STRUCT IWL_TIME_MSMT_CFM_NOTIFY(9)

💅 struct iwl_time_msmt_cfm_notify(9) — the kernel API manual, but make it make sense

okay bestie so this is a page from the Kernel API Manual, and it's all about struct iwl_time_msmt_cfm_notify — literally the Time Sync measurement confirmation notification for TM/FTM 🕐✨. It gets sent the moment an 802.11 Ack comes back from the peer for the TM/FTM measurement action frame you just Tx'ed. So yeah, it's the "they got it, here's the receipts" struct. no cap.

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🌸 NAME 🌸

struct iwl_time_msmt_cfm_notify — Time Sync measurement confirmation notification for TM/FTM 💖. It's sent on receipt of an 802.11 Ack from the peer for the Tx'ed TM/FTM measurement action frame. basically the confirmation text of the wireless world 🫶

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✨ SYNOPSIS ✨

struct iwl_time_msmt_cfm_notify {
    u8 peer_addr[ETH_ALEN];
    u8 reserved[2];
    __le32 dialog_token;
    __le32 t1_hi;
    __le32 t1_lo;
    __le32 t1_max_err;
    __le32 t4_hi;
    __le32 t4_lo;
    __le32 t4_max_err;
 };

look at her. iconic layout. 👑

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🎀 Members 🎀

okay let's go member by member, i'm obsessed with how tidy this is:

• peer_addr — the peer address 🦋 like, who are we talking to
• reserved — for alignment, bestie. it's padding. it's there so everything sits pretty 💅
• dialog_token — the measurement flow dialog token number 🔢
• t1_hi — high dword of the t1-time, aka when the Tx'ed action frame departed on the sender side, measured in units of 10 nano seconds ⏱️
• t1_lo — low dword of that same t1-time, the Tx'ed action frame's departure on the sender side, also in units of 10 nano seconds
• t1_max_err — maximum t1-time error, in units of 10 nano seconds 😭 (tiny numbers, huge drama)
• t4_hi — high dword of the t4-time, aka when the Rx'ed action frame's Ack arrived on the sender side, in units of 10 nano seconds 🕰️
• t4_lo — low dword of that t4-time, the Rx'ed action frame's Ack arrival on the sender side, units of 10 nano seconds
• t4_max_err — maximum t4-time error, in units of 10 nano seconds

so hi/lo dwords split each timestamp, and the _max_err fields keep the accuracy humble. we love a humble struct 🌈

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🦋 SEE ALSO 🦋

the whole friend group, fr fr — go read these next:

• Kernel file ./drivers/net/wireless/intel/iwlwifi/fw/api/datapath.h
• enum iwl_data_path_subcmd_ids(9)
• struct iwl_mu_group_mgmt_cmd(9)
• struct iwl_mu_group_mgmt_notif(9)
• struct iwl_time_sync_cfg_cmd(9)
• enum iwl_synced_time_operation(9)
• struct iwl_synced_time_cmd(9)
• struct iwl_synced_time_rsp(9)
• struct iwl_time_msmt_ptp_ctx(9)
• struct iwl_time_msmt_notify(9)
• struct iwl_channel_estimation_cfg(9)
• enum iwl_thermal_dual_chain_req_events(9)
• struct iwl_thermal_dual_chain_request(9)
• struct iwl_rlc_properties(9)
• struct iwl_sad_properties(9)
• struct iwl_rlc_config_cmd(9)
• enum iwl_rx_baid_action(9)
• struct iwl_rx_baid_cfg_cmd_alloc(9)
• struct iwl_rx_baid_cfg_cmd_modify(9)
• struct iwl_rx_baid_cfg_cmd_remove_v1(9)
• struct iwl_rx_baid_cfg_cmd_remove(9)
• struct iwl_rx_baid_cfg_cmd(9)
• struct iwl_rx_baid_cfg_resp(9)
• enum iwl_scd_queue_cfg_operation(9)
• struct iwl_scd_queue_cfg_cmd(9)
• enum iwl_sec_key_flags(9)
• struct iwl_sec_key_cmd(9)

like, that's a whole reading list. main character energy from every single one of them 💀✨

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and that's the page! 🎀 sign-off time: this lil gem comes from ./drivers/net/wireless/intel/i..., dated October 2026, and it's the struct iwl_...t_cfm_notify(9) page under the Kernel API Manual. go forth and sync your times, bestie 🧚💜