Hi Padraig, From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> on behalf of Pádraig Connolly via lists.fd.io <pcpadraigconnolly96=gmail....@lists.fd.io> Date: Saturday, 1 October 2022 at 09:52 To: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> Subject: [vpp-dev] Insert Custom Node Into ip4-unicast Feature Arc Hi,
For purely my own learning, I am trying to insert my custom node into the ip4-unicast feature arc. Based on what I know so far, I would expect the following FEATURE_INIT struct to achieve what I want : VNET_FEATURE_INIT (padraig, static) = { .arc_name = "ip4-unicast", .node_name = "padraig", .runs_before = VNET_FEATURES ("ip4-lookup"), }; This and a call to vnet_feature_enable_disable(“ip4-unicast”, “Padraig”, sw_if_index_foo, 1, NULL, 0) shoud be all you need. But sadly no vectors reach my custom node "padraig" when I send a IPv4 ping through (A trace shows no interaction with the vector). The next thing I tried was: VNET_FEATURE_INIT (padraig, static) = { .arc_name = "ip4-unicast", .node_name = "padraig", .runs_after = VNET_FEATURES ("ip4-input"), .runs_before = VNET_FEATURES ("ip4-lookup"), }; But with this I get the following runtime error: vpp[39613]: vnet_feature_arc_init:272: feature node 'ip4-input' not found (before 'padraig', arc 'ip4-unicast') ip4-input is the node at which the ip4 input feature arcs start, so it is not a feature on the arc, therefore other nodes cannot run before it. I have inserted the node in the device-input feature arc before ethernet-input as per the wiki doc and it works perfectly but should I assume ip4-unicast feature arc is not really meant to have any custom nodes added to it? Or is this just a bad configuration on my side? Ip4-unicast can have custom features added, see e.g. IP reassembly; ip4_full_reass_enable_disable() For vectors to reach my node, does a vnet node have to have my custom node set as a "next_node"? No. next nodes automatically added when the feature is enabled for the first time. /neale Thanks in advance, Padraig
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