Roland Dreier wrote:
I think the right fix for iSER would be to make iSER work even for
devices that don't support FMRs. For example cxgb3 doesn't implement
FMRs so if anyone ever updates iSER to work on iWARP and not just IB,
then this is something that has to be tackled anyway. Then ehca could
just get rid of the FMR support it has.
OK, The iSER design took into account the case of many initiators
running on strong/modern machines talking to possibly lightweight
embedded target for which the processing cost per I/O at the target side
should be minimized, that is at most --one-- RDMA operation should be
issued by the target to serve an I/O request.
For that end, iSER works with one descriptor (called stag in iWARP and
rkey in IB) per I/O direction sent from the initiator to the target and
hence can't work without some sort of FMR implementation.
The current implementation of the open iscsi initiator makes sure to
issue commands in thread (sleepable) context, see iscsi_xmitworker and
references to it in drivers/scsi/libiscsi.c , so this keeps ehca users
safe for the time being.
Or.
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