48. Berkeley Packet Filter Library
The DPDK provides an BPF library that gives the ability to load and execute Enhanced Berkeley Packet Filter (eBPF) bytecode within user-space dpdk application.
It supports basic set of features from eBPF spec. Please refer to the eBPF spec <https://www.kernel.org/doc/Documentation/networking/filter.txt> for more information. Also it introduces basic framework to load/unload BPF-based filters on eth devices (right now only via SW RX/TX callbacks).
The library API provides the following basic operations:
- Create a new BPF execution context and load user provided eBPF code into it.
- Destroy an BPF execution context and its runtime structures and free the associated memory.
- Execute eBPF bytecode associated with provided input parameter.
- Provide information about natively compiled code for given BPF context.
- Load BPF program from the ELF file and install callback to execute it on given ethdev port/queue.
48.1. Not currently supported eBPF features
- JIT support only available for X86_64 and arm64 platforms
- tail-pointer call
- eBPF MAP
- external function calls for 32-bit platforms