[dpdk-dev] Fwd: port-queue-process

[dpdk-dev] Fwd: port-queue-process

[Nishant Verma]

Hi All,

I have one doubt about dpdk.

Question. Suppose on 8 core machine DPDK process is running on all cores,
all process has its own Rx & Tx queue. My question is, let we have a packet
from some network for DPDK application running on 2nd core, how it will
reach to 2nd core and not to some other core.

Any clue and reference will be appreciated. It might seems to little doubt
but as i don't know, its big for me.

​thanks. ​

-- 
Rgds,
​
NV​

Re: [dpdk-dev] Fwd: port-queue-process

[De Lara Guarch, Pablo]

Hi Nishant,

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Nishant Verma
> Sent: Saturday, November 28, 2015 5:42 AM
> To: dev@dpdk.org
> Subject: [dpdk-dev] Fwd: port-queue-process
> 
> Hi All,
> 
> I have one doubt about dpdk.
> 
> Question. Suppose on 8 core machine DPDK process is running on all cores,
> all process has its own Rx & Tx queue. My question is, let we have a packet
> from some network for DPDK application running on 2nd core, how it will
> reach to 2nd core and not to some other core.
> 
> Any clue and reference will be appreciated. It might seems to little doubt
> but as i don't know, its big for me.

I think what you are looking for is packet filtering and queue assignment,
specifically, Flow Director. I assume you have one port and several queues in that port:
you will need assign each queue to a different core, and program the device in a way that
packets with a particular source MAC address or IP address will go to a specified queue,
so the desired core can poll the packets from that queue.

Let me know if you have any more questions,

Pablo

> 
> ​thanks. 
> 
> --
> Rgds,
> ​
> NV​

Re: [dpdk-dev] Fwd: port-queue-process

[Nishant Verma]

Thanks for the reply.

Got your point. It means, suppose DPDK app is getting packet from 10
different source. On very first packet from any source, we first check
source MAC address and then search what queue we have used last time, and
placed in the same else choose the queue based on some factors.?

One more thing, suppose if DPDK app is getting packet from one single
source and that source is handling 10 different source? In that case how we
make diffenence?

Thanks.

On Sat, Nov 28, 2015 at 2:12 PM, De Lara Guarch, Pablo <
pablo.de.lara.guarch@intel.com> wrote:

> Hi Nishant,
>
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Nishant Verma
> > Sent: Saturday, November 28, 2015 5:42 AM
> > To: dev@dpdk.org
> > Subject: [dpdk-dev] Fwd: port-queue-process
> >
> > Hi All,
> >
> > I have one doubt about dpdk.
> >
> > Question. Suppose on 8 core machine DPDK process is running on all cores,
> > all process has its own Rx & Tx queue. My question is, let we have a
> packet
> > from some network for DPDK application running on 2nd core, how it will
> > reach to 2nd core and not to some other core.
> >
> > Any clue and reference will be appreciated. It might seems to little
> doubt
> > but as i don't know, its big for me.
>
> I think what you are looking for is packet filtering and queue assignment,
> specifically, Flow Director. I assume you have one port and several queues
> in that port:
> you will need assign each queue to a different core, and program the
> device in a way that
> packets with a particular source MAC address or IP address will go to a
> specified queue,
> so the desired core can poll the packets from that queue.
>
> Let me know if you have any more questions,
>
> Pablo
>
> >
> > ​thanks.
> >
> > --
> > Rgds,
> > ​
> > NV​
>



-- 
Rgds,
​NV

Re: [dpdk-dev] Fwd: port-queue-process

[De Lara Guarch, Pablo]

Hi,



> From: Nishant Verma [mailto:vnish11@gmail.com]

> Sent: Saturday, November 28, 2015 7:28 PM

> To: De Lara Guarch, Pablo

> Cc: dev@dpdk.org<mailto:dev@dpdk.org>

> Subject: Re: [dpdk-dev] Fwd: port-queue-process

>

> Thanks for the reply.

> Got your point. It means, suppose DPDK app is getting packet from 10

> different source. On very first packet from any source, we first check source

> MAC address and then search what queue we have used last time, and

> placed in the same else choose the queue based on some factors.?



What do you mean with sources? Are you getting all packets in the same port, right?

If so, you can identify the sources by the differences between packets, such as the L2, L3… headers.

It looks like you want to add rules dynamically, so at first you don’t know what your sources are,

but as you get packets from different sources, you can assign them to different cores.

In that case, yes, you could see what queues you used so far, and assign it to a queue that is not being used,

but that depends on what the core is going to do with that flow (from a source).

I mean, if you are going to run the same code for all packets, but in different cores,

then probably something like RSS can work for you, but if the code is going to be different

depending on the source, then you need to know in advance these sources

and program flow director accordingly.



> One more thing, suppose if DPDK app is getting packet from one single

> source and that source is handling 10 different source? In that case how we

> make diffenence?



In this case, I guess your worry is that you would have same L2 header for all sources?

As long as you can identify your source in any field of the packet (probably L3 header),

it doesn’t matter if you are in the first scenario or this one.



Pablo



> Thanks.

>

> On Sat, Nov 28, 2015 at 2:12 PM, De Lara Guarch, Pablo

> <pablo.de.lara.guarch@intel.com<mailto:pablo.de.lara.guarch@intel.com>> wrote:

> Hi Nishant,

>

> > -----Original Message-----

> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Nishant Verma

> > Sent: Saturday, November 28, 2015 5:42 AM

> > To: dev@dpdk.org<mailto:dev@dpdk.org>

> > Subject: [dpdk-dev] Fwd: port-queue-process

> >

> > Hi All,

> >

> > I have one doubt about dpdk.

> >

> > Question. Suppose on 8 core machine DPDK process is running on all

> cores,

> > all process has its own Rx & Tx queue. My question is, let we have a

> packet

> > from some network for DPDK application running on 2nd core, how it will

> > reach to 2nd core and not to some other core.

> >

> > Any clue and reference will be appreciated. It might seems to little doubt

> > but as i don't know, its big for me.

>

> I think what you are looking for is packet filtering and queue assignment,

> specifically, Flow Director. I assume you have one port and several queues

> in that port:

> you will need assign each queue to a different core, and program the device

> in a way that

> packets with a particular source MAC address or IP address will go to a

> specified queue,

> so the desired core can poll the packets from that queue.

>

> Let me know if you have any more questions,

>

> Pablo

>

> >

> > ​thanks.

> >

> > --

> > Rgds,

> >

> > NV​

>

>

>

> --

> Rgds,

> ​NV