Re: [PATCH 5 of 13] ipath - use proper address translation routine

[Roland Dreier]

    Arjan> sounds like you need to redesign your layering ;) In linux
    Arjan> it's common to have the lowest level driver do the mapping
    Arjan> (even when the mid layer will provide the most commonly
    Arjan> used helper to do it for the common case)...

It's not that simple of course...

InfiniBand allows RDMA -- _remote_ DMA.  So that address might be
something that a protocol sent to the remote host and which is now
showing up for a DMA operation initiated by the remote side.  And we
can't very well send a struct page * + offset to the remote side...
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