Remote Direct Memory Access (RDMA) over converged Ethernet version 2 (RoCEv2)

RDMA over Converged Ethernet version 2 (RoCEv2) enables high-performance workloads to transfer data across Ethernet networks with minimal latency and packet loss. The feature works by mapping a 6-bit DSCP value in the IP header to a 3-bit PFC priority, which triggers pause frames to notify peers of congestion without dropping packets. You can use DSCP-based Priority Flow Control (PFC) to classify untagged Layer 3 traffic and achieve lossless behavior across Layer 3 connections to Layer 2 subnetworks. The goal is to deliver end-to-end lossless Ethernet networking, improving network efficiency and reducing GPU underutilization caused by network slowdowns.