See URL below. The vpp packet dispatch tracer will show you everything you would want to know about the nodes visited by individual packets:
https://fd.io/docs/vpp/master/gettingstarted/developers/vnet.html#graph-dispatcher-pcap-tracing This is a developer tool, not a tool for post-mortem analysis. HTH... Dave From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of Neale Ranns via Lists.Fd.Io Sent: Tuesday, March 24, 2020 4:06 AM To: Satya Murthy <satyamurthy1...@gmail.com>; vpp-dev@lists.fd.io Cc: vpp-dev@lists.fd.io Subject: Re: [vpp-dev] How to get source node of a buffer Hi Murthy, There is no way to get the source node. However, if you are debugging and you want to see the full history of the graph through which a packet has passed, you can turn on trajectory tracing. #define VLIB_BUFFER_TRACE_TRAJECTORY 1 In vlib/buffer.h /neale From: <vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>> on behalf of Satya Murthy <satyamurthy1...@gmail.com<mailto:satyamurthy1...@gmail.com>> Date: Tuesday 24 March 2020 at 06:44 To: "vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>" <vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>> Subject: [vpp-dev] How to get source node of a buffer Hi , Is there any way to find the source node of a buffer. Basically, I want to know from which node this buffer came. I understand that each graph node shall have a design which is independant of the source node. However, the source node information may be useful in case of debugging some crashes while processing a buffer. Any inputs on this pls. -- Thanks & Regards, Murthy
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