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.

More information about the NFB cards and used technology (Netcope Development Kit) can be found on the Netcope Technologies website.

Note

This driver has external dependencies. Therefore it is disabled in default configuration files. It can be enabled by setting CONFIG_RTE_LIBRTE_PMD_SZEDATA2=y and recompiling.

Note

Currently the driver is supported only on x86_64 architectures. Only x86_64 versions of the external libraries are provided.

23.1. Prerequisites

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:

  • libsze2 library

    The library provides API for initialization of sze2 transfers, receiving and transmitting data segments.

  • Kernel modules

    • combov3
    • szedata2_cv3

    Kernel modules manage initialization of hardware, allocation and sharing of resources for user space applications.

Information about getting the dependencies can be found here.

23.2. Configuration

These configuration options can be modified before compilation in the .config file:

  • CONFIG_RTE_LIBRTE_PMD_SZEDATA2 default value: n

    Value y enables compilation of szedata2 PMD.

  • CONFIG_RTE_LIBRTE_PMD_SZEDATA2_AS default value: 0

    This option defines type of firmware address space and must be set according to the used card and mode. Currently supported values are:

    • 0 - for cards (modes):

      • NFB-100G1 (100G1)
    • 1 - for cards (modes):

      • NFB-100G2Q (100G1)
    • 2 - for cards (modes):

      • NFB-40G2 (40G2)
      • NFB-100G2C (100G2)
      • NFB-100G2Q (40G2)
    • 3 - for cards (modes):

      • NFB-40G2 (10G8)
      • NFB-100G2Q (10G8)
    • 4 - for cards (modes):

      • NFB-100G1 (10G10)
    • 5 - for experimental firmwares and future use

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

Example output:

[...]
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>