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/kernel.h>
28 #include <linux/module.h>
29 #include <linux/dma-mapping.h>
32 #include "rt2x00lib.h"
34 struct sk_buff *rt2x00queue_alloc_rxskb(struct rt2x00_dev *rt2x00dev,
35 struct queue_entry *entry)
38 struct skb_frame_desc *skbdesc;
39 unsigned int frame_size;
40 unsigned int head_size = 0;
41 unsigned int tail_size = 0;
44 * The frame size includes descriptor size, because the
45 * hardware directly receive the frame into the skbuffer.
47 frame_size = entry->queue->data_size + entry->queue->desc_size;
50 * The payload should be aligned to a 4-byte boundary,
51 * this means we need at least 3 bytes for moving the frame
52 * into the correct offset.
57 * For IV/EIV/ICV assembly we must make sure there is
58 * at least 8 bytes bytes available in headroom for IV/EIV
59 * and 8 bytes for ICV data as tailroon.
61 if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags)) {
69 skb = dev_alloc_skb(frame_size + head_size + tail_size);
74 * Make sure we not have a frame with the requested bytes
75 * available in the head and tail.
77 skb_reserve(skb, head_size);
78 skb_put(skb, frame_size);
83 skbdesc = get_skb_frame_desc(skb);
84 memset(skbdesc, 0, sizeof(*skbdesc));
85 skbdesc->entry = entry;
87 if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags)) {
88 skbdesc->skb_dma = dma_map_single(rt2x00dev->dev,
92 skbdesc->flags |= SKBDESC_DMA_MAPPED_RX;
98 void rt2x00queue_map_txskb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
100 struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
103 * If device has requested headroom, we should make sure that
104 * is also mapped to the DMA so it can be used for transfering
105 * additional descriptor information to the hardware.
107 skb_push(skb, rt2x00dev->ops->extra_tx_headroom);
110 dma_map_single(rt2x00dev->dev, skb->data, skb->len, DMA_TO_DEVICE);
113 * Restore data pointer to original location again.
115 skb_pull(skb, rt2x00dev->ops->extra_tx_headroom);
117 skbdesc->flags |= SKBDESC_DMA_MAPPED_TX;
119 EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb);
121 void rt2x00queue_unmap_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
123 struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
125 if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) {
126 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
128 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_RX;
131 if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) {
133 * Add headroom to the skb length, it has been removed
134 * by the driver, but it was actually mapped to DMA.
136 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma,
137 skb->len + rt2x00dev->ops->extra_tx_headroom,
139 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX;
143 void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
148 rt2x00queue_unmap_skb(rt2x00dev, skb);
149 dev_kfree_skb_any(skb);
152 void rt2x00queue_align_frame(struct sk_buff *skb)
154 unsigned int frame_length = skb->len;
155 unsigned int align = ALIGN_SIZE(skb, 0);
160 skb_push(skb, align);
161 memmove(skb->data, skb->data + align, frame_length);
162 skb_trim(skb, frame_length);
165 void rt2x00queue_align_payload(struct sk_buff *skb, unsigned int header_length)
167 unsigned int frame_length = skb->len;
168 unsigned int align = ALIGN_SIZE(skb, header_length);
173 skb_push(skb, align);
174 memmove(skb->data, skb->data + align, frame_length);
175 skb_trim(skb, frame_length);
178 void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int header_length)
180 unsigned int payload_length = skb->len - header_length;
181 unsigned int header_align = ALIGN_SIZE(skb, 0);
182 unsigned int payload_align = ALIGN_SIZE(skb, header_length);
183 unsigned int l2pad = payload_length ? L2PAD_SIZE(header_length) : 0;
186 * Adjust the header alignment if the payload needs to be moved more
189 if (payload_align > header_align)
192 /* There is nothing to do if no alignment is needed */
196 /* Reserve the amount of space needed in front of the frame */
197 skb_push(skb, header_align);
202 memmove(skb->data, skb->data + header_align, header_length);
204 /* Move the payload, if present and if required */
205 if (payload_length && payload_align)
206 memmove(skb->data + header_length + l2pad,
207 skb->data + header_length + l2pad + payload_align,
210 /* Trim the skb to the correct size */
211 skb_trim(skb, header_length + l2pad + payload_length);
214 void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length)
216 unsigned int l2pad = L2PAD_SIZE(header_length);
221 memmove(skb->data + l2pad, skb->data, header_length);
222 skb_pull(skb, l2pad);
225 static void rt2x00queue_create_tx_descriptor_seq(struct queue_entry *entry,
226 struct txentry_desc *txdesc)
228 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
229 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
230 struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
231 unsigned long irqflags;
233 if (!(tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) ||
234 unlikely(!tx_info->control.vif))
238 * Hardware should insert sequence counter.
239 * FIXME: We insert a software sequence counter first for
240 * hardware that doesn't support hardware sequence counting.
242 * This is wrong because beacons are not getting sequence
243 * numbers assigned properly.
245 * A secondary problem exists for drivers that cannot toggle
246 * sequence counting per-frame, since those will override the
247 * sequence counter given by mac80211.
249 spin_lock_irqsave(&intf->seqlock, irqflags);
251 if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
253 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
254 hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
256 spin_unlock_irqrestore(&intf->seqlock, irqflags);
258 __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
261 static void rt2x00queue_create_tx_descriptor_plcp(struct queue_entry *entry,
262 struct txentry_desc *txdesc,
263 const struct rt2x00_rate *hwrate)
265 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
266 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
267 struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
268 unsigned int data_length;
269 unsigned int duration;
270 unsigned int residual;
272 /* Data length + CRC + Crypto overhead (IV/EIV/ICV/MIC) */
273 data_length = entry->skb->len + 4;
274 data_length += rt2x00crypto_tx_overhead(rt2x00dev, entry->skb);
278 * Length calculation depends on OFDM/CCK rate.
280 txdesc->signal = hwrate->plcp;
281 txdesc->service = 0x04;
283 if (hwrate->flags & DEV_RATE_OFDM) {
284 txdesc->length_high = (data_length >> 6) & 0x3f;
285 txdesc->length_low = data_length & 0x3f;
288 * Convert length to microseconds.
290 residual = GET_DURATION_RES(data_length, hwrate->bitrate);
291 duration = GET_DURATION(data_length, hwrate->bitrate);
297 * Check if we need to set the Length Extension
299 if (hwrate->bitrate == 110 && residual <= 30)
300 txdesc->service |= 0x80;
303 txdesc->length_high = (duration >> 8) & 0xff;
304 txdesc->length_low = duration & 0xff;
307 * When preamble is enabled we should set the
308 * preamble bit for the signal.
310 if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
311 txdesc->signal |= 0x08;
315 static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
316 struct txentry_desc *txdesc)
318 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
319 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
320 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
321 struct ieee80211_rate *rate =
322 ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
323 const struct rt2x00_rate *hwrate;
325 memset(txdesc, 0, sizeof(*txdesc));
328 * Initialize information from queue
330 txdesc->queue = entry->queue->qid;
331 txdesc->cw_min = entry->queue->cw_min;
332 txdesc->cw_max = entry->queue->cw_max;
333 txdesc->aifs = entry->queue->aifs;
336 * Header and frame information.
338 txdesc->length = entry->skb->len;
339 txdesc->header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
342 * Check whether this frame is to be acked.
344 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
345 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
348 * Check if this is a RTS/CTS frame
350 if (ieee80211_is_rts(hdr->frame_control) ||
351 ieee80211_is_cts(hdr->frame_control)) {
352 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
353 if (ieee80211_is_rts(hdr->frame_control))
354 __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
356 __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
357 if (tx_info->control.rts_cts_rate_idx >= 0)
359 ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
363 * Determine retry information.
365 txdesc->retry_limit = tx_info->control.rates[0].count - 1;
366 if (txdesc->retry_limit >= rt2x00dev->long_retry)
367 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
370 * Check if more fragments are pending
372 if (ieee80211_has_morefrags(hdr->frame_control) ||
373 (tx_info->flags & IEEE80211_TX_CTL_MORE_FRAMES)) {
374 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
375 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
379 * Beacons and probe responses require the tsf timestamp
380 * to be inserted into the frame, except for a frame that has been injected
381 * through a monitor interface. This latter is needed for testing a
384 if ((ieee80211_is_beacon(hdr->frame_control) ||
385 ieee80211_is_probe_resp(hdr->frame_control)) &&
386 (!(tx_info->flags & IEEE80211_TX_CTL_INJECTED)))
387 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
390 * Determine with what IFS priority this frame should be send.
391 * Set ifs to IFS_SIFS when the this is not the first fragment,
392 * or this fragment came after RTS/CTS.
394 if ((tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) &&
395 !test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) {
396 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
397 txdesc->ifs = IFS_BACKOFF;
399 txdesc->ifs = IFS_SIFS;
402 * Determine rate modulation.
404 hwrate = rt2x00_get_rate(rate->hw_value);
405 txdesc->rate_mode = RATE_MODE_CCK;
406 if (hwrate->flags & DEV_RATE_OFDM)
407 txdesc->rate_mode = RATE_MODE_OFDM;
410 * Apply TX descriptor handling by components
412 rt2x00crypto_create_tx_descriptor(entry, txdesc);
413 rt2x00ht_create_tx_descriptor(entry, txdesc, hwrate);
414 rt2x00queue_create_tx_descriptor_seq(entry, txdesc);
415 rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, hwrate);
418 static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
419 struct txentry_desc *txdesc)
421 struct data_queue *queue = entry->queue;
422 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
424 rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, entry->skb, txdesc);
427 * All processing on the frame has been completed, this means
428 * it is now ready to be dumped to userspace through debugfs.
430 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TX, entry->skb);
433 * Check if we need to kick the queue, there are however a few rules
434 * 1) Don't kick beacon queue
435 * 2) Don't kick unless this is the last in frame in a burst.
436 * When the burst flag is set, this frame is always followed
437 * by another frame which in some way are related to eachother.
438 * This is true for fragments, RTS or CTS-to-self frames.
439 * 3) Rule 2 can be broken when the available entries
440 * in the queue are less then a certain threshold.
442 if (entry->queue->qid == QID_BEACON)
445 if (rt2x00queue_threshold(queue) ||
446 !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
447 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, queue->qid);
450 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
453 struct ieee80211_tx_info *tx_info;
454 struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
455 struct txentry_desc txdesc;
456 struct skb_frame_desc *skbdesc;
457 u8 rate_idx, rate_flags;
459 if (unlikely(rt2x00queue_full(queue)))
462 if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
463 ERROR(queue->rt2x00dev,
464 "Arrived at non-free entry in the non-full queue %d.\n"
465 "Please file bug report to %s.\n",
466 queue->qid, DRV_PROJECT);
471 * Copy all TX descriptor information into txdesc,
472 * after that we are free to use the skb->cb array
473 * for our information.
476 rt2x00queue_create_tx_descriptor(entry, &txdesc);
479 * All information is retrieved from the skb->cb array,
480 * now we should claim ownership of the driver part of that
481 * array, preserving the bitrate index and flags.
483 tx_info = IEEE80211_SKB_CB(skb);
484 rate_idx = tx_info->control.rates[0].idx;
485 rate_flags = tx_info->control.rates[0].flags;
486 skbdesc = get_skb_frame_desc(skb);
487 memset(skbdesc, 0, sizeof(*skbdesc));
488 skbdesc->entry = entry;
489 skbdesc->tx_rate_idx = rate_idx;
490 skbdesc->tx_rate_flags = rate_flags;
493 skbdesc->flags |= SKBDESC_NOT_MAC80211;
496 * When hardware encryption is supported, and this frame
497 * is to be encrypted, we should strip the IV/EIV data from
498 * the frame so we can provide it to the driver seperately.
500 if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
501 !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) {
502 if (test_bit(DRIVER_REQUIRE_COPY_IV, &queue->rt2x00dev->flags))
503 rt2x00crypto_tx_copy_iv(skb, &txdesc);
505 rt2x00crypto_tx_remove_iv(skb, &txdesc);
509 * When DMA allocation is required we should guarentee to the
510 * driver that the DMA is aligned to a 4-byte boundary.
511 * However some drivers require L2 padding to pad the payload
512 * rather then the header. This could be a requirement for
513 * PCI and USB devices, while header alignment only is valid
516 if (test_bit(DRIVER_REQUIRE_L2PAD, &queue->rt2x00dev->flags))
517 rt2x00queue_insert_l2pad(entry->skb, txdesc.header_length);
518 else if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
519 rt2x00queue_align_frame(entry->skb);
522 * It could be possible that the queue was corrupted and this
523 * call failed. Since we always return NETDEV_TX_OK to mac80211,
524 * this frame will simply be dropped.
526 if (unlikely(queue->rt2x00dev->ops->lib->write_tx_data(entry,
528 clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
533 if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
534 rt2x00queue_map_txskb(queue->rt2x00dev, skb);
536 set_bit(ENTRY_DATA_PENDING, &entry->flags);
538 rt2x00queue_index_inc(queue, Q_INDEX);
539 rt2x00queue_write_tx_descriptor(entry, &txdesc);
544 int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
545 struct ieee80211_vif *vif,
546 const bool enable_beacon)
548 struct rt2x00_intf *intf = vif_to_intf(vif);
549 struct skb_frame_desc *skbdesc;
550 struct txentry_desc txdesc;
553 if (unlikely(!intf->beacon))
556 mutex_lock(&intf->beacon_skb_mutex);
559 * Clean up the beacon skb.
561 rt2x00queue_free_skb(rt2x00dev, intf->beacon->skb);
562 intf->beacon->skb = NULL;
564 if (!enable_beacon) {
565 rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev, QID_BEACON);
566 mutex_unlock(&intf->beacon_skb_mutex);
570 intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
571 if (!intf->beacon->skb) {
572 mutex_unlock(&intf->beacon_skb_mutex);
577 * Copy all TX descriptor information into txdesc,
578 * after that we are free to use the skb->cb array
579 * for our information.
581 rt2x00queue_create_tx_descriptor(intf->beacon, &txdesc);
584 * For the descriptor we use a local array from where the
585 * driver can move it to the correct location required for
588 memset(desc, 0, sizeof(desc));
591 * Fill in skb descriptor
593 skbdesc = get_skb_frame_desc(intf->beacon->skb);
594 memset(skbdesc, 0, sizeof(*skbdesc));
595 skbdesc->desc = desc;
596 skbdesc->desc_len = intf->beacon->queue->desc_size;
597 skbdesc->entry = intf->beacon;
600 * Write TX descriptor into reserved room in front of the beacon.
602 rt2x00queue_write_tx_descriptor(intf->beacon, &txdesc);
605 * Send beacon to hardware.
606 * Also enable beacon generation, which might have been disabled
607 * by the driver during the config_beacon() callback function.
609 rt2x00dev->ops->lib->write_beacon(intf->beacon);
610 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, QID_BEACON);
612 mutex_unlock(&intf->beacon_skb_mutex);
617 struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
618 const enum data_queue_qid queue)
620 int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
623 return rt2x00dev->rx;
625 if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx)
626 return &rt2x00dev->tx[queue];
631 if (queue == QID_BEACON)
632 return &rt2x00dev->bcn[0];
633 else if (queue == QID_ATIM && atim)
634 return &rt2x00dev->bcn[1];
638 EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
640 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
641 enum queue_index index)
643 struct queue_entry *entry;
644 unsigned long irqflags;
646 if (unlikely(index >= Q_INDEX_MAX)) {
647 ERROR(queue->rt2x00dev,
648 "Entry requested from invalid index type (%d)\n", index);
652 spin_lock_irqsave(&queue->lock, irqflags);
654 entry = &queue->entries[queue->index[index]];
656 spin_unlock_irqrestore(&queue->lock, irqflags);
660 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
662 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
664 unsigned long irqflags;
666 if (unlikely(index >= Q_INDEX_MAX)) {
667 ERROR(queue->rt2x00dev,
668 "Index change on invalid index type (%d)\n", index);
672 spin_lock_irqsave(&queue->lock, irqflags);
674 queue->index[index]++;
675 if (queue->index[index] >= queue->limit)
676 queue->index[index] = 0;
678 if (index == Q_INDEX) {
680 } else if (index == Q_INDEX_DONE) {
685 spin_unlock_irqrestore(&queue->lock, irqflags);
688 static void rt2x00queue_reset(struct data_queue *queue)
690 unsigned long irqflags;
692 spin_lock_irqsave(&queue->lock, irqflags);
696 memset(queue->index, 0, sizeof(queue->index));
698 spin_unlock_irqrestore(&queue->lock, irqflags);
701 void rt2x00queue_stop_queues(struct rt2x00_dev *rt2x00dev)
703 struct data_queue *queue;
705 txall_queue_for_each(rt2x00dev, queue)
706 rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev, queue->qid);
709 void rt2x00queue_init_queues(struct rt2x00_dev *rt2x00dev)
711 struct data_queue *queue;
714 queue_for_each(rt2x00dev, queue) {
715 rt2x00queue_reset(queue);
717 for (i = 0; i < queue->limit; i++) {
718 queue->entries[i].flags = 0;
720 rt2x00dev->ops->lib->clear_entry(&queue->entries[i]);
725 static int rt2x00queue_alloc_entries(struct data_queue *queue,
726 const struct data_queue_desc *qdesc)
728 struct queue_entry *entries;
729 unsigned int entry_size;
732 rt2x00queue_reset(queue);
734 queue->limit = qdesc->entry_num;
735 queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
736 queue->data_size = qdesc->data_size;
737 queue->desc_size = qdesc->desc_size;
740 * Allocate all queue entries.
742 entry_size = sizeof(*entries) + qdesc->priv_size;
743 entries = kzalloc(queue->limit * entry_size, GFP_KERNEL);
747 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
748 ( ((char *)(__base)) + ((__limit) * (__esize)) + \
749 ((__index) * (__psize)) )
751 for (i = 0; i < queue->limit; i++) {
752 entries[i].flags = 0;
753 entries[i].queue = queue;
754 entries[i].skb = NULL;
755 entries[i].entry_idx = i;
756 entries[i].priv_data =
757 QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
758 sizeof(*entries), qdesc->priv_size);
761 #undef QUEUE_ENTRY_PRIV_OFFSET
763 queue->entries = entries;
768 static void rt2x00queue_free_skbs(struct rt2x00_dev *rt2x00dev,
769 struct data_queue *queue)
776 for (i = 0; i < queue->limit; i++) {
777 if (queue->entries[i].skb)
778 rt2x00queue_free_skb(rt2x00dev, queue->entries[i].skb);
782 static int rt2x00queue_alloc_rxskbs(struct rt2x00_dev *rt2x00dev,
783 struct data_queue *queue)
788 for (i = 0; i < queue->limit; i++) {
789 skb = rt2x00queue_alloc_rxskb(rt2x00dev, &queue->entries[i]);
792 queue->entries[i].skb = skb;
798 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
800 struct data_queue *queue;
803 status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
807 tx_queue_for_each(rt2x00dev, queue) {
808 status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
813 status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
817 if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) {
818 status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1],
819 rt2x00dev->ops->atim);
824 status = rt2x00queue_alloc_rxskbs(rt2x00dev, rt2x00dev->rx);
831 ERROR(rt2x00dev, "Queue entries allocation failed.\n");
833 rt2x00queue_uninitialize(rt2x00dev);
838 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
840 struct data_queue *queue;
842 rt2x00queue_free_skbs(rt2x00dev, rt2x00dev->rx);
844 queue_for_each(rt2x00dev, queue) {
845 kfree(queue->entries);
846 queue->entries = NULL;
850 static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
851 struct data_queue *queue, enum data_queue_qid qid)
853 spin_lock_init(&queue->lock);
855 queue->rt2x00dev = rt2x00dev;
863 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
865 struct data_queue *queue;
866 enum data_queue_qid qid;
867 unsigned int req_atim =
868 !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
871 * We need the following queues:
875 * Atim: 1 (if required)
877 rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim;
879 queue = kzalloc(rt2x00dev->data_queues * sizeof(*queue), GFP_KERNEL);
881 ERROR(rt2x00dev, "Queue allocation failed.\n");
886 * Initialize pointers
888 rt2x00dev->rx = queue;
889 rt2x00dev->tx = &queue[1];
890 rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues];
893 * Initialize queue parameters.
895 * TX: qid = QID_AC_BE + index
896 * TX: cw_min: 2^5 = 32.
897 * TX: cw_max: 2^10 = 1024.
898 * BCN: qid = QID_BEACON
899 * ATIM: qid = QID_ATIM
901 rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
904 tx_queue_for_each(rt2x00dev, queue)
905 rt2x00queue_init(rt2x00dev, queue, qid++);
907 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[0], QID_BEACON);
909 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[1], QID_ATIM);
914 void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
916 kfree(rt2x00dev->rx);
917 rt2x00dev->rx = NULL;
918 rt2x00dev->tx = NULL;
919 rt2x00dev->bcn = NULL;