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[linux-2.6-block.git] / drivers / net / wireless / p54 / txrx.c
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0a5fb84f
CL		 1/*
2 * Common 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
ee40fa06 19#include <linux/export.h>
0a5fb84f
CL		 20#include <linux/firmware.h>
21#include <linux/etherdevice.h>
1cda0fd6 22#include <asm/div64.h>
0a5fb84f
CL		 23
24#include <net/mac80211.h>
25
26#include "p54.h"
27#include "lmac.h"
28
29#ifdef P54_MM_DEBUG
30static void p54_dump_tx_queue(struct p54_common *priv)
31{
32 unsigned long flags;
33 struct ieee80211_tx_info *info;
34 struct p54_tx_info *range;
35 struct sk_buff *skb;
36 struct p54_hdr *hdr;
37 unsigned int i = 0;
38 u32 prev_addr;
39 u32 largest_hole = 0, free;
40
41 spin_lock_irqsave(&priv->tx_queue.lock, flags);
c96c31e4
JP		 42 wiphy_debug(priv->hw->wiphy, "/ --- tx queue dump (%d entries) ---\n",
43 skb_queue_len(&priv->tx_queue));
0a5fb84f
CL		 44
45 prev_addr = priv->rx_start;
46 skb_queue_walk(&priv->tx_queue, skb) {
47 info = IEEE80211_SKB_CB(skb);
48 range = (void *) info->rate_driver_data;
49 hdr = (void *) skb->data;
50
51 free = range->start_addr - prev_addr;
c96c31e4
JP		 52 wiphy_debug(priv->hw->wiphy,
53 "| [%02d] => [skb:%p skb_len:0x%04x "
54 "hdr:{flags:%02x len:%04x req_id:%04x type:%02x} "
55 "mem:{start:%04x end:%04x, free:%d}]\n",
56 i++, skb, skb->len,
57 le16_to_cpu(hdr->flags), le16_to_cpu(hdr->len),
58 le32_to_cpu(hdr->req_id), le16_to_cpu(hdr->type),
59 range->start_addr, range->end_addr, free);
0a5fb84f
CL		 60
61 prev_addr = range->end_addr;
62 largest_hole = max(largest_hole, free);
63 }
64 free = priv->rx_end - prev_addr;
65 largest_hole = max(largest_hole, free);
c96c31e4
JP		 66 wiphy_debug(priv->hw->wiphy,
67 "\\ --- [free: %d], largest free block: %d ---\n",
68 free, largest_hole);
0a5fb84f
CL		 69 spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
70}
71#endif /* P54_MM_DEBUG */
72
73/*
74 * So, the firmware is somewhat stupid and doesn't know what places in its
75 * memory incoming data should go to. By poking around in the firmware, we
76 * can find some unused memory to upload our packets to. However, data that we
77 * want the card to TX needs to stay intact until the card has told us that
78 * it is done with it. This function finds empty places we can upload to and
79 * marks allocated areas as reserved if necessary. p54_find_and_unlink_skb or
80 * p54_free_skb frees allocated areas.
81 */
82static int p54_assign_address(struct p54_common *priv, struct sk_buff *skb)
83{
84 struct sk_buff *entry, *target_skb = NULL;
85 struct ieee80211_tx_info *info;
86 struct p54_tx_info *range;
87 struct p54_hdr *data = (void *) skb->data;
88 unsigned long flags;
89 u32 last_addr = priv->rx_start;
90 u32 target_addr = priv->rx_start;
91 u16 len = priv->headroom + skb->len + priv->tailroom + 3;
92
0a5fb84f
CL		 93 info = IEEE80211_SKB_CB(skb);
94 range = (void *) info->rate_driver_data;
95 len = (range->extra_len + len) & ~0x3;
96
97 spin_lock_irqsave(&priv->tx_queue.lock, flags);
98 if (unlikely(skb_queue_len(&priv->tx_queue) == 32)) {
99 /*
100 * The tx_queue is now really full.
101 *
102 * TODO: check if the device has crashed and reset it.
103 */
104 spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
105 return -EBUSY;
106 }
107
108 skb_queue_walk(&priv->tx_queue, entry) {
109 u32 hole_size;
110 info = IEEE80211_SKB_CB(entry);
111 range = (void *) info->rate_driver_data;
112 hole_size = range->start_addr - last_addr;
113
0a5fb84f
CL		 114 if (!target_skb && hole_size >= len) {
115 target_skb = entry->prev;
116 hole_size -= len;
117 target_addr = last_addr;
118 break;
119 }
120 last_addr = range->end_addr;
121 }
122 if (unlikely(!target_skb)) {
123 if (priv->rx_end - last_addr >= len) {
124 target_skb = priv->tx_queue.prev;
125 if (!skb_queue_empty(&priv->tx_queue)) {
126 info = IEEE80211_SKB_CB(target_skb);
127 range = (void *)info->rate_driver_data;
128 target_addr = range->end_addr;
129 }
130 } else {
131 spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
132 return -ENOSPC;
133 }
134 }
135
136 info = IEEE80211_SKB_CB(skb);
137 range = (void *) info->rate_driver_data;
138 range->start_addr = target_addr;
139 range->end_addr = target_addr + len;
46df10ae
CL		 140 data->req_id = cpu_to_le32(target_addr + priv->headroom);
141 if (IS_DATA_FRAME(skb) &&
142 unlikely(GET_HW_QUEUE(skb) == P54_QUEUE_BEACON))
143 priv->beacon_req_id = data->req_id;
144
0a5fb84f
CL		 145 __skb_queue_after(&priv->tx_queue, target_skb, skb);
146 spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
0a5fb84f
CL		 147 return 0;
148}
149
150static void p54_tx_pending(struct p54_common *priv)
151{
152 struct sk_buff *skb;
153 int ret;
154
0a5fb84f
CL		 155 skb = skb_dequeue(&priv->tx_pending);
156 if (unlikely(!skb))
157 return ;
158
159 ret = p54_assign_address(priv, skb);
160 if (unlikely(ret))
161 skb_queue_head(&priv->tx_pending, skb);
162 else
163 priv->tx(priv->hw, skb);
164}
165
166static void p54_wake_queues(struct p54_common *priv)
167{
168 unsigned long flags;
169 unsigned int i;
170
171 if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
172 return ;
173
174 p54_tx_pending(priv);
175
176 spin_lock_irqsave(&priv->tx_stats_lock, flags);
177 for (i = 0; i < priv->hw->queues; i++) {
178 if (priv->tx_stats[i + P54_QUEUE_DATA].len <
179 priv->tx_stats[i + P54_QUEUE_DATA].limit)
180 ieee80211_wake_queue(priv->hw, i);
181 }
182 spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
183}
184
185static int p54_tx_qos_accounting_alloc(struct p54_common *priv,
186 struct sk_buff *skb,
187 const u16 p54_queue)
188{
97e93fcd 189 struct p54_tx_queue_stats *queue;
0a5fb84f
CL		 190 unsigned long flags;
191
088ea189 192 if (WARN_ON(p54_queue >= P54_QUEUE_NUM))
0a5fb84f
CL		 193 return -EINVAL;
194
195 queue = &priv->tx_stats[p54_queue];
196
197 spin_lock_irqsave(&priv->tx_stats_lock, flags);
2ffa5fed 198 if (unlikely(queue->len >= queue->limit && IS_QOS_QUEUE(p54_queue))) {
0a5fb84f
CL		 199 spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
200 return -ENOSPC;
201 }
202
203 queue->len++;
204 queue->count++;
205
206 if (unlikely(queue->len == queue->limit && IS_QOS_QUEUE(p54_queue))) {
207 u16 ac_queue = p54_queue - P54_QUEUE_DATA;
208 ieee80211_stop_queue(priv->hw, ac_queue);
209 }
210
211 spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
212 return 0;
213}
214
215static void p54_tx_qos_accounting_free(struct p54_common *priv,
216 struct sk_buff *skb)
217{
12f49a79 218 if (IS_DATA_FRAME(skb)) {
2ffa5fed 219 unsigned long flags;
0a5fb84f 220
2ffa5fed 221 spin_lock_irqsave(&priv->tx_stats_lock, flags);
46df10ae 222 priv->tx_stats[GET_HW_QUEUE(skb)].len--;
2ffa5fed 223 spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
46df10ae
CL		 224
225 if (unlikely(GET_HW_QUEUE(skb) == P54_QUEUE_BEACON)) {
226 if (priv->beacon_req_id == GET_REQ_ID(skb)) {
227 /* this is the active beacon set anymore */
228 priv->beacon_req_id = 0;
229 }
230 complete(&priv->beacon_comp);
231 }
0a5fb84f
CL		 232 }
233 p54_wake_queues(priv);
234}
235
236void p54_free_skb(struct ieee80211_hw *dev, struct sk_buff *skb)
237{
238 struct p54_common *priv = dev->priv;
239 if (unlikely(!skb))
240 return ;
241
242 skb_unlink(skb, &priv->tx_queue);
243 p54_tx_qos_accounting_free(priv, skb);
c3745b40 244 ieee80211_free_txskb(dev, skb);
0a5fb84f
CL		 245}
246EXPORT_SYMBOL_GPL(p54_free_skb);
247
248static struct sk_buff *p54_find_and_unlink_skb(struct p54_common *priv,
249 const __le32 req_id)
250{
251 struct sk_buff *entry;
252 unsigned long flags;
253
254 spin_lock_irqsave(&priv->tx_queue.lock, flags);
255 skb_queue_walk(&priv->tx_queue, entry) {
256 struct p54_hdr *hdr = (struct p54_hdr *) entry->data;
257
258 if (hdr->req_id == req_id) {
259 __skb_unlink(entry, &priv->tx_queue);
260 spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
261 p54_tx_qos_accounting_free(priv, entry);
262 return entry;
263 }
264 }
265 spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
266 return NULL;
267}
268
269void p54_tx(struct p54_common *priv, struct sk_buff *skb)
270{
0a5fb84f
CL		 271 skb_queue_tail(&priv->tx_pending, skb);
272 p54_tx_pending(priv);
273}
274
275static int p54_rssi_to_dbm(struct p54_common *priv, int rssi)
276{
45f7e311 277 if (priv->rxhw != 5) {
7a047f4f
CL		 278 return ((rssi * priv->cur_rssi->mul) / 64 +
279 priv->cur_rssi->add) / 4;
45f7e311 280 } else {
0a5fb84f
CL		 281 /*
282 * TODO: find the correct formula
283 */
45f7e311
CL		 284 return rssi / 2 - 110;
285 }
0a5fb84f
CL		 286}
287
e0f114e8
CL		 288/*
289 * Even if the firmware is capable of dealing with incoming traffic,
290 * while dozing, we have to prepared in case mac80211 uses PS-POLL
291 * to retrieve outstanding frames from our AP.
292 * (see comment in net/mac80211/mlme.c @ line 1993)
293 */
294static void p54_pspoll_workaround(struct p54_common *priv, struct sk_buff *skb)
295{
296 struct ieee80211_hdr *hdr = (void *) skb->data;
297 struct ieee80211_tim_ie *tim_ie;
298 u8 *tim;
299 u8 tim_len;
300 bool new_psm;
301
302 /* only beacons have a TIM IE */
303 if (!ieee80211_is_beacon(hdr->frame_control))
304 return;
305
306 if (!priv->aid)
307 return;
308
309 /* only consider beacons from the associated BSSID */
4d2a33e1 310 if (!ether_addr_equal_64bits(hdr->addr3, priv->bssid))
e0f114e8
CL		 311 return;
312
313 tim = p54_find_ie(skb, WLAN_EID_TIM);
314 if (!tim)
315 return;
316
317 tim_len = tim[1];
318 tim_ie = (struct ieee80211_tim_ie *) &tim[2];
319
320 new_psm = ieee80211_check_tim(tim_ie, tim_len, priv->aid);
321 if (new_psm != priv->powersave_override) {
322 priv->powersave_override = new_psm;
323 p54_set_ps(priv);
324 }
325}
326
0a5fb84f
CL		 327static int p54_rx_data(struct p54_common *priv, struct sk_buff *skb)
328{
329 struct p54_rx_data *hdr = (struct p54_rx_data *) skb->data;
330 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
331 u16 freq = le16_to_cpu(hdr->freq);
332 size_t header_len = sizeof(*hdr);
333 u32 tsf32;
334 u8 rate = hdr->rate & 0xf;
335
336 /*
337 * If the device is in a unspecified state we have to
338 * ignore all data frames. Else we could end up with a
339 * nasty crash.
340 */
341 if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
342 return 0;
343
344 if (!(hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_IN_FCS_GOOD)))
345 return 0;
346
347 if (hdr->decrypt_status == P54_DECRYPT_OK)
348 rx_status->flag |= RX_FLAG_DECRYPTED;
349 if ((hdr->decrypt_status == P54_DECRYPT_FAIL_MICHAEL) ||
350 (hdr->decrypt_status == P54_DECRYPT_FAIL_TKIP))
351 rx_status->flag |= RX_FLAG_MMIC_ERROR;
352
353 rx_status->signal = p54_rssi_to_dbm(priv, hdr->rssi);
0a5fb84f
CL		 354 if (hdr->rate & 0x10)
355 rx_status->flag |= RX_FLAG_SHORTPRE;
675a0b04 356 if (priv->hw->conf.chandef.chan->band == IEEE80211_BAND_5GHZ)
0a5fb84f
CL		 357 rx_status->rate_idx = (rate < 4) ? 0 : rate - 4;
358 else
359 rx_status->rate_idx = rate;
360
361 rx_status->freq = freq;
675a0b04 362 rx_status->band = priv->hw->conf.chandef.chan->band;
0a5fb84f
CL		 363 rx_status->antenna = hdr->antenna;
364
365 tsf32 = le32_to_cpu(hdr->tsf32);
366 if (tsf32 < priv->tsf_low32)
367 priv->tsf_high32++;
368 rx_status->mactime = ((u64)priv->tsf_high32) << 32 | tsf32;
369 priv->tsf_low32 = tsf32;
370
725d255e
CL		 371 /* LMAC API Page 10/29 - s_lm_data_in - clock
372 * "usec accurate timestamp of hardware clock
373 * at end of frame (before OFDM SIFS EOF padding"
374 */
375 rx_status->flag |= RX_FLAG_MACTIME_END;
0a5fb84f
CL		 376
377 if (hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
378 header_len += hdr->align[0];
379
380 skb_pull(skb, header_len);
381 skb_trim(skb, le16_to_cpu(hdr->len));
e0f114e8
CL		 382 if (unlikely(priv->hw->conf.flags & IEEE80211_CONF_PS))
383 p54_pspoll_workaround(priv, skb);
384
0a5fb84f
CL		 385 ieee80211_rx_irqsafe(priv->hw, skb);
386
42935eca 387 ieee80211_queue_delayed_work(priv->hw, &priv->work,
0a5fb84f
CL		 388 msecs_to_jiffies(P54_STATISTICS_UPDATE));
389
390 return -1;
391}
392
393static void p54_rx_frame_sent(struct p54_common *priv, struct sk_buff *skb)
394{
395 struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
396 struct p54_frame_sent *payload = (struct p54_frame_sent *) hdr->data;
397 struct ieee80211_tx_info *info;
398 struct p54_hdr *entry_hdr;
399 struct p54_tx_data *entry_data;
400 struct sk_buff *entry;
401 unsigned int pad = 0, frame_len;
402 int count, idx;
403
404 entry = p54_find_and_unlink_skb(priv, hdr->req_id);
405 if (unlikely(!entry))
406 return ;
407
408 frame_len = entry->len;
409 info = IEEE80211_SKB_CB(entry);
410 entry_hdr = (struct p54_hdr *) entry->data;
411 entry_data = (struct p54_tx_data *) entry_hdr->data;
412 priv->stats.dot11ACKFailureCount += payload->tries - 1;
413
414 /*
415 * Frames in P54_QUEUE_FWSCAN and P54_QUEUE_BEACON are
416 * generated by the driver. Therefore tx_status is bogus
417 * and we don't want to confuse the mac80211 stack.
418 */
419 if (unlikely(entry_data->hw_queue < P54_QUEUE_FWSCAN)) {
0a5fb84f
CL		 420 dev_kfree_skb_any(entry);
421 return ;
422 }
423
424 /*
425 * Clear manually, ieee80211_tx_info_clear_status would
426 * clear the counts too and we need them.
427 */
e3e1a0bc 428 memset(&info->status.ack_signal, 0,
0a5fb84f 429 sizeof(struct ieee80211_tx_info) -
e3e1a0bc 430 offsetof(struct ieee80211_tx_info, status.ack_signal));
0a5fb84f 431 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info,
e3e1a0bc 432 status.ack_signal) != 20);
0a5fb84f
CL		 433
434 if (entry_hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
435 pad = entry_data->align[0];
436
437 /* walk through the rates array and adjust the counts */
438 count = payload->tries;
439 for (idx = 0; idx < 4; idx++) {
440 if (count >= info->status.rates[idx].count) {
441 count -= info->status.rates[idx].count;
442 } else if (count > 0) {
443 info->status.rates[idx].count = count;
444 count = 0;
445 } else {
446 info->status.rates[idx].idx = -1;
447 info->status.rates[idx].count = 0;
448 }
449 }
450
451 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
f880c205 452 !(payload->status & P54_TX_FAILED))
0a5fb84f
CL		 453 info->flags |= IEEE80211_TX_STAT_ACK;
454 if (payload->status & P54_TX_PSM_CANCELLED)
455 info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
456 info->status.ack_signal = p54_rssi_to_dbm(priv,
457 (int)payload->ack_rssi);
458
459 /* Undo all changes to the frame. */
460 switch (entry_data->key_type) {
461 case P54_CRYPTO_TKIPMICHAEL: {
462 u8 *iv = (u8 *)(entry_data->align + pad +
463 entry_data->crypt_offset);
464
465 /* Restore the original TKIP IV. */
466 iv[2] = iv[0];
467 iv[0] = iv[1];
468 iv[1] = (iv[0] | 0x20) & 0x7f; /* WEPSeed - 8.3.2.2 */
469
470 frame_len -= 12; /* remove TKIP_MMIC + TKIP_ICV */
471 break;
472 }
473 case P54_CRYPTO_AESCCMP:
474 frame_len -= 8; /* remove CCMP_MIC */
475 break;
476 case P54_CRYPTO_WEP:
477 frame_len -= 4; /* remove WEP_ICV */
478 break;
479 }
480
481 skb_trim(entry, frame_len);
482 skb_pull(entry, sizeof(*hdr) + pad + sizeof(*entry_data));
483 ieee80211_tx_status_irqsafe(priv->hw, entry);
484}
485
486static void p54_rx_eeprom_readback(struct p54_common *priv,
487 struct sk_buff *skb)
488{
489 struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
490 struct p54_eeprom_lm86 *eeprom = (struct p54_eeprom_lm86 *) hdr->data;
491 struct sk_buff *tmp;
492
493 if (!priv->eeprom)
494 return ;
495
496 if (priv->fw_var >= 0x509) {
497 memcpy(priv->eeprom, eeprom->v2.data,
498 le16_to_cpu(eeprom->v2.len));
499 } else {
500 memcpy(priv->eeprom, eeprom->v1.data,
501 le16_to_cpu(eeprom->v1.len));
502 }
503
504 priv->eeprom = NULL;
505 tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
0a5fb84f
CL		 506 dev_kfree_skb_any(tmp);
507 complete(&priv->eeprom_comp);
508}
509
510static void p54_rx_stats(struct p54_common *priv, struct sk_buff *skb)
511{
512 struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
513 struct p54_statistics *stats = (struct p54_statistics *) hdr->data;
514 struct sk_buff *tmp;
0d78156e
CL		 515 struct ieee80211_channel *chan;
516 unsigned int i, rssi, tx, cca, dtime, dtotal, dcca, dtx, drssi, unit;
0a5fb84f
CL		 517 u32 tsf32;
518
519 if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
520 return ;
521
522 tsf32 = le32_to_cpu(stats->tsf32);
523 if (tsf32 < priv->tsf_low32)
524 priv->tsf_high32++;
525 priv->tsf_low32 = tsf32;
526
527 priv->stats.dot11RTSFailureCount = le32_to_cpu(stats->rts_fail);
528 priv->stats.dot11RTSSuccessCount = le32_to_cpu(stats->rts_success);
529 priv->stats.dot11FCSErrorCount = le32_to_cpu(stats->rx_bad_fcs);
530
531 priv->noise = p54_rssi_to_dbm(priv, le32_to_cpu(stats->noise));
532
0d78156e
CL		 533 /*
534 * STSW450X LMAC API page 26 - 3.8 Statistics
535 * "The exact measurement period can be derived from the
536 * timestamp member".
537 */
538 dtime = tsf32 - priv->survey_raw.timestamp;
539
540 /*
541 * STSW450X LMAC API page 26 - 3.8.1 Noise histogram
542 * The LMAC samples RSSI, CCA and transmit state at regular
543 * periods (typically 8 times per 1k [as in 1024] usec).
544 */
545 cca = le32_to_cpu(stats->sample_cca);
546 tx = le32_to_cpu(stats->sample_tx);
547 rssi = 0;
548 for (i = 0; i < ARRAY_SIZE(stats->sample_noise); i++)
549 rssi += le32_to_cpu(stats->sample_noise[i]);
550
551 dcca = cca - priv->survey_raw.cached_cca;
552 drssi = rssi - priv->survey_raw.cached_rssi;
553 dtx = tx - priv->survey_raw.cached_tx;
554 dtotal = dcca + drssi + dtx;
555
556 /*
557 * update statistics when more than a second is over since the
558 * last call, or when a update is badly needed.
559 */
560 if (dtotal && (priv->update_stats || dtime >= USEC_PER_SEC) &&
561 dtime >= dtotal) {
562 priv->survey_raw.timestamp = tsf32;
563 priv->update_stats = false;
564 unit = dtime / dtotal;
565
566 if (dcca) {
567 priv->survey_raw.cca += dcca * unit;
568 priv->survey_raw.cached_cca = cca;
569 }
570 if (dtx) {
571 priv->survey_raw.tx += dtx * unit;
572 priv->survey_raw.cached_tx = tx;
573 }
574 if (drssi) {
575 priv->survey_raw.rssi += drssi * unit;
576 priv->survey_raw.cached_rssi = rssi;
577 }
578
579 /* 1024 usec / 8 times = 128 usec / time */
580 if (!(priv->phy_ps || priv->phy_idle))
581 priv->survey_raw.active += dtotal * unit;
582 else
583 priv->survey_raw.active += (dcca + dtx) * unit;
584 }
585
586 chan = priv->curchan;
587 if (chan) {
588 struct survey_info *survey = &priv->survey[chan->hw_value];
608cfbe4 589 survey->noise = clamp(priv->noise, -128, 127);
4ed20beb
JB		 590 survey->time = priv->survey_raw.active;
591 survey->time_tx = priv->survey_raw.tx;
592 survey->time_busy = priv->survey_raw.tx +
1cda0fd6 593 priv->survey_raw.cca;
4ed20beb
JB		 594 do_div(survey->time, 1024);
595 do_div(survey->time_tx, 1024);
596 do_div(survey->time_busy, 1024);
0d78156e
CL		 597 }
598
0a5fb84f 599 tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
0a5fb84f 600 dev_kfree_skb_any(tmp);
0d78156e 601 complete(&priv->stat_comp);
0a5fb84f
CL		 602}
603
604static void p54_rx_trap(struct p54_common *priv, struct sk_buff *skb)
605{
606 struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
607 struct p54_trap *trap = (struct p54_trap *) hdr->data;
608 u16 event = le16_to_cpu(trap->event);
609 u16 freq = le16_to_cpu(trap->frequency);
610
611 switch (event) {
612 case P54_TRAP_BEACON_TX:
613 break;
614 case P54_TRAP_RADAR:
5db55844 615 wiphy_info(priv->hw->wiphy, "radar (freq:%d MHz)\n", freq);
0a5fb84f
CL		 616 break;
617 case P54_TRAP_NO_BEACON:
618 if (priv->vif)
619 ieee80211_beacon_loss(priv->vif);
620 break;
621 case P54_TRAP_SCAN:
622 break;
623 case P54_TRAP_TBTT:
624 break;
625 case P54_TRAP_TIMER:
626 break;
6208f8b2
CL		 627 case P54_TRAP_FAA_RADIO_OFF:
628 wiphy_rfkill_set_hw_state(priv->hw->wiphy, true);
629 break;
630 case P54_TRAP_FAA_RADIO_ON:
631 wiphy_rfkill_set_hw_state(priv->hw->wiphy, false);
632 break;
0a5fb84f 633 default:
c96c31e4
JP		 634 wiphy_info(priv->hw->wiphy, "received event:%x freq:%d\n",
635 event, freq);
0a5fb84f
CL		 636 break;
637 }
638}
639
640static int p54_rx_control(struct p54_common *priv, struct sk_buff *skb)
641{
642 struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
643
644 switch (le16_to_cpu(hdr->type)) {
645 case P54_CONTROL_TYPE_TXDONE:
646 p54_rx_frame_sent(priv, skb);
647 break;
648 case P54_CONTROL_TYPE_TRAP:
649 p54_rx_trap(priv, skb);
650 break;
651 case P54_CONTROL_TYPE_BBP:
652 break;
653 case P54_CONTROL_TYPE_STAT_READBACK:
654 p54_rx_stats(priv, skb);
655 break;
656 case P54_CONTROL_TYPE_EEPROM_READBACK:
657 p54_rx_eeprom_readback(priv, skb);
658 break;
659 default:
c96c31e4
JP		 660 wiphy_debug(priv->hw->wiphy,
661 "not handling 0x%02x type control frame\n",
662 le16_to_cpu(hdr->type));
0a5fb84f
CL		 663 break;
664 }
665 return 0;
666}
667
668/* returns zero if skb can be reused */
669int p54_rx(struct ieee80211_hw *dev, struct sk_buff *skb)
670{
671 struct p54_common *priv = dev->priv;
672 u16 type = le16_to_cpu(*((__le16 *)skb->data));
673
674 if (type & P54_HDR_FLAG_CONTROL)
675 return p54_rx_control(priv, skb);
676 else
677 return p54_rx_data(priv, skb);
678}
679EXPORT_SYMBOL_GPL(p54_rx);
680
681static void p54_tx_80211_header(struct p54_common *priv, struct sk_buff *skb,
36323f81
TH		 682 struct ieee80211_tx_info *info,
683 struct ieee80211_sta *sta,
684 u8 *queue, u32 *extra_len, u16 *flags, u16 *aid,
0a5fb84f
CL		 685 bool *burst_possible)
686{
687 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
688
689 if (ieee80211_is_data_qos(hdr->frame_control))
690 *burst_possible = true;
691 else
692 *burst_possible = false;
693
3b5c5827 694 if (!(info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ))
0a5fb84f
CL		 695 *flags |= P54_HDR_FLAG_DATA_OUT_SEQNR;
696
02f2f1a9 697 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER)
0a5fb84f
CL		 698 *flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL;
699
90d6f928
CL		 700 if (info->flags & IEEE80211_TX_CTL_CLEAR_PS_FILT)
701 *flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL;
702
0a5fb84f
CL		 703 *queue = skb_get_queue_mapping(skb) + P54_QUEUE_DATA;
704
705 switch (priv->mode) {
706 case NL80211_IFTYPE_MONITOR:
707 /*
708 * We have to set P54_HDR_FLAG_DATA_OUT_PROMISC for
709 * every frame in promiscuous/monitor mode.
710 * see STSW45x0C LMAC API - page 12.
711 */
712 *aid = 0;
713 *flags |= P54_HDR_FLAG_DATA_OUT_PROMISC;
714 break;
715 case NL80211_IFTYPE_STATION:
716 *aid = 1;
717 break;
718 case NL80211_IFTYPE_AP:
719 case NL80211_IFTYPE_ADHOC:
720 case NL80211_IFTYPE_MESH_POINT:
721 if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
722 *aid = 0;
723 *queue = P54_QUEUE_CAB;
724 return;
725 }
726
727 if (unlikely(ieee80211_is_mgmt(hdr->frame_control))) {
728 if (ieee80211_is_probe_resp(hdr->frame_control)) {
729 *aid = 0;
730 *flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP |
731 P54_HDR_FLAG_DATA_OUT_NOCANCEL;
732 return;
733 } else if (ieee80211_is_beacon(hdr->frame_control)) {
734 *aid = 0;
735
736 if (info->flags & IEEE80211_TX_CTL_INJECTED) {
737 /*
738 * Injecting beacons on top of a AP is
739 * not a good idea... nevertheless,
740 * it should be doable.
741 */
742
743 return;
744 }
745
746 *flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP;
747 *queue = P54_QUEUE_BEACON;
748 *extra_len = IEEE80211_MAX_TIM_LEN;
749 return;
750 }
751 }
752
36323f81
TH		 753 if (sta)
754 *aid = sta->aid;
0a5fb84f
CL		 755 break;
756 }
757}
758
97359d12 759static u8 p54_convert_algo(u32 cipher)
0a5fb84f 760{
97359d12
JB		 761 switch (cipher) {
762 case WLAN_CIPHER_SUITE_WEP40:
763 case WLAN_CIPHER_SUITE_WEP104:
0a5fb84f 764 return P54_CRYPTO_WEP;
97359d12 765 case WLAN_CIPHER_SUITE_TKIP:
0a5fb84f 766 return P54_CRYPTO_TKIPMICHAEL;
97359d12 767 case WLAN_CIPHER_SUITE_CCMP:
0a5fb84f
CL		 768 return P54_CRYPTO_AESCCMP;
769 default:
770 return 0;
771 }
772}
773
36323f81
TH		 774void p54_tx_80211(struct ieee80211_hw *dev,
775 struct ieee80211_tx_control *control,
776 struct sk_buff *skb)
0a5fb84f
CL		 777{
778 struct p54_common *priv = dev->priv;
779 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
780 struct p54_tx_info *p54info;
781 struct p54_hdr *hdr;
782 struct p54_tx_data *txhdr;
a6756da9 783 unsigned int padding, len, extra_len = 0;
0a5fb84f
CL		 784 int i, j, ridx;
785 u16 hdr_flags = 0, aid = 0;
786 u8 rate, queue = 0, crypt_offset = 0;
787 u8 cts_rate = 0x20;
788 u8 rc_flags;
789 u8 calculated_tries[4];
790 u8 nrates = 0, nremaining = 8;
791 bool burst_allowed = false;
792
36323f81 793 p54_tx_80211_header(priv, skb, info, control->sta, &queue, &extra_len,
0a5fb84f
CL		 794 &hdr_flags, &aid, &burst_allowed);
795
796 if (p54_tx_qos_accounting_alloc(priv, skb, queue)) {
c3745b40 797 ieee80211_free_txskb(dev, skb);
7bb45683 798 return;
0a5fb84f
CL		 799 }
800
801 padding = (unsigned long)(skb->data - (sizeof(*hdr) + sizeof(*txhdr))) & 3;
802 len = skb->len;
803
804 if (info->control.hw_key) {
805 crypt_offset = ieee80211_get_hdrlen_from_skb(skb);
97359d12 806 if (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
0a5fb84f
CL		 807 u8 *iv = (u8 *)(skb->data + crypt_offset);
808 /*
809 * The firmware excepts that the IV has to have
810 * this special format
811 */
812 iv[1] = iv[0];
813 iv[0] = iv[2];
814 iv[2] = 0;
815 }
816 }
817
818 txhdr = (struct p54_tx_data *) skb_push(skb, sizeof(*txhdr) + padding);
819 hdr = (struct p54_hdr *) skb_push(skb, sizeof(*hdr));
820
821 if (padding)
822 hdr_flags |= P54_HDR_FLAG_DATA_ALIGN;
823 hdr->type = cpu_to_le16(aid);
824 hdr->rts_tries = info->control.rates[0].count;
825
826 /*
827 * we register the rates in perfect order, and
828 * RTS/CTS won't happen on 5 GHz
829 */
830 cts_rate = info->control.rts_cts_rate_idx;
831
832 memset(&txhdr->rateset, 0, sizeof(txhdr->rateset));
833
834 /* see how many rates got used */
835 for (i = 0; i < dev->max_rates; i++) {
836 if (info->control.rates[i].idx < 0)
837 break;
838 nrates++;
839 }
840
841 /* limit tries to 8/nrates per rate */
842 for (i = 0; i < nrates; i++) {
843 /*
844 * The magic expression here is equivalent to 8/nrates for
845 * all values that matter, but avoids division and jumps.
846 * Note that nrates can only take the values 1 through 4.
847 */
848 calculated_tries[i] = min_t(int, ((15 >> nrates) | 1) + 1,
849 info->control.rates[i].count);
850 nremaining -= calculated_tries[i];
851 }
852
853 /* if there are tries left, distribute from back to front */
854 for (i = nrates - 1; nremaining > 0 && i >= 0; i--) {
855 int tmp = info->control.rates[i].count - calculated_tries[i];
856
857 if (tmp <= 0)
858 continue;
859 /* RC requested more tries at this rate */
860
861 tmp = min_t(int, tmp, nremaining);
862 calculated_tries[i] += tmp;
863 nremaining -= tmp;
864 }
865
866 ridx = 0;
867 for (i = 0; i < nrates && ridx < 8; i++) {
868 /* we register the rates in perfect order */
869 rate = info->control.rates[i].idx;
870 if (info->band == IEEE80211_BAND_5GHZ)
871 rate += 4;
872
873 /* store the count we actually calculated for TX status */
874 info->control.rates[i].count = calculated_tries[i];
875
876 rc_flags = info->control.rates[i].flags;
877 if (rc_flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) {
878 rate |= 0x10;
879 cts_rate |= 0x10;
880 }
881 if (rc_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
882 burst_allowed = false;
883 rate |= 0x40;
884 } else if (rc_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
885 rate |= 0x20;
886 burst_allowed = false;
887 }
888 for (j = 0; j < calculated_tries[i] && ridx < 8; j++) {
889 txhdr->rateset[ridx] = rate;
890 ridx++;
891 }
892 }
893
894 if (burst_allowed)
895 hdr_flags |= P54_HDR_FLAG_DATA_OUT_BURST;
896
897 /* TODO: enable bursting */
898 hdr->flags = cpu_to_le16(hdr_flags);
899 hdr->tries = ridx;
900 txhdr->rts_rate_idx = 0;
901 if (info->control.hw_key) {
97359d12 902 txhdr->key_type = p54_convert_algo(info->control.hw_key->cipher);
0a5fb84f
CL		 903 txhdr->key_len = min((u8)16, info->control.hw_key->keylen);
904 memcpy(txhdr->key, info->control.hw_key->key, txhdr->key_len);
97359d12 905 if (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
0a5fb84f
CL		 906 /* reserve space for the MIC key */
907 len += 8;
908 memcpy(skb_put(skb, 8), &(info->control.hw_key->key
909 [NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]), 8);
910 }
911 /* reserve some space for ICV */
912 len += info->control.hw_key->icv_len;
913 memset(skb_put(skb, info->control.hw_key->icv_len), 0,
914 info->control.hw_key->icv_len);
915 } else {
916 txhdr->key_type = 0;
917 txhdr->key_len = 0;
918 }
919 txhdr->crypt_offset = crypt_offset;
920 txhdr->hw_queue = queue;
921 txhdr->backlog = priv->tx_stats[queue].len - 1;
922 memset(txhdr->durations, 0, sizeof(txhdr->durations));
d748b464 923 txhdr->tx_antenna = 2 & priv->tx_diversity_mask;
0a5fb84f
CL		 924 if (priv->rxhw == 5) {
925 txhdr->longbow.cts_rate = cts_rate;
926 txhdr->longbow.output_power = cpu_to_le16(priv->output_power);
927 } else {
928 txhdr->normal.output_power = priv->output_power;
929 txhdr->normal.cts_rate = cts_rate;
930 }
931 if (padding)
932 txhdr->align[0] = padding;
933
934 hdr->len = cpu_to_le16(len);
935 /* modifies skb->cb and with it info, so must be last! */
936 p54info = (void *) info->rate_driver_data;
937 p54info->extra_len = extra_len;
938
939 p54_tx(priv, skb);
0a5fb84f 940}
Linux 6.x block layer and io_uring tree(s)