selftests/bpf: Make seen_tc* variable tests more robust

Martin reported that on his local dev machine the test_tc_chain_mixed() fails as
"test_tc_chain_mixed:FAIL:seen_tc5 unexpected seen_tc5: actua

selftests/bpf: Make seen_tc* variable tests more robust

Martin reported that on his local dev machine the test_tc_chain_mixed() fails as
"test_tc_chain_mixed:FAIL:seen_tc5 unexpected seen_tc5: actual 1 != expected 0"
and others occasionally, too.

However, when running in a more isolated setup (qemu in particular), it works fine
for him. The reason is that there is a small race-window where seen_tc* could turn
into true for various test cases when there is background traffic, e.g. after the
asserts they often get reset. In such case when subsequent detach takes place,
unrelated background traffic could have already flipped the bool to true beforehand.

Add a small helper tc_skel_reset_all_seen() to reset all bools before we do the ping
test. At this point, everything is set up as expected and therefore no race can occur.
All tc_{opts,links} tests continue to pass after this change.

Reported-by: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20231006220655.1653-7-daniel@iogearbox.net
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

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selftests/bpf: Adapt assert_mprog_count to always expect 0 count

Simplify __assert_mprog_count() to remove the -ENOENT corner case as the
bpf_prog_query() now returns 0 when no bpf_mprog is attached

selftests/bpf: Adapt assert_mprog_count to always expect 0 count

Simplify __assert_mprog_count() to remove the -ENOENT corner case as the
bpf_prog_query() now returns 0 when no bpf_mprog is attached. This also
allows to convert a few test cases from using raw __assert_mprog_count()
over to plain assert_mprog_count() helper.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20231006220655.1653-5-daniel@iogearbox.net
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

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selftests/bpf: Add various more tcx test cases

Add several new tcx test cases to improve test coverage. This also includes
a few new tests with ingress instead of clsact qdisc, to cover the fix from

selftests/bpf: Add various more tcx test cases

Add several new tcx test cases to improve test coverage. This also includes
a few new tests with ingress instead of clsact qdisc, to cover the fix from
commit dc644b540a2d ("tcx: Fix splat in ingress_destroy upon tcx_entry_free").

# ./test_progs -t tc
[...]
#234 tc_links_after:OK
#235 tc_links_append:OK
#236 tc_links_basic:OK
#237 tc_links_before:OK
#238 tc_links_chain_classic:OK
#239 tc_links_chain_mixed:OK
#240 tc_links_dev_cleanup:OK
#241 tc_links_dev_mixed:OK
#242 tc_links_ingress:OK
#243 tc_links_invalid:OK
#244 tc_links_prepend:OK
#245 tc_links_replace:OK
#246 tc_links_revision:OK
#247 tc_opts_after:OK
#248 tc_opts_append:OK
#249 tc_opts_basic:OK
#250 tc_opts_before:OK
#251 tc_opts_chain_classic:OK
#252 tc_opts_chain_mixed:OK
#253 tc_opts_delete_empty:OK
#254 tc_opts_demixed:OK
#255 tc_opts_detach:OK
#256 tc_opts_detach_after:OK
#257 tc_opts_detach_before:OK
#258 tc_opts_dev_cleanup:OK
#259 tc_opts_invalid:OK
#260 tc_opts_mixed:OK
#261 tc_opts_prepend:OK
#262 tc_opts_replace:OK
#263 tc_opts_revision:OK
[...]
Summary: 44/38 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/8699efc284b75ccdc51ddf7062fa2370330dc6c0.1692029283.git.daniel@iogearbox.net
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

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selftests/bpf: Add mprog API tests for BPF tcx links

Add a big batch of test coverage to assert all aspects of the tcx link API:

# ./vmtest.sh -- ./test_progs -t tc_links
[...]
#225 tc_li

selftests/bpf: Add mprog API tests for BPF tcx links

Add a big batch of test coverage to assert all aspects of the tcx link API:

# ./vmtest.sh -- ./test_progs -t tc_links
[...]
#225 tc_links_after:OK
#226 tc_links_append:OK
#227 tc_links_basic:OK
#228 tc_links_before:OK
#229 tc_links_chain_classic:OK
#230 tc_links_dev_cleanup:OK
#231 tc_links_invalid:OK
#232 tc_links_prepend:OK
#233 tc_links_replace:OK
#234 tc_links_revision:OK
Summary: 10/0 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20230719140858.13224-9-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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