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linux/tools/testing/selftests/bpf
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Song Liu c7568114bc selftests/bpf: Add bpf_iter test with bpf_get_task_stack() 
The new test is similar to other bpf_iter tests. It dumps all
/proc/<pid>/stack to a seq_file. Here is some example output:

pid:     2873 num_entries:        3
[<0>] worker_thread+0xc6/0x380
[<0>] kthread+0x135/0x150
[<0>] ret_from_fork+0x22/0x30

pid:     2874 num_entries:        9
[<0>] __bpf_get_stack+0x15e/0x250
[<0>] bpf_prog_22a400774977bb30_dump_task_stack+0x4a/0xb3c
[<0>] bpf_iter_run_prog+0x81/0x170
[<0>] __task_seq_show+0x58/0x80
[<0>] bpf_seq_read+0x1c3/0x3b0
[<0>] vfs_read+0x9e/0x170
[<0>] ksys_read+0xa7/0xe0
[<0>] do_syscall_64+0x4c/0xa0
[<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

Note: bpf_iter test as-is doesn't print the contents of the seq_file. To
see the example above, it is necessary to add printf() to do_dummy_read.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200630062846.664389-5-songliubraving@fb.com
2020-07-01 08:23:59 -07:00
..
benchs bpf: Add BPF ringbuf and perf buffer benchmarks 2020-06-01 14:38:22 -07:00
gnu
map_tests .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
prog_tests selftests/bpf: Add bpf_iter test with bpf_get_task_stack() 2020-07-01 08:23:59 -07:00
progs selftests/bpf: Add bpf_iter test with bpf_get_task_stack() 2020-07-01 08:23:59 -07:00
verifier selftests/bpf: Test access to bpf map pointer 2020-06-22 22:22:59 +02:00
.gitignore selftests/bpf: Add benchmark runner infrastructure 2020-05-13 12:19:38 -07:00
bench.c bpf: Add BPF ringbuf and perf buffer benchmarks 2020-06-01 14:38:22 -07:00
bench.h selftests/bpf: Add benchmark runner infrastructure 2020-05-13 12:19:38 -07:00
bpf_legacy.h selftests/bpf: samples/bpf: Split off legacy stuff from bpf_helpers.h 2019-10-08 23:16:03 +02:00
bpf_rand.h
bpf_rlimit.h
bpf_tcp_helpers.h libbpf: Merge selftests' bpf_trace_helpers.h into libbpf's bpf_tracing.h 2020-03-02 16:25:14 -08:00
bpf_util.h selftests: Use consistent include paths for libbpf 2020-01-20 16:37:45 -08:00
cgroup_helpers.c
cgroup_helpers.h
config selftests/bpf: CONFIG_LIRC required for test_lirc_mode2.sh 2020-05-23 01:12:31 +02:00
flow_dissector_load.c
flow_dissector_load.h
get_cgroup_id_user.c
Makefile selftests/bpf: Allow substituting custom vmlinux.h for selftests build 2020-06-30 15:50:11 -07:00
netcnt_common.h
network_helpers.c bpf, testing: Add get{peer, sock}name selftests to test_progs 2020-05-19 11:32:04 -07:00
network_helpers.h bpf, testing: Add get{peer, sock}name selftests to test_progs 2020-05-19 11:32:04 -07:00
README.rst selftests/bpf: Add general instructions for test execution 2020-05-23 01:11:09 +02:00
tcp_client.py
tcp_server.py
test_bpftool.py selftests/bpf: Add test for "bpftool feature" command 2020-02-26 18:34:34 +01:00
test_bpftool.sh selftests/bpf: Add test for "bpftool feature" command 2020-02-26 18:34:34 +01:00
test_bpftool_build.sh selftests, bpftool: Skip the build test if not in tree 2019-11-24 16:58:45 -08:00
test_btf.c selftests/bpf: Fix a couple of broken test_btf cases 2020-04-24 17:47:40 -07:00
test_btf.h
test_cgroup_storage.c
test_cpp.cpp selftests: Use consistent include paths for libbpf 2020-01-20 16:37:45 -08:00
test_current_pid_tgid_new_ns.c tools/testing/selftests/bpf: Add self-tests for new helper bpf_get_ns_current_pid_tgid. 2020-03-12 17:40:47 -07:00
test_dev_cgroup.c
test_flow_dissector.c
test_flow_dissector.sh selftests/bpf: Add test based on port range for BPF flow dissector 2020-01-27 11:25:07 +01:00
test_ftrace.sh selftests/bpf: Test function_graph tracer and bpf trampoline together 2019-12-11 15:19:29 -08:00
test_iptunnel_common.h
test_kmod.sh
test_lirc_mode2.sh
test_lirc_mode2_user.c
test_lpm_map.c
test_lru_map.c
test_lwt_ip_encap.sh selftests/bpf: More compatible nc options in test_lwt_ip_encap 2019-10-08 23:59:22 +02:00
test_lwt_seg6local.sh
test_maps.c selftests/bpf: Add tests for write-only stacks/queues 2020-06-01 14:38:22 -07:00
test_maps.h
test_netcnt.c
test_offload.py selftests: bpf: log direct file writes 2019-11-06 09:59:58 -08:00
test_progs.c selftests/bpf: Extract parse_num_list into generic testing_helpers.c 2020-05-13 12:19:38 -07:00
test_progs.h selftests/bpf: Extract parse_num_list into generic testing_helpers.c 2020-05-13 12:19:38 -07:00
test_select_reuseport_common.h
test_skb_cgroup_id.sh
test_skb_cgroup_id_user.c selftests/bpf: Don't hard-code root cgroup id 2019-12-04 17:56:22 -08:00
test_sock.c selftests: Use consistent include paths for libbpf 2020-01-20 16:37:45 -08:00
test_sock_addr.c selftests/bpf: Test narrow loads for bpf_sock_addr.user_port 2020-05-14 18:30:57 -07:00
test_sock_addr.sh
test_sock_fields.c
test_socket_cookie.c
test_sockmap.c bpf, selftests: Add test for ktls with skb bpf ingress policy 2020-06-01 14:48:32 -07:00
test_stub.c selftests/bpf: Integrate verbose verifier log into test_progs 2019-11-24 16:58:45 -08:00
test_sysctl.c selftests: Use consistent include paths for libbpf 2020-01-20 16:37:45 -08:00
test_tag.c
test_tc_edt.sh selftests/bpf: More compatible nc options in test_tc_edt 2019-10-18 22:33:57 +02:00
test_tc_tunnel.sh selftests, bpf: Fix test_tc_tunnel hanging 2019-11-18 21:31:49 +01:00
test_tcp_check_syncookie.sh
test_tcp_check_syncookie_user.c
test_tcpbpf.h selftests/bpf: De-flake test_tcpbpf 2019-12-04 18:01:05 -08:00
test_tcpbpf_user.c selftests/bpf: De-flake test_tcpbpf 2019-12-04 18:01:05 -08:00
test_tcpnotify.h
test_tcpnotify_user.c
test_tunnel.sh
test_verifier.c selftests/bpf: Use CAP_BPF and CAP_PERFMON in tests 2020-05-15 17:29:41 +02:00
test_verifier_log.c
test_xdp_meta.sh
test_xdp_redirect.sh
test_xdp_veth.sh
test_xdp_vlan.sh
test_xdp_vlan_mode_generic.sh
test_xdp_vlan_mode_native.sh
test_xdping.sh
testing_helpers.c selftests/bpf: Extract parse_num_list into generic testing_helpers.c 2020-05-13 12:19:38 -07:00
testing_helpers.h selftests/bpf: Extract parse_num_list into generic testing_helpers.c 2020-05-13 12:19:38 -07:00
trace_helpers.c samples, bpf: Move read_trace_pipe to trace_helpers 2020-03-23 22:27:51 +01:00
trace_helpers.h samples, bpf: Move read_trace_pipe to trace_helpers 2020-03-23 22:27:51 +01:00
urandom_read.c
with_addr.sh
with_tunnels.sh
xdping.c selftests: bpf: correct perror strings 2019-11-28 22:40:30 -08:00
xdping.h

README.rst 

==================
BPF Selftest Notes
==================
General instructions on running selftests can be found in
`Documentation/bpf/bpf_devel_QA.rst`_.

Additional information about selftest failures are
documented here.

bpf_iter test failures with clang/llvm 10.0.0
=============================================

With clang/llvm 10.0.0, the following two bpf_iter tests failed:
  * ``bpf_iter/ipv6_route``
  * ``bpf_iter/netlink``

The symptom for ``bpf_iter/ipv6_route`` looks like

.. code-block:: c

  2: (79) r8 = *(u64 *)(r1 +8)
  ...
  14: (bf) r2 = r8
  15: (0f) r2 += r1
  ; BPF_SEQ_PRINTF(seq, "%pi6 %02x ", &rt->fib6_dst.addr, rt->fib6_dst.plen);
  16: (7b) *(u64 *)(r8 +64) = r2
  only read is supported

The symptom for ``bpf_iter/netlink`` looks like

.. code-block:: c

  ; struct netlink_sock *nlk = ctx->sk;
  2: (79) r7 = *(u64 *)(r1 +8)
  ...
  15: (bf) r2 = r7
  16: (0f) r2 += r1
  ; BPF_SEQ_PRINTF(seq, "%pK %-3d ", s, s->sk_protocol);
  17: (7b) *(u64 *)(r7 +0) = r2
  only read is supported

This is due to a llvm BPF backend bug. The fix 
  https://reviews.llvm.org/D78466
has been pushed to llvm 10.x release branch and will be
available in 10.0.1. The fix is available in llvm 11.0.0 trunk.