* [dpdk-dev] query about port queues
@ 2013-10-23 11:40 Jyotiswarup Raiturkar
2013-10-23 14:22 ` Prashant Upadhyaya
0 siblings, 1 reply; 3+ messages in thread
From: Jyotiswarup Raiturkar @ 2013-10-23 11:40 UTC (permalink / raw)
To: dev
Hello Devs
I'm new to DPDK and trying to understand the basics. I went through the
programming guide but I had one question regarding Tx and Rx queues per
port. Are they configurable entirely in software or do they depend on the
HW (NIC)? Does the L2 configuration (MAC address) apply to all the queues
on the port? (and hence will an application like say a network stack need
packets from all the queues in the port)?
Thanks
Jyotiswarup Raiturkar
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [dpdk-dev] query about port queues
2013-10-23 11:40 [dpdk-dev] query about port queues Jyotiswarup Raiturkar
@ 2013-10-23 14:22 ` Prashant Upadhyaya
2013-10-24 4:39 ` Jyotiswarup Raiturkar
0 siblings, 1 reply; 3+ messages in thread
From: Prashant Upadhyaya @ 2013-10-23 14:22 UTC (permalink / raw)
To: Jyotiswarup Raiturkar, dev
Hi Jyoti,
You can configure the number of tx and rx queues via the software when you are calling the rte_eth_dev_configure.
However you cannot allocate more than what the NIC supports. But you can allocate less ofcourse.
Typically the queues are used so that independent cores can do tx and rx on a separate queue without locking.
If you have configured 'n' rx queues, your must ensure that you read from _all_ the queues because the packet can arrive on any of the rx queues based on the algorithm by which NIC fans out incoming messages on the queues (eg. RSS). You can transmit freely from any queue (eg. each core of yours could have a tx queue each in your usecase)
Regards
-Prashant
-----Original Message-----
From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Jyotiswarup Raiturkar
Sent: Wednesday, October 23, 2013 5:10 PM
To: dev@dpdk.org
Subject: [dpdk-dev] query about port queues
Hello Devs
I'm new to DPDK and trying to understand the basics. I went through the programming guide but I had one question regarding Tx and Rx queues per port. Are they configurable entirely in software or do they depend on the HW (NIC)? Does the L2 configuration (MAC address) apply to all the queues on the port? (and hence will an application like say a network stack need packets from all the queues in the port)?
Thanks
Jyotiswarup Raiturkar
===============================================================================
Please refer to http://www.aricent.com/legal/email_disclaimer.html
for important disclosures regarding this electronic communication.
===============================================================================
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [dpdk-dev] query about port queues
2013-10-23 14:22 ` Prashant Upadhyaya
@ 2013-10-24 4:39 ` Jyotiswarup Raiturkar
0 siblings, 0 replies; 3+ messages in thread
From: Jyotiswarup Raiturkar @ 2013-10-24 4:39 UTC (permalink / raw)
To: Prashant Upadhyaya; +Cc: dev
Thanks Prashant
-Jyoti
On Wed, Oct 23, 2013 at 7:52 PM, Prashant Upadhyaya <
prashant.upadhyaya@aricent.com> wrote:
> Hi Jyoti,
>
> You can configure the number of tx and rx queues via the software when you
> are calling the rte_eth_dev_configure.
> However you cannot allocate more than what the NIC supports. But you can
> allocate less ofcourse.
>
> Typically the queues are used so that independent cores can do tx and rx
> on a separate queue without locking.
>
> If you have configured 'n' rx queues, your must ensure that you read from
> _all_ the queues because the packet can arrive on any of the rx queues
> based on the algorithm by which NIC fans out incoming messages on the
> queues (eg. RSS). You can transmit freely from any queue (eg. each core of
> yours could have a tx queue each in your usecase)
>
> Regards
> -Prashant
>
>
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Jyotiswarup Raiturkar
> Sent: Wednesday, October 23, 2013 5:10 PM
> To: dev@dpdk.org
> Subject: [dpdk-dev] query about port queues
>
> Hello Devs
> I'm new to DPDK and trying to understand the basics. I went through the
> programming guide but I had one question regarding Tx and Rx queues per
> port. Are they configurable entirely in software or do they depend on the
> HW (NIC)? Does the L2 configuration (MAC address) apply to all the queues
> on the port? (and hence will an application like say a network stack need
> packets from all the queues in the port)?
> Thanks
> Jyotiswarup Raiturkar
>
>
>
>
>
> ===============================================================================
> Please refer to http://www.aricent.com/legal/email_disclaimer.html
> for important disclosures regarding this electronic communication.
>
> ===============================================================================
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2013-10-24 4:38 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-10-23 11:40 [dpdk-dev] query about port queues Jyotiswarup Raiturkar
2013-10-23 14:22 ` Prashant Upadhyaya
2013-10-24 4:39 ` Jyotiswarup Raiturkar
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).