Re: [PATCH bpf-next v11 2/5] selftests/bpf: Use random netns name for mptcp

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On 8/6/23 11:40 PM, Geliang Tang wrote:
On Fri, Aug 04, 2023 at 05:23:32PM -0700, Martin KaFai Lau wrote:
On 8/3/23 10:07 PM, Geliang Tang wrote:
Use rand() to generate a random netns name instead of using the fixed
name "mptcp_ns" for every test.

By doing that, we can re-launch the test even if there was an issue
removing the previous netns or if by accident, a netns with this generic
name already existed on the system.

Note that using a different name each will also help adding more
subtests in future commits.

Hi Martin,

I tried to run mptcp tests simultaneously, and got "Cannot create
namespace file "/var/run/netns/mptcp_ns": File exists" errors sometimes.
So I add this patch to fix it.

It's easy to reproduce, just run this commands in multiple terminals:
  > for i in `seq 1 100`; do sudo ./test_progs -t mptcp; done

Not only the "-t mptcp" test. Other tests in test_progs also don't support running parallel in multiple terminals. Does it really help to test the bpf part of the prog_tests/mptcp.c test by running like this? If it wants to exercise the other mptcp networking specific code like this, a separate mptcp test is needed outside of test_progs and it won't be run in the bpf CI.

If you agree, can you please avoid introducing unnecessary randomness to the test_progs where bpf CI and most users don't run in this way?

Also, please don't resend the patches too fast until the discussion is concluded. Please give reasonable time for others to reply.

I have a high level question. In LPC 2022 (https://lpc.events/event/16/contributions/1354/), I recall there was idea in using bpf to make other mptcp decision/policy. Any thought and progress on this? This set which only uses bpf to change the protocol feels like an incomplete solution.





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