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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 JL |
30 | #include <net/lib80211.h> |
31 | #include <net/mac80211.h> | |
2a421b91 TW |
32 | |
33 | #include "iwl-eeprom.h" | |
34 | #include "iwl-dev.h" | |
35 | #include "iwl-core.h" | |
36 | #include "iwl-sta.h" | |
37 | #include "iwl-io.h" | |
38 | #include "iwl-helpers.h" | |
39 | ||
40 | /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after | |
41 | * sending probe req. This should be set long enough to hear probe responses | |
42 | * from more than one AP. */ | |
fe905f1d TW |
43 | #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */ |
44 | #define IWL_ACTIVE_DWELL_TIME_52 (20) | |
45 | ||
46 | #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3) | |
47 | #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2) | |
2a421b91 | 48 | |
2a421b91 TW |
49 | /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel. |
50 | * Must be set longer than active dwell time. | |
51 | * For the most reliable scan, set > AP beacon interval (typically 100msec). */ | |
52 | #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */ | |
53 | #define IWL_PASSIVE_DWELL_TIME_52 (10) | |
54 | #define IWL_PASSIVE_DWELL_BASE (100) | |
55 | #define IWL_CHANNEL_TUNE_TIME 5 | |
56 | ||
fe905f1d TW |
57 | |
58 | ||
2a421b91 TW |
59 | /** |
60 | * iwl_scan_cancel - Cancel any currently executing HW scan | |
61 | * | |
62 | * NOTE: priv->mutex is not required before calling this function | |
63 | */ | |
64 | int iwl_scan_cancel(struct iwl_priv *priv) | |
65 | { | |
66 | if (!test_bit(STATUS_SCAN_HW, &priv->status)) { | |
67 | clear_bit(STATUS_SCANNING, &priv->status); | |
68 | return 0; | |
69 | } | |
70 | ||
71 | if (test_bit(STATUS_SCANNING, &priv->status)) { | |
72 | if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
73 | IWL_DEBUG_SCAN("Queuing scan abort.\n"); | |
74 | set_bit(STATUS_SCAN_ABORTING, &priv->status); | |
75 | queue_work(priv->workqueue, &priv->abort_scan); | |
76 | ||
77 | } else | |
78 | IWL_DEBUG_SCAN("Scan abort already in progress.\n"); | |
79 | ||
80 | return test_bit(STATUS_SCANNING, &priv->status); | |
81 | } | |
82 | ||
83 | return 0; | |
84 | } | |
85 | EXPORT_SYMBOL(iwl_scan_cancel); | |
86 | /** | |
87 | * iwl_scan_cancel_timeout - Cancel any currently executing HW scan | |
88 | * @ms: amount of time to wait (in milliseconds) for scan to abort | |
89 | * | |
90 | * NOTE: priv->mutex must be held before calling this function | |
91 | */ | |
92 | int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms) | |
93 | { | |
94 | unsigned long now = jiffies; | |
95 | int ret; | |
96 | ||
97 | ret = iwl_scan_cancel(priv); | |
98 | if (ret && ms) { | |
99 | mutex_unlock(&priv->mutex); | |
100 | while (!time_after(jiffies, now + msecs_to_jiffies(ms)) && | |
101 | test_bit(STATUS_SCANNING, &priv->status)) | |
102 | msleep(1); | |
103 | mutex_lock(&priv->mutex); | |
104 | ||
105 | return test_bit(STATUS_SCANNING, &priv->status); | |
106 | } | |
107 | ||
108 | return ret; | |
109 | } | |
110 | EXPORT_SYMBOL(iwl_scan_cancel_timeout); | |
111 | ||
112 | static int iwl_send_scan_abort(struct iwl_priv *priv) | |
113 | { | |
114 | int ret = 0; | |
115 | struct iwl_rx_packet *res; | |
116 | struct iwl_host_cmd cmd = { | |
117 | .id = REPLY_SCAN_ABORT_CMD, | |
118 | .meta.flags = CMD_WANT_SKB, | |
119 | }; | |
120 | ||
121 | /* If there isn't a scan actively going on in the hardware | |
122 | * then we are in between scan bands and not actually | |
123 | * actively scanning, so don't send the abort command */ | |
124 | if (!test_bit(STATUS_SCAN_HW, &priv->status)) { | |
125 | clear_bit(STATUS_SCAN_ABORTING, &priv->status); | |
126 | return 0; | |
127 | } | |
128 | ||
129 | ret = iwl_send_cmd_sync(priv, &cmd); | |
130 | if (ret) { | |
131 | clear_bit(STATUS_SCAN_ABORTING, &priv->status); | |
132 | return ret; | |
133 | } | |
134 | ||
135 | res = (struct iwl_rx_packet *)cmd.meta.u.skb->data; | |
136 | if (res->u.status != CAN_ABORT_STATUS) { | |
137 | /* The scan abort will return 1 for success or | |
138 | * 2 for "failure". A failure condition can be | |
139 | * due to simply not being in an active scan which | |
140 | * can occur if we send the scan abort before we | |
141 | * the microcode has notified us that a scan is | |
142 | * completed. */ | |
143 | IWL_DEBUG_INFO("SCAN_ABORT returned %d.\n", res->u.status); | |
144 | clear_bit(STATUS_SCAN_ABORTING, &priv->status); | |
145 | clear_bit(STATUS_SCAN_HW, &priv->status); | |
146 | } | |
147 | ||
14652562 | 148 | priv->alloc_rxb_skb--; |
2a421b91 TW |
149 | dev_kfree_skb_any(cmd.meta.u.skb); |
150 | ||
151 | return ret; | |
152 | } | |
153 | ||
154 | ||
155 | /* Service response to REPLY_SCAN_CMD (0x80) */ | |
156 | static void iwl_rx_reply_scan(struct iwl_priv *priv, | |
157 | struct iwl_rx_mem_buffer *rxb) | |
158 | { | |
159 | #ifdef CONFIG_IWLWIFI_DEBUG | |
160 | struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; | |
161 | struct iwl_scanreq_notification *notif = | |
162 | (struct iwl_scanreq_notification *)pkt->u.raw; | |
163 | ||
164 | IWL_DEBUG_RX("Scan request status = 0x%x\n", notif->status); | |
165 | #endif | |
166 | } | |
167 | ||
168 | /* Service SCAN_START_NOTIFICATION (0x82) */ | |
169 | static void iwl_rx_scan_start_notif(struct iwl_priv *priv, | |
170 | struct iwl_rx_mem_buffer *rxb) | |
171 | { | |
172 | struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; | |
173 | struct iwl_scanstart_notification *notif = | |
174 | (struct iwl_scanstart_notification *)pkt->u.raw; | |
175 | priv->scan_start_tsf = le32_to_cpu(notif->tsf_low); | |
176 | IWL_DEBUG_SCAN("Scan start: " | |
177 | "%d [802.11%s] " | |
178 | "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", | |
179 | notif->channel, | |
180 | notif->band ? "bg" : "a", | |
fe905f1d TW |
181 | le32_to_cpu(notif->tsf_high), |
182 | le32_to_cpu(notif->tsf_low), | |
183 | notif->status, notif->beacon_timer); | |
2a421b91 TW |
184 | } |
185 | ||
186 | /* Service SCAN_RESULTS_NOTIFICATION (0x83) */ | |
187 | static void iwl_rx_scan_results_notif(struct iwl_priv *priv, | |
188 | struct iwl_rx_mem_buffer *rxb) | |
189 | { | |
190 | #ifdef CONFIG_IWLWIFI_DEBUG | |
191 | struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; | |
192 | struct iwl_scanresults_notification *notif = | |
193 | (struct iwl_scanresults_notification *)pkt->u.raw; | |
194 | ||
195 | IWL_DEBUG_SCAN("Scan ch.res: " | |
196 | "%d [802.11%s] " | |
197 | "(TSF: 0x%08X:%08X) - %d " | |
198 | "elapsed=%lu usec (%dms since last)\n", | |
199 | notif->channel, | |
200 | notif->band ? "bg" : "a", | |
201 | le32_to_cpu(notif->tsf_high), | |
202 | le32_to_cpu(notif->tsf_low), | |
203 | le32_to_cpu(notif->statistics[0]), | |
204 | le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf, | |
205 | jiffies_to_msecs(elapsed_jiffies | |
206 | (priv->last_scan_jiffies, jiffies))); | |
207 | #endif | |
208 | ||
209 | priv->last_scan_jiffies = jiffies; | |
210 | priv->next_scan_jiffies = 0; | |
211 | } | |
212 | ||
213 | /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ | |
214 | static void iwl_rx_scan_complete_notif(struct iwl_priv *priv, | |
215 | struct iwl_rx_mem_buffer *rxb) | |
216 | { | |
cb9289cb | 217 | #ifdef CONFIG_IWLWIFI_DEBUG |
2a421b91 TW |
218 | struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; |
219 | struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw; | |
220 | ||
221 | IWL_DEBUG_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n", | |
222 | scan_notif->scanned_channels, | |
223 | scan_notif->tsf_low, | |
224 | scan_notif->tsf_high, scan_notif->status); | |
cb9289cb | 225 | #endif |
2a421b91 TW |
226 | |
227 | /* The HW is no longer scanning */ | |
228 | clear_bit(STATUS_SCAN_HW, &priv->status); | |
229 | ||
230 | /* The scan completion notification came in, so kill that timer... */ | |
231 | cancel_delayed_work(&priv->scan_check); | |
232 | ||
233 | IWL_DEBUG_INFO("Scan pass on %sGHz took %dms\n", | |
1b63ba8a DM |
234 | (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ? |
235 | "2.4" : "5.2", | |
2a421b91 TW |
236 | jiffies_to_msecs(elapsed_jiffies |
237 | (priv->scan_pass_start, jiffies))); | |
238 | ||
1b63ba8a DM |
239 | /* Remove this scanned band from the list of pending |
240 | * bands to scan, band G precedes A in order of scanning | |
241 | * as seen in iwl_bg_request_scan */ | |
242 | if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) | |
243 | priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ); | |
244 | else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) | |
245 | priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ); | |
2a421b91 TW |
246 | |
247 | /* If a request to abort was given, or the scan did not succeed | |
248 | * then we reset the scan state machine and terminate, | |
249 | * re-queuing another scan if one has been requested */ | |
250 | if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
251 | IWL_DEBUG_INFO("Aborted scan completed.\n"); | |
252 | clear_bit(STATUS_SCAN_ABORTING, &priv->status); | |
253 | } else { | |
254 | /* If there are more bands on this scan pass reschedule */ | |
1b63ba8a | 255 | if (priv->scan_bands) |
2a421b91 TW |
256 | goto reschedule; |
257 | } | |
258 | ||
259 | priv->last_scan_jiffies = jiffies; | |
260 | priv->next_scan_jiffies = 0; | |
261 | IWL_DEBUG_INFO("Setting scan to off\n"); | |
262 | ||
263 | clear_bit(STATUS_SCANNING, &priv->status); | |
264 | ||
265 | IWL_DEBUG_INFO("Scan took %dms\n", | |
266 | jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies))); | |
267 | ||
268 | queue_work(priv->workqueue, &priv->scan_completed); | |
269 | ||
270 | return; | |
271 | ||
272 | reschedule: | |
273 | priv->scan_pass_start = jiffies; | |
274 | queue_work(priv->workqueue, &priv->request_scan); | |
275 | } | |
276 | ||
277 | void iwl_setup_rx_scan_handlers(struct iwl_priv *priv) | |
278 | { | |
279 | /* scan handlers */ | |
280 | priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan; | |
281 | priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif; | |
282 | priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] = | |
283 | iwl_rx_scan_results_notif; | |
284 | priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] = | |
285 | iwl_rx_scan_complete_notif; | |
286 | } | |
287 | EXPORT_SYMBOL(iwl_setup_rx_scan_handlers); | |
288 | ||
77fecfb8 SO |
289 | inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv, |
290 | enum ieee80211_band band, | |
291 | u8 n_probes) | |
2a421b91 TW |
292 | { |
293 | if (band == IEEE80211_BAND_5GHZ) | |
fe905f1d TW |
294 | return IWL_ACTIVE_DWELL_TIME_52 + |
295 | IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1); | |
2a421b91 | 296 | else |
fe905f1d TW |
297 | return IWL_ACTIVE_DWELL_TIME_24 + |
298 | IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1); | |
2a421b91 | 299 | } |
77fecfb8 | 300 | EXPORT_SYMBOL(iwl_get_active_dwell_time); |
2a421b91 | 301 | |
77fecfb8 SO |
302 | u16 iwl_get_passive_dwell_time(struct iwl_priv *priv, |
303 | enum ieee80211_band band) | |
2a421b91 | 304 | { |
fe905f1d | 305 | u16 passive = (band == IEEE80211_BAND_2GHZ) ? |
2a421b91 TW |
306 | IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 : |
307 | IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52; | |
308 | ||
309 | if (iwl_is_associated(priv)) { | |
310 | /* If we're associated, we clamp the maximum passive | |
311 | * dwell time to be 98% of the beacon interval (minus | |
312 | * 2 * channel tune time) */ | |
313 | passive = priv->beacon_int; | |
314 | if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive) | |
315 | passive = IWL_PASSIVE_DWELL_BASE; | |
316 | passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; | |
317 | } | |
318 | ||
2a421b91 TW |
319 | return passive; |
320 | } | |
77fecfb8 | 321 | EXPORT_SYMBOL(iwl_get_passive_dwell_time); |
2a421b91 TW |
322 | |
323 | static int iwl_get_channels_for_scan(struct iwl_priv *priv, | |
324 | enum ieee80211_band band, | |
fe905f1d | 325 | u8 is_active, u8 n_probes, |
2a421b91 TW |
326 | struct iwl_scan_channel *scan_ch) |
327 | { | |
328 | const struct ieee80211_channel *channels = NULL; | |
329 | const struct ieee80211_supported_band *sband; | |
330 | const struct iwl_channel_info *ch_info; | |
331 | u16 passive_dwell = 0; | |
332 | u16 active_dwell = 0; | |
333 | int added, i; | |
d16dc48a | 334 | u16 channel; |
2a421b91 TW |
335 | |
336 | sband = iwl_get_hw_mode(priv, band); | |
337 | if (!sband) | |
338 | return 0; | |
339 | ||
340 | channels = sband->channels; | |
341 | ||
fe905f1d | 342 | active_dwell = iwl_get_active_dwell_time(priv, band, n_probes); |
2a421b91 TW |
343 | passive_dwell = iwl_get_passive_dwell_time(priv, band); |
344 | ||
fe905f1d TW |
345 | if (passive_dwell <= active_dwell) |
346 | passive_dwell = active_dwell + 1; | |
347 | ||
2a421b91 TW |
348 | for (i = 0, added = 0; i < sband->n_channels; i++) { |
349 | if (channels[i].flags & IEEE80211_CHAN_DISABLED) | |
350 | continue; | |
351 | ||
d16dc48a | 352 | channel = |
2a421b91 | 353 | ieee80211_frequency_to_channel(channels[i].center_freq); |
d16dc48a | 354 | scan_ch->channel = cpu_to_le16(channel); |
2a421b91 | 355 | |
d16dc48a | 356 | ch_info = iwl_get_channel_info(priv, band, channel); |
2a421b91 | 357 | if (!is_channel_valid(ch_info)) { |
1b63ba8a | 358 | IWL_DEBUG_SCAN("Channel %d is INVALID for this band.\n", |
d16dc48a | 359 | channel); |
2a421b91 TW |
360 | continue; |
361 | } | |
362 | ||
363 | if (!is_active || is_channel_passive(ch_info) || | |
364 | (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN)) | |
d16dc48a | 365 | scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; |
2a421b91 | 366 | else |
d16dc48a | 367 | scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE; |
2a421b91 | 368 | |
0ffe014a | 369 | if (n_probes) |
fe905f1d | 370 | scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes); |
2a421b91 TW |
371 | |
372 | scan_ch->active_dwell = cpu_to_le16(active_dwell); | |
373 | scan_ch->passive_dwell = cpu_to_le16(passive_dwell); | |
374 | ||
375 | /* Set txpower levels to defaults */ | |
f53696de | 376 | scan_ch->dsp_atten = 110; |
2a421b91 | 377 | |
fe905f1d TW |
378 | /* NOTE: if we were doing 6Mb OFDM for scans we'd use |
379 | * power level: | |
380 | * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; | |
381 | */ | |
2a421b91 | 382 | if (band == IEEE80211_BAND_5GHZ) |
f53696de | 383 | scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; |
fe905f1d | 384 | else |
f53696de | 385 | scan_ch->tx_gain = ((1 << 5) | (5 << 3)); |
2a421b91 | 386 | |
fe905f1d TW |
387 | IWL_DEBUG_SCAN("Scanning ch=%d prob=0x%X [%s %d]\n", |
388 | channel, le32_to_cpu(scan_ch->type), | |
d16dc48a TW |
389 | (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? |
390 | "ACTIVE" : "PASSIVE", | |
391 | (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? | |
2a421b91 TW |
392 | active_dwell : passive_dwell); |
393 | ||
394 | scan_ch++; | |
395 | added++; | |
396 | } | |
397 | ||
398 | IWL_DEBUG_SCAN("total channels to scan %d \n", added); | |
399 | return added; | |
400 | } | |
401 | ||
f53696de TW |
402 | void iwl_init_scan_params(struct iwl_priv *priv) |
403 | { | |
76eff18b | 404 | u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1; |
f53696de | 405 | if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ]) |
76eff18b | 406 | priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx; |
f53696de | 407 | if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ]) |
76eff18b | 408 | priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx; |
f53696de TW |
409 | } |
410 | ||
2a421b91 TW |
411 | int iwl_scan_initiate(struct iwl_priv *priv) |
412 | { | |
2a421b91 TW |
413 | if (!iwl_is_ready_rf(priv)) { |
414 | IWL_DEBUG_SCAN("Aborting scan due to not ready.\n"); | |
415 | return -EIO; | |
416 | } | |
417 | ||
418 | if (test_bit(STATUS_SCANNING, &priv->status)) { | |
419 | IWL_DEBUG_SCAN("Scan already in progress.\n"); | |
420 | return -EAGAIN; | |
421 | } | |
422 | ||
423 | if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
8d09a5e1 | 424 | IWL_DEBUG_SCAN("Scan request while abort pending\n"); |
2a421b91 TW |
425 | return -EAGAIN; |
426 | } | |
427 | ||
428 | IWL_DEBUG_INFO("Starting scan...\n"); | |
1b63ba8a DM |
429 | if (priv->cfg->sku & IWL_SKU_G) |
430 | priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ); | |
431 | if (priv->cfg->sku & IWL_SKU_A) | |
432 | priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ); | |
2a421b91 TW |
433 | set_bit(STATUS_SCANNING, &priv->status); |
434 | priv->scan_start = jiffies; | |
435 | priv->scan_pass_start = priv->scan_start; | |
436 | ||
437 | queue_work(priv->workqueue, &priv->request_scan); | |
438 | ||
439 | return 0; | |
440 | } | |
441 | EXPORT_SYMBOL(iwl_scan_initiate); | |
442 | ||
443 | #define IWL_SCAN_CHECK_WATCHDOG (7 * HZ) | |
444 | ||
77fecfb8 | 445 | void iwl_bg_scan_check(struct work_struct *data) |
2a421b91 TW |
446 | { |
447 | struct iwl_priv *priv = | |
448 | container_of(data, struct iwl_priv, scan_check.work); | |
449 | ||
450 | if (test_bit(STATUS_EXIT_PENDING, &priv->status)) | |
451 | return; | |
452 | ||
453 | mutex_lock(&priv->mutex); | |
454 | if (test_bit(STATUS_SCANNING, &priv->status) || | |
455 | test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
456 | IWL_DEBUG(IWL_DL_SCAN, "Scan completion watchdog resetting " | |
457 | "adapter (%dms)\n", | |
458 | jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG)); | |
459 | ||
460 | if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) | |
461 | iwl_send_scan_abort(priv); | |
462 | } | |
463 | mutex_unlock(&priv->mutex); | |
464 | } | |
77fecfb8 SO |
465 | EXPORT_SYMBOL(iwl_bg_scan_check); |
466 | ||
2a421b91 TW |
467 | /** |
468 | * iwl_supported_rate_to_ie - fill in the supported rate in IE field | |
469 | * | |
470 | * return : set the bit for each supported rate insert in ie | |
471 | */ | |
472 | static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate, | |
473 | u16 basic_rate, int *left) | |
474 | { | |
475 | u16 ret_rates = 0, bit; | |
476 | int i; | |
477 | u8 *cnt = ie; | |
478 | u8 *rates = ie + 1; | |
479 | ||
480 | for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) { | |
481 | if (bit & supported_rate) { | |
482 | ret_rates |= bit; | |
483 | rates[*cnt] = iwl_rates[i].ieee | | |
484 | ((bit & basic_rate) ? 0x80 : 0x00); | |
485 | (*cnt)++; | |
486 | (*left)--; | |
487 | if ((*left <= 0) || | |
488 | (*cnt >= IWL_SUPPORTED_RATES_IE_LEN)) | |
489 | break; | |
490 | } | |
491 | } | |
492 | ||
493 | return ret_rates; | |
494 | } | |
495 | ||
496 | ||
497 | static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband, | |
f53696de | 498 | u8 *pos, int *left) |
2a421b91 TW |
499 | { |
500 | struct ieee80211_ht_cap *ht_cap; | |
501 | ||
d9fe60de | 502 | if (!sband || !sband->ht_cap.ht_supported) |
2a421b91 TW |
503 | return; |
504 | ||
505 | if (*left < sizeof(struct ieee80211_ht_cap)) | |
506 | return; | |
507 | ||
508 | *pos++ = sizeof(struct ieee80211_ht_cap); | |
509 | ht_cap = (struct ieee80211_ht_cap *) pos; | |
510 | ||
d9fe60de JB |
511 | ht_cap->cap_info = cpu_to_le16(sband->ht_cap.cap); |
512 | memcpy(&ht_cap->mcs, &sband->ht_cap.mcs, 16); | |
2a421b91 | 513 | ht_cap->ampdu_params_info = |
d9fe60de JB |
514 | (sband->ht_cap.ampdu_factor & IEEE80211_HT_AMPDU_PARM_FACTOR) | |
515 | ((sband->ht_cap.ampdu_density << 2) & | |
516 | IEEE80211_HT_AMPDU_PARM_DENSITY); | |
2a421b91 TW |
517 | *left -= sizeof(struct ieee80211_ht_cap); |
518 | } | |
519 | ||
520 | /** | |
521 | * iwl_fill_probe_req - fill in all required fields and IE for probe request | |
522 | */ | |
f53696de | 523 | |
77fecfb8 SO |
524 | u16 iwl_fill_probe_req(struct iwl_priv *priv, |
525 | enum ieee80211_band band, | |
526 | struct ieee80211_mgmt *frame, | |
527 | int left) | |
2a421b91 TW |
528 | { |
529 | int len = 0; | |
530 | u8 *pos = NULL; | |
531 | u16 active_rates, ret_rates, cck_rates, active_rate_basic; | |
532 | const struct ieee80211_supported_band *sband = | |
533 | iwl_get_hw_mode(priv, band); | |
534 | ||
f53696de | 535 | |
2a421b91 TW |
536 | /* Make sure there is enough space for the probe request, |
537 | * two mandatory IEs and the data */ | |
538 | left -= 24; | |
539 | if (left < 0) | |
540 | return 0; | |
2a421b91 TW |
541 | |
542 | frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ); | |
543 | memcpy(frame->da, iwl_bcast_addr, ETH_ALEN); | |
544 | memcpy(frame->sa, priv->mac_addr, ETH_ALEN); | |
545 | memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN); | |
546 | frame->seq_ctrl = 0; | |
547 | ||
f53696de TW |
548 | len += 24; |
549 | ||
2a421b91 | 550 | /* ...next IE... */ |
f53696de | 551 | pos = &frame->u.probe_req.variable[0]; |
2a421b91 | 552 | |
f53696de | 553 | /* fill in our indirect SSID IE */ |
2a421b91 TW |
554 | left -= 2; |
555 | if (left < 0) | |
556 | return 0; | |
2a421b91 TW |
557 | *pos++ = WLAN_EID_SSID; |
558 | *pos++ = 0; | |
559 | ||
f53696de | 560 | len += 2; |
2a421b91 TW |
561 | |
562 | /* fill in supported rate */ | |
2a421b91 TW |
563 | left -= 2; |
564 | if (left < 0) | |
565 | return 0; | |
566 | ||
2a421b91 TW |
567 | *pos++ = WLAN_EID_SUPP_RATES; |
568 | *pos = 0; | |
569 | ||
570 | /* exclude 60M rate */ | |
571 | active_rates = priv->rates_mask; | |
572 | active_rates &= ~IWL_RATE_60M_MASK; | |
573 | ||
574 | active_rate_basic = active_rates & IWL_BASIC_RATES_MASK; | |
575 | ||
576 | cck_rates = IWL_CCK_RATES_MASK & active_rates; | |
577 | ret_rates = iwl_supported_rate_to_ie(pos, cck_rates, | |
f53696de | 578 | active_rate_basic, &left); |
2a421b91 TW |
579 | active_rates &= ~ret_rates; |
580 | ||
581 | ret_rates = iwl_supported_rate_to_ie(pos, active_rates, | |
f53696de | 582 | active_rate_basic, &left); |
2a421b91 TW |
583 | active_rates &= ~ret_rates; |
584 | ||
585 | len += 2 + *pos; | |
586 | pos += (*pos) + 1; | |
f53696de | 587 | |
2a421b91 TW |
588 | if (active_rates == 0) |
589 | goto fill_end; | |
590 | ||
591 | /* fill in supported extended rate */ | |
592 | /* ...next IE... */ | |
593 | left -= 2; | |
594 | if (left < 0) | |
595 | return 0; | |
596 | /* ... fill it in... */ | |
597 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
598 | *pos = 0; | |
f53696de TW |
599 | iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left); |
600 | if (*pos > 0) { | |
2a421b91 | 601 | len += 2 + *pos; |
f53696de TW |
602 | pos += (*pos) + 1; |
603 | } else { | |
604 | pos--; | |
605 | } | |
2a421b91 TW |
606 | |
607 | fill_end: | |
f53696de | 608 | |
2a421b91 TW |
609 | left -= 2; |
610 | if (left < 0) | |
611 | return 0; | |
612 | ||
613 | *pos++ = WLAN_EID_HT_CAPABILITY; | |
614 | *pos = 0; | |
2a421b91 | 615 | iwl_ht_cap_to_ie(sband, pos, &left); |
2a421b91 TW |
616 | if (*pos > 0) |
617 | len += 2 + *pos; | |
f53696de | 618 | |
2a421b91 TW |
619 | return (u16)len; |
620 | } | |
77fecfb8 | 621 | EXPORT_SYMBOL(iwl_fill_probe_req); |
2a421b91 TW |
622 | |
623 | static void iwl_bg_request_scan(struct work_struct *data) | |
624 | { | |
625 | struct iwl_priv *priv = | |
626 | container_of(data, struct iwl_priv, request_scan); | |
627 | struct iwl_host_cmd cmd = { | |
628 | .id = REPLY_SCAN_CMD, | |
629 | .len = sizeof(struct iwl_scan_cmd), | |
630 | .meta.flags = CMD_SIZE_HUGE, | |
631 | }; | |
632 | struct iwl_scan_cmd *scan; | |
633 | struct ieee80211_conf *conf = NULL; | |
f53696de | 634 | int ret = 0; |
76eff18b | 635 | u32 rate_flags = 0; |
2a421b91 TW |
636 | u16 cmd_len; |
637 | enum ieee80211_band band; | |
fe905f1d | 638 | u8 n_probes = 2; |
d588be6b | 639 | u8 rx_chain = priv->hw_params.valid_rx_ant; |
76eff18b | 640 | u8 rate; |
9387b7ca | 641 | DECLARE_SSID_BUF(ssid); |
2a421b91 TW |
642 | |
643 | conf = ieee80211_get_hw_conf(priv->hw); | |
644 | ||
645 | mutex_lock(&priv->mutex); | |
646 | ||
647 | if (!iwl_is_ready(priv)) { | |
39aadf8c | 648 | IWL_WARN(priv, "request scan called when driver not ready.\n"); |
2a421b91 TW |
649 | goto done; |
650 | } | |
651 | ||
a96a27f9 | 652 | /* Make sure the scan wasn't canceled before this queued work |
2a421b91 TW |
653 | * was given the chance to run... */ |
654 | if (!test_bit(STATUS_SCANNING, &priv->status)) | |
655 | goto done; | |
656 | ||
657 | /* This should never be called or scheduled if there is currently | |
658 | * a scan active in the hardware. */ | |
659 | if (test_bit(STATUS_SCAN_HW, &priv->status)) { | |
660 | IWL_DEBUG_INFO("Multiple concurrent scan requests in parallel. " | |
661 | "Ignoring second request.\n"); | |
662 | ret = -EIO; | |
663 | goto done; | |
664 | } | |
665 | ||
666 | if (test_bit(STATUS_EXIT_PENDING, &priv->status)) { | |
667 | IWL_DEBUG_SCAN("Aborting scan due to device shutdown\n"); | |
668 | goto done; | |
669 | } | |
670 | ||
671 | if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
672 | IWL_DEBUG_HC("Scan request while abort pending. Queuing.\n"); | |
673 | goto done; | |
674 | } | |
675 | ||
676 | if (iwl_is_rfkill(priv)) { | |
677 | IWL_DEBUG_HC("Aborting scan due to RF Kill activation\n"); | |
678 | goto done; | |
679 | } | |
680 | ||
681 | if (!test_bit(STATUS_READY, &priv->status)) { | |
682 | IWL_DEBUG_HC("Scan request while uninitialized. Queuing.\n"); | |
683 | goto done; | |
684 | } | |
685 | ||
686 | if (!priv->scan_bands) { | |
687 | IWL_DEBUG_HC("Aborting scan due to no requested bands\n"); | |
688 | goto done; | |
689 | } | |
690 | ||
691 | if (!priv->scan) { | |
692 | priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) + | |
693 | IWL_MAX_SCAN_SIZE, GFP_KERNEL); | |
694 | if (!priv->scan) { | |
695 | ret = -ENOMEM; | |
696 | goto done; | |
697 | } | |
698 | } | |
699 | scan = priv->scan; | |
700 | memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE); | |
701 | ||
702 | scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; | |
703 | scan->quiet_time = IWL_ACTIVE_QUIET_TIME; | |
704 | ||
705 | if (iwl_is_associated(priv)) { | |
706 | u16 interval = 0; | |
707 | u32 extra; | |
708 | u32 suspend_time = 100; | |
709 | u32 scan_suspend_time = 100; | |
710 | unsigned long flags; | |
711 | ||
712 | IWL_DEBUG_INFO("Scanning while associated...\n"); | |
713 | ||
714 | spin_lock_irqsave(&priv->lock, flags); | |
715 | interval = priv->beacon_int; | |
716 | spin_unlock_irqrestore(&priv->lock, flags); | |
717 | ||
718 | scan->suspend_time = 0; | |
719 | scan->max_out_time = cpu_to_le32(200 * 1024); | |
720 | if (!interval) | |
721 | interval = suspend_time; | |
722 | ||
723 | extra = (suspend_time / interval) << 22; | |
724 | scan_suspend_time = (extra | | |
725 | ((suspend_time % interval) * 1024)); | |
726 | scan->suspend_time = cpu_to_le32(scan_suspend_time); | |
727 | IWL_DEBUG_SCAN("suspend_time 0x%X beacon interval %d\n", | |
728 | scan_suspend_time, interval); | |
729 | } | |
730 | ||
731 | /* We should add the ability for user to lock to PASSIVE ONLY */ | |
732 | if (priv->one_direct_scan) { | |
f53696de | 733 | IWL_DEBUG_SCAN("Start direct scan for '%s'\n", |
9387b7ca JL |
734 | print_ssid(ssid, priv->direct_ssid, |
735 | priv->direct_ssid_len)); | |
2a421b91 TW |
736 | scan->direct_scan[0].id = WLAN_EID_SSID; |
737 | scan->direct_scan[0].len = priv->direct_ssid_len; | |
738 | memcpy(scan->direct_scan[0].ssid, | |
739 | priv->direct_ssid, priv->direct_ssid_len); | |
fe905f1d | 740 | n_probes++; |
2a421b91 | 741 | } else { |
f53696de | 742 | IWL_DEBUG_SCAN("Start indirect scan.\n"); |
2a421b91 TW |
743 | } |
744 | ||
745 | scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK; | |
746 | scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id; | |
747 | scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; | |
748 | ||
749 | ||
1b63ba8a | 750 | if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) { |
f53696de | 751 | band = IEEE80211_BAND_2GHZ; |
2a421b91 | 752 | scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; |
76eff18b TW |
753 | if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK) { |
754 | rate = IWL_RATE_6M_PLCP; | |
755 | } else { | |
756 | rate = IWL_RATE_1M_PLCP; | |
757 | rate_flags = RATE_MCS_CCK_MSK; | |
758 | } | |
2a421b91 | 759 | scan->good_CRC_th = 0; |
1b63ba8a | 760 | } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) { |
f53696de | 761 | band = IEEE80211_BAND_5GHZ; |
76eff18b | 762 | rate = IWL_RATE_6M_PLCP; |
2a421b91 | 763 | scan->good_CRC_th = IWL_GOOD_CRC_TH; |
2a421b91 | 764 | |
f53696de TW |
765 | /* Force use of chains B and C (0x6) for scan Rx for 4965 |
766 | * Avoid A (0x1) because of its off-channel reception on A-band. | |
5118303f | 767 | */ |
f53696de TW |
768 | if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965) |
769 | rx_chain = 0x6; | |
1b63ba8a | 770 | } else { |
39aadf8c | 771 | IWL_WARN(priv, "Invalid scan band count\n"); |
2a421b91 TW |
772 | goto done; |
773 | } | |
774 | ||
76eff18b TW |
775 | priv->scan_tx_ant[band] = |
776 | iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]); | |
777 | rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]); | |
778 | scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags); | |
779 | ||
5118303f | 780 | /* MIMO is not used here, but value is required */ |
f53696de TW |
781 | scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK | |
782 | cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) | | |
783 | (rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) | | |
784 | (0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS)); | |
785 | ||
2a421b91 | 786 | cmd_len = iwl_fill_probe_req(priv, band, |
f53696de TW |
787 | (struct ieee80211_mgmt *)scan->data, |
788 | IWL_MAX_SCAN_SIZE - sizeof(*scan)); | |
2a421b91 TW |
789 | |
790 | scan->tx_cmd.len = cpu_to_le16(cmd_len); | |
2a421b91 | 791 | |
05c914fe | 792 | if (priv->iw_mode == NL80211_IFTYPE_MONITOR) |
2a421b91 TW |
793 | scan->filter_flags = RXON_FILTER_PROMISC_MSK; |
794 | ||
f53696de TW |
795 | scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | |
796 | RXON_FILTER_BCON_AWARE_MSK); | |
797 | ||
fe905f1d TW |
798 | scan->channel_count = |
799 | iwl_get_channels_for_scan(priv, band, 1, /* active */ | |
800 | n_probes, | |
801 | (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]); | |
802 | ||
f53696de TW |
803 | if (scan->channel_count == 0) { |
804 | IWL_DEBUG_SCAN("channel count %d\n", scan->channel_count); | |
805 | goto done; | |
806 | } | |
2a421b91 | 807 | |
2a421b91 TW |
808 | cmd.len += le16_to_cpu(scan->tx_cmd.len) + |
809 | scan->channel_count * sizeof(struct iwl_scan_channel); | |
810 | cmd.data = scan; | |
811 | scan->len = cpu_to_le16(cmd.len); | |
812 | ||
813 | set_bit(STATUS_SCAN_HW, &priv->status); | |
814 | ret = iwl_send_cmd_sync(priv, &cmd); | |
815 | if (ret) | |
816 | goto done; | |
817 | ||
818 | queue_delayed_work(priv->workqueue, &priv->scan_check, | |
819 | IWL_SCAN_CHECK_WATCHDOG); | |
820 | ||
821 | mutex_unlock(&priv->mutex); | |
822 | return; | |
823 | ||
824 | done: | |
951891c7 MA |
825 | /* Cannot perform scan. Make sure we clear scanning |
826 | * bits from status so next scan request can be performed. | |
827 | * If we don't clear scanning status bit here all next scan | |
828 | * will fail | |
829 | */ | |
830 | clear_bit(STATUS_SCAN_HW, &priv->status); | |
831 | clear_bit(STATUS_SCANNING, &priv->status); | |
2a421b91 TW |
832 | /* inform mac80211 scan aborted */ |
833 | queue_work(priv->workqueue, &priv->scan_completed); | |
834 | mutex_unlock(&priv->mutex); | |
835 | } | |
836 | ||
77fecfb8 | 837 | void iwl_bg_abort_scan(struct work_struct *work) |
2a421b91 TW |
838 | { |
839 | struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan); | |
840 | ||
841 | if (!iwl_is_ready(priv)) | |
842 | return; | |
843 | ||
844 | mutex_lock(&priv->mutex); | |
845 | ||
846 | set_bit(STATUS_SCAN_ABORTING, &priv->status); | |
847 | iwl_send_scan_abort(priv); | |
848 | ||
849 | mutex_unlock(&priv->mutex); | |
850 | } | |
77fecfb8 | 851 | EXPORT_SYMBOL(iwl_bg_abort_scan); |
2a421b91 | 852 | |
77fecfb8 | 853 | void iwl_bg_scan_completed(struct work_struct *work) |
eedda367 TW |
854 | { |
855 | struct iwl_priv *priv = | |
856 | container_of(work, struct iwl_priv, scan_completed); | |
857 | ||
858 | IWL_DEBUG_SCAN("SCAN complete scan\n"); | |
859 | ||
860 | if (test_bit(STATUS_EXIT_PENDING, &priv->status)) | |
861 | return; | |
862 | ||
863 | ieee80211_scan_completed(priv->hw); | |
864 | ||
865 | /* Since setting the TXPOWER may have been deferred while | |
866 | * performing the scan, fire one off */ | |
867 | mutex_lock(&priv->mutex); | |
868 | iwl_set_tx_power(priv, priv->tx_power_user_lmt, true); | |
869 | mutex_unlock(&priv->mutex); | |
870 | } | |
77fecfb8 | 871 | EXPORT_SYMBOL(iwl_bg_scan_completed); |
eedda367 | 872 | |
2a421b91 TW |
873 | void iwl_setup_scan_deferred_work(struct iwl_priv *priv) |
874 | { | |
eedda367 | 875 | INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); |
2a421b91 TW |
876 | INIT_WORK(&priv->request_scan, iwl_bg_request_scan); |
877 | INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan); | |
878 | INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check); | |
879 | } | |
880 | EXPORT_SYMBOL(iwl_setup_scan_deferred_work); | |
881 |