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.
50 * FIXME: For virtual interfaces we need a different number
51 * of beacons, since more interfaces require more beacons.
55 #define BEACON_ENTRIES 1
56 #define ATIM_ENTRIES 1
59 * enum data_queue_qid: Queue identification
73 * struct skb_frame_desc: Descriptor information for the skb buffer
75 * This structure is placed over the skb->cb array, this means that
76 * this structure should not exceed the size of that array (48 bytes).
78 * @flags: Frame flags.
79 * @frame_type: Frame type, see &enum rt2x00_dump_type.
80 * @data: Pointer to data part of frame (Start of ieee80211 header).
81 * @desc: Pointer to descriptor part of the frame.
82 * Note that this pointer could point to something outside
83 * of the scope of the skb->data pointer.
84 * @data_len: Length of the frame data.
85 * @desc_len: Length of the frame descriptor.
87 * @entry: The entry to which this sk buffer belongs.
89 struct skb_frame_desc {
92 unsigned int frame_type;
97 unsigned int data_len;
98 unsigned int desc_len;
100 struct queue_entry *entry;
103 static inline struct skb_frame_desc* get_skb_frame_desc(struct sk_buff *skb)
105 BUILD_BUG_ON(sizeof(struct skb_frame_desc) > sizeof(skb->cb));
106 return (struct skb_frame_desc *)&skb->cb[0];
110 * struct rxdone_entry_desc: RX Entry descriptor
112 * Summary of information that has been read from the RX frame descriptor.
114 * @signal: Signal of the received frame.
115 * @rssi: RSSI of the received frame.
116 * @ofdm: Was frame send with an OFDM rate.
117 * @size: Data size of the received frame.
118 * @flags: MAC80211 receive flags (See &enum mac80211_rx_flags).
119 * @my_bss: Does this frame originate from device's BSS.
121 struct rxdone_entry_desc {
131 * struct txdone_entry_desc: TX done entry descriptor
133 * Summary of information that has been read from the TX frame descriptor
134 * after the device is done with transmission.
136 * @control: Control structure which was used to transmit the frame.
137 * @status: TX status (See &enum tx_status).
138 * @retry: Retry count.
140 struct txdone_entry_desc {
141 struct ieee80211_tx_control *control;
147 * enum txentry_desc_flags: Status flags for TX entry descriptor
149 * @ENTRY_TXD_RTS_FRAME: This frame is a RTS frame.
150 * @ENTRY_TXD_OFDM_RATE: This frame is send out with an OFDM rate.
151 * @ENTRY_TXD_MORE_FRAG: This frame is followed by another fragment.
152 * @ENTRY_TXD_REQ_TIMESTAMP: Require timestamp to be inserted.
153 * @ENTRY_TXD_BURST: This frame belongs to the same burst event.
154 * @ENTRY_TXD_ACK: An ACK is required for this frame.
156 enum txentry_desc_flags {
160 ENTRY_TXD_REQ_TIMESTAMP,
166 * struct txentry_desc: TX Entry descriptor
168 * Summary of information for the frame descriptor before sending a TX frame.
170 * @flags: Descriptor flags (See &enum queue_entry_flags).
171 * @queue: Queue identification (See &enum data_queue_qid).
172 * @length_high: PLCP length high word.
173 * @length_low: PLCP length low word.
174 * @signal: PLCP signal.
175 * @service: PLCP service.
178 * @cw_min: cwmin value.
179 * @cw_max: cwmax value.
181 struct txentry_desc {
184 enum data_queue_qid queue;
198 * enum queue_entry_flags: Status flags for queue entry
200 * @ENTRY_BCN_ASSIGNED: This entry has been assigned to an interface.
201 * As long as this bit is set, this entry may only be touched
202 * through the interface structure.
203 * @ENTRY_OWNER_DEVICE_DATA: This entry is owned by the device for data
204 * transfer (either TX or RX depending on the queue). The entry should
205 * only be touched after the device has signaled it is done with it.
206 * @ENTRY_OWNER_DEVICE_CRYPTO: This entry is owned by the device for data
207 * encryption or decryption. The entry should only be touched after
208 * the device has signaled it is done with it.
211 enum queue_entry_flags {
213 ENTRY_OWNER_DEVICE_DATA,
214 ENTRY_OWNER_DEVICE_CRYPTO,
218 * struct queue_entry: Entry inside the &struct data_queue
220 * @flags: Entry flags, see &enum queue_entry_flags.
221 * @queue: The data queue (&struct data_queue) to which this entry belongs.
222 * @skb: The buffer which is currently being transmitted (for TX queue),
223 * or used to directly recieve data in (for RX queue).
224 * @entry_idx: The entry index number.
225 * @priv_data: Private data belonging to this queue entry. The pointer
226 * points to data specific to a particular driver and queue type.
231 struct data_queue *queue;
235 unsigned int entry_idx;
241 * enum queue_index: Queue index type
243 * @Q_INDEX: Index pointer to the current entry in the queue, if this entry is
244 * owned by the hardware then the queue is considered to be full.
245 * @Q_INDEX_DONE: Index pointer to the next entry which will be completed by
246 * the hardware and for which we need to run the txdone handler. If this
247 * entry is not owned by the hardware the queue is considered to be empty.
248 * @Q_INDEX_CRYPTO: Index pointer to the next entry which encryption/decription
249 * will be completed by the hardware next.
250 * @Q_INDEX_MAX: Keep last, used in &struct data_queue to determine the size
251 * of the index array.
261 * struct data_queue: Data queue
263 * @rt2x00dev: Pointer to main &struct rt2x00dev where this queue belongs to.
264 * @entries: Base address of the &struct queue_entry which are
265 * part of this queue.
266 * @qid: The queue identification, see &enum data_queue_qid.
267 * @lock: Spinlock to protect index handling. Whenever @index, @index_done or
268 * @index_crypt needs to be changed this lock should be grabbed to prevent
269 * index corruption due to concurrency.
270 * @count: Number of frames handled in the queue.
271 * @limit: Maximum number of entries in the queue.
272 * @length: Number of frames in queue.
273 * @index: Index pointers to entry positions in the queue,
274 * use &enum queue_index to get a specific index field.
275 * @aifs: The aifs value for outgoing frames (field ignored in RX queue).
276 * @cw_min: The cw min value for outgoing frames (field ignored in RX queue).
277 * @cw_max: The cw max value for outgoing frames (field ignored in RX queue).
278 * @data_size: Maximum data size for the frames in this queue.
279 * @desc_size: Hardware descriptor size for the data in this queue.
282 struct rt2x00_dev *rt2x00dev;
283 struct queue_entry *entries;
285 enum data_queue_qid qid;
289 unsigned short limit;
290 unsigned short length;
291 unsigned short index[Q_INDEX_MAX];
294 unsigned short cw_min;
295 unsigned short cw_max;
297 unsigned short data_size;
298 unsigned short desc_size;
302 * struct data_queue_desc: Data queue description
304 * The information in this structure is used by drivers
305 * to inform rt2x00lib about the creation of the data queue.
307 * @entry_num: Maximum number of entries for a queue.
308 * @data_size: Maximum data size for the frames in this queue.
309 * @desc_size: Hardware descriptor size for the data in this queue.
310 * @priv_size: Size of per-queue_entry private data.
312 struct data_queue_desc {
313 unsigned short entry_num;
314 unsigned short data_size;
315 unsigned short desc_size;
316 unsigned short priv_size;
320 * queue_end - Return pointer to the last queue (HELPER MACRO).
321 * @__dev: Pointer to &struct rt2x00_dev
323 * Using the base rx pointer and the maximum number of available queues,
324 * this macro will return the address of 1 position beyond the end of the
327 #define queue_end(__dev) \
328 &(__dev)->rx[(__dev)->data_queues]
331 * tx_queue_end - Return pointer to the last TX queue (HELPER MACRO).
332 * @__dev: Pointer to &struct rt2x00_dev
334 * Using the base tx pointer and the maximum number of available TX
335 * queues, this macro will return the address of 1 position beyond
336 * the end of the TX queue array.
338 #define tx_queue_end(__dev) \
339 &(__dev)->tx[(__dev)->hw->queues]
342 * queue_loop - Loop through the queues within a specific range (HELPER MACRO).
343 * @__entry: Pointer where the current queue entry will be stored in.
344 * @__start: Start queue pointer.
345 * @__end: End queue pointer.
347 * This macro will loop through all queues between &__start and &__end.
349 #define queue_loop(__entry, __start, __end) \
350 for ((__entry) = (__start); \
351 prefetch(&(__entry)[1]), (__entry) != (__end); \
352 (__entry) = &(__entry)[1])
355 * queue_for_each - Loop through all queues
356 * @__dev: Pointer to &struct rt2x00_dev
357 * @__entry: Pointer where the current queue entry will be stored in.
359 * This macro will loop through all available queues.
361 #define queue_for_each(__dev, __entry) \
362 queue_loop(__entry, (__dev)->rx, queue_end(__dev))
365 * tx_queue_for_each - Loop through the TX queues
366 * @__dev: Pointer to &struct rt2x00_dev
367 * @__entry: Pointer where the current queue entry will be stored in.
369 * This macro will loop through all TX related queues excluding
370 * the Beacon and Atim queues.
372 #define tx_queue_for_each(__dev, __entry) \
373 queue_loop(__entry, (__dev)->tx, tx_queue_end(__dev))
376 * txall_queue_for_each - Loop through all TX related queues
377 * @__dev: Pointer to &struct rt2x00_dev
378 * @__entry: Pointer where the current queue entry will be stored in.
380 * This macro will loop through all TX related queues including
381 * the Beacon and Atim queues.
383 #define txall_queue_for_each(__dev, __entry) \
384 queue_loop(__entry, (__dev)->tx, queue_end(__dev))
387 * rt2x00queue_empty - Check if the queue is empty.
388 * @queue: Queue to check if empty.
390 static inline int rt2x00queue_empty(struct data_queue *queue)
392 return queue->length == 0;
396 * rt2x00queue_full - Check if the queue is full.
397 * @queue: Queue to check if full.
399 static inline int rt2x00queue_full(struct data_queue *queue)
401 return queue->length == queue->limit;
405 * rt2x00queue_free - Check the number of available entries in queue.
406 * @queue: Queue to check.
408 static inline int rt2x00queue_available(struct data_queue *queue)
410 return queue->limit - queue->length;
414 * rt2x00_desc_read - Read a word from the hardware descriptor.
415 * @desc: Base descriptor address
416 * @word: Word index from where the descriptor should be read.
417 * @value: Address where the descriptor value should be written into.
419 static inline void rt2x00_desc_read(__le32 *desc, const u8 word, u32 *value)
421 *value = le32_to_cpu(desc[word]);
425 * rt2x00_desc_write - wrote a word to the hardware descriptor.
426 * @desc: Base descriptor address
427 * @word: Word index from where the descriptor should be written.
428 * @value: Value that should be written into the descriptor.
430 static inline void rt2x00_desc_write(__le32 *desc, const u8 word, u32 value)
432 desc[word] = cpu_to_le32(value);
435 #endif /* RT2X00QUEUE_H */