2 Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
3 Copyright (C) 2004 - 2009 Gertjan van Wingerde <gwingerde@gmail.com>
4 <http://rt2x00.serialmonkey.com>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the
18 Free Software Foundation, Inc.,
19 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 Abstract: rt2x00 queue specific routines.
27 #include <linux/slab.h>
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/dma-mapping.h>
33 #include "rt2x00lib.h"
35 struct sk_buff *rt2x00queue_alloc_rxskb(struct rt2x00_dev *rt2x00dev,
36 struct queue_entry *entry)
39 struct skb_frame_desc *skbdesc;
40 unsigned int frame_size;
41 unsigned int head_size = 0;
42 unsigned int tail_size = 0;
45 * The frame size includes descriptor size, because the
46 * hardware directly receive the frame into the skbuffer.
48 frame_size = entry->queue->data_size + entry->queue->desc_size;
51 * The payload should be aligned to a 4-byte boundary,
52 * this means we need at least 3 bytes for moving the frame
53 * into the correct offset.
58 * For IV/EIV/ICV assembly we must make sure there is
59 * at least 8 bytes bytes available in headroom for IV/EIV
60 * and 8 bytes for ICV data as tailroon.
62 if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags)) {
70 skb = dev_alloc_skb(frame_size + head_size + tail_size);
75 * Make sure we not have a frame with the requested bytes
76 * available in the head and tail.
78 skb_reserve(skb, head_size);
79 skb_put(skb, frame_size);
84 skbdesc = get_skb_frame_desc(skb);
85 memset(skbdesc, 0, sizeof(*skbdesc));
86 skbdesc->entry = entry;
88 if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags)) {
89 skbdesc->skb_dma = dma_map_single(rt2x00dev->dev,
93 skbdesc->flags |= SKBDESC_DMA_MAPPED_RX;
99 void rt2x00queue_map_txskb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
101 struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
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.
108 skb_push(skb, rt2x00dev->ops->extra_tx_headroom);
111 dma_map_single(rt2x00dev->dev, skb->data, skb->len, DMA_TO_DEVICE);
114 * Restore data pointer to original location again.
116 skb_pull(skb, rt2x00dev->ops->extra_tx_headroom);
118 skbdesc->flags |= SKBDESC_DMA_MAPPED_TX;
120 EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb);
122 void rt2x00queue_unmap_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
124 struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
126 if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) {
127 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
129 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_RX;
132 if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) {
134 * Add headroom to the skb length, it has been removed
135 * by the driver, but it was actually mapped to DMA.
137 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma,
138 skb->len + rt2x00dev->ops->extra_tx_headroom,
140 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX;
144 void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
149 rt2x00queue_unmap_skb(rt2x00dev, skb);
150 dev_kfree_skb_any(skb);
153 void rt2x00queue_align_frame(struct sk_buff *skb)
155 unsigned int frame_length = skb->len;
156 unsigned int align = ALIGN_SIZE(skb, 0);
161 skb_push(skb, align);
162 memmove(skb->data, skb->data + align, frame_length);
163 skb_trim(skb, frame_length);
166 void rt2x00queue_align_payload(struct sk_buff *skb, unsigned int header_length)
168 unsigned int frame_length = skb->len;
169 unsigned int align = ALIGN_SIZE(skb, header_length);
174 skb_push(skb, align);
175 memmove(skb->data, skb->data + align, frame_length);
176 skb_trim(skb, frame_length);
179 void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int header_length)
181 unsigned int payload_length = skb->len - header_length;
182 unsigned int header_align = ALIGN_SIZE(skb, 0);
183 unsigned int payload_align = ALIGN_SIZE(skb, header_length);
184 unsigned int l2pad = payload_length ? L2PAD_SIZE(header_length) : 0;
187 * Adjust the header alignment if the payload needs to be moved more
190 if (payload_align > header_align)
193 /* There is nothing to do if no alignment is needed */
197 /* Reserve the amount of space needed in front of the frame */
198 skb_push(skb, header_align);
203 memmove(skb->data, skb->data + header_align, header_length);
205 /* Move the payload, if present and if required */
206 if (payload_length && payload_align)
207 memmove(skb->data + header_length + l2pad,
208 skb->data + header_length + l2pad + payload_align,
211 /* Trim the skb to the correct size */
212 skb_trim(skb, header_length + l2pad + payload_length);
215 void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length)
217 unsigned int l2pad = L2PAD_SIZE(header_length);
222 memmove(skb->data + l2pad, skb->data, header_length);
223 skb_pull(skb, l2pad);
226 static void rt2x00queue_create_tx_descriptor_seq(struct queue_entry *entry,
227 struct txentry_desc *txdesc)
229 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
230 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
231 struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
232 unsigned long irqflags;
234 if (!(tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) ||
235 unlikely(!tx_info->control.vif))
239 * Hardware should insert sequence counter.
240 * FIXME: We insert a software sequence counter first for
241 * hardware that doesn't support hardware sequence counting.
243 * This is wrong because beacons are not getting sequence
244 * numbers assigned properly.
246 * A secondary problem exists for drivers that cannot toggle
247 * sequence counting per-frame, since those will override the
248 * sequence counter given by mac80211.
250 spin_lock_irqsave(&intf->seqlock, irqflags);
252 if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
254 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
255 hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
257 spin_unlock_irqrestore(&intf->seqlock, irqflags);
259 __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
262 static void rt2x00queue_create_tx_descriptor_plcp(struct queue_entry *entry,
263 struct txentry_desc *txdesc,
264 const struct rt2x00_rate *hwrate)
266 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
267 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
268 struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
269 unsigned int data_length;
270 unsigned int duration;
271 unsigned int residual;
273 /* Data length + CRC + Crypto overhead (IV/EIV/ICV/MIC) */
274 data_length = entry->skb->len + 4;
275 data_length += rt2x00crypto_tx_overhead(rt2x00dev, entry->skb);
279 * Length calculation depends on OFDM/CCK rate.
281 txdesc->signal = hwrate->plcp;
282 txdesc->service = 0x04;
284 if (hwrate->flags & DEV_RATE_OFDM) {
285 txdesc->length_high = (data_length >> 6) & 0x3f;
286 txdesc->length_low = data_length & 0x3f;
289 * Convert length to microseconds.
291 residual = GET_DURATION_RES(data_length, hwrate->bitrate);
292 duration = GET_DURATION(data_length, hwrate->bitrate);
298 * Check if we need to set the Length Extension
300 if (hwrate->bitrate == 110 && residual <= 30)
301 txdesc->service |= 0x80;
304 txdesc->length_high = (duration >> 8) & 0xff;
305 txdesc->length_low = duration & 0xff;
308 * When preamble is enabled we should set the
309 * preamble bit for the signal.
311 if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
312 txdesc->signal |= 0x08;
316 static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
317 struct txentry_desc *txdesc)
319 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
320 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
321 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
322 struct ieee80211_rate *rate =
323 ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
324 const struct rt2x00_rate *hwrate;
326 memset(txdesc, 0, sizeof(*txdesc));
329 * Initialize information from queue
331 txdesc->queue = entry->queue->qid;
332 txdesc->cw_min = entry->queue->cw_min;
333 txdesc->cw_max = entry->queue->cw_max;
334 txdesc->aifs = entry->queue->aifs;
337 * Header and frame information.
339 txdesc->length = entry->skb->len;
340 txdesc->header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
343 * Check whether this frame is to be acked.
345 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
346 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
349 * Check if this is a RTS/CTS frame
351 if (ieee80211_is_rts(hdr->frame_control) ||
352 ieee80211_is_cts(hdr->frame_control)) {
353 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
354 if (ieee80211_is_rts(hdr->frame_control))
355 __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
357 __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
358 if (tx_info->control.rts_cts_rate_idx >= 0)
360 ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
364 * Determine retry information.
366 txdesc->retry_limit = tx_info->control.rates[0].count - 1;
367 if (txdesc->retry_limit >= rt2x00dev->long_retry)
368 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
371 * Check if more fragments are pending
373 if (ieee80211_has_morefrags(hdr->frame_control) ||
374 (tx_info->flags & IEEE80211_TX_CTL_MORE_FRAMES)) {
375 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
376 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
380 * Beacons and probe responses require the tsf timestamp
381 * to be inserted into the frame, except for a frame that has been injected
382 * through a monitor interface. This latter is needed for testing a
385 if ((ieee80211_is_beacon(hdr->frame_control) ||
386 ieee80211_is_probe_resp(hdr->frame_control)) &&
387 (!(tx_info->flags & IEEE80211_TX_CTL_INJECTED)))
388 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
391 * Determine with what IFS priority this frame should be send.
392 * Set ifs to IFS_SIFS when the this is not the first fragment,
393 * or this fragment came after RTS/CTS.
395 if ((tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) &&
396 !test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) {
397 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
398 txdesc->ifs = IFS_BACKOFF;
400 txdesc->ifs = IFS_SIFS;
403 * Determine rate modulation.
405 hwrate = rt2x00_get_rate(rate->hw_value);
406 txdesc->rate_mode = RATE_MODE_CCK;
407 if (hwrate->flags & DEV_RATE_OFDM)
408 txdesc->rate_mode = RATE_MODE_OFDM;
411 * Apply TX descriptor handling by components
413 rt2x00crypto_create_tx_descriptor(entry, txdesc);
414 rt2x00ht_create_tx_descriptor(entry, txdesc, hwrate);
415 rt2x00queue_create_tx_descriptor_seq(entry, txdesc);
416 rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, hwrate);
419 static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
420 struct txentry_desc *txdesc)
422 struct data_queue *queue = entry->queue;
423 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
424 enum rt2x00_dump_type dump_type;
426 rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, entry->skb, txdesc);
429 * All processing on the frame has been completed, this means
430 * it is now ready to be dumped to userspace through debugfs.
432 dump_type = (txdesc->queue == QID_BEACON) ?
433 DUMP_FRAME_BEACON : DUMP_FRAME_TX;
434 rt2x00debug_dump_frame(rt2x00dev, dump_type, entry->skb);
437 static void rt2x00queue_kick_tx_queue(struct queue_entry *entry,
438 struct txentry_desc *txdesc)
440 struct data_queue *queue = entry->queue;
441 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
444 * Check if we need to kick the queue, there are however a few rules
445 * 1) Don't kick unless this is the last in frame in a burst.
446 * When the burst flag is set, this frame is always followed
447 * by another frame which in some way are related to eachother.
448 * This is true for fragments, RTS or CTS-to-self frames.
449 * 2) Rule 1 can be broken when the available entries
450 * in the queue are less then a certain threshold.
452 if (rt2x00queue_threshold(queue) ||
453 !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
454 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, queue->qid);
457 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
460 struct ieee80211_tx_info *tx_info;
461 struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
462 struct txentry_desc txdesc;
463 struct skb_frame_desc *skbdesc;
464 u8 rate_idx, rate_flags;
466 if (unlikely(rt2x00queue_full(queue)))
469 if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
470 ERROR(queue->rt2x00dev,
471 "Arrived at non-free entry in the non-full queue %d.\n"
472 "Please file bug report to %s.\n",
473 queue->qid, DRV_PROJECT);
478 * Copy all TX descriptor information into txdesc,
479 * after that we are free to use the skb->cb array
480 * for our information.
483 rt2x00queue_create_tx_descriptor(entry, &txdesc);
486 * All information is retrieved from the skb->cb array,
487 * now we should claim ownership of the driver part of that
488 * array, preserving the bitrate index and flags.
490 tx_info = IEEE80211_SKB_CB(skb);
491 rate_idx = tx_info->control.rates[0].idx;
492 rate_flags = tx_info->control.rates[0].flags;
493 skbdesc = get_skb_frame_desc(skb);
494 memset(skbdesc, 0, sizeof(*skbdesc));
495 skbdesc->entry = entry;
496 skbdesc->tx_rate_idx = rate_idx;
497 skbdesc->tx_rate_flags = rate_flags;
500 skbdesc->flags |= SKBDESC_NOT_MAC80211;
503 * When hardware encryption is supported, and this frame
504 * is to be encrypted, we should strip the IV/EIV data from
505 * the frame so we can provide it to the driver separately.
507 if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
508 !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) {
509 if (test_bit(DRIVER_REQUIRE_COPY_IV, &queue->rt2x00dev->flags))
510 rt2x00crypto_tx_copy_iv(skb, &txdesc);
512 rt2x00crypto_tx_remove_iv(skb, &txdesc);
516 * When DMA allocation is required we should guarentee to the
517 * driver that the DMA is aligned to a 4-byte boundary.
518 * However some drivers require L2 padding to pad the payload
519 * rather then the header. This could be a requirement for
520 * PCI and USB devices, while header alignment only is valid
523 if (test_bit(DRIVER_REQUIRE_L2PAD, &queue->rt2x00dev->flags))
524 rt2x00queue_insert_l2pad(entry->skb, txdesc.header_length);
525 else if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
526 rt2x00queue_align_frame(entry->skb);
529 * It could be possible that the queue was corrupted and this
530 * call failed. Since we always return NETDEV_TX_OK to mac80211,
531 * this frame will simply be dropped.
533 if (unlikely(queue->rt2x00dev->ops->lib->write_tx_data(entry,
535 clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
540 if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
541 rt2x00queue_map_txskb(queue->rt2x00dev, skb);
543 set_bit(ENTRY_DATA_PENDING, &entry->flags);
545 rt2x00queue_index_inc(queue, Q_INDEX);
546 rt2x00queue_write_tx_descriptor(entry, &txdesc);
547 rt2x00queue_kick_tx_queue(entry, &txdesc);
552 int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
553 struct ieee80211_vif *vif,
554 const bool enable_beacon)
556 struct rt2x00_intf *intf = vif_to_intf(vif);
557 struct skb_frame_desc *skbdesc;
558 struct txentry_desc txdesc;
560 if (unlikely(!intf->beacon))
563 mutex_lock(&intf->beacon_skb_mutex);
566 * Clean up the beacon skb.
568 rt2x00queue_free_skb(rt2x00dev, intf->beacon->skb);
569 intf->beacon->skb = NULL;
571 if (!enable_beacon) {
572 rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev, QID_BEACON);
573 mutex_unlock(&intf->beacon_skb_mutex);
577 intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
578 if (!intf->beacon->skb) {
579 mutex_unlock(&intf->beacon_skb_mutex);
584 * Copy all TX descriptor information into txdesc,
585 * after that we are free to use the skb->cb array
586 * for our information.
588 rt2x00queue_create_tx_descriptor(intf->beacon, &txdesc);
591 * Fill in skb descriptor
593 skbdesc = get_skb_frame_desc(intf->beacon->skb);
594 memset(skbdesc, 0, sizeof(*skbdesc));
595 skbdesc->entry = intf->beacon;
598 * Write TX descriptor into reserved room in front of the beacon.
600 rt2x00queue_write_tx_descriptor(intf->beacon, &txdesc);
603 * Send beacon to hardware and enable beacon genaration..
605 rt2x00dev->ops->lib->write_beacon(intf->beacon, &txdesc);
607 mutex_unlock(&intf->beacon_skb_mutex);
612 struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
613 const enum data_queue_qid queue)
615 int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
618 return rt2x00dev->rx;
620 if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx)
621 return &rt2x00dev->tx[queue];
626 if (queue == QID_BEACON)
627 return &rt2x00dev->bcn[0];
628 else if (queue == QID_ATIM && atim)
629 return &rt2x00dev->bcn[1];
633 EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
635 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
636 enum queue_index index)
638 struct queue_entry *entry;
639 unsigned long irqflags;
641 if (unlikely(index >= Q_INDEX_MAX)) {
642 ERROR(queue->rt2x00dev,
643 "Entry requested from invalid index type (%d)\n", index);
647 spin_lock_irqsave(&queue->lock, irqflags);
649 entry = &queue->entries[queue->index[index]];
651 spin_unlock_irqrestore(&queue->lock, irqflags);
655 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
657 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
659 unsigned long irqflags;
661 if (unlikely(index >= Q_INDEX_MAX)) {
662 ERROR(queue->rt2x00dev,
663 "Index change on invalid index type (%d)\n", index);
667 spin_lock_irqsave(&queue->lock, irqflags);
669 queue->index[index]++;
670 if (queue->index[index] >= queue->limit)
671 queue->index[index] = 0;
673 if (index == Q_INDEX) {
675 } else if (index == Q_INDEX_DONE) {
680 spin_unlock_irqrestore(&queue->lock, irqflags);
683 static void rt2x00queue_reset(struct data_queue *queue)
685 unsigned long irqflags;
687 spin_lock_irqsave(&queue->lock, irqflags);
691 memset(queue->index, 0, sizeof(queue->index));
693 spin_unlock_irqrestore(&queue->lock, irqflags);
696 void rt2x00queue_stop_queues(struct rt2x00_dev *rt2x00dev)
698 struct data_queue *queue;
700 txall_queue_for_each(rt2x00dev, queue)
701 rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev, queue->qid);
704 void rt2x00queue_init_queues(struct rt2x00_dev *rt2x00dev)
706 struct data_queue *queue;
709 queue_for_each(rt2x00dev, queue) {
710 rt2x00queue_reset(queue);
712 for (i = 0; i < queue->limit; i++) {
713 queue->entries[i].flags = 0;
715 rt2x00dev->ops->lib->clear_entry(&queue->entries[i]);
720 static int rt2x00queue_alloc_entries(struct data_queue *queue,
721 const struct data_queue_desc *qdesc)
723 struct queue_entry *entries;
724 unsigned int entry_size;
727 rt2x00queue_reset(queue);
729 queue->limit = qdesc->entry_num;
730 queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
731 queue->data_size = qdesc->data_size;
732 queue->desc_size = qdesc->desc_size;
735 * Allocate all queue entries.
737 entry_size = sizeof(*entries) + qdesc->priv_size;
738 entries = kzalloc(queue->limit * entry_size, GFP_KERNEL);
742 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
743 ( ((char *)(__base)) + ((__limit) * (__esize)) + \
744 ((__index) * (__psize)) )
746 for (i = 0; i < queue->limit; i++) {
747 entries[i].flags = 0;
748 entries[i].queue = queue;
749 entries[i].skb = NULL;
750 entries[i].entry_idx = i;
751 entries[i].priv_data =
752 QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
753 sizeof(*entries), qdesc->priv_size);
756 #undef QUEUE_ENTRY_PRIV_OFFSET
758 queue->entries = entries;
763 static void rt2x00queue_free_skbs(struct rt2x00_dev *rt2x00dev,
764 struct data_queue *queue)
771 for (i = 0; i < queue->limit; i++) {
772 if (queue->entries[i].skb)
773 rt2x00queue_free_skb(rt2x00dev, queue->entries[i].skb);
777 static int rt2x00queue_alloc_rxskbs(struct rt2x00_dev *rt2x00dev,
778 struct data_queue *queue)
783 for (i = 0; i < queue->limit; i++) {
784 skb = rt2x00queue_alloc_rxskb(rt2x00dev, &queue->entries[i]);
787 queue->entries[i].skb = skb;
793 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
795 struct data_queue *queue;
798 status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
802 tx_queue_for_each(rt2x00dev, queue) {
803 status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
808 status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
812 if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) {
813 status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1],
814 rt2x00dev->ops->atim);
819 status = rt2x00queue_alloc_rxskbs(rt2x00dev, rt2x00dev->rx);
826 ERROR(rt2x00dev, "Queue entries allocation failed.\n");
828 rt2x00queue_uninitialize(rt2x00dev);
833 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
835 struct data_queue *queue;
837 rt2x00queue_free_skbs(rt2x00dev, rt2x00dev->rx);
839 queue_for_each(rt2x00dev, queue) {
840 kfree(queue->entries);
841 queue->entries = NULL;
845 static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
846 struct data_queue *queue, enum data_queue_qid qid)
848 spin_lock_init(&queue->lock);
850 queue->rt2x00dev = rt2x00dev;
858 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
860 struct data_queue *queue;
861 enum data_queue_qid qid;
862 unsigned int req_atim =
863 !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
866 * We need the following queues:
870 * Atim: 1 (if required)
872 rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim;
874 queue = kzalloc(rt2x00dev->data_queues * sizeof(*queue), GFP_KERNEL);
876 ERROR(rt2x00dev, "Queue allocation failed.\n");
881 * Initialize pointers
883 rt2x00dev->rx = queue;
884 rt2x00dev->tx = &queue[1];
885 rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues];
888 * Initialize queue parameters.
890 * TX: qid = QID_AC_BE + index
891 * TX: cw_min: 2^5 = 32.
892 * TX: cw_max: 2^10 = 1024.
893 * BCN: qid = QID_BEACON
894 * ATIM: qid = QID_ATIM
896 rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
899 tx_queue_for_each(rt2x00dev, queue)
900 rt2x00queue_init(rt2x00dev, queue, qid++);
902 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[0], QID_BEACON);
904 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[1], QID_ATIM);
909 void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
911 kfree(rt2x00dev->rx);
912 rt2x00dev->rx = NULL;
913 rt2x00dev->tx = NULL;
914 rt2x00dev->bcn = NULL;