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struct iwl4965_tx_queue - Tx Queue for DMA

struct iwl4965_tx_queue {
    struct iwl4965_queue q;
    struct iwl4965_tfd_frame * bd;
    struct iwl_cmd * cmd;
    dma_addr_t dma_addr_cmd;
    struct iwl4965_tx_info * txb;
    int need_update;
    int sched_retry;
};

Members

q

generic Rx/Tx queue descriptor

bd

base of circular buffer of TFDs

cmd

array of command/Tx buffers

dma_addr_cmd

physical address of cmd/tx buffer array

txb

array of per-TFD driver data

need_update

indicates need to update read/write index

sched_retry

indicates queue is high-throughput aggregation (HT AGG) enabled

Description

A Tx queue consists of circular buffer of BDs (a.k.a. TFDs, transmit frame descriptors) and required locking structures.

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struct iwl_cmd -

struct iwl_cmd {
};

Members

Description

For allocation of the command and tx queues, this establishes the overall size of the largest command we send to uCode, except for a scan command (which is relatively huge; space is allocated separately).

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struct iwl4965_rx_queue - Rx queue

struct iwl4965_rx_queue {
    u32 processed;
    u32 read;
    u32 write;
    u32 free_count;
    struct list_head rx_free;
    struct list_head rx_used;
    int need_update;
};

Members

processed

Internal index to last handled Rx packet

read

Shared index to newest available Rx buffer

write

Shared index to oldest written Rx packet

free_count

Number of pre-allocated buffers in rx_free

rx_free

list of free SKBs for use

rx_used

List of Rx buffers with no SKB

need_update

flag to indicate we need to update read/write index

NOTE

rx_free and rx_used are used as a FIFO for iwl4965_rx_mem_buffers

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struct iwl4965_ht_agg - - aggregation status while waiting for block-ack

struct iwl4965_ht_agg {
    u16 txq_id;
    u16 frame_count;
    u16 wait_for_ba;
    u16 start_idx;
    u32 rate_n_flags;
#define IWL_AGG_OFF 0
#define IWL_AGG_ON 1
#define IWL_EMPTYING_HW_QUEUE_ADDBA 2
#define IWL_EMPTYING_HW_QUEUE_DELBA 3
};

Members

txq_id

Tx queue used for Tx attempt

frame_count

# frames attempted by Tx command

wait_for_ba

Expect block-ack before next Tx reply

start_idx

Index of 1st Transmit Frame Descriptor (TFD) in Tx window

rate_n_flags

Rate at which Tx was attempted

Description

If REPLY_TX indicates that aggregation was attempted, driver must wait for block ack (REPLY_COMPRESSED_BA). This struct stores tx reply info until block ack arrives.

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struct iwl_hw_params -

struct iwl_hw_params {
    u16 max_txq_num;
    u16 tx_cmd_len;
    u16 max_rxq_size;
    u16 max_rxq_log;
};

Members

max_txq_num

Max # Tx queues supported

tx_cmd_len

Size of Tx command (but not including frame itself)

max_rxq_size

Max # Rx frames in Rx queue (must be power-of-2)

max_rxq_log

Log-base-2 of max_rxq_size

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iwl4965_hw_find_station - Find station id for a given BSSID

u8 iwl4965_hw_find_station (struct iwl_priv * priv, const u8 * bssid)

Arguments

bssid

MAC address of station ID to find

NOTE

This should not be hardware specific but the code has not yet been merged into a single common layer for managing the station tables.

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