2 Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
3 Copyright (C) 2004 - 2009 Gertjan van Wingerde <gwingerde@gmail.com>
4 <http://rt2x00.serialmonkey.com>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the
18 Free Software Foundation, Inc.,
19 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 Abstract: rt2x00 queue specific routines.
27 #include <linux/slab.h>
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/dma-mapping.h>
33 #include "rt2x00lib.h"
35 struct sk_buff
*rt2x00queue_alloc_rxskb(struct rt2x00_dev
*rt2x00dev
,
36 struct queue_entry
*entry
)
39 struct skb_frame_desc
*skbdesc
;
40 unsigned int frame_size
;
41 unsigned int head_size
= 0;
42 unsigned int tail_size
= 0;
45 * The frame size includes descriptor size, because the
46 * hardware directly receive the frame into the skbuffer.
48 frame_size
= entry
->queue
->data_size
+ entry
->queue
->desc_size
;
51 * The payload should be aligned to a 4-byte boundary,
52 * this means we need at least 3 bytes for moving the frame
53 * into the correct offset.
58 * For IV/EIV/ICV assembly we must make sure there is
59 * at least 8 bytes bytes available in headroom for IV/EIV
60 * and 8 bytes for ICV data as tailroon.
62 if (test_bit(CONFIG_SUPPORT_HW_CRYPTO
, &rt2x00dev
->flags
)) {
70 skb
= dev_alloc_skb(frame_size
+ head_size
+ tail_size
);
75 * Make sure we not have a frame with the requested bytes
76 * available in the head and tail.
78 skb_reserve(skb
, head_size
);
79 skb_put(skb
, frame_size
);
84 skbdesc
= get_skb_frame_desc(skb
);
85 memset(skbdesc
, 0, sizeof(*skbdesc
));
86 skbdesc
->entry
= entry
;
88 if (test_bit(DRIVER_REQUIRE_DMA
, &rt2x00dev
->flags
)) {
89 skbdesc
->skb_dma
= dma_map_single(rt2x00dev
->dev
,
93 skbdesc
->flags
|= SKBDESC_DMA_MAPPED_RX
;
99 void rt2x00queue_map_txskb(struct rt2x00_dev
*rt2x00dev
, struct sk_buff
*skb
)
101 struct skb_frame_desc
*skbdesc
= get_skb_frame_desc(skb
);
104 dma_map_single(rt2x00dev
->dev
, skb
->data
, skb
->len
, DMA_TO_DEVICE
);
105 skbdesc
->flags
|= SKBDESC_DMA_MAPPED_TX
;
107 EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb
);
109 void rt2x00queue_unmap_skb(struct rt2x00_dev
*rt2x00dev
, struct sk_buff
*skb
)
111 struct skb_frame_desc
*skbdesc
= get_skb_frame_desc(skb
);
113 if (skbdesc
->flags
& SKBDESC_DMA_MAPPED_RX
) {
114 dma_unmap_single(rt2x00dev
->dev
, skbdesc
->skb_dma
, skb
->len
,
116 skbdesc
->flags
&= ~SKBDESC_DMA_MAPPED_RX
;
119 if (skbdesc
->flags
& SKBDESC_DMA_MAPPED_TX
) {
120 dma_unmap_single(rt2x00dev
->dev
, skbdesc
->skb_dma
, skb
->len
,
122 skbdesc
->flags
&= ~SKBDESC_DMA_MAPPED_TX
;
125 EXPORT_SYMBOL_GPL(rt2x00queue_unmap_skb
);
127 void rt2x00queue_free_skb(struct rt2x00_dev
*rt2x00dev
, struct sk_buff
*skb
)
132 rt2x00queue_unmap_skb(rt2x00dev
, skb
);
133 dev_kfree_skb_any(skb
);
136 void rt2x00queue_align_frame(struct sk_buff
*skb
)
138 unsigned int frame_length
= skb
->len
;
139 unsigned int align
= ALIGN_SIZE(skb
, 0);
144 skb_push(skb
, align
);
145 memmove(skb
->data
, skb
->data
+ align
, frame_length
);
146 skb_trim(skb
, frame_length
);
149 void rt2x00queue_align_payload(struct sk_buff
*skb
, unsigned int header_length
)
151 unsigned int frame_length
= skb
->len
;
152 unsigned int align
= ALIGN_SIZE(skb
, header_length
);
157 skb_push(skb
, align
);
158 memmove(skb
->data
, skb
->data
+ align
, frame_length
);
159 skb_trim(skb
, frame_length
);
162 void rt2x00queue_insert_l2pad(struct sk_buff
*skb
, unsigned int header_length
)
164 unsigned int payload_length
= skb
->len
- header_length
;
165 unsigned int header_align
= ALIGN_SIZE(skb
, 0);
166 unsigned int payload_align
= ALIGN_SIZE(skb
, header_length
);
167 unsigned int l2pad
= payload_length
? L2PAD_SIZE(header_length
) : 0;
170 * Adjust the header alignment if the payload needs to be moved more
173 if (payload_align
> header_align
)
176 /* There is nothing to do if no alignment is needed */
180 /* Reserve the amount of space needed in front of the frame */
181 skb_push(skb
, header_align
);
186 memmove(skb
->data
, skb
->data
+ header_align
, header_length
);
188 /* Move the payload, if present and if required */
189 if (payload_length
&& payload_align
)
190 memmove(skb
->data
+ header_length
+ l2pad
,
191 skb
->data
+ header_length
+ l2pad
+ payload_align
,
194 /* Trim the skb to the correct size */
195 skb_trim(skb
, header_length
+ l2pad
+ payload_length
);
198 void rt2x00queue_remove_l2pad(struct sk_buff
*skb
, unsigned int header_length
)
200 unsigned int l2pad
= L2PAD_SIZE(header_length
);
205 memmove(skb
->data
+ l2pad
, skb
->data
, header_length
);
206 skb_pull(skb
, l2pad
);
209 static void rt2x00queue_create_tx_descriptor_seq(struct queue_entry
*entry
,
210 struct txentry_desc
*txdesc
)
212 struct ieee80211_tx_info
*tx_info
= IEEE80211_SKB_CB(entry
->skb
);
213 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)entry
->skb
->data
;
214 struct rt2x00_intf
*intf
= vif_to_intf(tx_info
->control
.vif
);
215 unsigned long irqflags
;
217 if (!(tx_info
->flags
& IEEE80211_TX_CTL_ASSIGN_SEQ
) ||
218 unlikely(!tx_info
->control
.vif
))
222 * Hardware should insert sequence counter.
223 * FIXME: We insert a software sequence counter first for
224 * hardware that doesn't support hardware sequence counting.
226 * This is wrong because beacons are not getting sequence
227 * numbers assigned properly.
229 * A secondary problem exists for drivers that cannot toggle
230 * sequence counting per-frame, since those will override the
231 * sequence counter given by mac80211.
233 spin_lock_irqsave(&intf
->seqlock
, irqflags
);
235 if (test_bit(ENTRY_TXD_FIRST_FRAGMENT
, &txdesc
->flags
))
237 hdr
->seq_ctrl
&= cpu_to_le16(IEEE80211_SCTL_FRAG
);
238 hdr
->seq_ctrl
|= cpu_to_le16(intf
->seqno
);
240 spin_unlock_irqrestore(&intf
->seqlock
, irqflags
);
242 __set_bit(ENTRY_TXD_GENERATE_SEQ
, &txdesc
->flags
);
245 static void rt2x00queue_create_tx_descriptor_plcp(struct queue_entry
*entry
,
246 struct txentry_desc
*txdesc
,
247 const struct rt2x00_rate
*hwrate
)
249 struct rt2x00_dev
*rt2x00dev
= entry
->queue
->rt2x00dev
;
250 struct ieee80211_tx_info
*tx_info
= IEEE80211_SKB_CB(entry
->skb
);
251 struct ieee80211_tx_rate
*txrate
= &tx_info
->control
.rates
[0];
252 unsigned int data_length
;
253 unsigned int duration
;
254 unsigned int residual
;
256 /* Data length + CRC + Crypto overhead (IV/EIV/ICV/MIC) */
257 data_length
= entry
->skb
->len
+ 4;
258 data_length
+= rt2x00crypto_tx_overhead(rt2x00dev
, entry
->skb
);
262 * Length calculation depends on OFDM/CCK rate.
264 txdesc
->signal
= hwrate
->plcp
;
265 txdesc
->service
= 0x04;
267 if (hwrate
->flags
& DEV_RATE_OFDM
) {
268 txdesc
->length_high
= (data_length
>> 6) & 0x3f;
269 txdesc
->length_low
= data_length
& 0x3f;
272 * Convert length to microseconds.
274 residual
= GET_DURATION_RES(data_length
, hwrate
->bitrate
);
275 duration
= GET_DURATION(data_length
, hwrate
->bitrate
);
281 * Check if we need to set the Length Extension
283 if (hwrate
->bitrate
== 110 && residual
<= 30)
284 txdesc
->service
|= 0x80;
287 txdesc
->length_high
= (duration
>> 8) & 0xff;
288 txdesc
->length_low
= duration
& 0xff;
291 * When preamble is enabled we should set the
292 * preamble bit for the signal.
294 if (txrate
->flags
& IEEE80211_TX_RC_USE_SHORT_PREAMBLE
)
295 txdesc
->signal
|= 0x08;
299 static void rt2x00queue_create_tx_descriptor(struct queue_entry
*entry
,
300 struct txentry_desc
*txdesc
)
302 struct rt2x00_dev
*rt2x00dev
= entry
->queue
->rt2x00dev
;
303 struct ieee80211_tx_info
*tx_info
= IEEE80211_SKB_CB(entry
->skb
);
304 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)entry
->skb
->data
;
305 struct ieee80211_rate
*rate
=
306 ieee80211_get_tx_rate(rt2x00dev
->hw
, tx_info
);
307 const struct rt2x00_rate
*hwrate
;
309 memset(txdesc
, 0, sizeof(*txdesc
));
312 * Initialize information from queue
314 txdesc
->queue
= entry
->queue
->qid
;
315 txdesc
->cw_min
= entry
->queue
->cw_min
;
316 txdesc
->cw_max
= entry
->queue
->cw_max
;
317 txdesc
->aifs
= entry
->queue
->aifs
;
320 * Header and frame information.
322 txdesc
->length
= entry
->skb
->len
;
323 txdesc
->header_length
= ieee80211_get_hdrlen_from_skb(entry
->skb
);
326 * Check whether this frame is to be acked.
328 if (!(tx_info
->flags
& IEEE80211_TX_CTL_NO_ACK
))
329 __set_bit(ENTRY_TXD_ACK
, &txdesc
->flags
);
332 * Check if this is a RTS/CTS frame
334 if (ieee80211_is_rts(hdr
->frame_control
) ||
335 ieee80211_is_cts(hdr
->frame_control
)) {
336 __set_bit(ENTRY_TXD_BURST
, &txdesc
->flags
);
337 if (ieee80211_is_rts(hdr
->frame_control
))
338 __set_bit(ENTRY_TXD_RTS_FRAME
, &txdesc
->flags
);
340 __set_bit(ENTRY_TXD_CTS_FRAME
, &txdesc
->flags
);
341 if (tx_info
->control
.rts_cts_rate_idx
>= 0)
343 ieee80211_get_rts_cts_rate(rt2x00dev
->hw
, tx_info
);
347 * Determine retry information.
349 txdesc
->retry_limit
= tx_info
->control
.rates
[0].count
- 1;
350 if (txdesc
->retry_limit
>= rt2x00dev
->long_retry
)
351 __set_bit(ENTRY_TXD_RETRY_MODE
, &txdesc
->flags
);
354 * Check if more fragments are pending
356 if (ieee80211_has_morefrags(hdr
->frame_control
)) {
357 __set_bit(ENTRY_TXD_BURST
, &txdesc
->flags
);
358 __set_bit(ENTRY_TXD_MORE_FRAG
, &txdesc
->flags
);
362 * Check if more frames (!= fragments) are pending
364 if (tx_info
->flags
& IEEE80211_TX_CTL_MORE_FRAMES
)
365 __set_bit(ENTRY_TXD_BURST
, &txdesc
->flags
);
368 * Beacons and probe responses require the tsf timestamp
369 * to be inserted into the frame, except for a frame that has been injected
370 * through a monitor interface. This latter is needed for testing a
373 if ((ieee80211_is_beacon(hdr
->frame_control
) ||
374 ieee80211_is_probe_resp(hdr
->frame_control
)) &&
375 (!(tx_info
->flags
& IEEE80211_TX_CTL_INJECTED
)))
376 __set_bit(ENTRY_TXD_REQ_TIMESTAMP
, &txdesc
->flags
);
379 * Determine with what IFS priority this frame should be send.
380 * Set ifs to IFS_SIFS when the this is not the first fragment,
381 * or this fragment came after RTS/CTS.
383 if ((tx_info
->flags
& IEEE80211_TX_CTL_FIRST_FRAGMENT
) &&
384 !test_bit(ENTRY_TXD_RTS_FRAME
, &txdesc
->flags
)) {
385 __set_bit(ENTRY_TXD_FIRST_FRAGMENT
, &txdesc
->flags
);
386 txdesc
->ifs
= IFS_BACKOFF
;
388 txdesc
->ifs
= IFS_SIFS
;
391 * Determine rate modulation.
393 hwrate
= rt2x00_get_rate(rate
->hw_value
);
394 txdesc
->rate_mode
= RATE_MODE_CCK
;
395 if (hwrate
->flags
& DEV_RATE_OFDM
)
396 txdesc
->rate_mode
= RATE_MODE_OFDM
;
399 * Apply TX descriptor handling by components
401 rt2x00crypto_create_tx_descriptor(entry
, txdesc
);
402 rt2x00ht_create_tx_descriptor(entry
, txdesc
, hwrate
);
403 rt2x00queue_create_tx_descriptor_seq(entry
, txdesc
);
404 rt2x00queue_create_tx_descriptor_plcp(entry
, txdesc
, hwrate
);
407 static void rt2x00queue_write_tx_descriptor(struct queue_entry
*entry
,
408 struct txentry_desc
*txdesc
)
410 struct data_queue
*queue
= entry
->queue
;
411 struct rt2x00_dev
*rt2x00dev
= queue
->rt2x00dev
;
413 rt2x00dev
->ops
->lib
->write_tx_desc(rt2x00dev
, entry
->skb
, txdesc
);
416 * All processing on the frame has been completed, this means
417 * it is now ready to be dumped to userspace through debugfs.
419 rt2x00debug_dump_frame(rt2x00dev
, DUMP_FRAME_TX
, entry
->skb
);
422 static void rt2x00queue_kick_tx_queue(struct queue_entry
*entry
,
423 struct txentry_desc
*txdesc
)
425 struct data_queue
*queue
= entry
->queue
;
426 struct rt2x00_dev
*rt2x00dev
= queue
->rt2x00dev
;
429 * Check if we need to kick the queue, there are however a few rules
430 * 1) Don't kick unless this is the last in frame in a burst.
431 * When the burst flag is set, this frame is always followed
432 * by another frame which in some way are related to eachother.
433 * This is true for fragments, RTS or CTS-to-self frames.
434 * 2) Rule 1 can be broken when the available entries
435 * in the queue are less then a certain threshold.
437 if (rt2x00queue_threshold(queue
) ||
438 !test_bit(ENTRY_TXD_BURST
, &txdesc
->flags
))
439 rt2x00dev
->ops
->lib
->kick_tx_queue(rt2x00dev
, queue
->qid
);
442 int rt2x00queue_write_tx_frame(struct data_queue
*queue
, struct sk_buff
*skb
,
445 struct ieee80211_tx_info
*tx_info
;
446 struct queue_entry
*entry
= rt2x00queue_get_entry(queue
, Q_INDEX
);
447 struct txentry_desc txdesc
;
448 struct skb_frame_desc
*skbdesc
;
449 u8 rate_idx
, rate_flags
;
451 if (unlikely(rt2x00queue_full(queue
)))
454 if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA
, &entry
->flags
)) {
455 ERROR(queue
->rt2x00dev
,
456 "Arrived at non-free entry in the non-full queue %d.\n"
457 "Please file bug report to %s.\n",
458 queue
->qid
, DRV_PROJECT
);
463 * Copy all TX descriptor information into txdesc,
464 * after that we are free to use the skb->cb array
465 * for our information.
468 rt2x00queue_create_tx_descriptor(entry
, &txdesc
);
471 * All information is retrieved from the skb->cb array,
472 * now we should claim ownership of the driver part of that
473 * array, preserving the bitrate index and flags.
475 tx_info
= IEEE80211_SKB_CB(skb
);
476 rate_idx
= tx_info
->control
.rates
[0].idx
;
477 rate_flags
= tx_info
->control
.rates
[0].flags
;
478 skbdesc
= get_skb_frame_desc(skb
);
479 memset(skbdesc
, 0, sizeof(*skbdesc
));
480 skbdesc
->entry
= entry
;
481 skbdesc
->tx_rate_idx
= rate_idx
;
482 skbdesc
->tx_rate_flags
= rate_flags
;
485 skbdesc
->flags
|= SKBDESC_NOT_MAC80211
;
488 * When hardware encryption is supported, and this frame
489 * is to be encrypted, we should strip the IV/EIV data from
490 * the frame so we can provide it to the driver separately.
492 if (test_bit(ENTRY_TXD_ENCRYPT
, &txdesc
.flags
) &&
493 !test_bit(ENTRY_TXD_ENCRYPT_IV
, &txdesc
.flags
)) {
494 if (test_bit(DRIVER_REQUIRE_COPY_IV
, &queue
->rt2x00dev
->flags
))
495 rt2x00crypto_tx_copy_iv(skb
, &txdesc
);
497 rt2x00crypto_tx_remove_iv(skb
, &txdesc
);
501 * When DMA allocation is required we should guarentee to the
502 * driver that the DMA is aligned to a 4-byte boundary.
503 * However some drivers require L2 padding to pad the payload
504 * rather then the header. This could be a requirement for
505 * PCI and USB devices, while header alignment only is valid
508 if (test_bit(DRIVER_REQUIRE_L2PAD
, &queue
->rt2x00dev
->flags
))
509 rt2x00queue_insert_l2pad(entry
->skb
, txdesc
.header_length
);
510 else if (test_bit(DRIVER_REQUIRE_DMA
, &queue
->rt2x00dev
->flags
))
511 rt2x00queue_align_frame(entry
->skb
);
514 * It could be possible that the queue was corrupted and this
515 * call failed. Since we always return NETDEV_TX_OK to mac80211,
516 * this frame will simply be dropped.
518 if (unlikely(queue
->rt2x00dev
->ops
->lib
->write_tx_data(entry
,
520 clear_bit(ENTRY_OWNER_DEVICE_DATA
, &entry
->flags
);
525 set_bit(ENTRY_DATA_PENDING
, &entry
->flags
);
527 rt2x00queue_index_inc(queue
, Q_INDEX
);
528 rt2x00queue_write_tx_descriptor(entry
, &txdesc
);
529 rt2x00queue_kick_tx_queue(entry
, &txdesc
);
534 int rt2x00queue_update_beacon(struct rt2x00_dev
*rt2x00dev
,
535 struct ieee80211_vif
*vif
,
536 const bool enable_beacon
)
538 struct rt2x00_intf
*intf
= vif_to_intf(vif
);
539 struct skb_frame_desc
*skbdesc
;
540 struct txentry_desc txdesc
;
542 if (unlikely(!intf
->beacon
))
545 mutex_lock(&intf
->beacon_skb_mutex
);
548 * Clean up the beacon skb.
550 rt2x00queue_free_skb(rt2x00dev
, intf
->beacon
->skb
);
551 intf
->beacon
->skb
= NULL
;
553 if (!enable_beacon
) {
554 rt2x00dev
->ops
->lib
->kill_tx_queue(rt2x00dev
, QID_BEACON
);
555 mutex_unlock(&intf
->beacon_skb_mutex
);
559 intf
->beacon
->skb
= ieee80211_beacon_get(rt2x00dev
->hw
, vif
);
560 if (!intf
->beacon
->skb
) {
561 mutex_unlock(&intf
->beacon_skb_mutex
);
566 * Copy all TX descriptor information into txdesc,
567 * after that we are free to use the skb->cb array
568 * for our information.
570 rt2x00queue_create_tx_descriptor(intf
->beacon
, &txdesc
);
573 * Fill in skb descriptor
575 skbdesc
= get_skb_frame_desc(intf
->beacon
->skb
);
576 memset(skbdesc
, 0, sizeof(*skbdesc
));
577 skbdesc
->entry
= intf
->beacon
;
580 * Send beacon to hardware and enable beacon genaration..
582 rt2x00dev
->ops
->lib
->write_beacon(intf
->beacon
, &txdesc
);
584 mutex_unlock(&intf
->beacon_skb_mutex
);
589 struct data_queue
*rt2x00queue_get_queue(struct rt2x00_dev
*rt2x00dev
,
590 const enum data_queue_qid queue
)
592 int atim
= test_bit(DRIVER_REQUIRE_ATIM_QUEUE
, &rt2x00dev
->flags
);
595 return rt2x00dev
->rx
;
597 if (queue
< rt2x00dev
->ops
->tx_queues
&& rt2x00dev
->tx
)
598 return &rt2x00dev
->tx
[queue
];
603 if (queue
== QID_BEACON
)
604 return &rt2x00dev
->bcn
[0];
605 else if (queue
== QID_ATIM
&& atim
)
606 return &rt2x00dev
->bcn
[1];
610 EXPORT_SYMBOL_GPL(rt2x00queue_get_queue
);
612 struct queue_entry
*rt2x00queue_get_entry(struct data_queue
*queue
,
613 enum queue_index index
)
615 struct queue_entry
*entry
;
616 unsigned long irqflags
;
618 if (unlikely(index
>= Q_INDEX_MAX
)) {
619 ERROR(queue
->rt2x00dev
,
620 "Entry requested from invalid index type (%d)\n", index
);
624 spin_lock_irqsave(&queue
->lock
, irqflags
);
626 entry
= &queue
->entries
[queue
->index
[index
]];
628 spin_unlock_irqrestore(&queue
->lock
, irqflags
);
632 EXPORT_SYMBOL_GPL(rt2x00queue_get_entry
);
634 void rt2x00queue_index_inc(struct data_queue
*queue
, enum queue_index index
)
636 unsigned long irqflags
;
638 if (unlikely(index
>= Q_INDEX_MAX
)) {
639 ERROR(queue
->rt2x00dev
,
640 "Index change on invalid index type (%d)\n", index
);
644 spin_lock_irqsave(&queue
->lock
, irqflags
);
646 queue
->index
[index
]++;
647 if (queue
->index
[index
] >= queue
->limit
)
648 queue
->index
[index
] = 0;
650 if (index
== Q_INDEX
) {
652 } else if (index
== Q_INDEX_DONE
) {
657 spin_unlock_irqrestore(&queue
->lock
, irqflags
);
660 static void rt2x00queue_reset(struct data_queue
*queue
)
662 unsigned long irqflags
;
664 spin_lock_irqsave(&queue
->lock
, irqflags
);
668 memset(queue
->index
, 0, sizeof(queue
->index
));
670 spin_unlock_irqrestore(&queue
->lock
, irqflags
);
673 void rt2x00queue_stop_queues(struct rt2x00_dev
*rt2x00dev
)
675 struct data_queue
*queue
;
677 txall_queue_for_each(rt2x00dev
, queue
)
678 rt2x00dev
->ops
->lib
->kill_tx_queue(rt2x00dev
, queue
->qid
);
681 void rt2x00queue_init_queues(struct rt2x00_dev
*rt2x00dev
)
683 struct data_queue
*queue
;
686 queue_for_each(rt2x00dev
, queue
) {
687 rt2x00queue_reset(queue
);
689 for (i
= 0; i
< queue
->limit
; i
++) {
690 queue
->entries
[i
].flags
= 0;
692 rt2x00dev
->ops
->lib
->clear_entry(&queue
->entries
[i
]);
697 static int rt2x00queue_alloc_entries(struct data_queue
*queue
,
698 const struct data_queue_desc
*qdesc
)
700 struct queue_entry
*entries
;
701 unsigned int entry_size
;
704 rt2x00queue_reset(queue
);
706 queue
->limit
= qdesc
->entry_num
;
707 queue
->threshold
= DIV_ROUND_UP(qdesc
->entry_num
, 10);
708 queue
->data_size
= qdesc
->data_size
;
709 queue
->desc_size
= qdesc
->desc_size
;
712 * Allocate all queue entries.
714 entry_size
= sizeof(*entries
) + qdesc
->priv_size
;
715 entries
= kzalloc(queue
->limit
* entry_size
, GFP_KERNEL
);
719 #define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
720 ( ((char *)(__base)) + ((__limit) * (__esize)) + \
721 ((__index) * (__psize)) )
723 for (i
= 0; i
< queue
->limit
; i
++) {
724 entries
[i
].flags
= 0;
725 entries
[i
].queue
= queue
;
726 entries
[i
].skb
= NULL
;
727 entries
[i
].entry_idx
= i
;
728 entries
[i
].priv_data
=
729 QUEUE_ENTRY_PRIV_OFFSET(entries
, i
, queue
->limit
,
730 sizeof(*entries
), qdesc
->priv_size
);
733 #undef QUEUE_ENTRY_PRIV_OFFSET
735 queue
->entries
= entries
;
740 static void rt2x00queue_free_skbs(struct rt2x00_dev
*rt2x00dev
,
741 struct data_queue
*queue
)
748 for (i
= 0; i
< queue
->limit
; i
++) {
749 if (queue
->entries
[i
].skb
)
750 rt2x00queue_free_skb(rt2x00dev
, queue
->entries
[i
].skb
);
754 static int rt2x00queue_alloc_rxskbs(struct rt2x00_dev
*rt2x00dev
,
755 struct data_queue
*queue
)
760 for (i
= 0; i
< queue
->limit
; i
++) {
761 skb
= rt2x00queue_alloc_rxskb(rt2x00dev
, &queue
->entries
[i
]);
764 queue
->entries
[i
].skb
= skb
;
770 int rt2x00queue_initialize(struct rt2x00_dev
*rt2x00dev
)
772 struct data_queue
*queue
;
775 status
= rt2x00queue_alloc_entries(rt2x00dev
->rx
, rt2x00dev
->ops
->rx
);
779 tx_queue_for_each(rt2x00dev
, queue
) {
780 status
= rt2x00queue_alloc_entries(queue
, rt2x00dev
->ops
->tx
);
785 status
= rt2x00queue_alloc_entries(rt2x00dev
->bcn
, rt2x00dev
->ops
->bcn
);
789 if (test_bit(DRIVER_REQUIRE_ATIM_QUEUE
, &rt2x00dev
->flags
)) {
790 status
= rt2x00queue_alloc_entries(&rt2x00dev
->bcn
[1],
791 rt2x00dev
->ops
->atim
);
796 status
= rt2x00queue_alloc_rxskbs(rt2x00dev
, rt2x00dev
->rx
);
803 ERROR(rt2x00dev
, "Queue entries allocation failed.\n");
805 rt2x00queue_uninitialize(rt2x00dev
);
810 void rt2x00queue_uninitialize(struct rt2x00_dev
*rt2x00dev
)
812 struct data_queue
*queue
;
814 rt2x00queue_free_skbs(rt2x00dev
, rt2x00dev
->rx
);
816 queue_for_each(rt2x00dev
, queue
) {
817 kfree(queue
->entries
);
818 queue
->entries
= NULL
;
822 static void rt2x00queue_init(struct rt2x00_dev
*rt2x00dev
,
823 struct data_queue
*queue
, enum data_queue_qid qid
)
825 spin_lock_init(&queue
->lock
);
827 queue
->rt2x00dev
= rt2x00dev
;
835 int rt2x00queue_allocate(struct rt2x00_dev
*rt2x00dev
)
837 struct data_queue
*queue
;
838 enum data_queue_qid qid
;
839 unsigned int req_atim
=
840 !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE
, &rt2x00dev
->flags
);
843 * We need the following queues:
847 * Atim: 1 (if required)
849 rt2x00dev
->data_queues
= 2 + rt2x00dev
->ops
->tx_queues
+ req_atim
;
851 queue
= kzalloc(rt2x00dev
->data_queues
* sizeof(*queue
), GFP_KERNEL
);
853 ERROR(rt2x00dev
, "Queue allocation failed.\n");
858 * Initialize pointers
860 rt2x00dev
->rx
= queue
;
861 rt2x00dev
->tx
= &queue
[1];
862 rt2x00dev
->bcn
= &queue
[1 + rt2x00dev
->ops
->tx_queues
];
865 * Initialize queue parameters.
867 * TX: qid = QID_AC_BE + index
868 * TX: cw_min: 2^5 = 32.
869 * TX: cw_max: 2^10 = 1024.
870 * BCN: qid = QID_BEACON
871 * ATIM: qid = QID_ATIM
873 rt2x00queue_init(rt2x00dev
, rt2x00dev
->rx
, QID_RX
);
876 tx_queue_for_each(rt2x00dev
, queue
)
877 rt2x00queue_init(rt2x00dev
, queue
, qid
++);
879 rt2x00queue_init(rt2x00dev
, &rt2x00dev
->bcn
[0], QID_BEACON
);
881 rt2x00queue_init(rt2x00dev
, &rt2x00dev
->bcn
[1], QID_ATIM
);
886 void rt2x00queue_free(struct rt2x00_dev
*rt2x00dev
)
888 kfree(rt2x00dev
->rx
);
889 rt2x00dev
->rx
= NULL
;
890 rt2x00dev
->tx
= NULL
;
891 rt2x00dev
->bcn
= NULL
;