[DPDK/core Bug 2075] pdump fails on hairpin queue

[bugzilla@dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=2075

            Bug ID: 2075
           Summary: pdump fails on hairpin queue
           Product: DPDK
           Version: 26.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: dev@dpdk.org
          Reporter: stephen@networkplumber.org
  Target Milestone: ---

Message from Haan on Slack reported issue with dpdk-dumpcap with hairpin queue

Hello all,

I found a problem with dpdk-dumpcap that makes it fail to capture, it happens
if a DPDK program has a port that has a haripin queue, the first run fails with
Unknown error -22 , every later run on the same port fails with File exists.

Steps to reproduce:

1. Start testpmd with one hairpin queue per port:

   dpdk-testpmd -l 0-1 -a <PCI_ADDR> -- -i --rxq=1 --txq=1 --hairpinq=1
   testpmd> start

2. In another shell, run dumpcap:

   dpdk-dumpcap -i 0 -w /tmp/zzz.pcap

Result:

File: zzz.pcap
PDUMP: pdump_prepare_client_request(): client request for pdump enable/disable
failed
EAL: Error - exiting with code: 1
Packet dump enable on 0:0000:01:00.0 failed Unknown error -22

3. Run the same dumpcap command again:

Result:

File: zzz.pcap
PDUMP: pdump_prepare_client_request(): client request for pdump enable/disable
failed
EAL: Error - exiting with code: 1
Packet dump enable on 0:0000:01:00.0 failed File exists

Any idea how can I use it to capture even if there's a haripin queue?

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