[Bug 220280] New: mlx5 VF node_guid stays 0 in host

[Bug 220280] New: mlx5 VF node_guid stays 0 in host

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220280

            Bug ID: 220280
           Summary: mlx5 VF node_guid stays 0 in host
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Infiniband/RDMA
          Assignee: drivers_infiniband-rdma@kernel-bugs.osdl.org
          Reporter: axel@gembe.net
        Regression: No

I have a mlx5 setup with switchdev and SR-IOV and I want to make RDMA work
using a VF in the host. VFs attached to a VM work fine, but using the same VF
in the host works for networking but not for RDMA. It seems that this does not
work because the node GUID as shown in `ibv_devices` stays zero. I found a
workaround for this using the following:


> devlink port # find your VF in the list here and copy the id
> devlink port function set pci/0000:10:00.1/65537 hw_addr 72:e4:64:e0:87:a0
> rmmod mlx5_ib
> modprobe mlx5_ib
> ibv_devices # should show a non-zero node_guid for the VF now

https://forums.developer.nvidia.com/t/how-to-use-vf-on-host/277750/4?u=derago

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