On Thu, Nov 22, 2018 at 8:18 AM Jerome Tollet (jtollet) <jtol...@cisco.com>
wrote:
> Hi Peter,
>
(It's actually Brian, BTW.)
> Did you try creating a pg interface and spanning packet from your port to
> this interface?
>
I didn't, there wasn't a lot of documentation that would have pointed in
that direction.
But, I will, thanks for the suggestion.
Brian
> Jerome
>
>
>
> *De : *<vpp-dev@lists.fd.io> au nom de "brian.peter.dick...@gmail.com" <
> brian.peter.dick...@gmail.com>
> *Date : *jeudi 22 novembre 2018 à 00:58
> *À : *"vpp-dev@lists.fd.io" <vpp-dev@lists.fd.io>
> *Objet : *[vpp-dev] Request: please add "real" pcap ability #vpp
>
>
>
> Hi, dev folks,
>
> Apologies for my first message being kind of demanding.
>
> However, I think this is a reasonable request.
>
> What I am interested in, and I think this is likely to be a fairly
> universal desire, is the ability to properly integrate some kind of pcap
> packet capture to the full VPP graph.
>
> The current available mechanisms (pcap drop trace and pcap tx trace) do
> not apply to packets that are only "handled" by the host in question, i.e.
> neither originate or terminate on the local host.
>
> In particular, I'm interested in something that can run on a bare metal
> host and, presuming sufficient resources can be given to it (cores, memory,
> etc), do packet capture at line rate.
>
> Thus, any restriction ("run it on a VM") is not adequate.
>
> Given that there is already stuff for handling the pcap file already (in
> vnet/unix IIRC), this should not be a lot of work.
>
> There are two use cases I have:
>
> · debugging data plane stuff on a vpp-based router (i.e. using
> the vppsb netlink and router projects)
>
> · packet capture at line rate (a vpp host that only listens/drops
> traffic, incidental to the packet capture, i.e. a single-purpose host,
> bypassing kernel/driver limitations, to take all ethernet traffic on a port
> and stuff it into a pcap file.)
>
> o NB: for scaling purposes, it is reasonable to implement the pcap
> captures using RSS/RFS to multiple cores and having each core be a thread
> doing pcap file writing; how that would be put into the "vpp graph" might
> be a little less than trivial, but should be straightforward, IMHO)
>
> Thanks in advance.
>
> Brian Dickson
>
> P.S. There is a SERIOUS lack of useful documentation on how to actually do
> this, as a potential ad-hoc contributor. Not sure if you guys have gotten
> this feedback from anyone else.
> P.P.S. I'm using 18.07 because that is the last version that builds
> alongside the vppsb netlink and router plugins.
> P.P.P.S. Even getting 18.07 and vppsb to build was a nightmare. You should
> try doing this from scratch, i.e. put yourselves in the shoes of someone
> who just discovered vpp...
>
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