[dpdk-dev] [Bug 802] Need help with ipv4_multicast app in DPDK 20.08

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=802

            Bug ID: 802
           Summary: Need help with ipv4_multicast app in DPDK 20.08
           Product: DPDK
           Version: 20.08
          Hardware: x86
                OS: All
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: examples
          Assignee: dev at dpdk.org
          Reporter: rashmi.keshavarao at hpe.com
  Target Milestone: ---

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.

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