Add an new option to let users choose PRP or SGL for I/O commands,
for SGL, users can append `-enable_sgl=1` when starting fio tests.
PRP is used by default.
Change-Id: Ic28c85c95fdd92d4bbe8a02616686b57e91e7271
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-on: https://review.gerrithub.io/407251
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ziye Yang <optimistyzy@gmail.com>
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