Am Mittwoch, dem 05.01.2022 um 13:52 +0200 schrieb Leon Romanovsky: > 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 The host names of the nodes connected to this port are required for this check, not the host name of the host itself. > Can you give an example? ``` $ sudo iblinkinfo -y 1 -C mlx5_0 -P 0 --line 0x04400C64D87A2543 " host1 mlx5_0" 13 [...] 0x04400C64D87A255c " host2 mlx5_0" 10 [...] [...] ``` iblinkinfo would return the host names of all connected hosts (in this example snippet "host1" and "host2"). In our inhouse case, we can derive the topology from these host names. > -- Benjamin Drung Senior DevOps Engineer and Debian & Ubuntu Developer Compute Platform Operations Cloud IONOS SE | Revaler Str. 30 | 10245 Berlin | Deutschland E-Mail: benjamin.drung@xxxxxxxxx | Web: www.ionos.de Hauptsitz Montabaur, Amtsgericht Montabaur, HRB 24498 Vorstand: Hüseyin Dogan, Dr. Martin Endreß, Claudia Frese, Henning Kettler, Arthur Mai, Britta Schmidt, Achim Weiß Aufsichtsratsvorsitzender: Markus Kadelke Member of United Internet
