[DPDK/other Bug 1608] dpdk-dumpcap not allowed to do multiple invocations on the same interface

[DPDK/other Bug 1608] dpdk-dumpcap not allowed to do multiple invocations on the same interface

[bugzilla]

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https://bugs.dpdk.org/show_bug.cgi?id=1608

            Bug ID: 1608
           Summary: dpdk-dumpcap  not allowed to do multiple invocations
                    on the same interface
           Product: DPDK
           Version: 23.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: other
          Assignee: dev@dpdk.org
          Reporter: junwang01@cestc.cn
  Target Milestone: ---

In practical use, many scenarios may require distinguishing between inbound and
outbound traffic based on matching rules, which would necessitate calling
dpdk-dumpcap twice on the same interface. However, it seems that this is not
supported at the moment. Additionally, even when using the --file-prefix
option, the same limitation applies.


The first invocation：
[root@xgw-dpdk /]# /dpdk/app/dpdk-dumpcap -i 0000:21:00.0 
File: /tmp/dpdk-dumpcap_0_0000:21:00.0_20241227024137.pcapng
Capturing on '0000:21:00.0'
Packets captured: 108 ^C

The second invocation：
[root@xgw-dpdk /]# /dpdk/app/dpdk-dumpcap -i 0000:21:00.0 
File: /tmp/dpdk-dumpcap_0_0000:21:00.0_20241227024149.pcapng
pdump_prepare_client_request(): client request for pdump enable/disable failed
EAL: Error - exiting with code: 1
  Cause: Packet dump enable on 0:0000:21:00.0 failed File exists

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