Questions about the the pdump functionality

[Pavel Vazharov <freakpv@gmail.com>]

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Hi there,

We've a DPDK based application from which we need to take packet dumps from
time to time when problems arise. We are planning to use librte_pdump
functions and the dpdk-dumppcap tool.
I've few questions in related to the pdump functionality which we want to
use:
- Is calling `rte_pdump_init` at the startup of the main application
causing some overhead for the packet processing during its run if there is
no actual packet capturing enabled by the dpdk-dumppcap tool? I suppose
there should be some check in place but is it something like a single `if`
condition on a boolean flag or something heavier?
- Is it possible then to call `rte_pdump_init` during the runtime of the
main application only when I know that I'm about to start the dpdk-dumppcap
tool? I mean, is it supported and safe to call `rte_pdump_init` and
`rte_pdump_uninit` while the main application is running and processing
packets or these functions are supposed to be called only at application
startup and application stop.

Thanks in advance,
Pavel.

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