drivers/net/wireless/rt2x00/rt2x00queue.h - kernel/msm-4.19 - Gitiles

 /*
 	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
 	<http://rt2x00.serialmonkey.com>

 	This program is free software; you can redistribute it and/or modify
 	it under the terms of the GNU General Public License as published by
 	the Free Software Foundation; either version 2 of the License, or
 	(at your option) any later version.

 	This program is distributed in the hope that it will be useful,
 	but WITHOUT ANY WARRANTY; without even the implied warranty of
 	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 	GNU General Public License for more details.

 	You should have received a copy of the GNU General Public License
 	along with this program; if not, write to the
 	Free Software Foundation, Inc.,
 	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */

 /*
 	Module: rt2x00
 	Abstract: rt2x00 queue datastructures and routines
  */

 #ifndef RT2X00QUEUE_H
 #define RT2X00QUEUE_H

 #include <linux/prefetch.h>

 /**
  * DOC: Entrie 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.
  */
 #define DATA_FRAME_SIZE	2432
 #define MGMT_FRAME_SIZE	256

 /**
  * DOC: Number of entries per queue
  *
  * Under normal load without fragmentation 12 entries are sufficient
  * without the queue being filled up to the maximum. When using fragmentation
  * and the queue threshold code we need to add some additional margins to
  * make sure the queue will never (or only under extreme load) fill up
  * completely.
  * Since we don't use preallocated DMA having a large number of queue entries
  * will have only minimal impact on the memory requirements for the queue.
  */
 #define RX_ENTRIES	24
 #define TX_ENTRIES	24
 #define BEACON_ENTRIES	1
 #define ATIM_ENTRIES	8

 /**
  * enum data_queue_qid: Queue identification
  *
  * @QID_AC_BE: AC BE queue
  * @QID_AC_BK: AC BK queue
  * @QID_AC_VI: AC VI queue
  * @QID_AC_VO: AC VO 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 unspeficied, don't send it to device)
  */
 enum data_queue_qid {
 	QID_AC_BE = 0,
 	QID_AC_BK = 1,
 	QID_AC_VI = 2,
 	QID_AC_VO = 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
  */
 enum skb_frame_desc_flags {
 	SKBDESC_DMA_MAPPED_RX = (1 << 0),
 	SKBDESC_DMA_MAPPED_TX = (1 << 1),
 };

 /**
  * 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.
  * @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.
  * @skb_dma: (PCI-only) the DMA address associated with the sk buffer.
  * @entry: The entry to which this sk buffer belongs.
  */
 struct skb_frame_desc {
 	unsigned int flags;

 	unsigned int desc_len;
 	void *desc;

 	dma_addr_t skb_dma;

 	struct queue_entry *entry;
 };

 /**
  * 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: Does the signal field contain the plcp value,
  *	or does it contain the bitrate itself.
  * @RXDONE_MY_BSS: Does this frame originate from device's BSS.
  */
 enum rxdone_entry_desc_flags {
 	RXDONE_SIGNAL_PLCP = 1 << 0,
 	RXDONE_MY_BSS = 1 << 1,
 };

 /**
  * 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).

  */
 struct rxdone_entry_desc {
 	u64 timestamp;
 	int signal;
 	int rssi;
 	int size;
 	int flags;
 	int dev_flags;
 };

 /**
  * enum txdone_entry_desc_flags: Flags for &struct txdone_entry_desc
  *
  * @TXDONE_UNKNOWN: Hardware could not determine success of transmission.
  * @TXDONE_SUCCESS: Frame was successfully send
  * @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_FAILURE,
 	TXDONE_EXCESSIVE_RETRY,
 };

 /**
  * 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_OFDM_RATE: This frame is send out with an OFDM rate.
  * @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.
  */
 enum txentry_desc_flags {
 	ENTRY_TXD_RTS_FRAME,
 	ENTRY_TXD_CTS_FRAME,
 	ENTRY_TXD_OFDM_RATE,
 	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,
 };

 /**
  * 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).
  * @queue: Queue identification (See &enum data_queue_qid).
  * @length_high: PLCP length high word.
  * @length_low: PLCP length low word.
  * @signal: PLCP signal.
  * @service: PLCP service.
  * @retry_limit: Max number of retries.
  * @aifs: AIFS value.
  * @ifs: IFS value.
  * @cw_min: cwmin value.
  * @cw_max: cwmax value.
  */
 struct txentry_desc {
 	unsigned long flags;

 	enum data_queue_qid queue;

 	u16 length_high;
 	u16 length_low;
 	u16 signal;
 	u16 service;

 	short retry_limit;
 	short aifs;
 	short ifs;
 	short cw_min;
 	short cw_max;
 };

 /**
  * 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_OWNER_DEVICE_CRYPTO: This entry is owned by the device for data
  *	encryption or decryption. 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.
  */
 enum queue_entry_flags {
 	ENTRY_BCN_ASSIGNED,
 	ENTRY_OWNER_DEVICE_DATA,
 	ENTRY_OWNER_DEVICE_CRYPTO,
 	ENTRY_DATA_PENDING,
 };

 /**
  * struct queue_entry: Entry inside the &struct data_queue
  *
  * @flags: Entry flags, see &enum queue_entry_flags.
  * @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 recieve 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.
  */
 struct queue_entry {
 	unsigned long flags;

 	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_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_CRYPTO: Index pointer to the next entry which encryption/decription
  *	will be completed by the hardware next.
  * @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_DONE,
 	Q_INDEX_CRYPTO,
 	Q_INDEX_MAX,
 };

 /**
  * 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.
  * @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.
  * @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.
  */
 struct data_queue {
 	struct rt2x00_dev *rt2x00dev;
 	struct queue_entry *entries;

 	enum data_queue_qid qid;

 	spinlock_t lock;
 	unsigned int count;
 	unsigned short limit;
 	unsigned short threshold;
 	unsigned short length;
 	unsigned short index[Q_INDEX_MAX];

 	unsigned short aifs;
 	unsigned short cw_min;
 	unsigned short cw_max;

 	unsigned short data_size;
 	unsigned short desc_size;
 };

 /**
  * struct data_queue_desc: Data queue description
  *
  * The information in this structure is used by drivers
  * to inform rt2x00lib about the creation of the data queue.
  *
  * @entry_num: Maximum number of entries for a 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.
  */
 struct data_queue_desc {
 	unsigned short entry_num;
 	unsigned short data_size;
 	unsigned short desc_size;
 	unsigned short priv_size;
 };

 /**
  * 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_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(&(__entry)[1]), (__entry) != (__end);	\
 	     (__entry) = &(__entry)[1])

 /**
  * 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_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;
 }

 /**
  * rt2x00_desc_read - Read a word from the hardware descriptor.
  * @desc: Base descriptor address
  * @word: Word index from where the descriptor should be read.
  * @value: Address where the descriptor value should be written into.
  */
 static inline void rt2x00_desc_read(__le32 *desc, const u8 word, u32 *value)
 {
 	*value = le32_to_cpu(desc[word]);
 }

 /**
  * rt2x00_desc_write - wrote 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)
 {
 	desc[word] = cpu_to_le32(value);
 }

 #endif /* RT2X00QUEUE_H */
	/*
	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
	<http://rt2x00.serialmonkey.com>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the
	Free Software Foundation, Inc.,
	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	*/

	/*
	Module: rt2x00
	Abstract: rt2x00 queue datastructures and routines
	*/

	#ifndef RT2X00QUEUE_H
	#define RT2X00QUEUE_H

	#include <linux/prefetch.h>

	/**
	* DOC: Entrie 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.
	*/
	#define DATA_FRAME_SIZE 2432
	#define MGMT_FRAME_SIZE 256

	/**
	* DOC: Number of entries per queue
	*
	* Under normal load without fragmentation 12 entries are sufficient
	* without the queue being filled up to the maximum. When using fragmentation
	* and the queue threshold code we need to add some additional margins to
	* make sure the queue will never (or only under extreme load) fill up
	* completely.
	* Since we don't use preallocated DMA having a large number of queue entries
	* will have only minimal impact on the memory requirements for the queue.
	*/
	#define RX_ENTRIES 24
	#define TX_ENTRIES 24
	#define BEACON_ENTRIES 1
	#define ATIM_ENTRIES 8

	/**
	* enum data_queue_qid: Queue identification
	*
	* @QID_AC_BE: AC BE queue
	* @QID_AC_BK: AC BK queue
	* @QID_AC_VI: AC VI queue
	* @QID_AC_VO: AC VO 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 unspeficied, don't send it to device)
	*/
	enum data_queue_qid {
	QID_AC_BE = 0,
	QID_AC_BK = 1,
	QID_AC_VI = 2,
	QID_AC_VO = 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
	*/
	enum skb_frame_desc_flags {
	SKBDESC_DMA_MAPPED_RX = (1 << 0),
	SKBDESC_DMA_MAPPED_TX = (1 << 1),
	};

	/**
	* 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.
	* @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.
	* @skb_dma: (PCI-only) the DMA address associated with the sk buffer.
	* @entry: The entry to which this sk buffer belongs.
	*/
	struct skb_frame_desc {
	unsigned int flags;

	unsigned int desc_len;
	void *desc;

	dma_addr_t skb_dma;

	struct queue_entry *entry;
	};

	/**
	* 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: Does the signal field contain the plcp value,
	* or does it contain the bitrate itself.
	* @RXDONE_MY_BSS: Does this frame originate from device's BSS.
	*/
	enum rxdone_entry_desc_flags {
	RXDONE_SIGNAL_PLCP = 1 << 0,
	RXDONE_MY_BSS = 1 << 1,
	};

	/**
	* 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).

	*/
	struct rxdone_entry_desc {
	u64 timestamp;
	int signal;
	int rssi;
	int size;
	int flags;
	int dev_flags;
	};

	/**
	* enum txdone_entry_desc_flags: Flags for &struct txdone_entry_desc
	*
	* @TXDONE_UNKNOWN: Hardware could not determine success of transmission.
	* @TXDONE_SUCCESS: Frame was successfully send
	* @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_FAILURE,
	TXDONE_EXCESSIVE_RETRY,
	};

	/**
	* 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_OFDM_RATE: This frame is send out with an OFDM rate.
	* @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.
	*/
	enum txentry_desc_flags {
	ENTRY_TXD_RTS_FRAME,
	ENTRY_TXD_CTS_FRAME,
	ENTRY_TXD_OFDM_RATE,
	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,
	};

	/**
	* 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).
	* @queue: Queue identification (See &enum data_queue_qid).
	* @length_high: PLCP length high word.
	* @length_low: PLCP length low word.
	* @signal: PLCP signal.
	* @service: PLCP service.
	* @retry_limit: Max number of retries.
	* @aifs: AIFS value.
	* @ifs: IFS value.
	* @cw_min: cwmin value.
	* @cw_max: cwmax value.
	*/
	struct txentry_desc {
	unsigned long flags;

	enum data_queue_qid queue;

	u16 length_high;
	u16 length_low;
	u16 signal;
	u16 service;

	short retry_limit;
	short aifs;
	short ifs;
	short cw_min;
	short cw_max;
	};

	/**
	* 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_OWNER_DEVICE_CRYPTO: This entry is owned by the device for data
	* encryption or decryption. 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.
	*/
	enum queue_entry_flags {
	ENTRY_BCN_ASSIGNED,
	ENTRY_OWNER_DEVICE_DATA,
	ENTRY_OWNER_DEVICE_CRYPTO,
	ENTRY_DATA_PENDING,
	};

	/**
	* struct queue_entry: Entry inside the &struct data_queue
	*
	* @flags: Entry flags, see &enum queue_entry_flags.
	* @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 recieve 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.
	*/
	struct queue_entry {
	unsigned long flags;

	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_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_CRYPTO: Index pointer to the next entry which encryption/decription
	* will be completed by the hardware next.
	* @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_DONE,
	Q_INDEX_CRYPTO,
	Q_INDEX_MAX,
	};

	/**
	* 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.
	* @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.
	* @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.
	*/
	struct data_queue {
	struct rt2x00_dev *rt2x00dev;
	struct queue_entry *entries;

	enum data_queue_qid qid;

	spinlock_t lock;
	unsigned int count;
	unsigned short limit;
	unsigned short threshold;
	unsigned short length;
	unsigned short index[Q_INDEX_MAX];

	unsigned short aifs;
	unsigned short cw_min;
	unsigned short cw_max;

	unsigned short data_size;
	unsigned short desc_size;
	};

	/**
	* struct data_queue_desc: Data queue description
	*
	* The information in this structure is used by drivers
	* to inform rt2x00lib about the creation of the data queue.
	*
	* @entry_num: Maximum number of entries for a 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.
	*/
	struct data_queue_desc {
	unsigned short entry_num;
	unsigned short data_size;
	unsigned short desc_size;
	unsigned short priv_size;
	};

	/**
	* 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_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(&(__entry)[1]), (__entry) != (__end); \
	(__entry) = &(__entry)[1])

	/**
	* 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_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;
	}

	/**
	* rt2x00_desc_read - Read a word from the hardware descriptor.
	* @desc: Base descriptor address
	* @word: Word index from where the descriptor should be read.
	* @value: Address where the descriptor value should be written into.
	*/
	static inline void rt2x00_desc_read(__le32 desc, const u8 word, u32 value)
	{
	*value = le32_to_cpu(desc[word]);
	}

	/**
	* rt2x00_desc_write - wrote 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)
	{
	desc[word] = cpu_to_le32(value);
	}

	#endif /* RT2X00QUEUE_H */