1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3 4readonly ksft_skip=4 5readonly cpus=$(nproc) 6ret=0 7 8[ $cpus -gt 2 ] || exit $ksft_skip 9 10readonly INITIAL_RPS_DEFAULT_MASK=$(cat /proc/sys/net/core/rps_default_mask) 11readonly TAG="$(mktemp -u XXXXXX)" 12readonly VETH="veth${TAG}" 13readonly NETNS="ns-${TAG}" 14 15setup() { 16 ip netns add "${NETNS}" 17 ip -netns "${NETNS}" link set lo up 18} 19 20cleanup() { 21 echo $INITIAL_RPS_DEFAULT_MASK > /proc/sys/net/core/rps_default_mask 22 ip netns del $NETNS 23} 24 25chk_rps() { 26 local rps_mask expected_rps_mask=$4 27 local dev_name=$3 28 local netns=$2 29 local cmd="cat" 30 local msg=$1 31 32 [ -n "$netns" ] && cmd="ip netns exec $netns $cmd" 33 34 rps_mask=$($cmd /sys/class/net/$dev_name/queues/rx-0/rps_cpus) 35 printf "%-60s" "$msg" 36 37 # In case there is more than 32 CPUs we need to remove commas from masks 38 rps_mask=${rps_mask//,} 39 expected_rps_mask=${expected_rps_mask//,} 40 if [ $rps_mask -eq $expected_rps_mask ]; then 41 echo "[ ok ]" 42 else 43 echo "[fail] expected $expected_rps_mask found $rps_mask" 44 ret=1 45 fi 46} 47 48trap cleanup EXIT 49 50echo 0 > /proc/sys/net/core/rps_default_mask 51setup 52chk_rps "empty rps_default_mask" $NETNS lo 0 53cleanup 54 55echo 1 > /proc/sys/net/core/rps_default_mask 56setup 57chk_rps "changing rps_default_mask dont affect existing devices" "" lo $INITIAL_RPS_DEFAULT_MASK 58 59echo 3 > /proc/sys/net/core/rps_default_mask 60chk_rps "changing rps_default_mask dont affect existing netns" $NETNS lo 0 61 62ip link add name $VETH type veth peer netns $NETNS name $VETH 63ip link set dev $VETH up 64ip -n $NETNS link set dev $VETH up 65chk_rps "changing rps_default_mask affect newly created devices" "" $VETH 3 66chk_rps "changing rps_default_mask don't affect newly child netns[II]" $NETNS $VETH 0 67ip link del dev $VETH 68ip netns del $NETNS 69 70setup 71chk_rps "rps_default_mask is 0 by default in child netns" "$NETNS" lo 0 72 73ip netns exec $NETNS sysctl -qw net.core.rps_default_mask=1 74ip link add name $VETH type veth peer netns $NETNS name $VETH 75chk_rps "changing rps_default_mask in child ns don't affect the main one" "" lo $INITIAL_RPS_DEFAULT_MASK 76chk_rps "changing rps_default_mask in child ns affects new childns devices" $NETNS $VETH 1 77chk_rps "changing rps_default_mask in child ns don't affect existing devices" $NETNS lo 0 78 79exit $ret 80