Hi Padraig,
From: [email protected] <[email protected]> on behalf of Pádraig Connolly
via lists.fd.io <[email protected]>
Date: Saturday, 1 October 2022 at 09:52
To: [email protected] <[email protected]>
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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