STRUCT IWL_TRANS_CONFIG(9)

💖 NAME 💖

struct iwl_trans_config — the transport configuration, bestie. It's the big struct of settings you fill in before the transport wakes up and starts doing its thing ✨

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🦋 SYNOPSIS 🦋

struct iwl_trans_config {
    u8 cmd_queue;
    u8 cmd_fifo;
    u8 n_no_reclaim_cmds;
    u8 no_reclaim_cmds[MAX_NO_RECLAIM_CMDS];
    enum iwl_amsdu_size rx_buf_size;
    bool scd_set_active;
    const struct iwl_hcmd_arr *command_groups;
    int command_groups_size;
    u8 cb_data_offs;
    bool fw_reset_handshake;
    u8 queue_alloc_cmd_ver;
    bool wide_cmd_header;
    u8 rx_mpdu_cmd, rx_mpdu_cmd_hdr_size;
    u8 dsbr_urm_fw_dependent:1, dsbr_urm_permanent:1,
ext_32khz_clock_valid:1;
    u32 mbx_addr_0_step;
    u32 mbx_addr_1_step;
 };

Like, yes, those last three are bitfields sharing one u8, we don't make the rules, we just vibe with them 💅

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🎀 MEMBERS 🎀

• cmd_queue — the index of the command queue. It must be set before start_fw — no cap, this one's a hard requirement 👑
• cmd_fifo — the fifo for host commands 🍓
• n_no_reclaim_cmds — the # of commands in the list (yes, that list, the next one)
• no_reclaim_cmds — some devices erroneously don't set the SEQ_RX_FRAME bit on some notifications 😭 so this is the list of such notifications to filter. Max length is MAX_NO_RECLAIM_CMDS.
• rx_buf_size — the RX buffer size needed for A-MSDUs. If it's unset, 4k will be the RX buffer size. Defaults, we love them 🫶
• scd_set_active — should the transport configure the SCD for the HCMD queue? That's the whole question 💀
• command_groups — array of command groups, each member is an array of the commands in the group; for debugging only 🔍
• command_groups_size — number of command groups, so we don't do illegal access (protected mode: on) 🛡️
• cb_data_offs — offset inside skb->cb to store transport data at; must have space for at least two pointers ⭐
• fw_reset_handshake — firmware supports reset flow handshake 🤝
• queue_alloc_cmd_ver — queue allocation command version. Set to 0 for using the older SCD_QUEUE_CFG, set to the version of SCD_QUEUE_CONFIG_CMD otherwise. Pick your fighter 🥊
• wide_cmd_header — true when ucode supports wide command header format 📏
• rx_mpdu_cmd — MPDU RX command ID, must be assigned by opmode before starting the firmware, used for tracing 🕵️‍♀️
• rx_mpdu_cmd_hdr_size — used for tracing, the amount of data before the start of the 802.11 header in the rx_mpdu_cmd 📐
• dsbr_urm_fw_dependent — switch to URM based on fw settings 🔄
• dsbr_urm_permanent — switch to URM permanently ♾️
• ext_32khz_clock_valid — if true, the external 32 KHz clock can be used 🕰️
• mbx_addr_0_step — step address data 0 📬
• mbx_addr_1_step — step address data 1 📭

---

🌈 DESCRIPTION 🌈

These values should be set before iwl_trans_op_mode_enter. Like, before, bestie. Not after. Timing is everything, it's giving main character energy ⏰✨

Seriously though — fill these in first. This is the setup, not the cleanup 💀

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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)
• struct iwl_host_cmd(9)
• enum iwl_trans_status(9)
• struct iwl_dump_sanitize_ops(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)

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okay that's literally the whole page, go read the source bestie 💅

This one's from the Kernel API Manual — ./drivers/net/wireless/intel/i..., dated October 2026, and the page is struct iwl_trans_config(9). Slay, see you in the next manpage 🎀🦋