Created attachment 262 [details]
testpmd output for the two commits

Commit 6026bfa breaks dumpcap on CX6 DX, the previous commit. 742be6a, didn't
show this issue. 
The error with this commit is: 
> ~/dpdk/build-6026bfa$ sudo ./app/dpdk-testpmd -c 0xf0 -n 4 -a 0000:03:00.0 --
> -i --port-topology=chained
...
> testpmd> start
> Packet forwarding already started
> testpmd> pdump_register_rx_callbacks(): rx callback for port=0 queue=0,
> already exists

and: 

>~/dpdk/build-6026bfa$ sudo ./app/dpdk-dumpcap -i 0  -c 6 -i 0 -w
>/tmp/sample.pcapng
File: /tmp/sample.pcapng
>pdump_prepare_client_request(): client request for pdump enable/disable failed
>EAL: Error - exiting with code: 1
>  Cause: Packet dump enable on 0:0000:03:00.0 failed Operation not permitted