2 Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
3 <http://rt2x00.serialmonkey.com>
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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
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 */
89 if (queue < NUM_TX_DATA_QUEUES)
91 else if (queue == IEEE80211_TX_QUEUE_BEACON)
93 else if (queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
99 * enum skb_frame_desc_flags: Flags for &struct skb_frame_desc
101 * @FRAME_DESC_DRIVER_GENERATED: Frame was generated inside driver
102 * and should not be reported back to mac80211 during txdone.
104 enum skb_frame_desc_flags {
105 FRAME_DESC_DRIVER_GENERATED = 1 << 0,
109 * struct skb_frame_desc: Descriptor information for the skb buffer
111 * This structure is placed over the skb->cb array, this means that
112 * this structure should not exceed the size of that array (48 bytes).
114 * @flags: Frame flags, see &enum skb_frame_desc_flags.
115 * @frame_type: Frame type, see &enum rt2x00_dump_type.
116 * @data: Pointer to data part of frame (Start of ieee80211 header).
117 * @desc: Pointer to descriptor part of the frame.
118 * Note that this pointer could point to something outside
119 * of the scope of the skb->data pointer.
120 * @data_len: Length of the frame data.
121 * @desc_len: Length of the frame descriptor.
122 * @entry: The entry to which this sk buffer belongs.
124 struct skb_frame_desc {
127 unsigned int frame_type;
132 unsigned int data_len;
133 unsigned int desc_len;
135 struct queue_entry *entry;
138 static inline struct skb_frame_desc* get_skb_frame_desc(struct sk_buff *skb)
140 BUILD_BUG_ON(sizeof(struct skb_frame_desc) > sizeof(skb->cb));
141 return (struct skb_frame_desc *)&skb->cb[0];
145 * enum rxdone_entry_desc_flags: Flags for &struct rxdone_entry_desc
147 * @RXDONE_SIGNAL_PLCP: Does the signal field contain the plcp value,
148 * or does it contain the bitrate itself.
149 * @RXDONE_MY_BSS: Does this frame originate from device's BSS.
151 enum rxdone_entry_desc_flags {
152 RXDONE_SIGNAL_PLCP = 1 << 0,
153 RXDONE_MY_BSS = 1 << 1,
157 * struct rxdone_entry_desc: RX Entry descriptor
159 * Summary of information that has been read from the RX frame descriptor.
161 * @signal: Signal of the received frame.
162 * @rssi: RSSI of the received frame.
163 * @size: Data size of the received frame.
164 * @flags: MAC80211 receive flags (See &enum mac80211_rx_flags).
165 * @dev_flags: Ralink receive flags (See &enum rxdone_entry_desc_flags).
168 struct rxdone_entry_desc {
177 * struct txdone_entry_desc: TX done entry descriptor
179 * Summary of information that has been read from the TX frame descriptor
180 * after the device is done with transmission.
182 * @control: Control structure which was used to transmit the frame.
183 * @status: TX status (See &enum tx_status).
184 * @retry: Retry count.
186 struct txdone_entry_desc {
187 struct ieee80211_tx_control *control;
193 * enum txentry_desc_flags: Status flags for TX entry descriptor
195 * @ENTRY_TXD_RTS_FRAME: This frame is a RTS frame.
196 * @ENTRY_TXD_OFDM_RATE: This frame is send out with an OFDM rate.
197 * @ENTRY_TXD_MORE_FRAG: This frame is followed by another fragment.
198 * @ENTRY_TXD_REQ_TIMESTAMP: Require timestamp to be inserted.
199 * @ENTRY_TXD_BURST: This frame belongs to the same burst event.
200 * @ENTRY_TXD_ACK: An ACK is required for this frame.
202 enum txentry_desc_flags {
206 ENTRY_TXD_REQ_TIMESTAMP,
212 * struct txentry_desc: TX Entry descriptor
214 * Summary of information for the frame descriptor before sending a TX frame.
216 * @flags: Descriptor flags (See &enum queue_entry_flags).
217 * @queue: Queue identification (See &enum data_queue_qid).
218 * @length_high: PLCP length high word.
219 * @length_low: PLCP length low word.
220 * @signal: PLCP signal.
221 * @service: PLCP service.
224 * @cw_min: cwmin value.
225 * @cw_max: cwmax value.
227 struct txentry_desc {
230 enum data_queue_qid queue;
244 * enum queue_entry_flags: Status flags for queue entry
246 * @ENTRY_BCN_ASSIGNED: This entry has been assigned to an interface.
247 * As long as this bit is set, this entry may only be touched
248 * through the interface structure.
249 * @ENTRY_OWNER_DEVICE_DATA: This entry is owned by the device for data
250 * transfer (either TX or RX depending on the queue). The entry should
251 * only be touched after the device has signaled it is done with it.
252 * @ENTRY_OWNER_DEVICE_CRYPTO: This entry is owned by the device for data
253 * encryption or decryption. The entry should only be touched after
254 * the device has signaled it is done with it.
256 enum queue_entry_flags {
258 ENTRY_OWNER_DEVICE_DATA,
259 ENTRY_OWNER_DEVICE_CRYPTO,
263 * struct queue_entry: Entry inside the &struct data_queue
265 * @flags: Entry flags, see &enum queue_entry_flags.
266 * @queue: The data queue (&struct data_queue) to which this entry belongs.
267 * @skb: The buffer which is currently being transmitted (for TX queue),
268 * or used to directly recieve data in (for RX queue).
269 * @entry_idx: The entry index number.
270 * @priv_data: Private data belonging to this queue entry. The pointer
271 * points to data specific to a particular driver and queue type.
276 struct data_queue *queue;
280 unsigned int entry_idx;
286 * enum queue_index: Queue index type
288 * @Q_INDEX: Index pointer to the current entry in the queue, if this entry is
289 * owned by the hardware then the queue is considered to be full.
290 * @Q_INDEX_DONE: Index pointer to the next entry which will be completed by
291 * the hardware and for which we need to run the txdone handler. If this
292 * entry is not owned by the hardware the queue is considered to be empty.
293 * @Q_INDEX_CRYPTO: Index pointer to the next entry which encryption/decription
294 * will be completed by the hardware next.
295 * @Q_INDEX_MAX: Keep last, used in &struct data_queue to determine the size
296 * of the index array.
306 * struct data_queue: Data queue
308 * @rt2x00dev: Pointer to main &struct rt2x00dev where this queue belongs to.
309 * @entries: Base address of the &struct queue_entry which are
310 * part of this queue.
311 * @qid: The queue identification, see &enum data_queue_qid.
312 * @lock: Spinlock to protect index handling. Whenever @index, @index_done or
313 * @index_crypt needs to be changed this lock should be grabbed to prevent
314 * index corruption due to concurrency.
315 * @count: Number of frames handled in the queue.
316 * @limit: Maximum number of entries in the queue.
317 * @length: Number of frames in queue.
318 * @index: Index pointers to entry positions in the queue,
319 * use &enum queue_index to get a specific index field.
320 * @aifs: The aifs value for outgoing frames (field ignored in RX queue).
321 * @cw_min: The cw min value for outgoing frames (field ignored in RX queue).
322 * @cw_max: The cw max value for outgoing frames (field ignored in RX queue).
323 * @data_size: Maximum data size for the frames in this queue.
324 * @desc_size: Hardware descriptor size for the data in this queue.
327 struct rt2x00_dev *rt2x00dev;
328 struct queue_entry *entries;
330 enum data_queue_qid qid;
334 unsigned short limit;
335 unsigned short length;
336 unsigned short index[Q_INDEX_MAX];
339 unsigned short cw_min;
340 unsigned short cw_max;
342 unsigned short data_size;
343 unsigned short desc_size;
347 * struct data_queue_desc: Data queue description
349 * The information in this structure is used by drivers
350 * to inform rt2x00lib about the creation of the data queue.
352 * @entry_num: Maximum number of entries for a queue.
353 * @data_size: Maximum data size for the frames in this queue.
354 * @desc_size: Hardware descriptor size for the data in this queue.
355 * @priv_size: Size of per-queue_entry private data.
357 struct data_queue_desc {
358 unsigned short entry_num;
359 unsigned short data_size;
360 unsigned short desc_size;
361 unsigned short priv_size;
365 * queue_end - Return pointer to the last queue (HELPER MACRO).
366 * @__dev: Pointer to &struct rt2x00_dev
368 * Using the base rx pointer and the maximum number of available queues,
369 * this macro will return the address of 1 position beyond the end of the
372 #define queue_end(__dev) \
373 &(__dev)->rx[(__dev)->data_queues]
376 * tx_queue_end - Return pointer to the last TX queue (HELPER MACRO).
377 * @__dev: Pointer to &struct rt2x00_dev
379 * Using the base tx pointer and the maximum number of available TX
380 * queues, this macro will return the address of 1 position beyond
381 * the end of the TX queue array.
383 #define tx_queue_end(__dev) \
384 &(__dev)->tx[(__dev)->hw->queues]
387 * queue_loop - Loop through the queues within a specific range (HELPER MACRO).
388 * @__entry: Pointer where the current queue entry will be stored in.
389 * @__start: Start queue pointer.
390 * @__end: End queue pointer.
392 * This macro will loop through all queues between &__start and &__end.
394 #define queue_loop(__entry, __start, __end) \
395 for ((__entry) = (__start); \
396 prefetch(&(__entry)[1]), (__entry) != (__end); \
397 (__entry) = &(__entry)[1])
400 * queue_for_each - Loop through all queues
401 * @__dev: Pointer to &struct rt2x00_dev
402 * @__entry: Pointer where the current queue entry will be stored in.
404 * This macro will loop through all available queues.
406 #define queue_for_each(__dev, __entry) \
407 queue_loop(__entry, (__dev)->rx, queue_end(__dev))
410 * tx_queue_for_each - Loop through the TX queues
411 * @__dev: Pointer to &struct rt2x00_dev
412 * @__entry: Pointer where the current queue entry will be stored in.
414 * This macro will loop through all TX related queues excluding
415 * the Beacon and Atim queues.
417 #define tx_queue_for_each(__dev, __entry) \
418 queue_loop(__entry, (__dev)->tx, tx_queue_end(__dev))
421 * txall_queue_for_each - Loop through all TX related queues
422 * @__dev: Pointer to &struct rt2x00_dev
423 * @__entry: Pointer where the current queue entry will be stored in.
425 * This macro will loop through all TX related queues including
426 * the Beacon and Atim queues.
428 #define txall_queue_for_each(__dev, __entry) \
429 queue_loop(__entry, (__dev)->tx, queue_end(__dev))
432 * rt2x00queue_empty - Check if the queue is empty.
433 * @queue: Queue to check if empty.
435 static inline int rt2x00queue_empty(struct data_queue *queue)
437 return queue->length == 0;
441 * rt2x00queue_full - Check if the queue is full.
442 * @queue: Queue to check if full.
444 static inline int rt2x00queue_full(struct data_queue *queue)
446 return queue->length == queue->limit;
450 * rt2x00queue_free - Check the number of available entries in queue.
451 * @queue: Queue to check.
453 static inline int rt2x00queue_available(struct data_queue *queue)
455 return queue->limit - queue->length;
459 * rt2x00_desc_read - Read a word from the hardware descriptor.
460 * @desc: Base descriptor address
461 * @word: Word index from where the descriptor should be read.
462 * @value: Address where the descriptor value should be written into.
464 static inline void rt2x00_desc_read(__le32 *desc, const u8 word, u32 *value)
466 *value = le32_to_cpu(desc[word]);
470 * rt2x00_desc_write - wrote a word to the hardware descriptor.
471 * @desc: Base descriptor address
472 * @word: Word index from where the descriptor should be written.
473 * @value: Value that should be written into the descriptor.
475 static inline void rt2x00_desc_write(__le32 *desc, const u8 word, u32 value)
477 desc[word] = cpu_to_le32(value);
480 #endif /* RT2X00QUEUE_H */