netdev - Re: [bpf-next PATCH v2 00/12] bpf: selftests, test

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Date:   Sat, 16 May 2020 03:02:38 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     John Fastabend <john.fastabend@...il.com>, lmb@...udflare.com,
        jakub@...udflare.com
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, ast@...nel.org
Subject: Re: [bpf-next PATCH v2 00/12] bpf: selftests, test_sockmap
 improvements

On 5/13/20 9:12 PM, John Fastabend wrote:
> Note: requires fixes listed below to be merged into bpf-next before
>        applied.
> 
> Update test_sockmap to add ktls tests and in the process make output
> easier to understand and reduce overall runtime significantly. Before
> this series test_sockmap did a poor job of tracking sent bytes causing
> the recv thread to wait for a timeout even though all expected bytes
> had been received. Doing this many times causes significant delays.
> Further, we did many redundant tests because the send/recv test we used
> was not specific to the parameters we were testing. For example testing
> a failure case that always fails many times with different send sizes
> is mostly useless. If the test condition catches 10B in the kernel code
> testing 100B, 1kB, 4kB, and so on is just noise.
> 
> The main motivation for this is to add ktls tests, the last patch. Until
> now I have been running these locally but we haven't had them checked in
> to selftests. And finally I'm hoping to get these pushed into the libbpf
> test infrastructure so we can get more testing. For that to work we need
> ability to white and blacklist tests based on kernel features so we add
> that here as well.
> 
> The new output looks like this broken into test groups with subtest
> counters,
> 
>   $ time sudo ./test_sockmap
>   # 1/ 6  sockmap:txmsg test passthrough:OK
>   # 2/ 6  sockmap:txmsg test redirect:OK
>   ...
>   #22/ 1 sockhash:txmsg test push/pop data:OK
>   Pass: 22 Fail: 0
> 
>   real    0m9.790s
>   user    0m0.093s
>   sys     0m7.318s
> 
> The old output printed individual subtest and was rather noisy
> 
>   $ time sudo ./test_sockmap
>   [TEST 0]: (1, 1, 1, sendmsg, pass,): PASS
>   ...
>   [TEST 823]: (16, 1, 100, sendpage, ... ,pop (1599,1609),): PASS
>   Summary: 824 PASSED 0 FAILED
> 
>   real    0m56.761s
>   user    0m0.455s
>   sys     0m31.757s
> 
> So we are able to reduce time from ~56s to ~10s. To recover older more
> verbose output simply run with --verbose option. To whitelist and
> blacklist tests use the new --whitelist and --blacklist flags added. For
> example to run cork sockhash tests but only ones that don't have a receive
> hang (used to test negative cases) we could do,
> 
>   $ ./test_sockmap --whitelist="cork" --blacklist="sockmap,hang"
> 
> Requires these two fixes from net tree,
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=3e104c23816220919ea1b3fd93fabe363c67c484
> https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=81aabbb9fb7b4b1efd073b62f0505d3adad442f3
> 
> v1->v2: Addressed Jakub's comments, exit to _exit and strerror typo.
>          Added Jakubs Reviewed-by tag, Thanks!
> 
> ---
> 
> John Fastabend (12):
>        bpf: sockmap, msg_pop_data can incorrecty set an sge length
>        bpf: sockmap, bpf_tcp_ingress needs to subtract bytes from sg.size
>        bpf: selftests, move sockmap bpf prog header into progs
>        bpf: selftests, remove prints from sockmap tests
>        bpf: selftests, sockmap test prog run without setting cgroup
>        bpf: selftests, print error in test_sockmap error cases
>        bpf: selftests, improve test_sockmap total bytes counter
>        bpf: selftests, break down test_sockmap into subtests
>        bpf: selftests, provide verbose option for selftests execution
>        bpf: selftests, add whitelist option to test_sockmap
>        bpf: selftests, add blacklist to test_sockmap
>        bpf: selftests, add ktls tests to test_sockmap
> 
> 
>   .../selftests/bpf/progs/test_sockmap_kern.h        |  299 +++++++
>   tools/testing/selftests/bpf/test_sockmap.c         |  913 ++++++++++----------
>   tools/testing/selftests/bpf/test_sockmap_kern.h    |  451 ----------
>   3 files changed, 770 insertions(+), 893 deletions(-)
>   create mode 100644 tools/testing/selftests/bpf/progs/test_sockmap_kern.h
>   delete mode 100644 tools/testing/selftests/bpf/test_sockmap_kern.h

Applied 3-12, thanks!