rdma_cap_af_ib(9)

📦 version 7.3.1, in nixpkgs unstable

🌸 NAME 🌸

okay bestie, welcome to rdma_cap_af_ib(9) from the Kernel API Manual ✨ — and its whole entire job is checking if the port of device has the capability Native Infiniband Address. That’s the vibe, that’s the function, periodt 💅.

✨ SYNOPSIS ✨

here’s the exact signature, no cap:

bool rdma_cap_af_ib (const struct ib_device *device , u32 port_num );

🎀 ARGUMENTS 🎀

  • device — Device to check. Like, the device we’re checking, obviously 🫶.
  • port_num — Port number to check. Which port we’re asking about, bestie.

🦋 DESCRIPTION 🦋

okay so real talk: InfiniBand addressing uses a port’s GUID + Subnet Prefix to make a default GID 👑. RoCE is out here using a different mechanism, but it still generates a GID via a prescribed mechanism and port specific data. Different route, same little address-making moment ✨.

💖 RETURN 💖

It gives you true if the port uses a GID address to identify devices on the network. That’s the whole return situation, iconic and simple 🌸.

🌈 SEE ALSO 🌈

the whole friend group is here — do not skip a single one, bestie 💜:

xoxo, your kernel bestie 🫶 — this page is from source/version ./include/rdma, dated October 2026, and yes it lives in the Kernel API Manual 💅✨.

📦 where this page comes from