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SubjectRE: [PATCH 10/18] ioat3: xor support
Williams, Dan J wrote:
> ioat3.2 adds xor offload support for up to 8 sources. It can also
> perform an xor-zero-sum operation to validate whether all given sources
> sum to zero, without writing to a destination. Xor descriptors differ
> from memcpy in that one operation may require multiple descriptors
> depending on the number of sources. When the number of sources exceeds
> 5 an extended descriptor is needed. These descriptors need to be
> accounted for when updating the DMA_COUNT register.
> Signed-off-by: Dan Williams <>
> ---

Signed-off-by: Maciej Sosnowski <>

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