STRUCT IB_USER_MAD_REG_REQ2(9)

✨ NAME ✨

struct ib_user_mad_reg_req2 — the MAD registration request struct, straight from the Kernel API Manual, bestie 💅

🌸 SYNOPSIS 🌸

struct ib_user_mad_reg_req2 {
    __u32 id;
    __u32 qpn;
    __u8 mgmt_class;
    __u8 mgmt_class_version;
    __u16 res;
    __u32 flags;
    __aligned_u64 method_mask[2];
    __u32 oui;
    __u8 rmpp_version;
    __u8 reserved[3];
 };

🎀 Members 🎀

The whole struct squad is up in the synopsis — the tea on each member is right below 👇💖

🧚 Description 🧚

• id — set by the kernel (yes, the kernel handles this part, not you 🌟); userspace uses it to identify the registered agent in future requests.
• qpn — queue pair number; must be 0 or 1 🔥
• mgmt_class — says which management class of MADs the caller should receive. This field is only required if the user wants to receive unsolicited MADs; otherwise it should be 0.
• mgmt_class_version — says which version of MADs for the given management class to receive.
• res — ignored 🙈
• flags — additional registration flags; must be in the set of flags defined in IB_USER_MAD_REG_FLAGS_CAP.
• method_mask — the caller wishes to receive unsolicited MADs for the methods whose bit(s) is(are) set ✨ (it's method_mask[2] up in the struct, iykyk)
• oui — indicates the IEEE OUI to use when mgmt_class is a vendor class in the range from 0x30 to 0x4f. Otherwise not used.
• rmpp_version — if set, indicates the RMPP version to use.
• reserved[3] — it's in the struct, bestie; the original member list doesn't give it its own description, so no invented lore here 🫶

🌈 SEE ALSO 🌈

• Kernel file ./include/uapi/rdma/ib_user_mad.h
• struct ib_user_mad_hdr_old(9)
• struct ib_user_mad_hdr(9)
• struct ib_user_mad(9)
• struct ib_user_mad_reg_req(9)

And that's the whole page, bestie 🫶 this one's from ./include/uapi/rdma, dated October 2026, and it's struct ib_user_mad_reg_req2(9) — periodt 💅✨