Dear Dave: Thanks a lot for the information! I have a follow up question with regard to when a plugin should allocate its global resources.
Plugins doesn't unload/reload during VPP process looks like the expectation for a plugin to not allocate any resources during its plugin_init function since it will not have an opportunity to free it. The plugin should rather have some API to "enable feature" where it does the bulk of allocation and free the resources in its "disable feature" API. With the sample plugin example, what I see is that the plugin_init just hooks up APIs (init with the VPP framework), but the actual "feature enable" API modifies the graph (init sample plugin). In general, what's the responsibility of initialization for plugin init vs a separate API to enable the feature? Should plugin init just do some minimal/basic registration related work with VPP framework and leave plugin specific work during "feature enable"? Thanks, -Ray From: Dave Barach (dbarach) <dbar...@cisco.com> Sent: Friday, October 19, 2018 4:35 AM To: Ray Cai <ru...@microsoft.com>; vpp-dev@lists.fd.io Subject: RE: Question about VPP plugin/node's life cycle Dear Ray, As you probably suspect: plugins are neither unloaded nor reloaded. HTH... Dave From: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io> <vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>> On Behalf Of Rui Cai via Lists.Fd.Io Sent: Thursday, October 18, 2018 9:43 PM To: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io> Cc: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io> Subject: [SUSPICIOUS] [vpp-dev] Question about VPP plugin/node's life cycle Hello vpp experts: I'm trying to figure out a plugin/node's life cycle with in VPP process. There is very rich code/documentation talking about plugin registration/initialization and node registration. I understand that nodes are created during node graph build up and during plugin init function I can further manipulate the edges of my nodes. However, I'm having trouble finding the code that handles node tear down/plugin un-initialization. Does VPP have a notion of plugin/node un-initialization? For example, if my plugin allocated some object during init, I would expect to free it in un-init. If there is such concept, what should I search to find them? Or pretty much the node/plugin lives as long as the VPP process is running and the plugin/node life cycle is never going to be shorter than VPP process? Thanks a lot! -Ray
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