b5e00ab907
Cherry-pick from commit d8c5b17f2bc0de09fbbfa14d90e8168163a579e7 Add a simple userpace program to demonstrate the new API to attach eBPF programs to cgroups. This is what it does: * Create arraymap in kernel with 4 byte keys and 8 byte values * Load eBPF program The eBPF program accesses the map passed in to store two pieces of information. The number of invocations of the program, which maps to the number of packets received, is stored to key 0. Key 1 is incremented on each iteration by the number of bytes stored in the skb. * Detach any eBPF program previously attached to the cgroup * Attach the new program to the cgroup using BPF_PROG_ATTACH * Once a second, read map[0] and map[1] to see how many bytes and packets were seen on any socket of tasks in the given cgroup. The program takes a cgroup path as 1st argument, and either "ingress" or "egress" as 2nd. Optionally, "drop" can be passed as 3rd argument, which will make the generated eBPF program return 0 instead of 1, so the kernel will drop the packet. libbpf gained two new wrappers for the new syscall commands. Signed-off-by: Daniel Mack <daniel@zonque.org> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> Bug: 30950746 Change-Id: I011436a755abd62050edd22e47995c166a0bd8a2 Signed-off-by: Chatur27 <jasonbright2709@gmail.com>
104 lines
3.7 KiB
Makefile
104 lines
3.7 KiB
Makefile
# kbuild trick to avoid linker error. Can be omitted if a module is built.
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obj- := dummy.o
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# List of programs to build
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hostprogs-y := test_verifier test_maps
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hostprogs-y += sock_example
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hostprogs-y += fds_example
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hostprogs-y += sockex1
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hostprogs-y += sockex2
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hostprogs-y += sockex3
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hostprogs-y += tracex1
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hostprogs-y += tracex2
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hostprogs-y += tracex3
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hostprogs-y += tracex4
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hostprogs-y += tracex5
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hostprogs-y += tracex6
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hostprogs-y += trace_output
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hostprogs-y += lathist
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hostprogs-y += offwaketime
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hostprogs-y += spintest
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hostprogs-y += map_perf_test
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hostprogs-y += test_overhead
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hostprogs-y += test_cgrp2_array_pin
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hostprogs-y += test_cgrp2_attach
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test_verifier-objs := test_verifier.o libbpf.o
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test_maps-objs := test_maps.o libbpf.o
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sock_example-objs := sock_example.o libbpf.o
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fds_example-objs := bpf_load.o libbpf.o fds_example.o
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sockex1-objs := bpf_load.o libbpf.o sockex1_user.o
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sockex2-objs := bpf_load.o libbpf.o sockex2_user.o
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sockex3-objs := bpf_load.o libbpf.o sockex3_user.o
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tracex1-objs := bpf_load.o libbpf.o tracex1_user.o
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tracex2-objs := bpf_load.o libbpf.o tracex2_user.o
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tracex3-objs := bpf_load.o libbpf.o tracex3_user.o
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tracex4-objs := bpf_load.o libbpf.o tracex4_user.o
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tracex5-objs := bpf_load.o libbpf.o tracex5_user.o
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tracex6-objs := bpf_load.o libbpf.o tracex6_user.o
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trace_output-objs := bpf_load.o libbpf.o trace_output_user.o
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lathist-objs := bpf_load.o libbpf.o lathist_user.o
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offwaketime-objs := bpf_load.o libbpf.o offwaketime_user.o
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spintest-objs := bpf_load.o libbpf.o spintest_user.o
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map_perf_test-objs := bpf_load.o libbpf.o map_perf_test_user.o
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test_overhead-objs := bpf_load.o libbpf.o test_overhead_user.o
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test_cgrp2_array_pin-objs := libbpf.o test_cgrp2_array_pin.o
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test_cgrp2_attach-objs := libbpf.o test_cgrp2_attach.o
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# Tell kbuild to always build the programs
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always := $(hostprogs-y)
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always += sockex1_kern.o
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always += sockex2_kern.o
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always += sockex3_kern.o
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always += tracex1_kern.o
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always += tracex2_kern.o
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always += tracex3_kern.o
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always += tracex4_kern.o
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always += tracex5_kern.o
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always += tracex6_kern.o
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always += trace_output_kern.o
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always += tcbpf1_kern.o
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always += lathist_kern.o
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always += offwaketime_kern.o
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always += spintest_kern.o
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always += map_perf_test_kern.o
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always += test_overhead_tp_kern.o
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always += test_overhead_kprobe_kern.o
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always += parse_varlen.o parse_simple.o parse_ldabs.o
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always += test_cgrp2_tc_kern.o
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HOSTCFLAGS += -I$(objtree)/usr/include
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HOSTCFLAGS_bpf_load.o += -I$(objtree)/usr/include -Wno-unused-variable
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HOSTLOADLIBES_fds_example += -lelf
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HOSTLOADLIBES_sockex1 += -lelf
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HOSTLOADLIBES_sockex2 += -lelf
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HOSTLOADLIBES_sockex3 += -lelf
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HOSTLOADLIBES_tracex1 += -lelf
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HOSTLOADLIBES_tracex2 += -lelf
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HOSTLOADLIBES_tracex3 += -lelf
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HOSTLOADLIBES_tracex4 += -lelf -lrt
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HOSTLOADLIBES_tracex5 += -lelf
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HOSTLOADLIBES_tracex6 += -lelf
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HOSTLOADLIBES_trace_output += -lelf -lrt
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HOSTLOADLIBES_lathist += -lelf
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HOSTLOADLIBES_offwaketime += -lelf
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HOSTLOADLIBES_spintest += -lelf
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HOSTLOADLIBES_map_perf_test += -lelf -lrt
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HOSTLOADLIBES_test_overhead += -lelf -lrt
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# point this to your LLVM backend with bpf support
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LLC=$(srctree)/tools/bpf/llvm/bld/Debug+Asserts/bin/llc
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# asm/sysreg.h inline assmbly used by it is incompatible with llvm.
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# But, ehere is not easy way to fix it, so just exclude it since it is
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# useless for BPF samples.
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$(obj)/%.o: $(src)/%.c
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clang $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \
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-D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \
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-Wno-compare-distinct-pointer-types \
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-O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@
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clang $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \
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-D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \
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-O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=asm -o $@.s
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