1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23#include <linux/kernel.h>
24#include <linux/module.h>
25
26#include "wl1251.h"
27#include "reg.h"
28#include "tx.h"
29#include "ps.h"
30#include "io.h"
31#include "event.h"
32
33static bool wl1251_tx_double_buffer_busy(struct wl1251 *wl, u32 data_out_count)
34{
35 int used, data_in_count;
36
37 data_in_count = wl->data_in_count;
38
39 if (data_in_count < data_out_count)
40
41 data_in_count += TX_STATUS_DATA_OUT_COUNT_MASK + 1;
42
43 used = data_in_count - data_out_count;
44
45 WARN_ON(used < 0);
46 WARN_ON(used > DP_TX_PACKET_RING_CHUNK_NUM);
47
48 if (used >= DP_TX_PACKET_RING_CHUNK_NUM)
49 return true;
50 else
51 return false;
52}
53
54static int wl1251_tx_path_status(struct wl1251 *wl)
55{
56 u32 status, addr, data_out_count;
57 bool busy;
58
59 addr = wl->data_path->tx_control_addr;
60 status = wl1251_mem_read32(wl, addr);
61 data_out_count = status & TX_STATUS_DATA_OUT_COUNT_MASK;
62 busy = wl1251_tx_double_buffer_busy(wl, data_out_count);
63
64 if (busy)
65 return -EBUSY;
66
67 return 0;
68}
69
70static int wl1251_tx_id(struct wl1251 *wl, struct sk_buff *skb)
71{
72 int i;
73
74 for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
75 if (wl->tx_frames[i] == NULL) {
76 wl->tx_frames[i] = skb;
77 return i;
78 }
79
80 return -EBUSY;
81}
82
83static void wl1251_tx_control(struct tx_double_buffer_desc *tx_hdr,
84 struct ieee80211_tx_info *control, u16 fc)
85{
86 *(u16 *)&tx_hdr->control = 0;
87
88 tx_hdr->control.rate_policy = 0;
89
90
91 tx_hdr->control.packet_type = 0;
92
93
94 if ((control->flags & IEEE80211_TX_CTL_NO_ACK) ||
95 (control->flags & IEEE80211_TX_CTL_INJECTED)) {
96 tx_hdr->control.rate_policy = 1;
97 tx_hdr->control.ack_policy = 1;
98 }
99
100 tx_hdr->control.tx_complete = 1;
101
102 if ((fc & IEEE80211_FTYPE_DATA) &&
103 ((fc & IEEE80211_STYPE_QOS_DATA) ||
104 (fc & IEEE80211_STYPE_QOS_NULLFUNC)))
105 tx_hdr->control.qos = 1;
106}
107
108
109#define MAX_MSDU_SECURITY_LENGTH 16
110#define MAX_MPDU_SECURITY_LENGTH 16
111#define WLAN_QOS_HDR_LEN 26
112#define MAX_MPDU_HEADER_AND_SECURITY (MAX_MPDU_SECURITY_LENGTH + \
113 WLAN_QOS_HDR_LEN)
114#define HW_BLOCK_SIZE 252
115static void wl1251_tx_frag_block_num(struct tx_double_buffer_desc *tx_hdr)
116{
117 u16 payload_len, frag_threshold, mem_blocks;
118 u16 num_mpdus, mem_blocks_per_frag;
119
120 frag_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
121 tx_hdr->frag_threshold = cpu_to_le16(frag_threshold);
122
123 payload_len = le16_to_cpu(tx_hdr->length) + MAX_MSDU_SECURITY_LENGTH;
124
125 if (payload_len > frag_threshold) {
126 mem_blocks_per_frag =
127 ((frag_threshold + MAX_MPDU_HEADER_AND_SECURITY) /
128 HW_BLOCK_SIZE) + 1;
129 num_mpdus = payload_len / frag_threshold;
130 mem_blocks = num_mpdus * mem_blocks_per_frag;
131 payload_len -= num_mpdus * frag_threshold;
132 num_mpdus++;
133
134 } else {
135 mem_blocks_per_frag = 0;
136 mem_blocks = 0;
137 num_mpdus = 1;
138 }
139
140 mem_blocks += (payload_len / HW_BLOCK_SIZE) + 1;
141
142 if (num_mpdus > 1)
143 mem_blocks += min(num_mpdus, mem_blocks_per_frag);
144
145 tx_hdr->num_mem_blocks = mem_blocks;
146}
147
148static int wl1251_tx_fill_hdr(struct wl1251 *wl, struct sk_buff *skb,
149 struct ieee80211_tx_info *control)
150{
151 struct tx_double_buffer_desc *tx_hdr;
152 struct ieee80211_rate *rate;
153 int id;
154 u16 fc;
155
156 if (!skb)
157 return -EINVAL;
158
159 id = wl1251_tx_id(wl, skb);
160 if (id < 0)
161 return id;
162
163 fc = *(u16 *)skb->data;
164 tx_hdr = (struct tx_double_buffer_desc *) skb_push(skb,
165 sizeof(*tx_hdr));
166
167 tx_hdr->length = cpu_to_le16(skb->len - sizeof(*tx_hdr));
168 rate = ieee80211_get_tx_rate(wl->hw, control);
169 tx_hdr->rate = cpu_to_le16(rate->hw_value);
170 tx_hdr->expiry_time = cpu_to_le32(1 << 16);
171 tx_hdr->id = id;
172
173 tx_hdr->xmit_queue = wl1251_tx_get_queue(skb_get_queue_mapping(skb));
174
175 wl1251_tx_control(tx_hdr, control, fc);
176 wl1251_tx_frag_block_num(tx_hdr);
177
178 return 0;
179}
180
181
182static int wl1251_tx_send_packet(struct wl1251 *wl, struct sk_buff *skb,
183 struct ieee80211_tx_info *control)
184{
185 struct tx_double_buffer_desc *tx_hdr;
186 int len;
187 u32 addr;
188
189 if (!skb)
190 return -EINVAL;
191
192 tx_hdr = (struct tx_double_buffer_desc *) skb->data;
193
194 if (control->control.hw_key &&
195 control->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
196 int hdrlen;
197 __le16 fc;
198 u16 length;
199 u8 *pos;
200
201 fc = *(__le16 *)(skb->data + sizeof(*tx_hdr));
202 length = le16_to_cpu(tx_hdr->length) + WL1251_TKIP_IV_SPACE;
203 tx_hdr->length = cpu_to_le16(length);
204
205 hdrlen = ieee80211_hdrlen(fc);
206
207 pos = skb_push(skb, WL1251_TKIP_IV_SPACE);
208 memmove(pos, pos + WL1251_TKIP_IV_SPACE,
209 sizeof(*tx_hdr) + hdrlen);
210 }
211
212
213
214
215
216 if (unlikely((long)skb->data & 0x03)) {
217 int offset = (4 - (long)skb->data) & 0x03;
218 wl1251_debug(DEBUG_TX, "skb offset %d", offset);
219
220
221 if (skb_cloned(skb) || (skb_tailroom(skb) < offset)) {
222 struct sk_buff *newskb = skb_copy_expand(skb, 0, 3,
223 GFP_KERNEL);
224
225 if (unlikely(newskb == NULL)) {
226 wl1251_error("Can't allocate skb!");
227 return -EINVAL;
228 }
229
230 tx_hdr = (struct tx_double_buffer_desc *) newskb->data;
231
232 dev_kfree_skb_any(skb);
233 wl->tx_frames[tx_hdr->id] = skb = newskb;
234
235 offset = (4 - (long)skb->data) & 0x03;
236 wl1251_debug(DEBUG_TX, "new skb offset %d", offset);
237 }
238
239
240 if (offset) {
241 unsigned char *src = skb->data;
242 skb_reserve(skb, offset);
243 memmove(skb->data, src, skb->len);
244 tx_hdr = (struct tx_double_buffer_desc *) skb->data;
245 }
246 }
247
248
249 len = WL1251_TX_ALIGN(skb->len);
250
251 if (wl->data_in_count & 0x1)
252 addr = wl->data_path->tx_packet_ring_addr +
253 wl->data_path->tx_packet_ring_chunk_size;
254 else
255 addr = wl->data_path->tx_packet_ring_addr;
256
257 wl1251_mem_write(wl, addr, skb->data, len);
258
259 wl1251_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u rate 0x%x "
260 "queue %d", tx_hdr->id, skb, tx_hdr->length,
261 tx_hdr->rate, tx_hdr->xmit_queue);
262
263 return 0;
264}
265
266static void wl1251_tx_trigger(struct wl1251 *wl)
267{
268 u32 data, addr;
269
270 if (wl->data_in_count & 0x1) {
271 addr = ACX_REG_INTERRUPT_TRIG_H;
272 data = INTR_TRIG_TX_PROC1;
273 } else {
274 addr = ACX_REG_INTERRUPT_TRIG;
275 data = INTR_TRIG_TX_PROC0;
276 }
277
278 wl1251_reg_write32(wl, addr, data);
279
280
281 wl->data_in_count = (wl->data_in_count + 1) &
282 TX_STATUS_DATA_OUT_COUNT_MASK;
283}
284
285static void enable_tx_for_packet_injection(struct wl1251 *wl)
286{
287 int ret;
288
289 ret = wl1251_cmd_join(wl, BSS_TYPE_STA_BSS, wl->channel,
290 wl->beacon_int, wl->dtim_period);
291 if (ret < 0) {
292 wl1251_warning("join failed");
293 return;
294 }
295
296 ret = wl1251_event_wait(wl, JOIN_EVENT_COMPLETE_ID, 100);
297 if (ret < 0) {
298 wl1251_warning("join timeout");
299 return;
300 }
301
302 wl->joined = true;
303}
304
305
306static int wl1251_tx_frame(struct wl1251 *wl, struct sk_buff *skb)
307{
308 struct ieee80211_tx_info *info;
309 int ret = 0;
310 u8 idx;
311
312 info = IEEE80211_SKB_CB(skb);
313
314 if (info->control.hw_key) {
315 if (unlikely(wl->monitor_present))
316 return -EINVAL;
317
318 idx = info->control.hw_key->hw_key_idx;
319 if (unlikely(wl->default_key != idx)) {
320 ret = wl1251_acx_default_key(wl, idx);
321 if (ret < 0)
322 return ret;
323 }
324 }
325
326
327 if ((wl->vif == NULL) && !wl->joined)
328 enable_tx_for_packet_injection(wl);
329
330 ret = wl1251_tx_path_status(wl);
331 if (ret < 0)
332 return ret;
333
334 ret = wl1251_tx_fill_hdr(wl, skb, info);
335 if (ret < 0)
336 return ret;
337
338 ret = wl1251_tx_send_packet(wl, skb, info);
339 if (ret < 0)
340 return ret;
341
342 wl1251_tx_trigger(wl);
343
344 return ret;
345}
346
347void wl1251_tx_work(struct work_struct *work)
348{
349 struct wl1251 *wl = container_of(work, struct wl1251, tx_work);
350 struct sk_buff *skb;
351 bool woken_up = false;
352 int ret;
353
354 mutex_lock(&wl->mutex);
355
356 if (unlikely(wl->state == WL1251_STATE_OFF))
357 goto out;
358
359 while ((skb = skb_dequeue(&wl->tx_queue))) {
360 if (!woken_up) {
361 ret = wl1251_ps_elp_wakeup(wl);
362 if (ret < 0)
363 goto out;
364 woken_up = true;
365 }
366
367 ret = wl1251_tx_frame(wl, skb);
368 if (ret == -EBUSY) {
369 skb_queue_head(&wl->tx_queue, skb);
370 goto out;
371 } else if (ret < 0) {
372 dev_kfree_skb(skb);
373 goto out;
374 }
375 }
376
377out:
378 if (woken_up)
379 wl1251_ps_elp_sleep(wl);
380
381 mutex_unlock(&wl->mutex);
382}
383
384static const char *wl1251_tx_parse_status(u8 status)
385{
386
387 static char buf[9];
388 int i = 0;
389
390 memset(buf, 0, sizeof(buf));
391
392 if (status & TX_DMA_ERROR)
393 buf[i++] = 'm';
394 if (status & TX_DISABLED)
395 buf[i++] = 'd';
396 if (status & TX_RETRY_EXCEEDED)
397 buf[i++] = 'r';
398 if (status & TX_TIMEOUT)
399 buf[i++] = 't';
400 if (status & TX_KEY_NOT_FOUND)
401 buf[i++] = 'k';
402 if (status & TX_ENCRYPT_FAIL)
403 buf[i++] = 'e';
404 if (status & TX_UNAVAILABLE_PRIORITY)
405 buf[i++] = 'p';
406
407
408
409 return buf;
410}
411
412static void wl1251_tx_packet_cb(struct wl1251 *wl,
413 struct tx_result *result)
414{
415 struct ieee80211_tx_info *info;
416 struct sk_buff *skb;
417 int hdrlen;
418 u8 *frame;
419
420 skb = wl->tx_frames[result->id];
421 if (skb == NULL) {
422 wl1251_error("SKB for packet %d is NULL", result->id);
423 return;
424 }
425
426 info = IEEE80211_SKB_CB(skb);
427
428 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
429 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
430 (result->status == TX_SUCCESS))
431 info->flags |= IEEE80211_TX_STAT_ACK;
432
433 info->status.rates[0].count = result->ack_failures + 1;
434 wl->stats.retry_count += result->ack_failures;
435
436
437
438
439
440 frame = skb_pull(skb, sizeof(struct tx_double_buffer_desc));
441 if (info->control.hw_key &&
442 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
443 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
444 memmove(frame + WL1251_TKIP_IV_SPACE, frame, hdrlen);
445 skb_pull(skb, WL1251_TKIP_IV_SPACE);
446 }
447
448 wl1251_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
449 " status 0x%x (%s)",
450 result->id, skb, result->ack_failures, result->rate,
451 result->status, wl1251_tx_parse_status(result->status));
452
453
454 ieee80211_tx_status(wl->hw, skb);
455
456 wl->tx_frames[result->id] = NULL;
457}
458
459
460void wl1251_tx_complete(struct wl1251 *wl)
461{
462 int i, result_index, num_complete = 0, queue_len;
463 struct tx_result result[FW_TX_CMPLT_BLOCK_SIZE], *result_ptr;
464 unsigned long flags;
465
466 if (unlikely(wl->state != WL1251_STATE_ON))
467 return;
468
469
470 wl1251_mem_read(wl, wl->data_path->tx_complete_addr,
471 result, sizeof(result));
472
473 result_index = wl->next_tx_complete;
474
475 for (i = 0; i < ARRAY_SIZE(result); i++) {
476 result_ptr = &result[result_index];
477
478 if (result_ptr->done_1 == 1 &&
479 result_ptr->done_2 == 1) {
480 wl1251_tx_packet_cb(wl, result_ptr);
481
482 result_ptr->done_1 = 0;
483 result_ptr->done_2 = 0;
484
485 result_index = (result_index + 1) &
486 (FW_TX_CMPLT_BLOCK_SIZE - 1);
487 num_complete++;
488 } else {
489 break;
490 }
491 }
492
493 queue_len = skb_queue_len(&wl->tx_queue);
494
495 if ((num_complete > 0) && (queue_len > 0)) {
496
497 wl1251_debug(DEBUG_TX, "tx_complete: reschedule tx_work");
498 ieee80211_queue_work(wl->hw, &wl->tx_work);
499 }
500
501 if (wl->tx_queue_stopped &&
502 queue_len <= WL1251_TX_QUEUE_LOW_WATERMARK) {
503
504 wl1251_debug(DEBUG_TX, "tx_complete: waking queues");
505 spin_lock_irqsave(&wl->wl_lock, flags);
506 ieee80211_wake_queues(wl->hw);
507 wl->tx_queue_stopped = false;
508 spin_unlock_irqrestore(&wl->wl_lock, flags);
509 }
510
511
512 if (num_complete) {
513
514
515
516
517 if (result_index > wl->next_tx_complete) {
518
519 wl1251_mem_write(wl,
520 wl->data_path->tx_complete_addr +
521 (wl->next_tx_complete *
522 sizeof(struct tx_result)),
523 &result[wl->next_tx_complete],
524 num_complete *
525 sizeof(struct tx_result));
526
527
528 } else if (result_index < wl->next_tx_complete) {
529
530 wl1251_mem_write(wl,
531 wl->data_path->tx_complete_addr +
532 (wl->next_tx_complete *
533 sizeof(struct tx_result)),
534 &result[wl->next_tx_complete],
535 (FW_TX_CMPLT_BLOCK_SIZE -
536 wl->next_tx_complete) *
537 sizeof(struct tx_result));
538
539 wl1251_mem_write(wl,
540 wl->data_path->tx_complete_addr,
541 result,
542 (num_complete -
543 FW_TX_CMPLT_BLOCK_SIZE +
544 wl->next_tx_complete) *
545 sizeof(struct tx_result));
546
547 } else {
548
549 wl1251_mem_write(wl,
550 wl->data_path->tx_complete_addr,
551 result,
552 FW_TX_CMPLT_BLOCK_SIZE *
553 sizeof(struct tx_result));
554 }
555
556 }
557
558 wl->next_tx_complete = result_index;
559}
560
561
562void wl1251_tx_flush(struct wl1251 *wl)
563{
564 int i;
565 struct sk_buff *skb;
566 struct ieee80211_tx_info *info;
567
568
569
570
571 while ((skb = skb_dequeue(&wl->tx_queue))) {
572 info = IEEE80211_SKB_CB(skb);
573
574 wl1251_debug(DEBUG_TX, "flushing skb 0x%p", skb);
575
576 if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
577 continue;
578
579 ieee80211_tx_status(wl->hw, skb);
580 }
581
582 for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
583 if (wl->tx_frames[i] != NULL) {
584 skb = wl->tx_frames[i];
585 info = IEEE80211_SKB_CB(skb);
586
587 if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
588 continue;
589
590 ieee80211_tx_status(wl->hw, skb);
591 wl->tx_frames[i] = NULL;
592 }
593}
594
