Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 677 insertions, 0 deletions

diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00queue.h b/drivers/net/wireless/ralink/rt2x00/rt2x00queue.h
new file mode 100644
index 000000000..23739dd0b
--- /dev/null
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00queue.h
@@ -0,0 +1,677 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+	Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
+	<http://rt2x00.serialmonkey.com>
+
+ */
+
+/*
+	Module: rt2x00
+	Abstract: rt2x00 queue datastructures and routines
+ */
+
+#ifndef RT2X00QUEUE_H
+#define RT2X00QUEUE_H
+
+#include <linux/prefetch.h>
+
+/**
+ * DOC: Entry frame size
+ *
+ * Ralink PCI devices demand the Frame size to be a multiple of 128 bytes,
+ * for USB devices this restriction does not apply, but the value of
+ * 2432 makes sense since it is big enough to contain the maximum fragment
+ * size according to the ieee802.11 specs.
+ * The aggregation size depends on support from the driver, but should
+ * be something around 3840 bytes.
+ */
+#define DATA_FRAME_SIZE		2432
+#define MGMT_FRAME_SIZE		256
+#define AGGREGATION_SIZE	3840
+
+/**
+ * enum data_queue_qid: Queue identification
+ *
+ * @QID_AC_VO: AC VO queue
+ * @QID_AC_VI: AC VI queue
+ * @QID_AC_BE: AC BE queue
+ * @QID_AC_BK: AC BK queue
+ * @QID_HCCA: HCCA queue
+ * @QID_MGMT: MGMT queue (prio queue)
+ * @QID_RX: RX queue
+ * @QID_OTHER: None of the above (don't use, only present for completeness)
+ * @QID_BEACON: Beacon queue (value unspecified, don't send it to device)
+ * @QID_ATIM: Atim queue (value unspecified, don't send it to device)
+ */
+enum data_queue_qid {
+	QID_AC_VO = 0,
+	QID_AC_VI = 1,
+	QID_AC_BE = 2,
+	QID_AC_BK = 3,
+	QID_HCCA = 4,
+	QID_MGMT = 13,
+	QID_RX = 14,
+	QID_OTHER = 15,
+	QID_BEACON,
+	QID_ATIM,
+};
+
+/**
+ * enum skb_frame_desc_flags: Flags for &struct skb_frame_desc
+ *
+ * @SKBDESC_DMA_MAPPED_RX: &skb_dma field has been mapped for RX
+ * @SKBDESC_DMA_MAPPED_TX: &skb_dma field has been mapped for TX
+ * @SKBDESC_IV_STRIPPED: Frame contained a IV/EIV provided by
+ *	mac80211 but was stripped for processing by the driver.
+ * @SKBDESC_NOT_MAC80211: Frame didn't originate from mac80211,
+ *	don't try to pass it back.
+ * @SKBDESC_DESC_IN_SKB: The descriptor is at the start of the
+ *	skb, instead of in the desc field.
+ */
+enum skb_frame_desc_flags {
+	SKBDESC_DMA_MAPPED_RX = 1 << 0,
+	SKBDESC_DMA_MAPPED_TX = 1 << 1,
+	SKBDESC_IV_STRIPPED = 1 << 2,
+	SKBDESC_NOT_MAC80211 = 1 << 3,
+	SKBDESC_DESC_IN_SKB = 1 << 4,
+};
+
+/**
+ * struct skb_frame_desc: Descriptor information for the skb buffer
+ *
+ * This structure is placed over the driver_data array, this means that
+ * this structure should not exceed the size of that array (40 bytes).
+ *
+ * @flags: Frame flags, see &enum skb_frame_desc_flags.
+ * @desc_len: Length of the frame descriptor.
+ * @tx_rate_idx: the index of the TX rate, used for TX status reporting
+ * @tx_rate_flags: the TX rate flags, used for TX status reporting
+ * @desc: Pointer to descriptor part of the frame.
+ *	Note that this pointer could point to something outside
+ *	of the scope of the skb->data pointer.
+ * @iv: IV/EIV data used during encryption/decryption.
+ * @skb_dma: (PCI-only) the DMA address associated with the sk buffer.
+ * @sta: The station where sk buffer was sent.
+ */
+struct skb_frame_desc {
+	u8 flags;
+
+	u8 desc_len;
+	u8 tx_rate_idx;
+	u8 tx_rate_flags;
+
+	void *desc;
+
+	__le32 iv[2];
+
+	dma_addr_t skb_dma;
+	struct ieee80211_sta *sta;
+};
+
+/**
+ * get_skb_frame_desc - Obtain the rt2x00 frame descriptor from a sk_buff.
+ * @skb: &struct sk_buff from where we obtain the &struct skb_frame_desc
+ */
+static inline struct skb_frame_desc* get_skb_frame_desc(struct sk_buff *skb)
+{
+	BUILD_BUG_ON(sizeof(struct skb_frame_desc) >
+		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE);
+	return (struct skb_frame_desc *)&IEEE80211_SKB_CB(skb)->driver_data;
+}
+
+/**
+ * enum rxdone_entry_desc_flags: Flags for &struct rxdone_entry_desc
+ *
+ * @RXDONE_SIGNAL_PLCP: Signal field contains the plcp value.
+ * @RXDONE_SIGNAL_BITRATE: Signal field contains the bitrate value.
+ * @RXDONE_SIGNAL_MCS: Signal field contains the mcs value.
+ * @RXDONE_MY_BSS: Does this frame originate from device's BSS.
+ * @RXDONE_CRYPTO_IV: Driver provided IV/EIV data.
+ * @RXDONE_CRYPTO_ICV: Driver provided ICV data.
+ * @RXDONE_L2PAD: 802.11 payload has been padded to 4-byte boundary.
+ */
+enum rxdone_entry_desc_flags {
+	RXDONE_SIGNAL_PLCP = BIT(0),
+	RXDONE_SIGNAL_BITRATE = BIT(1),
+	RXDONE_SIGNAL_MCS = BIT(2),
+	RXDONE_MY_BSS = BIT(3),
+	RXDONE_CRYPTO_IV = BIT(4),
+	RXDONE_CRYPTO_ICV = BIT(5),
+	RXDONE_L2PAD = BIT(6),
+};
+
+/**
+ * RXDONE_SIGNAL_MASK - Define to mask off all &rxdone_entry_desc_flags flags
+ * except for the RXDONE_SIGNAL_* flags. This is useful to convert the dev_flags
+ * from &rxdone_entry_desc to a signal value type.
+ */
+#define RXDONE_SIGNAL_MASK \
+	( RXDONE_SIGNAL_PLCP | RXDONE_SIGNAL_BITRATE | RXDONE_SIGNAL_MCS )
+
+/**
+ * struct rxdone_entry_desc: RX Entry descriptor
+ *
+ * Summary of information that has been read from the RX frame descriptor.
+ *
+ * @timestamp: RX Timestamp
+ * @signal: Signal of the received frame.
+ * @rssi: RSSI of the received frame.
+ * @size: Data size of the received frame.
+ * @flags: MAC80211 receive flags (See &enum mac80211_rx_flags).
+ * @dev_flags: Ralink receive flags (See &enum rxdone_entry_desc_flags).
+ * @rate_mode: Rate mode (See @enum rate_modulation).
+ * @cipher: Cipher type used during decryption.
+ * @cipher_status: Decryption status.
+ * @iv: IV/EIV data used during decryption.
+ * @icv: ICV data used during decryption.
+ */
+struct rxdone_entry_desc {
+	u64 timestamp;
+	int signal;
+	int rssi;
+	int size;
+	int flags;
+	int dev_flags;
+	u16 rate_mode;
+	u16 enc_flags;
+	enum mac80211_rx_encoding encoding;
+	enum rate_info_bw bw;
+	u8 cipher;
+	u8 cipher_status;
+
+	__le32 iv[2];
+	__le32 icv;
+};
+
+/**
+ * enum txdone_entry_desc_flags: Flags for &struct txdone_entry_desc
+ *
+ * Every txdone report has to contain the basic result of the
+ * transmission, either &TXDONE_UNKNOWN, &TXDONE_SUCCESS or
+ * &TXDONE_FAILURE. The flag &TXDONE_FALLBACK can be used in
+ * conjunction with all of these flags but should only be set
+ * if retires > 0. The flag &TXDONE_EXCESSIVE_RETRY can only be used
+ * in conjunction with &TXDONE_FAILURE.
+ *
+ * @TXDONE_UNKNOWN: Hardware could not determine success of transmission.
+ * @TXDONE_SUCCESS: Frame was successfully send
+ * @TXDONE_FALLBACK: Hardware used fallback rates for retries
+ * @TXDONE_FAILURE: Frame was not successfully send
+ * @TXDONE_EXCESSIVE_RETRY: In addition to &TXDONE_FAILURE, the
+ *	frame transmission failed due to excessive retries.
+ */
+enum txdone_entry_desc_flags {
+	TXDONE_UNKNOWN,
+	TXDONE_SUCCESS,
+	TXDONE_FALLBACK,
+	TXDONE_FAILURE,
+	TXDONE_EXCESSIVE_RETRY,
+	TXDONE_AMPDU,
+	TXDONE_NO_ACK_REQ,
+};
+
+/**
+ * struct txdone_entry_desc: TX done entry descriptor
+ *
+ * Summary of information that has been read from the TX frame descriptor
+ * after the device is done with transmission.
+ *
+ * @flags: TX done flags (See &enum txdone_entry_desc_flags).
+ * @retry: Retry count.
+ */
+struct txdone_entry_desc {
+	unsigned long flags;
+	int retry;
+};
+
+/**
+ * enum txentry_desc_flags: Status flags for TX entry descriptor
+ *
+ * @ENTRY_TXD_RTS_FRAME: This frame is a RTS frame.
+ * @ENTRY_TXD_CTS_FRAME: This frame is a CTS-to-self frame.
+ * @ENTRY_TXD_GENERATE_SEQ: This frame requires sequence counter.
+ * @ENTRY_TXD_FIRST_FRAGMENT: This is the first frame.
+ * @ENTRY_TXD_MORE_FRAG: This frame is followed by another fragment.
+ * @ENTRY_TXD_REQ_TIMESTAMP: Require timestamp to be inserted.
+ * @ENTRY_TXD_BURST: This frame belongs to the same burst event.
+ * @ENTRY_TXD_ACK: An ACK is required for this frame.
+ * @ENTRY_TXD_RETRY_MODE: When set, the long retry count is used.
+ * @ENTRY_TXD_ENCRYPT: This frame should be encrypted.
+ * @ENTRY_TXD_ENCRYPT_PAIRWISE: Use pairwise key table (instead of shared).
+ * @ENTRY_TXD_ENCRYPT_IV: Generate IV/EIV in hardware.
+ * @ENTRY_TXD_ENCRYPT_MMIC: Generate MIC in hardware.
+ * @ENTRY_TXD_HT_AMPDU: This frame is part of an AMPDU.
+ * @ENTRY_TXD_HT_BW_40: Use 40MHz Bandwidth.
+ * @ENTRY_TXD_HT_SHORT_GI: Use short GI.
+ * @ENTRY_TXD_HT_MIMO_PS: The receiving STA is in dynamic SM PS mode.
+ */
+enum txentry_desc_flags {
+	ENTRY_TXD_RTS_FRAME,
+	ENTRY_TXD_CTS_FRAME,
+	ENTRY_TXD_GENERATE_SEQ,
+	ENTRY_TXD_FIRST_FRAGMENT,
+	ENTRY_TXD_MORE_FRAG,
+	ENTRY_TXD_REQ_TIMESTAMP,
+	ENTRY_TXD_BURST,
+	ENTRY_TXD_ACK,
+	ENTRY_TXD_RETRY_MODE,
+	ENTRY_TXD_ENCRYPT,
+	ENTRY_TXD_ENCRYPT_PAIRWISE,
+	ENTRY_TXD_ENCRYPT_IV,
+	ENTRY_TXD_ENCRYPT_MMIC,
+	ENTRY_TXD_HT_AMPDU,
+	ENTRY_TXD_HT_BW_40,
+	ENTRY_TXD_HT_SHORT_GI,
+	ENTRY_TXD_HT_MIMO_PS,
+};
+
+/**
+ * struct txentry_desc: TX Entry descriptor
+ *
+ * Summary of information for the frame descriptor before sending a TX frame.
+ *
+ * @flags: Descriptor flags (See &enum queue_entry_flags).
+ * @length: Length of the entire frame.
+ * @header_length: Length of 802.11 header.
+ * @length_high: PLCP length high word.
+ * @length_low: PLCP length low word.
+ * @signal: PLCP signal.
+ * @service: PLCP service.
+ * @msc: MCS.
+ * @stbc: Use Space Time Block Coding (only available for MCS rates < 8).
+ * @ba_size: Size of the recepients RX reorder buffer - 1.
+ * @rate_mode: Rate mode (See @enum rate_modulation).
+ * @mpdu_density: MDPU density.
+ * @retry_limit: Max number of retries.
+ * @ifs: IFS value.
+ * @txop: IFS value for 11n capable chips.
+ * @cipher: Cipher type used for encryption.
+ * @key_idx: Key index used for encryption.
+ * @iv_offset: Position where IV should be inserted by hardware.
+ * @iv_len: Length of IV data.
+ */
+struct txentry_desc {
+	unsigned long flags;
+
+	u16 length;
+	u16 header_length;
+
+	union {
+		struct {
+			u16 length_high;
+			u16 length_low;
+			u16 signal;
+			u16 service;
+			enum ifs ifs;
+		} plcp;
+
+		struct {
+			u16 mcs;
+			u8 stbc;
+			u8 ba_size;
+			u8 mpdu_density;
+			enum txop txop;
+			int wcid;
+		} ht;
+	} u;
+
+	enum rate_modulation rate_mode;
+
+	short retry_limit;
+
+	enum cipher cipher;
+	u16 key_idx;
+	u16 iv_offset;
+	u16 iv_len;
+};
+
+/**
+ * enum queue_entry_flags: Status flags for queue entry
+ *
+ * @ENTRY_BCN_ASSIGNED: This entry has been assigned to an interface.
+ *	As long as this bit is set, this entry may only be touched
+ *	through the interface structure.
+ * @ENTRY_OWNER_DEVICE_DATA: This entry is owned by the device for data
+ *	transfer (either TX or RX depending on the queue). The entry should
+ *	only be touched after the device has signaled it is done with it.
+ * @ENTRY_DATA_PENDING: This entry contains a valid frame and is waiting
+ *	for the signal to start sending.
+ * @ENTRY_DATA_IO_FAILED: Hardware indicated that an IO error occurred
+ *	while transferring the data to the hardware. No TX status report will
+ *	be expected from the hardware.
+ * @ENTRY_DATA_STATUS_PENDING: The entry has been send to the device and
+ *	returned. It is now waiting for the status reporting before the
+ *	entry can be reused again.
+ */
+enum queue_entry_flags {
+	ENTRY_BCN_ASSIGNED,
+	ENTRY_BCN_ENABLED,
+	ENTRY_OWNER_DEVICE_DATA,
+	ENTRY_DATA_PENDING,
+	ENTRY_DATA_IO_FAILED,
+	ENTRY_DATA_STATUS_PENDING,
+};
+
+/**
+ * struct queue_entry: Entry inside the &struct data_queue
+ *
+ * @flags: Entry flags, see &enum queue_entry_flags.
+ * @last_action: Timestamp of last change.
+ * @queue: The data queue (&struct data_queue) to which this entry belongs.
+ * @skb: The buffer which is currently being transmitted (for TX queue),
+ *	or used to directly receive data in (for RX queue).
+ * @entry_idx: The entry index number.
+ * @priv_data: Private data belonging to this queue entry. The pointer
+ *	points to data specific to a particular driver and queue type.
+ * @status: Device specific status
+ */
+struct queue_entry {
+	unsigned long flags;
+	unsigned long last_action;
+
+	struct data_queue *queue;
+
+	struct sk_buff *skb;
+
+	unsigned int entry_idx;
+
+	void *priv_data;
+};
+
+/**
+ * enum queue_index: Queue index type
+ *
+ * @Q_INDEX: Index pointer to the current entry in the queue, if this entry is
+ *	owned by the hardware then the queue is considered to be full.
+ * @Q_INDEX_DMA_DONE: Index pointer for the next entry which will have been
+ *	transferred to the hardware.
+ * @Q_INDEX_DONE: Index pointer to the next entry which will be completed by
+ *	the hardware and for which we need to run the txdone handler. If this
+ *	entry is not owned by the hardware the queue is considered to be empty.
+ * @Q_INDEX_MAX: Keep last, used in &struct data_queue to determine the size
+ *	of the index array.
+ */
+enum queue_index {
+	Q_INDEX,
+	Q_INDEX_DMA_DONE,
+	Q_INDEX_DONE,
+	Q_INDEX_MAX,
+};
+
+/**
+ * enum data_queue_flags: Status flags for data queues
+ *
+ * @QUEUE_STARTED: The queue has been started. Fox RX queues this means the
+ *	device might be DMA'ing skbuffers. TX queues will accept skbuffers to
+ *	be transmitted and beacon queues will start beaconing the configured
+ *	beacons.
+ * @QUEUE_PAUSED: The queue has been started but is currently paused.
+ *	When this bit is set, the queue has been stopped in mac80211,
+ *	preventing new frames to be enqueued. However, a few frames
+ *	might still appear shortly after the pausing...
+ */
+enum data_queue_flags {
+	QUEUE_STARTED,
+	QUEUE_PAUSED,
+};
+
+/**
+ * struct data_queue: Data queue
+ *
+ * @rt2x00dev: Pointer to main &struct rt2x00dev where this queue belongs to.
+ * @entries: Base address of the &struct queue_entry which are
+ *	part of this queue.
+ * @qid: The queue identification, see &enum data_queue_qid.
+ * @flags: Entry flags, see &enum queue_entry_flags.
+ * @status_lock: The mutex for protecting the start/stop/flush
+ *	handling on this queue.
+ * @tx_lock: Spinlock to serialize tx operations on this queue.
+ * @index_lock: Spinlock to protect index handling. Whenever @index, @index_done or
+ *	@index_crypt needs to be changed this lock should be grabbed to prevent
+ *	index corruption due to concurrency.
+ * @count: Number of frames handled in the queue.
+ * @limit: Maximum number of entries in the queue.
+ * @threshold: Minimum number of free entries before queue is kicked by force.
+ * @length: Number of frames in queue.
+ * @index: Index pointers to entry positions in the queue,
+ *	use &enum queue_index to get a specific index field.
+ * @wd_count: watchdog counter number of times entry does change
+ *      in the queue
+ * @wd_idx: index of queue entry saved by watchdog
+ * @txop: maximum burst time.
+ * @aifs: The aifs value for outgoing frames (field ignored in RX queue).
+ * @cw_min: The cw min value for outgoing frames (field ignored in RX queue).
+ * @cw_max: The cw max value for outgoing frames (field ignored in RX queue).
+ * @data_size: Maximum data size for the frames in this queue.
+ * @desc_size: Hardware descriptor size for the data in this queue.
+ * @priv_size: Size of per-queue_entry private data.
+ * @usb_endpoint: Device endpoint used for communication (USB only)
+ * @usb_maxpacket: Max packet size for given endpoint (USB only)
+ */
+struct data_queue {
+	struct rt2x00_dev *rt2x00dev;
+	struct queue_entry *entries;
+
+	enum data_queue_qid qid;
+	unsigned long flags;
+
+	struct mutex status_lock;
+	spinlock_t tx_lock;
+	spinlock_t index_lock;
+
+	unsigned int count;
+	unsigned short limit;
+	unsigned short threshold;
+	unsigned short length;
+	unsigned short index[Q_INDEX_MAX];
+
+	unsigned short wd_count;
+	unsigned int wd_idx;
+
+	unsigned short txop;
+	unsigned short aifs;
+	unsigned short cw_min;
+	unsigned short cw_max;
+
+	unsigned short data_size;
+	unsigned char  desc_size;
+	unsigned char  winfo_size;
+	unsigned short priv_size;
+
+	unsigned short usb_endpoint;
+	unsigned short usb_maxpacket;
+};
+
+/**
+ * queue_end - Return pointer to the last queue (HELPER MACRO).
+ * @__dev: Pointer to &struct rt2x00_dev
+ *
+ * Using the base rx pointer and the maximum number of available queues,
+ * this macro will return the address of 1 position beyond  the end of the
+ * queues array.
+ */
+#define queue_end(__dev) \
+	&(__dev)->rx[(__dev)->data_queues]
+
+/**
+ * tx_queue_end - Return pointer to the last TX queue (HELPER MACRO).
+ * @__dev: Pointer to &struct rt2x00_dev
+ *
+ * Using the base tx pointer and the maximum number of available TX
+ * queues, this macro will return the address of 1 position beyond
+ * the end of the TX queue array.
+ */
+#define tx_queue_end(__dev) \
+	&(__dev)->tx[(__dev)->ops->tx_queues]
+
+/**
+ * queue_next - Return pointer to next queue in list (HELPER MACRO).
+ * @__queue: Current queue for which we need the next queue
+ *
+ * Using the current queue address we take the address directly
+ * after the queue to take the next queue. Note that this macro
+ * should be used carefully since it does not protect against
+ * moving past the end of the list. (See macros &queue_end and
+ * &tx_queue_end for determining the end of the queue).
+ */
+#define queue_next(__queue) \
+	&(__queue)[1]
+
+/**
+ * queue_loop - Loop through the queues within a specific range (HELPER MACRO).
+ * @__entry: Pointer where the current queue entry will be stored in.
+ * @__start: Start queue pointer.
+ * @__end: End queue pointer.
+ *
+ * This macro will loop through all queues between &__start and &__end.
+ */
+#define queue_loop(__entry, __start, __end)			\
+	for ((__entry) = (__start);				\
+	     prefetch(queue_next(__entry)), (__entry) != (__end);\
+	     (__entry) = queue_next(__entry))
+
+/**
+ * queue_for_each - Loop through all queues
+ * @__dev: Pointer to &struct rt2x00_dev
+ * @__entry: Pointer where the current queue entry will be stored in.
+ *
+ * This macro will loop through all available queues.
+ */
+#define queue_for_each(__dev, __entry) \
+	queue_loop(__entry, (__dev)->rx, queue_end(__dev))
+
+/**
+ * tx_queue_for_each - Loop through the TX queues
+ * @__dev: Pointer to &struct rt2x00_dev
+ * @__entry: Pointer where the current queue entry will be stored in.
+ *
+ * This macro will loop through all TX related queues excluding
+ * the Beacon and Atim queues.
+ */
+#define tx_queue_for_each(__dev, __entry) \
+	queue_loop(__entry, (__dev)->tx, tx_queue_end(__dev))
+
+/**
+ * txall_queue_for_each - Loop through all TX related queues
+ * @__dev: Pointer to &struct rt2x00_dev
+ * @__entry: Pointer where the current queue entry will be stored in.
+ *
+ * This macro will loop through all TX related queues including
+ * the Beacon and Atim queues.
+ */
+#define txall_queue_for_each(__dev, __entry) \
+	queue_loop(__entry, (__dev)->tx, queue_end(__dev))
+
+/**
+ * rt2x00queue_for_each_entry - Loop through all entries in the queue
+ * @queue: Pointer to @data_queue
+ * @start: &enum queue_index Pointer to start index
+ * @end: &enum queue_index Pointer to end index
+ * @data: Data to pass to the callback function
+ * @fn: The function to call for each &struct queue_entry
+ *
+ * This will walk through all entries in the queue, in chronological
+ * order. This means it will start at the current @start pointer
+ * and will walk through the queue until it reaches the @end pointer.
+ *
+ * If fn returns true for an entry rt2x00queue_for_each_entry will stop
+ * processing and return true as well.
+ */
+bool rt2x00queue_for_each_entry(struct data_queue *queue,
+				enum queue_index start,
+				enum queue_index end,
+				void *data,
+				bool (*fn)(struct queue_entry *entry,
+					   void *data));
+
+/**
+ * rt2x00queue_empty - Check if the queue is empty.
+ * @queue: Queue to check if empty.
+ */
+static inline int rt2x00queue_empty(struct data_queue *queue)
+{
+	return queue->length == 0;
+}
+
+/**
+ * rt2x00queue_full - Check if the queue is full.
+ * @queue: Queue to check if full.
+ */
+static inline int rt2x00queue_full(struct data_queue *queue)
+{
+	return queue->length == queue->limit;
+}
+
+/**
+ * rt2x00queue_free - Check the number of available entries in queue.
+ * @queue: Queue to check.
+ */
+static inline int rt2x00queue_available(struct data_queue *queue)
+{
+	return queue->limit - queue->length;
+}
+
+/**
+ * rt2x00queue_threshold - Check if the queue is below threshold
+ * @queue: Queue to check.
+ */
+static inline int rt2x00queue_threshold(struct data_queue *queue)
+{
+	return rt2x00queue_available(queue) < queue->threshold;
+}
+/**
+ * rt2x00queue_dma_timeout - Check if a timeout occurred for DMA transfers
+ * @entry: Queue entry to check.
+ */
+static inline int rt2x00queue_dma_timeout(struct queue_entry *entry)
+{
+	if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
+		return false;
+	return time_after(jiffies, entry->last_action + msecs_to_jiffies(100));
+}
+
+/**
+ * _rt2x00_desc_read - Read a word from the hardware descriptor.
+ * @desc: Base descriptor address
+ * @word: Word index from where the descriptor should be read.
+ */
+static inline __le32 _rt2x00_desc_read(__le32 *desc, const u8 word)
+{
+	return desc[word];
+}
+
+/**
+ * rt2x00_desc_read - Read a word from the hardware descriptor, this
+ * function will take care of the byte ordering.
+ * @desc: Base descriptor address
+ * @word: Word index from where the descriptor should be read.
+ */
+static inline u32 rt2x00_desc_read(__le32 *desc, const u8 word)
+{
+	return le32_to_cpu(_rt2x00_desc_read(desc, word));
+}
+
+/**
+ * rt2x00_desc_write - write a word to the hardware descriptor, this
+ * function will take care of the byte ordering.
+ * @desc: Base descriptor address
+ * @word: Word index from where the descriptor should be written.
+ * @value: Value that should be written into the descriptor.
+ */
+static inline void _rt2x00_desc_write(__le32 *desc, const u8 word, __le32 value)
+{
+	desc[word] = value;
+}
+
+/**
+ * rt2x00_desc_write - write a word to the hardware descriptor.
+ * @desc: Base descriptor address
+ * @word: Word index from where the descriptor should be written.
+ * @value: Value that should be written into the descriptor.
+ */
+static inline void rt2x00_desc_write(__le32 *desc, const u8 word, u32 value)
+{
+	_rt2x00_desc_write(desc, word, cpu_to_le32(value));
+}
+
+#endif /* RT2X00QUEUE_H */