DPDK pdump libraries and tools pdump

(http://dpdk.org/doc/guides/prog_guide/pdump_lib.html?highlight=librte_pdump)

librte_pdump library service to those who are asked to allow the user initialization packet capture framework to enable or disable packet capture capabilities API. The library is suitable for the client / server model, and is recommended for debug.

"Dpdk-pdump" is based tool librte_pdump library development, operating as DPDK secondary process, and the ability to enable or disable packet capture function on DPDK port. dpdk-pdump tool provides a command-line option, the user can request to enable or disable packet capture function on the port DPDK this option. dpdk-pdump main application tool can only capture the packet with the use of the initialized frame.

Application initialization packet capture framework as a server, enable or disable packet capture application functionality as a client. The Rx and Tx server data packet is sent from the client to DPDK port.

Modified DPDK 'testpmd' packet capture application to initialize the frame, as a server, dpdk-pdump tool as a client. If you want to view testpmd of Rx or Tx packets should first start the application, and then start dpdk-pdump tool. testpmd packet is transmitted to the first pdump tool, and then transmitted from the tool to the pcap pdump PMD apparatus, the apparatus according to the final command line option packet writing pcap file or external interface.

test environment

Figure 1 illustrates the manner dpdk-pdump packet capture tool on DPDK port.

Figure 1: dpdk-pdump tool DPDKPacket capture port

Configuration Steps

The following steps demonstrate how to run the Rx end packet dpdk-pdump tool to capture dpdk_port0 and use tcpdump to monitor.

1. Build DPDK according to the installation file, make sure DPDK meet the following set of configuration options:

CONFIG_RTE_LIBRTE_PMD_PCAP=y

CONFIG_RTE_LIBRTE_PDUMP=y

2. Start testpmd as the main applications:

sudo ./app/testpmd -c 0xf0 -n 4 -- -i --port-topology=chained

3. Start pdump tool according to the following instructions:

sudo ./build/app/dpdk-pdump -- --pdump 'port=0,queue=*,rx-dev=/tmp/capture.pcap'

4. send traffic to flow through the generator dpdk_port0

5. Use the tool can parse pcap file to view the contents capture.pcap, such as tcpdump:

$tcpdump -nr /tmp/capture.pcap

reading from file /tmp/capture.pcap, link-type EN10MB (Ethernet)

11:11:36.891404 IP 4.4.4.4.whois++ > 3.3.3.3.whois++: UDP, length 18

11:11:36.891442 IP 4.4.4.4.whois++ > 3.3.3.3.whois++: UDP, length 18

11:11:36.891445 IP 4.4.4.4.whois++ > 3.3.3.3.whois++: UDP, length 18

in conclusion

In this article, we introduced the DPDK pdump pdump libraries and tools, as well as the flow of how to use them to transport captured on DPDK port.

other information:

For more information on librte_pdump dpdk-pdump libraries and tools, see the following link.

• "DPDK Programmer's Guide" (http://dpdk.org/doc/guides-16.07/prog_guide/pdump_lib.html)There are special sections detail the mode of operation librte_pdump library.

• "Sample Application User Guide (http://dpdk.org/doc/guides16.07/sample_app_ug/pdump.html)There is a special section describes dpdk-pdump applications.

• Use the DPDK pdump feature with open vSwitch*(Https://software.intel.com/en-us/articles/dpdk-pdump-in-open-vswitch-with-dpdk) This article describes the use of dpdk-pdump in OvS-DPDK configuration.

  Any questions, please send an email to [email protected] consultation.

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