We had 2 DPDK processes - one DPDK primary and multiple DPDK secondary processes and RTE ring between the primary and the secondary processes. The primary had multiple worker threads and each worker thread tx/queues a packet on a RTE ring which is picked up/rx by one of the secondary process. And a secondary DPDK process picks a RTE ring of a worker thread in the primary (based on some tag) and tx/queues the packet on the RTE ring which is then picked up/rx by the worker thread processing that RTE ring.
We are trying to port this code base to VPP world. We have converted DPDK primary to be an extension of VPP by adding required custom graph nodes. The question how do we interface with the secondary DPDK processes since we can't have RTE ring between VPP and DPDK processes We are considering using memif interface between VPP and the DPDK processes which will use memif PMD to tx/rx packets to/from VPP worker threads. In this case the DPDK processes will act as memif slave and VPP as the master Questions are: - How many memif interfaces should we have in VPP - one per VPP worker thread? emulating RTE_ring? If there are N worker threads and M DPDK processes how would it work? Basically we want N worker threads to round robin M DPDK processes and DPDK processes to pick the worker thread on transmit - Should we consider single memif interface in VPP and the use RSS (if supported some kind) to split the traffic to the worker threads? Could a DPDK process steer/tx a packet to a specific worker thread in VPP? - We used to tag additional data in mbuf which was passed around between DPDK primary and DPDK secondary processes. Since memif is a packet interface - how could we tag additional context data between VPP worker thread and DPDK process. Appreciate you help!!!!
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