The overall approach looks fine to me, although I'm not the arbiter of
taste for the DMA API.
However, I think this wants to be split into at least three parts for
merging: adding the dmaflush flags stuff into the DMA API; adding the
dmaflush parameter to the ib_umem_get() API (and fixing every ca
Altix supports "posted DMA", so that DMA may complete out
of order. In some cases it's necessary for a driver to
ensure that in-flight DMA has been flushed to memory for
correct operation.
In particular this can be a problem with Infiniband, where
writes to Completion Queues can race with DMA
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