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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
26static bool modparam_nohwcrypt;
27module_param_named(nohwcrypt, modparam_nohwcrypt, bool, 0444);
28MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
29MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
30MODULE_DESCRIPTION("Softmac Prism54 common code");
31MODULE_LICENSE("GPL");
32MODULE_ALIAS("prism54common");
33
34static 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
50static 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
66static 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
74u8 *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
96static 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
135static 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
165static 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
195out:
196 mutex_unlock(&priv->conf_mutex);
197 return err;
198}
199
200static 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
223static 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
257static 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
280static 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
297static 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
316static 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
358out:
359 mutex_unlock(&priv->conf_mutex);
360 return ret;
361}
362
363static 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
388static 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
406static 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
422static 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
441static 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
450static 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
498static 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
599out_unlock:
600 mutex_unlock(&priv->conf_mutex);
601 return ret;
602}
603
604static 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
651static 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
667static 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
694static 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
706static 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
729struct 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}
796EXPORT_SYMBOL_GPL(p54_init_common);
797
798int 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}
821EXPORT_SYMBOL_GPL(p54_register_common);
822
823void 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}
845EXPORT_SYMBOL_GPL(p54_free_common);
846
847void 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}
862EXPORT_SYMBOL_GPL(p54_unregister_common);
1/*
2 * mac80211 glue code for mac80211 Prism54 drivers
3 *
4 * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
5 * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
6 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
7 *
8 * Based on:
9 * - the islsm (softmac prism54) driver, which is:
10 * Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
11 * - stlc45xx driver
12 * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
17 */
18
19#include <linux/slab.h>
20#include <linux/firmware.h>
21#include <linux/etherdevice.h>
22#include <linux/module.h>
23
24#include <net/mac80211.h>
25
26#include "p54.h"
27#include "lmac.h"
28
29static bool modparam_nohwcrypt;
30module_param_named(nohwcrypt, modparam_nohwcrypt, bool, S_IRUGO);
31MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
32MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
33MODULE_DESCRIPTION("Softmac Prism54 common code");
34MODULE_LICENSE("GPL");
35MODULE_ALIAS("prism54common");
36
37static int p54_sta_add_remove(struct ieee80211_hw *hw,
38 struct ieee80211_vif *vif,
39 struct ieee80211_sta *sta)
40{
41 struct p54_common *priv = hw->priv;
42
43 /*
44 * Notify the firmware that we don't want or we don't
45 * need to buffer frames for this station anymore.
46 */
47
48 p54_sta_unlock(priv, sta->addr);
49
50 return 0;
51}
52
53static void p54_sta_notify(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
54 enum sta_notify_cmd notify_cmd,
55 struct ieee80211_sta *sta)
56{
57 struct p54_common *priv = dev->priv;
58
59 switch (notify_cmd) {
60 case STA_NOTIFY_AWAKE:
61 /* update the firmware's filter table */
62 p54_sta_unlock(priv, sta->addr);
63 break;
64 default:
65 break;
66 }
67}
68
69static int p54_set_tim(struct ieee80211_hw *dev, struct ieee80211_sta *sta,
70 bool set)
71{
72 struct p54_common *priv = dev->priv;
73
74 return p54_update_beacon_tim(priv, sta->aid, set);
75}
76
77u8 *p54_find_ie(struct sk_buff *skb, u8 ie)
78{
79 struct ieee80211_mgmt *mgmt = (void *)skb->data;
80 u8 *pos, *end;
81
82 if (skb->len <= sizeof(mgmt))
83 return NULL;
84
85 pos = (u8 *)mgmt->u.beacon.variable;
86 end = skb->data + skb->len;
87 while (pos < end) {
88 if (pos + 2 + pos[1] > end)
89 return NULL;
90
91 if (pos[0] == ie)
92 return pos;
93
94 pos += 2 + pos[1];
95 }
96 return NULL;
97}
98
99static int p54_beacon_format_ie_tim(struct sk_buff *skb)
100{
101 /*
102 * the good excuse for this mess is ... the firmware.
103 * The dummy TIM MUST be at the end of the beacon frame,
104 * because it'll be overwritten!
105 */
106 u8 *tim;
107 u8 dtim_len;
108 u8 dtim_period;
109 u8 *next;
110
111 tim = p54_find_ie(skb, WLAN_EID_TIM);
112 if (!tim)
113 return 0;
114
115 dtim_len = tim[1];
116 dtim_period = tim[3];
117 next = tim + 2 + dtim_len;
118
119 if (dtim_len < 3)
120 return -EINVAL;
121
122 memmove(tim, next, skb_tail_pointer(skb) - next);
123 tim = skb_tail_pointer(skb) - (dtim_len + 2);
124
125 /* add the dummy at the end */
126 tim[0] = WLAN_EID_TIM;
127 tim[1] = 3;
128 tim[2] = 0;
129 tim[3] = dtim_period;
130 tim[4] = 0;
131
132 if (dtim_len > 3)
133 skb_trim(skb, skb->len - (dtim_len - 3));
134
135 return 0;
136}
137
138static int p54_beacon_update(struct p54_common *priv,
139 struct ieee80211_vif *vif)
140{
141 struct ieee80211_tx_control control = { };
142 struct sk_buff *beacon;
143 int ret;
144
145 beacon = ieee80211_beacon_get(priv->hw, vif);
146 if (!beacon)
147 return -ENOMEM;
148 ret = p54_beacon_format_ie_tim(beacon);
149 if (ret)
150 return ret;
151
152 /*
153 * During operation, the firmware takes care of beaconing.
154 * The driver only needs to upload a new beacon template, once
155 * the template was changed by the stack or userspace.
156 *
157 * LMAC API 3.2.2 also specifies that the driver does not need
158 * to cancel the old beacon template by hand, instead the firmware
159 * will release the previous one through the feedback mechanism.
160 */
161 p54_tx_80211(priv->hw, &control, beacon);
162 priv->tsf_high32 = 0;
163 priv->tsf_low32 = 0;
164
165 return 0;
166}
167
168static int p54_start(struct ieee80211_hw *dev)
169{
170 struct p54_common *priv = dev->priv;
171 int err;
172
173 mutex_lock(&priv->conf_mutex);
174 err = priv->open(dev);
175 if (err)
176 goto out;
177 P54_SET_QUEUE(priv->qos_params[0], 0x0002, 0x0003, 0x0007, 47);
178 P54_SET_QUEUE(priv->qos_params[1], 0x0002, 0x0007, 0x000f, 94);
179 P54_SET_QUEUE(priv->qos_params[2], 0x0003, 0x000f, 0x03ff, 0);
180 P54_SET_QUEUE(priv->qos_params[3], 0x0007, 0x000f, 0x03ff, 0);
181 err = p54_set_edcf(priv);
182 if (err)
183 goto out;
184
185 eth_broadcast_addr(priv->bssid);
186 priv->mode = NL80211_IFTYPE_MONITOR;
187 err = p54_setup_mac(priv);
188 if (err) {
189 priv->mode = NL80211_IFTYPE_UNSPECIFIED;
190 goto out;
191 }
192
193 ieee80211_queue_delayed_work(dev, &priv->work, 0);
194
195 priv->softled_state = 0;
196 err = p54_set_leds(priv);
197
198out:
199 mutex_unlock(&priv->conf_mutex);
200 return err;
201}
202
203static void p54_stop(struct ieee80211_hw *dev)
204{
205 struct p54_common *priv = dev->priv;
206 int i;
207
208 priv->mode = NL80211_IFTYPE_UNSPECIFIED;
209 priv->softled_state = 0;
210 cancel_delayed_work_sync(&priv->work);
211 mutex_lock(&priv->conf_mutex);
212 p54_set_leds(priv);
213 priv->stop(dev);
214 skb_queue_purge(&priv->tx_pending);
215 skb_queue_purge(&priv->tx_queue);
216 for (i = 0; i < P54_QUEUE_NUM; i++) {
217 priv->tx_stats[i].count = 0;
218 priv->tx_stats[i].len = 0;
219 }
220
221 priv->beacon_req_id = cpu_to_le32(0);
222 priv->tsf_high32 = priv->tsf_low32 = 0;
223 mutex_unlock(&priv->conf_mutex);
224}
225
226static int p54_add_interface(struct ieee80211_hw *dev,
227 struct ieee80211_vif *vif)
228{
229 struct p54_common *priv = dev->priv;
230 int err;
231
232 vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER;
233
234 mutex_lock(&priv->conf_mutex);
235 if (priv->mode != NL80211_IFTYPE_MONITOR) {
236 mutex_unlock(&priv->conf_mutex);
237 return -EOPNOTSUPP;
238 }
239
240 priv->vif = vif;
241
242 switch (vif->type) {
243 case NL80211_IFTYPE_STATION:
244 case NL80211_IFTYPE_ADHOC:
245 case NL80211_IFTYPE_AP:
246 case NL80211_IFTYPE_MESH_POINT:
247 priv->mode = vif->type;
248 break;
249 default:
250 mutex_unlock(&priv->conf_mutex);
251 return -EOPNOTSUPP;
252 }
253
254 memcpy(priv->mac_addr, vif->addr, ETH_ALEN);
255 err = p54_setup_mac(priv);
256 mutex_unlock(&priv->conf_mutex);
257 return err;
258}
259
260static void p54_remove_interface(struct ieee80211_hw *dev,
261 struct ieee80211_vif *vif)
262{
263 struct p54_common *priv = dev->priv;
264
265 mutex_lock(&priv->conf_mutex);
266 priv->vif = NULL;
267
268 /*
269 * LMAC API 3.2.2 states that any active beacon template must be
270 * canceled by the driver before attempting a mode transition.
271 */
272 if (le32_to_cpu(priv->beacon_req_id) != 0) {
273 p54_tx_cancel(priv, priv->beacon_req_id);
274 wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ);
275 }
276 priv->mode = NL80211_IFTYPE_MONITOR;
277 eth_zero_addr(priv->mac_addr);
278 eth_zero_addr(priv->bssid);
279 p54_setup_mac(priv);
280 mutex_unlock(&priv->conf_mutex);
281}
282
283static int p54_wait_for_stats(struct ieee80211_hw *dev)
284{
285 struct p54_common *priv = dev->priv;
286 int ret;
287
288 priv->update_stats = true;
289 ret = p54_fetch_statistics(priv);
290 if (ret)
291 return ret;
292
293 ret = wait_for_completion_interruptible_timeout(&priv->stat_comp, HZ);
294 if (ret == 0)
295 return -ETIMEDOUT;
296
297 return 0;
298}
299
300static void p54_reset_stats(struct p54_common *priv)
301{
302 struct ieee80211_channel *chan = priv->curchan;
303
304 if (chan) {
305 struct survey_info *info = &priv->survey[chan->hw_value];
306
307 /* only reset channel statistics, don't touch .filled, etc. */
308 info->time = 0;
309 info->time_busy = 0;
310 info->time_tx = 0;
311 }
312
313 priv->update_stats = true;
314 priv->survey_raw.active = 0;
315 priv->survey_raw.cca = 0;
316 priv->survey_raw.tx = 0;
317}
318
319static int p54_config(struct ieee80211_hw *dev, u32 changed)
320{
321 int ret = 0;
322 struct p54_common *priv = dev->priv;
323 struct ieee80211_conf *conf = &dev->conf;
324
325 mutex_lock(&priv->conf_mutex);
326 if (changed & IEEE80211_CONF_CHANGE_POWER)
327 priv->output_power = conf->power_level << 2;
328 if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
329 struct ieee80211_channel *oldchan;
330 WARN_ON(p54_wait_for_stats(dev));
331 oldchan = priv->curchan;
332 priv->curchan = NULL;
333 ret = p54_scan(priv, P54_SCAN_EXIT, 0);
334 if (ret) {
335 priv->curchan = oldchan;
336 goto out;
337 }
338 /*
339 * TODO: Use the LM_SCAN_TRAP to determine the current
340 * operating channel.
341 */
342 priv->curchan = priv->hw->conf.chandef.chan;
343 p54_reset_stats(priv);
344 WARN_ON(p54_fetch_statistics(priv));
345 }
346 if (changed & IEEE80211_CONF_CHANGE_PS) {
347 WARN_ON(p54_wait_for_stats(dev));
348 ret = p54_set_ps(priv);
349 if (ret)
350 goto out;
351 WARN_ON(p54_wait_for_stats(dev));
352 }
353 if (changed & IEEE80211_CONF_CHANGE_IDLE) {
354 WARN_ON(p54_wait_for_stats(dev));
355 ret = p54_setup_mac(priv);
356 if (ret)
357 goto out;
358 WARN_ON(p54_wait_for_stats(dev));
359 }
360
361out:
362 mutex_unlock(&priv->conf_mutex);
363 return ret;
364}
365
366static u64 p54_prepare_multicast(struct ieee80211_hw *dev,
367 struct netdev_hw_addr_list *mc_list)
368{
369 struct p54_common *priv = dev->priv;
370 struct netdev_hw_addr *ha;
371 int i;
372
373 BUILD_BUG_ON(ARRAY_SIZE(priv->mc_maclist) !=
374 ARRAY_SIZE(((struct p54_group_address_table *)NULL)->mac_list));
375 /*
376 * The first entry is reserved for the global broadcast MAC.
377 * Otherwise the firmware will drop it and ARP will no longer work.
378 */
379 i = 1;
380 priv->mc_maclist_num = netdev_hw_addr_list_count(mc_list) + i;
381 netdev_hw_addr_list_for_each(ha, mc_list) {
382 memcpy(&priv->mc_maclist[i], ha->addr, ETH_ALEN);
383 i++;
384 if (i >= ARRAY_SIZE(priv->mc_maclist))
385 break;
386 }
387
388 return 1; /* update */
389}
390
391static void p54_configure_filter(struct ieee80211_hw *dev,
392 unsigned int changed_flags,
393 unsigned int *total_flags,
394 u64 multicast)
395{
396 struct p54_common *priv = dev->priv;
397
398 *total_flags &= FIF_ALLMULTI | FIF_OTHER_BSS;
399
400 priv->filter_flags = *total_flags;
401
402 if (changed_flags & FIF_OTHER_BSS)
403 p54_setup_mac(priv);
404
405 if (changed_flags & FIF_ALLMULTI || multicast)
406 p54_set_groupfilter(priv);
407}
408
409static int p54_conf_tx(struct ieee80211_hw *dev,
410 struct ieee80211_vif *vif, u16 queue,
411 const struct ieee80211_tx_queue_params *params)
412{
413 struct p54_common *priv = dev->priv;
414 int ret;
415
416 mutex_lock(&priv->conf_mutex);
417 if (queue < dev->queues) {
418 P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
419 params->cw_min, params->cw_max, params->txop);
420 ret = p54_set_edcf(priv);
421 } else
422 ret = -EINVAL;
423 mutex_unlock(&priv->conf_mutex);
424 return ret;
425}
426
427static void p54_work(struct work_struct *work)
428{
429 struct p54_common *priv = container_of(work, struct p54_common,
430 work.work);
431
432 if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
433 return ;
434
435 /*
436 * TODO: walk through tx_queue and do the following tasks
437 * 1. initiate bursts.
438 * 2. cancel stuck frames / reset the device if necessary.
439 */
440
441 mutex_lock(&priv->conf_mutex);
442 WARN_ON_ONCE(p54_fetch_statistics(priv));
443 mutex_unlock(&priv->conf_mutex);
444}
445
446static int p54_get_stats(struct ieee80211_hw *dev,
447 struct ieee80211_low_level_stats *stats)
448{
449 struct p54_common *priv = dev->priv;
450
451 memcpy(stats, &priv->stats, sizeof(*stats));
452 return 0;
453}
454
455static void p54_bss_info_changed(struct ieee80211_hw *dev,
456 struct ieee80211_vif *vif,
457 struct ieee80211_bss_conf *info,
458 u32 changed)
459{
460 struct p54_common *priv = dev->priv;
461
462 mutex_lock(&priv->conf_mutex);
463 if (changed & BSS_CHANGED_BSSID) {
464 memcpy(priv->bssid, info->bssid, ETH_ALEN);
465 p54_setup_mac(priv);
466 }
467
468 if (changed & BSS_CHANGED_BEACON) {
469 p54_scan(priv, P54_SCAN_EXIT, 0);
470 p54_setup_mac(priv);
471 p54_beacon_update(priv, vif);
472 p54_set_edcf(priv);
473 }
474
475 if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
476 priv->use_short_slot = info->use_short_slot;
477 p54_set_edcf(priv);
478 }
479 if (changed & BSS_CHANGED_BASIC_RATES) {
480 if (dev->conf.chandef.chan->band == IEEE80211_BAND_5GHZ)
481 priv->basic_rate_mask = (info->basic_rates << 4);
482 else
483 priv->basic_rate_mask = info->basic_rates;
484 p54_setup_mac(priv);
485 if (priv->fw_var >= 0x500)
486 p54_scan(priv, P54_SCAN_EXIT, 0);
487 }
488 if (changed & BSS_CHANGED_ASSOC) {
489 if (info->assoc) {
490 priv->aid = info->aid;
491 priv->wakeup_timer = info->beacon_int *
492 info->dtim_period * 5;
493 p54_setup_mac(priv);
494 } else {
495 priv->wakeup_timer = 500;
496 priv->aid = 0;
497 }
498 }
499
500 mutex_unlock(&priv->conf_mutex);
501}
502
503static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
504 struct ieee80211_vif *vif, struct ieee80211_sta *sta,
505 struct ieee80211_key_conf *key)
506{
507 struct p54_common *priv = dev->priv;
508 int slot, ret = 0;
509 u8 algo = 0;
510 u8 *addr = NULL;
511
512 if (modparam_nohwcrypt)
513 return -EOPNOTSUPP;
514
515 if (key->flags & IEEE80211_KEY_FLAG_RX_MGMT) {
516 /*
517 * Unfortunately most/all firmwares are trying to decrypt
518 * incoming management frames if a suitable key can be found.
519 * However, in doing so the data in these frames gets
520 * corrupted. So, we can't have firmware supported crypto
521 * offload in this case.
522 */
523 return -EOPNOTSUPP;
524 }
525
526 mutex_lock(&priv->conf_mutex);
527 if (cmd == SET_KEY) {
528 switch (key->cipher) {
529 case WLAN_CIPHER_SUITE_TKIP:
530 if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
531 BR_DESC_PRIV_CAP_TKIP))) {
532 ret = -EOPNOTSUPP;
533 goto out_unlock;
534 }
535 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
536 algo = P54_CRYPTO_TKIPMICHAEL;
537 break;
538 case WLAN_CIPHER_SUITE_WEP40:
539 case WLAN_CIPHER_SUITE_WEP104:
540 if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
541 ret = -EOPNOTSUPP;
542 goto out_unlock;
543 }
544 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
545 algo = P54_CRYPTO_WEP;
546 break;
547 case WLAN_CIPHER_SUITE_CCMP:
548 if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
549 ret = -EOPNOTSUPP;
550 goto out_unlock;
551 }
552 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
553 algo = P54_CRYPTO_AESCCMP;
554 break;
555 default:
556 ret = -EOPNOTSUPP;
557 goto out_unlock;
558 }
559 slot = bitmap_find_free_region(priv->used_rxkeys,
560 priv->rx_keycache_size, 0);
561
562 if (slot < 0) {
563 /*
564 * The device supports the chosen algorithm, but the
565 * firmware does not provide enough key slots to store
566 * all of them.
567 * But encryption offload for outgoing frames is always
568 * possible, so we just pretend that the upload was
569 * successful and do the decryption in software.
570 */
571
572 /* mark the key as invalid. */
573 key->hw_key_idx = 0xff;
574 goto out_unlock;
575 }
576
577 key->flags |= IEEE80211_KEY_FLAG_RESERVE_TAILROOM;
578 } else {
579 slot = key->hw_key_idx;
580
581 if (slot == 0xff) {
582 /* This key was not uploaded into the rx key cache. */
583
584 goto out_unlock;
585 }
586
587 bitmap_release_region(priv->used_rxkeys, slot, 0);
588 algo = 0;
589 }
590
591 if (sta)
592 addr = sta->addr;
593
594 ret = p54_upload_key(priv, algo, slot, key->keyidx,
595 key->keylen, addr, key->key);
596 if (ret) {
597 bitmap_release_region(priv->used_rxkeys, slot, 0);
598 ret = -EOPNOTSUPP;
599 goto out_unlock;
600 }
601
602 key->hw_key_idx = slot;
603
604out_unlock:
605 mutex_unlock(&priv->conf_mutex);
606 return ret;
607}
608
609static int p54_get_survey(struct ieee80211_hw *dev, int idx,
610 struct survey_info *survey)
611{
612 struct p54_common *priv = dev->priv;
613 struct ieee80211_channel *chan;
614 int err, tries;
615 bool in_use = false;
616
617 if (idx >= priv->chan_num)
618 return -ENOENT;
619
620#define MAX_TRIES 1
621 for (tries = 0; tries < MAX_TRIES; tries++) {
622 chan = priv->curchan;
623 if (chan && chan->hw_value == idx) {
624 mutex_lock(&priv->conf_mutex);
625 err = p54_wait_for_stats(dev);
626 mutex_unlock(&priv->conf_mutex);
627 if (err)
628 return err;
629
630 in_use = true;
631 }
632
633 memcpy(survey, &priv->survey[idx], sizeof(*survey));
634
635 if (in_use) {
636 /* test if the reported statistics are valid. */
637 if (survey->time != 0) {
638 survey->filled |= SURVEY_INFO_IN_USE;
639 } else {
640 /*
641 * hw/fw has not accumulated enough sample sets.
642 * Wait for 100ms, this ought to be enough to
643 * to get at least one non-null set of channel
644 * usage statistics.
645 */
646 msleep(100);
647 continue;
648 }
649 }
650 return 0;
651 }
652 return -ETIMEDOUT;
653#undef MAX_TRIES
654}
655
656static unsigned int p54_flush_count(struct p54_common *priv)
657{
658 unsigned int total = 0, i;
659
660 BUILD_BUG_ON(P54_QUEUE_NUM > ARRAY_SIZE(priv->tx_stats));
661
662 /*
663 * Because the firmware has the sole control over any frames
664 * in the P54_QUEUE_BEACON or P54_QUEUE_SCAN queues, they
665 * don't really count as pending or active.
666 */
667 for (i = P54_QUEUE_MGMT; i < P54_QUEUE_NUM; i++)
668 total += priv->tx_stats[i].len;
669 return total;
670}
671
672static void p54_flush(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
673 u32 queues, bool drop)
674{
675 struct p54_common *priv = dev->priv;
676 unsigned int total, i;
677
678 /*
679 * Currently, it wouldn't really matter if we wait for one second
680 * or 15 minutes. But once someone gets around and completes the
681 * TODOs [ancel stuck frames / reset device] in p54_work, it will
682 * suddenly make sense to wait that long.
683 */
684 i = P54_STATISTICS_UPDATE * 2 / 20;
685
686 /*
687 * In this case no locking is required because as we speak the
688 * queues have already been stopped and no new frames can sneak
689 * up from behind.
690 */
691 while ((total = p54_flush_count(priv) && i--)) {
692 /* waste time */
693 msleep(20);
694 }
695
696 WARN(total, "tx flush timeout, unresponsive firmware");
697}
698
699static void p54_set_coverage_class(struct ieee80211_hw *dev,
700 s16 coverage_class)
701{
702 struct p54_common *priv = dev->priv;
703
704 mutex_lock(&priv->conf_mutex);
705 /* support all coverage class values as in 802.11-2007 Table 7-27 */
706 priv->coverage_class = clamp_t(u8, coverage_class, 0, 31);
707 p54_set_edcf(priv);
708 mutex_unlock(&priv->conf_mutex);
709}
710
711static const struct ieee80211_ops p54_ops = {
712 .tx = p54_tx_80211,
713 .start = p54_start,
714 .stop = p54_stop,
715 .add_interface = p54_add_interface,
716 .remove_interface = p54_remove_interface,
717 .set_tim = p54_set_tim,
718 .sta_notify = p54_sta_notify,
719 .sta_add = p54_sta_add_remove,
720 .sta_remove = p54_sta_add_remove,
721 .set_key = p54_set_key,
722 .config = p54_config,
723 .flush = p54_flush,
724 .bss_info_changed = p54_bss_info_changed,
725 .prepare_multicast = p54_prepare_multicast,
726 .configure_filter = p54_configure_filter,
727 .conf_tx = p54_conf_tx,
728 .get_stats = p54_get_stats,
729 .get_survey = p54_get_survey,
730 .set_coverage_class = p54_set_coverage_class,
731};
732
733struct ieee80211_hw *p54_init_common(size_t priv_data_len)
734{
735 struct ieee80211_hw *dev;
736 struct p54_common *priv;
737
738 dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
739 if (!dev)
740 return NULL;
741
742 priv = dev->priv;
743 priv->hw = dev;
744 priv->mode = NL80211_IFTYPE_UNSPECIFIED;
745 priv->basic_rate_mask = 0x15f;
746 spin_lock_init(&priv->tx_stats_lock);
747 skb_queue_head_init(&priv->tx_queue);
748 skb_queue_head_init(&priv->tx_pending);
749 ieee80211_hw_set(dev, REPORTS_TX_ACK_STATUS);
750 ieee80211_hw_set(dev, MFP_CAPABLE);
751 ieee80211_hw_set(dev, PS_NULLFUNC_STACK);
752 ieee80211_hw_set(dev, SUPPORTS_PS);
753 ieee80211_hw_set(dev, RX_INCLUDES_FCS);
754 ieee80211_hw_set(dev, SIGNAL_DBM);
755
756 dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
757 BIT(NL80211_IFTYPE_ADHOC) |
758 BIT(NL80211_IFTYPE_AP) |
759 BIT(NL80211_IFTYPE_MESH_POINT);
760
761 priv->beacon_req_id = cpu_to_le32(0);
762 priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
763 priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
764 priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
765 priv->tx_stats[P54_QUEUE_CAB].limit = 3;
766 priv->tx_stats[P54_QUEUE_DATA].limit = 5;
767 dev->queues = 1;
768 priv->noise = -94;
769 /*
770 * We support at most 8 tries no matter which rate they're at,
771 * we cannot support max_rates * max_rate_tries as we set it
772 * here, but setting it correctly to 4/2 or so would limit us
773 * artificially if the RC algorithm wants just two rates, so
774 * let's say 4/7, we'll redistribute it at TX time, see the
775 * comments there.
776 */
777 dev->max_rates = 4;
778 dev->max_rate_tries = 7;
779 dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
780 sizeof(struct p54_tx_data);
781
782 /*
783 * For now, disable PS by default because it affects
784 * link stability significantly.
785 */
786 dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
787
788 mutex_init(&priv->conf_mutex);
789 mutex_init(&priv->eeprom_mutex);
790 init_completion(&priv->stat_comp);
791 init_completion(&priv->eeprom_comp);
792 init_completion(&priv->beacon_comp);
793 INIT_DELAYED_WORK(&priv->work, p54_work);
794
795 eth_broadcast_addr(priv->mc_maclist[0]);
796 priv->curchan = NULL;
797 p54_reset_stats(priv);
798 return dev;
799}
800EXPORT_SYMBOL_GPL(p54_init_common);
801
802int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
803{
804 struct p54_common __maybe_unused *priv = dev->priv;
805 int err;
806
807 err = ieee80211_register_hw(dev);
808 if (err) {
809 dev_err(pdev, "Cannot register device (%d).\n", err);
810 return err;
811 }
812 priv->registered = true;
813
814#ifdef CONFIG_P54_LEDS
815 err = p54_init_leds(priv);
816 if (err) {
817 p54_unregister_common(dev);
818 return err;
819 }
820#endif /* CONFIG_P54_LEDS */
821
822 dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
823 return 0;
824}
825EXPORT_SYMBOL_GPL(p54_register_common);
826
827void p54_free_common(struct ieee80211_hw *dev)
828{
829 struct p54_common *priv = dev->priv;
830 unsigned int i;
831
832 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
833 kfree(priv->band_table[i]);
834
835 kfree(priv->iq_autocal);
836 kfree(priv->output_limit);
837 kfree(priv->curve_data);
838 kfree(priv->rssi_db);
839 kfree(priv->used_rxkeys);
840 kfree(priv->survey);
841 priv->iq_autocal = NULL;
842 priv->output_limit = NULL;
843 priv->curve_data = NULL;
844 priv->rssi_db = NULL;
845 priv->used_rxkeys = NULL;
846 priv->survey = NULL;
847 ieee80211_free_hw(dev);
848}
849EXPORT_SYMBOL_GPL(p54_free_common);
850
851void p54_unregister_common(struct ieee80211_hw *dev)
852{
853 struct p54_common *priv = dev->priv;
854
855#ifdef CONFIG_P54_LEDS
856 p54_unregister_leds(priv);
857#endif /* CONFIG_P54_LEDS */
858
859 if (priv->registered) {
860 priv->registered = false;
861 ieee80211_unregister_hw(dev);
862 }
863
864 mutex_destroy(&priv->conf_mutex);
865 mutex_destroy(&priv->eeprom_mutex);
866}
867EXPORT_SYMBOL_GPL(p54_unregister_common);