blktests: changing rdma default driver from rdma_rxe to siw

[Shinichiro Kawasaki]

On Sep 13, 2023 / 10:25, Shinichiro Kawasaki wrote:
> Hello blktests users,
> 
> When you run blktests test "nvme" group with nvme_trtype=rdma, or "srp" (scsi
> rdma protocol) test group, rdma_rxe is used as the default driver for rdma
> transport. Recently, some test case failures were observed with the rdma_rxe
> driver [1], and it is being suggested to change the default driver from
> rdma_rxe to siw, which is more stable.
> 
> A new GitHub pull request is created for this change and now under review [2].
> If you don't care the rdma transport driver choice, this change will not affect
> your test runs of "nvme" and "srp" groups. If you care the driver choice, please
> be aware of the suggested change. After the change, the config option "use_siw"
> will be obsolete and "use_rxe" config option will be introduced.
> 
> [1] https://lore.kernel.org/linux-rdma/8be8f611-e413-9584-7c2e-2c1abf4147be@acm.org/
> [2] https://github.com/osandov/blktests/pull/125

FYI, the change has been merged. The default rdma transport driver is siw. Now
"use_rxe" config option is available, and "use_siw" config option is obsolete.