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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
readonly ksft_skip=4
readonly cpus=$(nproc)
ret=0
[ $cpus -gt 2 ] || exit $ksft_skip
readonly INITIAL_RPS_DEFAULT_MASK=$(cat /proc/sys/net/core/rps_default_mask)
readonly TAG="$(mktemp -u XXXXXX)"
readonly VETH="veth${TAG}"
readonly NETNS="ns-${TAG}"
setup() {
ip netns add "${NETNS}"
ip -netns "${NETNS}" link set lo up
}
cleanup() {
echo $INITIAL_RPS_DEFAULT_MASK > /proc/sys/net/core/rps_default_mask
ip netns del $NETNS
}
chk_rps() {
local rps_mask expected_rps_mask=$4
local dev_name=$3
local netns=$2
local cmd="cat"
local msg=$1
[ -n "$netns" ] && cmd="ip netns exec $netns $cmd"
rps_mask=$($cmd /sys/class/net/$dev_name/queues/rx-0/rps_cpus)
printf "%-60s" "$msg"
# In case there is more than 32 CPUs we need to remove commas from masks
rps_mask=${rps_mask//,}
expected_rps_mask=${expected_rps_mask//,}
if [ $rps_mask -eq $expected_rps_mask ]; then
echo "[ ok ]"
else
echo "[fail] expected $expected_rps_mask found $rps_mask"
ret=1
fi
}
trap cleanup EXIT
echo 0 > /proc/sys/net/core/rps_default_mask
setup
chk_rps "empty rps_default_mask" $NETNS lo 0
cleanup
echo 1 > /proc/sys/net/core/rps_default_mask
setup
chk_rps "changing rps_default_mask dont affect existing devices" "" lo $INITIAL_RPS_DEFAULT_MASK
echo 3 > /proc/sys/net/core/rps_default_mask
chk_rps "changing rps_default_mask dont affect existing netns" $NETNS lo 0
ip link add name $VETH type veth peer netns $NETNS name $VETH
ip link set dev $VETH up
ip -n $NETNS link set dev $VETH up
chk_rps "changing rps_default_mask affect newly created devices" "" $VETH 3
chk_rps "changing rps_default_mask don't affect newly child netns[II]" $NETNS $VETH 0
ip link del dev $VETH
ip netns del $NETNS
setup
chk_rps "rps_default_mask is 0 by default in child netns" "$NETNS" lo 0
ip netns exec $NETNS sysctl -qw net.core.rps_default_mask=1
ip link add name $VETH type veth peer netns $NETNS name $VETH
chk_rps "changing rps_default_mask in child ns don't affect the main one" "" lo $INITIAL_RPS_DEFAULT_MASK
chk_rps "changing rps_default_mask in child ns affects new childns devices" $NETNS $VETH 1
chk_rps "changing rps_default_mask in child ns don't affect existing devices" $NETNS lo 0
exit $ret
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