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spdk_ioviter_next will walk through two iovecs and yield pointers to common length segments. For example, given a source iovec (siov) with 4 1KiB elements and a destination iovec (diov) with 1 4KiB element, the following will happen: first spdk_ioviter_next: src = siov[0].iov_base dst = diov[0].iov_base len = 1KiB second spdk_ioviter_next: src = siov[1].iov_base dst = diov[0].iov_base + 1KiB len = 1KiB third spdk_ioviter_next: src = siov[2].iov_base dst = diov[0].iov_base + 2KiB len = 1KiB fourth spdk_ioviter_next: src = siov[3].iov_base dst = diov[0].iov_base + 3KiB len = 1KiB fifth spdk_ioviter_next: len = 0 This is a useful utility for performing operations where both the source and destination are scattered memory. As an example and a test vehicle, spdk_iovcpy has been updated to use this internally. Change-Id: I7e35e76d38e78d07ea1caf6282d0dfc02182aa83 Signed-off-by: Ben Walker <benjamin.walker@intel.com> Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/10284 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Community-CI: Mellanox Build Bot Reviewed-by: Changpeng Liu <changpeng.liu@intel.com> Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com> Reviewed-by: Paul Luse <paul.e.luse@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com> |
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