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05794985b1
Improve the performance of aes_gcm_aad_update_vaes_avx512() on large AAD (additional authenticated data) lengths by 4-8 times by making it use up to 512-bit vectors and a 4-vector-wide loop. Previously, it used only 256-bit vectors and a 1-vector-wide loop. Originally, I assumed that the case of large AADLEN was unimportant. Later, when reviewing the users of BoringSSL's AES-GCM code, I found that some callers use BoringSSL's AES-GCM API to just compute GMAC, authenticating lots of data but not en/decrypting any. Thus, I included a similar optimization in the BoringSSL port of this code. I believe it's wise to include this optimization in the kernel port too for similar reasons, and to align it more closely with the BoringSSL port. Another reason this function originally used 256-bit vectors was so that separate *_avx10_256 and *_avx10_512 versions of it wouldn't be needed. However, that's no longer applicable. To avoid a slight performance regression in the common case of AADLEN <= 16, also add a fast path for that case which uses 128-bit vectors. In fact, this case actually gets slightly faster too, since it saves a couple instructions over the original 256-bit code. Acked-by: Ard Biesheuvel <ardb@kernel.org> Tested-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20251002023117.37504-9-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
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 reStructuredText 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.