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 rt2x00_dev *rt2x00dev,
37 struct queue_entry *entry)
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 rt2x00_dev *rt2x00dev, struct sk_buff *skb)
102 struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
105 dma_map_single(rt2x00dev->dev, skb->data, skb->len, DMA_TO_DEVICE);
106 skbdesc->flags |= SKBDESC_DMA_MAPPED_TX;
108 EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb);
110 void rt2x00queue_unmap_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
112 struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
114 if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) {
115 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
117 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_RX;
118 } else if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) {
119 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
121 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX;
124 EXPORT_SYMBOL_GPL(rt2x00queue_unmap_skb);
126 void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
131 rt2x00queue_unmap_skb(rt2x00dev, skb);
132 dev_kfree_skb_any(skb);
135 void rt2x00queue_align_frame(struct sk_buff *skb)
137 unsigned int frame_length = skb->len;
138 unsigned int align = ALIGN_SIZE(skb, 0);
143 skb_push(skb, align);
144 memmove(skb->data, skb->data + align, frame_length);
145 skb_trim(skb, frame_length);
148 void rt2x00queue_align_payload(struct sk_buff *skb, unsigned int header_length)
150 unsigned int frame_length = skb->len;
151 unsigned int align = ALIGN_SIZE(skb, header_length);
156 skb_push(skb, align);
157 memmove(skb->data, skb->data + align, frame_length);
158 skb_trim(skb, frame_length);
161 void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int header_length)
163 unsigned int payload_length = skb->len - header_length;
164 unsigned int header_align = ALIGN_SIZE(skb, 0);
165 unsigned int payload_align = ALIGN_SIZE(skb, header_length);
166 unsigned int l2pad = payload_length ? L2PAD_SIZE(header_length) : 0;
169 * Adjust the header alignment if the payload needs to be moved more
172 if (payload_align > header_align)
175 /* There is nothing to do if no alignment is needed */
179 /* Reserve the amount of space needed in front of the frame */
180 skb_push(skb, header_align);
185 memmove(skb->data, skb->data + header_align, header_length);
187 /* Move the payload, if present and if required */
188 if (payload_length && payload_align)
189 memmove(skb->data + header_length + l2pad,
190 skb->data + header_length + l2pad + payload_align,
193 /* Trim the skb to the correct size */
194 skb_trim(skb, header_length + l2pad + payload_length);
197 void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length)
199 unsigned int l2pad = L2PAD_SIZE(header_length);
204 memmove(skb->data + l2pad, skb->data, header_length);
205 skb_pull(skb, l2pad);
208 static void rt2x00queue_create_tx_descriptor_seq(struct queue_entry *entry,
209 struct txentry_desc *txdesc)
211 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
212 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
213 struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
214 unsigned long irqflags;
216 if (!(tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) ||
217 unlikely(!tx_info->control.vif))
221 * Hardware should insert sequence counter.
222 * FIXME: We insert a software sequence counter first for
223 * hardware that doesn't support hardware sequence counting.
225 * This is wrong because beacons are not getting sequence
226 * numbers assigned properly.
228 * A secondary problem exists for drivers that cannot toggle
229 * sequence counting per-frame, since those will override the
230 * sequence counter given by mac80211.
232 spin_lock_irqsave(&intf->seqlock, irqflags);
234 if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
236 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
237 hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
239 spin_unlock_irqrestore(&intf->seqlock, irqflags);
241 __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
244 static void rt2x00queue_create_tx_descriptor_plcp(struct queue_entry *entry,
245 struct txentry_desc *txdesc,
246 const struct rt2x00_rate *hwrate)
248 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
249 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
250 struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
251 unsigned int data_length;
252 unsigned int duration;
253 unsigned int residual;
255 /* Data length + CRC + Crypto overhead (IV/EIV/ICV/MIC) */
256 data_length = entry->skb->len + 4;
257 data_length += rt2x00crypto_tx_overhead(rt2x00dev, entry->skb);
261 * Length calculation depends on OFDM/CCK rate.
263 txdesc->signal = hwrate->plcp;
264 txdesc->service = 0x04;
266 if (hwrate->flags & DEV_RATE_OFDM) {
267 txdesc->length_high = (data_length >> 6) & 0x3f;
268 txdesc->length_low = data_length & 0x3f;
271 * Convert length to microseconds.
273 residual = GET_DURATION_RES(data_length, hwrate->bitrate);
274 duration = GET_DURATION(data_length, hwrate->bitrate);
280 * Check if we need to set the Length Extension
282 if (hwrate->bitrate == 110 && residual <= 30)
283 txdesc->service |= 0x80;
286 txdesc->length_high = (duration >> 8) & 0xff;
287 txdesc->length_low = duration & 0xff;
290 * When preamble is enabled we should set the
291 * preamble bit for the signal.
293 if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
294 txdesc->signal |= 0x08;
298 static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
299 struct txentry_desc *txdesc)
301 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
302 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
303 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
304 struct ieee80211_rate *rate =
305 ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
306 const struct rt2x00_rate *hwrate;
308 memset(txdesc, 0, sizeof(*txdesc));
311 * Initialize information from queue
313 txdesc->qid = entry->queue->qid;
314 txdesc->cw_min = entry->queue->cw_min;
315 txdesc->cw_max = entry->queue->cw_max;
316 txdesc->aifs = entry->queue->aifs;
319 * Header and frame information.
321 txdesc->length = entry->skb->len;
322 txdesc->header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
325 * Check whether this frame is to be acked.
327 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
328 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
331 * Check if this is a RTS/CTS frame
333 if (ieee80211_is_rts(hdr->frame_control) ||
334 ieee80211_is_cts(hdr->frame_control)) {
335 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
336 if (ieee80211_is_rts(hdr->frame_control))
337 __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
339 __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
340 if (tx_info->control.rts_cts_rate_idx >= 0)
342 ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
346 * Determine retry information.
348 txdesc->retry_limit = tx_info->control.rates[0].count - 1;
349 if (txdesc->retry_limit >= rt2x00dev->long_retry)
350 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
353 * Check if more fragments are pending
355 if (ieee80211_has_morefrags(hdr->frame_control)) {
356 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
357 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
361 * Check if more frames (!= fragments) are pending
363 if (tx_info->flags & IEEE80211_TX_CTL_MORE_FRAMES)
364 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
367 * Beacons and probe responses require the tsf timestamp
368 * to be inserted into the frame, except for a frame that has been injected
369 * through a monitor interface. This latter is needed for testing a
372 if ((ieee80211_is_beacon(hdr->frame_control) ||
373 ieee80211_is_probe_resp(hdr->frame_control)) &&
374 (!(tx_info->flags & IEEE80211_TX_CTL_INJECTED)))
375 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
378 * Determine with what IFS priority this frame should be send.
379 * Set ifs to IFS_SIFS when the this is not the first fragment,
380 * or this fragment came after RTS/CTS.
382 if ((tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) &&
383 !test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) {
384 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
385 txdesc->ifs = IFS_BACKOFF;
387 txdesc->ifs = IFS_SIFS;
390 * Determine rate modulation.
392 hwrate = rt2x00_get_rate(rate->hw_value);
393 txdesc->rate_mode = RATE_MODE_CCK;
394 if (hwrate->flags & DEV_RATE_OFDM)
395 txdesc->rate_mode = RATE_MODE_OFDM;
398 * Apply TX descriptor handling by components
400 rt2x00crypto_create_tx_descriptor(entry, txdesc);
401 rt2x00ht_create_tx_descriptor(entry, txdesc, hwrate);
402 rt2x00queue_create_tx_descriptor_seq(entry, txdesc);
403 rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, hwrate);
406 static int rt2x00queue_write_tx_data(struct queue_entry *entry,
407 struct txentry_desc *txdesc)
409 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
412 * This should not happen, we already checked the entry
413 * was ours. When the hardware disagrees there has been
414 * a queue corruption!
416 if (unlikely(rt2x00dev->ops->lib->get_entry_state &&
417 rt2x00dev->ops->lib->get_entry_state(entry))) {
419 "Corrupt queue %d, accessing entry which is not ours.\n"
420 "Please file bug report to %s.\n",
421 entry->queue->qid, DRV_PROJECT);
426 * Add the requested extra tx headroom in front of the skb.
428 skb_push(entry->skb, rt2x00dev->ops->extra_tx_headroom);
429 memset(entry->skb->data, 0, rt2x00dev->ops->extra_tx_headroom);
432 * Call the driver's write_tx_data function, if it exists.
434 if (rt2x00dev->ops->lib->write_tx_data)
435 rt2x00dev->ops->lib->write_tx_data(entry, txdesc);
438 * Map the skb to DMA.
440 if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
441 rt2x00queue_map_txskb(rt2x00dev, entry->skb);
446 static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
447 struct txentry_desc *txdesc)
449 struct data_queue *queue = entry->queue;
451 queue->rt2x00dev->ops->lib->write_tx_desc(entry, txdesc);
454 * All processing on the frame has been completed, this means
455 * it is now ready to be dumped to userspace through debugfs.
457 rt2x00debug_dump_frame(queue->rt2x00dev, DUMP_FRAME_TX, entry->skb);
460 static void rt2x00queue_kick_tx_queue(struct queue_entry *entry,
461 struct txentry_desc *txdesc)
463 struct data_queue *queue = entry->queue;
464 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
467 * Check if we need to kick the queue, there are however a few rules
468 * 1) Don't kick unless this is the last in frame in a burst.
469 * When the burst flag is set, this frame is always followed
470 * by another frame which in some way are related to eachother.
471 * This is true for fragments, RTS or CTS-to-self frames.
472 * 2) Rule 1 can be broken when the available entries
473 * in the queue are less then a certain threshold.
475 if (rt2x00queue_threshold(queue) ||
476 !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
477 rt2x00dev->ops->lib->kick_tx_queue(queue);
480 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
483 struct ieee80211_tx_info *tx_info;
484 struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
485 struct txentry_desc txdesc;
486 struct skb_frame_desc *skbdesc;
487 u8 rate_idx, rate_flags;
489 if (unlikely(rt2x00queue_full(queue)))
492 if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
493 ERROR(queue->rt2x00dev,
494 "Arrived at non-free entry in the non-full queue %d.\n"
495 "Please file bug report to %s.\n",
496 queue->qid, DRV_PROJECT);
501 * Copy all TX descriptor information into txdesc,
502 * after that we are free to use the skb->cb array
503 * for our information.
506 rt2x00queue_create_tx_descriptor(entry, &txdesc);
509 * All information is retrieved from the skb->cb array,
510 * now we should claim ownership of the driver part of that
511 * array, preserving the bitrate index and flags.
513 tx_info = IEEE80211_SKB_CB(skb);
514 rate_idx = tx_info->control.rates[0].idx;
515 rate_flags = tx_info->control.rates[0].flags;
516 skbdesc = get_skb_frame_desc(skb);
517 memset(skbdesc, 0, sizeof(*skbdesc));
518 skbdesc->entry = entry;
519 skbdesc->tx_rate_idx = rate_idx;
520 skbdesc->tx_rate_flags = rate_flags;
523 skbdesc->flags |= SKBDESC_NOT_MAC80211;
526 * When hardware encryption is supported, and this frame
527 * is to be encrypted, we should strip the IV/EIV data from
528 * the frame so we can provide it to the driver separately.
530 if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
531 !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) {
532 if (test_bit(DRIVER_REQUIRE_COPY_IV, &queue->rt2x00dev->flags))
533 rt2x00crypto_tx_copy_iv(skb, &txdesc);
535 rt2x00crypto_tx_remove_iv(skb, &txdesc);
539 * When DMA allocation is required we should guarentee to the
540 * driver that the DMA is aligned to a 4-byte boundary.
541 * However some drivers require L2 padding to pad the payload
542 * rather then the header. This could be a requirement for
543 * PCI and USB devices, while header alignment only is valid
546 if (test_bit(DRIVER_REQUIRE_L2PAD, &queue->rt2x00dev->flags))
547 rt2x00queue_insert_l2pad(entry->skb, txdesc.header_length);
548 else if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
549 rt2x00queue_align_frame(entry->skb);
552 * It could be possible that the queue was corrupted and this
553 * call failed. Since we always return NETDEV_TX_OK to mac80211,
554 * this frame will simply be dropped.
556 if (unlikely(rt2x00queue_write_tx_data(entry, &txdesc))) {
557 clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
562 set_bit(ENTRY_DATA_PENDING, &entry->flags);
564 rt2x00queue_index_inc(queue, Q_INDEX);
565 rt2x00queue_write_tx_descriptor(entry, &txdesc);
566 rt2x00queue_kick_tx_queue(entry, &txdesc);
571 int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
572 struct ieee80211_vif *vif,
573 const bool enable_beacon)
575 struct rt2x00_intf *intf = vif_to_intf(vif);
576 struct skb_frame_desc *skbdesc;
577 struct txentry_desc txdesc;
579 if (unlikely(!intf->beacon))
582 mutex_lock(&intf->beacon_skb_mutex);
585 * Clean up the beacon skb.
587 rt2x00queue_free_skb(rt2x00dev, intf->beacon->skb);
588 intf->beacon->skb = NULL;
590 if (!enable_beacon) {
591 rt2x00dev->ops->lib->kill_tx_queue(intf->beacon->queue);
592 mutex_unlock(&intf->beacon_skb_mutex);
596 intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
597 if (!intf->beacon->skb) {
598 mutex_unlock(&intf->beacon_skb_mutex);
603 * Copy all TX descriptor information into txdesc,
604 * after that we are free to use the skb->cb array
605 * for our information.
607 rt2x00queue_create_tx_descriptor(intf->beacon, &txdesc);
610 * Fill in skb descriptor
612 skbdesc = get_skb_frame_desc(intf->beacon->skb);
613 memset(skbdesc, 0, sizeof(*skbdesc));
614 skbdesc->entry = intf->beacon;
617 * Send beacon to hardware and enable beacon genaration..
619 rt2x00dev->ops->lib->write_beacon(intf->beacon, &txdesc);
621 mutex_unlock(&intf->beacon_skb_mutex);
626 void rt2x00queue_for_each_entry(struct data_queue *queue,
627 enum queue_index start,
628 enum queue_index end,
629 void (*fn)(struct queue_entry *entry))
631 unsigned long irqflags;
632 unsigned int index_start;
633 unsigned int index_end;
636 if (unlikely(start >= Q_INDEX_MAX || end >= Q_INDEX_MAX)) {
637 ERROR(queue->rt2x00dev,
638 "Entry requested from invalid index range (%d - %d)\n",
644 * Only protect the range we are going to loop over,
645 * if during our loop a extra entry is set to pending
646 * it should not be kicked during this run, since it
647 * is part of another TX operation.
649 spin_lock_irqsave(&queue->lock, irqflags);
650 index_start = queue->index[start];
651 index_end = queue->index[end];
652 spin_unlock_irqrestore(&queue->lock, irqflags);
655 * Start from the TX done pointer, this guarentees that we will
656 * send out all frames in the correct order.
658 if (index_start < index_end) {
659 for (i = index_start; i < index_end; i++)
660 fn(&queue->entries[i]);
662 for (i = index_start; i < queue->limit; i++)
663 fn(&queue->entries[i]);
665 for (i = 0; i < index_end; i++)
666 fn(&queue->entries[i]);
669 EXPORT_SYMBOL_GPL(rt2x00queue_for_each_entry);
671 struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
672 const enum data_queue_qid queue)
674 int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
677 return rt2x00dev->rx;
679 if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx)
680 return &rt2x00dev->tx[queue];
685 if (queue == QID_BEACON)
686 return &rt2x00dev->bcn[0];
687 else if (queue == QID_ATIM && atim)
688 return &rt2x00dev->bcn[1];
692 EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
694 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
695 enum queue_index index)
697 struct queue_entry *entry;
698 unsigned long irqflags;
700 if (unlikely(index >= Q_INDEX_MAX)) {
701 ERROR(queue->rt2x00dev,
702 "Entry requested from invalid index type (%d)\n", index);
706 spin_lock_irqsave(&queue->lock, irqflags);
708 entry = &queue->entries[queue->index[index]];
710 spin_unlock_irqrestore(&queue->lock, irqflags);
714 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
716 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
718 unsigned long irqflags;
720 if (unlikely(index >= Q_INDEX_MAX)) {
721 ERROR(queue->rt2x00dev,
722 "Index change on invalid index type (%d)\n", index);
726 spin_lock_irqsave(&queue->lock, irqflags);
728 queue->index[index]++;
729 if (queue->index[index] >= queue->limit)
730 queue->index[index] = 0;
732 queue->last_action[index] = jiffies;
734 if (index == Q_INDEX) {
736 } else if (index == Q_INDEX_DONE) {
741 spin_unlock_irqrestore(&queue->lock, irqflags);
744 static void rt2x00queue_reset(struct data_queue *queue)
746 unsigned long irqflags;
749 spin_lock_irqsave(&queue->lock, irqflags);
754 for (i = 0; i < Q_INDEX_MAX; i++) {
756 queue->last_action[i] = jiffies;
759 spin_unlock_irqrestore(&queue->lock, irqflags);
762 void rt2x00queue_stop_queues(struct rt2x00_dev *rt2x00dev)
764 struct data_queue *queue;
766 txall_queue_for_each(rt2x00dev, queue)
767 rt2x00dev->ops->lib->kill_tx_queue(queue);
770 void rt2x00queue_init_queues(struct rt2x00_dev *rt2x00dev)
772 struct data_queue *queue;
775 queue_for_each(rt2x00dev, queue) {
776 rt2x00queue_reset(queue);
778 for (i = 0; i < queue->limit; i++) {
779 rt2x00dev->ops->lib->clear_entry(&queue->entries[i]);
780 if (queue->qid == QID_RX)
781 rt2x00queue_index_inc(queue, Q_INDEX);
786 static int rt2x00queue_alloc_entries(struct data_queue *queue,
787 const struct data_queue_desc *qdesc)
789 struct queue_entry *entries;
790 unsigned int entry_size;
793 rt2x00queue_reset(queue);
795 queue->limit = qdesc->entry_num;
796 queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
797 queue->data_size = qdesc->data_size;
798 queue->desc_size = qdesc->desc_size;
801 * Allocate all queue entries.
803 entry_size = sizeof(*entries) + qdesc->priv_size;
804 entries = kzalloc(queue->limit * entry_size, GFP_KERNEL);
808 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
809 ( ((char *)(__base)) + ((__limit) * (__esize)) + \
810 ((__index) * (__psize)) )
812 for (i = 0; i < queue->limit; i++) {
813 entries[i].flags = 0;
814 entries[i].queue = queue;
815 entries[i].skb = NULL;
816 entries[i].entry_idx = i;
817 entries[i].priv_data =
818 QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
819 sizeof(*entries), qdesc->priv_size);
822 #undef QUEUE_ENTRY_PRIV_OFFSET
824 queue->entries = entries;
829 static void rt2x00queue_free_skbs(struct rt2x00_dev *rt2x00dev,
830 struct data_queue *queue)
837 for (i = 0; i < queue->limit; i++) {
838 if (queue->entries[i].skb)
839 rt2x00queue_free_skb(rt2x00dev, queue->entries[i].skb);
843 static int rt2x00queue_alloc_rxskbs(struct rt2x00_dev *rt2x00dev,
844 struct data_queue *queue)
849 for (i = 0; i < queue->limit; i++) {
850 skb = rt2x00queue_alloc_rxskb(rt2x00dev, &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, 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, 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 = kzalloc(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;