CODEWITHSUNDEEP
linuxtcpdump
Yogesh
Yogesh

Reputation: 49

Packet capturing in l3fwd

I am performing a dpdk experiment. In my setup, I have two physical machines, Host1 and Host2 with 2 10Gbps NICs on each. One interface of Host1 is bounded with dpdk and generating traffic using pktgen. Both interfaces of Host2 are bounded with dpdk and l3fwd is running as packet forwarding application. Second NIC of Host2 is used to capture the packets. I want to breakdown the delay experienced by a packet by seeing the time spent in each interface of Host2.

Is there any way to capture packets of dpdk interfaces using l3fwd as packet forwarding applications?

Upvotes: 0

Views: 456

Answers (2)

Vipin Varghese
Vipin Varghese

Reputation: 4798

For DPDK interfaces you can make use DPDK-PDUMP capture to get packets from DPDK bonded nic. Refer https://doc.dpdk.org/guides-16.07/sample_app_ug/pdump.html.

Application l3fwd is to be modified with rte_pdump_init API call right after rte_eal_init. This will enable multi-proecss communication channel, there by when dpdk-pdump (secondary) application is run rte_ring and packet copy is enabled to copy the content over.

Note: please check DPDK PDUmp App on usage. FOr example to copy packets from port 0 and queue 1 use sudo ./[path to applciation]/dpdk-pdump -- --pdump 'port=0,queue=1,rx-dev=/tmp/port0_queue1.pcap'

Upvotes: 1

Muhammad Bilal
Muhammad Bilal

Reputation: 11

pdump is good tool to capture packets at any port binded to dpdk. Launch the pdump tool as follows:

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

and after packets are received, run the following command in home/temp directory to view them

tcpdump -nr ./capture.pcap

Upvotes: 0

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