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rdma-verbs

Use when programming InfiniBand or RoCE with libibverbs: device setup, memory registration, queue pairs, send/recv or RDMA write, completion polling, or perftest benchmarks. Not for MPI: use mpi.

.devin/skills/rdma-verbs/SKILL.md

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# RDMA verbs

libibverbs (rdma-core) exposes the network adapter's queues to user space. A program registers memory once, posts work requests to a queue pair, and reads completions from a completion queue; the kernel is out of the data path. Two-sided operations (`IBV_WR_SEND` with a posted receive) involve both CPUs; one-sided operations (`IBV_WR_RDMA_WRITE`, `IBV_WR_RDMA_READ`) touch remote memory without the remote CPU. The same API runs over InfiniBand fabrics and over RoCE on Ethernet.

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The user builds low-latency networking or storage on RDMA, needs a queue pair brought to a connected state, debugs a completion error, or wants fabric bandwidth and latency numbers from perftest. |
| Authority | Reversible local: writes only C or Rust source files and their build outputs in the working directory; rollback is deleting them. Kernel module loads, `rdma link add`, switch configuration, and `ulimit` changes are proposed to the user, never applied. No remote mutation. |
| Side effect | Source and binaries on disk. perftest runs traffic between two hosts the user names. |
| Done | The program registers memory, creates a queue pair, moves it through `INIT`, `RTR`, and `RTS`, exchanges data, and every completion is checked against `IBV_WC_SUCCESS`; or the benchmark numbers are recorded with device, GID index, and message size. |

## Inputs