STRUCT MPT3_DIAG_REGISTER(9)

💅 struct mpt3_diag_register(9) — the Kernel API Manual tea 🎀

okay so bestie, welcome to the struct mpt3_diag_register(9) page from the Kernel API Manual ✨ this is the one where we register an application with the driver, and honestly? it's giving "VIP list at the firmware club" 🫶

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🌸 NAME 🌸

struct mpt3_diag_register — application register with driver 💖

Let's break down every single field so you're not out here confused in the group chat:

• @hdr — generic header
• @reserved — reserved (yes, it's just vibing there, don't touch it 💀)
• @buffer_type — specifies either TRACE, SNAPSHOT, or EXTENDED
• @application_flags — misc flags
• @diagnostic_flags — specifies flags affecting command processing
• @product_specific — product specific information
• @requested_buffer_size — buffers size in bytes
• @unique_id — tag specified by application that is used to signal ownership of the buffer

no cap, that's the whole roster 👑

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✨ SYNOPSIS ✨

struct mpt3_diag_register {
    struct mpt3_ioctl_header hdr;
    uint8_t reserved;
    uint8_t buffer_type;
    uint16_t application_flags;
    uint32_t diagnostic_flags;
    uint32_t product_specific[MPT3_PRODUCT_SPECIFIC_DWORDS];
    uint32_t requested_buffer_size;
    uint32_t unique_id;
 };

like, look at her. iconic. main character struct energy 🌈

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🦋 Members 🦋

this is where the members live — all the deets for each field are spelled out up in NAME, so scroll back up if you skipped it (and I know some of you skipped it 🙈). @hdr, @reserved, @buffer_type, @application_flags, @diagnostic_flags, @product_specific, @requested_buffer_size, @unique_id — every single one, accounted for 💜

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🍓 Description 🍓

This will allow the driver to setup any required buffers that will be needed by firmware to communicate with the driver. literally that's the whole point, and it ate 🔥

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🌟 SEE ALSO 🌟

go read the whole friend group, they're all linked 💫

Kernel file ./drivers/scsi/mpt3sas/mpt3sas_ctl.h:

• struct mpt3_ioctl_header(9)
• struct mpt3_ioctl_diag_reset(9)
• struct mpt3_ioctl_pci_info(9)
• struct mpt3_ioctl_iocinfo(9)
• struct mpt3_ioctl_eventquery(9)
• struct mpt3_ioctl_eventenable(9)
• struct MPT3_IOCTL_EVENTS(9)
• struct mpt3_ioctl_eventreport(9)
• struct mpt3_ioctl_command(9)
• struct mpt3_ioctl_btdh_mapping(9)
• struct mpt3_diag_unregister(9)
• struct mpt3_diag_query(9)
• struct mpt3_diag_release(9)
• struct mpt3_diag_read_buffer(9)
• struct mpt3_addnl_diag_query(9)
• struct mpt3_enable_diag_sbr_reload(9)
• struct mpt3_passthru_command(9)

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💖 cute sign-off time: this page came from ./drivers/scsi/mpt3sas, dated October 2026, and it's still titled struct mpt3_diag_register(9) because we keep the branding consistent, periodt 👑✨