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Commit 52969981 authored by Ben Cahill's avatar Ben Cahill Committed by David S. Miller
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iwlwifi: add comments to Tx commands 

Add comments to Tx commands

Clean up unused definitions in iwl-3945-commands.h
Signed-off-by: default avatarBen Cahill <ben.m.cahill@intel.com>
Signed-off-by: default avatarZhu Yi <yi.zhu@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 2054a00b
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Showing with 267 additions and 95 deletions
drivers/net/wireless/iwlwifi/iwl-3945-commands.h
View file @ 52969981
......@@ -743,36 +743,86 @@ struct iwl4965_rx_mpdu_res_start {
* (5)
* Tx Commands & Responses:
*
* Driver must place each REPLY_TX command into one of the prioritized Tx
* queues in host DRAM, shared between driver and device. When the device's
* Tx scheduler and uCode are preparing to transmit, the device pulls the
* Tx command over the PCI bus via one of the device's Tx DMA channels,
* to fill an internal FIFO from which data will be transmitted.
*
* uCode handles all timing and protocol related to control frames
* (RTS/CTS/ACK), based on flags in the Tx command.
*
* uCode handles retrying Tx when an ACK is expected but not received.
* This includes trying lower data rates than the one requested in the Tx
* command, as set up by the REPLY_RATE_SCALE (for 3945) or
* REPLY_TX_LINK_QUALITY_CMD (4965).
*
* Driver sets up transmit power for various rates via REPLY_TX_PWR_TABLE_CMD.
* This command must be executed after every RXON command, before Tx can occur.
*****************************************************************************/
/* Tx flags */
/* REPLY_TX Tx flags field */
/* 1: Use Request-To-Send protocol before this frame.
* Mutually exclusive vs. TX_CMD_FLG_CTS_MSK. */
#define TX_CMD_FLG_RTS_MSK __constant_cpu_to_le32(1 << 1)
/* 1: Transmit Clear-To-Send to self before this frame.
* Driver should set this for AUTH/DEAUTH/ASSOC-REQ/REASSOC mgmnt frames.
* Mutually exclusive vs. TX_CMD_FLG_RTS_MSK. */
#define TX_CMD_FLG_CTS_MSK __constant_cpu_to_le32(1 << 2)
/* 1: Expect ACK from receiving station
* 0: Don't expect ACK (MAC header's duration field s/b 0)
* Set this for unicast frames, but not broadcast/multicast. */
#define TX_CMD_FLG_ACK_MSK __constant_cpu_to_le32(1 << 3)
/* 1: Use rate scale table (see REPLY_TX_LINK_QUALITY_CMD).
* Tx command's initial_rate_index indicates first rate to try;
* uCode walks through table for additional Tx attempts.
* 0: Use Tx rate/MCS from Tx command's rate_n_flags field.
* This rate will be used for all Tx attempts; it will not be scaled. */
#define TX_CMD_FLG_STA_RATE_MSK __constant_cpu_to_le32(1 << 4)
/* 1: Expect immediate block-ack.
* Set when Txing a block-ack request frame. Also set TX_CMD_FLG_ACK_MSK. */
#define TX_CMD_FLG_IMM_BA_RSP_MASK __constant_cpu_to_le32(1 << 6)
/* 1: Frame requires full Tx-Op protection.
* Set this if either RTS or CTS Tx Flag gets set. */
#define TX_CMD_FLG_FULL_TXOP_PROT_MSK __constant_cpu_to_le32(1 << 7)
/* Tx antenna selection field; used only for 3945, reserved (0) for 4965.
* Set field to "0" to allow 3945 uCode to select antenna (normal usage). */
#define TX_CMD_FLG_ANT_SEL_MSK __constant_cpu_to_le32(0xf00)
#define TX_CMD_FLG_ANT_A_MSK __constant_cpu_to_le32(1 << 8)
#define TX_CMD_FLG_ANT_B_MSK __constant_cpu_to_le32(1 << 9)
/* ucode ignores BT priority for this frame */
/* 1: Ignore Bluetooth priority for this frame.
* 0: Delay Tx until Bluetooth device is done (normal usage). */
#define TX_CMD_FLG_BT_DIS_MSK __constant_cpu_to_le32(1 << 12)
/* ucode overrides sequence control */
/* 1: uCode overrides sequence control field in MAC header.
* 0: Driver provides sequence control field in MAC header.
* Set this for management frames, non-QOS data frames, non-unicast frames,
* and also in Tx command embedded in REPLY_SCAN_CMD for active scans. */
#define TX_CMD_FLG_SEQ_CTL_MSK __constant_cpu_to_le32(1 << 13)
/* signal that this frame is non-last MPDU */
/* 1: This frame is non-last MPDU; more fragments are coming.
* 0: Last fragment, or not using fragmentation. */
#define TX_CMD_FLG_MORE_FRAG_MSK __constant_cpu_to_le32(1 << 14)
/* calculate TSF in outgoing frame */
/* 1: uCode calculates and inserts Timestamp Function (TSF) in outgoing frame.
* 0: No TSF required in outgoing frame.
* Set this for transmitting beacons and probe responses. */
#define TX_CMD_FLG_TSF_MSK __constant_cpu_to_le32(1 << 16)
/* activate TX calibration. */
#define TX_CMD_FLG_CALIB_MSK __constant_cpu_to_le32(1 << 17)
/* signals that 2 bytes pad was inserted
after the MAC header */
/* 1: Driver inserted 2 bytes pad after the MAC header, for (required) dword
* alignment of frame's payload data field.
* 0: No pad
* Set this for MAC headers with 26 or 30 bytes, i.e. those with QOS or ADDR4
* field (but not both). Driver must align frame data (i.e. data following
* MAC header) to DWORD boundary. */
#define TX_CMD_FLG_MH_PAD_MSK __constant_cpu_to_le32(1 << 20)
/* HCCA-AP - disable duration overwriting. */
......@@ -788,24 +838,34 @@ struct iwl4965_rx_mpdu_res_start {
#define TX_CMD_SEC_SHIFT 6
#define TX_CMD_SEC_KEY128 0x08
/*
* TX command Frame life time
*/
struct iwl3945_dram_scratch {
u8 try_cnt;
u8 bt_kill_cnt;
__le16 reserved;
} __attribute__ ((packed));
/*
* REPLY_TX = 0x1c (command)
*/
struct iwl3945_tx_cmd {
/*
* MPDU byte count:
* MAC header (24/26/30/32 bytes) + 2 bytes pad if 26/30 header size,
* + 8 byte IV for CCM or TKIP (not used for WEP)
* + Data payload
* + 8-byte MIC (not used for CCM/WEP)
* NOTE: Does not include Tx command bytes, post-MAC pad bytes,
* MIC (CCM) 8 bytes, ICV (WEP/TKIP/CKIP) 4 bytes, CRC 4 bytes.i
* Range: 14-2342 bytes.
*/
__le16 len;
/*
* MPDU or MSDU byte count for next frame.
* Used for fragmentation and bursting, but not 11n aggregation.
* Same as "len", but for next frame. Set to 0 if not applicable.
*/
__le16 next_frame_len;
__le32 tx_flags;
__le32 tx_flags; /* TX_CMD_FLG_* */
u8 rate;
/* Index of recipient station in uCode's station table */
u8 sta_id;
u8 tid_tspec;
u8 sec_ctl;
......@@ -827,7 +887,17 @@ struct iwl3945_tx_cmd {
__le16 pm_frame_timeout;
__le16 attempt_duration;
} timeout;
/*
* Duration of EDCA burst Tx Opportunity, in 32-usec units.
* Set this if txop time is not specified by HCCA protocol (e.g. by AP).
*/
__le16 driver_txop;
/*
* MAC header goes here, followed by 2 bytes padding if MAC header
* length is 26 or 30 bytes, followed by payload data
*/
u8 payload[0];
struct ieee80211_hdr hdr[0];
} __attribute__ ((packed));
......@@ -899,37 +969,6 @@ enum {
TX_ABORT_REQUIRED_MSK = 0x80000000, /* bits 31:31 */
};
/* *******************************
* TX aggregation state
******************************* */
enum {
AGG_TX_STATE_TRANSMITTED = 0x00,
AGG_TX_STATE_UNDERRUN_MSK = 0x01,
AGG_TX_STATE_BT_PRIO_MSK = 0x02,
AGG_TX_STATE_FEW_BYTES_MSK = 0x04,
AGG_TX_STATE_ABORT_MSK = 0x08,
AGG_TX_STATE_LAST_SENT_TTL_MSK = 0x10,
AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK = 0x20,
AGG_TX_STATE_LAST_SENT_BT_KILL_MSK = 0x40,
AGG_TX_STATE_SCD_QUERY_MSK = 0x80,
AGG_TX_STATE_TEST_BAD_CRC32_MSK = 0x100,
AGG_TX_STATE_RESPONSE_MSK = 0x1ff,
AGG_TX_STATE_DUMP_TX_MSK = 0x200,
AGG_TX_STATE_DELAY_TX_MSK = 0x400
};
#define AGG_TX_STATE_LAST_SENT_MSK \
(AGG_TX_STATE_LAST_SENT_TTL_MSK | \
AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK | \
AGG_TX_STATE_LAST_SENT_BT_KILL_MSK)
#define AGG_TX_STATE_TRY_CNT_POS 12
#define AGG_TX_STATE_TRY_CNT_MSK 0xf000
#define AGG_TX_STATE_SEQ_NUM_POS 16
#define AGG_TX_STATE_SEQ_NUM_MSK 0xffff0000
/*
* REPLY_TX = 0x1c (response)
*/
......@@ -939,23 +978,7 @@ struct iwl3945_tx_resp {
u8 bt_kill_count;
u8 rate;
__le32 wireless_media_time;
__le32 status; /* TX status (for aggregation status of 1st frame) */
} __attribute__ ((packed));
/*
* REPLY_COMPRESSED_BA = 0xc5 (response only, not a command)
*/
struct iwl3945_compressed_ba_resp {
__le32 sta_addr_lo32;
__le16 sta_addr_hi16;
__le16 reserved;
u8 sta_id;
u8 tid;
__le16 ba_seq_ctl;
__le32 ba_bitmap0;
__le32 ba_bitmap1;
__le16 scd_flow;
__le16 scd_ssn;
__le32 status; /* TX status */
} __attribute__ ((packed));
/*
......
drivers/net/wireless/iwlwifi/iwl-4965-commands.h
View file @ 52969981
......@@ -937,8 +937,8 @@ struct iwl4965_rx_phy_res {
__le16 channel; /* channel number */
__le16 non_cfg_phy[RX_RES_PHY_CNT]; /* upto 14 phy entries */
__le32 reserved2;
__le32 rate_n_flags;
__le16 byte_count; /* frame's byte-count */
__le32 rate_n_flags; /* RATE_MCS_* */
__le16 byte_count; /* frame's byte-count */
__le16 reserved3;
} __attribute__ ((packed));
......@@ -952,41 +952,96 @@ struct iwl4965_rx_mpdu_res_start {
* (5)
* Tx Commands & Responses:
*
* Driver must place each REPLY_TX command into one of the prioritized Tx
* queues in host DRAM, shared between driver and device (see comments for
* SCD registers and Tx/Rx Queues). When the device's Tx scheduler and uCode
* are preparing to transmit, the device pulls the Tx command over the PCI
* bus via one of the device's Tx DMA channels, to fill an internal FIFO
* from which data will be transmitted.
*
* uCode handles all timing and protocol related to control frames
* (RTS/CTS/ACK), based on flags in the Tx command. uCode and Tx scheduler
* handle reception of block-acks; uCode updates the host driver via
* REPLY_COMPRESSED_BA (4965).
*
* uCode handles retrying Tx when an ACK is expected but not received.
* This includes trying lower data rates than the one requested in the Tx
* command, as set up by the REPLY_RATE_SCALE (for 3945) or
* REPLY_TX_LINK_QUALITY_CMD (4965).
*
* Driver sets up transmit power for various rates via REPLY_TX_PWR_TABLE_CMD.
* This command must be executed after every RXON command, before Tx can occur.
*****************************************************************************/
/* Tx flags */
/* REPLY_TX Tx flags field */
/* 1: Use Request-To-Send protocol before this frame.
* Mutually exclusive vs. TX_CMD_FLG_CTS_MSK. */
#define TX_CMD_FLG_RTS_MSK __constant_cpu_to_le32(1 << 1)
/* 1: Transmit Clear-To-Send to self before this frame.
* Driver should set this for AUTH/DEAUTH/ASSOC-REQ/REASSOC mgmnt frames.
* Mutually exclusive vs. TX_CMD_FLG_RTS_MSK. */
#define TX_CMD_FLG_CTS_MSK __constant_cpu_to_le32(1 << 2)
/* 1: Expect ACK from receiving station
* 0: Don't expect ACK (MAC header's duration field s/b 0)
* Set this for unicast frames, but not broadcast/multicast. */
#define TX_CMD_FLG_ACK_MSK __constant_cpu_to_le32(1 << 3)
/* For 4965:
* 1: Use rate scale table (see REPLY_TX_LINK_QUALITY_CMD).
* Tx command's initial_rate_index indicates first rate to try;
* uCode walks through table for additional Tx attempts.
* 0: Use Tx rate/MCS from Tx command's rate_n_flags field.
* This rate will be used for all Tx attempts; it will not be scaled. */
#define TX_CMD_FLG_STA_RATE_MSK __constant_cpu_to_le32(1 << 4)
/* 1: Expect immediate block-ack.
* Set when Txing a block-ack request frame. Also set TX_CMD_FLG_ACK_MSK. */
#define TX_CMD_FLG_IMM_BA_RSP_MASK __constant_cpu_to_le32(1 << 6)
/* 1: Frame requires full Tx-Op protection.
* Set this if either RTS or CTS Tx Flag gets set. */
#define TX_CMD_FLG_FULL_TXOP_PROT_MSK __constant_cpu_to_le32(1 << 7)
/* Tx antenna selection field; used only for 3945, reserved (0) for 4965.
* Set field to "0" to allow 3945 uCode to select antenna (normal usage). */
#define TX_CMD_FLG_ANT_SEL_MSK __constant_cpu_to_le32(0xf00)
#define TX_CMD_FLG_ANT_A_MSK __constant_cpu_to_le32(1 << 8)
#define TX_CMD_FLG_ANT_B_MSK __constant_cpu_to_le32(1 << 9)
/* ucode ignores BT priority for this frame */
/* 1: Ignore Bluetooth priority for this frame.
* 0: Delay Tx until Bluetooth device is done (normal usage). */
#define TX_CMD_FLG_BT_DIS_MSK __constant_cpu_to_le32(1 << 12)
/* ucode overrides sequence control */
/* 1: uCode overrides sequence control field in MAC header.
* 0: Driver provides sequence control field in MAC header.
* Set this for management frames, non-QOS data frames, non-unicast frames,
* and also in Tx command embedded in REPLY_SCAN_CMD for active scans. */
#define TX_CMD_FLG_SEQ_CTL_MSK __constant_cpu_to_le32(1 << 13)
/* signal that this frame is non-last MPDU */
/* 1: This frame is non-last MPDU; more fragments are coming.
* 0: Last fragment, or not using fragmentation. */
#define TX_CMD_FLG_MORE_FRAG_MSK __constant_cpu_to_le32(1 << 14)
/* calculate TSF in outgoing frame */
/* 1: uCode calculates and inserts Timestamp Function (TSF) in outgoing frame.
* 0: No TSF required in outgoing frame.
* Set this for transmitting beacons and probe responses. */
#define TX_CMD_FLG_TSF_MSK __constant_cpu_to_le32(1 << 16)
/* activate TX calibration. */
#define TX_CMD_FLG_CALIB_MSK __constant_cpu_to_le32(1 << 17)
/* signals that 2 bytes pad was inserted
after the MAC header */
/* 1: Driver inserted 2 bytes pad after the MAC header, for (required) dword
* alignment of frame's payload data field.
* 0: No pad
* Set this for MAC headers with 26 or 30 bytes, i.e. those with QOS or ADDR4
* field (but not both). Driver must align frame data (i.e. data following
* MAC header) to DWORD boundary. */
#define TX_CMD_FLG_MH_PAD_MSK __constant_cpu_to_le32(1 << 20)
/* HCCA-AP - disable duration overwriting. */
#define TX_CMD_FLG_DUR_MSK __constant_cpu_to_le32(1 << 25)
/*
* TX command security control
*/
......@@ -998,12 +1053,13 @@ struct iwl4965_rx_mpdu_res_start {
#define TX_CMD_SEC_KEY128 0x08
/*
* TX command Frame life time
* 4965 uCode updates these Tx attempt count values in host DRAM.
* Used for managing Tx retries when expecting block-acks.
* Driver should set these fields to 0.
*/
struct iwl4965_dram_scratch {
u8 try_cnt;
u8 bt_kill_cnt;
u8 try_cnt; /* Tx attempts */
u8 bt_kill_cnt; /* Tx attempts blocked by Bluetooth device */
__le16 reserved;
} __attribute__ ((packed));
......@@ -1011,13 +1067,47 @@ struct iwl4965_dram_scratch {
* REPLY_TX = 0x1c (command)
*/
struct iwl4965_tx_cmd {
/*
* MPDU byte count:
* MAC header (24/26/30/32 bytes) + 2 bytes pad if 26/30 header size,
* + 8 byte IV for CCM or TKIP (not used for WEP)
* + Data payload
* + 8-byte MIC (not used for CCM/WEP)
* NOTE: Does not include Tx command bytes, post-MAC pad bytes,
* MIC (CCM) 8 bytes, ICV (WEP/TKIP/CKIP) 4 bytes, CRC 4 bytes.i
* Range: 14-2342 bytes.
*/
__le16 len;
/*
* MPDU or MSDU byte count for next frame.
* Used for fragmentation and bursting, but not 11n aggregation.
* Same as "len", but for next frame. Set to 0 if not applicable.
*/
__le16 next_frame_len;
__le32 tx_flags;
__le32 tx_flags; /* TX_CMD_FLG_* */
/* 4965's uCode may modify this field of the Tx command (in host DRAM!).
* Driver must also set dram_lsb_ptr and dram_msb_ptr in this cmd. */
struct iwl4965_dram_scratch scratch;
__le32 rate_n_flags;
/* Rate for *all* Tx attempts, if TX_CMD_FLG_STA_RATE_MSK is cleared. */
__le32 rate_n_flags; /* RATE_MCS_* */
/* Index of destination station in uCode's station table */
u8 sta_id;
u8 sec_ctl;
/* Type of security encryption: CCM or TKIP */
u8 sec_ctl; /* TX_CMD_SEC_* */
/*
* Index into rate table (see REPLY_TX_LINK_QUALITY_CMD) for initial
* Tx attempt, if TX_CMD_FLG_STA_RATE_MSK is set. Normally "0" for
* data frames, this field may be used to selectively reduce initial
* rate (via non-0 value) for special frames (e.g. management), while
* still supporting rate scaling for all frames.
*/
u8 initial_rate_index;
u8 reserved;
u8 key[16];
......@@ -1027,8 +1117,12 @@ struct iwl4965_tx_cmd {
__le32 life_time;
__le32 attempt;
} stop_time;
/* Host DRAM physical address pointer to "scratch" in this command.
* Must be dword aligned. "0" in dram_lsb_ptr disables usage. */
__le32 dram_lsb_ptr;
u8 dram_msb_ptr;
u8 rts_retry_limit; /*byte 50 */
u8 data_retry_limit; /*byte 51 */
u8 tid_tspec;
......@@ -1036,7 +1130,17 @@ struct iwl4965_tx_cmd {
__le16 pm_frame_timeout;
__le16 attempt_duration;
} timeout;
/*
* Duration of EDCA burst Tx Opportunity, in 32-usec units.
* Set this if txop time is not specified by HCCA protocol (e.g. by AP).
*/
__le16 driver_txop;
/*
* MAC header goes here, followed by 2 bytes padding if MAC header
* length is 26 or 30 bytes, followed by payload data
*/
u8 payload[0];
struct ieee80211_hdr hdr[0];
} __attribute__ ((packed));
......@@ -1109,7 +1213,7 @@ enum {
};
/* *******************************
* TX aggregation state
* TX aggregation status
******************************* */
enum {
......@@ -1133,35 +1237,80 @@ enum {
AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK | \
AGG_TX_STATE_LAST_SENT_BT_KILL_MSK)
/* # tx attempts for first frame in aggregation */
#define AGG_TX_STATE_TRY_CNT_POS 12
#define AGG_TX_STATE_TRY_CNT_MSK 0xf000
/* Command ID and sequence number of Tx command for this frame */
#define AGG_TX_STATE_SEQ_NUM_POS 16
#define AGG_TX_STATE_SEQ_NUM_MSK 0xffff0000
/*
* REPLY_TX = 0x1c (response)
*
* This response may be in one of two slightly different formats, indicated
* by the frame_count field:
*
* 1) No aggregation (frame_count == 1). This reports Tx results for
* a single frame. Multiple attempts, at various bit rates, may have
* been made for this frame.
*
* 2) Aggregation (frame_count > 1). This reports Tx results for
* 2 or more frames that used block-acknowledge. All frames were
* transmitted at same rate. Rate scaling may have been used if first
* frame in this new agg block failed in previous agg block(s).
*
* Note that, for aggregation, ACK (block-ack) status is not delivered here;
* block-ack has not been received by the time the 4965 records this status.
* This status relates to reasons the tx might have been blocked or aborted
* within the sending station (this 4965), rather than whether it was
* received successfully by the destination station.
*/
struct iwl4965_tx_resp {
u8 frame_count; /* 1 no aggregation, >1 aggregation */
u8 bt_kill_count;
u8 failure_rts;
u8 failure_frame;
__le32 rate_n_flags;
__le16 wireless_media_time;
u8 bt_kill_count; /* # blocked by bluetooth (unused for agg) */
u8 failure_rts; /* # failures due to unsuccessful RTS */
u8 failure_frame; /* # failures due to no ACK (unused for agg) */
/* For non-agg: Rate at which frame was successful.
* For agg: Rate at which all frames were transmitted. */
__le32 rate_n_flags; /* RATE_MCS_* */
/* For non-agg: RTS + CTS + frame tx attempts time + ACK.
* For agg: RTS + CTS + aggregation tx time + block-ack time. */
__le16 wireless_media_time; /* uSecs */
__le16 reserved;
__le32 pa_power1;
__le32 pa_power1; /* RF power amplifier measurement (not used) */
__le32 pa_power2;
/*
* For non-agg: frame status TX_STATUS_*
* For agg: status of 1st frame, AGG_TX_STATE_*; other frame status
* fields follow this one, up to frame_count.
* Bit fields:
* 11- 0: AGG_TX_STATE_* status code
* 15-12: Retry count for 1st frame in aggregation (retries
* occur if tx failed for this frame when it was a
* member of a previous aggregation block). If rate
* scaling is used, retry count indicates the rate
* table entry used for all frames in the new agg.
* 31-16: Sequence # for this frame's Tx cmd (not SSN!)
*/
__le32 status; /* TX status (for aggregation status of 1st frame) */
} __attribute__ ((packed));
/*
* REPLY_COMPRESSED_BA = 0xc5 (response only, not a command)
*
* Reports Block-Acknowledge from recipient station
*/
struct iwl4965_compressed_ba_resp {
__le32 sta_addr_lo32;
__le16 sta_addr_hi16;
__le16 reserved;
/* Index of recipient (BA-sending) station in uCode's station table */
u8 sta_id;
u8 tid;
__le16 ba_seq_ctl;
......
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