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 queue_entry *entry)
38 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
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 queue_entry *entry)
102 struct device *dev = entry->queue->rt2x00dev->dev;
103 struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
106 dma_map_single(dev, entry->skb->data, entry->skb->len, DMA_TO_DEVICE);
107 skbdesc->flags |= SKBDESC_DMA_MAPPED_TX;
109 EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb);
111 void rt2x00queue_unmap_skb(struct queue_entry *entry)
113 struct device *dev = entry->queue->rt2x00dev->dev;
114 struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
116 if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) {
117 dma_unmap_single(dev, skbdesc->skb_dma, entry->skb->len,
119 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_RX;
120 } else if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) {
121 dma_unmap_single(dev, skbdesc->skb_dma, entry->skb->len,
123 skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX;
126 EXPORT_SYMBOL_GPL(rt2x00queue_unmap_skb);
128 void rt2x00queue_free_skb(struct queue_entry *entry)
133 rt2x00queue_unmap_skb(entry);
134 dev_kfree_skb_any(entry->skb);
138 void rt2x00queue_align_frame(struct sk_buff *skb)
140 unsigned int frame_length = skb->len;
141 unsigned int align = ALIGN_SIZE(skb, 0);
146 skb_push(skb, align);
147 memmove(skb->data, skb->data + align, frame_length);
148 skb_trim(skb, frame_length);
151 void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int header_length)
153 unsigned int payload_length = skb->len - header_length;
154 unsigned int header_align = ALIGN_SIZE(skb, 0);
155 unsigned int payload_align = ALIGN_SIZE(skb, header_length);
156 unsigned int l2pad = payload_length ? L2PAD_SIZE(header_length) : 0;
159 * Adjust the header alignment if the payload needs to be moved more
162 if (payload_align > header_align)
165 /* There is nothing to do if no alignment is needed */
169 /* Reserve the amount of space needed in front of the frame */
170 skb_push(skb, header_align);
175 memmove(skb->data, skb->data + header_align, header_length);
177 /* Move the payload, if present and if required */
178 if (payload_length && payload_align)
179 memmove(skb->data + header_length + l2pad,
180 skb->data + header_length + l2pad + payload_align,
183 /* Trim the skb to the correct size */
184 skb_trim(skb, header_length + l2pad + payload_length);
187 void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length)
190 * L2 padding is only present if the skb contains more than just the
191 * IEEE 802.11 header.
193 unsigned int l2pad = (skb->len > header_length) ?
194 L2PAD_SIZE(header_length) : 0;
199 memmove(skb->data + l2pad, skb->data, header_length);
200 skb_pull(skb, l2pad);
203 static void rt2x00queue_create_tx_descriptor_seq(struct queue_entry *entry,
204 struct txentry_desc *txdesc)
206 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
207 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
208 struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
209 unsigned long irqflags;
211 if (!(tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ))
214 __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
216 if (!test_bit(DRIVER_REQUIRE_SW_SEQNO, &entry->queue->rt2x00dev->flags))
220 * The hardware is not able to insert a sequence number. Assign a
221 * software generated one here.
223 * This is wrong because beacons are not getting sequence
224 * numbers assigned properly.
226 * A secondary problem exists for drivers that cannot toggle
227 * sequence counting per-frame, since those will override the
228 * sequence counter given by mac80211.
230 spin_lock_irqsave(&intf->seqlock, irqflags);
232 if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
234 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
235 hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
237 spin_unlock_irqrestore(&intf->seqlock, irqflags);
241 static void rt2x00queue_create_tx_descriptor_plcp(struct queue_entry *entry,
242 struct txentry_desc *txdesc,
243 const struct rt2x00_rate *hwrate)
245 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
246 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
247 struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
248 unsigned int data_length;
249 unsigned int duration;
250 unsigned int residual;
253 * Determine with what IFS priority this frame should be send.
254 * Set ifs to IFS_SIFS when the this is not the first fragment,
255 * or this fragment came after RTS/CTS.
257 if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
258 txdesc->u.plcp.ifs = IFS_BACKOFF;
260 txdesc->u.plcp.ifs = IFS_SIFS;
262 /* Data length + CRC + Crypto overhead (IV/EIV/ICV/MIC) */
263 data_length = entry->skb->len + 4;
264 data_length += rt2x00crypto_tx_overhead(rt2x00dev, entry->skb);
268 * Length calculation depends on OFDM/CCK rate.
270 txdesc->u.plcp.signal = hwrate->plcp;
271 txdesc->u.plcp.service = 0x04;
273 if (hwrate->flags & DEV_RATE_OFDM) {
274 txdesc->u.plcp.length_high = (data_length >> 6) & 0x3f;
275 txdesc->u.plcp.length_low = data_length & 0x3f;
278 * Convert length to microseconds.
280 residual = GET_DURATION_RES(data_length, hwrate->bitrate);
281 duration = GET_DURATION(data_length, hwrate->bitrate);
287 * Check if we need to set the Length Extension
289 if (hwrate->bitrate == 110 && residual <= 30)
290 txdesc->u.plcp.service |= 0x80;
293 txdesc->u.plcp.length_high = (duration >> 8) & 0xff;
294 txdesc->u.plcp.length_low = duration & 0xff;
297 * When preamble is enabled we should set the
298 * preamble bit for the signal.
300 if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
301 txdesc->u.plcp.signal |= 0x08;
305 static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
306 struct txentry_desc *txdesc)
308 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
309 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
310 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
311 struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
312 struct ieee80211_rate *rate;
313 const struct rt2x00_rate *hwrate = NULL;
315 memset(txdesc, 0, sizeof(*txdesc));
318 * Header and frame information.
320 txdesc->length = entry->skb->len;
321 txdesc->header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
324 * Check whether this frame is to be acked.
326 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
327 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
330 * Check if this is a RTS/CTS frame
332 if (ieee80211_is_rts(hdr->frame_control) ||
333 ieee80211_is_cts(hdr->frame_control)) {
334 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
335 if (ieee80211_is_rts(hdr->frame_control))
336 __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
338 __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
339 if (tx_info->control.rts_cts_rate_idx >= 0)
341 ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
345 * Determine retry information.
347 txdesc->retry_limit = tx_info->control.rates[0].count - 1;
348 if (txdesc->retry_limit >= rt2x00dev->long_retry)
349 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
352 * Check if more fragments are pending
354 if (ieee80211_has_morefrags(hdr->frame_control)) {
355 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
356 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
360 * Check if more frames (!= fragments) are pending
362 if (tx_info->flags & IEEE80211_TX_CTL_MORE_FRAMES)
363 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
366 * Beacons and probe responses require the tsf timestamp
367 * to be inserted into the frame.
369 if (ieee80211_is_beacon(hdr->frame_control) ||
370 ieee80211_is_probe_resp(hdr->frame_control))
371 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
373 if ((tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) &&
374 !test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags))
375 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
378 * Determine rate modulation.
380 if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
381 txdesc->rate_mode = RATE_MODE_HT_GREENFIELD;
382 else if (txrate->flags & IEEE80211_TX_RC_MCS)
383 txdesc->rate_mode = RATE_MODE_HT_MIX;
385 rate = ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
386 hwrate = rt2x00_get_rate(rate->hw_value);
387 if (hwrate->flags & DEV_RATE_OFDM)
388 txdesc->rate_mode = RATE_MODE_OFDM;
390 txdesc->rate_mode = RATE_MODE_CCK;
394 * Apply TX descriptor handling by components
396 rt2x00crypto_create_tx_descriptor(entry, txdesc);
397 rt2x00queue_create_tx_descriptor_seq(entry, txdesc);
399 if (test_bit(DRIVER_REQUIRE_HT_TX_DESC, &rt2x00dev->flags))
400 rt2x00ht_create_tx_descriptor(entry, txdesc, hwrate);
402 rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, hwrate);
405 static int rt2x00queue_write_tx_data(struct queue_entry *entry,
406 struct txentry_desc *txdesc)
408 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
411 * This should not happen, we already checked the entry
412 * was ours. When the hardware disagrees there has been
413 * a queue corruption!
415 if (unlikely(rt2x00dev->ops->lib->get_entry_state &&
416 rt2x00dev->ops->lib->get_entry_state(entry))) {
418 "Corrupt queue %d, accessing entry which is not ours.\n"
419 "Please file bug report to %s.\n",
420 entry->queue->qid, DRV_PROJECT);
425 * Add the requested extra tx headroom in front of the skb.
427 skb_push(entry->skb, rt2x00dev->ops->extra_tx_headroom);
428 memset(entry->skb->data, 0, rt2x00dev->ops->extra_tx_headroom);
431 * Call the driver's write_tx_data function, if it exists.
433 if (rt2x00dev->ops->lib->write_tx_data)
434 rt2x00dev->ops->lib->write_tx_data(entry, txdesc);
437 * Map the skb to DMA.
439 if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
440 rt2x00queue_map_txskb(entry);
445 static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
446 struct txentry_desc *txdesc)
448 struct data_queue *queue = entry->queue;
450 queue->rt2x00dev->ops->lib->write_tx_desc(entry, txdesc);
453 * All processing on the frame has been completed, this means
454 * it is now ready to be dumped to userspace through debugfs.
456 rt2x00debug_dump_frame(queue->rt2x00dev, DUMP_FRAME_TX, entry->skb);
459 static void rt2x00queue_kick_tx_queue(struct data_queue *queue,
460 struct txentry_desc *txdesc)
463 * Check if we need to kick the queue, there are however a few rules
464 * 1) Don't kick unless this is the last in frame in a burst.
465 * When the burst flag is set, this frame is always followed
466 * by another frame which in some way are related to eachother.
467 * This is true for fragments, RTS or CTS-to-self frames.
468 * 2) Rule 1 can be broken when the available entries
469 * in the queue are less then a certain threshold.
471 if (rt2x00queue_threshold(queue) ||
472 !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
473 queue->rt2x00dev->ops->lib->kick_queue(queue);
476 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
479 struct ieee80211_tx_info *tx_info;
480 struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
481 struct txentry_desc txdesc;
482 struct skb_frame_desc *skbdesc;
483 u8 rate_idx, rate_flags;
485 if (unlikely(rt2x00queue_full(queue)))
488 if (unlikely(test_and_set_bit(ENTRY_OWNER_DEVICE_DATA,
490 ERROR(queue->rt2x00dev,
491 "Arrived at non-free entry in the non-full queue %d.\n"
492 "Please file bug report to %s.\n",
493 queue->qid, DRV_PROJECT);
498 * Copy all TX descriptor information into txdesc,
499 * after that we are free to use the skb->cb array
500 * for our information.
503 rt2x00queue_create_tx_descriptor(entry, &txdesc);
506 * All information is retrieved from the skb->cb array,
507 * now we should claim ownership of the driver part of that
508 * array, preserving the bitrate index and flags.
510 tx_info = IEEE80211_SKB_CB(skb);
511 rate_idx = tx_info->control.rates[0].idx;
512 rate_flags = tx_info->control.rates[0].flags;
513 skbdesc = get_skb_frame_desc(skb);
514 memset(skbdesc, 0, sizeof(*skbdesc));
515 skbdesc->entry = entry;
516 skbdesc->tx_rate_idx = rate_idx;
517 skbdesc->tx_rate_flags = rate_flags;
520 skbdesc->flags |= SKBDESC_NOT_MAC80211;
523 * When hardware encryption is supported, and this frame
524 * is to be encrypted, we should strip the IV/EIV data from
525 * the frame so we can provide it to the driver separately.
527 if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
528 !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) {
529 if (test_bit(DRIVER_REQUIRE_COPY_IV, &queue->rt2x00dev->flags))
530 rt2x00crypto_tx_copy_iv(skb, &txdesc);
532 rt2x00crypto_tx_remove_iv(skb, &txdesc);
536 * When DMA allocation is required we should guarentee to the
537 * driver that the DMA is aligned to a 4-byte boundary.
538 * However some drivers require L2 padding to pad the payload
539 * rather then the header. This could be a requirement for
540 * PCI and USB devices, while header alignment only is valid
543 if (test_bit(DRIVER_REQUIRE_L2PAD, &queue->rt2x00dev->flags))
544 rt2x00queue_insert_l2pad(entry->skb, txdesc.header_length);
545 else if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
546 rt2x00queue_align_frame(entry->skb);
549 * It could be possible that the queue was corrupted and this
550 * call failed. Since we always return NETDEV_TX_OK to mac80211,
551 * this frame will simply be dropped.
553 if (unlikely(rt2x00queue_write_tx_data(entry, &txdesc))) {
554 clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
559 set_bit(ENTRY_DATA_PENDING, &entry->flags);
561 rt2x00queue_index_inc(queue, Q_INDEX);
562 rt2x00queue_write_tx_descriptor(entry, &txdesc);
563 rt2x00queue_kick_tx_queue(queue, &txdesc);
568 int rt2x00queue_clear_beacon(struct rt2x00_dev *rt2x00dev,
569 struct ieee80211_vif *vif)
571 struct rt2x00_intf *intf = vif_to_intf(vif);
573 if (unlikely(!intf->beacon))
576 mutex_lock(&intf->beacon_skb_mutex);
579 * Clean up the beacon skb.
581 rt2x00queue_free_skb(intf->beacon);
584 * Clear beacon (single bssid devices don't need to clear the beacon
585 * since the beacon queue will get stopped anyway).
587 if (rt2x00dev->ops->lib->clear_beacon)
588 rt2x00dev->ops->lib->clear_beacon(intf->beacon);
590 mutex_unlock(&intf->beacon_skb_mutex);
595 int rt2x00queue_update_beacon_locked(struct rt2x00_dev *rt2x00dev,
596 struct ieee80211_vif *vif)
598 struct rt2x00_intf *intf = vif_to_intf(vif);
599 struct skb_frame_desc *skbdesc;
600 struct txentry_desc txdesc;
602 if (unlikely(!intf->beacon))
606 * Clean up the beacon skb.
608 rt2x00queue_free_skb(intf->beacon);
610 intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
611 if (!intf->beacon->skb)
615 * Copy all TX descriptor information into txdesc,
616 * after that we are free to use the skb->cb array
617 * for our information.
619 rt2x00queue_create_tx_descriptor(intf->beacon, &txdesc);
622 * Fill in skb descriptor
624 skbdesc = get_skb_frame_desc(intf->beacon->skb);
625 memset(skbdesc, 0, sizeof(*skbdesc));
626 skbdesc->entry = intf->beacon;
629 * Send beacon to hardware.
631 rt2x00dev->ops->lib->write_beacon(intf->beacon, &txdesc);
637 int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
638 struct ieee80211_vif *vif)
640 struct rt2x00_intf *intf = vif_to_intf(vif);
643 mutex_lock(&intf->beacon_skb_mutex);
644 ret = rt2x00queue_update_beacon_locked(rt2x00dev, vif);
645 mutex_unlock(&intf->beacon_skb_mutex);
650 void rt2x00queue_for_each_entry(struct data_queue *queue,
651 enum queue_index start,
652 enum queue_index end,
653 void (*fn)(struct queue_entry *entry))
655 unsigned long irqflags;
656 unsigned int index_start;
657 unsigned int index_end;
660 if (unlikely(start >= Q_INDEX_MAX || end >= Q_INDEX_MAX)) {
661 ERROR(queue->rt2x00dev,
662 "Entry requested from invalid index range (%d - %d)\n",
668 * Only protect the range we are going to loop over,
669 * if during our loop a extra entry is set to pending
670 * it should not be kicked during this run, since it
671 * is part of another TX operation.
673 spin_lock_irqsave(&queue->index_lock, irqflags);
674 index_start = queue->index[start];
675 index_end = queue->index[end];
676 spin_unlock_irqrestore(&queue->index_lock, irqflags);
679 * Start from the TX done pointer, this guarentees that we will
680 * send out all frames in the correct order.
682 if (index_start < index_end) {
683 for (i = index_start; i < index_end; i++)
684 fn(&queue->entries[i]);
686 for (i = index_start; i < queue->limit; i++)
687 fn(&queue->entries[i]);
689 for (i = 0; i < index_end; i++)
690 fn(&queue->entries[i]);
693 EXPORT_SYMBOL_GPL(rt2x00queue_for_each_entry);
695 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
696 enum queue_index index)
698 struct queue_entry *entry;
699 unsigned long irqflags;
701 if (unlikely(index >= Q_INDEX_MAX)) {
702 ERROR(queue->rt2x00dev,
703 "Entry requested from invalid index type (%d)\n", index);
707 spin_lock_irqsave(&queue->index_lock, irqflags);
709 entry = &queue->entries[queue->index[index]];
711 spin_unlock_irqrestore(&queue->index_lock, irqflags);
715 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
717 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
719 unsigned long irqflags;
721 if (unlikely(index >= Q_INDEX_MAX)) {
722 ERROR(queue->rt2x00dev,
723 "Index change on invalid index type (%d)\n", index);
727 spin_lock_irqsave(&queue->index_lock, irqflags);
729 queue->index[index]++;
730 if (queue->index[index] >= queue->limit)
731 queue->index[index] = 0;
733 queue->last_action[index] = jiffies;
735 if (index == Q_INDEX) {
737 } else if (index == Q_INDEX_DONE) {
742 spin_unlock_irqrestore(&queue->index_lock, irqflags);
745 void rt2x00queue_pause_queue(struct data_queue *queue)
747 if (!test_bit(DEVICE_STATE_PRESENT, &queue->rt2x00dev->flags) ||
748 !test_bit(QUEUE_STARTED, &queue->flags) ||
749 test_and_set_bit(QUEUE_PAUSED, &queue->flags))
752 switch (queue->qid) {
758 * For TX queues, we have to disable the queue
761 ieee80211_stop_queue(queue->rt2x00dev->hw, queue->qid);
767 EXPORT_SYMBOL_GPL(rt2x00queue_pause_queue);
769 void rt2x00queue_unpause_queue(struct data_queue *queue)
771 if (!test_bit(DEVICE_STATE_PRESENT, &queue->rt2x00dev->flags) ||
772 !test_bit(QUEUE_STARTED, &queue->flags) ||
773 !test_and_clear_bit(QUEUE_PAUSED, &queue->flags))
776 switch (queue->qid) {
782 * For TX queues, we have to enable the queue
785 ieee80211_wake_queue(queue->rt2x00dev->hw, queue->qid);
789 * For RX we need to kick the queue now in order to
792 queue->rt2x00dev->ops->lib->kick_queue(queue);
797 EXPORT_SYMBOL_GPL(rt2x00queue_unpause_queue);
799 void rt2x00queue_start_queue(struct data_queue *queue)
801 mutex_lock(&queue->status_lock);
803 if (!test_bit(DEVICE_STATE_PRESENT, &queue->rt2x00dev->flags) ||
804 test_and_set_bit(QUEUE_STARTED, &queue->flags)) {
805 mutex_unlock(&queue->status_lock);
809 set_bit(QUEUE_PAUSED, &queue->flags);
811 queue->rt2x00dev->ops->lib->start_queue(queue);
813 rt2x00queue_unpause_queue(queue);
815 mutex_unlock(&queue->status_lock);
817 EXPORT_SYMBOL_GPL(rt2x00queue_start_queue);
819 void rt2x00queue_stop_queue(struct data_queue *queue)
821 mutex_lock(&queue->status_lock);
823 if (!test_and_clear_bit(QUEUE_STARTED, &queue->flags)) {
824 mutex_unlock(&queue->status_lock);
828 rt2x00queue_pause_queue(queue);
830 queue->rt2x00dev->ops->lib->stop_queue(queue);
832 mutex_unlock(&queue->status_lock);
834 EXPORT_SYMBOL_GPL(rt2x00queue_stop_queue);
836 void rt2x00queue_flush_queue(struct data_queue *queue, bool drop)
841 (queue->qid == QID_AC_VO) ||
842 (queue->qid == QID_AC_VI) ||
843 (queue->qid == QID_AC_BE) ||
844 (queue->qid == QID_AC_BK);
846 mutex_lock(&queue->status_lock);
849 * If the queue has been started, we must stop it temporarily
850 * to prevent any new frames to be queued on the device. If
851 * we are not dropping the pending frames, the queue must
852 * only be stopped in the software and not the hardware,
853 * otherwise the queue will never become empty on its own.
855 started = test_bit(QUEUE_STARTED, &queue->flags);
860 rt2x00queue_pause_queue(queue);
863 * If we are not supposed to drop any pending
864 * frames, this means we must force a start (=kick)
865 * to the queue to make sure the hardware will
866 * start transmitting.
868 if (!drop && tx_queue)
869 queue->rt2x00dev->ops->lib->kick_queue(queue);
873 * Check if driver supports flushing, we can only guarentee
874 * full support for flushing if the driver is able
875 * to cancel all pending frames (drop = true).
877 if (drop && queue->rt2x00dev->ops->lib->flush_queue)
878 queue->rt2x00dev->ops->lib->flush_queue(queue);
881 * When we don't want to drop any frames, or when
882 * the driver doesn't fully flush the queue correcly,
883 * we must wait for the queue to become empty.
885 for (i = 0; !rt2x00queue_empty(queue) && i < 100; i++)
889 * The queue flush has failed...
891 if (unlikely(!rt2x00queue_empty(queue)))
892 WARNING(queue->rt2x00dev, "Queue %d failed to flush\n", queue->qid);
895 * Restore the queue to the previous status
898 rt2x00queue_unpause_queue(queue);
900 mutex_unlock(&queue->status_lock);
902 EXPORT_SYMBOL_GPL(rt2x00queue_flush_queue);
904 void rt2x00queue_start_queues(struct rt2x00_dev *rt2x00dev)
906 struct data_queue *queue;
909 * rt2x00queue_start_queue will call ieee80211_wake_queue
910 * for each queue after is has been properly initialized.
912 tx_queue_for_each(rt2x00dev, queue)
913 rt2x00queue_start_queue(queue);
915 rt2x00queue_start_queue(rt2x00dev->rx);
917 EXPORT_SYMBOL_GPL(rt2x00queue_start_queues);
919 void rt2x00queue_stop_queues(struct rt2x00_dev *rt2x00dev)
921 struct data_queue *queue;
924 * rt2x00queue_stop_queue will call ieee80211_stop_queue
925 * as well, but we are completely shutting doing everything
926 * now, so it is much safer to stop all TX queues at once,
927 * and use rt2x00queue_stop_queue for cleaning up.
929 ieee80211_stop_queues(rt2x00dev->hw);
931 tx_queue_for_each(rt2x00dev, queue)
932 rt2x00queue_stop_queue(queue);
934 rt2x00queue_stop_queue(rt2x00dev->rx);
936 EXPORT_SYMBOL_GPL(rt2x00queue_stop_queues);
938 void rt2x00queue_flush_queues(struct rt2x00_dev *rt2x00dev, bool drop)
940 struct data_queue *queue;
942 tx_queue_for_each(rt2x00dev, queue)
943 rt2x00queue_flush_queue(queue, drop);
945 rt2x00queue_flush_queue(rt2x00dev->rx, drop);
947 EXPORT_SYMBOL_GPL(rt2x00queue_flush_queues);
949 static void rt2x00queue_reset(struct data_queue *queue)
951 unsigned long irqflags;
954 spin_lock_irqsave(&queue->index_lock, irqflags);
959 for (i = 0; i < Q_INDEX_MAX; i++) {
961 queue->last_action[i] = jiffies;
964 spin_unlock_irqrestore(&queue->index_lock, irqflags);
967 void rt2x00queue_init_queues(struct rt2x00_dev *rt2x00dev)
969 struct data_queue *queue;
972 queue_for_each(rt2x00dev, queue) {
973 rt2x00queue_reset(queue);
975 for (i = 0; i < queue->limit; i++)
976 rt2x00dev->ops->lib->clear_entry(&queue->entries[i]);
980 static int rt2x00queue_alloc_entries(struct data_queue *queue,
981 const struct data_queue_desc *qdesc)
983 struct queue_entry *entries;
984 unsigned int entry_size;
987 rt2x00queue_reset(queue);
989 queue->limit = qdesc->entry_num;
990 queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
991 queue->data_size = qdesc->data_size;
992 queue->desc_size = qdesc->desc_size;
995 * Allocate all queue entries.
997 entry_size = sizeof(*entries) + qdesc->priv_size;
998 entries = kcalloc(queue->limit, entry_size, GFP_KERNEL);
1002 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
1003 (((char *)(__base)) + ((__limit) * (__esize)) + \
1004 ((__index) * (__psize)))
1006 for (i = 0; i < queue->limit; i++) {
1007 entries[i].flags = 0;
1008 entries[i].queue = queue;
1009 entries[i].skb = NULL;
1010 entries[i].entry_idx = i;
1011 entries[i].priv_data =
1012 QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
1013 sizeof(*entries), qdesc->priv_size);
1016 #undef QUEUE_ENTRY_PRIV_OFFSET
1018 queue->entries = entries;
1023 static void rt2x00queue_free_skbs(struct data_queue *queue)
1027 if (!queue->entries)
1030 for (i = 0; i < queue->limit; i++) {
1031 rt2x00queue_free_skb(&queue->entries[i]);
1035 static int rt2x00queue_alloc_rxskbs(struct data_queue *queue)
1038 struct sk_buff *skb;
1040 for (i = 0; i < queue->limit; i++) {
1041 skb = rt2x00queue_alloc_rxskb(&queue->entries[i]);
1044 queue->entries[i].skb = skb;
1050 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
1052 struct data_queue *queue;
1055 status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
1059 tx_queue_for_each(rt2x00dev, queue) {
1060 status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
1065 status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
1069 if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) {
1070 status = rt2x00queue_alloc_entries(rt2x00dev->atim,
1071 rt2x00dev->ops->atim);
1076 status = rt2x00queue_alloc_rxskbs(rt2x00dev->rx);
1083 ERROR(rt2x00dev, "Queue entries allocation failed.\n");
1085 rt2x00queue_uninitialize(rt2x00dev);
1090 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
1092 struct data_queue *queue;
1094 rt2x00queue_free_skbs(rt2x00dev->rx);
1096 queue_for_each(rt2x00dev, queue) {
1097 kfree(queue->entries);
1098 queue->entries = NULL;
1102 static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
1103 struct data_queue *queue, enum data_queue_qid qid)
1105 mutex_init(&queue->status_lock);
1106 spin_lock_init(&queue->index_lock);
1108 queue->rt2x00dev = rt2x00dev;
1116 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
1118 struct data_queue *queue;
1119 enum data_queue_qid qid;
1120 unsigned int req_atim =
1121 !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
1124 * We need the following queues:
1126 * TX: ops->tx_queues
1128 * Atim: 1 (if required)
1130 rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim;
1132 queue = kcalloc(rt2x00dev->data_queues, sizeof(*queue), GFP_KERNEL);
1134 ERROR(rt2x00dev, "Queue allocation failed.\n");
1139 * Initialize pointers
1141 rt2x00dev->rx = queue;
1142 rt2x00dev->tx = &queue[1];
1143 rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues];
1144 rt2x00dev->atim = req_atim ? &queue[2 + rt2x00dev->ops->tx_queues] : NULL;
1147 * Initialize queue parameters.
1149 * TX: qid = QID_AC_VO + index
1150 * TX: cw_min: 2^5 = 32.
1151 * TX: cw_max: 2^10 = 1024.
1152 * BCN: qid = QID_BEACON
1153 * ATIM: qid = QID_ATIM
1155 rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
1158 tx_queue_for_each(rt2x00dev, queue)
1159 rt2x00queue_init(rt2x00dev, queue, qid++);
1161 rt2x00queue_init(rt2x00dev, rt2x00dev->bcn, QID_BEACON);
1163 rt2x00queue_init(rt2x00dev, rt2x00dev->atim, QID_ATIM);
1168 void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
1170 kfree(rt2x00dev->rx);
1171 rt2x00dev->rx = NULL;
1172 rt2x00dev->tx = NULL;
1173 rt2x00dev->bcn = NULL;