[dpdk-dev] DPDK/ipv4_mcast sample application doesn't work

[dpdk-dev] DPDK/ipv4_mcast sample application doesn't work

[KESHAVARAO, RASHMI]

Hi,
We are trying to use the ipv4_multicast app in DPDK examples.
However, we are not able to get it to run as expected.

The behavior that we are seeing is that packets are being sent from a packet generator but they are not being received by the APP. We have tried debugging the app by putting prints at various places but still don't have a clue on what is wrong.

We tried other examples apps like testpmd, l2fwd etc and these are working flawlessly.

Need inputs from the DPDK experts on the ipv4_multicast app.

Command used:


./<build_dir>/examples/ipv4_multicast -c 0x1 -n 1 -- -p 0x5 -q 2

DPDK Version: 20.08
NIC: XXV710 (fw version: 8.3)
Bound to: vfio-pci UIO


With the above command:

*       rte_eth_rx_burst() returns 0 in the ipv4_multicast app even when packets are being sent to the NIC/port.



Regards,
Rashmi.

Re: [dpdk-dev] DPDK/ipv4_mcast sample application doesn't work

[Ferruh Yigit]

On 9/6/2021 8:34 AM, KESHAVARAO, RASHMI wrote:
> Hi,
> We are trying to use the ipv4_multicast app in DPDK examples.
> However, we are not able to get it to run as expected.
> 
> The behavior that we are seeing is that packets are being sent from a packet generator but they are not being received by the APP. We have tried debugging the app by putting prints at various places but still don't have a clue on what is wrong.
> 
> We tried other examples apps like testpmd, l2fwd etc and these are working flawlessly.
> 
> Need inputs from the DPDK experts on the ipv4_multicast app.
> 
> Command used:
> 
> 
> ./<build_dir>/examples/ipv4_multicast -c 0x1 -n 1 -- -p 0x5 -q 2
> 
> DPDK Version: 20.08
> NIC: XXV710 (fw version: 8.3)
> Bound to: vfio-pci UIO
> 
> 
> With the above command:
> 
> *       rte_eth_rx_burst() returns 0 in the ipv4_multicast app even when packets are being sent to the NIC/port.
> 
> 
> 
> Regards,
> Rashmi.
> 

Hi Rashmi,

Most probably because packets destination MAC address is not matching to NIC MAC
address.

Can you please either test with adding 'rte_eth_promiscuous_enable(portid);'
(you can add after 'rte_eth_allmulticast_enable(portid);'),
or by setting correct destination MAC for packets?

Regards,
ferruh