diff options
| author | Alexei Starovoitov <ast@plumgrid.com> | 2014-12-01 15:06:39 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-12-05 21:47:34 -0800 |
| commit | fbe3310840c65f3cf97dd90d23e177d061c376f2 (patch) | |
| tree | ee28163a6c53e0131fd2d3d626d02b0610eaed2b /samples/bpf/Makefile | |
| parent | a80857822b0c2ed608c93504bd3687b78f20c619 (diff) | |
samples: bpf: large eBPF program in C
sockex2_kern.c is purposefully large eBPF program in C.
llvm compiles ~200 lines of C code into ~300 eBPF instructions.
It's similar to __skb_flow_dissect() to demonstrate that complex packet parsing
can be done by eBPF.
Then it uses (struct flow_keys)->dst IP address (or hash of ipv6 dst) to keep
stats of number of packets per IP.
User space loads eBPF program, attaches it to loopback interface and prints
dest_ip->#packets stats every second.
Usage:
$sudo samples/bpf/sockex2
ip 127.0.0.1 count 19
ip 127.0.0.1 count 178115
ip 127.0.0.1 count 369437
ip 127.0.0.1 count 559841
ip 127.0.0.1 count 750539
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf/Makefile')
| -rw-r--r-- | samples/bpf/Makefile | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index 770d145186c3..b5b3600dcdf5 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -5,20 +5,24 @@ obj- := dummy.o hostprogs-y := test_verifier test_maps hostprogs-y += sock_example hostprogs-y += sockex1 +hostprogs-y += sockex2 test_verifier-objs := test_verifier.o libbpf.o test_maps-objs := test_maps.o libbpf.o sock_example-objs := sock_example.o libbpf.o sockex1-objs := bpf_load.o libbpf.o sockex1_user.o +sockex2-objs := bpf_load.o libbpf.o sockex2_user.o # Tell kbuild to always build the programs always := $(hostprogs-y) always += sockex1_kern.o +always += sockex2_kern.o HOSTCFLAGS += -I$(objtree)/usr/include HOSTCFLAGS_bpf_load.o += -I$(objtree)/usr/include -Wno-unused-variable HOSTLOADLIBES_sockex1 += -lelf +HOSTLOADLIBES_sockex2 += -lelf # point this to your LLVM backend with bpf support LLC=$(srctree)/tools/bpf/llvm/bld/Debug+Asserts/bin/llc |