netdev - Re: [PATCH net-next 2/2] selftests/net: integrate packetdrill with ksft

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Message-ID: <66da4ab570989_269be02944d@willemb.c.googlers.com.notmuch>
Date: Thu, 05 Sep 2024 20:20:05 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc: netdev@...r.kernel.org, 
 davem@...emloft.net, 
 edumazet@...gle.com, 
 pabeni@...hat.com, 
 ncardwell@...gle.com, 
 shuah@...nel.org, 
 linux-kselftest@...r.kernel.org, 
 fw@...len.de, 
 Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net-next 2/2] selftests/net: integrate packetdrill with
 ksft

Willem de Bruijn wrote:
> Jakub Kicinski wrote:
> > On Wed,  4 Sep 2024 23:07:03 -0400 Willem de Bruijn wrote:
> > > +++ b/tools/testing/selftests/net/packetdrill/config
> > > @@ -0,0 +1 @@
> > > +CONFIG_TCP_MD5SIG=y
> > 
> > Looks like this is not enough:
> > 
> > # 1..2
> > # open tun device: No such file or directory
> > # not ok 1 ipv4
> > # open tun device: No such file or directory
> > 
> > https://netdev-3.bots.linux.dev/vmksft-packetdrill/results/759141/1-tcp-inq-client-pkt/stdout
> > 
> > Resulting config in the build:
> > 
> > # CONFIG_TUN is not set
> > 
> > https://netdev-3.bots.linux.dev/vmksft-packetdrill/results/759141/config
> > 
> > Keep in mind the "Important" note here:
> > 
> > https://github.com/linux-netdev/nipa/wiki/How-to-run-netdev-selftests-CI-style#how-to-build
> > 
> > I recommend using a fresh tree or mrproper for testing vng configs.
> > 
> > Feel free to post v2 without the 24h wait, it's a bit tricky to handle
> > new targets in CI, sooner we merge this the less manual work for me..
> 
> Oops sorry. Thanks for the pointer.
> 
> Sent a v2 with CONFIG_TUN and a few other CONFIGS from reviewing
> the existing configs and defaults.sh. The above steps work for me now. 

Packetdrill scripts are sensitive to timing.
On the dbg build, I just observe a flaky test.

The tool takes --tolerance_usecs and --tolerance_percent arguments.
I may have to update ksft_runner.sh to increase one if a dbg build is
detected.

Let me know if I should respin now. Else I can also follow-up.

Need to figure out how best to detect debug builds. It is not in
uname, and no proc/config.gz. Existence of /sys/kernel/debug/kmemleak
is a proxy for current kernel/configs/debug.config, if a bit crude.

Another config affecting timing may be CONFIG_HZ. I did not observe
issues with these specific scripts with CONFIG_HZ=250. It may have to
be tackled eventually. Or CONFIG_HZ=1000 hardcoded in config.