drivers/net/wireless/rt2x00/rt2x00queue.h

   1 /*
   2         Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
   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: Entry 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  * The aggregation size depends on support from the driver, but should
  39  * be something around 3840 bytes.
  40  */
  41 #define DATA_FRAME_SIZE         2432
  42 #define MGMT_FRAME_SIZE         256
  43 #define AGGREGATION_SIZE        3840
  44
  45 /**
  46  * enum data_queue_qid: Queue identification
  47  *
  48  * @QID_AC_VO: AC VO queue
  49  * @QID_AC_VI: AC VI queue
  50  * @QID_AC_BE: AC BE queue
  51  * @QID_AC_BK: AC BK queue
  52  * @QID_HCCA: HCCA queue
  53  * @QID_MGMT: MGMT queue (prio queue)
  54  * @QID_RX: RX queue
  55  * @QID_OTHER: None of the above (don't use, only present for completeness)
  56  * @QID_BEACON: Beacon queue (value unspecified, don't send it to device)
  57  * @QID_ATIM: Atim queue (value unspeficied, don't send it to device)
  58  */
  59 enum data_queue_qid {
  60         QID_AC_VO = 0,
  61         QID_AC_VI = 1,
  62         QID_AC_BE = 2,
  63         QID_AC_BK = 3,
  64         QID_HCCA = 4,
  65         QID_MGMT = 13,
  66         QID_RX = 14,
  67         QID_OTHER = 15,
  68         QID_BEACON,
  69         QID_ATIM,
  70 };
  71
  72 /**
  73  * enum skb_frame_desc_flags: Flags for &struct skb_frame_desc
  74  *
  75  * @SKBDESC_DMA_MAPPED_RX: &skb_dma field has been mapped for RX
  76  * @SKBDESC_DMA_MAPPED_TX: &skb_dma field has been mapped for TX
  77  * @SKBDESC_IV_STRIPPED: Frame contained a IV/EIV provided by
  78  *      mac80211 but was stripped for processing by the driver.
  79  * @SKBDESC_NOT_MAC80211: Frame didn't originate from mac80211,
  80  *      don't try to pass it back.
  81  * @SKBDESC_DESC_IN_SKB: The descriptor is at the start of the
  82  *      skb, instead of in the desc field.
  83  */
  84 enum skb_frame_desc_flags {
  85         SKBDESC_DMA_MAPPED_RX = 1 << 0,
  86         SKBDESC_DMA_MAPPED_TX = 1 << 1,
  87         SKBDESC_IV_STRIPPED = 1 << 2,
  88         SKBDESC_NOT_MAC80211 = 1 << 3,
  89         SKBDESC_DESC_IN_SKB = 1 << 4,
  90 };
  91
  92 /**
  93  * struct skb_frame_desc: Descriptor information for the skb buffer
  94  *
  95  * This structure is placed over the driver_data array, this means that
  96  * this structure should not exceed the size of that array (40 bytes).
  97  *
  98  * @flags: Frame flags, see &enum skb_frame_desc_flags.
  99  * @desc_len: Length of the frame descriptor.
 100  * @tx_rate_idx: the index of the TX rate, used for TX status reporting
 101  * @tx_rate_flags: the TX rate flags, used for TX status reporting
 102  * @desc: Pointer to descriptor part of the frame.
 103  *      Note that this pointer could point to something outside
 104  *      of the scope of the skb->data pointer.
 105  * @iv: IV/EIV data used during encryption/decryption.
 106  * @skb_dma: (PCI-only) the DMA address associated with the sk buffer.
 107  * @entry: The entry to which this sk buffer belongs.
 108  */
 109 struct skb_frame_desc {
 110         u8 flags;
 111
 112         u8 desc_len;
 113         u8 tx_rate_idx;
 114         u8 tx_rate_flags;
 115
 116         void *desc;
 117
 118         __le32 iv[2];
 119
 120         dma_addr_t skb_dma;
 121
 122         struct queue_entry *entry;
 123 };
 124
 125 /**
 126  * get_skb_frame_desc - Obtain the rt2x00 frame descriptor from a sk_buff.
 127  * @skb: &struct sk_buff from where we obtain the &struct skb_frame_desc
 128  */
 129 static inline struct skb_frame_desc* get_skb_frame_desc(struct sk_buff *skb)
 130 {
 131         BUILD_BUG_ON(sizeof(struct skb_frame_desc) >
 132                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE);
 133         return (struct skb_frame_desc *)&IEEE80211_SKB_CB(skb)->driver_data;
 134 }
 135
 136 /**
 137  * enum rxdone_entry_desc_flags: Flags for &struct rxdone_entry_desc
 138  *
 139  * @RXDONE_SIGNAL_PLCP: Signal field contains the plcp value.
 140  * @RXDONE_SIGNAL_BITRATE: Signal field contains the bitrate value.
 141  * @RXDONE_SIGNAL_MCS: Signal field contains the mcs value.
 142  * @RXDONE_MY_BSS: Does this frame originate from device's BSS.
 143  * @RXDONE_CRYPTO_IV: Driver provided IV/EIV data.
 144  * @RXDONE_CRYPTO_ICV: Driver provided ICV data.
 145  * @RXDONE_L2PAD: 802.11 payload has been padded to 4-byte boundary.
 146  */
 147 enum rxdone_entry_desc_flags {
 148         RXDONE_SIGNAL_PLCP = BIT(0),
 149         RXDONE_SIGNAL_BITRATE = BIT(1),
 150         RXDONE_SIGNAL_MCS = BIT(2),
 151         RXDONE_MY_BSS = BIT(3),
 152         RXDONE_CRYPTO_IV = BIT(4),
 153         RXDONE_CRYPTO_ICV = BIT(5),
 154         RXDONE_L2PAD = BIT(6),
 155 };
 156
 157 /**
 158  * RXDONE_SIGNAL_MASK - Define to mask off all &rxdone_entry_desc_flags flags
 159  * except for the RXDONE_SIGNAL_* flags. This is useful to convert the dev_flags
 160  * from &rxdone_entry_desc to a signal value type.
 161  */
 162 #define RXDONE_SIGNAL_MASK \
 163         ( RXDONE_SIGNAL_PLCP | RXDONE_SIGNAL_BITRATE | RXDONE_SIGNAL_MCS )
 164
 165 /**
 166  * struct rxdone_entry_desc: RX Entry descriptor
 167  *
 168  * Summary of information that has been read from the RX frame descriptor.
 169  *
 170  * @timestamp: RX Timestamp
 171  * @signal: Signal of the received frame.
 172  * @rssi: RSSI of the received frame.
 173  * @size: Data size of the received frame.
 174  * @flags: MAC80211 receive flags (See &enum mac80211_rx_flags).
 175  * @dev_flags: Ralink receive flags (See &enum rxdone_entry_desc_flags).
 176  * @rate_mode: Rate mode (See @enum rate_modulation).
 177  * @cipher: Cipher type used during decryption.
 178  * @cipher_status: Decryption status.
 179  * @iv: IV/EIV data used during decryption.
 180  * @icv: ICV data used during decryption.
 181  */
 182 struct rxdone_entry_desc {
 183         u64 timestamp;
 184         int signal;
 185         int rssi;
 186         int size;
 187         int flags;
 188         int dev_flags;
 189         u16 rate_mode;
 190         u8 cipher;
 191         u8 cipher_status;
 192
 193         __le32 iv[2];
 194         __le32 icv;
 195 };
 196
 197 /**
 198  * enum txdone_entry_desc_flags: Flags for &struct txdone_entry_desc
 199  *
 200  * Every txdone report has to contain the basic result of the
 201  * transmission, either &TXDONE_UNKNOWN, &TXDONE_SUCCESS or
 202  * &TXDONE_FAILURE. The flag &TXDONE_FALLBACK can be used in
 203  * conjunction with all of these flags but should only be set
 204  * if retires > 0. The flag &TXDONE_EXCESSIVE_RETRY can only be used
 205  * in conjunction with &TXDONE_FAILURE.
 206  *
 207  * @TXDONE_UNKNOWN: Hardware could not determine success of transmission.
 208  * @TXDONE_SUCCESS: Frame was successfully send
 209  * @TXDONE_FALLBACK: Hardware used fallback rates for retries
 210  * @TXDONE_FAILURE: Frame was not successfully send
 211  * @TXDONE_EXCESSIVE_RETRY: In addition to &TXDONE_FAILURE, the
 212  *      frame transmission failed due to excessive retries.
 213  */
 214 enum txdone_entry_desc_flags {
 215         TXDONE_UNKNOWN,
 216         TXDONE_SUCCESS,
 217         TXDONE_FALLBACK,
 218         TXDONE_FAILURE,
 219         TXDONE_EXCESSIVE_RETRY,
 220 };
 221
 222 /**
 223  * struct txdone_entry_desc: TX done entry descriptor
 224  *
 225  * Summary of information that has been read from the TX frame descriptor
 226  * after the device is done with transmission.
 227  *
 228  * @flags: TX done flags (See &enum txdone_entry_desc_flags).
 229  * @retry: Retry count.
 230  */
 231 struct txdone_entry_desc {
 232         unsigned long flags;
 233         int retry;
 234 };
 235
 236 /**
 237  * enum txentry_desc_flags: Status flags for TX entry descriptor
 238  *
 239  * @ENTRY_TXD_RTS_FRAME: This frame is a RTS frame.
 240  * @ENTRY_TXD_CTS_FRAME: This frame is a CTS-to-self frame.
 241  * @ENTRY_TXD_GENERATE_SEQ: This frame requires sequence counter.
 242  * @ENTRY_TXD_FIRST_FRAGMENT: This is the first frame.
 243  * @ENTRY_TXD_MORE_FRAG: This frame is followed by another fragment.
 244  * @ENTRY_TXD_REQ_TIMESTAMP: Require timestamp to be inserted.
 245  * @ENTRY_TXD_BURST: This frame belongs to the same burst event.
 246  * @ENTRY_TXD_ACK: An ACK is required for this frame.
 247  * @ENTRY_TXD_RETRY_MODE: When set, the long retry count is used.
 248  * @ENTRY_TXD_ENCRYPT: This frame should be encrypted.
 249  * @ENTRY_TXD_ENCRYPT_PAIRWISE: Use pairwise key table (instead of shared).
 250  * @ENTRY_TXD_ENCRYPT_IV: Generate IV/EIV in hardware.
 251  * @ENTRY_TXD_ENCRYPT_MMIC: Generate MIC in hardware.
 252  * @ENTRY_TXD_HT_AMPDU: This frame is part of an AMPDU.
 253  * @ENTRY_TXD_HT_BW_40: Use 40MHz Bandwidth.
 254  * @ENTRY_TXD_HT_SHORT_GI: Use short GI.
 255  * @ENTRY_TXD_HT_MIMO_PS: The receiving STA is in dynamic SM PS mode.
 256  */
 257 enum txentry_desc_flags {
 258         ENTRY_TXD_RTS_FRAME,
 259         ENTRY_TXD_CTS_FRAME,
 260         ENTRY_TXD_GENERATE_SEQ,
 261         ENTRY_TXD_FIRST_FRAGMENT,
 262         ENTRY_TXD_MORE_FRAG,
 263         ENTRY_TXD_REQ_TIMESTAMP,
 264         ENTRY_TXD_BURST,
 265         ENTRY_TXD_ACK,
 266         ENTRY_TXD_RETRY_MODE,
 267         ENTRY_TXD_ENCRYPT,
 268         ENTRY_TXD_ENCRYPT_PAIRWISE,
 269         ENTRY_TXD_ENCRYPT_IV,
 270         ENTRY_TXD_ENCRYPT_MMIC,
 271         ENTRY_TXD_HT_AMPDU,
 272         ENTRY_TXD_HT_BW_40,
 273         ENTRY_TXD_HT_SHORT_GI,
 274         ENTRY_TXD_HT_MIMO_PS,
 275 };
 276
 277 /**
 278  * struct txentry_desc: TX Entry descriptor
 279  *
 280  * Summary of information for the frame descriptor before sending a TX frame.
 281  *
 282  * @flags: Descriptor flags (See &enum queue_entry_flags).
 283  * @length: Length of the entire frame.
 284  * @header_length: Length of 802.11 header.
 285  * @length_high: PLCP length high word.
 286  * @length_low: PLCP length low word.
 287  * @signal: PLCP signal.
 288  * @service: PLCP service.
 289  * @msc: MCS.
 290  * @stbc: STBC.
 291  * @ba_size: BA size.
 292  * @rate_mode: Rate mode (See @enum rate_modulation).
 293  * @mpdu_density: MDPU density.
 294  * @retry_limit: Max number of retries.
 295  * @ifs: IFS value.
 296  * @txop: IFS value for 11n capable chips.
 297  * @cipher: Cipher type used for encryption.
 298  * @key_idx: Key index used for encryption.
 299  * @iv_offset: Position where IV should be inserted by hardware.
 300  * @iv_len: Length of IV data.
 301  */
 302 struct txentry_desc {
 303         unsigned long flags;
 304
 305         u16 length;
 306         u16 header_length;
 307
 308         u16 length_high;
 309         u16 length_low;
 310         u16 signal;
 311         u16 service;
 312
 313         u16 mcs;
 314         u16 stbc;
 315         u16 ba_size;
 316         u16 rate_mode;
 317         u16 mpdu_density;
 318
 319         short retry_limit;
 320         short ifs;
 321         short txop;
 322
 323         enum cipher cipher;
 324         u16 key_idx;
 325         u16 iv_offset;
 326         u16 iv_len;
 327 };
 328
 329 /**
 330  * enum queue_entry_flags: Status flags for queue entry
 331  *
 332  * @ENTRY_BCN_ASSIGNED: This entry has been assigned to an interface.
 333  *      As long as this bit is set, this entry may only be touched
 334  *      through the interface structure.
 335  * @ENTRY_OWNER_DEVICE_DATA: This entry is owned by the device for data
 336  *      transfer (either TX or RX depending on the queue). The entry should
 337  *      only be touched after the device has signaled it is done with it.
 338  * @ENTRY_DATA_PENDING: This entry contains a valid frame and is waiting
 339  *      for the signal to start sending.
 340  * @ENTRY_DATA_IO_FAILED: Hardware indicated that an IO error occured
 341  *      while transfering the data to the hardware. No TX status report will
 342  *      be expected from the hardware.
 343  * @ENTRY_DATA_STATUS_PENDING: The entry has been send to the device and
 344  *      returned. It is now waiting for the status reporting before the
 345  *      entry can be reused again.
 346  */
 347 enum queue_entry_flags {
 348         ENTRY_BCN_ASSIGNED,
 349         ENTRY_OWNER_DEVICE_DATA,
 350         ENTRY_DATA_PENDING,
 351         ENTRY_DATA_IO_FAILED,
 352         ENTRY_DATA_STATUS_PENDING,
 353 };
 354
 355 /**
 356  * struct queue_entry: Entry inside the &struct data_queue
 357  *
 358  * @flags: Entry flags, see &enum queue_entry_flags.
 359  * @queue: The data queue (&struct data_queue) to which this entry belongs.
 360  * @skb: The buffer which is currently being transmitted (for TX queue),
 361  *      or used to directly recieve data in (for RX queue).
 362  * @entry_idx: The entry index number.
 363  * @priv_data: Private data belonging to this queue entry. The pointer
 364  *      points to data specific to a particular driver and queue type.
 365  */
 366 struct queue_entry {
 367         unsigned long flags;
 368
 369         struct data_queue *queue;
 370
 371         struct sk_buff *skb;
 372
 373         unsigned int entry_idx;
 374
 375         void *priv_data;
 376 };
 377
 378 /**
 379  * enum queue_index: Queue index type
 380  *
 381  * @Q_INDEX: Index pointer to the current entry in the queue, if this entry is
 382  *      owned by the hardware then the queue is considered to be full.
 383  * @Q_INDEX_DMA_DONE: Index pointer for the next entry which will have been
 384  *      transfered to the hardware.
 385  * @Q_INDEX_DONE: Index pointer to the next entry which will be completed by
 386  *      the hardware and for which we need to run the txdone handler. If this
 387  *      entry is not owned by the hardware the queue is considered to be empty.
 388  * @Q_INDEX_MAX: Keep last, used in &struct data_queue to determine the size
 389  *      of the index array.
 390  */
 391 enum queue_index {
 392         Q_INDEX,
 393         Q_INDEX_DMA_DONE,
 394         Q_INDEX_DONE,
 395         Q_INDEX_MAX,
 396 };
 397
 398 /**
 399  * enum data_queue_flags: Status flags for data queues
 400  *
 401  * @QUEUE_STARTED: The queue has been started. Fox RX queues this means the
 402  *      device might be DMA'ing skbuffers. TX queues will accept skbuffers to
 403  *      be transmitted and beacon queues will start beaconing the configured
 404  *      beacons.
 405  * @QUEUE_PAUSED: The queue has been started but is currently paused.
 406  *      When this bit is set, the queue has been stopped in mac80211,
 407  *      preventing new frames to be enqueued. However, a few frames
 408  *      might still appear shortly after the pausing...
 409  */
 410 enum data_queue_flags {
 411         QUEUE_STARTED,
 412         QUEUE_PAUSED,
 413 };
 414
 415 /**
 416  * struct data_queue: Data queue
 417  *
 418  * @rt2x00dev: Pointer to main &struct rt2x00dev where this queue belongs to.
 419  * @entries: Base address of the &struct queue_entry which are
 420  *      part of this queue.
 421  * @qid: The queue identification, see &enum data_queue_qid.
 422  * @flags: Entry flags, see &enum queue_entry_flags.
 423  * @status_lock: The mutex for protecting the start/stop/flush
 424  *      handling on this queue.
 425  * @index_lock: Spinlock to protect index handling. Whenever @index, @index_done or
 426  *      @index_crypt needs to be changed this lock should be grabbed to prevent
 427  *      index corruption due to concurrency.
 428  * @count: Number of frames handled in the queue.
 429  * @limit: Maximum number of entries in the queue.
 430  * @threshold: Minimum number of free entries before queue is kicked by force.
 431  * @length: Number of frames in queue.
 432  * @index: Index pointers to entry positions in the queue,
 433  *      use &enum queue_index to get a specific index field.
 434  * @txop: maximum burst time.
 435  * @aifs: The aifs value for outgoing frames (field ignored in RX queue).
 436  * @cw_min: The cw min value for outgoing frames (field ignored in RX queue).
 437  * @cw_max: The cw max value for outgoing frames (field ignored in RX queue).
 438  * @data_size: Maximum data size for the frames in this queue.
 439  * @desc_size: Hardware descriptor size for the data in this queue.
 440  * @usb_endpoint: Device endpoint used for communication (USB only)
 441  * @usb_maxpacket: Max packet size for given endpoint (USB only)
 442  */
 443 struct data_queue {
 444         struct rt2x00_dev *rt2x00dev;
 445         struct queue_entry *entries;
 446
 447         enum data_queue_qid qid;
 448         unsigned long flags;
 449
 450         struct mutex status_lock;
 451         spinlock_t index_lock;
 452
 453         unsigned int count;
 454         unsigned short limit;
 455         unsigned short threshold;
 456         unsigned short length;
 457         unsigned short index[Q_INDEX_MAX];
 458         unsigned long last_action[Q_INDEX_MAX];
 459
 460         unsigned short txop;
 461         unsigned short aifs;
 462         unsigned short cw_min;
 463         unsigned short cw_max;
 464
 465         unsigned short data_size;
 466         unsigned short desc_size;
 467
 468         unsigned short usb_endpoint;
 469         unsigned short usb_maxpacket;
 470 };
 471
 472 /**
 473  * struct data_queue_desc: Data queue description
 474  *
 475  * The information in this structure is used by drivers
 476  * to inform rt2x00lib about the creation of the data queue.
 477  *
 478  * @entry_num: Maximum number of entries for a queue.
 479  * @data_size: Maximum data size for the frames in this queue.
 480  * @desc_size: Hardware descriptor size for the data in this queue.
 481  * @priv_size: Size of per-queue_entry private data.
 482  */
 483 struct data_queue_desc {
 484         unsigned short entry_num;
 485         unsigned short data_size;
 486         unsigned short desc_size;
 487         unsigned short priv_size;
 488 };
 489
 490 /**
 491  * queue_end - Return pointer to the last queue (HELPER MACRO).
 492  * @__dev: Pointer to &struct rt2x00_dev
 493  *
 494  * Using the base rx pointer and the maximum number of available queues,
 495  * this macro will return the address of 1 position beyond  the end of the
 496  * queues array.
 497  */
 498 #define queue_end(__dev) \
 499         &(__dev)->rx[(__dev)->data_queues]
 500
 501 /**
 502  * tx_queue_end - Return pointer to the last TX queue (HELPER MACRO).
 503  * @__dev: Pointer to &struct rt2x00_dev
 504  *
 505  * Using the base tx pointer and the maximum number of available TX
 506  * queues, this macro will return the address of 1 position beyond
 507  * the end of the TX queue array.
 508  */
 509 #define tx_queue_end(__dev) \
 510         &(__dev)->tx[(__dev)->ops->tx_queues]
 511
 512 /**
 513  * queue_next - Return pointer to next queue in list (HELPER MACRO).
 514  * @__queue: Current queue for which we need the next queue
 515  *
 516  * Using the current queue address we take the address directly
 517  * after the queue to take the next queue. Note that this macro
 518  * should be used carefully since it does not protect against
 519  * moving past the end of the list. (See macros &queue_end and
 520  * &tx_queue_end for determining the end of the queue).
 521  */
 522 #define queue_next(__queue) \
 523         &(__queue)[1]
 524
 525 /**
 526  * queue_loop - Loop through the queues within a specific range (HELPER MACRO).
 527  * @__entry: Pointer where the current queue entry will be stored in.
 528  * @__start: Start queue pointer.
 529  * @__end: End queue pointer.
 530  *
 531  * This macro will loop through all queues between &__start and &__end.
 532  */
 533 #define queue_loop(__entry, __start, __end)                     \
 534         for ((__entry) = (__start);                             \
 535              prefetch(queue_next(__entry)), (__entry) != (__end);\
 536              (__entry) = queue_next(__entry))
 537
 538 /**
 539  * queue_for_each - Loop through all queues
 540  * @__dev: Pointer to &struct rt2x00_dev
 541  * @__entry: Pointer where the current queue entry will be stored in.
 542  *
 543  * This macro will loop through all available queues.
 544  */
 545 #define queue_for_each(__dev, __entry) \
 546         queue_loop(__entry, (__dev)->rx, queue_end(__dev))
 547
 548 /**
 549  * tx_queue_for_each - Loop through the TX queues
 550  * @__dev: Pointer to &struct rt2x00_dev
 551  * @__entry: Pointer where the current queue entry will be stored in.
 552  *
 553  * This macro will loop through all TX related queues excluding
 554  * the Beacon and Atim queues.
 555  */
 556 #define tx_queue_for_each(__dev, __entry) \
 557         queue_loop(__entry, (__dev)->tx, tx_queue_end(__dev))
 558
 559 /**
 560  * txall_queue_for_each - Loop through all TX related queues
 561  * @__dev: Pointer to &struct rt2x00_dev
 562  * @__entry: Pointer where the current queue entry will be stored in.
 563  *
 564  * This macro will loop through all TX related queues including
 565  * the Beacon and Atim queues.
 566  */
 567 #define txall_queue_for_each(__dev, __entry) \
 568         queue_loop(__entry, (__dev)->tx, queue_end(__dev))
 569
 570 /**
 571  * rt2x00queue_for_each_entry - Loop through all entries in the queue
 572  * @queue: Pointer to @data_queue
 573  * @start: &enum queue_index Pointer to start index
 574  * @end: &enum queue_index Pointer to end index
 575  * @fn: The function to call for each &struct queue_entry
 576  *
 577  * This will walk through all entries in the queue, in chronological
 578  * order. This means it will start at the current @start pointer
 579  * and will walk through the queue until it reaches the @end pointer.
 580  */
 581 void rt2x00queue_for_each_entry(struct data_queue *queue,
 582                                 enum queue_index start,
 583                                 enum queue_index end,
 584                                 void (*fn)(struct queue_entry *entry));
 585
 586 /**
 587  * rt2x00queue_empty - Check if the queue is empty.
 588  * @queue: Queue to check if empty.
 589  */
 590 static inline int rt2x00queue_empty(struct data_queue *queue)
 591 {
 592         return queue->length == 0;
 593 }
 594
 595 /**
 596  * rt2x00queue_full - Check if the queue is full.
 597  * @queue: Queue to check if full.
 598  */
 599 static inline int rt2x00queue_full(struct data_queue *queue)
 600 {
 601         return queue->length == queue->limit;
 602 }
 603
 604 /**
 605  * rt2x00queue_free - Check the number of available entries in queue.
 606  * @queue: Queue to check.
 607  */
 608 static inline int rt2x00queue_available(struct data_queue *queue)
 609 {
 610         return queue->limit - queue->length;
 611 }
 612
 613 /**
 614  * rt2x00queue_threshold - Check if the queue is below threshold
 615  * @queue: Queue to check.
 616  */
 617 static inline int rt2x00queue_threshold(struct data_queue *queue)
 618 {
 619         return rt2x00queue_available(queue) < queue->threshold;
 620 }
 621
 622 /**
 623  * rt2x00queue_status_timeout - Check if a timeout occured for STATUS reports
 624  * @queue: Queue to check.
 625  */
 626 static inline int rt2x00queue_status_timeout(struct data_queue *queue)
 627 {
 628         return time_after(queue->last_action[Q_INDEX_DMA_DONE],
 629                           queue->last_action[Q_INDEX_DONE] + (HZ / 10));
 630 }
 631
 632 /**
 633  * rt2x00queue_timeout - Check if a timeout occured for DMA transfers
 634  * @queue: Queue to check.
 635  */
 636 static inline int rt2x00queue_dma_timeout(struct data_queue *queue)
 637 {
 638         return time_after(queue->last_action[Q_INDEX],
 639                           queue->last_action[Q_INDEX_DMA_DONE] + (HZ / 10));
 640 }
 641
 642 /**
 643  * _rt2x00_desc_read - Read a word from the hardware descriptor.
 644  * @desc: Base descriptor address
 645  * @word: Word index from where the descriptor should be read.
 646  * @value: Address where the descriptor value should be written into.
 647  */
 648 static inline void _rt2x00_desc_read(__le32 *desc, const u8 word, __le32 *value)
 649 {
 650         *value = desc[word];
 651 }
 652
 653 /**
 654  * rt2x00_desc_read - Read a word from the hardware descriptor, this
 655  * function will take care of the byte ordering.
 656  * @desc: Base descriptor address
 657  * @word: Word index from where the descriptor should be read.
 658  * @value: Address where the descriptor value should be written into.
 659  */
 660 static inline void rt2x00_desc_read(__le32 *desc, const u8 word, u32 *value)
 661 {
 662         __le32 tmp;
 663         _rt2x00_desc_read(desc, word, &tmp);
 664         *value = le32_to_cpu(tmp);
 665 }
 666
 667 /**
 668  * rt2x00_desc_write - write a word to the hardware descriptor, this
 669  * function will take care of the byte ordering.
 670  * @desc: Base descriptor address
 671  * @word: Word index from where the descriptor should be written.
 672  * @value: Value that should be written into the descriptor.
 673  */
 674 static inline void _rt2x00_desc_write(__le32 *desc, const u8 word, __le32 value)
 675 {
 676         desc[word] = value;
 677 }
 678
 679 /**
 680  * rt2x00_desc_write - write a word to the hardware descriptor.
 681  * @desc: Base descriptor address
 682  * @word: Word index from where the descriptor should be written.
 683  * @value: Value that should be written into the descriptor.
 684  */
 685 static inline void rt2x00_desc_write(__le32 *desc, const u8 word, u32 value)
 686 {
 687         _rt2x00_desc_write(desc, word, cpu_to_le32(value));
 688 }
 689
 690 #endif /* RT2X00QUEUE_H */