Query GID attributes, such as GID type.
Query GID Attributes Experimental Verbs
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ibv_exp_query_gid_attr
Query GID Attributes RDMA-Core Support
GID type can be extracted from the ibsysfs.
Example
Review ibv_query_gid_type, ibv_read_sysfs_file from rdma-core:
https://github.com/linux-rdma/rdma-core/blob/master/libibverbs/verbs.c
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