In isert if the we have a single sg entry, we use the local_dma_lkey
just so we can skip a registration (also for protection sg), perhaps
rdma_rw_init_one_mr can do this optimization too?
Can't more than a single SG can be packed into a WR? Ideally this
common code should try and max out the SG entries before falling back
to using a WR?
Mellanox signature MRs don't support registering more than a single SGE.
It can theoretically, but large sg lists can potentially
clog up the send queue in this case, and it would not perform
as well as in the current scheme the driver has a smart
repetition format optimization...
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