eRPC setup between two docker containers in two different machines

[repo4work]

I am trying to use and setup eRPC between two machines and I’m having issues when calling the RPC constructor. I seem to run into it even in the Hello World application included with the source code and outlined in the README.

I have tried to figure out why, but I haven’t come out with any solutions.

Here is information about the setup:

• There are two machines running RHEL 8.6 with Intel 100GbE Network Adapter (E810-CQDA1), rdma-core version 37, and using Infiniband for transport.
• eRPC is contained in two docker containers, one in each machine, with the following information: CentOS 8 for OS and rdma-core version 26.
• One instance is meant to be the server and the other a client

The error I’m running into says the following and it seems to trigger when the RPC constructor is called:
“terminate called after throwing an instance of ‘std::runtime_error’
What(): Failed to open dev 0
Aborted (core dumped)”

Thanks

[ankalia]

Hi. I haven't tried eRPC on E810 NICs, but here are some thoughts.

• AFAIK E810 does not support InfiniBand, though it supports RoCE. Have you tried building eRPC with DTRANSPORT=ROCE -DLOG_LEVEL=trace? The latter will enable some verbose diagnostics.
• What's the output of ibv_devinfo from the container? Can you successfully run ib_read_bw between the two machines?

[repo4work]

Hi Anuj,

• Is there a difference between doing "-DTRANSPORT=Infiniband -DROCE=on" (which is what I'm currently doing) vs "-DTRANSPORT=ROCE"?
• Output of ibv_devinfo in the containers are: Failed to open device
• ib_read_bw works on the two machines

[ankalia]

Hi.

• DTRANSPORT=Infiniband -DROCE=on is correct.
• It wasn't clear to me if RDMA is working from within the containers. The message says that ib_read_bw works, but is it from within the containers? If so, it's surprising that ibv_devinfo fails but ib_read_bw works.
• If ib_read_bw does not yet work from within the containers, that'll have to be fixed first independently of eRPC.

[repo4work]

Hi,

To clear it up: The ib_read_bw works out of the containers, but does not work inside, along with ibv_devinfo. I am currently looking into the issue within the containers