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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, ac;
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
210 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
211 wl->tx_allocated_blocks[ac] += total_blocks;
212
213 if (wl->bss_type == BSS_TYPE_AP_BSS)
214 wl->links[hlid].allocated_blks += total_blocks;
215
216 ret = 0;
217
218 wl1271_debug(DEBUG_TX,
219 "tx_allocate: size: %d, blocks: %d, id: %d",
220 total_len, total_blocks, id);
221 } else {
222 wl1271_free_tx_id(wl, id);
223 }
224
225 return ret;
226}
227
228static bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
229{
230 return wl->dummy_packet == skb;
231}
232
233static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
234 u32 extra, struct ieee80211_tx_info *control,
235 u8 hlid)
236{
237 struct timespec ts;
238 struct wl1271_tx_hw_descr *desc;
239 int aligned_len, ac, rate_idx;
240 s64 hosttime;
241 u16 tx_attr;
242
243 desc = (struct wl1271_tx_hw_descr *) skb->data;
244
245 /* relocate space for security header */
246 if (extra) {
247 void *framestart = skb->data + sizeof(*desc);
248 u16 fc = *(u16 *)(framestart + extra);
249 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
250 memmove(framestart, framestart + extra, hdrlen);
251 }
252
253 /* configure packet life time */
254 getnstimeofday(&ts);
255 hosttime = (timespec_to_ns(&ts) >> 10);
256 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
257
258 if (wl->bss_type != BSS_TYPE_AP_BSS)
259 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
260 else
261 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
262
263 /* queue */
264 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
265 desc->tid = skb->priority;
266
267 if (wl12xx_is_dummy_packet(wl, skb)) {
268 /*
269 * FW expects the dummy packet to have an invalid session id -
270 * any session id that is different than the one set in the join
271 */
272 tx_attr = ((~wl->session_counter) <<
273 TX_HW_ATTR_OFST_SESSION_COUNTER) &
274 TX_HW_ATTR_SESSION_COUNTER;
275
276 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
277 } else {
278 /* configure the tx attributes */
279 tx_attr =
280 wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
281 }
282
283 if (wl->bss_type != BSS_TYPE_AP_BSS) {
284 desc->aid = hlid;
285
286 /* if the packets are destined for AP (have a STA entry)
287 send them with AP rate policies, otherwise use default
288 basic rates */
289 if (control->control.sta)
290 rate_idx = ACX_TX_AP_FULL_RATE;
291 else
292 rate_idx = ACX_TX_BASIC_RATE;
293 } else {
294 desc->hlid = hlid;
295 switch (hlid) {
296 case WL1271_AP_GLOBAL_HLID:
297 rate_idx = ACX_TX_AP_MODE_MGMT_RATE;
298 break;
299 case WL1271_AP_BROADCAST_HLID:
300 rate_idx = ACX_TX_AP_MODE_BCST_RATE;
301 break;
302 default:
303 rate_idx = ac;
304 break;
305 }
306 }
307
308 tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
309 desc->reserved = 0;
310
311 aligned_len = wl12xx_calc_packet_alignment(wl, skb->len);
312
313 if (wl->chip.id == CHIP_ID_1283_PG20) {
314 desc->wl128x_mem.extra_bytes = aligned_len - skb->len;
315 desc->length = cpu_to_le16(aligned_len >> 2);
316
317 wl1271_debug(DEBUG_TX, "tx_fill_hdr: hlid: %d "
318 "tx_attr: 0x%x len: %d life: %d mem: %d",
319 desc->hlid, tx_attr,
320 le16_to_cpu(desc->length),
321 le16_to_cpu(desc->life_time),
322 desc->wl128x_mem.total_mem_blocks);
323 } else {
324 int pad;
325
326 /* Store the aligned length in terms of words */
327 desc->length = cpu_to_le16(aligned_len >> 2);
328
329 /* calculate number of padding bytes */
330 pad = aligned_len - skb->len;
331 tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
332
333 wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d hlid: %d "
334 "tx_attr: 0x%x len: %d life: %d mem: %d", pad,
335 desc->hlid, tx_attr,
336 le16_to_cpu(desc->length),
337 le16_to_cpu(desc->life_time),
338 desc->wl127x_mem.total_mem_blocks);
339 }
340
341 desc->tx_attr = cpu_to_le16(tx_attr);
342}
343
344/* caller must hold wl->mutex */
345static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb,
346 u32 buf_offset)
347{
348 struct ieee80211_tx_info *info;
349 u32 extra = 0;
350 int ret = 0;
351 u32 total_len;
352 u8 hlid;
353
354 if (!skb)
355 return -EINVAL;
356
357 info = IEEE80211_SKB_CB(skb);
358
359 if (info->control.hw_key &&
360 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
361 extra = WL1271_TKIP_IV_SPACE;
362
363 if (info->control.hw_key) {
364 bool is_wep;
365 u8 idx = info->control.hw_key->hw_key_idx;
366 u32 cipher = info->control.hw_key->cipher;
367
368 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
369 (cipher == WLAN_CIPHER_SUITE_WEP104);
370
371 if (unlikely(is_wep && wl->default_key != idx)) {
372 ret = wl1271_set_default_wep_key(wl, idx);
373 if (ret < 0)
374 return ret;
375 wl->default_key = idx;
376 }
377 }
378
379 if (wl->bss_type == BSS_TYPE_AP_BSS)
380 hlid = wl1271_tx_get_hlid(skb);
381 else
382 hlid = TX_HW_DEFAULT_AID;
383
384 ret = wl1271_tx_allocate(wl, skb, extra, buf_offset, hlid);
385 if (ret < 0)
386 return ret;
387
388 wl1271_tx_fill_hdr(wl, skb, extra, info, hlid);
389
390 if (wl->bss_type == BSS_TYPE_AP_BSS) {
391 wl1271_tx_ap_update_inconnection_sta(wl, skb);
392 wl1271_tx_regulate_link(wl, hlid);
393 } else {
394 wl1271_tx_update_filters(wl, skb);
395 }
396
397 /*
398 * The length of each packet is stored in terms of
399 * words. Thus, we must pad the skb data to make sure its
400 * length is aligned. The number of padding bytes is computed
401 * and set in wl1271_tx_fill_hdr.
402 * In special cases, we want to align to a specific block size
403 * (eg. for wl128x with SDIO we align to 256).
404 */
405 total_len = wl12xx_calc_packet_alignment(wl, skb->len);
406
407 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
408 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
409
410 /* Revert side effects in the dummy packet skb, so it can be reused */
411 if (wl12xx_is_dummy_packet(wl, skb))
412 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
413
414 return total_len;
415}
416
417u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
418{
419 struct ieee80211_supported_band *band;
420 u32 enabled_rates = 0;
421 int bit;
422
423 band = wl->hw->wiphy->bands[wl->band];
424 for (bit = 0; bit < band->n_bitrates; bit++) {
425 if (rate_set & 0x1)
426 enabled_rates |= band->bitrates[bit].hw_value;
427 rate_set >>= 1;
428 }
429
430#ifdef CONFIG_WL12XX_HT
431 /* MCS rates indication are on bits 16 - 23 */
432 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
433
434 for (bit = 0; bit < 8; bit++) {
435 if (rate_set & 0x1)
436 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
437 rate_set >>= 1;
438 }
439#endif
440
441 return enabled_rates;
442}
443
444void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
445{
446 unsigned long flags;
447 int i;
448
449 for (i = 0; i < NUM_TX_QUEUES; i++) {
450 if (test_bit(i, &wl->stopped_queues_map) &&
451 wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
452 /* firmware buffer has space, restart queues */
453 spin_lock_irqsave(&wl->wl_lock, flags);
454 ieee80211_wake_queue(wl->hw,
455 wl1271_tx_get_mac80211_queue(i));
456 clear_bit(i, &wl->stopped_queues_map);
457 spin_unlock_irqrestore(&wl->wl_lock, flags);
458 }
459 }
460}
461
462static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl,
463 struct sk_buff_head *queues)
464{
465 int i, q = -1;
466 u32 min_blks = 0xffffffff;
467
468 /*
469 * Find a non-empty ac where:
470 * 1. There are packets to transmit
471 * 2. The FW has the least allocated blocks
472 */
473 for (i = 0; i < NUM_TX_QUEUES; i++)
474 if (!skb_queue_empty(&queues[i]) &&
475 (wl->tx_allocated_blocks[i] < min_blks)) {
476 q = i;
477 min_blks = wl->tx_allocated_blocks[q];
478 }
479
480 if (q == -1)
481 return NULL;
482
483 return &queues[q];
484}
485
486static struct sk_buff *wl1271_sta_skb_dequeue(struct wl1271 *wl)
487{
488 struct sk_buff *skb = NULL;
489 unsigned long flags;
490 struct sk_buff_head *queue;
491
492 queue = wl1271_select_queue(wl, wl->tx_queue);
493 if (!queue)
494 goto out;
495
496 skb = skb_dequeue(queue);
497
498out:
499 if (skb) {
500 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
501 spin_lock_irqsave(&wl->wl_lock, flags);
502 wl->tx_queue_count[q]--;
503 spin_unlock_irqrestore(&wl->wl_lock, flags);
504 }
505
506 return skb;
507}
508
509static struct sk_buff *wl1271_ap_skb_dequeue(struct wl1271 *wl)
510{
511 struct sk_buff *skb = NULL;
512 unsigned long flags;
513 int i, h, start_hlid;
514 struct sk_buff_head *queue;
515
516 /* start from the link after the last one */
517 start_hlid = (wl->last_tx_hlid + 1) % AP_MAX_LINKS;
518
519 /* dequeue according to AC, round robin on each link */
520 for (i = 0; i < AP_MAX_LINKS; i++) {
521 h = (start_hlid + i) % AP_MAX_LINKS;
522
523 /* only consider connected stations */
524 if (h >= WL1271_AP_STA_HLID_START &&
525 !test_bit(h - WL1271_AP_STA_HLID_START, wl->ap_hlid_map))
526 continue;
527
528 queue = wl1271_select_queue(wl, wl->links[h].tx_queue);
529 if (!queue)
530 continue;
531
532 skb = skb_dequeue(queue);
533 if (skb)
534 break;
535 }
536
537 if (skb) {
538 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
539 wl->last_tx_hlid = h;
540 spin_lock_irqsave(&wl->wl_lock, flags);
541 wl->tx_queue_count[q]--;
542 spin_unlock_irqrestore(&wl->wl_lock, flags);
543 } else {
544 wl->last_tx_hlid = 0;
545 }
546
547 return skb;
548}
549
550static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
551{
552 unsigned long flags;
553 struct sk_buff *skb = NULL;
554
555 if (wl->bss_type == BSS_TYPE_AP_BSS)
556 skb = wl1271_ap_skb_dequeue(wl);
557 else
558 skb = wl1271_sta_skb_dequeue(wl);
559
560 if (!skb &&
561 test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
562 int q;
563
564 skb = wl->dummy_packet;
565 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
566 spin_lock_irqsave(&wl->wl_lock, flags);
567 wl->tx_queue_count[q]--;
568 spin_unlock_irqrestore(&wl->wl_lock, flags);
569 }
570
571 return skb;
572}
573
574static void wl1271_skb_queue_head(struct wl1271 *wl, struct sk_buff *skb)
575{
576 unsigned long flags;
577 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
578
579 if (wl12xx_is_dummy_packet(wl, skb)) {
580 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
581 } else if (wl->bss_type == BSS_TYPE_AP_BSS) {
582 u8 hlid = wl1271_tx_get_hlid(skb);
583 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
584
585 /* make sure we dequeue the same packet next time */
586 wl->last_tx_hlid = (hlid + AP_MAX_LINKS - 1) % AP_MAX_LINKS;
587 } else {
588 skb_queue_head(&wl->tx_queue[q], skb);
589 }
590
591 spin_lock_irqsave(&wl->wl_lock, flags);
592 wl->tx_queue_count[q]++;
593 spin_unlock_irqrestore(&wl->wl_lock, flags);
594}
595
596static bool wl1271_tx_is_data_present(struct sk_buff *skb)
597{
598 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
599
600 return ieee80211_is_data_present(hdr->frame_control);
601}
602
603void wl1271_tx_work_locked(struct wl1271 *wl)
604{
605 struct sk_buff *skb;
606 u32 buf_offset = 0;
607 bool sent_packets = false;
608 bool had_data = false;
609 bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
610 int ret;
611
612 if (unlikely(wl->state == WL1271_STATE_OFF))
613 return;
614
615 while ((skb = wl1271_skb_dequeue(wl))) {
616 if (wl1271_tx_is_data_present(skb))
617 had_data = true;
618
619 ret = wl1271_prepare_tx_frame(wl, skb, buf_offset);
620 if (ret == -EAGAIN) {
621 /*
622 * Aggregation buffer is full.
623 * Flush buffer and try again.
624 */
625 wl1271_skb_queue_head(wl, skb);
626 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
627 buf_offset, true);
628 sent_packets = true;
629 buf_offset = 0;
630 continue;
631 } else if (ret == -EBUSY) {
632 /*
633 * Firmware buffer is full.
634 * Queue back last skb, and stop aggregating.
635 */
636 wl1271_skb_queue_head(wl, skb);
637 /* No work left, avoid scheduling redundant tx work */
638 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
639 goto out_ack;
640 } else if (ret < 0) {
641 dev_kfree_skb(skb);
642 goto out_ack;
643 }
644 buf_offset += ret;
645 wl->tx_packets_count++;
646 }
647
648out_ack:
649 if (buf_offset) {
650 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
651 buf_offset, true);
652 sent_packets = true;
653 }
654 if (sent_packets) {
655 /*
656 * Interrupt the firmware with the new packets. This is only
657 * required for older hardware revisions
658 */
659 if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
660 wl1271_write32(wl, WL1271_HOST_WR_ACCESS,
661 wl->tx_packets_count);
662
663 wl1271_handle_tx_low_watermark(wl);
664 }
665 if (!is_ap && wl->conf.rx_streaming.interval && had_data &&
666 (wl->conf.rx_streaming.always ||
667 test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))) {
668 u32 timeout = wl->conf.rx_streaming.duration;
669
670 /* enable rx streaming */
671 if (!test_bit(WL1271_FLAG_RX_STREAMING_STARTED, &wl->flags))
672 ieee80211_queue_work(wl->hw,
673 &wl->rx_streaming_enable_work);
674
675 mod_timer(&wl->rx_streaming_timer,
676 jiffies + msecs_to_jiffies(timeout));
677 }
678}
679
680void wl1271_tx_work(struct work_struct *work)
681{
682 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
683 int ret;
684
685 mutex_lock(&wl->mutex);
686 ret = wl1271_ps_elp_wakeup(wl);
687 if (ret < 0)
688 goto out;
689
690 wl1271_tx_work_locked(wl);
691
692 wl1271_ps_elp_sleep(wl);
693out:
694 mutex_unlock(&wl->mutex);
695}
696
697static void wl1271_tx_complete_packet(struct wl1271 *wl,
698 struct wl1271_tx_hw_res_descr *result)
699{
700 struct ieee80211_tx_info *info;
701 struct sk_buff *skb;
702 int id = result->id;
703 int rate = -1;
704 u8 retries = 0;
705
706 /* check for id legality */
707 if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
708 wl1271_warning("TX result illegal id: %d", id);
709 return;
710 }
711
712 skb = wl->tx_frames[id];
713 info = IEEE80211_SKB_CB(skb);
714
715 if (wl12xx_is_dummy_packet(wl, skb)) {
716 wl1271_free_tx_id(wl, id);
717 return;
718 }
719
720 /* update the TX status info */
721 if (result->status == TX_SUCCESS) {
722 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
723 info->flags |= IEEE80211_TX_STAT_ACK;
724 rate = wl1271_rate_to_idx(result->rate_class_index, wl->band);
725 retries = result->ack_failures;
726 } else if (result->status == TX_RETRY_EXCEEDED) {
727 wl->stats.excessive_retries++;
728 retries = result->ack_failures;
729 }
730
731 info->status.rates[0].idx = rate;
732 info->status.rates[0].count = retries;
733 info->status.rates[0].flags = 0;
734 info->status.ack_signal = -1;
735
736 wl->stats.retry_count += result->ack_failures;
737
738 /*
739 * update sequence number only when relevant, i.e. only in
740 * sessions of TKIP, AES and GEM (not in open or WEP sessions)
741 */
742 if (info->control.hw_key &&
743 (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
744 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
745 info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
746 u8 fw_lsb = result->tx_security_sequence_number_lsb;
747 u8 cur_lsb = wl->tx_security_last_seq_lsb;
748
749 /*
750 * update security sequence number, taking care of potential
751 * wrap-around
752 */
753 wl->tx_security_seq += (fw_lsb - cur_lsb + 256) % 256;
754 wl->tx_security_last_seq_lsb = fw_lsb;
755 }
756
757 /* remove private header from packet */
758 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
759
760 /* remove TKIP header space if present */
761 if (info->control.hw_key &&
762 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
763 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
764 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
765 skb_pull(skb, WL1271_TKIP_IV_SPACE);
766 }
767
768 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
769 " status 0x%x",
770 result->id, skb, result->ack_failures,
771 result->rate_class_index, result->status);
772
773 /* return the packet to the stack */
774 skb_queue_tail(&wl->deferred_tx_queue, skb);
775 queue_work(wl->freezable_wq, &wl->netstack_work);
776 wl1271_free_tx_id(wl, result->id);
777}
778
779/* Called upon reception of a TX complete interrupt */
780void wl1271_tx_complete(struct wl1271 *wl)
781{
782 struct wl1271_acx_mem_map *memmap =
783 (struct wl1271_acx_mem_map *)wl->target_mem_map;
784 u32 count, fw_counter;
785 u32 i;
786
787 /* read the tx results from the chipset */
788 wl1271_read(wl, le32_to_cpu(memmap->tx_result),
789 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
790 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
791
792 /* write host counter to chipset (to ack) */
793 wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
794 offsetof(struct wl1271_tx_hw_res_if,
795 tx_result_host_counter), fw_counter);
796
797 count = fw_counter - wl->tx_results_count;
798 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
799
800 /* verify that the result buffer is not getting overrun */
801 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
802 wl1271_warning("TX result overflow from chipset: %d", count);
803
804 /* process the results */
805 for (i = 0; i < count; i++) {
806 struct wl1271_tx_hw_res_descr *result;
807 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
808
809 /* process the packet */
810 result = &(wl->tx_res_if->tx_results_queue[offset]);
811 wl1271_tx_complete_packet(wl, result);
812
813 wl->tx_results_count++;
814 }
815}
816
817void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
818{
819 struct sk_buff *skb;
820 int i;
821 unsigned long flags;
822 struct ieee80211_tx_info *info;
823 int total[NUM_TX_QUEUES];
824
825 for (i = 0; i < NUM_TX_QUEUES; i++) {
826 total[i] = 0;
827 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
828 wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
829 info = IEEE80211_SKB_CB(skb);
830 info->status.rates[0].idx = -1;
831 info->status.rates[0].count = 0;
832 ieee80211_tx_status_ni(wl->hw, skb);
833 total[i]++;
834 }
835 }
836
837 spin_lock_irqsave(&wl->wl_lock, flags);
838 for (i = 0; i < NUM_TX_QUEUES; i++)
839 wl->tx_queue_count[i] -= total[i];
840 spin_unlock_irqrestore(&wl->wl_lock, flags);
841
842 wl1271_handle_tx_low_watermark(wl);
843}
844
845/* caller must hold wl->mutex and TX must be stopped */
846void wl1271_tx_reset(struct wl1271 *wl, bool reset_tx_queues)
847{
848 int i;
849 struct sk_buff *skb;
850 struct ieee80211_tx_info *info;
851
852 /* TX failure */
853 if (wl->bss_type == BSS_TYPE_AP_BSS) {
854 for (i = 0; i < AP_MAX_LINKS; i++) {
855 wl1271_tx_reset_link_queues(wl, i);
856 wl->links[i].allocated_blks = 0;
857 wl->links[i].prev_freed_blks = 0;
858 }
859
860 wl->last_tx_hlid = 0;
861 } else {
862 for (i = 0; i < NUM_TX_QUEUES; i++) {
863 while ((skb = skb_dequeue(&wl->tx_queue[i]))) {
864 wl1271_debug(DEBUG_TX, "freeing skb 0x%p",
865 skb);
866
867 if (!wl12xx_is_dummy_packet(wl, skb)) {
868 info = IEEE80211_SKB_CB(skb);
869 info->status.rates[0].idx = -1;
870 info->status.rates[0].count = 0;
871 ieee80211_tx_status_ni(wl->hw, skb);
872 }
873 }
874 wl->tx_queue_count[i] = 0;
875 }
876 }
877
878 wl->stopped_queues_map = 0;
879
880 /*
881 * Make sure the driver is at a consistent state, in case this
882 * function is called from a context other than interface removal.
883 * This call will always wake the TX queues.
884 */
885 if (reset_tx_queues)
886 wl1271_handle_tx_low_watermark(wl);
887
888 for (i = 0; i < ACX_TX_DESCRIPTORS; i++) {
889 if (wl->tx_frames[i] == NULL)
890 continue;
891
892 skb = wl->tx_frames[i];
893 wl1271_free_tx_id(wl, i);
894 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
895
896 if (!wl12xx_is_dummy_packet(wl, skb)) {
897 /*
898 * Remove private headers before passing the skb to
899 * mac80211
900 */
901 info = IEEE80211_SKB_CB(skb);
902 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
903 if (info->control.hw_key &&
904 info->control.hw_key->cipher ==
905 WLAN_CIPHER_SUITE_TKIP) {
906 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
907 memmove(skb->data + WL1271_TKIP_IV_SPACE,
908 skb->data, hdrlen);
909 skb_pull(skb, WL1271_TKIP_IV_SPACE);
910 }
911
912 info->status.rates[0].idx = -1;
913 info->status.rates[0].count = 0;
914
915 ieee80211_tx_status_ni(wl->hw, skb);
916 }
917 }
918}
919
920#define WL1271_TX_FLUSH_TIMEOUT 500000
921
922/* caller must *NOT* hold wl->mutex */
923void wl1271_tx_flush(struct wl1271 *wl)
924{
925 unsigned long timeout;
926 timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
927
928 while (!time_after(jiffies, timeout)) {
929 mutex_lock(&wl->mutex);
930 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
931 wl->tx_frames_cnt,
932 wl1271_tx_total_queue_count(wl));
933 if ((wl->tx_frames_cnt == 0) &&
934 (wl1271_tx_total_queue_count(wl) == 0)) {
935 mutex_unlock(&wl->mutex);
936 return;
937 }
938 mutex_unlock(&wl->mutex);
939 msleep(1);
940 }
941
942 wl1271_warning("Unable to flush all TX buffers, timed out.");
943}
944
945u32 wl1271_tx_min_rate_get(struct wl1271 *wl)
946{
947 int i;
948 u32 rate = 0;
949
950 if (!wl->basic_rate_set) {
951 WARN_ON(1);
952 wl->basic_rate_set = wl->conf.tx.basic_rate;
953 }
954
955 for (i = 0; !rate; i++) {
956 if ((wl->basic_rate_set >> i) & 0x1)
957 rate = 1 << i;
958 }
959
960 return rate;
961}