Hi
I am trying to add a feature (say 'my_node') to ip4_unicast arc.
Goal is just like ip4_gtpu_bypass to by pass the IP stack and process
packets that are of my interest and if packets received are of not my
interest give it back to the ip layer.
At the same time I am trying to use ip4 reassembly on the interface using
CLI. (vppctl set interface reassembly GigabitEthernet13/0/0 on).
So expected graph
For packets of my interest :
dpdk-input --> ip4-input --> ip4-reassembly-feature --> my_node
-->my_next_node ....
Packets that are of not my interest :
dpdk-input --> ip4-input --> ip4-reassembly-feature --> my_node -->
ip4_lookup --> ....
Q1. How are the feature nodes ordered in an arc ?
I tried to order these two feature my-node and
ip4-reassembly-feature using .runs_after like below and was able to
get ip4-reassembly-feature before my-node. And with out using .runs_after,
the order was other way. (my-node --> ip4-reassembly-feature).
VNET_FEATURE_INIT (my_node, static) = {
.arc_name = "ip4-unicast",
.node_name = "my_node",
.runs_before = VNET_FEATURES ("ip4-lookup"),
.runs_after = VNET_FEATURES ("ip4-reassembly-feature"),
};
Is this correct way of doing?
Does the order of feature nodes in an arc depend on the order of enabling
these using the function 'vnet_feature_enable_disable' ?
Q2.
With the above code, I could get my intent working with normal packets of
my interest.
But for packets that are of not my interest I am not able to route them
back to ip4-lookup, instead packets come to my-next-node that succeeds
my-node. I use the function 'vnet_feature_next' to get the next feature in
the arc by default .
that meaning to say
For packets of my interest next = my_next_node
and for packets that are not of my interest next is taken
from vnet_feature_next(vnet_buffer(b0)->sw_if_index[VLIB_RX], &next, b0);
Sorry for the long writings.
Please advice.
Thanks
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