2 Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
3 <http://rt2x00.serialmonkey.com>
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6 it under the terms of the GNU General Public License as published by
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
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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
70 * enum rt2x00_bcn_queue: Beacon queue index
72 * Start counting with a high offset, this because this enumeration
73 * supplements &enum ieee80211_tx_queue and we should prevent value
76 * @RT2X00_BCN_QUEUE_BEACON: Beacon queue
77 * @RT2X00_BCN_QUEUE_ATIM: Atim queue (sends frame after beacon)
79 enum rt2x00_bcn_queue {
80 RT2X00_BCN_QUEUE_BEACON = 100,
81 RT2X00_BCN_QUEUE_ATIM = 101,
85 * struct skb_frame_desc: Descriptor information for the skb buffer
87 * This structure is placed over the skb->cb array, this means that
88 * this structure should not exceed the size of that array (48 bytes).
90 * @flags: Frame flags.
91 * @frame_type: Frame type, see &enum rt2x00_dump_type.
92 * @data: Pointer to data part of frame (Start of ieee80211 header).
93 * @desc: Pointer to descriptor part of the frame.
94 * Note that this pointer could point to something outside
95 * of the scope of the skb->data pointer.
96 * @data_len: Length of the frame data.
97 * @desc_len: Length of the frame descriptor.
99 * @entry: The entry to which this sk buffer belongs.
101 struct skb_frame_desc {
104 unsigned int frame_type;
109 unsigned int data_len;
110 unsigned int desc_len;
112 struct queue_entry *entry;
115 static inline struct skb_frame_desc* get_skb_frame_desc(struct sk_buff *skb)
117 BUILD_BUG_ON(sizeof(struct skb_frame_desc) > sizeof(skb->cb));
118 return (struct skb_frame_desc *)&skb->cb[0];
122 * struct rxdone_entry_desc: RX Entry descriptor
124 * Summary of information that has been read from the RX frame descriptor.
126 * @signal: Signal of the received frame.
127 * @rssi: RSSI of the received frame.
128 * @ofdm: Was frame send with an OFDM rate.
129 * @size: Data size of the received frame.
130 * @flags: MAC80211 receive flags (See &enum mac80211_rx_flags).
131 * @my_bss: Does this frame originate from device's BSS.
133 struct rxdone_entry_desc {
143 * struct txdone_entry_desc: TX done entry descriptor
145 * Summary of information that has been read from the TX frame descriptor
146 * after the device is done with transmission.
148 * @control: Control structure which was used to transmit the frame.
149 * @status: TX status (See &enum tx_status).
150 * @retry: Retry count.
152 struct txdone_entry_desc {
153 struct ieee80211_tx_control *control;
159 * enum txentry_desc_flags: Status flags for TX entry descriptor
161 * @ENTRY_TXD_RTS_FRAME: This frame is a RTS frame.
162 * @ENTRY_TXD_OFDM_RATE: This frame is send out with an OFDM rate.
163 * @ENTRY_TXD_MORE_FRAG: This frame is followed by another fragment.
164 * @ENTRY_TXD_REQ_TIMESTAMP: Require timestamp to be inserted.
165 * @ENTRY_TXD_BURST: This frame belongs to the same burst event.
166 * @ENTRY_TXD_ACK: An ACK is required for this frame.
168 enum txentry_desc_flags {
172 ENTRY_TXD_REQ_TIMESTAMP,
178 * struct txentry_desc: TX Entry descriptor
180 * Summary of information for the frame descriptor before sending a TX frame.
182 * @flags: Descriptor flags (See &enum queue_entry_flags).
183 * @queue: Queue identification (See &enum data_queue_qid).
184 * @length_high: PLCP length high word.
185 * @length_low: PLCP length low word.
186 * @signal: PLCP signal.
187 * @service: PLCP service.
190 * @cw_min: cwmin value.
191 * @cw_max: cwmax value.
193 struct txentry_desc {
196 enum data_queue_qid queue;
210 * enum queue_entry_flags: Status flags for queue entry
212 * @ENTRY_BCN_ASSIGNED: This entry has been assigned to an interface.
213 * As long as this bit is set, this entry may only be touched
214 * through the interface structure.
215 * @ENTRY_OWNER_DEVICE_DATA: This entry is owned by the device for data
216 * transfer (either TX or RX depending on the queue). The entry should
217 * only be touched after the device has signaled it is done with it.
218 * @ENTRY_OWNER_DEVICE_CRYPTO: This entry is owned by the device for data
219 * encryption or decryption. The entry should only be touched after
220 * the device has signaled it is done with it.
223 enum queue_entry_flags {
225 ENTRY_OWNER_DEVICE_DATA,
226 ENTRY_OWNER_DEVICE_CRYPTO,
230 * struct queue_entry: Entry inside the &struct data_queue
232 * @flags: Entry flags, see &enum queue_entry_flags.
233 * @queue: The data queue (&struct data_queue) to which this entry belongs.
234 * @skb: The buffer which is currently being transmitted (for TX queue),
235 * or used to directly recieve data in (for RX queue).
236 * @entry_idx: The entry index number.
237 * @priv_data: Private data belonging to this queue entry. The pointer
238 * points to data specific to a particular driver and queue type.
243 struct data_queue *queue;
247 unsigned int entry_idx;
253 * enum queue_index: Queue index type
255 * @Q_INDEX: Index pointer to the current entry in the queue, if this entry is
256 * owned by the hardware then the queue is considered to be full.
257 * @Q_INDEX_DONE: Index pointer to the next entry which will be completed by
258 * the hardware and for which we need to run the txdone handler. If this
259 * entry is not owned by the hardware the queue is considered to be empty.
260 * @Q_INDEX_CRYPTO: Index pointer to the next entry which encryption/decription
261 * will be completed by the hardware next.
262 * @Q_INDEX_MAX: Keep last, used in &struct data_queue to determine the size
263 * of the index array.
273 * struct data_queue: Data queue
275 * @rt2x00dev: Pointer to main &struct rt2x00dev where this queue belongs to.
276 * @entries: Base address of the &struct queue_entry which are
277 * part of this queue.
278 * @qid: The queue identification, see &enum data_queue_qid.
279 * @lock: Spinlock to protect index handling. Whenever @index, @index_done or
280 * @index_crypt needs to be changed this lock should be grabbed to prevent
281 * index corruption due to concurrency.
282 * @count: Number of frames handled in the queue.
283 * @limit: Maximum number of entries in the queue.
284 * @length: Number of frames in queue.
285 * @index: Index pointers to entry positions in the queue,
286 * use &enum queue_index to get a specific index field.
287 * @aifs: The aifs value for outgoing frames (field ignored in RX queue).
288 * @cw_min: The cw min value for outgoing frames (field ignored in RX queue).
289 * @cw_max: The cw max value for outgoing frames (field ignored in RX queue).
290 * @data_size: Maximum data size for the frames in this queue.
291 * @desc_size: Hardware descriptor size for the data in this queue.
294 struct rt2x00_dev *rt2x00dev;
295 struct queue_entry *entries;
297 enum data_queue_qid qid;
301 unsigned short limit;
302 unsigned short length;
303 unsigned short index[Q_INDEX_MAX];
306 unsigned short cw_min;
307 unsigned short cw_max;
309 unsigned short data_size;
310 unsigned short desc_size;
314 * struct data_queue_desc: Data queue description
316 * The information in this structure is used by drivers
317 * to inform rt2x00lib about the creation of the data queue.
319 * @entry_num: Maximum number of entries for a queue.
320 * @data_size: Maximum data size for the frames in this queue.
321 * @desc_size: Hardware descriptor size for the data in this queue.
322 * @priv_size: Size of per-queue_entry private data.
324 struct data_queue_desc {
325 unsigned short entry_num;
326 unsigned short data_size;
327 unsigned short desc_size;
328 unsigned short priv_size;
332 * queue_end - Return pointer to the last queue (HELPER MACRO).
333 * @__dev: Pointer to &struct rt2x00_dev
335 * Using the base rx pointer and the maximum number of available queues,
336 * this macro will return the address of 1 position beyond the end of the
339 #define queue_end(__dev) \
340 &(__dev)->rx[(__dev)->data_queues]
343 * tx_queue_end - Return pointer to the last TX queue (HELPER MACRO).
344 * @__dev: Pointer to &struct rt2x00_dev
346 * Using the base tx pointer and the maximum number of available TX
347 * queues, this macro will return the address of 1 position beyond
348 * the end of the TX queue array.
350 #define tx_queue_end(__dev) \
351 &(__dev)->tx[(__dev)->hw->queues]
354 * queue_loop - Loop through the queues within a specific range (HELPER MACRO).
355 * @__entry: Pointer where the current queue entry will be stored in.
356 * @__start: Start queue pointer.
357 * @__end: End queue pointer.
359 * This macro will loop through all queues between &__start and &__end.
361 #define queue_loop(__entry, __start, __end) \
362 for ((__entry) = (__start); \
363 prefetch(&(__entry)[1]), (__entry) != (__end); \
364 (__entry) = &(__entry)[1])
367 * queue_for_each - Loop through all queues
368 * @__dev: Pointer to &struct rt2x00_dev
369 * @__entry: Pointer where the current queue entry will be stored in.
371 * This macro will loop through all available queues.
373 #define queue_for_each(__dev, __entry) \
374 queue_loop(__entry, (__dev)->rx, queue_end(__dev))
377 * tx_queue_for_each - Loop through the TX queues
378 * @__dev: Pointer to &struct rt2x00_dev
379 * @__entry: Pointer where the current queue entry will be stored in.
381 * This macro will loop through all TX related queues excluding
382 * the Beacon and Atim queues.
384 #define tx_queue_for_each(__dev, __entry) \
385 queue_loop(__entry, (__dev)->tx, tx_queue_end(__dev))
388 * txall_queue_for_each - Loop through all TX related queues
389 * @__dev: Pointer to &struct rt2x00_dev
390 * @__entry: Pointer where the current queue entry will be stored in.
392 * This macro will loop through all TX related queues including
393 * the Beacon and Atim queues.
395 #define txall_queue_for_each(__dev, __entry) \
396 queue_loop(__entry, (__dev)->tx, queue_end(__dev))
399 * rt2x00queue_empty - Check if the queue is empty.
400 * @queue: Queue to check if empty.
402 static inline int rt2x00queue_empty(struct data_queue *queue)
404 return queue->length == 0;
408 * rt2x00queue_full - Check if the queue is full.
409 * @queue: Queue to check if full.
411 static inline int rt2x00queue_full(struct data_queue *queue)
413 return queue->length == queue->limit;
417 * rt2x00queue_free - Check the number of available entries in queue.
418 * @queue: Queue to check.
420 static inline int rt2x00queue_available(struct data_queue *queue)
422 return queue->limit - queue->length;
426 * rt2x00_desc_read - Read a word from the hardware descriptor.
427 * @desc: Base descriptor address
428 * @word: Word index from where the descriptor should be read.
429 * @value: Address where the descriptor value should be written into.
431 static inline void rt2x00_desc_read(__le32 *desc, const u8 word, u32 *value)
433 *value = le32_to_cpu(desc[word]);
437 * rt2x00_desc_write - wrote a word to the hardware descriptor.
438 * @desc: Base descriptor address
439 * @word: Word index from where the descriptor should be written.
440 * @value: Value that should be written into the descriptor.
442 static inline void rt2x00_desc_write(__le32 *desc, const u8 word, u32 value)
444 desc[word] = cpu_to_le32(value);
447 #endif /* RT2X00QUEUE_H */