STRUCT IWL_CHANNEL_ESTIMATION_CFG(9)

💅 struct iwl_channel_estimation_cfg(9) 💅

okay bestie, welcome to the Kernel API Manual — this is the glow-up guide to struct iwl_channel_estimation_cfg(9), aka the channel estimation reporting config. yes it's a struct. yes it's important. let's get into it 🫶

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✨ NAME ✨

struct iwl_channel_estimation_cfg — channel estimation reporting config. that's the whole vibe. it's the config struct that tells the firmware how you want channel estimation matrices reported back to you 📡

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🌸 SYNOPSIS 🌸

struct iwl_channel_estimation_cfg {
    __le32 flags;
    __le32 timer;
    __le32 count;
    __le32 rate_n_flags_mask;
    __le32 rate_n_flags_val;
    __le32 reserved;
    __le64 frame_types;
 };

look at her. seven fields, all little-endian, all doing their job. iconic behavior honestly 👑

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🎀 Members 🎀

• flags — the flags field, bestie. and like, which flags? see enum iwl_channel_estimation_flags — that's where the actual flag meanings live, this is just the container 💅
• timer — if it's enabled via flags (big if, note it), it automatically disables after this many microseconds. cute little self-destruct timer ⏳
• count — again, if enabled via flags, it automatically disables after this many frames with a channel estimation matrix were captured. so you get N frames and then it's done, no cap 📸
• rate_n_flags_mask — this one's the picky one. it only tries to record the channel estimation matrix if the rate_n_flags value for the received frame (the original calls it rx_rnf, we love a nickname) matches the mask/value given here, exactly like this:

(rx_rnf & rate_n_flags_mask) == rate_n_flags_val

read it like a little equation, because it literally is one 🧮

• rate_n_flags_val — see rate_n_flags_mask above. they're a matching set, they come as a pair, do not separate them 🫶
• reserved — reserved (for alignment). she's just here to keep things lined up. we respect her 🎀
• frame_types — a bitmap of frame types to capture. here's the deal: the received frame's subtype|type takes 6 bits in the frame, and the corresponding bit in this field must be set to 1 to capture channel estimation for that frame type. want all the frame types? set it to all-ones and go off 💀✨

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🦋 SEE ALSO 🦋

all the neighbors in the header file, gathered here so you can go snoop on them too. the kernel file is ./drivers/net/wireless/intel/iwlwifi/fw/api/datapath.h, and from there we've got:

• 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_time_msmt_cfm_notify(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)

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that's the whole page, bestie, go forth and capture some channel estimation matrices responsibly 💖

source: ./drivers/net/wireless/intel/i...  ·  date: October 2026 — mwah, thanks for reading, ily, bye 💋🎀✨