Re: [iovisor-dev] Can we attach an IOmodule to a pcap file?

2017-03-20 Thread Alexei Starovoitov via iovisor-dev 
On Mon, Mar 20, 2017 at 10:08:57AM +0100, Fulvio Risso via iovisor-dev wrote:
> Dear all,
> 
> perhaps a naive question.
> 
> Instead of attaching an Iomodule to a NIC and perform statistics/whatever,
> can we attach the Iomodule to a pcap file?
> 
> The classical BPF (with libpcap) has this feature, which enables to run
> multiple tests on the same data and see what happens (e.g., to compare the
> performance of different programs).
> We're unable to find a similar feature when playing with eBPF and more
> complex programs that go beyond packet filtering.

that's a great idea. To simulate something like this it's possible
to attach cls_bpf to veth or tap device and tcpreplay pcap into it.
For xdp that would need some kernel work, since spinning a VM with virtio
and sending pcap into tap is too cumbersome.

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[iovisor-dev] Can we attach an IOmodule to a pcap file?

2017-03-20 Thread Fulvio Risso via iovisor-dev 

Dear all,

perhaps a naive question.

Instead of attaching an Iomodule to a NIC and perform 
statistics/whatever, can we attach the Iomodule to a pcap file?


The classical BPF (with libpcap) has this feature, which enables to run 
multiple tests on the same data and see what happens (e.g., to compare 
the performance of different programs).
We're unable to find a similar feature when playing with eBPF and more 
complex programs that go beyond packet filtering.


Thanks in advance for any suggestion,

fulvio
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