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Commit: 59d214476403cdc11f8caf5d38a9e358ea3fd2aa

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	.gitignore
	Makefile
	README.rst
	asm_goto_workaround.h
	bpf_insn.h
	bpf_load.c
	bpf_load.h
	cookie_uid_helper_example.c
	cpustat_kern.c
	cpustat_user.c
	fds_example.c
	hash_func01.h
	hbm.c
	hbm.h
	hbm_edt_kern.c
	hbm_kern.h
	hbm_out_kern.c
	lathist_kern.c
	lathist_user.c
	lwt_len_hist.sh
	lwt_len_hist_kern.c
	lwt_len_hist_user.c
	map_perf_test_kern.c
	map_perf_test_user.c
	offwaketime_kern.c
	offwaketime_user.c
	parse_ldabs.c
	parse_simple.c
	parse_varlen.c
	sampleip_kern.c
	sampleip_user.c
	sock_example.c
	sock_example.h
	sock_flags_kern.c
	sockex1_kern.c
	sockex1_user.c
	sockex2_kern.c
	sockex2_user.c
	sockex3_kern.c
	sockex3_user.c
	spintest_kern.c
	spintest_user.c
	syscall_nrs.c
	syscall_tp_kern.c
	syscall_tp_user.c
	task_fd_query_kern.c
	task_fd_query_user.c
	tc_l2_redirect_kern.c
	tc_l2_redirect_user.c
	tcbpf1_kern.c
	tcp_basertt_kern.c
	tcp_bpf.readme
	tcp_bufs_kern.c
	tcp_clamp_kern.c
	tcp_cong_kern.c
	tcp_dumpstats_kern.c
	tcp_iw_kern.c
	tcp_rwnd_kern.c
	tcp_synrto_kern.c
	tcp_tos_reflect_kern.c
	test_cgrp2_array_pin.c
	test_cgrp2_attach.c
	test_cgrp2_sock.c
	test_cgrp2_sock2.c
	test_cgrp2_tc_kern.c
	test_current_task_under_cgroup_kern.c
	test_current_task_under_cgroup_user.c
	test_lru_dist.c
	test_lwt_bpf.c
	test_lwt_bpf.sh
	test_map_in_map_kern.c
	test_map_in_map_user.c
	test_overhead_kprobe_kern.c
	test_overhead_raw_tp_kern.c
	test_overhead_tp_kern.c
	test_overhead_user.c
	test_probe_write_user_kern.c
	test_probe_write_user_user.c
	trace_event_kern.c
	trace_event_user.c
	trace_output_kern.c
	trace_output_user.c
	tracex1_kern.c
	tracex1_user.c
	tracex2_kern.c
	tracex2_user.c
	tracex3_kern.c
	tracex3_user.c
	tracex4_kern.c
	tracex4_user.c
	tracex5_kern.c
	tracex5_user.c
	tracex6_kern.c
	tracex6_user.c
	tracex7_kern.c
	tracex7_user.c
	xdp1_kern.c
	xdp1_user.c
	xdp2_kern.c
	xdp2skb_meta_kern.c
	xdp_adjust_tail_kern.c
	xdp_adjust_tail_user.c
	xdp_fwd_kern.c
	xdp_fwd_user.c
	xdp_monitor_kern.c
	xdp_monitor_user.c
	xdp_redirect_cpu_kern.c
	xdp_redirect_cpu_user.c
	xdp_redirect_kern.c
	xdp_redirect_map_kern.c
	xdp_redirect_map_user.c
	xdp_redirect_user.c
	xdp_router_ipv4_kern.c
	xdp_router_ipv4_user.c
	xdp_rxq_info_kern.c
	xdp_rxq_info_user.c
	xdp_sample_pkts_kern.c
	xdp_sample_pkts_user.c
	xdp_tx_iptunnel_common.h
	xdp_tx_iptunnel_kern.c
	xdp_tx_iptunnel_user.c
	xdpsock_user.c
	do_hbm_test.sh
	run_cookie_uid_helper_example.sh
	tc_l2_redirect.sh
	test_cgrp2_sock.sh
	test_cgrp2_sock2.sh
	test_cgrp2_tc.sh
	test_cls_bpf.sh
	test_ipip.sh
	test_override_return.sh
	xdp2skb_meta.sh

README.rst

eBPF sample programs

This directory contains a test stubs, verifier test-suite and examples for using eBPF. The examples use libbpf from tools/lib/bpf.

Build dependencies

Compiling requires having installed:

clang >= version 3.4.0
llvm >= version 3.7.1

Note that LLVM's tool 'llc' must support target 'bpf', list version and supported targets with command: llc --version

Kernel headers

There are usually dependencies to header files of the current kernel. To avoid installing devel kernel headers system wide, as a normal user, simply call:

make headers_install

This will creates a local "usr/include" directory in the git/build top level directory, that the make system automatically pickup first.

Compiling

For building the BPF samples, issue the below command from the kernel top level directory:

make samples/bpf/

Do notice the "/" slash after the directory name.

It is also possible to call make from this directory. This will just hide the the invocation of make as above with the appended "/".

Manually compiling LLVM with 'bpf' support

Since version 3.7.0, LLVM adds a proper LLVM backend target for the BPF bytecode architecture.

By default llvm will build all non-experimental backends including bpf. To generate a smaller llc binary one can use:

-DLLVM_TARGETS_TO_BUILD="BPF"

Quick sniplet for manually compiling LLVM and clang (build dependencies are cmake and gcc-c++):

$ git clone http://llvm.org/git/llvm.git
$ cd llvm/tools
$ git clone --depth 1 http://llvm.org/git/clang.git
$ cd ..; mkdir build; cd build
$ cmake .. -DLLVM_TARGETS_TO_BUILD="BPF;X86"
$ make -j $(getconf _NPROCESSORS_ONLN)

It is also possible to point make to the newly compiled 'llc' or 'clang' command via redefining LLC or CLANG on the make command line:

make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang

Cross compiling samples

In order to cross-compile, say for arm64 targets, export CROSS_COMPILE and ARCH environment variables before calling make. This will direct make to build samples for the cross target.

export ARCH=arm64 export CROSS_COMPILE="aarch64-linux-gnu-" make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang

source-git / libbpf

Source Code