2 Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
3 <http://rt2x00.serialmonkey.com>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, see <http://www.gnu.org/licenses/>.
21 Abstract: rt2x00 queue datastructures and routines
27 #include <linux/prefetch.h>
30 * DOC: Entry frame size
32 * Ralink PCI devices demand the Frame size to be a multiple of 128 bytes,
33 * for USB devices this restriction does not apply, but the value of
34 * 2432 makes sense since it is big enough to contain the maximum fragment
35 * size according to the ieee802.11 specs.
36 * The aggregation size depends on support from the driver, but should
37 * be something around 3840 bytes.
39 #define DATA_FRAME_SIZE 2432
40 #define MGMT_FRAME_SIZE 256
41 #define AGGREGATION_SIZE 3840
44 * enum data_queue_qid: Queue identification
46 * @QID_AC_VO: AC VO queue
47 * @QID_AC_VI: AC VI queue
48 * @QID_AC_BE: AC BE queue
49 * @QID_AC_BK: AC BK queue
50 * @QID_HCCA: HCCA queue
51 * @QID_MGMT: MGMT queue (prio queue)
53 * @QID_OTHER: None of the above (don't use, only present for completeness)
54 * @QID_BEACON: Beacon queue (value unspecified, don't send it to device)
55 * @QID_ATIM: Atim queue (value unspecified, don't send it to device)
71 * enum skb_frame_desc_flags: Flags for &struct skb_frame_desc
73 * @SKBDESC_DMA_MAPPED_RX: &skb_dma field has been mapped for RX
74 * @SKBDESC_DMA_MAPPED_TX: &skb_dma field has been mapped for TX
75 * @SKBDESC_IV_STRIPPED: Frame contained a IV/EIV provided by
76 * mac80211 but was stripped for processing by the driver.
77 * @SKBDESC_NOT_MAC80211: Frame didn't originate from mac80211,
78 * don't try to pass it back.
79 * @SKBDESC_DESC_IN_SKB: The descriptor is at the start of the
80 * skb, instead of in the desc field.
82 enum skb_frame_desc_flags {
83 SKBDESC_DMA_MAPPED_RX = 1 << 0,
84 SKBDESC_DMA_MAPPED_TX = 1 << 1,
85 SKBDESC_IV_STRIPPED = 1 << 2,
86 SKBDESC_NOT_MAC80211 = 1 << 3,
87 SKBDESC_DESC_IN_SKB = 1 << 4,
91 * struct skb_frame_desc: Descriptor information for the skb buffer
93 * This structure is placed over the driver_data array, this means that
94 * this structure should not exceed the size of that array (40 bytes).
96 * @flags: Frame flags, see &enum skb_frame_desc_flags.
97 * @desc_len: Length of the frame descriptor.
98 * @tx_rate_idx: the index of the TX rate, used for TX status reporting
99 * @tx_rate_flags: the TX rate flags, used for TX status reporting
100 * @desc: Pointer to descriptor part of the frame.
101 * Note that this pointer could point to something outside
102 * of the scope of the skb->data pointer.
103 * @iv: IV/EIV data used during encryption/decryption.
104 * @skb_dma: (PCI-only) the DMA address associated with the sk buffer.
105 * @entry: The entry to which this sk buffer belongs.
107 struct skb_frame_desc {
122 * get_skb_frame_desc - Obtain the rt2x00 frame descriptor from a sk_buff.
123 * @skb: &struct sk_buff from where we obtain the &struct skb_frame_desc
125 static inline struct skb_frame_desc* get_skb_frame_desc(struct sk_buff *skb)
127 BUILD_BUG_ON(sizeof(struct skb_frame_desc) >
128 IEEE80211_TX_INFO_DRIVER_DATA_SIZE);
129 return (struct skb_frame_desc *)&IEEE80211_SKB_CB(skb)->driver_data;
133 * enum rxdone_entry_desc_flags: Flags for &struct rxdone_entry_desc
135 * @RXDONE_SIGNAL_PLCP: Signal field contains the plcp value.
136 * @RXDONE_SIGNAL_BITRATE: Signal field contains the bitrate value.
137 * @RXDONE_SIGNAL_MCS: Signal field contains the mcs value.
138 * @RXDONE_MY_BSS: Does this frame originate from device's BSS.
139 * @RXDONE_CRYPTO_IV: Driver provided IV/EIV data.
140 * @RXDONE_CRYPTO_ICV: Driver provided ICV data.
141 * @RXDONE_L2PAD: 802.11 payload has been padded to 4-byte boundary.
143 enum rxdone_entry_desc_flags {
144 RXDONE_SIGNAL_PLCP = BIT(0),
145 RXDONE_SIGNAL_BITRATE = BIT(1),
146 RXDONE_SIGNAL_MCS = BIT(2),
147 RXDONE_MY_BSS = BIT(3),
148 RXDONE_CRYPTO_IV = BIT(4),
149 RXDONE_CRYPTO_ICV = BIT(5),
150 RXDONE_L2PAD = BIT(6),
154 * RXDONE_SIGNAL_MASK - Define to mask off all &rxdone_entry_desc_flags flags
155 * except for the RXDONE_SIGNAL_* flags. This is useful to convert the dev_flags
156 * from &rxdone_entry_desc to a signal value type.
158 #define RXDONE_SIGNAL_MASK \
159 ( RXDONE_SIGNAL_PLCP | RXDONE_SIGNAL_BITRATE | RXDONE_SIGNAL_MCS )
162 * struct rxdone_entry_desc: RX Entry descriptor
164 * Summary of information that has been read from the RX frame descriptor.
166 * @timestamp: RX Timestamp
167 * @signal: Signal of the received frame.
168 * @rssi: RSSI of the received frame.
169 * @size: Data size of the received frame.
170 * @flags: MAC80211 receive flags (See &enum mac80211_rx_flags).
171 * @dev_flags: Ralink receive flags (See &enum rxdone_entry_desc_flags).
172 * @rate_mode: Rate mode (See @enum rate_modulation).
173 * @cipher: Cipher type used during decryption.
174 * @cipher_status: Decryption status.
175 * @iv: IV/EIV data used during decryption.
176 * @icv: ICV data used during decryption.
178 struct rxdone_entry_desc {
194 * enum txdone_entry_desc_flags: Flags for &struct txdone_entry_desc
196 * Every txdone report has to contain the basic result of the
197 * transmission, either &TXDONE_UNKNOWN, &TXDONE_SUCCESS or
198 * &TXDONE_FAILURE. The flag &TXDONE_FALLBACK can be used in
199 * conjunction with all of these flags but should only be set
200 * if retires > 0. The flag &TXDONE_EXCESSIVE_RETRY can only be used
201 * in conjunction with &TXDONE_FAILURE.
203 * @TXDONE_UNKNOWN: Hardware could not determine success of transmission.
204 * @TXDONE_SUCCESS: Frame was successfully send
205 * @TXDONE_FALLBACK: Hardware used fallback rates for retries
206 * @TXDONE_FAILURE: Frame was not successfully send
207 * @TXDONE_EXCESSIVE_RETRY: In addition to &TXDONE_FAILURE, the
208 * frame transmission failed due to excessive retries.
210 enum txdone_entry_desc_flags {
215 TXDONE_EXCESSIVE_RETRY,
220 * struct txdone_entry_desc: TX done entry descriptor
222 * Summary of information that has been read from the TX frame descriptor
223 * after the device is done with transmission.
225 * @flags: TX done flags (See &enum txdone_entry_desc_flags).
226 * @retry: Retry count.
228 struct txdone_entry_desc {
234 * enum txentry_desc_flags: Status flags for TX entry descriptor
236 * @ENTRY_TXD_RTS_FRAME: This frame is a RTS frame.
237 * @ENTRY_TXD_CTS_FRAME: This frame is a CTS-to-self frame.
238 * @ENTRY_TXD_GENERATE_SEQ: This frame requires sequence counter.
239 * @ENTRY_TXD_FIRST_FRAGMENT: This is the first frame.
240 * @ENTRY_TXD_MORE_FRAG: This frame is followed by another fragment.
241 * @ENTRY_TXD_REQ_TIMESTAMP: Require timestamp to be inserted.
242 * @ENTRY_TXD_BURST: This frame belongs to the same burst event.
243 * @ENTRY_TXD_ACK: An ACK is required for this frame.
244 * @ENTRY_TXD_RETRY_MODE: When set, the long retry count is used.
245 * @ENTRY_TXD_ENCRYPT: This frame should be encrypted.
246 * @ENTRY_TXD_ENCRYPT_PAIRWISE: Use pairwise key table (instead of shared).
247 * @ENTRY_TXD_ENCRYPT_IV: Generate IV/EIV in hardware.
248 * @ENTRY_TXD_ENCRYPT_MMIC: Generate MIC in hardware.
249 * @ENTRY_TXD_HT_AMPDU: This frame is part of an AMPDU.
250 * @ENTRY_TXD_HT_BW_40: Use 40MHz Bandwidth.
251 * @ENTRY_TXD_HT_SHORT_GI: Use short GI.
252 * @ENTRY_TXD_HT_MIMO_PS: The receiving STA is in dynamic SM PS mode.
254 enum txentry_desc_flags {
257 ENTRY_TXD_GENERATE_SEQ,
258 ENTRY_TXD_FIRST_FRAGMENT,
260 ENTRY_TXD_REQ_TIMESTAMP,
263 ENTRY_TXD_RETRY_MODE,
265 ENTRY_TXD_ENCRYPT_PAIRWISE,
266 ENTRY_TXD_ENCRYPT_IV,
267 ENTRY_TXD_ENCRYPT_MMIC,
270 ENTRY_TXD_HT_SHORT_GI,
271 ENTRY_TXD_HT_MIMO_PS,
275 * struct txentry_desc: TX Entry descriptor
277 * Summary of information for the frame descriptor before sending a TX frame.
279 * @flags: Descriptor flags (See &enum queue_entry_flags).
280 * @length: Length of the entire frame.
281 * @header_length: Length of 802.11 header.
282 * @length_high: PLCP length high word.
283 * @length_low: PLCP length low word.
284 * @signal: PLCP signal.
285 * @service: PLCP service.
287 * @stbc: Use Space Time Block Coding (only available for MCS rates < 8).
288 * @ba_size: Size of the recepients RX reorder buffer - 1.
289 * @rate_mode: Rate mode (See @enum rate_modulation).
290 * @mpdu_density: MDPU density.
291 * @retry_limit: Max number of retries.
293 * @txop: IFS value for 11n capable chips.
294 * @cipher: Cipher type used for encryption.
295 * @key_idx: Key index used for encryption.
296 * @iv_offset: Position where IV should be inserted by hardware.
297 * @iv_len: Length of IV data.
299 struct txentry_desc {
324 enum rate_modulation rate_mode;
335 * enum queue_entry_flags: Status flags for queue entry
337 * @ENTRY_BCN_ASSIGNED: This entry has been assigned to an interface.
338 * As long as this bit is set, this entry may only be touched
339 * through the interface structure.
340 * @ENTRY_OWNER_DEVICE_DATA: This entry is owned by the device for data
341 * transfer (either TX or RX depending on the queue). The entry should
342 * only be touched after the device has signaled it is done with it.
343 * @ENTRY_DATA_PENDING: This entry contains a valid frame and is waiting
344 * for the signal to start sending.
345 * @ENTRY_DATA_IO_FAILED: Hardware indicated that an IO error occurred
346 * while transferring the data to the hardware. No TX status report will
347 * be expected from the hardware.
348 * @ENTRY_DATA_STATUS_PENDING: The entry has been send to the device and
349 * returned. It is now waiting for the status reporting before the
350 * entry can be reused again.
352 enum queue_entry_flags {
355 ENTRY_OWNER_DEVICE_DATA,
357 ENTRY_DATA_IO_FAILED,
358 ENTRY_DATA_STATUS_PENDING,
359 ENTRY_DATA_STATUS_SET,
363 * struct queue_entry: Entry inside the &struct data_queue
365 * @flags: Entry flags, see &enum queue_entry_flags.
366 * @last_action: Timestamp of last change.
367 * @queue: The data queue (&struct data_queue) to which this entry belongs.
368 * @skb: The buffer which is currently being transmitted (for TX queue),
369 * or used to directly receive data in (for RX queue).
370 * @entry_idx: The entry index number.
371 * @priv_data: Private data belonging to this queue entry. The pointer
372 * points to data specific to a particular driver and queue type.
373 * @status: Device specific status
377 unsigned long last_action;
379 struct data_queue *queue;
383 unsigned int entry_idx;
391 * enum queue_index: Queue index type
393 * @Q_INDEX: Index pointer to the current entry in the queue, if this entry is
394 * owned by the hardware then the queue is considered to be full.
395 * @Q_INDEX_DMA_DONE: Index pointer for the next entry which will have been
396 * transferred to the hardware.
397 * @Q_INDEX_DONE: Index pointer to the next entry which will be completed by
398 * the hardware and for which we need to run the txdone handler. If this
399 * entry is not owned by the hardware the queue is considered to be empty.
400 * @Q_INDEX_MAX: Keep last, used in &struct data_queue to determine the size
401 * of the index array.
411 * enum data_queue_flags: Status flags for data queues
413 * @QUEUE_STARTED: The queue has been started. Fox RX queues this means the
414 * device might be DMA'ing skbuffers. TX queues will accept skbuffers to
415 * be transmitted and beacon queues will start beaconing the configured
417 * @QUEUE_PAUSED: The queue has been started but is currently paused.
418 * When this bit is set, the queue has been stopped in mac80211,
419 * preventing new frames to be enqueued. However, a few frames
420 * might still appear shortly after the pausing...
422 enum data_queue_flags {
428 * struct data_queue: Data queue
430 * @rt2x00dev: Pointer to main &struct rt2x00dev where this queue belongs to.
431 * @entries: Base address of the &struct queue_entry which are
432 * part of this queue.
433 * @qid: The queue identification, see &enum data_queue_qid.
434 * @flags: Entry flags, see &enum queue_entry_flags.
435 * @status_lock: The mutex for protecting the start/stop/flush
436 * handling on this queue.
437 * @tx_lock: Spinlock to serialize tx operations on this queue.
438 * @index_lock: Spinlock to protect index handling. Whenever @index, @index_done or
439 * @index_crypt needs to be changed this lock should be grabbed to prevent
440 * index corruption due to concurrency.
441 * @count: Number of frames handled in the queue.
442 * @limit: Maximum number of entries in the queue.
443 * @threshold: Minimum number of free entries before queue is kicked by force.
444 * @length: Number of frames in queue.
445 * @index: Index pointers to entry positions in the queue,
446 * use &enum queue_index to get a specific index field.
447 * @txop: maximum burst time.
448 * @aifs: The aifs value for outgoing frames (field ignored in RX queue).
449 * @cw_min: The cw min value for outgoing frames (field ignored in RX queue).
450 * @cw_max: The cw max value for outgoing frames (field ignored in RX queue).
451 * @data_size: Maximum data size for the frames in this queue.
452 * @desc_size: Hardware descriptor size for the data in this queue.
453 * @priv_size: Size of per-queue_entry private data.
454 * @usb_endpoint: Device endpoint used for communication (USB only)
455 * @usb_maxpacket: Max packet size for given endpoint (USB only)
458 struct rt2x00_dev *rt2x00dev;
459 struct queue_entry *entries;
461 enum data_queue_qid qid;
464 struct mutex status_lock;
466 spinlock_t index_lock;
469 unsigned short limit;
470 unsigned short threshold;
471 unsigned short length;
472 unsigned short index[Q_INDEX_MAX];
476 unsigned short cw_min;
477 unsigned short cw_max;
479 unsigned short data_size;
480 unsigned char desc_size;
481 unsigned char winfo_size;
482 unsigned short priv_size;
484 unsigned short usb_endpoint;
485 unsigned short usb_maxpacket;
489 * queue_end - Return pointer to the last queue (HELPER MACRO).
490 * @__dev: Pointer to &struct rt2x00_dev
492 * Using the base rx pointer and the maximum number of available queues,
493 * this macro will return the address of 1 position beyond the end of the
496 #define queue_end(__dev) \
497 &(__dev)->rx[(__dev)->data_queues]
500 * tx_queue_end - Return pointer to the last TX queue (HELPER MACRO).
501 * @__dev: Pointer to &struct rt2x00_dev
503 * Using the base tx pointer and the maximum number of available TX
504 * queues, this macro will return the address of 1 position beyond
505 * the end of the TX queue array.
507 #define tx_queue_end(__dev) \
508 &(__dev)->tx[(__dev)->ops->tx_queues]
511 * queue_next - Return pointer to next queue in list (HELPER MACRO).
512 * @__queue: Current queue for which we need the next queue
514 * Using the current queue address we take the address directly
515 * after the queue to take the next queue. Note that this macro
516 * should be used carefully since it does not protect against
517 * moving past the end of the list. (See macros &queue_end and
518 * &tx_queue_end for determining the end of the queue).
520 #define queue_next(__queue) \
524 * queue_loop - Loop through the queues within a specific range (HELPER MACRO).
525 * @__entry: Pointer where the current queue entry will be stored in.
526 * @__start: Start queue pointer.
527 * @__end: End queue pointer.
529 * This macro will loop through all queues between &__start and &__end.
531 #define queue_loop(__entry, __start, __end) \
532 for ((__entry) = (__start); \
533 prefetch(queue_next(__entry)), (__entry) != (__end);\
534 (__entry) = queue_next(__entry))
537 * queue_for_each - Loop through all queues
538 * @__dev: Pointer to &struct rt2x00_dev
539 * @__entry: Pointer where the current queue entry will be stored in.
541 * This macro will loop through all available queues.
543 #define queue_for_each(__dev, __entry) \
544 queue_loop(__entry, (__dev)->rx, queue_end(__dev))
547 * tx_queue_for_each - Loop through the TX queues
548 * @__dev: Pointer to &struct rt2x00_dev
549 * @__entry: Pointer where the current queue entry will be stored in.
551 * This macro will loop through all TX related queues excluding
552 * the Beacon and Atim queues.
554 #define tx_queue_for_each(__dev, __entry) \
555 queue_loop(__entry, (__dev)->tx, tx_queue_end(__dev))
558 * txall_queue_for_each - Loop through all TX related queues
559 * @__dev: Pointer to &struct rt2x00_dev
560 * @__entry: Pointer where the current queue entry will be stored in.
562 * This macro will loop through all TX related queues including
563 * the Beacon and Atim queues.
565 #define txall_queue_for_each(__dev, __entry) \
566 queue_loop(__entry, (__dev)->tx, queue_end(__dev))
569 * rt2x00queue_for_each_entry - Loop through all entries in the queue
570 * @queue: Pointer to @data_queue
571 * @start: &enum queue_index Pointer to start index
572 * @end: &enum queue_index Pointer to end index
573 * @data: Data to pass to the callback function
574 * @fn: The function to call for each &struct queue_entry
576 * This will walk through all entries in the queue, in chronological
577 * order. This means it will start at the current @start pointer
578 * and will walk through the queue until it reaches the @end pointer.
580 * If fn returns true for an entry rt2x00queue_for_each_entry will stop
581 * processing and return true as well.
583 bool rt2x00queue_for_each_entry(struct data_queue *queue,
584 enum queue_index start,
585 enum queue_index end,
587 bool (*fn)(struct queue_entry *entry,
591 * rt2x00queue_empty - Check if the queue is empty.
592 * @queue: Queue to check if empty.
594 static inline int rt2x00queue_empty(struct data_queue *queue)
596 return queue->length == 0;
600 * rt2x00queue_full - Check if the queue is full.
601 * @queue: Queue to check if full.
603 static inline int rt2x00queue_full(struct data_queue *queue)
605 return queue->length == queue->limit;
609 * rt2x00queue_free - Check the number of available entries in queue.
610 * @queue: Queue to check.
612 static inline int rt2x00queue_available(struct data_queue *queue)
614 return queue->limit - queue->length;
618 * rt2x00queue_threshold - Check if the queue is below threshold
619 * @queue: Queue to check.
621 static inline int rt2x00queue_threshold(struct data_queue *queue)
623 return rt2x00queue_available(queue) < queue->threshold;
626 * rt2x00queue_dma_timeout - Check if a timeout occurred for DMA transfers
627 * @entry: Queue entry to check.
629 static inline int rt2x00queue_dma_timeout(struct queue_entry *entry)
631 if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
633 return time_after(jiffies, entry->last_action + msecs_to_jiffies(100));
637 * _rt2x00_desc_read - Read a word from the hardware descriptor.
638 * @desc: Base descriptor address
639 * @word: Word index from where the descriptor should be read.
640 * @value: Address where the descriptor value should be written into.
642 static inline void _rt2x00_desc_read(__le32 *desc, const u8 word, __le32 *value)
648 * rt2x00_desc_read - Read a word from the hardware descriptor, this
649 * function will take care of the byte ordering.
650 * @desc: Base descriptor address
651 * @word: Word index from where the descriptor should be read.
652 * @value: Address where the descriptor value should be written into.
654 static inline void rt2x00_desc_read(__le32 *desc, const u8 word, u32 *value)
657 _rt2x00_desc_read(desc, word, &tmp);
658 *value = le32_to_cpu(tmp);
662 * rt2x00_desc_write - write a word to the hardware descriptor, this
663 * function will take care of the byte ordering.
664 * @desc: Base descriptor address
665 * @word: Word index from where the descriptor should be written.
666 * @value: Value that should be written into the descriptor.
668 static inline void _rt2x00_desc_write(__le32 *desc, const u8 word, __le32 value)
674 * rt2x00_desc_write - write a word to the hardware descriptor.
675 * @desc: Base descriptor address
676 * @word: Word index from where the descriptor should be written.
677 * @value: Value that should be written into the descriptor.
679 static inline void rt2x00_desc_write(__le32 *desc, const u8 word, u32 value)
681 _rt2x00_desc_write(desc, word, cpu_to_le32(value));
684 #endif /* RT2X00QUEUE_H */