diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-4965-commands.h')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-4965-commands.h | 201 |
1 files changed, 175 insertions, 26 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-4965-commands.h b/drivers/net/wireless/iwlwifi/iwl-4965-commands.h index 44addea5062..cbe91dbe760 100644 --- a/drivers/net/wireless/iwlwifi/iwl-4965-commands.h +++ b/drivers/net/wireless/iwlwifi/iwl-4965-commands.h @@ -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; |