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->hw->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->hw->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->hw->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 frame_length = skb->len;
181 unsigned int header_align = ALIGN_SIZE(skb, 0);
182 unsigned int payload_align = ALIGN_SIZE(skb, header_length);
183 unsigned int l2pad = L2PAD_SIZE(header_length);
185 if (header_align == payload_align) {
187 * Both header and payload must be moved the same
188 * amount of bytes to align them properly. This means
189 * we don't use the L2 padding but just move the entire
192 rt2x00queue_align_frame(skb);
193 } else if (!payload_align) {
195 * Simple L2 padding, only the header needs to be moved,
196 * the payload is already properly aligned.
198 skb_push(skb, header_align);
199 memmove(skb->data, skb->data + header_align, header_length);
203 * Complicated L2 padding, both header and payload need
204 * to be moved. By default we only move to the start
205 * of the buffer, so our header alignment needs to be
206 * increased if there is not enough room for the header
209 if (payload_align > header_align)
212 skb_push(skb, header_align);
213 memmove(skb->data, skb->data + header_align, header_length);
214 memmove(skb->data + header_length + l2pad,
215 skb->data + header_length + l2pad + payload_align,
216 frame_length - header_length);
217 skb_trim(skb, frame_length + l2pad);
221 void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length)
223 unsigned int l2pad = L2PAD_SIZE(header_length);
228 memmove(skb->data + l2pad, skb->data, header_length);
229 skb_pull(skb, l2pad);
232 static void rt2x00queue_create_tx_descriptor_seq(struct queue_entry *entry,
233 struct txentry_desc *txdesc)
235 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
236 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
237 struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
238 unsigned long irqflags;
240 if (!(tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) ||
241 unlikely(!tx_info->control.vif))
245 * Hardware should insert sequence counter.
246 * FIXME: We insert a software sequence counter first for
247 * hardware that doesn't support hardware sequence counting.
249 * This is wrong because beacons are not getting sequence
250 * numbers assigned properly.
252 * A secondary problem exists for drivers that cannot toggle
253 * sequence counting per-frame, since those will override the
254 * sequence counter given by mac80211.
256 spin_lock_irqsave(&intf->seqlock, irqflags);
258 if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
260 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
261 hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
263 spin_unlock_irqrestore(&intf->seqlock, irqflags);
265 __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
268 static void rt2x00queue_create_tx_descriptor_plcp(struct queue_entry *entry,
269 struct txentry_desc *txdesc,
270 const struct rt2x00_rate *hwrate)
272 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
273 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
274 struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
275 unsigned int data_length;
276 unsigned int duration;
277 unsigned int residual;
279 /* Data length + CRC + Crypto overhead (IV/EIV/ICV/MIC) */
280 data_length = entry->skb->len + 4;
281 data_length += rt2x00crypto_tx_overhead(rt2x00dev, entry->skb);
285 * Length calculation depends on OFDM/CCK rate.
287 txdesc->signal = hwrate->plcp;
288 txdesc->service = 0x04;
290 if (hwrate->flags & DEV_RATE_OFDM) {
291 txdesc->length_high = (data_length >> 6) & 0x3f;
292 txdesc->length_low = data_length & 0x3f;
295 * Convert length to microseconds.
297 residual = GET_DURATION_RES(data_length, hwrate->bitrate);
298 duration = GET_DURATION(data_length, hwrate->bitrate);
304 * Check if we need to set the Length Extension
306 if (hwrate->bitrate == 110 && residual <= 30)
307 txdesc->service |= 0x80;
310 txdesc->length_high = (duration >> 8) & 0xff;
311 txdesc->length_low = duration & 0xff;
314 * When preamble is enabled we should set the
315 * preamble bit for the signal.
317 if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
318 txdesc->signal |= 0x08;
322 static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
323 struct txentry_desc *txdesc)
325 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
326 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
327 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
328 struct ieee80211_rate *rate =
329 ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
330 const struct rt2x00_rate *hwrate;
332 memset(txdesc, 0, sizeof(*txdesc));
335 * Initialize information from queue
337 txdesc->queue = entry->queue->qid;
338 txdesc->cw_min = entry->queue->cw_min;
339 txdesc->cw_max = entry->queue->cw_max;
340 txdesc->aifs = entry->queue->aifs;
343 * Header and alignment information.
345 txdesc->header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
346 if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
347 txdesc->l2pad = L2PAD_SIZE(txdesc->header_length);
350 * Check whether this frame is to be acked.
352 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
353 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
356 * Check if this is a RTS/CTS frame
358 if (ieee80211_is_rts(hdr->frame_control) ||
359 ieee80211_is_cts(hdr->frame_control)) {
360 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
361 if (ieee80211_is_rts(hdr->frame_control))
362 __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
364 __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
365 if (tx_info->control.rts_cts_rate_idx >= 0)
367 ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
371 * Determine retry information.
373 txdesc->retry_limit = tx_info->control.rates[0].count - 1;
374 if (txdesc->retry_limit >= rt2x00dev->long_retry)
375 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
378 * Check if more fragments are pending
380 if (ieee80211_has_morefrags(hdr->frame_control) ||
381 (tx_info->flags & IEEE80211_TX_CTL_MORE_FRAMES)) {
382 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
383 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
387 * Beacons and probe responses require the tsf timestamp
388 * to be inserted into the frame, except for a frame that has been injected
389 * through a monitor interface. This latter is needed for testing a
392 if ((ieee80211_is_beacon(hdr->frame_control) ||
393 ieee80211_is_probe_resp(hdr->frame_control)) &&
394 (!(tx_info->flags & IEEE80211_TX_CTL_INJECTED)))
395 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
398 * Determine with what IFS priority this frame should be send.
399 * Set ifs to IFS_SIFS when the this is not the first fragment,
400 * or this fragment came after RTS/CTS.
402 if ((tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) &&
403 !test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) {
404 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
405 txdesc->ifs = IFS_BACKOFF;
407 txdesc->ifs = IFS_SIFS;
410 * Determine rate modulation.
412 hwrate = rt2x00_get_rate(rate->hw_value);
413 txdesc->rate_mode = RATE_MODE_CCK;
414 if (hwrate->flags & DEV_RATE_OFDM)
415 txdesc->rate_mode = RATE_MODE_OFDM;
418 * Apply TX descriptor handling by components
420 rt2x00crypto_create_tx_descriptor(entry, txdesc);
421 rt2x00ht_create_tx_descriptor(entry, txdesc, hwrate);
422 rt2x00queue_create_tx_descriptor_seq(entry, txdesc);
423 rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, hwrate);
426 static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
427 struct txentry_desc *txdesc)
429 struct data_queue *queue = entry->queue;
430 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
432 rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, entry->skb, txdesc);
435 * All processing on the frame has been completed, this means
436 * it is now ready to be dumped to userspace through debugfs.
438 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TX, entry->skb);
441 * Check if we need to kick the queue, there are however a few rules
442 * 1) Don't kick beacon queue
443 * 2) Don't kick unless this is the last in frame in a burst.
444 * When the burst flag is set, this frame is always followed
445 * by another frame which in some way are related to eachother.
446 * This is true for fragments, RTS or CTS-to-self frames.
447 * 3) Rule 2 can be broken when the available entries
448 * in the queue are less then a certain threshold.
450 if (entry->queue->qid == QID_BEACON)
453 if (rt2x00queue_threshold(queue) ||
454 !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
455 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, queue->qid);
458 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
461 struct ieee80211_tx_info *tx_info;
462 struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
463 struct txentry_desc txdesc;
464 struct skb_frame_desc *skbdesc;
465 u8 rate_idx, rate_flags;
467 if (unlikely(rt2x00queue_full(queue)))
470 if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
471 ERROR(queue->rt2x00dev,
472 "Arrived at non-free entry in the non-full queue %d.\n"
473 "Please file bug report to %s.\n",
474 queue->qid, DRV_PROJECT);
479 * Copy all TX descriptor information into txdesc,
480 * after that we are free to use the skb->cb array
481 * for our information.
484 rt2x00queue_create_tx_descriptor(entry, &txdesc);
487 * All information is retrieved from the skb->cb array,
488 * now we should claim ownership of the driver part of that
489 * array, preserving the bitrate index and flags.
491 tx_info = IEEE80211_SKB_CB(skb);
492 rate_idx = tx_info->control.rates[0].idx;
493 rate_flags = tx_info->control.rates[0].flags;
494 skbdesc = get_skb_frame_desc(skb);
495 memset(skbdesc, 0, sizeof(*skbdesc));
496 skbdesc->entry = entry;
497 skbdesc->tx_rate_idx = rate_idx;
498 skbdesc->tx_rate_flags = rate_flags;
501 skbdesc->flags |= SKBDESC_NOT_MAC80211;
504 * When hardware encryption is supported, and this frame
505 * is to be encrypted, we should strip the IV/EIV data from
506 * the frame so we can provide it to the driver seperately.
508 if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
509 !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) {
510 if (test_bit(DRIVER_REQUIRE_COPY_IV, &queue->rt2x00dev->flags))
511 rt2x00crypto_tx_copy_iv(skb, &txdesc);
513 rt2x00crypto_tx_remove_iv(skb, &txdesc);
517 * When DMA allocation is required we should guarentee to the
518 * driver that the DMA is aligned to a 4-byte boundary.
519 * However some drivers require L2 padding to pad the payload
520 * rather then the header. This could be a requirement for
521 * PCI and USB devices, while header alignment only is valid
524 if (test_bit(DRIVER_REQUIRE_L2PAD, &queue->rt2x00dev->flags))
525 rt2x00queue_insert_l2pad(entry->skb, txdesc.header_length);
526 else if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
527 rt2x00queue_align_frame(entry->skb);
530 * It could be possible that the queue was corrupted and this
531 * call failed. Since we always return NETDEV_TX_OK to mac80211,
532 * this frame will simply be dropped.
534 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);
551 int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
552 struct ieee80211_vif *vif,
553 const bool enable_beacon)
555 struct rt2x00_intf *intf = vif_to_intf(vif);
556 struct skb_frame_desc *skbdesc;
557 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 * For the descriptor we use a local array from where the
592 * driver can move it to the correct location required for
595 memset(desc, 0, sizeof(desc));
598 * Fill in skb descriptor
600 skbdesc = get_skb_frame_desc(intf->beacon->skb);
601 memset(skbdesc, 0, sizeof(*skbdesc));
602 skbdesc->desc = desc;
603 skbdesc->desc_len = intf->beacon->queue->desc_size;
604 skbdesc->entry = intf->beacon;
607 * Write TX descriptor into reserved room in front of the beacon.
609 rt2x00queue_write_tx_descriptor(intf->beacon, &txdesc);
612 * Send beacon to hardware.
613 * Also enable beacon generation, which might have been disabled
614 * by the driver during the config_beacon() callback function.
616 rt2x00dev->ops->lib->write_beacon(intf->beacon);
617 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, QID_BEACON);
619 mutex_unlock(&intf->beacon_skb_mutex);
624 struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
625 const enum data_queue_qid queue)
627 int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
630 return rt2x00dev->rx;
632 if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx)
633 return &rt2x00dev->tx[queue];
638 if (queue == QID_BEACON)
639 return &rt2x00dev->bcn[0];
640 else if (queue == QID_ATIM && atim)
641 return &rt2x00dev->bcn[1];
645 EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
647 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
648 enum queue_index index)
650 struct queue_entry *entry;
651 unsigned long irqflags;
653 if (unlikely(index >= Q_INDEX_MAX)) {
654 ERROR(queue->rt2x00dev,
655 "Entry requested from invalid index type (%d)\n", index);
659 spin_lock_irqsave(&queue->lock, irqflags);
661 entry = &queue->entries[queue->index[index]];
663 spin_unlock_irqrestore(&queue->lock, irqflags);
667 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
669 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
671 unsigned long irqflags;
673 if (unlikely(index >= Q_INDEX_MAX)) {
674 ERROR(queue->rt2x00dev,
675 "Index change on invalid index type (%d)\n", index);
679 spin_lock_irqsave(&queue->lock, irqflags);
681 queue->index[index]++;
682 if (queue->index[index] >= queue->limit)
683 queue->index[index] = 0;
685 if (index == Q_INDEX) {
687 } else if (index == Q_INDEX_DONE) {
692 spin_unlock_irqrestore(&queue->lock, irqflags);
695 static void rt2x00queue_reset(struct data_queue *queue)
697 unsigned long irqflags;
699 spin_lock_irqsave(&queue->lock, irqflags);
703 memset(queue->index, 0, sizeof(queue->index));
705 spin_unlock_irqrestore(&queue->lock, irqflags);
708 void rt2x00queue_stop_queues(struct rt2x00_dev *rt2x00dev)
710 struct data_queue *queue;
712 txall_queue_for_each(rt2x00dev, queue)
713 rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev, queue->qid);
716 void rt2x00queue_init_queues(struct rt2x00_dev *rt2x00dev)
718 struct data_queue *queue;
721 queue_for_each(rt2x00dev, queue) {
722 rt2x00queue_reset(queue);
724 for (i = 0; i < queue->limit; i++) {
725 queue->entries[i].flags = 0;
727 rt2x00dev->ops->lib->clear_entry(&queue->entries[i]);
732 static int rt2x00queue_alloc_entries(struct data_queue *queue,
733 const struct data_queue_desc *qdesc)
735 struct queue_entry *entries;
736 unsigned int entry_size;
739 rt2x00queue_reset(queue);
741 queue->limit = qdesc->entry_num;
742 queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
743 queue->data_size = qdesc->data_size;
744 queue->desc_size = qdesc->desc_size;
747 * Allocate all queue entries.
749 entry_size = sizeof(*entries) + qdesc->priv_size;
750 entries = kzalloc(queue->limit * entry_size, GFP_KERNEL);
754 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
755 ( ((char *)(__base)) + ((__limit) * (__esize)) + \
756 ((__index) * (__psize)) )
758 for (i = 0; i < queue->limit; i++) {
759 entries[i].flags = 0;
760 entries[i].queue = queue;
761 entries[i].skb = NULL;
762 entries[i].entry_idx = i;
763 entries[i].priv_data =
764 QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
765 sizeof(*entries), qdesc->priv_size);
768 #undef QUEUE_ENTRY_PRIV_OFFSET
770 queue->entries = entries;
775 static void rt2x00queue_free_skbs(struct rt2x00_dev *rt2x00dev,
776 struct data_queue *queue)
783 for (i = 0; i < queue->limit; i++) {
784 if (queue->entries[i].skb)
785 rt2x00queue_free_skb(rt2x00dev, queue->entries[i].skb);
789 static int rt2x00queue_alloc_rxskbs(struct rt2x00_dev *rt2x00dev,
790 struct data_queue *queue)
795 for (i = 0; i < queue->limit; i++) {
796 skb = rt2x00queue_alloc_rxskb(rt2x00dev, &queue->entries[i]);
799 queue->entries[i].skb = skb;
805 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
807 struct data_queue *queue;
810 status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
814 tx_queue_for_each(rt2x00dev, queue) {
815 status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
820 status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
824 if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) {
825 status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1],
826 rt2x00dev->ops->atim);
831 status = rt2x00queue_alloc_rxskbs(rt2x00dev, rt2x00dev->rx);
838 ERROR(rt2x00dev, "Queue entries allocation failed.\n");
840 rt2x00queue_uninitialize(rt2x00dev);
845 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
847 struct data_queue *queue;
849 rt2x00queue_free_skbs(rt2x00dev, rt2x00dev->rx);
851 queue_for_each(rt2x00dev, queue) {
852 kfree(queue->entries);
853 queue->entries = NULL;
857 static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
858 struct data_queue *queue, enum data_queue_qid qid)
860 spin_lock_init(&queue->lock);
862 queue->rt2x00dev = rt2x00dev;
870 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
872 struct data_queue *queue;
873 enum data_queue_qid qid;
874 unsigned int req_atim =
875 !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
878 * We need the following queues:
882 * Atim: 1 (if required)
884 rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim;
886 queue = kzalloc(rt2x00dev->data_queues * sizeof(*queue), GFP_KERNEL);
888 ERROR(rt2x00dev, "Queue allocation failed.\n");
893 * Initialize pointers
895 rt2x00dev->rx = queue;
896 rt2x00dev->tx = &queue[1];
897 rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues];
900 * Initialize queue parameters.
902 * TX: qid = QID_AC_BE + index
903 * TX: cw_min: 2^5 = 32.
904 * TX: cw_max: 2^10 = 1024.
905 * BCN: qid = QID_BEACON
906 * ATIM: qid = QID_ATIM
908 rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
911 tx_queue_for_each(rt2x00dev, queue)
912 rt2x00queue_init(rt2x00dev, queue, qid++);
914 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[0], QID_BEACON);
916 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[1], QID_ATIM);
921 void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
923 kfree(rt2x00dev->rx);
924 rt2x00dev->rx = NULL;
925 rt2x00dev->tx = NULL;
926 rt2x00dev->bcn = NULL;