[dpdk-dev] query about port queues

[Jyotiswarup Raiturkar]

Thanks Prashant

-Jyoti


On Wed, Oct 23, 2013 at 7:52 PM, Prashant Upadhyaya <
prashant.upadhyaya at 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 at dpdk.org] On Behalf Of Jyotiswarup Raiturkar
> Sent: Wednesday, October 23, 2013 5:10 PM
> To: dev at 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
>
>
>
>
>
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