[dpdk-dev] [PATCH 3/3] doc: update ISA-L guide to reflect checksum support

Trahe, Fiona fiona.trahe at intel.com
Thu Oct 11 12:04:01 CEST 2018


Hi Lee,

> +If you request a checksum for compression, the checksum field in the operation
> +structure, ``op->input_chksum``, will be filled with the checksum of the input data.
> +
[Fiona] This is not correct - the checksum will always be in the op->output_chksum
The input_chksum field is for generating a checksum across the uncompressed data of multiple related ops

> +If you request a checksum for decompression, the checksum field in the operation
> +structure, ``op->output_chksum``, will be filled with the checksum of the output data.
> +
> +.. Note::
> +
> + For the compression case above, your output buffer will need to be large enough to hold the compressed
> data plus a scratchpad for the checksum at the end, the scratchpad is 8 bytes for CRC32 and 4 bytes for
> Adler32.
[Fiona] In the compression case is there no need for this scratchpad?




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