STRUCT IWL_HOST_CMD(9)

💖 struct iwl_host_cmd(9) 💖

okay bestie, welcome to the Kernel API Manual entry for struct iwl_host_cmd — it's giving "kernel internals but make it chic" and honestly? we're obsessed. this little struct is the host command to the uCode, and we're gonna walk through it together, no cap 🌸

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✨ NAME ✨

struct iwl_host_cmd — host command to the uCode 🫶

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🌈 SYNOPSIS 🌈

struct iwl_host_cmd {
    const void *data[IWL_MAX_CMD_TBS_PER_TFD];
    struct iwl_rx_packet *resp_pkt;
    unsigned long _rx_page_addr;
    u32 _rx_page_order;
    u32 flags;
    u32 id;
    u16 len[IWL_MAX_CMD_TBS_PER_TFD];
    u8 dataflags[IWL_MAX_CMD_TBS_PER_TFD];
 };

like, look at her. so neat. so structured. main character energy fr 💅

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👑 Members 👑

• data — an array of chunks that composes the data of the host command 🎀 like, the actual payload pieces, one chunk at a time.
• resp_pkt — the response packet, but ONLY if CMD_WANT_SKB was set. iykyk 😌 if you didn't set that flag, don't come looking here.
• _rx_page_addr — (internally used to free response packet) 🙈 that's the whole vibe. internal business. just know she's there for the freeing.
• _rx_page_order — (internally used to free response packet) 💀 yes bestie, same energy, also internal, also about freeing the response packet.
• flags — can be CMD_* ⭐ so like, whichever CMD_ prefixed flag you need, this is the spot.
• id — the command id of the host command. and for wide commands, this encodes the version and group as well 🔥 so it's doing a little extra work, love that for her.
• len — array of the lengths of the chunks in data 🎀 one length per chunk, matching up with data, keep them consistent bestie, that's the whole point.
• dataflags — IWL_HCMD_DFL_* 🌸 yup, the IWL_HCMD_DFL_ prefixed data flags go right here.

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🦋 SEE ALSO 🦋

• Kernel file ./drivers/net/wireless/intel/iwlwifi/iwl-trans.h Transport layer - what is it ?(9)
• Life cycle of the transport layer(9)
• enum CMD_MODE(9)
• struct iwl_device_cmd(9)
• struct iwl_device_tx_cmd(9)
• enum iwl_hcmd_dataflag(9)
• enum iwl_trans_status(9)
• struct iwl_dump_sanitize_ops(9)
• struct iwl_trans_config(9)
• struct iwl_trans_rxq_dma_data(9)
• struct iwl_pnvm_image(9)
• enum iwl_trans_state(9)
• Platform power management(9)
• enum iwl_ini_cfg_state(9)
• struct iwl_dram_data(9)
• struct iwl_dram_regions(9)
• struct iwl_fw_mon(9)
• struct iwl_self_init_dram(9)
• struct iwl_imr_data(9)
• struct iwl_pc_data(9)
• struct iwl_trans_debug(9)
• struct iwl_trans_info(9)
• struct iwl_trans(9)
• iwl_trans_resched_with_nic_access(9)

like okay that's a LOT of cross-references but that's the transport layer rabbit hole for you, click through at your own risk 🔥

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okay that's the whole page bestie, every last member accounted for, nothing skipped, periodt 💜

this gem came from ./drivers/net/wireless/intel/i... and it's dated October 2026 — shoutout to the kernel docs, you ate 🎀✨