linux/samples/bpf
Yonghong Song 533350227d samples/bpf: fix a build issue
With latest net-next:

====
clang  -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/6.3.1/include -I./arch/x86/include -I./arch/x86/include/generated/uapi -I./arch/x86/include/generated  -I./include -I./arch/x86/include/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/kconfig.h  -Isamples/bpf \
    -D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \
    -Wno-compare-distinct-pointer-types \
    -Wno-gnu-variable-sized-type-not-at-end \
    -Wno-address-of-packed-member -Wno-tautological-compare \
    -Wno-unknown-warning-option \
    -O2 -emit-llvm -c samples/bpf/tcp_synrto_kern.c -o -| llc -march=bpf -filetype=obj -o samples/bpf/tcp_synrto_kern.o
samples/bpf/tcp_synrto_kern.c:20:10: fatal error: 'bpf_endian.h' file not found
          ^~~~~~~~~~~~~~
1 error generated.
====

net has the same issue.

Add support for ntohl and htonl in tools/testing/selftests/bpf/bpf_endian.h.
Also move bpf_helpers.h from samples/bpf to selftests/bpf and change
compiler include logic so that programs in samples/bpf can access the headers
in selftests/bpf, but not the other way around.

Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Lawrence Brakmo <brakmo@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-07-11 20:51:29 -07:00
..
bpf_load.c bpf: fix return in load_bpf_file 2017-07-05 09:05:28 +01:00
bpf_load.h samples/bpf: export map_data[] for more info on maps 2017-05-03 09:30:24 -04:00
cgroup_helpers.c samples, bpf: Refactor test_current_task_under_cgroup - separate out helpers 2016-12-03 16:07:11 -05:00
cgroup_helpers.h samples, bpf: Refactor test_current_task_under_cgroup - separate out helpers 2016-12-03 16:07:11 -05:00
cookie_uid_helper_example.c samples/bpf: run cleanup routines when receiving SIGTERM 2017-05-11 21:43:30 -04:00
fds_example.c samples/bpf: Move open_raw_sock to separate header 2016-12-20 12:00:40 -03:00
lathist_kern.c bpf: BPF based latency tracing 2015-06-23 06:09:58 -07:00
lathist_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
libbpf.h A Sample of using socket cookie and uid for traffic monitoring 2017-03-23 17:01:57 -07:00
load_sock_ops.c bpf: program to load and attach sock_ops BPF progs 2017-07-01 16:15:13 -07:00
lwt_len_hist_kern.c bpf: Add tests and samples for LWT-BPF 2016-12-02 10:52:00 -05:00
lwt_len_hist_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
lwt_len_hist.sh bpf: Add tests and samples for LWT-BPF 2016-12-02 10:52:00 -05:00
Makefile samples/bpf: fix a build issue 2017-07-11 20:51:29 -07:00
map_perf_test_kern.c bpf: lru: Add map-in-map LRU example 2017-04-17 13:55:52 -04:00
map_perf_test_user.c samples/bpf: load_bpf.c make callback fixup more flexible 2017-05-03 09:30:24 -04:00
offwaketime_kern.c bpf, samples: don't zero data when not needed 2016-04-14 21:40:42 -04:00
offwaketime_user.c samples/bpf: run cleanup routines when receiving SIGTERM 2017-05-11 21:43:30 -04:00
parse_ldabs.c bpf: fix samples to add fake KBUILD_MODNAME 2016-10-29 14:46:12 -04:00
parse_simple.c bpf: fix samples to add fake KBUILD_MODNAME 2016-10-29 14:46:12 -04:00
parse_varlen.c bpf: fix samples to add fake KBUILD_MODNAME 2016-10-29 14:46:12 -04:00
README.rst samples/bpf: Switch over to libbpf 2016-12-20 12:00:38 -03:00
run_cookie_uid_helper_example.sh Sample program using SO_COOKIE 2017-04-08 08:07:01 -07:00
sampleip_kern.c bpf/samples: Fix PT_REGS_IP on s390x and use it 2016-11-28 16:26:46 -05:00
sampleip_user.c samples/bpf: run cleanup routines when receiving SIGTERM 2017-05-11 21:43:30 -04:00
sock_example.c samples/bpf: Move open_raw_sock to separate header 2016-12-20 12:00:40 -03:00
sock_example.h samples/bpf sock_example: Avoid getting ethhdr from two includes 2016-12-27 21:49:17 -03:00
sock_flags_kern.c samples/bpf: add userspace example for prohibiting sockets 2016-12-02 13:46:09 -05:00
sockex1_kern.c
sockex1_user.c samples/bpf: Move open_raw_sock to separate header 2016-12-20 12:00:40 -03:00
sockex2_kern.c samples/bpf: fix sockex2 example 2016-11-24 16:04:52 -05:00
sockex2_user.c samples/bpf: Move open_raw_sock to separate header 2016-12-20 12:00:40 -03:00
sockex3_kern.c bpf samples: fix compiler errors with sockex2 and sockex3 2016-09-27 03:48:58 -04:00
sockex3_user.c bpf: Add test for syscall on fd array/htab lookup 2017-06-29 13:13:26 -04:00
spintest_kern.c samples/bpf: Enable powerpc support 2016-04-06 16:01:29 -04:00
spintest_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
syscall_nrs.c samples/bpf: Fix tracex5 to work with MIPS syscalls. 2017-06-14 15:03:23 -04:00
tc_l2_redirect_kern.c bpf: fix samples xdp_tx_iptunnel and tc_l2_redirect with fake KBUILD_MODNAME 2017-01-20 12:04:07 -05:00
tc_l2_redirect_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
tc_l2_redirect.sh bpf: Add test for bpf_redirect to ipip/ip6tnl 2016-11-12 23:38:07 -05:00
tcbpf1_kern.c bpf: fix samples to add fake KBUILD_MODNAME 2016-10-29 14:46:12 -04:00
tcbpf2_kern.c bpf: fix samples to add fake KBUILD_MODNAME 2016-10-29 14:46:12 -04:00
tcp_bufs_kern.c bpf: Sample BPF program to set buffer sizes 2017-07-01 16:15:14 -07:00
tcp_clamp_kern.c bpf: Sample bpf program to set sndcwnd clamp 2017-07-01 16:15:14 -07:00
tcp_cong_kern.c bpf: Sample BPF program to set congestion control 2017-07-01 16:15:14 -07:00
tcp_iw_kern.c bpf: Sample BPF program to set initial cwnd 2017-07-01 16:15:14 -07:00
tcp_rwnd_kern.c bpf: Sample bpf program to set initial window 2017-07-01 16:15:13 -07:00
tcp_synrto_kern.c bpf: Sample bpf program to set SYN/SYN-ACK RTOs 2017-07-01 16:15:13 -07:00
test_cgrp2_array_pin.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
test_cgrp2_attach2.c bpf: introduce BPF_F_ALLOW_OVERRIDE flag 2017-02-12 21:52:19 -05:00
test_cgrp2_attach.c bpf: introduce BPF_F_ALLOW_OVERRIDE flag 2017-02-12 21:52:19 -05:00
test_cgrp2_sock2.c bpf: introduce BPF_F_ALLOW_OVERRIDE flag 2017-02-12 21:52:19 -05:00
test_cgrp2_sock2.sh samples/bpf: add userspace example for prohibiting sockets 2016-12-02 13:46:09 -05:00
test_cgrp2_sock.c bpf: introduce BPF_F_ALLOW_OVERRIDE flag 2017-02-12 21:52:19 -05:00
test_cgrp2_sock.sh samples: bpf: add userspace example for modifying sk_bound_dev_if 2016-12-02 13:46:08 -05:00
test_cgrp2_tc_kern.c bpf: fix samples to add fake KBUILD_MODNAME 2016-10-29 14:46:12 -04:00
test_cgrp2_tc.sh cgroup: bpf: Add an example to do cgroup checking in BPF 2016-07-01 16:32:13 -04:00
test_cls_bpf.sh samples/bpf: add 'pointer to packet' tests 2016-05-06 16:01:54 -04:00
test_current_task_under_cgroup_kern.c samples/bpf: Add test_current_task_under_cgroup test 2016-08-12 21:49:42 -07:00
test_current_task_under_cgroup_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
test_ipip.sh samples/bpf: add comprehensive ipip, ipip6, ip6ip6 test 2016-09-17 10:13:07 -04:00
test_lru_dist.c samples/bpf: check before defining offsetof 2017-04-24 16:20:19 -04:00
test_lwt_bpf.c bpf: Add tests and samples for LWT-BPF 2016-12-02 10:52:00 -05:00
test_lwt_bpf.sh bpf: Add tests and samples for LWT-BPF 2016-12-02 10:52:00 -05:00
test_map_in_map_kern.c bpf: Add tests for map-in-map 2017-03-22 15:45:45 -07:00
test_map_in_map_user.c bpf: Add test for syscall on fd array/htab lookup 2017-06-29 13:13:26 -04:00
test_overhead_kprobe_kern.c samples/bpf: add tracepoint vs kprobe performance tests 2016-04-07 21:04:27 -04:00
test_overhead_tp_kern.c samples/bpf: add tracepoint vs kprobe performance tests 2016-04-07 21:04:27 -04:00
test_overhead_user.c samples/bpf: add tracepoint vs kprobe performance tests 2016-04-07 21:04:27 -04:00
test_probe_write_user_kern.c samples/bpf: Add test/example of using bpf_probe_write_user bpf helper 2016-07-25 18:07:48 -07:00
test_probe_write_user_user.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
test_tunnel_bpf.sh samples/bpf: extend test_tunnel_bpf.sh with IPIP test 2016-09-17 10:13:07 -04:00
trace_event_kern.c bpf/samples: Fix PT_REGS_IP on s390x and use it 2016-11-28 16:26:46 -05:00
trace_event_user.c samples/bpf: add tests for more perf event types 2017-06-04 21:58:15 -04:00
trace_output_kern.c samples/bpf: fix trace_output example 2016-04-28 17:29:45 -04:00
trace_output_user.c samples/bpf trace_output_user: Remove duplicate sys/ioctl.h include 2016-12-28 10:47:13 -03:00
tracex1_kern.c bpf, samples: don't zero data when not needed 2016-04-14 21:40:42 -04:00
tracex1_user.c samples/bpf: Add simple non-portable kprobe filter example 2015-04-02 13:25:50 +02:00
tracex2_kern.c bpf, samples: don't zero data when not needed 2016-04-14 21:40:42 -04:00
tracex2_user.c samples/bpf: run cleanup routines when receiving SIGTERM 2017-05-11 21:43:30 -04:00
tracex3_kern.c samples/bpf: update tracex[23] examples to use per-cpu maps 2016-02-06 03:34:36 -05:00
tracex3_user.c samples/bpf: adjust rlimit RLIMIT_MEMLOCK for traceex2, tracex3 and tracex4 2017-05-03 09:30:23 -04:00
tracex4_kern.c samples/bpf: Enable powerpc support 2016-04-06 16:01:29 -04:00
tracex4_user.c samples/bpf: adjust rlimit RLIMIT_MEMLOCK for traceex2, tracex3 and tracex4 2017-05-03 09:30:23 -04:00
tracex5_kern.c samples/bpf: Fix tracex5 to work with MIPS syscalls. 2017-06-14 15:03:23 -04:00
tracex5_user.c bpf samples: update tracex5 sample to use __seccomp_filter 2016-09-27 03:48:58 -04:00
tracex6_kern.c samples/bpf: add tests for more perf event types 2017-06-04 21:58:15 -04:00
tracex6_user.c samples/bpf: add tests for more perf event types 2017-06-04 21:58:15 -04:00
xdp1_kern.c bpf: make xdp sample variable names more meaningful 2016-07-20 22:07:24 -07:00
xdp1_user.c samples/bpf: run cleanup routines when receiving SIGTERM 2017-05-11 21:43:30 -04:00
xdp2_kern.c bpf: make xdp sample variable names more meaningful 2016-07-20 22:07:24 -07:00
xdp_tx_iptunnel_common.h bpf: xdp: Add XDP example for head adjustment 2016-12-08 14:25:13 -05:00
xdp_tx_iptunnel_kern.c bpf: fix samples xdp_tx_iptunnel and tc_l2_redirect with fake KBUILD_MODNAME 2017-01-20 12:04:07 -05:00
xdp_tx_iptunnel_user.c samples/bpf: run cleanup routines when receiving SIGTERM 2017-05-11 21:43:30 -04:00

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