name : setup_loopback.sh #!/bin/bash # SPDX-License-Identifier: GPL-2.0 readonly FLUSH_PATH="/sys/class/net/${dev}/gro_flush_timeout" readonly IRQ_PATH="/sys/class/net/${dev}/napi_defer_hard_irqs" readonly FLUSH_TIMEOUT="$(< ${FLUSH_PATH})" readonly HARD_IRQS="$(< ${IRQ_PATH})" readonly server_ns=$(mktemp -u server-XXXXXXXX) readonly client_ns=$(mktemp -u client-XXXXXXXX) netdev_check_for_carrier() { local -r dev="$1" for i in {1..5}; do carrier="$(cat /sys/class/net/${dev}/carrier)" if [[ "${carrier}" -ne 1 ]] ; then echo "carrier not ready yet..." >&2 sleep 1 else echo "carrier ready" >&2 break fi done echo "${carrier}" } # Assumes that there is no existing ipvlan device on the physical device setup_loopback_environment() { local dev="$1" # Fail hard if cannot turn on loopback mode for current NIC ethtool -K "${dev}" loopback on || exit 1 sleep 1 # Check for the carrier carrier=$(netdev_check_for_carrier ${dev}) if [[ "${carrier}" -ne 1 ]] ; then echo "setup_loopback_environment failed" exit 1 fi } setup_macvlan_ns(){ local -r link_dev="$1" local -r ns_name="$2" local -r ns_dev="$3" local -r ns_mac="$4" local -r addr="$5" ip link add link "${link_dev}" dev "${ns_dev}" \ address "${ns_mac}" type macvlan exit_code=$? if [[ "${exit_code}" -ne 0 ]]; then echo "setup_macvlan_ns failed" exit $exit_code fi [[ -e /var/run/netns/"${ns_name}" ]] || ip netns add "${ns_name}" ip link set dev "${ns_dev}" netns "${ns_name}" ip -netns "${ns_name}" link set dev "${ns_dev}" up if [[ -n "${addr}" ]]; then ip -netns "${ns_name}" addr add dev "${ns_dev}" "${addr}" fi sleep 1 } cleanup_macvlan_ns(){ while (( $# >= 2 )); do ns_name="$1" ns_dev="$2" ip -netns "${ns_name}" link del dev "${ns_dev}" ip netns del "${ns_name}" shift 2 done } cleanup_loopback(){ local -r dev="$1" ethtool -K "${dev}" loopback off sleep 1 # Check for the carrier carrier=$(netdev_check_for_carrier ${dev}) if [[ "${carrier}" -ne 1 ]] ; then echo "setup_loopback_environment failed" exit 1 fi } setup_interrupt() { # Use timer on host to trigger the network stack # Also disable device interrupt to not depend on NIC interrupt # Reduce test flakiness caused by unexpected interrupts echo 100000 >"${FLUSH_PATH}" echo 50 >"${IRQ_PATH}" } setup_ns() { # Set up server_ns namespace and client_ns namespace setup_macvlan_ns "${dev}" ${server_ns} server "${SERVER_MAC}" setup_macvlan_ns "${dev}" ${client_ns} client "${CLIENT_MAC}" } cleanup_ns() { cleanup_macvlan_ns ${server_ns} server ${client_ns} client } setup() { setup_loopback_environment "${dev}" setup_interrupt } cleanup() { cleanup_loopback "${dev}" echo "${FLUSH_TIMEOUT}" >"${FLUSH_PATH}" echo "${HARD_IRQS}" >"${IRQ_PATH}" }