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_align_payload(struct sk_buff *skb, unsigned int header_length)
153 unsigned int frame_length = skb->len;
154 unsigned int align = ALIGN_SIZE(skb, header_length);
159 skb_push(skb, align);
160 memmove(skb->data, skb->data + align, frame_length);
161 skb_trim(skb, frame_length);
164 void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int header_length)
166 unsigned int payload_length = skb->len - header_length;
167 unsigned int header_align = ALIGN_SIZE(skb, 0);
168 unsigned int payload_align = ALIGN_SIZE(skb, header_length);
169 unsigned int l2pad = payload_length ? L2PAD_SIZE(header_length) : 0;
172 * Adjust the header alignment if the payload needs to be moved more
175 if (payload_align > header_align)
178 /* There is nothing to do if no alignment is needed */
182 /* Reserve the amount of space needed in front of the frame */
183 skb_push(skb, header_align);
188 memmove(skb->data, skb->data + header_align, header_length);
190 /* Move the payload, if present and if required */
191 if (payload_length && payload_align)
192 memmove(skb->data + header_length + l2pad,
193 skb->data + header_length + l2pad + payload_align,
196 /* Trim the skb to the correct size */
197 skb_trim(skb, header_length + l2pad + payload_length);
200 void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length)
203 * L2 padding is only present if the skb contains more than just the
204 * IEEE 802.11 header.
206 unsigned int l2pad = (skb->len > header_length) ?
207 L2PAD_SIZE(header_length) : 0;
212 memmove(skb->data + l2pad, skb->data, header_length);
213 skb_pull(skb, l2pad);
216 static void rt2x00queue_create_tx_descriptor_seq(struct queue_entry *entry,
217 struct txentry_desc *txdesc)
219 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
220 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
221 struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
222 unsigned long irqflags;
224 if (!(tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ))
227 __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
229 if (!test_bit(DRIVER_REQUIRE_SW_SEQNO, &entry->queue->rt2x00dev->flags))
233 * The hardware is not able to insert a sequence number. Assign a
234 * software generated one here.
236 * This is wrong because beacons are not getting sequence
237 * numbers assigned properly.
239 * A secondary problem exists for drivers that cannot toggle
240 * sequence counting per-frame, since those will override the
241 * sequence counter given by mac80211.
243 spin_lock_irqsave(&intf->seqlock, irqflags);
245 if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
247 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
248 hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
250 spin_unlock_irqrestore(&intf->seqlock, irqflags);
254 static void rt2x00queue_create_tx_descriptor_plcp(struct queue_entry *entry,
255 struct txentry_desc *txdesc,
256 const struct rt2x00_rate *hwrate)
258 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
259 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
260 struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
261 unsigned int data_length;
262 unsigned int duration;
263 unsigned int residual;
265 /* Data length + CRC + Crypto overhead (IV/EIV/ICV/MIC) */
266 data_length = entry->skb->len + 4;
267 data_length += rt2x00crypto_tx_overhead(rt2x00dev, entry->skb);
271 * Length calculation depends on OFDM/CCK rate.
273 txdesc->u.plcp.signal = hwrate->plcp;
274 txdesc->u.plcp.service = 0x04;
276 if (hwrate->flags & DEV_RATE_OFDM) {
277 txdesc->u.plcp.length_high = (data_length >> 6) & 0x3f;
278 txdesc->u.plcp.length_low = data_length & 0x3f;
281 * Convert length to microseconds.
283 residual = GET_DURATION_RES(data_length, hwrate->bitrate);
284 duration = GET_DURATION(data_length, hwrate->bitrate);
290 * Check if we need to set the Length Extension
292 if (hwrate->bitrate == 110 && residual <= 30)
293 txdesc->u.plcp.service |= 0x80;
296 txdesc->u.plcp.length_high = (duration >> 8) & 0xff;
297 txdesc->u.plcp.length_low = duration & 0xff;
300 * When preamble is enabled we should set the
301 * preamble bit for the signal.
303 if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
304 txdesc->u.plcp.signal |= 0x08;
308 static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
309 struct txentry_desc *txdesc)
311 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
312 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
313 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
314 struct ieee80211_rate *rate =
315 ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
316 const struct rt2x00_rate *hwrate;
318 memset(txdesc, 0, sizeof(*txdesc));
321 * Header and frame information.
323 txdesc->length = entry->skb->len;
324 txdesc->header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
327 * Check whether this frame is to be acked.
329 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
330 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
333 * Check if this is a RTS/CTS frame
335 if (ieee80211_is_rts(hdr->frame_control) ||
336 ieee80211_is_cts(hdr->frame_control)) {
337 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
338 if (ieee80211_is_rts(hdr->frame_control))
339 __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
341 __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
342 if (tx_info->control.rts_cts_rate_idx >= 0)
344 ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
348 * Determine retry information.
350 txdesc->retry_limit = tx_info->control.rates[0].count - 1;
351 if (txdesc->retry_limit >= rt2x00dev->long_retry)
352 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
355 * Check if more fragments are pending
357 if (ieee80211_has_morefrags(hdr->frame_control)) {
358 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
359 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
363 * Check if more frames (!= fragments) are pending
365 if (tx_info->flags & IEEE80211_TX_CTL_MORE_FRAMES)
366 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
369 * Beacons and probe responses require the tsf timestamp
370 * to be inserted into the frame.
372 if (ieee80211_is_beacon(hdr->frame_control) ||
373 ieee80211_is_probe_resp(hdr->frame_control))
374 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
377 * Determine with what IFS priority this frame should be send.
378 * Set ifs to IFS_SIFS when the this is not the first fragment,
379 * or this fragment came after RTS/CTS.
381 if ((tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) &&
382 !test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) {
383 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
384 txdesc->ifs = IFS_BACKOFF;
386 txdesc->ifs = IFS_SIFS;
389 * Determine rate modulation.
391 hwrate = rt2x00_get_rate(rate->hw_value);
392 txdesc->rate_mode = RATE_MODE_CCK;
393 if (hwrate->flags & DEV_RATE_OFDM)
394 txdesc->rate_mode = RATE_MODE_OFDM;
397 * Apply TX descriptor handling by components
399 rt2x00crypto_create_tx_descriptor(entry, txdesc);
400 rt2x00queue_create_tx_descriptor_seq(entry, txdesc);
402 if (test_bit(DRIVER_REQUIRE_HT_TX_DESC, &rt2x00dev->flags))
403 rt2x00ht_create_tx_descriptor(entry, txdesc, hwrate);
405 rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, hwrate);
408 static int rt2x00queue_write_tx_data(struct queue_entry *entry,
409 struct txentry_desc *txdesc)
411 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
414 * This should not happen, we already checked the entry
415 * was ours. When the hardware disagrees there has been
416 * a queue corruption!
418 if (unlikely(rt2x00dev->ops->lib->get_entry_state &&
419 rt2x00dev->ops->lib->get_entry_state(entry))) {
421 "Corrupt queue %d, accessing entry which is not ours.\n"
422 "Please file bug report to %s.\n",
423 entry->queue->qid, DRV_PROJECT);
428 * Add the requested extra tx headroom in front of the skb.
430 skb_push(entry->skb, rt2x00dev->ops->extra_tx_headroom);
431 memset(entry->skb->data, 0, rt2x00dev->ops->extra_tx_headroom);
434 * Call the driver's write_tx_data function, if it exists.
436 if (rt2x00dev->ops->lib->write_tx_data)
437 rt2x00dev->ops->lib->write_tx_data(entry, txdesc);
440 * Map the skb to DMA.
442 if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
443 rt2x00queue_map_txskb(entry);
448 static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
449 struct txentry_desc *txdesc)
451 struct data_queue *queue = entry->queue;
453 queue->rt2x00dev->ops->lib->write_tx_desc(entry, 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(queue->rt2x00dev, DUMP_FRAME_TX, entry->skb);
462 static void rt2x00queue_kick_tx_queue(struct data_queue *queue,
463 struct txentry_desc *txdesc)
466 * Check if we need to kick the queue, there are however a few rules
467 * 1) Don't kick unless this is the last in frame in a burst.
468 * When the burst flag is set, this frame is always followed
469 * by another frame which in some way are related to eachother.
470 * This is true for fragments, RTS or CTS-to-self frames.
471 * 2) Rule 1 can be broken when the available entries
472 * in the queue are less then a certain threshold.
474 if (rt2x00queue_threshold(queue) ||
475 !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
476 queue->rt2x00dev->ops->lib->kick_queue(queue);
479 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
482 struct ieee80211_tx_info *tx_info;
483 struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
484 struct txentry_desc txdesc;
485 struct skb_frame_desc *skbdesc;
486 u8 rate_idx, rate_flags;
488 if (unlikely(rt2x00queue_full(queue)))
491 if (unlikely(test_and_set_bit(ENTRY_OWNER_DEVICE_DATA,
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(queue, &txdesc);
571 int rt2x00queue_clear_beacon(struct rt2x00_dev *rt2x00dev,
572 struct ieee80211_vif *vif)
574 struct rt2x00_intf *intf = vif_to_intf(vif);
576 if (unlikely(!intf->beacon))
579 mutex_lock(&intf->beacon_skb_mutex);
582 * Clean up the beacon skb.
584 rt2x00queue_free_skb(intf->beacon);
587 * Clear beacon (single bssid devices don't need to clear the beacon
588 * since the beacon queue will get stopped anyway).
590 if (rt2x00dev->ops->lib->clear_beacon)
591 rt2x00dev->ops->lib->clear_beacon(intf->beacon);
593 mutex_unlock(&intf->beacon_skb_mutex);
598 int rt2x00queue_update_beacon_locked(struct rt2x00_dev *rt2x00dev,
599 struct ieee80211_vif *vif)
601 struct rt2x00_intf *intf = vif_to_intf(vif);
602 struct skb_frame_desc *skbdesc;
603 struct txentry_desc txdesc;
605 if (unlikely(!intf->beacon))
609 * Clean up the beacon skb.
611 rt2x00queue_free_skb(intf->beacon);
613 intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
614 if (!intf->beacon->skb)
618 * Copy all TX descriptor information into txdesc,
619 * after that we are free to use the skb->cb array
620 * for our information.
622 rt2x00queue_create_tx_descriptor(intf->beacon, &txdesc);
625 * Fill in skb descriptor
627 skbdesc = get_skb_frame_desc(intf->beacon->skb);
628 memset(skbdesc, 0, sizeof(*skbdesc));
629 skbdesc->entry = intf->beacon;
632 * Send beacon to hardware.
634 rt2x00dev->ops->lib->write_beacon(intf->beacon, &txdesc);
640 int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
641 struct ieee80211_vif *vif)
643 struct rt2x00_intf *intf = vif_to_intf(vif);
646 mutex_lock(&intf->beacon_skb_mutex);
647 ret = rt2x00queue_update_beacon_locked(rt2x00dev, vif);
648 mutex_unlock(&intf->beacon_skb_mutex);
653 void rt2x00queue_for_each_entry(struct data_queue *queue,
654 enum queue_index start,
655 enum queue_index end,
656 void (*fn)(struct queue_entry *entry))
658 unsigned long irqflags;
659 unsigned int index_start;
660 unsigned int index_end;
663 if (unlikely(start >= Q_INDEX_MAX || end >= Q_INDEX_MAX)) {
664 ERROR(queue->rt2x00dev,
665 "Entry requested from invalid index range (%d - %d)\n",
671 * Only protect the range we are going to loop over,
672 * if during our loop a extra entry is set to pending
673 * it should not be kicked during this run, since it
674 * is part of another TX operation.
676 spin_lock_irqsave(&queue->index_lock, irqflags);
677 index_start = queue->index[start];
678 index_end = queue->index[end];
679 spin_unlock_irqrestore(&queue->index_lock, irqflags);
682 * Start from the TX done pointer, this guarentees that we will
683 * send out all frames in the correct order.
685 if (index_start < index_end) {
686 for (i = index_start; i < index_end; i++)
687 fn(&queue->entries[i]);
689 for (i = index_start; i < queue->limit; i++)
690 fn(&queue->entries[i]);
692 for (i = 0; i < index_end; i++)
693 fn(&queue->entries[i]);
696 EXPORT_SYMBOL_GPL(rt2x00queue_for_each_entry);
698 struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
699 const enum data_queue_qid queue)
701 int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
704 return rt2x00dev->rx;
706 if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx)
707 return &rt2x00dev->tx[queue];
712 if (queue == QID_BEACON)
713 return &rt2x00dev->bcn[0];
714 else if (queue == QID_ATIM && atim)
715 return &rt2x00dev->bcn[1];
719 EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
721 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
722 enum queue_index index)
724 struct queue_entry *entry;
725 unsigned long irqflags;
727 if (unlikely(index >= Q_INDEX_MAX)) {
728 ERROR(queue->rt2x00dev,
729 "Entry requested from invalid index type (%d)\n", index);
733 spin_lock_irqsave(&queue->index_lock, irqflags);
735 entry = &queue->entries[queue->index[index]];
737 spin_unlock_irqrestore(&queue->index_lock, irqflags);
741 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
743 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
745 unsigned long irqflags;
747 if (unlikely(index >= Q_INDEX_MAX)) {
748 ERROR(queue->rt2x00dev,
749 "Index change on invalid index type (%d)\n", index);
753 spin_lock_irqsave(&queue->index_lock, irqflags);
755 queue->index[index]++;
756 if (queue->index[index] >= queue->limit)
757 queue->index[index] = 0;
759 queue->last_action[index] = jiffies;
761 if (index == Q_INDEX) {
763 } else if (index == Q_INDEX_DONE) {
768 spin_unlock_irqrestore(&queue->index_lock, irqflags);
771 void rt2x00queue_pause_queue(struct data_queue *queue)
773 if (!test_bit(DEVICE_STATE_PRESENT, &queue->rt2x00dev->flags) ||
774 !test_bit(QUEUE_STARTED, &queue->flags) ||
775 test_and_set_bit(QUEUE_PAUSED, &queue->flags))
778 switch (queue->qid) {
784 * For TX queues, we have to disable the queue
787 ieee80211_stop_queue(queue->rt2x00dev->hw, queue->qid);
793 EXPORT_SYMBOL_GPL(rt2x00queue_pause_queue);
795 void rt2x00queue_unpause_queue(struct data_queue *queue)
797 if (!test_bit(DEVICE_STATE_PRESENT, &queue->rt2x00dev->flags) ||
798 !test_bit(QUEUE_STARTED, &queue->flags) ||
799 !test_and_clear_bit(QUEUE_PAUSED, &queue->flags))
802 switch (queue->qid) {
808 * For TX queues, we have to enable the queue
811 ieee80211_wake_queue(queue->rt2x00dev->hw, queue->qid);
815 * For RX we need to kick the queue now in order to
818 queue->rt2x00dev->ops->lib->kick_queue(queue);
823 EXPORT_SYMBOL_GPL(rt2x00queue_unpause_queue);
825 void rt2x00queue_start_queue(struct data_queue *queue)
827 mutex_lock(&queue->status_lock);
829 if (!test_bit(DEVICE_STATE_PRESENT, &queue->rt2x00dev->flags) ||
830 test_and_set_bit(QUEUE_STARTED, &queue->flags)) {
831 mutex_unlock(&queue->status_lock);
835 set_bit(QUEUE_PAUSED, &queue->flags);
837 queue->rt2x00dev->ops->lib->start_queue(queue);
839 rt2x00queue_unpause_queue(queue);
841 mutex_unlock(&queue->status_lock);
843 EXPORT_SYMBOL_GPL(rt2x00queue_start_queue);
845 void rt2x00queue_stop_queue(struct data_queue *queue)
847 mutex_lock(&queue->status_lock);
849 if (!test_and_clear_bit(QUEUE_STARTED, &queue->flags)) {
850 mutex_unlock(&queue->status_lock);
854 rt2x00queue_pause_queue(queue);
856 queue->rt2x00dev->ops->lib->stop_queue(queue);
858 mutex_unlock(&queue->status_lock);
860 EXPORT_SYMBOL_GPL(rt2x00queue_stop_queue);
862 void rt2x00queue_flush_queue(struct data_queue *queue, bool drop)
867 (queue->qid == QID_AC_VO) ||
868 (queue->qid == QID_AC_VI) ||
869 (queue->qid == QID_AC_BE) ||
870 (queue->qid == QID_AC_BK);
872 mutex_lock(&queue->status_lock);
875 * If the queue has been started, we must stop it temporarily
876 * to prevent any new frames to be queued on the device. If
877 * we are not dropping the pending frames, the queue must
878 * only be stopped in the software and not the hardware,
879 * otherwise the queue will never become empty on its own.
881 started = test_bit(QUEUE_STARTED, &queue->flags);
886 rt2x00queue_pause_queue(queue);
889 * If we are not supposed to drop any pending
890 * frames, this means we must force a start (=kick)
891 * to the queue to make sure the hardware will
892 * start transmitting.
894 if (!drop && tx_queue)
895 queue->rt2x00dev->ops->lib->kick_queue(queue);
899 * Check if driver supports flushing, we can only guarentee
900 * full support for flushing if the driver is able
901 * to cancel all pending frames (drop = true).
903 if (drop && queue->rt2x00dev->ops->lib->flush_queue)
904 queue->rt2x00dev->ops->lib->flush_queue(queue);
907 * When we don't want to drop any frames, or when
908 * the driver doesn't fully flush the queue correcly,
909 * we must wait for the queue to become empty.
911 for (i = 0; !rt2x00queue_empty(queue) && i < 100; i++)
915 * The queue flush has failed...
917 if (unlikely(!rt2x00queue_empty(queue)))
918 WARNING(queue->rt2x00dev, "Queue %d failed to flush\n", queue->qid);
921 * Restore the queue to the previous status
924 rt2x00queue_unpause_queue(queue);
926 mutex_unlock(&queue->status_lock);
928 EXPORT_SYMBOL_GPL(rt2x00queue_flush_queue);
930 void rt2x00queue_start_queues(struct rt2x00_dev *rt2x00dev)
932 struct data_queue *queue;
935 * rt2x00queue_start_queue will call ieee80211_wake_queue
936 * for each queue after is has been properly initialized.
938 tx_queue_for_each(rt2x00dev, queue)
939 rt2x00queue_start_queue(queue);
941 rt2x00queue_start_queue(rt2x00dev->rx);
943 EXPORT_SYMBOL_GPL(rt2x00queue_start_queues);
945 void rt2x00queue_stop_queues(struct rt2x00_dev *rt2x00dev)
947 struct data_queue *queue;
950 * rt2x00queue_stop_queue will call ieee80211_stop_queue
951 * as well, but we are completely shutting doing everything
952 * now, so it is much safer to stop all TX queues at once,
953 * and use rt2x00queue_stop_queue for cleaning up.
955 ieee80211_stop_queues(rt2x00dev->hw);
957 tx_queue_for_each(rt2x00dev, queue)
958 rt2x00queue_stop_queue(queue);
960 rt2x00queue_stop_queue(rt2x00dev->rx);
962 EXPORT_SYMBOL_GPL(rt2x00queue_stop_queues);
964 void rt2x00queue_flush_queues(struct rt2x00_dev *rt2x00dev, bool drop)
966 struct data_queue *queue;
968 tx_queue_for_each(rt2x00dev, queue)
969 rt2x00queue_flush_queue(queue, drop);
971 rt2x00queue_flush_queue(rt2x00dev->rx, drop);
973 EXPORT_SYMBOL_GPL(rt2x00queue_flush_queues);
975 static void rt2x00queue_reset(struct data_queue *queue)
977 unsigned long irqflags;
980 spin_lock_irqsave(&queue->index_lock, irqflags);
985 for (i = 0; i < Q_INDEX_MAX; i++) {
987 queue->last_action[i] = jiffies;
990 spin_unlock_irqrestore(&queue->index_lock, irqflags);
993 void rt2x00queue_init_queues(struct rt2x00_dev *rt2x00dev)
995 struct data_queue *queue;
998 queue_for_each(rt2x00dev, queue) {
999 rt2x00queue_reset(queue);
1001 for (i = 0; i < queue->limit; i++)
1002 rt2x00dev->ops->lib->clear_entry(&queue->entries[i]);
1006 static int rt2x00queue_alloc_entries(struct data_queue *queue,
1007 const struct data_queue_desc *qdesc)
1009 struct queue_entry *entries;
1010 unsigned int entry_size;
1013 rt2x00queue_reset(queue);
1015 queue->limit = qdesc->entry_num;
1016 queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
1017 queue->data_size = qdesc->data_size;
1018 queue->desc_size = qdesc->desc_size;
1021 * Allocate all queue entries.
1023 entry_size = sizeof(*entries) + qdesc->priv_size;
1024 entries = kcalloc(queue->limit, entry_size, GFP_KERNEL);
1028 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
1029 (((char *)(__base)) + ((__limit) * (__esize)) + \
1030 ((__index) * (__psize)))
1032 for (i = 0; i < queue->limit; i++) {
1033 entries[i].flags = 0;
1034 entries[i].queue = queue;
1035 entries[i].skb = NULL;
1036 entries[i].entry_idx = i;
1037 entries[i].priv_data =
1038 QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
1039 sizeof(*entries), qdesc->priv_size);
1042 #undef QUEUE_ENTRY_PRIV_OFFSET
1044 queue->entries = entries;
1049 static void rt2x00queue_free_skbs(struct data_queue *queue)
1053 if (!queue->entries)
1056 for (i = 0; i < queue->limit; i++) {
1057 rt2x00queue_free_skb(&queue->entries[i]);
1061 static int rt2x00queue_alloc_rxskbs(struct data_queue *queue)
1064 struct sk_buff *skb;
1066 for (i = 0; i < queue->limit; i++) {
1067 skb = rt2x00queue_alloc_rxskb(&queue->entries[i]);
1070 queue->entries[i].skb = skb;
1076 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
1078 struct data_queue *queue;
1081 status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
1085 tx_queue_for_each(rt2x00dev, queue) {
1086 status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
1091 status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
1095 if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) {
1096 status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1],
1097 rt2x00dev->ops->atim);
1102 status = rt2x00queue_alloc_rxskbs(rt2x00dev->rx);
1109 ERROR(rt2x00dev, "Queue entries allocation failed.\n");
1111 rt2x00queue_uninitialize(rt2x00dev);
1116 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
1118 struct data_queue *queue;
1120 rt2x00queue_free_skbs(rt2x00dev->rx);
1122 queue_for_each(rt2x00dev, queue) {
1123 kfree(queue->entries);
1124 queue->entries = NULL;
1128 static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
1129 struct data_queue *queue, enum data_queue_qid qid)
1131 mutex_init(&queue->status_lock);
1132 spin_lock_init(&queue->index_lock);
1134 queue->rt2x00dev = rt2x00dev;
1142 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
1144 struct data_queue *queue;
1145 enum data_queue_qid qid;
1146 unsigned int req_atim =
1147 !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
1150 * We need the following queues:
1152 * TX: ops->tx_queues
1154 * Atim: 1 (if required)
1156 rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim;
1158 queue = kcalloc(rt2x00dev->data_queues, sizeof(*queue), GFP_KERNEL);
1160 ERROR(rt2x00dev, "Queue allocation failed.\n");
1165 * Initialize pointers
1167 rt2x00dev->rx = queue;
1168 rt2x00dev->tx = &queue[1];
1169 rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues];
1172 * Initialize queue parameters.
1174 * TX: qid = QID_AC_VO + index
1175 * TX: cw_min: 2^5 = 32.
1176 * TX: cw_max: 2^10 = 1024.
1177 * BCN: qid = QID_BEACON
1178 * ATIM: qid = QID_ATIM
1180 rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
1183 tx_queue_for_each(rt2x00dev, queue)
1184 rt2x00queue_init(rt2x00dev, queue, qid++);
1186 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[0], QID_BEACON);
1188 rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[1], QID_ATIM);
1193 void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
1195 kfree(rt2x00dev->rx);
1196 rt2x00dev->rx = NULL;
1197 rt2x00dev->tx = NULL;
1198 rt2x00dev->bcn = NULL;