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RFC: config-linux: add an initial spec of RDMA related field #930

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RFC: config-linux: add an initial spec of RDMA related field #930

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24 changes: 24 additions & 0 deletions config-linux.md
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Expand Up @@ -637,6 +637,29 @@ The following parameters can be specified to set up seccomp:
"mountLabel": "system_u:object_r:svirt_sandbox_file_t:s0:c715,c811"
```

### <a name="configLinuxRdmaLimits" />RDMA resource limits

**`rdma_limits`** (array of objects, OPTIONAL) limits resources for network interfaces which support RDMA (e.g. HCA handles).
For more information, see the [the kernel RMDA controller documentation][cgroup-v1-rdma].

Each entry has the following structure:

* **`interface_name`** (string, REQUIRED) - A name of an interface.
* **`hca_handle_limit`** (int64, REQUIRED) - Maximum number of HCA Handles (use `-1` to request the maximum available).
* **`hca_object_limit`** (int64, REQUIRED) - Maximum number of HCA Objects (use `-1` to request the maximum available).
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@wking wking Dec 7, 2017

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From the kernel docs, I think hca_handle_limit and hca_object_limit should both be OPTIONAL, possibly with a requirement that at least one of them be set (this is the same suggestion I made for #942 here).


#### Example

```json
"rdma_limits": [
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@wking wking Dec 7, 2017

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You'll want to drop the leading indent from this block to catch up with #937.

{
"interface_name": "mlx5_0",
"hca_handle_limit": 1,
"hca_object_limit": 20
}
]
```


[cgroup-v1]: https://www.kernel.org/doc/Documentation/cgroup-v1/cgroups.txt
[cgroup-v1-blkio]: https://www.kernel.org/doc/Documentation/cgroup-v1/blkio-controller.txt
Expand All @@ -647,6 +670,7 @@ The following parameters can be specified to set up seccomp:
[cgroup-v1-net-cls]: https://www.kernel.org/doc/Documentation/cgroup-v1/net_cls.txt
[cgroup-v1-net-prio]: https://www.kernel.org/doc/Documentation/cgroup-v1/net_prio.txt
[cgroup-v1-pids]: https://www.kernel.org/doc/Documentation/cgroup-v1/pids.txt
[cgroup-v1-rdma]: https://www.kernel.org/doc/Documentation/cgroup-v1/rdma.txt
[cgroup-v2]: https://www.kernel.org/doc/Documentation/cgroup-v2.txt
[devices]: https://www.kernel.org/doc/Documentation/admin-guide/devices.txt
[devpts]: https://www.kernel.org/doc/Documentation/filesystems/devpts.txt
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