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 dma_map_single(rt2x00dev->dev, skb->data, skb->len, DMA_TO_DEVICE);
105 skbdesc->flags |= SKBDESC_DMA_MAPPED_TX;
107 EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb);
109 void rt2x00queue_unmap_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
111 struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
113 if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) {
114 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
116 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_RX;
119 if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) {
120 dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
122 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX;
125 EXPORT_SYMBOL_GPL(rt2x00queue_unmap_skb);
127 void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
132 rt2x00queue_unmap_skb(rt2x00dev, skb);
133 dev_kfree_skb_any(skb);
136 void rt2x00queue_align_frame(struct sk_buff *skb)
138 unsigned int frame_length = skb->len;
139 unsigned int align = ALIGN_SIZE(skb, 0);
144 skb_push(skb, align);
145 memmove(skb->data, skb->data + align, frame_length);
146 skb_trim(skb, frame_length);
149 void rt2x00queue_align_payload(struct sk_buff *skb, unsigned int header_length)
151 unsigned int frame_length = skb->len;
152 unsigned int align = ALIGN_SIZE(skb, header_length);
157 skb_push(skb, align);
158 memmove(skb->data, skb->data + align, frame_length);
159 skb_trim(skb, frame_length);
162 void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int header_length)
164 unsigned int payload_length = skb->len - header_length;
165 unsigned int header_align = ALIGN_SIZE(skb, 0);
166 unsigned int payload_align = ALIGN_SIZE(skb, header_length);
167 unsigned int l2pad = payload_length ? L2PAD_SIZE(header_length) : 0;
170 * Adjust the header alignment if the payload needs to be moved more
173 if (payload_align > header_align)
176 /* There is nothing to do if no alignment is needed */
180 /* Reserve the amount of space needed in front of the frame */
181 skb_push(skb, header_align);
186 memmove(skb->data, skb->data + header_align, header_length);
188 /* Move the payload, if present and if required */
189 if (payload_length && payload_align)
190 memmove(skb->data + header_length + l2pad,
191 skb->data + header_length + l2pad + payload_align,
194 /* Trim the skb to the correct size */
195 skb_trim(skb, header_length + l2pad + payload_length);
198 void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length)
200 unsigned int l2pad = L2PAD_SIZE(header_length);
205 memmove(skb->data + l2pad, skb->data, header_length);
206 skb_pull(skb, l2pad);
209 static void rt2x00queue_create_tx_descriptor_seq(struct queue_entry *entry,
210 struct txentry_desc *txdesc)
212 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
213 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
214 struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
215 unsigned long irqflags;
217 if (!(tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) ||
218 unlikely(!tx_info->control.vif))
222 * Hardware should insert sequence counter.
223 * FIXME: We insert a software sequence counter first for
224 * hardware that doesn't support hardware sequence counting.
226 * This is wrong because beacons are not getting sequence
227 * numbers assigned properly.
229 * A secondary problem exists for drivers that cannot toggle
230 * sequence counting per-frame, since those will override the
231 * sequence counter given by mac80211.
233 spin_lock_irqsave(&intf->seqlock, irqflags);
235 if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
237 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
238 hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
240 spin_unlock_irqrestore(&intf->seqlock, irqflags);
242 __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
245 static void rt2x00queue_create_tx_descriptor_plcp(struct queue_entry *entry,
246 struct txentry_desc *txdesc,
247 const struct rt2x00_rate *hwrate)
249 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
250 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
251 struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
252 unsigned int data_length;
253 unsigned int duration;
254 unsigned int residual;
256 /* Data length + CRC + Crypto overhead (IV/EIV/ICV/MIC) */
257 data_length = entry->skb->len + 4;
258 data_length += rt2x00crypto_tx_overhead(rt2x00dev, entry->skb);
262 * Length calculation depends on OFDM/CCK rate.
264 txdesc->signal = hwrate->plcp;
265 txdesc->service = 0x04;
267 if (hwrate->flags & DEV_RATE_OFDM) {
268 txdesc->length_high = (data_length >> 6) & 0x3f;
269 txdesc->length_low = data_length & 0x3f;
272 * Convert length to microseconds.
274 residual = GET_DURATION_RES(data_length, hwrate->bitrate);
275 duration = GET_DURATION(data_length, hwrate->bitrate);
281 * Check if we need to set the Length Extension
283 if (hwrate->bitrate == 110 && residual <= 30)
284 txdesc->service |= 0x80;
287 txdesc->length_high = (duration >> 8) & 0xff;
288 txdesc->length_low = duration & 0xff;
291 * When preamble is enabled we should set the
292 * preamble bit for the signal.
294 if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
295 txdesc->signal |= 0x08;
299 static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
300 struct txentry_desc *txdesc)
302 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
303 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
304 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
305 struct ieee80211_rate *rate =
306 ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
307 const struct rt2x00_rate *hwrate;
309 memset(txdesc, 0, sizeof(*txdesc));
312 * Initialize information from queue
314 txdesc->queue = entry->queue->qid;
315 txdesc->cw_min = entry->queue->cw_min;
316 txdesc->cw_max = entry->queue->cw_max;
317 txdesc->aifs = entry->queue->aifs;
320 * Header and frame information.
322 txdesc->length = entry->skb->len;
323 txdesc->header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
326 * Check whether this frame is to be acked.
328 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
329 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
332 * Check if this is a RTS/CTS frame
334 if (ieee80211_is_rts(hdr->frame_control) ||
335 ieee80211_is_cts(hdr->frame_control)) {
336 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
337 if (ieee80211_is_rts(hdr->frame_control))
338 __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
340 __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
341 if (tx_info->control.rts_cts_rate_idx >= 0)
343 ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
347 * Determine retry information.
349 txdesc->retry_limit = tx_info->control.rates[0].count - 1;
350 if (txdesc->retry_limit >= rt2x00dev->long_retry)
351 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
354 * Check if more fragments are pending
356 if (ieee80211_has_morefrags(hdr->frame_control)) {
357 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
358 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
362 * Check if more frames (!= fragments) are pending
364 if (tx_info->flags & IEEE80211_TX_CTL_MORE_FRAMES)
365 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
368 * Beacons and probe responses require the tsf timestamp
369 * to be inserted into the frame, except for a frame that has been injected
370 * through a monitor interface. This latter is needed for testing a
373 if ((ieee80211_is_beacon(hdr->frame_control) ||
374 ieee80211_is_probe_resp(hdr->frame_control)) &&
375 (!(tx_info->flags & IEEE80211_TX_CTL_INJECTED)))
376 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
379 * Determine with what IFS priority this frame should be send.
380 * Set ifs to IFS_SIFS when the this is not the first fragment,
381 * or this fragment came after RTS/CTS.
383 if ((tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) &&
384 !test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) {
385 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
386 txdesc->ifs = IFS_BACKOFF;
388 txdesc->ifs = IFS_SIFS;
391 * Determine rate modulation.
393 hwrate = rt2x00_get_rate(rate->hw_value);
394 txdesc->rate_mode = RATE_MODE_CCK;
395 if (hwrate->flags & DEV_RATE_OFDM)
396 txdesc->rate_mode = RATE_MODE_OFDM;
399 * Apply TX descriptor handling by components
401 rt2x00crypto_create_tx_descriptor(entry, txdesc);
402 rt2x00ht_create_tx_descriptor(entry, txdesc, hwrate);
403 rt2x00queue_create_tx_descriptor_seq(entry, txdesc);
404 rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, hwrate);
407 static int rt2x00queue_write_tx_data(struct queue_entry *entry,
408 struct txentry_desc *txdesc)
410 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
413 * This should not happen, we already checked the entry
414 * was ours. When the hardware disagrees there has been
415 * a queue corruption!
417 if (unlikely(rt2x00dev->ops->lib->get_entry_state &&
418 rt2x00dev->ops->lib->get_entry_state(entry))) {
420 "Corrupt queue %d, accessing entry which is not ours.\n"
421 "Please file bug report to %s.\n",
422 entry->queue->qid, DRV_PROJECT);
427 * Add the requested extra tx headroom in front of the skb.
429 skb_push(entry->skb, rt2x00dev->ops->extra_tx_headroom);
430 memset(entry->skb->data, 0, rt2x00dev->ops->extra_tx_headroom);
433 * Call the driver's write_tx_data function, if it exists.
435 if (rt2x00dev->ops->lib->write_tx_data)
436 rt2x00dev->ops->lib->write_tx_data(entry, txdesc);
439 * Map the skb to DMA.
441 if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
442 rt2x00queue_map_txskb(rt2x00dev, entry->skb);
447 static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
448 struct txentry_desc *txdesc)
450 struct data_queue *queue = entry->queue;
451 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
453 rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, entry->skb, txdesc);
456 * All processing on the frame has been completed, this means
457 * it is now ready to be dumped to userspace through debugfs.
459 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TX, entry->skb);
462 static void rt2x00queue_kick_tx_queue(struct queue_entry *entry,
463 struct txentry_desc *txdesc)
465 struct data_queue *queue = entry->queue;
466 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
469 * Check if we need to kick the queue, there are however a few rules
470 * 1) Don't kick unless this is the last in frame in a burst.
471 * When the burst flag is set, this frame is always followed
472 * by another frame which in some way are related to eachother.
473 * This is true for fragments, RTS or CTS-to-self frames.
474 * 2) Rule 1 can be broken when the available entries
475 * in the queue are less then a certain threshold.
477 if (rt2x00queue_threshold(queue) ||
478 !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
479 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, queue->qid);
482 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
485 struct ieee80211_tx_info *tx_info;
486 struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
487 struct txentry_desc txdesc;
488 struct skb_frame_desc *skbdesc;
489 u8 rate_idx, rate_flags;
491 if (unlikely(rt2x00queue_full(queue)))
494 if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
495 ERROR(queue->rt2x00dev,
496 "Arrived at non-free entry in the non-full queue %d.\n"
497 "Please file bug report to %s.\n",
498 queue->qid, DRV_PROJECT);
503 * Copy all TX descriptor information into txdesc,
504 * after that we are free to use the skb->cb array
505 * for our information.
508 rt2x00queue_create_tx_descriptor(entry, &txdesc);
511 * All information is retrieved from the skb->cb array,
512 * now we should claim ownership of the driver part of that
513 * array, preserving the bitrate index and flags.
515 tx_info = IEEE80211_SKB_CB(skb);
516 rate_idx = tx_info->control.rates[0].idx;
517 rate_flags = tx_info->control.rates[0].flags;
518 skbdesc = get_skb_frame_desc(skb);
519 memset(skbdesc, 0, sizeof(*skbdesc));
520 skbdesc->entry = entry;
521 skbdesc->tx_rate_idx = rate_idx;
522 skbdesc->tx_rate_flags = rate_flags;
525 skbdesc->flags |= SKBDESC_NOT_MAC80211;
528 * When hardware encryption is supported, and this frame
529 * is to be encrypted, we should strip the IV/EIV data from
530 * the frame so we can provide it to the driver separately.
532 if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
533 !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) {
534 if (test_bit(DRIVER_REQUIRE_COPY_IV, &queue->rt2x00dev->flags))
535 rt2x00crypto_tx_copy_iv(skb, &txdesc);
537 rt2x00crypto_tx_remove_iv(skb, &txdesc);
541 * When DMA allocation is required we should guarentee to the
542 * driver that the DMA is aligned to a 4-byte boundary.
543 * However some drivers require L2 padding to pad the payload
544 * rather then the header. This could be a requirement for
545 * PCI and USB devices, while header alignment only is valid
548 if (test_bit(DRIVER_REQUIRE_L2PAD, &queue->rt2x00dev->flags))
549 rt2x00queue_insert_l2pad(entry->skb, txdesc.header_length);
550 else if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
551 rt2x00queue_align_frame(entry->skb);
554 * It could be possible that the queue was corrupted and this
555 * call failed. Since we always return NETDEV_TX_OK to mac80211,
556 * this frame will simply be dropped.
558 if (unlikely(rt2x00queue_write_tx_data(entry, &txdesc))) {
559 clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
564 set_bit(ENTRY_DATA_PENDING, &entry->flags);
566 rt2x00queue_index_inc(queue, Q_INDEX);
567 rt2x00queue_write_tx_descriptor(entry, &txdesc);
568 rt2x00queue_kick_tx_queue(entry, &txdesc);
573 int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
574 struct ieee80211_vif *vif,
575 const bool enable_beacon)
577 struct rt2x00_intf *intf = vif_to_intf(vif);
578 struct skb_frame_desc *skbdesc;
579 struct txentry_desc txdesc;
581 if (unlikely(!intf->beacon))
584 mutex_lock(&intf->beacon_skb_mutex);
587 * Clean up the beacon skb.
589 rt2x00queue_free_skb(rt2x00dev, intf->beacon->skb);
590 intf->beacon->skb = NULL;
592 if (!enable_beacon) {
593 rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev, QID_BEACON);
594 mutex_unlock(&intf->beacon_skb_mutex);
598 intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
599 if (!intf->beacon->skb) {
600 mutex_unlock(&intf->beacon_skb_mutex);
605 * Copy all TX descriptor information into txdesc,
606 * after that we are free to use the skb->cb array
607 * for our information.
609 rt2x00queue_create_tx_descriptor(intf->beacon, &txdesc);
612 * Fill in skb descriptor
614 skbdesc = get_skb_frame_desc(intf->beacon->skb);
615 memset(skbdesc, 0, sizeof(*skbdesc));
616 skbdesc->entry = intf->beacon;
619 * Send beacon to hardware and enable beacon genaration..
621 rt2x00dev->ops->lib->write_beacon(intf->beacon, &txdesc);
623 mutex_unlock(&intf->beacon_skb_mutex);
628 struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
629 const enum data_queue_qid queue)
631 int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
634 return rt2x00dev->rx;
636 if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx)
637 return &rt2x00dev->tx[queue];
642 if (queue == QID_BEACON)
643 return &rt2x00dev->bcn[0];
644 else if (queue == QID_ATIM && atim)
645 return &rt2x00dev->bcn[1];
649 EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
651 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
652 enum queue_index index)
654 struct queue_entry *entry;
655 unsigned long irqflags;
657 if (unlikely(index >= Q_INDEX_MAX)) {
658 ERROR(queue->rt2x00dev,
659 "Entry requested from invalid index type (%d)\n", index);
663 spin_lock_irqsave(&queue->lock, irqflags);
665 entry = &queue->entries[queue->index[index]];
667 spin_unlock_irqrestore(&queue->lock, irqflags);
671 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
673 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
675 unsigned long irqflags;
677 if (unlikely(index >= Q_INDEX_MAX)) {
678 ERROR(queue->rt2x00dev,
679 "Index change on invalid index type (%d)\n", index);
683 spin_lock_irqsave(&queue->lock, irqflags);
685 queue->index[index]++;
686 if (queue->index[index] >= queue->limit)
687 queue->index[index] = 0;
689 if (index == Q_INDEX) {
691 queue->last_index = jiffies;
692 } else if (index == Q_INDEX_DONE) {
695 queue->last_index_done = jiffies;
698 spin_unlock_irqrestore(&queue->lock, irqflags);
701 static void rt2x00queue_reset(struct data_queue *queue)
703 unsigned long irqflags;
705 spin_lock_irqsave(&queue->lock, irqflags);
709 queue->last_index = jiffies;
710 queue->last_index_done = jiffies;
711 memset(queue->index, 0, sizeof(queue->index));
713 spin_unlock_irqrestore(&queue->lock, irqflags);
716 void rt2x00queue_stop_queues(struct rt2x00_dev *rt2x00dev)
718 struct data_queue *queue;
720 txall_queue_for_each(rt2x00dev, queue)
721 rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev, queue->qid);
724 void rt2x00queue_init_queues(struct rt2x00_dev *rt2x00dev)
726 struct data_queue *queue;
729 queue_for_each(rt2x00dev, queue) {
730 rt2x00queue_reset(queue);
732 for (i = 0; i < queue->limit; i++) {
733 queue->entries[i].flags = 0;
735 rt2x00dev->ops->lib->clear_entry(&queue->entries[i]);
740 static int rt2x00queue_alloc_entries(struct data_queue *queue,
741 const struct data_queue_desc *qdesc)
743 struct queue_entry *entries;
744 unsigned int entry_size;
747 rt2x00queue_reset(queue);
749 queue->limit = qdesc->entry_num;
750 queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
751 queue->data_size = qdesc->data_size;
752 queue->desc_size = qdesc->desc_size;
755 * Allocate all queue entries.
757 entry_size = sizeof(*entries) + qdesc->priv_size;
758 entries = kzalloc(queue->limit * entry_size, GFP_KERNEL);
762 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
763 ( ((char *)(__base)) + ((__limit) * (__esize)) + \
764 ((__index) * (__psize)) )
766 for (i = 0; i < queue->limit; i++) {
767 entries[i].flags = 0;
768 entries[i].queue = queue;
769 entries[i].skb = NULL;
770 entries[i].entry_idx = i;
771 entries[i].priv_data =
772 QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
773 sizeof(*entries), qdesc->priv_size);
776 #undef QUEUE_ENTRY_PRIV_OFFSET
778 queue->entries = entries;
783 static void rt2x00queue_free_skbs(struct rt2x00_dev *rt2x00dev,
784 struct data_queue *queue)
791 for (i = 0; i < queue->limit; i++) {
792 if (queue->entries[i].skb)
793 rt2x00queue_free_skb(rt2x00dev, queue->entries[i].skb);
797 static int rt2x00queue_alloc_rxskbs(struct rt2x00_dev *rt2x00dev,
798 struct data_queue *queue)
803 for (i = 0; i < queue->limit; i++) {
804 skb = rt2x00queue_alloc_rxskb(rt2x00dev, &queue->entries[i]);
807 queue->entries[i].skb = skb;
813 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
815 struct data_queue *queue;
818 status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
822 tx_queue_for_each(rt2x00dev, queue) {
823 status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
828 status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
832 if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) {
833 status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1],
834 rt2x00dev->ops->atim);
839 status = rt2x00queue_alloc_rxskbs(rt2x00dev, rt2x00dev->rx);
846 ERROR(rt2x00dev, "Queue entries allocation failed.\n");
848 rt2x00queue_uninitialize(rt2x00dev);
853 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
855 struct data_queue *queue;
857 rt2x00queue_free_skbs(rt2x00dev, rt2x00dev->rx);
859 queue_for_each(rt2x00dev, queue) {
860 kfree(queue->entries);
861 queue->entries = NULL;
865 static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
866 struct data_queue *queue, enum data_queue_qid qid)
868 spin_lock_init(&queue->lock);
870 queue->rt2x00dev = rt2x00dev;
878 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
880 struct data_queue *queue;
881 enum data_queue_qid qid;
882 unsigned int req_atim =
883 !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
886 * We need the following queues:
890 * Atim: 1 (if required)
892 rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim;
894 queue = kzalloc(rt2x00dev->data_queues * sizeof(*queue), GFP_KERNEL);
896 ERROR(rt2x00dev, "Queue allocation failed.\n");
901 * Initialize pointers
903 rt2x00dev->rx = queue;
904 rt2x00dev->tx = &queue[1];
905 rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues];
908 * Initialize queue parameters.
910 * TX: qid = QID_AC_BE + index
911 * TX: cw_min: 2^5 = 32.
912 * TX: cw_max: 2^10 = 1024.
913 * BCN: qid = QID_BEACON
914 * ATIM: qid = QID_ATIM
916 rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
919 tx_queue_for_each(rt2x00dev, queue)
920 rt2x00queue_init(rt2x00dev, queue, qid++);
922 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[0], QID_BEACON);
924 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[1], QID_ATIM);
929 void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
931 kfree(rt2x00dev->rx);
932 rt2x00dev->rx = NULL;
933 rt2x00dev->tx = NULL;
934 rt2x00dev->bcn = NULL;