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On 32-bit ARM, AES in GCM mode takes full advantage of the ARMv8 Crypto Extensions when available, resulting in a performance of 6-7 cycles per byte for typical IPsec frames on cores such as Cortex-A53, using the generic GCM template encapsulating the accelerated AES-CTR and GHASH implementations. At such high rates, any time spent copying data or doing other poorly optimized work in the generic layer hurts disproportionately, and we can get a significant performance improvement by combining the optimized AES-CTR and GHASH implementations into a single GCM driver. On Cortex-A53, this results in a performance improvement of around 75%, and AES-256-GCM-128 with RFC4106 encapsulation runs in 4 cycles per byte. Note that this code takes advantage of the fact that kernel mode NEON is now supported in softirq context as well, and therefore does not provide a non-NEON fallback path at all. (AEADs are only callable in process or softirq context) Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
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.