Commit | Line | Data |
---|---|---|
181d6902 ID |
1 | /* |
2 | Copyright (C) 2004 - 2008 rt2x00 SourceForge Project | |
3 | <http://rt2x00.serialmonkey.com> | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the | |
17 | Free Software Foundation, Inc., | |
18 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | */ | |
20 | ||
21 | /* | |
22 | Module: rt2x00lib | |
23 | Abstract: rt2x00 queue specific routines. | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
c4da0048 | 28 | #include <linux/dma-mapping.h> |
181d6902 ID |
29 | |
30 | #include "rt2x00.h" | |
31 | #include "rt2x00lib.h" | |
32 | ||
c4da0048 GW |
33 | struct sk_buff *rt2x00queue_alloc_rxskb(struct rt2x00_dev *rt2x00dev, |
34 | struct queue_entry *entry) | |
239c249d | 35 | { |
c4da0048 GW |
36 | struct sk_buff *skb; |
37 | struct skb_frame_desc *skbdesc; | |
2bb057d0 ID |
38 | unsigned int frame_size; |
39 | unsigned int head_size = 0; | |
40 | unsigned int tail_size = 0; | |
239c249d GW |
41 | |
42 | /* | |
43 | * The frame size includes descriptor size, because the | |
44 | * hardware directly receive the frame into the skbuffer. | |
45 | */ | |
c4da0048 | 46 | frame_size = entry->queue->data_size + entry->queue->desc_size; |
239c249d GW |
47 | |
48 | /* | |
ff352391 ID |
49 | * The payload should be aligned to a 4-byte boundary, |
50 | * this means we need at least 3 bytes for moving the frame | |
51 | * into the correct offset. | |
239c249d | 52 | */ |
2bb057d0 ID |
53 | head_size = 4; |
54 | ||
55 | /* | |
56 | * For IV/EIV/ICV assembly we must make sure there is | |
57 | * at least 8 bytes bytes available in headroom for IV/EIV | |
58 | * and 4 bytes for ICV data as tailroon. | |
59 | */ | |
60 | #ifdef CONFIG_RT2X00_LIB_CRYPTO | |
61 | if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags)) { | |
62 | head_size += 8; | |
63 | tail_size += 4; | |
64 | } | |
65 | #endif /* CONFIG_RT2X00_LIB_CRYPTO */ | |
239c249d GW |
66 | |
67 | /* | |
68 | * Allocate skbuffer. | |
69 | */ | |
2bb057d0 | 70 | skb = dev_alloc_skb(frame_size + head_size + tail_size); |
239c249d GW |
71 | if (!skb) |
72 | return NULL; | |
73 | ||
2bb057d0 ID |
74 | /* |
75 | * Make sure we not have a frame with the requested bytes | |
76 | * available in the head and tail. | |
77 | */ | |
78 | skb_reserve(skb, head_size); | |
239c249d GW |
79 | skb_put(skb, frame_size); |
80 | ||
c4da0048 GW |
81 | /* |
82 | * Populate skbdesc. | |
83 | */ | |
84 | skbdesc = get_skb_frame_desc(skb); | |
85 | memset(skbdesc, 0, sizeof(*skbdesc)); | |
86 | skbdesc->entry = entry; | |
87 | ||
88 | if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags)) { | |
89 | skbdesc->skb_dma = dma_map_single(rt2x00dev->dev, | |
90 | skb->data, | |
91 | skb->len, | |
92 | DMA_FROM_DEVICE); | |
93 | skbdesc->flags |= SKBDESC_DMA_MAPPED_RX; | |
94 | } | |
95 | ||
239c249d GW |
96 | return skb; |
97 | } | |
30caa6e3 | 98 | |
c4da0048 | 99 | void rt2x00queue_map_txskb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb) |
30caa6e3 | 100 | { |
c4da0048 GW |
101 | struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb); |
102 | ||
3ee54a07 ID |
103 | /* |
104 | * If device has requested headroom, we should make sure that | |
105 | * is also mapped to the DMA so it can be used for transfering | |
106 | * additional descriptor information to the hardware. | |
107 | */ | |
108 | skb_push(skb, rt2x00dev->hw->extra_tx_headroom); | |
109 | ||
110 | skbdesc->skb_dma = | |
111 | dma_map_single(rt2x00dev->dev, skb->data, skb->len, DMA_TO_DEVICE); | |
112 | ||
113 | /* | |
114 | * Restore data pointer to original location again. | |
115 | */ | |
116 | skb_pull(skb, rt2x00dev->hw->extra_tx_headroom); | |
117 | ||
c4da0048 GW |
118 | skbdesc->flags |= SKBDESC_DMA_MAPPED_TX; |
119 | } | |
120 | EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb); | |
121 | ||
122 | void rt2x00queue_unmap_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb) | |
123 | { | |
124 | struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb); | |
125 | ||
126 | if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) { | |
127 | dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len, | |
128 | DMA_FROM_DEVICE); | |
129 | skbdesc->flags &= ~SKBDESC_DMA_MAPPED_RX; | |
130 | } | |
131 | ||
132 | if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) { | |
3ee54a07 ID |
133 | /* |
134 | * Add headroom to the skb length, it has been removed | |
135 | * by the driver, but it was actually mapped to DMA. | |
136 | */ | |
137 | dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, | |
138 | skb->len + rt2x00dev->hw->extra_tx_headroom, | |
c4da0048 GW |
139 | DMA_TO_DEVICE); |
140 | skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX; | |
141 | } | |
142 | } | |
c4da0048 GW |
143 | |
144 | void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb) | |
145 | { | |
9a613195 ID |
146 | if (!skb) |
147 | return; | |
148 | ||
61243d8e | 149 | rt2x00queue_unmap_skb(rt2x00dev, skb); |
30caa6e3 GW |
150 | dev_kfree_skb_any(skb); |
151 | } | |
239c249d | 152 | |
bd88a781 ID |
153 | static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry, |
154 | struct txentry_desc *txdesc) | |
7050ec82 | 155 | { |
2e92e6f2 | 156 | struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; |
e039fa4a | 157 | struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb); |
5adf6d63 | 158 | struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif); |
7050ec82 | 159 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data; |
2e92e6f2 | 160 | struct ieee80211_rate *rate = |
e039fa4a | 161 | ieee80211_get_tx_rate(rt2x00dev->hw, tx_info); |
7050ec82 ID |
162 | const struct rt2x00_rate *hwrate; |
163 | unsigned int data_length; | |
164 | unsigned int duration; | |
165 | unsigned int residual; | |
d4764b29 | 166 | unsigned long irqflags; |
7050ec82 ID |
167 | |
168 | memset(txdesc, 0, sizeof(*txdesc)); | |
169 | ||
170 | /* | |
171 | * Initialize information from queue | |
172 | */ | |
173 | txdesc->queue = entry->queue->qid; | |
174 | txdesc->cw_min = entry->queue->cw_min; | |
175 | txdesc->cw_max = entry->queue->cw_max; | |
176 | txdesc->aifs = entry->queue->aifs; | |
177 | ||
2bb057d0 | 178 | /* Data length + CRC + IV/EIV/ICV/MMIC (when using encryption) */ |
7050ec82 ID |
179 | data_length = entry->skb->len + 4; |
180 | ||
7050ec82 ID |
181 | /* |
182 | * Check whether this frame is to be acked. | |
183 | */ | |
e039fa4a | 184 | if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) |
7050ec82 ID |
185 | __set_bit(ENTRY_TXD_ACK, &txdesc->flags); |
186 | ||
2bb057d0 ID |
187 | #ifdef CONFIG_RT2X00_LIB_CRYPTO |
188 | if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags) && | |
189 | !entry->skb->do_not_encrypt) { | |
190 | struct ieee80211_key_conf *hw_key = tx_info->control.hw_key; | |
191 | ||
192 | __set_bit(ENTRY_TXD_ENCRYPT, &txdesc->flags); | |
193 | ||
194 | txdesc->cipher = rt2x00crypto_key_to_cipher(hw_key); | |
195 | ||
196 | if (hw_key->flags & IEEE80211_KEY_FLAG_PAIRWISE) | |
197 | __set_bit(ENTRY_TXD_ENCRYPT_PAIRWISE, &txdesc->flags); | |
198 | ||
199 | txdesc->key_idx = hw_key->hw_key_idx; | |
200 | txdesc->iv_offset = ieee80211_get_hdrlen_from_skb(entry->skb); | |
201 | ||
202 | /* | |
203 | * Extend frame length to include all encryption overhead | |
204 | * that will be added by the hardware. | |
205 | */ | |
206 | data_length += rt2x00crypto_tx_overhead(tx_info); | |
207 | ||
208 | if (!(hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV)) | |
209 | __set_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc->flags); | |
210 | ||
211 | if (!(hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) | |
212 | __set_bit(ENTRY_TXD_ENCRYPT_MMIC, &txdesc->flags); | |
213 | } | |
214 | #endif /* CONFIG_RT2X00_LIB_CRYPTO */ | |
215 | ||
7050ec82 ID |
216 | /* |
217 | * Check if this is a RTS/CTS frame | |
218 | */ | |
ac104462 ID |
219 | if (ieee80211_is_rts(hdr->frame_control) || |
220 | ieee80211_is_cts(hdr->frame_control)) { | |
7050ec82 | 221 | __set_bit(ENTRY_TXD_BURST, &txdesc->flags); |
ac104462 | 222 | if (ieee80211_is_rts(hdr->frame_control)) |
7050ec82 | 223 | __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags); |
e039fa4a | 224 | else |
7050ec82 | 225 | __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags); |
e039fa4a | 226 | if (tx_info->control.rts_cts_rate_idx >= 0) |
2e92e6f2 | 227 | rate = |
e039fa4a | 228 | ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info); |
7050ec82 ID |
229 | } |
230 | ||
231 | /* | |
232 | * Determine retry information. | |
233 | */ | |
e039fa4a JB |
234 | txdesc->retry_limit = tx_info->control.retry_limit; |
235 | if (tx_info->flags & IEEE80211_TX_CTL_LONG_RETRY_LIMIT) | |
7050ec82 ID |
236 | __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags); |
237 | ||
238 | /* | |
239 | * Check if more fragments are pending | |
240 | */ | |
8b7b1e05 | 241 | if (ieee80211_has_morefrags(hdr->frame_control)) { |
7050ec82 ID |
242 | __set_bit(ENTRY_TXD_BURST, &txdesc->flags); |
243 | __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags); | |
244 | } | |
245 | ||
246 | /* | |
247 | * Beacons and probe responses require the tsf timestamp | |
248 | * to be inserted into the frame. | |
249 | */ | |
ac104462 ID |
250 | if (ieee80211_is_beacon(hdr->frame_control) || |
251 | ieee80211_is_probe_resp(hdr->frame_control)) | |
7050ec82 ID |
252 | __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags); |
253 | ||
254 | /* | |
255 | * Determine with what IFS priority this frame should be send. | |
256 | * Set ifs to IFS_SIFS when the this is not the first fragment, | |
257 | * or this fragment came after RTS/CTS. | |
258 | */ | |
259 | if (test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) { | |
260 | txdesc->ifs = IFS_SIFS; | |
e039fa4a | 261 | } else if (tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) { |
7050ec82 ID |
262 | __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags); |
263 | txdesc->ifs = IFS_BACKOFF; | |
264 | } else { | |
265 | txdesc->ifs = IFS_SIFS; | |
266 | } | |
267 | ||
5adf6d63 ID |
268 | /* |
269 | * Hardware should insert sequence counter. | |
270 | * FIXME: We insert a software sequence counter first for | |
271 | * hardware that doesn't support hardware sequence counting. | |
272 | * | |
273 | * This is wrong because beacons are not getting sequence | |
274 | * numbers assigned properly. | |
275 | * | |
276 | * A secondary problem exists for drivers that cannot toggle | |
277 | * sequence counting per-frame, since those will override the | |
278 | * sequence counter given by mac80211. | |
279 | */ | |
280 | if (tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) { | |
d4764b29 | 281 | spin_lock_irqsave(&intf->seqlock, irqflags); |
5adf6d63 ID |
282 | |
283 | if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags)) | |
284 | intf->seqno += 0x10; | |
285 | hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); | |
286 | hdr->seq_ctrl |= cpu_to_le16(intf->seqno); | |
287 | ||
d4764b29 | 288 | spin_unlock_irqrestore(&intf->seqlock, irqflags); |
5adf6d63 ID |
289 | |
290 | __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags); | |
291 | } | |
292 | ||
7050ec82 ID |
293 | /* |
294 | * PLCP setup | |
295 | * Length calculation depends on OFDM/CCK rate. | |
296 | */ | |
297 | hwrate = rt2x00_get_rate(rate->hw_value); | |
298 | txdesc->signal = hwrate->plcp; | |
299 | txdesc->service = 0x04; | |
300 | ||
301 | if (hwrate->flags & DEV_RATE_OFDM) { | |
302 | __set_bit(ENTRY_TXD_OFDM_RATE, &txdesc->flags); | |
303 | ||
304 | txdesc->length_high = (data_length >> 6) & 0x3f; | |
305 | txdesc->length_low = data_length & 0x3f; | |
306 | } else { | |
307 | /* | |
308 | * Convert length to microseconds. | |
309 | */ | |
310 | residual = get_duration_res(data_length, hwrate->bitrate); | |
311 | duration = get_duration(data_length, hwrate->bitrate); | |
312 | ||
313 | if (residual != 0) { | |
314 | duration++; | |
315 | ||
316 | /* | |
317 | * Check if we need to set the Length Extension | |
318 | */ | |
319 | if (hwrate->bitrate == 110 && residual <= 30) | |
320 | txdesc->service |= 0x80; | |
321 | } | |
322 | ||
323 | txdesc->length_high = (duration >> 8) & 0xff; | |
324 | txdesc->length_low = duration & 0xff; | |
325 | ||
326 | /* | |
327 | * When preamble is enabled we should set the | |
328 | * preamble bit for the signal. | |
329 | */ | |
330 | if (rt2x00_get_rate_preamble(rate->hw_value)) | |
331 | txdesc->signal |= 0x08; | |
332 | } | |
333 | } | |
7050ec82 | 334 | |
bd88a781 ID |
335 | static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry, |
336 | struct txentry_desc *txdesc) | |
7050ec82 | 337 | { |
b869767b ID |
338 | struct data_queue *queue = entry->queue; |
339 | struct rt2x00_dev *rt2x00dev = queue->rt2x00dev; | |
7050ec82 ID |
340 | |
341 | rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, entry->skb, txdesc); | |
342 | ||
343 | /* | |
344 | * All processing on the frame has been completed, this means | |
345 | * it is now ready to be dumped to userspace through debugfs. | |
346 | */ | |
347 | rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TX, entry->skb); | |
348 | ||
349 | /* | |
b869767b ID |
350 | * Check if we need to kick the queue, there are however a few rules |
351 | * 1) Don't kick beacon queue | |
352 | * 2) Don't kick unless this is the last in frame in a burst. | |
353 | * When the burst flag is set, this frame is always followed | |
354 | * by another frame which in some way are related to eachother. | |
355 | * This is true for fragments, RTS or CTS-to-self frames. | |
356 | * 3) Rule 2 can be broken when the available entries | |
357 | * in the queue are less then a certain threshold. | |
7050ec82 | 358 | */ |
b869767b ID |
359 | if (entry->queue->qid == QID_BEACON) |
360 | return; | |
361 | ||
362 | if (rt2x00queue_threshold(queue) || | |
363 | !test_bit(ENTRY_TXD_BURST, &txdesc->flags)) | |
364 | rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, queue->qid); | |
7050ec82 | 365 | } |
7050ec82 | 366 | |
6db3786a ID |
367 | int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb) |
368 | { | |
369 | struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX); | |
370 | struct txentry_desc txdesc; | |
d74f5ba4 | 371 | struct skb_frame_desc *skbdesc; |
2bb057d0 | 372 | unsigned int iv_len = IEEE80211_SKB_CB(skb)->control.iv_len; |
6db3786a ID |
373 | |
374 | if (unlikely(rt2x00queue_full(queue))) | |
375 | return -EINVAL; | |
376 | ||
0262ab0d | 377 | if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) { |
6db3786a ID |
378 | ERROR(queue->rt2x00dev, |
379 | "Arrived at non-free entry in the non-full queue %d.\n" | |
380 | "Please file bug report to %s.\n", | |
381 | queue->qid, DRV_PROJECT); | |
382 | return -EINVAL; | |
383 | } | |
384 | ||
385 | /* | |
386 | * Copy all TX descriptor information into txdesc, | |
387 | * after that we are free to use the skb->cb array | |
388 | * for our information. | |
389 | */ | |
390 | entry->skb = skb; | |
391 | rt2x00queue_create_tx_descriptor(entry, &txdesc); | |
392 | ||
d74f5ba4 | 393 | /* |
2bb057d0 ID |
394 | * All information is retreived from the skb->cb array, |
395 | * now we should claim ownership of the driver part of that | |
396 | * array. | |
d74f5ba4 ID |
397 | */ |
398 | skbdesc = get_skb_frame_desc(entry->skb); | |
399 | memset(skbdesc, 0, sizeof(*skbdesc)); | |
400 | skbdesc->entry = entry; | |
401 | ||
2bb057d0 ID |
402 | /* |
403 | * When hardware encryption is supported, and this frame | |
404 | * is to be encrypted, we should strip the IV/EIV data from | |
405 | * the frame so we can provide it to the driver seperately. | |
406 | */ | |
407 | if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) && | |
408 | !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) | |
409 | rt2x00crypto_tx_remove_iv(skb, iv_len); | |
410 | ||
411 | /* | |
412 | * It could be possible that the queue was corrupted and this | |
413 | * call failed. Just drop the frame, we cannot rollback and pass | |
414 | * the frame to mac80211 because the skb->cb has now been tainted. | |
415 | */ | |
6db3786a | 416 | if (unlikely(queue->rt2x00dev->ops->lib->write_tx_data(entry))) { |
0262ab0d | 417 | clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags); |
2bb057d0 ID |
418 | dev_kfree_skb_any(entry->skb); |
419 | entry->skb = NULL; | |
420 | return 0; | |
6db3786a ID |
421 | } |
422 | ||
d74f5ba4 ID |
423 | if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags)) |
424 | rt2x00queue_map_txskb(queue->rt2x00dev, skb); | |
425 | ||
0262ab0d | 426 | set_bit(ENTRY_DATA_PENDING, &entry->flags); |
6db3786a ID |
427 | |
428 | rt2x00queue_index_inc(queue, Q_INDEX); | |
429 | rt2x00queue_write_tx_descriptor(entry, &txdesc); | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
bd88a781 ID |
434 | int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev, |
435 | struct ieee80211_vif *vif) | |
436 | { | |
437 | struct rt2x00_intf *intf = vif_to_intf(vif); | |
438 | struct skb_frame_desc *skbdesc; | |
439 | struct txentry_desc txdesc; | |
440 | __le32 desc[16]; | |
441 | ||
442 | if (unlikely(!intf->beacon)) | |
443 | return -ENOBUFS; | |
444 | ||
445 | intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif); | |
446 | if (!intf->beacon->skb) | |
447 | return -ENOMEM; | |
448 | ||
449 | /* | |
450 | * Copy all TX descriptor information into txdesc, | |
451 | * after that we are free to use the skb->cb array | |
452 | * for our information. | |
453 | */ | |
454 | rt2x00queue_create_tx_descriptor(intf->beacon, &txdesc); | |
455 | ||
456 | /* | |
457 | * For the descriptor we use a local array from where the | |
458 | * driver can move it to the correct location required for | |
459 | * the hardware. | |
460 | */ | |
461 | memset(desc, 0, sizeof(desc)); | |
462 | ||
463 | /* | |
464 | * Fill in skb descriptor | |
465 | */ | |
466 | skbdesc = get_skb_frame_desc(intf->beacon->skb); | |
467 | memset(skbdesc, 0, sizeof(*skbdesc)); | |
468 | skbdesc->desc = desc; | |
469 | skbdesc->desc_len = intf->beacon->queue->desc_size; | |
470 | skbdesc->entry = intf->beacon; | |
471 | ||
472 | /* | |
473 | * Write TX descriptor into reserved room in front of the beacon. | |
474 | */ | |
475 | rt2x00queue_write_tx_descriptor(intf->beacon, &txdesc); | |
476 | ||
477 | /* | |
478 | * Send beacon to hardware. | |
479 | * Also enable beacon generation, which might have been disabled | |
480 | * by the driver during the config_beacon() callback function. | |
481 | */ | |
482 | rt2x00dev->ops->lib->write_beacon(intf->beacon); | |
483 | rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, QID_BEACON); | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
181d6902 | 488 | struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev, |
e58c6aca | 489 | const enum data_queue_qid queue) |
181d6902 ID |
490 | { |
491 | int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags); | |
492 | ||
61448f88 | 493 | if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx) |
181d6902 ID |
494 | return &rt2x00dev->tx[queue]; |
495 | ||
496 | if (!rt2x00dev->bcn) | |
497 | return NULL; | |
498 | ||
e58c6aca | 499 | if (queue == QID_BEACON) |
181d6902 | 500 | return &rt2x00dev->bcn[0]; |
e58c6aca | 501 | else if (queue == QID_ATIM && atim) |
181d6902 ID |
502 | return &rt2x00dev->bcn[1]; |
503 | ||
504 | return NULL; | |
505 | } | |
506 | EXPORT_SYMBOL_GPL(rt2x00queue_get_queue); | |
507 | ||
508 | struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue, | |
509 | enum queue_index index) | |
510 | { | |
511 | struct queue_entry *entry; | |
5f46c4d0 | 512 | unsigned long irqflags; |
181d6902 ID |
513 | |
514 | if (unlikely(index >= Q_INDEX_MAX)) { | |
515 | ERROR(queue->rt2x00dev, | |
516 | "Entry requested from invalid index type (%d)\n", index); | |
517 | return NULL; | |
518 | } | |
519 | ||
5f46c4d0 | 520 | spin_lock_irqsave(&queue->lock, irqflags); |
181d6902 ID |
521 | |
522 | entry = &queue->entries[queue->index[index]]; | |
523 | ||
5f46c4d0 | 524 | spin_unlock_irqrestore(&queue->lock, irqflags); |
181d6902 ID |
525 | |
526 | return entry; | |
527 | } | |
528 | EXPORT_SYMBOL_GPL(rt2x00queue_get_entry); | |
529 | ||
530 | void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index) | |
531 | { | |
5f46c4d0 ID |
532 | unsigned long irqflags; |
533 | ||
181d6902 ID |
534 | if (unlikely(index >= Q_INDEX_MAX)) { |
535 | ERROR(queue->rt2x00dev, | |
536 | "Index change on invalid index type (%d)\n", index); | |
537 | return; | |
538 | } | |
539 | ||
5f46c4d0 | 540 | spin_lock_irqsave(&queue->lock, irqflags); |
181d6902 ID |
541 | |
542 | queue->index[index]++; | |
543 | if (queue->index[index] >= queue->limit) | |
544 | queue->index[index] = 0; | |
545 | ||
10b6b801 ID |
546 | if (index == Q_INDEX) { |
547 | queue->length++; | |
548 | } else if (index == Q_INDEX_DONE) { | |
549 | queue->length--; | |
550 | queue->count ++; | |
551 | } | |
181d6902 | 552 | |
5f46c4d0 | 553 | spin_unlock_irqrestore(&queue->lock, irqflags); |
181d6902 | 554 | } |
181d6902 ID |
555 | |
556 | static void rt2x00queue_reset(struct data_queue *queue) | |
557 | { | |
5f46c4d0 ID |
558 | unsigned long irqflags; |
559 | ||
560 | spin_lock_irqsave(&queue->lock, irqflags); | |
181d6902 ID |
561 | |
562 | queue->count = 0; | |
563 | queue->length = 0; | |
564 | memset(queue->index, 0, sizeof(queue->index)); | |
565 | ||
5f46c4d0 | 566 | spin_unlock_irqrestore(&queue->lock, irqflags); |
181d6902 ID |
567 | } |
568 | ||
569 | void rt2x00queue_init_rx(struct rt2x00_dev *rt2x00dev) | |
570 | { | |
571 | struct data_queue *queue = rt2x00dev->rx; | |
572 | unsigned int i; | |
573 | ||
574 | rt2x00queue_reset(queue); | |
575 | ||
576 | if (!rt2x00dev->ops->lib->init_rxentry) | |
577 | return; | |
578 | ||
9c0ab712 ID |
579 | for (i = 0; i < queue->limit; i++) { |
580 | queue->entries[i].flags = 0; | |
581 | ||
181d6902 ID |
582 | rt2x00dev->ops->lib->init_rxentry(rt2x00dev, |
583 | &queue->entries[i]); | |
9c0ab712 | 584 | } |
181d6902 ID |
585 | } |
586 | ||
587 | void rt2x00queue_init_tx(struct rt2x00_dev *rt2x00dev) | |
588 | { | |
589 | struct data_queue *queue; | |
590 | unsigned int i; | |
591 | ||
592 | txall_queue_for_each(rt2x00dev, queue) { | |
593 | rt2x00queue_reset(queue); | |
594 | ||
595 | if (!rt2x00dev->ops->lib->init_txentry) | |
596 | continue; | |
597 | ||
9c0ab712 ID |
598 | for (i = 0; i < queue->limit; i++) { |
599 | queue->entries[i].flags = 0; | |
600 | ||
181d6902 ID |
601 | rt2x00dev->ops->lib->init_txentry(rt2x00dev, |
602 | &queue->entries[i]); | |
9c0ab712 | 603 | } |
181d6902 ID |
604 | } |
605 | } | |
606 | ||
607 | static int rt2x00queue_alloc_entries(struct data_queue *queue, | |
608 | const struct data_queue_desc *qdesc) | |
609 | { | |
610 | struct queue_entry *entries; | |
611 | unsigned int entry_size; | |
612 | unsigned int i; | |
613 | ||
614 | rt2x00queue_reset(queue); | |
615 | ||
616 | queue->limit = qdesc->entry_num; | |
b869767b | 617 | queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10); |
181d6902 ID |
618 | queue->data_size = qdesc->data_size; |
619 | queue->desc_size = qdesc->desc_size; | |
620 | ||
621 | /* | |
622 | * Allocate all queue entries. | |
623 | */ | |
624 | entry_size = sizeof(*entries) + qdesc->priv_size; | |
625 | entries = kzalloc(queue->limit * entry_size, GFP_KERNEL); | |
626 | if (!entries) | |
627 | return -ENOMEM; | |
628 | ||
629 | #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \ | |
231be4e9 AB |
630 | ( ((char *)(__base)) + ((__limit) * (__esize)) + \ |
631 | ((__index) * (__psize)) ) | |
181d6902 ID |
632 | |
633 | for (i = 0; i < queue->limit; i++) { | |
634 | entries[i].flags = 0; | |
635 | entries[i].queue = queue; | |
636 | entries[i].skb = NULL; | |
637 | entries[i].entry_idx = i; | |
638 | entries[i].priv_data = | |
639 | QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit, | |
640 | sizeof(*entries), qdesc->priv_size); | |
641 | } | |
642 | ||
643 | #undef QUEUE_ENTRY_PRIV_OFFSET | |
644 | ||
645 | queue->entries = entries; | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
c4da0048 GW |
650 | static void rt2x00queue_free_skbs(struct rt2x00_dev *rt2x00dev, |
651 | struct data_queue *queue) | |
30caa6e3 GW |
652 | { |
653 | unsigned int i; | |
654 | ||
655 | if (!queue->entries) | |
656 | return; | |
657 | ||
658 | for (i = 0; i < queue->limit; i++) { | |
659 | if (queue->entries[i].skb) | |
c4da0048 | 660 | rt2x00queue_free_skb(rt2x00dev, queue->entries[i].skb); |
30caa6e3 GW |
661 | } |
662 | } | |
663 | ||
c4da0048 GW |
664 | static int rt2x00queue_alloc_rxskbs(struct rt2x00_dev *rt2x00dev, |
665 | struct data_queue *queue) | |
30caa6e3 GW |
666 | { |
667 | unsigned int i; | |
668 | struct sk_buff *skb; | |
669 | ||
670 | for (i = 0; i < queue->limit; i++) { | |
c4da0048 | 671 | skb = rt2x00queue_alloc_rxskb(rt2x00dev, &queue->entries[i]); |
30caa6e3 | 672 | if (!skb) |
61243d8e | 673 | return -ENOMEM; |
30caa6e3 GW |
674 | queue->entries[i].skb = skb; |
675 | } | |
676 | ||
677 | return 0; | |
30caa6e3 GW |
678 | } |
679 | ||
181d6902 ID |
680 | int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev) |
681 | { | |
682 | struct data_queue *queue; | |
683 | int status; | |
684 | ||
181d6902 ID |
685 | status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx); |
686 | if (status) | |
687 | goto exit; | |
688 | ||
689 | tx_queue_for_each(rt2x00dev, queue) { | |
690 | status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx); | |
691 | if (status) | |
692 | goto exit; | |
693 | } | |
694 | ||
695 | status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn); | |
696 | if (status) | |
697 | goto exit; | |
698 | ||
30caa6e3 GW |
699 | if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) { |
700 | status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1], | |
701 | rt2x00dev->ops->atim); | |
702 | if (status) | |
703 | goto exit; | |
704 | } | |
181d6902 | 705 | |
c4da0048 | 706 | status = rt2x00queue_alloc_rxskbs(rt2x00dev, rt2x00dev->rx); |
181d6902 ID |
707 | if (status) |
708 | goto exit; | |
709 | ||
710 | return 0; | |
711 | ||
712 | exit: | |
713 | ERROR(rt2x00dev, "Queue entries allocation failed.\n"); | |
714 | ||
715 | rt2x00queue_uninitialize(rt2x00dev); | |
716 | ||
717 | return status; | |
718 | } | |
719 | ||
720 | void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev) | |
721 | { | |
722 | struct data_queue *queue; | |
723 | ||
c4da0048 | 724 | rt2x00queue_free_skbs(rt2x00dev, rt2x00dev->rx); |
30caa6e3 | 725 | |
181d6902 ID |
726 | queue_for_each(rt2x00dev, queue) { |
727 | kfree(queue->entries); | |
728 | queue->entries = NULL; | |
729 | } | |
730 | } | |
731 | ||
8f539276 ID |
732 | static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev, |
733 | struct data_queue *queue, enum data_queue_qid qid) | |
734 | { | |
735 | spin_lock_init(&queue->lock); | |
736 | ||
737 | queue->rt2x00dev = rt2x00dev; | |
738 | queue->qid = qid; | |
739 | queue->aifs = 2; | |
740 | queue->cw_min = 5; | |
741 | queue->cw_max = 10; | |
742 | } | |
743 | ||
181d6902 ID |
744 | int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev) |
745 | { | |
746 | struct data_queue *queue; | |
747 | enum data_queue_qid qid; | |
748 | unsigned int req_atim = | |
749 | !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags); | |
750 | ||
751 | /* | |
752 | * We need the following queues: | |
753 | * RX: 1 | |
61448f88 | 754 | * TX: ops->tx_queues |
181d6902 ID |
755 | * Beacon: 1 |
756 | * Atim: 1 (if required) | |
757 | */ | |
61448f88 | 758 | rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim; |
181d6902 ID |
759 | |
760 | queue = kzalloc(rt2x00dev->data_queues * sizeof(*queue), GFP_KERNEL); | |
761 | if (!queue) { | |
762 | ERROR(rt2x00dev, "Queue allocation failed.\n"); | |
763 | return -ENOMEM; | |
764 | } | |
765 | ||
766 | /* | |
767 | * Initialize pointers | |
768 | */ | |
769 | rt2x00dev->rx = queue; | |
770 | rt2x00dev->tx = &queue[1]; | |
61448f88 | 771 | rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues]; |
181d6902 ID |
772 | |
773 | /* | |
774 | * Initialize queue parameters. | |
775 | * RX: qid = QID_RX | |
776 | * TX: qid = QID_AC_BE + index | |
777 | * TX: cw_min: 2^5 = 32. | |
778 | * TX: cw_max: 2^10 = 1024. | |
565a019a ID |
779 | * BCN: qid = QID_BEACON |
780 | * ATIM: qid = QID_ATIM | |
181d6902 | 781 | */ |
8f539276 | 782 | rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX); |
181d6902 | 783 | |
8f539276 ID |
784 | qid = QID_AC_BE; |
785 | tx_queue_for_each(rt2x00dev, queue) | |
786 | rt2x00queue_init(rt2x00dev, queue, qid++); | |
181d6902 | 787 | |
565a019a | 788 | rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[0], QID_BEACON); |
181d6902 | 789 | if (req_atim) |
565a019a | 790 | rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[1], QID_ATIM); |
181d6902 ID |
791 | |
792 | return 0; | |
793 | } | |
794 | ||
795 | void rt2x00queue_free(struct rt2x00_dev *rt2x00dev) | |
796 | { | |
797 | kfree(rt2x00dev->rx); | |
798 | rt2x00dev->rx = NULL; | |
799 | rt2x00dev->tx = NULL; | |
800 | rt2x00dev->bcn = NULL; | |
801 | } |