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authorAlexei Starovoitov <ast@plumgrid.com>2014-12-01 15:06:38 -0800
committerDavid S. Miller <davem@davemloft.net>2014-12-05 21:47:33 -0800
commita80857822b0c2ed608c93504bd3687b78f20c619 (patch)
tree8fb218a13a13a16d5083c7b831398f967137f152 /samples/bpf/Makefile
parent249b812d8005ec38e351ee763ceb85d56b155064 (diff)
downloadlinux-a80857822b0c2ed608c93504bd3687b78f20c619.tar.gz
samples: bpf: trivial eBPF program in C
this example does the same task as previous socket example in assembler, but this one does it in C. eBPF program in kernel does: /* assume that packet is IPv4, load one byte of IP->proto */ int index = load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol)); long *value; value = bpf_map_lookup_elem(&my_map, &index); if (value) __sync_fetch_and_add(value, 1); Corresponding user space reads map[tcp], map[udp], map[icmp] and prints protocol stats every second 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/Makefile14
1 files changed, 14 insertions, 0 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index f46d3492d032..770d145186c3 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -4,12 +4,26 @@ obj- := dummy.o
# List of programs to build
hostprogs-y := test_verifier test_maps
hostprogs-y += sock_example
+hostprogs-y += sockex1
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
# Tell kbuild to always build the programs
always := $(hostprogs-y)
+always += sockex1_kern.o
HOSTCFLAGS += -I$(objtree)/usr/include
+
+HOSTCFLAGS_bpf_load.o += -I$(objtree)/usr/include -Wno-unused-variable
+HOSTLOADLIBES_sockex1 += -lelf
+
+# point this to your LLVM backend with bpf support
+LLC=$(srctree)/tools/bpf/llvm/bld/Debug+Asserts/bin/llc
+
+%.o: %.c
+ clang $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \
+ -D__KERNEL__ -Wno-unused-value -Wno-pointer-sign \
+ -O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@