[dpdk-users] using the basic l2fwd app

Kushal Gautam kushal.gautam at gmail.com
Fri Oct 19 08:54:24 CEST 2018


Hi Rami,

Thank you again. That's what confused me.

Regards,
Kushal.

On Fri, Oct 19, 2018, 01:36 Rami Rosen <roszenrami at gmail.com> wrote:

> Hi Kushal,
> 0x3 is a bitmask of ports. It is represented in binary as 0011. This means
> that ports 0 and port 1should be used by the DPDK application that you use.
> If you want to use other ports in your application, you should use a
> different portmask. For example, to use port 0 and port 3, you need a port
> mask of 1001 in binary, which is 0x9 in hex.
>
> Regards,
> Rami Rosen
>
>
> בתאריך יום ו׳, 19 באוק׳ 2018, 00:17, מאת Kushal Gautam ‏<
> kushal.gautam at gmail.com>:
>
>> 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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