drivers/net/wireless/ralink/rt2x00/rt2x00queue.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3         Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
   4         <http://rt2x00.serialmonkey.com>
   5
   6  */
   7
   8 /*
   9         Module: rt2x00
  10         Abstract: rt2x00 queue datastructures and routines
  11  */
  12
  13 #ifndef RT2X00QUEUE_H
  14 #define RT2X00QUEUE_H
  15
  16 #include <linux/prefetch.h>
  17
  18 /**
  19  * DOC: Entry frame size
  20  *
  21  * Ralink PCI devices demand the Frame size to be a multiple of 128 bytes,
  22  * for USB devices this restriction does not apply, but the value of
  23  * 2432 makes sense since it is big enough to contain the maximum fragment
  24  * size according to the ieee802.11 specs.
  25  * The aggregation size depends on support from the driver, but should
  26  * be something around 3840 bytes.
  27  */
  28 #define DATA_FRAME_SIZE         2432
  29 #define MGMT_FRAME_SIZE         256
  30 #define AGGREGATION_SIZE        3840
  31
  32 /**
  33  * enum data_queue_qid: Queue identification
  34  *
  35  * @QID_AC_VO: AC VO queue
  36  * @QID_AC_VI: AC VI queue
  37  * @QID_AC_BE: AC BE queue
  38  * @QID_AC_BK: AC BK queue
  39  * @QID_HCCA: HCCA queue
  40  * @QID_MGMT: MGMT queue (prio queue)
  41  * @QID_RX: RX queue
  42  * @QID_OTHER: None of the above (don't use, only present for completeness)
  43  * @QID_BEACON: Beacon queue (value unspecified, don't send it to device)
  44  * @QID_ATIM: Atim queue (value unspecified, don't send it to device)
  45  */
  46 enum data_queue_qid {
  47         QID_AC_VO = 0,
  48         QID_AC_VI = 1,
  49         QID_AC_BE = 2,
  50         QID_AC_BK = 3,
  51         QID_HCCA = 4,
  52         QID_MGMT = 13,
  53         QID_RX = 14,
  54         QID_OTHER = 15,
  55         QID_BEACON,
  56         QID_ATIM,
  57 };
  58
  59 /**
  60  * enum skb_frame_desc_flags: Flags for &struct skb_frame_desc
  61  *
  62  * @SKBDESC_DMA_MAPPED_RX: &skb_dma field has been mapped for RX
  63  * @SKBDESC_DMA_MAPPED_TX: &skb_dma field has been mapped for TX
  64  * @SKBDESC_IV_STRIPPED: Frame contained a IV/EIV provided by
  65  *      mac80211 but was stripped for processing by the driver.
  66  * @SKBDESC_NOT_MAC80211: Frame didn't originate from mac80211,
  67  *      don't try to pass it back.
  68  * @SKBDESC_DESC_IN_SKB: The descriptor is at the start of the
  69  *      skb, instead of in the desc field.
  70  */
  71 enum skb_frame_desc_flags {
  72         SKBDESC_DMA_MAPPED_RX = 1 << 0,
  73         SKBDESC_DMA_MAPPED_TX = 1 << 1,
  74         SKBDESC_IV_STRIPPED = 1 << 2,
  75         SKBDESC_NOT_MAC80211 = 1 << 3,
  76         SKBDESC_DESC_IN_SKB = 1 << 4,
  77 };
  78
  79 /**
  80  * struct skb_frame_desc: Descriptor information for the skb buffer
  81  *
  82  * This structure is placed over the driver_data array, this means that
  83  * this structure should not exceed the size of that array (40 bytes).
  84  *
  85  * @flags: Frame flags, see &enum skb_frame_desc_flags.
  86  * @desc_len: Length of the frame descriptor.
  87  * @tx_rate_idx: the index of the TX rate, used for TX status reporting
  88  * @tx_rate_flags: the TX rate flags, used for TX status reporting
  89  * @desc: Pointer to descriptor part of the frame.
  90  *      Note that this pointer could point to something outside
  91  *      of the scope of the skb->data pointer.
  92  * @iv: IV/EIV data used during encryption/decryption.
  93  * @skb_dma: (PCI-only) the DMA address associated with the sk buffer.
  94  * @sta: The station where sk buffer was sent.
  95  */
  96 struct skb_frame_desc {
  97         u8 flags;
  98
  99         u8 desc_len;
 100         u8 tx_rate_idx;
 101         u8 tx_rate_flags;
 102
 103         void *desc;
 104
 105         __le32 iv[2];
 106
 107         dma_addr_t skb_dma;
 108         struct ieee80211_sta *sta;
 109 };
 110
 111 /**
 112  * get_skb_frame_desc - Obtain the rt2x00 frame descriptor from a sk_buff.
 113  * @skb: &struct sk_buff from where we obtain the &struct skb_frame_desc
 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) >
 118                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE);
 119         return (struct skb_frame_desc *)&IEEE80211_SKB_CB(skb)->driver_data;
 120 }
 121
 122 /**
 123  * enum rxdone_entry_desc_flags: Flags for &struct rxdone_entry_desc
 124  *
 125  * @RXDONE_SIGNAL_PLCP: Signal field contains the plcp value.
 126  * @RXDONE_SIGNAL_BITRATE: Signal field contains the bitrate value.
 127  * @RXDONE_SIGNAL_MCS: Signal field contains the mcs value.
 128  * @RXDONE_MY_BSS: Does this frame originate from device's BSS.
 129  * @RXDONE_CRYPTO_IV: Driver provided IV/EIV data.
 130  * @RXDONE_CRYPTO_ICV: Driver provided ICV data.
 131  * @RXDONE_L2PAD: 802.11 payload has been padded to 4-byte boundary.
 132  */
 133 enum rxdone_entry_desc_flags {
 134         RXDONE_SIGNAL_PLCP = BIT(0),
 135         RXDONE_SIGNAL_BITRATE = BIT(1),
 136         RXDONE_SIGNAL_MCS = BIT(2),
 137         RXDONE_MY_BSS = BIT(3),
 138         RXDONE_CRYPTO_IV = BIT(4),
 139         RXDONE_CRYPTO_ICV = BIT(5),
 140         RXDONE_L2PAD = BIT(6),
 141 };
 142
 143 /**
 144  * RXDONE_SIGNAL_MASK - Define to mask off all &rxdone_entry_desc_flags flags
 145  * except for the RXDONE_SIGNAL_* flags. This is useful to convert the dev_flags
 146  * from &rxdone_entry_desc to a signal value type.
 147  */
 148 #define RXDONE_SIGNAL_MASK \
 149         ( RXDONE_SIGNAL_PLCP | RXDONE_SIGNAL_BITRATE | RXDONE_SIGNAL_MCS )
 150
 151 /**
 152  * struct rxdone_entry_desc: RX Entry descriptor
 153  *
 154  * Summary of information that has been read from the RX frame descriptor.
 155  *
 156  * @timestamp: RX Timestamp
 157  * @signal: Signal of the received frame.
 158  * @rssi: RSSI of the received frame.
 159  * @size: Data size of the received frame.
 160  * @flags: MAC80211 receive flags (See &enum mac80211_rx_flags).
 161  * @dev_flags: Ralink receive flags (See &enum rxdone_entry_desc_flags).
 162  * @rate_mode: Rate mode (See @enum rate_modulation).
 163  * @cipher: Cipher type used during decryption.
 164  * @cipher_status: Decryption status.
 165  * @iv: IV/EIV data used during decryption.
 166  * @icv: ICV data used during decryption.
 167  */
 168 struct rxdone_entry_desc {
 169         u64 timestamp;
 170         int signal;
 171         int rssi;
 172         int size;
 173         int flags;
 174         int dev_flags;
 175         u16 rate_mode;
 176         u16 enc_flags;
 177         enum mac80211_rx_encoding encoding;
 178         enum rate_info_bw bw;
 179         u8 cipher;
 180         u8 cipher_status;
 181
 182         __le32 iv[2];
 183         __le32 icv;
 184 };
 185
 186 /**
 187  * enum txdone_entry_desc_flags: Flags for &struct txdone_entry_desc
 188  *
 189  * Every txdone report has to contain the basic result of the
 190  * transmission, either &TXDONE_UNKNOWN, &TXDONE_SUCCESS or
 191  * &TXDONE_FAILURE. The flag &TXDONE_FALLBACK can be used in
 192  * conjunction with all of these flags but should only be set
 193  * if retires > 0. The flag &TXDONE_EXCESSIVE_RETRY can only be used
 194  * in conjunction with &TXDONE_FAILURE.
 195  *
 196  * @TXDONE_UNKNOWN: Hardware could not determine success of transmission.
 197  * @TXDONE_SUCCESS: Frame was successfully send
 198  * @TXDONE_FALLBACK: Hardware used fallback rates for retries
 199  * @TXDONE_FAILURE: Frame was not successfully send
 200  * @TXDONE_EXCESSIVE_RETRY: In addition to &TXDONE_FAILURE, the
 201  *      frame transmission failed due to excessive retries.
 202  */
 203 enum txdone_entry_desc_flags {
 204         TXDONE_UNKNOWN,
 205         TXDONE_SUCCESS,
 206         TXDONE_FALLBACK,
 207         TXDONE_FAILURE,
 208         TXDONE_EXCESSIVE_RETRY,
 209         TXDONE_AMPDU,
 210         TXDONE_NO_ACK_REQ,
 211 };
 212
 213 /**
 214  * struct txdone_entry_desc: TX done entry descriptor
 215  *
 216  * Summary of information that has been read from the TX frame descriptor
 217  * after the device is done with transmission.
 218  *
 219  * @flags: TX done flags (See &enum txdone_entry_desc_flags).
 220  * @retry: Retry count.
 221  */
 222 struct txdone_entry_desc {
 223         unsigned long flags;
 224         int retry;
 225 };
 226
 227 /**
 228  * enum txentry_desc_flags: Status flags for TX entry descriptor
 229  *
 230  * @ENTRY_TXD_RTS_FRAME: This frame is a RTS frame.
 231  * @ENTRY_TXD_CTS_FRAME: This frame is a CTS-to-self frame.
 232  * @ENTRY_TXD_GENERATE_SEQ: This frame requires sequence counter.
 233  * @ENTRY_TXD_FIRST_FRAGMENT: This is the first frame.
 234  * @ENTRY_TXD_MORE_FRAG: This frame is followed by another fragment.
 235  * @ENTRY_TXD_REQ_TIMESTAMP: Require timestamp to be inserted.
 236  * @ENTRY_TXD_BURST: This frame belongs to the same burst event.
 237  * @ENTRY_TXD_ACK: An ACK is required for this frame.
 238  * @ENTRY_TXD_RETRY_MODE: When set, the long retry count is used.
 239  * @ENTRY_TXD_ENCRYPT: This frame should be encrypted.
 240  * @ENTRY_TXD_ENCRYPT_PAIRWISE: Use pairwise key table (instead of shared).
 241  * @ENTRY_TXD_ENCRYPT_IV: Generate IV/EIV in hardware.
 242  * @ENTRY_TXD_ENCRYPT_MMIC: Generate MIC in hardware.
 243  * @ENTRY_TXD_HT_AMPDU: This frame is part of an AMPDU.
 244  * @ENTRY_TXD_HT_BW_40: Use 40MHz Bandwidth.
 245  * @ENTRY_TXD_HT_SHORT_GI: Use short GI.
 246  * @ENTRY_TXD_HT_MIMO_PS: The receiving STA is in dynamic SM PS mode.
 247  */
 248 enum txentry_desc_flags {
 249         ENTRY_TXD_RTS_FRAME,
 250         ENTRY_TXD_CTS_FRAME,
 251         ENTRY_TXD_GENERATE_SEQ,
 252         ENTRY_TXD_FIRST_FRAGMENT,
 253         ENTRY_TXD_MORE_FRAG,
 254         ENTRY_TXD_REQ_TIMESTAMP,
 255         ENTRY_TXD_BURST,
 256         ENTRY_TXD_ACK,
 257         ENTRY_TXD_RETRY_MODE,
 258         ENTRY_TXD_ENCRYPT,
 259         ENTRY_TXD_ENCRYPT_PAIRWISE,
 260         ENTRY_TXD_ENCRYPT_IV,
 261         ENTRY_TXD_ENCRYPT_MMIC,
 262         ENTRY_TXD_HT_AMPDU,
 263         ENTRY_TXD_HT_BW_40,
 264         ENTRY_TXD_HT_SHORT_GI,
 265         ENTRY_TXD_HT_MIMO_PS,
 266 };
 267
 268 /**
 269  * struct txentry_desc: TX Entry descriptor
 270  *
 271  * Summary of information for the frame descriptor before sending a TX frame.
 272  *
 273  * @flags: Descriptor flags (See &enum queue_entry_flags).
 274  * @length: Length of the entire frame.
 275  * @header_length: Length of 802.11 header.
 276  * @length_high: PLCP length high word.
 277  * @length_low: PLCP length low word.
 278  * @signal: PLCP signal.
 279  * @service: PLCP service.
 280  * @msc: MCS.
 281  * @stbc: Use Space Time Block Coding (only available for MCS rates < 8).
 282  * @ba_size: Size of the recepients RX reorder buffer - 1.
 283  * @rate_mode: Rate mode (See @enum rate_modulation).
 284  * @mpdu_density: MDPU density.
 285  * @retry_limit: Max number of retries.
 286  * @ifs: IFS value.
 287  * @txop: IFS value for 11n capable chips.
 288  * @cipher: Cipher type used for encryption.
 289  * @key_idx: Key index used for encryption.
 290  * @iv_offset: Position where IV should be inserted by hardware.
 291  * @iv_len: Length of IV data.
 292  */
 293 struct txentry_desc {
 294         unsigned long flags;
 295
 296         u16 length;
 297         u16 header_length;
 298
 299         union {
 300                 struct {
 301                         u16 length_high;
 302                         u16 length_low;
 303                         u16 signal;
 304                         u16 service;
 305                         enum ifs ifs;
 306                 } plcp;
 307
 308                 struct {
 309                         u16 mcs;
 310                         u8 stbc;
 311                         u8 ba_size;
 312                         u8 mpdu_density;
 313                         enum txop txop;
 314                         int wcid;
 315                 } ht;
 316         } u;
 317
 318         enum rate_modulation rate_mode;
 319
 320         short retry_limit;
 321
 322         enum cipher cipher;
 323         u16 key_idx;
 324         u16 iv_offset;
 325         u16 iv_len;
 326 };
 327
 328 /**
 329  * enum queue_entry_flags: Status flags for queue entry
 330  *
 331  * @ENTRY_BCN_ASSIGNED: This entry has been assigned to an interface.
 332  *      As long as this bit is set, this entry may only be touched
 333  *      through the interface structure.
 334  * @ENTRY_OWNER_DEVICE_DATA: This entry is owned by the device for data
 335  *      transfer (either TX or RX depending on the queue). The entry should
 336  *      only be touched after the device has signaled it is done with it.
 337  * @ENTRY_DATA_PENDING: This entry contains a valid frame and is waiting
 338  *      for the signal to start sending.
 339  * @ENTRY_DATA_IO_FAILED: Hardware indicated that an IO error occurred
 340  *      while transferring the data to the hardware. No TX status report will
 341  *      be expected from the hardware.
 342  * @ENTRY_DATA_STATUS_PENDING: The entry has been send to the device and
 343  *      returned. It is now waiting for the status reporting before the
 344  *      entry can be reused again.
 345  */
 346 enum queue_entry_flags {
 347         ENTRY_BCN_ASSIGNED,
 348         ENTRY_BCN_ENABLED,
 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  * @last_action: Timestamp of last change.
 360  * @queue: The data queue (&struct data_queue) to which this entry belongs.
 361  * @skb: The buffer which is currently being transmitted (for TX queue),
 362  *      or used to directly receive data in (for RX queue).
 363  * @entry_idx: The entry index number.
 364  * @priv_data: Private data belonging to this queue entry. The pointer
 365  *      points to data specific to a particular driver and queue type.
 366  * @status: Device specific status
 367  */
 368 struct queue_entry {
 369         unsigned long flags;
 370         unsigned long last_action;
 371
 372         struct data_queue *queue;
 373
 374         struct sk_buff *skb;
 375
 376         unsigned int entry_idx;
 377
 378         void *priv_data;
 379 };
 380
 381 /**
 382  * enum queue_index: Queue index type
 383  *
 384  * @Q_INDEX: Index pointer to the current entry in the queue, if this entry is
 385  *      owned by the hardware then the queue is considered to be full.
 386  * @Q_INDEX_DMA_DONE: Index pointer for the next entry which will have been
 387  *      transferred to the hardware.
 388  * @Q_INDEX_DONE: Index pointer to the next entry which will be completed by
 389  *      the hardware and for which we need to run the txdone handler. If this
 390  *      entry is not owned by the hardware the queue is considered to be empty.
 391  * @Q_INDEX_MAX: Keep last, used in &struct data_queue to determine the size
 392  *      of the index array.
 393  */
 394 enum queue_index {
 395         Q_INDEX,
 396         Q_INDEX_DMA_DONE,
 397         Q_INDEX_DONE,
 398         Q_INDEX_MAX,
 399 };
 400
 401 /**
 402  * enum data_queue_flags: Status flags for data queues
 403  *
 404  * @QUEUE_STARTED: The queue has been started. Fox RX queues this means the
 405  *      device might be DMA'ing skbuffers. TX queues will accept skbuffers to
 406  *      be transmitted and beacon queues will start beaconing the configured
 407  *      beacons.
 408  * @QUEUE_PAUSED: The queue has been started but is currently paused.
 409  *      When this bit is set, the queue has been stopped in mac80211,
 410  *      preventing new frames to be enqueued. However, a few frames
 411  *      might still appear shortly after the pausing...
 412  */
 413 enum data_queue_flags {
 414         QUEUE_STARTED,
 415         QUEUE_PAUSED,
 416 };
 417
 418 /**
 419  * struct data_queue: Data queue
 420  *
 421  * @rt2x00dev: Pointer to main &struct rt2x00dev where this queue belongs to.
 422  * @entries: Base address of the &struct queue_entry which are
 423  *      part of this queue.
 424  * @qid: The queue identification, see &enum data_queue_qid.
 425  * @flags: Entry flags, see &enum queue_entry_flags.
 426  * @status_lock: The mutex for protecting the start/stop/flush
 427  *      handling on this queue.
 428  * @tx_lock: Spinlock to serialize tx operations on this queue.
 429  * @index_lock: Spinlock to protect index handling. Whenever @index, @index_done or
 430  *      @index_crypt needs to be changed this lock should be grabbed to prevent
 431  *      index corruption due to concurrency.
 432  * @count: Number of frames handled in the queue.
 433  * @limit: Maximum number of entries in the queue.
 434  * @threshold: Minimum number of free entries before queue is kicked by force.
 435  * @length: Number of frames in queue.
 436  * @index: Index pointers to entry positions in the queue,
 437  *      use &enum queue_index to get a specific index field.
 438  * @wd_count: watchdog counter number of times entry does change
 439  *      in the queue
 440  * @wd_idx: index of queue entry saved by watchdog
 441  * @txop: maximum burst time.
 442  * @aifs: The aifs value for outgoing frames (field ignored in RX queue).
 443  * @cw_min: The cw min value for outgoing frames (field ignored in RX queue).
 444  * @cw_max: The cw max value for outgoing frames (field ignored in RX queue).
 445  * @data_size: Maximum data size for the frames in this queue.
 446  * @desc_size: Hardware descriptor size for the data in this queue.
 447  * @priv_size: Size of per-queue_entry private data.
 448  * @usb_endpoint: Device endpoint used for communication (USB only)
 449  * @usb_maxpacket: Max packet size for given endpoint (USB only)
 450  */
 451 struct data_queue {
 452         struct rt2x00_dev *rt2x00dev;
 453         struct queue_entry *entries;
 454
 455         enum data_queue_qid qid;
 456         unsigned long flags;
 457
 458         struct mutex status_lock;
 459         spinlock_t tx_lock;
 460         spinlock_t index_lock;
 461
 462         unsigned int count;
 463         unsigned short limit;
 464         unsigned short threshold;
 465         unsigned short length;
 466         unsigned short index[Q_INDEX_MAX];
 467
 468         unsigned short wd_count;
 469         unsigned int wd_idx;
 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 char  desc_size;
 478         unsigned char  winfo_size;
 479         unsigned short priv_size;
 480
 481         unsigned short usb_endpoint;
 482         unsigned short usb_maxpacket;
 483 };
 484
 485 /**
 486  * queue_end - Return pointer to the last queue (HELPER MACRO).
 487  * @__dev: Pointer to &struct rt2x00_dev
 488  *
 489  * Using the base rx pointer and the maximum number of available queues,
 490  * this macro will return the address of 1 position beyond  the end of the
 491  * queues array.
 492  */
 493 #define queue_end(__dev) \
 494         &(__dev)->rx[(__dev)->data_queues]
 495
 496 /**
 497  * tx_queue_end - Return pointer to the last TX queue (HELPER MACRO).
 498  * @__dev: Pointer to &struct rt2x00_dev
 499  *
 500  * Using the base tx pointer and the maximum number of available TX
 501  * queues, this macro will return the address of 1 position beyond
 502  * the end of the TX queue array.
 503  */
 504 #define tx_queue_end(__dev) \
 505         &(__dev)->tx[(__dev)->ops->tx_queues]
 506
 507 /**
 508  * queue_next - Return pointer to next queue in list (HELPER MACRO).
 509  * @__queue: Current queue for which we need the next queue
 510  *
 511  * Using the current queue address we take the address directly
 512  * after the queue to take the next queue. Note that this macro
 513  * should be used carefully since it does not protect against
 514  * moving past the end of the list. (See macros &queue_end and
 515  * &tx_queue_end for determining the end of the queue).
 516  */
 517 #define queue_next(__queue) \
 518         &(__queue)[1]
 519
 520 /**
 521  * queue_loop - Loop through the queues within a specific range (HELPER MACRO).
 522  * @__entry: Pointer where the current queue entry will be stored in.
 523  * @__start: Start queue pointer.
 524  * @__end: End queue pointer.
 525  *
 526  * This macro will loop through all queues between &__start and &__end.
 527  */
 528 #define queue_loop(__entry, __start, __end)                     \
 529         for ((__entry) = (__start);                             \
 530              prefetch(queue_next(__entry)), (__entry) != (__end);\
 531              (__entry) = queue_next(__entry))
 532
 533 /**
 534  * queue_for_each - Loop through all queues
 535  * @__dev: Pointer to &struct rt2x00_dev
 536  * @__entry: Pointer where the current queue entry will be stored in.
 537  *
 538  * This macro will loop through all available queues.
 539  */
 540 #define queue_for_each(__dev, __entry) \
 541         queue_loop(__entry, (__dev)->rx, queue_end(__dev))
 542
 543 /**
 544  * tx_queue_for_each - Loop through the TX queues
 545  * @__dev: Pointer to &struct rt2x00_dev
 546  * @__entry: Pointer where the current queue entry will be stored in.
 547  *
 548  * This macro will loop through all TX related queues excluding
 549  * the Beacon and Atim queues.
 550  */
 551 #define tx_queue_for_each(__dev, __entry) \
 552         queue_loop(__entry, (__dev)->tx, tx_queue_end(__dev))
 553
 554 /**
 555  * txall_queue_for_each - Loop through all TX related queues
 556  * @__dev: Pointer to &struct rt2x00_dev
 557  * @__entry: Pointer where the current queue entry will be stored in.
 558  *
 559  * This macro will loop through all TX related queues including
 560  * the Beacon and Atim queues.
 561  */
 562 #define txall_queue_for_each(__dev, __entry) \
 563         queue_loop(__entry, (__dev)->tx, queue_end(__dev))
 564
 565 /**
 566  * rt2x00queue_for_each_entry - Loop through all entries in the queue
 567  * @queue: Pointer to @data_queue
 568  * @start: &enum queue_index Pointer to start index
 569  * @end: &enum queue_index Pointer to end index
 570  * @data: Data to pass to the callback function
 571  * @fn: The function to call for each &struct queue_entry
 572  *
 573  * This will walk through all entries in the queue, in chronological
 574  * order. This means it will start at the current @start pointer
 575  * and will walk through the queue until it reaches the @end pointer.
 576  *
 577  * If fn returns true for an entry rt2x00queue_for_each_entry will stop
 578  * processing and return true as well.
 579  */
 580 bool rt2x00queue_for_each_entry(struct data_queue *queue,
 581                                 enum queue_index start,
 582                                 enum queue_index end,
 583                                 void *data,
 584                                 bool (*fn)(struct queue_entry *entry,
 585                                            void *data));
 586
 587 /**
 588  * rt2x00queue_empty - Check if the queue is empty.
 589  * @queue: Queue to check if empty.
 590  */
 591 static inline int rt2x00queue_empty(struct data_queue *queue)
 592 {
 593         return queue->length == 0;
 594 }
 595
 596 /**
 597  * rt2x00queue_full - Check if the queue is full.
 598  * @queue: Queue to check if full.
 599  */
 600 static inline int rt2x00queue_full(struct data_queue *queue)
 601 {
 602         return queue->length == queue->limit;
 603 }
 604
 605 /**
 606  * rt2x00queue_free - Check the number of available entries in queue.
 607  * @queue: Queue to check.
 608  */
 609 static inline int rt2x00queue_available(struct data_queue *queue)
 610 {
 611         return queue->limit - queue->length;
 612 }
 613
 614 /**
 615  * rt2x00queue_threshold - Check if the queue is below threshold
 616  * @queue: Queue to check.
 617  */
 618 static inline int rt2x00queue_threshold(struct data_queue *queue)
 619 {
 620         return rt2x00queue_available(queue) < queue->threshold;
 621 }
 622 /**
 623  * rt2x00queue_dma_timeout - Check if a timeout occurred for DMA transfers
 624  * @entry: Queue entry to check.
 625  */
 626 static inline int rt2x00queue_dma_timeout(struct queue_entry *entry)
 627 {
 628         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 629                 return false;
 630         return time_after(jiffies, entry->last_action + msecs_to_jiffies(100));
 631 }
 632
 633 /**
 634  * _rt2x00_desc_read - Read a word from the hardware descriptor.
 635  * @desc: Base descriptor address
 636  * @word: Word index from where the descriptor should be read.
 637  */
 638 static inline __le32 _rt2x00_desc_read(__le32 *desc, const u8 word)
 639 {
 640         return desc[word];
 641 }
 642
 643 /**
 644  * rt2x00_desc_read - Read a word from the hardware descriptor, this
 645  * function will take care of the byte ordering.
 646  * @desc: Base descriptor address
 647  * @word: Word index from where the descriptor should be read.
 648  */
 649 static inline u32 rt2x00_desc_read(__le32 *desc, const u8 word)
 650 {
 651         return le32_to_cpu(_rt2x00_desc_read(desc, word));
 652 }
 653
 654 /**
 655  * rt2x00_desc_write - write a word to the hardware descriptor, this
 656  * function will take care of the byte ordering.
 657  * @desc: Base descriptor address
 658  * @word: Word index from where the descriptor should be written.
 659  * @value: Value that should be written into the descriptor.
 660  */
 661 static inline void _rt2x00_desc_write(__le32 *desc, const u8 word, __le32 value)
 662 {
 663         desc[word] = value;
 664 }
 665
 666 /**
 667  * rt2x00_desc_write - write a word to the hardware descriptor.
 668  * @desc: Base descriptor address
 669  * @word: Word index from where the descriptor should be written.
 670  * @value: Value that should be written into the descriptor.
 671  */
 672 static inline void rt2x00_desc_write(__le32 *desc, const u8 word, u32 value)
 673 {
 674         _rt2x00_desc_write(desc, word, cpu_to_le32(value));
 675 }
 676
 677 #endif /* RT2X00QUEUE_H */