ib_copy_validate_udata_in(9)

💖 ib_copy_validate_udata_in(9) 💖

okay bestie, so this one's from the Kernel API Manual and it's literally the function that copies and validates that your request struct is compatible with this kernel. no cap. 🎀

✨ SYNOPSIS ✨

ib_copy_validate_udata_in (_udata , _req , _end_member );

🦋 ARGUMENTS 🦋

• _udata — the system call's ib_udata struct. yep, that one. 💅
• _req — the name of an on-stack structure that holds the driver data. it's giving "pass me the name, not the thing" energy fr fr 🫶
• _end_member — the member in the struct that's, like, the original end of the struct from the first kernel to ever introduce it. so iconic for backwards compat 👑

🌸 DESCRIPTION 🌸

so what it does is: it checks that the udata input request struct is properly formed for this kernel (vibe check ✅), and then it copies it into req. that's it. that's the whole slay. 💖

💜 SEE ALSO 💜

• kernel file ./include/rdma/uverbs_ioctl.h
• uverbs_attr_get_uobjs_arr(9)
• ib_copy_validate_udata_in_cm(9)
• ib_is_udata_in_empty(9)
• ib_respond_udata(9)
• ib_respond_empty_udata(9)
• ib_no_udata_io(9)

ngl bestie, this is a macro-style thing, so the underscores in the synopsis are doing the heavy lifting. keep them exactly as they are or the whole thing won't compile and you'll be sad. 😭

✨ this slay of a function lives in ./include/rdma and the page is from October 2026 ✨ mwah, go forth and validate those udata structs, queen 💅🌈