selftests/bpf: Propagate errors during setup for reuseport tests
Prepare for switching reuseport tests to test_progs framework, where we
don't have the luxury to terminate the process on failure.
Modify setup helpers to signal failure via the return value with the help
of a macro similar to the one currently in use by the tests.
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191212102259.418536-8-jakub@cloudflare.com
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