[openib-general] Extending umad for RMPP support

[Roland Dreier]

    Hal> Currently, the 256 byte MAD is the first field in the
    Hal> ib_user_mad structure. In order to support variable length
    Hal> MADs (for RMPP), I would propose moving this to the end of
    Hal> the struct and supporting a variable size. (Obviously, there
    Hal> are a number of other associated changes with doing this in
    Hal> the code). Just wanted to double check this with you to make
    Hal> sure this approach is acceptable before investing time in
    Hal> doing it.

Yes, that seems to be the only way to do it.

 - R.