[dpdk-dev] unable to receive packets less than 4 with rte_eth_rx_burst Api -regarding.

Perugu Hemasai Chandra Prasad hemasaiperugu at 5g.iith.ac.in
Tue Sep 3 11:23:31 CEST 2019


Hi,
I tried changing "RTE_I40E_DESCS_PER_LOOP" located in i40e_rxtx.h to 1 and
recompiling DPDK but it didn't work. Is there any procedure to make it work
for rx_burst of 1 packet?

On Tue, 3 Sep, 2019, 12:32 Wang, Haiyue, <haiyue.wang at intel.com> wrote:

> Some PMD Vector Rx for performance has an hidden limitation like :
>
>         /* nb_pkts shall be less equal than RTE_I40E_MAX_RX_BURST */
>         nb_pkts = RTE_MIN(nb_pkts, RTE_I40E_MAX_RX_BURST);
>
>         /* nb_pkts has to be floor-aligned to RTE_I40E_DESCS_PER_LOOP */
>         nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_I40E_DESCS_PER_LOOP);
> <------ ;-)
>
> #define RTE_I40E_DESCS_PER_LOOP    4
>
> BR,
> Haiyue
>
> > -----Original Message-----
> > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Perugu Hemasai
> Chandra Prasad
> > Sent: Tuesday, September 3, 2019 13:00
> > To: users at dpdk.org; dev at dpdk.org
> > Subject: [dpdk-dev] unable to receive packets less than 4 with
> rte_eth_rx_burst Api -regarding.
> >
> > Hi All,
> >          I am trying to receive packets transmitted by another DPDK
> > application running on different system. I am able to transmit packets
> with
> > a burst value of 1 using rte_eth_tx_burst Api, but unable to receive
> > packets with a burst value less than 4 using rte_eth_rx_burst Api. can
> > anyone please tell me the reason behind that? Is that because of any
> EthDev
> > configuration?. How to receive packets with a burst value of 1?
> >
> > Thanks & Regards,
> > Hemasai
>


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