Challenges and Gaps in OvS-DPDK Acceleration
OvS-DPDK faces architecture and implementation gaps in offload capability discovery and flow validation, lacking support for certain actions and management interfaces. There is a need to address dynamic rebalancing, error reporting, and integration with Openstack/OVN to enhance acceleration and offload efficiency.
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December 10-11, 2019 | Westford, MA OvS-DPDK Acceleration with rte_flow: Challenges and Gaps Dr. Hemal V. Shah and Sriharsha Basavapatna, Broadcom Inc.
OvS-DPDK Acceleration Architecture Gaps Offload capability missing discovery rte_flow_validate: to validate a flow for offload Issues: extra operation, lack of specific error info OvS-DPDK does not even use rte_flow_validate Need to optimize design for capability discovery Challenges with offload on vhost-user port Actions offload is not supported for ingress flows Software lookup is needed for egress flows Actions offload is also not supported for egress flows DPDK VF Representor (VF-Rep) management plane CLI or management I/F does not exist VF creation/destruction is outside of DPDK environment PF PMD can t be used for VF management Vendor specific creation/destruction of VF-Rep A possible fix: dedicate a VF PMD for VF-Reps mgmt
OvS-DPDK Acceleration Implementation Gaps Actions Offload (partial and full) Supported: MARK, RSS Not supported: OUTPUT, DROP, COUNT, VF, ENCAP, DECAP, METER, etc. Control Plane APIs Supported: Add, Delete Not supported: Dump, Flush, Stat Recent full offload patches try to address this No error reporting for offloaded flows Need to refine
Other OvS-DPDK Offload Considerations Dynamic Rebalance does not exist, needed for capacity mgmt. Kernel and user/dpdk datapath differ w.r.t offloads kernel/tc : flow added to either DP or HW dpdk: flow added to both DP and HW Impacts dynamic rebalancing logic need consistency Leverage Out-Of-Resources (ENOSPC) error reporting from PMDs Need error propagation from dpif-netdev back to ofproto-dpif Openstack/OVN Integration Let us advance and improve OvS-DPDK acceleration/offload.
