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181d6902 ID |
1 | /* |
2 | Copyright (C) 2004 - 2008 rt2x00 SourceForge Project | |
3 | <http://rt2x00.serialmonkey.com> | |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the | |
17 | Free Software Foundation, Inc., | |
18 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | */ | |
20 | ||
21 | /* | |
22 | Module: rt2x00 | |
23 | Abstract: rt2x00 queue datastructures and routines | |
24 | */ | |
25 | ||
26 | #ifndef RT2X00QUEUE_H | |
27 | #define RT2X00QUEUE_H | |
28 | ||
29 | #include <linux/prefetch.h> | |
30 | ||
31 | /** | |
32 | * DOC: Entrie frame size | |
33 | * | |
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. | |
38 | */ | |
39 | #define DATA_FRAME_SIZE 2432 | |
40 | #define MGMT_FRAME_SIZE 256 | |
41 | ||
42 | /** | |
43 | * DOC: Number of entries per queue | |
44 | * | |
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. | |
181d6902 ID |
49 | */ |
50 | #define RX_ENTRIES 12 | |
51 | #define TX_ENTRIES 12 | |
52 | #define BEACON_ENTRIES 1 | |
53 | #define ATIM_ENTRIES 1 | |
54 | ||
55 | /** | |
56 | * enum data_queue_qid: Queue identification | |
57 | */ | |
58 | enum data_queue_qid { | |
59 | QID_AC_BE = 0, | |
60 | QID_AC_BK = 1, | |
61 | QID_AC_VI = 2, | |
62 | QID_AC_VO = 3, | |
63 | QID_HCCA = 4, | |
64 | QID_MGMT = 13, | |
65 | QID_RX = 14, | |
66 | QID_OTHER = 15, | |
67 | }; | |
68 | ||
5957da4c ID |
69 | /** |
70 | * enum rt2x00_bcn_queue: Beacon queue index | |
71 | * | |
72 | * Start counting with a high offset, this because this enumeration | |
73 | * supplements &enum ieee80211_tx_queue and we should prevent value | |
74 | * conflicts. | |
75 | * | |
76 | * @RT2X00_BCN_QUEUE_BEACON: Beacon queue | |
77 | * @RT2X00_BCN_QUEUE_ATIM: Atim queue (sends frame after beacon) | |
78 | */ | |
79 | enum rt2x00_bcn_queue { | |
80 | RT2X00_BCN_QUEUE_BEACON = 100, | |
81 | RT2X00_BCN_QUEUE_ATIM = 101, | |
82 | }; | |
83 | ||
181d6902 ID |
84 | /** |
85 | * struct skb_frame_desc: Descriptor information for the skb buffer | |
86 | * | |
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). | |
89 | * | |
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. | |
98 | ||
99 | * @entry: The entry to which this sk buffer belongs. | |
100 | */ | |
101 | struct skb_frame_desc { | |
102 | unsigned int flags; | |
103 | ||
104 | unsigned int frame_type; | |
105 | ||
106 | void *data; | |
107 | void *desc; | |
108 | ||
109 | unsigned int data_len; | |
110 | unsigned int desc_len; | |
111 | ||
112 | struct queue_entry *entry; | |
113 | }; | |
114 | ||
115 | static inline struct skb_frame_desc* get_skb_frame_desc(struct sk_buff *skb) | |
116 | { | |
117 | BUILD_BUG_ON(sizeof(struct skb_frame_desc) > sizeof(skb->cb)); | |
118 | return (struct skb_frame_desc *)&skb->cb[0]; | |
119 | } | |
120 | ||
121 | /** | |
122 | * struct rxdone_entry_desc: RX Entry descriptor | |
123 | * | |
124 | * Summary of information that has been read from the RX frame descriptor. | |
125 | * | |
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. | |
132 | */ | |
133 | struct rxdone_entry_desc { | |
134 | int signal; | |
135 | int rssi; | |
136 | int ofdm; | |
137 | int size; | |
138 | int flags; | |
139 | int my_bss; | |
140 | }; | |
141 | ||
142 | /** | |
143 | * struct txdone_entry_desc: TX done entry descriptor | |
144 | * | |
145 | * Summary of information that has been read from the TX frame descriptor | |
146 | * after the device is done with transmission. | |
147 | * | |
148 | * @control: Control structure which was used to transmit the frame. | |
149 | * @status: TX status (See &enum tx_status). | |
150 | * @retry: Retry count. | |
151 | */ | |
152 | struct txdone_entry_desc { | |
153 | struct ieee80211_tx_control *control; | |
154 | int status; | |
155 | int retry; | |
156 | }; | |
157 | ||
158 | /** | |
159 | * enum txentry_desc_flags: Status flags for TX entry descriptor | |
160 | * | |
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. | |
167 | */ | |
168 | enum txentry_desc_flags { | |
169 | ENTRY_TXD_RTS_FRAME, | |
170 | ENTRY_TXD_OFDM_RATE, | |
171 | ENTRY_TXD_MORE_FRAG, | |
172 | ENTRY_TXD_REQ_TIMESTAMP, | |
173 | ENTRY_TXD_BURST, | |
174 | ENTRY_TXD_ACK, | |
175 | }; | |
176 | ||
177 | /** | |
178 | * struct txentry_desc: TX Entry descriptor | |
179 | * | |
180 | * Summary of information for the frame descriptor before sending a TX frame. | |
181 | * | |
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. | |
188 | * @aifs: AIFS value. | |
189 | * @ifs: IFS value. | |
190 | * @cw_min: cwmin value. | |
191 | * @cw_max: cwmax value. | |
192 | */ | |
193 | struct txentry_desc { | |
194 | unsigned long flags; | |
195 | ||
196 | enum data_queue_qid queue; | |
197 | ||
198 | u16 length_high; | |
199 | u16 length_low; | |
200 | u16 signal; | |
201 | u16 service; | |
202 | ||
203 | int aifs; | |
204 | int ifs; | |
205 | int cw_min; | |
206 | int cw_max; | |
207 | }; | |
208 | ||
209 | /** | |
210 | * enum queue_entry_flags: Status flags for queue entry | |
211 | * | |
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. | |
221 | */ | |
222 | ||
223 | enum queue_entry_flags { | |
224 | ENTRY_BCN_ASSIGNED, | |
225 | ENTRY_OWNER_DEVICE_DATA, | |
226 | ENTRY_OWNER_DEVICE_CRYPTO, | |
227 | }; | |
228 | ||
229 | /** | |
230 | * struct queue_entry: Entry inside the &struct data_queue | |
231 | * | |
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. | |
239 | */ | |
240 | struct queue_entry { | |
241 | unsigned long flags; | |
242 | ||
243 | struct data_queue *queue; | |
244 | ||
245 | struct sk_buff *skb; | |
246 | ||
247 | unsigned int entry_idx; | |
248 | ||
249 | void *priv_data; | |
250 | }; | |
251 | ||
252 | /** | |
253 | * enum queue_index: Queue index type | |
254 | * | |
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. | |
264 | */ | |
265 | enum queue_index { | |
266 | Q_INDEX, | |
267 | Q_INDEX_DONE, | |
268 | Q_INDEX_CRYPTO, | |
269 | Q_INDEX_MAX, | |
270 | }; | |
271 | ||
272 | /** | |
273 | * struct data_queue: Data queue | |
274 | * | |
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. | |
292 | */ | |
293 | struct data_queue { | |
294 | struct rt2x00_dev *rt2x00dev; | |
295 | struct queue_entry *entries; | |
296 | ||
297 | enum data_queue_qid qid; | |
298 | ||
299 | spinlock_t lock; | |
300 | unsigned int count; | |
301 | unsigned short limit; | |
302 | unsigned short length; | |
303 | unsigned short index[Q_INDEX_MAX]; | |
304 | ||
305 | unsigned short aifs; | |
306 | unsigned short cw_min; | |
307 | unsigned short cw_max; | |
308 | ||
309 | unsigned short data_size; | |
310 | unsigned short desc_size; | |
311 | }; | |
312 | ||
313 | /** | |
314 | * struct data_queue_desc: Data queue description | |
315 | * | |
316 | * The information in this structure is used by drivers | |
317 | * to inform rt2x00lib about the creation of the data queue. | |
318 | * | |
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. | |
323 | */ | |
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; | |
329 | }; | |
330 | ||
331 | /** | |
332 | * queue_end - Return pointer to the last queue (HELPER MACRO). | |
333 | * @__dev: Pointer to &struct rt2x00_dev | |
334 | * | |
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 | |
337 | * queues array. | |
338 | */ | |
339 | #define queue_end(__dev) \ | |
340 | &(__dev)->rx[(__dev)->data_queues] | |
341 | ||
342 | /** | |
343 | * tx_queue_end - Return pointer to the last TX queue (HELPER MACRO). | |
344 | * @__dev: Pointer to &struct rt2x00_dev | |
345 | * | |
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. | |
349 | */ | |
350 | #define tx_queue_end(__dev) \ | |
351 | &(__dev)->tx[(__dev)->hw->queues] | |
352 | ||
353 | /** | |
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. | |
358 | * | |
359 | * This macro will loop through all queues between &__start and &__end. | |
360 | */ | |
361 | #define queue_loop(__entry, __start, __end) \ | |
362 | for ((__entry) = (__start); \ | |
363 | prefetch(&(__entry)[1]), (__entry) != (__end); \ | |
364 | (__entry) = &(__entry)[1]) | |
365 | ||
366 | /** | |
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. | |
370 | * | |
371 | * This macro will loop through all available queues. | |
372 | */ | |
373 | #define queue_for_each(__dev, __entry) \ | |
374 | queue_loop(__entry, (__dev)->rx, queue_end(__dev)) | |
375 | ||
376 | /** | |
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. | |
380 | * | |
381 | * This macro will loop through all TX related queues excluding | |
382 | * the Beacon and Atim queues. | |
383 | */ | |
384 | #define tx_queue_for_each(__dev, __entry) \ | |
385 | queue_loop(__entry, (__dev)->tx, tx_queue_end(__dev)) | |
386 | ||
387 | /** | |
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. | |
391 | * | |
392 | * This macro will loop through all TX related queues including | |
393 | * the Beacon and Atim queues. | |
394 | */ | |
395 | #define txall_queue_for_each(__dev, __entry) \ | |
396 | queue_loop(__entry, (__dev)->tx, queue_end(__dev)) | |
397 | ||
398 | /** | |
399 | * rt2x00queue_empty - Check if the queue is empty. | |
400 | * @queue: Queue to check if empty. | |
401 | */ | |
402 | static inline int rt2x00queue_empty(struct data_queue *queue) | |
403 | { | |
404 | return queue->length == 0; | |
405 | } | |
406 | ||
407 | /** | |
408 | * rt2x00queue_full - Check if the queue is full. | |
409 | * @queue: Queue to check if full. | |
410 | */ | |
411 | static inline int rt2x00queue_full(struct data_queue *queue) | |
412 | { | |
413 | return queue->length == queue->limit; | |
414 | } | |
415 | ||
416 | /** | |
417 | * rt2x00queue_free - Check the number of available entries in queue. | |
418 | * @queue: Queue to check. | |
419 | */ | |
420 | static inline int rt2x00queue_available(struct data_queue *queue) | |
421 | { | |
422 | return queue->limit - queue->length; | |
423 | } | |
424 | ||
425 | /** | |
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. | |
430 | */ | |
431 | static inline void rt2x00_desc_read(__le32 *desc, const u8 word, u32 *value) | |
432 | { | |
433 | *value = le32_to_cpu(desc[word]); | |
434 | } | |
435 | ||
436 | /** | |
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. | |
441 | */ | |
442 | static inline void rt2x00_desc_write(__le32 *desc, const u8 word, u32 value) | |
443 | { | |
444 | desc[word] = cpu_to_le32(value); | |
445 | } | |
446 | ||
447 | #endif /* RT2X00QUEUE_H */ |