Re: [PATCH v2 01/17] IB/Verbs: Implement new callback query_transport() for each HW

From: Tom Talpey
Date: Fri Apr 10 2015 - 13:50:25 EST

On 4/10/2015 1:10 PM, Doug Ledford wrote:
As per my above statement, rdma_transport* tests were testing the high
level transport type, rdma_port* types were testing link layers. iWARP
has an Eth link layer, so technically port_is_iwarp makes no sense. But
since all the other types had a check too, I included port_is_iwarp just
to be complete, and if you are going to ask if a specific port is iwarp
as a link layer, it makes sense to say yes if the transport is iwarp,
not if the link layer is eth.

Not wanting to split hairs, but I would not rule out the possibility
of a future device supporting iWARP on one port and another RDMA
protocol on another. One could also imagine softiWARP and softROCE
co-existing atop a single ethernet NIC.

So, I disagree that port_is_iwarp() is a nonsequitur.


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