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ath6kl: fix warning for using 0 as NULL
[linux-stable.git] / drivers / net / wireless / ath / ath6kl / htc_mbox.c
blob65c31da43c4738de6a58a840c7e858fc5844b8f0
1 /*
2 * Copyright (c) 2007-2011 Atheros Communications Inc.
3 * Copyright (c) 2011-2012 Qualcomm Atheros, Inc.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include "core.h"
19 #include "hif.h"
20 #include "debug.h"
21 #include "hif-ops.h"
22 #include "trace.h"
23
24 #include <asm/unaligned.h>
25
26 #define CALC_TXRX_PADDED_LEN(dev, len) (__ALIGN_MASK((len), (dev)->block_mask))
27
28 static void ath6kl_htc_mbox_cleanup(struct htc_target *target);
29 static void ath6kl_htc_mbox_stop(struct htc_target *target);
30 static int ath6kl_htc_mbox_add_rxbuf_multiple(struct htc_target *target,
31 struct list_head *pkt_queue);
32 static void ath6kl_htc_set_credit_dist(struct htc_target *target,
33 struct ath6kl_htc_credit_info *cred_info,
34 u16 svc_pri_order[], int len);
35
36 /* threshold to re-enable Tx bundling for an AC*/
37 #define TX_RESUME_BUNDLE_THRESHOLD 1500
38
39 /* Functions for Tx credit handling */
40 static void ath6kl_credit_deposit(struct ath6kl_htc_credit_info *cred_info,
41 struct htc_endpoint_credit_dist *ep_dist,
42 int credits)
43 {
44 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit deposit ep %d credits %d\n",
45 ep_dist->endpoint, credits);
46
47 ep_dist->credits += credits;
48 ep_dist->cred_assngd += credits;
49 cred_info->cur_free_credits -= credits;
50 }
51
52 static void ath6kl_credit_init(struct ath6kl_htc_credit_info *cred_info,
53 struct list_head *ep_list,
54 int tot_credits)
55 {
56 struct htc_endpoint_credit_dist *cur_ep_dist;
57 int count;
58
59 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit init total %d\n", tot_credits);
60
61 cred_info->cur_free_credits = tot_credits;
62 cred_info->total_avail_credits = tot_credits;
63
64 list_for_each_entry(cur_ep_dist, ep_list, list) {
65 if (cur_ep_dist->endpoint == ENDPOINT_0)
66 continue;
67
68 cur_ep_dist->cred_min = cur_ep_dist->cred_per_msg;
69
70 if (tot_credits > 4) {
71 if ((cur_ep_dist->svc_id == WMI_DATA_BK_SVC) ||
72 (cur_ep_dist->svc_id == WMI_DATA_BE_SVC)) {
73 ath6kl_credit_deposit(cred_info,
74 cur_ep_dist,
75 cur_ep_dist->cred_min);
76 cur_ep_dist->dist_flags |= HTC_EP_ACTIVE;
77 }
78 }
79
80 if (cur_ep_dist->svc_id == WMI_CONTROL_SVC) {
81 ath6kl_credit_deposit(cred_info, cur_ep_dist,
82 cur_ep_dist->cred_min);
83 /*
84 * Control service is always marked active, it
85 * never goes inactive EVER.
86 */
87 cur_ep_dist->dist_flags |= HTC_EP_ACTIVE;
88 }
89
90 /*
91 * Streams have to be created (explicit | implicit) for all
92 * kinds of traffic. BE endpoints are also inactive in the
93 * beginning. When BE traffic starts it creates implicit
94 * streams that redistributes credits.
95 *
96 * Note: all other endpoints have minimums set but are
97 * initially given NO credits. credits will be distributed
98 * as traffic activity demands
99 */
100 }
101
102 /*
103 * For ath6kl_credit_seek function,
104 * it use list_for_each_entry_reverse to walk around the whole ep list.
105 * Therefore assign this lowestpri_ep_dist after walk around the ep_list
106 */
107 cred_info->lowestpri_ep_dist = cur_ep_dist->list;
108
109 WARN_ON(cred_info->cur_free_credits <= 0);
110
111 list_for_each_entry(cur_ep_dist, ep_list, list) {
112 if (cur_ep_dist->endpoint == ENDPOINT_0)
113 continue;
114
115 if (cur_ep_dist->svc_id == WMI_CONTROL_SVC) {
116 cur_ep_dist->cred_norm = cur_ep_dist->cred_per_msg;
117 } else {
118 /*
119 * For the remaining data endpoints, we assume that
120 * each cred_per_msg are the same. We use a simple
121 * calculation here, we take the remaining credits
122 * and determine how many max messages this can
123 * cover and then set each endpoint's normal value
124 * equal to 3/4 this amount.
125 */
126 count = (cred_info->cur_free_credits /
127 cur_ep_dist->cred_per_msg)
128 * cur_ep_dist->cred_per_msg;
129 count = (count * 3) >> 2;
130 count = max(count, cur_ep_dist->cred_per_msg);
131 cur_ep_dist->cred_norm = count;
132 }
133
134 ath6kl_dbg(ATH6KL_DBG_CREDIT,
135 "credit ep %d svc_id %d credits %d per_msg %d norm %d min %d\n",
136 cur_ep_dist->endpoint,
137 cur_ep_dist->svc_id,
138 cur_ep_dist->credits,
139 cur_ep_dist->cred_per_msg,
140 cur_ep_dist->cred_norm,
141 cur_ep_dist->cred_min);
142 }
143 }
144
145 /* initialize and setup credit distribution */
146 static int ath6kl_htc_mbox_credit_setup(struct htc_target *htc_target,
147 struct ath6kl_htc_credit_info *cred_info)
148 {
149 u16 servicepriority[5];
150
151 memset(cred_info, 0, sizeof(struct ath6kl_htc_credit_info));
152
153 servicepriority[0] = WMI_CONTROL_SVC; /* highest */
154 servicepriority[1] = WMI_DATA_VO_SVC;
155 servicepriority[2] = WMI_DATA_VI_SVC;
156 servicepriority[3] = WMI_DATA_BE_SVC;
157 servicepriority[4] = WMI_DATA_BK_SVC; /* lowest */
158
159 /* set priority list */
160 ath6kl_htc_set_credit_dist(htc_target, cred_info, servicepriority, 5);
161
162 return 0;
163 }
164
165 /* reduce an ep's credits back to a set limit */
166 static void ath6kl_credit_reduce(struct ath6kl_htc_credit_info *cred_info,
167 struct htc_endpoint_credit_dist *ep_dist,
168 int limit)
169 {
170 int credits;
171
172 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit reduce ep %d limit %d\n",
173 ep_dist->endpoint, limit);
174
175 ep_dist->cred_assngd = limit;
176
177 if (ep_dist->credits <= limit)
178 return;
179
180 credits = ep_dist->credits - limit;
181 ep_dist->credits -= credits;
182 cred_info->cur_free_credits += credits;
183 }
184
185 static void ath6kl_credit_update(struct ath6kl_htc_credit_info *cred_info,
186 struct list_head *epdist_list)
187 {
188 struct htc_endpoint_credit_dist *cur_list;
189
190 list_for_each_entry(cur_list, epdist_list, list) {
191 if (cur_list->endpoint == ENDPOINT_0)
192 continue;
193
194 if (cur_list->cred_to_dist > 0) {
195 cur_list->credits += cur_list->cred_to_dist;
196 cur_list->cred_to_dist = 0;
197
198 if (cur_list->credits > cur_list->cred_assngd)
199 ath6kl_credit_reduce(cred_info,
200 cur_list,
201 cur_list->cred_assngd);
202
203 if (cur_list->credits > cur_list->cred_norm)
204 ath6kl_credit_reduce(cred_info, cur_list,
205 cur_list->cred_norm);
206
207 if (!(cur_list->dist_flags & HTC_EP_ACTIVE)) {
208 if (cur_list->txq_depth == 0)
209 ath6kl_credit_reduce(cred_info,
210 cur_list, 0);
211 }
212 }
213 }
214 }
215
216 /*
217 * HTC has an endpoint that needs credits, ep_dist is the endpoint in
218 * question.
219 */
220 static void ath6kl_credit_seek(struct ath6kl_htc_credit_info *cred_info,
221 struct htc_endpoint_credit_dist *ep_dist)
222 {
223 struct htc_endpoint_credit_dist *curdist_list;
224 int credits = 0;
225 int need;
226
227 if (ep_dist->svc_id == WMI_CONTROL_SVC)
228 goto out;
229
230 if ((ep_dist->svc_id == WMI_DATA_VI_SVC) ||
231 (ep_dist->svc_id == WMI_DATA_VO_SVC))
232 if ((ep_dist->cred_assngd >= ep_dist->cred_norm))
233 goto out;
234
235 /*
236 * For all other services, we follow a simple algorithm of:
237 *
238 * 1. checking the free pool for credits
239 * 2. checking lower priority endpoints for credits to take
240 */
241
242 credits = min(cred_info->cur_free_credits, ep_dist->seek_cred);
243
244 if (credits >= ep_dist->seek_cred)
245 goto out;
246
247 /*
248 * We don't have enough in the free pool, try taking away from
249 * lower priority services The rule for taking away credits:
250 *
251 * 1. Only take from lower priority endpoints
252 * 2. Only take what is allocated above the minimum (never
253 * starve an endpoint completely)
254 * 3. Only take what you need.
255 */
256
257 list_for_each_entry_reverse(curdist_list,
258 &cred_info->lowestpri_ep_dist,
259 list) {
260 if (curdist_list == ep_dist)
261 break;
262
263 need = ep_dist->seek_cred - cred_info->cur_free_credits;
264
265 if ((curdist_list->cred_assngd - need) >=
266 curdist_list->cred_min) {
267 /*
268 * The current one has been allocated more than
269 * it's minimum and it has enough credits assigned
270 * above it's minimum to fulfill our need try to
271 * take away just enough to fulfill our need.
272 */
273 ath6kl_credit_reduce(cred_info, curdist_list,
274 curdist_list->cred_assngd - need);
275
276 if (cred_info->cur_free_credits >=
277 ep_dist->seek_cred)
278 break;
279 }
280
281 if (curdist_list->endpoint == ENDPOINT_0)
282 break;
283 }
284
285 credits = min(cred_info->cur_free_credits, ep_dist->seek_cred);
286
287 out:
288 /* did we find some credits? */
289 if (credits)
290 ath6kl_credit_deposit(cred_info, ep_dist, credits);
291
292 ep_dist->seek_cred = 0;
293 }
294
295 /* redistribute credits based on activity change */
296 static void ath6kl_credit_redistribute(struct ath6kl_htc_credit_info *info,
297 struct list_head *ep_dist_list)
298 {
299 struct htc_endpoint_credit_dist *curdist_list;
300
301 list_for_each_entry(curdist_list, ep_dist_list, list) {
302 if (curdist_list->endpoint == ENDPOINT_0)
303 continue;
304
305 if ((curdist_list->svc_id == WMI_DATA_BK_SVC) ||
306 (curdist_list->svc_id == WMI_DATA_BE_SVC))
307 curdist_list->dist_flags |= HTC_EP_ACTIVE;
308
309 if ((curdist_list->svc_id != WMI_CONTROL_SVC) &&
310 !(curdist_list->dist_flags & HTC_EP_ACTIVE)) {
311 if (curdist_list->txq_depth == 0)
312 ath6kl_credit_reduce(info, curdist_list, 0);
313 else
314 ath6kl_credit_reduce(info,
315 curdist_list,
316 curdist_list->cred_min);
317 }
318 }
319 }
320
321 /*
322 *
323 * This function is invoked whenever endpoints require credit
324 * distributions. A lock is held while this function is invoked, this
325 * function shall NOT block. The ep_dist_list is a list of distribution
326 * structures in prioritized order as defined by the call to the
327 * htc_set_credit_dist() api.
328 */
329 static void ath6kl_credit_distribute(struct ath6kl_htc_credit_info *cred_info,
330 struct list_head *ep_dist_list,
331 enum htc_credit_dist_reason reason)
332 {
333 switch (reason) {
334 case HTC_CREDIT_DIST_SEND_COMPLETE:
335 ath6kl_credit_update(cred_info, ep_dist_list);
336 break;
337 case HTC_CREDIT_DIST_ACTIVITY_CHANGE:
338 ath6kl_credit_redistribute(cred_info, ep_dist_list);
339 break;
340 default:
341 break;
342 }
343
344 WARN_ON(cred_info->cur_free_credits > cred_info->total_avail_credits);
345 WARN_ON(cred_info->cur_free_credits < 0);
346 }
347
348 static void ath6kl_htc_tx_buf_align(u8 **buf, unsigned long len)
349 {
350 u8 *align_addr;
351
352 if (!IS_ALIGNED((unsigned long) *buf, 4)) {
353 align_addr = PTR_ALIGN(*buf - 4, 4);
354 memmove(align_addr, *buf, len);
355 *buf = align_addr;
356 }
357 }
358
359 static void ath6kl_htc_tx_prep_pkt(struct htc_packet *packet, u8 flags,
360 int ctrl0, int ctrl1)
361 {
362 struct htc_frame_hdr *hdr;
363
364 packet->buf -= HTC_HDR_LENGTH;
365 hdr = (struct htc_frame_hdr *)packet->buf;
366
367 /* Endianess? */
368 put_unaligned((u16)packet->act_len, &hdr->payld_len);
369 hdr->flags = flags;
370 hdr->eid = packet->endpoint;
371 hdr->ctrl[0] = ctrl0;
372 hdr->ctrl[1] = ctrl1;
373 }
374
375 static void htc_reclaim_txctrl_buf(struct htc_target *target,
376 struct htc_packet *pkt)
377 {
378 spin_lock_bh(&target->htc_lock);
379 list_add_tail(&pkt->list, &target->free_ctrl_txbuf);
380 spin_unlock_bh(&target->htc_lock);
381 }
382
383 static struct htc_packet *htc_get_control_buf(struct htc_target *target,
384 bool tx)
385 {
386 struct htc_packet *packet = NULL;
387 struct list_head *buf_list;
388
389 buf_list = tx ? &target->free_ctrl_txbuf : &target->free_ctrl_rxbuf;
390
391 spin_lock_bh(&target->htc_lock);
392
393 if (list_empty(buf_list)) {
394 spin_unlock_bh(&target->htc_lock);
395 return NULL;
396 }
397
398 packet = list_first_entry(buf_list, struct htc_packet, list);
399 list_del(&packet->list);
400 spin_unlock_bh(&target->htc_lock);
401
402 if (tx)
403 packet->buf = packet->buf_start + HTC_HDR_LENGTH;
404
405 return packet;
406 }
407
408 static void htc_tx_comp_update(struct htc_target *target,
409 struct htc_endpoint *endpoint,
410 struct htc_packet *packet)
411 {
412 packet->completion = NULL;
413 packet->buf += HTC_HDR_LENGTH;
414
415 if (!packet->status)
416 return;
417
418 ath6kl_err("req failed (status:%d, ep:%d, len:%d creds:%d)\n",
419 packet->status, packet->endpoint, packet->act_len,
420 packet->info.tx.cred_used);
421
422 /* on failure to submit, reclaim credits for this packet */
423 spin_lock_bh(&target->tx_lock);
424 endpoint->cred_dist.cred_to_dist +=
425 packet->info.tx.cred_used;
426 endpoint->cred_dist.txq_depth = get_queue_depth(&endpoint->txq);
427
428 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx ctxt 0x%p dist 0x%p\n",
429 target->credit_info, &target->cred_dist_list);
430
431 ath6kl_credit_distribute(target->credit_info,
432 &target->cred_dist_list,
433 HTC_CREDIT_DIST_SEND_COMPLETE);
434
435 spin_unlock_bh(&target->tx_lock);
436 }
437
438 static void htc_tx_complete(struct htc_endpoint *endpoint,
439 struct list_head *txq)
440 {
441 if (list_empty(txq))
442 return;
443
444 ath6kl_dbg(ATH6KL_DBG_HTC,
445 "htc tx complete ep %d pkts %d\n",
446 endpoint->eid, get_queue_depth(txq));
447
448 ath6kl_tx_complete(endpoint->target, txq);
449 }
450
451 static void htc_tx_comp_handler(struct htc_target *target,
452 struct htc_packet *packet)
453 {
454 struct htc_endpoint *endpoint = &target->endpoint[packet->endpoint];
455 struct list_head container;
456
457 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx complete seqno %d\n",
458 packet->info.tx.seqno);
459
460 htc_tx_comp_update(target, endpoint, packet);
461 INIT_LIST_HEAD(&container);
462 list_add_tail(&packet->list, &container);
463 /* do completion */
464 htc_tx_complete(endpoint, &container);
465 }
466
467 static void htc_async_tx_scat_complete(struct htc_target *target,
468 struct hif_scatter_req *scat_req)
469 {
470 struct htc_endpoint *endpoint;
471 struct htc_packet *packet;
472 struct list_head tx_compq;
473 int i;
474
475 INIT_LIST_HEAD(&tx_compq);
476
477 ath6kl_dbg(ATH6KL_DBG_HTC,
478 "htc tx scat complete len %d entries %d\n",
479 scat_req->len, scat_req->scat_entries);
480
481 if (scat_req->status)
482 ath6kl_err("send scatter req failed: %d\n", scat_req->status);
483
484 packet = scat_req->scat_list[0].packet;
485 endpoint = &target->endpoint[packet->endpoint];
486
487 /* walk through the scatter list and process */
488 for (i = 0; i < scat_req->scat_entries; i++) {
489 packet = scat_req->scat_list[i].packet;
490 if (!packet) {
491 WARN_ON(1);
492 return;
493 }
494
495 packet->status = scat_req->status;
496 htc_tx_comp_update(target, endpoint, packet);
497 list_add_tail(&packet->list, &tx_compq);
498 }
499
500 /* free scatter request */
501 hif_scatter_req_add(target->dev->ar, scat_req);
502
503 /* complete all packets */
504 htc_tx_complete(endpoint, &tx_compq);
505 }
506
507 static int ath6kl_htc_tx_issue(struct htc_target *target,
508 struct htc_packet *packet)
509 {
510 int status;
511 bool sync = false;
512 u32 padded_len, send_len;
513
514 if (!packet->completion)
515 sync = true;
516
517 send_len = packet->act_len + HTC_HDR_LENGTH;
518
519 padded_len = CALC_TXRX_PADDED_LEN(target, send_len);
520
521 ath6kl_dbg(ATH6KL_DBG_HTC,
522 "htc tx issue len %d seqno %d padded_len %d mbox 0x%X %s\n",
523 send_len, packet->info.tx.seqno, padded_len,
524 target->dev->ar->mbox_info.htc_addr,
525 sync ? "sync" : "async");
526
527 if (sync) {
528 status = hif_read_write_sync(target->dev->ar,
529 target->dev->ar->mbox_info.htc_addr,
530 packet->buf, padded_len,
531 HIF_WR_SYNC_BLOCK_INC);
532
533 packet->status = status;
534 packet->buf += HTC_HDR_LENGTH;
535 } else
536 status = hif_write_async(target->dev->ar,
537 target->dev->ar->mbox_info.htc_addr,
538 packet->buf, padded_len,
539 HIF_WR_ASYNC_BLOCK_INC, packet);
540
541 trace_ath6kl_htc_tx(status, packet->endpoint, packet->buf, send_len);
542
543 return status;
544 }
545
546 static int htc_check_credits(struct htc_target *target,
547 struct htc_endpoint *ep, u8 *flags,
548 enum htc_endpoint_id eid, unsigned int len,
549 int *req_cred)
550 {
551 *req_cred = (len > target->tgt_cred_sz) ?
552 DIV_ROUND_UP(len, target->tgt_cred_sz) : 1;
553
554 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit check need %d got %d\n",
555 *req_cred, ep->cred_dist.credits);
556
557 if (ep->cred_dist.credits < *req_cred) {
558 if (eid == ENDPOINT_0)
559 return -EINVAL;
560
561 /* Seek more credits */
562 ep->cred_dist.seek_cred = *req_cred - ep->cred_dist.credits;
563
564 ath6kl_credit_seek(target->credit_info, &ep->cred_dist);
565
566 ep->cred_dist.seek_cred = 0;
567
568 if (ep->cred_dist.credits < *req_cred) {
569 ath6kl_dbg(ATH6KL_DBG_CREDIT,
570 "credit not found for ep %d\n",
571 eid);
572 return -EINVAL;
573 }
574 }
575
576 ep->cred_dist.credits -= *req_cred;
577 ep->ep_st.cred_cosumd += *req_cred;
578
579 /* When we are getting low on credits, ask for more */
580 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) {
581 ep->cred_dist.seek_cred =
582 ep->cred_dist.cred_per_msg - ep->cred_dist.credits;
583
584 ath6kl_credit_seek(target->credit_info, &ep->cred_dist);
585
586 /* see if we were successful in getting more */
587 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) {
588 /* tell the target we need credits ASAP! */
589 *flags |= HTC_FLAGS_NEED_CREDIT_UPDATE;
590 ep->ep_st.cred_low_indicate += 1;
591 ath6kl_dbg(ATH6KL_DBG_CREDIT,
592 "credit we need credits asap\n");
593 }
594 }
595
596 return 0;
597 }
598
599 static void ath6kl_htc_tx_pkts_get(struct htc_target *target,
600 struct htc_endpoint *endpoint,
601 struct list_head *queue)
602 {
603 int req_cred;
604 u8 flags;
605 struct htc_packet *packet;
606 unsigned int len;
607
608 while (true) {
609 flags = 0;
610
611 if (list_empty(&endpoint->txq))
612 break;
613 packet = list_first_entry(&endpoint->txq, struct htc_packet,
614 list);
615
616 ath6kl_dbg(ATH6KL_DBG_HTC,
617 "htc tx got packet 0x%p queue depth %d\n",
618 packet, get_queue_depth(&endpoint->txq));
619
620 len = CALC_TXRX_PADDED_LEN(target,
621 packet->act_len + HTC_HDR_LENGTH);
622
623 if (htc_check_credits(target, endpoint, &flags,
624 packet->endpoint, len, &req_cred))
625 break;
626
627 /* now we can fully move onto caller's queue */
628 packet = list_first_entry(&endpoint->txq, struct htc_packet,
629 list);
630 list_move_tail(&packet->list, queue);
631
632 /* save the number of credits this packet consumed */
633 packet->info.tx.cred_used = req_cred;
634
635 /* all TX packets are handled asynchronously */
636 packet->completion = htc_tx_comp_handler;
637 packet->context = target;
638 endpoint->ep_st.tx_issued += 1;
639
640 /* save send flags */
641 packet->info.tx.flags = flags;
642 packet->info.tx.seqno = endpoint->seqno;
643 endpoint->seqno++;
644 }
645 }
646
647 /* See if the padded tx length falls on a credit boundary */
648 static int htc_get_credit_padding(unsigned int cred_sz, int *len,
649 struct htc_endpoint *ep)
650 {
651 int rem_cred, cred_pad;
652
653 rem_cred = *len % cred_sz;
654
655 /* No padding needed */
656 if (!rem_cred)
657 return 0;
658
659 if (!(ep->conn_flags & HTC_FLGS_TX_BNDL_PAD_EN))
660 return -1;
661
662 /*
663 * The transfer consumes a "partial" credit, this
664 * packet cannot be bundled unless we add
665 * additional "dummy" padding (max 255 bytes) to
666 * consume the entire credit.
667 */
668 cred_pad = *len < cred_sz ? (cred_sz - *len) : rem_cred;
669
670 if ((cred_pad > 0) && (cred_pad <= 255))
671 *len += cred_pad;
672 else
673 /* The amount of padding is too large, send as non-bundled */
674 return -1;
675
676 return cred_pad;
677 }
678
679 static int ath6kl_htc_tx_setup_scat_list(struct htc_target *target,
680 struct htc_endpoint *endpoint,
681 struct hif_scatter_req *scat_req,
682 int n_scat,
683 struct list_head *queue)
684 {
685 struct htc_packet *packet;
686 int i, len, rem_scat, cred_pad;
687 int status = 0;
688 u8 flags;
689
690 rem_scat = target->max_tx_bndl_sz;
691
692 for (i = 0; i < n_scat; i++) {
693 scat_req->scat_list[i].packet = NULL;
694
695 if (list_empty(queue))
696 break;
697
698 packet = list_first_entry(queue, struct htc_packet, list);
699 len = CALC_TXRX_PADDED_LEN(target,
700 packet->act_len + HTC_HDR_LENGTH);
701
702 cred_pad = htc_get_credit_padding(target->tgt_cred_sz,
703 &len, endpoint);
704 if (cred_pad < 0 || rem_scat < len) {
705 status = -ENOSPC;
706 break;
707 }
708
709 rem_scat -= len;
710 /* now remove it from the queue */
711 list_del(&packet->list);
712
713 scat_req->scat_list[i].packet = packet;
714 /* prepare packet and flag message as part of a send bundle */
715 flags = packet->info.tx.flags | HTC_FLAGS_SEND_BUNDLE;
716 ath6kl_htc_tx_prep_pkt(packet, flags,
717 cred_pad, packet->info.tx.seqno);
718 /* Make sure the buffer is 4-byte aligned */
719 ath6kl_htc_tx_buf_align(&packet->buf,
720 packet->act_len + HTC_HDR_LENGTH);
721 scat_req->scat_list[i].buf = packet->buf;
722 scat_req->scat_list[i].len = len;
723
724 scat_req->len += len;
725 scat_req->scat_entries++;
726 ath6kl_dbg(ATH6KL_DBG_HTC,
727 "htc tx adding (%d) pkt 0x%p seqno %d len %d remaining %d\n",
728 i, packet, packet->info.tx.seqno, len, rem_scat);
729 }
730
731 /* Roll back scatter setup in case of any failure */
732 if (scat_req->scat_entries < HTC_MIN_HTC_MSGS_TO_BUNDLE) {
733 for (i = scat_req->scat_entries - 1; i >= 0; i--) {
734 packet = scat_req->scat_list[i].packet;
735 if (packet) {
736 packet->buf += HTC_HDR_LENGTH;
737 list_add(&packet->list, queue);
738 }
739 }
740 return -EAGAIN;
741 }
742
743 return status;
744 }
745
746 /*
747 * Drain a queue and send as bundles this function may return without fully
748 * draining the queue when
749 *
750 * 1. scatter resources are exhausted
751 * 2. a message that will consume a partial credit will stop the
752 * bundling process early
753 * 3. we drop below the minimum number of messages for a bundle
754 */
755 static void ath6kl_htc_tx_bundle(struct htc_endpoint *endpoint,
756 struct list_head *queue,
757 int *sent_bundle, int *n_bundle_pkts)
758 {
759 struct htc_target *target = endpoint->target;
760 struct hif_scatter_req *scat_req = NULL;
761 int n_scat, n_sent_bundle = 0, tot_pkts_bundle = 0, i;
762 struct htc_packet *packet;
763 int status;
764 u32 txb_mask;
765 u8 ac = WMM_NUM_AC;
766
767 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) &&
768 (WMI_CONTROL_SVC != endpoint->svc_id))
769 ac = target->dev->ar->ep2ac_map[endpoint->eid];
770
771 while (true) {
772 status = 0;
773 n_scat = get_queue_depth(queue);
774 n_scat = min(n_scat, target->msg_per_bndl_max);
775
776 if (n_scat < HTC_MIN_HTC_MSGS_TO_BUNDLE)
777 /* not enough to bundle */
778 break;
779
780 scat_req = hif_scatter_req_get(target->dev->ar);
781
782 if (!scat_req) {
783 /* no scatter resources */
784 ath6kl_dbg(ATH6KL_DBG_HTC,
785 "htc tx no more scatter resources\n");
786 break;
787 }
788
789 if ((ac < WMM_NUM_AC) && (ac != WMM_AC_BK)) {
790 if (WMM_AC_BE == ac)
791 /*
792 * BE, BK have priorities and bit
793 * positions reversed
794 */
795 txb_mask = (1 << WMM_AC_BK);
796 else
797 /*
798 * any AC with priority lower than
799 * itself
800 */
801 txb_mask = ((1 << ac) - 1);
802
803 /*
804 * when the scatter request resources drop below a
805 * certain threshold, disable Tx bundling for all
806 * AC's with priority lower than the current requesting
807 * AC. Otherwise re-enable Tx bundling for them
808 */
809 if (scat_req->scat_q_depth < ATH6KL_SCATTER_REQS)
810 target->tx_bndl_mask &= ~txb_mask;
811 else
812 target->tx_bndl_mask |= txb_mask;
813 }
814
815 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx pkts to scatter: %d\n",
816 n_scat);
817
818 scat_req->len = 0;
819 scat_req->scat_entries = 0;
820
821 status = ath6kl_htc_tx_setup_scat_list(target, endpoint,
822 scat_req, n_scat,
823 queue);
824 if (status == -EAGAIN) {
825 hif_scatter_req_add(target->dev->ar, scat_req);
826 break;
827 }
828
829 /* send path is always asynchronous */
830 scat_req->complete = htc_async_tx_scat_complete;
831 n_sent_bundle++;
832 tot_pkts_bundle += scat_req->scat_entries;
833
834 ath6kl_dbg(ATH6KL_DBG_HTC,
835 "htc tx scatter bytes %d entries %d\n",
836 scat_req->len, scat_req->scat_entries);
837
838 for (i = 0; i < scat_req->scat_entries; i++) {
839 packet = scat_req->scat_list[i].packet;
840 trace_ath6kl_htc_tx(packet->status, packet->endpoint,
841 packet->buf, packet->act_len);
842 }
843
844 ath6kl_hif_submit_scat_req(target->dev, scat_req, false);
845
846 if (status)
847 break;
848 }
849
850 *sent_bundle = n_sent_bundle;
851 *n_bundle_pkts = tot_pkts_bundle;
852 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx bundle sent %d pkts\n",
853 n_sent_bundle);
854
855 return;
856 }
857
858 static void ath6kl_htc_tx_from_queue(struct htc_target *target,
859 struct htc_endpoint *endpoint)
860 {
861 struct list_head txq;
862 struct htc_packet *packet;
863 int bundle_sent;
864 int n_pkts_bundle;
865 u8 ac = WMM_NUM_AC;
866 int status;
867
868 spin_lock_bh(&target->tx_lock);
869
870 endpoint->tx_proc_cnt++;
871 if (endpoint->tx_proc_cnt > 1) {
872 endpoint->tx_proc_cnt--;
873 spin_unlock_bh(&target->tx_lock);
874 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx busy\n");
875 return;
876 }
877
878 /*
879 * drain the endpoint TX queue for transmission as long
880 * as we have enough credits.
881 */
882 INIT_LIST_HEAD(&txq);
883
884 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) &&
885 (WMI_CONTROL_SVC != endpoint->svc_id))
886 ac = target->dev->ar->ep2ac_map[endpoint->eid];
887
888 while (true) {
889 if (list_empty(&endpoint->txq))
890 break;
891
892 ath6kl_htc_tx_pkts_get(target, endpoint, &txq);
893
894 if (list_empty(&txq))
895 break;
896
897 spin_unlock_bh(&target->tx_lock);
898
899 bundle_sent = 0;
900 n_pkts_bundle = 0;
901
902 while (true) {
903 /* try to send a bundle on each pass */
904 if ((target->tx_bndl_mask) &&
905 (get_queue_depth(&txq) >=
906 HTC_MIN_HTC_MSGS_TO_BUNDLE)) {
907 int temp1 = 0, temp2 = 0;
908
909 /* check if bundling is enabled for an AC */
910 if (target->tx_bndl_mask & (1 << ac)) {
911 ath6kl_htc_tx_bundle(endpoint, &txq,
912 &temp1, &temp2);
913 bundle_sent += temp1;
914 n_pkts_bundle += temp2;
915 }
916 }
917
918 if (list_empty(&txq))
919 break;
920
921 packet = list_first_entry(&txq, struct htc_packet,
922 list);
923 list_del(&packet->list);
924
925 ath6kl_htc_tx_prep_pkt(packet, packet->info.tx.flags,
926 0, packet->info.tx.seqno);
927 status = ath6kl_htc_tx_issue(target, packet);
928
929 if (status) {
930 packet->status = status;
931 packet->completion(packet->context, packet);
932 }
933 }
934
935 spin_lock_bh(&target->tx_lock);
936
937 endpoint->ep_st.tx_bundles += bundle_sent;
938 endpoint->ep_st.tx_pkt_bundled += n_pkts_bundle;
939
940 /*
941 * if an AC has bundling disabled and no tx bundling
942 * has occured continously for a certain number of TX,
943 * enable tx bundling for this AC
944 */
945 if (!bundle_sent) {
946 if (!(target->tx_bndl_mask & (1 << ac)) &&
947 (ac < WMM_NUM_AC)) {
948 if (++target->ac_tx_count[ac] >=
949 TX_RESUME_BUNDLE_THRESHOLD) {
950 target->ac_tx_count[ac] = 0;
951 target->tx_bndl_mask |= (1 << ac);
952 }
953 }
954 } else {
955 /* tx bundling will reset the counter */
956 if (ac < WMM_NUM_AC)
957 target->ac_tx_count[ac] = 0;
958 }
959 }
960
961 endpoint->tx_proc_cnt = 0;
962 spin_unlock_bh(&target->tx_lock);
963 }
964
965 static bool ath6kl_htc_tx_try(struct htc_target *target,
966 struct htc_endpoint *endpoint,
967 struct htc_packet *tx_pkt)
968 {
969 struct htc_ep_callbacks ep_cb;
970 int txq_depth;
971 bool overflow = false;
972
973 ep_cb = endpoint->ep_cb;
974
975 spin_lock_bh(&target->tx_lock);
976 txq_depth = get_queue_depth(&endpoint->txq);
977 spin_unlock_bh(&target->tx_lock);
978
979 if (txq_depth >= endpoint->max_txq_depth)
980 overflow = true;
981
982 if (overflow)
983 ath6kl_dbg(ATH6KL_DBG_HTC,
984 "htc tx overflow ep %d depth %d max %d\n",
985 endpoint->eid, txq_depth,
986 endpoint->max_txq_depth);
987
988 if (overflow && ep_cb.tx_full) {
989 if (ep_cb.tx_full(endpoint->target, tx_pkt) ==
990 HTC_SEND_FULL_DROP) {
991 endpoint->ep_st.tx_dropped += 1;
992 return false;
993 }
994 }
995
996 spin_lock_bh(&target->tx_lock);
997 list_add_tail(&tx_pkt->list, &endpoint->txq);
998 spin_unlock_bh(&target->tx_lock);
999
1000 ath6kl_htc_tx_from_queue(target, endpoint);
1001
1002 return true;
1003 }
1004
1005 static void htc_chk_ep_txq(struct htc_target *target)
1006 {
1007 struct htc_endpoint *endpoint;
1008 struct htc_endpoint_credit_dist *cred_dist;
1009
1010 /*
1011 * Run through the credit distribution list to see if there are
1012 * packets queued. NOTE: no locks need to be taken since the
1013 * distribution list is not dynamic (cannot be re-ordered) and we
1014 * are not modifying any state.
1015 */
1016 list_for_each_entry(cred_dist, &target->cred_dist_list, list) {
1017 endpoint = cred_dist->htc_ep;
1018
1019 spin_lock_bh(&target->tx_lock);
1020 if (!list_empty(&endpoint->txq)) {
1021 ath6kl_dbg(ATH6KL_DBG_HTC,
1022 "htc creds ep %d credits %d pkts %d\n",
1023 cred_dist->endpoint,
1024 endpoint->cred_dist.credits,
1025 get_queue_depth(&endpoint->txq));
1026 spin_unlock_bh(&target->tx_lock);
1027 /*
1028 * Try to start the stalled queue, this list is
1029 * ordered by priority. If there are credits
1030 * available the highest priority queue will get a
1031 * chance to reclaim credits from lower priority
1032 * ones.
1033 */
1034 ath6kl_htc_tx_from_queue(target, endpoint);
1035 spin_lock_bh(&target->tx_lock);
1036 }
1037 spin_unlock_bh(&target->tx_lock);
1038 }
1039 }
1040
1041 static int htc_setup_tx_complete(struct htc_target *target)
1042 {
1043 struct htc_packet *send_pkt = NULL;
1044 int status;
1045
1046 send_pkt = htc_get_control_buf(target, true);
1047
1048 if (!send_pkt)
1049 return -ENOMEM;
1050
1051 if (target->htc_tgt_ver >= HTC_VERSION_2P1) {
1052 struct htc_setup_comp_ext_msg *setup_comp_ext;
1053 u32 flags = 0;
1054
1055 setup_comp_ext =
1056 (struct htc_setup_comp_ext_msg *)send_pkt->buf;
1057 memset(setup_comp_ext, 0, sizeof(*setup_comp_ext));
1058 setup_comp_ext->msg_id =
1059 cpu_to_le16(HTC_MSG_SETUP_COMPLETE_EX_ID);
1060
1061 if (target->msg_per_bndl_max > 0) {
1062 /* Indicate HTC bundling to the target */
1063 flags |= HTC_SETUP_COMP_FLG_RX_BNDL_EN;
1064 setup_comp_ext->msg_per_rxbndl =
1065 target->msg_per_bndl_max;
1066 }
1067
1068 memcpy(&setup_comp_ext->flags, &flags,
1069 sizeof(setup_comp_ext->flags));
1070 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp_ext,
1071 sizeof(struct htc_setup_comp_ext_msg),
1072 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
1073
1074 } else {
1075 struct htc_setup_comp_msg *setup_comp;
1076 setup_comp = (struct htc_setup_comp_msg *)send_pkt->buf;
1077 memset(setup_comp, 0, sizeof(struct htc_setup_comp_msg));
1078 setup_comp->msg_id = cpu_to_le16(HTC_MSG_SETUP_COMPLETE_ID);
1079 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp,
1080 sizeof(struct htc_setup_comp_msg),
1081 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
1082 }
1083
1084 /* we want synchronous operation */
1085 send_pkt->completion = NULL;
1086 ath6kl_htc_tx_prep_pkt(send_pkt, 0, 0, 0);
1087 status = ath6kl_htc_tx_issue(target, send_pkt);
1088 htc_reclaim_txctrl_buf(target, send_pkt);
1089
1090 return status;
1091 }
1092
1093 static void ath6kl_htc_set_credit_dist(struct htc_target *target,
1094 struct ath6kl_htc_credit_info *credit_info,
1095 u16 srvc_pri_order[], int list_len)
1096 {
1097 struct htc_endpoint *endpoint;
1098 int i, ep;
1099
1100 target->credit_info = credit_info;
1101
1102 list_add_tail(&target->endpoint[ENDPOINT_0].cred_dist.list,
1103 &target->cred_dist_list);
1104
1105 for (i = 0; i < list_len; i++) {
1106 for (ep = ENDPOINT_1; ep < ENDPOINT_MAX; ep++) {
1107 endpoint = &target->endpoint[ep];
1108 if (endpoint->svc_id == srvc_pri_order[i]) {
1109 list_add_tail(&endpoint->cred_dist.list,
1110 &target->cred_dist_list);
1111 break;
1112 }
1113 }
1114 if (ep >= ENDPOINT_MAX) {
1115 WARN_ON(1);
1116 return;
1117 }
1118 }
1119 }
1120
1121 static int ath6kl_htc_mbox_tx(struct htc_target *target,
1122 struct htc_packet *packet)
1123 {
1124 struct htc_endpoint *endpoint;
1125 struct list_head queue;
1126
1127 ath6kl_dbg(ATH6KL_DBG_HTC,
1128 "htc tx ep id %d buf 0x%p len %d\n",
1129 packet->endpoint, packet->buf, packet->act_len);
1130
1131 if (packet->endpoint >= ENDPOINT_MAX) {
1132 WARN_ON(1);
1133 return -EINVAL;
1134 }
1135
1136 endpoint = &target->endpoint[packet->endpoint];
1137
1138 if (!ath6kl_htc_tx_try(target, endpoint, packet)) {
1139 packet->status = (target->htc_flags & HTC_OP_STATE_STOPPING) ?
1140 -ECANCELED : -ENOSPC;
1141 INIT_LIST_HEAD(&queue);
1142 list_add(&packet->list, &queue);
1143 htc_tx_complete(endpoint, &queue);
1144 }
1145
1146 return 0;
1147 }
1148
1149 /* flush endpoint TX queue */
1150 static void ath6kl_htc_mbox_flush_txep(struct htc_target *target,
1151 enum htc_endpoint_id eid, u16 tag)
1152 {
1153 struct htc_packet *packet, *tmp_pkt;
1154 struct list_head discard_q, container;
1155 struct htc_endpoint *endpoint = &target->endpoint[eid];
1156
1157 if (!endpoint->svc_id) {
1158 WARN_ON(1);
1159 return;
1160 }
1161
1162 /* initialize the discard queue */
1163 INIT_LIST_HEAD(&discard_q);
1164
1165 spin_lock_bh(&target->tx_lock);
1166
1167 list_for_each_entry_safe(packet, tmp_pkt, &endpoint->txq, list) {
1168 if ((tag == HTC_TX_PACKET_TAG_ALL) ||
1169 (tag == packet->info.tx.tag))
1170 list_move_tail(&packet->list, &discard_q);
1171 }
1172
1173 spin_unlock_bh(&target->tx_lock);
1174
1175 list_for_each_entry_safe(packet, tmp_pkt, &discard_q, list) {
1176 packet->status = -ECANCELED;
1177 list_del(&packet->list);
1178 ath6kl_dbg(ATH6KL_DBG_HTC,
1179 "htc tx flushing pkt 0x%p len %d ep %d tag 0x%x\n",
1180 packet, packet->act_len,
1181 packet->endpoint, packet->info.tx.tag);
1182
1183 INIT_LIST_HEAD(&container);
1184 list_add_tail(&packet->list, &container);
1185 htc_tx_complete(endpoint, &container);
1186 }
1187 }
1188
1189 static void ath6kl_htc_flush_txep_all(struct htc_target *target)
1190 {
1191 struct htc_endpoint *endpoint;
1192 int i;
1193
1194 dump_cred_dist_stats(target);
1195
1196 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
1197 endpoint = &target->endpoint[i];
1198 if (endpoint->svc_id == 0)
1199 /* not in use.. */
1200 continue;
1201 ath6kl_htc_mbox_flush_txep(target, i, HTC_TX_PACKET_TAG_ALL);
1202 }
1203 }
1204
1205 static void ath6kl_htc_mbox_activity_changed(struct htc_target *target,
1206 enum htc_endpoint_id eid,
1207 bool active)
1208 {
1209 struct htc_endpoint *endpoint = &target->endpoint[eid];
1210 bool dist = false;
1211
1212 if (endpoint->svc_id == 0) {
1213 WARN_ON(1);
1214 return;
1215 }
1216
1217 spin_lock_bh(&target->tx_lock);
1218
1219 if (active) {
1220 if (!(endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE)) {
1221 endpoint->cred_dist.dist_flags |= HTC_EP_ACTIVE;
1222 dist = true;
1223 }
1224 } else {
1225 if (endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE) {
1226 endpoint->cred_dist.dist_flags &= ~HTC_EP_ACTIVE;
1227 dist = true;
1228 }
1229 }
1230
1231 if (dist) {
1232 endpoint->cred_dist.txq_depth =
1233 get_queue_depth(&endpoint->txq);
1234
1235 ath6kl_dbg(ATH6KL_DBG_HTC,
1236 "htc tx activity ctxt 0x%p dist 0x%p\n",
1237 target->credit_info, &target->cred_dist_list);
1238
1239 ath6kl_credit_distribute(target->credit_info,
1240 &target->cred_dist_list,
1241 HTC_CREDIT_DIST_ACTIVITY_CHANGE);
1242 }
1243
1244 spin_unlock_bh(&target->tx_lock);
1245
1246 if (dist && !active)
1247 htc_chk_ep_txq(target);
1248 }
1249
1250 /* HTC Rx */
1251
1252 static inline void ath6kl_htc_rx_update_stats(struct htc_endpoint *endpoint,
1253 int n_look_ahds)
1254 {
1255 endpoint->ep_st.rx_pkts++;
1256 if (n_look_ahds == 1)
1257 endpoint->ep_st.rx_lkahds++;
1258 else if (n_look_ahds > 1)
1259 endpoint->ep_st.rx_bundle_lkahd++;
1260 }
1261
1262 static inline bool htc_valid_rx_frame_len(struct htc_target *target,
1263 enum htc_endpoint_id eid, int len)
1264 {
1265 return (eid == target->dev->ar->ctrl_ep) ?
1266 len <= ATH6KL_BUFFER_SIZE : len <= ATH6KL_AMSDU_BUFFER_SIZE;
1267 }
1268
1269 static int htc_add_rxbuf(struct htc_target *target, struct htc_packet *packet)
1270 {
1271 struct list_head queue;
1272
1273 INIT_LIST_HEAD(&queue);
1274 list_add_tail(&packet->list, &queue);
1275 return ath6kl_htc_mbox_add_rxbuf_multiple(target, &queue);
1276 }
1277
1278 static void htc_reclaim_rxbuf(struct htc_target *target,
1279 struct htc_packet *packet,
1280 struct htc_endpoint *ep)
1281 {
1282 if (packet->info.rx.rx_flags & HTC_RX_PKT_NO_RECYCLE) {
1283 htc_rxpkt_reset(packet);
1284 packet->status = -ECANCELED;
1285 ep->ep_cb.rx(ep->target, packet);
1286 } else {
1287 htc_rxpkt_reset(packet);
1288 htc_add_rxbuf((void *)(target), packet);
1289 }
1290 }
1291
1292 static void reclaim_rx_ctrl_buf(struct htc_target *target,
1293 struct htc_packet *packet)
1294 {
1295 spin_lock_bh(&target->htc_lock);
1296 list_add_tail(&packet->list, &target->free_ctrl_rxbuf);
1297 spin_unlock_bh(&target->htc_lock);
1298 }
1299
1300 static int ath6kl_htc_rx_packet(struct htc_target *target,
1301 struct htc_packet *packet,
1302 u32 rx_len)
1303 {
1304 struct ath6kl_device *dev = target->dev;
1305 u32 padded_len;
1306 int status;
1307
1308 padded_len = CALC_TXRX_PADDED_LEN(target, rx_len);
1309
1310 if (padded_len > packet->buf_len) {
1311 ath6kl_err("not enough receive space for packet - padlen %d recvlen %d bufferlen %d\n",
1312 padded_len, rx_len, packet->buf_len);
1313 return -ENOMEM;
1314 }
1315
1316 ath6kl_dbg(ATH6KL_DBG_HTC,
1317 "htc rx 0x%p hdr 0x%x len %d mbox 0x%x\n",
1318 packet, packet->info.rx.exp_hdr,
1319 padded_len, dev->ar->mbox_info.htc_addr);
1320
1321 status = hif_read_write_sync(dev->ar,
1322 dev->ar->mbox_info.htc_addr,
1323 packet->buf, padded_len,
1324 HIF_RD_SYNC_BLOCK_FIX);
1325
1326 packet->status = status;
1327
1328 return status;
1329 }
1330
1331 /*
1332 * optimization for recv packets, we can indicate a
1333 * "hint" that there are more single-packets to fetch
1334 * on this endpoint.
1335 */
1336 static void ath6kl_htc_rx_set_indicate(u32 lk_ahd,
1337 struct htc_endpoint *endpoint,
1338 struct htc_packet *packet)
1339 {
1340 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)&lk_ahd;
1341
1342 if (htc_hdr->eid == packet->endpoint) {
1343 if (!list_empty(&endpoint->rx_bufq))
1344 packet->info.rx.indicat_flags |=
1345 HTC_RX_FLAGS_INDICATE_MORE_PKTS;
1346 }
1347 }
1348
1349 static void ath6kl_htc_rx_chk_water_mark(struct htc_endpoint *endpoint)
1350 {
1351 struct htc_ep_callbacks ep_cb = endpoint->ep_cb;
1352
1353 if (ep_cb.rx_refill_thresh > 0) {
1354 spin_lock_bh(&endpoint->target->rx_lock);
1355 if (get_queue_depth(&endpoint->rx_bufq)
1356 < ep_cb.rx_refill_thresh) {
1357 spin_unlock_bh(&endpoint->target->rx_lock);
1358 ep_cb.rx_refill(endpoint->target, endpoint->eid);
1359 return;
1360 }
1361 spin_unlock_bh(&endpoint->target->rx_lock);
1362 }
1363 }
1364
1365 /* This function is called with rx_lock held */
1366 static int ath6kl_htc_rx_setup(struct htc_target *target,
1367 struct htc_endpoint *ep,
1368 u32 *lk_ahds, struct list_head *queue, int n_msg)
1369 {
1370 struct htc_packet *packet;
1371 /* FIXME: type of lk_ahds can't be right */
1372 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)lk_ahds;
1373 struct htc_ep_callbacks ep_cb;
1374 int status = 0, j, full_len;
1375 bool no_recycle;
1376
1377 full_len = CALC_TXRX_PADDED_LEN(target,
1378 le16_to_cpu(htc_hdr->payld_len) +
1379 sizeof(*htc_hdr));
1380
1381 if (!htc_valid_rx_frame_len(target, ep->eid, full_len)) {
1382 ath6kl_warn("Rx buffer requested with invalid length htc_hdr:eid %d, flags 0x%x, len %d\n",
1383 htc_hdr->eid, htc_hdr->flags,
1384 le16_to_cpu(htc_hdr->payld_len));
1385 return -EINVAL;
1386 }
1387
1388 ep_cb = ep->ep_cb;
1389 for (j = 0; j < n_msg; j++) {
1390 /*
1391 * Reset flag, any packets allocated using the
1392 * rx_alloc() API cannot be recycled on
1393 * cleanup,they must be explicitly returned.
1394 */
1395 no_recycle = false;
1396
1397 if (ep_cb.rx_allocthresh &&
1398 (full_len > ep_cb.rx_alloc_thresh)) {
1399 ep->ep_st.rx_alloc_thresh_hit += 1;
1400 ep->ep_st.rxalloc_thresh_byte +=
1401 le16_to_cpu(htc_hdr->payld_len);
1402
1403 spin_unlock_bh(&target->rx_lock);
1404 no_recycle = true;
1405
1406 packet = ep_cb.rx_allocthresh(ep->target, ep->eid,
1407 full_len);
1408 spin_lock_bh(&target->rx_lock);
1409 } else {
1410 /* refill handler is being used */
1411 if (list_empty(&ep->rx_bufq)) {
1412 if (ep_cb.rx_refill) {
1413 spin_unlock_bh(&target->rx_lock);
1414 ep_cb.rx_refill(ep->target, ep->eid);
1415 spin_lock_bh(&target->rx_lock);
1416 }
1417 }
1418
1419 if (list_empty(&ep->rx_bufq)) {
1420 packet = NULL;
1421 } else {
1422 packet = list_first_entry(&ep->rx_bufq,
1423 struct htc_packet, list);
1424 list_del(&packet->list);
1425 }
1426 }
1427
1428 if (!packet) {
1429 target->rx_st_flags |= HTC_RECV_WAIT_BUFFERS;
1430 target->ep_waiting = ep->eid;
1431 return -ENOSPC;
1432 }
1433
1434 /* clear flags */
1435 packet->info.rx.rx_flags = 0;
1436 packet->info.rx.indicat_flags = 0;
1437 packet->status = 0;
1438
1439 if (no_recycle)
1440 /*
1441 * flag that these packets cannot be
1442 * recycled, they have to be returned to
1443 * the user
1444 */
1445 packet->info.rx.rx_flags |= HTC_RX_PKT_NO_RECYCLE;
1446
1447 /* Caller needs to free this upon any failure */
1448 list_add_tail(&packet->list, queue);
1449
1450 if (target->htc_flags & HTC_OP_STATE_STOPPING) {
1451 status = -ECANCELED;
1452 break;
1453 }
1454
1455 if (j) {
1456 packet->info.rx.rx_flags |= HTC_RX_PKT_REFRESH_HDR;
1457 packet->info.rx.exp_hdr = 0xFFFFFFFF;
1458 } else
1459 /* set expected look ahead */
1460 packet->info.rx.exp_hdr = *lk_ahds;
1461
1462 packet->act_len = le16_to_cpu(htc_hdr->payld_len) +
1463 HTC_HDR_LENGTH;
1464 }
1465
1466 return status;
1467 }
1468
1469 static int ath6kl_htc_rx_alloc(struct htc_target *target,
1470 u32 lk_ahds[], int msg,
1471 struct htc_endpoint *endpoint,
1472 struct list_head *queue)
1473 {
1474 int status = 0;
1475 struct htc_packet *packet, *tmp_pkt;
1476 struct htc_frame_hdr *htc_hdr;
1477 int i, n_msg;
1478
1479 spin_lock_bh(&target->rx_lock);
1480
1481 for (i = 0; i < msg; i++) {
1482 htc_hdr = (struct htc_frame_hdr *)&lk_ahds[i];
1483
1484 if (htc_hdr->eid >= ENDPOINT_MAX) {
1485 ath6kl_err("invalid ep in look-ahead: %d\n",
1486 htc_hdr->eid);
1487 status = -ENOMEM;
1488 break;
1489 }
1490
1491 if (htc_hdr->eid != endpoint->eid) {
1492 ath6kl_err("invalid ep in look-ahead: %d should be : %d (index:%d)\n",
1493 htc_hdr->eid, endpoint->eid, i);
1494 status = -ENOMEM;
1495 break;
1496 }
1497
1498 if (le16_to_cpu(htc_hdr->payld_len) > HTC_MAX_PAYLOAD_LENGTH) {
1499 ath6kl_err("payload len %d exceeds max htc : %d !\n",
1500 htc_hdr->payld_len,
1501 (u32) HTC_MAX_PAYLOAD_LENGTH);
1502 status = -ENOMEM;
1503 break;
1504 }
1505
1506 if (endpoint->svc_id == 0) {
1507 ath6kl_err("ep %d is not connected !\n", htc_hdr->eid);
1508 status = -ENOMEM;
1509 break;
1510 }
1511
1512 if (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) {
1513 /*
1514 * HTC header indicates that every packet to follow
1515 * has the same padded length so that it can be
1516 * optimally fetched as a full bundle.
1517 */
1518 n_msg = (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) >>
1519 HTC_FLG_RX_BNDL_CNT_S;
1520
1521 /* the count doesn't include the starter frame */
1522 n_msg++;
1523 if (n_msg > target->msg_per_bndl_max) {
1524 status = -ENOMEM;
1525 break;
1526 }
1527
1528 endpoint->ep_st.rx_bundle_from_hdr += 1;
1529 ath6kl_dbg(ATH6KL_DBG_HTC,
1530 "htc rx bundle pkts %d\n",
1531 n_msg);
1532 } else
1533 /* HTC header only indicates 1 message to fetch */
1534 n_msg = 1;
1535
1536 /* Setup packet buffers for each message */
1537 status = ath6kl_htc_rx_setup(target, endpoint, &lk_ahds[i],
1538 queue, n_msg);
1539
1540 /*
1541 * This is due to unavailabilty of buffers to rx entire data.
1542 * Return no error so that free buffers from queue can be used
1543 * to receive partial data.
1544 */
1545 if (status == -ENOSPC) {
1546 spin_unlock_bh(&target->rx_lock);
1547 return 0;
1548 }
1549
1550 if (status)
1551 break;
1552 }
1553
1554 spin_unlock_bh(&target->rx_lock);
1555
1556 if (status) {
1557 list_for_each_entry_safe(packet, tmp_pkt, queue, list) {
1558 list_del(&packet->list);
1559 htc_reclaim_rxbuf(target, packet,
1560 &target->endpoint[packet->endpoint]);
1561 }
1562 }
1563
1564 return status;
1565 }
1566
1567 static void htc_ctrl_rx(struct htc_target *context, struct htc_packet *packets)
1568 {
1569 if (packets->endpoint != ENDPOINT_0) {
1570 WARN_ON(1);
1571 return;
1572 }
1573
1574 if (packets->status == -ECANCELED) {
1575 reclaim_rx_ctrl_buf(context, packets);
1576 return;
1577 }
1578
1579 if (packets->act_len > 0) {
1580 ath6kl_err("htc_ctrl_rx, got message with len:%zu\n",
1581 packets->act_len + HTC_HDR_LENGTH);
1582
1583 ath6kl_dbg_dump(ATH6KL_DBG_HTC,
1584 "htc rx unexpected endpoint 0 message", "",
1585 packets->buf - HTC_HDR_LENGTH,
1586 packets->act_len + HTC_HDR_LENGTH);
1587 }
1588
1589 htc_reclaim_rxbuf(context, packets, &context->endpoint[0]);
1590 }
1591
1592 static void htc_proc_cred_rpt(struct htc_target *target,
1593 struct htc_credit_report *rpt,
1594 int n_entries,
1595 enum htc_endpoint_id from_ep)
1596 {
1597 struct htc_endpoint *endpoint;
1598 int tot_credits = 0, i;
1599 bool dist = false;
1600
1601 spin_lock_bh(&target->tx_lock);
1602
1603 for (i = 0; i < n_entries; i++, rpt++) {
1604 if (rpt->eid >= ENDPOINT_MAX) {
1605 WARN_ON(1);
1606 spin_unlock_bh(&target->tx_lock);
1607 return;
1608 }
1609
1610 endpoint = &target->endpoint[rpt->eid];
1611
1612 ath6kl_dbg(ATH6KL_DBG_CREDIT,
1613 "credit report ep %d credits %d\n",
1614 rpt->eid, rpt->credits);
1615
1616 endpoint->ep_st.tx_cred_rpt += 1;
1617 endpoint->ep_st.cred_retnd += rpt->credits;
1618
1619 if (from_ep == rpt->eid) {
1620 /*
1621 * This credit report arrived on the same endpoint
1622 * indicating it arrived in an RX packet.
1623 */
1624 endpoint->ep_st.cred_from_rx += rpt->credits;
1625 endpoint->ep_st.cred_rpt_from_rx += 1;
1626 } else if (from_ep == ENDPOINT_0) {
1627 /* credit arrived on endpoint 0 as a NULL message */
1628 endpoint->ep_st.cred_from_ep0 += rpt->credits;
1629 endpoint->ep_st.cred_rpt_ep0 += 1;
1630 } else {
1631 endpoint->ep_st.cred_from_other += rpt->credits;
1632 endpoint->ep_st.cred_rpt_from_other += 1;
1633 }
1634
1635 if (rpt->eid == ENDPOINT_0)
1636 /* always give endpoint 0 credits back */
1637 endpoint->cred_dist.credits += rpt->credits;
1638 else {
1639 endpoint->cred_dist.cred_to_dist += rpt->credits;
1640 dist = true;
1641 }
1642
1643 /*
1644 * Refresh tx depth for distribution function that will
1645 * recover these credits NOTE: this is only valid when
1646 * there are credits to recover!
1647 */
1648 endpoint->cred_dist.txq_depth =
1649 get_queue_depth(&endpoint->txq);
1650
1651 tot_credits += rpt->credits;
1652 }
1653
1654 if (dist) {
1655 /*
1656 * This was a credit return based on a completed send
1657 * operations note, this is done with the lock held
1658 */
1659 ath6kl_credit_distribute(target->credit_info,
1660 &target->cred_dist_list,
1661 HTC_CREDIT_DIST_SEND_COMPLETE);
1662 }
1663
1664 spin_unlock_bh(&target->tx_lock);
1665
1666 if (tot_credits)
1667 htc_chk_ep_txq(target);
1668 }
1669
1670 static int htc_parse_trailer(struct htc_target *target,
1671 struct htc_record_hdr *record,
1672 u8 *record_buf, u32 *next_lk_ahds,
1673 enum htc_endpoint_id endpoint,
1674 int *n_lk_ahds)
1675 {
1676 struct htc_bundle_lkahd_rpt *bundle_lkahd_rpt;
1677 struct htc_lookahead_report *lk_ahd;
1678 int len;
1679
1680 switch (record->rec_id) {
1681 case HTC_RECORD_CREDITS:
1682 len = record->len / sizeof(struct htc_credit_report);
1683 if (!len) {
1684 WARN_ON(1);
1685 return -EINVAL;
1686 }
1687
1688 htc_proc_cred_rpt(target,
1689 (struct htc_credit_report *) record_buf,
1690 len, endpoint);
1691 break;
1692 case HTC_RECORD_LOOKAHEAD:
1693 len = record->len / sizeof(*lk_ahd);
1694 if (!len) {
1695 WARN_ON(1);
1696 return -EINVAL;
1697 }
1698
1699 lk_ahd = (struct htc_lookahead_report *) record_buf;
1700 if ((lk_ahd->pre_valid == ((~lk_ahd->post_valid) & 0xFF)) &&
1701 next_lk_ahds) {
1702 ath6kl_dbg(ATH6KL_DBG_HTC,
1703 "htc rx lk_ahd found pre_valid 0x%x post_valid 0x%x\n",
1704 lk_ahd->pre_valid, lk_ahd->post_valid);
1705
1706 /* look ahead bytes are valid, copy them over */
1707 memcpy((u8 *)&next_lk_ahds[0], lk_ahd->lk_ahd, 4);
1708
1709 ath6kl_dbg_dump(ATH6KL_DBG_HTC,
1710 "htc rx next look ahead",
1711 "", next_lk_ahds, 4);
1712
1713 *n_lk_ahds = 1;
1714 }
1715 break;
1716 case HTC_RECORD_LOOKAHEAD_BUNDLE:
1717 len = record->len / sizeof(*bundle_lkahd_rpt);
1718 if (!len || (len > HTC_HOST_MAX_MSG_PER_BUNDLE)) {
1719 WARN_ON(1);
1720 return -EINVAL;
1721 }
1722
1723 if (next_lk_ahds) {
1724 int i;
1725
1726 bundle_lkahd_rpt =
1727 (struct htc_bundle_lkahd_rpt *) record_buf;
1728
1729 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bundle lk_ahd",
1730 "", record_buf, record->len);
1731
1732 for (i = 0; i < len; i++) {
1733 memcpy((u8 *)&next_lk_ahds[i],
1734 bundle_lkahd_rpt->lk_ahd, 4);
1735 bundle_lkahd_rpt++;
1736 }
1737
1738 *n_lk_ahds = i;
1739 }
1740 break;
1741 default:
1742 ath6kl_err("unhandled record: id:%d len:%d\n",
1743 record->rec_id, record->len);
1744 break;
1745 }
1746
1747 return 0;
1748 }
1749
1750 static int htc_proc_trailer(struct htc_target *target,
1751 u8 *buf, int len, u32 *next_lk_ahds,
1752 int *n_lk_ahds, enum htc_endpoint_id endpoint)
1753 {
1754 struct htc_record_hdr *record;
1755 int orig_len;
1756 int status;
1757 u8 *record_buf;
1758 u8 *orig_buf;
1759
1760 ath6kl_dbg(ATH6KL_DBG_HTC, "htc rx trailer len %d\n", len);
1761 ath6kl_dbg_dump(ATH6KL_DBG_HTC, NULL, "", buf, len);
1762
1763 orig_buf = buf;
1764 orig_len = len;
1765 status = 0;
1766
1767 while (len > 0) {
1768 if (len < sizeof(struct htc_record_hdr)) {
1769 status = -ENOMEM;
1770 break;
1771 }
1772 /* these are byte aligned structs */
1773 record = (struct htc_record_hdr *) buf;
1774 len -= sizeof(struct htc_record_hdr);
1775 buf += sizeof(struct htc_record_hdr);
1776
1777 if (record->len > len) {
1778 ath6kl_err("invalid record len: %d (id:%d) buf has: %d bytes left\n",
1779 record->len, record->rec_id, len);
1780 status = -ENOMEM;
1781 break;
1782 }
1783 record_buf = buf;
1784
1785 status = htc_parse_trailer(target, record, record_buf,
1786 next_lk_ahds, endpoint, n_lk_ahds);
1787
1788 if (status)
1789 break;
1790
1791 /* advance buffer past this record for next time around */
1792 buf += record->len;
1793 len -= record->len;
1794 }
1795
1796 if (status)
1797 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad trailer",
1798 "", orig_buf, orig_len);
1799
1800 return status;
1801 }
1802
1803 static int ath6kl_htc_rx_process_hdr(struct htc_target *target,
1804 struct htc_packet *packet,
1805 u32 *next_lkahds, int *n_lkahds)
1806 {
1807 int status = 0;
1808 u16 payload_len;
1809 u32 lk_ahd;
1810 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)packet->buf;
1811
1812 if (n_lkahds != NULL)
1813 *n_lkahds = 0;
1814
1815 /*
1816 * NOTE: we cannot assume the alignment of buf, so we use the safe
1817 * macros to retrieve 16 bit fields.
1818 */
1819 payload_len = le16_to_cpu(get_unaligned(&htc_hdr->payld_len));
1820
1821 memcpy((u8 *)&lk_ahd, packet->buf, sizeof(lk_ahd));
1822
1823 if (packet->info.rx.rx_flags & HTC_RX_PKT_REFRESH_HDR) {
1824 /*
1825 * Refresh the expected header and the actual length as it
1826 * was unknown when this packet was grabbed as part of the
1827 * bundle.
1828 */
1829 packet->info.rx.exp_hdr = lk_ahd;
1830 packet->act_len = payload_len + HTC_HDR_LENGTH;
1831
1832 /* validate the actual header that was refreshed */
1833 if (packet->act_len > packet->buf_len) {
1834 ath6kl_err("refreshed hdr payload len (%d) in bundled recv is invalid (hdr: 0x%X)\n",
1835 payload_len, lk_ahd);
1836 /*
1837 * Limit this to max buffer just to print out some
1838 * of the buffer.
1839 */
1840 packet->act_len = min(packet->act_len, packet->buf_len);
1841 status = -ENOMEM;
1842 goto fail_rx;
1843 }
1844
1845 if (packet->endpoint != htc_hdr->eid) {
1846 ath6kl_err("refreshed hdr ep (%d) does not match expected ep (%d)\n",
1847 htc_hdr->eid, packet->endpoint);
1848 status = -ENOMEM;
1849 goto fail_rx;
1850 }
1851 }
1852
1853 if (lk_ahd != packet->info.rx.exp_hdr) {
1854 ath6kl_err("%s(): lk_ahd mismatch! (pPkt:0x%p flags:0x%X)\n",
1855 __func__, packet, packet->info.rx.rx_flags);
1856 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx expected lk_ahd",
1857 "", &packet->info.rx.exp_hdr, 4);
1858 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx current header",
1859 "", (u8 *)&lk_ahd, sizeof(lk_ahd));
1860 status = -ENOMEM;
1861 goto fail_rx;
1862 }
1863
1864 if (htc_hdr->flags & HTC_FLG_RX_TRAILER) {
1865 if (htc_hdr->ctrl[0] < sizeof(struct htc_record_hdr) ||
1866 htc_hdr->ctrl[0] > payload_len) {
1867 ath6kl_err("%s(): invalid hdr (payload len should be :%d, CB[0] is:%d)\n",
1868 __func__, payload_len, htc_hdr->ctrl[0]);
1869 status = -ENOMEM;
1870 goto fail_rx;
1871 }
1872
1873 if (packet->info.rx.rx_flags & HTC_RX_PKT_IGNORE_LOOKAHEAD) {
1874 next_lkahds = NULL;
1875 n_lkahds = NULL;
1876 }
1877
1878 status = htc_proc_trailer(target, packet->buf + HTC_HDR_LENGTH
1879 + payload_len - htc_hdr->ctrl[0],
1880 htc_hdr->ctrl[0], next_lkahds,
1881 n_lkahds, packet->endpoint);
1882
1883 if (status)
1884 goto fail_rx;
1885
1886 packet->act_len -= htc_hdr->ctrl[0];
1887 }
1888
1889 packet->buf += HTC_HDR_LENGTH;
1890 packet->act_len -= HTC_HDR_LENGTH;
1891
1892 fail_rx:
1893 if (status)
1894 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad packet",
1895 "", packet->buf, packet->act_len);
1896
1897 return status;
1898 }
1899
1900 static void ath6kl_htc_rx_complete(struct htc_endpoint *endpoint,
1901 struct htc_packet *packet)
1902 {
1903 ath6kl_dbg(ATH6KL_DBG_HTC,
1904 "htc rx complete ep %d packet 0x%p\n",
1905 endpoint->eid, packet);
1906
1907 endpoint->ep_cb.rx(endpoint->target, packet);
1908 }
1909
1910 static int ath6kl_htc_rx_bundle(struct htc_target *target,
1911 struct list_head *rxq,
1912 struct list_head *sync_compq,
1913 int *n_pkt_fetched, bool part_bundle)
1914 {
1915 struct hif_scatter_req *scat_req;
1916 struct htc_packet *packet;
1917 int rem_space = target->max_rx_bndl_sz;
1918 int n_scat_pkt, status = 0, i, len;
1919
1920 n_scat_pkt = get_queue_depth(rxq);
1921 n_scat_pkt = min(n_scat_pkt, target->msg_per_bndl_max);
1922
1923 if ((get_queue_depth(rxq) - n_scat_pkt) > 0) {
1924 /*
1925 * We were forced to split this bundle receive operation
1926 * all packets in this partial bundle must have their
1927 * lookaheads ignored.
1928 */
1929 part_bundle = true;
1930
1931 /*
1932 * This would only happen if the target ignored our max
1933 * bundle limit.
1934 */
1935 ath6kl_warn("%s(): partial bundle detected num:%d , %d\n",
1936 __func__, get_queue_depth(rxq), n_scat_pkt);
1937 }
1938
1939 len = 0;
1940
1941 ath6kl_dbg(ATH6KL_DBG_HTC,
1942 "htc rx bundle depth %d pkts %d\n",
1943 get_queue_depth(rxq), n_scat_pkt);
1944
1945 scat_req = hif_scatter_req_get(target->dev->ar);
1946
1947 if (scat_req == NULL)
1948 goto fail_rx_pkt;
1949
1950 for (i = 0; i < n_scat_pkt; i++) {
1951 int pad_len;
1952
1953 packet = list_first_entry(rxq, struct htc_packet, list);
1954 list_del(&packet->list);
1955
1956 pad_len = CALC_TXRX_PADDED_LEN(target,
1957 packet->act_len);
1958
1959 if ((rem_space - pad_len) < 0) {
1960 list_add(&packet->list, rxq);
1961 break;
1962 }
1963
1964 rem_space -= pad_len;
1965
1966 if (part_bundle || (i < (n_scat_pkt - 1)))
1967 /*
1968 * Packet 0..n-1 cannot be checked for look-aheads
1969 * since we are fetching a bundle the last packet
1970 * however can have it's lookahead used
1971 */
1972 packet->info.rx.rx_flags |=
1973 HTC_RX_PKT_IGNORE_LOOKAHEAD;
1974
1975 /* NOTE: 1 HTC packet per scatter entry */
1976 scat_req->scat_list[i].buf = packet->buf;
1977 scat_req->scat_list[i].len = pad_len;
1978
1979 packet->info.rx.rx_flags |= HTC_RX_PKT_PART_OF_BUNDLE;
1980
1981 list_add_tail(&packet->list, sync_compq);
1982
1983 WARN_ON(!scat_req->scat_list[i].len);
1984 len += scat_req->scat_list[i].len;
1985 }
1986
1987 scat_req->len = len;
1988 scat_req->scat_entries = i;
1989
1990 status = ath6kl_hif_submit_scat_req(target->dev, scat_req, true);
1991
1992 if (!status)
1993 *n_pkt_fetched = i;
1994
1995 /* free scatter request */
1996 hif_scatter_req_add(target->dev->ar, scat_req);
1997
1998 fail_rx_pkt:
1999
2000 return status;
2001 }
2002
2003 static int ath6kl_htc_rx_process_packets(struct htc_target *target,
2004 struct list_head *comp_pktq,
2005 u32 lk_ahds[],
2006 int *n_lk_ahd)
2007 {
2008 struct htc_packet *packet, *tmp_pkt;
2009 struct htc_endpoint *ep;
2010 int status = 0;
2011
2012 list_for_each_entry_safe(packet, tmp_pkt, comp_pktq, list) {
2013 ep = &target->endpoint[packet->endpoint];
2014
2015 trace_ath6kl_htc_rx(packet->status, packet->endpoint,
2016 packet->buf, packet->act_len);
2017
2018 /* process header for each of the recv packet */
2019 status = ath6kl_htc_rx_process_hdr(target, packet, lk_ahds,
2020 n_lk_ahd);
2021 if (status)
2022 return status;
2023
2024 list_del(&packet->list);
2025
2026 if (list_empty(comp_pktq)) {
2027 /*
2028 * Last packet's more packet flag is set
2029 * based on the lookahead.
2030 */
2031 if (*n_lk_ahd > 0)
2032 ath6kl_htc_rx_set_indicate(lk_ahds[0],
2033 ep, packet);
2034 } else
2035 /*
2036 * Packets in a bundle automatically have
2037 * this flag set.
2038 */
2039 packet->info.rx.indicat_flags |=
2040 HTC_RX_FLAGS_INDICATE_MORE_PKTS;
2041
2042 ath6kl_htc_rx_update_stats(ep, *n_lk_ahd);
2043
2044 if (packet->info.rx.rx_flags & HTC_RX_PKT_PART_OF_BUNDLE)
2045 ep->ep_st.rx_bundl += 1;
2046
2047 ath6kl_htc_rx_complete(ep, packet);
2048 }
2049
2050 return status;
2051 }
2052
2053 static int ath6kl_htc_rx_fetch(struct htc_target *target,
2054 struct list_head *rx_pktq,
2055 struct list_head *comp_pktq)
2056 {
2057 int fetched_pkts;
2058 bool part_bundle = false;
2059 int status = 0;
2060 struct list_head tmp_rxq;
2061 struct htc_packet *packet, *tmp_pkt;
2062
2063 /* now go fetch the list of HTC packets */
2064 while (!list_empty(rx_pktq)) {
2065 fetched_pkts = 0;
2066
2067 INIT_LIST_HEAD(&tmp_rxq);
2068
2069 if (target->rx_bndl_enable && (get_queue_depth(rx_pktq) > 1)) {
2070 /*
2071 * There are enough packets to attempt a
2072 * bundle transfer and recv bundling is
2073 * allowed.
2074 */
2075 status = ath6kl_htc_rx_bundle(target, rx_pktq,
2076 &tmp_rxq,
2077 &fetched_pkts,
2078 part_bundle);
2079 if (status)
2080 goto fail_rx;
2081
2082 if (!list_empty(rx_pktq))
2083 part_bundle = true;
2084
2085 list_splice_tail_init(&tmp_rxq, comp_pktq);
2086 }
2087
2088 if (!fetched_pkts) {
2089 packet = list_first_entry(rx_pktq, struct htc_packet,
2090 list);
2091
2092 /* fully synchronous */
2093 packet->completion = NULL;
2094
2095 if (!list_is_singular(rx_pktq))
2096 /*
2097 * look_aheads in all packet
2098 * except the last one in the
2099 * bundle must be ignored
2100 */
2101 packet->info.rx.rx_flags |=
2102 HTC_RX_PKT_IGNORE_LOOKAHEAD;
2103
2104 /* go fetch the packet */
2105 status = ath6kl_htc_rx_packet(target, packet,
2106 packet->act_len);
2107
2108 list_move_tail(&packet->list, &tmp_rxq);
2109
2110 if (status)
2111 goto fail_rx;
2112
2113 list_splice_tail_init(&tmp_rxq, comp_pktq);
2114 }
2115 }
2116
2117 return 0;
2118
2119 fail_rx:
2120
2121 /*
2122 * Cleanup any packets we allocated but didn't use to
2123 * actually fetch any packets.
2124 */
2125
2126 list_for_each_entry_safe(packet, tmp_pkt, rx_pktq, list) {
2127 list_del(&packet->list);
2128 htc_reclaim_rxbuf(target, packet,
2129 &target->endpoint[packet->endpoint]);
2130 }
2131
2132 list_for_each_entry_safe(packet, tmp_pkt, &tmp_rxq, list) {
2133 list_del(&packet->list);
2134 htc_reclaim_rxbuf(target, packet,
2135 &target->endpoint[packet->endpoint]);
2136 }
2137
2138 return status;
2139 }
2140
2141 int ath6kl_htc_rxmsg_pending_handler(struct htc_target *target,
2142 u32 msg_look_ahead, int *num_pkts)
2143 {
2144 struct htc_packet *packets, *tmp_pkt;
2145 struct htc_endpoint *endpoint;
2146 struct list_head rx_pktq, comp_pktq;
2147 int status = 0;
2148 u32 look_aheads[HTC_HOST_MAX_MSG_PER_BUNDLE];
2149 int num_look_ahead = 1;
2150 enum htc_endpoint_id id;
2151 int n_fetched = 0;
2152
2153 INIT_LIST_HEAD(&comp_pktq);
2154 *num_pkts = 0;
2155
2156 /*
2157 * On first entry copy the look_aheads into our temp array for
2158 * processing
2159 */
2160 look_aheads[0] = msg_look_ahead;
2161
2162 while (true) {
2163 /*
2164 * First lookahead sets the expected endpoint IDs for all
2165 * packets in a bundle.
2166 */
2167 id = ((struct htc_frame_hdr *)&look_aheads[0])->eid;
2168 endpoint = &target->endpoint[id];
2169
2170 if (id >= ENDPOINT_MAX) {
2171 ath6kl_err("MsgPend, invalid endpoint in look-ahead: %d\n",
2172 id);
2173 status = -ENOMEM;
2174 break;
2175 }
2176
2177 INIT_LIST_HEAD(&rx_pktq);
2178 INIT_LIST_HEAD(&comp_pktq);
2179
2180 /*
2181 * Try to allocate as many HTC RX packets indicated by the
2182 * look_aheads.
2183 */
2184 status = ath6kl_htc_rx_alloc(target, look_aheads,
2185 num_look_ahead, endpoint,
2186 &rx_pktq);
2187 if (status)
2188 break;
2189
2190 if (get_queue_depth(&rx_pktq) >= 2)
2191 /*
2192 * A recv bundle was detected, force IRQ status
2193 * re-check again
2194 */
2195 target->chk_irq_status_cnt = 1;
2196
2197 n_fetched += get_queue_depth(&rx_pktq);
2198
2199 num_look_ahead = 0;
2200
2201 status = ath6kl_htc_rx_fetch(target, &rx_pktq, &comp_pktq);
2202
2203 if (!status)
2204 ath6kl_htc_rx_chk_water_mark(endpoint);
2205
2206 /* Process fetched packets */
2207 status = ath6kl_htc_rx_process_packets(target, &comp_pktq,
2208 look_aheads,
2209 &num_look_ahead);
2210
2211 if (!num_look_ahead || status)
2212 break;
2213
2214 /*
2215 * For SYNCH processing, if we get here, we are running
2216 * through the loop again due to a detected lookahead. Set
2217 * flag that we should re-check IRQ status registers again
2218 * before leaving IRQ processing, this can net better
2219 * performance in high throughput situations.
2220 */
2221 target->chk_irq_status_cnt = 1;
2222 }
2223
2224 if (status) {
2225 if (status != -ECANCELED)
2226 ath6kl_err("failed to get pending recv messages: %d\n",
2227 status);
2228
2229 /* cleanup any packets in sync completion queue */
2230 list_for_each_entry_safe(packets, tmp_pkt, &comp_pktq, list) {
2231 list_del(&packets->list);
2232 htc_reclaim_rxbuf(target, packets,
2233 &target->endpoint[packets->endpoint]);
2234 }
2235
2236 if (target->htc_flags & HTC_OP_STATE_STOPPING) {
2237 ath6kl_warn("host is going to stop blocking receiver for htc_stop\n");
2238 ath6kl_hif_rx_control(target->dev, false);
2239 }
2240 }
2241
2242 /*
2243 * Before leaving, check to see if host ran out of buffers and
2244 * needs to stop the receiver.
2245 */
2246 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) {
2247 ath6kl_warn("host has no rx buffers blocking receiver to prevent overrun\n");
2248 ath6kl_hif_rx_control(target->dev, false);
2249 }
2250 *num_pkts = n_fetched;
2251
2252 return status;
2253 }
2254
2255 /*
2256 * Synchronously wait for a control message from the target,
2257 * This function is used at initialization time ONLY. At init messages
2258 * on ENDPOINT 0 are expected.
2259 */
2260 static struct htc_packet *htc_wait_for_ctrl_msg(struct htc_target *target)
2261 {
2262 struct htc_packet *packet = NULL;
2263 struct htc_frame_hdr *htc_hdr;
2264 u32 look_ahead;
2265
2266 if (ath6kl_hif_poll_mboxmsg_rx(target->dev, &look_ahead,
2267 HTC_TARGET_RESPONSE_TIMEOUT))
2268 return NULL;
2269
2270 ath6kl_dbg(ATH6KL_DBG_HTC,
2271 "htc rx wait ctrl look_ahead 0x%X\n", look_ahead);
2272
2273 htc_hdr = (struct htc_frame_hdr *)&look_ahead;
2274
2275 if (htc_hdr->eid != ENDPOINT_0)
2276 return NULL;
2277
2278 packet = htc_get_control_buf(target, false);
2279
2280 if (!packet)
2281 return NULL;
2282
2283 packet->info.rx.rx_flags = 0;
2284 packet->info.rx.exp_hdr = look_ahead;
2285 packet->act_len = le16_to_cpu(htc_hdr->payld_len) + HTC_HDR_LENGTH;
2286
2287 if (packet->act_len > packet->buf_len)
2288 goto fail_ctrl_rx;
2289
2290 /* we want synchronous operation */
2291 packet->completion = NULL;
2292
2293 /* get the message from the device, this will block */
2294 if (ath6kl_htc_rx_packet(target, packet, packet->act_len))
2295 goto fail_ctrl_rx;
2296
2297 trace_ath6kl_htc_rx(packet->status, packet->endpoint,
2298 packet->buf, packet->act_len);
2299
2300 /* process receive header */
2301 packet->status = ath6kl_htc_rx_process_hdr(target, packet, NULL, NULL);
2302
2303 if (packet->status) {
2304 ath6kl_err("htc_wait_for_ctrl_msg, ath6kl_htc_rx_process_hdr failed (status = %d)\n",
2305 packet->status);
2306 goto fail_ctrl_rx;
2307 }
2308
2309 return packet;
2310
2311 fail_ctrl_rx:
2312 if (packet != NULL) {
2313 htc_rxpkt_reset(packet);
2314 reclaim_rx_ctrl_buf(target, packet);
2315 }
2316
2317 return NULL;
2318 }
2319
2320 static int ath6kl_htc_mbox_add_rxbuf_multiple(struct htc_target *target,
2321 struct list_head *pkt_queue)
2322 {
2323 struct htc_endpoint *endpoint;
2324 struct htc_packet *first_pkt;
2325 bool rx_unblock = false;
2326 int status = 0, depth;
2327
2328 if (list_empty(pkt_queue))
2329 return -ENOMEM;
2330
2331 first_pkt = list_first_entry(pkt_queue, struct htc_packet, list);
2332
2333 if (first_pkt->endpoint >= ENDPOINT_MAX)
2334 return status;
2335
2336 depth = get_queue_depth(pkt_queue);
2337
2338 ath6kl_dbg(ATH6KL_DBG_HTC,
2339 "htc rx add multiple ep id %d cnt %d len %d\n",
2340 first_pkt->endpoint, depth, first_pkt->buf_len);
2341
2342 endpoint = &target->endpoint[first_pkt->endpoint];
2343
2344 if (target->htc_flags & HTC_OP_STATE_STOPPING) {
2345 struct htc_packet *packet, *tmp_pkt;
2346
2347 /* walk through queue and mark each one canceled */
2348 list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) {
2349 packet->status = -ECANCELED;
2350 list_del(&packet->list);
2351 ath6kl_htc_rx_complete(endpoint, packet);
2352 }
2353
2354 return status;
2355 }
2356
2357 spin_lock_bh(&target->rx_lock);
2358
2359 list_splice_tail_init(pkt_queue, &endpoint->rx_bufq);
2360
2361 /* check if we are blocked waiting for a new buffer */
2362 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) {
2363 if (target->ep_waiting == first_pkt->endpoint) {
2364 ath6kl_dbg(ATH6KL_DBG_HTC,
2365 "htc rx blocked on ep %d, unblocking\n",
2366 target->ep_waiting);
2367 target->rx_st_flags &= ~HTC_RECV_WAIT_BUFFERS;
2368 target->ep_waiting = ENDPOINT_MAX;
2369 rx_unblock = true;
2370 }
2371 }
2372
2373 spin_unlock_bh(&target->rx_lock);
2374
2375 if (rx_unblock && !(target->htc_flags & HTC_OP_STATE_STOPPING))
2376 /* TODO : implement a buffer threshold count? */
2377 ath6kl_hif_rx_control(target->dev, true);
2378
2379 return status;
2380 }
2381
2382 static void ath6kl_htc_mbox_flush_rx_buf(struct htc_target *target)
2383 {
2384 struct htc_endpoint *endpoint;
2385 struct htc_packet *packet, *tmp_pkt;
2386 int i;
2387
2388 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
2389 endpoint = &target->endpoint[i];
2390 if (!endpoint->svc_id)
2391 /* not in use.. */
2392 continue;
2393
2394 spin_lock_bh(&target->rx_lock);
2395 list_for_each_entry_safe(packet, tmp_pkt,
2396 &endpoint->rx_bufq, list) {
2397 list_del(&packet->list);
2398 spin_unlock_bh(&target->rx_lock);
2399 ath6kl_dbg(ATH6KL_DBG_HTC,
2400 "htc rx flush pkt 0x%p len %d ep %d\n",
2401 packet, packet->buf_len,
2402 packet->endpoint);
2403 /*
2404 * packets in rx_bufq of endpoint 0 have originally
2405 * been queued from target->free_ctrl_rxbuf where
2406 * packet and packet->buf_start are allocated
2407 * separately using kmalloc(). For other endpoint
2408 * rx_bufq, it is allocated as skb where packet is
2409 * skb->head. Take care of this difference while freeing
2410 * the memory.
2411 */
2412 if (packet->endpoint == ENDPOINT_0) {
2413 kfree(packet->buf_start);
2414 kfree(packet);
2415 } else {
2416 dev_kfree_skb(packet->pkt_cntxt);
2417 }
2418 spin_lock_bh(&target->rx_lock);
2419 }
2420 spin_unlock_bh(&target->rx_lock);
2421 }
2422 }
2423
2424 static int ath6kl_htc_mbox_conn_service(struct htc_target *target,
2425 struct htc_service_connect_req *conn_req,
2426 struct htc_service_connect_resp *conn_resp)
2427 {
2428 struct htc_packet *rx_pkt = NULL;
2429 struct htc_packet *tx_pkt = NULL;
2430 struct htc_conn_service_resp *resp_msg;
2431 struct htc_conn_service_msg *conn_msg;
2432 struct htc_endpoint *endpoint;
2433 enum htc_endpoint_id assigned_ep = ENDPOINT_MAX;
2434 unsigned int max_msg_sz = 0;
2435 int status = 0;
2436 u16 msg_id;
2437
2438 ath6kl_dbg(ATH6KL_DBG_HTC,
2439 "htc connect service target 0x%p service id 0x%x\n",
2440 target, conn_req->svc_id);
2441
2442 if (conn_req->svc_id == HTC_CTRL_RSVD_SVC) {
2443 /* special case for pseudo control service */
2444 assigned_ep = ENDPOINT_0;
2445 max_msg_sz = HTC_MAX_CTRL_MSG_LEN;
2446 } else {
2447 /* allocate a packet to send to the target */
2448 tx_pkt = htc_get_control_buf(target, true);
2449
2450 if (!tx_pkt)
2451 return -ENOMEM;
2452
2453 conn_msg = (struct htc_conn_service_msg *)tx_pkt->buf;
2454 memset(conn_msg, 0, sizeof(*conn_msg));
2455 conn_msg->msg_id = cpu_to_le16(HTC_MSG_CONN_SVC_ID);
2456 conn_msg->svc_id = cpu_to_le16(conn_req->svc_id);
2457 conn_msg->conn_flags = cpu_to_le16(conn_req->conn_flags);
2458
2459 set_htc_pkt_info(tx_pkt, NULL, (u8 *) conn_msg,
2460 sizeof(*conn_msg) + conn_msg->svc_meta_len,
2461 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
2462
2463 /* we want synchronous operation */
2464 tx_pkt->completion = NULL;
2465 ath6kl_htc_tx_prep_pkt(tx_pkt, 0, 0, 0);
2466 status = ath6kl_htc_tx_issue(target, tx_pkt);
2467
2468 if (status)
2469 goto fail_tx;
2470
2471 /* wait for response */
2472 rx_pkt = htc_wait_for_ctrl_msg(target);
2473
2474 if (!rx_pkt) {
2475 status = -ENOMEM;
2476 goto fail_tx;
2477 }
2478
2479 resp_msg = (struct htc_conn_service_resp *)rx_pkt->buf;
2480 msg_id = le16_to_cpu(resp_msg->msg_id);
2481
2482 if ((msg_id != HTC_MSG_CONN_SVC_RESP_ID) ||
2483 (rx_pkt->act_len < sizeof(*resp_msg))) {
2484 status = -ENOMEM;
2485 goto fail_tx;
2486 }
2487
2488 conn_resp->resp_code = resp_msg->status;
2489 /* check response status */
2490 if (resp_msg->status != HTC_SERVICE_SUCCESS) {
2491 ath6kl_err("target failed service 0x%X connect request (status:%d)\n",
2492 resp_msg->svc_id, resp_msg->status);
2493 status = -ENOMEM;
2494 goto fail_tx;
2495 }
2496
2497 assigned_ep = (enum htc_endpoint_id)resp_msg->eid;
2498 max_msg_sz = le16_to_cpu(resp_msg->max_msg_sz);
2499 }
2500
2501 if (WARN_ON_ONCE(assigned_ep == ENDPOINT_UNUSED ||
2502 assigned_ep >= ENDPOINT_MAX || !max_msg_sz)) {
2503 status = -ENOMEM;
2504 goto fail_tx;
2505 }
2506
2507 endpoint = &target->endpoint[assigned_ep];
2508 endpoint->eid = assigned_ep;
2509 if (endpoint->svc_id) {
2510 status = -ENOMEM;
2511 goto fail_tx;
2512 }
2513
2514 /* return assigned endpoint to caller */
2515 conn_resp->endpoint = assigned_ep;
2516 conn_resp->len_max = max_msg_sz;
2517
2518 /* setup the endpoint */
2519
2520 /* this marks the endpoint in use */
2521 endpoint->svc_id = conn_req->svc_id;
2522
2523 endpoint->max_txq_depth = conn_req->max_txq_depth;
2524 endpoint->len_max = max_msg_sz;
2525 endpoint->ep_cb = conn_req->ep_cb;
2526 endpoint->cred_dist.svc_id = conn_req->svc_id;
2527 endpoint->cred_dist.htc_ep = endpoint;
2528 endpoint->cred_dist.endpoint = assigned_ep;
2529 endpoint->cred_dist.cred_sz = target->tgt_cred_sz;
2530
2531 switch (endpoint->svc_id) {
2532 case WMI_DATA_BK_SVC:
2533 endpoint->tx_drop_packet_threshold = MAX_DEF_COOKIE_NUM / 3;
2534 break;
2535 default:
2536 endpoint->tx_drop_packet_threshold = MAX_HI_COOKIE_NUM;
2537 break;
2538 }
2539
2540 if (conn_req->max_rxmsg_sz) {
2541 /*
2542 * Override cred_per_msg calculation, this optimizes
2543 * the credit-low indications since the host will actually
2544 * issue smaller messages in the Send path.
2545 */
2546 if (conn_req->max_rxmsg_sz > max_msg_sz) {
2547 status = -ENOMEM;
2548 goto fail_tx;
2549 }
2550 endpoint->cred_dist.cred_per_msg =
2551 conn_req->max_rxmsg_sz / target->tgt_cred_sz;
2552 } else
2553 endpoint->cred_dist.cred_per_msg =
2554 max_msg_sz / target->tgt_cred_sz;
2555
2556 if (!endpoint->cred_dist.cred_per_msg)
2557 endpoint->cred_dist.cred_per_msg = 1;
2558
2559 /* save local connection flags */
2560 endpoint->conn_flags = conn_req->flags;
2561
2562 fail_tx:
2563 if (tx_pkt)
2564 htc_reclaim_txctrl_buf(target, tx_pkt);
2565
2566 if (rx_pkt) {
2567 htc_rxpkt_reset(rx_pkt);
2568 reclaim_rx_ctrl_buf(target, rx_pkt);
2569 }
2570
2571 return status;
2572 }
2573
2574 static void reset_ep_state(struct htc_target *target)
2575 {
2576 struct htc_endpoint *endpoint;
2577 int i;
2578
2579 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
2580 endpoint = &target->endpoint[i];
2581 memset(&endpoint->cred_dist, 0, sizeof(endpoint->cred_dist));
2582 endpoint->svc_id = 0;
2583 endpoint->len_max = 0;
2584 endpoint->max_txq_depth = 0;
2585 memset(&endpoint->ep_st, 0,
2586 sizeof(endpoint->ep_st));
2587 INIT_LIST_HEAD(&endpoint->rx_bufq);
2588 INIT_LIST_HEAD(&endpoint->txq);
2589 endpoint->target = target;
2590 }
2591
2592 /* reset distribution list */
2593 /* FIXME: free existing entries */
2594 INIT_LIST_HEAD(&target->cred_dist_list);
2595 }
2596
2597 static int ath6kl_htc_mbox_get_rxbuf_num(struct htc_target *target,
2598 enum htc_endpoint_id endpoint)
2599 {
2600 int num;
2601
2602 spin_lock_bh(&target->rx_lock);
2603 num = get_queue_depth(&(target->endpoint[endpoint].rx_bufq));
2604 spin_unlock_bh(&target->rx_lock);
2605 return num;
2606 }
2607
2608 static void htc_setup_msg_bndl(struct htc_target *target)
2609 {
2610 /* limit what HTC can handle */
2611 target->msg_per_bndl_max = min(HTC_HOST_MAX_MSG_PER_BUNDLE,
2612 target->msg_per_bndl_max);
2613
2614 if (ath6kl_hif_enable_scatter(target->dev->ar)) {
2615 target->msg_per_bndl_max = 0;
2616 return;
2617 }
2618
2619 /* limit bundle what the device layer can handle */
2620 target->msg_per_bndl_max = min(target->max_scat_entries,
2621 target->msg_per_bndl_max);
2622
2623 ath6kl_dbg(ATH6KL_DBG_BOOT,
2624 "htc bundling allowed msg_per_bndl_max %d\n",
2625 target->msg_per_bndl_max);
2626
2627 /* Max rx bundle size is limited by the max tx bundle size */
2628 target->max_rx_bndl_sz = target->max_xfer_szper_scatreq;
2629 /* Max tx bundle size if limited by the extended mbox address range */
2630 target->max_tx_bndl_sz = min(HIF_MBOX0_EXT_WIDTH,
2631 target->max_xfer_szper_scatreq);
2632
2633 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc max_rx_bndl_sz %d max_tx_bndl_sz %d\n",
2634 target->max_rx_bndl_sz, target->max_tx_bndl_sz);
2635
2636 if (target->max_tx_bndl_sz)
2637 /* tx_bndl_mask is enabled per AC, each has 1 bit */
2638 target->tx_bndl_mask = (1 << WMM_NUM_AC) - 1;
2639
2640 if (target->max_rx_bndl_sz)
2641 target->rx_bndl_enable = true;
2642
2643 if ((target->tgt_cred_sz % target->block_sz) != 0) {
2644 ath6kl_warn("credit size: %d is not block aligned! Disabling send bundling\n",
2645 target->tgt_cred_sz);
2646
2647 /*
2648 * Disallow send bundling since the credit size is
2649 * not aligned to a block size the I/O block
2650 * padding will spill into the next credit buffer
2651 * which is fatal.
2652 */
2653 target->tx_bndl_mask = 0;
2654 }
2655 }
2656
2657 static int ath6kl_htc_mbox_wait_target(struct htc_target *target)
2658 {
2659 struct htc_packet *packet = NULL;
2660 struct htc_ready_ext_msg *rdy_msg;
2661 struct htc_service_connect_req connect;
2662 struct htc_service_connect_resp resp;
2663 int status;
2664
2665 /* we should be getting 1 control message that the target is ready */
2666 packet = htc_wait_for_ctrl_msg(target);
2667
2668 if (!packet)
2669 return -ENOMEM;
2670
2671 /* we controlled the buffer creation so it's properly aligned */
2672 rdy_msg = (struct htc_ready_ext_msg *)packet->buf;
2673
2674 if ((le16_to_cpu(rdy_msg->ver2_0_info.msg_id) != HTC_MSG_READY_ID) ||
2675 (packet->act_len < sizeof(struct htc_ready_msg))) {
2676 status = -ENOMEM;
2677 goto fail_wait_target;
2678 }
2679
2680 if (!rdy_msg->ver2_0_info.cred_cnt || !rdy_msg->ver2_0_info.cred_sz) {
2681 status = -ENOMEM;
2682 goto fail_wait_target;
2683 }
2684
2685 target->tgt_creds = le16_to_cpu(rdy_msg->ver2_0_info.cred_cnt);
2686 target->tgt_cred_sz = le16_to_cpu(rdy_msg->ver2_0_info.cred_sz);
2687
2688 ath6kl_dbg(ATH6KL_DBG_BOOT,
2689 "htc target ready credits %d size %d\n",
2690 target->tgt_creds, target->tgt_cred_sz);
2691
2692 /* check if this is an extended ready message */
2693 if (packet->act_len >= sizeof(struct htc_ready_ext_msg)) {
2694 /* this is an extended message */
2695 target->htc_tgt_ver = rdy_msg->htc_ver;
2696 target->msg_per_bndl_max = rdy_msg->msg_per_htc_bndl;
2697 } else {
2698 /* legacy */
2699 target->htc_tgt_ver = HTC_VERSION_2P0;
2700 target->msg_per_bndl_max = 0;
2701 }
2702
2703 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc using protocol %s (%d)\n",
2704 (target->htc_tgt_ver == HTC_VERSION_2P0) ? "2.0" : ">= 2.1",
2705 target->htc_tgt_ver);
2706
2707 if (target->msg_per_bndl_max > 0)
2708 htc_setup_msg_bndl(target);
2709
2710 /* setup our pseudo HTC control endpoint connection */
2711 memset(&connect, 0, sizeof(connect));
2712 memset(&resp, 0, sizeof(resp));
2713 connect.ep_cb.rx = htc_ctrl_rx;
2714 connect.ep_cb.rx_refill = NULL;
2715 connect.ep_cb.tx_full = NULL;
2716 connect.max_txq_depth = NUM_CONTROL_BUFFERS;
2717 connect.svc_id = HTC_CTRL_RSVD_SVC;
2718
2719 /* connect fake service */
2720 status = ath6kl_htc_mbox_conn_service((void *)target, &connect, &resp);
2721
2722 if (status)
2723 /*
2724 * FIXME: this call doesn't make sense, the caller should
2725 * call ath6kl_htc_mbox_cleanup() when it wants remove htc
2726 */
2727 ath6kl_hif_cleanup_scatter(target->dev->ar);
2728
2729 fail_wait_target:
2730 if (packet) {
2731 htc_rxpkt_reset(packet);
2732 reclaim_rx_ctrl_buf(target, packet);
2733 }
2734
2735 return status;
2736 }
2737
2738 /*
2739 * Start HTC, enable interrupts and let the target know
2740 * host has finished setup.
2741 */
2742 static int ath6kl_htc_mbox_start(struct htc_target *target)
2743 {
2744 struct htc_packet *packet;
2745 int status;
2746
2747 memset(&target->dev->irq_proc_reg, 0,
2748 sizeof(target->dev->irq_proc_reg));
2749
2750 /* Disable interrupts at the chip level */
2751 ath6kl_hif_disable_intrs(target->dev);
2752
2753 target->htc_flags = 0;
2754 target->rx_st_flags = 0;
2755
2756 /* Push control receive buffers into htc control endpoint */
2757 while ((packet = htc_get_control_buf(target, false)) != NULL) {
2758 status = htc_add_rxbuf(target, packet);
2759 if (status)
2760 return status;
2761 }
2762
2763 /* NOTE: the first entry in the distribution list is ENDPOINT_0 */
2764 ath6kl_credit_init(target->credit_info, &target->cred_dist_list,
2765 target->tgt_creds);
2766
2767 dump_cred_dist_stats(target);
2768
2769 /* Indicate to the target of the setup completion */
2770 status = htc_setup_tx_complete(target);
2771
2772 if (status)
2773 return status;
2774
2775 /* unmask interrupts */
2776 status = ath6kl_hif_unmask_intrs(target->dev);
2777
2778 if (status)
2779 ath6kl_htc_mbox_stop(target);
2780
2781 return status;
2782 }
2783
2784 static int ath6kl_htc_reset(struct htc_target *target)
2785 {
2786 u32 block_size, ctrl_bufsz;
2787 struct htc_packet *packet;
2788 int i;
2789
2790 reset_ep_state(target);
2791
2792 block_size = target->dev->ar->mbox_info.block_size;
2793
2794 ctrl_bufsz = (block_size > HTC_MAX_CTRL_MSG_LEN) ?
2795 (block_size + HTC_HDR_LENGTH) :
2796 (HTC_MAX_CTRL_MSG_LEN + HTC_HDR_LENGTH);
2797
2798 for (i = 0; i < NUM_CONTROL_BUFFERS; i++) {
2799 packet = kzalloc(sizeof(*packet), GFP_KERNEL);
2800 if (!packet)
2801 return -ENOMEM;
2802
2803 packet->buf_start = kzalloc(ctrl_bufsz, GFP_KERNEL);
2804 if (!packet->buf_start) {
2805 kfree(packet);
2806 return -ENOMEM;
2807 }
2808
2809 packet->buf_len = ctrl_bufsz;
2810 if (i < NUM_CONTROL_RX_BUFFERS) {
2811 packet->act_len = 0;
2812 packet->buf = packet->buf_start;
2813 packet->endpoint = ENDPOINT_0;
2814 list_add_tail(&packet->list, &target->free_ctrl_rxbuf);
2815 } else {
2816 list_add_tail(&packet->list, &target->free_ctrl_txbuf);
2817 }
2818 }
2819
2820 return 0;
2821 }
2822
2823 /* htc_stop: stop interrupt reception, and flush all queued buffers */
2824 static void ath6kl_htc_mbox_stop(struct htc_target *target)
2825 {
2826 spin_lock_bh(&target->htc_lock);
2827 target->htc_flags |= HTC_OP_STATE_STOPPING;
2828 spin_unlock_bh(&target->htc_lock);
2829
2830 /*
2831 * Masking interrupts is a synchronous operation, when this
2832 * function returns all pending HIF I/O has completed, we can
2833 * safely flush the queues.
2834 */
2835 ath6kl_hif_mask_intrs(target->dev);
2836
2837 ath6kl_htc_flush_txep_all(target);
2838
2839 ath6kl_htc_mbox_flush_rx_buf(target);
2840
2841 ath6kl_htc_reset(target);
2842 }
2843
2844 static void *ath6kl_htc_mbox_create(struct ath6kl *ar)
2845 {
2846 struct htc_target *target = NULL;
2847 int status = 0;
2848
2849 target = kzalloc(sizeof(*target), GFP_KERNEL);
2850 if (!target) {
2851 ath6kl_err("unable to allocate memory\n");
2852 return NULL;
2853 }
2854
2855 target->dev = kzalloc(sizeof(*target->dev), GFP_KERNEL);
2856 if (!target->dev) {
2857 ath6kl_err("unable to allocate memory\n");
2858 status = -ENOMEM;
2859 goto err_htc_cleanup;
2860 }
2861
2862 spin_lock_init(&target->htc_lock);
2863 spin_lock_init(&target->rx_lock);
2864 spin_lock_init(&target->tx_lock);
2865
2866 INIT_LIST_HEAD(&target->free_ctrl_txbuf);
2867 INIT_LIST_HEAD(&target->free_ctrl_rxbuf);
2868 INIT_LIST_HEAD(&target->cred_dist_list);
2869
2870 target->dev->ar = ar;
2871 target->dev->htc_cnxt = target;
2872 target->ep_waiting = ENDPOINT_MAX;
2873
2874 status = ath6kl_hif_setup(target->dev);
2875 if (status)
2876 goto err_htc_cleanup;
2877
2878 status = ath6kl_htc_reset(target);
2879 if (status)
2880 goto err_htc_cleanup;
2881
2882 return target;
2883
2884 err_htc_cleanup:
2885 ath6kl_htc_mbox_cleanup(target);
2886
2887 return NULL;
2888 }
2889
2890 /* cleanup the HTC instance */
2891 static void ath6kl_htc_mbox_cleanup(struct htc_target *target)
2892 {
2893 struct htc_packet *packet, *tmp_packet;
2894
2895 ath6kl_hif_cleanup_scatter(target->dev->ar);
2896
2897 list_for_each_entry_safe(packet, tmp_packet,
2898 &target->free_ctrl_txbuf, list) {
2899 list_del(&packet->list);
2900 kfree(packet->buf_start);
2901 kfree(packet);
2902 }
2903
2904 list_for_each_entry_safe(packet, tmp_packet,
2905 &target->free_ctrl_rxbuf, list) {
2906 list_del(&packet->list);
2907 kfree(packet->buf_start);
2908 kfree(packet);
2909 }
2910
2911 kfree(target->dev);
2912 kfree(target);
2913 }
2914
2915 static const struct ath6kl_htc_ops ath6kl_htc_mbox_ops = {
2916 .create = ath6kl_htc_mbox_create,
2917 .wait_target = ath6kl_htc_mbox_wait_target,
2918 .start = ath6kl_htc_mbox_start,
2919 .conn_service = ath6kl_htc_mbox_conn_service,
2920 .tx = ath6kl_htc_mbox_tx,
2921 .stop = ath6kl_htc_mbox_stop,
2922 .cleanup = ath6kl_htc_mbox_cleanup,
2923 .flush_txep = ath6kl_htc_mbox_flush_txep,
2924 .flush_rx_buf = ath6kl_htc_mbox_flush_rx_buf,
2925 .activity_changed = ath6kl_htc_mbox_activity_changed,
2926 .get_rxbuf_num = ath6kl_htc_mbox_get_rxbuf_num,
2927 .add_rxbuf_multiple = ath6kl_htc_mbox_add_rxbuf_multiple,
2928 .credit_setup = ath6kl_htc_mbox_credit_setup,
2929 };
2930
2931 void ath6kl_htc_mbox_attach(struct ath6kl *ar)
2932 {
2933 ar->htc_ops = &ath6kl_htc_mbox_ops;
2934 }
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