20. SNOW 3G Crypto Poll Mode Driver
The SNOW3G PMD (librte_crypto_snow3g) provides poll mode crypto driver support for utilizing Intel IPSec Multi-buffer library which implements F8 and F8 functions for SNOW 3G UEA2 cipher and UIA2 hash algorithms.
20.1. Features
SNOW 3G PMD has support for:
Cipher algorithm:
RTE_CRYPTO_CIPHER_SNOW3G_UEA2
Authentication algorithm:
RTE_CRYPTO_AUTH_SNOW3G_UIA2
20.2. Limitations
Chained mbufs are not supported.
SNOW 3G (UIA2) supported only if hash offset field is byte-aligned.
In-place bit-level operations for SNOW 3G (UEA2) are not supported (if length and/or offset of data to be ciphered is not byte-aligned).
20.3. Installation
To build DPDK with the SNOW3G_PMD the user is required to download the multi-buffer library and compile it on their user system before building DPDK.
For x86 system, the multi-buffer library is available here. The latest version of the library supported by this PMD is v1.2, which can be downloaded from https://github.com/01org/intel-ipsec-mb/archive/v1.2.zip.
For Arm system, ARM64 port of the multi-buffer library can be downloaded from https://gitlab.arm.com/arm-reference-solutions/ipsec-mb/-/tree/main/. The latest version of the library supported by this PMD is tagged as SECLIB-IPSEC-2022.05.25.
After downloading the library, the user needs to unpack and compile it on their system before building DPDK:
make
make install
The library requires NASM to be built on x86. Depending on the library version, it might require a minimum NASM version (e.g. v0.54 requires at least NASM 2.14).
NASM is packaged for different OS. However, on some OS the version is too old, so a manual installation is required. In that case, NASM can be downloaded from NASM website. Once it is downloaded, extract it and follow these steps:
./configure
make
make install
Note
Compilation of the Multi-Buffer library is broken when GCC < 5.0, if library <= v0.53. If a lower GCC version than 5.0, the workaround proposed by the following link should be used: https://github.com/intel/intel-ipsec-mb/issues/40.
As a reference, the following table shows a mapping between the past DPDK versions and the external crypto libraries supported by them:
DPDK version |
Crypto library version |
---|---|
16.04 - 19.11 |
LibSSO SNOW3G |
20.02 - 21.08 |
Multi-buffer library 0.53 - 1.2* |
21.11+ |
Multi-buffer library 1.0 - 1.2* |
* Multi-buffer library 1.0 or newer only works for Meson but not Make build system.
20.4. Initialization
In order to enable this virtual crypto PMD, user must:
Build the multi buffer library (explained in Installation section).
To use the PMD in an application, user must:
Call rte_vdev_init(“crypto_snow3g”) within the application.
Use –vdev=”crypto_snow3g” in the EAL options, which will call rte_vdev_init() internally.
The following parameters (all optional) can be provided in the previous two calls:
socket_id: Specify the socket where the memory for the device is going to be allocated (by default, socket_id will be the socket where the core that is creating the PMD is running on).
max_nb_queue_pairs: Specify the maximum number of queue pairs in the device (8 by default).
max_nb_sessions: Specify the maximum number of sessions that can be created (2048 by default).
Example:
./dpdk-l2fwd-crypto -l 1 -n 4 --vdev="crypto_snow3g,socket_id=0,max_nb_sessions=128" \
-- -p 1 --cdev SW --chain CIPHER_ONLY --cipher_algo "snow3g-uea2"