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2a421b91 TW |
1 | /****************************************************************************** |
2 | * | |
3 | * GPL LICENSE SUMMARY | |
4 | * | |
01f8162a | 5 | * Copyright(c) 2008 - 2009 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 | */ | |
63 | int 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 | } | |
84 | EXPORT_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 | */ | |
91 | int 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 | } | |
109 | EXPORT_SYMBOL(iwl_scan_cancel_timeout); | |
110 | ||
4e05c234 | 111 | static 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) */ | |
153 | static 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) */ | |
166 | static 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) */ | |
184 | static 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 " | |
195 | "elapsed=%lu usec (%dms since last)\n", | |
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]), | |
201 | le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf, | |
202 | jiffies_to_msecs(elapsed_jiffies | |
203 | (priv->last_scan_jiffies, jiffies))); | |
204 | #endif | |
205 | ||
206 | priv->last_scan_jiffies = jiffies; | |
207 | priv->next_scan_jiffies = 0; | |
208 | } | |
209 | ||
210 | /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ | |
211 | static void iwl_rx_scan_complete_notif(struct iwl_priv *priv, | |
212 | struct iwl_rx_mem_buffer *rxb) | |
213 | { | |
cb9289cb | 214 | #ifdef CONFIG_IWLWIFI_DEBUG |
2f301227 | 215 | struct iwl_rx_packet *pkt = rxb_addr(rxb); |
2a421b91 TW |
216 | struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw; |
217 | ||
e1623446 | 218 | IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n", |
2a421b91 TW |
219 | scan_notif->scanned_channels, |
220 | scan_notif->tsf_low, | |
221 | scan_notif->tsf_high, scan_notif->status); | |
cb9289cb | 222 | #endif |
2a421b91 TW |
223 | |
224 | /* The HW is no longer scanning */ | |
225 | clear_bit(STATUS_SCAN_HW, &priv->status); | |
226 | ||
e1623446 | 227 | IWL_DEBUG_INFO(priv, "Scan pass on %sGHz took %dms\n", |
1b63ba8a DM |
228 | (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ? |
229 | "2.4" : "5.2", | |
2a421b91 TW |
230 | jiffies_to_msecs(elapsed_jiffies |
231 | (priv->scan_pass_start, jiffies))); | |
232 | ||
1b63ba8a DM |
233 | /* Remove this scanned band from the list of pending |
234 | * bands to scan, band G precedes A in order of scanning | |
235 | * as seen in iwl_bg_request_scan */ | |
236 | if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) | |
237 | priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ); | |
238 | else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) | |
239 | priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ); | |
2a421b91 TW |
240 | |
241 | /* If a request to abort was given, or the scan did not succeed | |
242 | * then we reset the scan state machine and terminate, | |
243 | * re-queuing another scan if one has been requested */ | |
244 | if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
e1623446 | 245 | IWL_DEBUG_INFO(priv, "Aborted scan completed.\n"); |
2a421b91 TW |
246 | clear_bit(STATUS_SCAN_ABORTING, &priv->status); |
247 | } else { | |
248 | /* If there are more bands on this scan pass reschedule */ | |
1b63ba8a | 249 | if (priv->scan_bands) |
2a421b91 TW |
250 | goto reschedule; |
251 | } | |
252 | ||
253 | priv->last_scan_jiffies = jiffies; | |
254 | priv->next_scan_jiffies = 0; | |
e1623446 | 255 | IWL_DEBUG_INFO(priv, "Setting scan to off\n"); |
2a421b91 TW |
256 | |
257 | clear_bit(STATUS_SCANNING, &priv->status); | |
258 | ||
e1623446 | 259 | IWL_DEBUG_INFO(priv, "Scan took %dms\n", |
2a421b91 TW |
260 | jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies))); |
261 | ||
262 | queue_work(priv->workqueue, &priv->scan_completed); | |
263 | ||
264 | return; | |
265 | ||
266 | reschedule: | |
267 | priv->scan_pass_start = jiffies; | |
268 | queue_work(priv->workqueue, &priv->request_scan); | |
269 | } | |
270 | ||
271 | void iwl_setup_rx_scan_handlers(struct iwl_priv *priv) | |
272 | { | |
273 | /* scan handlers */ | |
274 | priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan; | |
275 | priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif; | |
276 | priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] = | |
277 | iwl_rx_scan_results_notif; | |
278 | priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] = | |
279 | iwl_rx_scan_complete_notif; | |
280 | } | |
281 | EXPORT_SYMBOL(iwl_setup_rx_scan_handlers); | |
282 | ||
77fecfb8 SO |
283 | inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv, |
284 | enum ieee80211_band band, | |
285 | u8 n_probes) | |
2a421b91 TW |
286 | { |
287 | if (band == IEEE80211_BAND_5GHZ) | |
fe905f1d TW |
288 | return IWL_ACTIVE_DWELL_TIME_52 + |
289 | IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1); | |
2a421b91 | 290 | else |
fe905f1d TW |
291 | return IWL_ACTIVE_DWELL_TIME_24 + |
292 | IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1); | |
2a421b91 | 293 | } |
77fecfb8 | 294 | EXPORT_SYMBOL(iwl_get_active_dwell_time); |
2a421b91 | 295 | |
77fecfb8 SO |
296 | u16 iwl_get_passive_dwell_time(struct iwl_priv *priv, |
297 | enum ieee80211_band band) | |
2a421b91 | 298 | { |
fe905f1d | 299 | u16 passive = (band == IEEE80211_BAND_2GHZ) ? |
2a421b91 TW |
300 | IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 : |
301 | IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52; | |
302 | ||
303 | if (iwl_is_associated(priv)) { | |
304 | /* If we're associated, we clamp the maximum passive | |
305 | * dwell time to be 98% of the beacon interval (minus | |
306 | * 2 * channel tune time) */ | |
307 | passive = priv->beacon_int; | |
308 | if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive) | |
309 | passive = IWL_PASSIVE_DWELL_BASE; | |
310 | passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; | |
311 | } | |
312 | ||
2a421b91 TW |
313 | return passive; |
314 | } | |
77fecfb8 | 315 | EXPORT_SYMBOL(iwl_get_passive_dwell_time); |
2a421b91 TW |
316 | |
317 | static int iwl_get_channels_for_scan(struct iwl_priv *priv, | |
318 | enum ieee80211_band band, | |
fe905f1d | 319 | u8 is_active, u8 n_probes, |
2a421b91 TW |
320 | struct iwl_scan_channel *scan_ch) |
321 | { | |
4e05c234 | 322 | struct ieee80211_channel *chan; |
2a421b91 TW |
323 | const struct ieee80211_supported_band *sband; |
324 | const struct iwl_channel_info *ch_info; | |
325 | u16 passive_dwell = 0; | |
326 | u16 active_dwell = 0; | |
327 | int added, i; | |
d16dc48a | 328 | u16 channel; |
2a421b91 TW |
329 | |
330 | sband = iwl_get_hw_mode(priv, band); | |
331 | if (!sband) | |
332 | return 0; | |
333 | ||
fe905f1d | 334 | active_dwell = iwl_get_active_dwell_time(priv, band, n_probes); |
2a421b91 TW |
335 | passive_dwell = iwl_get_passive_dwell_time(priv, band); |
336 | ||
fe905f1d TW |
337 | if (passive_dwell <= active_dwell) |
338 | passive_dwell = active_dwell + 1; | |
339 | ||
4e05c234 JB |
340 | for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) { |
341 | chan = priv->scan_request->channels[i]; | |
342 | ||
343 | if (chan->band != band) | |
2a421b91 TW |
344 | continue; |
345 | ||
4e05c234 | 346 | channel = ieee80211_frequency_to_channel(chan->center_freq); |
d16dc48a | 347 | scan_ch->channel = cpu_to_le16(channel); |
2a421b91 | 348 | |
d16dc48a | 349 | ch_info = iwl_get_channel_info(priv, band, channel); |
2a421b91 | 350 | if (!is_channel_valid(ch_info)) { |
e1623446 | 351 | IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n", |
d16dc48a | 352 | channel); |
2a421b91 TW |
353 | continue; |
354 | } | |
355 | ||
356 | if (!is_active || is_channel_passive(ch_info) || | |
4e05c234 | 357 | (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)) |
d16dc48a | 358 | scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; |
2a421b91 | 359 | else |
d16dc48a | 360 | scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE; |
2a421b91 | 361 | |
0ffe014a | 362 | if (n_probes) |
fe905f1d | 363 | scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes); |
2a421b91 TW |
364 | |
365 | scan_ch->active_dwell = cpu_to_le16(active_dwell); | |
366 | scan_ch->passive_dwell = cpu_to_le16(passive_dwell); | |
367 | ||
368 | /* Set txpower levels to defaults */ | |
f53696de | 369 | scan_ch->dsp_atten = 110; |
2a421b91 | 370 | |
fe905f1d TW |
371 | /* NOTE: if we were doing 6Mb OFDM for scans we'd use |
372 | * power level: | |
373 | * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; | |
374 | */ | |
2a421b91 | 375 | if (band == IEEE80211_BAND_5GHZ) |
f53696de | 376 | scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; |
fe905f1d | 377 | else |
f53696de | 378 | scan_ch->tx_gain = ((1 << 5) | (5 << 3)); |
2a421b91 | 379 | |
e1623446 | 380 | IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n", |
fe905f1d | 381 | channel, le32_to_cpu(scan_ch->type), |
d16dc48a TW |
382 | (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? |
383 | "ACTIVE" : "PASSIVE", | |
384 | (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? | |
2a421b91 TW |
385 | active_dwell : passive_dwell); |
386 | ||
387 | scan_ch++; | |
388 | added++; | |
389 | } | |
390 | ||
e1623446 | 391 | IWL_DEBUG_SCAN(priv, "total channels to scan %d \n", added); |
2a421b91 TW |
392 | return added; |
393 | } | |
394 | ||
f53696de TW |
395 | void iwl_init_scan_params(struct iwl_priv *priv) |
396 | { | |
76eff18b | 397 | u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1; |
f53696de | 398 | if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ]) |
76eff18b | 399 | priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx; |
f53696de | 400 | if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ]) |
76eff18b | 401 | priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx; |
f53696de | 402 | } |
89f186a8 | 403 | EXPORT_SYMBOL(iwl_init_scan_params); |
f53696de | 404 | |
4e05c234 | 405 | static int iwl_scan_initiate(struct iwl_priv *priv) |
2a421b91 | 406 | { |
2a421b91 | 407 | if (!iwl_is_ready_rf(priv)) { |
e1623446 | 408 | IWL_DEBUG_SCAN(priv, "Aborting scan due to not ready.\n"); |
2a421b91 TW |
409 | return -EIO; |
410 | } | |
411 | ||
412 | if (test_bit(STATUS_SCANNING, &priv->status)) { | |
e1623446 | 413 | IWL_DEBUG_SCAN(priv, "Scan already in progress.\n"); |
2a421b91 TW |
414 | return -EAGAIN; |
415 | } | |
416 | ||
417 | if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
e1623446 | 418 | IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n"); |
2a421b91 TW |
419 | return -EAGAIN; |
420 | } | |
421 | ||
e1623446 | 422 | IWL_DEBUG_INFO(priv, "Starting scan...\n"); |
2a421b91 TW |
423 | set_bit(STATUS_SCANNING, &priv->status); |
424 | priv->scan_start = jiffies; | |
425 | priv->scan_pass_start = priv->scan_start; | |
426 | ||
427 | queue_work(priv->workqueue, &priv->request_scan); | |
428 | ||
429 | return 0; | |
430 | } | |
2a421b91 | 431 | |
e9dde6f6 AK |
432 | #define IWL_DELAY_NEXT_SCAN (HZ*2) |
433 | ||
434 | int iwl_mac_hw_scan(struct ieee80211_hw *hw, | |
435 | struct cfg80211_scan_request *req) | |
436 | { | |
437 | unsigned long flags; | |
438 | struct iwl_priv *priv = hw->priv; | |
4e05c234 | 439 | int ret, i; |
e9dde6f6 AK |
440 | |
441 | IWL_DEBUG_MAC80211(priv, "enter\n"); | |
442 | ||
443 | mutex_lock(&priv->mutex); | |
444 | spin_lock_irqsave(&priv->lock, flags); | |
445 | ||
446 | if (!iwl_is_ready_rf(priv)) { | |
447 | ret = -EIO; | |
448 | IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n"); | |
449 | goto out_unlock; | |
450 | } | |
451 | ||
452 | /* We don't schedule scan within next_scan_jiffies period. | |
453 | * Avoid scanning during possible EAPOL exchange, return | |
454 | * success immediately. | |
455 | */ | |
456 | if (priv->next_scan_jiffies && | |
457 | time_after(priv->next_scan_jiffies, jiffies)) { | |
458 | IWL_DEBUG_SCAN(priv, "scan rejected: within next scan period\n"); | |
459 | queue_work(priv->workqueue, &priv->scan_completed); | |
460 | ret = 0; | |
461 | goto out_unlock; | |
462 | } | |
463 | ||
464 | /* if we just finished scan ask for delay */ | |
465 | if (iwl_is_associated(priv) && priv->last_scan_jiffies && | |
466 | time_after(priv->last_scan_jiffies + IWL_DELAY_NEXT_SCAN, jiffies)) { | |
467 | IWL_DEBUG_SCAN(priv, "scan rejected: within previous scan period\n"); | |
468 | queue_work(priv->workqueue, &priv->scan_completed); | |
469 | ret = 0; | |
470 | goto out_unlock; | |
471 | } | |
472 | ||
4e05c234 JB |
473 | priv->scan_bands = 0; |
474 | for (i = 0; i < req->n_channels; i++) | |
475 | priv->scan_bands |= BIT(req->channels[i]->band); | |
476 | ||
1ecf9fc1 | 477 | priv->scan_request = req; |
e9dde6f6 AK |
478 | |
479 | ret = iwl_scan_initiate(priv); | |
480 | ||
481 | IWL_DEBUG_MAC80211(priv, "leave\n"); | |
482 | ||
483 | out_unlock: | |
484 | spin_unlock_irqrestore(&priv->lock, flags); | |
485 | mutex_unlock(&priv->mutex); | |
486 | ||
487 | return ret; | |
488 | } | |
489 | EXPORT_SYMBOL(iwl_mac_hw_scan); | |
490 | ||
2a421b91 TW |
491 | #define IWL_SCAN_CHECK_WATCHDOG (7 * HZ) |
492 | ||
77fecfb8 | 493 | void iwl_bg_scan_check(struct work_struct *data) |
2a421b91 TW |
494 | { |
495 | struct iwl_priv *priv = | |
496 | container_of(data, struct iwl_priv, scan_check.work); | |
497 | ||
498 | if (test_bit(STATUS_EXIT_PENDING, &priv->status)) | |
499 | return; | |
500 | ||
501 | mutex_lock(&priv->mutex); | |
502 | if (test_bit(STATUS_SCANNING, &priv->status) || | |
503 | test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
e1623446 | 504 | IWL_DEBUG_SCAN(priv, "Scan completion watchdog resetting " |
2a421b91 TW |
505 | "adapter (%dms)\n", |
506 | jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG)); | |
507 | ||
508 | if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) | |
509 | iwl_send_scan_abort(priv); | |
510 | } | |
511 | mutex_unlock(&priv->mutex); | |
512 | } | |
77fecfb8 SO |
513 | EXPORT_SYMBOL(iwl_bg_scan_check); |
514 | ||
2a421b91 TW |
515 | /** |
516 | * iwl_fill_probe_req - fill in all required fields and IE for probe request | |
517 | */ | |
f53696de | 518 | |
1ecf9fc1 JB |
519 | u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame, |
520 | const u8 *ies, int ie_len, int left) | |
2a421b91 TW |
521 | { |
522 | int len = 0; | |
523 | u8 *pos = NULL; | |
f53696de | 524 | |
2a421b91 TW |
525 | /* Make sure there is enough space for the probe request, |
526 | * two mandatory IEs and the data */ | |
527 | left -= 24; | |
528 | if (left < 0) | |
529 | return 0; | |
2a421b91 TW |
530 | |
531 | frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ); | |
532 | memcpy(frame->da, iwl_bcast_addr, ETH_ALEN); | |
533 | memcpy(frame->sa, priv->mac_addr, ETH_ALEN); | |
534 | memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN); | |
535 | frame->seq_ctrl = 0; | |
536 | ||
f53696de TW |
537 | len += 24; |
538 | ||
2a421b91 | 539 | /* ...next IE... */ |
f53696de | 540 | pos = &frame->u.probe_req.variable[0]; |
2a421b91 | 541 | |
f53696de | 542 | /* fill in our indirect SSID IE */ |
2a421b91 TW |
543 | left -= 2; |
544 | if (left < 0) | |
545 | return 0; | |
2a421b91 TW |
546 | *pos++ = WLAN_EID_SSID; |
547 | *pos++ = 0; | |
548 | ||
f53696de | 549 | len += 2; |
2a421b91 | 550 | |
1ecf9fc1 JB |
551 | if (WARN_ON(left < ie_len)) |
552 | return len; | |
2a421b91 | 553 | |
1ecf9fc1 JB |
554 | memcpy(pos, ies, ie_len); |
555 | len += ie_len; | |
556 | left -= ie_len; | |
f53696de | 557 | |
2a421b91 TW |
558 | return (u16)len; |
559 | } | |
77fecfb8 | 560 | EXPORT_SYMBOL(iwl_fill_probe_req); |
2a421b91 TW |
561 | |
562 | static void iwl_bg_request_scan(struct work_struct *data) | |
563 | { | |
564 | struct iwl_priv *priv = | |
565 | container_of(data, struct iwl_priv, request_scan); | |
566 | struct iwl_host_cmd cmd = { | |
567 | .id = REPLY_SCAN_CMD, | |
568 | .len = sizeof(struct iwl_scan_cmd), | |
c2acea8e | 569 | .flags = CMD_SIZE_HUGE, |
2a421b91 TW |
570 | }; |
571 | struct iwl_scan_cmd *scan; | |
572 | struct ieee80211_conf *conf = NULL; | |
f53696de | 573 | int ret = 0; |
76eff18b | 574 | u32 rate_flags = 0; |
2a421b91 | 575 | u16 cmd_len; |
fff7a434 | 576 | u16 rx_chain = 0; |
2a421b91 | 577 | enum ieee80211_band band; |
1ecf9fc1 | 578 | u8 n_probes = 0; |
fff7a434 | 579 | u8 rx_ant = priv->hw_params.valid_rx_ant; |
76eff18b | 580 | u8 rate; |
1ecf9fc1 | 581 | bool is_active = false; |
a2b0f02e | 582 | int chan_mod; |
f1e3d7d4 | 583 | u8 active_chains; |
2a421b91 TW |
584 | |
585 | conf = ieee80211_get_hw_conf(priv->hw); | |
586 | ||
587 | mutex_lock(&priv->mutex); | |
588 | ||
fbc9f97b RC |
589 | cancel_delayed_work(&priv->scan_check); |
590 | ||
2a421b91 | 591 | if (!iwl_is_ready(priv)) { |
39aadf8c | 592 | IWL_WARN(priv, "request scan called when driver not ready.\n"); |
2a421b91 TW |
593 | goto done; |
594 | } | |
595 | ||
a96a27f9 | 596 | /* Make sure the scan wasn't canceled before this queued work |
2a421b91 TW |
597 | * was given the chance to run... */ |
598 | if (!test_bit(STATUS_SCANNING, &priv->status)) | |
599 | goto done; | |
600 | ||
601 | /* This should never be called or scheduled if there is currently | |
602 | * a scan active in the hardware. */ | |
603 | if (test_bit(STATUS_SCAN_HW, &priv->status)) { | |
e1623446 | 604 | IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. " |
2a421b91 TW |
605 | "Ignoring second request.\n"); |
606 | ret = -EIO; | |
607 | goto done; | |
608 | } | |
609 | ||
610 | if (test_bit(STATUS_EXIT_PENDING, &priv->status)) { | |
e1623446 | 611 | IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n"); |
2a421b91 TW |
612 | goto done; |
613 | } | |
614 | ||
615 | if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
e1623446 | 616 | IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n"); |
2a421b91 TW |
617 | goto done; |
618 | } | |
619 | ||
620 | if (iwl_is_rfkill(priv)) { | |
e1623446 | 621 | IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n"); |
2a421b91 TW |
622 | goto done; |
623 | } | |
624 | ||
625 | if (!test_bit(STATUS_READY, &priv->status)) { | |
e1623446 | 626 | IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n"); |
2a421b91 TW |
627 | goto done; |
628 | } | |
629 | ||
630 | if (!priv->scan_bands) { | |
e1623446 | 631 | IWL_DEBUG_HC(priv, "Aborting scan due to no requested bands\n"); |
2a421b91 TW |
632 | goto done; |
633 | } | |
634 | ||
635 | if (!priv->scan) { | |
636 | priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) + | |
637 | IWL_MAX_SCAN_SIZE, GFP_KERNEL); | |
638 | if (!priv->scan) { | |
639 | ret = -ENOMEM; | |
640 | goto done; | |
641 | } | |
642 | } | |
643 | scan = priv->scan; | |
644 | memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE); | |
645 | ||
646 | scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; | |
647 | scan->quiet_time = IWL_ACTIVE_QUIET_TIME; | |
648 | ||
649 | if (iwl_is_associated(priv)) { | |
650 | u16 interval = 0; | |
651 | u32 extra; | |
652 | u32 suspend_time = 100; | |
653 | u32 scan_suspend_time = 100; | |
654 | unsigned long flags; | |
655 | ||
e1623446 | 656 | IWL_DEBUG_INFO(priv, "Scanning while associated...\n"); |
2a421b91 TW |
657 | |
658 | spin_lock_irqsave(&priv->lock, flags); | |
659 | interval = priv->beacon_int; | |
660 | spin_unlock_irqrestore(&priv->lock, flags); | |
661 | ||
662 | scan->suspend_time = 0; | |
663 | scan->max_out_time = cpu_to_le32(200 * 1024); | |
664 | if (!interval) | |
665 | interval = suspend_time; | |
666 | ||
667 | extra = (suspend_time / interval) << 22; | |
668 | scan_suspend_time = (extra | | |
669 | ((suspend_time % interval) * 1024)); | |
670 | scan->suspend_time = cpu_to_le32(scan_suspend_time); | |
e1623446 | 671 | IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n", |
2a421b91 TW |
672 | scan_suspend_time, interval); |
673 | } | |
674 | ||
1ecf9fc1 JB |
675 | if (priv->scan_request->n_ssids) { |
676 | int i, p = 0; | |
677 | IWL_DEBUG_SCAN(priv, "Kicking off active scan\n"); | |
678 | for (i = 0; i < priv->scan_request->n_ssids; i++) { | |
679 | /* always does wildcard anyway */ | |
680 | if (!priv->scan_request->ssids[i].ssid_len) | |
681 | continue; | |
682 | scan->direct_scan[p].id = WLAN_EID_SSID; | |
683 | scan->direct_scan[p].len = | |
684 | priv->scan_request->ssids[i].ssid_len; | |
685 | memcpy(scan->direct_scan[p].ssid, | |
686 | priv->scan_request->ssids[i].ssid, | |
687 | priv->scan_request->ssids[i].ssid_len); | |
688 | n_probes++; | |
689 | p++; | |
690 | } | |
691 | is_active = true; | |
692 | } else | |
693 | IWL_DEBUG_SCAN(priv, "Start passive scan.\n"); | |
2a421b91 TW |
694 | |
695 | scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK; | |
696 | scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id; | |
697 | scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; | |
698 | ||
699 | ||
1b63ba8a | 700 | if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) { |
f53696de | 701 | band = IEEE80211_BAND_2GHZ; |
2a421b91 | 702 | scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; |
a2b0f02e WYG |
703 | chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK) |
704 | >> RXON_FLG_CHANNEL_MODE_POS; | |
705 | if (chan_mod == CHANNEL_MODE_PURE_40) { | |
76eff18b TW |
706 | rate = IWL_RATE_6M_PLCP; |
707 | } else { | |
708 | rate = IWL_RATE_1M_PLCP; | |
709 | rate_flags = RATE_MCS_CCK_MSK; | |
710 | } | |
2a421b91 | 711 | scan->good_CRC_th = 0; |
1b63ba8a | 712 | } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) { |
f53696de | 713 | band = IEEE80211_BAND_5GHZ; |
76eff18b | 714 | rate = IWL_RATE_6M_PLCP; |
b097ad29 JB |
715 | /* |
716 | * If active scaning is requested but a certain channel | |
717 | * is marked passive, we can do active scanning if we | |
718 | * detect transmissions. | |
719 | */ | |
720 | scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH : 0; | |
2a421b91 | 721 | |
f53696de TW |
722 | /* Force use of chains B and C (0x6) for scan Rx for 4965 |
723 | * Avoid A (0x1) because of its off-channel reception on A-band. | |
5118303f | 724 | */ |
f53696de | 725 | if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965) |
fff7a434 | 726 | rx_ant = ANT_BC; |
1b63ba8a | 727 | } else { |
39aadf8c | 728 | IWL_WARN(priv, "Invalid scan band count\n"); |
2a421b91 TW |
729 | goto done; |
730 | } | |
731 | ||
76eff18b TW |
732 | priv->scan_tx_ant[band] = |
733 | iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]); | |
734 | rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]); | |
735 | scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags); | |
736 | ||
f1e3d7d4 SZ |
737 | /* In power save mode use one chain, otherwise use all chains */ |
738 | if (test_bit(STATUS_POWER_PMI, &priv->status)) { | |
739 | /* rx_ant has been set to all valid chains previously */ | |
740 | active_chains = rx_ant & | |
741 | ((u8)(priv->chain_noise_data.active_chains)); | |
742 | if (!active_chains) | |
743 | active_chains = rx_ant; | |
744 | ||
745 | IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n", | |
746 | priv->chain_noise_data.active_chains); | |
747 | ||
748 | rx_ant = first_antenna(active_chains); | |
749 | } | |
5118303f | 750 | /* MIMO is not used here, but value is required */ |
b23aa883 | 751 | rx_chain |= priv->hw_params.valid_rx_ant << RXON_RX_CHAIN_VALID_POS; |
f1e3d7d4 | 752 | rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS; |
fff7a434 WYG |
753 | rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS; |
754 | rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS; | |
755 | scan->rx_chain = cpu_to_le16(rx_chain); | |
1ecf9fc1 JB |
756 | cmd_len = iwl_fill_probe_req(priv, |
757 | (struct ieee80211_mgmt *)scan->data, | |
758 | priv->scan_request->ie, | |
759 | priv->scan_request->ie_len, | |
760 | IWL_MAX_SCAN_SIZE - sizeof(*scan)); | |
2a421b91 TW |
761 | |
762 | scan->tx_cmd.len = cpu_to_le16(cmd_len); | |
2a421b91 | 763 | |
279b05d4 | 764 | if (iwl_is_monitor_mode(priv)) |
2a421b91 TW |
765 | scan->filter_flags = RXON_FILTER_PROMISC_MSK; |
766 | ||
f53696de TW |
767 | scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | |
768 | RXON_FILTER_BCON_AWARE_MSK); | |
769 | ||
fe905f1d | 770 | scan->channel_count = |
1ecf9fc1 | 771 | iwl_get_channels_for_scan(priv, band, is_active, n_probes, |
fe905f1d TW |
772 | (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]); |
773 | ||
f53696de | 774 | if (scan->channel_count == 0) { |
e1623446 | 775 | IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count); |
f53696de TW |
776 | goto done; |
777 | } | |
2a421b91 | 778 | |
2a421b91 TW |
779 | cmd.len += le16_to_cpu(scan->tx_cmd.len) + |
780 | scan->channel_count * sizeof(struct iwl_scan_channel); | |
781 | cmd.data = scan; | |
782 | scan->len = cpu_to_le16(cmd.len); | |
783 | ||
784 | set_bit(STATUS_SCAN_HW, &priv->status); | |
785 | ret = iwl_send_cmd_sync(priv, &cmd); | |
786 | if (ret) | |
787 | goto done; | |
788 | ||
789 | queue_delayed_work(priv->workqueue, &priv->scan_check, | |
790 | IWL_SCAN_CHECK_WATCHDOG); | |
791 | ||
792 | mutex_unlock(&priv->mutex); | |
793 | return; | |
794 | ||
795 | done: | |
951891c7 MA |
796 | /* Cannot perform scan. Make sure we clear scanning |
797 | * bits from status so next scan request can be performed. | |
798 | * If we don't clear scanning status bit here all next scan | |
799 | * will fail | |
800 | */ | |
801 | clear_bit(STATUS_SCAN_HW, &priv->status); | |
802 | clear_bit(STATUS_SCANNING, &priv->status); | |
2a421b91 TW |
803 | /* inform mac80211 scan aborted */ |
804 | queue_work(priv->workqueue, &priv->scan_completed); | |
805 | mutex_unlock(&priv->mutex); | |
806 | } | |
807 | ||
77fecfb8 | 808 | void iwl_bg_abort_scan(struct work_struct *work) |
2a421b91 TW |
809 | { |
810 | struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan); | |
811 | ||
5bddf549 WYG |
812 | if (!test_bit(STATUS_READY, &priv->status) || |
813 | !test_bit(STATUS_GEO_CONFIGURED, &priv->status)) | |
2a421b91 TW |
814 | return; |
815 | ||
816 | mutex_lock(&priv->mutex); | |
817 | ||
818 | set_bit(STATUS_SCAN_ABORTING, &priv->status); | |
819 | iwl_send_scan_abort(priv); | |
820 | ||
821 | mutex_unlock(&priv->mutex); | |
822 | } | |
77fecfb8 | 823 | EXPORT_SYMBOL(iwl_bg_abort_scan); |
2a421b91 | 824 | |
77fecfb8 | 825 | void iwl_bg_scan_completed(struct work_struct *work) |
eedda367 TW |
826 | { |
827 | struct iwl_priv *priv = | |
828 | container_of(work, struct iwl_priv, scan_completed); | |
829 | ||
e1623446 | 830 | IWL_DEBUG_SCAN(priv, "SCAN complete scan\n"); |
eedda367 | 831 | |
fbc9f97b RC |
832 | cancel_delayed_work(&priv->scan_check); |
833 | ||
74aa9be0 JB |
834 | ieee80211_scan_completed(priv->hw, false); |
835 | ||
eedda367 TW |
836 | if (test_bit(STATUS_EXIT_PENDING, &priv->status)) |
837 | return; | |
838 | ||
eedda367 TW |
839 | /* Since setting the TXPOWER may have been deferred while |
840 | * performing the scan, fire one off */ | |
841 | mutex_lock(&priv->mutex); | |
842 | iwl_set_tx_power(priv, priv->tx_power_user_lmt, true); | |
843 | mutex_unlock(&priv->mutex); | |
844 | } | |
77fecfb8 | 845 | EXPORT_SYMBOL(iwl_bg_scan_completed); |
eedda367 | 846 | |
2a421b91 TW |
847 | void iwl_setup_scan_deferred_work(struct iwl_priv *priv) |
848 | { | |
eedda367 | 849 | INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); |
2a421b91 TW |
850 | INIT_WORK(&priv->request_scan, iwl_bg_request_scan); |
851 | INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan); | |
852 | INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check); | |
853 | } | |
854 | EXPORT_SYMBOL(iwl_setup_scan_deferred_work); | |
855 |