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path: root/drivers/net/wireless/wl12xx/wl1271_tx.c
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Diffstat (limited to 'drivers/net/wireless/wl12xx/wl1271_tx.c')
-rw-r--r--drivers/net/wireless/wl12xx/wl1271_tx.c464
1 files changed, 0 insertions, 464 deletions
diff --git a/drivers/net/wireless/wl12xx/wl1271_tx.c b/drivers/net/wireless/wl12xx/wl1271_tx.c
deleted file mode 100644
index c592cc2e9fe8..000000000000
--- a/drivers/net/wireless/wl12xx/wl1271_tx.c
+++ /dev/null
@@ -1,464 +0,0 @@
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 "wl1271.h"
28#include "wl1271_io.h"
29#include "wl1271_reg.h"
30#include "wl1271_ps.h"
31#include "wl1271_tx.h"
32
33static int wl1271_tx_id(struct wl1271 *wl, struct sk_buff *skb)
34{
35 int i;
36 for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
37 if (wl->tx_frames[i] == NULL) {
38 wl->tx_frames[i] = skb;
39 wl->tx_frames_cnt++;
40 return i;
41 }
42
43 return -EBUSY;
44}
45
46static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra)
47{
48 struct wl1271_tx_hw_descr *desc;
49 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
50 u32 total_blocks;
51 int id, ret = -EBUSY;
52
53 /* allocate free identifier for the packet */
54 id = wl1271_tx_id(wl, skb);
55 if (id < 0)
56 return id;
57
58 /* approximate the number of blocks required for this packet
59 in the firmware */
60 total_blocks = total_len + TX_HW_BLOCK_SIZE - 1;
61 total_blocks = total_blocks / TX_HW_BLOCK_SIZE + TX_HW_BLOCK_SPARE;
62 if (total_blocks <= wl->tx_blocks_available) {
63 desc = (struct wl1271_tx_hw_descr *)skb_push(
64 skb, total_len - skb->len);
65
66 desc->extra_mem_blocks = TX_HW_BLOCK_SPARE;
67 desc->total_mem_blocks = total_blocks;
68 desc->id = id;
69
70 wl->tx_blocks_available -= total_blocks;
71
72 ret = 0;
73
74 wl1271_debug(DEBUG_TX,
75 "tx_allocate: size: %d, blocks: %d, id: %d",
76 total_len, total_blocks, id);
77 } else {
78 wl->tx_frames[id] = NULL;
79 wl->tx_frames_cnt--;
80 }
81
82 return ret;
83}
84
85static int wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
86 u32 extra, struct ieee80211_tx_info *control)
87{
88 struct timespec ts;
89 struct wl1271_tx_hw_descr *desc;
90 int pad, ac;
91 s64 hosttime;
92 u16 tx_attr;
93
94 desc = (struct wl1271_tx_hw_descr *) skb->data;
95
96 /* relocate space for security header */
97 if (extra) {
98 void *framestart = skb->data + sizeof(*desc);
99 u16 fc = *(u16 *)(framestart + extra);
100 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
101 memmove(framestart, framestart + extra, hdrlen);
102 }
103
104 /* configure packet life time */
105 getnstimeofday(&ts);
106 hosttime = (timespec_to_ns(&ts) >> 10);
107 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
108 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
109
110 /* configure the tx attributes */
111 tx_attr = wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
112
113 /* queue */
114 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
115 desc->tid = wl1271_tx_ac_to_tid(ac);
116
117 desc->aid = TX_HW_DEFAULT_AID;
118 desc->reserved = 0;
119
120 /* align the length (and store in terms of words) */
121 pad = WL1271_TX_ALIGN(skb->len);
122 desc->length = cpu_to_le16(pad >> 2);
123
124 /* calculate number of padding bytes */
125 pad = pad - skb->len;
126 tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
127
128 /* if the packets are destined for AP (have a STA entry) send them
129 with AP rate policies, otherwise use default basic rates */
130 if (control->control.sta)
131 tx_attr |= ACX_TX_AP_FULL_RATE << TX_HW_ATTR_OFST_RATE_POLICY;
132
133 desc->tx_attr = cpu_to_le16(tx_attr);
134
135 wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d", pad);
136 return 0;
137}
138
139static int wl1271_tx_send_packet(struct wl1271 *wl, struct sk_buff *skb,
140 struct ieee80211_tx_info *control)
141{
142
143 struct wl1271_tx_hw_descr *desc;
144 int len;
145
146 /* FIXME: This is a workaround for getting non-aligned packets.
147 This happens at least with EAPOL packets from the user space.
148 Our DMA requires packets to be aligned on a 4-byte boundary.
149 */
150 if (unlikely((long)skb->data & 0x03)) {
151 int offset = (4 - (long)skb->data) & 0x03;
152 wl1271_debug(DEBUG_TX, "skb offset %d", offset);
153
154 /* check whether the current skb can be used */
155 if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
156 unsigned char *src = skb->data;
157
158 /* align the buffer on a 4-byte boundary */
159 skb_reserve(skb, offset);
160 memmove(skb->data, src, skb->len);
161 } else {
162 wl1271_info("No handler, fixme!");
163 return -EINVAL;
164 }
165 }
166
167 len = WL1271_TX_ALIGN(skb->len);
168
169 /* perform a fixed address block write with the packet */
170 wl1271_write(wl, WL1271_SLV_MEM_DATA, skb->data, len, true);
171
172 /* write packet new counter into the write access register */
173 wl->tx_packets_count++;
174
175 desc = (struct wl1271_tx_hw_descr *) skb->data;
176 wl1271_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u (%u words)",
177 desc->id, skb, len, desc->length);
178
179 return 0;
180}
181
182/* caller must hold wl->mutex */
183static int wl1271_tx_frame(struct wl1271 *wl, struct sk_buff *skb)
184{
185 struct ieee80211_tx_info *info;
186 u32 extra = 0;
187 int ret = 0;
188 u8 idx;
189
190 if (!skb)
191 return -EINVAL;
192
193 info = IEEE80211_SKB_CB(skb);
194
195 if (info->control.hw_key &&
196 info->control.hw_key->alg == ALG_TKIP)
197 extra = WL1271_TKIP_IV_SPACE;
198
199 if (info->control.hw_key) {
200 idx = info->control.hw_key->hw_key_idx;
201
202 /* FIXME: do we have to do this if we're not using WEP? */
203 if (unlikely(wl->default_key != idx)) {
204 ret = wl1271_cmd_set_default_wep_key(wl, idx);
205 if (ret < 0)
206 return ret;
207 wl->default_key = idx;
208 }
209 }
210
211 ret = wl1271_tx_allocate(wl, skb, extra);
212 if (ret < 0)
213 return ret;
214
215 ret = wl1271_tx_fill_hdr(wl, skb, extra, info);
216 if (ret < 0)
217 return ret;
218
219 ret = wl1271_tx_send_packet(wl, skb, info);
220 if (ret < 0)
221 return ret;
222
223 return ret;
224}
225
226u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
227{
228 struct ieee80211_supported_band *band;
229 u32 enabled_rates = 0;
230 int bit;
231
232 band = wl->hw->wiphy->bands[wl->band];
233 for (bit = 0; bit < band->n_bitrates; bit++) {
234 if (rate_set & 0x1)
235 enabled_rates |= band->bitrates[bit].hw_value;
236 rate_set >>= 1;
237 }
238
239 return enabled_rates;
240}
241
242void wl1271_tx_work(struct work_struct *work)
243{
244 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
245 struct sk_buff *skb;
246 bool woken_up = false;
247 u32 sta_rates = 0;
248 u32 prev_tx_packets_count;
249 int ret;
250
251 /* check if the rates supported by the AP have changed */
252 if (unlikely(test_and_clear_bit(WL1271_FLAG_STA_RATES_CHANGED,
253 &wl->flags))) {
254 unsigned long flags;
255 spin_lock_irqsave(&wl->wl_lock, flags);
256 sta_rates = wl->sta_rate_set;
257 spin_unlock_irqrestore(&wl->wl_lock, flags);
258 }
259
260 mutex_lock(&wl->mutex);
261
262 if (unlikely(wl->state == WL1271_STATE_OFF))
263 goto out;
264
265 prev_tx_packets_count = wl->tx_packets_count;
266
267 /* if rates have changed, re-configure the rate policy */
268 if (unlikely(sta_rates)) {
269 wl->rate_set = wl1271_tx_enabled_rates_get(wl, sta_rates);
270 wl1271_acx_rate_policies(wl);
271 }
272
273 while ((skb = skb_dequeue(&wl->tx_queue))) {
274 if (!woken_up) {
275 ret = wl1271_ps_elp_wakeup(wl, false);
276 if (ret < 0)
277 goto out_ack;
278 woken_up = true;
279 }
280
281 ret = wl1271_tx_frame(wl, skb);
282 if (ret == -EBUSY) {
283 /* firmware buffer is full, lets stop transmitting. */
284 skb_queue_head(&wl->tx_queue, skb);
285 goto out_ack;
286 } else if (ret < 0) {
287 dev_kfree_skb(skb);
288 goto out_ack;
289 }
290 }
291
292out_ack:
293 /* interrupt the firmware with the new packets */
294 if (prev_tx_packets_count != wl->tx_packets_count)
295 wl1271_write32(wl, WL1271_HOST_WR_ACCESS, wl->tx_packets_count);
296
297out:
298 if (woken_up)
299 wl1271_ps_elp_sleep(wl);
300
301 mutex_unlock(&wl->mutex);
302}
303
304static void wl1271_tx_complete_packet(struct wl1271 *wl,
305 struct wl1271_tx_hw_res_descr *result)
306{
307 struct ieee80211_tx_info *info;
308 struct sk_buff *skb;
309 int id = result->id;
310 int rate = -1;
311 u8 retries = 0;
312
313 /* check for id legality */
314 if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
315 wl1271_warning("TX result illegal id: %d", id);
316 return;
317 }
318
319 skb = wl->tx_frames[id];
320 info = IEEE80211_SKB_CB(skb);
321
322 /* update the TX status info */
323 if (result->status == TX_SUCCESS) {
324 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
325 info->flags |= IEEE80211_TX_STAT_ACK;
326 rate = wl1271_rate_to_idx(wl, result->rate_class_index);
327 retries = result->ack_failures;
328 } else if (result->status == TX_RETRY_EXCEEDED) {
329 wl->stats.excessive_retries++;
330 retries = result->ack_failures;
331 }
332
333 info->status.rates[0].idx = rate;
334 info->status.rates[0].count = retries;
335 info->status.rates[0].flags = 0;
336 info->status.ack_signal = -1;
337
338 wl->stats.retry_count += result->ack_failures;
339
340 /* update security sequence number */
341 wl->tx_security_seq += (result->lsb_security_sequence_number -
342 wl->tx_security_last_seq);
343 wl->tx_security_last_seq = result->lsb_security_sequence_number;
344
345 /* remove private header from packet */
346 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
347
348 /* remove TKIP header space if present */
349 if (info->control.hw_key &&
350 info->control.hw_key->alg == ALG_TKIP) {
351 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
352 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
353 skb_pull(skb, WL1271_TKIP_IV_SPACE);
354 }
355
356 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
357 " status 0x%x",
358 result->id, skb, result->ack_failures,
359 result->rate_class_index, result->status);
360
361 /* return the packet to the stack */
362 ieee80211_tx_status(wl->hw, skb);
363 wl->tx_frames[result->id] = NULL;
364 wl->tx_frames_cnt--;
365}
366
367/* Called upon reception of a TX complete interrupt */
368void wl1271_tx_complete(struct wl1271 *wl)
369{
370 struct wl1271_acx_mem_map *memmap =
371 (struct wl1271_acx_mem_map *)wl->target_mem_map;
372 u32 count, fw_counter;
373 u32 i;
374
375 /* read the tx results from the chipset */
376 wl1271_read(wl, le32_to_cpu(memmap->tx_result),
377 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
378 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
379
380 /* write host counter to chipset (to ack) */
381 wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
382 offsetof(struct wl1271_tx_hw_res_if,
383 tx_result_host_counter), fw_counter);
384
385 count = fw_counter - wl->tx_results_count;
386 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
387
388 /* verify that the result buffer is not getting overrun */
389 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
390 wl1271_warning("TX result overflow from chipset: %d", count);
391
392 /* process the results */
393 for (i = 0; i < count; i++) {
394 struct wl1271_tx_hw_res_descr *result;
395 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
396
397 /* process the packet */
398 result = &(wl->tx_res_if->tx_results_queue[offset]);
399 wl1271_tx_complete_packet(wl, result);
400
401 wl->tx_results_count++;
402 }
403
404 if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
405 skb_queue_len(&wl->tx_queue) <= WL1271_TX_QUEUE_LOW_WATERMARK) {
406 unsigned long flags;
407
408 /* firmware buffer has space, restart queues */
409 wl1271_debug(DEBUG_TX, "tx_complete: waking queues");
410 spin_lock_irqsave(&wl->wl_lock, flags);
411 ieee80211_wake_queues(wl->hw);
412 clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
413 spin_unlock_irqrestore(&wl->wl_lock, flags);
414 ieee80211_queue_work(wl->hw, &wl->tx_work);
415 }
416}
417
418/* caller must hold wl->mutex */
419void wl1271_tx_reset(struct wl1271 *wl)
420{
421 int i;
422 struct sk_buff *skb;
423
424 /* TX failure */
425/* control->flags = 0; FIXME */
426
427 while ((skb = skb_dequeue(&wl->tx_queue))) {
428 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
429 ieee80211_tx_status(wl->hw, skb);
430 }
431
432 for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
433 if (wl->tx_frames[i] != NULL) {
434 skb = wl->tx_frames[i];
435 wl->tx_frames[i] = NULL;
436 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
437 ieee80211_tx_status(wl->hw, skb);
438 }
439 wl->tx_frames_cnt = 0;
440}
441
442#define WL1271_TX_FLUSH_TIMEOUT 500000
443
444/* caller must *NOT* hold wl->mutex */
445void wl1271_tx_flush(struct wl1271 *wl)
446{
447 unsigned long timeout;
448 timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
449
450 while (!time_after(jiffies, timeout)) {
451 mutex_lock(&wl->mutex);
452 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d",
453 wl->tx_frames_cnt);
454 if ((wl->tx_frames_cnt == 0) &&
455 skb_queue_empty(&wl->tx_queue)) {
456 mutex_unlock(&wl->mutex);
457 return;
458 }
459 mutex_unlock(&wl->mutex);
460 msleep(1);
461 }
462
463 wl1271_warning("Unable to flush all TX buffers, timed out.");
464}
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