23. SZEDATA2 poll mode driver library
The SZEDATA2 poll mode driver library implements support for the Netcope FPGA Boards (NFB-*), FPGA-based programmable NICs. The SZEDATA2 PMD uses interface provided by the libsze2 library to communicate with the NFB cards over the sze2 layer.
This driver has external dependencies.
Therefore it is disabled in default configuration files.
It can be enabled by setting
Currently the driver is supported only on x86_64 architectures. Only x86_64 versions of the external libraries are provided.
This PMD requires kernel modules which are responsible for initialization and allocation of resources needed for sze2 layer function. Communication between PMD and kernel modules is mediated by libsze2 library. These kernel modules and library are not part of DPDK and must be installed separately:
The library provides API for initialization of sze2 transfers, receiving and transmitting data segments.
Kernel modules manage initialization of hardware, allocation and sharing of resources for user space applications.
Information about getting the dependencies can be found here.
These configuration options can be modified before compilation in the
CONFIG_RTE_LIBRTE_PMD_SZEDATA2default value: n
Value y enables compilation of szedata2 PMD.
CONFIG_RTE_LIBRTE_PMD_SZEDATA2_ASdefault value: 0
This option defines type of firmware address space. Currently supported value is:
0 for firmwares:
23.3. Using the SZEDATA2 PMD
From DPDK version 16.04 the type of SZEDATA2 PMD is changed to PMD_PDEV. SZEDATA2 device is automatically recognized during EAL initialization. No special command line options are needed.
Kernel modules have to be loaded before running the DPDK application.
23.4. Example of usage
Read packets from 0. and 1. receive channel and write them to 0. and 1. transmit channel:
$RTE_TARGET/app/testpmd -l 0-3 -n 2 \ -- --port-topology=chained --rxq=2 --txq=2 --nb-cores=2 -i -a
[...] EAL: PCI device 0000:06:00.0 on NUMA socket -1 EAL: probe driver: 1b26:c1c1 rte_szedata2_pmd PMD: Initializing szedata2 device (0000:06:00.0) PMD: SZEDATA2 path: /dev/szedataII0 PMD: Available DMA channels RX: 8 TX: 8 PMD: resource0 phys_addr = 0xe8000000 len = 134217728 virt addr = 7f48f8000000 PMD: szedata2 device (0000:06:00.0) successfully initialized Interactive-mode selected Auto-start selected Configuring Port 0 (socket 0) Port 0: 00:11:17:00:00:00 Checking link statuses... Port 0 Link Up - speed 10000 Mbps - full-duplex Done Start automatic packet forwarding io packet forwarding - CRC stripping disabled - packets/burst=32 nb forwarding cores=2 - nb forwarding ports=1 RX queues=2 - RX desc=128 - RX free threshold=0 RX threshold registers: pthresh=0 hthresh=0 wthresh=0 TX queues=2 - TX desc=512 - TX free threshold=0 TX threshold registers: pthresh=0 hthresh=0 wthresh=0 TX RS bit threshold=0 - TXQ flags=0x0 testpmd>