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self-tests: introduce self-tests for RPS default mask
Ensure that RPS default mask changes take place on all newly created netns/devices and don't affect existing ones. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Simon Horman <simon.horman@corigine.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Paolo Abeni
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Jakub Kicinski
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Feb 10, 2023
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Original file line number | Diff line number | Diff line change |
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#!/bin/sh | ||
# SPDX-License-Identifier: GPL-2.0 | ||
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readonly ksft_skip=4 | ||
readonly cpus=$(nproc) | ||
ret=0 | ||
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[ $cpus -gt 2 ] || exit $ksft_skip | ||
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readonly INITIAL_RPS_DEFAULT_MASK=$(cat /proc/sys/net/core/rps_default_mask) | ||
readonly NETNS="ns-$(mktemp -u XXXXXX)" | ||
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setup() { | ||
ip netns add "${NETNS}" | ||
ip -netns "${NETNS}" link set lo up | ||
} | ||
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cleanup() { | ||
echo $INITIAL_RPS_DEFAULT_MASK > /proc/sys/net/core/rps_default_mask | ||
ip netns del $NETNS | ||
} | ||
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chk_rps() { | ||
local rps_mask expected_rps_mask=$3 | ||
local dev_name=$2 | ||
local msg=$1 | ||
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rps_mask=$(ip netns exec $NETNS cat /sys/class/net/$dev_name/queues/rx-0/rps_cpus) | ||
printf "%-60s" "$msg" | ||
if [ $rps_mask -eq $expected_rps_mask ]; then | ||
echo "[ ok ]" | ||
else | ||
echo "[fail] expected $expected_rps_mask found $rps_mask" | ||
ret=1 | ||
fi | ||
} | ||
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trap cleanup EXIT | ||
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echo 0 > /proc/sys/net/core/rps_default_mask | ||
setup | ||
chk_rps "empty rps_default_mask" lo 0 | ||
cleanup | ||
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echo 1 > /proc/sys/net/core/rps_default_mask | ||
setup | ||
chk_rps "non zero rps_default_mask" lo 1 | ||
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echo 3 > /proc/sys/net/core/rps_default_mask | ||
chk_rps "changing rps_default_mask dont affect existing netns" lo 1 | ||
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ip -n $NETNS link add type veth | ||
ip -n $NETNS link set dev veth0 up | ||
ip -n $NETNS link set dev veth1 up | ||
chk_rps "changing rps_default_mask affect newly created devices" veth0 3 | ||
chk_rps "changing rps_default_mask affect newly created devices[II]" veth1 3 | ||
exit $ret |