tools/testing/selftests/net/setup_loopback.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 readonly FLUSH_PATH="/sys/class/net/${dev}/gro_flush_timeout"
   5 readonly IRQ_PATH="/sys/class/net/${dev}/napi_defer_hard_irqs"
   6 readonly FLUSH_TIMEOUT="$(< ${FLUSH_PATH})"
   7 readonly HARD_IRQS="$(< ${IRQ_PATH})"
   8
   9 netdev_check_for_carrier() {
  10         local -r dev="$1"
  11
  12         for i in {1..5}; do
  13                 carrier="$(cat /sys/class/net/${dev}/carrier)"
  14                 if [[ "${carrier}" -ne 1 ]] ; then
  15                         echo "carrier not ready yet..." >&2
  16                         sleep 1
  17                 else
  18                         echo "carrier ready" >&2
  19                         break
  20                 fi
  21         done
  22         echo "${carrier}"
  23 }
  24
  25 # Assumes that there is no existing ipvlan device on the physical device
  26 setup_loopback_environment() {
  27         local dev="$1"
  28
  29         # Fail hard if cannot turn on loopback mode for current NIC
  30         ethtool -K "${dev}" loopback on || exit 1
  31         sleep 1
  32
  33         # Check for the carrier
  34         carrier=$(netdev_check_for_carrier ${dev})
  35         if [[ "${carrier}" -ne 1 ]] ; then
  36                 echo "setup_loopback_environment failed"
  37                 exit 1
  38         fi
  39 }
  40
  41 setup_macvlan_ns(){
  42         local -r link_dev="$1"
  43         local -r ns_name="$2"
  44         local -r ns_dev="$3"
  45         local -r ns_mac="$4"
  46         local -r addr="$5"
  47
  48         ip link add link "${link_dev}" dev "${ns_dev}" \
  49                 address "${ns_mac}" type macvlan
  50         exit_code=$?
  51         if [[ "${exit_code}" -ne 0 ]]; then
  52                 echo "setup_macvlan_ns failed"
  53                 exit $exit_code
  54         fi
  55
  56         [[ -e /var/run/netns/"${ns_name}" ]] || ip netns add "${ns_name}"
  57         ip link set dev "${ns_dev}" netns "${ns_name}"
  58         ip -netns "${ns_name}" link set dev "${ns_dev}" up
  59         if [[ -n "${addr}" ]]; then
  60                 ip -netns "${ns_name}" addr add dev "${ns_dev}" "${addr}"
  61         fi
  62
  63         sleep 1
  64 }
  65
  66 cleanup_macvlan_ns(){
  67         while (( $# >= 2 )); do
  68                 ns_name="$1"
  69                 ns_dev="$2"
  70                 ip -netns "${ns_name}" link del dev "${ns_dev}"
  71                 ip netns del "${ns_name}"
  72                 shift 2
  73         done
  74 }
  75
  76 cleanup_loopback(){
  77         local -r dev="$1"
  78
  79         ethtool -K "${dev}" loopback off
  80         sleep 1
  81
  82         # Check for the carrier
  83         carrier=$(netdev_check_for_carrier ${dev})
  84         if [[ "${carrier}" -ne 1 ]] ; then
  85                 echo "setup_loopback_environment failed"
  86                 exit 1
  87         fi
  88 }
  89
  90 setup_interrupt() {
  91         # Use timer on  host to trigger the network stack
  92         # Also disable device interrupt to not depend on NIC interrupt
  93         # Reduce test flakiness caused by unexpected interrupts
  94         echo 100000 >"${FLUSH_PATH}"
  95         echo 50 >"${IRQ_PATH}"
  96 }
  97
  98 setup_ns() {
  99         # Set up server_ns namespace and client_ns namespace
 100         setup_macvlan_ns "${dev}" server_ns server "${SERVER_MAC}"
 101         setup_macvlan_ns "${dev}" client_ns client "${CLIENT_MAC}"
 102 }
 103
 104 cleanup_ns() {
 105         cleanup_macvlan_ns server_ns server client_ns client
 106 }
 107
 108 setup() {
 109         setup_loopback_environment "${dev}"
 110         setup_interrupt
 111 }
 112
 113 cleanup() {
 114         cleanup_loopback "${dev}"
 115
 116         echo "${FLUSH_TIMEOUT}" >"${FLUSH_PATH}"
 117         echo "${HARD_IRQS}" >"${IRQ_PATH}"
 118 }