From 65d472fb007dd73ef28f70078f43f86bb6cc67d0 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Thu, 5 May 2016 19:49:14 -0700 Subject: samples/bpf: add 'pointer to packet' tests parse_simple.c - packet parser exapmle with single length check that filters out udp packets for port 9 parse_varlen.c - variable length parser that understand multiple vlan headers, ipip, ipip6 and ip options to filter out udp or tcp packets on port 9. The packet is parsed layer by layer with multitple length checks. parse_ldabs.c - classic style of packet parsing using LD_ABS instruction. Same functionality as parse_simple. simple = 24.1Mpps per core varlen = 22.7Mpps ldabs = 21.4Mpps Parser with LD_ABS instructions is slower than full direct access parser which does more packet accesses and checks. These examples demonstrate the choice bpf program authors can make between flexibility of the parser vs speed. Signed-off-by: Alexei Starovoitov Signed-off-by: David S. Miller --- samples/bpf/Makefile | 2 ++ 1 file changed, 2 insertions(+) (limited to 'samples/bpf/Makefile') diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index 66897e61232c..0bf2478cb7df 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -60,6 +60,7 @@ always += spintest_kern.o always += map_perf_test_kern.o always += test_overhead_tp_kern.o always += test_overhead_kprobe_kern.o +always += parse_varlen.o parse_simple.o parse_ldabs.o HOSTCFLAGS += -I$(objtree)/usr/include @@ -120,4 +121,5 @@ $(src)/*.c: verify_target_bpf $(obj)/%.o: $(src)/%.c $(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \ -D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \ + -Wno-compare-distinct-pointer-types \ -O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@ -- cgit v1.2.1