Hi,
I'm trying to grasp how features arcs are done in the code. And have a couple
of questions
1. Is a feature a representation of a node ?
2. Does ".next_nodes" from VLIB_REGISTER_NODE() restrain to which nodes the
.function() primitive may send it to?
3. I'm trying to grasp how the feature arhitecture has been thought. I started
by looking the "nsh" plugin.
>From what I understand:
VNET_FEATURE_ARC_INIT() creates an empty Arc of nodes/features
.start_nodes from VNET_FEATURE_ARC_INIT() says/adds where the Arc processing
starts
VNET_FEATURE_INIT() adds nodes/features to the Arc
.runs_before from VNET_FEATURE_INIT() and .next_nodes from VLIB_REGISTER_NODE()
give the vertices/dependencies in the Arc
Everything in "nsh" seems to start from the "nsh_midchain_node" node.
How is the "nsh_eth_output_node" triggered? I see it has the same name as the
Arc name ("nsh-eth-output"). Does this have any relevance or it is just a
coincidence of name? Does a node which belongs to no Arc get triggered directly
with no dependency?
4. It is not clear to me who initializes the "nm->output_feature_arc_index"
entry.
Best regards,
Catalin Vasile
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