[dpdk-users] [dpdk-dev] how to Read(Write) from(to) via lcores in dpdk regardless of NIC

[Andriy Berestovskyy]

Mahdi,
1. Sure, the rte_ring is another good way to communicate between the
lcores. If you have just one "worker" lcore or you do not care about
packet ordering, you might prefer using rte_ring over the
rte_distributor.


2. For the simplicity, you might assume that any of your shared
structures (rte_ring or rte_distributor) eventually get into the
cache.

Andriy

On Tue, Mar 8, 2016 at 10:49 PM, Mahdi Moradmand Badie
<mahdi.mbadie at gmail.com> wrote:
> Another issue, ;)
> How I could access to the share memory cache of lcores (L3), the rte_ring
> is exactly that??
>
> On 8 March 2016 at 13:08, Mahdi Moradmand Badie <mahdi.mbadie at gmail.com>
> wrote:
>
>> Dear Andriy,
>> Sorry for interrupt again,
>> As I see in rte_distributor, it is using rte_eth (ethernet), while I
>> wanna without using any NIC because I don't have it on my personal computer
>> :)
>>
>> On 8 March 2016 at 11:49, Mahdi Moradmand Badie <mahdi.mbadie at gmail.com>
>> wrote:
>>
>>> Thanks so much Andriy,
>>> Regarding cross-post, yes you are right sorry about that and of course
>>> afterwards.
>>>
>>> On 8 March 2016 at 03:17, Andriy Berestovskyy <aber at semihalf.com> wrote:
>>>
>>>> Hi Mahdi,
>>>> Looks like the DPDK's rte_distributor is the right tool for your task.
>>>> Please have a look at:
>>>> http://dpdk.org/doc/guides/prog_guide/packet_distrib_lib.html
>>>>
>>>> There is also the Distributor Sample Application in DPDK:
>>>> http://dpdk.org/doc/guides/sample_app_ug/dist_app.html
>>>>
>>>>
>>>> Please do not cross-post to dev@ mailing list.
>>>>
>>>> Regards,
>>>> Andriy
>>>>
>>>> On Tue, Mar 8, 2016 at 6:41 AM, Mahdi Moradmand Badie
>>>> <mahdi.mbadie at gmail.com> wrote:
>>>> > I wanna create for example 3 different packets in core_0 as master and
>>>> > store them one by one in share memory(rte_ring),
>>>> > then the core_1 as slave read them and do function on them (ex.
>>>> P1+P2+P3)
>>>> > and again store in share memory, finally the core_0 read the packets
>>>> from
>>>> > share memory and compare them with whatever expected :)
>>>> > As I said and you mentioned is the same? :)
>>>> >
>>>> > On 8 March 2016 at 00:35, Hamed Zaghaghi <hamed.zaghaghi at gmail.com>
>>>> wrote:
>>>> >
>>>> >> Hi,
>>>> >>
>>>> >> If I understood well you need to do these tasks:
>>>> >> 1. Packet crafting (I think that DPDK has no functions for this task)
>>>> >> 2. Store packets (DPDK has (rte_mbuf)[
>>>> >> http://dpdk.org/doc/api/rte__mbuf_8h.html])
>>>> >> 3. Share between lcores (DPDK offers rte_ring)
>>>> >>
>>>> >>
>>>> >>
>>>> >> On Tue, Mar 8, 2016 at 8:45 AM Mahdi Moradmand Badie <
>>>> >> mahdi.mbadie at gmail.com> wrote:
>>>> >>
>>>> >>> Dear Hamed,
>>>> >>>
>>>> >>> First of all thank you so much for your kindly reply,
>>>> >>>
>>>> >>> It's the primary part of the big project, in order to be more
>>>> familiar
>>>> >>> with DPDK,
>>>> >>> I have to implement the mentioned framework by use of DPDK,
>>>> >>> And finally we wanna implement the cache locking approach (via help
>>>> of
>>>> >>> features like Cache Allocation Technology(CAT), Cache Monitoring
>>>> Technology
>>>> >>> (CMT)) in Xeon processor (my supervisor told me this simple exercise
>>>> >>> will be helpful to do the final part) in such a way we could
>>>> dedicate a
>>>> >>> specific part of shared memory (L3) to each core which the other
>>>> don't
>>>> >>> access to it.
>>>> >>> Obviously using of DPDK with Xeon which both are from "Intel", is
>>>> >>> considered as strength point.
>>>> >>>
>>>> >>> I hope this was more clear :)
>>>> >>>
>>>> >>> On 7 March 2016 at 23:56, Hamed Zaghaghi <hamed.zaghaghi at gmail.com>
>>>> >>> wrote:
>>>> >>>
>>>> >>>> Hi Mahdi,
>>>> >>>>
>>>> >>>> Why do you want to use DPDK when you don't use NIC? You can do what
>>>> you
>>>> >>>> want outside of DPDK.
>>>> >>>>
>>>> >>>> Regards,
>>>> >>>> Hamed Zaghaghi
>>>> >>>>
>>>> >>>> On Tue, Mar 8, 2016 at 12:16 AM Mahdi Moradmand Badie <
>>>> >>>> mahdi.mbadie at gmail.com> wrote:
>>>> >>>>
>>>> >>>>> Dear All,
>>>> >>>>> I am Mahdi and I am new in DPDK,
>>>> >>>>> I wanna generate for example 3 different packets in core0 as master
>>>> >>>>> write
>>>> >>>>> it to share memory (L3), then core1 as slave read this packets,
>>>> change
>>>> >>>>> them
>>>> >>>>> with for example function1 and write again in share memory (L3) and
>>>> >>>>> finally
>>>> >>>>> check the result with whatever I expect.
>>>> >>>>> The most important thing is that I don't wanna use NIC and I don't
>>>> know
>>>> >>>>> for
>>>> >>>>> working with cores how I can write/read to/from them, I mean with
>>>> which
>>>> >>>>> template and sequence???
>>>> >>>>> Thanks in advance,
>>>> >>>>>
>>>> >>>>
>>>> >>>
>>>> >>>
>>>> >>> --
>>>> >>> M at hdi Mor at dm@nd B at die
>>>> >>>
>>>> >>
>>>> >
>>>> >
>>>> > --
>>>> > M at hdi Mor at dm@nd B at die
>>>>
>>>>
>>>>
>>>> --
>>>> Andriy Berestovskyy
>>>>
>>>
>>>
>>>
>>> --
>>> M at hdi Mor at dm@nd B at die
>>>
>>
>>
>>
>> --
>> M at hdi Mor at dm@nd B at die
>>
>
>
>
> --
> M at hdi Mor at dm@nd B at die



-- 
Andriy Berestovskyy