1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Scan implementation for ST-Ericsson CW1200 mac80211 drivers
4 *
5 * Copyright (c) 2010, ST-Ericsson
6 * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
7 */
8
9 #include <linux/sched.h>
10 #include "cw1200.h"
11 #include "scan.h"
12 #include "sta.h"
13 #include "pm.h"
14
15 static void cw1200_scan_restart_delayed(struct cw1200_common *priv);
16
cw1200_scan_start(struct cw1200_common * priv,struct wsm_scan * scan)17 static int cw1200_scan_start(struct cw1200_common *priv, struct wsm_scan *scan)
18 {
19 int ret, i;
20 int tmo = 2000;
21
22 switch (priv->join_status) {
23 case CW1200_JOIN_STATUS_PRE_STA:
24 case CW1200_JOIN_STATUS_JOINING:
25 return -EBUSY;
26 default:
27 break;
28 }
29
30 wiphy_dbg(priv->hw->wiphy, "[SCAN] hw req, type %d, %d channels, flags: 0x%x.\n",
31 scan->type, scan->num_channels, scan->flags);
32
33 for (i = 0; i < scan->num_channels; ++i)
34 tmo += scan->ch[i].max_chan_time + 10;
35
36 cancel_delayed_work_sync(&priv->clear_recent_scan_work);
37 atomic_set(&priv->scan.in_progress, 1);
38 atomic_set(&priv->recent_scan, 1);
39 cw1200_pm_stay_awake(&priv->pm_state, msecs_to_jiffies(tmo));
40 queue_delayed_work(priv->workqueue, &priv->scan.timeout,
41 msecs_to_jiffies(tmo));
42 ret = wsm_scan(priv, scan);
43 if (ret) {
44 atomic_set(&priv->scan.in_progress, 0);
45 cancel_delayed_work_sync(&priv->scan.timeout);
46 cw1200_scan_restart_delayed(priv);
47 }
48 return ret;
49 }
50
cw1200_hw_scan(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_scan_request * hw_req)51 int cw1200_hw_scan(struct ieee80211_hw *hw,
52 struct ieee80211_vif *vif,
53 struct ieee80211_scan_request *hw_req)
54 {
55 struct cw1200_common *priv = hw->priv;
56 struct cfg80211_scan_request *req = &hw_req->req;
57 struct wsm_template_frame frame = {
58 .frame_type = WSM_FRAME_TYPE_PROBE_REQUEST,
59 };
60 int i, ret;
61
62 if (!priv->vif)
63 return -EINVAL;
64
65 /* Scan when P2P_GO corrupt firmware MiniAP mode */
66 if (priv->join_status == CW1200_JOIN_STATUS_AP)
67 return -EOPNOTSUPP;
68
69 if (req->n_ssids == 1 && !req->ssids[0].ssid_len)
70 req->n_ssids = 0;
71
72 wiphy_dbg(hw->wiphy, "[SCAN] Scan request for %d SSIDs.\n",
73 req->n_ssids);
74
75 if (req->n_ssids > WSM_SCAN_MAX_NUM_OF_SSIDS)
76 return -EINVAL;
77
78 frame.skb = ieee80211_probereq_get(hw, priv->vif->addr, NULL, 0,
79 req->ie_len);
80 if (!frame.skb)
81 return -ENOMEM;
82
83 if (req->ie_len)
84 skb_put_data(frame.skb, req->ie, req->ie_len);
85
86 /* will be unlocked in cw1200_scan_work() */
87 down(&priv->scan.lock);
88 mutex_lock(&priv->conf_mutex);
89
90 ret = wsm_set_template_frame(priv, &frame);
91 if (!ret) {
92 /* Host want to be the probe responder. */
93 ret = wsm_set_probe_responder(priv, true);
94 }
95 if (ret) {
96 mutex_unlock(&priv->conf_mutex);
97 up(&priv->scan.lock);
98 dev_kfree_skb(frame.skb);
99 return ret;
100 }
101
102 wsm_lock_tx(priv);
103
104 BUG_ON(priv->scan.req);
105 priv->scan.req = req;
106 priv->scan.n_ssids = 0;
107 priv->scan.status = 0;
108 priv->scan.begin = &req->channels[0];
109 priv->scan.curr = priv->scan.begin;
110 priv->scan.end = &req->channels[req->n_channels];
111 priv->scan.output_power = priv->output_power;
112
113 for (i = 0; i < req->n_ssids; ++i) {
114 struct wsm_ssid *dst = &priv->scan.ssids[priv->scan.n_ssids];
115 memcpy(&dst->ssid[0], req->ssids[i].ssid, sizeof(dst->ssid));
116 dst->length = req->ssids[i].ssid_len;
117 ++priv->scan.n_ssids;
118 }
119
120 mutex_unlock(&priv->conf_mutex);
121 dev_kfree_skb(frame.skb);
122 queue_work(priv->workqueue, &priv->scan.work);
123 return 0;
124 }
125
cw1200_scan_work(struct work_struct * work)126 void cw1200_scan_work(struct work_struct *work)
127 {
128 struct cw1200_common *priv = container_of(work, struct cw1200_common,
129 scan.work);
130 struct ieee80211_channel **it;
131 struct wsm_scan scan = {
132 .type = WSM_SCAN_TYPE_FOREGROUND,
133 .flags = WSM_SCAN_FLAG_SPLIT_METHOD,
134 };
135 bool first_run = (priv->scan.begin == priv->scan.curr &&
136 priv->scan.begin != priv->scan.end);
137 int i;
138
139 if (first_run) {
140 /* Firmware gets crazy if scan request is sent
141 * when STA is joined but not yet associated.
142 * Force unjoin in this case.
143 */
144 if (cancel_delayed_work_sync(&priv->join_timeout) > 0)
145 cw1200_join_timeout(&priv->join_timeout.work);
146 }
147
148 mutex_lock(&priv->conf_mutex);
149
150 if (first_run) {
151 if (priv->join_status == CW1200_JOIN_STATUS_STA &&
152 !(priv->powersave_mode.mode & WSM_PSM_PS)) {
153 struct wsm_set_pm pm = priv->powersave_mode;
154 pm.mode = WSM_PSM_PS;
155 cw1200_set_pm(priv, &pm);
156 } else if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) {
157 /* FW bug: driver has to restart p2p-dev mode
158 * after scan
159 */
160 cw1200_disable_listening(priv);
161 }
162 }
163
164 if (!priv->scan.req || (priv->scan.curr == priv->scan.end)) {
165 struct cfg80211_scan_info info = {
166 .aborted = priv->scan.status ? 1 : 0,
167 };
168
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_warn(priv->hw->wiphy,
177 "[SCAN] Scan failed (%d).\n",
178 priv->scan.status);
179 else if (priv->scan.req)
180 wiphy_dbg(priv->hw->wiphy,
181 "[SCAN] Scan completed.\n");
182 else
183 wiphy_dbg(priv->hw->wiphy,
184 "[SCAN] Scan canceled.\n");
185
186 priv->scan.req = NULL;
187 cw1200_scan_restart_delayed(priv);
188 wsm_unlock_tx(priv);
189 mutex_unlock(&priv->conf_mutex);
190 ieee80211_scan_completed(priv->hw, &info);
191 up(&priv->scan.lock);
192 return;
193 } else {
194 struct ieee80211_channel *first = *priv->scan.curr;
195 for (it = priv->scan.curr + 1, i = 1;
196 it != priv->scan.end && i < WSM_SCAN_MAX_NUM_OF_CHANNELS;
197 ++it, ++i) {
198 if ((*it)->band != first->band)
199 break;
200 if (((*it)->flags ^ first->flags) &
201 IEEE80211_CHAN_NO_IR)
202 break;
203 if (!(first->flags & IEEE80211_CHAN_NO_IR) &&
204 (*it)->max_power != first->max_power)
205 break;
206 }
207 scan.band = first->band;
208
209 if (priv->scan.req->no_cck)
210 scan.max_tx_rate = WSM_TRANSMIT_RATE_6;
211 else
212 scan.max_tx_rate = WSM_TRANSMIT_RATE_1;
213 scan.num_probes =
214 (first->flags & IEEE80211_CHAN_NO_IR) ? 0 : 2;
215 scan.num_ssids = priv->scan.n_ssids;
216 scan.ssids = &priv->scan.ssids[0];
217 scan.num_channels = it - priv->scan.curr;
218 /* TODO: Is it optimal? */
219 scan.probe_delay = 100;
220 /* It is not stated in WSM specification, however
221 * FW team says that driver may not use FG scan
222 * when joined.
223 */
224 if (priv->join_status == CW1200_JOIN_STATUS_STA) {
225 scan.type = WSM_SCAN_TYPE_BACKGROUND;
226 scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND;
227 }
228 scan.ch = kzalloc_objs(struct wsm_scan_ch, it - priv->scan.curr);
229 if (!scan.ch) {
230 priv->scan.status = -ENOMEM;
231 goto fail;
232 }
233 for (i = 0; i < scan.num_channels; ++i) {
234 scan.ch[i].number = priv->scan.curr[i]->hw_value;
235 if (priv->scan.curr[i]->flags & IEEE80211_CHAN_NO_IR) {
236 scan.ch[i].min_chan_time = 50;
237 scan.ch[i].max_chan_time = 100;
238 } else {
239 scan.ch[i].min_chan_time = 10;
240 scan.ch[i].max_chan_time = 25;
241 }
242 }
243 if (!(first->flags & IEEE80211_CHAN_NO_IR) &&
244 priv->scan.output_power != first->max_power) {
245 priv->scan.output_power = first->max_power;
246 wsm_set_output_power(priv,
247 priv->scan.output_power * 10);
248 }
249 priv->scan.status = cw1200_scan_start(priv, &scan);
250 kfree(scan.ch);
251 if (priv->scan.status)
252 goto fail;
253 priv->scan.curr = it;
254 }
255 mutex_unlock(&priv->conf_mutex);
256 return;
257
258 fail:
259 priv->scan.curr = priv->scan.end;
260 mutex_unlock(&priv->conf_mutex);
261 queue_work(priv->workqueue, &priv->scan.work);
262 return;
263 }
264
cw1200_scan_restart_delayed(struct cw1200_common * priv)265 static void cw1200_scan_restart_delayed(struct cw1200_common *priv)
266 {
267 /* FW bug: driver has to restart p2p-dev mode after scan. */
268 if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) {
269 cw1200_enable_listening(priv);
270 cw1200_update_filtering(priv);
271 }
272
273 if (priv->delayed_unjoin) {
274 priv->delayed_unjoin = false;
275 if (queue_work(priv->workqueue, &priv->unjoin_work) <= 0)
276 wsm_unlock_tx(priv);
277 } else if (priv->delayed_link_loss) {
278 wiphy_dbg(priv->hw->wiphy, "[CQM] Requeue BSS loss.\n");
279 priv->delayed_link_loss = 0;
280 cw1200_cqm_bssloss_sm(priv, 1, 0, 0);
281 }
282 }
283
cw1200_scan_complete(struct cw1200_common * priv)284 static void cw1200_scan_complete(struct cw1200_common *priv)
285 {
286 queue_delayed_work(priv->workqueue, &priv->clear_recent_scan_work, HZ);
287 if (priv->scan.direct_probe) {
288 wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe complete.\n");
289 cw1200_scan_restart_delayed(priv);
290 priv->scan.direct_probe = 0;
291 up(&priv->scan.lock);
292 wsm_unlock_tx(priv);
293 } else {
294 cw1200_scan_work(&priv->scan.work);
295 }
296 }
297
cw1200_scan_failed_cb(struct cw1200_common * priv)298 void cw1200_scan_failed_cb(struct cw1200_common *priv)
299 {
300 if (priv->mode == NL80211_IFTYPE_UNSPECIFIED)
301 /* STA is stopped. */
302 return;
303
304 if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) {
305 priv->scan.status = -EIO;
306 queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0);
307 }
308 }
309
310
cw1200_scan_complete_cb(struct cw1200_common * priv,struct wsm_scan_complete * arg)311 void cw1200_scan_complete_cb(struct cw1200_common *priv,
312 struct wsm_scan_complete *arg)
313 {
314 if (priv->mode == NL80211_IFTYPE_UNSPECIFIED)
315 /* STA is stopped. */
316 return;
317
318 if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) {
319 priv->scan.status = 1;
320 queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0);
321 }
322 }
323
cw1200_clear_recent_scan_work(struct work_struct * work)324 void cw1200_clear_recent_scan_work(struct work_struct *work)
325 {
326 struct cw1200_common *priv =
327 container_of(work, struct cw1200_common,
328 clear_recent_scan_work.work);
329 atomic_xchg(&priv->recent_scan, 0);
330 }
331
cw1200_scan_timeout(struct work_struct * work)332 void cw1200_scan_timeout(struct work_struct *work)
333 {
334 struct cw1200_common *priv =
335 container_of(work, struct cw1200_common, scan.timeout.work);
336 if (atomic_xchg(&priv->scan.in_progress, 0)) {
337 if (priv->scan.status > 0) {
338 priv->scan.status = 0;
339 } else if (!priv->scan.status) {
340 wiphy_warn(priv->hw->wiphy,
341 "Timeout waiting for scan complete notification.\n");
342 priv->scan.status = -ETIMEDOUT;
343 priv->scan.curr = priv->scan.end;
344 wsm_stop_scan(priv);
345 }
346 cw1200_scan_complete(priv);
347 }
348 }
349
cw1200_probe_work(struct work_struct * work)350 void cw1200_probe_work(struct work_struct *work)
351 {
352 struct cw1200_common *priv =
353 container_of(work, struct cw1200_common, scan.probe_work.work);
354 u8 queue_id = cw1200_queue_get_queue_id(priv->pending_frame_id);
355 struct cw1200_queue *queue = &priv->tx_queue[queue_id];
356 const struct cw1200_txpriv *txpriv;
357 struct wsm_tx *wsm;
358 struct wsm_template_frame frame = {
359 .frame_type = WSM_FRAME_TYPE_PROBE_REQUEST,
360 };
361 struct wsm_ssid ssids[1] = {{
362 .length = 0,
363 } };
364 struct wsm_scan_ch ch[1] = {{
365 .min_chan_time = 0,
366 .max_chan_time = 10,
367 } };
368 struct wsm_scan scan = {
369 .type = WSM_SCAN_TYPE_FOREGROUND,
370 .num_probes = 1,
371 .probe_delay = 0,
372 .num_channels = 1,
373 .ssids = ssids,
374 .ch = ch,
375 };
376 u8 *ies;
377 size_t ies_len;
378 int ret;
379
380 wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe work.\n");
381
382 mutex_lock(&priv->conf_mutex);
383 if (down_trylock(&priv->scan.lock)) {
384 /* Scan is already in progress. Requeue self. */
385 schedule();
386 queue_delayed_work(priv->workqueue, &priv->scan.probe_work,
387 msecs_to_jiffies(100));
388 mutex_unlock(&priv->conf_mutex);
389 return;
390 }
391
392 /* Make sure we still have a pending probe req */
393 if (cw1200_queue_get_skb(queue, priv->pending_frame_id,
394 &frame.skb, &txpriv)) {
395 up(&priv->scan.lock);
396 mutex_unlock(&priv->conf_mutex);
397 wsm_unlock_tx(priv);
398 return;
399 }
400 wsm = (struct wsm_tx *)frame.skb->data;
401 scan.max_tx_rate = wsm->max_tx_rate;
402 scan.band = (priv->channel->band == NL80211_BAND_5GHZ) ?
403 WSM_PHY_BAND_5G : WSM_PHY_BAND_2_4G;
404 if (priv->join_status == CW1200_JOIN_STATUS_STA ||
405 priv->join_status == CW1200_JOIN_STATUS_IBSS) {
406 scan.type = WSM_SCAN_TYPE_BACKGROUND;
407 scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND;
408 }
409 ch[0].number = priv->channel->hw_value;
410
411 skb_pull(frame.skb, txpriv->offset);
412
413 ies = &frame.skb->data[sizeof(struct ieee80211_hdr_3addr)];
414 ies_len = frame.skb->len - sizeof(struct ieee80211_hdr_3addr);
415
416 if (ies_len) {
417 u8 *ssidie =
418 (u8 *)cfg80211_find_ie(WLAN_EID_SSID, ies, ies_len);
419 if (ssidie && ssidie[1] && ssidie[1] <= sizeof(ssids[0].ssid)) {
420 u8 *nextie = &ssidie[2 + ssidie[1]];
421 /* Remove SSID from the IE list. It has to be provided
422 * as a separate argument in cw1200_scan_start call
423 */
424
425 /* Store SSID localy */
426 ssids[0].length = ssidie[1];
427 memcpy(ssids[0].ssid, &ssidie[2], ssids[0].length);
428 scan.num_ssids = 1;
429
430 /* Remove SSID from IE list */
431 ssidie[1] = 0;
432 memmove(&ssidie[2], nextie, &ies[ies_len] - nextie);
433 skb_trim(frame.skb, frame.skb->len - ssids[0].length);
434 }
435 }
436
437 /* FW bug: driver has to restart p2p-dev mode after scan */
438 if (priv->join_status == CW1200_JOIN_STATUS_MONITOR)
439 cw1200_disable_listening(priv);
440 ret = wsm_set_template_frame(priv, &frame);
441 priv->scan.direct_probe = 1;
442 if (!ret) {
443 wsm_flush_tx(priv);
444 ret = cw1200_scan_start(priv, &scan);
445 }
446 mutex_unlock(&priv->conf_mutex);
447
448 skb_push(frame.skb, txpriv->offset);
449 if (!ret)
450 IEEE80211_SKB_CB(frame.skb)->flags |= IEEE80211_TX_STAT_ACK;
451 BUG_ON(cw1200_queue_remove(queue, priv->pending_frame_id));
452
453 if (ret) {
454 priv->scan.direct_probe = 0;
455 up(&priv->scan.lock);
456 wsm_unlock_tx(priv);
457 }
458
459 return;
460 }
461