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ocfs2: Make the left masklogs compat.
[taoma-kernel.git] / drivers / net / wireless / wl12xx / tx.c
blobb44c75cd8c1e714d8e4f2cf83c8099475fca795b
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
27 #include "wl12xx.h"
28 #include "io.h"
29 #include "reg.h"
30 #include "ps.h"
31 #include "tx.h"
32
33 static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
34 {
35 int id;
36
37 id = find_first_zero_bit(wl->tx_frames_map, ACX_TX_DESCRIPTORS);
38 if (id >= ACX_TX_DESCRIPTORS)
39 return -EBUSY;
40
41 __set_bit(id, wl->tx_frames_map);
42 wl->tx_frames[id] = skb;
43 wl->tx_frames_cnt++;
44 return id;
45 }
46
47 static void wl1271_free_tx_id(struct wl1271 *wl, int id)
48 {
49 if (__test_and_clear_bit(id, wl->tx_frames_map)) {
50 wl->tx_frames[id] = NULL;
51 wl->tx_frames_cnt--;
52 }
53 }
54
55 static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra,
56 u32 buf_offset)
57 {
58 struct wl1271_tx_hw_descr *desc;
59 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
60 u32 total_blocks;
61 int id, ret = -EBUSY;
62
63 if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
64 return -EAGAIN;
65
66 /* allocate free identifier for the packet */
67 id = wl1271_alloc_tx_id(wl, skb);
68 if (id < 0)
69 return id;
70
71 /* approximate the number of blocks required for this packet
72 in the firmware */
73 total_blocks = total_len + TX_HW_BLOCK_SIZE - 1;
74 total_blocks = total_blocks / TX_HW_BLOCK_SIZE + TX_HW_BLOCK_SPARE;
75 if (total_blocks <= wl->tx_blocks_available) {
76 desc = (struct wl1271_tx_hw_descr *)skb_push(
77 skb, total_len - skb->len);
78
79 desc->extra_mem_blocks = TX_HW_BLOCK_SPARE;
80 desc->total_mem_blocks = total_blocks;
81 desc->id = id;
82
83 wl->tx_blocks_available -= total_blocks;
84
85 ret = 0;
86
87 wl1271_debug(DEBUG_TX,
88 "tx_allocate: size: %d, blocks: %d, id: %d",
89 total_len, total_blocks, id);
90 } else {
91 wl1271_free_tx_id(wl, id);
92 }
93
94 return ret;
95 }
96
97 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
98 u32 extra, struct ieee80211_tx_info *control)
99 {
100 struct timespec ts;
101 struct wl1271_tx_hw_descr *desc;
102 int pad, ac;
103 s64 hosttime;
104 u16 tx_attr;
105
106 desc = (struct wl1271_tx_hw_descr *) skb->data;
107
108 /* relocate space for security header */
109 if (extra) {
110 void *framestart = skb->data + sizeof(*desc);
111 u16 fc = *(u16 *)(framestart + extra);
112 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
113 memmove(framestart, framestart + extra, hdrlen);
114 }
115
116 /* configure packet life time */
117 getnstimeofday(&ts);
118 hosttime = (timespec_to_ns(&ts) >> 10);
119 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
120 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
121
122 /* configure the tx attributes */
123 tx_attr = wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
124
125 /* queue (we use same identifiers for tid's and ac's */
126 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
127 desc->tid = ac;
128 desc->aid = TX_HW_DEFAULT_AID;
129 desc->reserved = 0;
130
131 /* align the length (and store in terms of words) */
132 pad = WL1271_TX_ALIGN(skb->len);
133 desc->length = cpu_to_le16(pad >> 2);
134
135 /* calculate number of padding bytes */
136 pad = pad - skb->len;
137 tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
138
139 /* if the packets are destined for AP (have a STA entry) send them
140 with AP rate policies, otherwise use default basic rates */
141 if (control->control.sta)
142 tx_attr |= ACX_TX_AP_FULL_RATE << TX_HW_ATTR_OFST_RATE_POLICY;
143
144 desc->tx_attr = cpu_to_le16(tx_attr);
145
146 wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d", pad);
147 }
148
149 /* caller must hold wl->mutex */
150 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb,
151 u32 buf_offset)
152 {
153 struct ieee80211_tx_info *info;
154 u32 extra = 0;
155 int ret = 0;
156 u8 idx;
157 u32 total_len;
158
159 if (!skb)
160 return -EINVAL;
161
162 info = IEEE80211_SKB_CB(skb);
163
164 if (info->control.hw_key &&
165 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
166 extra = WL1271_TKIP_IV_SPACE;
167
168 if (info->control.hw_key) {
169 idx = info->control.hw_key->hw_key_idx;
170
171 /* FIXME: do we have to do this if we're not using WEP? */
172 if (unlikely(wl->default_key != idx)) {
173 ret = wl1271_cmd_set_default_wep_key(wl, idx);
174 if (ret < 0)
175 return ret;
176 wl->default_key = idx;
177 }
178 }
179
180 ret = wl1271_tx_allocate(wl, skb, extra, buf_offset);
181 if (ret < 0)
182 return ret;
183
184 wl1271_tx_fill_hdr(wl, skb, extra, info);
185
186 /*
187 * The length of each packet is stored in terms of words. Thus, we must
188 * pad the skb data to make sure its length is aligned.
189 * The number of padding bytes is computed and set in wl1271_tx_fill_hdr
190 */
191 total_len = WL1271_TX_ALIGN(skb->len);
192 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
193 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
194
195 return total_len;
196 }
197
198 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
199 {
200 struct ieee80211_supported_band *band;
201 u32 enabled_rates = 0;
202 int bit;
203
204 band = wl->hw->wiphy->bands[wl->band];
205 for (bit = 0; bit < band->n_bitrates; bit++) {
206 if (rate_set & 0x1)
207 enabled_rates |= band->bitrates[bit].hw_value;
208 rate_set >>= 1;
209 }
210
211 #ifdef CONFIG_WL12XX_HT
212 /* MCS rates indication are on bits 16 - 23 */
213 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
214
215 for (bit = 0; bit < 8; bit++) {
216 if (rate_set & 0x1)
217 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
218 rate_set >>= 1;
219 }
220 #endif
221
222 return enabled_rates;
223 }
224
225 static void handle_tx_low_watermark(struct wl1271 *wl)
226 {
227 unsigned long flags;
228
229 if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
230 wl->tx_queue_count <= WL1271_TX_QUEUE_LOW_WATERMARK) {
231 /* firmware buffer has space, restart queues */
232 spin_lock_irqsave(&wl->wl_lock, flags);
233 ieee80211_wake_queues(wl->hw);
234 clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
235 spin_unlock_irqrestore(&wl->wl_lock, flags);
236 }
237 }
238
239 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
240 {
241 struct sk_buff *skb = NULL;
242 unsigned long flags;
243
244 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VO]);
245 if (skb)
246 goto out;
247 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VI]);
248 if (skb)
249 goto out;
250 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BE]);
251 if (skb)
252 goto out;
253 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BK]);
254
255 out:
256 if (skb) {
257 spin_lock_irqsave(&wl->wl_lock, flags);
258 wl->tx_queue_count--;
259 spin_unlock_irqrestore(&wl->wl_lock, flags);
260 }
261
262 return skb;
263 }
264
265 static void wl1271_skb_queue_head(struct wl1271 *wl, struct sk_buff *skb)
266 {
267 unsigned long flags;
268 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
269
270 skb_queue_head(&wl->tx_queue[q], skb);
271 spin_lock_irqsave(&wl->wl_lock, flags);
272 wl->tx_queue_count++;
273 spin_unlock_irqrestore(&wl->wl_lock, flags);
274 }
275
276 void wl1271_tx_work_locked(struct wl1271 *wl)
277 {
278 struct sk_buff *skb;
279 bool woken_up = false;
280 u32 sta_rates = 0;
281 u32 buf_offset = 0;
282 bool sent_packets = false;
283 int ret;
284
285 /* check if the rates supported by the AP have changed */
286 if (unlikely(test_and_clear_bit(WL1271_FLAG_STA_RATES_CHANGED,
287 &wl->flags))) {
288 unsigned long flags;
289
290 spin_lock_irqsave(&wl->wl_lock, flags);
291 sta_rates = wl->sta_rate_set;
292 spin_unlock_irqrestore(&wl->wl_lock, flags);
293 }
294
295 if (unlikely(wl->state == WL1271_STATE_OFF))
296 goto out;
297
298 /* if rates have changed, re-configure the rate policy */
299 if (unlikely(sta_rates)) {
300 ret = wl1271_ps_elp_wakeup(wl, false);
301 if (ret < 0)
302 goto out;
303 woken_up = true;
304
305 wl->rate_set = wl1271_tx_enabled_rates_get(wl, sta_rates);
306 wl1271_acx_rate_policies(wl);
307 }
308
309 while ((skb = wl1271_skb_dequeue(wl))) {
310 if (!woken_up) {
311 ret = wl1271_ps_elp_wakeup(wl, false);
312 if (ret < 0)
313 goto out_ack;
314 woken_up = true;
315 }
316
317 ret = wl1271_prepare_tx_frame(wl, skb, buf_offset);
318 if (ret == -EAGAIN) {
319 /*
320 * Aggregation buffer is full.
321 * Flush buffer and try again.
322 */
323 wl1271_skb_queue_head(wl, skb);
324 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
325 buf_offset, true);
326 sent_packets = true;
327 buf_offset = 0;
328 continue;
329 } else if (ret == -EBUSY) {
330 /*
331 * Firmware buffer is full.
332 * Queue back last skb, and stop aggregating.
333 */
334 wl1271_skb_queue_head(wl, skb);
335 /* No work left, avoid scheduling redundant tx work */
336 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
337 goto out_ack;
338 } else if (ret < 0) {
339 dev_kfree_skb(skb);
340 goto out_ack;
341 }
342 buf_offset += ret;
343 wl->tx_packets_count++;
344 }
345
346 out_ack:
347 if (buf_offset) {
348 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
349 buf_offset, true);
350 sent_packets = true;
351 }
352 if (sent_packets) {
353 /* interrupt the firmware with the new packets */
354 wl1271_write32(wl, WL1271_HOST_WR_ACCESS, wl->tx_packets_count);
355 handle_tx_low_watermark(wl);
356 }
357
358 out:
359 if (woken_up)
360 wl1271_ps_elp_sleep(wl);
361 }
362
363 void wl1271_tx_work(struct work_struct *work)
364 {
365 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
366
367 mutex_lock(&wl->mutex);
368 wl1271_tx_work_locked(wl);
369 mutex_unlock(&wl->mutex);
370 }
371
372 static void wl1271_tx_complete_packet(struct wl1271 *wl,
373 struct wl1271_tx_hw_res_descr *result)
374 {
375 struct ieee80211_tx_info *info;
376 struct sk_buff *skb;
377 int id = result->id;
378 int rate = -1;
379 u8 retries = 0;
380
381 /* check for id legality */
382 if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
383 wl1271_warning("TX result illegal id: %d", id);
384 return;
385 }
386
387 skb = wl->tx_frames[id];
388 info = IEEE80211_SKB_CB(skb);
389
390 /* update the TX status info */
391 if (result->status == TX_SUCCESS) {
392 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
393 info->flags |= IEEE80211_TX_STAT_ACK;
394 rate = wl1271_rate_to_idx(result->rate_class_index, wl->band);
395 retries = result->ack_failures;
396 } else if (result->status == TX_RETRY_EXCEEDED) {
397 wl->stats.excessive_retries++;
398 retries = result->ack_failures;
399 }
400
401 info->status.rates[0].idx = rate;
402 info->status.rates[0].count = retries;
403 info->status.rates[0].flags = 0;
404 info->status.ack_signal = -1;
405
406 wl->stats.retry_count += result->ack_failures;
407
408 /* update security sequence number */
409 wl->tx_security_seq += (result->lsb_security_sequence_number -
410 wl->tx_security_last_seq);
411 wl->tx_security_last_seq = result->lsb_security_sequence_number;
412
413 /* remove private header from packet */
414 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
415
416 /* remove TKIP header space if present */
417 if (info->control.hw_key &&
418 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
419 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
420 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
421 skb_pull(skb, WL1271_TKIP_IV_SPACE);
422 }
423
424 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
425 " status 0x%x",
426 result->id, skb, result->ack_failures,
427 result->rate_class_index, result->status);
428
429 /* return the packet to the stack */
430 ieee80211_tx_status(wl->hw, skb);
431 wl1271_free_tx_id(wl, result->id);
432 }
433
434 /* Called upon reception of a TX complete interrupt */
435 void wl1271_tx_complete(struct wl1271 *wl)
436 {
437 struct wl1271_acx_mem_map *memmap =
438 (struct wl1271_acx_mem_map *)wl->target_mem_map;
439 u32 count, fw_counter;
440 u32 i;
441
442 /* read the tx results from the chipset */
443 wl1271_read(wl, le32_to_cpu(memmap->tx_result),
444 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
445 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
446
447 /* write host counter to chipset (to ack) */
448 wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
449 offsetof(struct wl1271_tx_hw_res_if,
450 tx_result_host_counter), fw_counter);
451
452 count = fw_counter - wl->tx_results_count;
453 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
454
455 /* verify that the result buffer is not getting overrun */
456 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
457 wl1271_warning("TX result overflow from chipset: %d", count);
458
459 /* process the results */
460 for (i = 0; i < count; i++) {
461 struct wl1271_tx_hw_res_descr *result;
462 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
463
464 /* process the packet */
465 result = &(wl->tx_res_if->tx_results_queue[offset]);
466 wl1271_tx_complete_packet(wl, result);
467
468 wl->tx_results_count++;
469 }
470 }
471
472 /* caller must hold wl->mutex */
473 void wl1271_tx_reset(struct wl1271 *wl)
474 {
475 int i;
476 struct sk_buff *skb;
477
478 /* TX failure */
479 for (i = 0; i < NUM_TX_QUEUES; i++) {
480 while ((skb = skb_dequeue(&wl->tx_queue[i]))) {
481 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
482 ieee80211_tx_status(wl->hw, skb);
483 }
484 }
485 wl->tx_queue_count = 0;
486
487 /*
488 * Make sure the driver is at a consistent state, in case this
489 * function is called from a context other than interface removal.
490 */
491 handle_tx_low_watermark(wl);
492
493 for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
494 if (wl->tx_frames[i] != NULL) {
495 skb = wl->tx_frames[i];
496 wl1271_free_tx_id(wl, i);
497 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
498 ieee80211_tx_status(wl->hw, skb);
499 }
500 }
501
502 #define WL1271_TX_FLUSH_TIMEOUT 500000
503
504 /* caller must *NOT* hold wl->mutex */
505 void wl1271_tx_flush(struct wl1271 *wl)
506 {
507 unsigned long timeout;
508 timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
509
510 while (!time_after(jiffies, timeout)) {
511 mutex_lock(&wl->mutex);
512 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d",
513 wl->tx_frames_cnt);
514 if ((wl->tx_frames_cnt == 0) && (wl->tx_queue_count == 0)) {
515 mutex_unlock(&wl->mutex);
516 return;
517 }
518 mutex_unlock(&wl->mutex);
519 msleep(1);
520 }
521
522 wl1271_warning("Unable to flush all TX buffers, timed out.");
523 }
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