STRUCT FPGA_MANAGER_OPS(9)

💖 struct fpga_manager_ops(9) — NAME 💖

okay bestie, welcome to the Kernel API Manual ✨ this one's all about struct fpga_manager_ops — the ops for low level fpga manager drivers 🎀

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🌸 SYNOPSIS 🌸

like, here's the whole struct, literally character for character, no cap:

struct fpga_manager_ops {
    size_t initial_header_size;
    bool skip_header;
    enum fpga_mgr_states (*state)(struct fpga_manager *mgr);
    u64 (*status)(struct fpga_manager *mgr);
    int (*parse_header)(struct fpga_manager *mgr, struct fpga_image_info
*info, const char *buf, size_t count);
    int (*write_init)(struct fpga_manager *mgr, struct fpga_image_info
*info, const char *buf, size_t count);
    int (*write)(struct fpga_manager *mgr, const char *buf, size_t
count);
    int (*write_sg)(struct fpga_manager *mgr, struct sg_table *sgt);
    int (*write_complete)(struct fpga_manager *mgr, struct
fpga_image_info *info);
    void (*fpga_remove)(struct fpga_manager *mgr);
    const struct attribute_group **groups;
 };

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✨ Members ✨

bestie, let's meet the whole squad, one member at a time 🫶

• initial_header_size — the minimum number of bytes that should be passed into parse_header and write_init. like, don't skimp 💅
• skip_header — a bool flag that tells the fpga-mgr core whether it should skip the info->header_size part at the beginning of the image when it's invoking the write callback. iykyk 🦋
• state — returns an enum value of the FPGA's state 👑
• status — returns status of the FPGA, including the reconfiguration error code 😭
• parse_header — parses the FPGA image header to set info->header_size and info->data_size. and like, in case the input buffer is not large enough, set the required size to info->header_size and return -EAGAIN. she said try again later 💀
• write_init — prepare the FPGA to receive configuration data 🎀
• write — write count bytes of configuration data to the FPGA ✨
• write_sg — write the scatter list of configuration data to the FPGA 🌈
• write_complete — set the FPGA to operating state after writing is done, slay 💅
• fpga_remove — optional: Set FPGA into a specific state during driver remove 🙈
• groups — optional attribute groups. ✨

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💜 Description 💜

so fpga_manager_ops are the low level functions implemented by a specific fpga manager driver. main character energy, honestly 🔥

and the optional ones? they get tested for NULL before being called, so leaving them out is totally fine — no pressure, bestie, they're not gonna crash on you just for ghosting them 🧚

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⭐ SEE ALSO ⭐

go read these next, fr fr:

• Kernel file ./include/linux/fpga/fpga-mgr.h enum fpga_mgr_states(9)
• FPGA Manager flags(9)
• struct fpga_image_info(9)
• struct fpga_compat_id(9)
• struct fpga_manager_info(9)
• struct fpga_manager(9)

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k that's the whole page, bestie!! 💖 this was ./include/linux/fpga, October 2026, and the star of the show is struct fpga_manager_ops(9) — go forth and manage those fpgas, you absolute icon 👑✨