STRUCT IPC_MEM_MSG_FEATURE_SET(9)

✨ struct ipc_mem_msg_feature_set — Kernel API Manual ✨

okay bestie, welcome to the <pink>kernel API manual</pink> for struct ipc_mem_msg_feature_set (that's the (9) section babe, kernel devs only 💅). This one is a whole vibe — it's the message structure for the feature_set message. Yes, that's literally the name. Slay.

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🎀 NAME 🎀

struct ipc_mem_msg_feature_set — the message structure for the feature_set message. That's it, that's the whole thing 💖

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✨ SYNOPSIS ✨

here's the shape of it, and no I did NOT touch a single character, she's iconic as-is 👑

struct ipc_mem_msg_feature_set {
    __le32 reserved1[2];
    __le16 reserved2;
    u8 reset_enable;
    u8 type_of_message;
    __le32 reserved3;
    __le32 reserved4;
    __le32 completion_status;
 };

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🦋 Members 🦋

okay so let's go through every single field, in order, no skipping, we don't do that here 🫶

• reserved1 — Reserved. That's the whole description bestie. It's reserved. Leave it alone 🙈
• reserved2 — Reserved. Same energy. Off-limits 💀
• reset_enable — the actual main character of this struct honestly: 0 = out-of-band, 1 = in-band-crash notification. Note those values EXACTLY, iykyk ⭐
• type_of_message — Message type. She's a u8, she's got range 🌸
• reserved3 — Reserved. (yes, again. there's like, a lot of reserved fields, we don't ask questions 💅)
• reserved4 — Reserved. Fourth one. Periodt 🎀
• completion_status — Message Completion Status. The finale, the grand reveal, the __le32 of destiny 🔥

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🔥 SEE ALSO 🔥

okay this list is LONG and I'm obsessed with how thorough it is. Every single one of these, right now, no cap 👑

• Kernel file ./drivers/net/wwan/iosm/iosm_ipc_protocol_ops.h — and also enum ipc_mem_td_cs(9)
• enum ipc_mem_msg_cs(9)
• struct ipc_msg_prep_args_pipe(9)
• struct ipc_msg_prep_args_sleep(9)
• struct ipc_msg_prep_feature_set(9)
• struct ipc_msg_prep_map(9)
• struct ipc_msg_prep_unmap(9)
• union ipc_msg_prep_args(9)
• enum ipc_msg_prep_type(9)
• struct ipc_rsp(9)
• enum ipc_mem_msg(9)
• struct ipc_mem_msg_open_pipe(9)
• struct ipc_mem_msg_close_pipe(9)
• struct ipc_mem_msg_abort_pipe(9)
• struct ipc_mem_msg_host_sleep(9)
• struct ipc_mem_msg_common(9)
• union ipc_mem_msg_entry(9)
• ipc_protocol_msg_prep(9)
• ipc_protocol_msg_hp_update(9)
• ipc_protocol_msg_process(9)
• ipc_protocol_ul_td_send(9)
• ipc_protocol_ul_td_process(9)
• ipc_protocol_dl_td_prepare(9)
• ipc_protocol_dl_td_process(9)
• ipc_protocol_get_head_tail_index(9)
• ipc_protocol_get_ipc_status(9)
• ipc_protocol_pipe_cleanup(9)
• ipc_protocol_get_ap_exec_stage(9)
• ipc_protocol_pm_dev_get_sleep_notification(9)

like, that's a full friend group and every one of them showed up 💜

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ngl if you're poking at the reserved fields thinking "surely I can repurpose these" — no babe. Reserved means reserved. Hands off 🙈

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kay bye bestie 🫶 this page lives at ./drivers/net/wwan/iosm, it's from October 2026, and the header/footer had her credited as struct ipc_m..._feature_set(9) — the truncated queen herself. mwah 💋💖