Ideally, the post contains a chain of all 4 registrations and the
rdma_read (and an opportunistic good scsi response).

Just to be clear: This example is for IB only, correct?  IW would
require rkeys with REMOTE_WRITE and 4 read wrs.

My assumption is that it would depend on max_sge_rd.

IB only? iWARP by definition isn't capable of doing rdma_read to
more than one scatter? Anyway, we'll need to calculate the number
of RDMA_READs.

And you're ignoring invalidation wrs (or read-with-inv) in the example...

Yes, didn't want to inflate the example too much...
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