Re: [dpdk-dev] [PATCH v1 0/3] lib: introduce traffic mirroring lib

[Thomas Monjalon <thomas@monjalon.net>]

Patrick Fu <patrick.fu@intel.com> wrote:
> Network Test Access Point (TAP) is the network monitoring service
> commonly adotpted in SDN-based network infrastructures. When VMs are
> inter-connected over virtual switches, TAP requires vSwitch to mirror
> out network traffics from specific workload VM ports to the TAP
> device/VM ports. Classical mirroring impmentations in vSwitch make an
> extra copy of the source packets, which results in significant degradation
> in the throughput levels vSwitch could normally archieve. Therefore, we
> propose a new set of APIs to support high-throughput packet mirroring
> through hardware offloading.

In the RFC thread, you mentioned you were targetting vhost
where there is no hardware offload.
If it targets hardware offload, it should be in rte_flow.
Even if no device offload, we could implement it in rte_flow.

If you think it does not fit with rte_flow because it is
forwarding traffic between devices, then I think rte_graph
or rte_pipeline may fit.

In general I am against adding a library restricted to some specific
forwarding use cases.