[dpdk-users] using the basic l2fwd app

[Kushal Gautam]

Hi:

I am new to DPDK and my current use case with DPDK is minimal. Thus, I
think the l2fwd type of sample application should suffice.

Below is a portion of the output of `dpdk-devbind.py --status` command
My DPDK version is 18.08, and I am using Ubuntu 16.04 (Linux Kernel version
4.15.12)

Network devices using kernel driver
===================================
0000:01:00.0 'I350 Gigabit Network Connection 1521' if=eno1 drv=igb
unused=igb_uio *Active*
0000:01:00.1 'I350 Gigabit Network Connection 1521' if=eno2 drv=igb
unused=igb_uio
0000:81:00.0 'Ethernet Controller X710 for 10GbE SFP+ 1572' if=ens1f0
drv=i40e unused=igb_uio *Active*
0000:81:00.1 'Ethernet Controller X710 for 10GbE SFP+ 1572' if=ens1f1
drv=i40e unused=igb_uio *Active*

I am connecting to this machine via 0000:01:00.0

My requirement is to be able to send packets from 0000:81:00.0 to
0000:81:00.1 and get some measurements like tx and rx times.

I tried to run the sample app as (as shown in docs):

./l2fwd -n 1 -c f -- -q 8 -p 0x3

I have an error like this:

EAL: Detected 16 lcore(s)
EAL: Detected 2 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: No free hugepages reported in hugepages-1048576kB
EAL: No free hugepages reported in hugepages-1048576kB
EAL: No free hugepages reported in hugepages-1048576kB
EAL: Probing VFIO support...
EAL: PCI device 0000:01:00.0 on NUMA socket 0
EAL:   probe driver: 8086:1521 net_e1000_igb
EAL: PCI device 0000:01:00.1 on NUMA socket 0
EAL:   probe driver: 8086:1521 net_e1000_igb
EAL: PCI device 0000:81:00.0 on NUMA socket 1
EAL:   probe driver: 8086:1572 net_i40e
EAL: PCI device 0000:81:00.1 on NUMA socket 1
EAL:   probe driver: 8086:1572 net_i40e
MAC updating enabled
EAL: Error - exiting with code: 1
  Cause: No Ethernet ports - bye

I did not understand the usage of port mask in this context.

Some inputs on this would be very helpful.

Regards,
Kushal.