STRUCT MPI3MR_BUF_ENTRY(9)

💅 struct mpi3mr_buf_entry(9) — a Kernel API Manual moment

okay bestie, so this is a page from the Kernel API Manual and it's about struct mpi3mr_buf_entry — literally the tiny little descriptor that describes your userspace buffer when you're sending MPI Passthrough requests. it's giving "small struct, big responsibilities" and honestly? iconic. 👑

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✨ NAME ✨

struct mpi3mr_buf_entry — user buffer descriptor for MPI Passthrough requests. that's it, that's the whole job, and she does it slayfully. 🎀

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🌸 SYNOPSIS 🌸

here's the whole struct, laid out exactly as it lives, no cap:

struct mpi3mr_buf_entry {
    __u8 buf_type;
    __u8 rsvd1;
    __u16 rsvd2;
    __u32 buf_len;
 };

look at her. four fields. zero drama. perfectly aligned (okay mostly aligned, the closing brace is doing its own thing and we respect it). ✨

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🦋 Members 🦋

• buf_type — the buffer type 💖 like, what kind of buffer are we even talking about here, y'know?
• rsvd1 — reserved 🙈 nothing to see here, hands off, don't touch, it's not for you bestie
• rsvd2 — reserved 🫶 same energy, also off-limits, also not for you
• buf_len — the buffer length 🌈 how long the thing is, so the kernel knows where the vibe ends

no but fr — those rsvd fields are reserved. you don't get to be creative with them. leave them exactly as they are, that's the whole assignment. 💀

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🔥 SEE ALSO 🔥

• the kernel file itself, right here: ./include/uapi/scsi/scsi_bsg_mpi3mr.h 👑 yes she's the source of truth, go read her
• struct mpi3_driver_info_layout(9)
• struct mpi3mr_bsg_in_adpinfo(9)
• struct mpi3mr_bsg_adp_reset(9)
• struct mpi3mr_change_count(9)
• struct mpi3mr_device_map_info(9)
• struct mpi3mr_all_tgt_info(9)
• struct mpi3mr_logdata_enable(9)
• struct mpi3mr_bsg_out_pel_enable(9)
• struct mpi3mr_logdata_entry(9)
• struct mpi3mr_bsg_in_log_data(9)
• struct mpi3mr_hdb_entry(9)
• struct mpi3mr_bsg_in_hdb_status(9)
• struct mpi3mr_bsg_out_repost_hdb(9)
• struct mpi3mr_bsg_out_upload_hdb(9)
• struct mpi3mr_bsg_out_refresh_hdb_triggers(9)
• struct mpi3mr_bsg_drv_cmd(9)
• struct mpi3mr_bsg_in_reply_buf(9)
• struct mpi3mr_buf_entry_list(9)
• struct mpi3mr_bsg_mptcmd(9)
• struct mpi3mr_bsg_packet(9)

like, the whole friend group is here 🧚 and yes they all ate. go say hi to each of them, they're all in ./include/uapi/scsi, same neighborhood, same vibe. 💜

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okay that's the page!! 🍓 this beauty lives in ./include/uapi/scsi, dated October 2026, and that's the tea. mwah, go forth and describe your buffers correctly. 🩷💅✨