name : rps_default_mask.sh #!/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