uverbs_get_buffer_desc(9)

💅 uverbs_get_buffer_desc(9)

okay so bestie, you know how we're always like "just grab the buffer descriptor from the uverbs attr" — this is that function, and it's from the Kernel API Manual (kernel API girlies rise 🧚). Lowkey iconic little helper, no cap.

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✨ NAME ✨

uverbs_get_buffer_desc — literally reads a buffer descriptor out of a uverbs attr. that's it, that's the whole vibe 🫶

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🌸 SYNOPSIS 🌸

int uverbs_get_buffer_desc (const struct uverbs_attr_bundle
*attrs_bundle , u16 attr_id , struct ib_uverbs_buffer_desc *desc );

copy it exactly, babes, don't get cute with the types 💖

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🎀 ARGUMENTS 🎀

• attrs_bundle — the uverbs attribute bundle. yeah. that one. it's const, so hands off 🔥
• attr_id — the id of an UVERBS_ATTR_UMEM-typed attribute. must be that type, iykyk 👑
• desc — the descriptor you're filling in. it's giving output parameter energy, main character slot right there 💅

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⭐ RETURN ⭐

So here's the vibe check on return values:

• 0 on success — slay, we ate 🍓
• -ENOENT if attr_id is not set. it's just… not there. ghosted 💀
• -EINVAL on a malformed descriptor — that descriptor did NOT pass the vibe check 😭
• any other negative errno propagated from uverbs_copy_from — and notably -EFAULT on copy_from_user failure 🙈

fr fr, if you see anything other than 0, go read what came back before you keep going. no cap.

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🦋 SEE ALSO 🦋

• Kernel file ./drivers/infiniband/core/ib_core_uverbs.c — the source, go look at it, it's right there 🧚
• rdma_umap_priv_init(9)
• rdma_user_mmap_io(9)
• rdma_user_mmap_entry_get_pgoff(9)
• rdma_user_mmap_entry_get(9)
• rdma_user_mmap_entry_put(9)
• rdma_user_mmap_entry_remove(9)
• rdma_user_mmap_entry_insert_range(9)
• rdma_user_mmap_entry_insert(9)
• rdma_udata_to_dev(9)
• _uverbs_alloc(9)

like a whole friend group of mmap entry functions, honestly obsessed 🌈

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and that's the page, bestie 💜 came to you from ./drivers/infiniband/core, dated October 2026, and yes it's still uverbs_get_buffer_desc(9) — periodt. ✨🎀