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a910e4a9 SP |
1 | /* |
2 | * Scan implementation for ST-Ericsson CW1200 mac80211 drivers | |
3 | * | |
4 | * Copyright (c) 2010, ST-Ericsson | |
5 | * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/sched.h> | |
13 | #include "cw1200.h" | |
14 | #include "scan.h" | |
15 | #include "sta.h" | |
16 | #include "pm.h" | |
17 | ||
18 | static void cw1200_scan_restart_delayed(struct cw1200_common *priv); | |
19 | ||
20 | static int cw1200_scan_start(struct cw1200_common *priv, struct wsm_scan *scan) | |
21 | { | |
22 | int ret, i; | |
23 | int tmo = 2000; | |
24 | ||
25 | switch (priv->join_status) { | |
26 | case CW1200_JOIN_STATUS_PRE_STA: | |
27 | case CW1200_JOIN_STATUS_JOINING: | |
28 | return -EBUSY; | |
29 | default: | |
30 | break; | |
31 | } | |
32 | ||
33 | wiphy_dbg(priv->hw->wiphy, "[SCAN] hw req, type %d, %d channels, flags: 0x%x.\n", | |
34 | scan->type, scan->num_channels, scan->flags); | |
35 | ||
36 | for (i = 0; i < scan->num_channels; ++i) | |
37 | tmo += scan->ch[i].max_chan_time + 10; | |
38 | ||
39 | cancel_delayed_work_sync(&priv->clear_recent_scan_work); | |
40 | atomic_set(&priv->scan.in_progress, 1); | |
41 | atomic_set(&priv->recent_scan, 1); | |
42 | cw1200_pm_stay_awake(&priv->pm_state, tmo * HZ / 1000); | |
43 | queue_delayed_work(priv->workqueue, &priv->scan.timeout, | |
44 | tmo * HZ / 1000); | |
45 | ret = wsm_scan(priv, scan); | |
46 | if (ret) { | |
47 | atomic_set(&priv->scan.in_progress, 0); | |
48 | cancel_delayed_work_sync(&priv->scan.timeout); | |
49 | cw1200_scan_restart_delayed(priv); | |
50 | } | |
51 | return ret; | |
52 | } | |
53 | ||
54 | int cw1200_hw_scan(struct ieee80211_hw *hw, | |
55 | struct ieee80211_vif *vif, | |
56 | struct cfg80211_scan_request *req) | |
57 | { | |
58 | struct cw1200_common *priv = hw->priv; | |
59 | struct wsm_template_frame frame = { | |
60 | .frame_type = WSM_FRAME_TYPE_PROBE_REQUEST, | |
61 | }; | |
62 | int i, ret; | |
63 | ||
64 | if (!priv->vif) | |
65 | return -EINVAL; | |
66 | ||
67 | /* Scan when P2P_GO corrupt firmware MiniAP mode */ | |
68 | if (priv->join_status == CW1200_JOIN_STATUS_AP) | |
69 | return -EOPNOTSUPP; | |
70 | ||
71 | if (req->n_ssids == 1 && !req->ssids[0].ssid_len) | |
72 | req->n_ssids = 0; | |
73 | ||
74 | wiphy_dbg(hw->wiphy, "[SCAN] Scan request for %d SSIDs.\n", | |
75 | req->n_ssids); | |
76 | ||
77 | if (req->n_ssids > WSM_SCAN_MAX_NUM_OF_SSIDS) | |
78 | return -EINVAL; | |
79 | ||
80 | frame.skb = ieee80211_probereq_get(hw, priv->vif, NULL, 0, | |
81 | req->ie_len); | |
82 | if (!frame.skb) | |
83 | return -ENOMEM; | |
84 | ||
85 | if (req->ie_len) | |
86 | memcpy(skb_put(frame.skb, req->ie_len), req->ie, req->ie_len); | |
87 | ||
88 | /* will be unlocked in cw1200_scan_work() */ | |
89 | down(&priv->scan.lock); | |
90 | mutex_lock(&priv->conf_mutex); | |
91 | ||
92 | ret = wsm_set_template_frame(priv, &frame); | |
93 | if (!ret) { | |
94 | /* Host want to be the probe responder. */ | |
95 | ret = wsm_set_probe_responder(priv, true); | |
96 | } | |
97 | if (ret) { | |
98 | mutex_unlock(&priv->conf_mutex); | |
99 | up(&priv->scan.lock); | |
100 | dev_kfree_skb(frame.skb); | |
101 | return ret; | |
102 | } | |
103 | ||
104 | wsm_lock_tx(priv); | |
105 | ||
106 | BUG_ON(priv->scan.req); | |
107 | priv->scan.req = req; | |
108 | priv->scan.n_ssids = 0; | |
109 | priv->scan.status = 0; | |
110 | priv->scan.begin = &req->channels[0]; | |
111 | priv->scan.curr = priv->scan.begin; | |
112 | priv->scan.end = &req->channels[req->n_channels]; | |
113 | priv->scan.output_power = priv->output_power; | |
114 | ||
115 | for (i = 0; i < req->n_ssids; ++i) { | |
116 | struct wsm_ssid *dst = &priv->scan.ssids[priv->scan.n_ssids]; | |
117 | memcpy(&dst->ssid[0], req->ssids[i].ssid, sizeof(dst->ssid)); | |
118 | dst->length = req->ssids[i].ssid_len; | |
119 | ++priv->scan.n_ssids; | |
120 | } | |
121 | ||
122 | mutex_unlock(&priv->conf_mutex); | |
123 | ||
124 | if (frame.skb) | |
125 | dev_kfree_skb(frame.skb); | |
126 | queue_work(priv->workqueue, &priv->scan.work); | |
127 | return 0; | |
128 | } | |
129 | ||
130 | void cw1200_scan_work(struct work_struct *work) | |
131 | { | |
132 | struct cw1200_common *priv = container_of(work, struct cw1200_common, | |
133 | scan.work); | |
134 | struct ieee80211_channel **it; | |
135 | struct wsm_scan scan = { | |
136 | .type = WSM_SCAN_TYPE_FOREGROUND, | |
137 | .flags = WSM_SCAN_FLAG_SPLIT_METHOD, | |
138 | }; | |
139 | bool first_run = (priv->scan.begin == priv->scan.curr && | |
140 | priv->scan.begin != priv->scan.end); | |
141 | int i; | |
142 | ||
143 | if (first_run) { | |
144 | /* Firmware gets crazy if scan request is sent | |
145 | * when STA is joined but not yet associated. | |
146 | * Force unjoin in this case. | |
147 | */ | |
148 | if (cancel_delayed_work_sync(&priv->join_timeout) > 0) | |
149 | cw1200_join_timeout(&priv->join_timeout.work); | |
150 | } | |
151 | ||
152 | mutex_lock(&priv->conf_mutex); | |
153 | ||
154 | if (first_run) { | |
155 | if (priv->join_status == CW1200_JOIN_STATUS_STA && | |
156 | !(priv->powersave_mode.mode & WSM_PSM_PS)) { | |
157 | struct wsm_set_pm pm = priv->powersave_mode; | |
158 | pm.mode = WSM_PSM_PS; | |
159 | cw1200_set_pm(priv, &pm); | |
160 | } else if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) { | |
161 | /* FW bug: driver has to restart p2p-dev mode | |
162 | * after scan | |
163 | */ | |
164 | cw1200_disable_listening(priv); | |
165 | } | |
166 | } | |
167 | ||
168 | if (!priv->scan.req || (priv->scan.curr == priv->scan.end)) { | |
169 | if (priv->scan.output_power != priv->output_power) | |
170 | wsm_set_output_power(priv, priv->output_power * 10); | |
171 | if (priv->join_status == CW1200_JOIN_STATUS_STA && | |
172 | !(priv->powersave_mode.mode & WSM_PSM_PS)) | |
173 | cw1200_set_pm(priv, &priv->powersave_mode); | |
174 | ||
175 | if (priv->scan.status < 0) | |
176 | wiphy_dbg(priv->hw->wiphy, "[SCAN] Scan failed (%d).\n", | |
177 | priv->scan.status); | |
178 | else if (priv->scan.req) | |
179 | wiphy_dbg(priv->hw->wiphy, | |
180 | "[SCAN] Scan completed.\n"); | |
181 | else | |
182 | wiphy_dbg(priv->hw->wiphy, | |
183 | "[SCAN] Scan canceled.\n"); | |
184 | ||
185 | priv->scan.req = NULL; | |
186 | cw1200_scan_restart_delayed(priv); | |
187 | wsm_unlock_tx(priv); | |
188 | mutex_unlock(&priv->conf_mutex); | |
189 | ieee80211_scan_completed(priv->hw, priv->scan.status ? 1 : 0); | |
190 | up(&priv->scan.lock); | |
191 | return; | |
192 | } else { | |
193 | struct ieee80211_channel *first = *priv->scan.curr; | |
194 | for (it = priv->scan.curr + 1, i = 1; | |
195 | it != priv->scan.end && i < WSM_SCAN_MAX_NUM_OF_CHANNELS; | |
196 | ++it, ++i) { | |
197 | if ((*it)->band != first->band) | |
198 | break; | |
199 | if (((*it)->flags ^ first->flags) & | |
200 | IEEE80211_CHAN_PASSIVE_SCAN) | |
201 | break; | |
202 | if (!(first->flags & IEEE80211_CHAN_PASSIVE_SCAN) && | |
203 | (*it)->max_power != first->max_power) | |
204 | break; | |
205 | } | |
206 | scan.band = first->band; | |
207 | ||
208 | if (priv->scan.req->no_cck) | |
209 | scan.max_tx_rate = WSM_TRANSMIT_RATE_6; | |
210 | else | |
211 | scan.max_tx_rate = WSM_TRANSMIT_RATE_1; | |
212 | scan.num_probes = | |
213 | (first->flags & IEEE80211_CHAN_PASSIVE_SCAN) ? 0 : 2; | |
214 | scan.num_ssids = priv->scan.n_ssids; | |
215 | scan.ssids = &priv->scan.ssids[0]; | |
216 | scan.num_channels = it - priv->scan.curr; | |
217 | /* TODO: Is it optimal? */ | |
218 | scan.probe_delay = 100; | |
219 | /* It is not stated in WSM specification, however | |
220 | * FW team says that driver may not use FG scan | |
221 | * when joined. | |
222 | */ | |
223 | if (priv->join_status == CW1200_JOIN_STATUS_STA) { | |
224 | scan.type = WSM_SCAN_TYPE_BACKGROUND; | |
225 | scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND; | |
226 | } | |
227 | scan.ch = kzalloc( | |
228 | sizeof(struct wsm_scan_ch) * (it - priv->scan.curr), | |
229 | GFP_KERNEL); | |
230 | if (!scan.ch) { | |
231 | priv->scan.status = -ENOMEM; | |
232 | goto fail; | |
233 | } | |
234 | for (i = 0; i < scan.num_channels; ++i) { | |
235 | scan.ch[i].number = priv->scan.curr[i]->hw_value; | |
236 | if (priv->scan.curr[i]->flags & IEEE80211_CHAN_PASSIVE_SCAN) { | |
237 | scan.ch[i].min_chan_time = 50; | |
238 | scan.ch[i].max_chan_time = 100; | |
239 | } else { | |
240 | scan.ch[i].min_chan_time = 10; | |
241 | scan.ch[i].max_chan_time = 25; | |
242 | } | |
243 | } | |
244 | if (!(first->flags & IEEE80211_CHAN_PASSIVE_SCAN) && | |
245 | priv->scan.output_power != first->max_power) { | |
246 | priv->scan.output_power = first->max_power; | |
247 | wsm_set_output_power(priv, | |
248 | priv->scan.output_power * 10); | |
249 | } | |
250 | priv->scan.status = cw1200_scan_start(priv, &scan); | |
251 | kfree(scan.ch); | |
252 | if (priv->scan.status) | |
253 | goto fail; | |
254 | priv->scan.curr = it; | |
255 | } | |
256 | mutex_unlock(&priv->conf_mutex); | |
257 | return; | |
258 | ||
259 | fail: | |
260 | priv->scan.curr = priv->scan.end; | |
261 | mutex_unlock(&priv->conf_mutex); | |
262 | queue_work(priv->workqueue, &priv->scan.work); | |
263 | return; | |
264 | } | |
265 | ||
266 | static void cw1200_scan_restart_delayed(struct cw1200_common *priv) | |
267 | { | |
268 | /* FW bug: driver has to restart p2p-dev mode after scan. */ | |
269 | if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) { | |
270 | cw1200_enable_listening(priv); | |
271 | cw1200_update_filtering(priv); | |
272 | } | |
273 | ||
274 | if (priv->delayed_unjoin) { | |
275 | priv->delayed_unjoin = false; | |
276 | if (queue_work(priv->workqueue, &priv->unjoin_work) <= 0) | |
277 | wsm_unlock_tx(priv); | |
278 | } else if (priv->delayed_link_loss) { | |
279 | wiphy_dbg(priv->hw->wiphy, "[CQM] Requeue BSS loss.\n"); | |
280 | priv->delayed_link_loss = 0; | |
281 | cw1200_cqm_bssloss_sm(priv, 1, 0, 0); | |
282 | } | |
283 | } | |
284 | ||
285 | static void cw1200_scan_complete(struct cw1200_common *priv) | |
286 | { | |
287 | queue_delayed_work(priv->workqueue, &priv->clear_recent_scan_work, HZ); | |
288 | if (priv->scan.direct_probe) { | |
289 | wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe complete.\n"); | |
290 | cw1200_scan_restart_delayed(priv); | |
291 | priv->scan.direct_probe = 0; | |
292 | up(&priv->scan.lock); | |
293 | wsm_unlock_tx(priv); | |
294 | } else { | |
295 | cw1200_scan_work(&priv->scan.work); | |
296 | } | |
297 | } | |
298 | ||
299 | void cw1200_scan_failed_cb(struct cw1200_common *priv) | |
300 | { | |
301 | if (priv->mode == NL80211_IFTYPE_UNSPECIFIED) | |
302 | /* STA is stopped. */ | |
303 | return; | |
304 | ||
305 | if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) { | |
306 | priv->scan.status = -EIO; | |
307 | queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0); | |
308 | } | |
309 | } | |
310 | ||
311 | ||
312 | void cw1200_scan_complete_cb(struct cw1200_common *priv, | |
313 | struct wsm_scan_complete *arg) | |
314 | { | |
315 | if (priv->mode == NL80211_IFTYPE_UNSPECIFIED) | |
316 | /* STA is stopped. */ | |
317 | return; | |
318 | ||
319 | if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) { | |
320 | priv->scan.status = 1; | |
321 | queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0); | |
322 | } | |
323 | } | |
324 | ||
325 | void cw1200_clear_recent_scan_work(struct work_struct *work) | |
326 | { | |
327 | struct cw1200_common *priv = | |
328 | container_of(work, struct cw1200_common, | |
329 | clear_recent_scan_work.work); | |
330 | atomic_xchg(&priv->recent_scan, 0); | |
331 | } | |
332 | ||
333 | void cw1200_scan_timeout(struct work_struct *work) | |
334 | { | |
335 | struct cw1200_common *priv = | |
336 | container_of(work, struct cw1200_common, scan.timeout.work); | |
337 | if (atomic_xchg(&priv->scan.in_progress, 0)) { | |
338 | if (priv->scan.status > 0) { | |
339 | priv->scan.status = 0; | |
340 | } else if (!priv->scan.status) { | |
341 | wiphy_warn(priv->hw->wiphy, | |
342 | "Timeout waiting for scan complete notification.\n"); | |
343 | priv->scan.status = -ETIMEDOUT; | |
344 | priv->scan.curr = priv->scan.end; | |
345 | wsm_stop_scan(priv); | |
346 | } | |
347 | cw1200_scan_complete(priv); | |
348 | } | |
349 | } | |
350 | ||
351 | void cw1200_probe_work(struct work_struct *work) | |
352 | { | |
353 | struct cw1200_common *priv = | |
354 | container_of(work, struct cw1200_common, scan.probe_work.work); | |
355 | u8 queue_id = cw1200_queue_get_queue_id(priv->pending_frame_id); | |
356 | struct cw1200_queue *queue = &priv->tx_queue[queue_id]; | |
357 | const struct cw1200_txpriv *txpriv; | |
358 | struct wsm_tx *wsm; | |
359 | struct wsm_template_frame frame = { | |
360 | .frame_type = WSM_FRAME_TYPE_PROBE_REQUEST, | |
361 | }; | |
362 | struct wsm_ssid ssids[1] = {{ | |
363 | .length = 0, | |
364 | } }; | |
365 | struct wsm_scan_ch ch[1] = {{ | |
366 | .min_chan_time = 0, | |
367 | .max_chan_time = 10, | |
368 | } }; | |
369 | struct wsm_scan scan = { | |
370 | .type = WSM_SCAN_TYPE_FOREGROUND, | |
371 | .num_probes = 1, | |
372 | .probe_delay = 0, | |
373 | .num_channels = 1, | |
374 | .ssids = ssids, | |
375 | .ch = ch, | |
376 | }; | |
377 | u8 *ies; | |
378 | size_t ies_len; | |
379 | int ret; | |
380 | ||
381 | wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe work.\n"); | |
382 | ||
383 | mutex_lock(&priv->conf_mutex); | |
384 | if (down_trylock(&priv->scan.lock)) { | |
385 | /* Scan is already in progress. Requeue self. */ | |
386 | schedule(); | |
387 | queue_delayed_work(priv->workqueue, | |
388 | &priv->scan.probe_work, HZ / 10); | |
389 | mutex_unlock(&priv->conf_mutex); | |
390 | return; | |
391 | } | |
392 | ||
393 | /* Make sure we still have a pending probe req */ | |
394 | if (cw1200_queue_get_skb(queue, priv->pending_frame_id, | |
395 | &frame.skb, &txpriv)) { | |
396 | up(&priv->scan.lock); | |
397 | mutex_unlock(&priv->conf_mutex); | |
398 | wsm_unlock_tx(priv); | |
399 | return; | |
400 | } | |
401 | wsm = (struct wsm_tx *)frame.skb->data; | |
402 | scan.max_tx_rate = wsm->max_tx_rate; | |
403 | scan.band = (priv->channel->band == IEEE80211_BAND_5GHZ) ? | |
404 | WSM_PHY_BAND_5G : WSM_PHY_BAND_2_4G; | |
405 | if (priv->join_status == CW1200_JOIN_STATUS_STA || | |
406 | priv->join_status == CW1200_JOIN_STATUS_IBSS) { | |
407 | scan.type = WSM_SCAN_TYPE_BACKGROUND; | |
408 | scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND; | |
409 | } | |
410 | ch[0].number = priv->channel->hw_value; | |
411 | ||
412 | skb_pull(frame.skb, txpriv->offset); | |
413 | ||
414 | ies = &frame.skb->data[sizeof(struct ieee80211_hdr_3addr)]; | |
415 | ies_len = frame.skb->len - sizeof(struct ieee80211_hdr_3addr); | |
416 | ||
417 | if (ies_len) { | |
418 | u8 *ssidie = | |
419 | (u8 *)cfg80211_find_ie(WLAN_EID_SSID, ies, ies_len); | |
420 | if (ssidie && ssidie[1] && ssidie[1] <= sizeof(ssids[0].ssid)) { | |
421 | u8 *nextie = &ssidie[2 + ssidie[1]]; | |
422 | /* Remove SSID from the IE list. It has to be provided | |
423 | * as a separate argument in cw1200_scan_start call | |
424 | */ | |
425 | ||
426 | /* Store SSID localy */ | |
427 | ssids[0].length = ssidie[1]; | |
428 | memcpy(ssids[0].ssid, &ssidie[2], ssids[0].length); | |
429 | scan.num_ssids = 1; | |
430 | ||
431 | /* Remove SSID from IE list */ | |
432 | ssidie[1] = 0; | |
433 | memmove(&ssidie[2], nextie, &ies[ies_len] - nextie); | |
434 | skb_trim(frame.skb, frame.skb->len - ssids[0].length); | |
435 | } | |
436 | } | |
437 | ||
438 | /* FW bug: driver has to restart p2p-dev mode after scan */ | |
439 | if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) | |
440 | cw1200_disable_listening(priv); | |
441 | ret = wsm_set_template_frame(priv, &frame); | |
442 | priv->scan.direct_probe = 1; | |
443 | if (!ret) { | |
444 | wsm_flush_tx(priv); | |
445 | ret = cw1200_scan_start(priv, &scan); | |
446 | } | |
447 | mutex_unlock(&priv->conf_mutex); | |
448 | ||
449 | skb_push(frame.skb, txpriv->offset); | |
450 | if (!ret) | |
451 | IEEE80211_SKB_CB(frame.skb)->flags |= IEEE80211_TX_STAT_ACK; | |
452 | BUG_ON(cw1200_queue_remove(queue, priv->pending_frame_id)); | |
453 | ||
454 | if (ret) { | |
455 | priv->scan.direct_probe = 0; | |
456 | up(&priv->scan.lock); | |
457 | wsm_unlock_tx(priv); | |
458 | } | |
459 | ||
460 | return; | |
461 | } |