arm64: enable ossl accelerated AES-GCM on arm64HEADmain

Connect the baseline OpenSSL ARMv8 fused AES-GCM kernels to the OCF
ossl driver. Advertise the algorithm only when the system-wide capability set
includes both AES and PMULL.

Note that get_kernel_reg() is used to detect features such as PMULL
because the ossl device attaches before arm64 populates elf_hwcap when
ossl is built into the kernel or pre-loaded at boot.

Prefer OSSL over armv8crypto for AES-GCM sessions while retaining
armv8crypto as a fallback.

This provides about a 50% speedup for a Netflix ktls workload on a small
neoverse N1 board.

Reviewed by: markj
Constructive review feedback from: andrew, ngie
Differential Revision: https://reviews.freebsd.org/D60097
Sponsored by: Netflix

0 files changed, 0 insertions, 0 deletions