* Older versions of libusnic_verbs actually return 0 when querying for
an unknown port. So also check for a magic ID in the returned data
to *really* know if the usnic extensions are supported.
* Use a union (in the common_verbs area) and memcpy (in the btl) to
avoid undefined C type aliasing behavior.
* Ensure to memset the function table to 0 if the usnic extensions
are not supported.
Submitted by Jeff Squyres, reviewed by Dave Goodell.
cmr=v1.7.5:reviewer=ompi-rm1.7
This commit was SVN r30935.
If they exist, call the usnic verbs extensions to both enable UDP
support and get the UD receiver header length that should be used
(rather than assume 40/struct GRH).
This commit was SVN r30912.
