On 28-Oct-21 3:09 PM, Anatoly Burakov wrote:
Currently, there is no way to map memory for DMA in a way that allows unmapping it partially later, because some IOMMU's do not support partial unmapping. There is a workaround of mapping all of these segments separately, but this is inconvenient and silly, so this commit adds a proper API that does it.This commit relies on earlier infrastructure that was built out to support "chunking", as the concept of "chunks" is essentially the same as page size. Signed-off-by: Anatoly Burakov <anatoly.bura...@intel.com> --- Notes: v2: - Added checks for page alignment of supplied values - Added rte_errno values (similar to patch 103165 [1])[1] http://patches.dpdk.org/project/dpdk/patch/e8c5e7ba089e2283c3cd67e4529e52fe49390eb9.1635428963.git.anatoly.bura...@intel.com/
I think this API also needs VA and IOVA addresses in an array, so that it's possible to map IOVA-discontiguous segments. This is too late for this release, so let's postpone it till 22.02.
-- Thanks, Anatoly
