如何在iMX8MP中测试OpenSSL硬件卸载？

我使用的是 iMX8MP EVK 和 imx-yocto-L5.10.52。
首先，测试openssl：


root@imx8mpevk:~# openssl speed sha256
Doing sha256 for 3s on 16 size blocks: 11536688 sha256's in 3.00s
Doing sha256 for 3s on 64 size blocks: 8664550 sha256's in 3.00s
Doing sha256 for 3s on 256 size blocks: 5114298 sha256's in 2.99s
Doing sha256 for 3s on 1024 size blocks: 1932152 sha256's in 3.00s
Doing sha256 for 3s on 8192 size blocks: 284675 sha256's in 3.00s
Doing sha256 for 3s on 16384 size blocks: 144224 sha256's in 3.00s
OpenSSL 1.1.1k  25 Mar 2021
built on: Thu Mar 25 13:28:38 2021 UTC
options:bn(64,64) rc4(char) des(int) aes(partial) blowfish(ptr)
compiler: aarch64-poky-linux-gcc  -mcpu=cortex-a53 -march=armv8-a+crc+crypto -fstack-protector-strong  -O2 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security --sysroot=recipe-sysroot -O2 -pipe -g -feliminate-unused-debug-types -fmacro-prefix-map=                      -fdebug-prefix-map=                      -fdebug-prefix-map=                      -fdebug-prefix-map=  -DOPENSSL_USE_NODELETE -DOPENSSL_PIC -DOPENSSL_CPUID_OBJ -DOPENSSL_BN_ASM_MONT -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DKECCAK1600_ASM -DVPAES_ASM -DECP_NISTZ256_ASM -DPOLY1305_ASM -DNDEBUG
The 'numbers' are in 1000s of bytes per second processed.
type             16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes  16384 bytes
sha256           61529.00k   184843.73k   437879.69k   659507.88k   777352.53k   787655.34k


然后，使用 cryptodev 引擎测试 openssl：


root@imx8mpevk:~# modprobe cryptodev
[  151.419636] cryptodev: loading out-of-tree module taints kernel.
[  151.420713] cryptodev: driver 1.12 loaded.
root@imx8mpevk:~# openssl engine
(devcrypto) /dev/crypto engine
(dynamic) Dynamic engine loading support
root@imx8mpevk:~# openssl speed -engine devcrypto sha256
engine "devcrypto" set.
Doing sha256 for 3s on 16 size blocks: 11536289 sha256's in 3.00s
Doing sha256 for 3s on 64 size blocks: 8664651 sha256's in 3.00s
Doing sha256 for 3s on 256 size blocks: 5114791 sha256's in 3.00s
Doing sha256 for 3s on 1024 size blocks: 1917203 sha256's in 2.99s
Doing sha256 for 3s on 8192 size blocks: 284712 sha256's in 3.00s
Doing sha256 for 3s on 16384 size blocks: 144242 sha256's in 3.00s
OpenSSL 1.1.1k  25 Mar 2021
built on: Thu Mar 25 13:28:38 2021 UTC
options:bn(64,64) rc4(char) des(int) aes(partial) blowfish(ptr)
compiler: aarch64-poky-linux-gcc  -mcpu=cortex-a53 -march=armv8-a+crc+crypto -fstack-protector-strong  -O2 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security --sysroot=recipe-sysroot -O2 -pipe -g -feliminate-unused-debug-types -fmacro-prefix-map=                      -fdebug-prefix-map=                      -fdebug-prefix-map=                      -fdebug-prefix-map=  -DOPENSSL_USE_NODELETE -DOPENSSL_PIC -DOPENSSL_CPUID_OBJ -DOPENSSL_BN_ASM_MONT -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DKECCAK1600_ASM -DVPAES_ASM -DECP_NISTZ256_ASM -DPOLY1305_ASM -DNDEBUG
The 'numbers' are in 1000s of bytes per second processed.
type             16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes  16384 bytes
sha256           61526.87k   184845.89k   436462.17k   656593.94k   777453.57k   787753.64k

测试结果一样！
为什么 cryptodev 没有提高 openssl 的性能？
如何测试 caam 对 openssl 的性能提升？