/* Copyright (C) 2004 - 2008 rt2x00 SourceForge Project 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 /** * 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 * * After research it was concluded that 12 entries in a RX and TX * queue would be sufficient. Although this is almost one third of * the amount the legacy driver allocated, the queues aren't getting * filled to the maximum even when working with the maximum rate. */ #define RX_ENTRIES 12 #define TX_ENTRIES 12 #define BEACON_ENTRIES 1 #define ATIM_ENTRIES 1 /** * 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 * */ //enum skb_frame_desc_flags { // TEMPORARILY EMPTY //}; /** * 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. * @data: Pointer to data part of frame (Start of ieee80211 header). * @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. * @data_len: Length of the frame data. * @desc_len: Length of the frame descriptor. * @entry: The entry to which this sk buffer belongs. */ struct skb_frame_desc { unsigned int flags; unsigned short data_len; unsigned short desc_len; void *data; void *desc; 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. * * @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 { 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 = 1 << 0, TXDONE_SUCCESS = 1 << 1, TXDONE_FAILURE = 1 << 2, TXDONE_EXCESSIVE_RETRY = 1 << 3, }; /** * 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_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_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 */