2 Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
3 <http://rt2x00.serialmonkey.com>
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23 Abstract: rt2x00 queue datastructures and routines
29 #include <linux/prefetch.h>
32 * DOC: Entrie frame size
34 * Ralink PCI devices demand the Frame size to be a multiple of 128 bytes,
35 * for USB devices this restriction does not apply, but the value of
36 * 2432 makes sense since it is big enough to contain the maximum fragment
37 * size according to the ieee802.11 specs.
39 #define DATA_FRAME_SIZE 2432
40 #define MGMT_FRAME_SIZE 256
43 * DOC: Number of entries per queue
45 * After research it was concluded that 12 entries in a RX and TX
46 * queue would be sufficient. Although this is almost one third of
47 * the amount the legacy driver allocated, the queues aren't getting
48 * filled to the maximum even when working with the maximum rate.
52 #define BEACON_ENTRIES 1
53 #define ATIM_ENTRIES 1
56 * enum data_queue_qid: Queue identification
58 * @QID_AC_BE: AC BE queue
59 * @QID_AC_BK: AC BK queue
60 * @QID_AC_VI: AC VI queue
61 * @QID_AC_VO: AC VO queue
62 * @QID_HCCA: HCCA queue
63 * @QID_MGMT: MGMT queue (prio queue)
65 * @QID_OTHER: None of the above (don't use, only present for completeness)
66 * @QID_BEACON: Beacon queue (value unspecified, don't send it to device)
67 * @QID_ATIM: Atim queue (value unspeficied, don't send it to device)
83 * mac80211_queue_to_qid - Convert mac80211 queue to rt2x00 qid
84 * @queue: mac80211 queue.
86 static inline enum data_queue_qid mac80211_queue_to_qid(unsigned int queue)
88 /* Regular TX queues are mapped directly */
96 * enum skb_frame_desc_flags: Flags for &struct skb_frame_desc
98 * @FRAME_DESC_DRIVER_GENERATED: Frame was generated inside driver
99 * and should not be reported back to mac80211 during txdone.
101 enum skb_frame_desc_flags {
102 FRAME_DESC_DRIVER_GENERATED = 1 << 0,
106 * struct skb_frame_desc: Descriptor information for the skb buffer
108 * This structure is placed over the skb->cb array, this means that
109 * this structure should not exceed the size of that array (48 bytes).
111 * @flags: Frame flags, see &enum skb_frame_desc_flags.
112 * @data: Pointer to data part of frame (Start of ieee80211 header).
113 * @desc: Pointer to descriptor part of the frame.
114 * Note that this pointer could point to something outside
115 * of the scope of the skb->data pointer.
116 * @data_len: Length of the frame data.
117 * @desc_len: Length of the frame descriptor.
118 * @entry: The entry to which this sk buffer belongs.
120 struct skb_frame_desc {
123 unsigned short data_len;
124 unsigned short desc_len;
129 struct queue_entry *entry;
132 static inline struct skb_frame_desc* get_skb_frame_desc(struct sk_buff *skb)
134 BUILD_BUG_ON(sizeof(struct skb_frame_desc) > sizeof(skb->cb));
135 return (struct skb_frame_desc *)&skb->cb[0];
139 * enum rxdone_entry_desc_flags: Flags for &struct rxdone_entry_desc
141 * @RXDONE_SIGNAL_PLCP: Does the signal field contain the plcp value,
142 * or does it contain the bitrate itself.
143 * @RXDONE_MY_BSS: Does this frame originate from device's BSS.
145 enum rxdone_entry_desc_flags {
146 RXDONE_SIGNAL_PLCP = 1 << 0,
147 RXDONE_MY_BSS = 1 << 1,
151 * struct rxdone_entry_desc: RX Entry descriptor
153 * Summary of information that has been read from the RX frame descriptor.
155 * @signal: Signal of the received frame.
156 * @rssi: RSSI of the received frame.
157 * @size: Data size of the received frame.
158 * @flags: MAC80211 receive flags (See &enum mac80211_rx_flags).
159 * @dev_flags: Ralink receive flags (See &enum rxdone_entry_desc_flags).
162 struct rxdone_entry_desc {
171 * struct txdone_entry_desc: TX done entry descriptor
173 * Summary of information that has been read from the TX frame descriptor
174 * after the device is done with transmission.
176 * @control: Control structure which was used to transmit the frame.
177 * @status: TX status (See &enum tx_status).
178 * @retry: Retry count.
180 struct txdone_entry_desc {
181 struct ieee80211_tx_control *control;
187 * enum txentry_desc_flags: Status flags for TX entry descriptor
189 * @ENTRY_TXD_RTS_FRAME: This frame is a RTS frame.
190 * @ENTRY_TXD_OFDM_RATE: This frame is send out with an OFDM rate.
191 * @ENTRY_TXD_MORE_FRAG: This frame is followed by another fragment.
192 * @ENTRY_TXD_REQ_TIMESTAMP: Require timestamp to be inserted.
193 * @ENTRY_TXD_BURST: This frame belongs to the same burst event.
194 * @ENTRY_TXD_ACK: An ACK is required for this frame.
196 enum txentry_desc_flags {
200 ENTRY_TXD_REQ_TIMESTAMP,
206 * struct txentry_desc: TX Entry descriptor
208 * Summary of information for the frame descriptor before sending a TX frame.
210 * @flags: Descriptor flags (See &enum queue_entry_flags).
211 * @queue: Queue identification (See &enum data_queue_qid).
212 * @length_high: PLCP length high word.
213 * @length_low: PLCP length low word.
214 * @signal: PLCP signal.
215 * @service: PLCP service.
218 * @cw_min: cwmin value.
219 * @cw_max: cwmax value.
221 struct txentry_desc {
224 enum data_queue_qid queue;
238 * enum queue_entry_flags: Status flags for queue entry
240 * @ENTRY_BCN_ASSIGNED: This entry has been assigned to an interface.
241 * As long as this bit is set, this entry may only be touched
242 * through the interface structure.
243 * @ENTRY_OWNER_DEVICE_DATA: This entry is owned by the device for data
244 * transfer (either TX or RX depending on the queue). The entry should
245 * only be touched after the device has signaled it is done with it.
246 * @ENTRY_OWNER_DEVICE_CRYPTO: This entry is owned by the device for data
247 * encryption or decryption. The entry should only be touched after
248 * the device has signaled it is done with it.
250 enum queue_entry_flags {
252 ENTRY_OWNER_DEVICE_DATA,
253 ENTRY_OWNER_DEVICE_CRYPTO,
257 * struct queue_entry: Entry inside the &struct data_queue
259 * @flags: Entry flags, see &enum queue_entry_flags.
260 * @queue: The data queue (&struct data_queue) to which this entry belongs.
261 * @skb: The buffer which is currently being transmitted (for TX queue),
262 * or used to directly recieve data in (for RX queue).
263 * @entry_idx: The entry index number.
264 * @priv_data: Private data belonging to this queue entry. The pointer
265 * points to data specific to a particular driver and queue type.
270 struct data_queue *queue;
274 unsigned int entry_idx;
280 * enum queue_index: Queue index type
282 * @Q_INDEX: Index pointer to the current entry in the queue, if this entry is
283 * owned by the hardware then the queue is considered to be full.
284 * @Q_INDEX_DONE: Index pointer to the next entry which will be completed by
285 * the hardware and for which we need to run the txdone handler. If this
286 * entry is not owned by the hardware the queue is considered to be empty.
287 * @Q_INDEX_CRYPTO: Index pointer to the next entry which encryption/decription
288 * will be completed by the hardware next.
289 * @Q_INDEX_MAX: Keep last, used in &struct data_queue to determine the size
290 * of the index array.
300 * struct data_queue: Data queue
302 * @rt2x00dev: Pointer to main &struct rt2x00dev where this queue belongs to.
303 * @entries: Base address of the &struct queue_entry which are
304 * part of this queue.
305 * @qid: The queue identification, see &enum data_queue_qid.
306 * @lock: Spinlock to protect index handling. Whenever @index, @index_done or
307 * @index_crypt needs to be changed this lock should be grabbed to prevent
308 * index corruption due to concurrency.
309 * @count: Number of frames handled in the queue.
310 * @limit: Maximum number of entries in the queue.
311 * @length: Number of frames in queue.
312 * @index: Index pointers to entry positions in the queue,
313 * use &enum queue_index to get a specific index field.
314 * @aifs: The aifs value for outgoing frames (field ignored in RX queue).
315 * @cw_min: The cw min value for outgoing frames (field ignored in RX queue).
316 * @cw_max: The cw max value for outgoing frames (field ignored in RX queue).
317 * @data_size: Maximum data size for the frames in this queue.
318 * @desc_size: Hardware descriptor size for the data in this queue.
321 struct rt2x00_dev *rt2x00dev;
322 struct queue_entry *entries;
324 enum data_queue_qid qid;
328 unsigned short limit;
329 unsigned short length;
330 unsigned short index[Q_INDEX_MAX];
333 unsigned short cw_min;
334 unsigned short cw_max;
336 unsigned short data_size;
337 unsigned short desc_size;
341 * struct data_queue_desc: Data queue description
343 * The information in this structure is used by drivers
344 * to inform rt2x00lib about the creation of the data queue.
346 * @entry_num: Maximum number of entries for a queue.
347 * @data_size: Maximum data size for the frames in this queue.
348 * @desc_size: Hardware descriptor size for the data in this queue.
349 * @priv_size: Size of per-queue_entry private data.
351 struct data_queue_desc {
352 unsigned short entry_num;
353 unsigned short data_size;
354 unsigned short desc_size;
355 unsigned short priv_size;
359 * queue_end - Return pointer to the last queue (HELPER MACRO).
360 * @__dev: Pointer to &struct rt2x00_dev
362 * Using the base rx pointer and the maximum number of available queues,
363 * this macro will return the address of 1 position beyond the end of the
366 #define queue_end(__dev) \
367 &(__dev)->rx[(__dev)->data_queues]
370 * tx_queue_end - Return pointer to the last TX queue (HELPER MACRO).
371 * @__dev: Pointer to &struct rt2x00_dev
373 * Using the base tx pointer and the maximum number of available TX
374 * queues, this macro will return the address of 1 position beyond
375 * the end of the TX queue array.
377 #define tx_queue_end(__dev) \
378 &(__dev)->tx[(__dev)->hw->queues]
381 * queue_loop - Loop through the queues within a specific range (HELPER MACRO).
382 * @__entry: Pointer where the current queue entry will be stored in.
383 * @__start: Start queue pointer.
384 * @__end: End queue pointer.
386 * This macro will loop through all queues between &__start and &__end.
388 #define queue_loop(__entry, __start, __end) \
389 for ((__entry) = (__start); \
390 prefetch(&(__entry)[1]), (__entry) != (__end); \
391 (__entry) = &(__entry)[1])
394 * queue_for_each - Loop through all queues
395 * @__dev: Pointer to &struct rt2x00_dev
396 * @__entry: Pointer where the current queue entry will be stored in.
398 * This macro will loop through all available queues.
400 #define queue_for_each(__dev, __entry) \
401 queue_loop(__entry, (__dev)->rx, queue_end(__dev))
404 * tx_queue_for_each - Loop through the TX queues
405 * @__dev: Pointer to &struct rt2x00_dev
406 * @__entry: Pointer where the current queue entry will be stored in.
408 * This macro will loop through all TX related queues excluding
409 * the Beacon and Atim queues.
411 #define tx_queue_for_each(__dev, __entry) \
412 queue_loop(__entry, (__dev)->tx, tx_queue_end(__dev))
415 * txall_queue_for_each - Loop through all TX related queues
416 * @__dev: Pointer to &struct rt2x00_dev
417 * @__entry: Pointer where the current queue entry will be stored in.
419 * This macro will loop through all TX related queues including
420 * the Beacon and Atim queues.
422 #define txall_queue_for_each(__dev, __entry) \
423 queue_loop(__entry, (__dev)->tx, queue_end(__dev))
426 * rt2x00queue_empty - Check if the queue is empty.
427 * @queue: Queue to check if empty.
429 static inline int rt2x00queue_empty(struct data_queue *queue)
431 return queue->length == 0;
435 * rt2x00queue_full - Check if the queue is full.
436 * @queue: Queue to check if full.
438 static inline int rt2x00queue_full(struct data_queue *queue)
440 return queue->length == queue->limit;
444 * rt2x00queue_free - Check the number of available entries in queue.
445 * @queue: Queue to check.
447 static inline int rt2x00queue_available(struct data_queue *queue)
449 return queue->limit - queue->length;
453 * rt2x00_desc_read - Read a word from the hardware descriptor.
454 * @desc: Base descriptor address
455 * @word: Word index from where the descriptor should be read.
456 * @value: Address where the descriptor value should be written into.
458 static inline void rt2x00_desc_read(__le32 *desc, const u8 word, u32 *value)
460 *value = le32_to_cpu(desc[word]);
464 * rt2x00_desc_write - wrote a word to the hardware descriptor.
465 * @desc: Base descriptor address
466 * @word: Word index from where the descriptor should be written.
467 * @value: Value that should be written into the descriptor.
469 static inline void rt2x00_desc_write(__le32 *desc, const u8 word, u32 value)
471 desc[word] = cpu_to_le32(value);
474 #endif /* RT2X00QUEUE_H */