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p54: Move TX/RX code
[net-next-2.6.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
19#include <linux/init.h>
20#include <linux/firmware.h>
21#include <linux/etherdevice.h>
22
23#include <net/mac80211.h>
24
25#include "p54.h"
26#include "lmac.h"
27
28#ifdef P54_MM_DEBUG
29static void p54_dump_tx_queue(struct p54_common *priv)
30{
31 unsigned long flags;
32 struct ieee80211_tx_info *info;
33 struct p54_tx_info *range;
34 struct sk_buff *skb;
35 struct p54_hdr *hdr;
36 unsigned int i = 0;
37 u32 prev_addr;
38 u32 largest_hole = 0, free;
39
40 spin_lock_irqsave(&priv->tx_queue.lock, flags);
41 printk(KERN_DEBUG "%s: / --- tx queue dump (%d entries) --- \n",
42 wiphy_name(priv->hw->wiphy), skb_queue_len(&priv->tx_queue));
43
44 prev_addr = priv->rx_start;
45 skb_queue_walk(&priv->tx_queue, skb) {
46 info = IEEE80211_SKB_CB(skb);
47 range = (void *) info->rate_driver_data;
48 hdr = (void *) skb->data;
49
50 free = range->start_addr - prev_addr;
51 printk(KERN_DEBUG "%s: | [%02d] => [skb:%p skb_len:0x%04x "
52 "hdr:{flags:%02x len:%04x req_id:%04x type:%02x} "
53 "mem:{start:%04x end:%04x, free:%d}]\n",
54 wiphy_name(priv->hw->wiphy), i++, skb, skb->len,
55 le16_to_cpu(hdr->flags), le16_to_cpu(hdr->len),
56 le32_to_cpu(hdr->req_id), le16_to_cpu(hdr->type),
57 range->start_addr, range->end_addr, free);
58
59 prev_addr = range->end_addr;
60 largest_hole = max(largest_hole, free);
61 }
62 free = priv->rx_end - prev_addr;
63 largest_hole = max(largest_hole, free);
64 printk(KERN_DEBUG "%s: \\ --- [free: %d], largest free block: %d ---\n",
65 wiphy_name(priv->hw->wiphy), 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 */
79static 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 if (unlikely(WARN_ON(!skb || !priv)))
91 return -EINVAL;
92
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
114 if (!entry->next) {
115 spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
116 return -ENOSPC;
117 }
118
119 if (!target_skb && hole_size >= len) {
120 target_skb = entry->prev;
121 hole_size -= len;
122 target_addr = last_addr;
123 break;
124 }
125 last_addr = range->end_addr;
126 }
127 if (unlikely(!target_skb)) {
128 if (priv->rx_end - last_addr >= len) {
129 target_skb = priv->tx_queue.prev;
130 if (!skb_queue_empty(&priv->tx_queue)) {
131 info = IEEE80211_SKB_CB(target_skb);
132 range = (void *)info->rate_driver_data;
133 target_addr = range->end_addr;
134 }
135 } else {
136 spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
137 return -ENOSPC;
138 }
139 }
140
141 info = IEEE80211_SKB_CB(skb);
142 range = (void *) info->rate_driver_data;
143 range->start_addr = target_addr;
144 range->end_addr = target_addr + len;
145 __skb_queue_after(&priv->tx_queue, target_skb, skb);
146 spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
147 data->req_id = cpu_to_le32(target_addr + priv->headroom);
148 return 0;
149}
150
151static void p54_tx_pending(struct p54_common *priv)
152{
153 struct sk_buff *skb;
154 int ret;
155
156 if (unlikely(WARN_ON(!priv)))
157 return ;
158
159 skb = skb_dequeue(&priv->tx_pending);
160 if (unlikely(!skb))
161 return ;
162
163 ret = p54_assign_address(priv, skb);
164 if (unlikely(ret))
165 skb_queue_head(&priv->tx_pending, skb);
166 else
167 priv->tx(priv->hw, skb);
168}
169
170static void p54_wake_queues(struct p54_common *priv)
171{
172 unsigned long flags;
173 unsigned int i;
174
175 if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
176 return ;
177
178 p54_tx_pending(priv);
179
180 spin_lock_irqsave(&priv->tx_stats_lock, flags);
181 for (i = 0; i < priv->hw->queues; i++) {
182 if (priv->tx_stats[i + P54_QUEUE_DATA].len <
183 priv->tx_stats[i + P54_QUEUE_DATA].limit)
184 ieee80211_wake_queue(priv->hw, i);
185 }
186 spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
187}
188
189static int p54_tx_qos_accounting_alloc(struct p54_common *priv,
190 struct sk_buff *skb,
191 const u16 p54_queue)
192{
193 struct ieee80211_tx_queue_stats *queue;
194 unsigned long flags;
195
196 if (WARN_ON(p54_queue > P54_QUEUE_NUM))
197 return -EINVAL;
198
199 queue = &priv->tx_stats[p54_queue];
200
201 spin_lock_irqsave(&priv->tx_stats_lock, flags);
202 if (unlikely(queue->len > queue->limit && IS_QOS_QUEUE(p54_queue))) {
203 spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
204 return -ENOSPC;
205 }
206
207 queue->len++;
208 queue->count++;
209
210 if (unlikely(queue->len == queue->limit && IS_QOS_QUEUE(p54_queue))) {
211 u16 ac_queue = p54_queue - P54_QUEUE_DATA;
212 ieee80211_stop_queue(priv->hw, ac_queue);
213 }
214
215 spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
216 return 0;
217}
218
219static void p54_tx_qos_accounting_free(struct p54_common *priv,
220 struct sk_buff *skb)
221{
222 if (skb && IS_DATA_FRAME(skb)) {
223 struct p54_hdr *hdr = (void *) skb->data;
224 struct p54_tx_data *data = (void *) hdr->data;
225
226 priv->tx_stats[data->hw_queue].len--;
227 }
228 p54_wake_queues(priv);
229}
230
231void p54_free_skb(struct ieee80211_hw *dev, struct sk_buff *skb)
232{
233 struct p54_common *priv = dev->priv;
234 if (unlikely(!skb))
235 return ;
236
237 skb_unlink(skb, &priv->tx_queue);
238 p54_tx_qos_accounting_free(priv, skb);
239 dev_kfree_skb_any(skb);
240}
241EXPORT_SYMBOL_GPL(p54_free_skb);
242
243static struct sk_buff *p54_find_and_unlink_skb(struct p54_common *priv,
244 const __le32 req_id)
245{
246 struct sk_buff *entry;
247 unsigned long flags;
248
249 spin_lock_irqsave(&priv->tx_queue.lock, flags);
250 skb_queue_walk(&priv->tx_queue, entry) {
251 struct p54_hdr *hdr = (struct p54_hdr *) entry->data;
252
253 if (hdr->req_id == req_id) {
254 __skb_unlink(entry, &priv->tx_queue);
255 spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
256 p54_tx_qos_accounting_free(priv, entry);
257 return entry;
258 }
259 }
260 spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
261 return NULL;
262}
263
264void p54_tx(struct p54_common *priv, struct sk_buff *skb)
265{
266 if (unlikely(WARN_ON(!priv)))
267 return ;
268
269 skb_queue_tail(&priv->tx_pending, skb);
270 p54_tx_pending(priv);
271}
272
273static int p54_rssi_to_dbm(struct p54_common *priv, int rssi)
274{
275 int band = priv->hw->conf.channel->band;
276
277 if (priv->rxhw != 5)
278 return ((rssi * priv->rssical_db[band].mul) / 64 +
279 priv->rssical_db[band].add) / 4;
280 else
281 /*
282 * TODO: find the correct formula
283 */
284 return ((rssi * priv->rssical_db[band].mul) / 64 +
285 priv->rssical_db[band].add) / 4;
286}
287
288static int p54_rx_data(struct p54_common *priv, struct sk_buff *skb)
289{
290 struct p54_rx_data *hdr = (struct p54_rx_data *) skb->data;
291 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
292 u16 freq = le16_to_cpu(hdr->freq);
293 size_t header_len = sizeof(*hdr);
294 u32 tsf32;
295 u8 rate = hdr->rate & 0xf;
296
297 /*
298 * If the device is in a unspecified state we have to
299 * ignore all data frames. Else we could end up with a
300 * nasty crash.
301 */
302 if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
303 return 0;
304
305 if (!(hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_IN_FCS_GOOD)))
306 return 0;
307
308 if (hdr->decrypt_status == P54_DECRYPT_OK)
309 rx_status->flag |= RX_FLAG_DECRYPTED;
310 if ((hdr->decrypt_status == P54_DECRYPT_FAIL_MICHAEL) ||
311 (hdr->decrypt_status == P54_DECRYPT_FAIL_TKIP))
312 rx_status->flag |= RX_FLAG_MMIC_ERROR;
313
314 rx_status->signal = p54_rssi_to_dbm(priv, hdr->rssi);
315 rx_status->noise = priv->noise;
316 if (hdr->rate & 0x10)
317 rx_status->flag |= RX_FLAG_SHORTPRE;
318 if (priv->hw->conf.channel->band == IEEE80211_BAND_5GHZ)
319 rx_status->rate_idx = (rate < 4) ? 0 : rate - 4;
320 else
321 rx_status->rate_idx = rate;
322
323 rx_status->freq = freq;
324 rx_status->band = priv->hw->conf.channel->band;
325 rx_status->antenna = hdr->antenna;
326
327 tsf32 = le32_to_cpu(hdr->tsf32);
328 if (tsf32 < priv->tsf_low32)
329 priv->tsf_high32++;
330 rx_status->mactime = ((u64)priv->tsf_high32) << 32 | tsf32;
331 priv->tsf_low32 = tsf32;
332
333 rx_status->flag |= RX_FLAG_TSFT;
334
335 if (hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
336 header_len += hdr->align[0];
337
338 skb_pull(skb, header_len);
339 skb_trim(skb, le16_to_cpu(hdr->len));
340 ieee80211_rx_irqsafe(priv->hw, skb);
341
342 queue_delayed_work(priv->hw->workqueue, &priv->work,
343 msecs_to_jiffies(P54_STATISTICS_UPDATE));
344
345 return -1;
346}
347
348static void p54_rx_frame_sent(struct p54_common *priv, struct sk_buff *skb)
349{
350 struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
351 struct p54_frame_sent *payload = (struct p54_frame_sent *) hdr->data;
352 struct ieee80211_tx_info *info;
353 struct p54_hdr *entry_hdr;
354 struct p54_tx_data *entry_data;
355 struct sk_buff *entry;
356 unsigned int pad = 0, frame_len;
357 int count, idx;
358
359 entry = p54_find_and_unlink_skb(priv, hdr->req_id);
360 if (unlikely(!entry))
361 return ;
362
363 frame_len = entry->len;
364 info = IEEE80211_SKB_CB(entry);
365 entry_hdr = (struct p54_hdr *) entry->data;
366 entry_data = (struct p54_tx_data *) entry_hdr->data;
367 priv->stats.dot11ACKFailureCount += payload->tries - 1;
368
369 /*
370 * Frames in P54_QUEUE_FWSCAN and P54_QUEUE_BEACON are
371 * generated by the driver. Therefore tx_status is bogus
372 * and we don't want to confuse the mac80211 stack.
373 */
374 if (unlikely(entry_data->hw_queue < P54_QUEUE_FWSCAN)) {
375 if (entry_data->hw_queue == P54_QUEUE_BEACON &&
376 hdr->req_id == priv->beacon_req_id)
377 priv->beacon_req_id = cpu_to_le32(0);
378
379 dev_kfree_skb_any(entry);
380 return ;
381 }
382
383 /*
384 * Clear manually, ieee80211_tx_info_clear_status would
385 * clear the counts too and we need them.
386 */
387 memset(&info->status.ampdu_ack_len, 0,
388 sizeof(struct ieee80211_tx_info) -
389 offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
390 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info,
391 status.ampdu_ack_len) != 23);
392
393 if (entry_hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
394 pad = entry_data->align[0];
395
396 /* walk through the rates array and adjust the counts */
397 count = payload->tries;
398 for (idx = 0; idx < 4; idx++) {
399 if (count >= info->status.rates[idx].count) {
400 count -= info->status.rates[idx].count;
401 } else if (count > 0) {
402 info->status.rates[idx].count = count;
403 count = 0;
404 } else {
405 info->status.rates[idx].idx = -1;
406 info->status.rates[idx].count = 0;
407 }
408 }
409
410 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
411 (!payload->status))
412 info->flags |= IEEE80211_TX_STAT_ACK;
413 if (payload->status & P54_TX_PSM_CANCELLED)
414 info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
415 info->status.ack_signal = p54_rssi_to_dbm(priv,
416 (int)payload->ack_rssi);
417
418 /* Undo all changes to the frame. */
419 switch (entry_data->key_type) {
420 case P54_CRYPTO_TKIPMICHAEL: {
421 u8 *iv = (u8 *)(entry_data->align + pad +
422 entry_data->crypt_offset);
423
424 /* Restore the original TKIP IV. */
425 iv[2] = iv[0];
426 iv[0] = iv[1];
427 iv[1] = (iv[0] | 0x20) & 0x7f; /* WEPSeed - 8.3.2.2 */
428
429 frame_len -= 12; /* remove TKIP_MMIC + TKIP_ICV */
430 break;
431 }
432 case P54_CRYPTO_AESCCMP:
433 frame_len -= 8; /* remove CCMP_MIC */
434 break;
435 case P54_CRYPTO_WEP:
436 frame_len -= 4; /* remove WEP_ICV */
437 break;
438 }
439
440 skb_trim(entry, frame_len);
441 skb_pull(entry, sizeof(*hdr) + pad + sizeof(*entry_data));
442 ieee80211_tx_status_irqsafe(priv->hw, entry);
443}
444
445static void p54_rx_eeprom_readback(struct p54_common *priv,
446 struct sk_buff *skb)
447{
448 struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
449 struct p54_eeprom_lm86 *eeprom = (struct p54_eeprom_lm86 *) hdr->data;
450 struct sk_buff *tmp;
451
452 if (!priv->eeprom)
453 return ;
454
455 if (priv->fw_var >= 0x509) {
456 memcpy(priv->eeprom, eeprom->v2.data,
457 le16_to_cpu(eeprom->v2.len));
458 } else {
459 memcpy(priv->eeprom, eeprom->v1.data,
460 le16_to_cpu(eeprom->v1.len));
461 }
462
463 priv->eeprom = NULL;
464 tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
465 p54_tx_qos_accounting_free(priv, tmp);
466 dev_kfree_skb_any(tmp);
467 complete(&priv->eeprom_comp);
468}
469
470static void p54_rx_stats(struct p54_common *priv, struct sk_buff *skb)
471{
472 struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
473 struct p54_statistics *stats = (struct p54_statistics *) hdr->data;
474 struct sk_buff *tmp;
475 u32 tsf32;
476
477 if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
478 return ;
479
480 tsf32 = le32_to_cpu(stats->tsf32);
481 if (tsf32 < priv->tsf_low32)
482 priv->tsf_high32++;
483 priv->tsf_low32 = tsf32;
484
485 priv->stats.dot11RTSFailureCount = le32_to_cpu(stats->rts_fail);
486 priv->stats.dot11RTSSuccessCount = le32_to_cpu(stats->rts_success);
487 priv->stats.dot11FCSErrorCount = le32_to_cpu(stats->rx_bad_fcs);
488
489 priv->noise = p54_rssi_to_dbm(priv, le32_to_cpu(stats->noise));
490
491 tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
492 p54_tx_qos_accounting_free(priv, tmp);
493 dev_kfree_skb_any(tmp);
494}
495
496static void p54_rx_trap(struct p54_common *priv, struct sk_buff *skb)
497{
498 struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
499 struct p54_trap *trap = (struct p54_trap *) hdr->data;
500 u16 event = le16_to_cpu(trap->event);
501 u16 freq = le16_to_cpu(trap->frequency);
502
503 switch (event) {
504 case P54_TRAP_BEACON_TX:
505 break;
506 case P54_TRAP_RADAR:
507 printk(KERN_INFO "%s: radar (freq:%d MHz)\n",
508 wiphy_name(priv->hw->wiphy), freq);
509 break;
510 case P54_TRAP_NO_BEACON:
511 if (priv->vif)
512 ieee80211_beacon_loss(priv->vif);
513 break;
514 case P54_TRAP_SCAN:
515 break;
516 case P54_TRAP_TBTT:
517 break;
518 case P54_TRAP_TIMER:
519 break;
520 default:
521 printk(KERN_INFO "%s: received event:%x freq:%d\n",
522 wiphy_name(priv->hw->wiphy), event, freq);
523 break;
524 }
525}
526
527static int p54_rx_control(struct p54_common *priv, struct sk_buff *skb)
528{
529 struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
530
531 switch (le16_to_cpu(hdr->type)) {
532 case P54_CONTROL_TYPE_TXDONE:
533 p54_rx_frame_sent(priv, skb);
534 break;
535 case P54_CONTROL_TYPE_TRAP:
536 p54_rx_trap(priv, skb);
537 break;
538 case P54_CONTROL_TYPE_BBP:
539 break;
540 case P54_CONTROL_TYPE_STAT_READBACK:
541 p54_rx_stats(priv, skb);
542 break;
543 case P54_CONTROL_TYPE_EEPROM_READBACK:
544 p54_rx_eeprom_readback(priv, skb);
545 break;
546 default:
547 printk(KERN_DEBUG "%s: not handling 0x%02x type control frame\n",
548 wiphy_name(priv->hw->wiphy), le16_to_cpu(hdr->type));
549 break;
550 }
551 return 0;
552}
553
554/* returns zero if skb can be reused */
555int p54_rx(struct ieee80211_hw *dev, struct sk_buff *skb)
556{
557 struct p54_common *priv = dev->priv;
558 u16 type = le16_to_cpu(*((__le16 *)skb->data));
559
560 if (type & P54_HDR_FLAG_CONTROL)
561 return p54_rx_control(priv, skb);
562 else
563 return p54_rx_data(priv, skb);
564}
565EXPORT_SYMBOL_GPL(p54_rx);
566
567static void p54_tx_80211_header(struct p54_common *priv, struct sk_buff *skb,
568 struct ieee80211_tx_info *info, u8 *queue,
569 u32 *extra_len, u16 *flags, u16 *aid,
570 bool *burst_possible)
571{
572 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
573
574 if (ieee80211_is_data_qos(hdr->frame_control))
575 *burst_possible = true;
576 else
577 *burst_possible = false;
578
579 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
580 *flags |= P54_HDR_FLAG_DATA_OUT_SEQNR;
581
582 if (info->flags & IEEE80211_TX_CTL_CLEAR_PS_FILT)
583 *flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL;
584
585 *queue = skb_get_queue_mapping(skb) + P54_QUEUE_DATA;
586
587 switch (priv->mode) {
588 case NL80211_IFTYPE_MONITOR:
589 /*
590 * We have to set P54_HDR_FLAG_DATA_OUT_PROMISC for
591 * every frame in promiscuous/monitor mode.
592 * see STSW45x0C LMAC API - page 12.
593 */
594 *aid = 0;
595 *flags |= P54_HDR_FLAG_DATA_OUT_PROMISC;
596 break;
597 case NL80211_IFTYPE_STATION:
598 *aid = 1;
599 break;
600 case NL80211_IFTYPE_AP:
601 case NL80211_IFTYPE_ADHOC:
602 case NL80211_IFTYPE_MESH_POINT:
603 if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
604 *aid = 0;
605 *queue = P54_QUEUE_CAB;
606 return;
607 }
608
609 if (unlikely(ieee80211_is_mgmt(hdr->frame_control))) {
610 if (ieee80211_is_probe_resp(hdr->frame_control)) {
611 *aid = 0;
612 *flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP |
613 P54_HDR_FLAG_DATA_OUT_NOCANCEL;
614 return;
615 } else if (ieee80211_is_beacon(hdr->frame_control)) {
616 *aid = 0;
617
618 if (info->flags & IEEE80211_TX_CTL_INJECTED) {
619 /*
620 * Injecting beacons on top of a AP is
621 * not a good idea... nevertheless,
622 * it should be doable.
623 */
624
625 return;
626 }
627
628 *flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP;
629 *queue = P54_QUEUE_BEACON;
630 *extra_len = IEEE80211_MAX_TIM_LEN;
631 return;
632 }
633 }
634
635 if (info->control.sta)
636 *aid = info->control.sta->aid;
637 break;
638 }
639}
640
641static u8 p54_convert_algo(enum ieee80211_key_alg alg)
642{
643 switch (alg) {
644 case ALG_WEP:
645 return P54_CRYPTO_WEP;
646 case ALG_TKIP:
647 return P54_CRYPTO_TKIPMICHAEL;
648 case ALG_CCMP:
649 return P54_CRYPTO_AESCCMP;
650 default:
651 return 0;
652 }
653}
654
655int p54_tx_80211(struct ieee80211_hw *dev, struct sk_buff *skb)
656{
657 struct p54_common *priv = dev->priv;
658 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
659 struct p54_tx_info *p54info;
660 struct p54_hdr *hdr;
661 struct p54_tx_data *txhdr;
662 unsigned int padding, len, extra_len;
663 int i, j, ridx;
664 u16 hdr_flags = 0, aid = 0;
665 u8 rate, queue = 0, crypt_offset = 0;
666 u8 cts_rate = 0x20;
667 u8 rc_flags;
668 u8 calculated_tries[4];
669 u8 nrates = 0, nremaining = 8;
670 bool burst_allowed = false;
671
672 p54_tx_80211_header(priv, skb, info, &queue, &extra_len,
673 &hdr_flags, &aid, &burst_allowed);
674
675 if (p54_tx_qos_accounting_alloc(priv, skb, queue)) {
676 if (!IS_QOS_QUEUE(queue)) {
677 dev_kfree_skb_any(skb);
678 return NETDEV_TX_OK;
679 } else {
680 return NETDEV_TX_BUSY;
681 }
682 }
683
684 padding = (unsigned long)(skb->data - (sizeof(*hdr) + sizeof(*txhdr))) & 3;
685 len = skb->len;
686
687 if (info->control.hw_key) {
688 crypt_offset = ieee80211_get_hdrlen_from_skb(skb);
689 if (info->control.hw_key->alg == ALG_TKIP) {
690 u8 *iv = (u8 *)(skb->data + crypt_offset);
691 /*
692 * The firmware excepts that the IV has to have
693 * this special format
694 */
695 iv[1] = iv[0];
696 iv[0] = iv[2];
697 iv[2] = 0;
698 }
699 }
700
701 txhdr = (struct p54_tx_data *) skb_push(skb, sizeof(*txhdr) + padding);
702 hdr = (struct p54_hdr *) skb_push(skb, sizeof(*hdr));
703
704 if (padding)
705 hdr_flags |= P54_HDR_FLAG_DATA_ALIGN;
706 hdr->type = cpu_to_le16(aid);
707 hdr->rts_tries = info->control.rates[0].count;
708
709 /*
710 * we register the rates in perfect order, and
711 * RTS/CTS won't happen on 5 GHz
712 */
713 cts_rate = info->control.rts_cts_rate_idx;
714
715 memset(&txhdr->rateset, 0, sizeof(txhdr->rateset));
716
717 /* see how many rates got used */
718 for (i = 0; i < dev->max_rates; i++) {
719 if (info->control.rates[i].idx < 0)
720 break;
721 nrates++;
722 }
723
724 /* limit tries to 8/nrates per rate */
725 for (i = 0; i < nrates; i++) {
726 /*
727 * The magic expression here is equivalent to 8/nrates for
728 * all values that matter, but avoids division and jumps.
729 * Note that nrates can only take the values 1 through 4.
730 */
731 calculated_tries[i] = min_t(int, ((15 >> nrates) | 1) + 1,
732 info->control.rates[i].count);
733 nremaining -= calculated_tries[i];
734 }
735
736 /* if there are tries left, distribute from back to front */
737 for (i = nrates - 1; nremaining > 0 && i >= 0; i--) {
738 int tmp = info->control.rates[i].count - calculated_tries[i];
739
740 if (tmp <= 0)
741 continue;
742 /* RC requested more tries at this rate */
743
744 tmp = min_t(int, tmp, nremaining);
745 calculated_tries[i] += tmp;
746 nremaining -= tmp;
747 }
748
749 ridx = 0;
750 for (i = 0; i < nrates && ridx < 8; i++) {
751 /* we register the rates in perfect order */
752 rate = info->control.rates[i].idx;
753 if (info->band == IEEE80211_BAND_5GHZ)
754 rate += 4;
755
756 /* store the count we actually calculated for TX status */
757 info->control.rates[i].count = calculated_tries[i];
758
759 rc_flags = info->control.rates[i].flags;
760 if (rc_flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) {
761 rate |= 0x10;
762 cts_rate |= 0x10;
763 }
764 if (rc_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
765 burst_allowed = false;
766 rate |= 0x40;
767 } else if (rc_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
768 rate |= 0x20;
769 burst_allowed = false;
770 }
771 for (j = 0; j < calculated_tries[i] && ridx < 8; j++) {
772 txhdr->rateset[ridx] = rate;
773 ridx++;
774 }
775 }
776
777 if (burst_allowed)
778 hdr_flags |= P54_HDR_FLAG_DATA_OUT_BURST;
779
780 /* TODO: enable bursting */
781 hdr->flags = cpu_to_le16(hdr_flags);
782 hdr->tries = ridx;
783 txhdr->rts_rate_idx = 0;
784 if (info->control.hw_key) {
785 txhdr->key_type = p54_convert_algo(info->control.hw_key->alg);
786 txhdr->key_len = min((u8)16, info->control.hw_key->keylen);
787 memcpy(txhdr->key, info->control.hw_key->key, txhdr->key_len);
788 if (info->control.hw_key->alg == ALG_TKIP) {
789 /* reserve space for the MIC key */
790 len += 8;
791 memcpy(skb_put(skb, 8), &(info->control.hw_key->key
792 [NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]), 8);
793 }
794 /* reserve some space for ICV */
795 len += info->control.hw_key->icv_len;
796 memset(skb_put(skb, info->control.hw_key->icv_len), 0,
797 info->control.hw_key->icv_len);
798 } else {
799 txhdr->key_type = 0;
800 txhdr->key_len = 0;
801 }
802 txhdr->crypt_offset = crypt_offset;
803 txhdr->hw_queue = queue;
804 txhdr->backlog = priv->tx_stats[queue].len - 1;
805 memset(txhdr->durations, 0, sizeof(txhdr->durations));
806 txhdr->tx_antenna = ((info->antenna_sel_tx == 0) ?
807 2 : info->antenna_sel_tx - 1) & priv->tx_diversity_mask;
808 if (priv->rxhw == 5) {
809 txhdr->longbow.cts_rate = cts_rate;
810 txhdr->longbow.output_power = cpu_to_le16(priv->output_power);
811 } else {
812 txhdr->normal.output_power = priv->output_power;
813 txhdr->normal.cts_rate = cts_rate;
814 }
815 if (padding)
816 txhdr->align[0] = padding;
817
818 hdr->len = cpu_to_le16(len);
819 /* modifies skb->cb and with it info, so must be last! */
820 p54info = (void *) info->rate_driver_data;
821 p54info->extra_len = extra_len;
822
823 p54_tx(priv, skb);
824 return NETDEV_TX_OK;
825}
Clone of davem's net-next-2.6 tree