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 unspecified, 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         TXDONE_AMPDU,
 221 };
 222
 223 /**
 224  * struct txdone_entry_desc: TX done entry descriptor
 225  *
 226  * Summary of information that has been read from the TX frame descriptor
 227  * after the device is done with transmission.
 228  *
 229  * @flags: TX done flags (See &enum txdone_entry_desc_flags).
 230  * @retry: Retry count.
 231  */
 232 struct txdone_entry_desc {
 233         unsigned long flags;
 234         int retry;
 235 };
 236
 237 /**
 238  * enum txentry_desc_flags: Status flags for TX entry descriptor
 239  *
 240  * @ENTRY_TXD_RTS_FRAME: This frame is a RTS frame.
 241  * @ENTRY_TXD_CTS_FRAME: This frame is a CTS-to-self frame.
 242  * @ENTRY_TXD_GENERATE_SEQ: This frame requires sequence counter.
 243  * @ENTRY_TXD_FIRST_FRAGMENT: This is the first frame.
 244  * @ENTRY_TXD_MORE_FRAG: This frame is followed by another fragment.
 245  * @ENTRY_TXD_REQ_TIMESTAMP: Require timestamp to be inserted.
 246  * @ENTRY_TXD_BURST: This frame belongs to the same burst event.
 247  * @ENTRY_TXD_ACK: An ACK is required for this frame.
 248  * @ENTRY_TXD_RETRY_MODE: When set, the long retry count is used.
 249  * @ENTRY_TXD_ENCRYPT: This frame should be encrypted.
 250  * @ENTRY_TXD_ENCRYPT_PAIRWISE: Use pairwise key table (instead of shared).
 251  * @ENTRY_TXD_ENCRYPT_IV: Generate IV/EIV in hardware.
 252  * @ENTRY_TXD_ENCRYPT_MMIC: Generate MIC in hardware.
 253  * @ENTRY_TXD_HT_AMPDU: This frame is part of an AMPDU.
 254  * @ENTRY_TXD_HT_BW_40: Use 40MHz Bandwidth.
 255  * @ENTRY_TXD_HT_SHORT_GI: Use short GI.
 256  * @ENTRY_TXD_HT_MIMO_PS: The receiving STA is in dynamic SM PS mode.
 257  */
 258 enum txentry_desc_flags {
 259         ENTRY_TXD_RTS_FRAME,
 260         ENTRY_TXD_CTS_FRAME,
 261         ENTRY_TXD_GENERATE_SEQ,
 262         ENTRY_TXD_FIRST_FRAGMENT,
 263         ENTRY_TXD_MORE_FRAG,
 264         ENTRY_TXD_REQ_TIMESTAMP,
 265         ENTRY_TXD_BURST,
 266         ENTRY_TXD_ACK,
 267         ENTRY_TXD_RETRY_MODE,
 268         ENTRY_TXD_ENCRYPT,
 269         ENTRY_TXD_ENCRYPT_PAIRWISE,
 270         ENTRY_TXD_ENCRYPT_IV,
 271         ENTRY_TXD_ENCRYPT_MMIC,
 272         ENTRY_TXD_HT_AMPDU,
 273         ENTRY_TXD_HT_BW_40,
 274         ENTRY_TXD_HT_SHORT_GI,
 275         ENTRY_TXD_HT_MIMO_PS,
 276 };
 277
 278 /**
 279  * struct txentry_desc: TX Entry descriptor
 280  *
 281  * Summary of information for the frame descriptor before sending a TX frame.
 282  *
 283  * @flags: Descriptor flags (See &enum queue_entry_flags).
 284  * @length: Length of the entire frame.
 285  * @header_length: Length of 802.11 header.
 286  * @length_high: PLCP length high word.
 287  * @length_low: PLCP length low word.
 288  * @signal: PLCP signal.
 289  * @service: PLCP service.
 290  * @msc: MCS.
 291  * @stbc: STBC.
 292  * @ba_size: BA size.
 293  * @rate_mode: Rate mode (See @enum rate_modulation).
 294  * @mpdu_density: MDPU density.
 295  * @retry_limit: Max number of retries.
 296  * @ifs: IFS value.
 297  * @txop: IFS value for 11n capable chips.
 298  * @cipher: Cipher type used for encryption.
 299  * @key_idx: Key index used for encryption.
 300  * @iv_offset: Position where IV should be inserted by hardware.
 301  * @iv_len: Length of IV data.
 302  */
 303 struct txentry_desc {
 304         unsigned long flags;
 305
 306         u16 length;
 307         u16 header_length;
 308
 309         union {
 310                 struct {
 311                         u16 length_high;
 312                         u16 length_low;
 313                         u16 signal;
 314                         u16 service;
 315                         enum ifs ifs;
 316                 } plcp;
 317
 318                 struct {
 319                         u16 mcs;
 320                         u8 stbc;
 321                         u8 ba_size;
 322                         u8 mpdu_density;
 323                         enum txop txop;
 324                 } ht;
 325         } u;
 326
 327         enum rate_modulation rate_mode;
 328
 329         short retry_limit;
 330
 331         enum cipher cipher;
 332         u16 key_idx;
 333         u16 iv_offset;
 334         u16 iv_len;
 335 };
 336
 337 /**
 338  * enum queue_entry_flags: Status flags for queue entry
 339  *
 340  * @ENTRY_BCN_ASSIGNED: This entry has been assigned to an interface.
 341  *      As long as this bit is set, this entry may only be touched
 342  *      through the interface structure.
 343  * @ENTRY_OWNER_DEVICE_DATA: This entry is owned by the device for data
 344  *      transfer (either TX or RX depending on the queue). The entry should
 345  *      only be touched after the device has signaled it is done with it.
 346  * @ENTRY_DATA_PENDING: This entry contains a valid frame and is waiting
 347  *      for the signal to start sending.
 348  * @ENTRY_DATA_IO_FAILED: Hardware indicated that an IO error occurred
 349  *      while transferring the data to the hardware. No TX status report will
 350  *      be expected from the hardware.
 351  * @ENTRY_DATA_STATUS_PENDING: The entry has been send to the device and
 352  *      returned. It is now waiting for the status reporting before the
 353  *      entry can be reused again.
 354  */
 355 enum queue_entry_flags {
 356         ENTRY_BCN_ASSIGNED,
 357         ENTRY_OWNER_DEVICE_DATA,
 358         ENTRY_DATA_PENDING,
 359         ENTRY_DATA_IO_FAILED,
 360         ENTRY_DATA_STATUS_PENDING,
 361 };
 362
 363 /**
 364  * struct queue_entry: Entry inside the &struct data_queue
 365  *
 366  * @flags: Entry flags, see &enum queue_entry_flags.
 367  * @last_action: Timestamp of last change.
 368  * @queue: The data queue (&struct data_queue) to which this entry belongs.
 369  * @skb: The buffer which is currently being transmitted (for TX queue),
 370  *      or used to directly receive data in (for RX queue).
 371  * @entry_idx: The entry index number.
 372  * @priv_data: Private data belonging to this queue entry. The pointer
 373  *      points to data specific to a particular driver and queue type.
 374  */
 375 struct queue_entry {
 376         unsigned long flags;
 377         unsigned long last_action;
 378
 379         struct data_queue *queue;
 380
 381         struct sk_buff *skb;
 382
 383         unsigned int entry_idx;
 384
 385         void *priv_data;
 386 };
 387
 388 /**
 389  * enum queue_index: Queue index type
 390  *
 391  * @Q_INDEX: Index pointer to the current entry in the queue, if this entry is
 392  *      owned by the hardware then the queue is considered to be full.
 393  * @Q_INDEX_DMA_DONE: Index pointer for the next entry which will have been
 394  *      transferred to the hardware.
 395  * @Q_INDEX_DONE: Index pointer to the next entry which will be completed by
 396  *      the hardware and for which we need to run the txdone handler. If this
 397  *      entry is not owned by the hardware the queue is considered to be empty.
 398  * @Q_INDEX_MAX: Keep last, used in &struct data_queue to determine the size
 399  *      of the index array.
 400  */
 401 enum queue_index {
 402         Q_INDEX,
 403         Q_INDEX_DMA_DONE,
 404         Q_INDEX_DONE,
 405         Q_INDEX_MAX,
 406 };
 407
 408 /**
 409  * enum data_queue_flags: Status flags for data queues
 410  *
 411  * @QUEUE_STARTED: The queue has been started. Fox RX queues this means the
 412  *      device might be DMA'ing skbuffers. TX queues will accept skbuffers to
 413  *      be transmitted and beacon queues will start beaconing the configured
 414  *      beacons.
 415  * @QUEUE_PAUSED: The queue has been started but is currently paused.
 416  *      When this bit is set, the queue has been stopped in mac80211,
 417  *      preventing new frames to be enqueued. However, a few frames
 418  *      might still appear shortly after the pausing...
 419  */
 420 enum data_queue_flags {
 421         QUEUE_STARTED,
 422         QUEUE_PAUSED,
 423 };
 424
 425 /**
 426  * struct data_queue: Data queue
 427  *
 428  * @rt2x00dev: Pointer to main &struct rt2x00dev where this queue belongs to.
 429  * @entries: Base address of the &struct queue_entry which are
 430  *      part of this queue.
 431  * @qid: The queue identification, see &enum data_queue_qid.
 432  * @flags: Entry flags, see &enum queue_entry_flags.
 433  * @status_lock: The mutex for protecting the start/stop/flush
 434  *      handling on this queue.
 435  * @tx_lock: Spinlock to serialize tx operations on this queue.
 436  * @index_lock: Spinlock to protect index handling. Whenever @index, @index_done or
 437  *      @index_crypt needs to be changed this lock should be grabbed to prevent
 438  *      index corruption due to concurrency.
 439  * @count: Number of frames handled in the queue.
 440  * @limit: Maximum number of entries in the queue.
 441  * @threshold: Minimum number of free entries before queue is kicked by force.
 442  * @length: Number of frames in queue.
 443  * @index: Index pointers to entry positions in the queue,
 444  *      use &enum queue_index to get a specific index field.
 445  * @txop: maximum burst time.
 446  * @aifs: The aifs value for outgoing frames (field ignored in RX queue).
 447  * @cw_min: The cw min value for outgoing frames (field ignored in RX queue).
 448  * @cw_max: The cw max value for outgoing frames (field ignored in RX queue).
 449  * @data_size: Maximum data size for the frames in this queue.
 450  * @desc_size: Hardware descriptor size for the data in this queue.
 451  * @usb_endpoint: Device endpoint used for communication (USB only)
 452  * @usb_maxpacket: Max packet size for given endpoint (USB only)
 453  */
 454 struct data_queue {
 455         struct rt2x00_dev *rt2x00dev;
 456         struct queue_entry *entries;
 457
 458         enum data_queue_qid qid;
 459         unsigned long flags;
 460
 461         struct mutex status_lock;
 462         spinlock_t tx_lock;
 463         spinlock_t index_lock;
 464
 465         unsigned int count;
 466         unsigned short limit;
 467         unsigned short threshold;
 468         unsigned short length;
 469         unsigned short index[Q_INDEX_MAX];
 470
 471         unsigned short txop;
 472         unsigned short aifs;
 473         unsigned short cw_min;
 474         unsigned short cw_max;
 475
 476         unsigned short data_size;
 477         unsigned short desc_size;
 478
 479         unsigned short usb_endpoint;
 480         unsigned short usb_maxpacket;
 481 };
 482
 483 /**
 484  * struct data_queue_desc: Data queue description
 485  *
 486  * The information in this structure is used by drivers
 487  * to inform rt2x00lib about the creation of the data queue.
 488  *
 489  * @entry_num: Maximum number of entries for a queue.
 490  * @data_size: Maximum data size for the frames in this queue.
 491  * @desc_size: Hardware descriptor size for the data in this queue.
 492  * @priv_size: Size of per-queue_entry private data.
 493  */
 494 struct data_queue_desc {
 495         unsigned short entry_num;
 496         unsigned short data_size;
 497         unsigned short desc_size;
 498         unsigned short priv_size;
 499 };
 500
 501 /**
 502  * queue_end - Return pointer to the last queue (HELPER MACRO).
 503  * @__dev: Pointer to &struct rt2x00_dev
 504  *
 505  * Using the base rx pointer and the maximum number of available queues,
 506  * this macro will return the address of 1 position beyond  the end of the
 507  * queues array.
 508  */
 509 #define queue_end(__dev) \
 510         &(__dev)->rx[(__dev)->data_queues]
 511
 512 /**
 513  * tx_queue_end - Return pointer to the last TX queue (HELPER MACRO).
 514  * @__dev: Pointer to &struct rt2x00_dev
 515  *
 516  * Using the base tx pointer and the maximum number of available TX
 517  * queues, this macro will return the address of 1 position beyond
 518  * the end of the TX queue array.
 519  */
 520 #define tx_queue_end(__dev) \
 521         &(__dev)->tx[(__dev)->ops->tx_queues]
 522
 523 /**
 524  * queue_next - Return pointer to next queue in list (HELPER MACRO).
 525  * @__queue: Current queue for which we need the next queue
 526  *
 527  * Using the current queue address we take the address directly
 528  * after the queue to take the next queue. Note that this macro
 529  * should be used carefully since it does not protect against
 530  * moving past the end of the list. (See macros &queue_end and
 531  * &tx_queue_end for determining the end of the queue).
 532  */
 533 #define queue_next(__queue) \
 534         &(__queue)[1]
 535
 536 /**
 537  * queue_loop - Loop through the queues within a specific range (HELPER MACRO).
 538  * @__entry: Pointer where the current queue entry will be stored in.
 539  * @__start: Start queue pointer.
 540  * @__end: End queue pointer.
 541  *
 542  * This macro will loop through all queues between &__start and &__end.
 543  */
 544 #define queue_loop(__entry, __start, __end)                     \
 545         for ((__entry) = (__start);                             \
 546              prefetch(queue_next(__entry)), (__entry) != (__end);\
 547              (__entry) = queue_next(__entry))
 548
 549 /**
 550  * queue_for_each - Loop through all queues
 551  * @__dev: Pointer to &struct rt2x00_dev
 552  * @__entry: Pointer where the current queue entry will be stored in.
 553  *
 554  * This macro will loop through all available queues.
 555  */
 556 #define queue_for_each(__dev, __entry) \
 557         queue_loop(__entry, (__dev)->rx, queue_end(__dev))
 558
 559 /**
 560  * tx_queue_for_each - Loop through the TX 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 excluding
 565  * the Beacon and Atim queues.
 566  */
 567 #define tx_queue_for_each(__dev, __entry) \
 568         queue_loop(__entry, (__dev)->tx, tx_queue_end(__dev))
 569
 570 /**
 571  * txall_queue_for_each - Loop through all TX related queues
 572  * @__dev: Pointer to &struct rt2x00_dev
 573  * @__entry: Pointer where the current queue entry will be stored in.
 574  *
 575  * This macro will loop through all TX related queues including
 576  * the Beacon and Atim queues.
 577  */
 578 #define txall_queue_for_each(__dev, __entry) \
 579         queue_loop(__entry, (__dev)->tx, queue_end(__dev))
 580
 581 /**
 582  * rt2x00queue_for_each_entry - Loop through all entries in the queue
 583  * @queue: Pointer to @data_queue
 584  * @start: &enum queue_index Pointer to start index
 585  * @end: &enum queue_index Pointer to end index
 586  * @data: Data to pass to the callback function
 587  * @fn: The function to call for each &struct queue_entry
 588  *
 589  * This will walk through all entries in the queue, in chronological
 590  * order. This means it will start at the current @start pointer
 591  * and will walk through the queue until it reaches the @end pointer.
 592  *
 593  * If fn returns true for an entry rt2x00queue_for_each_entry will stop
 594  * processing and return true as well.
 595  */
 596 bool rt2x00queue_for_each_entry(struct data_queue *queue,
 597                                 enum queue_index start,
 598                                 enum queue_index end,
 599                                 void *data,
 600                                 bool (*fn)(struct queue_entry *entry,
 601                                            void *data));
 602
 603 /**
 604  * rt2x00queue_empty - Check if the queue is empty.
 605  * @queue: Queue to check if empty.
 606  */
 607 static inline int rt2x00queue_empty(struct data_queue *queue)
 608 {
 609         return queue->length == 0;
 610 }
 611
 612 /**
 613  * rt2x00queue_full - Check if the queue is full.
 614  * @queue: Queue to check if full.
 615  */
 616 static inline int rt2x00queue_full(struct data_queue *queue)
 617 {
 618         return queue->length == queue->limit;
 619 }
 620
 621 /**
 622  * rt2x00queue_free - Check the number of available entries in queue.
 623  * @queue: Queue to check.
 624  */
 625 static inline int rt2x00queue_available(struct data_queue *queue)
 626 {
 627         return queue->limit - queue->length;
 628 }
 629
 630 /**
 631  * rt2x00queue_threshold - Check if the queue is below threshold
 632  * @queue: Queue to check.
 633  */
 634 static inline int rt2x00queue_threshold(struct data_queue *queue)
 635 {
 636         return rt2x00queue_available(queue) < queue->threshold;
 637 }
 638
 639 /**
 640  * rt2x00queue_status_timeout - Check if a timeout occurred for STATUS reports
 641  * @entry: Queue entry to check.
 642  */
 643 static inline int rt2x00queue_status_timeout(struct queue_entry *entry)
 644 {
 645         if (!test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
 646                 return false;
 647         return time_after(jiffies, entry->last_action + msecs_to_jiffies(100));
 648 }
 649
 650 /**
 651  * rt2x00queue_dma_timeout - Check if a timeout occurred for DMA transfers
 652  * @entry: Queue entry to check.
 653  */
 654 static inline int rt2x00queue_dma_timeout(struct queue_entry *entry)
 655 {
 656         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 657                 return false;
 658         return time_after(jiffies, entry->last_action + msecs_to_jiffies(100));
 659 }
 660
 661 /**
 662  * _rt2x00_desc_read - Read a word from the hardware descriptor.
 663  * @desc: Base descriptor address
 664  * @word: Word index from where the descriptor should be read.
 665  * @value: Address where the descriptor value should be written into.
 666  */
 667 static inline void _rt2x00_desc_read(__le32 *desc, const u8 word, __le32 *value)
 668 {
 669         *value = desc[word];
 670 }
 671
 672 /**
 673  * rt2x00_desc_read - Read a word from the hardware descriptor, this
 674  * function will take care of the byte ordering.
 675  * @desc: Base descriptor address
 676  * @word: Word index from where the descriptor should be read.
 677  * @value: Address where the descriptor value should be written into.
 678  */
 679 static inline void rt2x00_desc_read(__le32 *desc, const u8 word, u32 *value)
 680 {
 681         __le32 tmp;
 682         _rt2x00_desc_read(desc, word, &tmp);
 683         *value = le32_to_cpu(tmp);
 684 }
 685
 686 /**
 687  * rt2x00_desc_write - write a word to the hardware descriptor, this
 688  * function will take care of the byte ordering.
 689  * @desc: Base descriptor address
 690  * @word: Word index from where the descriptor should be written.
 691  * @value: Value that should be written into the descriptor.
 692  */
 693 static inline void _rt2x00_desc_write(__le32 *desc, const u8 word, __le32 value)
 694 {
 695         desc[word] = value;
 696 }
 697
 698 /**
 699  * rt2x00_desc_write - write a word to the hardware descriptor.
 700  * @desc: Base descriptor address
 701  * @word: Word index from where the descriptor should be written.
 702  * @value: Value that should be written into the descriptor.
 703  */
 704 static inline void rt2x00_desc_write(__le32 *desc, const u8 word, u32 value)
 705 {
 706         _rt2x00_desc_write(desc, word, cpu_to_le32(value));
 707 }
 708
 709 #endif /* RT2X00QUEUE_H */