1 /*
2 * This file is part of wl1271
3 *
4 * Copyright (C) 2008-2009 Nokia Corporation
5 *
6 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 *
22 */
23
24 #include "wl12xx.h"
25 #include "debug.h"
26 #include "reg.h"
27 #include "io.h"
28 #include "event.h"
29 #include "ps.h"
30 #include "scan.h"
31 #include "wl12xx_80211.h"
32
wl1271_pspoll_work(struct work_struct * work)33 void wl1271_pspoll_work(struct work_struct *work)
34 {
35 struct ieee80211_vif *vif;
36 struct wl12xx_vif *wlvif;
37 struct delayed_work *dwork;
38 struct wl1271 *wl;
39 int ret;
40
41 dwork = container_of(work, struct delayed_work, work);
42 wlvif = container_of(dwork, struct wl12xx_vif, pspoll_work);
43 vif = container_of((void *)wlvif, struct ieee80211_vif, drv_priv);
44 wl = wlvif->wl;
45
46 wl1271_debug(DEBUG_EVENT, "pspoll work");
47
48 mutex_lock(&wl->mutex);
49
50 if (unlikely(wl->state == WL1271_STATE_OFF))
51 goto out;
52
53 if (!test_and_clear_bit(WLVIF_FLAG_PSPOLL_FAILURE, &wlvif->flags))
54 goto out;
55
56 if (!test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
57 goto out;
58
59 /*
60 * if we end up here, then we were in powersave when the pspoll
61 * delivery failure occurred, and no-one changed state since, so
62 * we should go back to powersave.
63 */
64 ret = wl1271_ps_elp_wakeup(wl);
65 if (ret < 0)
66 goto out;
67
68 wl1271_ps_set_mode(wl, wlvif, STATION_POWER_SAVE_MODE,
69 wlvif->basic_rate, true);
70
71 wl1271_ps_elp_sleep(wl);
72 out:
73 mutex_unlock(&wl->mutex);
74 };
75
wl1271_event_pspoll_delivery_fail(struct wl1271 * wl,struct wl12xx_vif * wlvif)76 static void wl1271_event_pspoll_delivery_fail(struct wl1271 *wl,
77 struct wl12xx_vif *wlvif)
78 {
79 int delay = wl->conf.conn.ps_poll_recovery_period;
80 int ret;
81
82 wlvif->ps_poll_failures++;
83 if (wlvif->ps_poll_failures == 1)
84 wl1271_info("AP with dysfunctional ps-poll, "
85 "trying to work around it.");
86
87 /* force active mode receive data from the AP */
88 if (test_bit(WLVIF_FLAG_PSM, &wlvif->flags)) {
89 ret = wl1271_ps_set_mode(wl, wlvif, STATION_ACTIVE_MODE,
90 wlvif->basic_rate, true);
91 if (ret < 0)
92 return;
93 set_bit(WLVIF_FLAG_PSPOLL_FAILURE, &wlvif->flags);
94 ieee80211_queue_delayed_work(wl->hw, &wlvif->pspoll_work,
95 msecs_to_jiffies(delay));
96 }
97
98 /*
99 * If already in active mode, lets we should be getting data from
100 * the AP right away. If we enter PSM too fast after this, and data
101 * remains on the AP, we will get another event like this, and we'll
102 * go into active once more.
103 */
104 }
105
wl1271_event_ps_report(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct event_mailbox * mbox,bool * beacon_loss)106 static int wl1271_event_ps_report(struct wl1271 *wl,
107 struct wl12xx_vif *wlvif,
108 struct event_mailbox *mbox,
109 bool *beacon_loss)
110 {
111 int ret = 0;
112 u32 total_retries = wl->conf.conn.psm_entry_retries;
113
114 wl1271_debug(DEBUG_EVENT, "ps_status: 0x%x", mbox->ps_status);
115
116 switch (mbox->ps_status) {
117 case EVENT_ENTER_POWER_SAVE_FAIL:
118 wl1271_debug(DEBUG_PSM, "PSM entry failed");
119
120 if (!test_bit(WLVIF_FLAG_PSM, &wlvif->flags)) {
121 /* remain in active mode */
122 wlvif->psm_entry_retry = 0;
123 break;
124 }
125
126 if (wlvif->psm_entry_retry < total_retries) {
127 wlvif->psm_entry_retry++;
128 ret = wl1271_ps_set_mode(wl, wlvif,
129 STATION_POWER_SAVE_MODE,
130 wlvif->basic_rate, true);
131 } else {
132 wl1271_info("No ack to nullfunc from AP.");
133 wlvif->psm_entry_retry = 0;
134 *beacon_loss = true;
135 }
136 break;
137 case EVENT_ENTER_POWER_SAVE_SUCCESS:
138 wlvif->psm_entry_retry = 0;
139
140 /*
141 * BET has only a minor effect in 5GHz and masks
142 * channel switch IEs, so we only enable BET on 2.4GHz
143 */
144 if (wlvif->band == IEEE80211_BAND_2GHZ)
145 /* enable beacon early termination */
146 ret = wl1271_acx_bet_enable(wl, wlvif, true);
147
148 if (wlvif->ps_compl) {
149 complete(wlvif->ps_compl);
150 wlvif->ps_compl = NULL;
151 }
152 break;
153 default:
154 break;
155 }
156
157 return ret;
158 }
159
wl1271_event_rssi_trigger(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct event_mailbox * mbox)160 static void wl1271_event_rssi_trigger(struct wl1271 *wl,
161 struct wl12xx_vif *wlvif,
162 struct event_mailbox *mbox)
163 {
164 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
165 enum nl80211_cqm_rssi_threshold_event event;
166 s8 metric = mbox->rssi_snr_trigger_metric[0];
167
168 wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);
169
170 if (metric <= wlvif->rssi_thold)
171 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
172 else
173 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
174
175 if (event != wlvif->last_rssi_event)
176 ieee80211_cqm_rssi_notify(vif, event, GFP_KERNEL);
177 wlvif->last_rssi_event = event;
178 }
179
wl1271_stop_ba_event(struct wl1271 * wl,struct wl12xx_vif * wlvif)180 static void wl1271_stop_ba_event(struct wl1271 *wl, struct wl12xx_vif *wlvif)
181 {
182 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
183
184 if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
185 if (!wlvif->sta.ba_rx_bitmap)
186 return;
187 ieee80211_stop_rx_ba_session(vif, wlvif->sta.ba_rx_bitmap,
188 vif->bss_conf.bssid);
189 } else {
190 u8 hlid;
191 struct wl1271_link *lnk;
192 for_each_set_bit(hlid, wlvif->ap.sta_hlid_map,
193 WL12XX_MAX_LINKS) {
194 lnk = &wl->links[hlid];
195 if (!lnk->ba_bitmap)
196 continue;
197
198 ieee80211_stop_rx_ba_session(vif,
199 lnk->ba_bitmap,
200 lnk->addr);
201 }
202 }
203 }
204
wl12xx_event_soft_gemini_sense(struct wl1271 * wl,u8 enable)205 static void wl12xx_event_soft_gemini_sense(struct wl1271 *wl,
206 u8 enable)
207 {
208 struct ieee80211_vif *vif;
209 struct wl12xx_vif *wlvif;
210
211 if (enable) {
212 /* disable dynamic PS when requested by the firmware */
213 wl12xx_for_each_wlvif_sta(wl, wlvif) {
214 vif = wl12xx_wlvif_to_vif(wlvif);
215 ieee80211_disable_dyn_ps(vif);
216 }
217 set_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags);
218 } else {
219 clear_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags);
220 wl12xx_for_each_wlvif_sta(wl, wlvif) {
221 vif = wl12xx_wlvif_to_vif(wlvif);
222 ieee80211_enable_dyn_ps(vif);
223 wl1271_recalc_rx_streaming(wl, wlvif);
224 }
225 }
226
227 }
228
wl1271_event_mbox_dump(struct event_mailbox * mbox)229 static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
230 {
231 wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
232 wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
233 wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
234 }
235
wl1271_event_process(struct wl1271 * wl,struct event_mailbox * mbox)236 static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
237 {
238 struct ieee80211_vif *vif;
239 struct wl12xx_vif *wlvif;
240 int ret;
241 u32 vector;
242 bool beacon_loss = false;
243 bool disconnect_sta = false;
244 unsigned long sta_bitmap = 0;
245
246 wl1271_event_mbox_dump(mbox);
247
248 vector = le32_to_cpu(mbox->events_vector);
249 vector &= ~(le32_to_cpu(mbox->events_mask));
250 wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
251
252 if (vector & SCAN_COMPLETE_EVENT_ID) {
253 wl1271_debug(DEBUG_EVENT, "status: 0x%x",
254 mbox->scheduled_scan_status);
255
256 wl1271_scan_stm(wl, wl->scan_vif);
257 }
258
259 if (vector & PERIODIC_SCAN_REPORT_EVENT_ID) {
260 wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_REPORT_EVENT "
261 "(status 0x%0x)", mbox->scheduled_scan_status);
262
263 wl1271_scan_sched_scan_results(wl);
264 }
265
266 if (vector & PERIODIC_SCAN_COMPLETE_EVENT_ID) {
267 wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_COMPLETE_EVENT "
268 "(status 0x%0x)", mbox->scheduled_scan_status);
269 if (wl->sched_scanning) {
270 ieee80211_sched_scan_stopped(wl->hw);
271 wl->sched_scanning = false;
272 }
273 }
274
275 if (vector & SOFT_GEMINI_SENSE_EVENT_ID)
276 wl12xx_event_soft_gemini_sense(wl,
277 mbox->soft_gemini_sense_info);
278
279 /*
280 * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
281 * filtering) is enabled. Without PSM, the stack will receive all
282 * beacons and can detect beacon loss by itself.
283 *
284 * As there's possibility that the driver disables PSM before receiving
285 * BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
286 *
287 */
288 if (vector & BSS_LOSE_EVENT_ID) {
289 /* TODO: check for multi-role */
290 wl1271_info("Beacon loss detected.");
291
292 /* indicate to the stack, that beacons have been lost */
293 beacon_loss = true;
294 }
295
296 if (vector & PS_REPORT_EVENT_ID) {
297 wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
298 wl12xx_for_each_wlvif_sta(wl, wlvif) {
299 ret = wl1271_event_ps_report(wl, wlvif,
300 mbox, &beacon_loss);
301 if (ret < 0)
302 return ret;
303 }
304 }
305
306 if (vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID)
307 wl12xx_for_each_wlvif_sta(wl, wlvif) {
308 wl1271_event_pspoll_delivery_fail(wl, wlvif);
309 }
310
311 if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
312 /* TODO: check actual multi-role support */
313 wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
314 wl12xx_for_each_wlvif_sta(wl, wlvif) {
315 wl1271_event_rssi_trigger(wl, wlvif, mbox);
316 }
317 }
318
319 if (vector & BA_SESSION_RX_CONSTRAINT_EVENT_ID) {
320 u8 role_id = mbox->role_id;
321 wl1271_debug(DEBUG_EVENT, "BA_SESSION_RX_CONSTRAINT_EVENT_ID. "
322 "ba_allowed = 0x%x, role_id=%d",
323 mbox->rx_ba_allowed, role_id);
324
325 wl12xx_for_each_wlvif(wl, wlvif) {
326 if (role_id != 0xff && role_id != wlvif->role_id)
327 continue;
328
329 wlvif->ba_allowed = !!mbox->rx_ba_allowed;
330 if (!wlvif->ba_allowed)
331 wl1271_stop_ba_event(wl, wlvif);
332 }
333 }
334
335 if (vector & CHANNEL_SWITCH_COMPLETE_EVENT_ID) {
336 wl1271_debug(DEBUG_EVENT, "CHANNEL_SWITCH_COMPLETE_EVENT_ID. "
337 "status = 0x%x",
338 mbox->channel_switch_status);
339 /*
340 * That event uses for two cases:
341 * 1) channel switch complete with status=0
342 * 2) channel switch failed status=1
343 */
344
345 /* TODO: configure only the relevant vif */
346 wl12xx_for_each_wlvif_sta(wl, wlvif) {
347 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
348 bool success;
349
350 if (!test_and_clear_bit(WLVIF_FLAG_CS_PROGRESS,
351 &wl->flags))
352 continue;
353
354 success = mbox->channel_switch_status ? false : true;
355 ieee80211_chswitch_done(vif, success);
356 }
357 }
358
359 if ((vector & DUMMY_PACKET_EVENT_ID)) {
360 wl1271_debug(DEBUG_EVENT, "DUMMY_PACKET_ID_EVENT_ID");
361 wl1271_tx_dummy_packet(wl);
362 }
363
364 /*
365 * "TX retries exceeded" has a different meaning according to mode.
366 * In AP mode the offending station is disconnected.
367 */
368 if (vector & MAX_TX_RETRY_EVENT_ID) {
369 wl1271_debug(DEBUG_EVENT, "MAX_TX_RETRY_EVENT_ID");
370 sta_bitmap |= le16_to_cpu(mbox->sta_tx_retry_exceeded);
371 disconnect_sta = true;
372 }
373
374 if (vector & INACTIVE_STA_EVENT_ID) {
375 wl1271_debug(DEBUG_EVENT, "INACTIVE_STA_EVENT_ID");
376 sta_bitmap |= le16_to_cpu(mbox->sta_aging_status);
377 disconnect_sta = true;
378 }
379
380 if (disconnect_sta) {
381 u32 num_packets = wl->conf.tx.max_tx_retries;
382 struct ieee80211_sta *sta;
383 const u8 *addr;
384 int h;
385
386 for_each_set_bit(h, &sta_bitmap, WL12XX_MAX_LINKS) {
387 bool found = false;
388 /* find the ap vif connected to this sta */
389 wl12xx_for_each_wlvif_ap(wl, wlvif) {
390 if (!test_bit(h, wlvif->ap.sta_hlid_map))
391 continue;
392 found = true;
393 break;
394 }
395 if (!found)
396 continue;
397
398 vif = wl12xx_wlvif_to_vif(wlvif);
399 addr = wl->links[h].addr;
400
401 rcu_read_lock();
402 sta = ieee80211_find_sta(vif, addr);
403 if (sta) {
404 wl1271_debug(DEBUG_EVENT, "remove sta %d", h);
405 ieee80211_report_low_ack(sta, num_packets);
406 }
407 rcu_read_unlock();
408 }
409 }
410
411 if (beacon_loss)
412 wl12xx_for_each_wlvif_sta(wl, wlvif) {
413 vif = wl12xx_wlvif_to_vif(wlvif);
414 ieee80211_connection_loss(vif);
415 }
416
417 return 0;
418 }
419
wl1271_event_unmask(struct wl1271 * wl)420 int wl1271_event_unmask(struct wl1271 *wl)
421 {
422 int ret;
423
424 ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
425 if (ret < 0)
426 return ret;
427
428 return 0;
429 }
430
wl1271_event_mbox_config(struct wl1271 * wl)431 void wl1271_event_mbox_config(struct wl1271 *wl)
432 {
433 wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
434 wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
435
436 wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
437 wl->mbox_ptr[0], wl->mbox_ptr[1]);
438 }
439
wl1271_event_handle(struct wl1271 * wl,u8 mbox_num)440 int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
441 {
442 struct event_mailbox mbox;
443 int ret;
444
445 wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
446
447 if (mbox_num > 1)
448 return -EINVAL;
449
450 /* first we read the mbox descriptor */
451 wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
452 sizeof(struct event_mailbox), false);
453
454 /* process the descriptor */
455 ret = wl1271_event_process(wl, &mbox);
456 if (ret < 0)
457 return ret;
458
459 /* then we let the firmware know it can go on...*/
460 wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
461
462 return 0;
463 }
464