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