selftests/bpf: Prevent client connect before server bind in test_tc_tunnel.sh

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[ Upstream commit f803bcf920 ]

In some systems, the netcat server can incur in delay to start listening.
When this happens, the test can randomly fail in various points.
This is an example error message:

   # ip gre none gso
   # encap 192.168.1.1 to 192.168.1.2, type gre, mac none len 2000
   # test basic connectivity
   # Ncat: Connection refused.

The issue stems from a race condition between the netcat client and server.
The test author had addressed this problem by implementing a sleep, which
I have removed in this patch.
This patch introduces a function capable of sleeping for up to two seconds.
However, it can terminate the waiting period early if the port is reported
to be listening.

Signed-off-by: Alessandro Carminati (Red Hat) <alessandro.carminati@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240314105911.213411-1-alessandro.carminati@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Alessandro Carminati (Red Hat) 2024-03-14 10:59:11 +00:00 • committed by Greg Kroah-Hartman

parent 3220c90f4d

commit f4258833ff

1 changed files with 12 additions and 1 deletions

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tools/testing/selftests/bpf/test_tc_tunnel.sh

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