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99aaf53e2f7c4a1b152b7f300c6b07ffbc2fe192
android_kernel_xiaomi_sm8450/tools/testing/selftests/bpf
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Yonghong Song 99aaf53e2f tools/bpf: selftests : Explain bpf_iter test failures with llvm 10.0.0 
Commit 6879c042e1 ("tools/bpf: selftests: Add bpf_iter selftests")
added self tests for bpf_iter feature. But two subtests
ipv6_route and netlink needs llvm latest 10.x release branch
or trunk due to a bug in llvm BPF backend. This patch added
the file README.rst to document these two failures
so people using llvm 10.0.0 can be aware of them.

Suggested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200513180215.2949237-1-yhs@fb.com
2020-05-13 12:30:49 -07:00
..
benchs
selftest/bpf: Add BPF triggering benchmark
2020-05-13 12:19:38 -07:00
gnu
selftests/bpf: get rid of -D__x86_64__
2017-05-03 09:51:25 -04:00
map_tests
.gitignore: add SPDX License Identifier
2020-03-25 11:50:48 +01:00
prog_tests
selftest/bpf: Fmod_ret prog and implement test_overhead as part of bench
2020-05-13 12:19:38 -07:00
progs
selftest/bpf: Add BPF triggering benchmark
2020-05-13 12:19:38 -07:00
verifier
selftests/bpf: Test allowed maps for bpf_sk_select_reuseport
2020-04-30 16:21:14 +02:00
.gitignore
selftests/bpf: Add benchmark runner infrastructure
2020-05-13 12:19:38 -07:00
bench.c
selftest/bpf: Add BPF triggering benchmark
2020-05-13 12:19:38 -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: add ld64 imm test cases
2018-05-14 19:11:45 -07:00
bpf_rlimit.h
bpf: unify rlimit handling in selftests
2018-02-26 20:11:23 -08:00
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
selftests/bpf: Correct path to include msg + path
2019-10-03 17:21:57 +02:00
cgroup_helpers.h
selftests/bpf: Fix const'ness in cgroup_helpers
2018-07-15 00:08:41 +02:00
config
selftests/bpf: Use reno instead of dctcp
2020-05-01 16:51:07 -07:00
flow_dissector_load.c
selftests/bpf: run flow dissector tests in skb-less mode
2019-04-23 18:36:34 +02:00
flow_dissector_load.h
selftests/bpf: properly return error from bpf_flow_load
2019-04-23 18:36:34 +02:00
get_cgroup_id_user.c
tools/bpf: fix selftest get_cgroup_id_user
2018-06-08 00:10:07 +02:00
Makefile
selftest/bpf: Add BPF triggering benchmark
2020-05-13 12:19:38 -07:00
netcnt_common.h
selftests/bpf: cgroup local storage-based network counters
2018-10-01 16:18:33 +02:00
network_helpers.c
selftests/bpf: Move existing common networking parts into network_helpers
2020-05-09 00:48:20 +02:00
network_helpers.h
selftests/bpf: Move existing common networking parts into network_helpers
2020-05-09 00:48:20 +02:00
README.rst
tools/bpf: selftests : Explain bpf_iter test failures with llvm 10.0.0
2020-05-13 12:30:49 -07:00
tcp_client.py
selftests/bpf: use localhost in tcp_{server,client}.py
2019-02-04 21:29:27 +01:00
tcp_server.py
selftests/bpf: use localhost in tcp_{server,client}.py
2019-02-04 21:29:27 +01:00
test_align.c
selftests/bpf: fix test_align liveliness expectations
2019-07-06 00:16:56 +02:00
test_bpftool_build.sh
selftests, bpftool: Skip the build test if not in tree
2019-11-24 16:58:45 -08:00
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_btf.c
selftests/bpf: Fix a couple of broken test_btf cases
2020-04-24 17:47:40 -07:00
test_btf.h
bpf: Refactor BTF encoding macro to test_btf.h
2019-04-27 09:07:05 -07:00
test_cgroup_storage.c
selftests/bpf: fix test_cgroup_storage on s390
2019-08-21 16:55:01 +02:00
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
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206
2019-05-30 11:29:53 -07:00
test_flow_dissector.c
selftests: bpf: remove duplicated include
2019-01-29 00:09:26 +01:00
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
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206
2019-05-30 11:29:53 -07:00
test_kmod.sh
selftests: bpf: notification about privilege required to run test_kmod.sh testing script
2018-06-22 00:30:02 +02:00
test_lirc_mode2_user.c
media: bpf: add bpf function to report mouse movement
2018-12-09 14:37:18 -08:00
test_lirc_mode2.sh
media: bpf: add bpf function to report mouse movement
2018-12-09 14:37:18 -08:00
test_lpm_map.c
bpf: lpm_trie: check left child of last leftmost node for NULL
2019-06-11 13:52:37 +02:00
test_lru_map.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206
2019-05-30 11:29:53 -07:00
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
selftests/bpf: update test_lwt_seg6local.sh according to iproute2
2018-08-03 10:19:33 +02:00
test_maps.c
bpf, sockmap: Allow inserting listening TCP sockets into sockmap
2020-02-21 22:29:45 +01:00
test_maps.h
bpf: Add BPF_MAP_TYPE_SK_STORAGE test to test_maps
2019-04-27 09:07:05 -07:00
test_netcnt.c
selftests/bpf: fix incorrect users of create_and_get_cgroup
2019-01-07 13:15:55 -08:00
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
bpf: Test BPF_PROG_TYPE_SK_REUSEPORT
2018-08-11 01:58:46 +02:00
test_skb_cgroup_id_user.c
selftests/bpf: Don't hard-code root cgroup id
2019-12-04 17:56:22 -08:00
test_skb_cgroup_id.sh
kselftests/bpf: use ping6 as the default ipv6 ping binary if it exists
2018-10-31 23:05:30 +01:00
test_sock_addr.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2019-06-17 20:20:36 -07:00
test_sock_addr.sh
kselftests/bpf: use ping6 as the default ipv6 ping binary if it exists
2018-10-31 23:05:30 +01:00
test_sock_fields.c
selftests: bpf: enable hi32 randomization for all tests
2019-05-24 18:58:37 -07:00
test_sock.c
selftests: Use consistent include paths for libbpf
2020-01-20 16:37:45 -08:00
test_socket_cookie.c
selftests/bpf: convert socket_cookie test to sk storage
2019-06-15 01:21:59 +02:00
test_sockmap_kern.h
selftests: Use consistent include paths for libbpf
2020-01-20 16:37:45 -08:00
test_sockmap.c
selftests: bpf: Use a temporary file in test_sockmap
2020-01-24 22:12:13 +01:00
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
bpf: unify rlimit handling in selftests
2018-02-26 20:11:23 -08:00
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_user.c
selftests/bpf: add test for bpf_tcp_gen_syncookie
2019-07-30 21:03:05 -07:00
test_tcp_check_syncookie.sh
selftests/bpf: add test for bpf_tcp_gen_syncookie
2019-07-30 21:03:05 -07:00
test_tcpbpf_user.c
selftests/bpf: De-flake test_tcpbpf
2019-12-04 18:01:05 -08:00
test_tcpbpf.h
selftests/bpf: De-flake test_tcpbpf
2019-12-04 18:01:05 -08:00
test_tcpnotify_user.c
selftests/bpf: switch test_tcpnotify to perf_buffer API
2019-07-23 16:05:42 -07:00
test_tcpnotify.h
selftests/bpf: add a test case for sock_ops perf-event notification
2018-11-09 09:40:17 +01:00
test_tunnel.sh
selftests/bpf: fail test_tunnel.sh if subtests fail
2019-05-28 11:08:57 +02:00
test_verifier_log.c
bpf: unify rlimit handling in selftests
2018-02-26 20:11:23 -08:00
test_verifier.c
selftests/bpf: Test allowed maps for bpf_sk_select_reuseport
2020-04-30 16:21:14 +02:00
test_xdp_meta.sh
tools/bpf: fix batch-mode test failure of test_xdp_redirect.sh
2018-02-06 11:34:42 +01:00
test_xdp_redirect.sh
tools/bpf: fix batch-mode test failure of test_xdp_redirect.sh
2018-02-06 11:34:42 +01:00
test_xdp_veth.sh
selftests, bpf: Add test for veth native XDP
2019-06-24 18:18:30 -07:00
test_xdp_vlan_mode_generic.sh
selftests/bpf: add wrapper scripts for test_xdp_vlan.sh
2019-08-05 11:17:40 -07:00
test_xdp_vlan_mode_native.sh
selftests/bpf: add wrapper scripts for test_xdp_vlan.sh
2019-08-05 11:17:40 -07:00
test_xdp_vlan.sh
selftests/bpf: reduce time to execute test_xdp_vlan.sh
2019-08-05 11:17:40 -07:00
test_xdping.sh
selftests/bpf: measure RTT from xdp using xdping
2019-05-31 19:53:45 -07:00
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
selftests: bpf: modify urandom_read and link it non-statically
2019-03-21 19:37:30 -07:00
with_addr.sh
selftests/bpf: test bpf flow dissection
2018-09-14 12:04:33 -07:00
with_tunnels.sh
selftests/bpf: test bpf flow dissection
2018-09-14 12:04:33 -07:00
xdping.c
selftests: bpf: correct perror strings
2019-11-28 22:40:30 -08:00
xdping.h
selftests/bpf: measure RTT from xdp using xdping
2019-05-31 19:53:45 -07:00

README.rst 

==================
BPF Selftest Notes
==================

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.
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