Re: iblinkinfo for Python

[Leon Romanovsky <leon@kernel.org>]

On Wed, Jan 05, 2022 at 11:32:40AM +0100, Benjamin Drung wrote:
> Hi,
> 
> we have an in-house Shell script that uses iblinkinfo to check if the
> InfiniBand cabling is correct. This information can be derived from the
> node names that can be seen for the HCA port. I want to improve that
> check and rewrite it in Python, but I failed to find an easy and robust
> way to retrieve the node names for a HCA port:
> 
> 1) Call "iblinkinfo --line" and parse the output. Parsing the output
> could probably be done with a complex regular expression. This solution
> is too ugly IMO.
> 
> 2) Extend iblinkinfo to provide a JSON output. Then let the Python
> script call "iblinkinfo --json" and simply use json.load for parsing.
> This solution requires some C coding and probably a good json library
> should be used to avoid generating bogus JSON.
> 
> 3) Use https://github.com/jgunthorpe/python-rdma but this library has
> not been touched for five years and needs porting to Python 3. So that
> is probably a lot of work as well.
> 
> 4) Use pyverbs provided by rdma-core, but I found neither a single API
> call to query similar data to iblinkinfo, nor an example for that use
> case.
> 
> What should I do?

Isn't this information available in sysfs?
[leonro@mtl-leonro-l-vm ~]$ cat /sys/class/infiniband/ibp0s9/node_desc
mtl-leonro-l-vm ibp0s9

Can you give an example?

Thanks

> 
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> Benjamin Drung
> 
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