1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Common 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/export.h>
17 #include <linux/firmware.h>
18 #include <linux/etherdevice.h>
19 #include <asm/div64.h>
20 
21 #include <net/mac80211.h>
22 
23 #include "p54.h"
24 #include "lmac.h"
25 
26 #ifdef P54_MM_DEBUG
27 static void p54_dump_tx_queue(struct p54_common *priv)
28 {
29 	unsigned long flags;
30 	struct ieee80211_tx_info *info;
31 	struct p54_tx_info *range;
32 	struct sk_buff *skb;
33 	struct p54_hdr *hdr;
34 	unsigned int i = 0;
35 	u32 prev_addr;
36 	u32 largest_hole = 0, free;
37 
38 	spin_lock_irqsave(&priv->tx_queue.lock, flags);
39 	wiphy_debug(priv->hw->wiphy, "/ --- tx queue dump (%d entries) ---\n",
40 		    skb_queue_len(&priv->tx_queue));
41 
42 	prev_addr = priv->rx_start;
43 	skb_queue_walk(&priv->tx_queue, skb) {
44 		info = IEEE80211_SKB_CB(skb);
45 		range = (void *) info->rate_driver_data;
46 		hdr = (void *) skb->data;
47 
48 		free = range->start_addr - prev_addr;
49 		wiphy_debug(priv->hw->wiphy,
50 			    "| [%02d] => [skb:%p skb_len:0x%04x "
51 			    "hdr:{flags:%02x len:%04x req_id:%04x type:%02x} "
52 			    "mem:{start:%04x end:%04x, free:%d}]\n",
53 			    i++, skb, skb->len,
54 			    le16_to_cpu(hdr->flags), le16_to_cpu(hdr->len),
55 			    le32_to_cpu(hdr->req_id), le16_to_cpu(hdr->type),
56 			    range->start_addr, range->end_addr, free);
57 
58 		prev_addr = range->end_addr;
59 		largest_hole = max(largest_hole, free);
60 	}
61 	free = priv->rx_end - prev_addr;
62 	largest_hole = max(largest_hole, free);
63 	wiphy_debug(priv->hw->wiphy,
64 		    "\\ --- [free: %d], largest free block: %d ---\n",
65 		    free, largest_hole);
66 	spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
67 }
68 #endif /* P54_MM_DEBUG */
69 
70 /*
71  * So, the firmware is somewhat stupid and doesn't know what places in its
72  * memory incoming data should go to. By poking around in the firmware, we
73  * can find some unused memory to upload our packets to. However, data that we
74  * want the card to TX needs to stay intact until the card has told us that
75  * it is done with it. This function finds empty places we can upload to and
76  * marks allocated areas as reserved if necessary. p54_find_and_unlink_skb or
77  * p54_free_skb frees allocated areas.
78  */
79 static int p54_assign_address(struct p54_common *priv, struct sk_buff *skb)
80 {
81 	struct sk_buff *entry, *target_skb = NULL;
82 	struct ieee80211_tx_info *info;
83 	struct p54_tx_info *range;
84 	struct p54_hdr *data = (void *) skb->data;
85 	unsigned long flags;
86 	u32 last_addr = priv->rx_start;
87 	u32 target_addr = priv->rx_start;
88 	u16 len = priv->headroom + skb->len + priv->tailroom + 3;
89 
90 	info = IEEE80211_SKB_CB(skb);
91 	range = (void *) info->rate_driver_data;
92 	len = (range->extra_len + len) & ~0x3;
93 
94 	spin_lock_irqsave(&priv->tx_queue.lock, flags);
95 	if (unlikely(skb_queue_len(&priv->tx_queue) == 32)) {
96 		/*
97 		 * The tx_queue is now really full.
98 		 *
99 		 * TODO: check if the device has crashed and reset it.
100 		 */
101 		spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
102 		return -EBUSY;
103 	}
104 
105 	skb_queue_walk(&priv->tx_queue, entry) {
106 		u32 hole_size;
107 		info = IEEE80211_SKB_CB(entry);
108 		range = (void *) info->rate_driver_data;
109 		hole_size = range->start_addr - last_addr;
110 
111 		if (!target_skb && hole_size >= len) {
112 			target_skb = entry->prev;
113 			hole_size -= len;
114 			target_addr = last_addr;
115 			break;
116 		}
117 		last_addr = range->end_addr;
118 	}
119 	if (unlikely(!target_skb)) {
120 		if (priv->rx_end - last_addr >= len) {
121 			target_skb = skb_peek_tail(&priv->tx_queue);
122 			if (target_skb) {
123 				info = IEEE80211_SKB_CB(target_skb);
124 				range = (void *)info->rate_driver_data;
125 				target_addr = range->end_addr;
126 			}
127 		} else {
128 			spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
129 			return -ENOSPC;
130 		}
131 	}
132 
133 	info = IEEE80211_SKB_CB(skb);
134 	range = (void *) info->rate_driver_data;
135 	range->start_addr = target_addr;
136 	range->end_addr = target_addr + len;
137 	data->req_id = cpu_to_le32(target_addr + priv->headroom);
138 	if (IS_DATA_FRAME(skb) &&
139 	    unlikely(GET_HW_QUEUE(skb) == P54_QUEUE_BEACON))
140 		priv->beacon_req_id = data->req_id;
141 
142 	if (target_skb)
143 		__skb_queue_after(&priv->tx_queue, target_skb, skb);
144 	else
145 		__skb_queue_head(&priv->tx_queue, skb);
146 	spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
147 	return 0;
148 }
149 
150 static void p54_tx_pending(struct p54_common *priv)
151 {
152 	struct sk_buff *skb;
153 	int ret;
154 
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 
166 static 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 
185 static int p54_tx_qos_accounting_alloc(struct p54_common *priv,
186 				       struct sk_buff *skb,
187 				       const u16 p54_queue)
188 {
189 	struct p54_tx_queue_stats *queue;
190 	unsigned long flags;
191 
192 	if (WARN_ON(p54_queue >= P54_QUEUE_NUM))
193 		return -EINVAL;
194 
195 	queue = &priv->tx_stats[p54_queue];
196 
197 	spin_lock_irqsave(&priv->tx_stats_lock, flags);
198 	if (unlikely(queue->len >= queue->limit && IS_QOS_QUEUE(p54_queue))) {
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 
215 static void p54_tx_qos_accounting_free(struct p54_common *priv,
216 				       struct sk_buff *skb)
217 {
218 	if (IS_DATA_FRAME(skb)) {
219 		unsigned long flags;
220 
221 		spin_lock_irqsave(&priv->tx_stats_lock, flags);
222 		priv->tx_stats[GET_HW_QUEUE(skb)].len--;
223 		spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
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 		}
232 	}
233 	p54_wake_queues(priv);
234 }
235 
236 void 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);
244 	ieee80211_free_txskb(dev, skb);
245 }
246 EXPORT_SYMBOL_GPL(p54_free_skb);
247 
248 static 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 
269 void p54_tx(struct p54_common *priv, struct sk_buff *skb)
270 {
271 	skb_queue_tail(&priv->tx_pending, skb);
272 	p54_tx_pending(priv);
273 }
274 
275 static int p54_rssi_to_dbm(struct p54_common *priv, int rssi)
276 {
277 	if (priv->rxhw != 5) {
278 		return ((rssi * priv->cur_rssi->mul) / 64 +
279 			 priv->cur_rssi->add) / 4;
280 	} else {
281 		/*
282 		 * TODO: find the correct formula
283 		 */
284 		return rssi / 2 - 110;
285 	}
286 }
287 
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  */
294 static 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 */
310 	if (!ether_addr_equal_64bits(hdr->addr3, priv->bssid))
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 
327 static 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 	__le16 fc;
335 	u8 rate = hdr->rate & 0xf;
336 
337 	/*
338 	 * If the device is in a unspecified state we have to
339 	 * ignore all data frames. Else we could end up with a
340 	 * nasty crash.
341 	 */
342 	if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
343 		return 0;
344 
345 	if (!(hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_IN_FCS_GOOD)))
346 		return 0;
347 
348 	if (hdr->decrypt_status == P54_DECRYPT_OK)
349 		rx_status->flag |= RX_FLAG_DECRYPTED;
350 	if ((hdr->decrypt_status == P54_DECRYPT_FAIL_MICHAEL) ||
351 	    (hdr->decrypt_status == P54_DECRYPT_FAIL_TKIP))
352 		rx_status->flag |= RX_FLAG_MMIC_ERROR;
353 
354 	rx_status->signal = p54_rssi_to_dbm(priv, hdr->rssi);
355 	if (hdr->rate & 0x10)
356 		rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
357 	if (priv->hw->conf.chandef.chan->band == NL80211_BAND_5GHZ)
358 		rx_status->rate_idx = (rate < 4) ? 0 : rate - 4;
359 	else
360 		rx_status->rate_idx = rate;
361 
362 	rx_status->freq = freq;
363 	rx_status->band =  priv->hw->conf.chandef.chan->band;
364 	rx_status->antenna = hdr->antenna;
365 
366 	tsf32 = le32_to_cpu(hdr->tsf32);
367 	if (tsf32 < priv->tsf_low32)
368 		priv->tsf_high32++;
369 	rx_status->mactime = ((u64)priv->tsf_high32) << 32 | tsf32;
370 	priv->tsf_low32 = tsf32;
371 
372 	/* LMAC API Page 10/29 - s_lm_data_in - clock
373 	 * "usec accurate timestamp of hardware clock
374 	 * at end of frame (before OFDM SIFS EOF padding"
375 	 */
376 	rx_status->flag |= RX_FLAG_MACTIME_END;
377 
378 	if (hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
379 		header_len += hdr->align[0];
380 
381 	skb_pull(skb, header_len);
382 	skb_trim(skb, le16_to_cpu(hdr->len));
383 
384 	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
385 	if (ieee80211_is_probe_resp(fc) || ieee80211_is_beacon(fc))
386 		rx_status->boottime_ns = ktime_get_boottime_ns();
387 
388 	if (unlikely(priv->hw->conf.flags & IEEE80211_CONF_PS))
389 		p54_pspoll_workaround(priv, skb);
390 
391 	ieee80211_rx_irqsafe(priv->hw, skb);
392 
393 	ieee80211_queue_delayed_work(priv->hw, &priv->work,
394 			   msecs_to_jiffies(P54_STATISTICS_UPDATE));
395 
396 	return -1;
397 }
398 
399 static void p54_rx_frame_sent(struct p54_common *priv, struct sk_buff *skb)
400 {
401 	struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
402 	struct p54_frame_sent *payload = (struct p54_frame_sent *) hdr->data;
403 	struct ieee80211_tx_info *info;
404 	struct p54_hdr *entry_hdr;
405 	struct p54_tx_data *entry_data;
406 	struct sk_buff *entry;
407 	unsigned int pad = 0, frame_len;
408 	int count, idx;
409 
410 	entry = p54_find_and_unlink_skb(priv, hdr->req_id);
411 	if (unlikely(!entry))
412 		return ;
413 
414 	frame_len = entry->len;
415 	info = IEEE80211_SKB_CB(entry);
416 	entry_hdr = (struct p54_hdr *) entry->data;
417 	entry_data = (struct p54_tx_data *) entry_hdr->data;
418 	priv->stats.dot11ACKFailureCount += payload->tries - 1;
419 
420 	/*
421 	 * Frames in P54_QUEUE_FWSCAN and P54_QUEUE_BEACON are
422 	 * generated by the driver. Therefore tx_status is bogus
423 	 * and we don't want to confuse the mac80211 stack.
424 	 */
425 	if (unlikely(entry_data->hw_queue < P54_QUEUE_FWSCAN)) {
426 		dev_kfree_skb_any(entry);
427 		return ;
428 	}
429 
430 	/*
431 	 * Clear manually, ieee80211_tx_info_clear_status would
432 	 * clear the counts too and we need them.
433 	 */
434 	memset_after(&info->status, 0, rates);
435 
436 	if (entry_hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
437 		pad = entry_data->align[0];
438 
439 	/* walk through the rates array and adjust the counts */
440 	count = payload->tries;
441 	for (idx = 0; idx < 4; idx++) {
442 		if (count >= info->status.rates[idx].count) {
443 			count -= info->status.rates[idx].count;
444 		} else if (count > 0) {
445 			info->status.rates[idx].count = count;
446 			count = 0;
447 		} else {
448 			info->status.rates[idx].idx = -1;
449 			info->status.rates[idx].count = 0;
450 		}
451 	}
452 
453 	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
454 	     !(payload->status & P54_TX_FAILED))
455 		info->flags |= IEEE80211_TX_STAT_ACK;
456 	if (payload->status & P54_TX_PSM_CANCELLED)
457 		info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
458 	info->status.ack_signal = p54_rssi_to_dbm(priv,
459 						  (int)payload->ack_rssi);
460 
461 	/* Undo all changes to the frame. */
462 	switch (entry_data->key_type) {
463 	case P54_CRYPTO_TKIPMICHAEL: {
464 		u8 *iv = (u8 *)(entry_data->align + pad +
465 				entry_data->crypt_offset);
466 
467 		/* Restore the original TKIP IV. */
468 		iv[2] = iv[0];
469 		iv[0] = iv[1];
470 		iv[1] = (iv[0] | 0x20) & 0x7f;	/* WEPSeed - 8.3.2.2 */
471 
472 		frame_len -= 12; /* remove TKIP_MMIC + TKIP_ICV */
473 		break;
474 		}
475 	case P54_CRYPTO_AESCCMP:
476 		frame_len -= 8; /* remove CCMP_MIC */
477 		break;
478 	case P54_CRYPTO_WEP:
479 		frame_len -= 4; /* remove WEP_ICV */
480 		break;
481 	}
482 
483 	skb_trim(entry, frame_len);
484 	skb_pull(entry, sizeof(*hdr) + pad + sizeof(*entry_data));
485 	ieee80211_tx_status_irqsafe(priv->hw, entry);
486 }
487 
488 static void p54_rx_eeprom_readback(struct p54_common *priv,
489 				   struct sk_buff *skb)
490 {
491 	struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
492 	struct p54_eeprom_lm86 *eeprom = (struct p54_eeprom_lm86 *) hdr->data;
493 	struct sk_buff *tmp;
494 
495 	if (!priv->eeprom)
496 		return ;
497 
498 	if (priv->fw_var >= 0x509) {
499 		memcpy(priv->eeprom, eeprom->v2.data,
500 		       le16_to_cpu(eeprom->v2.len));
501 	} else {
502 		memcpy(priv->eeprom, eeprom->v1.data,
503 		       le16_to_cpu(eeprom->v1.len));
504 	}
505 
506 	priv->eeprom = NULL;
507 	tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
508 	dev_kfree_skb_any(tmp);
509 	complete(&priv->eeprom_comp);
510 }
511 
512 static void p54_rx_stats(struct p54_common *priv, struct sk_buff *skb)
513 {
514 	struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
515 	struct p54_statistics *stats = (struct p54_statistics *) hdr->data;
516 	struct sk_buff *tmp;
517 	struct ieee80211_channel *chan;
518 	unsigned int i, rssi, tx, cca, dtime, dtotal, dcca, dtx, drssi, unit;
519 	u32 tsf32;
520 
521 	if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
522 		return ;
523 
524 	tsf32 = le32_to_cpu(stats->tsf32);
525 	if (tsf32 < priv->tsf_low32)
526 		priv->tsf_high32++;
527 	priv->tsf_low32 = tsf32;
528 
529 	priv->stats.dot11RTSFailureCount = le32_to_cpu(stats->rts_fail);
530 	priv->stats.dot11RTSSuccessCount = le32_to_cpu(stats->rts_success);
531 	priv->stats.dot11FCSErrorCount = le32_to_cpu(stats->rx_bad_fcs);
532 
533 	priv->noise = p54_rssi_to_dbm(priv, le32_to_cpu(stats->noise));
534 
535 	/*
536 	 * STSW450X LMAC API page 26 - 3.8 Statistics
537 	 * "The exact measurement period can be derived from the
538 	 * timestamp member".
539 	 */
540 	dtime = tsf32 - priv->survey_raw.timestamp;
541 
542 	/*
543 	 * STSW450X LMAC API page 26 - 3.8.1 Noise histogram
544 	 * The LMAC samples RSSI, CCA and transmit state at regular
545 	 * periods (typically 8 times per 1k [as in 1024] usec).
546 	 */
547 	cca = le32_to_cpu(stats->sample_cca);
548 	tx = le32_to_cpu(stats->sample_tx);
549 	rssi = 0;
550 	for (i = 0; i < ARRAY_SIZE(stats->sample_noise); i++)
551 		rssi += le32_to_cpu(stats->sample_noise[i]);
552 
553 	dcca = cca - priv->survey_raw.cached_cca;
554 	drssi = rssi - priv->survey_raw.cached_rssi;
555 	dtx = tx - priv->survey_raw.cached_tx;
556 	dtotal = dcca + drssi + dtx;
557 
558 	/*
559 	 * update statistics when more than a second is over since the
560 	 * last call, or when a update is badly needed.
561 	 */
562 	if (dtotal && (priv->update_stats || dtime >= USEC_PER_SEC) &&
563 	    dtime >= dtotal) {
564 		priv->survey_raw.timestamp = tsf32;
565 		priv->update_stats = false;
566 		unit = dtime / dtotal;
567 
568 		if (dcca) {
569 			priv->survey_raw.cca += dcca * unit;
570 			priv->survey_raw.cached_cca = cca;
571 		}
572 		if (dtx) {
573 			priv->survey_raw.tx += dtx * unit;
574 			priv->survey_raw.cached_tx = tx;
575 		}
576 		if (drssi) {
577 			priv->survey_raw.rssi += drssi * unit;
578 			priv->survey_raw.cached_rssi = rssi;
579 		}
580 
581 		/* 1024 usec / 8 times = 128 usec / time */
582 		if (!(priv->phy_ps || priv->phy_idle))
583 			priv->survey_raw.active += dtotal * unit;
584 		else
585 			priv->survey_raw.active += (dcca + dtx) * unit;
586 	}
587 
588 	chan = priv->curchan;
589 	if (chan) {
590 		struct survey_info *survey = &priv->survey[chan->hw_value];
591 		survey->noise = clamp(priv->noise, -128, 127);
592 		survey->time = priv->survey_raw.active;
593 		survey->time_tx = priv->survey_raw.tx;
594 		survey->time_busy = priv->survey_raw.tx +
595 			priv->survey_raw.cca;
596 		do_div(survey->time, 1024);
597 		do_div(survey->time_tx, 1024);
598 		do_div(survey->time_busy, 1024);
599 	}
600 
601 	tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
602 	dev_kfree_skb_any(tmp);
603 	complete(&priv->stat_comp);
604 }
605 
606 static void p54_rx_trap(struct p54_common *priv, struct sk_buff *skb)
607 {
608 	struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
609 	struct p54_trap *trap = (struct p54_trap *) hdr->data;
610 	u16 event = le16_to_cpu(trap->event);
611 	u16 freq = le16_to_cpu(trap->frequency);
612 
613 	switch (event) {
614 	case P54_TRAP_BEACON_TX:
615 		break;
616 	case P54_TRAP_RADAR:
617 		wiphy_info(priv->hw->wiphy, "radar (freq:%d MHz)\n", freq);
618 		break;
619 	case P54_TRAP_NO_BEACON:
620 		if (priv->vif)
621 			ieee80211_beacon_loss(priv->vif);
622 		break;
623 	case P54_TRAP_SCAN:
624 		break;
625 	case P54_TRAP_TBTT:
626 		break;
627 	case P54_TRAP_TIMER:
628 		break;
629 	case P54_TRAP_FAA_RADIO_OFF:
630 		wiphy_rfkill_set_hw_state(priv->hw->wiphy, true);
631 		break;
632 	case P54_TRAP_FAA_RADIO_ON:
633 		wiphy_rfkill_set_hw_state(priv->hw->wiphy, false);
634 		break;
635 	default:
636 		wiphy_info(priv->hw->wiphy, "received event:%x freq:%d\n",
637 			   event, freq);
638 		break;
639 	}
640 }
641 
642 static int p54_rx_control(struct p54_common *priv, struct sk_buff *skb)
643 {
644 	struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
645 
646 	switch (le16_to_cpu(hdr->type)) {
647 	case P54_CONTROL_TYPE_TXDONE:
648 		p54_rx_frame_sent(priv, skb);
649 		break;
650 	case P54_CONTROL_TYPE_TRAP:
651 		p54_rx_trap(priv, skb);
652 		break;
653 	case P54_CONTROL_TYPE_BBP:
654 		break;
655 	case P54_CONTROL_TYPE_STAT_READBACK:
656 		p54_rx_stats(priv, skb);
657 		break;
658 	case P54_CONTROL_TYPE_EEPROM_READBACK:
659 		p54_rx_eeprom_readback(priv, skb);
660 		break;
661 	default:
662 		wiphy_debug(priv->hw->wiphy,
663 			    "not handling 0x%02x type control frame\n",
664 			    le16_to_cpu(hdr->type));
665 		break;
666 	}
667 	return 0;
668 }
669 
670 /* returns zero if skb can be reused */
671 int p54_rx(struct ieee80211_hw *dev, struct sk_buff *skb)
672 {
673 	struct p54_common *priv = dev->priv;
674 	u16 type = le16_to_cpu(*((__le16 *)skb->data));
675 
676 	if (type & P54_HDR_FLAG_CONTROL)
677 		return p54_rx_control(priv, skb);
678 	else
679 		return p54_rx_data(priv, skb);
680 }
681 EXPORT_SYMBOL_GPL(p54_rx);
682 
683 static void p54_tx_80211_header(struct p54_common *priv, struct sk_buff *skb,
684 				struct ieee80211_tx_info *info,
685 				struct ieee80211_sta *sta,
686 				u8 *queue, u32 *extra_len, u16 *flags, u16 *aid,
687 				bool *burst_possible)
688 {
689 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
690 
691 	if (ieee80211_is_data_qos(hdr->frame_control))
692 		*burst_possible = true;
693 	else
694 		*burst_possible = false;
695 
696 	if (!(info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ))
697 		*flags |= P54_HDR_FLAG_DATA_OUT_SEQNR;
698 
699 	if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER)
700 		*flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL;
701 
702 	if (info->flags & IEEE80211_TX_CTL_CLEAR_PS_FILT)
703 		*flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL;
704 
705 	*queue = skb_get_queue_mapping(skb) + P54_QUEUE_DATA;
706 
707 	switch (priv->mode) {
708 	case NL80211_IFTYPE_MONITOR:
709 		/*
710 		 * We have to set P54_HDR_FLAG_DATA_OUT_PROMISC for
711 		 * every frame in promiscuous/monitor mode.
712 		 * see STSW45x0C LMAC API - page 12.
713 		 */
714 		*aid = 0;
715 		*flags |= P54_HDR_FLAG_DATA_OUT_PROMISC;
716 		break;
717 	case NL80211_IFTYPE_STATION:
718 		*aid = 1;
719 		break;
720 	case NL80211_IFTYPE_AP:
721 	case NL80211_IFTYPE_ADHOC:
722 	case NL80211_IFTYPE_MESH_POINT:
723 		if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
724 			*aid = 0;
725 			*queue = P54_QUEUE_CAB;
726 			return;
727 		}
728 
729 		if (unlikely(ieee80211_is_mgmt(hdr->frame_control))) {
730 			if (ieee80211_is_probe_resp(hdr->frame_control)) {
731 				*aid = 0;
732 				*flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP |
733 					  P54_HDR_FLAG_DATA_OUT_NOCANCEL;
734 				return;
735 			} else if (ieee80211_is_beacon(hdr->frame_control)) {
736 				*aid = 0;
737 
738 				if (info->flags & IEEE80211_TX_CTL_INJECTED) {
739 					/*
740 					 * Injecting beacons on top of a AP is
741 					 * not a good idea... nevertheless,
742 					 * it should be doable.
743 					 */
744 
745 					return;
746 				}
747 
748 				*flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP;
749 				*queue = P54_QUEUE_BEACON;
750 				*extra_len = IEEE80211_MAX_TIM_LEN;
751 				return;
752 			}
753 		}
754 
755 		if (sta)
756 			*aid = sta->aid;
757 		break;
758 	}
759 }
760 
761 static u8 p54_convert_algo(u32 cipher)
762 {
763 	switch (cipher) {
764 	case WLAN_CIPHER_SUITE_WEP40:
765 	case WLAN_CIPHER_SUITE_WEP104:
766 		return P54_CRYPTO_WEP;
767 	case WLAN_CIPHER_SUITE_TKIP:
768 		return P54_CRYPTO_TKIPMICHAEL;
769 	case WLAN_CIPHER_SUITE_CCMP:
770 		return P54_CRYPTO_AESCCMP;
771 	default:
772 		return 0;
773 	}
774 }
775 
776 void p54_tx_80211(struct ieee80211_hw *dev,
777 		  struct ieee80211_tx_control *control,
778 		  struct sk_buff *skb)
779 {
780 	struct p54_common *priv = dev->priv;
781 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
782 	struct p54_tx_info *p54info;
783 	struct p54_hdr *hdr;
784 	struct p54_tx_data *txhdr;
785 	unsigned int padding, len, extra_len = 0;
786 	int i, j, ridx;
787 	u16 hdr_flags = 0, aid = 0;
788 	u8 rate, queue = 0, crypt_offset = 0;
789 	u8 cts_rate = 0x20;
790 	u8 rc_flags;
791 	u8 calculated_tries[4];
792 	u8 nrates = 0, nremaining = 8;
793 	bool burst_allowed = false;
794 
795 	p54_tx_80211_header(priv, skb, info, control->sta, &queue, &extra_len,
796 			    &hdr_flags, &aid, &burst_allowed);
797 
798 	if (p54_tx_qos_accounting_alloc(priv, skb, queue)) {
799 		ieee80211_free_txskb(dev, skb);
800 		return;
801 	}
802 
803 	padding = (unsigned long)(skb->data - (sizeof(*hdr) + sizeof(*txhdr))) & 3;
804 	len = skb->len;
805 
806 	if (info->control.hw_key) {
807 		crypt_offset = ieee80211_get_hdrlen_from_skb(skb);
808 		if (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
809 			u8 *iv = (u8 *)(skb->data + crypt_offset);
810 			/*
811 			 * The firmware excepts that the IV has to have
812 			 * this special format
813 			 */
814 			iv[1] = iv[0];
815 			iv[0] = iv[2];
816 			iv[2] = 0;
817 		}
818 	}
819 
820 	txhdr = skb_push(skb, sizeof(*txhdr) + padding);
821 	hdr = skb_push(skb, sizeof(*hdr));
822 
823 	if (padding)
824 		hdr_flags |= P54_HDR_FLAG_DATA_ALIGN;
825 	hdr->type = cpu_to_le16(aid);
826 	hdr->rts_tries = info->control.rates[0].count;
827 
828 	/*
829 	 * we register the rates in perfect order, and
830 	 * RTS/CTS won't happen on 5 GHz
831 	 */
832 	cts_rate = info->control.rts_cts_rate_idx;
833 
834 	memset(&txhdr->rateset, 0, sizeof(txhdr->rateset));
835 
836 	/* see how many rates got used */
837 	for (i = 0; i < dev->max_rates; i++) {
838 		if (info->control.rates[i].idx < 0)
839 			break;
840 		nrates++;
841 	}
842 
843 	/* limit tries to 8/nrates per rate */
844 	for (i = 0; i < nrates; i++) {
845 		/*
846 		 * The magic expression here is equivalent to 8/nrates for
847 		 * all values that matter, but avoids division and jumps.
848 		 * Note that nrates can only take the values 1 through 4.
849 		 */
850 		calculated_tries[i] = min_t(int, ((15 >> nrates) | 1) + 1,
851 						 info->control.rates[i].count);
852 		nremaining -= calculated_tries[i];
853 	}
854 
855 	/* if there are tries left, distribute from back to front */
856 	for (i = nrates - 1; nremaining > 0 && i >= 0; i--) {
857 		int tmp = info->control.rates[i].count - calculated_tries[i];
858 
859 		if (tmp <= 0)
860 			continue;
861 		/* RC requested more tries at this rate */
862 
863 		tmp = min_t(int, tmp, nremaining);
864 		calculated_tries[i] += tmp;
865 		nremaining -= tmp;
866 	}
867 
868 	ridx = 0;
869 	for (i = 0; i < nrates && ridx < 8; i++) {
870 		/* we register the rates in perfect order */
871 		rate = info->control.rates[i].idx;
872 		if (info->band == NL80211_BAND_5GHZ)
873 			rate += 4;
874 
875 		/* store the count we actually calculated for TX status */
876 		info->control.rates[i].count = calculated_tries[i];
877 
878 		rc_flags = info->control.rates[i].flags;
879 		if (rc_flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) {
880 			rate |= 0x10;
881 			cts_rate |= 0x10;
882 		}
883 		if (rc_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
884 			burst_allowed = false;
885 			rate |= 0x40;
886 		} else if (rc_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
887 			rate |= 0x20;
888 			burst_allowed = false;
889 		}
890 		for (j = 0; j < calculated_tries[i] && ridx < 8; j++) {
891 			txhdr->rateset[ridx] = rate;
892 			ridx++;
893 		}
894 	}
895 
896 	if (burst_allowed)
897 		hdr_flags |= P54_HDR_FLAG_DATA_OUT_BURST;
898 
899 	/* TODO: enable bursting */
900 	hdr->flags = cpu_to_le16(hdr_flags);
901 	hdr->tries = ridx;
902 	txhdr->rts_rate_idx = 0;
903 	if (info->control.hw_key) {
904 		txhdr->key_type = p54_convert_algo(info->control.hw_key->cipher);
905 		txhdr->key_len = min((u8)16, info->control.hw_key->keylen);
906 		memcpy(txhdr->key, info->control.hw_key->key, txhdr->key_len);
907 		if (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
908 			/* reserve space for the MIC key */
909 			len += 8;
910 			skb_put_data(skb,
911 				     &(info->control.hw_key->key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]),
912 				     8);
913 		}
914 		/* reserve some space for ICV */
915 		len += info->control.hw_key->icv_len;
916 		skb_put_zero(skb, info->control.hw_key->icv_len);
917 	} else {
918 		txhdr->key_type = 0;
919 		txhdr->key_len = 0;
920 	}
921 	txhdr->crypt_offset = crypt_offset;
922 	txhdr->hw_queue = queue;
923 	txhdr->backlog = priv->tx_stats[queue].len - 1;
924 	memset(txhdr->durations, 0, sizeof(txhdr->durations));
925 	txhdr->tx_antenna = 2 & priv->tx_diversity_mask;
926 	if (priv->rxhw == 5) {
927 		txhdr->longbow.cts_rate = cts_rate;
928 		txhdr->longbow.output_power = cpu_to_le16(priv->output_power);
929 	} else {
930 		txhdr->normal.output_power = priv->output_power;
931 		txhdr->normal.cts_rate = cts_rate;
932 	}
933 	if (padding)
934 		txhdr->align[0] = padding;
935 
936 	hdr->len = cpu_to_le16(len);
937 	/* modifies skb->cb and with it info, so must be last! */
938 	p54info = (void *) info->rate_driver_data;
939 	p54info->extra_len = extra_len;
940 
941 	p54_tx(priv, skb);
942 }
943