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(CAPABILITY_HW_CRYPTO, &rt2x00dev->cap_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(REQUIRE_DMA, &rt2x00dev->cap_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 rt2x00_dev *rt2x00dev,
205 struct txentry_desc *txdesc)
207 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
208 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
209 struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
211 if (!(tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ))
214 __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
216 if (!test_bit(REQUIRE_SW_SEQNO, &rt2x00dev->cap_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(&intf->seqlock);
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(&intf->seqlock);
241 static void rt2x00queue_create_tx_descriptor_plcp(struct rt2x00_dev *rt2x00dev,
243 struct txentry_desc *txdesc,
244 const struct rt2x00_rate *hwrate)
246 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(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 = skb->len + 4;
264 data_length += rt2x00crypto_tx_overhead(rt2x00dev, 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_ht(struct rt2x00_dev *rt2x00dev,
307 struct txentry_desc *txdesc,
308 const struct rt2x00_rate *hwrate)
310 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
311 struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
312 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
313 struct rt2x00_sta *sta_priv = NULL;
315 if (tx_info->control.sta) {
316 txdesc->u.ht.mpdu_density =
317 tx_info->control.sta->ht_cap.ampdu_density;
319 sta_priv = sta_to_rt2x00_sta(tx_info->control.sta);
320 txdesc->u.ht.wcid = sta_priv->wcid;
323 txdesc->u.ht.ba_size = 7; /* FIXME: What value is needed? */
326 * Only one STBC stream is supported for now.
328 if (tx_info->flags & IEEE80211_TX_CTL_STBC)
329 txdesc->u.ht.stbc = 1;
332 * If IEEE80211_TX_RC_MCS is set txrate->idx just contains the
333 * mcs rate to be used
335 if (txrate->flags & IEEE80211_TX_RC_MCS) {
336 txdesc->u.ht.mcs = txrate->idx;
339 * MIMO PS should be set to 1 for STA's using dynamic SM PS
340 * when using more then one tx stream (>MCS7).
342 if (tx_info->control.sta && txdesc->u.ht.mcs > 7 &&
343 ((tx_info->control.sta->ht_cap.cap &
344 IEEE80211_HT_CAP_SM_PS) >>
345 IEEE80211_HT_CAP_SM_PS_SHIFT) ==
346 WLAN_HT_CAP_SM_PS_DYNAMIC)
347 __set_bit(ENTRY_TXD_HT_MIMO_PS, &txdesc->flags);
349 txdesc->u.ht.mcs = rt2x00_get_rate_mcs(hwrate->mcs);
350 if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
351 txdesc->u.ht.mcs |= 0x08;
355 * This frame is eligible for an AMPDU, however, don't aggregate
356 * frames that are intended to probe a specific tx rate.
358 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU &&
359 !(tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE))
360 __set_bit(ENTRY_TXD_HT_AMPDU, &txdesc->flags);
363 * Set 40Mhz mode if necessary (for legacy rates this will
364 * duplicate the frame to both channels).
366 if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH ||
367 txrate->flags & IEEE80211_TX_RC_DUP_DATA)
368 __set_bit(ENTRY_TXD_HT_BW_40, &txdesc->flags);
369 if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)
370 __set_bit(ENTRY_TXD_HT_SHORT_GI, &txdesc->flags);
373 * Determine IFS values
374 * - Use TXOP_BACKOFF for management frames except beacons
375 * - Use TXOP_SIFS for fragment bursts
376 * - Use TXOP_HTTXOP for everything else
378 * Note: rt2800 devices won't use CTS protection (if used)
379 * for frames not transmitted with TXOP_HTTXOP
381 if (ieee80211_is_mgmt(hdr->frame_control) &&
382 !ieee80211_is_beacon(hdr->frame_control))
383 txdesc->u.ht.txop = TXOP_BACKOFF;
384 else if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT))
385 txdesc->u.ht.txop = TXOP_SIFS;
387 txdesc->u.ht.txop = TXOP_HTTXOP;
390 static void rt2x00queue_create_tx_descriptor(struct rt2x00_dev *rt2x00dev,
392 struct txentry_desc *txdesc)
394 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
395 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
396 struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
397 struct ieee80211_rate *rate;
398 const struct rt2x00_rate *hwrate = NULL;
400 memset(txdesc, 0, sizeof(*txdesc));
403 * Header and frame information.
405 txdesc->length = skb->len;
406 txdesc->header_length = ieee80211_get_hdrlen_from_skb(skb);
409 * Check whether this frame is to be acked.
411 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
412 __set_bit(ENTRY_TXD_ACK, &txdesc->flags);
415 * Check if this is a RTS/CTS frame
417 if (ieee80211_is_rts(hdr->frame_control) ||
418 ieee80211_is_cts(hdr->frame_control)) {
419 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
420 if (ieee80211_is_rts(hdr->frame_control))
421 __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags);
423 __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags);
424 if (tx_info->control.rts_cts_rate_idx >= 0)
426 ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info);
430 * Determine retry information.
432 txdesc->retry_limit = tx_info->control.rates[0].count - 1;
433 if (txdesc->retry_limit >= rt2x00dev->long_retry)
434 __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
437 * Check if more fragments are pending
439 if (ieee80211_has_morefrags(hdr->frame_control)) {
440 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
441 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
445 * Check if more frames (!= fragments) are pending
447 if (tx_info->flags & IEEE80211_TX_CTL_MORE_FRAMES)
448 __set_bit(ENTRY_TXD_BURST, &txdesc->flags);
451 * Beacons and probe responses require the tsf timestamp
452 * to be inserted into the frame.
454 if (ieee80211_is_beacon(hdr->frame_control) ||
455 ieee80211_is_probe_resp(hdr->frame_control))
456 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags);
458 if ((tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) &&
459 !test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags))
460 __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
463 * Determine rate modulation.
465 if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
466 txdesc->rate_mode = RATE_MODE_HT_GREENFIELD;
467 else if (txrate->flags & IEEE80211_TX_RC_MCS)
468 txdesc->rate_mode = RATE_MODE_HT_MIX;
470 rate = ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
471 hwrate = rt2x00_get_rate(rate->hw_value);
472 if (hwrate->flags & DEV_RATE_OFDM)
473 txdesc->rate_mode = RATE_MODE_OFDM;
475 txdesc->rate_mode = RATE_MODE_CCK;
479 * Apply TX descriptor handling by components
481 rt2x00crypto_create_tx_descriptor(rt2x00dev, skb, txdesc);
482 rt2x00queue_create_tx_descriptor_seq(rt2x00dev, skb, txdesc);
484 if (test_bit(REQUIRE_HT_TX_DESC, &rt2x00dev->cap_flags))
485 rt2x00queue_create_tx_descriptor_ht(rt2x00dev, skb, txdesc,
488 rt2x00queue_create_tx_descriptor_plcp(rt2x00dev, skb, txdesc,
492 static int rt2x00queue_write_tx_data(struct queue_entry *entry,
493 struct txentry_desc *txdesc)
495 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
498 * This should not happen, we already checked the entry
499 * was ours. When the hardware disagrees there has been
500 * a queue corruption!
502 if (unlikely(rt2x00dev->ops->lib->get_entry_state &&
503 rt2x00dev->ops->lib->get_entry_state(entry))) {
505 "Corrupt queue %d, accessing entry which is not ours.\n"
506 "Please file bug report to %s.\n",
507 entry->queue->qid, DRV_PROJECT);
512 * Add the requested extra tx headroom in front of the skb.
514 skb_push(entry->skb, rt2x00dev->ops->extra_tx_headroom);
515 memset(entry->skb->data, 0, rt2x00dev->ops->extra_tx_headroom);
518 * Call the driver's write_tx_data function, if it exists.
520 if (rt2x00dev->ops->lib->write_tx_data)
521 rt2x00dev->ops->lib->write_tx_data(entry, txdesc);
524 * Map the skb to DMA.
526 if (test_bit(REQUIRE_DMA, &rt2x00dev->cap_flags))
527 rt2x00queue_map_txskb(entry);
532 static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
533 struct txentry_desc *txdesc)
535 struct data_queue *queue = entry->queue;
537 queue->rt2x00dev->ops->lib->write_tx_desc(entry, txdesc);
540 * All processing on the frame has been completed, this means
541 * it is now ready to be dumped to userspace through debugfs.
543 rt2x00debug_dump_frame(queue->rt2x00dev, DUMP_FRAME_TX, entry->skb);
546 static void rt2x00queue_kick_tx_queue(struct data_queue *queue,
547 struct txentry_desc *txdesc)
550 * Check if we need to kick the queue, there are however a few rules
551 * 1) Don't kick unless this is the last in frame in a burst.
552 * When the burst flag is set, this frame is always followed
553 * by another frame which in some way are related to eachother.
554 * This is true for fragments, RTS or CTS-to-self frames.
555 * 2) Rule 1 can be broken when the available entries
556 * in the queue are less then a certain threshold.
558 if (rt2x00queue_threshold(queue) ||
559 !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
560 queue->rt2x00dev->ops->lib->kick_queue(queue);
563 int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
566 struct ieee80211_tx_info *tx_info;
567 struct queue_entry *entry;
568 struct txentry_desc txdesc;
569 struct skb_frame_desc *skbdesc;
570 u8 rate_idx, rate_flags;
574 * Copy all TX descriptor information into txdesc,
575 * after that we are free to use the skb->cb array
576 * for our information.
578 rt2x00queue_create_tx_descriptor(queue->rt2x00dev, skb, &txdesc);
581 * All information is retrieved from the skb->cb array,
582 * now we should claim ownership of the driver part of that
583 * array, preserving the bitrate index and flags.
585 tx_info = IEEE80211_SKB_CB(skb);
586 rate_idx = tx_info->control.rates[0].idx;
587 rate_flags = tx_info->control.rates[0].flags;
588 skbdesc = get_skb_frame_desc(skb);
589 memset(skbdesc, 0, sizeof(*skbdesc));
590 skbdesc->tx_rate_idx = rate_idx;
591 skbdesc->tx_rate_flags = rate_flags;
594 skbdesc->flags |= SKBDESC_NOT_MAC80211;
597 * When hardware encryption is supported, and this frame
598 * is to be encrypted, we should strip the IV/EIV data from
599 * the frame so we can provide it to the driver separately.
601 if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
602 !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) {
603 if (test_bit(REQUIRE_COPY_IV, &queue->rt2x00dev->cap_flags))
604 rt2x00crypto_tx_copy_iv(skb, &txdesc);
606 rt2x00crypto_tx_remove_iv(skb, &txdesc);
610 * When DMA allocation is required we should guarantee to the
611 * driver that the DMA is aligned to a 4-byte boundary.
612 * However some drivers require L2 padding to pad the payload
613 * rather then the header. This could be a requirement for
614 * PCI and USB devices, while header alignment only is valid
617 if (test_bit(REQUIRE_L2PAD, &queue->rt2x00dev->cap_flags))
618 rt2x00queue_insert_l2pad(skb, txdesc.header_length);
619 else if (test_bit(REQUIRE_DMA, &queue->rt2x00dev->cap_flags))
620 rt2x00queue_align_frame(skb);
622 spin_lock(&queue->tx_lock);
624 if (unlikely(rt2x00queue_full(queue))) {
625 ERROR(queue->rt2x00dev,
626 "Dropping frame due to full tx queue %d.\n", queue->qid);
631 entry = rt2x00queue_get_entry(queue, Q_INDEX);
633 if (unlikely(test_and_set_bit(ENTRY_OWNER_DEVICE_DATA,
635 ERROR(queue->rt2x00dev,
636 "Arrived at non-free entry in the non-full queue %d.\n"
637 "Please file bug report to %s.\n",
638 queue->qid, DRV_PROJECT);
643 skbdesc->entry = entry;
647 * It could be possible that the queue was corrupted and this
648 * call failed. Since we always return NETDEV_TX_OK to mac80211,
649 * this frame will simply be dropped.
651 if (unlikely(rt2x00queue_write_tx_data(entry, &txdesc))) {
652 clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
658 set_bit(ENTRY_DATA_PENDING, &entry->flags);
660 rt2x00queue_index_inc(entry, Q_INDEX);
661 rt2x00queue_write_tx_descriptor(entry, &txdesc);
662 rt2x00queue_kick_tx_queue(queue, &txdesc);
665 spin_unlock(&queue->tx_lock);
669 int rt2x00queue_clear_beacon(struct rt2x00_dev *rt2x00dev,
670 struct ieee80211_vif *vif)
672 struct rt2x00_intf *intf = vif_to_intf(vif);
674 if (unlikely(!intf->beacon))
677 mutex_lock(&intf->beacon_skb_mutex);
680 * Clean up the beacon skb.
682 rt2x00queue_free_skb(intf->beacon);
685 * Clear beacon (single bssid devices don't need to clear the beacon
686 * since the beacon queue will get stopped anyway).
688 if (rt2x00dev->ops->lib->clear_beacon)
689 rt2x00dev->ops->lib->clear_beacon(intf->beacon);
691 mutex_unlock(&intf->beacon_skb_mutex);
696 int rt2x00queue_update_beacon_locked(struct rt2x00_dev *rt2x00dev,
697 struct ieee80211_vif *vif)
699 struct rt2x00_intf *intf = vif_to_intf(vif);
700 struct skb_frame_desc *skbdesc;
701 struct txentry_desc txdesc;
703 if (unlikely(!intf->beacon))
707 * Clean up the beacon skb.
709 rt2x00queue_free_skb(intf->beacon);
711 intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
712 if (!intf->beacon->skb)
716 * Copy all TX descriptor information into txdesc,
717 * after that we are free to use the skb->cb array
718 * for our information.
720 rt2x00queue_create_tx_descriptor(rt2x00dev, intf->beacon->skb, &txdesc);
723 * Fill in skb descriptor
725 skbdesc = get_skb_frame_desc(intf->beacon->skb);
726 memset(skbdesc, 0, sizeof(*skbdesc));
727 skbdesc->entry = intf->beacon;
730 * Send beacon to hardware.
732 rt2x00dev->ops->lib->write_beacon(intf->beacon, &txdesc);
738 int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
739 struct ieee80211_vif *vif)
741 struct rt2x00_intf *intf = vif_to_intf(vif);
744 mutex_lock(&intf->beacon_skb_mutex);
745 ret = rt2x00queue_update_beacon_locked(rt2x00dev, vif);
746 mutex_unlock(&intf->beacon_skb_mutex);
751 bool rt2x00queue_for_each_entry(struct data_queue *queue,
752 enum queue_index start,
753 enum queue_index end,
755 bool (*fn)(struct queue_entry *entry,
758 unsigned long irqflags;
759 unsigned int index_start;
760 unsigned int index_end;
763 if (unlikely(start >= Q_INDEX_MAX || end >= Q_INDEX_MAX)) {
764 ERROR(queue->rt2x00dev,
765 "Entry requested from invalid index range (%d - %d)\n",
771 * Only protect the range we are going to loop over,
772 * if during our loop a extra entry is set to pending
773 * it should not be kicked during this run, since it
774 * is part of another TX operation.
776 spin_lock_irqsave(&queue->index_lock, irqflags);
777 index_start = queue->index[start];
778 index_end = queue->index[end];
779 spin_unlock_irqrestore(&queue->index_lock, irqflags);
782 * Start from the TX done pointer, this guarantees that we will
783 * send out all frames in the correct order.
785 if (index_start < index_end) {
786 for (i = index_start; i < index_end; i++) {
787 if (fn(&queue->entries[i], data))
791 for (i = index_start; i < queue->limit; i++) {
792 if (fn(&queue->entries[i], data))
796 for (i = 0; i < index_end; i++) {
797 if (fn(&queue->entries[i], data))
804 EXPORT_SYMBOL_GPL(rt2x00queue_for_each_entry);
806 struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
807 enum queue_index index)
809 struct queue_entry *entry;
810 unsigned long irqflags;
812 if (unlikely(index >= Q_INDEX_MAX)) {
813 ERROR(queue->rt2x00dev,
814 "Entry requested from invalid index type (%d)\n", index);
818 spin_lock_irqsave(&queue->index_lock, irqflags);
820 entry = &queue->entries[queue->index[index]];
822 spin_unlock_irqrestore(&queue->index_lock, irqflags);
826 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
828 void rt2x00queue_index_inc(struct queue_entry *entry, enum queue_index index)
830 struct data_queue *queue = entry->queue;
831 unsigned long irqflags;
833 if (unlikely(index >= Q_INDEX_MAX)) {
834 ERROR(queue->rt2x00dev,
835 "Index change on invalid index type (%d)\n", index);
839 spin_lock_irqsave(&queue->index_lock, irqflags);
841 queue->index[index]++;
842 if (queue->index[index] >= queue->limit)
843 queue->index[index] = 0;
845 entry->last_action = jiffies;
847 if (index == Q_INDEX) {
849 } else if (index == Q_INDEX_DONE) {
854 spin_unlock_irqrestore(&queue->index_lock, irqflags);
857 void rt2x00queue_pause_queue(struct data_queue *queue)
859 if (!test_bit(DEVICE_STATE_PRESENT, &queue->rt2x00dev->flags) ||
860 !test_bit(QUEUE_STARTED, &queue->flags) ||
861 test_and_set_bit(QUEUE_PAUSED, &queue->flags))
864 switch (queue->qid) {
870 * For TX queues, we have to disable the queue
873 ieee80211_stop_queue(queue->rt2x00dev->hw, queue->qid);
879 EXPORT_SYMBOL_GPL(rt2x00queue_pause_queue);
881 void rt2x00queue_unpause_queue(struct data_queue *queue)
883 if (!test_bit(DEVICE_STATE_PRESENT, &queue->rt2x00dev->flags) ||
884 !test_bit(QUEUE_STARTED, &queue->flags) ||
885 !test_and_clear_bit(QUEUE_PAUSED, &queue->flags))
888 switch (queue->qid) {
894 * For TX queues, we have to enable the queue
897 ieee80211_wake_queue(queue->rt2x00dev->hw, queue->qid);
901 * For RX we need to kick the queue now in order to
904 queue->rt2x00dev->ops->lib->kick_queue(queue);
909 EXPORT_SYMBOL_GPL(rt2x00queue_unpause_queue);
911 void rt2x00queue_start_queue(struct data_queue *queue)
913 mutex_lock(&queue->status_lock);
915 if (!test_bit(DEVICE_STATE_PRESENT, &queue->rt2x00dev->flags) ||
916 test_and_set_bit(QUEUE_STARTED, &queue->flags)) {
917 mutex_unlock(&queue->status_lock);
921 set_bit(QUEUE_PAUSED, &queue->flags);
923 queue->rt2x00dev->ops->lib->start_queue(queue);
925 rt2x00queue_unpause_queue(queue);
927 mutex_unlock(&queue->status_lock);
929 EXPORT_SYMBOL_GPL(rt2x00queue_start_queue);
931 void rt2x00queue_stop_queue(struct data_queue *queue)
933 mutex_lock(&queue->status_lock);
935 if (!test_and_clear_bit(QUEUE_STARTED, &queue->flags)) {
936 mutex_unlock(&queue->status_lock);
940 rt2x00queue_pause_queue(queue);
942 queue->rt2x00dev->ops->lib->stop_queue(queue);
944 mutex_unlock(&queue->status_lock);
946 EXPORT_SYMBOL_GPL(rt2x00queue_stop_queue);
948 void rt2x00queue_flush_queue(struct data_queue *queue, bool drop)
952 (queue->qid == QID_AC_VO) ||
953 (queue->qid == QID_AC_VI) ||
954 (queue->qid == QID_AC_BE) ||
955 (queue->qid == QID_AC_BK);
957 mutex_lock(&queue->status_lock);
960 * If the queue has been started, we must stop it temporarily
961 * to prevent any new frames to be queued on the device. If
962 * we are not dropping the pending frames, the queue must
963 * only be stopped in the software and not the hardware,
964 * otherwise the queue will never become empty on its own.
966 started = test_bit(QUEUE_STARTED, &queue->flags);
971 rt2x00queue_pause_queue(queue);
974 * If we are not supposed to drop any pending
975 * frames, this means we must force a start (=kick)
976 * to the queue to make sure the hardware will
977 * start transmitting.
979 if (!drop && tx_queue)
980 queue->rt2x00dev->ops->lib->kick_queue(queue);
984 * Check if driver supports flushing, if that is the case we can
985 * defer the flushing to the driver. Otherwise we must use the
986 * alternative which just waits for the queue to become empty.
988 if (likely(queue->rt2x00dev->ops->lib->flush_queue))
989 queue->rt2x00dev->ops->lib->flush_queue(queue, drop);
992 * The queue flush has failed...
994 if (unlikely(!rt2x00queue_empty(queue)))
995 WARNING(queue->rt2x00dev, "Queue %d failed to flush\n", queue->qid);
998 * Restore the queue to the previous status
1001 rt2x00queue_unpause_queue(queue);
1003 mutex_unlock(&queue->status_lock);
1005 EXPORT_SYMBOL_GPL(rt2x00queue_flush_queue);
1007 void rt2x00queue_start_queues(struct rt2x00_dev *rt2x00dev)
1009 struct data_queue *queue;
1012 * rt2x00queue_start_queue will call ieee80211_wake_queue
1013 * for each queue after is has been properly initialized.
1015 tx_queue_for_each(rt2x00dev, queue)
1016 rt2x00queue_start_queue(queue);
1018 rt2x00queue_start_queue(rt2x00dev->rx);
1020 EXPORT_SYMBOL_GPL(rt2x00queue_start_queues);
1022 void rt2x00queue_stop_queues(struct rt2x00_dev *rt2x00dev)
1024 struct data_queue *queue;
1027 * rt2x00queue_stop_queue will call ieee80211_stop_queue
1028 * as well, but we are completely shutting doing everything
1029 * now, so it is much safer to stop all TX queues at once,
1030 * and use rt2x00queue_stop_queue for cleaning up.
1032 ieee80211_stop_queues(rt2x00dev->hw);
1034 tx_queue_for_each(rt2x00dev, queue)
1035 rt2x00queue_stop_queue(queue);
1037 rt2x00queue_stop_queue(rt2x00dev->rx);
1039 EXPORT_SYMBOL_GPL(rt2x00queue_stop_queues);
1041 void rt2x00queue_flush_queues(struct rt2x00_dev *rt2x00dev, bool drop)
1043 struct data_queue *queue;
1045 tx_queue_for_each(rt2x00dev, queue)
1046 rt2x00queue_flush_queue(queue, drop);
1048 rt2x00queue_flush_queue(rt2x00dev->rx, drop);
1050 EXPORT_SYMBOL_GPL(rt2x00queue_flush_queues);
1052 static void rt2x00queue_reset(struct data_queue *queue)
1054 unsigned long irqflags;
1057 spin_lock_irqsave(&queue->index_lock, irqflags);
1062 for (i = 0; i < Q_INDEX_MAX; i++)
1063 queue->index[i] = 0;
1065 spin_unlock_irqrestore(&queue->index_lock, irqflags);
1068 void rt2x00queue_init_queues(struct rt2x00_dev *rt2x00dev)
1070 struct data_queue *queue;
1073 queue_for_each(rt2x00dev, queue) {
1074 rt2x00queue_reset(queue);
1076 for (i = 0; i < queue->limit; i++)
1077 rt2x00dev->ops->lib->clear_entry(&queue->entries[i]);
1081 static int rt2x00queue_alloc_entries(struct data_queue *queue,
1082 const struct data_queue_desc *qdesc)
1084 struct queue_entry *entries;
1085 unsigned int entry_size;
1088 rt2x00queue_reset(queue);
1090 queue->limit = qdesc->entry_num;
1091 queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
1092 queue->data_size = qdesc->data_size;
1093 queue->desc_size = qdesc->desc_size;
1096 * Allocate all queue entries.
1098 entry_size = sizeof(*entries) + qdesc->priv_size;
1099 entries = kcalloc(queue->limit, entry_size, GFP_KERNEL);
1103 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
1104 (((char *)(__base)) + ((__limit) * (__esize)) + \
1105 ((__index) * (__psize)))
1107 for (i = 0; i < queue->limit; i++) {
1108 entries[i].flags = 0;
1109 entries[i].queue = queue;
1110 entries[i].skb = NULL;
1111 entries[i].entry_idx = i;
1112 entries[i].priv_data =
1113 QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
1114 sizeof(*entries), qdesc->priv_size);
1117 #undef QUEUE_ENTRY_PRIV_OFFSET
1119 queue->entries = entries;
1124 static void rt2x00queue_free_skbs(struct data_queue *queue)
1128 if (!queue->entries)
1131 for (i = 0; i < queue->limit; i++) {
1132 rt2x00queue_free_skb(&queue->entries[i]);
1136 static int rt2x00queue_alloc_rxskbs(struct data_queue *queue)
1139 struct sk_buff *skb;
1141 for (i = 0; i < queue->limit; i++) {
1142 skb = rt2x00queue_alloc_rxskb(&queue->entries[i]);
1145 queue->entries[i].skb = skb;
1151 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
1153 struct data_queue *queue;
1156 status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
1160 tx_queue_for_each(rt2x00dev, queue) {
1161 status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
1166 status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
1170 if (test_bit(REQUIRE_ATIM_QUEUE, &rt2x00dev->cap_flags)) {
1171 status = rt2x00queue_alloc_entries(rt2x00dev->atim,
1172 rt2x00dev->ops->atim);
1177 status = rt2x00queue_alloc_rxskbs(rt2x00dev->rx);
1184 ERROR(rt2x00dev, "Queue entries allocation failed.\n");
1186 rt2x00queue_uninitialize(rt2x00dev);
1191 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
1193 struct data_queue *queue;
1195 rt2x00queue_free_skbs(rt2x00dev->rx);
1197 queue_for_each(rt2x00dev, queue) {
1198 kfree(queue->entries);
1199 queue->entries = NULL;
1203 static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
1204 struct data_queue *queue, enum data_queue_qid qid)
1206 mutex_init(&queue->status_lock);
1207 spin_lock_init(&queue->tx_lock);
1208 spin_lock_init(&queue->index_lock);
1210 queue->rt2x00dev = rt2x00dev;
1218 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
1220 struct data_queue *queue;
1221 enum data_queue_qid qid;
1222 unsigned int req_atim =
1223 !!test_bit(REQUIRE_ATIM_QUEUE, &rt2x00dev->cap_flags);
1226 * We need the following queues:
1228 * TX: ops->tx_queues
1230 * Atim: 1 (if required)
1232 rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_queues + req_atim;
1234 queue = kcalloc(rt2x00dev->data_queues, sizeof(*queue), GFP_KERNEL);
1236 ERROR(rt2x00dev, "Queue allocation failed.\n");
1241 * Initialize pointers
1243 rt2x00dev->rx = queue;
1244 rt2x00dev->tx = &queue[1];
1245 rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues];
1246 rt2x00dev->atim = req_atim ? &queue[2 + rt2x00dev->ops->tx_queues] : NULL;
1249 * Initialize queue parameters.
1251 * TX: qid = QID_AC_VO + index
1252 * TX: cw_min: 2^5 = 32.
1253 * TX: cw_max: 2^10 = 1024.
1254 * BCN: qid = QID_BEACON
1255 * ATIM: qid = QID_ATIM
1257 rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
1260 tx_queue_for_each(rt2x00dev, queue)
1261 rt2x00queue_init(rt2x00dev, queue, qid++);
1263 rt2x00queue_init(rt2x00dev, rt2x00dev->bcn, QID_BEACON);
1265 rt2x00queue_init(rt2x00dev, rt2x00dev->atim, QID_ATIM);
1270 void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
1272 kfree(rt2x00dev->rx);
1273 rt2x00dev->rx = NULL;
1274 rt2x00dev->tx = NULL;
1275 rt2x00dev->bcn = NULL;