linux/samples/bpf
David S. Miller c2eb6d07a6 Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf
Daniel Borkmann says:

====================
pull-request: bpf 2017-12-02

The following pull-request contains BPF updates for your *net* tree.

The main changes are:

1) Fix a compilation warning in xdp redirect tracepoint due to
   missing bpf.h include that pulls in struct bpf_map, from Xie.

2) Limit the maximum number of attachable BPF progs for a given
   perf event as long as uabi is not frozen yet. The hard upper
   limit is now 64 and therefore the same as with BPF multi-prog
   for cgroups. Also add related error checking for the sample
   BPF loader when enabling and attaching to the perf event, from
   Yonghong.

3) Specifically set the RLIMIT_MEMLOCK for the test_verifier_log
   case, so that the test case can always pass and not fail in
   some environments due to too low default limit, also from
   Yonghong.

4) Fix up a missing license header comment for kernel/bpf/offload.c,
   from Jakub.

5) Several fixes for bpftool, among others a crash on incorrect
   arguments when json output is used, error message handling
   fixes on unknown options and proper destruction of json writer
   for some exit cases, all from Quentin.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2017-12-03 13:08:30 -05:00
..
Makefile kbuild: remove all dummy assignments to obj- 2017-11-18 11:46:06 +09:00
README.rst samples/bpf: Add documentation on cross compilation 2017-09-21 11:59:16 -07:00
bpf_load.c samples/bpf: add error checking for perf ioctl calls in bpf loader 2017-12-01 02:59:21 +01:00
bpf_load.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
map_perf_test_kern.c samples/bpf: Use getppid instead of getpgrp for array map stress 2017-09-21 11:59:16 -07:00
map_perf_test_user.c bpf: libbpf: Provide basic API support to specify BPF obj name 2017-09-29 06:17:05 +01:00
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
run_cookie_uid_helper_example.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sock_flags_kern.c samples/bpf: Update cgroup socket examples to use uid gid helper 2017-09-01 06:05:15 +01:00
sockex1_kern.c samples: bpf: add skb->field examples and tests 2015-03-15 22:02:28 -04:00
sockex1_user.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sockex2_kern.c samples/bpf: fix sockex2 example 2016-11-24 16:04:52 -05:00
sockex2_user.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sockex3_kern.c bpf samples: fix compiler errors with sockex2 and sockex3 2016-09-27 03:48:58 -04:00
sockex3_user.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
spintest_kern.c samples/bpf: Enable powerpc support 2016-04-06 16:01:29 -04:00
spintest_user.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
syscall_nrs.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
syscall_tp_kern.c bpf: add a test case for syscalls/sys_{enter|exit}_* tracepoints 2017-08-07 14:09:48 -07:00
syscall_tp_user.c bpf: add a test case to test single tp multiple bpf attachment 2017-10-25 10:47:47 +09:00
tc_l2_redirect.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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
tcbpf1_kern.c bpf: fix samples to add fake KBUILD_MODNAME 2016-10-29 14:46:12 -04:00
tcbpf2_kern.c samples/bpf: extend test_tunnel_bpf.sh with ERSPAN 2017-08-28 15:04:52 -07:00
tcp_basertt_kern.c bpf: sample BPF_SOCKET_OPS_BASE_RTT program 2017-10-22 03:12:05 +01:00
tcp_bpf.readme bpf: Rename tcp_bbf.readme to tcp_bpf.readme 2017-11-08 12:13:41 +09:00
tcp_bufs_kern.c bpf: Fix tcp_bufs_kern.c sample program 2017-11-11 15:52:41 +09:00
tcp_clamp_kern.c bpf: Fix tcp_clamp_kern.c sample program 2017-11-11 15:52:41 +09:00
tcp_cong_kern.c bpf: Fix tcp_cong_kern.c sample program 2017-11-11 15:52:41 +09:00
tcp_iw_kern.c bpf: Fix tcp_iw_kern.c sample program 2017-11-11 15:52:41 +09:00
tcp_rwnd_kern.c bpf: Fix tcp_rwnd_kern.c sample program 2017-11-11 15:52:41 +09:00
tcp_synrto_kern.c bpf: Fix tcp_synrto_kern.c sample program 2017-11-11 15:52:41 +09:00
test_cgrp2_array_pin.c samples/bpf: Make samples more libbpf-centric 2016-12-15 16:25:47 -03:00
test_cgrp2_attach.c bpf: introduce BPF_F_ALLOW_OVERRIDE flag 2017-02-12 21:52:19 -05:00
test_cgrp2_attach2.c samples/bpf: use bpf_prog_query() interface 2017-10-04 16:05:06 -07:00
test_cgrp2_sock.c samples/bpf: Update cgroup socket examples to use uid gid helper 2017-09-01 06:05:15 +01:00
test_cgrp2_sock.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
test_cgrp2_sock2.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
test_cgrp2_sock2.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
test_cgrp2_tc.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
test_cgrp2_tc_kern.c bpf: fix samples to add fake KBUILD_MODNAME 2016-10-29 14:46:12 -04:00
test_cls_bpf.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
test_tunnel_bpf.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace_event_kern.c bpf: add a test case for helper bpf_perf_prog_read_value 2017-10-07 23:05:57 +01:00
trace_event_user.c bpf: add a test case for helper bpf_perf_prog_read_value 2017-10-07 23:05:57 +01:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tracex2_kern.c bpf, samples: don't zero data when not needed 2016-04-14 21:40:42 -04:00
tracex2_user.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tracex6_kern.c bpf: add a test case for helper bpf_perf_event_read_value 2017-10-07 23:05:57 +01:00
tracex6_user.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-11-04 09:26:51 +09:00
xdp1_kern.c bpf: make xdp sample variable names more meaningful 2016-07-20 22:07:24 -07:00
xdp1_user.c samples/bpf: adjust rlimit RLIMIT_MEMLOCK for xdp1 2017-10-29 12:17:13 +09:00
xdp2_kern.c bpf: make xdp sample variable names more meaningful 2016-07-20 22:07:24 -07:00
xdp_monitor_kern.c samples/bpf: xdp_monitor also record xdp_exception tracepoint 2017-10-06 10:04:35 -07:00
xdp_monitor_user.c samples/bpf: xdp_monitor increase memory rlimit 2017-10-06 10:04:36 -07:00
xdp_redirect_cpu_kern.c samples/bpf: add cpumap sample program xdp_redirect_cpu 2017-10-18 12:12:18 +01:00
xdp_redirect_cpu_user.c samples/bpf: add cpumap sample program xdp_redirect_cpu 2017-10-18 12:12:18 +01:00
xdp_redirect_kern.c samples/bpf: Fix compilation issue in redirect dummy program 2017-08-31 11:56:57 -07:00
xdp_redirect_map_kern.c samples/bpf: Fix compilation issue in redirect dummy program 2017-08-31 11:56:57 -07:00
xdp_redirect_map_user.c samples/bpf: adjust rlimit RLIMIT_MEMLOCK for xdp_redirect_map 2017-10-29 12:17:32 +09:00
xdp_redirect_user.c samples/bpf: xdp_redirect load XDP dummy prog on TX device 2017-08-29 10:51:29 -07:00
xdp_router_ipv4_kern.c xdp: Sample xdp program implementing ip forward 2017-11-08 10:39:41 +09:00
xdp_router_ipv4_user.c xdp: sample: Missing curly braces in read_route() 2017-11-14 22:00:13 +09:00
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

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