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path: root/drivers/net/wireless/wl12xx/tx.c
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Diffstat (limited to 'drivers/net/wireless/wl12xx/tx.c')
-rw-r--r--drivers/net/wireless/wl12xx/tx.c885
1 files changed, 885 insertions, 0 deletions
diff --git a/drivers/net/wireless/wl12xx/tx.c b/drivers/net/wireless/wl12xx/tx.c
new file mode 100644
index 000000000000..ca3ab1c1acef
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/tx.c
@@ -0,0 +1,885 @@
1/*
2 * This file is part of wl1271
3 *
4 * Copyright (C) 2009 Nokia Corporation
5 *
6 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 *
22 */
23
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/etherdevice.h>
27
28#include "wl12xx.h"
29#include "io.h"
30#include "reg.h"
31#include "ps.h"
32#include "tx.h"
33
34static int wl1271_set_default_wep_key(struct wl1271 *wl, u8 id)
35{
36 int ret;
37 bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
38
39 if (is_ap)
40 ret = wl1271_cmd_set_ap_default_wep_key(wl, id);
41 else
42 ret = wl1271_cmd_set_sta_default_wep_key(wl, id);
43
44 if (ret < 0)
45 return ret;
46
47 wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
48 return 0;
49}
50
51static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
52{
53 int id;
54
55 id = find_first_zero_bit(wl->tx_frames_map, ACX_TX_DESCRIPTORS);
56 if (id >= ACX_TX_DESCRIPTORS)
57 return -EBUSY;
58
59 __set_bit(id, wl->tx_frames_map);
60 wl->tx_frames[id] = skb;
61 wl->tx_frames_cnt++;
62 return id;
63}
64
65static void wl1271_free_tx_id(struct wl1271 *wl, int id)
66{
67 if (__test_and_clear_bit(id, wl->tx_frames_map)) {
68 if (unlikely(wl->tx_frames_cnt == ACX_TX_DESCRIPTORS))
69 clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
70
71 wl->tx_frames[id] = NULL;
72 wl->tx_frames_cnt--;
73 }
74}
75
76static int wl1271_tx_update_filters(struct wl1271 *wl,
77 struct sk_buff *skb)
78{
79 struct ieee80211_hdr *hdr;
80
81 hdr = (struct ieee80211_hdr *)(skb->data +
82 sizeof(struct wl1271_tx_hw_descr));
83
84 /*
85 * stop bssid-based filtering before transmitting authentication
86 * requests. this way the hw will never drop authentication
87 * responses coming from BSSIDs it isn't familiar with (e.g. on
88 * roaming)
89 */
90 if (!ieee80211_is_auth(hdr->frame_control))
91 return 0;
92
93 wl1271_configure_filters(wl, FIF_OTHER_BSS);
94
95 return wl1271_acx_rx_config(wl, wl->rx_config, wl->rx_filter);
96}
97
98static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
99 struct sk_buff *skb)
100{
101 struct ieee80211_hdr *hdr;
102
103 /*
104 * add the station to the known list before transmitting the
105 * authentication response. this way it won't get de-authed by FW
106 * when transmitting too soon.
107 */
108 hdr = (struct ieee80211_hdr *)(skb->data +
109 sizeof(struct wl1271_tx_hw_descr));
110 if (ieee80211_is_auth(hdr->frame_control))
111 wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
112}
113
114static void wl1271_tx_regulate_link(struct wl1271 *wl, u8 hlid)
115{
116 bool fw_ps;
117 u8 tx_blks;
118
119 /* only regulate station links */
120 if (hlid < WL1271_AP_STA_HLID_START)
121 return;
122
123 fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
124 tx_blks = wl->links[hlid].allocated_blks;
125
126 /*
127 * if in FW PS and there is enough data in FW we can put the link
128 * into high-level PS and clean out its TX queues.
129 */
130 if (fw_ps && tx_blks >= WL1271_PS_STA_MAX_BLOCKS)
131 wl1271_ps_link_start(wl, hlid, true);
132}
133
134u8 wl1271_tx_get_hlid(struct sk_buff *skb)
135{
136 struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb);
137
138 if (control->control.sta) {
139 struct wl1271_station *wl_sta;
140
141 wl_sta = (struct wl1271_station *)
142 control->control.sta->drv_priv;
143 return wl_sta->hlid;
144 } else {
145 struct ieee80211_hdr *hdr;
146
147 hdr = (struct ieee80211_hdr *)skb->data;
148 if (ieee80211_is_mgmt(hdr->frame_control))
149 return WL1271_AP_GLOBAL_HLID;
150 else
151 return WL1271_AP_BROADCAST_HLID;
152 }
153}
154
155static unsigned int wl12xx_calc_packet_alignment(struct wl1271 *wl,
156 unsigned int packet_length)
157{
158 if (wl->quirks & WL12XX_QUIRK_BLOCKSIZE_ALIGNMENT)
159 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
160 else
161 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
162}
163
164static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra,
165 u32 buf_offset, u8 hlid)
166{
167 struct wl1271_tx_hw_descr *desc;
168 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
169 u32 len;
170 u32 total_blocks;
171 int id, ret = -EBUSY;
172 u32 spare_blocks;
173
174 if (unlikely(wl->quirks & WL12XX_QUIRK_USE_2_SPARE_BLOCKS))
175 spare_blocks = 2;
176 else
177 spare_blocks = 1;
178
179 if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
180 return -EAGAIN;
181
182 /* allocate free identifier for the packet */
183 id = wl1271_alloc_tx_id(wl, skb);
184 if (id < 0)
185 return id;
186
187 /* approximate the number of blocks required for this packet
188 in the firmware */
189 len = wl12xx_calc_packet_alignment(wl, total_len);
190
191 total_blocks = (len + TX_HW_BLOCK_SIZE - 1) / TX_HW_BLOCK_SIZE +
192 spare_blocks;
193
194 if (total_blocks <= wl->tx_blocks_available) {
195 desc = (struct wl1271_tx_hw_descr *)skb_push(
196 skb, total_len - skb->len);
197
198 /* HW descriptor fields change between wl127x and wl128x */
199 if (wl->chip.id == CHIP_ID_1283_PG20) {
200 desc->wl128x_mem.total_mem_blocks = total_blocks;
201 } else {
202 desc->wl127x_mem.extra_blocks = spare_blocks;
203 desc->wl127x_mem.total_mem_blocks = total_blocks;
204 }
205
206 desc->id = id;
207
208 wl->tx_blocks_available -= total_blocks;
209 wl->tx_allocated_blocks += total_blocks;
210
211 if (wl->bss_type == BSS_TYPE_AP_BSS)
212 wl->links[hlid].allocated_blks += total_blocks;
213
214 ret = 0;
215
216 wl1271_debug(DEBUG_TX,
217 "tx_allocate: size: %d, blocks: %d, id: %d",
218 total_len, total_blocks, id);
219 } else {
220 wl1271_free_tx_id(wl, id);
221 }
222
223 return ret;
224}
225
226static bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
227{
228 return wl->dummy_packet == skb;
229}
230
231static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
232 u32 extra, struct ieee80211_tx_info *control,
233 u8 hlid)
234{
235 struct timespec ts;
236 struct wl1271_tx_hw_descr *desc;
237 int aligned_len, ac, rate_idx;
238 s64 hosttime;
239 u16 tx_attr;
240
241 desc = (struct wl1271_tx_hw_descr *) skb->data;
242
243 /* relocate space for security header */
244 if (extra) {
245 void *framestart = skb->data + sizeof(*desc);
246 u16 fc = *(u16 *)(framestart + extra);
247 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
248 memmove(framestart, framestart + extra, hdrlen);
249 }
250
251 /* configure packet life time */
252 getnstimeofday(&ts);
253 hosttime = (timespec_to_ns(&ts) >> 10);
254 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
255
256 if (wl->bss_type != BSS_TYPE_AP_BSS)
257 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
258 else
259 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
260
261 /* queue */
262 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
263 desc->tid = skb->priority;
264
265 if (wl12xx_is_dummy_packet(wl, skb)) {
266 /*
267 * FW expects the dummy packet to have an invalid session id -
268 * any session id that is different than the one set in the join
269 */
270 tx_attr = ((~wl->session_counter) <<
271 TX_HW_ATTR_OFST_SESSION_COUNTER) &
272 TX_HW_ATTR_SESSION_COUNTER;
273
274 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
275 } else {
276 /* configure the tx attributes */
277 tx_attr =
278 wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
279 }
280
281 if (wl->bss_type != BSS_TYPE_AP_BSS) {
282 desc->aid = hlid;
283
284 /* if the packets are destined for AP (have a STA entry)
285 send them with AP rate policies, otherwise use default
286 basic rates */
287 if (control->control.sta)
288 rate_idx = ACX_TX_AP_FULL_RATE;
289 else
290 rate_idx = ACX_TX_BASIC_RATE;
291 } else {
292 desc->hlid = hlid;
293 switch (hlid) {
294 case WL1271_AP_GLOBAL_HLID:
295 rate_idx = ACX_TX_AP_MODE_MGMT_RATE;
296 break;
297 case WL1271_AP_BROADCAST_HLID:
298 rate_idx = ACX_TX_AP_MODE_BCST_RATE;
299 break;
300 default:
301 rate_idx = ac;
302 break;
303 }
304 }
305
306 tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
307 desc->reserved = 0;
308
309 aligned_len = wl12xx_calc_packet_alignment(wl, skb->len);
310
311 if (wl->chip.id == CHIP_ID_1283_PG20) {
312 desc->wl128x_mem.extra_bytes = aligned_len - skb->len;
313 desc->length = cpu_to_le16(aligned_len >> 2);
314
315 wl1271_debug(DEBUG_TX, "tx_fill_hdr: hlid: %d "
316 "tx_attr: 0x%x len: %d life: %d mem: %d",
317 desc->hlid, tx_attr,
318 le16_to_cpu(desc->length),
319 le16_to_cpu(desc->life_time),
320 desc->wl128x_mem.total_mem_blocks);
321 } else {
322 int pad;
323
324 /* Store the aligned length in terms of words */
325 desc->length = cpu_to_le16(aligned_len >> 2);
326
327 /* calculate number of padding bytes */
328 pad = aligned_len - skb->len;
329 tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
330
331 wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d hlid: %d "
332 "tx_attr: 0x%x len: %d life: %d mem: %d", pad,
333 desc->hlid, tx_attr,
334 le16_to_cpu(desc->length),
335 le16_to_cpu(desc->life_time),
336 desc->wl127x_mem.total_mem_blocks);
337 }
338
339 desc->tx_attr = cpu_to_le16(tx_attr);
340}
341
342/* caller must hold wl->mutex */
343static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb,
344 u32 buf_offset)
345{
346 struct ieee80211_tx_info *info;
347 u32 extra = 0;
348 int ret = 0;
349 u32 total_len;
350 u8 hlid;
351
352 if (!skb)
353 return -EINVAL;
354
355 info = IEEE80211_SKB_CB(skb);
356
357 if (info->control.hw_key &&
358 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
359 extra = WL1271_TKIP_IV_SPACE;
360
361 if (info->control.hw_key) {
362 bool is_wep;
363 u8 idx = info->control.hw_key->hw_key_idx;
364 u32 cipher = info->control.hw_key->cipher;
365
366 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
367 (cipher == WLAN_CIPHER_SUITE_WEP104);
368
369 if (unlikely(is_wep && wl->default_key != idx)) {
370 ret = wl1271_set_default_wep_key(wl, idx);
371 if (ret < 0)
372 return ret;
373 wl->default_key = idx;
374 }
375 }
376
377 if (wl->bss_type == BSS_TYPE_AP_BSS)
378 hlid = wl1271_tx_get_hlid(skb);
379 else
380 hlid = TX_HW_DEFAULT_AID;
381
382 ret = wl1271_tx_allocate(wl, skb, extra, buf_offset, hlid);
383 if (ret < 0)
384 return ret;
385
386 if (wl->bss_type == BSS_TYPE_AP_BSS) {
387 wl1271_tx_ap_update_inconnection_sta(wl, skb);
388 wl1271_tx_regulate_link(wl, hlid);
389 } else {
390 wl1271_tx_update_filters(wl, skb);
391 }
392
393 wl1271_tx_fill_hdr(wl, skb, extra, info, hlid);
394
395 /*
396 * The length of each packet is stored in terms of
397 * words. Thus, we must pad the skb data to make sure its
398 * length is aligned. The number of padding bytes is computed
399 * and set in wl1271_tx_fill_hdr.
400 * In special cases, we want to align to a specific block size
401 * (eg. for wl128x with SDIO we align to 256).
402 */
403 total_len = wl12xx_calc_packet_alignment(wl, skb->len);
404
405 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
406 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
407
408 /* Revert side effects in the dummy packet skb, so it can be reused */
409 if (wl12xx_is_dummy_packet(wl, skb))
410 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
411
412 return total_len;
413}
414
415u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
416{
417 struct ieee80211_supported_band *band;
418 u32 enabled_rates = 0;
419 int bit;
420
421 band = wl->hw->wiphy->bands[wl->band];
422 for (bit = 0; bit < band->n_bitrates; bit++) {
423 if (rate_set & 0x1)
424 enabled_rates |= band->bitrates[bit].hw_value;
425 rate_set >>= 1;
426 }
427
428#ifdef CONFIG_WL12XX_HT
429 /* MCS rates indication are on bits 16 - 23 */
430 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
431
432 for (bit = 0; bit < 8; bit++) {
433 if (rate_set & 0x1)
434 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
435 rate_set >>= 1;
436 }
437#endif
438
439 return enabled_rates;
440}
441
442void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
443{
444 unsigned long flags;
445
446 if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
447 wl->tx_queue_count <= WL1271_TX_QUEUE_LOW_WATERMARK) {
448 /* firmware buffer has space, restart queues */
449 spin_lock_irqsave(&wl->wl_lock, flags);
450 ieee80211_wake_queues(wl->hw);
451 clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
452 spin_unlock_irqrestore(&wl->wl_lock, flags);
453 }
454}
455
456static struct sk_buff *wl1271_sta_skb_dequeue(struct wl1271 *wl)
457{
458 struct sk_buff *skb = NULL;
459 unsigned long flags;
460
461 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VO]);
462 if (skb)
463 goto out;
464 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VI]);
465 if (skb)
466 goto out;
467 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BE]);
468 if (skb)
469 goto out;
470 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BK]);
471
472out:
473 if (skb) {
474 spin_lock_irqsave(&wl->wl_lock, flags);
475 wl->tx_queue_count--;
476 spin_unlock_irqrestore(&wl->wl_lock, flags);
477 }
478
479 return skb;
480}
481
482static struct sk_buff *wl1271_ap_skb_dequeue(struct wl1271 *wl)
483{
484 struct sk_buff *skb = NULL;
485 unsigned long flags;
486 int i, h, start_hlid;
487
488 /* start from the link after the last one */
489 start_hlid = (wl->last_tx_hlid + 1) % AP_MAX_LINKS;
490
491 /* dequeue according to AC, round robin on each link */
492 for (i = 0; i < AP_MAX_LINKS; i++) {
493 h = (start_hlid + i) % AP_MAX_LINKS;
494
495 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VO]);
496 if (skb)
497 goto out;
498 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VI]);
499 if (skb)
500 goto out;
501 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BE]);
502 if (skb)
503 goto out;
504 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BK]);
505 if (skb)
506 goto out;
507 }
508
509out:
510 if (skb) {
511 wl->last_tx_hlid = h;
512 spin_lock_irqsave(&wl->wl_lock, flags);
513 wl->tx_queue_count--;
514 spin_unlock_irqrestore(&wl->wl_lock, flags);
515 } else {
516 wl->last_tx_hlid = 0;
517 }
518
519 return skb;
520}
521
522static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
523{
524 unsigned long flags;
525 struct sk_buff *skb = NULL;
526
527 if (wl->bss_type == BSS_TYPE_AP_BSS)
528 skb = wl1271_ap_skb_dequeue(wl);
529 else
530 skb = wl1271_sta_skb_dequeue(wl);
531
532 if (!skb &&
533 test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
534 skb = wl->dummy_packet;
535 spin_lock_irqsave(&wl->wl_lock, flags);
536 wl->tx_queue_count--;
537 spin_unlock_irqrestore(&wl->wl_lock, flags);
538 }
539
540 return skb;
541}
542
543static void wl1271_skb_queue_head(struct wl1271 *wl, struct sk_buff *skb)
544{
545 unsigned long flags;
546 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
547
548 if (wl12xx_is_dummy_packet(wl, skb)) {
549 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
550 } else if (wl->bss_type == BSS_TYPE_AP_BSS) {
551 u8 hlid = wl1271_tx_get_hlid(skb);
552 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
553
554 /* make sure we dequeue the same packet next time */
555 wl->last_tx_hlid = (hlid + AP_MAX_LINKS - 1) % AP_MAX_LINKS;
556 } else {
557 skb_queue_head(&wl->tx_queue[q], skb);
558 }
559
560 spin_lock_irqsave(&wl->wl_lock, flags);
561 wl->tx_queue_count++;
562 spin_unlock_irqrestore(&wl->wl_lock, flags);
563}
564
565void wl1271_tx_work_locked(struct wl1271 *wl)
566{
567 struct sk_buff *skb;
568 u32 buf_offset = 0;
569 bool sent_packets = false;
570 int ret;
571
572 if (unlikely(wl->state == WL1271_STATE_OFF))
573 return;
574
575 while ((skb = wl1271_skb_dequeue(wl))) {
576 ret = wl1271_prepare_tx_frame(wl, skb, buf_offset);
577 if (ret == -EAGAIN) {
578 /*
579 * Aggregation buffer is full.
580 * Flush buffer and try again.
581 */
582 wl1271_skb_queue_head(wl, skb);
583 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
584 buf_offset, true);
585 sent_packets = true;
586 buf_offset = 0;
587 continue;
588 } else if (ret == -EBUSY) {
589 /*
590 * Firmware buffer is full.
591 * Queue back last skb, and stop aggregating.
592 */
593 wl1271_skb_queue_head(wl, skb);
594 /* No work left, avoid scheduling redundant tx work */
595 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
596 goto out_ack;
597 } else if (ret < 0) {
598 dev_kfree_skb(skb);
599 goto out_ack;
600 }
601 buf_offset += ret;
602 wl->tx_packets_count++;
603 }
604
605out_ack:
606 if (buf_offset) {
607 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
608 buf_offset, true);
609 sent_packets = true;
610 }
611 if (sent_packets) {
612 /*
613 * Interrupt the firmware with the new packets. This is only
614 * required for older hardware revisions
615 */
616 if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
617 wl1271_write32(wl, WL1271_HOST_WR_ACCESS,
618 wl->tx_packets_count);
619
620 wl1271_handle_tx_low_watermark(wl);
621 }
622}
623
624void wl1271_tx_work(struct work_struct *work)
625{
626 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
627 int ret;
628
629 mutex_lock(&wl->mutex);
630 ret = wl1271_ps_elp_wakeup(wl);
631 if (ret < 0)
632 goto out;
633
634 wl1271_tx_work_locked(wl);
635
636 wl1271_ps_elp_sleep(wl);
637out:
638 mutex_unlock(&wl->mutex);
639}
640
641static void wl1271_tx_complete_packet(struct wl1271 *wl,
642 struct wl1271_tx_hw_res_descr *result)
643{
644 struct ieee80211_tx_info *info;
645 struct sk_buff *skb;
646 int id = result->id;
647 int rate = -1;
648 u8 retries = 0;
649
650 /* check for id legality */
651 if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
652 wl1271_warning("TX result illegal id: %d", id);
653 return;
654 }
655
656 skb = wl->tx_frames[id];
657 info = IEEE80211_SKB_CB(skb);
658
659 if (wl12xx_is_dummy_packet(wl, skb)) {
660 wl1271_free_tx_id(wl, id);
661 return;
662 }
663
664 /* update the TX status info */
665 if (result->status == TX_SUCCESS) {
666 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
667 info->flags |= IEEE80211_TX_STAT_ACK;
668 rate = wl1271_rate_to_idx(result->rate_class_index, wl->band);
669 retries = result->ack_failures;
670 } else if (result->status == TX_RETRY_EXCEEDED) {
671 wl->stats.excessive_retries++;
672 retries = result->ack_failures;
673 }
674
675 info->status.rates[0].idx = rate;
676 info->status.rates[0].count = retries;
677 info->status.rates[0].flags = 0;
678 info->status.ack_signal = -1;
679
680 wl->stats.retry_count += result->ack_failures;
681
682 /* update security sequence number */
683 wl->tx_security_seq += (result->lsb_security_sequence_number -
684 wl->tx_security_last_seq);
685 wl->tx_security_last_seq = result->lsb_security_sequence_number;
686
687 /* remove private header from packet */
688 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
689
690 /* remove TKIP header space if present */
691 if (info->control.hw_key &&
692 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
693 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
694 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
695 skb_pull(skb, WL1271_TKIP_IV_SPACE);
696 }
697
698 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
699 " status 0x%x",
700 result->id, skb, result->ack_failures,
701 result->rate_class_index, result->status);
702
703 /* return the packet to the stack */
704 skb_queue_tail(&wl->deferred_tx_queue, skb);
705 ieee80211_queue_work(wl->hw, &wl->netstack_work);
706 wl1271_free_tx_id(wl, result->id);
707}
708
709/* Called upon reception of a TX complete interrupt */
710void wl1271_tx_complete(struct wl1271 *wl)
711{
712 struct wl1271_acx_mem_map *memmap =
713 (struct wl1271_acx_mem_map *)wl->target_mem_map;
714 u32 count, fw_counter;
715 u32 i;
716
717 /* read the tx results from the chipset */
718 wl1271_read(wl, le32_to_cpu(memmap->tx_result),
719 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
720 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
721
722 /* write host counter to chipset (to ack) */
723 wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
724 offsetof(struct wl1271_tx_hw_res_if,
725 tx_result_host_counter), fw_counter);
726
727 count = fw_counter - wl->tx_results_count;
728 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
729
730 /* verify that the result buffer is not getting overrun */
731 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
732 wl1271_warning("TX result overflow from chipset: %d", count);
733
734 /* process the results */
735 for (i = 0; i < count; i++) {
736 struct wl1271_tx_hw_res_descr *result;
737 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
738
739 /* process the packet */
740 result = &(wl->tx_res_if->tx_results_queue[offset]);
741 wl1271_tx_complete_packet(wl, result);
742
743 wl->tx_results_count++;
744 }
745}
746
747void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
748{
749 struct sk_buff *skb;
750 int i, total = 0;
751 unsigned long flags;
752 struct ieee80211_tx_info *info;
753
754 for (i = 0; i < NUM_TX_QUEUES; i++) {
755 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
756 wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
757 info = IEEE80211_SKB_CB(skb);
758 info->status.rates[0].idx = -1;
759 info->status.rates[0].count = 0;
760 ieee80211_tx_status(wl->hw, skb);
761 total++;
762 }
763 }
764
765 spin_lock_irqsave(&wl->wl_lock, flags);
766 wl->tx_queue_count -= total;
767 spin_unlock_irqrestore(&wl->wl_lock, flags);
768
769 wl1271_handle_tx_low_watermark(wl);
770}
771
772/* caller must hold wl->mutex and TX must be stopped */
773void wl1271_tx_reset(struct wl1271 *wl, bool reset_tx_queues)
774{
775 int i;
776 struct sk_buff *skb;
777 struct ieee80211_tx_info *info;
778
779 /* TX failure */
780 if (wl->bss_type == BSS_TYPE_AP_BSS) {
781 for (i = 0; i < AP_MAX_LINKS; i++) {
782 wl1271_tx_reset_link_queues(wl, i);
783 wl->links[i].allocated_blks = 0;
784 wl->links[i].prev_freed_blks = 0;
785 }
786
787 wl->last_tx_hlid = 0;
788 } else {
789 for (i = 0; i < NUM_TX_QUEUES; i++) {
790 while ((skb = skb_dequeue(&wl->tx_queue[i]))) {
791 wl1271_debug(DEBUG_TX, "freeing skb 0x%p",
792 skb);
793
794 if (!wl12xx_is_dummy_packet(wl, skb)) {
795 info = IEEE80211_SKB_CB(skb);
796 info->status.rates[0].idx = -1;
797 info->status.rates[0].count = 0;
798 ieee80211_tx_status(wl->hw, skb);
799 }
800 }
801 }
802 }
803
804 wl->tx_queue_count = 0;
805
806 /*
807 * Make sure the driver is at a consistent state, in case this
808 * function is called from a context other than interface removal.
809 * This call will always wake the TX queues.
810 */
811 if (reset_tx_queues)
812 wl1271_handle_tx_low_watermark(wl);
813
814 for (i = 0; i < ACX_TX_DESCRIPTORS; i++) {
815 if (wl->tx_frames[i] == NULL)
816 continue;
817
818 skb = wl->tx_frames[i];
819 wl1271_free_tx_id(wl, i);
820 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
821
822 if (!wl12xx_is_dummy_packet(wl, skb)) {
823 /*
824 * Remove private headers before passing the skb to
825 * mac80211
826 */
827 info = IEEE80211_SKB_CB(skb);
828 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
829 if (info->control.hw_key &&
830 info->control.hw_key->cipher ==
831 WLAN_CIPHER_SUITE_TKIP) {
832 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
833 memmove(skb->data + WL1271_TKIP_IV_SPACE,
834 skb->data, hdrlen);
835 skb_pull(skb, WL1271_TKIP_IV_SPACE);
836 }
837
838 info->status.rates[0].idx = -1;
839 info->status.rates[0].count = 0;
840
841 ieee80211_tx_status(wl->hw, skb);
842 }
843 }
844}
845
846#define WL1271_TX_FLUSH_TIMEOUT 500000
847
848/* caller must *NOT* hold wl->mutex */
849void wl1271_tx_flush(struct wl1271 *wl)
850{
851 unsigned long timeout;
852 timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
853
854 while (!time_after(jiffies, timeout)) {
855 mutex_lock(&wl->mutex);
856 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
857 wl->tx_frames_cnt, wl->tx_queue_count);
858 if ((wl->tx_frames_cnt == 0) && (wl->tx_queue_count == 0)) {
859 mutex_unlock(&wl->mutex);
860 return;
861 }
862 mutex_unlock(&wl->mutex);
863 msleep(1);
864 }
865
866 wl1271_warning("Unable to flush all TX buffers, timed out.");
867}
868
869u32 wl1271_tx_min_rate_get(struct wl1271 *wl)
870{
871 int i;
872 u32 rate = 0;
873
874 if (!wl->basic_rate_set) {
875 WARN_ON(1);
876 wl->basic_rate_set = wl->conf.tx.basic_rate;
877 }
878
879 for (i = 0; !rate; i++) {
880 if ((wl->basic_rate_set >> i) & 0x1)
881 rate = 1 << i;
882 }
883
884 return rate;
885}
generated by cgit v1.2.2 (git 2.25.0) at 2025-04-08 10:19:12 -0400