53696de | 887 | if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ]) |
76eff18b | 888 | priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx; |
f53696de | 889 | if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ]) |
76eff18b | 890 | priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx; |
f53696de TW |
891 | } |
892 | ||
266af4c7 JB |
893 | int __must_check iwl_scan_initiate(struct iwl_priv *priv, |
894 | struct ieee80211_vif *vif, | |
895 | enum iwl_scan_type scan_type, | |
896 | enum ieee80211_band band) | |
2a421b91 | 897 | { |
3eecce52 JB |
898 | int ret; |
899 | ||
6ac2f839 | 900 | lockdep_assert_held(&priv->shrd->mutex); |
88be0264 | 901 | |
3eecce52 JB |
902 | cancel_delayed_work(&priv->scan_check); |
903 | ||
845a9c0d | 904 | if (!iwl_is_ready_rf(priv->shrd)) { |
7cf24421 | 905 | IWL_WARN(priv, "Request scan called when driver not ready.\n"); |
3eecce52 JB |
906 | return -EIO; |
907 | } | |
908 | ||
63013ae3 | 909 | if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) { |
7cf24421 | 910 | IWL_DEBUG_SCAN(priv, |
3eecce52 JB |
911 | "Multiple concurrent scan requests in parallel.\n"); |
912 | return -EBUSY; | |
913 | } | |
914 | ||
63013ae3 | 915 | if (test_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) { |
7cf24421 | 916 | IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n"); |
3eecce52 JB |
917 | return -EBUSY; |
918 | } | |
919 | ||
7cf24421 | 920 | IWL_DEBUG_SCAN(priv, "Starting %sscan...\n", |
266af4c7 | 921 | scan_type == IWL_SCAN_NORMAL ? "" : |
c6baf7fb | 922 | scan_type == IWL_SCAN_ROC ? "remain-on-channel " : |
266af4c7 | 923 | "internal short "); |
3eecce52 | 924 | |
63013ae3 | 925 | set_bit(STATUS_SCANNING, &priv->shrd->status); |
266af4c7 | 926 | priv->scan_type = scan_type; |
2a421b91 | 927 | priv->scan_start = jiffies; |
3eecce52 | 928 | priv->scan_band = band; |
2a421b91 | 929 | |
5c3d29fc | 930 | ret = iwlagn_request_scan(priv, vif); |
3eecce52 | 931 | if (ret) { |
63013ae3 | 932 | clear_bit(STATUS_SCANNING, &priv->shrd->status); |
266af4c7 | 933 | priv->scan_type = IWL_SCAN_NORMAL; |
3eecce52 JB |
934 | return ret; |
935 | } | |
b6e4c55a | 936 | |
74e28e44 | 937 | queue_delayed_work(priv->shrd->workqueue, &priv->scan_check, |
3eecce52 | 938 | IWL_SCAN_CHECK_WATCHDOG); |
2a421b91 TW |
939 | |
940 | return 0; | |
941 | } | |
2a421b91 | 942 | |
e9dde6f6 | 943 | int iwl_mac_hw_scan(struct ieee80211_hw *hw, |
a060bbfe JB |
944 | struct ieee80211_vif *vif, |
945 | struct cfg80211_scan_request *req) | |
e9dde6f6 | 946 | { |
e9dde6f6 | 947 | struct iwl_priv *priv = hw->priv; |
00700ee0 | 948 | int ret; |
e9dde6f6 AK |
949 | |
950 | IWL_DEBUG_MAC80211(priv, "enter\n"); | |
951 | ||
00700ee0 JB |
952 | if (req->n_channels == 0) |
953 | return -EINVAL; | |
954 | ||
6ac2f839 | 955 | mutex_lock(&priv->shrd->mutex); |
e9dde6f6 | 956 | |
f84b29ec JB |
957 | /* |
958 | * If an internal scan is in progress, just set | |
959 | * up the scan_request as per above. | |
960 | */ | |
266af4c7 | 961 | if (priv->scan_type != IWL_SCAN_NORMAL) { |
8bd2c1ea JB |
962 | IWL_DEBUG_SCAN(priv, |
963 | "SCAN request during internal scan - defer\n"); | |
964 | priv->scan_request = req; | |
965 | priv->scan_vif = vif; | |
f84b29ec | 966 | ret = 0; |
8bd2c1ea JB |
967 | } else { |
968 | priv->scan_request = req; | |
969 | priv->scan_vif = vif; | |
970 | /* | |
971 | * mac80211 will only ask for one band at a time | |
972 | * so using channels[0] here is ok | |
973 | */ | |
266af4c7 | 974 | ret = iwl_scan_initiate(priv, vif, IWL_SCAN_NORMAL, |
3eecce52 | 975 | req->channels[0]->band); |
8bd2c1ea JB |
976 | if (ret) { |
977 | priv->scan_request = NULL; | |
978 | priv->scan_vif = NULL; | |
979 | } | |
980 | } | |
e9dde6f6 AK |
981 | |
982 | IWL_DEBUG_MAC80211(priv, "leave\n"); | |
983 | ||
6ac2f839 | 984 | mutex_unlock(&priv->shrd->mutex); |
e9dde6f6 AK |
985 | |
986 | return ret; | |
987 | } | |
e9dde6f6 | 988 | |
afbdd69a WYG |
989 | /* |
990 | * internal short scan, this function should only been called while associated. | |
991 | * It will reset and tune the radio to prevent possible RF related problem | |
992 | */ | |
88be0264 | 993 | void iwl_internal_short_hw_scan(struct iwl_priv *priv) |
afbdd69a | 994 | { |
74e28e44 | 995 | queue_work(priv->shrd->workqueue, &priv->start_internal_scan); |
88be0264 JB |
996 | } |
997 | ||
c240879f | 998 | static void iwl_bg_start_internal_scan(struct work_struct *work) |
88be0264 JB |
999 | { |
1000 | struct iwl_priv *priv = | |
1001 | container_of(work, struct iwl_priv, start_internal_scan); | |
1002 | ||
7cf24421 SG |
1003 | IWL_DEBUG_SCAN(priv, "Start internal scan\n"); |
1004 | ||
6ac2f839 | 1005 | mutex_lock(&priv->shrd->mutex); |
afbdd69a | 1006 | |
266af4c7 | 1007 | if (priv->scan_type == IWL_SCAN_RADIO_RESET) { |
073d5eab RC |
1008 | IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n"); |
1009 | goto unlock; | |
1010 | } | |
1011 | ||
63013ae3 | 1012 | if (test_bit(STATUS_SCANNING, &priv->shrd->status)) { |
afbdd69a | 1013 | IWL_DEBUG_SCAN(priv, "Scan already in progress.\n"); |
88be0264 | 1014 | goto unlock; |
afbdd69a | 1015 | } |
88be0264 | 1016 | |
266af4c7 | 1017 | if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band)) |
3eecce52 | 1018 | IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n"); |
88be0264 | 1019 | unlock: |
6ac2f839 | 1020 | mutex_unlock(&priv->shrd->mutex); |
afbdd69a | 1021 | } |
afbdd69a | 1022 | |
c240879f | 1023 | static void iwl_bg_scan_check(struct work_struct *data) |
2a421b91 TW |
1024 | { |
1025 | struct iwl_priv *priv = | |
1026 | container_of(data, struct iwl_priv, scan_check.work); | |
1027 | ||
7cf24421 SG |
1028 | IWL_DEBUG_SCAN(priv, "Scan check work\n"); |
1029 | ||
e7e16b90 SG |
1030 | /* Since we are here firmware does not finish scan and |
1031 | * most likely is in bad shape, so we don't bother to | |
1032 | * send abort command, just force scan complete to mac80211 */ | |
6ac2f839 | 1033 | mutex_lock(&priv->shrd->mutex); |
e7e16b90 | 1034 | iwl_force_scan_end(priv); |
6ac2f839 | 1035 | mutex_unlock(&priv->shrd->mutex); |
2a421b91 | 1036 | } |
77fecfb8 | 1037 | |
2a421b91 TW |
1038 | /** |
1039 | * iwl_fill_probe_req - fill in all required fields and IE for probe request | |
1040 | */ | |
f53696de | 1041 | |
1ecf9fc1 | 1042 | u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame, |
3a0b9aad | 1043 | const u8 *ta, const u8 *ies, int ie_len, int left) |
2a421b91 TW |
1044 | { |
1045 | int len = 0; | |
1046 | u8 *pos = NULL; | |
f53696de | 1047 | |
2a421b91 TW |
1048 | /* Make sure there is enough space for the probe request, |
1049 | * two mandatory IEs and the data */ | |
1050 | left -= 24; | |
1051 | if (left < 0) | |
1052 | return 0; | |
2a421b91 TW |
1053 | |
1054 | frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ); | |
1055 | memcpy(frame->da, iwl_bcast_addr, ETH_ALEN); | |
3a0b9aad | 1056 | memcpy(frame->sa, ta, ETH_ALEN); |
2a421b91 TW |
1057 | memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN); |
1058 | frame->seq_ctrl = 0; | |
1059 | ||
f53696de TW |
1060 | len += 24; |
1061 | ||
2a421b91 | 1062 | /* ...next IE... */ |
f53696de | 1063 | pos = &frame->u.probe_req.variable[0]; |
2a421b91 | 1064 | |
f53696de | 1065 | /* fill in our indirect SSID IE */ |
2a421b91 TW |
1066 | left -= 2; |
1067 | if (left < 0) | |
1068 | return 0; | |
2a421b91 | 1069 | *pos++ = WLAN_EID_SSID; |
1382c71c RC |
1070 | *pos++ = 0; |
1071 | ||
1072 | len += 2; | |
2a421b91 | 1073 | |
1ecf9fc1 JB |
1074 | if (WARN_ON(left < ie_len)) |
1075 | return len; | |
2a421b91 | 1076 | |
eb2ec0fb | 1077 | if (ies && ie_len) { |
afbdd69a | 1078 | memcpy(pos, ies, ie_len); |
eb2ec0fb SG |
1079 | len += ie_len; |
1080 | } | |
f53696de | 1081 | |
2a421b91 TW |
1082 | return (u16)len; |
1083 | } | |
1084 | ||
c240879f | 1085 | static void iwl_bg_abort_scan(struct work_struct *work) |
2a421b91 TW |
1086 | { |
1087 | struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan); | |
1088 | ||
7cf24421 SG |
1089 | IWL_DEBUG_SCAN(priv, "Abort scan work\n"); |
1090 | ||
e7e16b90 SG |
1091 | /* We keep scan_check work queued in case when firmware will not |
1092 | * report back scan completed notification */ | |
6ac2f839 | 1093 | mutex_lock(&priv->shrd->mutex); |
6bd1758d | 1094 | iwl_scan_cancel_timeout(priv, 200); |
6ac2f839 | 1095 | mutex_unlock(&priv->shrd->mutex); |
2a421b91 TW |
1096 | } |
1097 | ||
f253247a JB |
1098 | static void iwl_bg_scan_completed(struct work_struct *work) |
1099 | { | |
1100 | struct iwl_priv *priv = | |
1101 | container_of(work, struct iwl_priv, scan_completed); | |
52a02d15 | 1102 | |
f253247a JB |
1103 | mutex_lock(&priv->shrd->mutex); |
1104 | iwl_process_scan_complete(priv); | |
6ac2f839 | 1105 | mutex_unlock(&priv->shrd->mutex); |
eedda367 | 1106 | } |
eedda367 | 1107 | |
2a421b91 TW |
1108 | void iwl_setup_scan_deferred_work(struct iwl_priv *priv) |
1109 | { | |
eedda367 | 1110 | INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); |
2a421b91 | 1111 | INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan); |
88be0264 | 1112 | INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan); |
2a421b91 TW |
1113 | INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check); |
1114 | } | |
2a421b91 | 1115 | |
e7e16b90 SG |
1116 | void iwl_cancel_scan_deferred_work(struct iwl_priv *priv) |
1117 | { | |
1118 | cancel_work_sync(&priv->start_internal_scan); | |
1119 | cancel_work_sync(&priv->abort_scan); | |
1120 | cancel_work_sync(&priv->scan_completed); | |
1121 | ||
1122 | if (cancel_delayed_work_sync(&priv->scan_check)) { | |
6ac2f839 | 1123 | mutex_lock(&priv->shrd->mutex); |
e7e16b90 | 1124 | iwl_force_scan_end(priv); |
6ac2f839 | 1125 | mutex_unlock(&priv->shrd->mutex); |
e7e16b90 SG |
1126 | } |
1127 | } |