STRUCT MUX_CMDH(9)

💖 struct mux_cmdh(9) 💖

okay so bestie, welcome to the Kernel API Manual entry for struct mux_cmdh — literally the glow-up guide to the Structure of Command Header. buckle up, it's short but she's iconic ✨

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🎀 NAME 🎀

struct mux_cmdh — the Structure of Command Header. that's it, that's the vibe. no cap. 💅

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🌸 SYNOPSIS 🌸

here's her actual shape, copy it exactly or the compiler will simply end you:

struct mux_cmdh {
    __le32 signature;
    __le16 cmd_len;
    u8 if_id;
    u8 reserved;
    __le32 next_cmd_index;
    __le32 command_type;
    __le32 transaction_id;
    union mux_cmd_param param;
 };

look at her. absolutely serving struct energy 👑

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🦋 Members 🦋

okay now the member-by-member breakdown, no skipping, we respect all the fields in this house 🫶

• signature — the Signature of the Command Header. she's the little name tag at the party, fr fr 🎀
• cmd_len — Length (in bytes) of the Aggregated Command Block. yes bestie, in bytes, write that down 📝
• if_id — the ID of the interface that the commands in the table belong to. like which friend group they roll with 💅
• reserved — Reserved. Set it to zero. not zero? don't. just don't 🙈
• next_cmd_index — Index (in bytes) to the next command in the buffer. again, in bytes, she said what she said ✨
• command_type — Command Enum. See the table in the Session Management chapter for details — that's where the lore lives, go read it iykyk 📖
• transaction_id — The Transaction ID shall be unique to the command. shall. be. unique. that's a whole sentence of requirement, respect it 👑
• param — Optional parameters used with the command. optional bestie, so don't stress, but they're there if you need 'em 🌈

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🔥 SEE ALSO 🔥

the whole extended universe, all linked, all real, all in the Kernel file ./drivers/net/wwan/iosm/iosm_ipc_mux_codec.h — go be nosy 👀

• struct mux_acbh(9)
• struct mux_adbh(9)
• struct mux_adth(9)
• struct mux_adgh(9)
• struct mux_lite_cmdh(9)
• struct mux_lite_vfl(9)
• struct ipc_mem_lite_gen_tbl(9)
• union mux_type_cmdh(9)
• union mux_type_header(9)
• ipc_mux_dl_acb_send_cmds(9)
• ipc_mux_netif_tx_flowctrl(9)
• ipc_mux_ul_trigger_encode(9)
• ipc_mux_ul_data_encode(9)
• ipc_mux_ul_encoded_process(9)

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lowkey a whole friend group of structs and unions and functions, and you thought this page was gonna be short 😭 go read them all, they're literally waiting 🍓

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and that's the whole page, bestie! this came from ./drivers/net/wwan/iosm, dated October 2026, and it's the struct mux_cmdh(9) page — slay, you're now educated 💜🧚⭐