[dpdk-users] using the basic l2fwd app

Kushal Gautam kushal.gautam at gmail.com
Thu Oct 18 23:17:32 CEST 2018


Hi Rami:

thank you for your inputs.

Indeed, I had syntactic issues, and also, restarting the machine did the
trick.

One thing that I was not clear is about "portmask".

For instance, in the docs, we can find "./l2fwd -n 1 -c f -- -q 8 -p 0x3".
What exactly the value "0x3" refers to?

Regards,
Kushal.

On Thu, Oct 18, 2018 at 7:34 PM Rami Rosen <roszenrami at gmail.com> wrote:

> Hi Kushal,
> The output of dpdk-devbind -- status that you posted shows that there are
> no ports that are bound to dpdk. This is the reason for the error you get.
> You should try
> insmod igb_uio.ko
> ( this kernel module is generated in the build process of DPDK)
>
> And
> dpdk-devbind.py -b igb_uio 0000:81:00.0
>
> And likewise to the other port, 0000:81:00.1
> And the launch the l2fwd app.
>
>
> You can also use vfio-pci or uio_pci_generic for binding the device to
> DPDK, look in the docs.
>
> Regards,
> Rami Rosen
>
>
>
> בתאריך יום ה׳, 18 באוק׳ 2018, 17:24, מאת Kushal Gautam ‏<
> kushal.gautam at gmail.com>:
>
>> 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.
>>
>


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