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wl12xx: enable AP advanced functionality
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / wireless / wl12xx / tx.c
blob0f1578577b1a7be0148c1ef5cff5d4bb8016a752
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 = wl12xx_cmd_set_default_wep_key(wl, id,
41 wl->ap_bcast_hlid);
42 else
43 ret = wl12xx_cmd_set_default_wep_key(wl, id, wl->sta_hlid);
44
45 if (ret < 0)
46 return ret;
47
48 wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
49 return 0;
50 }
51
52 static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
53 {
54 int id;
55
56 id = find_first_zero_bit(wl->tx_frames_map, ACX_TX_DESCRIPTORS);
57 if (id >= ACX_TX_DESCRIPTORS)
58 return -EBUSY;
59
60 __set_bit(id, wl->tx_frames_map);
61 wl->tx_frames[id] = skb;
62 wl->tx_frames_cnt++;
63 return id;
64 }
65
66 static void wl1271_free_tx_id(struct wl1271 *wl, int id)
67 {
68 if (__test_and_clear_bit(id, wl->tx_frames_map)) {
69 if (unlikely(wl->tx_frames_cnt == ACX_TX_DESCRIPTORS))
70 clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
71
72 wl->tx_frames[id] = NULL;
73 wl->tx_frames_cnt--;
74 }
75 }
76
77 static int wl1271_tx_update_filters(struct wl1271 *wl,
78 struct sk_buff *skb)
79 {
80 struct ieee80211_hdr *hdr;
81 int ret;
82
83 hdr = (struct ieee80211_hdr *)(skb->data +
84 sizeof(struct wl1271_tx_hw_descr));
85
86 /*
87 * stop bssid-based filtering before transmitting authentication
88 * requests. this way the hw will never drop authentication
89 * responses coming from BSSIDs it isn't familiar with (e.g. on
90 * roaming)
91 */
92 if (!ieee80211_is_auth(hdr->frame_control))
93 return 0;
94
95 if (wl->dev_hlid != WL12XX_INVALID_LINK_ID)
96 goto out;
97
98 wl1271_debug(DEBUG_CMD, "starting device role for roaming");
99 ret = wl12xx_cmd_role_start_dev(wl);
100 if (ret < 0)
101 goto out;
102
103 ret = wl12xx_roc(wl, wl->dev_role_id);
104 if (ret < 0)
105 goto out;
106 out:
107 return 0;
108 }
109
110 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
111 struct sk_buff *skb)
112 {
113 struct ieee80211_hdr *hdr;
114
115 /*
116 * add the station to the known list before transmitting the
117 * authentication response. this way it won't get de-authed by FW
118 * when transmitting too soon.
119 */
120 hdr = (struct ieee80211_hdr *)(skb->data +
121 sizeof(struct wl1271_tx_hw_descr));
122 if (ieee80211_is_auth(hdr->frame_control))
123 wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
124 }
125
126 static void wl1271_tx_regulate_link(struct wl1271 *wl, u8 hlid)
127 {
128 bool fw_ps;
129 u8 tx_pkts;
130
131 /* only regulate station links */
132 if (hlid < WL1271_AP_STA_HLID_START)
133 return;
134
135 fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
136 tx_pkts = wl->links[hlid].allocated_pkts;
137
138 /*
139 * if in FW PS and there is enough data in FW we can put the link
140 * into high-level PS and clean out its TX queues.
141 */
142 if (fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
143 wl1271_ps_link_start(wl, hlid, true);
144 }
145
146 static bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
147 {
148 return wl->dummy_packet == skb;
149 }
150
151 u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct sk_buff *skb)
152 {
153 struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb);
154
155 if (control->control.sta) {
156 struct wl1271_station *wl_sta;
157
158 wl_sta = (struct wl1271_station *)
159 control->control.sta->drv_priv;
160 return wl_sta->hlid;
161 } else {
162 struct ieee80211_hdr *hdr;
163
164 if (!test_bit(WL1271_FLAG_AP_STARTED, &wl->flags))
165 return wl->system_hlid;
166
167 hdr = (struct ieee80211_hdr *)skb->data;
168 if (ieee80211_is_mgmt(hdr->frame_control))
169 return wl->ap_global_hlid;
170 else
171 return wl->ap_bcast_hlid;
172 }
173 }
174
175 static u8 wl1271_tx_get_hlid(struct wl1271 *wl, struct sk_buff *skb)
176 {
177 if (wl12xx_is_dummy_packet(wl, skb))
178 return wl->system_hlid;
179
180 if (wl->bss_type == BSS_TYPE_AP_BSS)
181 return wl12xx_tx_get_hlid_ap(wl, skb);
182
183 if (test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags) ||
184 test_bit(WL1271_FLAG_IBSS_JOINED, &wl->flags))
185 return wl->sta_hlid;
186 else
187 return wl->dev_hlid;
188 }
189
190 static unsigned int wl12xx_calc_packet_alignment(struct wl1271 *wl,
191 unsigned int packet_length)
192 {
193 if (wl->quirks & WL12XX_QUIRK_BLOCKSIZE_ALIGNMENT)
194 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
195 else
196 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
197 }
198
199 static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra,
200 u32 buf_offset, u8 hlid)
201 {
202 struct wl1271_tx_hw_descr *desc;
203 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
204 u32 len;
205 u32 total_blocks;
206 int id, ret = -EBUSY, ac;
207
208 /* we use 1 spare block */
209 u32 spare_blocks = 1;
210
211 if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
212 return -EAGAIN;
213
214 /* allocate free identifier for the packet */
215 id = wl1271_alloc_tx_id(wl, skb);
216 if (id < 0)
217 return id;
218
219 /* approximate the number of blocks required for this packet
220 in the firmware */
221 len = wl12xx_calc_packet_alignment(wl, total_len);
222
223 total_blocks = (len + TX_HW_BLOCK_SIZE - 1) / TX_HW_BLOCK_SIZE +
224 spare_blocks;
225
226 if (total_blocks <= wl->tx_blocks_available) {
227 desc = (struct wl1271_tx_hw_descr *)skb_push(
228 skb, total_len - skb->len);
229
230 /* HW descriptor fields change between wl127x and wl128x */
231 if (wl->chip.id == CHIP_ID_1283_PG20) {
232 desc->wl128x_mem.total_mem_blocks = total_blocks;
233 } else {
234 desc->wl127x_mem.extra_blocks = spare_blocks;
235 desc->wl127x_mem.total_mem_blocks = total_blocks;
236 }
237
238 desc->id = id;
239
240 wl->tx_blocks_available -= total_blocks;
241 wl->tx_allocated_blocks += total_blocks;
242
243 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
244 wl->tx_allocated_pkts[ac]++;
245
246 if (wl->bss_type == BSS_TYPE_AP_BSS &&
247 hlid >= WL1271_AP_STA_HLID_START)
248 wl->links[hlid].allocated_pkts++;
249
250 ret = 0;
251
252 wl1271_debug(DEBUG_TX,
253 "tx_allocate: size: %d, blocks: %d, id: %d",
254 total_len, total_blocks, id);
255 } else {
256 wl1271_free_tx_id(wl, id);
257 }
258
259 return ret;
260 }
261
262 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
263 u32 extra, struct ieee80211_tx_info *control,
264 u8 hlid)
265 {
266 struct timespec ts;
267 struct wl1271_tx_hw_descr *desc;
268 int aligned_len, ac, rate_idx;
269 s64 hosttime;
270 u16 tx_attr;
271
272 desc = (struct wl1271_tx_hw_descr *) skb->data;
273
274 /* relocate space for security header */
275 if (extra) {
276 void *framestart = skb->data + sizeof(*desc);
277 u16 fc = *(u16 *)(framestart + extra);
278 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
279 memmove(framestart, framestart + extra, hdrlen);
280 }
281
282 /* configure packet life time */
283 getnstimeofday(&ts);
284 hosttime = (timespec_to_ns(&ts) >> 10);
285 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
286
287 if (wl->bss_type != BSS_TYPE_AP_BSS)
288 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
289 else
290 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
291
292 /* queue */
293 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
294 desc->tid = skb->priority;
295
296 if (wl12xx_is_dummy_packet(wl, skb)) {
297 /*
298 * FW expects the dummy packet to have an invalid session id -
299 * any session id that is different than the one set in the join
300 */
301 tx_attr = ((~wl->session_counter) <<
302 TX_HW_ATTR_OFST_SESSION_COUNTER) &
303 TX_HW_ATTR_SESSION_COUNTER;
304
305 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
306 } else {
307 /* configure the tx attributes */
308 tx_attr =
309 wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
310 }
311
312 desc->hlid = hlid;
313
314 if (wl->bss_type != BSS_TYPE_AP_BSS) {
315 /* if the packets are destined for AP (have a STA entry)
316 send them with AP rate policies, otherwise use default
317 basic rates */
318 if (control->control.sta)
319 rate_idx = ACX_TX_AP_FULL_RATE;
320 else
321 rate_idx = ACX_TX_BASIC_RATE;
322 } else {
323 if (hlid == wl->ap_global_hlid)
324 rate_idx = ACX_TX_AP_MODE_MGMT_RATE;
325 else if (hlid == wl->ap_bcast_hlid)
326 rate_idx = ACX_TX_AP_MODE_BCST_RATE;
327 else
328 rate_idx = ac;
329 }
330
331 tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
332 desc->reserved = 0;
333
334 aligned_len = wl12xx_calc_packet_alignment(wl, skb->len);
335
336 if (wl->chip.id == CHIP_ID_1283_PG20) {
337 desc->wl128x_mem.extra_bytes = aligned_len - skb->len;
338 desc->length = cpu_to_le16(aligned_len >> 2);
339
340 wl1271_debug(DEBUG_TX, "tx_fill_hdr: hlid: %d "
341 "tx_attr: 0x%x len: %d life: %d mem: %d",
342 desc->hlid, tx_attr,
343 le16_to_cpu(desc->length),
344 le16_to_cpu(desc->life_time),
345 desc->wl128x_mem.total_mem_blocks);
346 } else {
347 int pad;
348
349 /* Store the aligned length in terms of words */
350 desc->length = cpu_to_le16(aligned_len >> 2);
351
352 /* calculate number of padding bytes */
353 pad = aligned_len - skb->len;
354 tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
355
356 wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d hlid: %d "
357 "tx_attr: 0x%x len: %d life: %d mem: %d", pad,
358 desc->hlid, tx_attr,
359 le16_to_cpu(desc->length),
360 le16_to_cpu(desc->life_time),
361 desc->wl127x_mem.total_mem_blocks);
362 }
363
364 desc->tx_attr = cpu_to_le16(tx_attr);
365 }
366
367 /* caller must hold wl->mutex */
368 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb,
369 u32 buf_offset)
370 {
371 struct ieee80211_tx_info *info;
372 u32 extra = 0;
373 int ret = 0;
374 u32 total_len;
375 u8 hlid;
376
377 if (!skb)
378 return -EINVAL;
379
380 info = IEEE80211_SKB_CB(skb);
381
382 if (info->control.hw_key &&
383 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
384 extra = WL1271_TKIP_IV_SPACE;
385
386 if (info->control.hw_key) {
387 bool is_wep;
388 u8 idx = info->control.hw_key->hw_key_idx;
389 u32 cipher = info->control.hw_key->cipher;
390
391 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
392 (cipher == WLAN_CIPHER_SUITE_WEP104);
393
394 if (unlikely(is_wep && wl->default_key != idx)) {
395 ret = wl1271_set_default_wep_key(wl, idx);
396 if (ret < 0)
397 return ret;
398 wl->default_key = idx;
399 }
400 }
401
402 hlid = wl1271_tx_get_hlid(wl, skb);
403 if (hlid == WL12XX_INVALID_LINK_ID) {
404 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
405 return -EINVAL;
406 }
407
408 ret = wl1271_tx_allocate(wl, skb, extra, buf_offset, hlid);
409 if (ret < 0)
410 return ret;
411
412 wl1271_tx_fill_hdr(wl, skb, extra, info, hlid);
413
414 if (wl->bss_type == BSS_TYPE_AP_BSS) {
415 wl1271_tx_ap_update_inconnection_sta(wl, skb);
416 wl1271_tx_regulate_link(wl, hlid);
417 } else {
418 wl1271_tx_update_filters(wl, skb);
419 }
420
421 /*
422 * The length of each packet is stored in terms of
423 * words. Thus, we must pad the skb data to make sure its
424 * length is aligned. The number of padding bytes is computed
425 * and set in wl1271_tx_fill_hdr.
426 * In special cases, we want to align to a specific block size
427 * (eg. for wl128x with SDIO we align to 256).
428 */
429 total_len = wl12xx_calc_packet_alignment(wl, skb->len);
430
431 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
432 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
433
434 /* Revert side effects in the dummy packet skb, so it can be reused */
435 if (wl12xx_is_dummy_packet(wl, skb))
436 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
437
438 return total_len;
439 }
440
441 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
442 {
443 struct ieee80211_supported_band *band;
444 u32 enabled_rates = 0;
445 int bit;
446
447 band = wl->hw->wiphy->bands[wl->band];
448 for (bit = 0; bit < band->n_bitrates; bit++) {
449 if (rate_set & 0x1)
450 enabled_rates |= band->bitrates[bit].hw_value;
451 rate_set >>= 1;
452 }
453
454 #ifdef CONFIG_WL12XX_HT
455 /* MCS rates indication are on bits 16 - 23 */
456 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
457
458 for (bit = 0; bit < 8; bit++) {
459 if (rate_set & 0x1)
460 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
461 rate_set >>= 1;
462 }
463 #endif
464
465 return enabled_rates;
466 }
467
468 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
469 {
470 unsigned long flags;
471 int i;
472
473 for (i = 0; i < NUM_TX_QUEUES; i++) {
474 if (test_bit(i, &wl->stopped_queues_map) &&
475 wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
476 /* firmware buffer has space, restart queues */
477 spin_lock_irqsave(&wl->wl_lock, flags);
478 ieee80211_wake_queue(wl->hw,
479 wl1271_tx_get_mac80211_queue(i));
480 clear_bit(i, &wl->stopped_queues_map);
481 spin_unlock_irqrestore(&wl->wl_lock, flags);
482 }
483 }
484 }
485
486 static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl,
487 struct sk_buff_head *queues)
488 {
489 int i, q = -1, ac;
490 u32 min_pkts = 0xffffffff;
491
492 /*
493 * Find a non-empty ac where:
494 * 1. There are packets to transmit
495 * 2. The FW has the least allocated blocks
496 *
497 * We prioritize the ACs according to VO>VI>BE>BK
498 */
499 for (i = 0; i < NUM_TX_QUEUES; i++) {
500 ac = wl1271_tx_get_queue(i);
501 if (!skb_queue_empty(&queues[ac]) &&
502 (wl->tx_allocated_pkts[ac] < min_pkts)) {
503 q = ac;
504 min_pkts = wl->tx_allocated_pkts[q];
505 }
506 }
507
508 if (q == -1)
509 return NULL;
510
511 return &queues[q];
512 }
513
514 static struct sk_buff *wl1271_sta_skb_dequeue(struct wl1271 *wl)
515 {
516 struct sk_buff *skb = NULL;
517 unsigned long flags;
518 struct sk_buff_head *queue;
519
520 queue = wl1271_select_queue(wl, wl->tx_queue);
521 if (!queue)
522 goto out;
523
524 skb = skb_dequeue(queue);
525
526 out:
527 if (skb) {
528 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
529 spin_lock_irqsave(&wl->wl_lock, flags);
530 wl->tx_queue_count[q]--;
531 spin_unlock_irqrestore(&wl->wl_lock, flags);
532 }
533
534 return skb;
535 }
536
537 static struct sk_buff *wl1271_ap_skb_dequeue(struct wl1271 *wl)
538 {
539 struct sk_buff *skb = NULL;
540 unsigned long flags;
541 int i, h, start_hlid;
542 struct sk_buff_head *queue;
543
544 /* start from the link after the last one */
545 start_hlid = (wl->last_tx_hlid + 1) % AP_MAX_LINKS;
546
547 /* dequeue according to AC, round robin on each link */
548 for (i = 0; i < AP_MAX_LINKS; i++) {
549 h = (start_hlid + i) % AP_MAX_LINKS;
550
551 /* only consider connected stations */
552 if (h >= WL1271_AP_STA_HLID_START &&
553 !test_bit(h - WL1271_AP_STA_HLID_START, wl->ap_hlid_map))
554 continue;
555
556 queue = wl1271_select_queue(wl, wl->links[h].tx_queue);
557 if (!queue)
558 continue;
559
560 skb = skb_dequeue(queue);
561 if (skb)
562 break;
563 }
564
565 if (skb) {
566 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
567 wl->last_tx_hlid = h;
568 spin_lock_irqsave(&wl->wl_lock, flags);
569 wl->tx_queue_count[q]--;
570 spin_unlock_irqrestore(&wl->wl_lock, flags);
571 } else {
572 wl->last_tx_hlid = 0;
573 }
574
575 return skb;
576 }
577
578 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
579 {
580 unsigned long flags;
581 struct sk_buff *skb = NULL;
582
583 if (wl->bss_type == BSS_TYPE_AP_BSS)
584 skb = wl1271_ap_skb_dequeue(wl);
585 else
586 skb = wl1271_sta_skb_dequeue(wl);
587
588 if (!skb &&
589 test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
590 int q;
591
592 skb = wl->dummy_packet;
593 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
594 spin_lock_irqsave(&wl->wl_lock, flags);
595 wl->tx_queue_count[q]--;
596 spin_unlock_irqrestore(&wl->wl_lock, flags);
597 }
598
599 return skb;
600 }
601
602 static void wl1271_skb_queue_head(struct wl1271 *wl, struct sk_buff *skb)
603 {
604 unsigned long flags;
605 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
606
607 if (wl12xx_is_dummy_packet(wl, skb)) {
608 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
609 } else if (wl->bss_type == BSS_TYPE_AP_BSS) {
610 u8 hlid = wl1271_tx_get_hlid(wl, skb);
611 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
612
613 /* make sure we dequeue the same packet next time */
614 wl->last_tx_hlid = (hlid + AP_MAX_LINKS - 1) % AP_MAX_LINKS;
615 } else {
616 skb_queue_head(&wl->tx_queue[q], skb);
617 }
618
619 spin_lock_irqsave(&wl->wl_lock, flags);
620 wl->tx_queue_count[q]++;
621 spin_unlock_irqrestore(&wl->wl_lock, flags);
622 }
623
624 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
625 {
626 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
627
628 return ieee80211_is_data_present(hdr->frame_control);
629 }
630
631 void wl1271_tx_work_locked(struct wl1271 *wl)
632 {
633 struct sk_buff *skb;
634 u32 buf_offset = 0;
635 bool sent_packets = false;
636 bool had_data = false;
637 bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
638 int ret;
639
640 if (unlikely(wl->state == WL1271_STATE_OFF))
641 return;
642
643 while ((skb = wl1271_skb_dequeue(wl))) {
644 if (wl1271_tx_is_data_present(skb))
645 had_data = true;
646
647 ret = wl1271_prepare_tx_frame(wl, skb, buf_offset);
648 if (ret == -EAGAIN) {
649 /*
650 * Aggregation buffer is full.
651 * Flush buffer and try again.
652 */
653 wl1271_skb_queue_head(wl, skb);
654 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
655 buf_offset, true);
656 sent_packets = true;
657 buf_offset = 0;
658 continue;
659 } else if (ret == -EBUSY) {
660 /*
661 * Firmware buffer is full.
662 * Queue back last skb, and stop aggregating.
663 */
664 wl1271_skb_queue_head(wl, skb);
665 /* No work left, avoid scheduling redundant tx work */
666 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
667 goto out_ack;
668 } else if (ret < 0) {
669 dev_kfree_skb(skb);
670 goto out_ack;
671 }
672 buf_offset += ret;
673 wl->tx_packets_count++;
674 }
675
676 out_ack:
677 if (buf_offset) {
678 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
679 buf_offset, true);
680 sent_packets = true;
681 }
682 if (sent_packets) {
683 /*
684 * Interrupt the firmware with the new packets. This is only
685 * required for older hardware revisions
686 */
687 if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
688 wl1271_write32(wl, WL1271_HOST_WR_ACCESS,
689 wl->tx_packets_count);
690
691 wl1271_handle_tx_low_watermark(wl);
692 }
693 if (!is_ap && wl->conf.rx_streaming.interval && had_data &&
694 (wl->conf.rx_streaming.always ||
695 test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))) {
696 u32 timeout = wl->conf.rx_streaming.duration;
697
698 /* enable rx streaming */
699 if (!test_bit(WL1271_FLAG_RX_STREAMING_STARTED, &wl->flags))
700 ieee80211_queue_work(wl->hw,
701 &wl->rx_streaming_enable_work);
702
703 mod_timer(&wl->rx_streaming_timer,
704 jiffies + msecs_to_jiffies(timeout));
705 }
706 }
707
708 void wl1271_tx_work(struct work_struct *work)
709 {
710 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
711 int ret;
712
713 mutex_lock(&wl->mutex);
714 ret = wl1271_ps_elp_wakeup(wl);
715 if (ret < 0)
716 goto out;
717
718 wl1271_tx_work_locked(wl);
719
720 wl1271_ps_elp_sleep(wl);
721 out:
722 mutex_unlock(&wl->mutex);
723 }
724
725 static void wl1271_tx_complete_packet(struct wl1271 *wl,
726 struct wl1271_tx_hw_res_descr *result)
727 {
728 struct ieee80211_tx_info *info;
729 struct sk_buff *skb;
730 int id = result->id;
731 int rate = -1;
732 u8 retries = 0;
733
734 /* check for id legality */
735 if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
736 wl1271_warning("TX result illegal id: %d", id);
737 return;
738 }
739
740 skb = wl->tx_frames[id];
741 info = IEEE80211_SKB_CB(skb);
742
743 if (wl12xx_is_dummy_packet(wl, skb)) {
744 wl1271_free_tx_id(wl, id);
745 return;
746 }
747
748 /* update the TX status info */
749 if (result->status == TX_SUCCESS) {
750 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
751 info->flags |= IEEE80211_TX_STAT_ACK;
752 rate = wl1271_rate_to_idx(result->rate_class_index, wl->band);
753 retries = result->ack_failures;
754 } else if (result->status == TX_RETRY_EXCEEDED) {
755 wl->stats.excessive_retries++;
756 retries = result->ack_failures;
757 }
758
759 info->status.rates[0].idx = rate;
760 info->status.rates[0].count = retries;
761 info->status.rates[0].flags = 0;
762 info->status.ack_signal = -1;
763
764 wl->stats.retry_count += result->ack_failures;
765
766 /*
767 * update sequence number only when relevant, i.e. only in
768 * sessions of TKIP, AES and GEM (not in open or WEP sessions)
769 */
770 if (info->control.hw_key &&
771 (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
772 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
773 info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
774 u8 fw_lsb = result->tx_security_sequence_number_lsb;
775 u8 cur_lsb = wl->tx_security_last_seq_lsb;
776
777 /*
778 * update security sequence number, taking care of potential
779 * wrap-around
780 */
781 wl->tx_security_seq += (fw_lsb - cur_lsb + 256) % 256;
782 wl->tx_security_last_seq_lsb = fw_lsb;
783 }
784
785 /* remove private header from packet */
786 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
787
788 /* remove TKIP header space if present */
789 if (info->control.hw_key &&
790 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
791 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
792 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
793 skb_pull(skb, WL1271_TKIP_IV_SPACE);
794 }
795
796 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
797 " status 0x%x",
798 result->id, skb, result->ack_failures,
799 result->rate_class_index, result->status);
800
801 /* return the packet to the stack */
802 skb_queue_tail(&wl->deferred_tx_queue, skb);
803 queue_work(wl->freezable_wq, &wl->netstack_work);
804 wl1271_free_tx_id(wl, result->id);
805 }
806
807 /* Called upon reception of a TX complete interrupt */
808 void wl1271_tx_complete(struct wl1271 *wl)
809 {
810 struct wl1271_acx_mem_map *memmap =
811 (struct wl1271_acx_mem_map *)wl->target_mem_map;
812 u32 count, fw_counter;
813 u32 i;
814
815 /* read the tx results from the chipset */
816 wl1271_read(wl, le32_to_cpu(memmap->tx_result),
817 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
818 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
819
820 /* write host counter to chipset (to ack) */
821 wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
822 offsetof(struct wl1271_tx_hw_res_if,
823 tx_result_host_counter), fw_counter);
824
825 count = fw_counter - wl->tx_results_count;
826 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
827
828 /* verify that the result buffer is not getting overrun */
829 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
830 wl1271_warning("TX result overflow from chipset: %d", count);
831
832 /* process the results */
833 for (i = 0; i < count; i++) {
834 struct wl1271_tx_hw_res_descr *result;
835 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
836
837 /* process the packet */
838 result = &(wl->tx_res_if->tx_results_queue[offset]);
839 wl1271_tx_complete_packet(wl, result);
840
841 wl->tx_results_count++;
842 }
843 }
844
845 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
846 {
847 struct sk_buff *skb;
848 int i;
849 unsigned long flags;
850 struct ieee80211_tx_info *info;
851 int total[NUM_TX_QUEUES];
852
853 for (i = 0; i < NUM_TX_QUEUES; i++) {
854 total[i] = 0;
855 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
856 wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
857
858 if (!wl12xx_is_dummy_packet(wl, skb)) {
859 info = IEEE80211_SKB_CB(skb);
860 info->status.rates[0].idx = -1;
861 info->status.rates[0].count = 0;
862 ieee80211_tx_status_ni(wl->hw, skb);
863 }
864
865 total[i]++;
866 }
867 }
868
869 spin_lock_irqsave(&wl->wl_lock, flags);
870 for (i = 0; i < NUM_TX_QUEUES; i++)
871 wl->tx_queue_count[i] -= total[i];
872 spin_unlock_irqrestore(&wl->wl_lock, flags);
873
874 wl1271_handle_tx_low_watermark(wl);
875 }
876
877 /* caller must hold wl->mutex and TX must be stopped */
878 void wl1271_tx_reset(struct wl1271 *wl, bool reset_tx_queues)
879 {
880 int i;
881 struct sk_buff *skb;
882 struct ieee80211_tx_info *info;
883
884 /* TX failure */
885 if (wl->bss_type == BSS_TYPE_AP_BSS) {
886 for (i = 0; i < AP_MAX_LINKS; i++) {
887 wl1271_tx_reset_link_queues(wl, i);
888 wl->links[i].allocated_pkts = 0;
889 wl->links[i].prev_freed_pkts = 0;
890 }
891
892 wl->last_tx_hlid = 0;
893 } else {
894 for (i = 0; i < NUM_TX_QUEUES; i++) {
895 while ((skb = skb_dequeue(&wl->tx_queue[i]))) {
896 wl1271_debug(DEBUG_TX, "freeing skb 0x%p",
897 skb);
898
899 if (!wl12xx_is_dummy_packet(wl, skb)) {
900 info = IEEE80211_SKB_CB(skb);
901 info->status.rates[0].idx = -1;
902 info->status.rates[0].count = 0;
903 ieee80211_tx_status_ni(wl->hw, skb);
904 }
905 }
906 wl->tx_queue_count[i] = 0;
907 }
908 }
909
910 wl->stopped_queues_map = 0;
911
912 /*
913 * Make sure the driver is at a consistent state, in case this
914 * function is called from a context other than interface removal.
915 * This call will always wake the TX queues.
916 */
917 if (reset_tx_queues)
918 wl1271_handle_tx_low_watermark(wl);
919
920 for (i = 0; i < ACX_TX_DESCRIPTORS; i++) {
921 if (wl->tx_frames[i] == NULL)
922 continue;
923
924 skb = wl->tx_frames[i];
925 wl1271_free_tx_id(wl, i);
926 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
927
928 if (!wl12xx_is_dummy_packet(wl, skb)) {
929 /*
930 * Remove private headers before passing the skb to
931 * mac80211
932 */
933 info = IEEE80211_SKB_CB(skb);
934 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
935 if (info->control.hw_key &&
936 info->control.hw_key->cipher ==
937 WLAN_CIPHER_SUITE_TKIP) {
938 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
939 memmove(skb->data + WL1271_TKIP_IV_SPACE,
940 skb->data, hdrlen);
941 skb_pull(skb, WL1271_TKIP_IV_SPACE);
942 }
943
944 info->status.rates[0].idx = -1;
945 info->status.rates[0].count = 0;
946
947 ieee80211_tx_status_ni(wl->hw, skb);
948 }
949 }
950 }
951
952 #define WL1271_TX_FLUSH_TIMEOUT 500000
953
954 /* caller must *NOT* hold wl->mutex */
955 void wl1271_tx_flush(struct wl1271 *wl)
956 {
957 unsigned long timeout;
958 timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
959
960 while (!time_after(jiffies, timeout)) {
961 mutex_lock(&wl->mutex);
962 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
963 wl->tx_frames_cnt,
964 wl1271_tx_total_queue_count(wl));
965 if ((wl->tx_frames_cnt == 0) &&
966 (wl1271_tx_total_queue_count(wl) == 0)) {
967 mutex_unlock(&wl->mutex);
968 return;
969 }
970 mutex_unlock(&wl->mutex);
971 msleep(1);
972 }
973
974 wl1271_warning("Unable to flush all TX buffers, timed out.");
975 }
976
977 u32 wl1271_tx_min_rate_get(struct wl1271 *wl)
978 {
979 int i;
980 u32 rate = 0;
981
982 if (!wl->basic_rate_set) {
983 WARN_ON(1);
984 wl->basic_rate_set = wl->conf.tx.basic_rate;
985 }
986
987 for (i = 0; !rate; i++) {
988 if ((wl->basic_rate_set >> i) & 0x1)
989 rate = 1 << i;
990 }
991
992 return rate;
993 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree