4. ARMv8 Crypto Poll Mode Driver
This code provides the initial implementation of the ARMv8 crypto PMD. The driver uses ARMv8 cryptographic extensions to process chained crypto operations in an optimized way. The core functionality is provided by a low-level library, written in the assembly code.
4.1. Features
ARMv8 Crypto PMD has support for the following algorithm pairs:
Supported cipher algorithms:
RTE_CRYPTO_CIPHER_AES_CBC
Supported authentication algorithms:
RTE_CRYPTO_AUTH_SHA1_HMAC
RTE_CRYPTO_AUTH_SHA256_HMAC
4.2. Installation
To build DPDK with this virtual crypto PMD, the user is required to:
- Download AArch64 crypto library source code from here.
- Build the
AArch64cryptolib
library:
make
- Add path to libAArch64crypto.pc in PKG_CONFIG_PATH environment variable:
export PKG_CONFIG_PATH=<path_to_AArch64cryptolib>/pkgconfig/:$PKG_CONFIG_PATH
- Build DPDK:
meson setup build
ninja -C build
The corresponding device can be created only if the following features are supported by the CPU:
RTE_CPUFLAG_AES
RTE_CPUFLAG_SHA1
RTE_CPUFLAG_SHA2
RTE_CPUFLAG_NEON
4.3. Initialization
Use --vdev "crypto_armv8"
in the EAL options to create virtual crypto device.
User can use app/test application to check how to use this PMD and to verify crypto processing.
Test name is cryptodev_sw_armv8_autotest.
4.4. Limitations
- Maximum number of sessions is 2048.
- Only chained operations are supported.
- AES-128-CBC is the only supported cipher variant.
- Cipher input data has to be a multiple of 16 bytes.
- Digest input data has to be a multiple of 8 bytes.