STRUCT USB_FFS_DMABUF_TRANSFER_REQ(9)

✨ struct usb_ffs_dmabuf_transfer_req — the Kernel API Manual era ✨

okay so bestie, welcome to the Kernel API Manual entry for struct usb_ffs_dmabuf_transfer_req(9) — yes the header truncates it to struct usb_f...transfer_req(9), that's just how the man page renders it, don't come for me 💅

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🌸 NAME 🌸

struct usb_ffs_dmabuf_transfer_req — Transfer request for a DMABUF object. that's literally the whole vibe. it's the little struct that says "hey, here's a DMABUF, go move some data" 🦋

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🎀 SYNOPSIS 🎀

struct usb_ffs_dmabuf_transfer_req {
    int fd;
    __u32 flags;
    __u64 length;
 };

like, look at her. three fields. iconic. no notes. 👑

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💖 Members 💖

• fd — the file descriptor of the DMABUF object. bestie it's the fd. that's the whole thing. it's how you point at the buffer 🫶
• flags — one or more USB_FFS_DMABUF_TRANSFER_* flags. plural behavior, one or more, so stack 'em if you got 'em ✨
• length — number of bytes used in this DMABUF for the data transfer. and ngl, the man page itself says it should generally be set to the DMABUF's size — like yeah, that's the default move, that's the assignment 💀

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🦋 SEE ALSO 🦋

• Kernel file ./include/uapi/linux/usb/functionfs.h
• struct usb_dfu_functional_descriptor(9)
• descriptors(9)

go read those too, iykyk, they're the supporting cast 💜

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and that's the page!! 🎉 this little cutie lives under ./include/uapi/linux/usb, it's dated October 2026, and the whole thing is filed under struct usb_f...transfer_req(9) in the Kernel API Manual — slay, stan, periodt 🎀💅🔥