linux-kernel - Re: [PATCH net-next v3 6/7] selftests: net: Add busy_poll

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Message-ID: <20241101063426.2e1423a8@kernel.org>
Date: Fri, 1 Nov 2024 06:34:26 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Joe Damato <jdamato@...tly.com>
Cc: netdev@...r.kernel.org, pabeni@...hat.com, namangulati@...gle.com,
 edumazet@...gle.com, amritha.nambiar@...el.com,
 sridhar.samudrala@...el.com, sdf@...ichev.me, peter@...eblog.net,
 m2shafiei@...terloo.ca, bjorn@...osinc.com, hch@...radead.org,
 willy@...radead.org, willemdebruijn.kernel@...il.com, skhawaja@...gle.com,
 Martin Karsten <mkarsten@...terloo.ca>, "David S. Miller"
 <davem@...emloft.net>, Simon Horman <horms@...nel.org>, Shuah Khan
 <shuah@...nel.org>, linux-kernel@...r.kernel.org (open list),
 linux-kselftest@...r.kernel.org (open list:KERNEL SELFTEST FRAMEWORK)
Subject: Re: [PATCH net-next v3 6/7] selftests: net: Add busy_poll_test

On Fri,  1 Nov 2024 00:48:33 +0000 Joe Damato wrote:
> +	ip netns exec nscl nc -N 192.168.1.1 48675 < $tmp_file

Thanks a lot for adding the test. Could you replace nc with socat or
a similar tool? There are multiple incompatible implementations of
netcat packaged by various distros, we get:

# selftests: net: busy_poll_test.sh
# nc: invalid option -- 'N'
# Ncat: Try `--help' or man(1) ncat for more information, usage options and help. QUITTING.

nc is a known PITA.

> +	# set the suspend parameter for the server via its IFIDX
> +
> +	DUMP_CMD="${YNL_PATH} --spec ${SPEC_PATH} --dump napi-get --json=\"{\\\"ifindex\\\": ${NSIM_DEV_1_IFIDX}}\" --output-json"
> +	NSIM_DEV_1_NAPIID=$(ip netns exec nssv bash -c "$DUMP_CMD")
> +	NSIM_DEV_1_NAPIID=$(echo $NSIM_DEV_1_NAPIID | jq '.[] | .id')
> +
> +	SUSPEND_CMD="${YNL_PATH} --spec ${SPEC_PATH} --do napi-set --json=\"{\\\"id\\\": ${NSIM_DEV_1_NAPIID}, \\\"irq-suspend-timeout\\\": 20000000, \\\"gro-flush-timeout\\\": 50000, \\\"defer-hard-irqs\\\": 100}\""
> +	NSIM_DEV_1_SETCONFIG=$(ip netns exec nssv bash -c "$SUSPEND_CMD")

Can you try to run this test in installed mode?

https://docs.kernel.org/dev-tools/kselftest.html#install-selftests

IIRC YNL moves around when we install, you'd either need to do
autodetection of the path (see tools/testing/selftests/net/lib/py/ynl.py
and if you go down this route please move the helper which exports the
YNL variables to lib.sh so other tests can reuse); or teach the C code
to do the setup, you can link against YNL fairly easily (look at where
ncdevmem is added in the Makefile, it uses YNL)