1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * mac80211 glue code for mac80211 Prism54 drivers
4  *
5  * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
6  * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8  *
9  * Based on:
10  * - the islsm (softmac prism54) driver, which is:
11  *   Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
12  * - stlc45xx driver
13  *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
14  */
15 
16 #include <linux/slab.h>
17 #include <linux/firmware.h>
18 #include <linux/etherdevice.h>
19 #include <linux/module.h>
20 
21 #include <net/mac80211.h>
22 
23 #include "p54.h"
24 #include "lmac.h"
25 
26 static bool modparam_nohwcrypt;
27 module_param_named(nohwcrypt, modparam_nohwcrypt, bool, 0444);
28 MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
29 MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
30 MODULE_DESCRIPTION("Softmac Prism54 common code");
31 MODULE_LICENSE("GPL");
32 MODULE_ALIAS("prism54common");
33 
p54_sta_add_remove(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_sta * sta)34 static int p54_sta_add_remove(struct ieee80211_hw *hw,
35 			      struct ieee80211_vif *vif,
36 			      struct ieee80211_sta *sta)
37 {
38 	struct p54_common *priv = hw->priv;
39 
40 	/*
41 	 * Notify the firmware that we don't want or we don't
42 	 * need to buffer frames for this station anymore.
43 	 */
44 
45 	p54_sta_unlock(priv, sta->addr);
46 
47 	return 0;
48 }
49 
p54_sta_notify(struct ieee80211_hw * dev,struct ieee80211_vif * vif,enum sta_notify_cmd notify_cmd,struct ieee80211_sta * sta)50 static void p54_sta_notify(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
51 			      enum sta_notify_cmd notify_cmd,
52 			      struct ieee80211_sta *sta)
53 {
54 	struct p54_common *priv = dev->priv;
55 
56 	switch (notify_cmd) {
57 	case STA_NOTIFY_AWAKE:
58 		/* update the firmware's filter table */
59 		p54_sta_unlock(priv, sta->addr);
60 		break;
61 	default:
62 		break;
63 	}
64 }
65 
p54_set_tim(struct ieee80211_hw * dev,struct ieee80211_sta * sta,bool set)66 static int p54_set_tim(struct ieee80211_hw *dev, struct ieee80211_sta *sta,
67 			bool set)
68 {
69 	struct p54_common *priv = dev->priv;
70 
71 	return p54_update_beacon_tim(priv, sta->aid, set);
72 }
73 
p54_find_ie(struct sk_buff * skb,u8 ie)74 u8 *p54_find_ie(struct sk_buff *skb, u8 ie)
75 {
76 	struct ieee80211_mgmt *mgmt = (void *)skb->data;
77 	u8 *pos, *end;
78 
79 	if (skb->len <= sizeof(mgmt))
80 		return NULL;
81 
82 	pos = (u8 *)mgmt->u.beacon.variable;
83 	end = skb->data + skb->len;
84 	while (pos < end) {
85 		if (pos + 2 + pos[1] > end)
86 			return NULL;
87 
88 		if (pos[0] == ie)
89 			return pos;
90 
91 		pos += 2 + pos[1];
92 	}
93 	return NULL;
94 }
95 
p54_beacon_format_ie_tim(struct sk_buff * skb)96 static int p54_beacon_format_ie_tim(struct sk_buff *skb)
97 {
98 	/*
99 	 * the good excuse for this mess is ... the firmware.
100 	 * The dummy TIM MUST be at the end of the beacon frame,
101 	 * because it'll be overwritten!
102 	 */
103 	u8 *tim;
104 	u8 dtim_len;
105 	u8 dtim_period;
106 	u8 *next;
107 
108 	tim = p54_find_ie(skb, WLAN_EID_TIM);
109 	if (!tim)
110 		return 0;
111 
112 	dtim_len = tim[1];
113 	dtim_period = tim[3];
114 	next = tim + 2 + dtim_len;
115 
116 	if (dtim_len < 3)
117 		return -EINVAL;
118 
119 	memmove(tim, next, skb_tail_pointer(skb) - next);
120 	tim = skb_tail_pointer(skb) - (dtim_len + 2);
121 
122 	/* add the dummy at the end */
123 	tim[0] = WLAN_EID_TIM;
124 	tim[1] = 3;
125 	tim[2] = 0;
126 	tim[3] = dtim_period;
127 	tim[4] = 0;
128 
129 	if (dtim_len > 3)
130 		skb_trim(skb, skb->len - (dtim_len - 3));
131 
132 	return 0;
133 }
134 
p54_beacon_update(struct p54_common * priv,struct ieee80211_vif * vif)135 static int p54_beacon_update(struct p54_common *priv,
136 			struct ieee80211_vif *vif)
137 {
138 	struct ieee80211_tx_control control = { };
139 	struct sk_buff *beacon;
140 	int ret;
141 
142 	beacon = ieee80211_beacon_get(priv->hw, vif, 0);
143 	if (!beacon)
144 		return -ENOMEM;
145 	ret = p54_beacon_format_ie_tim(beacon);
146 	if (ret)
147 		return ret;
148 
149 	/*
150 	 * During operation, the firmware takes care of beaconing.
151 	 * The driver only needs to upload a new beacon template, once
152 	 * the template was changed by the stack or userspace.
153 	 *
154 	 * LMAC API 3.2.2 also specifies that the driver does not need
155 	 * to cancel the old beacon template by hand, instead the firmware
156 	 * will release the previous one through the feedback mechanism.
157 	 */
158 	p54_tx_80211(priv->hw, &control, beacon);
159 	priv->tsf_high32 = 0;
160 	priv->tsf_low32 = 0;
161 
162 	return 0;
163 }
164 
p54_start(struct ieee80211_hw * dev)165 static int p54_start(struct ieee80211_hw *dev)
166 {
167 	struct p54_common *priv = dev->priv;
168 	int err;
169 
170 	mutex_lock(&priv->conf_mutex);
171 	err = priv->open(dev);
172 	if (err)
173 		goto out;
174 	P54_SET_QUEUE(priv->qos_params[0], 0x0002, 0x0003, 0x0007, 47);
175 	P54_SET_QUEUE(priv->qos_params[1], 0x0002, 0x0007, 0x000f, 94);
176 	P54_SET_QUEUE(priv->qos_params[2], 0x0003, 0x000f, 0x03ff, 0);
177 	P54_SET_QUEUE(priv->qos_params[3], 0x0007, 0x000f, 0x03ff, 0);
178 	err = p54_set_edcf(priv);
179 	if (err)
180 		goto out;
181 
182 	eth_broadcast_addr(priv->bssid);
183 	priv->mode = NL80211_IFTYPE_MONITOR;
184 	err = p54_setup_mac(priv);
185 	if (err) {
186 		priv->mode = NL80211_IFTYPE_UNSPECIFIED;
187 		goto out;
188 	}
189 
190 	ieee80211_queue_delayed_work(dev, &priv->work, 0);
191 
192 	priv->softled_state = 0;
193 	err = p54_set_leds(priv);
194 
195 out:
196 	mutex_unlock(&priv->conf_mutex);
197 	return err;
198 }
199 
p54_stop(struct ieee80211_hw * dev)200 static void p54_stop(struct ieee80211_hw *dev)
201 {
202 	struct p54_common *priv = dev->priv;
203 	int i;
204 
205 	priv->mode = NL80211_IFTYPE_UNSPECIFIED;
206 	priv->softled_state = 0;
207 	cancel_delayed_work_sync(&priv->work);
208 	mutex_lock(&priv->conf_mutex);
209 	p54_set_leds(priv);
210 	priv->stop(dev);
211 	skb_queue_purge(&priv->tx_pending);
212 	skb_queue_purge(&priv->tx_queue);
213 	for (i = 0; i < P54_QUEUE_NUM; i++) {
214 		priv->tx_stats[i].count = 0;
215 		priv->tx_stats[i].len = 0;
216 	}
217 
218 	priv->beacon_req_id = cpu_to_le32(0);
219 	priv->tsf_high32 = priv->tsf_low32 = 0;
220 	mutex_unlock(&priv->conf_mutex);
221 }
222 
p54_add_interface(struct ieee80211_hw * dev,struct ieee80211_vif * vif)223 static int p54_add_interface(struct ieee80211_hw *dev,
224 			     struct ieee80211_vif *vif)
225 {
226 	struct p54_common *priv = dev->priv;
227 	int err;
228 
229 	vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER;
230 
231 	mutex_lock(&priv->conf_mutex);
232 	if (priv->mode != NL80211_IFTYPE_MONITOR) {
233 		mutex_unlock(&priv->conf_mutex);
234 		return -EOPNOTSUPP;
235 	}
236 
237 	priv->vif = vif;
238 
239 	switch (vif->type) {
240 	case NL80211_IFTYPE_STATION:
241 	case NL80211_IFTYPE_ADHOC:
242 	case NL80211_IFTYPE_AP:
243 	case NL80211_IFTYPE_MESH_POINT:
244 		priv->mode = vif->type;
245 		break;
246 	default:
247 		mutex_unlock(&priv->conf_mutex);
248 		return -EOPNOTSUPP;
249 	}
250 
251 	memcpy(priv->mac_addr, vif->addr, ETH_ALEN);
252 	err = p54_setup_mac(priv);
253 	mutex_unlock(&priv->conf_mutex);
254 	return err;
255 }
256 
p54_remove_interface(struct ieee80211_hw * dev,struct ieee80211_vif * vif)257 static void p54_remove_interface(struct ieee80211_hw *dev,
258 				 struct ieee80211_vif *vif)
259 {
260 	struct p54_common *priv = dev->priv;
261 
262 	mutex_lock(&priv->conf_mutex);
263 	priv->vif = NULL;
264 
265 	/*
266 	 * LMAC API 3.2.2 states that any active beacon template must be
267 	 * canceled by the driver before attempting a mode transition.
268 	 */
269 	if (le32_to_cpu(priv->beacon_req_id) != 0) {
270 		p54_tx_cancel(priv, priv->beacon_req_id);
271 		wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ);
272 	}
273 	priv->mode = NL80211_IFTYPE_MONITOR;
274 	eth_zero_addr(priv->mac_addr);
275 	eth_zero_addr(priv->bssid);
276 	p54_setup_mac(priv);
277 	mutex_unlock(&priv->conf_mutex);
278 }
279 
p54_wait_for_stats(struct ieee80211_hw * dev)280 static int p54_wait_for_stats(struct ieee80211_hw *dev)
281 {
282 	struct p54_common *priv = dev->priv;
283 	int ret;
284 
285 	priv->update_stats = true;
286 	ret = p54_fetch_statistics(priv);
287 	if (ret)
288 		return ret;
289 
290 	ret = wait_for_completion_interruptible_timeout(&priv->stat_comp, HZ);
291 	if (ret == 0)
292 		return -ETIMEDOUT;
293 
294 	return 0;
295 }
296 
p54_reset_stats(struct p54_common * priv)297 static void p54_reset_stats(struct p54_common *priv)
298 {
299 	struct ieee80211_channel *chan = priv->curchan;
300 
301 	if (chan) {
302 		struct survey_info *info = &priv->survey[chan->hw_value];
303 
304 		/* only reset channel statistics, don't touch .filled, etc. */
305 		info->time = 0;
306 		info->time_busy = 0;
307 		info->time_tx = 0;
308 	}
309 
310 	priv->update_stats = true;
311 	priv->survey_raw.active = 0;
312 	priv->survey_raw.cca = 0;
313 	priv->survey_raw.tx = 0;
314 }
315 
p54_config(struct ieee80211_hw * dev,u32 changed)316 static int p54_config(struct ieee80211_hw *dev, u32 changed)
317 {
318 	int ret = 0;
319 	struct p54_common *priv = dev->priv;
320 	struct ieee80211_conf *conf = &dev->conf;
321 
322 	mutex_lock(&priv->conf_mutex);
323 	if (changed & IEEE80211_CONF_CHANGE_POWER)
324 		priv->output_power = conf->power_level << 2;
325 	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
326 		struct ieee80211_channel *oldchan;
327 		WARN_ON(p54_wait_for_stats(dev));
328 		oldchan = priv->curchan;
329 		priv->curchan = NULL;
330 		ret = p54_scan(priv, P54_SCAN_EXIT, 0);
331 		if (ret) {
332 			priv->curchan = oldchan;
333 			goto out;
334 		}
335 		/*
336 		 * TODO: Use the LM_SCAN_TRAP to determine the current
337 		 * operating channel.
338 		 */
339 		priv->curchan = priv->hw->conf.chandef.chan;
340 		p54_reset_stats(priv);
341 		WARN_ON(p54_fetch_statistics(priv));
342 	}
343 	if (changed & IEEE80211_CONF_CHANGE_PS) {
344 		WARN_ON(p54_wait_for_stats(dev));
345 		ret = p54_set_ps(priv);
346 		if (ret)
347 			goto out;
348 		WARN_ON(p54_wait_for_stats(dev));
349 	}
350 	if (changed & IEEE80211_CONF_CHANGE_IDLE) {
351 		WARN_ON(p54_wait_for_stats(dev));
352 		ret = p54_setup_mac(priv);
353 		if (ret)
354 			goto out;
355 		WARN_ON(p54_wait_for_stats(dev));
356 	}
357 
358 out:
359 	mutex_unlock(&priv->conf_mutex);
360 	return ret;
361 }
362 
p54_prepare_multicast(struct ieee80211_hw * dev,struct netdev_hw_addr_list * mc_list)363 static u64 p54_prepare_multicast(struct ieee80211_hw *dev,
364 				 struct netdev_hw_addr_list *mc_list)
365 {
366 	struct p54_common *priv = dev->priv;
367 	struct netdev_hw_addr *ha;
368 	int i;
369 
370 	BUILD_BUG_ON(ARRAY_SIZE(priv->mc_maclist) !=
371 		ARRAY_SIZE(((struct p54_group_address_table *)NULL)->mac_list));
372 	/*
373 	 * The first entry is reserved for the global broadcast MAC.
374 	 * Otherwise the firmware will drop it and ARP will no longer work.
375 	 */
376 	i = 1;
377 	priv->mc_maclist_num = netdev_hw_addr_list_count(mc_list) + i;
378 	netdev_hw_addr_list_for_each(ha, mc_list) {
379 		memcpy(&priv->mc_maclist[i], ha->addr, ETH_ALEN);
380 		i++;
381 		if (i >= ARRAY_SIZE(priv->mc_maclist))
382 			break;
383 	}
384 
385 	return 1; /* update */
386 }
387 
p54_configure_filter(struct ieee80211_hw * dev,unsigned int changed_flags,unsigned int * total_flags,u64 multicast)388 static void p54_configure_filter(struct ieee80211_hw *dev,
389 				 unsigned int changed_flags,
390 				 unsigned int *total_flags,
391 				 u64 multicast)
392 {
393 	struct p54_common *priv = dev->priv;
394 
395 	*total_flags &= FIF_ALLMULTI | FIF_OTHER_BSS;
396 
397 	priv->filter_flags = *total_flags;
398 
399 	if (changed_flags & FIF_OTHER_BSS)
400 		p54_setup_mac(priv);
401 
402 	if (changed_flags & FIF_ALLMULTI || multicast)
403 		p54_set_groupfilter(priv);
404 }
405 
p54_conf_tx(struct ieee80211_hw * dev,struct ieee80211_vif * vif,unsigned int link_id,u16 queue,const struct ieee80211_tx_queue_params * params)406 static int p54_conf_tx(struct ieee80211_hw *dev,
407 		       struct ieee80211_vif *vif,
408 		       unsigned int link_id, u16 queue,
409 		       const struct ieee80211_tx_queue_params *params)
410 {
411 	struct p54_common *priv = dev->priv;
412 	int ret;
413 
414 	mutex_lock(&priv->conf_mutex);
415 	P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
416 		      params->cw_min, params->cw_max, params->txop);
417 	ret = p54_set_edcf(priv);
418 	mutex_unlock(&priv->conf_mutex);
419 	return ret;
420 }
421 
p54_work(struct work_struct * work)422 static void p54_work(struct work_struct *work)
423 {
424 	struct p54_common *priv = container_of(work, struct p54_common,
425 					       work.work);
426 
427 	if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
428 		return ;
429 
430 	/*
431 	 * TODO: walk through tx_queue and do the following tasks
432 	 * 	1. initiate bursts.
433 	 *      2. cancel stuck frames / reset the device if necessary.
434 	 */
435 
436 	mutex_lock(&priv->conf_mutex);
437 	WARN_ON_ONCE(p54_fetch_statistics(priv));
438 	mutex_unlock(&priv->conf_mutex);
439 }
440 
p54_get_stats(struct ieee80211_hw * dev,struct ieee80211_low_level_stats * stats)441 static int p54_get_stats(struct ieee80211_hw *dev,
442 			 struct ieee80211_low_level_stats *stats)
443 {
444 	struct p54_common *priv = dev->priv;
445 
446 	memcpy(stats, &priv->stats, sizeof(*stats));
447 	return 0;
448 }
449 
p54_bss_info_changed(struct ieee80211_hw * dev,struct ieee80211_vif * vif,struct ieee80211_bss_conf * info,u64 changed)450 static void p54_bss_info_changed(struct ieee80211_hw *dev,
451 				 struct ieee80211_vif *vif,
452 				 struct ieee80211_bss_conf *info,
453 				 u64 changed)
454 {
455 	struct p54_common *priv = dev->priv;
456 
457 	mutex_lock(&priv->conf_mutex);
458 	if (changed & BSS_CHANGED_BSSID) {
459 		memcpy(priv->bssid, info->bssid, ETH_ALEN);
460 		p54_setup_mac(priv);
461 	}
462 
463 	if (changed & BSS_CHANGED_BEACON) {
464 		p54_scan(priv, P54_SCAN_EXIT, 0);
465 		p54_setup_mac(priv);
466 		p54_beacon_update(priv, vif);
467 		p54_set_edcf(priv);
468 	}
469 
470 	if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
471 		priv->use_short_slot = info->use_short_slot;
472 		p54_set_edcf(priv);
473 	}
474 	if (changed & BSS_CHANGED_BASIC_RATES) {
475 		if (dev->conf.chandef.chan->band == NL80211_BAND_5GHZ)
476 			priv->basic_rate_mask = (info->basic_rates << 4);
477 		else
478 			priv->basic_rate_mask = info->basic_rates;
479 		p54_setup_mac(priv);
480 		if (priv->fw_var >= 0x500)
481 			p54_scan(priv, P54_SCAN_EXIT, 0);
482 	}
483 	if (changed & BSS_CHANGED_ASSOC) {
484 		if (vif->cfg.assoc) {
485 			priv->aid = vif->cfg.aid;
486 			priv->wakeup_timer = info->beacon_int *
487 					     info->dtim_period * 5;
488 			p54_setup_mac(priv);
489 		} else {
490 			priv->wakeup_timer = 500;
491 			priv->aid = 0;
492 		}
493 	}
494 
495 	mutex_unlock(&priv->conf_mutex);
496 }
497 
p54_set_key(struct ieee80211_hw * dev,enum set_key_cmd cmd,struct ieee80211_vif * vif,struct ieee80211_sta * sta,struct ieee80211_key_conf * key)498 static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
499 		       struct ieee80211_vif *vif, struct ieee80211_sta *sta,
500 		       struct ieee80211_key_conf *key)
501 {
502 	struct p54_common *priv = dev->priv;
503 	int slot, ret = 0;
504 	u8 algo = 0;
505 	u8 *addr = NULL;
506 
507 	if (modparam_nohwcrypt)
508 		return -EOPNOTSUPP;
509 
510 	if (key->flags & IEEE80211_KEY_FLAG_RX_MGMT) {
511 		/*
512 		 * Unfortunately most/all firmwares are trying to decrypt
513 		 * incoming management frames if a suitable key can be found.
514 		 * However, in doing so the data in these frames gets
515 		 * corrupted. So, we can't have firmware supported crypto
516 		 * offload in this case.
517 		 */
518 		return -EOPNOTSUPP;
519 	}
520 
521 	mutex_lock(&priv->conf_mutex);
522 	if (cmd == SET_KEY) {
523 		switch (key->cipher) {
524 		case WLAN_CIPHER_SUITE_TKIP:
525 			if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
526 			      BR_DESC_PRIV_CAP_TKIP))) {
527 				ret = -EOPNOTSUPP;
528 				goto out_unlock;
529 			}
530 			key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
531 			algo = P54_CRYPTO_TKIPMICHAEL;
532 			break;
533 		case WLAN_CIPHER_SUITE_WEP40:
534 		case WLAN_CIPHER_SUITE_WEP104:
535 			if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
536 				ret = -EOPNOTSUPP;
537 				goto out_unlock;
538 			}
539 			key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
540 			algo = P54_CRYPTO_WEP;
541 			break;
542 		case WLAN_CIPHER_SUITE_CCMP:
543 			if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
544 				ret = -EOPNOTSUPP;
545 				goto out_unlock;
546 			}
547 			key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
548 			algo = P54_CRYPTO_AESCCMP;
549 			break;
550 		default:
551 			ret = -EOPNOTSUPP;
552 			goto out_unlock;
553 		}
554 		slot = bitmap_find_free_region(priv->used_rxkeys,
555 					       priv->rx_keycache_size, 0);
556 
557 		if (slot < 0) {
558 			/*
559 			 * The device supports the chosen algorithm, but the
560 			 * firmware does not provide enough key slots to store
561 			 * all of them.
562 			 * But encryption offload for outgoing frames is always
563 			 * possible, so we just pretend that the upload was
564 			 * successful and do the decryption in software.
565 			 */
566 
567 			/* mark the key as invalid. */
568 			key->hw_key_idx = 0xff;
569 			goto out_unlock;
570 		}
571 
572 		key->flags |= IEEE80211_KEY_FLAG_RESERVE_TAILROOM;
573 	} else {
574 		slot = key->hw_key_idx;
575 
576 		if (slot == 0xff) {
577 			/* This key was not uploaded into the rx key cache. */
578 
579 			goto out_unlock;
580 		}
581 
582 		bitmap_release_region(priv->used_rxkeys, slot, 0);
583 		algo = 0;
584 	}
585 
586 	if (sta)
587 		addr = sta->addr;
588 
589 	ret = p54_upload_key(priv, algo, slot, key->keyidx,
590 			     key->keylen, addr, key->key);
591 	if (ret) {
592 		bitmap_release_region(priv->used_rxkeys, slot, 0);
593 		ret = -EOPNOTSUPP;
594 		goto out_unlock;
595 	}
596 
597 	key->hw_key_idx = slot;
598 
599 out_unlock:
600 	mutex_unlock(&priv->conf_mutex);
601 	return ret;
602 }
603 
p54_get_survey(struct ieee80211_hw * dev,int idx,struct survey_info * survey)604 static int p54_get_survey(struct ieee80211_hw *dev, int idx,
605 				struct survey_info *survey)
606 {
607 	struct p54_common *priv = dev->priv;
608 	struct ieee80211_channel *chan;
609 	int err, tries;
610 	bool in_use = false;
611 
612 	if (idx >= priv->chan_num)
613 		return -ENOENT;
614 
615 #define MAX_TRIES 1
616 	for (tries = 0; tries < MAX_TRIES; tries++) {
617 		chan = priv->curchan;
618 		if (chan && chan->hw_value == idx) {
619 			mutex_lock(&priv->conf_mutex);
620 			err = p54_wait_for_stats(dev);
621 			mutex_unlock(&priv->conf_mutex);
622 			if (err)
623 				return err;
624 
625 			in_use = true;
626 		}
627 
628 		memcpy(survey, &priv->survey[idx], sizeof(*survey));
629 
630 		if (in_use) {
631 			/* test if the reported statistics are valid. */
632 			if  (survey->time != 0) {
633 				survey->filled |= SURVEY_INFO_IN_USE;
634 			} else {
635 				/*
636 				 * hw/fw has not accumulated enough sample sets.
637 				 * Wait for 100ms, this ought to be enough to
638 				 * get at least one non-null set of channel
639 				 * usage statistics.
640 				 */
641 				msleep(100);
642 				continue;
643 			}
644 		}
645 		return 0;
646 	}
647 	return -ETIMEDOUT;
648 #undef MAX_TRIES
649 }
650 
p54_flush_count(struct p54_common * priv)651 static unsigned int p54_flush_count(struct p54_common *priv)
652 {
653 	unsigned int total = 0, i;
654 
655 	BUILD_BUG_ON(P54_QUEUE_NUM > ARRAY_SIZE(priv->tx_stats));
656 
657 	/*
658 	 * Because the firmware has the sole control over any frames
659 	 * in the P54_QUEUE_BEACON or P54_QUEUE_SCAN queues, they
660 	 * don't really count as pending or active.
661 	 */
662 	for (i = P54_QUEUE_MGMT; i < P54_QUEUE_NUM; i++)
663 		total += priv->tx_stats[i].len;
664 	return total;
665 }
666 
p54_flush(struct ieee80211_hw * dev,struct ieee80211_vif * vif,u32 queues,bool drop)667 static void p54_flush(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
668 		      u32 queues, bool drop)
669 {
670 	struct p54_common *priv = dev->priv;
671 	unsigned int total, i;
672 
673 	/*
674 	 * Currently, it wouldn't really matter if we wait for one second
675 	 * or 15 minutes. But once someone gets around and completes the
676 	 * TODOs [ancel stuck frames / reset device] in p54_work, it will
677 	 * suddenly make sense to wait that long.
678 	 */
679 	i = P54_STATISTICS_UPDATE * 2 / 20;
680 
681 	/*
682 	 * In this case no locking is required because as we speak the
683 	 * queues have already been stopped and no new frames can sneak
684 	 * up from behind.
685 	 */
686 	while ((total = p54_flush_count(priv)) && i--) {
687 		/* waste time */
688 		msleep(20);
689 	}
690 
691 	WARN(total, "tx flush timeout, unresponsive firmware");
692 }
693 
p54_set_coverage_class(struct ieee80211_hw * dev,s16 coverage_class)694 static void p54_set_coverage_class(struct ieee80211_hw *dev,
695 				   s16 coverage_class)
696 {
697 	struct p54_common *priv = dev->priv;
698 
699 	mutex_lock(&priv->conf_mutex);
700 	/* support all coverage class values as in 802.11-2007 Table 7-27 */
701 	priv->coverage_class = clamp_t(u8, coverage_class, 0, 31);
702 	p54_set_edcf(priv);
703 	mutex_unlock(&priv->conf_mutex);
704 }
705 
706 static const struct ieee80211_ops p54_ops = {
707 	.tx			= p54_tx_80211,
708 	.wake_tx_queue		= ieee80211_handle_wake_tx_queue,
709 	.start			= p54_start,
710 	.stop			= p54_stop,
711 	.add_interface		= p54_add_interface,
712 	.remove_interface	= p54_remove_interface,
713 	.set_tim		= p54_set_tim,
714 	.sta_notify		= p54_sta_notify,
715 	.sta_add		= p54_sta_add_remove,
716 	.sta_remove		= p54_sta_add_remove,
717 	.set_key		= p54_set_key,
718 	.config			= p54_config,
719 	.flush			= p54_flush,
720 	.bss_info_changed	= p54_bss_info_changed,
721 	.prepare_multicast	= p54_prepare_multicast,
722 	.configure_filter	= p54_configure_filter,
723 	.conf_tx		= p54_conf_tx,
724 	.get_stats		= p54_get_stats,
725 	.get_survey		= p54_get_survey,
726 	.set_coverage_class	= p54_set_coverage_class,
727 };
728 
p54_init_common(size_t priv_data_len)729 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
730 {
731 	struct ieee80211_hw *dev;
732 	struct p54_common *priv;
733 
734 	dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
735 	if (!dev)
736 		return NULL;
737 
738 	priv = dev->priv;
739 	priv->hw = dev;
740 	priv->mode = NL80211_IFTYPE_UNSPECIFIED;
741 	priv->basic_rate_mask = 0x15f;
742 	spin_lock_init(&priv->tx_stats_lock);
743 	skb_queue_head_init(&priv->tx_queue);
744 	skb_queue_head_init(&priv->tx_pending);
745 	ieee80211_hw_set(dev, REPORTS_TX_ACK_STATUS);
746 	ieee80211_hw_set(dev, MFP_CAPABLE);
747 	ieee80211_hw_set(dev, PS_NULLFUNC_STACK);
748 	ieee80211_hw_set(dev, SUPPORTS_PS);
749 	ieee80211_hw_set(dev, RX_INCLUDES_FCS);
750 	ieee80211_hw_set(dev, SIGNAL_DBM);
751 
752 	dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
753 				      BIT(NL80211_IFTYPE_ADHOC) |
754 				      BIT(NL80211_IFTYPE_AP) |
755 				      BIT(NL80211_IFTYPE_MESH_POINT);
756 
757 	priv->beacon_req_id = cpu_to_le32(0);
758 	priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
759 	priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
760 	priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
761 	priv->tx_stats[P54_QUEUE_CAB].limit = 3;
762 	priv->tx_stats[P54_QUEUE_DATA].limit = 5;
763 	dev->queues = 1;
764 	priv->noise = -94;
765 	/*
766 	 * We support at most 8 tries no matter which rate they're at,
767 	 * we cannot support max_rates * max_rate_tries as we set it
768 	 * here, but setting it correctly to 4/2 or so would limit us
769 	 * artificially if the RC algorithm wants just two rates, so
770 	 * let's say 4/7, we'll redistribute it at TX time, see the
771 	 * comments there.
772 	 */
773 	dev->max_rates = 4;
774 	dev->max_rate_tries = 7;
775 	dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
776 				 sizeof(struct p54_tx_data);
777 
778 	/*
779 	 * For now, disable PS by default because it affects
780 	 * link stability significantly.
781 	 */
782 	dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
783 
784 	mutex_init(&priv->conf_mutex);
785 	mutex_init(&priv->eeprom_mutex);
786 	init_completion(&priv->stat_comp);
787 	init_completion(&priv->eeprom_comp);
788 	init_completion(&priv->beacon_comp);
789 	INIT_DELAYED_WORK(&priv->work, p54_work);
790 
791 	eth_broadcast_addr(priv->mc_maclist[0]);
792 	priv->curchan = NULL;
793 	p54_reset_stats(priv);
794 	return dev;
795 }
796 EXPORT_SYMBOL_GPL(p54_init_common);
797 
p54_register_common(struct ieee80211_hw * dev,struct device * pdev)798 int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
799 {
800 	struct p54_common __maybe_unused *priv = dev->priv;
801 	int err;
802 
803 	err = ieee80211_register_hw(dev);
804 	if (err) {
805 		dev_err(pdev, "Cannot register device (%d).\n", err);
806 		return err;
807 	}
808 	priv->registered = true;
809 
810 #ifdef CONFIG_P54_LEDS
811 	err = p54_init_leds(priv);
812 	if (err) {
813 		p54_unregister_common(dev);
814 		return err;
815 	}
816 #endif /* CONFIG_P54_LEDS */
817 
818 	dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
819 	return 0;
820 }
821 EXPORT_SYMBOL_GPL(p54_register_common);
822 
p54_free_common(struct ieee80211_hw * dev)823 void p54_free_common(struct ieee80211_hw *dev)
824 {
825 	struct p54_common *priv = dev->priv;
826 	unsigned int i;
827 
828 	for (i = 0; i < NUM_NL80211_BANDS; i++)
829 		kfree(priv->band_table[i]);
830 
831 	kfree(priv->iq_autocal);
832 	kfree(priv->output_limit);
833 	kfree(priv->curve_data);
834 	kfree(priv->rssi_db);
835 	bitmap_free(priv->used_rxkeys);
836 	kfree(priv->survey);
837 	priv->iq_autocal = NULL;
838 	priv->output_limit = NULL;
839 	priv->curve_data = NULL;
840 	priv->rssi_db = NULL;
841 	priv->used_rxkeys = NULL;
842 	priv->survey = NULL;
843 	ieee80211_free_hw(dev);
844 }
845 EXPORT_SYMBOL_GPL(p54_free_common);
846 
p54_unregister_common(struct ieee80211_hw * dev)847 void p54_unregister_common(struct ieee80211_hw *dev)
848 {
849 	struct p54_common *priv = dev->priv;
850 
851 	if (priv->registered) {
852 		priv->registered = false;
853 #ifdef CONFIG_P54_LEDS
854 		p54_unregister_leds(priv);
855 #endif /* CONFIG_P54_LEDS */
856 		ieee80211_unregister_hw(dev);
857 	}
858 
859 	mutex_destroy(&priv->conf_mutex);
860 	mutex_destroy(&priv->eeprom_mutex);
861 }
862 EXPORT_SYMBOL_GPL(p54_unregister_common);
863