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Even if the code for single iovec case is removed, no performance difference was observed when inserting/striping DIF for iSCSI target. And the subsequent patches will add more complex operation and hence simplifying the code before them will be valuable. So this patch merges dif_set_md_interleave_iovs and dif_set_md_interleave_iovs_split into the latter. Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com> Change-Id: I784b9e04f0983ed91c7aa66bbc7ceaed4406e3ac Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/457758 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Changpeng Liu <changpeng.liu@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com> Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>