.. SPDX-License-Identifier: BSD-3-Clause Copyright(c) 2020 Intel Corporation. Driver for the Intel® Dynamic Load Balancer (DLB2) ================================================== The DPDK dlb poll mode driver supports the Intel® Dynamic Load Balancer. Prerequisites ------------- Follow the DPDK :ref:`Getting Started Guide for Linux ` to setup the basic DPDK environment. Configuration ------------- The DLB2 PF PMD is a user-space PMD that uses VFIO to gain direct device access. To use this operation mode, the PCIe PF device must be bound to a DPDK-compatible VFIO driver, such as vfio-pci. Eventdev API Notes ------------------ The DLB2 provides the functions of a DPDK event device; specifically, it supports atomic, ordered, and parallel scheduling events from queues to ports. However, the DLB2 hardware is not a perfect match to the eventdev API. Some DLB2 features are abstracted by the PMD such as directed ports. In general the dlb PMD is designed for ease-of-use and does not require a detailed understanding of the hardware, but these details are important when writing high-performance code. This section describes the places where the eventdev API and DLB2 misalign. Flow ID ~~~~~~~ The flow ID field is preserved in the event when it is scheduled in the DLB2.