STRUCT MPI3MR_HDB_ENTRY(9)

💖 struct mpi3mr_hdb_entry(9) 💖

okay so bestie, we're deep in the Kernel API Manual today and this one is literally the host diag buffer entry — yes, that one. it's giving "small struct, big responsibilities" and honestly? iconic. let's get into it 🫶

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✨ NAME ✨

struct mpi3mr_hdb_entry — host diag buffer entry. that's it, that's the whole vibe. a single entry in the host diagnostic buffer. no cap 💅

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🌸 SYNOPSIS 🌸

struct mpi3mr_hdb_entry {
    __u8 buf_type;
    __u8 status;
    __u8 trigger_type;
    __u8 rsvd1;
    __u16 size;
    __u16 rsvd2;
    __u64 trigger_data;
    __u32 rsvd3;
    __u32 rsvd4;
 };

look at her. all those __u8s lined up like a little squad 🎀 and yes, the closing brace really does have that extra space in front of it in the original — we don't fix, we respect 😌

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🦋 Members 🦋

• buf_type — the buffer type. what kind of buffer are we even talking about? this tells you. main character field ngl 👑
• status — the buffer status. the vibe check of the buffer, fr fr.
• trigger_type — the trigger type. because things gotta get triggered somehow ✨
• rsvd1 — reserved. not for you, bestie 🙈
• size — the buffer size. how big is the buffer? this. that's the whole answer.
• rsvd2 — reserved. again. hands off 💅
• trigger_data — trigger specific data. the actual payload of the trigger, iykyk 🔥
• rsvd3 — reserved. we're three for three on the "don't touch" pile.
• rsvd4 — reserved. the final boss of reserved fields 💀

lowkey obsessed with how many reserved fields there are. the kernel said "leave room for the future" and she MEANT it 🌈

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⭐ SEE ALSO ⭐

kernel file ./include/uapi/scsi/scsi_bsg_mpi3mr.h and the whole friend group:

• 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_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(9)
• struct mpi3mr_buf_entry_list(9)
• struct mpi3mr_bsg_mptcmd(9)
• struct mpi3mr_bsg_packet(9)

that's a lot of siblings but they all ate, periodt 🍓

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and that's the page!! sourced straight from ./include/uapi/scsi, dated October 2026 — go off, future manual 💜 stay hydrated, read your headers, and remember: reserved means reserved 😭✨