STRUCT F_NCM_OPTS(9)

🎀 struct f_ncm_opts(9) 🎀

okay bestie, welcome to the Kernel API Manual ✨ we're looking at struct f_ncm_opts and honestly? she's iconic. it's giving NCM function options and we're gonna get into every single field, no skips, no cap 💅

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✨ NAME ✨

struct f_ncm_opts — NCM function options 🦋

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✨ SYNOPSIS ✨

struct f_ncm_opts {
    struct usb_function_instance    func_inst;
    struct net_device               *net;
    int bind_count;
    struct config_group             *ncm_interf_group;
    struct usb_os_desc              ncm_os_desc;
    char ncm_ext_compat_id[16];
    struct mutex                    lock;
    int refcnt;
    u16 max_segment_size;
};

look at her. perfect. no notes 🔥

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✨ Members ✨

• func_inst — the USB function instance 🫶 like, the actual USB function vibe right here.
• net — the net_device that's associated with the NCM function. that's her network device, she's attached 💖
• bind_count — tracks how many configurations the NCM function is bound to, and it's lowkey doing important work: it prevents double-registration of the net device 🙈 like, not me registering the net device twice... couldn't be her.
• ncm_interf_group — the ConfigFS group for the NCM interface 🎀
• ncm_os_desc — the USB OS descriptor for NCM ✨
• ncm_ext_compat_id — the extended compatibility ID 💜
• lock — protects the data from concurrent access by configfs read/write and create symlink/remove symlink operations 🔒 she's the bodyguard, the main character energy, keeping everybody from touching the data at the same time.
• refcnt — reference counter for the function instance, literally counting her refs 👑
• max_segment_size — maximum segment size 🌸

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🌈 SEE ALSO 🌈

Kernel file ./drivers/usb/gadget/function/u_ncm.h — go read it, iykyk 📖

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okay that's the whole struct, every member accounted for, nothing skipped, we ate and left no crumbs 💅✨

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and that's a wrap bestie!! 🎀 this page came to you from ./drivers/usb/gadget/function and it's dated October 2026 — mwah, love you, go forth and bind your NCM functions responsibly 💖🦋🍓