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wl12xx: temporarily disable advanced ap functions
[linux-2.6/libata-dev.git] / drivers / net / wireless / wl12xx / tx.c
blob938af1de6c2c63b7c2d9a4a5394047d840d47cca
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
34 static 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
51 static 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
65 static 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
76 static 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
98 static 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
114 #if 0
115 static void wl1271_tx_regulate_link(struct wl1271 *wl, u8 hlid)
116 {
117 bool fw_ps;
118 u8 tx_blks;
119
120 /* only regulate station links */
121 if (hlid < WL1271_AP_STA_HLID_START)
122 return;
123
124 fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
125 tx_blks = wl->links[hlid].allocated_blks;
126
127 /*
128 * if in FW PS and there is enough data in FW we can put the link
129 * into high-level PS and clean out its TX queues.
130 */
131 if (fw_ps && tx_blks >= WL1271_PS_STA_MAX_BLOCKS)
132 wl1271_ps_link_start(wl, hlid, true);
133 }
134 #endif
135
136 u8 wl1271_tx_get_hlid(struct sk_buff *skb)
137 {
138 struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb);
139
140 if (control->control.sta) {
141 struct wl1271_station *wl_sta;
142
143 wl_sta = (struct wl1271_station *)
144 control->control.sta->drv_priv;
145 return wl_sta->hlid;
146 } else {
147 struct ieee80211_hdr *hdr;
148
149 hdr = (struct ieee80211_hdr *)skb->data;
150 if (ieee80211_is_mgmt(hdr->frame_control))
151 return WL1271_AP_GLOBAL_HLID;
152 else
153 return WL1271_AP_BROADCAST_HLID;
154 }
155 }
156
157 static unsigned int wl12xx_calc_packet_alignment(struct wl1271 *wl,
158 unsigned int packet_length)
159 {
160 if (wl->quirks & WL12XX_QUIRK_BLOCKSIZE_ALIGNMENT)
161 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
162 else
163 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
164 }
165
166 static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra,
167 u32 buf_offset, u8 hlid)
168 {
169 struct wl1271_tx_hw_descr *desc;
170 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
171 u32 len;
172 u32 total_blocks;
173 int id, ret = -EBUSY;
174
175 /* we use 1 spare block */
176 u32 spare_blocks = 1;
177
178 if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
179 return -EAGAIN;
180
181 /* allocate free identifier for the packet */
182 id = wl1271_alloc_tx_id(wl, skb);
183 if (id < 0)
184 return id;
185
186 /* approximate the number of blocks required for this packet
187 in the firmware */
188 len = wl12xx_calc_packet_alignment(wl, total_len);
189
190 total_blocks = (len + TX_HW_BLOCK_SIZE - 1) / TX_HW_BLOCK_SIZE +
191 spare_blocks;
192
193 if (total_blocks <= wl->tx_blocks_available) {
194 desc = (struct wl1271_tx_hw_descr *)skb_push(
195 skb, total_len - skb->len);
196
197 /* HW descriptor fields change between wl127x and wl128x */
198 if (wl->chip.id == CHIP_ID_1283_PG20) {
199 desc->wl128x_mem.total_mem_blocks = total_blocks;
200 } else {
201 desc->wl127x_mem.extra_blocks = spare_blocks;
202 desc->wl127x_mem.total_mem_blocks = total_blocks;
203 }
204
205 desc->id = id;
206
207 wl->tx_blocks_available -= total_blocks;
208 wl->tx_allocated_blocks += total_blocks;
209
210 if (wl->bss_type == BSS_TYPE_AP_BSS)
211 wl->links[hlid].allocated_blks += total_blocks;
212
213 ret = 0;
214
215 wl1271_debug(DEBUG_TX,
216 "tx_allocate: size: %d, blocks: %d, id: %d",
217 total_len, total_blocks, id);
218 } else {
219 wl1271_free_tx_id(wl, id);
220 }
221
222 return ret;
223 }
224
225 static bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
226 {
227 return wl->dummy_packet == skb;
228 }
229
230 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
231 u32 extra, struct ieee80211_tx_info *control,
232 u8 hlid)
233 {
234 struct timespec ts;
235 struct wl1271_tx_hw_descr *desc;
236 int aligned_len, ac, rate_idx;
237 s64 hosttime;
238 u16 tx_attr;
239
240 desc = (struct wl1271_tx_hw_descr *) skb->data;
241
242 /* relocate space for security header */
243 if (extra) {
244 void *framestart = skb->data + sizeof(*desc);
245 u16 fc = *(u16 *)(framestart + extra);
246 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
247 memmove(framestart, framestart + extra, hdrlen);
248 }
249
250 /* configure packet life time */
251 getnstimeofday(&ts);
252 hosttime = (timespec_to_ns(&ts) >> 10);
253 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
254
255 if (wl->bss_type != BSS_TYPE_AP_BSS)
256 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
257 else
258 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
259
260 /* queue */
261 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
262 desc->tid = skb->priority;
263
264 if (wl12xx_is_dummy_packet(wl, skb)) {
265 /*
266 * FW expects the dummy packet to have an invalid session id -
267 * any session id that is different than the one set in the join
268 */
269 tx_attr = ((~wl->session_counter) <<
270 TX_HW_ATTR_OFST_SESSION_COUNTER) &
271 TX_HW_ATTR_SESSION_COUNTER;
272
273 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
274 } else {
275 /* configure the tx attributes */
276 tx_attr =
277 wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
278 }
279
280 if (wl->bss_type != BSS_TYPE_AP_BSS) {
281 desc->aid = hlid;
282
283 /* if the packets are destined for AP (have a STA entry)
284 send them with AP rate policies, otherwise use default
285 basic rates */
286 if (control->control.sta)
287 rate_idx = ACX_TX_AP_FULL_RATE;
288 else
289 rate_idx = ACX_TX_BASIC_RATE;
290 } else {
291 desc->hlid = hlid;
292 switch (hlid) {
293 case WL1271_AP_GLOBAL_HLID:
294 rate_idx = ACX_TX_AP_MODE_MGMT_RATE;
295 break;
296 case WL1271_AP_BROADCAST_HLID:
297 rate_idx = ACX_TX_AP_MODE_BCST_RATE;
298 break;
299 default:
300 rate_idx = ac;
301 break;
302 }
303 }
304
305 tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
306 desc->reserved = 0;
307
308 aligned_len = wl12xx_calc_packet_alignment(wl, skb->len);
309
310 if (wl->chip.id == CHIP_ID_1283_PG20) {
311 desc->wl128x_mem.extra_bytes = aligned_len - skb->len;
312 desc->length = cpu_to_le16(aligned_len >> 2);
313
314 wl1271_debug(DEBUG_TX, "tx_fill_hdr: hlid: %d "
315 "tx_attr: 0x%x len: %d life: %d mem: %d",
316 desc->hlid, tx_attr,
317 le16_to_cpu(desc->length),
318 le16_to_cpu(desc->life_time),
319 desc->wl128x_mem.total_mem_blocks);
320 } else {
321 int pad;
322
323 /* Store the aligned length in terms of words */
324 desc->length = cpu_to_le16(aligned_len >> 2);
325
326 /* calculate number of padding bytes */
327 pad = aligned_len - skb->len;
328 tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
329
330 wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d hlid: %d "
331 "tx_attr: 0x%x len: %d life: %d mem: %d", pad,
332 desc->hlid, tx_attr,
333 le16_to_cpu(desc->length),
334 le16_to_cpu(desc->life_time),
335 desc->wl127x_mem.total_mem_blocks);
336 }
337
338 desc->tx_attr = cpu_to_le16(tx_attr);
339 }
340
341 /* caller must hold wl->mutex */
342 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb,
343 u32 buf_offset)
344 {
345 struct ieee80211_tx_info *info;
346 u32 extra = 0;
347 int ret = 0;
348 u32 total_len;
349 u8 hlid;
350
351 if (!skb)
352 return -EINVAL;
353
354 info = IEEE80211_SKB_CB(skb);
355
356 if (info->control.hw_key &&
357 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
358 extra = WL1271_TKIP_IV_SPACE;
359
360 if (info->control.hw_key) {
361 bool is_wep;
362 u8 idx = info->control.hw_key->hw_key_idx;
363 u32 cipher = info->control.hw_key->cipher;
364
365 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
366 (cipher == WLAN_CIPHER_SUITE_WEP104);
367
368 if (unlikely(is_wep && wl->default_key != idx)) {
369 ret = wl1271_set_default_wep_key(wl, idx);
370 if (ret < 0)
371 return ret;
372 wl->default_key = idx;
373 }
374 }
375
376 if (wl->bss_type == BSS_TYPE_AP_BSS)
377 hlid = wl1271_tx_get_hlid(skb);
378 else
379 hlid = TX_HW_DEFAULT_AID;
380
381 ret = wl1271_tx_allocate(wl, skb, extra, buf_offset, hlid);
382 if (ret < 0)
383 return ret;
384
385 wl1271_tx_fill_hdr(wl, skb, extra, info, hlid);
386
387 if (wl->bss_type == BSS_TYPE_AP_BSS) {
388 wl1271_tx_ap_update_inconnection_sta(wl, skb);
389 #if 0
390 wl1271_tx_regulate_link(wl, hlid);
391 #endif
392 } else {
393 wl1271_tx_update_filters(wl, skb);
394 }
395
396 /*
397 * The length of each packet is stored in terms of
398 * words. Thus, we must pad the skb data to make sure its
399 * length is aligned. The number of padding bytes is computed
400 * and set in wl1271_tx_fill_hdr.
401 * In special cases, we want to align to a specific block size
402 * (eg. for wl128x with SDIO we align to 256).
403 */
404 total_len = wl12xx_calc_packet_alignment(wl, skb->len);
405
406 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
407 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
408
409 /* Revert side effects in the dummy packet skb, so it can be reused */
410 if (wl12xx_is_dummy_packet(wl, skb))
411 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
412
413 return total_len;
414 }
415
416 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
417 {
418 struct ieee80211_supported_band *band;
419 u32 enabled_rates = 0;
420 int bit;
421
422 band = wl->hw->wiphy->bands[wl->band];
423 for (bit = 0; bit < band->n_bitrates; bit++) {
424 if (rate_set & 0x1)
425 enabled_rates |= band->bitrates[bit].hw_value;
426 rate_set >>= 1;
427 }
428
429 #ifdef CONFIG_WL12XX_HT
430 /* MCS rates indication are on bits 16 - 23 */
431 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
432
433 for (bit = 0; bit < 8; bit++) {
434 if (rate_set & 0x1)
435 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
436 rate_set >>= 1;
437 }
438 #endif
439
440 return enabled_rates;
441 }
442
443 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
444 {
445 unsigned long flags;
446 int i;
447
448 for (i = 0; i < NUM_TX_QUEUES; i++) {
449 if (test_bit(i, &wl->stopped_queues_map) &&
450 wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
451 /* firmware buffer has space, restart queues */
452 spin_lock_irqsave(&wl->wl_lock, flags);
453 ieee80211_wake_queue(wl->hw,
454 wl1271_tx_get_mac80211_queue(i));
455 clear_bit(i, &wl->stopped_queues_map);
456 spin_unlock_irqrestore(&wl->wl_lock, flags);
457 }
458 }
459 }
460
461 static struct sk_buff *wl1271_sta_skb_dequeue(struct wl1271 *wl)
462 {
463 struct sk_buff *skb = NULL;
464 unsigned long flags;
465
466 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VO]);
467 if (skb)
468 goto out;
469 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VI]);
470 if (skb)
471 goto out;
472 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BE]);
473 if (skb)
474 goto out;
475 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BK]);
476
477 out:
478 if (skb) {
479 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
480 spin_lock_irqsave(&wl->wl_lock, flags);
481 wl->tx_queue_count[q]--;
482 spin_unlock_irqrestore(&wl->wl_lock, flags);
483 }
484
485 return skb;
486 }
487
488 static struct sk_buff *wl1271_ap_skb_dequeue(struct wl1271 *wl)
489 {
490 struct sk_buff *skb = NULL;
491 unsigned long flags;
492 int i, h, start_hlid;
493
494 /* start from the link after the last one */
495 start_hlid = (wl->last_tx_hlid + 1) % AP_MAX_LINKS;
496
497 /* dequeue according to AC, round robin on each link */
498 for (i = 0; i < AP_MAX_LINKS; i++) {
499 h = (start_hlid + i) % AP_MAX_LINKS;
500
501 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VO]);
502 if (skb)
503 goto out;
504 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VI]);
505 if (skb)
506 goto out;
507 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BE]);
508 if (skb)
509 goto out;
510 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BK]);
511 if (skb)
512 goto out;
513 }
514
515 out:
516 if (skb) {
517 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
518 wl->last_tx_hlid = h;
519 spin_lock_irqsave(&wl->wl_lock, flags);
520 wl->tx_queue_count[q]--;
521 spin_unlock_irqrestore(&wl->wl_lock, flags);
522 } else {
523 wl->last_tx_hlid = 0;
524 }
525
526 return skb;
527 }
528
529 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
530 {
531 unsigned long flags;
532 struct sk_buff *skb = NULL;
533
534 if (wl->bss_type == BSS_TYPE_AP_BSS)
535 skb = wl1271_ap_skb_dequeue(wl);
536 else
537 skb = wl1271_sta_skb_dequeue(wl);
538
539 if (!skb &&
540 test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
541 int q;
542
543 skb = wl->dummy_packet;
544 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
545 spin_lock_irqsave(&wl->wl_lock, flags);
546 wl->tx_queue_count[q]--;
547 spin_unlock_irqrestore(&wl->wl_lock, flags);
548 }
549
550 return skb;
551 }
552
553 static void wl1271_skb_queue_head(struct wl1271 *wl, struct sk_buff *skb)
554 {
555 unsigned long flags;
556 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
557
558 if (wl12xx_is_dummy_packet(wl, skb)) {
559 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
560 } else if (wl->bss_type == BSS_TYPE_AP_BSS) {
561 u8 hlid = wl1271_tx_get_hlid(skb);
562 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
563
564 /* make sure we dequeue the same packet next time */
565 wl->last_tx_hlid = (hlid + AP_MAX_LINKS - 1) % AP_MAX_LINKS;
566 } else {
567 skb_queue_head(&wl->tx_queue[q], skb);
568 }
569
570 spin_lock_irqsave(&wl->wl_lock, flags);
571 wl->tx_queue_count[q]++;
572 spin_unlock_irqrestore(&wl->wl_lock, flags);
573 }
574
575 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
576 {
577 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
578
579 return ieee80211_is_data_present(hdr->frame_control);
580 }
581
582 void wl1271_tx_work_locked(struct wl1271 *wl)
583 {
584 struct sk_buff *skb;
585 u32 buf_offset = 0;
586 bool sent_packets = false;
587 bool had_data = false;
588 bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
589 int ret;
590
591 if (unlikely(wl->state == WL1271_STATE_OFF))
592 return;
593
594 while ((skb = wl1271_skb_dequeue(wl))) {
595 if (wl1271_tx_is_data_present(skb))
596 had_data = true;
597
598 ret = wl1271_prepare_tx_frame(wl, skb, buf_offset);
599 if (ret == -EAGAIN) {
600 /*
601 * Aggregation buffer is full.
602 * Flush buffer and try again.
603 */
604 wl1271_skb_queue_head(wl, skb);
605 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
606 buf_offset, true);
607 sent_packets = true;
608 buf_offset = 0;
609 continue;
610 } else if (ret == -EBUSY) {
611 /*
612 * Firmware buffer is full.
613 * Queue back last skb, and stop aggregating.
614 */
615 wl1271_skb_queue_head(wl, skb);
616 /* No work left, avoid scheduling redundant tx work */
617 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
618 goto out_ack;
619 } else if (ret < 0) {
620 dev_kfree_skb(skb);
621 goto out_ack;
622 }
623 buf_offset += ret;
624 wl->tx_packets_count++;
625 }
626
627 out_ack:
628 if (buf_offset) {
629 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
630 buf_offset, true);
631 sent_packets = true;
632 }
633 if (sent_packets) {
634 /*
635 * Interrupt the firmware with the new packets. This is only
636 * required for older hardware revisions
637 */
638 if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
639 wl1271_write32(wl, WL1271_HOST_WR_ACCESS,
640 wl->tx_packets_count);
641
642 wl1271_handle_tx_low_watermark(wl);
643 }
644 if (!is_ap && wl->conf.rx_streaming.interval && had_data &&
645 (wl->conf.rx_streaming.always ||
646 test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))) {
647 u32 timeout = wl->conf.rx_streaming.duration;
648
649 /* enable rx streaming */
650 if (!test_bit(WL1271_FLAG_RX_STREAMING_STARTED, &wl->flags))
651 ieee80211_queue_work(wl->hw,
652 &wl->rx_streaming_enable_work);
653
654 mod_timer(&wl->rx_streaming_timer,
655 jiffies + msecs_to_jiffies(timeout));
656 }
657 }
658
659 void wl1271_tx_work(struct work_struct *work)
660 {
661 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
662 int ret;
663
664 mutex_lock(&wl->mutex);
665 ret = wl1271_ps_elp_wakeup(wl);
666 if (ret < 0)
667 goto out;
668
669 wl1271_tx_work_locked(wl);
670
671 wl1271_ps_elp_sleep(wl);
672 out:
673 mutex_unlock(&wl->mutex);
674 }
675
676 static void wl1271_tx_complete_packet(struct wl1271 *wl,
677 struct wl1271_tx_hw_res_descr *result)
678 {
679 struct ieee80211_tx_info *info;
680 struct sk_buff *skb;
681 int id = result->id;
682 int rate = -1;
683 u8 retries = 0;
684
685 /* check for id legality */
686 if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
687 wl1271_warning("TX result illegal id: %d", id);
688 return;
689 }
690
691 skb = wl->tx_frames[id];
692 info = IEEE80211_SKB_CB(skb);
693
694 if (wl12xx_is_dummy_packet(wl, skb)) {
695 wl1271_free_tx_id(wl, id);
696 return;
697 }
698
699 /* update the TX status info */
700 if (result->status == TX_SUCCESS) {
701 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
702 info->flags |= IEEE80211_TX_STAT_ACK;
703 rate = wl1271_rate_to_idx(result->rate_class_index, wl->band);
704 retries = result->ack_failures;
705 } else if (result->status == TX_RETRY_EXCEEDED) {
706 wl->stats.excessive_retries++;
707 retries = result->ack_failures;
708 }
709
710 info->status.rates[0].idx = rate;
711 info->status.rates[0].count = retries;
712 info->status.rates[0].flags = 0;
713 info->status.ack_signal = -1;
714
715 wl->stats.retry_count += result->ack_failures;
716
717 /*
718 * update sequence number only when relevant, i.e. only in
719 * sessions of TKIP, AES and GEM (not in open or WEP sessions)
720 */
721 if (info->control.hw_key &&
722 (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
723 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
724 info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
725 u8 fw_lsb = result->tx_security_sequence_number_lsb;
726 u8 cur_lsb = wl->tx_security_last_seq_lsb;
727
728 /*
729 * update security sequence number, taking care of potential
730 * wrap-around
731 */
732 wl->tx_security_seq += (fw_lsb - cur_lsb + 256) % 256;
733 wl->tx_security_last_seq_lsb = fw_lsb;
734 }
735
736 /* remove private header from packet */
737 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
738
739 /* remove TKIP header space if present */
740 if (info->control.hw_key &&
741 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
742 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
743 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
744 skb_pull(skb, WL1271_TKIP_IV_SPACE);
745 }
746
747 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
748 " status 0x%x",
749 result->id, skb, result->ack_failures,
750 result->rate_class_index, result->status);
751
752 /* return the packet to the stack */
753 skb_queue_tail(&wl->deferred_tx_queue, skb);
754 queue_work(wl->freezable_wq, &wl->netstack_work);
755 wl1271_free_tx_id(wl, result->id);
756 }
757
758 /* Called upon reception of a TX complete interrupt */
759 void wl1271_tx_complete(struct wl1271 *wl)
760 {
761 struct wl1271_acx_mem_map *memmap =
762 (struct wl1271_acx_mem_map *)wl->target_mem_map;
763 u32 count, fw_counter;
764 u32 i;
765
766 /* read the tx results from the chipset */
767 wl1271_read(wl, le32_to_cpu(memmap->tx_result),
768 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
769 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
770
771 /* write host counter to chipset (to ack) */
772 wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
773 offsetof(struct wl1271_tx_hw_res_if,
774 tx_result_host_counter), fw_counter);
775
776 count = fw_counter - wl->tx_results_count;
777 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
778
779 /* verify that the result buffer is not getting overrun */
780 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
781 wl1271_warning("TX result overflow from chipset: %d", count);
782
783 /* process the results */
784 for (i = 0; i < count; i++) {
785 struct wl1271_tx_hw_res_descr *result;
786 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
787
788 /* process the packet */
789 result = &(wl->tx_res_if->tx_results_queue[offset]);
790 wl1271_tx_complete_packet(wl, result);
791
792 wl->tx_results_count++;
793 }
794 }
795
796 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
797 {
798 struct sk_buff *skb;
799 int i;
800 unsigned long flags;
801 struct ieee80211_tx_info *info;
802 int total[NUM_TX_QUEUES];
803
804 for (i = 0; i < NUM_TX_QUEUES; i++) {
805 total[i] = 0;
806 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
807 wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
808 info = IEEE80211_SKB_CB(skb);
809 info->status.rates[0].idx = -1;
810 info->status.rates[0].count = 0;
811 ieee80211_tx_status_ni(wl->hw, skb);
812 total[i]++;
813 }
814 }
815
816 spin_lock_irqsave(&wl->wl_lock, flags);
817 for (i = 0; i < NUM_TX_QUEUES; i++)
818 wl->tx_queue_count[i] -= total[i];
819 spin_unlock_irqrestore(&wl->wl_lock, flags);
820
821 wl1271_handle_tx_low_watermark(wl);
822 }
823
824 /* caller must hold wl->mutex and TX must be stopped */
825 void wl1271_tx_reset(struct wl1271 *wl, bool reset_tx_queues)
826 {
827 int i;
828 struct sk_buff *skb;
829 struct ieee80211_tx_info *info;
830
831 /* TX failure */
832 if (wl->bss_type == BSS_TYPE_AP_BSS) {
833 for (i = 0; i < AP_MAX_LINKS; i++) {
834 wl1271_tx_reset_link_queues(wl, i);
835 wl->links[i].allocated_blks = 0;
836 wl->links[i].prev_freed_blks = 0;
837 }
838
839 wl->last_tx_hlid = 0;
840 } else {
841 for (i = 0; i < NUM_TX_QUEUES; i++) {
842 while ((skb = skb_dequeue(&wl->tx_queue[i]))) {
843 wl1271_debug(DEBUG_TX, "freeing skb 0x%p",
844 skb);
845
846 if (!wl12xx_is_dummy_packet(wl, skb)) {
847 info = IEEE80211_SKB_CB(skb);
848 info->status.rates[0].idx = -1;
849 info->status.rates[0].count = 0;
850 ieee80211_tx_status_ni(wl->hw, skb);
851 }
852 }
853 wl->tx_queue_count[i] = 0;
854 }
855 }
856
857 wl->stopped_queues_map = 0;
858
859 /*
860 * Make sure the driver is at a consistent state, in case this
861 * function is called from a context other than interface removal.
862 * This call will always wake the TX queues.
863 */
864 if (reset_tx_queues)
865 wl1271_handle_tx_low_watermark(wl);
866
867 for (i = 0; i < ACX_TX_DESCRIPTORS; i++) {
868 if (wl->tx_frames[i] == NULL)
869 continue;
870
871 skb = wl->tx_frames[i];
872 wl1271_free_tx_id(wl, i);
873 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
874
875 if (!wl12xx_is_dummy_packet(wl, skb)) {
876 /*
877 * Remove private headers before passing the skb to
878 * mac80211
879 */
880 info = IEEE80211_SKB_CB(skb);
881 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
882 if (info->control.hw_key &&
883 info->control.hw_key->cipher ==
884 WLAN_CIPHER_SUITE_TKIP) {
885 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
886 memmove(skb->data + WL1271_TKIP_IV_SPACE,
887 skb->data, hdrlen);
888 skb_pull(skb, WL1271_TKIP_IV_SPACE);
889 }
890
891 info->status.rates[0].idx = -1;
892 info->status.rates[0].count = 0;
893
894 ieee80211_tx_status_ni(wl->hw, skb);
895 }
896 }
897 }
898
899 #define WL1271_TX_FLUSH_TIMEOUT 500000
900
901 /* caller must *NOT* hold wl->mutex */
902 void wl1271_tx_flush(struct wl1271 *wl)
903 {
904 unsigned long timeout;
905 timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
906
907 while (!time_after(jiffies, timeout)) {
908 mutex_lock(&wl->mutex);
909 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
910 wl->tx_frames_cnt,
911 wl1271_tx_total_queue_count(wl));
912 if ((wl->tx_frames_cnt == 0) &&
913 (wl1271_tx_total_queue_count(wl) == 0)) {
914 mutex_unlock(&wl->mutex);
915 return;
916 }
917 mutex_unlock(&wl->mutex);
918 msleep(1);
919 }
920
921 wl1271_warning("Unable to flush all TX buffers, timed out.");
922 }
923
924 u32 wl1271_tx_min_rate_get(struct wl1271 *wl)
925 {
926 int i;
927 u32 rate = 0;
928
929 if (!wl->basic_rate_set) {
930 WARN_ON(1);
931 wl->basic_rate_set = wl->conf.tx.basic_rate;
932 }
933
934 for (i = 0; !rate; i++) {
935 if ((wl->basic_rate_set >> i) & 0x1)
936 rate = 1 << i;
937 }
938
939 return rate;
940 }
Linux 2.6 libata-dev (mirror)