tools/testing/selftests/net/rps_default_mask.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 readonly ksft_skip=4
   5 readonly cpus=$(nproc)
   6 ret=0
   7
   8 [ $cpus -gt 2 ] || exit $ksft_skip
   9
  10 readonly INITIAL_RPS_DEFAULT_MASK=$(cat /proc/sys/net/core/rps_default_mask)
  11 readonly TAG="$(mktemp -u XXXXXX)"
  12 readonly VETH="veth${TAG}"
  13 readonly NETNS="ns-${TAG}"
  14
  15 setup() {
  16         ip netns add "${NETNS}"
  17         ip -netns "${NETNS}" link set lo up
  18 }
  19
  20 cleanup() {
  21         echo $INITIAL_RPS_DEFAULT_MASK > /proc/sys/net/core/rps_default_mask
  22         ip netns del $NETNS
  23 }
  24
  25 chk_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
  48 trap cleanup EXIT
  49
  50 echo 0 > /proc/sys/net/core/rps_default_mask
  51 setup
  52 chk_rps "empty rps_default_mask" $NETNS lo 0
  53 cleanup
  54
  55 echo 1 > /proc/sys/net/core/rps_default_mask
  56 setup
  57 chk_rps "changing rps_default_mask dont affect existing devices" "" lo $INITIAL_RPS_DEFAULT_MASK
  58
  59 echo 3 > /proc/sys/net/core/rps_default_mask
  60 chk_rps "changing rps_default_mask dont affect existing netns" $NETNS lo 0
  61
  62 ip link add name $VETH type veth peer netns $NETNS name $VETH
  63 ip link set dev $VETH up
  64 ip -n $NETNS link set dev $VETH up
  65 chk_rps "changing rps_default_mask affect newly created devices" "" $VETH 3
  66 chk_rps "changing rps_default_mask don't affect newly child netns[II]" $NETNS $VETH 0
  67 ip link del dev $VETH
  68 ip netns del $NETNS
  69
  70 setup
  71 chk_rps "rps_default_mask is 0 by default in child netns" "$NETNS" lo 0
  72
  73 ip netns exec $NETNS sysctl -qw net.core.rps_default_mask=1
  74 ip link add name $VETH type veth peer netns $NETNS name $VETH
  75 chk_rps "changing rps_default_mask in child ns don't affect the main one" "" lo $INITIAL_RPS_DEFAULT_MASK
  76 chk_rps "changing rps_default_mask in child ns affects new childns devices" $NETNS $VETH 1
  77 chk_rps "changing rps_default_mask in child ns don't affect existing devices" $NETNS lo 0
  78
  79 exit $ret