-----Original Message----- > Date: Fri, 6 Apr 2018 19:49:32 +0100 > From: Konstantin Ananyev <konstantin.anan...@intel.com> > To: dev@dpdk.org > CC: Konstantin Ananyev <konstantin.anan...@intel.com> > Subject: [dpdk-dev] [PATCH v3 00/10] add framework to load and execute BPF > code > X-Mailer: git-send-email 1.7.0.7 > > BPF is used quite intensively inside Linux (and BSD) kernels > for various different purposes and proved to be extremely useful. > > BPF inside DPDK might also be used in a lot of places > for a lot of similar things. > As an example to: > - packet filtering/tracing (aka tcpdump) > - packet classification > - statistics collection > - HW/PMD live-system debugging/prototyping - trace HW descriptors, > internal PMD SW state, etc. > - Comeup with your own idea > > All of that in a dynamic, user-defined and extensible manner. > > So these series introduce new library - librte_bpf. > librte_bpf provides API to load and execute BPF bytecode within > user-space dpdk app. > It supports basic set of features from eBPF spec. > Also it introduces basic framework to load/unload BPF-based filters > on eth devices (right now via SW RX/TX callbacks). > > How to try it: > =============== > > 1) run testpmd as usual and start your favorite forwarding case. > 2) build bpf program you'd like to load > (you'll need clang v3.7 or above): > $ cd test/bpf > $ clang -O2 -target bpf -c t1.c > > 3) load bpf program(s): > testpmd> bpf-load rx|tx <portid> <queueid> <load-flags> <bpf-prog-filename> > > <load-flags>: [-][J][M] > J - use JIT generated native code, otherwise BPF interpreter will be used. > M - assume input parameter is a pointer to rte_mbuf, > otherwise assume it is a pointer to first segment's data. > > Few examples: > > # to load (not JITed) dummy.o at TX queue 0, port 0: > testpmd> bpf-load tx 0 0 - ./dpdk.org/test/bpf/dummy.o > #to load (and JIT compile) t1.o at RX queue 0, port 1: > testpmd> bpf-load rx 1 0 J ./dpdk.org/test/bpf/t1.o > > #to load and JIT t3.o (note that it expects mbuf as an input): > testpmd> bpf-load rx 2 0 JM ./dpdk.org/test/bpf/t3.o > > 4) observe changed traffic behavior > Let say with the examples above: > - dummy.o does literally nothing, so no changes should be here, > except some possible slowdown. > - t1.o - should force to drop all packets that doesn't match: > 'dst 1.2.3.4 && udp && dst port 5000' filter. > - t3.o - should dump to stdout ARP packets. > > 5) unload some or all bpf programs: > testpmd> bpf-unload tx 0 0 > > 6) continue with step 3) or exit > > Not currently supported features: > ================================= > - cBPF > - tail-pointer call > - eBPF MAP > - JIT for non X86_64 targets
May be for next release, we are planning to add arm64 JIT support. Just wondering, How do you test all EBPF opcodes in JIT/Interpreter mode? Are you planning to add any UT like linux kernel in dpdk ? or it was similar to https://github.com/iovisor/ubpf/tree/master/tests ? Just asking because, when we introduce arm64 JIT support similar test cases should be required to verify the implementation.
