4875f48eaa
This commit decouples OMPI deployment from the version(s) of the lower layers of the stack by probing for UDP support. Verbs applications assume a 40-byte header (there is no current mechanism for querying payload offset). So to support a 42-byte UDP header without causing existing applications like ibv_ud_pingpong or older versions of OMPI to crash, we must inform libusnic_verbs that we are aware of the nonstandard payload offset. We do this by overriding the `transport_type` field of the device to be 42 before calling `ibv_open_device`. If the library resets it to something else, then we know the lower layers are UDP capable. Otherwise we use the older custom-L2 format. This necessitated some minor ugliness in common_verbs, but it's as tidy as Jeff and I know how to make it right now. This commit only adds support for UDP headers and connectivity over the same L2 network, it does not touch routing or interface pairing. Reviewed-by: Jeff Squyres <jsquyres@cisco.com> cmr=v1.7.5:ticket=trac:4253 This commit was SVN r30838. The following Trac tickets were found above: Ticket 4253 --> https://svn.open-mpi.org/trac/ompi/ticket/4253 |
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