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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 | ||
e7e16b90 | 117 | void iwl_force_scan_end(struct iwl_priv *priv) |
f5354c17 | 118 | { |
6ac2f839 | 119 | lockdep_assert_held(&priv->shrd->mutex); |
e7e16b90 | 120 | |
63013ae3 | 121 | if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) { |
e7e16b90 SG |
122 | IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n"); |
123 | return; | |
124 | } | |
125 | ||
f5354c17 | 126 | IWL_DEBUG_SCAN(priv, "Forcing scan end\n"); |
63013ae3 EG |
127 | clear_bit(STATUS_SCANNING, &priv->shrd->status); |
128 | clear_bit(STATUS_SCAN_HW, &priv->shrd->status); | |
129 | clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status); | |
f5354c17 SG |
130 | iwl_complete_scan(priv, true); |
131 | } | |
132 | ||
cd44600f SG |
133 | static void iwl_do_scan_abort(struct iwl_priv *priv) |
134 | { | |
135 | int ret; | |
2a421b91 | 136 | |
6ac2f839 | 137 | lockdep_assert_held(&priv->shrd->mutex); |
cd44600f | 138 | |
63013ae3 | 139 | if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) { |
cd44600f SG |
140 | IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n"); |
141 | return; | |
2a421b91 TW |
142 | } |
143 | ||
63013ae3 | 144 | if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) { |
cd44600f SG |
145 | IWL_DEBUG_SCAN(priv, "Scan abort in progress\n"); |
146 | return; | |
147 | } | |
148 | ||
149 | ret = iwl_send_scan_abort(priv); | |
150 | if (ret) { | |
151 | IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret); | |
f5354c17 | 152 | iwl_force_scan_end(priv); |
cd44600f | 153 | } else |
25985edc | 154 | IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n"); |
cd44600f SG |
155 | } |
156 | ||
157 | /** | |
158 | * iwl_scan_cancel - Cancel any currently executing HW scan | |
159 | */ | |
160 | int iwl_scan_cancel(struct iwl_priv *priv) | |
161 | { | |
162 | IWL_DEBUG_SCAN(priv, "Queuing abort scan\n"); | |
74e28e44 | 163 | queue_work(priv->shrd->workqueue, &priv->abort_scan); |
2a421b91 TW |
164 | return 0; |
165 | } | |
cd44600f | 166 | |
2a421b91 TW |
167 | /** |
168 | * iwl_scan_cancel_timeout - Cancel any currently executing HW scan | |
169 | * @ms: amount of time to wait (in milliseconds) for scan to abort | |
170 | * | |
2a421b91 TW |
171 | */ |
172 | int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms) | |
173 | { | |
e693a802 SG |
174 | unsigned long timeout = jiffies + msecs_to_jiffies(ms); |
175 | ||
6ac2f839 | 176 | lockdep_assert_held(&priv->shrd->mutex); |
2a421b91 | 177 | |
e693a802 | 178 | IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n"); |
2a421b91 | 179 | |
e693a802 SG |
180 | iwl_do_scan_abort(priv); |
181 | ||
182 | while (time_before_eq(jiffies, timeout)) { | |
63013ae3 | 183 | if (!test_bit(STATUS_SCAN_HW, &priv->shrd->status)) |
e693a802 SG |
184 | break; |
185 | msleep(20); | |
2a421b91 TW |
186 | } |
187 | ||
63013ae3 | 188 | return test_bit(STATUS_SCAN_HW, &priv->shrd->status); |
2a421b91 | 189 | } |
2a421b91 | 190 | |
2a421b91 | 191 | /* Service response to REPLY_SCAN_CMD (0x80) */ |
247c61d6 EG |
192 | static int iwl_rx_reply_scan(struct iwl_priv *priv, |
193 | struct iwl_rx_mem_buffer *rxb, | |
194 | struct iwl_device_cmd *cmd) | |
2a421b91 TW |
195 | { |
196 | #ifdef CONFIG_IWLWIFI_DEBUG | |
2f301227 | 197 | struct iwl_rx_packet *pkt = rxb_addr(rxb); |
2a421b91 TW |
198 | struct iwl_scanreq_notification *notif = |
199 | (struct iwl_scanreq_notification *)pkt->u.raw; | |
200 | ||
7cf24421 | 201 | IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status); |
2a421b91 | 202 | #endif |
247c61d6 | 203 | return 0; |
2a421b91 TW |
204 | } |
205 | ||
206 | /* Service SCAN_START_NOTIFICATION (0x82) */ | |
247c61d6 EG |
207 | static int iwl_rx_scan_start_notif(struct iwl_priv *priv, |
208 | struct iwl_rx_mem_buffer *rxb, | |
209 | struct iwl_device_cmd *cmd) | |
2a421b91 | 210 | { |
2f301227 | 211 | struct iwl_rx_packet *pkt = rxb_addr(rxb); |
2a421b91 TW |
212 | struct iwl_scanstart_notification *notif = |
213 | (struct iwl_scanstart_notification *)pkt->u.raw; | |
214 | priv->scan_start_tsf = le32_to_cpu(notif->tsf_low); | |
e1623446 | 215 | IWL_DEBUG_SCAN(priv, "Scan start: " |
2a421b91 TW |
216 | "%d [802.11%s] " |
217 | "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", | |
218 | notif->channel, | |
219 | notif->band ? "bg" : "a", | |
fe905f1d TW |
220 | le32_to_cpu(notif->tsf_high), |
221 | le32_to_cpu(notif->tsf_low), | |
222 | notif->status, notif->beacon_timer); | |
c6baf7fb | 223 | |
390808db JB |
224 | if (priv->scan_type == IWL_SCAN_ROC && |
225 | !priv->hw_roc_start_notified) { | |
c6baf7fb | 226 | ieee80211_ready_on_channel(priv->hw); |
390808db JB |
227 | priv->hw_roc_start_notified = true; |
228 | } | |
247c61d6 EG |
229 | |
230 | return 0; | |
2a421b91 TW |
231 | } |
232 | ||
233 | /* Service SCAN_RESULTS_NOTIFICATION (0x83) */ | |
247c61d6 EG |
234 | static int iwl_rx_scan_results_notif(struct iwl_priv *priv, |
235 | struct iwl_rx_mem_buffer *rxb, | |
236 | struct iwl_device_cmd *cmd) | |
2a421b91 TW |
237 | { |
238 | #ifdef CONFIG_IWLWIFI_DEBUG | |
2f301227 | 239 | struct iwl_rx_packet *pkt = rxb_addr(rxb); |
2a421b91 TW |
240 | struct iwl_scanresults_notification *notif = |
241 | (struct iwl_scanresults_notification *)pkt->u.raw; | |
242 | ||
e1623446 | 243 | IWL_DEBUG_SCAN(priv, "Scan ch.res: " |
2a421b91 | 244 | "%d [802.11%s] " |
1895b36b | 245 | "probe status: %u:%u " |
2a421b91 | 246 | "(TSF: 0x%08X:%08X) - %d " |
220575f7 | 247 | "elapsed=%lu usec\n", |
2a421b91 TW |
248 | notif->channel, |
249 | notif->band ? "bg" : "a", | |
1895b36b | 250 | notif->probe_status, notif->num_probe_not_sent, |
2a421b91 TW |
251 | le32_to_cpu(notif->tsf_high), |
252 | le32_to_cpu(notif->tsf_low), | |
253 | le32_to_cpu(notif->statistics[0]), | |
220575f7 | 254 | le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf); |
2a421b91 | 255 | #endif |
247c61d6 | 256 | return 0; |
2a421b91 TW |
257 | } |
258 | ||
259 | /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ | |
247c61d6 EG |
260 | static int iwl_rx_scan_complete_notif(struct iwl_priv *priv, |
261 | struct iwl_rx_mem_buffer *rxb, | |
262 | struct iwl_device_cmd *cmd) | |
2a421b91 | 263 | { |
2f301227 | 264 | struct iwl_rx_packet *pkt = rxb_addr(rxb); |
2a421b91 TW |
265 | struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw; |
266 | ||
e1623446 | 267 | IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n", |
2a421b91 TW |
268 | scan_notif->scanned_channels, |
269 | scan_notif->tsf_low, | |
270 | scan_notif->tsf_high, scan_notif->status); | |
271 | ||
272 | /* The HW is no longer scanning */ | |
63013ae3 | 273 | clear_bit(STATUS_SCAN_HW, &priv->shrd->status); |
2a421b91 | 274 | |
7cf24421 | 275 | IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n", |
00700ee0 | 276 | (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2", |
ef1b21f7 | 277 | jiffies_to_msecs(jiffies - priv->scan_start)); |
2a421b91 | 278 | |
74e28e44 | 279 | queue_work(priv->shrd->workqueue, &priv->scan_completed); |
2a421b91 | 280 | |
f78e5454 | 281 | if (priv->iw_mode != NL80211_IFTYPE_ADHOC && |
88e58fc5 | 282 | iwl_advanced_bt_coexist(priv) && |
d5926d9d | 283 | priv->bt_status != scan_notif->bt_status) { |
f78e5454 WYG |
284 | if (scan_notif->bt_status) { |
285 | /* BT on */ | |
286 | if (!priv->bt_ch_announce) | |
287 | priv->bt_traffic_load = | |
288 | IWL_BT_COEX_TRAFFIC_LOAD_HIGH; | |
289 | /* | |
290 | * otherwise, no traffic load information provided | |
291 | * no changes made | |
292 | */ | |
293 | } else { | |
294 | /* BT off */ | |
295 | priv->bt_traffic_load = | |
296 | IWL_BT_COEX_TRAFFIC_LOAD_NONE; | |
297 | } | |
298 | priv->bt_status = scan_notif->bt_status; | |
74e28e44 EG |
299 | queue_work(priv->shrd->workqueue, |
300 | &priv->bt_traffic_change_work); | |
f78e5454 | 301 | } |
247c61d6 | 302 | return 0; |
2a421b91 TW |
303 | } |
304 | ||
305 | void iwl_setup_rx_scan_handlers(struct iwl_priv *priv) | |
306 | { | |
307 | /* scan handlers */ | |
308 | priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan; | |
309 | priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif; | |
310 | priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] = | |
311 | iwl_rx_scan_results_notif; | |
312 | priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] = | |
313 | iwl_rx_scan_complete_notif; | |
314 | } | |
2a421b91 | 315 | |
6e809a16 JB |
316 | static u16 iwl_get_active_dwell_time(struct iwl_priv *priv, |
317 | enum ieee80211_band band, u8 n_probes) | |
2a421b91 TW |
318 | { |
319 | if (band == IEEE80211_BAND_5GHZ) | |
fe905f1d TW |
320 | return IWL_ACTIVE_DWELL_TIME_52 + |
321 | IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1); | |
2a421b91 | 322 | else |
fe905f1d TW |
323 | return IWL_ACTIVE_DWELL_TIME_24 + |
324 | IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1); | |
2a421b91 TW |
325 | } |
326 | ||
390808db JB |
327 | static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time) |
328 | { | |
329 | struct iwl_rxon_context *ctx; | |
330 | ||
331 | /* | |
332 | * If we're associated, we clamp the dwell time 98% | |
333 | * of the smallest beacon interval (minus 2 * channel | |
334 | * tune time) | |
335 | */ | |
336 | for_each_context(priv, ctx) { | |
337 | u16 value; | |
338 | ||
339 | if (!iwl_is_associated_ctx(ctx)) | |
340 | continue; | |
341 | value = ctx->beacon_int; | |
342 | if (!value) | |
343 | value = IWL_PASSIVE_DWELL_BASE; | |
344 | value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; | |
345 | dwell_time = min(value, dwell_time); | |
346 | } | |
347 | ||
348 | return dwell_time; | |
349 | } | |
350 | ||
6e809a16 JB |
351 | static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv, |
352 | enum ieee80211_band band) | |
2a421b91 | 353 | { |
fe905f1d | 354 | u16 passive = (band == IEEE80211_BAND_2GHZ) ? |
2a421b91 TW |
355 | IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 : |
356 | IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52; | |
357 | ||
390808db | 358 | return iwl_limit_dwell(priv, passive); |
2a421b91 TW |
359 | } |
360 | ||
6e809a16 JB |
361 | static int iwl_get_single_channel_for_scan(struct iwl_priv *priv, |
362 | struct ieee80211_vif *vif, | |
363 | enum ieee80211_band band, | |
364 | struct iwl_scan_channel *scan_ch) | |
365 | { | |
366 | const struct ieee80211_supported_band *sband; | |
367 | u16 passive_dwell = 0; | |
368 | u16 active_dwell = 0; | |
369 | int added = 0; | |
370 | u16 channel = 0; | |
371 | ||
372 | sband = iwl_get_hw_mode(priv, band); | |
373 | if (!sband) { | |
374 | IWL_ERR(priv, "invalid band\n"); | |
375 | return added; | |
376 | } | |
377 | ||
378 | active_dwell = iwl_get_active_dwell_time(priv, band, 0); | |
379 | passive_dwell = iwl_get_passive_dwell_time(priv, band); | |
380 | ||
381 | if (passive_dwell <= active_dwell) | |
382 | passive_dwell = active_dwell + 1; | |
383 | ||
384 | channel = iwl_get_single_channel_number(priv, band); | |
385 | if (channel) { | |
386 | scan_ch->channel = cpu_to_le16(channel); | |
387 | scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; | |
388 | scan_ch->active_dwell = cpu_to_le16(active_dwell); | |
389 | scan_ch->passive_dwell = cpu_to_le16(passive_dwell); | |
390 | /* Set txpower levels to defaults */ | |
391 | scan_ch->dsp_atten = 110; | |
392 | if (band == IEEE80211_BAND_5GHZ) | |
393 | scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; | |
394 | else | |
395 | scan_ch->tx_gain = ((1 << 5) | (5 << 3)); | |
396 | added++; | |
397 | } else | |
398 | IWL_ERR(priv, "no valid channel found\n"); | |
399 | return added; | |
400 | } | |
401 | ||
402 | static int iwl_get_channels_for_scan(struct iwl_priv *priv, | |
403 | struct ieee80211_vif *vif, | |
404 | enum ieee80211_band band, | |
405 | u8 is_active, u8 n_probes, | |
406 | struct iwl_scan_channel *scan_ch) | |
407 | { | |
408 | struct ieee80211_channel *chan; | |
409 | const struct ieee80211_supported_band *sband; | |
410 | const struct iwl_channel_info *ch_info; | |
411 | u16 passive_dwell = 0; | |
412 | u16 active_dwell = 0; | |
413 | int added, i; | |
414 | u16 channel; | |
415 | ||
416 | sband = iwl_get_hw_mode(priv, band); | |
417 | if (!sband) | |
418 | return 0; | |
419 | ||
420 | active_dwell = iwl_get_active_dwell_time(priv, band, n_probes); | |
421 | passive_dwell = iwl_get_passive_dwell_time(priv, band); | |
422 | ||
423 | if (passive_dwell <= active_dwell) | |
424 | passive_dwell = active_dwell + 1; | |
425 | ||
426 | for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) { | |
427 | chan = priv->scan_request->channels[i]; | |
428 | ||
429 | if (chan->band != band) | |
430 | continue; | |
431 | ||
432 | channel = chan->hw_value; | |
433 | scan_ch->channel = cpu_to_le16(channel); | |
434 | ||
435 | ch_info = iwl_get_channel_info(priv, band, channel); | |
436 | if (!is_channel_valid(ch_info)) { | |
437 | IWL_DEBUG_SCAN(priv, | |
438 | "Channel %d is INVALID for this band.\n", | |
439 | channel); | |
440 | continue; | |
441 | } | |
442 | ||
443 | if (!is_active || is_channel_passive(ch_info) || | |
444 | (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)) | |
445 | scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; | |
446 | else | |
447 | scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE; | |
448 | ||
449 | if (n_probes) | |
450 | scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes); | |
451 | ||
452 | scan_ch->active_dwell = cpu_to_le16(active_dwell); | |
453 | scan_ch->passive_dwell = cpu_to_le16(passive_dwell); | |
454 | ||
455 | /* Set txpower levels to defaults */ | |
456 | scan_ch->dsp_atten = 110; | |
457 | ||
458 | /* NOTE: if we were doing 6Mb OFDM for scans we'd use | |
459 | * power level: | |
460 | * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; | |
461 | */ | |
462 | if (band == IEEE80211_BAND_5GHZ) | |
463 | scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; | |
464 | else | |
465 | scan_ch->tx_gain = ((1 << 5) | (5 << 3)); | |
466 | ||
467 | IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n", | |
468 | channel, le32_to_cpu(scan_ch->type), | |
469 | (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? | |
470 | "ACTIVE" : "PASSIVE", | |
471 | (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? | |
472 | active_dwell : passive_dwell); | |
473 | ||
474 | scan_ch++; | |
475 | added++; | |
476 | } | |
477 | ||
478 | IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added); | |
479 | return added; | |
480 | } | |
481 | ||
482 | static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif) | |
483 | { | |
484 | struct iwl_host_cmd cmd = { | |
485 | .id = REPLY_SCAN_CMD, | |
486 | .len = { sizeof(struct iwl_scan_cmd), }, | |
487 | .flags = CMD_SYNC, | |
488 | }; | |
489 | struct iwl_scan_cmd *scan; | |
490 | struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS]; | |
491 | u32 rate_flags = 0; | |
492 | u16 cmd_len; | |
493 | u16 rx_chain = 0; | |
494 | enum ieee80211_band band; | |
495 | u8 n_probes = 0; | |
496 | u8 rx_ant = hw_params(priv).valid_rx_ant; | |
497 | u8 rate; | |
498 | bool is_active = false; | |
499 | int chan_mod; | |
500 | u8 active_chains; | |
501 | u8 scan_tx_antennas = hw_params(priv).valid_tx_ant; | |
502 | int ret; | |
503 | ||
504 | lockdep_assert_held(&priv->shrd->mutex); | |
505 | ||
506 | if (vif) | |
507 | ctx = iwl_rxon_ctx_from_vif(vif); | |
508 | ||
509 | if (!priv->scan_cmd) { | |
510 | priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) + | |
511 | IWL_MAX_SCAN_SIZE, GFP_KERNEL); | |
512 | if (!priv->scan_cmd) { | |
513 | IWL_DEBUG_SCAN(priv, | |
514 | "fail to allocate memory for scan\n"); | |
515 | return -ENOMEM; | |
516 | } | |
517 | } | |
518 | scan = priv->scan_cmd; | |
519 | memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE); | |
520 | ||
521 | scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; | |
522 | scan->quiet_time = IWL_ACTIVE_QUIET_TIME; | |
523 | ||
524 | if (priv->scan_type != IWL_SCAN_ROC && | |
525 | iwl_is_any_associated(priv)) { | |
526 | u16 interval = 0; | |
527 | u32 extra; | |
528 | u32 suspend_time = 100; | |
529 | u32 scan_suspend_time = 100; | |
530 | ||
531 | IWL_DEBUG_INFO(priv, "Scanning while associated...\n"); | |
532 | switch (priv->scan_type) { | |
533 | case IWL_SCAN_ROC: | |
534 | WARN_ON(1); | |
535 | break; | |
536 | case IWL_SCAN_RADIO_RESET: | |
537 | interval = 0; | |
538 | break; | |
539 | case IWL_SCAN_NORMAL: | |
540 | interval = vif->bss_conf.beacon_int; | |
541 | break; | |
542 | } | |
543 | ||
544 | scan->suspend_time = 0; | |
545 | scan->max_out_time = cpu_to_le32(200 * 1024); | |
546 | if (!interval) | |
547 | interval = suspend_time; | |
548 | ||
549 | extra = (suspend_time / interval) << 22; | |
550 | scan_suspend_time = (extra | | |
551 | ((suspend_time % interval) * 1024)); | |
552 | scan->suspend_time = cpu_to_le32(scan_suspend_time); | |
553 | IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n", | |
554 | scan_suspend_time, interval); | |
555 | } else if (priv->scan_type == IWL_SCAN_ROC) { | |
556 | scan->suspend_time = 0; | |
557 | scan->max_out_time = 0; | |
558 | scan->quiet_time = 0; | |
559 | scan->quiet_plcp_th = 0; | |
560 | } | |
561 | ||
562 | switch (priv->scan_type) { | |
563 | case IWL_SCAN_RADIO_RESET: | |
564 | IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n"); | |
565 | break; | |
566 | case IWL_SCAN_NORMAL: | |
567 | if (priv->scan_request->n_ssids) { | |
568 | int i, p = 0; | |
569 | IWL_DEBUG_SCAN(priv, "Kicking off active scan\n"); | |
570 | for (i = 0; i < priv->scan_request->n_ssids; i++) { | |
571 | /* always does wildcard anyway */ | |
572 | if (!priv->scan_request->ssids[i].ssid_len) | |
573 | continue; | |
574 | scan->direct_scan[p].id = WLAN_EID_SSID; | |
575 | scan->direct_scan[p].len = | |
576 | priv->scan_request->ssids[i].ssid_len; | |
577 | memcpy(scan->direct_scan[p].ssid, | |
578 | priv->scan_request->ssids[i].ssid, | |
579 | priv->scan_request->ssids[i].ssid_len); | |
580 | n_probes++; | |
581 | p++; | |
582 | } | |
583 | is_active = true; | |
584 | } else | |
585 | IWL_DEBUG_SCAN(priv, "Start passive scan.\n"); | |
586 | break; | |
587 | case IWL_SCAN_ROC: | |
588 | IWL_DEBUG_SCAN(priv, "Start ROC scan.\n"); | |
589 | break; | |
590 | } | |
591 | ||
592 | scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK; | |
593 | scan->tx_cmd.sta_id = ctx->bcast_sta_id; | |
594 | scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; | |
595 | ||
596 | switch (priv->scan_band) { | |
597 | case IEEE80211_BAND_2GHZ: | |
598 | scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; | |
599 | chan_mod = le32_to_cpu( | |
600 | priv->contexts[IWL_RXON_CTX_BSS].active.flags & | |
601 | RXON_FLG_CHANNEL_MODE_MSK) | |
602 | >> RXON_FLG_CHANNEL_MODE_POS; | |
603 | if (chan_mod == CHANNEL_MODE_PURE_40) { | |
604 | rate = IWL_RATE_6M_PLCP; | |
605 | } else { | |
606 | rate = IWL_RATE_1M_PLCP; | |
607 | rate_flags = RATE_MCS_CCK_MSK; | |
608 | } | |
609 | /* | |
610 | * Internal scans are passive, so we can indiscriminately set | |
611 | * the BT ignore flag on 2.4 GHz since it applies to TX only. | |
612 | */ | |
613 | if (priv->cfg->bt_params && | |
614 | priv->cfg->bt_params->advanced_bt_coexist) | |
615 | scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT; | |
616 | break; | |
617 | case IEEE80211_BAND_5GHZ: | |
618 | rate = IWL_RATE_6M_PLCP; | |
619 | break; | |
620 | default: | |
621 | IWL_WARN(priv, "Invalid scan band\n"); | |
622 | return -EIO; | |
623 | } | |
624 | ||
625 | /* | |
626 | * If active scanning is requested but a certain channel is | |
627 | * marked passive, we can do active scanning if we detect | |
628 | * transmissions. | |
629 | * | |
630 | * There is an issue with some firmware versions that triggers | |
631 | * a sysassert on a "good CRC threshold" of zero (== disabled), | |
632 | * on a radar channel even though this means that we should NOT | |
633 | * send probes. | |
634 | * | |
635 | * The "good CRC threshold" is the number of frames that we | |
636 | * need to receive during our dwell time on a channel before | |
637 | * sending out probes -- setting this to a huge value will | |
638 | * mean we never reach it, but at the same time work around | |
639 | * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER | |
640 | * here instead of IWL_GOOD_CRC_TH_DISABLED. | |
641 | * | |
642 | * This was fixed in later versions along with some other | |
643 | * scan changes, and the threshold behaves as a flag in those | |
644 | * versions. | |
645 | */ | |
646 | if (priv->new_scan_threshold_behaviour) | |
647 | scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT : | |
648 | IWL_GOOD_CRC_TH_DISABLED; | |
649 | else | |
650 | scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT : | |
651 | IWL_GOOD_CRC_TH_NEVER; | |
652 | ||
653 | band = priv->scan_band; | |
654 | ||
655 | if (priv->cfg->scan_rx_antennas[band]) | |
656 | rx_ant = priv->cfg->scan_rx_antennas[band]; | |
657 | ||
658 | if (band == IEEE80211_BAND_2GHZ && | |
659 | priv->cfg->bt_params && | |
660 | priv->cfg->bt_params->advanced_bt_coexist) { | |
661 | /* transmit 2.4 GHz probes only on first antenna */ | |
662 | scan_tx_antennas = first_antenna(scan_tx_antennas); | |
663 | } | |
664 | ||
665 | priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv, | |
666 | priv->scan_tx_ant[band], | |
667 | scan_tx_antennas); | |
668 | rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]); | |
669 | scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags); | |
670 | ||
671 | /* In power save mode use one chain, otherwise use all chains */ | |
672 | if (test_bit(STATUS_POWER_PMI, &priv->shrd->status)) { | |
673 | /* rx_ant has been set to all valid chains previously */ | |
674 | active_chains = rx_ant & | |
675 | ((u8)(priv->chain_noise_data.active_chains)); | |
676 | if (!active_chains) | |
677 | active_chains = rx_ant; | |
678 | ||
679 | IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n", | |
680 | priv->chain_noise_data.active_chains); | |
681 | ||
682 | rx_ant = first_antenna(active_chains); | |
683 | } | |
684 | if (priv->cfg->bt_params && | |
685 | priv->cfg->bt_params->advanced_bt_coexist && | |
686 | priv->bt_full_concurrent) { | |
687 | /* operated as 1x1 in full concurrency mode */ | |
688 | rx_ant = first_antenna(rx_ant); | |
689 | } | |
690 | ||
691 | /* MIMO is not used here, but value is required */ | |
692 | rx_chain |= | |
693 | hw_params(priv).valid_rx_ant << RXON_RX_CHAIN_VALID_POS; | |
694 | rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS; | |
695 | rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS; | |
696 | rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS; | |
697 | scan->rx_chain = cpu_to_le16(rx_chain); | |
698 | switch (priv->scan_type) { | |
699 | case IWL_SCAN_NORMAL: | |
700 | cmd_len = iwl_fill_probe_req(priv, | |
701 | (struct ieee80211_mgmt *)scan->data, | |
702 | vif->addr, | |
703 | priv->scan_request->ie, | |
704 | priv->scan_request->ie_len, | |
705 | IWL_MAX_SCAN_SIZE - sizeof(*scan)); | |
706 | break; | |
707 | case IWL_SCAN_RADIO_RESET: | |
708 | case IWL_SCAN_ROC: | |
709 | /* use bcast addr, will not be transmitted but must be valid */ | |
710 | cmd_len = iwl_fill_probe_req(priv, | |
711 | (struct ieee80211_mgmt *)scan->data, | |
712 | iwl_bcast_addr, NULL, 0, | |
713 | IWL_MAX_SCAN_SIZE - sizeof(*scan)); | |
714 | break; | |
715 | default: | |
716 | BUG(); | |
717 | } | |
718 | scan->tx_cmd.len = cpu_to_le16(cmd_len); | |
719 | ||
720 | scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | | |
721 | RXON_FILTER_BCON_AWARE_MSK); | |
722 | ||
723 | switch (priv->scan_type) { | |
724 | case IWL_SCAN_RADIO_RESET: | |
725 | scan->channel_count = | |
726 | iwl_get_single_channel_for_scan(priv, vif, band, | |
727 | (void *)&scan->data[cmd_len]); | |
728 | break; | |
729 | case IWL_SCAN_NORMAL: | |
730 | scan->channel_count = | |
731 | iwl_get_channels_for_scan(priv, vif, band, | |
732 | is_active, n_probes, | |
733 | (void *)&scan->data[cmd_len]); | |
734 | break; | |
735 | case IWL_SCAN_ROC: { | |
736 | struct iwl_scan_channel *scan_ch; | |
390808db JB |
737 | int n_chan, i; |
738 | u16 dwell; | |
739 | ||
740 | dwell = iwl_limit_dwell(priv, priv->hw_roc_duration); | |
741 | n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell); | |
6e809a16 | 742 | |
390808db | 743 | scan->channel_count = n_chan; |
6e809a16 JB |
744 | |
745 | scan_ch = (void *)&scan->data[cmd_len]; | |
6e809a16 | 746 | |
390808db JB |
747 | for (i = 0; i < n_chan; i++) { |
748 | scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; | |
749 | scan_ch->channel = | |
750 | cpu_to_le16(priv->hw_roc_channel->hw_value); | |
6e809a16 | 751 | |
390808db JB |
752 | if (i == n_chan - 1) |
753 | dwell = priv->hw_roc_duration - i * dwell; | |
754 | ||
755 | scan_ch->active_dwell = | |
756 | scan_ch->passive_dwell = cpu_to_le16(dwell); | |
757 | ||
758 | /* Set txpower levels to defaults */ | |
759 | scan_ch->dsp_atten = 110; | |
760 | ||
761 | /* NOTE: if we were doing 6Mb OFDM for scans we'd use | |
762 | * power level: | |
763 | * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; | |
764 | */ | |
765 | if (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ) | |
766 | scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; | |
767 | else | |
768 | scan_ch->tx_gain = ((1 << 5) | (5 << 3)); | |
769 | ||
770 | scan_ch++; | |
6e809a16 | 771 | } |
390808db JB |
772 | } |
773 | ||
6e809a16 JB |
774 | break; |
775 | } | |
776 | ||
777 | if (scan->channel_count == 0) { | |
778 | IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count); | |
779 | return -EIO; | |
780 | } | |
781 | ||
782 | cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) + | |
783 | scan->channel_count * sizeof(struct iwl_scan_channel); | |
784 | cmd.data[0] = scan; | |
785 | cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY; | |
786 | scan->len = cpu_to_le16(cmd.len[0]); | |
787 | ||
788 | /* set scan bit here for PAN params */ | |
789 | set_bit(STATUS_SCAN_HW, &priv->shrd->status); | |
790 | ||
791 | ret = iwlagn_set_pan_params(priv); | |
792 | if (ret) | |
793 | return ret; | |
794 | ||
795 | ret = iwl_trans_send_cmd(trans(priv), &cmd); | |
796 | if (ret) { | |
797 | clear_bit(STATUS_SCAN_HW, &priv->shrd->status); | |
798 | iwlagn_set_pan_params(priv); | |
799 | } | |
800 | ||
801 | return ret; | |
802 | } | |
803 | ||
f53696de TW |
804 | void iwl_init_scan_params(struct iwl_priv *priv) |
805 | { | |
d6189124 | 806 | u8 ant_idx = fls(hw_params(priv).valid_tx_ant) - 1; |
f53696de | 807 | if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ]) |
76eff18b | 808 | priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx; |
f53696de | 809 | if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ]) |
76eff18b | 810 | priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx; |
f53696de TW |
811 | } |
812 | ||
266af4c7 JB |
813 | int __must_check iwl_scan_initiate(struct iwl_priv *priv, |
814 | struct ieee80211_vif *vif, | |
815 | enum iwl_scan_type scan_type, | |
816 | enum ieee80211_band band) | |
2a421b91 | 817 | { |
3eecce52 JB |
818 | int ret; |
819 | ||
6ac2f839 | 820 | lockdep_assert_held(&priv->shrd->mutex); |
88be0264 | 821 | |
3eecce52 JB |
822 | cancel_delayed_work(&priv->scan_check); |
823 | ||
845a9c0d | 824 | if (!iwl_is_ready_rf(priv->shrd)) { |
7cf24421 | 825 | IWL_WARN(priv, "Request scan called when driver not ready.\n"); |
3eecce52 JB |
826 | return -EIO; |
827 | } | |
828 | ||
63013ae3 | 829 | if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) { |
7cf24421 | 830 | IWL_DEBUG_SCAN(priv, |
3eecce52 JB |
831 | "Multiple concurrent scan requests in parallel.\n"); |
832 | return -EBUSY; | |
833 | } | |
834 | ||
63013ae3 | 835 | if (test_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) { |
7cf24421 | 836 | IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n"); |
3eecce52 JB |
837 | return -EBUSY; |
838 | } | |
839 | ||
7cf24421 | 840 | IWL_DEBUG_SCAN(priv, "Starting %sscan...\n", |
266af4c7 | 841 | scan_type == IWL_SCAN_NORMAL ? "" : |
c6baf7fb | 842 | scan_type == IWL_SCAN_ROC ? "remain-on-channel " : |
266af4c7 | 843 | "internal short "); |
3eecce52 | 844 | |
63013ae3 | 845 | set_bit(STATUS_SCANNING, &priv->shrd->status); |
266af4c7 | 846 | priv->scan_type = scan_type; |
2a421b91 | 847 | priv->scan_start = jiffies; |
3eecce52 | 848 | priv->scan_band = band; |
2a421b91 | 849 | |
5c3d29fc | 850 | ret = iwlagn_request_scan(priv, vif); |
3eecce52 | 851 | if (ret) { |
63013ae3 | 852 | clear_bit(STATUS_SCANNING, &priv->shrd->status); |
266af4c7 | 853 | priv->scan_type = IWL_SCAN_NORMAL; |
3eecce52 JB |
854 | return ret; |
855 | } | |
b6e4c55a | 856 | |
74e28e44 | 857 | queue_delayed_work(priv->shrd->workqueue, &priv->scan_check, |
3eecce52 | 858 | IWL_SCAN_CHECK_WATCHDOG); |
2a421b91 TW |
859 | |
860 | return 0; | |
861 | } | |
2a421b91 | 862 | |
e9dde6f6 | 863 | int iwl_mac_hw_scan(struct ieee80211_hw *hw, |
a060bbfe JB |
864 | struct ieee80211_vif *vif, |
865 | struct cfg80211_scan_request *req) | |
e9dde6f6 | 866 | { |
e9dde6f6 | 867 | struct iwl_priv *priv = hw->priv; |
00700ee0 | 868 | int ret; |
e9dde6f6 AK |
869 | |
870 | IWL_DEBUG_MAC80211(priv, "enter\n"); | |
871 | ||
00700ee0 JB |
872 | if (req->n_channels == 0) |
873 | return -EINVAL; | |
874 | ||
6ac2f839 | 875 | mutex_lock(&priv->shrd->mutex); |
e9dde6f6 | 876 | |
63013ae3 | 877 | if (test_bit(STATUS_SCANNING, &priv->shrd->status) && |
266af4c7 | 878 | priv->scan_type != IWL_SCAN_NORMAL) { |
bbcbb9ef RC |
879 | IWL_DEBUG_SCAN(priv, "Scan already in progress.\n"); |
880 | ret = -EAGAIN; | |
881 | goto out_unlock; | |
882 | } | |
883 | ||
00700ee0 | 884 | /* mac80211 will only ask for one band at a time */ |
1ecf9fc1 | 885 | priv->scan_request = req; |
f84b29ec | 886 | priv->scan_vif = vif; |
e9dde6f6 | 887 | |
f84b29ec JB |
888 | /* |
889 | * If an internal scan is in progress, just set | |
890 | * up the scan_request as per above. | |
891 | */ | |
266af4c7 | 892 | if (priv->scan_type != IWL_SCAN_NORMAL) { |
7cf24421 | 893 | IWL_DEBUG_SCAN(priv, "SCAN request during internal scan\n"); |
f84b29ec | 894 | ret = 0; |
7cf24421 | 895 | } else |
266af4c7 | 896 | ret = iwl_scan_initiate(priv, vif, IWL_SCAN_NORMAL, |
3eecce52 | 897 | req->channels[0]->band); |
e9dde6f6 AK |
898 | |
899 | IWL_DEBUG_MAC80211(priv, "leave\n"); | |
900 | ||
901 | out_unlock: | |
6ac2f839 | 902 | mutex_unlock(&priv->shrd->mutex); |
e9dde6f6 AK |
903 | |
904 | return ret; | |
905 | } | |
e9dde6f6 | 906 | |
afbdd69a WYG |
907 | /* |
908 | * internal short scan, this function should only been called while associated. | |
909 | * It will reset and tune the radio to prevent possible RF related problem | |
910 | */ | |
88be0264 | 911 | void iwl_internal_short_hw_scan(struct iwl_priv *priv) |
afbdd69a | 912 | { |
74e28e44 | 913 | queue_work(priv->shrd->workqueue, &priv->start_internal_scan); |
88be0264 JB |
914 | } |
915 | ||
c240879f | 916 | static void iwl_bg_start_internal_scan(struct work_struct *work) |
88be0264 JB |
917 | { |
918 | struct iwl_priv *priv = | |
919 | container_of(work, struct iwl_priv, start_internal_scan); | |
920 | ||
7cf24421 SG |
921 | IWL_DEBUG_SCAN(priv, "Start internal scan\n"); |
922 | ||
6ac2f839 | 923 | mutex_lock(&priv->shrd->mutex); |
afbdd69a | 924 | |
266af4c7 | 925 | if (priv->scan_type == IWL_SCAN_RADIO_RESET) { |
073d5eab RC |
926 | IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n"); |
927 | goto unlock; | |
928 | } | |
929 | ||
63013ae3 | 930 | if (test_bit(STATUS_SCANNING, &priv->shrd->status)) { |
afbdd69a | 931 | IWL_DEBUG_SCAN(priv, "Scan already in progress.\n"); |
88be0264 | 932 | goto unlock; |
afbdd69a | 933 | } |
88be0264 | 934 | |
266af4c7 | 935 | if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band)) |
3eecce52 | 936 | IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n"); |
88be0264 | 937 | unlock: |
6ac2f839 | 938 | mutex_unlock(&priv->shrd->mutex); |
afbdd69a | 939 | } |
afbdd69a | 940 | |
c240879f | 941 | static void iwl_bg_scan_check(struct work_struct *data) |
2a421b91 TW |
942 | { |
943 | struct iwl_priv *priv = | |
944 | container_of(data, struct iwl_priv, scan_check.work); | |
945 | ||
7cf24421 SG |
946 | IWL_DEBUG_SCAN(priv, "Scan check work\n"); |
947 | ||
e7e16b90 SG |
948 | /* Since we are here firmware does not finish scan and |
949 | * most likely is in bad shape, so we don't bother to | |
950 | * send abort command, just force scan complete to mac80211 */ | |
6ac2f839 | 951 | mutex_lock(&priv->shrd->mutex); |
e7e16b90 | 952 | iwl_force_scan_end(priv); |
6ac2f839 | 953 | mutex_unlock(&priv->shrd->mutex); |
2a421b91 | 954 | } |
77fecfb8 | 955 | |
2a421b91 TW |
956 | /** |
957 | * iwl_fill_probe_req - fill in all required fields and IE for probe request | |
958 | */ | |
f53696de | 959 | |
1ecf9fc1 | 960 | u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame, |
3a0b9aad | 961 | const u8 *ta, const u8 *ies, int ie_len, int left) |
2a421b91 TW |
962 | { |
963 | int len = 0; | |
964 | u8 *pos = NULL; | |
f53696de | 965 | |
2a421b91 TW |
966 | /* Make sure there is enough space for the probe request, |
967 | * two mandatory IEs and the data */ | |
968 | left -= 24; | |
969 | if (left < 0) | |
970 | return 0; | |
2a421b91 TW |
971 | |
972 | frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ); | |
973 | memcpy(frame->da, iwl_bcast_addr, ETH_ALEN); | |
3a0b9aad | 974 | memcpy(frame->sa, ta, ETH_ALEN); |
2a421b91 TW |
975 | memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN); |
976 | frame->seq_ctrl = 0; | |
977 | ||
f53696de TW |
978 | len += 24; |
979 | ||
2a421b91 | 980 | /* ...next IE... */ |
f53696de | 981 | pos = &frame->u.probe_req.variable[0]; |
2a421b91 | 982 | |
f53696de | 983 | /* fill in our indirect SSID IE */ |
2a421b91 TW |
984 | left -= 2; |
985 | if (left < 0) | |
986 | return 0; | |
2a421b91 | 987 | *pos++ = WLAN_EID_SSID; |
1382c71c RC |
988 | *pos++ = 0; |
989 | ||
990 | len += 2; | |
2a421b91 | 991 | |
1ecf9fc1 JB |
992 | if (WARN_ON(left < ie_len)) |
993 | return len; | |
2a421b91 | 994 | |
eb2ec0fb | 995 | if (ies && ie_len) { |
afbdd69a | 996 | memcpy(pos, ies, ie_len); |
eb2ec0fb SG |
997 | len += ie_len; |
998 | } | |
f53696de | 999 | |
2a421b91 TW |
1000 | return (u16)len; |
1001 | } | |
1002 | ||
c240879f | 1003 | static void iwl_bg_abort_scan(struct work_struct *work) |
2a421b91 TW |
1004 | { |
1005 | struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan); | |
1006 | ||
7cf24421 SG |
1007 | IWL_DEBUG_SCAN(priv, "Abort scan work\n"); |
1008 | ||
e7e16b90 SG |
1009 | /* We keep scan_check work queued in case when firmware will not |
1010 | * report back scan completed notification */ | |
6ac2f839 | 1011 | mutex_lock(&priv->shrd->mutex); |
6bd1758d | 1012 | iwl_scan_cancel_timeout(priv, 200); |
6ac2f839 | 1013 | mutex_unlock(&priv->shrd->mutex); |
2a421b91 TW |
1014 | } |
1015 | ||
c240879f | 1016 | static void iwl_bg_scan_completed(struct work_struct *work) |
eedda367 TW |
1017 | { |
1018 | struct iwl_priv *priv = | |
1019 | container_of(work, struct iwl_priv, scan_completed); | |
02d8c14b | 1020 | bool aborted; |
eedda367 | 1021 | |
266af4c7 | 1022 | IWL_DEBUG_SCAN(priv, "Completed scan.\n"); |
eedda367 | 1023 | |
fbc9f97b RC |
1024 | cancel_delayed_work(&priv->scan_check); |
1025 | ||
6ac2f839 | 1026 | mutex_lock(&priv->shrd->mutex); |
d5926d9d | 1027 | |
63013ae3 | 1028 | aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status); |
d5926d9d | 1029 | if (aborted) |
7cf24421 | 1030 | IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n"); |
d5926d9d | 1031 | |
63013ae3 | 1032 | if (!test_and_clear_bit(STATUS_SCANNING, &priv->shrd->status)) { |
7cf24421 | 1033 | IWL_DEBUG_SCAN(priv, "Scan already completed.\n"); |
3a160a5b | 1034 | goto out_settings; |
afbdd69a | 1035 | } |
f84b29ec | 1036 | |
c6baf7fb JB |
1037 | if (priv->scan_type == IWL_SCAN_ROC) { |
1038 | ieee80211_remain_on_channel_expired(priv->hw); | |
1039 | priv->hw_roc_channel = NULL; | |
1040 | schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ); | |
266af4c7 JB |
1041 | } |
1042 | ||
1043 | if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) { | |
02d8c14b | 1044 | int err; |
f84b29ec | 1045 | |
02d8c14b SG |
1046 | /* Check if mac80211 requested scan during our internal scan */ |
1047 | if (priv->scan_request == NULL) | |
1048 | goto out_complete; | |
3eecce52 | 1049 | |
02d8c14b | 1050 | /* If so request a new scan */ |
266af4c7 | 1051 | err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL, |
02d8c14b | 1052 | priv->scan_request->channels[0]->band); |
3eecce52 JB |
1053 | if (err) { |
1054 | IWL_DEBUG_SCAN(priv, | |
1055 | "failed to initiate pending scan: %d\n", err); | |
02d8c14b SG |
1056 | aborted = true; |
1057 | goto out_complete; | |
1058 | } | |
1059 | ||
1060 | goto out; | |
3eecce52 | 1061 | } |
f84b29ec | 1062 | |
02d8c14b SG |
1063 | out_complete: |
1064 | iwl_complete_scan(priv, aborted); | |
1065 | ||
3a160a5b | 1066 | out_settings: |
02d8c14b | 1067 | /* Can we still talk to firmware ? */ |
845a9c0d | 1068 | if (!iwl_is_ready_rf(priv->shrd)) |
02d8c14b SG |
1069 | goto out; |
1070 | ||
e80d70e9 | 1071 | iwlagn_post_scan(priv); |
52a02d15 | 1072 | |
a25a66ac | 1073 | out: |
6ac2f839 | 1074 | mutex_unlock(&priv->shrd->mutex); |
eedda367 | 1075 | } |
eedda367 | 1076 | |
2a421b91 TW |
1077 | void iwl_setup_scan_deferred_work(struct iwl_priv *priv) |
1078 | { | |
eedda367 | 1079 | INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); |
2a421b91 | 1080 | INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan); |
88be0264 | 1081 | INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan); |
2a421b91 TW |
1082 | INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check); |
1083 | } | |
2a421b91 | 1084 | |
e7e16b90 SG |
1085 | void iwl_cancel_scan_deferred_work(struct iwl_priv *priv) |
1086 | { | |
1087 | cancel_work_sync(&priv->start_internal_scan); | |
1088 | cancel_work_sync(&priv->abort_scan); | |
1089 | cancel_work_sync(&priv->scan_completed); | |
1090 | ||
1091 | if (cancel_delayed_work_sync(&priv->scan_check)) { | |
6ac2f839 | 1092 | mutex_lock(&priv->shrd->mutex); |
e7e16b90 | 1093 | iwl_force_scan_end(priv); |
6ac2f839 | 1094 | mutex_unlock(&priv->shrd->mutex); |
e7e16b90 SG |
1095 | } |
1096 | } |