2 Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
3 Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
4 Copyright (C) 2004 - 2009 Gertjan van Wingerde <gwingerde@gmail.com>
5 <http://rt2x00.serialmonkey.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the
19 Free Software Foundation, Inc.,
20 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 Abstract: rt2x00 queue specific routines.
28 #include <linux/slab.h>
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/dma-mapping.h>
34 #include "rt2x00lib.h"
36 struct sk_buff *rt2x00queue_alloc_rxskb(struct queue_entry *entry)
38 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
40 struct skb_frame_desc *skbdesc;
41 unsigned int frame_size;
42 unsigned int head_size = 0;
43 unsigned int tail_size = 0;
46 * The frame size includes descriptor size, because the
47 * hardware directly receive the frame into the skbuffer.
49 frame_size = entry->queue->data_size + entry->queue->desc_size;
52 * The payload should be aligned to a 4-byte boundary,
53 * this means we need at least 3 bytes for moving the frame
54 * into the correct offset.
59 * For IV/EIV/ICV assembly we must make sure there is
60 * at least 8 bytes bytes available in headroom for IV/EIV
61 * and 8 bytes for ICV data as tailroon.
63 if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags)) {
71 skb = dev_alloc_skb(frame_size + head_size + tail_size);
76 * Make sure we not have a frame with the requested bytes
77 * available in the head and tail.
79 skb_reserve(skb, head_size);
80 skb_put(skb, frame_size);
85 skbdesc = get_skb_frame_desc(skb);
86 memset(skbdesc, 0, sizeof(*skbdesc));
87 skbdesc->entry = entry;
89 if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags)) {
90 skbdesc->skb_dma = dma_map_single(rt2x00dev->dev,
94 skbdesc->flags |= SKBDESC_DMA_MAPPED_RX;
100 void rt2x00queue_map_txskb(struct queue_entry *entry)
102 struct device *dev = entry->queue->rt2x00dev->dev;
103 struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
106 dma_map_single(dev, entry->skb->data, entry->skb->len, DMA_TO_DEVICE);
107 skbdesc->flags |= SKBDESC_DMA_MAPPED_TX;
109 EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb);
111 void rt2x00queue_unmap_skb(struct queue_entry *entry)
113 struct device *dev = entry->queue->rt2x00dev->dev;
114 struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
116 if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) {
117 dma_unmap_single(dev, skbdesc->skb_dma, entry->skb->len,
119 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_RX;
120 } else if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) {
121 dma_unmap_single(dev, skbdesc->skb_dma, entry->skb->len,
123 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX;
126 EXPORT_SYMBOL_GPL(rt2x00queue_unmap_skb);
128 void rt2x00queue_free_skb(struct queue_entry *entry)
133 rt2x00queue_unmap_skb(entry);
134 dev_kfree_skb_any(entry->skb);
138 void rt2x00queue_align_frame(struct sk_buff *skb)
140 unsigned int frame_length = skb->len;
141 unsigned int align = ALIGN_SIZE(skb, 0);
146 skb_push(skb, align);
147 memmove(skb->data, skb->data + align, frame_length);
148 skb_trim(skb, frame_length);
151 void rt2x00queue_align_payload(struct sk_buff *skb, unsigned int header_length)
153 unsigned int frame_length = skb->len;
154 unsigned int align = ALIGN_SIZE(skb, header_length);
159 skb_push(skb, align);
160 memmove(skb->data, skb->data + align, frame_length);
161 skb_trim(skb, frame_length);
164 void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int header_length)
166 unsigned int payload_length = skb->len - header_length;
167 unsigned int header_align = ALIGN_SIZE(skb, 0);
168 unsigned int payload_align = ALIGN_SIZE(skb, header_length);
169 unsigned int l2pad = payload_length ? L2PAD_SIZE(header_length) : 0;
172 * Adjust the header alignment if the payload needs to be moved more
175 if (payload_align > header_align)
178 /* There is nothing to do if no alignment is needed */
182 /* Reserve the amount of space needed in front of the frame */
183 skb_push(skb, header_align);
188 memmove(skb->data, skb->data + header_align, header_length);
190 /* Move the payload, if present and if required */
191 if (payload_length && payload_align)
192 memmove(skb->data + header_length + l2pad,
193 skb->data + header_length + l2pad + payload_align,
196 /* Trim the skb to the correct size */
197 skb_trim(skb, header_length + l2pad + payload_length);
200 void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length)
202 unsigned int l2pad = L2PAD_SIZE(header_length);
207 memmove(skb->data + l2pad, skb->data, header_length);
208 skb_pull(skb, l2pad);
211 static void rt2x00queue_create_tx_descriptor_seq(struct queue_entry *entry,
212 struct txentry_desc *txdesc)
214 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
215 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
216 struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
217 unsigned long irqflags;
219 if (!(tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) ||
220 unlikely(!tx_info->control.vif))
224 * Hardware should insert sequence counter.
225 * FIXME: We insert a software sequence counter first for
226 * hardware that doesn't support hardware sequence counting.
228 * This is wrong because beacons are not getting sequence
229 * numbers assigned properly.
231 * A secondary problem exists for drivers that cannot toggle
232 * sequence counting per-frame, since those will override the
233 * sequence counter given by mac80211.
235 spin_lock_irqsave(&intf->seqlock, irqflags);
237 if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
239 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
240 hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
242 spin_unlock_irqrestore(&intf->seqlock, irqflags);
244 __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
247 static void rt2x00queue_create_tx_descriptor_plcp(struct queue_entry *entry,
248 struct txentry_desc *txdesc,
249 const struct rt2x00_rate *hwrate)
251 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
252 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
253 struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
254 unsigned int data_length;
255 unsigned int duration;
256 unsigned int residual;
258 /* Data length + CRC + Crypto overhead (IV/EIV/ICV/MIC) */
259 data_length = entry->skb->len + 4;
260 data_length += rt2x00crypto_tx_overhead(rt2x00dev, entry->skb);
264 * Length calculation depends on OFDM/CCK rate.
266 txdesc->signal = hwrate->plcp;
267 txdesc->service = 0x04;
269 if (hwrate->flags & DEV_RATE_OFDM) {
270 txdesc->length_high = (data_length >> 6) & 0x3f;
271 txdesc->length_low = data_length & 0x3f;
274 * Convert length to microseconds.
276 residual = GET_DURATION_RES(data_length, hwrate->bitrate);
277 duration = GET_DURATION(data_length, hwrate->bitrate);
283 * Check if we need to set the Length Extension
285 if (hwrate->bitrate == 110 && residual <= 30)
286 txdesc->service |= 0x80;
289 txdesc->length_high = (duration >> 8) & 0xff;
290 txdesc->length_low = duration & 0xff;
293 * When preamble is enabled we should set the
294 * preamble bit for the signal.
296 if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
297 txdesc->signal |= 0x08;
301 static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
302 struct txentry_desc *txdesc)
304 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
305 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
306 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
307 struct ieee80211_rate *rate =
308 ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
309 const struct rt2x00_rate *hwrate;
311 memset(txdesc, 0, sizeof(*txdesc));
314 * Initialize information from queue
316 txdesc->qid = entry->queue->qid;
317 txdesc->cw_min = entry->queue->cw_min;
318 txdesc->cw_max = entry->queue->cw_max;
319 txdesc->aifs = entry->queue->aifs;
322 * Header and frame information.
324 txdesc->length = entry->skb->len;
325 txdesc->header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
328 * Check whether this frame is to be acked.
330 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
331 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
334 * Check if this is a RTS/CTS frame
336 if (ieee80211_is_rts(hdr->frame_control) ||
337 ieee80211_is_cts(hdr->frame_control)) {
338 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
339 if (ieee80211_is_rts(hdr->frame_control))
340 __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
342 __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
343 if (tx_info->control.rts_cts_rate_idx >= 0)
345 ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
349 * Determine retry information.
351 txdesc->retry_limit = tx_info->control.rates[0].count - 1;
352 if (txdesc->retry_limit >= rt2x00dev->long_retry)
353 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
356 * Check if more fragments are pending
358 if (ieee80211_has_morefrags(hdr->frame_control)) {
359 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
360 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
364 * Check if more frames (!= fragments) are pending
366 if (tx_info->flags & IEEE80211_TX_CTL_MORE_FRAMES)
367 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
370 * Beacons and probe responses require the tsf timestamp
371 * to be inserted into the frame, except for a frame that has been injected
372 * through a monitor interface. This latter is needed for testing a
375 if ((ieee80211_is_beacon(hdr->frame_control) ||
376 ieee80211_is_probe_resp(hdr->frame_control)) &&
377 (!(tx_info->flags & IEEE80211_TX_CTL_INJECTED)))
378 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
381 * Determine with what IFS priority this frame should be send.
382 * Set ifs to IFS_SIFS when the this is not the first fragment,
383 * or this fragment came after RTS/CTS.
385 if ((tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) &&
386 !test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) {
387 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
388 txdesc->ifs = IFS_BACKOFF;
390 txdesc->ifs = IFS_SIFS;
393 * Determine rate modulation.
395 hwrate = rt2x00_get_rate(rate->hw_value);
396 txdesc->rate_mode = RATE_MODE_CCK;
397 if (hwrate->flags & DEV_RATE_OFDM)
398 txdesc->rate_mode = RATE_MODE_OFDM;
401 * Apply TX descriptor handling by components
403 rt2x00crypto_create_tx_descriptor(entry, txdesc);
404 rt2x00ht_create_tx_descriptor(entry, txdesc, hwrate);
405 rt2x00queue_create_tx_descriptor_seq(entry, txdesc);
406 rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, hwrate);
409 static int rt2x00queue_write_tx_data(struct queue_entry *entry,
410 struct txentry_desc *txdesc)
412 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
415 * This should not happen, we already checked the entry
416 * was ours. When the hardware disagrees there has been
417 * a queue corruption!
419 if (unlikely(rt2x00dev->ops->lib->get_entry_state &&
420 rt2x00dev->ops->lib->get_entry_state(entry))) {
422 "Corrupt queue %d, accessing entry which is not ours.\n"
423 "Please file bug report to %s.\n",
424 entry->queue->qid, DRV_PROJECT);
429 * Add the requested extra tx headroom in front of the skb.
431 skb_push(entry->skb, rt2x00dev->ops->extra_tx_headroom);
432 memset(entry->skb->data, 0, rt2x00dev->ops->extra_tx_headroom);
435 * Call the driver's write_tx_data function, if it exists.
437 if (rt2x00dev->ops->lib->write_tx_data)
438 rt2x00dev->ops->lib->write_tx_data(entry, txdesc);
441 * Map the skb to DMA.
443 if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
444 rt2x00queue_map_txskb(entry);
449 static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
450 struct txentry_desc *txdesc)
452 struct data_queue *queue = entry->queue;
454 queue->rt2x00dev->ops->lib->write_tx_desc(entry, txdesc);
457 * All processing on the frame has been completed, this means
458 * it is now ready to be dumped to userspace through debugfs.
460 rt2x00debug_dump_frame(queue->rt2x00dev, DUMP_FRAME_TX, entry->skb);
463 static void rt2x00queue_kick_tx_queue(struct queue_entry *entry,
464 struct txentry_desc *txdesc)
466 struct data_queue *queue = entry->queue;
467 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
470 * Check if we need to kick the queue, there are however a few rules
471 * 1) Don't kick unless this is the last in frame in a burst.
472 * When the burst flag is set, this frame is always followed
473 * by another frame which in some way are related to eachother.
474 * This is true for fragments, RTS or CTS-to-self frames.
475 * 2) Rule 1 can be broken when the available entries
476 * in the queue are less then a certain threshold.
478 if (rt2x00queue_threshold(queue) ||
479 !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
480 rt2x00dev->ops->lib->kick_tx_queue(queue);
483 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
486 struct ieee80211_tx_info *tx_info;
487 struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
488 struct txentry_desc txdesc;
489 struct skb_frame_desc *skbdesc;
490 u8 rate_idx, rate_flags;
492 if (unlikely(rt2x00queue_full(queue)))
495 if (unlikely(test_and_set_bit(ENTRY_OWNER_DEVICE_DATA,
497 ERROR(queue->rt2x00dev,
498 "Arrived at non-free entry in the non-full queue %d.\n"
499 "Please file bug report to %s.\n",
500 queue->qid, DRV_PROJECT);
505 * Copy all TX descriptor information into txdesc,
506 * after that we are free to use the skb->cb array
507 * for our information.
510 rt2x00queue_create_tx_descriptor(entry, &txdesc);
513 * All information is retrieved from the skb->cb array,
514 * now we should claim ownership of the driver part of that
515 * array, preserving the bitrate index and flags.
517 tx_info = IEEE80211_SKB_CB(skb);
518 rate_idx = tx_info->control.rates[0].idx;
519 rate_flags = tx_info->control.rates[0].flags;
520 skbdesc = get_skb_frame_desc(skb);
521 memset(skbdesc, 0, sizeof(*skbdesc));
522 skbdesc->entry = entry;
523 skbdesc->tx_rate_idx = rate_idx;
524 skbdesc->tx_rate_flags = rate_flags;
527 skbdesc->flags |= SKBDESC_NOT_MAC80211;
530 * When hardware encryption is supported, and this frame
531 * is to be encrypted, we should strip the IV/EIV data from
532 * the frame so we can provide it to the driver separately.
534 if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
535 !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) {
536 if (test_bit(DRIVER_REQUIRE_COPY_IV, &queue->rt2x00dev->flags))
537 rt2x00crypto_tx_copy_iv(skb, &txdesc);
539 rt2x00crypto_tx_remove_iv(skb, &txdesc);
543 * When DMA allocation is required we should guarentee to the
544 * driver that the DMA is aligned to a 4-byte boundary.
545 * However some drivers require L2 padding to pad the payload
546 * rather then the header. This could be a requirement for
547 * PCI and USB devices, while header alignment only is valid
550 if (test_bit(DRIVER_REQUIRE_L2PAD, &queue->rt2x00dev->flags))
551 rt2x00queue_insert_l2pad(entry->skb, txdesc.header_length);
552 else if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
553 rt2x00queue_align_frame(entry->skb);
556 * It could be possible that the queue was corrupted and this
557 * call failed. Since we always return NETDEV_TX_OK to mac80211,
558 * this frame will simply be dropped.
560 if (unlikely(rt2x00queue_write_tx_data(entry, &txdesc))) {
561 clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
566 set_bit(ENTRY_DATA_PENDING, &entry->flags);
568 rt2x00queue_index_inc(queue, Q_INDEX);
569 rt2x00queue_write_tx_descriptor(entry, &txdesc);
570 rt2x00queue_kick_tx_queue(entry, &txdesc);
575 int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
576 struct ieee80211_vif *vif,
577 const bool enable_beacon)
579 struct rt2x00_intf *intf = vif_to_intf(vif);
580 struct skb_frame_desc *skbdesc;
581 struct txentry_desc txdesc;
583 if (unlikely(!intf->beacon))
586 mutex_lock(&intf->beacon_skb_mutex);
589 * Clean up the beacon skb.
591 rt2x00queue_free_skb(intf->beacon);
593 if (!enable_beacon) {
594 rt2x00dev->ops->lib->kill_tx_queue(intf->beacon->queue);
595 mutex_unlock(&intf->beacon_skb_mutex);
599 intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
600 if (!intf->beacon->skb) {
601 mutex_unlock(&intf->beacon_skb_mutex);
606 * Copy all TX descriptor information into txdesc,
607 * after that we are free to use the skb->cb array
608 * for our information.
610 rt2x00queue_create_tx_descriptor(intf->beacon, &txdesc);
613 * Fill in skb descriptor
615 skbdesc = get_skb_frame_desc(intf->beacon->skb);
616 memset(skbdesc, 0, sizeof(*skbdesc));
617 skbdesc->entry = intf->beacon;
620 * Send beacon to hardware and enable beacon genaration..
622 rt2x00dev->ops->lib->write_beacon(intf->beacon, &txdesc);
624 mutex_unlock(&intf->beacon_skb_mutex);
629 void rt2x00queue_for_each_entry(struct data_queue *queue,
630 enum queue_index start,
631 enum queue_index end,
632 void (*fn)(struct queue_entry *entry))
634 unsigned long irqflags;
635 unsigned int index_start;
636 unsigned int index_end;
639 if (unlikely(start >= Q_INDEX_MAX || end >= Q_INDEX_MAX)) {
640 ERROR(queue->rt2x00dev,
641 "Entry requested from invalid index range (%d - %d)\n",
647 * Only protect the range we are going to loop over,
648 * if during our loop a extra entry is set to pending
649 * it should not be kicked during this run, since it
650 * is part of another TX operation.
652 spin_lock_irqsave(&queue->lock, irqflags);
653 index_start = queue->index[start];
654 index_end = queue->index[end];
655 spin_unlock_irqrestore(&queue->lock, irqflags);
658 * Start from the TX done pointer, this guarentees that we will
659 * send out all frames in the correct order.
661 if (index_start < index_end) {
662 for (i = index_start; i < index_end; i++)
663 fn(&queue->entries[i]);
665 for (i = index_start; i < queue->limit; i++)
666 fn(&queue->entries[i]);
668 for (i = 0; i < index_end; i++)
669 fn(&queue->entries[i]);
672 EXPORT_SYMBOL_GPL(rt2x00queue_for_each_entry);
674 struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
675 const enum data_queue_qid queue)
677 int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
680 return rt2x00dev->rx;
682 if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx)
683 return &rt2x00dev->tx[queue];
688 if (queue == QID_BEACON)
689 return &rt2x00dev->bcn[0];
690 else if (queue == QID_ATIM && atim)
691 return &rt2x00dev->bcn[1];
695 EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
697 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
698 enum queue_index index)
700 struct queue_entry *entry;
701 unsigned long irqflags;
703 if (unlikely(index >= Q_INDEX_MAX)) {
704 ERROR(queue->rt2x00dev,
705 "Entry requested from invalid index type (%d)\n", index);
709 spin_lock_irqsave(&queue->lock, irqflags);
711 entry = &queue->entries[queue->index[index]];
713 spin_unlock_irqrestore(&queue->lock, irqflags);
717 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
719 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
721 unsigned long irqflags;
723 if (unlikely(index >= Q_INDEX_MAX)) {
724 ERROR(queue->rt2x00dev,
725 "Index change on invalid index type (%d)\n", index);
729 spin_lock_irqsave(&queue->lock, irqflags);
731 queue->index[index]++;
732 if (queue->index[index] >= queue->limit)
733 queue->index[index] = 0;
735 queue->last_action[index] = jiffies;
737 if (index == Q_INDEX) {
739 } else if (index == Q_INDEX_DONE) {
744 spin_unlock_irqrestore(&queue->lock, irqflags);
747 static void rt2x00queue_reset(struct data_queue *queue)
749 unsigned long irqflags;
752 spin_lock_irqsave(&queue->lock, irqflags);
757 for (i = 0; i < Q_INDEX_MAX; i++) {
759 queue->last_action[i] = jiffies;
762 spin_unlock_irqrestore(&queue->lock, irqflags);
765 void rt2x00queue_stop_queues(struct rt2x00_dev *rt2x00dev)
767 struct data_queue *queue;
769 txall_queue_for_each(rt2x00dev, queue)
770 rt2x00dev->ops->lib->kill_tx_queue(queue);
773 void rt2x00queue_init_queues(struct rt2x00_dev *rt2x00dev)
775 struct data_queue *queue;
778 queue_for_each(rt2x00dev, queue) {
779 rt2x00queue_reset(queue);
781 for (i = 0; i < queue->limit; i++) {
782 rt2x00dev->ops->lib->clear_entry(&queue->entries[i]);
783 if (queue->qid == QID_RX)
784 rt2x00queue_index_inc(queue, Q_INDEX);
789 static int rt2x00queue_alloc_entries(struct data_queue *queue,
790 const struct data_queue_desc *qdesc)
792 struct queue_entry *entries;
793 unsigned int entry_size;
796 rt2x00queue_reset(queue);
798 queue->limit = qdesc->entry_num;
799 queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
800 queue->data_size = qdesc->data_size;
801 queue->desc_size = qdesc->desc_size;
804 * Allocate all queue entries.
806 entry_size = sizeof(*entries) + qdesc->priv_size;
807 entries = kcalloc(queue->limit, entry_size, GFP_KERNEL);
811 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
812 ( ((char *)(__base)) + ((__limit) * (__esize)) + \
813 ((__index) * (__psize)) )
815 for (i = 0; i < queue->limit; i++) {
816 entries[i].flags = 0;
817 entries[i].queue = queue;
818 entries[i].skb = NULL;
819 entries[i].entry_idx = i;
820 entries[i].priv_data =
821 QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
822 sizeof(*entries), qdesc->priv_size);
825 #undef QUEUE_ENTRY_PRIV_OFFSET
827 queue->entries = entries;
832 static void rt2x00queue_free_skbs(struct data_queue *queue)
839 for (i = 0; i < queue->limit; i++) {
840 rt2x00queue_free_skb(&queue->entries[i]);
844 static int rt2x00queue_alloc_rxskbs(struct data_queue *queue)
849 for (i = 0; i < queue->limit; i++) {
850 skb = rt2x00queue_alloc_rxskb(&queue->entries[i]);
853 queue->entries[i].skb = skb;
859 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
861 struct data_queue *queue;
864 status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
868 tx_queue_for_each(rt2x00dev, queue) {
869 status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
874 status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
878 if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) {
879 status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1],
880 rt2x00dev->ops->atim);
885 status = rt2x00queue_alloc_rxskbs(rt2x00dev->rx);
892 ERROR(rt2x00dev, "Queue entries allocation failed.\n");
894 rt2x00queue_uninitialize(rt2x00dev);
899 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
901 struct data_queue *queue;
903 rt2x00queue_free_skbs(rt2x00dev->rx);
905 queue_for_each(rt2x00dev, queue) {
906 kfree(queue->entries);
907 queue->entries = NULL;
911 static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
912 struct data_queue *queue, enum data_queue_qid qid)
914 spin_lock_init(&queue->lock);
916 queue->rt2x00dev = rt2x00dev;
924 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
926 struct data_queue *queue;
927 enum data_queue_qid qid;
928 unsigned int req_atim =
929 !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
932 * We need the following queues:
936 * Atim: 1 (if required)
938 rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim;
940 queue = kcalloc(rt2x00dev->data_queues, sizeof(*queue), GFP_KERNEL);
942 ERROR(rt2x00dev, "Queue allocation failed.\n");
947 * Initialize pointers
949 rt2x00dev->rx = queue;
950 rt2x00dev->tx = &queue[1];
951 rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues];
954 * Initialize queue parameters.
956 * TX: qid = QID_AC_BE + index
957 * TX: cw_min: 2^5 = 32.
958 * TX: cw_max: 2^10 = 1024.
959 * BCN: qid = QID_BEACON
960 * ATIM: qid = QID_ATIM
962 rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
965 tx_queue_for_each(rt2x00dev, queue)
966 rt2x00queue_init(rt2x00dev, queue, qid++);
968 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[0], QID_BEACON);
970 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[1], QID_ATIM);
975 void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
977 kfree(rt2x00dev->rx);
978 rt2x00dev->rx = NULL;
979 rt2x00dev->tx = NULL;
980 rt2x00dev->bcn = NULL;