BPF is used quite intensively inside Linux (and BSD) kernels
for various different purposes and proved to be extremely useful.
In theory, 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.
...
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 supported 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 t2.o (note that it expects mbuf as an input):
testpmd> bpf-load rx 2 0 JM ./dpdk.org/test/bpf/t2.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.
5) unload some or all bpf programs:
testpmd> bpf-unload tx 0 0
6) continue with step 3) or exit
TODO list:
=========
- meson build
- UT for it
- implement proper validate()
- allow JIT to generate bulk version
Not currently supported features:
=================================
- cBPF
- tail-pointer call
- eBPF MAP
- skb
Konstantin Ananyev (5):
bpf: add BPF loading and execution framework
bpf: add JIT compilation for x86_64 ISA.
bpf: introduce basic RX/TX BPF filters
testpmd: new commands to load/unload BPF filters
test: add few eBPF samples
app/test-pmd/cmdline.c | 144 +++++
config/common_base | 5 +
config/common_linuxapp | 1 +
lib/Makefile | 2 +
lib/librte_bpf/Makefile | 35 ++
lib/librte_bpf/bpf.c | 52 ++
lib/librte_bpf/bpf_exec.c | 453 ++++++++++++++
lib/librte_bpf/bpf_impl.h | 37 ++
lib/librte_bpf/bpf_jit_x86.c | 1155 ++++++++++++++++++++++++++++++++++++
lib/librte_bpf/bpf_load.c | 344 +++++++++++
lib/librte_bpf/bpf_pkt.c | 524 ++++++++++++++++
lib/librte_bpf/bpf_validate.c | 55 ++
lib/librte_bpf/rte_bpf.h | 154 +++++
lib/librte_bpf/rte_bpf_ethdev.h | 50 ++
lib/librte_bpf/rte_bpf_version.map | 16 +
mk/rte.app.mk | 2 +
test/bpf/dummy.c | 20 +
test/bpf/mbuf.h | 556 +++++++++++++++++
test/bpf/t1.c | 54 ++
test/bpf/t2.c | 31 +
20 files changed, 3690 insertions(+)
create mode 100644 lib/librte_bpf/Makefile
create mode 100644 lib/librte_bpf/bpf.c
create mode 100644 lib/librte_bpf/bpf_exec.c
create mode 100644 lib/librte_bpf/bpf_impl.h
create mode 100644 lib/librte_bpf/bpf_jit_x86.c
create mode 100644 lib/librte_bpf/bpf_load.c
create mode 100644 lib/librte_bpf/bpf_pkt.c
create mode 100644 lib/librte_bpf/bpf_validate.c
create mode 100644 lib/librte_bpf/rte_bpf.h
create mode 100644 lib/librte_bpf/rte_bpf_ethdev.h
create mode 100644 lib/librte_bpf/rte_bpf_version.map
create mode 100644 test/bpf/dummy.c
create mode 100644 test/bpf/mbuf.h
create mode 100644 test/bpf/t1.c
create mode 100644 test/bpf/t2.c
--
2.13.6
