1 files changed, 435 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.h b/drivers/net/wireless/rt2x00/rt2x00queue.h
new file mode 100644
index 000000000000..507116c6c9fe
--- /dev/null
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.h
@@ -0,0 +1,435 @@
+/*
+        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
+ *
+ * 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.
+ *
+ * FIXME: For virtual interfaces we need a different number
+ * of beacons, since more interfaces require more beacons.
+ */
+#define RX_ENTRIES      12
+#define TX_ENTRIES      12
+#define BEACON_ENTRIES  1
+#define ATIM_ENTRIES    1
+
+/**
+ * enum data_queue_qid: Queue identification
+ */
+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,
+};
+
+/**
+ * struct skb_frame_desc: Descriptor information for the skb buffer
+ *
+ * This structure is placed over the skb->cb array, this means that
+ * this structure should not exceed the size of that array (48 bytes).
+ *
+ * @flags: Frame flags.
+ * @frame_type: Frame type, see &enum rt2x00_dump_type.
+ * @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 int frame_type;
+
+        void *data;
+        void *desc;
+
+        unsigned int data_len;
+        unsigned int desc_len;
+
+        struct queue_entry *entry;
+};
+
+static inline struct skb_frame_desc* get_skb_frame_desc(struct sk_buff *skb)
+{
+        BUILD_BUG_ON(sizeof(struct skb_frame_desc) > sizeof(skb->cb));
+        return (struct skb_frame_desc *)&skb->cb[0];
+}
+
+/**
+ * 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.
+ * @ofdm: Was frame send with an OFDM rate.
+ * @size: Data size of the received frame.
+ * @flags: MAC80211 receive flags (See &enum mac80211_rx_flags).
+ * @my_bss: Does this frame originate from device's BSS.
+ */
+struct rxdone_entry_desc {
+        int signal;
+        int rssi;
+        int ofdm;
+        int size;
+        int flags;
+        int my_bss;
+};
+
+/**
+ * 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.
+ *
+ * @control: Control structure which was used to transmit the frame.
+ * @status: TX status (See &enum tx_status).
+ * @retry: Retry count.
+ */
+struct txdone_entry_desc {
+        struct ieee80211_tx_control *control;
+        int status;
+        int retry;
+};
+
+/**
+ * enum txentry_desc_flags: Status flags for TX entry descriptor
+ *
+ * @ENTRY_TXD_RTS_FRAME: This frame is a RTS frame.
+ * @ENTRY_TXD_OFDM_RATE: This frame is send out with an OFDM rate.
+ * @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.
+ */
+enum txentry_desc_flags {
+        ENTRY_TXD_RTS_FRAME,
+        ENTRY_TXD_OFDM_RATE,
+        ENTRY_TXD_MORE_FRAG,
+        ENTRY_TXD_REQ_TIMESTAMP,
+        ENTRY_TXD_BURST,
+        ENTRY_TXD_ACK,
+};
+
+/**
+ * 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.
+ * @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;
+
+        int aifs;
+        int ifs;
+        int cw_min;
+        int 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.
+ */
+
+enum queue_entry_flags {
+        ENTRY_BCN_ASSIGNED,
+        ENTRY_OWNER_DEVICE_DATA,
+        ENTRY_OWNER_DEVICE_CRYPTO,
+};
+
+/**
+ * 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.
+ * @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 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)->hw->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;
+}
+
+/**
+ * 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 */