selftests/bpf: Make tcp_rtt test more robust to failures

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Switch to non-blocking accept and wait for server thread to exit before
proceeding. I noticed that sometimes tcp_rtt server thread failure would
"spill over" into other tests (that would run after tcp_rtt), probably just
because server thread exits much later and tcp_rtt doesn't wait for it.

v1->v2:
  - add usleep() while waiting on initial non-blocking accept() (Stanislav);

Fixes: 8a03222f50 ("selftests/bpf: test_progs: fix client/server race in tcp_rtt")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/bpf/20200311222749.458015-1-andriin@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Andrii Nakryiko 2020-03-11 15:27:49 -07:00 • committed by Alexei Starovoitov

parent 2b5cf9fb74

commit 4cd729fa02

1 changed files with 20 additions and 12 deletions

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tools/testing/selftests/bpf/prog_tests/tcp_rtt.c

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