[mvapich-discuss] Support of rdma_rename

[Nicolas Morey-Chaisemartin]

Hi,

Starting from rdma-core v24.0 (and a recent enough kernel) RDMA interfaces do not use the usual <vendor>_<x> format anymore (ie mlx5_1) but a more persistent <type><pci_id> format.
However this messes up completely the way mvapich2 detects the interface model as shown below:

# rdma dev
0: ibp0s12: node_type ca fw 12.22.1002 node_guid 248a:0703:0055:4518 sys_image_guid 248a:0703:0055:4504 

## Running a mvapich2 IMB test shows:
[localhost:mpi_rank_0][mv2_get_hca_type] **********************WARNING***********************
[localhost:mpi_rank_0][mv2_get_hca_type] Failed to automatically detect the HCA architecture.
[localhost:mpi_rank_0][mv2_get_hca_type] This may lead to subpar communication performance.
[localhost:mpi_rank_0][mv2_get_hca_type] ****************************************************
[localhost:mpi_rank_0][rdma_open_hca] Unknown HCA type: this build of MVAPICH2 does notfully support the HCA found on the system (try with other build options)

Are you already aware of that issue and maybe already working on it ?
If yes, do you have a patch available (or need help writing one) ?

Regards

Nicolas Morey-Chaisemartin
RDMA/MPI maintainer for SUSE