rdma_udata_to_dev(9)

💅 NAME 💅

rdma_udata_to_dev — bestie, this is the Kernel API Manual moment where we get an ib_device from a udata. Slay.

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✨ SYNOPSIS ✨

struct ib_device * rdma_udata_to_dev (struct ib_udata *udata );

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🎀 ARGUMENTS 🎀

• udata — the ib_udata struct from the system call. It's the little info package the syscall brings to the function party, iykyk.

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🦋 DESCRIPTION 🦋

Okay so this function gives you the struct ib_device that’s handling the uverbs call. It’s giving backstage pass to the device doing the work, periodt.

🚨 Do NOT call this if udata is NULL. Like, not even a tiny bit. That’s the rule, no cap.

Also important: the result can be NULL. So don’t just assume a device is gonna pop out looking all shiny — it might be a whole NULL situation. Vibe check required. 💀

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🌈 SEE ALSO 🌈

The kernel file lore lives here: ./drivers/infiniband/core/ib_core_uverbs.c

• 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)
• _uverbs_alloc(9)
• uverbs_get_buffer_desc(9)

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💖 cute little sign-off time: source/version vibes are ./drivers/infiniband/core, date is October 2026, and this iconic page is rdma_udata_to_dev(9). 🫶✨