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The ZLIB format (RFC 1950) is made of deflate compressed data surrounded
by a header and a footer. The QAT accelerators support only the deflate
algorithm, therefore the header and the footer need to be inserted in
software.
This adds logic in the QAT driver to support the ZLIB format. In
particular:
* Generalize the function qat_comp_alg_compress_decompress() to allow
skipping an initial region (header) of the source and/or destination
scatter lists.
* Add logic to register the qat_zlib_deflate algorithm into the acomp
framework.
* For ZLIB compression, skip the initial portion of the destination
buffer before sending the job to the QAT accelerator and insert the
ZLIB header and footer in the callback, after the QAT request has
been processed.
* For ZLIB decompression, parse the header in the input buffer
provided by the user and verify its validity before attempting the
decompression of the buffer with QAT. Then submit the buffer to QAT
for decompression. In the callback verify the correctness of the
footer by comparing the value of the ADLER produced by QAT with the
one in the destination buffer.
Signed-off-by: Lucas Segarra Fernandez <lucas.segarra.fernandez@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.