24. Virtio Crypto Poll Mode Driver
The virtio crypto PMD provides poll mode driver support for the virtio crypto device.
24.1. Features
The virtio crypto PMD has support for:
Cipher algorithms:
RTE_CRYPTO_CIPHER_AES_CBC
Hash algorithms:
RTE_CRYPTO_AUTH_SHA1_HMAC
24.2. Limitations
- Only supports the session-oriented API implementation (session-less APIs are not supported).
- Only supports modern mode since virtio crypto conforms to virtio-1.0.
- Only has two types of queues: data queue and control queue. These two queues only support indirect buffers to communication with the virtio backend.
- Only supports AES_CBC cipher only algorithm and AES_CBC with HMAC_SHA1 chaining algorithm since the vhost crypto backend only these algorithms are supported.
- Does not support Link State interrupt.
- Does not support runtime configuration.
24.3. Virtio crypto PMD Rx/Tx Callbacks
Rx callbacks:
virtio_crypto_pkt_rx_burst
Tx callbacks:
virtio_crypto_pkt_tx_burst
24.4. Installation
Quick instructions are as follows:
Firstly run DPDK vhost crypto sample as a server side and build QEMU with vhost crypto enabled. QEMU can then be started using the following parameters:
qemu-system-x86_64 \
[...] \
-chardev socket,id=charcrypto0,path=/path/to/your/socket \
-object cryptodev-vhost-user,id=cryptodev0,chardev=charcrypto0 \
-device virtio-crypto-pci,id=crypto0,cryptodev=cryptodev0
[...]
Secondly bind the uio_pci_generic driver for the virtio-crypto device. For example, 0000:00:04.0 is the domain, bus, device and function number of the virtio-crypto device:
modprobe uio_pci_generic
echo -n 0000:00:04.0 > /sys/bus/pci/drivers/virtio-pci/unbind
echo "1af4 1054" > /sys/bus/pci/drivers/uio_pci_generic/new_id
Finally the front-end virtio crypto PMD can be installed.
24.5. Tests
The unit test cases can be tested as below:
reserve enough huge pages
cd to <build_dir>
meson test cryptodev_virtio_autotest
The performance can be tested as below:
reserve enough huge pages
cd to <build_dir>
./app/dpdk-test-crypto-perf -l 0,1 -- --devtype crypto_virtio \
--ptest throughput --optype cipher-then-auth --cipher-algo aes-cbc \
--cipher-op encrypt --cipher-key-sz 16 --auth-algo sha1-hmac \
--auth-op generate --auth-key-sz 64 --digest-sz 12 \
--total-ops 100000000 --burst-sz 64 --buffer-sz 2048