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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / drivers / net / wireless / st / cw1200 / txrx.c
blob400dd585916b5c0ab3037d4ecfeb2ce890a71b7c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Datapath 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 <net/mac80211.h>
10 #include <linux/etherdevice.h>
11 #include <linux/skbuff.h>
12
13 #include "cw1200.h"
14 #include "wsm.h"
15 #include "bh.h"
16 #include "sta.h"
17 #include "debug.h"
18
19 #define CW1200_INVALID_RATE_ID (0xFF)
20
21 static int cw1200_handle_action_rx(struct cw1200_common *priv,
22 struct sk_buff *skb);
23 static const struct ieee80211_rate *
24 cw1200_get_tx_rate(const struct cw1200_common *priv,
25 const struct ieee80211_tx_rate *rate);
26
27 /* ******************************************************************** */
28 /* TX queue lock / unlock */
29
30 static inline void cw1200_tx_queues_lock(struct cw1200_common *priv)
31 {
32 int i;
33 for (i = 0; i < 4; ++i)
34 cw1200_queue_lock(&priv->tx_queue[i]);
35 }
36
37 static inline void cw1200_tx_queues_unlock(struct cw1200_common *priv)
38 {
39 int i;
40 for (i = 0; i < 4; ++i)
41 cw1200_queue_unlock(&priv->tx_queue[i]);
42 }
43
44 /* ******************************************************************** */
45 /* TX policy cache implementation */
46
47 static void tx_policy_dump(struct tx_policy *policy)
48 {
49 pr_debug("[TX policy] %.1X%.1X%.1X%.1X%.1X%.1X%.1X%.1X %.1X%.1X%.1X%.1X%.1X%.1X%.1X%.1X %.1X%.1X%.1X%.1X%.1X%.1X%.1X%.1X: %d\n",
50 policy->raw[0] & 0x0F, policy->raw[0] >> 4,
51 policy->raw[1] & 0x0F, policy->raw[1] >> 4,
52 policy->raw[2] & 0x0F, policy->raw[2] >> 4,
53 policy->raw[3] & 0x0F, policy->raw[3] >> 4,
54 policy->raw[4] & 0x0F, policy->raw[4] >> 4,
55 policy->raw[5] & 0x0F, policy->raw[5] >> 4,
56 policy->raw[6] & 0x0F, policy->raw[6] >> 4,
57 policy->raw[7] & 0x0F, policy->raw[7] >> 4,
58 policy->raw[8] & 0x0F, policy->raw[8] >> 4,
59 policy->raw[9] & 0x0F, policy->raw[9] >> 4,
60 policy->raw[10] & 0x0F, policy->raw[10] >> 4,
61 policy->raw[11] & 0x0F, policy->raw[11] >> 4,
62 policy->defined);
63 }
64
65 static void tx_policy_build(const struct cw1200_common *priv,
66 /* [out] */ struct tx_policy *policy,
67 struct ieee80211_tx_rate *rates, size_t count)
68 {
69 int i, j;
70 unsigned limit = priv->short_frame_max_tx_count;
71 unsigned total = 0;
72 BUG_ON(rates[0].idx < 0);
73 memset(policy, 0, sizeof(*policy));
74
75 /* Sort rates in descending order. */
76 for (i = 1; i < count; ++i) {
77 if (rates[i].idx < 0) {
78 count = i;
79 break;
80 }
81 if (rates[i].idx > rates[i - 1].idx) {
82 struct ieee80211_tx_rate tmp = rates[i - 1];
83 rates[i - 1] = rates[i];
84 rates[i] = tmp;
85 }
86 }
87
88 /* Eliminate duplicates. */
89 total = rates[0].count;
90 for (i = 0, j = 1; j < count; ++j) {
91 if (rates[j].idx == rates[i].idx) {
92 rates[i].count += rates[j].count;
93 } else if (rates[j].idx > rates[i].idx) {
94 break;
95 } else {
96 ++i;
97 if (i != j)
98 rates[i] = rates[j];
99 }
100 total += rates[j].count;
101 }
102 count = i + 1;
103
104 /* Re-fill policy trying to keep every requested rate and with
105 * respect to the global max tx retransmission count.
106 */
107 if (limit < count)
108 limit = count;
109 if (total > limit) {
110 for (i = 0; i < count; ++i) {
111 int left = count - i - 1;
112 if (rates[i].count > limit - left)
113 rates[i].count = limit - left;
114 limit -= rates[i].count;
115 }
116 }
117
118 /* HACK!!! Device has problems (at least) switching from
119 * 54Mbps CTS to 1Mbps. This switch takes enormous amount
120 * of time (100-200 ms), leading to valuable throughput drop.
121 * As a workaround, additional g-rates are injected to the
122 * policy.
123 */
124 if (count == 2 && !(rates[0].flags & IEEE80211_TX_RC_MCS) &&
125 rates[0].idx > 4 && rates[0].count > 2 &&
126 rates[1].idx < 2) {
127 int mid_rate = (rates[0].idx + 4) >> 1;
128
129 /* Decrease number of retries for the initial rate */
130 rates[0].count -= 2;
131
132 if (mid_rate != 4) {
133 /* Keep fallback rate at 1Mbps. */
134 rates[3] = rates[1];
135
136 /* Inject 1 transmission on lowest g-rate */
137 rates[2].idx = 4;
138 rates[2].count = 1;
139 rates[2].flags = rates[1].flags;
140
141 /* Inject 1 transmission on mid-rate */
142 rates[1].idx = mid_rate;
143 rates[1].count = 1;
144
145 /* Fallback to 1 Mbps is a really bad thing,
146 * so let's try to increase probability of
147 * successful transmission on the lowest g rate
148 * even more
149 */
150 if (rates[0].count >= 3) {
151 --rates[0].count;
152 ++rates[2].count;
153 }
154
155 /* Adjust amount of rates defined */
156 count += 2;
157 } else {
158 /* Keep fallback rate at 1Mbps. */
159 rates[2] = rates[1];
160
161 /* Inject 2 transmissions on lowest g-rate */
162 rates[1].idx = 4;
163 rates[1].count = 2;
164
165 /* Adjust amount of rates defined */
166 count += 1;
167 }
168 }
169
170 policy->defined = cw1200_get_tx_rate(priv, &rates[0])->hw_value + 1;
171
172 for (i = 0; i < count; ++i) {
173 register unsigned rateid, off, shift, retries;
174
175 rateid = cw1200_get_tx_rate(priv, &rates[i])->hw_value;
176 off = rateid >> 3; /* eq. rateid / 8 */
177 shift = (rateid & 0x07) << 2; /* eq. (rateid % 8) * 4 */
178
179 retries = rates[i].count;
180 if (retries > 0x0F) {
181 rates[i].count = 0x0f;
182 retries = 0x0F;
183 }
184 policy->tbl[off] |= __cpu_to_le32(retries << shift);
185 policy->retry_count += retries;
186 }
187
188 pr_debug("[TX policy] Policy (%zu): %d:%d, %d:%d, %d:%d, %d:%d\n",
189 count,
190 rates[0].idx, rates[0].count,
191 rates[1].idx, rates[1].count,
192 rates[2].idx, rates[2].count,
193 rates[3].idx, rates[3].count);
194 }
195
196 static inline bool tx_policy_is_equal(const struct tx_policy *wanted,
197 const struct tx_policy *cached)
198 {
199 size_t count = wanted->defined >> 1;
200 if (wanted->defined > cached->defined)
201 return false;
202 if (count) {
203 if (memcmp(wanted->raw, cached->raw, count))
204 return false;
205 }
206 if (wanted->defined & 1) {
207 if ((wanted->raw[count] & 0x0F) != (cached->raw[count] & 0x0F))
208 return false;
209 }
210 return true;
211 }
212
213 static int tx_policy_find(struct tx_policy_cache *cache,
214 const struct tx_policy *wanted)
215 {
216 /* O(n) complexity. Not so good, but there's only 8 entries in
217 * the cache.
218 * Also lru helps to reduce search time.
219 */
220 struct tx_policy_cache_entry *it;
221 /* First search for policy in "used" list */
222 list_for_each_entry(it, &cache->used, link) {
223 if (tx_policy_is_equal(wanted, &it->policy))
224 return it - cache->cache;
225 }
226 /* Then - in "free list" */
227 list_for_each_entry(it, &cache->free, link) {
228 if (tx_policy_is_equal(wanted, &it->policy))
229 return it - cache->cache;
230 }
231 return -1;
232 }
233
234 static inline void tx_policy_use(struct tx_policy_cache *cache,
235 struct tx_policy_cache_entry *entry)
236 {
237 ++entry->policy.usage_count;
238 list_move(&entry->link, &cache->used);
239 }
240
241 static inline int tx_policy_release(struct tx_policy_cache *cache,
242 struct tx_policy_cache_entry *entry)
243 {
244 int ret = --entry->policy.usage_count;
245 if (!ret)
246 list_move(&entry->link, &cache->free);
247 return ret;
248 }
249
250 void tx_policy_clean(struct cw1200_common *priv)
251 {
252 int idx, locked;
253 struct tx_policy_cache *cache = &priv->tx_policy_cache;
254 struct tx_policy_cache_entry *entry;
255
256 cw1200_tx_queues_lock(priv);
257 spin_lock_bh(&cache->lock);
258 locked = list_empty(&cache->free);
259
260 for (idx = 0; idx < TX_POLICY_CACHE_SIZE; idx++) {
261 entry = &cache->cache[idx];
262 /* Policy usage count should be 0 at this time as all queues
263 should be empty
264 */
265 if (WARN_ON(entry->policy.usage_count)) {
266 entry->policy.usage_count = 0;
267 list_move(&entry->link, &cache->free);
268 }
269 memset(&entry->policy, 0, sizeof(entry->policy));
270 }
271 if (locked)
272 cw1200_tx_queues_unlock(priv);
273
274 cw1200_tx_queues_unlock(priv);
275 spin_unlock_bh(&cache->lock);
276 }
277
278 /* ******************************************************************** */
279 /* External TX policy cache API */
280
281 void tx_policy_init(struct cw1200_common *priv)
282 {
283 struct tx_policy_cache *cache = &priv->tx_policy_cache;
284 int i;
285
286 memset(cache, 0, sizeof(*cache));
287
288 spin_lock_init(&cache->lock);
289 INIT_LIST_HEAD(&cache->used);
290 INIT_LIST_HEAD(&cache->free);
291
292 for (i = 0; i < TX_POLICY_CACHE_SIZE; ++i)
293 list_add(&cache->cache[i].link, &cache->free);
294 }
295
296 static int tx_policy_get(struct cw1200_common *priv,
297 struct ieee80211_tx_rate *rates,
298 size_t count, bool *renew)
299 {
300 int idx;
301 struct tx_policy_cache *cache = &priv->tx_policy_cache;
302 struct tx_policy wanted;
303
304 tx_policy_build(priv, &wanted, rates, count);
305
306 spin_lock_bh(&cache->lock);
307 if (WARN_ON_ONCE(list_empty(&cache->free))) {
308 spin_unlock_bh(&cache->lock);
309 return CW1200_INVALID_RATE_ID;
310 }
311 idx = tx_policy_find(cache, &wanted);
312 if (idx >= 0) {
313 pr_debug("[TX policy] Used TX policy: %d\n", idx);
314 *renew = false;
315 } else {
316 struct tx_policy_cache_entry *entry;
317 *renew = true;
318 /* If policy is not found create a new one
319 * using the oldest entry in "free" list
320 */
321 entry = list_entry(cache->free.prev,
322 struct tx_policy_cache_entry, link);
323 entry->policy = wanted;
324 idx = entry - cache->cache;
325 pr_debug("[TX policy] New TX policy: %d\n", idx);
326 tx_policy_dump(&entry->policy);
327 }
328 tx_policy_use(cache, &cache->cache[idx]);
329 if (list_empty(&cache->free)) {
330 /* Lock TX queues. */
331 cw1200_tx_queues_lock(priv);
332 }
333 spin_unlock_bh(&cache->lock);
334 return idx;
335 }
336
337 static void tx_policy_put(struct cw1200_common *priv, int idx)
338 {
339 int usage, locked;
340 struct tx_policy_cache *cache = &priv->tx_policy_cache;
341
342 spin_lock_bh(&cache->lock);
343 locked = list_empty(&cache->free);
344 usage = tx_policy_release(cache, &cache->cache[idx]);
345 if (locked && !usage) {
346 /* Unlock TX queues. */
347 cw1200_tx_queues_unlock(priv);
348 }
349 spin_unlock_bh(&cache->lock);
350 }
351
352 static int tx_policy_upload(struct cw1200_common *priv)
353 {
354 struct tx_policy_cache *cache = &priv->tx_policy_cache;
355 int i;
356 struct wsm_set_tx_rate_retry_policy arg = {
357 .num = 0,
358 };
359 spin_lock_bh(&cache->lock);
360
361 /* Upload only modified entries. */
362 for (i = 0; i < TX_POLICY_CACHE_SIZE; ++i) {
363 struct tx_policy *src = &cache->cache[i].policy;
364 if (src->retry_count && !src->uploaded) {
365 struct wsm_tx_rate_retry_policy *dst =
366 &arg.tbl[arg.num];
367 dst->index = i;
368 dst->short_retries = priv->short_frame_max_tx_count;
369 dst->long_retries = priv->long_frame_max_tx_count;
370
371 dst->flags = WSM_TX_RATE_POLICY_FLAG_TERMINATE_WHEN_FINISHED |
372 WSM_TX_RATE_POLICY_FLAG_COUNT_INITIAL_TRANSMIT;
373 memcpy(dst->rate_count_indices, src->tbl,
374 sizeof(dst->rate_count_indices));
375 src->uploaded = 1;
376 ++arg.num;
377 }
378 }
379 spin_unlock_bh(&cache->lock);
380 cw1200_debug_tx_cache_miss(priv);
381 pr_debug("[TX policy] Upload %d policies\n", arg.num);
382 return wsm_set_tx_rate_retry_policy(priv, &arg);
383 }
384
385 void tx_policy_upload_work(struct work_struct *work)
386 {
387 struct cw1200_common *priv =
388 container_of(work, struct cw1200_common, tx_policy_upload_work);
389
390 pr_debug("[TX] TX policy upload.\n");
391 tx_policy_upload(priv);
392
393 wsm_unlock_tx(priv);
394 cw1200_tx_queues_unlock(priv);
395 }
396
397 /* ******************************************************************** */
398 /* cw1200 TX implementation */
399
400 struct cw1200_txinfo {
401 struct sk_buff *skb;
402 unsigned queue;
403 struct ieee80211_tx_info *tx_info;
404 const struct ieee80211_rate *rate;
405 struct ieee80211_hdr *hdr;
406 size_t hdrlen;
407 const u8 *da;
408 struct cw1200_sta_priv *sta_priv;
409 struct ieee80211_sta *sta;
410 struct cw1200_txpriv txpriv;
411 };
412
413 u32 cw1200_rate_mask_to_wsm(struct cw1200_common *priv, u32 rates)
414 {
415 u32 ret = 0;
416 int i;
417 for (i = 0; i < 32; ++i) {
418 if (rates & BIT(i))
419 ret |= BIT(priv->rates[i].hw_value);
420 }
421 return ret;
422 }
423
424 static const struct ieee80211_rate *
425 cw1200_get_tx_rate(const struct cw1200_common *priv,
426 const struct ieee80211_tx_rate *rate)
427 {
428 if (rate->idx < 0)
429 return NULL;
430 if (rate->flags & IEEE80211_TX_RC_MCS)
431 return &priv->mcs_rates[rate->idx];
432 return &priv->hw->wiphy->bands[priv->channel->band]->
433 bitrates[rate->idx];
434 }
435
436 static int
437 cw1200_tx_h_calc_link_ids(struct cw1200_common *priv,
438 struct cw1200_txinfo *t)
439 {
440 if (t->sta && t->sta_priv->link_id)
441 t->txpriv.raw_link_id =
442 t->txpriv.link_id =
443 t->sta_priv->link_id;
444 else if (priv->mode != NL80211_IFTYPE_AP)
445 t->txpriv.raw_link_id =
446 t->txpriv.link_id = 0;
447 else if (is_multicast_ether_addr(t->da)) {
448 if (priv->enable_beacon) {
449 t->txpriv.raw_link_id = 0;
450 t->txpriv.link_id = CW1200_LINK_ID_AFTER_DTIM;
451 } else {
452 t->txpriv.raw_link_id = 0;
453 t->txpriv.link_id = 0;
454 }
455 } else {
456 t->txpriv.link_id = cw1200_find_link_id(priv, t->da);
457 if (!t->txpriv.link_id)
458 t->txpriv.link_id = cw1200_alloc_link_id(priv, t->da);
459 if (!t->txpriv.link_id) {
460 wiphy_err(priv->hw->wiphy,
461 "No more link IDs available.\n");
462 return -ENOENT;
463 }
464 t->txpriv.raw_link_id = t->txpriv.link_id;
465 }
466 if (t->txpriv.raw_link_id)
467 priv->link_id_db[t->txpriv.raw_link_id - 1].timestamp =
468 jiffies;
469 if (t->sta && (t->sta->uapsd_queues & BIT(t->queue)))
470 t->txpriv.link_id = CW1200_LINK_ID_UAPSD;
471 return 0;
472 }
473
474 static void
475 cw1200_tx_h_pm(struct cw1200_common *priv,
476 struct cw1200_txinfo *t)
477 {
478 if (ieee80211_is_auth(t->hdr->frame_control)) {
479 u32 mask = ~BIT(t->txpriv.raw_link_id);
480 spin_lock_bh(&priv->ps_state_lock);
481 priv->sta_asleep_mask &= mask;
482 priv->pspoll_mask &= mask;
483 spin_unlock_bh(&priv->ps_state_lock);
484 }
485 }
486
487 static void
488 cw1200_tx_h_calc_tid(struct cw1200_common *priv,
489 struct cw1200_txinfo *t)
490 {
491 if (ieee80211_is_data_qos(t->hdr->frame_control)) {
492 u8 *qos = ieee80211_get_qos_ctl(t->hdr);
493 t->txpriv.tid = qos[0] & IEEE80211_QOS_CTL_TID_MASK;
494 } else if (ieee80211_is_data(t->hdr->frame_control)) {
495 t->txpriv.tid = 0;
496 }
497 }
498
499 static int
500 cw1200_tx_h_crypt(struct cw1200_common *priv,
501 struct cw1200_txinfo *t)
502 {
503 if (!t->tx_info->control.hw_key ||
504 !ieee80211_has_protected(t->hdr->frame_control))
505 return 0;
506
507 t->hdrlen += t->tx_info->control.hw_key->iv_len;
508 skb_put(t->skb, t->tx_info->control.hw_key->icv_len);
509
510 if (t->tx_info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
511 skb_put(t->skb, 8); /* MIC space */
512
513 return 0;
514 }
515
516 static int
517 cw1200_tx_h_align(struct cw1200_common *priv,
518 struct cw1200_txinfo *t,
519 u8 *flags)
520 {
521 size_t offset = (size_t)t->skb->data & 3;
522
523 if (!offset)
524 return 0;
525
526 if (offset & 1) {
527 wiphy_err(priv->hw->wiphy,
528 "Bug: attempt to transmit a frame with wrong alignment: %zu\n",
529 offset);
530 return -EINVAL;
531 }
532
533 if (skb_headroom(t->skb) < offset) {
534 wiphy_err(priv->hw->wiphy,
535 "Bug: no space allocated for DMA alignment. headroom: %d\n",
536 skb_headroom(t->skb));
537 return -ENOMEM;
538 }
539 skb_push(t->skb, offset);
540 t->hdrlen += offset;
541 t->txpriv.offset += offset;
542 *flags |= WSM_TX_2BYTES_SHIFT;
543 cw1200_debug_tx_align(priv);
544 return 0;
545 }
546
547 static int
548 cw1200_tx_h_action(struct cw1200_common *priv,
549 struct cw1200_txinfo *t)
550 {
551 struct ieee80211_mgmt *mgmt =
552 (struct ieee80211_mgmt *)t->hdr;
553 if (ieee80211_is_action(t->hdr->frame_control) &&
554 mgmt->u.action.category == WLAN_CATEGORY_BACK)
555 return 1;
556 else
557 return 0;
558 }
559
560 /* Add WSM header */
561 static struct wsm_tx *
562 cw1200_tx_h_wsm(struct cw1200_common *priv,
563 struct cw1200_txinfo *t)
564 {
565 struct wsm_tx *wsm;
566
567 if (skb_headroom(t->skb) < sizeof(struct wsm_tx)) {
568 wiphy_err(priv->hw->wiphy,
569 "Bug: no space allocated for WSM header. headroom: %d\n",
570 skb_headroom(t->skb));
571 return NULL;
572 }
573
574 wsm = skb_push(t->skb, sizeof(struct wsm_tx));
575 t->txpriv.offset += sizeof(struct wsm_tx);
576 memset(wsm, 0, sizeof(*wsm));
577 wsm->hdr.len = __cpu_to_le16(t->skb->len);
578 wsm->hdr.id = __cpu_to_le16(0x0004);
579 wsm->queue_id = wsm_queue_id_to_wsm(t->queue);
580 return wsm;
581 }
582
583 /* BT Coex specific handling */
584 static void
585 cw1200_tx_h_bt(struct cw1200_common *priv,
586 struct cw1200_txinfo *t,
587 struct wsm_tx *wsm)
588 {
589 u8 priority = 0;
590
591 if (!priv->bt_present)
592 return;
593
594 if (ieee80211_is_nullfunc(t->hdr->frame_control)) {
595 priority = WSM_EPTA_PRIORITY_MGT;
596 } else if (ieee80211_is_data(t->hdr->frame_control)) {
597 /* Skip LLC SNAP header (+6) */
598 u8 *payload = &t->skb->data[t->hdrlen];
599 __be16 *ethertype = (__be16 *)&payload[6];
600 if (be16_to_cpu(*ethertype) == ETH_P_PAE)
601 priority = WSM_EPTA_PRIORITY_EAPOL;
602 } else if (ieee80211_is_assoc_req(t->hdr->frame_control) ||
603 ieee80211_is_reassoc_req(t->hdr->frame_control)) {
604 struct ieee80211_mgmt *mgt_frame =
605 (struct ieee80211_mgmt *)t->hdr;
606
607 if (le16_to_cpu(mgt_frame->u.assoc_req.listen_interval) <
608 priv->listen_interval) {
609 pr_debug("Modified Listen Interval to %d from %d\n",
610 priv->listen_interval,
611 mgt_frame->u.assoc_req.listen_interval);
612 /* Replace listen interval derieved from
613 * the one read from SDD
614 */
615 mgt_frame->u.assoc_req.listen_interval = cpu_to_le16(priv->listen_interval);
616 }
617 }
618
619 if (!priority) {
620 if (ieee80211_is_action(t->hdr->frame_control))
621 priority = WSM_EPTA_PRIORITY_ACTION;
622 else if (ieee80211_is_mgmt(t->hdr->frame_control))
623 priority = WSM_EPTA_PRIORITY_MGT;
624 else if (wsm->queue_id == WSM_QUEUE_VOICE)
625 priority = WSM_EPTA_PRIORITY_VOICE;
626 else if (wsm->queue_id == WSM_QUEUE_VIDEO)
627 priority = WSM_EPTA_PRIORITY_VIDEO;
628 else
629 priority = WSM_EPTA_PRIORITY_DATA;
630 }
631
632 pr_debug("[TX] EPTA priority %d.\n", priority);
633
634 wsm->flags |= priority << 1;
635 }
636
637 static int
638 cw1200_tx_h_rate_policy(struct cw1200_common *priv,
639 struct cw1200_txinfo *t,
640 struct wsm_tx *wsm)
641 {
642 bool tx_policy_renew = false;
643
644 t->txpriv.rate_id = tx_policy_get(priv,
645 t->tx_info->control.rates, IEEE80211_TX_MAX_RATES,
646 &tx_policy_renew);
647 if (t->txpriv.rate_id == CW1200_INVALID_RATE_ID)
648 return -EFAULT;
649
650 wsm->flags |= t->txpriv.rate_id << 4;
651
652 t->rate = cw1200_get_tx_rate(priv,
653 &t->tx_info->control.rates[0]),
654 wsm->max_tx_rate = t->rate->hw_value;
655 if (t->rate->flags & IEEE80211_TX_RC_MCS) {
656 if (cw1200_ht_greenfield(&priv->ht_info))
657 wsm->ht_tx_parameters |=
658 __cpu_to_le32(WSM_HT_TX_GREENFIELD);
659 else
660 wsm->ht_tx_parameters |=
661 __cpu_to_le32(WSM_HT_TX_MIXED);
662 }
663
664 if (tx_policy_renew) {
665 pr_debug("[TX] TX policy renew.\n");
666 /* It's not so optimal to stop TX queues every now and then.
667 * Better to reimplement task scheduling with
668 * a counter. TODO.
669 */
670 wsm_lock_tx_async(priv);
671 cw1200_tx_queues_lock(priv);
672 if (queue_work(priv->workqueue,
673 &priv->tx_policy_upload_work) <= 0) {
674 cw1200_tx_queues_unlock(priv);
675 wsm_unlock_tx(priv);
676 }
677 }
678 return 0;
679 }
680
681 static bool
682 cw1200_tx_h_pm_state(struct cw1200_common *priv,
683 struct cw1200_txinfo *t)
684 {
685 int was_buffered = 1;
686
687 if (t->txpriv.link_id == CW1200_LINK_ID_AFTER_DTIM &&
688 !priv->buffered_multicasts) {
689 priv->buffered_multicasts = true;
690 if (priv->sta_asleep_mask)
691 queue_work(priv->workqueue,
692 &priv->multicast_start_work);
693 }
694
695 if (t->txpriv.raw_link_id && t->txpriv.tid < CW1200_MAX_TID)
696 was_buffered = priv->link_id_db[t->txpriv.raw_link_id - 1].buffered[t->txpriv.tid]++;
697
698 return !was_buffered;
699 }
700
701 /* ******************************************************************** */
702
703 void cw1200_tx(struct ieee80211_hw *dev,
704 struct ieee80211_tx_control *control,
705 struct sk_buff *skb)
706 {
707 struct cw1200_common *priv = dev->priv;
708 struct cw1200_txinfo t = {
709 .skb = skb,
710 .queue = skb_get_queue_mapping(skb),
711 .tx_info = IEEE80211_SKB_CB(skb),
712 .hdr = (struct ieee80211_hdr *)skb->data,
713 .txpriv.tid = CW1200_MAX_TID,
714 .txpriv.rate_id = CW1200_INVALID_RATE_ID,
715 };
716 struct ieee80211_sta *sta;
717 struct wsm_tx *wsm;
718 bool tid_update = false;
719 u8 flags = 0;
720 int ret;
721
722 if (priv->bh_error)
723 goto drop;
724
725 t.hdrlen = ieee80211_hdrlen(t.hdr->frame_control);
726 t.da = ieee80211_get_DA(t.hdr);
727 if (control) {
728 t.sta = control->sta;
729 t.sta_priv = (struct cw1200_sta_priv *)&t.sta->drv_priv;
730 }
731
732 if (WARN_ON(t.queue >= 4))
733 goto drop;
734
735 ret = cw1200_tx_h_calc_link_ids(priv, &t);
736 if (ret)
737 goto drop;
738
739 pr_debug("[TX] TX %d bytes (queue: %d, link_id: %d (%d)).\n",
740 skb->len, t.queue, t.txpriv.link_id,
741 t.txpriv.raw_link_id);
742
743 cw1200_tx_h_pm(priv, &t);
744 cw1200_tx_h_calc_tid(priv, &t);
745 ret = cw1200_tx_h_crypt(priv, &t);
746 if (ret)
747 goto drop;
748 ret = cw1200_tx_h_align(priv, &t, &flags);
749 if (ret)
750 goto drop;
751 ret = cw1200_tx_h_action(priv, &t);
752 if (ret)
753 goto drop;
754 wsm = cw1200_tx_h_wsm(priv, &t);
755 if (!wsm) {
756 ret = -ENOMEM;
757 goto drop;
758 }
759 wsm->flags |= flags;
760 cw1200_tx_h_bt(priv, &t, wsm);
761 ret = cw1200_tx_h_rate_policy(priv, &t, wsm);
762 if (ret)
763 goto drop;
764
765 rcu_read_lock();
766 sta = rcu_dereference(t.sta);
767
768 spin_lock_bh(&priv->ps_state_lock);
769 {
770 tid_update = cw1200_tx_h_pm_state(priv, &t);
771 BUG_ON(cw1200_queue_put(&priv->tx_queue[t.queue],
772 t.skb, &t.txpriv));
773 }
774 spin_unlock_bh(&priv->ps_state_lock);
775
776 if (tid_update && sta)
777 ieee80211_sta_set_buffered(sta, t.txpriv.tid, true);
778
779 rcu_read_unlock();
780
781 cw1200_bh_wakeup(priv);
782
783 return;
784
785 drop:
786 cw1200_skb_dtor(priv, skb, &t.txpriv);
787 return;
788 }
789
790 /* ******************************************************************** */
791
792 static int cw1200_handle_action_rx(struct cw1200_common *priv,
793 struct sk_buff *skb)
794 {
795 struct ieee80211_mgmt *mgmt = (void *)skb->data;
796
797 /* Filter block ACK negotiation: fully controlled by firmware */
798 if (mgmt->u.action.category == WLAN_CATEGORY_BACK)
799 return 1;
800
801 return 0;
802 }
803
804 static int cw1200_handle_pspoll(struct cw1200_common *priv,
805 struct sk_buff *skb)
806 {
807 struct ieee80211_sta *sta;
808 struct ieee80211_pspoll *pspoll = (struct ieee80211_pspoll *)skb->data;
809 int link_id = 0;
810 u32 pspoll_mask = 0;
811 int drop = 1;
812 int i;
813
814 if (priv->join_status != CW1200_JOIN_STATUS_AP)
815 goto done;
816 if (memcmp(priv->vif->addr, pspoll->bssid, ETH_ALEN))
817 goto done;
818
819 rcu_read_lock();
820 sta = ieee80211_find_sta(priv->vif, pspoll->ta);
821 if (sta) {
822 struct cw1200_sta_priv *sta_priv;
823 sta_priv = (struct cw1200_sta_priv *)&sta->drv_priv;
824 link_id = sta_priv->link_id;
825 pspoll_mask = BIT(sta_priv->link_id);
826 }
827 rcu_read_unlock();
828 if (!link_id)
829 goto done;
830
831 priv->pspoll_mask |= pspoll_mask;
832 drop = 0;
833
834 /* Do not report pspols if data for given link id is queued already. */
835 for (i = 0; i < 4; ++i) {
836 if (cw1200_queue_get_num_queued(&priv->tx_queue[i],
837 pspoll_mask)) {
838 cw1200_bh_wakeup(priv);
839 drop = 1;
840 break;
841 }
842 }
843 pr_debug("[RX] PSPOLL: %s\n", drop ? "local" : "fwd");
844 done:
845 return drop;
846 }
847
848 /* ******************************************************************** */
849
850 void cw1200_tx_confirm_cb(struct cw1200_common *priv,
851 int link_id,
852 struct wsm_tx_confirm *arg)
853 {
854 u8 queue_id = cw1200_queue_get_queue_id(arg->packet_id);
855 struct cw1200_queue *queue = &priv->tx_queue[queue_id];
856 struct sk_buff *skb;
857 const struct cw1200_txpriv *txpriv;
858
859 pr_debug("[TX] TX confirm: %d, %d.\n",
860 arg->status, arg->ack_failures);
861
862 if (priv->mode == NL80211_IFTYPE_UNSPECIFIED) {
863 /* STA is stopped. */
864 return;
865 }
866
867 if (WARN_ON(queue_id >= 4))
868 return;
869
870 if (arg->status)
871 pr_debug("TX failed: %d.\n", arg->status);
872
873 if ((arg->status == WSM_REQUEUE) &&
874 (arg->flags & WSM_TX_STATUS_REQUEUE)) {
875 /* "Requeue" means "implicit suspend" */
876 struct wsm_suspend_resume suspend = {
877 .link_id = link_id,
878 .stop = 1,
879 .multicast = !link_id,
880 };
881 cw1200_suspend_resume(priv, &suspend);
882 wiphy_warn(priv->hw->wiphy, "Requeue for link_id %d (try %d). STAs asleep: 0x%.8X\n",
883 link_id,
884 cw1200_queue_get_generation(arg->packet_id) + 1,
885 priv->sta_asleep_mask);
886 cw1200_queue_requeue(queue, arg->packet_id);
887 spin_lock_bh(&priv->ps_state_lock);
888 if (!link_id) {
889 priv->buffered_multicasts = true;
890 if (priv->sta_asleep_mask) {
891 queue_work(priv->workqueue,
892 &priv->multicast_start_work);
893 }
894 }
895 spin_unlock_bh(&priv->ps_state_lock);
896 } else if (!cw1200_queue_get_skb(queue, arg->packet_id,
897 &skb, &txpriv)) {
898 struct ieee80211_tx_info *tx = IEEE80211_SKB_CB(skb);
899 int tx_count = arg->ack_failures;
900 u8 ht_flags = 0;
901 int i;
902
903 if (cw1200_ht_greenfield(&priv->ht_info))
904 ht_flags |= IEEE80211_TX_RC_GREEN_FIELD;
905
906 spin_lock(&priv->bss_loss_lock);
907 if (priv->bss_loss_state &&
908 arg->packet_id == priv->bss_loss_confirm_id) {
909 if (arg->status) {
910 /* Recovery failed */
911 __cw1200_cqm_bssloss_sm(priv, 0, 0, 1);
912 } else {
913 /* Recovery succeeded */
914 __cw1200_cqm_bssloss_sm(priv, 0, 1, 0);
915 }
916 }
917 spin_unlock(&priv->bss_loss_lock);
918
919 if (!arg->status) {
920 tx->flags |= IEEE80211_TX_STAT_ACK;
921 ++tx_count;
922 cw1200_debug_txed(priv);
923 if (arg->flags & WSM_TX_STATUS_AGGREGATION) {
924 /* Do not report aggregation to mac80211:
925 * it confuses minstrel a lot.
926 */
927 /* tx->flags |= IEEE80211_TX_STAT_AMPDU; */
928 cw1200_debug_txed_agg(priv);
929 }
930 } else {
931 if (tx_count)
932 ++tx_count;
933 }
934
935 for (i = 0; i < IEEE80211_TX_MAX_RATES; ++i) {
936 if (tx->status.rates[i].count >= tx_count) {
937 tx->status.rates[i].count = tx_count;
938 break;
939 }
940 tx_count -= tx->status.rates[i].count;
941 if (tx->status.rates[i].flags & IEEE80211_TX_RC_MCS)
942 tx->status.rates[i].flags |= ht_flags;
943 }
944
945 for (++i; i < IEEE80211_TX_MAX_RATES; ++i) {
946 tx->status.rates[i].count = 0;
947 tx->status.rates[i].idx = -1;
948 }
949
950 /* Pull off any crypto trailers that we added on */
951 if (tx->control.hw_key) {
952 skb_trim(skb, skb->len - tx->control.hw_key->icv_len);
953 if (tx->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
954 skb_trim(skb, skb->len - 8); /* MIC space */
955 }
956 cw1200_queue_remove(queue, arg->packet_id);
957 }
958 /* XXX TODO: Only wake if there are pending transmits.. */
959 cw1200_bh_wakeup(priv);
960 }
961
962 static void cw1200_notify_buffered_tx(struct cw1200_common *priv,
963 struct sk_buff *skb, int link_id, int tid)
964 {
965 struct ieee80211_sta *sta;
966 struct ieee80211_hdr *hdr;
967 u8 *buffered;
968 u8 still_buffered = 0;
969
970 if (link_id && tid < CW1200_MAX_TID) {
971 buffered = priv->link_id_db
972 [link_id - 1].buffered;
973
974 spin_lock_bh(&priv->ps_state_lock);
975 if (!WARN_ON(!buffered[tid]))
976 still_buffered = --buffered[tid];
977 spin_unlock_bh(&priv->ps_state_lock);
978
979 if (!still_buffered && tid < CW1200_MAX_TID) {
980 hdr = (struct ieee80211_hdr *)skb->data;
981 rcu_read_lock();
982 sta = ieee80211_find_sta(priv->vif, hdr->addr1);
983 if (sta)
984 ieee80211_sta_set_buffered(sta, tid, false);
985 rcu_read_unlock();
986 }
987 }
988 }
989
990 void cw1200_skb_dtor(struct cw1200_common *priv,
991 struct sk_buff *skb,
992 const struct cw1200_txpriv *txpriv)
993 {
994 skb_pull(skb, txpriv->offset);
995 if (txpriv->rate_id != CW1200_INVALID_RATE_ID) {
996 cw1200_notify_buffered_tx(priv, skb,
997 txpriv->raw_link_id, txpriv->tid);
998 tx_policy_put(priv, txpriv->rate_id);
999 }
1000 ieee80211_tx_status(priv->hw, skb);
1001 }
1002
1003 void cw1200_rx_cb(struct cw1200_common *priv,
1004 struct wsm_rx *arg,
1005 int link_id,
1006 struct sk_buff **skb_p)
1007 {
1008 struct sk_buff *skb = *skb_p;
1009 struct ieee80211_rx_status *hdr = IEEE80211_SKB_RXCB(skb);
1010 struct ieee80211_hdr *frame = (struct ieee80211_hdr *)skb->data;
1011 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
1012 struct cw1200_link_entry *entry = NULL;
1013 unsigned long grace_period;
1014
1015 bool early_data = false;
1016 bool p2p = priv->vif && priv->vif->p2p;
1017 size_t hdrlen;
1018 hdr->flag = 0;
1019
1020 if (priv->mode == NL80211_IFTYPE_UNSPECIFIED) {
1021 /* STA is stopped. */
1022 goto drop;
1023 }
1024
1025 if (link_id && link_id <= CW1200_MAX_STA_IN_AP_MODE) {
1026 entry = &priv->link_id_db[link_id - 1];
1027 if (entry->status == CW1200_LINK_SOFT &&
1028 ieee80211_is_data(frame->frame_control))
1029 early_data = true;
1030 entry->timestamp = jiffies;
1031 } else if (p2p &&
1032 ieee80211_is_action(frame->frame_control) &&
1033 (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC)) {
1034 pr_debug("[RX] Going to MAP&RESET link ID\n");
1035 WARN_ON(work_pending(&priv->linkid_reset_work));
1036 memcpy(&priv->action_frame_sa[0],
1037 ieee80211_get_SA(frame), ETH_ALEN);
1038 priv->action_linkid = 0;
1039 schedule_work(&priv->linkid_reset_work);
1040 }
1041
1042 if (link_id && p2p &&
1043 ieee80211_is_action(frame->frame_control) &&
1044 (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC)) {
1045 /* Link ID already exists for the ACTION frame.
1046 * Reset and Remap
1047 */
1048 WARN_ON(work_pending(&priv->linkid_reset_work));
1049 memcpy(&priv->action_frame_sa[0],
1050 ieee80211_get_SA(frame), ETH_ALEN);
1051 priv->action_linkid = link_id;
1052 schedule_work(&priv->linkid_reset_work);
1053 }
1054 if (arg->status) {
1055 if (arg->status == WSM_STATUS_MICFAILURE) {
1056 pr_debug("[RX] MIC failure.\n");
1057 hdr->flag |= RX_FLAG_MMIC_ERROR;
1058 } else if (arg->status == WSM_STATUS_NO_KEY_FOUND) {
1059 pr_debug("[RX] No key found.\n");
1060 goto drop;
1061 } else {
1062 pr_debug("[RX] Receive failure: %d.\n",
1063 arg->status);
1064 goto drop;
1065 }
1066 }
1067
1068 if (skb->len < sizeof(struct ieee80211_pspoll)) {
1069 wiphy_warn(priv->hw->wiphy, "Malformed SDU rx'ed. Size is lesser than IEEE header.\n");
1070 goto drop;
1071 }
1072
1073 if (ieee80211_is_pspoll(frame->frame_control))
1074 if (cw1200_handle_pspoll(priv, skb))
1075 goto drop;
1076
1077 hdr->band = ((arg->channel_number & 0xff00) ||
1078 (arg->channel_number > 14)) ?
1079 NL80211_BAND_5GHZ : NL80211_BAND_2GHZ;
1080 hdr->freq = ieee80211_channel_to_frequency(
1081 arg->channel_number,
1082 hdr->band);
1083
1084 if (arg->rx_rate >= 14) {
1085 hdr->encoding = RX_ENC_HT;
1086 hdr->rate_idx = arg->rx_rate - 14;
1087 } else if (arg->rx_rate >= 4) {
1088 hdr->rate_idx = arg->rx_rate - 2;
1089 } else {
1090 hdr->rate_idx = arg->rx_rate;
1091 }
1092
1093 hdr->signal = (s8)arg->rcpi_rssi;
1094 hdr->antenna = 0;
1095
1096 hdrlen = ieee80211_hdrlen(frame->frame_control);
1097
1098 if (WSM_RX_STATUS_ENCRYPTION(arg->flags)) {
1099 size_t iv_len = 0, icv_len = 0;
1100
1101 hdr->flag |= RX_FLAG_DECRYPTED | RX_FLAG_IV_STRIPPED;
1102
1103 /* Oops... There is no fast way to ask mac80211 about
1104 * IV/ICV lengths. Even defineas are not exposed.
1105 */
1106 switch (WSM_RX_STATUS_ENCRYPTION(arg->flags)) {
1107 case WSM_RX_STATUS_WEP:
1108 iv_len = 4 /* WEP_IV_LEN */;
1109 icv_len = 4 /* WEP_ICV_LEN */;
1110 break;
1111 case WSM_RX_STATUS_TKIP:
1112 iv_len = 8 /* TKIP_IV_LEN */;
1113 icv_len = 4 /* TKIP_ICV_LEN */
1114 + 8 /*MICHAEL_MIC_LEN*/;
1115 hdr->flag |= RX_FLAG_MMIC_STRIPPED;
1116 break;
1117 case WSM_RX_STATUS_AES:
1118 iv_len = 8 /* CCMP_HDR_LEN */;
1119 icv_len = 8 /* CCMP_MIC_LEN */;
1120 break;
1121 case WSM_RX_STATUS_WAPI:
1122 iv_len = 18 /* WAPI_HDR_LEN */;
1123 icv_len = 16 /* WAPI_MIC_LEN */;
1124 break;
1125 default:
1126 pr_warn("Unknown encryption type %d\n",
1127 WSM_RX_STATUS_ENCRYPTION(arg->flags));
1128 goto drop;
1129 }
1130
1131 /* Firmware strips ICV in case of MIC failure. */
1132 if (arg->status == WSM_STATUS_MICFAILURE)
1133 icv_len = 0;
1134
1135 if (skb->len < hdrlen + iv_len + icv_len) {
1136 wiphy_warn(priv->hw->wiphy, "Malformed SDU rx'ed. Size is lesser than crypto headers.\n");
1137 goto drop;
1138 }
1139
1140 /* Remove IV, ICV and MIC */
1141 skb_trim(skb, skb->len - icv_len);
1142 memmove(skb->data + iv_len, skb->data, hdrlen);
1143 skb_pull(skb, iv_len);
1144 }
1145
1146 /* Remove TSF from the end of frame */
1147 if (arg->flags & WSM_RX_STATUS_TSF_INCLUDED) {
1148 memcpy(&hdr->mactime, skb->data + skb->len - 8, 8);
1149 hdr->mactime = le64_to_cpu(hdr->mactime);
1150 if (skb->len >= 8)
1151 skb_trim(skb, skb->len - 8);
1152 } else {
1153 hdr->mactime = 0;
1154 }
1155
1156 cw1200_debug_rxed(priv);
1157 if (arg->flags & WSM_RX_STATUS_AGGREGATE)
1158 cw1200_debug_rxed_agg(priv);
1159
1160 if (ieee80211_is_action(frame->frame_control) &&
1161 (arg->flags & WSM_RX_STATUS_ADDRESS1)) {
1162 if (cw1200_handle_action_rx(priv, skb))
1163 return;
1164 } else if (ieee80211_is_beacon(frame->frame_control) &&
1165 !arg->status && priv->vif &&
1166 ether_addr_equal(ieee80211_get_SA(frame), priv->vif->bss_conf.bssid)) {
1167 const u8 *tim_ie;
1168 u8 *ies = ((struct ieee80211_mgmt *)
1169 (skb->data))->u.beacon.variable;
1170 size_t ies_len = skb->len - (ies - (u8 *)(skb->data));
1171
1172 tim_ie = cfg80211_find_ie(WLAN_EID_TIM, ies, ies_len);
1173 if (tim_ie) {
1174 struct ieee80211_tim_ie *tim =
1175 (struct ieee80211_tim_ie *)&tim_ie[2];
1176
1177 if (priv->join_dtim_period != tim->dtim_period) {
1178 priv->join_dtim_period = tim->dtim_period;
1179 queue_work(priv->workqueue,
1180 &priv->set_beacon_wakeup_period_work);
1181 }
1182 }
1183
1184 /* Disable beacon filter once we're associated... */
1185 if (priv->disable_beacon_filter &&
1186 (priv->vif->bss_conf.assoc ||
1187 priv->vif->bss_conf.ibss_joined)) {
1188 priv->disable_beacon_filter = false;
1189 queue_work(priv->workqueue,
1190 &priv->update_filtering_work);
1191 }
1192 }
1193
1194 /* Stay awake after frame is received to give
1195 * userspace chance to react and acquire appropriate
1196 * wakelock.
1197 */
1198 if (ieee80211_is_auth(frame->frame_control))
1199 grace_period = 5 * HZ;
1200 else if (ieee80211_is_deauth(frame->frame_control))
1201 grace_period = 5 * HZ;
1202 else
1203 grace_period = 1 * HZ;
1204 cw1200_pm_stay_awake(&priv->pm_state, grace_period);
1205
1206 if (early_data) {
1207 spin_lock_bh(&priv->ps_state_lock);
1208 /* Double-check status with lock held */
1209 if (entry->status == CW1200_LINK_SOFT)
1210 skb_queue_tail(&entry->rx_queue, skb);
1211 else
1212 ieee80211_rx_irqsafe(priv->hw, skb);
1213 spin_unlock_bh(&priv->ps_state_lock);
1214 } else {
1215 ieee80211_rx_irqsafe(priv->hw, skb);
1216 }
1217 *skb_p = NULL;
1218
1219 return;
1220
1221 drop:
1222 /* TODO: update failure counters */
1223 return;
1224 }
1225
1226 /* ******************************************************************** */
1227 /* Security */
1228
1229 int cw1200_alloc_key(struct cw1200_common *priv)
1230 {
1231 int idx;
1232
1233 idx = ffs(~priv->key_map) - 1;
1234 if (idx < 0 || idx > WSM_KEY_MAX_INDEX)
1235 return -1;
1236
1237 priv->key_map |= BIT(idx);
1238 priv->keys[idx].index = idx;
1239 return idx;
1240 }
1241
1242 void cw1200_free_key(struct cw1200_common *priv, int idx)
1243 {
1244 BUG_ON(!(priv->key_map & BIT(idx)));
1245 memset(&priv->keys[idx], 0, sizeof(priv->keys[idx]));
1246 priv->key_map &= ~BIT(idx);
1247 }
1248
1249 void cw1200_free_keys(struct cw1200_common *priv)
1250 {
1251 memset(&priv->keys, 0, sizeof(priv->keys));
1252 priv->key_map = 0;
1253 }
1254
1255 int cw1200_upload_keys(struct cw1200_common *priv)
1256 {
1257 int idx, ret = 0;
1258 for (idx = 0; idx <= WSM_KEY_MAX_INDEX; ++idx)
1259 if (priv->key_map & BIT(idx)) {
1260 ret = wsm_add_key(priv, &priv->keys[idx]);
1261 if (ret < 0)
1262 break;
1263 }
1264 return ret;
1265 }
1266
1267 /* Workaround for WFD test case 6.1.10 */
1268 void cw1200_link_id_reset(struct work_struct *work)
1269 {
1270 struct cw1200_common *priv =
1271 container_of(work, struct cw1200_common, linkid_reset_work);
1272 int temp_linkid;
1273
1274 if (!priv->action_linkid) {
1275 /* In GO mode we can receive ACTION frames without a linkID */
1276 temp_linkid = cw1200_alloc_link_id(priv,
1277 &priv->action_frame_sa[0]);
1278 WARN_ON(!temp_linkid);
1279 if (temp_linkid) {
1280 /* Make sure we execute the WQ */
1281 flush_workqueue(priv->workqueue);
1282 /* Release the link ID */
1283 spin_lock_bh(&priv->ps_state_lock);
1284 priv->link_id_db[temp_linkid - 1].prev_status =
1285 priv->link_id_db[temp_linkid - 1].status;
1286 priv->link_id_db[temp_linkid - 1].status =
1287 CW1200_LINK_RESET;
1288 spin_unlock_bh(&priv->ps_state_lock);
1289 wsm_lock_tx_async(priv);
1290 if (queue_work(priv->workqueue,
1291 &priv->link_id_work) <= 0)
1292 wsm_unlock_tx(priv);
1293 }
1294 } else {
1295 spin_lock_bh(&priv->ps_state_lock);
1296 priv->link_id_db[priv->action_linkid - 1].prev_status =
1297 priv->link_id_db[priv->action_linkid - 1].status;
1298 priv->link_id_db[priv->action_linkid - 1].status =
1299 CW1200_LINK_RESET_REMAP;
1300 spin_unlock_bh(&priv->ps_state_lock);
1301 wsm_lock_tx_async(priv);
1302 if (queue_work(priv->workqueue, &priv->link_id_work) <= 0)
1303 wsm_unlock_tx(priv);
1304 flush_workqueue(priv->workqueue);
1305 }
1306 }
1307
1308 int cw1200_find_link_id(struct cw1200_common *priv, const u8 *mac)
1309 {
1310 int i, ret = 0;
1311 spin_lock_bh(&priv->ps_state_lock);
1312 for (i = 0; i < CW1200_MAX_STA_IN_AP_MODE; ++i) {
1313 if (!memcmp(mac, priv->link_id_db[i].mac, ETH_ALEN) &&
1314 priv->link_id_db[i].status) {
1315 priv->link_id_db[i].timestamp = jiffies;
1316 ret = i + 1;
1317 break;
1318 }
1319 }
1320 spin_unlock_bh(&priv->ps_state_lock);
1321 return ret;
1322 }
1323
1324 int cw1200_alloc_link_id(struct cw1200_common *priv, const u8 *mac)
1325 {
1326 int i, ret = 0;
1327 unsigned long max_inactivity = 0;
1328 unsigned long now = jiffies;
1329
1330 spin_lock_bh(&priv->ps_state_lock);
1331 for (i = 0; i < CW1200_MAX_STA_IN_AP_MODE; ++i) {
1332 if (!priv->link_id_db[i].status) {
1333 ret = i + 1;
1334 break;
1335 } else if (priv->link_id_db[i].status != CW1200_LINK_HARD &&
1336 !priv->tx_queue_stats.link_map_cache[i + 1]) {
1337 unsigned long inactivity =
1338 now - priv->link_id_db[i].timestamp;
1339 if (inactivity < max_inactivity)
1340 continue;
1341 max_inactivity = inactivity;
1342 ret = i + 1;
1343 }
1344 }
1345 if (ret) {
1346 struct cw1200_link_entry *entry = &priv->link_id_db[ret - 1];
1347 pr_debug("[AP] STA added, link_id: %d\n", ret);
1348 entry->status = CW1200_LINK_RESERVE;
1349 memcpy(&entry->mac, mac, ETH_ALEN);
1350 memset(&entry->buffered, 0, CW1200_MAX_TID);
1351 skb_queue_head_init(&entry->rx_queue);
1352 wsm_lock_tx_async(priv);
1353 if (queue_work(priv->workqueue, &priv->link_id_work) <= 0)
1354 wsm_unlock_tx(priv);
1355 } else {
1356 wiphy_info(priv->hw->wiphy,
1357 "[AP] Early: no more link IDs available.\n");
1358 }
1359
1360 spin_unlock_bh(&priv->ps_state_lock);
1361 return ret;
1362 }
1363
1364 void cw1200_link_id_work(struct work_struct *work)
1365 {
1366 struct cw1200_common *priv =
1367 container_of(work, struct cw1200_common, link_id_work);
1368 wsm_flush_tx(priv);
1369 cw1200_link_id_gc_work(&priv->link_id_gc_work.work);
1370 wsm_unlock_tx(priv);
1371 }
1372
1373 void cw1200_link_id_gc_work(struct work_struct *work)
1374 {
1375 struct cw1200_common *priv =
1376 container_of(work, struct cw1200_common, link_id_gc_work.work);
1377 struct wsm_reset reset = {
1378 .reset_statistics = false,
1379 };
1380 struct wsm_map_link map_link = {
1381 .link_id = 0,
1382 };
1383 unsigned long now = jiffies;
1384 unsigned long next_gc = -1;
1385 long ttl;
1386 bool need_reset;
1387 u32 mask;
1388 int i;
1389
1390 if (priv->join_status != CW1200_JOIN_STATUS_AP)
1391 return;
1392
1393 wsm_lock_tx(priv);
1394 spin_lock_bh(&priv->ps_state_lock);
1395 for (i = 0; i < CW1200_MAX_STA_IN_AP_MODE; ++i) {
1396 need_reset = false;
1397 mask = BIT(i + 1);
1398 if (priv->link_id_db[i].status == CW1200_LINK_RESERVE ||
1399 (priv->link_id_db[i].status == CW1200_LINK_HARD &&
1400 !(priv->link_id_map & mask))) {
1401 if (priv->link_id_map & mask) {
1402 priv->sta_asleep_mask &= ~mask;
1403 priv->pspoll_mask &= ~mask;
1404 need_reset = true;
1405 }
1406 priv->link_id_map |= mask;
1407 if (priv->link_id_db[i].status != CW1200_LINK_HARD)
1408 priv->link_id_db[i].status = CW1200_LINK_SOFT;
1409 memcpy(map_link.mac_addr, priv->link_id_db[i].mac,
1410 ETH_ALEN);
1411 spin_unlock_bh(&priv->ps_state_lock);
1412 if (need_reset) {
1413 reset.link_id = i + 1;
1414 wsm_reset(priv, &reset);
1415 }
1416 map_link.link_id = i + 1;
1417 wsm_map_link(priv, &map_link);
1418 next_gc = min(next_gc, CW1200_LINK_ID_GC_TIMEOUT);
1419 spin_lock_bh(&priv->ps_state_lock);
1420 } else if (priv->link_id_db[i].status == CW1200_LINK_SOFT) {
1421 ttl = priv->link_id_db[i].timestamp - now +
1422 CW1200_LINK_ID_GC_TIMEOUT;
1423 if (ttl <= 0) {
1424 need_reset = true;
1425 priv->link_id_db[i].status = CW1200_LINK_OFF;
1426 priv->link_id_map &= ~mask;
1427 priv->sta_asleep_mask &= ~mask;
1428 priv->pspoll_mask &= ~mask;
1429 eth_zero_addr(map_link.mac_addr);
1430 spin_unlock_bh(&priv->ps_state_lock);
1431 reset.link_id = i + 1;
1432 wsm_reset(priv, &reset);
1433 spin_lock_bh(&priv->ps_state_lock);
1434 } else {
1435 next_gc = min_t(unsigned long, next_gc, ttl);
1436 }
1437 } else if (priv->link_id_db[i].status == CW1200_LINK_RESET ||
1438 priv->link_id_db[i].status ==
1439 CW1200_LINK_RESET_REMAP) {
1440 int status = priv->link_id_db[i].status;
1441 priv->link_id_db[i].status =
1442 priv->link_id_db[i].prev_status;
1443 priv->link_id_db[i].timestamp = now;
1444 reset.link_id = i + 1;
1445 spin_unlock_bh(&priv->ps_state_lock);
1446 wsm_reset(priv, &reset);
1447 if (status == CW1200_LINK_RESET_REMAP) {
1448 memcpy(map_link.mac_addr,
1449 priv->link_id_db[i].mac,
1450 ETH_ALEN);
1451 map_link.link_id = i + 1;
1452 wsm_map_link(priv, &map_link);
1453 next_gc = min(next_gc,
1454 CW1200_LINK_ID_GC_TIMEOUT);
1455 }
1456 spin_lock_bh(&priv->ps_state_lock);
1457 }
1458 if (need_reset) {
1459 skb_queue_purge(&priv->link_id_db[i].rx_queue);
1460 pr_debug("[AP] STA removed, link_id: %d\n",
1461 reset.link_id);
1462 }
1463 }
1464 spin_unlock_bh(&priv->ps_state_lock);
1465 if (next_gc != -1)
1466 queue_delayed_work(priv->workqueue,
1467 &priv->link_id_gc_work, next_gc);
1468 wsm_unlock_tx(priv);
1469 }
Linux with added FPC-III support