Re: [dpdk-users] Send and Receive packets to/from specific core

[Kyle Larose <eomereadig@gmail.com>]

On Fri, Mar 11, 2016 at 3:47 PM, Mahdi Moradmand Badie
<mahdi.mbadie@gmail.com> wrote:
> My big challenge is having a tested code (run able with right
> functionality), then run and change it in order to have my task.
> I wanna use the share memory btw cores in order to write/read to/from and
> knowing how do that :), all available code which I found are based on NIC :(
> or maybe I am wrong!!!
> Thanks in advance,

Take a look at this example:

http://dpdk.org/doc/guides/sample_app_ug/multi_process.html#basic-multi-process-example

IIRC, it uses rings to send messages back and forth between the cores.
The code is available with the dpdk source, so it should serve as a
good starting point to see how to set up the shared memory and use it.

Does that help?

>
> On 11 March 2016 at 15:43, Kyle Larose <eomereadig@gmail.com> wrote:
>>
>> On Fri, Mar 11, 2016 at 3:22 PM, Mahdi Moradmand Badie
>> <mahdi.mbadie@gmail.com> wrote:
>> > Dear All,
>> >
>> > I wanna Send(write) a Packet(s) with specific data (for example x = 10)
>> > from core 0 to share memory and Receive (Read) it with another Core (for
>> > example Core 1), change it in Core 1 (for example X = X + 1) and write
>> > again in share memory.
>> > I really don't know How I could do it, I wanna do this without using NIC
>> > ot
>> > rte_eth at all, so simple and easy but I confused.
>> > Please help me.
>> >
>> > PS. I know there are many example do more complex than this small
>> > exercise
>> > but all did it via NIC.
>>
>> What is your biggest challenge? Is it moving information between
>> cores, or getting information into your application?
>>
>> Consider that most of the multiprocess examples in DPDK do two things:
>> 1) Send/Receive packets to/from a NIC
>> 2) Send packets between cores
>>
>> You obviously want to do #2, and looking at those examples should make
>> how to do it fairly obvious. Is your challenge replacing #1 with
>> something other than a NIC? If so, you *could* consider using a pcap
>> PMD to just read packets from a file. In the past, I have used ring
>> PMDs in conjunction with a secondary process which generates packets
>> to inject arbitrarily formatted packets into my program.
>>
>> >
>> > --
>> > M@hdi Mor@dm@nd B@die
>
>
>
>
> --
> M@hdi Mor@dm@nd B@die