2 Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
3 <http://rt2x00.serialmonkey.com>
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.
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.
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.
23 Abstract: rt2x00 queue specific routines.
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/dma-mapping.h>
31 #include "rt2x00lib.h"
33 struct sk_buff *rt2x00queue_alloc_rxskb(struct rt2x00_dev *rt2x00dev,
34 struct queue_entry *entry)
36 unsigned int frame_size;
37 unsigned int reserved_size;
39 struct skb_frame_desc *skbdesc;
42 * The frame size includes descriptor size, because the
43 * hardware directly receive the frame into the skbuffer.
45 frame_size = entry->queue->data_size + entry->queue->desc_size;
48 * The payload should be aligned to a 4-byte boundary,
49 * this means we need at least 3 bytes for moving the frame
50 * into the correct offset.
57 skb = dev_alloc_skb(frame_size + reserved_size);
61 skb_reserve(skb, reserved_size);
62 skb_put(skb, frame_size);
67 skbdesc = get_skb_frame_desc(skb);
68 memset(skbdesc, 0, sizeof(*skbdesc));
69 skbdesc->entry = entry;
71 if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags)) {
72 skbdesc->skb_dma = dma_map_single(rt2x00dev->dev,
76 skbdesc->flags |= SKBDESC_DMA_MAPPED_RX;
82 void rt2x00queue_map_txskb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
84 struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
86 skbdesc->skb_dma = dma_map_single(rt2x00dev->dev, skb->data, skb->len,
88 skbdesc->flags |= SKBDESC_DMA_MAPPED_TX;
90 EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb);
92 void rt2x00queue_unmap_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
94 struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
96 if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) {
97 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
99 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_RX;
102 if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) {
103 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
105 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX;
109 void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
114 rt2x00queue_unmap_skb(rt2x00dev, skb);
115 dev_kfree_skb_any(skb);
118 static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
119 struct txentry_desc *txdesc)
121 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
122 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
123 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
124 struct ieee80211_rate *rate =
125 ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
126 const struct rt2x00_rate *hwrate;
127 unsigned int data_length;
128 unsigned int duration;
129 unsigned int residual;
131 memset(txdesc, 0, sizeof(*txdesc));
134 * Initialize information from queue
136 txdesc->queue = entry->queue->qid;
137 txdesc->cw_min = entry->queue->cw_min;
138 txdesc->cw_max = entry->queue->cw_max;
139 txdesc->aifs = entry->queue->aifs;
141 /* Data length should be extended with 4 bytes for CRC */
142 data_length = entry->skb->len + 4;
145 * Check whether this frame is to be acked.
147 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
148 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
151 * Check if this is a RTS/CTS frame
153 if (ieee80211_is_rts(hdr->frame_control) ||
154 ieee80211_is_cts(hdr->frame_control)) {
155 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
156 if (ieee80211_is_rts(hdr->frame_control))
157 __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
159 __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
160 if (tx_info->control.rts_cts_rate_idx >= 0)
162 ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
166 * Determine retry information.
168 txdesc->retry_limit = tx_info->control.retry_limit;
169 if (tx_info->flags & IEEE80211_TX_CTL_LONG_RETRY_LIMIT)
170 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
173 * Check if more fragments are pending
175 if (ieee80211_has_morefrags(hdr->frame_control)) {
176 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
177 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
181 * Beacons and probe responses require the tsf timestamp
182 * to be inserted into the frame.
184 if (ieee80211_is_beacon(hdr->frame_control) ||
185 ieee80211_is_probe_resp(hdr->frame_control))
186 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
189 * Determine with what IFS priority this frame should be send.
190 * Set ifs to IFS_SIFS when the this is not the first fragment,
191 * or this fragment came after RTS/CTS.
193 if (test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) {
194 txdesc->ifs = IFS_SIFS;
195 } else if (tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) {
196 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
197 txdesc->ifs = IFS_BACKOFF;
199 txdesc->ifs = IFS_SIFS;
204 * Length calculation depends on OFDM/CCK rate.
206 hwrate = rt2x00_get_rate(rate->hw_value);
207 txdesc->signal = hwrate->plcp;
208 txdesc->service = 0x04;
210 if (hwrate->flags & DEV_RATE_OFDM) {
211 __set_bit(ENTRY_TXD_OFDM_RATE, &txdesc->flags);
213 txdesc->length_high = (data_length >> 6) & 0x3f;
214 txdesc->length_low = data_length & 0x3f;
217 * Convert length to microseconds.
219 residual = get_duration_res(data_length, hwrate->bitrate);
220 duration = get_duration(data_length, hwrate->bitrate);
226 * Check if we need to set the Length Extension
228 if (hwrate->bitrate == 110 && residual <= 30)
229 txdesc->service |= 0x80;
232 txdesc->length_high = (duration >> 8) & 0xff;
233 txdesc->length_low = duration & 0xff;
236 * When preamble is enabled we should set the
237 * preamble bit for the signal.
239 if (rt2x00_get_rate_preamble(rate->hw_value))
240 txdesc->signal |= 0x08;
244 static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
245 struct txentry_desc *txdesc)
247 struct data_queue *queue = entry->queue;
248 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
250 rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, entry->skb, txdesc);
253 * All processing on the frame has been completed, this means
254 * it is now ready to be dumped to userspace through debugfs.
256 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TX, entry->skb);
259 * Check if we need to kick the queue, there are however a few rules
260 * 1) Don't kick beacon queue
261 * 2) Don't kick unless this is the last in frame in a burst.
262 * When the burst flag is set, this frame is always followed
263 * by another frame which in some way are related to eachother.
264 * This is true for fragments, RTS or CTS-to-self frames.
265 * 3) Rule 2 can be broken when the available entries
266 * in the queue are less then a certain threshold.
268 if (entry->queue->qid == QID_BEACON)
271 if (rt2x00queue_threshold(queue) ||
272 !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
273 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, queue->qid);
276 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
278 struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
279 struct txentry_desc txdesc;
280 struct skb_frame_desc *skbdesc;
282 if (unlikely(rt2x00queue_full(queue)))
285 if (__test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
286 ERROR(queue->rt2x00dev,
287 "Arrived at non-free entry in the non-full queue %d.\n"
288 "Please file bug report to %s.\n",
289 queue->qid, DRV_PROJECT);
294 * Copy all TX descriptor information into txdesc,
295 * after that we are free to use the skb->cb array
296 * for our information.
299 rt2x00queue_create_tx_descriptor(entry, &txdesc);
302 * skb->cb array is now ours and we are free to use it.
304 skbdesc = get_skb_frame_desc(entry->skb);
305 memset(skbdesc, 0, sizeof(*skbdesc));
306 skbdesc->entry = entry;
308 if (unlikely(queue->rt2x00dev->ops->lib->write_tx_data(entry))) {
309 __clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
313 if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
314 rt2x00queue_map_txskb(queue->rt2x00dev, skb);
316 __set_bit(ENTRY_DATA_PENDING, &entry->flags);
318 rt2x00queue_index_inc(queue, Q_INDEX);
319 rt2x00queue_write_tx_descriptor(entry, &txdesc);
324 int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
325 struct ieee80211_vif *vif)
327 struct rt2x00_intf *intf = vif_to_intf(vif);
328 struct skb_frame_desc *skbdesc;
329 struct txentry_desc txdesc;
332 if (unlikely(!intf->beacon))
335 intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
336 if (!intf->beacon->skb)
340 * Copy all TX descriptor information into txdesc,
341 * after that we are free to use the skb->cb array
342 * for our information.
344 rt2x00queue_create_tx_descriptor(intf->beacon, &txdesc);
347 * For the descriptor we use a local array from where the
348 * driver can move it to the correct location required for
351 memset(desc, 0, sizeof(desc));
354 * Fill in skb descriptor
356 skbdesc = get_skb_frame_desc(intf->beacon->skb);
357 memset(skbdesc, 0, sizeof(*skbdesc));
358 skbdesc->desc = desc;
359 skbdesc->desc_len = intf->beacon->queue->desc_size;
360 skbdesc->entry = intf->beacon;
363 * Write TX descriptor into reserved room in front of the beacon.
365 rt2x00queue_write_tx_descriptor(intf->beacon, &txdesc);
368 * Send beacon to hardware.
369 * Also enable beacon generation, which might have been disabled
370 * by the driver during the config_beacon() callback function.
372 rt2x00dev->ops->lib->write_beacon(intf->beacon);
373 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, QID_BEACON);
378 struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
379 const enum data_queue_qid queue)
381 int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
383 if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx)
384 return &rt2x00dev->tx[queue];
389 if (queue == QID_BEACON)
390 return &rt2x00dev->bcn[0];
391 else if (queue == QID_ATIM && atim)
392 return &rt2x00dev->bcn[1];
396 EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
398 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
399 enum queue_index index)
401 struct queue_entry *entry;
402 unsigned long irqflags;
404 if (unlikely(index >= Q_INDEX_MAX)) {
405 ERROR(queue->rt2x00dev,
406 "Entry requested from invalid index type (%d)\n", index);
410 spin_lock_irqsave(&queue->lock, irqflags);
412 entry = &queue->entries[queue->index[index]];
414 spin_unlock_irqrestore(&queue->lock, irqflags);
418 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
420 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
422 unsigned long irqflags;
424 if (unlikely(index >= Q_INDEX_MAX)) {
425 ERROR(queue->rt2x00dev,
426 "Index change on invalid index type (%d)\n", index);
430 spin_lock_irqsave(&queue->lock, irqflags);
432 queue->index[index]++;
433 if (queue->index[index] >= queue->limit)
434 queue->index[index] = 0;
436 if (index == Q_INDEX) {
438 } else if (index == Q_INDEX_DONE) {
443 spin_unlock_irqrestore(&queue->lock, irqflags);
446 static void rt2x00queue_reset(struct data_queue *queue)
448 unsigned long irqflags;
450 spin_lock_irqsave(&queue->lock, irqflags);
454 memset(queue->index, 0, sizeof(queue->index));
456 spin_unlock_irqrestore(&queue->lock, irqflags);
459 void rt2x00queue_init_rx(struct rt2x00_dev *rt2x00dev)
461 struct data_queue *queue = rt2x00dev->rx;
464 rt2x00queue_reset(queue);
466 if (!rt2x00dev->ops->lib->init_rxentry)
469 for (i = 0; i < queue->limit; i++)
470 rt2x00dev->ops->lib->init_rxentry(rt2x00dev,
474 void rt2x00queue_init_tx(struct rt2x00_dev *rt2x00dev)
476 struct data_queue *queue;
479 txall_queue_for_each(rt2x00dev, queue) {
480 rt2x00queue_reset(queue);
482 if (!rt2x00dev->ops->lib->init_txentry)
485 for (i = 0; i < queue->limit; i++)
486 rt2x00dev->ops->lib->init_txentry(rt2x00dev,
491 static int rt2x00queue_alloc_entries(struct data_queue *queue,
492 const struct data_queue_desc *qdesc)
494 struct queue_entry *entries;
495 unsigned int entry_size;
498 rt2x00queue_reset(queue);
500 queue->limit = qdesc->entry_num;
501 queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
502 queue->data_size = qdesc->data_size;
503 queue->desc_size = qdesc->desc_size;
506 * Allocate all queue entries.
508 entry_size = sizeof(*entries) + qdesc->priv_size;
509 entries = kzalloc(queue->limit * entry_size, GFP_KERNEL);
513 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
514 ( ((char *)(__base)) + ((__limit) * (__esize)) + \
515 ((__index) * (__psize)) )
517 for (i = 0; i < queue->limit; i++) {
518 entries[i].flags = 0;
519 entries[i].queue = queue;
520 entries[i].skb = NULL;
521 entries[i].entry_idx = i;
522 entries[i].priv_data =
523 QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
524 sizeof(*entries), qdesc->priv_size);
527 #undef QUEUE_ENTRY_PRIV_OFFSET
529 queue->entries = entries;
534 static void rt2x00queue_free_skbs(struct rt2x00_dev *rt2x00dev,
535 struct data_queue *queue)
542 for (i = 0; i < queue->limit; i++) {
543 if (queue->entries[i].skb)
544 rt2x00queue_free_skb(rt2x00dev, queue->entries[i].skb);
548 static int rt2x00queue_alloc_rxskbs(struct rt2x00_dev *rt2x00dev,
549 struct data_queue *queue)
554 for (i = 0; i < queue->limit; i++) {
555 skb = rt2x00queue_alloc_rxskb(rt2x00dev, &queue->entries[i]);
558 queue->entries[i].skb = skb;
564 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
566 struct data_queue *queue;
569 status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
573 tx_queue_for_each(rt2x00dev, queue) {
574 status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
579 status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
583 if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) {
584 status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1],
585 rt2x00dev->ops->atim);
590 status = rt2x00queue_alloc_rxskbs(rt2x00dev, rt2x00dev->rx);
597 ERROR(rt2x00dev, "Queue entries allocation failed.\n");
599 rt2x00queue_uninitialize(rt2x00dev);
604 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
606 struct data_queue *queue;
608 rt2x00queue_free_skbs(rt2x00dev, rt2x00dev->rx);
610 queue_for_each(rt2x00dev, queue) {
611 kfree(queue->entries);
612 queue->entries = NULL;
616 static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
617 struct data_queue *queue, enum data_queue_qid qid)
619 spin_lock_init(&queue->lock);
621 queue->rt2x00dev = rt2x00dev;
628 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
630 struct data_queue *queue;
631 enum data_queue_qid qid;
632 unsigned int req_atim =
633 !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
636 * We need the following queues:
640 * Atim: 1 (if required)
642 rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim;
644 queue = kzalloc(rt2x00dev->data_queues * sizeof(*queue), GFP_KERNEL);
646 ERROR(rt2x00dev, "Queue allocation failed.\n");
651 * Initialize pointers
653 rt2x00dev->rx = queue;
654 rt2x00dev->tx = &queue[1];
655 rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues];
658 * Initialize queue parameters.
660 * TX: qid = QID_AC_BE + index
661 * TX: cw_min: 2^5 = 32.
662 * TX: cw_max: 2^10 = 1024.
663 * BCN: qid = QID_BEACON
664 * ATIM: qid = QID_ATIM
666 rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
669 tx_queue_for_each(rt2x00dev, queue)
670 rt2x00queue_init(rt2x00dev, queue, qid++);
672 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[0], QID_BEACON);
674 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[1], QID_ATIM);
679 void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
681 kfree(rt2x00dev->rx);
682 rt2x00dev->rx = NULL;
683 rt2x00dev->tx = NULL;
684 rt2x00dev->bcn = NULL;