28. OCTEONTX Poll Mode driver
The OCTEONTX ETHDEV PMD (librte_pmd_octeontx) provides poll mode ethdev driver support for the inbuilt network device found in the Cavium OCTEONTX SoC family as well as their virtual functions (VF) in SR-IOV context.
More information can be found at Cavium, Inc Official Website.
28.1. Features
Features of the OCTEONTX Ethdev PMD are:
- Packet type information
- Promiscuous mode
- Port hardware statistics
- Jumbo frames
- Link state information
- SR-IOV VF
- Multiple queues for TX
- Lock-free Tx queue
- HW offloaded ethdev Rx queue to eventdev event queue packet injection
28.2. Supported OCTEONTX SoCs
- CN83xx
28.3. Unsupported features
The features supported by the device and not yet supported by this PMD include:
- Receive Side Scaling (RSS)
- Scattered and gather for TX and RX
- Ingress classification support
- Egress hierarchical scheduling, traffic shaping, and marking
28.4. Prerequisites
See OCTEONTX Board Support Package for setup information.
28.5. Pre-Installation Configuration
28.5.1. Config File Options
The following options can be modified in the config
file.
Please note that enabling debugging options may affect system performance.
CONFIG_RTE_LIBRTE_OCTEONTX_PMD
(defaulty
)Toggle compilation of the
librte_pmd_octeontx
driver.
28.5.2. Driver compilation and testing
Refer to the document compiling and testing a PMD for a NIC for details.
To compile the OCTEONTX PMD for Linux arm64 gcc target, run the
following make
command:
cd <DPDK-source-directory>
make config T=arm64-thunderx-linuxapp-gcc install
Running testpmd:
Follow instructions available in the document compiling and testing a PMD for a NIC to run testpmd.
Example output:
./arm64-thunderx-linuxapp-gcc/app/testpmd -c 700 \ --base-virtaddr=0x100000000000 \ --mbuf-pool-ops-name="octeontx_fpavf" \ --vdev='event_octeontx' \ --vdev='eth_octeontx,nr_port=2' \ -- --rxq=1 --txq=1 --nb-core=2 \ --total-num-mbufs=16384 -i ..... EAL: Detected 24 lcore(s) EAL: Probing VFIO support... EAL: VFIO support initialized ..... EAL: PCI device 0000:07:00.1 on NUMA socket 0 EAL: probe driver: 177d:a04b octeontx_ssovf ..... EAL: PCI device 0001:02:00.7 on NUMA socket 0 EAL: probe driver: 177d:a0dd octeontx_pkivf ..... EAL: PCI device 0001:03:01.0 on NUMA socket 0 EAL: probe driver: 177d:a049 octeontx_pkovf ..... PMD: octeontx_probe(): created ethdev eth_octeontx for port 0 PMD: octeontx_probe(): created ethdev eth_octeontx for port 1 ..... Configuring Port 0 (socket 0) Port 0: 00:0F:B7:11:94:46 Configuring Port 1 (socket 0) Port 1: 00:0F:B7:11:94:47 ..... Checking link statuses... Port 0 Link Up - speed 40000 Mbps - full-duplex Port 1 Link Up - speed 40000 Mbps - full-duplex Done testpmd>
28.6. Initialization
The octeontx ethdev pmd is exposed as a vdev device which consists of a set of PKI and PKO PCIe VF devices. On EAL initialization, PKI/PKO PCIe VF devices will be probed and then the vdev device can be created from the application code, or from the EAL command line based on the number of probed/bound PKI/PKO PCIe VF device to DPDK by
- Invoking
rte_vdev_init("eth_octeontx")
from the application - Using
--vdev="eth_octeontx"
in the EAL options, which will call rte_vdev_init() internally
28.6.1. Device arguments
Each ethdev port is mapped to a physical port(LMAC), Application can specify
the number of interesting ports with nr_ports
argument.
28.6.2. Dependency
eth_octeontx
pmd is depend on event_octeontx
eventdev device and
octeontx_fpavf
external mempool handler.
Example:
./your_dpdk_application --mbuf-pool-ops-name="octeontx_fpavf" \
--vdev='event_octeontx' \
--vdev="eth_octeontx,nr_port=2"
28.7. Limitations
28.7.1. octeontx_fpavf
external mempool handler dependency
The OCTEONTX SoC family NIC has inbuilt HW assisted external mempool manager.
This driver will only work with octeontx_fpavf
external mempool handler
as it is the most performance effective way for packet allocation and Tx buffer
recycling on OCTEONTX SoC platform.
28.7.2. CRC striping
The OCTEONTX SoC family NICs strip the CRC for every packets coming into the host interface irrespective of the offload configuration.
28.7.3. Maximum packet length
The OCTEONTX SoC family NICs support a maximum of a 32K jumbo frame. The value
is fixed and cannot be changed. So, even when the rxmode.max_rx_pkt_len
member of struct rte_eth_conf
is set to a value lower than 32k, frames
up to 32k bytes can still reach the host interface.